EP0282616B1 - Ultrasonic liquid sprayer - Google Patents

Ultrasonic liquid sprayer Download PDF

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Publication number
EP0282616B1
EP0282616B1 EP87103907A EP87103907A EP0282616B1 EP 0282616 B1 EP0282616 B1 EP 0282616B1 EP 87103907 A EP87103907 A EP 87103907A EP 87103907 A EP87103907 A EP 87103907A EP 0282616 B1 EP0282616 B1 EP 0282616B1
Authority
EP
European Patent Office
Prior art keywords
cap
housing
cap part
diaphragm
ultrasonic liquid
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
Application number
EP87103907A
Other languages
German (de)
French (fr)
Other versions
EP0282616A1 (en
Inventor
Lothar Bendig
Frieder Hofmann
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.)
Lechler GmbH and Co KG
Original Assignee
Lechler GmbH and Co KG
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 Lechler GmbH and Co KG filed Critical Lechler GmbH and Co KG
Priority to EP87103907A priority Critical patent/EP0282616B1/en
Priority to DE8787103907T priority patent/DE3760650D1/en
Priority to AT87103907T priority patent/ATE46836T1/en
Priority to JP63009751A priority patent/JPS63252569A/en
Priority to BR8800272A priority patent/BR8800272A/en
Priority to US07/167,136 priority patent/US4796807A/en
Publication of EP0282616A1 publication Critical patent/EP0282616A1/en
Application granted granted Critical
Publication of EP0282616B1 publication Critical patent/EP0282616B1/en
Expired legal-status Critical Current

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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
    • B05B17/0623—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

