Dynamic pressure gas foil bearing and rotary machine

Abstract

The utility model provides a dynamic pressure gas foil bearing and a rotary machine. The dynamic pressure gas foil bearing comprises a supporting bottom shell; the more than two wave-shaped foil supporting parts are arranged on one side of the supporting bottom shell and are uniformly arranged along the circumferential direction of the dynamic pressure gas foil bearing; the more than two top-layer foils are arranged on one sides, far away from the supporting bottom shell, of the waveform foil supporting parts, are uniformly arranged along the circumferential direction, are in one-to-one correspondence with the more than two waveform foil supporting parts, are mounted on the supporting bottom shell, and comprise first ends and second ends which are oppositely arranged along the circumferential direction of the dynamic pressure gas foil bearing; the first end and the second end of the top-layer foil are gradually close to the supporting bottom shell in the circumferential direction from the side close to the circumferential middle of the top-layer foil to the side close to the circumferential edge of the top-layer foil to form a wedge-shaped structure. The dynamic pressure gas foil bearing has the reverse rotation adaptive capacity.

Description

Technical Field

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

[0002] Hydrodynamic gas foil bearings have many advantages such as oil-free, pollution-free, low running resistance, simple structure, and low mechanical loss. They make up for the shortcomings of traditional liquid bearings, sliding bearings, and rolling bearings, and have been widely used in high-speed rotating machinery and precision processing machinery.

[0003] The hydrodynamic gas foil bearing utilizes the wedge effect created by the wedge-shaped space between the rotor's bearing plate or journal and the bearing surface of the hydrodynamic gas foil bearing to form a hydrodynamic gas film to withstand the forces acting on the rotor. Its operating principle is as follows: As the rotor speed increases, the gas surrounding the hydrodynamic gas foil bearing is continuously drawn into the wedge-shaped space due to the viscosity of the gas, causing the air pressure within the wedge-shaped space to continuously increase. When the rotor speed reaches a certain value, a hydrodynamic gas film is formed, and a stable gas lubrication state is achieved. Under the hydrodynamic effect, the higher the rotor speed, the greater the load-bearing capacity of the hydrodynamic gas foil bearing. The hydrodynamic gas film formed by the gas bears the load and greatly reduces friction.

[0004] During high-load operation of rotating machinery, such as refrigeration centrifugal compressors or blowers, in the event of an abnormal shutdown or an urgent need for rapid load reduction, the high-pressure side pressure cannot be quickly reduced. In the event of a loss of power, the rotor is prone to reverse rotation due to the high pressure differential. However, conventional hydrodynamic gas foil bearings generally lack anti-reverse capability. In the event of rotor reverse rotation, the hydrodynamic gas foil bearing cannot form a hydrodynamic gas film, potentially causing damage or even destruction.

[0005] The above statements are only used to provide background technical information related to the present application and do not necessarily constitute prior art. Utility Model Content

[0006] The purpose of the present application is to provide a dynamic pressure gas foil bearing and a rotating machine with reverse adaptability.

[0007] A first aspect of the present application provides a dynamic pressure gas foil bearing, comprising:

[0008] Supporting the bottom shell;

[0009] Two or more corrugated foil support portions are provided on one side of the support bottom shell and are evenly arranged along the circumference of the dynamic pressure gas foil bearing; and

[0010] Two or more top-layer foils are arranged on a side of the corrugated foil support portion away from the support bottom shell, are evenly arranged along the circumference and correspond one-to-one to the two or more corrugated foil support portions. The top-layer foil is installed on the support bottom shell, and includes a first end and a second end that are relatively arranged along the circumference of the dynamic pressure gas foil bearing. The first end and the second end of the top-layer foil respectively form a wedge-shaped structure along the circumference from a side close to the circumferential middle of the top-layer foil to a side of the circumferential edge of the top-layer foil.

[0011] In the dynamic pressure gas foil bearing of some embodiments, the corrugated foil support portion is symmetrically arranged with respect to the circumferential direction.

[0012] In some embodiments of the hydrodynamic gas foil bearing, the corrugated foil support portion includes two corrugated foils symmetrically arranged relative to the circumference, and the corrugated foil is installed on the support bottom shell, including a first end and a second end oppositely arranged along the circumference, and the second ends of the two corrugated foils are adjacent.

[0013] In some embodiments of the hydrodynamic gas foil bearing, the corrugated foil has a plurality of parallel and spaced strip-shaped protrusions parallel to the edge of the first end thereof and protruding toward the corresponding top foil.

[0014] In some embodiments of the hydrodynamic gas foil bearing, the corrugated foil has an open groove with an opening located at the second end thereof.

[0015] In the hydrodynamic gas foil bearing of some embodiments, the open groove extends along the circumferential direction.

[0016] In the hydrodynamic gas foil bearing of some embodiments, the open groove extends along the circumferential direction to the circumferential middle of the corrugated foil.

[0017] In some embodiments of the dynamic pressure gas foil bearing, the corrugated foil includes two or more open grooves arranged side by side.

[0018] In some embodiments of the hydrodynamic gas foil bearing, the corrugated foil includes two or more open grooves arranged side by side and at intervals along the radial direction of the hydrodynamic gas foil bearing, and the extension length of the open grooves of the corrugated foil close to the radial outer side is greater than the extension length of the open grooves close to the radial inner side.

[0019] In some embodiments of the hydrodynamic gas foil bearing,

[0020] The open groove close to the radial outer side of the corrugated foil extends along the circumferential direction to the circumferential middle of the corrugated foil, and an end of the open groove away from the opening thereof passes over the circumferential center line of the corrugated foil;

[0021] The open groove near the radial inner side of the corrugated foil extends along the circumferential direction to the circumferential middle of the corrugated foil, and an end of the open groove away from the opening is spaced from the circumferential center line of the dynamic pressure gas foil bearing.

[0022] In some embodiments of the hydrodynamic gas foil bearing,

[0023] The first end of the corrugated foil is a fixed end fixedly connected to the supporting bottom shell;

[0024] The second end of the corrugated foil is a movable end that is movable relative to the supporting bottom shell.

[0025] In the hydrodynamic gas foil bearing of some embodiments, a gap is provided between the second ends of the two corrugated foils.

[0026] In the hydrodynamic gas foil bearing of some embodiments, the gap between the second ends of the two corrugated foils is 0.5 mm to 1.5 mm.

[0027] In the dynamic pressure gas foil bearing of some embodiments, the first end of the corrugated foil is fixed to the supporting bottom shell by spot welding.

