Short-circuited prevention power failure resetting type snap action thermostat

Abstract

Provided is a short-circuited prevention power failure resetting type snap action thermostat. A first PTC heating unit and a second PTC heating unit of the thermostat are arranged in a first PTC bin and second PTC bin of a shell respectively and make contact with the top surface of an upper rivet head of a first rivet and the top surface of an upper rivet head of a second rivet respectively, the first rivet and the second rivet are connected to a bottom plate of the shell in a riveting mode, the first rivet penetrates through a first pressing block and a reed to be connected to a first terminal in a riveting mode, the second rivet penetrates through a second pressing block to be connected to a second terminal in a riveting mode, flaky compressed springs are arranged between the bottom surface of a guide frame and the top surface of the first PTC heating unit and between the bottom surface of the guide frame and the top surface of the second PTC heating unit, an action rod sequentially penetrates through the guide frame, the flaky compressed springs and a guide pipe in the center of the shell from top to bottom to be connected with the reed, and the top end of the action rod is located below a bimetallic disc and makes contact with the bimetallic disc. The thermostat is simple in structure, conducting elements are reliably connected, and when the thermostat works under abnormally harsh conditions, even though the PTC heating units are smashed, it is guaranteed that a short-circuit accident of the thermostat cannot occur.

Description

technical field [0001] The invention relates to the technical field of temperature controllers, in particular to a short-circuit-proof power-off reset type snap-type temperature controller. Background technique [0002] At present, some electric heating appliances will be equipped with power-off reset jump type thermostats for overheating protection of electric heating appliances. When the temperature of the electric heating appliance is too high or dry-burning occurs, the power-off reset jump thermostat will perform action protection by itself, disconnect the circuit, and only when the power is turned off can the thermostat be reset and powered on. There is an existing power-off reset jump type thermostat consisting of a cover 1, a bimetal disc 2, a guide frame 3, a stainless steel sheet 4, a housing 5, a first PTC heating element 6, a first terminal 7, and a first spring 8 , the first rivet 9, the fixed contact 10, the moving contact 11, the reed 12, the cover plate 13, t...

AI Technical Summary

Problems solved by technology

When the PTC heating element is broken due to the above factors, with the increase of the number of operating cycles, the change of thermal expansion and contraction, and if it encounters extreme conditions such as high current and high voltage impact, the PTC heating element may be shattered. Spring 8 or 16 will elongate the elastic recovery, and serious safety hazards such as short circuit will occur

[0006] In addition, since the above-mentioned power-off reset snap-type thermostat is in contact with the upper and lower electrodes of the PTC heating element through the stainless steel sheet 4 and the first and second springs 8 and 16, and the stainless steel sheet 4 is inelastic, the first and second springs 8 and 16 are installed in the holes of rivets 9 and 15 because the diameters are very small, and the contact surface with the bottom surface of the PTC heating element is very small, resulting in the stainless steel sheet 4, two springs 8, 16 and the first and second PTC heating elements 6 and 17 being up and down. The contact of the electrode is unreliable, which reduces the stability of the PTC heating element

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