| 摘要 |
PROBLEM TO BE SOLVED: To improve cooling capability by receiving a signal for detecting a temperature of a refrigerant by a calculating means, calculating an optimum pressure, inputting the calculated signal to an expansion ratio control means, changing a refrigerant supply amount to an expansion device and controlling a refrigerant pressure to a predetermined pressure. SOLUTION: A refrigerant compressed by a compressor 1 driven by a prime mover 12 is cooled by a radiator 3, and then a main shaft 11 is driven in the case of passing an expansion device 4 mounting an expansion ratio control means 10. Then, a temperature sensor 7 and a pressure sensor 8 are mounted between the device 4 and the radiator 3, and a refrigerant state of the output side of the radiator 3 is detected by the sensor 7 and the sensor 8. The detected signal is received by a calculating means 9, which calculates an optimum pressure, the calculated signal is altered to a refrigerant supply amount to the device 4 by the means 10, and a pressure of the refrigerant is controlled to a predetermined pressure.
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