Radial gas foil bearings, air compressors, automobiles and aircraft

Abstract

The present invention discloses a radial gas foil bearing, an air compressor, a car and an airplane, and relates to the technical field of gas foil bearings, and solves the problem of insufficient local rigidity of radial gas foil bearings under operating conditions with large impact in the prior art. The radial gas foil bearing of the present invention comprises a bearing shell, an elastic support metal wire mesh and a support top foil, the support top foil is located on the inner side of the bearing shell, the elastic support metal wire mesh is located between the bearing shell and the support top foil, the elastic support metal wire mesh is provided with multiple groups of elastic support units along the circumferential and axial directions of the bearing, and the elastic support unit comprises multiple support beams of different lengths. The radial gas foil bearing of the present invention has the advantages of high operating accuracy, high stability and reliability, and a wide range of operating conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of gas foil bearings, and in particular to a radial gas foil bearing, an air compressor comprising the radial gas foil bearing, and a car and an airplane using the air compressor. Background Art

[0002] Gas-lubricated bearings are bearings that use gas as a lubricating medium. The principle is that the fluid forms a thin film under the action of external pressure to support external loads. At present, gas-lubricated bearings can be divided into dynamic pressure gas bearings, static pressure gas bearings and extrusion gas bearings according to the different processes of lubricating gas film generation. Gas lubrication technology has developed rapidly in the 1950s. The emergence of gas lubrication technology has greatly enriched the types of lubricated bearings. Especially under the working conditions of simple structure, few transmission parts and high speed, traditional oil-lubricated sliding bearings are more likely to expose their problems such as excessive energy consumption, low linear speed and insufficient stability. Gas-lubricated bearings are often selected as ideal substitutes for traditional oil-lubricated bearings due to their high speed, high precision, high reliability, oil-free lubrication, low friction loss and ability to work in high temperature environments. Especially in the field of ultra-high-speed rotating machinery technology, gas-lubricated bearings have a very broad application prospect.

[0003] However, the current hydrodynamic gas bearings or static gas bearings have certain limitations during use, and in most cases cannot meet the requirements of some complex and harsh working conditions. For example, the traditional hydrodynamic gas bearing uses the wedge effect generated by the wedge space formed between the rotor and the bearing surface. As the rotor speed continues to increase, due to the viscosity of the gas, the surrounding gas is continuously dragged into the wedge space, so that the air pressure in the wedge space continues to increase. Only when the bearing speed reaches a certain value can a hydrodynamic gas film be formed, thus entering a stable gas lubrication state. Under the hydrodynamic effect, the higher the speed, the higher the bearing's load-bearing capacity. However, under some complex and harsh operating conditions with large impacts, such as the hydrodynamic bearings used in aircraft air cycle machines and the gas foil bearings in automotive fuel cell air compressors used in hydrogen fuel vehicles, due to the extremely large gravitational acceleration during aircraft acceleration and the instantaneous huge acceleration impact caused by changes in road conditions during vehicle operation, the top foil and wave foil positions of the traditional hydrodynamic foil bearings in contact with the rotor are instantly subjected to huge impact forces several times or even dozens of times the gravity of the rotor, causing severe plastic deformation of the wave foil of the hydrodynamic gas foil bearing, thereby affecting the fit clearance between the rotor and the bearing, which will directly lead to a sharp decline in the operating accuracy and reliability of the gas bearing.

[0004] The prior art discloses a gas foil radial bearing, which has two layers of elastic support foils, and the two layers of elastic support foils include a plurality of elastic small pieces with varying sizes. Specifically, the size of the elastic small pieces gradually increases from the two ends of the elastic support foil to the middle of the elastic support foil. The gas foil radial bearing uses elastic small pieces with varying sizes to make the middle of the elastic support foil have greater rigidity, so that the deformation degree of the elastic small pieces in the middle and at the two ends is consistent. Although the overall deformation degree of this elastic support foil is consistent, there is a defect of insufficient rigidity for the local parts of the elastic support foil, such as the two ends of the elastic support foil, under operating conditions with large impact, which can easily lead to a sharp decrease in the operating accuracy and reliability of the gas foil radial bearing. Summary of the invention

[0005] One of the purposes of the present invention is to provide a radial gas foil bearing, which solves the technical problem of insufficient local rigidity of the radial gas foil bearing in the prior art under operating conditions with large impact. The many technical effects that can be produced by the preferred technical solution of the present invention are described in detail below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The radial gas foil bearing of the present invention comprises a bearing shell, an elastic supporting metal wire mesh and a supporting top foil, wherein the supporting top foil is located on the inner side of the bearing shell, and the elastic supporting metal wire mesh is located between the bearing shell and the supporting top foil, wherein the elastic supporting metal wire mesh is provided with a plurality of groups of elastic supporting units along the circumferential and axial directions of the bearing, and the elastic supporting units include a plurality of supporting beams of different lengths.

