Ejector and ejector-type refrigeration cycle

Patent metadata

Field	Value
Publication number	US-10935051-B2
Application number	US-201615554249-A
Country	US
Kind code	B2
Filing date	Feb 26, 2016
Priority date	Mar 9, 2015
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

An ejector includes a nozzle, a body including a refrigerant suction port and a pressure increasing portion, a passage forming member inserted into the nozzle, and an actuation device moving the passage forming member. A nozzle passage includes a smallest passage cross-sectional area portion, a convergent portion, and a divergent portion. The passage forming member includes a tip portion which changes the passage cross-sectional area at the smallest passage cross-sectional area portion when the actuation device moves the passage forming member. A positive displacement amount is defined as an amount of a displacement of the passage forming member when the passage forming member is moved so as to increase the passage cross-sectional area at the smallest passage cross-sectional area portion. The tip portion has a shape in which an increase rate of the smallest passage cross-sectional area portion is increased according to an increase of the positive displacement amount.

First claim

The invention claimed is:

1. An ejector for a vapor-compression refrigeration cycle device, the ejector comprising:
a nozzle that ejects a refrigerant;
a swirl flow generation portion that generates a swirl flow about a center axis of the nozzle in the refrigerant flowing into the nozzle;
a body that includes
a refrigerant suction port, the refrigerant being drawn from an outside through the refrigerant suction port due to a drawing effect of the ejected refrigerant ejected from the nozzle, and
a pressure increasing portion in which the ejected refrigerant and the drawn refrigerant drawn through the refrigerant suction port are mixed, a pressure of the mixed refrigerant being increased in the pressure increasing portion;

a passage forming member that is inserted into a refrigerant passage defined in the nozzle; and
an actuation device that is a motor or a diaphragm moving the passage forming member, wherein
a nozzle passage is defined between an inner peripheral surface of the nozzle and an outer peripheral surface of the passage forming member, the nozzle passage being a refrigerant passage that decompresses the refrigerant,
the nozzle passage includes
a smallest passage cross-sectional area portion at which a cross-sectional area of the nozzle passage is at a minimum,
a convergent portion that is located upstream of the smallest passage cross-sectional area portion with respect to a refrigerant flow, the cross-sectional area of the nozzle passage in the convergent portion gradually decreasing toward the smallest passage cross-sectional area portion, and
a divergent portion that is located downstream of the smallest passage cross-sectional area portion with respect to the refrigerant flow, the cross-sectional area of the nozzle passage in the divergent portion gradually increasing from the smallest passage cross-sectional area portion,

the passage forming member includes a tip portion which changes the cross-sectional area of the nozzle passage at the smallest passage cross-sectional area portion when the actuation device moves the passage forming member,
a positive displacement amount is defined as an amount of a displacement of the passage forming member when the passage forming member is moved so as to increase the passage cross-sectional area at the smallest passage cross-sectional area portion,
the tip portion has a shape in which an increase rate of the passage cross-sectional area at the smallest passage cross-sectional area portion increases according to an increase of the positive displacement amount,
the tip portion includes
a conical portion that has a conical shape and includes a vertex of the tip portion,
a truncated conical portion that has a truncated conical shape and is directly connected to the conical portion, and
an apex angle of the conical portion is larger than an apex angle of the truncated conical portion,

the actuation device is configured to move the passage forming member to have a first state and a second state so that
the truncated conical portion overlaps with the smallest passage cross-sectional area portion in a direction perpendicular to an axial direction of the passage forming member during the first state of the passage forming member, and
the conical portion overlaps with the smallest passage cross-sectional area portion in the direction perpendicular to the axial direction during the second state of the passage forming member, and

when the passage forming member is moved to increase the passage cross-sectional area at the smallest passage cross-sectional area portion, the increase rate of the passage cross-sectional area during the second state of the passage forming member is greater than the increase rate of the passage cross-sectional area during the first state of the passage forming member.

2. The ejector according to claim 1 , wherein
the actuation device moves the passage forming member so as to increase a flow rate of the refrigerant flowing through the nozzle passage according to an increase of a thermal load of the refrigeration cycle device, and
the increase rate of the passage cross-sectional area at the smallest passage cross-sectional area portion is increased according to an increase of the flow rate.

3. An ejector refrigeration cycle comprising:
the ejector according to claim 1 ; and
a radiator that cools a high-pressure refrigerant discharged from a compressor compressing the refrigerant such that the high-pressure refrigerant becomes a subcooled liquid-phase refrigerant, wherein
the subcooled liquid-phase refrigerant flows into the swirl flow generation portion.

Assignees

• Denso Corp

Inventors

• Yokoyama Yoshiyuki
• Nishijima Haruyuki
• Takano Yoshiaki

Classifications

• F04F5/461 Primary

  Adjustable nozzles · CPC title

• F25B41/39 Primary

  Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator · CPC title

• F04F5/46

  Arrangements of nozzles · CPC title

• F04F5/50

  of compressing pumps · CPC title

• F25B2341/0012

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