EP0689879A1 - Ultrasonic atomizer - Google Patents

Ultrasonic atomizer Download PDF

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Publication number
EP0689879A1
EP0689879A1 EP95110003A EP95110003A EP0689879A1 EP 0689879 A1 EP0689879 A1 EP 0689879A1 EP 95110003 A EP95110003 A EP 95110003A EP 95110003 A EP95110003 A EP 95110003A EP 0689879 A1 EP0689879 A1 EP 0689879A1
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EP
European Patent Office
Prior art keywords
ultrasonic atomizer
hat
elevation
piezoceramic
shaped elevation
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Granted
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EP95110003A
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German (de)
French (fr)
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EP0689879B1 (en
Inventor
Olaf Dipl.-Phys. Haack
Randolf Dr. Mock
Klaus Dipl.-Ing. Van Der Linden
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Siemens AG
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Siemens AG
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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

Definitions

  • the invention relates to an ultrasonic atomizer for liquid atomization.
  • a drug such as. B. a bronchospasmolytic to atomize into a respirable aerosol.
  • EP 0 246 515 A1 discloses an ultrasound MHz oscillator, in particular for liquid atomization, in which an amplitude transformer is attached to a piezoceramic disk, the amplitude transformer - starting from the piezoceramic disk - initially tapering and then in a widening atomizing plate ends.
  • This atomizer plate has a concave surface ("concave mirror") for receiving the liquid to be atomized.
  • the invention has for its object to provide an ultrasonic atomizer in which the energy losses mentioned above are kept relatively small due to the reflection of the ultrasonic waves at the liquid / air interface and the relatively small volumes of liquid, eg. B. about 50 ul, atomized so that a high proportion of respirable droplets with a diameter of less than 10 microns.
  • an ultrasonic atomizer which has an electrically excitable piezoceramic and a coupling body which is operatively connected to the piezoceramic, the surface of the coupling body which comes into contact with the liquid to be atomized being designed as a hat-shaped elevation, and the hat-shaped elevation and the coupling body consist of a solid metal material.
  • a hat-shaped elevation generally means an elevation with an essentially convex surface.
  • substantially convex should also be understood to mean that the top of the elevation can be flattened to a plateau.
  • the survey does not necessarily have to be rotationally symmetrical.
  • a particularly advantageous embodiment of the invention provides for the coupling body at the base of the hat-shaped elevation to be designed as a disk which extends beyond the edge of the elevation, the disk on the side facing away from the elevation Side has a ring for receiving the piezoceramic.
  • the piezoceramic which is usually designed as a disk, can be fixed in a simple manner.
  • the disk protruding over the edge of the elevation represents an acoustic bottleneck for the excitation energy.
  • the energy loss when the ultrasound is transferred into a surrounding housing is negligible, and on the other hand, the excitation energy is thereby coupled into the hat-shaped elevation with a particularly large proportion and is thus used for liquid atomization.
  • the ring for the positive reception of the piezo body is provided on the side facing away from the elevation, an undesired accumulation of liquid at the base of the hat-shaped elevation is avoided. Furthermore, this ring can serve as a clamp in the manufacturing process of the coupling body, provided that it is rotated from metal, for example.
  • the coupling body advantageously consists of metal, preferably titanium or a titanium alloy.
  • the hat-shaped elevation is essentially rotationally symmetrical. It can preferably be parabolic or elliptical in section, but also exponential.
  • FIG. 1 shows a schematic representation of a longitudinal section through an ultrasonic atomizer.
  • the ultrasonic atomizer 2 comprises a piezoceramic disk 4, a coupling body 6 and a membrane body 8.
  • the piezoceramic disk 4 is provided with electrodes, not shown in the exemplary embodiment, which are not connected to one shown, the piezoceramic electrical resonant circuit are connected.
  • the piezoceramic disk 4 is operated in thickness resonance, ie the sound waves are emitted essentially parallel to the axis of rotational symmetry 10.
  • the coupling body 6 consists of a single metallic piece and is made of titanium or a titanium alloy.
  • the coupling body 6 has three different sections:
  • the first section is a hat-shaped, here rotationally symmetrical parabolic elevation 12, which in the exemplary embodiment has a height of approximately 4 mm and a diameter of approximately 10 mm.
  • the second section begins at the base 14 of the parabolic elevation 12 and extends as a disk 16 well beyond the edge of the elevation 12.
  • the third section represents a ring 18 which is arranged on the side of the disk 16 facing away from the elevation 12.
  • a membrane body 8 and the piezoceramic disk 4 are glued into this ring 18.
  • the membrane body 8 is preferably made of plastic. Deviating from the figure, the use of the membrane body can also be dispensed with.
  • the ultrasonic atomizer then does not require any additional active ingredient, which may improve its function under certain circumstances.
  • a quantity of liquid f (usually relatively small in medical applications) is dripped onto the highest point of the elevation 12 via a feed 20.
  • the liquid f is distributed relatively uniform and approximately equally thick liquid height over the surface of the elevation 12, ie there is wetting of the surface with the liquid to be atomized f.
  • the excitation of the piezoceramic disk 4 is switched on, the liquid f uniformly distributed over the surface of the elevation 12 is atomized.
  • the shape of the elevation 12 should be noted that it does not necessarily have to be rotationally symmetrical.
  • the elevation 12 can also be flattened at the highest point without a "concave mirror" which acts as a collecting basin for the liquid to be atomized.

