A Composite Fire Detector Used in the Special Environment of Aircraft Cargo Hold

Abstract

The invention provides a composite fire detector applied to an airplane cargo space special environment. The composite fire detector comprises a sensor module, a central control module, a power module, a CAN bus transmission module and a sound-light alarm module. The sensor module is formed by connecting in parallel a smoke sensor, a heat sensitive sensor, a carbon monoxide sensor, a pressure sensor and a humidity sensor. The central control module reads data of smoke, temperature, carbon monoxide concentration, pressure and humidity in the sensors in real time, automatically adjusts alarm threshold values are according to the pressure and humidity, and identifies interference sources and real fires in the environment. The sound-light alarm module is controlled by the central control module to send out an alarm indication or not. Under the condition that the network is connected, the CAN bus transmission module sends output signals of the central control module to a control platform. The composite fire detector can collect and analyze fire feature parameters and environment parameters so as to avoid the phenomenon that the composite fire detector mistakenly gives out an alarm due to changes of regional environment parameters, and can quickly detect the fires in the early stage.

Description

technical field [0001] The invention belongs to the technical field of fire detection, and in particular relates to a composite fire detector used in a special environment of an aircraft cargo hold. The composite fire detector can also be used for detection of special environments such as an aircraft cargo hold. Background technique [0002] Aircraft cargo compartments are divided into two types: airtight cabins (not directly connected to the outside atmosphere, which can adjust pressure and temperature) and non-airtight cabins (directly connected to the outside atmosphere). Since the airtight cabin can transport fresh and living items, the cargo compartment of modern aircraft generally uses an airtight cabin. In order for the aircraft structure to withstand the pressure difference between the inside and outside of the cabin, the pressure in the airtight cargo compartment also changes with the altitude of the flight. The cargo compartment pressure starts from the take-off a...

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Problems solved by technology

However, the detector also does not consider the impact of ambient pressure on the performance of the detector

According to the detection algorithm described in the patent, when the humidity increases, the probability of being identified as a water vapor interference source increases, and the smoke alarm threshold increases. If the pressure is low at this time, when a fire occurs, the smoke alarm signal will be lower than that under normal pressure, and it will be lead to slow response, or even false positives

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