Two-stage expansion refrigerating unit
The present invention provides a two-stage expansion refrigerating unit capable of performing control at low cost to make the pressure of the refrigerant which passed through the expansion means on high pressure side to be an optimum pressure. The two-stage expansion refrigerating unit comprises con...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The present invention provides a two-stage expansion refrigerating unit capable of performing control at low cost to make the pressure of the refrigerant which passed through the expansion means on high pressure side to be an optimum pressure. The two-stage expansion refrigerating unit comprises control means (controller 50) which controls compressor 1 (compressing element 1A on low stage side and compressing element 1B on high stage side) as well as each expansion means (high pressure side expansion value 3 as high pressure side expansion means, and low pressure side expansion value 5 as low pressure side expansion means), and temperature sensor 52 (temperature detecting means) for detecting the temperature of the refrigerant which passed through the high pressure side expansion value 3, the controller 50 estimates the pressure P2 of the refrigerant which passed through the high pressure side expansion value 3 on the basis of the temperature detected by the temperature sensor 52 to control either the high pr |
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