Thrust Air Foil Bearings

Abstract

The present invention provides a thrust air foil bearing, which relates to the technical field of air bearings, and solves the technical problems in the prior art that the thrust foil bearing will be completely scrapped after the top foil is worn out, and the bearing bearing capacity and stability are not ideal. The thrust air foil bearing includes a top foil module, a wave foil module, a pre-tightening module and a bearing seat. The pre-tightening module, the wave foil module and the top foil module can be stacked in sequence from bottom to top and detachably fixedly installed on the bearing seat through pins. The pins can limit the circumferential rotation of the top foil module, the wave foil module and the pre-tightening module; the top foil module, the wave foil module, the pre-tightening module and the bearing seat can be sleeved on the rotor in sequence, and a wedge-shaped space can be formed between the top foil module and the thrust disk of the rotor. The pre-tightening module can contact the bearing seat and provide a pre-tightening force for the thrust air foil bearing. The present invention is used to reduce production and manufacturing costs, improve the bearing bearing capacity, and increase the stability of the bearing-rotor system.

Description

Technical Field

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

[0002] Air foil bearing is a kind of dynamic pressure gas bearing. It is widely used in turbomachinery such as air compressors, air cycle machines, micro gas turbines, etc. due to its high temperature resistance, high speed, oil-free lubrication, and low friction loss. Air foil bearing uses the wedge effect. As the speed of the supporting rotor increases, the gas with a certain viscosity in the surrounding environment is dragged into the wedge-shaped air cavity formed by the rotor and the bearing support surface by the high-speed rotating rotor. When the speed of the rotor rises to a certain speed, the gas pressure in the wedge-shaped supporting air cavity increases to support the rotor.

[0003] At present, the most common and widely used is the corrugated foil type air foil bearing, which has good stiffness and damping characteristics. Usually, the corrugated foil type thrust gas foil bearing includes three layers: top foil, corrugated foil and supporting bottom plate. The top foil and corrugated foil include multi-lobed top foil and corrugated foil respectively. Each lobe of corrugated foil is fixed to the bottom plate by welding, and each lobe of top foil is also fixed to the bottom plate by welding, forming a structure in which the bottom plate supports the corrugated foil and the corrugated foil supports the top foil. During operation, the rotor and the top foil form a wedge-shaped space. After the rotor rotates, the top foil needs to overcome the starting friction torque. The rotor drags the gas with a certain viscosity in the surrounding environment into the wedge for compression. When the speed increases to a certain level, the rotor is suspended. During the operation process, the start and stop of the rotor will cause a certain degree of wear on the top foil of the bearing, so the life evaluation standard of the foil bearing is not the working time but the number of starts and stops.

[0004] The applicant has found that the prior art has at least the following technical problems:

[0005] When the top foil of the existing thrust foil bearing is worn out, the thrust foil bearing will be completely scrapped, and for the undamaged foil, such scrapping is a waste.

[0006] In addition, the load-bearing capacity and stability of existing thrust foil bearings are not ideal. Summary of the invention

[0007] The purpose of the present invention is to provide a thrust air foil bearing to solve the technical problems in the prior art that the thrust foil bearing will be completely scrapped after the top foil is worn out, and the bearing load capacity and stability are not ideal. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The thrust air foil bearing provided by the present invention comprises a top foil module, a wave foil module, a preload module and a bearing seat, wherein:

[0010] The preload module, the bump foil module and the top foil module can be stacked in sequence from bottom to top and detachably fixedly mounted on the bearing seat by pins, and the pins can limit the circumferential rotation of the top foil module, the bump foil module and the preload module;

[0011] The top foil module, the wave foil module, the pre-tightening module and the bearing seat can be sequentially sleeved on the rotor, a wedge-shaped space can be formed between the top foil module and the thrust disk of the rotor, and the pre-tightening module can abut against the bearing seat and provide a pre-tightening force for the thrust air foil bearing.

[0012] Furthermore, the top foil module includes an annular top foil bottom plate and a plurality of fan-shaped top foil pieces, the top foil pieces are evenly arranged circumferentially along the upper surface of the top foil bottom plate and form an annular structure, the upper surface of one side of the top foil piece is lower than the upper surface of the other side of the top foil piece and a wedge-shaped space can be formed between the top foil piece and the thrust plate of the rotor.

