CN112128226A - Foil radial gas dynamic pressure bearing and motor - Google Patents
Foil radial gas dynamic pressure bearing and motor Download PDFInfo
- Publication number
- CN112128226A CN112128226A CN202011076859.2A CN202011076859A CN112128226A CN 112128226 A CN112128226 A CN 112128226A CN 202011076859 A CN202011076859 A CN 202011076859A CN 112128226 A CN112128226 A CN 112128226A
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- Prior art keywords
- foil
- bearing
- dynamic pressure
- radial
- gas dynamic
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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
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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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
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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
- 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
Abstract
The invention discloses a radial foil gas dynamic pressure bearing, which comprises a shaft sleeve and a bearing foil set arranged on the inner wall of the shaft sleeve, wherein the bearing foil set comprises a top foil, a limiting foil and a wave foil which are sequentially stacked; a top foil for contacting a rotor of the electric machine; the bump foil is clamped between the limiting foil and the inner wall of the shaft sleeve; through holes are arranged on the limiting foil sheet at positions corresponding to the wavy elastic parts of the wave foil sheet; the wave-shaped elastic part is accommodated in the through hole and is contacted with the top foil. In the foil radial gas dynamic pressure bearing, the limiting foil is provided with the through hole, the wavy elastic part of the wavy foil is accommodated in the through hole, the through hole limits the offset of the wavy elastic part along the axial direction and the circumferential direction, the area of the overlapped part of the wavy elastic part in the wavy foil and the supporting area in the top foil is increased when axial and radial disturbance occurs after the motor rotor operates, and the foil radial gas dynamic pressure bearing is ensured to have higher bearing capacity. The invention also provides a motor, and the radial gas dynamic pressure bearing of the foil is applied.
Description
Technical Field
The invention relates to the technical field of high-speed rotating mechanical equipment, in particular to a foil radial gas dynamic pressure bearing and a motor.
Background
The foil radial gas dynamic bearing is a self-acting gas dynamic bearing which takes a flexible surface as a support, generally takes surrounding ambient gas as a lubricant, and belongs to one branch of gas dynamic lubrication technology.
The radial foil aerodynamic bearing comprises a bearing sleeve and a plurality of foils arranged on the inner wall of the bearing sleeve, wherein one end of each corrugated foil is limited on the inner wall of the bearing sleeve along the axial direction and the circumferential direction, and the other end of each corrugated foil is a free end. In practical application, if certain axial and radial disturbance occurs in the operation process of the motor rotor, the wavy elastic region of the wavy foil can be axially and circumferentially deviated, the overlapping part area of the wavy elastic region of the wavy foil and the supporting region in the top foil is reduced, and the bearing capacity of the bearing is reduced. As shown in fig. 1, when the bump foil 02 is offset by Δ x in the axial direction and Δ y in the circumferential direction with respect to the top foil 01, the area of the overlapping region is reduced to (x- Δ x) (y- Δ y), and the bearing load capacity of the bearing also becomes the original one
Therefore, the problem to be solved by those skilled in the art is how to reduce the offset of the wavy elastic region of the corrugated foil in the foil radial aerodynamic bearing and improve the bearing capacity of the foil radial aerodynamic bearing.
Disclosure of Invention
In view of the above, the present invention provides a foil radial aerodynamic bearing, wherein a through hole is formed in a limiting foil, a wavy elastic portion of a corrugated foil is accommodated in the through hole, and the through hole limits an offset of the wavy elastic portion along an axial direction and a circumferential direction, so as to increase an overlapping area of the wavy elastic portion of the corrugated foil and a supporting area in a top foil when axial and radial disturbances occur during operation of a motor rotor, and ensure that the foil radial aerodynamic bearing has a high load-bearing capacity. The invention also provides a motor applying the foil radial gas dynamic pressure bearing.
In order to achieve the purpose, the invention provides the following technical scheme:
a radial foil gas dynamic pressure bearing comprises a shaft sleeve and a bearing foil set arranged on the inner wall of the shaft sleeve, wherein the bearing foil set comprises a top foil, a limiting foil and a wave foil which are sequentially stacked; wherein the top foil is for contacting a rotor of an electric machine; the bump foil is clamped between the limiting foil and the inner wall of the shaft sleeve; through holes are formed in the position, corresponding to the wavy elastic part of the corrugated foil piece, of the limiting foil piece; the wavy portion is accommodated in the through hole and is in contact with the top foil.
