| 摘要 |
PROBLEM TO BE SOLVED: To keep a closed state of other solenoid valves in a case of any one of solenoid valves in an opened state in a refrigerant cooling circuit comprising a plurality of refrigerant circulating passages formed by providing a plurality of evaporators and sharing a compressor, a radiator and a throttle part, and solenoid valves opening and closing the respective refrigerant circulating passages provided between the throttle part and each of the evaporators. SOLUTION: Orifices 13a, 13b and 13c for applying pressure resistance are provided in passages between each of the solenoid valves 12a, 12b and 12c and each of the evaporators 4a, 4b and 4c, respectively. When only the solenoid valve 12a is laid in the opened state, for example, the orifices 13b and 13c give pressure resistance into the passages in the passages having the solenoid valves 12b and 12c of the closed state. According to this, a pressure difference is caused between the inlet side and outlet side of the solenoid valves 12b and 12c of the closed state, and the closed state of the solenoid valves 12b and 12c is assisted by this pressure difference. Therefore, the closed state of the solenoid valves 12b and 12c can be kept. COPYRIGHT: (C)2006,JPO&NCIPI
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