Definitions

  • the invention relates to an ultrasonic liquid atomizer according to the preamble of claim I.
  • An ultrasonic liquid atomizer which has a part of the aforementioned features, has become known from DE-PS 32 33 901.
  • BE-A 902.301 shows a partial further development of this known ultrasonic liquid atomizer. It consists of a sieve-like membrane resting on the atomizing plate, which causes the droplets atomized from the atomizing plate to be guided in a targeted jet over a certain distance.
  • the jet-shaped misting means a decisive advantage in the endeavor to bring the droplets as far as possible to those places on the object to be sprayed where they are desired to hit.
  • the known device according to BE-A 902.301 consists of a fixed attachment piece which carries the sieve-shaped membrane and which is fastened to the housing of the ultrasound liquid atomizer via a rigid connection. Due to the inevitable tolerances of all components, this does not guarantee that the membrane always rests on the atomizing plate with a defined pre-tension. Any pre-tensioning force that is too strong has the disadvantageous effect that the atomizing plate is braked and therefore can no longer oscillate. A too low pre-tension or even an air gap between the membrane and the atomizer plate would mean the disadvantage that the desired effect of the membrane, namely to distribute the liquid film evenly on the atomizer plate, no longer comes into play and the drops atomized by the atomizer plate would rather be in the membrane get stuck.
  • FIG. 1 An exemplary embodiment shown in the drawing, which is described below, serves to illustrate the invention.
  • the drawing shows in detail - partly in side view, partly in vertical longitudinal section - an embodiment of an ultrasonic liquid atomizer.
  • the piezoelectric transducer part 10 consists of two ceramic disks II, 12. Between the two ceramic disks 11, 12 of the piezoelectric transducer part 10 is an electrode designated 13, which contains an electrical connection (not shown in the drawing) to the outside.
  • the piezoelectric disks II, 12 sit concentrically on a pin part 14, which has a thread 15. To the other side (on the right in the drawing), the pin part 14 widens like a shoulder to a transducer element 16, which serves as a right-sided axial stop for the three piezoelectric disks II, 12, 13. On the left side, the piezoelectric disks II, 12, 13 are axially fixed by a nut 17, which is screwed onto the thread 15.
  • the transducer element 16 has a lateral connection bore 18 into which a line 19 serving for the supply of liquid opens.
  • the liquid supplied through the line 19 enters an axial bore (not shown) which extends within an amplitude transformer 20.
  • the amplitude transformer 20 is integrally connected to the parts 16 and 14. At its end, it also merges into an atomizing plate 21.
  • the parts 20, 21 are axially penetrated centrally by the aforementioned bore.
  • the liquid to be atomized is conveyed onto the surface of the atomizing plate 21, where fine atomization of the liquid takes place due to the high-frequency vibrations of the atomizing plate 21.
  • the drawing also makes it clear that the parts 16, 20 and 21 are concentrically surrounded by an approximately cylindrical housing, which is numbered 22 in total.
  • the housing 22 is placed on a flange 23 formed between the amplitude transformer 20 and the transducer element 16.
  • Two annular seals 24, 25 are arranged on both sides of the flange 23, which ensure a seal between the high-voltage-carrying piezoelectric transducer part 10 and the amplitude transformer 20 in contact with liquid.
  • the necessary fastening of housing 22 and seals 24, 25 to flange 23 is provided by a thrust washer 26 and a circlip 27 acting thereon, which is fixed in a groove 28 of housing 22.
  • the housing 22 has a radial bore 29 which is penetrated by the liquid line 19.
  • the front part of the amplitude transformer 20, including the atomizing plate 21, is surrounded within the housing 22 by an attachment, generally designated 30, which carries a sieve-shaped membrane 31 on its front side.
  • the attachment 30 is - as explained in detail below - held on the housing 22 such that the membrane rests on the atomizing plate 21 under resilient prestress.
  • the attachment 30 consists of two parts arranged concentrically to one another, an inner first attachment part 32 carrying the membrane 31 and an outer second attachment part 33 serving for fastening the entire attachment 30 to the housing 22.
  • the first attachment part 32 has a radially outwardly directed collar 34
  • the second attachment part 33 has a radially inwardly directed paragraph 35.
  • a helical compression spring 36 is arranged in such a way that the sieve-shaped membrane 31 is resiliently held in contact with the atomizing plate 21 and the reaction force of the helical compression spring 36 is introduced into the second attachment part 33 fixed to the housing.
  • the helical compression spring 36 is supported on the one hand on the collar 34 and on the other hand on the shoulder 35.
  • annular gap 37 which serves to receive the helical compression spring 36 due to the design features described above.
  • the second attachment part 33 is designed as a union nut and screwed onto a corresponding external thread 38 of the housing 22.
  • the union nut 33 can be fastened to the housing 22 by means of a bayonet or snap connection.
  • the helical compression spring 36 is permanently attached at 40 by a press fit in the second attachment part 33.
  • the membrane 31 is attached to the front end of the first attachment part 32.
  • the first attachment part 32 accordingly extends - starting from the atomizing plate 21 - backwards.
  • the first attachment part 32 consists of two concentric sleeves 41, 42, the outer sleeve 41 having a collar 43 which overlaps the inner sleeve 42 at the front end.
  • the membrane 31 is glued between the front end face of the inner sleeve 42 and the collar 43.
  • the first attachment part 32 can also be formed in one piece as a plastic injection-molded part and the membrane 31 can be encapsulated by the material of the first attachment part 32 at its edge.

Abstract

An ultransonic atomizer for liquids comprises a piezoelectric transducer (16) mechanically coupled to an amplitude transformer (20), an atomizing disk (21) mounted to the free end of the amplitude transformer (20), a housing (22) enclosing at least the amplitude transformer (20) and a cap (30) supporting a sieve-like diaphragm (31). The cap (30) is so mounted to the housing (22) that the diaphragm (31) rests on the atomizing disk (21). The cap (30) consists of two mutually concentric cap parts (32, 33) of which one (32) supports the diaphragm (31) and the second (33) serves to mount the entire cap (30) on the housing (22). A spring (36) is so mounted between the two cap parts (32, 33) that the sieve-like diaphragm (31) is held elastically against the atomizing disk (21) and that the opposing force from the spring (36) thereby is transmitted into the second cap part (33) fixed in the housing. Such a liquid-atomizer is characterized in that the diaphragm (31) always rests with a precisely defined prestressing on the atomizing disk (21), whereby operational reliablity heretofore not yet achieved with the previous ultrasonic liquid atomizers is obtained.

Description

Die Erfindung bezieht sich auf einen Ultraschall-Flüssigkeitszerstäuber nach dem Oberbegriff des Patentanspruchs I.The invention relates to an ultrasonic liquid atomizer according to the preamble of claim I.

