Flat jet nozzle

Abstract

The invention relates to a flat jet nozzle comprising a nozzle housing, wherein the nozzle housing has an outlet chamber, wherein the outlet chamber has an inlet opening formed by a diaphragm and an outlet opening, wherein a pot-shaped insert is provided downstream of the inlet opening, with the cover thereof being formed by the diaphragm and with a through-opening being arranged in the base thereof, wherein the inlet opening and the through-opening have a common central axis, and wherein the outlet opening is arranged downstream of the based of the pot-shaped insert, wherein a cross-sectional area of the through-opening in the base of the pot-shaped insert is between two and nine times bigger than a cross-sectional area of the inlet opening in the diaphragm.

Description

[0001] Flat jet nozzle

[0002] The invention relates to a flat jet nozzle with a nozzle housing, wherein the nozzle housing has an outlet chamber, wherein the outlet chamber has an inlet opening formed by means of a diaphragm and an outlet opening, wherein downstream of the inlet opening a pot-like insert is provided, the cover of which is formed by means of the diaphragm and in the bottom of which a through-opening is arranged, wherein the inlet opening and the through-opening have a common central axis and wherein the outlet opening is arranged downstream of the bottom of the pot-like insert.

[0003] The invention aims to provide a flat jet nozzle that emits a very coarse droplet spectrum and yet has a uniform liquid quantity distribution across the spray width.

[0004] According to the invention, it is provided that a cross-sectional area of ​​the passage opening in the bottom of the pot-like insert is between twice and nine times larger than a cross-sectional area of ​​the inlet opening in the aperture.

[0005] Surprisingly, with a passage opening that is at least twice as large as the opposite inlet opening in the orifice plate, it is possible to achieve a very coarse droplet spectrum in the emitted flat jet while at the same time achieving a very uniform spray quantity distribution in the emitted spray jet. The passage opening in the base of the cup-shaped insert is located downstream of the inlet opening in the orifice plate. Normally, one would expect the liquid jet formed by the inlet opening to shoot through, i.e. pass essentially unchanged through the passage opening in the base of the cup-shaped insert. Surprisingly, however, this so-called shooting-through effect does not occur with the nozzle according to the invention. Instead, contrary to expectations, a spray jet is generated that has very large droplets and therefore only has minimal drift.The pot-shaped insert can be provided with evenly spaced slots on its peripheral wall, running parallel to the flow direction. Instead of the slots, however, differently designed openings in the peripheral wall of the pot-shaped insert can also be provided within the scope of the invention. By providing slot-like inlet openings that extend into the base of the pot-shaped insert, the pot-shaped insert can be designed without undercuts and can thus be manufactured simply by injection molding. In a further development of the invention, the inlet opening is formed at the downstream end of a channel in the orifice plate, and the cross-section of the channel at the upstream beginning of the channel is larger than at the inlet opening at the downstream end of the channel.

[0006] In other words, the channel in the aperture tapers in the direction of flow.

[0007] In a further development of the invention, the tapered section of the channel is longer than the section of the channel with a constant cross-section.

[0008] In a further development of the invention, a ratio of the length of the tapered section to a length of the section with a constant cross-section is between 4 and 8 and is in particular between 5.5 and 6.

[0009] In a further development of the invention, a ratio of a diameter of the channel at the upstream beginning of the channel to a diameter of the channel at the downstream end of the channel is between 1.5 and 2.5.

[0010] In a further development of the invention, the outlet opening, the inlet opening and the through opening have the common central axis.

[0011] In the flat jet nozzle according to the invention, the outlet opening, which is usually slit-shaped in order to produce an inner flat jet, the through-opening at the bottom of the cup-shaped insert and the inlet opening into the cup-shaped insert in the aperture can thus lie on a common central axis.

[0012] In a further development of the invention, the channel tapers in a truncated cone shape from the upstream beginning or the channel is rounded at the upstream beginning and is tapered in the direction of flow.

[0013] In a further development of the invention, the channel has a constant cross-section following the tapered upstream beginning up to the inlet opening.

