JP3140457B2 - spray nozzle - Google Patents

Abstract

A nozzle to discharge liquid fertilizer, growth retardant, insect sprays, orchard spray material and the like in a lateral pattern in an efective manner so that a substantial equal quantity of liquid material is discharged in each increment of the path being transversed by the nozzle. In one embodiment a nozzle (10) is provided with a discharge passageway (34), a downwardly opening, inverted U-shaped extension (36) of the passageway (34) and a curved blade diffuser (56) in the inverted U-shaped extension (36) to break up the liquid flow into droplets. In another embodiment, an additive injector (92, 94, 96) is incorporated into the nozzle (80) which enables a controlled quantity of liquid material to be injected into the main flow of liquid being discharged with the diffuser (90) effectively serving as a mixer for the additive and the liquid discharged from the nozzle (80).

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray nozzle, and more particularly, to a nozzle capable of uniformly spraying a liquid when discharging a liquid material, no matter how the spray pattern is changed. This nozzle is adapted to various methods of advancing the nozzle while supplying the pressurized liquid and discharging in a generally horizontal direction, and effectively uses liquid fertilizer, growth inhibitor, insecticide, orchard spray material, etc. Has a high utility above. In one embodiment of the invention, the nozzle comprises a discharge outlet tube, an inverted U-shaped portion which opens downwardly at the extension of the outlet tube, and an inverted U-shaped portion.
It consists of a diffusion part with a curved flat plate inside the character part,
With these, the liquid flow is diffused and changed into droplets, which are discharged in the lateral direction, so that the liquid can be sprayed almost uniformly regardless of how the transverse direction of the nozzle is changed. Further, in another embodiment of the present invention, a predetermined amount of additive is injected into the liquid flow of the main agent by incorporating an additive injector into the nozzle, and the mixed liquid is effectively mixed by the diffusion unit from the nozzle. It is possible to release.

Prior art Various known nozzles release irrigation, fertilizer from a mobile vehicle equipped with an assembly consisting of a tank and a pump, and spraying trees, orchards, insecticides, growth inhibitors, etc. It is used for various purposes such as use. Also, U.S. Pat.
No. 4,648,558, Mar. 10, 1987, a sprinkler assembly discloses a dispensing nozzle with a diffuser to obtain a spreading band where the amount of liquid discharged to the surface is always equal. While this patent and the prior art cited therein relate to various sprinkler or spray nozzles, the prior art has not yet disclosed the nozzle of the present invention.

SUMMARY OF THE INVENTION A first object of the present invention is to provide, in a spray nozzle, a main body having a built-in outlet pipe through which a liquid flows under pressure, an inverted U-shaped part which opens downward at an extension of the outlet pipe, and an inverted U-shaped part Has a diffusing flat plate adjacent to the outer end of the part, which disperses the liquid flow into droplets, discharges the droplets while moving the nozzle, and almost no matter how the spray band created by the nozzle is changed It is an object of the present invention to provide a spray nozzle characterized in that the same amount of discharge material is supplied to the nozzle.

A second object of the present invention is to install two nozzles of the present invention on a vehicle, facing each other, and to carry out lateral spraying by means of a spray spraying band which emits the same amount of liquid throughout the spraying area while moving forward. The conventional boom type spraying method, that is, a method of extending a boom 20 feet long from both sides of a moving vehicle equipped with a tank and a pressurizing pump and installing a plurality of nozzles on the boom,
The object of the present invention is to improve the method of the present invention to eliminate the boom or to replace the entire boom type spraying method with the method of the present invention.

A third object of the present invention is to provide a nozzle connecting an injection structure, injecting an additive material into a liquid flow of an outlet pipe, mixing the additive material with a main agent passing through the nozzle by a flattened diffusion part, and forming a homogeneous mixture. It is an object of the present invention to provide a nozzle for connecting an injection structure, characterized in that a liquid mixture is formed and the mixed liquid is discharged by the method described above.

