Upper isolation vacuum circuit breaker switch of environment-friendly cabinet

Abstract

An upper isolation vacuum circuit breaker switch of an environment-friendly cabinet comprises a switch frame, an upper isolation part and a lower circuit breaker part, the upper isolation part and the lower circuit breaker part are installed on the switch frame, and the upper isolation part comprises an isolation main shaft and three isolation blades installed on the isolation main shaft in parallel. The switch frame is also provided with three independent isolation contact seats. When the isolation main shaft rotates, the three isolation blades can be driven to respectively contact with the corresponding isolation contact seats. The lower circuit breaker part comprises a circuit breaker main shaft and three vacuum circuit breakers, three driving connecting levers are arranged on the circuit breaker main shaft, each driving connecting lever is connected with an insulating pull rod of the corresponding vacuum circuit breaker, the static ends of the vacuum circuit breakers are connected with pin shafts of the corresponding isolation blades, and the static ends of the vacuum circuit breakers are connected with the pin shafts of the isolation blades. A movable end of the vacuum circuit breaker is arranged on an insulating pull rod of the vacuum circuit breaker, and the insulating pull rod moves upwards to enable the movable end and the static end of the vacuum circuit breaker to be communicated. When the environment-friendly cabinet is overhauled, the moving end in the vacuum circuit breaker is separated from the static end, then the isolation blades are separated from the isolation contact seat, and at the moment, the isolation blades at the two ends are not in contact with any part, so that the isolation operation is completed. The isolation operation fracture is arranged above the main fracture of the vacuum arc-extinguishing chamber, so that the safety of operation and maintenance is improved.

Description

Technical Field

[0001] The utility model relates to an electrical device, in particular to an upper isolation vacuum circuit breaker switch used in an environmental protection cabinet. Background Art

[0002] Most of the existing gas switch cabinets are mainly insulated by air, nitrogen and SF6 gas. Air insulation lacks the high-voltage live parts exposed to the air environment, which is easily affected by external dust, dirt, water vapor, etc. The reliability is low, and the cabinet needs to be larger. The insulation performance and arc extinguishing ability of nitrogen are still relatively poor compared with sulfur hexafluoride. If the insulation distance is increased, the gas cabinet will lose the advantage of small footprint. SF6 gas is an insulating medium. Although it has good insulation performance and mature technology, SF6 gas is a greenhouse gas, which has a great impact on the environment and is not easy to recycle. Secondly, if the SF6 gas cabinet leaks, it will have a great impact on the safety and reliability of the switch. Sulfur hexafluoride will produce toxic byproducts, so the used sulfur hexafluoride is regarded as hazardous waste. There are extremely high requirements for switch equipment, process, and gas box sealing.

[0003] The existing technology has the following shortcomings: most switch module circuit breakers are horizontal. The vacuum circuit breaker is not completely sealed. After long-term operation, oxidation is prone to occur inside, affecting operational safety. The isolating switch part is an integral structure, and the frame and the isolating shaft are connected with nylon material. Long operation time causes the isolating knife to jam. And the isolation module is an integral structure with a small electrical safety distance between phases. A certain insulation safety distance must be ensured between the metal box, which occupies more space in the switch cabinet and increases the cabinet size. It will increase the production cost of the environmental protection cabinet. Summary of the invention

[0004] The purpose of the utility model is to provide a top-isolating vacuum circuit breaker switch for an environmental protection cabinet which can improve the operational safety in view of the defects and shortcomings of the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the upper isolation vacuum circuit breaker switch of the environmental protection cabinet comprises a switch frame and an upper isolation part and a lower circuit breaker part installed on the switch frame, the upper isolation part comprises an isolation main shaft and three isolation blades installed in parallel on the isolation main shaft, and three independent isolation contact seats are also installed on the switch frame, and when the isolation main shaft rotates, the three isolation blades can be driven to contact the corresponding isolation contact seats respectively; the isolation main shaft comprises an epoxy resin rotating shaft and an insulating support sleeve, and the insulating support sleeve fixes the three isolation blades at intervals; the lower circuit breaker part comprises a circuit breaker main shaft and three vacuum circuit breakers, and three driving crank arms are arranged on the circuit breaker main shaft, each driving crank arm is connected to the insulating pull rod of the corresponding vacuum circuit breaker, the static end of the vacuum circuit breaker is connected to the pin shaft of the corresponding isolation blade, and the moving end of the vacuum circuit breaker is arranged on the insulating pull rod of the vacuum circuit breaker, and the moving end of the vacuum circuit breaker can be connected with the static end when the insulating pull rod moves upward.

[0006] The front end of the isolation main shaft is provided with an isolation operation unit which can drive the isolation main shaft to rotate.

