JP2022135867A - spray nozzle - Google Patents

Abstract

To improve reachability of a mist particle caused by atomization of collided liquid in a spray nozzle of a type for causing collision of liquid jetted from a pair of jetting ports so as to be sprayed.SOLUTION: By forming a pair of jetting ports 15 of a nozzle main body 1 with a long hole extending in parallel to each other in a direction orthogonal to a direction connecting the jetting ports 15, liquid supplied from a rear face side of the nozzle main body 1 and ejected from the jetting port 15 through a liquid passage 14 becomes a flat jet which spreads in the same direction as the jet port 15, and collides with and atomizes at a predetermined position more surely than a jet ejected from a conventional circular spout. Mist particles having small particle size are attracted to large particle size mist particles generated on both sides of a fan-shaped spray pattern formed by the liquid after collision, so that the mist particles reach a place far from a conventional one as a whole.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a spray nozzle used for spraying liquids such as agricultural chemicals and water.

Conventionally, a spray nozzle for spraying a liquid such as an agricultural chemical has a cylindrical nozzle body that is open at the rear side and has a jet outlet at the center of the closed front side, and a nozzle body that is housed inside the nozzle body and a core having a plurality of slanted grooves, the liquid supplied from the rear side of the nozzle body passes through the slanted grooves of the core, swirls in the space between the core and the front surface of the nozzle body, and spouts out. There is one that is ejected from the nozzle to form a hollow cone-shaped spray pattern (generally called a swirling type).

However, the swirl-type spray nozzle as described above atomizes the liquid by spouting it while swirling, and the mist droplets become finer and diffuse over a relatively wide angle, so that they do not adhere to the target such as crops. It works well, but it's not very suitable for making mist droplets reach a distant place. On the other hand, if the particle size of the mist droplets is increased by changing the size of the ejection port or the like, the reachability of the mist droplets is improved, but the adhesion is reduced.

On the other hand, as a spray nozzle suitable for applications where the reachability of mist droplets to a distant place is important, such as spraying pesticides or water on tall crops, a pair of ejection holes are provided on the front of the nozzle body. A structure has been proposed in which the center lines of the nozzle bodies intersect in front of the nozzle body (see, for example, Patent Document 1).

In the spray nozzle proposed in Patent Document 1, the liquid supplied from the rear side of the nozzle body and ejected from each ejection port through the liquid passage collides with each other at a predetermined position in front of the nozzle body and atomizes. , By forming a spray pattern that is thin in the direction connecting both nozzles and spreads in a fan shape along a plane perpendicular to that direction, coarse mist droplets are sprayed in a narrow range and far away compared to a swirling spray nozzle. The place is supposed to be reached.

Japanese Patent No. 3890121

However, in the above-described spray nozzle that sprays the liquid ejected from a pair of ejection ports by colliding with each other, the liquid ejected from the circular ejection port has a diameter slightly smaller than the diameter of the ejection port. Therefore, depending on the conditions of use, the two jet streams cannot collide at a predetermined position, and there is a risk that the spray pattern will be disturbed and the reachability of the mist droplets will be reduced.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve reachability of mist droplets generated by atomization of the colliding liquid in a spray nozzle of a type in which liquids ejected from a pair of ejection ports are caused to collide to be sprayed.

In order to solve the above-mentioned problems, the present invention includes a nozzle body having a liquid passage through which liquid supplied from the rear side passes, and a pair of ejection ports communicating with the liquid passage and opening on the front side, The pair of ejection openings of the nozzle body is provided so that the respective center lines intersect in front of the nozzle body. In a spray nozzle in which the ejected liquid collides with each other in front of the nozzle body and is atomized to form a flat fan-shaped spray pattern, the pair of ejection ports are arranged in a direction connecting the two ejection ports. A configuration of elongated holes extending parallel to each other in a direction orthogonal to the .

According to the above configuration, the liquid ejected from the pair of ejection openings that open on the front side of the nozzle body becomes a flat jet that spreads in the same direction as the ejection openings, and is more flat than when the ejection openings are circular as in the prior art. The droplets collide at a predetermined position and atomize, forming a spray pattern that is thin in the direction in which each jet extends and spreads in a fan shape along a plane perpendicular to that direction, and on both sides of the fan shape of the spray pattern. Since the particle size of the fog particles forming the part becomes large, and the fog particles with a small particle size are attracted to the fog particles with a large particle size, the reachability of the fog particles can be improved.

Here, it is preferable that the pair of ejection ports of the nozzle body be provided so that the angle (intersecting angle) formed by the respective center lines is 60 to 80 degrees. This is because when the angle of intersection between the center lines of the two nozzles is smaller than 60 degrees, the central angle (spray angle) of the fan-shaped spray pattern becomes small and the reachability of the mist droplets increases, but the force becomes too strong. On the other hand, if the crossing angle is larger than 80 degrees, the spray angle becomes too large and the reachability of the mist droplets may not reach the desired level. is.

