WO1996003216A1 - Procede et dispositif permettant de produire et de doser un aerosol pulverulent - Google Patents

Procede et dispositif permettant de produire et de doser un aerosol pulverulent Download PDF

Info

Publication number
WO1996003216A1
WO1996003216A1 PCT/DE1995/000947 DE9500947W WO9603216A1 WO 1996003216 A1 WO1996003216 A1 WO 1996003216A1 DE 9500947 W DE9500947 W DE 9500947W WO 9603216 A1 WO9603216 A1 WO 9603216A1
Authority
WO
WIPO (PCT)
Prior art keywords
powder
ultrasound
vessel
container
discharge pipe
Prior art date
Application number
PCT/DE1995/000947
Other languages
German (de)
English (en)
Inventor
Günter LINS
Berthold Michelt
Robert SEEBÖCK
Jobst Verleger
Helmut Moll
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP95925703A priority Critical patent/EP0772495B1/fr
Priority to DE59504997T priority patent/DE59504997D1/de
Publication of WO1996003216A1 publication Critical patent/WO1996003216A1/fr

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
    • B05B7/14—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
    • B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means
    • B05B7/1445—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means involving vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0615—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers spray being produced at the free surface of the liquid or other fluent material in a container and subjected to the vibrations
    • 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
    • B05B7/1606—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 the spraying of the material involving the use of an atomising fluid, e.g. air

