Oil injection structure of shaft and bearing bush

Abstract

The bearing shell comprises an inner wall face located on the radial inner side, a plurality of tilting pads are installed on the inner wall face in an inserted mode, the tilting pads are distributed in the circumferential direction of the inner wall face, each tilting pad comprises a pad body and a spherical cushion block, and the main shaft is located on the inner side of the pad bodies. A gap is formed between the outer wall of the spindle and the inner wall of the tile block body, an oil injection component is further inserted into the inner wall face, a second oil channel is formed in the oil injection component, the oil injection component comprises an oil injection hole and an oil injection component oil inlet hole, the second oil channel is communicated with the oil injection hole, the oil injection hole is located in the outer side of the radial outer wall of the spindle, and the gap comprises an oil inlet edge. The oil inlet edge is located between the circumferential end of the tile block body and the main shaft, and the oil spraying direction of the oil spraying holes points to the oil inlet edge and faces the rotating direction of the main shaft. The utility model provides an oil injection structure of a shaft and a bearing bush. The oil injection structure aims to solve the problem that the temperature of the bearing bush is high when the specific pressure is too high.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing bushes, in particular to an oil injection structure of a shaft and a bearing bush. Background Art

[0002] With the development of gas turbines and million-ton steam turbines, there are more and more high-speed and heavy-load operating parameters, but the bearing temperature requirement is still below 90°C. This is a problem for tilting pad bearings under large specific pressures, because at a linear speed of more than 60m / s, the bearing temperature of a specific pressure exceeding 2MPa will be higher than 90°C. However, due to the special nature of the installation space, the specific pressure of the gas turbine bearing often exceeds 2MPa, which means that the bearing temperature must exceed the customer's requirement of less than 90°C.

[0003] In the current tilting pad bearing, tilting pads are installed on the inner wall of the annular bearing housing. The tilting pads are evenly spaced along the circumferential direction of the inner wall of the bearing housing. The inner walls of multiple tilting pads are slidably connected to the outer wall of the rotating shaft. The friction and the pad temperature are reduced by injecting cold lubricating oil into the gap between the inner wall of the tilting pad and the outer wall of the rotating shaft. The nozzle with lubricating oil is located between the tilting pads, and the injection direction is aligned with the outer wall of the rotating shaft along the radial direction of the shaft body. This causes a large amount of lubricating oil to be directly rebounded by the rotating shaft and refluxed without entering the gap between the inner wall of the tilting pad and the outer wall of the rotating shaft, resulting in low cooling efficiency and poor cooling effect. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide an oil injection structure for a shaft and a bearing bush to solve the problem of high bush temperature caused by excessively high specific pressure.

[0005] The utility model discloses an oil injection structure for a shaft and a bearing bush, comprising a bearing housing and a main shaft. The bearing housing comprises an inner wall surface located on the radial inner side, a tilting pad is inserted and installed on the inner wall surface, a plurality of tilting pads are distributed circumferentially along the inner wall surface, the tilting pads comprise a pad body and a spherical pad, the main shaft is located inside the plurality of pad bodies, a gap is formed between the outer wall of the main shaft and the inner wall of the pad body, an oil injection component is also inserted and installed on the inner wall surface, an oil channel 2 is arranged in the oil injection component, and the oil injection component comprises an oil injection hole , an oil inlet hole of an oil injection component, oil passage two is connected to the oil injection hole, the oil injection hole is located on the outside of the radial outer wall of the main shaft, the gap includes an oil inlet edge, the oil inlet edge is located between one circumferential end of the shoe body and the main shaft, the oil injection direction of the oil injection hole points to the oil inlet edge, and the oil injection direction of the oil injection hole is toward the rotation direction of the main shaft; the bearing housing is provided with an oil inlet channel, the oil inlet channel includes an inlet end and an outlet end, the inlet end passes through the outer wall of the bearing housing and is connected to the external oil circuit, and the outlet end is connected to the oil inlet hole of the oil injection component of oil passage two through oil passage one.

[0006] Furthermore, the bearing housing also includes an end face 1 located at one axial end, an oil seal 1 is installed on the end face 1, and the bearing housing is provided with a groove body, the groove body forms an opening on the end face 1, and the oil seal 1 closes the opening to form an oil channel 1 between the oil seal 1 and the groove body.

