Laminated foil aerodynamic bearing

Abstract

The invention relates to the technical field of gas dynamic pressure bearings, and provides a laminated foil gas dynamic pressure bearing which comprises a top foil, a V-shaped foil set and a bearing sleeve. Wherein the V-shaped foil set is formed by sequentially overlapping a first V-shaped foil, a second V-shaped foil and a third V-shaped foil, the first V-shaped foil is composed of a first V-shaped foil connecting beam and a first V-shaped foil V-shaped beam, the structures of the second V-shaped foil and the third V-shaped foil are similar to those of the first V-shaped foil, the orientation of the tip of the first V-shaped foil V-shaped beam is consistent with the rotation direction of the rotor, and the orientation of the tip of the first V-shaped foil V-shaped beam is consistent with the rotation direction of the rotor. The second V-shaped foils are opposite to the second V-shaped foils in orientation and opposite to the third V-shaped foils in orientation, the tip parts of the second V-shaped foils deform in the radial increasing direction of the bearing, the tip parts of the V-shaped beams of the second V-shaped foils deform in the radial decreasing direction of the bearing, and the tip parts of the V-shaped beams of the second V-shaped foils are arranged on the inner sides of the tip parts of the V-shaped beams of the first V-shaped foils to form a crossed structure; the axial length of the top foil is smaller than or equal to that of the first foil, one end of the top foil and one end of the foil set are fixed to the bearing sleeve, and the other end is free. According to the laminated multi-layer V-shaped foil, a plurality of simply supported beam supporting structures are formed, the plastic deformation is reduced, the structural damping of the bearing is increased, the axial gas film thickness of the bearing is changed through the crossed structure of every two adjacent layers of foil, the deformation of the top foil between the V-shaped beams generates the effect similar to the gas gathering effect of a notch groove bearing, and the operation stability of a rotor system is facilitated.

Description

Technical Field

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

[0002] Foil gas dynamic pressure bearings use ambient gas as the lubricating medium, and use the rotor to drive the gas into the wedge-shaped space between the top foil and the rotor, forming a significant dynamic pressure effect, causing the rotor to suspend in the gas. Therefore, foil gas dynamic pressure bearings have the advantages of oil-free lubrication and high efficiency, and are widely used in high-speed, light-load rotating equipment such as high-speed air cycle machines, fuel cell air compressors, micro gas turbines, and micro turbojet engines.

[0003] The traditional foil gas bearing consists of a top foil, a wave foil and a bearing sleeve. The wave foil is pressed into a wavy structure by a mold, and the top foil is bent. When the rotor is under heavy load or vibrates with large amplitude, the wave foil is subjected to static and impact loads for a long time. At the same time, the curvature of its arc structure will gradually increase. The wave foil is prone to plastic deformation, which causes the gap between the top foil and the rotor to become larger, thereby affecting the stability of the rotor system. The wave foil is in contact with the top foil and the bearing sleeve at the same time, but the small number of contact points causes the bearing damping to be small, which is a structural defect. In addition, since the wave foil is obtained by mold pressing, different pressing molds need to be processed for different usage requirements, which increases the complexity and cost of the wave foil processing technology. The boundary effect at the bearing end causes the air film pressure to present a parabolic distribution with a large middle and small ends. The air film gap in the middle of the top foil is large, while the gap at the two ends is small, which is prone to wear. Summary of the Invention

[0004] In response to the above-mentioned technical deficiencies, the present application provides a laminated foil gas hydrodynamic bearing, which replaces the corrugated foil in the existing bearing with a laminated multi-layer foil group, simplifies the processing technology, forms several simply supported beam structures, solves the technical problems of low damping, easy plastic deformation and local wear of the existing foil gas hydrodynamic bearing, and improves the service life of the gas bearing.

[0005] To achieve the above technical objectives, the present invention provides the following technical solutions: a laminated foil gas dynamic pressure bearing, comprising a top foil, a V-shaped foil group and a bearing sleeve; The V-shaped foil group is composed of a plurality of first V-shaped foils, a second V-shaped foil, and a third V-shaped foil which are radially stacked in sequence. The number of foils can be increased and the arrangement order of the foils can be changed according to actual needs. The first V-shaped foil is composed of a plurality of first V-shaped foil connecting beams distributed circumferentially and two first V-shaped foil V-shaped beams at the axial ends of the foil. The tip of the first V-shaped foil V-shaped beam is consistent with the direction of rotation of the rotor, and the tip is deformed in the direction of radial increase of the bearing. The second V-shaped foil and the third V-shaped foil are similar in structure to the first V-shaped foil. The second V-shaped foil is composed of a plurality of second V-shaped foil connecting beams distributed circumferentially and two second V-shaped foil V-shaped beams at the axial ends of the foil. The second V-shaped foil V-beam is oriented in the opposite direction to the first V-shaped foil V-beam, and its tip is deformed in the direction of reducing the radial direction of the bearing. The tip of the second V-shaped foil V-beam is placed inside the tip of the first V-shaped foil V-beam to form a cross structure and change the thickness of the air film in the axial direction of the bearing; the third V-shaped foil is composed of a plurality of third V-shaped foil connecting beams distributed circumferentially and two third V-shaped foil V-beams at the axial ends of the foil. The direction of the third V-shaped foil V-beam is the same as that of the first V-shaped foil V-beam and is placed between two adjacent first V-shaped foil V-beams. The three V-shaped foils have the same axial length, and their V-shaped foil connecting beams overlap at the ends of the foil. The top foil is a thin plate curled into an arc-shaped foil, the end of which is V-shaped, consistent with the direction of the V-shaped beam of the first V-shaped foil. The axial length of the top foil is smaller than the axial length of the V-shaped beam of the V-shaped foil group. The top foil and the V-shaped foil group are pinned or welded to the inner surface of the bearing sleeve. The deformation of the top foil at two adjacent V-shaped beams is greater than the deformation of the top foil at the V-shaped beam, forming a gas gathering effect similar to that of a grooved bearing, thereby improving the bearing capacity and stability.

