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Device and method for testing leakage rate of composite material flange in liquid oxygen temperature environment

A technology of composite materials and temperature environment, which is applied in the direction of detecting the appearance of fluid at the leakage point and using liquid/vacuum degree to measure the liquid tightness, etc., can solve the problem of not being found, improve the test accuracy, and have strong applicability Effect

Pending Publication Date: 2022-03-25
SHANGHAI SPACE PRECISION MACHINERY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no special test equipment and method for the sealing performance of composite material flanges in the liquid oxygen temperature environment in China, and no similar information at home and abroad has been found.

Method used

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  • Device and method for testing leakage rate of composite material flange in liquid oxygen temperature environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] figure 1 Shown is a structural diagram of a leak rate testing device for a composite material flange in a liquid oxygen temperature environment in Example 1 of the present invention.

[0029] see figure 1 , the leak rate testing device of the composite material flange in the liquid oxygen temperature environment of this embodiment includes a helium cylinder group decompression device, a cryogenic flange test device, a liquid nitrogen storage device, a helium gas leak rate testing device 5 and a cryogenic container 7 The decompression device for the helium cylinder set includes a helium cylinder set 1, a first shut-off valve 2, a pressure reducing valve 3 and a pressure relief valve 4; the low-temperature flange test device includes a composite material flange 9, an inner cylinder 12 , an inner cylinder bottom cover 10 and an outer cylinder 8; the liquid nitrogen storage device includes a liquid nitrogen storage tank 15 and a second shut-off valve 14.

[0030] One end ...

Embodiment 2

[0043] This embodiment provides a helium leak detection method for a composite material flange in a liquid oxygen temperature environment, including:

[0044] Install the low-temperature test device in the low-temperature container 7; the high-pressure helium output from the helium cylinder group 1 is decompressed by the pressure reducing valve 3 and injected into the inner cylinder 12 of the low-temperature test device. When the helium gas in the inner cylinder 12 of the low-temperature test device After the air pressure reaches the set pressure, the pressurization is stopped (that is, the helium cylinder group 1 stops outputting high-pressure helium), and the pressure is maintained for a certain period of time; the liquid oxygen tank 15 injects liquid oxygen into the cryogenic container 7 through the infusion line, so that the helium in the inner cylinder 12 After the temperature of the gas drops, when the temperature of the helium drops to the liquid oxygen temperature, open...

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Abstract

The invention discloses a leak rate testing device and a leak rate testing method for a composite material flange in a liquid oxygen temperature environment. The leak rate testing device comprises a helium tank group decompression device, a low-temperature flange testing device, a liquid nitrogen storage device, a helium leak rate testing device and a low-temperature container, the low-temperature flange test device comprises a composite material flange, an inner cylinder, an inner cylinder bottom cover and an outer cylinder, the inner cylinder bottom cover is positioned on one side of the opening end of the inner cylinder and is connected with the composite material flange; the inner cylinder is arranged in the outer cylinder and is connected with the outer cylinder; a gap is reserved between the inner cylinder and the outer cylinder; helium is injected into the inner cylinder by the helium cylinder group pressure reducing device; the low-temperature flange test device is arranged in the low-temperature container, and the liquid nitrogen storage device injects liquid nitrogen into the low-temperature container; and the helium leakage rate testing device is connected with the low-temperature flange testing device. The invention plays an important role in developing the use of the composite material flange on the rocket liquid oxygen storage tank, and has the advantages of strong operability, high safety and reliable test result.

Description

technical field [0001] The invention relates to a leakage rate test device and a test method of a composite material flange in a liquid oxygen temperature environment, and belongs to the technical field of sealing performance verification of a composite material flange in an ultra-low temperature environment. Background technique [0002] In recent years, with the development of new low-temperature rockets, high-efficiency and environmentally friendly liquid oxygen fuels have been applied to rocket propellants. Due to the light weight and high strength of carbon fiber materials, the rocket oxidant storage tanks are gradually wound with anti-oxidant resin-bonded carbon fibers, and the upper flange structure of the storage tanks has also begun to use high-temperature-cured carbon fiber composite materials. Since the composite material flange is installed in the manhole of the liquid oxygen storage tank, and liquid oxygen has low temperature characteristics, in order to verify ...

Claims

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Application Information

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IPC IPC(8): G01M3/20
CPCG01M3/20
Inventor 黄云周鹏飞王飞贾跃杰陈辉潘洋
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST