EP0282616A1 - Ultrasonic liquid sprayer - Google Patents

Ultrasonic liquid sprayer Download PDF

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Publication number
EP0282616A1
EP0282616A1 EP87103907A EP87103907A EP0282616A1 EP 0282616 A1 EP0282616 A1 EP 0282616A1 EP 87103907 A EP87103907 A EP 87103907A EP 87103907 A EP87103907 A EP 87103907A EP 0282616 A1 EP0282616 A1 EP 0282616A1
Authority
EP
European Patent Office
Prior art keywords
attachment part
housing
ultrasonic liquid
liquid atomizer
atomizer according
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
EP87103907A
Other languages
German (de)
French (fr)
Other versions
EP0282616B1 (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 AT87103907T priority Critical patent/ATE46836T1/en
Priority to DE8787103907T priority patent/DE3760650D1/en
Priority to EP87103907A priority patent/EP0282616B1/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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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
    • 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 1.
  • An ultrasonic liquid atomizer which has a part of the aforementioned features, has become known from DE-PS 32 33 90l.
  • the BE-PA 902.30l shows a partial further development of this well-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-PA 902.30l consists of a fixed attachment piece which carries the sieve-shaped membrane and which is fastened to the housing of the ultrasonic 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 atomizing plate would mean the disadvantage that the desired effect of the membrane, namely to distribute the liquid film evenly on the atomizing plate, no longer comes into play and that mists off the atomizing plate Rather, the ten drops get stuck in the membrane.
  • 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.
  • l0 a piezoelectric transducer part, which is used to transform electrical into mechanical vibration energy.
  • the piezoelectric transducer part l0 consists of two ceramic disks ll, l2. Between the two ceramic disks ll, l2 of the piezoelectric transducer part l0 is an electrode designated l3, which contains an electrical connection (not shown in the drawing) to the outside.
  • the piezoelectric disks ll, l2 sit concentrically on a pin part l4, which has a thread l5.
  • the pin part l4 widens like a shoulder to a transducer element l6, which serves as a right-sided axial stop for the three piezoelectric disks ll, l2, l3.
  • the piezoelectric is fixed axially on the left side Washers ll, l2, l3 by a nut l7, which is screwed onto the thread l5.
  • the converter element l6 has a lateral connection bore l8, into which a line l9 serving for the liquid supply opens.
  • the liquid supplied through the line 19 passes into an axial bore (not shown) which extends within an amplitude transformer 20.
  • the amplitude transformer 20 is connected in one piece to the parts 16 and 14. At the end, it also merges into an atomizing plate 2l.
  • the parts 20, 2l are axially penetrated centrally by the aforementioned bore.
  • the liquid to be atomized is conveyed onto the surface of the atomizing plate 2l, where fine atomization of the liquid takes place due to the high-frequency vibrations of the atomizing plate 2l.
  • the drawing also makes it clear that the parts l6, 20 and 2l 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 converter 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 that is 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 atomizing plate 2l, is surrounded within the housing 22 by an attachment, designated overall by 30, which is attached to it Front carries a sieve-shaped membrane 31.
  • the attachment 30 is - as explained in more 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 shoulder 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 3l attached to the front end of the first attachment part 32.
  • the first attachment part 32 accordingly extends - starting from the atomizing plate 2l - backwards.
  • the first attachment part 32 consists of two concentric sleeves 4l, 42, the outer sleeve 4l having a collar 43 which overlaps the inner sleeve 42 at the front end.
  • the membrane 3l 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 3l can be extrusion-coated around the edge of the material of the first attachment part 32.

Landscapes

  • Special Spraying Apparatus (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
  • Catching Or Destruction (AREA)
  • Cosmetics (AREA)

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 l.The invention relates to an ultrasonic liquid atomizer according to the preamble of claim 1.

