| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a device for maintaining a normal refrigerating cycle by avoiding generation of dry snow in an expansion valve while using a low evaporation temperature, and preventing clogging of the expansion valve when using carbon dioxide, or mixed gas of carbon dioxide as a coolant. SOLUTION: In the refrigerating cycle, carbon dioxide, or its mixed gas is used as a coolant. A bypass pipe from a hot gas pipe carrying hot gas discharged from a refrigerator (compressor) is connected to a coolant inflow side of the expansion valve arranged in a primary side of a cooler (evaporator). When a low pressure is detected by a pressure detecting switch, a solenoid valve of the bypass pipe is opened, hot gas is sent into the expansion valve, and the dry snow in the expansion valve is melted. COPYRIGHT: (C)2008,JPO&INPIT
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