A bottom plate universal aerodynamic pressure bearing

Abstract

The application relates to the technical field of air bearing, in particular to a bottom plate universal air dynamic pressure bearing. The bottom plate universal air dynamic pressure bearing comprises a bottom plate, a plurality of supporting wave foils and a top foil, the bottom plate is provided with a boss protruding towards the supporting wave foil at the position corresponding to each supporting wave foil, the boss is integrally formed with the bottom plate by pressure stamping, 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 shape of the boss, the supporting wave foil is fixedly connected with the boss through the clamping hole, and the clamping hole and the boss are pre-tightening assembled; the bottom plate on the left and right sides of the boss is respectively provided with a cooling groove. The process is simplified, the assembly efficiency is improved, the spot welding process between the supporting wave foil and the bottom plate is cancelled, the bosses are uniformly arranged on the bottom plate along the circumference, the bottom plate on the left and right sides of the boss is provided with the cooling groove, the bottom plate can be universal in the two structural forms of left rotation and right rotation, one set of mold is saved, and the machining cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air bearing, in particular to a bottom plate universal air dynamic pressure bearing. 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 speed, low friction power consumption, high and low temperature resistance, good stability and convenient maintenance, and has broad application prospects in the field of high-speed rotating machinery. At present, the air bearing has been widely used in the field of hydrogen fuel cell centrifugal air compressor.

[0003] The dynamic pressure air thrust bearing uses the compression effect of the wedge-shaped air film between the top foil and the thrust disc to generate axial bearing force. For example, a patent application with the title of "Thrust foil dynamic pressure air bearing with thick top foil structure" with the publication number CN108286567A mainly includes a bottom plate, a gasket, a support wave foil and a top foil. First, the gasket is a separate component. The gasket is connected to 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. Any slight mistake can easily cause warping deformation, affecting the flatness of the entire bottom plate and top foil, even forming a defective product that cannot 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. Second, the support wave foil is connected to the bottom plate through spot welding. Multiple welding can easily cause unstable size tolerance, which greatly reduces the product qualification rate. In addition, the current air dynamic pressure bearing includes left-handed and right-handed structure forms. The main difference between the two is the installation direction of the support wave foil. However, the current bottom plate cannot be used in both structure forms, and two sets of molds need to be set up for processing, which increases the processing cost.

[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 a bottom plate universal air dynamic pressure bearing, which solves the problem that the gasket needs to be connected to the bottom plate and the top foil through two spot welding processes, solves the problem that the support wave foil needs to be connected to the bottom plate through a spot welding process, and solves the problem that the bottom plate cannot be universal.

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

[0007] The utility model provides a bottom plate general type aerodynamic pressure bearing, including bottom plate, a plurality of support wave foil and top foil, the position of bottom plate corresponds to each support wave foil is equipped with the boss that protrudes to support wave foil direction, the boss is integrally pressure forming and is made, the boss is fixedly connected with top foil, one side of support wave foil is equipped with the carding hole that cooperates with the boss shape, support wave foil is fixedly connected with the boss through carding hole, and it is pre -tight assembly between carding hole and the boss, the bottom plate is equipped with cooling groove respectively on the left and right sides of the boss.

[0008] The periphery of the boss is integrally connected with the bottom plate.

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

[0010] The support wave foil and the top foil are pre-tight assembly.

[0011] The top foil includes a plurality of single foil pieces, and the plurality of single foil pieces are arranged in a ring shape.

[0012] The outer periphery of the bottom plate is provided with a plurality of mounting holes.

[0013] The outer surface of the top foil is sprayed with a wear-resistant coating.

[0014] The wear-resistant coating includes a molybdenum disulfide coating or a polytetrafluoroethylene coating.

[0015] The top foil is provided with a pre-pressing inclined surface.

[0016] The above scheme has the following advantages:

[0017] (1) The boss protruding towards the support wave foil is integrally pressure formed at the position corresponding to each support wave foil on the bottom plate, which simplifies the process, improves the assembly efficiency, cancels a spot welding process, avoids the problem of warping deformation affecting flatness caused by excessive spot welding times, improves the finished product qualification rate, reduces the welding points on the contact surface between the top foil and the thrust disc, and improves the flatness and smoothness of the top foil.

[0018] (2) The carding hole matched with the shape of the boss is formed on one side of the support wave foil, the support wave foil is fixedly connected with the boss through the carding hole, 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 product qualification rate is greatly improved, and the processing cost is reduced.

[0019] (3) The bosses are uniformly arranged along the circumference on the bottom plate, and the bottom plate on the left and right sides of the bosses is provided with cooling grooves, so that the bottom plate can be used in two structure forms of left rotation and right rotation, a set of molds is saved, and the processing cost is reduced. BRIEF DESCRIPTION OF DRAWINGS:

[0020] Figure 1 It is a structural schematic diagram of the present application.

[0021] Figure 2 It is a structural schematic diagram of the present application.

[0022] Figure 3 It is a structural schematic diagram of the present application.

[0023] Figure 4 It is a structural schematic diagram of the present application.

[0024] Figure 5 It is a structural schematic diagram of the present application.

