CN120140468A - An active and passive coupling bearing sealing structure for underwater high-speed rotating machinery - Google Patents

An active and passive coupling bearing sealing structure for underwater high-speed rotating machinery Download PDF

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Publication number
CN120140468A
CN120140468A CN202510553791.9A CN202510553791A CN120140468A CN 120140468 A CN120140468 A CN 120140468A CN 202510553791 A CN202510553791 A CN 202510553791A CN 120140468 A CN120140468 A CN 120140468A
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CN
China
Prior art keywords
sealing structure
active
sealing
passive
bearing
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CN202510553791.9A
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Chinese (zh)
Inventor
温风波
王伟光
佟磊
王松涛
蔡乐
杜鑫
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Harbin Institute Of Technology Suzhou Research Institute
Harbin Institute of Technology
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Harbin Institute of Technology Shenzhen
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Priority to CN202510553791.9A priority Critical patent/CN120140468A/en
Publication of CN120140468A publication Critical patent/CN120140468A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/26—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings
    • F16J15/30—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings with sealing rings made of carbon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/30—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the oil being fed or carried along by another fluid
    • F16N7/32—Mist lubrication
    • F16N7/34—Atomising devices for oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2210/00—Applications
    • F16N2210/14—Bearings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

本发明公开了一种水下高速旋转机械的主被动耦合轴承封严结构，涉及轴承封严技术领域，解决了现有轴承封严结构在水下封严效果较差的问题。本发明包括转轴、基座和封严结构，转轴同轴转动安装于基座内部，转轴和基座之间设置有轴承；基座内设置有供油管路和润滑腔，转轴和基座之间设置有回油管路，供油管路、润滑腔和回油管路依次连通；润滑腔一侧开口并与轴承接触；封严结构包括主动封严结构和被动封严结构，主动封严结构安装在基座内部，被动封严结构套装在转轴上；主动封严结构和供气气源连通，并向主动封严结构和被动封严结构之间的间隙通入气体。本发明通过主动封严和被动封严耦合的方式，提高了水下轴承封严效果。

The present invention discloses an active and passive coupling bearing sealing structure of an underwater high-speed rotating machinery, relates to the technical field of bearing sealing, and solves the problem that the existing bearing sealing structure has a poor underwater sealing effect. The present invention includes a rotating shaft, a base and a sealing structure, the rotating shaft is coaxially installed inside the base, and a bearing is arranged between the rotating shaft and the base; an oil supply pipeline and a lubrication cavity are arranged inside the base, and an oil return pipeline is arranged between the rotating shaft and the base, and the oil supply pipeline, the lubrication cavity and the oil return pipeline are connected in sequence; one side of the lubrication cavity is open and in contact with the bearing; the sealing structure includes an active sealing structure and a passive sealing structure, the active sealing structure is installed inside the base, and the passive sealing structure is mounted on the rotating shaft; the active sealing structure is connected to an air supply source, and gas is introduced into the gap between the active sealing structure and the passive sealing structure. The present invention improves the sealing effect of underwater bearings by coupling active sealing and passive sealing.

Description

Active-passive coupling bearing sealing structure of underwater high-speed rotating machine
Technical Field
The invention relates to the technical field of bearing sealing, in particular to an active-passive coupling bearing sealing structure of an underwater high-speed rotating machine.
Background
The bearing is an indispensable important component in mechanical transmission, and has the main functions of bearing radial load and axial load from the rotating component, providing stable support for the rotating component, enabling the rotating component to rotate stably, reducing friction coefficient between the rotating component and the static component, reducing abrasion between the rotating component and the static component, maintaining rotation precision of the rotating component and the like. However, the lubricating oil of the bearing may leak during high-speed operation of the rotary member. The lubricating oil plays roles of lubricating, cooling, cleaning and the like in the running process of the bearing, so that the running efficiency and the service life of the bearing are improved. Once the lubricating oil leaks, the action effect of the lubricating oil is reduced, the service life of the bearing is affected, and meanwhile, the maintenance frequency and the maintenance cost are increased, so that the bearing needs to be sealed.
