CN112583185A

CN112583185A - Sealing structure for magnetic suspension motor and magnetic suspension motor

Info

Publication number: CN112583185A
Application number: CN202110205118.8A
Authority: CN
Inventors: 蒋文杰; 梁红阳; 王闯; 王华军; 饶靖
Original assignee: Suzhou Baobang Electric Co ltd
Current assignee: Suzhou Baobang Electric Co ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2021-03-30
Anticipated expiration: 2041-02-24
Also published as: CN112583185B

Abstract

The invention relates to the technical field of motors, in particular to a sealing structure for a magnetic levitation motor and a magnetic levitation motor. The sealing structure for a magnetic levitation motor includes a rotating shaft; On the rotating shaft and between the rotating shaft and the outer cover, a first gap exists between the sealing member and the rotating shaft; the sealing member is provided with a first gap communicating with the first gap. A through hole and a second through hole, the first through hole communicates with the nitrogen gas source, the second through hole is used for exhaust, and the first through hole is away from the magnetic levitation motor seal relative to the second through hole Structure of the rotor. The invention can ensure the protection of the motor, reduce the use of nitrogen, and save costs.

Description

Sealing structure for magnetic suspension motor and magnetic suspension motor

Technical Field

The invention relates to the technical field of motors, in particular to a sealing structure for a magnetic suspension motor and the magnetic suspension motor.

Background

In the magnetic suspension motor, because a gap is formed between the impeller and the back plate, a part of gas medium in gas entering the volute from the air inlet can be leaked to the inside of the motor through gaps among the shaft, the sealing ring and the thrust disc after the gas winds the impeller, so that the motor is corroded.

In the existing sealing technology, a plurality of holes are directly formed in a back plate of a volute at intervals along the circumferential direction of the back plate, high-pressure nitrogen (higher than the pressure at an outlet of the volute) is introduced into the holes, and the nitrogen plays a role of positive pressure and blocks gas in the volute. However, very high nitrogen pressure and flow are needed, and under the condition of long-time operation, a nitrogen gas source needs to be replaced frequently, so that nitrogen is wasted seriously, and the economic cost is increased.

Therefore, a sealing structure for a magnetic levitation motor and a magnetic levitation motor are needed to solve the above technical problems.

Disclosure of Invention

The invention aims to provide a sealing structure for a magnetic suspension motor and the magnetic suspension motor, which can ensure that the motor is protected, reduce the use of nitrogen and save the cost.

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

a sealing structure for a magnetic levitation motor, comprising:

a rotating shaft;

the outer cover assembly comprises an outer cover and a sealing element which are coaxially arranged, the sealing element is sleeved on the rotating shaft and is positioned between the rotating shaft and the outer cover, and a first gap is formed between the sealing element and the rotating shaft;

a first through hole and a second through hole which are communicated with the first gap are formed in the sealing element, the first through hole is communicated with a nitrogen gas source, the second through hole is used for exhausting gas, and the first through hole is far away from a rotor of the sealing structure for the magnetic suspension motor relative to the second through hole;

the bearing assembly is sleeved on the rotating shaft and located between the second through hole and the rotor, an accommodating cavity is formed between the bearing assembly and the outer cover and communicated with the first gap and the outside atmosphere;

the oil thrower is characterized by further comprising an oil thrower disc located in the containing cavity, the oil thrower disc is fixedly sleeved on the rotating shaft, a fan blade is arranged on the oil thrower disc, and the fan blade can rotate to drive gas in the containing cavity to be conveyed to the outside.

Furthermore, the oil thrower further comprises a locking nut, wherein the locking nut is in threaded connection with the rotating shaft, and the oil thrower is pressed on the bearing assembly along the axial direction of the rotating shaft by the locking nut.

Furthermore, a baffle is arranged in the accommodating cavity, a second gap is formed between the baffle and the locking nut, the accommodating cavity is divided into a first cavity and a second cavity which are mutually communicated through the second gap by the baffle, the first cavity is communicated with the outside atmosphere, the oil thrower is positioned in the second cavity, and the oil thrower can discharge gas in the second cavity into the first cavity through the second gap.

