EP1384514B1 - Rotary sprayer and bearing for this sprayer - Google Patents

Rotary sprayer and bearing for this sprayer Download PDF

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Publication number
EP1384514B1
EP1384514B1 EP03016335A EP03016335A EP1384514B1 EP 1384514 B1 EP1384514 B1 EP 1384514B1 EP 03016335 A EP03016335 A EP 03016335A EP 03016335 A EP03016335 A EP 03016335A EP 1384514 B1 EP1384514 B1 EP 1384514B1
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EP
European Patent Office
Prior art keywords
shaping air
turbine
bell cup
outer diameter
air line
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.)
Expired - Lifetime
Application number
EP03016335A
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German (de)
French (fr)
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EP1384514A2 (en
EP1384514A3 (en
Inventor
Hans-Jürgen Dr. Nolte
Harry Krumma
Frank Herre
Michael Baumann
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Duerr Systems AG
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Duerr Systems AG
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Publication date
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Priority to SI200331712T priority Critical patent/SI1384514T1/en
Publication of EP1384514A2 publication Critical patent/EP1384514A2/en
Publication of EP1384514A3 publication Critical patent/EP1384514A3/en
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Publication of EP1384514B1 publication Critical patent/EP1384514B1/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
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1035—Driving means; Parts thereof, e.g. turbine, shaft, bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1092—Means for supplying shaping gas

