Fuse with thermal shrinkage insulation layer sleeving fuse tube

Abstract

The invention discloses a fuse with a thermal shrinkage insulation layer sleeving a fuse tube. A locking device is arranged at a top of an insulation porcelain body, a fuse wire is fixed with a binding post of a lower fuse tube, passes through an upper fuse tube and is fixed at an upper end of the insulation porcelain body by the locking device, the fuse wire is partially provided with a melting part having relatively small diameter at the middle of the fuse tube, fireproof caps are arranged at two ends of the melting part, thermal shrinkage insulation layers sleeves the fireproof caps and the fuse between the upper fuse tube and the lower fuse tube, a spring is arranged in an axial inner cavity between the upper fuse tube and the lower fuse tube, an impact head is fixedly arranged at the bottom of the lower fuse tube, and a plug is arranged at the bottom of the axial inner cavity of the insulation porcelain body. By the fuse with the thermal shrinkage insulation layer sleeving the fuse tube, the fuse after being melted can be enabled to be in an insulation state, and a discharge phenomenon caused by poor melting position is prevented; and moreover, the fuse tubes are used for directly compressing the spring, the sealing plug at the bottom of the insulation porcelain body is damaged by the impact head, and thus, the lower fuse tube can be enabled to reliably popped out.

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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