EP2931434B1 - Fan nozzle - Google Patents

Fan nozzle Download PDF

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Publication number
EP2931434B1
EP2931434B1 EP12809726.8A EP12809726A EP2931434B1 EP 2931434 B1 EP2931434 B1 EP 2931434B1 EP 12809726 A EP12809726 A EP 12809726A EP 2931434 B1 EP2931434 B1 EP 2931434B1
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EP
European Patent Office
Prior art keywords
section
flat
flow channel
nozzle
jet
Prior art date
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Application number
EP12809726.8A
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German (de)
French (fr)
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EP2931434A1 (en
Inventor
Andreas Seibold
Reinhold Diesch
Daniel MANOCCHIO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfred Kaercher SE and Co KG
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Alfred Kaercher SE and Co KG
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Publication of EP2931434A1 publication Critical patent/EP2931434A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/042—Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/048—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like having a flow conduit with, immediately behind the outlet orifice, an elongated cross section, e.g. of oval or elliptic form, of which the major axis is perpendicular to the plane of the jet

Definitions

  • the invention relates to a flat jet nozzle, in particular for a high-pressure cleaning device, with the features of the preamble of claim 1.
  • Such flat jet nozzles are used in order to be able to cover an object with a fanned-out fluid jet.
  • pressurized water may be used as the fluid to which a cleaning chemical may be added.
  • the water jet can be directed to an object to be cleaned, wherein the object can be swept by the fanned water jet.
  • the use of the flat jet nozzles is not limited to pressurized water, for example, such flat jet nozzles can also be used to produce a fanned air or water vapor jet.
  • the air jet can be directed, for example, to an object to be dried.
  • it may be provided that such flat jet nozzles are used on drying devices of vehicle washing systems.
  • Flat-jet nozzles with a slot-shaped nozzle opening are known for forming a flat jet.
  • Such nozzles are for example in the DE 29 27 737 C2 and in the US 6,402,062 B1 described.
  • the beam shaping takes place in such nozzles directly to the slot-shaped nozzle opening.
  • Flat jet nozzles are also known in which a fluid jet which is round at the nozzle opening in cross-section is formed into a flat jet by a subsequent impact on lateral walls. Such nozzles are used, for example, for irrigation of parks.
  • flat jet nozzles are known in which the beam shaping takes place already upstream of the nozzle opening in a beam-forming section of the flow channel.
  • Such nozzles are for example in the EP 0 683 696 B1 and in the DE 694 00 060 T2 described.
  • the beam shaping takes place in that two concave extensions of the flow channel, which otherwise taper continuously in the flow direction of the fluid, are provided diametrically opposite one another directly upstream of the nozzle opening.
  • the lateral extensions lead to a deflection of the fluid in such a way that it has a fanned out jet form after emerging from the nozzle opening.
  • Such flat jet nozzles have proven themselves in practice, however, the fluid undergoes a not inconsiderable flow loss in the flat jet nozzle and the manufacture of the flat jet nozzles is associated with considerable costs due to the elaborate processing of the nozzle body.
  • the flat jet nozzle has a nozzle body, which is penetrated by a flow channel.
  • the flow channel extends from an inlet opening to an outlet opening, wherein its flow cross-section continuously tapers.
  • the outlet port forms a nozzle opening of the flat jet nozzle and has an elongated (elliptical) shape. Upstream of the nozzle opening, the flow channel forms a region in which its flow cross section continuously changes from a circular shape in an elliptical shape.
  • a flat jet nozzle is known with an elliptical nozzle opening, which is immediately upstream of a tapered in the flow direction circular cone-shaped region of a flow channel.
  • a surge shower having a flow passage extending from an inlet opening to an outlet opening.
  • the inlet opening has an elliptical, approximately circular cross section and the outlet opening is configured rectangular.
  • the surge shower is made of a glass fiber reinforced plastic material.
  • Object of the present invention is to develop a flat jet nozzle of the type mentioned in such a way that the fluid is subject to low flow losses in the formation of a flat jet and the flat jet nozzle can be produced inexpensively.
  • a continuous, that is stepless, and edgeless transition of the flow cross-section of the flow channel from a circular shape to an elliptical shape takes place.
  • the flow cross-section decreases the flow channel continuously in the flow direction of the fluid.
  • the continuous reduction of the flow cross-section causes the fluid to be accelerated uniformly. Due to the continuous transition of the flow cross-section from a circular shape into an elliptical shape, the fluid in two diametrically opposite peripheral regions of the beam-forming section is deflected more towards the center of the jet than in the remaining peripheral regions of the beam-shaping section.
  • the fluid forms a flat jet as it passes through the nozzle opening. Since the transition of the flow cross-section which continuously tapers in the flow direction from a circular shape into an elliptical shape takes place continuously without steps or edges, the fluid is accelerated without a detachment of the fluid from the wall of the beam-forming portion. Flow losses can be kept low by the continuous transition.
  • the flat fan nozzle according to the invention is therefore characterized by a low-loss beam shaping. Due to the omission of steps and edges in the interior of the beam-shaping section, the flat-jet nozzle according to the invention can be produced inexpensively, for example, by an injection molding process, it being possible to use a plastic material or alternatively metallic or ceramic materials for the production.
  • the flat fan nozzle according to the invention also has the advantage that with its help, an improved cleaning effect in the vicinity can be achieved, since the flow is focused on the nozzle opening virtually fog-free and precise.
  • the beam-shaping section has an end region immediately upstream of the nozzle opening, in which the flow cross-section of the flow channel is continuous with an elliptical shape in a circular shape, wherein the nozzle opening is also configured circular.
  • a continuous transition of the flow cross-section starting from a circular shape over an ellipse shape, takes place back into a circular shape, the flow cross-section continuously decreasing in the flow direction of the fluid.
  • the flat jet nozzle can be connected, for example, to a jet pipe.
  • the jet pipe can have a circular flow cross section.
  • the contour of the flow channel can continuously taper, starting from the circular shape, a continuous transition first into an ellipse shape and then again in a circular shape, so that the fluid through the also circular Nozzle opening in the form of a flat jet can be discharged to the outside, wherein the fluid accelerates smoothly and without detachment from the wall of the flow channel and flow losses are reduced to a minimum.
  • a shaping of the flow channel with a circular inlet cross-section and a circular nozzle opening simplifies the production of an injection molding tool and the demolding of the flat jet nozzle during its production.
  • the orientation of the main axis of the elliptical shape of the flow cross section remains the same in an advantageous embodiment of the invention along the entire beam forming section.
  • the orientation of the main axis of the elliptical flow cross section in the space along the entire beam-forming section remains unchanged.
  • the nozzle opening has a tear-off edge for the fluid, which is arranged in a plane oriented perpendicular to the longitudinal direction of the flow channel.
  • the flow channel In the region of the nozzle opening, the flow channel has its smallest flow cross-section. The flow of the fluid ruptures at the nozzle opening from the wall of the flow channel.
  • the nozzle opening forms a tear-off edge for this purpose. It is advantageous, in particular for component demoulding, if the tear-off edge is arranged in a plane which is aligned perpendicular to the longitudinal direction of the flow channel.
  • the inner wall of the flow channel is preferably defined by a three-dimensional free-form surface, wherein the curvature of the free-form surface changes continuously, at least in a longitudinal sectional plane of the flow channel.
  • the three-dimensional free-form surface preferably has a constant change in curvature with respect to the flow direction of the fluid.
  • the three-dimensional freeform surface is defined by Bézier curves.
  • Bezier curves are known to the person skilled in the art and therefore require no further explanation in the present case.
  • the flow channel is designed mirror-symmetrically to two longitudinal sectional planes of the flow channel, which are aligned perpendicular to each other.
  • the nozzle opening may have an elongated cross-sectional area.
