CN113309616A - Sealing structure for bearing of compressor - Google Patents
Sealing structure for bearing of compressor Download PDFInfo
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- CN113309616A CN113309616A CN202110586825.6A CN202110586825A CN113309616A CN 113309616 A CN113309616 A CN 113309616A CN 202110586825 A CN202110586825 A CN 202110586825A CN 113309616 A CN113309616 A CN 113309616A
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- 238000007789 sealing Methods 0.000 title claims abstract description 311
- 239000010687 lubricating oil Substances 0.000 claims abstract description 42
- 239000003921 oil Substances 0.000 claims abstract description 37
- 230000000903 blocking effect Effects 0.000 claims description 21
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/28—Arrangement of seals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
- F04D29/104—Shaft sealings especially adapted for elastic fluid pumps the sealing fluid being other than the working fluid or being the working fluid treated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/122—Shaft sealings using sealing-rings especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a compressor bearing sealing structure, which comprises: the wheel disc shaft, the bearing seat sleeved on the wheel disc shaft, the bearing fixedly arranged on the excircle of the wheel disc shaft and positioned in the bearing seat, the first sealing member, the second sealing member and the third sealing member. The first sealing component is fixed in the second sealing component and abuts against the leakage end of the bearing so as to prevent part of lubricating oil leaked from the bearing from flowing to the air flow channel of the compressor. And a gap between the oil outlet side of the second sealing member and the third sealing member forms an air pressure cavity communicated with external air flow so as to enable the two sides of the second sealing member to form pressure difference, and further enable the second sealing member to form a second sealing for sealing the lubricating oil discharged by the first sealing member. The third sealing component is used for keeping the pressure difference of the air pressure cavity and forming a third sealing for sealing the lubricating oil discharged by the second sealing component. The sealing structure of the compressor bearing can improve the installation adaptability and the lubricating oil sealing effect of the sealing structure.
Description
Technical Field
The invention relates to the field of lubricating oil sealing devices, in particular to a compressor bearing sealing structure.
Background
In order to prevent lubricating oil at the bearing end of the compressor of a certain turboprop engine from leaking into the airflow channel of the compressor, a sealing device needs to be designed at the bearing to meet the sealing requirement of the bearing, if the sealing performance is poor, the lubricating oil can leak into the airflow channel of the compressor, and the lubricating effect of a shaft and parts on the shaft cannot be ensured, so that great hidden danger is brought to the safe use of the engine.
The sealing at the bearing end of the existing compressor generally adopts a piston ring or graphite labyrinth structure, and the installation adaptability and the sealing performance of the bearing end are poor, so that the working reliability of the bearing end is influenced.
Disclosure of Invention
The invention provides a compressor bearing sealing structure, which aims to solve the technical problems of poor bearing end installation adaptability and poor sealing performance of the conventional sealing device.
The technical scheme adopted by the invention is as follows:
a compressor bearing seal structure comprising: the wheel disc shaft, the bearing seat sleeved on the wheel disc shaft, the bearing fixedly arranged on the excircle of the wheel disc shaft and positioned in the bearing seat, the first sealing member, the second sealing member and the third sealing member are uniformly distributed on the leakage side of lubricating oil of the bearing; the first sealing component is fixed in the second sealing component and abuts against the leakage end of the bearing so as to prevent part of lubricating oil leaked from the bearing from flowing to the air flow channel of the compressor; a gap between the oil outlet side of the second sealing component and the third sealing component forms an air pressure cavity communicated with external air flow so as to enable two sides of the second sealing component to form pressure difference and further enable the second sealing component to form a second sealing for sealing lubricating oil discharged by the first sealing component; the third sealing component is used for keeping the pressure difference of the air pressure cavity and forming a third sealing for sealing the lubricating oil discharged by the second sealing component.
Furthermore, the bearing seat is cylindrical, the first end of the bearing seat is fixed with the casing, and the opposite second end of the bearing seat is recessed inwards to form a bearing cavity for mounting a bearing; the first end of bearing supports to lean on the chamber end spacing of bearing chamber, and the excircle facial make-up of bearing is equipped with an elastic mounting section of thick bamboo group, and the bearing clamps in the bearing chamber through an elastic mounting section of thick bamboo group.