Abstract

The vaporiser has an electrically-operated piezoceramic element (4) and an associated coupling element (6), made of a metal material, e.g. Ti, having an integral raised spherical surface (12), onto which the fluid to be vaporised is dropped. Pref. the coupling element has a disc section (16) around the peripheral edge of the raised spherical surface and an outer thicker ring section (18), cooperating to provide a recess for receiving the piezoceramic element. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Ultraschallzerstäuber zur Flüssigkeitszerstäubung.The invention relates to an ultrasonic atomizer for liquid atomization.

Bei einer Vielzahl von technischen Anwendungen ist es erforderlich, aus Flüssigkeiten Aerosole zu erzeugen. Insbesondere für medizinische Anwendungen ist es erforderlich, beispielsweise ein Medikament, wie z. B. ein Bronchospasmolytikum, zu einem lungengängigen Aerosol zu zerstäuben.A large number of technical applications require the production of aerosols from liquids. In particular for medical applications, it is necessary, for example, a drug, such as. B. a bronchospasmolytic to atomize into a respirable aerosol.

In der EP 0 246 515 A1 ist ein Ultraschall-MHz-Schwinger, insbesondere zur Flüssigkeitszerstäubung, offenbart, bei dem ein Amplitudentransformator auf einer Piezokeramikscheibe befestigt ist, wobei der Amplitudentransformator - ausgehend von der Piezokeramikscheibe - sich zunächst verjüngt und anschließend in einem sich verbreiternden Zerstäuberteller endet. Dieser Zerstäuberteller weist eine konkave Oberfläche ("Hohlspiegel") zur Aufnahme der zu zerstäubenden Flüssigkeit auf. Beim Betrieb eines solchen Ultraschallzerstäubers hat es sich gezeigt, daß hohe Energieverluste durch die Reflexion der Ultraschallwellen an der Grenzschicht Flüssigkeit/Luft bei nicht geeigneter Flüssigkeitshöhe im Zerstäuberteller auftreten.EP 0 246 515 A1 discloses an ultrasound MHz oscillator, in particular for liquid atomization, in which an amplitude transformer is attached to a piezoceramic disk, the amplitude transformer - starting from the piezoceramic disk - initially tapering and then in a widening atomizing plate ends. This atomizer plate has a concave surface ("concave mirror") for receiving the liquid to be atomized. When operating such an ultrasonic atomizer, it has been shown that high energy losses occur due to the reflection of the ultrasonic waves at the liquid / air interface at an unsuitable liquid level in the atomizing plate.

