WO2019068321A1 - Injection valve for metering two fuels - Google Patents

Injection valve for metering two fuels Download PDF

Info

Publication number
WO2019068321A1
WO2019068321A1 PCT/EP2017/075216 EP2017075216W WO2019068321A1 WO 2019068321 A1 WO2019068321 A1 WO 2019068321A1 EP 2017075216 W EP2017075216 W EP 2017075216W WO 2019068321 A1 WO2019068321 A1 WO 2019068321A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
fuel
needle
sealing
seat
Prior art date
Application number
PCT/EP2017/075216
Other languages
German (de)
French (fr)
Inventor
Bernd Stuke
Olaf Ohlhafer
Felix Jaegle
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201780095549.5A priority Critical patent/CN111164290B/en
Priority to PCT/EP2017/075216 priority patent/WO2019068321A1/en
Priority to DE112017007710.9T priority patent/DE112017007710A5/en
Publication of WO2019068321A1 publication Critical patent/WO2019068321A1/en

Links

Classifications

    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0686—Injectors
    • F02D19/0694—Injectors operating with a plurality of fuels
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
    • F02M21/026—Lift valves, i.e. stem operated valves
    • F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle valves
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
    • F02M21/026—Lift valves, i.e. stem operated valves
    • F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle valves
    • F02M21/0266—Hollow stem valves; Piston valves; Stems having a spherical tip
    • 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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F02D19/10—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • the invention relates to an injection valve for the metering of two fuels, as used for example for introducing these fuels into the combustion chamber of an internal combustion engine.
  • injection valves which can introduce a gaseous fuel on the one hand and on the other hand, a liquid fuel, such as diesel fuel in a combustion chamber. In this way, an ignition of the fuel-air mixture can be carried out by the liquid fuel, while the main amount of energy is supplied via the gaseous fuel, so that can be dispensed with a spark ignition.
  • a fuel injection valve is known for example from DE 10 2014 225 167 AI. This injection valve has a housing in which an outer nozzle needle and an inner nozzle needle are guided, wherein the inner nozzle needle is arranged in the outer nozzle needle.
  • the outer nozzle needle cooperates with an outer nozzle seat for opening and closing one or more injection openings through which, for example, a gaseous fuel can be emptied.
  • the inner nozzle needle cooperates with a nozzle seat formed in the interior of the outer nozzle needle for opening and closing one or more injection openings, via which the liquid fuel can be injected.
  • Both nozzle needles can be independently, for example via servo-hydraulic valves, in the longitudinal direction move so that both the outer nozzle seat and the inner nozzle seat can be opened and closed independently. With such an injection valve, it is possible to introduce an ignition amount of liquid fuel by moving the inner nozzle needle and then a larger amount of gaseous fuel by moving the outer nozzle needle, which contributes the majority of the combustion energy.
  • Both nozzle needles are guided, which must be done via these guides a seal between the gaseous and the liquid fuel.
  • This seal is not absolutely leakproof, so that liquid fuel can penetrate into the gaseous and possibly vice versa, depending on the guides and depending on the particular pressure of the fuels.
  • Such a mixture of the fuels can lead to problems in the combustion, since liquid fuel which is discharged through the provided for the gaseous fuel injection openings, is poorly atomized and thereby leads to a poor combustion within the combustion chamber.
  • the injection valve according to the invention with the features of claim 1 has the advantage that both fuels can be safely sealed against each other within the injector without major structural changes would be required.
  • the injection valve for metering two fuels has a nozzle body in which a hollow nozzle needle is arranged to be longitudinally displaceable, which cooperates with an outer nozzle seat for opening and closing an injection opening for a first fuel.
  • a nozzle needle is provided, which is arranged longitudinally displaceable in the hollow nozzle needle and which cooperates with a nozzle hollow needle formed in the inner nozzle seat for opening and closing an injection port, wherein the hollow needle nozzle is guided in the nozzle body to form a throttle gap.
  • a first, the nozzle hollow needle surrounding pressure chamber can be filled with a first fuel and a second pressure chamber with a second fuel, wherein the nozzle needle protrudes with an outer nozzle seat facing away from the end region into the second pressure chamber.
  • a circumferential sealing body is arranged, which cooperates with a sealing seat and thereby seals the second pressure chamber in the direction of the throttle gap.
  • peripheral sealing body of the throttle gap which is necessarily formed between the first and second pressure chamber, are sealed, so that through this throttle gap no fuel from the first to the second pressure chamber or from the second can reach into the first pressure chamber. This keeps both fuel within the injector separate and does not affect the function.
