CN114087278B - Cantilever foil and dynamic pressure air-float radial bearing - Google Patents
Cantilever foil and dynamic pressure air-float radial bearing Download PDFInfo
- Publication number
- CN114087278B CN114087278B CN202111537804.1A CN202111537804A CN114087278B CN 114087278 B CN114087278 B CN 114087278B CN 202111537804 A CN202111537804 A CN 202111537804A CN 114087278 B CN114087278 B CN 114087278B
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- Prior art keywords
- end ring
- bearing
- foil
- foils
- dynamic pressure
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- 239000011888 foil Substances 0.000 title claims abstract description 116
- 238000005452 bending Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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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
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/024—Sliding-contact bearings for exclusively rotary movement for radial load only with flexible leaves to create hydrodynamic wedge, e.g. radial foil bearings
-
- 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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/14—Special methods of manufacture; Running-in
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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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
-
- 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
- F16C2220/00—Shaping
- F16C2220/40—Shaping by deformation without removing material
-
- 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
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/50—Positive connections
- F16C2226/62—Positive connections with pins, bolts or dowels
-
- 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
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/20—Application independent of particular apparatuses related to type of movement
- F16C2300/22—High-speed rotation
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Support Of The Bearing (AREA)
Abstract
The invention provides an integrated cantilever foil and a dynamic pressure air bearing, wherein the integrated cantilever foil comprises a first end ring and a second end ring which are oppositely arranged in parallel at intervals and are concentric, the diameters of the first end ring and the second end ring are equal, a plurality of elastic foils are uniformly arranged between the first end ring and the second end ring at intervals along the circumferential direction of the first end ring, and the fixed ends of the elastic foils are connected between the first end ring and the second end ring through bending parts. According to the invention, the plurality of elastic foils are connected into a whole through the first end ring and the second end ring, so that the processing consistency of the radial bearing foils is effectively ensured, the integrated cantilever foils can be assembled and positioned in the longitudinal grooves of the bearing seat through the bending parts, the fixed installation is more convenient, meanwhile, the bearing capacity of the radial bearing is improved, the stability of the bearing is improved, and the radial bearing has higher practicability.
Description
Technical Field
The invention belongs to the technical field of foil bearing design, and particularly relates to an integrated cantilever foil and dynamic pressure air bearing radial bearing.
Background
The cantilever foil gas bearing has the great advantages of ultralow friction coefficient, simple structure, no pollution, long service life and good bearing performance, is widely applied to the high-speed rotation field, and becomes a research focus in the military and aviation fields. The cantilever dynamic pressure bearing structure comprises a bearing seat and a bearing bush, wherein the bearing bush is formed by uniformly overlapping a plurality of foils along the inner wall of the bearing seat, one end of each foil is fixed, welded or hinged in a groove of the bearing seat, and the other end of each foil is mutually overlapped with the adjacent foil.
In the high-speed running process of the rotor, air is continuously brought into a wedge-shaped space between the foil and the journal to form a dynamic high-pressure air film, the rotor is borne by the air film, the rotor and the bearing are in non-contact high-speed running, the friction coefficient in the running process is greatly reduced, the loss caused by friction is further reduced, and the running speed of the rotor is improved.
The existing dynamic pressure air bearing has the following problems:
(1) The consistency of bearing installation cannot be considered:
The radial dynamic pressure bearing is provided with 6-8 elastic foils along the circumferential direction, the foils are difficult to strictly control in a series of forming processes of cutting, stamping and shaping, bending and heat treatment and shaping, the overall consistency of the radial bearing foils is difficult to ensure, the requirements of a designer cannot be met, and the conditions of low bearing performance and unstable operation of the radial bearing can occur. In addition, one end of the foil is fixed in the groove of the bearing seat, the fixed mounting mode has great influence on the performance of the radial bearing, the cylindrical pin or welding is generally adopted for fixing at present, the coaxiality precision requirement of the inner hole of the bearing is very high, when the deviation is more, the foil and the journal can not be separated, the air film pressure bearing and lubrication can not be generated for dry friction, the elastic foil of the traditional radial bearing is complex in fixed mode, the assembly process is difficult, and the assembly precision can not be ensured.
