Dynamic pressure gas foil bearing and rotating machine

Abstract

The invention discloses a dynamic pressure gas foil bearing and a rotating machine, and the dynamic pressure gas foil bearing comprises an elastic supporting foil which is of an annular integrated structure; the top-layer foil is arranged on one side of the elastic supporting foil, and the top-layer foil is fixedly connected with the elastic supporting foil; the elastic supporting foil is arranged on one side of the supporting bottom plate, and the top-layer foil is arranged on the side, away from the supporting bottom plate, of the elastic supporting foil; the top-layer foil is mounted on the supporting bottom plate and comprises a first end and a second end which are oppositely arranged in the circumferential direction of the dynamic pressure gas foil bearing; the first end and the second end of the top-layer foil are gradually close to the supporting bottom plate in the circumferential direction from the side close to the circumferential middle of the top-layer foil to the side close to the circumferential edge of the top-layer foil to form a wedge-shaped structure. The invention provides a dynamic pressure gas foil bearing with reverse rotation adaptive capacity and a rotary machine.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a dynamic pressure gas foil bearing and a rotating machine. Background Art

[0002] The dynamic pressure gas foil bearing uses the wedge-shaped space formed between the rotor carrier plate and the bearing surface to produce a wedge effect. As the rotor speed continues to increase, due to the viscosity of the gas, the surrounding gas is continuously dragged into the wedge-shaped space formed between the rotor bearings. As the air pressure in the wedge-shaped space continues to increase, a dynamic pressure gas film is formed when the bearing speed reaches a certain value, and the bearing enters a stable gas lubrication state. Under the dynamic pressure effect, the higher the speed, the higher the bearing capacity. By using the gas film formed by the gas to bear the load, the friction can be greatly reduced. Compared with other types of bearings, gas bearings have many advantages such as oil-free, pollution-free, low running resistance, simple structure, and low mechanical loss. Gas bearing technology makes up for many deficiencies of traditional liquid bearings, sliding bearings, and rolling bearings. It has been widely used in high-speed rotating machinery and precision processing machinery, especially in food, brewing, data room and other usage scenarios. It is highly respected. Under the requirements of energy conservation, emission reduction and the new situation of environmental protection, the application of dynamic pressure air floating bearings has great market and prospects.

[0003] While dynamic pressure gas foil bearings have their advantages during use, they also have disadvantages. It is crucial to optimize and improve the load-bearing capacity of dynamic pressure gas foil bearings and improve the situation where bearings are easily burned under reverse operation. For example, in the refrigeration centrifugal compressor and blower industry, during high-load operation, if an abnormal shutdown or an urgent need to quickly reduce the load and shut down occurs, the pressure on the high-pressure side cannot be quickly unloaded. When the compressor rotor loses its power source, the rotor is very likely to reverse under the action of the high pressure difference. In this case, the bearing is required to have a certain anti-reversal capability, but the dynamic pressure gas foil bearings currently do not have the ability to reverse.

[0004] The related art hydrodynamic gas foil bearing generally does not have anti-reverse rotation capability. In the case of rotor reversal, the hydrodynamic gas foil bearing may be damaged or even destroyed because a hydrodynamic gas film cannot be formed. Summary of the invention

[0005] The embodiments of the present invention provide a dynamic pressure gas foil bearing and a rotating machine with reverse adaptability.

[0006] To achieve the above-mentioned purpose, the present invention provides a dynamic pressure gas foil bearing, comprising: an elastic support foil, the elastic support foil is an annular integrated structure; a top foil, arranged on one side of the elastic support foil, and the top foil is fixedly connected to the elastic support foil; a supporting base plate, the elastic support foil is arranged on one side of the supporting base plate, and the top foil is arranged on a side of the elastic support foil away from the supporting base plate; the top foil is installed on the supporting base plate, and the top foil comprises a first end and a second end arranged opposite to each other along the circumference of the dynamic pressure gas foil bearing, and the first end and the second end of the top foil respectively gradually approach the supporting base plate along the circumference from a side close to the circumferential middle of the top foil to a side of the circumferential edge of the top foil to form a wedge-shaped structure.

