Integrated explosion-proof cabinet

Abstract

The utility model discloses an integrated explosion-proof cabinet, which is characterized in that an electrical room is arranged in a fully-sealed metal cabinet with an IP grade of IP67, and a three-phase integrated sleeve for high-voltage input at a wire inlet side, a three-station isolating switch, three vacuum arc-extinguishing units and a cable cabin are longitudinally and sequentially arranged in the electrical room; after the scheme is adopted, the explosion-proof cabinet has good air tightness, explosion is controlled in the cabinet, sparks, electric arcs and dangerous temperature in the shell can be isolated from harmful gas, dust or steam around the shell, and the size of the cabinet is greatly reduced on the premise that the safe creepage distance between electrified bodies is guaranteed.

Description

Technical Field

[0001] This utility model relates to an explosion-proof cabinet. Background Technology

[0002] Most existing ring main units are SF6 gas-filled ring main units, relying on SF6 for insulation and arc extinguishing. However, because SF6 is a greenhouse gas, leaks are a common occurrence in SF6-filled ring main units due to sealing issues. Once leaked, SF6 pollutes the environment. Ring main units are protected by explosion-proof membranes. When the internal pressure exceeds or equals the membrane's burst value, the internal pressure forces open the built-in piston, allowing gas to escape rapidly through an unobstructed channel. However, this method has drawbacks: some gas still pollutes the environment, or it may ignite upon contact with a flammable source. Furthermore, if the explosion-proof membrane fails to release pressure in time or is damaged, it may explode, endangering personnel safety and causing damage to public property.

[0003] Working in the humid, dusty, and harsh environment of underground mines places higher demands on the cabinets. Existing explosion-proof cabinets all use a sealed outer shell attached to the cabinet body. The shortcomings of this method are that the size is too large, which is not conducive to installation and transportation in the mine, and secondly, it is not convenient for observation and operation. Utility Model Content

[0004] The purpose of this utility model is to provide an environmentally friendly, fully enclosed, double-layered, and compact medium-voltage explosion-proof cabinet that uses insulating gas.

[0005] To achieve the above objectives, this utility model provides an integrated explosion-proof cabinet, comprising an operating mechanism room, an electrical room, and a cable compartment. The electrical room is characterized by being housed within a fully sealed metal cabinet with an IP67 rating. The insulating medium in the electrical room is environmentally friendly dry air. Within the electrical room, a three-phase integrated bushing for high-voltage input on the inlet side, a three-position disconnect switch, three vacuum arc-extinguishing units, and the cable compartment are arranged longitudinally in sequence. The solid-sealed poles of the vacuum arc-extinguishing units are arranged along the depth of the cabinet. The three-phase integrated bushing for high-voltage input and the output cable bushing of the cable compartment are arranged in parallel.

[0006] The air clearance between live parts in the electrical room shall be greater than or equal to 125 mm.

[0007] When the distance between live parts in the electrical room is less than 125mm, insulating partitions are installed between the live parts.

[0008] The electrical room is equipped with an infrared camera.

[0009] The vacuum interrupter unit consists of an external epoxy resin and an internal vacuum interrupter chamber, with the inlet and outlet terminals and the vacuum interrupter chamber arranged in a straight line along the longitudinal direction.

[0010] With the above solution, the explosion-proof cabinet has excellent airtightness, controlling the explosion internally and isolating sparks, arcs, and dangerous temperatures inside the enclosure from harmful gases, dust, or vapors around the enclosure, preventing them from becoming ignition points in a hazardous environment. The new design significantly reduces the cabinet's size while ensuring safe creepage distances between live parts. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a front view of the explosion-proof cabinet of this utility model.

