Radial gas bearing with adjustable elastic ring

Abstract

The invention discloses a radial gas bearing with an adjustable elastic ring, which belongs to the technical field of radial gas bearings and comprises the adjustable elastic ring, a bearing sleeve and an adjusting bolt. The adjustable elastic ring is of a flexible cylinder structure and is arranged in the bearing sleeve; the bearing sleeve is of a rigid cylinder structure, and the adjusting bolt is used for connecting the bearing sleeve and the adjustable elastic ring. The adjustable elastic ring comprises an adjustable part and a first cylinder part; the bearing rotor is sleeved with the first cylinder part, and the first cylinder part and the bearing rotor are coaxially arranged. The adjustable part is fixedly connected with the first cylinder part; the bearing sleeve comprises a fixed part and a second cylinder part; the second cylinder part and the first cylinder part are coaxially arranged; the fixed part is fixedly connected with the second cylinder part; the second cylinder part is sleeved on the first cylinder part, and the fixed part is covered outside the adjustable part; the adjusting bolt penetrates through the fixed part and the adjustable part and is in threaded connection with the adjustable part. The device has the advantages of being simple in adjusting structure, easy and convenient to manufacture, easy to replace and disassemble, high in practicability and long in service life.

Description

Technical Field

[0001] The invention belongs to the technical field of radial gas bearings, and more particularly relates to a radial gas bearing with an adjustable elastic ring. Background Art

[0002] In order to reduce carbon emissions, people urgently need to develop new automotive power sources to reduce oil and gas consumption and tail gas emissions, and reduce pollution to the environment. Hydrogen fuel cells are known as one of the most ideal automotive power sources due to their high energy conversion rate and zero emissions. The centrifugal air compressor of automotive hydrogen fuel cells needs to meet the requirements of oil-free, high efficiency, fast dynamic response, wide working range, oil-free and clean air supply, small and efficient, and low vibration and noise. Therefore, oil-free bearings must be used in the design process of the motor rotor support bearing. Bearings are important components of air compressors. Traditional oil-lubricated bearing air compressors can no longer meet the requirements. In addition, as a vehicle-standard system, the weight and volume of the hydrogen fuel cell system should be reduced as much as possible. Hydrodynamic gas bearings that can rotate at ultra-high speeds, are oil-free and lubricated, have a simple structure, and are noise-free and vibration-free are ideal choices.

[0003] At present, the spiral groove gas bearings used in fuel cell air compressors are made of cemented carbide as the material of the bearing rotor and bearing ring, and the spiral groove is etched on the surface of the bearing rotor. This structural design has many disadvantages. The cemented carbide material is very expensive and difficult to process. The spiral groove etched on the rotor is not conducive to the standardization of bearing design. The assembly gap between the spiral groove gas bearing rotor and the bearing ring is usually only a few microns to more than ten microns. The assembly difficulty leads to further increase in costs. In addition, when the bearing fails, it is difficult for the air compressor to maintain and replace the bearing alone.

[0004] Therefore, how to provide a radial gas bearing with an adjustable elastic ring is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0005] In view of this, the present invention provides a radial gas bearing with an adjustable elastic ring, which adopts the following technical solution:

[0006] A radial gas bearing with an adjustable elastic ring comprises an adjustable elastic ring, a bearing sleeve and an adjusting bolt; the adjustable elastic ring is a flexible cylindrical structure, and is arranged inside the bearing sleeve; the bearing sleeve is a rigid cylindrical structure, and the adjusting bolt is used to connect the bearing sleeve and the adjustable elastic ring; the adjustable elastic ring comprises an adjustable portion and a first cylindrical portion; the first cylindrical portion is sleeved on a bearing rotor and is coaxially arranged with the bearing rotor; the adjustable portion and the first cylindrical portion are fixedly connected; the bearing sleeve comprises a fixed portion and a second cylindrical portion; the second cylindrical portion is coaxially arranged with the first cylindrical portion; the fixed portion and the second cylindrical portion are fixedly connected; the second cylindrical portion is sleeved on the first cylindrical portion, and the fixed portion cover is arranged outside the adjustable portion; the adjusting bolt passes through the fixed portion and the adjustable portion, and is threadedly connected to the adjustable portion.

[0007] Furthermore, the adjustable elastic ring is formed by rolling a metal strip of a highly elastic material.

[0008] Furthermore, one side of the first cylindrical portion is open; the adjustable portion includes two adjustment ears symmetrically arranged relative to the opening of the first cylindrical portion; the two adjustment ears are arranged outward along the normal direction of the opening of the first cylindrical portion, and one end is fixedly connected to both sides of the opening of the first cylindrical portion, and the connection is smoothly arranged close to one side of the bearing rotor.

