EP1317962B1 - Bol rotatif pour pulvérisateur à poudre - Google Patents

Bol rotatif pour pulvérisateur à poudre Download PDF

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Publication number
EP1317962B1
EP1317962B1 EP02024633A EP02024633A EP1317962B1 EP 1317962 B1 EP1317962 B1 EP 1317962B1 EP 02024633 A EP02024633 A EP 02024633A EP 02024633 A EP02024633 A EP 02024633A EP 1317962 B1 EP1317962 B1 EP 1317962B1
Authority
EP
European Patent Office
Prior art keywords
bell plate
gap
plate structure
bell
housing body
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
EP02024633A
Other languages
German (de)
English (en)
Other versions
EP1317962A1 (fr
Inventor
Thomas Dürr
Pavel Goujavin
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.)
Duerr Systems AG
Original Assignee
Duerr Systems 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 Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP1317962A1 publication Critical patent/EP1317962A1/fr
Application granted granted Critical
Publication of EP1317962B1 publication Critical patent/EP1317962B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • B05B5/0418—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces designed for spraying particulate material

Definitions

  • the invention relates to a bell cup construction for powder atomizers according to the preamble of claim 1.
  • electrostatic high-speed rotary atomizers for the serial coating of workpieces such as vehicle bodies.
  • the bell plates of well-known powder paint atomizers are made of aluminum, because this metal has both good mechanical properties Dimensional stability and relatively light weight as well as good electrostatic Properties especially with regard to the for the charging of the powder coating important ionizing ability has sharp edges.
  • a bell plate construction is already known from US Pat. No. 5,853,126 for a rotary atomizer for electrostatic series coating of workpieces with powder coating material with a hub part, the one the coating material axially leading into the bell cup Input channel contains, and with two, for example, made of PTFE plastic existing gap limiting parts known that one of the central inlet channel radially outward to the spray edge of the bell cup leading annular gap for the coating powder limit.
  • the gap limiting part which is on the the face of the bell plate facing away from the Annular gap is located on its facing away from the annular gap Back firmly with a plastic also like z.
  • a bell plate construction for an electrostatic powder atomizer with a bell body made of insulating material and one forming the end face of the bell cup Gap limiting part, which is also made of insulating material can exist, is also known from US-A 5 353 995.
  • the object of the invention is to create a for practice suitable bell plate construction, the deposits of the Coating material in the bell plate largely avoided.
  • the bell plate was wide less prone to clogging than before, if for those with the Coating powder coming into contact with surfaces at least in the Area of the annular gap is not used as previously aluminum is, but a suitable plastic, with PTFE as proves particularly well suited.
  • the plastic is certain Embodiments preferably electrically conductive (e.g. containing soot particles), but can also in other cases be non-conductive.
  • the bell plate can be in the his hub part facing away from an end in operation
  • High voltage electrode or electrode arrangement with exposed ionization ends are used.
  • This feature can also be used in others known per se Bell plate constructions without the ones described here Plastic surfaces can be an advantage.
  • the bell plate shown in Fig. 1 can with an externally threaded metallic hub part 10 in the (Not shown) hollow shaft of the turbine of a high-ration atomizer are screwed and forms the input channel 11 for the mixture supplied to the bell plate in a known manner from paint powder and transport air.
  • the input channel 11 opens at the also conventional per se generally funnel-shaped, axially forward as shown inclined and radially outward to the spray rim 12 of the bell cup extending annular gap 14.
  • the annular gap 14 is on the end face of the bell cup facing side of an annular front boundary part 16 limited, the surface of which is infinitely variable Outer surface of one enclosed by the delimiting part 16 central component 17 merges, which is shown as a tapering into the central input channel 11, with the The axis of rotation forms an axially identical tip.
  • the face of the bell plate facing away the annular gap 14 is formed by an annular rear boundary part 18 limited, that facing away from the annular gap 14 Fixed rear with a separate housing body 20 the form shown is connected.
  • the funnel-shaped relative thin outer wall of the housing body 20 extends starting from the radially outer edge area of the bell cup with a compared to the also relatively thin-walled gap limiting part 18 somewhat flatter angle against the axis of rotation, see above that a cavity 22 is formed between them, which is also radial inside by the annular hub parts 24 and 25 of the limiting part 18 or the housing body 20 is closed and serves to reduce weight.
  • the housing body 20 is with an internal thread of its hub part 25 onto the hub part 10 screwed the bell plate.
  • the rear gap limiting part 18 is positive and non-positive attached to the housing body 20 and the hub part 10.
  • the hub part 24 of the limiting part 18 between the hub part 25 of the housing body 20 and the hub part 10 screwed to it, where the hub portion 24 as shown with its radially outer Ring surface on the cylindrical inner surface of a sleeve-like axial projection of the hub part 25 and with its axial End face on an end face of the hub part facing her 25 abuts and with a radially inwardly projecting edge between the end face of the hub part 25 and one radially outwardly projecting edge of the hub part 10 sits.
