CN215928134U - Split air foil thrust bearing - Google Patents
Split air foil thrust bearing Download PDFInfo
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- CN215928134U CN215928134U CN202122548124.1U CN202122548124U CN215928134U CN 215928134 U CN215928134 U CN 215928134U CN 202122548124 U CN202122548124 U CN 202122548124U CN 215928134 U CN215928134 U CN 215928134U
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Abstract
The utility model discloses a separated air foil thrust bearing, relates to the technical field of air bearings, and particularly relates to an air foil thrust bearing capable of bearing a certain axial load. The bearing is formed by sequentially superposing a flat foil, a bearing cushion block, a corrugated foil and a bearing seat from top to bottom and assembling the flat foil, the bearing cushion block, the corrugated foil and the bearing seat through screws; the flat foil is of an integrated annular structure, N supporting surfaces are uniformly arranged on the flat foil, and each supporting surface is in an annular sector shape; the bearing cushion block is of an integrated annular structure, and N supporting cushion blocks are uniformly distributed on the inner side of the circumference of the bearing cushion block; the corrugated foil is of an integrated annular structure, and N corrugated bulges and N height compensation cushion blocks are arranged on the inner side of the circumference of the corrugated foil; the bearing seat is of an integrated annular structure. The technical scheme of the utility model solves the problems that the air foil bearing in the prior art is complex in structure, difficult to process and manufacture, too fast in temperature rise in the bearing operation process, uneven in distribution of air film pressure along the radius direction of the bearing, serious in abrasion of the foil surface and the like.
Description
Technical Field
The utility model discloses a separated air foil thrust bearing, relates to the technical field of air bearings, and particularly relates to an air foil thrust bearing capable of bearing a certain axial load.
Background
In modern industry, bearings are widely applied to various rotary machines as supporting parts, rolling bearings and sliding bearings are lubricated by lubricating oil or lubricating grease, the lubricating oil or the lubricating grease is volatile and goes bad under high-temperature conditions, so that the bearings can only be used in environments with lower temperature or lower rotating speed, gas foil bearings are novel bearings using air or other gases as lubricating media, and have the advantages of high working rotating speed, small friction and wear, no pollution, long service life, strong adaptability to high and low temperature environments and the like, and are widely applied to the fields of low-temperature refrigeration, aerospace, automobile industry and the like.
The hydrodynamic gas foil bearing is a self-acting flexible hydrodynamic gas bearing which takes a flat foil and a corrugated foil as supporting planes, generates a lubricating gas film through viscous drag torque between two solid surfaces which move mutually and between lubricating gas and an elastic element in the bearing, and is used for supporting load. The gas foil bearing mainly comprises a radial gas foil bearing and a thrust foil bearing, wherein the radial gas foil bearing mainly aims at improving the stability and the shock resistance of the bearing in a high-speed running state, and the dynamic gas thrust foil bearing mainly aims at greatly improving the axial bearing capacity of the bearing in the actual bearing process.
The theory and technology of the dynamic pressure gas foil bearing relate to the fields of materials science, structural mechanics, heat transfer science, manufacturing technology science, tribology and the like, and are a relatively complex multidisciplinary cross problem. The air foil bearing is relatively difficult to machine and manufacture due to the complex structural characteristics, the foil with a reasonable structure is designed and manufactured, and the preconditions of the foil bearing applied to the actual engineering are solved for solving the problems of the foil machining and manufacturing process and the foil surface coating. In recent years, air thrust foil bearings have evolved largely around the development of improvements to existing support structures and the development of new support structure designs. By modifying the dynamic pressure gas thrust foil bearing, simplifying the bearing structure and improving the axial bearing capacity of the air foil thrust bearing, the problems of over-fast temperature rise of the bearing in the high-speed operation process and serious abrasion in the operation process of the bearing are solved, and the improvement of the overall performance of the bearing and the further application in the industrial field are very necessary.
In view of the above problems in the prior art, it is necessary to develop a new split air foil thrust bearing to overcome the problems in the prior art.
