CN112096733A - Air-floatation radial bearing and foil - Google Patents
Air-floatation radial bearing and foil Download PDFInfo
- Publication number
- CN112096733A CN112096733A CN202011008107.2A CN202011008107A CN112096733A CN 112096733 A CN112096733 A CN 112096733A CN 202011008107 A CN202011008107 A CN 202011008107A CN 112096733 A CN112096733 A CN 112096733A
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- Prior art keywords
- foil
- bearing
- air
- bearing seat
- wave
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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
- 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
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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
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/50—Positive connections
- F16C2226/62—Positive connections with pins, bolts or dowels
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- 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 relates to a foil of an air-floatation radial bearing, which comprises an inner foil, wherein the inner foil comprises a foil arc structure, and two end surfaces of the inner foil are of arc structures. An air-floatation radial bearing comprises the inner foil and a lining foil, wherein the lining foil and the inner foil are combined to form a flat foil; the wave foil is supported on the wave foil, and the wave foil provides an elastic foundation for the wave foil; the flat foil is circumferentially curled along an inner hole of the bearing seat to form a bearing working surface; the wave foil is arranged between the inner hole wall of the bearing seat and the flat foil, an installation groove is further formed in the inner hole wall of the bearing seat, one end of the wave foil is bent towards the centrifugal direction to form an installation part, and the installation part of the wave foil is clamped in the installation groove. The invention effectively improves the abrasion condition of the radial bearing foil by changing the structure of the inner foil without increasing the complexity of the air-floatation radial bearing, and the bearing can keep stable operation effect under a plurality of working conditions.
Description
Technical Field
The invention relates to the technical field of foil type bearings, in particular to an air-floatation radial bearing and the technical field of foils.
Background
The radial dynamic pressure gas bearing adopts a structural form of a flat foil and a wave foil to form a flexible surface, and has the advantages of good high-speed stability, difficult locking, low requirements on manufacturing progress and assembly precision and the like, so that the radial dynamic pressure gas bearing has wide application prospect in high-speed and ultrahigh-speed rotary machinery. The film-like foil bears the axial load of the rotating shaft rotating at high speed by utilizing the hydrodynamic property of air as a lubricating medium. The foils are usually designed as thin plates for improved wear resistance, and coatings are generally used to avoid wear caused by contact between the foil and the rotating shaft rotating at high speeds.
Wear typically occurs in foil journal bearings because the rotating shaft and bearing contact each other in an unstable manner during start-up and shut-down. The relative speed of the inner foil and the journal is low, and the air film is not completely formed or is not stable enough, so that the two surfaces are dry-rubbed, and the surface of the inner foil is seriously abraded. Due to the eccentricity of the bearing, both ends of the foil rub against the journal severely at this time, so that the wear of both ends of the foil is the most severe.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a foil of an air-floatation radial bearing, which effectively improves the abrasion condition of the foil of the radial bearing by changing the structure of an inner foil under the condition of not increasing the complexity of the air-floatation radial bearing, and the bearing can keep a stable operation effect under a plurality of working conditions.
Meanwhile, the invention also provides an air-floatation radial bearing.
In order to overcome the problems in the prior art, the invention provides the following technical scheme:
a foil for an air bearing radial bearing comprising:
an inner foil having a working face facing the axis of rotation and a non-working face remote from the axis of rotation;
the inner foil is provided with a foil arc structure, the foil arc structure is formed on the end face of the inner foil and is transited from the non-working face of the inner foil to the working face of the inner foil through the end face of the inner foil.
In the foil of the air-floating radial bearing disclosed in the present application, optionally, the curvature of the circular arc structure of the foil gradually decreases from the non-working surface of the inner foil to the working surface of the inner foil.
In the foil of the air-floating radial bearing disclosed in the present application, the inner foil working surface is optionally coated with a wear-resistant insulating layer.
Based on the same inventive concept, the application discloses an air-floatation radial bearing for the foil.
The air-float radial bearing comprises the inner foil and
a liner foil, the liner foil and the inner foil being joined to form a flat foil;
the wave foil is supported on the wave foil, and the wave foil provides an elastic foundation for the wave foil;
the flat foil is circumferentially curled along an inner hole of the bearing seat to form a bearing working surface;
the wave foil is arranged between the inner hole wall of the bearing seat and the flat foil, an installation groove is further formed in the inner hole wall of the bearing seat, one end of the wave foil is bent towards the centrifugal direction to form an installation part, and the installation part of the wave foil is clamped in the installation groove.
