CN112160980A - Gas dynamic pressure bearing, motor and compressor - Google Patents
Gas dynamic pressure bearing, motor and compressor Download PDFInfo
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- CN112160980A CN112160980A CN202010869800.2A CN202010869800A CN112160980A CN 112160980 A CN112160980 A CN 112160980A CN 202010869800 A CN202010869800 A CN 202010869800A CN 112160980 A CN112160980 A CN 112160980A
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- bearing
- gas dynamic
- dynamic pressure
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- 239000011888 foil Substances 0.000 claims abstract description 113
- 230000008093 supporting effect Effects 0.000 claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000002093 peripheral effect Effects 0.000 claims description 19
- 230000013011 mating Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 7
- 230000001050 lubricating effect Effects 0.000 description 7
- 239000012528 membrane Substances 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000005489 elastic deformation Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- F16C17/04—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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
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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
- 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
- F16C2380/00—Electrical apparatus
- F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
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 application provides a gas dynamic pressure bearing, motor and compressor. This gaseous dynamic pressure bearing includes top foil (1), middle supporting unit (2) and bearing frame (3), middle supporting unit (2) fixed mounting is on bearing frame (3), top foil (1) fixed mounting is on middle supporting unit (2), top foil (1) is integral annular structure, top foil (1) has bearing surface (4) of keeping away from middle supporting unit (2), bearing surface (4) are including plane portion (5) and the lower water conservancy diversion portion (6) of arranging in turn along the circumference of top foil (1), plane portion (5) and lower water conservancy diversion portion (6) connect gradually end to end, lower water conservancy diversion portion (6) are configured as with the air current water conservancy diversion to plane portion (5). According to the gas dynamic pressure bearing, the consistency of the top foil in the working process can be enhanced, and the rigidity and the bearing capacity of the bearing are improved.
Description
Technical Field
The application relates to the technical field of air conditioning, in particular to a gas dynamic pressure bearing, a motor and a compressor.
Background
The axial gas dynamic pressure bearing is an elastic support dynamic pressure gas bearing, and the rotor is suspended by generating a fluid dynamic pressure effect through the gas flow between the bearing and the rotor driven by the high-speed rotation of the rotor. The gas dynamic pressure bearing has the advantages of high precision, no pollution, high speed, simple structure and the like, and is widely applied to high-speed rotating machinery such as an oilless turbine of an aircraft engine, a low-temperature expander, an air cycle machine of an airplane and the like at home and abroad.
The current common axial gas dynamic pressure bearing structure comprises a flat foil, a supporting structure and a bearing seat, wherein a section of the flat foil and the supporting structure are clamped on the bearing seat by spot welding or a bolt. When the rotor rotates at a high speed, air film pressure is formed between the rotor and the flat foil, and the flat foil and the supporting corrugated sheet generate elastic deformation, so that the air film gap is increased, and rigidity and bearing capacity are provided for the bearing.
The prior art discloses a thrust air foil bearing that is adaptable and has a high load capacity. The bearing structure includes: a thin foil bottom plate, an arc structure, a bump foil, a top foil and a boss structure. This bearing adopts a plurality of top foils to set gradually along circumference, and every section top foil all is in the same place with thin foil piece bottom plate welded fastening, because each top foil all sets up alone, and the cooperation precision between every top foil and the thin foil piece bottom plate all probably is different, and top foil quantity is more, and the error is big more, consequently leads to each top foil relatively poor in the uniformity of working process, has reduced the rigidity and the bearing capacity of bearing.
Disclosure of Invention
Therefore, the technical problem to be solved by the application is to provide a gas dynamic pressure bearing, a motor and a compressor, which can enhance the consistency of a top foil in the working process and improve the rigidity and the bearing capacity of the bearing.
In order to solve the above problems, the present application provides a pneumatic dynamic pressure bearing, including top paper tinsel, middle supporting unit and bearing frame, middle supporting unit fixed mounting is on the bearing frame, top paper tinsel fixed mounting is on middle supporting unit, top paper tinsel is integral annular structure, top paper tinsel has the loading end of keeping away from middle supporting unit, the loading end includes along the plane portion and the lower water conservancy diversion portion of arranging in turn of the circumference of top paper tinsel, plane portion and lower water conservancy diversion portion connect gradually end to end, lower water conservancy diversion portion is configured as with air current water conservancy diversion to plane portion.
