EP0454548B1 - Vorrichtung zum Fliehkraftzerstäuben eines Beschichtungsproduktes, insbesondere zum elektrostatischen Sprühauftragen - Google Patents

Vorrichtung zum Fliehkraftzerstäuben eines Beschichtungsproduktes, insbesondere zum elektrostatischen Sprühauftragen Download PDF

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Publication number
EP0454548B1
EP0454548B1 EP91401044A EP91401044A EP0454548B1 EP 0454548 B1 EP0454548 B1 EP 0454548B1 EP 91401044 A EP91401044 A EP 91401044A EP 91401044 A EP91401044 A EP 91401044A EP 0454548 B1 EP0454548 B1 EP 0454548B1
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EP
European Patent Office
Prior art keywords
reflection surface
axis
disc
rear cavity
frustoconical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91401044A
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English (en)
French (fr)
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EP0454548A1 (de
Inventor
Gérard Degli
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.)
Sames SA
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Sames SA
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Publication date
Application filed by Sames SA filed Critical Sames SA
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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
    • 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
    • B05B15/555—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 discharged by cleaning nozzles

Definitions

  • the invention relates to a device for centrifugal spraying of a coating product such as a paint or a varnish, in particular for electrostatic application of this product; it relates more particularly to an improvement of the rotating member allowing rapid and effective cleaning of the latter.
  • a device for centrifugal spraying of a liquid coating product, comprising a generally rotating member in the form of a bowl, driven in rotation at high speed about its main axis of symmetry.
  • the bowl-shaped part is connected to a hub by an internal veil arranged generally perpendicular to the axis of rotation.
  • This veil divides the internal space of the bowl into two cavities: a front cavity, open in the direction of projection and a rear cavity surrounding at least the largest part of the hub and in which are arranged, fixed and offset with respect to said rotating member. , a coating product ejection nozzle and a cleaning product ejection nozzle. These two nozzles are directed towards the internal face of the veil.
  • the latter has passages formed at its outer periphery (most often a series of small diameter holes arranged along a circle) to allow the flow, under the effect of centrifugal force, of the coating product along from the wall of the internal surface of the bowl, to the edge of the latter where it is sprayed into fine droplets.
  • the rotating member is, in principle, cleaned by projecting onto the veil the cleaning product which is conveyed towards the edge of the bowl by taking the same path as the coating product.
  • the front of the web is not wetted by the coating product and should therefore remain clean.
  • this front face is gradually covered with droplets of poorly liquid coating product, probably due to the violent atmospheric vortices which exist at the front of the bowl due to its rotation at high speed.
  • droplets can be projected by electrostatic forces towards the objects to be covered. They can also move under the action of centrifugal force towards the spraying edge of the bowl where they cause the projection of large droplets of coating product on objects. Consequently, these deposits on the front face of the veil end up causing unacceptable irregularities on the objects to be covered.
  • the invention provides a new type of device for centrifugal spraying of a coating product, remarkable in that the conformation of the rotating member and more particularly of the aforementioned veil, allows dividing the jet of cleaning product into several parts flowing in different directions making it possible to clean all the surfaces of the bowl and in particular the entire front face of the veil.
  • the invention relates more precisely to a device for centrifugal spraying of a coating product, of the type comprising a rotating member, generally in the form of a bowl, provided with an internal veil extending essentially perpendicularly to the axis of rotation of said member.
  • this veil defining inside said bowl a front cavity open in the direction of projection and a rear cavity enveloping said hub, device in which a product ejection nozzle coating and a cleaning product ejection nozzle are housed in said rear cavity and both directed towards said web and in which passages are provided at the outer periphery of said web in the vicinity of said interior surface, characterized in that said sail has an annular recess communicating with said rear cavity and in which a surface is defined of reflection to return part of a jet of liquid to the central part of said veil and in that said nozzle for ejecting cleaning product is oriented towards this reflection surface.
  • the reflection surface mentioned above is a generally concave surface having its concavity turned towards the aforementioned rear cavity while its central part opens into the front cavity.
  • This reflection surface can for example be frustoconical.
  • FIG. 1 show a part of a centrifugal spraying device 11 for the electrostatic application of a coating product, more particularly the rotating member 12 thereof, generally in the form of a bowl, here with a wall frustoconical and driven in rotation about its main axis of symmetry x'x materialized by a rotary shaft 13 driven in rotation at high speed by means not shown, such as for example a turbine.
  • the rotating member comprises an axial hub 15 fixed to the shaft 13 and the bowl 12 a , constituting its outer part, is connected to the hub by an internal veil 16 extending essentially perpendicularly to the axis x'x.
