Dynamic pressure gas foil bearing and rotating machine

Abstract

The utility model 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] This application relates to the field of bearings, and more particularly to a hydrodynamic gas foil bearing and rotating machinery. Background Technology

[0002] Hydrodynamic gas foil bearings utilize the wedge-shaped space formed between the rotor bearing disc and the bearing surface to create a wedge effect. As the rotor speed increases, due to the viscosity of the gas, surrounding gas is continuously drawn into the wedge-shaped space between the rotor and bearing. As the gas pressure within the wedge-shaped space increases, a hydrodynamic gas film forms when the bearing speed reaches a certain value, achieving a stable gas lubrication state. Under the hydrodynamic effect, the higher the speed, the higher the bearing's load-bearing capacity. Utilizing the gas film to bear the load significantly reduces friction. Compared to other types of bearings, gas bearings offer numerous advantages, including oil-free operation, no pollution, low operating resistance, simple structure, and low mechanical loss. Gas bearing technology overcomes many shortcomings of traditional liquid bearings, sliding bearings, and rolling bearings, and has been widely used in high-speed rotating machinery and precision machining machinery. It is particularly favored in applications such as food processing, brewing, and data centers. Under the requirements of energy conservation, emission reduction, and environmental protection, the application of hydrodynamic gas foil bearings has significant market potential and prospects.

[0003] While dynamic pressure gas foil bearings offer advantages during use, they also have drawbacks. Optimizing and improving their load-bearing capacity and mitigating the risk of burnout during reverse operation is crucial. For example, in the refrigeration centrifugal compressor and blower industries, during high-load operation, if an abnormal shutdown or a rapid load reduction is needed, the high-pressure side pressure cannot be quickly released. Without a power source, the compressor rotor may reverse under the influence of the high-pressure differential. In this situation, the bearing must have a certain anti-reverse rotation capability, but currently, dynamic pressure gas foil bearings do not possess this capability.

[0004] The hydrodynamic gas foil bearings of the relevant technology generally do not have the ability to prevent reverse rotation. When the rotor reverses, the hydrodynamic gas foil bearing may be damaged or even destroyed because it cannot form a hydrodynamic gas film. Utility Model Content

[0005] This application provides a hydrodynamic gas foil bearing and rotating machinery to solve the problem that hydrodynamic gas foil bearings in related technologies generally do not have anti-reverse rotation capability.

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

[0007] The supporting base plate includes a plate body and multiple supporting platforms. The multiple supporting platforms are fixed at intervals along the circumference of the plate body on one side of the plate body, and each supporting platform protrudes relative to the plate body.

[0008] The top foil is installed on the side of the support platform away from the plate. The top foil is an integral ring structure and includes multiple bearing parts. Each of the multiple bearing parts corresponds to a multiple elastic support foil. Each bearing part 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 are respectively arranged along the circumferential direction from the side near the circumferential center of the bearing part to the side near the circumferential edge of the bearing part, gradually approaching the support base plate to form a wedge structure.

[0009] The elastic support foil is provided between any two adjacent support platforms. In the circumferential direction, the middle part of the elastic support foil protrudes from the support platforms on both sides of the plate along the thickness direction of the plate.

[0010] Secondly, this application provides a rotating machine comprising the aforementioned hydrodynamic gas foil bearing.

[0011] The technical solution provided in this application embodiment can provide good support when the rotor reverses. Specifically, in the support base plate of the hydrodynamic gas foil bearing, multiple support platforms are fixed at intervals along the circumference of the plate body on one side. Each support platform protrudes relative to the plate body, so that elastic support foils can be set between any adjacent support platforms. Furthermore, the middle part of the elastic support foil protrudes 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 elasticity by downward compression. 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, each bearing part corresponding to a multiple elastic support foil, so that the two can jointly provide elasticity to the area. The bearing parts are formed with a wedge-shaped structure, so that both the bearing parts and the corresponding elastic support foils can provide elasticity, which makes the overall pressure bearing capacity of the hydrodynamic gas foil bearing relatively strong. Meanwhile, the top foil has an integrated ring structure, which allows any position on the top foil in the circumferential direction to transfer the aforementioned compressive force to the areas on both sides of its circumference when it is compressed, thereby improving the pressure-bearing reliability of the entire top foil.