  • the nozzle opening may be configured, for example, circular.
  • the nozzle opening is designed mirror-symmetrically to two longitudinal sectional planes of the flow channel, which are configured perpendicular to one another.
  • the nozzle opening has a polygonal shape.
  • the flow channel comprises an input section, which is located immediately upstream of the beam-shaping section upstream.
  • the inlet section conveniently has a circular flow cross-section.
  • the flow channel has an extension section which immediately adjoins the nozzle opening in the flow direction of the fluid and in which the flow cross-section of the flow channel widens.
  • the nozzle opening forms the narrowest flow cross-section of the flow channel.
  • the flow channel may extend beyond the nozzle opening in the flow direction of the fluid, the extension section adjoining the nozzle opening.
  • the extension section widens continuously.
  • the extension section widens conically in the flow direction of the fluid.
  • an exit section of the flow channel adjoins the extension section.
  • the output section may be cylindrical, for example.
  • the output section is transverse to the longitudinal direction of the flow channel from one into an end face of the nozzle body molded, penetrated perpendicular to the longitudinal direction of the flow channel extending transverse groove.
  • the transverse groove indicates the orientation of the flat jet and facilitates the insertion and alignment of the flat jet nozzle in a nozzle receptacle, for example in a nozzle receptacle of a jet pipe of a high-pressure cleaning device.
  • the flat jet nozzle is produced in an advantageous embodiment of a metal or ceramic powder.
  • the flat jet nozzle is produced by a powder injection molding process (Powder Injection Molding PIM).
  • a metal or ceramic powder is mixed with a binder, for example a polyolefin wax mixture. This mixture is then brought into the desired shape by injection molding.
  • the binder is removed chemically or thermally so that a molding consisting of a metal or ceramic powder remains, which is subsequently sintered.
  • MIM Metal Injection Molding
  • CIM Ceramic Injection Molding
  • the flat fan nozzle according to the invention is made of a plastic material, in particular of a duroplastic.
  • the preparation can be carried out by a conventional injection molding.
  • FIGS. 1 to 4 schematically a first advantageous embodiment of a flat jet nozzle according to the invention is shown, which is generally occupied by the reference numeral 10. It comprises a nozzle body 12 with a cylindrical upper part 14, to which a frustoconical middle part 16 adjoins, which in turn is followed by a cylindrical lower part 18.
  • the upper part 14 has an upper end face 20 facing away from the middle part 16, and the lower part 18 has a lower end face 22 facing away from the middle part 16.
  • a flow channel 24 extends through the nozzle body 12 to the lower end surface 22.
  • the flow channel 24 has a cylindrical inlet section 26 with a circular flow cross-section. Adjoining the input section 26 is a beam-shaping section 28, which continuously tapers in the flow direction of a fluid through which the flow channel 24 flows, symbolized by the arrow 30, that is, the flow cross-section of the beam-shaping section 28 decreases continuously in the flow direction 30.
  • the beam-shaping section 28 extends to a nozzle opening 32, which is characterized by the smallest flow cross-section of the flow channel 24.
  • Adjoining the nozzle opening 32 in the flow direction 30 is an extension section 34 of the flow channel 24.
  • the extension section 34 is conical, so that its flow cross-section in the flow direction 30, starting from the nozzle opening 32, increases continuously.
  • the expansion section 34 is adjoined in the flow direction 30 by a cylindrical outlet section 36.
  • the flow channel 24 has a longitudinal axis 38. Transverse to the longitudinal axis 38 of the output portion 36 is penetrated by a transverse groove 40 which is formed in the lower end surface 22.
  • the flow area of the beam-shaping section 28 changes continuously. Starting from a circular shape, which has the flow cross-section of the flow channel 24 at the transition between the inlet section 26 and the beam-forming section 28, the flow cross-section of the beam-forming section 28 continuously over a majority of its longitudinal extent in an ellipse shape with ever smaller cross-sectional area, and in an end region of Beam shaping section 28 is a continuous transition from the ellipse shape in a circular shape, which also has the nozzle opening 32.
  • FIG. 3 At six positions of the beam-forming section 28, including the nozzle opening 32, the flow cross-sections of the flow channel 24 are illustrated.
  • the flow channel 24 In position 1 at the transition between the inlet section 26 and the beam-shaping section 28, the flow channel 24 has a circular shape. In the respective positions 2, 3, 4 and 5 arranged at a mutual distance of about 20% of the total length of the beam-forming section 28, the flow channel 24 has an elliptical flow cross-section, wherein the eccentricity of the ellipse continuously increases. In a subsequent end region of the beam shaping section 28, which extends between positions 5 and 6 and has a length of about 20% of the total length of the beam shaping section 28, the flow cross section of the flow channel 24 continuously changes from an ellipse shape to a circular shape. In position 6 of FIG. 2 is the nozzle opening 32, which is designed circular.
  • the fluid flowing through the flow channel 24 experiences, for example pressurized water, a beam shaping such that a flat jet is formed.
  • a beam shaping is achieved by subjecting the fluid in the diametrically opposite circumferential regions of the beam shaping section 28, which are penetrated by the main axis 42 of the elliptical flow cross section, to a stronger deflection in the direction of the longitudinal axis 28 than in the remaining peripheral regions of the beam shaping section 28 are aligned substantially parallel to the main axis 42.
  • the fluid jet passing through the nozzle opening 32 therefore expands fan-shaped transversely to the main axis 42.
  • the inner contour of the beam-shaping section 28 is defined by a three-dimensional free-form surface which, at least in the in FIG. 2 illustrated longitudinal section plane of the flow channel 24 has a continuously changing curvature. The change of the curvature takes place here continuously.
  • the shape of the beam-forming section 28 substantially corresponds to the shape of a continuously narrowing in the flow direction 30 hose, which is pressed together at two diametrically opposite regions.
  • the fluid flowing through the flow channel 24 forms a flat jet, which fanned out in the plane oriented perpendicular to the main axis 42.
  • the flow channel 24 including the nozzle opening 32 is designed mirror-symmetrically to two longitudinal sectional planes perpendicular aligned with each other.
  • a first longitudinal sectional plane runs perpendicular to the main axis 42 and a second longitudinal sectional plane runs perpendicular to the minor axis 44 of the elliptical flow cross section of the beam shaping section 28.
  • the fan jet nozzle 10 is preferably produced by means of a powder injection molding process, wherein a provided with a binder metal or ceramic powder is processed in an injection molding process.
  • a powder injection molding process wherein a provided with a binder metal or ceramic powder is processed in an injection molding process.
  • injection molding is the formed with the binder metal or ceramic powder is formed into a nozzle body which is sintered after previously the binder has been removed.
  • the powder injection molding process the nozzle body 12 can be produced in a cost-effective manner with low manufacturing tolerances.
  • the nozzle body 12 is formed from a plastic material, preferably from a duroplastic, wherein an injection molding process is used for shaping.
  • the flat jet nozzle 10 not only has the advantage that it can be produced inexpensively, but it is also characterized by very low flow losses of the fluid. Since the inner contour of the flow channel 24 has no steps and edges, the fluid dissolves when flowing through the flow channel 24 only at a trailing edge 46 of the nozzle opening 32 from the wall of the flow channel 24.
  • the tear-off edge 46 is arranged in a plane 48 oriented perpendicular to the longitudinal axis 32. Downstream of the nozzle opening 32, the fanning fluid jet is not further influenced by the flow channel 24.
  • the flat jet nozzle 10 thus enables low-loss beam shaping and, owing to its easy formability, can be produced cost-effectively in an injection molding process, in particular in a powder injection molding process. It is particularly suitable for use in a high pressure pressure washer. In this case, it can be used in a nozzle receptacle of a jet pipe of the high-pressure cleaning device.
  • the provision of the transverse groove 40 facilitates insertion.

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  • Nozzles (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Description

Die Erfindung betrifft eine Flachstrahldüse, insbesondere für ein Hochdruckreinigungsgerät, mit den Merkmalen des Oberbegriffes von Patentanspruch 1.The invention relates to a flat jet nozzle, in particular for a high-pressure cleaning device, with the features of the preamble of claim 1.