Disclosure of Invention
According to the technical problems that the air foil bearing provided by the prior art is complex in structure, difficult to process and manufacture, too fast in temperature rise in the bearing operation process, uneven in distribution of air film pressure along the radius direction of the bearing, serious in abrasion of the surface of the foil and the like, the separated air foil thrust bearing is provided. The bearing is more convenient to process and assemble by mainly utilizing the screw to match with the U-shaped hole; the utility model provides two kinds of ripple foil structures, all leave cooling channel between these two kinds of ripple foil ripple archs, this cooling channel can effectively improve the heat transfer ability of bearing, solves the temperature rise by a wide margin of bearing in the operation in-process, and cooling channel can also solve the problem that the bearing distributes unevenly along radius direction pressure simultaneously.
The technical means adopted by the utility model are as follows:
a separated air foil thrust bearing is formed by sequentially superposing a flat foil, a bearing cushion block, a corrugated foil and a bearing seat from top to bottom and assembling the flat foil, the bearing cushion block, the corrugated foil and the bearing seat through screws;
furthermore, the flat foil is of an integrated annular structure, N supporting surfaces are uniformly arranged on the flat foil, and each supporting surface is in an annular sector shape;
furthermore, the bearing cushion block is of an integrated annular structure, and N supporting cushion blocks are uniformly distributed on the inner side of the circumference of the bearing cushion block;
furthermore, the corrugated foil is of an integrated annular structure, and N corrugated bulges and N height compensation cushion blocks are arranged on the inner side of the circumference of the corrugated foil;
further, the bearing seat is of an integrated annular structure.
Further, the inner diameter and the outer diameter of the flat foil, the bearing cushion block, the corrugated foil and the bearing seat are the same;
furthermore, at least three U-shaped holes are uniformly distributed on the outer circle shaft sides of the flat foil, the bearing cushion block, the corrugated foil and the bearing seat and used for assembling the flat foil, the bearing cushion block, the corrugated foil and the bearing seat in a mode of matching the screws with the U-shaped holes.
Furthermore, the projection sizes of the supporting cushion block and the height compensation cushion block are the same, and the supporting cushion block and the height compensation cushion block are assembled in an up-and-down alignment mode.
Furthermore, the fan-shaped angle between two adjacent height compensation cushion blocks is 1-2 degrees larger than the fan-shaped angle of one supporting surface. The corrugated foil height compensating cushion block is used for compensating the height difference between the bearing cushion block and the bearing seat, which is generated by the existence of the outer circumference side of the corrugated foil.
Furthermore, the surfaces of the flat foil and the corrugated foil need to be sprayed with polytetrafluoroethylene abrasion-resistant coatings. The polytetrafluoroethylene coating has the characteristics of high temperature resistance and friction resistance, has a good protection effect on the surfaces of the flat foil and the corrugated foil, and can weaken the surface abrasion of the bearing in the running process, thereby prolonging the service life of the bearing.
Further, the corrugated protrusions have two forms, one of which is a strip-shaped protrusion leaving cooling channels in the radial direction, and the other of which is an annular protrusion leaving cooling channels in the circumferential direction. This cooling channel makes the paper tinsel arch on the adjacent foil strip stagger each other, disconnect-type foil is all changeable along radial direction and circumferencial direction rigidity, this kind of rigidity characteristic helps the bearing to adapt to the pressure uneven distribution that leads to along the difference of radius direction linear velocity, thereby can the homogenization pressure, coordinate the foil deformation, improve bearing carrying capacity, this cooling channel can effectively improve the heat transfer ability of bearing simultaneously, solve the temperature rise by a wide margin of bearing in the operation in-process, the ripple foil of integration has simultaneously solved the bearing and has stopped the easy fatigue fracture's of easy problem of ripple foil stiff end junction in-process many times.
Furthermore, after the air foil thrust bearing is assembled, the flat foil is tightly attached to the corrugated foil, a certain height difference exists between the support cushion block of the bearing cushion block and the corrugated protrusion of the corrugated foil, the vertical height difference forms an inclined plane required by fluid dynamic pressure lubrication on the surface of the flat foil, a wedge-shaped gap is formed between the inclined surface of the bearing elastic support element and the thrust disk, lubricating gas with certain viscosity is arranged in the wedge-shaped gap, and when the motion between the solid surfaces drives the lubricating gas to move from the large end of the gap to the small end of the gap, gas film pressure is generated to bear certain external load, so that certain axial supporting force is provided. The circumferential clearance between the height compensation cushion block of the corrugated foil and the corrugated protrusions determines the proportion of the inclined section area to the fan-shaped bearing surface.