Further, the bearing assembly includes:

the auxiliary bearing is arranged on the rotating shaft, and one side of the oil thrower disc, which is far away from the sealing piece, is abutted against an inner ring of the auxiliary bearing;

the bearing block is sleeved on the auxiliary bearing and used for fixing the auxiliary bearing, and the baffle is connected with the bearing block;

the bearing keeps off the ring, the bearing keeps off the ring cover and establishes in the pivot, and with auxiliary bearing's outer lane butt, the bearing keeps off the ring with the bearing frame is connected.

Furthermore, the inner edge of the baffle plate is convexly provided with a water accumulation part, and the water accumulation part extends along the axial direction of the rotating shaft and is positioned in the first cavity.

Furthermore, a water collecting groove is formed in the outer peripheral surface of the water accumulating part along the circumferential direction of the water accumulating part.

Furthermore, one side of the oil thrower disc, which is provided with the fan blades, is provided with a plurality of grooves, and one ends of the grooves penetrate through the peripheral surface of the oil thrower disc.

Further, the sealing member includes sleeve and the carbocycle that the coaxial line set up, the sleeve sets up on the dustcoat, the carbocycle sets up on the telescopic inner wall, the sleeve with the carbocycle all overlaps to be located in the pivot and all with the space has between the pivot, first through-hole with the second through-hole is seted up the sleeve is not equipped with the position department of carbocycle.

A magnetic suspension motor is provided with the sealing structure for the magnetic suspension motor.

The invention has the beneficial effects that:

the invention provides a sealing structure for a magnetic suspension motor.A rotating shaft is sleeved with an outer cover and a sealing element, a first gap is formed between the sealing element and the rotating shaft, the sealing element is provided with a first through hole and a second through hole which are communicated with the first gap, the first through hole is communicated with a nitrogen gas source, and the second through hole is used for exhausting; through letting in high-pressure nitrogen gas in first through-hole, high-pressure nitrogen gas effect is in the first clearance between pivot and sealing member, can effectively prevent inside gaseous medium enters into the motor through the first clearance between pivot and the sealing member, guarantees pivot steady operation. Because be provided with the sealing member between pivot and the enclosing cover, the sealing member has reduced the interval between pivot and the enclosing cover, just needs a small amount of nitrogen gas to play the gaseous effect of separation through letting in high-pressure nitrogen gas in first clearance, can reduce the use of nitrogen gas, when protecting the motor, saves the cost.

The magnetic suspension motor provided by the invention is provided with the sealing structure for the magnetic suspension motor, so that the use of nitrogen can be reduced and the cost can be saved while the motor is protected.

Drawings

Fig. 1 is a sectional view of a sealing structure for a magnetic levitation motor of the present invention;

FIG. 2 is a front view of an oil slinger in the sealing structure for the magnetic suspension motor of the present invention;

FIG. 3 is a front view of a bearing retainer ring in the sealing structure for the magnetic levitation motor according to the present invention;

fig. 4 is a sectional view of a baffle plate in the sealing structure for the magnetic levitation motor of the present invention.

In the figure:

1. a rotating shaft; 2. a seal member; 21. a connecting flange; 22. a first through hole; 23. a second through hole; 3. an auxiliary bearing; 4. an oil slinger; 41. a fan blade; 5. locking the nut; 6. an outer cover; 7. a bearing seat; 71. a bearing retainer ring; 72. a baffle plate; 73. a water accumulation part; 731. a water collection tank; 8. an accommodating cavity.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In order to ensure that the motor is protected, reduce the use of nitrogen and save the cost, as shown in fig. 1-4, the invention provides a sealing structure for a magnetic suspension motor. This seal structure for magnetic levitation motor includes: a rotating shaft 1 and an outer cover assembly.

The outer cover assembly comprises an outer cover 6 and a sealing element 2 which are fixedly arranged coaxially, the sealing element 2 is sleeved on the rotating shaft 1 and is positioned between the rotating shaft 1 and the outer cover 6, and a first gap is formed between the sealing element 2 and the rotating shaft 1; a first through hole 22 and a second through hole 23 which are communicated with the first gap are formed in the sealing element 2, the first through hole 22 is communicated with a nitrogen gas source, the second through hole 23 is used for exhausting, and the first through hole 22 is far away from a rotor of the sealing structure for the magnetic suspension motor relative to the second through hole 23.