[0006] Optionally, the axial lengths of the first V-shaped foil, the second V-shaped foil, and the third V-shaped foil may be different, and the connecting beams of the three foils are not in the same axial position, ensuring that the connecting beam of the third V-shaped foil has radial deformation space.

[0007] Optionally, the V-shaped foil group is replaced by a V-shaped foil group modification 1, wherein the V-shaped foil group modification 1 consists of a third V-shaped foil, a third V-shaped foil modification 1, and a third V-shaped foil modification 2. The third V-shaped foil, the third V-shaped foil modification 1, and the third V-shaped foil modification 2 all consist of a third V-shaped foil V-beam and a three-V-foil connecting beam. The three foils have the same structure but different positions. The third V-shaped foil modification 2 has the same orientation as the third V-foil and opposite to the third V-shaped foil modification 1. The V-beam of the third V-shaped foil modification 2 is placed between two adjacent V-beams of the third V-foil. The width of the V-beam of the third V-foil modification 2 is smaller than the distance between two adjacent V-beams of the third V-foil. The V-beams of the three foils cannot overlap at the same circumferential direction or circumferential position to ensure that the V-beam has radial deformation space.

[0008] Optionally, the V-shaped foil group is replaced by a V-shaped foil group modification 2, which is composed of a third V-shaped foil, a third V-shaped foil modification 3, and a third V-shaped foil modification 4. The third V-shaped foil modification 4 is composed of circumferentially distributed foil V-shaped beams and a third V-shaped foil modification 4 connecting beam located in the middle. The third V-shaped foil modification 3 is composed of circumferentially distributed foil V-shaped beams and an axially distributed third V-shaped foil modification 3 connecting beam. The foil V-shaped beams of the third V-shaped foil modification 4 are oriented in the same direction as the foil V-shaped beams of the third V-shaped foil modification 4. The third V-shaped foil modification 3 is opposite to the third V-shaped foil. The V-shaped beam of the third V-shaped foil modification 4 is located between two adjacent V-shaped beams of the third V-shaped foil. The connecting beam of the third V-shaped foil modification 4 and the connecting beam of the third V-shaped foil modification 3 are not in the same axial position. The axial lengths of the third V-shaped foil modification 3 and the third V-shaped foil modification 4 are the same and smaller than the axial length of the third V-shaped foil. The axial length of the top foil is the same as that of the third V-shaped foil modification 3. Optionally, the V-shaped foil group is replaced by a V-shaped foil group modification 3, which consists of a third V-shaped foil, a third V-shaped foil modification 3, and a third V-shaped foil modification 4. The foil V-beam of the third V-shaped foil modification 4 is oriented in the same direction as that of the third V-shaped foil modification 3, and opposite to the third V-shaped foil. The foil V-beam of the third V-shaped foil modification 4 is located between two adjacent foil V-beams of the third V-shaped foil modification 3. The foil V-beam of the third V-shaped foil modification 4 is supported by the foil V-beam of the third V-shaped foil modification 3 and the connecting beam of the third V-shaped foil modification 3. The three foil V-beams cannot overlap at the same circumferential direction or circumferential position.

[0009] Optionally, the V-shaped foil group is replaced by a V-shaped foil group modification 4, and the V-shaped foil group modification 4 consists of a third V-shaped foil modification 5, a third V-shaped foil modification 3, and a third V-shaped foil modification 4. The axial length of the three foils is such that the third V-shaped foil modification 5 consists of a circumferentially distributed foil V-beam and an axially distributed third V-shaped foil modification 5 connecting beam. The third V-shaped foil modification 3 connecting beam is not in the same axial position as the third V-shaped foil modification 4 connecting beam and the third V-shaped foil modification 5 connecting beam.

[0010] Optionally, the foils in the foil group and its modifications can be replaced by double V-shaped foils, W-shaped foils, offset V-shaped foils, C-shaped foils, cross-shaped foils, cross-shaped foil modification 1, N-shaped foils, N-shaped foil modification 1, H-shaped foils, and X-shaped foils, and their placement direction can be along the axial direction or along the circumferential direction; the beam structure and the size of the connecting beam of different foils can be partially or completely changed in length, width, and thickness according to actual needs to achieve changes in axial stiffness and circumferential stiffness; wherein, the double V-shaped foil is composed of two V-shaped beams 1 and V-shaped beams 2 with different angles and the same direction, replacing the V-beam in the V-shaped foil group, and the double V-shaped foil There is a connecting beam at the end of the foil, which connects the circumferentially distributed double V-shaped beams into a foil as a whole, where V-shaped beams 1 and 2 can be placed at any position in the axial direction of the foil (middle, end, offset); W-shaped foil is two V-shaped beams 3 and 4 facing opposite directions connected to replace the V-shaped beams in the V-shaped foil group, and the angles between the two V-shaped beams can be the same or different; the offset V-shaped foil is composed of an offset V-shaped beam and a connecting beam at the end of the foil. The tip of the offset V-shaped beam is not in the middle of the offset V-shaped foil (i.e. L1≠L2). The direction and distance of the offset are set according to actual needs. In a foil group composed of multiple layers of offset V-shaped foil, the upper layer The offset direction of the offset V-beam does not affect the selection of the offset direction of the lower offset V-beam; the C-shaped foil is composed of multiple C-beams distributed along the axial or circumferential direction of the bearing and axially distributed connecting beams, the C-beams are arcs or multi-segment lines, and the distance between adjacent C-beams is greater than the width of a single C-beam; the cross-shaped foil contains several circumferentially distributed I-beams and several axially distributed straight beams, the two are perpendicular to each other or have an angle, a single I-shaped connecting beam is composed of multiple straight beams, and adjacent straight beams on different I-shaped connecting beams do not touch; the cross-shaped foil modification 1 is changed from partially or completely axially distributed to I-beams of different widths. The N-shaped foil comprises a plurality of circumferentially distributed N-shaped beams or axially distributed N-shaped beam modifications 1 and axially distributed connecting beams, the ends of the N-shaped beams are coupled to the connecting beams, and the tips of the N-shaped beam modifications 1 are coupled to the connecting beams, forming the N-shaped foil modification 1; the H-shaped foil comprises a plurality of H-shaped beams distributed along the axial direction of the connecting beams, both ends of the H-shaped beams are coupled to the connecting beams, and the distance between two adjacent H-shaped beams is less than the distance between a single H-shaped beam; the X-shaped foil comprises an X-shaped beam and a connecting beam, and the X-shaped beam can be a single one distributed along the axial direction of the connecting beam, or a plurality of X-shaped beams can be coupled together to form a mesh structure.

