Fire early warning device for aircraft engine

Abstract

The invention provides a fire early warning device for an aircraft engine. A redundancy voltage comparing and detecting technology, an outputting closed loop detecting technology and a crosslinking communication monitoring technology are used for detecting fire of the aircraft engine. The fire early warning device for the aircraft engine comprises an electrical bridge circuit, a logic control unit, a signal outputting circuit, a crosslinking outputting line and a crosslinking inputting line, wherein the electrical bridge circuit is provided with a thermal inductance resistance sensor; variations of resistance values of the thermal inductance resistance sensor are compared and judged by the logic control unit; fire warning and line faults can be detected in time; an outputting port is subjected to read-in comparison when equipment is electrified and runs; the outputting state is detected in real time so as to find out faults of a detecting box in time; and a crosslinking monitoring circuit monitors states of adjacent fire early warning devices in real time and transmits a device fault signal when the adjacent fire early warning devices fail.

Description

technical field [0001] The invention relates to the technical field of fire detection and early warning, and more specifically relates to a fire early warning device for an aircraft engine. Background technique [0002] During the working process of the aircraft engine, a fire may occur due to severe wear of the parts, fuel leakage, electrical short circuit, etc. If it is not controlled, not only controlled, it will not only seriously damage the engine, but also directly endanger flight safety. Therefore, modern aircrafts are equipped with engine fire detection systems, which can send out fire alarm signals in time and accurately so that the fire protection system can put out the fire of the engine when the engine is on fire. Such as figure 1 As shown, the aircraft engine fire warning system in the prior art is mainly composed of three parts: a fire detector, a logic circuit for processing fire detection signals and an alarm system. [0003] Fire detectors are used to dete...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned engine fire alarm prediction system uses a pneumatic detector to realize the self-inspection of the fire detector. The difference in flight altitude and temperature is very large, and the pneumatic detector itself has a considerable possibility of false alarms and false failures

When multiple fire detectors fail at the same time, the system itself cannot determine whether it is caused by a fire or a failure of the detector or the power supply itself.

In addition, the alarm signal sent to the alarm system does not have a self-check function. When the transmission line of the alarm system fails and the alarm signal cannot be transmitted in time, the system cannot generate an alarm.

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