Ejector

Patent metadata

Field	Value
Publication number	US-11460049-B2
Application number	US-201816209246-A
Country	US
Kind code	B2
Filing date	Dec 4, 2018
Priority date	Jun 6, 2016
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

An ejector includes a shaft coupled to a passage formation member defining a refrigerant passage inside a body, and the shaft is slidably supported by a support member fixed to the body. A drive mechanism moves the shaft in an axial direction to change a passage sectional area of the refrigerant passage. The passage formation member is provided with a vibration suppressive member including a first mobile end that applies a load to enlarge the refrigerant passage and a second mobile end that applies a load to narrow the refrigerant passage. Both the first mobile end and the second mobile end are disposed on a same side of a slide region of the support member in the axial direction.

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 that allows a high-pressure refrigerant to flow thereinto, a pressure reducing space that has a shape of a solid of revolution and reduces a pressure of the refrigerant flowing out of the inflow space, a suction passage that communicates with a downstream side of the pressure reducing space in a refrigerant flow and allows the refrigerant sucked from a refrigerant suction port to flow through the suction passage, and a pressurization space that allows the refrigerant jetted from the pressure reducing space and the refrigerant sucked through the suction passage to flow into the pressurization space;
a passage formation member at least partially disposed inside the pressure reducing space and at least partially disposed inside the pressurization space;
a drive mechanism configured to output driving force for moving the passage formation member;
a support member that has a cylindrical shape and slidably supports a shaft, the shaft having a cylindrical columnar shape and coupled to the passage formation member; and
a vibration suppressive member configured to suppress vibration of the passage formation member,
wherein:
a refrigerant passage provided between an inner peripheral surface of a portion of the body defining the pressure reducing space and an outer peripheral surface of the passage formation member is a nozzle passage functioning as a nozzle that reduces the pressure of the refrigerant and jets the refrigerant;
a refrigerant passage provided between an inner peripheral surface of a portion of the body defining the pressurization space and the outer peripheral surface of the passage formation member is a diffuser passage functioning as a pressurizing portion that mixes and pressurizes the jetted refrigerant and the sucked refrigerant;
a center axis of the support member is coaxial with a center axis of the pressure reducing space;
when viewed in a direction perpendicular to an axial direction of the pressure reducing space, a throat portion of the body at which a passage sectional area of the nozzle passage is smallest in the nozzle passage is positioned outside a range overlapping a slide region of the support portion on which the shaft is slidable;
the vibration suppressive member includes a first elastic member configured to apply a load to the passage formation member in a direction of increasing the passage sectional area of the nozzle passage, and a second elastic member configured to apply a load to the passage formation member in a direction opposite to the direction of the load applied by the first elastic member;
the shaft is one shaft connecting the first elastic member and the second elastic member;
an end of the first elastic member that is movable to apply the load via the shaft to the passage formation member is defined as a first mobile end;
an end of the second elastic member that is movable to apply the load via the shaft to the passage formation member is defined as a second mobile end;
when viewed in the direction perpendicular to the axial direction of the pressure reducing space, the first mobile end and the second mobile end are positioned outside the range overlapping the slide region, and both the first mobile end and the second mobile end are positioned on a same side of the slide region in the axial direction and positioned opposite another side of the slide region on which the throat portion is positioned;
the passage formation member has a conical shape; and
an apex of the conical shape is located within the pressure reducing space, and a diameter of the conical shape increases in a direction of the flow.

2. The ejector according to claim 1 , further comprising a load receiving member being in contact with the first mobile end and the second mobile end, wherein
the shaft and the load receiving member are formed as separate members and are disposed to be in contact with each other.

3. The ejector according to claim 2 , wherein the load receiving member and the shaft are in point contact with each other.

4. The ejector according to claim 1 , wherein one of an outer peripheral surface of the shaft and an inner peripheral surface of the support member has a projection that projects toward and is in contact with another of the outer peripheral surface of the shaft and the inner peripheral surface of the support member.

5. The ejector according to claim 1 , wherein
the drive mechanism includes an enclosure space formation member having an enclosure space enclosing a temperature sensitive medium that undergoes pressure change in accordance with temperature change, an introduction space formation member having an introduction space allowing the sucked refrigerant to flow thereinto, and a pressure responsive member moved by change in pressure difference between the temperature sensitive medium and the sucked refrigerant, and
the pressure responsive member is made of rubber.

6. An ejector applied to a vapor-compression refrigeration cycle device, the ejector comprising:
a body including a pressure reducing space that has a shape of a solid of revolution and reduces a pressure of refrigerant;
a passage formation member at least partially disposed inside the pressure reducing space;
a drive mechanism configured to move the passage formation member in an axial direction of the pressure reducing space;
a support member that has a cylindrical shape and slidably supports a shaft, the shaft having a cylindrical columnar shape and coupled to the passage formation member, the support member having a slide region on which the shaft is slidable; and
a vibration suppressor configured to suppress vibration of the passage formation member,
wherein:
a refrigerant passage provided between an inner peripheral surface of a portion of the body defining the pressure reducing space and an outer peripheral surface of the passage formation member is defined as a nozzle passage;
a center axis of the support member is coaxial with a center axis of the pressure reducing space;
when viewed in a direction perpendicular to the axial direction of the pressure reducing space, a throat portion of the body at which a passage sectional area of the nozzle passage is smallest in the nozzle passage is positioned outside a range overlapping the slide region of the support portion;
the vibration suppressor includes a first elastic member configured to apply a load to the passage formation member in a direction of increasing the passage sectional area of the nozzle passage, and a second elastic member configured to apply a load to the passage formation member in a direction opposite to the direction of the load applied by the first elastic member;
the shaft is one shaft connecting the first elastic member and the second elastic member;
an end of the first elastic member that is movable to apply the load via the shaft to the passage formation member is defined as a first mobile end;
an end of the second elastic member that is movable to apply the load via the shaft to the passage formation member is defined as a second mobile end;
when viewed in the direction perpendicular to the axial direction of the pressure reducing space, the first mobile end and the second mobile end are positioned outside the range overlapping the slide region of the support portion, and both the first mobile end and the second mobile end are positioned on a same side of the slide region in the axial direction and positioned opposite another side of the slide region on which the throat portion is positioned;
the passage formation member has a conical shape; and
an apex of the conical shape is located within the pressure reducing space, and a diameter

Assignees

• Denso Corp

Inventors

• Kawamoto Yoichiro
• Mizutori Kazunori
• Yamada Etsuhisa
• Hotta Teruyuki
• Tanaka Eitaro

Classifications

• F25B1/00

  Compression machines, plants or systems with non-reversible cycle (F25B3/00, F25B5/00, F25B6/00, F25B7/00, F25B9/00 take precedence) · CPC title

• F04F5/10 Primary

  displacing liquids, e.g. containing solids, or liquids and elastic fluids · CPC title

• F04F5/46

  Arrangements of nozzles · CPC title

• F04F5/18

  for compressing · CPC title

• F04F5/20

  for evacuating · CPC title