CN109727752B

CN109727752B - Natural ester insulating oil distribution transformer

Info

Publication number: CN109727752B
Application number: CN201910076313.8A
Authority: CN
Inventors: 陈顺平; 何建权; 黄良煜
Original assignee: Rongzhong Electrical Co ltd
Current assignee: Rongzhong Electrical Co ltd
Priority date: 2019-01-26
Filing date: 2019-01-26
Publication date: 2020-07-14
Anticipated expiration: 2039-01-26
Also published as: CN109727752A

Abstract

If the coil is damaged, a worker firstly guides natural ester in a main box body into an auxiliary box body through an oil guide opening on site, then opens the main box body, detaches an upper low-voltage connecting piece and a lower low-voltage connecting piece, removes an upper core beam, sequentially screws down abutting nuts if a first-phase coil is damaged, removes a first upper mounting seat, removes the damaged high-voltage coil or low-voltage coil, inserts a lower end wire joint of a new high-voltage coil or low-voltage coil into a corresponding mounting groove in a matching mode and correspondingly contacts with a corresponding joint to realize electric connection, then inserts an upper end wire joint of the high-voltage coil or low-voltage coil into the corresponding mounting groove in a matching mode and correspondingly contacts with the corresponding joint to realize electric connection, and then locks the first abutting nut. The natural ester is injected into the main box body again and then works normally. The invention has good insulation effect, convenient and flexible disassembly, assembly and maintenance and obviously reduced cost.

Description

Natural ester insulating oil distribution transformer

Technical Field

The invention relates to the field of high-voltage transmission equipment, in particular to a natural ester insulating oil distribution transformer.

Background

Since the transformer invented by Nigla Tesla, the function, structure and material changes of the transformer are few, the transformer is designed around the voltage increase and decrease of electricity all the time, and the problem that the transformer and the material thereof have negative influence on the environment is rarely considered, and the revolutionary change of the transformer does not occur in the design concept until the green transformer represented by a natural ester insulation transformer appears in the 80 s of the 20 th century, namely the transformer is used for increasing and decreasing the voltage with high efficiency, and the transformer is also required to be environment-friendly, so that the green transformer appears in the true sense.

Before the advent of green transformers such as natural ester insulation transformers, distribution transformers were generally classified into oil-immersed (using mineral oil) and dry (using epoxy resin) types. Oil-immersed transformers are used in 95% of the power grid field in China, and oil-immersed transformers are used in more than 60% of the industrial field. The two transformers (oil-immersed type and dry type) have the characteristics of simple production process, mature technology, strong overload capacity, low price and the like, but the two transformers have larger environmental influence (for example, mineral oil pollutes soil and water and is difficult to naturally degrade, epoxy resin cannot be degraded, dust is generated by mechanical crushing and also a large amount of energy is consumed) by the currently applied insulating materials, and the two transformers represent the typical forms of the past transformers and also represent the design concept of people in the industrial age, namely the characteristics of pursuing the economy, the functionality and the mass production of industrial products and neglect the influence on the environment.

The structure of a natural ester transformer is known, for example, chinese utility model patent CN 201721294816.5 discloses a natural ester insulating oil distribution transformer, including oil tank, iron core, high-voltage coil, low-voltage coil, high-voltage bushing, low-voltage bushing, oil level gauge and tap changer, the oil tank be ellipsoid shape, high-voltage coil and low-voltage coil closely twine respectively on the iron core, the iron core soaks in the natural ester insulating oil in the oil tank, install high-voltage bushing and low-voltage bushing on the outer surface of oil tank top, high-voltage bushing and low-voltage bushing are connected with high-voltage coil and low-voltage coil respectively, in the oil level gauge was installed and extended to natural ester insulating oil to one side at oil tank top, tap changer set up the oil tank top in the middle of high-voltage bushing and low-voltage bushing, the opposite side at oil tank top was provided with the oiling valve. The oil tank wall of the oil tank is arranged to be of a corrugated wall structure, and the corrugated wall structure is used for increasing the elasticity of the oil tank wall. The two sides corresponding to the long axis of the ellipsoidal oil tank are respectively provided with a radiator which is composed of a plurality of rectangular radiating fins arranged at equal intervals. Round bulges or spiral fins are uniformly embedded on the radiating fins. The outer surface of the oil tank is coated with a carbon nano modification-based resin-based heat dissipation coating, and the thickness of the heat dissipation coating is 40-50 mu m. The outer surface of the radiating fin is coated with a carbon nano modification-based resin-based radiating coating, and the thickness of the radiating coating is 40-50 microns. One side of oil tank is provided with the hydrologic cycle radiator, and the hydrologic cycle radiator is including advancing oil pipe, defeated oil pipe, play oil pipe, storage water tank and hydrologic cycle mechanism, advances oil pipe and goes out oil pipe and is connected with oiling valve and fuel outlet valve respectively, advances to be provided with the oil pump on the oil pipe, and the storage water tank suit is on defeated oil pipe, and the water inlet setting of hydrologic cycle mechanism is in the storage water tank bottom, and the delivery port setting is at the storage water tank. The oil delivery pipe in the water circulation radiator is arranged in a spiral or double spiral shape. The oil outlet pipe is provided with a moisture absorber.

The energy efficiency grade of the transformer is improved to a certain extent, but in actual conditions, when a coil and the like are broken down and damaged, the coil needs to be returned to a factory for maintenance or the whole transformer needs to be replaced, so that the cost is high and the transformer is very troublesome; but also causes dangerous situations such as short circuits, fires, etc. due to impurities, bubbles, etc. remaining in the natural ester.

Accordingly, the present inventors have made extensive studies to solve the above problems and have made the present invention.

Disclosure of Invention

The invention aims to provide a natural ester insulating oil distribution transformer which is convenient and flexible to disassemble, assemble and maintain and remarkably reduces the cost on the basis of ensuring the insulating effect.

In order to achieve the purpose, the invention adopts the following technical scheme:

a natural ester insulating oil distribution transformer comprises a main box body, a transformation main body and natural ester which are arranged in the main box body, a radiator arranged outside the main box body and an oil purifier for filtering the natural ester; the main box body is provided with an oil guide port; the transformation main body comprises a three-phase iron core, and a first phase coil, a second phase coil and a third phase coil which are sleeved on the three-phase iron core; the three-phase iron core comprises a first-phase core column, a second-phase core column and a third-phase core column which are vertically arranged, an upper core beam and a lower core beam, wherein the upper core beam is horizontally connected among the upper ends of the first-phase core column, the upper ends of the second-phase core column and the upper end of the third-phase core column, and the lower core beam is horizontally connected among the lower ends of the first-phase core column, the lower ends of the second-phase core column; the second-phase core column is connected between the middle parts of the upper core beam and the lower core beam; the first phase coil comprises a first low-voltage coil sleeved outside the first phase core column, a first high-voltage coil sleeved outside the first low-voltage coil, a first lower mounting seat connected to the lower ends of the first low-voltage coil and the first high-voltage coil, a first upper mounting seat connected to the upper ends of the first low-voltage coil and the first high-voltage coil, and a first locking device for locking the first low-voltage coil and the first high-voltage coil;

the first lower mounting seat comprises a first lower connecting ring sleeved outside the first-phase core column and connected with the first-phase core column, a first lower mounting disc sleeved outside the first lower connecting ring, a first lower connecting block connected between the first lower connecting ring and the first lower mounting disc, a first lower low-voltage connector electrically connected with a lower end wire connector of the first low-voltage coil, and a first lower high-voltage connector electrically connected with a lower end wire connector of the first high-voltage coil; the first lower mounting plate is provided with a first lower low-voltage mounting groove for inserting the lower end of the first low-voltage coil and a first lower high-voltage mounting groove for inserting the lower end of the first high-voltage coil; a first lower gap for natural ester to flow through is formed between the adjacent first lower connecting blocks;

the first upper mounting seat comprises a first upper connecting ring sleeved outside the first phase core column, a first upper mounting disc sleeved outside the first upper connecting ring, a first upper connecting block connected between the first upper connecting ring and the first upper mounting disc, a first upper low-voltage connector electrically connected with an upper end wire connector of the first low-voltage coil, and a first upper high-voltage connector electrically connected with an upper end wire connector of the first high-voltage coil; the first upper mounting plate is provided with a first upper low-voltage mounting groove for inserting the upper end of the first low-voltage coil and a first upper high-voltage mounting groove for inserting the lower end of the first high-voltage coil; a first upper gap for natural ester to flow through is formed between the adjacent first upper connecting blocks; the first upper connecting ring is provided with a first sleeve hole sleeved on the first phase core column;

the first locking device comprises a first fixed threaded sleeve fixedly sleeved on the first phase core column and a first abutting nut matched with the first fixed threaded sleeve and abutting against the first upper connecting ring downwards; the peripheral surface of the first fixed threaded sleeve is provided with an external thread which is in threaded fit with the first abutting nut;

