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Ejector

a technology of ejector and nozzle, which is applied in the direction of machines/engines, subcoolers, lighting and heating apparatus, etc., can solve the problems the boiling delay of partial liquid-phase refrigerant, and the inability to improve the efficiency of the nozzle to a desired value, so as to achieve the effect of reducing the efficiency of the nozzle of the ejector

Inactive Publication Date: 2016-03-31
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent aims to improve the efficiency of an ejector by preventing a reduction in the nozzle efficiency of the ejector when depressurizing a fluid swirled into a gas-liquid mixing state. The technical effect of this patent is to promote boiling of the liquid-phase fluid in the nozzle and limit a reduction in energy conversion efficiency when converting pressure energy into velocity energy in the nozzle passage of the ejector.

Problems solved by technology

However, there is a case in which the nozzle efficiency cannot be improved to a desired value depending on an operation condition.
When the depressurization and boiling of the refrigerant within the swirling space is limited, a ratio of the gas-phase refrigerant to the refrigerant in the gas-liquid mixing state which flows into the minimum passage area part decreases to reduce boiling nucleus for promoting the boiling of the liquid-phase refrigerant, resulting in a boiling delay of partial liquid-phase refrigerant.
As a result, the refrigerant ejected from the minimum passage area part cannot be effectively accelerated, which may cause the nozzle efficiency to be reduced.

Method used

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Experimental program
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first embodiment

[0040]A first embodiment of the present disclosure will be described with reference to FIGS. 1 to 5. As illustrated in an overall configuration diagram of FIG. 1, an ejector 13 according to this embodiment is applied to a refrigeration cycle device having an ejector as a refrigerant depressurizing device, that is, an ejector refrigeration cycle 10. Moreover, the ejector refrigeration cycle 10 is applied to a vehicle air conditioning apparatus, and performs a function of cooling a blast air which is blown into a vehicle interior that is a space to be air-conditioned.

[0041]In addition, an HFC-based refrigerant (more specifically, R134a) is applied as the refrigerant in the ejector refrigeration cycle 10, and a vapor compression type subcritical refrigeration cycle in which high pressure-side refrigerant pressure does not exceed critical pressure of the refrigerant is configured. It is needless to say that an HFO-based refrigerant (for example, R1234yf) may be employed as the refrigera...

second embodiment

[0126]In the first embodiment, the example in which the swirling flow of the refrigerant is generated in the interior of the upstream swirling space 301 is described. In this embodiment, a description will be given of an example in which, as illustrated in FIGS. 6 to 8, with the application of a swirling promotion member 39, a swirling flow of the refrigerant is generated in the outer peripheral side of the upstream swirling space 301, and the refrigerant having a velocity component in the swirling direction flows into the upstream swirling space 301. FIGS. 6 to 8 correspond to FIGS. 2 to 4 in the first embodiment, respectively, and the same or equivalent parts to those in the first embodiment are denoted by identical symbols.

[0127]Specifically, a swirling promotion member 39 according to this embodiment includes a plate 39a formed into a disc shape, multiple flow regulating plates 39b projected downward from an outer peripheral part of the plate 39a, and a cylindrical protruding po...

third embodiment

[0139]In the ejector refrigeration cycle 10a of this embodiment, as illustrated in an overall configuration diagram of FIG. 9, the ejector 13 according to the first embodiment is replaced with an ejector 53 and a gas-liquid separator 60.

[0140]The ejector 53 according to this embodiment does not have a function of the gas-liquid separator, but as in the ejector 13 of the first embodiment, performs a function of a refrigerant depressurizing device and also performs a function of a refrigerant circulation device (refrigerant transport device). A specific configuration of the ejector 53 will be described with reference to FIG. 10.

[0141]The ejector 53 has a nozzle 531 and a body 532 as illustrated in FIG. 10. First, the nozzle 531 is made of metal (for example, stainless alloy) shaped into substantially a hollow cylinder gradually tapered toward a flowing direction of the refrigerant, and the refrigerant flowing into the nozzle 531 is isentropically depressurized, and ejected from a refr...

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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.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on and incorporates herein by reference Japanese Patent Application No. 2013-103141 filed on May 15, 2013.TECHNICAL FIELD[0002]The present disclosure relates to an ejector that depressurizes a fluid, and draws the fluid by a suction action of an ejection fluid at high speed.BACKGROUND ART[0003]Up to now, Patent Document 1 discloses a depressurizing device that is applied to a vapor compression refrigeration cycle device, and depressurizes the refrigerant.[0004]The depressurizing device of Patent Document 1 has a main body that defines a swirling space in which the refrigerant is swirled, and swirls the refrigerant within the swirling space, to thereby reduce a refrigerant pressure on a swirling center side to a pressure at which the refrigerant is depressurized and boiled (cavitation occurs). Further, the depressurizing device allows the refrigerant in a gas-liquid mixing state in which a gas-phase refrigerant and...

Claims

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Application Information

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IPC IPC(8): F04F5/44F25B41/00F25B41/06
CPCF04F5/44F25B41/00F25B2341/06F25B2341/0012F25B2341/001F25B41/062F04F5/04F25B27/00F25B40/02F25B2327/001F25B2400/23F25B2500/18F04F5/46F25B2600/0253B60H2001/3298F25B41/335
Inventor YAMADA, ETSUHISATAKANO, YOSHIAKINISHIJIMA, HARUYUKI
Owner DENSO CORP
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