Damp-proof sealing system of bearing seat for isolating switch

Abstract

The invention 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 to the base through cooperation of a bearing seat, the bearing seat comprises a bearing seat main body, the upper end of the bearing seat main body is provided with a shaft plate connected with the operation insulator, and the shaft plate is connected with the operation insulator. A rotating shaft connected with the shaft plate is arranged in the bearing seat main body, the rotating shaft is movably matched with the bearing seat main body, a first sealing assembly is further arranged between the side, connected with the shaft plate, of the rotating shaft and the bearing seat main body, and 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] The invention relates to the field of isolating switches, and in particular to a moisture-proof sealing system for a bearing seat used for isolating switches. Background Art

[0002] The GW4 isolating switch is a double-column horizontal rotary structure, which can be equipped with an earthing switch. It is mainly used in power lines with an AC frequency of 50 / 60Hz and a rated voltage of 110kV. It is used to disconnect or connect high-voltage circuits under no-load conditions, so as to convert high-voltage lines, change the operating mode, and implement safe electrical isolation of high-voltage electrical equipment such as busbars and circuit breakers under maintenance. The isolating switch consists of a base, two post insulators, an upper conductive part, and an operating mechanism. The post insulator is installed on the base, and the upper conductive part is installed above the post insulator. The upper mounting hole of the operating insulator is connected to the conductive arm, and the lower mounting hole is connected to the operating crank arm, which is connected to the operating rod. The operating mechanism drives the operating crank arm through the operating rod, and the operating crank arm drives the post insulator to rotate horizontally, thereby completing the opening and closing of the isolating switch.

[0003] As a typical open-type isolating switch, GW4 isolating switch has a large market demand. As GW4 isolating switch is widely used, it is often deployed in coastal areas with high temperature and high humidity and other areas with more wind and sand, and the environment is relatively harsh. The bearing seat that drives the insulator to rotate does not have a special moisture-proof sealing structure. Rainwater and dust will enter the bearing seat, causing corrosion and jamming of the bearing, making it impossible for the isolating switch to be effectively closed or opened, resulting in power outage losses. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a moisture-proof sealing system for a bearing seat for an isolating switch, so as to ensure reliable closing and opening operations in harsh environments and improve the operating reliability of power lines.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a moisture-proof sealing system for a bearing seat for an isolating switch, the isolating switch comprises a base and an operating insulator mounted on the base, the operating insulator is hinged to the base through the cooperation of the bearing seat, and the innovation point is that the bearing seat comprises A bearing seat body, wherein an axis plate connected to the operating insulator is disposed at the upper end of the bearing seat body, a rotating shaft connected to the axis plate is disposed inside the bearing seat body, the rotating shaft and the bearing seat body are movably matched, and a first sealing component is disposed between one side of the rotating shaft connected to the axis plate and the bearing seat body, and a second sealing component is disposed between the other side of the rotating shaft and the bearing seat body; The side of the bearing seat body close to the shaft plate is defined as the first side, and the side away from the shaft plate is defined as the second side; The first sealing assembly includes a sealing cover, a sealing gasket and a first wool felt. A protruding boss is provided on the first side of the bearing seat body, the shaft plate is located above the boss, the sealing cover is sleeved on the outer side of the boss, and the opening of the sealing cover faces the shaft plate. A sealing gasket is also provided between the sealing cover and the boss, and an annular groove for the sealing cover to be embedded and fixed is also provided on the outer side of the sealing gasket. The first wool felt is sleeved on the outer wall of the rotating shaft, and a protruding annular pressure block is also provided on the side of the rotating shaft close to the shaft plate. The first wool felt is provided between the end face of the bearing seat 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 seat body by bolts. An O-ring is also arranged between the cover and the end face of the bearing seat body. The cover and the bearing seat body cooperate to form an installation cavity. The second wool felt is placed in the installation cavity and fixed to the rotating shaft by a pressure plate and bolts.

[0006] Further, the cooperation between the rotating shaft and the bearing seat 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, and a cavity for accommodating the vertical installation of the rotating shaft is provided in the bearing seat body, and the 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 that 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 plane bearing and a second deep groove ball bearing are arranged between the rotating shaft and the bearing seat body; The first side of the bearing seat body is located at the end of the boss and is provided with a first groove for accommodating 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 fitted with the outer wall of the rotating shaft, the outer wall of the first deep groove ball bearing is fitted with the inner wall of the first groove, and the upper end surface of the first deep groove ball bearing is fitted with the first wool felt; The second cavity section of the bearing seat body is also provided with a second groove for accommodating the installation of the plane bearing. The second groove is located at the end of one side where the second cavity section is connected to the first cavity section. The plane bearing is placed in the second groove and is sleeved on the outer wall of the rotating shaft. The upper side of the plane bearing is in contact with the end of the first segment of the rotating shaft, and the lower side of the plane bearing is in contact with the second groove. The end of the second side of the bearing seat body is also provided with a third groove for accommodating the installation of a 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 fits with the outer wall of the rotating shaft, the outer wall of the second deep groove ball bearing fits with the inner wall of the third groove, and the lower end surface of the second deep groove ball bearing fits with the second wool felt.