[0028] In some embodiments of the hydrodynamic gas foil bearing,

[0029] The first end of the top foil is a fixed end fixedly connected to the supporting bottom shell, and the second end of the top foil is a movable end movable relative to the supporting bottom shell; or

[0030] The first end and the second end of the top foil are both movable ends that are movable relative to the supporting bottom shell.

[0031] In some embodiments of the hydrodynamic gas foil bearing,

[0032] The supporting bottom shell includes a fixed mounting portion and a movable mounting portion, the fixed end of the top foil is fixedly connected to the fixed mounting portion, and the movable end of the top foil is movably mounted on the movable mounting portion; or

[0033] The supporting bottom shell includes two movable mounting parts, and the first end and the second end of the top foil are movable ends respectively movably mounted on the two movable mounting parts.

[0034] In some embodiments of the hydrodynamic gas foil bearing,

[0035] The fixed mounting portion includes a mounting boss, and the fixed end of the top foil is connected to the mounting boss by spot welding; and / or

[0036] The movable mounting portion includes a limiting groove, and the movable end of the top foil is inserted into the limiting groove, and has a movable margin with the limiting groove.

[0037] In some embodiments of the hydrodynamic gas foil bearing,

[0038] There are 5 to 12 welding points arranged along the radial direction between the fixed end of the top foil and the mounting boss; and / or

[0039] The angle between the depth direction of the limiting groove and the bearing surface of the top foil bearing area (B) of the top foil is an obtuse angle; and / or

[0040] The movable end of the top foil and the limiting groove have the movable margin in the thickness direction of the top foil and / or have the movable margin in the length direction of the top foil.

[0041] In some embodiments of the hydrodynamic gas foil bearing,

[0042] The angle is 140° to 170°; and / or

[0043] The installation gap between the movable end of the top foil and the limiting groove in the thickness direction of the top foil is 0.1mm to 0.2mm; and / or

[0044] An installation gap between the movable end of the top foil and the limiting groove in the length direction of the top foil is 0.1 mm to 0.2 mm.

[0045] In some embodiments of the hydrodynamic gas foil bearing, a depth h1 of the wedge-shaped structure at the first end of the top foil is smaller than a depth h2 of the wedge-shaped structure at the second end of the top foil.

[0046] In some embodiments of the hydrodynamic gas foil bearing,

[0047] 0.05mm≤h1≤0.2mm; and / or

[0048] 0.05mm≤h2≤0.2mm; and / or

[0049] 0.05mm≤h2-h1≤0.2mm.

[0050] In some embodiments of the hydrodynamic gas foil bearing,

[0051] The dynamic pressure gas foil bearing is a dynamic pressure gas foil thrust bearing; or

[0052] The dynamic pressure gas foil bearing is a dynamic pressure gas foil radial bearing.

[0053] A second aspect of the present application provides a rotating machine, comprising the dynamic pressure gas foil bearing described in the first aspect of the present application.

[0054] Based on the dynamic pressure gas foil bearing provided by the present application, the first end and the second end of the top foil respectively form a wedge-shaped structure along the circumferential direction from the side close to the circumferential middle of the top foil to the side of the circumferential edge of the top foil gradually approaching the supporting bottom shell, and both circumferential ends of the top foil are set to wedge structures. When the rotor of the rotating machinery where the dynamic pressure gas foil bearing is located rotates forward, a wedge-shaped space is formed between the wedge-shaped structure at one circumferential end of the top foil and the rotor, which can form a dynamic pressure gas film to bear the force of the rotor. When reversal occurs, a wedge-shaped space can also be formed between the wedge-shaped structure at the other circumferential end of the top foil and the rotor, and a dynamic pressure gas film can also be formed to bear the force of the rotor, so that the dynamic pressure gas foil bearing can still maintain its normal working form, and will not be damaged or even destroyed due to the inability to form a dynamic pressure gas film, thereby having reversal adaptability. The dynamic pressure gas foil bearing is provided with more than two corrugated foil support parts and corresponding top foils evenly distributed along the circumference, so that a plurality of wedge-shaped spaces evenly distributed along the circumference can be formed between the dynamic pressure gas foil bearing and the rotor of the rotating machinery adopting the dynamic pressure gas foil bearing, thereby facilitating the rapid formation of a stable dynamic pressure gas film around the rotor, thereby facilitating the dynamic pressure gas foil bearing to quickly form a stable supporting force on the rotor regardless of whether the rotor rotates forward or reverse.

[0055] The rotating machinery provided by the present application has the advantages of the dynamic pressure gas foil bearing provided by the present application.

[0056] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0058] Figure 1 This is a schematic structural diagram of a hydrodynamic gas foil bearing according to some embodiments of the present application, wherein the hydrodynamic gas foil bearing is a hydrodynamic gas foil thrust bearing.

[0059] Figure 2 for Figure 1 A partial structural schematic diagram of a dynamic pressure gas foil bearing of the illustrated embodiment shows a top foil, a corrugated foil support portion corresponding to the top foil, and a corresponding partial support bottom shell.

[0060] Figure 3 for Figure 1Schematic diagram of the structure of the corrugated foil support portion of the dynamic pressure gas foil bearing of the embodiment shown.

[0061] Figure 4 for Figure 1 A schematic structural diagram of the corrugated foil of the corrugated foil support portion of the dynamic pressure gas foil bearing in the illustrated embodiment.

[0062] Figure 5 This is a schematic structural diagram of a hydrodynamic gas foil bearing according to some other embodiments of the present application, wherein the hydrodynamic gas foil bearing is a hydrodynamic gas foil radial bearing, and only the supporting bottom shell and the top foil are schematically shown.

[0063] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of part A.

[0064] Figures 1 to 6 In the figure, each reference numeral represents:

[0065] 1. Support the bottom shell;

[0066] 11. Fixed installation part;

[0067] 111. Install the boss;

[0068] 12. Movable installation department;

[0069] 121, limit slot;

[0070] 2. Corrugated foil support part;

[0071] 21. Corrugated foil;

[0072] 21A, a first end of the corrugated foil;

[0073] 21B, second end of the corrugated foil;

[0074] 211, strip-shaped protrusion;

[0075] 212, open slot;

[0076] 2121, open your mouth;

[0077] 3. Top foil;

[0078] 3A, first end of the top foil;

[0079] 3B, the second end of the top foil;

[0080] S, solder joint;

[0081] R, rotor rotation direction;

[0082] B. Top foil bearing area. DETAILED DESCRIPTION

[0083] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0084] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0085] In the description of this application, it should be understood that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0086] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0087] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0088] In the following description, unless otherwise specified, the terms “circumferential direction”, “radial direction” and “axial direction” refer to the circumferential direction, radial direction and axial direction of the hydrodynamic gas foil bearing.

