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EP0245671B1 - Zentralverschraubter Ultraschallzerstäuber - Google Patents

Zentralverschraubter Ultraschallzerstäuber Download PDF

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Publication number
EP0245671B1
EP0245671B1 EP87105667A EP87105667A EP0245671B1 EP 0245671 B1 EP0245671 B1 EP 0245671B1 EP 87105667 A EP87105667 A EP 87105667A EP 87105667 A EP87105667 A EP 87105667A EP 0245671 B1 EP0245671 B1 EP 0245671B1
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EP
European Patent Office
Prior art keywords
passage
section
cylindrical
transducer assembly
atomizing
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.)
Expired - Lifetime
Application number
EP87105667A
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English (en)
French (fr)
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EP0245671A1 (de
Inventor
Harvey L. Berger
Alan Paul
William J. Broe
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.)
Sono Tek Corp
Original Assignee
Sono Tek Corp
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 Sono Tek Corp filed Critical Sono Tek Corp
Priority to AT87105667T priority Critical patent/ATE71201T1/de
Publication of EP0245671A1 publication Critical patent/EP0245671A1/de
Application granted granted Critical
Publication of EP0245671B1 publication Critical patent/EP0245671B1/de
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
    • 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
    • B05B17/063—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 having an internal channel for supplying the liquid or other fluent material
    • 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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/14—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with oscillating elements; with intermittent operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/34—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by ultrasonic means
    • F23D11/345—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by ultrasonic means with vibrating atomiser surfaces

