EP2189226A1 - Air cap with separate formed air horn and his manufacturing process with injection mould - Google Patents

Air cap with separate formed air horn and his manufacturing process with injection mould Download PDF

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Publication number
EP2189226A1
EP2189226A1 EP08020164A EP08020164A EP2189226A1 EP 2189226 A1 EP2189226 A1 EP 2189226A1 EP 08020164 A EP08020164 A EP 08020164A EP 08020164 A EP08020164 A EP 08020164A EP 2189226 A1 EP2189226 A1 EP 2189226A1
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EP
European Patent Office
Prior art keywords
air
cap
funnel
air cap
jet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08020164A
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German (de)
French (fr)
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EP2189226B1 (en
Inventor
Alfred Göhring
Peter Ibele
Hermann Probst
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J Wagner GmbH
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J Wagner GmbH
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Priority to EP08020164.3A priority Critical patent/EP2189226B1/en
Priority to US12/620,694 priority patent/US20100123024A1/en
Publication of EP2189226A1 publication Critical patent/EP2189226A1/en
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Publication of EP2189226B1 publication Critical patent/EP2189226B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • the invention relates to an air cap for the generation of an air stream with an atomized liquid according to the preamble of patent claim 1.
  • Liquids in particular paints for coating and for protecting surfaces, are applied to a surface in a known manner by means of spray guns.
  • spray guns for atomizing a paint liquid are known in a variety of different embodiments.
  • a color jet geometry For an effective homogeneous application of color to a surface, the usable range of a color jet geometry represents an important application criterion.
  • a preferred ink jet geometry for surface treatment is, for example, a flat-jet shape.
  • the housing components required for this, as well as the air- and ink-carrying components of the spray gun, such as the paint nozzle with needle valve, the crank disk and the air cap with the air funnels are usually made by injection molding, the air cap is made in one piece with the air funnels.
  • the invention has the task of avoiding the known disadvantages of the prior art and to further develop the production of an air cap with air funnels flexible and efficient.
  • the invention is characterized by the features of claim 1.
  • the invention is based on an air cap for generating an air flow with an atomized liquid, wherein the Liquid is atomized via a liquid nozzle, preferably with needle valve in the region of an air outlet opening of the air cap and the air cap comprises at least one air outlet opening, which is provided with at least one
  • downstream air funnel is in communication and forms a directed air jet.
  • the exiting, atomized liquid jet is changeable in its shape by an air jet emerging from the air funnel.
  • the essence of the invention is that the air funnel is manufactured as a separate element, in particular formed and can be connected to the air cap.
  • the air funnel is exchangeable as a separately manufactured element in a simple manner without changes to the air cap must be made.
  • the air hopper by means of a connecting means, for example a sliding guide on the surface of the air cap can be attached.
  • Such connecting elements for example dovetail guides or tongue-and-groove undercut structures, can be shaped in a simple manner, in particular by injection molding.
  • the air horn through an opening in the Air cap is inserted therethrough.
  • the connecting element can be formed on the air horn and on the air cap in a structurally simple manner, for example with a circumferential, conical collar collar which rests on the back of the air cap.
  • the connecting means of the air funnel forms a positive, preferably latching connection with the air cap.
  • a positive, preferably latching connection of the air horn with the air cap has the advantage that the air horn on the surface of the air cap can be fixed in such a way that an undesirable displacement or loss of the air horn during operation of the paint spray gun is avoided.
  • the air funnel has at least one air channel.
  • the formation of an air funnel with an air duct has the advantage that, for example, the air flow impinging on the formation of a color flat jet forms a reduced scatter, for example, as a result of which a precise alignment of the air flow on the color jet and the resulting ink jet forming is made possible.
  • the connecting means of the air funnel forms a coding.
  • an associated receptacle in the air cap can be adapted such that it has only one associated, coded on the recording connection element and thus a can record defined air funnel.
  • Injection molded element is formed, the individual mold halves are connected to each other by means of a film hinge.
  • an air funnel with individual mold halves has the advantage that the production of such an air funnel by injection molding can be substantially simplified.
  • an air passageway in the air horn is displaced from its spatial arrangement in the assembled air horn into a plane for simplified manufacture by injection molding.
  • the air duct in the air horn has a defined surface roughness.
  • the inner surface of the air channel has successive, semicircular depressions (golf ball principle) in order to improve the flow properties of the air flowing through.
  • the air duct in the air funnel is formed continuously and without edges.
  • An air flow flowing through the air duct can develop turbulences, jam or become too weak due to edges or sudden changes in direction. This is avoided by a corresponding uniform channel profile.
  • the formed by a film hinge air horn, integrally connected to a further film hinge is formed together with the air cap.
  • the arranged between the air horn and the air cap film hinge generates a captive and unmistakable overall component for a spray gun.
  • the invention is based on a method for producing an air cap, which communicates with at least one downstream air funnel and forms a directed shaped air jet.
  • At least one air horn is formed as a separate element and placed on the surface of an air cap by means of a connecting means.
  • the air funnel is produced in one piece with the air cap.
  • the air horn and / or the air cap is made by injection molding.
  • a conventional spray gun 1 for liquids which has a liquid container 2, a handle member 3 and the front end of a gun housing 4, an air cap 5 with integrally arranged air funnels 6, wherein the air cap 5 by means of a union nut 19 on the gun housing is held.
  • a paint liquid passes by actuation of a pull lever 20 from a paint nozzle 12 (in FIG. 3 shown) and is in the range of a central Recess 10 of the air cap 5 atomized by means of outflowing air, wherein the air of the spray gun 1 is supplied continuously.
  • An atomized jet of color preferably has a circular area geometry without existing air funnels 6.
  • the air cap 5 is formed on its outwardly directed surface with two air funnels 6, 6a arranged diametrically opposite one another and integrally connected to the air cap, which are each penetrated by an air channel 8.
  • a stream of air emerging from the annular gap formed from the central recess 10 and the ink nozzle 12 generates an atomized jet of color with the emerging paint, which, starting from a conical geometry, is transformed by the laterally impinging air flow coming from the air funnels 6, 6a into a nearly linear flat jet becomes.
  • FIG. 2 a known from the prior art air cap 5 is shown with a union nut 19, wherein the air cap 5 has a central recess 10, which is traversed by the supplied air.
  • the integrally formed on the surface of the air cap 5 air horns 6, 6a each have a directed onto the atomized jet of paint air duct 8.
  • a further embodiment represents, for example, the arrangement of two superimposed air ducts 8, 8a in an air funnel 6, 6a, these being brought together, for example, in a common duct in the air funnel 6, 6a or through air flowing through separate ducts.
  • a link plate 11 is shown, which has a central recess with radially outwardly directed openings 20 and partially from the paint nozzle 12 is penetrated.
  • the openings 20 cooperate, for example, with the compensation openings and form a so-called "round jet operation" of the paint spray gun 1.
  • the openings 20 are brought into juxtaposition with the air channels 8, 8a of the air horns 6, 6a, whereby the equalization openings 7 on the air cap 5 are out of operation and a so-called "flat jet operation" of the paint spray gun 1 is formed.
  • FIG. 4 an inventive air horn 6 and 6a is shown, which is formed from two mold halves, which are interconnected by means of a film hinge 15.
  • the air funnel 6, 6a In the lower region, the air funnel 6, 6a, a connecting element 16, which is formed for example as a sliding guide and in a corresponding coded recording of air passage openings 13 (in FIG. 5 shown) on the air cap 5 can be inserted.
  • this On an obliquely downward surface of the air funnel 6, 6a, this has at least one air channel 8 for forming a flat jet.
  • the air funnel 6, 6a is formed by injection molding, wherein the spatial geometry of the air ducts 6, 6a is laid as a folding part with a film hinge in two mold halves in a plane due to the formation of the air funnel according to the invention.
  • FIG. 5 an air cap 5 according to the invention is shown, wherein this comprises a central recess 10, which is flowed through by the supplied air.
  • the air cap 5 On a radially outward surface position, the air cap 5 an air passage opening 13 which for a coded recording of the air funnel 6, 6a is formed via the connecting element 16.
  • Fig. 6 shows an air cap 5 from below, which is divided on its rear side by radially outwardly molded webs 18 into individual sections.
  • the compensation openings 7 and the air passage opening 13 for the air horn 6, 6 a are arranged.
  • the air horn 6, 6a is formed in the present embodiment with a sliding guide as a connecting element 16, wherein the air horn 6, 6a and the air cap 5 are formed as separate components, which must be assembled before proper use and possibly locked.

