CN220692924U

CN220692924U - Bearing device and motor

Info

Publication number: CN220692924U
Application number: CN202322432767.9U
Authority: CN
Inventors: 马俊; 王祥; 李云鹏; 张毅; 张文强; 张涛; 丁长平
Original assignee: Zhejiang Shunyun Internet Technology Co ltd; Wolong Electric Nanyang Explosion Proof Digital Service Co ltd
Current assignee: Zhejiang Shunyun Internet Technology Co ltd; Wolong Electric Nanyang Explosion Proof Digital Service Co ltd
Priority date: 2023-09-06
Filing date: 2023-09-06
Publication date: 2024-03-29
Anticipated expiration: 2033-09-06

Abstract

The utility model discloses a bearing device and a motor, the bearing device comprises a bearing assembly and an inner cover assembly, the inner cover assembly is arranged on the inner side of the bearing assembly, the inner cover assembly comprises an inner cover body, and a floating sealing element, a comb tooth sealing element and an air sealing element which are arranged on the inner cover body and can be in sealing connection with the circumference of a rotating shaft, and the floating sealing element, the comb tooth sealing element and the air sealing element are sequentially arranged from one side close to the bearing assembly to the other side. According to the bearing device provided by the utility model, the air sealing element plays a role in primary decompression sealing, the comb tooth sealing element plays a role in secondary decompression sealing, the floating sealing element plays a role in tertiary oil gas sealing, and the influence of negative pressure in the motor can be effectively reduced through the arrangement of the tertiary sealing structure, so that the risk that oil gas generated in the bearing assembly enters the motor is effectively reduced, and the oil leakage phenomenon of the motor is reduced.

Description

Bearing device and motor

Technical Field

The utility model relates to the field of motor equipment, in particular to a bearing device and a motor.

Background

The high-rotation-speed symmetrical wind path sliding bearing device motor usually adopts forced lubrication to meet the requirements of self heat dissipation of the motor and safe and stable operation of equipment. When the motor operates, lubricating oil with certain pressure enters the bearing through the oil inlet pipe, the oil is atomized and heated under the impact of the high-speed rotating shaft, and micro-positive pressure is formed in oil mist in the bearing box; in the motor inner air path, air flows rapidly and circularly under the action of a rotor inner fan, and inner covers of bearings at two ends are positioned near a negative pressure area of an air inlet of the fan. Under the combined action of positive pressure in the bearing box and negative pressure at the inner cover of the bearing, oil mist in the bearing box flows from a high-pressure area (the bearing box) to a low-pressure area (the inner cavity of the motor), the oil mist flows along with circulating air flow in the inner cavity of the motor and adheres to the inner wall of the motor and the surface of the coil, oil drops are accumulated and formed, and the oil drops are accumulated at the bottom of the motor and the like, so that the bearing device leaks oil into the motor.

In the prior art, a floating sealing structure is generally arranged on an inner cover of a motor bearing to block oil gas in a bearing box, however, in the mode in the prior art, the sealing effect of the floating sealing structure is poor, and the phenomenon of oil leakage of the motor caused by processing or assembly problems often occurs, so that the sealing effect is unstable.

Therefore, how to improve the oil leakage prevention effect of the bearing device is a technical problem that needs to be solved by those skilled in the art.

Disclosure of Invention

The utility model aims to provide a bearing device and a motor, which can effectively prevent oil gas in a bearing box from entering the interior of the motor and reduce the risk of oil leakage.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the bearing device comprises a bearing assembly and an inner cover assembly, wherein the inner cover assembly is arranged on the inner side of the bearing assembly, the inner cover assembly comprises an inner cover body, and a floating sealing element, a comb tooth sealing element and an air sealing element which are arranged on the inner cover body and can be in circumferential sealing connection with a rotating shaft, and the floating sealing element, the comb tooth sealing element and the air sealing element are sequentially arranged from one side close to the bearing assembly to the other side.

Preferably, the airtight member is detachably mounted on a side of the inner cap body facing away from the bearing assembly.

Preferably, the airtight seal is a plastic seal.

