Industrial ejector having improved suction performance

Patent metadata

Field	Value
Publication number	US-11174879-B2
Application number	US-201916562617-A
Country	US
Kind code	B2
Filing date	Sep 6, 2019
Priority date	Sep 10, 2018
Publication date	Nov 16, 2021
Grant date	Nov 16, 2021

Abstract

An industrial ejector includes: a Laval nozzle in which a first channel which has a throat and along which a fluid flows in a first direction is formed; and a main body which is formed in a tubular shape, in which the Laval nozzle disposed therein is fixed to a part of an inner surface thereof, and in which a second channel is formed between the rest of the inner surface and the Laval nozzle. The second channel is disposed at a first side with respect to the first channel in a second direction perpendicular to the first direction. An opening is obliquely cut and formed in an end of the first channel at a downstream side and inclined toward the first side in the downstream direction and then toward the second channel.

First claim

What is claimed is:

1. An industrial ejector comprising:
a Laval nozzle in which a first channel which has a throat and along which a fluid flows in a first direction is formed; and
a main body having a tubular shape and having a second channel, the Laval nozzle being disposed in the main body and fixed to a part of an inner surface of the main body and the second channel being formed between an opposite part of the inner surface of the main body and the Laval nozzle,
wherein the second channel is disposed at a first side of the channel in a second direction perpendicular to the first direction,
wherein a cutout that comprises an opening is obliquely cut and formed in an end of the first channel at a downstream side and is inclined toward the first side in the upstream direction and toward the second channel,
wherein the first channel and the second channel are disposed in parallel, and
wherein the opening obliquely cut is arranged along an inner surface of the main body.

2. The industrial ejector according to claim 1 , wherein an angle formed by the first direction and the opening is greater than 0° and smaller than 90°.

3. The industrial ejector according to claim 2 , wherein a Mach number of a flow velocity of the fluid flowing in the throat is 1.

4. The industrial ejector according to claim 1 , wherein a Mach number of a flow velocity of the fluid flowing in the throat is 1.

5. The industrial ejector according to claim 1 ,
wherein an angle θ 1 formed by the first direction and the opening is greater than 0° and is smaller than 90°, wherein the angle θ 1 is an angle that is formed by an axis along the first direction and the opening, and is formed at the downstream side relative to the opening and at a second side which is a side opposite to the first side relative to the axis,
wherein an angle θ 2 at which the opening is directed closer to the second channel than the first direction is greater than 0°, and is smaller than 90°, and
wherein, thereby the Laval nozzle is configured not to be rotationally symmetric around the axis along the first direction.

Assignees

• Japan Aerospace Exploration

Inventors

• Hasegawa Susumu
• Tani Kouichiro

Classifications

• F04F5/20 Primary

  for evacuating · CPC title

• F04F5/465 Primary

  with supersonic flow (mixing of supersonic fluids B01F25/20) · CPC title

• F04F5/466

  with a plurality of nozzles arranged in parallel · CPC title