Dual-gas route type heat-sensitive fire detector and detection method thereof

Abstract

The invention relates to a double-gas-line type temperature sensing fire detector and a detection method of the double-gas-line type temperature sensing fire detector. The double-gas-line type temperature sensing fire detector comprises a box body and multiple detection pipelines outside the box body. The detection pipelines comprise detection outer pipes and detection inner pipes located in the detection outer pipes. First detection gases are filled into the detection outer pipes. Second detection gases are filled into the detection inner pipes. Expansion coefficients of the first detection gases and the second detection gases are different. The detection pipelines are provided with first ends and second ends which correspond to the first ends. Pressure sensors used for measuring values of outer pipe gas pressure in the detection outer pipes and values of inner pipe gas pressure in the detection inner pipes are arranged in the box body. The output ends of the pressure sensors are connected with a central processor. The output end of the central processor is electrically connected with an alarm outputting circuit. The double-gas-line type temperature sensing fire detector and the detection method of the double-gas-line type temperature sensing fire detector are simple in structure, high in detection precision, high in automation degree, wide in application range, safe and reliable.

Description

technical field [0001] The present invention relates to a fire detector and its detection method, in particular to a dual-gas route type heat-sensitive fire detector and its detection method, in particular to a fire detector which can be used for early detection of fire and electric power, metallurgy, petrochemical Fire detectors and detection methods for various long tunnels, large production workshops, warehouses, rail transit and other environmental places in industrial fields, etc., belong to the technical field of fire detection and alarm. Background technique [0002] In the existing technology, the first generation of air-pipe type linear differential temperature fire detector is characterized by a single-pipeline and single-detection airway, which collects the switch value temperature signal to give an alarm, and the detection of leakage and blockage of the pipeline relies on manual inspection on a regular basis. It is realized by pressurizing the pipeline; the chara...

AI Technical Summary

Problems solved by technology

The first generation of air tube type linear differential temperature fire detector has two major shortcomings: first, the air leakage or blockage of the detection tube cannot be automatically detected, and it is necessary to manually detect the tube by using a simple manual gas injection method according to the specified time. Whether there is blockage or air leakage in the pipeline, if the detection tube leaks during the detection cycle interval, and a fire occurs at this time, the alarm cannot be

First of all, the detection pipeline is a single pipeline, and the detection length is up to 100m, so one detector can only protect 100×5=500m 2 area (the space protection area of ​​the detector is calculated according to the rectangular area, area = length × width, and the protection width is ±2.5m space around the detection tube). Very high, and the amount of construction is also very large

Second, although the detector has certain data analysis capabilities, because the detection pipeline is linear, its influence by the ambient temperature is not only related to the ambient temperature, but also to the length of the detection pipeline. The use of the detection pipeline The length is related to the installation position of the project, and the length is not unique, so the detector cannot realize the tracking compensation of the ambient temperature in the true sense. When it is used in an industrial place where the ambient temperature changes frequently, the detector will still cause false alarms.

Thirdly, the detector’s self-inspection device uses a motor to drive the cam to make a certain stroke to push the air chamber to inflate the self-inspection. However, in practical applications, it is often found that it is difficult for the cams to completely match each time during the occlusal process. It will make the air chamber unable to exhaust all the gas in the air chamber during the self-inspection, so that the end leakage fault of the detection pipeline will not be detected during the self-inspection

Fourth, the detection tube is filled with ordinary air, its detection sensitivity is not high enough, and it is a non-explosion-proof product, so its application range is limited

Images