The existing bearing sealing structures generally have two types, one type is passive sealing, namely sealing structures such as comb teeth sealing and graphite sealing are adopted. The sealing modes do not need to be actively controlled, and a good sealing effect can be achieved under the normal working state of the mechanical system, and the second mode is that external air is introduced through an air system of the mechanical system, after the external air is compressed, the pressure of the air is increased, high-pressure air is introduced into a bearing sealing cavity, and the air sealing of the bearing is achieved. However, as the power and thrust demands on the subsea rotary mechanical engine gradually increase, a corresponding increase in engine speed is required. The existing sealing structure cannot be applied to an underwater high-speed rotary mechanical engine. Because the engine is under water when working, can't introduce the air from outside, can't carry out the atmoseal of bearing chamber. Meanwhile, because the engine is in a high-speed rotating state when running under water, the traditional graphite sealing structure is a contact type sealing structure, and can be rapidly worn in the high-speed rotating process, so that the sealing effect is affected.
Therefore, a bearing sealing structure is needed, which can be applied to the running process of an underwater high-speed rotary mechanical engine, and can realize sealing of the bearing by actively supplying air to the front of a bearing cavity under the condition that no external air is introduced.
Disclosure of Invention
The invention aims to solve the problem that the conventional bearing sealing structure is poor in underwater sealing effect, and particularly provides an active and passive coupling bearing sealing structure of an underwater high-speed rotating machine. According to the invention, the sealing effect of the underwater bearing is improved in a mode of coupling active sealing and passive sealing.
The invention provides an active and passive coupling bearing sealing structure of an underwater high-speed rotating machine, which specifically comprises a rotating shaft, a base and a sealing structure, wherein the rotating shaft is coaxially and rotatably arranged in the base, a bearing is arranged between the rotating shaft and the base, an oil supply pipeline and a lubricating cavity are arranged in the base, an oil return pipeline is arranged between the rotating shaft and the base, the oil supply pipeline, the lubricating cavity and the oil return pipeline are sequentially communicated, one side of the lubricating cavity is opened and contacted with the bearing, the sealing structure comprises an active sealing structure and a passive sealing structure, the active sealing structure is arranged in the base, the passive sealing structure is sleeved on the rotating shaft, the active sealing structure is communicated with an air supply source, and air is introduced into a gap between the active sealing structure and the passive sealing structure.
Furthermore, the active sealing structure comprises an air supply part, an inner runner of the air supply part is arranged in the air supply part, one side of the inner runner of the air supply part is communicated with an air supply source, and the other side of the inner runner of the air supply part is communicated with a gap between the active sealing structure and the passive sealing structure.
Furthermore, the inner flow passage of the air supply part comprises an annular air passage and a plurality of air outlet holes, one side of the annular air passage is communicated with an air supply source, and the other side of the annular air passage is communicated with the plurality of air outlet holes.
Still further, the passive seal structure includes graphite seal structure, and graphite seal structure one side leans on the bearing, and graphite seal structure includes graphite seal support and graphite sealing ring, and graphite seal support cross-section is the concave type structure, and graphite sealing ring sets up in the recess of graphite seal support.
Still further, the distance between the graphite seal ring and the gas supply member is not more than 0.2mm.
Still further, the passive seal structure still includes the comb tooth structure of sealing, and the comb tooth structure of sealing leans on graphite seal structure one side, is provided with a plurality of comb teeth on the comb tooth structure of sealing.
Further, the number of the comb teeth is more than or equal to 4 and less than or equal to 8.
Further, the distance between the comb teeth and the air supply part is more than or equal to 0.2mm and less than or equal to 0.4mm.
Further, the air outlet hole is arranged between the comb teeth sealing structure and the graphite sealing ring.
Furthermore, an oil nozzle is arranged at the outlet of the oil supply pipeline, and the oil nozzle is opposite to the bearing.