Ein Ultraschall-Flüssigkeitszerstäuber, der einen Teil der vorbezeichneten Merkmale aufweist, ist durch die DE-PS 32 33 901 bekannt geworden. Eine teilweise Weiterentwicklung dieses bekannten Ultraschall-Flüssigkeitszerstäubers zeigt die BE-A 902.301. Sie besteht in einer auf dem Zerstäuberteller aufliegenden siebartigen Membran, die bewirkt, daß die vom Zerstäuberteller abnebelnden Tröpfchen über eine bestimmte Strecke in gezieltem Strahl geführt werden. Die strahlförmig gerichtete Abnebelung bedeutet einen entscheidenden Vorteil in dem Bestreben, die Tröpfchen möglichst an diejenigen Stellen des zu besprühenden Gegenstands zu bringen, an denen ihr Auftreffen erwünscht ist. Im einzelnen besteht die bekannte Vorrichtung nach BE-A 902.301 aus einem festen, die siebförmige Membran tragenden Aufsatzstück, das über eine starre Verbindung auf dem Gehäuse des Uitraschall-Flüssigkeitszerstäubers befestigt ist. Hierdurch ist, bedingt durch die unvermeidlichen Toleranzen aller Bauteile, nicht gewährleistet, daß die Membran immer mit einer definierten Vorspannung auf dem Zerstäuberteller aufliegt. So hat eine etwaige zu starke Vorspannkraft die nachteilige Wirkung, daß der Zerstäuberteller gebremst wird und somit nicht mehr schwingen kann. Eine zu geringe Vorspannung oder gar ein Luftspalt zwischen Membran und Zerstäuberteller dagegen würde den Nachteil bedeuten, daß die angestrebte Wirkung der Membran, nämlich den Flüssigkeitsfilm gleichmäßig auf dem Zerstäuberteller zu verteilen, nicht mehr zum Tragen kommt und die vom Zerstäuberteller abgenebelten Tropfen vielmehr in der Membran hängen bleiben.An ultrasonic liquid atomizer, which has a part of the aforementioned features, has become known from DE-PS 32 33 901. BE-A 902.301 shows a partial further development of this known ultrasonic liquid atomizer. It consists of a sieve-like membrane resting on the atomizing plate, which causes the droplets atomized from the atomizing plate to be guided in a targeted jet over a certain distance. The jet-shaped misting means a decisive advantage in the endeavor to bring the droplets as far as possible to those places on the object to be sprayed where they are desired to hit. In particular, the known device according to BE-A 902.301 consists of a fixed attachment piece which carries the sieve-shaped membrane and which is fastened to the housing of the ultrasound liquid atomizer via a rigid connection. Due to the inevitable tolerances of all components, this does not guarantee that the membrane always rests on the atomizing plate with a defined pre-tension. Any pre-tensioning force that is too strong has the disadvantageous effect that the atomizing plate is braked and therefore can no longer oscillate. A too low pre-tension or even an air gap between the membrane and the atomizer plate would mean the disadvantage that the desired effect of the membrane, namely to distribute the liquid film evenly on the atomizer plate, no longer comes into play and the drops atomized by the atomizer plate would rather be in the membrane get stuck.

Ausgehend von dem geschilderten Stand der Technik ist es die Aufgabe der vorliegenden Erfindung, einen Ultraschall-Flüssigkeitszerstäuber der eingangs bezeichneten Gattung zu schaffen, bei dem die Membran immer mit einer genau definierten Vorspannung auf dem Zerstäuberteller aufliegt und der somit die bei bisherigen Ultraschall-Flüssigkeitszerstäubern der in Rede stehenden Art noch nicht erreichte Betriebssicherheit gewährleistet.Starting from the described prior art, it is the object of the present invention to provide an ultrasonic liquid atomizer of the type mentioned at the outset, in which the membrane always rests on the atomizer plate with a precisely defined pretension and which thus is the same as in previous ultrasonic liquid atomizers Guaranteed operational safety not yet achieved in question.

Gemäß der Erfindung wird die Aufgabe durch die im kennzeichnenden Teil des Patentanspruchs I angegebenen Merkmale gelöst.According to the invention the object is achieved by the features specified in the characterizing part of patent claim I.

