A porous tilting pad gas bearing based on an electromagnetic damper

Abstract

This invention discloses a porous tilting pad gas bearing based on an electromagnetic damper, mainly composed of a bearing base, an electromagnetic damper, tilting pads, and a porous material. The tilting pads and the bearing base form a concentric ring structure. An electromagnetic damper is installed between the bearing base and the tilting pads. An external air inlet is provided on the outer end face of the tilting pad along the axial direction. A pressure equalization groove structure is provided on the side of the tilting pad away from the bearing base. The porous material is installed in the pressure equalization groove, and a porous material air supply hole connected to the external air inlet is provided at the bottom of the pressure equalization groove. This invention belongs to the field of air bearing technology. By using the porous material, direct contact between the inner surface of the bearing and the outer surface of the shaft diameter can be avoided. By using the electromagnetic damper, the overall damping of the bearing can be improved and a completely oil-free working environment can be achieved.

Description

[0001] Technical Field: This invention relates to the field of air bearing technology, specifically providing a porous tilting pad gas bearing based on an electromagnetic damper.

[0002] Technical Background: Porous tilting pad gas bearings are hybrid gas bearings where porous materials are bonded to the metal surface of tilting pads. They combine the advantages of porous hydrostatic gas bearings with the stability of tilting pad bearings, exhibiting excellent characteristics in terms of load capacity, damping, and stiffness. Furthermore, they are characterized by being pollution-free, having low wear, and capable of high speeds, leading to their increasing application in high-speed rotating machinery such as turboexpanders. In porous tilting pad gas bearings, when the rotor is not rotating, externally pressurized gas enters the bearing housing through an external inlet. After flowing out of the porous material, it forms a gas film between the bearing and the rotor, supporting the rotor system and achieving contactless suspension between them. The bearing essentially functions as a hydrostatic gas bearing, with the porous material acting as a gas throttle. When the rotor rotates without external pressurized gas, the lubricating gas forms a gas film due to the dynamic pressure effect, supporting the rotor system. In this case, the bearing functions as a hydrodynamic gas bearing. When an external air source and an external force driving the rotor are provided simultaneously, the dynamic pressure effect generated by the rotor rotation and the static pressure effect generated by the external gas act together on the gas film layer. When the rotor is running at high speed, the gas leakage rate of the gas film layer increases, which reduces the damping of the bearing. This leads to poor operating stability of the entire bearing-rotor system.

[0003] To effectively improve bearing damping, a common and effective measure currently adopted is to install a squeeze film damper on the bearing, such as a squeeze film damper bearing and rotating machinery equipped with such a squeeze film damper (CN 111623036 A). This application discloses a squeeze film damper bearing and rotating machinery equipped with such a squeeze film damper. The squeeze film damper bearing has: an inner support ring supporting the bearing portion; an outer support ring disposed on the outer periphery of the inner support ring; and a venting portion disposed on at least one of the outer support ring and the inner support ring. The damper gap formed between the outer peripheral surface of the inner support ring and the inner peripheral surface of the outer support ring is filled with a viscous fluid. However, the squeeze film damper still suffers from internal hydraulic oil leakage during operation, leading to environmental pollution. To solve the above problem, this invention proposes a porous tilting pad gas bearing based on an electromagnetic damper. Summary of the Invention:

[0004] The purpose of this invention is to solve the above-mentioned problems and propose a porous tilting pad gas bearing based on an electromagnetic damper. By adding an electromagnetic damper to the porous tilting pad gas bearing, the damping of the bearing is improved while achieving the goal of no environmental pollution.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A porous tilting pad gas bearing based on an electromagnetic damper includes a bearing base, an electromagnetic damper, tilting pads, and a porous material. The tilting pads and the bearing base form a concentric annular structure. An electromagnetic damper is installed between the bearing base and the tilting pads. An external air inlet is provided on the outer end face of the tilting pads along the axial direction. A pressure equalization groove structure is provided on the side of the tilting pads away from the bearing base. The porous material is installed in the pressure equalization groove. A porous material air supply hole connected to the external air inlet is provided at the bottom of the pressure equalization groove.

[0007] Preferably, there are four tiltable tiles, which are arranged at equal intervals along the circumference.

[0008] Preferably, the tiltable tile has an external air inlet on its outer end face along the axial direction, and the external air inlet is connected to the porous air supply hole space at a 90° angle.

