Dynamic pressure gas foil bearing and rotating machine

Abstract

The invention relates to a dynamic pressure gas foil bearing and a rotating machine, in the dynamic pressure gas foil bearing, a supporting bottom plate comprises a plate body and a plurality of supporting tables, the multiple supporting tables are fixed to one side of the plate body at intervals in the circumferential direction of the plate body, and all the supporting tables are arranged in a protruding mode relative to the plate body; the top-layer foil is installed on the side, away from the plate body, of the supporting table, the top-layer foil is of an integrated annular structure, the top-layer foil comprises a plurality of bearing parts which are in one-to-one correspondence with the elastic supporting foils, and any bearing part comprises a first end and a second end which are oppositely arranged in the circumferential direction; the first end and the second end are gradually close to the supporting bottom plate in the circumferential direction from the side close to the circumferential middle of the bearing part to the side close to the circumferential edge of the bearing part to form a wedge-shaped structure. An elastic supporting foil is arranged between any two adjacent supporting tables, and in the circumferential direction, the middle of each elastic supporting foil protrudes relative to the supporting tables on the two sides of the elastic supporting foil in the thickness direction of the plate body. The dynamic pressure gas foil bearing has the anti-reverse capability.

Description

Technical Field

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

[0002] Hydrodynamic gas foil bearings utilize the wedge-shaped space formed between the rotor carrier plate and the bearing surface to create a wedge effect. As the rotor speed increases, the surrounding gas is continuously dragged into the wedge-shaped space formed between the rotor and bearings due to the viscosity of the gas. As the air pressure in the wedge-shaped space continues to rise, a hydrodynamic air film forms when the bearing speed reaches a certain value, and the bearing enters a stable gas lubrication state. Under the hydrodynamic effect, the higher the speed, the higher the bearing's load capacity. By utilizing the gas film formed to bear the load, friction can be greatly reduced. Compared to other types of bearings, gas bearings have many advantages, such as being oil-free and pollution-free, with low operating resistance, a simple structure, and low mechanical loss. Gas bearing technology overcomes many of the shortcomings of traditional liquid bearings, sliding bearings, and rolling bearings, and has been widely used in high-speed rotating machinery and precision processing machinery, especially in food, brewing, data centers, and other usage scenarios. Under the requirements of energy conservation, emission reduction, and the new environmental protection situation, hydrodynamic air bearings have a huge market and promising application prospects.

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

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

[0005] The present application provides a dynamic pressure gas foil bearing and a rotating machine to solve the problem that the dynamic pressure gas foil bearings in the related art generally do not have anti-reversal capability.

[0006] In a first aspect, the present application provides a dynamic pressure gas foil bearing, which includes a support base plate, a top foil and a plurality of elastic support foils, wherein:

[0007] The support base plate includes a plate body and a plurality of support platforms, wherein the plurality of support platforms are fixed to one side of the plate body at intervals along the circumference of the plate body, and each support platform is protruded relative to the plate body;

[0008] The top foil is mounted on a side of the support platform facing away from the plate body, the top foil is an integrated annular structure, and the top foil includes a plurality of bearing portions, the plurality of bearing portions corresponding one to one with the plurality of elastic support foils, and each of the bearing portions includes a first end and a second end oppositely arranged along the circumferential direction, the first end and the second end respectively gradually approaching the support base along the circumferential direction from a side close to the circumferential middle portion of the bearing portion to a side close to the circumferential edge of the bearing portion, thereby forming a wedge-shaped structure;

[0009] The elastic support foil is provided between any two adjacent support platforms. In the circumferential direction, the middle portion of the elastic support foil is protruded relative to the support platforms on both sides thereof along the thickness direction of the plate body.

[0010] In a second aspect, the present application provides a rotating machine comprising the above-mentioned hydrodynamic gas foil bearing.

[0011] The above-mentioned technical solution provided by the embodiment of the present application can provide a good supporting effect when the rotor reverses. In detail, in the supporting base plate of the dynamic pressure gas foil bearing, multiple support platforms are fixed on one side of the plate body at intervals along the circumference of the plate body, and each of the support platforms is protruded relative to the plate body, so that an elastic support foil can be set between any adjacent support platforms; and the middle part of the elastic support foil is protruded relative to the support platforms on both sides along the thickness direction of the plate body, so that the elastic support foil can normally provide elastic ability by extruding downward; at the same time, the top foil is installed on the side of the support platform away from the plate body, and the top foil includes multiple bearing parts, and the multiple bearing parts correspond to the multiple elastic support foils one by one, so that the two can jointly provide elastic effect for the area where they are located; the bearing part is formed with a wedge-shaped structure, so that the bearing part and the corresponding elastic support foil can both provide elastic effect, which makes the overall pressure-bearing capacity of the dynamic pressure gas foil bearing relatively strong. At the same time, the top foil is an integrated annular structure, which allows any position on the circumference of the top foil to transfer the aforementioned extrusion effect to the areas on both sides of the circumference when it is squeezed, thereby improving the pressure-bearing reliability of the entire top foil.