[0013] Furthermore, one side of the top foil is fixedly connected to the top foil bottom plate by welding, and the top foil module also includes a top foil gasket, which is fixed to the upper surface of the top foil bottom plate by welding, and the lower surface of the other side of the top foil abuts against the top foil gasket.

[0014] Furthermore, the bump foil module comprises an annular bump foil bottom plate and a plurality of fan-shaped bump foil pieces, the bump foil pieces are evenly distributed in the circumferential direction on the upper surface of the bump foil bottom plate, and the bump foil pieces are fixedly connected to the upper surface of the bump foil bottom plate by welding.

[0015] Furthermore, the pre-tightening module includes an annular pre-tightening layer base plate and a pre-tightening structure, the top of the pre-tightening structure is fixedly connected to the lower surface of the pre-tightening layer base plate and is evenly distributed on the circumference of the lower surface of the pre-tightening layer base plate, and the lower part of the pre-tightening structure can contact the upper surface of the bearing seat and provide a pre-tightening force for the thrust air foil bearing.

[0016] Furthermore, the pre-tightening structure includes two elastic parts, which include an arc-shaped elastic deformation part and support arms connected to both ends of the elastic deformation part. The two elastic parts are crossed in the middle of the elastic deformation part to form a cross and are fixedly connected. The support arms can contact the upper surface of the bearing seat, and the top of the pre-tightening structure and the lower surface of the pre-tightening layer bottom plate are fixedly connected by welding.

[0017] Furthermore, the pre-tightening module also includes a pre-tightening layer support foil, which is arranged between the pre-tightening layer bottom plate and the bearing seat. An accommodating hole is opened on the pre-tightening layer support foil at a position corresponding to the pre-tightening structure. The lower end of the pre-tightening structure can pass through the accommodating hole and abut against the upper surface of the bearing seat. The diameter of the accommodating hole can accommodate the elastic deformation of the pre-tightening structure.

[0018] Furthermore, the pre-tightening layer bottom plate of the pre-tightening module, the corrugated foil bottom plate of the corrugated foil module, the top foil bottom plate of the top foil module and the pre-tightening layer supporting foil are annular thin plates with the same material, same thickness, same outer diameter and same inner diameter.

[0019] Furthermore, the pre-tightening layer bottom plate, the corrugated foil bottom plate, the top foil bottom plate and the pre-tightening layer support foil are provided with a plurality of pin holes of the same number and corresponding positions in the circumferential direction, and the pins can pass through the pin holes on the top foil bottom plate, the corrugated foil bottom plate, the pre-tightening layer bottom plate and the pre-tightening layer support foil in sequence and fix them on the bearing seat.

[0020] Furthermore, openings are provided at positions corresponding to each pin hole on the periphery of the pre-tightening layer bottom plate, the corrugated foil bottom plate, the top foil bottom plate and the pre-tightening layer support foil, and each of the openings is connected to the pin hole, so that the pin can be inserted into the pin hole from the opening.

[0021] The thrust air foil bearing of the present invention has the following beneficial effects:

[0022] 1. Since the top foil module, the bump foil module and the preload module are detachably fixedly connected to the bearing seat by pins, after the top foil module is worn, the pins can be removed, and the top foil module can be replaced without replacing the bump foil module and then installed with the pins, which is conducive to reducing the production cost;

[0023] 2. The three-layer laminate of top foil module, wave foil module and preload module forms multiple series-connected support structures with different stiffness, which increases the bearing stiffness and damping characteristics and improves the bearing load capacity;

[0024] 3. The preload module increases the stability of the bearing-rotor system, which is beneficial to improving the impact resistance of the thrust air foil bearing support rotor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 It is a structural schematic diagram of the thrust air foil bearing of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the top foil module of the thrust air foil bearing of the present invention;

[0028] Figure 3 It is a structural schematic diagram of a thrust air foil bearing wave foil module of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the thrust air foil bearing preload module of the present invention;