Vorteilhafte Ausgestaltungen der Erfindung können den Unteransprüchen entnommen werden.Advantageous embodiments of the invention can be found in the subclaims.

Zur Veranschaulichung der Erfindung dient ein in der Zeichnung dargestelltes Ausführungsbeispiel, das nachstehend beschrieben ist. Die Zeichnung zeigt im einzelnen - teils in Seitenansicht, teils im vertikalen Längsschnitt - eine Ausführungsform eines Ultraschall-Flüssigkeitszerstäubers.An exemplary embodiment shown in the drawing, which is described below, serves to illustrate the invention. The drawing shows in detail - partly in side view, partly in vertical longitudinal section - an embodiment of an ultrasonic liquid atomizer.

Es bezeichnet 10 ein piezoelektrisches Wandlerteil, welches zur Umformung von elektrischer in mechanische Schwingungsenergie dient. Das piezoelektrische Wandlerteil 10 besteht aus zwei Keramikscheiben II, 12. Zwischen den beiden Keramikscheiben 11, 12 des piezoelektrischen Wandlerteils 10 liegt eine mit 13 bezeichnet Elektrode, die einen (in der Zeichnung nicht gezeigten) elektrischen Anschluß nach außen enthält. Die piezoelektrischen Scheiben II, 12 sitzen konzentrisch auf einem Zapfenteil 14, welches ein Gewinde 15 besitzt. Nach der anderen Seite hin (in der Zeichnung rechts) verbreitert sich das Zapfenteil 14 absatzartig zu einem Wandlerelement 16, welches als rechtsseitiger axialer Anschlag für die drei piezoelektrischen Scheiben II, 12, 13 dient. An der linken Seite erfolgt die axiale Fixierung der piezoelektrischen Scheiben II, 12, 13 durch eine Mutter 17, die auf das Gewinde 15 aufgeschraubt ist.It designates 10 a piezoelectric transducer part, which is used to transform electrical into mechanical vibration energy. The piezoelectric transducer part 10 consists of two ceramic disks II, 12. Between the two ceramic disks 11, 12 of the piezoelectric transducer part 10 is an electrode designated 13, which contains an electrical connection (not shown in the drawing) to the outside. The piezoelectric disks II, 12 sit concentrically on a pin part 14, which has a thread 15. To the other side (on the right in the drawing), the pin part 14 widens like a shoulder to a transducer element 16, which serves as a right-sided axial stop for the three piezoelectric disks II, 12, 13. On the left side, the piezoelectric disks II, 12, 13 are axially fixed by a nut 17, which is screwed onto the thread 15.

Wie weiterhin aus der Zeichnung hervorgeht, besitzt das Wandlerelement 16 eine seitliche Anschlußbohrung 18, in die eine der Flüssigkeitszufuhr dienende Leitung 19 einmündet. Die durch die Leitung 19 zugeführte Flüssigkeit gelangt in eine sich innerhalb eines Amplitudentransformators 20 erstreckende Axialbohrung (nicht gezeigt). Der Amplitudentransformator 20 ist einstückig mit den Teilen 16 und 14 verbunden. Er geht an seinem Ende - ebenfalls einstückig - in einen Zerstäuberteller 21 über. Die Teile 20, 21 werden von der bereits erwähnten Bohrung mittig axial durchsetzt. Die zu zerstäubende Flüssigkeit wird auf die Oberfläche des Zerstäubertellers 21 gefördert, wo aufgrund der hochfrequenten Schwingungen des Zerstäubertellers 21 eine feine Zerstäubung der Flüssigkeit erfolgt.As can further be seen from the drawing, the transducer element 16 has a lateral connection bore 18 into which a line 19 serving for the supply of liquid opens. The liquid supplied through the line 19 enters an axial bore (not shown) which extends within an amplitude transformer 20. The amplitude transformer 20 is integrally connected to the parts 16 and 14. At its end, it also merges into an atomizing plate 21. The parts 20, 21 are axially penetrated centrally by the aforementioned bore. The liquid to be atomized is conveyed onto the surface of the atomizing plate 21, where fine atomization of the liquid takes place due to the high-frequency vibrations of the atomizing plate 21.

