JP2003294000A - Ejector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple ejector in which a suction pipe is hardly closed even when solid matter is sucked into the pipe together with fluid, and the solid matter is fed without being damaged. <P>SOLUTION: This ejector 1 ejects pressurized fluid A in a fluid pipe 2 from a nozzle 3, causes a negative pressure on the downstream side thereof, and sucks the other fluid B from the suction pipe 4. A cutout elbow pipe 6 connected to the opening 5 of the suction pipe 4 is formed in the fluid pipe 2. The cutout elbow pipe 6 comprises: an orthogonal pipe part 7 extending generally at right angle from the peripheral edge of the opening 5 of the suction pipe 4 toward the axis of the fluid pipe 2; and a vertical split pipe part 8 bending generally at right angle from the end of the orthogonal pipe part 7 and openably extending a specified length to the downstream side along the axis of the fluid pipe 2. The orthogonal pipe part 7 of the cutout elbow pipe 6 is projected into the fluid pipe 2 within the range of 1/2 or less of the inner diameter of the nozzle 3. The vertical split pipe part 8 is formed in a gutter shape opening along the axis of the fluid pipe 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to, for example, a gas,
The present invention relates to an ejector that sucks a solid material together with a liquid, a gas, or a liquid, and more specifically, to an ejector that can suck a solid material without destroying the solid material, has a simple structure, has a low processing cost, and has few malfunctions.

[0002]

2. Description of the Related Art FIG. 5 is a schematic sectional view of a conventional venturi type ejector. In the figure, 31 is a suction pipe, which sucks and transfers fluid such as gas and liquid downward in the figure. The suction pipe 31 has a large diameter portion 32, a narrow portion 33, and a flare portion 34. A pressurized fluid supply pipe 35 into which a pressurized fluid such as gas or liquid is pumped is introduced into the large diameter portion 32 of the suction pipe 31. The pressurized fluid supply pipe 35 is bent in the large diameter portion 32 in the downstream direction of the suction pipe 31, and a nozzle 36 is formed at the tip thereof. The tip of the nozzle 36 is arranged at a position close to the upstream side of the narrow portion 33 of the suction pipe 31. Pressurized fluid supply pipe 35
The supplied pressurized fluid is throttled by the nozzle 36 and is vigorously ejected toward the narrow portion 33, so that a negative pressure is generated in the large diameter portion 32. Due to this negative pressure, another fluid is sucked into the suction pipe 31, and is discharged downward together with the pressurized fluid.

[0003]

In such a conventional venturi type ejector, when a solid substance is sucked together with a fluid into the suction pipe, the solid substance is likely to be clogged near the narrow portion. In order to prevent this, when the diameter of the bottle is increased or the nozzle is moved away from the bottle, the pressure of the pressurized fluid must be increased, which requires a large amount of energy. Also, if an ejector tries to send solid foods, such as processed foods and live fish, without damage, it will be directly exposed to the jet water jet ejected from the nozzle, and will also be densely collided with the tip of the nozzle and the narrow portion 33. Therefore, there is a problem that it is easily destroyed. Therefore, according to the present invention, even when the solid matter is sucked into the suction pipe together with the fluid, the clogging is unlikely to occur, a relatively large pressure is not required, and the solid matter can be sent without damage. The challenge is to provide ejectors.

[0004]