[0008] According to a preferred embodiment, in the circumferential direction of the bearing, the length gradient trends of the support beams of two adjacent groups of the elastic support units are opposite, and in the axial direction of the bearing, the length gradient trends of the support beams of two adjacent groups of the elastic support units are the same and / or opposite.

[0009] According to a preferred embodiment, in the circumferential direction of the bearing, the length changes of the support beams of two adjacent groups of the elastic support units are respectively increasing and decreasing in sequence, and in the axial direction of the bearing, the length changes of the support beams of two adjacent groups of the elastic support units are both increasing or both decreasing in sequence; or in the circumferential direction of the bearing, the length changes of the support beams of two adjacent groups of the elastic support units are respectively decreasing and increasing in sequence, and in the axial direction of the bearing, the length changes of the support beams of two adjacent groups of the elastic support units are both decreasing or increasing in sequence.

[0010] According to a preferred embodiment, the elastic support unit includes a first support beam, a second support beam and a third support beam, and the first support beam, the second support beam and the third support beam are arranged at intervals and their lengths increase sequentially.

[0011] According to a preferred embodiment, the length difference between adjacent ones of the first support beam, the second support beam and the third support beam is 1-3 mm.

[0012] According to a preferred embodiment, the widths of the first support beam, the second support beam and the third support beam are the same, and the widths of the first support beam, the second support beam and the third support beam are 0.8-1.5 mm.

[0013] According to a preferred embodiment, the elastic supporting wire mesh is evenly distributed with at least ten groups of the elastic supporting units along the circumferential direction of the bearing, and the elastic supporting wire mesh is evenly distributed with at least four groups of the elastic supporting units along the axial direction of the bearing.

[0014] According to a preferred embodiment, the elastic supporting metal wire mesh is an integrated structure, and the supporting top foil is an integrated structure.

[0015] According to a preferred embodiment, a wire groove is provided inside the bearing shell, the elastic supporting wire mesh and the supporting top foil are located in the wire groove, and the width of the wire groove in the radial direction of the bearing is greater than the sum of the thicknesses of the elastic supporting wire mesh and the supporting top foil.

[0016] According to a preferred embodiment, the width of the wire groove in the radial direction of the bearing is 0.3-0.5 mm greater than the sum of the thicknesses of the elastic supporting metal wire mesh and the supporting top foil.

[0017] Another object of the present invention is to provide an air compressor, a car and an airplane which improve the performance of existing air compressors, cars and airplanes.

[0018] The air compressor of the present invention comprises the radial gas foil bearing described in any one of the technical solutions of the present invention.

[0019] The automobile of the present invention comprises the air compressor described in any one of the technical solutions of the present invention.

[0020] The aircraft of the present invention comprises the air compressor described in any one of the technical solutions of the present invention.

[0021] The radial gas foil bearing, air compressor, automobile and aircraft provided by the present invention have at least the following beneficial technical effects:

[0022] The radial gas foil bearing of the present invention replaces the traditional support wave foil with an elastic support metal wire mesh. The elastic support metal wire mesh is composed of multiple groups of elastic support units, each of which includes multiple support beams of different lengths. During operation, the group of support beams with the longest length deforms first. When the pressure given by the rotor continues to increase, the support beams with successively decreasing lengths deform in succession, and the support beam with the shortest length deforms last. Since the length of each group of beams in this elastic support unit is relatively short, each group of beams has a very high bending strength, which can ensure that the elastic support unit still only undergoes elastic deformation under a large load, so that when the radial gas foil bearing works in a huge impact and a strong gravity field, the elastic support metal wire mesh still only undergoes elastic deformation. When the strong impact disappears or the gravity field returns to normal, the elastic support metal wire mesh returns to its original position, and the bearing size remains normal, instead of the metal wave foil possibly undergoing permanent plastic deformation and causing abnormal operation of the gas foil bearing. Second, due to different loads, the order of action of each support beam in the elastic support unit is different, so that the radial gas foil bearing maintains variable stiffness in both the axial and radial directions, and the overall stiffness of the elastic support metal wire mesh is evenly distributed, which is easy to form a wedge-shaped air film, thereby greatly ensuring the stability and reliability of the radial gas foil bearing and the breadth of the operating conditions. Third, since the elastic support metal wire mesh is provided with multiple groups of elastic support units along the circumferential and axial directions of the bearing, the stiffness of each group of elastic support units is consistent, which can further make the overall stiffness of the elastic support metal wire mesh evenly distributed. Under the operating conditions with large impact, the elastic support metal wire mesh can maintain sufficient rigidity everywhere, thereby further ensuring the stability and reliability of the radial gas foil bearing and the breadth of the operating conditions. That is, the radial gas foil bearing of the present invention solves the technical problem of insufficient local rigidity of the radial gas foil bearing under the operating conditions with large impact in the prior art.

