EP0034278B1 - Procédé et appareil pour le revêtement électrostatique d'objets à l'aide d'un fluide - Google Patents

Procédé et appareil pour le revêtement électrostatique d'objets à l'aide d'un fluide Download PDF

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Publication number
EP0034278B1
EP0034278B1 EP81100609A EP81100609A EP0034278B1 EP 0034278 B1 EP0034278 B1 EP 0034278B1 EP 81100609 A EP81100609 A EP 81100609A EP 81100609 A EP81100609 A EP 81100609A EP 0034278 B1 EP0034278 B1 EP 0034278B1
Authority
EP
European Patent Office
Prior art keywords
bell
fluid
spray
spray bell
paint
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
EP81100609A
Other languages
German (de)
English (en)
Other versions
EP0034278A3 (en
EP0034278A2 (fr
Inventor
Roland Andreas Dipl.-Ing. Meisner
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF Farben und Fasern AG, BASF Lacke und Farben AG filed Critical BASF Farben und Fasern AG
Priority to AT81100609T priority Critical patent/ATE9203T1/de
Publication of EP0034278A2 publication Critical patent/EP0034278A2/fr
Publication of EP0034278A3 publication Critical patent/EP0034278A3/de
Application granted granted Critical
Publication of EP0034278B1 publication Critical patent/EP0034278B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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
    • 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
    • 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
    • B05B5/0415—Driving means; Parts thereof, e.g. turbine, shaft, bearings

Definitions

  • the invention relates to a method for the electrostatic coating of objects with liquids, in particular liquid paint, by supplying the liquid to a high-voltage spray bell rotating at a high speed of between 15,000 and 60,000 rpm and throwing the liquid off the spray edge of the spray bell coating object with the help of an annular air jacket.
  • a so-called low-speed bell is known from DE-B-22 48 167, in which the paint is atomized by electrostatic forces. As soon as the paint is fed to the atomizer head, it is transported to the edge by centrifugal forces. The surface tension of the liquid causes the paint to form a bead on the outer edge of the spray head. Threads are drawn off electrically from this bead. Due to the shifting of the charge in the electric field, the force acting on the thread increases and the liquid pressure inside the thread also increases. If this pressure is greater than the surface tension, the thread is torn and has a high intrinsic charge due to the charge shift. All paint particles charged with the same polarity repel each other, but are attracted to the grounded workpiece.
  • centrifugal forces exclusively cause the paint to be transported to the atomizing edge. Only when the electric field is switched off and further paint supply is applied, is centrifugal forces throwing off paint from the bead growing on the edge of the bell. These drops have a large diameter and are not suitable for many painting jobs.
  • usable atomization is achieved only by the high voltage.
  • the electrical properties of the lacquer thus prove to be important for its good atomization. The higher the paint resistance, the higher the high voltage must be to facilitate good atomization.
  • a high-speed bell is known from DE-C-973 478, which forms the preambles of the independent claims. For every paint system there are speeds at which the centrifugal force becomes the decisive atomizing force, whereby electrostatic repulsion only plays a minor role.
  • High-speed bells can atomize both highly conductive and semi-conductive paints. All known constructions of this type, as they are also known, for example, as DE-B-12 40 764, work with an atomizer hub in order to prevent the paint from leaving the atomizer system before being transferred to the spray bell.
  • the invention has for its object to provide a method with which liquid, in particular liquid paint, can be sprayed onto an object to be processed, even difficult coating materials, such as metallic lacquers, can be processed and a uniform fine distribution of the liquid is ensured, without fear that there are air pockets and dried paint particles from the atomizer hub are re-introduced into the paint.
  • This object of the invention is achieved in that the liquid in the axial center of the circumferential spray bell in the axial direction of the same freely supplied to the bell interior and thereby slows down its conveying speed to almost zero and is exposed to the toroidal vortex formed there and by the toroidal vortex of the inner wall of the rotating bell is fed.
  • the invention makes use of the toroidal vortex which forms in a bell-shaped cavity at a high rotational speed of the bell and which has a circular bead rotating around its central axis with a backflow component directed deepest in the bell center and a bell executed on the inner edge of the bell to the outside of the bell and with the bell rotating flow component.
  • the paint to be sprayed is fed into the center of the bell in such a way that the paint mouth ends freely in the center of the bell space and is exposed here to the conveying component of the torus vortex directed backwards.
  • the momentum of the supplied liquid at the outlet opening of the liquid supply line is only so great that the forces applied by the toroidal vortex can cause a deflection in the direction of the inner surface of the bell.
  • the invention is also directed to a Device for electrostatically coating objects with liquids, in particular liquid paint, with a bell rotating about a fixed hollow axis with a central liquid supply and a number of compressed air nozzles surrounding the bell.
  • a device of this type is described in DE-C-973 478.
  • the outlet opening of the hollow axis opening centrally in the base of the bell opens freely towards the interior of the bell and a diffuser is provided in the region of the end of the hollow axis which reduces the conveying speed of the liquid conveyed in the hollow axis.
  • the known additional compressed air nozzles are arranged in the rear area of the spray bell, so that the air balance around the rotating bell is ensured and the sprayed paint mist cone receives a defined axial thrust from the circularly rotating air curtain.
  • a hollow axis 1 which supports bearings 10, 10 'for a spray bell 2 with a rotor 5, a stator 11 and a dynamic seal 20 and a fabric bushing 16.
  • An electrical lead 8 for the stator 11 is guided in a groove 17 on the hollow axis 1 through the bearing 10 '.
  • the hollow axis 1 ends in a diffuser 12, which is closed by a rectifying sieve 14.
  • the inlet of the diffuser 12 is designed as a valve seat 3, on which the liquid flow can be shut off using a valve needle 4.
  • the bell inner contour carries a radial toothing 15 for the transmission of the Coriolis force.
  • Compressed air nozzles 9 of a nozzle ring 6 produce an annular air curtain which imparts an axial thrust to the paint mist sprayed on a spray edge 13 of the spray bell 2.
  • the paint to be sprayed is introduced via a line 7.
  • a pneumatic drive with a turbine rotor 18 and a nozzle ring 19 is provided instead of the electric drive.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Paints Or Removers (AREA)
  • Pens And Brushes (AREA)