  • This veil therefore divides the interior of the bowl into a front cavity 17, open in the direction of projection of the coating product and a rear cavity 18 open towards the rear of the device and enveloping both the hub 15 and the shaft 13
  • This rear cavity 18 also houses a coating product ejection nozzle 20 and a cleaning product ejection nozzle 22. These two nozzles are fixed relative to the rotating member and are both directed towards the web 16.
  • the latter comprises passages, in this case holes 24 of small diameter, defined at its periphery at vicinity of its connection zone to the internal surface 26 of said bowl 12 a .
  • the surface 26 being divergent in the direction of projection, the coating material ejected at a certain speed of the nozzle 20 strikes the inner surface 16a of web 16 and flows in the film toward the holes 24, and passes through the progresses on the surface 26 to the spraying edge 28 where it is projected in fine droplets towards an object to be covered.
  • the two nozzles 20 and 22 are offset but, in the example shown, oriented parallel to the axis x'x.
  • the nozzle 20 is farther from the axis x'x than the nozzle 22.
  • the diameter of the nozzle of the nozzle 22 is here smaller than that of the nozzle 20; this arrangement is preferable but identical nozzles can be used.
  • the web 16 comprises an annular recess 30 communicating with the rear cavity 18 here by holes 32 regularly spaced along a circular outline centered on the axis x'x.
  • the recess 30 is shaped to define a reflecting surface 34 capable of sending part of a jet of liquid to the end portion 37 of the hub 15, which merges here with the central part of the web.
  • the cleaning product ejection nozzle 22 is oriented towards this surface so that, during the cleaning phase, said cleaning product is projected onto said reflection surface through the holes 32.
  • the reflection surface 34 is a generally concave surface (here substantially frustoconical) having its concavity turned towards said rear cavity 18 while its central zone opens into the front cavity 17 through a large circular orifice 36.
  • the end of the hub 15 is slightly set back axially from the plane of the orifice 36. Its front face is conical.
  • the hub 15 is here slightly frustoconical, the diameter of the latter increasing from back to front. In this way, a liquid deposited on the lateral surface of the hub is driven by centrifugal force in the direction tending to move it away from the axis x'x (towards the front), thus protecting the shaft 13 from any contamination.
  • the holes 32 are also frustoconical and oriented so that their larger diameter orifices open into the rear cavity 18.
  • the holes 32 advantageously have the same conicity as the hub 15, which makes it possible to drill them as much as possible.
  • near the lateral surface of the hub tangent to its frustoconical lateral surface.
  • the axis of ejection of the cleaning product has a significant incidence at its point of impact on the reflection surface 34.
  • incidence the angle A between the axis of the nozzle and the generator of the reflection surface, at the point of impact. This incidence will preferably be between 30 and 60 °.
  • the half-angle at the top of the frustoconical surface 34 will be between 15 and 75 ° and preferably between 30 and 60 °. In the example shown, the incidence A and the half-angle at the top of the frustoconical surface 34 are close to 45 °.
  • the speed of flow of the jet of cleaning liquid is between 15 and 50 m / s.
  • the speed of rotation of the rotary member can be chosen within fairly large limits, between 6000 and 60000 rpm. It will preferably be greater than 20,000 rpm.
  • the coating material is ejected with a velocity selected in the nozzle 20 and encounters the face 16 a of the web 16. As explained above, under the effect of centrifugal force, it is moving towards the spray edge 28 passing through the holes 24 at the periphery of the web 16.
  • the coating product supply is cut off and the cleaning product is ejected with a certain speed chosen by the nozzle 22 in the direction of the web 16.
  • the jet of cleaning liquid when it is not intercepted by the side walls of the holes 32 or the face 16 a between these holes , strikes the reflecting surface 34 and a distribution of the cleaning liquid is observed both on the conical part 37 of the hub and, more generally, on all the areas of the web 16.
  • Cleaning liquid also passes through the holes 24. All of the cleaning liquid ends up flowing along the frustoconical wall 26 to the ejection edge 28.
  • the cleaning liquid which strikes the reflecting surface 36 is divided into several fractions.
  • a first fraction little rotated, is reflected by the surface 34 and directed towards the end portion 37 of the hub.
  • the cleaning liquid thus striking the central part of the veil would then flow under the effect of centrifugal force along the conical end 37 before being ejected radially outwards, in the thickness of the veil.
  • Another fraction also little rotated, flows in the direction of the orifice 36 under the action of its strong force of ejection by the nozzle 22. This part then flows along the front face of the web 16 then, along the frustoconical surface 26.
  • a third fraction rotated flows in the thickness of the web in the direction of larger diameter under the action of the axial component of the centrifugal force.
  • This fraction thus passes through the holes 32 rearwardly and radially flows along the face 16a of the web 16 before passing through the holes 24 towards the spraying edge 28.
  • all parts of the bowl receive cleaning liquid, in particular the entire front face of the veil.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
  • Spray Control Apparatus (AREA)