Ein Ultraschall-Flüssigkeitszerstäuber, der einen Teil der vorbezeichneten Merkmale aufweist, ist durch die DE-PS 32 33 90l bekannt geworden. Eine teilweise Weiterentwicklung dieses bekannten Ultraschall-Flüssigkeitszerstäubers zeigt die BE-PA 902.30l. 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-PA 902.30l aus einem festen, die siebförmige Membran tragenden Aufsatzstück, das über eine starre Verbindung auf dem Gehäuse des Ultraschall-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 abgenebel­ ten 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 90l. The BE-PA 902.30l shows a partial further development of this well-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-PA 902.30l consists of a fixed attachment piece which carries the sieve-shaped membrane and which is fastened to the housing of the ultrasonic 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 atomizing plate would mean the disadvantage that the desired effect of the membrane, namely to distribute the liquid film evenly on the atomizing plate, no longer comes into play and that mists off the atomizing plate Rather, the ten drops get stuck in the membrane.

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.Based on the described prior art, it is the object of the present invention to provide an ultrasonic liquid atomizer of the type described at the outset, in which the membrane always rests on the atomizing plate with a precisely defined pretension and which is therefore 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 l angegebenen Merkmale gelöst.According to the invention, the object is achieved by the features specified in the characterizing part of patent claim 1.

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 l0 ein piezoelektrisches Wandlerteil, welches zur Umformung von elektrischer in mechanische Schwingungs­energie dient. Das piezoelektrische Wandlerteil l0 besteht aus zwei Keramikscheiben ll, l2. Zwischen den beiden Keramik­scheiben ll, l2 des piezoelektrischen Wandlerteils l0 liegt eine mit l3 bezeichnet Elektrode, die einen (in der Zeichnung nicht gezeigten) elektrischen Anschluß nach außen enthält. Die piezoelektrischen Scheiben ll, l2 sitzen konzentrisch auf einem Zapfenteil l4, welches ein Gewinde l5 besitzt. Nach der anderen Seite hin (in der Zeichnung rechts) verbreitert sich das Zapfenteil l4 absatzartig zu einem Wandlerelement l6, welches als rechtsseitiger axialer Anschlag für die drei piezoelektrischen Scheiben ll, l2, l3 dient. An der linken Seite erfolgt die axiale Fixierung der piezoelektrischen Scheiben ll, l2, l3 durch eine Mutter l7, die auf das Gewinde l5 aufgeschraubt ist.It denotes l0 a piezoelectric transducer part, which is used to transform electrical into mechanical vibration energy. The piezoelectric transducer part l0 consists of two ceramic disks ll, l2. Between the two ceramic disks ll, l2 of the piezoelectric transducer part l0 is an electrode designated l3, which contains an electrical connection (not shown in the drawing) to the outside. The piezoelectric disks ll, l2 sit concentrically on a pin part l4, which has a thread l5. To the other side (on the right in the drawing), the pin part l4 widens like a shoulder to a transducer element l6, which serves as a right-sided axial stop for the three piezoelectric disks ll, l2, l3. The piezoelectric is fixed axially on the left side Washers ll, l2, l3 by a nut l7, which is screwed onto the thread l5.

Wie weiterhin aus der Zeichnung hervorgeht, besitzt das Wand­lerelement l6 eine seitliche Anschlußbohrung l8, in die eine der Flüssigkeitszufuhr dienende Leitung l9 einmündet. Die durch die Leitung l9 zugeführte Flüssigkeit gelangt in eine sich innerhalb eines Amplitudentransformators 20 er­streckende Axialbohrung (nicht gezeigt). Der Amplitudentrans­formator 20 ist einstückig mit den Teilen l6 und l4 verbun­den. Er geht an seinem Ende - ebenfalls einstückig - in einen Zerstäuberteller 2l über. Die Teile 20, 2l werden von der bereits erwähnten Bohrung mittig axial durchsetzt. Die zu zerstäubende Flüssigkeit wird auf die Oberfläche des Zerstäubertellers 2l gefördert, wo aufgrund der hochfre­quenten Schwingungen des Zerstäubertellers 2l eine feine Zer­stäubung der Flüssigkeit erfolgt.As can further be seen from the drawing, the converter element l6 has a lateral connection bore l8, into which a line l9 serving for the liquid supply opens. The liquid supplied through the line 19 passes into an axial bore (not shown) which extends within an amplitude transformer 20. The amplitude transformer 20 is connected in one piece to the parts 16 and 14. At the end, it also merges into an atomizing plate 2l. The parts 20, 2l are axially penetrated centrally by the aforementioned bore. The liquid to be atomized is conveyed onto the surface of the atomizing plate 2l, where fine atomization of the liquid takes place due to the high-frequency vibrations of the atomizing plate 2l.