Abstract

The cap (5) has an air outlet orifice i.e. air passage orifice (13), connected to an air director i.e. foldable injection-molded element, and generating a directed air jet. The air director is connected to the cap. The air director is attached to surface of the cap using a connection mechanism i.e. sliding guide. The air director is pushed through a central recess (10) in the cap. The connection mechanism makes positive connection i.e. latching connection, with the air cap. Individual molded halves are connected together using a film hinge. An independent claim is also included for a method for producing an air cap.

Description

Die Erfindung betrifft eine Luftkappe für die Erzeugung eines Luftstroms mit einer zerstäubten Flüssigkeit nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an air cap for the generation of an air stream with an atomized liquid according to the preamble of patent claim 1.

Stand der TechnikState of the art

Flüssigkeiten, insbesondere Farben zur Beschichtung und zum Schutz von Oberflächen, werden in bekannter Weise mittels Spritzpistolen auf eine Fläche aufgetragen. Derartige Spritzpistolen zum Zerstäuben einer Farbflüssigkeit, sind in einer Vielzahl von unterschiedlichen Ausführungsformen bekannt.Liquids, in particular paints for coating and for protecting surfaces, are applied to a surface in a known manner by means of spray guns. Such spray guns for atomizing a paint liquid are known in a variety of different embodiments.

Für ein effektives homogenes Auftragen von Farbe auf einer Fläche stellt hierbei der nutzbare Bereich einer Farbstrahlgeometrie ein wichtiges Anwendungskriterium dar. Eine bevorzugte Farbstrahlgeometrie zur Flächenbearbeitung ist beispielsweise eine Flachstrahlform.For an effective homogeneous application of color to a surface, the usable range of a color jet geometry represents an important application criterion. A preferred ink jet geometry for surface treatment is, for example, a flat-jet shape.

In der Druckschrift EP 1 880 771 A1 wird eine Spritzpistole zum Versprühen von Farben gezeigt, wobei eine Überwurfmutter eine Luftkappe mit zwei diametral einander gegenüberliegend angeordneten Luftrichtern (Lufthörner) vor einer Kulissenscheibe anordnet. In den Luftrichtern sind Luftkanäle eingearbeitet, die einen Luftstrom seitlich auf einen austretenden Farbstrahl der Spritzpistole richten, wodurch die Geometrie der Farbstrahlform verändert wird.In the publication EP 1 880 771 A1 a spray gun for spraying paints is shown, wherein a union nut an air cap with two diametrically oppositely arranged Luftrichtern (air horns) in front of a link disc arranges. In the air funnels air channels are incorporated, which direct an air flow laterally on an emerging color jet of the spray gun, whereby the Geometry of the color beam shape is changed.