[0014] In a further development of the invention, the outlet chamber has a spherical segment-shaped end section in which the outlet opening is arranged, wherein a diameter Dg of the spherical segment-shaped end section and a distance I from the downstream end of the pot-like insert to the point of the spherical segment-shaped end section which is furthest away from the downstream sweeping end of the pot-like insert are coordinated with one another, so that a ratio Dg / I of the diameter Dg to the distance I is between 0.4 and 0.6.

[0015] Such a ratio of diameter Dg to distance I has proven extremely advantageous for the flat jet nozzle according to the invention. Within this diameter ratio range, different performance sizes, i.e., nozzles with different output flow rates at the same operating pressure, can be realized.

[0016] In a further development of the invention, the outlet chamber has a cylindrical inlet section which is arranged downstream of the orifice.

[0017] In a further development of the invention, the outlet chamber has a conically tapered intermediate section.

[0018] In a further development of the invention, the outlet chamber has a spherical segment-shaped end section in which the outlet opening is arranged, wherein upstream of the spherical segment-shaped end section a circular cylindrical section of the outlet chamber is arranged, the diameter of which corresponds to the diameter of the spherical segment-shaped end section.

[0019] In a further development of the invention, the cylindrical inlet section, the conically tapered intermediate section, the circular cylindrical section and the spherical segment-shaped end section adjoin one another in the outlet chamber as seen in the direction of flow.

[0020] The outlet chamber thus tapers in a stepwise manner in the area of ​​the conically tapered intermediate section. This design has proven very advantageous for generating a coarse droplet spectrum with the desired liquid distribution.

[0021] In a further development of the invention, the orifice plate is arranged at the bottom of a cup-shaped spacer, with the cup-shaped insert adjoining the orifice plate downstream. The cup-shaped spacer is formed integrally with the cup-shaped insert. For example, in a nozzle intended to deliver only a small volume flow, the orifice plate can be arranged at the bottom of a cup-shaped insert, thereby shortening the length of the outlet chamber.

[0022] In a further development of the invention, the bottom of the pot-shaped insert with the through-opening is arranged either upstream of a conically tapered intermediate section of the outlet chamber or in the region of the truncated cone-shaped intermediate section of the outlet chamber

[0023] For nozzles designed to deliver only a small flow rate, the base of the cup-shaped insert with the through-opening is positioned near the truncated cone-shaped intermediate section of the outlet chamber. This allows the length of the outlet chamber to be shortened. By simultaneously reducing the diameters of the outlet opening, the inlet opening, and the diameter of the conical end section of the outlet chamber, a coarse-droplet spray jet can be delivered even at a small flow rate. If a nozzle with a larger flow rate is to be realized, the base of the cup-shaped insert with the through-opening is positioned upstream of the conically tapered intermediate section of the outlet chamber.The section of the outlet chamber downstream of the through-opening is therefore longer and, together with a larger diameter of the conical end section of the outlet chamber, a spray jet of large drops with the desired liquid distribution can be emitted even at a high volume flow.

[0024] Further features and advantages of the invention will become apparent from the claims and the following description of preferred embodiments of the invention in conjunction with the drawings. Individual features of the various illustrated and described embodiments can be combined with one another in any way without exceeding the scope of the invention. This also applies to the combination of individual features without other individual features with which they are illustrated and / or described in connection.

[0025] The drawings show:

[0026] Fig. 1 is a side view of a nozzle according to the invention according to a first

[0027] Embodiment, Fig. 2 is a further side view of the nozzle of Fig. 1, wherein the nozzle of Fig. 2 is rotated by 90° compared to the side view of Fig. 1,

[0028] Fig. 3 is a view of the nozzle of Fig. 1 from below,

[0029] Fig. 4 is a view of the section plane AA from Fig. 2,

[0030] Fig. 5 is a side view of a nozzle according to the invention according to a second

[0031] embodiment,

[0032] Fig. 6 is a further side view of the nozzle of Fig. 5, wherein the nozzle of Fig. 6 is rotated by 90° compared to the side view of Fig. 5,

[0033] Fig. 7 is a view of the nozzle of Fig. 5 from below,

[0034] Fig. 8 is a view of the section plane BB from Fig. 6,

[0035] Fig. 9 is a side view of a nozzle according to the invention according to a third

[0036] embodiment,

[0037] Fig. 10 is a further side view of the nozzle of Fig. 9, wherein the nozzle is rotated by 90° compared to the side view of Fig. 9,

