Integral thrust pad bearing with adjustable wedge angle

Abstract

The invention discloses an integral thrust pad bearing with an adjustable wedge angle, and relates to the technical field of thrust bearing design and manufacturing. The problems that the axial size of an existing fixed-pad thrust bearing and an existing tilting-pad thrust bearing cannot be adjusted, variable working condition occasions are difficult to meet, and thrust surfaces are difficult to machine and produce are solved. An annular groove is machined in the end face of one side of a bearing body, a supporting block and an adjusting pad are coaxially installed in the annular groove, a convex spherical surface is machined on the side, away from the adjusting pad, of the supporting block, a thrust pad is arranged on the outer side of the supporting block, a concave spherical surface is machined on one side of the thrust pad, and a circumferential convex edge which is coaxially arranged is further arranged on the side, close to the supporting block, of the thrust pad. An end cover is arranged on the outer side of the thrust pad, a bearing body connecting flange is detachably connected with an end cover connecting flange through an end cover bearing body connecting piece, and a circumferential flange is arranged on one side of the end cover. The axial size of the thrust pad bearing is adjustable, the machining difficulty of the thrust surface is reduced, and the thrust pad bearing is suitable for variable working condition occasions.

Description

Technical Field

[0001] The invention relates to the technical field of thrust bearing design and manufacturing, and in particular to an integral thrust bush bearing with adjustable wedge angle. Background Art

[0002] Thrust bearings are commonly used in rotating machinery. They transfer the axial load of the equipment to the machine base through the dynamic pressure oil film formed between the rotating thrust plate and the thrust pad. At present, there are mainly two types of thrust bearings: fixed thrust pad bearings and tilting pad thrust bearings.

[0003] A thrust surface of a traditional fixed-pad thrust bearing needs to be machined with several wedge surfaces to meet the conditions for oil film formation, but the machining accuracy requirements are high, which greatly increases the production cost of the fixed-pad thrust bearing. Moreover, after machining out of tolerance, the axial size of the bearing cannot be adjusted, making it difficult to recycle it. In addition, the wedge angle between the thrust pad and the rotor thrust plate cannot be adjusted, making it difficult to meet variable operating conditions.

[0004] The thrust pad of a conventional tilting pad thrust bearing is composed of a group of pads (about 10). During processing, it is necessary not only to ensure the processing accuracy of a single pad, but also to ensure that the size difference between a group of pads is between 0.01-0.02mm, which greatly increases the production cycle and cost. Although the tilting pad thrust bearing can adjust the axial size by matching the grinding shim, it is cumbersome to adjust the gap when disassembling or installing the pads because the thrust pads are scattered.

[0005] In summary, the existing fixed pad thrust bearings and the existing tilting pad thrust bearings have the problems of being unable to adjust the axial dimensions of the bearings, being difficult to meet the changing working conditions, and being difficult to process and produce the thrust surfaces. Summary of the invention

[0006] The purpose of the present invention is to solve the problems of existing fixed pad thrust bearings and existing tilting pad thrust bearings that the axial size of the bearings cannot be adjusted, it is difficult to meet variable working conditions and the thrust surface processing and production are difficult, and thus to provide an integral thrust pad bearing with adjustable wedge angle.

[0007] The technical solution of the present invention is:

[0008] A wedge angle adjustable integral thrust pad bearing, comprising a bearing body 1, an adjustment pad 2, a support block 3, a thrust pad 4, an end cover 5 and a plurality of end cover-bearing body connectors 6, wherein the bearing body 1 is a hollow rotating body structure, and a coaxially arranged annular groove 101 is processed on one end face of the bearing body 1, the adjustment pad 2, the support block 3, the thrust pad 4 and the end cover 5 are all annular structures, the support block 3 and the adjustment pad 2 are coaxially embedded in the annular groove 101 from the outside to the inside, the support block 3 is processed with a convex spherical surface 301 on the side away from the adjustment pad 2, the thrust pad 4 is arranged on the outside of the support block 3, and the thrust pad 4 is added on the side close to the support block 3. The thrust washer 4 is provided with a concave spherical surface 401 matching the convex spherical surface 301, and a coaxially arranged circumferential convex edge is provided on the side of the thrust washer 4 close to the support block 3. An end cover 5 is provided on the outer side of the thrust washer 4, and an end cover connecting flange is provided on the side of the end cover 5 close to the bearing body 1. The bearing body 1 is provided with a coaxially arranged bearing body connecting flange on the side close to the end cover 5. The bearing body connecting flange is detachably connected to the end cover connecting flange through a plurality of end cover-bearing body connectors 6. A coaxially arranged circumferential rib 501 is provided on the side of the end cover 5 away from the thrust washer 4, and the circumferential rib 501 is located on the outer side of the circumferential convex edge of the thrust washer 4.

