EP0941145B1 - Dispositif de pulverisation pour poudrage - Google Patents

Dispositif de pulverisation pour poudrage Download PDF

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Publication number
EP0941145B1
EP0941145B1 EP96942367A EP96942367A EP0941145B1 EP 0941145 B1 EP0941145 B1 EP 0941145B1 EP 96942367 A EP96942367 A EP 96942367A EP 96942367 A EP96942367 A EP 96942367A EP 0941145 B1 EP0941145 B1 EP 0941145B1
Authority
EP
European Patent Office
Prior art keywords
powder
chamber
electrode
spraying
electrodes
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
EP96942367A
Other languages
German (de)
English (en)
Other versions
EP0941145A1 (fr
Inventor
Günter BÖRNER
Hans-Christoph Nienburg
Josef Wittmann
Helmut BÖHME
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 EP0941145A1 publication Critical patent/EP0941145A1/fr
Application granted granted Critical
Publication of EP0941145B1 publication Critical patent/EP0941145B1/fr
Anticipated expiration legal-status Critical
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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

Definitions

  • the invention relates to a powder spraying device for electrostatic powder coating according to the preamble of claim 1.
  • a powder spray device at least contains a chamber in which a tip discharge electrode opposite the material flow and an opposite like this polarized blunt counter electrode are arranged upstream at a distance from the tip discharge electrode.
  • a configuration with several is used to improve the charging of the powder particles chambers connected in series. It is also proposed that To design the chamber in such a way that there are continuous enlargements and narrowing which are intended to cause material particles to brake under turbulence and so more intensely exposed to the force field. Finally, it is suggested to arrange openings distributed over the circumference of the at least one chamber, via the additional air is introduced, which is the average density of the mixture of air and Reduce powder and improve charging.
  • a powder spraying device according to the preamble of claim 1 is known from EP-A-237 249 known.
  • the device has a chamber, the cross section of which is larger than the cross section of a feed line for a powder-air mixture.
  • a ground electrode and several high voltage electrodes arranged with cleaning air are inflatable.
  • the design of the chamber and in particular the electrodes is chosen so that a Plasma with positive polarity and a plasma with negative polarity are formed.
  • To the A voltage is intermittently applied to plasma electrodes. Trials have shown that these measures cause sparking and contamination of the electrodes.
  • the invention is therefore based on the object of specifying a powder spraying device, which leads to an improved charging of the powder particles and thereby to a lead to an improved deposition rate.
  • An embodiment refers to the arrangement of one or more external electrodes further improvement of charging or for field control and thus to increase of efficiency.
  • Another embodiment relates to a variable design of the distance between earth electrode and high voltage electrodes, which is an optimum between good charging and disruptive effects such as re-ionization.
  • Chamber 1 shows a powder spraying device 10.
  • a swirl chamber 1 is placed on a carrier element 6 of the powder spraying device 10.
  • Chamber 1 is in the Embodiment preferably cylindrical.
  • one Cross-section can also be an ellipsoidal or polygonal cross-section It is essential that the cross section of the chamber is larger than the cross section a supply line 11 for powder and air PL.
  • the powder / air supply line 11 opens transverse to the main axis 12 of the chamber 1 into the chamber 1.
  • the powder / air mixture PL in the spray direction 13, against the spray direction 13 (Fig. 3) or be introduced transversely to the spray direction 13.
  • the spray direction 13 is the main axis 12 towards an outlet 3.
  • the powder is charged by corona, which is attached to needle-shaped high-voltage electrodes 7 is generated, which are at high voltage potential.
  • the high tension is generated using a high-voltage cascade 4, which is part of the powder spraying device 10, and via an electrical connection 22 to the high voltage needles delivered.
  • the high-voltage electrodes 7 are arranged in a ring in the area of the outlet 3 and form an intensive corona to the earth electrode 5.
  • all powder particles are forced through to move an area with high field strength and charge density.
  • additional electrodes 8 that can be arranged can be intensified via external charging.
  • On outer impact body 9 produces a more or less wide rotationally symmetrical Powder cloud.
  • a slit-shaped flat nozzle 23 can also be used kick that creates a flat powder jet.
  • FIG. 2 Such an alternative design of the outlet area is shown in FIG. 2.
  • the other design of the powder spraying device corresponds to that of FIG. 1 which will be further described below.
  • the needle-shaped high-voltage electrodes 7 are ring-shaped in a front ring 2 arranged around the circumference.
  • the outlet 3 is placed on the front ring 2.
  • the chamber 1 is made of an insulating material such as plastic, glass or ceramic
  • the earth electrode 5 is tubular and in the carrier element 6 in the direction of Main axis 12 arranged centered.
  • the tubular earth electrode 5 preferably has a diameter of 0.3 cm inside and 0.5 cm outside.
  • On the inside of the chamber directed end of the earth electrode 5 is this by a with rounded edges 17th provided headboard 20 completed.
  • the earth electrode 5 and in particular its Headboard 20 is covered with a cover 16 made of insulating material to electrical Avoid breakthroughs.
  • the insulating cover 16 has one on the front Cover opening 18 approximately 0.1 to 0.5 cm in diameter.
  • earth electrode cleaning air RLE is guided, which is a powder particle accumulation avoids at the earth electrode 5.
  • the cleaning air also ensures RLE for an additional swirl of the powder and it can be changed the air rate, the powder / air ratio is adjusted or regulated.
  • the tubular earth electrode 5 has 20 openings in an area in front of the head part 19, through which the cleaning air RLE out of the pipe into a gap 21 between kick the earth electrode 5 and the cover 16, wash around the head part 20 and can emerge from the cover opening 18 into the chamber 1.
  • the supplied for cleaning the earth electrode 5 and the high-voltage electrodes 7 Cleaning air RLE, RLH can be used to advantage after switching off the supply of the powder / air mixture PL powder particles from the chamber 1 blow out and a deposit of the powder particles on the electrodes 5, 7 to avoid
  • Fig. 3 shows a basic illustration of a powder spraying device, in which - how further already mentioned above - the powder / air mixture PL via the feed line 11 is initiated against the spray direction.
  • FIG. 3 Baffle plate 24 shown, the powder particles closer to the high voltage needles 7 introduces. The powder then exits through holes 25 and strikes the outer baffle plate 9. It is understood that the other, described with reference to FIG. 1 Refinements also apply to the embodiment according to FIG. 3.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Claims (7)

