EP2029887B1 - Spray device for fluids - Google Patents

Spray device for fluids Download PDF

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Publication number
EP2029887B1
EP2029887B1 EP07727969A EP07727969A EP2029887B1 EP 2029887 B1 EP2029887 B1 EP 2029887B1 EP 07727969 A EP07727969 A EP 07727969A EP 07727969 A EP07727969 A EP 07727969A EP 2029887 B1 EP2029887 B1 EP 2029887B1
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EP
European Patent Office
Prior art keywords
shock
hifu
spray device
nozzle
wave
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Not-in-force
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EP07727969A
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German (de)
French (fr)
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EP2029887A1 (en
Inventor
Klaus Habr
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/041—Injectors peculiar thereto having vibrating means for atomizing the fuel, e.g. with sonic or ultrasonic vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means

Definitions

  • the invention relates to a spraying device for fluids.
  • a spraying device for fluids.
  • a spraying device is already known which discloses an actuator for generating shockwaves, which controls the fluid flow at the nozzle opening of a nozzle.
  • a one-piece actuator is provided in the known spray device.
  • Such an actuator is relatively expensive to produce depending on the shape of the nozzle, and the control of the fluid flow at the nozzle outlet can be influenced only to a relatively small extent.
  • the invention has the object, the known sprayer such that a more flexible control of the shock waves in the region of the nozzle outlet is made possible. At the same time a relatively simple production should be possible. This object is achieved in a spraying device or a method for operating a spraying device with the features of claims 1 and 11, respectively.
  • the generation of the shock waves preferably takes place with the aid of a piezoelectric element or a piezocomposite element which, for example, forms a wall section in the housing wall of the nozzle. At least two shockwave actuators are provided whose shockwaves intersect at the desired focusing point.
  • shock wave actuators which operate according to an electrohydraulic principle (radio discharge path) or according to an electrical / mechanical force conversion principle.
  • shock wave As an alternative to the shock wave principle, it is also possible to use piezo or piezocomposite elements or other fast actuators which operate according to the HIFU principle (High Intensity Focused Ultrasound).
  • the shock wave is replaced by a high-frequency ultrasound source.
  • the focus on the nozzle outlet can be carried out both directly and indirectly.
  • the shock wave propagation occurs directly between the shock wave actuator and the focusing point, with indirect propagation the shock wave is first reflected on at least one reflecting surface and then directed further in the direction of the focusing point.
  • the advantage of the indirect Propagation is in the greater structural design options for the arrangement of the shock wave actuator, so that, for example, very narrow-built sprayers can be realized.
  • the mass dosage per injection process is determined by the number of successive shock wave pulses.
  • Said spraying device can be used in various products.
  • all types of injection systems in particular injection systems in internal combustion engines such as diesel vehicles or gasoline vehicles, but also, for example, the injection of liquid solutions in the exhaust system of an internal combustion engine as exhaust aftertreatment (Ammoniakeindüsung).
  • Ammoniakeindüsung the injection of liquid solutions in the exhaust system of an internal combustion engine as exhaust aftertreatment
  • novel gasifier concepts in which such spraying can be used.
  • spraying device 1 is a fuel injection system for internal combustion engines.
  • the spraying device 1 comprises a nozzle 2, which is connected via a feed device 5, are introduced into the inlet bores 6, with a fluid reservoir 3.
  • the fluid in the fluid reservoir 3 is pressurized via a pressure generating unit 4 - exemplified as a pump P - which is in particular only a low pressure.
  • the nozzle housing 9 is funnel-shaped in the embodiment, at the tip of the nozzle housing is a nozzle outlet 8, which is to be opened and closed by a Venfilnadel 7 executed actuator.
  • the valve needle 7 is guided axially displaceable and mounted in the inlet device 5.
  • the Venfilnadel 7 is adjusted between its open and closed positions.
  • the adjusting movement of the valve needle 7 takes place along the valve needle longitudinal axis 12 and is generated by means of a suitable actuator.
  • shock waves are generated in the nozzle, which focus on the nozzle outlet 8 and transfer the shock wave energy at the nozzle exit to the fuel located there, whereby fine fuel droplets emerge, which emerge through the nozzle exit from the nozzle housing 9 and a Form fuel mist.
  • the shock waves are generated by shock wave actuators 10 and 11, which form part of the nozzle outlet 8 opposite wall of the nozzle housing 9.
  • the shock wave actuators 10 and 11 are, for example, piezoelectric elements which change their shape when an electrical voltage is applied, wherein the deformation process within a very short time span.
  • shock wave actuators 10 and 11 are concave shaped in the manner of a concave mirror, such that the focal point is in the nozzle outlet 8.
  • actuators which operate according to the electrohydraulic principle or according to another electrical / mechanical force conversion principle or the HIFU principle.
  • the shock waves run directly from the place of their generation, ie the shock wave actuators 10 and 11, without deflection or reflection to the focusing point at the nozzle exit 8.
  • FIG Fig. 2 An alternative embodiment is shown in FIG Fig. 2 represented where the dashed lines shown shock waves 13 and 14, which mark the maximum radiation angle range, not direct, but multiple reflection from the place of their formation on the shock wave actuator 10 to the focusing point at the nozzle exit 8 are directed.
  • the shock wave actuator 10 is not directly opposite the nozzle outlet 8, but is located in a laterally located wall in the nozzle housing 9 in a position without direct connection to the nozzle outlet. This arrangement has the advantage of a narrow construction.
  • the shock waves are deflected to reflection surfaces 15 and 16, which are inner walls of the nozzle housing delimiting the nozzle interior.
  • reflection surfaces 15 and 16 are provided, at which the shock waves 13 and 14 radiated from the shock wave actuator 10 are reflected, wherein the shock waves of the radiation beam generated by the shock wave actuator 10 same shockwave actuator strike different reflection surfaces. Due to the multiple deflection of the shock waves are basically greater constructive degrees of freedom with regard to the positioning of the shock wave actuators and overall in the structural design of the spray 1.
  • shock wave actuators whose shock waves, depending on the radiation angle, are directed both directly to the focusing point and indirectly via a simple or multiple deflection of reflection surfaces to the focusing point.
  • the shock waves are expediently generated repeatedly per injection process, in particular generated at high frequency.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Nozzles (AREA)
  • Special Spraying Apparatus (AREA)

