EP2477751A1 - Procédé et dispositif d'acheminement et de distribution de poudres dans un courant gazeux - Google Patents

Procédé et dispositif d'acheminement et de distribution de poudres dans un courant gazeux

Info

Publication number
EP2477751A1
EP2477751A1 EP10754292A EP10754292A EP2477751A1 EP 2477751 A1 EP2477751 A1 EP 2477751A1 EP 10754292 A EP10754292 A EP 10754292A EP 10754292 A EP10754292 A EP 10754292A EP 2477751 A1 EP2477751 A1 EP 2477751A1
Authority
EP
European Patent Office
Prior art keywords
gas
powder
container
level
inlets
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
EP10754292A
Other languages
German (de)
English (en)
Other versions
EP2477751B1 (fr
Inventor
Eckart Theophile
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.)
Relyon Plasma GmbH
Original Assignee
Reinhausen Plasma 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 Reinhausen Plasma GmbH filed Critical Reinhausen Plasma GmbH
Publication of EP2477751A1 publication Critical patent/EP2477751A1/fr
Application granted granted Critical
Publication of EP2477751B1 publication Critical patent/EP2477751B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B05B7/16—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 incorporating means for heating or cooling the material to be sprayed
    • B05B7/20—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 incorporating means for heating or cooling the material to be sprayed by flame or combustion
    • B05B7/201—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 incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
    • B05B7/205—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 incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed being originally a particulate material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/42—Plasma torches using an arc with provisions for introducing materials into the plasma, e.g. powder, liquid

