An air-suspended radial bearing and a hydrogen energy compressor

Abstract

The present invention relates to the field of air suspension bearings, and particularly to an air suspension radial bearing and a hydrogen energy compressor. The bearing comprises a bearing housing, a wave foil, a middle foil, a top foil and a locking screw; the bearing housing is provided with a bearing hole, a fixing groove and a screw hole; the wave foil is fixedly sleeved on the outer wall of the middle foil, the middle foil is sleeved on the outer wall of the top foil, and the outer wall of the wave foil is embedded in the bearing hole; the middle foil and the top foil are both provided with fixing parts protruding from their respective outer walls on one side of their respective open ends, the fixing part of the middle foil and the fixing part of the top foil both pass through the open end of the wave foil and are in contact with each other; the fixing part of the middle foil and the fixing part of the top foil are both fitted in the fixing groove, the locking screw is screwed into the screw hole, and its top end contacts the bottom surface of the fixing part of the middle foil to press the fixing parts of the middle foil and the top foil in the fixing groove. This bearing reduces the number of parts to be replaced and lowers the maintenance cost.

Description

Technical Field

[0001] The present invention relates to the field of air suspension bearings, and particularly to an air suspension radial bearing and a hydrogen energy compressor. Background Art

[0002] An aerodynamic bearing is a type of sliding bearing. Its structure and working principle are similar to those of a liquid sliding bearing, except that gas (mostly air) is used as the lubricating medium. Due to its many advantages such as extremely low friction, a wide applicable speed range, a wide applicable temperature range, and low load-bearing capacity, it can be used in high-speed machines, instruments, or radioactive devices.

[0003] The Chinese utility model patent application (publication number CN212672222U, publication date: 20210309) discloses a foil bearing, including a sleeve, a wave foil, and a top foil; one end of the top foil is connected to the inner side wall of the bearing sleeve, the other end of the top foil extends along the inner side wall of the bearing sleeve, and the two ends of the top foil are butted to form a ring structure; the wave foil is made of soft rubber, the wave foil is located between the bearing sleeve and the top foil, and the side of the wave foil close to the bearing sleeve is attached to the inner side wall of the bearing sleeve. The wave foil in this foil bearing is made of soft rubber, its precision is easy to control, and the adjustment of the parameters of the wave foil is also more convenient, making the production and manufacturing of the wave foil simpler. In addition, the wave foil made of this soft rubber has a larger damping coefficient, making the impact resistance of this foil bearing better, so that the foil bearing runs more smoothly, and the applicable range of this foil bearing is wider.

[0004] The prior art has the following deficiencies: The wave foil is welded to the bearing seat by welding to fix the wave foil, the middle foil, and the top foil. When a failure occurs in the wave foil, the middle foil, or the top foil, the bearing seat needs to be replaced simultaneously; thus increasing the number of parts to be replaced and raising the maintenance cost. Summary of the Invention

[0005] The object of the present invention is: In view of the above problems, to propose an air suspension radial bearing and a hydrogen energy compressor that use locking screws to fix the assembly of the wave foil, the middle foil, and the top foil on the bearing seat. When a failure occurs in the wave foil, the middle foil, or the top foil, only the assembly of the wave foil, the middle foil, and the top foil needs to be disassembled without the need to replace the bearing seat; thus reducing the number of parts to be replaced and lowering the maintenance cost.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An air suspension radial bearing, which comprises a bearing housing, a wave foil, a middle foil, a top foil and a locking screw; the bearing housing is provided with a bearing hole, a fixing groove and a screw hole, and the wave foil, the middle foil and the top foil are all in the shape of an open ring; the wave foil is fixedly sleeved on the outer wall of the middle foil, the middle foil is sleeved on the outer wall of the top foil, and the outer wall of the wave foil is embedded in the bearing hole; the middle foil and the top foil are both provided with fixing parts protruding from their respective outer walls on one side of their respective open ends, the fixing part of the middle foil and the fixing part of the top foil both pass through the open end of the wave foil and are mutually attached; the fixing part of the middle foil and the fixing part of the top foil are both fitted in the fixing groove, the locking screw is screwed into the screw hole, and its top end contacts the bottom surface of the fixing part of the middle foil to press the fixing parts of the middle foil and the top foil in the fixing groove.