Claims (12)

  1. Vorrichtung zum Fliehkraftzerstäuben eines Beschichtungsproduktes mit einem im wesentlichen glockeförmig ausgebildeten, sich drehenden Element (12), das mit einer Innenwand (16) ausgestattet ist, die sich im wesentlichen senkrecht zur Rotationsachse des sich drehenden Elements zwischen einer Antriebsnabe (15) und der Innenfläche (26) dieser Glocke erstreckt, wobei diese Wand im Inneren der Glocke einen in Aufsprührichtung offenen vorderen Hohlraum (17) und einen die Nabe umschließenden hinteren Hohlraum (18) begrenzt, in welcher Vorrichtung eine Beschichtungsproduktausstoßdüse (20) und eine Reinigungsmittelausstoßdüse (22) in dem hinteren Hohlraum angeordnet sind, die beide auf die Wand gerichtet sind, und in welcher Bohrungen (24) im äußeren Umfang der Wand in der Nähe der Innenfläche (26) angebracht sind, dadurch gekennzeichnet, daß die Wand eine ringförmige Aussparung (30) umfaßt, die mit dem hinteren Hohlraum (18) in Verbindung steht, und in der eine Reflexionsfläche (34) ausgebildet ist, um einen Teil eines Flüssigkeitsstrahls zum mittleren Teil der Wand hin abzulenken, und daß die Reinigungsmittelausstoßdüse (22) auf diese Reflexionsfläche (34) gerichtet ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Reflexionsfläche (34) eine im wesentlichen konkave Fläche ist, deren Austiefung dem hinteren Hohlraum (18) zugewandt ist und deren mittlerer Bereich in dem vorderen Hohlraum (17) mündet.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die im wesentlichen konkave Fläche (34) im wesentlichen kegelstumpfförmig ist.
  4. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die ringförmige Aussparung mit dem hinteren Hohlraum über Löcher (32) verbunden ist, die auf einer Umfangslinie gleichmäßig beabstandet angebracht sind.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Löcher (32) kegelstumpfförmig sind, wobei ihre Öffnungen mit dem größeren Durchmesser in dem hinteren Hohlraum (18) münden.
  6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Nabe (15) kegelstumpfförmig ist, wobei deren Durchmesser von hinten nach vorn zunimmt.
  7. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Achse der Reinigungsmittelausstoßdüse im wesentlichen parallel zur Rotationsachse (x'x) des sich drehenden Elements ist.
  8. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Einfallswinkel (A) zwischen der Reinigungsmittelausstoßachse und der Reflexionsfläche 30 bis 60° beträgt.
  9. Vorrichtung nach einem der Ansprüche 3 bis 8, dadurch gekennzeichnet, daß der halbe Öffnungswinkel der kegelstumpfförmigen Reflexionsfläche (34) 15° bis 75°, vorzugsweise 30° bis 60°, beträgt.
  10. Vorrichtung nach einem der Ansprüche 3 bis 9, dadurch gekennzeichnet, daß der Einfallswinkel (A) zwischen der Ausstoßachse der Reinigungsmittelausstoßdüse und der Erzeugenden der Reflexionsfläche am Auftreffpunkt sowie der halbe Öffnungswinkel der kegelstumpfförmigen Reflexionsoberfläche (34) ca. 45° betragen.
  11. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Strömungsgeschwindigkeit des Reinigungsmittelstrahls 15 bis 50 m/s beträgt.
  12. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Rotationsgeschwindigkeit des sich drehenden Elements 6000 U/min bis 60.000 U/min, vorzugsweise mehr als 20.000 U/min, beträgt.
EP91401044A 1990-04-24 1991-04-19 Vorrichtung zum Fliehkraftzerstäuben eines Beschichtungsproduktes, insbesondere zum elektrostatischen Sprühauftragen Expired - Lifetime EP0454548B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005203A FR2661115B1 (fr) 1990-04-24 1990-04-24 Dispositif de pulverisation centrifuge d'un produit de revetement, notamment pour application par projection electrostatique.
FR9005203 1990-04-24

