Radial air bearing and motor

Abstract

This invention provides a radial air bearing and a motor. The radial air bearing includes an inner bearing ring, with multiple sets of limiting holes spaced axially along the outer surface of the inner bearing ring. Each set of limiting holes includes multiple limiting holes spaced circumferentially along the outer surface of the inner bearing ring. An outer bearing ring is fitted onto the outside of the inner bearing ring, forming a gap layer between the outer bearing ring and the inner bearing ring. Multiple sets of mounting holes are spaced axially along the outer bearing ring, each set including multiple mounting holes spaced circumferentially along the outer bearing ring and penetrating the inner and outer surfaces of the outer bearing ring, and matched with corresponding limiting holes. A sealing ring is fitted onto the outside of the outer bearing ring, forming a high-pressure fluid cavity between the sealing ring and the outer bearing ring that connects to each mounting hole. Multiple vibration damping components are inserted between corresponding mounting holes and limiting holes. The vibration damping components reciprocate radially along the radial air bearing under the action of fluid flowing into the high-pressure fluid cavity and the movement of the inner bearing ring.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a radial air bearing and a motor. Background Technology

[0002] Due to their oil-free operation, frictionless operation, and simple maintenance, dynamic pressure air bearings are increasingly widely used in high-speed rotating machinery. Currently, the most commonly used dynamic pressure air bearings are foil-type bearings, mainly composed of corrugated foils and top foils. Because the thickness of the top foil in existing dynamic pressure air bearings is typically less than 0.3 mm, it is prone to deformation under film pressure during rotor operation, thus altering the film streamline and reducing the bearing's load-bearing capacity. Furthermore, since the corrugated foil is formed by pressing multiple waveforms onto a single flat foil, the deformation capacity of any particular waveform is limited by the continuous structure of the foil. Simultaneously, significant deformation of the corrugated foil can easily lead to irreversible plastic deformation, causing irreversible damage to the bearing and affecting its reliability. Summary of the Invention

[0003] This invention proposes a radial air bearing and motor to solve the technical problems of traditional foil-type dynamic pressure bearings, where the top foil is prone to deformation that damages the air film streamline and reduces the bearing load capacity, and the corrugated foil is prone to plastic deformation under heavy loads that affects the bearing reliability.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0005] This invention provides a radial air bearing, comprising:

[0006] The bearing inner ring has multiple sets of limiting holes distributed axially along the outer surface of the bearing inner ring. The sets of limiting holes include multiple limiting holes distributed circumferentially along the outer surface of the bearing inner ring.

[0007] The bearing outer ring is fitted on the outside of the bearing inner ring, and a gap layer is formed between the bearing outer ring and the bearing inner ring. Multiple mounting hole groups are distributed axially along the bearing outer ring. The mounting hole groups include multiple mounting holes that are distributed circumferentially along the bearing outer ring, penetrate the inner and outer surfaces of the bearing outer ring, and are matched with corresponding limiting holes.

[0008] A sealing ring is fitted onto the outside of the bearing outer ring, and a high-pressure fluid cavity is formed between the sealing ring and the bearing outer ring, connecting all the mounting holes.

[0009] Multiple vibration damping components are inserted between corresponding mounting holes and limiting holes. The vibration damping components reciprocate radially along the radial air bearing under the action of the fluid introduced into the high-pressure fluid chamber and the movement of the inner ring of the bearing.

[0010] Preferably, the inner wall of the mounting hole is provided with a limiting step;

[0011] The vibration damping components include:

[0012] The guide sleeve is limited and installed on the limiting step, and the end of the guide sleeve facing the inner ring of the bearing has a guide inner hole;

[0013] The movable slide rod passes through the inner hole of the guide. One end of the movable slide rod is the mating end that slides with the limiting hole, and the other end of the movable slide rod is the free end that moves inside the guide sleeve.

[0014] Preferably, the inner side of the movable slide rod is provided with a receiving cavity that connects to the interior of the guide sleeve.

[0015] Preferably, the free end protrudes to provide a second limiting member.

[0016] Preferably, the outer wall of the guide sleeve is provided with a first sealing groove, and the first sealing ring is embedded in the first sealing groove and abuts against the inner wall of the mounting hole.

[0017] Preferably, the outer wall of the movable slide rod and the mating part of the guide inner hole are provided with a second sealing groove, and the second sealing ring is embedded in the second sealing groove and abuts against the inner wall of the guide inner hole.

