EP1633493B1 - Standing ultrasonic wave spraying arrangement - Google Patents
Standing ultrasonic wave spraying arrangement Download PDFInfo
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- EP1633493B1 EP1633493B1 EP04739475A EP04739475A EP1633493B1 EP 1633493 B1 EP1633493 B1 EP 1633493B1 EP 04739475 A EP04739475 A EP 04739475A EP 04739475 A EP04739475 A EP 04739475A EP 1633493 B1 EP1633493 B1 EP 1633493B1
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- European Patent Office
- Prior art keywords
- reflector
- sonotrode
- paint
- ultrasonic standing
- atomizer arrangement
- Prior art date
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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
Definitions
- the invention relates to an ultrasonic standing wave atomizer for generating a paint spray for painting a workpiece with at least one sonotrode, with a the at least one sonotrode oppositely arranged component, wherein during operation in the space between the at least one sonotrode and the component a standing Ultrasound field forms.
- the ultrasonic standing wave atomizer assembly is provided with at least one nozzle-shaped paint supply device, which is arranged perpendicular to the center axis of each sonotrode and introduces the paint at least one paint exit point for the atomization process in the intermediate space.
- paint coatings are applied in automotive bodies and similar large objects in a known manner by means of high-rotation atomizers, which produce a fine paint spray mist, which is usually applied by suitable additional measures, for example, in electrically conductive paints by electric field on the surface to be coated.
- the known Hochrotationszerstäubung has the following disadvantages, affecting both the product quality and the required manufacturing costs can affect.
- the atomization quality as well as the output is essentially determined by the shape and speed of the rotating bell, as the rotating part carrying out the paint is called.
- For the drive of the bell clean compressed air is required, which acts on a coupled to the bell air turbine. The cleaning of the compressed air causes additional effort.
- the so accelerated paint particles have a high initial velocity, which is on the surfaces to be coated, for example, on the body surface, impair their precise alignment, so that in this way a non-negligible amount past paint on the target surface.
- a method for atomizing liquids is known, inter alia, from DE 28 42 232 , In this case, an ultrasonic field between a transmitting transducer and a reflector is generated. The atomization is carried out by introducing a liquid jet into a pressure node area of a standing ultrasonic wave. For atomization of a combustible mixture of coal dust with heating oil and water for heating purposes, you can supply the combustion air through a supply line to the mixture and this also steer in a predeterminable direction.
- the rotating bell is replaced by linearly vibrating ultrasonic sonotrodes. This leads to an increase in the reliability or the lifetime of the atomizer.
- the paint droplets have a lower initial velocity in the ultrasonic standing wave sputtering than in the high-rotation sputtering, so that much less purified air is required to direct the paint spray to the body. This in turn causes on the one hand lower consumption of expensive cleaned as well as on the other hand on paint, as a result of the reduced air flow less paint passes by the body.
- the paint thus has no direct contact with the sputtering device, unlike the high-rotation sputtering in ultrasonic standing-wave sputtering, thereby avoiding any wear due to lack of abrasion.
- the Uitraschatt-StehweXen atomization takes place in the form of a spray cone with an oval cross-section. This can be advantageous in the painting of narrow parts.
- the sonotrode oppositely disposed component is a coaxially oriented reflector whose end face facing the sonotrode has a stepped offset and wherein the depth of the offset is a multiple of half the wavelength in the Sonotrode generated sound vibrations in air corresponds.
- the reflector is formed as a passive reflector, wherein it is preferably formed as a plate, in particular as a circular disk-shaped plate whose cross-section corresponds at least to that of the sonotrode used in the Ultraschallstehwellen atomizer.
- the thickness of the reflector also corresponds to a multiple of half the wavelength of the sound vibrations generated in the sonotrode, wherein the thickness of the reflector is at least 10 mm.
- the stepped offset is formed in the reflector below the horizontal center axis of the reflector in these, wherein the indentation may have wedge shape to semicircular shape.
- the step-shaped offset in the reflector is semicircular or sector-shaped with symmetrically widening in direction of spraying opening in the sonotrode opposite end face of the reflector is formed. That is, the sector-like formed in the end face of the reflector step-shaped offset may have an opening angle ⁇ of 45 ° ⁇ ⁇ 180 °, preferably the sector-like formed in the end face of the reflector step-shaped offset has an opening angle ⁇ of 135 °.
- FIG. 1 shows a schematic side view of a first paint spray arrangement 10 with a sonotrode 12 with a uniformly formed passive reflector 14, between which a standing wave is generated by the vibrations generated in the sonotrode 22 and emerging from the reflector 14 facing end face 16 individual, here not shown, Schallschnellebäuchen, dip into each of which Lackzubowrschreibchen 18 and the intended paint application paint, which forms in the form of a widening spray direction spray cone 19 and thus causes a corresponding coverage of the workpiece to be coated with paint.