[0007] Furthermore, the elastic supporting foil comprises a plurality of corrugated foil structures arranged at intervals, and a connecting portion is formed between two adjacent corrugated foil structures;

[0008] The elastic supporting foil is fixedly connected to the top foil through the connecting portion.

[0009] Furthermore, the top foil sheet includes a plurality of bearing plane areas, and the bearing plane areas correspond one-to-one to the bump foil structures.

[0010] Further, the top foil includes a wedge-shaped area, and the wedge-shaped area corresponds to the connecting portion one by one;

[0011] The bottom of the wedge-shaped area protrudes toward the direction of the elastic supporting foil, the bottom of the wedge-shaped area is a welding plane, and the bottom of the wedge-shaped area is welded to the connecting portion.

[0012] Furthermore, the elastic supporting foil is welded to the supporting base plate through the connecting portion, the welding point where the connecting portion is welded to the supporting base plate is a first welding point, and the welding point where the bottom of the wedge-shaped area is welded to the connecting portion is a second welding point; the first welding point and the second welding point are alternately distributed.

[0013] Further, the depth h1 of the wedge-shaped structure at the first end of the top foil is 0.05 mm ≤ h1 ≤ 0.3 mm;

[0014] The depth h2 of the wedge-shaped structure at the second end of the top foil is: 0.05 mm≤h2≤0.3 mm.

[0015] Further, the top foil includes a wedge-shaped area, and the wedge-shaped area corresponds to the connecting portion one by one;

[0016] The wedge-shaped area and the corresponding connecting portion are both provided with connecting ears, and the connecting ears are penetrated with positioning pins to fix the wedge-shaped area and the connecting portion.

[0017] Furthermore, the top foil is an integrally formed structure, and the shape structure of the elastic supporting foil matches the shape of the top foil.

[0018] According to another aspect of the present invention, there is provided a rotating machine comprising the above-mentioned dynamic pressure gas foil bearing.

[0019] The dynamic pressure gas foil bearing of the present invention has a first end and a second end of the top foil that are respectively circumferentially close to the support bottom plate from the circumferential middle side close to the top foil to the circumferential edge side of the top foil to form a wedge-shaped structure. Both circumferential ends of the top foil are set as wedge-shaped structures. When the rotor of the rotating machinery where the dynamic pressure gas foil bearing is located rotates forward, a wedge-shaped space is formed between the wedge-shaped structure at one circumferential end of the top foil and the rotor, which can form a dynamic pressure gas film to bear the force of the rotor. When reverse rotation occurs, a wedge-shaped space can also be formed between the wedge-shaped structure at the other circumferential end of the top foil and the rotor, which can also form a dynamic pressure gas film to bear the force of the rotor, so that the dynamic pressure gas foil bearing can still maintain its normal working state, and will not cause damage or even destruction of the dynamic pressure gas foil bearing due to the inability to form a dynamic pressure gas film, thereby having reverse adaptability. The elastic support foil of the dynamic pressure gas foil bearing of the present invention is integrally stamped to form an annular integrated structure. The elastic supporting foil of the annular integrated structure does not have a free end, and cooperates with the top foil and the wedge structure to ensure that the working state of the dynamic pressure gas foil bearing is exactly the same when rotating in both directions, so that the dynamic pressure gas foil bearing of the present invention has the ability to operate in the reverse direction. The dynamic pressure gas foil bearing structure of the present invention can ensure that the working state of the dynamic pressure gas thrust bearing is exactly the same when rotating in the forward and reverse directions when the compressor stops abnormally under extreme working conditions. Even if a reversal occurs under extreme operating conditions, the thrust bearing can still maintain its normal working state. The dynamic pressure gas foil bearing can still maintain its normal working form, and will not be damaged or even destroyed due to the inability to form a dynamic pressure gas film, thereby having the ability to adapt to reversal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a dynamic pressure gas foil bearing according to a first embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the internal structure of the dynamic pressure gas foil bearing according to the first embodiment of the present invention;

[0022] Figure 3 1 is a schematic structural diagram of a top foil of a dynamic pressure gas foil bearing according to a first embodiment of the present invention;

[0023] Figure 4 is a schematic front view of a dynamic pressure gas foil bearing according to a first embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the structure of the elastic supporting foil of the dynamic pressure gas foil bearing according to the first embodiment of the present invention;

