Helium leakage test device and method

Abstract

The invention relates to a helium leakage test device and a method. The device consists of a bearing test piece compressed system, a test medium supply system and a test data acquisition system. The bearing test piece compressed system consists of a pressure vessel and an evacuating device. The pressure vessel is fixed on a test table board, the evacuating device and the test medium supply system are respectively connected with the pressure vessel via pipelines, and a test piece is mounted in the pressure vessel and directly connected with the test data acquisition system. The helium leakage test method can measure and display a numerical value of helium permeating from the outside to the inside of the test piece within unit time. The numerical value can clearly show the pressure diffusion performance of the test piece, and visually shows surface porosity of the test piece, and helium leakage test device and the method play an important role in testing and verifying the quality of a cooling water pipe for a water hydrogen system of a large generator set, and further can be used for detecting other products with certain requirements in the aspect of the gas diffusion performance.

Description

technical field [0001] The invention relates to a helium gas leak detection test device and method. Background technique [0002] The helium leak detection method has been widely used in scientific research and industrial sectors. Its main advantage is that it can realize quantitative detection of leak rate under various detection conditions. It has high leak detection resolution and wide measurement range, and is especially suitable for small Accurate determination of leak rate. In the field of aerospace, such as space shuttles, rockets, satellites, etc., helium leak detection technology is used. In the general industrial field, atomic energy, power plants, automobile industry, shipbuilding industry, refrigeration industry, metallurgical industry, etc. are all inseparable from helium leak detection. There are many methods for helium leak detection, mainly including helium injection method, helium absorption method, negative pressure method, bell jar method and so on. Tak...

AI Technical Summary

Problems solved by technology

Taking the pressure diffusion performance of the test piece as an example, the bell jar method has been commonly used for a long time, but this method has high requirements for the manufacture of the bell jar and the accuracy of the helium mass spectrometer leak detector, the detection process is complicated, and the detection cost is high.

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