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WO1999049983A1 - Dispositif rotatif de transmission de matiere sous forme particulaire - Google Patents

Dispositif rotatif de transmission de matiere sous forme particulaire Download PDF

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Publication number
WO1999049983A1
WO1999049983A1 PCT/GB1998/001675 GB9801675W WO9949983A1 WO 1999049983 A1 WO1999049983 A1 WO 1999049983A1 GB 9801675 W GB9801675 W GB 9801675W WO 9949983 A1 WO9949983 A1 WO 9949983A1
Authority
WO
WIPO (PCT)
Prior art keywords
bell
shaped member
air
rotary
transmitting
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.)
Ceased
Application number
PCT/GB1998/001675
Other languages
English (en)
Inventor
John David Stratton
Robert Dennis Taylor
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.)
Rdt Advanced Painting Technology Ltd
Westwind Air Bearings Ltd
Original Assignee
Rdt Advanced Painting Technology Ltd
Westwind Air Bearings Ltd
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 Rdt Advanced Painting Technology Ltd, Westwind Air Bearings Ltd filed Critical Rdt Advanced Painting Technology Ltd
Priority to EP98925863A priority Critical patent/EP1066117B1/fr
Priority to AU77830/98A priority patent/AU7783098A/en
Priority to DE69833252T priority patent/DE69833252T2/de
Priority to JP2000540941A priority patent/JP4162853B2/ja
Publication of WO1999049983A1 publication Critical patent/WO1999049983A1/fr
Priority to US09/744,664 priority patent/US7055768B1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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 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
    • B05B5/0415—Driving means; Parts thereof, e.g. turbine, shaft, bearings
    • 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
    • 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
    • B05B3/1092—Means for supplying shaping gas
    • 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
    • B05B5/0426—Means for supplying shaping gas
    • 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
    • B05B5/0531—Power generators

