CN114233746A - Dynamic pressure gas thrust bearing - Google Patents
Dynamic pressure gas thrust bearing Download PDFInfo
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- CN114233746A CN114233746A CN202111573058.1A CN202111573058A CN114233746A CN 114233746 A CN114233746 A CN 114233746A CN 202111573058 A CN202111573058 A CN 202111573058A CN 114233746 A CN114233746 A CN 114233746A
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- foil
- gaskets
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- fixing plate
- thrust bearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/042—Sliding-contact bearings for exclusively rotary movement for axial load only with flexible leaves to create hydrodynamic wedge, e.g. axial foil bearings
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- General Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Support Of The Bearing (AREA)
Abstract
The invention discloses a dynamic pressure gas thrust bearing which comprises a bearing bottom plate, elastic supporting gaskets, a fixing plate, foil gaskets and top foil, wherein the elastic supporting gaskets are laid on the front surface of the bearing bottom plate, supporting intervals are arranged between every two adjacent elastic supporting gaskets, the fixing plate is laid on the front surface of the elastic supporting gaskets, the foil gaskets are laid on the front surface of the fixing plate, foil intervals are arranged between every two adjacent foil gaskets, the foil gaskets are sequentially opposite to the corresponding supporting intervals, the top foil is laid on the front surface of the fixing plate, the fixed end of each top foil in the same direction penetrates through the corresponding foil interval and is fixedly connected with the front surface of the fixing plate, and the free end of each top foil is lapped on the front surface of the corresponding foil gasket. The bearing structure is greatly simplified, all parts are plane foils, the bearing structure is simple, the bearing manufacturability is good, the process is single, batch automatic production is facilitated, the processing difficulty is reduced, the processing cost is reduced, the yield is improved, and the technical popularization and application are facilitated.
Description
Technical Field
The invention relates to the field of gas bearings, in particular to a dynamic pressure gas thrust bearing.
Background
The dynamic pressure gas thrust bearing is based on the basic principle of fluid dynamic pressure lubrication, takes environmental gas as a lubricating medium, and generates a high-pressure gas film on the surface of the bearing through a dynamic pressure effect to realize the ultrahigh-speed bearing with a completely suspended rotating shaft. The main structure of the dynamic pressure gas thrust bearing comprises a top layer foil, a wave foil and a bearing bottom plate.
Compared with the traditional rolling and sliding bearing, the sliding bearing has a series of advantages of high rotating speed, good precision, high reliability, oil-free lubrication, small friction loss, capability of working in a high-temperature environment and the like. The method has wide application prospect in the fields of aerospace, national defense war industry, civil fluid machinery and the like, and comprises an oil-free centrifugal blower, a fuel cell air compressor, a waste heat recovery generator, a refrigeration compressor, a micro gas turbine and the like.
In the prior art, the bump foil and the top foil form the compliant bearing surface of the foil gas bearing. After the bearing takes off, the flexibility of the surface of the bearing can improve the shock resistance and the non-centering adaptation capability of the bearing to a certain extent through elastic deformation, and the failure of the bearing is avoided. Under normal working conditions, the deformation of the foil structure and a pressure field inside the bearing reach dynamic balance, and relative sliding exists between the bump foil and the top foil as well as between the bump foil and the thrust baseplate, so that friction force is generated. The friction of the contact surfaces generates heat, which results in energy loss and provides some damping for the bearing.
However, the existing bearing has a complex structure, a plurality of complex curved surface parts exist, various different types of parts are mutually overlapped and assembled, the bearing structure is not simple enough, the manufacturability is poor, the bearing processing process flow is complex, and the automatic production of batch processing is not facilitated.
Therefore, how to provide a dynamic pressure gas thrust bearing with a simple structure and convenient processing is a technical problem which needs to be solved by the technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a dynamic pressure gas thrust bearing, which greatly simplifies the bearing structure, adopts plane foils for all parts, has simple bearing structure, good bearing manufacturability and single process, is favorable for batch automatic production, reduces the processing difficulty and the processing cost, improves the yield, and is favorable for technical popularization and application.
