EP0107030B1 - Vorrichtung und Verfahren zum elektrostatischen Überziehen von Gegenständen mit Fluiden - Google Patents

Vorrichtung und Verfahren zum elektrostatischen Überziehen von Gegenständen mit Fluiden Download PDF

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Publication number
EP0107030B1
EP0107030B1 EP83109256A EP83109256A EP0107030B1 EP 0107030 B1 EP0107030 B1 EP 0107030B1 EP 83109256 A EP83109256 A EP 83109256A EP 83109256 A EP83109256 A EP 83109256A EP 0107030 B1 EP0107030 B1 EP 0107030B1
Authority
EP
European Patent Office
Prior art keywords
globe
displacement body
coated
spray
cavity
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
EP83109256A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0107030A3 (en
EP0107030A2 (de
Inventor
Roland-Andreas Meisner
Gerd Rüdiger Dr. Kissau
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 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25805239&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0107030(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BASF Lacke und Farben AG filed Critical BASF Lacke und Farben AG
Priority to AT83109256T priority Critical patent/ATE31639T1/de
Publication of EP0107030A2 publication Critical patent/EP0107030A2/de
Publication of EP0107030A3 publication Critical patent/EP0107030A3/de
Application granted granted Critical
Publication of EP0107030B1 publication Critical patent/EP0107030B1/de
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
    • 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
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
    • B05B5/0536—Dimensional characteristics of electrodes, e.g. diameter or radius of curvature of a needle-like corona electrode
    • 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 device for electrostatically coating objects with fluids according to the preamble of claim 1 and a method for electrostatically coating objects with fluids according to the preamble of claim 13, claim 14 and claim 16.
  • bell atomizers For applying fluids, e.g. Lacquers, high-speed, so-called bell atomizers are used, which in their inner part act like a turbo machine due to their design, i.e. they suck in gas from the surrounding atmosphere, redirect it and transport it back outwards, so that a torus vortex is created inside and in front of the bell cavity.
  • the gas contains particles, e.g. B. lacquer particle oak, which are deposited on the hub plate of the bell atomizer and lead to contamination of this hub plate. Since the separated particles are not or only poorly flowable, burrs rich in solids grow on the hub plate, which after a short time - depending on their size - are thrown off the hub plate, get into the paint film guided by the bell atomizer and apply to the coating to be coated or coated object to be painted and cause considerable surface defects here. This process of soiling the hub plate and tearing off these separated burrs takes place very quickly, so that a painting process cannot usually be ended without the above-mentioned surface defects occurring.
  • particles e.g. B. lacquer particle oak
  • a generic device for electrostatically coating objects with color is known from DE-OS 32 01 753.
  • the actual spray bell consists of a single piece of material, for example an aluminum alloy, and a high potential is applied to the spray bell via a shaft.
  • the hub plate is set back with respect to the rim of the bell and the fastening device for the drive shaft is provided in the center of this hub plate, this fastening device protruding towards the front of the front face of the hub plate.
  • a reference that such a "projecting forward" is important is not to be found in this literature reference.
  • the toroidal vortex created by the formation of the spray bell inside and in front of the bell cavity transports color particles onto the hub plate and to the inside of the spray bell
  • the protruding part has such a large electrical radius in the known device that no corona discharge can occur and thus the condition of the uniformity of the particle charge and the bell charge can be met in order to utilize electrical forces close.
  • the invention has for its object to provide a device and a method for applying fluids with rapid evaporation behavior by means of a high-speed rotary bell, wherein the effect of the torus vortex and thus the contamination of the hub plate of the high-speed rotary bell is switched off.
  • a method is proposed which is characterized in that an electric field is generated in front of the bell cavity of the spray bell via a body which is electrically connected to the spray bell.
  • Another proposal according to the invention provides that in the area of the outside a a magnetic field is generated in front of the cavity of the spray bell.
  • a further proposal according to the invention provides that the aforementioned body is designed as an aerodynamic displacement body, which causes a flow around the particles flowing back in the torus vertebra.
  • the invention proposes to avoid the impact separation (separation by inertial forces) of already largely evaporated paint particles on the high-speed rotary bell in that the trajectory of the paint particles returning to the high-speed rotary bell in the region of the torus vortex is caused by electrical or magnetic or aerodynamic forces or by the Combination of the aforementioned forces is affected.
  • each of these three aforementioned options or the combination of one or more of the aforementioned options leads to high-rotation bells, with which fluids with fast evaporation behavior, e.g. B. base metallic paints, can be applied without causing contamination of the hub plate and thus tearing off these separated dirt particles from the hub plate, which would lead to disturbances in the surface of the object to be coated.