[0018] Preferably, the end of the mounting hole away from the inner ring of the bearing is provided with a countersunk groove, the inner side wall of the countersunk groove is provided with a limiting groove, the sliding sleeve retaining ring is embedded in the limiting groove and protrudes from the inner side wall of the countersunk groove, and the bottom wall of the countersunk groove, the inner side wall of the countersunk groove and the sliding sleeve retaining ring form a limiting step.

[0019] Preferably, the outer surface of the bearing outer ring is provided with a first groove connecting each mounting hole, the inner surface of the sealing ring is provided with a second groove matching the first groove, and the two axial ends of the sealing ring are respectively provided with a fluid inlet and a fluid outlet connecting the second groove;

[0020] The inner surface of the sealing ring fits snugly against the outer surface of the bearing outer ring, and the first groove and the second groove form a high-pressure fluid cavity.

[0021] Preferably, a pair of third sealing grooves are respectively provided on the outer surface of the bearing outer ring at the two ends of the first groove, and the third sealing ring is embedded in the third sealing groove and abuts against the inner surface of the sealing ring.

[0022] The present invention also provides an electric motor comprising the aforementioned radial air bearing.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The radial air bearing provided by this invention uses a thicker inner ring instead of the traditional top foil. The inner ring is less prone to deformation under air film pressure during operation, thus preserving the air film streamlines and improving the bearing's load-bearing capacity. Furthermore, because this invention uses a high-pressure fluid vibration damping structure (damping component) instead of the traditional corrugated foil structure, the damping component does not undergo any plastic deformation during the deformation caused by bearing vibration. This significantly improves the bearing's load-bearing capacity and deformation reliability under heavy loads. Simultaneously, it can change the bearing's stiffness and damping by altering the fluid pressure and density, thereby better matching the bearing system and enhancing the bearing's load-bearing capacity and stability. Attached Figure Description

[0025] To more clearly illustrate the technical solution proposed by this invention, the invention will be described in detail below with reference to embodiments and accompanying drawings. It should be understood that the embodiments and drawings described in the following detailed description and specification are merely some embodiments of this invention, and those skilled in the art can make changes to these drawings within the framework of this invention.

[0026] Figure 1 This is a schematic front view of an embodiment of the radial air bearing of the present invention. Figure 1 ;

[0027] Figure 2 This is a schematic front view of an embodiment of the radial air bearing of the present invention. Figure 2 ;

[0028] Figure 3 for Figure 2 A magnified schematic diagram of a portion of region A in the diagram;

[0029] Figure 4 This is an exploded structural diagram of an embodiment of the radial air bearing of the present invention;

[0030] Figure 5 This is a schematic cross-sectional view of an embodiment of the radial air bearing of the present invention. Figure 1 ;

[0031] Figure 6 This is a schematic cross-sectional view of an embodiment of the radial air bearing of the present invention. Figure 2 ;

[0032] Figure 7 for Figure 6 A magnified schematic diagram of the local structure of region B in the diagram;

[0033] Figure 8 for Figure 6 A magnified schematic diagram of the local structure of region C in the diagram;

[0034] Figure 9This is a cross-sectional view of another embodiment of the radial air bearing of the present invention;

[0035] Figure 10 This is a rear view structural schematic diagram of an embodiment of the radial air bearing of the present invention;

[0036] Figure 11 This is a left-side structural schematic diagram of an embodiment of the radial air bearing of the present invention;

[0037] Figure 12 This is a right-side structural schematic diagram of an embodiment of the radial air bearing of the present invention;

[0038] Figure 13 This is a top view schematic diagram of an embodiment of the radial air bearing of the present invention;

[0039] Figure 14 This is a bottom view schematic diagram of an embodiment of the radial air bearing of the present invention.

