Cable-type detector

Abstract

Provided is a cable-type detector. The cable-type detector is characterized in that according to the structure of a temperature sensing cable, a meltable NTC characteristic material layer is axially arranged outside a first elastic metal conductor serving as a cable core, the meltable NTC characteristic material layer is wound with a second elastic metal conductor, and then the formed structure is coated with an extrusion molding outer sheath layer; the two ends of the first elastic metal conductor and the two ends of the second elastic metal conductor are connected with a signal processing device and a terminal resistor R respectively, and a closed-circuit signal collection circuit is formed. The other structure is characterized in that after the first elastic metal conductor is coated with the meltable NTC characteristic material layer, the meltable NTC characteristic material layer is wound with the second conductor and wound with a metal conducting layer simultaneously, and then the formed structure is coated with the outer sheath layer through extrusion molding. The signal processing device detects changes of resistance between the two conductors in real time; if the resistance decreases and a short circuit occurs, a constant temperature alarm signal is sent out; if the resistance does not decrease, but the short circuit occurs, a short-circuit fault alarm signal is output. The structure is simple, the cost is low, the sensitivity of temperature sensing detection is high, the function of distinguishing a short-circuit fault, not caused by fire, of the detection conductors can be achieved, and the electrical signal processing device can output alarm signals with multiple states.

Description

technical field [0001] The invention relates to a fire alarm device, which is a cable-type detector, which is a linear temperature-sensitive fire detector with the function of distinguishing non-fire factors to detect conductor short circuits and reporting faults. technical background [0002] 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 switching value wire temperature detector 101 is twisted together by two conductors, and each conductor is covered with a...

AI Technical Summary

Problems solved by technology

[0003] 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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