[0012] In addition, since the first and second ends of any bearing part, which are opposite to each other along the circumferential direction, gradually approach the supporting base plate along the circumferential direction from the side close to the circumferential middle of the bearing part to the side of the circumferential edge of the bearing part to form a wedge-shaped structure, both circumferential ends of the bearing part are set as wedge-shaped structures. Therefore, when the rotor of the rotating machinery where the dynamic pressure gas foil bearing is located rotates forward, the wedge-shaped structure at one circumferential end of the bearing part can form a wedge-shaped space with the rotor, thereby forming a dynamic pressure gas film and bearing the force of the rotor. Correspondingly, when the rotor reverses, a wedge-shaped space can also be formed between the wedge-shaped structure at the other circumferential end of the bearing part and the rotor, thereby forming a dynamic pressure gas film and bearing 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. This makes the dynamic pressure gas foil bearing disclosed in the embodiment of the present application have reversal adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0015] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0016] Figure 1 A schematic structural diagram of a dynamic pressure gas foil bearing provided in an embodiment of the present application;

[0017] Figure 2 An exploded schematic diagram of a dynamic pressure gas foil bearing provided in an embodiment of the present application;

[0018] Figure 3 A schematic structural diagram of a support base plate in a dynamic pressure gas foil bearing provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of the structure of the top foil in the dynamic pressure gas foil bearing provided in an embodiment of the present application;

[0020] Figure 5A schematic diagram of the assembly between the elastic support foil and the support base plate in the dynamic pressure gas foil bearing provided in an embodiment of the present application;

[0021] Figure 6 A schematic cross-sectional view of a hydrodynamic gas foil bearing according to an embodiment of the present application.

[0022] Description of reference numerals:

[0023] 1. Support base; 11. Plate body; 12. Support platform; 13. Through hole;

[0024] 2. Top foil; 21. Load-bearing portion; 211. Load-bearing area; 212. Wedge-shaped area; 22. Transition portion; 23. Through hole;

[0025] 3. Elastic supporting foil; 31. Elastic protrusion; 32. Assembly flat plate; 33. Matching flat plate;

[0026] 4. Vibration-damping plate;

[0027] 5. Loading plate; 51. Loading sheet; 52. Connecting portion;

[0028] W-weld point. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0031] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0032] In order to solve the problem in the prior art that the rotor reversal causes the bearing to generate dynamic pressure gas because it cannot form a dynamic pressure gas film, thereby causing damage or even destruction of the foil bearing, such as Figures 1-6 As shown, the present application provides a dynamic pressure gas foil bearing, which can provide approximately the same force when the rotor rotates forward and reverse, ensuring that the dynamic pressure gas foil bearing has strong reversal adaptability.

[0033] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a dynamic pressure gas foil bearing, comprising a supporting base plate 1, a top foil 2 and a plurality of elastic support foils 3, wherein the number of elastic support foils 3 is specifically two or more, and preferably, the number of elastic support foils 3 can be greater than three.

[0034] Among them, Figure 2 and Figure 5 As shown, in the embodiment of the present application, the support base plate 1 includes a plate body 11 and a plurality of support platforms 12. The plurality of support platforms 12 are fixed to one side of the plate body 11 at intervals along the circumference of the plate body 11, and each support platform 12 is arranged to protrude relative to the plate body 11. That is, in the dynamic pressure gas foil bearing provided in the embodiment of the present application, accommodating grooves can be formed between the plurality of support platforms 12 of the support base plate 1, and the number of accommodating grooves is the same as the number of support platforms 12. In other words, in the embodiment of the present application, along the circumference of the plate body 11, an accommodating groove is formed between any two adjacent support platforms 12 by cooperating with the plate body 11, and the accommodating groove is used to accommodate the elastic support foil 3.

[0035] More specifically, the plate body 11 and the plurality of support platforms 12 can be formed in an integrally formed manner, which makes the connection reliability between any support platform 12 and the plate body 11 relatively high. The plate body 11 can be a circular annular structure. In a specific embodiment of the present application, the number of support platforms 12 can be 6. Of course, in other embodiments, the number of support platforms 12 can also be other values, which is not limited in this document. In addition, the shape and size of any support platform 12 can be the same, and the angle between any two adjacent support platforms 12 in the circumferential direction of the plate body 11 can also be the same. This facilitates the processing and installation of the elastic support foil 3 and can, to a certain extent, improve the pressure uniformity of the entire dynamic pressure gas foil bearing in the circumferential direction, thereby improving the reliability and service life of the dynamic pressure gas foil bearing.

[0036] It should be noted that, in order to improve the assembly stability between the elastic support foil 3 and the top foil 2 and the supporting base plate 1, and to enhance the overall elastic support effect of the elastic support foil 3 and the top foil 2, the bottom of the accommodating groove and the surface of the support platform 12 facing away from the plate body 11 are both flat and perpendicular to the thickness direction of the plate body 11. Furthermore, the bottoms of the multiple accommodating grooves can be located in the same plane, and the surfaces of the multiple support platforms 12 facing away from the plate body 11 can also be located in the same plane. This can reduce the overall processing difficulty of the top foil 2 and can make the structures and dimensions of the multiple elastic support foils 3 correspond to each other. This can further reduce the processing and assembly difficulty of the multiple elastic support foils 3 and further enhance the pressure uniformity of the entire dynamic pressure gas foil bearing in the circumferential direction.