Die Zeichnung macht weiterhin deutlich, daß die Teile l6, 20 und 2l 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 l6 ausgebildeten Flansch 23 aufgesetzt. Beidseitig des Flansches 23 sind zwei ringförmige Dichtungen 24, 25 angeordnet, die eine Abdichtung zwischen dem hochspan­nungsführenden piezoelektrischen Wandlerteil l0 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 l9 durchsetzt ist.The drawing also makes it clear that the parts l6, 20 and 2l 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 converter 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 that is 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 2l, 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 atomizing plate 2l, is surrounded within the housing 22 by an attachment, designated overall by 30, which is attached to it Front carries a sieve-shaped membrane 31. The attachment 30 is - as explained in more 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 shoulder 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 3l am vorderen Ende des ersten Aufsatzteils 32 befestigt. Der erste Aufsatzteil 32 erstreckt sich demgemäß - ausgehend vom Zerstäuberteller 2l - nach rückwärts. Hierbei besteht der erste Aufsatzteil 32 aus zwei konzentrischen Hülsen 4l, 42, wobei die äußere Hülse 4l einen die innere Hülse 42 am vorderen Ende übergreifenden Bund 43 aufweist. Die Membran 3l ist zwischen der vorderen Stirnfläche der inneren Hülse 42 und dem Bund 43 eingeklebt.In the illustrated embodiment, the membrane 3l attached to the front end of the first attachment part 32. The first attachment part 32 accordingly extends - starting from the atomizing plate 2l - backwards. Here, the first attachment part 32 consists of two concentric sleeves 4l, 42, the outer sleeve 4l having a collar 43 which overlaps the inner sleeve 42 at the front end. The membrane 3l 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 3l 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 3l can be extrusion-coated around the edge of the material of the first attachment part 32.

Claims (12)

