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Space extrusion normal-pressure accumulating leak detecting system and method

A leak detection and space technology, applied in the field of space extrusion atmospheric pressure cumulative leak detection system, can solve the problems of reduced leak detection efficiency, increase of the minimum detectable leak rate of the leak detection system, leakage, etc., so that the total gas volume does not decrease , Reduce the detectable leak rate and improve the detection efficiency

Active Publication Date: 2015-12-30
AEROSPACE DONGFANGHONG SATELLITE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the increase in the volume of the inner cavity will increase the minimum detectable leak rate of the leak detection system, causing leaks smaller than this minimum detectable leak rate to be unable to be measured; if the minimum detectable leak rate of the leak detection system is reduced by increasing the cumulative time of leak detection Leak rate, the minimum detectable leak rate of the leak detection system is reduced to a fraction of the original value, and the new cumulative leak detection time will be several times the original cumulative time, thus greatly reducing the leak detection efficiency

Method used

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  • Space extrusion normal-pressure accumulating leak detecting system and method
  • Space extrusion normal-pressure accumulating leak detecting system and method
  • Space extrusion normal-pressure accumulating leak detecting system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] (1) Install the inspected product filled with the leak-indicating medium in the collection container;

[0089] (2) Install a fixed space extrusion device in the collection container to squeeze out the excess space. The volume of the extrusion space device remains unchanged during the detection period, and the volume of the collection container also remains unchanged;

[0090] (3) Seal the collection container, and stir the gas in the collection container in a circular array to form a uniform circulating air, so that the gas in the collector can be mixed quickly and evenly;

[0091] (4) Collect and accumulate the leaking working medium leaked from the inspected product through the collection container, and the minimum accumulation time is calculated according to the following formula:

[0092] t m = I n p c ...

Embodiment 2

[0120] (1) Install the inspected product filled with the leak-indicating medium in the collection container;

[0121] (2) Install a retractable space extrusion device in the collection container, operate and extend the device, and squeeze out the excess space. The volume of the space extrusion device remains unchanged during the detection period, and the volume of the collection container also remains unchanged;

[0122] (3) Seal the collection container, and stir the gas in the collection container in a circular array to form a uniform circulating air, so that the gas in the collector can be mixed quickly and evenly;

[0123] (4) Collect and accumulate the leaking working medium leaked from the inspected product through the collection container, and the minimum accumulation time is calculated according to the following formula:

[0124] t m = I n p ...

Embodiment 3

[0152] (1) Install the inspected product filled with the leak-indicating medium in the collection container;

[0153] (2) Install a fixed space extrusion device in the collection container to squeeze out the excess space. The volume of the extrusion space device remains unchanged during the detection period, and the volume of the collection container also remains unchanged;

[0154] (3) Seal the collection container, and stir the gas in the collection container in a circular array to form a uniform circulating air, so that the gas in the collector can be mixed quickly and evenly;

[0155] (4) Collect and accumulate the leaking working medium leaked from the inspected product through the collection container, and the minimum accumulation time is calculated according to the following formula:

[0156] t m = I n p c ...

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Abstract

The invention discloses a space extrusion normal-pressure accumulating leak detecting system which comprises a collecting container, a space extruding device, a draught fan stirring device, a leak detector, a gas sampling and backfilling device, a leak detecting calibration device and a detected product. A leak detecting working medium is contained in the detected product, and can be leaked into the collecting container. The space extruding device is arranged in the collecting container, and can compress and occupy space, except for the detected product, in the collecting container. The draught fan stirring device is mounted in the collecting container, and used for stirring gas in the collecting container, so that all kinds of gas are evenly mixed. The gas in the collecting container is sampled in real time through the gas sampling and backfilling device, part of the sampled gas is conveyed to the leak detector in real time, and the rest of the gas is conveyed back to the collecting container in real time. The sampled gas is conveyed and circulated through the gas sampling and backfilling device, the defect of the exhaust capacity of the leak detector is overcome, and pressure losses are reduced.

Description

technical field [0001] The invention relates to a leak detection system and method for reducing the existing accumulation space and lowering the minimum detectable leak rate of the leak detection system, in particular to a space extrusion normal pressure accumulation leak detection system and method. Background technique [0002] All kinds of equipment with sealing performance need to be tested for their sealing performance during the development process. In order to detect the tightness of sealing equipment, it is necessary to measure its sealing performance indicators by appropriate methods. One of the methods adopted is helium mass spectrometry atmospheric pressure accumulation leak detection method. The principle of this method is to seal the equipment filled with the leak detection working fluid (helium) in a closed collector, the leaked leak detection working fluid gradually accumulates in the collector, and the partial pressure of the leak detection working fluid con...

Claims

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Application Information

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IPC IPC(8): G01M3/20
Inventor 薛长利郝佳丁勤魏泽军肖连辉
Owner AEROSPACE DONGFANGHONG SATELLITE
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