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EP2013470B1 - Method for reducing depositions within a spray hole of a fuel injection device - Google Patents

Method for reducing depositions within a spray hole of a fuel injection device Download PDF

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Publication number
EP2013470B1
EP2013470B1 EP07802846A EP07802846A EP2013470B1 EP 2013470 B1 EP2013470 B1 EP 2013470B1 EP 07802846 A EP07802846 A EP 07802846A EP 07802846 A EP07802846 A EP 07802846A EP 2013470 B1 EP2013470 B1 EP 2013470B1
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EP
European Patent Office
Prior art keywords
injection
injection hole
injector
hole
throttle
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Active
Application number
EP07802846A
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German (de)
French (fr)
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EP2013470A2 (en
Inventor
Andreas Weigand
Oliver Kastner
Frank Atzler
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Continental Automotive GmbH
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Continental Automotive GmbH
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Publication of EP2013470A2 publication Critical patent/EP2013470A2/en
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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/007—Cleaning
    • F02M65/008—Cleaning of injectors only

Definitions

  • the invention relates to a method for reducing deposits within a spray hole of a Kraftstoffeinspritzvorrichutng according to the features of the preamble of the main claim. 1
  • Fuel injectors for operating an internal combustion engine have generally been known for many years.
  • the fuel supply takes place in the respective combustion chamber of the internal combustion engine by injectors, in particular by piezo injectors.
  • injectors in particular by piezo injectors.
  • different properties of these systems are required to ensure emission limits, fuel consumption minimization and longevity of the system and thus of the vehicle.
  • German Offenlegungsschrift DE 102 13 011 A1 discloses in which fuel is injected by means of an injection nozzle having a plurality of injection holes directly into a working space as a pre- and main injection.
  • fuel is injected by means of an injection nozzle having a plurality of injection holes directly into a working space as a pre- and main injection.
  • a special design of the combustion chamber and the piston head to adjust the stroke of a nozzle needle of the injection nozzle such that a limitation of the range of the injected fuel jets is achieved.
  • US Patent US 4,208,014 A a fuel injector presented in which a pointed nozzle needle in a blind hole of the injector a spray hole, optionally opens or closes.
  • the nozzle needle is shaped and arranged in the blind hole, that an opening cross section at the injection hole in almost all positions the nozzle needle is smaller than the passage cross section at the seat of the nozzle needle.
  • the proposed arrangement is intended to ensure that the fuel pressure at the spray hole, regardless of the needle stroke and even with very small needle strokes, corresponds to the full system pressure.
  • an injector with at least one spray hole is known, which means for selectively generating cavitation at the outlet opening the injection hole or over the entire injection hole length are removed.
  • the shape of the injection hole which is determined by deposits within the injection hole and through the outlet opening, exerts an influence on the injection jet preparation and thus degrades the exhaust emission in a design of the injector to a reduction of deposits and / or in a design of the injector on coking ,
  • the object underlying the present invention is now to provide a method which allows a reduction of the deposits without varying the shape of at least one injection hole.
  • An advantageous embodiment of the invention is that more accurate injection quantities are made possible due to a variably adjustable injection inlet pressure within the injector.
  • FIG. 1 shows a schematic sketch of a nozzle unit with two spray holes and a nozzle needle. Shown is a nozzle body housing 5, within which, for example, two spray holes 1 are located.
  • the injection holes 1 connect a blind hole 6 with a combustion chamber (not shown in the drawing). About them, a predetermined amount of fuel, depending on the adjustable spray hole inlet pressure, from the blind hole 6 flow into the combustion chamber.
  • a nozzle needle 2 is shown, which influences the opening cross section of the provided between the nozzle body housing 5 and nozzle needle 2 throttle gap 4 by their variably adjustable vertical position.
  • Seat throttling occurs when the nozzle needle 2 is controlled with respect to a maximum stroke such that the frustoconical surface, which is virtually determined by the distance between the nozzle needle and nozzle body housing is smaller than the outlet cross-sectional area of a spray hole 1 or the sum of the outlet cross-sectional areas of several Spray holes 1.
  • the frustoconical surface between the nozzle needle 2 and the nozzle body housing 5 in this case has perpendicular to the nozzle needle 2 and extends axially symmetrical about the vertical axis.
  • operating points in an engine map as cleaning points via a seat throttle operation.
  • Operating points have been found to be particularly suitable here, which undergo high pressure gradient between combustion chamber and injection hole in transient operation of the internal combustion engine. These pressure gradients between the individual operating points can be reduced by driving correspondingly lower loads in seat throttling operation.
  • the adjustment of the spray-hole inlet pressure takes place via the seat throttling, i. via the throttle gap 4 variably adjustable through the nozzle needle 2, at e.g. constant system pressure.
  • to reduce the deposits has proven to be particularly advantageous that operating points are driven with high loads and system pressures.
  • FIG. 2 shows a fuel volume flow path through a spray hole depending on the needle stroke.
  • FIG. 2 is in the vertical direction of the volume flow and applied in the horizontal direction of the needle stroke.
  • the volume flow characteristic curve 1 increases with increasing needle stroke to the point H1, in which the needle stroke and thus the throttle gap are maximum.
  • the fuel volume flow characteristic curve 1 in this case has an increasing characteristic curve with an increasing needle stroke with simultaneously falling volumetric flow gradients.
  • Seat throttling is present in the area of low needle strokes with simultaneously high volumetric flow gradients, while, on the other hand, with increasing needle stroke and thus falling volume flow gradient, a transition to a hole throttling takes place.

