EP1480756B1 - Rotationszerstäuber für beschichtungsmittel - Google Patents

Rotationszerstäuber für beschichtungsmittel Download PDF

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Publication number
EP1480756B1
EP1480756B1 EP03722683A EP03722683A EP1480756B1 EP 1480756 B1 EP1480756 B1 EP 1480756B1 EP 03722683 A EP03722683 A EP 03722683A EP 03722683 A EP03722683 A EP 03722683A EP 1480756 B1 EP1480756 B1 EP 1480756B1
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EP
European Patent Office
Prior art keywords
sprayer device
sprayer
liquid
core
distributor
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Expired - Lifetime
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EP03722683A
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English (en)
French (fr)
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EP1480756A1 (de
EP1480756B2 (de
Inventor
Patrick Ballu
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Sames Kremlin SAS
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Sames Technologies SAS
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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
    • B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
    • B05B15/18—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts for improving resistance to wear, e.g. inserts or coatings; for indicating wear; for handling or replacing worn parts
    • 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

Definitions

  • the invention relates to a spraying device, commonly referred to as a spraying bowl, for spraying a liquid coating product into fine droplets; it applies in particular to the spraying of any type of paint or varnish, liquid.
  • the invention also relates to any rotary head sprayer equipped with such a spraying device.
  • the invention is preferably applied to a sprayer with a very high rotational speed, typically of the order of 50,000 to 100,000 revolutions per minute.
  • bowl or bell-shaped coating product spraying devices rotating at high speed.
  • the spray material flows on the inner surface of the bowl and, under the effect of centrifugal force, reaches the edge thereof where it is sprayed into fine droplets.
  • the bowl is most often shaped so that the surface that faces the object to be covered is generally concave, often frustoconical.
  • the patent US 2658472 describes a spray bell inside which there are liquid ejection nozzles directed towards the distribution surface. The presence of these nozzles disturbs the rotational drive of the volume of air inside the spray bell. In addition, the nozzles deposit the liquid at a very short distance from the spray edge, which is unfavorable to a good spread of the liquid on said distribution surface, before spraying on the edge of the bell.
  • the invention proposes a rotary spray device having a combination of several characteristics that combine to obtain a finer spray, with an extremely narrow droplet diameter distribution, making it possible to obtain, in the case in particular of a paint, a better aspect of the deposit.
  • the invention relates to a device for spraying liquid coating product comprising a divergent centrifugal baffle having a spray edge and capable of being rotated about an axis of rotation, characterized in that it comprises a tubular hub forming or sheltering a liquid supply duct, in that said centrifugal baffle comprises a continuous distribution surface extending between said hub and said spray edge, in that said distribution surface has the overall shape of a trumpet horn and in that it comprises means for substantially radially deflecting at least a portion of said liquid towards the innermost portion of said trumpet horn distribution surface.
  • Thinning of the thickness of the layer, as and when of its progression towards the spraying edge is also attributable to a strong increase in the surface of the elementary ring of distribution, according to the perpendicular to the axis of rotation, because of the shape, in "trumpet", of the surface of distribution, this surface increase being combined with that of the centrifugal speed of the liquid, related to the distance with respect to the axis.
  • trumpet shape of this surface is favorable to good cleaning with a liquid cleaning product injected instead of the liquid to be sprayed. More specifically, this surface has no discontinuity that can lead to an undesirable accumulation of certain components of the liquid to be sprayed, including some pigments.
  • the spray edge may be a sharp or notched edge. Streaks may be impressed in this area, in the vicinity of the spraying edge, or disposed on the distribution surface.
  • the profile of the distribution surface along a half-section passing through the axis of rotation of said rotary bowl has substantially the shape of an exponential.
  • rapid growth we mean any function whose derivative increases with the variable.
  • a section of hyperbolic function can also be adopted as a profile. Any linear combination of these types of curves is also suitable.
  • any rotating spraying bowl combining a central feed (ie an axial injection of liquid into the hub) with a distribution surface of the type described above is within the scope of the invention .
  • the bowl comprises a distributor mounted in the axial extension of said hub, extending at the bottom of said baffle and comprising a core preventing the axial flow of the liquid and radial passages arranged at the rear of said core. for directing at least most of the liquid flow to said distribution surface.
  • a liquid spraying device 11 comprising a revolution element 12 intended to be rotated at a relatively high speed around a main axis x 'x.
  • This device is particularly suitable for the electrostatic projection of liquid coating products such as paints or varnishes.
  • the revolution element 12 essentially consists of an axial, tubular hub 13, extended forwards by a divergent centrifugal baffle 14 having a circular spraying edge 15.
  • the hub 13 constitutes or houses a liquid supply duct.
  • the liquid to be sprayed propagates forward until it reaches a continuous distribution surface 18 extending between the hub and the spray edge.
  • the hub 13 is intended to be mounted at the end of a hollow shaft of a drive device, not shown. Conventionally, this drive device is a compressed air turbine.
  • the liquid to be sprayed is introduced by an injector 17 placed in the hollow shaft of this turbine and in the hub. It flows forward spreading over said distribution surface 18.
  • Said hub 13 has a thread 20 through which it can be attached to the shaft of the turbine.
  • the attachment may be magnetic as described in the document FR 2805182 .
  • Said distribution surface 18 is generally in the shape of a trumpet horn and the liquid coming out of the hub 13, more precisely here from the injector 17, is distributed in a thin film on the distribution surface while progressing to the edge of the spray where it is sprayed into fine droplets, under the effect of centrifugal force.
  • the centrifugal deflector 14 is at least partially made of conductive material of electricity. It is generally placed at a high negative electric potential, close to 100 kV, and the object to be painted is placed at the potential of the earth.
  • FIG. 1 schematically shows a high voltage source 19 electrically connected to the deflector 14.
  • This may for example be metal, or internally covered with a conductive layer of electricity.
  • the action of the high electric field, in the vicinity of the spraying edge 15, also contributes, as the effect of the centrifugal force, to break the thin film into fine droplets.
  • a continuous profile of the divergent centrifugal deflector such as that given by a trumpet shape, makes it possible, because of its large radius of curvature, to concentrate the electric field in the zone having the smallest radius of curvature, that is to say on the spray edge, precisely where the droplets are formed by essentially mechanical effect.
  • the trumpet shape is therefore favorable to all the means which contributes to the good spraying of the liquid on the spray edge, that is to say a mechanical effect and an electrostatic effect.
  • the distribution area 18 is generally in the shape of a trumpet horn.
  • said distribution surface generally has a certain convexity directed towards the object to be covered.
  • the distribution area along a half-section passing through the axis of rotation here is substantially in the form of an exponential.
  • the revolution element 12 composed of the hub and the centrifugal deflector houses means for substantially radially deflecting a portion of the liquid towards the innermost part of the distribution surface 18.
  • it is a distributor 22 mounted in the axial extension of the hub 13 and extending partly to the bottom of the deflector 14.
  • This distributor has the function of deflecting the liquid introduced axially so that the majority of the liquid flow is directed towards the distribution surface 18 in the innermost part of it.
  • This distributor 22 comprises a core 24 obstructing the axial flow of the liquid. It is provided with radial passages 26 arranged at the rear of the core.
  • the core 24 has a lateral surface of revolution 28 extending opposite and away from the distribution surface 18, in the innermost zone thereof, to define with said surface an annular passageway 30. extending said radial passages.
  • the distributor 22 comprises a tubular element of revolution 32, a rear mounting portion 34 of which is fixed inside the axial hub 13.
  • the injector 17 terminates in a nozzle engaged in the axial cavity of the the mounting portion 34, opposite the rear face of the core 24.
  • the radial passages 26 are constituted by three cutouts made in the element 32 between said mounting portion and the core 24. In fact, these three cutouts do not leave in the element 32 that three bridges 36 shifted circumferentially 120 degrees from each other and connecting said mounting portion 34 to the core 24.
  • the most central portion of the deflector is lined internally with an annular wear part 50 integrated with the innermost part of the distribution surface 18. More particularly, the apparent surface, inside, of this annular piece and extends the distribution surface 18 without interruption of continuity. It is generally radially outside and facing the radial passages 26.
  • This annular wear part can be fitted at the bottom of the baffle. In this case, it is scheduled to be replaced regularly.
  • the annular piece may, on the contrary, be made of a material that is highly resistant to abrasion (ceramic, hard metal, etc.) or at least its internal surface, facing the radial passages 26, may be covered with a material resistant to abrasion, for example titanium nitride.
  • at least the innermost part of the distribution surface 18 (that is to say that which faces the passages 26) is covered with a layer of abrasion resistant material.
  • the core 24 has four diverging channels 38 extending between the rear surface thereof and an annular abutment surface 39 surrounding an axial passage 40 extending into a front portion of said core.
  • the annular abutment surface 39 beyond the front openings of the channels, is extended by a rounded surface 42 tangentially joining the front face of the core.
  • This comprises a first insert 44 fixed in the front part of the dispenser, plus particularly at the front of the element 32.
  • the annular abutment surface 39 extending opposite the orifices of the diverging channels 38 and the axial passage 40 which extends this annular abutment surface are defined in the insert 44.
  • a housing cylindrical, defined at the rear of the cap, houses a second insert 46 enclosing the four diverging channels.
  • the distributor 22, that is to say more particularly the element of revolution 32, is forcibly mounted inside the hub 13 while the first insert 44 is itself mounted forcibly. in the front portion of said dispenser.
  • the insert 46 is for its part force-fitted into the insert 44.
  • the channels 38 could be replaced by splines made on the outer surface of the insert 46 or on the inner surface of the housing of said insert. All these elements can be plastic or metal. The operation is as follows.
  • the liquid When the liquid is introduced under pressure into the injector 17, it hits the rear face of the core 24 and is partially deflected radially to the bottom of the distribution surface 18. The liquid continues to propagate, under the effect centrifugal force, on this surface forming a thinner film thinner and thinner as it progresses to the edge of spraying. When the liquid reaches the spray edge, it is sprayed into fine droplets.
  • a small portion of the liquid engages in the diverging channels 38 and strikes the annular abutment surface 39.
  • This secondary flow of liquid bypasses the rounded surface 42 of the axial passage 40 without being projected forward and progresses radially towards the external to the front surface of the dispenser to join the main flow of liquid flowing along the distribution surface 18.
  • the front of the dispenser is constantly wet with liquid. If the liquid is a paint or varnish, there is no risk of drying on the surface of the dispenser.
  • the spraying device can easily be cleaned by injecting a cleaning liquid in place of the liquid coating product.
  • the ratio between the maximum diameter of the distributor 22 and the diameter of the spray edge 15 can be between 5 and 60%. Preferably, this ratio will be between 10 and 40%.
  • the diameter of the spray edge is generally between 25 and 100 mm.
  • the distributor 22 may be replaced by a radial wall attached to the element of revolution and having a ring of holes, this arrangement being known per se.
  • any liquid sprayer especially any paint sprayer or varnish
  • a spraying device as described above.
  • a sprayer generally consists of a rotary drive device, such as a compressed air turbine, carrying the spraying device and arranged to allow axial injection of spray liquid inside the hub.
  • This sprayer is generally completed by a high voltage power supply carrying the centrifugal baffle 14 (conductive, for example metallic) at a high voltage.
  • the speed of rotation can be 50 000 to 100 000 revolutions / minute and the device which has just been described is remarkable for its ability to give a very fine and very regular spray (small size difference of the droplets) , this in a very wide range of rotational speeds.
  • the spraying is still excellent even when the speed of rotation is below the speed range indicated above.
  • the rotation speed can be lowered up to 20,000 rpm with an acceptable spray.

Claims (22)

  1. Vorrichtung zur Zerstäubung eines flüssigen Beschichtungsmittels, die einen sich erweiternden zentrifugalen Deflektor (Fliehkraft-Deflektor) (14) aufweist, der einen Zerstäubungsrand (15) aufweist und um eine Drehachse drehend antreibbar ist, wobei die Vorrichtung eine rohrförmige Nabe (13) umfasst, die einen Flüssigkeitszuführkanal bildet oder beherbergt, wobei der zentrifugale Deflektor (14) eine kontinuierliche Verteilungsfläche (18) aufweist, die sich zwischen der Nabe und dem Zerstäubungsrand erstreckt, wobei diese Verteilungsfläche in ihrer Gesamtheit die Form eines Trompetentrichters hat, dadurch gekennzeichnet, dass sie Mittel aufweist, um mindestens einen Teil der Flüssigkeit im Wesentlichen radial in Richtung des innersten Teils der Verteilungsfläche von der Form eines Trompetentrichters abzulenken.
  2. Vorrichtung zur Zerstäubung nach Anspruch 1, dadurch gekennzeichnet, dass das Profil der Verteilungsfläche (18) entlang eines durch die Drehachse verlaufenden Halbschnittes im Wesentlichen die Form einer Exponentialfunktion hat.
  3. Vorrichtung zur Zerstäubung nach Anspruch 1, dadurch gekennzeichnet, dass das Profil der Verteilungsfläche (18) entlang eines durch die Drehachse verlaufenden Halbschnittes die Form eines Hyperbelabschnittes hat.
  4. Vorrichtung zur Zerstäubung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie einen in der axialen Verlängerung der Nabe (13) angebrachten Verteiler (22) aufweist, der sich am Boden des Deflektors erstreckt, wobei dieser Verteiler einen Kern (24), der ein Hindernis für die axiale Strömung der Flüssigkeit bildet, und radiale Durchlässe (26), die hinter dem Kern angeordnet sind, aufweist, um mindestens den größten Teil des Flüssigkeitsstromes zu der Verteilungsfläche (18) hin zu lenken.
  5. Vorrichtung zur Zerstäubung nach Anspruch 4, dadurch gekennzeichnet, dass der Kern (24) eine seitliche Rotationsfläche (28) aufweist, die sich gegenüber der Verteilungsfläche (18) und in einem Abstand von dieser erstreckt, um mit derselben einen ringförmigen Durchlass (30) zu definieren, der die radialen Durchlässe verlängert.
  6. Vorrichtung zur Zerstäubung nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass der Kern (24) Kanäle (38) aufweist, die sich zwischen einer hinteren Fläche desselben und einer ringförmigen Anschlagfläche (39) erstrecken, die einen Durchlass (40) umgibt, der sich in einem vorderen Teil des Kerns erstreckt.
  7. Vorrichtung zur Zerstäubung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass der Verteiler ein rohrförmiges Rotationselement (32) aufweist, von dem ein hinterer Montageabschnitt (34) im Inneren der Nabe (13) befestigt ist, wobei die radialen Durchlässe hinter dem Kern in diesem Rotationselement ausgebildet sind.
  8. Vorrichtung zur Zerstäubung nach Anspruch 6, dadurch gekennzeichnet, dass der Kern einen ersten Einsatz (44) umfasst, der im vorderen Teil des Verteilers befestigt ist und die ringförmige Anschlagfläche (39) und den Durchlass (40) aufweist.
  9. Vorrichtung zur Zerstäubung nach Anspruch 8, dadurch gekennzeichnet, dass ein zweiter Einsatz (46) hinter dem ersten Einsatz angebracht ist und die auseinander laufenden Kanäle verschließt.
  10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass der Durchlass (40) axial ist.
  11. Vorrichtung zur Zerstäubung nach einem der Ansprüche 4 bis 10, dadurch gekennzeichnet, dass der Verteiler (22) kraftschlüssig im Inneren der Nabe (13) angebracht ist.
  12. Vorrichtung zur Zerstäubung nach einem der Ansprüche 8 bis 11, dadurch gekennzeichnet, dass der erste Einsatz (44) kraftschlüssig im vorderen Teil des Verteilers angebracht ist.
  13. Vorrichtung zur Zerstäubung nach einem der Ansprüche 8 bis 12, dadurch gekennzeichnet, dass der zweite Einsatz (46) kraftschlüssig in dem Kern angebracht ist.
  14. Vorrichtung zur Zerstäubung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der zentralste Teil des Deflektors innen mit einem ringförmigen Verschleißteil (50) ausgekleidet ist, das in den innersten Teil der Verteilungsfläche integriert ist, wobei das ringförmige Teil auswechselbar ist.
  15. Vorrichtung zur Zerstäubung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass der zentralste Teil des Deflektors innen mit einem ringförmigen Teil versehen ist, von dem wenigstens die Innenfläche aus einem abriebfesten Material besteht.
  16. Vorrichtung zur Zerstäubung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass wenigstens der innerste Teil der Verteilungsfläche mit einer abriebfesten Materialschicht überzogen ist.
  17. Vorrichtung zur Zerstäubung nach einem der Ansprüche 4 bis 16, dadurch gekennzeichnet, dass das Verhältnis zwischen dem maximalen Durchmesser des Verteilers (22) und dem Durchmesser des Zerstäubungsrandes (15) zwischen 5 und 60 %, vorzugsweise zwischen 10 und 40 % liegt.
  18. Vorrichtung zur Zerstäubung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie für die elektrostatische Zerstäubung ausgerüstet ist.
  19. Vorrichtung zur Zerstäubung nach Anspruch 5, dadurch gekennzeichnet, dass Mittel vorgesehen sind, um Luft in dem ringförmigen Durchlass (30) zirkulieren zu lassen.
  20. Vorrichtung zur Zerstäubung nach Anspruch 6, dadurch gekennzeichnet, dass Mittel vorgesehen sind, um Luft in dem Durchlass (40) zirkulieren zu lassen.
  21. Vorrichtung zur Zerstäubung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der sich erweiternde zentrifugale Deflektor (14) wenigstens teilweise aus einem elektrisch leitenden Material besteht, und dass er an eine Hochspannungsquelle angeschlossen ist.
  22. Zerstäuber eines flüssigen Beschichtungsmittels, insbesondere von Farbe oder Lack, dadurch gekennzeichnet, dass er eine Vorrichtung zur Zerstäubung nach einem der vorhergehenden Ansprüche umfasst.
EP03722683.4A 2002-03-01 2003-02-28 Rotationszerstäuber für beschichtungsmittel Expired - Lifetime EP1480756B2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0202638A FR2836638B1 (fr) 2002-03-01 2002-03-01 Dispositif de pulverisation de produit de revetement liquide
FR0202638 2002-03-01
PCT/FR2003/000662 WO2003074187A1 (fr) 2002-03-01 2003-02-28 Dispositif de pulverisation de produit de revetement liquide