Die hierzu erforderlichen Gehäusebauteile, sowie die luft- und farbführenden Bauteile der Spritzpistole, wie beispielsweise die Farbdüse mit Nadelventil, die Kulissenscheibe bzw. die Luftkappe mit den Luftrichtern werden üblicherweise im Spritzgussverfahren hergestellt, wobei die Luftkappe mit den Luftrichtern werkstoffeinstückig hergestellt ist.The housing components required for this, as well as the air- and ink-carrying components of the spray gun, such as the paint nozzle with needle valve, the crank disk and the air cap with the air funnels are usually made by injection molding, the air cap is made in one piece with the air funnels.

Zur werkstoffeinstückigen Herstellung einer Luftkappe mit Luftrichtern sind aufwendige und kostenintensive Spritzgussformen erforderlich, um die meist hohen Anforderungen an die Formgeometrie bzw. Oberflächenbeschaffenheit derartiger Bauteile zu erfüllen.For material integral production of an air cap with air funnels complex and costly injection molds are required to meet the usually high demands on the shape geometry or surface finish of such components.

Darüber hinaus ist die Gestaltungsfreiheit, speziell im Bereich der Luftkanalführung in den Lufthörnern eingeschränkt, da zur werkstoffeinstückigen Herstellung von Spritzgussteilen mit einer aufwendigen Luftkanalführung eine ebenso aufwendig ausgebildete Spritzgussform erforderlich ist oder sogar weitere Bearbeitungsschritte wie beispielsweise Bohrvorgänge notwendig sind.In addition, the freedom of design, especially in the field of air duct guidance in the air horns limited because the material einstückigen production of injection molded parts with a complex air duct guide an equally elaborate injection mold is required or even further processing steps such as drilling operations are necessary.

Aus diesem Grunde hat sich die Erfindung die Aufgabe gestellt, die bekannten Nachteile zum Stand der Technik zu vermeiden und die Herstellung einer Luftkappe mit Luftrichtern flexibel und effizient weiterzubilden.For this reason, the invention has the task of avoiding the known disadvantages of the prior art and to further develop the production of an air cap with air funnels flexible and efficient.

Zur Lösung der Aufgabe ist die Erfindung durch die Merkmale des Patentanspruchs 1 gekennzeichnet.To solve the problem, the invention is characterized by the features of claim 1.

Offenbarung der ErfindungDisclosure of the invention

Die Erfindung geht von einer Luftkappe für die Erzeugung eines Luftstroms mit einer zerstäubten Flüssigkeit aus, wobei die Flüssigkeit über eine Flüssigkeitsdüse, vorzugsweise mit Nadelventil im Bereich einer Luftaustrittsöffnung der Luftkappe zerstäubt wird und die Luftkappe mindestens eine Luftaustrittsöffnung umfasst, die mit mindestens einemThe invention is based on an air cap for generating an air flow with an atomized liquid, wherein the Liquid is atomized via a liquid nozzle, preferably with needle valve in the region of an air outlet opening of the air cap and the air cap comprises at least one air outlet opening, which is provided with at least one

nachgeschalteten Luftrichter in Verbindung steht und einen gerichteten Luftstrahl ausbildet.downstream air funnel is in communication and forms a directed air jet.

Der austretende, zerstäubte Flüssigkeitsstrahl ist durch einen aus dem Luftrichter austretenden Luftstrahl in seiner Form veränderbar.The exiting, atomized liquid jet is changeable in its shape by an air jet emerging from the air funnel.

Der Kern der Erfindung liegt darin, dass der Luftrichter als separates Element hergestellt, insbesondere ausgeformt ist und mit der Luftkappe verbindbar ist.The essence of the invention is that the air funnel is manufactured as a separate element, in particular formed and can be connected to the air cap.

Dies hat den Vorteil, dass eine zur Ausformung eines separaten Luftrichters erforderliche Spritzgussform eine einfachere Geometrie aufweisen kann, insbesondere für im Bauteil liegende Raumgeometrien, wie beispielsweise ein Luftkanal.This has the advantage that an injection mold required for forming a separate air funnel can have a simpler geometry, in particular for spatial geometries lying in the component, such as, for example, an air duct.

Zusätzlich ist es von Vorteil, dass der Luftrichter als separat hergestelltes Element in einfacher Art und Weise austauschbar ist, ohne dass Veränderungen an der Luftkappe vorgenommen werden müssen.In addition, it is advantageous that the air funnel is exchangeable as a separately manufactured element in a simple manner without changes to the air cap must be made.

In einer bevorzugten Ausführungsform der Erfindung ist vorgesehen, dass der Luftrichter mittels einem Verbindungsmittel, beispielsweise einer Schiebeführung auf der Oberfläche der Luftkappe anbringbar ist.In a preferred embodiment of the invention it is provided that the air hopper by means of a connecting means, for example a sliding guide on the surface of the air cap can be attached.

Derartige Verbindungselemente, beispielsweise Schwalbenschwanzführungen oder Nut-Feder Hintergreifstrukturen lassen sich insbesondere im Spritzgussverfahren einfach ausformen.Such connecting elements, for example dovetail guides or tongue-and-groove undercut structures, can be shaped in a simple manner, in particular by injection molding.

In einer überdies bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass der Luftrichter durch eine Öffnung in der Luftkappe hindurch einschiebbar ist.In a further preferred embodiment of the invention it is provided that the air horn through an opening in the Air cap is inserted therethrough.