[0025] Figure 6 is a schematic structural diagram of a dynamic pressure gas foil bearing according to a second embodiment of the present invention;

[0026] Figure 7 It is a schematic structural diagram of the elastic supporting foil of the dynamic pressure gas foil bearing according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0028] Embodiment 1

[0029] See also Figures 1 to 5 As shown, according to the first embodiment of the present invention, a dynamic pressure gas foil bearing is provided, the dynamic pressure gas foil bearing comprises an elastic support foil 10, a top foil 20 and a support base plate 30, the elastic support foil 10 is an annular integrated structure; the top foil 20 is arranged on one side of the elastic support foil 10, and the top foil 20 is fixedly connected to the elastic support foil 10; the elastic support foil 10 is arranged on one side of the support base plate 30, and the top foil 20 is arranged on the side of the elastic support foil 10 away from the support base plate 30; the top foil 20 is installed on the support base plate 30, the top foil 20 comprises a first end 20A and a second end 20B which are arranged oppositely along the circumferential direction of the dynamic pressure gas foil bearing, the first end 20A and the second end 20B of the top foil 20 are respectively along the circumferential direction from the side close to the circumferential middle part of the top foil 20 to the side of the circumferential edge of the top foil 20 gradually approaching the support base plate 30 to form a wedge structure.

[0030] The dynamic pressure gas foil bearing of the present invention has a first end 20A and a second end 20B of the top foil that are respectively circumferentially close to the support bottom plate from the circumferential middle side close to the top foil to the circumferential edge side of the top foil to form a wedge-shaped structure. Both circumferential ends of the top foil are set as wedge-shaped structures. When the rotor of the rotating machinery where the dynamic pressure gas foil bearing is located rotates forward, a wedge-shaped space is formed between the wedge-shaped structure at one circumferential end of the top foil 20 and the rotor, which can form a dynamic pressure gas film to bear the force of the rotor. When reverse rotation occurs, a wedge-shaped space can also be formed between the wedge-shaped structure at the other circumferential end of the top foil 20 and the rotor, which can also form a dynamic pressure gas film to bear the force of the rotor, so that the dynamic pressure gas foil bearing can still maintain its normal working state, and will not cause damage or even destruction of the dynamic pressure gas foil bearing due to the inability to form a dynamic pressure gas film, thereby having reverse adaptability. The elastic support foil of the dynamic pressure gas foil bearing of the present invention is integrally stamped to form an annular integrated structure. The elastic supporting foil of the annular integrated structure does not have a free end, and cooperates with the top foil and the wedge structure to ensure that the working state of the dynamic pressure gas foil bearing is exactly the same when rotating in both directions, so that the dynamic pressure gas foil bearing of the present invention has the ability to operate in the reverse direction. The dynamic pressure gas foil bearing structure of the present invention can ensure that the working state of the dynamic pressure gas thrust bearing is exactly the same when rotating in the forward and reverse directions when the compressor stops abnormally under extreme working conditions. Even if a reversal occurs under extreme operating conditions, the thrust bearing can still maintain its normal working state. The dynamic pressure gas foil bearing can still maintain its normal working form, and will not be damaged or even destroyed due to the inability to form a dynamic pressure gas film, thereby having the ability to adapt to reversal.

[0031] Preferably, see Figure 4 and Figure 5 The elastic supporting foil 10 includes a plurality of corrugated foil structures 11 arranged at intervals, and a connecting portion 12 is formed between two adjacent corrugated foil structures 11;

[0032] The elastic supporting foil 10 is fixedly connected to the top foil 20 via the connecting portion 12 .

[0033] Multiple wave foil structures are arranged at intervals to meet the basic function of elastically supporting the foil and meet the support requirements of the dynamic pressure gas foil bearing on the rotor in the rotating machinery. The connecting part is used to connect the top foil, which does not affect the function of the wave foil structure and better meets the support requirements of the dynamic pressure gas foil bearing on the rotor in the rotating machinery.

