A breathable pressure relief mechanism

Abstract

The invention discloses a breathable pressure relief mechanism which comprises a connecting assembly, a bottom cover assembly, a piston assembly and a capping assembly. The connecting assembly comprises a vertical barrel and a fixed ring located on the periphery of the vertical barrel; the inner side edge of the fixed ring is connected with the top part of the vertical barrel through a connecting area; breathable holes are distributed in the connecting area; a top plate is arranged on the top part of the vertical barrel; the bottom cover assembly comprises a connecting ring detachably connected with the lower end of the vertical barrel and a reducing area connected to the lower end of the connecting ring; the piston assembly comprises a piston head located in the vertical barrel and a piston rod fixed to the upper end of the piston head; the upper end of the piston rod penetrates through the top plate; and the capping assembly is capped on the upper part of the fixed ring. The breathable pressure relief mechanism provided by the invention can be used for effectively evacuating and discharging high-temperature high-pressure gas in a switch cabinet, plays a role in quickly and timely relieving pressure and preventing explosion, and has excellent safety.

Description

Technical field [0001] The invention relates to the technical field of power equipment, in particular to a breathable pressure relief mechanism. Background technique [0002] Switchgear is a kind of switchgear suitable for power use occasions. Its main function is to open and close, control and protect in the process of power generation, transmission, distribution and power conversion in the power system. It is mainly used in power plants and substations. , Petrochemicals, metallurgical steel rolling, light industry and textiles, factories and mining enterprises and residential quarters, high-rise buildings and other various 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 heat and pressure effects. If the high temperature and high pressure gas is in a narrow cabinet, it cannot be effective in a very short time. Release will cause the switchgea...

AI Technical Summary

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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