Dies hat den Vorteil, dass das Verbindungselement am Luftrichter und an der Luftkappe in einer konstruktiv einfachen Art und Weise ausgebildet werden kann, beispielsweise mit einem umlaufenden, konischen Kragenbund, der auf der Rückseite der Luftkappe anliegt. Darüber hinaus ist in einer weiteren Ausgestaltung der Erfindung vorgesehen, dass das Verbindungsmittel des Luftrichters eine formschlüssige, vorzugsweise rastende Verbindung mit der Luftkappe ausbildet.This has the advantage that the connecting element can be formed on the air horn and on the air cap in a structurally simple manner, for example with a circumferential, conical collar collar which rests on the back of the air cap. In addition, it is provided in a further embodiment of the invention that the connecting means of the air funnel forms a positive, preferably latching connection with the air cap.

Eine formschlüssige, vorzugsweise rastende Verbindung des Luftrichters mit der Luftkappe hat den Vorteil, dass der Luftrichter auf der Oberfläche der Luftkappe derart fixierbar ist, dass eine unerwünschte Verschiebung oder ein Verlust des Luftrichters im Betrieb der Farbspritzpistole vermieden wird.A positive, preferably latching connection of the air horn with the air cap has the advantage that the air horn on the surface of the air cap can be fixed in such a way that an undesirable displacement or loss of the air horn during operation of the paint spray gun is avoided.

Überdies ist in einer weiteren Ausgestaltung der Erfindung vorgesehen, dass der Luftrichter wenigstens einen Luftkanal aufweist.Moreover, in a further embodiment of the invention, it is provided that the air funnel has at least one air channel.

Die Ausformung eines Luftrichters mit einem Luftkanal hat den Vorteil, dass beispielsweise der zur Formung eines Farbflachstrahls auftreffende Luftstrom beispielsweise im Vergleich zu einer Ablenkplatte eine verminderte Streuung ausbildet, wodurch eine präzise Ausrichtung des Luftstroms auf den Farbstrahl und die daraus resultierende Farbstrahlformung ermöglicht wird.The formation of an air funnel with an air duct has the advantage that, for example, the air flow impinging on the formation of a color flat jet forms a reduced scatter, for example, as a result of which a precise alignment of the air flow on the color jet and the resulting ink jet forming is made possible.

Weiterhin ist in einer bevorzugten Ausgestaltung der Erfindung vorgesehen, dass das Verbindungsmittel des Luftrichters eine Kodierung ausbildet.Furthermore, it is provided in a preferred embodiment of the invention that the connecting means of the air funnel forms a coding.

Je nach Ausbildung des Verbindungsmittels mit Bezug auf die Form, kann eine zugehörige Aufnahme in der Luftkappe derart angepasst sein, dass diese ausschließlich ein zugehöriges, auf die Aufnahme kodiertes Verbindungselement und somit einen definierten Luftrichter aufnehmen kann.Depending on the design of the connection means with respect to the form, an associated receptacle in the air cap can be adapted such that it has only one associated, coded on the recording connection element and thus a can record defined air funnel.

Dadurch wird ein unerwünschtes Verwechseln von unterschiedlich ausgebildeten Luftrichtern auf einer Luftkappe, beispielsweise bei der Anbringung durch den Endverbraucher, vermieden.As a result, an undesirable confusion of differently shaped air funnels on an air cap, for example when attached by the end user, is avoided.

In einer weiteren bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass der Luftrichter als faltbaresIn a further preferred embodiment of the invention it is provided that the air horn as foldable

Spritzgusselement ausgebildet ist, dessen einzelne Formhälften mittels einem Filmscharnier miteinander verbunden sind.Injection molded element is formed, the individual mold halves are connected to each other by means of a film hinge.

Die Ausformung eines Luftrichters mit einzelnen Formhälften hat den Vorteil, dass die spritzgusstechnische Herstellung eines derartigen Luftrichters wesentlich vereinfacht werden kann. Beispielsweise wird ein Luftkanalverlauf im Luftrichter von seiner räumlichen Anordnung in dem zusammengefügten Luftrichter für ein vereinfachtes Herstellen im Spritzgussverfahren in eine Ebene verlegt.The formation of an air funnel with individual mold halves has the advantage that the production of such an air funnel by injection molding can be substantially simplified. For example, an air passageway in the air horn is displaced from its spatial arrangement in the assembled air horn into a plane for simplified manufacture by injection molding.

In einer überdies bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass der Luftkanal im Luftrichter eine definierte Oberflächenrauhigkeit aufweist.In a further preferred embodiment of the invention it is provided that the air duct in the air horn has a defined surface roughness.

So ist es beispielsweise vorteilhaft, wenn die innere Oberfläche des Luftkanals aufeinanderfolgende, halbrunde Vertiefungen aufweist (Prinzip Golfball), um die Fließeigenschaften der hindurchströmenden Luft zu verbessern.Thus, for example, it is advantageous if the inner surface of the air channel has successive, semicircular depressions (golf ball principle) in order to improve the flow properties of the air flowing through.

Überdies ist in einer weiteren Ausgestaltung der Erfindung vorgesehen, dass der Luftkanal im Luftrichter stetig und kantenfrei gebildet ist.Moreover, in a further embodiment of the invention, it is provided that the air duct in the air funnel is formed continuously and without edges.

Ein durch den Luftkanal fließender Luftstrom kann durch Kanten oder plötzlichen Richtungsänderungen Turbulenzen entwickeln, gestaut bzw. zu schwach ausgebildet werden. Dies wird durch einen entsprechenden gleichmäßigen Kanalverlauf vermieden. Darüber hinaus ist es denkbar, dass der mittels einem Filmscharnier ausgebildete Luftrichter, einstückig mit einem weiterem Filmscharnier verbunden zusammen mit der Luftkappe ausformbar ist.An air flow flowing through the air duct can develop turbulences, jam or become too weak due to edges or sudden changes in direction. This is avoided by a corresponding uniform channel profile. Moreover, it is conceivable that the formed by a film hinge air horn, integrally connected to a further film hinge is formed together with the air cap.

