JPH11276938A - Spraying nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spraying nozzle enabling to spray while a low viscosity liquid is excellently dispersed into a high viscosity slurry. SOLUTION: The low viscosity liquid injected from an injection port 19 flows along the inner wall of a pipe 11 together with a fluidizing slurry, coming into collision with the outer wall of a cylindrical guide 17 extending into the pipe 11 and flows so as to go around the circumference of the cylindrical guide 17. Since the slurry in the cylindrical guide 17 is jetted forward through a nozzle hole 15 with compressed air ejected from an air injector 18, the low viscosity liquid is sucked into the inside of the guide 17 over a peripheral part of the cylindrical guide 17 and is jetted through the nozzle hole 15, while it is excellently dispersed into the slurry.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray nozzle, and more particularly to a nozzle for dispersing and spraying a low-viscosity liquid such as a hardening accelerator in a mortar such as hydraulic cement or a high-viscosity slurry. .

[0002]

2. Description of the Related Art A conventional spray nozzle of this type is shown in FIG. A nozzle hole 2 is formed at the tip of a pipe 1 into which the slurry is introduced, and an air injector 3 is fixedly provided. The nozzle hole 2 is formed obliquely at a predetermined angle with respect to the center axis of the pipe 1.
Are arranged coaxially with the nozzle hole 2 and opposed to the nozzle hole 2. In addition, an inlet 4 for introducing a low-viscosity liquid is opened in the pipe 1 on the same side as the nozzle hole 2.

A high-viscosity slurry is fed into a pipe 1 from a slurry storage device (not shown) via a transfer hose by a pump, and flows toward a nozzle hole 2 as a plug flow. On the other hand, a low-viscosity liquid such as a curing accelerator is supplied into the pipe 1 from an injection port 4 formed in a side portion of the pipe 1, and flows toward the nozzle hole 2 together with the flowing slurry. When the slurry and the low-viscosity liquid reach the vicinity of the nozzle hole 2, the compressed air ejected from the air injector 3 causes the nozzle hole 2.
It is injected while being dispersed from.

[0004]

As described above, the slurry and the low-viscosity liquid are jetted from the spray nozzle.
As shown in FIG. 3, since the high-viscosity slurry flows through the pipe 1, the low-viscosity liquid injected from the injection port 4 flows to the nozzle hole 2 along the inner wall of the pipe 1, and as it is in FIG.
At the lower half of the nozzle hole 2. As a result, there is a problem that the low-viscosity liquid is difficult to be uniformly dispersed in the slurry. If the low viscosity liquid is not evenly dispersed in the slurry, the curing time of the sprayed slurry will vary in the spray pattern.

As shown in FIG. 4, when an injection port 4 for introducing a low-viscosity liquid is formed at the side of the pipe 1 on the side of the air injector 3, the low-viscosity liquid is supplied to the nozzle hole 2.
In this case, it is difficult to uniformly disperse the low-viscosity liquid in the slurry as in the spray nozzle of FIG. As shown in FIG. 5, an injection pipe 5 is formed by projecting the injection pipe 5 from the side of the pipe 1 into the pipe 1, and an injection port 4 opened at the tip of the injection pipe 5 is arranged on the central axis of the pipe 1. Then, the low-viscosity liquid flows toward the nozzle hole 2 along the central axis of the pipe 1 together with the flowing slurry. The liquid will not be well dispersed. Furthermore, since the injection pipe 5 protrudes into the pipe 1, the structure becomes complicated, which takes time for machining and the like, and causes a problem that the slurry is easily clogged in the injection pipe 5.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a spray nozzle capable of spraying a low-viscosity liquid while satisfactorily dispersing the same in a high-viscosity slurry. Aim.

[0007]

A spray nozzle according to the present invention comprises: a pipe into which slurry is introduced; a nozzle hole formed at a tip of the pipe at a predetermined angle with respect to a center axis of the pipe; An air injector that is disposed so as to protrude into the pipe so that its tip portion faces the nozzle hole and that jets compressed air toward the nozzle hole, an injection port for a low-viscosity liquid that opens on the inner wall of the pipe, and a nozzle A cylindrical guide extending from the outer peripheral portion of the hole into the pipe.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a configuration of a spray nozzle according to an embodiment of the present invention. At the tip of the pipe 11 into which the slurry is introduced, the opening 1 is formed obliquely at a predetermined angle with respect to the central axis of the pipe 11, for example, at an angle of 45 °.
2, a substantially cylindrical nozzle tip member 13 is inserted into the opening 12 from the front thereof.
The nozzle tip member 13 has a flange 14 protruding outward at a peripheral edge of the front end, and a nozzle hole 15 at the center of the front end face.
Is open. The rear of the nozzle tip member 13 is the pipe 1
The flange 14 is fixed to the peripheral portion of the opening 12 of the pipe 11 by an annular pressing member 16. The rear end of the nozzle tip member 13 extends into the pipe 11, and constitutes the cylindrical guide 17 of the present invention.