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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)

Abstract

The invention relates to a method for reducing depositions within spray holes. For this purpose, an injector is operated in the so-called seat throttling mode. It is thereby made possible to carry out various cleaning sequences at defined times during seat throttle operation and/or at certain operating points.

Description

Die Erfindung betrifft ein Verfahren zur Reduzierung von Ablagerungen innerhalb eines Spritzlochs einer Kraftstoffeinspritzvorrichutng gemäß den Merkmalen des Oberbegriffs des Hauptanspruchs 1.The invention relates to a method for reducing deposits within a spray hole of a Kraftstoffeinspritzvorrichutng according to the features of the preamble of the main claim. 1

Kraftstoffeinspritzvorrichtungen zum Betrieb einer Brennkraftmaschine sind generell seit vielen Jahren bekannt. Bei einem sogenannten Common-Rail Einspritzsystem erfolgt die Kraftstoffzuführung in den jeweiligen Brennraum der Brennkraftmaschine durch Injektoren, insbesondere durch Piezoinjektoren. Für verschiedene Fahrzustände werden unterschiedliche Eigenschaften von diesen Systemen gefordert, um Schadstoffemissionsgrenzen, Kraftstoffverbrauchsminimierung und auch Langlebigkeit des Systems und damit des Fahrzeugs zu gewährleisten.Fuel injectors for operating an internal combustion engine have generally been known for many years. In a so-called common rail injection system, the fuel supply takes place in the respective combustion chamber of the internal combustion engine by injectors, in particular by piezo injectors. For different driving conditions different properties of these systems are required to ensure emission limits, fuel consumption minimization and longevity of the system and thus of the vehicle.

Eine solche Vorrichtung ist beispielsweise in der deutschen Offenlegungsschrift DE 102 13 011 A1 offenbart, bei welcher Kraftstoff mittels einer Einspritzdüse mit mehreren Einspritzbohrungen direkt in einen Arbeitsraum als Vor- und Haupteinspritzung eingespritzt wird. Um dabei die Benetzung der Brennraumwände mit Kraftstoff zu minimieren wird neben einer speziellen Gestaltung des Brennraumes und des Kolbenbodens vorgeschlagen, den Hub einer Düsennadel der Einspritzdüse derart einzustellen, dass eine Begrenzung der Reichweite der eingespritzten Kraftstoffstrahlen erzielt wird.Such a device is for example in German Offenlegungsschrift DE 102 13 011 A1 discloses in which fuel is injected by means of an injection nozzle having a plurality of injection holes directly into a working space as a pre- and main injection. In order to minimize the wetting of the combustion chamber walls with fuel is proposed in addition to a special design of the combustion chamber and the piston head to adjust the stroke of a nozzle needle of the injection nozzle such that a limitation of the range of the injected fuel jets is achieved.