(2) Bearing load bearing is poor:
a plurality of elastic foils of the radial dynamic pressure bearing are provided with a fixed end and a free end, each fixed end is longitudinally and independently fixed through an inner hole of the bearing seat, and after self-excited vibration occurs after external impact load is received, only radial vibration reduction can be independently performed in the bearing seat, so that the integral rigidity of the bearing is insufficient, and finally, an air film is invalid and even the bearing is damaged. The radial bearing has poor bearing performance under the actual motor operation condition.
In summary, the cantilever foil pneumatic air bearing radial bearing in the prior art has the problems of poor bearing preparation consistency, poor bearing performance and the like.
Disclosure of Invention
Therefore, the invention provides an integrated cantilever foil and dynamic pressure air bearing radial bearing, which can overcome the defects of difficult fixed installation, poor bearing processing consistency and poor bearing performance of the cantilever foil dynamic pressure air bearing radial bearing in the prior art.
In order to solve the above problems, the present invention provides an integrated cantilever foil, which comprises a first end ring and a second end ring which are relatively parallel and spaced and concentrically, wherein the diameters of the first end ring and the second end ring are equal, a plurality of elastic foils are uniformly spaced along the circumferential direction of the first end ring between the first end ring and the second end ring, and the fixed ends of the elastic foils are connected between the first end ring and the second end ring through bending parts.
In some embodiments, the first end ring, the second end ring, the bent portion, and the plurality of elastic foils are formed by processing a circular ring-shaped foil column.
The invention also provides a dynamic pressure air-bearing radial bearing, which comprises a bearing seat and a bearing bush positioned in the bearing seat, wherein the bearing bush consists of at least two integrated cantilever foils.
In some embodiments, at least two of the unitary cantilever foils comprise a first foil having a first end ring with a diameter greater than a diameter of a first end ring the second foil has.
In some embodiments, the first foil has a first radial height of the folds that is greater than a second radial height of the folds that the second foil has, and the bearing housing has a first longitudinal groove corresponding to the folds of the first foil, a second longitudinal groove corresponding to the folds of the second foil, the first longitudinal groove having a groove depth equal to the first radial height, and the second longitudinal groove having a groove depth equal to the second radial height.
In some embodiments, axial ends of the bearing housing are respectively configured with shaft end ring grooves capable of mounting the first end ring and the second end ring.
In some embodiments, the bearing housing is formed from at least two split assemblies.
In some embodiments, two adjacent segments are pinned together.
According to the integrated cantilever foil and dynamic pressure air-bearing radial bearing, the plurality of elastic foils are connected into a whole through the first end ring and the second end ring, so that the processing consistency of the radial bearing foils is effectively ensured, the integrated cantilever foil can be assembled and positioned in the longitudinal groove of the bearing seat through the bending part, the fixed installation is more convenient, meanwhile, the bearing capacity of the radial bearing is improved, the stability of the bearing is improved, and the integrated cantilever foil has higher practicability.
Drawings
FIG. 1 is a schematic perspective view of an integrated cantilever foil according to an embodiment of the present invention;
FIG. 2 is an axial projection of FIG. 1;
FIG. 3 is a radial cross-sectional view of a dynamic pressure air bearing in accordance with another embodiment of the present invention;
FIG. 4 is a schematic perspective view of the split body of FIG. 3;
FIG. 5 is a schematic view showing the assembly of the bent portion of the first foil in FIG. 3 with the first longitudinal groove;
fig. 6 is a schematic diagram illustrating the assembly of the bent portion of the second foil in fig. 3 with the second longitudinal groove.
The reference numerals are expressed as:
11. A first end ring; 12. a second end ring; 2. an elastic foil; 3. a bending part; 10. a bearing seat; 101. a first longitudinal groove; 102. a second longitudinal groove; 103. a shaft end ring groove; 104. splitting; 1041. a pin body; 1042. a pin hole; 21. a first foil; 22. and a second foil.
Detailed Description
Referring to fig. 1 to 6 in combination, according to an embodiment of the present invention, there is provided an integrated cantilever foil, including a first end ring 11 and a second end ring 12 disposed concentrically and relatively parallel to each other, wherein the diameters of the first end ring 11 and the second end ring 12 are equal, and a plurality of elastic foils 2 are disposed between the first end ring 11 and the second end ring 12 at uniform intervals along the circumferential direction of the first end ring 11, and fixed ends of the elastic foils 2 are connected between the first end ring 11 and the second end ring 12 through bending portions 3. In this technical scheme, a plurality of elastic foils 2 pass through first end ring 11 and second end ring 12 connect as a whole, effectively guarantee radial bearing foil's processing uniformity, through bending portion 3 then can with the equipment of integral type cantilever foil is located in the longitudinal groove that bearing frame 10 had, and fixed mounting is more convenient, simultaneously, has improved radial bearing's bearing capacity, improves bearing's stability, has stronger practicality.
