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

Abstract

A linear type heat detector with a passive short-circuit isolator is provided, which comprises the temperature inductive elements, a conversion box, a terminal resistor and at least two passive short-circuit isolators which are connected in series with the temperature inductive elements. The invention of the linear type heat detector can check in the conversion box whether short circuit occurs on some sections of the temperature inductive elements and melt the passive short-circuit isolator connected in series with the temperature inductive elements close to the short dot by increasing the voltage directly or gradually. Thus the short-circuit section and the connected parts immediately behind can all be easily eliminated accurately and reliably, after which the left sections are still under normal operation to sound an alarm. In addition, the invention is characterized in that the passive short-circuit isolator is simple in structure and goes without communication device, so the reduction of production cost can be achieved. Besides, the said linear type heat detector has the advantage of easy voltage increase, which greatly improves 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] The linear temperature-sensitive fire detector commonly used at present is a fire detector with a wide range of uses. FIG. 1 is a structural schematic diagram of a linear heat-sensitive fire detector in the prior art. As shown in Figure 1, 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 monitor the alarm electrical parameters of the linear temperature sensing element 1 in real time. A conversion box 2 that detects and sends a fire alarm signal when the detected electrical parameter exceeds the set value; connects the other end of the online temperature sensing element 1, and has a terminal resistor 3 that has the function of circuit...

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

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