Testing system for low-temperature valve

Abstract

The invention belongs to the field of refrigeration and low-temperature engineering, and discloses a testing system for a low-temperature valve. The system comprises a refrigeration unit, a test device, a data acquisition and monitoring unit and a gas evacuation and replacement device; the refrigeration unit is used for providing a low-temperature test working medium for the test device; the gas evacuation and replacement device is used for carrying out gas replacement on a transmission pipeline in the test device; the test device is used for detecting internal and external leakage rates of the low-temperature valve, valve flow characteristics and valve reliability; the data acquisition and monitoring unit is used for displaying and storing experimental data of the test device in the testing process of the low-temperature valve in real time; the refrigeration unit comprises a helium compressor unit, a cold box and a helium transmission pipeline; the helium compressor unit is connected with the cold box through the helium transmission pipeline; the cold box is connected with the test device; the helium compressor unit pressurizes helium and then inputs the helium into the cold box for cooling; and the cold box outputs low-temperature high-pressure helium to the test device. The testing system is suitable for testing low-temperature valves with the temperature range of 2.2-300K and the pressure range of 1bar-20bar.

Description

technical field [0001] The invention relates to the technical field of refrigeration and low temperature engineering, in particular to a low temperature valve testing system. Background technique [0002] In recent years, with the development of superconductivity and cryogenic refrigeration technology, large-scale helium cryogenic refrigerators have been more and more widely used. Among them, the applications in the fields of nuclear fusion and particle accelerators are the main ones. They are mainly used to provide liquid nitrogen, liquid hydrogen, liquid helium to superfluid helium cooling medium for low temperature users such as superconducting magnets and superconducting coils. The most commonly used actuators in the operation of large helium cryogenic refrigerators are cryogenic valves, usually with an operating pressure range of 1.05 to 20 bar and a temperature range of 2.2K to 300K. The reliability of cryogenic valves for long-term operation at low temperatures and t...

AI Technical Summary

Problems solved by technology

However, the method of adjusting the air supply temperature of the valve by controlling the refrigerator has the following disadvantages: first, the temperature adjustment speed is relatively slow; second, the pressure and temperature at the outlet of the refrigerator are difficult to reach the test conditions required by the valve at the same time; third , during the reliability test of the valve, frequently adjusting the outlet temperature of the refrigerator will reduce the service life of the refrigerator, and the refrigerator below the liquid nitrogen temperature zone is often expensive

However, there is no relevant patent description for the valve performance test at a temperature as low as close to the 2.2K temperature zone of superfluid helium.

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