Derartige Flachstrahldüsen kommen zum Einsatz, um einen Gegenstand mit einem aufgefächerten Fluidstrahl überstreichen zu können. Als Fluid kann beispielsweise unter Druck gesetztes Wasser zum Einsatz kommen, dem eine Reinigungschemikalie beigefügt sein kann. Der Wasserstrahl kann auf einen zu reinigenden Gegenstand gerichtet werden, wobei der Gegenstand vom aufgefächerten Wasserstrahl überstrichen werden kann. Der Einsatz der Flachstrahldüsen ist jedoch nicht auf unter Druck gesetztes Wasser beschränkt, beispielsweise können derartige Flachstrahldüsen auch zur Erzeugung eines aufgefächerten Luft- oder Wasserdampfstrahles zum Einsatz kommen. Der Luftstrahl kann beispielsweise auf einen zu trocknenden Gegenstand gerichtet werden. So kann beispielsweise vorgesehen sein, dass derartige Flachstrahldüsen an Trocknungsgeräten von Fahrzeugwaschanlagen Verwendung finden.Such flat jet nozzles are used in order to be able to cover an object with a fanned-out fluid jet. For example, pressurized water may be used as the fluid to which a cleaning chemical may be added. The water jet can be directed to an object to be cleaned, wherein the object can be swept by the fanned water jet. However, the use of the flat jet nozzles is not limited to pressurized water, for example, such flat jet nozzles can also be used to produce a fanned air or water vapor jet. The air jet can be directed, for example, to an object to be dried. For example, it may be provided that such flat jet nozzles are used on drying devices of vehicle washing systems.

Zur Formung eines Flachstrahles sind Flachstrahldüsen mit einer schlitzförmigen Düsenöffnung bekannt. Derartige Düsen sind beispielsweise in der DE 29 27 737 C2 und in der US 6,402,062 B1 beschrieben. Die Strahlformung erfolgt bei derartigen Düsen unmittelbar an der schlitzförmigen Düsenöffnung.Flat-jet nozzles with a slot-shaped nozzle opening are known for forming a flat jet. Such nozzles are for example in the DE 29 27 737 C2 and in the US 6,402,062 B1 described. The beam shaping takes place in such nozzles directly to the slot-shaped nozzle opening.

Es sind auch Flachstrahldüsen bekannt, bei denen ein an der Düsenöffnung im Querschnitt runder Fluidstrahl durch einen nachfolgenden Aufprall auf seitliche Wände zu einem Flachstrahl geformt wird. Derartige Düsen kommen beispielsweise zur Bewässerung von Grünanlagen zum Einsatz.Flat jet nozzles are also known in which a fluid jet which is round at the nozzle opening in cross-section is formed into a flat jet by a subsequent impact on lateral walls. Such nozzles are used, for example, for irrigation of parks.

Darüber hinaus sind Flachstrahldüsen bekannt, bei denen die Strahlformung bereits stromaufwärts der Düsenöffnung in einem Strahlformungsabschnitt des Strömungskanals erfolgt. Derartige Düsen sind beispielsweise in der EP 0 683 696 B1 und in der DE 694 00 060 T2 beschrieben. Die Strahlformung erfolgt dadurch, dass unmittelbar stromaufwärts der Düsenöffnung einander diametral gegenüberliegend zwei konkave Erweiterungen des sich ansonsten in Strömungsrichtung des Fluids kontinuierlich verjüngenden Strömungskanals vorgesehen sind. Die seitlichen Erweiterungen führen zu einer Umlenkung des Fluids dergestalt, dass dieses nach Austritt aus der Düsenöffnung eine aufgefächerte Strahlform aufweist. Derartige Flachstrahldüsen haben sich in der Praxis bewährt, allerdings erfährt das Fluid in der Flachstrahldüse einen nicht unerheblichen Strömungsverlust und die Herstellung der Flachstrahldüsen ist aufgrund der aufwändigen Bearbeitung des Düsenkörpers mit beträchtlichen Kosten verbunden.In addition, flat jet nozzles are known in which the beam shaping takes place already upstream of the nozzle opening in a beam-forming section of the flow channel. Such nozzles are for example in the EP 0 683 696 B1 and in the DE 694 00 060 T2 described. The beam shaping takes place in that two concave extensions of the flow channel, which otherwise taper continuously in the flow direction of the fluid, are provided diametrically opposite one another directly upstream of the nozzle opening. The lateral extensions lead to a deflection of the fluid in such a way that it has a fanned out jet form after emerging from the nozzle opening. Such flat jet nozzles have proven themselves in practice, however, the fluid undergoes a not inconsiderable flow loss in the flat jet nozzle and the manufacture of the flat jet nozzles is associated with considerable costs due to the elaborate processing of the nozzle body.

Aus der EP 1 293 258 A1 ist eine Flachstrahldüse mit den Merkmalen des Oberbegriffes von Patentanspruch 1 bekannt. Die Flachstrahldüse weist einen Düsenkörper auf, der von einem Strömungskanal durchsetzt ist. Der Strömungskanal erstreckt sich von einer Einlassöffnung bis zu einer Auslassöffnung, wobei sich sein Strömungsquerschnitt kontinuierlich verjüngt. Die Auslassöffnung bildet eine Düsenöffnung der Flachstrahldüse aus und weist eine längliche (elliptische) Form auf. Stromaufwärts der Düsenöffnung bildet der Strömungskanal einen Bereich, in dem sein Strömungsquerschnitt kontinuierlich von einer Kreisform in einer Ellipsenform übergeht.From the EP 1 293 258 A1 a flat jet nozzle with the features of the preamble of claim 1 is known. The flat jet nozzle has a nozzle body, which is penetrated by a flow channel. The flow channel extends from an inlet opening to an outlet opening, wherein its flow cross-section continuously tapers. The outlet port forms a nozzle opening of the flat jet nozzle and has an elongated (elliptical) shape. Upstream of the nozzle opening, the flow channel forms a region in which its flow cross section continuously changes from a circular shape in an elliptical shape.

Aus DE 696 22 835 T2 sowie aus US 4,619,402 A und US 2,125,445 A sind Flachstrahldüsen bekannt mit einer länglichen (elliptischen) Düsenöffnung und einem der Düsenöffnung vorgelagerten Bereich mit ellipsenförmigem Strömungsquerschnitt.Out DE 696 22 835 T2 as well as out US 4,619,402 A and US 2,125,445 A Flat fan nozzles are known with an elongated (elliptical) nozzle opening and a region of the nozzle opening upstream of elliptical flow cross-section.

Aus der DE 10 2007 024 245 B3 ist eine Flachstrahldüse bekannt mit einer elliptischen Düsenöffnung, der ein sich in Strömungsrichtung verjüngender kreiskegelförmiger Bereich eines Strömungskanals unmittelbar vorgelagert ist.From the DE 10 2007 024 245 B3 a flat jet nozzle is known with an elliptical nozzle opening, which is immediately upstream of a tapered in the flow direction circular cone-shaped region of a flow channel.

Aus der DE 20 2005 010 110 U1 ist eine Schwalldusche bekannt mit einem Strömungskanal, der sich von einer Einlassöffnung bis zu einer Auslassöffnung erstreckt. Die Einlassöffnung weist einen elliptischen, annähernd runden Querschnitt auf und die Auslassöffnung ist rechteckförmig ausgestaltet. Die Schwalldusche ist aus einem glasfaserverstärkten Kunststoffmaterial gefertigt.From the DE 20 2005 010 110 U1 For example, a surge shower is known having a flow passage extending from an inlet opening to an outlet opening. The inlet opening has an elliptical, approximately circular cross section and the outlet opening is configured rectangular. The surge shower is made of a glass fiber reinforced plastic material.