- FIG. 2 shows a schematic side view of a second paint spray arrangement 20 with a sonotrode 22, as has already been shown and described in FIG. 1, and with a stepped passive reflector 24 shown here in longitudinal section AB in accordance with the illustrations in FIGS. 3 to 5 , between which by the generated in the sonotrode 22 and from the reflector facing end surface 26 exiting vibrations a standing wave with individual, not shown here Schallschnellebäuchen is generated, in which also paint supply tube 18 immerse and provide the intended paint application paint, which is in Form of a widening in spray direction spray cone 19 forms and thus causes a corresponding coverage of the workpiece to be coated with paint.
- the reflector 24 used here has a reaching from its bottom to the horizontal center line indentation 28, which may be different, according to the variants shown in FIGS. 3 to 5 designed.
- the depth of the indentation 28 in this case is an arbitrary multiple of half the wavelength ⁇ of the switching oscillation in air.
- Fig. 4 the end face view of a second stepped reflector 24.2 is shown, in which the indentation 28.2 wedge-shaped from the center of the circular reflector 24.2 extends downward with an opening angle 90 ° ⁇ ⁇ 180 °.
- a third stepped reflector 24.3 is shown, which is formed as a rectangular, that is square, plate and also has a wedge-shaped from the center downwardly widening indentation 28.3, the opening angle similar to that shown in Fig. 4 Opening angle 90 ° ⁇ ⁇ 180 ° is provided.
- the purpose of the indentation 28 of the reflector 24.1, 24.2 and 24.3 according to the invention is to unnecessarily reduce the amount of paint which can be applied to the respective spraying device as a result of geometry-induced obstruction in the area of the reflector.
- the indentations 28.1 to 28.3 according to the invention it is now ensured that on the one hand the standing wave field between sonotrode and reflector is not weakened due to phase inequality of standing waves and on the other hand with the indentation a relatively large opening for the paint outlet from the Zerstäubungsraum is created.
- the round or angular reflector may also have steps in the form of circular sections, circular segments and circular sectors, the number of molded steps, the step height or depth and the position of the paint delivery tubes with respect to the segmented reflector depending on the application in terms of maximum paint rate criteria, low risk of wetting, shaping of the Lacksprühkegels or cheapest electrostatic charge can be selected.
- the reflector can be additionally provided with an air cushion.
- the extended opening has the advantage that when electrostatic charging in the vicinity of the paint fins relatively high electric field strengths ⁇ 25 kV / cm are possible because the field-shielding effect of the reflector is reduced.
Description
Die Erfindung betrifft eine Ultraschall-Stehwellen-Zerstäuberanordnung zur Erzeugung eines Lack-Sprühnebels zum Lackieren eines Werkstückes mit wenigstens einer Sonotrode, mit einem der wenigstens einen Sonotrode gegenüberliegend angeordneten Bauteil, wobei sich beim Betrieb im Zwischenraum zwischen der wenigstens einen Sonotrode und dem Bauteil ein stehendes Ultraschallfeld ausbildet. Darüber hinaus ist die Ultraschall-Stehwellen-Zerstäuberanordnung mit wenigstens einer düsenförmigen Lackzufuhrvorrichtung versehen, die senkrecht zur Mittelachse jeder Sonotrode angeordnet ist und den Lack an wenigstens einer Lackaustrittsstelle für den Zerstäubungsvorgang in den Zwischenraum einbringt.The invention relates to an ultrasonic standing wave atomizer for generating a paint spray for painting a workpiece with at least one sonotrode, with a the at least one sonotrode oppositely arranged component, wherein during operation in the space between the at least one sonotrode and the component a standing Ultrasound field forms. In addition, the ultrasonic standing wave atomizer assembly is provided with at least one nozzle-shaped paint supply device, which is arranged perpendicular to the center axis of each sonotrode and introduces the paint at least one paint exit point for the atomization process in the intermediate space.
Seither werden Lackanstriche bei Automobilkarosserien und ähnlichen großflächigen Gegenständen in bekannter Weise mittels Hochrotationszerstäubern aufgebracht, weiche einen feinen Lacksprühnebel erzeugen, der üblicherweise durch geeignete Zusatzmaßnahmen, zum Beispiel bei elektrisch leitfähigen Lacken mittels elektrischem Feld, auf die zu beschichtende Oberfläche appliziert wird.Since then paint coatings are applied in automotive bodies and similar large objects in a known manner by means of high-rotation atomizers, which produce a fine paint spray mist, which is usually applied by suitable additional measures, for example, in electrically conductive paints by electric field on the surface to be coated.
Dabei werden bei der Verwendung von umweltfreundlichem wasserlöslichen Basislack Lackraten von 200 ml/mm - 400 ml/mm und größer erzielt. Die für die Beschichtung geforderte Qualität, wie Ebenheit der Oberfläche und Vermeidung von Blasen, wird insbesondere dadurch erreicht, daß die Durchmesser der Lacktropfen des Sprühnebels im Bereich von 10 µm < dTropfen <60 µm liegen.In this case, when using environmentally friendly water-soluble base coat paint rates of 200 ml / mm - 400 ml / mm and greater are achieved. The quality required for the coating, such as flatness of the surface and avoidance of bubbles, is achieved in particular by the diameter of the drops of the spray spray being in the range of 10 μm <d drops <60 μm.