[0023] The air compressor of the present invention includes the radial gas foil bearing of any technical solution in the present invention. Since the radial gas foil bearing has the advantages of high operating accuracy, high stability and reliability, and a wide range of operating conditions, it can improve the performance of the air compressor and expand the application field of the air compressor.

[0024] The automobile of the present invention comprises an air compressor according to any one of the technical solutions of the present invention. Since the performance of the air compressor is improved, the performance of the automobile can be improved.

[0025] The aircraft of the present invention comprises an air compressor according to any one of the technical solutions of the present invention. Since the performance of the air compressor is improved, the performance of the aircraft can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the exploded structure of a preferred embodiment of the radial gas foil bearing of the present invention;

[0028] Figure 2 It is a schematic diagram of the overall structure of a preferred embodiment of a radial gas foil bearing of the present invention;

[0029] Figure 3 It is a partial structural schematic diagram of a preferred embodiment of the radial gas foil bearing of the present invention;

[0030] Figure 4 1 is a schematic diagram of an expansion of a preferred embodiment of the elastically supported metal wire mesh of the present invention;

[0031] Figure 5 is a schematic diagram of the force deformation of the third support beam of the present invention;

[0032] Figure 6 It is a schematic diagram of the force deformation of the second support beam and the third support beam of the present invention.

[0033] In the figure: 10, bearing shell; 101, wire trough; 20, elastic supporting wire mesh; 201, elastic supporting unit; 2011, first supporting beam; 2012, second supporting beam; 2013, third supporting beam; 30, supporting top foil. DETAILED DESCRIPTION

[0034] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0035] The following is attached to the instruction manual Figures 1 to 6 And Examples 1 to 4 describe in detail the radial gas foil bearing, air compressor, automobile and aircraft of the present invention.

[0036] Example 1

[0037] This embodiment describes the radial gas foil bearing of the present invention in detail.

[0038] The radial gas foil bearing of this embodiment includes a bearing shell 10, an elastic supporting metal wire mesh 20 and a supporting top foil 30, wherein the supporting top foil 30 is located inside the bearing shell 10, and the elastic supporting metal wire mesh 20 is located between the bearing shell 10 and the supporting top foil 30. Figures 1 to 3 Preferably, the elastic support wire mesh 20 is provided with a plurality of sets of elastic support units 201 along the circumferential direction and the axial direction of the bearing, and the elastic support unit 201 includes a plurality of support beams of different lengths. The circumferential direction of the bearing mentioned in this embodiment is the length direction of the elastic support wire mesh 20 after it is unfolded, or the lateral direction of the elastic support wire mesh 20 after it is unfolded, such as Figure 4 As shown; the axial direction of the bearing in this embodiment is the width direction of the elastically supported metal wire mesh 20 after it is unfolded, or the vertical direction of the elastically supported metal wire mesh 20 after it is unfolded, such as Figure 4 shown.

