Laminated gas thrust foil bearing device of cantilever structure

Abstract

The invention provides a laminated gas thrust foil bearing device with a cantilever structure. The laminated gas thrust foil bearing device comprises a bottom plate, a thick gasket is arranged on the bottom plate, a flat foil is arranged on the gasket, a thin gasket is arranged on the flat foil, and a top foil is arranged on the thin gasket. The device can be processed and produced without a mold, so that the production cost can be reduced. The top foil comprises a cantilever structure, the cross section of a cantilever is variable, the upper surface of the cantilever is inclined, an initial convergence gap can be formed, and the cantilever can further deform under the dynamic pressure effect to form elastic support. The length and the number of the cantilever structures can be changed, and the rigidity and the bearing capacity of the whole bearing can be adjusted through different parameter combinations so as to meet special requirements under different working conditions.

Description

Technical Field

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

[0002] Gas foil bearings have excellent lubrication properties and are suitable for various high-speed, light-load, and extremely high or low-temperature turbine machinery, such as micro gas turbines and air compressors. Compared with traditional sliding bearings, this type of bearing has the characteristics of good stability, low friction, high and low temperature resistance, long life, and no pollution.

[0003] Gas foil bearings first appeared in the design and development of air cycle machinery in 1969, and showed strong stability in the long test process afterwards. In 1976, gas foil bearings were first put into production in military units. Today, the theoretical and experimental research on gas foil bearings has been rapidly developed.

[0004] However, theoretical research on gas hydrodynamic foil bearings is still insufficient, and no universal design criteria have been formed, making it difficult to achieve standardization and serialization. In recent years, various new gas foil bearing structures have emerged one after another, and the design and development of each bearing requires a lot of time and cost. In the currently disclosed patents, gas thrust foil bearings used in high-speed turbine machinery mainly face the following problems: 1. The processing of foils in bearings almost all depends on specific molds, which requires a long production cycle and production cost. For example, the utility patent with patent number CN202320167407.8 discloses a stacked thrust foil gas bearing structure, in which the top layer of foil and the bottom layer of arch waves need to be formed by specific molds and need to undergo a long aging treatment, which increases the production cycle and cost of bearings. 2. For the most commonly used integral foil bearings, the installation and maintenance costs are relatively high. For example, in the utility model patent with patent number CN202321066944.X, an integral foil dynamic pressure gas thrust bearing structure is disclosed. The wave foil and the base plate are fixed by welding, which makes it difficult to replace the foil. When the foil fails, the only option is to replace the entire bearing. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a novel stacked gas thrust foil bearing transposition, comprising a bottom plate, a thick gasket is provided on the bottom plate, a flat foil is provided on the gasket, a thin gasket is provided on the flat foil, and a top foil is provided on the thin gasket;

[0006] The top foil is provided with a cantilever structure, the cantilever has a variable cross-section, and the thickness of the cantilever decreases along the cantilever direction;

[0007] The foils all include an outer circular ring, and the circular ring is provided with a plurality of positioning holes;

[0008] A plurality of positioning holes are arranged on the gasket and the bottom plate.

[0009] Preferably, the gasket, foil and base plate assembly are connected by bolts.

[0010] Preferably, the upper surface of the cantilever structure is inclined and the lower surface is horizontal.

[0011] Preferably, the cantilever structure is fan-shaped.

[0012] Preferably, the upper surface of the top foil is provided with a wear-resistant coating.

[0013] The stacked gas thrust foil bearing device proposed by the present invention has the following benefits: 1. The processing and production of all parts can be independent of molds, reducing production costs; 2. The top foil includes a cantilever structure, the cantilever is a variable cross-section, and the upper surface of the cantilever is inclined, which can form an initial convergent gap and can be further deformed under the dynamic pressure effect to form an elastic support. 3. The length and number of the cantilever structure on the top foil can be changed. Through different parameter combinations, the stiffness and load-bearing capacity of the entire bearing can be adjusted to meet the needs under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0015] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0016] Figure 2 An exploded view of the present invention;

[0017] Figure 3 is a schematic diagram of a top foil of the present invention;