Die bekannte Hochrotationszerstäubung ist mit folgenden Nachteilen behaftet, die sich sowohl auf die Produktqualität als auch auf den erforderlichen Herstellaufwand auswirken können. Die Zerstäubungsqualität sowie die Ausbringung wird wesentlich bestimmt durch die Form und Drehzahl der rotierenden Glocke, wie das den Lack ausbringende Rotationsteil bezeichnet wird. Für den Antrieb der Glocke ist gereinigte Druckluft erforderlich, welche eine mit der Glocke gekoppelte Luftturbine beaufschlagt. Die Reinigung der Druckluft verursacht zusätzlichen Aufwand.The known Hochrotationszerstäubung has the following disadvantages, affecting both the product quality and the required manufacturing costs can affect. The atomization quality as well as the output is essentially determined by the shape and speed of the rotating bell, as the rotating part carrying out the paint is called. For the drive of the bell clean compressed air is required, which acts on a coupled to the bell air turbine. The cleaning of the compressed air causes additional effort.
Infolge der mit ca. 100.000 min-1 sehr hohen Drehzahl der Rotationszerstäuber haben die so beschleunigten Lackpartikel eine hohe Anfangsgeschwindigkeit, wodurch deren exakte Ausrichtung auf die zu beschichtenden Flächen, zum Beispiel auf die Karosserieoberfläche, beeinträchtigt ist, so dass hierdurch eine nicht zu vernachlässigende Menge an Lack an der Zielfläche vorbeifliegt.As a result of about 100,000 min -1 very high rotational speed of the rotary atomizer, the so accelerated paint particles have a high initial velocity, which is on the surfaces to be coated, for example, on the body surface, impair their precise alignment, so that in this way a non-negligible amount past paint on the target surface.
Darüber hinaus ist die ausbringbare Menge an Lack pro Zeiteinheit beim Auftrag mittels Hochrotationszerstäubern limitiert, was wiederum den erforderlichen Zeitaufwand für den Lackauftrag erhöht.In addition, the ausbringbare amount of paint per unit time is limited by order Hochrotationszerstäubern, which in turn increases the time required for the paint job.
Ein Verfahren zum Zerstäuben von Flüssigkeiten ist unter anderem bekannt aus der
Aus der
Die rotierende Glocke wird hierbei durch linear schwingende Ultraschallsonotroden ersetzt. Dies führt zu einer Erhöhung der Zuverlässigkeit beziehungsweise der Lebensdauer des Zerstäubers. Außerdem entfällt die wegen der erforderlichen Reinigung teure Antriebsluft für die Druckluftturbine. Auch haben die Lacktröpfchen bei der Ultraschall-Stehwellen-Zerstäubung eine geringere Anfangsgeschwindigkeit als bei der Hochrotationszerstäubung, so daß wesentlich weniger gereinigte Luft erforderlich ist, um den Lacksprühnebel zur Karosserie zu lenken. Dies wiederum bewirkt einerseits geringeren Verbrauch an teurer gereinigter als auch andererseits an Lack, da infolge der verminderten Luftströmung weniger Lack an der Karosserie vorbeifliegt.The rotating bell is replaced by linearly vibrating ultrasonic sonotrodes. This leads to an increase in the reliability or the lifetime of the atomizer. In addition, eliminates the expensive because of the necessary cleaning drive air for the compressed air turbine. The paint droplets have a lower initial velocity in the ultrasonic standing wave sputtering than in the high-rotation sputtering, so that much less purified air is required to direct the paint spray to the body. This in turn causes on the one hand lower consumption of expensive cleaned as well as on the other hand on paint, as a result of the reduced air flow less paint passes by the body.
Lediglich zum Schutz des Reflektors vor der Benetzung durch den Lack ist mehr teure Reinigungsluft als bei der Sonotrode erforderlich beziehungsweise, beziehungsweise es muß ein größerer Abstand des Reflektors zur Lamelle gewählt werden. Da die Sonotrode leichter vor Benetzung durch den Lack zu schützen ist als der Reflektor, weil die Lacktröpfchen durch die Schwingungen von der Sonotrode fern gehalten werden.Only to protect the reflector from wetting by the paint more expensive cleaning air than the sonotrode is required or, or it must be a greater distance of the reflector to the lamella are selected. Since the sonotrode is easier to protect against wetting by the paint than the reflector, because the paint droplets are kept away by the vibrations of the sonotrode.
