EP0827781A2 - Rotary sprayer - Google Patents

Rotary sprayer Download PDF

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Publication number
EP0827781A2
EP0827781A2 EP97115078A EP97115078A EP0827781A2 EP 0827781 A2 EP0827781 A2 EP 0827781A2 EP 97115078 A EP97115078 A EP 97115078A EP 97115078 A EP97115078 A EP 97115078A EP 0827781 A2 EP0827781 A2 EP 0827781A2
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EP
European Patent Office
Prior art keywords
bell
cleaning fluid
rotary atomizer
atomizer according
spray
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
EP97115078A
Other languages
German (de)
French (fr)
Other versions
EP0827781B1 (en
EP0827781A3 (en
Inventor
Ralph Rothenbacher
Bettina Zitzelsberger
Steffen Georgi
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ABB Patent GmbH
Original Assignee
ABB Patent GmbH
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
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Publication of EP0827781A2 publication Critical patent/EP0827781A2/en
Publication of EP0827781A3 publication Critical patent/EP0827781A3/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
    • B05B3/1064—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 the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • 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
    • 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
    • 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 rotary atomizer for the application of paints by means of electrostatic internal or external charging with a spray bell an end tear-off edge, with one arranged in a motor housing Drive motor, which housing supply lines for the supply of paint, Cleaning fluid and compressed air and at least one high-voltage connection records.
  • a flushing device for cleaning the bell outer surface is in the DE 195 17 477 A1 has been proposed, which for a spray nozzle Cleaning provided cleaning fluid, preferably solvent, immediately is sprayed onto the outer surface of the bell.
  • cleaning fluid preferably solvent
  • a spray nozzle for cleaning fluid is arranged, which with one in the motor housing facing rear face of the spray bell molded ring groove works together, via which the cleaning fluid to the bell outer surface arrives and removes and removes impurities located there.
  • the sprayed cleaning fluid in the prior art only partially reaches the surface of the spray bell to be cleaned or then spread as a film while the rest is reflected and is not available for cleaning, forms the applied according to the invention Cleaning fluid a covering the entire outer surface of the spray bell Film that removes adhering paint residues due to its reactive properties quasi rinsed off the bell outer surface.
  • the annular groove is at least one radial Provide recess through which the cleaning fluid introduced into the annular groove reaches the outer surface of the bell.
  • the annular groove on at least one on Radial bore arranged at the bottom of the groove with the bell outer surface in terms of flow connected, with six designed as bores or as slots radial or the direction of rotation of the bell following involute or tangential through openings the best effect is achieved.
  • the annular groove is parallel to the outer wall of the bell molded into the back of the bell, the annular groove advantageously being conical Has groove flanks.
  • annular groove at an angle between 10 ° and 30 °, preferably 20 °, inclined in relation to the central axis of the spray bell the back of the bell is molded.
  • the spray nozzle for the cleaning fluid at a short distance from Spray bell arranged.
  • the distance between the spray nozzle is preferably for the cleaning fluid and the back of the spray bell at most 2 mm.
  • Fig. 1 is a rotary atomizer 10 with a drive 12 and with a front Spray bell 14 and arranged concentrically around the drive 12 High-voltage electrodes 16 and one feeding the high-voltage electrodes 16 High voltage connection line 18 shown.
  • the high voltage electrodes 16 are fastened radially to a housing 20 which has a drive 12 forming engine, preferably compressed air turbine engine.
  • a shaft 22 for driving the spray bell 14 is brought out and a spray nozzle 24 for supplying the spray bell 14 with cleaning fluid.
  • annular groove 26 is formed parallel to the outer surface 28 of the spray bell 14, at the bottom of the groove there are recesses 30 which provide a flow connection form to the outer surface 28.
  • the spray nozzle 24 and the annular groove 26 with the recesses 30 form the cleaning device according to the invention for the removal of impurities and color residues on the surface 28 of the spray bell 14.
  • the relevant spray bell 14 is cleaned. Both the inner colorant paths and the front end face cleaned as well as the surface of the spray bell 14, on which Colorant residues and other impurities can accumulate.
  • cleaning fluid for example solvent
  • the spray nozzle 24 possibly enriched with compressed air, supplied and arrives due to the strict geometric assignment of the ring channel 26 to the radial position of the Spray nozzle 24 without loss into the annular groove 26, from where the cleaning fluid due to centrifugal force flows to the base of the groove radially further outside and through the The recesses 30 provided there reach the lateral surface 28.
  • the recesses 30 can be radial bores or slots. You can but also involute-like, i.e. following an involute, or tangential in each case according to the direction of rotation through the existing outer wall be.
  • the cleaning fluid spreads evenly over the circumferential surface and thereby the on the The surface of any accumulated impurities first dissolves and then detaches and leads to one due to the centrifugal flow the end of the spray bell located tear-off edge 29, on which in the paint spraying operation the relevant colorant and in the so-called rinsing mode the relevant one Detergent or cleaning fluid is thrown off.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Abstract

