| 摘要 |
A refrigeration system including a compressor, a condenser, an expansion device and an evaporator connected in a closed circuit through which a refrigerant is circulated. Liquid refrigerant is injected between an outlet of the compressor and an inlet of the condenser using a vacuum generator in which the vacuum is created by the geometry of the device and the dynamic properties of fluid flow therein, thereby allowing the refrigerant to be cooled at a temperature close to its saturation temperature when it enters the condenser without the need for a costly pump having moving parts. The vacuum may be produced by vortex flow of the superheated vapor output of the compressor, by flow of the superheated vapor through the throat of a venturi device, or in any other comparable manner. The refrigeration system may employ a single refrigerant or a mixture of refrigerants such as R-134a, R-32 and R-125.
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