Dynamic pressure gas thrust bearing elastic support foil structure and preparation method thereof

Abstract

The present invention provides an elastic support foil structure for a dynamic pressure gas thrust bearing and a preparation method thereof. The structure comprises a leaf-shaped raised support sheet, a thin circular spring sheet, and a fan-shaped raised base sheet. The leaf-shaped raised support sheet has a semicircular key for positioning at one end, which is used to support the top foil. Semicircular keys, which are consistent with one end of the leaf-shaped raised support sheet, are evenly distributed on the inner diameter of the central circular hole of the thin circular spring sheet, and are used to fix the leaf-shaped raised support sheet and the fan-shaped raised base sheet. The leaf-shaped raised support sheet and the fan-shaped raised base sheet are alternately arranged on the front and back sides of the thin circular spring sheet. The inner and outer diameters of the fan-shaped raised base sheet are consistent with the inner and outer diameters of the thin circular spring sheet, and are used to support the thin circular spring sheet. The present invention provides an air film gap size adjustment function through the elastic deformation of the intermediate layer, which can improve the service life of the elastic support foil and enhance the reliability of the support foil.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic pressure gas bearings, in particular to an elastic supporting foil structure of a dynamic pressure gas thrust bearing and a preparation method thereof. Background Art

[0002] The hydrodynamic gas thrust bearing is a self-acting bearing with an elastic support structure, primarily consisting of a base plate, a supporting corrugated foil, and a top foil. Due to its use of air as the lubricant and its integration of an elastic support structure, this bearing is passively adjustable. Compared to traditional oil film bearings and rolling bearings, it offers advantages such as strong adaptability, cleanliness, high speed, low frictional power consumption, strong vibration resistance, a wide operating temperature range, and low maintenance costs. It has found widespread application in high-speed rotating machinery such as hydrogen fuel cell air compressors, refrigeration compressors, air suspension centrifugal blowers, micro gas turbines, turbogenerators, and aircraft environmental control systems.

[0003] Currently, the elastic support foil of traditional hydrodynamic gas thrust bearings is a corrugated foil. Due to the limitations of molding technology and material rebound, the overall height of the corrugated foil is generally greater than 1 mm. Studies have shown that if the height of the corrugated foil is too large, the elastic deformation ability of the corrugated foil will be weakened, thereby reducing the adaptive deformation ability of the hydrodynamic gas thrust bearing. In addition, the method of using corrugated foil to support flat foil is very cumbersome to process. In particular, corrugated foil requires a customized special mold for pressing, and the precision requirements are difficult to achieve at the micron level. The cumbersome processing technology and high precision requirements are not conducive to the development of practical applications of gas foil bearings, and the manufacturing cost is expensive.

[0004] Therefore, in order to enhance the elastic deformation of the supporting foil and improve the elastic capacity of the supporting foil, it is very important to adopt an elastic supporting foil with a laminated structure. Summary of the Invention

[0005] In order to solve the problems of the prior art, the present invention provides an elastic support foil structure for a dynamic pressure gas thrust bearing and a preparation method thereof. The elastic deformation of the intermediate layer provides an air film gap size adjustment function, which can improve the service life of the elastic support foil and enhance the reliability of the support foil.

[0006] The present invention provides an elastic support foil structure for a dynamic pressure gas thrust bearing, comprising a leaf-shaped protruding support sheet, a thin circular ring spring sheet, and a fan-shaped protruding base sheet. The leaf-shaped protruding support sheet has a semicircular key for positioning at one end, which is used to support a top foil; semicircular keys that are consistent with one end of the leaf-shaped protruding support sheet are evenly distributed on the inner diameter of the central circular hole of the thin circular ring spring sheet, which are used to fix the leaf-shaped protruding support sheet and the fan-shaped protruding base sheet; the leaf-shaped protruding support sheet and the fan-shaped protruding base sheet are alternately arranged on the front and back sides of the thin circular ring spring sheet; the inner diameter and outer diameter of the fan-shaped protruding base sheet are consistent with the inner diameter and outer diameter of the thin circular ring spring sheet, which is used to support the thin circular ring spring sheet.