In the present invention, in order to solve the above-mentioned problems, a fluid pipe 2 provided with a nozzle 3 from which a pressurized fluid A is jetted, and a downstream side of the nozzle 3 in the fluid pipe 2. In the ejector 1 for sucking another fluid B from the suction pipe 4 into the fluid pipe 2 by the traction action of the pressurized fluid A, the suction pipe 4 is connected to the suction pipe 4 inside the fluid pipe 2. The notched elbow pipe 6 connected to the opening 5 of No. 4 was adopted. The notched elbow pipe 6 extends from the peripheral edge of the opening 5 of the suction pipe 4 to the axial center of the fluid pipe 2 at a substantially right angle, and is bent at a substantially right angle from the end of the orthogonal pipe part 7. A vertical split pipe portion 8 is provided which extends downstream by a predetermined length along the axis of the fluid pipe 2 and opens.
The orthogonal pipe portion 7 of the notched elbow pipe 6 is 1 / n of the inner diameter of the nozzle 3.
The vertical split pipe portion 8 is formed into a gutter shape that is open along the axis of the fluid pipe 2 by projecting it into the fluid pipe 2 within a range of 2 or less. When the pressurized fluid A is jetted from the nozzle 3, it collides with the orthogonal pipe portion 7 of the notched elbow pipe 6 and a Karman vortex flow 10 is generated, and the vicinity of the tip of the orthogonal pipe portion 7 is made negative pressure, and the other fluid B is discharged. Suction tube 4
Is sucked into the fluid pipe 2. The fluid pipe 2 has a large cross-sectional area,
Since there is no collision site and the flow velocity of the pressurized fluid A sharply decreases on the downstream side of the orthogonal pipe section 7, the solid matter sucked by the suction pipe 4 together with the fluid B is sent to the downstream side without being greatly damaged. To be

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. 1 is a schematic sectional view of an ejector of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is FIG.
FIG. 3 is a view on arrow III in FIG.

The illustrated ejector 1 includes a fluid pipe 2 having a nozzle 3 and a suction pipe 4 connected to the fluid pipe 2 so as to open downstream of the nozzle 3. The inner diameter of the suction pipe 4 is smaller than the inner diameter of the fluid pipe. A pressurized fluid such as water flows through the fluid pipe 2 and is ejected from the nozzle 3. Another fluid B is sucked from the suction pipe 4 into the fluid pipe 2 by the pulling action of the pressurized fluid A ejected from the nozzle 3.

A notched elbow pipe 6 is provided in the fluid pipe 2 so as to connect to the opening 5 of the suction pipe 4 on the fluid pipe 2. The notched elbow pipe 6 includes an orthogonal pipe portion 7 and a vertical split pipe portion 8.

The orthogonal pipe portion 7 of the notched elbow pipe 6 is a suction pipe 4
From the peripheral edge of the opening 5 to the axial center of the fluid pipe 6 at a substantially right angle. The orthogonal pipe portion 7 is located at a position of 1/2 or less of the inner diameter of the nozzle 3, preferably about 1/3 of the inner diameter of the fluid pipe 2.
A curved portion 9 is formed at the upper end of the tip protruding inward.

The vertically split pipe portion 8 of the notched elbow pipe 6 is bent at a substantially right angle from the end of the orthogonal pipe portion 7 on the axial side of the fluid pipe, and extends along the axis line to a downstream side for a predetermined length to open. . The vertically split pipe portion 8 has a gutter shape that is opened along the axis of the fluid pipe 2.

The cut-out elbow pipe 6 can be constructed by cutting one half of the elbow pipe in the longitudinal direction, but an equivalent structure can be constructed by another means.

As shown in FIG. 1, the fluid pipe 2 is composed of upper and lower pipe portions 2a and a nozzle portion 2b. The nozzle portion 2b can be configured by fitting and fixing a separate nozzle constituent portion 2c inside the pipe material. Before the fluid pipe 2 is assembled, the notch elbow pipe 6 is inserted into the nozzle portion 2b from below, and one end side of the orthogonal pipe portion 7 is projected outward from a preformed opening to hermetically seal it. .

