Dynamic and static pressure mixed radial foil bearing with high bearing capacity

Abstract

The invention relates to a dynamic and static pressure mixed radial foil bearing with high bearing capacity, and belongs to the technical field of dynamic and static pressure mixed radial foil bearings. The structure comprises an external high-pressure air source assembly, a bearing seat, a shaft sleeve and a plurality of bump foil assemblies, at least two check blocks are arranged outside the shaft sleeve in the circumferential direction, a limiting groove is formed in the inner wall of the bearing seat, and the check blocks are arranged in the limiting groove in a sleeved mode. In the circumferential direction, the bump foil assemblies are arranged between the check blocks at intervals. A first ventilation hole is formed in the position, corresponding to the check block, of the shaft sleeve, the external high-pressure air source assembly comprises an external air source and a plurality of air inlet connectors, the external air source is communicated with the air inlet connectors, the air inlet connectors penetrate through the limiting groove and the check block, and the air outlet ends of the air inlet connectors are communicated with the first ventilation hole. According to the hybrid radial foil bearing provided by the invention, the external air source is introduced to provide static pressure support, and the bearing capacity of the hybrid radial foil bearing is improved by optimizing the bump foil assembly.

Description

Technical Field

[0001] This invention relates to a high-load-bearing dynamic-static hybrid radial foil bearing, belonging to the technical field of dynamic-static hybrid radial foil bearings. Background Technology

[0002] Foil bearings are sliding bearings that utilize gas as a lubricant, typically air. Based on the principle of load-carrying capacity generation, foil gas bearings can be classified into hydrodynamic foil bearings, hydrostatic foil bearings, and hybrid hydrodynamic-hydrostatic radial foil bearings. Hydrodynamic foil bearings do not require external gas supply; the shaft is suspended by the hydrodynamic effect generated during high-speed rotation. However, hydrodynamic foil bearings have poor stability at high speeds and limited load-carrying capacity, restricting their wider application. Hydrostatic foil bearings use external gas supply, delivering high-pressure gas between the top foil and the shaft to create a gas film, suspending the shaft. However, hydrostatic foil bearings have low load-carrying capacity and consume a large amount of hydrostatic gas.

[0003] By combining dynamic pressure foil gas bearings with static pressure foil gas bearings to form a hybrid dynamic and static pressure radial foil bearing, the problem of low load-bearing capacity of dynamic pressure gas bearings can be effectively compensated.

[0004] Meanwhile, in radial foil gas bearings employing a single-layer corrugated foil structure, the corrugated foil structure is prone to deformation under the pressure of the gas film, resulting in relatively low load-bearing capacity.

[0005] Therefore, there is an urgent need for a high-load-bearing dynamic-static hybrid radial foil bearing to improve the load-bearing capacity of radial foil bearings. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a high-load-bearing hybrid dynamic and static pressure radial foil bearing, which combines the advantages of dynamic and static pressure foil bearings. During low-speed operation or start-stop phases, an external air source provides static pressure support to prevent wear between the shaft and the bearing. During high-speed operation, the dynamic pressure effect is enhanced, and the synergistic effect of both improves the load-bearing capacity across the entire operating range.

[0007] The technical solution of this invention is as follows: A high-load-bearing dynamic-static hybrid radial foil bearing includes an external high-pressure air source assembly, a bearing housing, a bushing, and several corrugated foil assemblies, with the bushing, corrugated foil assemblies, and bearing housing arranged sequentially from the inside to the outside. At least two stops are provided on the outer side of the bushing along the circumferential direction, and a limiting groove is provided on the inner wall of the bearing housing, with the stops fitted inside the limiting groove; in the circumferential direction, corrugated foil assemblies are spaced apart between the stops; a first ventilation hole is provided at the position of the bushing corresponding to the stop. The external high-pressure air source assembly includes an external air source and several air inlet connectors. The external air source is connected to the air inlet connectors. The air inlet connectors pass through the limiting groove and the stop block, and the air outlet of the air inlet connectors is connected to the first ventilation hole.