Abstract

A spray device for fluids having a nozzle and an actuator for regulating the fluid flow through the nozzle exit. In addition, a shock wave actuator or HIFU actuator is provided for generating shock waves or HIFU waves in the fluid present in the nozzle.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Sprüheinrichtung für Fluide. Aus der EP 0 826 875 A1 ist bereits eine Sprüheinrichtung bekannt, die einen Aktor zur Erzeugung von Stoßwellen bekannt, die den Fluidfluss am Düsenautritt einer Düse steuert. Dabei ist bei der bekannten Sprüheinrichtung ein einteiliger Aktor vorgesehen. Ein derartiger Aktor ist je nach Form der Düse relativ aufwendig herzustellen, und die Steuerung des Fluidflusses am Düsenaustritt ist nur in relativ geringem Maße beeinflussbar.The invention relates to a spraying device for fluids. From the EP 0 826 875 A1 A spraying device is already known which discloses an actuator for generating shockwaves, which controls the fluid flow at the nozzle opening of a nozzle. In this case, a one-piece actuator is provided in the known spray device. Such an actuator is relatively expensive to produce depending on the shape of the nozzle, and the control of the fluid flow at the nozzle outlet can be influenced only to a relatively small extent.

Offenbarung der ErfindungDisclosure of the invention

Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, die bekannte Sprüheinrichtung derart weiterzubilden, dass eine flexiblere Ansteuerung der Stoßwellen im Bereich des Düsenaustritts ermöglicht wird. Gleichzeitig soll eine relativ einfache Herstellung ermöglicht werden. Diese Aufgabe wird bei einer Sprüheinrichtung bzw. einem Verfahren zum Betreiben einer Sprüheinrichtung mit den Merkmalen der Ansprüche 1 bzw. 11 gelöst.Based on the illustrated prior art, the invention has the object, the known sprayer such that a more flexible control of the shock waves in the region of the nozzle outlet is made possible. At the same time a relatively simple production should be possible. This object is achieved in a spraying device or a method for operating a spraying device with the features of claims 1 and 11, respectively.

