Bushing for three-phase power capacitor

Abstract

The utility model relates to a bushing for a three-phase power capacitor, and relates to the technical field of electric power engineering, the bushing comprises a tube body and a conductive rod arranged in the tube body, the top end of the tube body is provided with an electrode contact, one end of the conductive rod is connected with the electrode contact, the other end of the conductive rod is connected with the interior of the capacitor, and the bottom end of the tube body is provided with a connecting mechanism. The pipe body is connected with the capacitor through the connecting mechanism. The silicone rubber sleeve is sleeved outside the pipe body, so that the whole pipe sleeve has excellent electrical insulating property and is more resistant to high and low temperature and aging compared with a porcelain sleeve, the probability of deformation of the whole pipe sleeve in a temperature difference environment is reduced, the structural stability and the sealing property are ensured, and the service life of the pipe sleeve is prolonged. And then the first sealing assembly and the second sealing assembly are installed on the silicone rubber sleeve, so that the sealing performance of the connection parts between the silicone rubber sleeve and the electrode contact and the connection flange is ensured, the sealing performance when the whole pipe sleeve is connected with the capacitor is improved, and the pipe sleeve is stable and durable.

Description

Technical Field

[0001] This application relates to the technical field of power engineering, and in particular to a bushing for a three-phase power capacitor. Background Technology

[0002] The bushing of a power capacitor is an important component of a capacitor, used to protect the internal components while providing insulation and electrical connection. It typically consists of conductors, insulating materials, and a sealing structure, isolating the high-voltage conductive parts of the capacitor from the external environment, preventing current leakage or short circuits, and ensuring the safe operation of the capacitor under high voltage.

[0003] Traditional power capacitors typically use porcelain bushings because they can withstand the electric field strength under high voltage conditions, preventing current leakage to the outside and ensuring the safe operation of the capacitor. However, porcelain bushings are prone to deformation when exposed to temperature differences, resulting in poor sealing between the bushing and the capacitor. This allows air and moisture to easily penetrate between the bushing and the capacitor, accelerating insulation aging and causing equipment failure. Utility Model Content

[0004] To improve the sealing between the bushing and the capacitor, this application provides a bushing for a three-phase power capacitor.

[0005] This application provides a bushing for a three-phase power capacitor, employing the following technical solution:

[0006] A bushing for a three-phase power capacitor includes a tube body and a conductive rod disposed inside the tube body. An electrode connector is disposed at the top of the tube body. One end of the conductive rod is connected to the electrode connector, and the other end of the conductive rod is connected to the interior of the capacitor. A connecting mechanism is disposed at the bottom of the tube body, through which the tube body is connected to the capacitor. The connecting mechanism includes:

[0007] A connecting flange is provided at the bottom end of the pipe body, and the pipe body is connected to the capacitor through the connecting flange;

[0008] A silicone rubber sleeve is fitted onto the tube body. The silicone rubber sleeve is provided with a first sealing component and a second sealing component. The top of the silicone rubber sleeve is connected to the electrode connector through the first sealing component, which seals the connection between the silicone rubber sleeve and the electrode connector. The bottom of the silicone rubber sleeve is connected to the connecting flange through the second sealing component, which seals the connection between the silicone rubber sleeve and the connecting flange.

[0009] By adopting the above technical solution, a silicone rubber sleeve is installed on the outer casing of the tube, which makes the tube sleeve more resistant to high and low temperatures and aging than ceramic sleeves, while also providing excellent electrical insulation. This reduces the probability of deformation of the tube sleeve under temperature difference conditions, ensuring structural stability and sealing. Then, the first sealing component and the second sealing component are installed on the silicone rubber sleeve, which ensures the sealing of the connection between the silicone rubber sleeve and the electrode connector and the connecting flange, thereby improving the sealing performance of the tube sleeve when connected to the capacitor, making it stable and durable.

[0010] Optionally, the first sealing assembly includes:

[0011] The first sealing ring is disposed at the top of the silicone rubber sleeve, and the inner ring wall of the first sealing ring is threaded.

[0012] A first sealing ring is disposed on the electrode connector and is threadedly connected to a first sealing sleeve.

