JPS60232263A - Flat jet type spray nozzle for particularly atomizing plant protective agent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a flat jet spray nozzle for use at relatively low spray pressures, in particular for spraying plant protection agents, in which the nozzle body and the center line are shifted in the flow direction. , that is, it relates to a fan-shaped jet type spray nozzle (6).

Spray nozzles of this type are used in agriculture, for example for spraying plant protection agents. In the case of these spray nozzles, it is important to distribute the liquid as evenly as possible in the jet of the individual nozzle or in the area to be sprayed of the nozzle unit. On the other hand, since the flow rate is usually relatively low,
The nozzle cross-sectional area is relatively small. In order to meet the requirements along the lines of uniform liquid distribution in the case of small nozzle cross-sections, a high liquid prepressure is required, resulting in a disadvantage that the droplet size is very small. This drawback can lead to the spray liquid being blown away by the wind, for example when spraying plant protection agents. Therefore, none or only part of this liquid reaches the given ground.

Droplet size can theoretically be increased by decreasing the spray angle. However, this is not possible. This is because it is necessary to be able to exchange nozzles of different sizes on the injection rod, so the spacing between the nozzles on the pipe (7) and the height of the nozzles from the ground must remain unchanged.

It is also practically impossible to increase the size of the drops by enlarging the nozzle cross-sectional area. This is because it would increase the flow rate unacceptably.

Due to these circumstances, the only practical solution to enlarging the droplet size is to reduce the preload to a lower level. However, this measure results in a non-uniform liquid distribution over the entire length of the flat jet or the entire length of the nozzle tube in the nozzle in question. This is true even when the maximum pressure is above the 1.5 bar allowed to obtain large drops, and is even more pronounced when the pressure is lower.

In the case of the rice slurry mentioned at the outset, which is known from German Patent No. 455 758, starting from the aforementioned type of problem, thick droplets are sprayed at relatively low spray pressures.
Obtained by a passage of cylindrical cross section. This channel is constricted on the inlet side (8) and opens on the outlet side into a narrow nozzle opening of elliptical cross section, which is arranged symmetrically with respect to the channel axis.

In this case, the reduction on the inlet side is formed by two diametrically opposed projections. The projection is arranged in a line parallel to the long main axis of the nozzle opening and extends over a portion of the length of the passage from the inlet end towards the outlet end of the passage. In this case, the inlet end of the channel has an oval cross section.

This relatively complex solution is prone to blockages and becomes ineffective when the corresponding points of the reduction part wear out. With aggressive and/or abrasive media that are sprayed for plant protection, abrasion occurs relatively quickly. The larger the edge or protrusion, the faster this wear occurs. This drawback is especially true of the above-mentioned solutions described in German Patent No. 455,738. This known solution also has the disadvantage (9) that the nozzle cannot be made of a hard material, so that it cannot be subsequently plastically deformed from a brittle material, such as ceramics. It is also impossible to manufacture the known nozzle described in German Patent Publication No. 455,758 by molding one piece without cutting, for example by injection molding a synthetic resin. This is because it is no longer possible to remove the finished injection molded nozzle in order to enlarge the nozzle interior in connection with the cross-sectional reduction indicated by this German patent.

The object of the invention is to satisfy all the above-mentioned conditions, namely relatively large drops, low prepressure, low flow rate and a nevertheless homogeneous liquid distribution, while also e.g. It is an object of the present invention to provide a nozzle of the type mentioned at the outset, which can be made simply and from a variety of materials, in particular wear- and corrosion-resistant materials.

This problem is solved according to the invention by providing a non-rotationally symmetrical enlargement at the transition between the two inner chamber regions, which enlargement is axially symmetrical with respect to a common longitudinal center plane (for example l-1) of the two inner chamber regions. This is achieved by being formed and arranged (10).

The purpose of distributing the liquid at a spray angle of, for example, 120 degrees in flat jet nozzles of this type is a Gaussian distribution of the liquid within the spray jet. Low pressure produces a small injection angle,
and the liquid is distributed less in the central part and more in the edge regions. of the cross-sectional transition part of the cylindrical nozzle inner chamber,
Advantageously, the widening according to the invention slows down the flow in some areas. Therefore, the turbulent flow caused by the acceleration of the contraction section is circulated. A laminar flow resulting in large droplets is obtained.