Der Lack hat somit anders als bei der Hochrotationszerstäubung bei der Ultraschallstehwellen-Zerstäubung keinen direkten Kontakt zu der Zerstäubungseinrictitung, wodurch jeglicher Verschleiß infolge fehlendem Abrieb vermieden wird. Üblicherweise erfolgt bei der Uitraschatt-StehweXen-Zerstäubung der Lackauftrag in Form eines Sprühkegels mit ovalem Querschnitt. Dies kann vorteilhaft sein bei der Lackierung schmaler Teile.The paint thus has no direct contact with the sputtering device, unlike the high-rotation sputtering in ultrasonic standing-wave sputtering, thereby avoiding any wear due to lack of abrasion. Normally, the Uitraschatt-StehweXen atomization takes place in the form of a spray cone with an oval cross-section. This can be advantageous in the painting of narrow parts.
Die Gefahr der Benetzung wird auch verringert, wenn Sonotroden- und Reflektorstirnflächen gegeneinander geneigt sind, wodurch eine größere Öffnung für den Lackaustritt entsteht. Dies kann auch durch abgeschrägte Stirnflächen erreicht werden.The risk of wetting is also reduced when sonotrode and reflector end faces are inclined against each other, creating a larger opening for the paint outlet. This can also be achieved by tapered end faces.
Allerdings führen diese Maßnahmen dazu, daß das Ultraschallfeld im Zerstäubungsraum abgeschwächt wird. Dies wird dadurch hervorgerufen, daß die Schallwellen beziehungsweise ein gewisser Anteil nicht mehr nur hin- und zurückwandern, sondern zum Teil den Zerstäubungsraum verlassen. Dadurch wird die maximal zerstäubbare Lackrate reduziert.However, these measures cause the ultrasonic field in the atomization space to be weakened. This is caused by the fact that the sound waves or a certain proportion no longer only go back and forth, but partly leave the atomization space. This reduces the maximum sprayable paint rate.
Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, eine Anordnung der eingangs genannten Art anzugeben, welche bei einfacher Gestaltung eine möglichst große Öffnung für den Lackaustritt bietet, wobei das hierfür genutzte Schallfeld möglichst wenig geschwächt werden soll bei gleichzeitig möglichst unveränderter Lackrate, das heißt gleichzeitig möglichst unveränderter Ausbringung an Lack.Based on this prior art, it is an object of the invention to provide an arrangement of the type mentioned, which offers the largest possible opening for the paint outlet with a simple design, the sound field used for this purpose should be weakened as little as possible while unchanged paint rate, the means at the same time as unchanged as possible application of paint.
Zur Lösung dieser Aufgabe ist erfindungsgemäß entsprechend den Merkmalen des Anspruchs 1 vorgesehen, daß das der Sonotrode gegenüberliegend angeordnete Bauteil ein koaxial ausgerichteter Reflektor ist, dessen der Sonotrode zugewandte Stirnfläche einen stufenförmigen Versatz aufweist und wobei die Tiefe des Versatzes einem Vielfachen der halben Wellenlänge der in der Sonotrode erzeugten Schallschwingungen in Luft entspricht.To solve this problem according to the invention according to the features of claim 1 is provided that the sonotrode oppositely disposed component is a coaxially oriented reflector whose end face facing the sonotrode has a stepped offset and wherein the depth of the offset is a multiple of half the wavelength in the Sonotrode generated sound vibrations in air corresponds.
In vorteilhafter Weiterbildung der Erfindung ist der Reflektor als passiver Reflektor ausgebildet, wobei er vorzugsweise als Platte, insbesondere als kreisscheibenförmige Platte, ausgebildet ist, deren Querschnitt wenigstens dem der in der Ultraschallstehwellen-Zerstäuberanordnung eingesetzten Sonotrode entspricht.In an advantageous embodiment of the invention, the reflector is formed as a passive reflector, wherein it is preferably formed as a plate, in particular as a circular disk-shaped plate whose cross-section corresponds at least to that of the sonotrode used in the Ultraschallstehwellen atomizer.
Gemäß einer bevorzugten Ausführungsform der Erfindung erweist es sich als günstig, daß die Dicke des Reflektors ebenfalls einem Vielfachen der halben Wellenlänge der in der Sonotrode erzeugten Schallschwingungen entspricht, wobei die Dicke des Reflektors wenigstens 10 mm beträgt.According to a preferred embodiment of the invention, it proves to be favorable that the thickness of the reflector also corresponds to a multiple of half the wavelength of the sound vibrations generated in the sonotrode, wherein the thickness of the reflector is at least 10 mm.
Entsprechend einer Ausgestaltung der Erfindung ist der stufenförmige Versatz im Reflektor unterhalb der horizontalen Mittelachse des Reflektors in diesen eingeformt, wobei die Einformung Keilform bis Halbkreisform haben kann.According to one embodiment of the invention, the stepped offset is formed in the reflector below the horizontal center axis of the reflector in these, wherein the indentation may have wedge shape to semicircular shape.