[0040] The main markings in the attached figures are as follows:

[0041] 1. Bearing inner ring; 11. Limiting hole assembly; 111. Limiting hole;

[0042] 2. Bearing outer ring; 21. Mounting hole assembly; 211. Mounting hole; 2111. Limiting step; 2112. Countersunk groove; 2113. Limiting groove; 2114. Sliding sleeve retaining ring; 22. First groove; 23. Third sealing groove;

[0043] 3. Gap layer;

[0044] 4. Sealing ring; 41. Second groove; 42. Fluid inlet; 43. Fluid outlet;

[0045] 5. High-pressure fluid chamber;

[0046] 6. Vibration damping assembly; 61. Guide sleeve; 611. Guide inner hole; 612. First sealing groove; 62. Movable slide rod; 621. Mating end; 622. Free end; 6221. Second limiting member; 623. Receiving cavity; 624. Limiting slot; 625. First limiting member; 626. Second sealing groove;

[0047] 7. First sealing ring;

[0048] 8. Second sealing ring;

[0049] 9. Third sealing ring. Detailed Implementation

[0050] To make the technical problem to be solved, the technical solution and the beneficial effects of the present invention clearer, the following description is provided in conjunction with the appendix. Figure 1-14The present invention will be further described in detail below with reference to the embodiments.

[0051] Please refer to the following: Figure 1-14 The radial air bearing provided by the present invention includes:

[0052] The bearing inner ring 1 has multiple limiting hole groups 11 distributed axially along the outer surface of the bearing inner ring 1. The limiting hole group 11 includes multiple limiting holes 111 distributed circumferentially along the outer surface of the bearing inner ring 1.

[0053] The bearing outer ring 2 is sleeved on the outside of the bearing inner ring 1, and a gap layer 3 is formed between the bearing outer ring 2 and the bearing inner ring 1. Multiple mounting hole groups 21 are distributed at intervals along the axial direction of the bearing outer ring 2. The mounting hole group 21 includes multiple mounting holes 211 that are distributed at intervals along the circumference of the bearing outer ring 2 and penetrate the inner and outer surfaces of the bearing outer ring 2. The multiple mounting holes 211 are respectively matched with each limiting hole 111.

[0054] A sealing ring 4 is fitted on the outside of the bearing outer ring 2, and a high-pressure fluid cavity 5 is formed between the sealing ring 4 and the bearing outer ring 2, which connects to each mounting hole 211.

[0055] Multiple vibration damping components 6 are inserted between corresponding mounting holes 211 and limiting holes 111. Under the action of fluid pressure entering the high-pressure fluid chamber 5 and the movement of the bearing inner ring 1 under load (such as vibration or displacement), the vibration damping components 6 reciprocate radially along the radial air bearing through the guiding cooperation with the mounting holes 211 and limiting holes 111.

[0056] Therefore, when the inner ring 1 of the bearing is under load, the combined action of the fluid pressure introduced into the high-pressure fluid chamber 5 and the movement of the inner ring 1 of the bearing can drive the vibration damping component 6 to reciprocate along the radial direction of the radial air bearing between the mounting hole 211 and the limiting hole 111. This allows the high-pressure fluid to absorb the vibration energy of the inner ring 1 of the bearing through the reciprocating motion of the vibration damping component 6, thereby improving the load-bearing capacity, stability and reliability of the radial air bearing system.

[0057] The radial air bearing provided by this invention uses a thicker inner ring instead of the traditional top foil. The inner ring is less prone to deformation under air film pressure during operation, thus preventing disruption of the air film streamlines and improving bearing load capacity. Furthermore, because this invention uses a high-pressure fluid vibration damping structure (damping component 6) instead of the traditional corrugated foil structure, the damping component 6 does not undergo any plastic deformation during bearing vibration-induced deformation, significantly improving the bearing's load capacity and deformation reliability under heavy loads. Simultaneously, it can change the bearing's stiffness and damping by altering the fluid pressure and density, thereby better matching the bearing system and improving the bearing's load capacity and stability.

[0058] Please refer to the following: Figure 1-5 In one embodiment of the radial air bearing provided by the present invention, the inner ring 1 of the bearing is made of a thicker steel ring, preferably with a thickness of >1mm, so that the inner ring 1 of the bearing will hardly deform under the air film pressure, thus not damaging the air film structure and effectively improving the load-bearing capacity of the radial air bearing.

[0059] Please refer to the following: Figure 4-7 In one embodiment of the radial air bearing provided by the present invention, the inner wall of the mounting hole 211 of the outer ring 2 of the bearing is provided with a limiting step 2111 for limiting the installation of the vibration damping component 6.

[0060] Vibration damping component 6 includes:

[0061] Guide sleeve 61, which is limited and installed on the limiting step 2111, has a guide inner hole 611 at one end of the guide sleeve 61 facing the inner ring 1 of the bearing.

