EP1588780A1 - Dispositif de mise en fluidisation comprenant des electrodes pour installation de revêtement par poudrage - Google Patents

Dispositif de mise en fluidisation comprenant des electrodes pour installation de revêtement par poudrage Download PDF

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Publication number
EP1588780A1
EP1588780A1 EP05003917A EP05003917A EP1588780A1 EP 1588780 A1 EP1588780 A1 EP 1588780A1 EP 05003917 A EP05003917 A EP 05003917A EP 05003917 A EP05003917 A EP 05003917A EP 1588780 A1 EP1588780 A1 EP 1588780A1
Authority
EP
European Patent Office
Prior art keywords
fluidizing
powder
electrode
coating powder
coating
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
EP05003917A
Other languages
German (de)
English (en)
Other versions
EP1588780B1 (fr
Inventor
Markus Treppschuh
Hans-Georg Fritz
Thomas Dürr
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.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
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 Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP1588780A1 publication Critical patent/EP1588780A1/fr
Application granted granted Critical
Publication of EP1588780B1 publication Critical patent/EP1588780B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material

Definitions

  • the invention relates to a fluidizing body for fluidization a coating powder according to the preamble of Claim 1.
  • the coating powder In powder coating plants, the coating powder is in usually in the fluidized state as a powder-air mixture transported, with the powder-air mixture similar to a liquid behaves and therefore easily promoted can.
  • the generation of the powder-air mixture is also called Fluidization refers to and usually takes place in one Powder chamber, as for example from US 4,615,649 and WO 94/22589 is known.
  • the powder chamber is here with the Coating powder filled, with the bottom of the powder chamber consists of a porous material that is permeable to air, but is powder impermeable.
  • a fluid floor designated bottom of the powder chamber is used to produce the Powder-air mixture compressed air injected into the powder chamber, whereby the coating powder is fluidized.
  • the fluid bottom usually consists of an electric insulating material, because the electrostatically charged Powder dust particles otherwise attracted to the fluid bottom would, resulting in contaminants on the fluid floor could lead.
  • a disadvantage of the above-described powder chamber for Fluidization of the coating powder is the fact that between the electrostatically charged coating powder and the electrically insulating fluid bottom or in reverse Direction electrical discharges can occur, the in a coating powder with a high particulate matter content and a correspondingly low minimum ignition energy to one Inflammation of the powder-air mixture can result.
  • a fluidizing device in which two electrodes are arranged in the powder chamber are.
  • the one electrode is in this case within the powder chamber arranged in the upper area and is in operation charged to high voltage.
  • the other electrode is against it within the powder chamber in the lower area above the Fluid bottom arranged and electrically grounded.
  • Operational An electric current forms between these two electrodes Field off, causing the located in the powder chamber Powder particles are electrostatically charged and therefore adhere better to the workpiece to be coated, therefore is electrically grounded.
  • the grounded electrode is used but only as an earth electrode for electrical charging the powder particles and does not prevent their electrostatic Charging by the electrically insulating Fluid soil is caused.
  • the grounded Electrode in this case a separate component, which the production cost elevated.
  • the invention is therefore based on the object, the beginning to improve the known fluid floor described above, that inflammations of the powder-air mixture by electrical Discharges between the coating powder and the fluid bottom or in the reverse direction even at a high particulate matter can be reliably prevented.
  • the invention comprises the general technical teaching, a Provide electrode assembly, via the static electricity is derived from the coating powder before the stored charge amount is sufficient for an electrical Discharge the ignition energy of the powder-air mixture to exceed.
  • the fluidizing body according to the invention therefore preferably has an electrode assembly, which in the fluidization body is integrated.
  • electrode assembly which in the fluidization body is integrated.
  • the electrode arrangement may be formed, for example, as a grid be, wherein the grid-shaped electrode arrangement is preferably embedded in the surface of the fluidizing body is.
  • the grid-shaped electrode arrangement preferably on the side arranged the powder-air mixture.
  • the grid-shaped electrode arrangement divides the surface of the fluidization body into a plurality of grid surfaces, each having a size of less than 500 cm 2 , 250 cm 2 , 100 cm 2 , 50 cm 2 , 25 cm 2 , 20 cm 2 , 16 cm 2 or 4 cm 2 have.
  • This dimensioning of the lattice-shaped electrode arrangement is advantageous, since in this way it is also possible to use coating powders whose ignition energy is less than 3 mJ.
  • the electrode arrangement for discharging static electricity at least a pointed electrode passing through the porous material the fluidizing body is guided, wherein the free tip of the electrode preferably in the powder chamber protrudes.
  • the electrode assembly even a plurality of pointed electrodes due to the porous material of the fluidizing body through and over the fluidizing body are distributed so that the pointed electrodes quasi make a needle carpet.
  • the individual pointed electrodes of this needle carpet each include free surfaces of the fluidizing body, the size of the free surfaces preferably being less than 500 cm 2 , 250 cm 2 , 100 cm 2 , 50 cm 2 , 25 cm 2 , 20 cm 2 , 16 cm 2 or 4 cm 2 .
  • This offers the advantage that it is also possible to use coating powder which has an ignition energy of less than 3 mJ.
  • the electrode arrangement on the other hand, several electrode rings on the surface the fluidization body arranged and electrically connected to each other.
  • the electrode rings be circular or elliptical, however, are also non-circular configurations of the electrode rings possible.
  • the electrode rings each include an annular area of less than 500 cm 2 , 250 cm 2 , 100 cm 2 , 50 cm 2 , 25 cm 2 , 20 cm 2 , 16 cm 2 or 4 cm 2 .
  • This in turn offers the advantage that it is also possible to use a coating powder which has an ignition energy of less than 3 mJ.