Preferably, a mounting hole is formed in one side, away from the bearing assembly, of the inner cover body, a through hole is formed in the air sealing element, and the mounting hole of the inner cover body is connected with the through hole of the air sealing element through a fastener.

Preferably, the comb teeth sealing member is a copper sealing member, and the comb teeth sealing member comprises a plurality of comb teeth rings, and each comb teeth ring is arranged at intervals along the axial direction of the inner cover body.

Preferably, the number of the comb gear rings is 4-6.

Preferably, the balance air duct is further included, an inner cover cavity is arranged in the inner cover body, the inner cover cavity is positioned between the floating sealing piece and the comb tooth sealing piece, and the inner cover cavity is communicated with the balance air duct; the balance air duct is externally connected with air or high-pressure gas.

Preferably, the cross section of inner cup body is U type structure, the opening of inner cup body is inboard towards, floating seal installs the inner cup body is close to the one side inner periphery of bearing assembly, broach sealing element installs the inner cup body deviates from the one side inner periphery of bearing assembly, airtight spare is installed the inner cup body deviates from the one side of bearing assembly.

Preferably, the bearing assembly comprises a bearing housing and a bearing shell, the bearing shell being mounted on the bearing housing; a bearing chamber for bearing lubricating oil is arranged between the bearing seat and the bearing bush; and a ventilation screw pipe is connected to the bearing seat at a position close to the bearing chamber, one end of the ventilation screw pipe is communicated with the bearing chamber, and the other end of the ventilation screw pipe is communicated with air.

The utility model also provides a motor, which comprises the bearing device.

The bearing device provided by the utility model comprises a bearing assembly and an inner cover assembly, wherein the inner cover assembly is arranged on the inner side of the bearing assembly, the inner cover assembly comprises an inner cover body, and a floating sealing element, a comb tooth sealing element and an air sealing element which are arranged on the inner cover body and can be in sealing connection with the circumferential direction of a rotating shaft, and the floating sealing element, the comb tooth sealing element and the air sealing element are sequentially arranged from one side close to the bearing assembly to the other side. According to the bearing device provided by the utility model, the floating sealing element, the comb tooth sealing element and the air sealing element are sequentially arranged on the inner cover body by taking the inner cover body as a main supporting structure, the air sealing element has a primary decompression sealing function, the comb tooth sealing element has a secondary decompression sealing function, the floating sealing element has a tertiary oil gas sealing function, and the influence of negative pressure in the motor can be effectively reduced by virtue of the tertiary sealing structure, so that the risk that oil gas generated in the bearing assembly enters the motor is effectively reduced, and the oil leakage phenomenon of the motor is reduced.

In a preferred embodiment, the balance air duct is further provided with an inner cover cavity in the inner cover body, the inner cover cavity is positioned between the floating sealing piece and the comb tooth sealing piece, and the inner cover cavity is communicated with the balance air duct; the balance air duct is externally connected with air or high-pressure gas. Above-mentioned setting, through balanced air duct comes for the inner cup cavity of inner cup body provides air or high-pressure gas, thereby increases the gas pressure in the inner cup cavity, make the gas pressure in the inner cup cavity is not less than atmospheric pressure, has further reduced the pressure differential between the high pressure in the bearing assembly with the inside low pressure of motor, the inner cup cavity plays the transitional effect, further reduces oil gas entering the inside risk of motor.

The motor provided by the utility model is provided with the bearing device, and the bearing device has the technical effects, so that the motor provided with the bearing device also has the corresponding technical effects.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an assembly structure of a bearing device according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a partial cross-sectional structure of an inner cap assembly of the bearing assembly of FIG. 1;

FIG. 3 is a schematic cross-sectional view of an inner cap body of the inner cap assembly of the bearing assembly of FIG. 1;

FIG. 4 is a schematic view of the airtight component of the inner cap assembly of FIG. 2;

FIG. 5 is a schematic view of the structure of the oil seal assembly of the inner cap assembly of FIG. 2;

wherein: a bearing assembly 100; a bearing block 101; bearing shell 102; a bearing chamber 103; an inner cap assembly 200; an inner cap body 201; mounting holes 201-1; a floating seal 202; seal groove 202-1; comb seal 203; an airtight member 204; an inner cap cavity 205; balance airway 300; a vent coil 400; a rotation shaft 500.

