CN111927876A - Thrust air foil bearing - Google Patents
Thrust air foil bearing Download PDFInfo
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- CN111927876A CN111927876A CN202010864537.8A CN202010864537A CN111927876A CN 111927876 A CN111927876 A CN 111927876A CN 202010864537 A CN202010864537 A CN 202010864537A CN 111927876 A CN111927876 A CN 111927876A
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- foil
- module
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- tightening
- base plate
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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
- F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep 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
- 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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- 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
Abstract
The invention provides a thrust air foil bearing, relates to the technical field of air bearings, and solves the technical problems that the thrust foil bearing needs to be completely scrapped after a top foil is worn and the bearing capacity and stability are not ideal in the prior art. The thrust air foil bearing comprises a top foil module, a bump foil module, a pre-tightening module and a bearing seat, wherein the pre-tightening module, the bump foil module and the top foil module can be sequentially stacked from bottom to top and can be detachably and fixedly arranged on the bearing seat through pins, and the pins can limit circumferential rotation of the top foil module, the bump foil module and the pre-tightening module; the top foil module, the bump foil module, the pre-tightening module and the bearing seat can be sequentially sleeved on the rotor, a wedge-shaped space can be formed between the top foil module and a thrust disc of the rotor, and the pre-tightening module can abut against the bearing seat and provide pre-tightening force for the thrust air foil bearing. The invention is used for reducing the production and manufacturing cost, improving the bearing capacity and increasing the stability of the bearing-rotor system.
Description
Technical Field
The invention relates to the technical field of air bearings, in particular to a dynamic pressure air bearing, and particularly relates to a thrust air foil bearing.
Background
The air foil bearing is a dynamic pressure gas bearing, and is widely applied to turbo machinery such as air compressors, air circulators, micro gas turbines and the like due to the characteristics of high temperature resistance, high rotating speed, oil-free lubrication, small friction loss and the like. The air foil bearing utilizes a wedge effect, gas with certain viscosity in the surrounding environment is dragged into a wedge-shaped air cavity formed by the rotor and a bearing supporting surface by the rotor rotating at high speed along with the increase of the rotating speed of the supporting rotor, and the air pressure of the gas in the wedge-shaped supporting air cavity is increased to support the rotor when the rotating speed of the rotor is increased to a certain speed.
The most widely used and common type of foil thrust gas foil bearing is the wave foil type air foil bearing, which has good stiffness and damping characteristics, and typically comprises three layers: top foil, bump foil and support floor. The top foil and the wave foil respectively comprise a multi-lobe top foil and a wave foil, each lobe of wave foil is fixed on the bottom plate in a welding mode, each lobe of top foil is fixed on the bottom plate in a welding mode, and a structure that the wave foil is supported by the bottom plate and the wave foil supports the top foil is formed. When the rotor and the top foil rotate, the rotor and the top foil form a wedge-shaped space, after the rotor rotates, the top foil needs to overcome starting friction torque, the rotor drags gas with certain viscosity in the surrounding environment into the wedge shape to be compressed, and the rotating speed is increased to a certain degree to suspend the rotor. In the working process, the rotor is started and stopped to cause certain degree of abrasion to the top foil of the bearing, so the service life evaluation standard of the foil bearing is not the working time but the starting and stopping times.
The applicant has found that the prior art has at least the following technical problems:
when the top foil of the existing thrust foil bearing is worn, the thrust foil bearing needs to be completely scrapped, and the scrapping is a waste for the wave foil which is not damaged.
In addition, the load carrying capacity and stability of the existing thrust foil bearings are not ideal.
Disclosure of Invention
The invention aims to provide a thrust air foil bearing to solve the technical problems that the thrust foil bearing is completely scrapped after a top foil is worn and the bearing capacity and stability are not ideal in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a thrust air foil bearing, which comprises a top foil module, a bump foil module, a pre-tightening module and a bearing seat, wherein:
the pre-tightening module, the bump foil module and the top foil module can be sequentially stacked from bottom to top and can be detachably and fixedly mounted on the bearing seat through pins, and the pins can limit circumferential rotation of the top foil module, the bump foil module and the pre-tightening module;
the top foil module, the bump foil module, the pre-tightening module and the bearing seat can be sequentially sleeved on the rotor, a wedge-shaped space can be formed between the top foil module and a thrust disc of the rotor, and the pre-tightening module can abut against the bearing seat and provide pre-tightening force for the thrust air foil bearing.