[0007] Further improvement, the leaf-shaped raised support piece has a thickness of 0.1-0.3 mm, the thin annular spring piece has a thickness of 0.25-0.4 mm, the fan-shaped raised base piece has an arc of 30°-60°, and a thickness of 0.2-0.3 mm;

[0008] The present invention also provides a method for preparing an elastic support foil structure of a dynamic pressure gas thrust bearing, which is used to realize the combination of the above-mentioned leaf-shaped raised support sheet, thin annular spring sheet, and fan-shaped raised base sheet, and is characterized in that it is clamped by a curing positioning fixture and synthesized into a whole by bonding with high-temperature resin curing glue.

[0009] The specific steps are:

[0010] 1) Install the array keyway positioning block on the base according to the keyway fit, and install the thin ring spring on the array keyway positioning block;

[0011] 2) Align the leaf-shaped raised support plate positioning plate with the positioning hole and cover it on the thin circular spring leaf, and align and position it with the positioning pins and fix them in sequence;

[0012] 3) Apply high-temperature resin curing glue in the gap of the leaf-shaped raised support piece positioning plate, place the leaf-shaped raised support piece, heat and cure it, and then remove the leaf-shaped raised support piece positioning plate;

[0013] 4) Place the leaf-shaped protrusion support plate positioning plate and the combination of the leaf-shaped protrusion support plate and the thin circular spring plate upside down on the array keyway positioning block, align the fan-shaped protrusion base plate positioning plate along the positioning hole, and secure after positioning;

[0014] 5) Apply adhesive to the gap between the fan-shaped protrusion substrate fixing plate and place the fan-shaped protrusion substrate. After heating and curing, separate the leaf-shaped protrusion support sheet fixing plate and the fan-shaped protrusion substrate fixing plate from the leaf-shaped protrusion support sheet, the fan-shaped protrusion substrate, and the fan-shaped protrusion substrate.

[0015] 6) Fix the assembly with the leaf-shaped protrusion support piece, the fan-shaped protrusion base piece, and the thin annular spring piece on the array keyway positioning block, clamp it on the fixing plate, and laser cut the circumferential keyway.

[0016] The present invention also provides a curing positioning fixture for fixing the above-mentioned dynamic pressure gas thrust bearing elastic support foil structure, including an array keyway positioning block, a leaf-shaped protrusion support piece fixing plate, a fan-shaped protrusion substrate fixing plate and a base plate, wherein the array keyway positioning block is fixed on the base plate, and the outer contour of the array keyway positioning block is a cylinder, and keyways are evenly distributed on the circumference thereof and cooperate with the inner holes of the thin annular spring sheets; the leaf-shaped protrusion support piece positioning plate and the fan-shaped protrusion substrate positioning plate have pores that are consistent with the shapes of the leaf-shaped protrusion support piece and the fan-shaped protrusion substrate.

[0017] As a further improvement, the center of the base plate has a circular hole with a diameter consistent with that of the array keyway positioning block, and keys that match the keyways of the array keyway positioning block are evenly distributed on the circular hole.

[0018] As a further improvement, the leaf-shaped protrusion support piece positioning plate and the fan-shaped protrusion base piece positioning plate are provided with positioning holes for guiding and positioning, and the positions of the positioning holes on the leaf-shaped protrusion support piece positioning plate and the fan-shaped protrusion base piece positioning plate are consistent.

[0019] Preferably, the outer diameter of the elastic supporting foil assembly may be slightly larger than the final size to ensure the final cutting allowance.

[0020] Preferably, the number of the leaf-shaped protruding support pieces and the fan-shaped protruding base pieces of the elastic supporting foil can be 6, 8, or 12, and the size of the protruding foil can be appropriately adjusted according to actual needs.