Preferably, in the foil radial aerodynamic bearing, a first end and a second end of the top foil are respectively mounted on an inner wall of the shaft sleeve; the first end and the second end of the limiting foil are respectively arranged on the inner wall of the shaft sleeve; the first end of the bump foil is arranged on the inner wall of the shaft sleeve, and the second end of the bump foil is a free end.
Preferably, in the above foil radial aerodynamic bearing, an insertion groove is formed in an inner wall of the shaft sleeve, first ends of the top foil, the limiting foil and the bump foil are all inserted into one insertion groove, and second ends of the top foil and the limiting foil are all inserted into another insertion groove.
Preferably, in the foil radial aerodynamic bearing, the insertion groove is L-shaped and includes a radial portion and an axial portion that communicate with each other, and an end of each foil is inserted from the radial portion into the insertion groove and inserted into the circumferential portion.
Preferably, in the foil radial aerodynamic bearing, a first end and a second end of the top foil are respectively mounted on an inner wall of the shaft sleeve; the first end and the second end of the limiting foil are respectively arranged on the inner wall of the shaft sleeve; the first end and the second end of the bump foil are respectively arranged on the inner wall of the shaft sleeve.
Preferably, in the above foil radial aerodynamic bearing, the inner wall of the shaft sleeve is provided with a first slot and a second slot which are matched with the bearing foil set, the first slot is L-shaped and includes a radial portion and an axial portion which are communicated with each other, and the first ends of the top foil, the limit foil and the wave foil are inserted into the first slot from the radial portion and are inserted into the circumferential portion; the second slot is arranged from the opening to the bottom of the slot along the extending direction of the bearing foil group, and the second ends of the top foil, the limiting foil and the bump foil are inserted into the second slot from the opening of the second slot.
Preferably, in the above-described foil radial aerodynamic bearing, the number of the carrier foil groups is 3 to 12, and the carrier foil groups are uniformly distributed along the circumferential direction of the bearing housing.
Preferably, in the foil radial aerodynamic bearing, a surface of the top foil, which is used for contacting the rotor, is provided with a solid self-lubricating coating.
Preferably, in the foil radial aerodynamic bearing, a pin hole is provided in an end surface of the sleeve.
A motor comprises a rotor and a bearing arranged on the rotor, wherein the bearing is the foil radial aerodynamic bearing in any one of the technical schemes.
The invention provides a radial foil gas dynamic pressure bearing, which comprises a shaft sleeve and a bearing foil set arranged on the inner wall of the shaft sleeve, wherein the bearing foil set comprises a top foil, a limiting foil and a wave foil which are sequentially stacked; wherein the top foil is for contacting a rotor of the electrical machine; the bump foil is clamped between the limiting foil and the inner wall of the shaft sleeve; through holes are arranged on the limiting foil sheet at positions corresponding to the wavy elastic parts of the wave foil sheet; the wave-shaped elastic part is accommodated in the through hole and is contacted with the top foil.
In the foil radial aerodynamic bearing provided by the invention, the limiting foil is provided with the through hole, the wavy elastic part of the wavy foil is accommodated in the through hole, and the through hole limits the offset of the wavy elastic part along the axial direction and the circumferential direction, so that the area of the overlapped part of the wavy elastic part in the wavy foil and the supporting area in the top foil when axial and radial disturbance occurs after the motor rotor operates is increased, and the foil radial aerodynamic bearing is ensured to have higher bearing capacity.
The invention also provides a motor, which applies the foil radial gas dynamic pressure bearing, and the bearing has strong bearing capacity and improves the running reliability of the motor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art foil radial gas dynamic bearing with the bump foil offset relative to the top foil;
fig. 2 is a schematic structural view of a foil radial aerodynamic bearing according to embodiment 1 of the present invention;
fig. 3 is an exploded view of a foil radial gas dynamic bearing provided in embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of a bump foil provided in embodiment 1 of the present invention;
FIG. 5 is an assembly view of a bump foil and a bump foil according to embodiment 1 of the present invention;
FIG. 6 is a schematic structural view of a foil radial gas dynamic bearing according to embodiment 2 of the present invention;
fig. 7 is an exploded view of a foil radial gas dynamic bearing provided in embodiment 2 of the present invention;
fig. 8 is a schematic structural diagram of a bump foil provided in embodiment 2 of the present invention;
fig. 9 is an assembly view of a bump foil and a stopper foil provided in embodiment 2 of the present invention.
