A high damping tilting pad bearing

Abstract

The present application relates to the technical field of gas bearings, and provides a novel high-damping tilting pad bearing, comprising: a bearing sleeve, a magnet, a porous tile, an air supply valve, and a sealing screw; the bearing sleeve comprises a tilting pad supporting cross beam, a tilting pad supporting vertical beam, a tilting pad, a threaded hole, a ventilation groove, a tilting pad damping beam, and a connecting beam; wherein the tilting pad damping beam distributed in the axial direction of the bearing is connected to the tilting pad through the connecting beam, the magnet is fixed on the bearing sleeve and is spaced a certain distance from the tilting pad damping beam, when the tilting pad vibrates, it will drive the tilting pad damping beam to vibrate, and then cut the magnetic flux lines emitted by the magnet to generate eddy currents, forming an energy dissipation effect; a number of tilting pads are distributed circumferentially on the bearing sleeve, a porous tile is fixed on the upper surface of the tilting pad, a number of ventilation grooves are distributed axially and circumferentially on the upper surface of the tilting pad, a threaded hole is opened at the end of the tilting pad and at a position consistent with the axial direction of the ventilation groove, the threaded hole is connected to the air groove, and the static pressure gas is ventilated to the porous tile through the air supply valve, the threaded hole, and the ventilation groove. The present application provides nonlinear high damping for a tilting pad bearing by using a tilting pad damping beam with a large circumferential area of ​​the bearing to generate eddy current energy dissipation, and the distributed ventilation grooves provide uniform air supply pressure to improve bearing stability.

Description

Technical Field

[0001] The invention relates to the technical field of gas dynamic pressure bearings, and in particular to a novel high-damping tilting pad bearing. Background Art

[0002] The tilting pad gas dynamic pressure bearing is a bearing in which the tilting pads swing adaptively with the movement of the rotor. The multiple circumferential tilting pads can weaken the continuity of the air film and the swinging tilting pads can weaken the cross stiffness of the gas dynamic pressure bearing, providing good stability for the rotor. It is widely used in high-speed equipment such as air cycle machines, fuel cell air compressors, and air refrigerators. However, when the rotor is in a high-speed working state, the stiffness of the tilting pad support limits the swing of the tilting pad, resulting in the inability of the swing of the tilting pad to completely eliminate the cross stiffness of the bearing. Moreover, the tilting pad and the bearing sleeve are an integrated structure with insufficient damping performance, and the subsynchronous vibration of the system cannot be completely suppressed. The tilting pad surface that weakens the continuity of the air film cannot fully accommodate the compressed gas, reducing the bearing capacity of the bearing. Although CN202310164322.9 uses the cutting action of the magnet and the support to produce a damping effect, the damping of the invention is limited by the size of the support, and the damping effect produced is limited. Summary of the invention

[0003] In view of the above technical deficiencies, the present application provides a novel high-damping tilting pad bearing, which uses a tilting pad damping beam with a large circumferential length and a magnet to generate eddy current energy dissipation, thereby solving the technical problem of low damping of the existing tilting pad bearing system. The preferred technical solution among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0004] To achieve the above technical objectives, the present invention provides the following technical solutions: a new type of high-damping tilting pad bearing, including a bearing sleeve, a magnet, a porous pad, an air supply valve, and a sealing screw.

[0005] Furthermore, the bearing sleeve is composed of a tilting pad support cross beam, a tilting pad support vertical beam, a tilting pad block, a threaded hole, a venting groove, a tilting pad damping beam, and a connecting beam. The tilting pad damping beam is obtained by machining or other processing methods, so that the tilting pad damping beam is distributed along the axial direction, the circumferential direction of the tilting pad damping beam is not in contact with the bearing sleeve, and the circumferential length is greater than the length of the tilting pad support vertical beam. The structure of the tilting pad support vertical beam, the tilting pad block and the connecting beam is obtained by wire cutting or other processing methods, and the tilting pad damping beam is connected to the tilting pad only through the connecting beam.

