EP0300319A2 - Dispositif résonant à commande piézoélectrique pour atomiser un fluide par ultrasons - Google Patents

Dispositif résonant à commande piézoélectrique pour atomiser un fluide par ultrasons Download PDF

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Publication number
EP0300319A2
EP0300319A2 EP88111066A EP88111066A EP0300319A2 EP 0300319 A2 EP0300319 A2 EP 0300319A2 EP 88111066 A EP88111066 A EP 88111066A EP 88111066 A EP88111066 A EP 88111066A EP 0300319 A2 EP0300319 A2 EP 0300319A2
Authority
EP
European Patent Office
Prior art keywords
worktop
resonance system
base plate
plate
neck
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
EP88111066A
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German (de)
English (en)
Other versions
EP0300319A3 (en
EP0300319B1 (fr
Inventor
Johannes Dr. Däges
Klaus Dipl.-Ing. Van Der Linden
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.)
Siemens AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP0300319A2 publication Critical patent/EP0300319A2/fr
Publication of EP0300319A3 publication Critical patent/EP0300319A3/de
Application granted granted Critical
Publication of EP0300319B1 publication Critical patent/EP0300319B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B05B17/0623—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 coupled with a vibrating horn
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B3/04—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency involving focusing or reflecting

Definitions

  • the invention is in the field of devices for generating resonant vibrations in the ultrasonic frequency range. It can be used in the structural design of a piezoelectrically excitable, resonant system with which liquids are atomized.
  • a known device for liquid atomization consists of a rotationally symmetrical metal body with a piezoceramic vibrator coupled to the base of the metal body.
  • the metal body of this (executing a bending vibration) resonance system has three areas, namely a disk-shaped base plate, a vibrating plate referred to as a “work plate” and a web connecting the base plate and the work plate and lying in the axis of symmetry of the metal body.
  • the worktop is used to hold a liquid. Aerosols that can be generated with such a resonance system have droplet diameters that are largely non-respiratory. Such a resonance system is therefore not very suitable for the production of aerosols for inhalation purposes.
  • the invention is based on a resonance system with the features of the preamble of claim 1. It is based on the object of improving the resonance system in such a way that, with the smallest possible electrical excitation power, a droplet diameter of the aerosol of less than 15 micrometers can be achieved in order to further increase the aerosol's ability to move into the lungs.
  • the piezoceramic ultrasonic vibrator is a vibrator working in thickness resonance
  • the base plate of the metal body has a parabolic cover surface opposite the base surface
  • the worktop is plate-shaped or bowl-shaped
  • the center of the Worktop is located in or near the actual focal point of the parabolic cover surface or the focal point of the parabolic cover surface reflected through the neck on the base surface of the base plate.
  • the term “parabolic top surface” is understood to mean a surface that reflects the ultrasound waves that strike into a focal point. Approximately, this can also be a spherical surface or a surface adapted to a paraboloid from annular partial surfaces (truncated cone surfaces with different cone opening angles).
  • the ultrasonic waves fed into the metal body by the piezoceramic thickness transducer are on the parabolic top surface reflected from the base plate and focused through the neck into the area of the worktop. Since the ultrasonic waves hit the worktop at an angle of inclination, some of these sound waves are reflected in the direction of the edge of the worktop; another part runs as a surface wave in the direction of the edge. This ensures an even distribution of the liquid to be atomized on the worktop and thus uniform atomization over the entire atomization period. In addition, the liquid surface is close to the optimal atomization point during the entire atomization process.
  • aerosols are generated in which more than 50% of the atomizable volume is in droplets with a diameter of less than or equal to 15 ⁇ m and the most common droplet diameter is less than or equal to 5 ⁇ m.
  • compliance with a specific resonance frequency is ensured in such a resonance system within the framework of manageable manufacturing tolerances.
  • the metal body of the resonance system can be designed such that the base of the base plate is a circular ring, and that the base plate merges into a conical neck which penetrates the central opening of the circular ring beyond the base plate. This results in a relatively compact design of the resonance system.
  • the piezoceramic thickness transducer also has the shape of a circular ring in this case.
  • the worktop can be integrated directly into the neck, in that the neck is designed as a truncated cone with a plate-shaped or bowl-shaped depression at the tapering end.
  • the focal point of the ultrasonic waves can be placed in the hollow of the cone tip and thus directly in the liquid to be atomized.
  • the metal body can also be designed such that the conical neck at the tapered end merges into the plate or bowl-shaped worktop in the form of an extension. This enables the atomization of a larger amount of liquid.
  • a particularly advantageous embodiment of the metal body is that the disk-shaped base plate on the side of the parabolic cover surface near the axis of symmetry merges into the neck carrying the worktop.
  • the ultrasonic waves are reflected twice before they hit the worktop. Interference effects associated with this double reflection, bundle dislocations (DE-Z "Material Institute", 1965, page 281 ff.) And reentry of the ultrasound waves into the piezoceramic lead to parallel beam displacements, which improves the feeding of the ultrasound into the liquid to be atomized. This can be further taken into account by a special design of the worktop.
