Device making diffusion type nitrogen-hydrogen leak detector be not affected by environmental background

Abstract

The invention provides a device making a diffusion type nitrogen-hydrogen leak detector be not affected by environmental background. The device comprises a switching valve, an air storage tank, an air inlet valve, a cover box and the diffusion type nitrogen-hydrogen leak detector. The switching valve, the air storage tank, the air inlet valve, the cover box and the diffusion type nitrogen-hydrogen leak detector are sequentially connected in series through air channels. Part of a detected object or the whole detected object is located in the cover box, the cover box is further connected with an air release valve, and a pressure controller is connected between the switching valve and the air storage tank. The device is used for helping leak detection of the diffusion type nitrogen-hydrogen leak detector, detection is not affected by the environmental background, stability, correctness and accuracy of the diffusion type nitrogen-hydrogen leak detector are improved, the defects of an existing diffusion type nitrogen-hydrogen leak detector are overcome, and the limiting requirements of the diffusion type nitrogen-hydrogen leak detector for the user site environmental background are reduced.

Description

technical field [0001] The invention relates to a gas supply device, in particular to a device for preventing a diffusion 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 diffusion-type nitrogen-hydrogen leak detector is used for leak detection, a certain pressure of tracer gas is filled into the object to be tested to cover all or part of the object to be tested, and the diffusion-type nitrogen-hydrogen leak detector passes through the detection cover. It can be judged whether there is a leak by increasing the concentration of the tracer gas leaked from the housing part. However, while covering the leaked tracer gas, the ambient background air is also covered. The general environmental background composition of the industrial site is relatively complex and unstable. Stable, so the detection results are also affected by environmental backgr...

AI Technical Summary

Problems solved by technology

[0004] 1. When the ambient background tracer gas concentration is high or there is interference gas, the leakage cannot be detected or cannot be used;

[0005] 2. High background requirements for the use environment

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