Through letting in high-pressure nitrogen gas in first through-hole 22, high-pressure nitrogen gas is used in the first clearance between pivot 1 and sealing member 2, can effectively prevent outside gaseous medium to enter into inside the motor through the first clearance between pivot 1 and the sealing member 2, guarantees pivot 1 steady operation. Because be provided with sealing member 2 between pivot 1 and the enclosing cover 6, sealing member 2 has reduced the interval between pivot 1 and the enclosing cover 6, just needs a small amount of nitrogen gas to play the effect of the outside gas medium of separation through let in high-pressure nitrogen gas in first clearance, can reduce the use of nitrogen gas, when protecting the motor, saves the cost.

Furthermore, the sealing structure for the magnetic suspension motor further comprises a bearing assembly, the bearing assembly is sleeved on the rotating shaft 1 and is positioned between the second through hole 23 and the rotor, an accommodating cavity 8 is formed between the bearing assembly and the outer cover 6, and the accommodating cavity 8 is communicated with the first gap and is communicated with the outside atmosphere; the bearing assembly is used for ensuring the smoothness of the rotation of the rotating shaft 1, and even if a small amount of gas medium passes through the first gap, the gas medium enters the accommodating cavity 8 and is discharged from the accommodating cavity 8.

Furthermore, an oil thrower 4 is arranged in the accommodating cavity 8, the oil thrower 4 is fixedly sleeved on the rotating shaft 1, a fan blade 41 is arranged on the oil thrower 4, and the fan blade 41 rotates to drive the gas in the accommodating cavity 8 to be conveyed to the outside. Specifically, the oil thrower 4 forms wind pressure when rotating along with the rotating shaft 1, so as to block a small amount of gas medium leaking in through the first gap between the sealing element 2 and the rotating shaft 1 from continuing to flow towards the rotor, and blow the part of gas medium into the accommodating cavity 8, and then convey the part of gas medium to the outside through the accommodating cavity 8. Through the arrangement, the sealing performance can be further improved, the motor is guaranteed not to be corroded by gas media, and therefore the service life of the magnetic suspension motor is prolonged.

Further, this seal structure for magnetic levitation motor still includes lock nut 5, and lock nut 5 spiro union is in pivot 1, along the axial of pivot 1, and lock nut 5 compresses tightly oil thrower dish 4 in the bearing subassembly. Through setting up lock nut 5, guarantee oil thrower dish 4 and bearing assembly butt, prevent bearing assembly and oil thrower dish 4 along the axial float of pivot 1 on pivot 1.

Further, a baffle plate 72 is arranged in the accommodating cavity 8, a second gap is formed between the baffle plate 72 and the locking nut 5, the accommodating cavity 8 is divided into a first cavity and a second cavity which are communicated with each other through the second gap by the baffle plate 72, the first cavity is communicated with the outside atmosphere, the oil thrower plate 4 is located in the second cavity, and the oil thrower plate 4 can discharge gas in the second cavity into the first cavity through the second gap. Specifically, the baffle 72 is connected with the bearing assembly, and the bearing assembly can be protected by the baffle 72, so that a gas medium is prevented from entering gaps of the bearing assembly to corrode the bearing assembly. In this embodiment, the material of the baffle 72 is stainless steel, which can prevent the baffle 72 from being corroded by the gas medium.

Further, the inner edge of the baffle 72 is convexly provided with a water accumulating part 73, and the water accumulating part 73 extends along the axial direction of the rotating shaft 1 and is positioned in the first chamber. Through setting up ponding portion 73 for ponding that produces in first cavity slides down to ponding portion 73 on the effect of gravity along the surface of baffle 72, can not directly flow to and cause the corruption to pivot 1 on the pivot 1.

Further, a water collecting groove 731 is formed on the outer circumferential surface of the water accumulating portion 73 along the circumferential direction of the water accumulating portion 73. When the corrosive gaseous medium combines with the water in the air to form a liquid in the first chamber, the liquid falls down along the baffle 72 to the water collection tank 731, and then falls down to the bottom of the magnetic levitation motor along the water collection tank 731. With the above arrangement, the liquid can be prevented from flowing onto the rotating shaft 1, thereby protecting the rotating shaft 1 from corrosion.