[0021] Preferably, the leaf-shaped protrusion support piece fixing plate and the fan-shaped protrusion base piece fixing plate should be designed with reference to the corresponding leaf-shaped protrusion support piece and fan-shaped protrusion base piece to ensure the successful installation of the leaf-shaped protrusion support piece and fan-shaped protrusion base piece.

[0022] Preferably, the combination of the leaf-shaped protruding support sheet, the thin annular spring sheet, and the fan-shaped protruding base sheet should also include a vacuum brazing method.

[0023] Preferably, the leaf-shaped protrusion support piece fixing plate, the fan-shaped protrusion base piece fixing plate and the bottom plate should include bolt holes for locking in addition to the positioning holes.

[0024] Preferably, the array keyway positioning block, the leaf-shaped protrusion support piece positioning plate, the fan-shaped protrusion base piece positioning plate and the bottom plate are made of stainless steel, and the leaf-shaped protrusion support piece, the thin annular spring and the fan-shaped protrusion base piece are made of beryllium bronze.

[0025] The beneficial effects of the present invention are:

[0026] 1. The structure provided by the present invention provides the air film gap size adjustment function by the elastic deformation of the middle layer. The deformation of the middle layer occurs at circumferential intervals, so it can respond to the change of load in time, thereby improving the elastic deformation capacity.

[0027] 2. The preparation method provided by the present invention avoids the problem of insufficient precision of the "ring-convex" structure caused by stamping, and improves the molding precision through bonding. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0029] Figure 1 It is a three-dimensional schematic diagram of the combination of the leaf-shaped protruding support sheet of the elastic supporting foil and the thin circular spring sheet of the present invention;

[0030] Figure 2 It is a three-dimensional schematic diagram of the combination of the fan-shaped protruding base of the elastic supporting foil and the thin annular spring of the present invention;

[0031] Figure 3 Schematic diagram of the leaf-shaped raised support piece of the elastic supporting foil of the present invention;

[0032] Figure 4 The elastic supporting foil thin annular spring of the present invention;

[0033] Figure 5 Schematic diagram of the fan-shaped protrusion substrate of the elastic supporting foil of the present invention;

[0034] Figure 6 Schematic diagram of the array keyway positioning block in the method for preparing the elastic supporting foil of the present invention;

[0035] Figure 7 Schematic diagram of a leaf-shaped protruding support sheet fixing plate in the method for preparing an elastic supporting foil of the present invention;

[0036] Figure 8 Schematic diagram of a fan-shaped protruding substrate fixing plate in the method for preparing an elastic supporting foil of the present invention;

[0037] Figure 9 Schematic diagram of the bottom plate in the method for preparing the elastic supporting foil of the present invention;

[0038] Figure 10 Schematic diagram of the method for assembling the leaf-shaped protruding support sheet and the thin annular spring sheet in the method for preparing the elastic supporting foil of the present invention;

[0039] Figure 11 Schematic diagram of the method for assembling the fan-shaped protrusion substrate and the thin annular spring in the method for preparing the elastic supporting foil of the present invention;

[0040] Figure 12Schematic diagram of cutting the entire supporting foil in the method for preparing the elastic supporting foil of the present invention;

[0041] Figure 13 Comparison of elastic deformation between the elastic supporting foil of the present invention and the traditional corrugated supporting foil;

[0042] Figure 14 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] like Figures 1 to 5 and Figure 14 As shown, the laminated elastic supporting foil provided by the present invention is composed of a leaf-shaped protruding support sheet 11, a thin annular spring sheet 12 and a fan-shaped protruding base sheet 13, which are aligned and installed by a curing positioning fixture.

[0045] The leaf-shaped raised support piece has a semicircular key for positioning at one end, which is used to support the top foil; the inner diameter of the central circular hole of the thin circular spring piece is evenly distributed with semicircular keys consistent with one end of the leaf-shaped raised support piece, which are used to fix the leaf-shaped raised support piece and the fan-shaped raised base piece, and the leaf-shaped raised support piece and the fan-shaped raised base piece are staggered and arranged on the front and back sides of the thin circular spring piece; the inner diameter and outer diameter of the fan-shaped raised base piece are consistent with the inner diameter and outer diameter of the thin circular spring piece, which is used to support the thin circular spring piece.

