Non-selective fire gas detection device based on viscosity properties

Abstract

The invention discloses a non-selective fire gas detection device based on viscosity properties. The device comprises a sampling unit, a flow velocity control unit, a constant temperature control unit, a detection and identification unit and a data recording and analysis unit, wherein the sampling unit is used for extracting a gas sample generated due to leakage or combustion in the environment tobe detected by means of a vacuum pump, and the extracted gas sample sequentially enters the flow velocity control unit and the constant temperature control unit through a sampling pipe after passingthrough a sampling end filter screen and a drying agent; the flow velocity control unit consists of a flow-limiting valve and a flow meter, and can realize the accurate adjustment of the flow velocityof gas flowing through the flow velocity control unit so as to enable the flow velocity of the gas to be detected to meet the detection requirement; the constant temperature control unit comprises atemperature adjustment part and an electric heating coil, and can be used for rapidly heating the gas, flowing through the temperature adjustment part, up to set temperature; the detection and identification unit comprises a cylindrical porous media and a sleeve; two micro pressure differential sensors are respectively arranged at the two ends of the detection and identification unit and are usedfor acquiring and analyzing the pressure loss of the gas after the gas flows through the porous media; the data recording and analysis unit can be used for collecting and recording the signal responseof the micro pressure differential sensors, and further identifies the type of the gas by comparing the obtained differential pressure with characteristic differential pressure of a standard gas sample.

Description

technical field [0001] The invention belongs to the technical field of fire fighting, and in particular relates to a viscosity-based non-selective fire gas detection device, which is suitable for detection and recognition of fire gas in the leakage of combustibles or the initial stage of combustion. Background technique [0002] As an effective fire detection technology, fire gas detection can detect and identify potential fire and explosion risks in the early stage of leakage or combustion of combustibles (gas, steam, etc.), so as to effectively prevent the consequences of serious accidents and disasters. Traditional fire detection technology is generally based on the smoke generated during the combustion process, temperature changes, and flame morphology characteristics. Generally, the alarm can only be issued when smoke particles and heat in the air accumulate to a certain extent. As a chemical reaction, combustion will change the composition of the surrounding environmen...

AI Technical Summary

Problems solved by technology

In addition, for some gases with similar chemical properties, it is difficult to accurately identify the type of leaking gas because it will cause the same sensor to alarm

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