A laminated thrust gas foil bearing

Abstract

The present invention provides a laminated thrust gas foil bearing, which relates to the technical field of air dynamic pressure bearings, in order to solve the existing problems in the prior art that the existing bearing production adopts a welding process, there is a risk of the top foil of the bearing falling off due to poor welding, and the performance and quality of the product fluctuate greatly, and it is not suitable for batch production. The device includes a first laminate and at least one second laminate arranged in sequence, and the first laminate and the second laminate are both arranged as a multi-petal structure, wherein: the first laminate is arranged as an integrated structure including: a plurality of first lobes, a first connecting structure and a third connecting structure, each two adjacent first lobes are connected by the first connecting structure, and the first connecting structure is connected to the third connecting structure; the second laminate includes: a plurality of second lobes and a second connecting structure, and the plurality of second lobes are connected by the second connecting structure. The present invention is used to remove the welding process in the bearing manufacturing process and improve the quality management of the bearing.

Description

Technical Field

[0001] The invention relates to the technical field of air dynamic pressure bearings, and in particular to a laminated thrust gas foil bearing. Background Art

[0002] The thrust gas foil bearing is a kind of dynamic pressure gas bearing. Specifically, it uses the wedge effect. As the speed increases, the rotor drags the gas with a certain viscosity in the surrounding environment into the wedge for compression. When the speed rises to a certain level, the gas pressure in the wedge increases and supports the rotor. Gas foil bearings are widely used in turbomachinery such as air cycle machines, air compressors, and micro gas turbines due to their high temperature resistance, high speed, oil-free lubrication, and low friction loss.

[0003] Usually, thrust gas foil bearings include three layers: flat foil top foil, corrugated foil wave foil and supporting bottom plate. The bearing includes multiple corrugated foils and top foils. Each corrugated foil is fixed to the bottom plate by welding, and each top foil is fixed to the top foil or the bottom plate by welding, forming a structure in which the bottom plate supports the corrugated foil and the corrugated foil supports the top foil. When working, the top foil plane area contacts the rotor in a stationary state, and there is a wedge-shaped area formed by the supporting structure between the front and rear lobes. After the rotor rotates, the top foil needs to overcome the starting friction torque, and the rotor drags the gas with a certain viscosity in the surrounding environment into the wedge for compression. When the speed increases to a certain level, the rotor is suspended. During the operation of the bearing, the top foil overcomes the starting friction torque, and the corrugated foil provides support stiffness.

[0004] However, the bearing manufacturing process involves multiple manufacturing processes such as welding, which requires the manufacture of welding fixtures and welding quality management, and there are large fluctuations in product quality and performance. If the welding is not strong enough, the top foil of the bearing will fall off, which will cause irreversible destructive consequences. Therefore, conventional thrust gas foil bearings are disadvantageous in terms of quality management and are not suitable for mass production. Summary of the invention

[0005] The purpose of the present invention is to provide a laminated thrust gas foil bearing to solve the technical problems that the existing bearing production adopts welding technology, there is a risk of the top foil of the bearing falling off due to poor welding, and the performance and quality of the product fluctuate greatly, which is not suitable for mass production. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a laminated thrust gas foil bearing, comprising a first laminate and at least one second laminate arranged in sequence, wherein the first laminate and the second laminate are both arranged as a multi-petal structure, wherein:

[0008] The first laminate is configured as an integrated structure, including: a plurality of first petals, a first connecting structure and a third connecting structure, wherein every two adjacent first petals are connected by the first connecting structure, and the first connecting structure is connected to the third connecting structure;

[0009] The second laminate sheet includes: a plurality of second petals and a second connection structure, wherein the plurality of second petals are connected by the second connection structure.

[0010] Preferably, the first connecting structure is configured as a wave-shaped structure.

[0011] Preferably, the first lobe includes a wedge-shaped area and a planar supporting area which are arranged in sequence, and the wedge-shaped area of ​​the previous first lobe is connected to the planar supporting area of ​​the next first lobe through the first connecting structure.

