A rotating body sealing structure

Abstract

This invention provides a rotating body sealing structure, including a bearing housing, an inner wall of which is connected to a mounting bearing, an inner wall of which is connected to the surface of a rotating body, an end cap on the side of the mounting bearing, and a skeleton oil seal between the end cap and the mounting bearing. An mounting groove is formed on the outer side of the skeleton oil seal, and an O-ring is placed in the groove. A bearing cavity is formed between the skeleton oil seal and the mounting bearing. A vent hole is formed in the bearing housing, and a quick-connect fitting is installed at the vent hole to inject compressed air into the bearing cavity. This invention replaces the traditional planar precision seal between the bearing housing and the end cap with an O-ring seal. Furthermore, by injecting compressed air into the bearing cavity through the vent hole, a slight positive pressure is created within the bearing cavity, preventing harmful gases from escaping to the outside through the skeleton oil seal.

Description

Technical Field

[0001] This utility model relates to the field of sealing structures, and in particular to a rotating body sealing structure. Background Technology

[0002] Rotating body seals are mainly divided into two categories: contact seals and non-contact seals. Contact seals (such as lip rings, mechanical seals, and packing) rely on the tight fit between the sealing element and the surface of the rotating shaft or end-face friction to block leakage. Their advantages are good sealing performance and high pressure resistance, but frictional wear and heat generation are unavoidable. Among them, mechanical seals, which use precision-ground dynamic and static ring end faces to fit together, are the first choice for high-pressure, high-speed, and high-risk media conditions. Non-contact seals (such as labyrinth seals and spiral seals) utilize narrow tortuous gaps or hydrodynamic effects to generate resistance, avoiding direct friction between solids. Their advantages are zero wear, long service life, and suitability for ultra-high-speed applications, but they usually have a small permissible leakage.

[0003] Traditional rotating body sealing structures typically use skeleton oil seals for sealing. After a period of operation, the skeleton oil seals are worn, and the sealing effect gradually weakens until they fail. Regular shutdowns are required to replace the seals, increasing labor costs, reducing production line capacity, and affecting economic benefits. More importantly, this structure cannot achieve a complete seal, and there will be slight gas leakage. The leakage of harmful gases will cause environmental pollution, and long-term work in this environment will affect the health of workers. Utility Model Content

[0004] This invention addresses the problems of traditional skeleton oil seals in the prior art, which are prone to wear and leakage, require frequent shutdowns for maintenance, and cause environmental pollution and health hazards due to leaked gas. It provides a rotating body sealing structure.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] This utility model provides a rotating body sealing structure, including a fixed frame and a rotating body, the fixed frame and the rotating body are rotatably connected, a bearing seat is installed on one side of the fixed frame, a mounting bearing is connected to the inner wall of the bearing seat, the inner side wall of the mounting bearing is connected to the surface of the rotating body, an end cover is provided on the side of the mounting bearing, and a skeleton oil seal is provided between the end cover and the mounting bearing.

[0007] The outer side of the skeleton oil seal is provided with an installation groove, and an O-ring is placed in the installation groove;

[0008] A bearing cavity is provided between the skeleton oil seal and the mounting bearing. The bearing seat has a vent hole, and a quick-connect fitting is installed at the vent hole to inject compressed air into the bearing cavity.

[0009] In this technical solution, the traditional planar precision seal between the bearing housing and the end cover is replaced with an O-ring seal. Furthermore, based on the original skeleton oil seal, compressed air is injected into the bearing cavity through the vent hole to create a slight positive pressure inside the bearing cavity. This prevents harmful gases from escaping to the outside through the skeleton oil seal, thus avoiding environmental pollution caused by harmful gas leakage. It also prevents workers from suffering health problems from working in an environment with harmful gas leakage for a long time.

[0010] Preferably, a bearing seat is detachably connected to one side of the fixing frame via multiple fixing bolts.

[0011] In this technical solution, the fixing frame and the bearing seat are connected by fixing bolts.

[0012] Preferably, the end cap is detachably connected to the side of the bearing housing by a plurality of mounting bolts.

[0013] In this technical solution, the end cover and bearing housing are connected by mounting bolts.