  • the sealing body is acted upon by the pressure in the second pressure chamber in the direction of the sealing seat, whereby an additional sealing effect is achieved.
  • injectors which can meter two different fuels, usually one of the fuels is provided under a higher pressure than the other, can be in the second pressure chamber, the fuel with the higher pressure hold, so that a strong sealing force exerted on the seal body and so that a correspondingly secure seal is achieved.
  • the sealing body is formed as attached to the nozzle hollow needle sealing lip, which is resilient.
  • the sealing lip is correspondingly flexible, so that it is pressed for example by the pressure in the second pressure chamber on all sides against the sealing seat.
  • the sealing body is preferably made of metal in order to achieve the necessary flexibility on the one hand and a sufficient pressure resistance to the pressure in the second pressure chamber on the other.
  • the sealing body with the hollow nozzle needle is firmly connected, preferably welded, so that a secure seal is achieved between the seal body and the hollow needle nozzle.
  • the injection opening is formed in the nozzle hollow needle, wherein, of course, also several injection openings can be seen.
  • the formation of the injection openings in the hollow needle nozzle is easier to implement than in a complex nozzle body, since the accessibility for tools is improved.
  • an injection valve according to the invention is shown schematically in longitudinal section.
  • an injection valve according to the invention is shown schematically in longitudinal section.
  • the injection valve has a nozzle body 1, in which a first pressure chamber 2 is formed, in which a hollow nozzle needle 4 is arranged to be longitudinally displaceable.
  • the hollow nozzle needle 4 cooperates with an outer nozzle seat 6 for opening and closing one or more injection openings 7, which are also formed in the nozzle body 1 and which are directed obliquely downwards in this embodiment.
  • the first pressure chamber 2 is connected via a first inlet bore 37 with a gas line 42, which in turn opens into a gas tank 39, so that the first pressure chamber 2 can be filled with a first fuel in the form of a combustible gas.
  • the hollow nozzle needle 4 is sealingly guided in a guide bore 8 within the nozzle body 1, wherein between the wall of the guide bore 8 and the nozzle hollow needle 4, a throttle gap 9 remains sufficiently large to ensure the longitudinal movement of the hollow nozzle needle 4.
  • the throttle gap 9 opens into a second pressure chamber 15 which is likewise formed in the nozzle body 2 and which surrounds the nozzle hollow needle 4 at its circumference.
  • a longitudinal bore 5 is formed, in which a nozzle needle 10 is arranged longitudinally displaceable.
  • the nozzle needle 10 is guided in a guide portion 13 within the longitudinal bore 5 and cooperates with its the injection ports 7 facing the end with an inner nozzle seat 11 and opens and closes by their longitudinal movement so o or more injection openings 12 which are formed in the hollow needle needle 4.
  • a gap 14 which, as described below, is filled with a second combustion chamber.
  • the guide section 13 is configured in such a way that a flow of the second fuel within the intermediate space 14 in the direction of the injection openings 12 is possible, without there being any appreciable drifting in the region of the guide section 13.
  • the nozzle needle 10 is guided in a second guide section 113 within the hollow nozzle needle 4, which is located at the end of the nozzle needle 10 facing away from the injection openings 12.
  • the hollow nozzle needle 4 For longitudinal movement of the hollow nozzle needle 4, this goes over at its end facing away from the injection openings 7 in a magnet armature 18.
  • the magnet armature 18 is located opposite an electromagnet 19, which exerts an attractive force on the magnet armature 18 when energized and pulls it away from the injection openings 7.
  • a sealing portion 16, which is located below the injection openings 7, is designed so that only a very narrow gap at this point between the hollow nozzle needle 4 and the nozzle body 1 remains, so that the fuel from the first pressure chamber 2 exclusively o- practically exclusively exits through the injection openings 7.
  • the control of the longitudinal movement of the nozzle needle 10 is servo-hydraulic, as it has long been known in the field of fuel injection technology.
  • the nozzle needle 10 is guided with its injection openings 12 facing away from the end in a valve body 22 so that a control chamber 23 is limited by the valve body 22 and the injection openings 12 remote from the end of the nozzle needle 10, in which an alternating fuel pressure is adjustable.
  • the control chamber 23 can be filled with fuel at high pressure via an inlet throttle 24, wherein this fuel in the injection valve shown here is the second fuel, which is preferably liquid.
