An air bearing based on a base plate embossed boss

Abstract

The application relates to the technical field of air bearings, in particular to an air bearing based on a bottom plate embossed boss. The air bearing comprises a bottom plate, a plurality of supporting wave foils and a top foil, the bottom plate is provided with bosses protruding towards the supporting wave foils at positions corresponding to the supporting wave foils, the bosses are integrally embossed and formed with the bottom plate, and the bosses are fixedly connected with the top foil; one side of the supporting wave foil is provided with a clamping hole matched with the shape of the boss, the supporting wave foil is fixedly connected with the boss through the clamping hole, and the pre-tightening assembly is arranged between the positioning clamping boss and the positioning clamping groove. The spot welding process between the supporting wave foil and the bottom plate is cancelled, the unstable size tolerance caused by multiple weldings is avoided, the qualified rate of the product is greatly improved, the processing cost is reduced, the problem that warping deformation caused by too many spot weldings affects the flatness is avoided, the qualified rate of the finished product is improved, the welding spots on the contact surface between the top foil and the thrust disc are reduced, and the flatness and smoothness of the top foil are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air bearing, and particularly relates to an air bearing based on a bottom plate stamping boss. BACKGROUND

[0002] The air bearing is a self-acting dynamic pressure air bearing using air as a lubricating medium. Compared with the traditional high-speed bearing, the air bearing has the advantages of simple structure, high rotating speed, low friction power consumption, high and low temperature resistance, good stability and convenient maintenance, and has a wide application prospect in the field of high-speed rotating machinery. At present, the air bearing has been widely applied in the field of centrifugal air compressors for hydrogen fuel cells.

[0003] The dynamic pressure air thrust bearing generates axial bearing force by using the compression effect of the wedge-shaped air film between the top foil and the thrust disc. The patent application with the publication number CN108286567A and the name of a thrust foil dynamic pressure air bearing with a thick top foil structure mainly comprises a bottom plate, a gasket, a support wave foil and a top foil. First, the gasket is a separately added component. The gasket is connected with the bottom plate and the top foil through spot welding. The disadvantage is that two spot welding processes are required at the gasket, which not only reduces the assembly efficiency, but also has high and complex process requirements. The positioning and welding of each gasket have strict requirements, and the processing precision is high. If there is any mistake, the warping deformation will affect the flatness of the entire bottom plate and the top foil, even forming a defective product and being unable to be used, wasting materials and increasing costs. A plurality of welding points are arranged on the contact surface of the top foil and the thrust disc, which reduces the flatness and smoothness of the top foil. Secondly, the support wave foil is connected with the bottom plate through spot welding. Multiple welding processes can easily cause unstable size tolerance, which greatly reduces the product qualification rate. In addition, the top foil in the patent with the publication number CN108286567A is a split structure. One side of each top foil is fixed, and the other side is a free end. The disadvantage is that the free end is easy to move or warp along the axial direction, so as to contact the thrust disc, which causes the free end of the top foil and the thrust disc to wear, and seriously reduces the stability and service life of the bearing.

[0004] In summary, the above-mentioned problems in the dynamic pressure air thrust bearing have become a technical problem that needs to be solved in the industry. SUMMARY

[0005] In order to make up for the shortcomings of the prior art, the present application provides an air bearing based on a bottom plate stamping boss, which solves the problem that the gasket needs to be connected with the bottom plate and the top foil through two spot welding processes, and solves the problem that the support wave foil needs to be connected with the bottom plate through a spot welding process. The process is simplified, the assembly efficiency is improved, and the product qualification rate is improved.

[0006] The technical scheme adopted by the present application to solve the above technical problems is:

[0007] An air bearing based on a bottom plate embossed boss, comprising a bottom plate, a plurality of support wave foils and a top foil, the bottom plate is provided with a boss protruding in the direction of the support wave foil at the position corresponding to each support wave foil, the boss is integrally embossed and formed with the bottom plate, and the boss is fixedly connected with the top foil; one side of the support wave foil is provided with a clamping hole matched with the shape of the boss, the support wave foil is fixedly connected with the boss through the clamping hole, the left and right sides of the boss are provided with positioning clamping grooves, and the clamping hole is provided with a positioning clamping convex matched with the positioning clamping groove, and the positioning clamping convex and the positioning clamping groove are pre-tightening assembled.

[0008] The left and right sides of the boss are integrally connected with the bottom plate, and the other two sides of the boss are provided with cooling grooves.

[0009] The boss is fixedly connected with the top foil through spot welding, laser welding or ultrasonic welding.

[0010] The clamping hole and the boss outside the positioning clamping convex and the positioning clamping groove are gap matched, and the support wave foil and the top foil are pre-tightening assembled.

[0011] The top foil comprises a plurality of single foils, the plurality of single foils are arranged in a ring shape, and the adjacent two single foils are flexibly connected to form an integrated top foil structure.

[0012] The adjacent two single foils are flexibly connected through a tie, and the tie comprises a wave shape, a straight line shape or an arc shape.