Weiterhin wird in der US-Patentschrift US 4,208,014 A eine Kraftstoffeinspritzvorrichtung vorgestellt, bei der eine spitze Düsennadel in einem Sackloch des Injektors ein Spritzloch, wahlweise öffnet oder verschließt. Dabei ist die Düsennadel so geformt und im Sackloch angeordnet, dass ein Öffnungsquerschnitt am Spritzloch in nahezu allen Positionen der Düsennadel kleiner ist als der Durchtrittsquerschnitt am Sitz der Düsennadel. Durch die vorgeschlagene Anordnung soll erreicht werden, dass der Kraftstoffdruck am Spritzloch, unabhängig vom Nadelhub und auch bei sehr geringen Nadelhüben, dem vollen Systemdruck entspricht.Furthermore, in US Patent US 4,208,014 A a fuel injector presented in which a pointed nozzle needle in a blind hole of the injector a spray hole, optionally opens or closes. The nozzle needle is shaped and arranged in the blind hole, that an opening cross section at the injection hole in almost all positions the nozzle needle is smaller than the passage cross section at the seat of the nozzle needle. The proposed arrangement is intended to ensure that the fuel pressure at the spray hole, regardless of the needle stroke and even with very small needle strokes, corresponds to the full system pressure.

Mit zunehmender Leistungsdichte steigt bei modernen Verbrennungsmotoren die Tendenz zur Bildung von Ablagerungen in wenigstens einem Spritzloch. Auch können höhere Abgasrückführraten in den Brennraum zu vermehrten Ablagerungen in den Spritzlöchern führen. Diese Ablagerungen haben über die Laufzeit gesehen eine Reduzierung der eingebrachten Kraftstoffmenge, insbesondere bei Volllastbetrieb und damit eine Reduzierung der Motorleistung zur Folge. Weiterhin ergibt sich durch die Ablagerungen eine Erhöhung der Abgasemissionen durch Verkokung.As power density increases, modern internal combustion engines tend to form deposits in at least one injection hole. Also higher exhaust gas recirculation rates in the combustion chamber can lead to increased deposits in the spray holes. These deposits have over the term seen a reduction in the amount of fuel introduced, especially at full load and thus a reduction in engine performance. Furthermore, the deposits result in an increase in exhaust emissions due to coking.

Aus der Druckschrift DE 102 25 683 A1 ist ein Injektor mit wenigstens einem Spritzloch bekannt, welches eine Einrichtung zur gezielten Erzeugung von Kavitation an der Auslassöffnung des Spritzlochs oder über die gesamte Spritzlochlänge entfernt werden.From the publication DE 102 25 683 A1 an injector with at least one spray hole is known, which means for selectively generating cavitation at the outlet opening the injection hole or over the entire injection hole length are removed.

Die Formgebung des Spritzlochs, die durch Ablagerungen innerhalb des Spritzlochs und durch die Auslassöffnung bestimmt wird, übt allerdings Einfluss auf die Einspritzstrahlaufbereitung aus und verschlechtert damit die Abgasemission bei einer Auslegung des Injektors auf eine Reduktion von Ablagerungen und/oder bei einer Auslegung des Injektors auf Verkoken.However, the shape of the injection hole, which is determined by deposits within the injection hole and through the outlet opening, exerts an influence on the injection jet preparation and thus degrades the exhaust emission in a design of the injector to a reduction of deposits and / or in a design of the injector on coking ,

Die der vorliegenden Erfindung zu Grunde liegende Aufgabe besteht nun darin, ein Verfahren bereitzustellen, das eine Reduzierung der Ablagerungen ohne Variation der Formgebung wenigstens eines Spritzlochs ermöglicht.The object underlying the present invention is now to provide a method which allows a reduction of the deposits without varying the shape of at least one injection hole.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.This object is achieved by the features of claim 1. Advantageous embodiments of the invention are characterized in the subclaims.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, dass eine freie Auslegung der Formgebung des Spritzlochs, unabhängig von der Ablagerungsproblematik, nach Gesichtspunkten optimaler Emissionen und maximaler Leistung erfolgen kann.The advantages achieved by the invention are, in particular, that a free interpretation of the shape of the injection hole, regardless of the deposition problem, can be made according to aspects of optimal emissions and maximum performance.