[0038] Fig. 11 is a view of the nozzle of Fig. 9 from below,

[0039] Fig. 12 a view of the section plane CC from Fig. 10,

[0040] Fig. 13 is a schematic sectional view of the aperture 38,

[0041] Fig. 14 is a side view of a nozzle according to the invention according to a fourth

[0042] embodiment,

[0043] Fig. 15 is a sectional view of the section plane AA in Fig. 14,

[0044] Fig. 16 is a side view of the nozzle aperture of Fig. 14 and Fig. 15, and

[0045] Fig. 17 is a sectional view taken along section plane BB in Fig. 16. Figs. 1 to 4 show a flat jet nozzle 10 according to the invention in a first embodiment, which is provided for emitting a first volume flow or a first volume flow that lies within a first volume flow range. Figs. 5 to 8 show a flat jet nozzle 30 according to the invention in a second embodiment, which is provided for emitting a second volume flow or a volume flow that lies within a second volume flow range. Figs. 9 to 12 show a flat jet nozzle 50 according to the invention in a third embodiment, which is provided for emitting a third volume flow or a volume flow that lies within a third volume flow range. The third volume flow or the third volume flow range is greater than the first and the second volume flow or volume flow range. The second volume flow orVolume flow range is larger than the first volume flow or volume flow range. The first volume flow range, the second volume flow range and the third volume flow range can overlap in sections. Such an overlap is the case, for example, with the smallest, medium and largest nozzle in a series. Depending on the application, intermediate sizes are also possible. The volume flow ranges of such intermediate sizes do not then have to overlap. Nozzle 10 is therefore intended for dispensing small volume flows, nozzle 30 is intended for dispensing medium volume flows and nozzle 50 is intended for dispensing large volume flows. Nozzles 10, 30, 50 are each designed as flat jet nozzles and are suitable for different applications. In particular, flat jet nozzles 10, 30, 50 are intended for use with pulse width modulated valves. With pulse width modulation, a liquid supply to nozzles 10, 30, 50 is switched on and off.The length or width of a switching pulse determines the amount of fluid that is directed to nozzles 10, 30, 50 per pulse and then dispensed from the nozzles. However, the nozzles 10, 30, 50 according to the invention are also suitable for a constant and non-modulated application of fluid.

[0046] The nozzles 10, 30, 50 according to the invention can be used for a wide variety of applications in agricultural technology, for example for spraying crop protection agents in coarse droplets. The nozzles 10, 30, 50 can be arranged on a spray boom of a field sprayer or the like. Numerous nozzles 10, 30, 50 are arranged next to one another and aligned such that the flat jets of the individual nozzles do not overlap, but the spray jets of the individual nozzles do overlap when viewed in the direction of travel. This makes it possible to achieve extremely uniform liquid distribution across the entire width of a spray boom with numerous nozzles according to the invention. Fig. 1 shows a side view of the flat jet nozzle 10 according to the invention according to a first embodiment of the invention.The flat jet nozzle 10 has a nozzle housing 12, which is provided with a bayonet fastening design in a connection area 14, through which the liquid to be sprayed is also supplied. The housing 12 is placed with the connection area 14 onto a connection flange and then rotated by hand, for example, by 90°. To do this, an operator grasps the lateral actuating wings 16 on the housing 12. This 90° rotation is then sufficient to engage projections (not shown) on the connection flange in recesses 18 in the connection area 14. The flat jet nozzle 10 can thus be attached to and detached from a connection flange of a spray device very easily and without tools.

[0047] The housing has a length 11. At the lower end in Fig. 1, which marks the downstream end of the flat jet nozzle 10, an outlet opening 20 can be seen. The outlet opening 20 is slit-shaped and is created by introducing a wedge-shaped slit into a spherical segment-shaped end section of an outlet chamber, see Fig. 4, which will be explained below. The slit-shaped outlet opening 20 therefore has a lens-like shape with two curved side surfaces that converge at two opposite pointed ends or edges of the outlet opening 20. Within the scope of the invention, only a single outlet opening 20 is provided. Since a flat jet nozzle 10 is provided according to the invention, the outlet opening 20 is slit-shaped in order to form a flat jet.