Claims (5)

1. Procédé pour le revêtement électrostatique d'objets à l'aide de liquides, en particulier de peinture liquide, par amenée du liquide à une cloche de pulvérisation soumise à une haute tension et tournant à une grande vitesse de rotation, comprise entre 15000 et 60 000 tours/mn, et projection du liquide par le bord de pulvérisation de la cloche de pulvérisation sur l'objet à revêtir, à l'aide d'un rideau annulaire d'air, caractérisé en ce que le liquide est amené librement à l'intérieur de la cloche, au centre axial de la cloche de pulvérisation en rotation et dans la direction axiale de celle-ci et que sa vitesse de transport diminue ainsi à peu près jusqu'à zéro et qu'il est exposé au tourbillon torique qui se constitue en cet endroit et est amené, par la tourbillon torique, à la paroi intérieure de la cloche en rotation.
2. Appareil pour le revêtement électrostatique d'objets à l'aide de liquides, en particulier de peinture liquide, comportant une cloche de pulvérisation (2) à amenée centrale de liquide, tournant autour d'un axe creux fixe (1) et un certain nombre de buses à air comprisé (9) entourant la cloche de pulvérisation (2), caractérisé en ce que l'ouverture de sortie de l'axe creux (1), débouchant de façon centrée au fond de la cloche, s'ouvre librement vers l'intérieur de la cloche et que dans la région de l'extrémité de l'axe creux est prévu un diffuseur (12).
3. Appareil selon la revendication 2, caractérisé en ce que dans la parcours d'écoulement du liquide, le diffuseur (12) est suivi, dans le sens d'écoulement, d'un tamis redresseur (14).
4. Appareil selon les revendications 2 et 3, caractérisé en ce que le côté intérieur de la cloche de pulvérisation (2) est muni d'une denture radiale (15) de sorte que la transmission d'énergie de la cloche de pulvérisation (2) au tourbillon torique et au liquide s'effectue rigidement.
5. Appareil selon la revendication 2, caractérisé en ce que les buses à air comprimé (9) sont disposées dans la région postérieure de la cloche de pulvérisation (2).
EP81100609A 1980-02-15 1981-01-28 Procédé et appareil pour le revêtement électrostatique d'objets à l'aide d'un fluide Expired EP0034278B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81100609T ATE9203T1 (de) 1980-02-15 1981-01-28 Verfahren und vorrichtung zum elektrostatischen ueberziehen von gegenstaenden mit einem fluid.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3005677A DE3005677C2 (de) 1980-02-15 1980-02-15 Verfahren und Vorrichtung zum elektrostatischen Überziehen von Gegenständen mit Flüssigkeiten
DE3005677 1980-02-15

