EP0054820B1 - Apparatus for the supply of fluid to a rotating hollow body - Google Patents

Apparatus for the supply of fluid to a rotating hollow body Download PDF

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Publication number
EP0054820B1
EP0054820B1 EP81110210A EP81110210A EP0054820B1 EP 0054820 B1 EP0054820 B1 EP 0054820B1 EP 81110210 A EP81110210 A EP 81110210A EP 81110210 A EP81110210 A EP 81110210A EP 0054820 B1 EP0054820 B1 EP 0054820B1
Authority
EP
European Patent Office
Prior art keywords
fluid
cone
spray bell
hollow
bell
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
Application number
EP81110210A
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German (de)
French (fr)
Other versions
EP0054820A1 (en
EP0054820B2 (en
Inventor
Roland Dipl.-Ing. Meisner
Hagen Dr. Dipl.-Ing. Buchholz
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.)
BASF Farben und Fasern AG
Original Assignee
BASF Farben und Fasern AG
BASF Lacke und Farben AG
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Application filed by BASF Farben und Fasern AG, BASF Lacke und Farben AG filed Critical BASF Farben und Fasern AG
Priority to AT81110210T priority Critical patent/ATE10444T1/en
Publication of EP0054820A1 publication Critical patent/EP0054820A1/en
Publication of EP0054820B1 publication Critical patent/EP0054820B1/en
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Publication of EP0054820B2 publication Critical patent/EP0054820B2/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
    • 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 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
    • 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
    • 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 method for feeding a fluid, e.g. B. a liquid coating agent from a fixed feed part in the form of a cone-shaped liquid lamella on the inner contour of a rotating hollow body, for. B. a spray bell, the fluid accelerating there and being led to the edge of the spray bell.
  • a fluid e.g. B. a liquid coating agent from a fixed feed part in the form of a cone-shaped liquid lamella on the inner contour of a rotating hollow body, for. B. a spray bell, the fluid accelerating there and being led to the edge of the spray bell.
  • a device suitable for carrying out the method according to the preamble is described in FR-A-1 300 555.
  • the axis of rotation of the spray bell is designed as a hollow shaft which only partially protrudes into the spray bell and through which the fluid is sprayed centrally through a nozzle onto a baffle plate system, which is intended to bring about the homogeneous distribution of the fluid over the inner contour of the spray bell .
  • the impact body leads to the fact that air laden with fluid can hit the top of the impact body through backflow within the spray bell, here leads to deposits which can then lead to irregularities and air inclusions in the lacquer layer to be applied.
  • the invention has for its object to improve the procedure according to the preamble of the main claim to ensure that the fluid does not fill the cavity of the spray bell, but is homogeneously distributed on the inner surface of the spray bell and that at the transfer point from the fluid to the There are no parts on the inside of the spray bell which are not constantly washed and washed over by the fluid flow, so that when the fluid is changed an automatic cleaning takes place.
  • This object of the invention is achieved in that the fluid in the fixed part is given a swirl flow which creates the cone-shaped liquid lamella in and after leaving the fixed part in the fluid, which is guided into a conical transfer surface of the spray bell.
  • the invention further relates to a device for feeding a fluid with a spray bell, into which a fluid is introduced centrally in the form of a cone-shaped lamella and which is provided at the rear with a cylindrical end part.