[0007] Furthermore, the oil injection component also includes oil rod 1 and oil rod 2. Oil rod 2 is inserted into oil rod 1 and fixedly connected. Oil rod 2 is inserted into the inner wall surface and fixedly connected to the bearing housing. Oil rod 1 is located radially inside the inner wall surface.

[0008] Furthermore, oil channel 2 includes chamber 1 and chamber 2, chamber 1 is located in oil rod 1, chamber 2 is located in oil rod 2, chamber 1 and chamber 2 are interconnected, the oil injection hole is connected to chamber 1, the oil injection component oil inlet hole is connected to chamber 2, and the bearing housing is provided with a connecting channel, which respectively connects the oil injection component oil inlet hole and oil channel 1.

[0009] Furthermore, the oil inlet channel also includes channel 1 and channel 2, which are interconnected. Channel 1 passes through the outer wall of the bearing housing and one end of the channel is the inlet end, while channel 2 is connected to oil channel 1 and the connected end is the outlet end.

[0010] Furthermore, a bushing is sleeved on the outer wall of the bearing housing, the bushing is fixedly connected to the bearing housing, and the bushing is provided with an oil inlet hole, which is connected to the inlet end.

[0011] Furthermore, the bearing housing also includes an end face 2 located at the other axial end, and an oil seal 2 is installed on the end face 2. The oil seal 2 is provided with an oil return port 2, and the oil return port 2 radially penetrates the oil seal 2. The oil seal 1 is provided with an oil return port 1, and the oil return port 1 radially penetrates the oil seal 1.

[0012] Furthermore, an axial direction of the oil rod is arranged along the axial direction of the bearing housing, and a plurality of oil injection holes are provided and distributed at intervals along the axial direction of the oil rod.

[0013] The first cavity is provided with an interface one, the second cavity is provided with an interface two, and the interface one is connected with the interface two.

[0014] Beneficial effects of the utility model:

[0015] The oil spraying direction of the oil spray hole points to the gap, and the oil spraying direction of the oil spray hole is toward the rotation direction of the main shaft. The cooling oil sprayed from the oil spray hole is injected into the gap. Since the oil spraying direction of the oil spray hole forms an acute angle with the radial direction of the main shaft, the amount of cooling oil directly rebounding from the outer wall of the main shaft is reduced, and more cooling oil can enter the gap to cool the main shaft and the main body of the bearing block and provide lubrication, so as to solve the problem of high bearing block temperature caused by excessive specific pressure. After actual working condition testing, the bearing temperature reduction range is 3℃-5℃. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of an embodiment;

[0017] Figure 2 An exploded view of an embodiment;

[0018] Figure 3 is a cross-sectional view of an embodiment;

[0019] Figure 4 A three-dimensional cutaway view of an embodiment;

[0020] Figure 5 A second perspective cutaway view of an embodiment;

[0021] Figure 6 A three-dimensional diagram of the oil injection component in the embodiment;

[0022] Figure 7 is a cross-sectional view of the fuel injection component in the embodiment;

[0023] Figure 8 It is a schematic diagram of the positional relationship between the oil injection component, the main shaft, and the shoe body in the embodiment;

[0024] Fig. 9 Figure 8 Enlarged view of point A in the middle.

[0025] Figure numerals: sleeve 1, oil inlet hole 11, bearing housing 2, oil inlet channel 21, channel one 211, channel two 212, inlet end 213, outlet end 214, groove body 22, oil channel one 23, end face one 24, end face two 25, connecting channel 26, inner wall surface 27, shoe body 3, oil injection component 4, oil rod one 41, oil rod two 42, oil channel two 43, cavity one 431, interface one 4311, cavity two 432, interface two 4321, oil injection hole 433, oil injection component oil inlet hole 434, oil seal one 5, oil return port one 51, oil seal two 6, oil return port two 61, main shaft 7, gap 8, oil inlet edge 81. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in this embodiment to clearly and completely describe the technical solution in this embodiment. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] like Figure 1-Figure 9 As shown, a shaft and bearing oil injection structure includes a bearing housing 2, such as Figure 1 , Figure 2 As shown, the bearing housing 2 is a circular ring structure, and the bearing housing 2 is formed by splicing two semicircular rings. Figure 3The outer wall of the bearing housing 2 is covered with a sleeve 1, which is also an annular structure. The sleeve 1 is fixedly connected to the bearing housing 2 inside and outside. Figure 4 The bushing sleeve 1 is provided with an oil inlet hole 11, which passes through the side wall of the bushing sleeve 1. The oil inlet hole 11 is connected to an external oil circuit and can allow cooling oil to flow into it.