Definitions

  • the present invention relates to piezoelectric ultrasonic atomizers, particularly of the type having an atomizing surface at a tip of a reduced diameter amplifying probe at one end of a transducer and a coaxial fluid delivery channel extending from the other end of the transducer to the atomizing surface.
  • Piezoelectric ultrasonic atomizers are finding increasing use in industrial applications where liquid materials must be delivered in the form of a very fine spray or mist.
  • the design and construction of such atomizers is described in U.S. Patent No. 4,337,896 of BERGER et al.
  • a typical arrangement is to sandwich a flat electrode between two disks or piezoelectric material, such as lead zirconate titanate, to form a driving element, and then to clamp the driving element between a cylindrical front amplifying horn and a cylindrical rear dummy section.
  • the amplifying horn is provided with a reduced diameter probe having an atomizing surface at its tip.
  • the amplification of vibrational amplitude obtained at the atomizing surface is approximately equal to the ratio between the respective cross-sectional areas of the cylindrical portion of the front horn and of the end of the probe.
  • the clamping flange design has drawbacks, however.
  • the front and rear horns should each be made as a single piece. It is wasteful to have to start with stock having an outer diameter equal to the flange diameter and then machine as much as two-thirds of it away. More importantly, the size of droplets formed by an ultrasonic atomizer varies inversely with the frequency of the unit. To obtain very small particles in the micron range, it is necessary to use very high frequencies, well over 100 kHz. To avoid significant transverse wave motion in the transducer, however, the transverse dimensions of the front and rear sections should be less than one-quarter wavelength.
  • Another object of the invention is to provide external sealing of the piezoelectric elements in an atomizer as characterized above without exially loading the transducer element.
  • an ultrasonic liquid atomizing transducer assembly comprising a driving element including a pair of annular piezoelectric disks and an annular electrode coaxially positioned therebetween; terminal means for feeding ultrasonic frequency electrical energy to said electrode; a cylindrical rear dummy section having a front end contacting one piezoelectric disk of the driving element and a rear end; a front section having a cylindrical portion, the cylindrical portion having a rear end contacting the other piezoelectric disk of the driving element and a front end, and an amplifying portion extending from the front end of the cylindrical portion, the amplifying portion comprising a probe having a tip that forms an atomizing surface, an axial passage being provided through the length of the transducer assembly from the rear end of the rear dummy section to the atomizing surface, and a portion of the passage adjacent the driving element in the front atomizing section being enlarged and internally threaded; a tubular central bolt formed as a hollow stud having an externally threaded portion engaging
  • the rear dummy section having a constant outside diameter from the front end to the rear end, and a portion of the passage in the rear dummy section also being enlarged and internally threaded; the externally threaded portion of the tubular bolt engaging the internally threaded portion of the rear dummy section as well as the internally threaded portion of the front section with sufficient torque to connect the front atomizing section and the rear dummy section under a tension that provides all of a predetermined total compressive preload on the driving element, the externally threaded portion extending from a front end portion of the bolt located in the front atomizing section and formed with a smooth cylindrical sealing surface; the means for sealing the piezoelectric disks comprising an annular sealing member disposed between said sealing surface and the axial passage to prevent liquid flowing in the passage from reaching the inner circumferential surfaces of the piezoelectric disks; and the means for sealing the piezoelectric disks from contact with the liquid being atomized comprising an enclosed shell surrounding the transducer assembly, the shell having
  • an embodiment of an ultrasonic atomizing transducer assembly 11 includes a transducer 12 having a driving element 13, a rear dummy section 14, and a front atomizing section 15.
  • the driving element 13 is assembled from a washer-shaped metal electrode 16 sandwiched between a pair of annular piezoelectric disks 17 and 18.
  • the electrode may be made of copper or any other suitable metal having high electrical conductivity, and it is provided with a terminal 19 for attachment to a source of electrical energy at the resonant frequency of the transducer.
  • the piezoelectric disks are made of any material conventionally used for such service, such as barium titanate or lead zirconate titanate.
  • the rear dummy section 14 is a metal cylinder, preferably titanium, having a length equal to a quarter wavelength at the designed operating frequency of the transducer.
  • a front end 20 of the rear section 14 contacts the rear piezoelectric disk 18, and a rear end 21 of the rear section is free to vibrate as an antinodal plane.
  • the front atomizing section 15 includes a cylindrical portion 22 having a rear end 23 that contacts the front piezoelectric disk 17 and a front end 24 that lies in a nodal plane, the cylindrical portion 22 being designed to be one-half wavelength long at the operating frequency of the transducer. From the front end of the cylindrical portion 22, a quarter wavelength amplifying probe 25 extends to a frustoconical tip 26 having an atomizing surface 27.
  • the front atomizing section preferably is made of the same material as the rear dummy section, although a different material could be used if desired, so long as the appropriate wavelength dimensions were used to match the operating frequency of the rear section.
  • the outer diameter of the transducer is equal to the diameters of the front and rear sections. These sections are clamped against the driving element 13 with a predetermined compressive stress by a central tubular bolt 29 that is formed as an enlarged threaded stud on the end of a liquid feed tube 30.