Definitions

  • the invention relates to a rotary atomizer for coating workpieces according to the preamble of claim 1 and a bearing unit according to claim 12.
  • rotary atomizers In painting plants, rotary atomizers are known to be used, in which a so-called bell plate is driven by a compressed air turbine at high speeds.
  • the bell cup is hereby generally frusto-conical and expands in spray direction, wherein the coating agent to be applied is accelerated axially and in particular radially in the frusto-conical bell cup due to the centrifugal forces, so that a cone-shaped spray jet is formed on the Bell plate tearing edge.
  • the shaping air is supplied through a shaping air duct, which extends outside the housing of the rotary atomizer outside between the housing wall and the compressed-air turbine.
  • a shaping air duct which extends outside the housing of the rotary atomizer outside between the housing wall and the compressed-air turbine.
  • a disadvantage of the known arrangement of the Lenkluft ist is further that the steering air duct must first be redirected from the terminal in the assembly-side end face outward to then be passed to the outside of the compressed air turbine can.
  • this guidance of the steering air duct is poor in terms of flow dynamics, since the flow resistance is increased by the changes in direction of the steering air and, moreover, undesired resonance effects which worsen the painting result can also occur within the steering air duct.
  • Such a rotary atomizer is also off EP 0 878 238 A1 known.
  • the steering air duct in the rotary atomizer is also guided around the outside of the bearing unit or the compressed air turbine.
  • the individual shaping air nozzles are in this case supplied from an annular air space, which is arranged on the front side of the rotary atomizer immediately before the shaping air nozzles.
  • the invention is therefore based on the object to optimize the known rotary atomizer described above in terms of the required space and in terms of flow dynamics.
  • the object is achieved, starting from the known rotary atomizer described above according to the preamble of claim 1, by the characterizing features of claim 1 and by a bearing unit with the features of claim 12.
  • the invention includes the general technical teaching, the Lenklufttechnisch not outside between the housing wall of the rotary atomizer and the compressed air turbine, but in the radial direction to arrange further inside.
  • the steering air duct hereby passes at least partially in the axial direction through a bearing unit of the compressed-air turbine, so that it is possible to dispense with routing the steering air conduit around the compressed-air turbine in a complex manner.
  • the bearing unit of the compressed air turbine preferably has an axially continuous bore, which forms part of the shaping air duct.
  • the air turbine consists of two approximately cylindrical sections with different outer diameters, with the turbine wheel being located in the larger outer diameter section.
  • the shaping air duct runs axially through the section of the bearing unit with the larger outer diameter and opens on the side facing the bell cup in a so-called air space, which surrounds the outside of the portion of the bearing unit with a smaller outer diameter.
  • the steering air then passes through one or more arranged in the bearing unit bores to the steering air outlet, said bore emanating from a mouth opening in the lateral surface of the bearing unit and opens into a mouth opening in the bell-plate-side end face of the bearing unit.
  • the bore in the bearing unit starting from the bell-plate-side end face of the bearing unit, initially runs parallel to the axis of rotation of the bell cup and then opens into a radially extending tap hole which opens into the air space on the lateral surface of the bearing unit.
  • the shaping air duct runs essentially kink-free at least over a large part of its length in order to optimize the flow of the shaping air in terms of flow.
  • the shaping air duct preferably has a substantially constant cross-sectional area over at least a large part of its length in order to achieve a uniform flow of the shaping air within the shaping air duct.
  • the shaping air duct has an essentially constant and preferably shoulder-free inner shape over at least a large part of its length.
  • At least two steering air outlets for shaping the spray jet are provided, wherein the steering air outlets are preferably arranged at a different radial distance from the axis of rotation of the bell cup.
  • the individual steering air outlets are in this case preferably fed by separate shaping air ducts with shaping air, whereby there are great freedoms with regard to the shaping of the spray jet.
  • One of the shaping air ducts can here be arranged in the above-described conventional manner outside between the housing wall and the compressed air turbine, while another shaping air duct in the invention described above Way to the housing wall spaced further inside.
  • the drawing shows a cross-sectional view of a rotary atomizer according to the invention.
  • the illustrated rotary atomizer 1 according to the invention is largely of conventional construction, so that reference is made to supplement the following description on the relevant prior art.
  • the rotary atomizer 1 For mounting the rotary atomizer 1 has this on its mounting-side end face a mounting flange 2 with a mounting pin 3, which allows a mechanical attachment to a robot arm of a painting robot.
  • a conventional frustoconical bell cup 4 can be attached, which is shown here only by dashed lines and is driven during operation of the rotary atomizer 1 by a compressed air turbine 5 at a high speed.
  • the rotation of the bell cup 4 in this case means that the introduced into the interior of the bell cup 4 coating agent is accelerated axially and in particular radially and is sprayed on a Glockentellerabrisskante.
  • the drive of the compressed air turbine 5 takes place here by compressed air, which is guided by the painting robot via the mounting flange 2, wherein the supply of the drive air is not shown here for simplicity.
  • a so-called shaping air ring 6 is furthermore provided, which is arranged in the bell-plate-side end face of a housing 7 of the rotary atomizer 1.
  • a plurality of axially directed shaping air nozzles 8, 9 are arranged, via which, during operation of the rotary atomizer 1, a shaping air flow can be blown axially outwardly onto the conical surface of the bell plate 4.
  • the spray jet is shaped and the desired jet width is set.
  • the supply of the shaping air for the two shaping air nozzles 8, 9 takes place here by a respective flange opening 10, 11, which are arranged in the mounting flange 2 of the rotary atomizer 1.
  • the position of the flange opening 10, 11 within the end face of the mounting flange 2 is predetermined by the position of the corresponding terminals on the associated mounting flange of the painting robot.
  • the outer shaping air nozzle 8 is in this case supplied in the conventional manner described above by a steering air line 12, which is guided on the outside of the compressed air turbine 5 between the housing 6 and the compressed-air turbine 5.
  • the flange 10 opens first into an axially extending tap hole 13, which then merges into a radially extending tap hole 14, which finally opens on the outside of a valve housing 15 in a space between the housing 7 and the valve housing 15.
  • the shaping air is then guided past the compressed-air turbine 5 into a so-called air space 16, from where it finally reaches the shaping air nozzle 8 through tap holes 17 in the shaping air ring 6.
  • the Lenkluft effet 18 also passes axially through a bearing unit 19 of the compressed-air turbine 5.
  • the radial distance of the Lenklufttechnisch 18 from the axis of rotation of the bell cup 4 is greater than the outer diameter of the turbine wheel not shown for simplicity, so that the Lenklufttechnisch 18 on the outside of the Turbine wheel runs.
  • the Lenklufttechnisch 18 then opens bell cup side into a further air space 20 which is disposed between a substantially cylindrical portion 21 of the compressed-air turbine 5 and a cover 22 surrounding this.
  • the bores 23 in the section 21 of the compressed air turbine 5 in this case consist of an outgoing from the lateral surface of the section 21 radially extending tap hole and an outgoing from the glockenteller documenten end face of the section 21 axially extending tap hole, which allows easy installation.
  • Another advantage of the shaping air line 18 according to the invention can be seen in the kink-free guidance of the shaping air flow, which is optimized in terms of flow dynamics.
  • the invention is not limited to the preferred embodiment described above.

Landscapes

  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

The rotating atomizer has a rotating shaft for the cup plate (4) to generate a spray stream at the surface to be coated, and at least one deflection outflow (8,9) for deflection air forming the spray stream. An air supply line (18) within the housing (7), to deliver air to the deflection outflows, passes at least partially axially through the bearing unit (19) of the drive turbine (5). The bearing unit has at least one deflection air outlet at its mantle surface, linked by a drilling (23) to the deflection air outlet at the end side towards the cup plate.

Description

Die Erfindung betrifft einen Rotationszerstäuber für eine Beschichtung von Werkstücken gemäß dem Oberbegriff des Anspruchs 1 und eine Lagereinheit gemäß Anspruch 12.The invention relates to a rotary atomizer for coating workpieces according to the preamble of claim 1 and a bearing unit according to claim 12.