Aufgabe der vorliegenden Erfindung ist es, eine Flachstrahldüse der eingangs genannten Art derart weiterzubilden, dass das Fluid bei der Bildung eines Flachstrahls nur geringen Strömungsverlusten unterliegt und die Flachstrahldüse kostengünstig hergestellt werden kann.Object of the present invention is to develop a flat jet nozzle of the type mentioned in such a way that the fluid is subject to low flow losses in the formation of a flat jet and the flat jet nozzle can be produced inexpensively.

Diese Aufgabe durch eine Flachstrahldüse mit den Merkmalen von Patentanspruch 1 gelöst.This object is achieved by a flat jet nozzle with the features of claim 1.

Bei der erfindungsgemäßen Flachstrahldüse erfolgt im Strahlformungsabschnitt des Strömungskanals ein kontinuierlicher, das heißt stufenloser und kantenloser Übergang des Strömungsquerschnitts des Strömungskanals von einer Kreisform in eine Ellipsenform. Gleichzeitig verkleinert sich der Strömungsquerschnitt des Strömungskanals kontinuierlich in Strömungsrichtung des Fluids. Die kontinuierliche Verkleinerung des Strömungsquerschnitts führt dazu, dass das Fluid gleichmäßig beschleunigt wird. Aufgrund des kontinuierlichen Übergangs des Strömungsquerschnitts ausgehend von einer Kreisform in eine Ellipsenform wird das Fluid in zwei einander diametral gegenüberliegenden Umfangsbereichen des Strahlformungsabschnitts stärker in Richtung Strahlmitte umgelenkt als in den restlichen Umfangsbereichen des Strahlformungsabschnitts. Dies führt dazu, dass das Fluid beim Hindurchtreten durch die Düsenöffnung einen Flachstrahl ausbildet. Da der Übergang des sich in Strömungsrichtung kontinuierlich verjüngenden Strömungsquerschnitts von einer Kreisform in eine Ellipsenform kontinuierlich ohne Stufen oder Kanten erfolgt, wird das Fluid beschleunigt ohne dass eine Ablösung des Fluids von der Wand des Strahlformungsabschnitts erfolgt. Strömungsverluste können durch den kontinuierlichen Übergang gering gehalten werden. Die erfindungsgemäße Flachstrahldüse zeichnet sich daher durch eine verlustarme Strahlformung aus. Aufgrund des Wegfalls von Stufen und Kanten im Inneren des Strahlformungsabschnitts kann die erfindungsgemäße Flachstrahldüse kostengünstig beispielsweise durch ein Spritzgießverfahren hergestellt werden, wobei zur Herstellung ein Kunststoffmaterial oder alternativ metallische oder keramische Werkstoffe verwendet werden können. Die erfindungsgemäße Flachstrahldüse hat außerdem den Vorteil, dass mit ihrer Hilfe eine verbesserte Reinigungswirkung im Nahbereich erzielt werden kann, da die Strömung an der Düsenöffnung praktisch nebelfrei und präzise fokussiert ist.In the flat-jet nozzle according to the invention, in the beam-shaping section of the flow channel, a continuous, that is stepless, and edgeless transition of the flow cross-section of the flow channel from a circular shape to an elliptical shape takes place. At the same time, the flow cross-section decreases the flow channel continuously in the flow direction of the fluid. The continuous reduction of the flow cross-section causes the fluid to be accelerated uniformly. Due to the continuous transition of the flow cross-section from a circular shape into an elliptical shape, the fluid in two diametrically opposite peripheral regions of the beam-forming section is deflected more towards the center of the jet than in the remaining peripheral regions of the beam-shaping section. As a result, the fluid forms a flat jet as it passes through the nozzle opening. Since the transition of the flow cross-section which continuously tapers in the flow direction from a circular shape into an elliptical shape takes place continuously without steps or edges, the fluid is accelerated without a detachment of the fluid from the wall of the beam-forming portion. Flow losses can be kept low by the continuous transition. The flat fan nozzle according to the invention is therefore characterized by a low-loss beam shaping. Due to the omission of steps and edges in the interior of the beam-shaping section, the flat-jet nozzle according to the invention can be produced inexpensively, for example, by an injection molding process, it being possible to use a plastic material or alternatively metallic or ceramic materials for the production. The flat fan nozzle according to the invention also has the advantage that with its help, an improved cleaning effect in the vicinity can be achieved, since the flow is focused on the nozzle opening virtually fog-free and precise.

Gemäß der Erfindung weist der Strahlformungsabschnitt einen der Düsenöffnung stromaufwärts unmittelbar vorgelagerten Endbereich auf, in dem der Strömungsquerschnitt des Strömungskanals kontinuierlich von einer Ellipsenform in eine Kreisform übergeht, wobei die Düsenöffnung ebenfalls kreisförmig ausgestaltet ist. Bei einer derartigen Formgebung erfolgt ein kontinuierlicher Übergang des Strömungsquerschnitts ausgehend von einer Kreisform über eine Ellipsenform zurück in eine Kreisform, wobei sich der Strömungsquerschnitt in Strömungsrichtung des Fluids kontinuierlich verringert. Die Flachstrahldüse kann beispielsweise an ein Strahlrohr angeschlossen sein. Das Strahlrohr kann einen kreisförmigen Strömungsquerschnitt aufweisen. Ausgehend von einem kreisförmigen Eintrittsquerschnitt, der sich an das Strahlrohr anschließt, kann sich die Kontur des Strömungskanals kontinuierlich verjüngen, wobei ausgehend von der Kreisform ein kontinuierlicher Übergang zunächst in eine Ellipsenform und anschließend wieder in eine Kreisform erfolgt, so dass das Fluid durch die ebenfalls kreisförmige Düsenöffnung in Form eines Flachstrahls nach außen abgegeben werden kann, wobei sich das Fluid gleichmäßig und ohne Ablösung von der Wand des Strömungskanals beschleunigt und Strömungsverluste auf ein Minimum reduziert sind.According to the invention, the beam-shaping section has an end region immediately upstream of the nozzle opening, in which the flow cross-section of the flow channel is continuous with an elliptical shape in a circular shape, wherein the nozzle opening is also configured circular. In such a shaping, a continuous transition of the flow cross-section, starting from a circular shape over an ellipse shape, takes place back into a circular shape, the flow cross-section continuously decreasing in the flow direction of the fluid. The flat jet nozzle can be connected, for example, to a jet pipe. The jet pipe can have a circular flow cross section. Starting from a circular inlet cross-section, which adjoins the jet pipe, the contour of the flow channel can continuously taper, starting from the circular shape, a continuous transition first into an ellipse shape and then again in a circular shape, so that the fluid through the also circular Nozzle opening in the form of a flat jet can be discharged to the outside, wherein the fluid accelerates smoothly and without detachment from the wall of the flow channel and flow losses are reduced to a minimum.

Eine Formgebung des Strömungskanals mit kreisförmigem Eintrittsquerschnitt und kreisförmiger Düsenöffnung vereinfacht die Herstellung eines Spritzgusswerkzeugs und die Entformung der Flachstrahldüse bei ihrer Herstellung.A shaping of the flow channel with a circular inlet cross-section and a circular nozzle opening simplifies the production of an injection molding tool and the demolding of the flat jet nozzle during its production.

Die Ausrichtung der Hauptachse der Ellipsenform des Strömungsquerschnitts bleibt bei einer vorteilhaften Ausgestaltung der Erfindung entlang des gesamten Strahlformungsabschnittes gleich. Bei einer derartigen Ausgestaltung bleibt die Ausrichtung der Hauptachse des ellipsenförmigen Strömungsquerschnitts im Raum entlang des gesamten Strahlformungsabschnitts unverändert.The orientation of the main axis of the elliptical shape of the flow cross section remains the same in an advantageous embodiment of the invention along the entire beam forming section. In such an embodiment, the orientation of the main axis of the elliptical flow cross section in the space along the entire beam-forming section remains unchanged.