Further, the top foil module comprises an annular top foil bottom plate and a plurality of fan-shaped top foils, the top foils are uniformly arranged along the circumferential direction of the upper surface of the top foil bottom plate and enclose an annular structure, the upper surface of one side of each top foil is lower than the upper surface of the other side of the top foil, and a wedge-shaped space can be formed between each top foil and the thrust disc of the rotor.
Further, one side of the top foil is fixedly connected to the top foil bottom plate through welding, the top foil module further comprises a top foil gasket, the top foil gasket is fixedly welded to the upper surface of the top foil bottom plate, and the lower surface of the other side of the top foil abuts against the top foil gasket.
Further, the bump foil module comprises an annular bump foil bottom plate and a plurality of fan-shaped bump foil sheets, wherein the bump foil sheets are uniformly distributed on the upper surface of the bump foil bottom plate in the circumferential direction, and the bump foil sheets are fixedly connected to the upper surface of the bump foil bottom plate through welding.
Furthermore, the pre-tightening module comprises an annular pre-tightening layer bottom plate and a pre-tightening structure, the top end of the pre-tightening structure is fixedly connected with the lower surface of the pre-tightening layer bottom plate and is uniformly distributed in the circumferential direction of the lower surface of the pre-tightening layer bottom plate, and the lower part of the pre-tightening structure can abut against the upper surface of the bearing seat and provide pre-tightening force for the thrust air foil bearing.
Furthermore, the pre-tightening structure comprises two elastic pieces, each elastic piece comprises an arc elastic deformation part and supporting arms connected to two ends of the elastic deformation part, the two elastic pieces are arranged in the elastic deformation parts and crossed and fixedly connected to each other, the supporting arms can abut against the upper surface of the bearing seat, and the top end of the pre-tightening structure is fixedly connected with the lower surface of the pre-tightening layer bottom plate through welding.
Furthermore, the pre-tightening module further comprises a pre-tightening layer supporting foil, the pre-tightening layer supporting foil is arranged between the pre-tightening layer bottom plate and the bearing seat, a containing hole is formed in the position, corresponding to the pre-tightening structure, of the pre-tightening layer supporting foil, the lower end of the pre-tightening structure can penetrate through the containing hole and abut against the upper surface of the bearing seat, and the diameter of the containing hole can accommodate elastic deformation of the pre-tightening structure.
Further, the pre-tightening layer bottom plate of the pre-tightening module, the bump foil bottom plate of the bump foil module, the top foil bottom plate of the top foil module and the pre-tightening layer supporting foil are annular thin plates which are made of the same material, have the same thickness and have the same outer diameter and inner diameter.
Furthermore, a plurality of pin holes which are the same in number and correspond to each other in position are formed in the circumferential direction of the pre-tightening layer bottom plate, the wave foil bottom plate, the top foil bottom plate and the pre-tightening layer support foil, and the pins can sequentially penetrate through the pin holes in the top foil bottom plate, the wave foil bottom plate, the pre-tightening layer bottom plate and the pre-tightening layer support foil and fix the pin holes on the bearing seat.
Furthermore, openings are formed in the peripheries of the pre-tightening layer bottom plate, the wave foil bottom plate, the top foil bottom plate and the pre-tightening layer supporting foil sheet and correspond to the pin holes, each opening is communicated with the pin hole, and a pin can be inserted into the pin hole from the opening.
The thrust air foil bearing has the beneficial effects that:
1. because the top foil module, the corrugated foil module and the pre-tightening module are detachably and fixedly connected to the bearing seat through the pins, after the top foil module is worn, the pins are detached, the top foil module can be replaced under the condition that the corrugated foil module is not replaced, and then the top foil module is installed through the pins, so that the production and manufacturing cost is reduced;
2. the top foil module, the wave foil module and the pre-tightening module are laminated to form a plurality of support structures which are connected in series and have different rigidity, so that the rigidity and damping characteristics of the bearing are improved, and the bearing capacity is improved;
3. the pre-tightening module increases the stability of the bearing-rotor system and is beneficial to improving the shock resistance of the thrust air foil bearing supporting rotor system.