Der Erfindung liegt die Aufgabe zugrunde, einen Ultraschallzerstäuber anzugeben, bei dem die vorstehend angesprochenen Energieverluste durch die Reflexion der Ultraschallwellen an der Grenzschicht Flüssigkeit/Luft relativ klein gehalten werden und der relativ kleine Flüssigkeitsvolumina, z. B. ca. 50 µl, so zerstäubt, daß ein hoher Anteil von lungengängigen Tröpfchen mit einem Durchmesser kleiner als 10 µm entsteht.The invention has for its object to provide an ultrasonic atomizer in which the energy losses mentioned above are kept relatively small due to the reflection of the ultrasonic waves at the liquid / air interface and the relatively small volumes of liquid, eg. B. about 50 ul, atomized so that a high proportion of respirable droplets with a diameter of less than 10 microns.

Diese Aufgabe wird erfindungsgemäß gelöst durch einen Ultraschallzerstäuber, der eine elektrisch anregbare Piezokeramik und einen mit der Piezokeramik in Wirkverbindung stehenden Koppelkörper aufweist, wobei die mit der zu zerstäubenden Flüssigkeit in Berührung kommende Oberfläche des Koppelkörpers als hutförmige Erhebung ausgebildet ist, und wobei die hutförmige Erhebung und der Koppelkörper aus einem metallischen Vollmaterial bestehen.This object is achieved according to the invention by an ultrasonic atomizer which has an electrically excitable piezoceramic and a coupling body which is operatively connected to the piezoceramic, the surface of the coupling body which comes into contact with the liquid to be atomized being designed as a hat-shaped elevation, and the hat-shaped elevation and the coupling body consist of a solid metal material.

Hierbei ist mit hutförmiger Erhebung ganz allgemein eine Erhebung mit einer im wesentlichen konvexen Oberfläche gemeint. Unter "im wesentlich konvex" soll auch verstanden sein, daß die Oberseite der Erhebung zu einem Plateau abgeflacht sein kann. Die Erhebung muß nicht zwingend rotationssymmetrisch ausgestaltet sein.Here, a hat-shaped elevation generally means an elevation with an essentially convex surface. "Substantially convex" should also be understood to mean that the top of the elevation can be flattened to a plateau. The survey does not necessarily have to be rotationally symmetrical.

Auf diese Weise ist es möglich, den Ultraschall von der Piezokeramik in den Koppelkörper einzukoppeln und im oberen Bereich der Erhebung zu fokussieren. Bei der Benetzung der Oberfläche mit der zu zerstäubenden Flüssigkeit wird ein ausreichend hoher Anteil der Ultraschallenergie in die Flüssigkeit eingekoppelt, weil sich infolge der im wesentlichen konvexen Oberfläche eine während des Zerstäubungsprozesses besonders vorteilhafte Flüssigkeitshöhe (Benetzung) einstellt, so daß eine vollständige Zerstäubung eines relativ kleinen Flüssigkeitsvolumens mit einem hohen Anteil lungengängiger Tröpfchen erreicht wird. Desweiteren kann die mit der zu zerstäubenden Flüssigkeit in Berührung kommende Oberfläche des Koppelkörpers problemlos gereinigt werden, weil auf der hutförmigen Erhebung, d. h. auf der im wesentlichen konvexen Oberfläche der Erhebung, keine Vertiefungen und keine Hinterschnitte vorgesehen sind.In this way it is possible to couple the ultrasound from the piezoceramic into the coupling body and to focus it in the upper region of the elevation. When the surface is wetted with the liquid to be atomized, a sufficiently high proportion of the ultrasonic energy is injected into the liquid because, due to the essentially convex surface, a liquid height (wetting) that is particularly advantageous during the atomization process is established, so that a complete atomization of a relatively small amount Liquid volume is achieved with a high proportion of respirable droplets. Furthermore, the surface of the coupling body that comes into contact with the liquid to be atomized can be cleaned without any problems, because on the hat-shaped elevation, ie. H. no depressions and no undercuts are provided on the essentially convex surface of the elevation.