[0009] Furthermore, the second cylindrical portion is provided with an opening corresponding to the opening position of the first cylindrical portion; and the opening of the second cylindrical portion is connected to two ends of the fixing portion.

[0010] Furthermore, spiral grooves are evenly distributed on the inner surface of the adjustable elastic ring, and the cross-sectional shape of the grooves is a quadrilateral, an arc, an involute or a U-shape.

[0011] Furthermore, a single row or double row of grooves is arranged on the inner surface of the adjustable elastic ring along the width direction, and the double row of grooves are symmetrically distributed relative to the center plane in the width direction.

[0012] Furthermore, threaded through holes are arranged at the center positions of the two adjusting ears, and the pitches of the two threaded through holes are different; a smooth through hole is arranged at the center position of the fixing part, and is coaxially arranged with the threaded through hole.

[0013] Furthermore, the adjusting bolt passes through the smooth through hole and the threaded through hole in sequence from the outside; the adjusting bolt screw includes two sections of threads with different pitches and the same thread direction, which respectively match the threads inside the two threaded through holes.

[0014] Furthermore, two straight grooves are symmetrically arranged on both sides of the fixing portion along the opening of the second cylindrical portion, and the smooth through hole is opened on the side wall of the straight groove, so that the nut fixing surface of the adjusting bolt is a plane.

[0015] The beneficial effects of the present invention are:

[0016] (1) In the present invention, an adjusting bolt is arranged between the bearing sleeve and the adjustable elastic ring. By adjusting the adjusting bolt, the deformation of the adjusting ears at both ends of the bearing is appropriately changed, thereby adjusting the air film gap of the bearing.

[0017] (2) The adjustable elastic ring of the present invention can be made from a flat metal strip, grooves are etched thereon, and then rolled into a ring shape and assembled into a bearing sleeve. Such a structure is convenient to manufacture, and is easy to install, maintain and replace, which can greatly reduce the cost of the bearing.

[0018] (3) The present invention separates the spiral groove from the bearing rotor through an adjustable elastic ring, and the bearing rotor can be made of ordinary alloy materials, which greatly saves costs.

[0019] (4) The adjustment structure of the present invention is simple, easy to manufacture, easy to replace and disassemble, highly practical, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure after the present invention is installed on a bearing rotor in one embodiment.

[0022] Figure 2 for Figure 1 Side view of.

[0023] Figure 3 It is a schematic structural diagram of the adjustable elastic ring of the present invention.

[0024] Figure 4 It is a schematic structural diagram of the bearing sleeve of the present invention.

[0025] Figure 5 It is a schematic diagram of installing the adjusting bolt of the present invention.

[0026] Figure 6 It is a planar development diagram of the adjustable elastic ring of the present invention.

[0027] Figure 7 It is a schematic structural diagram of another embodiment of the present invention after being installed on a bearing rotor.

[0028] Figure 8 for Figure 7 Side view of.

[0029] Among them, in the figure:

[0030] 1-bearing rotor; 2-adjustable elastic ring; 21-adjusting ear; 22-first cylindrical portion; 3-bearing sleeve; 31-fixing portion; 32-second cylindrical portion; 4-adjusting bolt; 5-threaded through hole; 6-groove; 7-smooth through hole. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Please refer to the attached Figure 1-6 The present invention provides a radial gas bearing with an adjustable elastic ring, comprising an adjustable elastic ring 2, a bearing sleeve 3 and an adjusting bolt 4.

[0033] The adjustable elastic ring 2 is a flexible cylindrical structure, arranged inside the bearing sleeve 3, and is made of a metal strip of a highly elastic material such as a nickel-based alloy. The adjustable elastic ring 2 includes an adjustable portion and a first cylindrical portion 22. The first cylindrical portion 22 is sleeved on the bearing rotor 1 and is coaxially arranged with the bearing rotor 1. One side of the first cylindrical portion 22 is open. The adjustable portion includes two adjustment ears 21 symmetrically arranged relative to the opening of the first cylindrical portion 22. The two adjustment ears 21 are arranged outward along the normal direction of the opening of the first cylindrical portion 22, and one end is fixedly connected to both sides of the opening of the first cylindrical portion 22, and the connection is smoothly arranged near the side of the bearing rotor 1. The thickness of the adjustable elastic ring 2 is 0.5mm to 1mm.

[0034] A threaded through hole 5 is provided at the center of the two adjusting ears 21 , and the thread pitches of the two threaded through holes 5 are different.