[0030] Figure 5 It is a schematic diagram of the assembly of the thrust air foil bearing of the present invention;

[0031] In the figure, 11, top foil; 12, top foil gasket; 13, top foil bottom plate; 110, top foil welding point; 130, top foil pin hole; 21, bump foil; 22, bump foil bottom plate; 210, bump foil welding point; 220, bump foil pin hole; 31, pre-tightening layer bottom plate; 32, pre-tightening structure; 33, pre-tightening layer supporting foil; 310, pre-tightening layer pin hole; 320, pre-tightening structure welding point; 330, pre-tightening supporting foil pin hole; 331, accommodating hole; 4, bearing seat; 5, rotor; 6, thrust plate. DETAILED DESCRIPTION

[0032] 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.

[0033] like Figures 1 to 5 As shown, the present invention provides a thrust air foil bearing, comprising a top foil module, a bump foil module, a preload module and a bearing seat 4, wherein the preload module, the bump foil module and the top foil module can be stacked in sequence from bottom to top and detachably fixedly mounted on the bearing seat 4 through pins, and the pins can limit the circumferential rotation of the top foil module, the bump foil module and the preload module;

[0034] The top foil module, wave foil module, preload module and bearing seat 4 can be sequentially mounted on the rotor 5, a wedge-shaped space can be formed between the top foil module and the thrust plate 6 of the rotor 5, the preload module can contact the bearing seat 4 and provide preload force for the thrust air foil bearing.

[0035] like Figure 5As shown, a set of thrust air foil bearings is arranged on the left and right sides of the thrust disk of the rotor, and the top foil module, the wave foil module, the preload module and the bearing seat 4 are sequentially sleeved on the rotor 5;

[0036] Since the top foil module, the bump foil module and the preload module are detachably fixedly connected to the bearing seat 4 by pins, after the top foil module is worn, the pins can be removed, and the top foil module can be replaced without replacing the bump foil module and then installed with the pins, which is conducive to reducing the production cost;

[0037] The three-layer stack of top foil module, wave foil module and preload module forms multiple series-connected support structures with different stiffness, which increases the bearing stiffness and damping characteristics and improves the bearing load capacity;

[0038] The preload module increases the stability of the bearing-rotor system, which is beneficial to improving the impact resistance of the thrust air foil bearing supported rotor system.

[0039] As an optional embodiment, the top foil module includes an annular top foil bottom plate 13 and a plurality of fan-shaped top foil pieces 11, the top foil pieces 11 are evenly arranged along the circumference of the upper surface of the top foil bottom plate 13 and form an annular structure, the upper surface of one side of the top foil piece 11 is lower than the upper surface of the other side of the top foil piece 11 and a wedge-shaped space can be formed between the top foil piece 11 and the thrust plate 6 of the rotor 5.

[0040] The fan-shaped top foil 11 is evenly distributed around the annular top foil bottom plate 13 and forms an annular structure. There is a circumferential gap between adjacent top foils 11. The fan-shaped top foil 11 is composed of an outer arc, an inner arc and two side edges. The diameter of the inner arc of the fan-shaped top foil 11 is the same as the inner diameter of the top foil bottom plate 13, and the diameter of the outer arc of the top foil 11 is smaller than the outer diameter of the top foil bottom plate 13. One side edge of the top foil 11 is fixedly connected to the upper surface of the top foil bottom plate 13 by spot welding, and the position of the spot welding, i.e., the top foil welding point 110, is evenly distributed along the radial direction of the side edge. In order to form a wedge-shaped space between the upper surface of the top foil 11 and the thrust disk 6 of the rotor 5, the upper surface of one side of the top foil 11 needs to be lower than the upper surface of the other side of the top foil 11. This can be achieved by making one side thinner and the other side thicker when manufacturing the top foil 11, or by setting a gasket between the other side of the top foil 11 and the top foil bottom plate 13.

[0041] As an optional embodiment, one side of the top foil 11 is fixedly connected to the top foil bottom plate 13 by welding, and the top foil module also includes a top foil gasket 12, which is fixedly connected to the upper surface of the top foil bottom plate 13 by welding, and the lower surface of the other side of the top foil 11 abuts against the top foil gasket 12.