[0039] The radial gas foil bearing of the present embodiment replaces the traditional support wave foil with an elastic support metal wire mesh 20. The elastic support metal wire mesh 20 is composed of multiple groups of elastic support units 201. Each elastic support unit 201 includes multiple support beams of different lengths. During operation, the group of support beams with the longest length deforms first. When the pressure given by the rotor continues to increase, the support beams with successively decreasing lengths deform in succession, and the support beam with the shortest length deforms last. Since the length of each group of beams in this elastic support unit 201 is relatively short, each group of beams has a very high bending strength, which can ensure that the elastic support unit 201 still only undergoes elastic deformation under a large load, so that when the radial gas foil bearing works in a huge impact and a strong gravity field, the elastic support metal wire mesh 20 still only undergoes elastic deformation. When the strong impact disappears or the gravity field returns to normal, the elastic support metal wire mesh 20 returns to its original position, and the bearing size remains normal, instead of the metal wave foil possibly undergoing permanent plastic deformation and causing abnormal operation of the gas foil bearing. Second, due to different loads, the order of action of each support beam in the elastic support unit 201 is different, so that the radial gas foil bearing maintains variable stiffness in both the axial and radial directions, and the overall stiffness distribution of the elastic support metal wire mesh 20 is uniform, which is easy to form a wedge-shaped air film, thereby greatly ensuring the stability and reliability of the radial gas foil bearing and the breadth of the operating conditions. Third, since the elastic support metal wire mesh 20 is provided with multiple groups of elastic support units 201 along the circumferential and axial directions of the bearing, the stiffness of each group of elastic support units 201 is consistent, so that the overall stiffness distribution of the elastic support metal wire mesh 20 can be further uniform. Under the operating conditions with large impact, the elastic support metal wire mesh 20 can maintain sufficient rigidity everywhere, thereby further ensuring the stability and reliability of the radial gas foil bearing and the breadth of the operating conditions. That is, the radial gas foil bearing of this embodiment solves the technical problem of insufficient local rigidity of the radial gas foil bearing under the operating conditions with large impact in the prior art.

[0040] According to a preferred embodiment, in the circumferential direction of the bearing, the length gradient trends of the support beams of two adjacent groups of elastic support units 201 are opposite, and in the axial direction of the bearing, the length gradient trends of the support beams of two adjacent groups of elastic support units 201 are the same and / or opposite. Preferably, in the circumferential direction of the bearing, the length gradient trends of the support beams of two adjacent groups of elastic support units 201 are opposite, and in the axial direction of the bearing, the length gradient trends of the support beams of two adjacent groups of elastic support units 201 are the same. More preferably, in the circumferential direction of the bearing, the length changes of the support beams of two adjacent groups of elastic support units 201 are respectively increasing and decreasing in sequence, and in the axial direction of the bearing, the length changes of the support beams of two adjacent groups of elastic support units 201 are both increasing or decreasing in sequence. Or in the circumferential direction of the bearing, the length changes of the support beams of two adjacent groups of elastic support units 201 are respectively decreasing and increasing in sequence, and in the axial direction of the bearing, the length changes of the support beams of two adjacent groups of elastic support units 201 are both decreasing or increasing in sequence.

[0041] In the radial gas foil bearing of the preferred technical solution of the present embodiment, in the circumferential direction of the bearing, the length gradient trends of the support beams of two adjacent groups of elastic support units 201 are opposite, and in the axial direction of the bearing, the length gradient trends of the support beams of two adjacent groups of elastic support units 201 are the same, that is, the support beams of different lengths are cross-arranged, which can further make the overall stiffness distribution of the elastic support metal wire mesh 20 even. Under operating conditions with large impact, the elastic support metal wire mesh 20 can maintain sufficient rigidity everywhere, thereby further ensuring the stable reliability of the radial gas foil bearing and the breadth of operating conditions.

[0042] According to a preferred embodiment, the elastic support unit 201 includes a first support beam 2011, a second support beam 2012 and a third support beam 2013, and the first support beam 2011, the second support beam 2012 and the third support beam 2013 are arranged at intervals and their lengths increase successively, such as Figure 4 As shown. Preferably, the length difference between the adjacent first support beam 2011, the second support beam 2012 and the third support beam 2013 is 1-3 mm. Preferably, the widths of the first support beam 2011, the second support beam 2012 and the third support beam 2013 are the same, and the widths of the first support beam 2011, the second support beam 2012 and the third support beam 2013 are 0.8-1.5 mm. Preferably, the widths of the first support beam 2011, the second support beam 2012 and the third support beam 2013 may also be different, and support beams of different widths also have different stiffnesses. Specifically, during operation, the smaller the width of the support beam and the longer the length, the deformation occurs first; the wider the width of the support beam and the shorter the length, the later the deformation occurs.