[0089] In order to solve the problem that the hydrodynamic gas foil bearing in the related art does not have the ability to adapt to reversal, when the rotor of the rotating machinery using the hydrodynamic gas foil bearing is reversed, the hydrodynamic gas foil bearing may be damaged or even destroyed due to the inability to form a hydrodynamic gas film, an embodiment of the present application provides a hydrodynamic gas foil bearing.

[0090] like Figures 1 to 6 As shown, an embodiment of the present application provides a dynamic pressure gas foil bearing, comprising a supporting bottom shell 1, two or more corrugated foil support parts 2 and two or more top foils 3. The corrugated foil support part 2 is arranged on one side of the supporting bottom shell 1, and the two or more top foils are evenly arranged along the circumference of the dynamic pressure gas foil bearing. The top foil 3 is arranged on the side of the corrugated foil support part 2 away from the supporting bottom shell 1, and the two or more top foils are evenly arranged along the circumference and correspond one to one with the two or more corrugated foil support parts 2. The top foil 3 is installed on the supporting bottom shell 1. The top foil 3 includes a first end 3A and a second end 3B that are relatively arranged along the circumference of the dynamic pressure gas foil bearing. The first end 3A and the second end 3B of the top foil 3 are respectively circumferentially close to the supporting bottom shell 1 from the side close to the circumferential middle of the top foil 3 to the side of the circumferential edge of the top foil 3, thereby forming a wedge-shaped structure.

[0091] The dynamic pressure gas foil bearing of the embodiment of the present application has a wedge-shaped structure formed by gradually approaching the supporting bottom shell 1 from the circumferential middle side close to the top foil 3 to the circumferential edge side of the top foil 3 along the circumferential direction. Both circumferential ends of the top foil 3 are set as wedge structures. When the rotor of the rotating machinery where the dynamic pressure gas foil bearing is located rotates forward, a wedge-shaped space is formed between the wedge-shaped structure at one circumferential end of the top foil 3 and the rotor, which can form a dynamic pressure gas film to bear the force of the rotor. When reversal occurs, a wedge-shaped space can also be formed between the wedge-shaped structure at the other circumferential end of the top foil 3 and the rotor, and a dynamic pressure gas film can also be formed to bear the force of the rotor, so that the dynamic pressure gas foil bearing can still maintain its normal working state, and will not be damaged or even destroyed due to the inability to form a dynamic pressure gas film, thereby having reversal adaptability. The dynamic pressure gas foil bearing is provided with more than two corrugated foil support parts 2 and corresponding top foils 3 evenly arranged in the circumference, and a plurality of wedge-shaped spaces evenly distributed along the circumference can be formed between the dynamic pressure gas foil bearing and the rotor of the rotating machinery adopting the dynamic pressure gas foil bearing, thereby facilitating the rapid formation of a stable dynamic pressure gas film around the rotor, so that the dynamic pressure gas foil bearing can quickly form a stable supporting force on the rotor regardless of whether the rotor rotates forward or reverse.

[0092] like Figure 1 and Figure 5As shown, the dynamic pressure gas foil bearing includes two or more corrugated foil support portions 2 evenly arranged along the circumference, and two or more top foils 3 evenly arranged along the circumference and corresponding one-to-one with the multiple corrugated foil support portions 2. The number of corrugated foil support portions 2 and top foils 3 can be, for example, 2, 3, 4, 5, 6, 7, 8, etc.

[0093] like Figures 2 to 4 As shown, in some embodiments of the dynamic pressure gas foil bearing, the corrugated foil support portion 2 is symmetrically arranged with respect to the circumferential direction.

[0094] The corrugated foil support portion 2 is symmetrically arranged relative to the circumference, so that when the rotor of the rotating machinery where the dynamic pressure gas foil bearing is located is reversed, it can bear a force roughly equivalent to that when the rotor rotates forward, thereby making the dynamic pressure gas foil bearing have a strong reversal adaptability.

[0095] like Figures 2 to 4 As shown, in some embodiments of the hydrodynamic gas foil bearing, the corrugated foil support portion 2 includes two corrugated foils 21 symmetrically arranged relative to the circumference, and the corrugated foil 21 is installed on the supporting bottom shell 1, including a first end 21A and a second end 21B oppositely arranged along the circumference, and the second ends 21B of the two corrugated foils 21 are adjacent.

[0096] The corrugated foil support portion 2 includes two corrugated foils 21 symmetrically arranged relative to the circumference, which is beneficial for increasing the performance of the corrugated foil support portion 2, such as the adjustability of ductility and stiffness, by adjusting the relative positions of the two corrugated foils 21.

[0097] like Figures 2 to 4 As shown, in some embodiments of the hydrodynamic gas foil bearing, the corrugated foil 21 has a plurality of parallel and spaced strip-shaped protrusions 211 parallel to the edge of the first end 21A thereof and protruding toward the corresponding top foil 3 .

[0098] The corrugated foil 21 has a plurality of parallel and spaced strip protrusions 211 parallel to the edge of its first end 21A and protruding toward the corresponding top foil 3, so that the corrugated foil 21 has good adaptability, which is beneficial for the corrugated foil 21 to be able to adjust the working gap between the rotor and the dynamic pressure gas foil bearing by changing its own shape at any time, and is beneficial for the uniform distribution of the load-bearing capacity of the dynamic pressure gas foil bearing.

[0099] like Figure 3 and Figure 4 As shown, in some embodiments of the hydrodynamic gas foil bearing, the corrugated foil 21 has an open groove 212 with an opening 2121 located at the second end 21B thereof.

[0100] The corrugated foil 21 has an opening 2121 located at an open groove 212 at its second end 21B, which is conducive to adjusting the local stiffness of the corrugated foil 21 through the open groove 212, so that the corrugated foil 21 can better adapt to the support requirements of the corrugated foil support part 2 for the top foil 31, and thus better adapt to the support requirements of the dynamic pressure gas foil bearing for the rotor in the rotating machinery.

[0101] like Figure 3 and Figure 4 As shown, in some embodiments of the hydrodynamic gas foil bearing, the open groove 212 extends in the circumferential direction.

[0102] The open slots 212 extend in the circumferential direction, which is conducive to adjusting the stiffness of the corrugated foil 21 in the circumferential direction and the radial direction, and adapting to the support requirements of the dynamic pressure gas foil bearing for the rotor in the rotating machinery.