Furthermore, after the bearing is assembled, the flat foil supporting surface and the corrugated protrusions of the corrugated foil form an elastic supporting surface, when the bearing runs at a high speed, the elastic supporting surface can deform to a certain extent under the action of air film pressure to provide certain rigidity and damping, and the bearing can generate different air film thicknesses in the running process to meet the requirements of different running conditions.
Compared with the prior art, the utility model has the following advantages:
1. compared with the traditional air foil thrust bearing, the split air foil thrust bearing provided by the utility model has the advantages that the flat foil and the corrugated foil are of an integrated structure, and the bearing is assembled in a screw and U-shaped hole matching mode, so that the assembly mode of the existing air foil thrust bearing is simpler and more convenient, and the fixing effect is better;
2. according to the separated air foil thrust bearing provided by the utility model, the corrugated foil is of an integrated structure, so that the problem that the joint of the fixed ends of the corrugated foils of the traditional air foil thrust bearing is easy to fatigue fracture can be effectively solved;
3. the utility model provides a separated air foil thrust bearing, which provides two structural forms of corrugated foils, wherein the corrugated bulges of the corrugated foils are provided with cooling channels, the cooling channels enable foil arches on adjacent foil strips of the corrugated bulges to be mutually staggered, the rigidity of the corrugated foil bulges in the circumferential direction and the radial direction can be changed due to the existence of the cooling channels, and the rigidity characteristic of the corrugated foils is beneficial to the bearing to adapt to uneven pressure distribution caused by linear velocity difference in the radial direction, so that the pressure can be homogenized, the foil deformation can be coordinated, the rigidity change range of the bearing can be expanded, and the bearing capacity of the bearing can be improved. On the other hand, the existence of the cooling channel can effectively improve the heat exchange capability of the bearing, avoid thermal deformation caused by uneven temperature distribution and enable the bearing to adapt to a small amount of axial deflection;
4. the separated air foil thrust bearing provided by the utility model is different from the traditional oil lubrication thrust bearing, the air is used as the lubricant, the air plays roles of lubrication and heat dissipation, the air film force generated by the gas dynamic pressure effect can provide a certain axial supporting force, and compared with the traditional oil lubrication thrust bearing, the separated air foil thrust bearing does not need an oil supply device, reduces the whole weight of the thrust bearing and has higher reliability.
In conclusion, the technical scheme of the utility model solves the problems that the air foil bearing in the prior art is complex in structure, difficult to process, manufacture and assemble, too fast in temperature rise in the bearing operation process, uneven in distribution of air film pressure along the radius direction of the bearing, easy to fatigue fracture of a corrugated foil, serious in surface abrasion of the foil and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is an exploded view of a corrugated foil of the present invention in a ribbon configuration;
FIG. 2 is an exploded view of the corrugated foil of the present invention in a ring-shaped configuration;
FIG. 3 is an isometric view of a flat foil;
FIG. 4 is an isometric view of a bearing pad;
FIG. 5 is an isometric view of a strip-shaped corrugated foil;
FIG. 6 is an isometric view of an annular corrugated foil;
FIG. 7 is a schematic view of a corrugated projection arrangement;
figure 8 is an isometric view of the bearing block.
In the figure: 1. the bearing comprises a flat foil 11, a supporting surface 2, a bearing cushion block 21, a supporting cushion block 3, a corrugated foil 31, a height compensation cushion block 32, a corrugated protrusion 33, a cooling channel 4, a bearing seat 5 and a U-shaped hole.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in fig. 1 and 2, a novel split air foil thrust bearing comprises a flat foil 1, a bearing pad 2, a corrugated foil 3 and a bearing seat 4; the flat foil and the corrugated foil are all of an integrated annular structure, and the flat foil, the bearing cushion block and the corrugated foil are assembled on the bearing seat in a screw pre-tightening mode from top to bottom to form a complete assembly body.
