| 摘要 |
A refrigerating system comprises a compressor, a condenser, an expansion valve, an evaporator, sensors for detecting respectively a temperature and a pressure of a refrigerant sucked into the compressor, and a pressure of a refrigerant discharged from the compressor, a liquid injection system including an injection passage and a flow control valve connected in the injection passage, and a control means for estimating a temperature of gas refrigerant discharged from the compressor, from detected values delivered from the sensors, and for delivering an instruction for controlling the injection quantity of the liquid refrigerant, depending upon the estimated temperature, to the flow regulating valve, thereby it is possible to control a temperature of the discharged gas from the compressor to a set value, irrespective of an operating condition.
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