Gas dynamic pressure radial bearing, air levitated rotating machine

Abstract

The application provides a gas dynamic pressure radial bearing and an air suspension rotating machine. The gas dynamic pressure radial bearing comprises a bearing seat, a first top foil and a wave foil supported between an inner ring wall surface of the bearing seat and an outer circular wall surface of the first top foil. The first top foil has a first free end and a first fixed end for fixed connection with the bearing seat. The first free end has a top foil protruding section extending along a circumferential length of the first top foil. The first fixed end has a top foil groove extending along the circumferential length of the first top foil. In a working state of the first top foil, the top foil protruding section is inserted into the top foil groove along the circumferential length of the first top foil. The application reduces a support load dead zone of a rotor, improves bearing load performance and operation reliability, improves stability of a shaft system, and reduces a risk of wear and even failure of the shaft system.

Description

Technical Field

[0001] This invention belongs to the field of gas dynamic bearing design technology, specifically relating to a gas dynamic radial bearing and an air-suspended rotating machine. Background Technology

[0002] Gas hydrodynamic bearings are self-acting hydrodynamic bearings that use gas as the lubricating medium. They have advantages such as high precision, no pollution, high speed and simple structure. They have a very broad application prospect in the fields of high-speed turbines, machine tool manufacturing and space technology. Gas hydrodynamic bearings have been widely used in high-speed rotating machinery such as turbojet engines, micro gas turbines, aircraft air circulation machines and air-suspended centrifugal blowers at home and abroad.

[0003] A gas dynamic radial bearing generally consists of a top foil and a support structure. The support structure, such as a corrugated foil, is connected to the inner wall of the bearing housing, and the top foil is installed on the inner wall of the corrugated foil. The two ends of the top foil and the corrugated foil in the circumferential direction are called the free end and the fixed end, respectively.

[0004] The invention patent with patent application number 202011008107.2 discloses a foil for an air-bearing radial bearing. It uses two inner foils with opposite rotation to build up to improve the wear of the radial foil. The free end of the inner foil is circumferentially rolled and extended to the fixed end to reduce the nominal design clearance of the bearing and improve the bearing performance. However, due to the overlapping method, there is still a sudden change area in the air gap (working dead zone) at the free end of the foil. When the minimum clearance of the rotor appears at the free end, the load-bearing capacity is insufficient, which leads to unstable operation of the shaft system and even serious shaft wear or failure. Summary of the Invention

[0005] Therefore, the present invention provides a gas dynamic radial bearing and an air-suspended rotating machine, which can overcome the shortcomings of the gas dynamic radial bearing in the related art, where the free ends of the foils are overlapped, resulting in a sudden change in air gap. When the minimum clearance of the rotor appears at the free end, the bearing load-bearing capacity is insufficient, leading to unstable shaft operation and the risk of shaft wear or even failure.

[0006] To address the aforementioned problems, the present invention provides a gas dynamic radial bearing, comprising a bearing housing, a first top foil, and a corrugated foil supported between the inner annular wall of the bearing housing and the outer circular wall of the first top foil. The first top foil has a first free end and a first fixed end for fixed connection with the bearing housing. The first free end has a top foil protrusion extending along the circumferential length of the first top foil, and the first fixed end has a top foil groove extending along the circumferential length of the first top foil. When the first top foil is in the working state, the top foil protrusion is inserted into the top foil groove along the circumference of the first top foil.

[0007] In some embodiments, both the top foil protrusion and the top foil groove are provided, and both the top foil protrusion and the top foil groove are located in the central region of the axial width of the first top foil sheet.

[0008] In some embodiments, the axial width of the top foil protrusion is b, and the axial width of the top foil groove is a, where 0 < ab ≤ 1 mm.

[0009] In some embodiments, the total axial width of the first top foil is L, where 25% L≤b≤50%L.

[0010] In some embodiments, the radial plane passing through the midpoint of the axial thickness of the first top foil is the plane of symmetry of the first top foil, and the top foil protrusion and the top foil groove are symmetrical about the plane of symmetry.

