Ejector

Patent metadata

Field	Value
Publication number	US-10018386-B2
Application number	US-201414898704-A
Country	US
Kind code	B2
Filing date	May 27, 2014
Priority date	Jun 18, 2013
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

A swirl space forming member that forms a swirl space in which a refrigerant flowing into a nozzle portion of an ejector swirls around an axis of the nozzle portion. In this way, even when the refrigerant flowing out of a first evaporator is a gas-phase refrigerant, pressure of the refrigerant on a swirling center axis side in the swirl space is reduced to be able to start condensation by swirling the refrigerant, and a gas-liquid two-phase refrigerant in which a condensation nucleus is generated can flow into the nozzle portion. Thus, occurrence of a condensation delay in the refrigerant in the nozzle portion can be restricted.

First claim

What is claimed is:

1. An ejector for a vapor compressional refrigeration cycle device that has a first evaporator and a second evaporator evaporating a refrigerant, the ejector comprising:
a nozzle portion that decompresses the refrigerant flowing out of the first evaporator until the refrigerant becomes a gas-liquid two-phase state, the nozzle portion injecting the refrigerant from a refrigerant injection port;
a body portion;
a refrigerant suction port that is provided in the body portion and draws a refrigerant flowing out of the second evaporator as a suction refrigerant by a suction action of an injection refrigerant injected from the nozzle portion;
a pressure increase portion that is provided in the body portion and boosts pressure of a mixed refrigerant of the injection refrigerant and the suction refrigerant; and
a swirl space forming member that forms a swirl space in which the refrigerant flowing into the nozzle portion swirls around an axis of the nozzle portion, wherein
the nozzle portion has an inlet that is connected to a liquid storage section, the liquid storage section being disposed in the vapor compressional refrigeration cycle and storing a surplus refrigerant in the vapor compressional refrigeration cycle, a gas-liquid two phase refrigerant flowing out of the liquid storage section,
the liquid storage section has an inlet directly connected to a refrigerant outlet of the first evaporator and an outlet connected to the inlet of the nozzle portion, and
the gas-liquid two phase refrigerant flowing out of the liquid storage section flows into the inlet of the nozzle portion.

2. The ejector according to claim 1 further comprising:
a mixing portion that is provided in an area from the refrigerant injection port to an inlet section of the pressure increase portion in an internal space of the body portion and mixes the injection refrigerant and the suction refrigerant, wherein
a distance from the refrigerant injection port to the inlet section in the mixing portion is determined such that a flow velocity of the refrigerant flowing into the inlet section becomes lower than or equal to a two-phase sound velocity.

3. The ejector according to claim 2 , wherein
when the distance from the refrigerant injection port to the inlet section in the mixing portion is referred to as La, and when a diameter of a circle is referred to as ϕDa, the circle that is converted as a circle of which area has a total value of (i) an opening cross-sectional area of the refrigerant injection port and (ii) a refrigerant passage cross-sectional area of a suction passage through which the suction refrigerant flows, the circle being converted in a cross section, perpendicular to an axial direction, of the nozzle portion including the refrigerant injection port,
the following formula is satisfied:
La/ϕDa≤ 1.

4. The ejector according to claim 2 , wherein
a refrigerant passage area of the inlet section is set smaller than a refrigerant passage area of the refrigerant injection port.

5. The ejector according to claim 1 further comprising:
a mixing portion that is provided in the area from the refrigerant injection port to the inlet section of the pressure increase portion in the internal space of the body portion and mixes the injection refrigerant and the suction refrigerant; and
a tapered section, in which a refrigerant passage cross-sectional area is gradually reduced toward a refrigerant flow downstream side, and an injecting section guiding the refrigerant from the tapered section to the refrigerant injection port, the tapered section and the injecting section provided as a refrigerant passage formed in the nozzle portion, wherein
the nozzle portion is formed to freely expand the injection refrigerant that is injected to the mixing portion by setting an expanding angle in an axial cross section of the injecting section to be larger than or equal to 0°.

6. The ejector according to claim 1 , wherein
the mixing portion has a shape in which the refrigerant passage cross-sectional area is reduced toward the refrigerant flow downstream side.

7. The ejector according to claim 1 , wherein
the mixing portion is formed in a shape that is a combination of (i) a truncated cone shape in which the refrigerant passage cross-sectional area is gradually reduced toward the refrigerant flow downstream side and (ii) a columnar shape in which the refrigerant passage cross-sectional area is fixed.

8. The ejector according to claim 7 , wherein
when an axial length of the nozzle portion in a columnar-shaped portion of the mixing portion is referred to as Lb, and when a diameter of a columnar-shaped portion is referred to as ϕDb, a formula of Lb/ϕDb≤1 is satisfied.

9. The ejector according to claim 1 , further comprising
a valve body changing the refrigerant passage area of the nozzle portion.

Assignees

• Denso Corp

Inventors

• Nishijima Haruyuki
• Kayano Kenta
• Takano Yoshiaki

Classifications

• F25B2341/0015

  using two or more ejectors · CPC title

• B60H2001/3298

  Ejector-type refrigerant circuits · CPC title

• F25B2341/0013

  Ejector control arrangements · CPC title

• F04F5/20

  for evacuating · CPC title

• F04F5/16

  displacing elastic fluids · CPC title