[0013] The adjacent two single foils are connected through two ties, the two ties are arranged at the inner edge and the outer edge of the ring shape of the adjacent two single foils respectively, and notches are formed at the connection positions of the single foils and the ties respectively, and the notches of the adjacent two single foils are butted to form a space for accommodating the ties.

[0014] The outer periphery of the bottom plate is provided with a plurality of mounting holes.

[0015] The outer surface of the top foil is sprayed with a wear-resistant coating.

[0016] The wear-resistant coating comprises a molybdenum disulfide coating or a polytetrafluoroethylene coating.

[0017] The present application adopts the above scheme and has the following advantages:

[0018] (1) the protrusion is formed by integrally stamping on the bottom plate at the position corresponding to each support wave foil, which simplifies the process, improves the assembly efficiency, cancels a spot welding process, avoids the problem of warping deformation affecting flatness caused by too many spot welding times, improves the qualified rate of finished products, reduces the welding spots on the contact surface of the top foil and the thrust disc, and improves the flatness and smoothness of the top foil;

[0019] (2) the support wave foil is fixedly connected with the protrusion through the clamping hole matched with the shape of the protrusion, the spot welding process between the support wave foil and the bottom plate is cancelled, the dimensional tolerance instability caused by multiple welding is avoided, the qualified rate of products is greatly improved, and the processing cost is reduced;

[0020] (3) the flexible connection between the adjacent two single foils forms a whole top foil structure, when the free end of the single foil moves or warps in the axial direction, the flexible strap can pull the free end back to the original position, thereby avoiding the abrasion caused by the contact with the thrust disc, and prolonging the service life; the flexible strap not only ensures the integrity of the top foil, but also makes the top foil have a certain amount of stretching and deformation, so that the free end of the single foil can not be affected by the rising or lowering of the wave shape, and the stability of the formed air film is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the present application.

[0022] Figure 2 is an explosive structural schematic diagram of the present application.

[0023] Figure 3 is a front view structural schematic diagram of the bottom plate of the present application.

[0024] Figure 4 is a rear view structural schematic diagram of the bottom plate of the present application.

[0025] Figure 5 is a structural schematic diagram of the present application without the top foil.

[0026] In the figure, 1 is a bottom plate, 2 is a support wave foil, 3 is a top foil, 4 is a protrusion, 5 is a cooling groove, 6 is a strap, 7 is a slot, 8 is a mounting hole, 9 is a clamping hole, 10 is a positioning clamping groove, and 11 is a positioning clamping protrusion. DETAILED DESCRIPTION

[0027] In order to clearly illustrate the technical features of the present application, the present application will be described in detail below with specific embodiments and in conjunction with the accompanying drawings.

[0028] As Figures 1-5As shown, a kind of air bearing based on bottom plate embossing boss, including bottom plate 1, several support wave foil 2 and top foil 3, the position corresponding to each support wave foil 2 on the bottom plate 1 is provided with the boss 4 that protrudes to support wave foil 2 direction, the boss 4 is integrally embossed and formed into with bottom plate 1, process is simplified, improves assembly efficiency, cancels a spot welding procedure, avoids the problem that warping deformation occurs and affects flatness due to too many spot welding times, improves finished product qualification rate, boss 4 and support wave foil 2 are two two groups, to support top foil 3, the boss 4 is fixedly connected with top foil 3;The flat plate of support wave foil 2 side is designed to be lengthened, then the clamping hole 9 that is matched with the shape of boss 4 is set on the flat plate, the support wave foil 2 is fixedly connected with boss 4 by clamping hole 9, boss 4 is equipped with positioning clamping groove 10, the clamping hole 9 is equipped with the positioning clamping convex 11 matched with positioning clamping groove 10, the positioning clamping convex 11 and positioning clamping groove 10 are pre-tightening assembly, can install firm support wave foil 2, prevent support wave foil 2 from moving, disassembly is quick and convenient, cancels the spot welding procedure between support wave foil 2 and bottom plate 1, avoids the unstable dimensional tolerance caused by multiple welding, so that the qualified rate of product is greatly improved.

[0029] The left and right sides of the boss 4 are integrally connected with the bottom plate 1, have high strength and are not easy to deform, and the positioning clamping groove 10 can be provided on the left and right sides of the boss 4, and the other two sides of the boss 4 are provided with cooling grooves 5.

[0030] The boss 4 is fixedly connected with the top foil 3 by spot welding, laser welding or ultrasonic welding.

[0031] The clamping hole 9 other than the positioning clamping convex 11 and the positioning clamping groove 10 is gap-fitted with the boss 4, which is beneficial to heat dissipation of gas through the cooling grooves 5, and the support wave foil 2 and the top foil 3 are pre-tightening assembled.

[0032] The top foil 3 includes a plurality of single foils, the plurality of single foils are arranged in a ring shape, and adjacent two single foils are flexibly connected to form an integrated top foil structure.

