EP0037910B1 - Procédé et dispositif de pulvérisation de poudre - Google Patents

Procédé et dispositif de pulvérisation de poudre Download PDF

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Publication number
EP0037910B1
EP0037910B1 EP81101916A EP81101916A EP0037910B1 EP 0037910 B1 EP0037910 B1 EP 0037910B1 EP 81101916 A EP81101916 A EP 81101916A EP 81101916 A EP81101916 A EP 81101916A EP 0037910 B1 EP0037910 B1 EP 0037910B1
Authority
EP
European Patent Office
Prior art keywords
powder
gas outlet
gas
nozzle
duct
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
Application number
EP81101916A
Other languages
German (de)
English (en)
Other versions
EP0037910A1 (fr
Inventor
Kurt Moos
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
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 Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Priority to AT81101916T priority Critical patent/ATE4291T1/de
Publication of EP0037910A1 publication Critical patent/EP0037910A1/fr
Application granted granted Critical
Publication of EP0037910B1 publication Critical patent/EP0037910B1/fr
Expired 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

Definitions

  • the invention relates to a device for atomizing powder, in particular for coating objects, according to the preamble of patent claim 1.
  • the powder channel consists of two telescopically joined tubular bodies with a radial spacing, the inner tubular body ending at an axial distance upstream of the end of the powder channel given by the outer tubular body and at the end of the Powder channel is followed by a funnel-shaped atomizer nozzle which becomes larger with a constant opening angle.
  • the annular space between the two coaxial tubular bodies forms a gas outlet, via which gas flows axially into the powder channel and accelerates the powder particles in order to generate a high level of frictional electricity between the powder particles and the channel wall.
  • Additional gas is introduced into the inner tubular body via bores running obliquely to the powder channel axis and obliquely to a radial plane of the powder channel axis, which forces the powder flow to perform a cyclonic rotary movement, through which the powder particles are displaced radially outward.
  • a powder atomization device is known from BE-A-880 394, in which an atomizer nozzle with a nozzle opening progressively widening in the flow direction adjoins the powder channel.
  • Atomizer gas is introduced into the atomizer nozzle with radial and tangential, preferably also with a motion component directed obliquely to the flow path of the powder, which atomizes the powder in a cloud-like manner within the atomizer nozzle.
  • Further comparable devices are shown in DE-A-1 427 642 and 1 777 284.
  • the object of the invention is to achieve a more uniform powder concentration and more favorable or slower speed of the powder particles in the atomized powder jet, in order to thereby improve the coating quality and at the same time to prevent powder particles from ricocheting off the coating surface.
  • the drawing shows a powder atomizing device for coating objects. It consists of an atomizer part 1 and an additional part 2. Both together form a device.
  • the atomizer part 1 can also be a so-called spray gun, to which the additional part 2 is attached upstream.
  • a powder channel 3 leads axially through both.
  • the front end of the atomizer part 1 forms an atomizer nozzle 4.
  • An atomizer outlet 5 opens into it and is supplied by an atomizer gas channel 6 with atomizer gas, preferably air. Thread-like windings 7 of the atomizer gas channel 6 let the atomizer gas discharge into the powder stream essentially tangentially and obliquely in the flow direction of the powder of the channel 3.
  • Another gas channel 8 opens out in the form of an annular slot 9 surrounding the nozzle 4.
  • the gas, usually air, of the ring slot serves to form a gas jacket which envelops the powder cloud emerging from the nozzle 4 and gives it a certain shape.
  • an additional gas outlet 10 is formed, which is fed by an additional gas channel 11. Thread-like turns 14 allow the additional gas, normally air, to flow essentially tangentially from the additional outlet 10 into the powder channel 3.
  • the walls 15 of the additional gas outlet 11 run obliquely in the flow direction of the powder channel 3, so that the additional gas gives the powder in the channel 3 not only a radially outwardly directed speed component, but also an axial acceleration component.
  • the walls 15 of the additional gas outlet 10 are designed to converge in the direction of flow, i. H. they narrow like a nozzle in the direction of flow.
  • Electrodes 16 arranged in the powder channel 3 between the additional gas outlet 10 and the atomizer gas outlet 5 serve to electrostatically charge the powder, as is known per se.
  • the electrodes 16 are fed via leads 17 from a high-voltage source, not shown.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)