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP83102488A Division EP0089043A3 (fr) 1981-01-28 1981-01-28 Procédé et appareil pour le revêtement électrostatique des objets par des fluides
EP83102488.0 Division-Into 1981-01-28

Publications (3)

Publication Number Publication Date
EP0034278A2 EP0034278A2 (fr) 1981-08-26
EP0034278A3 EP0034278A3 (en) 1981-12-16
EP0034278B1 true EP0034278B1 (fr) 1984-09-05

Family

ID=6094700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100609A Expired EP0034278B1 (fr) 1980-02-15 1981-01-28 Procédé et appareil pour le revêtement électrostatique d'objets à l'aide d'un fluide

Country Status (10)

Country Link
US (1) US4402991A (fr)
EP (1) EP0034278B1 (fr)
JP (1) JPS56141870A (fr)
AT (1) ATE9203T1 (fr)
BR (1) BR8100890A (fr)
DE (2) DE3005677C2 (fr)
DK (1) DK157903C (fr)
ES (1) ES8206222A1 (fr)
MX (1) MX149160A (fr)
ZA (1) ZA81929B (fr)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK151198B (da) * 1984-10-26 1987-11-09 Niro Atomizer As Forstoeverhjul til brug i et forstoevningstoerringsanlaeg
EP0203830B1 (fr) * 1985-05-31 1990-01-31 Unimation Inc. Disperseur à tuyère tournante
US4659018A (en) * 1985-05-31 1987-04-21 Westinghouse Electric Corp. Orbiting nozzle dispersion apparatus
DE3616684A1 (de) * 1986-05-16 1987-11-19 Behr Industrieanlagen Zerstaeuber zum elektrostatischen beschichten von gegenstaenden
DE3634443A1 (de) * 1986-10-09 1988-04-21 Lactec Ges Fuer Moderne Lackte Vorrichtung zum elektrostatischen aufbringen von fliessfaehigen medien
US5086972A (en) * 1990-08-01 1992-02-11 Hughes Aircraft Company Enhanced electrostatic paint deposition method and apparatus
CA2128398C (fr) * 1994-07-19 2007-02-06 John Sulzer Appareil de coulee en continue de bandes metalliques, injecteur utilise pour ce faire et procede connexe
US6409104B1 (en) 2000-04-19 2002-06-25 Ford Global Technologies, Inc. Silicon-doped amorphous carbon coating for paint bell atomizers
GR1003825B (el) * 2001-03-29 2002-02-26 Φυγοκεντρικη γεννητρια του αεροζολ
US6889921B2 (en) * 2002-09-30 2005-05-10 Illinois Tool Works Inc. Bell cup skirt
US7128277B2 (en) 2003-07-29 2006-10-31 Illinois Tool Works Inc. Powder bell with secondary charging electrode
US20050023385A1 (en) * 2003-07-29 2005-02-03 Kui-Chiu Kwok Powder robot gun
US20050056212A1 (en) * 2003-09-15 2005-03-17 Schaupp John F. Split shroud for coating dispensing equipment
US20050173556A1 (en) * 2004-02-09 2005-08-11 Kui-Chiu Kwok Coating dispensing nozzle
DE102006022057B3 (de) * 2006-05-11 2007-10-31 Dürr Systems GmbH Applikationselement für einen Rotationszerstäuber und zugehöriges Betriebsverfahren
GB0625583D0 (en) * 2006-12-21 2007-01-31 Itw Ltd Paint spray apparatus
US8371517B2 (en) 2007-06-29 2013-02-12 Illinois Tool Works Inc. Powder gun deflector
US8602326B2 (en) * 2007-07-03 2013-12-10 David M. Seitz Spray device having a parabolic flow surface
US20090020626A1 (en) * 2007-07-16 2009-01-22 Illinois Tool Works Inc. Shaping air and bell cup combination
US8096264B2 (en) * 2007-11-30 2012-01-17 Illinois Tool Works Inc. Repulsion ring
US10155233B2 (en) * 2008-04-09 2018-12-18 Carlisle Fluid Technologies, Inc. Splash plate retention method and apparatus
US20090314855A1 (en) * 2008-06-18 2009-12-24 Illinois Tool Works Inc. Vector or swirl shaping air