Further, if the liquid passage of the nozzle body is provided separately for each of the ejection ports, the flow of liquid from the rear surface side of the nozzle body to each ejection port is stabilized, and the liquid from each ejection port is stabilized. Since the ejected liquid becomes a highly straight jet and collides with each other, the reachability of the mist particles can be further improved.

Furthermore, by providing the pair of ejection openings of the nozzle body on both sides or one side in the longitudinal direction of both ejection openings so that the positions of the ends corresponding to each other are shifted in the longitudinal direction, the reachability of the mist particles is further improved. can be made That is, if a pair of ejection ports are provided in a longitudinal direction, the liquid ejected from one ejection port collides with the liquid ejected from the other ejection port on at least one side of the sector of the spray pattern. However, since there is a region in which the fog droplets are larger in diameter than the fog droplets inside the fan and move straight at a high speed, the fine fog droplets inside the fan drawn by the fog droplets moving straight are also farther away. You will reach the place.

In the spray nozzle of the present invention, as described above, the pair of ejection openings that open on the front side of the nozzle body are elongated so that the liquids ejected from the ejection openings collide with each other. Therefore, as compared with the conventional nozzle having a circular nozzle, the reachability of the mist droplets can be improved. In addition, fine mist droplets can be made to reach a distant place, so adhesion to the target is ensured. Therefore, if this spray nozzle is used in applications where the reachability of mist droplets is important, such as spraying pesticides on tall crops, the spraying operation can be carried out efficiently.

1 is an exploded perspective view of a spray nozzle according to an embodiment; FIG. 2 is an assembled perspective view of the nozzle body of FIG. 1; FIG. Vertical cross-sectional front view of the spray nozzle of FIG. FIG. 3 is a vertical cross-sectional front view showing an enlarged main part of the nozzle main body of FIG. 2 ; (a) and (b) are respectively explanatory diagrams of spray patterns by the spray nozzle of FIG. FIG. 2 is a plan view of a modification of the nozzle body of FIG. 1; (a) and (b) are explanatory diagrams of the behavior of the liquid ejected from the nozzle body of FIG. 6 before and after the collision. Explanatory drawing of the spray state immediately after liquid collision when using the nozzle body of FIG. 6 (view from the front side) (a) and (b) are explanatory diagrams of the spray pattern when using the nozzle body of FIG. 6, respectively.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 9. FIG. As shown in FIGS. 1 to 3, this spray nozzle comprises a nozzle body 1 consisting of two nozzle pieces 1a and 1b, a nozzle receiver 2 for supporting the nozzle body 1 so as to pass through it, and an opening on the rear side of the nozzle body 1. a nozzle guide 3 closing the nozzle guide 3, a cylindrical packing 4 disposed so as to be in close contact with the nozzle receiver 2 and the rear end surface of the nozzle guide 3, a filter 5 disposed inside the packing 4, and the latter half of the nozzle receiver 2 and a holder 6 comprising a holding portion 6a externally fitted to the packing 4 and a connecting portion 6b connected to an external liquid supply source, and the holder 6 is held in a state externally fitted to the front half portion of the nozzle receiver 2. It has a cap 7 screwed to the portion 6a. In these drawings and FIG. 4, the upper side is the front of the spray nozzle (the direction in which the liquid is ejected).

The nozzle main body 1 is made of resin, and the outer shape of the main body portion 11 is formed to have a substantially oval cross section from the front end to the vicinity of the rear end, and a flange 12 is provided on the cylindrical portion at the rear end. Also, on the front side of the body portion 11, a V-shaped groove is formed which is composed of a pair of inclined surfaces 13 orthogonal to the width across flats portion of the side surface, and inside the body portion 11, each groove is formed separately from the opening on the rear side. A pair of liquid passages 14 are provided to reach the back surface of the inclined surface 13 . A pair of ejection ports 15 are provided in the V-shaped groove of the main body 11 so as to communicate with the liquid passage 14 and open to the inclined surface 13 .

Here, as shown in FIG. 4, the pair of inclined surfaces 13 on the front side of the nozzle body 1 are formed so as to form an angle of 110 degrees with each other. The center lines C of the pair of ejection ports 15 intersect at a predetermined position in front of the nozzle body 1 . That is, the pair of ejection ports 15 are provided so that the intersection angle θ between the respective center lines C is 70 degrees. , collide with each other in front of the nozzle body 1 at an intersection angle of 70 degrees.