Claims (6)

1. Dispositif de pulvérisation de poudre, en particulier pour le revêtement d'objets, comportant une buse de pulvérisation en forme d'entonnoir (4) à l'extrémité d'un conduit à poudre (3) et une sortie de gaz (5) pour l'introduction de gaz dans le courant de poudre menant à la buse de pulvérisation, ainsi qu'une sortie de gaz supplémentaire (10) débouchant dans le conduit à poudre (3) en amont de la sortie de gaz (5), et qui introduit du gaz supplémentaire dans le conduit à poudre avec une composante tangentielle en engendrant un écoulement de mélange de gaz et de poudre ayant une densité, qui augmente vers l'extérieur à la façon d'un cyclone, et un tronçon du conduit à poudre (3), qui conduit cet écoulement en mélange à la sortie de gaz (5), caractérisé en ce que l'entonnoir de la buse de pulvérisation (4) est élargie progressivement dans le sens d'écoulement et se trouve immédiatement derrière l'ouverture de sortie du conduit à poudre (3), en ce que la sortie de gaz (5) est constituée, entre l'extrémité d'amont de l'entonnoir et l'ouverture de sortie du conduit à poudre, comme une buse dirigée avec une composante radiale et tangentielle vers l'intérieur de la colonne de mélange poudre-gaz et par laquelle le gaz est émis de l'extérieur, avec une composante radiale et tangentielle, sur la paroi latérale de la colonne de mélange poudre-gaz.
2. Dispositif selon la revendication 1, caractérisé en ce que la sortie de gaz supplémentaire (10) est dirigée obliquement par rapport à l'axe du conduit à poudre (3).
3. Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce que la sortie de gaz supplémentaire (10) est constituée sous la forme d'une buse à fente annulaire entourant le conduit à poudre (3).
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que la section d'écoulement de la sortie de gaz supplémentaire (10) devient plus étroite dans le sens d'écoulement du gaz supplémentaire.
5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que la sortie de gaz supplémentaire (10) débouche dans le conduit à poudre (3) entre 5 et 30 cm, de préférence entre 10 et 20 cm, avant le début de l'entonnoir de la buse de pulvérisation (4).
6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que dans le parcours d'écoulement de la poudre sont disposées, en aval de la sortie de gaz supplémentaire (10), des électrodes (16) servant à charger électriquement la poudre.
EP81101916A 1980-04-12 1981-03-16 Procédé et dispositif de pulvérisation de poudre Expired EP0037910B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81101916T ATE4291T1 (de) 1980-04-12 1981-03-16 Verfahren und vorrichtung zum zerstaeuben von pulver.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3014133A DE3014133C2 (de) 1980-04-12 1980-04-12 Vorrichtung zum Zerstäuben von Pulver
DE3014133 1980-04-12

Publications (2)

Publication Number Publication Date
EP0037910A1 EP0037910A1 (fr) 1981-10-21
EP0037910B1 true EP0037910B1 (fr) 1983-07-27

Family

ID=6099865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101916A Expired EP0037910B1 (fr) 1980-04-12 1981-03-16 Procédé et dispositif de pulvérisation de poudre

Country Status (7)