[0037] During assembly of the hydrodynamic gas foil bearing, the top foil 2 is mounted on the side of the support platform 12 facing away from the plate 11. In the embodiment of the present application, the top foil 2 is a one-piece annular structure, which makes the overall processing of the top foil 2 relatively simple. Specifically, the top foil 2 can be formed by stamping. Because the top foil 2 is a one-piece annular structure, the elastic extrusion effect received by different positions of the top foil 2 in the circumferential direction of the plate 11 can be transmitted to both sides of the circumference. This can increase the upper pressure limit of each circumferential position in the hydrodynamic gas foil bearing, thereby further improving the reliability of the entire hydrodynamic gas foil bearing.

[0038] Of course, in order to ensure that the top foil 2 has good elastic extrusion ability, in an embodiment of the present application, the top foil 2 includes multiple bearing parts 21, and the multiple bearing parts 21 are arranged in sequence. Optionally, among the multiple bearing parts 21, any two adjacent bearing parts 21 can be directly connected, or, in other embodiments of the present application, any two adjacent bearing parts 21 can be indirectly connected to each other through other structures to form a ring structure of the top foil 2.

[0039] At the same time, the multiple bearing portions 21 correspond one-to-one with the multiple elastic support foils 3, allowing the dynamic pressure gas foil bearing to utilize both the bearing portions 21 and the elastic support foils 3 to provide elasticity, ensuring a relatively good overall elastic effect. Furthermore, the wedge-shaped structure of the bearing portions 21 makes the dynamic pressure gas foil bearing reversible.

[0040] In detail, any bearing portion 21 includes a first end and a second end that are arranged opposite to each other along the circumferential direction, and the first end and the second end are respectively arranged along the circumferential direction from the side close to the circumferential middle of the bearing portion 21 to the side of the circumferential edge of the bearing portion 21, gradually approaching the supporting base plate 1 to form a wedge-shaped structure. It should be noted that in the embodiment of the present application, as described above, the top foil 2 is an integrated annular structure. Therefore, the top foil 2 objectively does not have a free end. In order to facilitate the description of the specific structure of the top foil 2, the present application regards the top foil 2 as including multiple independent bearing portions 21, and any bearing portion 21 has a first end and a second end that are opposite to each other along the above-mentioned circumferential direction. In the actual structure, any two adjacent bearing portions 21 in the top foil 2 are in a state of being connected to each other.

[0041] When the above structure is adopted, both circumferential ends of the bearing part 21 are set as wedge-shaped structures. When the rotor of the rotating machinery where the dynamic pressure gas foil bearing is located rotates forward, a wedge-shaped space is formed between the wedge-shaped structure at one circumferential end of the bearing part 21 and the rotor, which can form a dynamic pressure gas film and 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 bearing part 21 and the rotor, which can also form a dynamic pressure gas film and 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 due to rotor reversal, thereby making the dynamic pressure gas foil bearing have reversal adaptability.

[0042] As described above, the dynamic pressure gas foil bearing includes a plurality of elastic support foils 3. Specifically, an elastic support foil 3 is provided between any two adjacent support platforms 12, that is, the elastic support foil 3 is installed in the receiving groove formed between the adjacent support platforms 12. At the same time, in order to ensure that the elastic support foil 3 has relatively good positional stability during the elastic deformation process and after the elastic deformation is restored, in the dynamic pressure gas foil bearing disclosed in the embodiment of the present application, the size of the elastic support foil 3 can be correspondingly designed according to parameters such as the circumferential spacing between adjacent support platforms 12, so that the elastic support foil 3 can form a relatively good and stable assembly relationship with the support base plate 1.

[0043] At the same time, in order to ensure that the elastic support foil 3 has the ability to withstand elastic extrusion, during the process of forming the elastic support foil 3, by designing its shape and size, the middle portion of the elastic support foil 3 can be arranged to protrude relative to the support platforms 12 on both sides thereof along the thickness direction of the plate body 11. That is, the middle portion of the elastic support foil 3 can extend outside the accommodating groove, ensuring that the elastic support foil 3 can provide an elastic effect by being squeezed against the top foil 2 and other structures. Specifically, the size of the elastic support foil 3 protruding from the support platform 12 can be determined based on the overall size of the dynamic pressure gas foil bearing. Generally, the distance between the middle portion of the elastic support foil 3 and the surface of the support platform 12 facing away from the plate body 11 can be between 0.03-0.15 mm. More specifically, the aforementioned distance can be between 0.05-0.1 mm. This can ensure that the dynamic pressure gas foil bearing has a relatively good air film structure and can minimize the probability of plastic deformation of the elastic support foil 3.

[0044] In order to further improve the stability of the relative position relationship between the elastic support foil 3 and the supporting base plate 1, in a specific embodiment of the present application, one end of any elastic support foil 3 can be fixedly connected to the plate body 11 in the circumferential direction of the plate body 11.