[0008] The hydrostatic hybrid radial foil bearing provided in this application combines the advantages of hydrostatic foil bearings and hydrostatic foil bearings. During low speed or start-stop phases, an external air source provides hydrostatic support to avoid wear between the shaft and the bearing. During high-speed operation, the hydrostatic effect is enhanced, and the two work together to improve the load-bearing capacity throughout the entire operating range.

[0009] In this invention, the corrugated foil assembly adopts a split design. In the circumferential direction, a stop block is used to limit the corrugated foil assembly. In the radial direction, the corrugated foil assembly is set between the bushing and the bearing seat. When the bushing moves in the circumferential direction, it does not affect the corrugated foil assembly's load-bearing function.

[0010] According to a preferred embodiment of the present invention, the external high-pressure gas source assembly further includes a first adapter, a second adapter, and a gas supply pipe. The second adapter is connected to the gas inlet connector, the first connector of the first adapter is connected to the gas inlet connector, and the second and third connectors of the first adapter are respectively connected to the gas supply pipe, thereby enabling all first adapters on the same circumference to be connected. The first adapter also includes a fourth connector, which is connected to the second adapter on another circumference via the gas supply pipe. One of the first adapters is also provided with a fifth connector connected to the external gas source.

[0011] According to a preferred embodiment of the present invention, the width of the stop is smaller than the width of the limiting groove. This provides clearance for the movement of the bushing in the circumferential direction.

[0012] According to a preferred embodiment of the present invention, a second ventilation hole is provided on each stop block, a third ventilation hole is provided at the bottom of each limiting groove, and an air inlet connector passes through the third ventilation hole and the second ventilation hole. The positions of the third ventilation hole, the second ventilation hole and the first ventilation hole are corresponding and arranged in a group.

[0013] According to a preferred embodiment of the present invention, the diameter of the third ventilation hole is larger than the diameter of the second ventilation hole, and the diameter of the second ventilation hole is larger than the diameter of the first ventilation hole.

[0014] According to a preferred embodiment of the present invention, the upper end of the air intake connector penetrates through the third ventilation hole, and the outer diameter of the upper end of the air intake connector is smaller than the outer diameter of the third ventilation hole; the lower end of the air intake connector is threadedly connected to the inner wall of the second ventilation hole.

[0015] According to a preferred embodiment of the present invention, the corrugated foil assembly includes a bottom foil, single corrugated foils, and flat foils. The inner side of the bottom foil is provided with one or more single corrugated foils along the axial direction, and one end of the single corrugated foil is a fixed end, while the other end of the single corrugated foil is a free end. In the circumferential direction, two flat foils are provided on the top of each single corrugated foil.

[0016] According to a preferred embodiment of the present invention, the single-wave foil includes a plurality of three-level elastic units arranged along the circumferential direction. Each three-level elastic unit includes a first arc, a second arc, and a third arc connected in sequence, with the height of the first arc greater than the height of the second arc, and the height of the second arc greater than the height of the third arc. The design of two flat foils not only facilitates heat dissipation of the wave foil assembly, but also, in conjunction with the three-level elastic units on the single-wave foil, ensures the stability of the air film and enhances the load-bearing capacity of the wave foil assembly.

[0017] According to a preferred embodiment of the present invention, a connecting groove is formed on the bottom surface of the block, and the connecting groove is connected to an adjacent second ventilation hole, thereby diverting a portion of the external high-pressure air source into the connecting groove. A first heat dissipation groove is also provided on one side of the connecting groove. And / or, the bottom surface of the block is also provided with a second heat dissipation groove, and the second heat dissipation groove is connected to the second ventilation hole.

[0018] According to a preferred embodiment of the present invention, the air outlets of the first heat dissipation groove / second heat dissipation groove face the fixed end of the single corrugated foil. The first heat dissipation groove and the second heat dissipation groove are used to dissipate heat from the corrugated foil assembly.

[0019] According to a preferred embodiment of the present invention, a rear end cover is provided at one end of the bearing housing, the rear end cover being fixed to the bearing housing by bolts, and a retaining ring is provided at the other end of the bearing housing for limiting the corrugated foil assembly in the axial direction.

[0020] The beneficial effects of this invention are as follows: 1. The present invention provides clearance for the circumferential movement of the bushing by matching the size of the stop block and the limiting groove, and matching the air inlet connector with the second and third ventilation holes, while also ensuring the normal functioning of the corrugated foil assembly.

