EP1250960A2 - Spray bell and rotary sprayer - Google Patents

Spray bell and rotary sprayer Download PDF

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Publication number
EP1250960A2
EP1250960A2 EP02007858A EP02007858A EP1250960A2 EP 1250960 A2 EP1250960 A2 EP 1250960A2 EP 02007858 A EP02007858 A EP 02007858A EP 02007858 A EP02007858 A EP 02007858A EP 1250960 A2 EP1250960 A2 EP 1250960A2
Authority
EP
European Patent Office
Prior art keywords
bell
edge
atomizer
concave
bell plate
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.)
Ceased
Application number
EP02007858A
Other languages
German (de)
French (fr)
Other versions
EP1250960A3 (en
Inventor
Hans-Jürgen Dr. Nolte
Peter Marquardt
Harry Krumma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP1250960A2 publication Critical patent/EP1250960A2/en
Publication of EP1250960A3 publication Critical patent/EP1250960A3/en
Ceased legal-status Critical Current

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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
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • the invention relates to a bell cup for a rotary atomizer according to the preamble of claim 1, in particular for an electrostatic rotary atomizer for series coating of workpieces such as vehicle bodies.
  • the bell outer surface considered here ranges from one on the atomizer side Edge on which they may be in an axial peripheral part of the bell plate can pass up to the tear-off or spray edge of the bell plate.
  • Most currently common Bell plates have a straight cross-section in this area conical or more or less convex, i.e. outward curved outer surface.
  • the object of the invention is a bell plate or an atomizer with a bell plate specify the size of the atomizing and setting and Form of the spray jet requires less air than before.
  • FIG. 1 Bell plate with a straight or convex shape of the bell outer surface 1 or 1 'from an atomizer-side edge 2 to the spray edge 3.
  • steering air is supplied to the depending on the atomizer construction, axially parallel or in different ones Angle according to arrows 6 and 6 ' hit the surface 1 or according to the arrows 7 or 7 'flow past the bell plate outside the circumference air can also be against the drawing plane in or against the Direction of rotation of the bell plate must be inclined, e.g. can also result in swirl or whirling movements of the steering air.
  • the steering air cushion 8 forms on the surface 1 (or 1 ′) out.
  • Fig.2 This shows the schematically illustrated bell plate 1 that the bell outer surface 10 from Edge 12 to the spray edge 13 or at least up to it Immediate proximity concave, i.e. as shown inwards is arched.
  • the curvature curve is preferably continuous without turning point.
  • the concave curvature can in which the axis of rotation containing cross-section, for example circular, elliptical, parabolic or hyperbolic and at practical embodiments also be flatter than in the schematic representation.
  • the start and end stretches of this Curves can, but do not have to, run tangentially, depending on Expediency.
  • the steering air according to arrow 6 for example striking the surface 10 axially parallel and not outside the spray edge 13 flows past (arrow 7 in Fig. 1).
  • the steering air can also be selected from appropriately selected angles hit the surface 10 according to the arrow 6 'in FIG. 1.
  • the concave shape of the bell outer surface described here is to be distinguished from individual dent-like depressions, such as they are known, for example, in golf balls. Such recesses in the bell plate outside could with Complete paint particles or other impurities and would only require a lot of time and detergents clean. This problem exists with the one described here Bell plate not.

Abstract

The bell plate has a rotary-symmetrical outer surface (10), which increase in size towards the spray edge (13), and is concave in the area next to the edge. A section of the outer surface containing the rotary axis, is curved inwards in a circular, elliptical, parabolic, or hyperbolic manner. Steering air (6) is directed from the atomizer mainly to an area of the outer bell surface located within the concave section.

Description

Die Erfindung betrifft einen Glockenteller für einen Rotationszerstäuber gemäß dem Oberbegriff des Anspruchs 1, insbesondere für einen elektrostatischen Rotationszerstäuber für die Serienbeschichtung von Werkstücken wie beispielsweise Fahrzeugkarossen.The invention relates to a bell cup for a rotary atomizer according to the preamble of claim 1, in particular for an electrostatic rotary atomizer for series coating of workpieces such as vehicle bodies.

