Method for detecting leakage of spacecraft cabin by differential pressure

A differential pressure leak detection and spacecraft technology, which is applied in the direction of measuring the increase and decrease rate of the fluid, using the liquid/vacuum degree to measure the liquid tightness, etc., to achieve the effect of avoiding over-range

Inactive Publication Date: 2010-06-16
BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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Problems solved by technology

The spacecraft cabins are all produced in one piece, and it is impossible to find a reference object with the same size, shape and material for the tested cabin. Therefore, the differential pressure leak detection technology has never been used in spacecraft leak detection before.

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  • Method for detecting leakage of spacecraft cabin by differential pressure
  • Method for detecting leakage of spacecraft cabin by differential pressure

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Embodiment Construction

[0022] The following is a specific implementation manner of the content of the present invention, and the content of the present invention will be further clarified through the specific implementation mode below. Of course, the following specific embodiments are described only to illustrate different aspects of the present invention, and should not be construed as limiting the scope of the present invention.

[0023] The principle of the present invention is as follows: the reference object used in the leak detection process has been proved to be leak-proof with other leak detection methods such as helium mass spectrometry, and in the inflation and balancing steps, since the reference object and the spacecraft cabin body to be tested are connected , so the differential pressure sensor reads zero. At the beginning of the test procedure, the reference object is isolated from the cabin of the spacecraft under test. At this time, if the cabin of the spacecraft under test leaks, th...

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Abstract

The invention provides a method for detecting leakage of a spacecraft cabin by differential pressure. The method comprises the following processes: aerating, balancing, testing and gas deflating. In the method, a small-volume primary standard substance is put in a large-volume spacecraft cabin; standards and a temperature inside the measured cabin are measured when the differential pressure is measured; actually measured differential pressure is compensated by a temperature lagging for some time according to an ideal gas state equation; and finally integral leakage of the measured spacecraft cabin is acquired. In a gas path of the method, an aerating isolating valve is arranged on both sides of a differential pressure sensor respectively and used for avoiding an overrange phenomenon of the differential pressure sensor in the process of aerating or deflating.

Description

technical field [0001] The invention relates to a differential pressure leak detection method, in particular to a differential pressure leak detection method for spacecraft cabin leak rate testing. Background technique [0002] At present, the total leak rate test of the spacecraft cabin in my country generally adopts the absolute pressure change leak detection method. This method determines the total leak rate by measuring the change of the absolute pressure of the spacecraft cabin under test by an absolute pressure gauge. With the continuous development of aerospace technology, the volume of spacecraft cabins is getting larger and larger, and the requirements for leak rate indicators are getting higher and higher. Limited by the accuracy of absolute pressure gauges, the accuracy of absolute pressure change leak detection methods can no longer meet future models. Requirements for cabin total leak rate test. [0003] The differential pressure leak detection method takes the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/26
Inventor 孟冬辉闫荣鑫喻新发郭欣
Owner BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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