[0008] Preferably, the pressing and fixing direction of the locking screw is the same as the rotation direction of the inner rotating shaft supported by the air suspension radial bearing.

[0009] Preferably, a plurality of temperature sensors are fixedly arranged on the end face of the bearing housing, and the temperature sensors are used to detect the surface temperature of the air suspension radial bearing.

[0010] Preferably, the wave foil is provided with a plurality of connecting parts, and the plurality of connecting parts connect multiple sections of the wave foil into a single-piece integral wave foil.

[0011] Preferably, a polytetrafluoroethylene coating is provided on the inner surface of the top foil.

[0012] Preferably, the wave foil and the middle foil are fixedly connected by laser welding.

[0013] In addition, the present invention also discloses a hydrogen energy compressor, which comprises a motor cylinder, a motor stator, a motor shaft, an air suspension radial bearing, an air suspension axial bearing and a thrust disk; the motor stator is fixedly embedded in the motor cylinder, the motor shaft is provided with a motor rotor, and the motor rotor is aligned with the motor stator; two air suspension radial bearings are sleeved at both ends of the motor shaft and are used to provide radial support and limit for the motor shaft; the thrust disk is fixedly sleeved on the motor shaft, and the supporting parts of the air suspension axial bearing are located on both sides of the thrust disk and are used to axially limit the thrust disk.

[0014] Preferably, the air suspension axial bearing comprises a first fixing plate, a second fixing plate, a supporting device and a positioning pin; two supporting devices are arranged oppositely and are respectively located on the oppositely arranged first fixing plate and second fixing plate; the supporting device comprises a bottom foil, an axial wave foil and an axial top foil, the axial wave foil is axially located between the bottom foil and the axial top foil and the three are fixedly connected; oppositely arranged pin holes are provided on the first fixing plate and the second fixing plate, and a plurality of pin slots axially penetrating and aligned with the pin holes are provided on the bottom foil; the positioning pin passes through the pin slots of the two supporting devices, and its two ends are respectively embedded in the pin holes on the first fixing plate and the second fixing plate.

[0015] Preferably, the pin slots are open slots. The four pin slots are arranged in pairs opposite to each other, and the connecting lines of the pin slots arranged in pairs opposite to each other are perpendicular to each other.

[0016] The advantages of the air suspension radial bearing and the hydrogen energy compressor of the present invention adopting the above technical solutions are:

[0017] The combination of the wave foil, the middle foil and the top foil is pressed in the fixed slot by the top of the locking screw. When the wave foil, the middle foil or the top foil is damaged and needs to be replaced, only the locking screw needs to be removed to disassemble the combination of the wave foil, the middle foil and the top foil, without the need to replace the bearing housing; thus reducing the number of parts to be replaced and lowering the maintenance cost of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention.

[0019] Figure 2 is a schematic structural diagram of the wave foil, the middle foil and the top foil.

[0020] Figure 3 is a schematic structural diagram of the wave foil.

[0021] Figure 4 is a schematic structural diagram of the hydrogen energy compressor.

[0022] Figure 5 is a schematic structural diagram of the air suspension axial bearing.

[0023] Figure 6 is a schematic structural diagram of the support device.

[0024] 10 - inner rotating shaft, L1 - tightening direction of the locking screw, L2 - rotating direction of the inner rotating shaft, 713 - adjusting shim. DETAILED DESCRIPTION OF THE INVENTION

[0025] The following will describe in detail the specific embodiments of the present invention with reference to the drawings.

[0026] Embodiment 1

[0027] As Figure 1 , Figure 2An air suspension radial bearing as shown, which includes a bearing housing 1, a wave foil 2, a middle foil 3, a top foil 4 and a locking screw 5; the bearing housing 1 is provided with a bearing hole 11, a fixing groove 12 and a screw hole 13, and the wave foil 2, the middle foil 3 and the top foil 4 are all in the shape of an open ring; the wave foil 2 is fixedly sleeved on the outer wall of the middle foil 3, the middle foil 3 is sleeved on the outer wall of the top foil 4, and the outer wall of the wave foil 2 is embedded in the bearing hole 11; both the middle foil 3 and the top foil 4 are provided with fixing parts 41 protruding from their respective outer walls on one side of their respective open ends, the fixing part of the middle foil 3 and the fixing part 41 of the top foil 4 both pass through the open end of the wave foil 2 and are in contact with each other; the fixing part of the middle foil 3 and the fixing part 41 of the top foil 4 are both fitted in the fixing groove 12, the locking screw 5 is screwed into the screw hole 13, and its top end contacts the bottom surface of the fixing part 41 of the middle foil 3 to press the fixing parts 41 of the middle foil 3 and the top foil 4 in the fixing groove 12. In this way, the assembly of the wave foil 2, the middle foil 3 and the top foil 4 is pressed in the fixing groove 12 by the top end of the locking screw 5. When the wave foil 2, the middle foil 3 or the top foil 4 is damaged and needs to be replaced, only the locking screw 5 needs to be removed to disassemble the assembly of the wave foil 2, the middle foil 3 and the top foil 4, and there is no need to replace the bearing housing; thus reducing the number of parts that need to be replaced and lowering the maintenance cost of the bearing.

