Patent ID: 7997089
Filing Date: 2011-08-16
Classification: F04B,Y10S

Abstract:
1. A water regeneration method for discharging ice condensed in a portion cooled by a cryogenic refrigerator installed in a case to an outside of the case, comprising: a temperature increasing step for melting the ice into water at approximately atmospheric pressure and at a melting temperature of at least 273 K; a vaporizing step for vaporizing water by performing a plurality of first roughing steps between the approximate atmospheric pressure and a first reduced pressure being less than the atmospheric pressure but higher than and yet close to a water-freezing pressure that causes the water to freeze; a water discharge step for discharging water by performing a plurality of second roughing steps between a second reduced pressure and the first reduced pressure, the second reduced pressure being less than the atmospheric pressure and greater than the first reduced pressure; and a water vapor discharging step for discharging water vapor by performing a plurality of third roughing steps between a third reduced pressure and a fourth reduced pressure, the third and fourth reduced pressures being less than the first reduced pressure and the third reduced pressure being greater than the fourth reduced pressure, wherein each one of the vaporizing step, the water discharge step and the water vapor discharging step occurs at the melting temperature of at least 273 K.