| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigerator optimum for using a cooling medium with the state varied at a super-critical region at a high pressure side of a refrigeration cycle and not liquefied. SOLUTION: The refrigerator is provided with a compressor (16) provided with a primary compression mechanism for compressing the cooling medium from a flowing-in port (16d) at a first stage and delivering it from a delivery port (16a) at the first stage and a secondary compression mechanism for compressing the cooling medium from a flowing-in port (16b) at a second stage and delivering it from the delivery port at the second stage. The refrigerator is provided with a refrigeration cycle at the first stage starting from a delivery port at the first stage and returning the flowing-in port at the second stage through a primary air-cooling heat exchange part (17a); a refrigeration cycle at the second stage starting from the delivery port and returning to the flowing-in port at the first stage through a secondary air-cooling heat exchange part (17b), pressure reduction devices (22, 23) and a cooling unit (24); and a bedewing prevention pipe (19) for preventing bedewing on an opening of the heat insulation box (1). Further, a drain evaporation pipe (26) is provided at a downstream of the delivery port at the first stage. COPYRIGHT: (C)2004,JPO
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