Vorteilhafte Weiterbildungen der erfindungsgemäßen Sprüheinrichtung sind in den Unteransprüchen angegeben.Advantageous developments of the spray device according to the invention are specified in the subclaims.

Die Erzeugung der Stoßwellen erfolgt bevorzugt mithilfe eines Piezoelements oder eines Piezocompositelements, welches beispielsweise einen Wandabschnitt in der Gehäusewandung der Düse bildet Es sind zumindest zwei Stoßwellenaktoren vorgesehen, deren Stoßwellen sich im gewünschten Fokussierpunkt schneiden. Alternativ zu Piezoelementen können auch Stoßwellenaktoren eingesetzt werden, die nach einem elektrohydraulischen Prinzip (Funkentladungsstrecke) arbeiten oder nach einem elektrisch/mechanischen Kraftwandlungsprinzip.The generation of the shock waves preferably takes place with the aid of a piezoelectric element or a piezocomposite element which, for example, forms a wall section in the housing wall of the nozzle. At least two shockwave actuators are provided whose shockwaves intersect at the desired focusing point. As an alternative to piezoelectric elements, it is also possible to use shock wave actuators which operate according to an electrohydraulic principle (radio discharge path) or according to an electrical / mechanical force conversion principle.

Alternativ zu dem Stoßwellenprinzip können auch Piezo- oder Piezocompositelemente oder sonstige schnelle Aktoren verwendet werden, welche nach dem HIFU-Prinzip (High Intensity Focused Ultrasound) arbeiten. Hierbei wird die Stoßwelle durch eine hochfrequente Ultraschallquelle ersetzt.As an alternative to the shock wave principle, it is also possible to use piezo or piezocomposite elements or other fast actuators which operate according to the HIFU principle (High Intensity Focused Ultrasound). Here, the shock wave is replaced by a high-frequency ultrasound source.

Die Fokussierung auf den Düsenaustritt kann sowohl direkt als auch indirekt durchgeführt werden. Bei direkter Fokussierung erfolgt die Stoßwellenausbreitung direkt zwischen dem Stoßwellenaktor und dem Fokussierpunkt, bei indirekter Ausbreitung wird die Stoßwelle zunächst an mindestens einer Reflektionsfläche reflektiert und dann weiter in Richtung auf den Fokussierpunkt geleitet. Der Vorteil der indirekten Ausbreitung liegt in den größeren konstruktiven Gestaltungsmöglichkeiten für die Anordnung des Stoßwellenaktors, so dass beispielsweise sehr schmal bauende Sprüheinrichtungen realisiert werden können.The focus on the nozzle outlet can be carried out both directly and indirectly. With direct focusing, the shock wave propagation occurs directly between the shock wave actuator and the focusing point, with indirect propagation the shock wave is first reflected on at least one reflecting surface and then directed further in the direction of the focusing point. The advantage of the indirect Propagation is in the greater structural design options for the arrangement of the shock wave actuator, so that, for example, very narrow-built sprayers can be realized.

Um die gewünschte Einspritzmenge pro Einspritzvorgang zu erzeugen, kann es zweckmäßig sein, mehrere, kurze aufeinander folgende Stoßwellen zu generieren, die insbesondere hochfrequent erzeugt werden. Die Massendosierung pro Einspritzvorgang wird durch die Anzahl der aufeinander folgenden Stoßwellenpulse bestimmt.In order to generate the desired injection quantity per injection process, it may be expedient to generate a plurality of short, successive shock waves, which are generated in particular at high frequency. The mass dosage per injection process is determined by the number of successive shock wave pulses.

