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Helium and pressure combined parallel leakage detecting device and method for multiple independent devices

A self-contained, helium-based technology that can solve high maintenance costs, high prices, and limited leak detection gas by detecting the presence of fluid at the leak point, testing fluid tightness, and testing machine/structural components. and other problems, to achieve the effect of reducing leak detection cost, good scalability, and reducing complexity

Pending Publication Date: 2018-11-06
TECH & ENG CENT FOR SPACE UTILIZATION CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has certain disadvantages. First, the detection equipment for various gases is more expensive than helium mass spectrometer leak detectors, and the maintenance cost is high; second, among all the detection gases, helium has the best detection sensitivity and the most mature technology. The detection gas is not as good as helium; the third is that the price of neon, krypton, and carbon tetrafluoride is higher than that of helium, and the cost of leak detection for large-scale equipment is high, and additional maintenance and storage costs will be added
In addition, the leak detection of multiple gas analysis methods is limited by the types of leak detection gases, and the selectable leak detection gases in gas analysis leak detection are limited, so the number of independent devices that can be detected at the same time is also limited

Method used

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  • Helium and pressure combined parallel leakage detecting device and method for multiple independent devices
  • Helium and pressure combined parallel leakage detecting device and method for multiple independent devices
  • Helium and pressure combined parallel leakage detecting device and method for multiple independent devices

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Experimental program
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Effect test

Embodiment 1

[0055] Such as Figure 1-2 As shown, the embodiment of the present invention provides a system of combining helium and pressure to detect multiple independent devices in parallel, including: a pressure detection device 1, a helium leak detection device 2, a helium source 3, a collection chamber 4 and a gas Sampling device 5, described helium gas leak detection equipment 2 comprises standard volume device 16;

[0056] The helium source 3 can communicate with a plurality of independent devices 6, and fill each of the independent devices 6 with helium;

[0057] The pressure detection device 1 includes a plurality of differential pressure gauges 7, and one differential pressure gauge 7 is installed between two adjacent independent devices 6;

[0058] After the independent device 6 is filled with helium, it is placed in the collection chamber 4,

[0059] One end of the gas sampling device 5 is connected to the collection chamber 4, and the other end of the gas sampling device 5 i...

Embodiment 2

[0082] An embodiment of the present invention provides a method for performing helium and pressure joint leak detection on multiple independent devices in parallel according to the system described in Embodiment 1, including the following steps:

[0083] S1, use the auxiliary hose to connect each independent equipment, then vacuum the independent equipment, then fill it with high-purity helium, and then disconnect the auxiliary hose;

[0084] S2, put the entire tested equipment including multiple independent equipment into the collection chamber, turn on the gas sampling device and helium leak detection equipment, and measure the background indication value I of the system 0 ;

[0085] S3, after the cumulative leakage time t, record the differential pressure value Δp of each differential pressure gauge 12 , Δp 23 , Δp 34 …, where Δp 12 Indicates the pressure difference between independent devices 1-2, Δp 23 Indicates the pressure difference between independent equipment 2...

specific Embodiment

[0108] An embodiment of the present invention provides a method for detecting the leak rate of four independent devices. In the case of four independent devices, after the leak detection process, the following four equations can be obtained:

[0109]

[0110]

[0111]

[0112] Q 1 +Q 2 +Q 3 +Q 4 =Q p

[0113] The leak rates for four separate devices can be calculated following the matrix solution:

[0114]

[0115] It can be seen that, using the method provided by the embodiment of the present invention, the data obtained by the system detection can be used to calculate and obtain each independent Therefore, the present invention adopts the above-mentioned method to obtain the respective leak rates of each independent equipment by using only helium as a leak detection gas, which not only utilizes the high sensitivity of helium, but also avoids other The use of leak detection gas reduces the complexity of leak detection equipment and ground support, and reduces...

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Abstract

The invention discloses a helium and pressure combined parallel leakage detecting device and method for multiple independent devices, and relates to the technical field of device leakage detection. The system comprises a pressure detecting device, a helium leakage detecting device, a helium source, a collecting chamber and a gas sampling device, wherein the helium leakage detecting device comprises a standard capacity device; the pressure difference between two adjacent independent devices is detected through the pressure detecting device during use; the total leakage indication value and reference value can be detected through the helium leakage detecting device; the leakage rate of each independent device can be calculated through certain algorithm on the basis of the detected data. Therefore, only the helium for leakage detection is used in the leakage rate detection process of each independent device; the high sensitivity of helium is utilized, moreover, other leakage detecting gasis avoided, therefore, the leakage detecting equipment and the ground supporting complexity can be reduced, and the leakage detection cost is reduced. Additionally, the quantity of the independent devices can be increased without limiting in principle, and the expandability is improved.

Description

technical field [0001] The invention relates to the technical field of equipment leak detection, in particular to a system and method for combining helium and pressure to detect multiple independent equipment in parallel. Background technique [0002] At present, in aerospace, petrochemical, thermal refrigeration and other fields, it is necessary to use equipment with strong sealing. When these devices are in use, due to considerations of function, performance, safety, life, etc., it is necessary to perform leak detection on them to check whether their leak rate meets the requirements. [0003] For larger equipment, in special fields, especially in the aerospace field, the helium mass spectrometry leak detection method is generally used, that is, the tested equipment is placed in a larger collection chamber, and a certain pressure of helium is filled into the tested equipment. As the detection gas, after a certain period of leakage accumulation, samples are taken in the col...

Claims

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Application Information

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IPC IPC(8): G01M3/20G01M3/26
CPCG01M3/202G01M3/26Y02E30/30
Inventor 郭栋才盛强曹娇坤杨鹏王泽张羽
Owner TECH & ENG CENT FOR SPACE UTILIZATION CHINESE ACAD OF SCI