Dies hat den Vorteil, dass die Herstellkosten zur Ausformung von zwei miteinander verbundenen Bauteilen gesenkt werden können, da lediglich eine einzige Spritzgussform für das komplette Element (Luftkappe und Luftrichter) einzusetzen ist.This has the advantage that the manufacturing costs for forming two interconnected components can be reduced, since only a single injection mold for the complete element (air cap and air horn) is to be used.

Darüber hinaus erzeugt das zwischen dem Luftrichter und der Luftkappe angeordnete Filmscharnier ein verliersicheres und verwechslungssicheres Gesamtbauteil für eine Spritzpistole aus.In addition, the arranged between the air horn and the air cap film hinge generates a captive and unmistakable overall component for a spray gun.

Zusätzlich geht die Erfindung von einem Verfahren zur Herstellung einer Luftkappe aus, welche mit mindestens einem nachgeschalteten Luftrichter in Verbindung steht und einen gerichteten geformten Luftstrahl ausbildet.In addition, the invention is based on a method for producing an air cap, which communicates with at least one downstream air funnel and forms a directed shaped air jet.

Kern dieses Verfahrens ist, dass mindestens ein Luftrichter als separates Element ausgeformt und auf der Oberfläche einer Luftkappe mittels eines Verbindungsmittels angeordnet wird.The essence of this method is that at least one air horn is formed as a separate element and placed on the surface of an air cap by means of a connecting means.

In einer weiteren, bevorzugten Ausgestaltung des Verfahrens ist vorgesehen, dass der Luftrichter einstückig mit der Luftkappe hergestellt wird.In a further, preferred embodiment of the method, it is provided that the air funnel is produced in one piece with the air cap.

Darüber hinaus ist es in einer weiteren bevorzugten Ausgestaltung des Verfahrens vorgesehen, dass der Luftrichter und/oder die Luftkappe im Spritzgussverfahren hergestellt ist.Moreover, it is provided in a further preferred embodiment of the method that the air horn and / or the air cap is made by injection molding.

Die Ausformung eines Luftrichters und/oder einer Luftkappe im Spritzgussverfahren hat den Vorteil, das derartige Elemente mit einer komplexen Formgebung in einem einzigen Arbeitsschritt effizient herstellbar sind.The formation of an air horn and / or an air cap by injection molding has the advantage that such elements can be produced efficiently with a complex shape in a single step.

Weitere Merkmale der Erfindung gehen aus der nachfolgenden Figurenbeschreibung und den Zeichnung hervor.Further features of the invention will become apparent from the following Description of the figures and the drawing.

Dabei zeigen:

Fig. 1
eine aus dem Stand der Technik bekannte Spritzpistole für Flüssigkeiten;
Fig. 2
eine zum Stand der Technik bekannte Luftkappe mit einstückig angeformten Luftrichtern und Überwurfmutter;
Fig. 3
eine zum Stand der Technik bekannte Kulissenscheibe zur Luftverteilung für eine Luftkappe;
Fig. 4
einen aus zwei Formhälften ausgeformten Luftrichter;
Fig. 5
eine Teilansicht einer Luftkappe mit kodierter Aufnahme für einen Luftrichter;
Fig. 6
eine Luftkappe in der Ansicht von unten.
Showing:
Fig. 1
a known from the prior art spray gun for liquids;
Fig. 2
an air cap known in the art with integrally molded air funnels and union nut;
Fig. 3
a known prior art link plate for air distribution for an air cap;
Fig. 4
a formed from two mold halves air horn;
Fig. 5
a partial view of an air cap with coded recording for a Luftrichter;
Fig. 6
an air cap in the bottom view.

In Fig. 1 wird eine herkömmliche Spritzpistole 1 für Flüssigkeiten, vorzugsweise für Farben gezeigt, welche einen Flüssigkeitsbehälter 2, ein Handgriffelement 3 und am vorderen Ende eines Pistolengehäuses 4 eine Luftkappe 5 mit darauf einstückig angeordneten Luftrichtern 6 aufweist, wobei die Luftkappe 5 mittels einer Überwurfmutter 19 am Pistolengehäuse 4 gehalten ist.In Fig. 1 a conventional spray gun 1 for liquids, preferably shown for colors, which has a liquid container 2, a handle member 3 and the front end of a gun housing 4, an air cap 5 with integrally arranged air funnels 6, wherein the air cap 5 by means of a union nut 19 on the gun housing is held.

Im Betrieb der Spritzpistole 1 tritt eine Farbflüssigkeit durch Betätigung eines Zughebels 20 aus einer Farbdüse 12 (in Figur 3 dargestellt) aus und wird im Bereich einer zentralen Ausnehmung 10 der Luftkappe 5 mittels ausströmender Luft zerstäubt, wobei Die Luft der Spritzpistole 1 kontinuierlich zugeführt wird.In operation of the spray gun 1, a paint liquid passes by actuation of a pull lever 20 from a paint nozzle 12 (in FIG. 3 shown) and is in the range of a central Recess 10 of the air cap 5 atomized by means of outflowing air, wherein the air of the spray gun 1 is supplied continuously.

Ein zerstäubter Farbstrahl weist ohne vorhandene Luftrichter 6 vorzugsweise eine kreisförmige Flächengeometrie auf.An atomized jet of color preferably has a circular area geometry without existing air funnels 6.

Die Luftkappe 5 ist auf ihrer nach außen gerichteten Oberfläche mit zwei diametral einander gegenüber angeordneten, mit der Luftkappe einstückig verbundenen Luftrichtern 6, 6a ausgebildet, die jeweils von einem Luftkanal 8 durchsetzt sind.The air cap 5 is formed on its outwardly directed surface with two air funnels 6, 6a arranged diametrically opposite one another and integrally connected to the air cap, which are each penetrated by an air channel 8.

