Radial air foil bearing mounting structure for airborne electric compressor

Abstract

The invention belongs to the technical field of aviation airborne electric compressors, and relates to a radial air foil bearing mounting structure for an airborne electric compressor. Comprising a motor shell, a damping rubber ring, a bearing sleeve, a steel sleeve, a sealing ring, a metal gasket, an anti-loosening gasket, an elastic clamping ring, a stop pin, an air entraining nozzle, a shaft, a motor stator, a motor rotor, an impeller, an interference pin, a fastening screw and an anti-loosening gasket. A notch in the steel sleeve is of an inverted horn-shaped structure with the small outside and the large inside, it is guaranteed that the lap joint foil can freely move and rotate and adapt to rotor deflection during work, meanwhile, a sealing ring between the steel sleeve and the bearing sleeve can be used for vibration reduction in the airborne environment, misalignment installation errors of front and rear radial bearings and the rotor are reduced, and the requirement for the coaxiality of all assemblies is lowered; the sealing ring is used for sealing the radial air bearing, and the actual gap between the sealing ring and the rotor can be flexibly selected according to the cooling flow and the internal pressure maintaining requirement of the bearing.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation airborne electric compressors and relates to a radial air foil bearing installation structure for airborne electric compressors. Background Art

[0002] The electric compressor is the core component of the electric environmental control system on future civil aircraft. As a high-pressure air source, it can form a new electric environmental control system in conjunction with radiators, pressure regulators and other components. Compared with traditional turbine refrigeration, electric environmental control does not need to draw air from the engine, which reduces engine compensation losses and eliminates complex pneumatic pipelines, which is conducive to reducing the size and weight of the aircraft and improving reliability.

[0003] Airborne electric compressors have strict requirements on size and weight. Traditional rolling bearing-supported compressors are not suitable for the future aviation field due to their complex structure, regular maintenance, short life, low reliability, and air source susceptible to oil pollution. The air bearing-supported electric compressor involved in the present invention adopts dynamic pressure air bearing support, has the advantages of maintenance-free, high limit speed, no pollution, high reliability, etc., is particularly suitable for airborne environments, and is conducive to achieving the purpose of compact and efficient environmental control systems.

[0004] For airborne electric compressors, air bearings are core components. The installation structure of radial air bearings plays a vital role in compressors. The traditional installation structure has many shortcomings:

[0005] 1. The interface for installing the foil is generally a parallel groove. There is no free space at the foil bend of the air bearing, which makes the bearing unable to adapt to the depth and affects the load-bearing performance;

[0006] 2. The bearing sleeve is directly fixed to the motor housing by screws. It is a rigid connection without vibration reduction measures. The airborne vibration is directly transmitted to the air bearing foil, which can easily cause rotor collision and wear under large vibration impact, and the softer elastic foil is directly deformed by the impact.

[0007] 3. The bearing sleeve is usually provided with a stopper at one end along the axial direction, and a sealing baffle is used at the other end to stop the foil. On the one hand, the bearing sleeve is difficult to process, and on the other hand, the screws need to be fuse-fitted after each installation to prevent loosening, which makes disassembly and assembly more troublesome.

[0008] 4. The sealing baffle is generally made of polyimide material and has the function of comb teeth sealing. It relies on it to stop the foil for a long time. The axial high-frequency vibration impact will cause a gap in the sealing baffle, and the momentum of the foil will become larger and larger until the air bearing fails.

[0009] 5. To meet the rigidity requirements, the steel bearing sleeve is directly fixed to the motor housing. The increase in size and weight caused by the large-sized bearing sleeve is contrary to the requirements of compactness and efficiency of the airborne environmental control system.

[0010] 6. During the floating process of the product, there is sliding friction contact between the rotating shaft and the bearing foil. During long-term starting and stopping, the torque is repeatedly transmitted to the bearing sleeve screws, and the screws are at risk of breaking.

[0011] 7. The positioning circle of the bearing sleeve on the housing is quite different from the inner diameter of the bearing sleeve, and the coaxiality between the inner hole of the mounting foil and the housing cannot be strictly guaranteed.

[0012] 8. The air bleed cooling of the radial bearing is at a single angle, which cannot achieve uniform and sufficient cooling in the circumferential direction. In addition, the bearing cooling and motor cooling are isolated, resulting in reduced cooling efficiency and volute outlet flow.