[0062] The movable slide rod 62 passes through the guide inner hole 611. One end of the movable slide rod 62 is a mating end 621 that extends into the limiting hole 111 and slides in cooperation with the limiting hole 111. The other end of the movable slide rod 62 is a free end 622 that moves inside the guide sleeve 61.

[0063] Please refer to the following: Figure 4-7 In a more preferred embodiment of the radial air bearing provided by the present invention, the inner side of the movable slide rod 62 is provided with a receiving cavity 623 that connects to the interior of the guide sleeve 61. That is, the movable slide rod 62 is hollow. The mating end 621 of the movable slide rod 62 that extends into the limiting hole 111 and slides with the limiting hole 111 is a closed end. The free end 622 of the movable slide rod 62 that moves away from (opposite to) the inner ring 1 of the bearing and moves inside the guide sleeve 61 is an open end. The receiving cavity 623 connects to the interior of the guide sleeve 61 through the open end 622.

[0064] Therefore, when the high-pressure fluid enters the high-pressure fluid chamber 5 and the receiving cavity 623 inside the guide sleeve 61 and the movable slide rod 62, the movable slide rod 62 can be pushed up by the high-pressure fluid along the radial direction of the radial air bearing towards the inner ring 1 of the bearing under the pressure of the high-pressure fluid and the guiding action of the guide sleeve 61 and the limiting hole 111. When the inner ring 1 of the bearing is under load and moves up and down along the radial direction of the radial air bearing (such as displacement or vibration), the movable slide rod 62 can move up and down accordingly. Therefore, the high-pressure fluid can effectively absorb the energy of the vibration of the inner ring 1 of the bearing, thereby improving the stability and reliability of the bearing.

[0065] Please refer to the following: Figure 4-7 In a preferred embodiment of the radial air bearing provided by the present invention, the movable slide bar 62 is provided with a first limiting member 625 through the protrusion of the gap layer 3.

[0066] Therefore, the first limiting member 625 can cooperate with the outer surface of the inner ring 1 and the inner surface of the outer ring 2 of the bearing to limit the travel of the movable slide rod 62 in the radial reciprocating motion of the radial air bearing and prevent its travel from exceeding the limit.

[0067] Please refer to the following: Figure 4-7 In a more preferred embodiment of the radial air bearing provided by the present invention, the outer side wall of the portion of the movable slide rod 62 that passes through the gap layer 3 is provided with a limiting groove 624, and the first limiting member 625 is a first limiting retaining ring embedded in the limiting groove 624, the first limiting retaining ring protruding from the outer side wall of the movable slide rod 62.

[0068] Please refer to the following: Figure 4-7 In a preferred embodiment of the radial air bearing provided by the present invention, a second limiting member 6221 is provided at the free end 622 of the movable slide rod 62 along the radial protrusion of the movable slide rod 62.

[0069] Therefore, the second limiting member 6221 can cooperate with the end face of the guide sleeve 61 facing the inner ring 1 of the bearing (i.e. the end face with the guide inner hole 611) to limit the travel of the movable slide rod 62 in the radial reciprocating motion of the radial air bearing and prevent its travel from exceeding the limit.

[0070] Please refer to the following: Figure 4-7 In a more preferred embodiment of the radial air bearing provided by the present invention, the second limiting member 6221 is a second limiting retaining ring provided along the radial protrusion of the movable slide rod 62.

[0071] Please refer to the following: Figure 4-7 In a preferred embodiment of the radial air bearing provided by the present invention, the outer wall of the guide sleeve 61 is provided with a first sealing groove 612, and the first sealing ring 7 is embedded in the first sealing groove 612 and abuts against the inner wall of the mounting hole 211.

[0072] Therefore, a first sealing structure can be formed between the outer wall of the guide sleeve 61 and the inner wall of the mounting hole 211 by the first sealing ring 7, so as to prevent the high pressure fluid entering the high pressure fluid cavity 5 from leaking from the mating point between the guide sleeve 61 and the bearing outer ring 2.

[0073] Please refer to the following: Figure 4-7 In a preferred embodiment of the radial air bearing provided by the present invention, the outer wall of the movable slide rod 62 and the mating part of the guide inner hole 611 are provided with a second sealing groove 626, and the second sealing ring 8 is embedded in the second sealing groove 626 and abuts against the inner wall of the guide inner hole 611.

