EP0342446A2 - Ultrasonic device - Google Patents
Ultrasonic device Download PDFInfo
- Publication number
- EP0342446A2 EP0342446A2 EP89108097A EP89108097A EP0342446A2 EP 0342446 A2 EP0342446 A2 EP 0342446A2 EP 89108097 A EP89108097 A EP 89108097A EP 89108097 A EP89108097 A EP 89108097A EP 0342446 A2 EP0342446 A2 EP 0342446A2
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- EP
- European Patent Office
- Prior art keywords
- sound
- liquid
- retaining ring
- ultrasonic
- emitting
- 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
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- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000002604 ultrasonography Methods 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000012528 membrane Substances 0.000 abstract description 8
- 230000010355 oscillation Effects 0.000 abstract description 4
- 230000006378 damage Effects 0.000 abstract 1
- 230000003628 erosive effect Effects 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 abstract 1
- 230000001678 irradiating effect Effects 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
Definitions
- the invention relates to a device for introducing ultrasonic vibrations into a liquid by means of ultrasonic vibrators, which are arranged on the bottom (of the wall) of a liquid container and, as a lambda / 2 vibrator, consist of two piezoelectric plates oscillating in push-pull, one of which are connected on the one hand with a sound-emitting cone and on the other hand with a counterweight.
- Devices of this type are required in particular for ultrasonic cleaning, the high tensile and compressive forces occurring in an ultrasound-excited liquid bath, in particular the mechanism of cavitation, effecting very good cleaning of the immersed workpieces.
- the introduction of the ultrasonic vibrations is effected in known devices of this type in that the ultrasonic vibrators are glued with their sound-emitting cone onto a wall or the bottom of such a liquid container and thereby set this wall or the bottom into vibrations which in turn apply these vibrations the liquid passes on.
- Such cleaning baths have proven particularly useful for workpieces of complex shapes, but are also used with advantage in precision mechanical units.
- the workpieces to be cleaned or the workpieces on which the ultrasonic vibrations are supposed to act are only exposed to these ultrasonic vibrations for a short period of time.
- the cavitation effect can therefore be metered through this period.
- this does not apply to the wall of the liquid container, which is constantly exposed to cavitation.
- This leads to "cavitation pitting", which leads to the container wall becoming leaky after some time.
- the cavitation pitting is of course particularly noticeable on the wall on which the ultrasound transmitter is attached.
- This wall acts as a sound-transmitting membrane, so it must transmit all the forces that ultimately lead to cavitation.
- moisture reaches the ultrasound transducers glued to the wall, which loosens these ultrasound transducers and thus destroys the system.
- a thicker membrane which would delay this cavitation pitting, cannot be used, since with the thickness of the membrane, the sound output or the efficiency of the entire device decreases significantly.
- the object of the invention is to provide a device which avoids this cavitation pitting on the liquid container walls or the membrane. This is achieved in the manner according to the invention in that the ultrasonic vibrators are held by means of a retaining ring which is connected near the piezoelectric plate to the sound-emitting cone and that they are held by means of this retaining ring are inserted into the liquid container directly or via a sleeve surrounding the counterweight.
- the ultrasonic transmitters with their sound-emitting cone glued to a wall, the membrane, of the liquid container, but they are inserted into the liquid container so that the sound-emitting cone protrudes directly into the liquid.
- the cavitation that then naturally occurs will now not remove the membrane or the wall of the liquid container, but the sound-emitting cone.
- the sound-emitting cone is made of solid metal, so that the abrasion caused by the cavitation on the sound-emitting cone is negligible in practice.
- This special mounting of the ultrasound transmitter is possible in that an oscillation node is formed in the piezoelectric plates with the oscillation amplitude zero; the maximum vibration amplitude results from the front surface of the sound-emitting cone.