  • This fuel will come from a Tank 30 and provided via a high-pressure pump 31, which compresses the second fuel and promotes via a high-pressure line 27 to the inlet throttle 24 through which the second fuel enters the control chamber 23.
  • the fuel pressure in the control chamber 23 generates a closing force on the nozzle needle 10 in the direction of the inner nozzle seat 11, so that the nozzle needle 10 is held in contact with the nozzle seat 11, as long as the fuel pressure in the control chamber 23 is large enough. If the nozzle needle 10 is to be moved, the fuel pressure in the control chamber 23 is reduced by opening a control valve 26, which opens a connection to the fuel tank via a drain line 28 via an outlet throttle 25.
  • a high-pressure bore 34 For supplying the second fuel in the intermediate space 14 is a high-pressure bore 34 within the nozzle body 1, which is connected to the high-pressure line 27 and which opens into the second pressure chamber 15.
  • a branching of the high-pressure bore 34 opens into an annular space 35 which surrounds the hollow nozzle needle 4 at its circumference.
  • a transverse bore 36 in the intermediate space 14 From the annular space 35 is a transverse bore 36 in the intermediate space 14, so that the gap 14 is always flooded with fuel under high pressure, which can be injected via the injection openings 12 ultimately in a combustion chamber of an internal combustion engine.
  • a sealing element 40 is provided in the second pressure chamber 15, which is designed here as a circumferential sealing lip and surrounds the nozzle hollow needle 4 at its circumference.
  • a material-tight connection is provided, for example a Weld 41.
  • the sealing body 40 is preferably formed of metal.
  • the sealing body 40 has at its outer edge a sealing edge 43 which rests on a conical sealing seat 44 which is formed within the second pressure chamber 15.
  • the sealing lip 40 is designed to be flexible and arranged so that it is resiliently biased by its installation position and thereby pressed with a force against the sealing seat 44.
  • This fuel pressure presses on the sealing body 40 and thus the sealing edge 43 against the sealing seat 44, which further improves the seal, so that a mixing of the two fuels in the first pressure chamber 2 and in the second combustion chamber 15 is effectively avoided.
  • the control of the hollow nozzle needle 4 and the nozzle needle 10 can also be done in other ways than shown here.
  • the hollow nozzle needle 4 can be controlled servo-hydraulic, i.
  • the inner nozzle needle 10 By the alternating pressure in a control chamber in its longitudinal direction to be moved, as in the embodiment shown here, the inner nozzle needle 10.
  • a further throttle gap in the region of the second guide 113 is formed. Also via this second guide 113, fuel flows from the intermediate space 14 into a low-pressure space 17, which is indicated in the figure by a dashed border line.
  • the low-pressure space 17 is always kept at a low pressure by being connected to the tank 30 via a low-pressure line, so that the second fuel exiting via the further guide section 113 is discharged back into the tank 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to an injection valve for metering two fuels, comprising a nozzle body (1), in which a nozzle hollow needle (4) is arranged for longitudinal sliding, which nozzle hollow needle interacts with an outer nozzle seat (6) in order to open and close an injecting opening (7) for a first fuel. Furthermore, a nozzle needle (10) is arranged in the nozzle hollow needle (4) for longitudinal sliding, which nozzle needle interacts with an inner nozzle seat (11) formed in the nozzle hollow needle (4) in order to open and close an injection opening (12). The nozzle hollow needle (4) is guided in the nozzle body (1) in such a way that a throttle gap (9) is formed. A first pressure chamber (2) is formed between the throttle gap (9) and the outer nozzle seat (6). The first pressure chamber surrounds the nozzle hollow needle (4) and can be filled with a first fuel. A second pressure chamber (15) can be filled with a second fuel. An end region of the nozzle hollow needle (4) remote from the outer nozzle seat (6) protrudes into the second pressure chamber. A peripheral seal body (40) is formed on the nozzle hollow needle (4). Said seal body interacts with a sealing seat (44) and thereby seals off the second pressure chamber (15) in the direction toward the throttle gap (9).

Description

Beschreibung  description
Titel title
Einspritzventil zur Zumessung von zwei Brennstoffen  Injection valve for the metering of two fuels
Die Erfindung betrifft ein Einspritzventil zur Zumessung von zwei Brennstoffen, wie es beispielsweise zur Einbringung dieser Brennstoffe in den Brennraum einer Brennkraftmaschine dient. The invention relates to an injection valve for the metering of two fuels, as used for example for introducing these fuels into the combustion chamber of an internal combustion engine.