[0035] When the bearing rotor 1 rotates, the adjustable elastic ring 2 is instantly pressed against the bearing sleeve 3 by the gas film pressure under the action of gas dynamic pressure. Since the surface of the adjustable elastic ring 2 is flexible, it can be easily replaced and disassembled, thereby extending the service life.

[0036] The inner surface of the adjustable elastic ring 2 is evenly distributed with spiral grooves 6, and the cross-sectional shape of the grooves 6 can be a quadrilateral, an arc, an involute or a U-shape; the inner surface of the adjustable elastic ring 2 is provided with a single row or a double row of grooves 6 along the width direction, and the double row of grooves 6 are symmetrically distributed relative to the center plane in the width direction; the spiral grooves 6 and the adjustable elastic ring 2 are provided as a whole, which can more effectively absorb the influence of component deformation on the bearing rotor and the bearing working clearance.

[0037] The bearing sleeve 3 serves as a bearing support component and is a rigid cylindrical structure. The inner ring surface of the bearing sleeve 3 is coated with an anti-wear coating and is sleeved on the adjustable elastic ring 2. The bearing sleeve 3 includes a fixed portion 31 and a second cylindrical portion 32. The second cylindrical portion 32 is coaxially arranged with the first cylindrical portion 22 and opens at the same position. The opening of the second cylindrical portion 32 connects the two ends of the fixed portion 31. The fixed portion 31 is covered on the outside of the adjustable portion. A smooth through hole 7 is provided at the center of the fixed portion 31 and is coaxially arranged with the threaded through hole 5.

[0038] The adjusting bolt 4 passes through the smooth through hole 7 and the threaded through hole 5 in sequence from the outside. The screw of the adjusting bolt 4 includes two sections of threads with different pitches and the same thread direction, which respectively match the threads inside the two threaded through holes 5. The moving direction and number of turns of the adjusting bolt 4 can be controlled by rotating the adjusting bolt 4, and the two pitches act simultaneously to adjust the air film gap between the adjustable elastic ring 2 and the bearing rotor 1.

[0039] The two threads of the adjusting bolt 4 can be selected in various specifications, and the assembly diagram is as follows: Figure 5 For example, the thread specification of the right half is M6×0.75 (national standard fine thread), which is fixed in the right threaded through hole 5; the thread specification of the left half is M5×0.8 (national standard coarse thread), which is fixed in the left threaded through hole 5. If the adjusting bolt 4 is rotated clockwise (from right to left) as a whole, then Figure 5 In the figure, the right half moves 0.75mm to the left together with the elastic ring; at the same time, the left half of the adjusting bolt 4 moves 0.8mm to the left. Since the left half is also connected to the adjustable elastic ring 2, the left half of the adjusting bolt 4 moves 0.8mm to the left, which is manifested as the right side moving 0.8mm to the right relative to the left side. Therefore, the adjustable elastic ring 2 participates in the movement of 0.75mm to the left and 0.8mm to the right at the same time, and generally shows a movement of 0.05mm to the right, that is, a displacement of 0.05mm is generally shown; similarly, the adjusting bolt 4 rotates one circle counterclockwise, and the adjustable elastic ring 2 moves 0.05mm to the left. It can be seen that this design can ensure that the adjustable elastic ring 2 moves left and right, thereby adjusting the air film gap. When the adjusting bolt 4 rotates 1 / 10 circle clockwise, the adjustment accuracy can be accurate to micron level (0.001mm).

[0040] Assume that the radius of the first cylindrical portion 22 of the adjustable elastic ring 2 before adjustment is R 0 , the adjusted radius is: R = R 0 +ΔR, Δl is the arc length of the adjustment mechanism, that is, the adjustment value of the air film gap after the adjustment bolt is turned 4 times. The derivation formula is:

[0041] 2πR 0 +Δl=2πR

[0042]

[0043] Δl=2πΔR=2π(RR 0 )

[0044] In another embodiment of the present invention, please refer to the attached Figure 7-8 In order to facilitate processing, manufacturing and adjustment, two straight grooves are symmetrically arranged on both sides of the fixing portion 31 of the bearing sleeve 3 along the opening of the second cylindrical portion 32, and the smooth through hole 7 is opened on the side wall of the straight groove, so that the nut fixing surface of the adjusting bolt 4 is flat, which is convenient for adjustment.