[0007] Furthermore, a countersunk hole for accommodating the installation of a sealing cover is formed on the second side of the bearing seat body, and the size of the countersunk hole is larger than the size of the sealing cover.

[0008] Furthermore, the roughness of the contact surface between the bearing seat body and the first wool felt or the second wool felt is ≤3.2.

[0009] The advantages of the present invention are: by adopting the cooperation of the first sealing component and the second sealing component, the upper end of the bearing seat is sealed by the combined structure of the sealing cover, the sealing gasket and the first wool felt, and the lower end of the bearing seat is sealed by the combined structure of the sealing cover, the O-ring and the second wool felt, which can effectively ensure the sealing performance of the bearing seat in harsh environments, ensure the reliability of the opening and closing operations, and improve the performance of the disconnector product.

[0010] The cooperation between the rotating shaft and the bearing seat body adopts a T-shaped rotating shaft to fit with the bearing seat body with a T-shaped cavity, thereby achieving a one-way limit between the rotating shaft and the bearing seat body. In addition, a combination of different bearings, including the first deep groove ball bearing, the plane bearing and the second deep groove ball bearing, is used to assist the rotating shaft and the bearing seat body in rotating cooperation, ensuring that the rotating shaft can rotate smoothly relative to the bearing seat body, thereby avoiding undesirable phenomena such as jamming and blocking during the rotation of the rotating shaft, which may affect the smooth rotation of the operating insulator.

[0011] The roughness of the contact surface between the bearing seat body and the first wool felt or the second wool felt is designed to be less than 3.2, thereby reducing the friction resistance between the wool felt and the bearing seat body, reducing the wear of the wool felt, and increasing its service life.

[0012] The moisture-proof sealing system of the bearing seat for the isolating switch of the present invention has novel structure, simple appearance, strong machinability and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the moisture-proof sealing system of the bearing seat for the isolating switch of the present invention.

[0014] Figure 2 It is a cross-sectional view of the bearing seat body in the present invention.

[0015] Figure 3 It is an exploded schematic diagram of the bearing seat body in the present invention. DETAILED DESCRIPTION

[0016] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0017] like Figure 1-Figure 3A bearing seat moisture-proof sealing system for an isolating switch is shown. The isolating switch comprises a base 1 and an operating insulator mounted on the base 1 . The operating insulator is hinged to the base 1 through the cooperation of the bearing seat 2 .

[0018] Bearing seat 2 includes A bearing seat body 201, the bearing seat body 201 is fixed to the base 1 by the cooperation of bolts and nuts, a shaft plate 3 connected to the operating insulator is arranged at the upper end of the bearing seat body 201, the shaft plate 3 is a circular plate, a rotating shaft 202 connected to the shaft plate 3 is arranged in the bearing seat body 201, the rotating shaft 202 and the bearing seat body 201 are movably matched, and a first sealing component is arranged between one side of the rotating shaft 202 connected to the shaft plate 3 and the bearing seat body 201, and a second sealing component is arranged between the other side of the rotating shaft 202 and the bearing seat body 201.

[0019] The side of the bearing seat body 201 close to the shaft plate 3 is defined as the first side, and the side of the bearing seat body 201 away from the shaft plate 3 is defined as the second side. The first side of the bearing seat body 201 also has a boss 207 protruding toward 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.

[0020] The cooperation between the rotating shaft 202 and the bearing seat 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, the first segment and the second segment are both cylindrical structures, and the size of the first segment is larger than the size of the second segment, and there is a cavity 203 in the bearing seat body 201 for accommodating the upper and lower installation of the rotating shaft 202, and 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.

[0021] After the rotating shaft 202 is placed in the cavity 203 , a first deep groove ball bearing 204 , a plane bearing 205 and a second deep groove ball bearing 206 are arranged between the rotating shaft 202 and the bearing seat body 201 .

[0022] A first groove for accommodating the installation of the first deep groove ball bearing 204 is also opened at the end of the boss 207 on the first side of the bearing seat body 201, and the first groove is connected to the first cavity section. The first deep groove ball bearing 204 is placed in the first groove, and 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, and the outer wall of the first deep groove ball bearing 204 is in contact with the inner wall of the first groove.