[0011] The present application can be used as a laminated thrust foil bearing, which is composed of a thrust bearing sleeve, a thrust foil group, and a thrust top foil, wherein the thrust foil group is composed of a thrust first foil, a thrust second foil, and a thrust third foil stacked in sequence along the bearing axial direction, and the thrust first foil, the thrust second foil, and the thrust third foil are all obtained by cutting or punching flat foils, and are composed of a thrust foil outer ring, a thrust foil limiting hole, a thrust foil V-shaped beam, and a thrust foil inner ring. The thrust foil V-shaped beam of the thrust first foil is raised to a certain height than the position of the thrust foil outer ring and the thrust foil inner ring, and the thrust foil V-shaped beam of the thrust second foil is raised to a certain height than the thrust foil outer ring and the thrust foil inner ring. The outer circle of the foil and the inner circle of the thrust foil must be recessed to a certain height, the thrust foil V-shaped beam of the third thrust foil is not deformed, the thrust foil V-shaped beam of the first thrust foil is oriented in the opposite direction to that of the second thrust foil and the third thrust foil, and after installation, the end of the thrust foil V-shaped beam of the second thrust foil is placed above the end of the thrust foil V-shaped beam of the first thrust foil, forming a cross structure between the thrust foil V-shaped beams of the two foils, and the thrust foil V-shaped beam of the third thrust foil is placed between the two adjacent thrust foil V-shaped beams of the second thrust foil and supports the end of the thrust foil V-shaped beam of the first thrust foil; The thrust top foil consists of a thrust top foil outer ring, a thrust top foil connecting beam, a thrust top foil supporting surface, and a thrust top foil limiting hole. The thrust foil group and the thrust top foil are constrained to the thrust bearing sleeve through multiple limiting holes at the radial end. The radial length of the thrust top foil supporting surface is smaller than the radial length of the V-shaped beam of the thrust first foil. The circumferential end of the thrust top foil supporting surface is V-shaped, the same shape as the thrust foil group, its direction is consistent with the direction of rotation of the rotor, and it is fixed on the surface of the thrust third foil.

[0012] Optionally, only the support surface part of the thrust top foil is retained, and the support surface of the thrust top foil is fixed on the thrust foil group; the V-shaped foil group and its modifications, double V-shaped foils, W-shaped foils, offset V-shaped foils, C-shaped foils, cross-shaped foils, cross-shaped foil modification 1, N-shaped foils, N-shaped foil modification 1, H-shaped foils, and X-shaped foils used in radial bearings can all be used in thrust foil bearings.

[0013] The technical solution adopted by the present invention has the following beneficial effects: the present invention forms a foil group by radially stacking foils composed of V-shaped beams and connecting beams. The tip of the V-shaped beam of the first V-shaped foil is in the same direction as the rotation direction of the rotor, opposite to the direction of the second V-shaped foil and the direction of the third V-shaped foil, and the tip deforms in the direction of increasing the radial direction of the bearing. The tip of the V-shaped beam of the second V-shaped foil is deformed in the direction of decreasing the radial direction of the bearing. The tip of the V-shaped beam of the second V-shaped foil is placed inside the tip of the V-shaped beam of the first V-shaped foil, forming a cross structure, which changes the thickness of the air film in the axial direction of the bearing; the V-shaped beams of adjacent foils contact to form a structure similar to a simply supported beam, avoiding plastic deformation. The deformation of the top foil between the V-shaped beams produces an effect similar to the air gathering effect of a grooved bearing, which is beneficial to the operational stability of the rotor system. Moreover, the multi-layer foils are all obtained by directly cutting and processing flat foils. They have a simple structure, simplified processing technology, and do not require molds. They can adapt to the requirements of different products for foil inclined beams and connecting beams. The multi-layer structure obtains several contact points, which increases the friction damping of the bearing and solves the technical problems of low damping, easy plastic deformation and local wear of existing foil gas dynamic pressure bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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.

[0015] Figure 1 An exploded view of a laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0016] Figure 2 Schematic diagram of a V-shaped foil assembly of a laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0017] Figure 3 Schematic diagram of a first V-shaped foil of a laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0018] Figure 4 Schematic diagram of the second V-shaped foil of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0019] Figure 5 Schematic diagram of the third V-shaped foil of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0020] Figure 6 Schematic diagram of a V-shaped foil assembly modification 1 of a laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0021] Figure 7 Exploded view of a V-shaped foil assembly modification 2 of a laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0022] Figure 8 A front view of a modified V-shaped foil assembly 2 of a laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0023] Figure 9 Schematic diagram of V-shaped foil group modification 3 of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0024] Figure 10 Schematic diagram of a V-shaped foil assembly modification 4 of a laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0025] Figure 11 Schematic diagram of a third V-shaped foil modification 5 of a laminated foil aerodynamic bearing provided in an embodiment of the present invention.