In Lackieranlagen werden bekanntermaßen Rotationszerstäuber eingesetzt, bei denen ein sogenannter Glockenteller von einer Druckluftturbine mit hohen Drehzahlen angetrieben wird. Der Glockenteller ist hierbei in der Regel kegelstumpfförmig und erweitert sich in Sprührichtung, wobei das aufzutragende Beschichtungsmittel in dem kegelstumpfförmigen Glockenteller aufgrund der Zentrifugalkräfte axial und insbesondere radial beschleunigt wird, so dass an der Glockentellerabrisskante ein kegelförmiger Sprühstrahl entsteht.In painting plants, rotary atomizers are known to be used, in which a so-called bell plate is driven by a compressed air turbine at high speeds. The bell cup is hereby generally frusto-conical and expands in spray direction, wherein the coating agent to be applied is accelerated axially and in particular radially in the frusto-conical bell cup due to the centrifugal forces, so that a cone-shaped spray jet is formed on the Bell plate tearing edge.

Es ist weiterhin bekannt, die Außenfläche des Glockentellers zur Formung des Sprühstrahls mit einer sogenannten Lenkluft anzublasen, wobei die Lenkluft die Richtung der an der Glockentellerabrisskante abgesprühten Lackpartikel beeinflusst. Durch eine Steuerung der Menge und der Geschwindigkeit der abgeblasenen Lenkluft lässt sich also die Form des Sprühstrahls und damit die Sprühstrahlbreite einstellen.It is also known to inflate the outer surface of the bell cup to form the spray jet with a so-called shaping air, wherein the shaping air influences the direction of sprayed on the Bell plate tearing edge paint particles. By controlling the amount and the speed of the blown shaping air can thus adjust the shape of the spray and thus the spray jet width.

Aus DE 102 02 712 ist ferner bekannt, zwei getrennt voneinander regelbare Lenklüfte auf den Sprühstrahl zu richten.Out DE 102 02 712 is also known to direct two separately controllable Lenklüfte on the spray.

Bei den bekannten Rotationszerstäubern der vorstehend beschriebenen Art wird die Lenkluft durch eine Lenkluftleitung zugeführt, die innerhalb des Gehäuses des Rotationszerstäubers außen zwischen der Gehäusewandung und der Druckluftturbine verläuft. In der montageseitigen Stirnfläche des Rotationszerstäubers mündet die Lenkluftleitung dagegen in einem Einlass, dessen Position durch die entsprechenden Anschlüsse in dem Befestigungsflansch der zugehörigen Beschichtungsmaschine, wie beispielsweise eines Lackierroboters, vorgegeben ist und deshalb nicht verändert werden kann.In the known rotary atomizers of the type described above, the shaping air is supplied through a shaping air duct, which extends outside the housing of the rotary atomizer outside between the housing wall and the compressed-air turbine. In the assembly-side end face of the rotary atomizer opens the Lenkluftleitung, however, in an inlet whose position is predetermined by the corresponding connections in the mounting flange of the associated coating machine, such as a painting robot, and therefore can not be changed.

Nachteilig an der vorstehend beschriebenen Führung der Lenkluftleitung innerhalb des Rotationszerstäubers außen zwischen der Gehäusewandung und der Druckluftturbine ist zunächst die Tatsache, dass der Gehäusedurchmesser des Rotationszerstäubers durch den erforderlichen Querschnitt der Lenkluftleitung vergrößert wird, wobei der für die Druckluftturbine verfügbare Einbauraum durch die Lenkluftleitung verringert wird.A disadvantage of the above-described leadership of Lenkluftleitung inside the rotary atomizer outside between the housing and the compressed air turbine is first the fact that the housing diameter of the rotary atomizer is increased by the required cross-section of the Lenkluftleitung, wherein the installation space available for the compressed air turbine is reduced by the Lenkluftleitung.

Nachteilig an der bekannten Anordndung der Lenkluftleitung ist weiterhin, dass die Lenkluftleitung von dem Anschluss in der montageseitigen Stirnfläche ausgehend zunächst nach außen umgeleitet werden muss, um dann an der Druckluftturbine außen vorbeigeführt werden zu können. Diese Führung der Lenkluftleitung ist jedoch strömungsdynamisch schlecht, da der Strömungswiderstand durch die Richtungsänderungen der Lenkluft erhöht wird und darüber hinaus innerhalb der Lenkluftleitung auch unerwünschte Resonanzeffekte auftreten können, die das Lackierergebnis verschlechtern.A disadvantage of the known arrangement of the Lenkluftleitung is further that the steering air duct must first be redirected from the terminal in the assembly-side end face outward to then be passed to the outside of the compressed air turbine can. However, this guidance of the steering air duct is poor in terms of flow dynamics, since the flow resistance is increased by the changes in direction of the steering air and, moreover, undesired resonance effects which worsen the painting result can also occur within the steering air duct.