- the retaining ring is attached to the base of the sound-emitting cone, where it lies against the piezoelectric plate, then this retaining ring is still close to the node, i.e. at a point where the sound-emitting cone is only with ge ringer vibration amplitude vibrates. This retaining ring is thereby also caused to vibrate, but with a very slight amplitude, so that there is hardly any fear of cavitation. However, the desired sound transmission to the liquid is practically not impaired, since this now takes place directly via the sound-emitting cone.
- the sound-emitting cone is made of corrosion-resistant material.
- the ultrasonic transducer can be inserted in the manner according to the invention in that the sound-emitting cone, as prescribed by the invention, is inserted near the piezoelectric plate into the container wall, which then serves as a "holder", or is welded to the container wall at this point.
- a retaining ring that has already been welded to the sound-emitting cone can also be welded into the container wall, as part of this wall.
- the retaining ring can also be made in one piece with the sound-emitting cone.
- the counterweight is surrounded by a sleeve which can be closed by a bottom on the underside except for an opening for the transducer feed lines.
- This provides a device that can be screwed onto the inner wall of the liquid container by a screw connection that seals at the bottom, so that the entire ultrasonic oscillator is sealed in the liquid and can act directly on the liquid.
- This device also has the advantage that if one of the ultrasonic transducers fails, this transducer can be easily replaced.
- Encapsulating the entire ultrasonic transducer has yet another advantage. It is now possible to let the sound-emitting cones protrude into the liquid container to different extents, thereby preventing standing waves from forming in the liquid. This is particularly the case if, according to a further feature of the invention, the end faces of the sound-emitting cones are each immersed in the liquid with a difference of lambda / 4. "Dead zones" that are not exposed to sound are definitely avoided in this way.
- a retaining ring (7) is screwed onto the sound-emitting cone (5), which is used to insert the ultrasonic vibrator into a liquid container.
- This retaining ring can be welded into the ultrasonic container or otherwise attached to it so that the sound-emitting cone (5) protrudes into the liquid.
- Fig. 2 shows the same transducer inserted in a sleeve (8).
- the same fastening of the sound-emitting cone (5) can be found by means of a comprehensive retaining ring (17), which in this illustration is integrally connected to the bushing (8).
- the bushing (8) encloses the entire remaining part of the ultrasonic vibrator and is closed on the underside by a base (9) with a screw connection (10).
- the screw connection (10) not only feeds the leads to the ultrasonic vibrator, it also fixes the entire ultrasonic vibrator to the inside of the container with the interposition of a seal.
- the transducer can also be easily replaced.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Surgical Instruments (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
- Gloves (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum Einleiten von Ultraschallschwingungen in eine Flüssigkeit mittels Ultraschallschwingern, die am Boden (der Wandung) eines Flüssigkeitsbehälters angeordnet sind und als lambda/2-Schwinger aus zwei im Gegentakt schwingenden piezoelektrischen Platten bestehen, die einer seits mit einem schallabstrahlenden Kegel und andererseits mit einem Gegengewicht verbunden sind.The invention relates to a device for introducing ultrasonic vibrations into a liquid by means of ultrasonic vibrators, which are arranged on the bottom (of the wall) of a liquid container and, as a lambda / 2 vibrator, consist of two piezoelectric plates oscillating in push-pull, one of which are connected on the one hand with a sound-emitting cone and on the other hand with a counterweight.
