A dynamic pressure sliding bearing for high-speed rotor

Abstract

A hydrodynamic sliding bearing for a high-speed rotor relates to the field of lubrication of a rotating support, including a housing with an oil filling hole and a bearing body, an annular boss is arranged around the middle of the circumferential surface of the bearing body, and the surface of the annular boss is interference fit with the housing, thereby dividing the area between the circumferential surface of the bearing body and the housing into two left and right oil distribution grooves, each of which injects lubricating oil into the assembly gap between the bearing body and the high-speed rotor through 4-6 arc-shaped oil filling grooves distributed around the center of the high-speed rotor; a transverse groove running through the width direction of the annular boss is arranged on the annular boss, and the transverse groove is connected to the oil filling hole, thereby diverting the lubricating oil injected from the oil filling hole into the left and right oil distribution grooves. The presence of the arc-shaped oil filling groove of the present invention greatly improves the time required for the lubricating oil to enter the oil distribution groove and cover the rotor surface, effectively reducing power consumption and temperature rise.

Description

Technical Field

[0001] The invention relates to the field of rotary mechanical support lubrication, in particular to a dynamic pressure sliding bearing for a high-speed rotor. Background Art

[0002] Sliding bearings have the advantage of good running stability and are widely used in rotating machinery. However, with the continuous increase in the speed of rotating machinery, higher requirements are placed on the performance of sliding bearings, and the stability, power consumption, temperature rise and ability to quickly form an oil film of sliding bearings have become the main obstacles restricting their application. Therefore, in many occasions, there is a trend of being replaced by rolling bearings. However, in some important occasions, such as industrial high-speed heavy-load gear rotor systems, high-speed motor spindle rotation systems, internal combustion engine connecting rods, etc., sliding bearings still have irreplaceable advantages. How to reduce the power consumption and temperature rise of sliding bearings, improve the ability of sliding bearings to quickly form an oil film, and improve the stability of sliding bearings have become key issues for sliding bearings to play an important role.

[0003] In the prior art, water cooling or lubricating oil cooling is generally used to reduce power consumption and temperature rise. The method is generally to set oil grooves on the inner and outer rings of the sliding bearing and connect them through oil injection channels, so that the lubricating oil can quickly enter the assembly gap between the inner ring of the sliding bearing and the rotor, such as the "spiral groove sliding bearing and centrifugal pump" disclosed in the patent application number "2014204361822";

[0004] However, due to the high-speed rotation of the rotor, the rate at which the lubricating oil enters the inner oil groove from the outer oil groove through the oil filling channel is very slow. Therefore, it takes a long time to form an oil film covering the rotor, and the flow rate of the lubricating oil is also slow, which cannot effectively solve the power consumption and temperature rise problems of the sliding bearing. Summary of the invention

[0005] In order to solve the problem that the lubricating oil circuit of the existing sliding bearing cannot solve the power consumption and temperature rise problems well, the present invention provides a dynamic pressure sliding bearing for a high-speed rotor. By modifying the structure of the lubricating oil groove on the bearing body, it can quickly and effectively form an oil film evenly distributed on the rotor, quickly reduce the power consumption and temperature rise of the sliding bearing, improve the stability of the sliding bearing, and enable it to meet more complex service conditions.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a dynamic pressure sliding bearing for a high-speed rotor, comprising a shell and a bearing body arranged in the shell, the high-speed rotor passes through the shell and the inner ring of the bearing body, and has an assembly gap with the inner ring of the bearing body, an oil filling hole is arranged on the shell, an annular boss is arranged around the middle of the circumferential surface of the bearing body, and the surface of the annular boss is interference fit with the shell, thereby dividing the area between the circumferential surface of the bearing body and the shell into two left and right oil distribution grooves, each oil distribution groove injects lubricating oil into the assembly gap between the bearing body and the high-speed rotor through 4-6 arc-shaped oil filling grooves distributed around the center of the high-speed rotor; the annular boss is provided with a transverse groove running through its width direction, and the transverse groove is connected to the oil filling hole, thereby diverting the lubricating oil injected into the oil filling hole into the left and right oil distribution grooves.