In order to solve the technical problems, the invention provides a dynamic pressure gas thrust bearing, which comprises a bearing bottom plate, elastic support gaskets, a fixed plate, foil gaskets and a top layer foil, wherein the elastic support gaskets are sequentially laid on the front surface of the bearing bottom plate along the circumferential direction and surround and avoid a central through hole of the bearing bottom plate, a support interval is arranged between every two adjacent elastic support gaskets, the fixed plate is laid on the front surface of each elastic support gasket, the foil gaskets are sequentially laid on the front surface of the fixed plate along the circumferential direction and surround and avoid the central through hole of the fixed plate, a foil interval is arranged between every two adjacent foil gaskets, each foil gasket is sequentially opposite to the corresponding support interval, the top layer foil is sequentially laid on the front surface of the fixed plate along the circumferential direction and surrounds and avoids the central through hole of the fixed plate, the fixed ends of the top foil sheets in the same direction penetrate through the corresponding foil sheets to be fixedly connected with the front surface of the fixing plate at intervals, and the free ends of the top foil sheets are lapped on the front surface of the corresponding foil sheet gasket.
Preferably, the top foil is a sector plate with an avoidance notch arranged at the circle center, and the top foils are spliced into an annular structure.
Preferably, the foil gasket is a sector plate with avoiding gaps arranged at the circle center, and the foil intervals are sector gaps.
Preferably, the elastic support gasket is a sector plate provided with an avoidance notch at the circle center, and the support interval is a sector notch.
Preferably, the periphery of each elastic support gasket is connected with the inner side of the first annular positioning plate, and the periphery of each foil gasket is connected with the inner side of the second annular positioning plate.
Preferably, the bearing bottom plate and the fixing plate are annular plates.
Preferably, the bearing bottom plate, the elastic support gasket splicing structures, the fixing plate, the foil gasket splicing structures and the top foil splicing structures are coaxially arranged, and a through hole is formed in the middle of the bearing bottom plate.
Preferably, the width of the foil gasket is smaller than that of the support interval, and the outer diameter of the annular structure spliced by the top foil is smaller than that of the bearing bottom plate.
Preferably, the diameters of the peripheries of the bearing bottom plate, the first annular positioning plate, the fixing plate and the second annular positioning plate are the same, a plurality of positioning openings which are uniformly distributed are formed in the periphery of each plate, and the positioning openings of the plates are opposite to each other and are inserted into positioning pieces.
Preferably, the positioning opening is an open pin hole with an outward opening, and the positioning piece is a pin or a bolt.
The invention provides a dynamic pressure gas thrust bearing, which comprises a bearing bottom plate, elastic supporting gaskets, a fixed plate, foil gaskets and top foil sheets, wherein the elastic supporting gaskets are sequentially laid on the front surface of the bearing bottom plate along the circumferential direction and surround and avoid a central through hole of the bearing bottom plate, supporting intervals are arranged between adjacent elastic supporting gaskets, the fixed plate is laid on the front surfaces of the elastic supporting gaskets, the foil gaskets are sequentially laid on the front surface of the fixed plate along the circumferential direction and surround and avoid the central through hole of the fixed plate, foil intervals are arranged between the adjacent foil gaskets, each foil gasket is sequentially opposite to the corresponding supporting interval, the top foil sheets are sequentially laid on the front surface of the fixed plate along the circumferential direction and surround and avoid the central through hole of the fixed plate, and the fixed ends of the top foil sheets in the same direction penetrate through the corresponding foil intervals and are fixedly connected with the front surface of the fixed plate, the free end of each top foil overlaps the front face of the corresponding foil spacer.
A wedge-shaped structure and an elastic supporting structure of the gas thrust bearing are formed by utilizing a method that a plurality of layers of plane foils with different shapes are overlapped, when the bearing works, a thrust disc matched with the bearing sucks ambient gas into a wedge-shaped gap of a top layer foil, and the gas compressed by the wedge-shaped gap forms a high-pressure gas film, so that the thrust disc is completely suspended in the air.
Compared with the traditional wave foil type thrust bearing, the scheme provided by the invention can ensure that the top layer foil can still keep a uniform and consistent wedge-shaped air film when the bearing load fluctuates in a larger range, and can obviously improve the bearing performance. The bearing structure is greatly simplified, all parts are plane foils, the bearing structure is simple, the bearing manufacturability is good, the process is single, batch automatic production is facilitated, the processing difficulty is reduced, the processing cost is reduced, the yield is improved, and the technical popularization and application are facilitated.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of a hydrodynamic gas thrust bearing provided by the present invention;
FIG. 2 is an exploded view of one embodiment of a hydrodynamic gas thrust bearing provided by the present invention;
FIG. 3 is a layered end view of one embodiment of a hydrodynamic gas thrust bearing provided by the present invention.