  • fluids with fast evaporation behavior e.g. B. base metallic paints
  • the spray and high rotation bell is known to be due to high voltage. This is necessary to charge the paint and to transport the sprayed paint particles to the object to be coated.
  • An aerodynamic body is attached in front of the high-speed bell, which is firmly connected to the bell in an electrically conductive manner and is therefore at the same voltage potential as the high-speed bell.
  • the particles flying back in the torus vortex either have a charge of the same polarity as the high-rotation bell or they have an opposite polarity or they are uncharged. All three possibilities can occur in the back flowing particle cloud.
  • the body in front of the high-speed rotary bell and arranged on it in a rotationally fixed manner is designed such that it flies back at a point through which the paint particles, which are preferably separated, the local field strength reaches or exceeds the breakdown field strength in the surrounding gas, so that charges are emitted .
  • the particles flying back are charged further in this charge cloud or - if the opposite polarity was originally present - reloaded.
  • Incoming uncharged particles are recharged.
  • the geometrical contour of the aerodynamic displacement body is designed in such a way that the gas flows around this body in such a way that the approaching paint particles do not have the possibility of penetrating the flow boundary layer
  • the path lines of the paint particles can also be influenced by applying an auxiliary gas flow to the aerodynamic body against the direction of the approaching paint particles, which deflects the torus vortex flow away from the contour.
  • an applied gas flow can be achieved on the entire contour of the aerodynamic body.
  • the resulting drag forces push the particles away from the aerodynamic body.
  • the individual forces or the resulting force from the combinations of these individual forces ensures that paint particles that are approaching do not hit the surface of the body and thus no contamination of the body occurs and the surface defects in the paint object to be feared up to now are thus avoided with certainty.
  • 1 denotes the bell body of a high-speed rotary bell, this bell body 1 made of an electrically conductive material, e.g. Aluminum.
  • the hub plate of this bell body 1 is designated 10.
  • the paint is supplied via a feed line 11 to the rear of the hub plate 10.
  • the paint film is passed through corresponding through-openings 12 in the hub plate to the inside of the rotary bell and spun off from the outer edge of the rotary bell, as is particularly clearly shown in FIG. 5.
  • An electrode needle 6 (FIG. 6) or an aerodynamically shaped displacer body 3 is fixed on the hub plate 10 via a receiving device 2 and is thereby connected in an electrically conductive manner to the high-speed rotary bell.
  • the receiving device 2 for connecting the electrode needle 6 or the displacer 3 with the hub plate 10 must consist of an electrically conductive material.
  • the displacer body 3 can be hollow, the cavity thus created can be filled by spacers 4 made of magnetic material.
  • An electrode needle 6 made of an electrically conductive material is arranged at the tip of the displacer body 3 or, as shown in FIG. 2, the displacer body is formed at its tip in such a way that the electrode needle 6 is created by shaping.
  • a magnet 8 is installed in the interior of the displacement body as a permanent magnet.
  • the displacer body is designed such that an auxiliary gas flow A is applied to the outside of the displacer body 3 with the support of the gas-free jet, which is directed towards the object to be coated and which leads to a deflection of the torus vortex flow, which is shown at 9 in Fig. 3.
  • the outside of the displacer 3 has the contour of a parabola, while in the embodiment according to FIG. 2 the displacer 3 has the outside contour of an inverted parabola.
  • the aerodynamic flow lines have the reference symbol X, the magnetic field lines the reference symbol Y and the electrical field lines the reference symbol Z.
  • the high-rotation bell can, for example, be at 90 kV high DC voltage and the radius of the electrode needle 6 can be 1 mm. Then a field strength of 90 kV / mm arises. Since the breakthrough field strength in air is only 3 kV / mm, the high field strength of 90 kV / mm does not arise, but a charge current arises which leads to the counter potential, i. H. For example, a vehicle body to be coated is directed and thereby generates the charge cloud.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP83109256A 1982-10-21 1983-09-19 Vorrichtung und Verfahren zum elektrostatischen Überziehen von Gegenständen mit Fluiden Expired EP0107030B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83109256T ATE31639T1 (de) 1982-10-21 1983-09-19 Vorrichtung und verfahren zum elektrostatischen ueberziehen von gegenstaenden mit fluiden.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3238917 1982-10-21
DE3238917 1982-10-21
DE19823241504 DE3241504A1 (de) 1982-10-21 1982-11-10 Vorrichtung und verfahren zum elekrtostatischen ueberziehen von gegenstaenden mit fluiden
DE3241504 1982-11-10

Publications (3)

Publication Number Publication Date
EP0107030A2 EP0107030A2 (de) 1984-05-02
EP0107030A3 EP0107030A3 (en) 1985-09-25
EP0107030B1 true EP0107030B1 (de) 1988-01-07