[0014] Preferably, the skeleton oil seal is detachably connected to the end cap by a plurality of disassembly bolts, and the lip of the skeleton oil seal is in contact with the surface of the rotating body.

[0015] In this technical solution, the skeleton oil seal and end cap are connected by disassembling the bolts.

[0016] Preferably, an mounting bearing and an auxiliary bearing are installed inside the end caps on both sides, and an auxiliary sealing unit is provided between the mounting bearing and the auxiliary bearing. The auxiliary sealing unit is installed inside the bearing housing and is in close contact with the surface of the rotating body.

[0017] The auxiliary sealing unit includes a central sealing component and a side sealing component, with side sealing components provided on both sides of the central sealing component.

[0018] In this technical solution, the sealing performance is further enhanced by an auxiliary sealing unit.

[0019] Preferably, the central sealing assembly includes two retaining rings, the outer sides of which are respectively connected to the inner wall of the bearing housing;

[0020] Both of the two fixed rings are connected to an arc-shaped sealing ring on opposite sides, and the inner side of the arc-shaped sealing ring is in contact with the surface of the rotating body.

[0021] The two fixed rings, the two arc-shaped sealing rings, the surface of the rotating body, and the inner wall of the bearing seat form a closed cavity. The bearing seat is provided with a material passage hole at the position above the closed cavity. A control connector is installed in the material passage hole, and sealing fluid is introduced into the closed cavity.

[0022] In this technical solution, liquid sealing is achieved through a central sealing assembly.

[0023] Preferably, the outer side of the arc-shaped sealing ring is connected to two symmetrically distributed elastic clamping rings, and a medium elastic ring is embedded in the two elastic clamping rings.

[0024] In this technical solution, the adhesion between the arc-shaped sealing ring and the surface of the rotating body is improved by using a medium elastic ring.

[0025] Preferably, each of the two arc-shaped sealing rings is connected to a reinforcing ring on the side away from the fixed ring, and the outer side of the reinforcing ring is connected to the inner wall of the bearing housing.

[0026] In this technical solution, the structural strength of the arc-shaped sealing ring and the fixing ring is increased by reinforcing rings.

[0027] Preferably, the edge sealing assembly includes an inner sealing ring and an outer sealing ring, the inner side of the inner sealing ring is in contact with the surface of the rotating body, and an M-shaped sealing ring is connected to the outer side of the inner sealing ring;

[0028] An outer elastic ring is installed in the space between the M-type sealing ring and the inner sealing ring. A Y-type sealing ring is connected to the outer side of the M-type sealing ring. The outer side of the Y-type sealing ring is connected to the inner side of the outer sealing ring. An inner elastic ring is installed in the space between the M-type sealing ring and the Y-type sealing ring.

[0029] In this technical solution, the sealing performance of the sealing structure is further improved by using a side sealing component.

[0030] Preferably, two symmetrically distributed blocking components are connected between the outer side of the outer sealing ring and the inner side of the bearing housing. The blocking components include an inner trapezoidal ring and an outer trapezoidal ring. The inner side of the inner trapezoidal ring is connected to the outer side of the outer sealing ring. An outer trapezoidal ring is provided on both sides of the inner trapezoidal ring. The outer side of the outer trapezoidal ring is connected to the inner side of the bearing housing.

[0031] The inner trapezoidal ring and the outer trapezoidal ring have multiple stepped rings connected to their adjacent sides.

[0032] In this technical solution, the sealing performance between the outer sealing ring and the bearing housing is ensured by the blocking component.

[0033] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0034] The positive and progressive effects of this utility model are as follows:

[0035] This utility model replaces the traditional planar precision seal between the bearing housing and the end cover with an O-ring seal. In addition, based on the original skeleton oil seal, compressed air is injected into the bearing cavity through the vent hole to create a slight positive pressure in the bearing cavity, preventing harmful gases from escaping to the outside through the skeleton oil seal, thus avoiding environmental pollution caused by harmful gas leakage. It also avoids the health impact on workers who work in an environment with harmful gas leakage for a long time.

[0036] Meanwhile, the amount of injected gas can be adjusted according to the internal pressure status. Even if the skeleton oil seal is slightly worn, it will not affect its sealing effect. There is no need to frequently stop the machine to replace the sealing structure, which can improve the production line capacity, avoid increasing labor costs, and improve economic efficiency. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the rotating body sealing structure according to an embodiment of the present invention.