Eine vorteilhafte Ausgestaltung der Erfindung besteht darin, dass aufgrund eines variabel einstellbaren Spritzlocheintrittsdrucks innerhalb des Injektors genauere Einspritzmengen ermöglicht werden.An advantageous embodiment of the invention is that more accurate injection quantities are made possible due to a variably adjustable injection inlet pressure within the injector.

Einzelheiten der Erfindung werden anhand der Zeichnungen näher erläutert. Dabei zeigt:

  • Figur 1: eine schematische Skizze einer Düseneinheit (entspricht einem Ausschnitt eines Injektors) mit zwei Spritzlöchern und einer Düsennadel,
  • Figur 2: einen Kraftstoffvolumenstromverlauf durch ein Spritzloch abhängig vom Nadelhub.
Details of the invention will be explained in more detail with reference to the drawings. Showing:
  • FIG. 1 : a schematic sketch of a nozzle unit (corresponds to a section of an injector) with two spray holes and a nozzle needle,
  • FIG. 2 : a fuel volume flow path through a spray hole depending on the needle stroke.

Figur 1 zeigt eine schematische Skizze einer Düseneinheit mit zwei Spritzlöchern und einer Düsennadel. Dargestellt ist ein Düsenkörpergehäuse 5, innerhalb dessen sich beispielhaft zwei Spritzlöcher 1 befinden. Die Spritzlöcher 1 verbinden dabei ein Sackloch 6 mit einem Brennraum (in der Zeichnung nicht dargestellt). Über sie kann eine vorgebbare Kraftstoffmenge, abhängig vom einstellbaren Spritzlocheintrittsdruck, aus dem Sackloch 6 in den Brennraum strömen. Weiterhin ist eine Düsennadel 2 dargestellt, die durch ihre variabel einstellbare vertikale Position den Öffnungsquerschnitt des zwischen Düsenkörpergehäuse 5 und Düsennadel 2 vorgesehenen Drosselspalts 4 beeinflusst. FIG. 1 shows a schematic sketch of a nozzle unit with two spray holes and a nozzle needle. Shown is a nozzle body housing 5, within which, for example, two spray holes 1 are located. The injection holes 1 connect a blind hole 6 with a combustion chamber (not shown in the drawing). About them, a predetermined amount of fuel, depending on the adjustable spray hole inlet pressure, from the blind hole 6 flow into the combustion chamber. Furthermore, a nozzle needle 2 is shown, which influences the opening cross section of the provided between the nozzle body housing 5 and nozzle needle 2 throttle gap 4 by their variably adjustable vertical position.

Zur Reduzierung von Ablagerungen innerhalb des Spritzlochs 1 wird der Injektor in einer Sitzdrosselung gefahren. Sitzdrosselung liegt vor, wenn die Düsennadel 2 in Bezug auf einen maximalen Hub derart angesteuert wird, dass die kegelstumpfartig ausgebildete Fläche, die durch den Abstand zwischen Düsennadel und Düsenkörpergehäuse virtuell bestimmt wird, kleiner ist als die Austrittsquerschnittsfläche eines Spritzlochs 1 oder die Summe der Austrittsquerschnittsflächen mehrerer Spritzlöcher 1. Die kegelstumpfartige Fläche zwischen der Düsennadel 2 und dem Düsenkörpergehäuse 5 weist dabei senkrecht auf die Düsennadel 2 und verläuft axialsymmetrisch um die vertikale Achse.To reduce deposits within the spray hole 1 of the injector is driven in a seat throttling. Seat throttling occurs when the nozzle needle 2 is controlled with respect to a maximum stroke such that the frustoconical surface, which is virtually determined by the distance between the nozzle needle and nozzle body housing is smaller than the outlet cross-sectional area of a spray hole 1 or the sum of the outlet cross-sectional areas of several Spray holes 1. The frustoconical surface between the nozzle needle 2 and the nozzle body housing 5 in this case has perpendicular to the nozzle needle 2 and extends axially symmetrical about the vertical axis.