[0009] Furthermore, the adjustment pad 2 includes a plurality of gaskets, which are coaxially installed in the annular groove 101 of the bearing body 1 in sequence from front to back along the axial direction of the thrust bearing.

[0010] Furthermore, the convex spherical surface 301 of the support block 3 and the concave spherical surface 401 of the thrust washer 4 have the same radius and the same relative position to the sphere center. The convex spherical surface 301 and the concave spherical surface 401 are completely fitted and arranged to rotate relative to each other.

[0011] Furthermore, a bearing thrust surface 402 is processed on the side of the thrust bearing 4 away from the adjustment pad 2. The bearing thrust surface 402 is a plane, and a plurality of radially arranged oil grooves are evenly processed on the bearing thrust surface 402 along the circumferential direction. The first and last ends of the oil grooves are respectively connected with the inner and outer side surfaces of the thrust bearing 4.

[0012] Furthermore, the thrust shoe is processed with a plurality of circumferential external teeth 403 evenly arranged along the circumferential direction on the outer side, and the inner side of the end cover 5 is processed with a plurality of circumferential external teeth 503 evenly arranged along the circumferential direction, and the plurality of circumferential external teeth 403 mesh with the plurality of circumferential external teeth 503.

[0013] Furthermore, after the circumferential outer teeth 403 and the circumferential outer teeth 503 are assembled, the tooth side clearance is 0.3-0.5 mm.

[0014] Furthermore, the outer diameter of the thrust washer 4 is φ1, the inner diameter of the circumferential rib 501 of the end cover 5 is φ2, the outer diameter of the circumferential convex edge of the thrust washer 4 is φ3, and φ1<φ2<φ3.

[0015] Furthermore, the end cover 5 is made of spring steel material.

[0016] Furthermore, the end cover-bearing body connecting member 6 is a bolt, a plurality of bearing body connecting bolt holes 102 are evenly opened on the bearing body connecting flange along the circumferential direction, a plurality of end cover connecting bolt holes 502 are evenly opened on the end cover connecting flange along the circumferential direction, the plurality of bearing body connecting bolt holes 102 are arranged in one-to-one correspondence with the plurality of end cover connecting bolt holes 502, and the bearing body connecting flange is connected to the end cover connecting flange by a plurality of bolts.

[0017] Compared with the prior art, the present invention has the following effects:

[0018] 1. Compared with the traditional fixed-pad thrust bearing, the integral thrust pad bearing with adjustable wedge angle described in the present invention has flexible and adjustable axial dimensions, which is conducive to the processing, repair and reuse of out-of-tolerance bearings.

[0019] 2. Compared with the traditional fixed-pad thrust bearing, the dynamic adjustment of the thrust pad 4 and the wedge shape of the rotor thrust plate of the integral thrust pad bearing with adjustable wedge angle described in the present invention is suitable for variable working conditions and can relax the coaxiality requirements between the rotor and the bearing seat.

[0020] 3. Compared with the scattered thrust pads of the traditional tilting pad thrust bearing, the integral flat thrust surface used in the integral thrust pad bearing with adjustable wedge angle described in the present invention is easy to process and install, shortens the production cycle, and reduces the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an axonometric view of the integral thrust pad bearing with adjustable wedge angle described in the present invention;

[0022] Figure 2 It is an exploded view of the integral thrust pad bearing with adjustable wedge angle described in the present invention;

[0023] Figure 3 It is a state diagram of the thrust pad bearing of the integral thrust pad bearing with adjustable wedge angle in the free state of the present invention;

[0024] Figure 4 It is a state diagram of the thrust pad bearing when the integral thrust pad bearing with adjustable wedge angle described in the present invention is in operation.