In the air-floating radial bearing disclosed by the application, optionally, one end of each of the liner foil and the inner foil is fixed on the bearing seat, and the other end of each of the liner foil and the inner foil is curled along the circumferential direction of the inner hole of the bearing seat to form a free end.
In the air-floating radial bearing disclosed in the present application, optionally, a fixing pin is provided on the inner hole wall of the bearing seat, and the fixing pin fixes both the flat foil piece and the wave foil piece on the bearing seat.
In the foil of the air-floating radial bearing disclosed in the present application, optionally, the inner foil is one piece, and the bump foil is a plurality of pieces.
In the air-floating radial bearing disclosed in the present application, optionally, a radial cross section of the bump foil is a sine wave shape.
The invention has the beneficial effects that:
the invention effectively improves the abrasion condition of the radial bearing foil by changing the structure of the inner foil without increasing the complexity of the air-floatation radial bearing, and the bearing can keep stable operation effect under a plurality of working conditions.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
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 view of the overall structure of an inner foil;
FIG. 2 is a schematic cross-sectional view of a prior art inner foil A-A;
FIG. 3 is an enlarged partial cross-sectional view of a prior art inner foil;
FIG. 4 is a schematic cross-sectional view of an inner foil A-A of an airfoil radial bearing;
FIG. 5 is an enlarged, fragmentary cross-sectional view of an inner foil of an airfoil radial bearing;
FIG. 6 is a schematic view of the overall structure of an air-bearing radial bearing;
FIG. 7 is an enlarged view of a portion of an air bearing.
In the drawings
1-a bearing seat; 2-inner foil; 21-foil arc structure; 3-a foil liner; 4-wave foil.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the embodiments of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Moreover, embodiments of the present application may repeat reference numerals or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, 2, 3 and 4, the present invention discloses an embodiment of a foil of an air-floating radial bearing, including an inner foil 2, wherein the inner foil 2 includes a foil arc structure 21, and two end surfaces of the inner foil 2 are arc structures.
The foil arc structure 21 is formed on the end surface of the inner foil 2 and transits from the non-working surface of the inner foil 2 to the working surface of the inner foil 2 through the end surface of the inner foil 2.
The working surface of the inner foil 2 is coated with a wear-resistant insulating layer. The wear resistance of the inner foil 2 is increased.
In other embodiments, an air-thrust radial bearing is disclosed, comprising the above inner foil 2, in addition to:
a liner foil 3, the liner foil 3 and the inner foil 2 being combined to form a flat foil;
the bump foil 4 is supported on the bump foil 4, and the bump foil 4 provides an elastic foundation for the bump foil;
the bearing comprises a bearing seat 1, wherein a flat foil is circumferentially curled along an inner hole of the bearing seat 1 to form a bearing working surface;
the wave foil piece 4 is arranged between the inner hole wall of the bearing seat 1 and the flat foil piece, the inner hole wall of the bearing seat 1 is further provided with an installation groove, one end of the wave foil piece 4 is bent towards the centrifugal direction to form an installation part, and the installation part of the wave foil piece 4 is clamped in the installation groove. The assembly of the plurality of bump foils 4 is simpler, the fixation of the flat foil and the bump foils 4 is ensured, and the movement in the axial direction is prevented.
One end of each of the lining foil 3 and the inner foil 2 is fixed on the bearing seat 1, and the other end of each of the lining foil and the inner foil is curled along the circumferential direction of an inner hole of the bearing seat 1 to form a free end. The flat foil just covers the bearing seat inner hole wall for one circle, which is beneficial to the radial bearing of the bearing, and the flat foil with proper thickness is selected according to the difference of bearing pressure.
The bearing seat is characterized in that a fixing pin is arranged on the inner hole wall of the bearing seat 1, and the fixing pin fixes the flat foil and the wave foil 4 on the bearing seat 1.
The inner foil 2 is one piece, and the bump foil 4 is a plurality of pieces.
The radial section of the corrugated foil 4 is in a sine wave shape. The sine wave shape only needs to consider the width and the corrugation height when designing the corrugated foil 4, and the design is simple.
The use process comprises the following steps:
the inner foil 2 forms the bearing running surface, the inner foil 2 is supported on the bump foil 4, and the bump foil 4 provides an elastic base for the flat foil and controls the stiffness of the bearing surface. The working principle is that a gas film is formed by utilizing the dynamic pressure effect between the rotor and the surface of the bearing to enable the bearing to be in a nearly suspended state, and the flat foil and the wave foil inside the air-floatation radial bearing play a role in elastic support. An air film is formed between the journal and the inner foil 2, pressure is applied to the inner foil 2, and after the inner foil 2 is pressed, the bump foil is pressed to be elastically deformed, so that bearing force for the journal is formed.
