Thermosensitive switch

Abstract

PURPOSE: To provide a small-sized and thin-type thermally-actuated switch which allows relaxing effect of external stress upon a fixing part of each terminal to a bimetal piece or fixed contact even when external force is applied to the terminal led out of a case so as to reduce effect of displacement of the bimetal piece or fixed contact, and having a stable temperature characteristic. CONSTITUTION: This thermally-actuated switch has an insulation case 1; a first terminal 2 installed in the insulation case 1, fixedly attached with a fixed contact 3 on one side and led out of the insulation case 1 on the other side; a bimetal piece 5 fixedly attached with a moving contact 6 on one side, inverting according to a temperature to contact with and separate from the fixed contact 3; and a second terminal 4 installed in the insulation case 1, fixedly attached with the other side of the bimetal piece 5 on one side and led out of the insulation case 1 on the other side. Opening parts 2c, 4c are formed between the fixing part of the first terminal 2 to the fixed contact 3 and the other end side led out of the insulation case 1, and / or between the fixing part of the second terminal 4 to the bimetal piece 5 and the other end side led out of the insulation case 1.

Description

technical field [0001] The invention relates to a thermal induction switch, in particular to a switch structure capable of reversing a movable contact point through the thermal induction effect of a bimetal sheet, and further opening and closing an electrical contact point. Background technique [0002] The heat-sensitive switch has a heat-sensitive element (bimetallic sheet) formed by laminating several metal parts with different thermal expansion coefficients as a movable electrode of the movable piece, and together with the movable electrode forms a contact point. The fixed pole of the circuit in closed form, so that the electrical equipment can be protected by connecting this heat-sensitive type switch in the electrical equipment circuit. [0003] That is to say, when the thermal induction switch connected in the electrical equipment circuit has an excessive current flowing through the electrical equipment and the ambient temperature is too high, the contact point of the...

AI Technical Summary

Problems solved by technology

[0010] In the heat-sensitive switch structure in the prior art as described above, the connecting terminal portions 18 and 19, which are the other ends of the movable side terminal 15 and the fixed side terminal 12, are formed from the bimetal The fixed installation part on the piece 14 and the above-mentioned movable side terminal 15, or the fixed installation part on the above-mentioned fixed contact point 11 is directly led to the structure outside the above-mentioned housing 17, so for the above-mentioned connecting terminal part during installation When an external force is applied to 18 and 19, the above-mentioned connecting terminal parts 18 and 19 will be bent along the plate thickness direction, and the front end part of the above-mentioned movable contact point 13 fixedly installed on the above-mentioned bimetal 14 will be bent. position, and the position on the above-mentioned fixed contact point 11 is deformed, so there is a problem that it will adversely affect the temperature characteristics of the above-mentioned bimetallic strip 14

[0011] In addition, in the embedded portion of the movable side terminal 15, in order to suppress the influence of terminal bending, a multi-stage bent portion 15a is formed inside the above-mentioned housing 17, so there is a further increase in thickness due to this bent portion 15a. increase, making it difficult to miniaturize and reduce the thickness of the switch

Images