[0043] The elastic support unit 201 of the preferred technical solution of this embodiment includes a first support beam 2011, a second support beam 2012 and a third support beam 2013. The first support beam 2011, the second support beam 2012 and the third support beam 2013 are arranged at intervals and their lengths increase successively. During operation, the third support beam 2013 with the longest length is deformed first. At this time, the first support beam 2011 and the second support beam 2012 have not yet been deformed and have not come into contact with the bearing shell 10, so they can play a supporting role and are easy to form a wedge-shaped gas film, thereby greatly ensuring the stable reliability of the radial gas foil bearing operation. Specifically, Figure 5 As shown; when the pressure given by the rotor continues to increase or the rotor is subjected to a large impact force, the second support beam 2012 is deformed successively, and the first support beam 2011 has not yet deformed and is not in contact with the bearing shell 10, which can play a supporting role and facilitate the formation of a wedge-shaped gas film, thereby greatly ensuring the stability and reliability of the radial gas foil bearing. Figure 6 As shown; when the load or impact force continues to increase, the first support beam 2011, the second support beam 2012 and the third support beam 2013 all undergo elastic deformation. At this time, the first support beam 2011, the second support beam 2012 and the third support beam 2013 are close to the inner surface of the bearing shell 10. When the load or impact force disappears, the first support beam 2011, the second support beam 2012 and the third support beam 2013 undergo elastic deformation and can quickly rebound to restore the original structure. The elastic support wire mesh 20 returns to its original position and the bearing size remains normal.

[0044] Without being limited thereto, the elastic support unit 201 of the preferred technical solution of this embodiment may also include only two support beams of different lengths, or may include at least four support beams of different lengths.

[0045] According to a preferred embodiment, the elastic support wire mesh 20 is evenly arranged with at least ten groups of elastic support units 201 along the circumferential direction of the bearing, and the elastic support wire mesh 20 is evenly arranged with at least four groups of elastic support units 201 along the axial direction of the bearing. Not limited to this, the elastic support wire mesh 20 can also be evenly arranged with the remaining number of elastic support units 201 along the circumferential direction of the bearing, and the elastic support wire mesh 20 can also be evenly arranged with the remaining number of elastic support units 201 along the axial direction of the bearing, depending on the application environment of the radial gas foil bearing. It can be seen that the more the number of elastic support units 201 arranged on the elastic support wire mesh 20, the higher the uniformity of the stiffness distribution of the elastic support wire mesh 20.

[0046] According to a preferred embodiment, the elastic supporting wire mesh 20 is an integrated structure, and the supporting top foil 30 is an integrated structure, such as Figure 1The elastic supporting metal wire mesh 20 and the supporting top foil 30 of the preferred technical solution of this embodiment are both integrated structures, so that the overall structure of the radial gas foil bearing is simple and the reliability is high.

[0047] According to a preferred embodiment, a wire groove 101 is provided inside the bearing shell 10, and the elastic supporting wire mesh 20 and the supporting top foil 30 are located in the wire groove 101. Figures 1 to 3 Preferably, the width of the wire groove 101 in the radial direction of the bearing is greater than the sum of the thicknesses of the elastic supporting metal wire mesh 20 and the supporting top foil 30. More preferably, the width of the wire groove 101 in the radial direction of the bearing is 0.3 to 0.5 mm greater than the sum of the thicknesses of the elastic supporting metal wire mesh 20 and the supporting top foil 30.

[0048] The elastic support wire mesh 20 and the support top foil 30 of the preferred technical solution of this embodiment are located in the wire groove 101 at the same time, and the width of the wire groove 101 in the radial direction of the bearing is greater than the sum of the thicknesses of the elastic support wire mesh 20 and the support top foil 30. The two ends of the elastic support wire mesh 20 and the support top foil 30 are free ends, and self-pretensioning can be generated through the bending back tension of the elastic support wire mesh 20 and the support top foil 30, so that a pretensioning effect is generated between the elastic support wire mesh 20 and the support top foil 30, and they are closely attached to the inner wall of the bearing shell 10. The radial gas foil bearing of this structure has excellent stiffness and damping during high-speed operation, which can effectively prevent the self-excited vibration of the rotor during high-speed operation and improve the high-speed stability of the bearing.

[0049] Example 2

[0050] This embodiment describes the air compressor of the present invention in detail.

[0051] The air compressor of this embodiment includes the radial gas foil bearing of any one of the technical solutions in Example 1. The remaining structure of the air compressor of this embodiment may be the same as the prior art and will not be described in detail here. The air compressor of this embodiment includes the radial gas foil bearing of any one of the technical solutions in Example 1. Since the radial gas foil bearing has the advantages of high operating accuracy, high stability and reliability, and a wide range of operating conditions, it can improve the performance of the air compressor and expand the application field of the air compressor.

[0052] Example 3

[0053] This embodiment describes the automobile of the present invention in detail.