Ein aus dem aus der zentralen Ausnehmung 10 und der Farbdüse 12 gebildeten Ringspalt austretender Luftstrom erzeugt mit der austretenden Farbe einen zerstäubten Farbstrahl, wobei dieser ausgehend von einer kegelförmigen Raumgeometrie durch die aus den Luftrichter 6, 6a kommende seitlich auftreffende Luftströmung in einen nahezu linienförmigen Flachstrahl umgeformt wird.A stream of air emerging from the annular gap formed from the central recess 10 and the ink nozzle 12 generates an atomized jet of color with the emerging paint, which, starting from a conical geometry, is transformed by the laterally impinging air flow coming from the air funnels 6, 6a into a nearly linear flat jet becomes.

In Fig. 2 ist eine aus dem Stand der Technik bekannte Luftkappe 5 mit einer Überwurfmutter 19 gezeigt, wobei die Luftkappe 5 eine zentrale Ausnehmung 10 aufweist, welche von der zugeführten Luft durchströmt ist.In Fig. 2 a known from the prior art air cap 5 is shown with a union nut 19, wherein the air cap 5 has a central recess 10, which is traversed by the supplied air.

Die auf der Oberfläche der Luftkappe 5 einstückig angeformten Luftrichter 6, 6a weisen jeweils einen auf den zerstäubten Farbstrahl gerichteten Luftkanal 8 auf.The integrally formed on the surface of the air cap 5 air horns 6, 6a each have a directed onto the atomized jet of paint air duct 8.

Eine weitere Ausführungsform stellt beispielsweise die Anordnung von zwei übereinander liegenden Luftkanälen 8,8a in einem Luftrichter 6, 6a dar, wobei diese beispielsweise in einem gemeinsamen Kanal im Luftrichter 6, 6a zusammengeführt sind oder in getrennten Kanälen von Luft durchströmt werden.
In Fig. 3 ist eine Kulissenscheibe 11 gezeigt, die eine zentrale Ausnehmung mit radial nach außen gerichteten Öffnungen 20 aufweist und von der Farbdüse 12 teilweise durchgriffen ist.A further embodiment represents, for example, the arrangement of two superimposed air ducts 8, 8a in an air funnel 6, 6a, these being brought together, for example, in a common duct in the air funnel 6, 6a or through air flowing through separate ducts.
In Fig. 3 a link plate 11 is shown, which has a central recess with radially outwardly directed openings 20 and partially from the paint nozzle 12 is penetrated.

Die Öffnungen 20 wirken beispielsweise mit den Ausgleichsöffnungen zusammen und bilden einen so genannten "Rundstrahlbetrieb" der Farbspritzpistole 1 aus.
Durch Verdrehen der Luftkappe 5 werden die Öffnungen 20 in Gegenüberstellung mit den Luftkanälen 8, 8a der Luftrichter 6, 6a gebracht, wodurch die Ausgleichsöffnungen 7 auf der Luftkappe 5 außer Betrieb sind und ein so genannter "Flachstrahlbetrieb" der Farbspritzpistole 1 ausgebildet ist.The openings 20 cooperate, for example, with the compensation openings and form a so-called "round jet operation" of the paint spray gun 1.
By rotating the air cap 5, the openings 20 are brought into juxtaposition with the air channels 8, 8a of the air horns 6, 6a, whereby the equalization openings 7 on the air cap 5 are out of operation and a so-called "flat jet operation" of the paint spray gun 1 is formed.

In Fig. 4 ist ein erfindungsgemäßer Luftrichter 6 bzw. 6a gezeigt, welcher aus zwei Formhälften gebildet ist, die mittels einem Filmscharnier 15 miteinander verbunden sind.In Fig. 4 an inventive air horn 6 and 6a is shown, which is formed from two mold halves, which are interconnected by means of a film hinge 15.

Im unteren Bereich weist der Luftrichter 6, 6a ein Verbindungselement 16 auf, welches beispielsweise als Schiebeführung ausgebildet ist und in eine entsprechend codierte Aufnahme von Luftdurchtrittsöffnungen 13 (in Figur 5 dargestellt) auf der Luftkappe 5 einschiebbar ist.In the lower region, the air funnel 6, 6a, a connecting element 16, which is formed for example as a sliding guide and in a corresponding coded recording of air passage openings 13 (in FIG. 5 shown) on the air cap 5 can be inserted.

Auf einer schräg nach unten gerichteten Oberfläche des Luftrichters 6, 6a weist dieser mindestens einen Luftkanal 8 zur Ausformung eines Flachstrahls auf.On an obliquely downward surface of the air funnel 6, 6a, this has at least one air channel 8 for forming a flat jet.

Der Luftrichter 6, 6a wird im Spritzgussverfahren ausgeformt, wobei die räumliche Geometrie der Luftkanäle 6, 6a aufgrund der Ausformung des erfindungsgemäßen Luftrichters als Faltteil mit einem Filmscharnier in zwei Formhälften in eine Ebene verlegt ist.The air funnel 6, 6a is formed by injection molding, wherein the spatial geometry of the air ducts 6, 6a is laid as a folding part with a film hinge in two mold halves in a plane due to the formation of the air funnel according to the invention.

In Fig. 5 ist eine erfindungsgemäße Luftkappe 5 gezeigt, wobei diese eine zentrale Ausnehmung 10 umfasst, die von der zugeführten Luft durchströmt ist.In Fig. 5 an air cap 5 according to the invention is shown, wherein this comprises a central recess 10, which is flowed through by the supplied air.