Family

ID=25805239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109256A Expired EP0107030B1 (de) 1982-10-21 1983-09-19 Vorrichtung und Verfahren zum elektrostatischen Überziehen von Gegenständen mit Fluiden

Country Status (7)

Country Link
US (1) US4744513A (pt)
EP (1) EP0107030B1 (pt)
AU (1) AU566090B2 (pt)
BR (1) BR8305799A (pt)
CA (1) CA1202215A (pt)
DE (2) DE3241504A1 (pt)
ES (2) ES8501642A1 (pt)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887770A (en) * 1986-04-18 1989-12-19 Nordson Corporation Electrostatic rotary atomizing liquid spray coating apparatus
US5100057A (en) * 1990-03-30 1992-03-31 Nordson Corporation Rotary atomizer with onboard color changer and fluid pressure regulator
FR2692501B1 (fr) * 1992-06-22 1995-08-04 Sames Sa Dispositif de projection electrostatique de produit de revetement liquide a tete de pulverisation rotative.
US5647543A (en) * 1995-01-31 1997-07-15 Graco Inc Electrostatic ionizing system
EP0734777A3 (en) * 1995-03-28 1997-08-20 Graco Inc Electrostatic ionization system
US5934574A (en) * 1995-12-05 1999-08-10 Van Der Steur; Gunnar Rotary atomizer
FR2776946B1 (fr) * 1998-04-01 2000-05-26 Sames Sa Bol de pulverisation et projecteur rotatif electrostatique equipe d'un tel bol
US6322011B1 (en) * 2000-03-14 2001-11-27 Illinois Tool Works Inc. Electrostatic coating system and dual lip bell cup therefor
US6409104B1 (en) 2000-04-19 2002-06-25 Ford Global Technologies, Inc. Silicon-doped amorphous carbon coating for paint bell atomizers
US6578779B2 (en) 2000-10-18 2003-06-17 Behr Systems, Inc. Rotary atomizer with bell element
DE10159588A1 (de) * 2001-12-05 2003-06-12 Duerr Systems Gmbh Glockentellerkonstruktion für Pulverzerstäuber
DE102009010248A1 (de) 2009-02-24 2010-09-02 Dürr Systems GmbH Beschichtungsvorrichtung und Beschichtungsverfahren zur Beschichtung eines Werkstücks
DE102012021218A1 (de) * 2012-10-27 2014-04-30 Volkswagen Aktiengesellschaft Lackiervorrichtung und Verfahren zum Betrieb einer Lackiervorrichtung

Citations (1)

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Publication number Priority date Publication date Assignee Title
DE3201753A1 (de) * 1981-03-09 1982-09-16 Champion Spark Plug Co., Toledo, Ohio Verfahren und vorrichtung zum aufbringen von fluessiger farbe auf gegenstaende

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US1832096A (en) * 1925-04-11 1931-11-17 Chaffee Emory Leon Electrical system
GB288904A (en) * 1926-08-31 1928-04-19 Hundertfeuer Ges Fuer Moderne Improvements in liquid spraying devices
US2607574A (en) * 1946-03-15 1952-08-19 Jr John W Hession Aerosol generator
US2896571A (en) * 1955-02-11 1959-07-28 American Can Co Spray head with protective shield
US2926106A (en) * 1956-07-16 1960-02-23 Ransburg Electro Coating Corp Apparatus and methods for electrostatic coating utilizing an inner electrode to substantially reduce the central void of the annular spray pattern
US3055592A (en) * 1956-12-17 1962-09-25 Ransburg Electro Coating Corp Liquid atomizing apparatus
US2967667A (en) * 1957-06-17 1961-01-10 Edward O Norris Electrostatic spray apparatus
US3004714A (en) * 1958-01-14 1961-10-17 Cochrane Corp Heating system
US3131091A (en) * 1960-03-08 1964-04-28 Harry S Jones Spray gun having means to control heat concentration in metal substrate
US3221992A (en) * 1962-02-08 1965-12-07 Jr John Sedlacsik Coating material motive agent atomizer head
BE629589A (pt) * 1962-03-14
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Also Published As

Publication number Publication date
AU566090B2 (en) 1987-10-08
ES8504495A1 (es) 1985-05-01
ES535228A0 (es) 1985-05-01
DE3375085D1 (en) 1988-02-11
BR8305799A (pt) 1984-05-29
US4744513A (en) 1988-05-17
EP0107030A3 (en) 1985-09-25
EP0107030A2 (de) 1984-05-02
ES526686A0 (es) 1984-12-01
AU2017883A (en) 1984-05-03
DE3241504A1 (de) 1984-04-26
ES8501642A1 (es) 1984-12-01
CA1202215A (en) 1986-03-25

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