Hot-film gas extinguishing chemical concentration sensing module

A gas fire extinguishing agent and concentration sensing technology, applied in the field of aircraft fire prevention, can solve the problems of inconvenient operation, easy blockage of porous restrictor plugs, lack of computer data processing means, etc., to improve test accuracy, reduce response lag, improve The effect of precision

Inactive Publication Date: 2012-06-27
UNIV OF SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

[0003] ① Although the device is relatively simple, it is inconvenient to operate;
[0004] ②The porous restrictor plug is easy to block;
[0005] ③ Use an oscilloscope to read and calculate to obtain the fire extinguishing agent concentration data, lacking computer data processing means

Method used

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  • Hot-film gas extinguishing chemical concentration sensing module
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  • Hot-film gas extinguishing chemical concentration sensing module

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Embodiment Construction

[0024] The present invention will be described below in conjunction with the accompanying drawings and specific embodiments.

[0025] The hot-film type gas fire extinguishing agent concentration sensing module of this embodiment has a structure such as figure 1 As shown, the gas fire extinguishing agent concentration information sensing component is placed above the main pipeline 2, and the mixed gas of air and gas fire extinguishing agent after corresponding treatment enters the main pipeline 2 of the module at a constant temperature and flow rate, An orifice 3 is added to the path 2, so that a certain pressure difference is formed before and after the orifice 3, so that a small amount of mixed gas to be measured enters the bypass line 5, and two temperature-sensitive films 6, 7 are placed in the bypass line 5 and a heating film 8, the heating film 8 heats the mixed gas to be measured flowing through the bypass pipeline 5, and the temperature-sensitive films 6 and 7 detect th...

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Abstract

The invention discloses a hot-film gas extinguishing chemical concentration sensing module. By the adoption of a diffluence test method, microscale airflow passes through a bypass pipeline, inside which a temperature-sensitive film and a heating film are arranged; the microscale air and a gaseous mixture of the gas extinguishing chemical are heated by the heating film; as the gaseous mixture passes through the temperature-sensitive film, the temperature of the temperature-sensitive film changes and then the resistance value of the temperature-sensitive film changes; voltage value generated from the circuit is outputted, and through signal treatment, a digital signal and an analog signal are outputted. By controlling the flow of gases flowing through the temperature-sensitive film, the temperature change of the temperature-sensitive film is determined by the concentration of the gaseous mixture, and the electric signal generated is processed and outputted so as to obtain the concentration value of the gas extinguishing chemical. The invention can be widely applied in a gas extinguishing chemical concentration test system so as to establish a rapid high-precision gas extinguishing chemical concentration test system.

Description

technical field [0001] The invention belongs to the technical field of aircraft fire protection, in particular to a hot-film gas fire extinguishing agent concentration sensing module. Background technique [0002] In the field of aircraft fire prevention, the test requirements for the concentration of fire extinguishing agent are very high. At present, the traditional differential pressure measurement method in the 1970s is still used in foreign countries, while our country is still blank in terms of testing equipment and methods for the concentration of aircraft gas fire extinguishing agent. In the traditional differential pressure measurement method, the measurement principle is mainly based on the fact that when a certain amount of mixed gas with different concentrations flows through the porous restrictor plug, different pressure drops will be generated due to different gas viscosities. The differential pressure sensor is used to measure the differential pressure. And us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
Inventor 赵建华陈迎春
Owner UNIV OF SCI & TECH OF CHINA
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