A fourth object of the present invention is to install the nozzle described above for the outside of a truck, and to provide a growth inhibitor around the passing road,
Spreading herbicides etc. to reduce the burden of weeding, and spraying orchard trees with the nozzle angle upward, especially by spraying on the back side of the leaves of the orchard trees, more effective use of tree spray material It is to provide a way to do it.

A fifth object of the present invention is to provide a computer control method for measuring organic substances on the sprayed ground since the additive is discharged from the nozzle without any pipe pressure as in the case of a spraying boom in a nozzle with an injection structure. It is an object of the present invention to provide a nozzle with an injection structure, characterized in that the injection agent can be used for infrared geodesy according to the above.

The above and further objects and advantages should become apparent as the detailed description and claims of the structure and operation of the nozzle of the present invention are provided herein with reference to the accompanying drawings. . The same part numbers are used throughout the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevational view of a spraying device as viewed from the rear,
The two nozzles of the present invention are shown installed in the apparatus, discharging spray swatches laterally from both sides of the vehicle.

 FIG. 2 is a perspective view of the nozzle of the present invention.

 FIG. 3 is an elevation view from the end of the nozzle.

FIG. 4 is a longitudinal sectional view generally taken along line 4-4 in FIG.
3 shows details of the nozzle structure.

FIG. 5 is a longitudinal sectional view of the nozzle taken along line 5-5 in FIG.

 FIG. 6 is a cross-sectional view taken along line 6-6 of FIG.

FIG. 7 is a perspective view of a nozzle incorporating an additive injection structure.

FIG. 8 is a longitudinal sectional view taken along line 8-8 of FIG. 7 and shows details of the structure of one embodiment of the present invention.

FIG. 9 is a cross-sectional view taken along line 9-9 of FIG. 8, showing further details of the construction of the additive injection nozzle.

BEST MODE FOR CARRYING OUT THE INVENTION The nozzle 10 is shown in FIGS. In FIG. 1, a pair of nozzles 10 are mounted on a tee joint 12 at the rear of a vehicle such as a tractor on which a spray liquid tank 16 is mounted, and liquid is discharged from both sides of the tractor 14 to a ground surface 18 in a lateral direction. Is shown. Tank 16 stores liquid and pumps (not shown)
This supplies the pressurized liquid for supply to the Qi joint 12 and the nozzle 10. The liquid material discharged from the nozzle 10 spreads in the lateral direction as a spray spreading band 20, and the spray bands overlap inside. With this nozzle, the conventional method eliminates the need for a boom that extends as much as 20 feet and protrudes laterally from both sides of the tractor and a large number of nozzles installed on it. A single pair of nozzles 10 mounted on the can replace the entire conventional assembly. The nozzle 10 comprises a ring-shaped body 22 with a thread 24 at the outer end of the body,
Can be mounted at the end of 12 or other pipes. The body 22 has a thicker flange 26 with a flat portion 28 on which a wrench is applied to secure the nozzle 10 in the correct position of the Qi fitting. As shown in FIG. 4, the distal end of the body 22 is inserted into the Qi joint, but the body has a large diameter cavity or run-out tube 30 which runs a considerable distance and terminates at a shoulder 32, followed by a run-out tube 30. An outlet pipe 34 having a ring structure smaller in diameter than the pipe 30 extends further from the center of the shoulder 32.

There is also an extended portion 36 extending vertically from the body 22, originally an inverted U-shaped portion, having a pair of walls 38 and 40 facing each other, these two walls being separated at the bottom edge. However, the upper edge is connected by a belly plate 42, and an inner wall 44 of the belly plate 42 is an extension of the ceiling surface of the outlet pipe 34.