Eine besonders vorteilhafte Ausgestaltung der Erfindung sieht vor, den Koppelkörper an der Basis der hutförmigen Erhebung als über den Rand der Erhebung hinausreichende Scheibe auszubilden, wobei die Scheibe auf der von der Erhebung abgewandten Seite einen Ring zur Aufnahme der Piezokeramik aufweist. Auf diese Weise kann die Piezokeramik, die üblicherweise als Scheibe ausgebildet ist, in einfacher Weise fixiert werden. Die über den Rand der Erhebung hinausragende Scheibe stellt einen akustischen Engpaß für die Anregungsenergie dar.A particularly advantageous embodiment of the invention provides for the coupling body at the base of the hat-shaped elevation to be designed as a disk which extends beyond the edge of the elevation, the disk on the side facing away from the elevation Side has a ring for receiving the piezoceramic. In this way, the piezoceramic, which is usually designed as a disk, can be fixed in a simple manner. The disk protruding over the edge of the elevation represents an acoustic bottleneck for the excitation energy.

Hierdurch ist zum einen der Energieverlust beim Übergang des Ultraschalls in ein umgebendes Gehäuse vernachlässigbar, und zum anderen wird die Anregungsenergie hierdurch mit einem besonders großen Anteil in die hutförmige Erhebung eingekoppelt und damit zur Flüssigkeitszerstäubung genutzt. Weil der Ring zur formschlüssigen Aufnahme des Piezokörpers auf der von der Erhebung abgewandten Seite vorgesehen ist, wird eine unerwünschte Flüssigkeitsansammlung an der Basis der hutförmigen Erhebung vermieden. Weiterhin kann dieser Ring als Einspannung beim Fertigungsprozeß des Koppelkörpers dienen, sofern dieser beispielsweise aus Metall gedreht wird.In this way, on the one hand, the energy loss when the ultrasound is transferred into a surrounding housing is negligible, and on the other hand, the excitation energy is thereby coupled into the hat-shaped elevation with a particularly large proportion and is thus used for liquid atomization. Because the ring for the positive reception of the piezo body is provided on the side facing away from the elevation, an undesired accumulation of liquid at the base of the hat-shaped elevation is avoided. Furthermore, this ring can serve as a clamp in the manufacturing process of the coupling body, provided that it is rotated from metal, for example.

Damit wurde bereits gesagt, daß der Koppelkörper in vorteilhafter Weise aus Metall, vorzugsweise aus Titan oder einer Titanlegierung, besteht.It has already been said that the coupling body advantageously consists of metal, preferably titanium or a titanium alloy.

Für eine gleichmäßige Verteilung der zu zerstäubenden Flüssigkeit auf der Erhebung ist es vorteilhaft, wenn die hutförmige Erhebung im wesentlichen rotationssymmetrisch ist. Sie kann vorzugsweise im Schnitt parabel- oder ellipsenförmig, aber auch exponentiell ausgestaltet sein.For a uniform distribution of the liquid to be atomized on the elevation, it is advantageous if the hat-shaped elevation is essentially rotationally symmetrical. It can preferably be parabolic or elliptical in section, but also exponential.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Figur näher erläutert. Dabei zeigt diese Figur in schematischer Darstellung einen Längsschnitt durch einen Ultraschallzerstäuber.An embodiment of the invention is explained in more detail with reference to a figure. This figure shows a schematic representation of a longitudinal section through an ultrasonic atomizer.

