Fuse type load disconnection switch

Abstract

The invention relates to a fuse type load disconnection switch. A spring energy storage operating mechanism is composed of a handle, a support, a main shaft, a shaft sleeve, a spring leaf in the shaft sleeve, a fastener, stop blocks, a pull bar and the like. A switch body is composed of an insulating base plate, a support member, an arc extinguishing shield, main contacts, steel spring rings (or sheet spring steel), a crossbeam, a blade assembly, flash barriers, a guide rail and the like. The handle is pushed or pulled to drive the main shaft, the main shaft drives the spring leaf in the shaft sleeve, energy storage of the spring in the shaft sleeve is completed when the main shaft rotates to a certain position, under the elastic force of the spring leaf, the shaft sleeve rapidly rotates to drive a link rod welded to the shaft sleeve, the link rod drives the pull bar fixed to the crossbeam of the switch, and the pull bar drives the crossbeam and the blade assembly fixed to the crossbeam to slide rapidly up and down in the guide rail to realize rapid closing and opening of the switch.

Description

technical field [0001] The present invention relates to an isolating switch, more specifically, to a fuse type load isolating switch. Background technique [0002] A fuse is an electrical appliance that uses an overload or short-circuit current to fuse the fuse, and then relies on an arc-extinguishing medium to extinguish the arc to disconnect the circuit. [0003] Fuses take on the important task of protecting electrical equipment and power grids, and limit inevitable accidents and ensure the safety of users in using electricity. [0004] According to the different characteristics of the protected objects, fuses are divided into two types: fast-acting fuses and ordinary fuses. Fast fuses are used for the protection of electronic or power electronic devices (products), while ordinary fuses are used for other non-electronic or power electronic devices. [0005] A fuse is generally composed of a melting tube, a melt, an arc-extinguishing filler, an indicator, a static contac...

AI Technical Summary

Problems solved by technology

[0035] The existing fuse-type load isolating switch has a wide range of applications, but the existing products have the following defects: the switch blade or contact is not equipped with anti-welding copper-graphite or copper-tungsten alloy arc-extinguishing contacts, when the switch is loaded When the switch is opened, the contact surface of the main knife and the main contact is easily burned by the arc, and there is no obvious breaking point when the switch is opened; the switch does not have a quick-action operating mechanism, and the opening and closing speed is relatively slow, which directly affects the arc extinguishing performance and use of the switch life

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