As shown in FIG. 3, each parallel inner surface 46 of the walls 38 and 40 is in contact with the side edge portion of the outlet pipe 34, and the lower edge 48 of the walls 38 and 40 is the lower edge of the outlet pipe 34. It extends further below. As shown in FIG. 3, each of the wall surfaces 46 is parallel to each other, with a space between them equal to the diameter of the outlet pipe 34, and the lower edge 48 is located significantly below the bottom portion of the outlet pipe 34. Thus, an inverted U-shaped flow path is formed on the bottom surface of the extension portion 36 and has an inner wall serving as a slot-shaped outlet pipe 50. The slot-shaped outlet pipe 50 occupies a position perpendicular to the outlet pipe 34, while the wall 52 defines the bottom of the outlet pipe with a small width, forming a cylindrical outlet pipe 34 of relatively short length. ing.

The terminal discharge portion composed of the walls 38, 40 and the abdominal plate 42 is located substantially perpendicular to the longitudinal axis of the outlet tube 34, and the corner 54 at the bottom is rounded. A diffusion portion 56 is attached to the discharge end of the nozzle, and a mounting plate 58 at the upper end is inserted into a slot-like cavity 60 of the abdominal plate 42 and fixed with a pin or other fastener 62, but this portion is a fastener. It can be assembled or removed or replaced.

The diffusion portion 56 has a curved flat plate structure, and is disposed substantially vertically and has an arc-shaped curved edge facing the outlet pipe 34.
The lower flat corner portion 68 of the flat plate 64 has an arcuate curve substantially equal to the curve of the edge 54 at the end of the wall 38, 40 as shown in FIG. Flat plate 64
There is an upper portion 70 that tapers from the wide edge adjacent to the curved edge 66 and is narrow at the diffuser end discharge, the shape of this taper is triangular,
64 continues to taper from the leading edge to the trailing edge. As shown in FIGS. 5 and 6, the curved edge 66 and the major portion of the flat plate 64 are parallel to each other at a distance from the inner surfaces 46 of the walls 38 and 40, respectively. There is. FIG. 5 shows the tapered shape of the upper portion 70 of the diffusion section 56.

The nozzle can be made from various materials such as metal, plastic, and may be made with different dimensions. The fixed diffuser allows the liquid flow passing through the outlet pipe 34 to be effectively diffused to produce a uniform spray application zone 20. Currently, two sizes of nozzles have been used successfully, one with a spraying capacity of 16-1 / 2 gallons per minute and a discharge tube diameter of .375 ", and the other with a spraying capacity per minute. 22 gallons, outlet pipe diameter .437 ″. The ratio of diameter to number of gallons released per minute should be approximately constant, and the nozzle is capable of discharging a swath about 20 feet on each side of the tractor, and can therefore be replaced by two conventional 20 'booms . This nozzle can be used to spray fertilizers and other various materials on the surface of the ground, and has sprayed a growth inhibitor on road surroundings for the purpose of suppressing plant growth and reducing mowing work. As a result, grass and weeds have been kept at the desired height, effectively saving time and capacity. In the case of a growth inhibitor, a nozzle can be installed on the side surface of the truck and run at a considerable speed along the road periphery. The nozzle can also be used to spray the orchard by pointing upwards at an angle that matches the height characteristics of the orchard tree.

A nozzle 80 with an additive injector is shown in FIGS.
This is combined with the body 82, the outlet tube 84, the walls 86 and 88 forming an extension of the body, and the inner surfaces of the walls 86, 88 in the same manner as the structure shown in FIGS. Diffusion part 90. In this embodiment, the main body 82 has a cylindrical outer cavity having a plurality of radially disposed outlet pipes 94, that is, a manifold 92, and the outlet pipe 94 connects the outside of the manifold 92 to the outlet pipe 84. ing.
The outlet pipe 84 is the outlet pipe 34 of the embodiment shown in FIGS.
Is slightly longer than The cylindrical manifold ring 96 tightly surrounds and captures the manifold 92, but the inner surface of the ring has a space 98 that can rotate between it and the manifold 92, and communicates with all the radial outlet pipes 94. Since the annular manifold space is formed, it is possible to inject the liquid material from the manifold space 98 through the outlet pipe 94 to the outlet pipe 84 that runs in the vertical direction. Fitting 100 with thread is manifold ring 96
And the inner end of the joint communicates with the manifold space 98. A flexible hose 104 is connected to the extension 102 of the joint 100 in a sealed manner to discharge the additive material into the manifold space 98. Manifold 92 on the surface of body 82
A pair of O-rings are installed adjacent to each other and spaced apart from each other to seal the manifold ring 96 against the manifold 92 to prevent the additive material from leaking from the manifold space 98 and to prevent the manifold from leaking. The angle at which the ring 96 can be set as desired, and if necessary, the frictional engagement between the O-ring 106 and the inner surface of the manifold ring 96 is released, and the manifold ring 96 is moved vertically to disassemble and wash. Making it possible.

