Liquid ejector and ejector refrigeration cycle

A liquid ejector for a vapor compression refrigeration cycle device including a compressor that compresses and discharges a refrigerant and a radiator that radiates a heat of the refrigerant, the liquid ejector comprising:

• an inflow passage forming portion that has a cylindrical shape and includes an inflow refrigerant passage into which the refrigerant flows from an outside;
• and
• a liquid ejection body portion that includes a gas-liquid mixing portion that mixes the refrigerant ejected from an ejection refrigerant passage with the refrigerant flowing from the inflow refrigerant passage, wherein
• the ejection refrigerant passage includes a first refrigerant inflow port into which the refrigerant that has radiated the heat in the radiator flows, and a refrigerant ejection port that ejects the refrigerant into the gas-liquid mixing portion, the ejection refrigerant passage has a passage cross-sectional area that continuously decreases in an axial direction of the inflow passage forming portion from the first refrigerant inflow port to the refrigerant ejection port,
• the inflow refrigerant passage includes a second refrigerant inflow port into which the refrigerant discharged from the compressor flows, and a refrigerant outflow port from which the refrigerant flows out to the gas-liquid mixing portion,
• the refrigerant ejection port has an annular shape in a cross-section perpendicular to the axial direction of the inflow passage forming portion,
• the refrigerant outflow port is disposed on an inner circumferential side of the refrigerant ejection port, and
• upon the refrigerant being ejected into the gas-liquid mixing portion, the refrigerant is ejected on an outer circumferential side of the refrigerant flowing into the gas-liquid mixing portion.