the second phase coil comprises a second low-voltage coil sleeved outside the second phase core column, a second high-voltage coil sleeved outside the second low-voltage coil, a second lower mounting seat connected to the lower ends of the second low-voltage coil and the second high-voltage coil, a second upper mounting seat connected to the upper ends of the second low-voltage coil and the second high-voltage coil, and a second locking device for locking the second low-voltage coil and the second high-voltage coil;

the second lower mounting seat comprises a second lower connecting ring sleeved outside the second phase core column and connected with the second phase core column together, a second lower mounting disc sleeved outside the second lower connecting ring, a second lower connecting block connected between the second lower connecting ring and the second lower mounting disc, a second lower low-voltage connector electrically connected with a lower end wire connector of the second low-voltage coil, and a second lower high-voltage connector electrically connected with a lower end wire connector of the second high-voltage coil; the second lower mounting plate is provided with a second lower low-voltage mounting groove for inserting the lower end of the second low-voltage coil and a second lower high-voltage mounting groove for inserting the lower end of the second high-voltage coil; a second lower gap for natural ester to flow through is formed between the adjacent second lower connecting blocks;

the second upper mounting seat comprises a second upper connecting ring sleeved outside the second phase core column, a second upper mounting disc sleeved outside the second upper connecting ring, a second upper connecting block connected between the second upper connecting ring and the second upper mounting disc, a second upper low-voltage joint electrically connected with an upper end wire joint of the second low-voltage coil, and a second upper high-voltage joint electrically connected with an upper end wire joint of the second high-voltage coil; the second upper mounting plate is provided with a second upper low-voltage mounting groove for inserting the upper end of the second low-voltage coil and a second upper high-voltage mounting groove for inserting the lower end of the second high-voltage coil; a second upper gap for natural ester to flow through is formed between the adjacent second upper connecting blocks; the second upper connecting ring is provided with a second trepanning hole which is sleeved on the second phase core column;

the second locking device comprises a second fixed threaded sleeve fixedly sleeved on the second phase core column and a second abutting nut matched with the second fixed threaded sleeve and abutting against the second upper connecting ring downwards; the peripheral surface of the second fixed threaded sleeve is provided with an external thread which is in threaded fit with the second abutting nut;

the third phase coil comprises a third low-voltage coil sleeved outside the third phase core column, a third high-voltage coil sleeved outside the third low-voltage coil, a third lower mounting seat connected to the lower ends of the third low-voltage coil and the third high-voltage coil, a third upper mounting seat connected to the upper ends of the third low-voltage coil and the third high-voltage coil, and a third locking device for locking the third low-voltage coil and the third high-voltage coil;

the third lower mounting seat comprises a third lower connecting ring sleeved outside the third phase core column and connected with the third phase core column, a third lower mounting disc sleeved outside the third lower connecting ring, a third lower connecting block connected between the third lower connecting ring and the third lower mounting disc, a third lower low-voltage joint electrically connected with a lower end wire joint of the third low-voltage coil, and a third lower high-voltage joint electrically connected with a lower end wire joint of the third high-voltage coil; the third lower mounting plate is provided with a third lower low-voltage mounting groove for inserting the lower end of the third low-voltage coil and a third lower high-voltage mounting groove for inserting the lower end of the third high-voltage coil; a third lower gap for natural ester to flow through is formed between the adjacent third lower connecting blocks;

the third upper mounting base comprises a third upper connecting ring sleeved outside the third phase core column, a third upper mounting disc sleeved outside the third upper connecting ring, a third upper connecting block connected between the third upper connecting ring and the third upper mounting disc, a third upper low-voltage joint electrically connected with an upper end wire joint of the third low-voltage coil, and a third upper high-voltage joint electrically connected with an upper end wire joint of the third high-voltage coil; the third upper mounting plate is formed with a third upper low-voltage mounting groove into which the upper end of the third low-voltage coil is inserted, and a third upper high-voltage mounting groove into which the lower end of the third high-voltage coil is inserted; a third upper gap for natural ester to flow through is formed between the adjacent third upper connecting blocks; the third upper connecting ring is provided with a third sleeve hole sleeved on the third phase core column;

the third locking device comprises a third fixed threaded sleeve fixedly sleeved on the third phase core column and a third abutting nut which is matched with the third fixed threaded sleeve and abuts against the third upper connecting ring downwards; the peripheral surface of the third fixed threaded sleeve is provided with an external thread which is in threaded fit with the third abutting nut;

the upper core beam and the first phase core column, the second phase core column and the third phase core column are of split structures, and the upper core beam and the first phase core column, the second phase core column and the third phase core column are connected together through a connecting mechanism; the upper core beam is provided with a first connecting part connected with the upper end of the first phase core column, a second connecting part connected with the upper end of the second phase core column and a third connecting part connected with the upper end of the third phase core column; a first lower connecting inclined plane which is inclined towards the third phase core column from top to bottom is formed at the upper end of the first phase core column, and a plurality of first lower wavy grains are formed on the first lower connecting inclined plane; the first connecting part is provided with a first upper connecting inclined plane corresponding to the first lower connecting inclined plane, and the first upper connecting inclined plane is provided with a plurality of first upper raised grains which are matched and meshed with the first lower raised grains; a conical tip is formed at the upper end of the second-phase core column, and the conical tip comprises a first lower conical inclined surface which is inclined towards the first-phase core column from top to bottom gradually and a second lower conical inclined surface which is inclined towards the third-phase core column from top to bottom gradually; a plurality of second lower raised grains are formed on the first lower cone inclined plane and the second lower cone inclined plane; the second connecting part is provided with a conical groove matched with the conical tip, and the conical groove comprises a first upper conical inclined surface corresponding to the first lower conical inclined surface and a second upper conical inclined surface corresponding to the second lower conical inclined surface; a plurality of second upper raised grains matched and meshed with the second lower raised grains are formed on the first upper conical inclined plane and the second upper conical inclined plane;

a third lower connecting inclined plane which is inclined towards the first-phase core column from top to bottom is formed at the upper end of the third-phase core column, and a plurality of third lower raised grains are formed on the third lower connecting inclined plane; a third upper connecting inclined plane corresponding to the third lower connecting inclined plane is formed on the third connecting part, and a plurality of third upper raised grains matched and meshed with the third lower raised grains are formed on the third upper connecting inclined plane;

the connecting mechanism comprises connecting caps which are wrapped at the upper ends of the upper core beam, the first-phase core column and the third-phase core column, a first connecting part which is positioned between the first-phase core column and the second-phase core column and used for locking the connecting caps, and a second connecting part which is positioned between the third-phase core column and the second-phase core column and used for locking the connecting caps;

the first connection parts include a first upper connection part which downwardly pockets the connection cap, a first lower connection part which upwardly pockets the lower core beam, and a first connection bolt which connects the first upper connection part and the first lower connection part; the first upper connecting piece comprises a first upper horizontal limiting plate parallel to and corresponding to the upper surface of the upper core beam, two first upper vertical limiting plates parallel to and corresponding to the two side surfaces of the upper core beam, and two first upper fixing plates connected to the lower edges of the two first upper vertical limiting plates; the two first upper fixing plates are horizontally arranged and are vertically connected with the two first upper vertical limiting plates in a one-to-one corresponding mode; the first lower connecting piece comprises a first lower horizontal limiting plate parallel to and corresponding to the lower surface of the lower core beam, two first lower vertical limiting plates parallel to and corresponding to the two side surfaces of the lower core beam and extending upwards, and two first lower locking plates connected to the upper edges of the two first lower vertical limiting plates; the two first lower locking plates are horizontally arranged and are correspondingly arranged below the two first upper locking plates one by one; the first connecting bolt penetrates through the corresponding first upper locking plate and the corresponding first lower locking plate to be locked;

the second connecting part comprises a second upper connecting part which downwards wraps the connecting cap, a second lower connecting part which upwards wraps the lower core beam, and a second connecting bolt which connects the second upper connecting part and the second lower connecting part; the second upper connecting piece comprises a second upper horizontal limiting plate parallel to and corresponding to the upper surface of the upper core beam, two second upper vertical limiting plates parallel to and corresponding to the two side surfaces of the upper core beam, and two second upper fixing plates connected to the lower edges of the two second upper vertical limiting plates; the two second upper vertical limiting plates are correspondingly and vertically connected with the two second upper fixing plates one by one; the second lower connecting piece comprises a second lower horizontal limiting plate parallel to and corresponding to the lower surface of the lower core beam, two second lower vertical limiting plates parallel to and corresponding to the two side surfaces of the lower core beam and extending upwards, and two second lower locking plates connected to the upper edges of the two second lower vertical limiting plates; the two second lower locking plates are horizontally arranged and are correspondingly arranged below the two second upper locking plates one by one; the second connecting bolt penetrates through the corresponding second upper locking plate and the second lower locking plate to be locked.