[0006] Furthermore, the tilting pad damping beam distributed in the axial direction of the bearing is connected to the tilting pad through a connecting beam, and the magnet is fixed on the bearing sleeve and is spaced a certain distance from the tilting pad damping beam. During the operation of the bearing, the time-varying high-pressure air film will cause the tilting pad to vibrate, and then drive the tilting pad damping beam to vibrate through the connecting beam. The tilting pad damping beam cuts the magnetic flux lines emitted by the magnet to generate eddy currents, forming an energy dissipation effect, and slowing down the vibration amplitude of the tilting pad damping beam. A number of tilting pads are distributed circumferentially on the bearing sleeve, and porous pads are fixed on the upper surface of the tilting pads. A number of ventilation grooves are distributed axially and circumferentially on the upper surface of the tilting pads. A threaded hole is opened at the end of the tilting pad and at a position consistent with the axial direction of the ventilation groove. The threaded hole is connected to the air groove, and the static pressure gas is ventilated to the porous pads through the air supply valve, the threaded hole, and the ventilation groove.

[0007] Furthermore, machining and other processing methods are used to obtain the tilting pad supporting crossbeam, ventilation grooves and threaded holes, wherein the tilting pad supporting crossbeam is perpendicular to the tilting pad supporting vertical beam, the ventilation grooves are distributed in a grid shape to make the static pressure gas evenly distributed, the threaded holes are distributed along the circumferential direction and are consistent with the axial direction of the ventilation grooves, and the threaded holes are only at the ends of the ventilation grooves. The threaded holes do not damage the upper surface of the tilting pad block, and the porous pad block fits with the upper surface of the tilting pad block to ensure sealing.

[0008] Furthermore, the air supply valve is connected to the threaded hole on the tilting pad, and a plurality of air supply valves can be distributed on each tilting pad, and the remaining threaded holes are sealed with sealing screws to prevent air leakage.

[0009] Furthermore, the function of the magnet is to generate magnetic flux lines, and other forms of other electrically controlled magnetic fields may be used to replace the magnet, so that the magnitude of damping can be controlled online, such as coils and iron cores.

[0010] Furthermore, elastic structures such as foil and top foil can be used on the upper surface of the tilting pad to replace the tilting pad. The foil and the top foil are fixed on the tilting pad, wherein the foil is composed of several "ZS" shaped structures, and the head and tail "ZS" shaped structures are nested together, and the top foil is composed of a "triangle" support and an arc surface. The shape of the "triangle" support is similar to the "ZS" shaped structure and is nested in the "ZS" shaped structure, thereby avoiding the inconsistent circumferential stiffness of the bearing caused by the fixing method of the top foil, and the nesting method of the top foil can realize bidirectional rotation of the rotor.

[0011] Further, the upper surface of the tilting pad may be in the form of a porous pad or a top foil and a foil sheet, and may also be installed on the lower surface of the tilting pad to change the bearing performance.

[0012] Due to the adoption of the above technology, the present invention has the following positive effects compared with the prior art: the present invention makes full use of the circumferential and axial lengths of the bearing to obtain a plurality of axially distributed tilting pad damping beams with a larger circumferential length, and drives the tilting pad damping beams with the vibration of the tilting pads, so that the tilting pad damping beams cut the magnetic flux lines emitted by the magnets to generate greater eddy current energy consumption; the grid-shaped distribution of ventilation grooves connects the threaded holes and the air valves to provide uniform air supply pressure and sealing for the porous pads, thereby improving the bearing capacity of the bearings and realizing bidirectional rotation of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 An exploded view of a novel high-damping tilting pad bearing provided in an embodiment of the present invention.

[0015] Figure 2 A front view and a side view of a novel high-damping tilting pad bearing provided in an embodiment of the present invention.

[0016] Figure 3 A bearing sleeve and a partial enlarged view of a novel high-damping tilting pad bearing provided in an embodiment of the present invention.

[0017] Figure 4 A cross-sectional view of a novel high-damping tilting pad bearing provided in an embodiment of the present invention.

[0018] Figure 5 An exploded diagram of the elastic structure of a novel high-damping tilting pad bearing provided in an embodiment of the present invention.

[0019] Figure 6 A partial enlarged view of the elastic structure of a novel high-damping tilting pad bearing provided by an embodiment of the present invention. The marks of the figures in the figure are: 1-bearing sleeve, 2-magnet, 3-porous tile, 4-air supply valve, 5-sealing screw, 6-foil, 7-top foil, 11-tilt pad support beam, 12-tilt pad support beam, 13-tilt pad, 14 threaded hole, 15 ventilation groove, 16-tilt pad damping beam, 17-connecting beam, 18-through groove, 61-"ZS" shape structure, 71-"triangle" support, 72-arc surface. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise specified, “several” means two or more than two; the directions or positional relationships indicated by the terms “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0022] The foil gas bearing provided in the embodiment of the present application is now described.