Detailed Description
The core of the invention is to provide the dynamic pressure gas thrust bearing, which greatly simplifies the bearing structure, all parts adopt plane foils, the bearing structure is simple, the bearing manufacturability is good, the process is single, the invention is beneficial to batch automatic production, the processing difficulty and the processing cost are reduced, the yield is improved, and the invention is beneficial to technical popularization and application.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a dynamic pressure gas thrust bearing according to an embodiment of the present invention; FIG. 2 is an exploded view of one embodiment of a hydrodynamic gas thrust bearing provided by the present invention; FIG. 3 is a layered end view of one embodiment of a hydrodynamic gas thrust bearing provided by the present invention.
The invention provides a dynamic pressure gas thrust bearing, which comprises a bearing bottom plate 1, an elastic support gasket 2, a fixing plate 3, a foil gasket 4 and a top layer foil 5, wherein the front surface and the back surface of each plate are sequentially attached, the bearing bottom plate 1 is fixed on a bearing seat, the top layer foil 5 is close to a thrust disc, one surface of each plate close to the thrust disc is the front surface, and one surface of each plate close to the bearing seat is the back surface. Wherein, the middle parts of the bearing bottom plate 1 and the fixed plate 3 are both provided with a central through hole for the rotating shaft to pass through. A plurality of elastic support gaskets 2 are laid in the front of the bearing bottom plate 1 along the circumferential direction in sequence, a plurality of elastic support gaskets 2 are arranged around the central through hole of the bearing bottom plate 1, the inner end of each elastic support gasket 2 avoids the central through hole, the rotating shaft can smoothly pass through the rotating shaft, a support interval is arranged between every two adjacent elastic support gaskets 2, namely, the elastic support gaskets 2 are arranged in a radioactive mode, a plurality of support intervals arranged around the central through hole are formed, the elastic support gaskets 2 can be evenly arranged, and then a plurality of support intervals formed are also evenly arranged.
Further, the fixing plate 3 is laid on the front surface of the elastic support pad 2 to cover the whole elastic support pad 2. A plurality of foil spacers 4 are laid in fixed plate 3 openly along the circumferencial direction in proper order, make a plurality of foil spacers 4 around the central through hole of fixed plate 3, the central through hole is dodged to each 4 inner of foil spacer simultaneously, make the pivot pass smoothly, be provided with the foil interval between the adjacent foil spacer 4, a plurality of foil spacers 4 are the radioactivity and arrange promptly, a plurality of foil intervals around the central through hole have been formed, can make a plurality of foil spacers 4 evenly arrange, and then a plurality of foil intervals that form also evenly arrange.
Meanwhile, the support intervals and the foil intervals are staggered, namely, each foil gasket 4 is opposite to the corresponding support interval in sequence, and each elastic support gasket 2 is opposite to the corresponding foil interval in sequence, so that the same number of elastic support gaskets 2 and foil gaskets 4 are required to be arranged.
A plurality of top layer foil 5 are laid in proper order in fixed plate 3 openly along the circumferencial direction, make a plurality of top layer foil 5 around the central through hole of fixed plate 3, the central through hole is dodged to each top layer foil 5 inner simultaneously, make the pivot can pass smoothly, set up the top layer foil 5 with foil gasket 4 equal quantity, top layer foil 5 is the stiff end along the one end of circumferential direction, the other end along the circumferential direction is the expansion end, and the stiff end of each top layer foil 5 all is located same direction, top layer foil 5 centers on the back promptly, the expansion end of first top layer foil 5 is close to the stiff end of next top layer foil 5, the expansion end of until last top layer foil 5 is close to the stiff end of first top layer foil 5. The fixed end of each top foil 5 penetrates through the corresponding foil to be fixedly connected to the front surface of the fixed plate 3 at intervals, and the free end of each top foil 5 is lapped on the front surface of the corresponding foil gasket 4. Namely, one adjacent foil interval and one foil gasket 4 are matched with one top foil 5, and the top foil 5 can completely cover the corresponding foil interval and the corresponding foil gasket 4, so that the free end of the top foil 5 is tilted by a certain height relative to the fixed end, a wedge-shaped structure is formed, and a high-pressure air film is favorably formed.
A wedge-shaped structure and an elastic supporting structure of the gas thrust bearing are formed by utilizing a method that a plurality of layers of plane foils with different shapes are mutually overlapped, when the bearing works, a thrust disc matched with the bearing sucks ambient gas into a wedge-shaped gap of the top foil 5, and the gas compressed by the wedge-shaped gap forms a high-pressure gas film, so that the thrust disc is completely suspended in the air.