  • the front gap limiting part 16 is on the rear limiting part 18 and on the associated with it in the manner described Housing body 20 with, for example, three evenly axial connecting bolts 30 distributed around the axis of rotation attached, the two boundary parts 16, 18 and between enforce them formed annular gap 14 and on their screwed rear end into the hub part 25 of the housing body 20 are.
  • the gap limiting part 16 contains the atomizer in it weight-saving cavities facing away from the front side a two-part cover or cover arrangement with a flat end face are covered.
  • the lid arrangement prevents deposits of powder on the face of the bell plate and contains a radially outer cover plate 32 with an axial inwardly offset middle part, that on the gap limiting part 16 abuts and penetrated by the connecting bolt 30 becomes.
  • a front fastening bolt 30 'of the connecting bolt 30 is supported on the radially projecting flange Retaining rings 34, the cylindrical portion 34 'coaxial with the axis of rotation inserted into the front gap limiting part 16 is.
  • the inner part of the lid assembly is covered by the already mentioned Component 17 formed which in the cylindrical part 34 ' is used and with an annular, radial to the Cover plate 32 projecting edge 17 'the fastening screw 30 'covers.
  • An insert body can be placed in the front end face of component 17 36 with a central one which is coaxial with the axis of rotation Electrode needle 37 with a tip exposed in a depression and a shaft part which projects into the component 17 his.
  • the retaining ring 34 mentioned above has i.a. the purpose of a electrically conductive connection from the electrode needle 37 on the one hand via a contact spring 38 and on the other hand via the Connecting bolt 30 and the housing body 20 to the in operation to manufacture high voltage hub part 10.
  • the gap limiting parts exist 16 and 18 and preferably also the channel limiting ring 28 made of electrically conductive PTFE material.
  • the central component 17 and the cover assembly with the front Edge 17 'and the outer cover plate 32 exist in the illustrated Example made of insulating plastic like PTFE, but the pointed inner part of the component 17 could also be made of conductive PTFE exist and if necessary with the gap limiting part 18th be one piece.
  • PTFE is because of the particularly favorable surface properties (Surface tension) of the material preferred.
  • the insert body 36 for the electrode needle 37 consists of insulating PTFE.
  • the connecting bolt 30 within the annular gap 14 by a tubular sleeve 42 enclosed, which extend into the delimiting parts 16 and 18 extends and consists of conductive or insulating PTFE, so that no powder is deposited on the bolts.
  • All other components of the bell plate construction described, in particular the hub part 10, the housing body 20, the connecting bolts 30 and the retaining ring 34 are made on the other hand, made of stable and electrically conductive metal.
  • At least the housing body 20 can in particular be made of aluminum consist.
  • the required electrostatic charge of the coating powder takes place first inside the bell plate, i.e. in the Input channel 11 of the high-voltage hub part 10 and in the gap limiting parts electrically connected to it 16 and 18 made of conductive PTFE. Outside the bell plate becomes the coating powder emerging at the spray edge 16 mainly due to the known ionization effect the sharp metallic edge 42 charged at the illustrated Example at the radially outermost end of the housing body 20 between its outer surface, which with the neighboring conical outer surface of the gap limiting part 18 continuously can align, and the adjacent radial End face of the housing body 20 is formed.
  • the central front electrode needle 37 ensures ionization.
  • the one used PTFE material is not necessarily conductive even at the annular gap 14 his.
  • annular gap is in one piece in this embodiment shaped with the tapered central part 117 and forms as shown the central part 136 of the face of the bell cup without the insert body 36 according to the embodiment Fig. 1.
  • the central electrode needle 37 are in this Embodiment, for example, two, three or more electrode needles 137 with axially exposed tips on one Pitch circle coaxial with the bell plate axis with uniform Angular distances distributed in the face of the bell cup used. They are shown between the central one Part 136 and the cover plate 132 also provided here and similar to the embodiment of FIG. 1 over the metallic Retaining ring 134 and the bell plate construction holding together axial connecting bolt 130 electrically conductive connected to the hub portion 110.
  • an eccentric electrode arrangement should preferably uniform at high speeds of the bell cup Have mass distribution with respect to the axis, so that cancel the radial forces and avoid imbalance. With two or more electrodes, for example, by the above Arrangement achieved with even angular distances become. Eccentric electrodes can also be used in addition to the central electrode needle 37 may be useful.
  • An eccentric electrode arrangement rotating with the bell cup has opposite the central needle electrode 37 in Fig. 1 the advantage that they less due to centrifugal forces tends to get dirty. It can also face each other the field concentration at a central needle electrode a better and more uniform field distribution and thus a improved spray cone result.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Glanulating (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (16)