[0012] Furthermore, since the first and second ends of any bearing portion, which are circumferentially opposite each other, gradually approach the support base plate from the circumferential center of the bearing portion towards the circumferential edge of the bearing portion to form a wedge-shaped structure, both circumferential ends of the bearing portion are set as wedge-shaped structures. Consequently, when the rotor of the rotating machinery where the hydrodynamic gas foil bearing is located rotates forward, the wedge-shaped structure at one circumferential end of the bearing portion can form a wedge-shaped space with the rotor, thereby forming a hydrodynamic gas film and bearing the force of the rotor. Correspondingly, when the rotor reverses, the wedge-shaped structure at the other circumferential end of the bearing portion can also form a wedge-shaped space with the rotor, thereby forming a hydrodynamic gas film and bearing the force of the rotor. This allows the hydrodynamic gas foil bearing to maintain its normal working state and prevents damage or even destruction of the hydrodynamic gas foil bearing due to the inability to form a hydrodynamic gas film. This gives the hydrodynamic gas foil bearing disclosed in this application an ability to adapt to reversal. Attached Figure Description

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

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 This is a schematic diagram of the structure of the hydrodynamic gas foil bearing provided in the embodiments of this application;

[0017] Figure 2 An exploded view of the hydrodynamic gas foil bearing provided in an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the structure of the support base plate in the hydrodynamic gas foil bearing provided in the embodiments of this application;

[0019] Figure 4 This is a schematic diagram of the structure of the top foil in the hydrodynamic gas foil bearing provided in the embodiments of this application;

[0020] Figure 5This is a schematic diagram of the assembly between the elastic support foil and the support base plate in the hydrodynamic gas foil bearing provided in this application embodiment;

[0021] Figure 6 This is a cross-sectional schematic diagram of the hydrodynamic gas foil bearing provided in an embodiment of this application.

[0022] Explanation of reference numerals in the attached figures:

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

[0024] 2. Top layer foil; 21. Bearing section; 211. Bearing area; 212. Wedge-shaped area; 22. Transition section; 23. Through hole;

[0025] 3. Elastic support foil; 31. Elastic protrusion; 32. Assembled flat plate part; 33. Fitting flat plate part;

[0026] 4. Vibration-damping plate;

[0027] 5. Support plate; 51. Support piece; 52. Connecting part;

[0028] W - Solder joint. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0031] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0032] To address the problem in existing technologies where rotor reversal prevents the formation of a dynamic pressure gas film in the bearings, thus causing damage or even destruction of the foil bearings, such as... Figures 1-6 As shown, this application provides a hydrodynamic gas foil bearing that can provide approximately the same force when the rotor rotates forward and reverses, ensuring that the hydrodynamic gas foil bearing has a strong ability to adapt to reverse rotation.

[0033] like Figure 1 and Figure 2 As shown in the figure, this application provides a hydrodynamic gas foil bearing, including a support 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, preferably, the number of elastic support foils 3 can be greater than three.

[0034] Among them, such as Figure 2 and Figure 5 As shown in this embodiment, the support base plate 1 includes a plate body 11 and a plurality of support platforms 12. The plurality of support platforms 12 are fixedly spaced along the circumference of the plate body 11 on one side of the plate body 11, and each support platform 12 protrudes relative to the plate body 11. That is, in the hydrodynamic gas foil bearing provided in this embodiment, a receiving groove can be formed between the plurality of support platforms 12 of the support base plate 1, and the number of receiving grooves is the same as the number of support platforms 12. In other words, in this embodiment, along the circumference of the plate body 11, any two adjacent support platforms 12 form a receiving groove by cooperating with the plate body 11, and the receiving groove is used to receive the elastic support foil 3.

[0035] More specifically, the plate 11 and the multiple support platforms 12 can be integrally formed, which makes the connection between any support platform 12 and the plate 11 relatively reliable. The plate 11 can be a ring-shaped structure. In one specific embodiment of this 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 are not limited herein. 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 11 can also be the same. This facilitates the processing and installation of the elastic support foil 3, and can improve the pressure uniformity of the entire hydrodynamic gas foil bearing in the circumferential direction to a certain extent, thereby improving the reliability and service life of the hydrodynamic 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 support base plate 1, and to improve the overall elastic support effect of the elastic support foil 3 and the top foil 2, the bottom of the groove and the surface of the support platform 12 facing away from the plate 11 are both flat and perpendicular to the thickness direction of the plate 11. Furthermore, the bottoms of multiple grooves can be located in the same plane, and the surfaces of multiple support platforms 12 facing away from the plate 11 can also be located in the same plane. This reduces the overall processing difficulty of the top foil 2 and allows the multiple elastic support foils 3 to have the same structure and dimensions, further reducing the processing and assembly difficulty of the multiple elastic support foils 3 and further improving the circumferential pressure uniformity of the entire hydrodynamic gas foil bearing.