At the tip of the pipe 11, an air injector 18 is arranged coaxially with the nozzle hole 15 and opposed to the nozzle hole 15. This air injector 18
It is provided slidably in the front-rear direction so that it can be taken in and out of the pipe 11. Further, the pipe 1 is provided on the same side as the nozzle hole 15 and with respect to the flow of the slurry.
Inlet 1 for introducing low-viscosity liquid upstream of 5
9 is open.

Next, the operation of the spray nozzle according to this embodiment will be described. A high-viscosity slurry is fed into the pipe 11 from a slurry storage device (not shown) by a pump via a transfer hose, and a low-viscosity liquid such as a hardening accelerator is supplied from the inlet 19 into the pipe 11. Compressed air is ejected from inside the cylindrical guide 17 and toward the nozzle hole 15. The slurry flows in the pipe 11 as a plug flow toward the nozzle hole 15, and the low-viscosity liquid injected from the injection port 19 flows toward the nozzle hole 15 together with the flowing slurry. At this time,
Since the high-viscosity slurry flows in the pipe 11, the low-viscosity liquid flows along the inner wall of the pipe 11, and collides with the outer wall of the cylindrical guide 17 extending into the pipe 11. Here, the low-viscosity liquid flows around the cylindrical guide 17, but the slurry inside the cylindrical guide 17 is jetted forward from the nozzle hole 15 by the compressed air jetted from the air injector 18. Therefore, the low-viscosity liquid is sucked into the inside of the guide 17 beyond the peripheral edge of the cylindrical guide 17, and is jetted from the nozzle hole 15 while being dispersed in the slurry. In this way, it becomes possible to spray the low-viscosity liquid while dispersing it well in the high-viscosity slurry.

In the spray nozzle shown in FIG. 1, an injection port 19 for injecting a low-viscosity liquid is provided in the pipe 1.
1, since the injection pipe does not protrude into the pipe 11, the structure is simplified, and the injection pipe is not likely to be clogged by the slurry.

The spray nozzle shown in FIG. 1 is configured so as to leave a predetermined space between the tip of the air injector 18 and the rear end of the cylindrical guide 17, as shown in FIG. Alternatively, the distal end of the air injector 18 may be located on the same plane as the rear end of the cylindrical guide 21 of the nozzle distal member 20. In the spray nozzle shown in FIG. 2 as well, it becomes possible to spray the low-viscosity liquid while dispersing it well in the high-viscosity slurry, similarly to the spray nozzle in FIG.

In the spray nozzle shown in FIG. 2, the front surface of the nozzle tip member 20 projects forward to increase the distance from the tip of the air injector 18 to the nozzle hole, and the nozzle hole 22 is formed here. Have been.

The cross-sectional shape of the cylindrical guides 17 and 21 is not limited to a specific shape, but a cylindrical guide having a cross-sectional shape such as a circle, an ellipse, or a polygon such as a triangle or a rectangle is used. You can also.

[0015]

As described above, according to the present invention, since the cylindrical guide extending from the outer periphery of the nozzle hole into the pipe is provided, the low-viscosity liquid supplied into the pipe from the injection port is supplied to the cylinder. The liquid is sucked into the inside of the shape guide beyond the peripheral portion thereof, and the low-viscosity liquid can be sprayed from the nozzle hole while being well dispersed in the high-viscosity slurry.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a spray nozzle according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a spray nozzle according to another embodiment.

FIG. 3 is a sectional view showing a conventional spray nozzle.

FIG. 4 is a sectional view showing another conventional spray nozzle.

FIG. 5 is a sectional view showing still another conventional spray nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Pipe 12 Opening 13 and 20 Nozzle tip member 14 Flange 15 and 22 Nozzle hole 16 Holding member 17 and 21 Cylindrical guide 18 Air injector 19 Injection port

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaaki Oda 6-1 Kashiwara, Ishioka City, Ibaraki Pref. Inside the Building Materials Technology Laboratory (72) Inventor Tadanori Shibata 6-1 Kashiwara, Ishioka City, Ibaraki Pref. In-house (72) Inventor Osamu Tanaka 2-5-5 Tsurumi-chuo, Tsurumi-ku, Yokohama-shi, Kanagawa Pref. Inside (72) Inventor Tsutomu Horiguchi 2-5-5 Tsurumi-chuo, Tsurumi-ku, Yokohama-shi, Kanagawa Ask techno construction Inside the corporation

Claims (1)

[Claims] 1. A pipe into which slurry is introduced, a nozzle hole formed at a predetermined angle with respect to a center axis of the pipe at a tip of the pipe, and a tip of the pipe facing the nozzle hole. An air injector protruding into the pipe and ejecting compressed air toward the nozzle hole, an injection port of a low-viscosity liquid opening in an inner wall portion of the pipe, and an outer peripheral portion of the nozzle hole. A spray nozzle comprising: a tubular guide extending into a pipe.