Hieraus ergibt sich in Weiterbildung der Erfindung, daß der stufenförmige Versatz im Reflektor halbkreisförmig oder sektorartig mit sich in Sprührichtung symmetrisch erweiternder Öffnung in die der Sonotrode gegenüberliegende Stirnfläche des Reflektors eingeformt ist. Das heißt, daß der sektorartig in die Stirnfläche des Reflektors eingeformte stufenförmige Versatz einen Öffnungswinkel α von 45°<α<180° aufweisen kann, wobei vorzugsweise der sektorartig in die Stirnfläche des Reflektors eingeformte stufenförmige Versatz einen Öffnungswinkel α von 135° aufweist.It follows in a further development of the invention that the step-shaped offset in the reflector is semicircular or sector-shaped with symmetrically widening in direction of spraying opening in the sonotrode opposite end face of the reflector is formed. That is, the sector-like formed in the end face of the reflector step-shaped offset may have an opening angle α of 45 ° <α <180 °, preferably the sector-like formed in the end face of the reflector step-shaped offset has an opening angle α of 135 °.
Diese und weitere vorteilhafte Ausgestaltungen und Ausführungsformen sind Gegenstand der Unteransprüche.These and other advantageous embodiments and embodiments are Subject of the dependent claims.
Anhand eines in der beigefügten Zeichnung dargestellten Ausführungsbeispieles sollen die Erfindung, vorteilhafte Ausgestaltungen und Verbesserungen der Erfindung sowie deren besondere Vorteile näher erläutert und beschrieben werden.Reference to an embodiment shown in the accompanying drawings, the invention, advantageous refinements and improvements of the invention and their particular advantages to be explained and described in detail.
Es zeigen
- Fig. 1
- eine schematische Seitenansicht einer ersten Lacksprühanordnung mit einer Sonotrode mit einem gleichförmigen passiven Reflektor;
- Fig. 2
- eine schematische Seitenansicht einer zweiten Lacksprühanordnung mit einer Sonotrode mit einem abgestuften passiven Reflektor;
- Fig. 3
- eine Stirnflächenansicht eines ersten abgestuften Reflektors;
- Fig. 4
- eine Stirnflächenansicht eines zweiten abgestuften Reflektors und
- Fig. 5
- eine Stirnflächenansicht eines dritten abgestuften Reflektors.
- Fig. 1
- a schematic side view of a first paint spray assembly with a sonotrode with a uniform passive reflector;
- Fig. 2
- a schematic side view of a second paint spray assembly with a sonotrode with a graded passive reflector;
- Fig. 3
- an end face view of a first stepped reflector;
- Fig. 4
- an end face view of a second stepped reflector and
- Fig. 5
- an end view of a third stepped reflector.
In Fig. 1 ist eine schematische Seitenansicht einer ersten Lacksprühanordnung 10 mit einer Sonotrode 12 mit einem gleichförmig ausgebildeten passiven Reflektor 14 dargestellt, zwischen welchen durch die in der Sonotrode 22 erzeugten und aus deren dem Reflektor 14 zugewandten Stirnfläche 16 austretenden Schwingungen eine Stehwelle erzeugt wird mit einzelnen, hier nicht näher dargestellten Schallschnellebäuchen, in welche jeweils Lackzufuhrröhrchen 18 eintauchen und den zum Lackauftrag vorgesehenen Lack zuführen, der in Form eines sich in Sprührichtung erweiternden Sprühkegels 19 ausbildet und somit eine entsprechende Bedeckung des zu beschichtenden Werkstückes mit Lack bewirkt.1 shows a schematic side view of a first
Während die Schallaustrittsfläche der Sonotrode 12, das heißt deren Stirnfläche 16, infolge deren Schwingungszustand nicht der Gefahr einer dauerhaften Benetzung mit dem aufzubringenden Lack ausgesetzt ist, besteht dieses Problem sehr wohl beim Reflektor 14, auf dessen hiervon betroffene Stirnfläche der Pfeil P weist. Zur Unterbindung der Benetzung mit Lack beziehungsweise zu deren Minderung und zur Beseitigung des auftreffenden Lacks wird üblicherweise Druckluft verwendet, welche - hier nicht näher dargestellt - in Sprührichtung, zugeführt wird.While the sound exit surface of the
Fig. 2 zeigt eine schematische Seitenansicht einer zweiten Lacksprühanordnung 20 mit einer Sonotrode 22, wie sie auch in Fig. 1 bereits gezeigt und beschrieben ist sowie mit einem hier im Längsschnitt A-B entsprechend den Darstellungen in den Fig. 3 bis 5 gezeigten abgestuften passiven Reflektor 24, zwischen welchen durch die in der Sonotrode 22 erzeugten und aus deren dem Reflektor zugewandten Stirnfläche 26 austretenden Schwingungen eine Stehwelle mit einzelnen, hier nicht näher dargestellten Schallschnellebäuchen erzeugt wird, in welche ebenfalls Lackzufuhrröhrchen 18 eintauchen und den zum Lackauftrag vorgesehenen Lack zuführen, der sich in Form eines sich in Sprührichtung erweiternden Sprühkegels 19 ausbildet und somit eine entsprechende Bedeckung des zu beschichtenden Werkstückes mit Lack bewirkt.2 shows a schematic side view of a second paint spray arrangement 20 with a
Abweichend von der Geometrie des in Fig. 1 dargestellten Reflektors 14 weist der hier eingesetzte Reflektor 24 eine von seiner Unterseite bis zur horizontalen Mittellinie reichende Einformung 28 auf, welche unterschiedlich, entsprechend den in den Fig. 3 bis 5 gezeigten Varianten gestaltet sein kann. Die Tiefe der Einformung 28 beträgt hierbei ein beliebiges Vielfaches der halben Wellenlänge λ der Schaltschwingung in Luft.Notwithstanding the geometry of the
In Fig. 3 ist die der jeweiligen Sonotrode zugewandte Stirnflächenansicht eines ersten abgestuften Reflektors 24.1 gezeigt, bei welchem die Einformung 28.1 halbkreisförmig ausgebildet ist. Demgemäß erfolgt der Versatz der stirnseitigen Oberfläche des Reflektors 24.1 an der horizontalen Mittelinie mit einem Öffnungswinkel α= 180°.In Fig. 3, the respective sonotrode facing end face view of a first stepped reflector 24.1 is shown, in which the indentation 28.1 is semicircular. Accordingly, the offset of the front surface of the reflector 24.1 at the horizontal center line with an opening angle α = 180 °.