As shown in FIG. 3, the structure of the novel separated air foil thrust bearing flat foil is schematically shown, a flat foil supporting surface is in direct contact with the surface of a rotor disc, an elastic lubricating plane is provided during the operation of the bearing, and meanwhile, a wedge-shaped area of a hydrodynamic pressure effect is formed by an inclined section area and a flat section area of the flat foil supporting surface, and is used for forming a lubricating air film. The flat foil material is nickel 718 alloy with the thickness of 0.1mm-0.2mm, and the nickel 718 alloy has the advantages of easy processing, good mechanical property, high-temperature oxidation resistance and better welding property compared with other alloys. The U-shaped holes in the flat foil support surface and the outer circumferential side are machined by slow-feed wire cutting. The number of the effective supporting surfaces of the flat foil can be 3, 4, 6 or 9, and the effective supporting surfaces can be selected according to the bearing requirements in the actual processing process, and only the supporting surfaces are required to be uniformly arranged in the circumferential direction. Before the flat foil is assembled, a polytetrafluoroethylene wear-resistant coating is sprayed on the flat foil, the wear-resistant coating has good wear resistance, and the wear of the surface of the flat foil caused by dry friction in the starting and stopping stages of the bearing can be reduced.
As shown in FIG. 4, the structure of the bearing pad block of the novel split-type air foil thrust bearing is schematically shown, the bearing pad block is located between the flat foil and the corrugated foil during assembly, the material of the bearing pad block is 3Cr2Mo die steel, and the die steel has the characteristics of good comprehensive performance, high strength, high elastic modulus, small thermal expansion coefficient and the like. The bearing cushion block is used for compensating the height difference between the fixed end of the supporting surface of the corrugated flat foil and the corrugated bulge of the corrugated foil, so that the height of the formed inclined section area is below 100 micrometers. The number of the bearing cushion block supporting cushion blocks is consistent with that of the effective supporting surfaces of the flat foils.
As shown in fig. 5 and 6, in the structural schematic diagram of the novel split-type air foil thrust bearing corrugated foil, the corrugated protrusions of the corrugated foil are below the flat foil supporting surface and are tightly attached to the flat foil supporting surface under the action of the air film pressure, and the corrugated protrusions of the corrugated foil are main components for providing supporting rigidity for the bearing in the actual bearing process. N height compensation cushion blocks and N corrugated bulges are uniformly arranged on the inner side of the circumference of the corrugated foil; the number of the height compensation cushion blocks and the corrugated protrusions is consistent with the number of the effective supporting surfaces of the flat foil, the projection sizes of the single height compensation cushion block and the bearing cushion block are consistent, the area of the single height compensation cushion block and the single corrugated protrusion is consistent with the area of the single effective supporting surface of the flat foil, a certain angle is reserved between the height compensation cushion block and the corrugated protrusion, the size of the angle mainly determines the proportion of an inclined section area and a section area of the effective supporting surface of the flat foil, the proportion is expressed by a pitch ratio, the size of the pitch ratio can be 0.2, 0.3, 0.4, 0.5 and 0.6, and the height compensation cushion block and the corrugated protrusion can be selected according to bearing requirements in the actual processing process. The corrugated bulges of the corrugated foil have two structural forms, one is strip-shaped corrugated bulges, the other is annular-strip-shaped corrugated bulges, the strip-shaped corrugated bulges are provided with cooling channels in the radial direction, the annular-strip-shaped corrugated bulges are provided with cooling channels in the circumferential direction, the cooling channels can coordinate the deformation of the corrugated foil to homogenize the pressure on the surface of the bearing, meanwhile, the air flow of the foil in the high-speed running process is enhanced, the heat exchange capacity of the bearing is effectively improved, the corrugated foil is made of nickel 718 alloy and has the thickness of 0.1mm-0.2mm, and the corrugated foil is processed in a slow-walking wire cutting mode to obtain the non-punch-formed corrugated foilThe corrugated bulges are obtained by stamping through a die, and the structural schematic diagram of the corrugated bulges after stamping is shown in figure 7, wherein h isbIs the height of the corrugation ridge, tbIs the thickness of the corrugated foil, l is the half-wave foil length, and s is the wave foil unit length. The parameter ranges for the dimensions of the corrugated foil structure are shown in table 1. The size of the corrugated foil stamping die can be designed according to actual requirements when the corrugated protrusions are stamped. The wave foil after stamping has poor elasticity, and the aging treatment and strengthening treatment are required to recover the elastic property and fatigue strength of the wave foil. The aging treatment is double aging heat treatment, the specific embodiment scheme is that the temperature is kept for 8 hours at 720 degrees, the furnace is cooled to 620 degrees at the speed of 50 degrees/h and the temperature is kept for 8 hours, and finally the temperature is reduced to the room temperature in an air cooling mode. The polytetrafluoroethylene wear-resistant coating is sprayed on the surface of the corrugated foil after the heat treatment, has good adsorbability and good wear resistance, and can effectively reduce the wear of the foil caused by the dry friction of the bearing in the high-speed operation process, thereby prolonging the service life of the bearing.