[0011] In some embodiments, the first fixed end has a first bent section extending toward one side of the bearing housing, the first bent section being located on both sides of the top foil groove, and an assembly positioning groove is formed on the inner ring wall of the bearing housing, the first bent section being inserted into the assembly positioning groove.

[0012] In some embodiments, the corrugated foil has a corrugated foil free end corresponding to the position of the first free end and a corrugated foil fixed end corresponding to the position of the first fixed end, wherein the corrugated foil fixed end has a corrugated foil bent section inserted into the assembly positioning groove.

[0013] In some embodiments, the free end of the corrugated foil has a corrugated foil protrusion extending along the circumferential length of the first top foil, and the fixed end of the corrugated foil has a corrugated foil groove extending along the circumferential length of the first top foil. When the corrugated foil is in the working state, the corrugated foil protrusion is inserted into the corrugated foil groove along the circumference of the first top foil.

[0014] In some embodiments, the axial width of the corrugated foil protrusion is smaller than the axial width of the top foil protrusion, and the axial width of the corrugated foil groove is larger than the axial width of the top foil groove.

[0015] In some embodiments, a second top foil is provided between the first top foil and the corrugated foil. The second fixed end of the second top foil is inserted into the assembly positioning groove through a second bending section. The second free end of the second top foil is a straight end, and the end face of the straight end is disposed adjacent to the second bending section.

[0016] In some embodiments, when the first top foil is in the working state, the central angle corresponding to the protruding section of the top foil is θ2, and the central angle corresponding to the groove of the top foil is θ1, θ1 < θ2, and / or, 15° ≤ θ1 ≤ 90°, 15° ≤ θ2 ≤ 90°.

[0017] The present invention also provides an air-suspended rotating machine, including the above-mentioned gas dynamic radial bearing.

[0018] The gas dynamic radial bearing and air-suspended rotating machinery provided by this invention have the following beneficial effects:

[0019] A top foil protrusion is provided at the first free end of the first top foil sheet, extending further along its circumferential length. The top foil protrusion is inserted into the top foil groove at the first fixed end of the first top foil sheet. In the use state, the radially inner arc surface of the top foil protrusion is on the same cylindrical surface as the radially inner arc surface of other parts of the first top foil sheet. The top foil protrusion eliminates the original load-bearing dead zone between the first free end and the first fixed end at its location, minimizes the load-bearing dead zone on the rotor, and improves the bearing load-bearing performance and operational reliability. When the minimum clearance of the rotor appears at the free end, the improved bearing load-bearing performance can enhance the stability of the shaft system operation and reduce the risk of shaft system wear or even failure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a gas dynamic radial bearing according to one embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3 yes Figure 1 A three-dimensional structural diagram of the gas dynamic radial bearing after omitting the bearing housing;

[0024] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0025] Figure 5 yes Figure 1 A three-dimensional structural diagram of the first top foil in the middle;

[0026] Figure 6 yes Figure 5 A schematic diagram of the structure in which the first top foil is in a flat state;

[0027] Figure 7 yes Figure 1 A schematic diagram of the three-dimensional structure of the corrugated foil in the image;

[0028] Figure 8 This is a three-dimensional structural schematic diagram of a gas dynamic radial bearing according to another embodiment of the present invention;

[0029] Figure 9 yes Figure 8 A magnified view of a section at point C.