[0038] Figure 2 for Figure 1 The diagram shows the overall internal structure of the rotating body sealing structure.

[0039] Figure 3 for Figure 2 A partially enlarged schematic diagram of point A of the rotating body sealing structure shown.

[0040] Figure 4 for Figure 1 The diagram shows the internal structure of the auxiliary bearing and auxiliary sealing unit of the rotating body sealing structure.

[0041] Figure 5 for Figure 4 The diagram shows a partially enlarged view of section B of the rotating body sealing structure.

[0042] Figure 6 for Figure 4 The diagram shows a three-dimensional structure of the bearing housing, auxiliary bearing, and auxiliary sealing unit of the rotating body sealing structure.

[0043] Figure 7 for Figure 6 The diagram shows a cross-sectional view of the bearing housing, auxiliary bearing, and auxiliary sealing unit of the rotating body sealing structure.

[0044] Figure 8 for Figure 6 A three-dimensional structural diagram of the blocking component of the rotating body sealing structure is shown.

[0045] Figure 9 for Figure 8 The diagram shows a cross-sectional view of the blocking component of the rotating body sealing structure.

[0046] Explanation of reference numerals in the attached figures

[0047] 1. Fixed frame; 2. Rotating body; 3. Bearing housing; 4. Fixing bolt; 5. Bearing mounting; 6. Mounting bolt; 7. End cap; 8. Removal bolt; 9. Oil seal; 10. O-ring; 11. Bearing cavity; 12. Vent hole; 13. Quick connector;

[0048] 14. Auxiliary bearings;

[0049] 15. Central sealing assembly; 151. Retaining ring; 152. Arc-shaped sealing ring; 153. Material passage hole; 154. Control connector; 155. Central elastic ring; 156. Elastic clamping ring; 157. Reinforcing ring;

[0050] 16. Side sealing assembly; 161. Inner sealing ring; 162. Outer sealing ring; 163. M-type sealing ring; 164. Outer elastic ring; 165. Inner elastic ring; 166. Y-type sealing ring; 167. Connecting spring;

[0051] 17. Blocking assembly; 171. Inner trapezoidal ring; 172. Outer trapezoidal ring; 173. Stepped ring; 174. Triangular ring. Detailed Implementation

[0052] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0053] Figures 1 to 9 The diagram shown is a structural schematic of an embodiment of the rotating body sealing structure of this utility model.

[0054] Example 1

[0055] Figures 1 to 3 As shown, a rotating body sealing structure includes a fixed frame 1 and a rotating body 2, which are rotatably connected. A bearing seat 3 is installed on one side of the fixed frame 1, and a mounting bearing 5 is connected to the inner wall of the bearing seat 3. The inner side wall of the mounting bearing 5 is connected to the surface of the rotating body 2. An end cover 7 is provided on the side of the mounting bearing 5, and a skeleton oil seal 9 is provided between the end cover 7 and the mounting bearing 5.

[0056] The outer side of the skeleton oil seal 9 is provided with an installation groove, and an O-ring 10 is placed in the installation groove;

[0057] A bearing cavity 11 is provided between the skeleton oil seal 9 and the mounting bearing 5. The bearing seat 3 has a vent hole 12, and a quick connector 13 is installed at the vent hole 12 to inject compressed air into the bearing cavity 11 through the vent hole 12.

[0058] The introduced compressed air can create a slight positive pressure inside the bearing cavity 11, preventing harmful gases from escaping to the outside through the skeleton oil seal.

[0059] The bearing cavity 11 is equipped with a pressure detection instrument. The pressure detection instrument is used to detect the pressure value inside the bearing cavity 11. The amount of gas injected can be adjusted according to the internal pressure state. Even if the skeleton oil seal 9 is slightly worn, it will not affect its sealing effect and there is no need to frequently stop the machine to replace it.

[0060] The traditional planar precision seal between the bearing housing 3 and the end cover 7 is replaced with an O-ring 10 seal. In addition, based on the original skeleton oil seal 9, compressed air is injected into the bearing cavity 11 through the vent 12 to create a slight positive pressure in the bearing cavity 11, so that harmful gases cannot escape to the outside through the skeleton oil seal 9, thus avoiding environmental pollution caused by harmful gas leakage. It can also prevent workers from working in an environment with harmful gas leakage for a long time and causing health problems.

