JP3567019B2 - Liquid spray nozzle - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a liquid spray nozzle suitable for fire extinguishing and fire prevention equipment in a vast space such as an atrium space or in a tunnel, or an agricultural sprinkler.
[0002]
[Prior art]
As a liquid spray nozzle of this type, for example, as shown in FIG. 5, a dome-shaped recess (fog) 4 formed by continuously forming a hemispherical concave curved surface 3 at an outlet end of a pipe line 2; There is a so-called flat spray nozzle in which the orifice-shaped injection port 1 is formed into an elliptical shape such that the major axis thereof is in the horizontal direction when viewed from the front with a V-shaped notch groove 5 intersecting the tip of the orifice 4. .
[0003]
[Problems to be solved by the invention]
When the above-mentioned conventional spray nozzle is used, for example, horizontally mounted on a side wall of a fire extinguishing equipment installation place, the elliptical cut groove 5 is formed so that the center thereof coincides with the pipe axis x. 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 and are discharged almost horizontally forward from the orifice-shaped orifice 1. There is a limit. Therefore, in order to extend the flight distance of the water, the spray nozzle is attached to the side wall upward.
However, in order to attach the spray nozzle upward to the side wall, it is necessary to attach the spray nozzle while adjusting the angle using a goniometer or the like, which is a very troublesome operation. In particular, for example, a large number of spray nozzles are required for fire extinguishing equipment in a large space, so that the installation work requires a lot of time and trouble. Further, when mounting the spray nozzle on the wall surface, in the case of upward mounting, it is necessary to make a large cutout portion on the wall surface, and it is necessary to make the exposed length large, which impairs the aesthetic appearance.
The present invention has been made in view of such a problem, and an object of the present invention is to provide a liquid spray nozzle that can extend a flight distance of a liquid even when mounted horizontally.
[0004]
[Means for Solving the Problems]
According to the present invention, an orifice is formed by a dome-shaped concave (fossa) formed by continuously forming a hemispherical concave curved surface at an outlet end of a horizontal pipe, and a cut groove intersecting the tip of the dome-shaped concave. In the liquid spray nozzle forming the shaped injection port, the cut groove is provided on the concave curved surface shifted upward from a horizontal pipe axis. It is preferable that a flow straightening plate is incorporated inside the conduit.
[0005]
[Action]
If the cut groove is shifted upward from the horizontal pipe axis, when the liquid from the horizontal pipe flows along the concave curved surface, the upward momentum of the liquid flow from the lower side is higher than that from the upper side. Since the liquid flow becomes stronger than the downward momentum, the jet jetting from the orifice-shaped orifice after the liquid from the lower side collides with the liquid from the upper side exits obliquely above the horizontal.
[0006]
【Example】
Example 1
FIG. 1 is a sectional view of a liquid spray nozzle according to one embodiment of the present invention. This spray nozzle has an orifice type nozzle 1. Numeral 2 denotes a cylindrical conduit, and numeral 3 denotes a hemispherical concave curved surface continuously formed at the end of the conduit 2 on the outlet side. The conduit 2 and the concave curved surface 3 form a dome-shaped concave (flush) 4. The orifice-shaped orifice 1 is formed by cutting a notch groove 5 having a cross-sectional groove shape at the tip of the dome-shaped concave or 4 so as to cross the tube axis X. At this time, the notch groove 5 is By processing so as to be shifted upward, the orifice-shaped injection port 1 is formed so as to have a semi-elliptical shape whose major axis coincides with a line intersecting the tube axis X when viewed from the front. Reference numeral 6 denotes a screw provided on the outer periphery of the inlet side end of the pipeline 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 cut angle θ of the cut groove 5 is 66 °. The length H of the semi-elliptical orifice-shaped injection port 1 in the major axis direction is 35.3 mm, and the length A in the minor axis direction is 13.0 mm.
[0007]
At this time, when the liquid spray nozzle is horizontally attached to the side wall and water is sprayed, when the water from the pipe 2 flows along the concave curved surface 3, the upward force of the water flow B from the lower side is higher from the upper side. Therefore, the water can be discharged from the orifice-shaped nozzle 1 approximately 10 ° obliquely upward from the horizontal so that the flight distance can be increased.