Der Ultraschallzerstäuber 2 umfaßt eine Piezokeramikscheibe 4, einen Koppelkörper 6 und einen Membrankörper 8. Die Piezokeramikscheibe 4 ist mit im Ausführungsbeispiel nicht weiter dargestellten Elektroden versehen, die an einen nicht weiter dargestellten, die Piezokeramik anregenden elektrischen Schwingkreis angeschlossen sind. Die Piezokeramikscheibe 4 wird im Ausführungsbeispiel in Dickenresonanz betrieben, d. h. die Schallwellen werden im wesentlichen parallel zur Rotationssymmetrieachse 10 abgestrahlt.The ultrasonic atomizer 2 comprises a piezoceramic disk 4, a coupling body 6 and a membrane body 8. The piezoceramic disk 4 is provided with electrodes, not shown in the exemplary embodiment, which are not connected to one shown, the piezoceramic electrical resonant circuit are connected. In the exemplary embodiment, the piezoceramic disk 4 is operated in thickness resonance, ie the sound waves are emitted essentially parallel to the axis of rotational symmetry 10.

Der Koppelkörper 6 besteht aus einem einzigen metallischen Stück und ist aus Titan oder einer Titanlegierung hergestellt. Der Koppelkörper 6 weist drei verschiedene Abschnitte auf:
Den ersten Abschnitt stellt eine hutförmige, hier rotationssymmetrische parabelförmige Erhebung 12 dar, die im Ausführungsbeispiel eine Höhe von etwa 4 mm und einen Durchmesser von etwa 10 mm hat.The coupling body 6 consists of a single metallic piece and is made of titanium or a titanium alloy. The coupling body 6 has three different sections:
The first section is a hat-shaped, here rotationally symmetrical parabolic elevation 12, which in the exemplary embodiment has a height of approximately 4 mm and a diameter of approximately 10 mm.

Der zweite Abschnitt beginnt an der Basis 14 der parabelförmigen Erhebung 12 und dehnt sich als Scheibe 16 deutlich über den Rand der Erhebung 12 hinaus aus.The second section begins at the base 14 of the parabolic elevation 12 and extends as a disk 16 well beyond the edge of the elevation 12.

Den dritten Abschnitt repräsentiert ein Ring 18, der auf der von der Erhebung 12 abgewandten Seite der Scheibe 16 angeordnet ist. In diesen Ring 18 sind ein Membrankörper 8 und die Piezokeramikscheibe 4 eingeklebt. Der Membrankörper 8 besteht bevorzugt aus Kunststoff. Abweichend von der Figur kann auch auf die Verwendung des Membrankörpers verzichtet werden. Der Ultraschallzerstäuber benötigt dann keinen zusätzlichen Wirkstoff, wodurch sich seine Funktion unter Umständen noch verbessern kann.The third section represents a ring 18 which is arranged on the side of the disk 16 facing away from the elevation 12. A membrane body 8 and the piezoceramic disk 4 are glued into this ring 18. The membrane body 8 is preferably made of plastic. Deviating from the figure, the use of the membrane body can also be dispensed with. The ultrasonic atomizer then does not require any additional active ingredient, which may improve its function under certain circumstances.

