A small overcurrent thermal protector

Abstract

The present application discloses a small overcurrent thermal protector, comprising a casing (1) with an opening at one end and a bottom plate encapsulated on the opening of the casing (1). The casing (1) is provided with an inner insulating layer (3), and the inner insulating layer (3) It is attached to the inner wall of the casing (1) and is arranged in coordination with the shape of the casing (1); the inner insulating layer (3) is provided with a bimetallic sheet (4), one end of the bimetallic sheet (4) It is fixedly arranged on the side wall of the inner insulating layer (3), and the other end of the bimetallic sheet (4) is provided with a movable contact one (5); the inner insulating layer (3) is provided with a sliding metal sheet (6) , the sliding metal sheet (6) is relatively slidingly arranged with the inner insulating layer (3). The advantage of the present invention is that the sliding drive device is driven by the temperature sensing component, so that the two contacts inside the overcurrent thermal protector can be effectively disengaged when slight adhesion occurs, thereby ensuring reliable operation of the overcurrent thermal protector.

Description

technical field [0001] The invention relates to a small overcurrent thermal protector, which belongs to the field of electronic equipment. Background technique [0002] The overcurrent thermal protector is a combination of two different alloys, which will generate heat after passing the current. Due to the different thermal expansion coefficients of the two different alloys, the alloy is bound to bend in one direction, and the contact will be separated, and the power will be cut off. The bending speed is proportional to the magnitude of the current passing through it. This protects the electrical equipment. The two internal contacts of the existing overcurrent thermal protector can only separate the two internal contacts through the expansion and bending of the bimetal after heating in the case of overcurrent. When there are many overcurrent situations, the two internal contacts may be slightly adhered, and the connection force between the two internal contacts increases. ...

AI Technical Summary

Problems solved by technology

The two internal contacts of the existing overcurrent and overheating protector, in the case of overcurrent, can only realize the separation of the two internal contacts through the expansion and bending of the bimetal after being heated. When the overcurrent and overheating protector When there are many cases of overcurrent, the two internal contacts may be slightly adhered, and the connection force between the two internal contacts increases, and the expansion and bending of the bimetal sheet after heating may not make the two internal contacts The contact is out of contact, so that the overcurrent protection cannot be realized, which affects the use of the overcurrent and overheating protector

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