JPH09184500A - Ejector - Google Patents

Abstract

(57) Abstract: An ejector that can be connected to an elongated rectangular duct is provided. In an ejector connected to a duct having a rectangular cross section, a pair of lower introduction plates (13) narrowed in the short side direction are provided on a long side of an ejector main body (10) having a rectangular cross section connected to the duct. , Its lower introduction plate 1
An upper discharge plate 14 is provided which covers the upper end of the spacer 3 at a distance and the upper part of which is expanded in the direction of the short side. The introduction chamber 18 is formed, and the lower introduction plate 13 is formed.
A rectifying body 21 is provided in the upper part between the ejector body 10 and
Further, a wind box 19 for linearly blowing air from the gap 16 between the lower introduction plate 13 and the upper discharge plate 14 to the inner wall of the upper discharge plate 14 is connected via the air introduction chamber 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ejector for generating a suctioned air flow, and more particularly to an ejector that can be connected to a duct having a rectangular cross section with a relatively large flow passage cross section.

[0002]

2. Description of the Related Art Conventionally, an ejector as an air pump has a nozzle arranged in the center thereof to generate a suction force by its jetting force, but the jetting force and pressure loss increase.

Therefore, as disclosed in Japanese Examined Patent Publication No. 3-62968 (Title of Invention: Circular Nozzle for Chimney Exhaust Cylinder), an ejector for linearly blowing air to the inner peripheral wall of the duct to generate a suction flow. It has been known.

In this ejector structure, a wind box is provided on the outer circumference of a cylindrical duct, and air is blown out linearly from the wind box to generate a suction air flow. By ejecting this ejector linearly from the inner peripheral wall of the duct, the ejecting force and the pressure loss can be reduced and a suction flow can be generated.

[0005]

However, when a pollution source is surrounded by a booth such as a local exhaust system and a part of the air in the booth is exhausted and the air is mixed with clean air and circulated, a circulation duct of the circulation duct is used. The ejector described above cannot be applied where the cross-sectional shape is an elongated rectangular shape and the circulating air flow rate is small.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide an ejector which can be connected to an elongated rectangular duct.

[0007]

In order to achieve the above object, the present invention provides an ejector connected to a duct having a rectangular cross section, in which a long side in a ejector main body having a rectangular cross section is connected to the duct. In addition to providing a pair of lower introduction plates that are narrowed in the short side direction, an upper discharge plate that covers the upper ends of the lower introduction plates at intervals and has an upper portion that expands in the short side direction, and the long sides of the ejector body. An air introducing chamber is formed between the side inner wall and the lower introducing plate and the upper discharging plate, a rectifying body is provided above the lower introducing plate, and the lower introducing plate and the upper discharging are provided in the ejector body through the air introducing chamber. It is an ejector in which a wind box for blowing air linearly is connected to the inner wall of the upper discharge plate from the gap between the plates.

According to a second aspect of the present invention, the lower portions of the pair of upper discharge plates are provided in the ejector body at intervals so as to cover the lower introduction plate with a predetermined gap, and the enlarged diameter portion is provided at the lower end thereof. The ejector according to claim 1.

According to a third aspect of the present invention, the ejector according to the first or second aspect is provided with a rectifying fin for linearly rectifying the air from the air introducing chamber in a gap between the lower introducing plate and the upper discharging plate. Is.

A fourth aspect of the invention is the ejector according to the first to third aspects, in which the rectifying body is formed in a streamlined cross section.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First, FIG. 1 is a schematic perspective view of the present invention, and FIG.
2A is a sectional view taken along the line AA of FIG. 1, and FIG.
It is an enlarged view of the principal part of (a).

In the figure, reference numeral 10 denotes an ejector main body having a rectangular cross section, and flanges 11 for connecting to a circulation duct (not shown) are formed above and below the ejector main body. The ejector body 10 has a long side of, for example, 1
It is formed in a relatively elongated rectangular shape having a length of 200 mm and a short side of 250 mm.

In the lower part of the ejector body 10, a pair of lower introducing plates 13, 13 narrowed in the direction of the shorter side from the inner wall 12 on the longer side thereof are provided. A distance T13 between the lower introduction plates 13 and 13 is a distance Ta in the short side direction of the ejector body 10.
Are formed at intervals of about 1/3 to 1/5.