The thread of the nozzle 80 and the supply pipe or Qee joint are joined in the same manner as shown in FIGS. The structure of the inverted U-shaped lead-out tube in which the walls 86 and 88 define the contour and the structure of the diffusion mixing section 90 are the same as those shown in FIGS.

This type of nozzle is particularly effective when it is intended to measure organic matter in soil by performing infrared aerial geodetic measurement on an area where fertilizer or other liquid material is to be sprayed.
In this type of work, the amount of additive material can be changed according to computer-controlled instructions in response to geodetic measurements, but this is usually done using the boom described above. Spray vehicles run at relatively high speeds in spray areas,
Because the additive material that has been displaced moves outward in the boom and is discharged only after reaching each spray nozzle, a time lag occurs between the time when the computer instructs the dispensing and the time when the dispensing is performed. In addition, an error occurs in the usage rate determined by the geodesic. With the additive injector of the present invention, the additive is actually injected into the nozzle and the amount of additive injected into the spray liquid can be accurately controlled, so that the change in the ratio between the additive and the spray liquid is extremely accurate. It is possible to mix the additives in the upper diffusion section 90 while injecting the additives. The manifold ring completely rotates around the body, so the ring can rotate 360 ° to take the nozzle to any position, and the supply pipe can be placed at any position on the circumference . Also, the manifold ring can be easily removed for cleaning and repair.

As described above, the organic matter in the soil is measured by infrared geodesic to determine whether a herbicide or other additive is needed. However, in the boom spraying method, chemicals are injected into the suction side of the pump, and the boom travels at high speed, so that a considerable time lag occurs before the change ratio is transmitted to the boom nozzles, which is quite inaccurate. The inventive nozzle injects the additive directly into the nozzle and immediately executes the change in the chemical ratio as directed by the control computer.

In the embodiment shown in FIGS. 7 to 9, the flowing water flows from the large cavity of the nozzle to the small hole, that is, the outlet pipe 84, so that the flow velocity rapidly increases and the pressure in the nozzle hole decreases. When using this nozzle, the water pressure drops from 40 PSI in the nozzle cavity to almost 0 PSI when passing through the injection tube 94. Therefore, the medicine can be injected by a relatively simple low-pressure pump. In addition, due to the structure of this nozzle, the injected chemical spreads from corner to corner in the water flow via the outlet pipe 94 and is more thoroughly mixed. The diffuser distributes the running water evenly along the narrow band, and additionally mixes the chemicals better as the water stream passes through the diffuser. When the manifold ring is in place, the drug first enters the drug injector, passes through the injection tube, further into the manifold, and finally into the water stream. Although this structure has some characteristics as a Venturi tube, it is not a true Venturi because it does not have a convex compressor unique to the Venturi system. This nozzle is not designed to be self-supplying the drug to be injected, but if the drug container is raised above the nozzle, gravity and a very slight vacuum will cause the nozzle to become self-sufficient.