Derartige Vorrichtungen werden insbesondere bei der Ultraschallreinigung benötigt, wobei die in einem ultraschallerregten Flüssigkeitsbad auftretenden hohen Zug- und Druckkräfte, insbesondere der Mechanismus der Kavitation, eine sehr gute Reinigung der eingetauchten Werkstücke bewirken. Das Einleiten der Ultraschallschwingungen wird bei bekannten Vorrichtungen dieser Art dadurch bewirkt, daß die Ultraschallschwinger mit ihrem schallabstrahlenden Kegel auf eine Wandung beziehungsweise den Boden eines solchen Flüssigkeitsbehälters aufgeklebt werden und dadurch diese Wandung beziehungsweise den Boden in Schwingungen versetzen, die (der) wiederum diese Schwingungen an die Flüssigkeit weitergibt. Derartige Reinigungsbäder haben sich insbesondere für kompliziert geformte Werkstücke bewährt, werden jedoch auch mit Vorteil bei feinmechanischen Aggregaten angewendet.Devices of this type are required in particular for ultrasonic cleaning, the high tensile and compressive forces occurring in an ultrasound-excited liquid bath, in particular the mechanism of cavitation, effecting very good cleaning of the immersed workpieces. The introduction of the ultrasonic vibrations is effected in known devices of this type in that the ultrasonic vibrators are glued with their sound-emitting cone onto a wall or the bottom of such a liquid container and thereby set this wall or the bottom into vibrations which in turn apply these vibrations the liquid passes on. Such cleaning baths have proven particularly useful for workpieces of complex shapes, but are also used with advantage in precision mechanical units.
Die zu reinigenden Werkstücke beziehungsweise die Werkstücke, auf die die Ultraschallschwingungen einwirken sollen, werden hierbei nur eine kurze Zeitdauer diesen Ultraschallschwingungen ausgesetzt. Die Kavitationswirkung ist daher durch diese Zeitdauer dosierbar. Dies trifft jedoch nicht für die Wandung des Flüssigkeitsbehälters zu, die steter Kavitationswirkung ausgesetzt ist. Hierdurch kommt es zu einem "Kavitationslochfraß", der dazu führt, daß nach einiger Zeit die Behälterwandung undicht wird. Der Kavitationslochfraß macht sich selbstverständlich insbesondere an der Wandung bemerkbar, an der der Ultraschallgeber aufgesetzt ist. Diese Wandung wirkt als schallübertragende Membrane, muß also die gesamten Kräfte, die letztendlich auch zu der Kavitation führen, übertragen. Wird diese Membrane jedoch undicht, gelangt Feuchtigkeit zu den auf die Wandung aufgeklebten Ultraschallgebern, womit ein Lösen dieser Ultraschallschwinger und damit eine Zerstörung der Anlage verbunden ist. Eine dickere Membrane, die diesen Kavitationslochfraß hinauszögern würde, ist nicht einsetzbar, da mit der Dicke der Membrane die abgegebene Schalleistung beziehungsweise der Wirkungsgrad der gesamten Einrichtung deutlich zurückgeht.The workpieces to be cleaned or the workpieces on which the ultrasonic vibrations are supposed to act are only exposed to these ultrasonic vibrations for a short period of time. The cavitation effect can therefore be metered through this period. However, this does not apply to the wall of the liquid container, which is constantly exposed to cavitation. This leads to "cavitation pitting", which leads to the container wall becoming leaky after some time. The cavitation pitting is of course particularly noticeable on the wall on which the ultrasound transmitter is attached. This wall acts as a sound-transmitting membrane, so it must transmit all the forces that ultimately lead to cavitation. However, if this membrane leaks, moisture reaches the ultrasound transducers glued to the wall, which loosens these ultrasound transducers and thus destroys the system. A thicker membrane, which would delay this cavitation pitting, cannot be used, since with the thickness of the membrane, the sound output or the efficiency of the entire device decreases significantly.
Aufgabe der Erfindung ist es, eine Vorrichtung anzugeben, die diesen Kaviationslochfraß an den Flüssigkeitsbehälter-Wandungen beziehungsweise der Membrane vermeidet. Erreicht wird dies in erfindungsgemäßer Weise dadurch, daß die Ultraschallschwinger mittels eines Halterings gehalten sind, der nahe der piezoelektrischen Platte mit dem schallabstrahlenden Kegel verbunden ist und daß sie mittels dieses Halterings direkt oder über eine das Gegengewicht umgebenden Büchse in den Flüssigkeitsbehälter eingefügt sind.The object of the invention is to provide a device which avoids this cavitation pitting on the liquid container walls or the membrane. This is achieved in the manner according to the invention in that the ultrasonic vibrators are held by means of a retaining ring which is connected near the piezoelectric plate to the sound-emitting cone and that they are held by means of this retaining ring are inserted into the liquid container directly or via a sleeve surrounding the counterweight.
