| 摘要 |
PURPOSE:To provide a refrigerator which can realize a super low temperature such as -150 deg.C and can preserve a living body or a body to be examined for a longer time period without using any target refrigerant of choloro fluoro carbon restriction or any liquid nitrogen. CONSTITUTION:A refrigerator is formed of a high temperature side refrigerant circuit 2 and a low temperature side refrigerant circuit 3, each constituting an independent refrigerant closed circuit to provide cooling effect by condensing and then vaporizing refrigerant which is discharged out of compressors 4 and 10. A heat exchanger 25 is formed of an evaporator 14 in the high temperature side refrigerant circuit 2 and a condenser 23 in the low temperature side refrigerant circuit 3. Further, non-azeotropic mixture refrigerant containing dicholoro fluoro methane, choloro difluoro methane, trifluoro methane, carbon tetravalent fluoride, methane and argon is sealed in the low temperature side refrigerant circuit 3. |