  • the device according to the invention is characterized by a fixed hollow cone nozzle for producing the cone-shaped liquid lamella and a truncated cone-shaped transfer surface in the circumferential spray bell, which is located at a distance from the mouth of the hollow cone nozzle, the truncated cone-shaped transfer surface tapering towards the hollow cone nozzle.
  • the solution according to the invention thus consists in that the hollow body, ie. H. the spray bell, the liquid, d. H. the fluid is transferred centrally to the axis of rotation using a hollow cone-shaped lamella.
  • the hollow-cone-shaped lamella is produced by a swirl flow that is suddenly no longer guided, which, before it disintegrates into drops after a determinable distance, from the inner contour of the rotating hollow body, ie. H. the spray bell and the hollow-cone-shaped transfer surface provided therein is detected and taken over.
  • the cone-shaped liquid lamella and thus the transfer point is so stable that all wetted points are constantly overflowed.
  • the cone-shaped liquid lamella which is transferred uniformly and rotationally symmetrically to the hollow cone inner contour, is accelerated by the latter and is conveyed away from the feed point by the centrifugal forces that arise.
  • the acceleration can be achieved by friction or by normal forces that act on the lamella, which is broken down into liquid threads.
  • the drawing shows at 1 a spray bell, which has a bell-shaped, rotationally symmetrical hollow body 2 and a cylindrical end part 3, this spray bell being driven at a rotational speed of 30,000 to 40,000 rpm.
  • the cylindrical end part 3 of the spray bell 1 is hollow and a hollow cone nozzle 5 is arranged in the cavity thus created, designated 4 in the drawing, which is designed to be stationary and serves to supply the fluid to be sprayed.
  • the transition from bell-shaped part 2 to cavity 4 through the wall of the spray bell takes place via a truncated cone-shaped transfer surface 6, in which grooves 9 are arranged, which are distributed uniformly over the jacket in the cone axis direction and diverge uniformly in relation to the growing cone jacket circumference.
  • the mouth of the truncated cone-shaped transfer surface 6 is at a distance from the mouth of the hollow cone nozzle 5.
  • a radially crossing the wall of the cylindrical part bore is designated, which generates a negative pressure in the circulation of the spray bell 1 in the space 4 by connecting the interior with the environment.
  • an air supply opening opening into the room 4 can be seen, which is designed as an annular gap nozzle 8 and is equipped with control devices, not shown in the drawing, by which a regulated supply of air into the room 4 is possible, so that the vacuum in the room is thereby set becomes possible.
  • the frustoconical transfer surface 6 is provided with the grooves 9, into which the liquid lamella is inserted and thus distributed itself into individual current threads.
  • the acceleration force now acts as a normal force on these current threads, so that slip-free acceleration of the liquid is ensured.
  • the individual current threads leave the truncated-cone-shaped transfer surface 6 in order to then be evenly distributed in the inner contour of the hollow body 2 and to load this inner surface.
  • the transfer point of the fluid in the frustoconical transfer surface 6 is determined by the line L.
  • This line L is spatially lower in the transfer area than the line S, which represents the transfer point of the detergent.
  • the angles of the cone-shaped liquid lamella are determined by the special fluid parameters.
  • the cone angle can also be changed by controlling the pressure on the back of the cone-shaped lamella. This is achieved in that air is continuously pumped out of the half space 4 surrounding the outside of the cone-shaped liquid lamella formed via the bore 7.
  • the outside pressure of the cone-shaped liquid lamella can be defined by metering the supply air via the annular gap nozzle 8.
  • the internal pressure of this cone-shaped liquid lamella has atmospheric pressure, and this makes it possible to regulate the cone angle.