Ein derartiger Rotationszerstäuber ist auch aus EP 0 878 238 A1 bekannt. Hierbei wird die Lenkluftleitung in dem Rotationszerstäuber ebenfalls außen um die Lagereinheit bzw. die Druckluftturbine herum geführt. Die einzelnen Lenkluftdüsen werden hierbei aus einem ringförmigen Luftraum versorgt, der an der Stirnseite des Rotationszerstäubers unmittelbar vor den Lenkluftdüsen angeordnet ist.Such a rotary atomizer is also off EP 0 878 238 A1 known. Here, the steering air duct in the rotary atomizer is also guided around the outside of the bearing unit or the compressed air turbine. The individual shaping air nozzles are in this case supplied from an annular air space, which is arranged on the front side of the rotary atomizer immediately before the shaping air nozzles.

Aus US 5 397 063 ist ein weiterer Rotationszerstäuber bekannt, bei dem eine Lenkluftleitung axial durch die Lagereinheit der Druckluftturbine hindurch geführt ist. Die Lenkluftleitung besteht hierbei aus einem Schlauch, der durch eine axial verlaufende Bohrung in der Lagereinheit hindurchgeführt ist und einen Lenkluftring mit Lenkluft versorgt.Out US 5,397,063 Another rotary atomizer is known in which a steering air duct is guided axially through the bearing unit of the compressed air turbine. The Lenkluftleitung here consists of a hose which is passed through an axially extending bore in the bearing unit and supplies a shaping air ring with shaping air.

Der Erfindung liegt somit die Aufgabe zugrunde, den eingangs beschriebenen bekannten Rotationszerstäuber hinsichtlich des erforderlichen Bauraums und in strömungsdynamischer Hinsicht zu optimieren.The invention is therefore based on the object to optimize the known rotary atomizer described above in terms of the required space and in terms of flow dynamics.

Die Aufgabe wird, ausgehend von dem eingangs beschriebenen bekannten Rotationszerstäuber gemäß dem Oberbegriff des Anspruchs 1, durch die kennzeichnenden Merkmale des Anspruchs 1 bzw. durch eine Lagereinheit mit den Merkmalen des Anspruchs 12 gelöst.The object is achieved, starting from the known rotary atomizer described above according to the preamble of claim 1, by the characterizing features of claim 1 and by a bearing unit with the features of claim 12.

Die Erfindung umfasst die allgemeine technische Lehre, die Lenkluftleitung nicht außen zwischen der Gehäusewandung des Rotationszerstäubers und der Druckluftturbine, sondern in radialer Richtung weiter innen anzuordnen.The invention includes the general technical teaching, the Lenkluftleitung not outside between the housing wall of the rotary atomizer and the compressed air turbine, but in the radial direction to arrange further inside.

Erfindungsgemäß geht die Lenkluftleitung hierbei mindestens teilweise in axialer Richtung durch eine Lagereinheit der Druckluftturbine hindurch, so dass darauf verzichtet werden kann, die Lenkluftleitung aufwändig außen um die Druckluftturbine herum zu führen. Die Lagereinheit der Druckluftturbine weist deshalb vorzugsweise eine axial durchgehende Bohrung auf, die einen Teil der Lenkluftleitung bildet.According to the invention, the steering air duct hereby passes at least partially in the axial direction through a bearing unit of the compressed-air turbine, so that it is possible to dispense with routing the steering air conduit around the compressed-air turbine in a complex manner. Therefore, the bearing unit of the compressed air turbine preferably has an axially continuous bore, which forms part of the shaping air duct.

In der Regel besteht die Druckluftturbine aus zwei annähernd zylindrischen Abschnitten mit unterschiedlichen Außendurchmessern, wobei das Turbinenrad in dem Abschnitt mit dem größeren Außendurchmesser angeordnet ist. Vorzugsweise verläuft die Lenkluftleitung hierbei axial durch den Abschnitt der Lagereinheit mit dem größeren Außendurchmesser und mündet auf der dem Glockenteller zugewandten Seite in einen sogenannte Luftraum, der den Abschnitt der Lagereinheit mit einem kleineren Außendurchmesser außen umgibt. Aus diesem sogenannten Luftraum gelangt die Lenkluft dann durch eine oder mehrere in der Lagereinheit angeordnete Bohrungen zu dem Lenkluftauslass, wobei diese Bohrung von einer Mündungsöffnung in der Mantelfläche der Lagereinheit ausgeht und in eine Mündungsöffnung in der glockentellerseitigen Stirnfläche der Lagereinheit mündet.Typically, the air turbine consists of two approximately cylindrical sections with different outer diameters, with the turbine wheel being located in the larger outer diameter section. Preferably, the shaping air duct runs axially through the section of the bearing unit with the larger outer diameter and opens on the side facing the bell cup in a so-called air space, which surrounds the outside of the portion of the bearing unit with a smaller outer diameter. From this so-called air space, the steering air then passes through one or more arranged in the bearing unit bores to the steering air outlet, said bore emanating from a mouth opening in the lateral surface of the bearing unit and opens into a mouth opening in the bell-plate-side end face of the bearing unit.