[0028] The pressing and fixing direction of the locking screw 5 is the same as the rotation direction of the inner rotating shaft supported by the air suspension radial bearing. Thus, when the locking screw 5 presses the assembly of the wave foil 2, the middle foil 3 and the top foil 4, it will not be affected by the opposite force provided by the inner rotating shaft, which is beneficial to maintaining the fastening effect of the locking screw 5.

[0029] A plurality of temperature sensors 14 are also fixedly arranged on the end face of the bearing housing 1, and the temperature sensors 14 are used to detect the surface temperature of the air suspension radial bearing. When the surface temperature of the bearing rises, it can be detected by the temperature sensors 14 and an emergency stop can be carried out to reduce losses.

[0030] The wave foil 2 is provided with a plurality of connecting parts, and the plurality of connecting parts connect the multi-segment wave foil 2 into a single-piece integral wave foil 2. Thus, it avoids the situation of welding the multi-segment wave foil 2 to form a single-piece integral wave foil 2, simplifies the welding process, and improves the qualified rate of parts.

[0031] The inner surface of the top foil 4 is provided with a polytetrafluoroethylene coating to improve the high-temperature resistance characteristics of the bearing and reduce the friction coefficient on the surface of the top foil 4. The wave foil 2 and the middle foil 3 are fixedly connected by laser welding.

[0032] As Figure 4A hydrogen energy compressor as shown, the compressor includes a motor cylinder 61, a motor stator 62, a motor shaft 620, an air suspension radial bearing 63, an air suspension axial bearing 64 and a thrust disc 65; the motor stator 62 is fixedly embedded in the motor cylinder 61, the motor shaft 620 is provided with a motor rotor, and the motor rotor is aligned with the motor stator 62; two air suspension radial bearings 63 are sleeved at both ends of the motor shaft 620 for providing radial support and limit to the motor shaft; the thrust disc 65 is fixedly sleeved on the motor shaft 620, and the supporting part of the air suspension axial bearing 64 is located on both sides of the thrust disc 65 for axially limiting the thrust disc 65.

[0033] As Figure 5 , Figure 6 shown, the air suspension axial bearing 64 includes a first fixing plate 71, a second fixing plate 72, a supporting device 73 and a positioning pin 74; two supporting devices 73 are relatively arranged and are respectively located on the relatively arranged first fixing plate 71 and second fixing plate 72; the supporting device 73 includes a bottom foil 731, an axial wave foil 732 and an axial top foil 733, the axial wave foil 732 is axially located between the bottom foil 731 and the axial top foil 733 and the three are fixedly connected; the first fixing plate 71 and the second fixing plate 72 are relatively provided with pin holes 711, and the bottom foil 731 is provided with a plurality of pin slots 712 axially penetrating and aligned with the pin holes 711; the positioning pin 74 passes through the pin slots 712 of the two supporting devices 73, and its two ends are respectively embedded in the pin holes 711 on the first fixing plate 71 and the second fixing plate 72. In this way, a plurality of positioning pins 74 pass through the pin slots 712 of the two supporting devices 73 to radially limit them, preventing the supporting device 73 from rotating with the thrust disc 65 driven by the motor shaft 620 when the motor shaft 620 rotates; when the rotational speed of the motor shaft 620 reaches a certain level, an air film is formed between the supporting device 73 and the thrust disc 65, so that they are separated to achieve the suspension effect; compared with fixing the bottom foil 731 by screw locking, the positioning pin 74 limiting method does not provide a pressing force on the surface of the bottom foil 731 and will not cause it to be pressed and deformed; thus, it will not cause the bearing surface to be uneven axially, which is conducive to forming an air film between the bearing surface and the motor shaft 620 and improves the service life of the bearing.