Nicht mehr also wie bisher werden die Ultraschallgeber mit ihrem schallabstrahlenden Kegel auf eine Wandung, die Membrane, des Flüssigkeitsbehälters aufgeklebt, sondern sie werden so in den Flüssigkeitsbehälter eingefügt, daß der schallabstrahlende Kegel direkt in die Flüssigkeit hineinragt. Die sich dann selbstverständlich auch einstellende Kavitation wird nunmehr nicht die Membrane beziehungsweise die Wandung des Flüssigkeitsbehälters abtragen, sondern den schallabstrahlenden Kegel. Der schallabstrahlende Kegel besteht jedoch aus massivem Metall, so daß der durch die Kavitation bewirkte Abtrag am schallabstrahlenden Kegel in der Praxis vernachlässigbar ist. Möglich ist diese besondere Halterung des Ultraschallgebers dadurch, daß sich bei den piezoelektrischen Platten ein Schwingungs-Knotenpunkt bildet mit der Schwingungsamplitude null; die maximale Schwingungsamplitude ergibt sich an der Stirnfläche des schallabstrahlenden Kegels. Wird der Haltering, wie nach der Erfindung angegeben, am Fußpunkt des schallabstrahlenden Kegels, dort wo er an der piezoelektrischen Platte anliegt, angebracht, so liegt dieser Haltering noch in der Nähe des Knotenpunktes, also an einer Stelle, wo der schallabstrahlende Kegel nur mit ge ringer Schwingungsamplitude schwingt. Dieser Haltering wird dadurch zwar auch noch zum Schwingen angeregt, jedoch mit einer ganz geringfügigen Amplitude, so daß dort auch kaum Kaviationseinwirkungen zu befürchten sind. Die erwünschte Schallübertragung an die Flüssigkeit jedoch wird praktisch nicht beeinträchtigt, da diese nun direkt über den schallabstrahlenden Kegel erfolgt.No longer, as before, are the ultrasonic transmitters with their sound-emitting cone glued to a wall, the membrane, of the liquid container, but they are inserted into the liquid container so that the sound-emitting cone protrudes directly into the liquid. The cavitation that then naturally occurs will now not remove the membrane or the wall of the liquid container, but the sound-emitting cone. However, the sound-emitting cone is made of solid metal, so that the abrasion caused by the cavitation on the sound-emitting cone is negligible in practice. This special mounting of the ultrasound transmitter is possible in that an oscillation node is formed in the piezoelectric plates with the oscillation amplitude zero; the maximum vibration amplitude results from the front surface of the sound-emitting cone. If, as stated according to the invention, the retaining ring is attached to the base of the sound-emitting cone, where it lies against the piezoelectric plate, then this retaining ring is still close to the node, i.e. at a point where the sound-emitting cone is only with ge ringer vibration amplitude vibrates. This retaining ring is thereby also caused to vibrate, but with a very slight amplitude, so that there is hardly any fear of cavitation. However, the desired sound transmission to the liquid is practically not impaired, since this now takes place directly via the sound-emitting cone.
Da auf diesen schallabstrahlenden Kegel nicht nur die Kavitation einwirkt, sondern auch die möglicherweise in der Flüssigkeit vorhandenen korrodierenden Chemikalien, wird nach der Erfindung weiterhin vorgeschlagen, daß der schallabstrahlende Kegel aus korrosionsfestem Material ist.Since not only cavitation acts on this sound-emitting cone, but also the corrosive chemicals possibly present in the liquid, it is further proposed according to the invention that the sound-emitting cone is made of corrosion-resistant material.