[0012] Preferably, the second laminate is configured as a corrugated foil.

[0013] Preferably, the second lobe comprises a front end and a rear end arranged in sequence, wherein:

[0014] The front end is fixedly connected to the second connecting structure;

[0015] The end is configured as a cantilever free end.

[0016] Preferably, the third connection structure is configured as an annular structure, and the third connection structure is disposed at the periphery of the first petal.

[0017] Preferably, one end of the first connecting structure extends out of the end of the first petal and is fixed to the third connecting structure.

[0018] Preferably, the second connection structure is configured as an annular structure, and the second connection structure is disposed at the periphery of the second petal.

[0019] Preferably, the second connecting structure and the third connecting structure are both provided with pin holes.

[0020] Preferably, the second laminate is provided as an integral structure.

[0021] The laminated thrust gas foil bearing provided by the present invention eliminates the welding process in the bearing manufacturing process by designing the top foil of the first laminate into an integrated structure, which greatly simplifies the manufacturing process. At the same time, the integrated structure is conducive to ensuring the relative position between the petals. Compared with the traditional welded structure, it is more conducive to improving the quality of the bearing and effectively avoids the influence of welding quality on bearing quality management. It is suitable for mass production and the product performance and quality are stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of an embodiment of a laminated thrust gas foil bearing of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the top foil of the laminated thrust gas foil bearing of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the laminated thrust gas foil bearing wave foil of the present invention.

[0026] Figure 4 This is a schematic diagram of the working installation of the laminated thrust gas foil bearing of the present invention;

[0027] Figure 5 It is a schematic diagram of the circumferential development of the corrugated structure of the first layer of laminated sheets of the laminated thrust gas foil bearing of the present invention.

[0028] In the figure: 1. first layer of laminated sheets; 2. second layer of laminated sheets; 3. pins; 4. bearing seat; 5. thrust plate; 11. wedge-shaped area; 12. planar support area; 13. first connecting structure; 14. third connecting structure; 15. first pin hole; 21. front end; 22. end; 23. second connecting structure; 24. second pin hole. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0030] The present invention provides a laminated thrust gas foil bearing. Figure 1 Schematic diagram of the structure of this embodiment. Figure 1 As shown, the laminated thrust gas foil bearing comprises a first laminate 1 and at least one second laminate 2 arranged in sequence, and both the first laminate 1 and the second laminate 2 are arranged as a multi-petal structure, wherein:

[0031] The first laminate sheet 1 is set as an integrated structure, including: a plurality of first petals, a first connecting structure 13 and a third connecting structure 14, every two adjacent first petals are connected by the first connecting structure 13, and the first connecting structure 13 is connected to the third connecting structure 14;

[0032] The second laminate sheet 2 includes: a plurality of second petals and a second connecting structure 23 , and the plurality of second petals are connected by the second connecting structure 23 .

[0033] The first laminate 1 is the top foil, Figure 2 Schematic diagram of the structure of the top foil in this embodiment. Figure 2 As shown, the number of waves and petals of the bearing can be designed into different parameters according to different actual working conditions. By designing the top foil of the first laminate 1 into an integrated structure, the welding process in the bearing manufacturing process is eliminated, which greatly simplifies the manufacturing process. At the same time, the integrated structure is conducive to ensuring the relative position between the petals. Compared with the traditional welded structure, it is more conducive to improving the quality of the bearing and effectively avoids the influence of welding quality on bearing quality management.

[0034] As an optional implementation, the first connecting structure 13 is configured as a corrugated structure, which can buffer the tiny expansion of the top foil in the circumferential direction due to the load, increase the elasticity of the top foil in the circumferential direction, improve the elastic deformation range of the bearing, and improve the bearing capacity of the bearing.