Detailed Description

The utility model aims at providing a bearing device and a motor, which can achieve the aim of preventing oil mist from leaking into the motor.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 5, fig. 1 is a schematic view illustrating an assembling structure of a bearing device according to an embodiment of the present utility model; FIG. 2 is a schematic view of a partial cross-sectional structure of an inner cap assembly of the bearing assembly of FIG. 1; FIG. 3 is a schematic cross-sectional view of an inner cap body of the inner cap assembly of the bearing assembly of FIG. 1; FIG. 4 is a schematic view of the airtight component of the inner cap assembly of FIG. 2; fig. 5 is a schematic view of the structure of the oil seal member in the inner cap assembly shown in fig. 2.

In this embodiment, as shown in fig. 1, the bearing device includes a bearing assembly 100 and an inner cap assembly 200, the inner cap assembly 200 is mounted at the inner side of the bearing assembly 100, the inner cap assembly 200 includes an inner cap body 201, and a floating seal 202, a comb seal 203, and a gas seal 204 provided on the inner cap body 201 and sealingly connectable to the circumference of the rotation shaft 500, the floating seal 202, the comb seal 203, and the gas seal 204 being sequentially arranged from one side near the bearing assembly 100 to the other side.

Specifically, the bearing assembly 100 is installed at the outside of the rotation shaft 500, the inner cap assembly 200 is installed at the inside of the rotation shaft 500, and after the bearing device is connected with the driving part, the entire motor is constructed, a part of the bearing assembly 100 is located at the outside of the housing of the motor, a part is located at the inside of the housing, and the inner cap assembly 200 is located at the inside of the housing of the motor. The bearing device is preferably slidably connected to the shaft 500, i.e. the bearing device is preferably a sliding bearing device. The inner cap assembly 200 includes an inner cap body 201, a floating seal 202, a comb seal 203 and a gas seal 204, wherein the inner cap body 201, the floating seal 202, the comb seal 203 and the gas seal 204 are all of annular structures, and the floating seal 202, the comb seal 203 and the gas seal 204 are all installed on the inner periphery of the inner cap body 201, and the floating seal 202, the comb seal 203 and the gas seal 204 are all surrounded on the outer part of the rotating shaft 500 and are used for forming a sealing structure with the rotating shaft 500, so that oil gas from the bearing assembly 100 is prevented from entering the inside of the housing of the motor, and oil leakage phenomenon is caused; further, for easy installation, the floating seal 202, the comb seal 203 and the air seal 204 are preferably split structures, preferably two semi-circular structures are spliced.

According to the bearing device provided by the utility model, the inner cover body 201 is used as a main supporting structure, the floating seal piece 202, the comb tooth seal piece 203 and the air seal piece 204 are sequentially arranged on the inner cover body 201, the air seal piece 204 has a primary decompression sealing function, the comb tooth seal piece 203 has a secondary decompression sealing function, the floating seal piece 202 has a tertiary oil gas sealing function, and through the arrangement of the tertiary sealing structure, the influence of negative pressure in the motor can be effectively reduced, so that the risk that oil gas generated in the bearing assembly 100 enters the motor is effectively reduced, and the oil leakage phenomenon of the motor is reduced.

In some embodiments, as shown in fig. 2 and 4, the airtight member 204 is detachably mounted to the side of the inner cover body 201 facing away from the bearing assembly 100. Specifically, the airtight member 204 is located at the innermost side of the inner lid body 201, and functions as a primary decompression seal, mainly blocking the influence of negative pressure gas. The gap between the airtight member 204 and the rotation shaft 500 is minimized and the sealing effect is excellent. Preferably, the airtight member 204 is a plastic sealing member, and the sealing effect is good. Further, the airtight member 204 is generally made of polytetrafluoroethylene, which has the characteristics of non-adhesive surface, good lubrication and resistance to atmospheric aging. When the airtight piece 204 works, the optimal clearance effect is achieved through the natural grinding of the rotating shaft 500 and the airtight piece 204; in general, after the air seal 204 is naturally ground, the gap between the air seal 204 and the rotating shaft 500 can be less than 0.1mm, so as to achieve the effect of dynamic and static sealing and reduce the influence of negative pressure gas in the motor casing.