Eingefügt werden kann der Ultraschallgeber in erfindungsgemäßer Weise dadurch, daß der schallabstrahlende Kegel, wie nach der Erfindung vorgeschrieben, nahe der piezoelektrischen Platte in die Behälterwandung, die dann als "Halterung" dient, eingefügt beziehungsweise an dieser Stelle mit der Behälterwandung verschweißt wird. Selbstverständlich kann auch ein bereits mit dem schallabstrahlenden Kegel verschweißter Haltering in die Behälterwandung, als Teil dieser Wandung, eingeschweißt werden. Hierbei kann auch der Haltering einstückig mit dem schallabstrahlenden Kegel sein.The ultrasonic transducer can be inserted in the manner according to the invention in that the sound-emitting cone, as prescribed by the invention, is inserted near the piezoelectric plate into the container wall, which then serves as a "holder", or is welded to the container wall at this point. Of course, a retaining ring that has already been welded to the sound-emitting cone can also be welded into the container wall, as part of this wall. Here, the retaining ring can also be made in one piece with the sound-emitting cone.
Die weitere Möglichkeit, die allerdings etwas raumaufwendiger ist, ist durch die Erfindung dadurch gegeben, daß das Gegengewicht von einer Büchse umgeben ist, die durch einen Boden unterseitig bis auf eine Öffnung für die Schwingerzuleitungen verschlossen werden kann. Dadurch ist eine Vorrichtung gegeben, die durch eine bodenseitig abdichtende Schraubverbindung auf die Innenwandung des Flüsigkeitsbehälters aufgeschraubt werden kann, wodurch also der gesamte Ultraschallschwinger sich abgedichtet in der Flüssigkeit befindet und unmittelbar auf die Flüssigkeit einwirken kann. Diese Vorrichtung hat zudem noch den Vorteil, daß bei Ausfall eines Ultraschallschwingers ein Austausch dieses Schwingers unschwer möglich ist..The other possibility, which is somewhat more space-consuming, is given by the invention in that the counterweight is surrounded by a sleeve which can be closed by a bottom on the underside except for an opening for the transducer feed lines. This provides a device that can be screwed onto the inner wall of the liquid container by a screw connection that seals at the bottom, so that the entire ultrasonic oscillator is sealed in the liquid and can act directly on the liquid. This device also has the advantage that if one of the ultrasonic transducers fails, this transducer can be easily replaced.
Mit der Kapselung des gesamten Ultraschallgebers ist jedoch noch ein weiterer Vorteil verbunden. Es ist jetzt nämlich möglich, die in den Flüssigkeitsbehälter hineinragenden schallabstrahlenden Kegel unterschiedlich weit in den Flüssigkeitsbehälter hineinragen zu lassen, wodurch die Ausbildung stehender Wellen in der Flüssigkeit vermieden wird. Dies insbesondere dann, wenn einem weiteren Erfindungsmerkmal nach die Stirnflächen der schallabstrahlenden Kegel jeweils mit einer Differenz von lambda/4 in die Flüssigkeit eintauchen. "Tote Zonen", die nicht beschallt werden, werden auf diese Art und Weise mit Sicherheit vermieden.Encapsulating the entire ultrasonic transducer has yet another advantage. It is now possible to let the sound-emitting cones protrude into the liquid container to different extents, thereby preventing standing waves from forming in the liquid. This is particularly the case if, according to a further feature of the invention, the end faces of the sound-emitting cones are each immersed in the liquid with a difference of lambda / 4. "Dead zones" that are not exposed to sound are definitely avoided in this way.
Auf der Zeichnung sind Ausführungsbeispiele der erfindungsgemäßen Vorrichtung dargestellt, und zwar zeigen:
- Fig. 1 einen Ultraschallschwinger mit Haltering im Schnitt und
- Fig. 2 einen Ultraschallschwinger mit Büchse.
- Fig. 1 shows an ultrasonic transducer with a retaining ring in section and
- Fig. 2 shows an ultrasonic transducer with a sleeve.