[0013] 9. The bearing is cooled by direct co-directional air cooling. When foreign particles are mixed in the air, it is easy to cause the air bearing to get stuck. Summary of the invention

[0014] Purpose of the Invention

[0015] Provided is an air bearing mounting structure for an airborne electric compressor. The invention has the characteristics of high vibration and impact resistance, strong adaptability, easy disassembly, high reliability, space saving, etc.

[0016] Technical Solution

[0017] An air bearing mounting structure for an airborne electric compressor includes a motor housing, a vibration-damping rubber ring, a bearing sleeve, a steel sleeve, a sealing ring, a metal gasket, a locking gasket, an elastic retaining ring, a stop pin, an air bleed nozzle, a shaft, a motor stator, a motor rotor, an impeller, an interference pin, a fastening screw, and a locking gasket. The steel sleeve is mounted on the side of the bearing sleeve close to the turbine, and a stop pin is used to limit the rotation. Two circumferential grooves are provided on the inner wall of the bearing sleeve for arranging the vibration-damping rubber ring. The sealing area formed by the two vibration-damping rubber rings between the bearing sleeve and the steel sleeve constitutes a cooling channel. The cooling channel provides cooling for the bearing. The cooling channel is connected to the air inlet on the bearing sleeve. An air outlet is provided on the wall of the steel sleeve. The gas is discharged from the air outlet and provides cooling for the bearing. A sealing ring is provided at the end of the steel sleeve close to the turbine, and is mounted on the bearing sleeve through an interference pin. A metal gasket is provided between the steel sleeve and the sealing ring to prevent the sealing ring from being scratched by the bearing.

[0018] Another sealing ring is provided on the side of the bearing sleeve close to the motor, and the sealing ring is fitted on the groove of the bearing sleeve through an elastic collar, and another metal gasket is arranged between the steel sleeve and the sealing ring; ventilation holes are provided in the circumference of the bearing sleeve, and the gas generated by the rotation of the impeller provides cooling gas for the motor through the ventilation holes;

[0019] During assembly, the bearing sleeve is installed on the motor housing through fastening screws and anti-loosening washers, with an anti-loosening washer in the middle, and the shaft is installed in the air bearing in the steel sleeve.

[0020] Furthermore, it also includes an air bleed nozzle, which is arranged at the entrance of the inlet channel of the bearing sleeve.

[0021] Furthermore, the direction of the head of the air bleed nozzle is opposite to the rotation direction of the impeller, and the impurities in the cooling air flow are filtered through the reverse air bleed nozzle.

[0022] Furthermore, the notch on the steel sleeve for mounting the bearing foil is in the shape of an inverted trumpet, and the notch is provided with a flat foil. By adding a gasket to the notch, the angle of the flat foil can be adjusted, thereby adjusting the preload force of the bearing and the rotor.

[0023] Furthermore, the inner ring of the sealing ring is arranged with comb teeth to achieve dynamic pressure sealing of the bearing and prevent large particles of foreign matter from entering the bearing.

[0024] Furthermore, a groove is processed on one side of the bearing sleeve, the steel sleeve and the metal gasket, and the steel sleeve is prevented from rotating in the circumferential direction by the cooperation of the groove and the stop pin.

[0025] Furthermore, the motor housing and bearing sleeve are made of 7A04.

[0026] Furthermore, the steel sleeve is made of 0Cr17Ni7.

[0027] Furthermore, the sealing ring material is polyimide.

[0028] Furthermore, the gasket material is GH4169

[0029] Furthermore, the elastic collar material is 3J68.