Die genannte Sprüheinrichtung kann in verschiedenartigen Produkten eingesetzt werden. In Frage kommen alle Arten von Einspritzsystemen, insbesondere Einspritzsysteme in Brennkraftmaschinen wie Dieselfahrzeugen oder Benzinfahrzeugen, darüber hinaus aber auch beispielsweise die Eindüsung von Flüssigkeitslösungen in den Abgasstrang einer Brennkraftmaschine als Abgasnachbehandlung (Ammoniakeindüsung). Denkbar sind darüber hinaus auch neuartige Vergaserkonzepte, bei denen derartige Sprüheinrichtungen zum Einsatz kommen können.Said spraying device can be used in various products. In question, all types of injection systems, in particular injection systems in internal combustion engines such as diesel vehicles or gasoline vehicles, but also, for example, the injection of liquid solutions in the exhaust system of an internal combustion engine as exhaust aftertreatment (Ammoniakeindüsung). It is also conceivable novel gasifier concepts in which such spraying can be used.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Weitere Vorteile und zweckmäßige Ausführungen sind den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:

Fig. 1
einen Schnitt durch eine Sprüheinrichtung mit einer Düse, die konkave Wandungen aufweist, welche als Piezoelemente zur Erzeugung von Stoßwellen ausgeführt sind, wobei die Stoßwellen auf den Düsenaustritt zur Erzeugung eines Sprühnebels gerichtet sind,
Fig. 2
eine Sprüheinrichtung in einer alternativen Ausführung, bei der die Stoßwellen zunächst an Reflektionsflächen reflektiert werden, die den Düseninnenraum begrenzen, und anschließend zu dem Fokussierpunkt am Düsenaustritt geleitet werden.
Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:
Fig. 1
a section through a spraying device with a nozzle having concave walls, which are designed as piezoelectric elements for generating shock waves, the shock waves are directed to the nozzle outlet for generating a spray,
Fig. 2
a spraying device in an alternative embodiment, in which the shock waves are first reflected at reflecting surfaces, the Limit the nozzle interior, and then be directed to the focusing point at the nozzle exit.

Ausführungsform(en) der ErfindungEmbodiment (s) of the invention

Bei der in Fig. 1 dargestellten Sprüheinrichtung 1 handelt es sich beispielsweise um ein Kraftstoff-Einspritzsystem für Brennkraftmaschinen. Die Sprüheinrichtung 1 umfasst eine Düse 2, die über eine Zulaufeinrichtung 5, in die Zulaufbohrungen 6 eingebracht sind, mit einem Fluidspeicher 3 verbunden ist. Das Fluid im Fluidspeicher 3 wird über eine Druckerzeugungseinheit 4 - beispielhaft ausgeführt als Pumpe P - unter Druck gesetzt, bei dem es sich insbesondere nur um einen Niederdruck handelt. Das Düsengehäuse 9 ist im Ausführungsbeispiel trichterförmig ausgebildet, an der Spitze des Düsengehäuses befindet sich ein Düsenaustritt 8, der von einem als Venfilnadel 7 ausgeführten Stellglied zu öffnen und zu schließen ist. Die Ventilnadel 7 ist axial verschieblich geführt und in der Zulaufeinrichtung 5 gelagert. In Abhängigkeit von aktuellen Zustands- und Betriebsgrößen des Systems wird die Venfilnadel 7 zwischen ihrer Öffnungs- und Schließposition verstellt. Die Stellbewegung der Ventilnadel 7 erfolgt entlang der Ventilnadel-Längsachse 12 und wird mittels eines geeigneten Aktors erzeugt.At the in Fig. 1 spraying device 1 shown, for example, is a fuel injection system for internal combustion engines. The spraying device 1 comprises a nozzle 2, which is connected via a feed device 5, are introduced into the inlet bores 6, with a fluid reservoir 3. The fluid in the fluid reservoir 3 is pressurized via a pressure generating unit 4 - exemplified as a pump P - which is in particular only a low pressure. The nozzle housing 9 is funnel-shaped in the embodiment, at the tip of the nozzle housing is a nozzle outlet 8, which is to be opened and closed by a Venfilnadel 7 executed actuator. The valve needle 7 is guided axially displaceable and mounted in the inlet device 5. Depending on the current state and operating variables of the system, the Venfilnadel 7 is adjusted between its open and closed positions. The adjusting movement of the valve needle 7 takes place along the valve needle longitudinal axis 12 and is generated by means of a suitable actuator.