In some embodiments, the inner cap body 201 is provided with a mounting hole 201-1 on a side facing away from the bearing assembly 100, and the airtight member 204 is provided with a through hole, and the mounting hole 201-1 of the inner cap body 201 is connected with the through hole of the airtight member 204 by a fastener. Specifically, by providing the mounting hole 201-1 in the inner cap body 201 and providing the through hole in the airtight member 204, the existing inner cap structure can be improved, and the mounting hole 201-1 is directly provided in the existing inner cap structure, so that the airtight member 204 is assembled, thereby saving the cost. Of course, the connection between the inner lid body 201 and the airtight member 204 may be other manners, such as clipping, caulking, etc. The fastener is preferably a bolt, and the bolt is convenient to attach, detach and replace the airtight member 204.

In some embodiments, as shown in fig. 2 and 3, the comb seal 203 is a copper seal, and the comb seal 203 includes a plurality of comb teeth rings, each of which is spaced apart along the axial direction of the inner cap body 201. Further, the number of the comb gear rings is 4-6. Specifically, the number of comb teeth rings is preferably 5; the structure of the comb teeth sealing piece 203 is adopted, so that the sealing effect is further enhanced, and the negative pressure air in the motor shell is decompressed step by step when passing through each comb tooth ring; when the comb gear ring is in sealing work, the installation clearance between the comb gear ring and the rotating shaft 500 is generally 0.1-0.15mm, the dynamic and static sealing clearance can reach 0.15-0.2mm after the rotating shaft 500 and the comb gear ring are naturally ground in the running process, the influence of negative pressure gas is reduced again, and the seal is mainly used for blocking the influence of the negative pressure gas. Of course, the number of comb teeth rings may be selected according to the need, and is not limited to the manner given in the present embodiment, and may be, for example, 3 to 7.

In some embodiments, the balance air duct 300 is further included, an inner cover cavity 205 is provided in the inner cover body 201, the inner cover cavity 205 is located between the floating seal 202 and the comb seal 203, and the inner cover cavity 205 is in communication with the balance air duct 300; balance airway 300 is externally connected with air or externally connected with high pressure gas. By the arrangement, air or inert high-pressure gas is provided for the inner cover cavity 205 of the inner cover body 201 through the balance air duct 300, so that the gas pressure in the inner cover cavity 205 is increased, the gas pressure in the inner cover cavity 205 is more than or equal to the atmospheric pressure, the pressure difference between the high pressure in the bearing assembly 100 and the low pressure in the motor is further reduced, the inner cover cavity 205 plays a transitional role, and the risk that oil gas enters the motor is further reduced.

In some embodiments, the cross section of the inner cap body 201 is in a U-shaped structure, the opening of the inner cap body 201 faces inward, the floating seal 202 is mounted on the inner periphery of the inner cap body 201 on the side close to the bearing assembly 100, the comb seal 203 is mounted on the inner periphery of the inner cap body 201 on the side away from the bearing assembly 100, and the airtight seal 204 is mounted on the side of the inner cap body 201 on the side away from the bearing assembly 100. Specifically, as shown in fig. 2, by the arrangement of the inner cap body 201 with a U-shaped structure, the floating seal member 202 and the comb seal member 203 can be respectively arranged at two sides of the inner cap body 201, so as to perform dual protection, and meanwhile, a hollow portion is formed in the middle of the U-shaped structure of the inner cap body 201, and an inner cap cavity 205 is formed between the hollow portion and the rotating shaft 500.

Further, as shown in fig. 5, the floating seal 202 has the characteristics of small density, good compactness, oil resistance, aging resistance, wear resistance and the like, and the inner periphery of the floating seal 202 is provided with a plurality of sealing grooves 202-1, so that oil gas from the bearing assembly 100 can enter the sealing grooves 202-1 of the floating seal 202 to play a role in oil gas sealing. Specifically, running clearances of all parts of the floating seal piece 202 can be within 0.10mm, the sealing groove 202-1 of the floating seal piece 202 and the surface of the rotating shaft 500 can reach more than 6 levels of precision, oil mist gas is effectively prevented from entering the inner cover cavity 205 of the inner cover body 201 by the cooperation clearance of the floating seal piece 202 and the action of the sealing groove 202-1, and the sealing at the position mainly blocks the influence of the oil mist gas.

