EJECTOR

摘要

In an ejector, formed in a body is a swirling space which lets a high-pressure refrigerant flowing from a refrigerant inlet port swirl and introduces the swirling high-pressure refrigerant into a depressurizing space in which the swirled high-pressure refrigerant is depressurized and expanded. A passage formation member that defines a nozzle passage and a diffuser passage is shaped to have a cross-sectional area increasing with distance from the depressurizing space. Further, a temperature sensing unit of a drive device that displaces the passage formation member is housed in the body, and the temperature sensing unit and a diaphragm have annular shapes to surround at least the axial line of the passage formation member.

主权项

1. An ejector for a vapor compression refrigeration cycle, comprising:
a body including a refrigerant inlet port through which a refrigerant is introduced, a swirling space in which the refrigerant flowing from the refrigerant inlet port is swirled, a depressurizing space in which the refrigerant flowing out of the swirling space is depressurized, a suction passage that communicates with a downstream side of the depressurizing space in a refrigerant flow and draws a refrigerant from an external, and a pressurizing space in which an ejection refrigerant ejected from the depressurizing space and a suction refrigerant drawn through the suction passage are mixed with each other and pressurized; a passage formation member which is arranged at least in the depressurizing space and the pressurizing space and has a shape that increases in cross-sectional area with distance from the depressurizing space; and a drive device that displaces the passage formation member, wherein the depressurizing space has a nozzle passage, which functions as a nozzle that depressurizes and ejects the refrigerant that has flowed out of the swirling space, between an inner peripheral surface of the body and an outer peripheral surface of the passage formation member, the pressurizing space has a diffuser passage, which functions as a diffuser that mixes and pressurizes the ejection refrigerant and the suction refrigerant together, between the inner peripheral surface of the body and the outer peripheral surface of the passage formation member, the drive device includes a temperature sensing unit in which a temperature sensitive medium that changes in pressure according to temperature change is sealed, and a pressure responsive member that is displaced according to a pressure of the temperature sensitive medium in the temperature sensing unit, the drive device is housed in the body in a state where a heat of the suction refrigerant in the suction passage is transferred to the temperature sensitive medium in the temperature sensing unit through the temperature sensing unit, and the temperature sensing unit and the pressure responsive member each have an annular shape surrounding an axial line of the passage formation member.