The two ends of the inner foil 2 are designed to be a section of circular arc. The arc design of the foil arc structure 21 is adopted on the two end faces of the inner foil 2, so that the two ends of the inner foil 2 are provided with a section of curve diffusion section structure, the dynamic and static junction area between the rotating shaft and the inner foil 2 is changed on the two ends of the inner foil 2, the contact area between the two ends of the inner foil 2 and the shaft is reduced, and after the arc design of the two ends of the inner foil 2 is adopted, the friction caused by the eccentricity of the bearing is weakened at the moment, and the abrasion is reduced. Thereby improving the radial bearing foil wear.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (8)
1. A foil for an air bearing radial bearing comprising:
an inner foil (2), the inner foil (2) having a working face facing the axis of rotation and a non-working face remote from the axis of rotation;
it is characterized in that the preparation method is characterized in that,
the inner foil (2) comprises a foil arc structure (21), the foil arc structure (21) is formed on the end face of the inner foil (2), and the non-working face of the inner foil (2) is transited to the working face of the inner foil (2) through the end face of the inner foil (2).
2. The foil for an air thrust radial bearing of claim 1, wherein: the curvature of the foil arc structure (21) is gradually reduced from the non-working surface of the inner foil (2) to the working surface of the inner foil (2).
3. The foil for an air thrust radial bearing of claim 2 wherein: the working surface of the inner foil (2) is coated with a wear-resistant insulating layer.
4. An air-bearing radial bearing comprising an inner foil (2) according to any one of claims 1 to 3, characterized in that: also comprises
A liner foil (3), the liner foil (3) and the inner foil (2) being joined to form a flat foil;
a bump foil (4), the flat foil being supported on the bump foil (4), the bump foil (4) providing an elastic basis for the flat foil;
the bearing comprises a bearing seat (1), wherein the flat foil is circumferentially curled along an inner hole of the bearing seat (1) to form a bearing working surface;
the wave foil (4) is arranged between the inner hole wall of the bearing seat (1) and the flat foil, an installation groove is further formed in the inner hole wall of the bearing seat (1), one end of the wave foil (4) is bent towards the centrifugal direction to form an installation part, and the installation part of the wave foil (4) is clamped in the installation groove.
5. The air bearing as set forth in claim 4, wherein: the lining foil (3) and the inner foil (2) are both free ends formed by fixing one end on the bearing seat (1) and curling the other end along the circumferential direction of the inner hole of the bearing seat (1).
6. The air bearing as set forth in claim 4, wherein: the bearing seat is characterized in that a fixing pin is arranged on the inner hole wall of the bearing seat (1), and the fixing pin fixes the flat foil and the corrugated foil (4) on the bearing seat (1).
7. The air bearing as set forth in claim 4, wherein: the inner foil (2) is one piece; the bump foil pieces (4) are multiple pieces.
8. The air bearing as set forth in claim 4, wherein: the radial section of the corrugated foil (4) is in a sine wave shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011008107.2A CN112096733A (en) | 2020-09-23 | 2020-09-23 | Air-floatation radial bearing and foil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011008107.2A CN112096733A (en) | 2020-09-23 | 2020-09-23 | Air-floatation radial bearing and foil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112096733A true CN112096733A (en) | 2020-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011008107.2A Pending CN112096733A (en) | 2020-09-23 | 2020-09-23 | Air-floatation radial bearing and foil |
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| Country | Link |
|---|---|
| CN (1) | CN112096733A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113266636A (en) * | 2021-05-18 | 2021-08-17 | 四川省机械研究设计院(集团)有限公司 | Self-adaptive balanced air film dynamic pressure air bearing structure |
| CN113857785A (en) * | 2021-09-30 | 2021-12-31 | 西安交通大学 | Manufacturing method of patch type radial dynamic pressure gas bearing |
-
2020
- 2020-09-23 CN CN202011008107.2A patent/CN112096733A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113266636A (en) * | 2021-05-18 | 2021-08-17 | 四川省机械研究设计院(集团)有限公司 | Self-adaptive balanced air film dynamic pressure air bearing structure |
| CN113857785A (en) * | 2021-09-30 | 2021-12-31 | 西安交通大学 | Manufacturing method of patch type radial dynamic pressure gas bearing |
| CN113857785B (en) * | 2021-09-30 | 2023-08-15 | 西安交通大学 | Method for manufacturing patch type radial dynamic pressure gas bearing |
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