  1. Structure de bol rotatif pour pulvérisateur de poudre pour le revêtement en série de pièces avec un matériau de revêtement pulvérulent, comportant un moyeu (10) qui contient un canal d'entrée (11) central guidant axialement le matériau de revêtement dans le bol rotatif, et comportant deux parties de délimitation de fente (16, 18) qui délimitent une fente annulaire (14) guidant le matériau de revêtement depuis le canal d'entrée (11) central radialement vers l'extérieur, vers le bord de pulvérisation (12) du bol rotatif, au moins les surfaces, délimitant la fente annulaire (14), des deux parties de délimitation de fente (16, 18) étant en matière plastique, caractérisée en ce que la partie arrière de délimitation de fente (18), constituée en matière plastique, qui se trouve sur le côté de la fente annulaire (14) tourné à l'opposé de la face frontale du bol rotatif, est solidaire, sur sa face arrière tournée à l'opposé de la fente annulaire, d'un corps de boítier (20) qui est en métal et qui s'étend jusqu'à proximité de l'extrémité radialement extérieure de la partie de délimitation de fente (18).
  2. Structure de bol rotatif selon la revendication 1, caractérisée en ce que les parties de délimitation de fente (16, 18) sont constituées en une matière plastique électriquement conductrice.
  3. Structure de bol rotatif selon la revendication 1, caractérisée en ce que les parties de délimitation de fente (16, 18) sont en matière plastique isolante.
  4. Structure de bol rotatif selon les revendications 1, 2 ou 3, caractérisée en ce que la matière plastique est du PTFE.
  5. Structure de bol rotatif selon l'une des revendications précédentes, caractérisée en ce que la partie avant de délimitation de fente (16), tournée vers la face frontale du bord rotatif, est fixée, par des boulons métalliques (30) traversant axialement la fente annulaire (14), à une partie (25) du corps de boítier (20) métallique, reliée au moyeu (10), et en ce que les parties des boulons (30), se trouvant dans la fente annulaire (14), sont enfermées chacune par une douille (42) en matière plastique.
  6. Structure de bol rotatif selon l'une des revendications précédentes, caractérisée en ce que le corps de boítier (20) métallique et le moyeu (10) sont vissés ensemble et fixent entre eux la partie arrière de délimitation de fente (18).
  7. Structure de bol rotatif selon l'une des revendications précédentes, caractérisée en ce que la partie arrière de délimitation de fente (18) est fixée, à proximité de son extrémité radialement extérieure, par une liaison à encliquetage (26), au corps de boítier (20) métallique.
  8. Structure de bol rotatif selon l'une des revendications précédentes, caractérisée en ce que le corps de boítier (20) métallique forme, à proximité du bord de pulvérisation (12), un bord d'ionisation (42) sur sa surface extérieure conique alignée avec la surface extérieure de la partie arrière de délimitation de fente (18).
  9. Structure de bol rotatif selon l'une des revendications précédentes, caractérisée en ce qu'au moins la partie centrale de la surface frontale du bol rotatif est formée par un dispositif de recouvrement (17', 32) en matériel isolant inséré dans la partie de délimitation de fente (16) tournée vers la surface frontale.
  10. Structure de bol rotatif selon l'une des revendications précédentes, caractérisée en ce que la partie avant de délimitation de fente (16), qui se trouve sur le côté de la fente tourné vers la surface frontale du bol rotatif, forme, sur son côté tourné vers la fente annulaire (14), une pointe dont l'axe est identique à l'axe de rotation et qui pénètre en se rétrécissant dans le canal d'entrée central (11), ou enferme un composant (17) formant cette pointe, constitué de la matière plastique.
  11. Structure de bol rotatif selon l'une des revendications précédentes, caractérisée en ce qu'une cavité (22) fermée est formée entre la partie arrière de délimitation de fente (18) et le corps de boítier métallique (20) sous la plus grande partie de la surface extérieure conique du corps de boítier (20).
  12. Structure de bol rotatif selon l'une des revendications précédentes, caractérisée en ce qu'elle est constituée de deux moitiés reliées entre elles par des boulons de liaison (30) axiaux dont la moitié arrière contient la partie arrière de délimitation de fente (18) en matière plastique, le corps de boítier (20) métallique et le moyeu (10) métallique servant au montage dans le pulvérisateur, tandis que la moitié avant contient la partie avant de délimitation de fente (16, 17) en matière plastique et un dispositif de recouvrement (17', 32) formant la surface frontale du bol rotatif.
  13. Structure de bol rotatif selon l'une des revendications précédentes, caractérisée en ce qu'au moins une électrode (37, 137) est insérée, par une extrémité d'ionisation dégagée extérieurement, dans une surface frontale du bol rotatif, tournée à l'opposé du moyeu (10, 110).
  14. Structure de bol rotatif selon les revendications 12 et 13, caractérisée en ce que l'électrode (37, 137) est reliée électriquement au moyeu (10, 110) par au moins l'un des boulons de liaison (30, 130) axiaux.
  15. Structure de bol rotatif selon l'une des revendications 12 à 14, caractérisée en ce qu'une aiguille d'électrode centrale (37) est insérée dans le dispositif de recouvrement (17') avec sa pointe dégagée vers l'extérieur.
  16. Structure de bol rotatif selon l'une des revendications 12 à 14, caractérisée en ce qu'une ou plusieurs électrodes (137) sont éventuellement réparties sur un cercle ou cercle primitif coaxial à l'axe du bol rotatif.
EP02024633A 2001-12-05 2002-11-04 Bol rotatif pour pulvérisateur à poudre Expired - Lifetime EP1317962B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10159588 2001-12-05
DE10159588A DE10159588A1 (de) 2001-12-05 2001-12-05 Glockentellerkonstruktion für Pulverzerstäuber