[0030] The attached figures are labeled as follows:

[0031] 1. Bearing housing; 11. Assembly positioning groove; 2. First top foil; 201. First free end; 202. First fixed end; 21. Top foil extension section; 22. Top foil groove; 23. First bending section; 3. Corrugated foil; 301. Corrugated foil free end; 302. Corrugated foil fixed end; 31. Corrugated foil extension section; 32. Corrugated foil groove; 33. Corrugated foil bending section; 4. Second top foil; 401. Second free end; 402. Second fixed end; 41. Second bending section. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0033] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0034] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0036] See Figures 1 to 9 As shown, according to an embodiment of the present invention, a gas dynamic radial bearing is provided, including a bearing housing 1, a first top foil 2, and a corrugated foil 3 supported between the inner ring wall of the bearing housing 1 and the outer circular wall of the first top foil 2. The first top foil 2 has a first free end 201 and a first fixed end 202 for fixed connection with the bearing housing 1. The first free end 201 has a top foil protrusion 21 extending along the circumferential (i.e., circumferential direction) length of the first top foil 2. The first fixed end 202 has a top foil groove 22 extending along the circumferential length of the first top foil 2. When the first top foil 2 is in the working state, the top foil protrusion 21 is inserted into the top foil groove 22 along the circumferential direction of the first top foil 2. It is understood that after the aforementioned top foil protrusion 21 is inserted into the top foil groove 22, the radially inner arc surface of the top foil protrusion 21 is on the same cylindrical surface as the radially inner arc surface of other parts of the first top foil 2.

[0037] In this technical solution, a top foil extension section 21 extending further along its circumferential length is provided at the first free end 201 of the first top foil 2. The top foil extension section 21 is inserted into the top foil groove 22 at the first fixed end 202 of the first top foil 2. In the use state, the radial inner arc surface of the top foil extension section 21 is on the same cylindrical surface as the radial inner arc surface of other parts of the first top foil 2. The top foil extension section 21 eliminates the original load dead zone between the first free end 201 and the first fixed end 202 at its location, minimizes the load dead zone on the rotor, improves the bearing load performance and operational reliability. When the minimum clearance of the rotor appears at the free end, the improved bearing load performance can enhance the stability of the shaft system operation and reduce the risk of shaft system wear or even failure.

[0038] In some embodiments, multiple top foil protrusions 21 can be simultaneously provided on the same first top foil sheet 2. Correspondingly, multiple top foil grooves 22 are provided simultaneously. Each top foil protrusion 21 can be inserted into each top foil groove 22 in a one-to-one correspondence. Each top foil protrusion 21 can be spaced apart along the axial direction of the first top foil sheet 2. In some embodiments, each top foil protrusion 21 and each top foil groove 22 is provided. Both the top foil protrusion 21 and the top foil groove 22 are located in the central region of the axial width of the first top foil sheet 2.

[0039] In this technical solution, only one top foil protrusion 21 and one top foil groove 22 are provided on the first top foil 2. This can prevent the provision of multiple top foil protrusions 21 and top foil grooves 22 from reducing the structural strength of the first top foil 2. Thus, under the premise of improving the bearing load-bearing performance and meeting the requirement of no dead zone on the circumference, the structural reliability of the bearing is ensured.

[0040] In addition, it should be noted that by setting the top foil protrusion 21 and the top foil groove 22 in the central region of the axial width of the first top foil 2, since there are corresponding portions of the top foil on both sides of the axial direction of the top foil protrusion 21 (the axial direction is also the axial direction of the first top foil 2), the end leakage in this region can be significantly reduced, and the bearing capacity can be further improved.

[0041] It is understood that the aforementioned top foil protrusion 21 and top foil groove 22 are arranged to form a concave-convex-concave multi-segment structure in the axial direction of the first top foil 2. In the use state, the first free end 201 and the corresponding concave-convex structure on the first fixed end 202 form a circumferentially embedded structure.

[0042] To ensure no physical interference between the top foil protrusion 21 and the top foil groove 22, a gap should be maintained between them after insertion. In some embodiments, the axial width of the top foil protrusion 21 is b, see details below. Figure 6As shown, the axial width of the top foil groove 22 is a, 0 < ab ≤ 1 mm. Specifically, the aforementioned top foil protrusion 21 and top foil groove 22 are rectangles with mutually compatible shapes.