Further, the elastic mounting cylinder group comprises an elastic inner cylinder and an elastic outer cylinder which are used for absorbing vibration energy and reducing the supporting rigidity of the rotor; the elastic inner cylinder is sleeved on the excircle of the bearing and connected with the bearing block to perform angular positioning; the elastic outer cylinder is sleeved on the excircle of the elastic inner cylinder and clamped in the bearing cavity, and the elastic outer cylinder and the elastic inner cylinder are connected into a whole.
Furthermore, the elastic inner cylinder is in a hollow cylinder shape, a first end of the elastic inner cylinder, which is close to the bottom of the cavity of the bearing cavity, is provided with a first end tooth which protrudes outwards, the first end tooth is inserted into the bearing seat along the axial direction, and an outer circle of a second end of the elastic inner cylinder is provided with a connecting flange which protrudes outwards; the elastic outer cylinder is in a hollow cylinder shape, bosses which protrude outwards and are arranged in a staggered mode are arranged on the inner circumferential surface and the outer circumferential surface of the elastic outer cylinder respectively, second end teeth which protrude outwards are arranged at the second end, close to the connecting flange, of the elastic outer cylinder, and the second end teeth are inserted into the connecting flange along the axial direction.
Furthermore, the first sealing component comprises an annular oil blocking ring, and the oil blocking ring is fixed in the second sealing component and abuts against the leakage end of the bearing; the first end of the oil blocking ring close to the bearing is recessed to form an annular oil blocking cavity for blocking part of lubricating oil leaked out of the bearing.
Further, the second sealing member comprises a sealing bush fixedly sleeved on the outer circle of the wheel disc shaft and an inner sealing ring sleeved on the sealing bush; the oil inlet side of the sealing bush is abutted against the bearing for limiting; the oil inlet side of the inner sealing ring is respectively abutted against the second ends of the bearing and the bearing seat for limitation and is fixed with the bearing seat, and the inner sealing ring is in clearance fit with the sealing bush to form a second seal for sealing lubricating oil discharged by the first sealing member.
Furthermore, the sealing bush is in a hollow cylinder shape, and the peripheral surface of the sealing bush is a labyrinth surface for sealing; the inner sealing ring is in a hollow cylinder shape, and the inner peripheral surface of the inner sealing ring and the labyrinth surface of the sealing bush form a sealing structure for sealing lubricating oil discharged from the oil blocking and isolating ring; the oil blocking spacer ring is arranged in a gap between the oil inlet sides of the sealing bush and the inner sealing ring, and the outer peripheral surface of the oil blocking spacer ring is fixed on the inner peripheral wall of the inner sealing ring in a punching and riveting mode.
Further, an air inlet channel for introducing external air flow into the air pressure cavity is further arranged in the compressor bearing sealing structure; the air inlet end of the air inlet channel is communicated with an external airflow loop, and the air outlet end of the air inlet channel is communicated with the air pressure cavity after sequentially penetrating through the casing, the bearing seat, the gap between the third sealing component and the second sealing component.
Furthermore, the third sealing member comprises a sealing ring fixedly sleeved on the outer circle of the wheel disc shaft and an outer sealing ring sleeved outside the second sealing member; the first end of the outer sealing ring is fixed with the casing, the second end of the outer sealing ring faces the sealing ring, and a part of air inlet channels are formed by the outer sealing ring, the bearing seat and the gap between the inner sealing ring; the first end of the sealing ring props against the sealing bush for limiting, and the sealing ring is axially inserted into the outer sealing ring from the second end of the outer sealing ring.
Furthermore, the outer sealing ring is in a hollow cylinder shape, and a concave and annular mounting ring cavity is arranged at the second end of the outer sealing ring; the sealing ring comprises a hollow annular sealing ring body and a labyrinth ring sleeved outside the sealing ring body and connected with the sealing ring body, and the inner ring surface and the outer ring surface of the labyrinth ring are both labyrinth profiles for sealing; the sealing ring body is fixedly sleeved on the excircle of the wheel disc shaft, and the end part of the sealing ring body abuts against the sealing bush for limiting; the side of the opening of the mounting ring cavity of the grate tooth ring is inserted into the mounting ring cavity along the axial direction, the inner ring surface of the grate tooth ring is tightly abutted against the inner circumferential surface of the mounting ring cavity, and the outer ring surface of the grate tooth ring is tightly abutted against the outer circumferential surface of the mounting ring cavity.