[0026] Figure 12 Schematic diagram of the double V-shaped foils of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0027] Figure 13 Schematic diagram of the W-shaped foil of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0028] Figure 14 Schematic diagram of the offset V-shaped foil of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0029] Figure 15 Schematic diagram of the C-shaped foil of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0030] Figure 16 Schematic diagram of the cross-shaped foil of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0031] Figure 17 Schematic diagram of a cross-shaped foil modification 1 of a laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0032] Figure 18 Schematic diagram of the N-shaped foil of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0033] Figure 19 Schematic diagram of N-shaped foil modification 1 of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0034] Figure 20 Schematic diagram of the H-shaped foil of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0035] Figure 21 Schematic diagram of the X-shaped foil of the laminated foil gas dynamic pressure bearing provided in an embodiment of the present invention.

[0036] Figure 22 An exploded view of a laminated thrust foil bearing provided in an embodiment of the present invention.

[0037] Figure 23 Schematic diagram of a thrust foil assembly of a laminated thrust foil bearing provided in an embodiment of the present invention.

[0038] Figure 24 Schematic diagram of the third thrust foil of the laminated thrust foil bearing provided in an embodiment of the present invention.

[0039] Figure 25 Schematic diagram of the thrust top foil of the laminated thrust foil bearing provided in an embodiment of the present invention.

[0040] Among them, the marks of the figures in the figures are: 1-V-shaped foil group, 2-V-shaped foil group modification 1, 3-V-shaped foil group modification 2, 4-V-shaped foil group modification 3, 5-V-shaped foil group modification 4, 10-bearing sleeve, 11-top foil, 13-first V-shaped foil, 14-second V-shaped foil, 15-third V-shaped foil, 16-third V-shaped foil modification 1, 17-third V-shaped foil modification 2, 18-third V-shaped foil modification 3, 19-third V-shaped foil modification 4, 20-third V-shaped foil modification 5, 21-double V-shaped foil, 22-W-shaped foil, 23-biased V-shaped foil, 24-C-shaped foil, 25-X-shaped foil, 26-X-shaped foil modification 1, 27-N-shaped foil, 28-N-shaped foil modification 1, 29-H-shaped foil, 30-X-shaped foil, 60-thrust bearing sleeve, 61-thrust foil group, 62-thrust top foil, 131-first V-shaped foil connecting beam, 132-first V-shaped foil V-shaped beam, 141-second V-shaped foil connecting beam, 142-second V-shaped foil V-shaped beam, 151-third V-shaped foil connecting beam, 152-third V-shaped foil V-shaped beam, 191-foil V-shaped beam, 192-third V-shaped foil modification 4 connecting beam, 181-third V-shaped foil modification 3 connecting beam, 201 - Third V-shaped foil modification 5 connecting beam, 211 - V-shaped beam 1, 212 - V-shaped beam 2, 221 - V-shaped beam 3, 222 - V-shaped beam 4, 2311 - Offset V-shaped beam, 241 - C-shaped beam, 251 - I-shaped beam, 252 - I-shaped beam, 261 - I-shaped beam modification 1, 262 - I-shaped beam modification 1, 271 - N-shaped beam, 281 - N-shaped beam modification 1, 291 - H-shaped beam, 301-X-shaped beam, 611-thrust first foil, 612-thrust second foil, 613-thrust third foil, 621-thrust top foil outer ring, 622-thrust top foil connecting beam, 623-thrust top foil supporting surface, 624-thrust top foil limiting hole, 6131-thrust foil outer ring, 6132-thrust foil limiting hole, 6133-thrust foil V-shaped beam, 6134-thrust foil inner ring. DETAILED DESCRIPTION

[0041] To further clarify the objectives, technical solutions, and advantages of the present invention, the technical solutions of the present invention are described in detail below. It should be understood that the embodiments described herein are merely a portion of the embodiments of the present invention, and are not intended to be exhaustive. All other implementations derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0042] It should be noted that in the description of the present invention, unless otherwise specified, "plurality" means two or more; the terms "upper", "lower", "inner", "outer", "first", "second", "third", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "modification 1", "modification 2", etc. are only used to describe the differences from the original structure, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0043] refer to Figures 1 to 5 The present application provides a laminated foil gas dynamic pressure bearing, comprising a top foil (11), a V-shaped foil group (1) and a bearing sleeve (10); wherein the V-shaped foil group (1) is composed of a first V-shaped foil (13), a second V-shaped foil (14), and a third V-shaped foil (15) radially stacked, all of which are obtained by cutting and bending flat foils; the first V-shaped foil (13) is composed of a plurality of first V-shaped foil connecting beams (131) distributed in the circumferential direction and two first V-shaped foil V-shaped beams (131) at the axial ends of the foil. 32), the distance between two adjacent first V-shaped foil V-shaped beams (132) is greater than the width of the first V-shaped foil V-shaped beam (132), the tip of the first V-shaped foil V-shaped beam (132) is aligned with the direction of rotation of the rotor, and the tip is deformed in the direction of increasing radial direction of the bearing; the second V-shaped foil (14) is composed of a plurality of second V-shaped foil connecting beams (141) distributed in the circumferential direction and two second V-shaped foil V-shaped beams (142) at the axial ends of the foil, and the second V-shaped foil V-shaped beam (142) The direction is opposite to that of the first V-shaped foil V-shaped beam (132), and its tip portion is deformed in the direction of reducing the radial direction of the bearing. The tip portion of the second V-shaped foil V-shaped beam (142) is placed inside the tip portion of the first V-shaped foil V-shaped beam (132), forming a cross structure and changing the thickness of the air film in the axial direction of the bearing. The circumferential overlap size of the first V-shaped foil V-shaped beam (132) and the second V-shaped foil V-shaped beam (142) is adjusted according to actual conditions. The third V-shaped foil (15) is composed of a plurality of third V-shaped foils distributed in the circumferential direction. The top foil is an arc-shaped foil with a V-shaped end. The top foil is shorter in axial length than the V-shaped beam of the V-shaped foil group. The top foil and the V-shaped foil group are fixed to the inner surface of the bearing sleeve by pins or welding.