In üblichen Rotationszerstäubern dieser Art (DE 4306800 A) wird bekanntlich aus dem Zerstäuber auf die mehr oder weniger konische Glockenaußenfläche Lenkluft gerichtet, die den an der Glockentellerabrisskante an sich radial abgesprühten Lackpartikeln zusätzlich zu den elektrostatischen Kräften einen Impuls in Richtung zum Werkstück gibt und zudem zur Sprühstrahlformung und teilweise auch zur Unterstützung beim Zerstäuben dienen kann. Durch die Lenkluft entsteht bei Rotation des Glockentellers ein Luftpolster auf der Außenfläche und infolgedessen eine gleichmäßige Luftverteilung an der Glockentellerabrisskante für die Strahlformung und ggf. Zerstäubung. Die Gesamtluftmenge für das Luftpolster kann auch aus der Umgebung angesaugte zusätzliche Luft enthalten. Generell wird durch die Lenkluft ein homogener Sprühstrahl und damit gute und gleichmäßige Beschichtung des Werkstücks erreicht.In conventional rotary atomizers of this type (DE 4306800 A) famously from the atomizer to the more or less conical Bell outer surface directed air, which at the bell plate tear-off edge additionally radially sprayed paint particles a pulse towards the electrostatic forces to the workpiece and also for spray jet shaping and partially can also be used to support atomization. Through the Guided air creates an air cushion when the bell plate rotates on the outer surface and consequently an even air distribution at the bell plate tear-off edge for beam shaping and atomization if necessary. The total amount of air for the air cushion can also contain additional air drawn in from the environment. As a general rule becomes a homogeneous spray jet and thus with the steering air good and even coating of the workpiece is achieved.

Die hier betrachtete Glockenaußenfläche reicht von einem zerstäuberseitigen Rand, an dem sie ggf. in einen axialen Umfangsteil des Glockentellers übergehen kann, bis zu der Abriss- oder Absprühkante des Glockentellers. Die meisten derzeit üblichen Glockenteller haben in diesem Bereich eine im Querschnitt geradlinig konische oder mehr oder weniger konvexe, also nach außen gewölbte Außenfläche. The bell outer surface considered here ranges from one on the atomizer side Edge on which they may be in an axial peripheral part of the bell plate can pass up to the tear-off or spray edge of the bell plate. Most currently common Bell plates have a straight cross-section in this area conical or more or less convex, i.e. outward curved outer surface.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, einen Glockenteller bzw. einen Zerstäuber mit einem Glockenteller anzugeben, der beim Zerstäuben und zur Einstellung der Größe und Form des Sprühstrahls geringere Luftmengen benötigt als bisher.Proceeding from this, the object of the invention is a bell plate or an atomizer with a bell plate specify the size of the atomizing and setting and Form of the spray jet requires less air than before.

Diese Aufgabe wird durch die Merkmale der Patentansprüche gelöst.This object is solved by the features of the claims.

Durch ihre hier beschriebene Form entsteht bei Rotation auf der Glockentelleraußenfläche ein Unterdruckgebiet (im Prinzip ähnlich wie bei Flugzeug-Tragflügelprofilen), wodurch das Lenkluftpolster radial nach innen angedrückt wird und dadurch effektiver wirkt. U. a. wird dadurch der Energieaufwand für die Erzeugung der Lenkluft herabgesetzt.Due to the shape described here, rotation occurs on the Bell plate outer surface a negative pressure area (in principle similar as with aircraft wing profiles), which creates the steering air cushion is pressed radially inwards and thus acts more effectively. Among other things the energy expenditure for the generation of the steering air reduced.

Anhand der Zeichnung wird die Erfindung näher erläutert. Es zeigen

Fig. 1
einen typischen Glockenteller bekannter Form in schematischer Darstellung; und
Fig. 2
ein zweckmäßiges Ausführungsbeispiel eines Glockentellers gemäß der Erfindung.
The invention is explained in more detail with reference to the drawing. Show it
Fig. 1
a typical bell plate of known shape in a schematic representation; and
Fig. 2
an appropriate embodiment of a bell plate according to the invention.

Stand der Technik ist der in Fig. 1 schematisch dargestellte Glockenteller mit geradlinigem oder konvexem Verlauf der Glockenaußenfläche 1 bzw. 1' von einem zerstäuberseitigen Rand 2 bis zur Absprühkante 3. Aus einem (nicht dargestellten) rückwärtigen Teil des Zerstäubers, an dem der Glockenteller um die Achse 4 rotierend gelagert ist, wird Lenkluft zugeführt, die je nach Zerstäuberkonstruktion achsparallel oder in unterschiedlichen Winkeln entsprechend den Pfeilen 6 bzw. 6' auf die Fläche 1 auftreffen oder entsprechend den Pfeilen 7 bzw. 7' außerhalb'des Umfangs an dem Glockenteller vorbeiströmen luft können auch gegen die Zeichenebene in oder gegen die Drehrichtung des Glockentellers geneigt sein, wobei sich z.B. auch Drall- oder Wirbelbewegungen der Lenkluft ergeben können. An der Fläche 1 (bzw. 1' bildet sich das Lenkluftpolster 8 aus.The prior art is that shown schematically in FIG. 1 Bell plate with a straight or convex shape of the bell outer surface 1 or 1 'from an atomizer-side edge 2 to the spray edge 3. From a rear (not shown) Part of the atomizer on which the bell plate around the Axis 4 is rotatably mounted, steering air is supplied to the depending on the atomizer construction, axially parallel or in different ones Angle according to arrows 6 and 6 ' hit the surface 1 or according to the arrows 7 or 7 'flow past the bell plate outside the circumference air can also be against the drawing plane in or against the Direction of rotation of the bell plate must be inclined, e.g. can also result in swirl or whirling movements of the steering air. The steering air cushion 8 forms on the surface 1 (or 1 ′) out.