Der Kraftstoff wird aus dem Fluidspeicher 3 über die Zulaufbohrungen 6 in der Zulaufeinrichtung 5 in den Düseninnenraum im Düsengehäuse 9 eingeleitet. Zur Erzeugung eines Kraftstoff-Sprühnebels am Düsenaustritt 8 werden in der Düse 2 Stoßwellen erzeugt, die am Düsenaustritt 8 fokussieren und die Stoßwellenenergie am Düsenaustritt auf den dort befindlichen Kraftstoff übertragen, wodurch feine Kraftstofftröpfchen entstehen, die über den Düsenaustritt aus dem Düsengehäuse 9 austreten und einen Kraftstoffnebel bilden. Die Schock- bzw. Stoßwellen werden von Stoßwellenaktoren 10 und 11 erzeugt, die einen Teil der dem Düsenaustritt 8 gegenüberliegenden Wandung des Düsengehäuses 9 bilden. Bei den Stoßwellenaktoren 10 und 11 handelt es sich beispielsweise um Piezoelemente, die bei Anlegen einer elektrischen Spannung ihre Form ändern, wobei der Formänderungsvorgang innerhalb sehr kleiner Zeitspannen erfolgt. Diese Formänderung wird unmittelbar auf das im Innenraum des Düsengehäuses 9 befindliche Fluid übertragen, wodurch die gewünschte Stoßwelle entsteht, die auf den Düsenaustritt 8 zuläuft. Um die Wirkung zu erhöhen, laufen die von den beiden Stoßwellenaktoren 10 und 11 erzeugten Stoßwellen auf einen gemeinsamen Fokussierpunkt zu, der im Düsenaustritt 8 liegt. Zur Unterstützung der Fokussierwirkung sind beide Stoßwellenaktoren 10 und 11 nach Art eines Hohlspiegels konkav geformt, derart, dass der Brennpunkt im Düsenaustritt 8 liegt.The fuel is introduced from the fluid reservoir 3 via the inlet bores 6 in the inlet device 5 into the nozzle interior in the nozzle housing 9. To generate a fuel spray at the nozzle outlet 8 2 shock waves are generated in the nozzle, which focus on the nozzle outlet 8 and transfer the shock wave energy at the nozzle exit to the fuel located there, whereby fine fuel droplets emerge, which emerge through the nozzle exit from the nozzle housing 9 and a Form fuel mist. The shock waves are generated by shock wave actuators 10 and 11, which form part of the nozzle outlet 8 opposite wall of the nozzle housing 9. The shock wave actuators 10 and 11 are, for example, piezoelectric elements which change their shape when an electrical voltage is applied, wherein the deformation process within a very short time span. This change in shape is transmitted directly to the fluid contained in the interior of the nozzle housing 9, whereby the desired shock wave arises, which tapers on the nozzle outlet 8. To increase the effect, the shock waves generated by the two shock wave actuators 10 and 11 to a common focus point, which lies in the nozzle outlet 8. To support the focusing effect both shock wave actuators 10 and 11 are concave shaped in the manner of a concave mirror, such that the focal point is in the nozzle outlet 8.

Alternativ zu den auf dem Piezoeffekt beruhenden Stoßwellenaktoren können auch Aktoren eingesetzt werden, die nach dem elektrohydraulischen Prinzip oder nach einem anderen elektrisch/mechanischen Kraftwandlungsprinzip oder dem HIFU-Prinzip arbeiten.As an alternative to the shock wave actuators based on the piezoelectric effect, it is also possible to use actuators which operate according to the electrohydraulic principle or according to another electrical / mechanical force conversion principle or the HIFU principle.