The active-passive coupling bearing sealing structure of the underwater high-speed rotating machine has the beneficial effects that:
(1) The active and passive coupling bearing sealing structure of the underwater high-speed rotating machine solves the problem that the existing bearing sealing structure is poor in underwater sealing effect, and achieves a more efficient bearing sealing effect through the sealing structure of active sealing and passive sealing coupling. When the underwater high-speed rotary mechanical engine works, active sealing is a main sealing means, passive sealing provides additional sealing guarantee for active sealing, the efficiency of active sealing is improved, and meanwhile, the reasonable design of the air supply flow channel and the sealing structure layout enables sealing gas to reach a sealing area more effectively, and the sealing performance is enhanced.
(2) According to the active and passive coupling bearing sealing structure of the underwater high-speed rotating machine, the graphite sealing structure is in contact with the rotor to form the sealing surface, so that the lubricating oil is effectively prevented from leaking from the bearing cavity to the external environment, and the cleaning of the inside of the engine and the normal circulation of the lubricating oil are ensured.
(3) According to the active and passive coupling bearing sealing structure of the underwater high-speed rotating machine, airflow flowing out of the active sealing structure can undergo multiple acceleration and expansion when passing through a gap between the comb teeth and the air supply part, so that pressure and speed energy are gradually reduced. This throttling and thermodynamic effect makes it difficult for the gas to "escape", effectively reducing the leakage of the hydrocarbon flow. Through blocking the leakage of the oil gas flow, the comb teeth are sealed, so that the consumption of lubricating oil is reduced, and the bearing is fully lubricated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
In the drawings:
FIG. 1 is a schematic view of a first structure of a seal structure of an active-passive coupling bearing of an underwater high-speed rotating machine according to the present invention;
FIG. 2 is a schematic view of a second structure of an active-passive coupling bearing seal structure of an underwater high-speed rotary machine according to the present invention;
FIG. 3 is a schematic diagram of gas flow at the gas outlet of the sealing structure of the active and passive coupling bearing of the underwater high-speed rotating machine;
FIG. 4 is a perspective view of an air supply part of an active-passive coupled bearing seal structure of an underwater high-speed rotary machine according to the present invention;
FIG. 5 is a cross-sectional view of an air supply part of an active-passive coupled bearing seal structure of an underwater high-speed rotary machine according to the present invention;
FIG. 6 is a schematic perspective view of a sealing structure of a comb teeth of a sealing structure of an active and passive coupling bearing of an underwater high-speed rotating machine;
FIG. 7 is a side view of a labyrinth seal structure of an active and passive coupling bearing seal structure of an underwater high-speed rotating machine according to the present invention;
FIG. 8 is a side view of a graphite seal structure of an active and passive coupling bearing seal structure of an underwater high-speed rotating machine according to the present invention;
FIG. 9 is a schematic perspective view of a graphite seal structure of an active-passive coupling bearing seal structure of an underwater high-speed rotating machine according to the present invention;
The device comprises a 1-air supply source, a 2-air supply valve, a 3-external air supply pipeline, a 4-internal air supply runner, a 5-oil supply pipeline, a 6-oil nozzle, a 7-oil return pipeline, an 8-rotating shaft, a 9-bearing, a 10-graphite sealing support, an 11-graphite sealing ring, a 12-comb seal structure, a 13-air supply part inner runner, a 14-air supply part and a 15-base.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention disclosed herein without departing from the scope of the invention.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the creation of the present invention will be understood in a specific case by those skilled in the art.
In addition, the technical features which are described below and which are involved in the various embodiments of the invention can be combined with one another as long as they do not conflict with one another.