[0021] 2. The third ventilation hole on the limiting groove, the second ventilation hole on the stop block, and the first ventilation hole on the bushing form an air intake channel, eliminating the interference of traditional ventilation pipes on the corrugated foil movement and facilitating the stable operation of the corrugated foil assembly. High-pressure air enters the gap between the rotating shaft and the hydrostatic / dynamic pressure mixed radial foil bearing through the air intake channel. When the shaft speed is low, the static pressure gas forms an air film, reducing frictional power consumption and enhancing the load-bearing capacity of the hydrostatic / dynamic pressure mixed radial foil bearing. When the shaft speed increases to a certain value, the hydrostatic / dynamic pressure mixed radial foil bearing generates dynamic pressure on top of the static pressure. The synergistic effect of the dynamic and static pressures gives the hydrostatic / dynamic pressure mixed radial foil bearing a greater load-bearing capacity.

[0022] 3. This invention provides a practical and feasible air supply scheme for a hybrid dynamic and static pressure radial foil bearing, facilitating a stable supply of external air and ensuring convenient installation and maintenance. This scheme ensures balanced air pressure in the circumferential direction, providing uniform support. Simultaneously, it simplifies external air source access, requiring only a single main inlet to supply air to multiple points.

[0023] 4. In the corrugated foil assembly provided by the present invention, a three-level elastic unit is set in a single corrugated foil, and two flat foils are set on a single corrugated foil, which can not only provide gradient bearing capacity, but also maintain good heat dissipation effect.

[0024] 5. By opening a connecting groove, a first heat dissipation groove, and a second heat dissipation groove inside the baffle, a small portion of the external high-pressure gas can be diverted into the installation space of the corrugated foil assembly, thereby improving the heat dissipation effect of the corrugated foil assembly. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a hybrid dynamic and static pressure radial foil bearing provided in an embodiment of the present invention.

[0026] Figure 2 This is a view of a hybrid radial foil bearing with the rear end cover removed, provided in an embodiment of the present invention.

[0027] Figure 3 for Figure 2 A schematic diagram of the cross-section along the AA direction.

[0028] Figure 4 This is a schematic diagram of the bearing housing provided in an embodiment of the present invention.

[0029] Figure 5 This is an exploded view of the bushing provided in an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of the structure of the bottom surface of the bushing provided in an embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram of the structure of a corrugated foil assembly provided by the present invention.

[0032] 1. Bearing housing, 2. Bushing, 3. Corrugated foil assembly, 4. Stop block, 5. Limiting groove, 6. Third ventilation hole, 7. Second ventilation hole, 8. First ventilation hole, 9. Bottom foil, 10. Three-stage elastic unit, 11. Flat foil, 12. First arc, 13. Second arc, 14. Third arc, 15. Air supply pipe, 16. First adapter, 17. Air inlet connector, 18. Rear end cover, 19. Retaining ring, 20. Connecting groove, 21. Second heat dissipation groove, 22. First heat dissipation groove, 23. Second adapter. Detailed Implementation

[0033] The following illustrations will disclose several embodiments of this application, providing a clear and complete description of the technical solution of the present invention, which constitutes a part of this application. The accompanying drawings are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that, unless otherwise defined, the directions such as up, down, left, and right mentioned in this document refer to the embodiments of this application. Figure 2 The directions shown are up, down, left, and right. If the specific posture changes, the directional indication will also change accordingly. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Furthermore, in the various embodiments of this disclosure, the same or similar reference numerals denote the same or similar components.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can refer to a fixed connection, a detachable connection, or an integral part, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0037] This invention provides a high-load-bearing, hydrostatic hybrid radial foil bearing, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the assembly includes an external high-pressure air source component, a bearing housing 1, a bushing 2, and several corrugated foil components 3, arranged sequentially from the inside out. At least two stops 4 are provided on the outer side of the bushing 2 along the circumferential direction. A limiting groove 5 is provided on the inner wall of the bearing housing 1, and the stops 4 are fitted inside the limiting groove 5. Corrugated foil components 3 are spaced apart between the stops 4 in the circumferential direction. An example is illustrated with four stops 4 arranged in the circumferential direction, as shown in the accompanying drawings. A first ventilation hole 8 is provided at the position corresponding to the stops 4 on the bushing 2. The external high-pressure air source component includes an external air source and several air inlet connectors 17. The external air source is connected to the air inlet connectors 17, which pass through the limiting grooves 5 and the stops 4, and the outlet end of the air inlet connectors 17 is connected to the first ventilation hole 8. This introduces static pressure between the bushing 2 and the rotating shaft. There is no fixed connection between the corrugated foil components 3 and the bearing housing and bushing.