Landscapes

  • Nozzles (AREA)
  • External Artificial Organs (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Tea And Coffee (AREA)
  • Joints Allowing Movement (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

The invention relates to a process and a device for transferring a liquid from a stationary feeding component onto a working part which is rotationally driven, for example a spraying-bell, by generating a thin sheet of liquid in the shape of a conical shell, which is stable over a distance of travel which can be defined, it being possible to define the apex angle of this shell in terms of the functional parameters of the liquid, so that it is possible to select different impact positions of the thin sheet of liquid on the transfer portion of the spraying-bell, depending on the particular liquid in question.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Aufgabe eines Fluids, z. B. eines flüssigen Überzugmittels von einem feststehenden Zuführungsteil in Form einer kegelmantelförmigen Flüssigkeitslamelle auf die Innenkontur eines sich drehenden Hohlkörpers, z. B. einer Sprühglocke, wobei das Fluid dort beschleunigt und zum Rand der Sprühglocke geführt wird.The invention relates to a method for feeding a fluid, e.g. B. a liquid coating agent from a fixed feed part in the form of a cone-shaped liquid lamella on the inner contour of a rotating hollow body, for. B. a spray bell, the fluid accelerating there and being led to the edge of the spray bell.

Eine zur Durchführung des Verfahrens gemäß dem Oberbegriff geeignete Vorrichtung wird in der FR-A-1 300 555 beschrieben. Bei dieser bekannten Einrichtung ist die Drehachse der Sprühglocke als Hohlwelle ausgebildet, die nur teilweise in die Sprühglocke hineinragt und durch die zentrisch zur Drallachse das Fluid über eine Düse auf ein Prallplattensystem aufgespritzt wird, das die homogene Verteilung des Fluids auf die Innenkontur der Sprühglocke bewirken soll. Der Prallkörper führt dazu, daß durch Rückströmung innerhalb der Sprühglocke mit Fluid beladene Luft die Oberseite des Prallkörpers treffen kann, hier zu Ablagerungen führt, die dann zu Unregelmäßigkeiten und zu Lufteinschlüssen in der aufzubringenden Lackschicht führen können.A device suitable for carrying out the method according to the preamble is described in FR-A-1 300 555. In this known device, the axis of rotation of the spray bell is designed as a hollow shaft which only partially protrudes into the spray bell and through which the fluid is sprayed centrally through a nozzle onto a baffle plate system, which is intended to bring about the homogeneous distribution of the fluid over the inner contour of the spray bell . The impact body leads to the fact that air laden with fluid can hit the top of the impact body through backflow within the spray bell, here leads to deposits which can then lead to irregularities and air inclusions in the lacquer layer to be applied.

. In der Praxis ist es weiterhin bekannt, das Fluid mit Hilfe eines Rohres exzentrisch zur Drehachse der Sprühglocke in die Sprühglocke einzubringen und von dort auf die Innenkontur radial oder tangentia! aufzuspritzen. Bei einer solchen Einrichtung ist nicht sichergestellt, daß alle vom Fluid benetzten Flächen auch permanent vom Fluid überströmt werden und so eine selbsttätige Reinigung erfolgen kann.. In practice it is also known to introduce the fluid into the spray bell eccentrically to the axis of rotation of the spray bell using a tube and from there radially or tangentia onto the inner contour! spray on. With such a device, it is not ensured that all surfaces wetted by the fluid are also permanently flowed over by the fluid and so that an automatic cleaning can take place.

Der Erfindung liegt die Aufgabe zugrunde, die Verfahrensweise gemäß dem Oberbegriff des Hauptanspruches dahingehend zu verbessern, daß sichergestellt wird, daß das Fluid den Hohlraum der Sprühglocke nicht ausfüllt, sondern homogen auf der Innenfläche der Sprühglocke verteilt wird und daß an der Übergabestelle vom Fluid auf die Innenseite der Sprühglocke keine Teile vorhanden sind, die durch den Fluidstrom nicht ständig um- und überspült werden, so daß beim Wechsel des Fluids eine selbsttätige Reinigung erfolgt.The invention has for its object to improve the procedure according to the preamble of the main claim to ensure that the fluid does not fill the cavity of the spray bell, but is homogeneously distributed on the inner surface of the spray bell and that at the transfer point from the fluid to the There are no parts on the inside of the spray bell which are not constantly washed and washed over by the fluid flow, so that when the fluid is changed an automatic cleaning takes place.

Diese der Erfindung zugrundeliegende Aufgabe wird dadurch gelöst, daß dem Fluid in dem feststehenden Teil eine Drallströmung erteilt wird, die in dem Fluid bei und nach Verlassen des feststehenden Teiles die kegelmantelförmige Flüssigkeitslamelle schafft, die in eine konische Übergabefläche der Sprühglocke geführt wird.This object of the invention is achieved in that the fluid in the fixed part is given a swirl flow which creates the cone-shaped liquid lamella in and after leaving the fixed part in the fluid, which is guided into a conical transfer surface of the spray bell.

