EP0792694B1 - Procédé et dispositif pour commander l'alimentation d'une poudre fluidisée à partir d'un réservoir - Google Patents

Procédé et dispositif pour commander l'alimentation d'une poudre fluidisée à partir d'un réservoir Download PDF

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Publication number
EP0792694B1
EP0792694B1 EP97102463A EP97102463A EP0792694B1 EP 0792694 B1 EP0792694 B1 EP 0792694B1 EP 97102463 A EP97102463 A EP 97102463A EP 97102463 A EP97102463 A EP 97102463A EP 0792694 B1 EP0792694 B1 EP 0792694B1
Authority
EP
European Patent Office
Prior art keywords
container
pipe
powder
air
pressure
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
EP97102463A
Other languages
German (de)
English (en)
Other versions
EP0792694A3 (fr
EP0792694A2 (fr
Inventor
Gunter Dr. Börner
Josef Wittmann
Johann Dr. Nienburg
Jörg Dr. Sopka
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 EP0792694A2 publication Critical patent/EP0792694A2/fr
Publication of EP0792694A3 publication Critical patent/EP0792694A3/fr
Application granted granted Critical
Publication of EP0792694B1 publication Critical patent/EP0792694B1/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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1691—Apparatus to be carried on or by a person or with a container fixed to the discharge device
    • 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for 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
    • 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
    • B05B7/1413—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising a container fixed to the discharge device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/05—Fluidized bed

