| 摘要 |
Disclosed is a refrigerant circuit for ice making machines and the like, the circuit comprising a freezing circuit in which a high-pressure and high-temperature vaporized refrigerant is fed from a compressor through a solenoid valve to a condenser, the refrigerant liquefied in the condenser is then fed to an expansion means, the refrigerant vaporized through the expansion means is further fed to an evaporator, and the vaporized refrigerant heated through heat exchange is fed back to the compressor; and a hot gas circuit which bypasses the high-pressure and high-temperature vaporized refrigerant fed from the compressor to the evaporator through a hot gas valve so as to achieve ice releasing and the like at the evaporator; the solenoid valve and the hot gas valve being designed to be let open and closed, respectively, during the freezing operation, and to be closed and let open, respectively, when the operation mode is switched to the ice releasing operation; wherein a pressure detecting means is interposed between the compressor and the solenoid valve so as to achieve control of opening and closing the solenoid valve during the ice releasing operation and the like by the pressure detecting means. In the thus constituted circuit, drop in the performance, and burning or damage of the compressor can successfully be prevented.
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