Another important advantage of the invention is that, without significant cost,
The nozzle can be produced by cutting-free molding, for example as an injection-molded plastic part or from ceramics or hard metals or sintered metals.

Embodiments and other effects of the present invention are described in claims 2 to 3.
+S, Z, will become clear from the figures showing the embodiments and the description of the embodiments below.

The embodiments of the flat jet type spray nozzle shown in the figure, that is, the fan-shaped jet type spray nozzle (11), each have a nozzle body 1.
0. This nozzle body has a cylindrical inner chamber 11 with a step, and a nozzle outlet 12 is connected to one of the inner chambers. The liquid to be sprayed, for example a plant protection agent, flows past the nozzle in the direction of arrow 13.

The nozzle body 10 can be made of various materials, for example metal, plastic or ceramic. Especially the 5th to 1st
The embodiment shown in Figure 0 is fabricated by non-machining of synthetic resin or ceramic. On the other hand, the 11th
The embodiments of Figures 1 to 16 are suitable for machining production.

As can further be seen, the cylindrical interior chamber 11 of the nozzle includes a portion 14 of increased diameter. This section is connected in the flow direction via a shoulder or transition section 15 to the nozzle pressure gap 16 in a stepped manner. This nozzle pressure gap 16 has a small diameter and opens into the nozzle outlet 12.

It is very convenient to form the shoulder 15 in a stepped shape as shown in the figure (12) when cutting the nozzle body 10, but it may be formed in other shapes. For example, without departing from the scope of the invention, the shoulder 15 can be made of a circle 16 consisting of two parts 17, 18 having different diameters. In this case, the large-diameter section 17td is connected in the flow direction 13 via a shoulder or transition 19 to the small-diameter end section 18 in a stepped manner. In this case as well, the same can be said for the formation of the shoulder 19 by cutting, for example, as in the case of the shoulder 15 described above.

In the embodiment of FIGS. 5 and 4, the nozzle outlet diameter is very small (approximately 211111 mm or less). In this case, the two-step constriction of the nozzle interior 11 allows a large error.

However, in all other embodiments, nozzle interior 11
has a one-stage reduction section.

Furthermore, as can be seen, an enlargement 20 is provided on the stepped shoulder 15 between the two inner chamber parts 14,16. In all embodiments, the (13) important feature of this enlargement is that it is rotationally symmetrical. The enlargement 20 is thus arranged with respect to a longitudinal midplane common to both interior parts, which plane is indicated by the center line 21 of the nozzle interior 13, which is perpendicular to the flow direction 13 when viewed from above. They are formed and arranged axially symmetrically. As shown in the figures, the specific transverse axis of the enlarged part 20 in all cases overlaps with the center line 21 of the nozzle interior 11.

Furthermore, the enlarged portion 20 is formed and arranged axially symmetrically in all illustrated embodiments with respect to the second longitudinal central plane (for example, the section 1--2 in FIG. 7).

In the individual embodiments, the formation of the enlarged portion 20 is slightly different. Figures 1-4, Figures 11-13 and Figures 17-19
In the illustrated embodiment, each of the enlarged portions 20 is formed in an arc shape when viewed from above.

In other words, it has the shape of two circular arc parts.

In the embodiment of FIGS. 5 to 7, the enlarged portion, designated 20a, is rectangular when viewed from above (FIG. 7), whereas in the embodiment of FIGS. H,,201) has a triangular cross section (see Figure 10),
The nozzle 16 is attached in a tangential direction to the cylindrical nozzle 16.

In the embodiments shown in FIGS. 11 to 16, the enlarged portion 20 is not provided. Therefore, the enlarged portion is substantially the same as the embodiment of FIGS. 1-4.

The enlarged portion indicated by 20c in FIGS. 14-16 is not attached in the direction.

Although the enlarged portions 20 are formed to have different cross sections as described above, they may also be formed to have different longitudinal sections. For example, Figures 1 to 4, Figures 11 to 16, and
In case (15) of the embodiments of FIGS. 7 to 19, the widening can be designed conically or spherically, decreasing in the flow direction 13.

In the case of the embodiment shown in FIGS. 5 to 7, the longitudinal section of the enlarged portion 20a is stepped and formed in a cylindrical/oblique shape, and the same is true in the case of FIGS. 8 to 10.