Stand der Technik State of the art
Aus dem Stand der Technik sind Einspritzventile und entsprechende Vorrichtungen zur Einbringung von zwei verschiedenen Brennstoffen, beispielsweise in den Brennraum einer Brennkraftmaschine, bekannt. So sind Einspritzventile bekannt, die zum einen einen gasförmigen Kraftstoff und zum anderen einen flüssigen Kraftstoff, beispielsweise Dieselkraftstoff, in einen Brennraum einbringen können. Auf diese Weise kann eine Zündung des Brennstoff-Luft-Gemisches durch den flüssigen Kraftstoff erfolgen, während die Hauptenergiemenge über den gasförmigen Kraftstoff zugeführt wird, so dass auf eine Fremdzündung verzichtet werden kann. Ein solches Brennstoffeinspritzventil ist beispielsweise aus der DE 10 2014 225 167 AI bekannt. Dieses Einspritzventil weist ein Gehäuse auf, in dem eine äußere Düsennadel und eine innere Düsennadel geführt sind, wobei die innere Düsennadel in der äußeren Düsennadel angeordnet ist. Die äußere Düsennadel wirkt mit einem äußeren Düsensitz zum Öffnen und Schließen einer oder mehrerer Eindüsöffnungen zusammen, über die beispielsweise ein gasförmiger Kraftstoff ausgedüst werden kann. Die innere Düsennadel wirkt mit einem im Inneren der äußeren Düsennadel ausgebildeten Düsensitz zum Öffnen und Schließen einer oder mehrerer Einspritzöffnungen zusammen, über die der flüssige Kraftstoff eingespritzt werden kann. Beide Düsennadeln lassen sich unabhängig voneinander, beispielsweise über servo-hydraulische Ventile, in Längsrichtung bewegen, so dass sowohl der äußere Düsensitz als auch der innere Düsensitz unabhängig voneinander geöffnet und geschlossen werden können. Mit einem solchen Einspritzventil ist es so möglich, eine Zündmenge an flüssigem Brennstoff durch Bewegen der inneren Düsennadel einzubringen und anschließend eine größere Menge an gasförmigem Brennstoff durch das Bewegen der äußeren Düsennadel, die den Hauptteil der Verbrennungsenergie beiträgt. Injectors and corresponding devices for introducing two different fuels, for example into the combustion chamber of an internal combustion engine, are known from the prior art. Thus, injection valves are known, which can introduce a gaseous fuel on the one hand and on the other hand, a liquid fuel, such as diesel fuel in a combustion chamber. In this way, an ignition of the fuel-air mixture can be carried out by the liquid fuel, while the main amount of energy is supplied via the gaseous fuel, so that can be dispensed with a spark ignition. Such a fuel injection valve is known for example from DE 10 2014 225 167 AI. This injection valve has a housing in which an outer nozzle needle and an inner nozzle needle are guided, wherein the inner nozzle needle is arranged in the outer nozzle needle. The outer nozzle needle cooperates with an outer nozzle seat for opening and closing one or more injection openings through which, for example, a gaseous fuel can be emptied. The inner nozzle needle cooperates with a nozzle seat formed in the interior of the outer nozzle needle for opening and closing one or more injection openings, via which the liquid fuel can be injected. Both nozzle needles can be independently, for example via servo-hydraulic valves, in the longitudinal direction move so that both the outer nozzle seat and the inner nozzle seat can be opened and closed independently. With such an injection valve, it is possible to introduce an ignition amount of liquid fuel by moving the inner nozzle needle and then a larger amount of gaseous fuel by moving the outer nozzle needle, which contributes the majority of the combustion energy.
Beide Düsennadeln sind geführt, wobei über diese Führungen eine Abdichtung zwischen dem gasförmigen und dem flüssigen Brennstoff erfolgen muss. Diese Abdichtung ist nicht absolut dicht, so dass flüssiger Brennstoff in den gasförmigen eindringen kann und gegebenenfalls auch umgekehrt, abhängig von den Führungen und abhängig von dem jeweiligen Druck der Brennstoffe. Eine solche Mischung der Brennstoffe kann zu Problemen bei der Verbrennung führen, da flüssiger Brennstoff, der über die für den gasförmigen Brennstoff vorgesehenen Eindüsöffnungen ausgebracht wird, nur schlecht zerstäubt wird und dadurch zu einer schlechten Verbrennung innerhalb des Brennraums führt. Both nozzle needles are guided, which must be done via these guides a seal between the gaseous and the liquid fuel. This seal is not absolutely leakproof, so that liquid fuel can penetrate into the gaseous and possibly vice versa, depending on the guides and depending on the particular pressure of the fuels. Such a mixture of the fuels can lead to problems in the combustion, since liquid fuel which is discharged through the provided for the gaseous fuel injection openings, is poorly atomized and thereby leads to a poor combustion within the combustion chamber.
