EP0978319A1 - Dispositif de pulvérisation de poudre à charge externe et interne - Google Patents

Dispositif de pulvérisation de poudre à charge externe et interne Download PDF

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Publication number
EP0978319A1
EP0978319A1 EP98114846A EP98114846A EP0978319A1 EP 0978319 A1 EP0978319 A1 EP 0978319A1 EP 98114846 A EP98114846 A EP 98114846A EP 98114846 A EP98114846 A EP 98114846A EP 0978319 A1 EP0978319 A1 EP 0978319A1
Authority
EP
European Patent Office
Prior art keywords
voltage
resistance
spraying device
electrode
powder spraying
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
EP98114846A
Other languages
German (de)
English (en)
Other versions
EP0978319B1 (fr
Inventor
Gunter Dr.-Ing. Börner
Johann Christoph Dr. Rer.Nat. Nienburg
Jörg Dr. rer.nat. Sopka
Josef Wittmann
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
Priority to EP98114846A priority Critical patent/EP0978319B1/fr
Priority to DE59800278T priority patent/DE59800278D1/de
Priority to JP11223830A priority patent/JP2000061366A/ja
Priority to US09/370,688 priority patent/US6220533B1/en
Publication of EP0978319A1 publication Critical patent/EP0978319A1/fr
Application granted granted Critical
Publication of EP0978319B1 publication Critical patent/EP0978319B1/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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/087—Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
    • 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
    • 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

Definitions

  • the invention relates to a powder spray device with internal and external charging, which is suitable for electrostatic powder coating is.
  • FIG. 5 shows a known spray gun. It has a chamber 100 into which a powder / air mixture PL can be initiated.
  • the spray gun contains a ground electrode 10 a metallic ring 150 distributed needle-shaped inner high-voltage electrodes 2, and at least one outer high-voltage electrode designed as a needle 5.
  • a high-voltage source designed as a high-voltage cascade 6 supplies high voltage via an electrical connection 30 and the ring 150 to the electrodes 5, 2.
  • the at least one outer high-voltage electrode 5 can be arranged as an option designated additional electrode with which an electric field and an additional Corona are generated outside, which increase the order efficiency should.
  • the electric field generated by the outer needle 5 generates a force on the electrically charged particles.
  • the outer corona can be another Cause charge and repulsion between the ions and the charged Powder particles can cause the spray cloud to expand. Which of the listed physical factors are dominant, depends on the powder output, the properties of the powder (good or poor chargeability) and the distance to the workpiece.
  • both the inner and the external charge required for a sufficiently large charge of the powder particles With larger amounts of powder (greater than 200 g / min), both the inner and the external charge required for a sufficiently large charge of the powder particles.
  • a cascade with a relatively high internal resistance is used for high voltage generation (negative DC voltage).
  • the open circuit voltage U 0 this is the output voltage of the cascade in the unloaded state, is usually in the range from approximately - 80 kV to - 100 kV.
  • the internal resistance of the cascade R i is in the range of approx. 400 M ⁇ to 600 M ⁇ .
  • the maximum output current of the cascade is approx. 80 ⁇ A ... 120 ⁇ A.
  • the usage of cascades with larger output voltages and smaller internal resistances is not possible for security reasons.
  • the relevant standards in Europe and America demand that the air-powder mixture under no circumstances may be ignited by electrical discharges. Among other things limits the performance of the cascade. Further measures to avoid Ignitions are series resistors and avoidance of electrode arrangements, which lead to a high electrical capacity.
  • the invention is therefore based on the object of specifying a powder spraying device, with which an improved consistency of the order efficiency can be achieved leaves.
  • the ratio of the inner and outer currents is set specifically and changes in distance changes only within narrow limits.
  • the ratio of the inner and outer currents is set specifically and changes in distance changes only within narrow limits.
  • the typical nominal distance of Approx. 70% of the current flows 200 mm to the workpiece via the electrodes for the internal charging and 30% via the external electrode.
  • Fig. 1 shows a front and a side view of a ring 1 from a high-resistance material.
  • a high-resistance material for ring 1 and others - High-resistance components described below can e.g. a plastic can be used, which is filled with graphite, carbon black or other conductive substances.
  • the ring 1 In the ring 1 are - evenly distributed over its inner circumference - several needle-shaped inner high voltage electrodes 2 used.
  • the ring 1 is over one high-resistance rod 3 with a high-voltage source 6 (see FIGS. 2 and 5) connectable.
  • the connection point 11 for the rod 3 is in the middle of a two electrodes 2 lying ring piece.
  • About a high-resistance pin 4 is one needle-shaped outer high-voltage electrode 5 at a connection point 12 connected to the rod 3.
  • FIG. 2 shows the complete electrical equivalent circuit diagram of an arrangement shown in FIG. 1, which is connected to a high-voltage cascade, for better understanding.
  • the cascade 6 is simulated by an ideal voltage source with the voltage U 0 and the resistor R i .
  • the discharge distances for the inner 7 and the outer charge 8 are given by their current-voltage characteristics. Ring pieces lying between the inner electrodes 2 are each modeled by resistors R 1 .
  • the resistance of the rod 3 is divided by the connection point 12 for the pin 4 into resistors R 2 and R 3 .
  • the rod 4 is simulated by the resistor R 4 .
  • the resistor R a combines the resistors R i and R 3 .
  • the components relevant for the internal discharge were combined in a first approximation by a resistor R b and a gas discharge path 9.
  • R c is equal to R 4 .
  • characteristic curve 10 applies to the internal discharge and characteristic curve 11 and 12 for external unloading at two different distances from the workpiece. The The distance is smaller for characteristic curve 11 than for characteristic curve 12.
  • the parameters C i , U i0 , C a and U a0 can be determined from the geometric dimensions and the material parameters using a numerical field calculation. However, an experimental check is recommended.
  • the first approximation for R c is that the larger R c , the greater the edge effect.
  • Resistor R 1 should be in the range of approximately 10 M ⁇ to approximately 30 M ⁇ . This resistance prevents field strength increases and thus high currents when the powder comes into direct contact with the internal needles.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
EP98114846A 1998-08-07 1998-08-07 Dispositif de pulvérisation de poudre à charge externe et interne Expired - Lifetime EP0978319B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP98114846A EP0978319B1 (fr) 1998-08-07 1998-08-07 Dispositif de pulvérisation de poudre à charge externe et interne
DE59800278T DE59800278D1 (de) 1998-08-07 1998-08-07 Pulversprüheinrichtung mit interner und externer Aufladung
JP11223830A JP2000061366A (ja) 1998-08-07 1999-08-06 内部および外部で荷電する粉体スプレイ装置
US09/370,688 US6220533B1 (en) 1998-08-07 1999-08-09 Powder-spraying apparatus with internal and external charging