[0007] The front end of the circuit breaker main shaft is provided with a circuit breaker operating unit capable of driving the circuit breaker main shaft to rotate.

[0008] The isolating contact seat is provided with an umbrella skirt.

[0009] The bottom of the moving end of the vacuum circuit breaker is connected to the high-voltage incoming line terminal of the environmental protection cabinet through a wire.

[0010] The isolation contact seat is connected to the side expansion sleeve of the environmental protection cabinet.

[0011] The switch frame comprises an upper fixing plate and a lower fixing plate, the upper isolating part is mounted on the upper fixing plate, and the lower circuit breaker part is mounted on the lower fixing plate.

[0012] The lower fixed plate is provided with a connecting plate, on which a grounding contact seat is installed. The grounding contact seat corresponds to the isolation blade, and when the isolation main shaft rotates, the isolation blade can be driven to contact the grounding contact seat.

[0013] The isolating contact seat, the grounding contact seat, and the static end of the vacuum circuit breaker are located on the three vertices of the triangle in a clockwise direction.

[0014] When the utility model is used for maintenance of the environmental protection cabinet, the circuit breaker main shaft is first controlled to rotate by the circuit breaker operating unit, and the insulating pull rod of the vacuum circuit breaker is driven downward by the driving crank arm, so that the moving end inside the vacuum circuit breaker is separated from the contact of the static end, and the vacuum circuit breaker cuts off the circuit. Then the isolation operating unit controls the rotation of the isolation main shaft to separate the isolation blade from the isolation contact seat. At this time, the isolation blades at both ends do not contact any parts, and the isolation operation is completed. Because the isolation operation break is above the main break of the vacuum interrupter, the safety of operation and maintenance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model installed in an environmental protection cabinet.

[0016] Figure 2 It is a structural schematic diagram of the utility model.

[0017] Figure 3 It is a schematic diagram of the back structure of the utility model.

[0018] Figure 4 It is a schematic diagram of the structure of the operating unit of the utility model. DETAILED DESCRIPTION

[0019] like Figure 1 As shown, the utility model is an upper isolation vacuum circuit breaker switch of an environmental protection cabinet, which is installed in a metal box 2 of an environmental protection cabinet 1, and includes a switch frame 3 and an upper isolation part and a lower circuit breaker part installed on the switch frame 3. The switch frame 3 includes an upper fixing plate 3-1 and a lower fixing plate 3-2, the upper isolation part is installed on the upper fixing plate 3-1, and the lower circuit breaker part is installed on the lower fixing plate 3-2.

[0020] like Figure 2 , Figure 3 , Figure 4 As shown, the upper isolation part includes an isolation main shaft 7 and three isolation blades 8 installed in parallel on the isolation main shaft 7. The front end of the isolation main shaft 7 is provided with an isolation operation unit 15 that can drive the isolation main shaft 7 to rotate. Three independent isolation contact seats 9 are also installed on the upper fixed plate 3-1 of the switch frame 3. When the isolation main shaft 7 rotates, it can drive the three isolation blades 8 to contact the corresponding isolation contact seats 9 respectively, so that the isolation blades 8 are connected to the isolation contact seats 9. The isolation contact seats 9 are provided with umbrella skirts to solve the problem of small electrical safety distance between phases. The isolation contact seats 9 are connected to the side expansion sleeve 11 above the environmental protection cabinet 1 for output. The isolation main shaft 7 includes an epoxy resin rotating shaft 7-1 and an insulating support sheath 7-2. The insulating support sheath 7-2 fixes the three isolation blades 8 at intervals, which not only ensures the electrical safety distance but also increases the transmission strength and durability of the isolation main shaft 7.

[0021] The lower circuit breaker part includes a circuit breaker main shaft 5 and three parallel vacuum circuit breakers 4. The front end of the circuit breaker main shaft 5 is provided with a circuit breaker operating unit 14 that can drive the circuit breaker main shaft 5 to rotate. Three driving crank arms 6 are provided on the circuit breaker main shaft 5. Each driving crank arm 6 is connected to the insulating pull rod of the corresponding vacuum circuit breaker 4. The static end of the vacuum circuit breaker 4 is connected to the pin shaft of the corresponding isolation blade 8. The moving end of the vacuum circuit breaker 4 is provided on the insulating pull rod of the vacuum circuit breaker 4. The insulating pull rod moves upward to connect the moving end of the vacuum circuit breaker 4 with the static end. The bottom of the moving end of the vacuum circuit breaker 4 is connected to the high-voltage incoming line terminal 13 of the environmental protection cabinet 1 through a wire 12. Therefore, when the moving end of the vacuum circuit breaker 4 is connected to the static end, the high-voltage current can reach the isolation blade 8 through the vacuum circuit breaker 4.