Von Vorteil ist es, wenn die Düsenöffnung eine Abrisskante für das Fluid aufweist, die in einer senkrecht zur Längsrichtung des Strömungskanals ausgerichteten Ebene angeordnet ist. Im Bereich der Düsenöffnung weist der Strömungskanal seinen kleinsten Strömungsquerschnitt auf. Die Strömung des Fluids reißt an der Düsenöffnung von der Wand des Strömungskanals ab. Die Düsenöffnung bildet hierzu eine Abrisskante aus. Von Vorteil insbesondere für die Bauteil-Entformung ist es, wenn die Abrisskante in einer Ebene angeordnet ist, die senkrecht zur Längsrichtung des Strömungskanals ausgerichtet ist.It is advantageous if the nozzle opening has a tear-off edge for the fluid, which is arranged in a plane oriented perpendicular to the longitudinal direction of the flow channel. In the region of the nozzle opening, the flow channel has its smallest flow cross-section. The flow of the fluid ruptures at the nozzle opening from the wall of the flow channel. The nozzle opening forms a tear-off edge for this purpose. It is advantageous, in particular for component demoulding, if the tear-off edge is arranged in a plane which is aligned perpendicular to the longitudinal direction of the flow channel.

Die Innenwand des Strömungskanals wird vorzugsweise durch eine dreidimensionale Freiformfläche definiert, wobei sich die Krümmung der Freiformfläche zumindest in einer Längsschnittebene des Strömungskanals kontinuierlich ändert.The inner wall of the flow channel is preferably defined by a three-dimensional free-form surface, wherein the curvature of the free-form surface changes continuously, at least in a longitudinal sectional plane of the flow channel.

Vorzugsweise weist die dreidimensionale Freiformfläche eine stetige Krümmungsänderung auf bezogen auf die Strömungsrichtung des Fluids.The three-dimensional free-form surface preferably has a constant change in curvature with respect to the flow direction of the fluid.

Es kann vorgesehen sein, dass die dreidimensionale Freiformfläche durch Bézier-Kurven definiert wird. Derartige Bezier-Kurven sind dem Fachmann bekannt und bedürfen daher vorliegend keiner näheren Erläuterung.It can be provided that the three-dimensional freeform surface is defined by Bézier curves. Such Bezier curves are known to the person skilled in the art and therefore require no further explanation in the present case.

Günstig ist es, wenn der Strömungskanal spiegelsymmetrisch zu zwei Längsschnittebenen des Strömungskanals ausgestaltet ist, die senkrecht zueinander ausgerichtet sind.It is advantageous if the flow channel is designed mirror-symmetrically to two longitudinal sectional planes of the flow channel, which are aligned perpendicular to each other.

Wie bereits erwähnt, ist es nicht zwingend erforderlich, dass die Düsenöffnung eine längliche Querschnittsfläche aufweist. Die Düsenöffnung kann beispielsweise kreisförmig ausgestaltet sein.As already mentioned, it is not absolutely necessary for the nozzle opening to have an elongated cross-sectional area. The nozzle opening may be configured, for example, circular.

Es ist von Vorteil, wenn die Düsenöffnung spiegelsymmetrisch zu zwei Längsschnittebenen des Strömungskanals ausgestaltet ist, die senkrecht zueinander ausgestaltet sind.It is advantageous if the nozzle opening is designed mirror-symmetrically to two longitudinal sectional planes of the flow channel, which are configured perpendicular to one another.

Es kann vorgesehen sein, dass die Düsenöffnung eine eckige Gestalt aufweist.It can be provided that the nozzle opening has a polygonal shape.

Der Strömungskanal umfasst bei einer vorteilhaften Ausführungsform der Erfindung einen Eingangsabschnitt, der dem Strahlformungsabschnitt stromaufwärts unmittelbar vorgelagert ist.In an advantageous embodiment of the invention, the flow channel comprises an input section, which is located immediately upstream of the beam-shaping section upstream.

Der Eingangsabschnitt weist günstigerweise einen kreisförmigen Strömungsquerschnitt auf.The inlet section conveniently has a circular flow cross-section.

Von Vorteil ist es, wenn der Strömungskanal einen Erweiterungsabschnitt aufweist, der sich in Strömungsrichtung des Fluids an die Düsenöffnung unmittelbar anschließt und in dem sich der Strömungsquerschnitt des Strömungskanals erweitert. Die Düsenöffnung bildet den engsten Strömungsquerschnitt des Strömungskanals. Der Strömungskanal kann sich in Strömungsrichtung des Fluids über die Düsenöffnung hinaus erstrecken, wobei sich an die Düsenöffnung der Erweiterungsabschnitt anschließt.It is advantageous if the flow channel has an extension section which immediately adjoins the nozzle opening in the flow direction of the fluid and in which the flow cross-section of the flow channel widens. The nozzle opening forms the narrowest flow cross-section of the flow channel. The flow channel may extend beyond the nozzle opening in the flow direction of the fluid, the extension section adjoining the nozzle opening.

Vorteilhafterweise erweitert sich der Erweiterungsabschnitts kontinuierlich.Advantageously, the extension section widens continuously.

Insbesondere kann vorgesehen sein, dass sich der Erweiterungsabschnitt in Strömungsrichtung des Fluids konisch erweitert.In particular, it can be provided that the extension section widens conically in the flow direction of the fluid.

An den Erweiterungsabschnitt schließt sich bei einer vorteilhaften Ausführungsform der Erfindung ein Ausgangsabschnitt des Strömungskanals an.In an advantageous embodiment of the invention, an exit section of the flow channel adjoins the extension section.

Der Ausgangsabschnitt kann beispielsweise zylindrisch ausgebildet sein.The output section may be cylindrical, for example.

Bei einer bevorzugten Ausgestaltung wird der Ausgangsabschnitt quer zur Längsrichtung des Strömungskanals von einer in eine Stirnfläche des Düsenkörpers eingeformten, sich senkrecht zur Längsrichtung des Strömungskanals erstreckenden Quernut durchgriffen. Die Quernut gibt die Ausrichtung des Flachstrahls an und erleichtert das Einsetzen und Ausrichten der Flachstrahldüse in eine Düsenaufnahme, beispielsweise in eine Düsenaufnahme eines Strahlrohrs eines Hochdruckreinigungsgerätes.In a preferred embodiment, the output section is transverse to the longitudinal direction of the flow channel from one into an end face of the nozzle body molded, penetrated perpendicular to the longitudinal direction of the flow channel extending transverse groove. The transverse groove indicates the orientation of the flat jet and facilitates the insertion and alignment of the flat jet nozzle in a nozzle receptacle, for example in a nozzle receptacle of a jet pipe of a high-pressure cleaning device.

Die Flachstrahldüse ist bei einer vorteilhaften Ausgestaltung aus einem Metalloder Keramikpulver hergestellt. Es kann beispielsweise vorgesehen sein, dass die Flachstrahldüse durch ein Pulverspritzgießverfahren (Powder Injection Moulding PIM) hergestellt wird. Bei einem derartigen Verfahren wird ein Metall- oder Keramikpulver mit einem Binder vermischt, beispielsweise einer Polyolefin-Wachsmischung. Diese Mischung wird dann durch Spritzgießen in die gewünschte Form gebracht. In einem anschließenden Verfahrensschritt wird der Binder chemisch oder thermisch entfernt, so dass ein aus einem Metalloder Keramikpulver bestehendes Formteil zurückbleibt, das anschließend gesintert wird. Derartige Pulverspritzgießverfahren werden bei Einsatz von Metallpulver als MIM (Metal Injection Moulding)-Verfahren und im Falle von Keramikpulver als CIM (Ceramic Injection Moulding)-Verfahren bezeichnet.The flat jet nozzle is produced in an advantageous embodiment of a metal or ceramic powder. It can be provided, for example, that the flat jet nozzle is produced by a powder injection molding process (Powder Injection Molding PIM). In such a process, a metal or ceramic powder is mixed with a binder, for example a polyolefin wax mixture. This mixture is then brought into the desired shape by injection molding. In a subsequent process step, the binder is removed chemically or thermally so that a molding consisting of a metal or ceramic powder remains, which is subsequently sintered. Such powder injection molding processes are referred to when using metal powder as MIM (Metal Injection Molding) method and in the case of ceramic powder as CIM (Ceramic Injection Molding) method.