[0044] refer to Figure 6 The V-shaped foil group (1) is replaced by the V-shaped foil group modification 1 (2), wherein the V-shaped foil group modification 1 (2) is composed of a third V-shaped foil (15), a third V-shaped foil modification 1 (16), and a third V-shaped foil modification 2 (17). The third V-shaped foil (15), the third V-shaped foil modification 1 (16), and the third V-shaped foil modification 2 (17) are all composed of a third V-shaped foil V-shaped beam (152) and a three-V-shaped foil connecting beam (151). The three foils have the same structure but different positions. The third V-shaped foil The modified sheet 2 (17) has the same orientation as the third V-shaped foil (15) and is opposite to the orientation of the third V-shaped foil modified sheet 1 (16). The V-shaped beam of the modified sheet 2 (17) is placed between two adjacent V-shaped beams (152) of the third V-shaped foil. The width of the V-shaped beam of the modified sheet 2 (17) is less than the distance between the two adjacent V-shaped beams (152) of the third V-shaped foil. The V-shaped beams of the three foils cannot overlap at the same circumferential direction or circumferential position, ensuring that the V-shaped beam has radial deformation space.

[0045] refer to Figures 7 and 8 , the V-shaped foil group (1) is replaced by the V-shaped foil group modification 2 (3), wherein the V-shaped foil group modification 2 (3) is composed of a third V-shaped foil (15), a third V-shaped foil modification 3 (18), and a third V-shaped foil modification 4 (19), the third V-shaped foil modification 4 (19) is composed of a circumferentially distributed foil V-shaped beam (192) and a third V-shaped foil modification 4 connecting beam (191) located in the middle, the third V-shaped foil modification 3 (18) is composed of a circumferentially distributed foil V-shaped beam (192) and an axially distributed third V-shaped foil modification 3 connecting beam (181), and the foil V-shaped beam ( 192) is oriented in the opposite direction to the third V-shaped foil modification 3 (18), and is the same as the third V-shaped foil (15). The foil V-shaped beam (192) of the third V-shaped foil modification 4 (19) is located between two adjacent third V-shaped foil V-shaped beams (152). The third V-shaped foil modification 4 connecting beam (191) and the third V-shaped foil modification 3 connecting beam (181) are not in the same axial position. The axial lengths of the third V-shaped foil modification 3 (18) and the third V-shaped foil modification 4 (19) are the same and smaller than the axial length of the third V-shaped foil (15). The axial length of the top foil (11) is the same as that of the third V-shaped foil modification 3 (18). refer to Figure 9The V-shaped foil group (1) is replaced by a V-shaped foil group modification 3 (4), and the V-shaped foil group modification 3 (4) is composed of a third V-shaped foil (15), a third V-shaped foil modification 3 (18), and a third V-shaped foil modification 4 (19). The foil V-shaped beam (192) of the third V-shaped foil modification 4 (19) is oriented in the same direction as the third V-shaped foil modification 3 (18) and opposite to the third V-shaped foil (15). The foil V-shaped beam (192) of the third V-shaped foil modification 4 (19) is located between two adjacent foil V-shaped beams of the third V-shaped foil modification 3 (18), and the three foil V-shaped beams cannot overlap at the same circumferential direction or circumferential position.

[0046] refer to Figures 10 and 11 , the V-shaped foil group (1) is replaced by the V-shaped foil group modification 4 (5), the V-shaped foil group modification 4 (5) is composed of the third V-shaped foil modification 5 (20), the third V-shaped foil modification 3 (18), and the third V-shaped foil modification 4 (19), the axial lengths of the three foils, the third V-shaped foil modification 5 (20) is composed of the circumferentially distributed foil V-shaped beam (192) and the axially distributed third V-shaped foil modification 5 connecting beam (201), the third V-shaped foil modification 3 connecting beam (181) and the third V-shaped foil modification 4 connecting beam (191) and the third V-shaped foil modification 5 connecting beam (201) are not in the same axial position.