[0033] The adjacent two single foils are flexibly connected by a tie 6, and the tie 6 includes a wave shape, a straight line shape or an arc shape. Other conventional structure forms that can realize flexible tie connection in the art are also within the protection scope of the present application. When the free end of the single foil moves or warps in the axial direction, the flexible tie 6 can pull the free end back to the original position, thereby avoiding abrasion caused by contact with the thrust disc and prolonging the service life; the flexible tie ensures the integrity of the top foil and allows the top foil to have a certain amount of stretching and deformation, so that the free end of the single foil can be raised or lowered along the wave shape without affecting the stability of the gas film.

[0034] The two adjacent single foil pieces are connected by two laces 6, which can increase the connection strength, the two laces 6 are arranged at the annular inner edge and the outer edge of the adjacent two single foil pieces, and the connection part of the single foil piece and the lace is provided with a notch 7, and the notches 7 of the adjacent two single foil pieces are connected to form a space for accommodating the lace, so that the lace 6 in the space has a certain length, thereby having a stretching and deformation space.

[0035] The outer periphery of the bottom plate 1 is provided with a plurality of mounting holes 8.

[0036] The outer surface of the top foil 3 is sprayed with a wear-resistant coating, and the wear-resistant coating includes a molybdenum disulfide coating or a polytetrafluoroethylene coating, which can reduce wear and improve service life.

[0037] In the assembly, the boss 4 protruding towards the support wave foil 2 is integrally formed on the bottom plate 1 corresponding to the position of each support wave foil 2, then the support wave foil 2 is fixedly connected with the boss 4 through the clamping hole 9, the positioning clamping 11 and the positioning clamping groove 10 are matched to play a positioning role, then each single foil piece of the top foil 3 is placed corresponding to a group of support wave foils 2 and bosses 4, finally the boss 4 and the single foil piece are fixedly connected by spot welding, and the support wave foil 2 and the top foil 3 are pre-tightening assembled. When the air bearing works, the support wave foil 2 will be elastically deformed under the action of the gas film force, and the inner surface of the top foil 3 and the surface of the bottom plate 1 will be slightly sliding, which provides sufficient damping for the high-speed operation of the bearing, and the gas film plays a thrusting role on the thrust disc.

[0038] The above specific embodiments cannot be regarded as a limitation on the protection scope of the present application, and any alternative improvement or change made by the person skilled in the art to the embodiments of the present application falls within the protection scope of the present application.

[0039] The details not described in the present application are the known technology of the person skilled in the art.

Claims

1. A bump plate based air bearing comprising a base plate, a number of support wave foils and a top layer foil, characterized in that: The bottom plate is provided with a boss protruding towards the supporting wave foil at a position corresponding to each supporting wave foil, the boss is integrally formed by coining, and the boss is fixedly connected with the top foil; one side of the supporting wave foil is provided with a clamping hole matched with the boss, the supporting wave foil is fixedly connected with the boss through the clamping hole, the boss is provided with a positioning clamping groove on the left and right sides, the clamping hole is provided with a positioning clamping convex matched with the positioning clamping groove, and the positioning clamping convex and the positioning clamping groove are pre-tightening assembled.

2. An air bearing based on a bottom plate embossed boss according to claim 1, characterized in that: The left and right sides of the boss are integrally connected with the bottom plate, and the other two sides of the boss are provided with cooling grooves.

3. An air bearing based on a bottom plate embossed boss according to claim 1, characterized in that: The boss is fixedly connected with the top foil through spot welding, laser welding or ultrasonic welding.

4. An air bearing based on a bottom plate embossed boss according to claim 1, characterized in that: The clamping hole and the boss outside the positioning clamping convex and the positioning clamping groove are gap matched, and the supporting wave foil and the top foil are pre-tightening assembled.

5. An air bearing based on a bottom plate embossed boss according to claim 1, characterized in that: The top foil comprises a plurality of single foils, the plurality of single foils are arranged in a ring shape, and adjacent two single foils are flexibly connected to form an integrated top foil structure.

6. An air bearing based on a bottom plate embossed boss according to claim 5, characterized in that: The adjacent two single foils are flexibly connected through a tie, and the tie comprises a wave shape, a straight line shape or an arc shape.

7. An air bearing based on a bottom plate embossed boss according to claim 6, characterized in that: The adjacent two single foils are connected through two ties, the two ties are arranged on the inner edge and the outer edge of the ring shape of the adjacent two single foils respectively, notches are formed at the connection positions of the single foils and the ties respectively, and the notches of the adjacent two single foils form a space for accommodating the ties after being butted.

8. An air bearing based on a bottom plate embossed boss according to claim 1, characterized in that: The outer periphery of the bottom plate is provided with a plurality of mounting holes.

9. An air bearing based on a bottom plate embossed boss according to claim 1, characterized in that: The outer surface of the top foil is sprayed with a wear-resistant coating.

10. An air bearing based on a bottom plate embossed boss according to claim 9, characterized in that: The wear-resistant coating comprises a molybdenum disulfide coating or a polytetrafluoroethylene coating.

Images