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 construction of a thrust air foil bearing of the present invention;
FIG. 2 is a schematic structural view of a thrust air foil bearing top foil module of the present invention;
FIG. 3 is a schematic structural view of a thrust air foil bearing bump foil module of the present invention;
FIG. 4 is a schematic diagram of the construction of a thrust air foil bearing pretensioning module of the present invention;
FIG. 5 is a schematic view of the assembly of the thrust air foil bearing of the present invention;
FIG. 11, top foil; 12. a top foil gasket; 13. a top foil base plate; 110. top foil welding spots 130, top foil pin holes; 21. a bump foil; 22. a bump foil substrate; 210. wave foil welding spots; 220. a bump pin hole; 31. pre-tightening the layer bottom plate; 32. a pre-tightening structure; 33. the pre-tightening layer supports the foil; 310. pre-tightening layer pin holes; 320. pre-tightening the structural welding spot; 330. pre-tightening the support foil pin holes; 331. a housing hole; 4. a bearing seat; 5. a rotor; 6. a thrust disk.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As shown in fig. 1 to 5, the invention provides a thrust air foil bearing, which comprises a top foil module, a bump foil module, a pre-tightening module and a bearing seat 4, wherein the pre-tightening module, the bump foil module and the top foil module can be sequentially stacked from bottom to top and can be detachably and fixedly installed on the bearing seat 4 through pins, and the pins can limit circumferential rotation of the top foil module, the bump foil module and the pre-tightening module;
the top foil module, the bump foil module, the pre-tightening module and the bearing seat 4 can be sequentially sleeved on the rotor 5, a wedge-shaped space can be formed between the top foil module and the thrust disc 6 of the rotor 5, and the pre-tightening module can abut against the bearing seat 4 and provide pre-tightening force for the thrust air foil bearing.
As shown in fig. 5, a group of thrust air foil bearings are respectively arranged on the left side and the right side of a thrust disc of the rotor, and the top foil module, the bump foil module, the pre-tightening module and the bearing block 4 are sequentially sleeved on the rotor 5;
because the top foil module, the corrugated foil module and the pre-tightening module are detachably and fixedly connected to the bearing block 4 through the pins, after the top foil module is worn, the pins are detached, the top foil module can be replaced under the condition that the corrugated foil module is not replaced, and then the top foil module is installed through the pins, so that the production and manufacturing cost is reduced;
the top foil module, the wave foil module and the pre-tightening module are laminated to form a plurality of support structures which are connected in series and have different rigidity, so that the rigidity and damping characteristics of the bearing are improved, and the bearing capacity is improved;
the pre-tightening module increases the stability of the bearing-rotor system and is beneficial to improving the shock resistance of the thrust air foil bearing supporting rotor system.
As an alternative embodiment, the top foil module includes an annular top foil bottom plate 13 and a plurality of fan-shaped top foils 11, the top foils 11 are uniformly arranged along the circumference of the upper surface of the top foil bottom plate 13 and enclose an annular structure, the upper surface of one side of the top foils 11 is lower than the upper surface of the other side of the top foils 11, and a wedge-shaped space can be formed between the top foils 11 and the thrust disc 6 of the rotor 5.
The fan-shaped top foils 11 are uniformly distributed in the circumferential direction of the annular top foil bottom plate 13 and form an annular structure in a surrounding mode, a circumferential gap exists between every two adjacent top foils 11, each fan-shaped top foil 11 consists of an outer arc, an inner arc and two side edges, the diameter of the inner arc of each fan-shaped top foil 11 is the same as the inner diameter of the top foil bottom plate 13, and the diameter of the outer arc of each top foil 11 is smaller than the outer diameter of the top foil bottom plate 13; one side edge of the top foil sheet 11 is fixedly connected to the upper surface of the top foil bottom plate 13 through spot welding, and the spot welding positions, namely top foil welding points 110, are uniformly distributed along the radial direction of the side edge; in order to form a wedge-shaped space between the upper surface of the top foil 11 and the thrust disc 6 of the rotor 5, the upper surface of one side of the top foil 11 needs to be lower than the upper surface of the other side of the top foil 11, which can be realized by making one side thinner and the other side thicker during the manufacture of the top foil 11, or by arranging a gasket between the other side of the top foil 11 and the top foil bottom plate 13.