  • This configuration consists in the fact that the side part of the worktop forms a conical jacket, and that the transition area between the neck and the plate-shaped worktop and the inclination of the side part relative to the central part of the worktop is selected such that ultrasonic waves reflected on the worktop are directed into the side part and be reflected several times in the direction of the plate.
  • the dimensioning of the resonance system depends on the speed of sound in the metal body, which is preferably made of chromium-nickel steel, and on the desired frequency.
  • the frequency should be in the favorable transmission range of the piezoceramic thickness transducer. Since the continuous atomization of a liquid is preferably carried out using standing ultrasound waves, the ultrasound path in the metal body should be a multiple of half the wavelength, in particular 6-28 times.
  • the thickness of the disk-shaped base plate approximately twice as large as the ultrasonic wavelength and to dimension the diameter of the plate-shaped worktop with approximately three times this wavelength.
  • the diameter of the base surface of the disk-shaped base plate should be approximately ten times this wavelength.
  • the one-piece metal body 1 shown is - geometrically speaking - a ring part which is penetrated by a cone with a parabolically shaped underside 4, the ring part and the cone having the same axis of symmetry 10 and the same outside diameter.
  • the metal body 1 thus has a disk-shaped base plate 2 with a flat, annular base surface 3 running perpendicular to the axis of symmetry or rotation 10 and with an opposite symmetrical parabolic cover surface 4; it also has a conically tapering neck 5, which penetrates the annular base surface 3, that is, protrudes therefrom, and which is formed at the tapered end with a plate-shaped or bowl-shaped recess 6.
  • the recess 6 in the neck 5 also forms the worktop of the resonance system. It is intended to hold a liquid to be atomized.
  • the center of the depression 6 is located in or near the actual focal point F1 of the base area 4.
  • the ultrasound oscillator 7 which in the present case is ring-shaped, is coupled to the flat base area 3, which runs perpendicular to the axis of symmetry 10. It lies symmetrically to the axis of symmetry 10. It operates in what is known as a thickness resonance.
  • the resonance system is constructed on the basis of the exemplary embodiment according to FIG. 1.
  • a one-piece, rotationally symmetrical metal body 11 is provided, which consists of a disk-shaped base plate 12 with a flat, ring-shaped base surface 13, an opposite parabolic cover surface 14 and a conically tapering neck 15.
  • the neck 15 also protrudes from the base 13 here.
  • a plate-shaped overhanging part 16 is provided, which is molded onto the tapered end of the neck 15.
  • the plate-shaped worktop 16 has the shape of an extension and has a flat central part and a tapered side part (conical plate wall).
  • the resonance system is excited via an electrically loadable piezoceramic ring body 17, which is coupled to the metal body 11 (preferably made of chromium-nickel steel) on the base surface 13, e.g. is glued.
  • the common axis of symmetry is designated 20.
  • An ultrasound wave US excited by the piezoceramic ring body 17, which also works here as a thickness oscillator, is reflected on the parabolic cover surface 14 and focused in the vicinity of the center of the plate-shaped worktop 16 at the focal point F2.
  • the liquid on the worktop 16 is atomized as a result.
  • an oscillatable, rotationally symmetrical metal body 21 has a disk-shaped base plate 22, the base surface 23 of which is designed as a flat circular surface. Opposite it is a parabolic cover surface 24.
  • the base plate 22 merges on the side of its parabolic cover surface 24 in the region of the axis of symmetry 30 via a neck 25 into a plate-shaped worktop 26.
  • This plate 26 has a flat central part 28 and a tapered side part 29 (conical plate wall).
  • the entire resonance system is rotationally symmetrical with respect to the axis of symmetry 30.
  • a piezoceramic thickness transducer 27 is here cylindrical (with a circular coupling surface) and glued to the flat base surface 23 and thereby coupled.
  • An ultrasonic wave US1 excited by the thickness transducer 27 is reflected both at the parabolic cover surface 24 and at the interface 23 between the thickness transducer 27 and the base plate 22 and is focused towards the center of the plate-shaped work plate 26.
  • the focal point F3 of the ultrasonic waves US1 is a mirror image of the focal point of the parabolic surface 24, the base surface 23 forming the mirror surface.
  • the focussing point F3 of the ultrasound wave US1 and the atomization location lie here on the same side of the base area 23.
  • the transition area between the neck 25 and the plate-shaped worktop 26 and the inclination of the side part 29 against the central part 28 are chosen accordingly.
  • a circumferential, ring-shaped notch 33 - preferably on the underside of the plate wall 29 as shown on the left - in the vicinity of the plate edge shields the plate edge from the ultrasonic waves. As a result, it calms down the liquid on the worktop 26 in the edge region.
  • the diameter of the plate-shaped worktop 26 is approximately three times the ultrasonic wavelength in the metal body 21, the diameter of the neck 25 and the plate middle part is approximately one Wavelength, a height of Neck 25 of likewise approximately one wavelength, a thickness of the base plate 22 of twice the wavelength and a diameter of the base surface 23 of approximately ten times the wavelength have proven to be expedient.
  • the thickness of the piezoceramic thickness transducer 27 preferably corresponds to approximately half the wavelength of the excited ultrasound wave in the thickness transducer 27.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Special Spraying Apparatus (AREA)
EP88111066A 1987-07-22 1988-07-11 Dispositif résonant à commande piézoélectrique pour atomiser un fluide par ultrasons Expired - Lifetime EP0300319B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873724629 DE3724629A1 (de) 1987-07-22 1987-07-22 Piezoelektrisch anregbares resonanzsystem
DE3724629 1987-07-22