[0037] During the assembly of the hydrodynamic gas foil bearing, the top foil 2 is installed on the side of the support platform 12 away from the plate 11. In this embodiment, the top foil 2 is an integral annular structure, which makes the overall processing of the top foil 2 relatively easy. Specifically, the top foil 2 can be formed by stamping. Since the top foil 2 is an integral annular structure, the elastic compression effect received at different positions in the top foil 2 can be transmitted to both sides of the circumference in the plate 11. This can increase the upper limit of the pressure at each position in the circumference of 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 compression capability, in this embodiment of the application, the top foil 2 includes a plurality of supporting parts 21, and the plurality of supporting parts 21 are arranged in sequence. Optionally, any two adjacent supporting parts 21 can be directly connected, or in other embodiments of the application, any two adjacent supporting parts 21 can be indirectly connected to each other through other structures so that the top foil 2 forms a ring structure.

[0039] Simultaneously, multiple load-bearing portions 21 correspond one-to-one with multiple elastic support foils 3, enabling the hydrodynamic gas foil bearing to utilize both the load-bearing portions 21 and the elastic support foils 3 to provide elasticity, ensuring relatively good overall elasticity. Furthermore, the load-bearing portions 21, by forming a wedge-shaped structure, enable the hydrodynamic gas foil bearing to adapt to reversible rotation.

[0040] In detail, each supporting portion 21 includes a first end and a second end arranged circumferentially opposite each other, and the first end and the second end gradually approach the supporting base plate 1 from the side near the circumferential center of the supporting portion 21 towards the circumferential edge of the supporting portion 21 to form a wedge-shaped structure. It should be noted that, in the embodiments of this application, as described above, the top foil 2 is an integral annular structure. Therefore, the top foil 2 does not objectively have a free end. In order to facilitate the description of the specific structure of the top foil 2, this application regards the top foil 2 as including multiple independent supporting portions 21, and each supporting portion 21 has a first end and a second end arranged circumferentially opposite each other. In the actual structure, any two adjacent supporting portions 21 in the top foil 2 are interconnected.

[0041] With the above structure, both ends of the bearing portion 21 are set as wedge-shaped structures. When the rotor of the rotating machinery where the hydrodynamic gas foil bearing is located rotates forward, a wedge-shaped space is formed between the wedge-shaped structure at one end of the bearing portion 21 and the rotor, which can form a hydrodynamic gas film to bear the force of the rotor. When the reverse rotation occurs, a wedge-shaped space can also be formed between the wedge-shaped structure at the other end of the bearing portion 21 and the rotor, which can also form a hydrodynamic gas film to bear the force of the rotor. This allows the hydrodynamic gas foil bearing to maintain its normal working state and will not cause damage or even destruction to the hydrodynamic gas foil bearing due to the failure to form a hydrodynamic gas film caused by the rotor reversal. Thus, the hydrodynamic gas foil bearing has the ability to adapt to reversal.

[0042] As described above, the hydrodynamic gas foil bearing includes multiple 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 adjacent support platforms 12. Meanwhile, to ensure relatively good positional stability of the elastic support foil 3 during elastic deformation and after recovery of elastic deformation, in the hydrodynamic gas foil bearing disclosed in this application embodiment, the dimensions of the elastic support foil 3 can be designed according to parameters such as the circumferential spacing of 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] Meanwhile, to ensure that the elastic support foil 3 has the ability to withstand elastic compression, its shape and size are designed during the formation of the elastic support foil 3 so that the middle part of the elastic support foil 3 protrudes from the support platforms 12 on both sides along the thickness direction of the plate 11. That is, the middle part of the elastic support foil 3 can extend beyond the receiving groove, ensuring that the elastic support foil 3 can provide elasticity through mutual compression with the top foil 2 and other structures. Specifically, the size of the elastic support foil 3 protruding beyond the support platform 12 can be determined according to the overall size of the hydrodynamic gas foil bearing. Generally, the distance between the middle part of the elastic support foil 3 protruding from the side of the support platform 12 away from the plate 11 can be between 0.03-0.15mm, and more specifically, the aforementioned distance can be between 0.05-0.1mm. This can ensure that the hydrodynamic gas foil bearing has a relatively good gas 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 positional relationship between the elastic support foil 3 and the support base plate 1, in a specific embodiment of this application, one end of any elastic support foil 3 can be fixedly connected to the plate 11 in the circumferential direction of the plate body 11.