[0013] A first sealing ring is fitted onto the outer wall of a first sealing sleeve. The first sealing ring has a sealing flange that covers the connection between the first sealing ring and the first sealing sleeve.

[0014] By adopting the above technical solution, a first sealing collar is installed at the top of the silicone rubber sleeve, and a first sealing ring is installed on the electrode connector. After the first sealing ring and the first sealing collar are threaded together, a first sealing ring is used to cover the first sealing collar and the first sealing ring, thereby completing the connection and sealing work between the silicone rubber sleeve and the electrode connector.

[0015] Optionally, the second sealing assembly includes:

[0016] The second sealing ring is disposed at the bottom end of the silicone rubber sleeve, and the outer wall of the second sealing ring is threaded.

[0017] The second sealing nut is disposed on the connecting flange, and the second sealing ring is threadedly connected to the second sealing nut.

[0018] The second sealing ring is fitted onto the second sealing nut and covers the connection between the second sealing nut and the second sealing ring.

[0019] By adopting the above technical solution, a second sealing ring is installed at the bottom of the silicone rubber sleeve, and a second sealing nut is installed on the connecting flange. After the second sealing ring is rotated and connected to the second sealing nut by thread, the second sealing ring is moved to cover the second sealing nut, thus completing the connection and sealing work between the second sealing ring and the connecting flange. Moreover, the threaded connection between the second sealing ring and the second sealing nut means that when it is necessary to replace or disassemble the sleeve, it is not necessary to disassemble the connecting flange. Simply unscrew the second sealing ring and the second sealing nut to separate them, which is more convenient and quick, and makes the connection of the connecting flange more stable.

[0020] Optionally, a sealing pad is provided inside the second sealing nut, and the sealing pad fills the gaps on the inner and outer walls of the second sealing ring under the compression of the second sealing ring.

[0021] By adopting the above technical solution, a sealing gasket is installed inside the second sealing nut. Under the compression of the second sealing ring, the sealing gasket fills the gaps on the inner and outer walls of the second sealing ring, thereby greatly improving the sealing performance after the second sealing ring and the second sealing nut are connected.

[0022] Optionally, the connecting flange is provided with a protective cover, and the protective cover is provided with a snap-fit ​​assembly. The protective cover is fixed to the connecting flange by the snap-fit ​​assembly, and the protective cover covers the surface of the connecting flange.

[0023] By adopting the above technical solution, a protective cover is installed on the connecting flange. The protective cover covers the surface of the connecting flange, thereby improving the surface sealing of the connecting flange and reducing the probability of corrosion or damage caused by wind, sand and rain in the external environment, thus increasing the service life of the connecting flange.

[0024] Optionally, the snap-fit ​​component includes:

[0025] The protective cover has a horizontal sliding groove on its inner sidewall, and the locking block is slidably mounted on the sliding groove.

[0026] A snap-fit ​​spring is provided on the bottom wall of the sliding groove and connected to a snap-fit ​​block. Under the action of the snap-fit ​​spring, the snap-fit ​​block extends out of the sliding groove and abuts against the outer wall of the connecting flange.

[0027] A pull rod is horizontally slidably mounted on the protective cover, with one end of the pull rod located outside the protective cover and the other end of the pull rod connected to a locking block.

[0028] By adopting the above technical solution, pulling the lever causes the locking block to compress the locking spring and move, causing the end of the locking block that extends out of the sliding groove to retract into the sliding groove. Then, the protective cover can be moved to cover the connecting flange. After the protective cover covers the connecting flange, the lever is released, and the locking block, under the action of the locking spring, partially extends out of the sliding groove and presses against the outer wall of the connecting flange, thus completing the work of fixing the position of the protective cover on the connecting flange.

[0029] Optionally, an arc-shaped guide surface is provided on the side wall of the end of the card block that protrudes from the sliding groove and is close to the opening of the protective cover.