The invention has the following beneficial effects:
according to the sealing structure of the compressor bearing, 3 sealing structures consisting of the first sealing member, the second sealing member and the third sealing member are formed, so that the mounting space of the compressor bearing end is effectively utilized, the mounting adaptability of the sealing structure is improved, the sealing effect of lubricating oil at the compressor bearing end of an engine can be effectively ensured, and the working reliability of the engine is further ensured; the bearing sealing structure of the compressor is verified on a certain turboprop series engine, and can effectively seal lubricating oil at the bearing end of the compressor, so that the working reliability of the engine is ensured.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic cross-sectional front view of a compressor bearing sealing structure according to a preferred embodiment of the present invention.
Description of the figures
10. A reel shaft; 20. a bearing seat; 30. a bearing; 40. a first sealing member; 50. a second sealing member; 51. sealing the bushing; 52. an inner sealing ring; 60. a third sealing member; 61. a sealing ring; 62. an outer sealing ring; 70. a pneumatic chamber; 80. a case; 90. an elastic mounting cylinder group; 91. an elastic inner cylinder; 92. an elastic outer cylinder; 110. an intake passage.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
Referring to fig. 1, a preferred embodiment of the present invention provides a compressor bearing sealing structure, including: the wheel disc sealing device comprises a wheel disc shaft 10, a bearing seat 20 sleeved on the wheel disc shaft 10, a bearing 30 fixedly arranged on the excircle of the wheel disc shaft 10 and located in the bearing seat 20, a first sealing member 40, a second sealing member 50 and a third sealing member 60, wherein the first sealing member 40, the second sealing member 50 and the third sealing member 60 are uniformly distributed on the lubricating oil leakage side of the bearing 30. The first seal member 40 is secured within the second seal member 50 and abuts the leakage end of the bearing 30 for preventing a portion of the leakage oil from the bearing 30 from flowing to the compressor airflow path. A gap between the oil outlet side of the second sealing member 50 and the third sealing member 60 forms an air pressure cavity 70 communicated with external air flow, so that pressure difference is formed between two sides of the second sealing member 50, and the second sealing member 50 forms a second seal for sealing lubricating oil discharged from the first sealing member 40. The third sealing member 60 is used to maintain the pressure difference of the pneumatic chamber 70 and form a third seal for sealing the oil discharged from the second sealing member 50.
The action principle of the compressor bearing sealing structure is as follows: a first sealing component 40, a second sealing component 50 and a third sealing component 60 are arranged on the leakage side of the bearing 30, so that three-stage sealing for sequentially sealing leaked lubricating oil is formed; the first sealing component 40 is arranged against the leakage end of the bearing 30 and used for preventing part of lubricating oil leaked from the bearing 30 from flowing towards the direction of an air flow channel of the compressor, and a 1 st sealing structure for sealing the lubricating oil is formed; meanwhile, the external air flow from the fifth stage of the compressor is led to the air pressure cavity 70, so that a certain pressure difference is kept between the front and the rear of the second sealing component 50, a 2 nd sealing structure for sealing the lubricating oil discharged by the first sealing component 40 is formed, and the lubricating oil is prevented from flowing to the third sealing component 60; the third sealing member 60 forms a 3 rd sealing structure, and has the main functions of preventing leakage of air flow inside and outside the air pressure cavity 70, keeping the stability of pressure difference between the front end and the rear end of the second sealing member 50, and further keeping the sealing effect of the second sealing member 50, and sealing a very small amount of lubricating oil leaked from the second sealing member 50 to prevent the lubricating oil from leaking into the air flow channel of the air compressor.
The sealing structure of the compressor bearing of the invention forms the 3 sealing structures, not only effectively utilizes the installation space of the compressor bearing end, improves the installation adaptability of the sealing structure, but also can effectively ensure the sealing effect of lubricating oil at the compressor bearing end of the engine, thereby ensuring the working reliability of the engine; the bearing sealing structure of the compressor is verified on a certain turboprop series engine, and can effectively seal lubricating oil at the bearing end of the compressor, so that the working reliability of the engine is ensured.