[0046] The leaf-shaped raised support piece has a thickness of 0.1-0.3 mm, the thin annular spring piece has a thickness of 0.25-0.4 mm, the fan-shaped raised base piece has an arc of 30°-60°, and a thickness of 0.2-0.3 mm.

[0047] See Figures 6 to 9 Now, the installation fixture and operation method of the "ring-shaped" elastic support foil in this application are described.

[0048] The fixture primarily consists of a positioning unit and a fixing plate. The positioning unit comprises an array keyway positioning block 31 and a base plate 34. The array keyway positioning block 31 has keyways on its outer circumference that mate with the base plate 34. Together, the two form the fixture body. The fixing plate includes a leaf-shaped raised support plate fixing plate 32 and a raised base plate fixing plate 33.

[0049] like Figure 10 and Figure 11The leaf-shaped protruding support piece 11, the fan-shaped protruding base piece 13 and the thin annular spring piece 12 are combined in sequence.

[0050] First, fix the thin annular spring 12 on the array keyway positioning block 31 and the base plate 34 according to the positioning keyway, install the leaf-shaped raised support piece fixing plate 33 according to the position of the positioning pin, and lock it with bolts. After applying high-temperature resin curing glue on the leaf-shaped raised support piece 11, place it on the corresponding position of the leaf-shaped raised support piece fixing plate 33 and achieve high-temperature curing to achieve assembly.

[0051] Next, the leaf-shaped protrusion support piece 11 and thin circular spring 12 assembly, along with the leaf-shaped protrusion support piece fixing plate 32, are separated from the array keyway positioning block 31, flipped over, and fixed to the array keyway positioning block 33. The fan-shaped protrusion substrate fixing plate 33 is installed using the locating pins and tightened with bolts. After applying high-temperature resin curing adhesive to the fan-shaped protrusion substrate 13, it is placed in the corresponding position on the fan-shaped protrusion substrate fixing plate 33 and cured at high temperature to complete the assembly.

[0052] Next, the leaf-shaped protrusion support piece fixing plate 32 and the fan-shaped protrusion base piece fixing plate 33 are separated from the assembly of the leaf-shaped protrusion support piece 11 , the thin annular spring piece 12 and the fan-shaped protrusion base piece 13 .

[0053] Finally, if Figure 12 The assembly of the leaf-shaped protruding support piece 11, the thin circular spring piece 12 and the fan-shaped protruding base piece 13 is fixed on the array keyway positioning block, clamped on the fixing plate, and the circumferential keyway is cut by laser to realize the processing of the elastic foil.

[0054] The static simulation analysis of the elastic support foil in the present invention is as follows Figure 13 The results are shown in Figure 2 and compared with a corrugated support foil using the same material parameters. The results show that when the two support foils generate a 0.15mm axial force, the maximum reaction force on the surface of the corrugated support foil is 20kN, while the maximum reaction force on the surface of the bump support foil is 450N. Clearly, within the allowable load range of this type of elastic foil thrust bearing, the elastic support foil of the present invention exhibits superior elastic deformation capability compared to conventional corrugated support foil.