[0043] In this technical solution, the difference between the axial width of the top foil groove 22 and the axial width of the top foil protrusion 21 is limited to no more than 1 mm, which can ensure that the two can be inserted without interference, while preventing the leakage of the pressure gas film caused by the gap between them being too small.

[0044] In some embodiments, when the first top foil 2 is in use, the gap formed by the aforementioned top foil protrusion 21 and the top foil groove 22 in the circumferential direction of the first top foil 2 should not exceed 1 mm as much as possible, and should be equal to the aforementioned (ab).

[0045] In some embodiments, the total axial width of the first top foil 2 is L, where 25% L≤b≤50%L. The aforementioned total axial width of the first top foil 2 is... Figure 6 The range shown is for reference only, that is, the length between the upper edge and the lower edge of the first top foil 2.

[0046] In this technical solution, when the axial width b of the extended section 21 of the first top foil 2 is less than 25% L, the bearing bearing area is small and the bearing capacity is low due to the small width of the extended section 21, which poses a risk of failure under heavy load or impact. When the axial width b of the extended section 21 of the first top foil 2 is greater than 50% L, the total width of the non-extended section is short, and the bearing bearing area at the free end of the extended section 21 is small and the bearing capacity is low, which poses a risk of failure under heavy load or impact.

[0047] In some embodiments, the radial plane passing through the midpoint of the axial thickness of the first top foil 2 is the plane of symmetry of the first top foil 2, and the top foil protrusion 21 and the top foil groove 22 are symmetrical about the plane of symmetry, as shown in the figure below. Figure 6 The s-plane indicated in the text.

[0048] In this technical solution, both the top foil protrusion 21 and the top foil groove 22 are designed to be symmetrical about the symmetrical surface, which makes the axial load-bearing capacity of the first top foil 2 on the rotor more balanced and prevents the rotor from tilting due to the large difference in its axial load-bearing capacity.

[0049] In some embodiments, the first fixed end 202 has a first bent section 23 extending toward one side of the bearing seat 1. The first bent section 23 is located on both sides of the top foil groove 22. An assembly positioning groove 11 is formed on the inner ring wall of the bearing seat 1. The first bent section 23 is inserted into the assembly positioning groove 11. Specifically, the first bent section 23 and the assembly positioning groove 11 can be inserted with a small gap to facilitate the easy loading and unloading of the first top foil 2.

[0050] Specifically, the aforementioned first top foil 2 is an integral structure, that is, the aforementioned top foil extension section 21, top foil groove 22 and first bending section 23 are integrally formed on the main body of the first top foil 2.

[0051] In some embodiments, the corrugated foil 3 has a corrugated foil free end 301 corresponding to the position of the first free end 201 and a corrugated foil fixed end 302 corresponding to the position of the first fixed end 202. The corrugated foil bent section 33 of the corrugated foil fixed end 302 is inserted into the assembly positioning groove 11. That is, only one corrugated foil 3 is provided on the radial outer side of the first top foil 2.

[0052] In this technical solution, the corrugated foil bending section 33 and the first bending section 23 are inserted into the same assembly positioning groove 11, eliminating the need for an assembly groove for the corrugated foil bending section 33 on the inner ring wall of the bearing seat 1, thus simplifying the processing. In addition, the first bending section 23 and the corrugated foil bending section 33 assembled in the same assembly positioning groove 11 can also improve the frictional damping between them, reduce the probability of the corrugated foil 3 and the first top foil 2 coming off, and improve the connection reliability.

[0053] In some embodiments, the free end 301 of the corrugated foil has a corrugated foil protrusion 31 extending along the circumferential length of the first top foil 2, and the fixed end 302 of the corrugated foil has a corrugated foil groove 32 extending along the circumferential length of the first top foil 2. When the corrugated foil 3 is in the working state, the corrugated foil protrusion 31 is inserted into the corrugated foil groove 32 along the circumference of the first top foil 2.