The oil purifier comprises a cylindrical shell which is vertically arranged, an adsorption part which is arranged in the shell, an oil inlet pipe and an oil outlet pipe which are communicated between the shell and the main box body, an oil inlet power device which is arranged on the oil inlet pipe, an oil outlet power device which is arranged on the oil outlet pipe and a bubble extraction device; the shell is provided with an oil inlet communicated with the oil inlet pipe and an oil outlet communicated with the oil outlet pipe; the oil inlet is positioned above the adsorption part, and the oil outlet is positioned below the adsorption part; the oil inlet pipe is at least provided with an oil inlet elastic pipe section corresponding to the oil inlet power device, and the oil outlet pipe is at least provided with an oil outlet elastic pipe section corresponding to the oil outlet power device;

the oil inlet power device comprises an oil inlet bearing groove seat for bearing the oil inlet elastic pipe section, an oil inlet rolling wheel for circularly rolling the oil inlet elastic pipe section, an oil inlet transmission shaft for driving the oil inlet rolling wheel to rotate, and an oil inlet driving motor for driving the oil inlet transmission shaft to rotate; the oil inlet bearing groove seat is provided with an oil inlet arc-shaped groove for accommodating the oil inlet elastic pipe section, and the axis of the oil inlet transmission shaft penetrates through the circle center of the oil inlet arc-shaped groove; the oil inlet rolling wheel comprises a plurality of oil inlet rolling rods extending along the radial direction of the oil inlet transmission shaft and a plurality of oil inlet rolling rollers arranged at the end parts of the oil inlet rolling rods in a one-to-one correspondence manner; each oil inlet roller press roller circularly enters the oil inlet circular arc groove to roll the oil inlet elastic pipe section; each oil inlet roller pressing roller is parallel to the oil inlet transmission shaft; the oil outlet power device comprises an oil outlet bearing groove seat for bearing the oil outlet elastic pipe section, an oil outlet rolling wheel for circularly rolling the oil outlet elastic pipe section, an oil outlet transmission shaft for driving the oil outlet rolling wheel to rotate, and an oil outlet driving motor for driving the oil outlet transmission shaft to rotate; the oil outlet bearing groove seat is provided with an oil outlet circular arc groove for accommodating the oil outlet elastic pipe section, and the axis of the oil outlet transmission shaft penetrates through the circle center of the oil outlet circular arc groove; the oil outlet rolling wheel comprises a plurality of oil outlet rolling rods extending along the radial direction of the oil outlet transmission shaft and a plurality of oil outlet rolling rollers arranged at the end parts of the oil outlet rolling rods in a one-to-one correspondence manner; each oil outlet roller circularly enters the oil outlet circular arc groove to roll the oil outlet elastic pipe section; each oil outlet roller is parallel to the oil outlet transmission shaft;

the air bubble extraction device comprises a piston which is arranged in the shell in a sealing sliding mode, a piston rod which drives the piston to move up and down and penetrates through the upper end of the shell, a lifting driving device which drives the piston rod to move up and down, and an exhaust mechanism which exhausts air; a first through hole for the piston rod to penetrate through is formed at the upper end of the shell, and a second through hole penetrating up and down is formed in the piston; the exhaust mechanism comprises a sealing baffle arranged in the shell, a first one-way valve arranged on the sealing baffle and used for ventilating upwards, and a second one-way valve arranged in the second through hole and used for ventilating upwards; a third through hole for installing the first one-way valve is formed in the sealing baffle, and an exhaust hole is formed in the upper end of the shell; the sealing baffle is positioned below the piston and above the oil inlet.

The lifting driving device comprises a transmission plate connected with the upper end of the piston rod, a screw rod for driving the transmission plate to move up and down, and a lifting driving motor for driving the screw rod to rotate; the transmission plate is provided with a screw hole matched with the screw rod.

The first lower low-voltage connector comprises a first lower inner low-voltage connector, a first lower outer low-voltage connector and a first lower low-voltage connecting wire, wherein the first lower inner low-voltage connector is arranged in the first lower low-voltage mounting groove and is in direct electrical contact with a lower end wire connector of the first low-voltage coil; the first upper low-voltage connector comprises a first upper inner low-voltage connector, a first upper outer low-voltage connector and a first upper low-voltage connecting wire, wherein the first upper inner low-voltage connector is arranged in the first upper low-voltage mounting groove and is in direct electrical contact with an upper end wire connector of the first low-voltage coil;

the first lower high-voltage connector comprises a first lower inner high-voltage connector, a first lower outer high-voltage connector and a first lower high-voltage connecting wire, wherein the first lower inner high-voltage connector is arranged in the first lower high-voltage mounting groove and is in direct electrical contact with a lower end wire connector of the first high-voltage coil; the first upper high-voltage connector comprises a first upper inner high-voltage connector, a first upper outer high-voltage connector and a first upper high-voltage connecting wire, wherein the first upper inner high-voltage connector is arranged in the first upper high-voltage mounting groove and is in direct electrical contact with an upper end wire connector of the first high-voltage coil;

the second lower low-voltage connector comprises a second lower inner low-voltage connector, a second lower outer low-voltage connector and a second lower low-voltage connecting wire, wherein the second lower inner low-voltage connector is arranged in the second lower low-voltage mounting groove and is in direct electrical contact with the lower end wire connector of the second low-voltage coil; the second upper low-voltage connector comprises a second upper inner low-voltage connector, a second upper outer low-voltage connector and a second upper low-voltage connecting wire, wherein the second upper inner low-voltage connector is arranged in the second upper low-voltage mounting groove and is in direct electrical contact with the upper end wire connector of the second low-voltage coil;

the second lower high-voltage connector comprises a second lower inner high-voltage connector, a second lower outer high-voltage connector and a second lower high-voltage connecting wire, wherein the second lower inner high-voltage connector is arranged in the second lower high-voltage mounting groove and is in direct electrical contact with the lower end wire connector of the second high-voltage coil; the second upper high-voltage connector comprises a second upper inner high-voltage connector, a second upper outer high-voltage connector and a second upper high-voltage connecting wire, wherein the second upper inner high-voltage connector is arranged in the second upper high-voltage mounting groove and is in direct electrical contact with an upper end wire connector of the second high-voltage coil;

the third lower low-voltage connector comprises a third lower inner low-voltage connector, a third lower outer low-voltage connector and a third lower low-voltage connecting wire, wherein the third lower inner low-voltage connector is arranged in the third lower low-voltage mounting groove and is in direct electrical contact with a lower end wire connector of the third low-voltage coil; the third upper low-voltage connector comprises a third upper inner low-voltage connector, a third upper outer low-voltage connector and a third upper low-voltage connecting wire, wherein the third upper inner low-voltage connector is arranged in the third upper low-voltage mounting groove and is in direct electrical contact with the upper end wire connector of the third low-voltage coil;

the third lower high-voltage connector comprises a third lower inner high-voltage connector, a third lower outer high-voltage connector and a third lower high-voltage connecting wire, wherein the third lower inner high-voltage connector is arranged in the third lower high-voltage mounting groove and is in direct electrical contact with the lower end wire connector of the third high-voltage coil; the third high-voltage connector comprises a third upper inner high-voltage connector, a third upper outer high-voltage connector and a third upper high-voltage connecting wire, wherein the third upper inner high-voltage connector is arranged in the third upper high-voltage mounting groove and is in direct electrical contact with an upper end wire connector of the third high-voltage coil, the third upper outer high-voltage connector is arranged outside the third upper mounting plate and is connected with a high-voltage wire, and the third upper high-voltage connecting wire is embedded in the third upper mounting plate and is connected between the third upper inner high-voltage connector and the third upper outer high-voltage connector.

The auxiliary box body is communicated with the oil guide port, the oil guide pipe is connected between the oil guide port and the auxiliary box body, and the oil guide power device is arranged on the oil guide pipe; the oil guide pipe is at least provided with an oil guide elastic pipe section corresponding to the oil guide power device; the oil guide power device comprises an oil guide bearing groove seat for bearing the oil guide elastic pipe section, an oil guide roller pressing wheel for circularly rolling the oil guide elastic pipe section, an oil guide transmission shaft for driving the oil guide roller pressing wheel to rotate, and an oil guide driving motor for driving the oil guide transmission shaft to rotate; the oil guide bearing groove seat is provided with an oil guide circular arc groove for accommodating the oil guide elastic pipe section, the axis of the oil guide transmission shaft penetrates through the circle center of the oil guide circular arc groove, and each oil guide roller circularly enters the oil guide circular arc groove to roll the oil guide elastic pipe section; the oil guide rolling wheel comprises a plurality of oil guide rolling rods extending along the radial direction of the oil guide transmission shaft and a plurality of oil guide rolling rollers arranged at the end parts of the oil guide rolling rods in a one-to-one correspondence manner; and each oil guide roller is parallel to the oil guide transmission shaft.