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973478C (de) * 1952-04-01 1960-03-03 Metallgesellschaft Ag Vorrichtung zur Ausbildung fein verteilter Nebel in Form einer Wolke fuer die Abscheidung im elektrostatischen Feld unter Anwendung eines Hilfsgasstromes

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US2980338A (en) * 1954-03-04 1961-04-18 Fischer & Co H G Electrostatic paint spraying system
US2728606A (en) * 1954-05-24 1955-12-27 Ransburg Electro Coating Corp Liquid feeding apparatus
US2850322A (en) * 1956-05-31 1958-09-02 Rheem Mfg Co Centrifugal spray head
US2893894A (en) * 1958-11-03 1959-07-07 Ransburg Electro Coating Corp Method and apparatus for electrostatically coating
DE1240764B (de) * 1963-03-15 1967-05-18 Mueller Ernst Fa Verfahren zum elektrostatischen UEberziehen von Gegenstaenden mit Farbe und Vorrichtung zur Durchfuehrung des Verfahrens
US4114564A (en) * 1963-06-13 1978-09-19 Ransburg Corporation Electrostatic coating apparatus
US3442688A (en) * 1964-11-13 1969-05-06 Gen Motors Corp Electrostatic spray coating method and apparatus therefor
US3418971A (en) * 1964-11-13 1968-12-31 Gen Motors Corp Apparatus for electrostatic spray coating
US3393662A (en) * 1964-12-30 1968-07-23 Ronald J. Blackwell Apparatus for electrostatic spray coating
DE1933147A1 (de) * 1969-06-30 1971-01-21 Mueller Ernst Kg Farbspritzpistole fuer das elektrostatische Farbspritzen
GB1599303A (en) * 1977-09-20 1981-09-30 Nat Res Dev Electrostatic spraying
JPS5511064A (en) * 1978-07-12 1980-01-25 Toyota Motor Corp Rotary type electrostatic coater for conductive paint

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973478C (de) * 1952-04-01 1960-03-03 Metallgesellschaft Ag Vorrichtung zur Ausbildung fein verteilter Nebel in Form einer Wolke fuer die Abscheidung im elektrostatischen Feld unter Anwendung eines Hilfsgasstromes

Also Published As

Publication number Publication date
DK157903C (da) 1990-08-27
DE3165801D1 (en) 1984-10-11
ES499449A0 (es) 1982-08-16
DE3005677A1 (de) 1981-08-20
DE3005677C2 (de) 1982-06-24
EP0034278A3 (en) 1981-12-16
US4402991A (en) 1983-09-06
EP0034278A2 (fr) 1981-08-26
BR8100890A (pt) 1981-08-25
DK157903B (da) 1990-03-05
DK60381A (da) 1981-08-16
JPS56141870A (en) 1981-11-05
ES8206222A1 (es) 1982-08-16
MX149160A (es) 1983-09-07
ATE9203T1 (de) 1984-09-15
ZA81929B (en) 1982-03-31

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