| 摘要 |
A tapered portion (131) having a passage cross-sectional area that decreases gradually toward a minimum passage area portion (30m), and a divergent portion (132) which is formed on the downstream side, in the refrigerant flow direction, of the minimum passage area portion and which has a passage cross-sectional area that increases gradually, are formed in a nozzle passage (13a) functioning as a nozzle for injecting a refrigerant, wherein the degree of increase in the passage area of the divergent portion increases gradually toward the downstream side in the refrigerant flow direction. Additionally, the shape of a most downstream portion of a suction passage (13b) is configured such that the passage cross-sectional area thereof is constant. This configuration allows particles (droplets) of liquid-phase refrigerant in the injected refrigerant to broaden readily on an outer peripheral side of a passage-forming member (35), suppresses inhibition of broadening of the injected refrigerant by the sucked-in refrigerant, and suppresses a deterioration in the mixing performance between the droplets and gas-phase refrigerant. The configuration also makes it possible for a reduction in the ejector efficiency to be adequately suppressed even if the speed of flow of the injected refrigerant decreases. |