After the technical scheme is adopted, the natural ester insulating oil distribution transformer breaks through the structural form of the traditional natural ester transformer, in the actual working process, when the first low-voltage coil, the first high-voltage coil, the second low-voltage coil, the second high-voltage coil, the third low-voltage coil or the third high-voltage coil is broken through current breakdown, a worker can directly operate on site, firstly, natural ester in the main box body is led out to the auxiliary box body through the oil guide opening, then, the main box body is opened, the first connecting bolt and the second connecting bolt are operated, the first upper connecting piece and the first lower connecting piece as well as the second upper connecting piece and the second lower connecting piece are disassembled, the connecting cap is disassembled, then, the upper core beam is taken down from the first phase core column, the second phase core column and the third phase core column, if the first low-voltage coil or the first high-voltage coil is damaged, the first abutting nut is screwed down from the first fixing threaded sleeve, then the first upper mounting seat is taken down upwards, then the damaged first low-voltage coil or first high-voltage coil is taken down upwards, a new first low-voltage coil or first high-voltage coil is sleeved on the first phase core column and moves downwards, the lower end of the first low-voltage coil or first high-voltage coil is inserted into the first lower low-voltage mounting groove or the first lower high-voltage mounting groove of the first lower mounting seat in a matching manner, the lower end wire connector of the first low-voltage coil is correspondingly contacted with the first lower low-voltage connector in the first lower low-voltage mounting groove to realize electric connection, the lower end wire connector of the first high-voltage coil is correspondingly contacted with the first lower high-voltage connector in the first lower high-voltage mounting groove to realize electric connection, then the first upper mounting seat is sleeved on the first phase core column and moves downwards, the upper end of the first low-voltage coil or first high-voltage coil is inserted into the first upper low-voltage mounting groove or first high-voltage mounting groove of the first upper mounting seat in a matching manner, the upper end wire joint of the first low-voltage coil is correspondingly contacted with the first upper low-voltage joint in the first upper low-voltage mounting groove to realize electric connection, the upper end wire joint of the first high-voltage coil is correspondingly contacted with the first upper high-voltage joint in the first upper high-voltage mounting groove to realize electric connection, then the first abutting nut is sleeved on the first fixing threaded sleeve to rotate downwards and abut against the first upper mounting seat downwards, the first upper mounting seat is matched with the first lower mounting seat to clamp and fix the first low-voltage coil and the first high-voltage coil, the upper end wire joint and the lower end wire joint of the first low-voltage coil are respectively kept in stable electric connection with the first upper low-voltage joint and the first lower low-voltage joint, and the upper end wire joint and the lower end wire joint of the first high-voltage coil are respectively kept in stable electric connection with the first upper high-voltage joint and the first lower high-voltage joint; then, placing the upper core beam on the first-phase core column, the second-phase core column and the third-phase core column, enabling the first lower connecting inclined plane to correspond to the first upper connecting inclined plane, and enabling the first lower raised grains to be matched and meshed with the first upper raised grains to achieve magnetic conductivity communication; the first lower cone inclined plane corresponds to the first upper cone inclined plane, the second lower cone inclined plane corresponds to the second upper cone inclined plane, and each second lower raised grain is matched and meshed with each corresponding second upper raised grain to realize magnetic communication; the third lower connecting inclined plane corresponds to the third upper connecting inclined plane, and the third lower raised grains are matched and meshed with the third upper raised grains to realize the magnetic conductivity communication; and then, the first upper connecting piece and the first lower connecting piece, and the second upper connecting piece and the second lower connecting piece are respectively and correspondingly locked by utilizing the first connecting bolt and the second connecting bolt, so that the upper core beam, the first-phase core column, the second-phase core column and the third-phase core column are stably and magnetically communicated, the three-phase iron core is closed, and then natural ester is injected into the main box body again, and the transformer can normally work after being re-sealed and adjusted. If the second phase coil and the third phase coil are damaged, the principle is similar to the principle. Compared with the prior art, the natural ester insulating oil distribution transformer effectively utilizes the insulating property of natural ester, is convenient and flexible to disassemble, assemble and maintain on the basis of ensuring the insulating effect, and obviously reduces the cost.

Drawings

FIG. 1 is a first partial cross-sectional structural schematic view of the present invention;

FIG. 2 is a second partial cross-sectional structural schematic of the present invention;

fig. 3 is a third partial sectional structural view of the present invention.

Detailed Description

In order to further explain the technical solution of the present invention, the following detailed description is given by way of specific examples.

The invention discloses a natural ester insulating oil distribution transformer, which comprises a main box body 1, a transformation main body 2 and natural ester which are arranged in the main box body 1, a radiator arranged outside the main box body 1 and an oil purifier for filtering the natural ester, wherein the radiator is arranged on the outer side of the main box body 1; preferably, the main tank 1 has an oil guide port; preferably, the transformation body 2 comprises a three-phase iron core, and a first phase coil 22, a second phase coil 23 and a third phase coil 24 sleeved on the three-phase iron core; the three-phase iron core comprises a first phase core column 211, a second phase core column 212 and a third phase core column 213 which are vertically arranged, an upper core beam 214 which is horizontally connected among the upper ends of the first phase core column 211, the second phase core column 212 and the third phase core column 213, and a lower core beam 215 which is horizontally connected among the lower ends of the first phase core column 211, the second phase core column 212 and the third phase core column 213; the second phase leg 212 is connected between the upper beam 214 and the middle of the lower beam 215; the first phase coil 22 includes a first low voltage coil 221 sleeved outside the first phase leg 211, a first high voltage coil 222 sleeved outside the first low voltage coil 221, a first lower mounting seat connected to the lower ends of the first low voltage coil 221 and the first high voltage coil 222, a first upper mounting seat connected to the upper ends of the first low voltage coil 221 and the first high voltage coil 222, and a first locking device 225 for locking the first low voltage coil 221 and the first high voltage coil 222;

preferably, the first lower mount includes a first lower connection ring 2231 sleeved outside the first phase leg 211 and connected to the first phase leg 211, a first lower mounting plate 2232 sleeved outside the first lower connection ring 2231, a first lower connection block connected between the first lower connection ring 2231 and the first lower mounting plate 2232, a first lower low voltage terminal electrically connected to a lower terminal of the first low voltage coil 221, and a first lower high voltage terminal 22351 electrically connected to a lower terminal of the first high voltage coil 222; the first lower mounting plate 2232 is formed with a first lower low voltage mounting groove 22321 into which the lower end of the first low voltage coil 221 is inserted, and a first lower high voltage mounting groove 22322 into which the lower end of the first high voltage coil 222 is inserted; a first lower gap for natural ester to flow through is formed between the adjacent first lower connecting blocks;

preferably, the first upper mount includes a first upper connection ring 2241 fitted over the first phase leg 211, a first upper mounting plate 2242 fitted over the first upper connection ring 2241, a first upper connection block connected between the first upper connection ring 2241 and the first upper mounting plate 2242, a first upper low-voltage terminal electrically connected to the upper terminal connector of the first low-voltage coil 221, and a first upper high-voltage terminal electrically connected to the upper terminal connector of the first high-voltage coil 222; the first upper mounting plate 2242 is formed with a first upper low voltage mounting groove 22421 into which the upper end of the first low voltage coil 221 is inserted, and a first upper high voltage mounting groove 22422 into which the lower end of the first high voltage coil 222 is inserted; a first upper gap for natural ester to flow through is formed between the adjacent first upper connecting blocks; the first upper connecting ring 2241 is formed with a first sleeve hole sleeved on the first phase column 211;

preferably, the first locking device 225 comprises a first fixing threaded sleeve 2251 fixedly sleeved on the first phase stem 211, and a first abutting nut which is matched with the first fixing threaded sleeve 2251 and abuts against the first upper connecting ring 2241 downward; the peripheral surface of the first fixing thread bushing 2251 is formed with an external thread that is in threaded engagement with the first butting nut;

preferably, the second phase coil 23 includes a second low-voltage coil sleeved outside the second phase leg 212, a second high-voltage coil sleeved outside the second low-voltage coil, a second lower mounting seat connected to lower ends of the second low-voltage coil and the second high-voltage coil, a second upper mounting seat connected to upper ends of the second low-voltage coil and the second high-voltage coil, and a second locking device for locking the second low-voltage coil and the second high-voltage coil;

preferably, the second lower mounting base includes a second lower connection ring sleeved outside the second phase leg 212 and connected to the second phase leg 212, a second lower mounting plate sleeved outside the second lower connection ring, a second lower connection block connected between the second lower connection ring and the second lower mounting plate, a second lower low voltage connector electrically connected to a lower terminal connector of the second low voltage coil, and a second lower high voltage connector electrically connected to a lower terminal connector of the second high voltage coil; the second lower mounting plate is provided with a second lower low-voltage mounting groove for inserting the lower end of the second low-voltage coil and a second lower high-voltage mounting groove for inserting the lower end of the second high-voltage coil; a second lower gap for natural ester to flow through is formed between the adjacent second lower connecting blocks;

preferably, the second upper mount includes a second upper connection ring fitted over the second phase leg 212, a second upper mounting plate fitted over the second upper connection ring, a second upper connection block connected between the second upper connection ring and the second upper mounting plate, a second upper low-voltage terminal electrically connected to the upper terminal of the second low-voltage coil, and a second upper high-voltage terminal electrically connected to the upper terminal of the second high-voltage coil; the second upper mounting plate is provided with a second upper low-voltage mounting groove for inserting the upper end of the second low-voltage coil and a second upper high-voltage mounting groove for inserting the lower end of the second high-voltage coil; a second upper gap for natural ester to flow through is arranged between the adjacent second upper connecting blocks; the second upper connecting ring is formed with a second trepan boring sleeved on the second phase limb 212;