Die Erfindung bezieht sich weiterhin auf eine Vorrichtung zur Aufgabe eines Fluids mit einer Sprühglocke, in die zentrisch ein Fluid in Form einer kegelmantelförmigen Lamelle eingeführt wird und die rückwärtig mit einem zylindrischen Endteil versehen ist. Die erfindungsgemäße Vorrichtung kennzeichnet sich durch eine feststehende Hohlkegeldüse zur Erzeugung der kegelmantelförmigen Flüssigkeitslamelle und eine der Mündung der Hohlkegeldüse im Abstand gegenüberliegende hohlkegelstumpfförmige Übergabefläche in der umlaufenden Sprühglocke, wobei sich die hohlkegelstumpfförmige Übergabefläche zur Hohlkegeldüse hin verjüngt.The invention further relates to a device for feeding a fluid with a spray bell, into which a fluid is introduced centrally in the form of a cone-shaped lamella and which is provided at the rear with a cylindrical end part. The device according to the invention is characterized by a fixed hollow cone nozzle for producing the cone-shaped liquid lamella and a truncated cone-shaped transfer surface in the circumferential spray bell, which is located at a distance from the mouth of the hollow cone nozzle, the truncated cone-shaped transfer surface tapering towards the hollow cone nozzle.

Vorteilhafte Ausgestaltungen einer solchen Vorrichtung sind in den Unteransprüchen definiert.Advantageous configurations of such a device are defined in the subclaims.

Die erfindungsgemäße Lösung besteht somit darin, daß dem Hohlkörper, d. h. also der Sprühglocke, die Flüssigkeit, d. h. das Fluid, mit Hilfe einer hohlkegelmantelförmigen Lamelle zentrisch zur Drehachse übergeben wird. Die hohlkegelmantelförmige Lamelle wird durch eine plötzlich nicht mehr geführte Drallströmung erzeugt, die, bevor sie nach einer bestimmbaren Wegstrecke in Tropfen zerfällt, von der Innenkontur des sich drehenden Hohlkörpers, d. h. der Sprühglocke und der darin vorgesehenen hohlkegelstumpfförmigen Übergabefläche erfaßt und übernommen wird. Die kegelmantelförmige Flüssigkeitslamelle und damit die Übergabestelle ist so stabil, daß alle benetzten Stellen ständig überströmt werden. Beim Wechsel von einer Flüssigkeit auf eine andere, die, da sie aus vorbestimmten Gründen unverträglich miteinander sind, sich nicht vermischen dürfen, wird eine spezielle und spezifisch leichtere Reinigungsflüssigkeit eingesetzt oder der Druckgradient an der Lamelle geändert, so daß dadurch die Auftreffstelle der kegelmantelförmigen Flüssigkeitslamelle geändert wird. Die dabei entstehende kegelmantelförmige Flüssigkeitslamelle hat einen größeren Öffnungswinkel und überstreicht somit dann auch Zonen, die von der vorhergehenden Flüssigkeitslamelle nicht benetzt wurden, so daß immer sichergestellt wird, daß auch die Übergangsstellen einwandfrei z. B. gereinigt werden können.The solution according to the invention thus consists in that the hollow body, ie. H. the spray bell, the liquid, d. H. the fluid is transferred centrally to the axis of rotation using a hollow cone-shaped lamella. The hollow-cone-shaped lamella is produced by a swirl flow that is suddenly no longer guided, which, before it disintegrates into drops after a determinable distance, from the inner contour of the rotating hollow body, ie. H. the spray bell and the hollow-cone-shaped transfer surface provided therein is detected and taken over. The cone-shaped liquid lamella and thus the transfer point is so stable that all wetted points are constantly overflowed. When changing from one liquid to another, which, because they are incompatible with one another for predetermined reasons, must not mix, a special and specifically lighter cleaning liquid is used or the pressure gradient on the lamella is changed, so that this changes the point of contact of the cone-shaped liquid lamella becomes. The resulting cone-shaped liquid lamella has a larger opening angle and thus then also sweeps over zones that have not been wetted by the previous liquid lamella, so that it is always ensured that the transition points are also perfectly z. B. can be cleaned.