TABLE 1 foil thrust bearing corrugated foil structure dimensional parameters
As shown in FIG. 8, the novel separated air foil thrust bearing seat is a schematic structural diagram, and the bearing seat provides a foundation for fixing and installing the bearing. The bearing seat is made of 3Cr2Mo die steel, the thickness of the bearing seat is 1-2 mm, and the bearing seat is machined in a slow wire cutting mode. The inner and outer diameter sizes of the bearing seat are consistent with those of the flat foil, the bearing cushion block and the corrugated foil.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A split air foil thrust bearing, characterized by:
the separated air foil thrust bearing is formed by sequentially superposing a flat foil (1), a bearing cushion block (2), a corrugated foil (3) and a bearing seat (4) from top to bottom and assembling the flat foil, the bearing cushion block, the corrugated foil and the bearing seat through screws;
the flat foil (1) is of an integrated annular structure, N supporting surfaces (11) are uniformly arranged on the flat foil, and each supporting surface (11) is in an annular sector shape;
the bearing cushion block (2) is of an integrated annular structure, and N supporting cushion blocks (21) are uniformly distributed on the inner side of the circumference of the bearing cushion block;
the corrugated foil (3) is of an integrated annular structure, and N corrugated bulges (32) and N height compensation cushion blocks (31) are arranged on the inner side of the circumference of the corrugated foil;
the bearing seat (4) is of an integrated annular structure.
2. The split air foil thrust bearing of claim 1, wherein:
the inner diameter and the outer diameter of the flat foil (1), the bearing cushion block (2), the corrugated foil (3) and the bearing seat (4) are the same;
the bearing is characterized in that at least three U-shaped holes are uniformly distributed on the outer circle shaft side of the flat foil (1), the bearing cushion block (2), the corrugated foil (3) and the bearing seat (4) and used for assembling the flat foil (1), the bearing cushion block (2), the corrugated foil (3) and the bearing seat (4) in a mode of being matched with the U-shaped holes (5) through screws.
3. The split air foil thrust bearing of claim 1, wherein:
the projection sizes of the supporting cushion block (21) and the height compensation cushion block (31) are the same, and the supporting cushion block and the height compensation cushion block are assembled in an up-and-down alignment mode.
4. The split air foil thrust bearing of claim 1, wherein:
the fan-shaped angle between two adjacent height compensation cushion blocks (31) is 1-2 degrees larger than the fan-shaped angle of one supporting surface (11).
5. The split air foil thrust bearing of claim 1, wherein:
the surfaces of the flat foil (1) and the corrugated foil (3) need to be sprayed with polytetrafluoroethylene anti-wear coatings.
6. The split air foil thrust bearing of claim 4, wherein:
the corrugated bulges (32) have two forms, one is in a strip shape and is provided with cooling channels (33) in the radial direction, and the other is in an annular strip shape and is provided with cooling channels (33) in the circumferential direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122548124.1U CN215928134U (en) | 2021-10-21 | 2021-10-21 | Split air foil thrust bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122548124.1U CN215928134U (en) | 2021-10-21 | 2021-10-21 | Split air foil thrust bearing |
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| CN215928134U true CN215928134U (en) | 2022-03-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263912A (en) * | 2022-07-30 | 2022-11-01 | 广东美的暖通设备有限公司 | Axial bearing, compressor and heating and ventilation equipment |
| CN115539501A (en) * | 2022-11-30 | 2022-12-30 | 天津飞旋科技股份有限公司 | Elastic lamination assembly, foil dynamic pressure thrust bearing and rotating mechanical shaft system |
-
2021
- 2021-10-21 CN CN202122548124.1U patent/CN215928134U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263912A (en) * | 2022-07-30 | 2022-11-01 | 广东美的暖通设备有限公司 | Axial bearing, compressor and heating and ventilation equipment |
| CN115539501A (en) * | 2022-11-30 | 2022-12-30 | 天津飞旋科技股份有限公司 | Elastic lamination assembly, foil dynamic pressure thrust bearing and rotating mechanical shaft system |
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