| 摘要 |
PROBLEM TO BE SOLVED: To provide a freezer which automatically eliminates the clogging of an expansion mechanism. SOLUTION: A bypass pipe 18 for a hot gas is branched from the side of a discharge opening of a compressor 11, connected in the vicinity of an exit of an expansion valve 13, and provided with a solenoid valve 19 in the midway. A temperature sensor 21 which detects an evaporation temperature of a refrigerant is provided in the vicinity of an entrance of an evaporator 14, and is connected to the side of an input of a control device 20 which controls opening/closing of the solenoid valve 19. The evaporation temperature of the refrigerant is detected during cooling operation, and, when the detected temperature is not higher than a predetermined temperature, it is determined that the expansion valve 13 is clogging up, and then the solenoid valve 19 is opened for a predetermined time. Thus, the hot gas discharged from the compressor 11 passes through the bypass pipe 18 to the side of the exit of the expansion valve 13 so that the expansion valve 13 is heated. As a result of this, the contamination accumulated in the expansion valve 13, especially, deposited and appearing in a lower temperature part is redissolved in the refrigerant or the like to remove such clogging. COPYRIGHT: (C)2006,JPO&NCIPI
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