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98114846A EP0978319B1 (fr) 1998-08-07 1998-08-07 Dispositif de pulvérisation de poudre à charge externe et interne

Publications (2)

Publication Number Publication Date
EP0978319A1 true EP0978319A1 (fr) 2000-02-09
EP0978319B1 EP0978319B1 (fr) 2000-09-20

Family

ID=8232417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98114846A Expired - Lifetime EP0978319B1 (fr) 1998-08-07 1998-08-07 Dispositif de pulvérisation de poudre à charge externe et interne

Country Status (4)

Country Link
US (1) US6220533B1 (fr)
EP (1) EP0978319B1 (fr)
JP (1) JP2000061366A (fr)
DE (1) DE59800278D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6874712B2 (en) * 2002-09-27 2005-04-05 Abb Inc. Swirl gun for powder particles
US7360724B2 (en) * 2004-10-20 2008-04-22 The Procter & Gamble Company Electrostatic spray nozzle with internal and external electrodes
US7455249B2 (en) * 2006-03-28 2008-11-25 Illinois Tool Works Inc. Combined direct and indirect charging system for electrostatically-aided coating system
FR2942415B1 (fr) * 2009-02-24 2011-03-11 Sames Technologies Projecteur electrostatique comportant des electrodes mobiles et procede de projection electrostatique mettant en oeuvre un tel projecteur.
JP6112130B2 (ja) * 2015-03-25 2017-04-12 トヨタ自動車株式会社 静電ノズル、吐出装置及び半導体モジュールの製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027050A (en) * 1975-07-10 1977-05-31 Frederic David Haig Method and apparatus for electrostatic coating
DE2837428A1 (de) * 1977-09-09 1979-03-22 Gema Ag Einrichtung zum elektrostatischen pulver-beschichten von gegenstaenden
EP0203694A2 (fr) * 1985-04-18 1986-12-03 Nordson Corporation Pistolet pour la pulvérisation de poudre
DE3812358A1 (de) * 1988-04-14 1989-10-26 Hestermann Gerhard Spruehgeraet fuer die elektrostatische kunststoffpulverbeschichtung
WO1998024555A1 (fr) 1996-12-06 1998-06-11 Abb Research Ltd. Dispositif de pulverisation pour poudrage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3167255A (en) * 1961-05-08 1965-01-26 Sames Mach Electrostat Electrostatic sprayer system having a separate high resistivity conductor
US4576827A (en) * 1984-04-23 1986-03-18 Nordson Corporation Electrostatic spray coating system
US5904294A (en) * 1996-09-13 1999-05-18 Nordson Corporation Particle spray apparatus and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027050A (en) * 1975-07-10 1977-05-31 Frederic David Haig Method and apparatus for electrostatic coating
DE2837428A1 (de) * 1977-09-09 1979-03-22 Gema Ag Einrichtung zum elektrostatischen pulver-beschichten von gegenstaenden
EP0203694A2 (fr) * 1985-04-18 1986-12-03 Nordson Corporation Pistolet pour la pulvérisation de poudre
DE3812358A1 (de) * 1988-04-14 1989-10-26 Hestermann Gerhard Spruehgeraet fuer die elektrostatische kunststoffpulverbeschichtung
WO1998024555A1 (fr) 1996-12-06 1998-06-11 Abb Research Ltd. Dispositif de pulverisation pour poudrage

Also Published As

Publication number Publication date
US6220533B1 (en) 2001-04-24
JP2000061366A (ja) 2000-02-29
EP0978319B1 (fr) 2000-09-20
DE59800278D1 (de) 2000-10-26

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