Further, one side of the oil slinger 4 provided with the fan blades 41 is provided with a plurality of grooves, and one ends of the grooves penetrate through the peripheral surface of the oil slinger 4. When a corrosive gaseous medium is contained in the first chamber to combine with water in the air to form a liquid, part of the liquid enters the second chamber along the second gap between the baffle plate 72 and the lock nut 5 and accumulates in the groove of the oil thrower 4, thereby preventing corrosion of the bearing assembly.

Further, the bearing assembly includes: auxiliary bearing 3, bearing seat 7 and bearing retainer ring 71.

The auxiliary bearing 3 is arranged on the rotating shaft 1, and one side of the oil thrower 4, which is far away from the sealing piece 2, is abutted against the inner ring of the auxiliary bearing 3; the bearing seat 7 is sleeved on the auxiliary bearing 3 and used for fixing the auxiliary bearing 3, and the baffle plate 72 is connected with the bearing seat 7; the bearing retaining ring 71 is sleeved on the rotating shaft 1 and is abutted against the outer ring of the auxiliary bearing 3, and the bearing retaining ring 71 is connected with the bearing seat 7. Can guarantee the pivoted smoothness nature of pivot 1 through setting up auxiliary bearing 3, fix a position auxiliary bearing 3 through bearing frame 7, oil thrower dish 4 and bearing retainer ring 71, guarantee that auxiliary bearing 3 does not change in the epaxial position of pivot 1.

Further, the bearing retainer ring 71 has a tapered guide surface, the guide surface is located in the second chamber, an inner ring of the guide surface is close to the rotating shaft 1, an outer ring of the guide surface is far away from the rotating shaft 1 and is abutted to the baffle plate 72, and a plurality of communication holes are arranged on the baffle plate 72 at intervals along the circumferential direction of the baffle plate 72 and connect the first chamber and the second chamber. Liquid accumulated in the groove of the oil thrower disc 4 can be thrown onto the bearing baffle ring 71 along with the rotation of the oil thrower disc 4, flows to the outer ring abutted against the baffle plate 72 from the inner ring along the guide surface of the bearing baffle ring 71, and then enters the accumulated water part 73 of the first chamber through the communication hole, so that accumulated water on the oil thrower disc 4 is discharged.

Further, sealing member 2 includes sleeve and the carbocycle that the coaxial line set up, and the sleeve setting is on enclosing cover 6, and the carbocycle setting is on telescopic inner wall, and pivot 1 is all located to charcoal ring and sleeve cover, and all and the pivot 1 between have a space, and the space between charcoal ring and sleeve and the pivot 1 constitutes first clearance, and first through-hole 22 and second through-hole 23 are seted up in the sleeve and are not equipped with the position department of carbocycle. Specifically, the present embodiment exemplarily shows that two carbon rings are arranged at intervals in the axial direction of the sleeve, and the first through hole 22 and the second through hole 23 are respectively arranged on both sides of one of the carbon rings. Optionally, one end of the sleeve is provided with a connecting flange 21, and the sleeve is disposed on the outer cover 6 and fixedly connected with the outer cover 6 through the connecting flange 21. In this embodiment, the sleeve is made of spring steel, and after the sleeve is arranged on the outer cover 6, the sleeve can be expanded with the outer cover 6 under the action of self restoring force, so that the tightness of connection between the sleeve and the outer cover 6 is ensured. The carbon ring is arranged on the inner wall of the sleeve, so that the gas medium can be absorbed, the concentration of the gas medium is further reduced, and the protection strength of the magnetic suspension motor is improved.

In order to facilitate the installation and the disassembly of the carbon ring, furthermore, a positioning ring groove is formed in the inner wall of the sleeve, and the carbon ring is arranged in the positioning ring groove. When the carbon ring is used for a period of time and loses efficacy, the carbon ring is only required to be taken down from the positioning ring groove and replaced by a new carbon ring. Through the arrangement, the magnetic suspension motor is conveniently maintained, so that the service life of the magnetic suspension motor is prolonged.