The fact that the structure of the outlet pipe, that is, the discharge portion from the hole to the nozzle end, is in an inverted U-shape is extremely important in producing an accurate spray band from the discharge liquid. The width of the outlet is equal to the diameter of the outlet tube, i.e. the hole, but the length of the outlet may vary. The radius of the leading edge of the divergence plays a role in pooling the running water, but not all radii work or act as a perfect semicircle. The width of the diffusion portion is equal to the diameter of the outlet pipe, but the width of the diffusion portion tapers upward from the rear edge, and the upper edge has two steps, so that when the flowing water exits the nozzle, this portion is evacuated. This creates turbulence in the water stream, creating droplets that can enhance the effects of scattering and reach. Regarding the function of the diffusion unit, when the liquid collides with the curved surface 66 of the diffusion unit 56, the part that is in contact with the curved surface is guided downward around the curved surface of the diffusion unit, discharged to the rear of the nozzle and discharged to the opposite side Promotes overlapping spray spray bands from the nozzle. However, the function of the radius or curve of the diffuser is not limited to this. A portion of the liquid that is in contact with the curved surface of the diffuser goes downward, while portions on both sides of the diffuser attempt to continue linearly beyond the diffuser.

Since the liquid blocked at this portion flows in two directions at high speed, a dividing effect is created between the two. In other words, this dividing effect is created by the liquid flowing downward and the liquid flowing in a circular direction around the surface of the diffusion part, and by this, a part of the liquid passing on both sides of the diffusion part is also downward. Gravitate.

The combination of the size and depth of the diffusion portion radius, the width of the diffusion portion, and the size of the holes determines the form of the liquid spreading zone. By changing this combination, the spreading band can be changed from one-sided or both-sided spreading to heavy.

For nozzles with a .375 ”outlet, the radius of the leading edge of the diffuser is .250”, and the lower end is 50 ° to vertical.
It is inclined at an angle of 60 ゜. The thickness of the flat plate is .1 at the leading edge.
09 ″, the trailing edge of the tapered portion is .020 and the trailing edge radius is .406. The overall length of the diffuser mounting portion is .480, and the overall height from the upper edge to the lower edge of the diffuser is .925. The space between the inner surfaces of the walls is .375, which is equal to the diameter of the outlet tube, and the space between the diffuser surfaces is .132 "at the lower end. The thickness of the wall 52 is .10, and the overall length of the discharge portion 36 of the nozzle is 1.450. In the figure, the upper surfaces of the walls 38 and 40 are notched, and the lower edge curves inward, but this is not critical to the operation of the nozzle.

The preferred material for the nozzle is stainless steel,
A preferred material for the diffuser is a plastic material such as nylon. This nozzle can be used when various materials are used in the lands around roads, power lines, orchards, and cultivated lands where cultivation or cultivation is performed, and uniform spraying is desired even if the spraying splay zone is changed. .

The description herein should be regarded as illustrative of the principles of the present invention. In addition, many modifications and variations will readily occur to those skilled in the art and, thus, it is not desired that the present invention be limited to the structures and operations illustrated or described herein, but to modifications and equivalents. All are covered by the patent scope of the present invention.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05B 1/00-3/18 A01C 23/00 A01M 7/00 B05B 7/00-7/32 A01G 25/00

Claims (17)