[0045] Specifically, the elastic support foil 3 can be fixedly connected to the plate 11 through connectors or the like. In other embodiments of this application, both the elastic support foil 3 and the support base plate 1 can be made of materials such as metal. In this case, the elastic support foil 3 and the plate 11 can also be fixedly connected by welding or the like.

[0046] Meanwhile, the other end of the elastic support foil 3 in the circumferential direction can be left as a free end, which makes the elastic deformation capability of the elastic support foil 3 relatively strong. Of course, in order to ensure that the elastic support foil 3 can deform by expanding towards its free end, in this embodiment, 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 expansion and deformation of the elastic support foil 3. Specifically, the actual size of the aforementioned interval can be determined according to the specific situation, and the end of the elastic support foil 3 that is fixed to the plate 11 can also be spaced apart from the other adjacent support platform 12 in the aforementioned circumferential direction, which can reduce the difficulty of fixing the elastic support foil 3 to the plate 11.

[0047] Correspondingly, the top foil 2 also needs to be assembled with the supporting base plate 1 so that the relative position between the two can be restricted, thereby ensuring that the top foil 2 can absorb the impact force by undergoing elastic deformation and pressing against the supporting base plate 1. Optionally, other structures can be provided between the bearing portions 21 in the top foil 2. In this case, the aforementioned other structures can be fixedly connected to the corresponding supporting platform 12, or, if the bearing portions 21 are directly connected, the connection area between the bearing portions 21 can also be fixedly connected to the supporting platform 12. In another embodiment of this application, a structure such as a pin can also be used to connect the top foil 2 and the supporting base plate 1. In this case, by controlling the limiting range of the pin, the relative movement range between the top foil 2 and the supporting base plate 1 in the thickness direction of the supporting base plate 1 can be restricted to prevent them from loosening and separating, and to prevent the connection between the top foil 2 and the supporting base plate 1 from weakening the elasticity of the elastic supporting foil 3 and the top foil 2.

[0048] The technical solution provided in this application embodiment can provide good support when the rotor reverses. Specifically, in the support base plate 1 of the hydrodynamic gas foil bearing, multiple support platforms 12 are fixed at intervals along the circumference of the plate 11 on one side of the plate 11. Each support platform 12 protrudes relative to the plate 11, so that an elastic support foil 3 can be provided between any adjacent support platforms 12. Furthermore, the middle part of the elastic support foil 3 protrudes relative to the support platforms 12 on both sides along the thickness direction of the plate 11, so that the elastic support foil 3 can normally provide elasticity by downward compression. At the same time, the top foil 2 is installed on the side of the support platform 12 away from the plate 11, and the top foil 2 includes multiple bearing parts 21. The multiple bearing parts 21 correspond one-to-one with the multiple elastic support foils 3, so that the two can jointly provide elasticity to the area. The bearing parts 21 are formed with a wedge-shaped structure, so that both the bearing parts 21 and the corresponding elastic support foils 3 can provide elasticity, which makes the overall pressure bearing capacity of the hydrodynamic gas foil bearing relatively strong. Meanwhile, the top foil 2 is an integrated ring structure, which allows any position on the top foil 2 in the circumferential direction to transfer the aforementioned compressive force to the areas on both sides of its circumference when it is compressed, thereby improving the pressure-bearing reliability of the entire top foil 2.

[0049] Furthermore, since the first and second ends of any bearing portion 21, which are circumferentially opposite each other, gradually approach the support base plate 1 from the side near the circumferential center of the bearing portion 21 towards the circumferential edge of the bearing portion 21 to form a wedge-shaped structure, both circumferential ends of the bearing portion 21 are set as wedge-shaped structures. Therefore, when the rotor of the rotating machinery where the hydrodynamic gas foil bearing is located rotates forward, the wedge-shaped structure at one circumferential end of the bearing portion 21 can form a wedge-shaped space with the rotor, thereby forming a hydrodynamic gas film and bearing the force of the rotor. Correspondingly, when the rotor reverses, the wedge-shaped structure at the other circumferential end of the bearing portion 21 can also form a wedge-shaped space with the rotor, thereby forming a hydrodynamic gas film and bearing the force of the rotor. This allows the hydrodynamic gas foil bearing to maintain its normal working state and prevents damage or even destruction of the hydrodynamic gas foil bearing due to the inability to form a hydrodynamic gas film. This gives the hydrodynamic gas foil bearing disclosed in this application embodiment the ability to adapt to reversal.