In some embodiments, the first end ring 11, the second end ring 12, the bending portion 3 and the plurality of elastic foils 2 are formed by processing a circular ring-shaped foil column, specifically, the integrated cantilever foil of the present invention is integrally formed by a series of cutting, stamping and shaping, bending, heat treatment and shaping, so that the integral consistency of the radial bearing foil can be further effectively ensured, the number of the elastic foils 2 can be set to 3-6, firstly, rectangular elastic foils 2 are cut and reserved on the circular ring-shaped foil column, and then bending processing is performed according to design requirements, so as to form a cantilever foil structure, and realize that the cantilever elastic foil is an integral structure, the bearing area has no dead zone, and vibration of the rotor system is inhibited. It should be noted that, the bearing area of the integrated cantilever foil bearing of the present invention is 360 °, any angle can be used as the bearing area, that is, the cantilever elastic foil of the present invention has no bearing dead zone, while the conventional radial bearing is fixed by the fixing pin, the fixing pin area cannot be used as the bearing area, because the foil of the present invention has no bearing dead zone, and the cantilever foil bearing is designed as an integrated bearing, the overall rigidity of the bearing can be improved, and the vibration of the rotor system can be suppressed after the overall rigidity is improved.
According to an embodiment of the present invention, there is further provided a dynamic pressure air bearing, including a bearing housing 10 and a bearing shell in the bearing housing 10, where the bearing shell is composed of at least two integrated cantilever foils as described above, and it is understood that the bearing housing 10 is used for mounting and supporting to protect the bearing shell. At least two of the above-mentioned integrated cantilever foils are dislocated in the circumferential direction of the bearing housing 10, so that it can be ensured that one free end of two adjacent elastic foils 2 can overlap the inner wall of the other elastic foil 2.
As a specific embodiment, at least two of the integrated cantilever foils include a first foil 21 and a second foil 22, wherein the first foil 21 has a first end ring 11 with a larger diameter than the second foil 22 has a first end ring 11, so that the second foil 22 can be further assembled with the second foil 22 after the first foil 21 is assembled with the bearing housing 10.
As shown in fig. 5 and 6, the first foil 21 has a bent portion 3 with a first radial height greater than a second radial height of the bent portion 3 of the second foil 22, and the bearing seat 10 has a first longitudinal groove 101 corresponding to the bent portion 3 of the first foil 21 and a second longitudinal groove 102 corresponding to the bent portion 3 of the second foil 22, where the groove depth of the first longitudinal groove 101 is equal to the first radial height, and the groove depth of the second longitudinal groove 102 is equal to the second radial height, so as to ensure that the arched root of the elastic foil 2 of the first foil 21 and the arched root of the elastic foil 2 of the second foil 22 are on the same circle, and further ensure that the free ends of the elastic foils 2 can overlap. The first foil 21 and the second foil 22 respectively realize circumferential positioning of the foils through the first longitudinal groove 101 and the second longitudinal groove 102, and meanwhile, the arrangement of the first end ring 11 and the second end ring 12 realizes radial and axial positioning of the foils, so that complex procedures of fixing through cylindrical pins or welding in the prior art are not needed, and the assembly structure and the procedures are simpler.
During specific assembly, the bending parts 3 of the first foil 21 are adjusted to be respectively arranged in the first longitudinal grooves 101, then the bending parts 3 of the second foil 22 are respectively arranged on the radial outer sides of the elastic foils 2 of the first foil 21, and the second foil 22 is arranged in the corresponding second longitudinal grooves 102 after rotating for a certain angle, so that the assembly of the bearing bush and the bearing seat 10 is completed.
In some embodiments, two axial ends of the bearing seat 10 are respectively configured with shaft end ring grooves 103 capable of installing the first end ring 11 and the second end ring 12, and the shaft end ring grooves 103 can limit the radial position of the integrated cantilever foil.