Der als Ausführungsbeispiel der Erfindung in Fig.2 ebenfalls schematisch dargestellte Glockenteller unterscheidet sich dadurch von dem nach Fig. 1, daß die Glockenaußenfläche 10 vom Rand 12 bis zur Absprühkante 13 oder jedenfalls bis in deren unmittelbare Nähe konkav, also darstellungsgemäß nach innen gewölbt ist. Die Wölbungskurve verläuft vorzugsweise stetig ohne Wendepunkt. Die konkave Wölbung kann in dem die Rotationsachse enthaltenden Querschnitt beispielsweise kreisförmig, elliptisch, parabolisch oder hyperbolisch verlaufen und bei praktischen Ausführungsformen auch flacher sein als in der schematischen Darstellung. Die Anfangs- und Endstrecken dieser Kurve können, müssen aber nicht tangential verlaufen, je nach Zweckmäßigkeit.The same as an embodiment of the invention in Fig.2 This shows the schematically illustrated bell plate 1 that the bell outer surface 10 from Edge 12 to the spray edge 13 or at least up to it Immediate proximity concave, i.e. as shown inwards is arched. The curvature curve is preferably continuous without turning point. The concave curvature can in which the axis of rotation containing cross-section, for example circular, elliptical, parabolic or hyperbolic and at practical embodiments also be flatter than in the schematic representation. The start and end stretches of this Curves can, but do not have to, run tangentially, depending on Expediency.

Wie schon erwähnt wurde, bildet sich in dem durch die Wölbung entstandenen Raum 17 ein Unterdruckgebiet aus, durch den das Luftpolster 18 an die Fläche 10 angedrückt wird.As already mentioned, it is formed by the curvature created room 17 from a negative pressure area through which the Air cushion 18 is pressed against the surface 10.

Für den durch die konkave Form der Glockenaußenfläche angestrebten Zweck ist es wegen der größeren Effektivität zu bevorzugen, daß die Lenkluft entsprechend dem Pfeil 6 beispielsweise achsparallel auf die Fläche 10 auftrifft und nicht außerhalb der Absprühkante 13 vorbeifließt (Pfeil 7 in Fig. 1). Die Lenkluft kann aber auch aus zweckmäßig gewählten Winkeln entsprechend dem Pfeil 6' in Fig. 1 auf die Fläche 10 auftreffen. For the one sought by the concave shape of the bell outer surface Purpose is to prefer because of the greater effectiveness that the steering air according to arrow 6, for example striking the surface 10 axially parallel and not outside the spray edge 13 flows past (arrow 7 in Fig. 1). The steering air can also be selected from appropriately selected angles hit the surface 10 according to the arrow 6 'in FIG. 1.

Die hier beschriebene konkave Form der Glockenaußenfläche ist zu unterscheiden von einzelnen dellenartigen Vertiefungen, wie sie beispielsweise bei Golfbällen bekannt sind. Derartige Vertiefungen in der Glockentelleraußenseite könnten sich mit Lackpartikeln oder sonstigen Verunreinigungen vollsetzen und wären nur mit erheblichem Aufwand an Zeit und Spülmitteln zu reinigen. Dieses Problem besteht bei dem hier beschriebenen Glockenteller nicht.The concave shape of the bell outer surface described here is to be distinguished from individual dent-like depressions, such as they are known, for example, in golf balls. Such recesses in the bell plate outside could with Complete paint particles or other impurities and would only require a lot of time and detergents clean. This problem exists with the one described here Bell plate not.

