Damp-proof sealing system of bearing seat for isolating switch

Abstract

The utility model relates to a bearing seat moisture-proof sealing system for an isolating switch, the isolating switch comprises a base and an operation insulator installed on the base, the operation insulator is hinged with the base through the cooperation of a bearing seat, and the bearing seat comprises a bearing seat main body. A shaft plate connected with an operation insulator is arranged at the upper end of the bearing seat body, a rotating shaft connected with the shaft plate is arranged in the bearing seat body, the rotating shaft is movably matched with the bearing seat body, and a first sealing assembly is further arranged between the side, connected with the shaft plate, of the rotating shaft and the bearing seat body. A second sealing assembly is arranged between the other side of the rotating shaft and the bearing seat main body; the first sealing assembly comprises a sealing cover, a sealing pad and a first wool felt, and the second sealing assembly comprises a sealing cover, an O-shaped sealing ring and a second wool felt. Through the cooperation of the first sealing assembly and the second sealing assembly, the sealing performance of the bearing seat can be effectively ensured in a severe environment, the reliability of opening and closing operation is ensured, and the product performance of the disconnecting switch is improved.

Description

Technical Field

[0001] This utility model relates to the field of disconnect switches, and in particular to a moisture-proof sealing system for a bearing housing of a disconnect switch. Background Technology

[0002] The GW4 type disconnecting switch is a double-column horizontal rotary structure that can be equipped with a grounding switch. It is mainly used in AC 50 / 60Hz power lines with a rated voltage of 110kV to disconnect or connect high-voltage circuits under no-load conditions. This allows for switching and changing the operating mode of high-voltage lines, as well as providing safe electrical isolation between busbars under maintenance and high-voltage electrical equipment such as circuit breakers. The disconnecting switch consists of a base, two post insulators, an upper conductive part, and an operating mechanism. The post insulators are mounted on the base, and the upper conductive part is mounted above them. The upper mounting hole of the operating insulator connects to the conductive arm, and the lower mounting hole connects to the operating crank arm, which is connected to the operating rod. The operating mechanism drives the operating crank arm via the operating rod, which in turn rotates the post insulator horizontally, thus completing the opening and closing of the disconnecting switch.

[0003] The GW4 type disconnector is a typical open-type disconnector with a large market share. Due to its widespread application, the GW4 type disconnector is frequently deployed in harsh environments such as coastal areas with high temperatures and humidity, and areas with frequent sandstorms. The bearing housing that drives the rotation of the insulator lacks a dedicated moisture-proof sealing structure, allowing rainwater and dust to enter the bearing housing, leading to corrosion and jamming of the bearing. This can cause the disconnector to malfunction during effective closing and opening operations, resulting in power outages. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a moisture-proof sealing system for the bearing housing of a disconnecting switch, so as to ensure reliable opening and closing operation in harsh environments and improve the reliability of power line operation.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a moisture-proof sealing system for a bearing housing of a disconnecting switch, wherein the disconnecting switch includes a base and an operating insulator mounted on the base, and the operating insulator is hinged to the base through the cooperation of a bearing housing. The innovation lies in that: the bearing housing includes...

[0006] A bearing housing body has a shaft plate connected to an operating insulator at its upper end. A rotating shaft connected to the shaft plate is disposed inside the bearing housing body. The rotating shaft is movably fitted with the bearing housing body. A first sealing assembly is disposed between the side of the rotating shaft connected to the shaft plate and the bearing housing body. A second sealing assembly is disposed between the other side of the rotating shaft and the bearing housing body.

[0007] The side of the bearing housing body closest to the shaft plate is designated as the first side, and the side furthest from the shaft plate is designated as the second side.

[0008] The first sealing assembly includes a sealing cover, a gasket, and a first wool felt. A protruding boss is provided on the first side of the bearing housing body. The shaft plate is located above the boss. The sealing cover is fitted on the outside of the boss, and the opening of the sealing cover faces the shaft plate. A gasket is also provided between the sealing cover and the boss. An annular groove for the sealing cover to be embedded and fixed is provided on the outside of the gasket. The first wool felt is fitted on the outer wall of the rotating shaft. A protruding annular pressure block is provided on the side of the rotating shaft near the shaft plate. The first wool felt is disposed between the end face of the bearing housing body and the annular pressure block of the rotating shaft.

