What is a vacuum tank helium test? Principles and steps detailed explanation!
Vacuum tank helium inspection is a common detection method, which is mainly used to detect the leakage of vacuum seals. The following are the steps and principles of vacuum tank helium inspection: Vacuum tank helium inspection steps: Put the components to be tested into a vacuum box, and pump the vacuum box into a high vacuum state;
Inject helium (He) into the vacuum chamber to a certain pressure, usually 0.1-1.0 atm, to ensure that the external environment of the components to be tested is a pure helium environment;
Detectors that adsorb helium on one or both sides of the component to be tested are called front detectors and rear detectors, respectively, as required. The helium flow path and negative pressure difference are formed between the front detector and the rear detector.
What is a vacuum tank helium test? Principles and steps detailed explanation!
When there is a helium leak at the location to be measured, the leaking gas enters the flow path from the leak point, reaches the pre-detector and is detected by the detector. The leakage signal is usually obtained through the signal intensifier and audio signal, and the location of the leak point is observed in the lighting room.
Vacuum tank helium detection principle: Vacuum tank helium detection takes advantage of the small molecular mass, dispersion and inertness of helium. Helium molecules are so small that they easily escape from leaks and mix with the air around the part under test. At this time, the negative pressure in the high vacuum state of the vacuum chamber is used to pump away the surrounding mixed gas, leaving helium, so that the external environment of the test site is pure helium. In this state, if there is a leak in the part to be tested, helium will escape and enter the flow path, which will be detected by the front detector and the rear detector successively, forming a leak signal. The location and size of the leak can be determined by observing the location of the leak point in the illuminated room through the strength of the leak signal.
What is a vacuum tank helium test? Principles and steps detailed explanation!
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