Claims (4)

Glockenteller für einen Rotationszerstäuber zum Beschichten von Werkstücken
   mit einer rotationssymmetrischen Glockenaußenfläche (10), deren Durchmesser sich zu der Absprühkante (13) hin vergrößert,
   und auf die während der Beschichtung Lenkluft (6) gerichtet wird,
   dadurch gekennzeichnet, daß die Glockenaußenfläche (10) zumindest in dem an die Absprühkante (13) angrenzenden Bereich konkav geformt ist.Bell plate for a rotary atomizer for coating workpieces
with a rotationally symmetrical bell outer surface (10), the diameter of which increases towards the spray edge (13),
and directed to the steering air (6) during the coating,
characterized in that the bell outer surface (10) is concave at least in the area adjacent to the spray edge (13). Glockenteller nach Anspruch 1, dadurch gekennzeichnet, daß die Glockenaußenfläche (10) in einem die Rotationsachse (4) enthaltenden Querschnitt kreisförmig, elliptisch, parabolisch oder hyperbolisch nach innen gewölbt ist.Bell plate according to Claim 1, characterized in that the bell outer surface (10) is curved in a circular, elliptical, parabolic or hyperbolic manner in a cross section containing the axis of rotation (4). Glockenteller nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die konkave Wölbung stetig und ohne Wendepunkt von einem zerstäuberseitigen Rand (12) der Glockenaußenfläche (10) bis zu der Absprühkante (13) oder bis in deren Nähe verläuft.Bell plate according to claim 1 or 2, characterized in that the concave curvature runs continuously and without a turning point from an atomizer-side edge (12) of the bell outer surface (10) to the spraying edge (13) or in the vicinity thereof. Rotationszerstäuber mit einem Glockenteller nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Lenkluft (6) aus dem Zerstäuber zumindest im wesentlichen auf einen innerhalb der konkaven Glockenaußenfläche (10) liegenden Bereich gerichtet wird.Rotary atomizer with a bell cup according to one of Claims 1 to 3, characterized in that the steering air (6) from the atomizer is directed at least essentially to an area lying within the concave outer bell surface (10).
EP02007858A 2001-04-17 2002-04-08 Spray bell and rotary sprayer Ceased EP1250960A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10118741 2001-04-17
DE10118741A DE10118741A1 (en) 2001-04-17 2001-04-17 Bell plate and rotary atomizer

Publications (2)

Publication Number Publication Date
EP1250960A2 true EP1250960A2 (en) 2002-10-23
EP1250960A3 EP1250960A3 (en) 2005-04-13

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EP02007858A Ceased EP1250960A3 (en) 2001-04-17 2002-04-08 Spray bell and rotary sprayer

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EP (1) EP1250960A3 (en)
DE (1) DE10118741A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008068005A1 (en) 2006-12-06 2008-06-12 Dürr Systems GmbH Guiding air ring comprising a ring cavity and corresponding bell plate
WO2009005915A1 (en) * 2007-07-03 2009-01-08 Illinois Tool Works Inc. Spray device having a parabolic flow surface
DE102008027997A1 (en) 2008-06-12 2009-12-24 Dürr Systems GmbH Universalzerstäuber
CN112044611A (en) * 2020-09-22 2020-12-08 党如童 Rainfall type water-saving irrigation spray head

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3105186A1 (en) * 1981-02-13 1982-09-09 Kümmel, Joachim, Dipl.-Ing., 4044 Kaarst Rotary atomiser
JP2000000496A (en) * 1998-06-12 2000-01-07 Asahi Sunac Corp Electrostatic coating gun using rotary atomizing head

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008068005A1 (en) 2006-12-06 2008-06-12 Dürr Systems GmbH Guiding air ring comprising a ring cavity and corresponding bell plate
CN101583433B (en) * 2006-12-06 2013-02-06 杜尔系统有限责任公司 Guiding air ring comprising a ring cavity and corresponding bell plate
US8827181B2 (en) 2006-12-06 2014-09-09 Durr Systems Gmbh Shaping air ring comprising an annular cavity and corresponding bell cup
WO2009005915A1 (en) * 2007-07-03 2009-01-08 Illinois Tool Works Inc. Spray device having a parabolic flow surface
US8602326B2 (en) 2007-07-03 2013-12-10 David M. Seitz Spray device having a parabolic flow surface
CN101678374B (en) * 2007-07-03 2014-06-11 博兰智涂装控股公司 Spray device having parabolic flow surface
EP2170525B1 (en) * 2007-07-03 2018-05-16 Finishing Brands Holdings Inc. Spray device having a parabolic flow surface
DE102008027997A1 (en) 2008-06-12 2009-12-24 Dürr Systems GmbH Universalzerstäuber
US8881672B2 (en) 2008-06-12 2014-11-11 Duerr Systems, Gmbh Universal atomizer
CN112044611A (en) * 2020-09-22 2020-12-08 党如童 Rainfall type water-saving irrigation spray head

Also Published As

Publication number Publication date
EP1250960A3 (en) 2005-04-13
DE10118741A1 (en) 2002-10-24

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