Definitions

  • the invention relates to a method for producing and metering a powder aerosol, in which a powder is subjected to ultrasound by means of an ultrasound oscillation system.
  • the invention relates to the associated device for carrying out the specified method, with a vessel for powder and an ultrasound transducer, from which ultrasound is applied to whirl up the powder.
  • the starting materials for short-term plasma evaporation are powders.
  • powders In order to transport powder into a plasma, it is placed in a carrier gas so that an aerosol is formed which can be passed into the plasma torch.
  • certain maximum grain sizes of the powders must not be overlapped.
  • aggregations i.e. Agglomerates can be prevented from powder grains, since such agglomerates are not completely evaporable due to their mass.
  • Inductively coupled plasma torches can work at a gas pressure that is significantly below atmospheric pressure, for example at 250 mbar. Since the powder feed system is inevitably connected to the plasma torch, care must be taken to ensure that the working pressure in the plasma torch does not rise inadmissibly due to the influence of the powder feeder.
  • brush dispensers have been used to generate the aerosol required for short-term plasma evaporation.
  • the powder stuffed into a cylindrical body is fed through a pipe to a rotating metal brush, which is one of the feed speeds proportional amount of the powder from the stuffing body.
  • a gas stream passing through the brush chamber then picks up the powder and transports it to the place where it is needed.
  • DE-PS 28 42 232 discloses a method and a device for atomizing liquids, suspensions and emulsions, agglomerated dusts or powders and mixtures thereof, in which The substances or substance mixtures to be atomized are conveyed into the pressure nodes of a standing sound wave in a gaseous medium and are dispersed there without contact with the sound-exciting parts of the ultrasonic transducer.
  • DE-OS 30 49 244 a device for generating liquid mist by means of ultrasound is known, in which a piezoelectric sound vibration in a liquid vessel sets a base plate into high-frequency vibrations, as a result of which the one contained in the vessel Liquid is subjected to ultrasound.
  • This device is especially used for nebulizing medical liquids.
  • the object of the invention is to remove powder specifically for short-term plasma evaporation from a storage container in such a way that any agglomerates which may be present are destroyed during the removal and to convey it into the plasma burner in such a way that during dosing and on the Away from the storage container to the plasma torch, there is no renewed agglomeration of powder grains into impermissibly large bodies which cannot be completely evaporated.
  • the object is achieved in that the powder to be swirled is in direct contact with the wall of a vessel coupled to an ultrasound source or in direct contact with the ultrasound oscillation system and that the powder in the vessel is whirled up by the action of the ultrasound and is taken up by a carrier gas.
  • the ultrasound is preferably applied to the vessel via a sound-conducting medium, which can be a liquid or a solid.
  • the carrier gases are used at pressures below atmospheric pressure.
  • the vessel contains a feed pipe and a discharge pipe for the carrier gas for the purpose of receiving the whirled up powder.
  • FIG. 1 shows a powder conveyor with ultrasonic coupling through a liquid in section
  • FIG. 2 shows a top view of such a powder conveyor
  • FIG. 3 shows an alternative embodiment to FIG. 1
  • FIG. 4 shows the associated top view
  • FIG. 5 shows another alternative to FIG. 1
  • FIG. 6 shows a powder conveyor with ultrasonic coupling through a solid body
  • FIG. 7 shows the completion of a powder conveyor with means for monitoring the powder concentration.
  • a powder conveyor is designated by 1 in FIG.
  • a container 6 is immersed in a liquid 2 of a known ultrasonic bath 4, on the bottom of which a powder 8 to be conveyed is distributed.
  • the container 6 holds a feed pipe 10 and a discharge pipe 12 for the carrier gas 14.
  • the powder whirled up by the action of ultrasound is taken up by the discharge pipe 12.
  • Another opening which is not specifically shown in FIG. 1, makes it possible to fill the container 6 with powder.
  • Additives for example salts, can be dissolved in the liquid 2, which influence the speed of sound and thus the coupling of ultrasound into the container 6.
  • the ultrasonic vibrations can also be coupled into the container 6 in a manner other than that specified.
  • an ultrasound transmitter can be directly mechanically connected to the storage container.
  • the container has a circular cross section.
  • the supply pipe 10 and the Auslei ⁇ tung pipe 12 are arranged such that their axes b respectively represent c tangents to with respect to the container cross-section con- centric circles with radii RJ, or R c where R b> R ci st -
  • the feed pipe 10 can be attached directly tangentially to the jacket of the container 6.
  • the tangential arrangement of the feed pipe 10 causes the carrier gas together with the whirled-up powder 8 to be rotated within the container 6.
  • the resulting centrifugal force which is proportional to the mass of the powder particles, deflects any inadmissibly heavy powder constituents further towards the container wall than lighter powder constituents.
  • the arrangement of the discharge pipe 12 at a position located further inward enables the selective removal of powder components, the mass of which lies in a certain permissible range.
  • the end of the feed pipe 10 is arranged tangentially with respect to a circle concentric with the circular cross-section of the container 6 with the radius R ⁇ , so that the carrier gas 14 is set into a rotational movement with the powder 8 it has taken up.
  • the feed pipe 10 is positioned so that its end lies below the opening of the discharge pipe 12, so that light powder components are preferably taken up by the discharge pipe 12.
  • the end of the discharge pipe 12 has the distance R] _2 ⁇ t R ⁇ _2> Rio- Be d en Examples according to Figures 1 to 3, it was assumed that the feed pipe 10 and the discharge pipe 12 are designed as cylindrical tubes with the same diameter everywhere. These are arranged in such a way that their end pieces lie on a common axis a, which runs horizontally above the bottom of the container 6. However, the ends of the supply line res 10 and the discharge pipe 12 can also be designed as nozzles.
  • the complete device for supplying and discharging the carrier gas is designed as a gas jet pump.
  • a part of the carrier gas, which is used for aerosol formation, is fed through a further feed pipe 16 and through openings 18 to the mixing chamber 20 within the container 6 which is subjected to ultrasound.
  • the pores in a membrane or frit can also be used for the same purpose instead of the openings 18.
  • the supply pipe 10 and the discharge pipe 12 are completed at their end regions with Laval nozzles 22 and 24 in FIG.
  • supersonic speed is achieved when the carrier gas flows into the mixing chamber.
  • the carrier gas continues to expand in the mixing chamber 20 until pressure equals the the gas-powder aerosol prevails, the carrier gas speed further increasing. The latter leads to intensive mixing of the aerosol with the carrier gas.
  • This mixture then enters the damming nozzle 24, the further flow profile depending on the back pressure prevailing in the outlet.
  • a combination of the principles of ultrasound aerosol formation and the gas jet pump indicated by FIG. 5 results in an optimal injection of the powder to be conveyed into the carrier gas flow.
  • the discharge pipe 12 can take the form of a spiral with a suitable number of turns.
  • the powder 8 is coupled to the ultrasound transmitter 40 by a solid body.
  • a sonotrode 38 is provided for this.
  • the sonotrode is preferably hollowed out in the form of a dome at its end provided for this purpose.
  • the container 6 is essentially formed by a hollow body, the bottom of which has an opening through which the sonotrode 38 projects into the interior of the container 6.
  • the bottom of the hollow body is advantageously arranged in the plane of an oscillation node of the sonotrode 38 and is connected to the sonotrode in a vacuum-tight manner at the periphery of the opening.
  • the container 6 is designed on its inside * such that its inside wall forms, for example, the jacket of a truncated cone.
  • the smaller diameter of the truncated cone is chosen so that the powder 8 coming into contact with the wall is returned to the dome-shaped end of the sonotrode 38 by the action of gravity.
  • the container 6 in FIG. 6 contains a feed pipe 10 and an outlet pipe 12 for the carrier gas 14, which receives the powder 8 whirled up by the action of ultrasound on its way through the container.
  • the ultrasound transmitter for the intended use is connected to an ultrasound generator 36, which operates at a frequency in the range of, for example, 20 to 40 kHz with ultrasound amplitudes which function as a function of the particle size of the powder 8 and the desired conveying rate are adjustable.
  • the sonotrode 38 or the ultrasonic bath 4 transmits the ultrasonic vibrations with an amplitude in the range of a few ⁇ m.
  • the powder 8 is thereby whirled up and taken up by the flow of the carrier gas 14 and carried along.
  • an optical device is assigned to the container 6.
  • the container 6 itself may preferably consist of translucent material or have at least two translucent windows 26 and 28, which are arranged in such a way that the powder concentration within the container 6 can be monitored by measuring the absorption or scattering of incident light.
  • a light source available for this is preferably a laser.
  • the measurement signal generated in a detector 32 with the aid of optics 34, which is only indicated in FIG. 1, is used to regulate the power and / or frequency of the ultrasound generator 36. The regulation can also take place by means of a measurement signal which has been obtained in another way. For example, the intensity of the line radiation of the ii. introduced powder contained elements can be used for control.
  • the container 6 or the mixing space 20 can contain electrodes which enable the operation of an electrical discharge in the aerosol.
  • Such an electrical discharge can optionally also be generated without electrodes, for example by coupling microwaves, in a cavity resonator enclosing the container 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