Definitions

  • the invention relates to a method and apparatus for conveying and distributing powders in a gas stream.
  • a cube with an edge length of 1 cm has a surface of 0.006 m 2 .
  • downstream work processes such as in plasma coating processes or laser
  • DE 44 23 197 discloses a powder pump for powder for spray coating of articles in a rod-like manner
  • the powder pump has a powder suction, is sucked through the powder from an open-topped powder container and conveyed through an inner tube of the powder pump to a consumer.
  • the promotion itself is done by generating a vacuum in the powder pump.
  • the vacuum is created with an injector nozzle located near the powder suction port.
  • DE 10 2006 002 582 A1 discloses a powder conveyor with a fluidising unit.
  • the fluidizing unit is arranged at the end of a powder suction pipe of the powder conveyor and blows in the intake of the Pulveransaugrohrs fluidizing air in the powder supply, so that the powder can be fluidized and thus easier to be sucked and transported.
  • the fluidising unit is above and concentric with the
  • Pulveransaugrohres is connected. A fluidization takes place directly below the Pulveransaugö réelle
  • Fluidization improves the suction of the powder, the constancy of the amount of powder is not optimal during suction. Furthermore, agglomerates of the powder are insufficiently dissolved and mostly directly through the
  • the invention is based on the object, a method for conveying and To provide dispersing powders in a gas stream, which allows the promotion of extremely fine powders, especially those with a particle size of less than 10 [im, with small amounts of gas, are nevertheless avoided in the agglomeration of the powder or dissolved and at the same time
  • Outlet preferably two above the maximum level of the container arranged outlets from the container
  • the periodic loading of the powder with the pressurized gas causes the powder to be swirled up into the free space above the powder and distributed there. At the same time, the pressure pulses dissolve any agglomerates of the powder.
  • the overpressure of the closed container (Pressure vessel) introduced gas is preferably in the range of 100 mbar to 5 bar.
  • a higher delivery rate is achieved in that the powder is acted upon by several, in particular four gas inlets with the gas under pressure.
  • the distribution of the powder in the gas and the dissolution of existing agglomerates can be improved by passing the powder over several consecutive times
  • the gas pressure pulses act without temporal
  • Container level are arranged, the admission takes place circumferentially around the container.
  • a further improvement in the swirling and distribution of the powder in the space above the powder in the container is achieved when the application of one or more
  • the level of the powder is kept in the closed container constantly above a minimum level and the powder below the minimum level via at least one standing in contact with the powder gas inlet directly with gas
  • the pressurized gas flows through the powder into the overlying one Free space and promotes the fluidized by the pressure pulses powder / gas mixture toward each outlet.
  • the outlet can be connected in an advantageous embodiment of the invention with a hose, with which the powder / gas mixture another process, in particular a
  • the powder is replenished from a refill container via an inlet into the container.
  • the refill container is under the same overpressure as the closed container, is refilled in the.
  • the level of the powder is kept in the closed container constantly above a minimum level.
  • a preferred device for carrying out the method results from the features of claim 9.
  • Powder is carried out with pressurized gas
  • each gas inlet is located at a particular in the interior of the container projecting, but at least in the interior of the container opening nozzle.
  • the nozzle has a corresponding
  • the closed container for receiving the powder is designed in particular circular-cylindrical.
  • the gas inlets are in a plane of the circular cylindrical container
  • the individual inlets are with the help of
  • Control means in particular a valve control, periodically exposed to gas.
  • the individual inlets can be subjected to gas in succession or partially overlapping in time or in a temporally overlapping manner. In the latter case, all gas inlets are simultaneously exposed to gas in a periodic sequence.
  • Interruptions take place so that, at least temporarily, gas does not enter the container via any of the inlets.
  • At least one nozzle is arranged parallel to a secant with respect to the circular bottom of the container, the secant being at a distance from the latter Center runs.
  • Piping connected to a refill container for the powder, wherein from the preferably larger
  • Refill container powder automatically runs into the closed container for the distribution and conveying of the powder.
  • the mouth is located in the interior of the container
  • Figure la is a schematic plan view and Figure lb is a schematic side view of a first
  • Figure 2a is a plan view of a second
  • Figure 2b is a plan view of a third
  • Figure 3 is a schematic side view of a fourth
  • Embodiment of a device according to the invention with arranged at a pitch angle gas inlets nozzles;
  • Figure 4 is a diagram for illustrating the
  • FIG. 6 shows the connection of a device according to the invention
  • binder conveyor Distributing powders in a gas stream, hereinafter referred to as "powder conveyor” (1), essentially consists of a closed container (2), which via a gas inlet (3) with means not shown for gas supply
  • the container (2) is up to a maximum
  • an outlet (6) for a powder / gas mixture (7) is arranged above the maximum level (4) of the container (2).
  • the outlet (6) is in particular with a connection for a
  • Hose line (19) equipped for forwarding the powder / gas mixture (7) to the downstream process.
  • Gas supply comprise as control means for the periodic control of the gas, in particular a valve control with which a pressurized gas in a periodic sequence via the gas inlet (3) in the interior of the container (2) is inserted.
  • the valve control operates, for example, at a frequency of 10 Hz.
  • the height of the gas pressure is determined such that the pressure inside the container (2) is higher than the ambient pressure, with pressure losses in a possibly connected to the powder outlet
  • the introduced gas is preferably an inert gas to prevent dust explosions in the container (2)
  • the gas inlet (3) opens directly into the powder (5).
  • the gas inlets (3) above the maximum level (4) of the powder (5), so that the gas impinges on the surface (9) of the powder (5) ,
  • the powder conveyor (1) according to Figure 2a differs from the powder conveyor of Figure 1 in that the
  • This type of gas introduction into the container (2) produces a spiral flow (13) of the powder / gas mixture (7) in the container (2).
  • the channel (8) having the outlet (6), as can be seen in Figure 2a, is also aligned parallel to a secant with respect to the circular bottom (12) of the container (2).
  • FIG. 2b shows a preferred embodiment of the invention
  • Powder conveyor (1) with four offset by 90 degrees to each other, but arranged in a plane, gas inlets (3a - d) and two outlets (6a - b) for the powder / gas mixture (7).
  • the periodic admission of the gas inlets (3a-d) with the gas under overpressure can take place simultaneously.
  • the gas inlets (3a-d) with the gas under overpressure can take place simultaneously.
  • FIG. 3 shows a modification of the device according to FIG. 1.
  • the powder conveyor (1) differs essentially in that it has two nozzles (10) projecting into the interior of the container (2) with an angle of incidence (14) of approximately 25 degrees to that Bottom (12) of the container (2) having the
  • Gas inlets (3a - b) have. This angle of attack improves the dissolution of agglomerates in the fine powder (5).
  • the method according to the invention for conveying and distributing powders in a gas stream with the aid of the preferred apparatus according to FIG. 2b will be explained in more detail below with reference to FIG.
  • the container (2) is filled with powder (5) via a pipe (16) up to the maximum level (4).
  • the powder (5) is acted upon by the four gas inlets (3a-d) in chronological succession.
  • Figure 4 c) can be seen how the gas inlets (3a - d) without
  • Pressure impulses from the four gas inlets (3a-d) improve the delivery rate with low gas consumption. Furthermore, the continuous, periodic causes
  • Piping (16) for refilling the powder extends into the interior of the container (2), wherein the mouth, as can be seen in particular from Figure 5a, just below the maximum level (4) of the container (2).
  • FIG. 6 shows an example of application of the powder conveyor (1) according to the invention.
  • the outlet (6) of the powder conveyor (1) is connected via a hose line (19) to a jet generator (20) for generating a bundled plasma jet by arc discharge.
  • a jet generator (20) for generating a bundled plasma jet by arc discharge.
  • the plasma jet (21) of the jet generator (20) the powder / gas mixture (7) in the region of its outlet (22)) is introduced.
  • the finely divided powder (5) is deposited with the plasma jet (21) on the surface (23) of an object (24).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Air Transport Of Granular Materials (AREA)