1. Ultraschall-Flüssigkeitszerstäuber, mit einem piezoelek­trischen Wandlerelement, das mechanisch mit einem Amplitudentransformator (auch als "Horn" oder "Rüssel" bezeichnet) gekoppelt ist, mit einem am freien Ende des Amplitudentransformators angeordneten Zerstäuberteller, ferner mit einem zumindest den Amplitudentransformator umgebenden Gehäuse und mit einem eine siebförmige Membran tragenden Aufsatz, der am Gehäuse derart befe­stigt ist, daß die Membran auf dem Zerstäuberteller aufliegt,
dadurch gekennzeichnet, daß der Aufsatz (30) aus zwei konzentrisch zueinander angeordneten Teilen be­steht, wobei ein innenliegender erster Aufsatzteil (32) die Membran (3l) trägt und ein außenliegender zweiter Aufsatzteil (33) zur Befestigung des gesamten Aufsatzes (30) am Gehäuse (22) dient, und daß zwischen den beiden Aufsatzteilen (32, 33) und diese in zueinander entgegen­gesetzten Axialrichtungen beaufschlagend Federmittel (36) angeordnet sind, derart, daß die siebförmige Membran (3l) federnd mit dem Zerstäuberteller (2l) in Anlage gehalten und die Reaktionskraft der Federmittel (36) hierbei in den gehäusefesten zweiten Aufsatzteil (33) eingeleitet wird.1. Ultrasonic liquid atomizer, with a piezoelectric transducer element which is mechanically coupled to an amplitude transformer (also referred to as a "horn" or "proboscis"), with an atomizing plate arranged at the free end of the amplitude transformer, furthermore with a housing surrounding the amplitude transformer and with an attachment carrying a sieve-shaped membrane, which is attached to the housing in such a way that the membrane rests on the atomizing plate,
characterized in that the attachment (30) consists of two parts arranged concentrically to one another, an inner first attachment part (32) carrying the membrane (3l) and an external second attachment part (33) for fastening the entire attachment (30) to the housing ( 22), and that spring means (36) are arranged between the two attachment parts (32, 33) and acting on them in opposite axial directions, such that the sieve-shaped membrane (3l) resiliently held in contact with the atomizing plate (2l) and the Reactive force of the spring means (36) is hereby introduced into the second attachment part (33) fixed to the housing. 2. Ultraschall-Flüssigkeitszerstäuber nach Anspruch l,
dadurch gekennzeichnet, daß der erste Aufsatzteil (32) einen radial nach außen gerichteten Bund (34) und der zweite Aufsatzteil (33) einen radial nach innen gerich­teten Absatz (35) aufweist und daß die Federmittel (36) einerseits am Bund (34), andererseits am Absatz (35) an­greifen.2. Ultrasonic liquid atomizer according to claim l,
characterized in that the first attachment part (32) has a radially outward collar (34) and the second attachment part (33) has a radially inward shoulder (35) and in that the spring means (36) on the one hand on the collar (34), on the other hand, attack the heel (35). 3. Ultraschall-Flüssigkeitszerstäuber nach Anspruch l oder 2,
dadurch gekennzeichnet, daß zwischen der Außenwandung des zylindrischen ersten Aufsatzteils (32) und der Innenwandung des Gehäuses (22) ein Ringspalt (37) ausgebildet ist, der zur Aufnahme der Federmittel (36) dient.3. Ultrasonic liquid atomizer according to claim l or 2,
characterized in that between the outer wall of the cylindrical first attachment part (32) and the An inner gap (37) is formed on the inner wall of the housing (22) and serves to receive the spring means (36). 4. Ultraschall-Flüssigkeitszerstäuber nach Anspruch 2 und 3,
dadurch gekennzeichnet, daß der Ringspalt (37) an seinem vorderen zerstäubertellerseitigen Ende vom Absatz (35) des zweiten Aufsatzteils (33) und an seinem rückwärtigen Ende vom Bund (34) des ersten Aufsatzteils (32) axial be­grenzt wird und daß in dem Ringspalt (37) eine Schrauben­druckfeder (36) angeordnet ist.4. Ultrasonic liquid atomizer according to claim 2 and 3,
characterized in that the annular gap (37) is axially delimited at its front end on the atomizer plate side by the shoulder (35) of the second attachment part (33) and at its rear end by the collar (34) of the first attachment part (32) and in that in the annular gap ( 37) a helical compression spring (36) is arranged. 5. Ultraschall-Flüssigkeitszerstäuber nach Anspruch 2, 3 oder 4,
dadurch gekennzeichnet, daß die Federmittel (36) durch einen Preßsitz im zweiten Aufsatzteil (33) unlösbar befestigt sind.5. Ultrasonic liquid atomizer according to claim 2, 3 or 4,
characterized in that the spring means (36) are permanently attached by a press fit in the second attachment part (33). 6. Ultraschall-Flüssigkeitszerstäuber nach einem oder mehreren der vorstehenden Ansprüche,