Preferably, the planar portion is perpendicular to the central axis of the top foil.
Preferably, the lower concave flow guiding part comprises a flow guiding section and a flow guiding section, the length of the flow guiding section is greater than that of the flow guiding section, and the flow guiding section is located on the front side of the flow guiding section along the flowing direction of the gas.
Preferably, the flow guiding section is an inclined plane, and the flow guiding section is an arc surface.
Preferably, the circumferential widths of the plane part and the lower concave flow guide part are the same; or the circumferential widths of the plane part and the lower concave flow guide part are different.
Preferably, the top foil has a mating surface facing the intermediate support unit, the mating surface including a recessed portion and a protruding portion, the recessed portion being recessed in a direction away from the intermediate support unit, the protruding portion protruding toward the intermediate support unit, the recessed portion being disposed corresponding to the planar portion, and the protruding portion being disposed corresponding to the recessed flow guide portion.
Preferably, the top of the projection is a flat surface, the top flat surface of the projection forming a surface fit with the intermediate support unit.
Preferably, the recess extends in a radial direction of the top foil and through the top foil.
Preferably, the intermediate support unit includes a flat plate having an annular shape, and the projection is supported on a plate surface of the flat plate.
Preferably, the bearing seat is supported on a side of the flat plate remote from the top foil, the bearing seat comprising a support face on which a projection is provided, the projection being arranged corresponding to the recess and being able to be received in the recess.
Preferably, the projection pattern of the convex block and the projection pattern of the concave part on the supporting surface are similar patterns, and the projection of the convex block completely falls within the projection range of the concave part.
Preferably, the top foil and the intermediate support unit are fixed in a snap fit.
Preferably, the middle supporting unit is of an annular structure, first clamping blocks are arranged on the outer peripheral side and/or the inner peripheral side of the middle supporting unit at intervals along the circumferential direction, first clamping grooves are arranged on the outer peripheral side and/or the inner peripheral side of the top foil, and the first clamping blocks are bent towards the first clamping grooves and clamped into the first clamping grooves.
Preferably, the first catching groove is provided on an outer circumferential surface corresponding to the protrusion, and the first catching block is provided at a corresponding position of the intermediate supporting unit.
Preferably, the width of the first clamping block increases progressively along the radial direction away from the outer peripheral surface of the middle supporting unit, and the width of the first clamping groove increases progressively along the direction away from the matching surface.
Preferably, the intermediate support unit and the bearing seat are clamped and fixed.
Preferably, when the supporting surface is provided with the protruding block, the middle supporting unit is of an annular structure, second clamping blocks are arranged on the outer peripheral side and/or the inner peripheral side of the middle supporting unit at intervals along the circumferential direction, second clamping grooves are arranged on the radial inner side and/or the radial outer side of the protruding block, and the second clamping blocks are bent towards the second clamping grooves and clamped into the second clamping grooves.
Preferably, the width of the second clamping block increases along the radial direction far away from the outer peripheral surface of the middle supporting unit, and the width of the second clamping groove increases along the direction far away from the middle supporting unit.
Preferably, the intermediate support unit is a foil arch.
According to another aspect of the present application, there is provided a motor including a gas dynamic bearing, which is the gas dynamic bearing described above.
According to another aspect of the present application, there is provided a compressor including a gas dynamic bearing, which is the gas dynamic bearing described above.