Publications (2)

Publication Number Publication Date
EP0454548A1 EP0454548A1 (de) 1991-10-30
EP0454548B1 true EP0454548B1 (de) 1993-10-13

Family

ID=9396026

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91401044A Expired - Lifetime EP0454548B1 (de) 1990-04-24 1991-04-19 Vorrichtung zum Fliehkraftzerstäuben eines Beschichtungsproduktes, insbesondere zum elektrostatischen Sprühauftragen

Country Status (6)

Country Link
US (1) US5137215A (de)
EP (1) EP0454548B1 (de)
JP (1) JPH04227874A (de)
DE (1) DE69100498T2 (de)
ES (1) ES2046868T3 (de)
FR (1) FR2661115B1 (de)

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US5433387A (en) * 1992-12-03 1995-07-18 Ransburg Corporation Nonincendive rotary atomizer
US5633306A (en) * 1992-12-03 1997-05-27 Ransburg Corporation Nonincendive rotary atomizer
DE4306799A1 (de) * 1993-03-04 1994-09-08 Duerr Gmbh & Co Rotationszerstäuber für eine Beschichtungsvorrichtung
DE9419641U1 (de) * 1994-12-07 1995-02-02 Dürr GmbH, 70435 Stuttgart Rotationszerstäuber mit einem Glockenkörper
JP2809170B2 (ja) * 1996-01-19 1998-10-08 トヨタ自動車株式会社 回転霧化静電塗装装置
US5957395A (en) * 1997-10-21 1999-09-28 Illinois Tool Works Inc. Safe charging
US6042030A (en) * 1998-03-23 2000-03-28 Howe; Varce E. Safe charging with non-insulative atomizer
US6322011B1 (en) * 2000-03-14 2001-11-27 Illinois Tool Works Inc. Electrostatic coating system and dual lip bell cup therefor
DE10342188A1 (de) * 2003-02-27 2004-09-16 Dürr Systems GmbH Glockenteller und Rotationszerstäuber
US20050040257A1 (en) * 2003-08-19 2005-02-24 Seitz David M. Atomizer with dedicated cleaning fluid system
RU2322307C2 (ru) * 2006-03-20 2008-04-20 ФГОУ ВПО "Ижевская государственная сельскохозяйственная академия" Центробежный электроаэрозольный генератор
US8602326B2 (en) * 2007-07-03 2013-12-10 David M. Seitz Spray device having a parabolic flow surface
DE102014019309A1 (de) * 2014-12-20 2016-06-23 Eisenmann Se Düsenkopf und Rotationszerstäuber mit einem solchen
CN112657697A (zh) * 2020-12-15 2021-04-16 安徽新和博亚电子科技有限公司 电子元器件表面粉末静电喷涂设备及其喷涂方法

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US3749315A (en) * 1972-06-23 1973-07-31 Crathern Eng Centrifugal dispensing device
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DE3001209C2 (de) * 1980-01-15 1985-07-25 Behr, Hans, 7000 Stuttgart Vorrichtung zum Vernebeln flüssiger Farbe, insbesondere Lackzerstäuber
JPS5787863A (en) * 1980-11-19 1982-06-01 Toyota Motor Corp Spraying head of rotary atomizing electrostatic coating device
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DE8708312U1 (de) * 1987-06-12 1987-07-30 Behr Industrieanlagen GmbH & Co, 74379 Ingersheim Einrichtung zum Vernebeln flüssiger Farbe

Also Published As

Publication number Publication date
DE69100498T2 (de) 1994-03-17
ES2046868T3 (es) 1994-02-01
FR2661115B1 (fr) 1992-07-31
DE69100498D1 (de) 1993-11-18
EP0454548A1 (de) 1991-10-30
JPH04227874A (ja) 1992-08-17
US5137215A (en) 1992-08-11
FR2661115A1 (fr) 1991-10-25

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