EP0800868A1 - Système de dispersion pour un pulvérisateur de poudre - Google Patents

Système de dispersion pour un pulvérisateur de poudre Download PDF

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Publication number
EP0800868A1
EP0800868A1 EP97105590A EP97105590A EP0800868A1 EP 0800868 A1 EP0800868 A1 EP 0800868A1 EP 97105590 A EP97105590 A EP 97105590A EP 97105590 A EP97105590 A EP 97105590A EP 0800868 A1 EP0800868 A1 EP 0800868A1
Authority
EP
European Patent Office
Prior art keywords
powder
air
dispersing device
control air
outlet
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.)
Granted
Application number
EP97105590A
Other languages
German (de)
English (en)
Other versions
EP0800868B1 (fr
Inventor
Enar Ahlbert
Johann Dr. Nienburg
Lars-Erik Johansson
Anton Puhane
Gunter Dr. Börner
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.)
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
Original Assignee
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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 ABB Research Ltd Switzerland, ABB Research Ltd Sweden filed Critical ABB Research Ltd Switzerland
Publication of EP0800868A1 publication Critical patent/EP0800868A1/fr
Application granted granted Critical
Publication of EP0800868B1 publication Critical patent/EP0800868B1/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
    • 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
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/008—Accessories or implements for use in connection with applying particulate materials to surfaces; not provided elsewhere in B05C19/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/12—Applying particulate materials