Definitions

  • the invention relates to a method and a device for controlling the Mass flow of a fluidized solid when it is removed from a container.
  • the method or the device is generally applicable for closing or partial or completely opening an outlet opening on a container for fluidized Solid, with an increased in the container compared to the ambient air pressure There is pressure.
  • the method and the device are particularly suitable for use in powder spraying devices for electrostatic painting.
  • a powder spraying device is, for example, in the unpublished German patent application P 195 370 89.
  • the structure of this powder spraying device is shown below 1 explained in more detail.
  • the powder spraying device is a mechanical locking system for the powder outlet.
  • control air causes this through a delivery line aspirated powder / air mixture from the delivery line to a spray nozzle and is fed via a return line into a special collecting container, where the filter is used to hold back the powder and blow off air.
  • the order and the physical principle used here requires a relatively high level of effort, a powder deposit in the area of the spray nozzle is not avoided.
  • WO-A-94/13405 also describes a system for powder spraying in which a control air the fluid mass flow is controlled.
  • a control air the fluid mass flow is controlled.
  • the fluid extraction is based on the principle of a Venturi nozzle creates a negative pressure.
  • an agitator is arranged in the container.
  • the one used Control air is blown into the pipe against the direction of the mass flow.
  • To avoid an additional cleaning air is used for powder deposits.
  • the arrangement is relatively complex.
  • the invention is therefore based on the object of a method and a device for Specify control of the exit of a fluidized solid, the aforementioned Disadvantages should be avoided.
  • the task is performed by a device for controlling the exit of a fluidized solid dissolved from a container, the device which in claim 4 indicated features, also starting from WO-A-94/13405.
  • the method and the device cause that by transverse introduction of closing air in the extraction tube the powder from the tube in a closed, under pressure standing container pushed back and thereby the powder output stopped becomes.
  • a nozzle located at the outlet will help with each spray stop the closing air cleaned.
  • the mass flow of the fluidized solid is simple Way through change of the closing air flow controllable.
  • the solids emissions can be adjusted accordingly Pressure ratios also to intermediate values between zero and a maximum value can be set.
  • FIG. 1 shows a powder spraying device already described in application P 195 370 89 1, which essentially consists of a closed container 2 with a first Chamber 3 and a second chamber 4 exists.
  • first chamber 3 opens a compressed air supply line 5.
  • Compressed air 7 passes through a frit 6 into the second chamber 4.
  • powder 8 which passes through a powder feed opening 9 can be filled.
  • the fluidized powder 8 is removed from the area of the fluid bed through a pipe 25 and by a laterally arranged on the container 2 and with a mechanical Closing device 13 closable nozzle 11 led out.
  • needles are arranged as corona electrodes 14, which coincide with a high-voltage source, not shown, are connected and charging of the emerging powder particles.
  • the shape of the emerging powder cloud 15 can by the nozzle 11 and an additional Impact body 16 are determined.
  • the shape and arrangement of the electrodes 14 can be adapted to it.
  • the air supply can be influenced and using a flow meter 18 to measure the air supply rate.
  • the outlet opening 10 for fluidizing air is through a controllable outlet valve 19 completed, with which a defined flow resistance can be set.
  • the air pressure p 1 in the first chamber 3 and the air pressure p 4 above the powder bed 8 can be regulated via the valves 17 and 19 with the aid of a control and regulating device, not shown.
  • the pressures p 1 and p 4 are measured with suitable pressure sensors.
  • the ambient air pressure is denoted by p 0 .
  • P 2 denotes the air pressure above the frit 6 and thus immediately below the fluidized powder bed.
  • the pressure drop p 1 -p 2 depends on the selected frit 6 and must be taken into account when dimensioning.
  • P 3 denotes the pressure inside the container 2 in the fluid bed at the level of the powder removal, which pressure can be adjusted by regulating the pressures p 1 or p 4 .
  • FIG. 2 and 3 each show a schematic diagram of the embodiment according to the invention a locking system for the exit of fluidized powder, which is in place of the mechanical locking system shown in FIG. 1, FIG shows the closed state and FIG. 3 shows the open state.
  • FIG. 1 Reference symbols refer to components of the same type in each case.
  • FIG. 2 shows a section of the container 2, with the removal tube 25 for fluidized powder 8.
  • the jacket of the removal tube 25 has an opening 50, into which an air tube 51 opens. Closing air L S can be introduced into the air tube 51. The method for controlling the fluid powder outlet and thus the operation of the device shown in FIGS. 2 and 3 is explained below.
  • a closing air pressure p R is established in the air pipe 51.
  • the closing air pressure p R in the extraction pipe 25 is greater than the pressure p 3 in the container 2, powder leakage is prevented; ie at a pressure ratio p R / p 3 > 1, the fluid powder 8 is pushed back into the container 2. If the closing air pressure p R in the extraction pipe 25 is less than the pressure p 3 in the container 2, that is to say the ratio p R / p 3 ⁇ 1, fluidized powder emerges.
  • a numerical example can further clarify which air pressures are required for closing.
  • a sampling pipe diameter of 8 mm air pipe diameter of 2 mm and a nozzle diameter of 0.8 mm
  • a closing air pressure p R of at least 2.1 bar is required to discharge the powder stop completely.
  • a closing air pressure p R of at least 2.4 bar is required under otherwise identical conditions as previously mentioned in order to completely stop the powder output.
  • FIG. 2 shows a state in which a closing air pressure p R that is greater than the fluid bed pressure p 3 is set by appropriately introducing closing air L S into the extraction tube 25. There is no powder leakage.
  • the closing air L S flows partly into the container 2 and partly through the nozzle 11.
  • Fig. 3 shows a state in which the supply of closing air L S is completely shut off and powder can thereby be ejected.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Glanulating (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)

Claims (5)

