An open liquid nitrogen self-circulation rapid cooling system

Abstract

The invention provides an open-type liquid-nitrogen self-circulation rapid cooling system. The system comprises a liquid nitrogen groove, a liquid nitrogen pump, a low temperature insulating material connecting block, a solenoid coil and an electrified electrode, wherein the liquid nitrogen groove is an open type and liquid nitrogen is filled in the liquid nitrogen groove; the liquid nitrogen pump is installed in the liquid nitrogen groove or outside the liquid nitrogen groove; the low temperature insulating material connecting block is installed in the liquid nitrogen groove and is completely dipped by the liquid nitrogen; the solenoid coil is installed on one end of the low temperature insulation material connecting block, a center through hole is arranged at a center of an electromagnetic conducting wire in the solenoid coil, and the central through hole of the electromagnetic conducting wire is correspondingly connected with a central through hole of the low temperature insulation material connecting block; and the electrified electrode is installed on the solenoid coil. The open-type liquid-nitrogen self-circulation rapid cooling system adopts a mode of combining liquid-nitrogen direct-contact electromagnetic conducting wire heat transfer and forced-convection heat transfer, and external heat dissipation and internal heat dissipation of the solenoid coil are simultaneously performed so that a heat dissipation effect of the electromagnetic conducting wire is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of rapid cooling, in particular to an open liquid nitrogen self-circulation rapid cooling system. Background technique [0002] At present, the electromagnetic coil usually adopts the cooling method of static oil cooling, that is, the coil sleeve is filled with fireproof oil, and the heat generated when the coil is energized is transmitted by the fireproof oil. The fireproof oil is in a static state in the coil sleeve, and the heat It completely relies on natural conduction, and reaches an equilibrium temperature of about 100°C after stable operation. Long-term operation at this temperature will shorten the life of the coil. [0003] In the field of scientific research and military applications, based on the need to generate a strong magnetic field, a pulsed high-power electromagnetic coil is often used. The power of each pulse is as high as several megawatts or even tens of megawatts. Most of this energy is...

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Problems solved by technology

[0002] At present, the electromagnetic coil usually adopts the cooling method of static oil cooling, that is, the coil sleeve is filled with fireproof oil, and the heat generated when the coil is energized is transmitted by the fireproof oil. The fireproof oil is in a static state in the coil sleeve, and the heat It completely relies on natural conduction, and reaches an equilibrium temperature of about 100°C after stable operation. Long-term operation at this temperature will shorten the life of the coil

[0003] In the field of scientific research and military applications, based on the need to generate a strong magnetic field, a pulsed high-power electromagnetic coil is often used. The power of each pulse is as high as several megawatts or even tens of megawatts. Most of this energy is converted into waste heat. The cooling method of oil cooling is not enough to quickly cool the electromagnetic coil. In order to ensure the normal use of the electromagnetic coil, it needs to be immersed in liquid nitrogen to reduce resistance and quickly dissipate heat. However, due to the insulating fiber layer on the outer layer of the wire, when a pulse power is applied , relying only on heat conduction and liquid nitrogen natural convection heat exchange, it generally takes tens of minutes to several hours to reduce the electromagnetic coil to the temperature of liquid nitrogen before the next power load can be performed, which greatly reduces the efficiency of equipment operation and is not conducive to Efficient operation of equipment

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