Bei dem in Fig. 1 dargestellten Ausführungsbeispiel laufen die Stoßwellen direkt vom Ort ihrer Erzeugung, also den Stoßwellenaktoren 10 und 11, ohne Umlenkung bzw. Reflektion zum Fokussierpunkt am Düsenaustritt 8. Eine alternative Ausführung ist in Fig. 2 dargestellt, wo die mit gestrichelten Linien dargestellten Stoßwellen 13 und 14, die den maximalen Abstrahlungs-Winkelbereich markieren, nicht direkt, sondern über mehrfache Reflektion vom Ort ihrer Entstehung am Stoßwellenaktor 10 zum Fokussierpunkt am Düsenaustritt 8 gelenkt werden. Der Stoßwellenaktor 10 liegt dem Düsenaustritt 8 nicht unmittelbar gegenüber, sondern befindet sich in einer seitlich gelegenen Wandung im Düsengehäuse 9 in einer Position ohne direkte Verbindung zum Düsenaustritt. Diese Anordnung weist den Vorteil einer schmalen Bauweise auf. Um die Stoßwellen 13 und 14 zum Fokussierpunkt am Düsenaustritt 8 zu lenken, werden die Stoßwellen an Reflektionsflächen 15 und 16 umgelenkt, bei denen es sich um den Düseninnenraum begrenzende Innenwandungen des Düsengehäuses handelt. Im Ausführungsbeispiel sind zwei Reflektionsflächen 15 und 16 vorgesehen, an denen die von dem Stoßwellenaktor 10 ausgestrahlten Stoßwellen 13 und 14 reflektiert werden, wobei über den von dem Stoßwellenaktor 10 erzeugten Abstrahlungs-Winkelbereich die Stoßwellen des gleichen Stoßwellenaktors an unterschiedlichen Reflektionsflächen auftreffen. Aufgrund der mehrfachen Umlenkung der Stoßwellen bestehen grundsätzlich größere konstruktive Freiheitsgrade im Hinblick auf die Positionierung der Stoßwellenaktoren sowie insgesamt bei der konstruktiven Gestaltung der Sprüheinrichtung 1.At the in Fig. 1 illustrated embodiment, the shock waves run directly from the place of their generation, ie the shock wave actuators 10 and 11, without deflection or reflection to the focusing point at the nozzle exit 8. An alternative embodiment is shown in FIG Fig. 2 represented where the dashed lines shown shock waves 13 and 14, which mark the maximum radiation angle range, not direct, but multiple reflection from the place of their formation on the shock wave actuator 10 to the focusing point at the nozzle exit 8 are directed. The shock wave actuator 10 is not directly opposite the nozzle outlet 8, but is located in a laterally located wall in the nozzle housing 9 in a position without direct connection to the nozzle outlet. This arrangement has the advantage of a narrow construction. In order to direct the shock waves 13 and 14 to the focusing point at the nozzle outlet 8, the shock waves are deflected to reflection surfaces 15 and 16, which are inner walls of the nozzle housing delimiting the nozzle interior. In the exemplary embodiment, two reflection surfaces 15 and 16 are provided, at which the shock waves 13 and 14 radiated from the shock wave actuator 10 are reflected, wherein the shock waves of the radiation beam generated by the shock wave actuator 10 same shockwave actuator strike different reflection surfaces. Due to the multiple deflection of the shock waves are basically greater constructive degrees of freedom with regard to the positioning of the shock wave actuators and overall in the structural design of the spray 1.

Denkbar ist auch, Stoßwellenaktoren vorzusehen, deren Stoßwellen je nach Abstrahlungswinkel sowohl direkt auf den Fokussierpunkt als auch indirekt über eine einfache oder mehrfache Umlenkung an Reflektionsflächen zum Fokussierpunkt gelenkt werden.It is also conceivable to provide shock wave actuators whose shock waves, depending on the radiation angle, are directed both directly to the focusing point and indirectly via a simple or multiple deflection of reflection surfaces to the focusing point.