[0025] In the figure: 1, bearing body; 101, annular groove; 102, bearing body connecting bolt hole; 2, adjustment pad; 3, support block; 301, convex spherical surface; 4, thrust pad; 401, concave spherical surface; 402, bearing pad thrust surface; 403, circumferential external teeth; 5, end cover; 501, circumferential rib; 502, end cover connecting bolt hole; 503, circumferential external teeth; 6, end cover bearing body connecting piece;

[0026] a2, rotor thrust plate; a1-b1, bearing design axial clearance; δ, angle formed between the bearing bush thrust surface 402 and the rotor thrust plate a2 when the thrust bearing is in working state; DETAILED DESCRIPTION

[0027] Specific implementation method 1: Combination Figures 1 to 4 The present embodiment is described. The present embodiment is an integral thrust pad bearing with adjustable wedge angle, which includes a bearing body 1, an adjustment pad 2, a support block 3, a thrust pad 4, an end cover 5 and a plurality of end cover-bearing body connectors 6. The bearing body 1 is a hollow rotating body structure. A coaxially arranged annular groove 101 is processed on one end face of the bearing body 1. The adjustment pad 2, the support block 3, the thrust pad 4 and the end cover 5 are all annular structures. The support block 3 and the adjustment pad 2 are coaxially embedded in the annular groove 101 from the outside to the inside in sequence. A convex spherical surface 301 is processed on the side of the support block 3 away from the adjustment pad 2. A thrust pad 4 is provided on the outside of the support block 3. The thrust pad 4 is close to the support block 3. A concave spherical surface 401 matching the convex spherical surface 301 is processed on one side of the support block 3, and a coaxially arranged circumferential convex edge is also provided on the side of the thrust washer 4 close to the support block 3. An end cover 5 is provided on the outer side of the thrust washer 4, and an end cover connecting flange is provided on the side of the end cover 5 close to the bearing body 1. A coaxially arranged bearing body connecting flange is provided on the side of the bearing body 1 close to the end cover 5. The bearing body connecting flange is detachably connected to the end cover connecting flange through a plurality of end cover-bearing body connectors 6. A coaxially arranged circumferential rib 501 is provided on the side of the end cover 5 away from the thrust washer 4, and the circumferential rib 501 is located on the outer side of the circumferential convex edge of the thrust washer 4.

[0028] The integral thrust bush bearing with adjustable wedge angle described in the present invention has adjustable axial dimensions, easy thrust surface processing and production, and is suitable for variable working conditions.

[0029] Specific implementation method 2: Combination Figures 1 to 4 To explain this embodiment, the adjustment pad 2 of this embodiment includes a plurality of gaskets, which are coaxially installed in the annular groove 101 of the bearing body 1 from front to back along the axial direction of the thrust bearing. In this way, the adjustment pad 2 is composed of a plurality of gaskets, and the number and thickness of the gaskets can be freely matched. By adjusting the thickness of each gasket and the number of gaskets, the axial distance between the two thrust surfaces of the thrust bearing can be adjusted. The other components and connection relationships are the same as those of the specific embodiment 1.

[0030] Specific implementation method three: Combination Figures 1 to 4To explain this embodiment, the convex spherical surface 301 of the support block 3 of this embodiment has the same radius and relative position to the center of the sphere as the concave spherical surface 401 of the thrust washer 4, and the convex spherical surface 301 and the concave spherical surface 401 are completely fitted and arranged to rotate relative to each other. In this arrangement, the convex spherical surface 301 and the concave spherical surface 401 have the same radius and relative position to the center of the sphere, and the two are completely fitted and can rotate relative to each other. Other components and connection relationships are the same as those of the first or second specific embodiments.

[0031] Specific implementation method four: Combination Figures 1 to 4 To explain this embodiment, the thrust pad 4 of this embodiment is processed with a bearing pad thrust surface 402 on the side away from the adjustment pad 2, the bearing pad thrust surface 402 is a plane, and a plurality of radially arranged oil grooves are evenly processed on the bearing pad thrust surface 402 along the circumferential direction, and the first and last ends of the oil grooves are respectively connected with the inner and outer side surfaces of the thrust pad 4. Other components and connection relationships are the same as those of the specific embodiments one, two or three.

[0032] Specific implementation method five: Combination Figures 1 to 4 To explain this embodiment, the thrust washer 4 of this embodiment is processed with a plurality of circumferential outer teeth 403 evenly arranged along the circumferential direction on the outer side of the thrust washer 4, and the inner side of the end cover 5 is processed with a plurality of circumferential outer teeth 503 evenly arranged along the circumferential direction, and the plurality of circumferential outer teeth 403 mesh with the plurality of circumferential outer teeth 503. In this way, after the circumferential outer teeth 403 and the circumferential outer teeth 503 are assembled, they are completely nested and assembled together, limiting the circumferential position of the thrust washer 4. Other components and connection relationships are the same as those of the specific embodiments one, two, three or four.