The utility model provides a gaseous dynamic pressure bearing, including top paper tinsel, middle supporting unit and bearing frame, middle supporting unit fixed mounting is on the bearing frame, top paper tinsel fixed mounting is on middle supporting unit, top paper tinsel is integral annular structure, top paper tinsel has the loading end of keeping away from middle supporting unit, the loading end includes along the plane portion and the lower water conservancy diversion portion of arranging in turn of the circumference of top paper tinsel, plane portion and lower water conservancy diversion portion connect gradually end to end, lower water conservancy diversion portion is configured as with air current water conservancy diversion to plane portion. The gas dynamic pressure bearing is an axial gas dynamic pressure bearing, a top foil of the gas dynamic pressure bearing adopts an integral structure, a supporting surface of the top foil adopts a plane part and a concave guide part which are alternately arranged in the circumferential direction, air flow can be guided into the plane part by utilizing the concave guide part, a lubricating gas film is formed between the plane part and a rotor, the rotor and the bearing surface are separated to play a role of lubrication, because the top foil adopts the integral structure and is directly arranged on a middle supporting unit, the mounting difficulty of the top foil is reduced, the mounting efficiency of the top foil is improved, the processing and the mounting are more convenient and quicker, the difficulty of the preparation and forming process is smaller, the cost is lower, the integral top foil is adopted, the integral consistency of the top foil can be better, the supporting acting force and the deformation acting force of each plane part and the concave guide part which are arranged in the circumferential direction of the top foil can be more uniformly distributed, and errors generated in the mounting, the deformation of the whole top foil along the axial direction is uniformly distributed, the deformation of the top foil under the same load condition is relatively small, and the rigidity and the bearing capacity of the bearing are effectively improved.
Drawings
Fig. 1 is a perspective view of a gas dynamic bearing according to an embodiment of the present application;
FIG. 2 is a side view structural view of a gas dynamic pressure bearing according to an embodiment of the present application;
FIG. 3 is an enlarged structural view of the aerodynamic bearing of FIG. 2 at A;
fig. 4 is a perspective view of a top foil of the aerodynamic bearing according to the embodiment of the present application;
FIG. 5 is a side view structural view of a top foil of the gas dynamic pressure bearing of the embodiment of the present application;
FIG. 6 is an enlarged structural view of the top foil of the aerodynamic bearing of FIG. 5 at B;
fig. 7 is a perspective view of an intermediate support unit of a gas dynamic bearing according to an embodiment of the present application;
fig. 8 is a perspective view of a bearing housing of the gas dynamic bearing according to the embodiment of the present application.
The reference numerals are represented as:
1. a top foil; 2. an intermediate support unit; 3. a bearing seat; 4. a bearing surface; 5. a planar portion; 6. a concave diversion part; 7. a drainage section; 8. a flow guide section; 9. a mating surface; 10. a recessed portion; 11. a projection; 12. a support surface; 13. a bump; 14. a first clamping block; 15. a first card slot; 16. a second fixture block; 17. and a second card slot.
Detailed Description
With combined reference to fig. 1 to 8, according to an embodiment of the present application, the aerodynamic bearing includes a top foil 1, an intermediate support unit 2, and a bearing seat 3, the intermediate support unit 2 is fixedly mounted on the bearing seat 3, the top foil 1 is fixedly mounted on the intermediate support unit 2, the top foil 1 is of an integral annular structure, the top foil 1 has a bearing surface 4 away from the intermediate support unit 2, the bearing surface 4 includes a planar portion 5 and a lower concave flow guide portion 6 alternately arranged in a circumferential direction of the top foil 1, the planar portion 5 and the lower concave flow guide portion 6 are sequentially connected end to end, and the lower concave flow guide portion 6 is configured to guide an airflow to the planar portion 5.
The gas dynamic pressure bearing is an axial gas dynamic pressure bearing, a top foil 1 of the gas dynamic pressure bearing adopts an integral structure, a supporting surface of the top foil 1 adopts a plane part 5 and a concave guide part 6 which are alternately arranged in the circumferential direction, air flow can be guided into the plane part 5 by utilizing the concave guide part 6, a lubricating air film is formed between the plane part 5 and a rotor, the rotor and the bearing surface are separated, and a lubricating effect is achieved, because the top foil 1 adopts the integral structure and is directly arranged on a middle supporting unit 2, the mounting difficulty of the top foil 1 is reduced, the mounting efficiency of the top foil 1 is improved, the processing and the mounting are more convenient and quicker, the difficulty of the preparation and the forming process is smaller, the cost is lower, in addition, the integral top foil 1 is adopted, the integral concave consistency of the top foil 1 can be better, the supporting acting force and the deformation acting force of each plane part 5 and each guide part 6 which are arranged in, the error generated in the installation process of the top foils 1 can be effectively reduced, so that the deformation of the whole top foil 1 along the axial direction is uniformly distributed, the deformation of the top foil 1 under the same load condition is relatively small, and the rigidity and the bearing capacity of the bearing are effectively improved.
