Gas leakage detecting device and detecting method thereof

Abstract

The invention provides a gas leakage detecting device and a detecting method thereof. The gas leakage detecting device and the detecting method thereof are capable of performing high-efficiency and high-sensitivity detection on gas leakage of an airtight vessel at high altitude and are applicable to rapid detection of airtightness and rapid positioning of a large flexible structural vessel. The device is characterized in that a creeping and positioning assembly is used for carrying a mass spectrometer; a single leaking point of an airship is quantified and positioned at high altitude by adopting a tracer gas method, so that the detection can be quickly and efficiently carried out; in addition, a vacuum pump is used for rapidly pumping gas, thus gas in a certain volume can be concentrated and stored in a vacuum chamber within the shortest time, and as a result, the gas collecting capacity is improved; the mass spectrometer is used for sampling and detecting concentrated and mixed gas inthe vacuum chamber by utilizing a circulating fan, and thus the equipment detection efficiency is improved. According to the device, the gas is collected by adopting an injection and gas collecting unit; compared with a general gas collecting device, an injection hole is added, so that the detection sensitivity is improved; a chuck body is used for adsorbing a detected target under negative pressure as well as absorbing gas.

Description

technical field [0001] The invention belongs to the technical field of airship surface detection, is based on a tracer gas leak detection method, and in particular relates to a gas leakage detection device and a detection method thereof. Background technique [0002] An airship is an aircraft that uses helium as the buoyant gas to provide buoyancy. The skin material of an airship, especially a stratospheric airship, is a laminated composite material composed of a weather-resistant layer, a barrier layer, a fabric layer and an adhesive layer, which are required to have high specific strength, high barrier, and anti-aging properties. Therefore, the amount of helium leakage is an important performance index of the skin material of the airship capsule. The leakage of helium mainly includes two ways: one is the leakage of helium diffusion and penetration, and the leakage of helium through the skin material is the material itself. The characteristics of the property are inevitabl...

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Problems solved by technology

Relevant foreign units have used mass spectrometry equipment to carry out related airship air leak detection tests, such as Google balloons and the American HiSentine high-altitude airship. Although they have certain effects, there are the following problems: the efficiency is very low when working at high altitudes; When materials are damaged (especially thin-film materials), the pressure and load-bearing capacity of the boat bag is limited. Under low pressure, the leakage of helium gas is low, and the sensitivity of the instrument is reduced; the gas collection port of traditional mass spectrometry equipment is a microgun needle tube structure , the gas collection port has a small diameter (less than 5 mm), and the air suction efficiency is low. It is suitable for small targets and local fine detection in small areas, and is not suitable for defect detection in large areas (the surface area of ​​airships is generally thousands to tens of thousands of square meters)

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