| 摘要 |
PURPOSE: A cryogenic freezing system using a binary cooling cycle is provided to prevent overload of a compressor and a condenser, thereby realizing a normal operation of a cryogenic freezing system. CONSTITUTION: A high stage cycle part(100) includes a compressor(110) compressing a refrigerant, a condenser(120) condensing the compressed refrigerant, an expansion valve(130) reducing a pressure of the condensed refrigerant, and an evaporator(140) executing heat exchange by the refrigerant supplied from the capillary. A low stage cycle part(200) includes a condenser exchanging heat with the evaporator of the high stage cycle in an intermediate heat exchanger. A bypass line(150) is installed to connect a rear end of the condenser and a front end of the compressor. A pressure sensor is installed in the bypass line for measuring a pressure. An opening and shutting element(154) opens and shuts the bypass line based on the sensed pressure.
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