A top foil and bottom foil integrated dynamic pressure gas thrust bearing

Abstract

This invention discloses a hydrodynamic gas thrust bearing with an integrated top and bottom foil, relating to the field of air bearing technology. It can significantly extend bearing life, improve load capacity, and slow down temperature rise. The technical solution of this invention includes several integrated foil sheets fixedly mounted on a thrust back plate. These integrated foil sheets are sequentially connected end-to-end to form a ring, with an overlapping area between adjacent integrated foil sheets. A corrugated foil sheet is provided in the overlapping area, fixedly connected to one of the integrated foil sheets and in contact with the other integrated foil sheet. This invention eliminates the traditional welding connection between the top foil sheet and the bearing back plate, thereby significantly extending the bearing's service life.

Description

Technical Field

[0001] This invention relates to the field of air bearing technology, specifically a dynamic pressure gas thrust bearing. Background Technology

[0002] Foil hydrodynamic gas bearings are oil-free high-speed bearings. Gas is drawn in from the tiny wedge-shaped surface formed by the rotating object and the bearing surface, creating a pressurized air film that provides load support. This type of bearing is a highly promising new type of bearing, used in air-suspended centrifugal blowers, small turbine engines, and aircraft air circulation systems. It features a simple and compact structure, resistance to high and low temperatures, high load capacity, strong impact resistance, low frictional power consumption, high speed, long service life, low cost, and clean, pollution-free operation.

[0003] In foil dynamic pressure gas bearings, the foil dynamic pressure gas thrust bearing is generally composed of corrugated foils, top foils, and a bearing back plate. The corrugated foils are welded to the bearing back plate, and the top foils cover the corrugated foils and are welded to the bearing back plate. For example, a Chinese invention patent published on April 2, 2019, entitled "An Elastic Foil Dynamic Pressure Gas Thrust Bearing" with application number "201821292290.1", shows that in the actual low-speed operation of rotating machinery, there is a certain friction between the thrust disc and the top foil in this type of foil dynamic pressure gas thrust bearing. Due to the influence of friction, the weld joints between the top foil and the bearing back plate will be worn under this operating environment, posing a certain lifespan risk and affecting some performance. Summary of the Invention

[0004] To address the above problems, this invention proposes a hydrodynamic gas thrust bearing with an integrated top and bottom foil, which can effectively extend the bearing's life, improve its load capacity, and slow down the temperature rise rate.

[0005] The technical solution of this invention includes several integral foil sheets 1 fixedly mounted on a thrust back plate 301. These integral foil sheets 1 are sequentially connected end-to-end to form a ring, with an overlapping area between adjacent integral foil sheets 1. A corrugated foil sheet 2 is provided in the overlapping area, and the corrugated foil sheet 2 is fixedly connected to one of the integral foil sheets 1 and in contact with the other integral foil sheet 1. In this way, the integral foil sheet 1 serves as both the top foil of one corrugated foil sheet 2 and the bottom foil of another corrugated foil sheet 2, thereby eliminating the traditional welding connection method between the top foil sheet and the bearing back plate, and significantly extending the service life of the bearing.

[0006] Furthermore, the integrated foil 1 is fan-shaped.

[0007] Furthermore, the integrated foil 1 is sequentially divided into a coating section 1.1, a ventilation section 1.2, and a corrugated foil fixing section 1.4. The coating section 1.1 of the integrated foil 1 is stacked on top of the corrugated foil fixing section 1.4 of another integrated foil 1, thereby forming an overlapping area for accommodating the corrugated foil 2 between the two.

[0008] Furthermore, a corrugated foil positioning groove 1.3 is provided between the ventilation section 1.2 and the corrugated foil fixing section 1.4.

[0009] Furthermore, the corrugated foil 2 is sequentially divided into a fixed section 2.1, a wave section 2.2, and a straight section 2.3. The fixed section 2.1 is the fixed area of ​​the corrugated foil 2 and the fixed section 1.4 of the corrugated foil. The wave section 2.2 and the straight section 2.3 are distributed alternately. The straight section 2.3 is in contact with the integral foil 1.

[0010] Furthermore, the fixed area of ​​the wave foil 2 is located outside the overlapping area.

[0011] Furthermore, the outer or inner side of the integrated foil is provided with an installation area for connecting the thrust backplate, thereby fixing the thrust bearing on the thrust backplate 301.

[0012] This invention eliminates the traditional welding connection between the top foil and the bearing back plate, thereby significantly extending the service life of the bearing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an integrated foil dynamic pressure gas thrust bearing.

[0014] Figure 2 This is a schematic diagram of the structure of a wave foil.

[0015] Figure 3 This is a schematic diagram of another type of integrated foil dynamic pressure gas thrust bearing.

[0016] Figure 4 This is a schematic diagram of another type of integrated foil structure.

[0017] Figure 5 This is a schematic diagram of another type of one-piece foil sheet.

[0018] Figure 6 This is a schematic diagram of the installation structure of a dynamic pressure gas thrust bearing.

[0019] Figure 7 This is a partial cross-sectional view of an integrated foil hydrodynamic gas thrust bearing.

