JPH09988A - Liquid spray nozzle - Google Patents

Abstract

PURPOSE: To increase the range of a liq. in a flat spray nozzle to be attached to a side wall. CONSTITUTION: An orificial nozzle 1 is formed with a domed cavity 4 formed by continuously forming a semispherical concaved surface 3 on the outlet end of a cylindrical pipeline 2 and a notched groove 5 crossing the tip of the cavity 4 to constitute a liq. spray nozzle. The groove 5 is shifted above a pipe axis X so that, when a liq. from the pipeline 2 flows along the concaved surface 3, an upward water current B is made more powerful than a downward water current C. Accordingly, the jet from the nozzle 1 is flown obliquely upward, and the range is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid spray nozzle suitable for fire-extinguishing or fire-preventing equipment in a vast space such as an atrium space or in a tunnel, or an agricultural sprinkler.

[0002]

2. Description of the Related Art As a liquid spray nozzle of this type, for example, as shown in FIG. 5, a dome-shaped recess (cavity) 4 formed by continuously forming a hemispherical concave curved surface 3 at the outlet side end of a conduit 2. , A cut groove 5 having a V-shaped cross section that intersects the tip of the dome-shaped recess 4
There is a so-called flat spray nozzle in which the orifice-shaped injection port 1 is formed in an elliptical shape with its long axis in the lateral direction when viewed from the front.

[0003]

When the above-mentioned conventional spray nozzle is used by horizontally mounting it on, for example, a side wall of a place where fire extinguishing equipment is installed, the elliptical cut groove 5 has its center at the pipe axis x. Since they are formed so as to coincide with each other, when the water from the conduit 2 flows along the concave curved surface 3, the upper water flow C and the lower water flow B collide with each other so that the water flow from the orifice type jet port 1 to the front is substantially horizontal. It emits, but its flight distance is limited. Therefore, in order to extend the flight distance of water, the spray nozzle was attached to the side wall upward. However, in order to mount the spray nozzle upward on the side wall, it was necessary to mount the spray nozzle while adjusting the angle using a goniometer, which was a very troublesome work. In particular, for example, a large number of spray nozzles are required for fire extinguishing equipment in a large space, so that a lot of time and labor are required for the mounting work. In addition, when installing the spray nozzle on the wall surface, if it is installed upward, it is necessary to take a large part of the wall surface hollow part, and it is necessary to take a large exposed length.
From the outside, the appearance was spoiled. The present invention has been made in view of such a problem, and an object thereof is to provide a liquid spray nozzle capable of extending the flight distance of a liquid even when mounted horizontally.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, a dome-shaped concave portion (foss) formed by continuously forming a hemispherical concave curved surface at the outlet side end of a conduit and a tip portion of the dome-shaped concave portion are intersected. In the liquid spray nozzle that forms an orifice-shaped nozzle with the cut groove, the cut groove is provided so as to be displaced above the pipe axis. It is preferable that a straightening vane is incorporated inside the conduit.

[0005]

When the cut groove is displaced above the pipe axis, when the liquid from the pipe flows along the concave curved surface, the upward force of the liquid flow from the lower side is the liquid flow from the upper side. Since it becomes stronger than the downward momentum, the jet flow ejected from the orifice-shaped ejection port after the liquid from the lower side collides with the liquid from the upper side goes out obliquely above the horizontal direction.

[0006]

【Example】

Example 1 FIG. 1 is a sectional view of a liquid spray nozzle according to an example of the present invention. This spray nozzle has an orifice-shaped nozzle 1. Reference numeral 2 denotes a tubular conduit, and 3 denotes a hemispherical concave curved surface continuously formed at the outlet side end of the conduit 2, and the conduit 2 and the concave curved surface 3 form a dome-shaped recess (fovea) 4. The orifice-shaped injection port 1 is formed by cutting a groove 5 having a groove-shaped cross section at the tip of the dome-shaped recess 4 so as to intersect the tube axis X. By processing so as to shift to the upper side, the orifice injection port 1 is formed so as to have a semi-elliptical shape whose long axis matches the line intersecting with the tube axis X when viewed from the front. Reference numeral 6 is a screw provided on the outer circumference of the inlet side end of the conduit 2. For example, the diameter D of the conduit 2 is 41 mm, the radius r of the concave curved surface 3 is 20 mm, and the cutting angle θ of the cutting groove 5 is 66 °. The semi-elliptical orifice-shaped nozzle 1 has a length H in the major axis direction of 35.3 mm and a length A in the minor axis direction of 13.0 mm.

At this time, when the liquid spray nozzle is horizontally attached to the side wall and water is sprinkled, when the water from the conduit 2 flows along the concave curved surface 3, the upward force of the water flow B from the lower side is increased. Is stronger than the downward force of the water flow C from the upper side, so that the water can be discharged from the orifice-shaped nozzle 1 approximately 10 ° upward and obliquely from the horizontal, and the flight distance can be increased. It was When the amount of water was the same, it was possible to secure almost the same flight distance as when the conventional spray nozzle shown in FIG. 5 was attached to the side wall 25 ° above the horizontal and water was discharged. However, it goes without saying that if the spray nozzle having the above-described structure is mounted upward on the side wall, the flight distance can be further extended as compared with the conventional spray nozzle that is mounted upward.