Definitions

  • the invention relates to a method and a dispersing device for designing a powder cloud which arises when a powder / air mixture emerges from a powder spraying device.
  • the dispersing device is particularly suitable for spray devices in which a powder / air mixture emerges from a fluidization chamber through a nozzle; however, it can also be used in other systems, such as a spray device in which a powder / air mixture is fed to the dispersing device via a hose.
  • EP A1 0574 305 proposes a dispersing system with a rapidly rotating disc, using speeds above 3000 rpm.
  • such systems are mechanically sensitive and have a limited service life in powder spraying devices.
  • Another disadvantage of the two aforementioned spray devices is that no flat nozzles can be used to generate a flat powder jet.
  • the invention is therefore based on the object of specifying a method and a dispersing device which allow different configurations of the spray cloud, also relatively large widespread spray clouds, no rotating parts being used, and powder deposits in the dispersing device are avoided.
  • This object is achieved in a method for forming a powder cloud according to the preamble of claim 1 by its characterizing features.
  • a stream of compressed air is directed onto a powder / air stream in the tangential direction within a hollow body.
  • the powder / air flow thus provided with a swirl expands after it emerges from the powder spray cloud.
  • a powder / air mixture flows through a hollow body.
  • the wall of the hollow body has bores through which one or more streams of compressed air can be introduced tangentially.
  • a powder / air stream flowing from a nozzle hits the tip of a conical baffle and flows along the cone shell an outlet.
  • the powder / air flow is guided through an annular gap which is formed by the cone jacket and a funnel-shaped guide wall spaced apart therefrom.
  • annular channel In the area of the inlet nozzle there is an annular channel with several bores through which a controlling compressed air can be directed onto the powder / air flow in the tangential direction.
  • this control air can also be introduced through bores in the funnel-shaped guide wall.
  • the powder spray cloud shape is not determined solely by the structural design, but can also be changed during operation by changing the control air supply. It can also be used with a flat nozzle. Powder deposits in the dispersing device are largely avoided.
  • the helical movement of the powder particles in the powder cloud, achieved with the dispersing device, leads the powder particles close to the high-voltage electrodes with a high probability and thereby causes an improved electrostatic charge, which in turn leads to an improved deposition of powder on a workpiece.
  • FIG. 1 shows a schematic representation of a section through a fluidization container 2, only a section of the container 2, which is closed per se is shown.
  • the container 2 there is fluidized powder 8, which can be removed from the fluid bed with the aid of a removal tube 25 and controlled by a closing device 13.
  • the locking device 13 consists of a tube opening into the extraction tube 25, through which compressed air can be introduced, which in the closed state forces fluidized powder 8 back into the container 2.
  • the fluidized powder 8 enters through a nozzle 11 as a powder / air stream 16 into a dispersing device 1.
  • the dispersing device 1 is designed as a cavity 3, which is formed by a tube 4, the nozzle 11 as an inlet for the fluidized powder 8 and by an outlet 12.
  • the cavity 3 can also have a different geometry, for. B. a cone can be used instead of a tube 4, the nozzle 11 being arranged at the beginning of the cone with the smaller diameter.
  • the tube 4 In the tube 4, several holes 5 are made, which are distributed in a row over the circumference of the tube; there can also be several such rows with bores 5 one after the other in the axial direction, i. H. in the spray direction.
  • the design of the bores 5 can be seen more clearly from the sectional illustration A-A. They are designed so that compressed air introduced into the cavity 3 through the bores 5 tangentially contacts the powder / air stream 16 as control air 6. As a result, a helical movement of the powder / air stream 16, which increases toward the outlet 12, is formed.
  • the outlet 12 can be designed to expand in a funnel shape, as a result of which - supported by the centrifugal force of the powder particles in rotation - forms an expanding powder cloud 15.
  • the dispersing device 1 is double-walled, thereby creating an outer chamber 7 into which the control air 6 is fed via a feed line 9 and from which the control air 6 can be introduced into the cavity 3 through the bores 5.
  • the powder particles are charged with the aid of high-voltage electrodes 14 outside the outlet region 12.
  • the shape of the powder cloud 15 can be influenced not only during operation by the supply of control air, but also by the choice and optimization of the geometry of the dispersing device.
  • Some essential parameters are given in Fig. 2 . These parameters are the length L 2 , measured from the - possibly first - inlet point 5 for control air 6 and the start of the outlet 12, the distance L 1 between the nozzle 11 and the inlet point 5, the diameter D1 of the tube 4, the diameter D2 the funnel-shaped expansion of the outlet 12, the opening angle ⁇ 1 of the funnel-shaped expansion, the opening diameter D 3 of the nozzle 11, the diameter D 4 of the bores 5 and the number of bores 5.
  • Fluidized powder 8 is introduced into the dispersing device in the axial direction via a nozzle 11.
  • the powder / air flow 16 generated by the nozzle 11 strikes the tip of a large conical baffle 17 just behind the nozzle 11.
  • the powder / air flow 16 flows along the jacket of the conical baffle 17 to an outlet 12.
  • the expanding powder / air flow 16 is guided through a guide wall 18 adapted to the cone shape.
  • the guide wall 18 is part of a feed channel 19 into which control air 6 is introduced via a feed line 9, which flows out tangentially toward the powder / air stream 16 via bores 5, which are shown in the sectional drawing by a sectional plane AA.
  • control air 6 can also be directed via an annular channel 20 in the axial direction, but also tangentially to the powder / air stream 16.
  • the control channel 6 is supplied to the annular channel 20 via a second supply line 21, which air exits through bores 22.
  • the control air 6 coming from the annular channel 20 through the bores 22 tangentially onto the powder / air stream 16 accelerates the powder / air stream 16 in the axial direction on the one hand and also sets it in a rotating movement.
  • High-voltage electrodes 14 are arranged in the outlet region 12.
  • the powder cloud 15 emerging from the slit-shaped outlet 12 is particularly effective due to its helical movement charged.
  • the shape of the powder cloud 15 can be influenced by the control air 6 supplied to the two feed lines 9 and 21.
  • the proposed dispersing device of the first and second variant or the method proposed at the same time for influencing the shape of the emerging powder cloud are therefore particularly suitable as a dispersing device for a spraying device which works with a powder / air mixture with a high proportion of powder, such as that in FIG. 1 indicated spraying device.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Separation Of Particles Using Liquids (AREA)
EP97105590A 1996-04-10 1997-04-04 Système de dispersion pour un pulvérisateur de poudre Expired - Lifetime EP0800868B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19614192A DE19614192A1 (de) 1996-04-10 1996-04-10 Dispergiersystem für eine Pulversprüheinrichtung
DE19614192 1996-04-10

Publications (2)

Publication Number Publication Date
EP0800868A1 true EP0800868A1 (fr) 1997-10-15
EP0800868B1 EP0800868B1 (fr) 1999-03-03

Family

ID=7790913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97105590A Expired - Lifetime EP0800868B1 (fr) 1996-04-10 1997-04-04 Système de dispersion pour un pulvérisateur de poudre

Country Status (6)