In the case of the embodiments shown in FIGS. 11 to 13, the longitudinal section of the enlarged portion 20 is formed in a regular ζ shape so as to form an angle of 45 to 90 degrees, particularly 60 degrees, and contract into a conical shape (see FIG. 12). ). The same applies to the embodiments shown in FIGS. 14 to 16.

In the case of the embodiment shown in FIGS. 17 to 19, the conical reduction portion of the enlarged portion 20a is seen in longitudinal section (see FIG. 18), and the conical reduction portion 22 and 2
It is formed into a stepped shape by two parts indicated by 3.

In this case, the cone angle of the first (upper) part 22 is smaller than the cone angle of the second part 2b that follows it in the flow direction 16.

In all the illustrated embodiments, the nozzle outlet 12 has an elongated/slit-like shape extending transversely to the flow direction 13. If the nozzle in question is made by cutting (16) (e.g. the embodiments of FIGS. 11-16), the nozzle body 12 is cut by a suitable milling cutter.
The nozzle outlet can be easily formed by milling from the bottom side. If the nozzle is manufactured without cutting, for example, from synthetic resin, ceramics, hard metal, sintered material, etc. as an injection molded member, the nozzle outlet 1
2 together with other parts of the nozzle (for example, the inner chamber part 11, the nozzle space 16, the non-rotationally symmetric enlarged part 20, etc.)
It can be manufactured in one work process.

Additionally, common features for most of the illustrated embodiments are:
A non-rotationally symmetric enlarged portion 20 that is elongated in plan view.
are provided parallel to the elongated/slit-shaped nozzle outlet 12 (see FIGS. 5 to 19).

In certain situations, especially in nozzles where the hole diameter B is small and the flow is not always uniform, the ratio of the diameter B between the nozzles 1 and the milling depth T of the nozzle outlet 12 (see FIG. 1) will be different. (17), the nozzle exit slit 12 (designated 12' in FIGS. 2 and 4, respectively) is preferably arranged rotated by 90 degrees with respect to the rotationally asymmetric enlargement 20. The reason is that the viscosity of the water increases when the nozzle diameter is small (in this case, the Reynolds number becomes small).

Therefore, if the nozzle diameter B is small, the flow must be directed in another direction. For this purpose, as already mentioned, the nozzle outlet slit 12' is rotated to a position offset by 90 degrees with respect to the rotationally asymmetric enlarged part 20 or its central axis 21.

In the claims of the present application and the rest of the specification, the concept of "nozzle body" 10 is in no way limited to nozzle bodies 10 that are formed in one piece in the same way in all embodiments. On the other hand, the nozzle body can be formed from multiple parts. In this case, for example, an inner chamber part 16 with a small cross-sectional area is provided in the first nozzle body part and an inner chamber part 14 with a large cross-sectional area is provided in the second nozzle body part. Furthermore, considering the effect (18) of the present invention, the liquid supply pipe connected to the nozzle can be included in the concept of "nozzle body". because,
This is because an interior region 14 with a large cross-sectional area can be provided in such a liquid supply pipe directly in front of its own nozzle body.

When producing the nozzle body, for example by cutting metal, it is very advantageous in terms of manufacturing technology to form an enlargement in each cross-sectional transition 15 by plastic deformation, for example compression molding.

[Brief explanation of the drawing]

FIG. 1 is a vertical longitudinal sectional view (a sectional view taken along the line I-I in FIG. 2) of an embodiment of a flat jet type spray nozzle having a single-stage nozzle interior, and FIG. FIG. 3 is a plan view of the nozzle, and FIG. The figure is a plan view of the nozzle in Figure 3, Figure 5 is a vertical cross-sectional view (19) of another nozzle taken along line ■-■ in Figure 7, and Figure 6 is a vertical cross-sectional view taken along line Vl-IV in Figure 7. 7 is a plan view of the nozzle in FIGS. 5 and 6, FIG. 8 is a diagram showing another nozzle (a sectional view taken along the line Cross-sectional view along the line ■-■ in Figure 10, 1st
Figure 0 is the plan view of Figures 8 and 9, Figure 11 is the XI of Figure 13.
12 is a sectional view of another embodiment of the nozzle along line XI, FIG. 12 is a sectional view of FIG. 14 is a longitudinal cross-sectional view of another embodiment of the nozzle along the line xy-xy in FIG. 16, FIG. 15 is a cross-sectional view along the line xv-xv in FIG. 16, and FIG. is a plan view of the nozzle according to Figs. 14 and 15, Fig. 17 is a longitudinal sectional view of another nozzle taken along the line FIG. 19 is a plan view of the nozzle of FIGS. 17 and 18. 10... Nozzle body 11... Inner chamber 14. 16... Inner chamber area C20) 15... Transition section 20... Expansion section agent Mitsuyoshi Ezaki agent Mitsufumi Ezaki C21) Page 1 Continue ■ Inventor Helmut Wentz Doel