[0023] Please refer to Figures 1 to 6 As shown, a new type of high-damping tilting pad bearing is shown, which is composed of a bearing sleeve 1, a magnet 2, a porous tile 3, an air supply valve 4, and a sealing screw 5.

[0024] The bearing sleeve comprises a tilting pad supporting cross beam 11 , a tilting pad supporting vertical beam 12 , a tilting pad block 13 , a threaded hole 14 , a venting groove 15 , a tilting pad damping beam 16 , and a connecting beam 17 .

[0025] The tilting pad damping beam 16 is obtained by machining or other processing methods, so that the tilting pad damping beam 16 is distributed along the axial direction, the tilting pad damping beam 16 does not contact the bearing sleeve in the circumferential direction, and the circumferential length is slightly greater than the length of the tilting pad support vertical beam 12; the structure of the tilting pad support vertical beam 12, the tilting pad block 13 and the connecting beam 17 is obtained by wire cutting or other processing methods, and the connecting beam 17 can be processed by the tilting pad support vertical beam 12 or not. The tilting pad damping beam 16 is connected to the tilting pad block 13 only through the connecting beam 17, and the other circumferential positions of the tilting pad damping beam 16 are separated from the tilting pad block 13 due to wire cutting or other processing methods. The tilting pad damping beam 16 distributed in the axial direction of the bearing is connected to the tilting pad block 13 through the connecting beam 17, and the magnet 2 is fixed on the bearing sleeve 1 and is spaced a certain distance from the tilting pad damping beam 16. During the operation of the bearing, the time-varying high-pressure air film causes the tilting pad 13 to vibrate, which in turn drives the tilting pad damping beam 16 to vibrate, thereby cutting the magnetic flux lines emitted by the magnet 2 to generate eddy currents, forming an energy dissipation effect. Multiple axially distributed and circumferentially larger tilting pad damping beams 16 can provide obvious damping effect.

[0026] The tilting pad support beam 11, the vent groove 15, and the threaded hole 14 are obtained by machining and the multiple grooves obtained when machining the tilting pad damping beam 16 make the tilting pad damping beam 16 have a certain distance from the end of the bearing sleeve, and the machined tilting pad support beam 11 will not affect the structure of the tilting pad damping beam 16. The tilting pad support beam 11 is perpendicular to the tilting pad support vertical beam 12, the arc-shaped vent grooves 15 are distributed in a grid shape to make the static pressure gas evenly distributed, the threaded hole 14 is distributed along the circumferential direction and is consistent with the axial direction of the vent groove 15, and the threaded hole 14 only has the end thereof in contact with the vent groove 15, and the threaded hole 14 does not damage the upper surface of the tilting pad block 13, and the porous pad block 3 is in contact with the upper surface of the tilting pad block 13 to ensure sealing.

[0027] The bearing sleeve 1 has a plurality of tilting pads 13 distributed circumferentially, a porous pad 3 is fixed on the upper surface of the tilting pad 13, a plurality of ventilation grooves 15 are distributed axially and circumferentially on the upper surface of the tilting pad 13, a threaded hole 14 is opened at the end of the tilting pad 13 and at a position consistent with the axial direction of the ventilation groove 15, the threaded hole 14 is connected to the air groove 15, and the static pressure gas is ventilated to the porous pad 13 through the air supply valve 4, the threaded hole 14 and the ventilation groove 15.

[0028] The air supply valve 4 is connected to the threaded hole 14 on the tilting pad 13. A plurality of air supply valves 4 can be distributed on each tilting pad 13, and the remaining threaded holes 14 are sealed with sealing screws 5 to prevent air leakage.

[0029] As an optional implementation, the function of the magnet 2 is to generate magnetic flux lines. Other forms of other electrically controlled magnetic fields can be used to replace the magnet, so as to achieve the effect of online control of the size of the damping, such as coils and iron cores.

