A Composite Cable Temperature Sensing Fire Detector

Abstract

A composite cable type heat fire detector is characterized in that a structure of a temperature sensing cable is as follows: two coating layers made of different materials axially coexist outside a first elastic metal conductor as a cable core, wound with a second elastic metal conductor and then wrapped with an outer extrusion molding sheath layer, and two ends of each of the first elastic metal conductor and the second elastic metal conductor are connected with an electrical signal processing device and a terminal resistor R respectively to form a closed signal acquisition circuit; the electrical signal processing device detects resistance value change between the two elastic metal conductors in real time; if the resistance value is reduced and short circuit happens to the two conductors, short circuit happens after a temperature sensing cable is heated, and the electrical signal processing device sends a constant temperature alarming signal after judgment; when the resistance value between the two elastic metal conductors is not changed and short circuit happens, the electrical signal processing device judges that short circuit doesn't happen to the temperature sensing cable due to heating, and a short circuit fault alarming signal is output. The temperature sensing alarming temperature of a product can be set in a range from 60 DEG C to 180 DEG C, the performance reliability is high, the cost is low, and the sensitivity is high.

Description

technical field [0001] The invention relates to a fire alarm device, which is a switch quantity linear temperature-sensing fire detector, and a linear temperature-sensing fire detector with the function of short-circuit fault reporting. [0002] technical background [0003] A dual-temperature early-warning linear temperature-sensitive fire detector in the prior art, application number 200420120519.5, see figure 1 : The detector includes a switch value linear temperature detector 101 and an analog linear temperature detector 102, the two temperature detectors are arranged in a plastic jacket 10, the input of the resistance signal measuring device 11 The terminals are respectively electrically connected to the conductors of the switching value linear temperature detector and the analog linear temperature detector. In the embodiment, the switch value wire type temperature-sensitive detector is twisted together by two conductors, and the outside of each conductor is covered wit...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned dual-temperature early warning line-type temperature-sensitive fire detector is composed of a switch value line-type temperature-sensitive detector and an analog-value line-type temperature-sensitive detector, and the two temperature-sensitive detectors are arranged in a plastic jacket. The cost of the product is high, the outer diameter of the temperature detector is large, and the sensitivity of the temperature detection is low

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