dadurch gekennzeichnet, daß die Membran (3l) am vorderen Ende des ersten Aufsatzteils (32) befestigt ist und der erste Aufsatzteil (32) sich - ausgehend vom Zerstäu­berteller (2l) - nach rückwärts erstreckt.6. Ultrasonic liquid atomizer according to one or more of the preceding claims,
characterized in that the membrane (3l) is attached to the front end of the first attachment part (32) and the first attachment part (32) - starting from the atomizing plate (2l) - extends backwards. 7. Ultraschall-Flüssigkeitszerstäuber nach Anspruch 6,
dadurch gekennzeichnet, daß der erste Aufsatzteil (32) aus zwei konzentrischen Hülsen (4l, 42) besteht, wobei die äußere Hülse (4l) einen die innere Hülse (42) am vorderen Ende übergreifenden Bund (43) aufweist, und daß die Membran (3l) zwischen der vorderen Stirnflä­che der inneren Hülse (42) und dem Bund (43) eingeklebt ist.7. Ultrasonic liquid atomizer according to claim 6,
characterized in that the first attachment part (32) consists of two concentric sleeves (4l, 42), the outer sleeve (4l) having a collar (43) overlapping the inner sleeve (42) at the front end, and in that the membrane ( 3l) is glued between the front end face of the inner sleeve (42) and the collar (43). 8. Ultraschall-Flüssigkeitszerstäuber nach einem oder meh­reren der Ansprüche l bis 6,
dadurch gekennzeichnet, daß der erste Aufsatzteil (32) einteilig als Kunststoff-Spritzteil ausgebildet und die Membran (31) an ihrem Rand von dem Material des ersten Aufsatzteils (32) umspritzt ist.8. Ultrasonic liquid atomizer according to one or more of claims 1 to 6,
characterized in that the first attachment part (32) formed in one piece as a plastic injection-molded part and the membrane (31) is overmolded at its edge by the material of the first attachment part (32). 9. Ultraschall-Flüssigkeitszerstäuber nach einem oder meh­reren der vorstehenden Ansprüche,
dadurch gekennzeichnet, daß der zweite Aufsatzteil (33) als Überwurfmutter ausgebildet und auf ein entspre­chendes Außengewinde (38) des Gehäuses (22) aufge­schraubt ist.9. Ultrasonic liquid atomizer according to one or more of the preceding claims,
characterized in that the second attachment part (33) is designed as a union nut and is screwed onto a corresponding external thread (38) of the housing (22). 10. Ultraschall-Flüssigkeitszerstäuber nach einem oder meh­reren der Ansprüche 1 bis 8,
dadurch gekennzeichnet, daß der zweite, als Überwurfmut­ter ausgebildete Aufsatzteil (33) eine Bajonettverbin­dung zum Gehäuse (22) aufweist.10. Ultrasonic liquid atomizer according to one or more of claims 1 to 8,
characterized in that the second attachment part (33) designed as a union nut has a bayonet connection to the housing (22). 11. Ultraschall-Flüssigkeitszerstäuber nach einem oder meh­reren der Ansprüche 1 bis 8,
dadurch gekennzeichnet, daß der zweite, als Überwurfmut­ter ausgebildete Aufsatzteil (33) eine Schnappverbin­dung zum Gehäuse (22) aufweist.11. Ultrasonic liquid atomizer according to one or more of claims 1 to 8,
characterized in that the second attachment part (33) designed as a union nut has a snap connection to the housing (22). 12. Ultraschall-Flüssigkeitszerstäuber nach einem oder meh­reren der vorstehenden Ansprüche,
dadurch gekennzeichnet, daß das Gehäuse (22) auf einen zwischen Wandlerelement (16) und Amplitudentransformator (20) ausgebildeten Flansch (23) aufgesetzt, mittels beidseitig des Flansches (23) angeordneter Dichtungs­ringe (24, 25) gegenüber dem Wandlerelement (16) abge­dichtet und durch eine Druckscheibe (26) mit Sicherungs­ring (27) an dem Flansch (23) befestigt ist.12. Ultrasonic liquid atomizer according to one or more of the preceding claims,
characterized in that the housing (22) is placed on a flange (23) formed between the transducer element (16) and the amplitude transformer (20), is sealed with respect to the transducer element (16) by means of sealing rings (24, 25) arranged on both sides of the flange (23) and is attached to the flange (23) by means of a thrust washer (26) with locking ring (27).
EP87103907A 1987-03-17 1987-03-17 Ultrasonic liquid sprayer Expired EP0282616B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AT87103907T ATE46836T1 (en) 1987-03-17 1987-03-17 ULTRASONIC LIQUID ATOMIZER.
DE8787103907T DE3760650D1 (en) 1987-03-17 1987-03-17 Ultrasonic liquid sprayer
EP87103907A EP0282616B1 (en) 1987-03-17 1987-03-17 Ultrasonic liquid sprayer
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 true EP0282616A1 (en) 1988-09-21
EP0282616B1 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
US4796807A (en) 1989-01-10
EP0282616B1 (en) 1989-10-04
DE3760650D1 (en) 1989-11-09
ATE46836T1 (en) 1989-10-15
BR8800272A (en) 1988-09-27
JPS63252569A (en) 1988-10-19

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