In Fig. 4 ist die Stirnflächenansicht eines zweiten abgestuften Reflektors 24.2 gezeigt, bei welchem die Einformung 28.2 keilförmig vom Zentrum des kreisförmigen Reflektors 24.2 sich nach unten erweitert mit einem Öffnungswinkel 90°< α < 180°.In Fig. 4, the end face view of a second stepped reflector 24.2 is shown, in which the indentation 28.2 wedge-shaped from the center of the circular reflector 24.2 extends downward with an opening angle 90 ° <α <180 °.
In Fig. 5 schließlich ist die Stirnflächenansicht eines dritten abgestuften Reflektors 24.3 gezeigt, welcher als rechteckförmige, das heißt hier quadratische, Platte ausgebildet ist und ebenfalls eine keilförmige vom Zentrum sich nach unten erweiternde Einformung 28.3 aufweist, deren Öffnungswinkel ähnlich dem in Fig. 4 gezeigten Öffnungswinkel 90° < α < 180° vorgesehen ist.In Fig. 5, finally, the end face view of a third stepped reflector 24.3 is shown, which is formed as a rectangular, that is square, plate and also has a wedge-shaped from the center downwardly widening indentation 28.3, the opening angle similar to that shown in Fig. 4 Opening angle 90 ° <α <180 ° is provided.
Zweck der erfindungsgemäßen Einformung 28 des Reflektors 24.1, 24.2 und 24.3 ist es, die mit der jeweiligen Sprühvorrichtung an sich ausbringbare Lackmenge nicht infolge geometriebedingter Behinderung im Bereich des Reflektors unnötigerweise zu verringern. Mit Hilfe der erfindungsgemäßen Einformungen 28.1 bis 28.3 ist nunmehr gewährleistet, daß einerseits das Stehwellefeld zwischen Sonotrode und Reflektor nicht infolge phasenungleichheit der Stehwellen geschwächt wird und andererseits mit der Einformung eine relativ große Öffnung für den Lackaustritt aus dem Zerstäubungsraum geschaffen ist.The purpose of the
Auch kann der runde oder eckige Reflektor Stufen in Form von Kreisabschnitten, Kreissegmenten und Kreissektoren aufweisen, wobei die Anzahl der eingeformten Stufen, deren Stufenhöhe beziehungsweise -tiefe und die Lage der Lackförderröhrchen in bezug auf den segmentierten Reflektor je nach Anwendung hinsichtlich der Kriterien maximale Lackrate, geringe Benetzungsgefahr, Formung des Lacksprühkegels oder günstigste elektrostatische Aufladung gewählt werden kann.The round or angular reflector may also have steps in the form of circular sections, circular segments and circular sectors, the number of molded steps, the step height or depth and the position of the paint delivery tubes with respect to the segmented reflector depending on the application in terms of maximum paint rate criteria, low risk of wetting, shaping of the Lacksprühkegels or cheapest electrostatic charge can be selected.
Bei Bedarf kann der Reflektor zusätzlich mit einem Luftpolster versehen werden.If required, the reflector can be additionally provided with an air cushion.
Überdies bietet die erweiterte Öffnung den Vorteil, daß bei elektrostatischer Aufladung in der Nähe der Lacklamellen relativ hohe elektrische Feldstärken <25 kV/cm möglich sind, weil die feldabschirmende Wirkung des Reflektors vermindert ist.Moreover, the extended opening has the advantage that when electrostatic charging in the vicinity of the paint fins relatively high electric field strengths <25 kV / cm are possible because the field-shielding effect of the reflector is reduced.