[0103] like Figure 3 and Figure 4 As shown, in some embodiments of the hydrodynamic gas foil bearing, the open groove 212 extends circumferentially to the circumferential middle of the corrugated foil 21 .

[0104] The opening slot 212 extends circumferentially to the circumferential middle of the corrugated foil 21 , which facilitates adjusting the stiffness on both sides of the circumferential middle of the corrugated foil 21 through the opening slot 212 , and is more suitable for the support requirements of the dynamic pressure gas foil bearing for the rotor in the rotating machinery.

[0105] like Figure 3 and Figure 4 As shown, in some embodiments of the hydrodynamic gas foil bearing, the corrugated foil 21 includes two or more open grooves 212 arranged side by side.

[0106] The corrugated foil 21 includes two or more open grooves 212 arranged side by side, which is conducive to more fine adjustment of the stiffness of the corrugated foil 21 along the circumferential direction and radial direction (for hydrodynamic gas foil thrust bearings) or axial direction (for hydrodynamic gas foil thrust bearings) to better adapt to the support requirements of the hydrodynamic gas foil bearings for the rotor in the rotating machinery.

[0107] like Figure 3 and Figure 4 As shown, in some embodiments of the hydrodynamic gas foil bearing, the corrugated foil 21 includes two or more open grooves 212 arranged side by side along the radial direction of the hydrodynamic gas foil bearing, and the extension length of the open grooves 212 of the corrugated foil 21 close to the radial outside is greater than the extension length of the open grooves 212 close to the radial inside.

[0108] The aforementioned configuration of the extension direction and length of the opening slots 212 of the corrugated foil 21 is suitable for a dynamic pressure gas foil thrust bearing. This configuration facilitates finer adjustment of the stiffness of the corrugated foil 21 in both the circumferential and radial directions, thereby better meeting the rotor support requirements of the dynamic pressure gas foil bearing in rotating machinery. For a dynamic pressure gas foil radial bearing, the extension lengths of two or more opening slots 212 can be equal.

[0109] like Figure 3 and Figure 4 As shown, in some embodiments of the hydrodynamic gas foil bearing, the opening groove 212 of the corrugated foil 21 near the radial outer side extends circumferentially to the circumferential middle of the corrugated foil 21, and the end of the opening groove 212 away from its opening 2121 passes over the circumferential center line of the corrugated foil 21; the opening groove 212 of the corrugated foil 21 near the radial inner side extends circumferentially to the circumferential middle of the corrugated foil 21, and the end of the opening groove 212 away from its opening 2121 is spaced from the circumferential center line of the hydrodynamic gas foil bearing.

[0110] The setting of the extension direction and extension length of the opening slot 212 of the corrugated foil 21 is conducive to more precise adjustment of the stiffness of the corrugated foil 21 in the circumferential direction and radial direction, so as to better meet the support requirements of the dynamic pressure gas foil bearing for the rotor in the rotating machinery.

[0111] In some embodiments of the hydrodynamic gas foil bearing, the first end 21A of the corrugated foil 21 is a fixed end fixedly connected to the supporting bottom shell 1 ; the second end 21B of the corrugated foil 21 is a movable end movable relative to the supporting bottom shell 1 .

[0112] The first end 21A and the second end 21B of the corrugated foil 21 are respectively set as a fixed end and a movable end, which is conducive to the stability of the supporting position of the corrugated foil 21. At the same time, it is conducive to the corrugated foil 21 being able to adjust the working gap between the rotor and the dynamic pressure gas foil bearing by changing its own shape at any time, thereby facilitating the uniform distribution of the load-bearing capacity of the dynamic pressure gas foil bearing.

[0113] like Figure 2 and Figure 3 As shown, in the hydrodynamic gas foil bearing of some embodiments, a gap is provided between the second ends 21B of the two corrugated foils 21 .

[0114] There is a gap between the second ends 21B of the two corrugated foils 21, which is conducive to a certain deformation margin at the movable ends of the two corrugated foils 21, so that no interference occurs when the two corrugated foils 21 are deformed, so as to prevent the corrugated foil 21 from being insufficiently deformed due to the interference between the two and affecting the normal adjustment of the working gap between the rotor and the dynamic pressure gas foil bearing, thereby facilitating the uniform distribution of the bearing capacity of the dynamic pressure gas foil bearing, and also preventing the top foil 3 from being restricted in movement during the force process, resulting in local bulging and abnormal wear.

[0115] In the hydrodynamic gas foil bearing of some embodiments, the gap between the second ends 21B of the two corrugated foils 21 is 0.5 mm to 1.5 mm.

[0116] The gap between the second ends 21B of the two corrugated foils 21 is 0.5mm to 1.5mm, which is beneficial for preventing the gap between the second ends 21B of the two corrugated foils 21 from having too much impact on the local stiffness of the corrugated foil support part 2 at the position corresponding to the gap when the two corrugated foils 21 are deformed without interference, thereby facilitating the uniform distribution of the bearing capacity of the dynamic pressure gas foil bearing, and better preventing the top foil 3 from being restricted in movement during the force application process, resulting in local bulging and abnormal wear.

[0117] In the dynamic pressure gas foil bearing of some embodiments, the first end 21A of the corrugated foil 21 is fixed to the supporting bottom shell 1 by spot welding.

[0118] The first end 21A of the corrugated foil 21 is fixed to the supporting bottom shell 1 by spot welding. On the one hand, the relative position of the corrugated foil 21, the supporting bottom shell 1 and the top foil 3 can be stabilized as a whole. On the other hand, the spot welding method has a relatively small effect on the deformation of the corrugated foil 21, which is conducive to preventing the corrugated foil 21 from having a significant impact on its adaptability due to fixing its shape.

[0119] like Figures 1 to 4 As shown, in some embodiments of the dynamic pressure gas foil bearing, the first end 3A of the top foil 3 is a fixed end fixedly connected to the supporting bottom shell 1, and the second end 3B of the top foil 3 is a movable end that is movable relative to the supporting bottom shell 1, or as shown in FIG. Figures 5 and 6 As shown, in some embodiments of the hydrodynamic gas foil bearing, the first end 3A and the second end 3B of the top foil 3 are both movable ends that are movable relative to the supporting bottom shell 1 .