[0030] The beneficial effects of this application are:

[0031] The notch on the steel sleeve is an "inverted trumpet-shaped" structure with "small outside and large inside", which ensures that the overlapping foil can rotate freely during operation to adapt to the rotor deflection. At the same time, the sealing ring between the steel sleeve and the bearing sleeve can be used for vibration reduction in the airborne environment, as well as to reduce the misalignment installation error between the front and rear radial bearings and the rotor, and the coaxiality requirements between the components are reduced; the sealing ring is used to seal the radial air bearing, and the actual gap between the sealing ring and the rotor can be flexibly selected according to the cooling flow rate and the internal pressure maintenance requirements of the bearing; the axial fixation of the steel sleeve is achieved by pins or elastic clamps, and pinholes are provided at the notch of the clamp ring to achieve flexible removal of the foil; the bearing sleeve is made of aluminum, the steel sleeve is made of steel and is small in size, and the rest of the shell material is also aluminum, which can achieve the purpose of reducing the weight of the air compressor and improving the local support stiffness; the head of the bleed nozzle is opposite to the direction of rotation of the impeller, and the bearing cooling adopts reverse bleed, which can effectively reduce the possibility of large particles of foreign matter entering the air bearing, reduce the risk of rotor jamming, and improve the operating reliability and use environment margin of the air compressor. At the same time, the gas generated by the rotation of the impeller can also provide cooling for the motor through the ventilation holes of the bearing sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] FIG2 is a schematic diagram of the structure of the bearing sleeve of the present invention and its installation on the motor housing;

[0034] FIG3 is a schematic diagram of the installation of the steel sleeve and the radial air bearing of the present invention;

[0035] Figure 4 It is a schematic diagram of the installation of the steel sleeve in the bearing sleeve of the present invention;

[0036] Figure 5 It is a structural schematic diagram of the grate teeth sealing ring of the present invention;

[0037] FIG6 is a schematic diagram of the structure of a single-layer and multi-layer elastic collar according to the present invention;

[0038] Figure 7 It is a schematic diagram of the structure and installation of the reverse air bleed nozzle of the present invention;

[0039] Figure 8 A schematic diagram of the direction of the cooling airflow for the bearing and the motor of the present invention;

[0040] Fig. 9 Schematic diagram of the overall installation structure of the present invention

[0041] Figure markings: 1-motor housing, 2-bearing sleeve, 3-vibration-damping rubber ring, 4-steel sleeve, 5-comb seal ring, 6-metal gasket, 7-anti-loosening washer, 8-elastic clamping ring, 9-stop pin, 10-air nozzle, 11-shaft, 12-motor stator, 13-motor rotor, 14-impeller, 15-interference pin, 16-fastening screw, 17-anti-loosening washer, 21-cooling channel, 22-groove, 23-ventilation hole, 41-slot, 42-air outlet. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail in combination with the embodiment of the present invention. In the example, the same or similar reference numerals throughout represent the same or similar originals or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of them. The embodiments described below by reference are exemplary and intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention. The following is a detailed description in combination with the embodiments of the present invention.

[0043] 1. In the aforementioned airborne electric compressor air bearing installation structure, a specially structured notch is opened on the steel sleeve for installing the radial bearing foil, and the notch is in the shape of an inverted trumpet with a "small outside and large inside".

[0044] 2. In the aforementioned airborne electric compressor air bearing installation structure, the bearing sleeve is installed inside the motor housing by means of screws and anti-loosening washers, the steel sleeve is installed inside the bearing sleeve by means of clearance fit, and there is a vibration-damping sealing ring between the steel sleeve and the bearing sleeve, and the number of the sealing rings is 2.

[0045] 3. In the aforementioned airborne electric compressor air bearing installation structure, sealing rings and metal gaskets are used at both ends of the steel sleeve to seal the radial air bearing and prevent axial movement of the foil. The inner ring of the sealing ring is arranged with comb teeth to achieve dynamic pressure sealing of the bearing and prevent large foreign particles from entering the bearing.

[0046] 4. In the aforementioned airborne electric compressor air bearing installation structure, a groove is processed on one side of the bearing sleeve, steel sleeve and metal gasket, and the steel sleeve is prevented from rotating in the circumferential direction by the cooperation of the groove and the stop pin.

[0047] 5. In the aforementioned airborne electric compressor air bearing installation structure, the replacement function of the sealing ring and the foil is achieved by relying on the interference pin or elastic clamp installed inside the bearing sleeve.

[0048] 6. In the aforementioned air bearing installation structure of the airborne electric compressor, the direction of the bleed nozzle head is opposite to the rotation direction of the impeller, and the impurities in the cooling air flow are filtered through the reverse bleed nozzle.