Die Zeichnung macht weiterhin deutlich, daß die Teile 16, 20 und 21 konzentrisch von einem etwa zylindrischen Gehäuse umgeben sind, das insgesamt mit 22 beziffert ist. Das Gehäuse 22 ist auf einen zwischen Amplitudentransformator 20 und Wandlerelement 16 ausgebildeten Flansch 23 aufgesetzt. Beidseitig des Flansches 23 sind zwei ringförmige Dichtungen 24, 25 angeordnet, die eine Abdichtung zwischen dem hochspannungsführenden piezoelektrischen Wandlerteil 10 und dem mit Flüssigkeit in Kontakt stehenden Amplitudentransformator 20 gewährleisten. Für die erforderliche Befestigung von Gehäuse 22 und Dichtungen 24, 25 am Flansch 23 sorgen eine Druckscheibe 26 und ein diese beaufschlagender Sicherungsring 27, der in einer Nut 28 des Gehäuses 22 fixiert ist. Das Gehäuse 22 weist eine Radialbohrung 29 auf, die von der Flüssigkeitsleitung 19 durchsetzt ist.The drawing also makes it clear that the parts 16, 20 and 21 are concentrically surrounded by an approximately cylindrical housing, which is numbered 22 in total. The housing 22 is placed on a flange 23 formed between the amplitude transformer 20 and the transducer element 16. Two annular seals 24, 25 are arranged on both sides of the flange 23, which ensure a seal between the high-voltage-carrying piezoelectric transducer part 10 and the amplitude transformer 20 in contact with liquid. The necessary fastening of housing 22 and seals 24, 25 to flange 23 is provided by a thrust washer 26 and a circlip 27 acting thereon, which is fixed in a groove 28 of housing 22. The housing 22 has a radial bore 29 which is penetrated by the liquid line 19.

Wie des weiteren aus der Zeichnung hervorgeht, ist der vordere Teil des Amplitudentransformators 20, einschließlich Zerstäuberteller 21, innerhalb des Gehäuses 22 von einem insgesamt mit 30 bezeichneten Aufsatz umgeben, der an seiner Vorderseite eine siebförmige Membran 31 trägt. Der Aufsatz 30 ist - wie weiter unten im einzelnen erläutert - so am Gehäuse 22 gehalten, daß die Membran unter federnder Vorspannung auf dem Zerstäuberteller 21 aufliegt.As can further be seen from the drawing, the front part of the amplitude transformer 20, including the atomizing plate 21, is surrounded within the housing 22 by an attachment, generally designated 30, which carries a sieve-shaped membrane 31 on its front side. The attachment 30 is - as explained in detail below - held on the housing 22 such that the membrane rests on the atomizing plate 21 under resilient prestress.

Der Aufsatz 30 besteht aus zwei konzentrisch zueinander angeordneten Teilen, wobei ein innenliegender erster Aufsatzteil 32 die Membran 31 trägt und ein außenliegender zweiter Aufsatzteil 33 zur Befestigung des gesamten Aufsatzes 30 am Gehäuse 22 dient. Der erste Aufsatzteil 32 besitzt einen radial nach außen gerichteten Bund 34, und der zweite Aufsatzteil 33 weist einen radial nach innen gerichteten Absatz 35 auf. Zwischen den beiden Aufsatzteilen 32, 33 und diese in zueinander entgegengesetzten Axialrichtungen beaufschlagend ist eine Schraubendruckfeder 36 so angeordnet, daß die siebförmige Membran 31 federnd mit dem Zerstäuberteller 21 in Anlage gehalten und die Reaktionskraft der Schraubendruckfeder 36 in den gehäusefesten zweiten Aufsatzteil 33 eingeleitet wird. Hierbei stützt sich die Schraubendruckfeder 36 einerseits am Bund 34, andererseits am Absatz 35 ab. Zwischen der Außenwandung des zylindrischen ersten Aufsatzteils 32 und der Innenwandung des Gehäuses 22 ergibt sich durch die im Vorstehenden beschriebenen Konstruktionsmerkmale ein Ringspalt 37, der zur Aufnahme der Schraubendruckfeder 36 dient.The attachment 30 consists of two parts arranged concentrically to one another, an inner first attachment part 32 carrying the membrane 31 and an outer second attachment part 33 serving for fastening the entire attachment 30 to the housing 22. The first attachment part 32 has a radially outwardly directed collar 34, and the second attachment part 33 has a radially inwardly directed paragraph 35. Between the two attachment parts 32, 33 and acting on them in opposite axial directions, a helical compression spring 36 is arranged in such a way that the sieve-shaped membrane 31 is resiliently held in contact with the atomizing plate 21 and the reaction force of the helical compression spring 36 is introduced into the second attachment part 33 fixed to the housing. The helical compression spring 36 is supported on the one hand on the collar 34 and on the other hand on the shoulder 35. Between the outer wall of the cylindrical first attachment part 32 and the inner wall of the housing 22 there is an annular gap 37 which serves to receive the helical compression spring 36 due to the design features described above.