Claims (1)

[Claims] 1. In a flat jet type spray nozzle used at a relatively low spray pressure for spraying a plant protection agent into a cylindrical inner chamber whose center line extends in the flow direction, both inner chambers include: At the transition (15) of the region (+4.L6), a non-rotationally symmetrical enlargement (20) is provided, which enlargement lies in the common longitudinal central plane of both interior chamber regions (+4.+6) (e.g. l-
A flat jet spray nozzle characterized in that it is formed and arranged axially symmetrically with respect to (1). 2. Claims (1) characterized in that the enlarged portion (20) is formed and arranged axially symmetrically with respect to two mutually perpendicular vertical central planes (e.g. v-v, -vx) 2. The flat jet spray nozzle according to item 1. (v) An elongated/slit-shaped nozzle outlet extending transversely to the flow direction, and an enlarged part (20) having an elongated shape when viewed from above is connected to the elongated/slit-shaped nozzle outlet (12).
3. The flat jet type spray nozzle according to claim 1 or 2, wherein the flat jet type spray nozzle is arranged in parallel to the jet nozzle such that the flow direction coincides with the nozzle outlet. 4. An enlarged part (20) having an elongated/slit-like nozzle outlet extending transversely to the flow direction and having an elongated shape when viewed from above is connected to the elongated/slit-like nozzle outlet (1).
2') and such that the flow direction coincides with the nozzle outlet. (2) the rotationally non-rotationally symmetrical widening (20) has a maximum cross section; The flat jet type spray nozzle described in . & The non-rotationally symmetric enlarged portion (20a) is the nozzle chamber C11.
) or a cross section that is not attached tangentially to the nozzle tip (, 6), according to any one of claims 1 to 5. The flat jet according to any one of claims 1 to 5, characterized in that it has a triangular cross section tangentially attached to the mold jet amount (16). type spray nozzle. (6) A flat jet type spray nozzle according to claim 6 or Fi 7. 9. Claims characterized in that the rotationally non-rotationally symmetrical enlargement (2o) has an arc-shaped cross section that is not attached tangentially to the interior chamber (11) or to the nozzle V space (16) The flat jet spray nozzle according to any one of Items 1 to 5. IQ, a non-rotationally symmetric enlargement (20c) is located inside the inner chamber (11
) or the nozzle '4fa'j (+6), which has a triangular cross section that is not attached in the tangential direction. The flat jet type spray nozzle described in . 11. The non-rotationally symmetrical enlarged portion (20c) is formed in a longitudinal section so as to contract conically in the flow direction (13), and has a cone angle of 45 to 90 degrees, particularly about 60 degrees. A flat jet spray nozzle according to claim 9 or 10. (4) 12. The non-rotationally symmetric enlarged part (20d) is formed to conically contract in two consecutive parts (22, 23), and the cone angle of the first part (22) is direction(
The second part (2) connected to this first part at 16)
3) The flat jet type spray nozzle according to any one of claims 9 to 11, characterized in that the cone angle is smaller than the cone angle of claim 3). 11. The flat jet spray nozzle according to any one of claims 1 to 12, which is formed as a synthetic resin injection molded part or a synthetic resin cast molded part. 14. The flat jet type spray nozzle according to any one of claims 1 to 12, characterized in that the spray nozzle is made of a ceramic material. 15. The M described in any one of claims 1 to 12, characterized in that it is made of a hard metal.
Flat jet spray nozzle. 16. Patent (5) The flat jet type spray nozzle according to any one of claims 1 to 12, characterized in that the spray nozzle is made of a sintered material. 17. It has a nozzle body made of one or more members, the nozzle body (10) is made by cutting, and the non-rotationally symmetric enlarged part (20) is formed by plastic deformation, especially by pressing. A flat jet type spray nozzle according to any one of claims 1 to 12, characterized in that: 1a. The flat surface according to claim 1, characterized in that the transition part (15) between the two inner chamber areas (14, 16) is formed in a step-like manner. Jet type spray nozzle.