Durch die aufgrund der Verkleinerung des Öffnungsquerschnitts des Drosselspalts 4 entstehende Anhebung der turbulenten kinetischen Energie, und die in gewissen Bereichen entstehende Kavitation können Ablagerungen in den Spritzlöchern 1 vermieden werden.As a result of the increase in turbulent kinetic energy arising due to the reduction in the opening cross-section of the throttle gap 4 and the cavitation arising in certain areas, deposits in the spray holes 1 can be avoided.

Zur Vermeidung von Ablagerungen können daher Reinigungssequenzen während der Laufzeiten über den Sitzdrosselbetrieb eingeführt werden. Da die Druckdifferenz zwischen dem Spritzlocheintrittsdruck und dem Spritzlochaustrittsdruck einen wesentlichen Einfluss auf das Verbrennungsverhalten ausübt, ist eine möglichst genaue Einstellung des Spritzlocheintrittsdrucks von großer Bedeutung. Die Drosselverluste, die durch den variabel veränderbaren Drosselspalt 4 entstehen und damit einen geringeren Spritzlocheintrittsdruck bewirken, können durch jeweils einen höheren Systemdruck ausgeglichen werden, ohne dabei Nachteile bei der Emission in Kauf nehmen zu müssen.To avoid deposits, therefore, cleaning sequences can be introduced during the running times via the seat throttling operation. Since the pressure difference between the spray hole entry pressure and the spray hole discharge pressure exerts a significant influence on the combustion behavior, is the most accurate possible adjustment of the spray hole inlet pressure of great importance. The throttle losses caused by the variably variable throttle gap 4 and thus cause a lower spray-hole inlet pressure can be compensated by a higher system pressure, without having to accept disadvantages in the emission in purchasing.

Weiterhin besteht die Möglichkeit, Betriebspunkte in einem Motorkennfeld als Reinigungspunkte über einen Sitzdrosselbetrieb zu verwenden. Als besonders geeignet haben sich hier Betriebspunkte herausgestellt, die bei transientem Betrieb der Brennkraftmaschine hohe Druckgradienten zwischen Brennraum und Spritzloch durchlaufen. Diese Druckgradienten zwischen den einzelnen Betriebspunkten können dadurch reduziert werden, dass entsprechend niedrigere Lasten im Sitzdrosselbetrieb gefahren werden. Die Einstellung des Spritzlocheintrittsdrucks erfolgt dabei über die Sitzdrosselung, d.h. über den durch die Düsennadel 2 variabel einstellbaren Drosselspalt 4, bei z.B. konstantem Systemdruck. Weiterhin hat sich zur Reduzierung der Ablagerungen als besonders vorteilhaft erwiesen, dass Betriebspunkte mit hohen Lasten und Systemdrücken gefahren werden.Furthermore, it is possible to use operating points in an engine map as cleaning points via a seat throttle operation. Operating points have been found to be particularly suitable here, which undergo high pressure gradient between combustion chamber and injection hole in transient operation of the internal combustion engine. These pressure gradients between the individual operating points can be reduced by driving correspondingly lower loads in seat throttling operation. The adjustment of the spray-hole inlet pressure takes place via the seat throttling, i. via the throttle gap 4 variably adjustable through the nozzle needle 2, at e.g. constant system pressure. Furthermore, to reduce the deposits has proven to be particularly advantageous that operating points are driven with high loads and system pressures.

Figur 2 zeigt einen Kraftstoffvolumenstromverlauf durch ein Spritzloch abhängig vom Nadelhub. In der Figur 2 ist in vertikaler Richtung der Volumenstrom und in horizontaler Richtung der Nadelhub aufgetragen. FIG. 2 shows a fuel volume flow path through a spray hole depending on the needle stroke. In the FIG. 2 is in the vertical direction of the volume flow and applied in the horizontal direction of the needle stroke.