In the upper part of the ejector main body 10, the upper part is expanded from the long side inner wall 12 and the lower end is squeezed into a funnel shape when viewed in the short side direction, and the lower end is introduced into the lower part. A pair of upper discharge plates 14 and 14 are provided so as to cover the upper ends of the plates 13 and 13 at intervals. Expanded portions 15, 15 are formed at the lower ends of the pair of upper discharge plates 14, 14, and the expanded portion 15, the lower introduction plate 13, and the upper discharge plate 1 are formed.
In the gap 16 between the four, rectifying fins 17 are provided at predetermined intervals in the long side direction.

The long side inner wall 12 of the ejector body 10
The air introducing chambers 18 and 18 are formed between the lower introducing plates 13 and 13 and the upper discharging plates 14 and 14, and a wind box 19 for supplying air to the air introducing chambers 18 and 18 is provided with an ejector body 10. The air inlet 20 is connected to the lower part of the wind box 19.

In the upper part between the lower introducing plates 13, 13, a straight streamliner 21 having a substantially triangular shape and a trapezoidal upper part is formed.
Is provided so as to cover the space between the lower introduction plates 13, 13.

Reference numeral 22 is a stabilizer that supports the upper discharge plate 14 at appropriate intervals.

Next, the operation of the embodiment will be described.

The ejector body 10 is used by being connected to a circulation duct (not shown) of a local exhaust system.

The air introduced into the wind box 19 through the air introduction port 20 is supplied to the air introduction chambers 18, 18 as shown by an arrow 22.
Flow into the air introduction chambers 18 and 18, and the air introduction chambers 18 and 18 are inverted as shown by the arrow 23, so that the lower introduction plate 13 and the upper discharge plate 14
From the gap 16 between the inner wall of the upper discharge plate 14 and the rectifying body 21.
It is blown out as indicated by the arrow 24 along the flow-regulating fins as appropriate through the spaces.

As a result, the passage 13a between the lower introduction plates 13 is formed.
Generates a suction flow, and generates an air flow flowing in the passage 14a between the upper discharge plates 14.

The air blown out from the gap 16 becomes a state in which the passage 14a between the discharge plates 14 is partitioned by the rectifying body 21, so that a circulating flow can be surely generated in the circulation duct even if the amount of blown air is very small. It becomes possible.

[0024]

In summary, according to the present invention, it is possible to obtain an ejector which can be reliably connected to a duct having a rectangular cross section to exert an ejector effect.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention.

FIG. 2 is a detailed cross-sectional view of a main part of FIG.

[Explanation of symbols]

 10 Ejector main body 12 Inner wall 13 Lower introduction plate 14 Upper discharge plate 16 Gap 18 Air introduction chamber 19 Wind box

Continued Front Page (72) Inventor Toshifumi Nakamoto 6-17-16 Higashi Narashino, Narashino City, Chiba Prefecture Asahi Industries Co., Ltd. Technical Research Institute

Claims (4)

[Claims] 1. An ejector connected to a duct having a rectangular cross section, wherein a pair of lower introduction plates narrowed in the short side direction are provided on the long side of an ejector body having a rectangular cross section connected to the duct. An upper discharge plate is provided, which covers the upper end of the lower introduction plate at a distance and the upper part of which expands in the direction of the short side. Is formed, a rectifying body is provided in the upper part between the lower introducing plates, and air is linearly supplied to the inner wall of the upper discharging plate from the gap between the lower introducing plate and the upper discharging plate through the air introducing chamber in the ejector body. An ejector characterized by connecting a wind box for blowing out. 2. The lower portions of the pair of upper discharge plates are provided in the ejector body at intervals so as to cover the lower introduction plate with a predetermined gap, and the lower end thereof has an enlarged diameter portion.
The ejector shown. 3. The gap between the lower introduction plate and the upper discharge plate,
The ejector according to claim 1 or 2, further comprising a rectifying fin for rectifying the air from the air introducing chamber into a linear shape. 4. The ejector according to claim 1, wherein the rectifying body has a streamlined cross section.