Detailed description of the embodiments first, this embodiment is described in detail with reference to fig. 1 to 9. The active and passive coupling bearing sealing structure of the underwater high-speed rotating machine comprises a rotating shaft 8, a base 15 and a sealing structure, wherein the rotating shaft 8 is coaxially installed inside the base 15 in a rotating mode, a bearing 9 is arranged between the rotating shaft 8 and the base 15, an oil supply pipeline 5 and a lubricating cavity are arranged in the base 15, an oil return pipeline 7 is arranged between the rotating shaft 8 and the base 15, the oil supply pipeline 5, the lubricating cavity and the oil return pipeline 7 are sequentially communicated, one side of the lubricating cavity is opened and is in contact with the bearing 9, an oil spray nozzle 6 is arranged at an outlet of the oil supply pipeline 5, the oil spray nozzle 6 is opposite to the bearing 9, oil is sprayed out of the oil spray nozzle 6 to lubricate the bearing 9, the active sealing structure and the passive sealing structure are installed inside the base 15, the passive sealing structure is sleeved on the rotating shaft 8, the active sealing structure is communicated with an air supply source 1, and air is introduced into a gap between the active sealing structure and the passive sealing structure.
The active sealing structure comprises an air supply part 14, wherein the air supply part 14 is of an annular structure, the air supply part 14 and a rotating shaft 8 are coaxial and are arranged in a base 15, an air supply part inner flow passage 13 is arranged in the air supply part 14, the air supply part inner flow passage 13 is of an annular structure, one side of the air supply part inner flow passage 13 is communicated with an air supply source 1 through an inner air supply flow passage 4, an outer air supply pipeline 3 and the air supply source 1, air is introduced into a gap between the other side of the active sealing structure and the passive sealing structure, and an air source valve 2 is arranged on the outer air supply pipeline 3.
The air supply part inner runner 13 comprises an annular air passage and a plurality of air outlet holes; the annular air passage is coaxial with the rotating shaft 8, one side of the annular air passage is communicated with the air supply source 1, the other side is communicated with a plurality of air outlet holes which are uniformly arranged, the outlet of the air outlet is directed to the axis of the rotating shaft 8.
The passive sealing structure comprises a graphite sealing structure, wherein the graphite sealing structure is coaxially sleeved on a rotating shaft 8 and synchronously rotates along with the rotating shaft 8, one side of the graphite sealing structure leans against a bearing 9, the graphite sealing structure comprises a graphite sealing support 10 and a graphite sealing ring 11, the cross section of the graphite sealing support 10 is of a concave structure, the graphite sealing ring 11 is arranged in a groove of the graphite sealing support 10, the graphite sealing ring 11 is in contact with an air supply part 14 above to form a sealing surface, the graphite sealing ring 11 is made of carbon graphite or antimony-impregnated graphite, the graphite sealing support 10 is formed by splicing two annular structures, one annular structure is L-shaped, the other annular structure is L-shaped, and the material is metal and is used for supporting and fixing the graphite sealing ring 11.
The distance between the graphite seal ring 11 and the air supply member 14 is not more than 0.2mm.
The passive sealing structure further comprises a comb tooth sealing structure 12, the comb tooth sealing structure 12 is of an annular structure and coaxially installed on the rotating shaft 8 to synchronously rotate along with the rotating shaft 8, the comb tooth sealing structure 12 leans against one side of the graphite sealing structure, a plurality of comb teeth are arranged on the comb tooth sealing structure 12 and are of an annular structure, the plurality of comb teeth are of a certain height and are arranged at equal intervals, and sealing gaps are formed between the comb teeth and the upper air supply part 14.
The number of the comb teeth is more than or equal to 4 and less than or equal to 8. The distance between the comb teeth and the air supply part 14 is more than or equal to 0.2mm and less than or equal to 0.4mm, the size of the gap has an important influence on the sealing performance, the too large gap can cause air leakage to increase, and the too small gap can cause friction.
The air outlet hole is arranged between the comb teeth sealing structure 12 and the graphite sealing ring 11.