Der Volumenstromkennlinienverlauf 1 steigt dabei mit steigendem Nadelhub bis zum Punkt H1, bei dem der Nadelhub und somit der Drosselspalt maximal sind. Der Kraftstoffvolumenstromkennlinienverlauf 1 weist dabei mit steigendem Nadelhub einen ansteigenden Kennlinienverlauf mit gleichzeitig fallenden Volumenstromgradienten auf. Eine Sitzdrosselung liegt dabei im Bereich geringer Nadelhübe mit gleichzeitig starken Volumenstromgradienten vor, während hingegen mit steigendem Nadelhub und damit fallenden Volumenstromgradienten ein Übergang zu einer Lochdrosselung erfolgt.The volume flow characteristic curve 1 increases with increasing needle stroke to the point H1, in which the needle stroke and thus the throttle gap are maximum. The fuel volume flow characteristic curve 1 in this case has an increasing characteristic curve with an increasing needle stroke with simultaneously falling volumetric flow gradients. Seat throttling is present in the area of low needle strokes with simultaneously high volumetric flow gradients, while, on the other hand, with increasing needle stroke and thus falling volume flow gradient, a transition to a hole throttling takes place.

Claims (4)

  1. Method for reduction of deposits on at least one injection hole (1) provided in a fuel injection device with defined outlet cross-sectional surface which connects a blind hole (6) in the shape of a hollow cone present in the housing of an injector, especially of a piezoinjector, surrounding the tip of an injection pin embodied as the base of a cone, to a combustion chamber of a combustion engine, characterised in that
    cleaning of the at least one injection hole (1) is carried out at specific operating points in that these operating points are defined in an engine map as cleaning points at which the injector is operated in seat throttling mode, with seat throttling mode being defined by a reduced opening cross section of a throttle gap (4) provided between a needle body housing (5) and the valve pin (2), so that the valve pin (2) is activated in relation to a maximum stroke such that a surface pointing from the injection pin end perpendicular to the needle body housing (5) corresponds to the virtual jacket surface of a truncated cone arranged axial-symmetrically around the vertical injector pin axis, which is smaller than the outlet cross-sectional surface of an injection hole (1) or the sum of the outlet cross-sectional surfaces of a number of injection holes (1).
  2. Method according to claim 1, characterised in that cleaning of the at least one injection hole (1) is carried out at predetermined times.
  3. Method according to claim 1 or 2, characterised in that the throttle losses in the throttle gap (4) are compensated for by a raised system pressure.
  4. Method according to one of the previous claims, characterised in that the injection hole inlet pressure at a predetermined system pressure is controlled via the throttle losses in the throttle gap (4).
EP07802846A 2006-08-29 2007-08-24 Method for reducing depositions within a spray hole of a fuel injection device Active EP2013470B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006040394 2006-08-29
PCT/EP2007/058794 WO2008025728A2 (en) 2006-08-29 2007-08-24 Method for reducing depositions within a spray hole of a fuel injection device

Publications (2)

Publication Number Publication Date
EP2013470A2 EP2013470A2 (en) 2009-01-14
EP2013470B1 true EP2013470B1 (en) 2010-10-06

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EP (1) EP2013470B1 (en)
AT (1) ATE483908T1 (en)
DE (1) DE502007005272D1 (en)
WO (1) WO2008025728A2 (en)

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RU2646714C1 (en) * 2016-10-17 2018-03-06 Олег Савельевич Кочетов Kochetov acoustic nozzle
RU2646191C1 (en) * 2016-10-17 2018-03-01 Олег Савельевич Кочетов Kochetov complex atomiser
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RU2631282C1 (en) * 2016-11-11 2017-09-20 Олег Савельевич Кочетов Complex atomizer
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RU2651224C1 (en) * 2017-04-27 2018-04-18 Олег Савельевич Кочетов Pneumatic nozzle
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RU2658026C1 (en) * 2017-09-21 2018-06-19 Олег Савельевич Кочетов Combined coil
RU2656449C1 (en) * 2017-09-21 2018-06-05 Олег Савельевич Кочетов Acoustic atomizer
RU2658027C1 (en) * 2017-09-21 2018-06-19 Олег Савельевич Кочетов Pneumatic nozzle
RU2668904C1 (en) * 2018-02-13 2018-10-04 Олег Савельевич Кочетов Pneumatic nozzle
RU2668032C1 (en) * 2018-02-13 2018-09-25 Олег Савельевич Кочетов Swirl nozzle
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EP2013470A2 (en) 2009-01-14
WO2008025728A3 (en) 2008-04-10
DE502007005272D1 (en) 2010-11-18
WO2008025728A2 (en) 2008-03-06
ATE483908T1 (en) 2010-10-15

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