Ejector

Patent metadata

Field	Value
Publication number	US-11053956-B2
Application number	US-201716073824-A
Country	US
Kind code	B2
Filing date	Jan 24, 2017
Priority date	Feb 2, 2016
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

An ejector includes a body including an inflow space into which a refrigerant flows, a passage formation member disposed inside the body and having a conical shape, and a nozzle passage having an annular cross section which functions as a nozzle and a diffuser passage having an annular cross section which functions as a pressure increase portion, the nozzle passage and the diffuser passage being disposed between an inner wall surface of the body and a conical lateral surface of the passage formation member. A drive mechanism that displaces the passage formation member in a direction along a center axis is coupled to an upstream actuating bar which extends from the passage formation member toward the inflow space and is slidably supported by the body. Center axes of the passage formation member, the upstream actuating bar and the inflow space are coaxial with each other.

First claim

The invention claimed is:

1. An ejector applied to a vapor-compression refrigeration cycle device, the ejector comprising: a body including an inflow space configured to allow a liquid-phase refrigerant to flow thereinto, a pressure reducing space configured to reduce a pressure of the refrigerant that has flowed out of the inflow space, a suction passage drawing a suction refrigerant from a refrigerant suction port, and a pressurizing space configured to introduce therein a jet refrigerant jetted from the pressure reducing space and the suction refrigerant drawn through the suction passage; a passage formation member at least partially disposed inside the pressure reducing space, the passage formation member and the body defining a refrigerant passage therebetween; and a diaphragm configured to displace the passage formation member, wherein the refrigerant passage includes a nozzle passage defined between an inner peripheral surface of the pressure reducing space and an outer peripheral surface of the passage formation member, the nozzle passage functioning as a nozzle which reduces the pressure of the refrigerant and jets the refrigerant, the passage formation member is coupled to an actuating bar having an upstream end that extends through the inflow space and is slidably supported by the body, a center axis of the inflow space, a center axis of the upstream end of the actuating bar, and a center axis of the passage formation member are coaxially disposed, the passage formation member is at least partially disposed inside the pressurizing space, the refrigerant passage includes a diffuser passage defined between an inner peripheral surface of the pressurizing space and the outer peripheral surface of the passage formation member, the diffuser passage functioning as a pressure increase portion which mixes and pressurizes the jet refrigerant and the suction refrigerant, a suction refrigerant outlet of the suction passage has an annular opening that surrounds an outer circumference of a refrigerant ejection port of the nozzle passage, the refrigerant passage includes a mixing passage located upstream of the diffuser passage and defined between the inner peripheral surface of the pressurizing space and the outer peripheral surface of the passage formation member, the mixing passage mixing the jet refrigerant and the suction refrigerant together, and a smallest passage cross-sectional area in the mixing passage is smaller than a total of a passage cross-sectional area of the refrigerant ejection port and a passage cross-sectional area of the suction refrigerant outlet.

2. The ejector according to claim 1 , wherein
the passage formation member is coupled to a downstream end of the actuating bar that extends downstream of the diffuser passage and is slidably supported by the body.

3. The ejector according to claim 2 , wherein
the center axis of the upstream end of the actuating bar and a center axis of the downstream end of the actuating bar are coaxially disposed.

4. The ejector according to claim 2 , wherein
the diaphragm is coupled to the upstream end of the actuating bar.

5. The ejector according to claim 1 , wherein
an outline of a wall surface, defining the mixing passage in the body on a cross-sectional plane including the center axes of the passage formation member and the diaphragm, gradually comes closer to the passage formation member in a downstream direction of the refrigerant flow.

6. The ejector according to claim 1 , wherein
an outline of a wall surface, defining the mixing passage in the passage formation member on a cross-sectional plane including the center axes of the passage formation member and the diaphragm, gradually comes closer to the body in a downstream direction of the refrigerant flow.

7. The ejector according to claim 1 , wherein
an outline of a wall surface, defining the nozzle passage in the passage formation member on a cross-sectional plane including the center axes of the passage formation member and the diaphragm, includes a shape sharpened toward the nozzle passage.

8. The ejector according to claim 1 , wherein
the body includes a refrigerant inflow passage that introduces the refrigerant flowing from a refrigerant inflow port into the inflow space, and
the refrigerant inflow passage extends toward the center axis of the inflow space.

9. The ejector according to claim 1 , wherein
the passage formation member has a recess portion recessed in a direction to increase the passage cross-sectional area of the nozzle passage.

10. The ejector according to claim 9 , wherein
the recess portion is a through hole extending through a conical lateral surface of the passage formation member.

11. The ejector according to claim 9 , wherein
the recess portion is a groove portion provided over an entire circumference around the center axis of the passage formation member.

12. An ejector applied to a vapor-compression refrigeration cycle device, the ejector comprising: a body including an inflow space configured to allow a liquid-phase refrigerant to flow thereinto, a pressure reducing space configured to reduce a pressure of the refrigerant that has flowed out of the inflow space, a suction passage drawing a suction refrigerant from a refrigerant suction port, and a pressurizing space configured to introduce therein a jet refrigerant jetted from the pressure reducing space and the suction refrigerant drawn through the suction passage; a passage formation member at least partially disposed inside the pressure reducing space, the passage formation member and the body defining a refrigerant passage therebetween; and a motor configured to displace the passage formation member, wherein the refrigerant passage includes a nozzle passage defined between an inner peripheral surface of the pressure reducing space and an outer peripheral surface of the passage formation member, the nozzle passage functioning as a nozzle which reduces the pressure of the refrigerant and jets the refrigerant, the passage formation member is coupled to an actuating bar having an upstream end that extends through the inflow space and is slidably supported by the body, a center axis of the inflow space, a center axis of the upstream end of the actuating bar, and a center axis of the passage formation member are coaxially disposed, the passage formation member is at least partially disposed inside the pressurizing space, the refrigerant passage includes a diffuser passage defined between an inner peripheral surface of the pressurizing space and the outer peripheral surface of the passage formation member, the diffuser passage functioning as a pressure increase portion which mixes and pressurizes the jet refrigerant and the suction refrigerant, a suction refrigerant outlet of the suction passage has an annular opening that surrounds an outer circumference of a refrigerant ejection port of the nozzle passage, the refrigerant passage includes a mixing passage located upstream of the diffuser passage and defined between the inner peripheral surface of the pressurizing space and the outer peripheral surface of the passage formation member, the mixing passage mixing the jet refrigerant and the suction refrigerant together, and a smallest passage cross-sectional area in the mixing passage is smaller than a total of a passage cross-sectional area of the refrigerant ejection port and a passage cross-sectional area of the suction refrigerant outlet.

Assignees

• Denso Corp

Inventors

• Nishijima Haruyuki
• Takano Yoshiaki
• Yokoyama Yoshiyuki
• Oshitani Hiroshi
• Nagano Yohei
• NAKASHIMA Ryota

Classifications

• F04F5/461

  Adjustable nozzles · CPC title

• F04F5/48

  Control · CPC title

• F04F5/46

  Arrangements of nozzles · CPC title

• F04F5/20 Primary

  for evacuating · CPC title

• F04F5/04 Primary

  displacing elastic fluids · CPC title