[0009] The second sealing assembly includes a cover, an O-ring, and a second wool felt. The cover is connected to the bearing housing body by bolts. An O-ring is also provided between the end faces of the cover and the bearing housing body. The cover and the bearing housing body cooperate to form an installation cavity. The second wool felt is placed in the installation cavity and is fixed to the rotating shaft by a pressure plate and bolts.

[0010] Furthermore, the fit between the rotating shaft and the bearing housing body is as follows: the rotating shaft is a T-shaped structure composed of a first segment and a second segment, and the end of the first segment is connected to the shaft plate. The bearing housing body has a cavity for the rotating shaft to be installed vertically. This cavity is also a T-shaped cavity composed of a first cavity segment and a second cavity segment, and the size of the first cavity segment is larger than the size of the second cavity segment. The first segment is placed in the first cavity segment, and the second segment is placed in the second cavity segment.

[0011] After the rotating shaft is placed in the cavity, a first deep groove ball bearing, a flat bearing, and a second deep groove ball bearing are also provided between the rotating shaft and the bearing housing body.

[0012] The first side of the bearing housing body is provided with a first groove at the end of the boss to accommodate the installation of the first deep groove ball bearing. The first deep groove ball bearing is placed in the first groove, and the inner wall of the first deep groove ball bearing is in contact with the outer wall of the rotating shaft. The outer wall of the first deep groove ball bearing is in contact with the inner wall of the first groove, and the upper end face of the first deep groove ball bearing is in contact with the first wool felt.

[0013] The second cavity section of the bearing housing body is also provided with a second groove for mounting a planar bearing. The second groove is located at the end of the second cavity section connected to the first cavity section. The planar bearing is placed in the second groove and fitted onto the outer wall of the rotating shaft. The upper side of the planar bearing is in contact with the end of the first segment of the rotating shaft, and the lower side of the planar bearing is in contact with the second groove.

[0014] The second side of the bearing housing body also has a third groove for installing the second deep groove ball bearing. The second deep groove ball bearing is placed in the third groove, and the inner wall of the second deep groove ball bearing is in contact with the outer wall of the rotating shaft. The outer wall of the second deep groove ball bearing is in contact with the inner wall of the third groove, and the lower end face of the second deep groove ball bearing is in contact with the second wool felt.

[0015] Furthermore, the second side of the bearing housing body is also provided with a countersunk hole for mounting a cover, and the size of the countersunk hole is larger than the size of the cover.

[0016] Furthermore, the roughness of the contact surface between the bearing housing body and the first or second wool felt is ≤3.2.

[0017] The advantages of this utility model are as follows: by using the cooperation of the first sealing component and the second sealing component, the upper end of the bearing seat is sealed by the combination structure of the sealing cover, the gasket and the first wool felt, and the lower end of the bearing seat is sealed by the combination structure of the cover, the O-ring and the second wool felt. This can effectively ensure the sealing performance of the bearing seat in harsh environments, ensure the reliability of the opening and closing operation, and improve the performance of the disconnecting switch product.

[0018] The rotation shaft and the bearing housing body are fitted together by a T-shaped rotating shaft that fits into the T-shaped cavity of the bearing housing body, thus providing a one-way limiting effect between the rotating shaft and the bearing housing body. In addition, a combination of different bearings, including a first deep groove ball bearing, a flat bearing, and a second deep groove ball bearing, is used to assist in the rotational fit between the rotating shaft and the bearing housing body, ensuring that the rotating shaft can rotate smoothly relative to the bearing housing body and avoiding any jamming or other adverse phenomena that could affect the smooth rotation of the operating insulator.

[0019] The roughness of the contact surface between the bearing housing body and the first or second wool felt is designed to be less than 3.2, thereby reducing the frictional resistance between the wool felt and the bearing housing body, reducing the wear of the wool felt, and improving its service life.

[0020] The moisture-proof sealing system for the bearing housing of the disconnecting switch of this utility model has a novel structure, simple appearance, strong machinability, and low cost. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the moisture-proof sealing system for the bearing housing of the disconnecting switch according to this utility model.

[0022] Figure 2 This is a cross-sectional view of the bearing housing body in this utility model.

[0023] Figure 3 This is an exploded view of the bearing housing body in this utility model. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0025] like Figures 1-3 The diagram shows a moisture-proof sealing system for a bearing housing of a disconnecting switch. The disconnecting switch includes a base 1 and an operating insulator mounted on the base 1. The operating insulator is hinged to the base 1 through a bearing housing 2.