Country Link
US (1) US4659011A (fr)
EP (1) EP0037910B1 (fr)
JP (1) JPS56158167A (fr)
AT (1) ATE4291T1 (fr)
DE (1) DE3014133C2 (fr)
ES (1) ES8201848A1 (fr)
ZA (1) ZA812424B (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3220796C2 (de) * 1982-06-03 1987-04-09 Ransburg-Gema AG, St. Gallen Zerstäubervorrichtung zum Beschichten mit Pulver
ES8400258A1 (es) * 1982-11-03 1983-10-16 Fusco Lupo Jose De Perfeccionamientos introducidos en pistolas electrostaticas.
DE3503384C1 (de) * 1985-02-01 1986-04-17 Ransburg-Gema AG, St.Gallen Spritzpistole für Beschichtungsmaterial
US5227017A (en) * 1988-01-29 1993-07-13 Ohkawara Kakohki Co., Ltd. Spray drying apparatus equipped with a spray nozzle unit
US5106650A (en) * 1988-07-14 1992-04-21 Union Carbide Chemicals & Plastics Technology Corporation Electrostatic liquid spray application of coating with supercritical fluids as diluents and spraying from an orifice
US5499768A (en) * 1989-05-31 1996-03-19 Ohkawara Kakohki Co., Ltd. Spray nozzle unit
JP2548380Y2 (ja) * 1990-09-28 1997-09-17 株式会社テネックス パッキン付の箱状体
DE19614192A1 (de) * 1996-04-10 1997-10-16 Abb Research Ltd Dispergiersystem für eine Pulversprüheinrichtung
US6053420A (en) * 1996-04-10 2000-04-25 Abb Research Ltd. Dispersion apparatus and process for producing a large cloud of an electrostatically charged powder/air mixture
US5850976A (en) * 1997-10-23 1998-12-22 The Eastwood Company Powder coating application gun and method for using the same
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
US20020121240A1 (en) 2000-07-11 2002-09-05 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
DE10138917A1 (de) * 2001-08-08 2003-03-06 Itw Gema Ag Pulversprühbeschichtungsvorrichtung
US20040159282A1 (en) * 2002-05-06 2004-08-19 Sanner Michael R Unipolarity powder coating systems including improved tribocharging and corona guns
DE102005045176A1 (de) * 2005-09-21 2007-03-22 Ramseier Technologies Ag Applikator
US7827929B2 (en) * 2007-02-23 2010-11-09 Frito-Lay North America, Inc. Pneumatic seasoning system
DE102007041551A1 (de) 2007-08-31 2009-03-05 Itw Gema Gmbh Pulversprühbeschichtungsvorrichtung und Beschichtungspulver-Fördervorrichtung dafür
CN107262320B (zh) * 2017-06-26 2023-08-29 中信戴卡股份有限公司 一种混线式轮毂螺栓孔自动清粉系统及组合式清粉枪

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL286279A (fr) * 1961-12-08
DE1814809A1 (de) * 1968-12-14 1970-07-30 Mueller Ernst Fa Verfahren und Vorrichtung zum Bestaeuben von Gegenstaenden mit Pulver
GB1333091A (en) * 1970-11-12 1973-10-10 Volstatic Coatings Ltd Apparatus for spraying powder
US3873024A (en) * 1971-08-13 1975-03-25 Ransburg Corp Apparatus for spraying a plurality of different powders
US4090666A (en) * 1976-05-19 1978-05-23 Coors Container Company Gun for tribo charging powder
JPS5534159A (en) * 1978-09-01 1980-03-10 Onoda Cement Co Ltd Powder charging device and electrostatic powder depositing device
SE438966B (sv) * 1978-12-04 1985-05-28 Gema Ransburg Ag Sprutanordning for pulver, med i munstycksoppningen tangentiellt inledd spridningsgas
DE2852412C2 (de) * 1978-12-04 1983-08-04 Ransburg-Gema AG, 9015 St.Gallen Zerstäubungseinrichtung für Pulver zum Beschichten von Gegenständen
DE2914960B1 (de) * 1979-04-12 1980-10-16 Gema Ag Appbau Verfahren und Vorrichtung zum Spruehbeschichten des Inneren von eine Naht aufweisenden rohrfoermigen Koerpern

Also Published As

Publication number Publication date
ES501002A0 (es) 1982-01-01
ZA812424B (en) 1983-02-23
US4659011A (en) 1987-04-21
ATE4291T1 (de) 1983-08-15
ES8201848A1 (es) 1982-01-01
JPS56158167A (en) 1981-12-05
DE3014133A1 (de) 1981-10-15
DE3014133C2 (de) 1984-04-19
EP0037910A1 (fr) 1981-10-21

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