Pressure-relief and antibump apparatus of low-voltage draw-out switch cabinet

Abstract

The invention relates to a reliable pressure-relief and antibump apparatus of a low-voltage draw-out switch cabinet, wherein the apparatus has a simple structure; and the operation of the equipment is safe according to the invention. The apparatus has a cabinet body. A plurality of unit cells are arranged in the cabinet body; longitudinal pressure-relief channels are arranged at two sides of the cabinet body; the pressure-relief channels are communicated with pressure-relief devices in the unit cells, wherein the pressure-relief devices comprises pressure-relief baffles that are installed on separator boards of the unit cells and active pressure-relief baffles that are installed on the pressure-relief baffles actively. According to the invention, an articulated form is applied to a structure design, so that the pressure-relief and antibump apparatus is flexible and reliable when the apparatus is opened and closed. The apparatus is composed of sheet metal workpieces and self-tapping screws and has good craftiness. In addition, the apparatus has unique design concept and a blank of the low-voltage switch cabinet product can be filled in the aspect. Therefore, the apparatus provided in the invention has high popularization application value.

Description

technical field [0001] The patent of the present invention relates to a pressure relief and anti-riot device for a low-voltage drawer-type switch cabinet. Background technique [0002] At present, when a short-circuit fault occurs in the outlet circuit of the outlet functional unit cell (hereinafter referred to as the unit cell) of the low-voltage drawer-type switchgear, the circuit breaker installed in the cell is broken and the faulty circuit is cut off. [0003] When the circuit breaker cuts off the faulty circuit, a large arc will be ejected from the extinguishing shield of the circuit breaker in an instant. Due to the action of the arc, the air medium is ionized, and high-temperature and high-pressure gas is instantly generated in the unit cell. [0004] At present, the structure of the pressure relief anti-riot device for high-voltage switchgear produced at home and abroad is to set a hole on the top plate of the top cabinet above the handcart room of the circuit break...

AI Technical Summary

Problems solved by technology

[0005] In the low-voltage drawer-type switchgear, the feeder cabinet is generally an outlet circuit with multiple unit cells in a single cabinet (generally 3 to 9 circuits). , it is more difficult in structural design

At present, only the MNS type low-voltage switchgear has dealt with this problem in the structural design. It uses the high-pressure gas generated during the fault to push the drawer body in the unit cell outward by about 8-10mm, and the drawer mouth and the cabinet body A gap of about 8 to 10mm is formed between them for pressure relief. Due to the contact pressure between the dynamic and static contacts of the drawer, the weight of the drawer body, and the sliding friction between the drawer body and the bottom of the unit cell, the high-pressure gas in the cell will move outward against the drawer body. The thrust constitutes a large resistance, and the pressure can only be released after the gas pressure in the unit cell increases to overcome the above resistance, and the gap of 8-10mm is too small, and the opening area for pressure relief only occupies the drawer 12% of the mouth area, so it forms a bottleneck effect, resulting in poor pressure relief effect, and has certain destructive effects on the structural components in the unit cell

Other types of low-voltage switchgear (such as GCK type, GCS type, etc.) have not taken pressure relief and anti-riot measures in the structural design. Therefore, after the above-mentioned fault occurs, the structural components in the unit cell are deformed and the cell door is violently opened. , not only the power distribution equipment is damaged, but also poses a great threat to personal and safe operation

Images