Ejector

Abstract

A swirling space in which a refrigerant is swirled into a gas-liquid mixing state includes an upstream swirling space in which the refrigerant flowing from an external is swirled, and a downstream swirling space in which the refrigerant flowing from the upstream swirling space is introduced into a nozzle passage while swirling. Further, a cross-sectional shape of an outlet part of the upstream swirling space is formed into an annular shape along an outer peripheral shape of the upstream swirling space.

What is claimed is: 
     
         1 . An ejector comprising:
 a swirling space formation member having a swirling space in which a fluid is swirled;   a nozzle that depressurizes and ejects the fluid flowing out of the swirling space; and   a body including a fluid suction port that draws a fluid due to a suction action of the ejected fluid at high speed which is ejected from the nozzle, and a pressure increase part that mixes the ejected fluid with the suction fluid drawn from the fluid suction port and increases a pressure of the mixed fluid, wherein   the swirling space includes an upstream swirling space in which the fluid flowing from an external is swirled, and a downstream swirling space that introduces the fluid flowing out of the upstream swirling space into the nozzle with keeping the fluid swirling,   the upstream swirling space and the downstream swirling space have respective rotating body shapes in which center axes are disposed coaxially with each other,   the upstream swirling space has an outlet part through which the fluid outflow to the downstream swirling space, and the outlet part has an annular shape along an outer peripheral shape of the upstream swirling space in a cross sectional surface perpendicular to the center axis, and   the downstream swirling space has a circular shape in a cross sectional surface perpendicular to the center axis.   
     
     
         2 . An ejector for a vapor compression refrigeration cycle device, comprising:
 a body including a refrigerant inlet port, a swirling space in which a 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 is mixed with a suction refrigerant drawn from the suction passage; and   a passage formation member that includes at least a portion disposed inside the depressurizing space, and a portion disposed inside the pressurizing space, the passage formation member having a conical shape which increases in cross-sectional area in a direction away from the depressurizing space, wherein   a refrigerant passage provided between an inner peripheral surface of the body defining the depressurizing space and an outer peripheral surface of the passage formation member is a nozzle passage functioning as a nozzle that depressurizes and ejects the refrigerant flowing out of the swirling space,   a refrigerant passage provided between an inner peripheral surface of the body defining the pressurizing space and an outer peripheral surface of the passage formation member is a diffuser passage functioning as a diffuser that mixes and pressurizes the ejection refrigerant and the suction refrigerant,   the swirling space includes an upstream swirling space in which the refrigerant flowing from an external is swirled, and a downstream swirling space in which the refrigerant flowing out of the upstream swirling space is introduced into the nozzle passage with swirling,   the upstream swirling space and the downstream swirling space have respective rotating body shapes in which center axes are disposed coaxially with each other,   the upstream swirling space has an outlet part through which the refrigerant outflow to the downstream swirling space, and the outlet part has an annular shape along an outer peripheral shape of the upstream swirling space in a cross sectional surface perpendicular to the center axis, and   the downstream swirling space has a circular shape in a cross sectional surface perpendicular to the center axis.   
     
     
         3 . The ejector according to  claim 1 , further comprising a swirling promotion member that swirls the refrigerant in the upstream swirling space around the center axis, wherein
 the swirling promotion member includes a flow regulating plate, and the refrigerant adjacent to a center axis of the upstream swirling space flows radially outward along the flow regulating plate.   
     
     
         4 . The ejector according to  claim 1 , wherein
 the upstream swirling space has an annular shape in a cross sectional surface perpendicular to the center axis, and   the upstream swirling space is configured to allow the refrigerant having a velocity component in a direction of swirling around the center axis of the upstream swirling space to flow into the upstream swirling space.   
     
     
         5 . The ejector according to  claim 2 , further comprising a swirling promotion member that swirls the refrigerant in the upstream swirling space around the center axis, wherein
 the swirling promotion member includes a flow regulating plate, and the refrigerant adjacent to a center axis of the upstream swirling space flows radially outward along the flow regulating plate.   
     
     
         6 . The ejector according to  claim 2 , wherein
 the upstream swirling space has an annular shape in a cross sectional surface perpendicular to the center axis, and   the upstream swirling space is configured to allow the refrigerant having a velocity component in a direction of swirling around the center axis of the upstream swirling space to flow into the upstream swirling space.