[0026] Bearing housing 2 includes

[0027] A bearing housing body 201 is fixed to a base 1 by bolts and nuts. A shaft plate 3 connected to an operating insulator is provided at the upper end of the bearing housing body 201. The shaft plate 3 is a circular plate. A rotating shaft 202 connected to the shaft plate 3 is provided inside the bearing housing body 201. The rotating shaft 202 is movably fitted with the bearing housing body 201. A first sealing component is provided between the side of the rotating shaft 202 connected to the shaft plate 3 and the bearing housing body 201, and a second sealing component is provided between the other side of the rotating shaft 202 and the bearing housing body 201.

[0028] The side of the bearing housing body 201 closest to the shaft plate 3 is designated as the first side, and the side of the bearing housing body 201 furthest from the shaft plate 3 is designated as the second side. The first side of the bearing housing body 201 also has a boss 207 protruding towards the shaft plate 3. The shaft plate 3 is located above the boss 207, and a gap is left between the shaft plate 3 and the boss 207.

[0029] The fit between the rotating shaft 202 and the bearing housing body 201 is as follows: the rotating shaft 202 is a T-shaped structure composed of a first segment and a second segment, and the end of the first segment is connected to the shaft plate 3. Both the first segment and the second segment are cylindrical structures, and the size of the first segment is larger than the size of the second segment. The bearing housing body 201 has a cavity 203 for the rotating shaft 202 to be installed vertically. The cavity 203 is also a T-shaped cavity composed of a first cavity segment and a second cavity segment, and the size of the first cavity segment is larger than the size of the second cavity segment. The first segment is placed in the first cavity segment, and the second segment is placed in the second cavity segment.

[0030] After the rotating shaft 202 is placed in the cavity 203, a first deep groove ball bearing 204, a flat bearing 205 and a second deep groove ball bearing 206 are also provided between it and the bearing housing body 201.

[0031] On the first side of the bearing housing body 201, at the end of the boss 207, there is a first groove for mounting the first deep groove ball bearing 204. The first groove is connected to the first cavity section. The first deep groove ball bearing 204 is placed in the first groove. The inner wall of the first deep groove ball bearing 204 is in contact with the outer wall of the first segment of the rotating shaft 202. The outer wall of the first deep groove ball bearing 204 is in contact with the inner wall of the first groove.

[0032] A second groove for mounting a planar bearing 205 is also provided in the second cavity section of the bearing housing body 201. The second groove is located at the end of the second cavity section connected to the first cavity section, and the second groove is connected to both the second cavity section and the first cavity section. The planar bearing 205 is placed in the second groove and is directly fitted onto the outer wall of the second segment of the rotating shaft 202. The upper side of the planar bearing 205 is in contact with the bottom end of the first segment of the rotating shaft 202, and the lower side of the planar bearing 205 is in contact with the second groove.

[0033] A third groove is also provided at the end of the second side of the bearing housing body 201 to accommodate the installation of the second deep groove ball bearing 206. The third groove is connected to the second cavity section. The second deep groove ball bearing 206 is placed in the third groove, and the inner wall of the second deep groove ball bearing 206 is in contact with the outer wall of the second segment of the rotating shaft 202. The outer wall of the second deep groove ball bearing 206 is in contact with the inner wall of the third groove.

[0034] In the above structure, for the fit between the rotating shaft 202 and the bearing housing body 201, a T-shaped rotating shaft 202 is used to fit against the bearing housing body 201 with a T-shaped cavity, thereby providing a one-way limiting effect between the rotating shaft 202 and the bearing housing body 201, preventing the rotating shaft 202 from moving within the bearing housing body 201. Since the other side of the rotating shaft 202 is connected to the shaft plate 3, and the operating insulator is connected to the shaft plate 3, gravity can directly prevent the rotating shaft 202 from moving in the other direction. In addition, the combination of different bearings, namely the first deep groove ball bearing 204, the flat bearing 205, and the second deep groove ball bearing 206, provides an auxiliary rotational fit between the rotating shaft 202 and the bearing housing body 201, ensuring that the rotating shaft 202 can rotate smoothly relative to the bearing housing body 201, and avoiding the impact of jamming or other adverse phenomena on the smooth rotation of the operating insulator due to the rotation of the rotating shaft 202.