Publications (3)

Publication Number Publication Date
EP0300319A2 true EP0300319A2 (fr) 1989-01-25
EP0300319A3 EP0300319A3 (en) 1990-05-09
EP0300319B1 EP0300319B1 (fr) 1995-11-02

Family

ID=6332325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111066A Expired - Lifetime EP0300319B1 (fr) 1987-07-22 1988-07-11 Dispositif résonant à commande piézoélectrique pour atomiser un fluide par ultrasons

Country Status (6)

Country Link
US (1) US4888516A (fr)
EP (1) EP0300319B1 (fr)
JP (1) JP2543493B2 (fr)
AT (1) ATE129651T1 (fr)
CA (1) CA1307555C (fr)
DE (2) DE3724629A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007093153A1 (fr) * 2006-02-17 2007-08-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Actionneur à ultrasons destiné au nettoyage d'objets
WO2007104859A1 (fr) * 2006-03-15 2007-09-20 L V M H Recherche Dispositif de pulverisation a element piezoelectrique, et son utilisation en cosmetologie et en parfumerie

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US5938117A (en) * 1991-04-24 1999-08-17 Aerogen, Inc. Methods and apparatus for dispensing liquids as an atomized spray
US6629646B1 (en) 1991-04-24 2003-10-07 Aerogen, Inc. Droplet ejector with oscillating tapered aperture
US5449502A (en) * 1992-12-30 1995-09-12 Sanden Corp. Sterilizing apparatus utilizing ultrasonic vibration
JPH0824739A (ja) * 1994-06-29 1996-01-30 Siemens Ag 超音波噴霧器
IL117473A (en) * 1995-03-14 2001-08-26 Siemens Ag Ultrasonic atomizer device with removable precision dosating unit
IL117474A (en) * 1995-03-14 2001-04-30 Siemens Ag Removable precise dosing unit containing inhaled drugs for a hearing aid device
US5758637A (en) 1995-08-31 1998-06-02 Aerogen, Inc. Liquid dispensing apparatus and methods
US6014970A (en) * 1998-06-11 2000-01-18 Aerogen, Inc. Methods and apparatus for storing chemical compounds in a portable inhaler
US6205999B1 (en) 1995-04-05 2001-03-27 Aerogen, Inc. Methods and apparatus for storing chemical compounds in a portable inhaler
US6085740A (en) 1996-02-21 2000-07-11 Aerogen, Inc. Liquid dispensing apparatus and methods
US6782886B2 (en) 1995-04-05 2004-08-31 Aerogen, Inc. Metering pumps for an aerosolizer
DE19533370C2 (de) * 1995-09-09 1999-10-28 Wilk Bernd Ulrich Verfahren und Anlage zur biologischen Mineralisierung von Schlamm in stehenden und fließenden Gewässern
CA2321745A1 (fr) 1998-03-03 1999-09-10 Sensotech Ltd. Transducteur ultrasonore
DE19924098A1 (de) * 1999-05-26 2000-12-07 Boehringer Ingelheim Pharma Edelstahlkanister für treibgasbetriebene Dosieraerosole
US6739333B1 (en) * 1999-05-26 2004-05-25 Boehringer Ingelheim Pharma Kg Stainless steel canister for propellant-driven metering aerosols
US6235177B1 (en) 1999-09-09 2001-05-22 Aerogen, Inc. Method for the construction of an aperture plate for dispensing liquid droplets
US7100600B2 (en) 2001-03-20 2006-09-05 Aerogen, Inc. Fluid filled ampoules and methods for their use in aerosolizers
US8336545B2 (en) 2000-05-05 2012-12-25 Novartis Pharma Ag Methods and systems for operating an aerosol generator
US6948491B2 (en) 2001-03-20 2005-09-27 Aerogen, Inc. Convertible fluid feed system with comformable reservoir and methods
US7971588B2 (en) 2000-05-05 2011-07-05 Novartis Ag Methods and systems for operating an aerosol generator