[0033] In this embodiment, the circumferential external teeth 403 and the circumferential external teeth 503 have the same number of teeth and module and can be completely nested and assembled together.

[0034] Specific implementation method six: Combination Figures 1 to 4 This embodiment is described. After the circumferential outer teeth 403 and the circumferential outer teeth 503 of this embodiment are assembled, the tooth side clearance is 0.3-0.5 mm. With such a configuration, the tooth side clearance is maintained between 0.3-0.5 mm after assembly, which meets the requirements of the relative sliding freedom of the thrust pad 4 and the support block 3, and is the key to the wedge angle formed between the thrust pad 4 and the rotor thrust surface. The other components and connection relationships are the same as those of the specific embodiments 1, 2, 3, 4 or 5.

[0035] Specific implementation method seven: Combination Figures 1 to 4To explain this embodiment, the outer diameter of the thrust washer 4 of this embodiment is φ1, the inner diameter of the circumferential rib 501 of the end cover 5 is φ2, and the outer diameter of the circumferential convex edge of the thrust washer 4 is φ3, φ1<φ2<φ3. With such a configuration, after the bearing is assembled, the thrust washer 4 is axially limited by the cooperation between the circumferential rib 501 of the end cover 5 and the circumferential convex edge of the thrust washer 4. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five or six.

[0036] Specific implementation method eight: Combination Figures 1 to 4 To explain this embodiment, the end cover 5 of this embodiment is made of spring steel material. In this way, the end cover 5 is made of spring steel material and has the ability to elastically deform. The end cover 5 is deformed by the spring steel material to meet the relative sliding freedom requirements of the thrust pad 4 and the support block 3. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six or seven.

[0037] Specific implementation method nine: Combination Figures 1 to 4 This embodiment is described. The end cover-bearing body connector 6 of this embodiment is a bolt. The bearing body connection flange is uniformly provided with a plurality of bearing body connection bolt holes 102 along the circumferential direction. The end cover connection flange is uniformly provided with a plurality of end cover connection bolt holes 502 along the circumferential direction. The plurality of bearing body connection bolt holes 102 are arranged one by one with the plurality of end cover connection bolt holes 502. The bearing body connection flange is connected to the end cover connection flange by a plurality of bolts. With such a configuration, after the bearing body 1, the adjustment pad 2, the support block 3, the thrust washer 4 and the end cover 5 are assembled in sequence, they are tightened by bolts. The concave spherical surface 401 of the thrust washer 4 and the convex spherical surface 301 of the support block 3 are completely fitted and can rotate relative to each other. The circumferential outer teeth 403 of the thrust washer 4 are completely embedded in the circumferential outer teeth 503 of the end cover 5. The circumferential retaining edge 501 of the end cover 5 blocks the outer side of the circumferential outer teeth 403 of the thrust washer 4. The other components and connection relationships are the same as those of the first, second, third, fourth, fifth, sixth, seventh or eighth specific embodiments.

[0038] How it works

[0039] Combination Figures 1 to 4 The working principle of the integral thrust bearing with adjustable wedge angle described in the present invention is described as follows:

[0040] In this example, the bearing force direction is fixed, so only one side of the thrust bearing adopts the thrust plate structure of the present invention, and the other side adopts the fixed thrust plate structure. According to the operating conditions and design requirements, the fixed side thrust plate structure can also be changed to the structure of the present invention.

[0041] like Figure 3As shown, when the rotor is not running, the thrust bearing is in a free state. At this time, the thrust surface 402 of the bearing is parallel to the rotor thrust plate a2 without an angle. The axial clearance a1-b1 of the bearing design can be adjusted by changing the number and thickness of the gaskets of the adjustment pad 2. In the free state, the end cover 5 does not deform.