A spraying globe with a front side outline edge has a deck motor arranged in a housing, the housing accommodating supply lines for the coating material, cleaning fluid and compressed air as well as at least one high voltage connector. At the globe front side of the motor housing at least one spray nozzle for cleaning fluid is arranged. The nozzle cooperates with a snap ring groove moulded to the motor housing facing the rear side front side of the spraying globe. The cleaning fluid arrives at the globe outer surface through the groove and loosens and removes contamination. The snap ring groove has a radial recess through which the cleaning fluid brought into the groove arrives at the outer globe surface.

Description

Die Erfindung betrifft einen Rotationszerstäuber für das Auftragen von Anstrichstoffen mittels elektrostatischer Innen- oder Außenaufladung mit einer Sprühglocke mit einer stirnseitigen Abrißkante, mit einem in einem Motorgehäuse angeordneten Antriebsmotor, welches Gehäuse Versorgungsleitungen für die Zufuhr von Anstrichstoff, Reinigungsfluid und Druckluft sowie wenigstens einen Hochspannungsanschluß aufnimmt.The invention relates to a rotary atomizer for the application of paints by means of electrostatic internal or external charging with a spray bell an end tear-off edge, with one arranged in a motor housing Drive motor, which housing supply lines for the supply of paint, Cleaning fluid and compressed air and at least one high-voltage connection records.

Es ist bekannt, daß bei den zum Auftragen von Anstrichstoffen, zum Beispiel von elektrisch leitfähigen wasserlöslichen Lacken, mittels elektrostatischem Beschichten verwendeten Rotationssprühzerstäubern, die mit hoher Drehzahl rotierenden Sprühglocken auf ihrer dem Antriebsmotor zugewandten rückwärtigen Außenfläche verschmutzen, das heißt mit Farbresten und sonstigen Verunreinigungen bedeckt sind.It is known that in the application of paints, for example electrically conductive water-soluble paints, by means of electrostatic coating used rotary spray atomizers that rotate at high speed Spray bells on their rear outer surface facing the drive motor soiling, that is covered with paint residues and other impurities are.

Da solche Verunreinigungen sich nachteilig auf den Betrieb der Sprühvorrichtung sowie auf das hiermit erzielte Arbeitsergebnis auswirken, muß dafür gesorgt werden, daß die Glockenaußenfläche beim bestimmungsgemäßen Farbauftrag stets frei von Verunreinigungen ist.Because such contaminants adversely affect the operation of the sprayer as well as affect the result of work achieved with this, care must be taken that the outer surface of the bell always applies when the paint is used as intended is free of impurities.

Eine Spülvorrichtung zur Reinigung der Glockenaußenfläche ist in der DE 195 17 477 A1 vorgeschlagen worden, wobei durch eine Spritzdüse das zur Reinigung vorgesehene Reinigungsfluid, vorzugsweise Lösungsmittel, unmittelbar auf die Glockenaußenfläche aufgespritzt wird. Dabei hat sich allerdings gezeigt, daß ein nicht unbeträchtlicher Teil des Lösungmittels abprallt und demgemäß nicht zur Reinigung der Glockenaußenfläche zur Verfügung steht, so daß ein erheblicher Verbrauch an entsorgungspflichtigem Reinigungsfluid resultiert.A flushing device for cleaning the bell outer surface is in the DE 195 17 477 A1 has been proposed, which for a spray nozzle Cleaning provided cleaning fluid, preferably solvent, immediately is sprayed onto the outer surface of the bell. However, it has been shown that a not inconsiderable part of the solvent bounces off and accordingly not is available for cleaning the bell outer surface, so that a considerable Consumption of cleaning fluid requiring disposal results.

Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, eine Spülvorrichtung der eingangs genannten Art anzugeben, welche auf konstruktiv einfache Weise einen sparsamen Verbrauch an Reinigungsfluid bei gleichzeitig guter Reinigung der Glockenaußenfläche ermöglicht.Starting from this prior art, it is an object of the invention to provide a rinsing device of the type mentioned at the beginning, which in a structurally simple Way an economical consumption of cleaning fluid with good at the same time Allows cleaning of the bell outer surface.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst. Weitere Vorteilhafte Ausgestaltungen und Verbesserungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by the characterizing features of Claim 1 solved. Further advantageous refinements and improvements the invention are specified in the subclaims.

Demgemäß ist an der glockenseitigen Stirnseite des Motorgehäuses wenigstens eine Sprühdüse für Reinigungsfluid angeordnet, welche mit einer in die dem Motorgehäuse zugewandten rückseitigen Stirnseite der Sprühglocke eingeformten Ringnut zusammenarbeitet, über welche das Reinigungsfluid an die Glockenaußenfläche gelangt und dort befindliche Verunreinigungen ablöst und beseitigt.Accordingly, at least on the bell-side end of the motor housing a spray nozzle for cleaning fluid is arranged, which with one in the motor housing facing rear face of the spray bell molded ring groove works together, via which the cleaning fluid to the bell outer surface arrives and removes and removes impurities located there.

Während, wie zuvor ausgeführt, im Stand der Technik das aufgesprühte Reinigungsfluid nur zum Teil die zu reinigende Oberfläche der Sprühglocke erreicht beziehungsweise darauf als Film sich verteilt, während der Rest reflektiert wird und zur Reinigung nicht zur Verfügung steht, bildet das erfindungsgemäß aufgebrachte Reinigungsfluid einen die gesamte Außenfläche der Sprühglocke bedeckenden Film, der aufgrund seiner reaktiven Eigenschaften anhaftende Farbreste ablöst und quasi von der Glockenaußenfläche abspült.While, as previously stated, the sprayed cleaning fluid in the prior art only partially reaches the surface of the spray bell to be cleaned or then spread as a film while the rest is reflected and is not available for cleaning, forms the applied according to the invention Cleaning fluid a covering the entire outer surface of the spray bell Film that removes adhering paint residues due to its reactive properties quasi rinsed off the bell outer surface.

Gemäß einer Weiterbildung der Erfindung ist die Ringnut mit wenigstens einer radialen Ausnehmung versehen, durch welche das in die Ringnut eingebrachte Reinigungsfluid an die Glockenaußenfläche gelangt. Dabei ist entsprechend einer bevorzugten Ausführungsform der Erfindung die Ringnut über wenigstens eine am Nutgrund angeordnete radiale Bohrung mit der Glockenaußenfläche strömungsmäßig verbunden, wobei mit sechs als Bohrungen oder als Schlitze ausgebildeten radialen oder auch der Drehrichtung der Glocke folgenden evolventenartigen beziehungsweise tangentialen Durchgangsöffnungen die beste Wirkung erzielt wird. According to a development of the invention, the annular groove is at least one radial Provide recess through which the cleaning fluid introduced into the annular groove reaches the outer surface of the bell. Here is a preferred Embodiment of the invention the annular groove on at least one on Radial bore arranged at the bottom of the groove with the bell outer surface in terms of flow connected, with six designed as bores or as slots radial or the direction of rotation of the bell following involute or tangential through openings the best effect is achieved.

Hierdurch wird erreicht, daß das nach außen gelangende Reinigungsfluid sich filmartig auf der Glockenaußenfläche ausbreitet, wobei das auf der Glockenaußenfläche befindliche Reinigungsfluid mitsamt aufgenommener Verunreinigungen an die frontseitige Abrißkante der Sprühglocke strömt und dort fliehkraftbedingt die Sprühglocke verläßt.This ensures that the cleaning fluid escaping to the outside becomes spreads like a film on the outer surface of the bell, this on the outer surface of the bell cleaning fluid with all the contaminants it contains the front tear-off edge of the spray bell flows and there the centrifugal force Spray bell leaves.

In weiterer Ausgestaltung der Erfindung ist die Ringnut parallel zur Glockenaußenwand in die Glockenrückseite eingeformt, wobei vorteilhafterweise die Ringnut konische Nutflanken aufweist.In a further embodiment of the invention, the annular groove is parallel to the outer wall of the bell molded into the back of the bell, the annular groove advantageously being conical Has groove flanks.