[0050] As described above, the top foil 2 includes multiple supporting portions 21, each with a wedge-shaped structure at both ends. More specifically, each supporting portion 21 includes a supporting area 211 and a wedge-shaped area 212. The supporting area 211 is a flat plate structure and corresponds to the elastic support foil 3. Furthermore, in the thickness direction, the supporting area 211 and the elastic support foil 3 are spaced apart to ensure that the supporting area 211 can provide an elastic effect by moving towards the elastic support foil 3. In the circumferential direction, wedge-shaped areas 212 are provided on both sides of the supporting area 211, forming the aforementioned wedge-shaped structure. Correspondingly, in the thickness direction of the plate 11, the wedge-shaped areas 212 are inclined as a whole to form a wedge-shaped space with the supporting area 211.

[0051] To improve the consistency of the support provided by the same bearing portion 21 during rotor forward and reverse rotation, in this embodiment, the wedge-shaped regions 212 on opposite sides of any bearing area 211 are symmetrically arranged circumferentially. More specifically, a plane perpendicular to the plane containing the bearing area 211, and passing through the midpoint of the bearing area 211 in the circumferential direction and the diameter containing that midpoint, is the plane of symmetry of the wedge-shaped regions 212 on opposite sides of the bearing area 211.

[0052] By adopting the above technical solution, the wedge-shaped areas 212 on both sides of any bearing area 211 can provide approximately the same effect during the forward and reverse rotation of the rotor, which makes the entire hydrodynamic gas foil bearing have better reverse rotation adaptability. At the same time, by adopting the above technical solution, the overall processing difficulty of the top foil 2 is also relatively small.

[0053] To further enhance the elasticity of the top foil 2, in one specific embodiment of this application, the top foil 2 further includes multiple transition portions 22. The wedge-shaped regions 212 of any two adjacent support portions 21 are fixedly connected through the transition portions 22. The transition portions 22 are flat plate structures, and each of the multiple transition portions 22 corresponds one-to-one with a multiple support platforms 12. In this case, on the one hand, the processing difficulty of any two adjacent support portions 21 can be reduced; on the other hand, the processing precision of any two adjacent support portions 21 can be relatively higher. Simultaneously, after the elastic support foil 3 is deformed by compression, the transition portions 22 can be supported on the support platforms 12, thereby making their elasticity relatively stronger than that of the support portions 21 on both sides, thus improving the overall elastic deformation capability of the top foil 2.

[0054] As described above, the bearing area 211 is generally located on the side of the transition area away from the supporting base plate 1. Therefore, when the bearing portions 21 are interconnected through the transition portions 22, the bearing area 211 is located on the side of the transition portions 22 away from the supporting base plate 1. Of course, the distance between the two in the thickness direction of the plate body 11 can be determined according to the overall dimensions of the hydrodynamic gas foil bearing. Typically, in the thickness direction of the plate body 11, the distance H between the bearing area 211 and the transition portion 22 can be between 0.03mm and 0.2mm. Furthermore, in the aforementioned thickness direction, the distance H between the bearing area 211 and the transition portion 22 can be between 0.05mm and 0.15mm. In this case, while ensuring that the wedge-shaped area 212 has good load-bearing capacity, the manufacturing difficulty and processing cost can be reduced as much as possible.

[0055] To prevent the elastic support foil 3 from undergoing excessive deformation under stress, which could lead to partial or complete plastic deformation of the elastic support foil 3, in one specific embodiment of this application, the hydrodynamic gas foil bearing may further include a damping plate 4. The damping plate 4 is an integral annular structure, which allows any position of the damping plate 4 in the circumferential direction to transmit the aforementioned compression force to the opposite sides in its circumferential direction when subjected to compression. This allows other elastic support foils 3 to absorb the aforementioned compression force, preventing the elastic support foil 3 at the stress position from failing due to excessive deformation and inability to recover its deformation.

[0056] In detail, the damping plate 4 is installed between the top foil 2 and the support platform 12 to ensure that when subjected to compression, the damping plate 4 can undergo a certain amount of elastic deformation by supporting itself on the support platform 12, thereby absorbing the compression force and weakening the compression effect. Furthermore, after the elastic support foil 3 undergoes elastic deformation and moves the damping plate 4 closer to the support platform 12, it prevents the damping plate 4 from undergoing significant elastic deformation in the direction of the plate 11. This reduces the maximum deformation of the elastic support foil 3, preventing excessive deformation and plastic deformation, and ensuring relatively good recovery after each deformation, thus improving the durability of the elastic support foil 3.