[0074] Therefore, a second sealing structure can be formed between the outer wall of the movable slide rod 62 and the inner wall of the guide inner hole 611 through the second sealing ring 8, so as to prevent the high pressure fluid entering the high pressure fluid cavity 5 from leaking from the mating point between the movable slide rod 62 and the guide sleeve 61.

[0075] Please refer to the following: Figure 4-7 In a preferred embodiment of the radial air bearing provided by the present invention, a countersunk groove 2112 is provided at the end of the mounting hole 211 away from the inner ring 1 of the bearing. A limiting groove 2113 is provided on the inner side wall of the countersunk groove 2112. A sliding sleeve retaining ring 2114 is embedded in the limiting groove 2113 and protrudes from the inner side wall of the countersunk groove 2112. The bottom wall of the countersunk groove 2112, the inner side wall of the countersunk groove 2112 and the sliding sleeve retaining ring 2114 form a limiting step 2111.

[0076] In a preferred embodiment of the radial air bearing provided by the invention, only one set of limiting hole group 11, mounting hole 211 and vibration damping component 6 is provided along the axial direction of the radial air bearing.

[0077] Please refer to the following: Figure 1-4 In a preferred embodiment of the radial air bearing provided by the invention, the limiting hole group 11, the mounting hole 211 and the vibration damping component 6 are arranged in at least three sets at uniform intervals along the axial direction of the radial air bearing, so that the rotor is subjected to uniform force in the axial direction.

[0078] In a preferred embodiment of the radial air bearing provided by the invention, the limiting hole group 11 has three limiting holes 111 evenly spaced along the circumference of the inner ring 1 of the bearing, and the mounting hole group 21 has three mounting holes 211 spaced along the circumference of the outer ring 2 of the bearing.

[0079] Please refer to the following: Figure 1-4 In a preferred embodiment of the radial air bearing provided by the invention, the limiting hole group 11 has four to eight limiting holes 111 evenly spaced along the circumference of the inner ring 1 of the bearing, and the mounting hole group 21 has four to eight mounting holes 211 spaced along the circumference of the outer ring 2 of the bearing, so that the radial air bearing is subjected to more uniform force in the circumferential direction, thereby improving the stability of the bearing.

[0080] Please refer to the following: Figure 6-8 In a preferred embodiment of the radial air bearing provided by the present invention, the outer surface of the bearing outer ring 2 is provided with a first groove 22 that connects to each mounting hole 211, the inner surface of the sealing ring 4 is provided with a second groove 41 that matches the first groove 22, and the two axial ends of the sealing ring 4 are respectively provided with a fluid inlet 42 and a fluid outlet 43 that connect to the second groove 41.

[0081] The inner surface of the sealing ring 4 fits against the outer surface of the bearing outer ring 2, and the first groove 22 and the second groove 41 form the high-pressure fluid cavity 5.

[0082] Please refer to the following: Figure 6 , 8 In a more preferred embodiment of the radial air bearing provided by the present invention, a pair of third sealing grooves 23 are respectively provided on the outer surface of the bearing outer ring 2 at the two ends of the first groove 22. The third sealing ring 9 is embedded in the third sealing groove 23 and abuts against the inner surface of the sealing ring 4.

[0083] Therefore, a third sealing structure can be formed between the outer surface of the bearing outer ring 2 and the inner surface of the sealing ring 4 through the third sealing ring 9, so as to prevent the high pressure fluid entering the high pressure fluid cavity 5 from leaking from the mating point between the bearing outer ring 2 and the sealing ring 4.

[0084] Please refer to the following: Figure 5-6 In a preferred embodiment of the radial air bearing provided by the present invention, the fluid inlet 42 and the fluid outlet 43 are offset at both ends of the sealing ring 4 in the axial direction, that is, the fluid inlet 42 and the fluid outlet 43 are located in the diagonal direction of the sealing ring 4.

[0085] This prevents high pressure from flowing into the high-pressure fluid chamber 5 from the fluid inlet 42 at one end of the radial air bearing and then rapidly flowing out from the fluid outlet 43 at the other end of the radial air bearing, thus avoiding low fluid pressure at other locations in the chamber.

[0086] Please see Figure 9 In one embodiment of the radial air bearing provided by the present invention, the fluid inlet 42 and the fluid outlet 43 are arranged opposite each other at the two axial ends of the sealing ring 4.