When the amount of water was the same, almost the same flight distance could be secured as in the case where the conventional spray nozzle shown in FIG.
Needless to say, when the spray nozzle having the above configuration is attached to the side wall upward, the flight distance can be further extended as compared with the conventional spray nozzle having the upward attachment.
[0008]
Example 2
FIG. 2 shows another embodiment. In this embodiment, the cut groove 5 is provided above the tube axis X and shifted further above the case of the above embodiment, so that the elliptical orifice-shaped nozzle 1 whose long axis is in the horizontal direction when viewed from the front. It was formed.
The diameter D of the pipe 2, the radius r of the concave curved surface 3, and the cut angle θ of the cut groove 5 are the same as those in the above embodiment. The length H of the elliptical orifice-shaped injection port 1 in the major axis direction is 32.0 mm, and the length A in the minor axis direction is 14.3 mm.
[0009]
Comparative Example FIG. 5 shows a comparative example. Since this spray nozzle is the same as that of the above-mentioned conventional example, the description of its structure is omitted. In this case, the diameter D of the pipe 2, the radius r of the concave curved surface 3, and the cut angle θ of the cut groove 5 are the same as those in the above embodiment. However, the length H in the major axis direction of the elliptical orifice-shaped injection port 5 is 36.0 mm, and the length A in the minor axis direction is 13.2 mm.
[0010]
Each of the spray nozzles of Example 1, Example 2 and Comparative Example was mounted horizontally on the side wall W at a height of 4 m above the floor, and water was sprayed at a flow rate of 400 liter / min. Effective watering (1.2 liter / min.m2 or more) range]. At that time, a radial flow straightening plate 10 (aluminum extruded product) shown in FIG. 3 was incorporated into the inside of the pipe line 2 of each spray nozzle to spray water. The result is as shown in the watering pattern diagram of FIG.
As can be seen from the watering pattern diagram of FIG. 4, the flight distance for maintaining the effective watering width was about 16.5 m in the spray nozzle of the comparative example, whereas the spray distance of 18 m according to the spray nozzles of Example 1 and Example 2 I was able to fly far.
[0011]
Such a watering pattern can be formed in a substantially rectangular shape that maintains 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 large space, the spray nozzles of the first or second embodiment are arranged at equal intervals (approximately the same as the effective watering width) on the side wall W and are mounted horizontally, so that the number of spray nozzles is as small as possible. It can evenly cast water over the entire area, enabling efficient firefighting and sprinkling. By the way, since only the long-casting nozzle lacks the fire-extinguishing sprinkling at a short distance from the side wall W to about 4 m, in this case, a supplementary short-cast spray nozzle is supplemented.
[0012]
The spray nozzle of the present invention is effective for fire extinguishing and fire prevention equipment, but can also be similarly applied to spraying insect repellents / pesticides, herbicides, and the like.
[0013]
【The invention's effect】
According to the liquid spray nozzle of the present invention, the cut groove is processed so as to be deviated upward from the horizontal pipe axis, so that the flow along the concave curved surface of the liquid from the horizontal pipe line is the flow of the liquid flow from below. Since the upward momentum is set to be stronger, the jet jetting from the orifice-type nozzle can be directed upward, and the flight distance can be extended even when the jet is mounted horizontally on a side wall or the like. Moreover, since the spray nozzle needs to be mounted horizontally as described above, the spray nozzle can be mounted very efficiently as compared with the work of mounting at a predetermined upward angle.
[Brief description of the 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 according to 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.
5A is a plan view of a conventional liquid spray nozzle, FIG. 5B is a front view thereof, and FIG. 5C is a sectional view thereof.
[Explanation of symbols]
1 Orifice-shaped nozzle 2 Pipe line 3 Concave curved surface 4 Dome-shaped concave
5 Notch groove 10 Rectifier plate

Claims (2)

An orifice-shaped orifice is formed by a dome-shaped recess (fossa) formed by continuously forming a hemispherical concave curved surface at the outlet end of a horizontal conduit, and a cut groove intersecting the tip of the dome-shaped recess. Wherein the cut groove is provided on the concave curved surface displaced upward from a horizontal pipe axis. 2. The liquid spray nozzle according to claim 1, wherein a straightening plate is incorporated inside the conduit.

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