[0049] 7. In the aforementioned airborne electric compressor air bearing installation structure, there is a high-pressure cavity between the bearing sleeve and the steel sleeve, which cooperates with the uniformly distributed air inlet on the steel sleeve to achieve 360-degree full-circle cooling of the bearing.

[0050] 8. In the aforementioned air bearing installation structure of the airborne electric compressor, the outer ring of the bearing sleeve is provided with evenly distributed air holes for introducing the high-pressure gas at the back of the impeller into the motor stator for heat dissipation.

[0051] Example 1

[0052] An air bearing mounting structure for an airborne electric compressor, see Figures 1 to 8 , including motor housing, vibration-damping rubber ring, bearing sleeve, steel sleeve, sealing ring, metal gasket, sealing gasket, elastic clamping ring, stop pin, interference pin, reverse air nozzle, fastening screws, anti-loosening washers, etc.

[0053] In the above structure, the bearing sleeve is fixed to the motor housing by screws and anti-loosening washers, and the number of fastening screws and anti-loosening washers is determined according to the usage.

[0054] In the above structure, there is a clearance fit between the bearing sleeve and the steel sleeve, and there is a rubber ring for vibration reduction between the two, and the number of the rubber rings is 2.

[0055] The aforementioned steel sleeve is uniformly processed with 6 grooves 41 along the circumferential direction for inserting the air bearing foil. The groove is in the shape of an "inverted trumpet" with a "small outside and large inside" to prevent the foil from falling out and allow the overlapping foil to rotate freely to adapt to the deflection of the rotor.

[0056] A metal gasket, a comb seal ring and an elastic clamp ring are sequentially installed along the axial direction at one end of the aforementioned bearing sleeve to achieve axial fixed constraint on one side of the air bearing foil.

[0057] The other end of the aforementioned bearing sleeve is sequentially installed with a metal gasket, a comb seal ring and an interference pin along the axial direction to achieve axial fixed constraint on the other side of the air bearing foil.

[0058] The elastic clamp is in the form of a single layer with a notch, and two round holes are arranged near the opening of the clamp for easy removal.

[0059] The aforementioned bearing sleeve interference fit is equipped with a reverse air bleed nozzle, the head of which faces in the opposite direction to the impeller rotation direction, thereby achieving reverse air bleed and preventing impurities from entering the bearing.

[0060] The aforementioned bearing sleeve is processed with a cooling channel 21 in the middle, forming a cavity between the bearing sleeve and the steel sleeve. The cooling airflow first passes through the cavity, and then flows to the bearing foil for cooling through the air outlet holes 42 evenly distributed on the steel sleeve.

[0061] The aforementioned bearing sleeve, sealing gasket and steel sleeve are processed with U-shaped notches at the same angle, which cooperate with the stop pin 9 to achieve fixed constraint along the circumferential direction of the air bearing.

[0062] The outer ring of the aforementioned bearing sleeve is also processed with a circle of evenly distributed ventilation holes 23, which are used to guide the high-pressure gas on the back of the impeller to the motor stator for cooling.

[0063] The aforementioned motor housing and bearing sleeve are made of 7A04, the steel sleeve is made of 0Cr17Ni7, the comb seal ring is made of polyimide, the gasket is made of GH4169 (0.15 mm thick), and the elastic retaining ring is made of 3J68 (1 mm thick).

[0064] Example 2

[0065] In some embodiments, an air bearing mounting structure for an airborne electric compressor has the following features compared to Embodiment 1:

[0066] There is a clearance fit between the bearing sleeve and the steel sleeve, and a rubber ring for vibration reduction is installed between the two, and the number of the rubber rings is greater than 2.

[0067] The steel sleeve is uniformly processed with 5 to 10 grooves 41 along the circumferential direction for fixing the air bearing foil.

[0068] Metal gaskets, comb teeth sealing rings and elastic clamps are sequentially installed along the axial direction at both ends of the bearing sleeve to achieve axial fixed constraints on both sides of the air bearing foil.

[0069] The elastic clamp is in the form of multiple layers with notches, and a round hole is arranged near the opening of the clamp to facilitate removal.

[0070] The bearing sleeve is welded and assembled with a reverse air bleed nozzle, the head of which is oriented in the same direction as the air flow to achieve reverse air bleed.