Gemäß der Erfindung verläuft die Bohrung in der Lagereinheit dagegen ausgehend von der glockentellerseitigen Stirnfläche der Lagereinheit zunächst parallel zu der Drehachse des Glockentellers und mündet dann in eine radial verlaufende Stichbohrung, die an der Mantelfläche der Lagereinheit in den Luftraum mündet.According to the invention, however, the bore in the bearing unit, starting from the bell-plate-side end face of the bearing unit, initially runs parallel to the axis of rotation of the bell cup and then opens into a radially extending tap hole which opens into the air space on the lateral surface of the bearing unit.

Vorzugsweise verläuft die Lenkluftleitung mindestens auf einem Großteil ihrer Länge im Wesentlichen knickfrei, um die Strömung der Lenkluft strömungstechnisch zu optimieren.Preferably, the shaping air duct runs essentially kink-free at least over a large part of its length in order to optimize the flow of the shaping air in terms of flow.

Darüber hinaus weist die Lenkluftleitung vorzugsweise mindestens auf einem Großteil ihrer Länge eine im Wesentlichen konstante Querschnittsfläche auf, um eine gleichmäßige Strömung der Lenkluft innerhalb der Lenkluftleitung zu erreichen.In addition, the shaping air duct preferably has a substantially constant cross-sectional area over at least a large part of its length in order to achieve a uniform flow of the shaping air within the shaping air duct.

Dies wird vorzugsweise dadurch unterstützt, dass die Lenkluftleitung mindestens auf einem Großteil ihrer Länge eine im Wesentlichen konstante und vorzugsweise absatzfreie Innenform aufweist.This is preferably supported by the fact that the shaping air duct has an essentially constant and preferably shoulder-free inner shape over at least a large part of its length.

In einer vorteilhaften Weiterbildung der Erfindung sind vorzugsweise mindestens zwei Lenkluftauslässe zur Formung des Sprühstrahls vorgesehen, wobei die Lenkluftauslässe vorzugsweise in einem unterschiedlichen radialen Abstand zu der Drehachse des Glockentellers angeordnet sind. Die einzelnen Lenkluftauslässe werden hierbei vorzugsweise durch getrennte Lenkluftleitungen mit Lenkluft gespeist, wodurch hinsichtlich der Formung des Sprühstrahls große Freiheiten bestehen.In an advantageous development of the invention, preferably at least two steering air outlets for shaping the spray jet are provided, wherein the steering air outlets are preferably arranged at a different radial distance from the axis of rotation of the bell cup. The individual steering air outlets are in this case preferably fed by separate shaping air ducts with shaping air, whereby there are great freedoms with regard to the shaping of the spray jet.

Eine der Lenkluftleitungen kann hierbei in der eingangs beschriebenen herkömmlichen Weise außen zwischen der Gehäusewand und der Druckluftturbine angeordnet sein, während eine andere Lenkluftleitung in der vorstehend beschriebenen erfindungsgemäßen Weise zu der Gehäusewandung beabstandet weiter innen angeordnet ist.One of the shaping air ducts can here be arranged in the above-described conventional manner outside between the housing wall and the compressed air turbine, while another shaping air duct in the invention described above Way to the housing wall spaced further inside.

Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet oder werden nachstehend zusammen mit der Beschreibung des bevorzugten Ausführungsbeispiels der Erfindung anhand der Zeichnung näher erläutert.Other advantageous developments of the invention are characterized in the subclaims or are explained in more detail below together with the description of the preferred embodiment of the invention with reference to the drawing.

Die Zeichnung zeigt eine Querschnittsansicht eines erfindungsgemäßen Rotationszerstäubers.The drawing shows a cross-sectional view of a rotary atomizer according to the invention.

Der dargestellte erfindungsgemäße Rotationszerstäuber 1 ist weitgehend herkömmlich aufgebaut, so dass zur Ergänzung der folgenden Beschreibung auf den einschlägigen Stand der Technik verwiesen wird.The illustrated rotary atomizer 1 according to the invention is largely of conventional construction, so that reference is made to supplement the following description on the relevant prior art.

Zur Montage des Rotationszerstäubers 1 weist dieser an seiner montageseitigen Stirnfläche einen Befestigungsflansch 2 mit einem Befestigungszapfen 3 auf, der eine mechanische Befestigung an einem Roboterarm eines Lackierroboters ermöglicht.For mounting the rotary atomizer 1 has this on its mounting-side end face a mounting flange 2 with a mounting pin 3, which allows a mechanical attachment to a robot arm of a painting robot.

An dem Rotationszerstäuber 1 kann ein herkömmlicher kegelstumpfförmiger Glockenteller 4 angebracht werden, der hier nur gestrichelt wiedergegeben ist und im Betrieb des Rotationszerstäubers 1 durch eine Druckluftturbine 5 mit einer hohen Drehzahl angetrieben wird. Die Drehung des Glockentellers 4 führt hierbei dazu, dass das in das Innere des Glockentellers 4 eingeführte Beschichtungsmittel axial und insbesondere radial beschleunigt wird und an einer Glockentellerabrisskante abgesprüht wird.On the rotary atomizer 1, a conventional frustoconical bell cup 4 can be attached, which is shown here only by dashed lines and is driven during operation of the rotary atomizer 1 by a compressed air turbine 5 at a high speed. The rotation of the bell cup 4 in this case means that the introduced into the interior of the bell cup 4 coating agent is accelerated axially and in particular radially and is sprayed on a Glockentellerabrisskante.