Die gleichmäßig und rotationssymmetrisch der Hohlkegelinnenkontur übergebene kegelmantelförmige Flüssigkeitslamelle wird von dieser beschleunigt und über die dabei entstehenden Fliehkräfte von der Aufgabestelle weggefördert. Die Beschleunigung kann dabei durch Reibung oder durch Normalkräfte, die auf die in Flüssigkeitsfäden zerlegte Lamelle wirken, erreicht werden.The cone-shaped liquid lamella, which is transferred uniformly and rotationally symmetrically to the hollow cone inner contour, is accelerated by the latter and is conveyed away from the feed point by the centrifugal forces that arise. The acceleration can be achieved by friction or by normal forces that act on the lamella, which is broken down into liquid threads.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung erläutert.An embodiment of the invention is explained below with reference to the drawing.

Die Zeichnung zeigt bei 1 eine Sprühglocke, die einen glockenförmigen rotationssymetrischen Hohlkörper 2 aufweist sowie ein zylindrisches Endteil 3, wobei diese Sprühglocke mit einer Umlaufgeschwindigkeit von 30000 bis 40000 Upm angetrieben wird.The drawing shows at 1 a spray bell, which has a bell-shaped, rotationally symmetrical hollow body 2 and a cylindrical end part 3, this spray bell being driven at a rotational speed of 30,000 to 40,000 rpm.

Der zylindrische Endteil 3 der Sprühglocke 1 ist hohl ausgebildet und in dem so geschaffenen, in der Zeichnung mit 4 bezeichneten Hohlraum ist eine Hohlkegeldüse 5 angeordnet, die feststehend ausgebildet ist und der Zuführung des zu versprühenden Fluids dient. Der Übergang vom glockenförmigen Teil 2 zum Hohlraum 4 durch die Wandung der Sprühglocke erfolgt über eine hohlkegelstumpfförmige Übergabefläche 6, in der Rillen 9 angeordnet sind, die über den Mantel gleichmäßig verteilt in Kegelachsrichtung verlaufen und im Verhältnis zum wachsenden Kegelmantelumfang gleichförmig divergieren. Die Mündung der höhlkegelstumpfförmigen Übergabefläche 6 liegt im Abstand von der Mündung der Hohlkegeldüse 5.The cylindrical end part 3 of the spray bell 1 is hollow and a hollow cone nozzle 5 is arranged in the cavity thus created, designated 4 in the drawing, which is designed to be stationary and serves to supply the fluid to be sprayed. The transition from bell-shaped part 2 to cavity 4 through the wall of the spray bell takes place via a truncated cone-shaped transfer surface 6, in which grooves 9 are arranged, which are distributed uniformly over the jacket in the cone axis direction and diverge uniformly in relation to the growing cone jacket circumference. The mouth of the truncated cone-shaped transfer surface 6 is at a distance from the mouth of the hollow cone nozzle 5.

Bei 7 ist eine die Wandung des zylindrischen Teiles radial durchquerende Bohrung bezeichnet, die bei dem Umlauf der Sprühglocke 1 in dem Raum 4 einen Unterdruck erzeugt, indem sie den Innenraum mit der Umgebung verbindet.At 7, a radially crossing the wall of the cylindrical part bore is designated, which generates a negative pressure in the circulation of the spray bell 1 in the space 4 by connecting the interior with the environment.

Gleichzeitig ist eine in den Raum 4 mündende Luftzuführungsöffnung erkennbar, die als Ringspaltdüse 8 ausgebildet und mit in der Zeichnung nicht dargestellten Regeleinrichtungen ausgerüstet ist, durch die eine regulierte Zuführung von Luft in den Raum 4 möglich wird, so daß dadurch die Einstellung des Unterdruckes in Raum möglich wird.At the same time, an air supply opening opening into the room 4 can be seen, which is designed as an annular gap nozzle 8 and is equipped with control devices, not shown in the drawing, by which a regulated supply of air into the room 4 is possible, so that the vacuum in the room is thereby set becomes possible.