[0120] The first end 3A and the second end 3B of the top foil 3 are respectively configured as a fixed end and a movable end, which is conducive to the stability of the support position of the top foil 3. At the same time, it is conducive to the top foil 3 being able to adjust the working gap between the rotor and the dynamic pressure gas foil bearing by changing its own shape at any time, thereby facilitating the uniform distribution of the load-bearing capacity of the dynamic pressure gas foil bearing. The first end 3A and the second end 3B of the top foil 3 are both movable ends that are movable relative to the supporting bottom shell 1. The dynamic pressure gas foil bearing has a stronger adaptability to changes in load and impact. It is only necessary to limit the top foil 3 radially (for the dynamic pressure gas foil thrust bearing) or axially (for the dynamic pressure gas foil radial bearing). For example, for the dynamic pressure gas foil radial bearing, a limit baffle can be added at both ends of the supporting bottom shell to prevent the top foil from axial displacement, and the production efficiency is higher.

[0121] like Figures 1 to 4 As shown, in some embodiments of the dynamic pressure gas foil bearing, the supporting bottom shell 1 includes a fixed mounting portion 11 and a movable mounting portion 12, the first end 3A of the top foil 3 is a fixed end fixedly connected to the fixed mounting portion 11, and the second end 3B of the top foil 3 is a movable end movably mounted on the movable mounting portion 12. Figures 5 and 6 As shown, in some embodiments of the hydrodynamic gas foil bearing, the supporting bottom shell 1 includes two movable mounting parts 12 , and the first end 3A and the second end 3B of the top foil 3 are movable ends respectively movably mounted on the two movable mounting parts 12 .

[0122] The support base 1 includes a fixed mounting portion 11 and a movable mounting portion 12, respectively connecting the first end 3A and second end 3B of the top foil 3. This facilitates accurate and rapid relative positioning and assembly of the top foil 3 and the support base 1. The first end 3A and second end 3B of the top foil 3 are movable ends, respectively mounted on the two movable mounting portions 12. This allows the dynamic pressure gas foil bearing to better adapt to changes in load and impact, resulting in higher production efficiency.

[0123] like Figure 2 As shown, in some embodiments of the dynamic pressure gas foil bearing, the fixed mounting portion 11 includes a mounting boss 111, and the fixed end of the top foil 3 is connected to the mounting boss 111 by spot welding; and / or as Figure 2 、 Figure 5 and Figure 6 As shown, the movable mounting portion 12 includes a limiting groove 121 , and the movable end of the top foil 3 is inserted into the limiting groove 121 with a movable margin between the movable end and the limiting groove 121 .

[0124] The fixed mounting portion 11 includes a mounting boss 111, and the movable mounting portion 12 includes a limiting groove 121. The top foil 3 and the limiting groove 121 have a movable margin, which is conducive to accurately and quickly determining the relative position of the top foil 3 and the supporting bottom shell 1, and accurately and quickly assembling the top foil 3 and the supporting bottom shell 1. When the fixed mounting portion 11 includes the mounting boss 111, by setting the height of the mounting boss 111, the depth h1 of the wedge-shaped structure of the first end 3A of the top foil 3 can be adjusted, so that the wedge-shaped space formed between the wedge-shaped structure of the first end 3A of the top foil 3 and the rotor has a shape parameter suitable for forming a dynamic pressure film; by fixing the first end 3A of the top foil 3 to the mounting boss 111 by spot welding, the relative position of the top foil 3, the supporting bottom shell 1, and the corrugated foil 21 can be stabilized as a whole, which is conducive to preventing the fixing of the top foil 3 from significantly affecting its overall deformation ability. The movable mounting portion 12 includes a limiting groove 121, which allows the movable end of the top foil 3 to move appropriately under the limiting action of the limiting groove 121, thereby facilitating the guided deformation of the top foil 3 within an appropriate range, thereby facilitating maintaining an appropriate gap range between the dynamic pressure gas foil bearing and the rotor.

[0125] like Figures 1 to 6 As shown, in some embodiments of the hydrodynamic gas foil bearing, there are 5 to 12 radially arranged weld points between the fixed end of the top foil 3 and the mounting boss 111; and / or the angle between the depth direction of the limiting groove 121 and the bearing surface of the top foil bearing area B of the top foil 3 is an obtuse angle; and / or the second end 3B of the top foil 3 and the limiting groove 121 have a movable margin in the thickness direction of the top foil 3 and / or have a movable margin in the length direction of the top foil 3.

[0126] There are an appropriate number of radially arranged welding points between the fixed end of the top foil 3 and the mounting boss 111, which can ensure that the relative positions of the corrugated foil 21 and the supporting bottom shell 1, the top foil 3 and the corrugated foil 2 are generally stable, and the impact on the deformation of the top foil 3 is relatively small, which is conducive to preventing the first end 3A of the top foil 3 from being significantly affected by fixing the top foil 3.

[0127] The angle between the depth direction of the limiting groove 121 and the bearing surface of the top foil bearing area B of the top foil 3 is an obtuse angle, which is beneficial to maintaining the second end 31B in a wedge-shaped structure during the deformation of the top foil 3, so that it can respond at any time to the situation where the rotor of the rotating machinery where the dynamic pressure gas foil bearing is located is reversed.

[0128] The movable end of the top foil 3 and the limiting groove 121 have a movable margin in the thickness direction of the top foil 3 and / or a movable margin in the length direction of the top foil 3. The movable end of the top foil 3 can also be moved appropriately under the limiting action of the limiting groove 121, which is beneficial for the top foil 3 to be guided to deform in the thickness direction and / or length direction of the top foil 3 within an appropriate range, thereby facilitating the maintenance of a suitable gap range between the dynamic pressure gas foil bearing and the rotor.

[0129] like Figure 2 As shown, in some embodiments of the hydrodynamic gas foil bearing, the included angle is 140° to 170°; and / or the installation clearance between the second end 3B of the top foil 3 and the limiting groove 121 in the thickness direction of the top foil 3 is 0.1mm to 0.2mm; and / or the installation clearance between the second end 3B of the top foil 3 and the limiting groove 121 in the length direction of the top foil 3 is 0.1mm to 0.2mm.

[0130] The above-mentioned limitation on the angle range facilitates maintaining the wedge-shaped structure of the second end 31B in an appropriate shape during deformation of the top foil 3, thereby readily responding to rotor reversal in the rotating machinery in which the dynamic pressure gas foil bearing is located, and more stably withstanding the forces acting on the rotor during rotor reversal. The above-mentioned limitation on the installation gap range allows the movable end of the top foil 3 to move appropriately within the limited range under the limiting action of the limiting groove 121, facilitating guided and limited deformation of the top foil 3 in the thickness direction and / or length direction of the top foil 3 within an appropriate range, thereby facilitating the maintenance of an appropriate gap range between the dynamic pressure gas foil bearing and the rotor.