Der Ultraschallgeber nach Fig. 1 besteht aus den beiden im Gegentakt schwingenden piezoelektrischen Platten (1, 2), zwischen denen eine Elektrode (3) als Spannungszuführung eingefügt ist. An die beiden piezoelektrischen Platten (1, 2) schließen sich einerseits ein Gegengewicht (4) und andererseits ein schallabstrahlender Kegel (5) an. Mittels einer Schraube (6) sind alle diese Teile zusammengehalten.1 consists of the two push-pull piezoelectric plates (1, 2), between which an electrode (3) is inserted as a voltage supply. On the one hand, a counterweight (4) and, on the other hand, a sound-emitting cone (5) adjoin the two piezoelectric plates (1, 2). All these parts are held together by means of a screw (6).
Nahe der Auflagefläche des schallabstrahlenden Kegels (5) an die piezoelektrische Platte (2) ist an den schallabstrahlenden Kegel (5) ein Haltering (7) angedreht, der zum Einfügen des Ultraschallschwingers in einen Flüssigkeitsbehälter dient. Dieser Haltering kann in den Ultraschallbehälter eingeschweißt oder sonstwie an ihn angebracht werden so, daß der schallabstrahlende Kegel (5) in die Flüssigkeit hineinragt. Selbstverständlich ist es auch möglich, die Behälterwandung mit einer solchen Öffnung zu versehen, die ein Einschweißen entsprechend der Verbindung durch den Haltering (7) erlaubt.Near the bearing surface of the sound-emitting cone (5) on the piezoelectric plate (2), a retaining ring (7) is screwed onto the sound-emitting cone (5), which is used to insert the ultrasonic vibrator into a liquid container. This retaining ring can be welded into the ultrasonic container or otherwise attached to it so that the sound-emitting cone (5) protrudes into the liquid. Of course, it is also possible to provide the container wall with such an opening, which allows welding according to the connection by the retaining ring (7).
Fig. 2 zeigt den gleichen Schwinger, eingefügt in eine Büchse (8). Auch hier findet sich wieder die gleiche Befestigung des schallabstrahlenden Kegels (5) mittels eines umfassenden Halteringes (17), der bei dieser Darstellung einstückig mit der Büchse (8) verbunden ist. Die Büchse (8) umschließt den gesamten restlichen Teil des Ultraschallschwingers und ist unterseitig durch einen Boden (9) mit Schraubstutzen (10) abgeschlossen. Durch den Schraubstutzen (10) werden nicht nur die Zuleitungen zu dem Ultraschallschwinger hindurchgeführt, sondern es wird damit auch der gesamte Ultraschallschwinger an einer Behälterinnenwandung unter Zwischenlage einer Dichtung befestigt. Dadurch ist nicht nur der empfindliche Schwingerteil vollkommen gegen Eindringen von Flüssigkeit geschützt, sondern auch ein Auswechseln des Schwingers unschwer möglich.Fig. 2 shows the same transducer inserted in a sleeve (8). Here, too, the same fastening of the sound-emitting cone (5) can be found by means of a comprehensive retaining ring (17), which in this illustration is integrally connected to the bushing (8). The bushing (8) encloses the entire remaining part of the ultrasonic vibrator and is closed on the underside by a base (9) with a screw connection (10). The screw connection (10) not only feeds the leads to the ultrasonic vibrator, it also fixes the entire ultrasonic vibrator to the inside of the container with the interposition of a seal. As a result, not only is the sensitive part of the transducer completely protected against the ingress of liquid, but the transducer can also be easily replaced.