The invention relates to a main and passive coupling bearing sealing structure of an underwater high-speed rotating machine, which comprises the following specific working principles:
As shown in fig. 1, when the engine is operated under water, the lubricating oil reaches the oil spray nozzle 6 through the engine lubricating oil supply pipeline 5, and is conveyed into the bearing cavity for lubricating the bearing 9, and the excessive lubricating oil returns to the lubricating oil tank through the oil return pipeline 7. At this time, the air source valve 2 is actively opened, and the high-pressure air in the air supply source 1 is supplied into the engine through the external air supply pipeline 3 of the engine. After the high-pressure gas enters the engine, the high-pressure gas enters the active air supply flow passage 13 in the bearing front end air supply part through the inner air supply flow passage 4. The cross-sectional shape and the pipe length of the engine external active air supply pipe 3 and the engine internal active air supply flow passage 4 should be designed according to the minimum pressure loss criterion. Finally, the high-pressure gas enters the bearing sealing cavity through the outlet of the inner flow channel 13 of the gas supply part, so that the bearing 9 is actively sealed.
The graphite sealing structure is a contact type seal, but in the running process of the engine, the graphite sealing ring 11 will rub against the upper air supply part 14, so that the graphite sealing ring 11 is worn, a gap is formed between the graphite sealing ring 11 and the air supply part 14 at the front end of the bearing, and the lubricating oil is leaked, so that an active sealing structure needs to be introduced. The comb teeth and the lower surface of the air supply part at the front end of the bearing form a sealing gap, the size of the gap has an important influence on the sealing performance, the too large gap can cause air leakage to increase, and the too small gap can cause friction. As the air flow passes through the gap between the grate and the air supply 14, it undergoes multiple accelerations and expansions, resulting in a gradual decrease in pressure and velocity energy. This throttling effect makes it difficult for the gas to "escape", effectively reducing the loss of blow-by gas.
The outlet of the inner runner 13 of the air supply part is arranged between the comb teeth sealing structure 12 and the graphite sealing ring 11, and the graphite sealing ring 11 is close to one side of the bearing 9, and the comb teeth sealing structure 12 is far away from one side of the bearing 9. After the gas flows out from the outlet of the inner runner 13 of the gas supply part, one part of the gas flows to one side of the bearing 9 to provide sealing pressure for the sealing cavity of the bearing, and the other part of the gas flows to one side of the sealing structure 12 of the comb teeth due to lower pressure of the engine cavity outside the sealing structure 12 of the comb teeth, so that the gas leaks to the external cavity. The structure can exert the functions of the comb teeth sealing structure 12 and the graphite sealing ring 11 simultaneously, namely, leakage of sealing gas to the outside of an active gas supply runner outlet is reduced through the comb teeth sealing structure 12, pressure of the sealing gas on a sealing surface between the graphite sealing ring 11 and a bearing front end gas supply part 14 is ensured, and active and passive coupling sealing is better realized.
The pressure of the air supply source 1 can be adjusted by the opening of the air supply valve 2, and the pressure of the air supply source 1 needs to meet the condition that the pressure of the air reaching the bearing sealing cavity is larger than the pressure of the bearing cavity, so that the standard of preventing lubricating oil leakage is achieved. After the gas enters the inlet of the inner runner 13 of the gas supply part, the gas enters the annular air passage along with the inlet, and the gas flows along the annular air passage at the moment, so that the gas is uniformly distributed in the circumferential direction. Then, the gas flows out from the gas outlet holes evenly distributed along the circumferential direction below the annular gas passage, reaches the bearing sealing cavity, and avoids the occurrence of leakage of lubricating oil at local positions along the circumferential direction of the bearing 9.
