Gas tightness detection device and detection method

Abstract

The invention provides a gas tightness detection device and a detection method. The detection method comprises the following steps of opening a gas source and a valve body, and inputting gas with samepressure into a test object and a standard object through a gas pipe and the valve body; and closing the valve body, using a differential pressure sensor to measure a differential pressure value between the test object and the standard object, and in preset time, if the differential pressure value is determined to be greater than a preset differential pressure threshold, emitting an alarm by an alarm apparatus connected to the differential pressure sensor. Whether the test object is qualified is determined through determining whether the differential pressure value in the preset time exceedsthe preset differential pressure threshold. By using a traditional gas tightness detection method, manual observation is needed, detection efficiency is low or input air pressure is high so that detection precision is low. Compared with the traditional gas tightness detection method, by using the gas tightness detection method of the invention, a short detection period and high efficiency are realized; the high precision differential pressure sensor with a low measuring range is used and a reference comparison method is adopted so that the test object with a large size and a small leakage ratecan be accurately measured; and measurement precision is increased.

Description

technical field [0001] The invention relates to the technical field of air tightness detection, in particular to an air tightness detection device and a detection method thereof. Background technique [0002] At present, there are many ways to detect and judge whether there is leakage, but the similarity is to fill a certain pressure of gas into the tested part and judge whether the tested part leaks according to the change of air pressure within a certain period of time. The existing air tightness detection methods mainly include the bubble method and the pressure drop detection method. [0003] The bubble method is a traditional air tightness testing method. Its main working principle is to fill the test piece with a certain pressure of gas, then put the test piece into the test liquid, and the gas passes through the leak point of the test piece. The inflow of the test liquid forms air bubbles to determine the leak point, and the leakage gas can be further determined by c...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the defects of slow detection speed and low detection accuracy in the prior art, the present invention provides an air tightness detection device and a detection method thereof

Images