Wherein, in fig. 2-9:
a shaft sleeve 101; a pin hole 111; a bump foil sheet 102; a wave-shaped elastic part 121; a stopper foil 103; a top foil 104.
Detailed Description
The embodiment of the invention discloses a foil radial gas dynamic pressure bearing, wherein a limiting foil is provided with a through hole, a wave-shaped elastic part of a wave foil is accommodated in the through hole, the through hole limits the offset of the wave-shaped elastic part along the axial direction and the circumferential direction, the overlapping part area of the wave-shaped elastic part of the wave foil and a supporting area in a top foil is increased when axial and radial disturbance occurs in the operation of a motor rotor, and the foil radial gas dynamic pressure bearing is ensured to have higher bearing capacity. The embodiment of the invention also discloses a motor applying the foil radial gas dynamic pressure bearing.
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. 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.
Referring to fig. 2 to 9, an embodiment of the invention provides a foil radial aerodynamic bearing, including a shaft sleeve 101 and a bearing foil set installed on an inner wall of the shaft sleeve 101, where the bearing foil set includes a top foil 104, a limiting foil 103, and a bump foil 102, which are sequentially stacked; wherein the top foil 104 is for contacting a rotor of the electrical machine; the bump foil 102 is clamped between the limiting foil 103 and the inner wall of the shaft sleeve 101; through holes are arranged on the position of the limiting foil 103 corresponding to the wavy elastic part 121 of the corrugated foil 102; the wavy elastic portion 121 is received in the through hole and contacts the top foil 104.
In the foil radial aerodynamic bearing provided by the embodiment of the invention, the limiting foil 103 is provided with the through hole, the wavy elastic part 121 of the wavy foil 102 is accommodated in the through hole, and the through hole limits the offset of the wavy elastic part 121 along the axial direction and the circumferential direction, so that the overlapping part area of the wavy elastic part 121 in the wavy foil 102 and the supporting area in the top foil 104 when axial and radial disturbance occurs after the motor rotor operates is increased, and the foil radial aerodynamic bearing is ensured to have higher bearing capacity.
Specifically, in the foil radial aerodynamic bearing, the size of the through hole is slightly larger than that of the wavy elastic portion 121, so as to limit the axial displacement and the circumferential displacement of the wavy elastic portion 121 in the through hole within a certain range.
The following describes the mounting structure of the load-bearing foil set on the inner wall of the shaft sleeve 101 in a specific embodiment:
example 1
Referring to fig. 2 to 5, in the foil radial aerodynamic bearing according to the embodiment of the present invention, a first end and a second end of a top foil 104 are respectively installed on an inner wall of a shaft housing 101; the first end and the second end of the limiting foil 103 are respectively arranged on the inner wall of the shaft sleeve 101; the bump sheet 102 is mounted on the inner wall of the sleeve 101 at a first end and is free at a second end. The first and second ends are both ends of each foil along the circumferential direction of the sleeve 101.
Specifically, in the foil radial aerodynamic bearing, the inner wall of the shaft sleeve 101 is provided with an insertion slot, the first ends of the top foil 104, the limiting foil 103 and the bump foil 102 are all inserted into one insertion slot, and the second ends of the top foil 104 and the limiting foil 103 are all inserted into another insertion slot.
The slots are L-shaped and comprise a radial part and an axial part which are communicated with each other, and the end part of each foil is inserted into the corresponding slot from the radial part and is inserted into the circumferential part of the slot.
Example 2
Referring to fig. 6 to 9, in the foil radial aerodynamic bearing according to the embodiment of the present invention, a first end and a second end of a top foil 104 are respectively installed on an inner wall of a shaft housing 101; the first end and the second end of the limiting foil 103 are respectively arranged on the inner wall of the shaft sleeve 101; the bump sheet 102 has first and second ends respectively mounted to the inner wall of the sleeve 101. The first and second ends are both ends of each foil along the circumferential direction of the sleeve 101.