[0071] The aforementioned bearing sleeve, sealing gasket and steel sleeve are processed with no less than two U-shaped notches along a certain same angle, and cooperate with the same number of stop pins 9 to achieve circumferential fixation of the bearing.

[0072] The motor housing and bearing sleeve are made of 2A12, the steel sleeve is made of titanium alloy or high-temperature alloy steel, the gasket is made of GH4145 or Inconcel X-750 or Inconcel X-718 (0.15 mm thick), and the elastic retaining ring is made of 65Mn (1 mm thick).

[0073] Example 2

[0074] The air bearing mounting structure for an airborne electric compressor comprises a motor housing 1, a vibration-damping rubber ring 3, a bearing sleeve 2, a steel sleeve 4, a sealing ring 5, a metal gasket 6, an anti-loosening washer 7, an elastic clamping ring 8, a stop pin 9, an air bleed nozzle 10, a shaft 11, a motor stator 12, a motor rotor 13, an impeller 14, an interference pin 15, a fastening screw 16, and an anti-loosening washer 17. The steel sleeve 4 is installed on the side of the bearing sleeve 2 close to the turbine, and a stop pin 9 is used to limit and prevent rotation. Two circumferential grooves 22 are opened on the inner wall of the bearing sleeve 2 for arranging a vibration-damping rubber ring 3. The sealing area formed by the two vibration-damping rubber rings 3 between the bearing sleeve 2 and the steel sleeve 4 constitutes a cooling channel 21. The cooling channel 21 provides cooling for the bearing. The cooling channel is connected to the air inlet on the bearing sleeve 2. An air outlet 42 is provided on the wall of the steel sleeve 4. The gas is discharged from the air outlet and provides cooling for the bearing. A sealing ring 5 is provided at one end of the steel sleeve 4 close to the turbine, and is installed on the bearing sleeve 2 by an interference pin 15. A metal gasket 6 is arranged between the steel sleeve 4 and the sealing ring 5 to prevent the sealing ring 5 from being scratched by the bearing.

[0075] Another sealing ring 5 is provided on the side of the bearing sleeve 2 close to the motor, and the sealing ring 5 is fitted on the groove 24 of the bearing sleeve 2 through an elastic retaining ring 8, and another metal gasket 6 is arranged between the steel sleeve 4 and the sealing ring 5; the bearing sleeve 2 is circumferentially provided with ventilation holes 23, and the gas generated by the rotation of the impeller 14 provides cooling gas for the motor through the ventilation holes 23;

[0076] During assembly, the bearing sleeve 2 is mounted on the motor housing 1 by means of fastening screws 16 and anti-loosening washers 17 , with an anti-loosening washer 7 in the middle, and the shaft 11 is mounted in the air bearing in the steel sleeve 4 .

[0077] In a certain implementation case of the present invention, an air bleed nozzle 10 is further included, and the air bleed nozzle 10 is arranged at the entrance of the inlet channel of the bearing sleeve 2.

[0078] In a certain embodiment of the present invention, the head of the air bleed nozzle 10 faces in the opposite direction to the rotation direction of the impeller, and the impurities in the cooling air flow are filtered through the reverse air bleed nozzle.

[0079] In a certain embodiment of the present invention, the notch 41 on the steel sleeve 4 for mounting the bearing foil is in the shape of an inverted trumpet, and the notch 41 is provided with a flat foil. By adding a gasket to the notch 41, the angle of the flat foil can be adjusted, thereby adjusting the preload force of the bearing and the rotor.

[0080] In a certain embodiment of the present invention, the inner ring of the sealing ring 5 is arranged with comb teeth to achieve dynamic pressure sealing of the bearing and prevent large particles of foreign matter from entering the bearing.

[0081] In a certain implementation case of the present invention, a groove is processed on one side of the bearing sleeve 2, the steel sleeve 4 and the metal gasket 6, and the steel sleeve is prevented from rotating in the circumferential direction by the cooperation between the groove and the stop pin 9.

[0082] In a certain embodiment of the present invention, the motor housing 1 and the bearing sleeve 2 are made of 7A04.

[0083] In a certain embodiment of the present invention, the steel sleeve 4 is made of 0Cr17Ni7.

[0084] In one embodiment of the present invention, the sealing ring 5 is made of polyimide.