[0034] The pin slot 712 is an open slot. Four pin slots 712 are arranged in pairs relatively, and the connecting lines of the pin slots 712 arranged in pairs relatively are perpendicular to each other to realize the limit of the supporting device 3 in the up and down radial directions and the left and right radial directions.

Claims

1. A hydrogen energy compressor, characterized in that, The compressor includes a motor cylinder (61), a motor stator (62), a motor shaft (620), an air suspension radial bearing (63), an air suspension axial bearing (64), and a thrust disk (65); the air suspension radial bearing (63) includes a bearing housing (1), a wave foil (2), a middle foil (3), a top foil (4), and a locking screw (5); the bearing housing (1) is provided with a bearing hole (11), a fixing groove (12), and a screw hole (13), and the wave foil (2), the middle foil (3), and the top foil (4) are all in the shape of an open ring; the wave foil (2) is fixedly sleeved on the outer wall of the middle foil (3), the middle foil (3) is sleeved on the outer wall of the top foil (4), and the outer wall of the wave foil (2) is embedded in the bearing hole (11); the middle foil (3) and the top foil (4) are both provided with fixing parts (41) protruding from their respective outer walls on one side of their respective open ends, the fixing part of the middle foil (3) and the fixing part (41) of the top foil (4) both pass through the open end of the wave foil (2) and are in contact with each other; the fixing part of the middle foil (3) and the fixing part (41) of the top foil (4) are both fitted in the fixing groove (12), the locking screw (5) is screwed into the screw hole (13), and its top end contacts the bottom surface of the fixing part (41) of the middle foil (3) to press the fixing parts (41) of the middle foil (3) and the top foil (4) in the fixing groove (12); the pressing and fixing direction of the locking screw (5) is the same as the rotation direction of the inner rotating shaft supported by the air suspension radial bearing; The wave foil (2) is provided with a plurality of connecting parts, and the plurality of connecting parts connect the multi-segment wave foil (2) into a single-piece integral wave foil (2); the wave foil (2) and the middle foil (3) are fixedly connected by laser welding; the inner surface of the top foil (4) is provided with a polytetrafluoroethylene coating; the motor stator (62) is fixedly embedded in the motor cylinder (61), the motor shaft (620) is provided with a motor rotor, and the motor rotor is aligned with the motor stator (62); two air suspension radial bearings (63) are sleeved at both ends of the motor shaft (620) to provide radial support and limit for the motor shaft; the thrust disk (65) is fixedly sleeved on the motor shaft (620), and the supporting parts of the air suspension axial bearing (64) are located on both sides of the thrust disk (65) to axially limit the thrust disk (65).

2. The hydrogen energy compressor according to claim 1, characterized in that, The air suspension axial bearing (64) includes a first fixing plate (71), a second fixing plate (72), a support device (73) and a positioning pin (74); two support devices (73) are arranged oppositely and are respectively located on the relatively arranged first fixing plate (71) and second fixing plate (72); the support device (73) includes a bottom foil (731), an axial wave foil (732) and an axial top foil (733), the axial wave foil (732) is axially located between the bottom foil (731) and the axial top foil (733) and the three are fixedly connected; there are pin holes (711) arranged oppositely on the first fixing plate (71) and the second fixing plate (72), and a plurality of pin slots (712) axially penetrating and aligned with the pin holes (711) are arranged on the bottom foil (731); the positioning pin (74) passes through the pin slots (712) of the two support devices (73), and its two ends are respectively embedded in the pin holes (711) on the first fixing plate (71) and the second fixing plate (72).

3. The hydrogen energy compressor according to claim 1, wherein The pin slot (712) is an open slot.

4. The hydrogen energy compressor according to claim 1, wherein, Four pin slots (712) are arranged in pairs oppositely, and the connecting lines of the pin slots (712) arranged in pairs oppositely are perpendicular to each other.

5. The hydrogen energy compressor according to claim 1, wherein A plurality of temperature sensors (14) are also fixedly arranged on the end face of the bearing housing (1), and the temperature sensors (14) are used to detect the surface temperature of the air suspension radial bearing.

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