Low temperature heat tube for thermal switch

Abstract

This is a low temperature heat pipe used to the thermal switch. The body of this heat pipe is double layers stainless steel ripple pipes, inside two layers there are high pressure strong neon gas. On the two ends of this ripple pipe is installed wih high conduct qure copper block, between two blocks are connected with high pure copper electric cable. This heat pipe can be stretched out and drawn back by its working state. The lower end of this heat pipe is fixed with the secondary grade cooling head of refrigerator. The upper end of it is free state. The free end can connect with the first grade cooling head of refrigerator or separate it according to the temperature of magnetic body and refrigerator's first grade cooling head.

Description

technical field [0001] The invention relates to a low-temperature heat pipe used for a heat switch, and relates to the low-temperature technical field of a conduction-cooled superconducting magnet system cooled by a refrigerator. Background technique [0002] Due to the breakthrough of small refrigerator technology and the appearance of high-temperature superconducting current leads, the technology of conduction cooling superconducting magnets has developed rapidly in the past ten years. At present, conduction cooling magnet systems have replaced or are replacing immersion cooling magnets in many application fields. The conduction cooling superconducting magnet system is mainly composed of a superconducting magnet, a small GM refrigerator, a cryogenic container, a current lead, a magnet power supply and control components. Heat transfer within the immersion cooled magnet system is primarily by convection of helium. In contrast, conduction-cooled magnet systems transfer hea...

AI Technical Summary

Problems solved by technology

[0004] Although the low-temperature heat pipe can effectively use the cooling capacity of the first-stage cold head of the refrigerator to cool the superconducting magnet, the heat pipe structure currently used for conduction cooling of the superconducting magnet system has the following defects: whether the heat pipe is at the temperature of the first-stage cold head Below and above the temperature of the secondary cold head, the heat pipe always connects the primary and secondary cold heads of the refrigerator through metal tubes

Therefore, although the current heat pipe has the advantages of no need for control and reliable performance, it is not an ideal thermal switch. The breaking temperature depends on the filled body. When the temperature of the magnet is lower than the temperature of the first-stage cold head, the heat pipe cannot make the first-stage Effective thermally disconnected connection between the cold head and the secondary cold head

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