  • the tubular bolt engages an internally threaded enlarged portion 31 of an axial passage 32 that extends through the transducer from the rear end of the rear dummy secton 14 to open onto the atomizing surface at the tip of the probe 25.
  • an O-ring seal 33 is provided between a smooth sealing surface 34 machined on the front end of the central bolt 29 and the inner surface of the passage 32.
  • the O-ring is fitted into a circumferential groove machined into the wall of the passage to assure that the O-ring is properly located with respect to the sealing surface 34.
  • the groove could equally well be formed on the end of the bolt, or any other conventional sealing arrangement could be used between the end of the bolt and the inner surface of the passage in the front section.
  • An additional O-ring 35 is provided to seal between the outer circumference of the feed tube 30 and the inner circumference of the axial passage. This second O-ring prevents ingress of moisture from the environment surrounding the atomizer.
  • This shell is in the form of a cylindrical cup 37 having a screw cap 38.
  • the cup 37 has an end wall 39 provided with an opening 40 which receives the cylindrical portion 22 of the front section of the transducer. This opening is sealed by a radially compressed O-ring 41 disposed between the outer circumference of the cylindrical portion 22 and a counterbore 42 in the opening 40.
  • the screw cap 38 has an end wall 43 with a similar but smaller opening 44.
  • O-ring 45 in a counterbore 46 seals this opening in the same way as O-ring 41 seals the front opening. As illustrated, O-ring 45 is radially compressed between the counterbore 46 and a cylindrical collar 47 extending from the end 21 of the rear dummy section.
  • the dimensions of the collar and the counterbore could be revised so that the O-ring 45 could seal radially against the outer periphery of the feed tube 30 and abut against the end of the collar. It is important, however, that there be no axial compression force exerted by the shell against the transducer body via the O-rings 41 and 45.
  • the narrow flange 28 at the rear of the front section serves merely to locate the O-ring 41 as close as possible to the nodal plane defined by the electrode 16. There should be no axial force exerted against this flange by the O-ring since the O-ring 45 at the rear of the shell has room to float axially. Consequently, the transducer is supported in the shell substantially purely radially, with no axial force exerted between the shell and the transducer.
  • the procedure for assembling the transducer is as follows. After the O-ring 33 is installed into its groove in the front section 22, the central bolt is screwed into the front section until it bottoms. The piezoelectric disks and the center electrode are then passed over the bolt. If desired, a sleeve of electrical insulating material (not shown) may be inserted between the bolt and the inner circumferences of the disks and electrode. This will help to center the driving element as well as to prevent a short circuit of the driving element. It also may be desirable to add a second annular electrode (not shown) between the rear piezoelectric disk and the rear dummy section to provide a second terminal to facilitate completing the electrical circuit across the piezoelectric disks.
  • the O-ring 35 is fitted over the feed tube 30, and the rear dummy section is then screwed down against the driving element.
  • the proper compression force is obtained by applying a torque wrench to two diametrically spaced detent holes 48 drilled in the rear end 21 of the rear dummy section.
  • the shell can be mounted by first installing O-ring 45 on the collar 47 (or on the tube 30 in the above-mentioned alternative arrangement) and then sliding the threaded cap 38 over the tube 30 into place over the rear dummy section.
  • a lead wire 49 attached to a hermetically sealed coaxial fitting 50 mounted on the end wall of the cap is then clipped or soldered to terminal 19 of the center electrode 16.
  • a second electrode is provided, as described above, a second lead wire (not shown) from a second coaxial fitting (not shown) should be similarly attached to the second electrode.
  • the O-ring 41 is placed on the cylindrical portion 22 of the front atomizing section, and the cup 37 is slipped onto the cylindrical section 22 and screwed into the cap 38 until it bottoms.
  • the cap can be tightened by means of a spanner wrench fitting the detent holes 51 in the end wall of the cap.
  • the transducer Since the transducer is connected to the shell only radially through the "axially floating" O-rings 41 and 45, the transducer can be mounted by clamping or fastening to the shell in any desired way without adversely affecting either the compression preload on the driving element 13 or the resonant frequency of the transducer.
  • Liquid can be delivered to the rear of the unit via a flexible hose (not shown) connected to the delivery tube 30 by the standard coupling connectors 52 (see Fig. 1).
  • the assembly can be supported by a rigid liquid supply pipe coupled to the delivery tube 30.
  • an atomizing transducer was built and tested.
  • the dimensions were chosen for an operating frequency of about 56 kHz.
  • the front and rear transducer sections were made of titanium and the central bolt was made of 316 stainless steel, to provide corrosion resistance for a wide variety of operating liquids. Due to the relatively low yield strength of this material, however, it is a marginal choice particularly for higher frequencies, because the bolt may have to be torqued beyond its yield point to obtain the required compression on the piezoelectric disks. Thus, in applications where corrosion resistance is not a prime consideration, it may be preferable to use a stronger steel for the central bolt material.
  • the design of the present invention is adapted to provide an ultrasonic atomizing transducer that is simple to manufacture and is completely shielded from damp or hazardous environments, such as explosive atmospheres.
  • the central bolt could be integrally formed as part of the rear or front section in applications where the material of the section is strong enough to carry the necessary tensile stress for preloading the piezoelectric disks.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Special Spraying Apparatus (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Catching Or Destruction (AREA)
  • Nozzles (AREA)