[0022] When the vacuum circuit breaker 4 is connected and the isolating blade 8 contacts the isolating contact seat 9, the high voltage current sequentially passes through the high voltage incoming line terminal 13, the vacuum circuit breaker 4, the isolating blade 8, the isolating contact seat 9, and is finally connected from the side expansion bushing 11.

[0023] The lower fixed plate 3-2 is provided with a connecting plate, on which a grounding contact seat 10 is mounted, the grounding contact seat 10 corresponds to the isolation blade 8, and when the isolation main shaft 7 rotates, it can drive the isolation blade 8 to contact the grounding contact seat 10. The isolation contact seat 9, the grounding contact seat 10, and the static end of the vacuum circuit breaker 4 are located at the three vertices of the triangle in a clockwise direction.

[0024] When the environmental protection cabinet 1 is overhauled, the utility model first controls the rotation of the circuit breaker main shaft 5 through the circuit breaker operating unit 14, and drives the insulating pull rod of the vacuum circuit breaker 4 to move downward by driving the crank arm 6, so that the moving end inside the vacuum circuit breaker 4 is separated from the contact of the static end, and the vacuum circuit breaker 4 cuts off the circuit. Then the isolation operating unit 15 controls the rotation of the isolation main shaft 7 to separate the isolation blade 8 from the isolation contact seat 9. At this time, the isolation blades 8 at both ends do not contact any parts, and the isolation operation is completed. Because the isolation operation break is above the main break of the vacuum interrupter, the safety of operation and maintenance is improved.

Claims

1. An upper isolation vacuum circuit breaker switch of an environmental protection cabinet, which comprises a switch frame and an upper isolation part and a lower circuit breaker part installed on the switch frame, characterized in that The upper isolation part includes an isolation main shaft and three isolation blades installed in parallel on the isolation main shaft. Three independent isolation contact seats are also installed on the switch frame. When the isolation main shaft rotates, it can drive the three isolation blades to contact the corresponding isolation contact seats respectively; the isolation main shaft includes an epoxy resin rotating shaft and an insulating support sleeve, and the insulating support sleeve fixes the three isolation blades at intervals; the lower circuit breaker part includes a circuit breaker main shaft and three vacuum circuit breakers. Three driving crank arms are arranged on the circuit breaker main shaft, each driving crank arm is connected to the insulating pull rod of the corresponding vacuum circuit breaker, the static end of the vacuum circuit breaker is connected to the pin shaft of the corresponding isolation blade, the moving end of the vacuum circuit breaker is arranged on the insulating pull rod of the vacuum circuit breaker, and the moving end of the vacuum circuit breaker can be connected with the static end when the insulating pull rod moves upward.

2. The upper isolation vacuum circuit breaker switch of the environmental protection cabinet according to claim 1, characterized in that The front end of the isolation main shaft is provided with an isolation operation unit which can drive the isolation main shaft to rotate.

3. The upper isolation vacuum circuit breaker switch of the environmental protection cabinet according to claim 1, characterized in that The front end of the circuit breaker main shaft is provided with a circuit breaker operating unit capable of driving the circuit breaker main shaft to rotate.

4. The upper isolation vacuum circuit breaker switch of the environmental protection cabinet according to claim 1, characterized in that The isolating contact seat is provided with an umbrella skirt.

5. The upper isolation vacuum circuit breaker switch of the environmental protection cabinet according to claim 1, characterized in that The bottom of the moving end of the vacuum circuit breaker is connected to the high-voltage incoming line terminal of the environmental protection cabinet through a wire.

6. The upper isolation vacuum circuit breaker switch of the environmental protection cabinet according to claim 1, characterized in that The isolation contact seat is connected to the side expansion sleeve of the environmental protection cabinet.

7. The upper isolation vacuum circuit breaker switch of the environmental protection cabinet according to any one of claims 1 to 6, characterized in that The switch frame comprises an upper fixing plate and a lower fixing plate, the upper isolating part is mounted on the upper fixing plate, and the lower circuit breaker part is mounted on the lower fixing plate.

8. The upper isolation vacuum circuit breaker switch of the environmental protection cabinet according to claim 7, characterized in that The lower fixed plate is provided with a connecting plate, on which a grounding contact seat is installed. The grounding contact seat corresponds to the isolation blade, and when the isolation main shaft rotates, the isolation blade can be driven to contact the grounding contact seat.

9. The upper isolation vacuum circuit breaker switch of the environmental protection cabinet according to claim 8, characterized in that The isolating contact seat, the grounding contact seat, and the static end of the vacuum circuit breaker are located on the three vertices of the triangle in a clockwise direction.

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