Method and system for measuring overall leakage rate of complex container based on constant temperature and positive pressure method

Abstract

The present invention discloses a system for measuring the overall leakage rate of a complex container based on a constant temperature and positive pressure method. The system comprises a vacuum pump, a first valve, a container to be tested, a second valve, a constant temperature box, a pressure sensor, a third valve, a fourth valve and a nitrogen source; the vacuum pump is communicated with the container to be tested through the first valve; the second valve is connected with the container to be tested and is adopted as a vent valve of the container to be tested; the pressure sensor is communicated with the container to be tested; the nitrogen source is connected with the container to be tested through the third valve; the fourth valve is installed between the third valve and the nitrogen source; and the container to be tested is placed in the constant temperature box. When the leakage rate of the complex container is measured, the container to be tested is arranged in the constant temperature box; nitrogen is introduced into the container, so that the inner pressure of the container can achieve about 1 atm+1000Pa; the relationship curve of the pressure intensity change of the container and time is recorded; and the overall leakage rate of the container is calculated through the change rate of pressure intensity. The system of the invention has the advantages of high measurement precision, simple system structure and easiness in operation.

Description

technical field [0001] The invention relates to a method for measuring the leak rate of a complex container, in particular to a method and system for measuring the overall leak rate of a complex container based on a constant temperature and positive pressure method. Background technique [0002] Leak detection is an important part of vacuum technology, and the leak detection technology of vacuum containers is a necessary step before manufacture, installation, commissioning and experiment. [0003] In vacuum engineering, because the equivalent size of the leak hole is very small, it cannot be measured. Even if it can be measured, it is impossible to measure the size of each leak hole one by one for a vacuum system. Therefore, the leak rate is used to measure the size of the leak hole in vacuum engineering. In production and scientific practice, people have created various leak detection methods, and the leak detection methods used are measured according to sensitivity requir...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the leakage rate of complex containers in the common leak detection means is affected by the background pressure and the measured container leak rate has a large error due to changes in the surrounding temperature and environment, and provides a A system and method for measuring the overall leak rate of complex containers based on constant temperature and positive pressure method

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