Alternatively, as shown in fig. 1, the bearing seat 20 is cylindrical, and has a first end fixed to the casing 80 and an opposite second end recessed to form a bearing cavity for mounting the bearing 30. In this alternative, the bearing seat 20 is fixed to the casing 80 by a plurality of countersunk screws and a plurality of studs; the bearing cavity is used for mounting the fixed bearing 30. The first end of bearing 30 supports and leans on the chamber bottom spacing of bearing chamber, and the excircle of bearing 30 is equipped with elastic mounting section of thick bamboo group 90, and bearing 30 clamps in the bearing chamber through elastic mounting section of thick bamboo group 90. In this alternative, the compressor bearings 30 are roller bearings that are designed to take up radial loads and allow axial movement relative to the casing due to thermal expansion and axial forces.
In this alternative, as shown in fig. 1, the elastic mounting cylinder group 90 includes an elastic inner cylinder 91 and an elastic outer cylinder 92 for absorbing vibration energy and reducing the rotor support rigidity. The elastic inner cylinder 91 is fitted over the outer circumference of the bearing 30 and is connected to the bearing housing 20 for angular positioning. The elastic outer cylinder 92 is sleeved on the outer circle of the elastic inner cylinder 91 and clamped in the bearing cavity, the elastic outer cylinder 92 and the elastic inner cylinder 91 are connected into a whole, the bearing 30 is clamped in the bearing cavity of the bearing seat 20 through the elastic mounting cylinder group 90, vibration energy during working can be effectively absorbed, the lubricating oil sealing effect is improved, the rotor supporting rigidity is effectively reduced, the critical rotating speed of the rotor is further reduced, and the rotor works reliably.
In the embodiment of this alternative, the elastic inner cylinder 91 is hollow cylinder, and a first end of the elastic inner cylinder 91 close to the bottom of the bearing cavity is provided with a first end tooth protruding outwards, the first end tooth is inserted into the bearing seat 20 along the axial direction, and an outer circle of a second end of the elastic inner cylinder 91 is provided with a connecting flange protruding outwards. The elastic inner cylinder 91 is used for protecting the elastic outer cylinder 92 and avoiding the abrasion of the elastic outer cylinder 92 caused by the rotation of the bearing outer ring; the first end teeth of the first end of the elastic inner cylinder 91 are axially inserted into the corresponding grooves on the bearing block 20, so that the elastic mounting cylinder group 90 is connected with the bearing block 20, and the angular position of the elastic inner cylinder 91 is fixed.
In the alternative embodiment, the elastic outer cylinder 92 is a hollow cylinder, the inner peripheral surface and the outer peripheral surface of the elastic outer cylinder are respectively provided with convex bosses arranged in a staggered manner, the second end of the elastic outer cylinder 92 close to the connecting flange is provided with convex second end teeth, and the second end teeth are inserted into the connecting flange along the axial direction. The inner circumferential surface of the elastic outer cylinder 92 is provided with bosses which are uniformly distributed at intervals along the circumferential direction, the outer circumferential surface of the elastic outer cylinder 92 is also provided with bosses which are uniformly distributed at intervals along the circumferential direction, the bosses on the inner circumferential surface and the bosses on the outer circumferential surface are distributed in a staggered manner, and the bosses are used for reducing the supporting rigidity of the rotor and reducing the critical rotating speed of the rotor; on the other hand, the elastic inner cylinder 91 and the elastic outer cylinder 92 can absorb a part of vibration energy, thereby playing a role in reducing vibration; the second end teeth of the second end of the elastic outer cylinder 92 are axially inserted into the connecting flange to realize the connection of the elastic outer cylinder 92 and the elastic inner cylinder 91.
Alternatively, as shown in FIG. 1, the first sealing member 40 includes an annular oil retainer fixed within the second sealing member 50 and abutting against the leakage end of the bearing 30. The first end of the oil baffle ring close to the bearing 30 is recessed to form an annular oil baffle cavity for blocking part of lubricating oil discharged from the bearing 30. When the sealing structure works, lubricating oil flowing out of the bearing 30 is prevented from flowing into the direction of an air flow channel of the air compressor by the action of an oil blocking cavity on the oil blocking spacer ring, and a 1 st sealing structure is formed.