As an alternative embodiment, one side of the top foil sheet 11 is fixedly connected to the top foil base plate 13 by welding, the top foil module further includes a top foil spacer 12, the top foil spacer 12 is fixedly connected to the upper surface of the top foil base plate 13 by welding, and the lower surface of the other side of the top foil sheet 11 abuts against the top foil spacer 12.
The thickness of the top foil spacer 12 can be customized according to actual needs so as to adjust the height of the wedge, that is, the included angle between the top foil 11 and the top foil bottom plate 13, so as to maintain the wedge effect in normal operation of the bearing, the top foil spacer 12 is also fan-shaped, the outer arc diameter and the inner arc diameter of the top foil spacer 12 are both the same as those of the top foil 11, and the top foil spacer 12 is narrower than the top foil 11.
As an alternative embodiment, the bump foil module includes an annular bump foil base plate 22 and a plurality of fan-shaped bump foil pieces 21, the bump foil pieces 21 are uniformly distributed on the upper surface of the bump foil base plate 22 in the circumferential direction, and the bump foil pieces 21 are fixedly connected to the upper surface of the bump foil base plate 22 by welding.
The top foil bottom plate 13 is abutted against the wave foil piece 21 of the wave foil module, and the wave foil piece 21 of the wave foil module can generate tiny elastic deformation when receiving the bearing force in the vertical direction, so that the bearing capacity of the bearing is improved;
one side edge of the bump sheet 21 is fixedly connected to the upper surface of the bump base plate 22 by spot welding, and the spot welding positions, i.e., bump welding points 210, are uniformly distributed along the radial direction of the side edge.
As an alternative embodiment, the pre-tightening module includes an annular pre-tightening layer bottom plate 31 and a pre-tightening structure 32, the top end of the pre-tightening structure 32 is fixedly connected with the lower surface of the pre-tightening layer bottom plate 31 and is uniformly distributed on the circumference of the lower surface of the pre-tightening layer bottom plate 31, and the lower portion of the pre-tightening structure 32 can abut against the upper surface of the bearing seat 4 and provide pre-tightening force for the thrust air foil bearing.
The pre-tightening module provides pre-tightening force for the thrust foil bearing in work so as to improve the stability of a system and increase the shock resistance of a bearing-rotor 5 system, the top end of the pre-tightening structure 32 is fixed on the lower surface of the pre-tightening layer bottom plate 31 through welding, and the pre-tightening structure 32 is an elastic piece and can generate pre-tightening force in the vertical direction of the pre-tightening layer bottom plate 31.
As an alternative embodiment, the pre-tightening structure 32 includes two elastic members, each elastic member includes an arc-shaped elastic deformation portion and support arms connected to two ends of the elastic deformation portion, the two elastic members are crossed and fixedly connected in the elastic deformation portion, the support arms can abut against the upper surface of the bearing seat 4, and the top end of the pre-tightening structure 32 is fixedly connected with the lower surface of the pre-tightening layer bottom plate 31 by welding.
The top end of the pre-tightening structure 32, namely the intersection point of the two elastic deformation parts, namely a pre-tightening structure welding point 320, is fixedly connected with the lower surface of the pre-tightening layer bottom plate 31 through welding;
the pre-tightening structure 32 adopts two cross elastic members, so that the pre-tightening structure 32 comprises four supporting arms abutting against the upper surface of the bearing seat 4, and of course, more cross elastic members can be adopted, for example, three elastic members are snowflake-shaped and the pre-tightening structure 32 with six supporting arms provides larger pre-tightening force.