[0042] The thickness of the top foil gasket 12 can be customized according to actual needs in order to adjust the height of the wedge, that is, the angle between the top foil 11 and the top foil bottom plate 13, so as to maintain the wedge effect in normal operation of the bearing. The top foil gasket 12 is also fan-shaped, and the outer arc diameter and inner arc diameter of the top foil gasket 12 are the same as the outer arc diameter and inner arc diameter of the top foil 11, while the top foil gasket 12 is narrower than the top foil 11.

[0043] As an optional embodiment, the bump foil module includes an annular bump foil base plate 22 and a plurality of fan-shaped bump foil pieces 21. The bump foil pieces 21 are evenly distributed circumferentially on the upper surface of the bump foil base plate 22, and the bump foil pieces 21 are fixedly connected to the upper surface of the bump foil base plate 22 by welding.

[0044] The top foil bottom plate 13 contacts the bump foil sheet 21 of the bump foil module, and the bump foil sheet 21 of the bump foil module can undergo slight elastic deformation when receiving a vertical bearing force, thereby improving the bearing capacity of the bearing;

[0045] One side edge of the bump foil sheet 21 is fixedly connected to the upper surface of the bump foil bottom plate 22 by spot welding, and the spot welding positions, namely the bump foil welding points 210, are evenly distributed along the radial direction of the side edge.

[0046] As an optional embodiment, the pre-tightening module includes an annular pre-tightening layer base plate 31 and a pre-tightening structure 32. The top end of the pre-tightening structure 32 is fixedly connected to the lower surface of the pre-tightening layer base plate 31 and is evenly distributed on the circumference of the lower surface of the pre-tightening layer base plate 31. The lower part of the pre-tightening structure 32 can contact the upper surface of the bearing seat 4 and provide a pre-tightening force for the thrust air foil bearing.

[0047] The pre-tightening module provides pre-tightening force for the thrust foil bearing during operation to improve the stability of the system and increase the impact resistance of the bearing-rotor 5 system. The top of the pre-tightening structure 32 is fixed to the lower surface of the pre-tightening layer bottom plate 31 by welding. The pre-tightening structure 32 is an elastic member and can generate pre-tightening force in the vertical direction of the pre-tightening layer bottom plate 31.

[0048] As an optional embodiment, the pre-tensioning structure 32 includes two elastic members, which include an arc-shaped elastic deformation portion and support arms connected to both ends of the elastic deformation portion. The two elastic members are crossed in the middle of the elastic deformation portion to form a cross and are fixedly connected. The support arms can contact the upper surface of the bearing seat 4. The top end of the pre-tensioning structure 32 and the lower surface of the pre-tensioning layer bottom plate 31 are fixedly connected by welding.

[0049] The top of the pre-tightening structure 32, i.e., the intersection of the two elastic deformation parts, i.e., the pre-tightening structure welding point 320 is fixedly connected to the lower surface of the pre-tightening layer bottom plate 31 by welding;

[0050] The pre-tightening structure 32 uses two cross-shaped elastic parts, so that the pre-tightening structure 32 includes four support arms that are against the upper surface of the bearing seat 4. Of course, more cross-shaped elastic parts can also be used, such as a pre-tightening structure 32 with three elastic parts in a snowflake shape and six support arms, to provide a greater pre-tightening force.

[0051] As an optional embodiment, the pre-tightening module also includes a pre-tightening layer support foil 33, which is arranged between the pre-tightening layer bottom plate 31 and the bearing seat 4. An accommodating hole 331 is opened on the pre-tightening layer support foil 33 at a position corresponding to the pre-tightening structure 32. The lower end of the pre-tightening structure 32 can pass through the accommodating hole 331 and abut against the upper surface of the bearing seat 4. The diameter of the accommodating hole 331 can accommodate the elastic deformation of the pre-tightening structure 32.