preferably, the second locking device includes a second fixed threaded sleeve fixedly sleeved on the second phase core column 212, and a second abutting nut matched with the second fixed threaded sleeve and abutting downward against the second upper connecting ring; the peripheral surface of the second fixed threaded sleeve is provided with an external thread which is in threaded fit with the second abutting nut;

preferably, the third phase coil 24 includes a third low-voltage coil sleeved outside the third phase leg 213, a third high-voltage coil sleeved outside the third low-voltage coil, a third lower mounting seat connected to lower ends of the third low-voltage coil and the third high-voltage coil, a third upper mounting seat connected to upper ends of the third low-voltage coil and the third high-voltage coil, and a third locking device for locking the third low-voltage coil and the third high-voltage coil;

preferably, the third lower mount includes a third lower connection ring sleeved outside the third phase leg 213 and connected to the third phase leg 213, a third lower mounting plate sleeved outside the third lower connection ring, a third lower connection block connected between the third lower connection ring and the third lower mounting plate, a third lower low-voltage connector electrically connected to a lower end wire connector of the third low-voltage coil, and a third lower high-voltage connector electrically connected to a lower end wire connector of the third high-voltage coil; the third lower mounting plate is provided with a third lower low-voltage mounting groove for inserting the lower end of the third low-voltage coil and a third lower high-voltage mounting groove for inserting the lower end of the third high-voltage coil; a third lower gap for natural ester to flow through is formed between the adjacent third lower connecting blocks;

preferably, the third upper mount includes a third upper connection ring fitted over the third phase leg 213, a third upper mount plate fitted over the third upper connection ring, a third upper connection block connected between the third upper connection ring and the third upper mount plate, a third upper low-voltage terminal electrically connected to the upper end wire terminal of the third low-voltage coil, and a third upper high-voltage terminal electrically connected to the upper end wire terminal of the third high-voltage coil; the third upper mounting plate is provided with a third upper low-voltage mounting groove for inserting the upper end of the third low-voltage coil and a third upper high-voltage mounting groove for inserting the lower end of the third high-voltage coil; a third upper gap for natural ester to flow through is formed between the adjacent third upper connecting blocks; the third upper connecting ring is provided with a third sleeve hole sleeved on the third phase core column 213;

preferably, the third locking device includes a third fixed threaded sleeve fixedly sleeved on the third phase core column 213, and a third abutting nut matched with the third fixed threaded sleeve and abutting against the third upper connecting ring downward; the peripheral surface of the third fixed threaded sleeve is provided with an external thread which is in threaded fit with the third abutting nut;

preferably, the upper core beam 214 is of a split structure with the first phase leg 211, the second phase leg 212 and the third phase leg 213, and the upper core beam 214 is connected with the first phase leg 211, the second phase leg 212 and the third phase leg 213 through a connecting mechanism; the upper core beam 214 has a first connection portion connected to the upper end of the first phase leg 211, a second connection portion connected to the upper end of the second phase leg 212, and a third connection portion connected to the upper end of the third phase leg 213; a first lower connection inclined surface 2111 inclined from top to bottom toward the third phase leg 213 is formed at the upper end of the first phase leg 211, and a plurality of first lower corrugations 21111 are formed on the first lower connection inclined surface 2111; the first connection portion is formed with a first upper connection inclined surface 2141 corresponding to the first lower connection inclined surface 2111, and the first upper connection inclined surface 2141 is formed with a plurality of first upper corrugations 21411 engaged with the respective first lower corrugations 21111; a tapered tip 2121 is formed at the upper end of the second phase core column 212, and the tapered tip 2121 includes a first downward tapered inclined surface 21211 gradually inclined toward the first phase core column 211 from top to bottom, and a second downward tapered inclined surface 21212 gradually inclined toward the third phase core column 213 from top to bottom; the first lower tapered inclined surface 21211 and the second lower tapered inclined surface 21212 are both formed with a plurality of second lower raised grains; the second connecting portion is formed with a tapered groove to be fitted with the tapered tip 2121, the tapered groove including a first upper tapered inclined surface 21421 corresponding to the first lower tapered inclined surface 21211, and a second upper tapered inclined surface 21422 corresponding to the second lower tapered inclined surface 21212; the first upper cone inclined plane 21421 and the second upper cone inclined plane 21422 form a plurality of second upper corrugations which are matched and engaged with the second lower corrugations;

preferably, a third lower connection inclined surface 2131 inclined from top to bottom toward the first phase leg 211 is formed at the upper end of the third phase leg 213, and the third lower connection inclined surface 2131 is formed with a plurality of third lower raised grains 21311; the third connecting portion is formed with a third upper connecting inclined surface 2143 corresponding to the third lower connecting inclined surface 2131, and the third upper connecting inclined surface 2143 is formed with a plurality of third upper corrugations 21431 matching and engaging with the respective third lower corrugations 21311;

preferably, the connection mechanism comprises a connection cap 251 wrapping the upper ends of the upper core beam 214, the first phase leg 211 and the third phase leg 213, a first connection part between the first phase leg 211 and the second phase leg 212 locking the connection cap 251, and a second connection part 253 between the third phase leg 213 and the second phase leg 212 locking the connection cap 251;

preferably, the first connection parts include a first upper connection member 2521 that downwardly pockets the connection cap 251, a first lower connection member 2522 that upwardly pockets the lower core beam 215, and a first connection bolt 2523 that connects the first upper connection member 2521 and the first lower connection member 2522; the first upper connecting member 2521 includes a first upper horizontal limiting plate 25211 parallel to and corresponding to the upper surface of the upper core beam 214, two first upper vertical limiting plates 25212 parallel to and corresponding to the two side surfaces of the upper core beam 214, and two first upper locking plates 25213 connected to the lower edges of the two first upper vertical limiting plates 25212; the two first upper fixing plates 25213 are horizontally arranged and vertically connected with the two first upper vertical limiting plates 25212 in a one-to-one correspondence manner; the first lower connecting member 2522 includes a first lower horizontal limiting plate 25221 parallel to and corresponding to the lower surface of the lower core beam 215, two first lower vertical limiting plates 25222 parallel to and corresponding to the two side surfaces of the lower core beam 215 and extending upward, and two first lower locking plates 25223 connected to the upper edges of the two first lower vertical limiting plates 25222; the two first lower locking plates 25223 are horizontally arranged and are located below the two first upper locking plates 25213 in a one-to-one correspondence manner; the first connecting bolt 2523 passes through the corresponding first upper locking plate 25213 and first lower locking plate 25223 for locking;