Summarizing the above embodiment, the active-passive coupling bearing sealing structure of the underwater high-speed rotating machine solves the problem that the existing bearing sealing structure is poor in underwater sealing effect, and achieves a more efficient bearing sealing effect through the sealing structure of coupling active sealing and passive sealing. When the underwater high-speed rotary mechanical engine works, active sealing is a main sealing means, passive sealing provides additional sealing guarantee for active sealing, the efficiency of active sealing is improved, and meanwhile, the reasonable design of the air supply flow channel and the sealing structure layout enables sealing gas to reach a sealing area more effectively, and the sealing performance is enhanced. According to the active and passive coupling bearing sealing structure of the underwater high-speed rotating machine, the graphite sealing structure is in contact with the rotor to form the sealing surface, so that the lubricating oil is effectively prevented from leaking from the bearing cavity to the external environment, and the cleaning of the inside of the engine and the normal circulation of the lubricating oil are ensured. According to the active and passive coupling bearing sealing structure of the underwater high-speed rotating machine, air flow flowing out of the active sealing structure can be subjected to multiple acceleration and expansion when passing through a gap between the comb teeth and the air supply part 14, so that pressure and speed energy are gradually reduced. This throttling and thermodynamic effect makes it difficult for the gas to "escape", effectively reducing the leakage of the hydrocarbon flow. Through blocking the leakage of the oil gas flow, the comb teeth are sealed, so that the consumption of lubricating oil is reduced, and the bearing is fully lubricated.
The above specific embodiments are used for further detailed description of the objects, technical solutions and advantageous effects of the present invention. It should be understood that the foregoing description is only a specific example of the present invention, and is not intended to limit the invention, but rather is a reasonable combination of features described in the foregoing embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1.一种水下高速旋转机械的主被动耦合轴承封严结构，其特征在于：包括转轴(8)、基座(15)和封严结构，转轴(8)同轴转动安装于基座(15)内部，转轴(8)和基座(15)之间设置有轴承(9)；基座(15)内设置有供油管路(5)和润滑腔，转轴(8)和基座(15)之间设置有回油管路(7)，供油管路(5)、润滑腔和回油管路(7)依次连通；润滑腔一侧开口并与轴承(9)接触；封严结构包括主动封严结构和被动封严结构，主动封严结构安装在基座(15)内部，被动封严结构套装在转轴(8)上；主动封严结构和供气气源(1)连通，并向主动封严结构和被动封严结构之间的间隙通入气体。1. An active and passive coupling bearing sealing structure of an underwater high-speed rotating machinery, characterized in that it comprises a rotating shaft (8), a base (15) and a sealing structure, wherein the rotating shaft (8) is coaxially rotatably mounted inside the base (15), and a bearing (9) is arranged between the rotating shaft (8) and the base (15); an oil supply pipeline (5) and a lubrication cavity are arranged inside the base (15), and an oil return pipeline (7) is arranged between the rotating shaft (8) and the base (15), and the oil supply pipeline (5), the lubrication cavity and the oil return pipeline (7) are connected in sequence; one side of the lubrication cavity is open and contacts with the bearing (9); the sealing structure comprises an active sealing structure and a passive sealing structure, the active sealing structure is mounted inside the base (15), and the passive sealing structure is sleeved on the rotating shaft (8); the active sealing structure is connected to an air supply source (1), and gas is introduced into the gap between the active sealing structure and the passive sealing structure. 2.根据权利要求1所述的水下高速旋转机械的主被动耦合轴承封严结构，其特征在于：所述主动封严结构包括供气部件(14)，供气部件(14)内部设置有供气部件内流道(13)；供气部件内流道(13)一侧和供气气源(1)连通，另一侧向主动封严结构和被动封严结构之间的间隙通入气体。