Alternatively, as shown in fig. 1, the second sealing member 50 includes a sealing bush 51 fixedly fitted to the outer circumference of the disk shaft 10, and an inner sealing ring 52 fitted over the sealing bush 51. The oil inlet side of the sealing bush 51 abuts against the bearing 30 for limiting. The oil inlet side of the inner sealing ring 52 is respectively abutted against the second ends of the bearing 30 and the bearing seat 20 for limitation and is fixed with the bearing seat 20, and the inner sealing ring 52 is in clearance fit with the sealing bush 51 to form a second seal for sealing lubricating oil discharged from the first sealing member 40.
In this alternative, as shown in fig. 1, the sealing bush 51 has a hollow cylindrical shape, and the outer circumferential surface thereof is a labyrinth surface for sealing. In the embodiment of the alternative, the sealing bush 51 is fixedly sleeved on the wheel disc shaft 10 and rotates at a high speed along with the wheel disc; the lubricating oil discharged from the oil baffle ring passes through the gap between the inner sealing ring 52 and the sealing bush 51 and the pressure difference between the front and the rear of the second sealing member 50 to form a 2 nd sealing structure. The inner sealing ring 52 is in a hollow cylinder shape, and the inner circumferential surface of the inner sealing ring and the labyrinth surface of the sealing bush 51 form a sealing structure for sealing lubricating oil discharged from the oil blocking and isolating ring. In this alternative embodiment, the inner sealing ring 52 is secured to the bearing seat 20 by a plurality of studs; the graphite layer is coated on the inner hole wall surface of the inner sealing ring 52, so that the inner sealing ring is wear-resistant, the gap between the inner sealing ring 52 and the sealing bush 51 is effectively reduced, and the sealing effect of the inner sealing ring is improved. The oil blocking space ring is arranged in a gap between the oil inlet sides of the sealing bush 51 and the inner sealing ring 52, and the outer peripheral surface of the oil blocking space ring is fixed on the inner peripheral wall of the inner sealing ring 52 in a punching and riveting mode.
Optionally, as shown in fig. 1, an air inlet passage 110 for introducing an external air flow into the air pressure chamber 70 is further provided in the compressor bearing sealing structure. The air inlet end of the air inlet channel 110 is communicated with an external airflow loop, and the air outlet end of the air inlet channel 110 is sequentially arranged through the gap among the casing 80, the bearing seat 20, the third sealing member 60 and the second sealing member 50 and then communicated to the air pressure cavity 70.
Alternatively, as shown in fig. 1, the third sealing member 60 includes a sealing ring 61 fixedly sleeved on the outer circle of the disk shaft 10, and an outer sealing ring 62 sleeved on the outer circle of the second sealing member 50. A first end of the outer sealing ring 62 is fixed with the casing 80, a second end of the outer sealing ring 62 faces the sealing ring 61, and a gap between the outer sealing ring 62 and the bearing seat 20 and the inner sealing ring 52 forms part of the air inlet passage 110. The first end of the sealing ring 61 abuts against the sealing bush 51 for limiting, and the sealing ring 61 is axially inserted into the outer sealing ring 62 from the second end of the outer sealing ring 62.
In this alternative, as shown in fig. 1, the outer sealing ring 62 is hollow and cylindrical, and a second end thereof is provided with an annular mounting ring cavity which is concave. In this alternative embodiment, the outer sealing ring 62 is secured to the case 80 by a plurality of studs along with the bearing housing 20; the graphite layer is coated on the inner hole wall surface of the outer sealing ring 62, so that the outer sealing ring is wear-resistant, and the gap between the outer sealing ring 62 and the inner sealing ring 52 is effectively reduced.
In this alternative, as shown in fig. 1, the sealing ring 61 includes a hollow annular sealing ring body and a labyrinth ring sleeved outside the sealing ring body and connected to the sealing ring body, and both an inner annular surface and an outer annular surface of the labyrinth ring are labyrinth surfaces for sealing. The sealing ring body is fixedly sleeved on the excircle of the wheel disc shaft 10, and the end part of the sealing ring body abuts against the sealing bush 51 for limiting. The side of the opening of the mounting ring cavity of the grate tooth ring is inserted into the mounting ring cavity along the axial direction, the inner ring surface of the grate tooth ring is tightly abutted against the inner circumferential surface of the mounting ring cavity, and the outer ring surface of the grate tooth ring is tightly abutted against the outer circumferential surface of the mounting ring cavity.