[0045] Specifically, the elastic support foil 3 can be fixedly connected to the plate body 11 through connecting parts, etc. In other embodiments of the present application, the elastic support foil 3 and the supporting base plate 1 can both be formed of materials such as metal. In this case, the elastic support foil 3 and the plate body 11 can also be formed into a more reliable fixed connection relationship through welding, etc.

[0046] At the same time, the other end of the elastic support foil 3 in the circumferential direction can be a free end. In this case, the elastic support foil 3 has a relatively strong elastic deformation capability. Of course, in order to ensure that the elastic support foil 3 can deform by expanding toward the end where its free end is located, in the embodiment of the present application, the free end of the elastic support foil 3 needs to be spaced apart from the adjacent support platform 12 in the aforementioned circumferential direction to reserve space for the elastic support foil 3 to expand and deform. Specifically, the actual size of the aforementioned spacing can be determined according to the specific situation, and the end of the elastic support foil 3 fixed to the plate body 11 and the other adjacent support platform 12 can also be spaced apart in the aforementioned circumferential direction, which can reduce the difficulty of fixing the elastic support foil 3 to the plate body 11.

[0047] Correspondingly, the top foil 2 also needs to form an assembly relationship with the support base 1 so that the relative position between the two can be limited, thereby ensuring that the top foil 2 can absorb the impact force by elastically deforming and squeezing against the support base 1. Optionally, other structures can be provided between the bearing parts 21 in the top foil 2. In this case, the aforementioned other structures can be fixedly connected to the corresponding support platform 12, or, when the bearing parts 21 are directly connected, the connection area between the bearing parts 21 can also be fixedly connected to the support platform 12. In another embodiment of the present application, the top foil 2 and the support base 1 can also be connected to each other using structures such as pins. In this case, by controlling the limit range of the pins, the relative movement range of the top foil 2 and the support base 1 can be limited in the thickness direction of the support base 1 to prevent the two from loosening and separating, and to prevent the connection relationship between the top foil 2 and the support base 1 from weakening the elastic support foil 3 and the elastic capacity of the top foil 2.

[0048] The above-mentioned technical solution provided by the embodiment of the present application can provide a good support effect when the rotor reverses. In detail, in the support base plate 1 of the dynamic pressure gas foil bearing, multiple support platforms 12 are fixed on one side of the plate body 11 at intervals along the circumference of the plate body 11, and each of the support platforms 12 is protruded relative to the plate body 11 so that an elastic support foil 3 can be set between any adjacent support platforms 12; and the middle part of the elastic support foil 3 is protruded relative to the support platforms 12 on both sides along the thickness direction of the plate body 11, so that the elastic support foil 3 can normally provide elastic ability by squeezing downward; at the same time, the top foil 2 is installed on the side of the support platform 12 away from the plate body 11, and the top foil 2 includes multiple bearing parts 21, and the multiple bearing parts 21 correspond to the multiple elastic support foils 3 one by one, so that the two can jointly provide elastic effect for the area where they are located; the bearing part 21 is formed with a wedge-shaped structure, so that the bearing part 21 and the corresponding elastic support foil 3 can both provide elastic effect, which makes the overall pressure-bearing capacity of the dynamic pressure gas foil bearing relatively strong. At the same time, the top foil 2 is an integrated annular structure, which allows any position on the circumference of the top foil 2 to transfer the aforementioned extrusion effect to the areas on both sides of the circumference when it is squeezed, thereby improving the pressure-bearing reliability of the entire top foil 2.

[0049] In addition, since the first and second ends of any bearing part 21, which are opposite to each other in the circumferential direction, gradually approach the support base plate 1 from the circumferential middle side close to the bearing part 21 to the circumferential edge side of the bearing part 21 to form a wedge-shaped structure, both circumferential ends of the bearing part 21 are set as wedge-shaped structures. Then, when the rotor of the rotating machinery where the dynamic pressure gas foil bearing is located rotates forward, the wedge-shaped structure at one circumferential end of the bearing part 21 can form a wedge-shaped space with the rotor, thereby forming a dynamic pressure gas film and bearing the force of the rotor. Correspondingly, when the rotor reverses, a wedge-shaped space can also be formed between the wedge-shaped structure at the other circumferential end of the bearing part 21 and the rotor, thereby forming a dynamic pressure gas film and bearing 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. This makes the dynamic pressure gas foil bearing disclosed in the embodiment of the present application have reversal adaptability.

[0050] As described above, the top foil 2 includes multiple bearing portions 21, with wedge-shaped structures provided at opposite ends of the bearing portions 21. More specifically, the bearing portions 21 include a bearing area 211 and a wedge-shaped area 212. The bearing area 211 is a flat plate-shaped structure and corresponds to the elastic support foil 3. Simultaneously, the bearing area 211 is spaced apart from the elastic support foil 3 in the thickness direction to ensure that the bearing area 211 can provide an elastic effect by moving toward the elastic support foil 3. Furthermore, wedge-shaped areas 212 are provided on opposite sides of the bearing area 211 in the circumferential direction. The wedge-shaped areas 212 are used to form the aforementioned wedge-shaped structure. Accordingly, the wedge-shaped areas 212 are generally inclined in the thickness direction of the plate body 11 to form a wedge-shaped space with the bearing area 211.