[0131] like Figure 2 As shown, in some embodiments of the hydrodynamic gas foil bearing, the depth h1 of the wedge-shaped structure of the first end 3A of the top foil 3 is smaller than the depth h2 of the wedge-shaped structure of the second end 3B of the top foil 3 .

[0132] The above numerical ranges of h1 and h2 and the relationship between the numerical values ​​of h1 and h2 are conducive to ensuring that the load-bearing capacity of the dynamic pressure gas foil bearing does not significantly decrease when the rotor of a rotating machinery using the dynamic pressure gas foil bearing reverses.

[0133] In some embodiments of the hydrodynamic gas foil bearing, 0.05 mm ≤ h1 ≤ mm0.2; and / or 0.05 mm ≤ h2 ≤ mm0.2; and / or 0.05 mm ≤ h2 - h1 ≤ 0.2 mm.

[0134] The above numerical ranges of h1 and h2 and the relationship between the numerical values ​​of h1 and h2 are conducive to ensuring that the load-bearing capacity of the dynamic pressure gas foil bearing is maintained at a high level when the rotor of a rotating machinery using the dynamic pressure gas foil bearing reverses.

[0135] In some embodiments of the hydrodynamic gas foil bearing, such as Figures 1 to 4 As shown, the dynamic pressure gas foil bearing is a dynamic pressure gas foil thrust bearing; or as Figures 5 and 6 As shown, the dynamic pressure gas foil bearing is a dynamic pressure gas foil radial bearing.

[0136] The hydrodynamic gas foil bearing is a hydrodynamic gas foil thrust bearing or a hydrodynamic gas foil radial bearing. When the rotor of a rotating machine using the hydrodynamic gas foil bearing reverses, the hydrodynamic gas foil bearing provides a stable axial load-bearing capacity or radial load-bearing capacity for the rotor without causing damage to the hydrodynamic gas foil bearing.

[0137] A second aspect of the present application provides a rotating machine comprising the hydrodynamic gas foil bearing of the first aspect of the present application. Examples of the rotating machine include a centrifugal compressor, a blower, and the like. The hydrodynamic gas foil bearing included in the rotating machine may be, for example, a hydrodynamic gas foil thrust bearing, a hydrodynamic gas foil radial bearing, or both.

[0138] The rotating machine according to the embodiment of the present application has the advantages of the dynamic pressure gas foil bearing according to the embodiment of the present application.

[0139] The following combination Figures 1 to 4 , taking the dynamic pressure gas foil thrust bearing as an example, the dynamic pressure gas foil bearing of the embodiment of the present application is described in more detail. Figure 1 Schematic diagram of the structure of a dynamic pressure gas foil bearing according to one embodiment of the present application. Figure 2 This is a partial structural schematic diagram of a dynamic pressure gas foil bearing according to an embodiment of the present application, showing a top foil, a corrugated foil support portion corresponding to the top foil, and a corresponding partial support bottom shell. Figure 3 Schematic diagram of the structure of the corrugated foil support portion of the dynamic pressure gas foil bearing according to one embodiment of the present application. Figure 4 This is a schematic structural diagram of the corrugated foil of the corrugated foil support portion of the dynamic pressure gas foil bearing according to an embodiment of the present application.

[0140] like Figures 1 to 4 As shown, the dynamic pressure gas foil bearing includes a supporting bottom shell 1, six corrugated foil support parts 2, and six top foils 3 arranged one-to-one corresponding to the corrugated foil support parts 2. The corrugated foil support parts 2 and the top foils 3 each form a fan-shaped structure as a whole.

[0141] The dynamic pressure gas foil bearing is opposed to the thrust plate of the rotor of the rotary machine. Figure 2 In the embodiment, the top foil bearing area B bears the main bearing function, and a wedge-shaped space is formed between the top foil bearing area B and the end surface of the thrust plate.

[0142] In an embodiment not shown, the number of the corrugated foil support portions 2 and the top foil 3 can be adjusted according to the size of the load-bearing area of ​​the dynamic pressure gas foil bearing.

[0143] The corrugated foil support portion 2 is arranged on one side of the supporting bottom shell 1. The corrugated foil support portion 2 includes two corrugated foils 21 symmetrically arranged relative to the circumference. Each corrugated foil 21 is also formed into a fan-shaped structure as a whole. The corrugated foil 21 is installed on the supporting bottom shell 1, and includes a first end 21A and a second end 21B arranged opposite to each other along the circumference. The first end 21A of the corrugated foil 21 is a fixed end fixedly connected to the supporting bottom shell 1, and the second end 21B of the corrugated foil 21 is a movable end movable relative to the supporting bottom shell 1. The second ends 21B of the two corrugated foils 21 are adjacent. The first end 21A of the corrugated foil 21 is fixed to the supporting bottom shell 1 by spot welding. That is, the first ends 21A of the two corrugated foils 21 are welded to the same side of the limiting groove 121 and the mounting boss 111 of the supporting bottom shell 1 by spot welding. The number of welding points on each side is generally controlled to be between 5 and 12. The number of welding points can be set according to the diameter of the dynamic pressure gas foil bearing. In this embodiment, the multiple welding points of each corrugated foil 21 are evenly arranged along the radial direction of the dynamic pressure gas foil bearing, and the number of the welding points is, for example, 7.

[0144] There is a gap between the second ends 21B of the two corrugated foils 21. The gap between the second ends 21B of the two corrugated foils 21 is 0.5 mm to 1.5 mm. In this embodiment, the gap is, for example, 1.0 mm.

[0145] The corrugated foil 21 has a plurality of parallel and spaced strip-shaped protrusions 211 parallel to the edge of the first end 21A thereof and protruding toward the corresponding top foil 3 .

[0146] Each corrugated foil 21 has two openings 2121 located at its second end 21B, and two open slots 212 are arranged side by side in the radial direction of the dynamic pressure gas foil bearing. The extended length of the open slots 212 near the radial outer side of the corrugated foil 21 is greater than the extended length of the open slots 212 near the radial inner side. The open slots 212 near the radial outer side of the corrugated foil 21 extend circumferentially to the circumferential center of the corrugated foil 21, and the end of the open slots 212 away from the openings 2121 of the corrugated foil 21 passes over the circumferential centerline of the corrugated foil 21. The open slots 212 near the radial inner side of the corrugated foil 21 extend circumferentially to the circumferential center of the corrugated foil 21, and the end of the open slots 212 away from the openings 2121 of the corrugated foil 21 is spaced from the circumferential centerline of the dynamic pressure gas foil bearing.