Claims (10)
- Ultrasonic standing-wave atomizer arrangement (10, 20) for producing a paint spray mist for painting a workpiece, with a sonotrode (12, 22), with a component (14, 24) arranged lying opposite the sonotrode (12, 22), a standing ultrasonic field being formed in the intermediate space between the at least one sonotrode (12, 22) and the component (14, 24) in the case of operation, and also with at least one nozzle-shaped paint feeding device (18), which is arranged perpendicularly in relation to the center axis of the sonotrode (12, 22) and introduces the paint into the intermediate space for the atomizing process at at least one paint discharge point, the component arranged lying opposite the sonotrode (22) being a coaxially aligned reflector (24), characterized in that one of the end faces of the reflector (24), facing the sonotrode (22), has a step-shaped recessed formation (28) and in that the depth of the recessed formation- (28) corresponds to a multiple of half the wavelength λ of the sonic vibrations in air that are produced in the sonotrode (22).
- Ultrasonic standing-wave atomizer arrangement according to Claim 1, characterized in that the reflector (24) is formed as a passive reflector.
- Ultrasonic standing-wave atomizer arrangement according to Claim 2, characterized in that the reflector (24) is formed as a circular disk-shaped plate or as a rectangular plate.
- Ultrasonic standing-wave atomizer arrangement according to Claim 3, characterized in that the thickness of the reflector (24) likewise corresponds to a multiple of half the wavelength of the sonic vibrations produced in the sonotrode.
- Ultrasonic standing-wave atomizer arrangement according to Claim 3 or 4, characterized in that the thickness of the reflector is at least 10 mm.
- Ultrasonic standing-wave atomizer arrangement according to one of Claims 1 to 5, characterized in that the step-shaped recessed formation (28) in the reflector (24) is formed in the latter below the horizontal center axis of the reflector (24).
- Ultrasonic standing-wave atomizer arrangement (10) according to Claim 6, characterized in that the step-shaped recessed formation (28) in the reflector (24) is formed in the end face of the reflector (24) lying opposite the sonotrode (22) in the form of a semicircle.
- Ultrasonic standing-wave atomizer arrangement (10) according to Claim 6, characterized in that the stepped-shaped recessed formation (28) in the reflector (24) is formed in the end face of the reflector (24) lying opposite the sonotrode in the manner of a sector, with an opening widening symmetrically in the spraying direction.
- Ultrasonic standing-wave atomizer arrangement (10) according to Claim 8, characterized in that the sector-like stepped-shaped recessed formation (28) in the end face of the reflector (24) has an angle of opening α of 45° < α < 180°.
- Ultrasonic standing-wave atomizer arrangement (10) according to Claim 9, characterized in that the sector-like step-shaped recessed formation (28) in the end face of the reflector (24) has an angle of opening α of 135°.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10327430A DE10327430A1 (en) | 2003-06-18 | 2003-06-18 | Ultrasonic standing-wave atomizer |
| PCT/EP2004/005864 WO2004110649A1 (en) | 2003-06-18 | 2004-05-29 | Standing ultrasonic wave spraying arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1633493A1 EP1633493A1 (en) | 2006-03-15 |
| EP1633493B1 true EP1633493B1 (en) | 2007-06-27 |
Family
ID=33495120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04739475A Expired - Fee Related EP1633493B1 (en) | 2003-06-18 | 2004-05-29 | Standing ultrasonic wave spraying arrangement |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7472850B2 (en) |
| EP (1) | EP1633493B1 (en) |
| JP (1) | JP2006527644A (en) |
| DE (2) | DE10327430A1 (en) |
| ES (1) | ES2288686T3 (en) |
| WO (1) | WO2004110649A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013102918A1 (en) | 2013-03-21 | 2014-09-25 | Tenneco Gmbh | ultrasonic evaporator |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005030209A1 (en) * | 2005-06-29 | 2007-01-04 | Robert Bosch Gmbh | Method for calibrating the internal dimensions of a particular annular body |
| WO2024013890A1 (en) * | 2022-07-13 | 2024-01-18 | 日産自動車株式会社 | Paint dispensing device and method for painting automobile using same |
Family Cites Families (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2842232C2 (en) * | 1978-09-28 | 1985-04-18 | Battelle-Institut E.V., 6000 Frankfurt | Method and device for atomizing liquids, suspensions and emulsions, agglomerated dusts or powders and mixtures thereof |