  • the porous material of the Fluidizing body is preferably electrically insulating, an attraction between the fluidizing body material and the electrostatically charged powder dust particles to prevent.
  • the porous material of the fluidization body according to the invention preferably also electrically insulating.
  • the invention is not based on plate-shaped Fluidizing body is limited, as in described in the cited prior art. Rather, the fluidizing body, for example, also be tubular, with the fluidizing air from the inside the tubular fluidizing body by the Wall blown outward into the powder chamber becomes.
  • the electrode assembly for dissipation of static electricity for example, on the lateral surface arranged the tubular fluidization body be, wherein the above-described different variants possible are.
  • the invention includes not only those described above Fluidizing body according to the invention as a single Component, but also a fluidization device with such a fluidizing body.
  • the coating powder used has a specific Ignition, while between the coating powder and the fluid bottom or in the reverse direction electrical Discharges may occur due to design have a maximum discharge energy.
  • the construction of the Fluid bottom and the other parts of the fluidization device is hereby preferably designed so that the maximum Discharge energy less than the ignition energy of the coating powder is, so that discharge-related ignitions of the powder-air mixture can be prevented. This is possible For example, achieve that the electrode assembly for dissipating static electricity from the coating powder has sufficiently many pointed electrodes.
  • the maximum discharge energy can be in the inventive Fluidizing device also lower, that the free Area between the individual electrodes (e.g., pointed electrodes, Ring electrodes) of the electrode assembly reduced becomes.
  • the maximum discharge energy is below this of 3 mJ, so that also coating powder with a high particulate matter and a correspondingly small Ignition energy of less than 3 mJ.
  • the electrode assembly in the inventive Fluidizing device preferably grounded or is at least at a near-ground electric potential held.
  • the electrical voltage is between the electrode assembly and mass so in the range between 0 V and 10 kV, with any maximum values within this interval are possible. For example, the voltage less than 5kV, 1kV, 500V, 250V, 100V or 20V be.
  • the electrode arrangement of the fluidization body according to the invention So not at high voltage potential.
  • the invention also encompasses a complete powder coating system with such a fluidization device according to the invention and the use of an inventive Fluidizing body for fluidizing a coating powder in a coating plant.
  • FIG. 1 shows an inventive Fluidizing device 1 for fluidizing a coating powder in a powder coating plant, wherein the powder coating system be carried out conventionally can.
  • the fluidizing device 1 consists essentially of a bottom part 2, a patch on the bottom part 2 cylindrical Wall 3, a cover 4 and a Fluidleitersteil 5, between the wall 3 and the bottom part of the second is fixed.
  • the lid 4, the wall 3 and the fluidization bottom 5 limit Here, a powder chamber 6, in which in operation a fluidized powder-air mixture is located.
  • the Fluidleitersteil 5 consists of a porous, air-permeable, but powder-impermeable material, so that from the fluid air chamber 7 compressed air in the powder chamber 6 is blown and thereby in the powder chamber. 6 fluidized coating powder located.
  • a powder extraction line 9 arranged over which the fluidized powder-air mixture can be sucked out of the powder chamber 6.
  • Figure 2 shows a perspective view of a preferred Embodiment of the Fluidmaschines Camills 5, the in FIG 1 shown fluidizing device.
  • the electrode arrangement 10 is designed such that a coating powder with an ignition energy of less than 3 mJ can be used.
  • the maximum discharge energy is therefore less than 3 mJ in the fluidization device 1 and is below the powder-specific ignition energy.
  • the grid-shaped electrode arrangement 10 includes in each case grid surfaces which have a size of less than 250 cm 2 .
  • a special feature of this embodiment is that the electrode assembly 10 of a plurality of ring electrodes exist on the surface of the Fluidmaschinesteils 5 on the powder chamber 6 facing side embedded and electrically connected to each other, wherein the entire electrode assembly 10 is electrically grounded.
  • the individual ring electrodes each include an annular area which is smaller than 250 cm 2 , so that it is also possible to use a coating powder whose ignition energy is less than 3 mJ.
  • a special feature of this embodiment is that the electrode assembly of a variety of needle-shaped Electrodes 11, which are axially through the fluidization bottom 5 are passed through, wherein the tip of the electrodes 11 on the powder chamber 6 facing side of Fluidization bottom 5 protrudes from the fluidization bottom 5, static electricity from that in the powder chamber 6 derived coating powder can be derived.
  • the pointed electrodes 11 each have an electrode head 12, wherein the electrode heads 12 of the individual electrodes 11 of the electrode assembly 10 with each other by electrical connections 13th connected to each other.
  • the electrode assembly 10 thus forms a quasi one Electrode carpet, which is an excessive and safety-endangering Charging the powder-air mixture in the powder chamber 6 prevented.
  • FIG. 5 shows an alternative embodiment of a tubular fluidizing body 14, wherein the fluidizing body 14 a wall 15 made of a porous material which is permeable to air but powder-impermeable. For fluidization of coating powder is so hereby from inside the tubular fluidizing body 14 Compressed air through the wall 15 therethrough into a Blown powder chamber.
  • the outer circumferential surface of the tubular fluidizing body 14 is in this case with a grid-shaped electrode arrangement covered, circulating in the circumferential direction Electrodes 16 and axially extending electrodes 17, wherein this grid-shaped electrode assembly is electrically grounded is.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP05003917A 2004-04-23 2005-02-23 Dispositif de mise en fluidisation comprenant des electrodes pour installation de revêtement par poudrage Not-in-force EP1588780B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004019946 2004-04-23
DE102004019946A DE102004019946A1 (de) 2004-04-23 2004-04-23 Fluidisierungskörper für eine Pulverbeschichtungsanlage