[0147] The top foil 3 is positioned on the side of the corrugated foil support portion 2, away from the support base 1, and is mounted on the support base 1. The top foil 3 includes a first end 3A and a second end 3B, which are positioned opposite each other along the circumference of the dynamic pressure gas foil bearing. The first end 3A and the second end 3B of the top foil 3 each gradually approach the support base 1 along the circumferential direction, from near the circumferential center of the top foil 3 toward the circumferential edge of the top foil 3, forming a wedge-shaped structure. The first end 3A of the top foil 3 is the fixed end fixedly connected to the support base 1.

[0148] Second end 3B of top foil 3 is a movable end that is movable relative to support base 1. Support base 1 includes fixed mounting portion 11 and movable mounting portion 12. First end 3A of top foil 3 is fixedly connected to fixed mounting portion 11. Second end 3B of top foil 3 is movably mounted to movable mounting portion 12.

[0149] The fixed mounting portion 11 includes a mounting boss 111, and the first end 3A of the top foil 3 is connected to the mounting boss 111 by spot welding. There are 5 to 12 radially arranged welding spots between the first end 3A of the top foil 3 and the mounting boss 111. For example, Figures 1 to 4 In the embodiment shown, the number of welding spots S is 7.

[0150] The movable mounting portion 12 includes a retaining groove 121, into which the second end 3B of the top foil 3 is inserted. The second end 3B of the top foil 3 and the retaining groove 121 have a clearance in both the thickness and length directions of the top foil 3. The installation clearance between the second end 3B of the top foil 3 and the retaining groove 121 in the thickness direction of the top foil 3 is 0.1 mm to 0.2 mm, for example, 0.15 mm. The installation clearance between the second end 3B of the top foil 3 and the retaining groove 121 in the length direction of the top foil 3 is 0.1 mm to 0.2 mm, for example, 0.15 mm.

[0151] The included angle A between the depth direction of the limiting groove 121 and the radial direction of the dynamic pressure gas foil bearing, which is close to the radial inner side, is an obtuse angle. The included angle A is, for example, 140° to 170°, and in this embodiment, is, for example, 160°.

[0152] like Figure 2As shown, the normal rotor rotation direction R of the rotor supported by the dynamic pressure gas foil bearing is from the mounting boss 111 to the direction of the limiting groove 121. The depth h1 of the wedge-shaped structure of the first end 3A of the top foil 3 is less than the depth h2 of the wedge-shaped structure of the second end 3B of the top foil 3. The depth h1 of the wedge-shaped structure of the first end 3A of the top foil 3 is achieved by controlling the height difference between the mounting boss 111 and the corrugated foil 21. In some embodiments of the dynamic pressure gas foil bearing, 0.05mm≤h1≤mm0.2. The depth h1 is within a suitable range. On the one hand, it prevents the depth h1 from being too small, which will improve the load-bearing capacity of the dynamic pressure gas foil bearing to a certain extent, but requires a sacrifice in production efficiency and cost. On the other hand, it prevents the depth h1 from being too large, which will cause the load-bearing capacity of the dynamic pressure gas foil bearing to drop sharply, affecting the reliability of the dynamic pressure gas foil bearing. The depth h2 of the wedge-shaped structure at second end 3B of top foil 3 can be in the range of 0.05 mm ≤ h2 ≤ mm0.2, and 0.05 mm ≤ h2 - h1 ≤ mm0.2, to ensure that the dynamic pressure gas foil bearing's load-bearing characteristics are not significantly weakened during reverse rotation of the rotor. In this embodiment, h1 is 0.1 mm, h2 is 0.15 mm, and h2 - h1 is 0.05 mm.

[0153] The following combination Figures 5 and 6 , taking the dynamic pressure gas foil radial bearing as an example, the dynamic pressure gas foil bearing of the embodiment of the present application is described.

[0154] like Figure 5 and Figure 6 As shown, the support bottom shell 1 of the dynamic pressure gas foil radial bearing is cylindrical, which is different from Figures 1 to 4 The disc-shaped support bottom shell 1 in the center. The dynamic pressure gas foil radial bearing includes four top foils 3 evenly distributed along the circumference and corrugated foil support portions (not shown) corresponding to the four top foils 3. The first end 3A and the second end 3B of the top foil 3 are both movable ends. The support bottom shell 1 is provided with two movable mounting portions corresponding to each top foil 3, and each movable mounting portion includes a limiting groove 121. The first end 3A and the second end 3B of each top foil 3 are respectively inserted into the limiting grooves 121 of the two corresponding movable mounting portions.

[0155] Figure 5 and Figure 6 For any part not described in the foregoing, please refer to the corresponding descriptions in the foregoing embodiments and Figures 1 to 4 Related description in .

[0156] The embodiment of the present application provides a dynamic pressure gas foil thrust bearing with reverse adaptability based on the working characteristics of the dynamic pressure gas foil bearing. In the dynamic pressure gas foil thrust bearing of this embodiment, by adopting a corrugated foil support portion 2 as a load-bearing corrugated foil group with two corrugated foils 21 arranged opposite each other, and the fixed end and the movable end of the top foil 3 are configured as a double-ended wedge structure, it is conducive to meeting the requirement that when the rotor of the rotating machinery reverses under extreme operating conditions, the dynamic pressure gas foil thrust bearing can still maintain the normal working state of the rotating machinery. Regardless of whether the supported rotor rotates in the normal direction, that is, the rotor rotation direction R or the reverse direction, the dynamic pressure gas foil thrust bearing can maintain the normal working state, thereby having the ability to prevent reverse rotation. This is conducive to solving the problem of abnormal shutdown of rotating machinery such as compressors or blowers under high load operation and urgent rapid load reduction shutdown. Because the high-pressure side pressure cannot be quickly unloaded, the rotor is very likely to reverse under the action of high pressure difference when the power source is lost.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solutions requested for protection in this application.

Claims

1. A dynamic pressure gas foil bearing, characterized in that: include: Supporting bottom shell (1); Two or more corrugated foil support parts (2) are provided on one side of the support bottom shell (1) and are evenly arranged along the circumference of the dynamic pressure gas foil bearing; and Two or more top foils (3) are arranged on a side of the corrugated foil support portion (2) away from the supporting bottom shell (1), are evenly arranged along the circumference and correspond one-to-one to the two or more corrugated foil support portions (2), and the top foil (3) is installed on the supporting bottom shell (1), including a first end (3A) and a second end (3B) arranged opposite to each other along the circumference, and the first end (3A) and the second end (3B) of the top foil (3) are respectively gradually approaching the supporting bottom shell (1) along the circumference from a side close to the circumferential middle of the top foil (3) to a side close to the circumferential edge of the top foil (3), thereby forming a wedge-shaped structure.

