| 摘要 |
PROBLEM TO BE SOLVED: To obtain optimum operations under the condition of vacuum pressure<output pressure of an ejector and under the condition of vacuum pressure>output pressure of the ejector in a refrigeration cycle including the ejector.SOLUTION: Refrigerant flows out of a compressor 1 into an evaporator 5 via a condenser 2, a heat exchanger 3 (a primary-side path 3a), and first decompression means 4. A part of the refrigerant branches off from a downstream side of the primary-side path 3a of the heat exchanger 3 and acts as a drive flow for an ejector 7 via second decompression means 6 and a secondary-side path 3b of the heat exchanger 3. The ejector 7 vacuums the refrigerant from the evaporator 5 by the drive flow and supplies the refrigerant to the compressor 1. In a course of this supply, a bypass path 8 for supplying the refrigerant from the evaporator 5 to the compressor 1 while bypassing the ejector 7 and opening/closing means (a check valve) 9 for opening or closing the bypass path 8 in response to a vacuum pressure and an output pressure of the ejector 7 are provided. |
