| 摘要 |
PROBLEM TO BE SOLVED: To improve, especially, a COP (coefficient of performance) of a refrigeration device which performs two-stage expansion type refrigeration cycles.SOLUTION: An air conditioner (10) includes a refrigerant circuit (20) which performs two-stage expansion type refrigeration cycles in which a gas refrigerant of intermediate pressure from a gas-liquid separator (26) is injected into a compressor (21). The refrigerant circuit (20) is provided with an ejector (25) including: a driving flow passage (25a) which decompresses and accelerates the refrigerant discharged from a heat exchanger (23, 28) as a radiator; a suction flow passage (25b) which sucks a part of the refrigerant discharged from the heat exchanger (23, 28) as an evaporator with a refrigerant flow of the driving flow passage (25a); and a jet flow passage (25c) which puts together and jets the refrigerant of the driving flow passage (25a) and the refrigerant of the suction flow passage (25b). |
