Air intake system of controllable spray gun for leak detection by remote helium injection method

Abstract

The invention discloses an air intake system of a leak detection controllable spray gun with a remote helium injection method and a method for using the same. The air intake system includes an air intake main pipe, a plurality of branch pipes with different diameters and an air outlet pipe, and a plurality of branch pipes are arranged in parallel on the air intake main pipe. Between the air inlet pipe and the air outlet pipe, a first pressure sensor is set on the main air intake pipe, and a second pressure sensor is arranged on each branch pipe close to the air outlet pipe; The method of use is to introduce a number of different quantitative helium by setting a plurality of branch pipes with different diameters, so that the ejected helium mass can accurately fall within the preset range, and at the same time, the first pressure sensor and the second pressure sensor are used to detect the progress. The pressure values ​​at the gas end and the gas outlet ensure that the amount and duration of helium ejected each time are constant. The invention realizes that the flow rate and the duration of the helium gas are constant and consistent during the transportation process, improves the quantitative comparative analysis of leak detection by the helium spray method, effectively compares and judges the size and leak rate of leak holes at different detected locations, and reduces accidental errors.

Description

technical field [0001] The invention relates to the technical field of vacuum system leak detection, in particular to an air intake system of a controllable spray gun for leak detection by remote helium spraying method. Background technique [0002] The pressures encountered in accelerator vacuum systems are so low that it is extremely difficult to directly measure their pressure effects. Leak detection is an important step in obtaining the vacuum of the accelerator. If the predetermined ultimate vacuum cannot be drawn in the accelerator vacuum system, the main reason is the existence of air leakage, except for the outgassing of materials and the abnormal operation of the pump. Leak detection methods commonly used in accelerator vacuum systems include helium mass spectrometer leak detection method, quadrupole mass spectrometer leak detection method and vacuum gauge leak detection method. Among them, the helium mass spectrometer leak detection method is a quantitative measur...

AI Technical Summary

Problems solved by technology

[0003] During the leak detection process of helium injection method, the response time of helium at each leak detection position needs to be estimated. If the vacuum pipeline is long, the time for the helium signal to appear is also relatively slow, because it takes the necessary time to wait for the largest leak signal to appear Therefore, leak detection workers are often troubled by specious leaks during helium injection operations, which greatly affects the efficiency and accuracy of leak detection

[0004] However, in the current actual leak detection operation, the helium source or helium gun used often forms a helium concentration distribution with an uncertain concentration and gradient in a space much larger than the helium injection area, making it difficult to accurately detect the leak point. Locating and Quantifying

Helium at different locations and at different times cannot achieve consistent distribution and concentration, resulting in the inability to compare and judge multiple leak points

At the same time, the concentration of the helium source will cause inconsistencies over time, and the response of the helium mass spectrometer leak detector will also change and change greatly, making it difficult to give an effective judgment on the size of the leak.

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