Country Link
EP (1) EP0800868B1 (fr)
JP (1) JP4018192B2 (fr)
KR (1) KR970069152A (fr)
DE (2) DE19614192A1 (fr)
DK (1) DK0800868T3 (fr)
ES (1) ES2131421T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002078854A1 (fr) * 2001-03-28 2002-10-10 Ines Urbani Dispositif destine au revetement electrostatique avec une fente double pour emission de poudre, notamment au revetement de bobines metalliques

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10138917A1 (de) 2001-08-08 2003-03-06 Itw Gema Ag Pulversprühbeschichtungsvorrichtung
DE10261978B3 (de) * 2002-01-18 2004-11-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Pulversprühvorrichtung und Verfahren
US6874712B2 (en) * 2002-09-27 2005-04-05 Abb Inc. Swirl gun for powder particles

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH641691A5 (en) * 1979-06-09 1984-03-15 Gema Ransburg Ag Atomising method and atomising apparatus
WO1988006493A1 (fr) * 1987-02-28 1988-09-07 Hirt Combustion Engineers Ltd. Pulverisateur
DE3725672A1 (de) * 1987-08-03 1989-02-16 Marresearch Druckluftblaseinrichtung
US5188296A (en) * 1990-04-02 1993-02-23 Stein Industrie Pulp dispersion lance
US5322222A (en) * 1992-10-05 1994-06-21 Lott W Gerald Spiral jet fluid mixer

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879003A (en) * 1956-09-24 1959-03-24 Finn Equipment Company Nozzles for spraying aqueous solutions containing a high percentage of solids
FR92033E (fr) * 1967-03-22 1968-09-13 Sames Mach Electrostat Appareil nouveau et perfectionné pour le poudrage électrostatique d'objets
DE1475162A1 (de) * 1964-11-28 1969-01-23 Sem Bjarne Spritzmundstueck
US3310240A (en) * 1965-01-07 1967-03-21 Gen Motors Corp Air atomizing nozzle
IT992150B (it) * 1973-05-29 1975-09-10 Turbosol A I Srl Testina spruzzatrice di impasti cementizi per l applicazione mec canica di intonaci
US3901184A (en) * 1974-07-23 1975-08-26 Continental Can Co Pneumatic powder flow diverting device
US3940061A (en) * 1974-09-16 1976-02-24 Champion Spark Plug Company Electrostatic spray gun for powder coating material
DE3014133C2 (de) * 1980-04-12 1984-04-19 Ransburg-Gema AG, 9015 St.Gallen Vorrichtung zum Zerstäuben von Pulver
DE3242362A1 (de) * 1982-11-16 1984-05-17 Hestermann, Gerhard, 7990 Friedrichshafen Verfahren und vorrichtung zum gerichteten auftragen pulverfoermiger anstrichstoffe
DE3644849A1 (de) * 1986-03-13 1987-09-17 Gema Ransburg Ag Elektrostatische sprueheinrichtung fuer beschichtungspulver
US5297733A (en) * 1991-09-16 1994-03-29 Plastic Flamecoat Systems, Inc. Flame spray gun

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH641691A5 (en) * 1979-06-09 1984-03-15 Gema Ransburg Ag Atomising method and atomising apparatus
WO1988006493A1 (fr) * 1987-02-28 1988-09-07 Hirt Combustion Engineers Ltd. Pulverisateur
DE3725672A1 (de) * 1987-08-03 1989-02-16 Marresearch Druckluftblaseinrichtung
US5188296A (en) * 1990-04-02 1993-02-23 Stein Industrie Pulp dispersion lance
US5322222A (en) * 1992-10-05 1994-06-21 Lott W Gerald Spiral jet fluid mixer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002078854A1 (fr) * 2001-03-28 2002-10-10 Ines Urbani Dispositif destine au revetement electrostatique avec une fente double pour emission de poudre, notamment au revetement de bobines metalliques

Also Published As

Publication number Publication date
KR970069152A (ko) 1997-11-07
EP0800868B1 (fr) 1999-03-03
ES2131421T3 (es) 1999-07-16
DE59700097D1 (de) 1999-04-08
DK0800868T3 (da) 1999-10-04
DE19614192A1 (de) 1997-10-16
JP4018192B2 (ja) 2007-12-05
JPH1034028A (ja) 1998-02-10

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