  1. Procédé de contrôle continu du débit-masse d'une substance solide (8) fluidisée, lors de son prélèvement à l'aide d'un tube de prélèvement (25) dans un lit fluidisé placé dans une cuve (2), par envoi d'air de blocage (Ls) dans le tube de prélèvement (25), caractérisé
    a) en ce qu'on utilise un tube de prélèvement (25) qui pénètre avec son extrémité d'entrée dans une zone médiane du lit fluidisé, une buse (11) étant disposée à l'extrémité de sortie du tube de prélèvement,
    b) en ce qu'on utilise comme cuve (2), une cuve fermée avec une pression interne (p3) supérieure à la pression de l'air ambiant (p0), une contre-pression, qui provoque le refoulement partiel ou total de la poudre fluidisée (8) dans la cuve (2), à travers le tube de prélèvement (25), pouvant être générée par injection transversale d'air de blocage (Ls) dans le tube de prélèvement (25).
  2. Procédé selon la revendication 1, caractérisé en ce que l'air de blocage (Ls) s'échappe au moins partiellement par la buse (11) et, en particulier pour un rapport d'une pression d'air de blocage (pR) à l'intérieur du tube (25) à une pression (p3) à l'intérieur de la cuve (2) engendrant le blocage, provoque un nettoyage du tube (25) et de la buse (11).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'il permet de commander le débit de poudre d'un dispositif de pulvérisation de poudre (1) pour la peinture électrostatique.
  4. Dispositif pour le contrôle du débit-masse d'une substance solide (8) fluidisée, lors de son prélèvement à l'aide d'un tube de prélèvement (25) dans un lit fluidisé placé dans une cuve (2), le contrôle étant réalisé par envoi d'air de blocage (Ls) dans le tube de prélèvement (25), caractérisé
    a) en ce que le tube de prélèvement (25) débouche avec son extrémité d'entrée dans une zone médiane d'un lit fluidisé présent dans la cuve (2), et qu'une buse (11) est disposée à l'extrémité de sortie du tube de prélèvement (25),
    b) en ce que la cuve (2) est fermée, la pression (p3) à l'intérieur de la cuve (2), en service, étant supérieure à la pression de l'air ambiant (p0), et
    c) en ce que la paroi du tube de prélèvement (25) comporte une ouverture (50) dans laquelle débouche un tube à air (51), par lequel l'air de blocage (Ls) peut être injecté dans le tube de prélèvement (25) avec une pression ajustable, transversalement au flux de substance solide, le débit-masse de la substance solide (8) fluidisée dans le tube de prélèvement (25) pouvant ainsi être contrôlé par un choix adapté du rapport de la pression (pR) de l'air de blocage dans le tube de prélèvement (25) à la pression (p3) dans la cuve (2).
  5. Dispositif selon la revendication 4, caractérisé en ce que la cuve (2) fait partie d'un dispositif de pulvérisation de poudre (1) pour la peinture électrostatique.
EP97102463A 1996-02-20 1997-02-15 Procédé et dispositif pour commander l'alimentation d'une poudre fluidisée à partir d'un réservoir Expired - Lifetime EP0792694B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19606214A DE19606214B4 (de) 1996-02-20 1996-02-20 Verfahren und Einrichtung zur Steuerung des Austritts eines fluidisierten Feststoffs aus einem Behälter
DE19606214 1996-02-20

Publications (3)

Publication Number Publication Date
EP0792694A2 EP0792694A2 (fr) 1997-09-03
EP0792694A3 EP0792694A3 (fr) 1998-05-27
EP0792694B1 true EP0792694B1 (fr) 2003-03-12

Family

ID=7785865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102463A Expired - Lifetime EP0792694B1 (fr) 1996-02-20 1997-02-15 Procédé et dispositif pour commander l'alimentation d'une poudre fluidisée à partir d'un réservoir

Country Status (6)