Der Antrieb der Druckluftturbine 5 erfolgt hierbei durch Druckluft, die von dem Lackierroboter über den Befestigungsflansch 2 geführt wird, wobei die Zuführung der Antriebsluft hier zur Vereinfachung nicht dargestellt ist.The drive of the compressed air turbine 5 takes place here by compressed air, which is guided by the painting robot via the mounting flange 2, wherein the supply of the drive air is not shown here for simplicity.

Zur Formung des von dem Glockenteller 4 abgegebenen Sprühstrahls ist weiterhin ein sogenannter Lenkluftring 6 vorgesehen, der in der glockentellerseitigen Stirnfläche eines Gehäuses 7 des Rotationszerstäubers 1 angeordnet ist. In dem Lenkluftring 6 sind mehrere axial ausgerichtete Lenkluftdüsen 8, 9 angeordnet, über die im Betrieb des Rotationszerstäubers 1 ein Lenkluftstrom axial außen auf die kegelförmige Mantelfläche des Glockentellers 4 geblasen werden kann. In Abhängigkeit von der Menge und der Geschwindigkeit der aus den Lenkluftdüsen 8, 9 ausgeblasenen Lenkluft wird so der Sprühstrahl geformt und die gewünschte Strahlbreite eingestellt.To form the spray jet emitted by the bell cup 4, a so-called shaping air ring 6 is furthermore provided, which is arranged in the bell-plate-side end face of a housing 7 of the rotary atomizer 1. In the shaping air ring 6, a plurality of axially directed shaping air nozzles 8, 9 are arranged, via which, during operation of the rotary atomizer 1, a shaping air flow can be blown axially outwardly onto the conical surface of the bell plate 4. Depending on the quantity and the speed of the shaping air blown out of the shaping air nozzles 8, 9, the spray jet is shaped and the desired jet width is set.

Die Zuführung der Lenkluft für die beiden Lenkluftdüsen 8, 9 erfolgt hierbei durch jeweils eine Flanschöffnung 10, 11, die in dem Befestigungsflansch 2 des Rotationszerstäubers 1 angeordnet sind. Die Position der Flanschöffnung 10, 11 innerhalb der Stirnfläche des Befestigungsflansches 2 ist hierbei durch die Position der entsprechenden Anschlüsse an dem zugehörigen Befestigungsflansch des Lackierroboters vorgegeben.The supply of the shaping air for the two shaping air nozzles 8, 9 takes place here by a respective flange opening 10, 11, which are arranged in the mounting flange 2 of the rotary atomizer 1. The position of the flange opening 10, 11 within the end face of the mounting flange 2 is predetermined by the position of the corresponding terminals on the associated mounting flange of the painting robot.

Die außenliegende Lenkluftdüse 8 wird hierbei in der eingangs beschriebenen herkömmlichen Weise durch eine Lenkluftleitung 12 versorgt, die an der Außenseite der Druckluftturbine 5 zwischen dem Gehäuse 6 und der Druckluftturbine 5 entlang geführt ist. Hierzu mündet die Flanschöffnung 10 zunächst in eine axial verlaufende Stichbohrung 13, die dann in eine radial verlaufende Stichbohrung 14 übergeht, die schließlich an der Außenseite eines Ventilgehäuses 15 in einen Zwischenraum zwischen dem Gehäuse 7 und dem Ventilgehäuse 15 mündet. Die Lenkluft wird dann an der Druckluftturbine 5 vorbei in einen sogenannten Luftraum 16 geführt, von wo sie schließlich durch Stichbohrungen 17 in dem Lenkluftring 6 zu der Lenkluftdüse 8 gelangt.The outer shaping air nozzle 8 is in this case supplied in the conventional manner described above by a steering air line 12, which is guided on the outside of the compressed air turbine 5 between the housing 6 and the compressed-air turbine 5. For this purpose, the flange 10 opens first into an axially extending tap hole 13, which then merges into a radially extending tap hole 14, which finally opens on the outside of a valve housing 15 in a space between the housing 7 and the valve housing 15. The shaping air is then guided past the compressed-air turbine 5 into a so-called air space 16, from where it finally reaches the shaping air nozzle 8 through tap holes 17 in the shaping air ring 6.