[0007] As an optimization solution for the above-mentioned hydrodynamic sliding bearing for high-speed rotors, the two end faces of the bearing body are interference fit with the inner end face of the housing so that the lubricating oil in the two oil distribution grooves can only flow into the assembly gap through the arc-shaped oil filling groove.

[0008] As another optimization solution for the hydrodynamic sliding bearing for the high-speed rotor, the arc-shaped connecting line from the oil distribution groove to the assembly gap of the arc-shaped oil filling groove is consistent with the rotation direction of the high-speed rotor.

[0009] As another optimization scheme for the above-mentioned hydrodynamic sliding bearing for high-speed rotors, the arc-shaped oil filling groove includes an arc-shaped area arched toward the oil distribution groove in the middle area, the outer side of the arc-shaped area expands outward to form an oil inlet area connected to the oil distribution groove, and the inner side of the arc-shaped area forms an oil outlet area connected to the assembly gap, and the thickness gradually decreases along the direction of the oil inlet area, the arc-shaped area and the oil outlet area.

[0010] As another optimization scheme for the above-mentioned hydrodynamic sliding bearing for high-speed rotors, the oil outlet area and the assembly clearance connection portion form a triangular area, and the two triangular areas located at corresponding positions on both sides of the bearing body are connected, thereby forming a strip oil wedge groove parallel to its axial direction on the surface of the high-speed rotor.

[0011] As another optimization scheme for the above-mentioned hydrodynamic sliding bearing for high-speed rotors, the side wall of the two side walls of the oil inlet area, which is located on the front side in the rotation direction of the high-speed rotor, is distributed along the diameter direction of the bearing body, and the side wall is connected to the side wall of the arc zone by an arc-shaped transition, thereby forming a recessed groove on one side of the oil inlet area.

[0012] As another optimization scheme for the above-mentioned hydrodynamic sliding bearing for high-speed rotors, the shell includes two symmetrically arranged upper and lower parts, and each part includes a semicircular side plate, and a semicircular end plate is arranged at each end of the semicircular side plate, the inner side surface of the semicircular end plate is interference fit with the end surface of the bearing body, and the inner side surface of the semicircular side plate is interference fit with the outer side surface of the annular boss on the bearing body.

[0013] As another optimization solution for the above-mentioned hydrodynamic sliding bearing for high-speed rotors, the upper and lower parts of the housing are fixedly connected by a connecting pin.

[0014] As another optimization scheme for the above-mentioned hydrodynamic sliding bearing for high-speed rotor, the inner diameter of the housing is equal to the inner diameter of the bearing body, and the assembly clearance formed by the bearing body and the high-speed rotor is 1.5-2.5‰ of the inner diameter of the bearing body.

[0015] As another optimization solution for the above-mentioned dynamic pressure sliding bearing for high-speed rotors, a positioning pin is provided on the annular boss, and the positioning pin cooperates with a positioning hole on the housing to realize the positioning of the bearing body in the housing.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) The present invention provides an annular boss that is interference-fitted with the housing and a transverse groove on the annular boss, thereby forming two left and right oil distribution grooves between the housing and the bearing body, and each oil distribution groove is provided with 4-6 arc-shaped oil filling grooves. The existence of these arc-shaped oil filling grooves greatly improves the time required for the lubricating oil to enter the oil distribution groove and cover the rotor surface, effectively reducing power consumption and temperature rise;

[0018] 2) The arc-shaped oil filling groove of the present invention adopts a structure that is wide outside and narrow inside, and the arc bending direction is consistent with the rotation direction of the high-speed rotor, which can effectively reduce the resistance between the bearing and the rotor, increase the flow speed of the lubricating oil in the oil filling groove, and further reduce power consumption and temperature rise;

[0019] 3) The oil outlet area of ​​the arc-shaped oil filling groove of the present invention forms a triangular area with the connection part of the assembly gap, and the two triangular areas located at the corresponding positions of the two end surfaces of the bearing body are in a connected state, thereby forming a strip oil wedge groove parallel to its axial direction on the surface of the high-speed rotor. The existence of the strip oil wedge groove can not only accelerate the flow speed of the lubricating oil in the oil filling groove and the film forming speed on the rotor surface, but more importantly, under the action of multiple oil wedges in different directions, it can resist partial impact generated by the rotor, effectively suppress the vibration of the rotor, and improve the stability of the rotor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an axial section of the present invention;

