Retractable magnetizing current lead device and method of same

A current lead and retractable technology, applied in the direction of superconducting magnets/coils, circuits, magnetic objects, etc., can solve the problems that the temperature of the cold screen cannot be lowered very low, the superconducting magnet cannot work normally, and the heat leakage is large.

Pending Publication Date: 2017-08-18
杭州图锐科技有限公司
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Problems solved by technology

[0004] The current lead method of copper and high-temperature superconducting lead wire has greatly reduced the heat leakage, but for the liquid-free superconducting magnet whose working environment temperature is only controlled by the refrigerator, when the magnetizing current of about 600 amperes When the copper rod of the current lead is

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  • Retractable magnetizing current lead device and method of same
  • Retractable magnetizing current lead device and method of same
  • Retractable magnetizing current lead device and method of same

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] Such as figure 1 As shown, a retractable magnetizing current lead device of the present invention includes a retractable normal lead segment 1 arranged in a liquid nitrogen chamber, a high temperature superconducting transition lead segment 2 thermally connected to a cold head 71, and a low temperature The superconducting coil lead-out line section 3 has three parts; the retractable normal lead line section 1 is connected to the high-temperature part; the high-temperature superconducting transition lead-in section 2 is connected to the low-temperature part; the low-temperature superconducting coil lead-out line section 3 is connected to the superconducting Conductor coil 8; the lower end of the retractable normal lead segment 1 and the upper end of the high-temperature superconducting transition lead segment 2 are plugged into the retra...

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Abstract

A retractable magnetizing current lead device and its use method, comprising a retractable normal lead segment (1) arranged in a liquid nitrogen chamber, a high temperature superconducting transition lead segment (2) thermally connected to a cold head (71) ), and the lead-out section of the low-temperature superconducting coil (3); ) is connected to the superconducting coil (8); the lower end of the retractable normal lead segment (1) is connected to the upper end of the high-temperature superconducting transition lead segment (2) by plugging, and a retractable electrical contact (20) is provided at the connection point, The lower end of the high-temperature superconducting transition lead segment (2) is welded to the low-temperature superconducting coil lead-out segment (3); the high-current conductive rod (10) and the high-temperature superconducting lead (24) together form a current path for the entire magnetizing lead; It has the characteristics of low conduction heat leakage, high sealing performance and convenient excitation operation.

Description

technical field [0001] The invention relates to a magnetizing current lead device for a superconducting magnet system, in particular to a retractable magnetizing current lead device and a use method thereof. 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 pulse tube refrigerators, when the cooling power of the first-stage cold head is 50K It is 35W,...

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Application Information

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IPC IPC(8): H01F13/00H01F6/04H01F6/06
CPCH01F6/04H01F6/065H01F13/003
Inventor 朱建明陈一炜俞道生叶卫峰
Owner 杭州图锐科技有限公司
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