[0052] The pre-tightening layer support foil 33 is also annular, and can be sleeved on the rotor 5 and located between the bearing seat 4 and the pre-tightening layer bottom plate 31. The pre-tightening layer support foil 33 is also provided with pre-tightening support foil pin holes at corresponding positions, just like the pre-tightening layer bottom plate 31, the wave foil bottom plate 22 and the top foil bottom plate 13. The pins can pass through the pre-tightening support foil pin holes and limit the circumferential rotation thereof.

[0053] No matter the pre-tightening structure 32 is in an elastic deformation state or a non-elastic deformation state, the accommodation hole 331 of the pre-tightening layer supporting foil 33 can accommodate the pre-tightening structure 32 therein, thereby forming a certain accommodation space for the pre-tightening structure 32 .

[0054] As an optional embodiment, the pre-tightening layer bottom plate 31 of the pre-tightening module, the bump foil bottom plate 22 of the bump foil module, the top foil bottom plate 13 of the top foil module and the pre-tightening layer supporting foil 33 are annular thin plates with the same material, same thickness, same outer diameter and same inner diameter.

[0055] If the pre-tightening layer bottom plate 31, the bump foil bottom plate 22, the top foil bottom plate 13 and the pre-tightening layer supporting foil 33 are annular thin plates of the same material, the same thickness, the same outer diameter and the same inner diameter, they can be processed uniformly during production and processing without being manufactured separately, thus saving production and processing costs; only the other components of the pre-tightening module, the bump foil module and the top foil module except the pre-tightening layer bottom plate 31, the bump foil bottom plate 22 and the top foil bottom plate 13 need to be processed separately and then assembled; and the accommodating holes 331 on the pre-tightening layer supporting foil 33 can be punched separately.

[0056] As an optional embodiment, a plurality of pin holes of the same number and corresponding positions are opened in the circumferential direction of the pre-tensioning layer bottom plate 31, the bump foil bottom plate 22, the top foil bottom plate 13 and the pre-tensioning layer support foil 33, and the pins can pass through the pin holes on the top foil bottom plate 13, the bump foil bottom plate 22, the pre-tensioning layer bottom plate 31 and the pre-tensioning layer support foil 33 in sequence and fix them on the bearing seat 4.

[0057] Similarly, a plurality of pin holes of the same number and corresponding positions are opened in the circumferential direction of the pre-tightening layer bottom plate 31, the corrugated foil bottom plate 22, the top foil bottom plate 13 and the pre-tightening layer support foil 33 of the same material, thickness, outer diameter and inner diameter. For example, the center of each pin hole is equidistant from the center of the bottom plate, that is, the center of each pin hole is on the circumference of the same circle, and the pin holes are evenly distributed along the circumference of the circle. In this way, the pin holes can be uniformly processed on the bottom plate without the need to manufacture them separately, thus saving production and processing costs.

[0058] As an optional embodiment, openings are provided at positions corresponding to each pin hole on the periphery of the top foil bottom plate 13, the corrugated foil bottom plate 22, the pre-tightening layer bottom plate 31 and the pre-tightening layer support foil 33, and each opening is connected to the pin hole, and the pin can be inserted into the pin hole from the opening.

[0059] During assembly and disassembly, each pin needs to be inserted in turn from the corresponding pin holes on the top foil bottom plate 13, the bump foil bottom plate 22, the pre-tightening layer bottom plate 31 and the pre-tightening layer support foil 33, that is, the top foil pin hole, the bump foil pin hole, the pre-tightening layer pin hole and the pre-tightening support foil pin hole, which is rather laborious. If an opening connected to the pin hole is provided at a position corresponding to each pin hole on the periphery of the top foil bottom plate 13, the bump foil bottom plate 22, the pre-tightening layer bottom plate 31 and the pre-tightening layer support foil 33, the pin only needs to be inserted radially from the top foil bottom plate 13, the bump foil bottom plate 22, the pre-tightening layer bottom plate 31 and the pre-tightening layer support foil 33 at the same time, which is convenient, time-saving and labor-saving.

[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 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.

[0061] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, 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.

[0062] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 specific circumstances.