[0018] Figure 4 It is a schematic diagram of the cantilever structure in the top foil of the present invention;

[0019] Figure 5 is a schematic diagram of a thin gasket of the present invention;

[0020] Figure 6 is a schematic diagram of a flat foil of the present invention;

[0021] Figure 7 It is a schematic diagram of a thick gasket of the present invention;

[0022] Among them, 1. top foil; 2. cantilever structure; 3. thin gasket; 4. flat foil; 5. thick gasket; 6. bottom plate; 7. bolts. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] like Figure 1 , Figure 2 As shown, the present invention proposes a stacked gas thrust foil bearing device, including a bottom plate 6; a thick gasket 5 is provided on the bottom plate 6, and a positioning hole is provided on the thick gasket 5; a flat foil 4 is provided on the thick gasket 5, and a positioning hole is provided on the outer ring of the flat foil 4; a thin gasket 3 is provided on the flat foil 4, and a positioning hole is provided on the thin gasket 3; a top foil 1 is provided on the thin gasket 3, and a positioning hole is provided on the outer ring of the top foil 1, and a cantilever structure 2 is provided on the inner ring of the top foil 1. Figure 4 As shown, the lower surface of the cantilever structure 2 is horizontal, the upper surface of the cantilever structure 2 is inclined, and the cantilever direction of the cantilever structure 2 needs to be opposite to the airflow direction. The inclination of the upper surface of the cantilever structure 2 allows the bearing to form an initial convergence gap, and the generated air film pressure causes the top foil 1 and the flat foil 4 to deform and form a new convergence gap, playing the role of elastic support. Changing the number of cantilever structures 2 can change the number of convergence air films of the bearing; changing the slope of the inclination of the upper surface of the cantilever structure 2 can change the initial air film distribution of the bearing; changing the number of cantilever structures 2, the thickness of the top foil 1, and the thickness of the flat foil 4 can change the stiffness of the bearing, thereby changing the bearing's load-bearing performance to meet the needs under different working conditions. When the foil bearing cannot meet the load-bearing requirements under specific working conditions, there is no need to replace the entire foil bearing, only the top foil 1 or the flat foil 4 needs to be replaced.

[0025] In addition, there are positioning holes on the top foil 1, thin gasket 3, flat foil 4, thick gasket 5 and bottom plate 6 to achieve circumferential and radial positioning. Adjusting the position of the positioning holes changes the circumferential relative position between the foil and the gasket. The positioning holes are connected by bolts 7, and the bolts 7 can finally fix the bottom plate 6 on the base (not shown). The upper surface of the top foil 1 is provided with a wear-resistant coating to increase the service life of the top.

Claims

1. A cantilever stacked gas thrust foil bearing transposition, comprising a base plate, characterized in that: A thick gasket is arranged on the bottom plate, a flat foil is arranged on the gasket, a thin gasket is arranged on the flat foil, and a top foil is arranged on the thin gasket.

2. The stacked gas thrust foil bearing transposed according to claim 1, characterized in that: A cantilever structure is arranged on the top foil, the cantilever has a variable cross-section, and the thickness of the cantilever decreases along the cantilever direction.

3. The stacked gas thrust foil bearing transposition according to claim 2, characterized in that: The cantilever direction of the cantilever structure needs to be opposite to the airflow direction.

4. The stacked gas thrust foil bearing transposition according to claim 2, characterized in that: The cantilever structure is fan-shaped, and the upper surface is inclined and the lower surface is horizontal.

5. The stacked gas thrust foil bearing transposition according to claim 1, characterized in that: The foils all include an outer ring, and a plurality of positioning holes are arranged on the ring.

6. The stacked gas thrust foil bearing transposition according to claim 1, characterized in that: A plurality of positioning holes are arranged on the gasket and the bottom plate.

7. The stacked gas thrust foil bearing transposed according to claim 5 and claim 6, characterized in that: The gasket, foil and base plate assembly are connected by bolts.

8. The stacked gas thrust foil bearing transposition according to claim 1, characterized in that: The upper surface of the top foil is provided with a wear-resistant coating.

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