Wie die Zeichnung weiterhin zeigt, ist der zweite Aufsatzteil 33 als Überwurfmutter ausgebildet und auf ein entsprechendes Außengewinde 38 des Gehäuses 22 aufgeschraubt. Alternativ zum Gewindeanschluß kann die Überwurfmutter 33 durch eine Bajonett- oder Schnappverbindung an dem Gehäuse 22 befestigbar sein.As the drawing also shows, the second attachment part 33 is designed as a union nut and screwed onto a corresponding external thread 38 of the housing 22. As an alternative to the threaded connection, the union nut 33 can be fastened to the housing 22 by means of a bayonet or snap connection.

Die Schraubendruckfeder 36 ist bei 40 durch einen Preßsitz im zweiten Aufsatzteil 33 unlösbar befestigt.The helical compression spring 36 is permanently attached at 40 by a press fit in the second attachment part 33.

Bei dem dargestellten Ausführungsbeispiel ist die Membran 31 am vorderen Ende des ersten Aufsatzteils 32 befestigt. Der erste Aufsatzteil 32 erstreckt sich demgemäß - ausgehend vom Zerstäuberteller 21 - nach rückwärts. Hierbei besteht der erste Aufsatzteil 32 aus zwei konzentrischen Hülsen 41, 42, wobei die äußere Hülse 41 einen die innere Hülse 42 am vorderen Ende übergreifenden Bund 43 aufweist. Die Membran 31 ist zwischen der vorderen Stirnfläche der inneren Hülse 42 und dem Bund 43 eingeklebt.In the illustrated embodiment, the membrane 31 is attached to the front end of the first attachment part 32. The first attachment part 32 accordingly extends - starting from the atomizing plate 21 - backwards. Here, the first attachment part 32 consists of two concentric sleeves 41, 42, the outer sleeve 41 having a collar 43 which overlaps the inner sleeve 42 at the front end. The membrane 31 is glued between the front end face of the inner sleeve 42 and the collar 43.

Nach einer denkbaren anderen Ausführungsform kann aber auch der erste Aufsatzteil 32 einteilig als Kunststoff-Spritzteil ausgebildet und die Membran 31 an ihrem Rand von dem Material des ersten Aufsatzteils 32 umspritzt sein.According to another conceivable embodiment, however, the first attachment part 32 can also be formed in one piece as a plastic injection-molded part and the membrane 31 can be encapsulated by the material of the first attachment part 32 at its edge.

Claims (12)