As an optional embodiment, the pre-tightening module further includes a pre-tightening layer support foil 33, the pre-tightening layer support foil 33 is disposed between the pre-tightening layer base plate 31 and the bearing seat 4, a containing hole 331 is disposed on the pre-tightening layer support foil 33 at a position corresponding to the pre-tightening structure 32, a lower end of the pre-tightening structure 32 can penetrate through the containing hole 331 and abut against an upper surface of the bearing seat 4, and the diameter of the containing hole 331 can accommodate elastic deformation of the pre-tightening structure 32.
The pre-tightening layer supporting foil 33 is also annular, the pre-tightening layer supporting foil 33 can be sleeved on the rotor 5 and is positioned between the bearing seat 4 and the pre-tightening layer bottom plate 31, the pre-tightening layer supporting foil 33 is also provided with pre-tightening supporting foil pin holes at corresponding positions like the pre-tightening layer bottom plate 31, the bump foil bottom plate 22 and the top foil bottom plate 13, and pins can penetrate through the pre-tightening supporting foil pin holes and limit circumferential rotation of the pre-tightening supporting foil pin holes;
no matter the pre-tightening structure 32 is in an elastic deformation state or an inelastic deformation state, the accommodating hole 331 of the pre-tightening layer support foil 33 can accommodate the pre-tightening structure 32 therein, so that a certain accommodating space is formed for the pre-tightening structure 32.
As an alternative embodiment, the pre-tightening layer bottom plate 31 of the pre-tightening module, the bump foil bottom plate 22 of the bump foil module, the top foil bottom plate 13 of the top foil module, and the pre-tightening layer supporting foil 33 are annular thin plates with the same material, the same thickness, the same outer diameter, and the same inner diameter.
If the bottom plate 31 of the pre-tightening layer, the wave foil bottom plate 22, the top foil bottom plate 13 and the support foil 33 of the pre-tightening layer are annular thin plates with the same material, the same thickness, the same outer diameter and the same inner diameter, the uniform processing can be realized during production and processing, and the separate manufacturing is not needed, so the production and processing cost is saved; only other components except for the pre-tightening layer bottom plate 31, the wave foil bottom plate 22 and the top foil bottom plate 13 in the pre-tightening module, the wave foil module and the top foil module need to be processed and assembled; and the containing hole 331 on the pre-tightening layer supporting foil 33 is processed by punching independently.
As an optional embodiment, a plurality of pin holes with the same number and corresponding positions are formed in the circumferential direction of the pre-tightening layer bottom plate 31, the bump foil bottom plate 22, the top foil bottom plate 13 and the pre-tightening layer support foil 33, and the pins can sequentially penetrate through the pin holes in the top foil bottom plate 13, the bump foil bottom plate 22, the pre-tightening layer bottom plate 31 and the pre-tightening layer support foil 33 and are fixed on the bearing block 4.
Similarly, a plurality of pin holes which are the same in number and correspond in position are formed in the circumferential direction of the pre-tightening layer bottom plate 31, the wave foil bottom plate 22, the top foil bottom plate 13 and the pre-tightening layer supporting foil 33 which are made of the same material, the same in thickness, the same in outer diameter and inner diameter, for example, the distance from the center of each pin hole to the center of the bottom plate is equal, namely, the centers of the pin holes are arranged on the circumference of the same circle, and the pin holes are uniformly distributed along the circumference of the circle, so that the pin holes can be uniformly machined on the bottom plate without being manufactured respectively, and the production and machining cost is saved.
As an alternative embodiment, the top foil bottom plate 13, the bump foil bottom plate 22, the pre-tightening layer bottom plate 31 and the pre-tightening layer support foil 33 are provided with openings at positions corresponding to each pin hole on the periphery, each opening is communicated with the pin hole, and a pin can be inserted into the pin hole from the opening.
During assembly and disassembly, each pin needs to be inserted into corresponding pin holes in the top foil bottom plate 13, the corrugated foil bottom plate 22, the pre-tightening layer bottom plate 31 and the pre-tightening layer support foil 33 in sequence, namely the top foil pin hole, the corrugated foil pin hole, the pre-tightening layer pin hole and the pre-tightening layer support foil pin hole, and is relatively labor-saving, if openings communicated with the pin holes are formed in the peripheries of the top foil bottom plate 13, the corrugated foil bottom plate 22, the pre-tightening layer bottom plate 31 and the pre-tightening layer support foil 33 and in positions corresponding to the pin holes, the pins only need to be inserted into the corresponding pin holes from the top foil bottom plate 13, the corrugated foil bottom plate 22, the pre-tightening layer bottom plate 31 and the pre-tightening layer.