Definitions

  • the present invention relates to rotary devices for transmitting material in particulate form particularly for deposition on a surface.
  • the material may be a solid, a liquid, a gel, a powder or a suspension when supplied, but is or becomes particulate when airborne.
  • Rotary devices are known, for example electrostatically controlled atomising paint spraying devices, where the material to be deposited is forced through a high speed rotary bell-shaped outlet which atomises and directs the material as a conical beam onto a surface while assisted by a high voltage electrostatic charge between the surface and the particles .
  • the material to be deposited such as paint
  • a conical or cylindrical curtain of high velocity air can be supplied so as to encircle the emerging conical beam or mist of atomised particles . This constrains the beam so as to re-shape the beam into a more closely confined and accurate spray.
  • supply means for supply of material from a reservoir source and centrally outwards from said principal axis and towards a peripheral internal shaping region of said outer bell-shaped member to create said conical curtain of small particles
  • an inner rotary bell-shaped member is provided co-axially with said outer bell-shaped member and is arranged to rotate at a different rate to that of said outer bell-shaped member so that at least a major part of the material emerging from said supply means is subject to differing rotary forces imparted by both the inner and outer rotary bell-shaped members.
  • an inner surface of the outer bell-shaped member in an operative region where it receives emergent material for atomisation should be roughened. Also it is desirable that the outer bell- shaped member should in its operative region extend outwardly of the inner bell-shaped member.
  • the two bell-shaped members will rotate in opposing directions, but that is not always to be preferred. In some cases rotation in the same direction but at significantly different rates will be effective.
  • Another advantage is that the difference in speeds of the two bell-shaped members can be adjusted if desired in order to optimise performance of the device. If this is required, the two bell-shaped members should be independently adjustable in speed.
  • a centrally located diffuser disc is provided 5 externally to said supply means and perpendicular to said principal axis and includes a centrally located deflector which deflects at least some of the emergent material into contact with an internal surface of said inner bell- shaped member and thence to an internal surface of the outer bell-shaped member.
  • the rotary diffuser disc may be integral with the inner bell-shaped member so as to rotate integrally with it.
  • the remainder of said material is arranged to be passed through apertures in said disc and onto an external face of said disc and then to be fed centrifugally into the region of said peripheral internal shaping region of said outer bell- shaped member.
  • the two rotary bell-shaped members can be rotated by any suitable driven rotor system, but the use of air pressure is particularly convenient.
  • the bell-shaped members can form part of, in each case, an air turbine.
  • air bearings utilising air under pressure can, if desired, be used to support rotation of the rotary parts of the device.
  • these bearings should be supplied with air separately from the air turbines to avoid undesired interactions, that is separate conduits are provided for the air turbines and for the bearings .
  • the device operates most effectively when there is a high voltage electrostatic charge between the particles and their target. This can, if desired, be achieved by earthing the target and applying a high voltage to the emerging particles or to the material prior to its becoming particulate.
  • the voltages required can be generated internally within the device. If a rotary member carries conductors or magnets and a static part of the device carries the converse, an electric generator arises and the resultant generated voltage can be arranged to charge the particles.
  • the device is of particular advantage when used in a painting (coating) tool with two turbines incorporating the bell-shaped members and driven by compressed air, 7 which enclose a central tube carrying the deposition material which is then forced outwardly towards the turbines .
  • Both bell-shaped members produce a form of centrifugal acceleration of the paint particles which are at least partially atomised as they strike against the inner surfaces of the bell-shaped members .
  • the atomised particles are then propelled in the general direction of the object to be painted (coated) .
  • the resulting coating has a characteristically very smooth and even surface profile.
  • Both turbines are supported preferably on air bearings.
  • the compressed air can be fed to each turbine through an inlet or inlets in the casing and which then exits to atmosphere, and can be supplied separately and in parallel, in each case to a hollow cylinder bearing downstream from the turbine drive in a parallel operation which also exits to atmosphere.
  • the cylinders are of plastics or ceramic materials.
  • the components carrying the coating medium may be in the form of a ceramic, metal or composite outer casing having suitably selected surface properties .
  • the figure shows a longitudinal section through a coating 9 tool.
  • the surface to be painted is labelled 1, and is located at a distance from the tool which is dependent on the application parameters to be used.
  • the tool essentially comprises a central tube 2, which carries a coating medium which has been supplied from an external supply source, an inner turbine 3 an outer turbine 4, together with supporting bearings (in this case air bearings) 10 and 11 and a fixed casing 5.
  • Both turbines are driven by compressed air which passes from the rear of the casing via conduits to the turbine blades 8 and 9, through separate supply holes. Similar supply connections and conduits are provided for reverse or braking motion of the turbines 8A and 9A.
  • the impact surfaces of the turbine blades 8 and 9 are so arranged that the turbines 3 and 4 rotate in a counter direction to one another.
  • the bearings provide both axial and radial support for the turbines by the use of air, supplied from a connection on the housing through numerous controlled conduits or passageways 15 and 13, quite separate from and in parallel with the conduits for the turbines, to accurately controlled voids between the static and rotating surfaces .
  • the air then exhausts 1 through passage 6.
  • the turbines 3 and 4, thus supported are centred and free to rotate on air bearings while having no physical contact with each other or their bearings, or the casing 5.
  • bell shaped members 23 and 24 Carried at the ends of the turbines 3 and 4 are bell shaped members 23 and 24. These are arranged so as to rotate concentrically, with the end of the inner bell shaped member 23 being inside the outer bell shaped member 24, and the outer bell-shaped member extending beyond the front edge of the inner bell-shaped member.
  • the outer bell shaped member has an inner surface, at its end which is of a selected shape and roughness 24A to promote atomisation, while the inner bell shaped member incorporates a conical diffuser 21 and a transfer disc 23A, which are integral with the inner bell-shaped member and therefore rotate integrally with it.
  • the roughened surface of the outer bell-shaped member should extend from a region opposite the tip of the inner bell-shaped member to the outermost end, or tip, of the outer bell-shaped member.
  • the medium passes, either side of the transfer disc, to be thrown from the tip in a generally radial trajectory 26.
  • the spray thus produced now impinges on the roughened inner surface of the outer bell shaped member 24A which has the effect of "atomising” and shaping the trajectory of the droplets .
  • the cone of mist may then be subjected to the effects of shaping from the air curtain produced by the controlled passage of air through a shaping air ring 27, via supply line 27A.
  • This electrostatic charge can be applied outside the tool (via electrodes penetrating the mist) or inside via a connection to the paint tube from an 12 externally or internally generated source, and can be applied to the medium prior to, during or after atomisation.
  • Various other features may be included in the tool, such as speed indication (and control via external equipment) . This is achieved by the feedback of optical, electrical, pneumatic or audible signals to a suitable output device from the turbines .