[0048] Fig. 2 shows the flat jet nozzle 10 in a further side view, with the housing 12 rotated 90° to the left compared to the view in Fig. 1. In Fig. 2, only one of the actuating wings 16 is visible. It can be seen in Fig. 2 that two recesses 18 for projections of a bayonet fastening device on a connecting flange (not shown) are provided in the connection area 14, with the recesses 18 being opposite one another.

[0049] Fig. 3 shows a bottom view of the flat jet nozzle 10 according to the invention. The view in Fig. 3 is directed toward the slot-shaped outlet opening 20.

[0050] Fig. 4 shows a view of the sectional plane AA in Fig. 2. In the sectional view of Fig. 4, an outlet chamber 22 can be seen within the nozzle housing 12, which has a circular cylindrical section 24, a frustoconical intermediate section 26 tapering in the direction of flow, a further circular cylindrical section 28 and a spherical segment-shaped end section 32. The outlet opening 20 is arranged at the base of the spherical segment-shaped end section 32. In the direction of flow through the flat jet nozzle 10, the circular cylindrical section 24, the frustoconically tapering intermediate section 26, the second circular cylindrical section 28 and the spherical segment-shaped end section follow one another directly in the outlet chamber.The free cross-section of the outlet chamber 22 thus tapers initially in the region of the frustoconical intermediate section 26 and then immediately upstream of the outlet opening 20 in the spherical end section 32.

[0051] A pot-shaped insert 34 extends into the outlet chamber 32. It is provided with several evenly spaced slots on its peripheral wall and a through-opening 36 in its base. The cover of the pot-shaped insert 22 is formed by a diaphragm 38 provided with an inlet opening 40. The inlet opening 40 and the through-opening 36 lie on a common axis, in the illustrated embodiment on the central longitudinal axis 42 of the nozzle housing 12. The outlet chamber 22 is also concentric with the central longitudinal axis 42.

[0052] The flat jet nozzle 10 shows a nozzle for discharging a comparatively small volume flow. A distance 11 between the bottom of the cup-shaped insert 34 and the bottom of the spherical segment-shaped end section 32 is therefore chosen to be comparatively short. This is achieved by attaching the cup-shaped insert 34 to a cup-shaped spacer 44 that is inserted into the nozzle housing 12. A sealing ring 46 is arranged upstream of the cup-shaped spacer 44.

[0053] The liquid to be sprayed enters the flat jet nozzle 10 and the interior volume of the cup-shaped spacer 44 via the connection area 14. The liquid to be sprayed then enters through the inlet opening 40 in the aperture 38 and into the interior of the cup-shaped insert 34. From the interior of the cup-shaped insert 34, the liquid to be sprayed can then enter the outlet chamber 32 through the slots in the peripheral wall of the cup-shaped insert 34 and through the through-opening 36 in the base of the cup-shaped insert 34. The liquid to be sprayed enters the outlet chamber 22. From the outlet chamber 22, the liquid to be sprayed then exits through the outlet opening 20 in the form of a flat jet.

[0054] With the nozzle according to the invention, a very uniform spray distribution across the width of the flat jet or the area of ​​the flat jet can be achieved when the nozzles are used in a cluster, i.e., when several nozzles are used next to each other at a predetermined distance. Furthermore, a flat jet with very coarse droplets is also generated. The spray jet emitted by the flat jet nozzle 10 is therefore subject to very little drift. The flat jet nozzle 10 according to the invention is therefore very well suited for use on agricultural spraying devices.

[0055] A diameter of the inlet opening 40 in the orifice plate 38 is designated Db1 in Fig. 4. A diameter of the through-opening 36 in the bottom of the cup-shaped insert 34 is designated Del in Fig. 4. A diameter of the spherical segment-shaped end section 32 and the circular cylindrical section 28 immediately upstream of the end section 32 is designated Dg1. A distance between the bottom of the cup-shaped insert 34 and the bottom of the end section 32 is designated 11.

[0056] Within the scope of the invention, a cross-sectional area of ​​the through-opening 36 in the bottom of the pot-like insert 34 is between two and nine times larger than a cross-sectional area of ​​the inlet opening 40 in the aperture 38. This means that the diameter Del of the through-opening 36 is between 1.4 and 3 times larger than the diameter Db1 of the inlet opening 40 in the aperture 38.

