Ejector-type refrigeration cycle, and ejector

Patent metadata

Field	Value
Publication number	US-2016209094-A1
Application number	US-201414914573-A
Country	US
Kind code	A1
Filing date	Aug 21, 2014
Priority date	Aug 29, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

An ejector-type refrigeration cycle includes an upstream side gas-liquid separator that separates a refrigerant that has flowed out of a diffuser portion of an ejector into gas and liquid and allows the separated liquid-phase refrigerant to flow to an evaporator without storing the separated liquid-phase refrigerant, and a downstream side gas-liquid separator that separates the refrigerant flowing out of the upstream side gas-liquid separator into gas and liquid, stores the separated liquid-phase refrigerant, and allows the separated gas-phase refrigerant to flow out toward an inlet side of a compressor. The ejector-type refrigeration cycle includes a refrigerant oil bypass passage for introducing a refrigerator oil within the diffuser portion into the downstream side gas-liquid separator.

First claim

What is claimed is:

1 . An ejector-type refrigeration cycle comprising:
a compressor that compresses and discharges a refrigerant mixed with a refrigerator oil; a radiator that radiates a heat of the refrigerant discharged from the compressor; an ejector including a nozzle portion that depressurizes the refrigerant that has flowed out of the radiator, a refrigerant suction port through which a refrigerant is drawn due to a suction action of a high-speed ejection refrigerant which is ejected from the nozzle portion, and a pressure increase part that pressurizes a mixed refrigerant of the ejection refrigerant and a suction refrigerant drawn from the refrigerant suction part; an upstream side gas-liquid separation device that separates the refrigerant that has flowed out of the ejector into a liquid-phase refrigerant and a residual gas-liquid two-phase refrigerant, the upstream side gas-liquid separation device including a liquid-phase refrigerant outlet port from which the separated liquid-phase refrigerant flows out without being stored, and a mixed-phase refrigerant outlet port from which the residual gas-liquid two-phase refrigerant flows out; an evaporator that evaporates the liquid-phase refrigerant that has flowed out of the liquid-phase refrigerant outlet port, and allows the refrigerant to flow out toward the refrigerant suction port; a downstream side gas-liquid separation device that separates the gas-liquid two-phase refrigerant that has flowed out of the mixed-phase refrigerant outlet port into a gas-phase refrigerant and a liquid-phase refrigerant, stores the separated liquid-phase refrigerant, and allows the separated gas-phase refrigerant to flow out toward an inlet side of the compressor; and a refrigerator oil concentration adjusting device that adjusts a concentration of the refrigerator oil in the liquid-phase refrigerant that has flowed out of the liquid-phase refrigerant outlet port.

2 . The ejector-type refrigeration cycle according to claim 1 , wherein
the refrigerator oil concentration adjusting device includes a refrigerator oil bypass passage that introduces the refrigerator oil within the pressure increase part to a downstream side of the mixed-phase refrigerant outlet port.

3 . The ejector-type refrigeration cycle according to claim 1 , wherein
the upstream side gas-liquid separation device separates the refrigerant into gas and liquid due to an action of a centrifugal force of the refrigerant by swirling the refrigerant that has flowed into an internal space of the upstream side gas-liquid separation device, and the refrigerator oil concentration adjusting device is configured by a refrigerator oil bypass passage that introduces the refrigerator oil within the upstream side gas-liquid separation device toward a downstream side of the mixed-phase refrigerant outlet port.

4 . The ejector-type refrigeration cycle according to claim 1 , further comprising an internal heat exchange device that performs a heat exchange between the refrigerant that has flowed out of the radiator and the liquid-phase refrigerant stored in the downstream side gas-liquid separation device.

5 . The ejector-type refrigeration cycle according to claim 1 , wherein
the refrigerator oil concentration adjusting device adjusts the concentration of the refrigerator oil to set a cooling capacity of the evaporator for a fluid subjected to cooling at a desired capacity.

6 . An ejector for a vapor compression refrigeration cycle device in which a refrigerant mixed with a refrigerator oil is circulated, the ejector comprising:
a body including a depressurizing space in which the refrigerant 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 into which an ejection refrigerant ejected from the depressurizing space and a suction refrigerant drawn from the suction passage flow; and a passage formation member that is arranged at least inside the depressurizing space and the pressurizing space, and has a conical shape having a cross-sectional area that increases with distance from the depressurizing space, wherein the depressurizing space has a nozzle passage, which functions as a nozzle depressurizing and ejecting the refrigerant, 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 which converts a kinetic energy of a mixed refrigerant of the ejection refrigerant and the suction refrigerant into a pressure energy, between the inner peripheral surface of the body and the outer peripheral surface of the passage formation member, and the body further includes: an upstream side gas-liquid separation space that separates the refrigerant that has flowed out of the diffuser passage into gas and liquid, and allows the separated liquid-phase refrigerant to flow out to an external from the liquid-phase refrigerant outlet port without storing the separated liquid-phase refrigerant, and allows a residual gas-liquid two-phase refrigerant to flow out of the mixed-phase refrigerant outlet port; and a refrigerator oil bypass passage that adjusts a concentration of the refrigerator oil in the liquid-phase refrigerant flowing out of the liquid-phase refrigerant outlet port by introducing at least one of the refrigerator oil within the diffuser passage and the refrigerator oil within the upstream side gas-liquid separation space into a downstream side of the mixed-phase refrigerant outlet port.

7 . The ejector according to claim 6 , wherein
the body defines a downstream side gas-liquid separation space that separates the gas-liquid two-phase refrigerant flowing out of the mixed-phase refrigerant outlet port into a gas-phase refrigerant and a liquid-phase refrigerant, and stores the separated liquid-phase refrigerant.

8 . The ejector according to claim 7 , further comprising an internal heat exchange device that performs a heat exchange between the refrigerant flowing into the refrigerant inlet port and the liquid-phase refrigerant stored in the downstream side gas-liquid separation space.

Assignees

• Denso Corp

Inventors

• Yokoyama Yoshiyuki
• Yamada Etsuhisa
• Nishijima Haruyuki
• Takano Yoshiaki

Classifications

• F25B40/00

  Subcoolers, desuperheaters or superheaters · CPC title

• F25B40/06

  Superheaters · CPC title

• B60H2001/3298

  Ejector-type refrigerant circuits · CPC title

• F25B2341/0012

  Ejectors with the cooled primary flow at high pressure · CPC title

• F25B43/006

  Accumulators · CPC title