| 摘要 |
A first check valve 620 for allowing refrigerant to flow only from a compressor 100 to an evaporator 300 (a refrigerant passage 510) is provided in a hot-gas passage 600 that conducts refrigerant discharged from the compressor 100 into the evaporator 300 without passing through a radiator 200 and an ejector 400. Therefore, the refrigerant can be prevented from flowing into the hot-gas passage 600 during normal operation. In normal operation, the refrigerant in the hot gas passage 600 from the low pressure side (on the side of the evaporator 300) can be prevented from being retained in the hot-gas passage 600, so that the required amount of refrigerant can be reduced and the cost of producing the ejector circuit can be also reduced.
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