[0057] Surprisingly, despite the significantly larger through-opening 36 compared to the inlet opening 40, a coarse droplet spectrum can be achieved in the emitted flat jet. Surprisingly, the so-called "shooting through" effect does not occur with the nozzle according to the invention. "Shooting through" is an effect when a liquid jet formed through the inlet opening 40 traverses the interior of the cup-shaped insert 34 essentially unchanged and passes the significantly larger through-opening 36 in the base of the cup-shaped insert 34 essentially unstretched. Precisely this "shooting through" effect is avoided despite the significantly larger through-opening 36 compared to the inlet opening 40, even though the inlet opening 40 and the through-opening 36 are arranged on the central longitudinal axis 42 of the housing 12.Instead, the nozzle according to the invention achieves a very uniform and coarse droplet spectrum in the emitted flat jet.

[0058] Within the scope of the invention, a diameter Dg1 of the spherical segment-shaped end section 32 and the distance 11 from the bottom of the cup-shaped insert 34 to the bottom of the end section 32 are coordinated with one another. Regardless of the power rating of the nozzle 10 according to the invention, i.e., regardless of the volume flow output by the flat jet of the flat jet nozzle 10, the ratio Dg1 to 11 is in the range between 0.4 and 0.6. The flat jet nozzle 10 according to the invention, like the other flat jet nozzles 30, 50 according to the invention described below, is suitable both for use with pulse-width modulated (PWM) inlet valves and for continuous application of the liquid to be sprayed.

[0059] Fig. 5 shows a nozzle 30 according to the invention in accordance with a further embodiment of the invention. The flat jet nozzle 30 is designed to deliver a larger volume flow than the flat jet nozzle 10 of Figs. 1 to 3. Otherwise, the structure of the flat jet nozzle 30 according to the invention is very similar to the structure of the flat jet nozzle 10 according to the invention of Figs. 1 to 3. Therefore, only the differences between the flat jet nozzle 30 of Figs. 5 to 8 and the flat jet nozzle 10 of Figs. 1 to 4 will be explained below. Elements that are designated by the same reference numerals as in the flat jet nozzle 10 of Figs. 1 to 4 have the same function and will not be explained again.

[0060] By comparing Figs. 5 and 1, it can be seen that the outlet opening 20 of the flat jet nozzle 30 of Fig. 5 is somewhat wider than the outlet opening 20 of the flat jet nozzle 10 of Fig. 1. This also ensures that the flat jet nozzle 30 outputs a larger volume flow than the flat jet nozzle 10. The length I2 of the housing 12 of the flat jet nozzle 30 of Figs. 5 to 8 is greater than the length I1 of the flat jet nozzle 10 of Figs. 1 to 4. This primarily increases the length of the outlet chamber 22 and, specifically, see Fig. 8, a distance I2 between the bottom of the pot-shaped insert 34 and the bottom of the spherical segment-shaped end portion 32, in which the outlet opening 20 is arranged, is greater than the distance I1 for the flat jet nozzle 10 of Figs. 1 to 4.

[0061] Fig. 6 shows a side view of the flat jet nozzle 30 rotated by 90° compared to the side view of Fig. 5.

[0062] Fig. 7 shows a view of the flat jet nozzle 30 from below.

[0063] Fig. 8 shows a view of the sectional plane BB in Fig. 6. Fig. 8 shows the cup-shaped spacer 44, to which the cup-shaped insert 34 is connected. The aperture 38 forms the cover of the cup-shaped insert 34. As with the flat jet nozzle 10, the inlet opening 40 in the aperture 38 and the through opening 36 in the base of the cup-shaped insert 34 are arranged on the central longitudinal axis 42 of the housing 12. The inlet opening 40 has a diameter Db2 which is larger than the diameter Db1 of the flat jet nozzle 10. The through opening 36 has a diameter De2 which is larger than the diameter Del of the flat jet nozzle 10. However, the diameter De2 is also 1.4 to 3 times larger than the diameter Db2 and, as a result, a cross-sectional area of ​​the through opening 36 in the bottom of the pot-like insert 34 is between twice and nine times larger than a free cross-sectional area of ​​the inlet opening 40 of the orifice plate 38.