  1. Dispositif de projection de poudre pour le revêtement par poudrage électrostatique, dans lequel il est prévu dans une chambre (1) du dispositif de projection (10), pour appliquer une charge interne à la poudre, au moins une électrode à haute tension (7) et une électrode de terre (5), la section de la chambre (1) étant supérieure à la section d'une conduite d'entrée (11) pour un mélange poudre/air (PL) et dans lequel
    a) la conduite d'entrée (11) débouche dans la chambre (1) transversalement à la direction de projection (13) ou à contre-courant par rapport à la direction de projection (13), ce qui permet un brassage intense de la poudre,
    b) plusieurs électrodes à haute tension (7) sont réparties en anneau dans une zone (2) en amont d'une sortie (3) du dispositif (10), et
    c) les électrodes à haute tension (7) ainsi que l'électrode de terre (5) peuvent être soumises à un jet d'air de nettoyage (RLE, RLH), aux fins d'éviter la formation de dépôts de poudre sur lesdites électrodes
    caractérisé en ce que
    d) la longueur de la chambre (1) est de 7 à 15 cm et son diamètre de 2 à 4 cm,
    e) la distance entre l'électrode de terre (5) et l'électrode à haute tension (7) est de 7 à 14 cm,
    f) l'électrode de terre (5) est tubulaire, est disposée de manière centrée par rapport à l'axe de la chambre, et est fermée à son extrémité côté intérieur de la chambre par un élément formant tête (20) à bords (17) arrondis recouvert d'une coiffe (16) en matériau isolant.
  2. Dispositif de projection de poudre selon la revendication 1, caractérisé en ce que la distance dans l'espace entre l'électrode de terre (5) et l'électrode à haute tension (7) est réglable.
  3. Dispositif de projection de poudre selon la revendication 1 ou 2, caractérisé en ce qu'au moins une électrode supplémentaire (8) est disposée dans la région de la sortie (3), laquelle électrode applique une charge externe supplémentaire ou contrôle le champ.
  4. Dispositif de projection de poudre selon une des revendications précédentes, caractérisé en ce qu'un élément brise-jet (9) ou une buse plate (23) est disposé dans la région de la sortie (3).
  5. Dispositif de projection de poudre selon une des revendications précédentes, caractérisé en ce que la chambré (1) est en un matériau isolant tel que de la matière plastique, du verre ou de la céramique.
  6. Dispositif de projection, de poudre selon une des revendications précédentes, caractérisé en ce que l'électrode de terre (5), dans une portion située en amont de l'élément formant tête (20), comporte des ouvertures (19) à travers lesquelles l'air de nettoyage (RLE) peut sortir du tube formant électrode dans un espace (21) entre l'électrode (5) et la coiffe (16), baigner l'élément formant tête (20) et sortir en direction de la chambre (1) par une ouverture (18) aménagée dans la coifffe.
  7. Dispositif de projection de poudre selon une des revendications précédentes, caractérisé en ce que les électrodes à haute tension (7) sont conformées en aiguille et sont disposées chacune dans un petit tube (15), qui est parcouru par de l'air (RLH) de nettoyage d'électrode à haute tension.
EP96942367A 1996-12-06 1996-12-06 Dispositif de pulverisation pour poudrage Expired - Lifetime EP0941145B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1996/005462 WO1998024555A1 (fr) 1996-12-06 1996-12-06 Dispositif de pulverisation pour poudrage