Die Zuführung der Lenkluft für die Lenkluftdüse 9 erfolgt dagegen durch eine Lenkluftleitung 18, die von der Flanschöffnung 11 in dem Befestigungsflansch 2 ausgehend axial und knickfrei durch das Ventilgehäuse 15 hindurch geht. Darüber hinaus geht die Lenkluftleitung 18 auch axial durch eine Lagereinheit 19 der Druckluftturbine 5. Der radiale Abstand der Lenkluftleitung 18 von der Drehachse des Glockentellers 4 ist hierbei größer als der Außendurchmesser des zur Vereinfachung nicht dargestellten Turbinenrads, so dass die Lenkluftleitung 18 an der Außenseite des Turbinenrades verläuft. Die Lenkluftleitung 18 mündet dann glockentellerseitig in einen weiteren Luftraum 20, der zwischen einem im Wesentlichen zylindrischen Abschnitt 21 der Druckluftturbine 5 und einer diesen umgebenden Abdeckung 22 angeordnet ist.The supply of the shaping air for the shaping air nozzle 9, however, takes place by means of a shaping air line 18 which extends from the flange opening 11 in the mounting flange 2 starting from axially and without kinks passes through the valve housing 15 therethrough. In addition, the Lenkluftleitung 18 also passes axially through a bearing unit 19 of the compressed-air turbine 5. The radial distance of the Lenkluftleitung 18 from the axis of rotation of the bell cup 4 is greater than the outer diameter of the turbine wheel not shown for simplicity, so that the Lenkluftleitung 18 on the outside of the Turbine wheel runs. The Lenkluftleitung 18 then opens bell cup side into a further air space 20 which is disposed between a substantially cylindrical portion 21 of the compressed-air turbine 5 and a cover 22 surrounding this.

In der Mantelfläche des Abschnitts 21 befinden sich mehrere Bohrungen 23, die in der glockentellerseitigen Stirnfläche der Druckluftturbine münden und schließlich in die Lenkluftdüsen 9 münden. Die Bohrungen 23 in dem Abschnitt 21 der Druckluftturbine 5 bestehen hierbei aus einer von der Mantelfläche des Abschnitts 21 ausgehenden radial verlaufenden Stichbohrung und einer von der glockentellerseitigen Stirnfläche des Abschnitts 21 ausgehenden axial verlaufenden Stichbohrung, was eine einfache Montage ermöglicht.In the lateral surface of the portion 21 are a plurality of holes 23 which open into the bell-plate-side end face of the compressed-air turbine and finally open into the shaping air nozzles 9. The bores 23 in the section 21 of the compressed air turbine 5 in this case consist of an outgoing from the lateral surface of the section 21 radially extending tap hole and an outgoing from the glockentellerseitigen end face of the section 21 axially extending tap hole, which allows easy installation.

Vorteilhaft an der vorstehend beschriebenen Anordnung der zusätzlichen Lenkluftleitung 18 ist zunächst die Tatsache, dass der Durchmesser des Gehäuses 7 des Rotationszerstäubers 1 durch die zusätzliche Lenkluftleitung 18 nicht vergrößert wird und auch der für die Druckluftturbine 5 verfügbare Bauraum durch die Lenkluftleitung 18 nicht verringert wird.An advantage of the above-described arrangement of the additional steering air duct 18 is first the fact that the diameter of the housing 7 of the rotary atomizer 1 is not increased by the additional Lenkluftleitung 18 and also available for the compressed air turbine 5 space is not reduced by the Lenkluftleitung 18.

Ein weiterer Vorteil der erfindungsgemäßen Lenkluftleitung 18 ist in der knickfreien Führung des Lenkluftstroms zu sehen, die strömungsdynamisch optimiert ist.Another advantage of the shaping air line 18 according to the invention can be seen in the kink-free guidance of the shaping air flow, which is optimized in terms of flow dynamics.

Die Erfindung ist nicht auf das vorstehend beschriebene bevorzugte Ausführungsbeispiel beschränkt.The invention is not limited to the preferred embodiment described above.

Claims (12)

