An adjustable switchgear pressure relief device

Abstract

The invention discloses an adjustable switch cabinet pressure release device, which comprises a connection assembly, a bottom cover assembly and a piston assembly, wherein the connection assembly includes a vertical cylinder and a top plate arranged at the top of the vertical cylinder, the top plate is provided with a punched hole and at least one exhaust hole; the bottom cover assembly includes a connection ring detachably connected with the lower end of the vertical cylinder and a variable diameter area connected to the lower end of the connection ring; and the piston assembly includes a piston head located inside the vertical cylinder and a piston rod fixed at the upper end of the piston head, a plurality of vertical throttling screw holes are distributed on the piston head, the upper end of the piston rod passes through the punched hole and is connected with a cover assembly at the upper end, and the variable diameter area and the piston head are provided with a blocking ball therebetween. The device can effectively evacuate and discharge a high temperature and high pressure gas inside the switch cabinet, thereby playing a role of rapid and timely pressure release and explosion protection, and having excellent safety.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to an adjustable switch cabinet pressure relief device. Background technique [0002] Switchgear is a kind of switchgear suitable for power consumption occasions. Its main function is to switch, control and protect the power system during the process of power generation, transmission, distribution and power conversion. It is mainly used in power plants and substations. , petrochemical, metallurgical steel rolling, light industry textiles, factories and mines, residential quarters, high-rise buildings and other different occasions. [0003] During the use of the switchgear, the internal arc fault is a short circuit caused by various reasons. It is the most serious fault of the switchgear. The arc produces thermal effects and pressure effects. If the high-temperature and high-pressure gas cannot be effective in a very short time in a narrow cabinet If it is released,...

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Problems solved by technology

[0003] During the use of the switchgear, the internal arc fault is a short circuit caused by various reasons. It is the most serious fault of the switchgear. The arc produces thermal effects and pressure effects. If the high-temperature and high-pressure gas cannot be effective in a very short time in a narrow cabinet release, it will cause the switchgear to burst and hurt personal safety

[0004] The existing pressure relief device is to set a cover plate on the top of the switch cabinet. One end of the cover plate is connected to the switch cabinet by a hinge, and the other end is fixed by a nylon screw. When a short circuit accident occurs in the switch cabinet, the gas temperature in the switch cabinet And the pressure rises, the nylon screw is melted by the high-temperature gas in the switch cabinet, and the high-pressure gas in the switch cabinet bounces the cover plate to release the pressure. However, this traditional pressure relief device is affected by the size of the cover plate, and often due to The pressure relief channel is small, so that the high-temperature and high-pressure gas cannot be discharged in time, causing the switchgear to deform or even explode; in addition, the high-temperature and high-pressure gas in the switchgear will Further accumulation, when the high-temperature and high-pressure gas accumulates too quickly, although the dragon screw has not completely melted, the switchgear can no longer withstand the pressure of the internal high-temperature and high-pressure gas and explodes. Even if the nylon screw can be completely melted, the high-temperature and high-pressure gas has already The pressure inside the switchgear has been accumulated for a period of time, and the pressure is still very high. At this time, the high-temperature and high-pressure gas will bounce the cover plate at high speed, and the cover plate will rotate around the hinge at high speed, which will easily break the hinge, and the cover plate will fly out, which may accidentally injure the staff. , there are potential safety hazards; in addition, it is impossible to set sealing measures such as sealing strips at the frame of the cover plate, which makes it easier for dust to enter the high-voltage compartment and pollute the high-voltage conductors, affect the internal insulation strength, and increase short-circuit faults

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