[0035] As an optional embodiment, the first lobe includes a wedge-shaped area 11 and a planar support area 12 arranged in sequence, wherein the wedge-shaped area 11 in each lobe is used to produce a wedge effect, and the planar support area 12 mainly provides a bearing support function for supporting the load; the wedge-shaped area 11 of the previous first lobe is connected to the planar support area 12 of the next first lobe through a first connecting structure 13.

[0036] The planar support area 12 of the previous first lobe and the wedge-shaped area 11 of the next first lobe are connected together through a corrugated structure, which successfully compensates for the height difference between the wedge-shaped area 11 and the planar support area 12. The first connecting structure 13 is set as a corrugated structure to reduce the height of the wedge, increase the effective support area of ​​the thrust bearing, that is, increase the effective working area of ​​the thrust bearing. In addition, the corrugated structure can buffer the tiny expansion of the top foil in the circumferential direction due to the load, increase the elasticity of the top foil in the circumferential direction, improve the elastic deformation range of the bearing, and improve the bearing capacity of the bearing.

[0037] During the working process of the thrust bearing, it is subjected to the external load. Due to the elastic support of the corrugated foil, there will be a slight downward deformation in the vertical direction. The slight downward deformation will cause the bearing to expand slightly in the circumferential direction. For the corrugated foil, since the end of each petal is in a free state, it is easy to buffer this slight deformation. However, the top foil integrated structure hinders the free deformation of the top foil. This problem is solved by adding a corrugated elastic structure of the top foil.

[0038] As an optional embodiment, the second laminate 2 is a corrugated foil, which is mainly used to provide support for the bearing. Figure 3 Schematic diagram of the structure of the corrugated foil in this embodiment. Figure 3 As shown, it is set as a corrugated foil, and the number of corrugations and petals of the bearing can be designed to different parameters according to different actual working conditions. In actual use, a single layer of corrugated foil laminate or multiple layers of corrugated foil laminate can be designed, and the multiple layers of corrugated foil laminate are arranged in sequence.

[0039] As an optional implementation, the second lobe includes a front end 21 and an end 22 arranged in sequence, wherein: the front end 21 is fixedly connected to the second connecting structure 23; the end 22 is arranged as a cantilever free end. In this embodiment, the wave foil connects the front end 21 of each second lobe together through the second connecting structure 23 in the shape of an outer ring, and the end is in a free cantilever state, which makes the waveform structure simpler, the spatial arrangement of the waveform more free, and the waveform combination types more diverse.

[0040] As an optional embodiment, the third connecting structure 14 is configured as an annular structure, and the third connecting structure 14 is configured at the periphery of the first petal, specifically, as Figure 2 As shown, one end of the first connection structure 13 extends out of the end of the first petal and is fixed to the third connection structure 14. The annular third connection structure 14 arranged on the periphery of the first petal connects each first petal of the top foil of the first laminate 1 into a whole through the corrugated first connection structure 13 to form an integrated structure.

[0041] The integrated top foil includes three areas in the bearing support area: a wedge-shaped area, a plane area and a corrugated area. The wedge-shaped area is used to form a wedge shape, and the plane area is mainly used to support the load. During high-speed rotation, the rotor supported by the bearing brings a gas with a certain viscosity into the wedge-shaped area for compression, forming a dynamic pressure effect and forming the maximum pressure in the plane area.

[0042] As an optional implementation, the second connecting structure 23 is configured as an annular structure, and the second connecting structure 23 is arranged on the periphery of the second petal. In this embodiment, the front end 21 of the wave foil is connected to the annular second connecting structure 23, and the end 22 of the wave foil is in a cantilever free state. The second petals are connected into a whole through the outer circular ring second connecting structure 23 to form an integrated structure. By setting the outer circle of the wave foil as a circle of annular structure, the outer circle of the top foil is also a circle of annular structure, and the friction torque during startup is overcome by the annular structure.

