EP0792694B1 - Verfahren und Einrichtung zur Steuerung des Austritts eines fluidisierten Feststoffes aus einem Behälter - Google Patents
Verfahren und Einrichtung zur Steuerung des Austritts eines fluidisierten Feststoffes aus einem Behälter Download PDFInfo
- 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
Links
Images
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)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
- Air Transport Of Granular Materials (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Description
- Fig. 1
- Prinzipdarstellung einer Pulversprüheinrichtung mit mechanischer Schließvorrichtung am Pulveraustritt,
- Fig. 2
- Prinzipdarstellung eines Schließsystems mittels Lufteinleitung in ein Entnahmerohr, wobei der geschlossene Zustand gezeigt ist,
- Fig. 3
- Prinzipdarstellung des Schließsystems entsprechend Fig. 2 im geöffneten Zustand.
Claims (5)
- Verfahren zur kontinuierlichen Steuerung des Massenstromes eines fluidisierten Feststoffs (8) bei seiner Entnahme mittels eines Entnahmerohres (25) aus einem in einem Behälter (2) befindlichen Fluidbett durch Einleitung einer Schließluft (LS) in das Entnahmerohr (25), dadurch gekennzeichnet, daßa) ein Entnahmerohr (25) verwendet wird, das mit seiner Eingangsseite in einem mittleren Bereich des Fluidbetts hineinragt, wobei an der Entnahmerohr-Ausgangsseite eine Düse (11) angeordnet ist,b) als Behälter (2) ein geschlossener Behälter mit einem gegenüber dem Umgebungsluftdruck (p0) erhöhter Behälter-Innendruck (p3) verwendet wird, wobei mittels Quer- Einleitung von Schließluft (LS) im Entnahmerohr (25) ein Gegendruck erzeugbar ist, der bewirkt, daß das Fluidpulver (8) teilweise oder vollständig durch das Entnahmerohr (25) in den Behälter (2) zurückgedrängt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Schließluft (LS) wenigstens teilweise durch die Düse (11) austritt, und insbesondere bei einem den Schließzustand bewirkenden Verhältnis eines im Rohr (25) bestehenden Schließluftdrucks (pR) zum Druck (p3) im Behälter (2) eine Reinigung des Rohres (25) und der Düse (11) bewirkt.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß damit der Pulverausstoß aus einer Pulversprüheinrichtung (1) zum elektrostatischen Lackieren gesteuert wird.
- Vorrichtung zur Steuerung des Massenstromes eines fluidisierten Feststoffs (8) bei seiner Entnahme mittels eines Entnahmrohres (25) aus einem Behälter (2), wobei die Steuerung durch Einleitung einer Schließluft (LS) in das Entnahmerohr (25) erfolgt, dadurch gekennzeichnet, daßa) das Entnahmerohr (25) mit seiner Eingangsseite in einem mittleren Bereich eines im Behälter (2) befindlichen Fluidbetts endet, und an der Ausgangsseite des Entnahmerohrs (25) eine Düse (11) angeordnet ist,b) der Behälter (2) geschlossen ausgeführt ist, wobei betrieblich im Behälter (2) ein gegenüber dem Umgebungsluftdruck (p0) erhöhter Druck (p3) besteht, undc) der Mantel des Entnahmerohres (25) eine Öffnung (50) aufweist, in die ein Luftrohr (51) mündet, über das Schließluft (LS) in das Entnahmerohr (25) mit einem einstellbaren Druck quer zum Feststoffstrom einleitbar ist, womit der Massenstrom des fluidisierten Feststoffs (8) im Entnahmerohr (25) durch geeignete Wahl des Verhältnisses von Schließluftdruck (pR) im Rohr (25) zum Druck (p3) im Behälter (2) steuerbar ist.
- Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Behälter (2) Teil einer Pulversprüheinrichtung (1) zum elektrostatischen Lackieren ist.
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 (de) | 1997-09-03 |
EP0792694A3 EP0792694A3 (de) | 1998-05-27 |
EP0792694B1 true EP0792694B1 (de) | 2003-03-12 |
Family
ID=7785865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97102463A Expired - Lifetime EP0792694B1 (de) | 1996-02-20 | 1997-02-15 | Verfahren und Einrichtung zur Steuerung des Austritts eines fluidisierten Feststoffes aus einem Behälter |
Country Status (6)
Country | Link |
---|---|
US (1) | US5800876A (de) |
EP (1) | EP0792694B1 (de) |
JP (1) | JP3987152B2 (de) |
KR (1) | KR970061773A (de) |
AT (1) | ATE234159T1 (de) |
DE (2) | DE19606214B4 (de) |
Families Citing this family (9)
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)
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 |
DE69331148T2 (de) * | 1992-12-17 | 2002-07-11 | Nordson Corp | Pulverauftragesystem für schwer zu handhabende pulver |
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 |
-
1996
- 1996-02-20 DE DE19606214A patent/DE19606214B4/de not_active Expired - Fee Related
-
1997
- 1997-02-15 EP EP97102463A patent/EP0792694B1/de not_active Expired - Lifetime
- 1997-02-15 DE DE59709463T patent/DE59709463D1/de not_active Expired - Lifetime
- 1997-02-15 AT AT97102463T patent/ATE234159T1/de not_active IP Right Cessation
- 1997-02-19 KR KR1019970004979A patent/KR970061773A/ko not_active Application Discontinuation
- 1997-02-19 JP JP03513797A patent/JP3987152B2/ja not_active Expired - Fee Related
- 1997-02-20 US US08/804,129 patent/US5800876A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0792694A3 (de) | 1998-05-27 |
EP0792694A2 (de) | 1997-09-03 |
ATE234159T1 (de) | 2003-03-15 |
US5800876A (en) | 1998-09-01 |
JP3987152B2 (ja) | 2007-10-03 |
JPH09313992A (ja) | 1997-12-09 |
DE59709463D1 (de) | 2003-04-17 |
DE19606214B4 (de) | 2006-06-01 |
KR970061773A (ko) | 1997-09-12 |
DE19606214A1 (de) | 1997-08-21 |
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