EP0437155B1 - Verfahren zur Ultraschallzerstäubung einer Flüssigkeitslösung und Tröpfchendiffusor zur Durchführung dieses Verfahrens - Google Patents

Verfahren zur Ultraschallzerstäubung einer Flüssigkeitslösung und Tröpfchendiffusor zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP0437155B1
EP0437155B1 EP90440014A EP90440014A EP0437155B1 EP 0437155 B1 EP0437155 B1 EP 0437155B1 EP 90440014 A EP90440014 A EP 90440014A EP 90440014 A EP90440014 A EP 90440014A EP 0437155 B1 EP0437155 B1 EP 0437155B1
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EP
European Patent Office
Prior art keywords
liquid solution
micro
ultrasounds
ultrasonic waves
droplets
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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
EP90440014A
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English (en)
French (fr)
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EP0437155A1 (de
Inventor
Thierry Letartre
Bernard Delannoy
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Laboratories Anios SA
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Laboratories Anios SA
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Publication date
Application filed by Laboratories Anios SA filed Critical Laboratories Anios SA
Publication of EP0437155A1 publication Critical patent/EP0437155A1/de
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Publication of EP0437155B1 publication Critical patent/EP0437155B1/de
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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
    • 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

Definitions

  • the invention relates to a method of micro-spraying a liquid solution by ultrasound as well as to a micro-droplet diffuser for vaporizing a liquid solution, intended for example in the medical environment for emission vapors of disinfectants, for asepsis of premises, instruments or others.
  • liquid micro-droplets for example of a disinfectant
  • the first usable apparatus comprises a propeller system, the propeller of which is surrounded by baffles and comprises a perforated hub, through which the solution to be sprayed is injected.
  • the hub has lateral orifices through which the liquid escapes in droplets. Due to the strong centrifugal force prevailing at this level, the droplets are ejected radially with a large live force.
  • a static grid on which the droplets are sprayed in a mist then entrained by the main ventilation.
  • the non-sprayed liquid part is collected in the bottom of the device where a pump re-injects the liquid into the propeller hub.
  • the second spraying technique employs the nozzle principle, in which the liquid to be sprayed is injected under pressure then, at the rear of the nozzle, a compressed air outlet nozzle is placed which allows the emitted droplets to be entrained.
  • This type of installation has a better efficiency than that described above but requires a pump and a compressor which greatly increases the cost of the installation.
  • the control of micro-spraying is not guaranteed and one can encounter phenomena of supersaturation.
  • a diffuser being to vaporize a liquid, it is important that, in the technique illustrated, the spraying results in obtaining droplets of the smallest possible dimension. Indeed, in this case, the ratio between the surface and the mass is optimum and the vaporization is easy since it suffices to supply the droplet with a very small amount of heat to result in its total vaporization.
  • micro-droplets which form this mist can be entrained by an air current in which the micro-droplets evaporate.
  • This principle of micro-spraying offers great advantages, particularly in terms of the powers involved and the dimensions of micro-droplets formed.
  • Document GB-A-1,069,048 discloses a method of micro-spraying a liquid solution by ultrasound capable of forming a mist of medicinal products such as for medical inhalation, according to which ultrasound is generated at within a bath of liquid solution and the ultrasonic waves are focused on the surface of a bath in the form of a vertical "geyser".
  • the main object of the present invention is to present a method of micro-spraying a liquid solution by ultrasound which offers the advantages of being able to deliver a high flow rate compatible with the capacities required for disinfecting the premises and with which there is has a mastery of the dimension of micro-droplets.
  • the diffuser of the present invention is perfectly compatible with medical applications for disinfecting premises where it is very efficient, in particular in terms of performance.
  • the method of micro-spraying a liquid solution by ultrasound intended in particular to form a mist of disinfectant products, for sanitizing medical or other premises, according to which ultrasound is generated within 'a bath of liquid solution and the said ultrasonic waves are focused on the surface of the bath, is characterized in that the beam of ultrasonic waves is directed with an oblique incidence relative to the surface of the solution liquid to form a homogeneous fountain in an arc.
  • the micro-droplet diffuser for the vaporization of a liquid solution intended in particular for the emission of vapor from disinfectant products, and designed for implementing the method according to the invention, comprising a device for producing micro-droplets by ultrasound, which is placed in an air circulation vein to entrain and diffuse the microdroplets, and comprising means for generating ultrasound within the liquid solution and for focusing on the surface of the solution liquid ultrasound, these means being in the form of a transducer, is characterized in that said transducer is placed in the liquid solution according to an arrangement such that the beam of ultrasonic waves is emitted with an incidence oblique to the surface of the liquid solution in order to obtain a homogeneous fountain in an arc.