Alternativ kann vorgesehen sein, dass die erfindungsgemäße Flachstrahldüse aus einem Kunststoffmaterial, insbesondere aus einem Duroplast, hergestellt ist. Die Herstellung kann durch ein übliches Spritzgießverfahren erfolgen.Alternatively it can be provided that the flat fan nozzle according to the invention is made of a plastic material, in particular of a duroplastic. The preparation can be carried out by a conventional injection molding.

Die nachfolgende Beschreibung einer vorteilhaften Ausführungsform der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:

Figur 1:
eine teilweise aufgeschnittene perspektivische Darstellung einer erfindungsgemäßen Flachstrahldüse;
Figur 2:
eine Schnittansicht der Flachstrahldüse entlang der Linie 2-2 in Figur 1;
Figur 3:
eine Schnittansicht der Flachstrahldüse entlang der Linie 3-3 von Figur 1, wobei eine Folge von Strömungsquerschnitten, die ein Strömungskanal an verschiedenen Positionen aufweist, schematisch dargestellt ist;
Figur 4:
eine Draufsicht auf die Flachstrahldüse aus Figur 1, wobei die in Figur 3 dargestellten Strömungsquerschnitte des Strömungskanals veranschaulicht sind.
The following description of an advantageous embodiment of the invention is used in conjunction with the drawings for further explanation. Show it:
FIG. 1:
a partially cutaway perspective view of a flat jet nozzle according to the invention;
FIG. 2:
a sectional view of the fan nozzle along the line 2-2 in FIG. 1 ;
FIG. 3:
a sectional view of the fan nozzle along the line 3-3 of FIG. 1 wherein a sequence of flow cross sections having a flow channel at different positions is shown schematically;
FIG. 4:
a plan view of the flat jet nozzle FIG. 1 , wherein the flow cross sections of the flow channel shown in Figure 3 are illustrated.

In den Figuren 1 bis 4 ist schematisch eine erste vorteilhafte Ausführungsform einer erfindungsgemäßen Flachstrahldüse dargestellt, die insgesamt mit dem Bezugszeichen 10 belegt ist. Sie umfasst einen Düsenkörper 12 mit einem zylindrischen Oberteil 14, an das sich ein kegelstumpfförmiges Mittelteil 16 anschließt, an das sich wiederum ein zylindrisches Unterteil 18 anschließt. Das Oberteil 14 weist eine dem Mittelteil 16 abgewandte obere Endfläche 20 auf und das Unterteil 18 weist eine dem Mittelteil 16 abgewandte untere Endfläche 22 auf.In the FIGS. 1 to 4 schematically a first advantageous embodiment of a flat jet nozzle according to the invention is shown, which is generally occupied by the reference numeral 10. It comprises a nozzle body 12 with a cylindrical upper part 14, to which a frustoconical middle part 16 adjoins, which in turn is followed by a cylindrical lower part 18. The upper part 14 has an upper end face 20 facing away from the middle part 16, and the lower part 18 has a lower end face 22 facing away from the middle part 16.

Von der oberen Endfläche 20 erstreckt sich ein Strömungskanal 24 durch den Düsenkörper 12 hindurch bis zur unteren Endfläche 22. Der Strömungskanal 24 weist einen zylindrischen Eingangsabschnitt 26 mit kreisförmigem Strömungsquerschnitt auf. An den Eingangsabschnitt 26 schließt sich ein Strahlformungsabschnitt 28 an, der sich in der durch den Pfeil 30 symbolisierten Strömungsrichtung eines Fluids, das den Strömungskanal 24 durchströmt, kontinuierlich verjüngt, das heißt der Strömungsquerschnitt des Strahlformungsabschnitts 28 verringert sich in Strömungsrichtung 30 kontinuierlich.From the upper end surface 20, a flow channel 24 extends through the nozzle body 12 to the lower end surface 22. The flow channel 24 has a cylindrical inlet section 26 with a circular flow cross-section. Adjoining the input section 26 is a beam-shaping section 28, which continuously tapers in the flow direction of a fluid through which the flow channel 24 flows, symbolized by the arrow 30, that is, the flow cross-section of the beam-shaping section 28 decreases continuously in the flow direction 30.

Der Strahlformungsabschnitt 28 erstreckt sich bis zu einer Düsenöffnung 32, die sich durch den kleinsten Strömungsquerschnitt des Strömungskanals 24 auszeichnet.The beam-shaping section 28 extends to a nozzle opening 32, which is characterized by the smallest flow cross-section of the flow channel 24.

An die Düsenöffnung 32 schließt sich in Strömungsrichtung 30 ein Erweiterungsabschnitt 34 des Strömungskanals 24 an. Der Erweiterungsabschnitt 34 ist konisch ausgebildet, so dass sich sein Strömungsquerschnitt in Strömungsrichtung 30 ausgehend von der Düsenöffnung 32 kontinuierlich vergrößert. An den Erweiterungsabschnitt 34 schließt sich in Strömungsrichtung 30 ein zylindrischer Ausgangsabschnitt 36 an.Adjoining the nozzle opening 32 in the flow direction 30 is an extension section 34 of the flow channel 24. The extension section 34 is conical, so that its flow cross-section in the flow direction 30, starting from the nozzle opening 32, increases continuously. The expansion section 34 is adjoined in the flow direction 30 by a cylindrical outlet section 36.

Der Strömungskanal 24 weist eine Längsachse 38 auf. Quer zur Längsachse 38 wird der Ausgangsabschnitt 36 von einer Quernut 40 durchgriffen, die in die untere Endfläche 22 eingeformt ist.The flow channel 24 has a longitudinal axis 38. Transverse to the longitudinal axis 38 of the output portion 36 is penetrated by a transverse groove 40 which is formed in the lower end surface 22.

Der Strömungsquerschnitt des Strahlformungsabschnitts 28 ändert sich kontinuierlich. Ausgehend von einer Kreisform, die der Strömungsquerschnitt des Strömungskanals 24 am Übergang zwischen dem Eingangsabschnitt 26 und dem Strahlformungsabschnitt 28 aufweist, geht der Strömungsquerschnitt des Strahlformungsabschnitts 28 über einen Großteil seiner Längserstreckung kontinuierlich in eine Ellipsenform mit immer kleiner werdender Querschnittsfläche über, und in einem Endbereich des Strahlformungsabschnitts 28 erfolgt ein kontinuierlicher Übergang von der Ellipsenform in eine Kreisform, die auch die Düsenöffnung 32 aufweist. In Figur 3 sind an sechs Positionen des Strahlformungsabschnitts 28 einschließlich der Düsenöffnung 32 die Strömungsquerschnitte des Strömungskanals 24 veranschaulicht. In der Position 1 am Übergang zwischen dem Eingangsabschnitt 26 und dem Strahlformungsabschnitt 28 weist der Strömungskanal 24 eine Kreisform auf. In den jeweils in einem gegenseitigen Abstand von etwa 20% der Gesamtlänge des Strahlformungsabschnitts 28 angeordneten Positionen 2, 3, 4 und 5 weist der Strömungskanal 24 einen ellipsenförmigen Strömungsquerschnitt auf, wobei sich die Exzentrizität der Ellipse kontinuierlich erhöht. In einem anschließenden Endbereich des Strahlformungsabschnitts 28, der sich zwischen den Positionen 5 und 6 erstreckt und eine Länge von etwa 20% der Gesamtlänge des Strahlformungsabschnitts 28 aufweist, geht der Strömungsquerschnitt des Strömungskanals 24 kontinuierlich von einer Ellipsenform in eine Kreisform über. In der Position 6 von Figur 2 befindet sich die Düsenöffnung 32, die kreisförmig ausgestaltet ist.The flow area of the beam-shaping section 28 changes continuously. Starting from a circular shape, which has the flow cross-section of the flow channel 24 at the transition between the inlet section 26 and the beam-forming section 28, the flow cross-section of the beam-forming section 28 continuously over a majority of its longitudinal extent in an ellipse shape with ever smaller cross-sectional area, and in an end region of Beam shaping section 28 is a continuous transition from the ellipse shape in a circular shape, which also has the nozzle opening 32. In FIG. 3 At six positions of the beam-forming section 28, including the nozzle opening 32, the flow cross-sections of the flow channel 24 are illustrated. In position 1 at the transition between the inlet section 26 and the beam-shaping section 28, the flow channel 24 has a circular shape. In the respective positions 2, 3, 4 and 5 arranged at a mutual distance of about 20% of the total length of the beam-forming section 28, the flow channel 24 has an elliptical flow cross-section, wherein the eccentricity of the ellipse continuously increases. In a subsequent end region of the beam shaping section 28, which extends between positions 5 and 6 and has a length of about 20% of the total length of the beam shaping section 28, the flow cross section of the flow channel 24 continuously changes from an ellipse shape to a circular shape. In position 6 of FIG. 2 is the nozzle opening 32, which is designed circular.