The plane part 5 is perpendicular to the central axis of the top foil 1, so that the plane part 5 can be parallel to the end surface of the motor rotor matched with the plane part 5, a lubricating air film with uniform thickness is formed, the stability of the support effect of the gas dynamic pressure bearing is effectively improved, and the rigidity and the bearing capacity of the bearing are improved.
In one embodiment, the lower concave flow guide part 6 comprises a flow guide section 7 and a flow guide section 8, the length of the flow guide section 7 is greater than that of the flow guide section 8, and the flow guide section 7 is positioned on the front side of the flow guide section 8 along the flowing direction of the gas. In this embodiment, the intersection position of the flow guiding section 7 and the flow guiding section 8 is the deepest position of the lower concave flow guiding portion 6, and because the flow guiding section 7 is located on the front side of the flow guiding section 8 along the flow direction of the air flow, the air will flow through the flow guiding section 7 first, reach the flow guiding section 8 after reaching the intersection position of the flow guiding section 7 and the flow guiding section 8, and then flow towards the plane portion 5 along the flow guiding direction of the flow guiding section 8. The length of drainage section 7 is greater than the length of water conservancy diversion section 8, and the air current of being convenient for slowly flows to water conservancy diversion section 8 department along drainage section 7, then flows to plane portion 5 with great velocity of flow under the water conservancy diversion effect of water conservancy diversion section 8, forms lubricated air film between plane portion 5 and rotor more easily, has guaranteed the smooth and easy nature and the continuity that the air current flows, has guaranteed the stability of lubricated air film structure, has improved bearing job stabilization nature and reliability.
In an optional embodiment, the flow guiding section 7 is an inclined plane, the flow guiding section 8 is an arc surface, the inclined plane is convenient for guiding the airflow to the flow guiding section 8 gently, and the flow guiding section 8 with the arc surface can reduce airflow steering resistance and reduce airflow flowing loss, so that the airflow can flow onto the plane part 5 along the flow guiding of the flow guiding section 8 more smoothly.
In one embodiment, the circumferential widths of the planar portion 5 and the lower concave flow guide portion 6 are the same.
In another embodiment, the circumferential widths of the planar portion 5 and the lower concave flow guide portion 6 are different.
The widths of the plane part 5 and the lower concave guide part 6 can be the same or different, and can be determined according to the application of the gas dynamic pressure bearing. Generally speaking, the width phase difference between the two is not big, so that the top foil 1 can have enough gas guide areas and enough plane support areas, the airflow is conveniently guided to the plane part 5, a lubricating air film is formed, the area of the lubricating air film between the plane part 5 and the rotor can be ensured, the stability of the lubricating air film is ensured, and the gas dynamic pressure bearing can apply stable and reliable bearing force to the rotor.
The top foil 1 has a mating surface 9 facing the intermediate support unit 2, the mating surface 9 comprising a recessed portion 10 and a protruding portion 11, the recessed portion 10 being recessed in a direction away from the intermediate support unit 2, the protruding portion 11 protruding towards the intermediate support unit 2, the recessed portion 10 being arranged corresponding to the planar portion 5, and the protruding portion 11 being arranged corresponding to the lower concave flow guide portion 6. In the present embodiment, by forming the recess 10 and the projection 11 on the mating face toward the intermediate support unit 2, and the concave parts 10 and the convex parts 11 are alternately arranged along the circumferential direction, the concave parts 10 are arranged corresponding to the plane part 5, the convex parts 11 are arranged corresponding to the lower concave flow guiding part 6, the bottom of the plane part 5 with higher height relative to the lower concave flow guide part 6 can form a deformation space, and the bottom of the lower concave flow guide part with lower height relative to the plane part 5 forms a supporting structure contacted with the middle supporting unit 2, so that in the working process of the gas dynamic pressure bearing, under the action of contact load, the top foil 1 has enough deformation capacity through the concave part 10, thereby greatly enhancing the self-adaptability of the bearing, providing bearing capacity for the bearing, meanwhile, the top foil 1 can form a stable supporting function through the convex part 11, and the working stability and reliability of the bearing are ensured.