  • the micro-droplet diffuser for vaporizing a liquid solution intended in particular for the emission of vapor from disinfectant products and designed for carrying out the process of the invention, comprising a device for production of micro-droplets by ultrasound which is placed in an air circulation vein to entrain and diffuse the micro-droplets and which comprises means for focusing on the surface of the liquid solution the ultrasound delivered by a transducer within the liquid solution, is characterized in that the means for focusing the ultrasound concentrate and direct the ultrasound delivered by said transducer to the surface of the liquid solution with an oblique incidence relative to the surface of the liquid solution to form a homogeneous fountain in an arc.
  • the present invention relates to a micro-spraying process of a liquid solution by ultrasound as well as a micro-droplet diffuser for the vaporization of a liquid solution allowing the implementation of said process. It will find its application in particular in the medical environment for the disinfection of premises by diffusion of a disinfectant product.
  • a suitable chemical is sprayed into the atmosphere of the room using a diffuser.
  • two types of diffusers are mainly used, which are characterized according to their principle of spraying the liquid solution, namely with a fan or a nozzle, as mentioned above.
  • the bath 1 of liquid solution intended to be micro-sprayed as well as a source 2 of ultrasound.
  • the frequency used for ultrasound emissions is not imposed; however the range is from 0.5 megahertz to 5 megahertz is recommended.
  • the ultrasonic waves 3 are focused on the surface 4 of the bath 1. Under these conditions, it is now believed that micro-bubbles are created by cavitation which burst on the surface of the liquid and which will generate a significant production of micro-droplets and that it has a reduced size, less than 0.3 microns.
  • the fountain 5 forms a jet of cylindrical liquid which flows regularly. In general, for a given power, the regularity of flow of the fountain 5 is optimum.
  • the micro-bubbles 7, created inside the fountain 5, explode on the surface and form the aerosol 6. Thanks to the focusing in a zone 4 of the surface of the liquid , the acoustic waves propagate in the jet of the fountain 5 under high power, hence the creation of numerous micro-bubbles 7.
  • the inclined fountain of the invention has an upper surface for a given energy and flow rate.
  • the power of ultrasound generally ranges from about 1 to 3 watts.
  • the fountain has an ideal conformation that must be sought.
  • FIG. 2 shows the use of a source 2 whose profile concentrates the radiated waves 3 towards a point 4 of the liquid surface.
  • a transducer 2 the surface of which has been hollowed out in a concave profile in order to direct the waves towards a focal point, gives certain results, but not fully satisfactory.
  • FIG. 4 represents a diffuser 9 of micro-droplets for the vaporization of a liquid solution 10 authorizing an implementation of the method described above.
  • the diffuser 9 comprises a device 11 for producing micro-droplets by ultrasound, placed in a vein 12 for air circulation, for entraining and diffusing into the atmosphere the micro-droplets produced.
  • the circulation of air in the stream 12 is ensured by means of a motorized propeller 13.
  • the device 11 for producing micro-droplets firstly comprises a source 14 of ultrasound immersed in the bath 10 of solution to be vaporized and means 15 for concentrating the ultrasounds 16 on the surface 17 of the liquid solution 10.
  • the means for focusing the ultrasonic radiation are in the form of a reflection surface 18 of ultrasound with a geometric profile suitable for concentrating the radiation at a point 17 of the liquid level 10.
  • the reflecting surface 18 is formed directly by the wall of the container containing the liquid solution to be vaporized.
  • This container has at its upper part an opening through which the micro-droplets of mist are entrained by the circulation of air set in motion by the fan 13.
  • Figure 5 shows in detail the embodiment of the source of ultrasound 14. This is only an exemplary embodiment and other implementations could of course be adopted.
  • the transducer used is a pellet 19 of piezoelectric material such as aged ceramic.
  • the front face of the patch 19 rests on a metal cup 20, for example made of stainless steel which has an electrical connection terminal.
  • the tablet 19 and the cup 20 are placed in a housing 22 preferably made of an elastic or rubberized material.
  • a second cup 23 rests on the back of the pad 19 by means of lugs 24 which provide electrical contact.
  • the cup 23 also includes an electrical connection lug 25. The welds must be avoided and the pellet is cooled on the liquid side.
  • the resonant frequency of the ultrasound source is adjusted.
  • the diameter of the pellet should preferably remain of reduced size, in particular of around twenty millimeters for a frequency of two megahertz, this to limit the appearance of lobes of secondary radiation.
  • FIG. 6 represents the desired radiation diagram for a source of ultrasound in the context of the present invention.
  • the patch of the transducer comprises two metallized surfaces 26 and 27 respectively of different surfaces. With such an asymmetry, the radiation lobe 28 is unique, the traditional secondary lobes are completely eliminated. The use of an apodized tablet 19 is recommended.
  • the spraying of approximately two liters per hour of liquid solution is considered using a fan of approximately one thousand cubic meters per hour of flow and several independent sources of ultrasound and essentially of different frequencies.