US6543443B1 (en) 2000-07-12 2003-04-08 Aerogen, Inc. Methods and devices for nebulizing fluids
US6546927B2 (en) 2001-03-13 2003-04-15 Aerogen, Inc. Methods and apparatus for controlling piezoelectric vibration
US6550472B2 (en) 2001-03-16 2003-04-22 Aerogen, Inc. Devices and methods for nebulizing fluids using flow directors
US6732944B2 (en) 2001-05-02 2004-05-11 Aerogen, Inc. Base isolated nebulizing device and methods
US6554201B2 (en) 2001-05-02 2003-04-29 Aerogen, Inc. Insert molded aerosol generator and methods
US7360536B2 (en) 2002-01-07 2008-04-22 Aerogen, Inc. Devices and methods for nebulizing fluids for inhalation
US7677467B2 (en) 2002-01-07 2010-03-16 Novartis Pharma Ag Methods and devices for aerosolizing medicament
JP4761709B2 (ja) 2002-01-15 2011-08-31 エアロジェン，インコーポレイテッド エアロゾル発生器を作動するための方法およびシステム
WO2003097126A2 (fr) 2002-05-20 2003-11-27 Aerogen, Inc. Appareil de realisation d'aerosol pour traitement medical et procedes correspondants
US8616195B2 (en) 2003-07-18 2013-12-31 Novartis Ag Nebuliser for the production of aerosolized medication
US7946291B2 (en) 2004-04-20 2011-05-24 Novartis Ag Ventilation systems and methods employing aerosol generators
KR101314052B1 (ko) * 2005-05-25 2013-10-02 노바르티스 아게 진동 시스템 및 방법
JP2008006644A (ja) * 2006-06-28 2008-01-17 Fujifilm Corp ミスト吐出ヘッド及びこれを備えた画像形成装置、液体吐出装置
WO2009155245A1 (fr) 2008-06-17 2009-12-23 Davicon Corporation Appareil de distribution de liquide utilisant un procédé passif de dosage de liquide
RU2577582C1 (ru) * 2014-10-20 2016-03-20 Федеральное государственное бюджетное учреждение науки Институт механики Уральского отделения Российской академии наук Пластинчатый распылитель жидкости
CN111841205A (zh) * 2020-06-24 2020-10-30 重庆工程职业技术学院 一种具有节水特性的离心射流雾化与超声雾化结合的方法

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EP0246515A1 (fr) * 1986-05-20 1987-11-25 Siemens Aktiengesellschaft Vibrateur ultrasonore à MHz, notamment pour atomiser des fluides

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DE1425897A1 (de) * 1964-10-20 1969-02-06 Lierke Dipl Phys Ernst Guenter Vorrichtung zum Vernebeln von Fluessigkeiten mit Ultraschall
FR1545920A (fr) * 1967-10-06 1968-11-15 Siderurgie Fse Inst Rech Dispositif de sondage ultrasonore
EP0246515A1 (fr) * 1986-05-20 1987-11-25 Siemens Aktiengesellschaft Vibrateur ultrasonore à MHz, notamment pour atomiser des fluides

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007093153A1 (fr) * 2006-02-17 2007-08-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Actionneur à ultrasons destiné au nettoyage d'objets
WO2007104859A1 (fr) * 2006-03-15 2007-09-20 L V M H Recherche Dispositif de pulverisation a element piezoelectrique, et son utilisation en cosmetologie et en parfumerie
US8061629B2 (en) 2006-03-15 2011-11-22 Lvmh Recherche Spray device having a piezoelectric element, and use thereof in cosmetology and perfumery

Also Published As

Publication number Publication date
EP0300319A3 (en) 1990-05-09
DE3854634D1 (de) 1995-12-07
ATE129651T1 (de) 1995-11-15
JP2543493B2 (ja) 1996-10-16
CA1307555C (fr) 1992-09-15
US4888516A (en) 1989-12-19
JPS6451162A (en) 1989-02-27
EP0300319B1 (fr) 1995-11-02
DE3724629A1 (de) 1989-02-02

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