Sealing structure of end cover and three-position switch mechanism

Abstract

The utility model relates to the field of circuit breaker provides a kind of sealing structure and three-position switch mechanism of end cover, the sealing structure of end cover includes insulating shell and sealing structure, screw rod is provided in insulating shell;Sealing structure includes the end plate with central through-hole and the sleeve that is sleeved between end plate and screw rod, dynamic sealing ring and lubricating member are provided between sleeve and screw rod;Sleeve is provided with stepped portion, and the stepped surface of stepped portion is provided with first sealing element between end plate, and the end surface between end plate and insulating shell is provided with second sealing element. Assembled by end plate and sleeve, corresponding material can be selected according to shape to produce, material waste during production can be greatly reduced, to reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of circuit breakers, specifically to a sealing structure for an end cap and a three-position switch mechanism. Background Technology

[0002] A three-position vacuum circuit breaker operates under a vacuum, also known as a three-position vacuum circuit breaker. It includes three positions: isolation, grounding, and load breaking. The isolation position completely isolates electrical equipment from the power system, ensuring the equipment under maintenance is not energized, avoiding the risk of electric shock, protecting maintenance personnel, and effectively preventing accidents such as short circuits and fires caused by equipment failure. The grounding position reliably connects the casing of electrical equipment or other metal parts that may come into contact with live parts to the earth, thereby reducing the voltage when the equipment leaks current and preventing electric shock. During equipment maintenance, the grounding position also releases any residual charge in the equipment to the earth, further ensuring the safety of the maintenance work. The load breaking position controls the flow of current in the power system, connecting or disconnecting the circuit. When the circuit needs to be energized, the load breaking position quickly closes its contacts, allowing current to flow smoothly; when the circuit needs to be de-energized, the load breaking position decisively opens its contacts, cutting off the current path.

[0003] Therefore, a sealing device is required for three-position vacuum circuit breakers. The existing end cover design adopts an integrated structure, which results in a waste of materials in production due to the stepped end cover structure, thus increasing production costs. Utility Model Content

[0004] The purpose of this invention is to provide a sealing structure for an end cap and a three-position switch mechanism, aiming to improve the problem of relatively high production costs of existing insulating housing end caps.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a sealing structure for an end cap, comprising:

[0006] An insulating housing containing a lead screw;

[0007] A sealing structure includes an end plate with a central through hole and a sleeve sleeved between the end plate and the lead screw, wherein a dynamic sealing ring and a lubricant are provided between the sleeve and the lead screw;

[0008] The sleeve is provided with a stepped portion, and a first sealing element is provided between the stepped surface of the stepped portion and the end plate, and a second sealing element is provided between the end plate and the end face of the insulating shell.

[0009] Preferably, the inner end face of the sleeve is provided with an arc-shaped surface.

[0010] Preferably, the end plate is provided with a plurality of first locking bolts for locking with the sleeve.

[0011] Preferably, the end plate is provided with a plurality of second locking bolts for securing to the insulating shell.

[0012] Preferably, a mating groove is provided on the inner end face of the sleeve.

[0013] Preferably, the sleeve is provided with a through hole that mates with the lead screw, and the diameter of the mating groove is larger than the diameter of the through hole.

[0014] A three-position switch mechanism is also provided, including the sealing structure of the end cap as described above.

[0015] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0016] 1. This utility model is assembled by end plates and sleeves, and can select appropriate materials for production according to the shape, which can greatly reduce material waste during production and reduce production costs.

[0017] 2. The sleeve end face of this utility model is provided with an arc-shaped surface, which can improve the electric field and enhance the insulation performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the sealing structure of the end cap described in this utility model;

[0019] Figure 2 This is a partial view of the sealing structure of the end cap described in this utility model;

[0020] Figure 3 This is a partial cross-sectional view of the sealing structure of the end cap described in this utility model;

[0021] Figure 4 This is a schematic diagram of the sleeve structure of the sealing structure of the end cap described in this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. Insulating housing; 101. Lead screw;

[0024] 20. Sealing structure; 201. End plate; 202. Sleeve; 203. Dynamic sealing ring; 204. Lubricating component; 205. First sealing component; 206. Second sealing component;

[0025] 2011, First locking bolt; 2012, Second locking bolt;

[0026] 2021, stepped section; 2022, curved surface; 2023, butt groove; 2024, through hole. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0028] Additionally, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are all based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element of this utility model must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] When an element is referred to as being "fixed to," "set on," or "contained on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to," it can be directly connected to or indirectly connected to that other element.

[0030] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Example 1

[0032] Please refer to Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a sealing structure for an end cap, including an insulating housing 10 and a sealing structure 20. A lead screw 101 is disposed inside the insulating housing 10. The sealing structure 20 includes an end plate 201 with a central through hole 2024 and a sleeve 202 sleeved between the end plate 201 and the lead screw 101. A dynamic sealing ring 203 and a lubricating element 204 are disposed between the sleeve 202 and the lead screw 101. A stepped portion 2021 is disposed on the sleeve 202. A first sealing element 205 is disposed between the stepped surface of the stepped portion 2021 and the end plate 201, and a second sealing element 206 is disposed between the end plate 201 and the end face of the insulating housing 10.