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  • Special Spraying Apparatus (AREA)
  • Cosmetics (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Claims (9)

  1. Verfahren zum Ultraschall-Mikrofeinzerstäuben einer flüssigen Lösung, nämlich zum Bilden eines Entkeimungsmittelnebels, zum Keimfreimachen von medizinischen Räumen oder dergleichen, bei dem Ultraschälle (3) innerhalb eines Bades (1) einer flüssigen Lösung (10) erzeugt und die genannten Ultraschallwellen (3) an der Oberfläche des Bades (1) fokalisiert werden, dadurch gekennzeichnet, daß das Ultraschallwellenbündel (3) mit einem geneigten Einfall bezüglich der Oberfläche der flüssigen Lösung (1, 10) gerichtet wird, um eine homogene kreisbogenförmige Quelle zu bilden.
  2. Verfahren zum Ultraschall-Mikrofeinzerstäuben einer flüssigen Lösung nach Anspruch 1, dadurch gekennzeichnet, daß die von einem Transducer (2) ausgestrahlten Ultraschallwellen (3) durch Rückstrahlung auf eine geeignete geometrische Oberfläche (8) fokalisiert werden, um das Ultraschallwellenbündel (3) nach den Gesetzen der Wellenrückstrahlung mit dem genannten geneigten Einfall auf eine Oberfläche zu richten.
  3. Verfahren zum Ultraschall-Mikrofeinzerstäuben einer flüssigen Lösung nach Anspruch 2, dadurch gekennzeichnet, daß die Leistung und/oder die Frequenz der Ultraschallwellen (3) eingestellt werden, um eine Quelle (5) einer Länge von etwa einem bis zehn Zentimetern und eines Durchmessers von etwa drei bis fünf Millimetern zu erhalten.
  4. Mikrotröpfchenzerstäuber zum Zerstäuben einer flüssigen Lösung (10), nämlich zum Ausstrahlen von Entkeimungsmitteldampf, entworfen für die Verwendung des Verfahrens nach Anspruch 1, umfassend eine Vorrichtung (11) zum Erzeugen durch Ultraschälle von Mikrotröpfchen, die in einen Luftumlaufstrom (12) aufgestellt wird, um die Mikrotröpfchen mitzunehmen und zu verbreiten, und Mittel zum Erzeugen von Ultraschällen (3) innerhalb der flüssigen Lösung (10) und zum Fokalisieren der genannten Ultraschälle an der Oberfläche der genannten flüssigen Lösung umfaßt, wobei diese Mittel als ein Transducer (14) ausgestaltet sind, dadurch gekennzeichnet, daß der genannte Transducer (14) nach einer derartigen Anordnung in der flüssigen Lösung (10) aufgestellt ist, daß das Ultraschallwellenbündel (3) mit einem geneigten Einfall bezüglich der Oberfläche der flüssigen Lösung (10) ausgestrahlt wird, um eine homogene kreisbogenförmige Quelle (5) zu erhalten.
  5. Mikrotröpfchenzerstäuber zum Zerstäuben einer flüssigen Lösung (10), nämlich zum Ausstrahlen von Entkeimungsmitteldampf, entworfen für die Verwendung des Verfahrens nach Anspruch 1, umfassend eine Vorrichtung (11) zum Erzeugen durch Ultraschälle von Mikrotröpfchen, die in einen Luftumlaufstrom (12) aufgestellt wird, um die Mikrotröpfchen mitzunehmen und zu verbreiten, und Mittel (15) zum Fokalisieren der von einem Transducer (14) innerhalb der flüssigen Lösung (10) ausgestrahlten Ultraschälle an der Oberfläche der flüssigen Lösung umfaßt, dadurch gekennzeichnet, daß die Mittel (15) zum Fokalisieren der Ultraschälle (3) die vom genannten Transducer (14) ausgestrahlten Ultraschälle (3) an der Oberfläche (17) der flüssigen Lösung (10) mit einem geneigten Einfall bezüglich der Oberfläche der flüssigen Lösung (10) konzentrieren und richten, um eine homogene kreisbogenförmige Quelle (5) zu bilden.
  6. Mikrotröpfchenzerstäuber nach Anspruch 5, dadurch gekennzeichnet, daß die Mittel zum Konzentrieren und Richten der Ultraschälle (3) als eine Rückstrahlungsfläche (15) für die Ultraschälle (16) mit geeignetem geometrischem Profil ausgestaltet sind, um das genannte Ultraschallwellenbündel nach den Gesetzen der Wellenrückstrahlung mit dem genannten geneigten Einfall auf eine Oberfläche zu richten.
  7. Mikrotröpfchenzerstäuber nach Anspruch 6, dadurch gekennzeichnet, daß die Rückstrahlungsfläche (15) von der Wand des die zu zerstäubende flüssige Lösung (10) enthaltenden Behälters gebildet ist.
  8. Mikrotröpfchenzerstäuber nach Anspruch 6, dadurch gekennzeichnet, daß die Rückstrahlungsfläche von einem perfekt geschliffenen und sehr homogenen, parabelförmigen Metallspiegel gebildet ist.
  9. Mikrotröpfchenzerstäuber nach irgendeinem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß der Transducer (14) apodisiert ist.
EP90440014A 1989-12-01 1990-02-20 Verfahren zur Ultraschallzerstäubung einer Flüssigkeitslösung und Tröpfchendiffusor zur Durchführung dieses Verfahrens Expired - Lifetime EP0437155B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8916424 1989-12-01
FR8916424A FR2655279B1 (fr) 1989-12-01 1989-12-01 Procede de micro-pulverisation d'une solution par ultra son et diffuseur de micro-gouttelettes mettant en óoeuvre le dit dispositif.