[0057] Meanwhile, in the hydrodynamic gas foil bearing disclosed in this application embodiment, each elastic support foil 3 is disposed in contact with the damping plate 4. That is, when the hydrodynamic gas foil bearing is not subjected to external force, there is almost no interaction force between each elastic support foil 3 and the damping plate 4. Of course, the two are not spaced apart, but in contact with each other, so as to ensure that when the damping plate 4 is subjected to compression, the compression force can be transmitted to the elastic support foil 3, thereby utilizing the elastic support foil 3 to absorb the aforementioned compression force.

[0058] Furthermore, since each elastic support foil 3 is in contact with the damping plate 4, and the damping plate 4 is an integral ring structure, when a certain position in the damping plate 4 is compressed, the compression effect can be transmitted circumferentially along the damping plate 4. This allows multiple elastic support foils 3 to absorb the aforementioned compression effect simultaneously, improving the reliability of the hydrodynamic gas foil bearing. Of course, to ensure that the damping plate 4 has the required load-bearing capacity, its thickness must meet the requirements to prevent it from being too thin, which could lead to plastic deformation and failure under compression. Specifically, in one embodiment of this application, the damping plate 4 is made of metal, and its thickness can be between 0.2-0.4 mm.

[0059] Specifically, the damping plate 4 can be assembled with the support base plate 1 through the connector to ensure that the two can form a gap in the thickness direction, thereby preventing the setting of the damping plate 4 from having an adverse effect on the elastic range of the elastic support foil 3.

[0060] More specifically, the support base plate 1, the damping plate 4, and the top foil 2 can all be provided with multiple through holes. In this case, the support base plate 1, the damping plate 4, and the top foil 2 can be assembled using pins. Furthermore, based on the dimensions of the portion of the elastic support foil 3 protruding beyond the support platform 12 in the aforementioned thickness direction, the length of the pins can be designed accordingly so that after the support base plate 1 and the damping plate 4 are assembled, they can be spaced apart from each other, and the damping plate 4 can contact the elastic support foil 3. That is, in the hydrodynamic gas foil bearing disclosed in this application embodiment, there is a floating gap of a preset size between the damping plate 4 and the support base plate 1 in the thickness direction.

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

[0062] As described above, the wedge-shaped region 212 of the top foil 2 can form a wedge-shaped space. Since the bearing portion 21 is generally aligned with the elastic support foil 3, the bearing region 211 has already undergone relative displacement with respect to the support base plate 1 before the elastic support foil 3 deforms, thereby causing the wedge-shaped region 212 to undergo elastic deformation. Based on this, in order to prevent the wedge-shaped region 212 from undergoing excessive deformation and being unable to recover its deformation, leading to failure of the hydrodynamic gas foil bearing, in a specific embodiment of this 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 pieces 51, and the plurality of bearing pieces 51 correspond one-to-one with the plurality of bearing regions 211.

[0063] That is, in the hydrodynamic gas foil bearing disclosed in this application embodiment, a bearing plate 51 can be provided between any bearing area 211 and the damping plate 4. In this case, the bearing plate 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 force on the bearing part 21 can be minimized, so that the squeezing force can be transmitted to the elastic support foil 3 more quickly, which can further improve the reliability and continuity of the bearing part 21.

[0064] As described above, the bearing plate 5 is mounted on the vibration damping plate 4. Specifically, the two can be fixedly connected by welding or other means. To prevent the bearing area 211 from reducing its transmission effect on the compressive force during the compression of the vibration damping plate 4 and the elastic support foil 3 by the fixed connection between the bearing plate 51 and the vibration damping plate 4, in a specific embodiment of this application, the bearing plate 51 and the vibration damping plate 4 can only have a mutually limiting fit in the circumferential direction, while they can move relative to each other in the thickness direction of the plate 11. Of course, in this case, in order to ensure that each bearing plate 51 and the vibration damping plate 4 can be relatively fixed in the circumferential direction, optionally, each bearing plate 51 can be provided with two or more through holes. By installing a pin or other structure in each through hole and connecting the pin to the vibration damping plate 4, it can be ensured that each bearing plate 51 can form a relatively fixed relationship with the vibration damping plate 4 in the circumferential direction, without hindering the relative displacement or relative deformation of the bearing plate 51 and the vibration damping plate 4 in the thickness direction of the plate 11.

[0065] To reduce the overall installation difficulty of the multiple bearing plates 51, optionally, as shown in the figure, the bearing plate 5 may also include a connecting part 52. The connecting part 52 is mounted on the support base plate 1, and the connecting part 52 is a closed ring structure. The connecting part 52 is arranged around the outer periphery of the multiple bearing plates 51. In the radial direction of the connecting part 52, the end of each bearing plate 51 near the connecting part 52 is fixedly connected to the connecting part 52. In this case, by forming an assembly relationship between the connecting part 52 and the vibration damping plate 4, it can be 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 hydrodynamic gas foil bearing.