[0034] In the present invention, the elastic support foil is integrally stamped and then laser cut. The specific structure is as follows: Figure 5There are 6 evenly distributed groups of corrugated foil structures 11 in the elastic support foil 10, and each group of corrugated foil structures is composed of 7 elastic support corrugated foils. The specific number may vary depending on the size and load-bearing characteristics. In most cases, the number of corrugated foil structures is preferably between 6 and 12, and the number of elastic support corrugated foils in each group of corrugated foil structures is preferably between 6 and 15. The corrugated foil structure can adopt a variable height corrugated foil group or a uniform height corrugated foil group, which varies depending on the size and load-bearing characteristics requirements.

[0035] Preferably, see Figure 3 The top foil 20 includes a plurality of bearing plane areas 21 , and the bearing plane areas 21 correspond one-to-one to the bump foil structures 11 .

[0036] In the present invention, the top foil is welded above the elastic supporting foil, and the bearing plane area is directly above the corrugated foil structure. Such a structure can ensure the functional stability of the corrugated foil structure.

[0037] In this embodiment, the top foil 20 includes a wedge-shaped area 22, and the wedge-shaped area 22 corresponds to the connecting portion 12 one by one;

[0038] The bottom of the wedge-shaped area 22 protrudes toward the elastic supporting foil 10 , and the bottom of the wedge-shaped area 22 is a welding plane. The bottom of the wedge-shaped area 22 is welded to the connecting portion 12 .

[0039] See also Figure 1 and Figure 3 The wedge-shaped area 22 is a groove-shaped structure protruding toward the elastic support foil. The wedge-shaped area 22 is a key area for the formation of the bearing gas film, and the bearing needs a wedge-shaped area to carry loads. In addition, the bottom of the wedge-shaped area 22 is a welding plane, which is used for welding with the elastic support foil. The structure does not affect the wave foil structure, and the welding fixation effect is better, making the overall stability of the dynamic pressure gas foil bearing stronger.

[0040] Combination Figure 1 and Figure 4 As shown, the elastic support foil 10 and the support base plate 30 are welded through the connecting portion 12, the welding point where the connecting portion 12 and the support base plate 30 are welded is a first welding point C1, and the welding point where the bottom of the wedge-shaped area 22 and the connecting portion 12 are welded is a second welding point C2; the first welding point C1 and the second welding point C2 are alternately distributed.

[0041] The elastic support foil 10 can be fixed on the support base plate by a laser welder, and the welding points are located on the connection part 12. The number of welding points in each group can be between 5 and 10. The welding process should ensure that the elastic support foil and the surface of the support base plate are closely attached. The first welding points C1 and the second welding points C2 are staggered, which effectively ensures the welding stability between the various components and improves the reliability of the bearing.

[0042] In this embodiment, the depth h1 of the wedge-shaped structure at the first end 20A of the top foil 20 is 0.05 mm ≤ h1 ≤ 0.3 mm;

[0043] The depth h2 of the wedge-shaped structure of the second end 20B of the top foil 20 is 0.05 mm ≤ h2 ≤ 0.3 mm.

[0044] The entrance wedge height in the present invention is a very important performance indicator, that is, the depth value of the wedge structure. In the present invention, the entrance wedge height is controlled by controlling the height of the wave foil structure. The depth of the wedge structure h1=h2, h1 and h2 should be controlled between 0.05-0.3mm, which can balance many performances and optimize the bearing reliability and load-bearing capacity. If it is too small, the bearing load will be improved to a certain extent, but it needs to compromise on production efficiency and quality cost control. If the height difference is too large, the bearing load will drop sharply, affecting the bearing reliability.

[0045] Preferably, the top foil 20 is an integrally formed structure, and the shape structure of the elastic supporting foil 10 matches the shape of the top foil 20 .

[0046] The top foil 20 also adopts an integrated structure. The integrally formed structure cooperates with the elastic supporting foil to ensure that the working state of the dynamic pressure gas foil bearing is exactly the same when rotating in both directions, so that the dynamic pressure gas foil bearing has the ability to operate in the reverse direction.

