Large-diameter upper wire leading-out and upper locking fuse

Abstract

The invention discloses a large-diameter upper wire leading-out and upper locking fuse, and the top of an insulating porcelain body is provided with a locking device. A fuse is fixed with a bonding post of a lower fuse tube, and passes through an upper fuse tube to be fixed at the upper end of the insulating porcelain body through the locking device. A part, in a central fuse tube, of the fuse is provided with a fusing part with a smaller diameter, and two ends of the fusing part are provided with fireproof caps. The fuse between the fireproof caps and the upper and lower fuse tubes is sleeved by a thermal shrinkage insulating layer. The interior of an axial inner cavity between the upper and lower fuse tube is provided with a spring. The bottom of the lower fuse tube is fixedly provided with an impact head. The bottom of the axial inner cavity of the insulating porcelain body is provided with a sealing part. The fuse can guarantee the insulating state after fusing, and prevents an improper fusing position from causing discharge. In addition, the fuse employs the fuse tubes to directly compress a spring, and employs the impact head to damage the bottom sealing part of the insulating porcelain body. Therefore, the fuse can guarantee the reliable popup of the lower fuse tube.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a fuse. Background technique [0002] Jet fuses contain the melt in an insulating tube made of solid gas-generating material. The solid gas generating material can be made of electrical anti-white cardboard or plexiglass material. When the short-circuit current passes through the melt, the melt is immediately fused to generate an arc, and the high-temperature arc causes the solid gas-producing material to rapidly decompose to generate a large amount of high-pressure gas, so that the ionized gas is ejected at both ends of the tube with an arc, emitting great sound and light, And when the AC current crosses zero, the arc is extinguished and the current is interrupted. Chinese Patent Application No. 201310538197.X discloses a fuse. The fuse tube is arranged inside the insulating porcelain body, and the upper contact electrode and the lower contact electrode corresponding t...

AI Technical Summary

Problems solved by technology

This patent has the following defects: 1. It is impossible to determine where the fuse first fuses. If the fuse occurs at the bottom end, the residual fuse on the upper part and the lead-out wire in the lower outlet are relatively close to each other, which is easy to generate arcs, resulting in Line failure; 2. The pop-up structure of this patent is unreasonable. Once the lower fuse tube is not completely popped out, the springs left in the insulating ceramic body will be used as conductors, which will easily cause incomplete breaking and cause losses.

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