Ferner kann es vorteilhaft sein, daß die Ringnut unter einem Winkel zwischen 10° und 30°, vorzugsweise 20°, gegenüber der Mittelachse der Sprühglocke geneigt in die Glockenrückseite eingeformt ist.It may also be advantageous that the annular groove at an angle between 10 ° and 30 °, preferably 20 °, inclined in relation to the central axis of the spray bell the back of the bell is molded.

Um eine einwandfreie Funktion der erfindungsgemäßen Reinigungsvorrichtung sicherzustellen, ist die Spritzdüse für das Reinigungsfluid in geringem Abstand zur Sprühglocke angeordnet. Vorzugsweise beträgt der Abstand zwischen der Spritzdüse für das Reinigungsfluid und der Rückseite der Sprühglocke höchstens 2 mm.In order to ensure that the cleaning device according to the invention functions properly, is the spray nozzle for the cleaning fluid at a short distance from Spray bell arranged. The distance between the spray nozzle is preferably for the cleaning fluid and the back of the spray bell at most 2 mm.

Gemäß einer alternativen, nicht weniger vorteilhaften Alternative kann vorgesehen sein, daß die Spritzdüse für das Reinigungsfluid in die Ringnut eintaucht.According to an alternative, no less advantageous alternative can be provided be that the spray nozzle for the cleaning fluid dips into the annular groove.

In beiden Ausführungsvarianten ist gewährleistet, daß die aus der Spritzdüse austretende Menge an Reinigungsfluid komplett in die Ringnut einströmt und damit für die Oberflächenreinigung zur Verfügung steht.In both variants it is ensured that the one emerging from the spray nozzle Amount of cleaning fluid flows completely into the ring groove and thus for surface cleaning is available.

Diese und weitere vorteilhafte Ausgestaltungen und Verbesserungen der Erfindung sind Gegenstand der Unteransprüche.These and other advantageous refinements and improvements of the invention are the subject of the subclaims.

Anhand eines in der schematischen Zeichnung dargestellten Ausführungsbeispiels sollen die Erfindung, vorteilhafte Ausgestaltungen und Verbesserungen sowie besondere Vorteile der Erfindung näher erläutert und beschrieben werden. Es zeigen:

Fig. 1
eine Seitenansicht eines Rotationszerstäubers mit Elektroden für die Außenaufladung mit einer erfindungsgemäßen Sprühglocke und
Fig. 2
eine erfindungsgemäße Sprühglocke im Längsschnitt mit dem anschließenden Motorgehäuse in Teildarstellung.
The invention, advantageous refinements and improvements and special advantages of the invention are to be explained and described in more detail with reference to an exemplary embodiment shown in the schematic drawing. Show it:
Fig. 1
a side view of a rotary atomizer with electrodes for external charging with a spray bell and
Fig. 2
a spray bell according to the invention in longitudinal section with the subsequent motor housing in partial representation.

In Fig. 1 ist ein Rotationszerstäuber 10 mit einem Antrieb 12 und mit einer frontseitigen Sprühglocke 14 sowie mit konzentrisch um den Antrieb 12 angeordneten Hochspannungselektroden 16 und einer die Hochspannungselektroden 16 speisenden Hochspannungsverbindungsleitung 18 gezeigt. Die Hochspannungselektroden 16 sind radial an einem Gehäuse 20 befestigt, welches einen den Antrieb 12 bildenden Motor, vorzugsweise Druckluft-Turbinenmotor, aufnimmt.In Fig. 1 is a rotary atomizer 10 with a drive 12 and with a front Spray bell 14 and arranged concentrically around the drive 12 High-voltage electrodes 16 and one feeding the high-voltage electrodes 16 High voltage connection line 18 shown. The high voltage electrodes 16 are fastened radially to a housing 20 which has a drive 12 forming engine, preferably compressed air turbine engine.

An der zur Sprühglocke 14 weisenden Stirnseite des Gehäuses 20 ist, wie aus Fig. 2 ersichtlich, eine Welle 22 zum Antrieb der Sprühglocke 14 herausgeführt sowie eine Spritzdüse 24 zur Beaufschlagung der Sprühglocke 14 mit Reinigungsfluid.On the end face of the housing 20 facing the spray bell 14, as shown in FIG. 2, a shaft 22 for driving the spray bell 14 is brought out and a spray nozzle 24 for supplying the spray bell 14 with cleaning fluid.