[0047] refer to Figures 12 to 21The foils in the foil group and its modifications can be replaced by double V-shaped foils (21), W-shaped foils (22), offset V-shaped foils (23), C-shaped foils (24), cross-shaped foils (25), cross-shaped foil modification 1 (26), N-shaped foils (27), N-shaped foil modification 1 (28), H-shaped foils (29), and X-shaped foils (30), and their placement direction can be along the axial direction or along the circumferential direction; the beam structure and the size of the connecting beam of different foils can be partially or completely changed in length, width, and thickness according to actual needs to achieve axial stiffness changes and circumferential stiffness changes; wherein, the double V-shaped foil (21) includes two V-shaped beams 1 (211) and V-shaped beams 2 (212) with different angles and the same direction, The V-shaped beam 1 (211) and the V-shaped beam 2 (212) can be placed at any position (middle, end, offset) in the axial direction of the foil; the W-shaped foil (22) comprises a superposition of two V-shaped beams 3 (221) and a V-shaped beam 4 (222) facing in opposite directions, and the angles between the two V-shaped beams can be the same or different; the offset V-shaped foil (23) is composed of an offset V-shaped beam (231) and a connecting beam at the end of the foil, and the tip of the offset V-shaped beam (231) is not in the middle of the offset V-shaped foil (23) (i.e., L1≠L2), and the offset direction and distance are set according to actual needs. In the foil group composed of multiple layers of offset V-shaped foils (23), the offset direction of the upper offset V-shaped beam (231) does not affect the offset direction of the lower offset V-shaped Selection of the offset direction of the beam (231); the C-shaped foil (24) is composed of a C-shaped beam (241) and a connecting beam, the C-shaped beam (241) is an arc or a multi-segment line, and multiple C-shaped beams are distributed along the axial or circumferential direction of the bearing, and the distance between adjacent C-shaped beams is greater than the width of a single C-shaped beam; the cross-shaped foil (25) includes a plurality of I-shaped beams (251) distributed in the circumferential direction and a plurality of single-shaped beams (252) distributed in the axial direction, the two are perpendicular to each other or have an angle, and adjacent two single-shaped beams (252) on different I-shaped connecting beams (251) do not contact; the cross-shaped foil modification 1 is composed of a partial or complete change in the axial distribution to an I-shaped beam modification 1 (262) with different widths and a single-shaped beam modification 1 (261) with different widths distributed in the circumferential direction. The N-shaped foil (54) includes a plurality of circumferentially distributed N-shaped beams (271) or axially distributed N-shaped beam modification 1 (281), the end of the N-shaped beam (271) is coupled to the connecting beam, and the tip of the N-shaped beam modification 1 (281) is coupled to the connecting beam, forming an N-shaped foil modification 1 (28); the H-shaped foil (29) includes a plurality of H-shaped beams (291) distributed along the axial direction of the connecting beam, both ends of the H-shaped beam (291) are coupled to the connecting beam, and the distance between two adjacent H-shaped beams is less than the distance between a single H-shaped beam; the X-shaped foil (30) includes an X-shaped beam (301) and a connecting beam, and the X-shaped beam (301) can be a single one distributed along the axial direction of the connecting beam, or a plurality of X-shaped beams can be coupled together to form a mesh structure.

[0048] refer to Figures 22 to 25The present application can be used as a laminated thrust foil bearing, which is composed of a thrust bearing sleeve (60), a thrust foil group (61), and a thrust top foil (62), wherein the thrust foil group (61) is composed of a thrust first foil (611), a thrust second foil (612), and a thrust third foil (613) stacked in sequence along the bearing axial direction, and the thrust first foil (611), the thrust second foil (612), and the thrust third foil (613) are all obtained by cutting or punching flat foils, and are composed of a thrust foil outer ring (6131), a thrust foil limiting hole (6132), and a thrust foil. The thrust foil V-shaped beam (6133) and the thrust foil inner ring (6134) are composed of the thrust foil V-shaped beam of the first thrust foil (611) to be raised by a certain height compared with the position of the thrust foil outer ring and the thrust foil inner ring, the thrust foil V-shaped beam of the second thrust foil (612) to be recessed by a certain height compared with the position of the thrust foil outer ring and the thrust foil inner ring, the thrust foil V-shaped beam of the third thrust foil (613) has no deformation, and the thrust foil V-shaped beam of the first thrust foil (611) is opposite to the direction of the second thrust foil (612) and opposite to the direction of the third thrust foil The thrust foil V-shaped beam of the second thrust foil (612) is placed above the thrust foil V-shaped beam of the first thrust foil (611) after installation, and the thrust foil V-shaped beams of the two foils form a cross structure. The thrust foil V-shaped beam of the third thrust foil (613) is placed between the two adjacent thrust foil V-shaped beams of the second thrust foil (612) and supports the thrust foil V-shaped beam end of the first thrust foil (611); the thrust top foil (62) is composed of the thrust top foil outer ring (621), the thrust top foil connecting beam (62 2) A thrust top foil support surface (623) and a thrust top foil limiting hole (624) are formed, and the thrust foil group (61) and the thrust top foil (63) are constrained to the thrust bearing sleeve (60) through multiple limiting holes at the radial end, wherein the radial length of the thrust top foil support surface (623) is less than the radial length of the thrust first foil V-shaped beam (6133), and the circumferential end of the thrust top foil support surface (623) is V-shaped, which is the same as the shape of the thrust foil group (61), and its direction is consistent with the rotation direction of the rotor, and is fixed on the surface of the thrust third foil (613).

[0049] refer to Figures 12 to 25 , the thrust top foil only retains the support surface part, and the thrust top foil support surface (623) is fixed on the thrust foil group (61); the V-shaped foil group and its modifications, double V-shaped foil (21), W-shaped foil (22), offset V-shaped foil (23), C-shaped foil (24), cross-shaped foil (25), cross-shaped foil modification 1 (26), N-shaped foil (27), N-shaped foil modification 1 (28), H-shaped foil (29), and X-shaped foil (30) used in radial bearings can all be used in thrust foil bearings.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A laminated foil gas dynamic pressure bearing, characterized in that: The invention comprises a top foil (11), a V-shaped foil group (1) and a bearing sleeve (10); wherein the V-shaped foil group (1) is obtained by cutting and bending a flat foil, and is composed of a first V-shaped foil (13), a second V-shaped foil (14) and a third V-shaped foil (15) radially stacked, the first V-shaped foil (13) being composed of a plurality of first V-shaped foil connecting beams (131) distributed in the circumferential direction and two first V-shaped foil V-shaped beams (132) at the axial end of the foil, the tip of the first V-shaped foil V-shaped beam (132) being oriented in the same direction as the rotation direction of the rotor, and the tip being deformed in the direction of increasing radial direction of the bearing; the second V-shaped foil (14) being composed of a plurality of second V-shaped foil connecting beams (141) distributed in the circumferential direction and two second V-shaped foil V-shaped beams (142) at the axial end of the foil, the second V-shaped foil V-shaped beam (142) and the first V-shaped foil V-shaped beam (132) are in opposite directions, and their tip portions are deformed in the direction of radial reduction of the bearing. The tip portion of the second V-shaped foil V-beam (142) is placed inside the tip portion of the first V-shaped foil V-beam (132) to form a cross structure and change the thickness of the air film in the axial direction of the bearing. The third V-shaped foil (15) is composed of a plurality of third V-shaped foil connecting beams (151) distributed in the circumferential direction and two third V-shaped foil V-beams (152) at the axial ends of the foil. The direction of the third V-shaped foil V-beam (152) is the same as that of the first V-shaped foil V-beam (132) and is placed between two adjacent first V-shaped foil V-beams (132). The top foil is an arc-shaped foil with a V-shaped end. The axial length of the top foil is less than the axial length of the V-beam of the V-shaped foil group. The top foil and the V-shaped foil group are pinned or welded to the inner surface of the bearing sleeve.