[0038] The hydrostatic hybrid radial foil bearing provided by this invention combines the advantages of hydrostatic foil bearings and static foil bearings. During low speed or start-stop phases, an external air source provides static pressure support to avoid wear between the shaft and the bearing. During high-speed operation, the hydrostatic effect is enhanced, and the two work together to improve the load-bearing capacity throughout the entire operating range.

[0039] In this invention, the corrugated foil assembly 3 adopts a split design. In the circumferential direction, a stop block 4 is used to limit the corrugated foil assembly 3. In the radial direction, the corrugated foil assembly 3 is set between the bushing 2 and the bearing seat 1. When the bushing 2 moves in the circumferential direction, it does not affect the corrugated foil assembly 3's role in bearing the air film, and at the same time, it can ensure the normal supply of external air source.

[0040] According to exemplary embodiments of this disclosure, such as Figure 1 , Figure 2 and Figure 3 As shown, the external high-pressure gas source assembly also includes a first adapter 16, a second adapter 23, and a gas supply pipe 15. The second adapter 23 is connected to the air inlet connector 17. The first connector of the first adapter 16 is connected to the air inlet connector 17. The second and third connectors of the first adapter 16 are respectively connected to the gas supply pipe 15, so that all the first adapters 16 on the same circumference are connected. The first adapter 16 also includes a fourth connector, which is connected to the second adapter 23 on another circumference through the gas supply pipe 15. One of the first adapters 16 is also provided with a fifth connector, which is connected to the external gas source.

[0041] This invention provides a practical and feasible air supply scheme for a hybrid hydrostatic radial foil bearing, facilitating a stable supply of external air and ensuring convenient installation and maintenance. This scheme ensures balanced air pressure in the circumferential direction, providing uniform support. Furthermore, it simplifies external air source access, requiring only a single main inlet to supply air to multiple points.

[0042] According to exemplary embodiments of this disclosure, such as Figure 2 As shown, the width of the stop 4 is smaller than the width of the limiting groove 5. This provides clearance for the movement of the bushing 2 in the circumferential direction.

[0043] According to exemplary embodiments of this disclosure, such as Figure 3 and Figure 4 As shown, each block 4 is provided with a second ventilation hole 7, and the bottom of each limiting groove 5 is provided with a third ventilation hole 6. The air inlet connector 17 passes through the third ventilation hole 6 and the second ventilation hole 7. The positions of the third ventilation hole 6, the second ventilation hole 7 and the first ventilation hole 8 are corresponding and arranged in a group.

[0044] According to exemplary embodiments of this disclosure, such as Figure 3 As shown, the diameter of the third ventilation hole 6 is larger than the diameter of the second ventilation hole 7, and the diameter of the second ventilation hole 7 is larger than the diameter of the first ventilation hole 8.

[0045] According to exemplary embodiments of this disclosure, such as Figure 3 As shown, the upper end of the air inlet connector 17 penetrates the third ventilation hole 6, and the outer diameter of the upper end of the air inlet connector 17 is smaller than the outer diameter of the third ventilation hole 6; the air inlet connector 17 and the third ventilation hole 6 are not in contact. The end of the air inlet connector 17 is threadedly connected to the inner wall of the second ventilation hole 7. The advantage of this design is that it allows for a clearance at the upper end of the air inlet connector 17, enabling the air inlet connector 17 to move synchronously with the bushing 2, while ensuring unobstructed airflow. The end of the air inlet connector 17 is threadedly connected to the second ventilation hole 7, but its upper end is in a free state of non-contact within the larger diameter third ventilation hole 6. This design allows the air inlet connector 17 to move synchronously with the slight circumferential movement of the bushing, while maintaining unobstructed airflow, preventing wear, leakage, or obstruction of the bushing's adaptive adjustment due to relative movement, and also avoiding any impact on the structure of the corrugated foil assembly.

