Parallel connection thermosensitive temperature-sensing combined switch

Abstract

The invention discloses a temperature sensitive combination switch parallel connection with simple and rational structure, convenient use, high sensitivity and good reliability in the technical field of a temperature sensitive switch; an outer cover is provided with a cavity; some fixed terminals stretch into the cavity of the outer cover from an end of the outer cover; the other fixed terminals are arranged outside the outer cover; a bimetallic element is fixedly arranged in the cavity of the outer cover; one end of the bimetallic element is connected electrically with the fixed terminal in the cavity of the outer cover; a silver contact is arranged on a lower side face or an upper side face of another end of the bimetallic element; a silver contact piece is correspondingly arranged above or under the bimetallic element; one end of the silver contact piece is detached from the silver contact; a pin of a thermal resistor is connected electrically with another end of the silver contactpiece; another pin of the thermal resistor is connected electrically with the fixed terminal; one end of a welding terminal is connected electrically with the silver contact piece; and another end ofthe welding terminal stretches out from another end of the outer cover and is arranged outside the outer cover.

Description

technical field [0001] The invention belongs to the technical field of heat-sensitive temperature switches, in particular to a single-control normally-open parallel circuit type heat-sensitive temperature combination switch. Background technique [0002] Most of the existing non-recoverable temperature-sensing cables are in the form of twisted-pair or coaxial cables, and their outer layers are surrounded by heat-sensitive insulating materials. The two wires are in a high-resistance state under normal monitoring conditions. When the ambient temperature rises to Or when the predetermined value is exceeded, the wire short circuit is in a low-resistance state, thereby sending out a fire alarm signal. This type of detector uses switching signals, so it is basically not affected by electromagnetic interference, but there are the following problems: the principle of the non-recoverable temperature-sensing cable determines that once it alarms, it must be replaced, which increases th...

AI Technical Summary

Problems solved by technology

This type of detector uses switching signals, so it is basically not affected by electromagnetic interference, but there are the following problems: the principle of the non-recoverable temperature-sensing cable determines that once it alarms, it must be replaced, which increases the cost of use

Ambient temperature changes are transmitted to the control interface module through the temperature sensing cable. Due to the poor anti-electromagnetic interference ability of the temperature sensing cable, it is easy to cause false alarms.

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