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Publication Number Publication Date
EP0437155A1 EP0437155A1 (de) 1991-07-17
EP0437155B1 true EP0437155B1 (de) 1995-02-15

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EP90440014A Expired - Lifetime EP0437155B1 (de) 1989-12-01 1990-02-20 Verfahren zur Ultraschallzerstäubung einer Flüssigkeitslösung und Tröpfchendiffusor zur Durchführung dieses Verfahrens

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EP (1) EP0437155B1 (de)
AT (1) ATE118378T1 (de)
DE (1) DE69016990D1 (de)
ES (1) ES2071070T3 (de)
FR (1) FR2655279B1 (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6478754B1 (en) 2001-04-23 2002-11-12 Advanced Medical Applications, Inc. Ultrasonic method and device for wound treatment
US6533803B2 (en) 2000-12-22 2003-03-18 Advanced Medical Applications, Inc. Wound treatment method and device with combination of ultrasound and laser energy
US6601581B1 (en) 2000-11-01 2003-08-05 Advanced Medical Applications, Inc. Method and device for ultrasound drug delivery
US6623444B2 (en) 2001-03-21 2003-09-23 Advanced Medical Applications, Inc. Ultrasonic catheter drug delivery method and device
US6761729B2 (en) 2000-12-22 2004-07-13 Advanced Medicalapplications, Inc. Wound treatment method and device with combination of ultrasound and laser energy
US6960173B2 (en) 2001-01-30 2005-11-01 Eilaz Babaev Ultrasound wound treatment method and device using standing waves
US6964647B1 (en) 2000-10-06 2005-11-15 Ellaz Babaev Nozzle for ultrasound wound treatment
US7713218B2 (en) 2005-06-23 2010-05-11 Celleration, Inc. Removable applicator nozzle for ultrasound wound therapy device
US7785277B2 (en) 2005-06-23 2010-08-31 Celleration, Inc. Removable applicator nozzle for ultrasound wound therapy device
US7914470B2 (en) 2001-01-12 2011-03-29 Celleration, Inc. Ultrasonic method and device for wound treatment
US8235919B2 (en) 2001-01-12 2012-08-07 Celleration, Inc. Ultrasonic method and device for wound treatment
US8491521B2 (en) 2007-01-04 2013-07-23 Celleration, Inc. Removable multi-channel applicator nozzle
US9428613B2 (en) 2010-09-10 2016-08-30 Basf Se Process for producing polyamide that is stable during processing