Vorteile der Erfindung Advantages of the invention
Das erfindungsgemäße Einspritzventil mit den Merkmalen des Patentanspruchs 1 weist demgegenüber den Vorteil auf, dass beide Brennstoffe innerhalb des Einspritzventils sicher gegeneinander abgedichtet werden können, ohne dass dafür große bauliche Änderungen erforderlich wären. Zu diesem Zweck weist das Ein- spritzventil zur Zumessung von zwei Brennstoffen einen Düsenkörper auf, in dem eine Düsenhohlnadel längsverschiebbar angeordnet ist, die mit einem äußeren Düsensitz zum Öffnen und Schließen einer Eindüsöffnung für einen ersten Brennstoff zusammenwirkt. Darüber hinaus ist eine Düsennadel vorhanden, die längsverschiebbar in der Düsenhohlnadel angeordnet ist und die mit einem in der Düsenhohlnadel ausgebildeten inneren Düsensitz zum Öffnen und Schließen einer Einspritzöffnung zusammenwirkt, wobei die Düsenhohlnadel im Düsenkörper unter Ausbildung eines Drosselspalts geführt ist. Ein erster, die Düsenhohlnadel umgebender Druckraum ist mit einem ersten Brennstoff befüllbar und ein zweiter Druckraum mit einem zweiten Brennstoff, wobei die Düsennadel mit einem dem äußeren Düsensitz abgewandten Endbereich in den zweiten Druckraum ragt. An der Düsenhohlnadel ist ein umlaufender Dichtungskörper angeordnet, der mit einem Dichtsitz zusammenwirkt und dadurch den zweiten Druckraum in Richtung des Drosselspalts abdichtet. The injection valve according to the invention with the features of claim 1 has the advantage that both fuels can be safely sealed against each other within the injector without major structural changes would be required. For this purpose, the injection valve for metering two fuels has a nozzle body in which a hollow nozzle needle is arranged to be longitudinally displaceable, which cooperates with an outer nozzle seat for opening and closing an injection opening for a first fuel. In addition, a nozzle needle is provided, which is arranged longitudinally displaceable in the hollow nozzle needle and which cooperates with a nozzle hollow needle formed in the inner nozzle seat for opening and closing an injection port, wherein the hollow needle nozzle is guided in the nozzle body to form a throttle gap. A first, the nozzle hollow needle surrounding pressure chamber can be filled with a first fuel and a second pressure chamber with a second fuel, wherein the nozzle needle protrudes with an outer nozzle seat facing away from the end region into the second pressure chamber. On the nozzle hollow needle, a circumferential sealing body is arranged, which cooperates with a sealing seat and thereby seals the second pressure chamber in the direction of the throttle gap.
Durch den umlaufenden Dichtungskörper wird der Drosselspalt, der zwangsläufig zwischen dem ersten und zweiten Druckraum ausgebildet ist, abgedichtet werden, so dass durch diesen Drosselspalt kein Brennstoff vom ersten in den zweiten Druckraum oder vom zweiten in den ersten Druckraum gelangen kann. Damit bleiben beide Kraftstoff innerhalb des Einspritzventils getrennt und die Funktion wird nicht beeinträchtigt. By the peripheral sealing body of the throttle gap, which is necessarily formed between the first and second pressure chamber, are sealed, so that through this throttle gap no fuel from the first to the second pressure chamber or from the second can reach into the first pressure chamber. This keeps both fuel within the injector separate and does not affect the function.