[0054] In this technical solution, the corrugated foil 3 is provided with the corrugated foil protrusion 31 and the corrugated foil groove 32 at the positions corresponding to the top foil protrusion 21 and the top foil groove 22 of the first top foil 2, which can further improve the elastic support effect of the corrugated foil 3 on the first top foil 2.

[0055] In some embodiments, the axial width of the corrugated foil protrusion 31 is smaller than the axial width of the top foil protrusion 21, and the axial width of the corrugated foil groove 32 is larger than the axial width of the top foil groove 22. Specifically, the aforementioned corrugated foil protrusion 31 and corrugated foil groove 32 are also symmetrical about the aforementioned symmetrical plane.

[0056] In this technical solution, the axial width of the corrugated foil extension section 31 is smaller than the axial width of the top foil extension section 21, and the axial width of the corrugated foil groove 32 is larger than the axial width of the top foil groove 22. This allows a pressure air receiving cavity to be formed in the gap between the top foil extension section 21 and the top foil groove 22. The pressure air enters the bearing area of ​​the foil on both sides of the axial direction of the top foil extension section 21, suppressing the leakage of high pressure gas from the top foil extension section 21 and improving the bearing capacity.

[0057] In some embodiments, the extension length of the aforementioned corrugated foil extension section 31 may be approximately the same as the extension length of the top foil extension section 21.

[0058] See details Figure 8 and Figure 9 As shown, in some embodiments, a second top foil 4 is provided between the first top foil 2 and the corrugated foil 3. The second fixed end 402 of the second top foil 4 is inserted into the assembly positioning groove 11 through the second bending section 41. The second free end 401 of the second top foil 4 is a straight end. The aforementioned straight end refers to the end face of the free end being a plane that extends in a straight line along the bearing axis, rather than the aforementioned axial segmented structure with a top foil protrusion section 21. The end face of the straight end is arranged adjacent to the second bending section 41. Under the premise of ensuring that the second free end 401 and the second fixed end 402 do not structurally interfere with each other, the gap between the two should be as small as possible.

[0059] In this technical solution, a second top foil 4 is further provided between the corrugated foil 3 and the first top foil 2, which can suppress the leakage of high-pressure gas inside the bearing from the gap between the aforementioned top foil extension section 21 and the top foil groove 22 to the corrugated foil 3 and the bearing seat 1, thereby improving the bearing load-bearing performance; at the same time, the double-layer top foil structure can increase the bearing damping and further improve the bearing's impact resistance.

[0060] In some embodiments, when the first top foil 2 is in the working state, the central angle corresponding to the top foil protrusion 21 is θ2, and the central angle corresponding to the top foil groove 22 is θ1, θ1 < θ2, and / or, 15° ≤ θ1 ≤ 90°, 15° ≤ θ2 ≤ 90°.

[0061] In this technical solution, when the top foil protrusion section 21 is too small, the first free end 201 section cannot provide support, and is only supported by the first fixed end 202. The support section area is small, and the bearing load-bearing performance is poor. When the top foil protrusion section 21 is too large, the bearing support section is supported by the first free end 201 and the first fixed end 202. Because there is a gap between the two, the bearing load-bearing area is reduced, resulting in a decrease in bearing performance when the bearing working area is at the non-free end.

[0062] The aforementioned θ1 and θ2 are the offset angles between the protruding section and the groove. This offset angle is affected by the radial load and vibration value fluctuations. As θ increases, the area of ​​the bearing support bearing area decreases, and the bearing performance decreases. Under the same load, the larger the offset angle, the more stable the bearing operation and the more suitable it is for test environments with large vibrations. Therefore, a smaller θ is suitable for test environments with large loads and small vibrations, while a larger θ is suitable for test environments with small loads and large vibrations.

[0063] According to an embodiment of the present invention, an air-suspended rotating machine is also provided, including the aforementioned gas dynamic radial bearing. The aforementioned air-suspended rotating machine can be, for example, a turbojet engine, an aircraft air circulator, an air-suspended centrifugal blower, a micro gas turbine, or other high-speed rotating machinery.