2. The dynamic pressure gas foil bearing according to claim 1, characterized in that: The corrugated foil support portion (2) is arranged symmetrically with respect to the circumferential direction.

3. The dynamic pressure gas foil bearing according to claim 2, characterized in that: The corrugated foil support portion (2) comprises two corrugated foils (21) symmetrically arranged relative to the circumference; the corrugated foils (21) are mounted on the supporting bottom shell (1) and comprise a first end (21A) and a second end (21B) arranged opposite to each other along the circumference; the second ends (21B) of the two corrugated foils (21) are adjacent to each other.

4. The dynamic pressure gas foil bearing according to claim 3, characterized in that: The corrugated foil (21) has a plurality of parallel and spaced strip-shaped protrusions (211) parallel to the edge of the first end (21A) thereof and protruding toward the corresponding top foil (3).

5. The dynamic pressure gas foil bearing according to claim 3, characterized in that: The corrugated foil (21) has an opening slot (212) with an opening (2121) located at the second end (21B) thereof.

6. The dynamic pressure gas foil bearing according to claim 5, characterized in that: The opening groove (212) extends along the circumferential direction.

7. The dynamic pressure gas foil bearing according to claim 6, characterized in that: The opening groove (212) extends along the circumferential direction to the circumferential middle of the corrugated foil (21).

8. The dynamic pressure gas foil bearing according to claim 6, characterized in that: The corrugated foil (21) comprises two or more opening slots (212) arranged side by side.

9. The dynamic pressure gas foil bearing according to claim 8, characterized in that: The corrugated foil (21) comprises two or more opening grooves (212) arranged side by side in a radial direction of the dynamic pressure gas foil bearing, and the extension length of the opening groove (212) close to the radial outer side of the corrugated foil (21) is greater than the extension length of the opening groove (212) close to the radial inner side.

10. The dynamic pressure gas foil bearing according to claim 9, characterized in that: The opening groove (212) close to the radial outer side of the corrugated foil (21) extends along the circumferential direction to the circumferential middle of the corrugated foil (21), and an end of the opening groove (212) away from the opening (2121) thereof passes over the circumferential center line of the corrugated foil (21); The opening groove (212) close to the radial inner side of the corrugated foil (21) extends along the circumferential direction to the circumferential middle of the corrugated foil (21), and an end of the opening groove (212) away from its opening (2121) is spaced from the circumferential center line of the dynamic pressure gas foil bearing.

11. The dynamic pressure gas foil bearing according to claim 3, characterized in that: The first end (21A) of the corrugated foil (21) is a fixed end fixedly connected to the supporting bottom shell (1); The second end (21B) of the corrugated foil (21) is a movable end that is movable relative to the supporting bottom shell (1).

12. The dynamic pressure gas foil bearing according to claim 11, characterized in that: There is a gap between the second ends (21B) of the two corrugated foils (21).

13. The dynamic pressure gas foil bearing according to claim 12, characterized in that: The gap between the second ends (21B) of the two corrugated foils (21) is 0.5 mm to 1.5 mm.

14. The dynamic pressure gas foil bearing according to claim 11, characterized in that: The first end (21A) of the corrugated foil (21) is fixed to the supporting bottom shell (1) by spot welding.

15. The dynamic pressure gas foil bearing according to any one of claims 1 to 14, characterized in that: The first end (3A) of the top foil (3) is a fixed end fixedly connected to the supporting bottom shell (1), and the second end (3B) of the top foil (3) is a movable end movable relative to the supporting bottom shell (1); or The first end (3A) and the second end (3B) of the top foil (3) are both movable ends that are movable relative to the supporting bottom shell (1).

16. The dynamic pressure gas foil bearing according to claim 15, characterized in that: The supporting bottom shell (1) comprises a fixed mounting portion (11) and a movable mounting portion (12), the first end (3A) of the top foil (3) is a fixed end fixedly connected to the fixed mounting portion (11), and the second end (3B) of the top foil (3) is a movable end movably mounted on the movable mounting portion (12); or The supporting bottom shell (1) comprises two movable mounting parts (12), and the first end (3A) and the second end (3B) of the top foil (3) are movable ends respectively movably mounted on the two movable mounting parts (12).

17. The dynamic pressure gas foil bearing according to claim 16, characterized in that: The fixed mounting portion (11) comprises a mounting boss (111), and the fixed end of the top foil (3) is connected to the mounting boss (111) by spot welding; and / or The movable mounting portion (12) comprises a limiting groove (121), and the movable end of the top foil (3) is inserted into the limiting groove (121), and has a movable margin with the limiting groove (121).

18. The dynamic pressure gas foil bearing according to claim 17, characterized in that: There are 5 to 12 welding points arranged along the radial direction of the dynamic pressure gas foil bearing between the fixed end of the top foil (3) and the mounting boss (111); and / or The angle between the depth direction of the limiting groove (121) and the bearing surface of the top foil bearing area (B) of the top foil (3) is an obtuse angle; and / or The movable end of the top foil (3) and the limiting groove (121) have the movable margin in the thickness direction of the top foil (3) and / or have the movable margin in the length direction of the top foil (3).

19. The dynamic pressure gas foil bearing according to claim 18, characterized in that: The angle is 140° to 170°; and / or The installation gap between the movable end of the top foil (3) and the limiting groove (121) in the thickness direction of the top foil (3) is 0.1 mm to 0.2 mm; and / or The installation gap between the movable end of the top foil (3) and the limiting groove (121) in the length direction of the top foil (3) is 0.1 mm to 0.2 mm.

20. The dynamic pressure gas foil bearing according to any one of claims 1 to 14, characterized in that: The depth h1 of the wedge-shaped structure at the first end (3A) of the top foil (3) is smaller than the depth h2 of the wedge-shaped structure at the second end (3B) of the top foil (3).

21. The dynamic pressure gas foil bearing according to claim 20, characterized in that: 0.05mm≤h1≤0.2mm; and / or 0.05mm≤h2≤0.2mm; and / or 0.05mm≤h2-h1≤0.2mm.

22. The dynamic pressure gas foil bearing according to any one of claims 1 to 14, characterized in that: The dynamic pressure gas foil bearing is a dynamic pressure gas foil thrust bearing; or The dynamic pressure gas foil bearing is a dynamic pressure gas foil radial bearing.

23. A rotating machine, characterized in that: A dynamic pressure gas foil bearing comprising the one of claims 1 to 22.

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