[0046] According to exemplary embodiments of this disclosure, such as Figure 7 As shown, the corrugated foil assembly 3 includes a bottom foil 9, a single corrugated foil, and a flat foil 11. The inner side of the bottom foil 9 is provided with one or more single corrugated foils along the axial direction, and one end of the single corrugated foil is a fixed end, while the other end of the single corrugated foil is a free end. In the circumferential direction, two flat foils 11 are provided on the top of each single corrugated foil.

[0047] According to exemplary embodiments of this disclosure, such as Figure 7As shown, the single-wave foil includes several three-level elastic units 10 arranged along the circumferential direction. Each three-level elastic unit 10 includes a first arc 12, a second arc 13, and a third arc 14 connected in sequence, with the height of the first arc 12 greater than the height of the second arc 13, and the height of the second arc 13 greater than the height of the third arc 14. The three-level elastic units 10 provide excellent radial stiffness and damping characteristics, effectively adapting to load changes and absorbing vibrations. The design of two flat foils 11 at the top not only facilitates heat dissipation of the foil assembly 3, but also increases the bearing surface area. Working in synergy with the three-level elastic units 10 on the single-wave foil, they ensure the stability of the air film and enhance the bearing capacity of the foil assembly 3.

[0048] According to exemplary embodiments of this disclosure, such as Figure 6 As shown, a connecting groove 20 is opened on the bottom surface of the block 4, and the connecting groove 20 connects to the adjacent second ventilation hole 7, thereby diverting a portion of the external high-pressure air source into the connecting groove 20; a first heat dissipation groove 22 is also provided on one side of the connecting groove 20; In addition, a second heat dissipation groove 21 can be provided on the bottom surface of the block 4, and the second heat dissipation groove 21 is connected to the second ventilation hole 7. The size of the second heat dissipation groove 21 and the first heat dissipation groove 22 is much smaller than the size of the second ventilation hole 7, and can be selected as needed.

[0049] According to an exemplary embodiment of this disclosure, the air outlets of the first heat dissipation groove 22 and the second heat dissipation groove 21 face the fixed end of the single-wave foil. The second heat dissipation groove 21 and the first heat dissipation groove 22 can divert a portion of the gas output from the air inlet 17 to dissipate heat from the wave foil assembly 3, which can effectively solve the problem of severe heat generation when the foil bearing is running at high speed, prevent thermal failure, and extend its service life.

[0050] According to exemplary embodiments of this disclosure, such as Figure 4 and Figure 1 As shown, a rear end cover 18 is provided at one end of the bearing housing 1. The rear end cover 18 is fixed to the bearing housing 1 by bolts. A retaining ring 19 is provided at the other end of the bearing housing 1 to limit the corrugated foil assembly 3 in the axial direction.

[0051] The installation and operation process of the above-mentioned dynamic and static pressure mixed radial foil bearing is as follows: the corrugated foil assembly 3 and the bushing 2 are installed in sequence on the inner side of the bearing seat 1, and the external high-pressure air source assembly is connected to the external air source.

[0052] The air inlet connector 17 passes through the third ventilation hole 6 and the second ventilation hole 7. The air outlet of the air inlet connector 17 is aligned with the first ventilation hole 8. The first connector of the first adapter 16 is connected to the air inlet of the air inlet connector 17. The second and third connectors of the first adapter 16 are respectively connected to the first adapter 16 on the same circumference through the air supply pipe 15. At the same time, the fourth connector of the first adapter 16 is connected to the second adapter 23 on the adjacent circumference in the axial direction through the air supply pipe 15. The second adapter 23 is connected to the air inlet connector 17.

[0053] Finally, the external air source output from the air outlet of the air inlet connector 17 is delivered to the gap between the dynamic and static pressure mixed radial foil bearing and the shaft. During low speed or start-stop phases, the external air source provides static pressure support to avoid wear between the shaft and the bushing 2. During high-speed operation, the dynamic pressure effect of the dynamic pressure foil bearing is enhanced, and the two work together to improve the load-bearing capacity throughout the entire operating range.