[0030] By adopting the above technical solution, an arc-shaped guide surface is opened on the side wall near the opening of the protective cover at the end of the locking block that protrudes from the sliding groove. When the protective cover is moved to cover the connecting flange, the guide surface on the locking block will first contact the connecting flange. The guide surface will generate a component force to drive the locking block into the sliding groove, thus eliminating the need to manually pull the lever to make the locking block enter the sliding groove, simplifying the work steps and improving work efficiency.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. By installing a silicone rubber sleeve over the tube body, the sleeve not only has excellent electrical insulation properties, but is also more resistant to high and low temperatures and aging than ceramic sleeves. This reduces the probability of deformation of the sleeve under temperature difference conditions, ensuring structural stability and sealing. Then, by installing the first and second sealing components on the silicone rubber sleeve, the sealing between the silicone rubber sleeve and the electrode connector and the connecting flange is ensured, thereby improving the sealing performance of the entire sleeve when connected to the capacitor, making it stable and durable.

[0033] 2. By installing a sealing gasket inside the second sealing nut, the sealing gasket fills the gaps on the inner and outer walls of the second sealing ring under the compression of the second sealing ring, thereby greatly improving the sealing performance after the second sealing ring and the second sealing nut are connected.

[0034] 3. By creating an arc-shaped guide surface on the side wall near the opening of the protective cover at the end of the locking block that protrudes from the sliding groove, the guide surface on the locking block will first contact the connecting flange when the protective cover is moved to cover the connecting flange. The guide surface will generate a component force to drive the locking block into the sliding groove, thus eliminating the need to manually pull the lever to move the locking block into the sliding groove, simplifying the work steps and improving work efficiency. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural diagram of this application;

[0036] Figure 2 yes Figure 1A cross-sectional schematic diagram of AA in the middle;

[0037] Figure 3 yes Figure 2 Enlarged schematic diagram of section B.

[0038] Reference numerals: 11. Tube body; 12. Conductive rod; 13. Electrode connector; 14. Protective cover; 2. Connecting mechanism; 21. Connecting flange; 22. Silicone rubber sleeve; 3. First sealing assembly; 31. First sealing collar; 32. First sealing ring; 33. First sealing ring; 34. Sealing flange; 4. Second sealing assembly; 41. Second sealing ring; 42. Second sealing nut; 43. Second sealing ring; 44. Sealing gasket; 5. Snap-fit ​​assembly; 51. Snap-fit ​​block; 52. Snap-fit ​​spring; 53. Pull rod; 54. Sliding groove; 55. Guide surface. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 This application will be described in further detail.

[0040] This application discloses a bushing for a three-phase power capacitor.

[0041] Reference Figure 1 and Figure 2 The bushing for a three-phase power capacitor includes a tube body 11 and a conductive rod 12 fixedly installed inside the tube body 11. An electrode connector 13 is fixedly installed at the top of the tube body 11, one end of the conductive rod 12 is connected to the electrode connector 13, and the other end of the conductive rod 12 is connected to the inside of the capacitor. A connecting mechanism 2 is provided at the bottom of the tube body 11, through which the tube body 11 is connected to the capacitor.

[0042] Reference Figure 1 and Figure 2 The connecting mechanism 2 includes a connecting flange 21 and a silicone rubber sleeve 22. The connecting flange 21 is located at the bottom end of the tube body 11, and the tube body 11 is connected to the capacitor through the connecting flange 21. The silicone rubber sleeve 22 is fitted onto the outer wall of the tube body 11. The silicone rubber sleeve 22 is provided with a first sealing component 3 and a second sealing component 4. The top of the silicone rubber sleeve 22 is connected to the electrode connector 13 through the first sealing component 3, which seals the connection between the silicone rubber sleeve 22 and the electrode connector 13. The bottom of the silicone rubber sleeve 22 is connected to the connecting flange 21 through the second sealing component 4, which seals the connection between the silicone rubber sleeve 22 and the connecting flange 21.

[0043] Reference Figure 2The first sealing assembly 3 includes a first sealing collar 31, a first sealing ring 32, and a first sealing ring 33. The first sealing collar 31 is fixedly installed on the top of the silicone rubber sleeve 22, and the inner ring wall of the first sealing collar 31 is threaded. The first sealing ring 32 is fixedly installed on the bottom of the electrode connector 13, and the first sealing ring 32 is threadedly connected to the first sealing collar 31. The first sealing ring 33 is sleeved on the outer wall of the first sealing collar 31, and the first sealing ring 33 is provided with a sealing flange 34, which covers the connection between the first sealing ring 32 and the first sealing collar 31.