1. An ultrasonic atomizer for liquids, comprising a piezoelectric transducer mechanically coupled to an amplitude transformer (also called "horn" or "blowpipe"), further an atomizing disk mounted on the free end of the amplitude transformer, further a housing enclosing at least the amplitude transformer and a cap supporting a sieve-like diaphragm and so mounted on the housing that the diaphragm rests on the atomizing disk, characterized in that the cap (30) consists of two parts mounted mutually concentrically, an inner first cap part (32) supporting the diaphragm (31) and an outer, second cap part (33) serving to mount the entire cap (30) on the housing (22) and in that spring means (36) are mounted between the two cap parts (32, 33) and loading them into mutually opposite axial directions in such a manner that the sieve-like diaphragm (31) is held elastically against the atomizing disk (21) and that the opposing force from the spring means (36) is transmitted thereby into the second cap part (33) fixed in the housing.
2. Ultrasonic liquid-atomizer defined in claim 1, characterized in that the first part (32) comprises a radially outward collar (34) and the second cap part (33) comprises a radially inward offset (35) and in that the spring means (36) act on one hand on the collar (34) and on the other on the offset (35).
3. Ultrasonic liquid-atomizer defined in claim 2, characterized by an annular gap (37) receiving the spring means (36) being present between the outer wall of the cylindrical first cap part (32) and the inner wall of the housing (22).
4. Ultrasonic liquid-atomizer defined in claim 3, characterized in that the annular gap (37) is axially bounded at its front end on the side of the atomizing disk by the offset (35) of the second cap part (32) and at its rear end by the collar (34) of the first cap part (32) and in that a helical compression spring (36) is present in the annular gap (37).
5. Ultrasonic liquid-atomizer defined in claim 2, characterized in that the spring means (36) is undetachably mounted by a press-fit into the second cap part (33).
6. Ultrasonic liquid-atomizer defined in claim 1, characterized in that the diaphragm (31) is fastened to the front end of the first cap part (32) and in that the first cap part (32) - starting from the atomizing disk (21) - extends rearward.
7. Ultrasonic liquid-atomizer defined in claim 6, characterized in that the first cap part (32) consists of two concentric sleeves (41, 42), the outer sleeve (41) comprising a bead (43) overlapping the inner sleeve (42) at the front end, and in that the diaphragm (31) is bonded between the front end face of the inner sleeve (42) and the collar (43).
8. Ultrasonic liquid-atomizer defined in claim 1, characterized in that the first cap part (32) is integrally injection-molded and in that the diaphragm (31) is enclosed at its edge by the injection-molded material of the first cap part (32).
9. Ultrasonic liquid-atomizer defined in claim 1, characterized in that the second cap part (33) in the form of a cap-nut is screwed onto a corresponding outer thread (38) of the housing (22).
10. Ultrasonic liquid-atomizer defined in claim 1, characterized in that the second cap part (33) is a screw-cap and comprises a bayonet-connection to the housing (22).
11. Ultrasonic liquid-atomizer defined in claim 1 characterized in that the second cap part (33) in the form of a screw-cap comprises a snap-in connection to the housing (22).
12. Ultrasonic liquid-atomizer defined in claim 1, characterized in that the housing (22) is mounted on a flange (23) formed between the converter (16) and the amplitude transformer (20) and is sealed relative to the converter (16) by sealing rings (24, 25) mounted on both sides of the flange (23) and is fastened by a pressure disk (26) with securing ring (27) to the flange (23).
EP87103907A 1987-03-17 1987-03-17 Ultrasonic liquid sprayer Expired EP0282616B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP87103907A EP0282616B1 (en) 1987-03-17 1987-03-17 Ultrasonic liquid sprayer
DE8787103907T DE3760650D1 (en) 1987-03-17 1987-03-17 Ultrasonic liquid sprayer
AT87103907T ATE46836T1 (en) 1987-03-17 1987-03-17 ULTRASONIC LIQUID ATOMIZER.
JP63009751A JPS63252569A (en) 1987-03-17 1988-01-21 Ultrasonic liquid atomizer
BR8800272A BR8800272A (en) 1987-03-17 1988-01-25 ULTRASOUND LIQUID ATOMIZER
US07/167,136 US4796807A (en) 1987-03-17 1988-03-11 Ultrasonic atomizer for liquids

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87103907A EP0282616B1 (en) 1987-03-17 1987-03-17 Ultrasonic liquid sprayer

Publications (2)

Publication Number Publication Date
EP0282616A1 EP0282616A1 (en) 1988-09-21
EP0282616B1 true EP0282616B1 (en) 1989-10-04

Family

ID=8196844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87103907A Expired EP0282616B1 (en) 1987-03-17 1987-03-17 Ultrasonic liquid sprayer

Country Status (6)

Country Link
US (1) US4796807A (en)
EP (1) EP0282616B1 (en)
JP (1) JPS63252569A (en)
AT (1) ATE46836T1 (en)
BR (1) BR8800272A (en)
DE (1) DE3760650D1 (en)

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Also Published As

Publication number Publication date
DE3760650D1 (en) 1989-11-09
BR8800272A (en) 1988-09-27
JPS63252569A (en) 1988-10-19
US4796807A (en) 1989-01-10
ATE46836T1 (en) 1989-10-15
EP0282616A1 (en) 1988-09-21

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