Claims (8)

  1. Wandlereinrichtung für einen Flüssigkeitsultraschallzerstäuber mit:

    einem Antriebselement (13) mit einem Paar von ringförmigen piezoelektrischen Scheiben (17, 18) und einer ringförmigen Elektrode, die koaxial dazwischen angeordnet ist;

    einem Anschlusselement (19) zur Einleitung ultraschall-frequenter elektrischer Energie in die Elektrode;

    einem zylindrischen hinteren Ansatzstück (14), welches ein vorderes Ende (20), das mit der einen piezoelektrischen Scheibe (18) des Antriebselements (13) in Verbindung steht, und ein hinteres Ende (21) aufweist;

    einem vorderen Bereich (19) mit einem zylindrischen Abschnitt (22), wobei der zylindrische Abschnitt ein hinteres Ende (23), das mit der anderen piezoelektrischen Scheibe (17) des Antriebselements in Verbindung steht, und ein vorderes Ende (24) aufweist, und einem sich verstärkenden Bereich, der vom vorderen Ende des zylindrischen Bereichs absteht, wobei der sich verstärkende Bereich eine Sonde (25) aufweist, mit einer Spitze (26), welche eine Zerstäubungsoberfläche (27) bildet, einem axialen Durchlass (32), welcher sich über die Länge der Wandlereinrichtung (11) von deren hinterem Ende (21) des hinteren Ansatzstückes bis zur Zerstäubungsoberfläche (27) erstreckt, und mit einem Bereich (31) des Durchlasses, welcher dem vorderen Zerstäubungsabschnitt des Antriebselements (13) benachbart und aufgeweitet ist, und ein Innengewinde aufweist;

    einem rohrförmigen Zentralbolzen (29), der als hohle Stiftschraube ausgebildet ist und einen äusseren mit einem Gewinde versehenen Bereich aufweist, der mit dem Innengewinde des Durchlasses im vorderen Zerstäubungsabschnitt in Verbindung steht, wobei ein hinterer Speiseleitungsabschnitt des Bolzens im hinteren Ansatzstück vorgesehen ist und sich axial über das hintere Ende des Ansatzstückes hinauserstreckt;

    Mittel (33) zum Abdichten der piezoelektrischen Scheiben (17, 18) gegenüber der zu zerstäubenden Flüssigkeit,

    dadurch gekennzeichnet,

    dass das hintere Ansatzstück (14) vom vorderen Ende bis zum hinteren Ende einen konstanten Aussendurchmesser aufweist und ein Abschnitt des im hinteren Ansatzstück sich befindenden Durchlasses aufgeweitet ist und ein Innengewinde aufweist;

    dass der äussere, mit einem Gewinde versehene Abschnitt des rohrförmigen Bolzens (29) sowohl mit dem mit einem Innengewinde versehenen Abschnitt des hinteren Ansatzstückes als auch mit dem mit einem Innengewinde versehenen Abschnitt des vorderen Bereichs mit ausreichender Drehkraft in Verbindung steht, um den vorderen Zerstäubungsbereich und das hintere Ansatzstück mit ausreichender Spannkraft zu verbinden, wobei die Spannkraft vollständig die ganze vorbestimmte Druckvorspannung auf das Antriebselement zur Verfügung stellt, und dass der mit einem Aussengewinde versehene Abschnitt, welcher von einem vorderen Endabschnitt des Bolzens absteht, im vorderen Zerstäubungsabschnitt angeordnet ist und mit einer glatten zylindrischen Dichtfläche (34) versehen ist;