[0051] To improve the consistency of the support provided by the same bearing portion 21 during both forward and reverse rotation of the rotor, in this embodiment of the present application, the wedge-shaped regions 212 on opposite sides of any bearing region 211 are symmetrically arranged relative to the circumference. More specifically, the plane perpendicular to the plane containing the bearing region 211 and passing through the circumferential midpoint of the bearing region 211 and the diameter of the midpoint defines the plane of symmetry for the wedge-shaped regions 212 on opposite sides of the bearing region 211.

[0052] When this technical solution is adopted, the wedge-shaped areas 212 on opposite sides of any bearing area 211 can provide substantially the same function during both forward and reverse rotation of the rotor. This improves the overall reversal adaptability of the hydrodynamic gas foil bearing. Furthermore, this technical solution also reduces the overall processing difficulty of the top foil 2.

[0053] To further enhance the elasticity of the top foil 2, in a specific embodiment of the present application, the top foil 2 further comprises a plurality of transition portions 22. The wedge-shaped regions 212 of any two adjacent bearing portions 21 are fixedly connected via the transition portions 22. The transition portions 22 are flat-plate structures, and the plurality of transition portions 22 correspond one-to-one with the plurality of support platforms 12. In this case, on the one hand, the difficulty of processing any two adjacent bearing portions 21 can be reduced, and on the other hand, the processing accuracy of any two adjacent bearing portions 21 can be relatively higher. At the same time, after the elastic supporting foil 3 is deformed by compression, the transition portions 22 are able to be supported on the support platforms 12, thereby making the elasticity of the bearing portions 21 on opposite sides relatively stronger, thereby enhancing the overall elastic deformation capability of the top foil 2.

[0054] As described above, the load-bearing area 211 is generally located on the side of the transition area facing away from the support base plate 1. Therefore, when the load-bearing portions 21 are interconnected via the transition portion 22, the load-bearing area 211 is located on the side of the transition portion 22 facing away from the support base plate 1. Of course, the spacing between the load-bearing area 211 and the transition portion 22 in the thickness direction of the plate body 11 can be determined based on the overall dimensions of the dynamic pressure gas foil bearing. Typically, the spacing H between the load-bearing area 211 and the transition portion 22 in the thickness direction of the plate body 11 can be between 0.03 mm and 0.2 mm. Furthermore, the spacing H between the load-bearing area 211 and the transition portion 22 in the aforementioned thickness direction can be between 0.05 mm and 0.15 mm. In this case, the wedge-shaped area 212 can be ensured to have a good load-bearing capacity while minimizing manufacturing difficulty and processing costs.

[0055] In order to prevent the dynamic pressure gas foil bearing from partially or completely plastically deforming the elastic support foil 3 due to excessive deformation of the elastic support foil 3 when the dynamic pressure gas foil bearing is subjected to force, in a specific embodiment of the present application, the dynamic pressure gas foil bearing may also include a vibration damping plate 4, and the vibration damping plate 4 is an integrated annular structure, so that when any position on the circumference of the vibration damping plate 4 is subjected to extrusion, the aforementioned extrusion effect can be transmitted to the opposite sides of its own circumference, thereby utilizing other elastic support foils 3 to absorb the aforementioned extrusion effect, thereby preventing the elastic support foil 3 corresponding to the force-bearing position from being unable to recover the deformation due to excessive deformation, causing the elastic support foil 3 to fail.

[0056] In detail, the vibration-damping plate 4 is installed between the top foil 2 and the support platform 12 to ensure that the vibration-damping plate 4 can produce a certain elastic deformation by being supported on the support platform 12 when subjected to extrusion, thereby achieving the purpose of absorbing the extrusion force and weakening the extrusion effect. Moreover, after the elastic supporting foil 3 undergoes elastic deformation and moves the vibration-damping plate 4 toward the support platform 12 to be supported on the support platform 12, the vibration-damping plate 4 will hardly produce a large elastic deformation in the direction of the plate body 11, thereby reducing the maximum deformation of the elastic supporting foil 3. On the one hand, it can prevent the elastic supporting foil 3 from deforming too much and causing plastic deformation. On the other hand, it can also ensure that the recovery of the elastic supporting foil 3 after each deformation is relatively good, thereby improving the sustainability of the elastic supporting foil 3.

[0057] At the same time, in the dynamic pressure gas foil bearing disclosed in the embodiments of the present application, each elastic support foil 3 is arranged in contact with the vibration damping plate 4. That is, when the dynamic pressure gas foil bearing is not subjected to external forces, there is almost no interaction force between each elastic support foil 3 and the vibration damping plate 4. Of course, the two are not separated by a gap, but are in contact with each other. This ensures that when the vibration damping plate 4 is squeezed, the squeezing force can be transferred to the elastic support foil 3, thereby utilizing the elastic support foil 3 to absorb the squeezing force.