preferably, the second connection part 253 includes a second upper connection member 2531 downwardly catching the connection cap 251, a second lower connection member 2532 upwardly catching the lower core beam 215, and a second connection bolt 2533 connecting the second upper connection member 2531 and the second lower connection member 2532; the second upper connecting member 2531 includes a second upper horizontal limiting plate 25311 parallel to and corresponding to the upper surface of the upper core beam 214, two second upper vertical limiting plates 25312 parallel to and corresponding to both side surfaces of the upper core beam 214, and two second upper locking plates 25313 connected to the lower edges of the two second upper vertical limiting plates 25312; the two second upper fixing plates 25313 are horizontally arranged and are vertically connected with the two second upper vertical limiting plates 25312 in a one-to-one correspondence manner; the second lower connecting member 2532 includes a second lower horizontal limiting plate 25321 parallel to and corresponding to the lower surface of the lower core beam 215, two second lower vertical limiting plates 25322 parallel to and corresponding to both side surfaces of the lower core beam 215 and extending upward, and two second lower locking plates 25323 connected to upper edges of the two second lower vertical limiting plates 25322; the two second lower locking plates 25323 are horizontally arranged and are correspondingly arranged below the two second upper locking plates 25313 one by one; the second connecting bolt 2533 penetrates through the corresponding second upper locking plate 25313 and second lower locking plate 25323 to be locked. In the actual working process of the invention, when the first low-voltage coil 221, the first high-voltage coil 222, the second low-voltage coil, the second high-voltage coil, the third low-voltage coil or the third high-voltage coil is broken through by current, a worker can directly operate on site, firstly, natural ester in the main box body 1 is led out to the auxiliary box body 4 through the oil guide port, then, the main box body 1 is opened, the first connecting bolt 2523 and the second connecting bolt 2533 are operated, the first upper connecting piece 2521 and the first lower connecting piece 2522, and the second upper connecting piece 2531 and the second lower connecting piece 2532 are disassembled, the connecting cap 225251 is disassembled, then, the upper core beam 214 is taken down from the first phase core column 211, the second phase core column 212 and the third phase core column 213, if the first low-voltage coil 221 or the first high-voltage coil 222 is damaged, the first abutting nut is screwed down from the first fixed threaded sleeve 1, and then the first upper mounting seat is taken down, then, the damaged first low voltage coil 221 or first high voltage coil 222 is removed upward, a new first low voltage coil 221 or first high voltage coil 222 is fitted over the first phase leg 211 and moved downward, so that the lower end of the first low voltage coil 221 or first high voltage coil 222 is fittingly inserted into the first lower low voltage mounting groove 22321 or first lower high voltage mounting groove 22322 of the first lower mounting seat, and the lower end terminal of the first low voltage coil 221 is brought into corresponding contact with the first lower low voltage terminal in the first lower low voltage mounting groove 22321 to achieve electrical connection, the lower end terminal of the first high voltage coil 222 is brought into corresponding contact with the first lower high voltage terminal 22351 in the first lower high voltage mounting groove 22322 to achieve electrical connection, and then the first upper mounting seat is fitted over the first phase leg 211 and moved downward, so that the upper end of the first low voltage coil 221 or first high voltage coil 222 is fittingly inserted into the first upper low voltage mounting groove 22421 or first upper high voltage mounting groove 22422 of the first upper mounting seat, and the upper terminal of the first low-voltage coil 221 is brought into corresponding contact with the first upper low-voltage connector in the first upper low-voltage mounting groove 22421 to be electrically connected, the upper terminal of the first high-voltage coil 222 is brought into corresponding contact with the first upper high-voltage connector in the first upper high-voltage mounting groove 22422 to be electrically connected, then, the first abutting nut is sleeved on the first fixed thread sleeve 2251 and is screwed downwards to abut against the first upper mounting seat downwards, so that the first upper mounting seat is matched with the first lower mounting seat to clamp and fix the first low-voltage coil 221 and the first high-voltage coil 222, and keeps the upper and lower terminal connections of the first low-voltage coil 221 stably electrically connected to the first upper and lower low-voltage connections, respectively, and keeps the upper and lower terminal connections of the first high-voltage coil 222 stably electrically connected to the first upper and lower high-voltage connections 22351, respectively; then, the upper core beam 214 is placed on the first phase leg 211, the second phase leg 212, and the third phase leg 213, so that the first lower connection inclined surface 2111 corresponds to the first upper connection inclined surface 2141, and the first lower corrugations 21111 are matched and engaged with the first upper corrugations 21411 to achieve magnetic conductivity communication; the first lower conical inclined surface 21211 corresponds to the first upper conical inclined surface 21421, the second lower conical inclined surface 21212 corresponds to the second upper conical inclined surface 21422, and each second lower raised grain is matched and meshed with each corresponding second upper raised grain to realize magnetic communication; the third lower connecting inclined plane 2131 corresponds to the third upper connecting inclined plane 2143, and the third lower raised grain 21311 is matched with the third upper raised grain 21431 and is meshed together to realize magnetic conductivity communication; then, the first upper connecting member 2521 and the first lower connecting member 2522, and the second upper connecting member 2531 and the second lower connecting member 2532 are respectively and correspondingly locked by using the first connecting bolt 2523 and the second connecting bolt 2533, so that the upper core beam 214, the first phase core column 211, the second phase core column 212 and the third phase core column 213 are all stably and magnetically communicated, the three-phase core is closed, and then natural ester is re-injected into the main tank 1, and the transformer can normally work after re-closing and adjustment are performed. If the second phase coil 23 and the third phase coil 24 are damaged, the principle is similar to the foregoing principle. The lower gaps and the upper gaps are matched with each other to enable the natural ester to flow between the high-voltage coil and the low-voltage coil, so that the high-voltage coil and the low-voltage coil are insulated and radiated.

Preferably, an oil outlet cavity is formed at the lower end of the main box body 1, and the oil outlet cavity is tapered from top to bottom; the upper end of the oil outlet cavity is provided with an oil leakage screen plate with meshes, and the oil guide port is formed at the lower end of the oil outlet cavity; the oil inlet pipe 33 and the oil guide pipe 41 are both communicated with the oil guide port. The natural ester can flow out of the oil outlet cavity more smoothly and efficiently without residue through the oil leaking net plate. Preferably, the three-phase iron core is arranged on the oil leakage net plate.

In order to improve the defect that the natural ester is easy to mix air after working for a long time or after opening the tank main body and in the process of introducing and exporting the natural ester, the natural ester is easy to be mixed with the air, and the performance of the natural ester such as insulation is seriously influenced, the oil purifier preferably comprises a vertically arranged cylindrical shell 31, an adsorption part 32 arranged in the shell 31, an oil inlet pipe 33 and an oil outlet pipe 34 communicated between the shell 31 and the main tank body 1, an oil inlet power device arranged on the oil inlet pipe 33, an oil outlet power device arranged on the oil outlet pipe 34 and an air bubble extraction device; the housing 31 is formed with an oil inlet communicating with the oil inlet pipe 33 and an oil outlet communicating with the oil outlet pipe 34; the oil inlet is positioned above the adsorption part 32, and the oil outlet is positioned below the adsorption part 32; the oil inlet pipe 33 at least has an oil inlet elastic pipe section 331 corresponding to the oil inlet power plant, and the oil outlet pipe 34 at least has an oil outlet elastic pipe section 341 corresponding to the oil outlet power plant; preferably, the oil inlet elastic pipe section 331 and the oil outlet elastic pipe section 341 are made of elastic materials such as rubber;

the oil inlet power device comprises an oil inlet bearing groove seat 351 for bearing an oil inlet elastic pipe section 331, an oil inlet rolling wheel 352 for circularly rolling the oil inlet elastic pipe section 331, an oil inlet transmission shaft 353 for driving the oil inlet rolling wheel 352 to rotate, and an oil inlet driving motor for driving the oil inlet transmission shaft 353 to rotate; the oil inlet bearing groove seat 351 is provided with an oil inlet arc-shaped groove 3511 for accommodating the oil inlet elastic pipe section 331, and the axis of the oil inlet transmission shaft 353 penetrates through the circle center of the oil inlet arc-shaped groove 3511; the oil inlet rolling wheel 352 comprises a plurality of oil inlet rolling rods 3521 extending along the radial direction of the oil inlet transmission shaft 353 and a plurality of oil inlet rolling rollers 3522 arranged at the end parts of the oil inlet rolling rods 3521 in a one-to-one correspondence manner; each oil inlet rolling roller 3522 circularly enters the oil inlet circular arc groove 3511 to roll the oil inlet elastic pipe section 331; each oil inlet rolling roller 3522 is parallel to the oil inlet transmission shaft 353; the oil outlet power device comprises an oil outlet bearing groove seat 361 for bearing the oil outlet elastic pipe section 341, an oil outlet rolling wheel 362 for circularly rolling the oil outlet elastic pipe section 341, an oil outlet transmission shaft 363 for driving the oil outlet rolling wheel 362 to rotate, and an oil outlet driving motor for driving the oil outlet transmission shaft 363 to rotate; the oil outlet bearing groove seat 361 is provided with an oil outlet circular arc groove 3611 for accommodating the oil outlet elastic pipe section 341, and the axis of the oil outlet transmission shaft 363 passes through the circle center of the oil outlet circular arc groove 3611; the oil outlet rolling wheel 362 comprises a plurality of oil outlet rolling rods 3621 extending along the radial direction of the oil outlet transmission shaft 363, and a plurality of oil outlet rolling rollers 3622 arranged at the end parts of the oil outlet rolling rods 3621 in a one-to-one correspondence manner; each oil outlet rolling roller 3622 circularly enters an oil outlet circular arc groove 3611 to roll the oil outlet elastic pipe section 341; each oil outlet roller 3622 is parallel to the oil outlet transmission shaft 363;