[0028] like Figure 4 As shown, the bearing housing 2 includes an inner wall surface 27 located radially inward, the inner wall surface 27 is annular, and a tile is inserted and installed on the inner wall surface 27. Figure 1 There are 4 tiles evenly distributed along the inner wall surface 27. The tiles include a tile body 3 and a spherical pad. One side of the spherical pad is connected to the tile body 3, and the other side is connected to the inner wall surface 27. The tile body 3 is an arc-shaped tile-like structure. The tile body 3 is located radially inside the inner wall surface 27. The tile bodies 3 are evenly spaced along the inner wall surface 27. The inner wall surface of the tile body 3 is an arc shape. The inner wall surfaces of the four tile bodies 3 are on the same virtual ring. Figure 8 The inner wall surface of the four tile bodies 3 is slidably connected with a main shaft 7, the outer wall of the main shaft 7 is clearance-matched with the inner wall surface of the tile body 3, and the main shaft 7 is inside the plurality of tile bodies 3, such as Fig. 9 As shown, a gap 8 is formed between the outer wall of the main shaft 7 and the inner wall of the pad body 3. When the main shaft 7 rotates at a high speed, cooling oil is introduced into the gap 8 to reduce the temperature of the main shaft 7 and the pad body 3, thereby improving the operating environment of the main shaft 7 and increasing the service life of the main shaft 7 and the pad body 3. The gap 8 includes an oil inlet edge 81, which is located between one circumferential end of the pad body 3 and the main shaft 7.

[0029] like Figure 5 As shown, the inner wall surface 27 is also inserted with the oil injection component 4. Figure 6 , Figure 7 The oil injection component 4 is a T-shaped structure, and includes an oil rod 1 41 and an oil rod 2 42. The oil rod 1 41 is the "1" part of the T-shaped structure, and the oil rod 2 42 is the "1" part of the T-shaped structure. The oil rod 2 42 is inserted into the oil rod 1 41 and fixedly connected. The oil rod 2 42 is inserted into the inner wall surface 27 and fixedly connected to the bearing housing 2. The oil rod 1 41 is located radially inside the inner wall surface 27 and between two adjacent shoe bodies 3. The oil rod 1 41 is axially arranged along the axial direction of the bearing housing 2.

[0030] like Figure 7 As shown, a cavity 431 is provided in the oil rod 41, and the cavity 431 includes an interface 4311. The oil rod 42 is provided with a cavity 432, and the cavity 432 includes an interface 4321. The interface 4311 of the cavity 431 is connected with the interface 4321 of the cavity 432, so that the cavity 431 is connected with the cavity 432 and forms the oil passage 43.

[0031] The second oil rod 42 is also provided with an oil injection component oil inlet hole 434, which is located on the side of the second oil rod 42 away from the second interface 4321, and the oil injection component oil inlet hole 434 passes through the side wall of the second oil rod 42. The first oil rod 41 is also provided with a plurality of oil injection holes 433, which are provided in plurality and distributed at intervals along the axial direction of the first oil rod 41, and the second oil passage 43 is only connected to the outside at the oil injection hole 433 and the oil injection component oil inlet hole 434.

[0032] Combination Figure 6 One end of the oil injection hole 433 passes through the side wall of the oil rod 41, and the other end is connected to the cavity 431. Fig. 9 As shown, the oil injection hole 433 is located on the outside of the radial outer wall of the main shaft 7, and the oil injection direction Q of the oil injection hole 433 points to the oil inlet edge 81 of the gap 8, and the oil injection direction Q of the oil injection hole 433 is toward the rotation direction P of the main shaft 7. The cooling oil sprayed from the oil injection hole 433 is injected into the gap 8. Since the oil injection direction Q of the oil injection hole 433 forms an acute angle with the radial direction of the main shaft 7, the amount of cooling oil directly rebounding from the outer wall of the main shaft 7 is reduced, and more cooling oil can enter the gap 8 to cool the main shaft 7 and the shoe body 3.