[0058] Furthermore, since each elastic support foil 3 is in contact with the vibration-damping plate 4, and the vibration-damping plate 4 is an integrated annular structure, when a certain position in the vibration-damping plate 4 is squeezed, the squeezing effect can be transmitted circumferentially on the vibration-damping plate 4. This allows the plurality of elastic support foils 3 to collectively absorb the aforementioned squeezing effect, thereby improving the reliability of the dynamic pressure gas foil bearing. Of course, in order to ensure that the vibration-damping plate 4 has a load-bearing capacity that meets the requirements, its thickness must meet the requirements to prevent it from being too thin, thereby preventing plastic deformation and failure when squeezed. Specifically, in a specific embodiment of the present application, the vibration-damping plate 4 is formed of a metal material, and the thickness of the vibration-damping plate 4 can be between 0.2 and 0.4 mm.

[0059] Specifically, the vibration-damping plate 4 can be assembled with the supporting base plate 1 through a connector to ensure that a gap is formed between the two in the thickness direction, thereby preventing the setting of the vibration-damping plate 4 from adversely affecting the elastic range of the elastic supporting foil 3 .

[0060] More specifically, the support base plate 1, the vibration-damping plate 4, and the top foil 2 can each be provided with a plurality of through-holes. In this case, the support base plate 1, the vibration-damping plate 4, and the top foil 2 can be assembled using pins. Furthermore, based on the thickness dimension of the portion of the elastic support foil 3 protruding from the support platform 12, the length of the pins can be designed accordingly. This ensures that, after assembly, the support base plate 1 and the vibration-damping plate 4 are spaced apart from each other and that the vibration-damping plate 4 contacts the elastic support foil 3. That is, in the dynamic pressure gas foil bearing disclosed in the embodiments of the present application, a floating clearance of a predetermined size is provided between the vibration-damping plate 4 and the support base plate 1 in the thickness direction.

[0061] Optionally, the number of through holes 13 on the supporting base plate 1 is at least three. In a specific embodiment of the present application, the number of through holes 13 on the supporting base plate 1 can be the same as the number of support platforms 12, and each support platform 12 is correspondingly provided with a through hole 13, and the through hole 13 is arranged through the support platform 12 and the base plate along the thickness direction. Correspondingly, a corresponding number of through holes 23 are also provided on the top foil 2, and a corresponding number of through holes are also provided on the vibration damping plate 4. This can improve the assembly reliability between the vibration damping plate 4 and the top foil 2 and the supporting base plate 1, and ensure that the consistency of the elastic support capacity at different circumferential positions in the dynamic pressure gas foil bearing is relatively good.

[0062] As described above, the wedge-shaped area 212 of the top foil 2 can form a wedge-shaped space, and because the bearing portion 21 corresponds to the elastic support foil 3 as a whole, before the elastic support foil 3 deforms, the bearing area 211 has already undergone relative displacement relative to the supporting base plate 1, thereby causing elastic deformation of the wedge-shaped area 212. Based on this, in order to prevent the wedge-shaped area 212 from excessively deforming and being unable to recover its deformation, resulting in failure of the dynamic pressure gas foil bearing, in a specific embodiment of the present application, a bearing plate 5 may also be included. The bearing plate 5 is mounted on the side of the vibration-damping plate 4 facing the top foil 2. The bearing plate 5 includes a plurality of bearing plates 51, and the plurality of bearing plates 51 correspond one-to-one to the plurality of the bearing areas 211.

[0063] That is, in the hydrodynamic gas foil bearing disclosed in the embodiments of the present application, a bearing sheet 51 can be provided between any bearing area 211 and the vibration damping plate 4. In this case, the bearing sheet 51 can reduce the relative displacement of the bearing area 211, thereby reducing the degree of deformation of the wedge-shaped area 212, and preventing the wedge-shaped area 212 from being unable to return to its original state due to excessive deformation. In addition, in this case, the squeezing effect of the extrusion force on the bearing portion 21 can be minimized, so that the squeezing effect can be more quickly transmitted to the elastic support foil 3, which can further improve the reliability and sustainability of the bearing portion 21.

[0064] As described above, the bearing plate 5 is mounted on the vibration-damping plate 4. Specifically, a fixed connection such as welding can be formed between the two. To prevent the bearing area 211 from reducing the transmission effect of the extrusion force due to the fixed connection between the bearing plate 51 and the vibration-damping plate 4 during the process of squeezing the vibration-damping plate 4 and the elastic supporting foil 3 through the bearing plate 51, in a specific embodiment of the present application, the bearing plate 51 and the vibration-damping plate 4 can be mutually limited only in the circumferential direction, while being relatively movable in the thickness direction of the plate body 11. Of course, in this case, to ensure that each bearing plate 51 and the vibration-damping plate 4 can be relatively fixed in the circumferential direction, each bearing plate 51 can optionally be provided with two or more through-holes. By installing a pin or other structure in each through-hole and interconnecting the pin with the vibration-damping plate 4, each bearing plate 51 can be ensured to be relatively fixed in the circumferential direction, without hindering the bearing plate 51 from causing relative displacement or deformation with the vibration-damping plate 4 in the thickness direction of the plate body 11.