[0064] The diameter Dg2 of the spherical segment-shaped end section 32 is larger than the diameter Dg1 of the end section 32 of the flat jet nozzle 10. The distance I2 between the bottom of the pot-like insert 34 and the bottom of the spherical segment-shaped end section 32 is also larger than in the flat jet nozzle 10. However, the ratio Dg2 / I2 is between 0.4 and 0.6, as in the flat jet nozzle 10.

[0065] Fig. 9 shows a side view of a flat jet nozzle 50 according to the invention in accordance with a third embodiment. The flat jet nozzle 50 has a very similar structure to the flat jet nozzles 10, 30 of Figs. 1 to 8, so only differences from the flat jet nozzles 10, 30 will be explained. Elements designated by the same reference numerals as in the flat jet nozzles 10, 30 of Figs. 1 to 8 have the same function and will not be explained again.

[0066] The housing 12 of the flat jet nozzle 50 has a length I3 that is greater than the length I2 of the housing 12 of the flat jet nozzle 30 and is greater than the length I1 of the housing 12 of the flat jet nozzle 10. This results in a greater length of the outlet chamber 22 of the flat jet nozzle 30 compared to the length of the outlet chambers 22 of the flat jet nozzle 30. The flat jet nozzle 50 is intended for the output of a larger volume flow than the flat jet nozzle 30 and than the flat jet nozzle 10. This can also be seen from the fact that the outlet opening 20 of the flat jet nozzle 50 is somewhat wider and deeper than the outlet opening 20 of the flat jet nozzle 30 in Fig. 5.

[0067] Fig. 10 shows a side view of the flat jet nozzle 50, which is rotated by 90° compared to the illustration in Fig. 9.

[0068] Fig. 11 shows a view of the flat jet nozzle 50 from below.

[0069] Fig. 12 shows a view of the section plane CC in Fig. 10.

[0070] It can be seen that the flat jet nozzle 50 does not have the cup-shaped spacer 44, as was provided for the flat jet nozzles 10, 30. Instead, the cup-shaped insert 34 has been inserted directly into the housing 12, and the sealing ring 46 rests directly on the upper side of the cup-shaped insert 34. However, the cup-shaped insert 34 is designed identically to the cup-shaped insert 34 of the flat jet nozzles 10, 30; in the flat jet nozzle 50, the cup-shaped insert 34 simply has larger dimensions. The cover of the cup-shaped insert 34 is formed by the aperture 38, which is provided with the inlet opening 40. The through-opening 36 is provided in the base of the cup-shaped insert 34. The inlet opening 40 and the through opening 36 lie on a common axis, namely the central longitudinal axis of the housing 12, which is not shown in Fig. 12.

[0071] The outlet opening 20 is also located on the central longitudinal axis of the housing, as is the case with the flat jet nozzles 10, 30.

[0072] Since the cup-shaped spacer has been omitted from the flat jet nozzle 50, a distance I3 between the bottom of the cup-shaped insert 34 and the bottom of the spherical segment-shaped end section 32 of the outlet chamber 22 is greater than in the flat jet nozzles 10, 30. The diameter Dg3 of the end section 32 is also greater than in the flat jet nozzles 10, 30. Nevertheless, the ratio Dg3 / I3 is between 0.4 and 0.6, as in the flat jet nozzles 10, 30 of Figs. 1 to 8.

[0073] The inlet opening 40 has a diameter Db3 which is larger than the diameter of the inlet openings 40 of the flat jet nozzles 10, 30. The diameter De3 of the through-opening 36 in the base of the cup-shaped insert 34 is larger than the diameter of the through-openings 36 in the flat jet nozzles 10, 30. However, in the flat jet nozzle 50 according to the invention, the diameter De3 is also between 1.4 and 3 times larger than the diameter Db3 of the inlet opening 40. Consequently, a free cross-sectional area of ​​the through-opening 36 is also between twice and nine times larger than a free cross-sectional area of ​​the inlet opening 40 in the aperture 38.

[0074] With the flat jet nozzle 50 according to the invention, a flat jet with a very uniform, coarse droplet spectrum can be generated and a uniform spray quantity distribution across the width of the spray jet can also be generated.