[0043] As an optional implementation, the second connecting structure 23 and the third connecting structure 14 are both provided with pin holes, the second connecting structure 23 is provided with a second pin hole 24, and the third connecting structure 14 is provided with a first pin hole 15. By arranging a circle of annular connecting structures on the outer circles of the wave foil and the top foil, and arranging multiple pin holes on the annular structure, the bearing is installed and the circumferential rotation of the bearing is limited during operation.

[0044] Figure 4 Schematic diagram of the installation structure of this embodiment. Figure 4 As shown, the bearing wave foil and top foil are sequentially installed on the bearing seat 4 through the pin 3. During the operation of the bearing, a thrust bearing is installed on each side of the thrust plate 5 on the rotor. During the startup process, the friction torque is large, and the pin 3 limits the circumferential rotation of the bearing. During operation, the thrust plate 5 rotates at a high speed, bringing the gas with a certain viscosity in the surrounding environment into the wedge-shaped area of ​​the bearing.

[0045] Figure 5 : is a circumferential expansion view of the corrugated structure area of ​​this embodiment, as shown in Figure 5 As shown, during the operation of the bearing, the gas in the wedge-shaped area 11 is compressed to form a high-pressure gas film to support the thrust plate 5. Due to the bearing force in the vertical direction, the corrugated foil will have a slight elastic deformation in the vertical direction. The elastic deformation in the vertical direction will cause circumferential expansion. Since the end 22 of the corrugated foil is in a cantilever free state, the corrugated foil can be smoothly expanded in the circumferential direction. Similarly, the slight deformation of the top foil in the vertical direction will also cause it to expand in the circumferential direction. In this embodiment, the elastic function of the first corrugated connection structure 13 is used to buffer the expansion of the top foil in the circumferential direction, thereby increasing the allowable deformation of the bearing and improving the bearing capacity of the bearing.

[0046] As an optional implementation, the first laminated sheet 1 and the second laminated sheet 2 are both configured as an integrated structure. In this embodiment, by designing the top foil and the wave foil as an integrated structure, the welding process in the bearing manufacturing process is eliminated, which greatly simplifies the manufacturing process. At the same time, the integrated structure is conducive to ensuring the relative position between the petals, which is more conducive to improving the quality of the bearing compared to the traditional welded structure, and effectively avoids the influence of welding quality on bearing quality management.

[0047] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A laminated thrust gas foil bearing, characterized in that: It comprises a first laminate and at least one second laminate arranged in sequence, wherein the first laminate and the second laminate are both arranged as a multi-petal structure, wherein: The first laminate is configured as an integrated structure, including: a plurality of first petals, a first connecting structure and a third connecting structure, wherein every two adjacent first petals are connected by the first connecting structure, and the first connecting structure is connected to the third connecting structure; The second laminate sheet comprises: a plurality of second petals and a second connecting structure, wherein the plurality of second petals are connected by the second connecting structure; The first petal comprises a wedge-shaped area and a plane support area arranged in sequence, and the wedge-shaped area of ​​the previous first petal is connected to the plane support area of ​​the next first petal through the first connection structure; The second laminate is configured as a corrugated foil; The first connection structure is configured as a wave-shaped structure; The third connection structure is configured as an annular structure, and the third connection structure is disposed at the periphery of the first petal.

2. The laminated thrust gas foil bearing according to claim 1, characterized in that: The second lobe includes a front end and a rear end which are sequentially arranged, wherein: The front end is fixedly connected to the second connecting structure; The end is configured as a cantilever free end.

3. The laminated thrust gas foil bearing according to claim 1 or 2, characterized in that: One end of the first connecting structure extends out of the end of the first petal and is fixed to the third connecting structure.

4. The laminated thrust gas foil bearing according to claim 2, characterized in that: The second connection structure is configured as an annular structure, and the second connection structure is configured at the periphery of the second petal.

5. The laminated thrust gas foil bearing according to claim 1, characterized in that: The second connection structure and the third connection structure are both provided with pin holes.

6. The laminated thrust gas foil bearing according to claim 1, characterized in that: The second laminate is provided as an integral structure.

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