A welding-free air dynamic thrust bearing

Abstract

A welding-free air dynamic thrust bearing, wherein the bottom structure comprises a bottom outer ring, a plurality of bottom support sheets are arranged along the circumference of the inner side of the bottom outer ring, and an elastic foil is arranged in the space between two adjacent bottom support sheets; the intermediate support structure comprises an intermediate outer ring, an intermediate support foil is arranged on the inner side of the intermediate outer ring corresponding to the position of each bottom support sheet; the top foil structure comprises a top outer ring, a top support sheet is arranged on the inner side of the top outer ring corresponding to the position of each intermediate support foil; the bottom structure, the intermediate support structure, and the top foil structure are fixedly connected by a connector. The three are fixedly connected by rivets or screws, which replaces the previous spot welding process, does not cause damage to the components, has a simple assembly process, greatly improves processing efficiency, can meet market demand, avoids the situation where the intermediate support and the top foil are warped and deformed due to the high temperature of the welding point during welding, and forms defective products, and saves processing materials.

Description

Technical field:

[0001] The invention relates to a welding-free air dynamic pressure thrust bearing. Background technology:

[0002] Air bearings are self-acting dynamic pressure air bearings that use air as a lubricating medium. Compared with traditional high-speed bearings, air bearings have the advantages of simple structure, high speed, low friction power consumption, high and low temperature resistance, good stability and easy maintenance. They have broad application prospects in the field of high-speed rotating machinery. At present, air bearings have been widely used in the field of centrifugal air compressors for hydrogen fuel cells.

[0003] The air thrust bearing utilizes the compression effect of the wedge-shaped air film between the top foil and the thrust plate to generate axial bearing force. It mainly includes three parts: a base plate, an intermediate support, and a top foil. Among them, the base plate is generally an integral structure, and the intermediate support and the top foil are generally split structures. The connection between the intermediate support, the top foil and the base plate is connected by spot welding. Its disadvantages are: 1. The welding process requirements are very high and relatively complicated. There are too many welding points, which can easily cause damage to various components, and the processing efficiency is low, making it difficult to meet market demand; 2. The welding point temperature is very high during welding, and high temperature can easily cause the intermediate support and the top foil to warp and deform, resulting in defective products and waste of processing materials; 3. When the bearing works for a long time, the welding points are easy to fall off, causing the top foil to move or warp along the axial direction, thereby contacting the thrust plate, causing wear of the free end of the top foil and the thrust plate, a short service life, and difficulty in maintenance.

[0004] In summary, the connection problem among the bottom plate, the middle support and the top foil of the air thrust bearing has become a technical problem that needs to be solved urgently in the industry. Summary of the invention:

[0005] In order to make up for the deficiencies of the prior art, the present invention provides a welding-free pneumatic thrust bearing, which solves the problem of high welding process requirements and low processing efficiency in the past, solves the problem of high welding point temperature during welding causing warping and deformation of the intermediate support and the top foil to form defective products, and solves the problem of easy falling off of the welding points in the past.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A welding-free air dynamic thrust bearing, comprising:

[0008] A bottom structure, the bottom structure comprising a bottom outer ring, a plurality of bottom support sheets are arranged along the circumference of the inner side of the bottom outer ring, an elastic foil is arranged in the space between two adjacent bottom support sheets, one end of the elastic foil is integrally connected to one of the bottom support sheets, and the other end is a free end, and a plurality of bottom mounting holes are arranged on the outer edge of the bottom outer ring;

[0009] An intermediate support structure, the intermediate support structure comprising an intermediate outer ring, an intermediate support foil is arranged on the inner side of the intermediate outer ring corresponding to the position of each bottom support sheet, and an intermediate mounting hole is arranged on the outer edge of the intermediate outer ring corresponding to the position of each bottom mounting hole;

[0010] A top foil structure, the top foil structure comprising a top outer ring, a top support sheet is arranged on the inner side of the top outer ring corresponding to the position of each intermediate support foil, a top foil is arranged in the space between two adjacent top support sheets corresponding to the positions of the intermediate support foil and the elastic foil, one end of the top foil is fixedly connected to one of the top support sheets, and the other end is a free end or fixedly connected to the other top support sheet, and a top mounting hole is arranged on the outer edge of the top outer ring corresponding to the position of each intermediate mounting hole;

[0011] The bottom structure, the middle supporting structure and the top foil structure are fixedly connected at the bottom mounting hole, the middle mounting hole and the top mounting hole through connecting pieces.