[0061] Meanwhile, the amount of injected gas can be adjusted according to the internal pressure status. Even if the skeleton oil seal 9 is slightly worn, it will not affect its sealing effect. There is no need to frequently stop the machine to replace the sealing structure, which can improve the production line capacity, avoid increasing labor costs, and improve economic efficiency.

[0062] The bearing seat 3 is detachably connected to one side of the fixed frame 1 by multiple fixing bolts 4.

[0063] The fixing bracket 1 and the bearing seat 3 are connected by fixing bolt 4.

[0064] Multiple fixing bolts 4 are arranged in a ring array.

[0065] The bearing housing 3 is used to support and mount the bearing 5, and the bearing hole for mounting the bearing 5 provides a precise mounting position for mounting the outer ring of the bearing 5.

[0066] The bearing 5 bears all the radial and axial forces transmitted from the rotating body 2;

[0067] The mounting bolts 6, end caps 7, and rotating body 2 work together to form a closed space for storing grease or lubricating oil.

[0068] In addition, the bearing 5 can also bear and transmit loads, and provide a basis for installation and maintenance.

[0069] The end cap 7 is detachably connected to the side of the bearing housing 3 by multiple mounting bolts 6.

[0070] The end cap 7 and bearing housing 3 are connected by mounting bolt 6.

[0071] Multiple mounting bolts 6 are arranged in a circular array.

[0072] The boss or stop inside the end cover 7 directly abuts against the outer ring end face of the bearing. The end cover 7 and the shoulder inside the bearing housing 3 cooperate to clamp the bearing 5 in the correct position, ensuring that the bearing 5 will not be displaced when subjected to axial load.

[0073] End cap 7 can prevent external dust, water, cutting fluid and other impurities from entering the bearing chamber, and prevent the bearing 5 from being worn or seized due to contaminants;

[0074] At the same time, the grease or lubricating oil required for the operation of bearing 5 is sealed inside bearing housing 3 to prevent it from being thrown out, thus ensuring lubrication and keeping the equipment clean.

[0075] The skeleton oil seal 9 is detachably connected to the end cap 7 by multiple disassembly bolts 8, and the lip of the skeleton oil seal 9 is in contact with the surface of the rotating body 2.

[0076] Connect the skeleton oil seal 9 and the end cap 7 by removing bolt 8.

[0077] The skeleton oil seal 9 prevents the leakage of grease or lubricating oil inside the bearing and prevents external dust and moisture from entering.

[0078] Example 2

[0079] As one embodiment of this application, such as Figures 4 to 9 As shown, the difference between it and Embodiment 1 is that the end caps 7 on both sides are equipped with mounting bearings 5 ​​and auxiliary bearings 14, and an auxiliary sealing unit is provided between the mounting bearings 5 ​​and auxiliary bearings 14. The auxiliary sealing unit is installed inside the bearing seat 3 and is in close contact with the surface of the rotating body 2.

[0080] The auxiliary sealing unit includes a central sealing assembly 15 and a side sealing assembly 16, with side sealing assemblies 16 provided on both sides of the central sealing assembly 15.

[0081] The sealing performance is further enhanced by an auxiliary sealing unit.

[0082] The central sealing assembly 15 includes two retaining rings 151, the outer sides of which are respectively connected to the inner wall of the bearing housing 3;

[0083] Both fixed rings 151 are connected to an arc-shaped sealing ring 152 on opposite sides, and the inner side of the arc-shaped sealing ring 152 is in contact with the surface of the rotating body 2.

[0084] Two fixed rings 151, two arc-shaped sealing rings 152, the surface of the rotating body 2 and the inner wall of the bearing seat 3 form a closed cavity. The bearing seat 3 is provided with a material passage hole 153 at the position above the closed cavity. A control connector 154 is installed in the material passage hole 153. Sealing fluid is introduced into the closed cavity.

[0085] Liquid sealing is achieved through the central sealing assembly 15, which, in conjunction with the gas seal at the bearing cavity 11, further improves the sealing performance of the sealing structure and is applicable to more models of rotating bodies 2.