[0023] A second groove for installing a plane bearing 205 is also opened in the second cavity section of the bearing seat body 201. The second groove is located at one end of the second cavity section connected to the first cavity section, and the second groove is connected to the second cavity section and the first cavity section. The plane bearing 205 is placed in the second groove, and the plane bearing 205 is directly mounted on the outer wall of the second segment of the rotating shaft 202. The upper side of the plane bearing 205 fits with the bottom end of the first segment of the rotating shaft 202, and the lower side of the plane bearing 205 fits with the second groove.

[0024] A third groove for accommodating the installation of a second deep groove ball bearing 206 is also opened at the end of the second side of the bearing seat body 201. 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, and the outer wall of the second deep groove ball bearing 206 is in contact with the inner wall of the third groove.

[0025] In the above structure, for the cooperation between the rotating shaft 202 and the bearing seat body 201, a T-shaped rotating shaft 202 is used to fit with the bearing seat body 201 with a T-shaped cavity, thereby achieving a one-way limit between the rotating shaft 202 and the bearing seat body 201, preventing the rotating shaft 202 from moving in the bearing seat body 201. Since the other side of the rotating shaft 202 is connected to the shaft plate 3, and the shaft plate 3 is connected to the operating insulator, the other one-way of the rotating shaft 202 can be directly prevented by the action of gravity. In addition, the combination of different bearings, such as the first deep groove ball bearing 204, the plane bearing 205 and the second deep groove ball bearing 206, is used to assist the rotating shaft 202 in rotating cooperation with the bearing seat body 201, ensuring that the rotating shaft 202 can rotate smoothly relative to the bearing seat body 201, avoiding the smooth rotation of the operating insulator due to undesirable phenomena such as jamming and blocking during the rotation of the rotating shaft 202.

[0026] The first sealing assembly includes a sealing cover 210, a gasket 211 and a first wool felt 212. The sealing cover 210 is mounted on the outer side of the boss 207, and the opening of the sealing cover 210 faces the shaft plate 3. A gasket 211 is also arranged between the sealing cover 210 and the boss 207. The gasket 211 is mounted on the outer wall of the boss 207 and fixed to the boss 207. There is also an annular groove on the outer side of the gasket 211 for accommodating the sealing cover 210 to be embedded and fixed. The upper end face of the sealing cover 210 fits with the bottom side face of the shaft plate 3. The first wool felt 212 is mounted on the outer wall of the rotating shaft 202. A protruding annular pressure block is also arranged on the side of the rotating shaft 202 close to the shaft plate 3. The first wool felt 212 is arranged 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 fits with the upper end face of the first deep groove ball bearing 204.

[0027] The second sealing assembly includes a cover 220, an O-ring 222 and a second wool felt 221. The cover 220 is connected to the bearing seat body 201 by bolts. A countersunk hole 225 for accommodating the cover 220 is provided on the second side of the bearing seat 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 built-in installation design of the cover 220, so that the cover 220 is prevented from protruding from the lower surface of the bearing seat body 201 after installation, and the overall appearance is more beautiful and interference with other components is avoided.

[0028] An O-ring 222 is also provided between the end face of the cover 220 and the bearing seat body 201, and an annular groove for accommodating the installation of 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 with the lower end face of the bearing seat body 201, and the cover 220 and the bearing seat body 201 cooperate to form an installation cavity. The second wool felt 221 is placed in the installation cavity and is fixed to the rotating shaft 202 through the cooperation of the pressing plate 223 and the bolt 224. The connection is specifically as follows: an annular groove for accommodating the screw is provided on the pressing plate 223. The through hole through which the bolt 224 passes is provided with a threaded blind hole on the bottom surface of the rotating shaft 202, which is threadedly matched with the bolt 224. After the upper end surface of the second wool felt 221 is pressed against the lower end surface of the bearing seat body 201, the pressure plate 223 is attached to the lower end surface of the second wool felt 221, and then the bolt 224 is passed through the through hole on the pressure plate 223 and threadedly matched with the bearing seat body 201, thereby fixing the second wool felt 221. When the upper end surface of the second wool felt 221 is pressed against the bearing seat body 201, the upper end surface of the second wool felt 221 will also be in contact with the lower end surface of the second deep groove ball bearing 206.

[0029] The roughness of the contact surface between the bearing seat body 201 and the first wool felt 212 or the second wool felt 221 is ≤3.2. The roughness of the contact surface between the bearing seat body 201 and the first wool felt 212 or the second wool felt 221 is designed to be less than 3.2, so as to reduce the friction resistance between the first wool felt 212, the second wool felt 221 and the bearing seat body 201, thereby reducing the wear of the first wool felt 212, the second wool felt 221, and improving the service life of the first wool felt 212, the second wool felt 221.