[0035] The first sealing assembly includes a sealing cover 210, a gasket 211, and a first wool felt 212. The sealing cover 210 is fitted on the outside of the boss 207, and the opening of the sealing cover 210 faces the shaft plate 3. A gasket 211 is also provided between the sealing cover 210 and the boss 207. The gasket 211 is fitted on the outer wall of the boss 207 and fixed to the boss 207. There is also an annular groove on the outside of the gasket 211 to accommodate the sealing cover 210. The upper end face of the sealing cover 210 is in contact with the bottom side of the shaft plate 3. The first wool felt 212 is fitted on the outer wall of the rotating shaft 202. A protruding annular pressure block is also provided on the side of the rotating shaft 202 near the shaft plate 3. The first wool felt 212 is located between the end face of the bearing seat body 201 and the annular pressure block of the rotating shaft 202, and the lower end face of the first wool felt 212 is in contact with the upper end face of the first deep groove ball bearing 204.

[0036] The second sealing assembly includes a cover 220, an O-ring 222, and a second felt 221. The cover 220 is connected to the bearing housing body 201 by bolts. A countersunk hole 225 for installing the cover 220 is also provided on the second side of the bearing housing body 201, and the size of the countersunk hole 225 is larger than the size of the cover 220. The design of the countersunk hole 225 realizes the internal installation of the cover 220, thus preventing the cover 220 from protruding from the lower surface of the bearing housing body 201 after installation, making the overall appearance more aesthetically pleasing, and avoiding interference with other components.

[0037] An O-ring 222 is provided between the end faces of the cover 220 and the bearing housing body 201. An annular groove for accommodating the O-ring 222 is also provided on the cover 220. After the O-ring 222 is placed in the annular groove on the cover 220, the upper end face of the O-ring 222 fits against the lower end face of the bearing housing body 201. The cover 220 and the bearing housing body 201 together form an installation cavity. The second felt 221 is placed in the installation cavity and fixed to the rotating shaft 202 by the cooperation of the pressure plate 223 and bolts 224. Specifically, the connection is as follows: a bolt-shaped groove is provided on the pressure plate 223. The through hole through which the bolt 224 passes has a threaded blind hole on the bottom surface of the rotating shaft 202 that is threaded to engage with the bolt 224. After the upper end face of the second wool felt 221 is pressed against the lower end face of the bearing housing body 201, the pressure plate 223 is then attached to the lower end face of the second wool felt 221. Then, the bolt 224 passes through the through hole on the pressure plate 223 and is threaded to engage with the bearing housing body 201, thereby fixing the second wool felt 221. When the upper end face of the second wool felt 221 presses against the bearing housing body 201, the upper end face of the second wool felt 221 will simultaneously be in contact with the lower end face of the second deep groove ball bearing 206.

[0038] The surface roughness at the contact surface between the bearing housing body 201 and the first wool felt 212 or the second wool felt 221 is ≤3.2. Designing the surface roughness at the contact surface between the bearing housing body 201 and the first wool felt 212 or the second wool felt 221 to be less than 3.2 reduces the frictional resistance between the first wool felt 212, the second wool felt 221 and the bearing housing body 201, thereby reducing the wear of the first wool felt 212 and the second wool felt 221 and improving their service life.

[0039] The moisture-proof sealing system of this utility model consists of a sealing cover 210, a gasket 211, and a first wool felt 212 at the upper end of the bearing housing body 201. The gasket 211 is made of polytetrafluoroethylene and is fixed to the sealing cover 210 through a groove structure, thereby forming a first seal between it and the bearing housing body 201 to block fine particles such as sand and dust. The first wool felt 212 is fixed to the rotating shaft 202 by interference fit. After the rotating shaft 202 is installed, the first wool felt 212 will press against the inner ring of the first deep groove ball bearing 204 and the upper end face of the bearing housing body 201, thus forming a second seal to block water vapor.