[0055] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, the above is only a preferred embodiment of the present invention. Since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any technical personnel familiar with this technical field is within the technical scope disclosed by the present invention. For ordinary technical personnel in this technical field, changes or replacements that can be easily thought of should be covered within the protection scope of the present invention without departing from the principle 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 method for preparing an elastic support foil structure for a dynamic pressure gas thrust bearing, comprising the following elastic support foil structure for a dynamic pressure gas thrust bearing, comprising a leaf-shaped protruding support sheet, a thin circular ring spring sheet, and a fan-shaped protruding base sheet, wherein the leaf-shaped protruding support sheet has a semicircular key for positioning at one end thereof, for supporting a top foil; semicircular keys that are consistent with one end of the leaf-shaped protruding support sheet are evenly distributed on the inner diameter of the central circular hole of the thin circular ring spring sheet, for fixing the leaf-shaped protruding support sheet and the fan-shaped protruding base sheet, the leaf-shaped protruding support sheet and the fan-shaped protruding base sheet being staggered and arranged on the front and back sides of the thin circular ring spring sheet; the inner and outer diameters of the fan-shaped protruding base sheet are consistent with the inner and outer diameters of the thin circular ring spring sheet, for supporting the thin circular ring spring sheet, characterized in that: The specific steps are: 1) Install the array keyway positioning block on the base according to the keyway fit, and install the thin ring spring on the array keyway positioning block; 2) Align the leaf-shaped raised support plate positioning plate with the positioning hole and cover it on the thin circular spring leaf, and align and position it with the positioning pins and fix them in sequence; 3) Apply high-temperature resin curing glue in the gap of the leaf-shaped raised support piece positioning plate, place the leaf-shaped raised support piece, heat and cure it, and then remove the leaf-shaped raised support piece positioning plate; 4) Place the leaf-shaped protrusion support plate positioning plate and the combination of the leaf-shaped protrusion support plate and the thin circular spring plate upside down on the array keyway positioning block, align the fan-shaped protrusion base plate positioning plate along the positioning hole, and secure after positioning; 5) Apply adhesive to the gap between the fan-shaped protrusion substrate fixing plate and place the fan-shaped protrusion substrate. After heating and curing, separate the leaf-shaped protrusion support sheet fixing plate and the fan-shaped protrusion substrate fixing plate from the leaf-shaped protrusion support sheet, the fan-shaped protrusion substrate, and the fan-shaped protrusion substrate. 6) Fix the assembly with the leaf-shaped protrusion support piece, the fan-shaped protrusion base piece, and the thin annular spring piece on the array keyway positioning block, clamp it on the fixing plate, and laser cut the circumferential keyway.

2. A curing positioning fixture for fixing an elastic support foil structure of a dynamic pressure gas thrust bearing, the elastic support foil structure of the dynamic pressure gas thrust bearing comprising a leaf-shaped raised support sheet, a thin circular spring sheet and a fan-shaped raised base sheet, the leaf-shaped raised support sheet having a semicircular key for positioning at one end for supporting a top foil; semicircular keys that are consistent with one end of the leaf-shaped raised support sheet are evenly distributed on the inner diameter of the central circular hole of the thin circular spring sheet, for fixing the leaf-shaped raised support sheet and the fan-shaped raised base sheet, the leaf-shaped raised support sheet and the fan-shaped raised base sheet being staggered and arranged on the front and back sides of the thin circular spring sheet; the inner and outer diameters of the fan-shaped raised base sheet are consistent with the inner and outer diameters of the thin circular spring sheet, for supporting the thin circular spring sheet, characterized in that: It includes an array keyway positioning block, a leaf-shaped protrusion support piece fixing plate, a fan-shaped protrusion substrate fixing plate and a bottom plate, wherein the array keyway positioning block is fixed on the bottom plate, and the array keyway positioning block has a cylindrical outer contour, and has keyways uniformly distributed on its circumference that penetrate and cooperate with the inner holes of the thin circular ring spring; the leaf-shaped protrusion support piece positioning plate and the fan-shaped protrusion substrate positioning plate have pores that are consistent with the shapes of the leaf-shaped protrusion support piece and the fan-shaped protrusion substrate.

3. The curing positioning fixture according to claim 2, characterized in that: The center of the bottom plate is provided with a circular hole with the same diameter as the array keyway positioning block, and keys matching the keyways of the array keyway positioning block are evenly distributed on the circular hole.

4. The curing positioning fixture according to claim 2, characterized in that: The leaf-shaped protrusion support piece positioning plate and the fan-shaped protrusion base piece positioning plate are provided with positioning holes for guiding and positioning, and the positions of the positioning holes on the leaf-shaped protrusion support piece positioning plate and the fan-shaped protrusion base piece positioning plate are consistent.

Images