Linetype temperature-sensing fire disaster detector with passive short circuit isolator

Abstract

A wire-type heat-sensitive fire detector with a passive short-circuit isolator. It includes a linear temperature sensing element, a conversion box, a terminal resistor and at least two passive short-circuit isolators connected in series to the linear temperature sensing element. The linear temperature-sensing fire detector with a passive short-circuit isolator of the present invention can directly increase the voltage or gradually increase the voltage when the conversion box detects a short circuit in a certain section of the linear temperature sensing element. Fuse the passive short-circuit isolator close to the short-circuit point on the linear temperature sensing element connected in series, so that the short-circuit section and the section behind it can be accurately and reliably removed, or only the short-circuit section can be removed, while the rest of the section can still be The alarm is carried out normally, so the process of eliminating the short-circuit section is relatively simple. In addition, since the passive short-circuit isolator has a simple structure and does not require communication, the production cost can be reduced, and the fire detector also has the advantages of convenient pressurization, which can greatly improve the reliability of the detector.

Description

technical field [0001] The invention relates to a linear temperature-sensitive fire detector, in particular to a linear temperature-sensitive fire detector with a passive short-circuit isolator. Background technique [0002] At present, the commonly used linear heat-sensitive fire detector is a widely used fire extinguishing detector. figure 1 It is a structural schematic diagram of a linear temperature-sensitive fire detector in the prior art. Such as figure 1 As shown, this prior art linear temperature sensing fire detector includes a linear temperature sensing element 1; one end connected to the linear temperature sensing element 1 can detect the alarm electrical parameters of the linear temperature sensing element 1 in real time, And when the detected electrical parameter exceeds the set value, a switch box 2 that sends out a fire alarm signal; connected to the other end of the online temperature sensing element 1, a terminal resistor 3 with a circuit breaker monitorin...

AI Technical Summary

Problems solved by technology

But, there is following problem in this prior art linear heat-sensing fire detector: 1, it is more complicated to the rejecting process of short-circuit section: promptly once short-circuit occurs between detection conductor 4,5 on the linear temperature sensing element 1 fault, the conversion box 2 first needs to judge the short-circuit section on the linear temperature sensing element 1, and then control the corresponding short-circuit isolator to disconnect through the wireless or wired data line, so as to eliminate the section where the short-circuit fault occurs. In this way, when When a fire breaks out again, the remaining sections connected with the conversion box 2 can normally carry out fire alarm

2. The short-circuit isolators 7a and 7b not only need to have the isolation function, but also must be able to have the functions of address coding, monitoring and communication, so the implementation is relatively complicated and the cost is high, which will greatly affect the reliability of the fire detector

Images