Erfindungsgemäß ist an der dem Gehäuse 20 zugewandten Rückseite der Sprühglocke 14 eine Ringnut 26 parallel zur Außenfläche 28 der Sprühglocke 14 eingeformt, an deren Nutgrund Ausnehmungen 30 vorgesehen sind, welche eine Strömungsverbindung zur Außenfläche 28 bilden. Die Spritzdüse 24 und die Ringnut 26 mit den Ausnehmungen 30 bilden die erfindungsgemäße Reinigungseinrichtung für die Beseitigung von Verunreinigungen und Farbrückständen auf der Mantelfläche 28 der Sprühglocke 14.According to the invention is on the rear side of the spray bell facing the housing 20 14 an annular groove 26 is formed parallel to the outer surface 28 of the spray bell 14, at the bottom of the groove there are recesses 30 which provide a flow connection form to the outer surface 28. The spray nozzle 24 and the annular groove 26 with the recesses 30 form the cleaning device according to the invention for the removal of impurities and color residues on the surface 28 of the spray bell 14.

Die Wirkungsweise dieser Reinigungseinrichtung wird nachstehend erläutert.The operation of this cleaning device is explained below.

Sobald ein Beschichtungszyklus, zum Beispiel das Lackieren einer Fahrzeugkarosserie, welches ein bevorzugtes Anwendungsgebiet der vorliegenden Erfindung darstellt, abgeschlossen ist, erfolgt die Reinigung der betreffenden Sprühglocke 14. Dabei werden sowohl die innenliegenden Farbmittelwege und die frontseitige Stirnfläche gereinigt als auch die Mantelfäche der Sprühglocke 14, auf welcher sich Farbmittelreste und sonstige Verunreinigungen anlagern können.As soon as a coating cycle, for example painting a vehicle body, which is a preferred field of application of the present invention is completed, the relevant spray bell 14 is cleaned. Both the inner colorant paths and the front end face cleaned as well as the surface of the spray bell 14, on which Colorant residues and other impurities can accumulate.

Hierzu wird über die Spritzdüse 24 Reinigungsfluid, zum Beispiel Lösungmittel, das gegebenenfalls mit Druckluft angereichert ist, zugeführt und gelangt aufgrund der strengen geometrischen Zuordnung des Ringkanals 26 zur radialen Position der Spritzdüse 24 verlustfrei in die Ringnut 26, von wo aus das Reinigungsfluid fliehkraftbedingt zum radial weiter außerhalb befindlichen Nutgrund fließt und durch die dort vorgesehenen Ausnehmungen 30 an die Mantelfläche 28 gelangt.For this purpose, cleaning fluid, for example solvent, is applied via the spray nozzle 24 possibly enriched with compressed air, supplied and arrives due to the strict geometric assignment of the ring channel 26 to the radial position of the Spray nozzle 24 without loss into the annular groove 26, from where the cleaning fluid due to centrifugal force flows to the base of the groove radially further outside and through the The recesses 30 provided there reach the lateral surface 28.

Die Ausnehmungen 30 können radiale Bohrungen oder Schlitze sein. Sie können aber auch evolventenartig, das heißt einer Evolvente folgend, oder tangential jeweils der Drehrichtung entsprechend durch die vorhandene Außenwandung geführt sein.The recesses 30 can be radial bores or slots. You can but also involute-like, i.e. following an involute, or tangential in each case according to the direction of rotation through the existing outer wall be.

Aufgrund dieser Anordnung wird erfindungsgemäß erreicht, daß das Reinigungsfluid sich gleichmäßig über die Mantelfläche ausbreitet und hierbei die auf der Mantelfläche eventuell angelagerten Verunreinigungen zunächst anlöst und dann ablöst und infolge der fliehkraftbedingten Strömung mit sich führt bis zu einer an der Stirnseite der Sprühglocke befindlichen Abrißkante 29, an welcher im Farbsprühbetrieb das betreffende Farbmittel und im sogenannten Spülbetrieb das betreffende Spülmittel beziehungsweise Reinigungsfluid abgeschleudert wird.Because of this arrangement it is achieved according to the invention that the cleaning fluid spreads evenly over the circumferential surface and thereby the on the The surface of any accumulated impurities first dissolves and then detaches and leads to one due to the centrifugal flow the end of the spray bell located tear-off edge 29, on which in the paint spraying operation the relevant colorant and in the so-called rinsing mode the relevant one Detergent or cleaning fluid is thrown off.

