SUPERCONDUCTING APPARATUS

• Main Author: MORI HIDEAKI
• Format: Patent
• Language: English
• Published: 06.12.1988
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INDUCTANCES; MAGNETS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

PURPOSE:To efficiently convect liquid nitrogen, to make the whole temperature distribution uniform, to prevent the liquid nitrogen from solidifying near a solidifying point and particularly to prevent solid nitrogen from adhering to the surface of a cooling heat exchanger by dividing the heat exchanger of the nitrogen for dipping and cooling a superconducting device into upper and lower sets, and reducing the temperature of the upper exchanger lower than that of the lower exchanger. CONSTITUTION:Liquid nitrogen having 1 atm of pressure and 77.5 (Kelvin) of temperature is poured through a pouring tube 11 to a liquid nitrogen vessel 5. V1 and V2 are opened at this time. When the nitrogen is filled in the vessel 5, the V1 and V2 are closed, a refrigerator 10 is operated, valves V1-V3 are suitably regulated to always reduce the temperature of a heat exchanger 1a lower than that of a heat exchanger 1b, thereby reducing the temperature of the liquid nitrogen 2. Then, a spontaneous convection circulated between the inside and the outside of a partition plate is generated, and the temperature of the nitrogen is maintained substantially uniformly. Thus, even if the temperature becomes near a solidifying point, since the liquid is fluidized, it is scarcely solidified particularly to prevent solid nitrogen from adhering to the exchanger 1a.