Dans la vaporisation courte durée au plasma, la poudre à vaporiser doit être introduite en continu et sans agglomération dans un chalumeau à plasma. C'est notamment à cet effet que la poudre (8) est en contact direct avec la paroi d'un récipient (6) couplé à une source ultrasonore ou en contact direct avec le système oscillateur ultrasonore et que la poudre (8) située dans le récipient (6) est soulevée en tourbillons sous l'effet des ultrasons et qu'elle est prise par un gaz porteur. Dans le dispositif correspondant, qui comprend un récipient (6) pour la poudre (8) et un transducteur qui produit une sollicitation par ultrasons afin de soulever la poudre (8) en tourbillons, le récipient (6) contient au moins un tuyau d'admission (10) et un tuyau d'évacuation (12) pour le gaz porteur destiné à prendre la poudre (8) soulevée en tourbillons.
PCT/DE1995/000947 1994-07-25 1995-07-19 Procede et dispositif permettant de produire et de doser un aerosol pulverulent WO1996003216A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP95925703A EP0772495B1 (fr) 1994-07-25 1995-07-19 Procede et dispositif permettant de produire et de doser un aerosol pulverulent
DE59504997T DE59504997D1 (de) 1994-07-25 1995-07-19 Verfahren und vorrichtung zur erzeugung und dosierung eines pulveraerosols

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4426264.7 1994-07-25
DE4426264A DE4426264A1 (de) 1994-07-25 1994-07-25 Verfahren und Vorrichtung zur Erzeugung und Dosierung eines Pulveraerosols

Publications (1)

Publication Number Publication Date
WO1996003216A1 true WO1996003216A1 (fr) 1996-02-08

Family

ID=6524059

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/000947 WO1996003216A1 (fr) 1994-07-25 1995-07-19 Procede et dispositif permettant de produire et de doser un aerosol pulverulent