Bei 10 ist eine Abdichtung der Hohlkegeldüse 5 gegenüber dem Zuleitungsrohr erkennbar.At 10 a seal of the hollow cone nozzle 5 with respect to the feed pipe can be seen.

Die Wirkungsweise der Einrichtung ist wie folgt :

  • In der Hohlkegeldüse 5 wird der Flüssigkeit, beispielsweise einem Lack, ein Drall aufgeprägt, der an der Kante der Hohlkegeldüse 5 plötzlich nicht mehr geführt wird, so daß das Fluid in eine kegelmantelförmige Lamelle aufgespalten wird. Diese kegelmantelförmige Flüssigkeitslamelle besitzt eine Geschwindigkeitskomponente in axialer Richtung, und zwar derart, daß sie sich in den drehenden Hohlkörper, d. h. die hohlkegelstumpfförmige Übergabefläche 6, hineinbewegt. Die Übergabefläche des rotierenden Hohlkörpers ist so gestaltet, daß sie die kegelmantelförmige Flüssigkeitslamelle ohne wesentliche Unstetigkeitstelle übernimmt.
The mechanism works as follows:
  • In the hollow cone nozzle 5, a swirl is applied to the liquid, for example a lacquer, which is suddenly no longer guided at the edge of the hollow cone nozzle 5, so that the fluid is split into a cone-shaped lamella. This cone-shaped liquid lamella has a speed component in the axial direction, in such a way that it moves into the rotating hollow body, ie the frustoconical transfer surface 6. The transfer surface of the rotating hollow body is designed so that it takes over the cone-shaped liquid lamella without any significant discontinuity.

Um die kegelmantelförmige Flüssigkeitslamelle nun nicht nur über ihre Flüssigkeitsreibung auf die Drehzahl beschleunigen zu müssen, ist die hohlkegelstumpfförmige Übergabefläche 6 mit den Rillen 9 versehen, in die die Flüssigkeitslamelle eingelegt wird und damit sich selbst in einzelne Stromfäden verteilt. Auf diese Stromfäden wirkt nun die Beschleunigungskraft als Normalkraft, so daß eine schlupffreie Beschleunigung der Flüssigkeit sichergestellt ist. An der Kante 11 verlassen die einzelnen Stromfäden die hohlkegelstumpfförmige Übergabefläche 6, um dann in der Innenkontur des Hohlkörpers 2 gleichmäßig verteilt zu werden und diese Innenfläche zu beladen.In order not only to have to accelerate the cone-shaped liquid lamella to the speed via its liquid friction, the frustoconical transfer surface 6 is provided with the grooves 9, into which the liquid lamella is inserted and thus distributed itself into individual current threads. The acceleration force now acts as a normal force on these current threads, so that slip-free acceleration of the liquid is ensured. At the edge 11, the individual current threads leave the truncated-cone-shaped transfer surface 6 in order to then be evenly distributed in the inner contour of the hollow body 2 and to load this inner surface.

Aus der Zeichnung ist zu ersehen, daß die Übergabestelle des Fluids in der hohlkegelstumpfförmigen Übergabefläche 6 durch die Linie L bestimmt wird. Diese Linie L liegt räumlich tiefer in der Übergabefläche als die Linie S, die die Übergabestelle des Spülmittels darstellt. Die Winkel der kegelmantelförmigen Flüssigkeitslamelle werden durch die speziellen Fluidparameter bestimmt.From the drawing it can be seen that the transfer point of the fluid in the frustoconical transfer surface 6 is determined by the line L. This line L is spatially lower in the transfer area than the line S, which represents the transfer point of the detergent. The angles of the cone-shaped liquid lamella are determined by the special fluid parameters.

