An Aspirating Aircraft Cargo Fire Detector Using Smoke and Gas Sensing

Abstract

The invention provides an air suction type airplane cargo fire disaster detector with the smog gas sensing function. The air suction type airplane cargo fire disaster detector comprises a sampling port, a sampling pipe, a smog detecting unit, a gas detecting unit, a sucking pump, an exhaust pipe, a control processing unit, an alarm indicating unit and a power unit. The outer side of the sampling port is provided with a protection cover, and the sampling port is internally provided with a filtering assembly and a drying assembly in sequence. The back of the sampling port is connected with the smog detecting unit, the gas detecting unit, the sucking pump and the exhaust pipe through the sampling pipe in sequence, the laser smog induction sensing is adopted in the smog detecting unit, and the angle between a light source and a photosensitive element ranges from 155 degrees to 165 degrees. The gas detecting unit is formed by connecting a carbon monoxide sensor and a carbon dioxide sensor in parallel. The control processing unit is used for analyzing the work states and data of the smog detecting unit and the gas detecting unit, judging the fire disaster according to the stored detection algorithm, controlling the work frequency of the sucking pump and controlling the work state of the alarm indicating unit. The air suction type airplane cargo fire disaster detector can fast detect the early stage fire disaster and remove the factors affecting the detecting performance from the environment.

Description

technical field [0001] The invention belongs to the technical field of fire detection, and in particular relates to an air-breathing aircraft cargo compartment fire detector adopting smoke and gas sensing, which can also be used for detecting special environments such as aircraft cargo compartments. Background technique [0002] At present, the fire detectors used in aircraft cargo compartments are mainly point smoke detectors. This kind of detector is easily affected by dust and humidity in the air and may cause false alarms. According to the statistics of David Blake et al. of the FAA Technical Center, the false alarm rate of the fire detectors in the cargo compartment of the aircraft currently in use is as high as 99% [David Blake. http: / / www.fire.tc.faa.gov / pdf / tn00-29.pdf, 2000-06-01]. This kind of detector adopts passive detection fire detection technology, which can only be detected when the fire smoke spreads to the detector. There are a lot of goods in the cargo ...

AI Technical Summary

Problems solved by technology

The change of smoke temperature in the early stage of fire is very insignificant, which is not the best fire parameter for early fire detection

And the filter device at the front end of the sampling port is not particularly selective to particles, some interfering particles similar to smoke particles will enter the sampling tube, which will affect the smoke detection

A heating device is added behind the sampling port, the purpose is to ensure that the temperature of the rear airflow is basically maintained at 20°C, and to reduce the influence of condensation of the airflow on the detection. Ensure that the temperature of the airflow behind is maintained at a good level

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