[0047] Embodiment 2

[0048] See also Figure 6 to Figure 7As shown, according to the second embodiment of the present invention, a dynamic pressure gas foil bearing is provided, the dynamic pressure gas foil bearing comprises an elastic support foil 10, a top foil 20 and a support base plate (not shown in the figure, the support base plate may be a structure formed on the surface of other parts), the elastic support foil 10 is an annular integrated structure; the top foil 20 is arranged on one side of the elastic support foil 10, and the top foil 20 is fixedly connected to the elastic support foil 10; the elastic support foil 10 is arranged on one side of the support base plate, and the top foil 20 is arranged on the side of the elastic support foil 10 away from the support base plate; the top foil 20 is installed on the support base plate, the top foil 20 comprises a first end 20A and a second end 20B which are arranged oppositely along the circumferential direction of the dynamic pressure gas foil bearing, and the first end 20A and the second end 20B of the top foil 20 are respectively gradually approaching the support base plate along the circumferential direction from a side close to the circumferential middle part of the top foil 20 to a side of the circumferential edge of the top foil 20 to form a wedge-shaped structure.

[0049] The dynamic pressure gas foil bearing of the present invention has a first end 20A and a second end 20B of the top foil that are respectively circumferentially close to the support bottom plate from the circumferential middle side close to the top foil to the circumferential edge side of the top foil to form a wedge-shaped structure. Both circumferential ends of the top foil are set as wedge-shaped structures. When the rotor of the rotating machinery where the dynamic pressure gas foil bearing is located rotates forward, a wedge-shaped space is formed between the wedge-shaped structure at one circumferential end of the top foil 20 and the rotor, which can form a dynamic pressure gas film to bear the force of the rotor. When reverse rotation occurs, a wedge-shaped space can also be formed between the wedge-shaped structure at the other circumferential end of the top foil 20 and the rotor, which can also form a dynamic pressure gas film to bear the force of the rotor, so that the dynamic pressure gas foil bearing can still maintain its normal working state, and will not cause damage or even destruction of the dynamic pressure gas foil bearing due to the inability to form a dynamic pressure gas film, thereby having reverse adaptability. The elastic support foil of the dynamic pressure gas foil bearing of the present invention is integrally stamped to form an annular integrated structure. The elastic supporting foil of the annular integrated structure does not have a free end, so that the working state of the dynamic pressure gas foil bearing is exactly the same when it rotates in both directions, so that the dynamic pressure gas foil bearing of the present invention has the ability to operate in the reverse direction. The dynamic pressure gas foil bearing structure of the present invention can ensure that the working state of the dynamic pressure gas thrust bearing is exactly the same when it rotates forward and reverse when the compressor stops abnormally under extreme working conditions. Even if a reversal occurs under extreme operating conditions, the thrust bearing can still maintain its normal working state. The dynamic pressure gas foil bearing can still maintain its normal working form, and the problem of damage or even destruction of the dynamic pressure gas foil bearing due to the inability to form a dynamic pressure gas film will not occur, so it has the ability to adapt to reversal.

[0050] The elastic supporting foil 10 comprises a plurality of corrugated foil structures 11 arranged at intervals, and a connecting portion 12 is formed between two adjacent corrugated foil structures 11;

[0051] The elastic supporting foil 10 is fixedly connected to the top foil 20 via the connecting portion 12 .

[0052] The top foil 20 includes a wedge-shaped area 22, and the wedge-shaped area 22 corresponds to the connecting portion 12 one by one;

[0053] The wedge-shaped region 22 and the corresponding connecting portion 12 are both provided with connecting ears 40 , and the connecting ears 40 are penetrated with positioning pins to fix the wedge-shaped region 22 and the connecting portion 12 .

[0054] The dynamic pressure gas foil bearing of this embodiment needs to be installed and fixed on other parts. The dynamic pressure gas foil bearing needs to be fixed to the surface of other parts. The fixed surface not only plays a fixing role but also serves as a supporting base plate (that is, the fixed surface of other parts forms a supporting base plate). During the working process, the elastic support foil is directly pressed against the installation component (other parts), and the elastic support foil and the top foil are connected through the corresponding upper and lower connecting ears through the positioning pins. This technical solution has higher adaptability and low installation precision requirements.

[0055] Embodiment 3

[0056] According to a third embodiment of the present invention, a rotating machine is provided, and the rotating machine includes the above-mentioned dynamic pressure gas foil bearing.