As shown in FIGS. 1 and 2, each ejection port 15 is an elongated hole extending parallel to each other in a direction orthogonal to the direction connecting the two. symmetrical. The specific shape of the elongated hole is an oval with semicircular rims at both ends in the longitudinal direction and parallel rims on both sides of the central portion.

The nozzle body 1 is divided into two nozzle pieces 1a and 1b each having one liquid passage 14 and one inclined surface 13 (and one ejection port 15). Engagement claws 16 extending from the width portion toward the other nozzle piece 1b are integrated by engaging with engagement recesses 17 formed in the width across flats portion on both sides of the other nozzle piece 1b. It's becoming The engaging claw 16 and the engaging concave portion 17 can be easily engaged by snap fitting. As the resin forming the nozzle main body 1, a resin having excellent abrasion resistance such as PPS (polyphenylene sulfide) or POM (polyacetal) is preferable.

Further, as shown in FIGS. 1 and 3, the nozzle receiver 2 is a cylindrical member having stepped surfaces facing rearward on the inner and outer circumferences thereof. Then, in a state in which the stepped surface on the inner periphery is in contact with the front surface of the flange 12 of the nozzle body 1, a plurality of projections 21 projecting from the stepped surface on the outer periphery are fitted onto the main body portion 11 of the nozzle body 1, which will be described later. It is positioned and fixed with respect to the holder 6 as shown in FIG.

The nozzle guide 3 is provided with a flange 32 at the rear end portion of a cylindrical portion 31 which is open on the rear side and closed on the front side. A pair of small-diameter cylindrical portions 33 protrude from the front surface of the cylindrical portion 31, and holes passing through the small-diameter cylindrical portions 33 communicate with openings on the rear surface side. The flange 32 is fitted to the inner circumference of the rear end portion of the nozzle receiver 2 in a state in which each small-diameter cylindrical portion 33 is inserted into the liquid passage 14 of the nozzle body 1, and the liquid supplied from the rear surface side flows into the nozzle body. Each liquid passage 14 of 1 is evenly delivered. Between the outer peripheral surface of each small-diameter cylindrical portion 33 and the inner peripheral surface of the rear end portion of the nozzle body 1, and between the outer peripheral surface of the cylindrical portion 31 and the inner peripheral surface of the nozzle receiver 2, O-rings are provided. 8 and 9 are included.

The packing 4 is fitted to the inner periphery of the holding portion 6a of the holder 6 with its front end face abutting against the nozzle receiver 2 and the rear end face of the nozzle guide 3. As shown in FIG.

The filter 5 includes a mesh portion 51 formed in a hemispherical shape and a mounting portion 52 projecting radially outward from the periphery of the mesh portion 51 . The packing 4 and the holder 6 are fixed by the connecting portion 6b in the fitted state.

The holder 6 accommodates the packing 4, the filter 5, the nozzle receiver 2, and the rear end portion of the nozzle guide 3 inside the holding portion 6a. is positioned and fixed to the nozzle receiver 2 by fitting with the projection 21 of the nozzle receiver 2, and is threadedly connected to the inner peripheral female thread of the cap 7 with the external thread provided on the outer periphery of the holding portion 6a. Then, the internal thread provided on the inner circumference of the rear end side of the hole penetrating the connecting portion 6b is screwed to the external thread provided on the tip portion of a pipe or the like (not shown) on the liquid supply source side, and the inner side of the packing 4 is connected. It is designed to deliver liquid to the

The cap 7 is a cylindrical member through which the body portion 11 of the nozzle body 1 is passed through the opening on the front side. Then, in a state in which the stepped surface provided on the inner periphery is in contact with the front end face of the nozzle receiver 2, the internal thread provided on the inner periphery on the rear end side is threadedly coupled to the external thread of the holding portion 6a of the holder 6. Thus, the nozzle main body 1 is fixed through the nozzle receptacle 2 to prevent it from coming off.

This spray nozzle has the above structure, and the liquid supplied from the liquid supply source is sent from the connecting portion 6b of the holder 6 to the inside of the packing 4, passes through the filter 5, and passes through the nozzle guide 3 to the nozzle. The fluid is fed into a pair of liquid passages 14 of the main body 1 and ejected from an ejection port 15. - 特許庁Then, as shown in FIGS. 5A and 5B, the liquids ejected from each ejection port 15 collide with each other in front of the nozzle body 1 to be atomized. It forms a spray pattern that fans out along a plane perpendicular to that direction.