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Abstract

L'invention porte sur un dispositif de transmission d'un faisceau de matière se présentant sous forme particulaire, ce dispositif pouvant être utilisé par exemple comme pulvérisateur à peinture de particules atomisées. Ce dispositif comprend un élément externe (24) en forme de cloche pouvant tourner autour d'un axe principal et disposé de façon à projeter un rideau conique de petites particules s'écoulant généralement vers une cible; un dispositif d'alimentation amenant la matière provenant d'un réservoir source et la dirigeant centralement vers l'extérieur depuis l'axe principal, et vers une région périphérique interne de l'élément externe en forme de cloche de façon à créer un rideau conique de petites particules. Ce dispositif comprend également un élément (23) rotatif interne en forme de cloche qui est ménagé coaxialement à l'élément externe et disposé de façon à tourner à une vitesse différente de celle de l'élément externe de sorte qu'au moins une grande partie de la matière sortant du dispositif d'alimentation soit soumise à différences forces rotatives conférées par les éléments (23, 24) interne et externe en forme de cloche, ces éléments étant de préférence entraînés par un conduit d'alimentation en air séparé du conduit des paliers (10, 11) pneumatiques supportant les éléments rotatifs en forme de cloche.
PCT/GB1998/001675 1997-05-23 1998-06-08 Dispositif rotatif de transmission de matiere sous forme particulaire Ceased WO1999049983A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP98925863A EP1066117B1 (fr) 1998-03-27 1998-06-08 Dispositif rotatif de transmission de matiere sous forme particulaire
AU77830/98A AU7783098A (en) 1998-03-27 1998-06-08 A rotary device for transmission of material in particulate form
DE69833252T DE69833252T2 (de) 1998-03-27 1998-06-08 Rotierende vorrichtung zur abgabe von teilchenförmigem material
JP2000540941A JP4162853B2 (ja) 1998-03-27 1998-06-08 粒子形状の材料を送達するための回転式装置
US09/744,664 US7055768B1 (en) 1997-05-23 2000-09-18 Rotary device for transmission of material in particulate form

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9806709.3A GB9806709D0 (en) 1998-03-27 1998-03-27 A rotary device for transmission of material in particulate form
GB9806709.3 1998-03-27

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/744,664 Continuation US7055768B1 (en) 1997-05-23 2000-09-18 Rotary device for transmission of material in particulate form

Publications (1)

Publication Number Publication Date
WO1999049983A1 true WO1999049983A1 (fr) 1999-10-07

Family

ID=10829474

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/001675 Ceased WO1999049983A1 (fr) 1997-05-23 1998-06-08 Dispositif rotatif de transmission de matiere sous forme particulaire

Country Status (6)

Country Link
EP (1) EP1066117B1 (fr)
JP (1) JP4162853B2 (fr)
AU (1) AU7783098A (fr)
DE (1) DE69833252T2 (fr)
GB (1) GB9806709D0 (fr)
WO (1) WO1999049983A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007131661A1 (fr) * 2006-05-11 2007-11-22 Dürr Systems GmbH Élément d'application pour un pulvérisateur rotatif et procédé de fonctionnement associé

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473035A (en) * 1945-11-02 1949-06-14 Western Condensing Co Spray device
FR1224667A (fr) * 1958-05-21 1960-06-27 Bayer Ag Procédé et dispositif pour pulvériser des masses plastiques
FR1274814A (fr) * 1960-11-05 1961-10-27 Procédé et appareil de pulvérisation
FR1472066A (fr) * 1965-09-30 1967-03-10 Neu Sa Perfectionnement aux dispositifs de pulvérisation de liquide dans de l'air ou dans un gaz
JPS5511064A (en) * 1978-07-12 1980-01-25 Toyota Motor Corp Rotary type electrostatic coater for conductive paint
EP0246032A2 (fr) * 1986-05-10 1987-11-19 C.A.S.E. Systems Limited Appareil et système de pulvérisation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473035A (en) * 1945-11-02 1949-06-14 Western Condensing Co Spray device
FR1224667A (fr) * 1958-05-21 1960-06-27 Bayer Ag Procédé et dispositif pour pulvériser des masses plastiques
FR1274814A (fr) * 1960-11-05 1961-10-27 Procédé et appareil de pulvérisation
FR1472066A (fr) * 1965-09-30 1967-03-10 Neu Sa Perfectionnement aux dispositifs de pulvérisation de liquide dans de l'air ou dans un gaz
JPS5511064A (en) * 1978-07-12 1980-01-25 Toyota Motor Corp Rotary type electrostatic coater for conductive paint
EP0246032A2 (fr) * 1986-05-10 1987-11-19 C.A.S.E. Systems Limited Appareil et système de pulvérisation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 038 (C - 004) 27 March 1980 (1980-03-27) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007131661A1 (fr) * 2006-05-11 2007-11-22 Dürr Systems GmbH Élément d'application pour un pulvérisateur rotatif et procédé de fonctionnement associé
US7837135B2 (en) 2006-05-11 2010-11-23 Durr Systems Gmbh Application element for a rotary sprayer and associated operating method
CN101443127B (zh) * 2006-05-11 2013-08-28 杜尔系统有限责任公司 用于旋转喷雾器的涂覆元件和所属的工作方法

Also Published As

Publication number Publication date
DE69833252D1 (de) 2006-04-06
AU7783098A (en) 1999-10-18
EP1066117A1 (fr) 2001-01-10
JP4162853B2 (ja) 2008-10-08
DE69833252T2 (de) 2006-09-07
GB9806709D0 (en) 1998-05-27
JP2002509796A (ja) 2002-04-02
EP1066117B1 (fr) 2006-01-18

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