2. The laminated foil gas dynamic pressure bearing according to claim 1, characterized in that: The V-shaped foil group (1) is replaced by a V-shaped foil group modification 1 (2), wherein the V-shaped foil group modification 1 (2) is composed of a third V-shaped foil (15), a third V-shaped foil modification 1 (16), and a third V-shaped foil modification 2 (17). The third V-shaped foil (15), the third V-shaped foil modification 1 (16), and the third V-shaped foil modification 2 (17) are all composed of a third V-shaped foil V-shaped beam (152) and a three-V-shaped foil connecting beam (151). The three foils have the same structure but different positions. The third V-shaped foil is a V-shaped foil. The foil modification 2 (17) has the same orientation as the third V-shaped foil (15) and is opposite to the orientation of the third V-shaped foil modification 1 (16). The V-shaped beam of the third V-shaped foil modification 2 (17) is placed between two adjacent V-shaped beams (152) of the third V-shaped foil. The width of the V-shaped beam of the third V-shaped foil modification 2 (17) is less than the distance between the two adjacent V-shaped beams (152) of the third V-shaped foil. The V-shaped beams of the three foils cannot overlap at the same circumferential direction or circumferential position at the same time, ensuring that the V-shaped beam has radial deformation space.

3. The laminated foil gas dynamic pressure bearing according to claim 1, characterized in that: The V-shaped foil group (1) is replaced by a V-shaped foil group modification 2 (3), wherein the V-shaped foil group modification 2 (3) is composed of a third V-shaped foil (15), a third V-shaped foil modification 3 (18), and a third V-shaped foil modification 4 (19). The third V-shaped foil modification 4 (19) is composed of circumferentially distributed foil V-shaped beams (192) and a third V-shaped foil modification 4 connecting beam (191) located in the middle. The third V-shaped foil modification 3 (18) is composed of circumferentially distributed foil V-shaped beams (192). The foil V-shaped beam (192) and the axially distributed third V-shaped foil modification 3 connecting beam (181) are composed, the foil V-shaped beam (192) of the third V-shaped foil modification 4 (19) is oriented opposite to the third V-shaped foil modification 3 (18), and is the same as the third V-shaped foil (15), the foil V-shaped beam (192) of the third V-shaped foil modification 4 (19) is located between two adjacent third V-shaped foil V-shaped beams (152), and the third V-shaped foil modification 4 connecting beam (191) is connected to the third V-shaped foil modification 4 (19). The V-shaped foil modification 3 connecting beam (181) is not in the same axial position, the axial length of the third V-shaped foil modification 3 (18) is the same as that of the third V-shaped foil modification 4 (19), and is smaller than the axial length of the third V-shaped foil (15), and the axial length of the top foil (11) is the same as that of the third V-shaped foil modification 3 (18); the V-shaped foil group (1) is replaced by the V-shaped foil group modification 3 (4), and the V-shaped foil group modification 3 (4) is composed of the third V-shaped foil (15), the third V-shaped foil The invention is composed of a foil modification 3 (18) and a third V-shaped foil modification 4 (19), wherein the foil V-shaped beam (192) of the third V-shaped foil modification 4 (19) is oriented in the same direction as the third V-shaped foil modification 3 (18) and opposite to the third V-shaped foil (15), and the foil V-shaped beam (192) of the third V-shaped foil modification 4 (19) is located between two adjacent foil V-shaped beams of the third V-shaped foil modification 3 (18), and the three foil V-shaped beams cannot overlap at the same circumferential direction or circumferential position.

4. The laminated foil gas dynamic pressure bearing according to claim 1, characterized in that: The V-shaped foil group (1) is replaced by a V-shaped foil group modification 4 (5), which is composed of a third V-shaped foil modification 5 (20), a third V-shaped foil modification 3 (18), and a third V-shaped foil modification 4 (19). The axial lengths of the three foils are such that the third V-shaped foil modification 5 (20) is composed of a circumferentially distributed foil V-shaped beam (192) and an axially distributed third V-shaped foil modification 5 connecting beam (201). The third V-shaped foil modification 3 connecting beam (181) is not in the same axial position as the third V-shaped foil modification 4 connecting beam (191) and the third V-shaped foil modification 5 connecting beam (201).