In some embodiments, the bearing assembly 100 includes a bearing housing 101 and a bushing 102, the bushing 102 being mounted on the bearing housing 101, the bushing 102 being in sliding connection with the shaft 500; a bearing chamber 103 for bearing lubricating oil is arranged between the bearing seat 101 and the bearing bush 102; the bearing seat 101 is connected with a ventilation solenoid 400 at a position close to the bearing chamber 103, one end of the ventilation solenoid 400 is communicated with the bearing chamber 103, and the other end is communicated with air. Specifically, through the arrangement of the ventilation solenoid 400, the pressure in the bearing chamber 103 is automatically balanced by using external gas, so that the problem of negative pressure oil leakage of the motor is solved from the source; the vent coil 400 can release the high pressure in the bearing chamber 103 as much as possible at atmospheric pressure, thereby reducing the pressure differential between the bearing chamber 103 and the motor housing. Further, the bearing chambers 103 positioned at both sides of the bearing bush 102 are provided with ventilation coils 400, so that the pressure in both bearing chambers 103 is consistent with the atmospheric pressure; as the oil gas enters the vent coil 400, it condenses along the inner wall of the vent coil 400 and flows back into the bearing chamber 103.

Specifically, the application reduces the influence of gas pressure on the basis of the sealing structure of the inner cover assembly 200 by a two-stage comprehensive compensation mode, as follows:

and I, comprehensive compensation: the balance air duct 300 is adopted, and the balance air duct 300 is positioned between the II-level decompression seal and the III-level decompression seal and externally connected with air or inert high-pressure gas, so that the pressure in the area is more than or equal to the atmospheric pressure;

and II, comprehensive compensation: with vent coil 400, vent coil 400 is located between the class iii decompression seal and bushing 102, and is in communication with bearing chamber 103 and the outside through vent coil 400+ breathing cap, respectively, such that the internal pressure of bearing chamber 103 = atmospheric pressure.

And (3) comprehensive compensation: the addition of the balance air duct 300 communicates the cavity between the bushing 102 and the floating seal 202 with the outside air, and compensates for the air pressure within the bearing assembly 100 so that the air pressure within and outside the bearing chamber 103 remains substantially uniform.

In a specific embodiment, according to the multistage decompression integrated compensation method, firstly, a cavity between a bearing bush 102 and a floating seal piece 202 is communicated with outside air, micro-positive pressure caused by oil atomization and temperature rise in a bearing chamber 103 is eliminated, so that the internal pressure of the bearing box=atmospheric pressure, secondly, a balance air duct 300 is added in an inner cover cavity 205 between the floating seal piece 202 and a comb tooth seal piece 203, and the outside air or inert high-pressure gas is communicated, so that the pressure in the area is more than or equal to the atmospheric pressure, so that the cavity pressure between the bearing bush 102 and the floating seal piece 202 is less than or equal to the internal cover cavity 205 between the floating seal piece 202 and the comb tooth seal piece 203, and the negative pressure is eliminated from the source; finally, the floating sealing element 202 is used for sealing oil, and the comb tooth sealing element 203 and the air sealing element 204 are used for doubly sealing gas, so that oil leakage accidents caused by negative pressure are blocked from the source, the phenomenon of internal leakage of the motor caused by excessive negative pressure in the inner cavity of the motor is effectively prevented, the phenomenon that the positive pressure in the inner cavity of the bearing chamber 103 is excessive and the motor leaks oil to the outside is also prevented, and the safe and stable operation of the motor is ensured.