Durch den kontinuierlichen Übergang des Strömungsquerschnitts ausgehend von einer Kreisform in eine Ellipsenform innerhalb des Strahlformungsabschnitts 28 erfährt das dem Strömungskanal 24 durchströmende Fluid, beispielsweise unter Druck gesetztes Wasser, eine Strahlformung dergestalt, dass sich ein Flachstrahl ausbildet. Eine derartige Strahlformung wird dadurch erzielt, dass das Fluid in den einander diametral gegenüberliegenden Umfangsbereichen des Strahlformungsabschnitts 28, die von der Hauptachse 42 des elliptischen Strömungsquerschnitts durchgriffen werden, einer stärkeren Umlenkung in Richtung der Längsachse 28 unterliegen als in den restlichen Umfangsbereichen des Strahlformungsabschnitts 28, die im Wesentlichen parallel zur Hauptachse 42 ausgerichtet sind. Der durch die Düsenöffnung 32 hindurchtretende Fluidstrahl erweitert sich daher fächerförmig quer zur Hauptachse 42.Due to the continuous transition of the flow cross-section starting from a circular shape into an elliptical shape within the beam-forming section 28, the fluid flowing through the flow channel 24 experiences, for example pressurized water, a beam shaping such that a flat jet is formed. Such a beam shaping is achieved by subjecting the fluid in the diametrically opposite circumferential regions of the beam shaping section 28, which are penetrated by the main axis 42 of the elliptical flow cross section, to a stronger deflection in the direction of the longitudinal axis 28 than in the remaining peripheral regions of the beam shaping section 28 are aligned substantially parallel to the main axis 42. The fluid jet passing through the nozzle opening 32 therefore expands fan-shaped transversely to the main axis 42.

Die Innenkontur des Strahlformungsabschnitts 28 wird von einer dreidimensionalen Freiformfläche definiert, die zumindest in der in Figur 2 dargestellten Längsschnittebene des Strömungskanals 24 eine sich kontinuierlich ändernde Krümmung aufweist. Die Änderung der Krümmung erfolgt hierbei stetig.The inner contour of the beam-shaping section 28 is defined by a three-dimensional free-form surface which, at least in the in FIG. 2 illustrated longitudinal section plane of the flow channel 24 has a continuously changing curvature. The change of the curvature takes place here continuously.

Wie aus dem Vergleich der Längsschnittansichten in Figur 2 und 3 deutlich wird, entspricht die Gestalt des Strahlformungsabschnitts 28 im Wesentlichen der Gestalt eines sich in Strömungsrichtung 30 kontinuierlich verengenden Schlauches, der an zwei einander diametral gegenüberliegenden Bereichen zusammengepresst wird. Durch das Zusammenpressen bildet das durch den Strömungskanal 24 hindurchströmende Fluid einen Flachstrahl aus, der sich in der senkrecht zur Hauptachse 42 ausgerichteten Ebene auffächert.As from the comparison of the longitudinal section views in FIG. 2 and 3 becomes clear, the shape of the beam-forming section 28 substantially corresponds to the shape of a continuously narrowing in the flow direction 30 hose, which is pressed together at two diametrically opposite regions. As a result of the compression, the fluid flowing through the flow channel 24 forms a flat jet, which fanned out in the plane oriented perpendicular to the main axis 42.

Aus den in Figur 3 dargestellten Strömungsquerschnitten wird unmittelbar deutlich, dass der Strömungskanal 24 einschließlich der Düsenöffnung 32 spiegelsymmetrisch zu zwei Längsschnittebenen ausgestaltet ist, die senkrecht zueinander ausgerichtet sind. Eine erste Längsschnittebene verläuft senkrecht zur Hauptachse 42 und eine zweite Längsschnittebene verläuft senkrecht zur Nebenachse 44 des ellipsenförmigen Strömungsquerschnitts des Strahlformungsabschnitts 28.From the in FIG. 3 shown flow cross sections is immediately clear that the flow channel 24 including the nozzle opening 32 is designed mirror-symmetrically to two longitudinal sectional planes perpendicular aligned with each other. A first longitudinal sectional plane runs perpendicular to the main axis 42 and a second longitudinal sectional plane runs perpendicular to the minor axis 44 of the elliptical flow cross section of the beam shaping section 28.

Die Flachstrahldüse 10 ist bevorzugt mittels eines Pulverspritzgießverfahrens hergestellt, wobei ein mit einem Binder versehenes Metall- oder Keramikpulver in einem Spritzgussverfahren verarbeitet wird. Durch Spritzgießen wird das mit dem Binder versehene Metall- oder Keramikpulver zu einem Düsenkörper geformt, der gesintert wird, nachdem zuvor der Binder entfernt wurde. Durch das Pulverspritzgießverfahren lässt sich der Düsenkörper 12 auf kostengünstige Weise mit geringen Fertigungstoleranzen herstellen.The fan jet nozzle 10 is preferably produced by means of a powder injection molding process, wherein a provided with a binder metal or ceramic powder is processed in an injection molding process. By injection molding is the formed with the binder metal or ceramic powder is formed into a nozzle body which is sintered after previously the binder has been removed. By the powder injection molding process, the nozzle body 12 can be produced in a cost-effective manner with low manufacturing tolerances.

Bei einer alternativen Herstellung wird der Düsenkörper 12 aus einem Kunststoffmaterial, vorzugsweise aus einem Duroplast geformt, wobei zur Formgebung ein Spritzgießverfahren zum Einsatz kommt.In an alternative production, the nozzle body 12 is formed from a plastic material, preferably from a duroplastic, wherein an injection molding process is used for shaping.