In one embodiment, the top of the protruding portion 11 is a plane, and the top plane of the protruding portion 11 forms a surface fit with the middle supporting unit 2, so that a larger contact area can be formed between the top plane of the protruding portion 11 and the middle supporting unit 2, the stress distribution of the top plane and the surface of the middle supporting unit 2 is more uniform, and the overall structure is more stable.
In an alternative embodiment, the recesses 10 extend in the radial direction of the top foil 1 and extend through the top foil 1, enabling the recesses 10 to extend through in the radial direction of the top foil 1, which may have a better deformability.
In one embodiment, the intermediate support unit 2 comprises a flat plate having an annular shape, and the projection 11 is supported on a plate surface of the flat plate. The annular flat plate is of a unitary construction, and in one alternative embodiment is of a resilient diaphragm construction, and the thickness and diameter of the diaphragm can be varied during bearing design to achieve a desired stiffness and damping of the axial bearing. The top foil 1 and the membrane in the embodiment are integrally formed, and the membrane supports the top foil 1, so that the deformation of the membrane along the axial direction is uniformly distributed. During operation of the bearing, the bearing top foil 1 and the membrane are elastically deformed and provide a bearing force due to the gas lubrication effect. Under the same load condition, the deformation of the diaphragm is relatively small, the stress on the surfaces of the top foil 1 and the diaphragm is uniform, and a gap effect is formed between the top foil 1 and the diaphragm, so that the rigidity and the bearing capacity of the bearing are effectively improved, the complexity of a bearing system is reduced, the bearing research and development period is shortened, the manufacturing cost is reduced, and the anti-interference capability of the system during operation is improved.
The bearing support 3 is supported on the side of the flat plate remote from the top foil 1, the bearing support 3 comprises a support surface 12, a projection 13 is arranged on the support surface 12, the projection 13 is arranged corresponding to the recess 10, and can be accommodated in the recess 10. Because the lug 13 protrudes from the supporting surface 12 and can be accommodated into the concave part 10, and the membrane is positioned between the lug 13 and the concave part 10, the membrane can move towards the concave space of the concave part 10 and can also move towards the two sides of the lug 13, so that the membrane forms the effect similar to that of an arched foil under the supporting effect of the lug 13 and can form a better matching relation with the top foil 1.
The projection patterns of the convex block 13 and the concave part 10 on the supporting surface 12 are similar patterns, and the projection of the convex block 13 completely falls into the projection range of the concave part 10, so that the movement of the convex block 13 towards the concave part 10 is not hindered, and the deformation space of the diaphragm can be expanded. In the present embodiment, specifically, the concave portion 10 has a concave fan-shaped structure, the convex portion 11 has a horizontal fan-shaped structure, the convex portion 13 has a fan-shaped convex portion matching with the concave fan-shaped structure of the concave portion 10, and the cross section of the fan-shaped segment has a trapezoid shape, a rectangular shape, an arc shape, and the like.
The pneumatic dynamic pressure bearing in this embodiment, the surface equipartition of top foil 1 has plane portion 5 and recessed water conservancy diversion portion 6, through the sunken degree of depth and the circumferential width of adjusting recessed water conservancy diversion portion 6, can design the bearing that has different bearing capacity characteristics, the bearing's bearing is constituteed to the depressed part 10 of top foil 1 lower surface, the lug 13 of diaphragm horizontal plane and bearing frame 3 upper surface, the bearing takes place elastic deformation at contact load effect under construction, the self-adaptability of bearing has greatly been strengthened, provide the bearing capacity for the bearing.
In the bearing operation process, the rotor rubs the surface of the top foil 1 at a high speed to generate high temperature, so the top foil 1 and the diaphragm are made of high-temperature-resistant alloy materials. The bearing pedestal 3 is simple in structure, and is made of stainless steel materials in consideration of wear replacement after use. The top foil 1 is of a circular ring structure, the concave area of the lower concave flow guide part 6 on the upper surface of the top foil 1 is processed in a fine grinding mode, and the concave area of the concave part 10 on the upper surface is prepared in a machining mode. The diaphragm is prepared in a linear cutting mode and is a circular ring-shaped diaphragm. The bearing seat 3 is prepared by adopting a machining mode, and the excircle size is larger than that of the top foil 1 and the diaphragm.