[0021] Figure 2 is a schematic axial cross-sectional view of the housing of the present invention;

[0022] Figure 3 is a schematic diagram of an axial section of a bearing body of the present invention;

[0023] Figure 4 It is a radial cross-sectional schematic diagram of the present invention;

[0024] Figure 5 Schematic diagram of radial section of the oil filling groove of the present invention;

[0025] Figure 6 is a schematic diagram of the end face of the bearing body of the present invention;

[0026] Figure 7 It is an external schematic diagram of the present invention without the upper shell;

[0027] Figure numerals: 1. Shell, 101. Side plate, 102. End plate, 103. Oil filling hole, 104. Positioning hole, 105. Connecting pin, 2. Bearing body, 201. Cross-cut groove, 202. Oil distribution groove, 203. Annular boss, 204. Positioning pin, 3. Arc-shaped oil filling groove, 301. Arc-shaped area, 302. Oil inlet area, 303. Oil outlet area, 304. Concave groove, 305. Triangular area, 306. Strip oil wedge groove, 4. Rotor rotation direction. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. The parts not explained in the following embodiments of the present invention should be understood as the prior art known or should be known to those skilled in the art.

[0029] Example 1

[0030] A dynamic pressure sliding bearing for a high-speed rotor, such as Figure 1 and 7 As shown, it includes a housing 1 and a bearing body 2 arranged in the housing 1. The high-speed rotor passes through the housing 1 and the inner ring of the bearing body 2, and has an assembly gap with the inner ring of the bearing body 2. The inner diameter of the housing 1 is equal to the inner diameter of the bearing body 2, and the assembly gap formed by the bearing body 2 and the high-speed rotor is generally 1.5-2.5‰ of the inner diameter of the bearing body 2. Figure 2 As shown, an oil filling hole 103 is provided on the housing 1, and the oil filling hole 103 runs through the thickness direction of the housing 1. Figure 3 As shown, an annular boss 203 is arranged around the middle of the circumferential surface of the bearing body 2, and the surface of the annular boss 203 is interference fit with the shell 1, so that the area between the circumferential surface of the bearing body 2 and the shell 1 is divided into two left and right oil distribution grooves 202, the width of the annular boss 203 is generally 25-50% of the width of the bearing body 2, the width of the bearing body 2 refers to the distance between the two end faces, the height of the annular boss 203 is generally 0.5-0.8 times its width, and its height and thickness determine the width and height of the oil distribution groove 202, and at least one positioning pin 204 is arranged on the annular boss 203, and the positioning pin 204 cooperates with the positioning hole 104 on the shell 1 to realize the positioning of the bearing body 2 in the shell 1, and the positioning hole 104 is located on the dividing line between the upper and lower halves of the shell 1;

[0031] like Figure 4 and 6 As shown, each oil distribution groove 202 injects lubricating oil into the assembly gap between the bearing body 2 and the high-speed rotor through 4-6 arc-shaped oil injection grooves 3 distributed around the center of the high-speed rotor. The number of arc-shaped oil injection grooves 3 shown in the figure is 5, thereby forming two completely symmetrical groups of oil injection groove mechanisms. In these two groups of oil injection groove mechanisms, the corresponding two arc-shaped oil injection grooves 3 are at the same position in the diameter direction of the high-speed rotor, and the connecting line is parallel to the axial direction; the side surface of any arc-shaped oil injection groove in these two groups of oil injection groove mechanisms contacts the inner end surface of the housing 1, but due to the interference fit between the inner end surface of the housing 1 and the outer end surface of the bearing body 2 The lubricating oil cannot enter the assembly gap from the end face of the bearing body 2; these arc-shaped oil filling grooves 3 are exactly the same in structure and are evenly distributed around the center of the inner ring of the bearing body 2. Any arc-shaped oil filling groove 3 can completely overlap with other arc-shaped oil filling grooves 3 when rotated a certain angle around the center of the bearing body 2; the arc-shaped oil filling grooves 3; the annular boss 203 is provided with a transverse groove 201 running through the width direction thereof, and the transverse groove 201 is located directly below the oil filling hole 103 and is connected to the oil filling hole 103, thereby diverting the lubricating oil injected into the oil filling hole 103 to the left and right oil distribution grooves 202.