[0030] As an optional implementation, the upper surface of the tilting pad 13 can be replaced by an elastic structure such as a foil 6 and a top foil 7, and the foil 6 and the top foil 7 are fixed on the tilting pad 13, wherein the foil 6 is composed of a plurality of "ZS" shaped structures 61, and the head and tail "ZS" shaped structures 61 are nested together, and the top foil 7 is composed of a "triangle" support 71 and an arc-shaped surface 72. The shape of the "triangle" support 71 is similar to that of the "ZS" shaped structure 61, and is nested in the "ZS" shaped structure 61, thereby avoiding the situation in which the circumferential stiffness of the bearing is obviously inconsistent due to the fixing method of the top foil, and the nesting method of the top foil can realize bidirectional rotation of the rotor.

[0031] As an optional embodiment, the upper surface of the tilting pad 13 may be in the form of a porous pad 3 or a top foil 7 and a foil 6, or may be installed on the lower surface of the tilting pad 13 to change the bearing performance.

[0032] The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, modification, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high damping tilting pad bearing, It is characterized in that include: A bearing sleeve (1), a magnet (2), a porous tile (3), an air supply valve (4), and a sealing screw (5), wherein the bearing sleeve comprises a tilting pad support cross beam (11), a tilting pad support vertical beam (12), a tilting pad block (13), a threaded hole (14), a venting groove (15), a tilting pad damping beam (16), and a connecting beam (17); wherein the tilting pad block (13) is connected to the bearing sleeve base body by the tilting pad support cross beam (11) and the tilting pad support vertical beam (12); the tilting pad damping beam (16) distributed in the axial direction of the bearing is connected to the tilting pad block (13) only by the connecting beam (17); the magnet (2) The magnet (2) is fixed on the bearing sleeve (1), distributed along the circumference of the bearing, and arranged axially between two adjacent tilting pad damping beams (16) and between the tilting pad damping beam (16) and the end of the bearing sleeve, and the magnet (2) is spaced a certain distance from the tilting pad damping beam (16); a plurality of tilting pads (13) are distributed circumferentially on the bearing sleeve (1), the porous pads (3) are fixed on the upper surface of the tilting pads (13), a plurality of ventilation grooves (15) are distributed axially and circumferentially on the upper surface of the tilting pads (13), and a plurality of ventilation grooves (15) are opened at the end of the tilting pads (13) and at a position consistent with the axial direction of the ventilation grooves (15). The threaded hole (14) is connected to the ventilation groove (15), and the static pressure gas is ventilated to the porous pad block (3) through the air supply valve (4), the threaded hole (14), and the ventilation groove (15); the tilting pad damping beam (16) is obtained by machining, so that the tilting pad damping beam (16) is distributed along the axial direction, the circumferential direction of the tilting pad damping beam (16) is not in contact with the bearing sleeve, and the circumferential length is greater than the length of the tilting pad support vertical beam (12); the structure of the tilting pad support vertical beam (12), the tilting pad block (13) and the connecting beam (17) is obtained by wire cutting; The tilting pad support cross beam (11), the ventilation groove (15), and the threaded hole (14) are obtained by machining, wherein the tilting pad support cross beam (11) is perpendicular to the tilting pad support vertical beam (12), the ventilation groove (15) is distributed in a grid shape to make the static pressure gas evenly distributed, the threaded hole (14) is distributed along the circumferential direction and is consistent with the axial direction of the ventilation groove (15), the threaded hole (14) does not damage the upper surface of the tilting pad block (13), the porous pad block (3) is fitted with the upper surface of the tilting pad block (13) to ensure sealing, and the magnet (2) is fixed to the bearing sleeve (1) by gluing;During the operation of the bearing, the time-varying high-pressure air film will cause the tilting pad (13) to vibrate. Subsequently, the tilting pad damping beam (16) is driven to vibrate through the connecting beam (17). The tilting pad damping beam (16) cuts the magnetic induction lines emitted by the magnet (2) to generate eddy currents, forming an energy-consuming effect and reducing the vibration amplitude of the tilting pad damping beam (16). The air supply valve (4) is connected to the threaded hole (14) on the tilting pad (13). Multiple air supply valves (4) can be distributed on each tilting pad (13), and the remaining threaded holes (14) are sealed with the sealing screws (5) to prevent air leakage.

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