[0042] like Figure 4 As shown, after the rotor is running, the thrust bearing is in the working state. At this time, the convex spherical surface 301 and the concave spherical surface 401 rotate relative to each other, so that the thrust surface 402 of the bearing bush and the rotor thrust plate a2 form an angle δ, which meets the conditions for the formation of the dynamic pressure oil film. The circumferential rib 501 of the end cover 5 can meet the relative rotation freedom requirements of the support block 3 and the thrust bush 4 through elastic deformation.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integral thrust pad bearing with adjustable wedge angle, characterized in that: The invention comprises a bearing body (1), an adjustment pad (2), a support block (3), a thrust washer (4), an end cover (5) and a plurality of end cover-bearing body connecting parts (6); the bearing body (1) is a hollow rotating body structure; a coaxially arranged annular groove (101) is processed on one end face of the bearing body (1); the adjustment pad (2), the support block (3), the thrust washer (4) and the end cover (5) are all annular structures; the support block (3) and the adjustment pad (2) are coaxially embedded in the annular groove (101) in sequence from the outside to the inside; a convex spherical surface (301) is processed on the side of the support block (3) away from the adjustment pad (2); a thrust washer (4) is arranged on the outside of the support block (3); and a thrust washer (4) is processed on the side close to the support block (3). A concave spherical surface (401) is provided to match the convex spherical surface (301); a coaxially arranged circumferential convex edge is provided on the side of the thrust washer (4) close to the support block (3); an end cover (5) is provided on the outer side of the thrust washer (4); an end cover connecting flange is provided on the side of the end cover (5) close to the bearing body (1); a coaxially arranged bearing body connecting flange is provided on the side of the bearing body (1) close to the end cover (5); the bearing body connecting flange is detachably connected to the end cover connecting flange via a plurality of end cover-bearing body connectors (6); a coaxially arranged circumferential rib (501) is provided on the side of the end cover (5) away from the thrust washer (4); the circumferential rib (501) is located on the outer side of the circumferential rib of the thrust washer (4).

2. The integral thrust pad bearing with adjustable wedge angle according to claim 1, characterized in that: The adjustment pad (2) comprises a plurality of gaskets, which are coaxially installed in the annular groove (101) of the bearing body (1) in sequence from front to back along the axial direction of the thrust bearing.

3. The integral thrust pad bearing with adjustable wedge angle according to claim 2, characterized in that: The convex spherical surface (301) of the support block (3) and the concave spherical surface (401) of the thrust pad (4) have the same radius and the same relative position to the sphere center. The convex spherical surface (301) and the concave spherical surface (401) are completely fitted and arranged to rotate relative to each other.

4. The integral thrust pad bearing with adjustable wedge angle according to claim 3, characterized in that: A bearing bush thrust surface (402) is processed on the side of the thrust bush (4) away from the adjustment pad (2); the bearing bush thrust surface (402) is a plane; a plurality of radially arranged oil grooves are evenly processed on the bearing bush thrust surface (402) along the circumferential direction; the first and last ends of the oil grooves are respectively connected to the inner and outer side surfaces of the thrust bush (4).

5. The integral thrust pad bearing with adjustable wedge angle according to claim 4, characterized in that: The thrust bearing is processed along the outer side with a plurality of circumferential external teeth (403) evenly arranged in the circumferential direction, and the inner side surface of the end cover (5) is processed along the circumferential direction with a plurality of circumferential external teeth (503) evenly arranged in the circumferential direction, and the plurality of circumferential external teeth (403) mesh with the plurality of circumferential external teeth (503).

6. The integral thrust pad bearing with adjustable wedge angle according to claim 5, characterized in that: After the circumferential outer teeth (403) and the circumferential outer teeth (503) are assembled, the tooth side clearance is 0.3 to 0.5 mm.

7. The integral thrust pad bearing with adjustable wedge angle according to claim 6, characterized in that: The outer diameter of the thrust washer (4) is φ1, the inner diameter of the circumferential rib (501) of the end cover (5) is φ2, the outer diameter of the circumferential convex edge of the thrust washer (4) is φ3, and φ1<φ2<φ3.

8. The integral thrust pad bearing with adjustable wedge angle according to claim 7, characterized in that: The end cover (5) is made of spring steel material.

9. The integral thrust pad bearing with adjustable wedge angle according to claim 8, characterized in that: The end cover-bearing body connecting member (6) is a bolt, a plurality of bearing body connecting bolt holes (102) are evenly arranged on the bearing body connecting flange along the circumferential direction, a plurality of end cover connecting bolt holes (502) are evenly arranged on the end cover connecting flange along the circumferential direction, the plurality of bearing body connecting bolt holes (102) and the plurality of end cover connecting bolt holes (502) are arranged in a one-to-one correspondence, and the bearing body connecting flange is connected to the end cover connecting flange by a plurality of bolts.

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