[0025] In the figure, 1, base plate, 2, support wave foil, 3, top foil, 4, boss, 5, cooling groove, 6, mounting hole, 7, clamping hole. DETAILED DESCRIPTION

[0026] 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.

[0027] As shown in Figures 1-5 A base plate general type aerodynamic pressure bearing, comprising a base plate 1, a plurality of support wave foils 2 and a top foil 3, the base plate 1 is provided with a boss 4 protruding in the direction of the support wave foil 2 at the position corresponding to each support wave foil 2, the boss 4 is integrally stamped with the base plate 1, simplifying the process, improving the assembly efficiency, canceling a spot welding process, avoiding the problem of excessive spot welding times leading to warping deformation affecting flatness, improving the finished product qualification rate, the boss 4 and the support wave foil 2 are in pairs to support the top foil 3, the boss 4 is fixedly connected with the top foil 3; the flat plate on one side of the support wave foil 2 is designed to be lengthened, then a clamping hole 7 matched with the shape of the boss 4 is formed on the flat plate, the support wave foil 2 is fixedly connected with the boss 4 through the clamping hole 7, the clamping hole 7 and the boss 4 are pre-tightening assembly, the support wave foil 2 can be firmly installed, preventing the support wave foil 2 from moving, the disassembly and assembly are quick and convenient, the spot welding process between the support wave foil 2 and the base plate 1 is canceled, avoiding the unstable dimensional tolerance caused by multiple welding, so that the product qualification rate is greatly improved; the bosses 4 are uniformly arranged on the base plate 1 along the circumference, the base plate on the left and right sides of the boss 4 is respectively provided with a cooling groove 5, so that the base plate 1 can be used in both left-handed and right-handed structural forms, saving a set of molds and reducing the processing cost.

[0028] The boss 4 is integrally connected with the base plate 1 around, which has high strength and is not easy to deform.

[0029] The boss 4 is fixedly connected with the top foil 3 by spot welding, laser welding or ultrasonic welding.

[0030] The support wave foil 2 and the top foil 3 are pre-tightening assembled.

[0031] The top foil 3 comprises a plurality of single foils arranged in a ring shape.

[0032] The bottom plate 1 is provided with a plurality of mounting holes 6.

[0033] The outer surface of the top foil 3 is sprayed with a wear-resistant coating, and the wear-resistant coating comprises a molybdenum disulfide coating or a polytetrafluoroethylene coating, which can reduce wear and improve service life.

[0034] The top foil is provided with a pre-pressing inclined surface.

[0035] In the assembly, the boss 4 protruding towards the support wave foil 2 is integrally formed on the bottom plate 1 at the position corresponding to each support wave foil 2, then the support wave foil 2 is fixedly connected with the boss 4 through the clamping hole 7, the clamping hole 7 and the boss 4 are pre-tightening assembled, the support wave foil 2 can be firmly installed, and the movement of the support wave foil 2 is prevented, then each single foil 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 are fixedly connected by spot welding, 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 effect on the thrust disc.

[0036] 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.

[0037] The details not described in the present application are the known technology of the person skilled in the art.

Claims

1. A universal air dynamic bearing with a base plate, comprising a base plate, a plurality of supporting corrugated foils, and a top layer foil, characterized in that: The base plate has a protrusion protruding towards the support foil at the position of each support foil. The protrusion is integrally formed with the base plate by pressing. The protrusion is fixedly connected to the top foil. One side of the support foil has a mounting hole that matches the shape of the protrusion. The support foil is fixedly connected to the protrusion through the mounting hole. The mounting hole and the protrusion are pre-tightly assembled. Cooling grooves are respectively provided on the base plate on the left and right sides of the protrusion. During assembly, firstly, a boss protruding towards the support foil is integrally pressed and formed on the base plate corresponding to the position of each support foil. Then, the support foil is fixedly connected to the boss through the mounting hole to securely install the support foil and prevent it from moving. Next, each single foil of the top layer is placed corresponding to a set of support foils and bosses. Finally, the bosses and single foils are fixedly connected by spot welding.

2. The universal air dynamic bearing for base plates according to claim 1, characterized in that: The boss is integrally connected to the base plate on all four sides.

3. The universal air dynamic bearing for base plates according to claim 1, characterized in that: The boss is fixedly connected to the top foil by spot welding, laser welding or ultrasonic welding.

4. The universal air dynamic bearing for base plates according to claim 1, characterized in that: The supporting foil and the top foil are pre-tightly assembled.

5. A universal air dynamic bearing for base plates according to claim 1, characterized in that: The top layer foil comprises several individual foil sheets arranged in a ring.

6. A universal air dynamic bearing for base plates according to claim 1, characterized in that: The base plate has several mounting holes on its outer periphery.

7. A universal air dynamic bearing for base plates according to claim 1, characterized in that: The outer surface of the top foil is coated with a wear-resistant coating.

8. A universal air dynamic bearing for base plates according to claim 7, characterized in that: The wear-resistant coating includes a molybdenum disulfide coating or a polytetrafluoroethylene coating.

9. A universal air dynamic bearing for base plates according to claim 1, characterized in that: The top foil has a pre-pressed slope.

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