High-sensitivity vacuum leakage detection device

Abstract

The invention discloses a high-sensitivity vacuum leakage detection device, and the device comprises a vacuum cover assembly, a vacuum pumping system, and a pressure precise control assembly. The vacuum cover assembly comprises a vacuum cover body and a sealing strip. The edge of the opened end of the vacuum cover body is annularly connected with a sealing groove in a fixed manner, and the sealingstrip is disposed in the sealing groove. An outer side of the sealing strip is provided with observation window glass. The vacuum pumping system comprises a vacuum pump, and the vacuum pump is communicated with the vacuum cover body through a corresponding air pipe and an inlet valve, and is used for vacuum pumping. The pressure precise control assembly comprises a pressure regulating valve and ahigh-precision negative pressure meter, and the pressure regulating valve and the high-precision negative pressure meter are disposed on the vacuum cover body, and are respectively used for regulating and observing the pressure value in the vacuum cover body. The device provided by the invention reduces the weight, improves the leakage detection sensitivity and the reliability and operability, and reduces the labor intensity of the inspection personnel.

Description

technical field [0001] The invention belongs to the technical fields of non-destructive testing such as nuclear power, aviation, aerospace, automobile, high-speed rail, and conventional power stations, and in particular relates to a high-sensitivity vacuum leak detection device. Background technique [0002] The product material of the traditional non-destructive testing vacuum leak detection device is cast aluminum, and the weight of the equipment is too heavy; it is inconvenient to carry in a radioactive pollution environment, it is very heavy, and it is not easy to decontaminate; the observation window is narrow and the lighting is insufficient, and it needs to be used separately on site. Equipped with lighting; the sealing strip is made up of several sections, with joints, easy to leak, poor sealing, unstable pressure control, many interference signals during leak detection, it is not easy to distinguish defect signals, low sensitivity, and on-site operation It is inconv...

AI Technical Summary

Problems solved by technology

[0002] The product material of the traditional non-destructive testing vacuum leak detection device is cast aluminum, and the weight of the equipment is too heavy; it is inconvenient to carry in a radioactive pollution environment, it is very heavy, and it is not easy to decontaminate; the observation window is narrow and the lighting is insufficient, and it needs to be used separately on site. Equipped with lighting; the sealing strip is made up of several sections, with joints, easy to leak, poor sealing, unstable pressure control, many interference signals during leak detection, it is not easy to distinguish defect signals, low sensitivity, and on-site operation It is inconvenient and easy to miss inspection; and the installation and disassembly of the external extraction pipeline is difficult, and it is not easy to replace, which seriously affects the on-site use of non-destructive inspection personnel, reduces the detection speed, and affects the quality of detection. Therefore, it is necessary to design a new type of portable leak detection with light weight and high sensitivity. vacuum leak detection device

[0003] The present invention proposes a vacuum leak detection device, which overcomes the shortcomings of the above-mentioned existing product detection object, and can be tailored according to the size of the object to be inspected, and made into a special-shaped cover suitable for various objects to be inspected, such as: checking L-shaped , convex, triangular and other special-shaped welds and flat structures

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