In einer ersten vorteilhaften Ausgestaltung ist der Dichtungskörper vom Druck im zweiten Druckraum in Richtung des Dichtsitzes beaufschlagt, wodurch eine zusätzliche Dichtungswirkung erreicht wird. Da bei Einspritzventilen, die zwei verschiedene Brennstoffe eindosieren können, zumeist einer der Brennstoffe unter einem höheren Druck zur Verfügung gestellt wird als der andere, lässt sich im zweiten Druckraum der Kraftstoff mit dem höheren Druck vorhalten, so dass eine starke Dichtungskraft auf den Dichtungskörper ausgeübt und damit eine entsprechend sichere Abdichtung erreicht wird. In a first advantageous embodiment of the sealing body is acted upon by the pressure in the second pressure chamber in the direction of the sealing seat, whereby an additional sealing effect is achieved. Since injectors, which can meter two different fuels, usually one of the fuels is provided under a higher pressure than the other, can be in the second pressure chamber, the fuel with the higher pressure hold, so that a strong sealing force exerted on the seal body and so that a correspondingly secure seal is achieved.
In einer weiteren vorteilhaften Ausgestaltung ist der Dichtungskörper als an der Düsenhohlnadel befestigte Dichtlippe ausgebildet, die federnd ausgebildet ist. Damit wird die Dichtlippe entsprechend flexibel, so dass sie beispielsweise durch den Druck im zweiten Druckraum allseitig gegen den Dichtsitz gedrückt wird. In a further advantageous embodiment of the sealing body is formed as attached to the nozzle hollow needle sealing lip, which is resilient. Thus, the sealing lip is correspondingly flexible, so that it is pressed for example by the pressure in the second pressure chamber on all sides against the sealing seat.
Der Dichtungskörper ist vorzugsweise aus Metall gefertigt, um die notwendige Flexibilität einerseits und eine ausreichende Druckbeständigkeit gegenüber dem Druck im zweiten Druckraum andererseits zu erreichen. Dabei ist der Dichtungskörper mit der Düsenhohlnadel fest verbunden, vorzugsweise verschweißt, damit auch zwischen dem Dichtungskörper und der Düsenhohlnadel eine sichere Abdichtung erreicht wird. The sealing body is preferably made of metal in order to achieve the necessary flexibility on the one hand and a sufficient pressure resistance to the pressure in the second pressure chamber on the other. In this case, the sealing body with the hollow nozzle needle is firmly connected, preferably welded, so that a secure seal is achieved between the seal body and the hollow needle nozzle.
In einer weiteren vorteilhaften Ausgestaltung ist die Einspritzöffnung in der Düsenhohlnadel ausgebildet, wobei natürlich auch mehrere Einspritzöffnungen vor- gesehen sein können. Die Ausbildung der Einspritzöffnungen in der Düsenhohlnadel ist einfacher zu realisieren als in einem komplexen Düsenkörper, da die Zugänglichkeit für Werkzeuge verbessert ist. In a further advantageous embodiment, the injection opening is formed in the nozzle hollow needle, wherein, of course, also several injection openings can be seen. The formation of the injection openings in the hollow needle nozzle is easier to implement than in a complex nozzle body, since the accessibility for tools is improved.
Besonders vorteilhaft ist das oben geschilderte Einspritzventil dann, wenn der erste Brennstoff gasförmig und der zweite Brennstoff flüssig ist. Particularly advantageous is the above-described injection valve when the first fuel is gaseous and the second fuel is liquid.
Zeichnung drawing
In der Zeichnung ist ein erfindungsgemäßes Einspritzventil schematisch im Längsschnitt dargestellt. In the drawing, an injection valve according to the invention is shown schematically in longitudinal section.