Publications (3)

Publication Number Publication Date
EP1480756A1 EP1480756A1 (de) 2004-12-01
EP1480756B1 true EP1480756B1 (de) 2011-01-26
EP1480756B2 EP1480756B2 (de) 2022-05-18

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EP03722683.4A Expired - Lifetime EP1480756B2 (de) 2002-03-01 2003-02-28 Rotationszerstäuber für beschichtungsmittel

Country Status (11)

Country Link
US (1) US6659367B2 (de)
EP (1) EP1480756B2 (de)
JP (1) JP2005527345A (de)
CN (1) CN1323764C (de)
AT (1) ATE496703T1 (de)
AU (1) AU2003229848A1 (de)
DE (1) DE60335861D1 (de)
ES (1) ES2357345T5 (de)
FR (1) FR2836638B1 (de)
PT (1) PT1480756E (de)
WO (1) WO2003074187A1 (de)

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FR2945461B1 (fr) * 2009-05-13 2012-10-05 Sames Technologies Projecteur et organe de pulverisation de produit de revetement et procede de projection mettant en oeuvre un tel projecteur.
FR2989289B1 (fr) * 2012-04-13 2015-07-17 Sames Technologies Projecteur rotatif et methode de pulverisation d'un produit de revetement
FR3004767B1 (fr) 2013-04-17 2015-05-15 Sames Technologies Pompe a effet venturi et installation d'application de revetement de peinture
FR3012985B1 (fr) 2013-11-12 2016-12-09 Sames Tech Projecteur electrostatique de produit de revetement et installation de projection comprenant un tel projecteur
US8851397B1 (en) * 2013-11-14 2014-10-07 Efc Systems, Inc. Bell cup atomizer having improved cleaning capability
CA2937837C (en) * 2014-01-29 2019-08-06 Honda Motor Co., Ltd. Rotary atomizing coating device and spray head
JP6158737B2 (ja) * 2014-03-31 2017-07-05 芝浦メカトロニクス株式会社 基板処理装置及び基板処理方法
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JP2005527345A (ja) 2005-09-15
PT1480756E (pt) 2011-03-29
CN1638875A (zh) 2005-07-13
AU2003229848A1 (en) 2003-09-16
EP1480756A1 (de) 2004-12-01
DE60335861D1 (de) 2011-03-10
ES2357345T5 (es) 2022-06-17
FR2836638A1 (fr) 2003-09-05
FR2836638B1 (fr) 2004-12-10
CN1323764C (zh) 2007-07-04
US6659367B2 (en) 2003-12-09
US20030164406A1 (en) 2003-09-04
ATE496703T1 (de) 2011-02-15
ES2357345T3 (es) 2011-04-25
EP1480756B2 (de) 2022-05-18
WO2003074187A1 (fr) 2003-09-12

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