[0087] The present invention also provides an electric motor comprising the aforementioned radial air bearing.

[0088] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art should understand that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A radial air foil bearing characterized by, include: The bearing inner ring (1) has multiple limiting hole groups (11) distributed at intervals along the axial direction of the bearing inner ring (1) on the outer surface of the bearing inner ring (1). The limiting hole group (11) includes multiple limiting holes (111) distributed at intervals along the circumferential direction of the bearing inner ring (1) on the outer surface of the bearing inner ring (1). The bearing outer ring (2) is sleeved on the outside of the bearing inner ring (1), and a gap layer (3) is formed between the bearing outer ring (2) and the bearing inner ring (1). Multiple mounting hole groups (21) are distributed at intervals along the axial direction of the bearing outer ring (2). The mounting hole group (21) includes multiple mounting holes (211) that are distributed at intervals along the circumferential direction of the bearing outer ring (2), penetrate the inner and outer surfaces of the bearing outer ring (2), and are matched with the corresponding limiting holes (111). A sealing ring (4) is fitted on the outside of the bearing outer ring (2), and a high-pressure fluid cavity (5) is formed between the sealing ring (4) and the bearing outer ring (2) to connect the various mounting holes (211); Multiple vibration damping components (6) are inserted between corresponding mounting holes (211) and limiting holes (111). The vibration damping components (6) reciprocate radially along the radial air bearing under the action of the fluid entering the high-pressure fluid cavity (5) and the movement of the bearing inner ring (1).

2. The radial air foil bearing of claim 1 wherein, The inner wall of the mounting hole (211) is provided with a limiting step (2111); The vibration damping component (6) includes: A guide sleeve (61) is installed on the limiting step (2111) and the guide sleeve (61) has a guide inner hole (611) at one end facing the bearing inner ring (1). The movable slide rod (62) is inserted into the guide inner hole (611). One end of the movable slide rod (62) is the mating end (621) that slides with the limiting hole (111), and the other end of the movable slide rod (62) is the free end (622) that moves inside the guide sleeve (61).

3. The radial air foil bearing of claim 2 wherein, The movable slide bar (62) has a first limiting member (625) protruding through the gap layer (3).

4. The radial air foil bearing of claim 2 wherein, The inner side of the movable slide rod (62) is provided with a receiving cavity (623) that connects to the interior of the guide sleeve (61).

5. The radial air foil bearing of claim 2 wherein, The outer wall of the guide sleeve (61) is provided with a first sealing groove (612), and the first sealing ring (7) is embedded in the first sealing groove (612) and abuts against the inner wall of the mounting hole (211).

6. The radial air foil bearing of claim 2 wherein, The outer wall of the movable slide rod (62) and the mating part of the guide inner hole (611) are provided with a second sealing groove (626), and the second sealing ring (8) is embedded in the second sealing groove (626) and abuts against the inner wall of the guide inner hole (611).

7. The radial air bearing as described in claim 2, characterized in that, The mounting hole (211) has a countersunk groove (2112) at one end away from the inner ring (1) of the bearing. The inner wall of the countersunk groove (2112) has a limiting groove (2113). The sliding sleeve retaining ring (2114) is embedded in the limiting groove (2113) and protrudes from the inner wall of the countersunk groove (2112). The bottom wall of the countersunk groove (2112), the inner wall of the countersunk groove (2112), and the sliding sleeve retaining ring (2114) form the limiting step (2111).

8. The radial air foil bearing of any one of claims 1-7, wherein, The outer surface of the bearing outer ring (2) is provided with a first groove (22) that connects to each of the mounting holes (211), and the inner surface of the sealing ring (4) is provided with a second groove (41) that matches the first groove (22). The two axial ends of the sealing ring (4) are respectively provided with a fluid inlet (42) and a fluid outlet (43) that connect to the second groove (41). The inner surface of the sealing ring (4) fits against the outer surface of the bearing outer ring (2), and the first groove (22) and the second groove (41) form the high-pressure fluid cavity (5).

9. The radial air foil bearing of claim 8 wherein, A pair of third sealing grooves (23) are respectively provided on the outer surface of the bearing outer ring (2) at the two ends of the first groove (22) along the axial direction. The third sealing ring (9) is embedded in the third sealing groove (23) and abuts against the inner surface of the sealing ring (4).

10. An electric motor comprising a radial air bearing as described in any one of claims 1-9.

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