The water (fluid) A pressurized by the pump and sent into the fluid pipe 2 has its flow velocity increased due to the difference in the diameter of the nozzle 3, and is jetted downstream as a jet flow. The jet flow collides with the orthogonal pipe portion 7 of the notched elbow pipe 6 protruding inward of the fluid pipe 2, and a Karman vortex flow 10 is generated between the nozzle 3 and the orthogonal pipe portion 7 and near the tip of the orthogonal pipe portion 7. The Karman vortex flow 10 generates a negative pressure in the vicinity of the tip of the orthogonal pipe portion 7, sucks another fluid B into the suction pipe 4 and joins it into the fluid pipe 2. The negative pressure is increased by the velocity gradient between the inside and the outside (the left side in FIG. 1) of the vertical split tube portion 8.
When carrying out nondestructive flow of foods or the like, the object is sucked into the suction tube 4 together with the liquid. An object flowing from the suction pipe 4 into the fluid pipe 2 has no collision site anywhere, and thus is protected from destruction.
Further, below the tip of the orthogonal pipe portion 7, the jet flow reduces the velocity due to the resistance of the orthogonal pipe portion 7 and the cross-sectional area of the flow channel rapidly expanding, so that the destructive force against the object is weakened. The fact that it is provided also prevents the inflowing objects from being destroyed.

This ejector 1 can be applied, for example, as shown in FIG. 4, to introduce air into a treatment liquid in a human waste treatment tank or the like. A processing liquid is circulated in the fluid pipe 2 by a pump, and the upper end of the suction pipe 4 is projected above the liquid surface. By adjusting the position of the upper end of the suction pipe 4, the scum floating on the liquid surface together with the air and the treatment liquid can be sucked and stirred.

As a result of the experiment, it was confirmed that the ejector 1 of this embodiment increases the amount of intake air from the suction pipe by 30 to 50% as compared with the equivalent venturi type ejector.

[0015]

As described above, according to the ejector of the present invention, the solid matter can be sent smoothly without being blocked and without being broken. Also applied to septic tanks for human waste treatment, grease trap tanks for kitchen drainage,
When the floating scum, oil and fat, odorous gas, and the like are sucked together with air by a suction pipe and the bottom of the tank is operated so as to be decomposed by microorganisms, the system can be efficiently operated by a large suction force. Further, it is possible to contribute to energy saving by making the shaft power of the pressure-feeding pump relatively small.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an ejector of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a view on arrow III in FIG.

FIG. 4 is a schematic sectional view of an ejector according to another embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a conventional Venturi type ejector.

[Explanation of symbols]

1 ejector 2 fluid pipe 3 nozzles 4 suction tube 5 openings 6 Notched elbow pipe 7 Orthogonal tube section 8 Vertical split pipe section 9 curved part 10 Karman vortex A pressurized fluid B suction fluid

Claims (5)

[Claims] 1. A traction action of a pressurized fluid, comprising: a fluid pipe provided with a nozzle for ejecting the pressurized fluid; and a suction pipe connected to the fluid pipe so as to open downstream of the nozzle. In the ejector for sucking another fluid from the suction pipe into the fluid pipe by the cutout elbow pipe, which is connected to the opening of the suction pipe on the fluid pipe, is provided in the fluid pipe. An orthogonal pipe portion extending from the peripheral edge of the opening to the axial center of the fluid pipe at a right angle to the axial center of the fluid pipe, and an end of the orthogonal pipe portion on the axial side of the fluid pipe bent substantially at a right angle to the axial center of the fluid pipe. A vertical split tube portion that extends to a downstream side of the pressurized fluid and opens for a predetermined length, and the orthogonal pipe portion of the notch elbow pipe projects into the fluid pipe to the inside of the inner diameter of the nozzle, and the notch The vertical split pipe part of the elbow pipe is attached to the axis of the fluid pipe. An ejector characterized by a gutter shape that is open along. 2. The ejector according to claim 1, wherein the orthogonal pipe portion of the notched elbow pipe projects into the fluid pipe up to about 1/3 of the inner diameter of the nozzle. 3. The ejector according to claim 1, wherein the diameter of the opening of the suction pipe is smaller than the diameter of the fluid pipe. 4. The pressurized fluid flowing through the fluid pipe is a liquid, and the fluid sucked into the suction pipe is a gas that conveys a solid matter, according to any one of claims 1 to 3. Ejector described. 5. The pressurized fluid flowing through the fluid pipe is a liquid, and the fluid sucked into the suction pipe is a liquid that conveys a solid material. Ejector described.