Während bei den bisher bekannten Verfahrensweisen zur Reinigung der Außenfläche infolge des direkten strahlförmigen Auftreffens des Reinigungsmittels auf die Glockenaußenfläche Zerstäubungen resultieren, bei denen aufgenommene Farb reste und Verunreinigungen mitgerissen werden, die sich anschließend unkontrolliert, insbesondere bei der Außenaufladung, am Antriebsgehäuse 20 anlagern und so zu Störungen führen können, wird mit Hilfe der erfindungsgemäßen Gestaltung der Sprühglocke 14 zum Zwecke der Außenreinigung der Sprühglocke 14 eine gleichbleibende Säuberung der Außenfläche 28 der Sprühglocke 14 ohne störende Nebeneffekte erreicht.While in the previously known procedures for cleaning the outer surface due to the direct jet impact of the cleaning agent on the Bell outer surface atomizations result in which absorbed paint residues and impurities are entrained, which subsequently become uncontrolled, in particular for external charging, attach to the drive housing 20 and can lead to interference with the design according to the invention the spray bell 14 for the purpose of cleaning the exterior of the spray bell 14 constant cleaning of the outer surface 28 of the spray bell 14 without disruptive Side effects achieved.

Claims (12)

Rotationszerstäuber für das Auftragen von Anstrichstoffen mittels elektrostatischer Innen- oder Außenaufladung mit einer Sprühglocke mit einer stirnseitigen Abrißkante, mit einem in einem Gehäuse angeordneten Antriebsmotor betriebenen, welches Gehäuse Versorgungsleitungen für die Zufuhr von Anstrichstoff, Reinigungsfluid und Druckluft sowie wenigstens einen Hochspannungsanschluß aufnimmt dadurch gekennzeichnet, daß an der glockenseitigen Stirnseite des Motorgehäuses wenigstens eine Sprühdüse für Reinigungsfluid angeordnet ist, welche mit einer in die dem Motorgehäuse zugewandten rückseitigen Stirnseite der Sprühglocke eingeformten Ringnut zusammenarbeitet , über welche das Reinigungsfluid an die Glockenaußenfläche gelangt und dort befindliche Verunreinigungen ablöst und beseitigt.Rotary atomizer for the application of paints by means of electrostatic internal or external charging with a spray bell with an end tear-off edge, operated with a drive motor arranged in a housing, which housing accommodates supply lines for the supply of paint, cleaning fluid and compressed air and at least one high-voltage connection, characterized in that At least one spray nozzle for cleaning fluid is arranged on the bell-side end of the motor housing, which cooperates with an annular groove formed in the rear end of the spray bell facing the motor housing, via which the cleaning fluid reaches the outer surface of the bell and removes and removes contaminants located there. Rotationszerstäuber nach Anspruch 1, dadurch gekennzeichnet, daß die Ringnut mit wenigstens einer radialen Ausnehmung versehen ist, durch welche das in die Ringnut eingebrachte Reinigungsfluid an die Glockenaußenfläche gelangt.Rotary atomizer according to claim 1, characterized in that the Ring groove is provided with at least one radial recess through which the in the cleaning fluid introduced into the annular groove reaches the outer surface of the bell. Rotationszerstäuber nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Ringnut über wenigstens eine am Nutgrund angeordnete radiale Bohrung mit der Glockenaußenfläche strömungsmäßig verbunden ist.Rotary atomizer according to claim 1 or 2, characterized in that the annular groove with at least one radial bore arranged on the groove base Bell outer surface is fluidly connected. Rotationszerstäuber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß sechs als Bohrungen oder als Schlitze ausgebildete radiale Ausnehmungen den Ringkanal mit der Glockenaußenfläche strömungsmäßig verbinden.Rotary atomizer according to one of the preceding claims, characterized in that that six radial recesses designed as bores or as slots fluidly connect the ring channel with the outer surface of the bell. Rotationszerstäuber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Ringnut parallel zur Glockenaußenfläche in die Glockenrückseite eingeformt ist.Rotary atomizer according to one of the preceding claims, characterized in that that the ring groove parallel to the outer surface of the bell in the back of the bell is molded. Rotationszerstäuber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß der Abstand zwischen der Spritzdüse für das Reinigungsfluid und der Rückseite der Sprühglocke höchstens 2 mm beträgt. Rotary atomizer according to one of the preceding claims, characterized in that that the distance between the spray nozzle for the cleaning fluid and the rear of the spray bell is at most 2 mm. Rotationszerstäuber nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Spritzdüse für das Reinigungsfluid in die Ringnut eintaucht.Rotary atomizer according to one of claims 1 to 5, characterized in that that the spray nozzle for the cleaning fluid is immersed in the annular groove. Rotationszerstäuber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die aus der Spritzdüse austretende Menge an Reinigungsfluid komplett in die Ringnut einströmt.Rotary atomizer according to one of the preceding claims, characterized in that that the amount of cleaning fluid emerging from the spray nozzle flows completely into the ring groove. Rotationszerstäuber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das aus der Ringnut durch die wenigstens eine radiale Ausnehmung nach außen gelangende Reinigungsfluid sich filmartig auf der Glockenaußenfläche ausbreitet.Rotary atomizer according to one of the preceding claims, characterized in that that that from the annular groove through the at least one radial recess cleaning fluid escaping to the outside is film-like on the outer surface of the bell spreads. Rotationszerstäuber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das auf der Glockenaußenfläche befindliche Reinigungsfluid mitsamt aufgenommener Verunreinigungen an die Abrißkante strömt und dort fliehkraftbedingt die Sprühglocke verläßt.Rotary atomizer according to one of the preceding claims, characterized in that that the cleaning fluid located on the outer surface of the bell together with Contaminated dirt flows to the tear-off edge and there due to centrifugal force the spray bell leaves. Rotationszerstäuber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Ringnut konische Nutflanken aufweist.Rotary atomizer according to one of the preceding claims, characterized in that that the annular groove has conical groove flanks. Rotationszerstäuber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Ringnut unter einem Winkel zwischen 10° und 30°, vorzugsweise 20°, gegenüber der Mittelachse der Sprühglocke geneigt in die Glockenrückseite eingeformt ist.Rotary atomizer according to one of the preceding claims, characterized in that that the annular groove at an angle between 10 ° and 30 °, preferably 20 °, inclined in relation to the central axis of the spray bell in the rear of the bell is molded.
EP97115078A 1996-09-06 1997-09-01 Rotary sprayer Expired - Lifetime EP0827781B1 (en)

