JP3140691B2 - Spray nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray nozzle used for spraying water in a greenhouse for growing vegetables and the like.

[0002]

2. Description of the Related Art Conventionally, as a nozzle capable of obtaining fine spray, for example, a spray liquid and air are mixed in a nozzle body,
There is a spray nozzle in which a pair of two-fluid jet heads for jetting a mixed spray liquid and air from a nozzle of an orifice are opposed to each other. According to such a two-fluid spray nozzle, it is possible to obtain fine spray, but since it has a gas-liquid mixing mechanism, its configuration is complicated and extremely expensive, and it is used for spraying pesticides. Doing it does not conform to the actual situation. In addition, an air compressor for feeding compressed air must be separately provided, and air piping must be provided for each nozzle.

[0003] On the other hand, FIG. 10 shows a spray nozzle in which a pair of one-fluid jet heads for jetting only a spray liquid are opposed to each other. In the spray nozzle 51 shown in the figure, a pair of branch pipes 53, 53 are attached to the tip of a nozzle body 52.
The distal ends of the branch pipes 53 are arranged to face obliquely inward. A core 70 is attached to the tip of each of the branch pipes 53, 53, and an orifice 56 is provided.
And is fixed with a spout cap 60 integral with the squirt cap. On the outer peripheral surface of these cores 70, a spiral groove 71 for turning the spray liquid from the branch pipe 53 and introducing it into the jet head cap 60 is formed. And at the center of each orifice 56,
A round hole-shaped injection port 57 is provided.

[0004] Such a spray nozzle 51 is attached, for example, at an appropriate interval to a liquid feed pipe provided in an agricultural greenhouse, and is used for water spray for controlling the temperature in the greenhouse. You. In that case, the two spray flows P injected from the orifices 56, 56 of each spout cap 60, 60
By colliding r and Pr, finer mist can be obtained.

[0005]

However, in the case of the conventional spray nozzle 51, the spray flows Pr and Pr ejected from the orifices 56 have a hollow conical pattern. , Pr is difficult to align well, and if the position is slightly deviated, the portion that cannot be collided becomes a large amount of coarse particles because the outer peripheral portion has a conical pattern with a large amount of water. It splatters. Since such coarse mist particles are unlikely to float in the air, the mist particles may not reach far and may not be efficiently humidified. Alternatively, the area around the nozzle may be excessively wet locally, which may adversely affect the crops in the greenhouse or may waste the spray liquid unnecessarily.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a spray nozzle having a simple structure and capable of obtaining fine spray.

[0007]

In order to achieve the above object, a spray nozzle according to the present invention is provided with orifices at a pair of jet heads arranged diagonally inwardly facing each other, and a spray jet from each orifice is provided. A spray nozzle adapted to impinge the liquid, wherein each orifice has a single bulge portion in which a surface on the inner side of the jet bulges and a surface on the outer side of the jet head is recessed . further forming a protrusion protruding toward, it is a configuration bored a nozzle hole at a substantially central portion of the projecting portion.

Further, in the above configuration, each opposing jet head is
It is located at the position where the fountain flow immediately before spraying and atomizing collides from each nozzle.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan sectional view showing a spray nozzle according to an embodiment of the present invention, FIG. 2 is a front view showing the spray nozzle, FIG. 3 is a side view mainly showing the spray nozzle,
FIG. 4 is an exploded view of the spray head of the spray nozzle. In each figure, a spray nozzle 1 according to this embodiment is shown.
A pair of jet heads 4 and 4 are provided integrally on one end side of a nozzle body 2 via branch pipes 3 and 3. These jet heads 4 and 4 are arranged to face each other in a state of being inclined inward by the angle θ with respect to the intended spray direction (the direction of arrow S). Here, the angle θ is set to, for example, 60 degrees.

An orifice 6 is fixed to the tip of each of the jet heads 4 and 4 by a jet head cap 10 and an O-ring 5, respectively. The orifice 6 and the liquid feed pipe 20 communicate with each other through a liquid passage 12 in the nozzle main body 2, a liquid passage 11 in the branch pipe 3, and a liquid passage in the nozzle holder 18. At the other end of the nozzle body 2,
A union cap 13 for connection to a nozzle holder 18 is mounted, and is screwed to a nozzle holder 18.
The nozzle holder 18 is wound around and fixed to the liquid feed pipe 20.
9. A filter plate 14 sandwiched between O-rings 30 and 31 is provided between the nozzle body 2 and the nozzle holder 18.
Is installed. On one side of the filter plate 14, a valve body 15 for closing the insertion tube 19 of the nozzle holder 18 is provided with a screw 1.
7, and a conical coil spring 16 is fixed to the other surface of the filter plate 14 with screws 17.