Top foil 1, diaphragm and bearing frame 3 in this application all adopt whole week formula structure to can improve the overall structure uniformity of top foil 1, diaphragm and bearing frame 3.
The top foil 1 and the middle supporting unit 2 are clamped and fixed, and the fixed connection can be realized by directly utilizing the structures of the top foil 1 and the middle supporting unit 2 without adding additional connecting structures such as pins or screws, so that the process can be simplified, and the production cost can be reduced.
The middle supporting unit 2 is of an annular structure, first clamping blocks 14 are arranged on the outer peripheral side and/or the inner peripheral side of the middle supporting unit 2 at intervals along the circumferential direction, first clamping grooves 15 are arranged on the outer peripheral side and/or the inner peripheral side of the top foil 1, and the first clamping blocks 14 are bent towards the first clamping grooves 15 and clamped into the first clamping grooves 15.
In one embodiment, the outer periphery side and the inner periphery side of the middle supporting unit 2 are provided with the first clamping blocks 14 at intervals along the circumferential direction, the outer periphery side and the inner periphery side of the top foil 1 are provided with the first clamping grooves 15, and the first clamping blocks 14 are bent towards the first clamping grooves 15 and clamped in the first clamping grooves 15, so that the middle supporting unit 2 and the top foil 1 are clamped and fixed at the inner periphery side and the outer periphery side, and the stability of the connecting structure of the middle supporting unit 2 and the top foil 1 is effectively improved.
The first clamping groove 15 is arranged on the outer peripheral surface corresponding to the protruding portion 11, the first clamping block 14 is arranged at the corresponding position of the middle supporting unit 2, the surface contact is formed between the protruding portion 11 and the middle supporting unit 2, and the supporting structure between the protruding portion 11 and the middle supporting unit 2 is stable, so that the first clamping groove 15 is arranged on the outer peripheral surface corresponding to the protruding portion 11, the first clamping block 14 is arranged at the corresponding matching position of the middle supporting unit 2, after the first clamping block 14 is bent and clamped into the first clamping groove 15, a good and stable clamping structure can be formed by the surface contact between the protruding portion 11 and the middle supporting unit 2, the clamping between the top foil 1 and the middle supporting unit 2 is not easily affected by the elastic deformation of the top foil 1, and the stability of the connecting structure between the top foil 1 and the middle supporting unit 2 is ensured.
When the top foil 1 is assembled on the middle supporting unit 2, the first clamping block 14 on the outer circumference of the middle supporting unit 2 can be bent upwards, so that the first clamping block 14 is clamped into the first clamping groove 15 to form a dovetail tenon structure, and the relative displacement of the top foil 1 and the middle supporting unit 2 in the axial direction and the circumferential direction is effectively fixed.
In one embodiment, the intermediate support unit 2 is snap-fitted to the bearing housing 3.
When the supporting surface 12 is provided with the protruding block 13, the middle supporting unit 2 is of an annular structure, second clamping blocks 16 are arranged on the outer periphery side and/or the inner periphery side of the middle supporting unit 2 at intervals along the circumferential direction, second clamping grooves 17 are arranged on the radial inner side and/or the radial outer side of the protruding block 13, and the second clamping blocks 16 are bent towards the second clamping grooves 17 and clamped into the second clamping grooves 17.
In one embodiment, the outer periphery side and the inner periphery side of the middle supporting unit 2 are provided with the second clamping blocks 16 at intervals along the circumferential direction, the radial inner side and the radial outer side of the protruding block 13 are provided with the second clamping grooves 17, the second clamping blocks 16 are bent towards the second clamping grooves 17 and clamped into the second clamping grooves 17, so that the middle supporting unit 2 and the bearing seat 3 are clamped and fixed at the inner periphery side and the outer periphery side, and the stability of the connecting structure of the middle supporting unit 2 and the bearing seat 3 is effectively improved.