Applications Claiming Priority (2)

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DE19636159A DE19636159A1 (en) 1996-09-06 1996-09-06 Rotary atomizer
DE19636159 1996-09-06

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EP0827781A2 true EP0827781A2 (en) 1998-03-11
EP0827781A3 EP0827781A3 (en) 1998-09-16
EP0827781B1 EP0827781B1 (en) 2002-11-06

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EP1222967A3 (en) * 2001-01-13 2003-11-12 ITW Oberflächentechnik GmbH & Co.KG Method and apparatus for spraying a coating liquid
EP1222965A3 (en) * 2001-01-13 2003-11-12 ITW Oberflächentechnik GmbH & Co.KG Method and apparatus for spraying a coating liquid
US6915963B2 (en) 2001-01-13 2005-07-12 Itw Oberflachentechnik Gmbh & Co. Kg Spraying method and a spray system for coating liquids

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DE50211626D1 (en) 2001-02-24 2008-03-13 Marquardt Gmbh DEVICE FOR TURNING ANGLE ADJUSTMENT

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DE3912700C1 (en) * 1989-04-18 1990-10-11 Ransburg-Gema Gmbh, 6056 Heusenstamm, De Rotary spray coater - has atomiser ring with solvent channels, and includes annular air inlets
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DE19517477A1 (en) 1995-05-12 1996-11-14 Abb Patent Gmbh Air-turbine-driven rotary atomiser with built-in rinsing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1222967A3 (en) * 2001-01-13 2003-11-12 ITW Oberflächentechnik GmbH & Co.KG Method and apparatus for spraying a coating liquid
EP1222965A3 (en) * 2001-01-13 2003-11-12 ITW Oberflächentechnik GmbH & Co.KG Method and apparatus for spraying a coating liquid
US6857581B2 (en) 2001-01-13 2005-02-22 Itw Oberflachentechnik Gmbh & Co. Kg Spraying method and a spray system for coating liquids
US6915963B2 (en) 2001-01-13 2005-07-12 Itw Oberflachentechnik Gmbh & Co. Kg Spraying method and a spray system for coating liquids

Also Published As

Publication number Publication date
DE19636159A1 (en) 1998-03-12
DE59708656D1 (en) 2002-12-12
EP0827781B1 (en) 2002-11-06
EP0827781A3 (en) 1998-09-16

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