(57) [Claims] 1. A spray nozzle for spraying a pressurized liquid, comprising: a main body having a built-in outlet pipe connected to a source of pressurized liquid; and a pair of walls parallel to each other with a space substantially equal to the diameter of the outlet pipe therebetween. The wall portion is an upper edge connected by a belly plate portion, a lower edge forming a slot-like structure and opening, and a position away from the outlet pipe. A diffusion portion located between the ends of the wall portion, wherein the diffusion portion is a flat plate attached and fixed from the abdominal plate portion of the extension portion, and each of the inner surfaces of the wall portion separated from each other. The flat plate extends downward at equal intervals and ends substantially in line with the lower end of the wall portion, the flat plate has a front edge curved in an arc shape facing the outlet pipe, and a pool of flowing water is provided in front of the flat plate. Then, the flowing water is separated by the flat plate into the flat plate. It is characterized in that almost the same amount of liquid per unit length can be sprayed over the entire area of the spray width even if the amount of liquid supplied in the lateral direction is changed to droplets between the walls and the supply amount of liquid in the lateral direction is increased. Spray nozzle attached to a pressurized liquid source. 2. A spray nozzle for spraying a pressurized liquid, comprising a main body having a built-in outlet pipe connected to a source of the pressurized liquid, and a pair of walls parallel to each other with a space substantially equal to the diameter of the outlet pipe therebetween. The wall portion is an upper edge connected by a belly plate portion, a lower edge forming a slot-like structure and opening, and a position away from the outlet pipe. A diffusion portion located between the ends of the wall portion, wherein the diffusion portion is a flat plate attached and fixed from the abdominal plate portion of the extension portion, and each of the inner surfaces of the wall portion separated from each other. Extending downward at equal intervals, the diffusion section has a leading edge curved in an arc shape facing the outlet pipe, and pools flowing water in front of the diffusion section. To the droplets, and the diffusion part The trailing edge is tapered upward and downward, and the trailing edge changes the size of the droplet to control the trajectory of the droplet and increase the supply of liquid in the horizontal direction. A spray nozzle attached to a pressurized liquid source, wherein substantially the same amount of liquid can be sprayed per unit length. 3. The spray nozzle according to claim 2, wherein said tapered portion of said diffusion portion extends downward from said abdominal plate portion to an intermediate portion of said wall portion. 4. The spray nozzle according to claim 3, wherein the lower corner of each of the terminal discharge portions of the diffusion portion and the wall portion is curved in an arc shape. 5. A lower edge of said wall portion extends below a bottom portion of said outlet tube, an upper portion of said wall portion contacts each of opposite ends of said outlet tube, and an inner surface of said abdominal plate portion is provided with said outlet tube. 5. The spray nozzle according to claim 4, wherein the extension of the extension is defined, thereby forming an inverted U-shaped slot-shaped discharge opening, the upper part of which is an extension of the outlet pipe. 6. A manifold ring is mounted on the main body, and the main body has a plurality of radially extending small outlet pipes that pass through the inside of the manifold ring and the outlet pipe, and the manifold ring includes all of the manifold rings. It is sealed at a distance from the outside of the main body so as to communicate with the small outlet pipe, and an additive supply means is connected to the manifold ring, so that when the liquid passes through the outlet pipe, the additive can The spray nozzle according to claim 1, wherein the spray nozzle discharges the air to the outlet pipe via a space between a manifold ring and the main body. 7. A sprue nozzle for spraying a pressurized liquid, comprising: a main body containing said outlet pipe communicating with a pressurized liquid source;
A discharge extension of the main body formed by a pair of walls parallel to each other with a space substantially equal to the diameter of the outlet pipe, wherein the wall is connected to the upper edge by the abdominal plate portion A lower edge that forms a slot-like structure and is open, a diffusion portion is provided at a position away from the outlet pipe and between ends of the wall portion, and the manifold ring is attached to the main body; Has a plurality of small outlet pipes radially provided so as to pass through the inside of the manifold ring and the outlet pipe, and the manifold ring is sealed at a distance from the outside of the main body to communicate with all the small outlet pipes. , The additive supply means is connected to the manifold ring, so that when the liquid passes through the outlet pipe, the additive between the manifold ring and the main body The manifold ring is discharged to the outlet pipe via a space, and further, the manifold ring includes a joint connected to a supply tube and a pair of O-ring seals located between the manifold ring and the main body, and rotates the manifold ring. And a sprue nozzle mounted on a pressurized liquid source adapted to remove and replace or repair the manifold ring. 8. The body has a large cavity forming the inlet of the outlet pipe, which increases the flow velocity of the