[0030] In the moisture-proof sealing system of the present invention, the upper end sealing structure of the bearing seat body 201 is composed of a sealing cover 210, a gasket 211 and a first wool felt 212. The gasket 211 is made of polytetrafluoroethylene and is fixed to the sealing cover 210 through a groove structure, thereby forming a first seal with the bearing seat body 201 to block fine particles such as sand and dust. The first wool felt 212 is fixed to the rotating shaft 202 by an interference fit. After the rotating shaft 202 is installed, the first wool felt 212 will be pressed against the inner ring of the first deep groove ball bearing 204 and the upper end face of the bearing seat body 201, thereby forming a second seal to block water vapor.

[0031] The lower end sealing structure of the bearing seat body 201 is composed of a cover 220, an O-ring 222 and a second wool felt 221. The O-ring 222 is installed in the groove of the cover 220. The cover 220 is fixed by tightening bolts so that the O-ring 222 obtains a certain deformation to form a first seal for blocking fine particles such as sand and dust. The second wool felt 221 is fixed to the bottom end of the rotating shaft 202 by bolts 224 and a pressure plate 223. After the rotating shaft 202 is installed, the second wool felt 221 will be pressed against the lower end surface of the bearing seat body 201, thereby forming a second seal for blocking water vapor.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A moisture-proof sealing system for a bearing seat for an isolating switch, the isolating switch comprising a base and an operating insulator mounted on the base, the operating insulator being hinged to the base through the cooperation of the bearing seat, characterized in that: The bearing seat comprises A bearing seat body, wherein an axis plate connected to the operating insulator is disposed at the upper end of the bearing seat body, a rotating shaft connected to the axis plate is disposed inside the bearing seat body, the rotating shaft and the bearing seat body are movably matched, and a first sealing component is disposed between one side of the rotating shaft connected to the axis plate and the bearing seat body, and a second sealing component is disposed between the other side of the rotating shaft and the bearing seat body; The side of the bearing seat body close to the shaft plate is defined as the first side, and the side away from the shaft plate is defined as the second side; The first sealing assembly includes a sealing cover, a sealing gasket and a first wool felt. A protruding boss is provided on the first side of the bearing seat body, the shaft plate is located above the boss, the sealing cover is sleeved on the outer side of the boss, and the opening of the sealing cover faces the shaft plate. A sealing gasket is also provided between the sealing cover and the boss, and an annular groove for the sealing cover to be embedded and fixed is also provided on the outer side of the sealing gasket. The first wool felt is sleeved on the outer wall of the rotating shaft, and a protruding annular pressure block is also provided on the side of the rotating shaft close to the shaft plate. The first wool felt is provided between the end face of the bearing seat 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 seat body by bolts. An O-ring is also arranged between the cover and the end face of the bearing seat body. The cover and the bearing seat body cooperate to form an installation cavity. The second wool felt is placed in the installation cavity and fixed to the rotating shaft by a pressure plate and bolts.

2. The moisture-proof sealing system for the bearing seat of the isolating switch according to claim 1 is characterized in that: The cooperation between the rotating shaft and the bearing seat 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, and a cavity for accommodating the vertical installation of the rotating shaft is provided in the bearing seat body, and the 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 that 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 plane bearing and a second deep groove ball bearing are arranged between the rotating shaft and the bearing seat body; The first side of the bearing seat body is located at the end of the boss and is provided with a first groove for accommodating 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 fitted with the outer wall of the rotating shaft, the outer wall of the first deep groove ball bearing is fitted with the inner wall of the first groove, and the upper end surface of the first deep groove ball bearing is fitted with the first wool felt; The second cavity section of the bearing seat body is also provided with a second groove for accommodating the installation of the plane bearing. The second groove is located at the end of one side where the second cavity section is connected to the first cavity section. The plane bearing is placed in the second groove and is sleeved on the outer wall of the rotating shaft. The upper side of the plane bearing is in contact with the end of the first segment of the rotating shaft, and the lower side of the plane bearing is in contact with the second groove. The end of the second side of the bearing seat body is also provided with a third groove for accommodating the installation of a 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 fits with the outer wall of the rotating shaft, the outer wall of the second deep groove ball bearing fits with the inner wall of the third groove, and the lower end surface of the second deep groove ball bearing fits with the second wool felt.

3. The moisture-proof sealing system for the bearing seat for the isolating switch according to claim 1 is characterized in that: The second side of the bearing seat body is also provided with a countersunk hole for accommodating the installation of a sealing cover, and the size of the countersunk hole is larger than the size of the sealing cover.

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

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