Compared with the traditional wave foil type thrust bearing, the scheme provided by the invention can ensure that the top layer foil can still keep a uniform and consistent wedge-shaped air film when the bearing load fluctuates in a larger range, and can obviously improve the bearing performance. The bearing structure is greatly simplified, all parts are plane foils, the bearing structure is simple, the bearing manufacturability is good, the process is single, batch automatic production is facilitated, the processing difficulty is reduced, the processing cost is reduced, the yield is improved, and the technical popularization and application are facilitated.
Specifically, the top foil 5 is a sector plate with an avoidance notch arranged at the center of the circle, and the top foils 5 are spliced into an annular structure. The foil gasket 4 is a sector plate with a circle center provided with an avoiding gap, the foil interval is a sector gap, and the foil gasket 4 and the foil are spliced into an annular structure at intervals. The elastic supporting gasket 2 is a sector plate with avoiding gaps at the circle center, the supporting intervals are sector gaps, and the elastic supporting gasket 2 and the supporting intervals are spliced into an annular structure. The structural shapes of the components can be adjusted according to the situation and are all within the protection scope of the invention.
In the dynamic pressure gas thrust bearing according to the embodiment of the present invention, in order to fix each of the elastic support shims 2 and the foil shims 4, a first annular positioning plate and a second annular positioning plate are required, the outer periphery of each of the elastic support shims 2 is connected to the inner side of the first annular positioning plate, and the outer periphery of each of the foil shims 4 is connected to the inner side of the second annular positioning plate, thereby forming two inner tooth plate structures. The first annular positioning plate and each elastic supporting gasket 2 are integrally formed, and the second annular positioning plate and each foil gasket 4 are integrally formed. Further, the bearing base plate 1 and the fixing plate 3 are annular plates.
Specifically, the bearing bottom plate 1, the annular structure spliced by the elastic support gaskets 2 and the first annular positioning plate, the fixing plate 3, the annular structure spliced by the foil gaskets 4 and the second annular positioning plate and the annular structure spliced by the top foil 5 are coaxially arranged, and a through central through hole is formed in the middle of the bearing bottom plate.
Specifically, the width of the foil washer 4 is smaller than that of the support interval, and the outer circumference diameter of the ring structure spliced by the top foil 5 is smaller than that of the bearing bottom plate 1. The thickness of each part is different, the size and the shape of the fan-shaped structure in each gasket are different, the number of layers of the elastic supporting structures is different, and the number of the top foil sheets 5 can be 4, 6, 8, 10 or other numbers, and the protection scope of the invention is also included.
On the basis that each above-mentioned embodiment provided the aerodynamic thrust bearing, the peripheral diameter of bearing bottom plate 1, first annular locating plate, fixed plate 3 and second annular locating plate is the same, and each plate periphery edge all is provided with a plurality of location mouths, and a plurality of location mouths on the same plate evenly arrange, and the location mouth quantity of each plate is the same and relative simultaneously, forms the complete opening that runs through for insert the setting element, carry out the fixed positioning of circumferencial direction and thickness direction to the bearing. Specifically, the positioning opening is an open pin hole with an outward opening, and the positioning piece is a pin or a bolt, but of course, each component can also be welded.
The dynamic pressure gas thrust bearing provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The dynamic pressure gas thrust bearing is characterized by comprising a bearing bottom plate (1), elastic supporting gaskets (2), a fixing plate (3), foil gaskets (4) and a top layer foil (5), wherein the elastic supporting gaskets (2) are sequentially laid on the front surface of the bearing bottom plate (1) along the circumferential direction, a central through hole of the bearing bottom plate (1) is surrounded and avoided, supporting intervals are arranged between the adjacent elastic supporting gaskets (2), the fixing plate (3) is laid on the front surface of the elastic supporting gasket (2), the foil gaskets (4) are sequentially laid on the front surface of the fixing plate (3) along the circumferential direction, the central through hole of the fixing plate (3) is surrounded and avoided, foil intervals are arranged between the adjacent foil gaskets (4), and each foil gasket (4) is sequentially opposite to the corresponding supporting interval, the top layer foils (5) are sequentially laid on the front surface of the fixing plate (3) in the circumferential direction, surround and avoid the central through hole of the fixing plate (3), the fixed ends of the top layer foils (5) in the same direction penetrate through the corresponding foils to be fixedly connected with the front surface of the fixing plate (3) at intervals, and the free ends of the top layer foils (5) are lapped on the corresponding front surfaces of the foil gaskets (4).