[0066] Meanwhile, in the hydrodynamic gas foil bearing disclosed in this application embodiment, the ends of each bearing piece 51 away from the connecting portion 52 can be free ends. In this case, each bearing piece 51 still has good deformation capacity, ensuring that the bearing piece 51 still has good transmission capacity of the extrusion force. Of course, during the processing, the connecting portion 52 and multiple bearing pieces 51 can be formed integrally to improve the connection reliability between each bearing piece 51 and the connecting portion 52. Furthermore, in order to reduce the probability of plastic deformation of the bearing piece 51, in this application embodiment, the thickness of the bearing piece 51 can be between 0.3-0.5 mm, which makes each bearing piece 51 have good support strength. Correspondingly, the thickness of the connecting portion 52 can also be the same as the thickness of the bearing piece 51 to reduce the processing difficulty of both and to ensure that the overall force uniformity of the top layer foil 2 is relatively good when it extrudes the bearing plate 5.

[0067] More specifically, in the case of the hydrodynamic gas foil bearing disclosed in this application embodiment, when no external force is applied, a relatively small gap can be made between the bearing area 211 and the corresponding bearing piece 51 along the thickness direction of the plate 11. In other embodiments of this application, the two can also be made to fit together in the aforementioned thickness direction. Of course, the bearing piece 51 and the vibration damping plate 4 are fitted together.

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

[0069] Of course, for the elastic support foil 3, in order to ensure a stable relative positional relationship between it and the support base plate 1, the elastic support foil 3 needs to be fixed to the support base plate 1 by means of welding or other methods. In order to minimize the weakening of the elasticity of the elastic support foil 3 by the fixing relationship between the two, in a specific embodiment of this application, the elastic support foil 3 can include an elastic protrusion 31 and a mounting plate 32 fixedly connected in the circumferential direction of the plate body 11. The elastic protrusion 31 is parallel to the edge of the first end and protrudes towards the top foil 2 to ensure that it has good deformation capacity in the circumferential direction. At the same time, by welding the mounting plate 32 to the plate body 11, the elastic protrusion 31 is indirectly fixed to the plate body 11 through the mounting plate 32, which can minimize the obstruction of the aforementioned welding fixing relationship to elastic deformation at any position on the elastic protrusion 31, thereby ensuring that the elastic deformation capacity at any position of the elastic protrusion 31 is relatively good.

[0070] Optionally, a weld extending radially along the plate 11 can be formed between the mounting plate portion 32 and the plate body 11. To further reduce the weakening effect of the welding relationship on the deformation capacity of the elastic protrusion 31, in another embodiment of this application, the mounting plate portion 32 can be provided with a plurality of weld points W, which are distributed radially at intervals along the plate body 11. More specifically, the plurality of weld points W on the mounting plate portion 32 can be evenly distributed. The spacing between the weld points W and the number of weld points W on each mounting plate portion 32 can be determined according to the overall dimensions of the hydrodynamic gas foil bearing. In a specific embodiment of this application, the number of weld points W on each mounting plate portion 32 is at least 6, and the spacing between the weld points W can be between 2-5 mm.

[0071] In addition, the elastic support foil 3 may also include a mating plate portion 33, which is connected to the end of the elastic protrusion 31 opposite to the mounting plate portion 32. Alternatively, in the circumferential direction of the plate body 11, one end of the elastic protrusion 31 is connected to the mating plate portion 33, and the other end is connected to the mounting plate portion 32. Under the action of the mounting plate portion 32, the contact area between the entire elastic support foil 3 and the plate body 11 can be increased. This reduces the relative force between the elastic protrusion 31 and the plate body 11 when the elastic protrusion 31 undergoes elastic deformation, making it easier for the elastic protrusion 31 to expand and deform, thus improving its elasticity. Of course, there is no limiting or connecting relationship between the mating plate portion 33 and the plate body 11.

[0072] Based on the hydrodynamic gas foil bearings provided in any of the above embodiments, this application also provides a rotating machine that includes any of the above-described hydrodynamic gas foil bearings. The rotating machine is, for example, a centrifugal compressor, a blower, etc. The hydrodynamic gas foil bearing included in the rotating machine can be, for example, a hydrodynamic gas foil thrust bearing, a hydrodynamic gas foil radial bearing, or both a hydrodynamic gas foil thrust bearing and a hydrodynamic gas foil radial bearing.

