Aircraft high temperature pressure air duct leak detection system

Abstract

The invention discloses an airplane high-temperature pressure air pipeline leakage detection system. The airplane high-temperature pressure air pipeline leakage detection system is characterized in that a plurality of detection units which are continuously distributed along the axial direction of a pipeline are serially connected to form an integrated structure, the pipeline runs through an air layer protection pipe, an air layer is formed between the pipeline and the air layer protection pipe, a solid heat insulation layer wraps the air layer protection pipe, and a thermosensitive detection wire is distributed below the solid heat insulation layer along the axial direction and is communicated with the air layer through a guide passage. The airplane high-temperature pressure air pipeline leakage detection system is applicable to an airplane-mounted system widely adopting a high-temperature pressure pipeline. Compared with the existing airplane high-temperature air conduit leakage monitoring device, only when the thermosensitive detection wire senses the existence of high-temperature gas and the rapid variation of a resistance value is detected, an alarm is given, so that the recognition degree is high, and the error alarming rate is low; when leakage quantity is only small, the leaked small airflow can be rapidly and directly sprayed to the thermosenstive detection wire through an air layer baffle plate and the guide passage, so that the airplane high-temperature pressure air pipeline leakage detection system has the advantages of strong recognition capacity, rapidness in response, simplicity, reliability, restoration and the like.

Description

technical field [0001] The invention relates to the on-board field of aircraft, in particular to an aircraft pipeline leakage detection system. Background technique [0002] The air management system is one of the important airborne systems of the aircraft. It is responsible for the adjustment and control of parameters such as cabin pressure, temperature, humidity, air supply volume, and air quality, cooling of electronic equipment, and protection of the engine and wings. Pressurization of ice, fuel tanks, hydraulic tanks and potable water, and air supply for engine starting, etc. It mainly includes bleed air, cockpit pressure regulation, cockpit temperature regulation, anti-icing and auxiliary power unit to meet the ground environment control requirements, and the systems are cross-linked through air ducts. As the lifeline of the aircraft, the aircraft air duct system is an important part of the aircraft air management system. However, during the normal operation of the ai...

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Problems solved by technology

[0003] At present, the high-temperature air duct leakage monitoring system in service on the aircraft has the following problems: (1) The false alarm rate is high. When the aircraft vibrates or the pipeline is displaced and deformed, the position of the detection line is easy to get close to the diversion hole and a false alarm occurs; (2) the recognition ability is poor under small leakage. The energy attenuation is fast, so the existing detection system has poor ability to capture small flow leakage. (3) The response time of the system is slow, and the pipeline leakage detection system of the air duct is an important part of the modern aircraft fire detection system. According to the regulations of the FAA (Federal Aviation Administration), the fire alarm in the cargo compartment and the overheating detection system must give an alarm to the crew members in a short period of time, but the existing detection system is arranged at a distance of 1 to 2 inches above the duct, and The energy attenuation of the leakage air flow is large during the transmission process, and the detection system will only respond after being heated by the leakage air flow for a period of time

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