Die Flachstrahldüse 10 hat nicht nur den Vorteil, dass sie kostengünstig hergestellt werden kann, sondern sie zeichnet sich darüber hinaus durch sehr geringe Strömungsverluste des Fluids aus. Da die Innenkontur des Strömungskanals 24 keinerlei Stufen und Kanten aufweist, löst sich das Fluid beim Durchströmen des Strömungskanals 24 erst an einer Abrisskante 46 der Düsenöffnung 32 von der Wand des Strömungskanals 24 ab. Die Abrisskante 46 ist in einer senkrecht zur Längsachse 32 ausgerichteten Ebene 48 angeordnet. Stromabwärts der Düsenöffnung 32 wird der sich auffächernde Fluidstrahl vom Strömungskanal 24 nicht weiter beeinflusst. Die Flachstrahldüse 10 ermöglicht somit eine verlustarme Strahlformung und aufgrund ihrer leichten Formbarkeit kann sie kostengünstig in einem Spritzgießverfahren, insbesondere in einem Pulverspritzgießverfahren hergestellt werden. Sie eignet sich insbesondere für den Einsatz bei einem Hochdruckdruckreinigungsgerät. Hierbei kann sie in eine Düsenaufnahme eines Strahlrohrs des Hochdruckreinigungsgeräts eingesetzt werden. Die Bereitstellung der Quernut 40 erleichtert hierbei das Einsetzen.The flat jet nozzle 10 not only has the advantage that it can be produced inexpensively, but it is also characterized by very low flow losses of the fluid. Since the inner contour of the flow channel 24 has no steps and edges, the fluid dissolves when flowing through the flow channel 24 only at a trailing edge 46 of the nozzle opening 32 from the wall of the flow channel 24. The tear-off edge 46 is arranged in a plane 48 oriented perpendicular to the longitudinal axis 32. Downstream of the nozzle opening 32, the fanning fluid jet is not further influenced by the flow channel 24. The flat jet nozzle 10 thus enables low-loss beam shaping and, owing to its easy formability, can be produced cost-effectively in an injection molding process, in particular in a powder injection molding process. It is particularly suitable for use in a high pressure pressure washer. In this case, it can be used in a nozzle receptacle of a jet pipe of the high-pressure cleaning device. The provision of the transverse groove 40 facilitates insertion.

Claims (12)

  1. Flat-jet nozzle, in particular for a high-pressure cleaning apparatus, comprising a nozzle body (12) having extending therethrough a flow channel (24) for a fluid, wherein the flow channel (24) defines a nozzle orifice (32) and comprises, upstream of the nozzle orifice (32) in a flow direction (30) of the fluid, a jet shaping section (28) in which the flow cross-section of the flow channel (24) tapers continuously, wherein the jet shaping section (28) comprises a region in which the flow cross-section of the flow channel (24) transitions continuously from a circular shape to an elliptical shape, characterized in that the jet shaping section (28) comprises, immediately upstream of the nozzle orifice (32), an end region in which the flow cross-section of the flow channel (24) transitions continuously from an elliptical shape to a circular shape, and in that the nozzle orifice (32) is also of circular configuration.
  2. Flat-jet nozzle in accordance with claim 1, characterized in that the orientation of the main axis (42) of the elliptical flow cross-section remains unchanged along the jet shaping section (28).
  3. Flat-jet nozzle in accordance with any one of the preceding claims, characterized in that the nozzle orifice (32) has a breakaway edge (46) for the fluid which is arranged in a plane (48) oriented perpendicularly to the longitudinal direction of the flow channel (24).
  4. Flat-jet nozzle in accordance with any one of the preceding claims, characterized in that the inner contour of the jet shaping section (28) is defined by a three-dimensional freeform surface, wherein the curvature of the freeform surface changes continuously in at least one longitudinal cutting plane of the jet shaping section.
  5. Flat-jet nozzle in accordance with any one of the preceding claims, characterized in that the flow channel (24) has a mirror-symmetric configuration relative to two longitudinal cutting planes of the flow channel (24) which are oriented perpendicularly to one another.
  6. Flat-jet nozzle in accordance with any one of the preceding claims, characterized in that the nozzle orifice (32) has a mirror-symmetric configuration relative to two longitudinal cutting planes of the flow channel (24) which are oriented perpendicularly to one another.
  7. Flat-jet nozzle in accordance with any one of the preceding claims, characterized in that the flow channel (24) has an inlet section (26) which is positioned immediately upstream of the jet shaping section (28).
  8. Flat-jet nozzle in accordance with claim 7, characterized in that the inlet section (26) has a circular flow cross-section.
  9. Flat-jet nozzle in accordance with any one of the preceding claims, characterized in that the flow channel (24) has a widening section (34) which immediately adjoins the nozzle orifice (32) in the flow direction (30) of the fluid and in which the flow cross-section of the flow channel (24) widens.
  10. Flat-jet nozzle in accordance with claim 9, characterized in that the flow cross-section of the widening section (34) widens continuously, in particular conically, in the flow direction (30) of the fluid.
  11. Flat-jet nozzle in accordance with any one of the preceding claims, characterized in that flat-jet nozzle (10) is made of a metal powder or a ceramic powder.
  12. Flat-jet nozzle in accordance with any one of claims 1 to 10, characterized in that flat-jet nozzle (10) is made of a plastic material, in particular a thermosetting plastic material.
EP12809726.8A 2012-12-14 2012-12-14 Fan nozzle Active EP2931434B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/075562 WO2014090333A1 (en) 2012-12-14 2012-12-14 Fan nozzle

Publications (2)

Publication Number Publication Date
EP2931434A1 EP2931434A1 (en) 2015-10-21
EP2931434B1 true EP2931434B1 (en) 2016-11-09

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ID=47501177

Family Applications (1)

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EP12809726.8A Active EP2931434B1 (en) 2012-12-14 2012-12-14 Fan nozzle

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EP (1) EP2931434B1 (en)
CN (1) CN104781013B (en)
DK (1) DK2931434T3 (en)
ES (1) ES2614717T3 (en)
PL (1) PL2931434T3 (en)
WO (1) WO2014090333A1 (en)

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RU2723169C1 (en) * 2019-04-15 2020-06-09 Тимур Шамильевич Булушев Spray nozzle, sprayer, set of spray nozzles and method of applying fluid medium

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CN107406057A (en) * 2015-02-26 2017-11-28 阿尔弗雷德·凯驰两合公司 Vehicle wash facility
DE102015013414A1 (en) * 2015-07-22 2017-01-26 Aptar Dortmund Gmbh Nozzle arrangement and dispensing head
CN112691799A (en) * 2019-10-22 2021-04-23 天津理工大学 High-pressure fan-shaped nozzle applied to washing and sweeping vehicle
WO2021081929A1 (en) * 2019-10-31 2021-05-06 深圳市大疆创新科技有限公司 Nozzle and movable platform

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DE2927737C2 (en) 1979-07-10 1982-03-11 Lechler Gmbh & Co Kg, 7012 Fellbach Flat jet nozzle for spraying liquids
JPS60179358U (en) * 1984-05-10 1985-11-28 ヤマホ工業株式会社 Pesticide spray nozzle
DE4303762A1 (en) 1993-02-09 1994-08-11 Kaercher Gmbh & Co Alfred Flat jet nozzle for a high pressure cleaning device
DK171017B1 (en) 1993-11-25 1996-04-22 Kew Ind As Flat jet nozzle, especially for a high pressure cleaner
JP3494327B2 (en) * 1995-10-03 2004-02-09 株式会社共立合金製作所 Descaler nozzle
US5890655A (en) * 1997-01-06 1999-04-06 The Procter & Gamble Company Fan spray nozzles having elastomeric dome-shaped tips
DE19918257A1 (en) 1999-04-22 2000-11-23 Lechler Gmbh & Co Kg High pressure spray nozzle
JP2003159549A (en) * 2001-09-12 2003-06-03 Ikeuchi:Kk Spray nozzle
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DE102007024245B3 (en) * 2007-05-15 2008-08-28 Lechler Gmbh Spray nozzle i.e. high pressure nozzle for descaling steel products, has outlet clamping curved surface, and another surface abutting against boundary of outlet in radial direction at specific angle to central longitudinal axis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2723169C1 (en) * 2019-04-15 2020-06-09 Тимур Шамильевич Булушев Spray nozzle, sprayer, set of spray nozzles and method of applying fluid medium
WO2020214060A1 (en) * 2019-04-15 2020-10-22 Тимур Шамильевич Булушев Spray device and method for applying a fluid medium

Also Published As

Publication number Publication date
DK2931434T3 (en) 2017-02-13
WO2014090333A1 (en) 2014-06-19
PL2931434T3 (en) 2017-04-28
CN104781013A (en) 2015-07-15
EP2931434A1 (en) 2015-10-21
CN104781013B (en) 2017-09-12
ES2614717T3 (en) 2017-06-01

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