[0073] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0074] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0075] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or 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 to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A gas foil bearing of the dynamic pressure type, characterized in that, The support bottom plate (1), the top layer foil (2) and a plurality of elastic support foils (3) are included, wherein: The support bottom plate (1) includes a plate body (11) and a plurality of support tables (12), a plurality of the support tables (12) are fixed to one side of the plate body (11) along the circumference of the plate body (11), and each of the support tables (12) is arranged protruding relative to the plate body (11); The top layer foil (2) is installed on the side of the support table (12) away from the plate body (11), the top layer foil (2) is an integral annular structure, and the top layer foil (2) includes a plurality of bearing parts (21), a plurality of the bearing parts (21) correspond to a plurality of the elastic support foils (3) one by one, and any of the bearing parts (21) includes a first end and a second end arranged opposite along the circumference, and the first end and the second end gradually approach the plate body (1) from the side close to the circumferential middle of the bearing part (21) to the circumferential edge of the bearing part (21) along the circumference to form a wedge-shaped structure; Any two adjacent support tables (12) are provided with the elastic support foil (3), and in the circumferential direction, the middle part of the elastic support foil (3) is arranged protruding relative to the support tables (12) on both sides in the thickness direction of the plate body (11).

2. The dynamic gas foil bearing of claim 1 wherein, The bearing part (21) includes a bearing area (211) and a wedge-shaped area (212), the bearing area (211) is a flat plate structure, and corresponds to the elastic support foil (3), the bearing area (211) is arranged spaced apart from the elastic support foil (3) in the thickness direction, and the opposite sides of the bearing area (211) are provided with the wedge-shaped area (212) in the circumferential direction, and the wedge-shaped areas (212) on the opposite sides of any of the bearing areas (211) are arranged symmetrically relative to the circumferential direction.

3. The gas foil bearing of claim 2, wherein, The top layer foil (2) further includes a plurality of transition parts (22), the wedge-shaped areas (212) of any two adjacent bearing parts (21) are fixedly connected through the transition part (22), the transition part (22) is a flat plate structure, and a plurality of the transition parts (22) correspond to a plurality of support tables (12) one by one.

4. The dynamic gas foil bearing of claim 2 wherein, It also includes a damping flat plate (4), the damping flat plate (4) is an integral annular structure, the damping flat plate (4) is installed between the top layer foil (2) and the support table (12), and each of the elastic support foils (3) is arranged in contact with the damping flat plate (4).

5. The gas foil bearing of claim 4, wherein, It also includes a bearing flat plate (5), the bearing flat plate (5) is installed on the side of the damping flat plate (4) facing the top layer foil (2), and the bearing flat plate (5) includes a plurality of bearing pieces (51), a plurality of the bearing pieces (51) correspond to a plurality of the bearing areas (211) one by one.

6. The gas foil bearing of claim 5, wherein, The bearing flat plate (5) further comprises a connecting part (52) mounted on the support bottom plate (1), the connecting part (52) is a closed ring structure, the connecting part (52) is arranged around the outer periphery of the plurality of bearing pieces (51), in the radial direction of the connecting part (52), one end of each of the bearing pieces (51) close to the connecting part (52) is fixedly connected with the connecting part (52), and the other end of each of the bearing pieces (51) away from the connecting part (52) is a free end.

7. The gas foil bearing of claim 4 wherein, The support bottom plate (1), the damping flat plate (4) and the top foil (2) are all provided with a plurality of through holes to assemble the support bottom plate (1), the damping flat plate (4) and the top foil (2) by means of pins, and there is a floating gap between the damping flat plate (4) and the support bottom plate (1) in the thickness direction.

8. The gas foil bearing of claim 1 wherein, In the circumferential direction, one end of each of the elastic support foils (3) is fixedly connected with the plate body (11), and the other end is a free end, and is arranged in a spaced manner with the adjacent support platform (12).

9. The gas foil bearing of claim 8, wherein, In the circumferential direction, the elastic support foil (3) comprises a fixedly connected elastic protruding part (31) and an assembly flat plate part (32), the elastic protruding part (31) is parallel to the edge of the first end and protrudes towards the top foil (2), and the assembly flat plate part (32) is welded and fixed with the plate body (11).

10. A rotary machine characterized by, A dynamic pressure gas foil bearing comprising any one of claims 1 to 9. A dynamic pressure gas foil bearing comprising any one of claims 1 to 9.

Images