Method for drafting differential pressure and leakage amount relation curve in leak detection of seal article

Abstract

A method for drawing a curve of the relationship between differential pressure and leakage rate during leak detection of sealed products is conducted on a leakage detection device for the sealed products by using a volume calibrator. The method is characterized in that the implementation steps are as follows: the volume calibrator is connected on a sealed container in which a unit under detection is positioned; a detecting point is set according to the required detecting range; different Delta V is adjusted by the volume calibrator; the particular value of differential pressure Delta PR corresponding to different Delta V is detected by the differential-pressure-type leakage detection device for sealed products; and then a curve of low leakage rate and a curve of high leakage rate in the curve of the relationship between differential pressure Delta PR and leakage rate are respectively finished. The method has the advantages that the principle is scientific, and no complex calculation is needed; the operation is simple, practical and easy to implement; by using the curve to detect, the accuracy rate is high.

Description

(1) Technical field [0001] The invention relates to a leak detection method for a sealed product, in particular to a method for drawing a relationship curve between a pressure difference and a leakage amount in the leak detection of a sealed product. (2) Background technology [0002] At present, the methods used in leak detection devices for sealed products mainly include: dye penetration leak detection method, heating bubble emission leak detection method, weight increase leak detection method, radioisotope leak detection method and optical leak detection method. These methods are complex in process, low in efficiency and high in cost, and some of them are destructive inspection methods. In addition, there is a differential pressure airtight leak detection method, which is mainly used for leak detection of non-sealed products such as automobile fuel tanks, air-conditioning pipelines, etc., but cannot be used for leak detection of sealed products such as electronic chips. ...

AI Technical Summary

Problems solved by technology

Since there are many parameters involved in the calculation, the calculation steps are very complicated, and there is a relatively large error between the selected parameters and the actual data, so the accuracy of the curve drawn by using the theoretical calculation method is low, and the effect is not ideal

Images