A two-stage over-temperature and over-current protection thermal fuse

Abstract

The invention discloses a two-stage over-temperature and over-current protection thermal fuse, which comprises a first pin, a second pin, a static contact piece support, a static contact piece, a bimetal sheet, a shell, a moving contact point, an organic pressing block, a guide post, a spring, a spring prop, a bimetal sheet support and a sealing resin. The static contact piece support is arrangedinside the shell, and the static contact piece is arranged on the static contact piece support; one end of the first pin is inserted into the shell and is electrically connected with the static contact piece by spot welding. The circuit can be repeatedly switched off when the electric equipment reaches a set first-order switching-off temperature, and the fuse can cut off the electric circuit onceand for all when the electric equipment suffers from abnormal temperature rise and reaches the two-stage disconnection temperature, and the electric circuit needs to be cut off permanently, so as toeliminate the hidden danger of catching fire caused by abnormal temperature rise of the electric equipment, and has the advantages of novel work mode, reasonable structure, high performance-price ratio of the product, good safety, and strong popularization value and use value.

Description

technical field [0001] The invention belongs to the field of thermal fuses, in particular to a thermal fuse with dual-stage over-temperature and over-current protection. Background technique [0002] Organic type thermal fuse, also called organic type thermal fuse, is a one-time over-temperature protection device. It can sense the abnormal temperature rise of electronic circuits, electrical appliances and other products due to abnormal conditions, and reach its design operating temperature when the abnormal temperature is reached. Cut off the circuit in time to avoid the occurrence of fire. Common electrical equipment in daily life, such as hair dryers, rice cookers, electric heaters, electric irons, microwave ovens, coffee machines, electric motors, kettles, etc., when the internal current of the equipment is abnormal or the temperature of the machine is abnormally heated, the organic matter The type thermal fuse can automatically cut off the current to prevent damage to e...

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Problems solved by technology

[0006] The present invention aims to solve the urgent problems faced by manufacturing enterprises such as the complex production and processing technology of the dual-element protection scheme of the above-mentioned bimetallic thermostat + organic thermal fuse, high production cost, and out-of-synchronization of temperature sensing during installation and use; it provides a two-stage process Thermal fuses with over-temperature and overcurrent protection not only reduce the complex procedures of manufacturing enterprises, reduce the production costs of manufacturing enterprises, but also improve the temperature consistency of bimetallic and organic fuses, and improve the technical level of heating and electrical equipment; thus Improving the market competitiveness of heating manufacturing enterprises is conducive to the further development and growth of my country's manufacturing industry

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