In the specific embodiment of this alternative, the second end of the sealing ring 61 is supported against the journal of the wheel disc, the second end of the sealing ring 61 is supported against the sealing bush 51, the whole grate tooth profile of the sealing ring 61 is installed in the mounting ring cavity of the outer sealing ring 61, and the joint of the second end of the second sealing member 50 and the sealing ring body and the grate tooth ring forms the pneumatic cavity 70, when the inner ring surface of the grate tooth ring is in sealing abutment with the inner circumferential surface of the mounting ring cavity, and the outer ring surface of the grate tooth ring is in sealing abutment with the outer circumferential surface of the mounting ring cavity, the external air flow in the pneumatic cavity 70 can be effectively sealed, and the lubricating oil flowing out from the gap between the inner sealing ring 52 and the sealing bush 51 is not leaked into the air compressor air flow channel under the action of the pneumatic cavity 70, so that the sealing ring 61 and the outer sealing ring 62 cooperate to form the 3 rd sealing structure.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A compressor bearing sealing structure, characterized by includes:
the lubricating oil sealing device comprises a wheel disc shaft (10), a bearing seat (20) sleeved on the wheel disc shaft (10), a bearing (30) fixedly arranged on the excircle of the wheel disc shaft (10) and positioned in the bearing seat (20), a first sealing member (40), a second sealing member (50) and a third sealing member (60), wherein the first sealing member (40), the second sealing member (50) and the third sealing member (60) are uniformly distributed on a lubricating oil leakage side of the bearing (30);
the first sealing component (40) is fixed in the second sealing component (50) and abuts against the leakage end of the bearing (30) so as to prevent part of lubricating oil leaked from the bearing (30) from flowing to a compressor airflow channel;
a gap between the oil outlet side of the second sealing component (50) and the third sealing component (60) forms an air pressure cavity (70) communicated with external air flow, so that pressure difference is formed on two sides of the second sealing component (50), and the second sealing component (50) forms a second seal for sealing lubricating oil discharged from the first sealing component (40);
the third sealing component (60) is used for maintaining the pressure difference of the air pressure cavity (70) and forming a third seal for sealing the lubricating oil discharged by the second sealing component (50).
2. The compressor bearing seal structure of claim 1,
the bearing seat (20) is cylindrical, a first end of the bearing seat is fixed with the casing (80), and a second end opposite to the first end is recessed inwards to form a bearing cavity for mounting the bearing (30);
the first end of the bearing (30) is abutted against the cavity bottom of the bearing cavity for limiting, an elastic mounting cylinder group (90) is arranged on the excircle of the bearing (30), and the bearing (30) is clamped in the bearing cavity through the elastic mounting cylinder group (90).
3. The compressor bearing seal structure of claim 2,
the elastic mounting cylinder group (90) comprises an elastic inner cylinder (91) and an elastic outer cylinder (92) which are used for absorbing vibration energy and reducing the supporting rigidity of the rotor;
the elastic inner cylinder (91) is sleeved on the excircle of the bearing (30) and is connected with the bearing seat (20) for angular positioning;
the elastic outer cylinder (92) is sleeved on the excircle of the elastic inner cylinder (91) and clamped in the bearing cavity, and the elastic outer cylinder (92) and the elastic inner cylinder (91) are connected into a whole.
4. The compressor bearing seal structure of claim 3,
the elastic inner cylinder (91) is in a hollow cylinder shape, a first end of the elastic inner cylinder, which is close to the cavity bottom of the bearing cavity, is provided with a first end tooth which protrudes outwards, the first end tooth is inserted into the bearing seat (20) along the axial direction, and an outer circle of a second end of the elastic inner cylinder (91) is provided with a connecting flange which protrudes outwards;
the elastic outer cylinder (92) is in a hollow cylinder shape, bosses which protrude outwards and are arranged in a staggered mode are arranged on the inner circumferential surface and the outer circumferential surface of the elastic outer cylinder respectively, second end teeth which protrude outwards are arranged at the second end, close to the connecting flange, of the elastic outer cylinder (92), and the second end teeth are inserted into the connecting flange along the axial direction.