[0032] The above is a basic implementation of the present invention, and further improvements, optimizations and limitations can be made on the above basis to obtain the following embodiments:

[0033] Example 2

[0034] This embodiment is an improvement on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 1 As shown, the two end faces of the bearing body 2 are interference fit with the inner end face of the housing 1, thereby completely closing the side of the oil distribution groove 202, so that the lubricating oil in the two oil distribution grooves 202 can only flow into the assembly gap through the arc-shaped oil filling groove 3, and will not flow into the assembly gap from the two end faces of the bearing body 2.

[0035] Example 3

[0036] This embodiment is another improved solution based on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 4 and 6As shown, the arc-shaped connecting line of the arc-shaped oil filling groove 3 from the oil distribution groove 202 to the assembly gap is consistent with the rotation direction of the high-speed rotor. The so-called arc-shaped connecting line actually refers to the direction of the arc-shaped oil filling groove 3 from the outside to the inside; the arc-shaped oil filling groove 3 includes an arc-shaped area 301 arched toward the oil distribution groove 202 in the middle area, and the outer side of the arc-shaped area 301 expands outward to form an oil inlet area 302 connected to the oil distribution groove 202, and the inner side of the arc-shaped area 301 forms an oil outlet area 303 connected to the assembly gap, and the thickness gradually decreases along the direction of the oil inlet area 302, the arc-shaped area 301 and the oil outlet area 303. The thickness refers to the formation The spacing between the side walls of the bearing body 2 on both sides of the oil filling groove 3, the maximum width of the oil inlet area 302 is generally 0.25-0.3 times X; X is the value obtained by dividing the circumference of the outer ring of the bearing body 2 by the number of arc-shaped oil filling grooves 3, the minimum width of the oil outlet area 303 is generally 0.15-0.2 times Y, Y is the value obtained by dividing the circumference of the inner ring of the bearing body 2 by the number of arc-shaped oil filling grooves 3; the line connecting the beginning of the oil inlet area 302 to the rotation center is defined as straight line A, and the line connecting the end of the oil outlet area 303 to the rotation center is defined as straight line B, and the angle between straight line A and straight line B is generally 55-82°.

[0037] Example 4

[0038] This embodiment is an improved solution based on the embodiment 3. Its main structure is the same as that of the embodiment 3. The improvement is as follows: Figure 5 As shown, the oil outlet area 303 and the assembly gap connection position form a triangular area 305, two sides of the triangular area 305 are actually arc-shaped, and the third side is virtual, which is formed by the outer wall of the high-speed rotor, and the two triangular areas 305 located at the corresponding positions on both sides of the bearing body 2 are connected, so that a strip-shaped oil wedge groove 306 parallel to the axial direction of the high-speed rotor is formed on the surface of the high-speed rotor, as shown in FIG. Figure 7 shown.

[0039] Example 5

[0040] This embodiment is another improved solution based on the embodiment 3. Its main structure is the same as that of the embodiment 3. The improvement is as follows: Figure 5 As shown, the side wall of the two side walls of the oil inlet area 302 that is located on the front side in the rotation direction of the high-speed rotor is distributed along the diameter direction of the bearing body 2, and the side wall is connected to the side wall of the arc area 301 in an arc-shaped transition, thereby forming a recessed groove 304 on one side of the oil inlet area 302.

[0041] Example 6

[0042] This embodiment is another improved solution based on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 2As shown, the shell 1 includes two symmetrically arranged upper and lower parts, and the upper and lower parts of the shell 1 are fixedly connected by a connecting pin 105. Each of the upper and lower parts includes a semicircular side plate 101, and a semicircular end plate 102 is arranged at each end of the semicircular side plate 101. A semicircle is dug out in the center of the semicircular end plate 102 to form an inner ring for accommodating a high-speed rotor, and the semicircular side plate 101 is located in the middle position of the semicircular end plate, so that an annular groove is formed on the outer peripheral surface of the semicircular side plate 101, and the annular groove is used to fix it with a box body and other structures; the inner side surface of the semicircular end plate 102 is interference fit with the end surface of the bearing body 2, and the inner side surface of the semicircular side plate 101 is interference fit with the outer side surface of the annular boss 203 on the bearing body 2.