Publications (2)

Publication Number Publication Date
EP1588780A1 true EP1588780A1 (fr) 2005-10-26
EP1588780B1 EP1588780B1 (fr) 2010-04-21

Family

ID=34933892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05003917A Not-in-force EP1588780B1 (fr) 2004-04-23 2005-02-23 Dispositif de mise en fluidisation comprenant des electrodes pour installation de revêtement par poudrage

Country Status (3)

Country Link
EP (1) EP1588780B1 (fr)
AT (1) ATE464953T1 (fr)
DE (2) DE102004019946A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2070510A1 (fr) * 2007-12-10 2009-06-17 Takasago International Corporation Système de nettoyage personnel
CN114572693A (zh) * 2022-02-16 2022-06-03 湖南远阳智能装备有限公司 一种吸粉、反吹一体式密闭供粉中心

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660136A (en) 1970-11-23 1972-05-02 Gen Electric Method of coating slotted articles
DE2650338A1 (de) 1976-01-27 1977-07-28 Oranienburg Infrarot Veb Verfahren und vorrichtung zum elektrostatischen beschichten von gegenstaenden in einem wirbelbett
DE2704714A1 (de) 1976-02-05 1977-08-11 Armco Steel Corp Verfahren, vorrichtung und gitter zur elektrostatischen beschichtung von gegenstaenden
US4078519A (en) 1977-02-02 1978-03-14 Poly-Clad Equipment Corporation Electrostatically charged fluidized bed
DE3237830A1 (de) 1981-10-19 1983-04-28 Northern Telecom Ltd., Montreal, Quebec Elektrode fuer eine beschichtungsvorrichtung mit wirbelbett
WO1994022589A1 (fr) 1993-04-07 1994-10-13 Nordson Corporation Procede et appareil de revetement d'articles tridimensionnels
US5518546A (en) 1994-10-05 1996-05-21 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
US6506455B1 (en) 1999-06-15 2003-01-14 Atofina Triboelectric fluidizded bed method and apparatus for coating an object
WO2003097247A1 (fr) 2002-05-13 2003-11-27 Nordson Corporation Appareil simplifie de fluidisation de poudres, et procede associe

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660136A (en) 1970-11-23 1972-05-02 Gen Electric Method of coating slotted articles
DE2650338A1 (de) 1976-01-27 1977-07-28 Oranienburg Infrarot Veb Verfahren und vorrichtung zum elektrostatischen beschichten von gegenstaenden in einem wirbelbett
DE2704714A1 (de) 1976-02-05 1977-08-11 Armco Steel Corp Verfahren, vorrichtung und gitter zur elektrostatischen beschichtung von gegenstaenden
US4078519A (en) 1977-02-02 1978-03-14 Poly-Clad Equipment Corporation Electrostatically charged fluidized bed
DE3237830A1 (de) 1981-10-19 1983-04-28 Northern Telecom Ltd., Montreal, Quebec Elektrode fuer eine beschichtungsvorrichtung mit wirbelbett
WO1994022589A1 (fr) 1993-04-07 1994-10-13 Nordson Corporation Procede et appareil de revetement d'articles tridimensionnels
US5518546A (en) 1994-10-05 1996-05-21 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
US6506455B1 (en) 1999-06-15 2003-01-14 Atofina Triboelectric fluidizded bed method and apparatus for coating an object
WO2003097247A1 (fr) 2002-05-13 2003-11-27 Nordson Corporation Appareil simplifie de fluidisation de poudres, et procede associe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2070510A1 (fr) * 2007-12-10 2009-06-17 Takasago International Corporation Système de nettoyage personnel
CN114572693A (zh) * 2022-02-16 2022-06-03 湖南远阳智能装备有限公司 一种吸粉、反吹一体式密闭供粉中心

Also Published As

Publication number Publication date
DE502005009442D1 (de) 2010-06-02
ATE464953T1 (de) 2010-05-15
DE102004019946A1 (de) 2005-11-17
EP1588780B1 (fr) 2010-04-21

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