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. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
In the description of the present invention, it is to be noted that "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
Claims (10)
1. A thrust air foil bearing comprising a top foil module, a bump foil module, a pretension module, and a bearing mount, wherein:
the pre-tightening module, the bump foil module and the top foil module can be sequentially stacked from bottom to top and can be detachably and fixedly mounted on the bearing seat through pins, and the pins can limit circumferential rotation of the top foil module, the bump foil module and the pre-tightening module;
the top foil module, the bump foil module, the pre-tightening module and the bearing seat can be sequentially sleeved on the rotor, a wedge-shaped space can be formed between the top foil module and a thrust disc of the rotor, and the pre-tightening module can abut against the bearing seat and provide pre-tightening force for the thrust air foil bearing.
2. The thrust air foil bearing of claim 1, wherein the top foil module comprises an annular top foil base plate and a plurality of fan-shaped top foils, the top foils are uniformly arranged along the circumference of the upper surface of the top foil base plate and enclose an annular structure, the upper surface of one side of the top foils is lower than the upper surface of the other side of the top foils, and a wedge-shaped space can be formed between the top foils and a thrust disk of the rotor.
3. The thrust air foil bearing of claim 2, wherein one side of the top foil is fixedly attached to the top foil base plate by welding, the top foil module further comprising a top foil spacer, the top foil spacer being fixed to an upper surface of the top foil base plate by welding, a lower surface of the other side of the top foil abutting the top foil spacer.
4. The thrust air foil bearing of claim 1, wherein the bump foil module comprises an annular bump foil base plate and a plurality of fan-shaped bump foil pieces, the bump foil pieces are evenly distributed on the upper surface of the bump foil base plate in the circumferential direction, and the bump foil pieces are fixedly connected to the upper surface of the bump foil base plate by welding.
5. The thrust air foil bearing of claim 1, wherein the pre-tensioning module comprises an annular pre-tensioning layer base plate and pre-tensioning structures, the top ends of the pre-tensioning structures are fixedly connected with the lower surface of the pre-tensioning layer base plate and are uniformly distributed on the circumference of the lower surface of the pre-tensioning layer base plate, and the lower portions of the pre-tensioning structures can abut against the upper surface of the bearing seat and provide pre-tensioning force for the thrust air foil bearing.
6. Thrust air foil bearing according to claim 5, wherein the pre-tensioning structure comprises two elastic elements, the elastic elements comprising an arc-shaped elastic deformation part and support arms connected to both ends of the elastic deformation part, the two elastic elements are crossed in the elastic deformation part and fixedly connected, the support arms can abut against the upper surface of the bearing seat, and the top end of the pre-tensioning structure is fixedly connected with the lower surface of the pre-tensioning layer base plate by welding.
7. The thrust air foil bearing of claim 5, wherein the pre-tensioning module further comprises a pre-tensioning layer supporting foil, the pre-tensioning layer supporting foil is disposed between the pre-tensioning layer bottom plate and the bearing seat, a containing hole is formed in a position, corresponding to the pre-tensioning structure, on the pre-tensioning layer supporting foil, the lower end of the pre-tensioning structure can penetrate through the containing hole and abut against the upper surface of the bearing seat, and the diameter of the containing hole can accommodate elastic deformation of the pre-tensioning structure.
8. The thrust air foil bearing of claim 7, wherein the pre-tensioned layer bottom plate of the pre-tensioned module, the bump foil bottom plate of the bump foil module, the top foil bottom plate of the top foil module, and the pre-tensioned layer support foil are annular sheets of the same material, the same thickness, the same outer diameter, and the same inner diameter.
9. The thrust air foil bearing of claim 8, wherein the pre-tensioned layer base plate, the bump foil base plate, the top foil base plate and the pre-tensioned layer support foil are circumferentially provided with a plurality of pin holes having the same number and corresponding positions, and the pins can sequentially pass through the pin holes of the top foil base plate, the bump foil base plate, the pre-tensioned layer base plate and the pre-tensioned layer support foil and fix the pin holes on the bearing seat.