Beim Betrieb des Ultraschallzerstäubers 2 wird eine (bei medizinischen Anwendungen meist relativ geringe) Menge an Flüssigkeit f über eine Zuführung 20 auf die höchste Stelle der Erhebung 12 geträufelt. In Abhängigkeit von der Viskosität der Flüssigkeit f und der Adhäsion der Flüssigkeit f an der metallischen Oberfläche des Koppelkörpers 6 im Bereich der Erhebung 12 verteilt sich die Flüssigkeit f mit einer relativ gleichmäßigen und etwa gleich dicken Flüssigkeitshöhe über die Oberfläche der Erhebung 12, d.h. es kommt zu einer Benetzung der Oberfläche mit der zu zerstäubenden Flüssigkeit f. Bei eingeschalteter Anregung der Piezokeramikscheibe 4 wird die gleichmäßig über die Oberfläche der Erhebung 12 verteilte Flüssigkeit f zerstäubt. Es ergibt sich dabei ein großer Anteil Tröpfchen mit einem Durchmesser kleiner 10 µm, wenn im Megahertzbereich angeregt wird. Aufgrund der nur geringen Flüssigkeitshöhe auf der Oberfläche der Erhebung 12 treten so gut wie keine Energieverluste durch die Reflexion der Ultraschallwellen an der Grenzfläche Flüssigkeit/Luft auf. Dies führt zu einer schnellen Bildung eines lungengängigen Aerosols. Dieses Aerosol kann beispielsweise von Asthmatikern in Form eines aerosolisierten Bronchospasmolytikums inhaliert werden. Weil der Koppelkörper 6 bevorzugt aus Titan oder einer Titanlegierung besteht, weisen der Koppelkörper 6 und die zu zerstäubende Flüssigkeit f nur einen geringen Schallwiderstandsunterschied auf, was sich günstig auf den Reflexionsfaktor des Schalldrucks auswirkt.During operation of the ultrasonic atomizer 2, a quantity of liquid f (usually relatively small in medical applications) is dripped onto the highest point of the elevation 12 via a feed 20. Depending on the viscosity of the liquid f and the adhesion of the liquid f to the metallic surface of the coupling body 6 in the region of the elevation 12, the liquid f is distributed relatively uniform and approximately equally thick liquid height over the surface of the elevation 12, ie there is wetting of the surface with the liquid to be atomized f. When the excitation of the piezoceramic disk 4 is switched on, the liquid f uniformly distributed over the surface of the elevation 12 is atomized. There is a large proportion of droplets with a diameter of less than 10 µm if excitation in the megahertz range. Due to the low liquid level on the surface of the elevation 12, there is virtually no energy loss due to the reflection of the ultrasound waves at the liquid / air interface. This leads to the rapid formation of a respiratory aerosol. This aerosol can be inhaled, for example, by asthmatics in the form of an aerosolized bronchospasmolytic. Because the coupling body 6 preferably consists of titanium or a titanium alloy, the coupling body 6 and the liquid f to be atomized have only a slight difference in sound resistance, which has a favorable effect on the reflection factor of the sound pressure.

Zur Form der Erhebung 12 sei angemerkt, daß sie nicht notwendigerweise rotationssymmetrisch sein muß. Die Erhebung 12 kann ebenso an der höchsten Stelle abgeflacht sein, ohne daß ein "Hohlspiegel" existiert, der als Sammelbecken für die zu zerstäubende Flüssigkeit wirkt.The shape of the elevation 12 should be noted that it does not necessarily have to be rotationally symmetrical. The elevation 12 can also be flattened at the highest point without a "concave mirror" which acts as a collecting basin for the liquid to be atomized.

Claims (10)