Because the bump 13 is arranged corresponding to the recessed portion 10, the second clamping groove 17 is arranged on the bump 13, the second clamping groove 17 is arranged corresponding to the recessed portion 10 along the circumferential direction, the first clamping groove 15 is arranged corresponding to the protruding portion 11 along the circumferential direction, the first clamping block 14 is arranged corresponding to the first clamping groove 15, the second clamping block 16 is arranged corresponding to the second clamping groove 17, the recessed portion 10 and the protruding portion 11 are alternately arranged along the circumferential direction, and therefore the first clamping block 14 and the second clamping block 16 are also alternately arranged along the circumferential direction at the periphery of the middle supporting unit 2, and interference of the structures of the first clamping block 14 and the second clamping block 16 is effectively avoided, so that the structures of the first clamping block 14 and the second clamping block 16 are more reasonably distributed, the space at the outer peripheral side of the middle supporting unit 2 is fully utilized, and the stability and reliability of the whole structure of the gas dynamic pressure bearing are improved.
The width of the second clamping block 16 increases progressively along the radial direction of the outer peripheral surface far away from the middle supporting unit 2, the width of the second clamping groove 17 increases progressively along the direction far away from the middle supporting unit 2, and after the second clamping block 16 is clamped into the second clamping groove 17, the second clamping groove 17 cannot be separated from the second clamping groove 17, so that the bearing seat 3 and the middle supporting unit 2 are axially limited well, and the stability of the relative positions of the bearing seat 3 and the middle supporting unit 2 is ensured. In addition, because second fixture block 16 blocks into in the second draw-in groove 17, consequently effectively injectd the circumference relative position between bearing frame 3 and the middle support unit 2 simultaneously to can utilize the joint cooperation of second fixture block 16 and second draw-in groove 17, fixed middle support unit 2's circumference and axial displacement simultaneously, make the mounting means of bearing simpler, assembly efficiency is higher.
When the intermediate support unit 2 is assembled on the bearing seat 3, the second clamping block 16 on the outer circumference of the intermediate support unit 2 can be bent downwards, so that the second clamping block 16 is clamped into the second clamping groove 17 to form a dovetail structure, and the axial and circumferential relative displacements of the bearing seat 3 and the intermediate support unit 2 are effectively fixed.
In other embodiments, the intermediate support unit 2 may be a foil arch.
According to an embodiment of the present application, the motor includes a gas dynamic bearing, which is the above-described gas dynamic bearing.
According to an embodiment of the present application, the compressor includes a gas dynamic bearing, which is the above-described gas dynamic bearing.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (21)
1. The utility model provides a gaseous dynamic pressure bearing, its characterized in that, includes top foil (1), middle supporting element (2) and bearing frame (3), middle supporting element (2) fixed mounting be in on bearing frame (3), top foil (1) fixed mounting be in on the middle supporting element (2), top foil (1) is integral annular structure, top foil (1) has and keeps away from bearing surface (4) of middle supporting element (2), bearing surface (4) are including following plane portion (5) and the lower concave water conservancy diversion portion (6) of arranging in turn of top foil (1) circumference, plane portion (5) and lower concave water conservancy diversion portion (6) connect gradually end to end, lower concave water conservancy diversion portion (6) are configured as with the air current water conservancy diversion extremely plane portion (5).
2. A gas dynamic pressure bearing according to claim 1, characterized in that the planar portion (5) is perpendicular to the central axis of the top foil (1).
3. Aerodynamic bearing according to claim 1, characterized in that the lower concave flow guide (6) comprises a flow guiding section (7) and a flow guiding section (8), the length of the flow guiding section (7) being greater than the length of the flow guiding section (8), the flow guiding section (7) being located on the front side of the flow guiding section (8) in the flow direction of the gas.
4. Aerodynamic bearing according to claim 3, characterized in that the flow guiding section (7) is an inclined plane and the flow guiding section (8) is an arc surface.
5. Aerodynamic bearing according to claim 1, characterized in that the circumferential widths of the planar portion (5) and the lower concave flow guide portion (6) are the same; or the circumferential widths of the plane part (5) and the lower concave flow guide part (6) are different.
6. A gas dynamic pressure bearing according to claim 1, characterized in that the top foil (1) has a mating surface (9) facing the intermediate support unit (2), the mating surface (9) comprising a recess (10) and a projection (11), the recess (10) being recessed in a direction away from the intermediate support unit (2), the projection (11) being projected towards the intermediate support unit (2), the recess (10) being provided in correspondence with the planar portion (5), the projection (11) being provided in correspondence with the lower concave flow guide portion (6).