The bearing device has the following beneficial effects:

1. the floating sealing element 202 is used for sealing oil, the comb tooth sealing element 203 and the air sealing element 204 are used for doubly sealing gas, so that the internal air pressure of the bearing chamber 103 is basically kept consistent, the gas flow is less or no, and the oil leakage accident caused by negative pressure is blocked from the source;

2. the cavity between the bearing bush 102 and the floating seal 202 is communicated with the outside air, so that micro-positive pressure caused by oil atomization and temperature rise in the bearing seat 101 is eliminated, and the internal pressure of the bearing chamber 103 is equal to the atmospheric pressure;

3. the balance air duct 300 is added in the inner cover cavity 205 between the floating seal 202 and the comb seal 203, and the air or inert high-pressure gas is communicated to ensure that the pressure in the area is more than or equal to the atmospheric pressure;

4. the cavity pressure between the bearing bush 102 and the floating seal piece 202 is less than or equal to the cavity pressure 205 of the inner cover between the floating seal piece 202 and the comb tooth seal piece 203, so that atomized oil mist cannot leak into the motor, and the aim of preventing the oil mist from leaking into the motor is fulfilled.

In addition to the above bearing device, the present utility model also provides an electric motor including the above bearing device, and other parts of the structure of the electric motor refer to the prior art, and are not repeated herein.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The bearing device provided by the utility model is described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims

1. The utility model provides a bearing device, its characterized in that includes bearing assembly (100) and inner cup subassembly (200), inner cup subassembly (200) are installed the inboard of bearing assembly (100), inner cup subassembly (200) include inner cup body (201) and set up on inner cup body (201) and can with the circumference sealing connection's of pivot (500 floating seal piece (202), broach sealing piece (203) and gas seal piece (204), floating seal piece (202) broach sealing piece (203) with gas seal piece (204) are arranged in proper order from being close to one side of bearing assembly (100) to the opposite side.

2. Bearing arrangement according to claim 1, characterized in that the gas seal (204) is detachably mounted on the side of the inner cap body (201) facing away from the bearing assembly (100).

3. Bearing arrangement according to claim 2, characterized in that the gas seal (204) is a plastic seal.

4. Bearing arrangement according to claim 2, characterized in that the inner cap body (201) is provided with a mounting hole (201-1) on the side facing away from the bearing assembly (100), the airtight element (204) is provided with a through hole, and the mounting hole (201-1) of the inner cap body (201) is connected with the through hole of the airtight element (204) by means of a fastener.

5. Bearing arrangement according to claim 1, wherein the comb seal (203) is a copper seal, the comb seal (203) comprising a number of comb teeth, each of the comb teeth being arranged at intervals in the axial direction of the inner cap body (201).

6. The bearing device according to claim 5, wherein the number of comb teeth is 4-6.

7. The bearing device according to any one of claims 1 to 6, further comprising a balance air duct (300), wherein an inner cover cavity (205) is provided in the inner cover body (201), the inner cover cavity (205) is located between the floating seal (202) and the comb seal (203), and the inner cover cavity (205) is in communication with the balance air duct (300); the balance air duct (300) is externally connected with air or high-pressure air.

8. Bearing arrangement according to claim 7, characterized in that the cross section of the inner cap body (201) is of a U-shaped structure, the opening of the inner cap body (201) is directed inwards, the floating seal (202) is mounted on the inner periphery of the inner cap body (201) on the side close to the bearing assembly (100), the comb seal (203) is mounted on the inner periphery of the inner cap body (201) on the side facing away from the bearing assembly (100), and the air seal (204) is mounted on the side of the inner cap body (201) facing away from the bearing assembly (100).

9. Bearing arrangement according to claim 7, characterized in that the bearing assembly (100) comprises a bearing housing (101) and a bearing shell (102), the bearing shell (102) being mounted on the bearing housing (101); a bearing chamber (103) for bearing lubricating oil is arranged between the bearing seat (101) and the bearing bush (102); and a ventilation screw pipe (400) is connected to the bearing seat (101) at a position close to the bearing chamber (103), one end of the ventilation screw pipe (400) is communicated with the bearing chamber (103), and the other end of the ventilation screw pipe is communicated with air.

10. An electric machine comprising a bearing arrangement, characterized in that the bearing arrangement is a bearing arrangement according to any one of claims 1 to 9.