2. The hydrodynamic gas thrust bearing according to claim 1, wherein the top foil (5) is a sector plate provided with an avoidance gap at the center of the circle, and the top foils (5) are spliced into an annular structure.
3. The gas dynamic pressure thrust bearing according to claim 2, wherein the foil washer (4) is a sector plate provided with an avoiding gap at the center of the circle, and the foil interval is a sector gap.
4. The gas dynamic pressure thrust bearing according to claim 3, wherein the elastic support gasket (2) is a sector plate provided with an avoidance gap at the center of the circle, and the support gap is a sector gap.
5. The dynamic pressure gas thrust bearing according to claim 4, wherein each of the elastic support spacers (2) is peripherally attached to an inner side of a first annular retainer plate, and each of the foil spacers (4) is peripherally attached to an inner side of a second annular retainer plate.
6. Hydrodynamic gas thrust bearing according to claim 5, characterized in that the bearing bottom plate (1) and the fixing plate (3) are annular plates.
7. The gas dynamic thrust bearing according to claim 6, wherein the bearing bottom plate (1), the splicing structure of the elastic supporting gaskets (2), the fixing plate (3), the splicing structure of the foil gaskets (4) and the splicing structure of the top foil (5) are coaxially arranged, and a through hole is formed in the middle of the bearing bottom plate.
8. Hydrodynamic gas thrust bearing according to claim 7, characterized in that the width of the foil washer (4) is smaller than the width of the supporting gap, and the outer circumferential diameter of the ring structure to which the top foil (5) is joined is smaller than the diameter of the bearing bottom plate (1).
9. The dynamic pressure gas thrust bearing according to any one of claims 6 to 8, wherein the outer circumferential diameters of the bearing bottom plate (1), the first annular positioning plate, the fixing plate (3) and the second annular positioning plate are the same, and a plurality of positioning ports are uniformly arranged at the outer circumferential edge of each plate member, the positioning ports of each plate member being opposed and into which a positioning member is inserted.
10. The dynamic pressure gas thrust bearing of claim 9, wherein said positioning opening is an open pin hole opened outward, and said positioning member is a pin or a bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111573058.1A CN114233746A (en) | 2021-12-21 | 2021-12-21 | Dynamic pressure gas thrust bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111573058.1A CN114233746A (en) | 2021-12-21 | 2021-12-21 | Dynamic pressure gas thrust bearing |
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| Publication Number | Publication Date |
|---|---|
| CN114233746A true CN114233746A (en) | 2022-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111573058.1A Pending CN114233746A (en) | 2021-12-21 | 2021-12-21 | Dynamic pressure gas thrust bearing |
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| CN (1) | CN114233746A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016080119A (en) * | 2014-10-21 | 2016-05-16 | 株式会社Ihi | Thrust bearing |
| KR20200109088A (en) * | 2019-03-12 | 2020-09-22 | 한화파워시스템 주식회사 | Foil thrust bearing |
| CN111963571A (en) * | 2020-08-14 | 2020-11-20 | 北京稳力科技有限公司 | Foil dynamic pressure gas bearing |
| CN112253617A (en) * | 2020-11-10 | 2021-01-22 | 上海优社动力科技有限公司 | Thrust gas foil bearing and bearing assembly |
| CN112727914A (en) * | 2021-01-14 | 2021-04-30 | 上海优社动力科技有限公司 | Net-shaped thrust gas foil bearing |
| CN113669363A (en) * | 2021-08-26 | 2021-11-19 | 北京动力机械研究所 | Thrust dynamic pressure gas bearing of fillet elastic foil piece supporting structure |
-
2021
- 2021-12-21 CN CN202111573058.1A patent/CN114233746A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016080119A (en) * | 2014-10-21 | 2016-05-16 | 株式会社Ihi | Thrust bearing |
| KR20200109088A (en) * | 2019-03-12 | 2020-09-22 | 한화파워시스템 주식회사 | Foil thrust bearing |
| CN111963571A (en) * | 2020-08-14 | 2020-11-20 | 北京稳力科技有限公司 | Foil dynamic pressure gas bearing |
| CN112253617A (en) * | 2020-11-10 | 2021-01-22 | 上海优社动力科技有限公司 | Thrust gas foil bearing and bearing assembly |
| CN112727914A (en) * | 2021-01-14 | 2021-04-30 | 上海优社动力科技有限公司 | Net-shaped thrust gas foil bearing |
| CN113669363A (en) * | 2021-08-26 | 2021-11-19 | 北京动力机械研究所 | Thrust dynamic pressure gas bearing of fillet elastic foil piece supporting structure |
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