10. The thrust air foil bearing of claim 9, wherein openings are provided in the outer periphery of said pre-tensioned layer base plate, said bump foil base plate, said top foil base plate and said pre-tensioned layer support foil at positions corresponding to each of said pin holes, each of said openings communicating with said pin hole, and a pin is insertable into said pin hole through said openings.
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|---|---|---|---|
| CN202010864537.8A CN111927876A (en) | 2020-08-25 | 2020-08-25 | Thrust air foil bearing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010864537.8A CN111927876A (en) | 2020-08-25 | 2020-08-25 | Thrust air foil bearing |
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| CN111927876A true CN111927876A (en) | 2020-11-13 |
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| CN202010864537.8A Pending CN111927876A (en) | 2020-08-25 | 2020-08-25 | Thrust air foil bearing |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113685433A (en) * | 2021-08-24 | 2021-11-23 | 珠海格力电器股份有限公司 | Gas thrust bearing, rotating shaft and compressor |
| CN114033790A (en) * | 2021-12-01 | 2022-02-11 | 中车株洲电机有限公司 | Combined air-float thrust bearing and mechanical equipment |
| CN114718897A (en) * | 2022-05-17 | 2022-07-08 | 烟台东德实业有限公司 | High-speed centrifugal air compressor based on insert type air bearing |
| CN114962440A (en) * | 2022-05-13 | 2022-08-30 | 烟台东德实业有限公司 | Air bearing based on submerged type bump foil and insert |
| CN115143183A (en) * | 2021-03-31 | 2022-10-04 | 纽若斯有限公司 | Gas foil thrust bearing |
| CN115263912A (en) * | 2022-07-30 | 2022-11-01 | 广东美的暖通设备有限公司 | Axial bearing, compressor and heating and ventilation equipment |
| WO2023279589A1 (en) * | 2021-07-07 | 2023-01-12 | 鑫磊压缩机股份有限公司 | Air suspension radial bearing and hydrogen energy compressor |
| CN115789076A (en) * | 2023-01-09 | 2023-03-14 | 天津飞旋科技股份有限公司 | Foil dynamic pressure bearing and rotating mechanical shaft system |
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2020
- 2020-08-25 CN CN202010864537.8A patent/CN111927876A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115143183A (en) * | 2021-03-31 | 2022-10-04 | 纽若斯有限公司 | Gas foil thrust bearing |
| WO2023279589A1 (en) * | 2021-07-07 | 2023-01-12 | 鑫磊压缩机股份有限公司 | Air suspension radial bearing and hydrogen energy compressor |
| CN113685433A (en) * | 2021-08-24 | 2021-11-23 | 珠海格力电器股份有限公司 | Gas thrust bearing, rotating shaft and compressor |
| 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 |
| CN114033790A (en) * | 2021-12-01 | 2022-02-11 | 中车株洲电机有限公司 | Combined air-float thrust bearing and mechanical equipment |
| CN114033790B (en) * | 2021-12-01 | 2023-05-16 | 中车株洲电机有限公司 | Combined air-bearing thrust bearing and mechanical equipment |
| CN114962440A (en) * | 2022-05-13 | 2022-08-30 | 烟台东德实业有限公司 | Air bearing based on submerged type bump foil and insert |
| CN114718897A (en) * | 2022-05-17 | 2022-07-08 | 烟台东德实业有限公司 | High-speed centrifugal air compressor based on insert type air bearing |
| CN114718897B (en) * | 2022-05-17 | 2023-03-14 | 烟台东德实业有限公司 | High-speed centrifugal air compressor based on insert type air bearing |
| CN115263912A (en) * | 2022-07-30 | 2022-11-01 | 广东美的暖通设备有限公司 | Axial bearing, compressor and heating and ventilation equipment |
| CN115789076A (en) * | 2023-01-09 | 2023-03-14 | 天津飞旋科技股份有限公司 | Foil dynamic pressure bearing and rotating mechanical shaft system |
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