Country Link
US (1) US5800876A (fr)
EP (1) EP0792694B1 (fr)
JP (1) JP3987152B2 (fr)
KR (1) KR970061773A (fr)
AT (1) ATE234159T1 (fr)
DE (2) DE19606214B4 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20010654A1 (it) * 2001-03-28 2002-09-28 Ines Urbani Dispositivo per verniciatura elettrostatica ad emissione lineare di polvere attraverso una doppia fenditura di qualsivoglia lunghezza per us
DE10138917A1 (de) 2001-08-08 2003-03-06 Itw Gema Ag Pulversprühbeschichtungsvorrichtung
US7273339B2 (en) 2003-03-07 2007-09-25 Haden Schweitzer Corporation Powder transport method and apparatus
DE102004013153A1 (de) * 2004-03-17 2005-10-06 Itw Gema Ag Verfahren und Vorrichtung zum Fördern von Pulver, insbesondere Pulver zum Sprühbeschichten von Gegenständen
US6988698B2 (en) * 2004-04-22 2006-01-24 Lucasay Manufacturing Co. Appliance mounting apparatus
BE1015883A3 (fr) * 2004-06-08 2005-10-04 Occhio Procede et dispositif de dispersion de poudres seches.
US20080152437A1 (en) * 2006-12-26 2008-06-26 Illinois Tool Works Inc. Pulverulent material transport
US20080205189A1 (en) 2007-02-27 2008-08-28 Illinois Tool Works Inc. Dense phase pump for pulverulent material
KR101329032B1 (ko) * 2011-04-20 2013-11-14 주식회사 실리콘밸류 다결정 실리콘 제조장치 및 이를 이용한 다결정 실리콘의 제조방법

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
FR2314775A1 (fr) * 1975-06-18 1977-01-14 Inst Francais Du Petrole Appareillage pour former une couche d'un produit pulverulent sur la surface d'un objet
US4165134A (en) * 1977-08-16 1979-08-21 The Continental Group, Inc. Pneumatic powder flow diverting device
FR2521170B1 (fr) * 1982-02-09 1986-11-21 Dietrich & Cie De Procede pour l'emaillage d'objets par pistolage electrostatique
DE3244742C2 (de) * 1982-12-03 1986-07-03 Bergwerksverband Gmbh, 4300 Essen Vorrichtung zum Austragen von Feststoffpartikeln aus einem Behälter, insbesondere einem Wirbelschichtreaktor sowie Verfahren zum Betreiben einer solchen Vorrichtung
HU188492B (en) * 1983-09-28 1986-04-28 Eroemue- Eshalozattervezoe Vallalat,Hu Device for measuring and controlling volume flow of fluidizable powdery or granulat materials
DE3544915A1 (de) * 1985-12-19 1987-06-25 Basf Ag Dosiervorrichtung zum regelbaren einbringen von rieselfaehigen, pulverfoermigen stoffen in unter druck stehende raeume
JPH0615050B2 (ja) * 1986-02-05 1994-03-02 ノードソン株式会社 粉粒体の断続スプレイ塗布方法とそのガン
DE4010914C1 (en) * 1990-04-04 1991-07-11 Wagner International Ag, Altstaetten, Ch Fluidising and convey set=up for electrostatic powder coating appts. - has container pivotable about 180 deg. on frame and with fluidising plate on lid
CA2150474C (fr) * 1992-12-17 2004-04-06 Takashi Watanabe Systeme ameliore de poudrage pour poudres difficiles a manipuler
GB2277469B (en) * 1993-04-27 1996-07-24 Itw Ltd An electrostatic system
DE4325044C2 (de) * 1993-07-26 2002-07-18 Itw Gema Ag Pulverfördervorrichtung, insbesondere für Beschichtungspulver
DE4436919C2 (de) * 1994-10-15 1997-06-05 Boris Petrovic Dr Ing Leonov Einrichtung zur tribostatischen Pulverlackbeschichtung
US5558713A (en) * 1994-10-31 1996-09-24 The Procter & Gamble Company Method and apparatus for forming a pulsed stream of particles for application to a fibrous web
DE19537089A1 (de) * 1995-10-05 1997-04-10 Abb Research Ltd Verfahren und Einrichtung zum Pulversprühen

Also Published As

Publication number Publication date
JP3987152B2 (ja) 2007-10-03
DE19606214A1 (de) 1997-08-21
DE59709463D1 (de) 2003-04-17
ATE234159T1 (de) 2003-03-15
US5800876A (en) 1998-09-01
KR970061773A (ko) 1997-09-12
DE19606214B4 (de) 2006-06-01
JPH09313992A (ja) 1997-12-09
EP0792694A3 (fr) 1998-05-27
EP0792694A2 (fr) 1997-09-03

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