| DE2906823A1 (en) * | 1979-02-22 | 1980-09-04 | Battelle Institut E V | Ultrasonic vibrator with piezoelectric semicircular rings - which fit into circular slot around mechanical resonator with cavity in shape of piezoelectric elements |
| JPS58174842A (en) * | 1982-04-07 | 1983-10-13 | Toshiba Corp | Ultrasonic penetrating device |
| NL8202164A (en) * | 1982-05-27 | 1983-12-16 | Philips Nv | METHOD AND APPARATUS FOR TRANSPORTING AND DEPOSITING VISCOUS SUBSTANCES |
| JPS58190457U (en) * | 1982-06-10 | 1983-12-17 | 富士写真フイルム株式会社 | electrostatic painting equipment |
| EP0192383B1 (en) * | 1985-02-18 | 1990-12-05 | National Research Development Corporation | Method of distributing liquid onto a substrate |
| JPS636074U (en) * | 1986-06-27 | 1988-01-16 | ||
| JPS6338193A (en) * | 1986-08-01 | 1988-02-18 | Toa Nenryo Kogyo Kk | Ultrasonic vibrator horn |
| US4748043A (en) * | 1986-08-29 | 1988-05-31 | Minnesota Mining And Manufacturing Company | Electrospray coating process |
| DE3735787A1 (en) * | 1987-09-22 | 1989-03-30 | Stiftung Inst Fuer Werkstoffte | METHOD AND DEVICE FOR SPRAYING AT LEAST ONE JET OF A LIQUID, PREFERABLY MOLTED METAL |
| DE3732325A1 (en) * | 1987-09-25 | 1989-04-13 | Battelle Institut E V | DEVICE FOR SPRAYING A LIQUID MEDIUM WITH THE AID OF ULTRASOUND |
| DE3939178A1 (en) * | 1989-11-27 | 1991-05-29 | Branson Ultraschall | DEVICE FOR SPRAYING LIQUID AND SOLID MATERIALS, PREFERABLY MELTED METALS |
| US5387444A (en) * | 1992-02-27 | 1995-02-07 | Dymax Corporation | Ultrasonic method for coating workpieces, preferably using two-part compositions |
| DE4328088B4 (en) * | 1993-08-20 | 2005-05-25 | Artur Prof. Dr. Goldschmidt | Process for coating workpieces with organic coating materials |
| US7108894B2 (en) * | 1998-09-30 | 2006-09-19 | Optomec Design Company | Direct Write™ System |
| DE10059594A1 (en) * | 2000-11-30 | 2002-06-06 | Solarworld Ag | Method and device for producing globular grains from ultrapure silicon with diameters from 50 mum to 300 mum and their use |
| FR2821291B1 (en) * | 2001-02-27 | 2003-04-25 | Imaje Sa | PRINTHEAD AND PRINTER WITH IMPROVED DEFLECTION ELECTRODES |
| US6478754B1 (en) * | 2001-04-23 | 2002-11-12 | Advanced Medical Applications, Inc. | Ultrasonic method and device for wound treatment |
| JP4025055B2 (en) * | 2001-11-05 | 2007-12-19 | 独立行政法人理化学研究所 | Immobilization device |
| DE10245324A1 (en) | 2002-09-27 | 2004-04-08 | Abb Patent Gmbh | Method for atomizing paint coating materials, using an ultrasonic generator and reflector with a paint delivery tube having a deflector to prevent paint drops moving up the tube |
| DE10245326A1 (en) | 2002-09-27 | 2004-04-08 | Abb Patent Gmbh | A method for atomizing paint coating materials has an ultrasonic generator and reflector setting up standing waves maximized at the center |
| US7060319B2 (en) * | 2003-09-24 | 2006-06-13 | Boston Scientific Scimed, Inc. | method for using an ultrasonic nozzle to coat a medical appliance |
| US7083322B2 (en) * | 2003-12-01 | 2006-08-01 | The Boeing Company | Coating production systems and methods with ultrasonic dispersion and active cooling |
| US7296756B2 (en) * | 2005-05-23 | 2007-11-20 | Illinois Tool Works Inc. | Voltage block |
-
2003
- 2003-06-18 DE DE10327430A patent/DE10327430A1/en not_active Withdrawn
-
2004
- 2004-05-29 WO PCT/EP2004/005864 patent/WO2004110649A1/en active IP Right Grant
- 2004-05-29 DE DE502004004196T patent/DE502004004196D1/en not_active Expired - Fee Related
- 2004-05-29 JP JP2006515809A patent/JP2006527644A/en active Pending
- 2004-05-29 EP EP04739475A patent/EP1633493B1/en not_active Expired - Fee Related
- 2004-05-29 US US10/560,278 patent/US7472850B2/en not_active Expired - Fee Related
- 2004-05-29 ES ES04739475T patent/ES2288686T3/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013102918A1 (en) | 2013-03-21 | 2014-09-25 | Tenneco Gmbh | ultrasonic evaporator |
| DE102013102918B4 (en) * | 2013-03-21 | 2015-04-23 | Tenneco Gmbh | ultrasonic evaporator |
Also Published As
| Publication number | Publication date |
|---|---|
| US20070012797A1 (en) | 2007-01-18 |
| DE502004004196D1 (en) | 2007-08-09 |
| JP2006527644A (en) | 2006-12-07 |
| US7472850B2 (en) | 2009-01-06 |
| WO2004110649A1 (en) | 2004-12-23 |
| ES2288686T3 (en) | 2008-01-16 |
| EP1633493A1 (en) | 2006-03-15 |
| DE10327430A1 (en) | 2005-01-05 |
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