[0086] The sealing fluid is a liquid such as oil that can provide a seal.

[0087] Two symmetrically distributed elastic clamping rings 156 are connected to the outer side of the arc-shaped sealing ring 152, and a middle elastic ring 155 is embedded in the two elastic clamping rings 156.

[0088] The elastic ring 155 increases the contact strength between the arc-shaped sealing ring 152 and the surface of the rotating body 2, making the arc-shaped sealing ring 152 fit tightly against the rotating body 2 and increasing the sealing performance of the central sealing assembly 15.

[0089] Each of the two arc-shaped sealing rings 152 is connected to a reinforcing ring 157 on the side away from the fixed ring 151, and the outer side of the reinforcing ring 157 is connected to the inner wall of the bearing housing 3.

[0090] The structural strength of the arc-shaped sealing ring 152 and the fixing ring 151 is increased by reinforcing ring 157.

[0091] The edge sealing assembly 16 includes an inner sealing ring 161 and an outer sealing ring 162. The inner side of the inner sealing ring 161 is in contact with the surface of the rotating body 2, and an M-type sealing ring 163 is connected to the outer side of the inner sealing ring 161.

[0092] An outer elastic ring 164 is installed in the space between the M-type sealing ring 163 and the inner sealing ring 161. A Y-type sealing ring 166 is connected to the outer side of the M-type sealing ring 163. The outer side of the Y-type sealing ring 166 is connected to the inner side of the outer sealing ring 162. An inner elastic ring 165 is installed in the space between the M-type sealing ring 163 and the Y-type sealing ring 166.

[0093] The outer elastic ring 164 is used to provide radial preload.

[0094] The inner elastic ring 165 is used to provide axial support.

[0095] The sealing performance of the sealing structure is further improved by the side sealing assembly 16.

[0096] Two symmetrically distributed blocking components 17 are connected to the outer side of the outer sealing ring 162. Multiple connecting springs 167 are arranged between the two blocking components 17. The connecting springs 167 are connected to the inner side of the bearing housing 3 and the outer side of the outer sealing ring 162, respectively.

[0097] The outer elastic ring 164 increases the adhesion between the inner sealing ring 161 and the surface of the rotating body 2.

[0098] The installation strength of the M-type sealing ring 163 is increased by the inner elastic ring 165, so that the M-type sealing ring 163 is tightly attached to the inner sealing ring 161, thereby increasing the force of the inner sealing ring 161 against the rotating body 2.

[0099] Meanwhile, the Y-type sealing ring 166 can apply force to the M-type sealing ring 163, making the M-type sealing ring 163 more stable.

[0100] Two symmetrically distributed blocking components 17 are connected between the outer side of the outer sealing ring 162 and the inner side of the bearing housing 3. The blocking components 17 include an inner trapezoidal ring 171 and an outer trapezoidal ring 172. The inner side of the inner trapezoidal ring 171 is connected to the outer side of the outer sealing ring 162. The outer trapezoidal ring 172 is provided on both sides of the inner trapezoidal ring 171. The outer side of the outer trapezoidal ring 172 is connected to the inner side of the bearing housing 3.

[0101] Multiple stepped rings 173 are connected to the adjacent sides of the inner trapezoidal ring 171 and the outer trapezoidal ring 172.

[0102] The installation of multiple stepped rings 173 can prevent oil leakage.

[0103] The sealing performance between the outer sealing ring 162 and the bearing housing 3 is ensured by the blocking assembly 17, thereby further improving the overall sealing performance.

[0104] A triangular ring 174 is connected to one side of the stepped ring 173. The triangular ring 174 is connected to the corresponding inner trapezoidal ring 171 or outer trapezoidal ring 172 respectively.

[0105] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A rotating body sealing structure, characterized in that: It includes a fixed frame (1) and a rotating body (2), the fixed frame (1) and the rotating body (2) are rotatably connected, a bearing seat (3) is installed on one side of the fixed frame (1), a mounting bearing (5) is connected to the inner wall of the bearing seat (3), the inner side wall of the mounting bearing (5) is connected to the surface of the rotating body (2), an end cover (7) is provided on the side of the mounting bearing (5), and a skeleton oil seal (9) is provided between the end cover (7) and the mounting bearing (5). An installation groove is provided on the outer side of the skeleton oil seal (9), and an O-ring (10) is placed in the installation groove. A bearing cavity (11) is provided between the skeleton oil seal (9) and the mounting bearing (5). The bearing seat (3) has a vent hole (12). A quick connector (13) is installed at the vent hole (12) to inject compressed air into the bearing cavity (11) through the vent hole (12).