[0064] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment 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 technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A gas dynamic radial bearing, characterized in that, The assembly includes a bearing housing (1), a first top foil (2), and a corrugated foil (3) supported between the inner ring wall of the bearing housing (1) and the outer ring wall of the first top foil (2). The first top foil (2) has a first free end (201) and a first fixed end (202) for fixed connection with the bearing housing (1). The first free end (201) has a top foil protrusion (21) extending along the circumferential length of the first top foil (2), and the first fixed end (202) has a top foil groove (22) extending along the circumferential length of the first top foil (2). When the first top foil (2) is in the working state, the top foil protrusion (21) is inserted into the top foil groove (22) along the circumferential direction of the first top foil (2).

2. The gas dynamic radial bearing according to claim 1, characterized in that, Both the top foil protrusion (21) and the top foil groove (22) are provided, and both the top foil protrusion (21) and the top foil groove (22) are located in the central region of the axial width of the first top foil sheet (2).

3. The gas dynamic radial bearing according to claim 2, characterized in that, The axial width of the top foil protrusion (21) is b, and the axial width of the top foil groove (22) is a, 0 < ab ≤ 1 mm.

4. The gas dynamic radial bearing according to claim 3, characterized in that, The total axial width of the first top foil (2) is L, 25% L≤b≤50%L.

5. The gas dynamic radial bearing according to claim 2, characterized in that, The radial plane passing through the midpoint of the axial thickness of the first top foil (2) is the symmetry plane of the first top foil (2), and the top foil protrusion (21) and the top foil groove (22) are symmetrical about the symmetry plane.

6. The gas dynamic radial bearing according to claim 1, characterized in that, The first fixed end (202) has a first bent section (23) extending toward the bearing seat (1) side. The first bent section (23) is located on both sides of the top foil groove (22). An assembly positioning groove (11) is formed on the inner ring wall of the bearing seat (1). The first bent section (23) is inserted into the assembly positioning groove (11).

7. The gas dynamic radial bearing according to claim 6, characterized in that, The corrugated foil (3) has a corrugated foil free end (301) corresponding to the position of the first free end (201) and a corrugated foil fixed end (302) corresponding to the position of the first fixed end (202). The corrugated foil fixed end (302) has a corrugated foil bending section (33) inserted into the assembly positioning groove (11).

8. The gas dynamic radial bearing according to claim 7, characterized in that, The free end (301) of the corrugated foil has a corrugated foil protrusion (31) extending along the circumferential length of the first top foil (2), and the fixed end (302) of the corrugated foil has a corrugated foil groove (32) extending along the circumferential length of the first top foil (2). When the corrugated foil (3) is in the working state, the corrugated foil protrusion (31) is inserted into the corrugated foil groove (32) along the circumferential direction of the first top foil (2).

9. The gas dynamic radial bearing according to claim 8, characterized in that, The axial width of the corrugated foil protrusion (31) is smaller than the axial width of the top foil protrusion (21), and the axial width of the corrugated foil groove (32) is larger than the axial width of the top foil groove (22).

10. The gas dynamic radial bearing according to claim 6, characterized in that, A second top foil (4) is provided between the first top foil (2) and the wave foil (3). The second fixed end (402) of the second top foil (4) is inserted into the assembly positioning groove (11) through the second bending section (41). The second free end (401) of the second top foil (4) is a straight end, and the end face of the straight end is adjacent to the second bending section (41).

11. The gas dynamic radial bearing according to claim 1, characterized in that, When the first top foil (2) is in working condition, the central angle corresponding to the top foil protrusion (21) is θ2, and the central angle corresponding to the top foil groove (22) is θ1, θ1 < θ2, and / or, 15° ≤ θ1 ≤ 90°, 15° ≤ θ2 ≤ 90°.

12. An air-suspended rotating machine, characterized in that, The gas dynamic radial bearing includes any one of claims 1 to 11.

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