Wenn diese Möglichkeit jedoch zu einer sicheren Trennung der beiden Auftreffstellen nicht ausreicht, so läßt sich der Kegelwinkel auch durch die Steuerung des Druckes auf der Rückseite der kegelmantelförmigen Lamelle verändern. Dies wird dadurch erreicht, daß über die Bohrung 7 ständig aus dem die Außenseite der gebildeten kegelmantelförmigen Flüssigkeitslamelle umgebenden Halbraum 4 Luft abgepumpt wird. Über eine Dosierung der Zuluft über die Ringspaltdüse 8 läßt sich der Außendruck der kegelmantelförmigen Flüssigkeitslamelle definieren. Der Innendruck dieser kegelmantelförmigen Flüssigkeitslamelle besitzt Atmosphärendruck, und hierdurch ist die Einregelung des Kegelwinkels möglich.However, if this possibility is not sufficient for a safe separation of the two impact points, the cone angle can also be changed by controlling the pressure on the back of the cone-shaped lamella. This is achieved in that air is continuously pumped out of the half space 4 surrounding the outside of the cone-shaped liquid lamella formed via the bore 7. The outside pressure of the cone-shaped liquid lamella can be defined by metering the supply air via the annular gap nozzle 8. The internal pressure of this cone-shaped liquid lamella has atmospheric pressure, and this makes it possible to regulate the cone angle.

Claims (9)

1. Process for dispensing a fluid, for example a fluid coating agent, in the shape of a conical envelope of fluid from a fixed feed portion onto the inner contour of a rotating hollow body, for example a spray bell, where the fluid is accelerated and passed towards the edge of the spray bell, characterised in that, in the fixed portion, rotational flow is conferred on the fluid and, as the fluid leaves the fixed portion, creates the conical envelope in this fluid which is passed to a conical transfer surface on the spray bell.
2. Process according to Claim 1, characterised in that-a variable vacuum can be applied to the outer surface of the conical envelope of fluid, while the inner surface of the conical envelope of fluid is under substantially atmospheric pressure.
3. Process according to Claims 1 and 2, characterised in that the fluid which generates the conical envelope of fluid is passed into a hollow cone nozzle under adjustable pressure.
4. Device for dispensing a fluid by means of a spray bell (1) into the centre of which a fluid is introduced in the shape of a conical envelope and which has at the rear a cylindrical end portion (3), characterised by a fixed hollow cone nozzle (5) for generating the conical envelope of fluid and a hollow truncated cone transfer surface (6) which is inside the rotating spray bell (1) and opposite, and a distance away from, the mouth of the hollow cone nozzle (5) and which is tapered towards the hollow cone nozzle (5).
5. Device according to Claim 4, characterised in that the hollow cone nozzle (5) is arranged in the cylindrical end portion (3), and the hollow truncated cone transfer surface (6) takes shape between the conical spray bell portion (2) and the cylindrical portion (3).
6. Device according to one or more of the preceding claims, characterised in that channels (9) have been machined into the inner face of the hollow truncated cone transfer surface (6) in such a way that they are evenly distributed over the shell, extend in the axial direction of the cone, and are uniformly divergent in proportion to the increasing circumference of the surface of the cone.
7. Device according to one or more of the preceding claims, characterised by one or more radial bores (7) arranged in the cylindrical end portion (3) of the spray bell (1) and connecting the inside space with the outside.
8. Device according to one or more of the preceding claims characterised by air admittance openings (annular nozzle (8)) to the inside space (4) of the cylindrical portion (3) of the spray bell (1) and means for controlling the pressure of the air admitted through these air admittance openings.
9. Device according to one or more of the preceding claims, characterised in that the rotational speed of the spray bell (1) is 15,000 r.p.m. or higher.
EP81110210A 1980-12-18 1981-12-07 Apparatus for the supply of fluid to a rotating hollow body Expired EP0054820B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81110210T ATE10444T1 (en) 1980-12-18 1981-12-07 METHOD AND DEVICE FOR ADJUSTING A FLUID TO A ROTATING HOLLOW BODY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3047670 1980-12-18
DE3047670A DE3047670C2 (en) 1980-12-18 1980-12-18 "Method and device for applying a fluid to a rotating hollow body"