pressurized liquid as it passes through the inner end of the radially provided small outlet pipe. Lowering the static pressure to promote the injection of the additive around the liquid flow passing through the outlet pipe to mix the additive well with the material passing through the outlet pipe, and further mix the additive and the material better by the diffusion unit. The spray nozzle according to item 7, wherein 9. The diffuser is a flat plate attached and fixed from the abdominal plate portion of the extension, and extends downward at equal intervals to the inner surfaces of the wall which are separated from each other. An arcuately curved leading edge facing the outlet pipe, which pools the running water in front of the diffuser and turns the flowing water into splashes by the diffuser, and a trailing edge that tapers in the direction of the trailing edge and upwards. 9. The spray nozzle according to claim 8, further comprising: changing the size of the droplet by the trailing edge to control the trajectory of the droplet to perform uniform spraying in the lateral direction. 10. A lower corner of each of the end discharge portions of the diffusion portion and the wall portion is curved in an arc shape, and a lower edge of the wall portion extends below a bottom portion of the outlet pipe, and a lower portion of the wall portion is formed. An upper portion abutting each of the opposed edges of the outlet tube, an inner surface of the abdominal plate portion defining an extension of the outlet tube,
10. The spray nozzle according to claim 9, wherein these form an inverted U-shaped slot-shaped discharge opening whose upper portion is an extension of said outlet pipe. 11. A curved leading edge of said diffuser directs liquid impinging on said diffuser downwardly and discharges a portion thereof towards the distal end of a nozzle connected to a supplied pressurized liquid source; The flat plate guides the liquid flow so as to bypass both side surfaces thereof, and the two flow passages are blocked by the inner surface of the wall portion that is spaced apart from each other to cause a dividing effect between the two flow passages. 11. The spray nozzle according to claim 10, wherein a discharge pattern is formed such that substantially the same amount of liquid per unit length lands along the discharge pattern. 12. The curved leading edge of said diffuser directs impinging liquid downwardly and discharges a portion thereof in the direction of the distal end of a nozzle connected to a source of pressurized liquid, and wherein said flat plate is a liquid flow. Are guided so as to bypass both side surfaces thereof, and these two flow paths are blocked by the inner surface of the wall portion which is spaced apart from each other, so that a dividing effect between the two flow paths is generated, and a unit is formed along the discharge pattern. 2. A spray nozzle according to claim 1, wherein said spray nozzle forms a discharge pattern such that approximately equal amounts of liquid per length land. 13. The means for injecting an additive into the outlet pipe comprises a circumferential manifold means on the main body, and the additive supply means communicates with the manifold means, and is provided by a plurality of small outlet pipes of the main body. The spray nozzle according to claim 1, wherein the manifold means and the outlet pipe communicate with each other, whereby an additive is injected into the outlet pipe and mixed with a liquid flowing through the outlet pipe. 14. The manifold means comprises a cavity extending circumferentially corresponding to a circumferential shape on the main body, a cylindrical manifold ring is sealed with respect to the main body and the cavity, An agent supply means communicating with the cavity;
The small discharge pipe is composed of a plurality of small discharge pipes radially arranged at equal intervals on the main body, and the small discharge pipe communicates the cavity and the discharge pipe, thereby forming a circle on the circumference. 14. The spray nozzle according to claim 13, wherein an approximately equal amount of the additive is discharged to the outlet pipe from a point at which the space is provided. 15. A spray nozzle, comprising a body having an outlet tube and communicating with a source of pressurized liquid, comprising an outlet tube having a constant diameter over its length, reducing the pressure of the pressurized fluid to approximately 0 psi. And means for providing a low pressure additive source and at least one passage in the body for injecting an additive into the approximately 0 psi liquid flowing through the outlet tube, wherein the 0 psi liquid flowing through the outlet tube is provided. Means for mixing and injecting additives. 16. The main body is disposed around the main body,
And a manifold communicating with the additive source, and a plurality of passages communicating the manifold with a constant-diameter outlet pipe for injecting the additive into the liquid flowing through the outlet pipe. A spray nozzle according to the item. 17. The manifold means comprises a circumferential outer cavity in the body, wherein the manifold ring extends circumferentially through the cavity in a sealed relationship with the body and the cavity. The additive supply means communicates with the cavity, and the small outlet pipe extends radially from the cavity to the outlet pipe and is arranged at equal intervals at the same size, whereby the small outlet pipe is arranged on the circumference of the outlet pipe. 17. The spray nozzle according to claim 16, wherein an equal amount of the additive is injected into a portion located at an interval and mixed with the liquid passing through the outlet tube.