[0009] Preferably, any of the electromagnetic dampers contains two electromagnetic damping components, each comprising a primary part and a secondary part. The primary part is mounted on the side of the upper plate away from the tiltable tile via a connecting rod, and the secondary part is mounted on the side of the lower plate away from the bearing base. The upper and lower plates are connected by a spring.

[0010] Preferably, there is an air gap between the primary and secondary parts of the electromagnetic damping component.

[0011] Preferably, the secondary part of the electromagnetic damping component includes a magnetic cylinder and a conductive cylinder, wherein the magnetic cylinder is made of pure iron and the conductive cylinder is made of pure copper.

[0012] Preferably, the connecting rod of the primary part of the electromagnetic damping assembly is surrounded by annular magnets and annular magnetic shoes. There are four annular magnets, which are installed on the connecting rod in a manner where they are installed with the same pole facing each other. There are five annular magnetic shoes, which are installed at both ends of the annular magnets and between the annular magnets.

[0013] Preferably, the electromagnetic damper has a modular structure, with two electromagnetic dampers installed between any bearing base and the tilting tile.

[0014] Preferably, the porous material is a graphite porous medium, and the porous material is bonded to the side of the pressure equalization groove by a filler adhesive.

[0015] Compared with existing technologies, the present invention has the following advantages: By introducing an electromagnetic damper to replace the previous extrusion oil film damper, the present invention can achieve a completely oil-free working environment while improving the overall damping of the porous tilting pad gas bearing, thus avoiding environmental pollution; the electromagnetic damper of the present invention has a modular structure, which is convenient for installation and debugging; the present invention improves static pressure performance by adjusting the gas pressure at the porous material by connecting the external air inlet and the porous material air supply port at a 90° angle. Attached image description:

[0016] Figure 1 This is a three-dimensional view of the overall structure of the present invention.

[0017] Figure 2 This is a front view of the overall structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the tiltable tile structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the porous material of the present invention.

[0020] Figure 5 This is a schematic diagram of the electromagnetic damper structure of the present invention.

[0021] Figure 6 for Figure 5 Sectional view of AA.

[0022] Figure 7 This is a cross-sectional view of the electromagnetic damping component of the present invention and its BB section.

[0023] Labels in the diagram: 1. Bearing base; 2. Electromagnetic damper; 3. Tilting tile; 4. Porous material; 5. Equalizing groove; 6. Porous air supply hole; 7. External air inlet; 8. Upper plate; 9. Primary part; 10. Spring; 11. Secondary part; 12. Lower plate; 13. Electromagnetic damping assembly; 14. Connecting rod; 15. Annular magnetic shoe; 16. Annular magnet; 17. Conductive cylinder; 18. Magnetic cylinder. Detailed implementation method:

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1 to 7This invention provides a porous tilting pad gas bearing based on an electromagnetic damper: A porous tilting pad gas bearing based on an electromagnetic damper includes a bearing base 1, an electromagnetic damper 2, tilting pads 3, and a porous material 4. The tilting pads 3 and the bearing base 1 form a concentric annular structure. Two electromagnetic dampers 2 are installed between each bearing base 1 and the tilting pad 3. Each electromagnetic damper 2 contains two electromagnetic damping components 13. The electromagnetic damping components 13 include a primary part 9 and a secondary part 11. The primary part 9 is installed on the side of the upper plate 8 away from the tilting pad 3 via a connecting rod 14. The secondary part 11 is installed on the side of the lower plate 12 away from the bearing base 1. The upper plate 8 and the lower plate 12 are connected by a spring 10. When vibration is transmitted to the electromagnetic damper 3 via the tilting tile 2, the spring 10 on the electromagnetic damper 3 deforms, and the primary part 9 of the electromagnetic damping assembly 13 moves. The primary part 9 and the secondary part 11 generate electromagnetic resistance due to their relative motion, thus producing greater damping and achieving vibration reduction. Each tilting tile 3 has an external air inlet 7 on its outer end face along the axial direction. Each tilting tile 3 has a pressure equalization groove 5 structure on the side away from the bearing base 1. A porous material 4 is installed in each pressure equalization groove 5, and a porous material air supply hole 6 connected to the external air inlet 7 is provided at the bottom of each pressure equalization groove 5.

[0026] In this embodiment, there are multiple tiltable tiles 3, preferably four, and the tiltable tiles 3 are arranged at equal intervals along the circumference.