As shown in FIGS. 5 to 7, the orifice 6 is formed by pressing a stainless steel plate having a thickness of, for example, 0.3 mm as a raw material. First, the injection port 7 is punched out of a flat stainless steel plate. The injection port 7 is, for example, 0.3 mm in the longitudinal direction of a bulging portion 9 described later.
mm in the width direction (direction perpendicular to the longitudinal direction).
It is formed in a 4 mm square hole. The swelling portions 9 are formed in an array form in a bottom view by pressing around the injection port 7. The bulging portion 9 is formed such that the surface on the inner side of the jet head 4 bulges and the surface on the outer side of the jet head 4 is recessed as a concave streak 8. At the center of the bulging portion 9, a protruding portion 21 further protruding inward of the jet head 4 is formed by pressing. The width of the protrusion 21 is, for example, 0.3 mm.
In this case, the injection port 7 is located at the center of the protrusion 21 in the longitudinal direction. Then, the bulging portion 9 of the stainless steel plate
Is punched into a disk shape, and the orifice 6 is obtained.

The fountain flow P immediately after the jet from the orifice 6
e is a flat jet pattern (thickness T is, for example, 0.3 to 0.4 mm) along the concave streak 8 as shown in FIGS.
Degree), and the flow is very strong and large and transparent. Even if the fountain flow Pe does not collide with another fountain flow or the like, the fountain flow Pe is then atomized to become a spray flow Pf. This spray flow Pf also has a flat jet flow pattern along the concave stripes 8. Further, although the amount is small, the spray tributary stream Ps is also jetted separately from the fountain stream Pe on the way. Incidentally, a configuration in which a contact plate (not shown) is brought into contact with the inside of the bulging portion 9 of the orifice 6 in the jet head 4 is also conceivable, but in this case, the fountain flow Pe
Is extremely small and immediately becomes the spray flow Pf. In this case, the spray flows Pf are caused to collide with each other, and the atomization efficiency is not improved.

As shown in FIGS. 1, 2 and 4, the orifice 6 has an arrangement in which a concave streak 8 on the front surface is arranged outside the nozzle and a bulge 9 on the back surface faces the liquid passage 11 side. To be attached to each of the jet heads 4 and 4, respectively. These orifices 6, 6 are connected to the jet center lines e ₁ , e ₁ ,
e ₂ with respect to a plane including both of them, the longitudinal direction of the concave streak 8 is arranged to be inclined by an angle α in the opposite direction, and the bulging portion 9 is fitted into the positioning groove 22 at the tip of the jet head 4. Positioned and fixed. In this case, the angle α is, for example, 50
It is set every time.

Here, the angle α (see FIG. 2) is 5
The temperature is not limited to 0 degree, and may be appropriately selected according to conditions such as the viscosity of the spray liquid, the discharge pressure, and the friction loss in the pipe, so that fine mist can be obtained. However, the arrangement of the orifices 6, 6 so that the longitudinal direction of the concave streak 8 is substantially parallel (angle α ≒ 0 degree) to a plane including both the jet center lines e ₁ and e ₂ is a fountain. It is difficult to cause the streams Pe to reliably collide with each other, and the edge of the spray stream contacts the tip of the nozzle body 2, which is not preferable. Note that the jet heads 4, 4 are arranged in positions and directions in which the fountain flows Pe, Pe jetted from the jet ports 7, 7 of the orifices 6, 6, collide near the position M (see FIG. 6) immediately before atomization.

The spray nozzle 1 having the above-described structure is used, for example, for humidifying a greenhouse 29, as shown in FIG. In the figure, reference numeral 23 denotes a spray liquid 27 stored in a water storage tank 25.
Pump for sucking and discharging the pump, 24 is a motor for driving the pump 23, 26 is a control panel for driving and controlling the motor 24 so as to maintain the discharge pressure of the pump 23 at a predetermined value, and 28 is connected to the discharge side of the pump 23. It is a discharge pipe. In this case, the discharge pressure of the pump 23 is controlled to, for example, about 20 kg / cm ² G. In the middle of the discharge pipe 28, a plurality of liquid feed pipes 20 are branched and connected. These liquid supply pipes 20
Extends into the greenhouse 29, and a plurality of spray nozzles 1 are attached at intervals of, for example, 2 m.