Beschreibung des Ausführungsbeispiels Description of the embodiment
In Figur 1 ist ein erfindungsgemäßes Einspritzventil im Längsschnitt schematisch dargestellt. Das Einspritzventil weist einen Düsenkörper 1 auf, in dem ein erster Druckraum 2 ausgebildet ist, in dem eine Düsenhohlnadel 4 längsverschiebbar angeordnet ist. Die Düsenhohlnadel 4 wirkt mit einem äußeren Düsensitz 6 zum Öffnen und Schließen einer oder mehrerer Eindüsöffnungen 7 zusammen, die ebenfalls im Düsenkörper 1 ausgebildet sind und die in diesem Ausführungsbeispiel schräg nach unten gerichtet sind. Der erste Druckraum 2 ist über eine erste Zulaufbohrung 37 mit einer Gasleitung 42 verbunden, die ihrerseits in einen Gastank 39 mündet, so dass der erste Druckraum 2 mit einem ersten Brennstoff in Form eines brennbaren Gases befüllt werden kann. Die Düsenhohlnadel 4 wird in einer Führungsbohrung 8 innerhalb des Düsenkörpers 1 dichtend geführt, wobei zwischen der Wand der Führungsbohrung 8 und der Düsenhohlnadel 4 ein Drosselspalt 9 verbleibt, der ausreichend groß dimensioniert ist, um die Längsbeweglichkeit der Düsenhohlnadel 4 zu gewährleisten. Der Drosselspalt 9 mündet in einen zweiten Druckraum 15, der ebenfalls im Düsenkörper 2 ausgebildet ist und der die Düsenhohlnadel 4 an ihrem Umfang umgibt. In Figure 1, an injection valve according to the invention is shown schematically in longitudinal section. The injection valve has a nozzle body 1, in which a first pressure chamber 2 is formed, in which a hollow nozzle needle 4 is arranged to be longitudinally displaceable. The hollow nozzle needle 4 cooperates with an outer nozzle seat 6 for opening and closing one or more injection openings 7, which are also formed in the nozzle body 1 and which are directed obliquely downwards in this embodiment. The first pressure chamber 2 is connected via a first inlet bore 37 with a gas line 42, which in turn opens into a gas tank 39, so that the first pressure chamber 2 can be filled with a first fuel in the form of a combustible gas. The hollow nozzle needle 4 is sealingly guided in a guide bore 8 within the nozzle body 1, wherein between the wall of the guide bore 8 and the nozzle hollow needle 4, a throttle gap 9 remains sufficiently large to ensure the longitudinal movement of the hollow nozzle needle 4. The throttle gap 9 opens into a second pressure chamber 15 which is likewise formed in the nozzle body 2 and which surrounds the nozzle hollow needle 4 at its circumference.
Im Inneren der Düsenhohlnadel 4 ist eine Längsbohrung 5 ausgebildet, in der eine Düsennadel 10 längsverschiebbar angeordnet ist. Die Düsennadel 10 wird in einem Führungsabschnitt 13 innerhalb der Längsbohrung 5 geführt und wirkt mit ihrem den Eindüsöffnungen 7 zugewandten Ende mit einem inneren Düsensitz 11 zusammen und öffnet und schließt durch ihre Längsbewegung so eine o- der mehrere Einspritzöffnungen 12, die in der Düsenhohlnadel 4 ausgebildet sind. Zwischen der Düsennadel 10 und der Düsenhohlnadel 4 verbleibt ein Zwischenraum 14, der wie weiter unten noch geschildert, mit einem zweiten Brennraum gefüllt ist. Der Führungsabschnitt 13 ist so ausgestaltet, dass eine Strömung des zweiten Brennstoffs innerhalb des Zwischenraums 14 in Richtung der Einspritzöffnungen 12 möglich ist, ohne dass es zu einer nennenswerten Drosse- lung im Bereich des Führungsabschnitts 13 kommt. Die Düsennadel 10 ist darüber hinaus in einem zweiten Führungsabschnitt 113 innerhalb der Düsenhohlnadel 4 geführt, der sich an dem den Einspritzöffnungen 12 abgewandten Ende der Düsennadel 10 befindet. Inside the hollow nozzle needle 4, a longitudinal bore 5 is formed, in which a nozzle needle 10 is arranged longitudinally displaceable. The nozzle needle 10 is guided in a guide portion 13 within the longitudinal bore 5 and cooperates with its the injection ports 7 facing the end with an inner nozzle seat 11 and opens and closes by their longitudinal movement so o or more injection openings 12 which are formed in the hollow needle needle 4. Between the nozzle needle 10 and the nozzle hollow needle 4 remains a gap 14 which, as described below, is filled with a second combustion chamber. The guide section 13 is configured in such a way that a flow of the second fuel within the intermediate space 14 in the direction of the injection openings 12 is possible, without there being any appreciable drifting in the region of the guide section 13. In addition, the nozzle needle 10 is guided in a second guide section 113 within the hollow nozzle needle 4, which is located at the end of the nozzle needle 10 facing away from the injection openings 12.