[0054] The automobile of this embodiment includes the air compressor of any one of the technical solutions in Example 2. The remaining structure of the automobile of this embodiment may be the same as the prior art and will not be described in detail here. The automobile of this embodiment is, for example, a hydrogen fuel vehicle. The automobile of this embodiment includes the air compressor of any one of the technical solutions in Example 2. Since the performance of the air compressor is improved, the performance of the automobile can be improved.

[0055] Example 4

[0056] This embodiment describes the aircraft of the present invention in detail.

[0057] The aircraft of this embodiment includes the air compressor of any one of the technical solutions in Embodiment 2. The remaining structure of the aircraft of this embodiment may be the same as the prior art and will not be described in detail here. The aircraft of this embodiment includes the air compressor of any one of the technical solutions in Embodiment 2. Since the performance of the air compressor is improved, the performance of the aircraft can be improved.

[0058] In the description of the present invention, it should be noted that, unless otherwise specified, "multiple" means two or more than two; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0059] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0060] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A radial gas foil bearing, characterized in that: The invention comprises a bearing shell (10), an elastic supporting metal wire mesh (20) and a supporting top foil (30), wherein the supporting top foil (30) is located inside the bearing shell (10), and the elastic supporting metal wire mesh (20) is located between the bearing shell (10) and the supporting top foil (30), wherein the elastic supporting metal wire mesh (20) is provided with a plurality of groups of elastic supporting units (201) along the circumferential direction and the axial direction of the bearing, and the elastic supporting unit (201) comprises a plurality of supporting beams of different lengths; In the circumferential direction of the bearing, the length gradient trends of the support beams of two adjacent groups of the elastic support units (201) are opposite, and in the axial direction of the bearing, the length gradient trends of the support beams of two adjacent groups of the elastic support units (201) are the same and / or opposite.

2. The radial gas foil bearing according to claim 1, characterized in that: In the circumferential direction of the bearing, the length changes of the support beams of two adjacent groups of the elastic support units (201) are respectively increasing and decreasing in sequence, and in the axial direction of the bearing, the length changes of the support beams of two adjacent groups of the elastic support units (201) are both increasing or both decreasing in sequence; or In the circumferential direction of the bearing, the length changes of the support beams of two adjacent groups of the elastic support units (201) are respectively decreasing and increasing in sequence, and in the axial direction of the bearing, the length changes of the support beams of two adjacent groups of the elastic support units (201) are respectively decreasing or increasing in sequence.

3. The radial gas foil bearing according to any one of claims 1 to 2, characterized in that: The elastic support unit (201) comprises a first support beam (2011), a second support beam (2012) and a third support beam (2013); the first support beam (2011), the second support beam (2012) and the third support beam (2013) are arranged at intervals and their lengths increase successively.

4. The radial gas foil bearing according to claim 3, characterized in that: The length difference between adjacent ones of the first support beam (2011), the second support beam (2012) and the third support beam (2013) is 1 to 3 mm.

5. The radial gas foil bearing according to claim 3, characterized in that: The first support beam (2011), the second support beam (2012) and the third support beam (2013) have the same width, and the width of the first support beam (2011), the second support beam (2012) and the third support beam (2013) is 0.8 to 1.5 mm.

6. The radial gas foil bearing according to claim 1, characterized in that: The elastic support metal wire mesh (20) is evenly arranged with at least ten groups of the elastic support units (201) along the circumferential direction of the bearing, and the elastic support metal wire mesh (20) is evenly arranged with at least four groups of the elastic support units (201) along the axial direction of the bearing.

7. The radial gas foil bearing according to claim 1, characterized in that: The elastic supporting metal wire mesh (20) is an integrated structure, and the supporting top foil (30) is an integrated structure.

8. The radial gas foil bearing according to claim 1, characterized in that: A wire groove (101) is provided inside the bearing shell (10), the elastic supporting metal wire mesh (20) and the supporting top foil (30) are located in the wire groove (101), and the width of the wire groove (101) in the radial direction of the bearing is greater than the sum of the thicknesses of the elastic supporting metal wire mesh (20) and the supporting top foil (30).

9. The radial gas foil bearing according to claim 8, characterized in that: The width of the wire groove (101) in the radial direction of the bearing is 0.3 to 0.5 mm greater than the sum of the thicknesses of the elastic supporting metal wire mesh (20) and the supporting top foil (30).

10. An air compressor, characterized in that: Comprising the radial gas foil bearing according to any one of claims 1 to 9.

11. A car, characterized in that: Comprising the air compressor as claimed in claim 10.

12. An aircraft, characterized in that: Comprising the air compressor as claimed in claim 10.

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