[0044] Reference Figure 2 After the first sealing ring 32 and the first sealing sleeve 31 are threaded together, the first sealing ring 33 is used to cover the first sealing sleeve 31 and the first sealing ring 32, thereby completing the connection and sealing work between the silicone rubber sleeve 22 and the electrode connector 13.

[0045] Reference Figure 2 and Figure 3 The second sealing assembly 4 includes a second sealing ring 41, a second sealing nut 42, and a second sealing ring 43. The second sealing ring 41 is fixedly installed at the bottom end of the silicone rubber sleeve 22, and threads are formed on its outer side wall. The second sealing nut 42 is fixedly installed on the connecting flange 21, and the second sealing ring 41 is threaded onto the second sealing nut 42. The second sealing ring 43 is sleeved on the second sealing nut 42 and covers the connection between the second sealing nut 42 and the second sealing ring 41. A sealing pad 44 is provided inside the second sealing nut 42, and the sealing pad 44 fills the gaps between the inner and outer sides of the second sealing ring 41 under the compression of the second sealing ring 41.

[0046] Reference Figure 2 The addition of a silicone rubber sleeve 22 to the outer casing of the tube body 11 provides the sleeve with excellent electrical insulation while also making it more resistant to high and low temperatures and aging compared to ceramic sleeves. This reduces the probability of deformation under temperature variations, ensuring structural stability and sealing. The first sealing component 3 and the second sealing component 4 ensure the sealing at the connection between the silicone rubber sleeve 22 and the electrode connector 13 and the connecting flange 21, thereby improving the overall sealing performance when the sleeve is connected to the capacitor, resulting in stability and durability.

[0047] Reference Figure 2 and Figure 3A protective cover 14 is provided on the connecting flange 21. A snap-fit ​​assembly 5 is installed on the protective cover 14, which is used to fix the protective cover 14 to the connecting flange 21. The snap-fit ​​assembly 5 includes a snap block 51, a snap spring 52, and a pull rod 53. A horizontal sliding groove 54 is formed on the inner wall of the protective cover 14, and the snap block 51 is slidably installed in the sliding groove 54. One end of the snap spring 52 is fixedly installed on the inner bottom wall of the sliding groove 54, and the other end of the snap spring 52 is connected to the snap block 51. Under the action of the snap spring 52, the snap block 51 partially extends out of the sliding groove 54 and abuts against the outer wall of the connecting flange 21. An arc-shaped guide surface 55 is formed on the side wall of the snap block 51 near the opening of the protective cover 14. The pull rod 53 is horizontally slidably installed on the protective cover 14, with one end of the pull rod 53 located outside the protective cover 14 and the other end connected to the snap block 51.

[0048] Reference Figure 2 and Figure 3 When the protective cover 14 covers the connecting flange 21, the guide surface 55 on the locking block 51 will first contact the connecting flange 21. The guide surface 55 will generate a component force to drive the locking block 51 into the sliding groove 54. After the protective cover 14 covers the connecting flange 21, the locking block 51 will partially extend out of the sliding groove 54 under the action of the locking spring 52 and press against the outer wall of the connecting flange 21, thus completing the position fixing of the protective cover 14 on the connecting flange 21. The protective cover 14 covers the surface of the connecting flange 21, thereby improving the surface sealing of the connecting flange 21 and reducing the probability of corrosion or damage to the connecting flange 21 due to the influence of wind, sand and rain in the external environment, thus improving the service life of the connecting flange 21.