Specifically, in the foil radial gas dynamic pressure bearing, the inner wall of the shaft sleeve 101 is provided with a first slot and a second slot which are assembled and assembled with the bearing foil; the first slot is L-shaped and comprises a radial part and an axial part which are communicated with each other, and the first ends of the top foil piece 104, the limiting foil piece 103 and the bump foil piece 102 are inserted into the first slot from the radial part and are inserted into the circumferential part; the second slot is arranged from the opening to the bottom of the slot along the extension direction of the bearing foil group, and the second ends of the top foil 104, the stopper foil 103 and the bump foil 102 are inserted into the second slot from the opening of the second slot.
In the two embodiments, the slot width of each slot is left with allowance for providing a moving space for the end part movement of each foil inserted and matched with the slot due to the action of pneumatic force.
In the foil radial aerodynamic bearing provided by the embodiment of the invention, the bearing foil groups are 3-12 groups, and all the bearing foil groups are uniformly distributed along the circumferential direction of the bearing sleeve 101; correspondingly, the number of the slots on the inner wall of the shaft sleeve 101 is twice that of the bearing foil sets, two ends of each bearing foil set are respectively in plug-in fit with one slot, and each slot is only in plug-in fit with the end of one bearing foil set.
When the foil radial gas dynamic pressure bearing is applied, a certain cavity is formed between the rotor and the adjacent bearing foil group between the rotor and the foil radial gas dynamic pressure bearing provided by the embodiment of the invention, so that the pneumatic bearing capacity of the foil radial gas dynamic pressure bearing can be improved.
Specifically, in the foil radial gas dynamic pressure bearing, the surface of the top foil 104 for contacting the rotor is provided with a solid self-lubricating coating. The end face of the sleeve 101 is provided with a pin hole 111 for mounting a pin which can position the sleeve 101 in the circumferential direction of the bearing housing.
The foil radial aerodynamic bearing provided by the embodiment of the invention has the advantages of compact structure and stable operation.
The embodiment of the invention also provides a motor, which comprises a rotor and a bearing arranged on the rotor, wherein the bearing is the foil radial aerodynamic bearing provided by the embodiment.
The motor provided by the embodiment of the invention adopts the foil radial aerodynamic bearing provided by the embodiment, the bearing has strong bearing capacity, and the running reliability of the motor can be improved. Of course, the motor provided in this embodiment has other effects related to the foil radial aerodynamic bearing provided in the above embodiments, and will not be described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A foil radial gas dynamic pressure bearing is characterized by comprising a shaft sleeve and a bearing foil set arranged on the inner wall of the shaft sleeve, wherein the bearing foil set comprises a top foil, a limiting foil and a bump foil which are sequentially stacked; wherein the top foil is for contacting a rotor of an electric machine; the bump foil is clamped between the limiting foil and the inner wall of the shaft sleeve; through holes are formed in the position, corresponding to the wavy elastic part of the corrugated foil piece, of the limiting foil piece; the wavy portion is accommodated in the through hole and is in contact with the top foil.
2. The foil radial gas dynamic pressure bearing of claim 1, wherein the first and second ends of the top foil are respectively mounted to the inner wall of the sleeve; the first end and the second end of the limiting foil are respectively arranged on the inner wall of the shaft sleeve; the first end of the bump foil is arranged on the inner wall of the shaft sleeve, and the second end of the bump foil is a free end.
3. The foil radial gas dynamic pressure bearing of claim 2, wherein the sleeve has slots in an inner wall thereof, the top foil, the retainer foil and the bump foil each having a first end inserted into one slot and a second end inserted into the other slot.
4. Foil radial gas dynamic pressure bearing according to claim 2 or 3, wherein the insertion groove is L-shaped and comprises a radial portion and an axial portion communicating with each other, the end of each foil being inserted from the radial portion into the insertion groove and from the circumferential portion.
5. The foil radial gas dynamic pressure bearing of claim 1, wherein the first and second ends of the top foil are respectively mounted to the inner wall of the sleeve; the first end and the second end of the limiting foil are respectively arranged on the inner wall of the shaft sleeve; the first end and the second end of the bump foil are respectively arranged on the inner wall of the shaft sleeve.