[0075] Fig. 13 shows a schematic sectional view of the orifice plate 38. The orifice plate 38 has the inlet opening 40, which has a different diameter Db1, Db2 or Db3 for the flat jet nozzles 10, 30, 50. Within the scope of the invention, the inlet opening 40 can be formed at the downstream end of a channel in the orifice plate 38. As can be seen from Fig. 13, the cross-section of the channel at the upstream beginning of the channel is larger than at the inlet opening 40 at the downstream end of the channel. Fig. 13 also shows that the channel is rounded at the upstream beginning and tapers in the direction of flow. Following the rounded beginning of the channel, it then has a constant cross-section again up to the inlet opening 40.

[0076] Such a design of the channel in the aperture 38 has proven to be advantageous for the flat jet nozzle 10, 30, 50 according to the invention.

[0077] Fig. 14 shows a flat jet nozzle 70 according to the invention according to a fourth embodiment.

[0078] Fig. 15 shows a sectional view of the section plane AA in Fig. 14 of the flat jet nozzle 70. The flat jet nozzle 70 is essentially identical in construction to the flat jet nozzle 10 of Fig. 4, so that only the differences to the flat jet nozzle 10 of Fig. 4 are explained.

[0079] In contrast to the aperture 10 of Fig. 4, a differently designed aperture 60 is inserted into the housing 12 of the flat jet nozzle 70. The aperture 60 will be explained further with reference to Fig. 16 and Fig. 17.

[0080] Otherwise, the flat jet nozzle 70 is constructed identically to the flat jet nozzle 10 of Fig. 4. As with the flat jet nozzle 10 of Fig. 4, the inlet opening 40, which is formed at the downstream end of the channel 62 of the orifice 60, the through opening 36 at the bottom of the cup-shaped insert 22, and the outlet opening 20 are located on the common central axis 42 or share the common central axis 42. In other words, the inlet opening 40, the through opening 36, and the outlet opening 20 are aligned.

[0081] The outlet opening 20 is slit-shaped and consequently has a larger transverse dimension, perpendicular to the plane of the drawing in Fig. 15, and a small transverse dimension kQ. In the embodiment shown in Fig. 15, the through-opening 36 is formed with a circular cross-section and has a diameter Del. According to the invention, a ratio of the diameter Del of the through-opening 36 to the small transverse dimension kQ of the outlet opening 20 can be between 2.5 and 4. In the embodiment shown in Fig. 15, this ratio is 2.94.

[0082] Fig. 16 shows the aperture 60 of the flat jet nozzle 70 in an enlarged view.

[0083] Fig. 17 shows a sectional view of the orifice plate 60 along section plane BB in Fig. 16. The orifice plate 60 can be provided at the same location as the orifice plate 38; see also Fig. 15. In contrast to the orifice plate 38, the orifice plate 60 has a channel 62 that tapers conically in a first section 64, the first section 64 extending from the upstream beginning of the channel 62. In a second section 66, the cross-section of the channel 62 is constant. The second section 66 extends from the end of the first section 64 to the downstream end of the channel 62. The inlet opening 40 is formed at the end of the channel 62. Viewed in the direction of flow, i.e. from top to bottom in Fig. 16 and Fig. 17, the length of the first, tapered section 64 is greater than the length of the second section 66 with a constant cross-section.Within the scope of the invention, a ratio of the length of the tapered section 64 to a length of the section with a constant cross-section 66 can be between 4 and 8. In the illustrated embodiment of Fig. 16 and Fig. 17, the ratio of the length of the first section 64 to the length of the second section 66 is between 5.5 and 6.

[0084] According to the invention, the diameter of the channel 62 at the upstream end, i.e., the top end in Fig. 14, relative to the diameter of the channel 62 at the downstream end, i.e., the bottom end in Fig. 14, can be between 1.5 and 2.5. The frustoconically tapered first section 64 ends at the beginning of the circular-cylindrical second section 66 with a constant diameter.