Publications (2)

Publication Number Publication Date
EP0941145A1 EP0941145A1 (fr) 1999-09-15
EP0941145B1 true EP0941145B1 (fr) 2002-09-18

Family

ID=8166433

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96942367A Expired - Lifetime EP0941145B1 (fr) 1996-12-06 1996-12-06 Dispositif de pulverisation pour poudrage

Country Status (7)

Country Link
US (1) US6254684B1 (fr)
EP (1) EP0941145B1 (fr)
JP (1) JP3866295B2 (fr)
AU (1) AU1177497A (fr)
CA (1) CA2273830A1 (fr)
DE (1) DE59609702D1 (fr)
WO (1) WO1998024555A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59800278D1 (de) * 1998-08-07 2000-10-26 Abb Research Ltd Pulversprüheinrichtung mit interner und externer Aufladung
US6814318B2 (en) * 1999-08-18 2004-11-09 The Procter & Gamble Company Disposable cartridge for electrostatic spray device
US20040011901A1 (en) * 2000-07-10 2004-01-22 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
US20030038193A1 (en) * 2000-07-11 2003-02-27 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
US6645300B2 (en) * 2000-07-11 2003-11-11 Nordson Corporation Unipolarity powder coating systems including improved tribocharging and corona guns
DE10113299A1 (de) * 2001-03-16 2002-09-19 Alstom Switzerland Ltd Verfahren zum Herstellen eines Leiterstabes
US20040159282A1 (en) * 2002-05-06 2004-08-19 Sanner Michael R Unipolarity powder coating systems including improved tribocharging and corona guns
US20050098659A1 (en) * 2002-09-27 2005-05-12 Milojevic Dragoslav K. Swirl gun for powder particles
US6874712B2 (en) 2002-09-27 2005-04-05 Abb Inc. Swirl gun for powder particles
US7240861B2 (en) * 2003-08-12 2007-07-10 The University Of Western Ontario Method and apparatus for dispensing paint powders for powder coatings
ITBG20050034A1 (it) * 2005-06-03 2006-12-04 Trasmetal Spa Dispositivo elettrostatico di verniciatura.
DE102005045176A1 (de) * 2005-09-21 2007-03-22 Ramseier Technologies Ag Applikator
US8763936B2 (en) * 2006-06-23 2014-07-01 Terronics Development Company Nozzle assembly and methods related thereto
US20200001311A1 (en) * 2017-01-30 2020-01-02 Sumitomo Chemical Company, Limited Electrostatic atomization device, information processing terminal, and control method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4228961A (en) * 1979-05-07 1980-10-21 Onoda Cement Co., Ltd. Electrostatic power painting head
SU1313511A1 (ru) * 1985-11-26 1987-05-30 Криворожский горнорудный институт Трибоэлектростатический сепаратор дл разделени минералов-диэлектриков
JPH0636891B2 (ja) * 1986-03-10 1994-05-18 秀雄 長坂 粉体荷電装置および静電粉体塗着装置
US4811898A (en) * 1987-09-21 1989-03-14 Nordson Corporation Electrostatic powder spray gun with adjustable deflector and electrostatic shield
WO1991006376A1 (fr) * 1989-11-06 1991-05-16 Frederick David Haig Pistolet vaporisateur avec electrodes tubulaires et a decharge par effet de couronne
DE19502522A1 (de) * 1995-01-27 1996-08-01 Gema Volstatic Ag Sprühvorrichtung für Beschichtungsmaterial

Also Published As

Publication number Publication date
EP0941145A1 (fr) 1999-09-15
JP3866295B2 (ja) 2007-01-10
WO1998024555A1 (fr) 1998-06-11
CA2273830A1 (fr) 1998-06-11
DE59609702D1 (de) 2002-10-24
US6254684B1 (en) 2001-07-03
AU1177497A (en) 1998-06-29
JP2001505125A (ja) 2001-04-17

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