6. Foil radial gas dynamic pressure bearing according to claim 5, wherein the inner wall of the sleeve is provided with a first slot and a second slot cooperating with the carrier foil set, the first slot being L-shaped and comprising a radial portion and an axial portion communicating with each other, the first ends of the top foil, the stopper foil and the bump foil being inserted from the radial portion into the first slot and into the circumferential portion; the second slot is arranged from the opening to the bottom of the slot along the extending direction of the bearing foil group, and the second ends of the top foil, the limiting foil and the bump foil are inserted into the second slot from the opening of the second slot.
7. Foil radial gas dynamic pressure bearing according to claim 1, characterized in that the groups of carrier foil are 3-12 and that each of the groups of carrier foil is evenly distributed in the circumferential direction of the bearing sleeve.
8. Foil radial gas dynamic pressure bearing according to claim 1, characterized in that the surface of the top foil intended to contact the rotor is provided with a solid self-lubricating coating.
9. Foil radial gas dynamic pressure bearing according to claim 1, characterized in that the end face of the sleeve is provided with a pin hole.
10. An electrical machine comprising a rotor and a bearing provided on the rotor, wherein the bearing is a foil radial gas dynamic pressure bearing as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011076859.2A CN112128226B (en) | 2020-10-10 | 2020-10-10 | Foil radial gas dynamic pressure bearing and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011076859.2A CN112128226B (en) | 2020-10-10 | 2020-10-10 | Foil radial gas dynamic pressure bearing and motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112128226A true CN112128226A (en) | 2020-12-25 |
| CN112128226B CN112128226B (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011076859.2A Active CN112128226B (en) | 2020-10-10 | 2020-10-10 | Foil radial gas dynamic pressure bearing and motor |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4701060A (en) * | 1986-07-24 | 1987-10-20 | The Garrett Corporation | Foil journal bearing cooling |
| US5634723A (en) * | 1995-06-15 | 1997-06-03 | R & D Dynamics Corporation | Hydrodynamic fluid film bearing |
| US20060018574A1 (en) * | 2004-07-20 | 2006-01-26 | Honeywell International Inc., | Hydrodynamic journal bearing |
| JP2009299748A (en) * | 2008-06-12 | 2009-12-24 | Ihi Corp | Foil bearing |
| CN108425940A (en) * | 2018-03-06 | 2018-08-21 | 西安交通大学 | A kind of big carrying elastic foil gas bearing with automatic adjusument |
| KR101968658B1 (en) * | 2018-11-23 | 2019-04-12 | (주) 터보맥스 | Bi-directional foil bearing |
| CN209687919U (en) * | 2019-03-27 | 2019-11-26 | 博世汽车柴油系统有限公司 | Foil air bearing |
| CN110594286A (en) * | 2019-08-30 | 2019-12-20 | 广州市昊志机电股份有限公司 | Foil gas dynamic pressure bearing and high-speed motor |
-
2020
- 2020-10-10 CN CN202011076859.2A patent/CN112128226B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4701060A (en) * | 1986-07-24 | 1987-10-20 | The Garrett Corporation | Foil journal bearing cooling |
| US5634723A (en) * | 1995-06-15 | 1997-06-03 | R & D Dynamics Corporation | Hydrodynamic fluid film bearing |
| US20060018574A1 (en) * | 2004-07-20 | 2006-01-26 | Honeywell International Inc., | Hydrodynamic journal bearing |
| JP2009299748A (en) * | 2008-06-12 | 2009-12-24 | Ihi Corp | Foil bearing |
| CN108425940A (en) * | 2018-03-06 | 2018-08-21 | 西安交通大学 | A kind of big carrying elastic foil gas bearing with automatic adjusument |
| KR101968658B1 (en) * | 2018-11-23 | 2019-04-12 | (주) 터보맥스 | Bi-directional foil bearing |
| CN209687919U (en) * | 2019-03-27 | 2019-11-26 | 博世汽车柴油系统有限公司 | Foil air bearing |
| CN110594286A (en) * | 2019-08-30 | 2019-12-20 | 广州市昊志机电股份有限公司 | Foil gas dynamic pressure bearing and high-speed motor |
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| Publication number | Publication date |
|---|---|
| CN112128226B (en) | 2022-04-12 |
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