Cooling System for Superconducting Power Apparatus

Abstract

A cooling system for a superconducting power apparatus including a reservoir tank for reserving a liquefied gas, a circulating pump, a heat exchanger for cooling the liquefied gas, and a circulation loop through which the liquefied gas is circulated, the superconducting power apparatus being cooled by circulating the liquefied gas in a subcooled state using the circulating pump. The cooling system further includes a pressurizing mechanism for pressurizing the liquefied gas in the reservoir tank with the same type of gas as the liquefied gas, wherein a liquid level in the reservoir tank for reserving the liquefied gas in a pressurized state is located above an outlet of a return piping of a circulating liquefied gas at least by a dissolving depth of the pressurizing gas+(plus) a liquid level movement correction amount.

1 . A cooling system for a superconducting power apparatus comprising: a reservoir tank for reserving a liquefied gas; a circulating pump; a heat exchanger for cooling the liquefied gas; a circulation loop through which the liquefied gas is circulated, in which the superconducting power apparatus is cooled by circulating the liquefied gas in a subcooled state using the circulating pump; and
 further comprising pressurizing means for pressurizing the liquefied gas in the reservoir tank with the same type of gas as the liquefied gas, wherein a liquid level in the reservoir tank for reserving the liquefied gas in a pressurized state is located above an outlet of a return piping of a circulating liquefied nitrogen gas at least by a dissolving depth of the pressurizing gas+(plus) a liquid level movement correction amount.   
   
   
       2 . The cooling system for the superconducting power apparatus according to  claim 1 , wherein the pressurizing means for pressurizing the liquefied gas in the reservoir tank with the same type of gas as the liquefied gas performs pressurization at a predetermined pressure through a pressure regulating valve from a gas cylinder reserving the same type of gas as the liquefied gas at a high pressure. 
   
   
       3 . The cooling system for the superconducting power apparatus according to  claim 1 , wherein the pressurizing means for pressurizing the liquefied gas in the reservoir tank with the same type of gas as the liquefied gas comprising:
 a piping, which is branched from a piping from an outlet of the circulating pump to the superconducting power apparatus, and returns to the reservoir tank; and   therefore using a discharge pressure of the circulating pump which pumps out the liquefied gas in the subcooled state from the reservoir tank.   
   
   
       4 . The cooling system for the superconducting power apparatus according to  claim 3 , wherein the pressurizing means for pressurizing the liquefied gas in the reservoir tank with the same type of gas as the liquefied gas comprising:
 an evaporator for evaporating the liquefied gas; and   a pressure regulating valve for regulating the pressure of the gas, wherein the evaporator and the pressure regulating valve are provided at the piping which is branched from a piping from an outlet of the circulating pump pumping out the liquefied gas in the subcooled state from the reservoir tank to the superconducting power apparatus, and returns to the reservoir tank.   
   
   
       5 . The cooling system for the superconducting power apparatus according to  claim 3 , wherein auxiliary means for the pressurizing means is further provided so that the same type of gas as the liquefied gas is supplied from a gas cylinder for the pressurization. 
   
   
       6 . The cooling system for the superconducting power apparatus according to  claim 1 , wherein the auxiliary means for the pressurizing is further provided and the auxiliary means has a heating device arranged at a gas phase portion of the reservoir tank so as to heat and expand a volume of the gas at the phase portion in the reservoir tank. 
   
   
       7 . The cooling system for the superconducting power apparatus according to  claim 4 , wherein auxiliary means for the pressurizing means is further provided so that the same type of gas as the liquefied gas is supplied from a gas cylinder for the pressurization. 
   
   
       8 . The cooling system for the superconducting power apparatus according to  claim 2 , wherein the auxiliary means for the pressurizing is further provided and the auxiliary means has a heating device arranged at a gas phase portion of the reservoir tank so as to heat and expand a volume of the gas at the phase portion in the reservoir tank. 
   
   
       9 . The cooling system for the superconducting power apparatus according to  claim 3 , wherein the auxiliary means for the pressurizing is further provided and the auxiliary means has a heating device arranged at a gas phase portion of the reservoir tank so as to heat and expand a volume of the gas at the phase portion in the reservoir tank. 
   
   
       10 . The cooling system for the superconducting power apparatus according to  claim 4 , wherein the auxiliary means for the pressurizing is further provided and the auxiliary means has a heating device arranged at a gas phase portion of the reservoir tank so as to heat and expand a volume of the gas at the phase portion in the reservoir tank. 
   
   
       11 . The cooling system for the superconducting power apparatus according to  claim 5 , wherein the auxiliary means for the pressurizing is further provided and the auxiliary means has a heating device arranged at a gas phase portion of the reservoir tank so as to heat and expand a volume of the gas at the phase portion in the reservoir tank. 
   
   
       12 . The cooling system for the superconducting power apparatus according to  claim 7 , wherein the auxiliary means for the pressurizing is further provided and the auxiliary means has a heating device arranged at a gas phase portion of the reservoir tank so as to heat and expand a volume of the gas at the phase portion in the reservoir tank.