The embodiment also provides a magnetic suspension motor, which is provided with the sealing structure for the magnetic suspension motor, so that the nitrogen can be reduced while the motor is protected, and the cost is saved.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. a magnetic levitation motor sealing structure, is characterized in that, comprises:

shaft(1);

An outer cover assembly, comprising a coaxially arranged outer cover (6) and a sealing member (2), the sealing member (2) being sleeved on the rotating shaft (1) and located between the rotating shaft (1) and the Between the outer covers (6), a first gap exists between the seal (2) and the rotating shaft (1);

The sealing member (2) is provided with a first through hole (22) and a second through hole (23) that communicate with the first gap, and the first through hole (22) is communicated with the nitrogen gas source, so The second through hole (23) is used for exhaust gas, and the first through hole (22) is relatively far away from the rotor of the magnetic levitation motor sealing structure relative to the second through hole (23);

Also includes a bearing assembly, the bearing assembly is sleeved on the rotating shaft (1), the bearing assembly is located between the second through hole (23) and the rotor, the bearing assembly and the outer cover (6) An accommodating cavity (8) is formed therebetween, and the accommodating cavity (8) is communicated with the first gap and communicated with the outside atmosphere;

It also includes an oil slinger (4) located in the accommodating cavity (8), the oil slinger (4) is fixedly sleeved on the rotating shaft (1), and the oil slinger (4) is provided with A fan blade (41) is provided, and the rotation of the fan blade (41) can drive the gas in the accommodating cavity (8) to be transported to the outside.

2 . The sealing structure for a magnetic levitation motor according to claim 1 , further comprising a locking nut ( 5 ), the locking nut ( 5 ) being screwed on the rotating shaft ( 1 ) and extending along the In the axial direction of the rotating shaft (1), the locking nut (5) presses the oil slinger (4) against the bearing assembly.

3 . The sealing structure for a magnetic levitation motor according to claim 2 , wherein a baffle plate ( 72 ) is arranged in the accommodating cavity ( 8 ), and the baffle plate ( 72 ) is locked with the lock. 4 . There is a second gap between the nuts (5), and the baffle plate (72) divides the accommodating cavity (8) into a first cavity and a second cavity that communicate with each other through the second gap. The first chamber is communicated with the outside atmosphere, the oil slinger (4) is located in the second chamber, and the oil slinger (4) is capable of passing the gas in the second chamber through the second chamber The gap drains into the first chamber.

4. The sealing structure for a magnetic levitation motor according to claim 3, wherein the bearing assembly comprises:

an auxiliary bearing (3), arranged on the rotating shaft (1), and the side of the oil slinger (4) facing away from the seal (2) is in contact with the inner ring of the auxiliary bearing (3);

A bearing seat (7) is sleeved on the auxiliary bearing (3) for fixing the auxiliary bearing (3), and the baffle plate (72) is connected with the bearing seat (7);

A bearing retaining ring (71), the bearing retaining ring (71) is sleeved on the rotating shaft (1), and is in contact with the outer ring of the auxiliary bearing (3). The bearing seat (7) is connected.

5 . The sealing structure for a magnetic levitation motor according to claim 3 , wherein the inner edge of the baffle plate ( 72 ) is protruded with a water accumulation portion ( 73 ), and the water accumulation portion ( 73 ) extends along the The shaft (1) extends axially and is located in the first chamber.

6 . The sealing structure for a magnetic levitation motor according to claim 5 , wherein a water collecting groove is opened on the outer peripheral surface of the water accumulation part (73) along the circumferential direction of the water accumulation part (73). 7 . (731).

7 . The sealing structure for a magnetic levitation motor according to claim 1 , wherein a plurality of grooves are opened on the side of the oil slinger ( 4 ) on which the fan blades ( 41 ) are arranged, and the One end of the groove penetrates the outer peripheral surface of the oil slinger (4).

8 . The sealing structure for a magnetic levitation motor according to claim 1 , wherein the sealing member ( 2 ) comprises a coaxially arranged sleeve and a carbon ring, and the sleeve is arranged on the outer cover. 9 . (6), the carbon ring is arranged on the inner wall of the sleeve, the sleeve and the carbon ring are both sleeved on the rotating shaft (1) and between the rotating shaft (1) There is a gap, and the first through hole (22) and the second through hole (23) are opened at the position where the sleeve is not provided with the carbon ring.

9 . A magnetic levitation motor, characterized in that, the sealing structure for a magnetic levitation motor according to any one of claims 1 to 8 is arranged thereon.