Claims

Patent claims 1. Flat jet nozzle (10; 30; 50) with a nozzle housing (12), wherein the nozzle housing (12) has an outlet chamber (22), the outlet chamber (22) having an inlet opening (40) formed by means of an orifice (38) and an outlet opening (20), wherein downstream of the inlet opening (40) a cup-shaped insert (34) is provided, the lid of which is formed by means of the orifice (38) and in the base of which a through-opening (36) is arranged, wherein the inlet opening (40) and the through-opening (36) have a common central axis (42), and wherein the outlet opening (20) is arranged downstream of the base of the cup-shaped insert (34), characterized in that a cross-sectional area of ​​the through-opening (36) in the base of the cup-shaped insert (34) is between two and nine times larger than a cross-sectional area of ​​the inlet opening (40). at aperture (38).

2. Flat jet nozzle according to claim 1, characterized in that the inlet opening (40) is formed at the downstream end of a channel in the aperture (38), and that the cross-section of the channel at the upstream beginning of the channel is larger than at the inlet opening (40) at the downstream end of the channel.

3. Flat jet nozzle according to claim 2, characterized in that the channel tapers in a frustoconical shape from the upstream beginning or that the channel is rounded at the upstream beginning and tapers in the direction of flow.

4. Flat jet nozzle according to claim 3, characterized in that the channel has a constant cross-section from the tapered upstream beginning to the inlet opening (40).

5. Flat jet nozzle according to claim 4, characterized in that the tapered section of the channel is longer than the section of the channel with constant cross-section.

6. Flat jet nozzle according to claim 5, characterized in that the ratio of the length of the tapered section to the length of the section with constant cross-section is between 4 and 8, in particular between 5.5 and 6.

7. Flat jet nozzle according to one of claims 2 to 6, characterized in that the ratio of the diameter of the channel at the upstream beginning of the channel to the diameter of the channel at the upstream end is between 1.5 and 2.

5.

8. Flat jet nozzle according to at least one of the preceding claims, characterized in that the outlet opening (20) has the inlet opening (40) and the through opening (36) has the common central axis (42).

9. Flat jet nozzle according to at least one of the preceding claims, characterized in that the outlet chamber (22) has a spherical segment-shaped end section (32) in which the outlet opening (20) is arranged, wherein a diameter (Dg1, Dg2, Dg3) of the spherical segment-shaped end section (32) and a distance (I1 , I2, I3) from the downstream end of the pot-shaped insert (34) are matched to each other, such that a ratio Dg / I of the diameter Dg to the distance I is between 0.4 and 0.

6.

10. Flat jet nozzle according to at least one of the preceding claims, characterized in that the outlet chamber (22) has a cylindrical inlet section which is arranged downstream of the aperture (38).

11. Flat jet nozzle according to at least one of the preceding claims, characterized in that the discharge chamber (22) has a conically tapered intermediate section (26).

12. Flat jet nozzle according to at least one of the preceding claims, characterized in that the discharge chamber (22) has a spherical segment shape has an end section (32) in which the outlet opening (20) is arranged, wherein upstream of the spherical segment end section (32) a circular cylindrical section (28) of the outlet chamber (22) is arranged, the diameter of which corresponds to the diameter of the spherical segment end section (32).

13. Flat jet nozzle according to claims 10, 11 and 12, characterized in that in the outlet chamber (22) the cylindrical inlet section (24), the conically tapered intermediate section (26), the circular cylindrical section (28) and the spherical segment-shaped end section (32) connect to one another in the direction of flow.

14. Flat jet nozzle according to at least one of the preceding claims, characterized in that the outlet opening is slot-shaped and has a small transverse dimension and a large transverse dimension, wherein a ratio of a diameter through passage opening (36) to the small transverse dimension of the outlet opening is between 2.5 and 4.

15. Flat jet nozzle according to at least one of the preceding claims, characterized in that the aperture (38) is arranged at the bottom of a cup-shaped spacer (44), wherein the cup-shaped insert (34) is connected downstream of the aperture (38), wherein the cup-shaped spacer (44) is formed integrally with the cup-shaped insert (34).

16. Flat jet nozzle according to at least one of the preceding claims, characterized in that the bottom of the pot-shaped insert (34) with the through-opening (36) is arranged either upstream of a conically tapered intermediate section (26) of the outlet chamber (22) or in the region of the frustoconically tapered intermediate section (26) of the outlet chamber (22).

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