Abstract

L'invention a pour but de permettre d'acheminer des poudres extrêmement fines, avec répartition uniforme de celles-ci dans un courant gazeux, et d'éviter ou de supprimer des agglomérations desdites poudres. A cet effet, l'invention est caractérisée en ce qu'un récipient fermé (2) est rempli de poudre (5), tout au plus jusqu'à un niveau maximum de remplissage (4), en ce que la poudre est soumise, via au moins une entrée de gaz (3), de préférence via quatre entrées de gaz, dans une succession périodique, à l'action d'un gaz en surpression, et en ce que le mélange poudre/gaz (7) mis en tourbillonement est expulsé du récipient, via au moins une sortie (6), de préférence, deux sorties disposées au-dessus du niveau de remplissage maximum du récipient.
EP10754292.0A 2009-09-15 2010-08-24 Procédé et dispositif d'acheminement et de distribution de poudres dans un courant gazeux Not-in-force EP2477751B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910041338 DE102009041338A1 (de) 2009-09-15 2009-09-15 Verfahren und Vorrichtung zum Fördern und Verteilen von Pulvern in einem Gasstrom
PCT/EP2010/062304 WO2011032807A1 (fr) 2009-09-15 2010-08-24 Procédé et dispositif d'acheminement et de distribution de poudres dans un courant gazeux

Publications (2)

Publication Number Publication Date
EP2477751A1 true EP2477751A1 (fr) 2012-07-25
EP2477751B1 EP2477751B1 (fr) 2013-11-13

Family

ID=43357905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10754292.0A Not-in-force EP2477751B1 (fr) 2009-09-15 2010-08-24 Procédé et dispositif d'acheminement et de distribution de poudres dans un courant gazeux

Country Status (3)

Country Link
EP (1) EP2477751B1 (fr)
DE (1) DE102009041338A1 (fr)
WO (1) WO2011032807A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011052119A1 (de) 2011-07-25 2013-01-31 Eckart Gmbh Verfahren zur Substratbeschichtung und Verwendung additivversehener, pulverförmiger Beschichtungsmaterialien in derartigen Verfahren
US20140230692A1 (en) 2011-07-25 2014-08-21 Eckart Gmbh Methods for Substrate Coating and Use of Additive-Containing Powdered Coating Materials in Such Methods
JP6122666B2 (ja) * 2013-03-07 2017-04-26 東京エレクトロン株式会社 ホッパー及び溶射装置
KR20160039149A (ko) * 2013-04-20 2016-04-08 엠테크스마트 가부시키가이샤 분립체의 도포 또는 분배 방법
PL3238832T5 (pl) 2016-04-29 2024-06-03 Wagner International Ag Urządzenie transportujące proszek do transportowania proszku powlekającego do aplikatora proszku, instalacja do powlekania proszkowego i sposób obsługi urządzenia transportującego proszek

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
US3134513A (en) * 1960-09-30 1964-05-26 Dust Control Processes Ltd Insufflator
AT253428B (de) * 1964-02-21 1967-04-10 Gattys Tech Vorrichtung und Verfahren zum Austragen von Massengut aus einem Behälter
US3412898A (en) * 1966-02-07 1968-11-26 British Titan Products Powder feeder
FR2579573A1 (fr) * 1985-03-28 1986-10-03 Barron Claude Procede et dispositif pour l'extraction de substances pulverulentes et/ou granuleuses
FR2623421A1 (fr) * 1987-11-19 1989-05-26 Tsex Issl Melangeur pneumatique de materiaux pulverulents
AU6227094A (en) * 1992-12-17 1994-07-04 Nordson Corporation Improved powder coating system for difficult to handle powders
DE4423197A1 (de) 1994-07-01 1996-01-04 Gema Volstatic Ag Pulverpumpe, insbesondere für Pulver zum Sprühbeschichten von Gegenständen
US6986625B2 (en) * 2003-04-21 2006-01-17 Anthony John Witheridge Maintaining fluidized beds of cohesive particles using vibrating fluids
DE102006002582B4 (de) 2005-01-26 2019-07-04 J. Wagner Ag Fluidisiereinheit für einen Pulverförderer und Pulverförderer mit Fluidisiereinheit
US20090110529A1 (en) * 2007-10-31 2009-04-30 M-I Llc Pneumatic transfer of finely ground clay material

Non-Patent Citations (1)

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Title
See references of WO2011032807A1 *

Also Published As

Publication number Publication date
EP2477751B1 (fr) 2013-11-13
DE102009041338A1 (de) 2011-04-07
WO2011032807A1 (fr) 2011-03-24

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