[0020] Figure 8 This is an exploded circumferential view of an integrated foil hydrodynamic gas thrust bearing.

[0021] Among them, 1. integrated foil, 2. corrugated foil;

[0022] 1.1 Coating section; 11.2 Ventilation section; 11.3 Corrugated foil positioning groove; 11.4 Corrugated foil fixing section;

[0023] 2.1 Fixed segment; 2.2 Waveform segment; 2.3 Straight segment;

[0024] 301, Thrust base plate; 401, Thrust disc. Detailed Implementation

[0025] To clearly illustrate the technical features of this patent, the following detailed description is provided through specific embodiments and in conjunction with the accompanying drawings.

[0026] The present invention is as follows Figure 1 , 2 As shown, the device includes an integral foil sheet 1 and a corrugated foil sheet 2. Multiple integral foil sheets 1 and corrugated foil sheets 2 can be combined along the circumferential direction to form a hydrodynamic gas thrust bearing. One side of the integral foil sheet 1 is fixed with a corrugated foil sheet 2, and the other side covers another integral foil sheet 1 with a corrugated foil sheet 2 fixed on it, arranged circumferentially, and is in contact with the surface of the corrugated foil sheet 2. The integral foil sheet 1 is both the bottom foil of the corrugated foil sheet 2 and the top foil of the other corrugated foil sheet 2.

[0027] The integrated foil 1 has a fan-shaped structure; the wave foil 2 has a fixed section 2.1, a wave section 2.2, and a straight section 2.3. The fixed section 2.1 is the area where the wave foil 2 and the integrated foil fixed section 1.4 are fixed; the wave section 2.2 and the straight section 2.3 are distributed alternately; the straight section 2.3 is in contact with the integrated foil 1; after the multiple fixed integrated foils 1 and wave foils 2 are combined in the circumferential direction, the wave section 2.2 is in contact with another integrated foil 1.

[0028] Further improvements, such as Figure 3 , 4 As shown, the integrated foil 1 may include a coating section 1.1, a ventilation section 1.2, a corrugated foil positioning groove 1.3, and a corrugated foil fixing section 1.4. The coating section 1.1 is a region coated with wear-resistant material; the ventilation section 1.2 has multiple circular holes, forming a ventilation and cooling channel between the top and bottom of the integrated foil 1. The corrugated foil positioning groove 1.3 has a triangular notch structure, with its edge flush with the side edge of the corrugated foil, and the inner circle of the integrated foil coincides with the inner circle of the corrugated foil; the corrugated foil fixing section 1.4 fixes the corrugated foil 2 to the integrated foil 1.

[0029] As a further improvement, the fixed area of ​​the wave foil can be outside the coverage area of ​​the integrated foil.

[0030] Further improvements, such as Figure 5As shown, the integrated foil can be formed by cutting a flat sheet of material or by stamping or other methods.

[0031] Further improvements, such as Figure 6 As shown, the integrated foil can have an additional mounting area on the outer side or the inner side, thereby fixing the thrust bearing to the thrust back plate.

[0032] There are many specific ways to implement this invention. The above description is only a preferred embodiment of this invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of this invention, and these improvements should also be considered within the scope of protection of this invention.

Claims

1. A hydrodynamic gas thrust bearing with an integrated top and bottom foil, characterized in that, It includes several integral foils (1) fixedly installed on the thrust back plate. The several integral foils (1) are connected end to end to form a ring, and there is an overlapping area between two adjacent integral foils (1). A wave foil (2) is provided in the overlapping area. The wave foil (2) is fixedly connected to one of the integral foils (1) and in contact with the other integral foil (1). The integrated foil (1) is divided into a coating section (1.1), a ventilation section (1.2) and a corrugated foil fixing section (1.4) in sequence. The coating section (1.1) of the integrated foil (1) is stacked on top of the corrugated foil fixing section (1.4) of another integrated foil (1), thereby forming an overlapping area between the two to accommodate the corrugated foil (2).

2. The hydrodynamic gas thrust bearing with an integrated top and bottom foil as described in claim 1, characterized in that, The integrated foil (1) is fan-shaped.

3. The hydrodynamic gas thrust bearing with an integrated top and bottom foil as described in claim 1, characterized in that, A corrugated foil positioning groove (1.3) is provided between the ventilation section (1.2) and the corrugated foil fixing section (1.4).

4. The hydrodynamic gas thrust bearing with an integrated top and bottom foil as described in claim 1, characterized in that, The wave foil (2) is divided into a fixed section (2.1), a wave section (2.2), and a straight section (2.3) in sequence. The fixed section (2.1) is the fixed area of ​​the wave foil (2) and the fixed section (1.4) of the wave foil. The wave section (2.2) and the straight section (2.3) are distributed alternately. The straight section (2.3) is in contact with the integral foil (1).

5. The hydrodynamic gas thrust bearing with an integrated top and bottom foil as described in claim 1, characterized in that, The fixed area of ​​the foil (2) is located outside the overlapping area.

6. The hydrodynamic gas thrust bearing with an integrated top and bottom foil as described in claim 1, characterized in that, The outer or inner side of the integrated foil is provided with an installation area for connecting the thrust backplate.

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