  1. Rotary atomiser (1) for the coating of workpieces, comprising
    a) a rotatable bell cup shaft for a bell cup (4) for emitting a spray jet of a coating medium,
    b) at least one shaping air outlet (8, 9) for emitting shaping air in order to shape the spray jet,
    c) a housing (7),
    d) a turbine (5) with a turbine wheel for driving the bell cup (4), the turbine (5) comprising two approximately cylindrical sections having different outer diameters and the turbine wheel is arranged in the section having the larger outer diameter,
    e) a bearing unit (19) for the turbine (5), said bearing unit being arranged in the housing (7) of the rotary atomiser (1)
    f) at least one shaping air line (18) arranged in the housing (7) and opening into the shaping air outlet (8, 9) for feeding in the shaping air, the shaping air line (18) extending at least partially axially through the bearing unit (19) and the shaping air line (18) extending axially through the section of the turbine (5) which has the larger outer diameter,
    characterised in that,
    g) bores (23) which open into the bell cup-side end face of the turbine (5) and finally open into the shaping air outlet (9) are arranged in the outer surface of the section (21) of smaller outer diameter, and
    h) the bores (23) in the section (21) of smaller outer diameter consist of a bore extending radially starting from the outer surface and a bore extending axially starting from the bell cup-side end face of the section (21) of smaller outer diameter.
  2. Rotary atomiser (1) according to claim 1, characterised in that the shaping air line (18) extends at a radial distance from the rotation axis of the bell cup (4), said distance being greater than the outer diameter of the turbine wheel and smaller than the outer diameter of the bearing unit (19).
  3. Rotary atomiser (1) according to at least one of the preceding claims, characterised in that the shaping air line (18) extends at least over a large part of the length thereof essentially kink-free.
  4. Rotary atomiser (1) according to at least one of the preceding claims, characterised in that the shaping air line (18) extends at least over a large part of the length thereof essentially parallel to the rotation axis of the bell cup (4).
  5. Rotary atomiser (1) according to at least one of the preceding claims, characterised in that the shaping air line (18) has an essentially constant cross-sectional area along at least a large part of the length thereof.
  6. Rotary atomiser (1) according to at least one of the preceding claims, characterised in that the shaping air line (18) has an essentially constant cross-sectional form along at least a large part of the length thereof.
  7. Rotary atomiser (1) according to at least one of the preceding claims, characterised in that the shaping air line (18) has a stepless interior form along at least a large part of the length thereof.
  8. Rotary atomiser (1) according to at least one of the preceding claims, characterised in that at least two shaping air outlets (8, 9) are provided for shaping the spray jet.
  9. Rotary atomiser (1) according to claim 8, characterised in that the shaping air outlets (8, 9) are arranged at different radial distances from the rotation axis of the bell cup (4).
  10. Rotary atomiser (1) according to claim 8 and/or claim 9, characterised in that in order to supply shaping air to the individual shaping air outlets (8, 9), separate shaping air lines (12, 18) are provided.
  11. Rotary atomiser (1) according to claim 10, characterised in that a first shaping air line (18) is arranged spaced at a distance inwardly from the housing (7), whereas a second shaping air line (12) is arranged at a distance outwardly, directly adjacent to the housing (7).
  12. Bearing unit (19) comprising a turbine (5) for driving a bell cup (4) in a rotary atomiser (1), the turbine (5) comprising two approximately cylindrical sections with different outer diameters and the turbine wheel is arranged in the section of larger outer diameter, a bell cup shaft being rotatably mounted in the bearing unit (19) and a turbine wheel being arranged on the bell cup shaft, with a shaping air line (18) extending axially through the section of larger outer diameter, said shaping air line (18) being connectable to a shaping air line (11) of the rotary atomiser,
    characterised in that,
    - bores (23) are arranged in the outer surface of the section (21) of smaller outer diameter, said bores opening into the bell cup-side end face of the turbine (5) and finally opening into the shaping air outlet (9), and
    - that, in the section (21) of smaller outer diameter, the bores (23) comprise a bore extending radially from the outer surface and a bore extending axially from the bell cup-side end face of the section (21) of smaller outer diameter.
EP03016335A 2002-07-22 2003-07-18 Rotary sprayer and bearing for this sprayer Expired - Lifetime EP1384514B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200331712T SI1384514T1 (en) 2002-07-22 2003-07-18 Rotary sprayer and bearing for this sprayer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10233198A DE10233198A1 (en) 2002-07-22 2002-07-22 rotary atomizers
DE10233198 2002-07-22

Publications (3)

Publication Number Publication Date
EP1384514A2 EP1384514A2 (en) 2004-01-28
EP1384514A3 EP1384514A3 (en) 2005-10-26
EP1384514B1 true EP1384514B1 (en) 2009-09-09

Family

ID=29796497

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Application Number Title Priority Date Filing Date
EP03016335A Expired - Lifetime EP1384514B1 (en) 2002-07-22 2003-07-18 Rotary sprayer and bearing for this sprayer

Country Status (6)

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US (1) US7036750B2 (en)
EP (1) EP1384514B1 (en)
AT (1) ATE442206T1 (en)
DE (2) DE10233198A1 (en)
ES (1) ES2333208T3 (en)
SI (1) SI1384514T1 (en)

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WO2019015843A1 (en) 2017-07-20 2019-01-24 Audi Ag Rotary atomizer with improved securing system for the bell cup
DE102017212480A1 (en) 2017-07-20 2019-01-24 Audi Ag Rotary atomizer with improved mounting system for the bell cup
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Also Published As

Publication number Publication date
ES2333208T3 (en) 2010-02-18
US7036750B2 (en) 2006-05-02
US20040129799A1 (en) 2004-07-08
DE50311882D1 (en) 2009-10-22
EP1384514A2 (en) 2004-01-28
SI1384514T1 (en) 2010-01-29
EP1384514A3 (en) 2005-10-26
DE10233198A1 (en) 2004-02-05
ATE442206T1 (en) 2009-09-15

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