Publications (3)

Publication Number Publication Date
EP0054820A1 EP0054820A1 (en) 1982-06-30
EP0054820B1 true EP0054820B1 (en) 1984-11-28
EP0054820B2 EP0054820B2 (en) 1989-06-28

Family

ID=6119446

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81110210A Expired EP0054820B2 (en) 1980-12-18 1981-12-07 Apparatus for the supply of fluid to a rotating hollow body

Country Status (10)

Country Link
US (1) US4429833A (en)
EP (1) EP0054820B2 (en)
JP (1) JPS57140661A (en)
AT (2) ATE10444T1 (en)
BR (1) BR8108211A (en)
DE (2) DE3047670C2 (en)
DK (1) DK149504C (en)
ES (1) ES508160A0 (en)
MX (1) MX155218A (en)
ZA (1) ZA818572B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4927081A (en) * 1988-09-23 1990-05-22 Graco Inc. Rotary atomizer
US5078321A (en) * 1990-06-22 1992-01-07 Nordson Corporation Rotary atomizer cup
US6152382A (en) * 1999-01-14 2000-11-28 Pun; John Y. Modular spray unit and method for controlled droplet atomization and controlled projection of droplets
DE102006022057B3 (en) * 2006-05-11 2007-10-31 Dürr Systems GmbH Rotary atomizer`s application unit for use in varnishing machine, has surface layer, on which thin coating medium with specific film thickness is formed, where layer reduces boundary surface friction between medium and overflow surface
WO2014052348A2 (en) * 2012-09-28 2014-04-03 Agco Corporation Horizontally rotating controlled droplet application
CN105834019B (en) * 2016-05-24 2018-06-19 湖南农业大学 Hydraulic type high pressure water static nozzle

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2161016A (en) 1936-06-11 1939-06-06 Clifford H Carr Spray nozzle
US2728606A (en) 1954-05-24 1955-12-27 Ransburg Electro Coating Corp Liquid feeding apparatus
US2922584A (en) * 1956-11-19 1960-01-26 Ford Motor Co Dual spray painting
FR1300555A (en) * 1959-12-08 1962-08-03 Interplanetary Res & Dev Corp Method and apparatus for applying spray coatings
NL269353A (en) 1959-12-08 1900-01-01
BE634983A (en) * 1962-07-17
DE1240764B (en) * 1963-03-15 1967-05-18 Mueller Ernst Fa Process for the electrostatic coating of objects with paint and a device for carrying out the process
DE2659428C2 (en) * 1976-12-29 1981-11-19 Ransburg Gmbh, 6056 Heusenstamm Device for the electrostatic spraying of liquid coating material to be applied to workpieces
AU517923B2 (en) * 1977-02-07 1981-09-03 Ransburg Japan Ltd. Rotary paint atomizing device
JPS5829150B2 (en) * 1977-12-03 1983-06-21 ナカヤ産業株式会社 spray device
DE8000844U1 (en) * 1980-01-15 1980-04-24 Behr, Hans, 7000 Stuttgart Device for atomizing liquid paint

Also Published As

Publication number Publication date
ATA540781A (en) 1987-05-15
US4429833A (en) 1984-02-07
DE3047670A1 (en) 1982-07-08
DE3047670C2 (en) 1989-02-23
AT384560B (en) 1987-12-10
EP0054820A1 (en) 1982-06-30
DK149504B (en) 1986-07-07
ATE10444T1 (en) 1984-12-15
ZA818572B (en) 1983-01-26
ES8301123A1 (en) 1982-11-16
ES508160A0 (en) 1982-11-16
DE3167507D1 (en) 1985-01-10
JPH0117746B2 (en) 1989-03-31
JPS57140661A (en) 1982-08-31
DK149504C (en) 1987-01-12
MX155218A (en) 1988-02-04
DK545881A (en) 1982-06-19
EP0054820B2 (en) 1989-06-28
BR8108211A (en) 1982-10-05

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