[0049] The working principle of this application embodiment is as follows:

[0050] The silicone rubber sleeve 22, installed over the tube body 11, provides excellent electrical insulation while being more resistant to high and low temperatures and aging compared to ceramic sleeves. This reduces the probability of deformation of the sleeve under temperature variations, ensuring structural stability and sealing. The first sealing component 3 and the second sealing component 4 ensure the sealing at the connection between the silicone rubber sleeve 22 and the electrode connector 13 and the connecting flange 21, thereby improving the overall sealing performance when the sleeve is connected to the capacitor, resulting in stability and durability.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bushing for a three-phase power capacitor, characterized in that: The device includes a tube (11) and a conductive rod (12) disposed inside the tube (11). An electrode connector (13) is provided at the top of the tube (11). One end of the conductive rod (12) is connected to the electrode connector (13), and the other end of the conductive rod (12) is connected to the inside of a capacitor. A connecting mechanism (2) is provided at the bottom of the tube (11). The tube (11) is connected to the capacitor via the connecting mechanism (2). The connecting mechanism (2) includes: A connecting flange (21) is provided at the bottom end of the pipe body (11), and the pipe body (11) is connected to the capacitor through the connecting flange (21); A silicone rubber sleeve (22) is fitted onto the tube body (11). The silicone rubber sleeve (22) is provided with a first sealing component (3) and a second sealing component (4). The top of the silicone rubber sleeve (22) is connected to the electrode connector (13) through the first sealing component (3). The first sealing component (3) seals the connection between the silicone rubber sleeve (22) and the electrode connector (13). The bottom of the silicone rubber sleeve (22) is connected to the connecting flange (21) through the second sealing component (4). The second sealing component (4) seals the connection between the silicone rubber sleeve (22) and the connecting flange (21).

2. A bushing for a three-phase power capacitor according to claim 1, characterized in that: The first sealing assembly (3) includes: The first sealing ring (31) is disposed at the top of the silicone rubber sleeve (22), and the inner ring wall of the first sealing ring (31) is threaded. The first sealing ring (32) is disposed on the electrode connector (13) and is threadedly connected to the first sealing sleeve (31); The first sealing ring (33) is sleeved on the outer wall of the first sealing sleeve (31). The first sealing ring (33) is provided with a sealing flange (34), which covers the connection between the first sealing ring (32) and the first sealing sleeve (31).

3. A bushing for a three-phase power capacitor according to claim 1, characterized in that: The second sealing assembly (4) includes: The second sealing ring (41) is disposed at the bottom end of the silicone rubber sleeve (22), and the outer side wall of the second sealing ring (41) is threaded. The second sealing nut (42) is provided on the connecting flange (21), and the second sealing ring (41) is threadedly connected to the second sealing nut (42); The second sealing ring (43) is fitted onto the second sealing nut (42) and the second sealing ring (43) covers the connection between the second sealing nut (42) and the second sealing ring (41).

4. A bushing for a three-phase power capacitor according to claim 3, characterized in that: The second sealing nut (42) is provided with a sealing pad (44), which fills the gap between the inner and outer walls of the second sealing ring (41) under the squeezing action of the second sealing ring (41).

5. A bushing for a three-phase power capacitor according to claim 1, characterized in that: The connecting flange (21) is covered with a protective cover (14), and a snap-fit ​​assembly (5) is provided on the protective cover (14). The protective cover (14) is fixed to the connecting flange (21) by the snap-fit ​​assembly (5), and the protective cover (14) covers the surface of the connecting flange (21).

6. A bushing for a three-phase power capacitor according to claim 5, characterized in that: The snap-fit ​​assembly (5) includes: The locking block (51) has a horizontal sliding groove (54) on the inner side wall of the protective cover (14), and the locking block (51) is slidably installed on the sliding groove (54); A snap-fit ​​spring (52) is provided on the bottom wall of the sliding groove (54) and connected to the snap-fit ​​block (51). Under the action of the snap-fit ​​spring (52), the snap-fit ​​block (51) extends out of the sliding groove (54) and abuts against the outer wall of the connecting flange (21). A pull rod (53) is horizontally slidably mounted on a protective cover (14). One end of the pull rod (53) is located outside the protective cover (14), and the other end of the pull rod (53) is connected to a locking block (51).

7. A bushing for a three-phase power capacitor according to claim 6, characterized in that: An arc-shaped guide surface (55) is provided on the side wall of the end of the card block (51) that protrudes from the sliding groove (54) and is close to the opening of the protective cover (14).

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