5. The compressor bearing seal structure of claim 2,
the first sealing component (40) comprises an annular oil blocking ring which is fixed in the second sealing component (50) and abuts against the leakage end of the bearing (30);
the first end of the oil blocking ring close to the bearing (30) is recessed to form an annular oil blocking cavity for blocking part of lubricating oil leaked from the bearing (30).
6. The compressor bearing seal structure of claim 5,
the second sealing component (50) comprises a sealing bush (51) fixedly sleeved on the excircle of the wheel disc shaft (10) and an inner sealing ring (52) sleeved on the sealing bush (51);
the oil inlet side of the sealing bush (51) abuts against the bearing (30) for limiting;
the oil inlet side of the inner sealing ring (52) is respectively abutted against the bearing (30) and the second end of the bearing seat (20) for limiting, and is fixed with the bearing seat (20), the inner sealing ring (52) is in clearance fit with the sealing bush (51), and a second sealing for sealing lubricating oil discharged from the first sealing member (40) is formed.
7. The compressor bearing seal structure of claim 6,
the sealing bush (51) is in a hollow cylinder shape, and the peripheral surface of the sealing bush is a labyrinth profile for sealing;
the inner sealing ring (52) is in a hollow cylinder shape, and the inner circumferential surface of the inner sealing ring and the labyrinth profile of the sealing bush (51) form a sealing structure for sealing lubricating oil discharged from the oil blocking and isolating ring;
the oil blocking spacer ring is arranged in a gap between the oil inlet sides of the sealing bush (51) and the inner sealing ring (52), and the outer peripheral surface of the oil blocking spacer ring is fixed on the inner peripheral wall of the inner sealing ring (52) in a punching and riveting mode.
8. The compressor bearing seal structure of claim 6,
an air inlet channel (110) for introducing external air flow into the air pressure cavity (70) is further arranged in the compressor bearing sealing structure;
the air inlet end of the air inlet channel (110) is communicated with an external airflow loop, and the air outlet end of the air inlet channel (110) is communicated to the air pressure cavity (70) after sequentially penetrating through a gap among the casing (80), the bearing seat (20), the third sealing member (60) and the second sealing member (50).
9. The compressor bearing seal structure of claim 8,
the third sealing component (60) comprises a sealing ring (61) fixedly sleeved on the excircle of the wheel disc shaft (10) and an outer sealing ring (62) sleeved outside the second sealing component (50);
a first end of the outer sealing ring (62) is fixed with the casing (80), a second end of the outer sealing ring (62) faces the sealing ring (61), and a gap between the outer sealing ring (62) and the bearing seat (20) and the inner sealing ring (52) forms part of the air inlet channel (110);
the first end of the sealing ring (61) abuts against the sealing bush (51) for limiting, and the sealing ring (61) is axially inserted into the outer sealing ring (62) from the second end of the outer sealing ring (62).
10. The compressor bearing seal structure of claim 9,
the outer sealing ring (62) is in a hollow cylinder shape, and a concave and annular mounting ring cavity is arranged at the second end of the outer sealing ring;
the sealing ring (61) comprises a hollow annular sealing ring body and a labyrinth ring sleeved outside the sealing ring body and connected with the sealing ring body, and both the inner ring surface and the outer ring surface of the labyrinth ring are labyrinth profiles for sealing;
the sealing ring body is fixedly sleeved on the excircle of the wheel disc shaft (10), and the end part of the sealing ring body abuts against the sealing bush (51) for limiting;
the grate tooth ring is inserted into the mounting ring cavity from the opening side of the mounting ring cavity along the axial direction, the inner ring surface of the grate tooth ring is in sealing abutting joint with the inner circumferential surface of the mounting ring cavity, and the outer ring surface of the grate tooth ring is in sealing abutting joint with the outer circumferential surface of the mounting ring cavity.
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| CN119062409A (en) * | 2024-08-14 | 2024-12-03 | 中国航发湖南动力机械研究所 | Shaft end sealing structure and aircraft engine |
| CN119062409B (en) * | 2024-08-14 | 2025-11-07 | 中国航发湖南动力机械研究所 | Shaft end sealing structure and aeroengine |
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| CN113309616B (en) | 2022-09-16 |
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