Gas inlet system for leak detection of controllable spray gun through remote helium spraying method and using method of gas inlet system

Abstract

The invention discloses a gas inlet system for leak detection of a controllable spray gun through a remote helium spraying method and a using method of the gas inlet system. The gas inlet system involves a gas inlet main pipe, a plurality of branch pipes with different diameters and a gas outlet pipe, wherein the plurality of branch pipes are arranged between the gas inlet main pipe and the gas outlet pipe in parallel, a first pressure sensor is arranged on the gas inlet main pipe, and second pressure sensors are arranged on the positions, close to the gas outlet pipe, of the branch pipes; anda helium source device is connected with the gas inlet main pipe, and a spray gun head is externally connected with the air outlet pipe. The using method of the gas inlet system comprises the following steps that the plurality of branch pipes with different diameters are arranged, and helium with different quantities is introduced so that a helium mass ejected by the spray gun can accurately fallinto a preset range; and pressure values at a gas inlet position and a gas outlet position are simultaneously detected by using the first pressure sensor and the second pressure sensors, so that it is ensured that the quantity and the duration of helium ejected each time are constant. According to the gas inlet system for the leak detection of the controllable spray gun through the remote heliumspraying method and the using method of the gas inlet system, the constant consistency of the flow rate and the duration of the helium in the conveying process is realized, the quantitative comparisonanalysis of the helium spraying method for leak detection is improved, the size and the leak rate of leak holes at different positions to be detected are effectively compared and judged, and accidental errors are reduced.

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 a remote helium injection method and a method for using the same. 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 detect...

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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