[0065] To reduce the overall installation difficulty of the multiple bearing plates 51, the bearing plate 5 can optionally include a connecting portion 52, as shown in the figure. The connecting portion 52 is mounted on the supporting base plate 1. The connecting portion 52 is a closed annular structure and is arranged around the outer circumference of the multiple bearing plates 51. In the radial direction of the connecting portion 52, the end of each bearing plate 51 close to the connecting portion 52 is fixedly connected to the connecting portion 52. In this case, by forming an assembly relationship between the connecting portion 52 and the vibration-damping plate 4, it is ensured that each bearing plate 51 can form a precise fit with the corresponding bearing area 211, which can significantly reduce the assembly difficulty of the entire dynamic pressure gas foil bearing.

[0066] At the same time, in the dynamic pressure gas foil bearing disclosed in the embodiment of the present application, the end of each carrier sheet 51 away from the connecting portion 52 can be a free end. In this case, each carrier sheet 51 still has good deformation ability, ensuring that the carrier sheet 51 still has good transmission ability of the extrusion effect. Of course, during the processing, the connecting portion 52 and the multiple carrier sheets 51 can be formed in an integrally molded manner to improve the connection reliability between each carrier sheet 51 and the connecting portion 52. Moreover, to reduce the probability of plastic deformation of the carrier sheet 51, in the embodiment of the present application, the thickness of the carrier sheet 51 can be between 0.3-0.5 mm, which ensures that each carrier sheet 51 has good supporting strength. Accordingly, for the connecting portion 52, its thickness can also be the same as the thickness of the carrier sheet 51 to reduce the processing difficulty of both and ensure that the overall force uniformity of the top foil 2 is relatively good when the top foil 2 is pressed against the supporting plate 5.

[0067] More specifically, in the case where the dynamic pressure gas foil bearing disclosed in the embodiment of the present application is not subjected to external forces, a relatively small gap can be provided between the load-bearing area 211 and the corresponding load-bearing sheet 51 along the thickness direction of the plate body 11. In other embodiments of the present application, the two can also be made to fit together in the aforementioned thickness direction. Of course, the load-bearing sheet 51 and the vibration-damping plate 4 are arranged to fit together.

[0068] As described above, the supporting base plate 1, the vibration-damping plate 4 and the top foil 2 can be assembled by means of pins. Based on this, when the supporting plate 5 includes the above-mentioned connecting portion 52, through holes can also be provided at corresponding positions of the connecting portion 52, so that the supporting plate 5 can also form a good assembly relationship with the supporting base plate 1 and the vibration-damping plate 4 by means of pins.

[0069] Of course, for the elastic support foil 3, in order to ensure a stable relative positional relationship between it and the supporting base plate 1, the elastic support foil 3 needs to be fixed to the supporting base plate 1 by welding or other means. In order to minimize the impact of the fixed relationship between the two on the elastic ability of the elastic support foil 3, in a specific embodiment of the present application, the elastic support foil 3 can include a fixedly connected elastic protrusion 31 and an assembly flat plate portion 32 in the circumferential direction of the plate body 11, wherein the elastic protrusion 31 is parallel to the edge of the first end and protrudes toward the top foil 2 to ensure that it has good deformation ability in the circumferential direction. At the same time, by welding the assembly flat plate portion 32 to the plate body 11, in this case, the elastic protrusion 31 is indirectly fixed to the plate body 11 via the assembly flat plate portion 32, which can minimize the impact of the aforementioned welding fixation on the elastic deformation of any position on the elastic protrusion 31, thereby ensuring that the elastic deformation ability of any position on the elastic protrusion 31 is relatively good.

[0070] Optionally, a weld extending radially along the plate body 11 may be formed between the assembly flat plate portion 32 and the plate body 11. In order to further reduce the weakening effect of the welding relationship on the deformation ability of the elastic protrusion 31, in another embodiment of the present application, the assembly flat plate portion 32 may be provided with a plurality of welding points W, and the plurality of welding points W may be distributed at intervals along the radial direction of the plate body 11. More specifically, the plurality of welding points W on the assembly flat plate portion 32 may be evenly distributed. The spacing between the welding points W and the number of welding points W on each assembly flat plate portion 32 may be determined based on the overall size of the dynamic pressure gas foil bearing. In a specific embodiment of the present application, the number of welding points W on each assembly flat plate portion 32 is at least 6, and the spacing between the welding points W may be between 2 and 5 mm.

[0071] In addition, the elastic support foil 3 may further include a mating flat portion 33, and the mating flat portion 33 is connected to the end of the elastic protrusion 31 that faces away from the assembly flat portion 32. In other words, in the circumferential direction of the plate body 11, one end of the elastic protrusion 31 is connected to the mating flat portion 33, and the other end is connected to the assembly flat portion 32. Under the action of the assembly flat portion 32, the entire contact area between the elastic support foil 3 and the plate body 11 can be increased, thereby reducing the relative force between the elastic protrusion 31 and the plate body 11 when the elastic protrusion 31 undergoes elastic deformation, thereby making it easier for the elastic protrusion 31 to expand and deform, thereby improving its elastic capacity. Of course, there is no limiting or connection relationship between the mating flat portion 33 and the plate body 11.

[0072] Based on the dynamic pressure gas foil bearing provided in any of the above embodiments, embodiments of the present application further provide a rotary machine comprising any of the above dynamic pressure gas foil bearings. Examples of the rotary machine include a centrifugal compressor, a blower, and the like. The dynamic pressure gas foil bearing included in the rotary machine may be, for example, a dynamic pressure gas foil thrust bearing, a dynamic pressure gas foil radial bearing, or both.