7. A gas dynamic pressure bearing according to claim 6, characterized in that the tops of the projections (11) are flat surfaces, the top flat surfaces of the projections (11) forming a surface fit with the intermediate support unit (2).
8. A gas dynamic pressure bearing according to claim 6, characterized in that the recess (10) extends in the radial direction of the top foil (1) and through the top foil (1).
9. A gas dynamic pressure bearing according to claim 6, characterized in that the intermediate support unit (2) comprises an annular flat plate, the projection (11) being supported on a plate surface of the flat plate.
10. A gas dynamic pressure bearing according to claim 9, characterized in that the bearing housing (3) is supported on the side of the flat plate remote from the top foil (1), the bearing housing (3) comprising a support surface (12), a projection (13) being provided on the support surface (12), the projection (13) being provided in correspondence with the recess (10) and being receivable in the recess (10).
11. A gas dynamic pressure bearing according to claim 10, characterized in that the projection pattern of the projections (13) and the recesses (10) on the support surface (12) is a similar pattern, and the projection of the projections (13) falls entirely within the projection range of the recesses (10).
12. A gas dynamic bearing according to any one of claims 6 to 11, characterized in that the top foil (1) and the intermediate support unit (2) are snap-fitted to each other.
13. The gas dynamic pressure bearing according to claim 12, wherein the intermediate support unit (2) has an annular structure, first locking blocks (14) are arranged on the outer circumferential side and/or the inner circumferential side of the intermediate support unit (2) at intervals along the circumferential direction, first locking grooves (15) are arranged on the outer circumferential side and/or the inner circumferential side of the top foil (1), and the first locking blocks (14) are bent towards the first locking grooves (15) and are locked in the first locking grooves (15).
14. The gas dynamic pressure bearing according to claim 13, wherein the first catching groove (15) is provided on an outer circumferential surface corresponding to the projection (11), and the first catching block (14) is provided at a corresponding position of the intermediate support unit (2).
15. The gas dynamic pressure bearing according to claim 13, wherein the first engaging piece (14) has a width that increases in a radial direction away from the outer peripheral surface of the intermediate support unit (2), and the first engaging groove (15) has a width that increases in a direction away from the mating surface (9).
16. A gas dynamic pressure bearing according to any one of claims 1 to 11, 13 to 15, characterized in that the intermediate support unit (2) and the bearing housing (3) are snap-fitted.
17. The aerodynamic bearing according to claim 16, wherein when the supporting surface (12) is provided with the protrusions (13), the intermediate supporting unit (2) has an annular structure, the outer and/or inner peripheral side of the intermediate supporting unit (2) is provided with second locking blocks (16) at intervals along the circumferential direction, the radially inner and/or outer side of the protrusions (13) is provided with second locking grooves (17), and the second locking blocks (16) are bent toward the second locking grooves (17) and are locked into the second locking grooves (17).
18. The gas dynamic pressure bearing according to claim 17, wherein the second cartridge (16) has a width that increases in a radial direction away from the outer circumferential surface of the intermediate support unit (2), and the second catching groove (17) has a width that increases in a direction away from the intermediate support unit (2).
19. Aerodynamic bearing according to claim 1, characterized in that the intermediate support element (2) is a foil arch.
20. An electrical machine comprising a gas dynamic bearing, wherein the gas dynamic bearing is as claimed in any one of claims 1 to 19.
21. A compressor comprising a gas dynamic bearing, characterized in that the gas dynamic bearing is as claimed in any one of claims 1 to 19.
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| CN202010869800.2A CN112160980B (en) | 2020-08-26 | 2020-08-26 | Gas dynamic pressure bearing, motor and compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010869800.2A CN112160980B (en) | 2020-08-26 | 2020-08-26 | Gas dynamic pressure bearing, motor and compressor |
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| CN112160980A true CN112160980A (en) | 2021-01-01 |
| CN112160980B CN112160980B (en) | 2021-10-08 |
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Cited By (1)
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| WO2022160680A1 (en) * | 2021-01-29 | 2022-08-04 | 青岛海尔智能技术研发有限公司 | Dynamic pressure thrust bearing |
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| CN112160980B (en) | 2021-10-08 |
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