[0085] In one embodiment of the present invention, the gasket material is GH4169

[0086] In a certain embodiment of the present invention, the elastic collar 8 is made of 3J68.

[0087] Working principle: When the rotor and impeller rotate at high speed, the cooling gas enters the air inlet of the bearing sleeve 2 through the reverse air nozzle 10, then enters the cooling channel 21, and enters the air outlet 42 of the steel sleeve 4 again to cool the bearing. The sealing ring 5 and the rotor are assembled with a small gap, and the cooled gas flows out through the gap; at the same time, the high-pressure gas on the back of the impeller cools the motor through the ventilation holes 23 on the bearing sleeve 2.

[0088] It is understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and unless defined as here, will not be interpreted with idealized or overly formal meanings. The specific implementation methods described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Within the spirit and principle of the present invention, any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment of equivalent changes for application in other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution content of the present invention, any modification, equivalent replacement, improvement, etc., made according to the technical essence of the present invention, should be included in the protection scope of the present invention.

Claims

1. An air bearing mounting structure for an airborne electric compressor, characterized in that: It includes a motor housing, a vibration-damping rubber ring, a bearing sleeve, a steel sleeve, a sealing ring, a metal gasket, an anti-loosening gasket, an elastic retaining ring, a stop pin, an air bleed nozzle, a shaft, a motor stator, a motor rotor, an impeller, an interference pin, a fastening screw, and an anti-loosening gasket; the steel sleeve is installed on the side of the bearing sleeve close to the turbine, and a stop pin is used to limit and prevent rotation. Two circumferential grooves are opened on the inner wall of the bearing sleeve for arranging the vibration-damping rubber ring. The sealing area formed by the two vibration-damping rubber rings between the bearing sleeve and the steel sleeve constitutes a cooling channel. The cooling channel provides cooling for the bearing. The cooling channel is connected with the air inlet on the bearing sleeve. An air outlet is provided on the wall of the steel sleeve, and the gas is discharged from the air outlet to provide cooling for the bearing; a sealing ring is provided at the end of the steel sleeve close to the turbine, and is installed on the bearing sleeve through an interference pin. A metal gasket is arranged between the steel sleeve and the sealing ring to prevent the sealing ring from being scratched by the bearing; Another sealing ring is provided on the side of the bearing sleeve close to the motor, and the sealing ring is fitted on the groove of the bearing sleeve through an elastic retaining ring, and another metal gasket is arranged between the steel sleeve and the sealing ring; the bearing sleeve is circumferentially provided with ventilation holes, and the gas generated by the rotation of the impeller provides cooling gas for the motor through the ventilation holes; during assembly, the bearing sleeve is installed on the motor housing through fastening screws and anti-loosening washers, with an anti-loosening washer in the middle, and the shaft is installed in the air bearing in the steel sleeve.

2. The structure according to claim 1, characterized in that It also includes an air bleed nozzle, which is arranged at the entrance of the inlet channel of the bearing sleeve.

3. The structure according to claim 2, characterized in that The direction of the air bleed nozzle head is opposite to the rotation direction of the impeller, and the impurities in the cooling air flow are filtered through the reverse air bleed nozzle.

4. The structure according to claim 3, characterized in that The notch on the steel sleeve for mounting the bearing foil is in the shape of an inverted trumpet, and the notch is provided with a flat foil. By adding a gasket to the notch, the angle of the flat foil can be adjusted, thereby adjusting the preload force of the bearing and the rotor.

5. The structure according to claim 4, characterized in that The inner ring of the sealing ring is arranged with comb teeth to achieve dynamic pressure sealing of the bearing and prevent large particles of foreign matter from entering the bearing.

6. The structure according to claim 5, characterized in that One side of the bearing sleeve, the steel sleeve and the metal gasket is processed with a groove, and the steel sleeve is prevented from rotating in the circumferential direction by the cooperation of the groove and the stop pin.

7. The structure according to claim 6, characterized in that The motor housing and bearing sleeve are made of 7A04.

8. The structure according to claim 7, characterized in that The material of the steel sleeve is 0Cr17Ni7.

9. The structure according to claim 8, characterized in that The sealing ring material is polyimide.

10. The structure according to claim 9, characterized in that The gasket material is GH4169 and the elastic clamp material is 3J68.

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