As shown in fig. 3 and 4, the bearing housing 10 is assembled from at least two separate parts 104, i.e., the bearing housing 10 is no longer a unitary structure as in the prior art, but is an assembled structure. The two adjacent split bodies 104 are connected in a pin manner, for example, the matched surfaces of the two split bodies 104 are simultaneously provided with the pin body 1041 and the pin hole 1042, and the two adjacent split bodies 104 are assembled through the pin body 1041 and the pin hole 1042 which are respectively arranged on the two split bodies 104.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (5)
1. The dynamic pressure air bearing comprises a bearing seat (10) and a bearing bush arranged in the bearing seat (10), wherein the bearing bush consists of at least two integrated cantilever foils, the integrated cantilever foils comprise a first end ring (11) and a second end ring (12) which are relatively parallel and spaced concentrically, the diameters of the first end ring (11) and the second end ring (12) are equal, a plurality of elastic foils (2) are uniformly spaced along the circumferential direction of the first end ring (11), the fixed ends of the elastic foils (2) are connected between the first end ring (11) and the second end ring (12) through bending parts (3), and the first end ring (11), the second end ring (12), the bending parts (3) and a plurality of elastic foils (2) are formed by processing circular foil columns; at least two of the integrated cantilever foils comprise a first foil (21), a second foil (22), the first foil (21) having a first end ring (11) with a diameter larger than the diameter of the first end ring (11) the second foil (22) has.
2. Dynamic pressure air bearing according to claim 1, characterized in that the first foil (21) has a bent portion (3) with a first radial height which is greater than a second radial height of the bent portion (3) of the second foil (22), and that the bearing housing (10) has a first longitudinal groove (101) corresponding to the bent portion (3) of the first foil (21), a second longitudinal groove (102) corresponding to the bent portion (3) of the second foil (22), the groove depth of the first longitudinal groove (101) being equal to the first radial height, the groove depth of the second longitudinal groove (102) being equal to the second radial height.
3. Dynamic pressure air bearing according to claim 1, characterized in that the axial ends of the bearing seat (10) are respectively configured with shaft end ring grooves (103) capable of mounting the first end ring (11) and the second end ring (12).
4. A dynamic pressure air bearing radial bearing according to any one of claims 1 to 3, characterized in that the bearing housing (10) is assembled from at least two separate bodies (104).
5. The dynamic pressure air bearing as claimed in claim 4, wherein two adjacent split bodies (104) are pinned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111537804.1A CN114087278B (en) | 2021-12-15 | 2021-12-15 | Cantilever foil and dynamic pressure air-float radial bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111537804.1A CN114087278B (en) | 2021-12-15 | 2021-12-15 | Cantilever foil and dynamic pressure air-float radial bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114087278A CN114087278A (en) | 2022-02-25 |
| CN114087278B true CN114087278B (en) | 2024-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111537804.1A Active CN114087278B (en) | 2021-12-15 | 2021-12-15 | Cantilever foil and dynamic pressure air-float radial bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114087278B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118721058A (en) * | 2023-03-30 | 2024-10-01 | 浙江亚微精密机床有限公司 | An easy-to-process precise positioning matching mechanism |
| CN117072549A (en) * | 2023-09-28 | 2023-11-17 | 杭州长河动力技术有限公司 | A dynamic pressure gas thrust bearing with integrated top foil and bottom foil |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN216554936U (en) * | 2021-12-15 | 2022-05-17 | 珠海格力电器股份有限公司 | Integrated cantilever foil and dynamic pressure air-float radial bearing |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4451163A (en) * | 1982-07-01 | 1984-05-29 | The Garrett Corporation | Foil bearing mounting carrier |
| JP3861018B2 (en) * | 2002-03-14 | 2006-12-20 | 三菱重工業株式会社 | Foil bearing |
| KR101808008B1 (en) * | 2017-09-19 | 2017-12-11 | 정인환 | Air foil bearing |
| CN109854612A (en) * | 2019-02-01 | 2019-06-07 | 西安交通大学 | A kind of resilient support assemblies and kinetic pressure gas transverse bearing |
| CN214788550U (en) * | 2021-04-16 | 2021-11-19 | 河北金士顿科技有限责任公司 | Radial foil dynamic pressure air bearing capable of improving stable operation capability of shafting |
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2021
- 2021-12-15 CN CN202111537804.1A patent/CN114087278B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN216554936U (en) * | 2021-12-15 | 2022-05-17 | 珠海格力电器股份有限公司 | Integrated cantilever foil and dynamic pressure air-float radial bearing |
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| CN114087278A (en) | 2022-02-25 |
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