EP1066117B1 - A rotary device for transmission of material in particulate form - Google Patents

A rotary device for transmission of material in particulate form Download PDF

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Publication number
EP1066117B1
EP1066117B1 EP98925863A EP98925863A EP1066117B1 EP 1066117 B1 EP1066117 B1 EP 1066117B1 EP 98925863 A EP98925863 A EP 98925863A EP 98925863 A EP98925863 A EP 98925863A EP 1066117 B1 EP1066117 B1 EP 1066117B1
Authority
EP
European Patent Office
Prior art keywords
bell
shaped member
air
supply means
rotary
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
EP98925863A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1066117A1 (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
Publication of EP1066117A1 publication Critical patent/EP1066117A1/en
Application granted granted Critical
Publication of EP1066117B1 publication Critical patent/EP1066117B1/en
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
    • B05B5/0415—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, i.e. the spraying being effected by centrifugal forces
    • 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.
  • EP-A-0780159 discloses an electrostatically controlled device for transmitting a beam of material in particulate form at a target surface to be coated, said device comprising a single bell-shaped member which is rotatable about a principal axis and arranged to project a conical curtain of small particles flowing generally towards such a target surface and supply means for supplying said material from a reservoir source
  • the supply means is in the form of tubing, which at its downstream end opens into the bell-shaped member.
  • 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
  • the invention provides an electrostatically controlled device for transmitting a beam of material in particulate form at a target surface to be coated, said device comprising an outer bell-shaped member which is rotatable about a principal axis and arranged to project a conical curtain of small particles flowing generally towards such a target surface, and supply means for supplying said material from a reservoir source, characterised by an inner rotary bell-shaped member provided coaxially with said outer bell-shaped member and arranged to rotate at a different rate to 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, and by a centrally located diffuser disc and deflector which are connected with said inner bell-shaped member so as to be rotatable therewith, said deflector being arranged to deflect some of said material emerging from said supply means into contact with an internal surface of said inner bell-shaped member and said diffuser disc having at least one aperture arranged so that some of said material
  • 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
  • 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, 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 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 prowded 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 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 to promote atomisation, while the inner bell shaped member incorporates a conical deflector 21 and a diffuser 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.
  • a controlled orifice which ejects the coating medium onto the deflector 21 which is revolving as part of the inner bell shaped member 23 This diverts a proportion of the medium through a controlled gap between the inner bell shaped member 23 and the diffuser disc 23A while allowing the remamder to pass through an aperture or apertures in the diffuser disc, to the front of the diffuser disc 23A
  • 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 nng 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 externally or internally generated source, and can be applied to the medium prior to, during or after atomisation
  • Hole 19 on the drawing is an access for a pin to lock the turbine to facilitate removal and replacement of the bell

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
EP98925863A 1998-03-27 1998-06-08 A rotary device for transmission of material in particulate form Expired - Lifetime EP1066117B1 (en)

Applications Claiming Priority (3)

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 1998-03-27
PCT/GB1998/001675 WO1999049983A1 (en) 1998-03-27 1998-06-08 A rotary device for transmission of material in particulate form

Publications (2)

Publication Number Publication Date
EP1066117A1 EP1066117A1 (en) 2001-01-10
EP1066117B1 true EP1066117B1 (en) 2006-01-18

Family

ID=10829474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98925863A Expired - Lifetime EP1066117B1 (en) 1998-03-27 1998-06-08 A rotary device for transmission of material in particulate form

Country Status (6)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006022057B3 (de) * 2006-05-11 2007-10-31 Dürr Systems GmbH Applikationselement für einen Rotationszerstäuber und zugehöriges Betriebsverfahren

Family Cites Families (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
GB8611460D0 (en) * 1986-05-10 1986-06-18 Case Systems Ltd Spray devices

Also Published As

Publication number Publication date
GB9806709D0 (en) 1998-05-27
JP2002509796A (ja) 2002-04-02
DE69833252D1 (de) 2006-04-06
AU7783098A (en) 1999-10-18
EP1066117A1 (en) 2001-01-10
WO1999049983A1 (en) 1999-10-07
DE69833252T2 (de) 2006-09-07
JP4162853B2 (ja) 2008-10-08

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