2. The rotating body sealing structure as described in claim 1, characterized in that: The mounting bracket (1) has a bearing seat (3) detachably connected to one side by multiple fixing bolts (4).

3. The rotating body sealing structure as described in claim 1, characterized in that: The end cap (7) is detachably connected to the side of the bearing housing (3) by a plurality of mounting bolts (6).

4. The rotating body sealing structure as described in claim 1, characterized in that: The skeleton oil seal (9) is detachably connected to the end cap (7) by multiple disassembly bolts (8), and the lip of the skeleton oil seal (9) is in contact with the surface of the rotating body (2).

5. The rotating body sealing structure as described in claim 1, characterized in that: The end caps (7) on both sides are equipped with mounting bearings (5) and auxiliary bearings (14). An auxiliary sealing unit is provided between the mounting bearings (5) and the auxiliary bearings (14). The auxiliary sealing unit is installed inside the bearing seat (3) and is in close contact with the surface of the rotating body (2). The auxiliary sealing unit includes a central sealing component (15) and a side sealing component (16), with side sealing components (16) provided on both sides of the central sealing component (15).

6. The rotating body sealing structure as described in claim 5, characterized in that: The central sealing assembly (15) includes two retaining rings (151), the outer sides of which are respectively connected to the inner wall of the bearing seat (3); Both of the two fixed rings (151) are connected to an arc-shaped sealing ring (152) on opposite sides, and the inner side of the arc-shaped sealing ring (152) is in contact with the surface of the rotating body (2). The two fixed rings (151), the two arc-shaped sealing rings (152), the surface of the rotating body (2) and the inner wall of the bearing seat (3) form a closed cavity. The bearing seat (3) is provided with a material passage hole (153) located above the closed cavity. A control connector (154) is installed in the material passage hole (153). Sealing liquid is introduced into the closed cavity.

7. The rotating body sealing structure as described in claim 6, characterized in that: The outer side of the arc-shaped sealing ring (152) is connected to two symmetrically distributed elastic clamping rings (156), and a medium elastic ring (155) is embedded in the two elastic clamping rings (156).

8. The rotating body sealing structure as described in claim 6, characterized in that: Both of the arc-shaped sealing rings (152) are connected to a reinforcing ring (157) on the side away from the fixed ring (151), and the outer side of the reinforcing ring (157) is connected to the inner wall of the bearing seat (3).

9. The rotating body sealing structure as described in claim 5, characterized in that: The side sealing assembly (16) includes an inner sealing ring (161) and an outer sealing ring (162). The inner side of the inner sealing ring (161) is in contact with the surface of the rotating body (2), and an M-type sealing ring (163) is connected to the outer side of the inner sealing ring (161). An outer elastic ring (164) is installed in the space between the M-type sealing ring (163) and the inner sealing ring (161). A Y-type sealing ring (166) is connected to the outer side of the M-type sealing ring (163). The outer side of the Y-type sealing ring (166) is connected to the inner side of the outer sealing ring (162). An inner elastic ring (165) is installed in the space between the M-type sealing ring (163) and the Y-type sealing ring (166).

10. The rotating body sealing structure as described in claim 9, characterized in that: Two symmetrically distributed blocking components (17) are connected between the outer side of the outer sealing ring (162) and the inner side of the bearing seat (3). The blocking components (17) include an inner trapezoidal ring (171) and an outer trapezoidal ring (172). The inner side of the inner trapezoidal ring (171) is connected to the outer side of the outer sealing ring (162). An outer trapezoidal ring (172) is provided on both sides of the inner trapezoidal ring (171). The outer side of the outer trapezoidal ring (172) is connected to the inner side of the bearing seat (3). The inner trapezoidal ring (171) and the outer trapezoidal ring (172) are connected to a plurality of stepped rings (173) on their adjacent sides.

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