[0012] The connecting piece includes a rivet, a screw or a pin.

[0013] The bottom layer structure, the middle support structure and the top layer foil structure are all formed by integral stamping.

[0014] The top foil includes an inclined foil corresponding to the position of the middle supporting foil and a horizontal foil corresponding to the position of the elastic foil.

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

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

[0017] A bottom arc-shaped notch is provided between the elastic foil and the bottom outer ring, and a top arc-shaped notch corresponding to the position of the bottom arc-shaped notch is provided between the top foil and the top outer ring.

[0018] The present invention adopts the above scheme and has the following advantages:

[0019] The bottom structure, the middle support structure and the top foil structure are all designed as an integral structure, and the three are fixedly connected by rivets, screws or pins, replacing the previous spot welding process, without causing damage to the components. The assembly process is simple, the processing efficiency is greatly improved, and it can meet market demand, avoid the situation where the welding point temperature is very high during welding, which causes the middle support and the top foil to warp and deform, forming defective products, and saves processing materials. The rivet, screw or pin connection structure is stable and not easy to fall off, avoiding the top foil from moving or warping in the axial direction and contacting and wearing with the thrust plate. It has a long service life and is easy to repair even if the rivet, screw or pin is loose. Description of the drawings:

[0020] Figure 1 It is a schematic diagram of the explosion structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the underlying structure of the present invention.

[0022] Figure 3 It is a schematic diagram of the intermediate support structure of the present invention.

[0023] Figure 4 Schematic diagram of the top foil structure of the present invention.

[0024] In the figure, 1, bottom structure, 2, bottom outer ring, 3, bottom support sheet, 4, elastic foil, 5, bottom mounting hole, 6, middle support structure, 7, middle outer ring, 8, middle support foil, 9, middle mounting hole, 10, top foil structure, 11, top outer ring, 12, top support sheet, 13, top foil, 14, top mounting hole, 15, bottom arc notch, 16, top arc notch. Specific implementation method:

[0025] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0026] like Figure 1-4 As shown, a welding-free air dynamic thrust bearing comprises:

[0027] A bottom structure 1, the bottom structure 1 comprises a bottom outer ring 2, a plurality of bottom support sheets 3 are arranged along the circumference of the inner side of the bottom outer ring 2, an elastic foil sheet 4 is arranged in the space between two adjacent bottom support sheets 3, one end of the elastic foil sheet 4 is integrally connected to one of the bottom support sheets 3, and the other end is a free end, and a plurality of bottom mounting holes 5 are arranged on the outer edge of the bottom outer ring 2;

[0028] An intermediate support structure 6, the intermediate support structure 6 comprises an intermediate outer ring 7, an intermediate support foil 8 is arranged on the inner side of the intermediate outer ring 7 corresponding to the position of each bottom support sheet 3, and an intermediate mounting hole 9 is arranged on the outer edge of the intermediate outer ring 7 corresponding to the position of each bottom mounting hole;

[0029] A top foil structure 10, the top foil structure 10 comprises a top outer ring 11, a top support sheet 12 is provided on the inner side of the top outer ring 11 at a position corresponding to each intermediate support foil 8, a top foil 13 is provided in a space between two adjacent top support sheets 12 at a position corresponding to the intermediate support foil 8 and the elastic foil 4, one end of the top foil 13 is fixedly connected to one of the top support sheets 12, and the other end is a free end or fixedly connected to the other top support sheet, and a top mounting hole 14 is provided on the outer edge of the top outer ring 11 at a position corresponding to each intermediate mounting hole 9;

[0030] The bottom outer ring 2, the middle outer ring 7 and the top outer ring 11 are of the same size. The bottom structure 1, the middle support structure 6 and the top foil structure 10 are fixedly connected at the bottom mounting hole 5, the middle mounting hole 9 and the top mounting hole 14 by connectors.

[0031] The connecting member includes a rivet, a screw or a pin. Other conventional structural forms that can achieve fixed connection in the art are within the protection scope of the present invention.

[0032] The bottom layer structure 1, the middle support structure 6 and the top layer foil structure 10 are all formed by integral stamping.

[0033] The top foil 13 includes an inclined foil corresponding to the position of the middle supporting foil 9 and a horizontal foil corresponding to the position of the elastic foil 4 .