Country Status (3)

Country Link
EP (1) EP0772495B1 (fr)
DE (2) DE4426264A1 (fr)
WO (1) WO1996003216A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19826550A1 (de) * 1998-06-15 1999-12-23 Siemens Ag Verfahren und Vorrichtung zum Erzeugen eines Pulveraerosols

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000504622A (ja) * 1996-02-13 2000-04-18 ドイチェ フォルシュンクザンシュタルト フィーア ルーフトウント ラウムファールト エー．ファウ 空間、特に低圧の空間において静止粒子雲を発生する装置
DE19956260A1 (de) * 1999-11-23 2001-05-31 Inamed Gmbh Abscheidevorrichtung, insbesondere für Trockenpulvermedikamente in Aerosolform
DE102006026576A1 (de) * 2006-06-06 2008-01-10 Aixtron Ag Vorrichtung und Verfahren zum Aufdampfen eines pulverförmigen organischen Ausgangsstoffs
DE102011052118A1 (de) * 2011-07-25 2013-01-31 Eckart Gmbh Verfahren zum Aufbringen einer Beschichtung auf einem Substrat, Beschichtung und Verwendung von Partikeln
JP2022049585A (ja) * 2020-09-16 2022-03-29 パナソニックＩｐマネジメント株式会社 粉体層複合体、塗膜、粉体塗工方法、及び粉体塗工装置

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2105275A (en) * 1934-02-21 1938-01-11 Spray Engineering Co Flock applying apparatus
FR947479A (fr) * 1943-09-14 1949-07-04 Appareil de mise en suspension de poudres dans un courant de gaz
GB688268A (en) * 1950-01-16 1953-03-04 Julius Alexander Neumann Improvements in or relating to flame spraying equipments
FR1421249A (fr) * 1962-08-25 1965-12-17 Siemens Ag Dispositif pour l'amenée régulière d'une poudre dans un pistolet pulvérisateur de plasma
US3305140A (en) * 1965-03-26 1967-02-21 Washington Dry chip sprayer
FR2340136A1 (fr) * 1976-02-05 1977-09-02 Armco Steel Corp Perfectionnements au revetement par depot electrostatique
FR2581324A1 (fr) * 1985-05-03 1986-11-07 Porte Michel Dispositif permettant la projection a debit regulier de produits pulverulents de granulometrie tres fine et ses differentes applications notamment pour les produits abrasifs
EP0297309A2 (fr) * 1987-07-02 1989-01-04 ITW Gema AG Procédé et dispositif de mesure et de régulation du débit de poudre dans une installation de revêtement par poudrage par pulvérisation
DE3826101A1 (de) * 1988-08-01 1990-02-15 Heyer Gmbh Carl Einrichtung zum mechanischen erregen eines in einem behaelter befindlichen fliessfaehigen stoffes mittels ultraschall, mit einer fuellstandsueberwachung fuer den im behaelter befindlichen stoff
EP0441300A2 (fr) * 1990-02-06 1991-08-14 Sony Corporation Traitement d'une surface par un jet de particules submicroniques
EP0557553A1 (fr) * 1992-02-26 1993-09-01 Siemens Aktiengesellschaft Pulvérisateur ultrasonique
FR2690634A1 (fr) * 1992-04-29 1993-11-05 Chronotec Dispositif de micro-pulvérisation générée par ondes ultra-sonores.