the bubble extraction device comprises a piston 371 which is arranged in the shell 31 in a sealing sliding way, a piston rod 372 which drives the piston 371 to move up and down and penetrates through the upper end of the shell 31, a lifting driving device 373 which drives the piston rod 372 to move up and down, and an exhaust mechanism which exhausts air; a first through hole through which the piston rod 372 penetrates is formed at the upper end of the housing 31, and a second through hole 3711 through which the piston rod 371 penetrates vertically is formed; the exhaust mechanism comprises a sealing baffle 3741 arranged in the shell 31, a first one-way valve 3742 arranged on the sealing baffle 3741 and used for ventilating upwards, and a second one-way valve 3743 arranged in the second through hole 3711 and used for ventilating upwards; the sealing baffle 3741 is formed with a third through hole 37411 for installing the first one-way valve 3742, and the upper end of the housing 31 is also formed with an exhaust hole 311; a seal retainer 3741 is located below the piston 371 and above the oil inlet. In the actual working process, the oil purifier circularly purifies the natural ester in the main box body 1, specifically, an oil inlet driving motor drives an oil inlet transmission shaft 353 to drive an oil inlet rolling wheel 352 to rotate, the oil inlet rolling wheel 352 drives each oil inlet rolling roller 3522 to circularly roll an oil inlet elastic pipe section 331 through each oil inlet rolling rod 3521, so that the natural ester in the oil inlet elastic pipe section 331 is gradually extruded into the shell 31, the natural ester in the main box body 1 is gradually conveyed into the shell 31 through the oil inlet rolling rollers 3522, and the adsorption part 32 carries out adsorption, impurity removal and purification; meanwhile, the oil outlet driving motor drives the oil outlet transmission shaft 363 to drive the oil outlet rolling wheel 362 to rotate, the oil outlet rolling wheel 362 drives each oil outlet rolling roller 3622 to circularly roll the oil outlet elastic pipe section 341 through each oil outlet rolling rod 3621, so that the natural ester in the oil outlet elastic pipe section 341 is gradually extruded into the main box body 1, and the purified natural ester in the shell 31 is gradually conveyed into the main box body 1 by the oil outlet rolling rollers 3622; the bubble extraction device can be controlled by a controller, so that the lifting driving device 373 drives the piston rod 372 to drive the piston 371 to move upwards, the first one-way valve 3742 is in an open state in the upward movement process of the piston 371, and the second one-way valve 3743 is in a sealed state in the upward movement process of the piston 371, so that negative pressure is formed in the shell 31, the micro bubbles mixed in the natural ester are gradually enlarged and float to the surface of the natural ester, and air in the natural ester enters between the sealing baffle 3741 and the piston 371 to be extracted; when the air in the housing 31 reaches a certain amount, the piston rod 372 is driven by the lifting driving device 373 to drive the piston 371 to move downward, and at this time, the first one-way valve 3742 is in a closed state, and the second one-way valve 3743 is in an open state, so that the air between the sealing baffle 3741 and the piston 371 is gradually exhausted from the second one-way valve 3743. The oil inlet rolling roller 3522 can roll the oil inlet elastic pipe section 331 in a one-way mode, the oil outlet rolling roller 3622 can roll the oil outlet elastic pipe section 341 in a one-way mode, natural ester can be prevented from flowing backwards, and flow can not be accelerated due to negative pressure in the shell 31, so that the oil inlet driving motor and the oil outlet driving motor can be stopped or can continue to work in the negative pressure forming process in the shell 31; and the lifting driving device 373 can move up or down while the suction fan is sucking air. The oil inlet circular arc groove 3511 can ensure that the oil inlet rolling roller 3522 can always maintain constant roller pressure on the oil inlet elastic pipe section 331 and cannot backflow, and the oil outlet circular arc groove 3611 can ensure that the oil outlet rolling roller 3622 can always maintain constant roller pressure on the oil outlet elastic pipe section 341 and cannot backflow. Preferably, the upper end of the housing 31 is formed with an air vent to facilitate movement of the piston 371 and air discharge.

Preferably, the lifting driving device 373 includes a driving plate 3731 connected to the upper end of the piston rod 372, a screw 3732 for driving the driving plate 3731 to move up and down, and a lifting driving motor 3733 for driving the screw 3732 to rotate; the driving plate 3731 is formed with a screw hole to be fitted with the screw 3732.

In order to protect the main structures of the oil inlet power device and the oil outlet power device, and to ensure that the structures are more reasonable and the operation is smooth, preferably, an oil inlet bearing groove seat 351 is formed with an oil inlet containing cavity for containing an oil inlet rolling wheel 352, and an oil inlet arc-shaped groove 3511 is positioned at the lower part of the oil inlet containing cavity; the oil inlet bearing groove seat 351 is provided with two oil inlet limiting holes which are positioned at two ends of the oil inlet arc-shaped groove 3511 and through which the oil inlet pipe 33 passes, and the oil inlet limiting holes can limit and fix the oil inlet pipe 33; the oil outlet bearing groove seat 361 is provided with an oil outlet cavity for accommodating the oil outlet rolling wheel 362, and the oil outlet circular arc-shaped groove 3611 is positioned at the lower part of the oil outlet cavity; the oil outlet bearing groove seat 361 is formed with two oil outlet limiting holes which are positioned at two ends of the oil outlet circular arc-shaped groove 3611 and through which the oil outlet pipe 34 passes, and the oil outlet limiting holes can limit and fix the oil outlet pipe 34. Preferably, the oil inlet holds the chamber and the appearance chamber that produces oil all sets the chamber lid and covers the protection.

Preferably, the oil inlet rolling rollers 3522 are connected with the end of the corresponding oil inlet rolling rod 3521 through oil inlet rotating shafts; the oil outlet roller rollers 3622 are connected to the ends of the corresponding oil outlet roller rods 3621 through oil outlet rotating shafts. The oil inlet roller pressing roller 3522 rotates by means of an oil inlet rotating shaft, and the oil outlet roller pressing roller 3622 rotates by means of an oil outlet rotating shaft.

Preferably, the oil inlet rolling rods 3521 are uniformly arranged around the oil inlet transmission shaft 353, and each oil inlet rolling rod 3521 is connected with the oil inlet transmission shaft 353 through a shaft sleeve; the oil outlet roller pressing rods 3621 are uniformly arranged around the oil outlet transmission shaft 363, and each oil outlet roller pressing rod 3621 is connected with the oil outlet transmission shaft 363 through a shaft sleeve. The shaft sleeve is connected with the oil inlet transmission shaft 353 and the oil outlet transmission shaft 363 in a key mode, so that the oil inlet transmission shaft 353 drives the oil inlet roller pressing rod 3521 to rotate synchronously, and the oil outlet transmission shaft 363 drives the oil outlet roller pressing rod 3621 to rotate synchronously.

Preferably, the first lower low voltage terminal includes a first lower inner low voltage terminal 22341 disposed in the first lower low voltage mounting groove 22321 and in direct electrical contact with the lower terminal of the first low voltage coil 221, a first lower outer low voltage terminal 22342 disposed outside the first lower mounting plate 2232 and connected to the low voltage wire, and a first lower low voltage connection line 22343 embedded in the first lower mounting plate 2232 and connected between the first lower inner low voltage terminal 22341 and the first lower outer low voltage terminal 22342; the first upper low voltage connector includes a first upper inner low voltage connector 22441 disposed in the first upper low voltage mounting groove 22421 and in direct electrical contact with the upper terminal connector of the first low voltage coil 221, a first upper outer low voltage connector 22442 connected to a low voltage wire, disposed outside the first upper mounting plate 2242, and a first upper low voltage connection wire 22443 embedded in the first upper mounting plate 2242 and connected between the first upper inner low voltage connector 22441 and the first upper outer low voltage connector 22442;

the first lower high voltage terminal 22351 includes a first lower inner high voltage terminal disposed in the first lower high voltage mounting groove 22322 and in direct electrical contact with the lower terminal of the first high voltage coil 222, a first lower outer high voltage terminal 22352 disposed outside the first lower mounting plate 2232 and connected to the high voltage wire, and a first lower high voltage connection line 22353 embedded in the first lower mounting plate 2232 and connected between the first lower inner high voltage terminal and the first lower outer high voltage terminal 22352; the first high voltage connection includes a first upper inner high voltage connector 22451 provided in the first upper high voltage mounting groove 22422 and in direct electrical contact with the upper terminal connector of the first high voltage coil 222, a first upper outer high voltage connector 22452 provided outside the first upper mounting plate 2242 and connected to a high voltage wire, and a first upper high voltage connection line 22453 embedded in the first upper mounting plate 2242 and connected between the first upper inner high voltage connector 22451 and the first upper outer high voltage connector 22452;

the third lower low-voltage connector comprises a third lower inner low-voltage connector, a third lower outer low-voltage connector and a third lower low-voltage connecting wire, wherein the third lower inner low-voltage connector is arranged in the third lower low-voltage mounting groove and is in direct electrical contact with the lower end wire connector of the third low-voltage coil; the third upper low-voltage connector comprises a third upper inner low-voltage connector, a third upper outer low-voltage connector and a third upper low-voltage connecting wire, wherein the third upper inner low-voltage connector is arranged in the third upper low-voltage mounting groove and is in direct electrical contact with the upper end wire connector of the third low-voltage coil;

the third lower high-voltage connector comprises a third lower inner high-voltage connector, a third lower outer high-voltage connector and a third lower high-voltage connecting wire, wherein the third lower inner high-voltage connector is arranged in the third lower high-voltage mounting groove and is in direct electrical contact with a lower end wire connector of the third high-voltage coil; the third high-voltage connector comprises a third upper inner high-voltage connector, a third upper outer high-voltage connector and a third upper high-voltage connecting wire, wherein the third upper inner high-voltage connector is arranged in the third upper high-voltage mounting groove and is in direct electrical contact with the upper end wire connector of the third high-voltage coil, the third upper outer high-voltage connector is arranged outside the third upper mounting disc and is connected with a high-voltage wire, and the third upper high-voltage connecting wire is embedded in the third upper mounting disc and is connected between the third upper inner high-voltage connector and the third upper outer high-.

