A refrigerator jacket structure for a superconducting magnet and its installation and disassembly method

Abstract

A refrigerator jacket structure for superconducting magnets and methods for its installation and disassembly, which relate to the technical fields of cryogenic engineering and superconducting magnets; from top to bottom, it includes a refrigerator flange seat (3), a first-stage bellows ( 11), the first-stage flange seat (12) that forms a thermal connection with the cold shield, the second-stage bellows (21), and the second-stage flange seat (22) that forms a thermal connection with the superconducting coil; the flange seat of the refrigerator (3) is connected with the primary flange seat (12) through the primary bellows (11), and between the primary flange seat (12) and the secondary flange seat (22) through the secondary bellows (21 ) connection; it has the characteristics of low conduction heat leakage, high vacuum sealing performance, high thermal connection efficiency, and long life of the refrigerator.

Description

technical field [0001] The invention relates to the technical fields of cryogenic engineering and superconducting magnets, in particular to a refrigerator jacket structure for superconducting magnets and methods for installing and disassembling the same. Background technique [0002] The superconducting magnets of most magnetic resonance imaging (MRI) systems currently in clinical use are filled with expensive liquid helium (LHe) to maintain the critical temperature required for low-temperature superconducting wires. However, the rising price of liquid helium and the possible shortage of liquid helium resources have greatly increased the demand for liquid helium-free magnets. Compared with liquid helium magnets, liquid helium-free magnets do not require liquid helium as a refrigerant, and only the refrigerator controls the working environment temperature. However, the cooling power of current refrigerators is limited, such as the second-stage pulse tube refrigerator and the ...

AI Technical Summary

Problems solved by technology

[0003] Since the refrigerator of the superconducting magnet needs to be replaced and maintained after working for a period of time, the traditional jacket structure of the refrigerator will destroy the airtight structure of the superconducting magnet during installation and disassembly, and a liquid-free helium magnet needs a good vacuum environment to meet Heat insulation from the outside world, which cannot meet the requirements of liquid helium-free magnets for airtight performance

[0004] The upper end of the pipe wall of the traditional jacket is connected to the room temperature, and the lower end is connected to the inside of the superconducting magnet. For the liquid helium magnet, which does not require strict heat leakage, the heat leakage through the jacket pipe wall is easily taken away by the vaporization of the liquid helium. , but the non-liquid helium magnet has extremely high requirements for heat leakage, and the traditional jacket structure cannot meet the requirements

[0005] When the traditional refrigerator is installed, the thermal connection efficiency of the cold head of the refrigerator is not high, the indium contact sheet cannot fully contact with the cold head of the refrigerator, and the heat transfer efficiency cannot meet the needs of a liquid-free helium magnet

Images