A closed liquid nitrogen self-circulation rapid cooling system

Abstract

The invention provides a closed liquid nitrogen self-circulation rapid cooling system. The closed liquid nitrogen self-circulation rapid cooling system comprises a liquid nitrogen tank, a pressure relief valve, an external cooling device, a liquid nitrogen pump, a low temperature insulating material connecting block, an electromagnetic coil and an energizing electrode, wherein the liquid nitrogen tank is closed and is filled with liquid nitrogen; the pressure relief valve and the external cooling device are arranged on the liquid nitrogen tank; the liquid nitrogen pump and the low temperature insulating material connecting block are arranged in the liquid nitrogen tank; the electromagnetic coil is arranged at one end of the low temperature insulating material connecting block; a central through hole is formed in the center of an electromagnetic lead in the electromagnetic coil; the central through hole of the electromagnetic lead is correspondingly connected with a central through hole of the low temperature insulating material connecting block; the energizing electrode is arranged on the electromagnetic coil. According to the closed liquid nitrogen self-circulation rapid cooling system provided by the invention, a mode of combining direct contact between liquid nitrogen and the electromagnetic lead for heat exchange with forced-convection heat transfer is adopted, and external heat dissipation and internal heat dissipation of the electromagnetic coil are simultaneously performed, so that the heat dissipating effect of the electromagnetic lead is greatly improved; meanwhile, the phenomenon that internal stress of the electromagnetic lead is changed due to the fact that liquid nitrogen flows through the central through hole of the electromagnetic lead can be prevented, and the service life of the electromagnetic lead is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of rapid cooling, and in particular relates to a closed 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 t...

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Problems solved by technology

However, since liquid nitrogen is easily vaporized under atmospheric pressure, when liquid nitrogen flows in from the inlet end of the central through hole of the electromagnetic wire and flows out from the outlet end of the central through hole of the electromagnetic wire, it is easy to produce a phase change, and the liquid nitrogen phase change process will cause The internal stress of the electromagnetic wire changes. With the extension of the working time of the electromagnetic wire, the strength of the electromagnetic wire itself will become weaker. In severe cases, the electromagnetic wire will be broken, thereby shortening the service life of the electromagnetic wire.

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