Here, since the pair of ejection ports 15 of the nozzle body 1 are elongated holes extending parallel to each other in a direction perpendicular to the direction connecting the two ejection ports 15, the liquid ejected from each ejection port 15 becomes a flat jet that spreads in the same direction as The flat jets collide with each other at a predetermined position more reliably than conventional jets with a circular cross section ejected from a circular ejection port. In addition, the spray pattern of the liquid after collision is different from the case where the nozzle is circular, and the direction in which the fan shape spreads is different. Mist particles with a small particle size are attracted to the particles. As a result, this spray nozzle allows the mist particles to reach farther places as a whole than conventional spray nozzles, that is, the spray nozzle has excellent reachability of the mist particles. Moreover, since even small-diameter mist particles reach a distant place, adhesion to the object is ensured.

In addition, since the liquid passage 14 of the nozzle body 1 is separately provided for each ejection port 15, the liquid flow from the rear surface side of the nozzle body 1 to each ejection port 15 is stabilized, and each ejection port The liquid ejected from 15 collides with each other as highly straight jets, which is also one of the factors that improve the reachability of the mist droplets.

By setting the crossing angle θ between the center lines C of the pair of ejection ports 15 of the nozzle body 1 to 70 degrees, the reachability of the mist droplets is sufficiently ensured, and the mist droplets are sprayed onto the crops and the like with appropriate momentum. It can be sprayed on objects. Although the intersection angle θ is most preferably 70 degrees, if it is in the range of 60 to 80 degrees, substantially the same effects as in the case of 70 degrees can be obtained.

Furthermore, in this spray nozzle, the nozzle body 1, which has a somewhat complicated shape as a whole, is divided into two nozzle pieces 1a and 1b, which can be integrated by snap fitting, so that the nozzle body is integrally molded. It also has the advantage of being easier to manufacture.

FIG. 6 shows an example in which the arrangement of the ejection port 15 of the nozzle body 1 is changed. In this modification, a pair of ejection ports 15 are provided on both longitudinal sides of both ejection ports 15 such that the positions of the ends corresponding to each other are shifted in the longitudinal direction. When the arrangement of both ejection ports 15 is shifted in the longitudinal direction in this way, most of the liquid A ejected from both ejection ports 15 is removed from the nozzle body 1 as shown in FIGS. collide with each other at a predetermined position in front of the , and become mist particles B with a small particle size and spread in a fan shape. to go straight without colliding. Then, the liquid A, which advances straight without colliding, becomes fog droplets having a larger particle diameter and a higher speed than the fog droplets inside the fan shape, and advances straight while spreading slightly. As a result, as shown in FIGS. 9(a) and 9(b), mist particles with large particle diameters form both sides of the fan shape, and the fine mist particles attracted by the coarse mist particles are shown in FIG. Since the fog reaches a farther place than the example shown in FIG. 5, the reachability of the mist droplets can be further improved.

In the examples shown in FIGS. 6 to 9, the ejection ports 15 are arranged such that the positions of both ends corresponding to each other are shifted in the longitudinal direction. It is also possible for the positions of the corresponding ends to be offset longitudinally.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the meaning described above, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

For example, the shape of the ejection port of the nozzle body is not limited to an oval shape as in the embodiment, but may be an elongated hole such as an ellipse or a rectangle. Further, the crossing angle between the center lines of the respective ejection ports can be appropriately set according to the application even outside the range shown in the embodiment.

Furthermore, from the viewpoint of ease of manufacture, the nozzle body is preferably made of resin and divided into two parts as in the embodiment, but it is also possible to adopt an integrally molded nozzle body or a metal one. can.

1 nozzle body 1a, 1b nozzle piece 2 nozzle receiver 3 nozzle guide 4 packing 5 filter 6 holder 6a holding portion 6b connecting portion 7 cap 13 inclined surface 14 liquid passage 15 spout 16 engaging claw 17 engaging recess

Claims (4)

A nozzle body having a liquid passage through which liquid supplied from the rear side passes, and a pair of ejection openings that communicate with the liquid passage and open to the front side, the pair of ejection openings of the nozzle body being aligned with each center line. provided so that they intersect in front of the nozzle body,
The liquid supplied from the rear surface side of the nozzle body, passes through the liquid passage, and is ejected from the pair of ejection ports collides with each other in front of the nozzle body and atomizes to form a flat fan-shaped spray pattern. In a spray nozzle that is
A spray nozzle, wherein the pair of ejection ports are long holes extending parallel to each other in a direction orthogonal to a direction connecting the two ejection ports. 2. The spray nozzle according to claim 1, wherein the pair of ejection openings of the nozzle body are provided so that the angle formed by the respective center lines is 60 to 80 degrees. 3. The spray nozzle according to claim 1, wherein one liquid passage of said nozzle body is separately provided for each of said ejection ports. 4. The method according to any one of claims 1 to 3, wherein the pair of ejection openings of the nozzle body are provided on both sides or one side in the longitudinal direction of both ejection openings so that the positions of the ends corresponding to each other are shifted in the longitudinal direction. A spray nozzle according to any one of the above.

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