Restorable air conduit pipeline leakage detecting device and method

Abstract

The invention provides a restorable air conduit pipeline leakage detecting device and method, which belong to the field of high-temperature and high-pressure gas leakage detection. The device is orderly composed of a plurality of detection units (5), wherein each detection unit (5) corresponds to a leakage monitoring region and is composed of a central lead (1), a metal housing (2) and a thermal sensitive medium closely filled in the metal housing (2) along the central lead (1); when the temperature of one monitoring region is higher than a prewarning value, the corresponding thermal sensitive medium is melted and communicated with the corresponding central lead (1) and the corresponding metal housing (2); when the temperature of one monitoring region is lower than the prewarning value, the corresponding thermal sensitive medium is cured again and insulated; and different thermal sensitive mediums are different in on resistance. The resistance between the central leads (1) and the metal housings (2) are monitored so as to determine whether leakage of an air conduit (7) exists and also to determine the area of leakage. The device provided by the invention is quick to respond, simple, reliable, high in identification and accurate in positioning; and the thermal sensitive mediums are restorable.

Description

technical field [0001] The invention relates to a recoverable air duct leakage detection device and method, belonging to the field of high-temperature gas leakage detection. Background technique [0002] The air management system is one of the important subsystems of the environmental control system. Its role is to complete the regulation of parameters such as pressure, temperature, humidity, air supply volume, and air quality in the controlled space and the cooling of electronic equipment. The air duct is an important part of the air management system. It is the bridge and link between the air source and the air system. It is interspersed in multiple areas such as the engine nacelle, suspension, wing, fuselage, and wing-body fairing. At the same time, due to the high-temperature and high-pressure gas flowing in the air duct, there are many coupling factors of thermal stress and mechanical stress. Once the stress concentration causes pipeline deformation and fatigue rupture,...

AI Technical Summary

Problems solved by technology

The monitoring circuit of this method is very complex, and there are monitoring blind spots, which are prone to false alarms, and do not meet the simple and reliable requirements; Judging whether there is a leak

This method is suitable for the monitoring of large leakage, and there is a monitoring blind area. In addition, when the leakage is small, signal hysteresis will occur, which does not meet the requirements of rapid response and high recognition; (3) Temperature-sensing cable method: A temperature-sensing cable is arranged around the high-temperature gas conduit, and the leakage detection is performed through the change of the electrical signal generated by the internal short circuit of the temperature-sensing cable

The structure of the temperature-sensing cable used in this method cannot be restored after the temperature is too high and short-circuited, which does not meet the requirements of the recoverable type.

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