Publications (2)

Publication Number Publication Date
EP1317962A1 EP1317962A1 (fr) 2003-06-11
EP1317962B1 true EP1317962B1 (fr) 2004-07-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02024633A Expired - Lifetime EP1317962B1 (fr) 2001-12-05 2002-11-04 Bol rotatif pour pulvérisateur à poudre

Country Status (4)

Country Link
EP (1) EP1317962B1 (fr)
AT (1) ATE270925T1 (fr)
DE (2) DE10159588A1 (fr)
ES (1) ES2223024T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008056411A1 (de) 2008-11-07 2010-05-20 Dürr Systems GmbH Beschichtungsanlagenbauteil, insbesondere Glockenteller, und entsprechendes Herstellungsverfahren

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004017891B3 (de) * 2004-04-13 2005-11-10 Daimlerchrysler Ag Glockenteller für Rotationszerstäuber von Lacken
DE102004032045A1 (de) * 2004-07-02 2006-01-26 J. Wagner Ag Rotationszerstäuber

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3241504A1 (de) * 1982-10-21 1984-04-26 Basf Farben + Fasern Ag, 2000 Hamburg Vorrichtung und verfahren zum elekrtostatischen ueberziehen von gegenstaenden mit fluiden
FR2692173B1 (fr) * 1992-06-10 1994-09-02 Sames Sa Dispositif de projection électrostatique d'un produit de revêtement en poudre à tête d'ionisation tournante.
DE9315890U1 (de) * 1993-10-19 1994-03-31 Hestermann, Gerhard, 88048 Friedrichshafen Pulversprühorgan
US5632448A (en) * 1995-01-25 1997-05-27 Ransburg Corporation Rotary powder applicator
US6105886A (en) * 1995-05-19 2000-08-22 Nordson Corporation Powder spray gun with rotary distributor
US5853126A (en) * 1997-02-05 1998-12-29 Illinois Tool Works, Inc. Quick disconnect for powder coating apparatus
US5957395A (en) * 1997-10-21 1999-09-28 Illinois Tool Works Inc. Safe charging
US6189804B1 (en) * 1998-03-27 2001-02-20 Behr Systems, Inc. Rotary atomizer for particulate paints
FR2791279B1 (fr) * 1999-03-25 2002-03-29 Sames Sa Dispositif de projection d'un produit de revetement en poudre et organe de projection equipant un tel dispositif
US6578779B2 (en) * 2000-10-18 2003-06-17 Behr Systems, Inc. Rotary atomizer with bell element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008056411A1 (de) 2008-11-07 2010-05-20 Dürr Systems GmbH Beschichtungsanlagenbauteil, insbesondere Glockenteller, und entsprechendes Herstellungsverfahren

Also Published As

Publication number Publication date
DE50200622D1 (de) 2004-08-19
EP1317962A1 (fr) 2003-06-11
ES2223024T3 (es) 2005-02-16
DE10159588A1 (de) 2003-06-12
ATE270925T1 (de) 2004-07-15

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