[0027] In this embodiment, the tiltable tile 3 has an external air inlet 7 on its outer end face along the axial direction. The external air inlet 7 is spatially connected to the porous material air supply hole 6 at a 90° angle. When the rotor is not rotating, the gas pressure at the porous material is adjusted by adjusting the gas pressure at the external air inlet 7, thereby improving its static pressure performance.

[0028] In this embodiment, there is an air gap between the primary part 9 and the secondary part 11 of the electromagnetic damping component 13, which facilitates the relative movement of the primary part 9 and the secondary part 11 and the generation of electromagnetic damping.

[0029] In this embodiment, the secondary portion 11 of the electromagnetic damping assembly 13 includes a magnetically conductive cylinder 18 and a conductive cylinder 17. The magnetically conductive cylinder 18 is made of a magnetically conductive material, preferably pure iron, and the conductive cylinder 17 is made of a conductive material, preferably pure copper. The connecting rod 14 of the primary portion 9 of the electromagnetic damping assembly 13 is surrounded by annular magnets 16 and annular magnetic shoes 15. There are multiple annular magnets 16, preferably four, and the material of the annular magnets 16 is preferably permanent magnets. The annular magnets 16 are mounted on the connecting rod 14 with their poles facing each other. There are preferably five annular magnetic shoes 15, and the material of the annular magnetic shoes 15 is preferably pure iron. In this embodiment, the electromagnetic damper 2 has a modular structure, which facilitates installation and debugging.

[0030] In this embodiment, the porous material 4 is preferably a graphite porous medium, and the porous material 4 is bonded to the side of the pressure equalization groove 5 by a filler adhesive, which facilitates the installation and fixation of the porous material 4.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, or variations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A porous tilting pad gas bearing based on an electromagnetic damper, characterized in that, The system includes a bearing base (1), an electromagnetic damper (2), a tilting tile (3), and a porous material (4). The tilting tile (3) and the bearing base (1) form a concentric ring structure. An electromagnetic damper (2) is installed between the bearing base (1) and the tilting tile (3). An external air inlet (7) is provided on the outer end face of the tilting tile (3) along the axial direction. A pressure equalization groove (5) structure is provided on the side of the tilting tile (3) away from the bearing base (1). A porous material (4) is installed in the pressure equalization groove (5). A porous material air supply hole (6) connected to the external air inlet (7) is provided at the bottom of the pressure equalization groove (5). Any of the electromagnetic dampers (2) There are two electromagnetic damping components (13) inside. The electromagnetic damping component (13) includes a primary part (9) and a secondary part (11). The primary part (9) is installed on the side of the upper plate (8) away from the tiltable tile (3) by a connecting rod (14). The secondary part (11) is installed on the side of the lower plate (12) away from the bearing base (1). The upper plate (8) and the lower plate (12) are connected by a spring (10). There is an air gap between the primary part (9) and the secondary part (11) of the electromagnetic damping component (13). The secondary part (11) of the electromagnetic damping component (13) includes a magnetic cylinder (18) and a conductive cylinder (17).

2. The porous tilting pad gas bearing based on an electromagnetic damper according to claim 1, characterized in that, There are 4 tiltable tiles (3), which are arranged at equal intervals along the circumference.

3. The porous tilting pad gas bearing based on an electromagnetic damper according to claim 1, characterized in that, The tiltable tile (3) has an external air inlet (7) on its outer end face along the axial direction. The external air inlet (7) is connected to the porous air supply hole (6) at a 90° spatial intersection.

4. A porous tilting pad gas bearing based on an electromagnetic damper according to claim 1, characterized in that, The magnetic tube (18) is made of pure iron, and the conductive tube (17) is made of pure copper.

5. A porous tilting pad gas bearing based on an electromagnetic damper according to claim 1, characterized in that, The connecting rod (14) of the primary part (9) of the electromagnetic damping assembly (13) is surrounded by annular magnets (16) and annular magnetic shoes (15). There are four annular magnets (16), which are installed on the connecting rod (14) with the same pole facing each other. There are five annular magnetic shoes (15), which are installed at both ends of the annular magnets (16) and between the annular magnets (16).

6. A porous tilting pad gas bearing based on an electromagnetic damper according to claim 1, characterized in that, The electromagnetic damper (2) is a modular structure, with two electromagnetic dampers (2) installed between any bearing base (1) and tiltable tile (3).

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