Claims

1. A thrust air foil bearing, characterized in that: It includes a top foil module, a wave foil module, a preload module and a bearing seat, wherein: The preload module, the bump foil module and the top foil module can be stacked in sequence from bottom to top and detachably fixedly mounted on the bearing seat by pins, and the pins can limit the circumferential rotation of the top foil module, the bump foil module and the preload module; The top foil module, the wave foil module, the pre-tightening module and the bearing seat can be sequentially sleeved on the rotor, a wedge-shaped space can be formed between the top foil module and the thrust disk of the rotor, and the pre-tightening module can abut against the bearing seat and provide a pre-tightening force for the thrust air foil bearing; The pre-tightening module comprises an annular pre-tightening layer bottom plate and a pre-tightening structure, the top end of the pre-tightening structure is fixedly connected to the lower surface of the pre-tightening layer bottom plate and is evenly distributed in the circumferential direction of the lower surface of the pre-tightening layer bottom plate, and the lower part of the pre-tightening structure can abut against the upper surface of the bearing seat and provide a pre-tightening force for the thrust air foil bearing; The pre-tightening structure comprises two elastic members, each of which comprises an arc-shaped elastic deformation portion and support arms connected to both ends of the elastic deformation portion, the two elastic members are crossed in a cross at the middle of the elastic deformation portion and are fixedly connected, the support arms can abut against the upper surface of the bearing seat, and the top end of the pre-tightening structure is fixedly connected to the lower surface of the pre-tightening layer bottom plate by welding; The pre-tightening module also includes a pre-tightening layer support foil, which is arranged between the pre-tightening layer bottom plate and the bearing seat. An accommodating hole is opened on the pre-tightening layer support foil at a position corresponding to the pre-tightening structure. The lower end of the pre-tightening structure can pass through the accommodating hole and abut against the upper surface of the bearing seat. The diameter of the accommodating hole can accommodate the elastic deformation of the pre-tightening structure.

2. The thrust air foil bearing according to claim 1, characterized in that: The top foil module includes an annular top foil bottom plate and a plurality of fan-shaped top foil pieces, wherein the top foil pieces are evenly arranged circumferentially along the upper surface of the top foil bottom plate and form an annular structure, wherein the upper surface of one side of the top foil piece is lower than the upper surface of the other side of the top foil piece and a wedge-shaped space can be formed between the top foil piece and the thrust plate of the rotor.

3. The thrust air foil bearing according to claim 2, characterized in that: One side of the top foil is fixedly connected to the top foil bottom plate by welding, and the top foil module also includes a top foil gasket, which is fixed to the upper surface of the top foil bottom plate by welding, and the lower surface of the other side of the top foil abuts against the top foil gasket.

4. The thrust air foil bearing according to claim 3, characterized in that: The bump foil module comprises an annular bump foil bottom plate and a plurality of fan-shaped bump foil pieces, wherein the bump foil pieces are evenly distributed in the circumferential direction on the upper surface of the bump foil bottom plate, and the bump foil pieces are fixedly connected to the upper surface of the bump foil bottom plate by welding.

5. The thrust air foil bearing according to claim 4, characterized in that: The pre-tightening layer bottom plate of the pre-tightening module, the corrugated foil bottom plate of the corrugated foil module, the top foil bottom plate of the top foil module and the pre-tightening layer supporting foil are annular thin plates with the same material, same thickness, same outer diameter and same inner diameter.

6. The thrust air foil bearing according to claim 5, characterized in that: The pre-tightening layer bottom plate, the corrugated foil bottom plate, the top foil bottom plate and the pre-tightening layer support foil are provided with a plurality of pin holes of the same number and corresponding positions in the circumferential direction, and the pins can sequentially pass through the pin holes on the top foil bottom plate, the corrugated foil bottom plate, the pre-tightening layer bottom plate and the pre-tightening layer support foil and fix them on the bearing seat.

7. The thrust air foil bearing according to claim 6, characterized in that: The pre-tightening layer bottom plate, the corrugated foil bottom plate, the top foil bottom plate and the pre-tightening layer supporting foil are provided with openings at positions corresponding to each of the pin holes, each of the openings is connected to the pin hole, and the pin can be inserted into the pin hole from the opening.

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