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2105275A (en) * 1934-02-21 1938-01-11 Spray Engineering Co Flock applying apparatus
FR947479A (fr) * 1943-09-14 1949-07-04 Appareil de mise en suspension de poudres dans un courant de gaz
GB688268A (en) * 1950-01-16 1953-03-04 Julius Alexander Neumann Improvements in or relating to flame spraying equipments
FR1421249A (fr) * 1962-08-25 1965-12-17 Siemens Ag Dispositif pour l'amenée régulière d'une poudre dans un pistolet pulvérisateur de plasma
US3305140A (en) * 1965-03-26 1967-02-21 Washington Dry chip sprayer
FR2340136A1 (fr) * 1976-02-05 1977-09-02 Armco Steel Corp Perfectionnements au revetement par depot electrostatique
FR2581324A1 (fr) * 1985-05-03 1986-11-07 Porte Michel Dispositif permettant la projection a debit regulier de produits pulverulents de granulometrie tres fine et ses differentes applications notamment pour les produits abrasifs
EP0297309A2 (fr) * 1987-07-02 1989-01-04 ITW Gema AG Procédé et dispositif de mesure et de régulation du débit de poudre dans une installation de revêtement par poudrage par pulvérisation
DE3826101A1 (de) * 1988-08-01 1990-02-15 Heyer Gmbh Carl Einrichtung zum mechanischen erregen eines in einem behaelter befindlichen fliessfaehigen stoffes mittels ultraschall, mit einer fuellstandsueberwachung fuer den im behaelter befindlichen stoff
EP0441300A2 (fr) * 1990-02-06 1991-08-14 Sony Corporation Traitement d'une surface par un jet de particules submicroniques
EP0557553A1 (fr) * 1992-02-26 1993-09-01 Siemens Aktiengesellschaft Pulvérisateur ultrasonique
FR2690634A1 (fr) * 1992-04-29 1993-11-05 Chronotec Dispositif de micro-pulvérisation générée par ondes ultra-sonores.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19826550A1 (de) * 1998-06-15 1999-12-23 Siemens Ag Verfahren und Vorrichtung zum Erzeugen eines Pulveraerosols
WO1999066096A1 (fr) * 1998-06-15 1999-12-23 Siemens Aktiengesellschaft Procede et dispositif pour la production d'un aerosol pulverulent, ainsi que son utilisation
DE19826550C2 (de) * 1998-06-15 2001-07-12 Siemens Ag Verfahren und Vorrichtung zum Erzeugen eines Pulveraerosols

Also Published As

Publication number Publication date
DE4426264A1 (de) 1996-02-01
DE59504997D1 (de) 1999-03-11
EP0772495A1 (fr) 1997-05-14
EP0772495B1 (fr) 1999-01-27

Similar Documents

Publication Publication Date Title
DE69306128T2 (de) Herstellung von granulaten
EP0300319B1 (fr) Dispositif résonant à commande piézoélectrique pour atomiser un fluide par ultrasons
EP0308600B1 (fr) Appareil pour la pulvérisation ultra-sonore d'un fluide
DE3735787C2 (fr)
CA1228459A (fr) Methode et dispositif d'atomisation de metaux en fusion pour l'obtention d'une poudre finement granulee
JP4524410B2 (ja) 反応剤供給装置
US4347983A (en) Hyperbolic frequency modulation related to aero/hydrodynamic flow systems
DE69806504T2 (de) Verfahren zur erzeugung von hohlen tröpfchen
DE3069061D1 (en) Ultrasonic atomiser for liquid fuels
DE102004045770B3 (de) Trockeneisstrahlvorrichtung
WO1996003216A1 (fr) Procede et dispositif permettant de produire et de doser un aerosol pulverulent
DE2842232A1 (de) Verfahren und vorrichtung zum zerstaeuben von fluessigkeiten, suspensionen und emulsionen, agglomerierten staeuben bzw. pulvern sowie mischungen derselben
US20040251320A1 (en) Nozzle for coating surfaces
JPH04227836A (ja) 液体と固体を混合する方法及びそのための装置
EP1821083B1 (fr) Dispositif de dosage destiné au dosage d'une poudre
EP1186348B1 (fr) Procédé et dispositif de pulvérisation de liquides
US3434698A (en) Fluid mixing,moving and atomizing methods and apparatus
DE2846315C2 (fr)
EP1044692B1 (fr) Préparation et dispositif pour application sèche de produits à des supports pulvérulents
US4580723A (en) Method for atomizing dispersions or solutions containing particles
DE1964584A1 (de) Verfahren und Vorrichtung zum Herstellen von Metallpulvern
DE831980C (de) Verfahren und Vorrichtung zur Zerstaeubung von Fluessigkeitsgemischen
DE3734905A1 (de) Geraet zum zerstaeuben eines mediums
JPH0135770B2 (fr)
WO2023077176A1 (fr) Atomiseur à ultrasons

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 1995925703

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1995925703

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1995925703

Country of ref document: EP