Major diameter upper leading-out wire two segment type insulation porcelain body injection fuse

Abstract

The invention discloses a major diameter upper leading-out wire two segment type insulation porcelain body injection fuse. A top portion of an insulation porcelain body is provided with a locking device, a fuse is fixed with a wiring column of a lower fuse tube, penetrates through an upper fuse tube and is fixed at an upper end of the insulation porcelain body through the locking device, a portion of the fuse in a middle fuse tube is provided with a fusing portion with a relatively small diameter, two ends of the fusing portion are provided with fireproof caps, the portion of the fuse between the fireproof caps, the upper fuse tube and the lower fuse tube is externally sleeved in a pyrocondensation insulation layer, an axial chamber between the upper fuse tube and the lower fuse tube is internally provided with a spring, a bottom portion of the lower fuse tube is fixed with an impact head, and a bottom portion of the axial chamber of the insulation porcelain body is provided with a plug. According to the major diameter upper leading-out wire two segment type insulation porcelain body injection fuse, the fuse after fusing is guaranteed to be in an insulation state, a discharging phenomenon caused by improper fusing position can be avoided, moreover, the fuse tubes are utilized to directly compress the spring, the impact head is further utilized to destroy seal blocking of a bottom portion of the insulation porcelain body, and thereby the lower fuse tube is guaranteed to realize reliable popup.

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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