Novel automatic-recovery circuit safety device based on styrene maleic anhydride (SMA) thermal elastic material and working process of device

Abstract

The invention discloses a novel automatic-recovery circuit safety device based on a maleic anhydride (SMA) thermal elastic material and a working process of the device. The device comprises a current supply circuit, an alarm circuit and an automatic-recovery circuit safety switch, wherein the safety switch comprises a Ti54Ni34Cu12 shaped memory alloy wire, a fastening screw, a sliding sheet, a pre-loading spring, a current supply circuit conversion contact, an alarm circuit conversion contact, an insulation guide rail, a metal fixing clip, a primary wire and a contact conversion guide rail. By means of phase state conversion of the Ti54Ni34Cu12 with TW-SME between a low-temperature state and a high-temperature state, the timely switching between the current supply circuit and the alarm circuit is achieved. The novel automatically-recovered circuit safety device has the advantages of automatic-recovery overcurrent protection, short response time and instantaneous warning, and is convenient to install, the circuit still can be protected after the safety switch is failure, and the requirement on a working environment is relatively low; and the novel automatically-recovered circuit safety device is suitably used for various large-, medium- and small-sized industrial/civil building systems.

Description

technical field [0001] The invention belongs to the technical field of circuit safety, and in particular relates to a novel self-resetting circuit safety device based on SMA thermoelastic materials and a working process. Background technique [0002] In recent years, more and more new circuit design concepts have been widely used in industrial and civil building systems. The purpose is to improve the convenience, reliability and safety of people's lives. The primary task is to improve the safety of circuit use. . The general method is to add a fuse in the circuit. When the circuit is abnormal or faulty, it can play the role of overcurrent protection and avoid the burning of electrical appliances and the occurrence of fire. The traditional fuse making materials have transitioned from the initial lead-antimony alloy to lead, zinc, aluminum and other low-melting-point metals made of fuses of different diameters according to the allowable current intensity. The fuse made of th...

AI Technical Summary

Problems solved by technology

The self-resetting fuse made of this polymer PTC polymer can not only play the role of overcurrent protection, but also can automatically reset, which solves some shortcomings of traditional fuses. It takes a certain amount of time for the separation of the device, which makes the response time of the overall device slower and cannot achieve the effect of fast closure, and the system lacks the necessary alarm device so that the circuit fault cannot be reflected, which hinders the timely recovery of the circuit

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