[0040] The lower sealing structure of the bearing housing body 201 consists of a cover 220, an O-ring 222, and a second felt 221. The O-ring 222 is installed in the groove of the cover 220. The cover 220 is fixed by fastening bolts, so that the O-ring 222 obtains a certain amount of deformation to form the first seal to block fine particles such as sand and dust. The second felt 221 is fixed to the bottom end of the rotating shaft 202 by bolts 224 and pressure plate 223. After the rotating shaft 202 is installed, the second felt 221 will press against the lower end face of the bearing housing body 201, thus forming the second seal to block water vapor.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A moisture-proof sealing system for a bearing housing of a disconnecting switch, the disconnecting switch comprising a base and an operating insulator mounted on the base, the operating insulator being hinged to the base via a bearing housing, characterized in that: The bearing housing includes A bearing housing body has a shaft plate connected to an operating insulator at its upper end. A rotating shaft connected to the shaft plate is disposed inside the bearing housing body. The rotating shaft is movably fitted with the bearing housing body. A first sealing assembly is disposed between the side of the rotating shaft connected to the shaft plate and the bearing housing body. A second sealing assembly is disposed between the other side of the rotating shaft and the bearing housing body. The side of the bearing housing body closest to the shaft plate is designated as the first side, and the side furthest from the shaft plate is designated as the second side. The first sealing assembly includes a sealing cover, a gasket, and a first wool felt. A protruding boss is provided on the first side of the bearing housing body. The shaft plate is located above the boss. The sealing cover is fitted on the outside of the boss, and the opening of the sealing cover faces the shaft plate. A gasket is also provided between the sealing cover and the boss. An annular groove for the sealing cover to be embedded and fixed is provided on the outside of the gasket. The first wool felt is fitted on the outer wall of the rotating shaft. A protruding annular pressure block is provided on the side of the rotating shaft near the shaft plate. The first wool felt is disposed between the end face of the bearing housing body and the annular pressure block of the rotating shaft. The second sealing assembly includes a cover, an O-ring, and a second wool felt. The cover is connected to the bearing housing body by bolts. An O-ring is also provided between the end faces of the cover and the bearing housing body. The cover and the bearing housing body cooperate to form an installation cavity. The second wool felt is placed in the installation cavity and is fixed to the rotating shaft by a pressure plate and bolts.

2. The moisture-proof sealing system for the bearing housing of a disconnecting switch according to claim 1, characterized in that: The fit between the rotating shaft and the bearing housing body is as follows: the rotating shaft is a T-shaped structure composed of a first segment and a second segment, and the end of the first segment is connected to the shaft plate. The bearing housing body has a cavity for the rotating shaft to be installed vertically. This cavity is also a T-shaped cavity composed of a first cavity segment and a second cavity segment, and the size of the first cavity segment is larger than the size of the second cavity segment. The first segment is placed in the first cavity segment, and the second segment is placed in the second cavity segment. After the rotating shaft is placed in the cavity, a first deep groove ball bearing, a flat bearing, and a second deep groove ball bearing are also provided between the rotating shaft and the bearing housing body. The first side of the bearing housing body is provided with a first groove at the end of the boss to accommodate the installation of the first deep groove ball bearing. The first deep groove ball bearing is placed in the first groove, and the inner wall of the first deep groove ball bearing is in contact with the outer wall of the rotating shaft. The outer wall of the first deep groove ball bearing is in contact with the inner wall of the first groove, and the upper end face of the first deep groove ball bearing is in contact with the first wool felt. The second cavity section of the bearing housing body is also provided with a second groove for mounting a planar bearing. The second groove is located at the end of the second cavity section connected to the first cavity section. The planar bearing is placed in the second groove and fitted onto the outer wall of the rotating shaft. The upper side of the planar bearing is in contact with the end of the first segment of the rotating shaft, and the lower side of the planar bearing is in contact with the second groove. The second side of the bearing housing body also has a third groove for installing the second deep groove ball bearing. The second deep groove ball bearing is placed in the third groove, and the inner wall of the second deep groove ball bearing is in contact with the outer wall of the rotating shaft. The outer wall of the second deep groove ball bearing is in contact with the inner wall of the third groove, and the lower end face of the second deep groove ball bearing is in contact with the second wool felt.

3. The moisture-proof sealing system for the bearing housing of a disconnecting switch according to claim 1, characterized in that: The second side of the bearing housing body also has a countersunk hole for installing a cover, and the size of the countersunk hole is larger than the size of the cover.

4. The moisture-proof sealing system for the bearing housing of a disconnecting switch according to claim 1, characterized in that: The roughness of the contact surface between the bearing housing body and the first or second wool felt is ≤3.2.

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