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2690510A1 (fr) * 1992-04-28 1993-10-29 Techsonic Sarl Procédé de refroidissement d'un gaz par vaporisation d'un liquide par ultrasons et appareils de refroidissement mettant en Óoeuvre le dit dispositif.
FR2690634B1 (fr) * 1992-04-29 1994-10-14 Chronotec Dispositif de micro-pulvérisation générée par ondes ultra-sonores.
FR2716415B1 (fr) * 1994-02-22 1996-04-05 Renault Dispositif distributeur d'air dans un habitacle de véhicule automobile.
FR2721839B1 (fr) * 1994-07-04 1996-10-25 Imra Europe Sa Dispositif de pulverisation, notamment d'eau sous forme de micro-goutelettes, apte a fonctionner dans un milieu non stationnaire
RU2152829C2 (ru) * 1996-03-13 2000-07-20 Тоо "Ракурс" Устройство для ультразвукового распыления жидких сред
RU2234381C2 (ru) * 2002-08-12 2004-08-20 Институт прикладной механики УрО РАН Распылитель жидкости
RU2337766C1 (ru) * 2007-05-28 2008-11-10 Институт прикладной механики УрО РАН Распылитель жидкости
FR2918894B1 (fr) * 2007-07-16 2010-10-08 Sanivap Dispositif et procede de desinfection de surfaces
JP5805198B2 (ja) † 2010-09-10 2015-11-04 ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ 加工安定性ポリアミドの製造方法
EP3074089B1 (de) 2013-11-26 2025-03-05 Alliqua Biomedical, Inc. Systeme zur herstellung und verabreichung von ultraschalltherapien für wundbehandlung und -heilung
RU2577582C1 (ru) * 2014-10-20 2016-03-20 Федеральное государственное бюджетное учреждение науки Институт механики Уральского отделения Российской академии наук Пластинчатый распылитель жидкости
FR3029431A1 (fr) * 2014-12-05 2016-06-10 Areco Finances Et Tech - Arfitec Dispositif de pulverisation compact
FR3053610B1 (fr) 2016-07-11 2020-12-18 Anios Lab Sarl Dispositif de nebulisation d'un produit liquide
CN112978846B (zh) * 2019-12-16 2023-11-03 中国科学院过程工程研究所 工业废水微小液滴光反应装置及方法
FR3112957A1 (fr) 2020-07-31 2022-02-04 Areco Finances Et Technologie - Arfitec Procédé et installation aéraulique pour la désinfection d’un local

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GB1069048A (en) * 1964-02-10 1967-05-17 Devilbiss Co Method and apparatus for producing aerosols
CH566822A5 (de) * 1973-06-20 1975-09-30 Stern Freres Sa
JPS56139166A (en) * 1980-03-31 1981-10-30 Osaka Gas Co Ltd Ultrasonic spraying apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6964647B1 (en) 2000-10-06 2005-11-15 Ellaz Babaev Nozzle for ultrasound wound treatment
US6601581B1 (en) 2000-11-01 2003-08-05 Advanced Medical Applications, Inc. Method and device for ultrasound drug delivery
US6533803B2 (en) 2000-12-22 2003-03-18 Advanced Medical Applications, Inc. Wound treatment method and device with combination of ultrasound and laser energy
US6761729B2 (en) 2000-12-22 2004-07-13 Advanced Medicalapplications, Inc. Wound treatment method and device with combination of ultrasound and laser energy
US8235919B2 (en) 2001-01-12 2012-08-07 Celleration, Inc. Ultrasonic method and device for wound treatment
US7914470B2 (en) 2001-01-12 2011-03-29 Celleration, Inc. Ultrasonic method and device for wound treatment
US6960173B2 (en) 2001-01-30 2005-11-01 Eilaz Babaev Ultrasound wound treatment method and device using standing waves
US6623444B2 (en) 2001-03-21 2003-09-23 Advanced Medical Applications, Inc. Ultrasonic catheter drug delivery method and device
US6663554B2 (en) 2001-04-23 2003-12-16 Advanced Medical Applications, Inc. Ultrasonic method and device for wound treatment
US6478754B1 (en) 2001-04-23 2002-11-12 Advanced Medical Applications, Inc. Ultrasonic method and device for wound treatment
US7713218B2 (en) 2005-06-23 2010-05-11 Celleration, Inc. Removable applicator nozzle for ultrasound wound therapy device
US7785277B2 (en) 2005-06-23 2010-08-31 Celleration, Inc. Removable applicator nozzle for ultrasound wound therapy device
US8491521B2 (en) 2007-01-04 2013-07-23 Celleration, Inc. Removable multi-channel applicator nozzle
US9428613B2 (en) 2010-09-10 2016-08-30 Basf Se Process for producing polyamide that is stable during processing

Also Published As

Publication number Publication date
ES2071070T3 (es) 1995-06-16
EP0437155A1 (de) 1991-07-17
ATE118378T1 (de) 1995-03-15
FR2655279B1 (fr) 1993-09-17
FR2655279A1 (fr) 1991-06-07
DE69016990D1 (de) 1995-03-23

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