    dass die Mittel zum Abdichten der piezoelektrischen Scheiben ein ringförmiges Dichtelement (33) aufweisen, welches zwischen der Dichtfläche (34) und dem axialen Durchlass (32) angeordnet ist und verhindert, dass im Durchlass strömende Flüssigkeit die innere Umfangsfläche der piezoelektrischen Scheiben (17, 18) erreicht; und

    dass die Mittel zum Abdichten der piezoelektrischen Scheiben gegenüber einer Kontaktierung mit der zu zerstäubenden Flüssigkeit ein Gehäuse (36) aufweisen, welches die Wandlereinrichtung (11) umgibt und mit einer vorderen Stirnwand (39) versehen ist, die mit einem zylindrischen Durchlass (40) versehen ist, der lose den zylindrischen Abschnitt (22) des vorderen Bereichs (15) und ein Dichtelement (41) aufnimmt, welches zwischen der Innenoberfläche des zylindrischen Durchlasses und der Umfangsfläche des zylindrischen Abschnitts des vorderen Bereichs angeordnet ist, und dass dar radiale Abstand zwischen dem zylindrischen Abschnitt des vorderen Bereichs und dem zylindrischen Durchlass kleiner ist als die radiale Dicke des ringförmigen, unverformten Dichtelements, so dass das ringförmige Dichtelement (41) zwischen dem Durchlass und dem zylindrischen Abschnitt radial komprimiert wird und in axialer Richtung frei ist.
  2. Wandlereinrichtung für einen Flüssigkeitsultraschallzerstäuber nach Anspruch 1, dadurch gekennzeichnet, dass das ringförmige Dichtelement (33) einen O-Ring aufweist.
  3. Wandlereinrichtung für einen Flüssigkeitsultraschallzerstäuber nach Anspruch 1, dadurch gekennzeichnet, dass die mit einem Gewinde versehene Stiftschraube ein hinteres, im hinteren Ansatzstück (14) sich befindendes Ende aufweist und der rohrförmige Zentralbolzen (29) zudem eine integrale Flüssigkeitsspeiseleitung (30) aufweist, die eine glatte Aussenoberfläche besitzt und axial vom hinteren Ende der mit einem Gewinde versehenen Stiftschraube über das hintere Ende des Ansatzstückes hinweg absteht.
  4. Wandlereinrichtung für einen Flüssigkeitsultraschallzerstäuber nach Anspruch 3, dadurch gekennzeichnet, dass die Mittel zum Abdichten der piezoelektrischen Scheiben (17, 18) ein zusätzliches ringförmiges Dichtelement (35) aufweisen, welches zwischen der glatten Aussenoberfläche dar Flüssigkeitsspeiseleitung (30) und dem axialen Durchlass (32) angeordnet ist, um die die Wandlereinrichtung umgebende Feuchtigkeit davon abzuhalten, an die innere Umfangsfläche der piezoelektrischen Scheiben zu gelangen.
  5. Wandlereinrichtung für einen Flüssigkeitsultraschallzerstäuber nach Anspruch 4, dadurch gekennzeichnet, dass das zusätzliche ringförmige Dichtungselement (35) einen O-Ring aufweist.
  6. Wandlereinrichtung für einen Flüssigkeitsultraschallzerstäuber nach Anspruch 1, dadurch gekennzeichnet, dass die Mittel zum Abdichten der piezoelektrischen Scheiben (17, 18) gegenüber einer Kontaktierung mit der zu zerstäubenden Flüssigkeit ausserdem aufweisen:

    dass das Gehäuse (36) ferner eine hintere Wand besitzt, welche mit einem zusätzlichen zylindrischen Durchlass versehen ist, der lose eine axiale, vom hinteren Ende des hinteren Ansatzstückes aus sich erstreckende Flüssigkeitsspeiseleitung und ein zusätzliches ringförmiges Dichtelement (45) aufnimmmt, welches zwischen dem zusätzlichen zylindrischen Durchlass und der Speiseleitung (30) angeordnet ist, dass der radiale Abstand zwischen dem zusätzlichen zylindrischen Durchlass und der Speiseleitung (30) kleiner ist als die radiale Dicke des ringförmigen unverformten Dichtelements, so dass das ringförmige Dichtelement zwischen dem zusätzlichen Durchlass und der Speiseleitung radial komprimiert wird und in axialer Richtung frei ist.
  7. Wandlereinrichtung für einen Flüssigkeitsultraschallzerstäuber nach Anspruch 6, dadurch gekennzeichnet, dass das zuerst erwähnte und das zusätzliche, radial komprimierte Dichtelement (45) O-Ringe aufweisen.
  8. Wandlereinrichtung für einen Flüssigkeitsultraschallzerstäuber nach Anspruch 6, dadurch gekennzeichnet, dass das geschlossene Gehäuse (36) eine zylindrische Büchse (37) und eine zylindrische Kappe (38) aufweist, die über ein Gewinde auf die Büchse aufgesetzt ist.
EP87105667A 1986-05-09 1987-04-16 Zentralverschraubter Ultraschallzerstäuber Expired - Lifetime EP0245671B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87105667T ATE71201T1 (de) 1986-05-09 1987-04-16 Zentralverschraubter ultraschallzerstaeuber.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US86151286A 1986-05-09 1986-05-09
US861512 1986-05-09

Publications (2)

Publication Number Publication Date
EP0245671A1 EP0245671A1 (de) 1987-11-19
EP0245671B1 true EP0245671B1 (de) 1992-01-02

Family

ID=25336011

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105667A Expired - Lifetime EP0245671B1 (de) 1986-05-09 1987-04-16 Zentralverschraubter Ultraschallzerstäuber

Country Status (6)

Country Link
EP (1) EP0245671B1 (de)
JP (1) JPS62273068A (de)
KR (1) KR900003217B1 (de)
AT (1) ATE71201T1 (de)
CA (1) CA1249861A (de)
DE (1) DE3775612D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114100943B (zh) * 2021-12-30 2022-12-02 北京科技大学 一种用于形成雾锥的超声雾化喷嘴

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368085A (en) * 1965-11-19 1968-02-06 Trustees Of The Ohio State Uni Sonic transducer
US3396285A (en) * 1966-08-10 1968-08-06 Trustees Of The Ohio State Uni Electromechanical transducer
US3694675A (en) * 1971-02-25 1972-09-26 Eastman Kodak Co Cooled ultrasonic transducer
US3689783A (en) * 1971-03-11 1972-09-05 David A Williams Ultrasonic transducer with half-wave separator between piezoelectric crystal means
US3861852A (en) * 1974-01-25 1975-01-21 Berger Harvey Fuel burner with improved ultrasonic atomizer
US4153201A (en) * 1976-11-08 1979-05-08 Sono-Tek Corporation Transducer assembly, ultrasonic atomizer and fuel burner
IL60236A (en) * 1979-06-08 1985-07-31 Sono Tek Corp Ultrasonic fuel atomizer
FR2465528A1 (fr) * 1979-09-26 1981-03-27 Hotchkiss Brandt Sogeme Dispositif vibratoire a element piezo-electrique pour canon a liquide destine a une tete d'ejection d'un liquide fragmente
US4352459A (en) * 1979-11-13 1982-10-05 Sono-Tek Corporation Ultrasonic liquid atomizer having an axially-extending liquid feed passage
DE3244405A1 (de) * 1982-12-01 1984-06-07 Fa. J. Eberspächer, 7300 Esslingen Einrichtung zur gemischaufbereitung bei motorunabhaengigen heizgeraeten

Also Published As

Publication number Publication date
KR870010906A (ko) 1987-12-18
CA1249861A (en) 1989-02-07
ATE71201T1 (de) 1992-01-15
EP0245671A1 (de) 1987-11-19
JPH0411268B2 (de) 1992-02-27
DE3775612D1 (de) 1992-02-13
JPS62273068A (ja) 1987-11-27
KR900003217B1 (ko) 1990-05-11

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