Um die erforderliche Energie für die Erzeugung vorzugsweise kleiner Tropfen am Düsenaustritt 8 mittels der Stoßwellen zu erzeugen, werden die Stoßwellen zweckmäßig pro Einspritzvorgang wiederholt erzeugt, insbesondere hochfrequent generiert. In order to generate the energy required for generating preferably small droplets at the nozzle outlet 8 by means of the shock waves, the shock waves are expediently generated repeatedly per injection process, in particular generated at high frequency.

Claims (11)

  1. Spray device (1) for fluids, with a nozzle (2) and an actuating member (7) for regulating the fluid stream through a nozzle outlet (8), the spray device (1) comprising a plurality of shock-wave or HIFU actuators (10, 11) in the fluid located in the nozzle (2), and the shock or HIFU waves (13, 14) generated by the plurality of shock-wave or HIFU actuators (10, 11) being focused upon the nozzle outlet (8).
  2. Spray device according to Claim 1, characterized in that the shock-wave or HIFU actuators (10, 11) are integrated into the nozzle housing (9).
  3. Spray device according to Claim 2, characterized in that the shock-wave or HIFU actuators (10, 11) form a concavely shaped wall portion of the nozzle housing (9).
  4. Spray device according to one of Claims 1 to 3, characterized in that the shock-wave or HIFU actuators (10, 11) are designed as a piezo element or piezo-composite element.
  5. Spray device according to one of Claims 1 to 4, characterized in that the shock-wave or HIFU actuators (10, 11) are designed as an electrohydraulic actuator.
  6. Spray device according to one of Claims 1 to 5, characterized in that the shock-wave or HIFU actuators (10, 11) are designed as an electromechanical actuator.
  7. Spray device according to one of Claims 1 to 6, characterized in that the shock or HIFU waves (13, 14) generated by the shock-wave or HIFU actuators (10, 11) are reflected on a housing wall (15, 16) of the nozzle (2) and are steered to the nozzle outlet (8).
  8. Spray device according to one of Claims 1 to 7, characterized in that a pressure generation unit (4) is provided, via which the fluid can be acted upon with pressure.
  9. Spray device according to one of Claims 1 to 8, characterized in that, for the metering of the fluid stream through the nozzle outlet (8), a plurality of successive shock-wave pulses or HIFU-wave segments are generated.
  10. Spray device according to one of Claims 1 to 9, characterized by a design as an injection system for liquid fuels, in particular in internal combustion engines.
  11. Method for operating the spray device according to one of Claims 1 to 10, in which shock or HIFU waves (13, 14) are directed onto the fluid at a defined focusing point.
EP07727969A 2006-06-06 2007-04-11 Spray device for fluids Not-in-force EP2029887B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006026153A DE102006026153A1 (en) 2006-06-06 2006-06-06 Spraying device for fluids
PCT/EP2007/053501 WO2007141071A1 (en) 2006-06-06 2007-04-11 Spray device for fluids

Publications (2)

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EP2029887A1 EP2029887A1 (en) 2009-03-04
EP2029887B1 true EP2029887B1 (en) 2012-02-22

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EP07727969A Not-in-force EP2029887B1 (en) 2006-06-06 2007-04-11 Spray device for fluids

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US (1) US20090302131A1 (en)
EP (1) EP2029887B1 (en)
JP (1) JP2009540176A (en)
AT (1) ATE546638T1 (en)
DE (1) DE102006026153A1 (en)
WO (1) WO2007141071A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102008000760A1 (en) * 2008-03-19 2009-09-24 Robert Bosch Gmbh Component pairing and device with component pairing
DE102008042850A1 (en) 2008-10-15 2010-04-22 Robert Bosch Gmbh Injector
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US20090302131A1 (en) 2009-12-10
ATE546638T1 (en) 2012-03-15
EP2029887A1 (en) 2009-03-04
JP2009540176A (en) 2009-11-19
DE102006026153A1 (en) 2007-12-13
WO2007141071A1 (en) 2007-12-13

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