Refrigerating machine jacket structure for superconduction magnet and installation and disassembly method of refrigerating machine jacket structure

Abstract

A refrigerating machine jacket structure for a superconduction magnet and an installation and disassembly method of the refrigerating machine jacket structure relate to the technical field of low-temperature engineering and superconduction magnets. The refrigerating machine jacket structure sequentially comprises a refrigerating machine flange seat (3), a primary corrugated pipe (11), a primary flange seat (12), a secondary corrugated pipe (21) and a secondary flange seat (22) from top to bottom, wherein thermal connection is formed between a cold screen and the primary flange seat 12), thermal connection is formed between a superconduction coil and the secondary flange seat (22), the refrigerating machine flange seat (3) and the primary flange seat (12) are connected by the primary corrugated pipe (11), and the primary flange seat (12) and the secondary flange seat (22) are connected by the secondary corrugated pipe (21). The refrigerating machine jacket structure has the characteristics of low conduction thermal leakage, high vacuum tightness, high thermal connection efficiency and long lifetime of a refrigerating machine.

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

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