[0073] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0074] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0075] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A dynamic pressure gas foil bearing, characterized in that: It comprises a supporting base plate (1), a top foil (2) and a plurality of elastic supporting foils (3), wherein: The supporting base plate (1) comprises a plate body (11) and a plurality of supporting platforms (12), wherein the plurality of supporting platforms (12) are fixed to one side of the plate body (11) at intervals along the circumference of the plate body (11), and each of the supporting platforms (12) is arranged to protrude relative to the plate body (11); The top foil (2) is installed on a side of the support platform (12) away from the plate body (11), the top foil (2) is an integrated annular structure, and the top foil (2) includes a plurality of bearing parts (21), the plurality of bearing parts (21) correspond one to one with the plurality of elastic supporting foils (3), and any of the bearing parts (21) includes a first end and a second end that are arranged opposite to each other along the circumferential direction, the first end and the second end respectively gradually approach the supporting bottom plate (1) along the circumferential direction from a side close to the circumferential middle of the bearing part (21) to a side close to the circumferential edge of the bearing part (21) to form a wedge-shaped structure; The elastic support foil (3) is provided between any two adjacent support platforms (12), and in the circumferential direction, the middle portion of the elastic support foil (3) is protruding relative to the support platforms (12) on both sides thereof along the thickness direction of the plate body (11).

2. The dynamic pressure gas foil bearing according to claim 1, characterized in that: The bearing portion (21) comprises a bearing area (211) and a wedge-shaped area (212); the bearing area (211) is a flat plate structure and corresponds to the elastic supporting foil (3); in the thickness direction, the bearing area (211) and the elastic supporting foil (3) are spaced apart; in the circumferential direction, the wedge-shaped areas (212) are provided on opposite sides of the bearing area (211), and the wedge-shaped areas (212) on opposite sides of any bearing area (211) are symmetrically arranged relative to the circumferential direction.

3. The dynamic pressure gas foil bearing according to claim 2, characterized in that: The top foil (2) further comprises a plurality of transition portions (22), wherein the wedge-shaped areas (212) of any two adjacent bearing portions (21) are fixedly connected via the transition portions (22), the transition portions (22) are flat plate structures, and the plurality of transition portions (22) correspond one-to-one to the plurality of support platforms (12).

4. The dynamic pressure gas foil bearing according to claim 3, characterized in that: In the thickness direction, the distance between the bearing area (211) and the transition portion (22) is between 0.03 mm and 0.2 mm.

5. The dynamic pressure gas foil bearing according to claim 2, characterized in that: It also includes a vibration-damping plate (4), which is an integrated annular structure. The vibration-damping plate (4) is installed between the top foil (2) and the support platform (12), and each of the elastic support foils (3) is arranged in contact with the vibration-damping plate (4).

6. The dynamic pressure gas foil bearing according to claim 5, characterized in that: It also includes a bearing plate (5), which is installed on the side of the vibration-damping plate (4) facing the top foil (2), and the bearing plate (5) includes a plurality of bearing plates (51), and the plurality of bearing plates (51) correspond one-to-one to the plurality of bearing areas (211).

7. The dynamic pressure gas foil bearing according to claim 6, characterized in that: The carrying plate (5) further comprises a connecting portion (52), the connecting portion (52) being mounted on the supporting base plate (1), the connecting portion (52) being a closed annular structure, the connecting portion (52) being arranged around the outer periphery of a plurality of the carrying sheets (51), and in the radial direction of the connecting portion (52), one end of each of the carrying sheets (51) close to the connecting portion (52) is fixedly connected to the connecting portion (52), and one end of each of the carrying sheets (51) away from the connecting portion (52) is a free end.

8. The dynamic pressure gas foil bearing according to claim 5, characterized in that: The supporting base plate (1), the vibration-damping plate (4) and the top foil (2) are all provided with a plurality of through holes so as to assemble the supporting base plate (1), the vibration-damping plate (4) and the top foil (2) by means of pins, and a floating gap is provided between the vibration-damping plate (4) and the supporting base plate (1) in the thickness direction.

9. The dynamic pressure gas foil bearing according to claim 1, characterized in that: In the circumferential direction, one end of any of the elastic support foils (3) is fixedly connected to the plate body (11), and the other end is a free end and is spaced apart from the adjacent support platform (12).

10. The dynamic pressure gas foil bearing according to claim 9, characterized in that: In the circumferential direction, the elastic supporting foil (3) comprises an elastic protrusion (31) and an assembly flat plate portion (32) that are fixedly connected, the elastic protrusion (31) is parallel to the edge of the first end and protrudes toward the top foil (2), and the assembly flat plate portion (32) is welded and fixed to the plate body (11).

11. The dynamic pressure gas foil bearing according to claim 10, characterized in that: The assembly flat plate portion (32) is provided with a plurality of welding points (W), and the plurality of welding points (W) are distributed at intervals along the radial direction of the plate body (11).

12. A rotating machine, characterized in that: A dynamic pressure gas foil bearing comprising the one of claims 1 to 11.

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