The spray operation of the spray nozzle 1 will be described with reference to FIGS. 1 to 3 and FIGS. 6 to 9.
First, the spray liquid in the liquid feed pipe 20 pressure-fed from the pump 23 enters the liquid passage 12 of the nozzle body 2 through the insertion pipe 19 of the nozzle holder 18, and further passes through the liquid passage 11 of the branch pipe 3. It is led to each jet head 4,4. Then, the spray liquid is once diverted to both sides by the presence of the bulging portion 9 and the protruding portion 21 of the orifice 6 in the jet head 4 and then jetted from the jet port 7. At this time, the fountain flows Pe, Pe immediately after the ejection
6 becomes an extremely thin pattern along the longitudinal direction of FIG.
And FIG. 7)

That is, in the spray nozzle 1, as shown in FIG. 8, the fountain flows Pe, Pe from the respective jet heads 4 are flat, so that they can reliably collide with each other. In addition, the fountain flows Pe, Pe collide at the position M (see FIG. 6) immediately before the atomization, which has a strong momentum, and violently vibrates during the collision. As a result, the fountain flows Pe, Pe are very finely atomized and become the fine spray flow Pm. This fine spray flow Pm is a fan-shaped pattern in plan view centering on the intended spray direction (indicated by the arrow S direction), is almost an elliptical pattern Pma in front view (CC arrow direction), and is relatively uniform. It is. In addition, since the fountain flows Pe, Pe have a larger amount of water than their surroundings, a large amount of fine spray flow Pm is obtained. For these reasons, the fine mist generated by the spray nozzle 1 stably floats in the air far away. Therefore, the inside of the greenhouse 29 can be efficiently and quickly humidified, and the spray liquid is not wasted.

[0018]

As described above, according to the spray nozzle of the present invention, a single swollen portion is formed in each orifice so that the surface on the inner side of the spray head protrudes and the surface on the outer side of the spray head recesses. The swelling portion is formed with a protruding portion further protruding inward of the spray head, and a simple configuration is adopted in which a nozzle is formed at a substantially central portion of the protruding portion. Can be provided at low cost. In addition, a flat jet having a large amount of water is ejected from the orifice nozzles having such a configuration at the central portion. That is, two flat jets can reliably collide with each other, and a large amount of fine spray can be easily obtained.

Further, since the fountain flow immediately before atomization ejected from each噴頭each nozzle hole of the opposing are then placed in a position to collide, vigorously collide fountain flow immediately before atomization ejected from each nozzle hole Can be done. Therefore, each fountain flow can be vibrated violently at the time of collision, and as a result, extremely fine spray can be obtained. That is, the present invention can provide a spray nozzle which is extremely useful, for example, for humidification.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing a spray nozzle and a liquid feed pipe according to an embodiment of the present invention.

FIG. 2 is a front view showing the spray nozzle.

FIG. 3 is a side view showing the spray nozzle and a liquid feed pipe.

FIG. 4 is an exploded view of a spray head portion of the spray nozzle.

5A and 5B show an orifice used in the spray nozzle, FIG. 5A is a plan view thereof, and FIG. 5B is a bottom view thereof.

FIG. 6 is a sectional view of the orifice in FIG.

FIG. 7 is a sectional view of the orifice in FIG.

FIG. 8 is an explanatory view of a spray state by the spray nozzle as viewed on a plane.

FIG. 9 is a usage diagram showing an example in which the spray nozzle is used in a greenhouse.

FIG. 10 is an explanatory view showing a spray state by a conventional spray nozzle as viewed on a plane.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spray nozzle 2 Nozzle main body 3 Branch pipe 4 Spout head 6 Orifice 7 Spout 8 Concave stripe 9 Swelling part 21 Projection part M Position just before atomization Pe Fountain flow Pm Fine spray flow

Claims (2)

(57) [Claims] An orifice is provided at each of a pair of jet heads disposed obliquely inward and opposed to each other, so that a spray liquid ejected from each orifice collides with the spray nozzle. The bulging surface forms a single bulging portion in which the surface on the outer side of the jetting head is recessed, and the bulging portion has a protruding portion further protruding inwardly of the jetting head. A spray nozzle characterized by having a hole. 2. The spray nozzle according to claim 1, wherein each of the opposing jet heads is disposed at a position where the jet flows immediately before being atomized from the respective nozzles collide.