Method and device for detecting gas concentration

A technology of gas concentration and detection method, applied in liquid/vacuum measurement for liquid tightness, by detecting the appearance of fluid at the leak point, etc., can solve the problems of low efficiency, low detection accuracy, and inability to guarantee work quality, etc. Achieve low cost and no manual intervention

Inactive Publication Date: 2016-10-05
H J AUTOMATIC CONTROL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Atmospheric sniffing gun type gas leak detection device has low equipment cost and only needs to be equipped with a gas concentration sensor and a sniffing gun, ...

Method used

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  • Method and device for detecting gas concentration
  • Method and device for detecting gas concentration
  • Method and device for detecting gas concentration

Examples

Experimental program
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Embodiment 1

[0031] A gas concentration detection method described in the present invention utilizes the principle that the diffusion speed of one gas in another gas is inversely proportional to the pressure of the surrounding gas, that is, the characteristic that the tracer gas diffuses faster in a vacuum state , adopting the scientific and reasonable combination of the advantages of vacuum box-type gas leak detection technology and atmospheric suction gun-type leak detection technology, it can not only realize low-cost and fast detection of gas concentration and gas leakage, but also realize automatic detection at the same time No human intervention is required, and leaks can be approximated.

[0032] The gas concentration detection method of the present invention comprises the following steps:

[0033] S1: Place the workpiece to be inspected in a confined space;

[0034] S2: In the confined space, a number of gas suction points are distributed outside the workpiece to be inspected, and...

Embodiment 2

[0043] Such as image 3 with 4As shown, a gas concentration detection device according to the present invention utilizes the principle that the diffusion speed of one gas in another gas is inversely proportional to the pressure of the surrounding gas, that is, the diffusion speed of the tracer gas is faster at low pressure. It adopts the scientific and reasonable combination of the advantages of vacuum box type gas leak detection technology and atmospheric suction gun type leak detection technology, which can realize low-cost and fast detection of gas concentration and gas leakage, and at the same time realize automatic Detect without manual intervention, but also provide approximate location of leaks.

[0044] The gas concentration detection device of the present invention includes a detection box 1 providing a closed space for placing workpieces to be inspected; a tracer gas valve 2 and a tracer gas source connected to the workpiece to be inspected are arranged outside the ...

Embodiment 3

[0052] Such as Figure 5 with 6 As shown, the difference between this embodiment and Embodiment 2 is that the gas sensors are continuously arranged differently, and other structures are the same as Embodiment 2, specifically: each gas suction nozzle 8 is connected to a group of gas suction pumps 9 and The gas sensor valve 6 is connected with a gas sensor 7 uniformly afterwards. This embodiment includes three groups of gas nozzles 8, namely the first gas suction nozzle 81, the second gas suction nozzle 82 and the third gas suction nozzle 83. The first gas suction nozzle 81 is connected to the first gas sensor valve through the pipeline. 61. The first gas suction pump 91 is connected to the gas sensor 7. The second gas suction nozzle 82 is connected to the second gas sensor valve 62, the second gas suction pump 92 and the gas sensor 7 through pipelines. The gas suction nozzle 83 is connected with the third gas sensor valve 63, the third gas suction pump 93 and the gas sensor 7...

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Abstract

The invention discloses a method and a device for detecting a gas concentration. The method comprises the following steps: S1, a to-be-detected workpiece is placed in sealed space; S2, a plurality of gas suction points are distributed outside the to-be-detected workpiece, and each gas suction point is numbered to mark the gas suction point position; S3, vacuum pumping is carried out on the sealed space, and the vacuum pressure can be larger than 100 Pa; S4, a tracing gas is filled inside the to-be-detected workpiece; S5, a gas sensor arranged outside the sealed space carries out gas concentration detection on the suction gas via the gas suction points; and S6, when the gas sensor detects the concentration of the tracing gas at a certain gas suction point reaches a preset leakage value, the leakage position of the to-be-detected workpiece is determined according to the number of the gas suction point. By adopting the above technical scheme of the invention, detection on the gas concentration and the gas leakage can be quickly realized at a low cost, automatic detection is also realized, manual intervention is not needed, and the leakage point can be basically positioned.

Description

technical field [0001] The invention relates to a gas detection technology, in particular to a gas concentration detection method and a device for realizing the method. Background technique [0002] Gas concentration (including gas leak detection) detection technology has a wide range of applications. Among them, vacuum box gas leak detection technology and atmospheric suction gun type leak detection technology are commonly used. detection. [0003] Vacuum box type and atmospheric sniffing gun type gas leak detection technology generally use halogen gas, hydrogen or helium gas as tracer gas, such as figure 1 As shown, the vacuum box type gas leak detection device includes a detection box 1, a vacuum valve 4, a vacuum pump 5, a gas sensor valve 6, a gas sensor 7, a tracer gas valve 2 and a tracer gas source 3. When testing, first open Vacuumize the valve 4, use the vacuum pump 5 to evacuate the detection box 1 to a high vacuum, then open the tracer gas valve 2 and the trace...

Claims

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Application Information

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IPC IPC(8): G01M3/20
Inventor 李建和
Owner H J AUTOMATIC CONTROL TECH
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