High-temperature superconducting current lead with section capable of being pulled out and using externally supplied liquid nitrogen to cool

Abstract

The invention discloses a high-temperature superconducting current lead with a section capable of being pulled out and using externally supplied liquid nitrogen to cool. The high-temperature superconducting current lead with the section capable of being pulled out and using the externally supplied liquid nitrogen to cool comprises a fixed high-temperature superconducting section and a drawable type ordinary conducting section, wherein the fixed high-temperature superconducting section and the drawable type ordinary conducting section are connected through a clamping connector, and the lower end of the fixed high-temperature superconducting section can also be connected with a backup clamping type connector. When the fixed high-temperature superconducting section is damaged, a backup current lead is directly inserted into a lower connector in a connecting mode so as to excite a magnet. Liquid nitrogen is blown into the drawable type ordinary conducting section after the lower end of the drawable type ordinary conducting section is connected with the fixed high-temperature superconducting section, a thermal insulating layer is arranged between an inner cooling channel and an outer cooling channel of the drawable type ordinary conducting section, and a power source connector is arranged at the upper end of the drawable type ordinary conducting section, the backup current lead penetrates through the fixed high-temperature superconducting section, and is connected on the backup clamping type connector in a clamping mode, cold helium is blown into the lower end of the backup current lead to carry out cooling, a cooling channel is further formed inside the backup current lead, a helium collecting pipe which is communicated with the cooling channel is arranged on the upper portion of the cooling channel, and an electric connector is arranged at the upper end of the helium collecting pipe.

Description

technical field [0001] The invention relates to the feeding and cooling technology of a medical magnetic resonance imaging superconducting magnet system, in particular to a high-temperature superconducting current lead that reduces the consumption of liquid helium during the excitation process of a magnetic resonance superconducting magnet and adopts external liquid nitrogen to cool the extractable section . Background technique [0002] Superconducting magnetic resonance imager has been very popular in large and medium-sized hospitals at home and abroad. It is the equipment for human medical examination. It can provide clear images of human soft tissue sections and is very effective for diagnosing internal organs and brain lesions. Most of the existing superconducting magnets are excited once after the magnet thermostat is filled with liquid helium, and then the magnet is operated under a continuous current by means of the closing of the superconducting switch, after which ...

AI Technical Summary

Problems solved by technology

Three technical problems to be solved by the present invention: use high-temperature superconducting section to reduce the consumption of liquid helium to zero evaporation during excitation; rely on externally supplied liquid nitrogen and do not rely on the constant conduction section cooled by the primary cold head of the refrigerator; add backup conventional current The leads and their joints are used as a backup in case of damage to the high-temperature superconducting section

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