Preferably, the oil-gas separator further comprises an auxiliary box body 4 communicated with the oil guide port, an oil guide pipe 41 connected between the oil guide port and the auxiliary box body 4, and an oil guide power device arranged on the oil guide pipe 41; the oil guide pipe 41 at least has an oil guide elastic pipe section 411 corresponding to the oil guide power device; the oil guiding power device comprises an oil guiding bearing groove seat 421 for bearing the oil guiding elastic pipe section 411, an oil guiding roller wheel 422 for circularly rolling the oil guiding elastic pipe section 411, an oil guiding transmission shaft 423 for driving the oil guiding roller wheel 422 to rotate, and an oil guiding driving motor for driving the oil guiding transmission shaft 423 to rotate; the oil guide bearing groove seat 421 is formed with an oil guide circular arc groove 4211 for accommodating the oil guide elastic pipe section 411, the axis of the oil guide transmission shaft 423 passes through the circle center of the oil guide circular arc groove 4211, and each oil guide roller 4222 circularly enters the oil guide circular arc groove 4211 to roll the oil guide elastic pipe section 411; the oil guide rolling wheel 422 comprises a plurality of oil guide rolling rods 4221 extending along the radial direction of the oil guide transmission shaft 423 and a plurality of oil guide rolling rollers 4222 arranged at the end parts of the oil guide rolling rods 4221 in a one-to-one correspondence manner; each oil guide roller 4222 is parallel to the oil guide transmission shaft 423. In the actual installation process of each high-voltage coil, low-voltage coil and the like, the natural ester in the main box body 1 is led out into the auxiliary box body 4, specifically, the oil guide driving motor drives the oil guide transmission shaft 423 to drive the oil guide roller wheel 422 to rotate, the oil guide roller wheel 422 drives each oil guide roller 4222 to circularly roll the oil guide elastic pipe section 411 through each oil guide roller pressing rod 4221, so that the natural ester in the oil guide elastic pipe section 411 is gradually extruded and enters the auxiliary box body 4 to be temporarily stored. After the installation is completed, the oil guide driving motor rotates reversely and drives the oil guide transmission shaft 423 to drive the oil guide roller 422 to rotate, the oil guide roller 422 drives the oil guide roller 4222 to circularly roll the oil guide elastic pipe section 411 through the oil guide roller pressing rods 4221, so that natural ester in the oil guide elastic pipe section 411 is gradually extruded into the main box body 11 to wash and soak the components such as the coil and the like for reuse.

In order to enhance convenience of installation, it is preferable that the edge of the first lower low voltage installation groove 22321 is formed with a compliant slope in which the lower end of the first low voltage coil 221 is smoothly caught; a homeotropic inclined plane for the upper end of the first low voltage coil 221 to be snapped is formed at the edge of the first upper low voltage mounting groove 22421; a homeotropic slope for the lower end of the first high voltage coil 222 to be snapped is formed at the edge of the first lower high voltage mounting groove 22322; a homeotropic inclined plane for the upper end of the first high voltage coil 222 to be snapped is formed at the edge of the first high voltage mounting groove 22422;

a homeotropic inclined plane for allowing the lower end of the second low-voltage coil to be clamped into is formed at the edge of the second lower low-voltage mounting groove; a homeotropic inclined plane for allowing the upper end of the second low-voltage coil to be clamped into is formed at the edge of the second upper low-voltage mounting groove; a homeotropic inclined plane for the lower end of the second high-voltage coil to be clamped into is formed at the edge of the second lower high-voltage mounting groove; a homeotropic inclined plane for the upper end of the second high-voltage coil to be clamped into is formed at the edge of the second high-voltage mounting groove;

a homeotropic inclined plane for allowing the lower end of the third low-voltage coil to be clamped in homeotropically is formed at the edge of the third lower low-voltage mounting groove; a homeotropic inclined plane for allowing the upper end of the third low-voltage coil to be clamped into is formed at the edge of the third upper low-voltage mounting groove; a homeotropic inclined plane for allowing the lower end of the third high-voltage coil to be clamped into is formed at the edge of the third lower high-voltage mounting groove; and a homeotropic inclined plane for allowing the upper end of the third high-voltage coil to be clamped into is formed at the edge of the third high-voltage mounting groove.

Preferably, each lower mounting seat further comprises a support seat supported below each lower connecting ring and connected with the corresponding phase core column. Each supporting seat can stably support the part supported by the supporting seat, so that the position accuracy and the working stability are ensured.

Preferably, each lower connecting ring and each supporting seat are fixedly connected with the corresponding phase core column through resin glue. The resin adhesive may be an epoxy resin adhesive with high viscosity and high insulation.

Preferably, the lower end of the housing 31 is provided with a drain outlet provided with a drain valve.

Preferably, each of the locking means and the first connecting means is made of an insulating material. The structure can ensure that each component can not influence induction magnetic induction lines and currents in each coil and the three-phase iron core, and ensure the working stability of the transformation main body 2.

Preferably, the oil inlet pipe 33 and the oil outlet pipe 34 are both elastic hoses as a whole. The installation is convenient and the cost is low.

Preferably, the lower core beam 215 is provided with an insulating base connected to the bottom of the main body case 1. The structure can separate the main circuit devices such as the transformation main body 2 and the like from the shell parts such as the box main body and the like by the insulating base, and the electric leakage and the induction magnetic induction line and the current of the transformation main body 2 are not influenced.

The product form of the present invention is not limited to the embodiments and examples shown in the present application, and any suitable changes or modifications of the similar ideas should be made without departing from the patent scope of the present invention.

Claims

1. A natural ester insulating oil distribution transformer comprises a main box body, a transformation main body and natural ester which are arranged in the main box body, a radiator arranged outside the main box body and an oil purifier for filtering the natural ester; the main box body is provided with an oil guide port; the transformation main body comprises a three-phase iron core, and a first phase coil, a second phase coil and a third phase coil which are sleeved on the three-phase iron core; the three-phase iron core comprises a first-phase core column, a second-phase core column and a third-phase core column which are vertically arranged, an upper core beam and a lower core beam, wherein the upper core beam is horizontally connected among the upper ends of the first-phase core column, the upper ends of the second-phase core column and the upper end of the third-phase core column, and the lower core beam is horizontally connected among the lower ends of the first-phase core column, the lower ends of the second-phase core column; the second-phase core column is connected between the middle parts of the upper core beam and the lower core beam; the method is characterized in that: the first phase coil comprises a first low-voltage coil sleeved outside the first phase core column, a first high-voltage coil sleeved outside the first low-voltage coil, a first lower mounting seat connected to the lower ends of the first low-voltage coil and the first high-voltage coil, a first upper mounting seat connected to the upper ends of the first low-voltage coil and the first high-voltage coil, and a first locking device for locking the first low-voltage coil and the first high-voltage coil;

2. A natural ester insulating oil distribution transformer as claimed in claim 1, wherein: the oil purifier comprises a cylindrical shell which is vertically arranged, an adsorption part which is arranged in the shell, an oil inlet pipe and an oil outlet pipe which are communicated between the shell and the main box body, an oil inlet power device which is arranged on the oil inlet pipe, an oil outlet power device which is arranged on the oil outlet pipe and a bubble extraction device; the shell is provided with an oil inlet communicated with the oil inlet pipe and an oil outlet communicated with the oil outlet pipe; the oil inlet is positioned above the adsorption part, and the oil outlet is positioned below the adsorption part; the oil inlet pipe is at least provided with an oil inlet elastic pipe section corresponding to the oil inlet power device, and the oil outlet pipe is at least provided with an oil outlet elastic pipe section corresponding to the oil outlet power device;

3. A natural ester insulating oil distribution transformer as claimed in claim 2, wherein: the lifting driving device comprises a transmission plate connected with the upper end of the piston rod, a screw rod for driving the transmission plate to move up and down, and a lifting driving motor for driving the screw rod to rotate; the transmission plate is provided with a screw hole matched with the screw rod.

4. A natural ester insulating oil distribution transformer as claimed in claim 3, wherein: the first lower low-voltage connector comprises a first lower inner low-voltage connector, a first lower outer low-voltage connector and a first lower low-voltage connecting wire, wherein the first lower inner low-voltage connector is arranged in the first lower low-voltage mounting groove and is in direct electrical contact with a lower end wire connector of the first low-voltage coil; the first upper low-voltage connector comprises a first upper inner low-voltage connector, a first upper outer low-voltage connector and a first upper low-voltage connecting wire, wherein the first upper inner low-voltage connector is arranged in the first upper low-voltage mounting groove and is in direct electrical contact with an upper end wire connector of the first low-voltage coil;

5. The natural ester insulating oil distribution transformer of claim 4, wherein: the auxiliary box body is communicated with the oil guide port, the oil guide pipe is connected between the oil guide port and the auxiliary box body, and the oil guide power device is arranged on the oil guide pipe; the oil guide pipe is at least provided with an oil guide elastic pipe section corresponding to the oil guide power device; the oil guide power device comprises an oil guide bearing groove seat for bearing the oil guide elastic pipe section, an oil guide roller pressing wheel for circularly rolling the oil guide elastic pipe section, an oil guide transmission shaft for driving the oil guide roller pressing wheel to rotate, and an oil guide driving motor for driving the oil guide transmission shaft to rotate; the oil guide bearing groove seat is provided with an oil guide circular arc groove for accommodating the oil guide elastic pipe section, the axis of the oil guide transmission shaft penetrates through the circle center of the oil guide circular arc groove, and each oil guide roller circularly enters the oil guide circular arc groove to roll the oil guide elastic pipe section; the oil guide rolling wheel comprises a plurality of oil guide rolling rods extending along the radial direction of the oil guide transmission shaft and a plurality of oil guide rolling rollers arranged at the end parts of the oil guide rolling rods in a one-to-one correspondence manner; and each oil guide roller is parallel to the oil guide transmission shaft.