5. The laminated foil gas dynamic pressure bearing according to claim 1, characterized in that: The foils in the foil group and its modifications can be replaced by double V-shaped foils (21), W-shaped foils (22), offset V-shaped foils (23), C-shaped foils (24), cross-shaped foils (25), cross-shaped foil modification 1 (26), N-shaped foils (27), N-shaped foil modification 1 (28), H-shaped foils (29), and X-shaped foils (30), and their placement direction can be along the axial direction or along the circumferential direction; the beam structures and connecting beam sizes of different foils can be partially or completely changed in length, width, and thickness according to actual needs to achieve axial stiffness changes and circumferential stiffness changes; wherein, the double V-shaped foil (21) includes two V-shaped beams 1 (211) and V-shaped beams 2 (212) with different angles and the same direction. , wherein the V-shaped beam 1 (211) and the V-shaped beam 2 (212) can be placed at any position (middle, end, offset) in the axial direction of the foil; the W-shaped foil (22) comprises a superposition of two V-shaped beams 3 (221) and a V-shaped beam 4 (222) facing in opposite directions, and the angles between the two V-shaped beams can be the same or different; the offset V-shaped foil (23) is composed of an offset V-shaped beam (231) and a connecting beam at the end of the foil, the tip of the offset V-shaped beam (231) is not in the middle of the offset V-shaped foil (23) (i.e., L1≠L2), the offset direction and distance are set according to actual needs, and in a foil group composed of multiple layers of offset V-shaped foils (23), the offset direction of the upper offset V-shaped beam (231) does not affect the offset direction of the lower offset V Selection of the offset direction of the C-shaped beam (231); the C-shaped foil (24) is composed of a C-shaped beam (241) and a connecting beam, the C-shaped beam (241) is an arc or a multi-segment line, and multiple C-shaped beams are distributed along the axial or circumferential direction of the bearing, and the distance between adjacent C-shaped beams is greater than the width of a single C-shaped beam; the cross-shaped foil (25) includes a plurality of I-shaped beams (251) distributed in the circumferential direction and a plurality of single-shaped beams (252) distributed in the axial direction, the two beams are perpendicular to each other or have an angle, and adjacent two single-shaped beams (252) on different I-shaped connecting beams (251) do not contact; the cross-shaped foil modification 1 is changed from partially or completely distributed in the axial direction to an I-shaped beam modification 1 (262) with different widths and a single-shaped beam modification 1 (261) with different widths distributed in the circumferential direction. Composition: The N-shaped foil (54) includes a plurality of circumferentially distributed N-shaped beams (271) or axially distributed N-shaped beam modification 1 (281), the end of the N-shaped beam (271) is coupled to the connecting beam, and the tip of the N-shaped beam modification 1 (281) is coupled to the connecting beam, forming an N-shaped foil modification 1 (28); the H-shaped foil (29) includes a plurality of H-shaped beams (291) distributed along the axial direction of the connecting beam, both ends of the H-shaped beam (291) are coupled to the connecting beam, and the distance between two adjacent H-shaped beams is less than the distance between a single H-shaped beam; the X-shaped foil (30) includes an X-shaped beam (301) and a connecting beam, and the X-shaped beam (301) can be a single one distributed along the axial direction of the connecting beam, or a plurality of X-shaped beams can be coupled together to form a mesh structure.

6. The laminated foil gas dynamic pressure bearing according to claim 1, characterized in that: The present application can be used as a laminated thrust foil bearing, which is composed of a thrust bearing sleeve (60), a thrust foil group (61), and a thrust top foil (62), wherein the thrust foil group (61) is composed of a thrust first foil (611), a thrust second foil (612), and a thrust third foil (613) stacked in sequence along the bearing axial direction, and the thrust first foil (611), the thrust second foil (612), and the thrust third foil (613) are all obtained by cutting or punching flat foils, and are composed of a thrust foil outer ring (6131), a thrust foil limiting hole (6132), and a thrust foil The thrust foil V-shaped beam (6133) is composed of a thrust foil inner circle (6134), the thrust foil V-shaped beam of the first thrust foil (611) is raised by a certain height compared to the position of the thrust foil outer circle and the thrust foil inner circle, the thrust foil V-shaped beam of the second thrust foil (612) is recessed by a certain height compared to the position of the thrust foil outer circle and the thrust foil inner circle, the thrust foil V-shaped beam of the third thrust foil (613) is not deformed, and the thrust foil V-shaped beam of the first thrust foil (611) is opposite to the direction of the second thrust foil (612) and opposite to the direction of the third thrust foil. The thrust foil V-shaped beam end of the thrust second foil (612) after installation is placed above the thrust foil V-shaped beam end of the thrust first foil (611), and the thrust foil V-shaped beams of the two foils form a cross structure. The thrust foil V-shaped beam of the thrust third foil (613) is placed between the two adjacent thrust foil V-shaped beams of the thrust second foil (612) and supports the thrust foil V-shaped beam end of the thrust first foil (611); the thrust top foil (62) is composed of the thrust top foil outer ring (621), the thrust top foil connecting beam (622), and the thrust foil V-shaped beam of the thrust third foil (613). ), a thrust top foil support surface (623), and a thrust top foil limiting hole (624); the thrust foil group (61) and the thrust top foil (63) are constrained to the thrust bearing sleeve (60) through multiple limiting holes at the radial end, wherein the radial length of the thrust top foil support surface (623) is less than the radial length of the thrust first foil V-shaped beam (6133); the circumferential end of the thrust top foil support surface (623) is V-shaped, which is the same shape as the thrust foil group (61), and its direction is consistent with the rotation direction of the rotor, and is fixed on the surface of the thrust third foil (613).

7. The fence-shaped foil gas dynamic pressure bearing according to claim 1 and claim 8, characterized in that: The thrust top foil only retains the supporting surface portion, and the thrust top foil supporting surface (623) is fixed on the thrust foil group (61); the V-shaped foil group and its modifications, double V-shaped foil (21), W-shaped foil (22), offset V-shaped foil (23), C-shaped foil (24), cross-shaped foil (25), cross-shaped foil modification 1 (26), N-shaped foil (27), N-shaped foil modification 1 (28), H-shaped foil (29), and X-shaped foil (30) used in radial bearings can all be used in thrust foil bearings.

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