Leakage detecting device for ordinary pressure detection of vacuum sampling

Abstract

The invention discloses a leakage detecting device for ordinary pressure detection of vacuum sampling, and belongs to the technical field of airtightness testing. The device comprises a vacuum box andis characterized in that the vacuum box is communicated with a sampling pipe, the sampling pipe is connected with a sampling mechanism, and the sampling mechanism converts a gas sample taken from thevacuum box into the ordinary pressure state from the vacuum state and provides the to-be-detected gas sample in the ordinary pressure state for a detector. According to the leakage detecting device,the sampling mechanism can convert the gas sample taken from the vacuum box into the ordinary pressure state from the vacuum state, on the one hand, the vacuum box can quickly provide the gas sample of higher concentration only in limited space, the vacuum degree of the vacuum box does not depend on the requirements of the detector, the pressure range of the vacuum box is expanded, and the detecting accuracy grade is increased; on the other hand, an existing helium leakage detecting mode can be broken through, wide detecting mediums of a refrigerant and the like are adopted, and an ordinary pressure detector with higher cost-performance ratio is prepared.

Description

technical field [0001] The invention belongs to the technical field of sealing test, in particular to a leak detection device for vacuum sampling and normal pressure detection. Background technique [0002] At present, there are usually two methods for air tightness testing of pipelines and chambers: positive pressure method and negative pressure method. The positive pressure method is to fill the pipeline or chamber with a certain pressure detection medium, and then use a pump to send the gas outside the pipeline or chamber into the leak detector for detection, and determine whether there is a leak by whether the gas contains the detection medium. On the one hand, this detection method cannot guarantee the purity of the working environment. On the other hand, the performance of the leak detectors used is uneven, resulting in interference problems, and the detection results are not accurate enough. Therefore, the negative pressure method is used in high-precision detection. ...

AI Technical Summary

Problems solved by technology

This detection method requires the pressure level in the vacuum box to be consistent with that of the detector, which on the one hand greatly reduces the working pressure range of the vacuum box; The reliability and the performance of each vacuum pump will affect the repeatability and accuracy of the test results, so that the structure is complicated and the reliability is not high

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