Auf einer radial nach außen liegenden Oberflächenposition weist die Luftkappe 5 eine Luftdurchtrittsöffnung 13 auf, die für eine codierte Aufnahme des Luftrichters 6, 6a über das Verbindungselement 16 ausgebildet ist.On a radially outward surface position, the air cap 5 an air passage opening 13 which for a coded recording of the air funnel 6, 6a is formed via the connecting element 16.

Fig. 6 zeigt eine Luftkappe 5 von unten, wobei diese auf ihrer Rückseite durch radial nach außen angeformte Stege 18 in einzelne Abschnitte unterteilt ist. Fig. 6 shows an air cap 5 from below, which is divided on its rear side by radially outwardly molded webs 18 into individual sections.

In den Abschnitten sind die Ausgleichsöffnungen 7 und die Luftdurchtrittsöffnung 13 für die Luftrichter 6, 6a angeordnet.In the sections, the compensation openings 7 and the air passage opening 13 for the air horn 6, 6 a are arranged.

Der Luftrichter 6, 6a ist in der vorliegenden Ausführungsform mit einer Schiebeführung als Verbindungselement 16 ausgebildet, wobei der Luftrichter 6, 6a und die Luftkappe 5 als getrennte Bauteile ausgeformt sind, welche vor der ordnungsgemäßen Benutzung zusammengesetzt und gegebenenfalls verrastet werden müssen.The air horn 6, 6a is formed in the present embodiment with a sliding guide as a connecting element 16, wherein the air horn 6, 6a and the air cap 5 are formed as separate components, which must be assembled before proper use and possibly locked.

Dabei ist eine getrennte Anordnung von beispielsweise einer Luftrichterausformung und einer Luftkappenausformung innerhalb einer Spritzgussform zur Senkung der Herstellkosten ausführbar.In this case, a separate arrangement of, for example, a Luftrichterausformung and a Luftkappenausformung within an injection mold to reduce the manufacturing cost executable.

Der Erfindungsgegenstand der vorliegenden Erfindung ergibt sich nicht nur aus dem Gegenstand der einzelnen Patentansprüche, sondern auch aus der Kombination der einzelnen Patentansprüche untereinander.The subject of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.

Alle in den Unterlagen, einschließlich der Zusammenfassung offenbarten Angaben und Merkmale, insbesondere die in den Zeichnungen dargestellte räumliche Ausbildung, werden als erfindungswesentlich beansprucht, soweit sie einzeln oder in Kombination gegenüber dem Stand der Technik neu sind.All information and features disclosed in the documents, including the abstract, in particular the spatial design shown in the drawings, are claimed to be essential to the invention insofar as they are novel individually or in combination with respect to the prior art.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
FarbspritzpistoleSpray Gun
22
Farbbehälterpaint container
33
HandgriffelementHandle element
44
Pistolengehäusegun housing
55
Luftkappeair cap
66
Luftrichterair director
6a6a
Luftrichterair director
77
Ausgleichsöffnung (Luft)Compensation opening (air)
8,8a8,8a
Luftkanalair duct
1010
Zentrale AusnehmungCentral recess
1111
Kulissenscheibelink disk
12.12th
Farbdüse (Flüssigkeitsdüse)Paint nozzle (liquid nozzle)
1313
LuftdurchtrittsöffnungAir passage opening
1414
Verbindungsstegconnecting web
1515
Filmscharnierfilm hinge
1616
Verbindungselementconnecting element
1919
ÜberwurfmutterNut
2020
Zughebelpull lever

Claims (14)

