Two-segment type insulating porcelain body injecting fuse

Abstract

The invention discloses a two-segment type insulating porcelain body injecting fuse. The top of an insulating porcelain body is provided with a locking device. A fuse is fixed with a terminal of a lower fuse tube and passes through an upper fuse tube and is fixed on the upper end of the insulating porcelain body by the locking device. The part of the fuse at a middle fuse tube has a fusing part with a small diameter. Both ends of the fusing part are provided with anti-fire caps. The anti-fire caps and the exterior of the fuse between the upper fuse tube and the lower fuse tube are covered by a thermal shrinkage insulating layer. Springs are arranged in axial inner chambers of the upper fuse tube and the lower fuse tube. An impact head is fixed at the bottom of the lower fuse tube. A plugging is arranged at the bottom of the axial inner chamber of the insulating porcelain body. The two-segment type insulating porcelain body injecting fuse ensures that the fused fuse shows the insulation state, and avoids a discharge phenomenon caused by a bad fusing position. Moreover the two-segment type insulating porcelain body injecting fuse uses the fuse tubes to directly compress the springs, and employs the impact head to destroy the plugging at the bottom of the insulating porcelain body. Thus the reliable popping of the lower fuse tube can be ensured.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a fuse. Background technique [0002] Spray type fuse is to install the melt in the insulating tube made of solid gas-generating material. Solid gas-generating materials can be made of electrical anti-white cardboard or plexiglass materials. When the short-circuit current passes through the melt, the melt will be fused immediately to generate an arc, and the high-temperature arc will quickly decompose the solid gas-producing material to generate a large amount of high-pressure gas, so that the ionized gas will be ejected at both ends of the tube with an arc, and a great sound and light will be emitted. And when the AC current crosses zero, the arc is extinguished and the current is broken. Chinese patent application number 201310538197.X discloses a fuse, the fuse tube is arranged inside the insulating ceramic body, and the upper contact electrode and the lower contact ...

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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