| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling system control device for controlling the opening of an electric expansion valve in a refrigerating system to improve the reliability at starting a compressor and quicken the cooling while preventing too much feed of liquid refrigerant. SOLUTION: The compressor 1, a condenser 2, the electric expansion valve 3, an evaporator 4 and a pressure detecting means 10 constitute the refrigerating cycle. Temperatures at the outlet and the inlet of the evaporator are detected by an evaporator outlet temperature sensor 6 and an inlet temperature sensor 7. A degree of overheat is found from a difference between both temperatures. Pressure in the outlet of the evaporator is detected by a pressure detecting means 10. The opening of the electric expansion valve 3 is controlled when a refrigerating load is higher so that the degree of overheat exists in a preset range of the degree of overheat, to cool the chamber inside. When evaporating pressure detected by the pressure detecting means 10 exceeds preset evaporating pressure, the electric expansion valve 3 is controlled to be closed so that it does not exceed the preset evaporating pressure. COPYRIGHT: (C)2006,JPO&NCIPI
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