Claims (8)
dadurch gekennzeichnet,
daß die Ultraschallgeber mittels eines Halteringes (7) gehalten sind, der nahe der piezoelektrischen Platte (2) mit dem schallabstrahlenden Kegel (5) verbunden ist und daß sie mittels dieses Halterings (7) direkt oder über eine das Gegengewicht (4) umgebenden Büchse (8) in den Flüssigkeitsbehälter eingefügt sind.1. Device for introducing ultrasonic vibrations into a liquid by means of ultrasonic sensors, which are arranged on the bottom (the wall) of a liquid container and as a lambda / 2 oscillator two push-pull piezoelectric plates, which are connected on the one hand to a sound-emitting cone and on the other hand to a counterweight,
characterized,
that the ultrasound transmitters are held by means of a retaining ring (7) which is connected to the sound-radiating cone (5) near the piezoelectric plate (2) and that they are held by means of this retaining ring (7) directly or via a bushing (4) surrounding the counterweight (4) 8) are inserted into the liquid container.
dadurch gekennzeichnet,
daß der schallabstrahlenden Kegel (5) aus korrosionsfestem Material ist.2. Device according to claim 1,
characterized,
that the sound-emitting cone (5) is made of corrosion-resistant material.
dadurch gekennzeichnet,
daß der Haltering (7) die Flüssigkeitsbehälter-Wandung ist.3. Device according to claim 1,
characterized,
that the retaining ring (7) is the liquid container wall.
dadurch gekennzeichnet,
daß der Haltering (7) einstückig mit dem schallabstrahlenden Kegel (5) verbunden ist.4. The device according to claim 1,
characterized,
that the retaining ring (7) is integrally connected to the sound-radiating cone (5).
dadurch gekennzeichnet,
daß die Büchse (8) einstückig mit dem Haltering (7) verbunden ist.5. The device according to claim 4,
characterized,
that the sleeve (8) is integrally connected to the retaining ring (7).
dadurch gekennzeichnet,
daß die Büchse (8) durch einen Boden (9) unterseitig bis auf eine Öffnung für die Zuleitungen verschlossen ist.6. The device according to one or more of the preceding claims,
characterized,
that the sleeve (8) is closed by a bottom (9) on the underside except for an opening for the feed lines.
dadurch gekennzeichnet,
daß an der Büchse (8) bodenseitig abdichtende Schraubverbindungen (10) angebracht sind.7. The device according to claim 6,
characterized,
that screw connections (10) are attached to the bottom of the bushing (8).
dadurch gekennzeichnet,
daß die Ultraschallgeber so in den Füssigkeitsbehälter eingefügt sind, daß die Stirnflächen der schallabstrahlenden Kegel (5) mit dem Abstand von lambda/4 in die Flüssigkeit eintauchen.8. The device according to claim 1,
characterized,
that the ultrasound transmitters are inserted into the liquid container so that the end faces of the sound-emitting cones (5) are immersed in the liquid at a distance of lambda / 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT89108097T ATE93752T1 (en) | 1988-05-14 | 1989-05-05 | ULTRASONIC DEVICE. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3816567A DE3816567A1 (en) | 1988-05-14 | 1988-05-14 | ULTRASONIC DEVICE |
| DE3816567 | 1988-05-14 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0342446A2 true EP0342446A2 (en) | 1989-11-23 |
| EP0342446A3 EP0342446A3 (en) | 1990-08-22 |
| EP0342446B1 EP0342446B1 (en) | 1993-09-01 |
Family
ID=6354419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89108097A Expired - Lifetime EP0342446B1 (en) | 1988-05-14 | 1989-05-05 | Ultrasonic device |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0342446B1 (en) |
| AT (1) | ATE93752T1 (en) |