[0045] The radial gas bearing of the present invention is improved in design, and the spiral groove 6 of the bearing is etched on the surface of the adjustable elastic ring 2, and the elastic metal band is surrounded into a ring body to form the adjustable elastic ring 2, and then fixed with the bearing sleeve 3 by the adjusting bolt 4, and the air film gap of the bearing can be arbitrarily adjusted within a certain range through the adjustable part. Such a structural design can make the spiral groove gas bearing not have to select expensive hard alloy materials, and the bearing rotor 1 and the bearing sleeve 3 can select ordinary alloy materials, which greatly reduces the bearing material cost and processing cost, and the adjustable design reduces the assembly difficulty of the bearing, and the spiral groove 6 is etched on the bearing adjustable elastic ring 2 to facilitate the maintenance and parts replacement during the use of the air compressor, thereby reducing the use cost of the air compressor. The spiral groove is engraved on the inner surface of the adjustable elastic ring 2, which brings great convenience compared with the prior art, and the adjustable elastic ring 2 is easy to replace and disassemble, and the service life is extended.

[0046] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0047] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A radial gas bearing with an adjustable elastic ring, characterized in that: It comprises an adjustable elastic ring (2), a bearing sleeve (3) and an adjusting bolt (4); the adjustable elastic ring (2) is a flexible cylindrical structure and is arranged inside the bearing sleeve (3); the bearing sleeve (3) is a rigid cylindrical structure, and the adjusting bolt (4) is used to connect the bearing sleeve (3) and the adjustable elastic ring (2); The adjustable elastic ring (2) comprises an adjustable portion and a first cylindrical portion (22); the first cylindrical portion (22) is sleeved on the bearing rotor (1) and is coaxially arranged with the bearing rotor (1); the adjustable portion and the first cylindrical portion (22) are fixedly connected; the bearing sleeve (3) comprises a fixed portion (31) and a second cylindrical portion (32); the second cylindrical portion (32) is coaxially arranged with the first cylindrical portion (22); the fixed portion (31) and the second cylindrical portion (32) are fixedly connected; the second cylindrical portion (32) is sleeved on the first cylindrical portion (22), and the fixed portion (31) is covered outside the adjustable portion; the adjusting bolt (4) passes through the fixed portion (31) and the adjustable portion, and is threadedly connected with the adjustable portion.

2. A radial gas bearing with an adjustable elastic ring according to claim 1, characterized in that: The adjustable elastic ring (2) is formed by rolling a metal strip made of a highly elastic material.

3. A radial gas bearing with an adjustable elastic ring according to claim 1, characterized in that: One side of the first cylindrical portion (22) is open; the adjustable portion comprises two adjustment ears (21) symmetrically arranged relative to the opening of the first cylindrical portion (22); the two adjustment ears (21) are arranged outwardly along the normal direction of the opening of the first cylindrical portion (22), one end of each of which is fixedly connected to both sides of the opening of the first cylindrical portion (22), and the connection is smoothly arranged close to one side of the bearing rotor (1).

4. A radial gas bearing with an adjustable elastic ring according to claim 1, characterized in that: The second cylindrical portion (32) is provided with an opening corresponding to the opening position of the first cylindrical portion (22); the opening of the second cylindrical portion (32) is connected to two ends of the fixing portion (31).

5. A radial gas bearing with an adjustable elastic ring according to claim 1, characterized in that: The inner surface of the adjustable elastic ring (2) is evenly distributed with spiral grooves (6), and the cross-sectional shape of the grooves (6) is a quadrilateral, an arc, an involute or a U shape.

6. A radial gas bearing with an adjustable elastic ring according to claim 5, characterized in that: The inner surface of the adjustable elastic ring (2) is provided with a single row or a double row of grooves (6) along the width direction, and the double row of grooves (6) are symmetrically distributed relative to the center plane in the width direction.

7. A radial gas bearing with an adjustable elastic ring according to claim 3, characterized in that: A threaded through hole (5) is provided at the center of the two adjusting ears (21), and the thread pitches of the two threaded through holes (5) are different; a smooth through hole (7) is provided at the center of the fixing portion (31), and is coaxially arranged with the threaded through hole (5).

8. A radial gas bearing with an adjustable elastic ring according to claim 7, characterized in that: The adjusting bolt (4) passes through the smooth through hole (7) and the threaded through hole (5) in sequence from the outside; the screw of the adjusting bolt (4) comprises two sections of threads with different pitches and the same thread direction, which respectively match the threads inside the two threaded through holes (5).

9. A radial gas bearing with an adjustable elastic ring according to claim 8, characterized in that: Two straight grooves are symmetrically arranged on both sides of the fixing portion (31) along the opening of the second cylindrical portion (32), and the smooth through hole (7) is opened on the side wall of the straight groove, so that the nut fixing surface of the adjusting bolt (4) is a plane.

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