Ultraschallzerstäuber (2), der eine elektrische anregbare Piezokeramik (4) und einen mit der Piezokeramik (4) in Wirkverbindung stehenden Koppelkörper (6) aufweist, wobei die mit einer zu zerstäubenden Flüssigkeit (f) in Berührung kommende Oberfläche des Koppelkörpers (6) als hutförmige Erhebung (12) ausgebildet ist, und wobei die hutförmige Erhebung (12) und der Koppelkörper (6) aus einem metallischen Vollmaterial bestehen.Ultrasonic atomizer (2), which has an electrically excitable piezoceramic (4) and a coupling body (6) which is operatively connected to the piezoceramic (4), the surface of the coupling body (6) coming into contact with a liquid (f) to be atomized as hat-shaped elevation (12) is formed, and wherein the hat-shaped elevation (12) and the coupling body (6) consist of a solid metal material. Ultraschallzerstäuber (2) nach Anspruch 1,
dadurch gekennzeichnet, daß der Koppelkörper (6) an der Basis (14) der hutförmigen Erhebung (12) als über den Rand der Erhebung (12) hinausgehende Scheibe (16) ausgebildet ist, die auf der von der Erhebung (12) abgewandten Seite einen Ring (18) zur Aufnahme der Piezokeramik (4) aufweist.Ultrasonic atomizer (2) according to claim 1,
characterized in that the coupling body (6) on the base (14) of the hat-shaped elevation (12) is designed as a disc (16) which extends beyond the edge of the elevation (12) and which is on the side facing away from the elevation (12) Has ring (18) for receiving the piezoceramic (4). Ultraschallzerstäuber nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß der Koppelkörper (6) aus Titan oder einer Titanlegierung besteht.Ultrasonic atomizer according to claim 1 or 2,
characterized in that the coupling body (6) consists of titanium or a titanium alloy. Ultraschallzerstäuber nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die hutförmige Erhebung (12) im wesentlichen rotationssymmetrisch ist.Ultrasonic atomizer according to one of claims 1 to 3, characterized in that the hat-shaped elevation (12) is essentially rotationally symmetrical. Ultraschallzerstäuber nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die hutförmige Erhebung (12) im Schnitt ellipsenförmig ausgebildet ist.Ultrasonic atomizer according to one of claims 1 to 4, characterized in that the hat-shaped elevation (12) is elliptical in section. Ultraschallzerstäuber nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die hutförmige Erhebung (12) im Schnitt parabelförmig ausgebildet ist.Ultrasonic atomizer according to one of claims 1 to 4, characterized in that the hat-shaped elevation (12) is parabolic in section. Ultraschallzerstäuber nach einem der Ansprüch 1 bis 4, dadurch gekennzeichnet, daß die hutförmige Erhebung (12) im Schnitt nach einer Exponentialfunktion ausgebildet ist.Ultrasonic atomizer according to one of claims 1 to 4, characterized in that the hat-shaped elevation (12) is designed in section according to an exponential function. Ultraschallzerstäuber nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die hutförmige Erhebung (12) eine Höhe von etwa 4 mm und einen Durchmesser von etwa 10 mm besitzt.Ultrasonic atomizer according to one of claims 1 to 7, characterized in that the hat-shaped elevation (12) has a height of approximately 4 mm and a diameter of approximately 10 mm. Ultraschallzerstäuber nach einem der Ansprüche 1 bis 8, der eine Zuführung (20) für die Flüssigkeit (f) aufweist, die etwa am höchsten Punkt der hutförmigen Erhebung (6) endet.Ultrasonic atomizer according to one of claims 1 to 8, which has a feed (20) for the liquid (f), which ends approximately at the highest point of the hat-shaped elevation (6). Ultraschallzerstäuber nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Piezokeramik (4) von einem Membrankörper (8) eingefaßt ist.Ultrasonic atomizer according to one of claims 1 to 9, characterized in that the piezoceramic (4) is surrounded by a membrane body (8).
EP95110003A 1994-06-29 1995-06-27 Ultrasonic atomizer Expired - Lifetime EP0689879B1 (en)

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DE4422822 1994-06-29
DE4422822 1994-06-29

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EP0689879B1 EP0689879B1 (en) 2000-09-20

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US (1) US5716002A (en)
EP (1) EP0689879B1 (en)
JP (1) JPH0824739A (en)
AT (1) ATE196436T1 (en)
CA (1) CA2152747A1 (en)
DE (1) DE59508726D1 (en)
ES (1) ES2151009T3 (en)

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US5950619A (en) * 1995-03-14 1999-09-14 Siemens Aktiengesellschaft Ultrasonic atomizer device with removable precision dosating unit
US5970974A (en) * 1995-03-14 1999-10-26 Siemens Aktiengesellschaft Dosating unit for an ultrasonic atomizer device
EP1214986A1 (en) 2000-12-13 2002-06-19 Siemens Aktiengesellschaft Ultrasonic atomizer

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DE59508726D1 (en) 2000-10-26
US5716002A (en) 1998-02-10
EP0689879B1 (en) 2000-09-20
JPH0824739A (en) 1996-01-30
CA2152747A1 (en) 1995-12-30
ES2151009T3 (en) 2000-12-16
ATE196436T1 (en) 2000-10-15

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