Luftkappe (5) für die Erzeugung eines Luftstroms mit einer zerstäubten Flüssigkeit, wobei die Flüssigkeit über eine Flüssigkeitsdüse (12), vorzugsweise mit Nadelventil im Bereich einer Luftaustrittsöffnung der Luftkappe (5) zerstäubt wird und die Luftkappe (5) mindestens eine weitere Luftaustrittsöffnung umfasst, die mit mindestens einem nachgeschalteten Luftrichter (6, 6a) in Verbindung steht und einen gerichteten Luftstrahl ausbildet, dadurch gekennzeichnet, dass der Luftrichter (6, 6a) als separates Element hergestellt, insbesondere ausgeformt ist und mit der Luftkappe (5) verbindbar ist.Air cap (5) for generating an air flow with an atomized liquid, wherein the liquid via a liquid nozzle (12), preferably with needle valve in the region of an air outlet opening of the air cap (5) is atomized and the air cap (5) comprises at least one further air outlet opening, which is connected to at least one downstream air funnel (6, 6a) and forms a directed air jet, characterized in that the air funnel (6, 6a) is made as a separate element, in particular formed and with the air cap (5) is connectable. Luftkappe (5) nach Anspruch 1, dadurch gekennzeichnet, dass der Luftrichter (6, 6a) mittels einem Verbindungsmittel (16), beispielsweise einer Schiebeführung auf der Oberfläche der Luftkappe (5) anbringbar ist.Air cap (5) according to claim 1, characterized in that the air funnel (6, 6a) by means of a connecting means (16), for example a sliding guide on the surface of the air cap (5) is attachable. Luftkappe (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Luftrichter (6, 6a) durch eine Ausnehmung in der Luftkappe (5) hindurch einschiebbar ist.Air cap (5) according to one of the preceding claims, characterized in that the air funnel (6, 6a) can be inserted through a recess in the air cap (5). Luftkappe (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Verbindungsmittel (16) des Luftrichters (6, 6a) eine formschlüssige, vorzugsweise rastende Verbindung mit der Luftkappe (5) ausbildet.Air cap (5) according to one of the preceding claims, characterized in that the connecting means (16) of the air funnel (6, 6a) forms a positive, preferably latching connection with the air cap (5). Luftkappe (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Luftrichter (6, 6a) wenigstens einen Luftkanal (8) aufweist.Air cap (5) according to one of the preceding claims, characterized in that the air funnel (6, 6a) has at least one air channel (8). Luftkappe (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Verbindungsmittel (16) des Luftrichters (6, 6a) eine Codierung ausbildet.Air cap (5) according to one of the preceding claims, characterized in that the connecting means (16) of the air funnel (6, 6a) forms an encoding. Luftkappe (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Luftrichter (6, 6a) als faltbares Spritzgusselement ausgebildet ist, dessen einzelnen Formhälften mittels einem Filmscharnier (15) miteinander verbunden sind.Air cap (5) according to one of the preceding claims, characterized in that the air funnel (6, 6a) is designed as a foldable injection-molded element whose individual mold halves are connected to each other by means of a film hinge (15). Luftkappe (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Luftkanal (8) im Luftrichter (6, 6a) eine definierte Oberflächenrauhigkeit aufweist.Air cap (5) according to one of the preceding claims, characterized in that the air channel (8) in the air funnel (6, 6a) has a defined surface roughness. Luftkappe (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Luftkanal (8) im Luftrichter (6, 6a) stetig und kantenfrei gebildet ist.Air cap (5) according to one of the preceding claims, characterized in that the air channel (8) in the air funnel (6, 6a) is formed continuously and without edges. Luftkappe (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Luftrichter (6) auf der Oberfläche der Luftkappe (5) symmetrisch zu einem weiteren Luftrichter (6a) anbringbar ist, wobei die Luftaustrittsöffnung des Luftkanals (8) auf den zerstäubten Flüssigkeitsstrahl gerichtet ist.Air cap (5) according to one of the preceding claims, characterized in that the air funnel (6) on the surface of the air cap (5) symmetrically to another air horn (6a) is attachable, wherein the air outlet opening of the air duct (8) on the atomized liquid jet is directed. Luftkappe (5) für die Erzeugung eines Luftstroms mit einer zerstäubten Flüssigkeit, wobei die Flüssigkeit über eine Flüssigkeitsdüse (12), vorzugsweise mit Nadelventil im Bereich einer Luftaustrittsöffnung der Luftkappe (5) zerstäubt wird und die Luftkappe (5) mindestens eine weitere Luftaustrittsöffnung umfasst, die mit mindestens einem nachgeschalteten Luftrichter (6, 6a) in Verbindung steht und einen gerichteten Luftstrahl ausbildet, dadurch gekennzeichnet, dass der mittels einem Filmscharnier (15) ausgebildete Luftrichter (6, 6a) einstückig mit einem weiteren Filmscharnier zusammen mit der Luftkappe (5) hergestellt ist.Air cap (5) for generating an air flow with an atomized liquid, wherein the liquid via a liquid nozzle (12), preferably with needle valve in the region of an air outlet opening of the air cap (5) is atomized and the air cap (5) comprises at least one further air outlet opening, which is connected to at least one downstream air funnel (6, 6a) and forms a directed air jet, characterized in that the means of a film hinge (15) formed air funnels (6, 6a) is made in one piece with another film hinge together with the air cap (5). Verfahren zur Herstellung einer Luftkappe (5) mit daran angeordneten Luftrichtern (6, 6a) nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass mindestens ein Luftrichter (6, 6a) als separates Element ausgeformt und auf der Oberfläche einer Luftkappe (5) mittels einem Verbindungselement (16) angeordnet ist.Method for producing an air cap (5) with air funnels (6, 6a) arranged thereon according to one of claims 1 to 11, characterized in that at least one air funnel (6, 6a) is formed as a separate element and mounted on the surface of an air cap (5). is arranged by means of a connecting element (16). Verfahren nach Anspruch 12, dadurch gekennzeichnet, dass der Luftrichter (6, 6a) einstückig mit der Luftkappe (5) hergestellt wird.A method according to claim 12, characterized in that the air funnel (6, 6a) is made in one piece with the air cap (5). Verfahren nach einem der vorhergehenden Ansprüche 12 und 13, dadurch gekennzeichnet, dass der Luftrichter (6, 6a) und/oder die Luftkappe (5) im Spritzgussverfahren hergestellt ist.Method according to one of the preceding claims 12 and 13, characterized in that the air funnel (6, 6a) and / or the air cap (5) is produced by injection molding.
EP08020164.3A 2008-11-19 2008-11-19 Air cap with separate formed air horn and his manufacturing process with injection mould Active EP2189226B1 (en)

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EP08020164.3A EP2189226B1 (en) 2008-11-19 2008-11-19 Air cap with separate formed air horn and his manufacturing process with injection mould
US12/620,694 US20100123024A1 (en) 2008-11-19 2009-11-18 Air cap with air director

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CN103370139B (en) 2011-02-09 2017-09-05 3M创新有限公司 Nozzle head and nozzle component for liquid spray gun
BR112014001936A2 (en) 2011-07-28 2017-02-21 3M Innovative Properties Co sprinkler head assembly with integrated nozzle / air cap for a liquid spray gun
AU2012323301B2 (en) 2011-10-12 2016-03-24 3M Innovative Properties Company Spray head assemblies for liquid spray guns
RU2608490C9 (en) 2012-03-06 2017-06-14 3М Инновейтив Пропертиз Компани Sprayer with built-in pressure channel
EP2828000B1 (en) 2012-03-23 2019-08-21 3M Innovative Properties Company Spray gun barrel with inseparable nozzle
RU2638399C2 (en) 2013-07-15 2017-12-13 3М Инновейтив Пропертиз Компани Pneumatic caps with shaped inserts for liquid spray guns
CA2951646C (en) 2014-06-10 2022-08-16 3M Innovative Properties Company Nozzle assembly with external baffles
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