[0013] Label Explanation:

[0014] 1. Three-phase integrated bushing; 2. Solid-sealed pole of vacuum arc extinguishing unit; 3. Three-position disconnecting switch; 4. Stainless steel gas chamber; 5. Metal stainless steel enclosure; 6. Cable bushing; 7. Air pressure gauge; 8. Observation window; 9. Three-position disconnecting switch operating mechanism; 10. Operating mechanism of vacuum circuit breaker or vacuum load switch. Detailed Implementation

[0015] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0016] Please see Figure 1 as well as Figure 2 This utility model consists of an operating mechanism and an electrical compartment. The electrical compartment is longitudinally arranged with a three-phase integrated bushing 1 for high-voltage input on the incoming side, a three-position disconnect switch 3, a solid-sealed pole 2 for the vacuum interrupter unit, and an outgoing cable bushing 6. A current transformer and a sensor with live display function can be placed at the incoming end. The solid-sealed pole of the vacuum interrupter unit can be a vacuum load switch or a vacuum circuit breaker, depending on the requirements. In this embodiment, the vacuum interrupter unit includes an external epoxy resin casing and an internal vacuum interrupter chamber. The incoming and outgoing ends are aligned longitudinally with the vacuum interrupter chamber. The three-phase integrated bushing 1 for high-voltage input and the output cable bushing 6 of the cable compartment are arranged parallel to each other. Combined with the longitudinally designed vacuum interrupter unit, this utility model can significantly reduce the amount of copper busbars used and also reduce the cabinet size. The electrical compartment of this utility model is set inside the stainless steel air chamber 4 of a fully sealed metal stainless steel box 5 with an IP rating of IP67. The insulating medium of the electrical compartment is environmentally friendly dry air. The air clearance between the live parts in the electrical compartment is greater than or equal to 125mm. When the distance between the live parts in the electrical compartment is less than 125mm, an insulating partition is provided between the live parts.

[0017] To facilitate observation of the working status of the three-position disconnect switch, the electrical room is equipped with an infrared camera and a glass observation window 8 on the cabinet panel, which can observe the position of the grounding switch. The cabinet is also equipped with an air pressure gauge 7 that can indicate the air pressure of the air box, a three-position disconnect switch operating mechanism 9, and an operating mechanism for the vacuum circuit breaker or vacuum load switch.

[0018] This novel explosion-proof enclosure possesses excellent airtightness, confining the explosion internally and isolating sparks, arcs, and dangerous temperatures within the enclosure from surrounding harmful gases, dust, or vapors, preventing them from becoming ignition points for a hazardous environment. In the event of an explosion within the enclosure, the combustion mixture and hot gases must be sufficiently confined to prevent the ignition of any potentially explosive gas mixtures present outside the equipment. To prevent the release of combustion or high-temperature gases, the enclosure must have sufficient strength to withstand the pressure generated by an internal explosion. It is both explosion-proof and explosion-resistant. During an explosion, gases will escape through any channels or openings present within the enclosure.

[0019] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent shape or structural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An integrated explosion-proof cabinet, comprising an operating mechanism room, an electrical room, and a cable compartment, characterized in that: The electrical room is housed in a fully sealed metal cabinet with an IP67 rating. The insulation medium for the electrical room is environmentally friendly dry air. The electrical room is arranged longitudinally with a three-phase integrated bushing for the high-voltage input on the incoming side, a three-position disconnect switch, three vacuum arc-extinguishing units, and a cable compartment. The solid-sealed poles of the vacuum arc-extinguishing units are arranged along the depth of the cabinet. The three-phase integrated bushing for the high-voltage input and the output cable bushing of the cable compartment are arranged in parallel.

2. The integrated explosion-proof cabinet as described in claim 1, characterized in that: The air clearance between live parts in the electrical room shall be greater than or equal to 125 mm.

3. The integrated explosion-proof cabinet as described in claim 1, characterized in that: When the distance between live parts in the electrical room is less than 125mm, insulating partitions are installed between the live parts.

4. The integrated explosion-proof cabinet as described in claim 1, characterized in that: The electrical room is equipped with an infrared camera.

5. The integrated explosion-proof cabinet as described in claim 1, characterized in that: The vacuum interrupter unit consists of an external epoxy resin and an internal vacuum interrupter chamber, with the inlet and outlet terminals and the vacuum interrupter chamber arranged in a straight line along the longitudinal direction.

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