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Accumulator ultralow-temperature leak test device and method

A technology of leak detection and pressure accumulator, 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., which can solve the problems such as the inability to detect the amount of gas leakage of the valve, and achieve convenient ultra-low temperature The effect of leak detection

Active Publication Date: 2015-06-17
SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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  • Application Information

AI Technical Summary

Problems solved by technology

Conventional bubble method, liquid discharge and gas collection method, soap bubble method, etc. cannot detect the air leakage of the valve

Method used

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  • Accumulator ultralow-temperature leak test device and method
  • Accumulator ultralow-temperature leak test device and method
  • Accumulator ultralow-temperature leak test device and method

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, the patent of the present invention is described in further detail. But the present invention is not limited to the following description.

[0029] The structure of an example of the accumulator according to the present invention is as follows: figure 1 As shown, a dumbbell-type metal bellows structure is adopted, including: a liquid chamber, a shell, a bellows, etc.; wherein, the contact surface of the shell and the bellows is a sealing surface. The design technical requirements are as follows: pre-fill P=1.1MPa normal temperature helium in the air chamber 5 of the pressure accumulator bellows, and fill the liquid chamber with 0.7MPa normal temperature helium to maintain the pressure, place the pressure accumulator in a liquid nitrogen environment, Check the airtightness between the diaphragm box and the shell, and the air leakage is required to be no more than 1×10 -6 Pa·m3 / s, the air-conditioning switch is not allowed...

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Abstract

The invention provides an accumulator ultralow-temperature leak test device and method. The device is mainly composed of a vacuum leak test box for containing an accumulator, a liquid nitrogen low-temperature dewar flask connected with the vacuum leak test box through a pipe with a stop valve, a helium cylinder, a nitrogen cylinder, a vacuum pump, a compressed air source, a pressure gauge located in the vacuum leak test box, a temperature sensor, a sealing tool for vertically sealing the accumulator, a glove operation connector located on a box body and the like. The sealing tool is provided with three holes, namely a liquid nitrogen injection opening, a liquid nitrogen discharge opening and a helium injection opening, and the three holes are connected into the external liquid nitrogen low-temperature dewar flask, a safety discharge region and the helium cylinder through inside-outside connection pipes of the vacuum leak test box respectively. Furthermore, the vacuum leak test box is further provided with a helium mass spectrometer access opening, one end of the helium mass spectrometer access opening is connected with an external helium mass spectrometer, and the other end of the helium mass spectrometer access opening is located in a suction cavity in the helium mass spectrometer. By means of the accumulator ultralow-temperature leak test device, ultralow-temperature leak test can be conducted on the accumulator conveniently.

Description

technical field [0001] The invention relates to an ultra-low temperature leak detection test device for a pressure accumulator, in particular to an ultra-low temperature leak detection test device mainly used in the leak detection of low-temperature valves of launch vehicles and similar leak detection in low-temperature environments. [0002] Background technique [0003] The launch vehicle uses dinitrogen tetroxide and unsymmetrical dimethylhydrazine as propellants, and the corresponding valve operating temperature is -40°C to +50°C, which belongs to the category of normal temperature valves; the leak detection method used in its performance test is relatively simple, according to The requirements for the allowable leakage rate index are different, and the air tightness inspection can use flow meter detection method, gas collection method, helium mass spectrometry leak detection method, soap solution method and bubble count method and other methods. [0004] However, since...

Claims

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Application Information

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IPC IPC(8): G01M3/20G01M3/22
Inventor 孟金龙付乐平鲁雪生王文
Owner SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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