[0033] like Figure 4 As shown, the bearing housing 2 also includes an end face 24 located at one axial end. The bearing housing 2 is provided with a groove 22. The groove 22 forms an opening on the end face 24. The groove 22 is an annular structure coaxial with the bearing housing 2. The end face 24 is installed with an oil seal 5. Figure 1 , Figure 2 The oil seal 5 is an annular structure, and the end face 24 is fitted and fixed to the end face of the oil seal 5, so that the oil seal 5 closes the opening of the groove body 22 on the end face 24, thereby forming an annular oil passage 23 between the oil seal 5 and the groove body 22.

[0034] Combination Figure 1 , Figure 3 The oil seal 5 is provided with an oil return port 51, which penetrates the oil seal 5 in the radial direction of the oil seal 5, and the oil return port 51 extends from the inner hole wall of the oil seal 5 to the outer wall, such as Figure 1 As shown, when the cooling oil sprayed from the oil spray hole 433 flows to the inner hole of the oil seal 5, it can flow out through the oil return port 51 to form oil return.

[0035] The bearing housing 2 also includes an end face 25 located at the other axial end, and an oil seal 6 is installed on the end face 25. The oil seal 6 is also an annular structure and is fixed to the end face 25. The oil seal 6 is provided with an oil return port 61. The oil return port 61 penetrates the oil seal 6 radially. The function of the oil return port 61 is the same as that of the oil port 1 51.

[0036] like Figure 5As shown, the bearing housing 2 is provided with a connecting channel 26, one axial end of the connecting channel 26 is connected to the wall of the groove body 22 along the axial direction of the bearing housing 2, and the other end extends to the oil inlet hole 434 of the oil injection component, so that the connecting channel 26 is connected with the oil channel 2 43, and the oil channel 1 23 is used to supply oil to each oil channel 2 43.

[0037] like Figure 4 As shown, the bearing housing 2 is provided with an oil inlet channel 21, and the oil inlet channel 21 includes a hole 1 211 and a hole 212. The hole 1 211 is radially recessed and extends inward along the outer wall of the bearing housing 2 to form a countersunk hole, and the hole 212 extends from the wall of the groove body 22 to the hole 1 211. The hole 1 211 and the hole 212 are interconnected, so that the oil inlet channel 21 is connected with the oil channel 1 23, and the oil inlet channel 21 supplies oil to the oil channel 1 23.

[0038] The oil inlet channel 21 also includes an inlet end 213 and an outlet end 214. The inlet end 213, i.e., the channel 1 211, passes through one end of the outer wall of the bearing housing 2. The inlet end 213 is connected to the oil inlet hole 11. The outlet end 214, i.e., the channel 2 212 is connected to the groove body 22. The cooling oil entering the oil inlet hole 11 flows into the oil inlet channel 21 through the inlet end 213, flows out from the outlet end 214 and enters the groove body 22, flows out from the groove body 22 and enters the connecting channel 26 and enters the oil channel 2 43 along the oil inlet hole 434 of the oil injection component, and finally is sprayed out from the oil injection hole 433. The sprayed cooling oil enters the gap 8 to cool the main shaft 7 and the block body 3.

[0039] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An oil injection structure for a shaft and a bearing shell, comprising a bearing housing (2) and a main shaft (7), wherein the bearing housing (2) comprises an inner wall surface (27) located radially inward, a tilting pad is inserted and installed on the inner wall surface (27), a plurality of tilting pads are circumferentially distributed along the inner wall surface (27), the tilting pads comprise a pad body (3) and a spherical pad, the main shaft (7) is located on the inner side of the plurality of pad bodies (3), a gap (8) is formed between the outer wall of the main shaft (7) and the inner wall of the pad body (3), and the invention is characterized in that: The inner wall surface (27) is also inserted with an oil injection component (4), and the oil injection component (4) is provided with a second oil passage (43). The oil injection component (4) includes an oil injection hole (433) and an oil injection component oil inlet hole (434). The second oil passage (43) is connected to the oil injection hole (433). The oil injection hole (433) is located outside the radial outer wall of the main shaft (7). The gap (8) includes an oil inlet edge (81). The oil inlet edge (81) is located between one circumferential end of the shoe body (3) and the main shaft (7). The oil injection direction of the oil injection hole (433) points to the oil inlet edge (81), and the oil injection direction of the oil injection hole (433) is toward the rotation direction of the main shaft (7). The bearing housing (2) is provided with an oil inlet passage (21), the oil inlet passage (21) comprising an inlet end (213) and an outlet end (214), the inlet end (213) leading out of the outer wall of the bearing housing (2) and connected to an external oil circuit, the outlet end (214) being connected to the oil inlet hole (434) of the oil injection component of the second oil passage (43) through the first oil passage (23).

2. The oil injection structure of a shaft and a bearing bush according to claim 1, characterized in that: The bearing housing (2) further comprises an end face (24) located at one axial end, an oil seal (5) being installed on the end face (24), the bearing housing (2) being provided with a groove body (22), the groove body (22) forming an opening on the end face (24), the oil seal (5) closing the opening, so that an oil passage (23) is formed between the oil seal (5) and the groove body (22).

3. The oil injection structure of a shaft and a bearing bush according to claim 1, characterized in that: The oil injection component (4) further comprises an oil rod 1 (41) and an oil rod 2 (42); the oil rod 2 (42) is inserted into the oil rod 1 (41) and fixedly connected; the oil rod 2 (42) is inserted into the inner wall surface (27) and fixedly connected to the bearing housing (2); the oil rod 1 (41) is located radially inward of the inner wall surface (27).

4. The oil injection structure of a shaft and a bearing bush according to claim 3, characterized in that: The oil passage 2 (43) comprises a cavity 1 (431) and a cavity 2 (432). The cavity 1 (431) is located in the oil rod 1 (41), and the cavity 2 (432) is located in the oil rod 2 (42). The cavity 1 (431) and the cavity 2 (432) are connected to each other. The oil injection hole (433) is connected to the cavity 1 (431), and the oil injection component oil inlet hole (434) is connected to the cavity 2 (432). The bearing housing (2) is provided with a connecting channel (26), and the connecting channel (26) is respectively connected to the oil injection component oil inlet hole (434) and the oil passage 1 (23).

5. The oil injection structure of a shaft and a bearing bush according to claim 1, characterized in that: The oil inlet passage (21) further comprises a hole channel 1 (211) and a hole channel 2 (212); the hole channel 1 (211) and the hole channel 2 (212) are connected to each other; one end of the hole channel 1 (211) passing through the outer wall of the bearing housing (2) is the inlet end (213); the hole channel 2 (212) is connected to the oil channel 1 (23) and the connecting end is the outlet end (214).

6. The oil injection structure of a shaft and a bearing bush according to claim 1, characterized in that: The outer wall of the bearing housing (2) is sleeved with a bushing (1), the bushing (1) is fixedly connected to the bearing housing (2), the bushing (1) is provided with an oil inlet hole (11), and the oil inlet hole (11) is connected to the inlet end (213).

7. The oil injection structure of a shaft and a bearing bush according to claim 2, characterized in that: The bearing housing (2) further comprises an end face 2 (25) located at the other axial end, the end face 2 (25) being provided with an oil seal 2 (6), the oil seal 2 (6) being provided with an oil return port 2 (61), the oil return port 2 (61) penetrating the oil seal 2 (6) in a radial direction, and the oil seal 1 (5) being provided with an oil return port 1 (51), the oil return port 1 (51) penetrating the oil seal 1 (5) in a radial direction.

8. The oil injection structure of a shaft and a bearing bush according to claim 3, characterized in that: The oil rod 1 (41) is axially arranged along the axial direction of the bearing housing (2), and a plurality of oil injection holes (433) are provided and are distributed at intervals along the axial direction of the oil rod 1 (41).

9. The oil injection structure of a shaft and a bearing bush according to claim 4, characterized in that: The cavity one (431) is provided with an interface one (4311), and the cavity two (432) is provided with an interface two (4321), and the interface one (4311) is connected to the interface two (4321).

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