[0054] The foregoing description illustrates and describes preferred embodiments of this application. However, as previously understood, this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the conception herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A high-load-bearing, hydrostatic-dynamic hybrid radial foil bearing, characterized in that, It includes an external high-pressure air source assembly, a bearing housing, a bushing, and several corrugated foil assemblies, with the bushing, corrugated foil assemblies, and bearing housing arranged sequentially from the inside out; At least two stops are provided on the outer side of the bushing along the circumferential direction, and a limiting groove is provided on the inner wall of the bearing housing, with the stops fitted inside the limiting groove; in the circumferential direction, corrugated foil assemblies are spaced apart between the stops; a first ventilation hole is provided at the position of the bushing corresponding to the stop. The external high-pressure air source assembly includes an external air source and several air inlet connectors. The external air source is connected to the air inlet connectors. The air inlet connectors pass through the limiting groove and the stop block, and the air outlet of the air inlet connectors is connected to the first ventilation hole.

2. The high-load-bearing dynamic-static hybrid radial foil bearing according to claim 1, characterized in that, The external high-pressure gas source assembly also includes a first adapter, a second adapter, and a gas supply pipe. The second adapter is connected to the gas inlet connector, the first connector of the first adapter is connected to the gas inlet connector, and the second and third connectors of the first adapter are respectively connected to the gas supply pipe, thereby connecting all the first adapters on the same circumference. The first adapter also includes a fourth connector, which is connected to the second adapter on another circumference via the gas supply pipe. One of the first adapters is also provided with a fifth connector connected to the external gas source.

3. The high-load-bearing dynamic-static hybrid radial foil bearing according to claim 1, characterized in that, The width of the stop is less than the width of the limiting groove.

4. A high-load-bearing dynamic-static hybrid radial foil bearing according to claim 1, characterized in that, Each block is provided with a second ventilation hole, and the bottom of each limiting groove is provided with a third ventilation hole. The air inlet connector passes through the third ventilation hole and the second ventilation hole. The positions of the third ventilation hole, the second ventilation hole and the first ventilation hole are corresponding and set in a group.

5. A high-load-bearing dynamic-static hybrid radial foil bearing according to claim 4, characterized in that, The diameter of the third ventilation hole is larger than that of the second ventilation hole, and the diameter of the second ventilation hole is larger than that of the first ventilation hole.

6. A high-load-bearing dynamic-static hybrid radial foil bearing according to claim 4, characterized in that, The upper end of the air inlet connector passes through the third ventilation hole, and the outer diameter of the upper end of the air inlet connector is smaller than the outer diameter of the third ventilation hole; the lower end of the air inlet connector is threaded to the inner wall of the second ventilation hole.

7. A high-load-bearing dynamic-static hybrid radial foil bearing according to claim 4, characterized in that, The corrugated foil assembly includes a bottom foil, single corrugated foils, and flat foils. The inner side of the bottom foil is provided with one or more single corrugated foils along the axial direction, and one end of the single corrugated foil is a fixed end, while the other end is a free end. In the circumferential direction, two flat foils are provided on the top of each single corrugated foil.

8. A high-load-bearing dynamic-static hybrid radial foil bearing according to claim 7, characterized in that, The single-wave foil includes several three-level elastic units arranged along the circumferential direction. The three-level elastic units include a first arc, a second arc, and a third arc connected in sequence, and the height of the first arc is greater than the height of the second arc, and the height of the second arc is greater than the height of the third arc.

9. A high-load-bearing dynamic-static hybrid radial foil bearing according to claim 7, characterized in that, A connecting groove is formed on the bottom surface of the block, and the connecting groove connects to an adjacent second ventilation hole. A first heat dissipation groove is also provided on one side of the connecting groove. And / or, the bottom surface of the block is also provided with a second heat dissipation groove, and the second heat dissipation groove is connected to the second ventilation hole.

10. A high-load-bearing dynamic-static hybrid radial foil bearing according to claim 7, characterized in that, The air outlets of the first / second heat dissipation slots face the fixed end of the single-wave foil.

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