[0057] The rotary machine is, for example, a centrifugal compressor, a blower, etc. The dynamic pressure gas foil bearing included in the rotary machine may be, for example, a dynamic pressure gas foil thrust bearing, a dynamic pressure gas foil radial bearing, or a dynamic pressure gas foil thrust bearing. It may also include a dynamic pressure gas foil thrust bearing, a dynamic pressure gas foil thrust bearing, and a dynamic pressure gas foil radial bearing.

[0058] The rotating machinery of the embodiment of the present application has the advantages of the dynamic pressure gas foil bearing of the embodiment of the present application.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0060] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0061] Of course, the above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the basic principles of the present invention, and these improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A dynamic pressure gas foil bearing, characterized in that: include: An elastic supporting foil (10), wherein the elastic supporting foil (10) is an annular integrated structure; A top foil (20) is arranged on one side of the elastic support foil (10), and the top foil (20) is fixedly connected to the elastic support foil (10); A supporting base plate (30), wherein the elastic supporting foil (10) is arranged on one side of the supporting base plate (30), and the top foil (20) is arranged on a side of the elastic supporting foil (10) away from the supporting base plate (30); the top foil (20) is installed on the supporting base plate (30), and the top foil (20) comprises a first end (20A) and a second end (20B) which are arranged opposite to each other along the circumference of the dynamic pressure gas foil bearing, and the first end (20A) and the second end (20B) of the top foil (20) are respectively gradually approaching the supporting base plate (30) along the circumference from a side close to the circumferential middle of the top foil (20) to a side close to the circumferential edge of the top foil (20) to form a wedge-shaped structure.

2. The dynamic pressure gas foil bearing according to claim 1, characterized in that: The elastic supporting foil (10) comprises a plurality of corrugated foil structures (11) arranged at intervals, and a connecting portion (12) is formed between two adjacent corrugated foil structures (11); The elastic supporting foil (10) is fixedly connected to the top foil (20) via the connecting portion (12).

3. The dynamic pressure gas foil bearing according to claim 2, characterized in that: The top foil (20) comprises a plurality of bearing plane areas (21), and the bearing plane areas (21) correspond one to one with the bump foil structures (11).

4. The dynamic pressure gas foil bearing according to claim 2, characterized in that: The top foil (20) comprises a wedge-shaped area (22), and the wedge-shaped area (22) corresponds one-to-one with the connecting portion (12); The bottom of the wedge-shaped area (22) protrudes toward the direction of the elastic supporting foil (10), the bottom of the wedge-shaped area (22) is a welding plane, and the bottom of the wedge-shaped area (22) is welded to the connecting portion (12).

5. The dynamic pressure gas foil bearing according to claim 4, characterized in that: The elastic supporting foil (10) and the supporting base plate (30) are welded via the connecting portion (12); the welding point where the connecting portion (12) and the supporting base plate (30) are welded is a first welding point (C1); the welding point where the bottom of the wedge-shaped area (22) and the connecting portion (12) are welded is a second welding point (C2); the first welding point (C1) and the second welding point (C2) are distributed alternately.

6. The hydrodynamic gas foil bearing according to claim 1, characterized in that: The depth h1 of the wedge-shaped structure at the first end (20A) of the top foil (20) is 0.05 mm ≤ h1 ≤ 0.3 mm; The depth h2 of the wedge-shaped structure at the second end (20B) of the top foil (20) is: 0.05 mm ≤ h2 ≤ 0.3 mm.

7. The dynamic pressure gas foil bearing according to claim 2, characterized in that: The top foil (20) comprises a wedge-shaped area (22), and the wedge-shaped area (22) corresponds one-to-one with the connecting portion (12); The wedge-shaped region (22) and the corresponding connecting portion (12) are both provided with connecting ears (40), and the connecting ears (40) are provided with positioning pins to fixedly connect the wedge-shaped region (22) and the connecting portion (12).

8. The dynamic pressure gas foil bearing according to claim 1, characterized in that: The top foil (20) is an integrally formed structure, and the shape structure of the elastic supporting foil (10) matches the shape of the top foil (20).

9. A rotating machine, characterized in that: A hydrodynamic gas foil bearing comprising the one of claims 1 to 8.

Images