| DE (2) | DE3816567A1 (en) |
| ES (1) | ES2045244T3 (en) |
| FI (1) | FI99090C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0449008A2 (en) * | 1990-03-28 | 1991-10-02 | United Kingdom Atomic Energy Authority | Sonochemical apparatus |
| CN103464360A (en) * | 2013-09-22 | 2013-12-25 | 江苏三恒科技股份有限公司 | Ultrasonic transducer for far distance measurement applied to coal mine environment |
| WO2016097513A1 (en) | 2014-12-15 | 2016-06-23 | Cedrat Technologies | Modular, submersible ultrasonic tubular transducer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1129615A (en) * | 1955-07-29 | 1957-01-23 | Realisations Ultrasoniques Sa | Device for transmitting elastic waves from a solid medium to a liquid medium |
| US2910390A (en) * | 1956-06-29 | 1959-10-27 | Hermes Sonic Corp | Machine for cleaning small parts |
| US3331589A (en) * | 1965-02-08 | 1967-07-18 | Frederick G Hammitt | Vibratory unit with seal |
| US3885172A (en) * | 1971-12-01 | 1975-05-20 | Continental Can Co | Sonic transducer |
| US4031503A (en) * | 1974-08-30 | 1977-06-21 | Hokushin Electric Works, Ltd. | Anti-corrosion ultrasonic transducer |
| EP0341505A2 (en) * | 1988-05-10 | 1989-11-15 | Martin Walter Ultraschalltechnik GmbH | Ultrasonic device |
-
1988
- 1988-05-14 DE DE3816567A patent/DE3816567A1/en not_active Withdrawn
-
1989
- 1989-05-05 DE DE89108097T patent/DE58905416D1/en not_active Expired - Lifetime
- 1989-05-05 AT AT89108097T patent/ATE93752T1/en not_active IP Right Cessation
- 1989-05-05 ES ES89108097T patent/ES2045244T3/en not_active Expired - Lifetime
- 1989-05-05 EP EP89108097A patent/EP0342446B1/en not_active Expired - Lifetime
- 1989-05-11 FI FI892287A patent/FI99090C/en not_active IP Right Cessation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1129615A (en) * | 1955-07-29 | 1957-01-23 | Realisations Ultrasoniques Sa | Device for transmitting elastic waves from a solid medium to a liquid medium |
| US2910390A (en) * | 1956-06-29 | 1959-10-27 | Hermes Sonic Corp | Machine for cleaning small parts |
| US3331589A (en) * | 1965-02-08 | 1967-07-18 | Frederick G Hammitt | Vibratory unit with seal |
| US3885172A (en) * | 1971-12-01 | 1975-05-20 | Continental Can Co | Sonic transducer |
| US4031503A (en) * | 1974-08-30 | 1977-06-21 | Hokushin Electric Works, Ltd. | Anti-corrosion ultrasonic transducer |
| EP0341505A2 (en) * | 1988-05-10 | 1989-11-15 | Martin Walter Ultraschalltechnik GmbH | Ultrasonic device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0449008A2 (en) * | 1990-03-28 | 1991-10-02 | United Kingdom Atomic Energy Authority | Sonochemical apparatus |
| EP0449008A3 (en) * | 1990-03-28 | 1991-12-11 | United Kingdom Atomic Energy Authority | Sonochemical apparatus |
| US5658534A (en) * | 1990-03-28 | 1997-08-19 | Aea Technology Plc | Sonochemical apparatus |
| CN103464360A (en) * | 2013-09-22 | 2013-12-25 | 江苏三恒科技股份有限公司 | Ultrasonic transducer for far distance measurement applied to coal mine environment |
| WO2016097513A1 (en) | 2014-12-15 | 2016-06-23 | Cedrat Technologies | Modular, submersible ultrasonic tubular transducer |
| US10702889B2 (en) | 2014-12-15 | 2020-07-07 | Cedrat Technologies | Modular, submersible ultrasonic tubular transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3816567A1 (en) | 1989-11-16 |
| EP0342446B1 (en) | 1993-09-01 |
| ATE93752T1 (en) | 1993-09-15 |
| FI99090B (en) | 1997-06-30 |
| FI99090C (en) | 1997-10-10 |
| DE58905416D1 (en) | 1993-10-07 |
| EP0342446A3 (en) | 1990-08-22 |
| FI892287A (en) | 1989-11-15 |
| FI892287A0 (en) | 1989-05-11 |
| ES2045244T3 (en) | 1994-01-16 |
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