[0033] Specifically, at the port of the insulating housing 10, the assembly of the end plate 201 and the sleeve 202 forms a seal on the port of the insulating housing 10. Simultaneously, the lead screw 101 can rotate freely within the sleeve 202. Through the cooperation of the dynamic seal ring 203 and the lubricating element 204, the sealing and smooth operation of the lead screw 101 during rotation are ensured, effectively preventing the entry of external impurities and extending its service life. The dynamic seal ring 203 is made of high-temperature resistant material, ensuring good sealing performance even in high-temperature environments. The lubricating element 204 can be a bearing; a bearing can be designed on each side of the dynamic seal ring 203 to ensure stable rotation of the lead screw 101.

[0034] Furthermore, a first sealing element 205 is used to seal the end plate 201 and the sleeve 202, while a second sealing element 206 is used to seal the end plate 201 and the insulating housing 10. This design ensures sealing at all assembly points of the insulating housing 10, guaranteeing its overall sealing performance and safety. The first sealing element 205 and the second sealing element 206 can be sealing rings made of rubber, ensuring excellent sealing performance under various environmental conditions.

[0035] The separate design of the end plate 201 and sleeve 202 in this embodiment allows for production using two separate workpieces, reducing manufacturing costs, improving production efficiency, facilitating maintenance and replacement, and ensuring long-term stable operation of the equipment.

[0036] like Figure 2 and Figure 4 As shown, in this embodiment, the inner end face of the sleeve 202 is provided with an arc-shaped surface 2022. The design of the arc-shaped surface 2022 can improve the electric field and enhance the insulation performance.

[0037] like Figure 1 As shown, in this embodiment, the end plate 201 is provided with a plurality of first locking bolts 2011 that are locked to the sleeve 202. The end plate 201 and the sleeve 202 are locked together by bolts to ensure structural stability and prevent loosening.

[0038] like Figure 1 As shown, in this embodiment, the end plate 201 is provided with a plurality of second locking bolts 2012 for locking with the insulating shell 10. In this way, the end plate 201 can be locked onto the insulating shell 10, and the connection is secured by bolts to ensure a tight fit between the end plate 201 and the insulating shell 10, preventing loosening due to vibration. At the same time, the sealing effect can be further optimized by adjusting the tightening force of the bolts, ensuring the overall sealing performance and safety of the insulating shell 10.

[0039] like Figure 3As shown, in this embodiment, a mating groove 2023 is provided on the inner end face of the sleeve 202. The mating groove 2023 is designed to mate with the contact to ensure the cooperation between the contact and the sleeve 202, so as to form the state switching of the three-position switch mechanism, such as switching to the ground state or the open state, to meet the usage requirements of the insulating housing 10.

[0040] like Figure 3 and Figure 4 As shown, in this embodiment, the sleeve 202 is provided with a through hole 2024 that mates with the lead screw 101, and the diameter of the mating groove 2023 is larger than the diameter of the through hole 2024. This forms a through hole 2024 that seals with the lead screw 101, and a mating groove 2023 that mates with the contacts. The different diameters create the required structural fit, ensuring that the lead screw 101 is isolated from the outside environment during operation, preventing contamination and wear, while facilitating quick replacement and adjustment of the contacts, thus improving overall operating efficiency and reliability.

[0041] Example 2

[0042] This embodiment provides a three-position switch mechanism, including a sealing structure 20 for the end cap as described in Embodiment 1. The sealing structure 20 allows for sealed assembly of the ports of the three-position switch mechanism. Simultaneously, the assembly design of the end cap reduces structural complexity, simplifies the production process, lowers production costs, and improves production efficiency. Furthermore, the arc-shaped design of the inner end face of the sleeve 202 improves the electric field, enhances insulation performance, and increases practicality.

[0043] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A seal structure of an end cap, characterized by, include: An insulating housing containing a lead screw; A sealing structure includes an end plate with a central through hole and a sleeve sleeved between the end plate and the lead screw, wherein a dynamic sealing ring and a lubricant are provided between the sleeve and the lead screw; The sleeve is provided with a stepped portion, and a first sealing element is provided between the stepped surface of the stepped portion and the end plate, and a second sealing element is provided between the end plate and the end face of the insulating shell.

2. The seal structure of an end cap according to claim 1, characterized by: The inner end face of the sleeve is provided with an arc-shaped surface.

3. The seal structure of an end cap according to claim 1, characterized by: The end plate is provided with a plurality of first locking bolts for locking with the sleeve.

4. The seal structure of an end cap according to claim 1, characterized by: The end plate is provided with a plurality of second locking bolts for securing to the insulating shell.

5. The seal structure of an end cap according to claim 1 or 2, characterized by: A mating groove is provided on the inner end face of the sleeve.

6. The seal structure of an end cap according to claim 5, characterized in that: The sleeve is provided with a through hole that mates with the lead screw, and the diameter of the mating groove is larger than the diameter of the through hole.

7. A three-position switch mechanism characterized by comprising: The sealing structure includes the end cap as described in any one of claims 1 to 6.

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