[0034] The outer surface of the top foil structure 10 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 increase service life.

[0035] A bottom arc-shaped notch 15 is provided between the elastic foil 4 and the bottom outer ring 2 , and a top arc-shaped notch 16 corresponding to the position of the bottom arc-shaped notch 15 is provided between the top foil 13 and the top outer ring 11 , which facilitates air to enter the bearing.

[0036] When assembling the present invention, the bottom structure 1, the middle support structure 6, and the top foil structure 10 are stacked together, the bottom outer ring 2, the middle outer ring 7, and the top outer ring 11 are in corresponding positions, the bottom support sheet 3, the middle support foil 9, and the top support sheet 12 are in corresponding positions, the middle support foil 9 and the inclined foil 15 are in corresponding positions, the elastic foil 4 and the horizontal foil 16 are in corresponding positions, the bottom mounting hole 5, the middle mounting hole 9, and the top mounting hole 14 are in corresponding positions, and the bottom structure 1, the middle support structure 6, and the top foil structure 10 are assembled by rivets, screws, or pins passing through the bottom mounting hole 5, the middle mounting hole 9, and the top mounting hole 14. The support structure 6 and the top foil structure 10 are fixedly connected, replacing the previous spot welding process, which will not cause damage to the components. The assembly process is simple, the processing efficiency is greatly improved, and the market demand can be met. The high temperature of the welding spot during welding causes the intermediate support structure 6 and the top foil structure 10 to warp and deform, forming defective products, saving processing materials. The rivet, screw or pin connection structure is stable and not easy to fall off, which avoids the top foil from moving or warping along the axial direction and contacting and wearing the thrust plate. It has a long service life and is easy to repair even if the rivet, screw or pin is loose. When the air bearing is working, the elastic foil will undergo a slight elastic deformation under the action of the air film, and will slide slightly with the inner surface of the top foil, providing sufficient damping for the high-speed operation of the bearing, and the generated air film will play a thrust role on the thrust plate.

[0037] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any substitution, improvement or change made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0038] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A welding-free air dynamic thrust bearing, characterized in that: include: A bottom structure, the bottom structure comprising a bottom outer ring, a plurality of bottom support sheets are arranged along the circumference of the inner side of the bottom outer ring, an elastic foil is arranged in the space between two adjacent bottom support sheets, one end of the elastic foil is integrally connected to one of the bottom support sheets, and the other end is a free end, and a plurality of bottom mounting holes are arranged on the outer edge of the bottom outer ring; An intermediate support structure, the intermediate support structure comprising an intermediate outer ring, an intermediate support foil is arranged on the inner side of the intermediate outer ring corresponding to the position of each bottom support sheet, and an intermediate mounting hole is arranged on the outer edge of the intermediate outer ring corresponding to the position of each bottom mounting hole; A top foil structure, the top foil structure comprising a top outer ring, a top support sheet is arranged on the inner side of the top outer ring corresponding to the position of each intermediate support foil, a top foil is arranged in the space between two adjacent top support sheets corresponding to the positions of the intermediate support foil and the elastic foil, one end of the top foil is fixedly connected to one of the top support sheets, and the other end is a free end or fixedly connected to the other top support sheet, and a top mounting hole is arranged on the outer edge of the top outer ring corresponding to the position of each intermediate mounting hole; The bottom structure, the middle support structure, and the top foil structure are fixedly connected at the bottom mounting hole, the middle mounting hole, and the top mounting hole by connecting pieces; The bottom layer structure, the middle support structure and the top layer foil structure are all formed by integral stamping; The top foil includes an inclined foil corresponding to the position of the middle supporting foil and a horizontal foil corresponding to the position of the elastic foil; A bottom arc-shaped notch is provided between the elastic foil and the bottom outer ring, and a top arc-shaped notch corresponding to the position of the bottom arc-shaped notch is provided between the top foil and the top outer ring.

2. The welding-free air dynamic thrust bearing according to claim 1, characterized in that: The connecting piece includes a rivet, a screw or a pin.

3. The welding-free air dynamic thrust bearing according to claim 1, characterized in that: The outer surface of the top foil structure is sprayed with a wear-resistant coating.

4. The welding-free air dynamic thrust bearing according to claim 3, characterized in that: The wear-resistant coating includes a molybdenum disulfide coating or a polytetrafluoroethylene coating.

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