| 摘要 |
PROBLEM TO BE SOLVED: To prevent the abnormal increase of the high pressure of a compressor due to insufficiency in condensing capacity of a cooler during defrosting operation. SOLUTION: A cooling pipe 42 of a condenser 18 comprises a first cooling pipe 44 fronting on a first condensing part 18a on the compressor side; and a second cooling pipe 46 fronting on a second condensing part 18b on the cooler side. A check valve 26 for cooling and an expansion valve 30 for defrosting are connected in parallel to a connection pipe 48 connected to the middle of the cooling pipe 42. During cooling operation, refrigerant fed to the condenser 8 through a first refrigerant pipe 16 during cooling operation flows through a route consisting of, in order, the first cooling pipe 44 of the condenser 18, the check valve 26 for cooling the connection pipe 48, the second cooling pipe 46 for the condenser 18, and a second refrigerating pipe 20. A refrigerant fed to the condenser 18 through the second refrigerant pipe 20 during defrosting flows through a route consisting of, in order, the second cooling pipe 46 of the condenser 18, the expansion valve 30 for defrosting the connection pipe 48, the first cooling pipe 44 for the condenser 18, and the refrigerant pipe 16.
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