Claims

1. A dynamic pressure sliding bearing for a high-speed rotor, comprising a housing (1) and a bearing body (2) arranged in the housing (1), wherein the high-speed rotor passes through the housing (1) and the inner ring of the bearing body (2) and has an assembly gap with the inner ring of the bearing body (2), and an oil injection hole (103) is arranged on the housing (1), characterized in that: An annular boss (203) is provided around the middle of the circumferential surface of the bearing body (2), and the surface of the annular boss (203) is interference-fitted with the housing (1), thereby dividing the area between the circumferential surface of the bearing body (2) and the housing (1) into two left and right oil distribution grooves (202), each of which injects lubricating oil into the assembly gap between the bearing body (2) and the high-speed rotor through 4 to 6 arc-shaped oil injection grooves (3) distributed around the center of the high-speed rotor; the annular boss (203) is provided with a transverse groove (201) running through the width direction thereof, the transverse groove (201) being connected to the oil injection hole (103), thereby diverting the lubricating oil injected from the oil injection hole (103) into the two left and right oil distribution grooves (202); The arc-shaped oil filling groove (3) comprises an arc-shaped area (301) arched toward the oil distribution groove (202) in the middle region, the outer side of the arc-shaped area (301) expands outward to form an oil inlet area (302) connected to the oil distribution groove (202), the inner side of the arc-shaped area (301) forms an oil outlet area (303) connected to the assembly gap, and the thickness gradually decreases along the direction of the oil inlet area (302), the arc-shaped area (301) and the oil outlet area (303); The oil outlet area (303) and the assembly clearance connection portion form a triangular area (305), and the two triangular areas (305) located at corresponding positions on both sides of the bearing body (2) are connected, thereby forming a strip-shaped oil wedge groove (306) parallel to the axial direction of the high-speed rotor on the surface of the high-speed rotor; Of the two side walls of the oil inlet area (302), the side wall located on the front side in the rotation direction of the high-speed rotor is distributed along the diameter direction of the bearing body (2), and the side wall is connected to the side wall of the arc area (301) in an arc-shaped transition, thereby forming a recessed groove (304) on one side of the oil inlet area (302).

2. The hydrodynamic sliding bearing for a high-speed rotor according to claim 1, characterized in that: The two end surfaces of the bearing body (2) are interference fit with the inner end surface of the housing (1), so that the lubricating oil in the two oil distribution grooves (202) can only flow into the assembly gap through the arc-shaped oil filling groove (3).

3. The dynamic pressure sliding bearing for a high-speed rotor according to claim 1, characterized in that: The arc-shaped connecting line from the oil distribution groove (202) of the arc-shaped oil filling groove (3) to the assembly gap is consistent with the rotation direction of the high-speed rotor.

4. The hydrodynamic sliding bearing for a high-speed rotor according to claim 1, characterized in that: The housing (1) comprises two symmetrically arranged upper and lower parts, each of which comprises a semicircular side plate (101), and a semicircular end plate (102) is respectively arranged at both ends of the semicircular side plate (101), the inner side surface of the semicircular end plate (102) is interference fit with the end surface of the bearing body (2), and the inner side surface of the semicircular side plate (101) is interference fit with the outer side surface of the annular boss (203) on the bearing body (2).

5. The dynamic pressure sliding bearing for a high-speed rotor according to claim 4, characterized in that: The upper and lower parts of the housing (1) are fixedly connected via a connecting pin (105).

6. The hydrodynamic sliding bearing for a high-speed rotor according to claim 1, characterized in that: The inner diameter of the housing (1) is equal to the inner diameter of the bearing body (2), and the assembly clearance formed between the bearing body (2) and the high-speed rotor is 1.5-2.5‰ of the inner diameter of the bearing body (2).

7. The dynamic pressure sliding bearing for a high-speed rotor according to claim 1, characterized in that: A positioning pin (204) is provided on the annular boss (203), and the positioning pin (204) cooperates with a positioning hole (104) on the housing (1) to achieve positioning of the bearing body (2) in the housing (1).

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