Device and detection method for detecting airtightness of large-cavity multi-sealing structure container

Abstract

The invention discloses a device and method for detecting the airtightness of a large-cavity multi-sealing structure container, and the device is characterized in that a first through hole is formed in one side of the large-cavity multi-sealing structure container, and is sequentially connected with a vacuum gauge with a standard leak hole, a first valve and a roots pump through a connecting pipeline; a pipeline connected with a second through hole of the device on the side is connected with a rotary vane pump through a second valve, a third through hole is formed in the other side of the large-cavity multi-sealing structure container, and a pipeline connected with the third through hole is connected with a leak detector through a molecular pump. The detection method comprises the following steps: sequentially opening and closing the rotary vane pump and the roots pump to enable a detected piece to reach a specified vacuum degree, opening the detector and the molecular pump, opening a standard leak hole, respectively installing a helium cover on each sealing part of the detected piece, and determining the position of the leak hole. According to the invention, the leakage link can be accurately positioned, the leakage detection sensitivity is improved, the local helium cover is accurately positioned, the response time of a leakage detection system is effectively shortened, the air exhaust time of the system is shortened, and the leakage detection efficiency is improved.

Description

technical field [0001] The invention belongs to a large-cavity multi-seal structure container air-tightness detection device and a detection method thereof, in particular to an air-tightness detection device and a detection method of a large-cavity multi-seal structure container such as an explosion container and a spacecraft. Background technique [0002] The common methods of vacuum leak detection include the blowing method and the helium hood method. The helium hood method can measure the overall leak rate or the local leak rate of the tested part because it can gather the helium source to accurately locate it. This method is very effective for the inspected parts with small volume and simple structure in the leak detection part. When the volume of the leak detection part is large, the leak detection system has problems such as low leak detection sensitivity and long response time, which makes it impossible to accurately locate the multi-seal structure. [0003] There ar...

AI Technical Summary

Problems solved by technology

When the volume of the leak detection part is large, the leak detection system has problems such as low leak detection sensitivity and long response time, which makes it impossible to accurately locate the multi-seal structure

[0003] There are problems such as low leak detection sensitivity and long response time of the leak detection system in the leak detection of large cavity containers

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