Device enabling suction type nitrogen and hydrogen leakage detection instrument to be free of influences by environmental background

Abstract

The invention provides a device enabling a suction type nitrogen and hydrogen leakage detection instrument to be free of influences by the environmental background. The device comprises a switch valve, a gas storage tank, a flow limiting valve, a cover box and the suction type nitrogen and hydrogen leakage detection instrument, and the switch valve, the gas storage tank, the flow limiting valve, the cover box and the suction type nitrogen and hydrogen leakage detection instrument are sequentially connected in series through a gas circuit. A part of or all parts of a detected object are located in the cover box, and a pressure controller is connected between the switch valve and the gas storage tank. The device is used for assisting the suction type nitrogen and hydrogen leakage detection instrument to conduct leakage detection, the influences by the environmental background on detection are avoided, stability, validity and accuracy of the suction type nitrogen and hydrogen leakage detection instrument are improved, shortcomings of the suction type nitrogen and hydrogen leakage detection instrument are overcome, and limitation requirements of the suction type nitrogen and hydrogen leakage detection instrument for the environmental background in a user site are reduced.

Description

technical field [0001] The invention relates to a gas supply device, in particular to a device for preventing an inhalation nitrogen-hydrogen leak detector from being affected by environmental background, and belongs to the technical field of leak detection. Background technique [0002] At present, when the inhalation-type nitrogen-hydrogen leak detector is used for leak detection, a certain pressure of tracer gas is filled in the measured object, and whether there is leakage is judged by absorbing the tracer gas leaked from the surface of the measured object, but in While inhaling the leaked tracer gas, the ambient background air is also sucked into the nitrogen-hydrogen leak detector. The background composition of the general environment in industrial sites is relatively complex and unstable, so the test results are also affected by environmental factors in addition to the leaked tracer gas. The influence of background changes leads to errors in the suction nitrogen-hydro...

AI Technical Summary

Problems solved by technology

[0004] 1. Affected by changes in the environmental background;

[0005] 2. When the ambient background tracer gas concentration is high or there is interference gas, the leakage cannot be detected or cannot be used;

[0006] 3. High background requirements for the use environment

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