2. The active and passive coupling bearing sealing structure of the underwater high-speed rotating machinery according to claim 1 is characterized in that: the active sealing structure includes an air supply component (14), and an air supply component internal flow channel (13) is arranged inside the air supply component (14); one side of the air supply component internal flow channel (13) is connected to the air supply source (1), and the other side allows gas to be introduced into the gap between the active sealing structure and the passive sealing structure. 3.根据权利要求2所述的水下高速旋转机械的主被动耦合轴承封严结构，其特征在于：所述供气部件内流道(13)包括环形气道和若干出气孔；环形气道一侧和供气气源(1)连通，另一侧和若干出气孔连通。3. The active and passive coupling bearing sealing structure of the underwater high-speed rotating machinery according to claim 2 is characterized in that: the inner flow channel (13) of the air supply component includes an annular air channel and a plurality of air outlets; one side of the annular air channel is connected to the air supply source (1), and the other side is connected to the plurality of air outlets. 4.根据权利要求3所述的水下高速旋转机械的主被动耦合轴承封严结构，其特征在于：所述被动封严结构包括石墨密封结构，石墨密封结构一侧靠在轴承(9)上，石墨密封结构包括石墨密封支座(10)和石墨密封环(11)，石墨密封支座(10)截面为凹字型结构，石墨密封环(11)设置于石墨密封支座(10)的凹槽中。4. The active and passive coupling bearing sealing structure of the underwater high-speed rotating machinery according to claim 3 is characterized in that: the passive sealing structure includes a graphite sealing structure, one side of the graphite sealing structure leans against the bearing (9), the graphite sealing structure includes a graphite sealing support (10) and a graphite sealing ring (11), the cross-section of the graphite sealing support (10) is a concave structure, and the graphite sealing ring (11) is arranged in the groove of the graphite sealing support (10). 5.根据权利要求4所述的水下高速旋转机械的主被动耦合轴承封严结构，其特征在于：所述石墨密封环(11)和供气部件(14)之间的距离不大于0.2mm。5. The active and passive coupling bearing sealing structure of the underwater high-speed rotating machinery according to claim 4 is characterized in that the distance between the graphite sealing ring (11) and the air supply component (14) is not greater than 0.2 mm. 6.根据权利要求4所述的水下高速旋转机械的主被动耦合轴承封严结构，其特征在于：所述被动封严结构还包括篦齿封严结构(12)，篦齿封严结构(12)靠在石墨密封结构一侧，篦齿封严结构(12)上设置有若干篦齿。6. The active and passive coupling bearing sealing structure of the underwater high-speed rotating machinery according to claim 4 is characterized in that: the passive sealing structure also includes a comb tooth sealing structure (12), the comb tooth sealing structure (12) is close to one side of the graphite sealing structure, and a plurality of comb teeth are arranged on the comb tooth sealing structure (12). 7.根据权利要求6所述的水下高速旋转机械的主被动耦合轴承封严结构，其特征在于：所述篦齿数量大于等于4，小于等于8。7. The active and passive coupling bearing sealing structure of the underwater high-speed rotating machinery according to claim 6, characterized in that the number of the comb teeth is greater than or equal to 4 and less than or equal to 8. 8.根据权利要求6所述的水下高速旋转机械的主被动耦合轴承封严结构，其特征在于：所述篦齿和供气部件(14)之间的距离大于等于0.2mm，小于等于0.4mm。8. The active and passive coupling bearing sealing structure of the underwater high-speed rotating machinery according to claim 6 is characterized in that the distance between the comb teeth and the air supply component (14) is greater than or equal to 0.2 mm and less than or equal to 0.4 mm. 9.根据权利要求6所述的水下高速旋转机械的主被动耦合轴承封严结构，其特征在于：所述出气孔设置于篦齿封严结构(12)和石墨密封环(11)之间。9. The active and passive coupling bearing sealing structure of underwater high-speed rotating machinery according to claim 6, characterized in that the air outlet is arranged between the comb teeth sealing structure (12) and the graphite sealing ring (11). 10.根据权利要求1所述的水下高速旋转机械的主被动耦合轴承封严结构，其特征在于：所述供油管路(5)出口设置有喷油嘴(6)，喷油嘴(6)正对轴承(9)。10. The active and passive coupling bearing sealing structure of underwater high-speed rotating machinery according to claim 1, characterized in that: an oil nozzle (6) is provided at the outlet of the oil supply pipeline (5), and the oil nozzle (6) is directly facing the bearing (9).
CN202510553791.9A 2025-04-29 2025-04-29 An active and passive coupling bearing sealing structure for underwater high-speed rotating machinery Pending CN120140468A (en)

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