Embodiment 2 FIG. 2 shows another embodiment. In this embodiment, the cut groove 5 is provided on the upper side of the tube axis X so as to be shifted further upward than in the case of the above-mentioned embodiment, so that the elliptical orifice-shaped injection port 1 whose major axis is laterally lateral when viewed from the front is formed. It was formed. The diameter D of the pipe line 2, the radius r of the concave curved surface 3 and the cutting angle θ of the cutting groove 5 are the same as those in the above embodiment. The length H in the major axis direction of the elliptical orifice-shaped nozzle 1 is 32.0 mm, and the length A in the minor axis direction is 1.
It is 4.3 mm.

Comparative Example FIG. 5 shows a comparative example. Since this spray nozzle is the same as that of the above-mentioned conventional example, description of its structure is omitted. In this case, the diameter D of the conduit 2, the radius r of the concave curved surface 3 and the cutting angle θ of the cutting groove 5 are the same as those in the above-described embodiment. However, the length H of the elliptical orifice-shaped nozzle 5 in the major axis direction is 36.0 mm, and the length A in the minor axis direction is 13.2 mm.

The spray nozzles of Examples 1 and 2 and the comparative example are mounted horizontally on the side wall W at a height of 4 m above the floor, and sprinkled at a flow rate of 400 liters / min to carry each flight distance [firefighting]. According to the law, effective watering (1.2 liter / min.
m2 or more) range]. At that time, the radial flow straightening plate 1 shown in FIG. 3 is provided inside the pipe 2 of each spray nozzle.
0 (aluminum extruded product) was incorporated to try watering. The results are shown in the watering pattern diagram of FIG. As can be seen from the water spray pattern diagram of FIG. 4, the spray nozzle of the comparative example has a flight distance of about 16.5 m for maintaining an effective water spray width.
In contrast, the spray nozzles of Examples 1 and 2 were able to fly to a distance of up to 18 m.

Such a watering pattern can be formed in a substantially rectangular shape so as to maintain substantially the same effective watering width (short side length) over almost the entire length in the flying direction, and the length in the long side direction can be increased. Therefore, even in a vast space, by installing the spray nozzles of Example 1 or Example 2 on the side wall W at equal intervals (almost the same interval as the effective sprinkling width) and horizontally mounting the spray nozzles, it is possible to provide a large space with a small number of spray nozzles. The water can be evenly cast over the entire area of the water, enabling efficient fire extinguishing. By the way, since only such a long throw nozzle is required to extinguish fire extinguishing water at a short distance from the side wall W to about 4 m, in this case, another short throw spray nozzle different from that is also used for supplementation.

Although the spray nozzle of the present invention is effective for fire extinguishing and fire prevention equipment, it can be similarly applied to, for example, spraying insect repellents, herbicides and the like.

[0013]

According to the liquid spray nozzle of the present invention, the cut groove is processed so as to be displaced to the upper side of the pipe axis, so that the flow of the liquid from the pipe along the concave curved surface of the liquid flows from the lower side. Since the upward momentum is stronger, the jet flow ejected from the orifice-shaped ejection port can be directed upward, and the flight distance can be extended even if it is mounted horizontally on a side wall or the like. Moreover, since the spray nozzle can be installed horizontally as described above, the installation can be performed very efficiently as compared with the operation of installing the spray nozzle at a predetermined upward angle.

[Brief description of drawings]

1A is a plan view of a liquid spray nozzle showing an embodiment of the present invention, FIG. 1B is a front view thereof, and FIG. 1C is a sectional view thereof.

2A is a plan view of a liquid spray nozzle showing another embodiment of the present invention, FIG. 2B is a front view thereof, and FIG. 2C is a sectional view thereof.

FIG. 3 is a perspective view of a current plate used for a liquid spray nozzle.

FIG. 4 is a watering pattern diagram showing a comparison of flight distances of liquid sprays of the present invention and a comparative example.

FIG. 5A is a plan view of a conventional liquid spray nozzle,
(B) is the front view, (c) is the sectional view.

[Explanation of symbols]

 1 Orifice type injection port 2 Pipeline 3 Concave curved surface 4 Dome-shaped concave (foss) 5 Cut groove 10 Rectification plate

Claims (2)

[Claims] 1. An orifice-type injection port comprising a dome-shaped concave portion (foss) formed by continuously forming a hemispherical concave curved surface at the outlet side end of a pipeline and a notch groove intersecting the tip of the dome-shaped concave portion. A liquid spray nozzle for forming a liquid spray nozzle, wherein the cut groove is provided so as to be shifted upward from a pipe axis. 2. The liquid spray nozzle according to claim 1, wherein a flow straightening plate is incorporated inside the pipe line.