Zur Längsbewegung der Düsenhohlnadel 4 geht diese an ihrem den Eindüsöffnungen 7 abgewandten Ende in einen Magnetanker 18 über. Der Magnetanker 18 liegt einem Elektromagneten 19 gegenüber, der bei Bestromung eine anziehende Kraft auf den Magnetanker 18 ausübt und diesen von den Eindüsöffnungen 7 wegzieht. Dadurch bewegt sich die Düsenhohlnadel 4 vom äußeren Düsensitz 6 weg und gibt einen Strömungsquerschnitt aus dem ersten Druckraum 2 in Richtung der Eindüsöffnungen 7 frei. Ein Dichtabschnitt 16, der sich unterhalb der Eindüsöffnungen 7 befindet, ist so ausgestaltet, dass nur ein sehr enger Spalt an dieser Stelle zwischen der Düsenhohlnadel 4 und dem Düsenkörper 1 verbleibt, so dass der Brennstoff aus dem ersten Druckraum 2 ausschließlich o- der praktisch ausschließlich über die Eindüsöffnungen 7 austritt. For longitudinal movement of the hollow nozzle needle 4, this goes over at its end facing away from the injection openings 7 in a magnet armature 18. The magnet armature 18 is located opposite an electromagnet 19, which exerts an attractive force on the magnet armature 18 when energized and pulls it away from the injection openings 7. As a result, the hollow nozzle needle 4 moves away from the outer nozzle seat 6 and releases a flow cross section from the first pressure chamber 2 in the direction of the injection openings 7. A sealing portion 16, which is located below the injection openings 7, is designed so that only a very narrow gap at this point between the hollow nozzle needle 4 and the nozzle body 1 remains, so that the fuel from the first pressure chamber 2 exclusively o- practically exclusively exits through the injection openings 7.
Die Steuerung der Längsbewegung der Düsennadel 10 erfolgt servo-hydraulisch, wie es im Bereich der Kraftstoffeinspritztechnik seit langer Zeit bekannt ist. Dazu ist die Düsennadel 10 mit ihrem den Einspritzöffnungen 12 abgewandten Ende in einem Ventilkörper 22 geführt, so dass durch den Ventilkörper 22 und das den Einspritzöffnungen 12 abgewandte Ende der Düsennadel 10 ein Steuerraum 23 begrenzt wird, in dem ein wechselnder Kraftstoffdruck einstellbar ist. Der Steuerraum 23 ist über eine Zulaufdrossel 24 mit Kraftstoff unter hohem Druck befüll- bar, wobei dieser Kraftstoff in dem hier gezeigten Einspritzventil der zweite Brennstoff ist, der vorzugsweise flüssig ist. Dieser Brennstoff wird aus einem Tank 30 und über eine Hochdruckpumpe 31 zur Verfügung gestellt, die den zweiten Brennstoff verdichtet und über eine Hochdruckleitung 27 zur Zulaufdrossel 24 fördert, durch die der zweite Brennstoff in den Steuerraum 23 gelangt. Der Brennstoffdruck im Steuerraum 23 erzeugt eine Schließkraft auf die Düsennadel 10 in Richtung des inneren Düsensitzes 11, so dass die Düsennadel 10 in Anlage an Düsensitz 11 gehalten wird, solange der Brennstoffdruck im Steuerraum 23 groß genug ist. Soll die Düsennadel 10 bewegt werden, so wird der Kraftstoffdruck im Steuerraum 23 vermindert, indem ein Steuerventil 26 geöffnet wird, das über eine Ablaufdrossel 25 eine Verbindung zum Kraftstofftank über eine Ablaufleitung 28 öffnet. Dadurch sinkt der Druck im Steuerraum 23 und die Düsennadel 10 wird durch den Kraftstoffdruck im Zwischenraum 14 in Längsrichtung weg vom inneren Düsensitz 11 bewegt. Wird das Steuerventil 26 wieder geschlossen, so baut sich der hohe Brennstoffdruck im Steuerraum 23 erneut auf und drückt die Düsennadel 10 zurück in ihre Schließstellung. The control of the longitudinal movement of the nozzle needle 10 is servo-hydraulic, as it has long been known in the field of fuel injection technology. For this purpose, the nozzle needle 10 is guided with its injection openings 12 facing away from the end in a valve body 22 so that a control chamber 23 is limited by the valve body 22 and the injection openings 12 remote from the end of the nozzle needle 10, in which an alternating fuel pressure is adjustable. The control chamber 23 can be filled with fuel at high pressure via an inlet throttle 24, wherein this fuel in the injection valve shown here is the second fuel, which is preferably liquid. This fuel will come from a Tank 30 and provided via a high-pressure pump 31, which compresses the second fuel and promotes via a high-pressure line 27 to the inlet throttle 24 through which the second fuel enters the control chamber 23. The fuel pressure in the control chamber 23 generates a closing force on the nozzle needle 10 in the direction of the inner nozzle seat 11, so that the nozzle needle 10 is held in contact with the nozzle seat 11, as long as the fuel pressure in the control chamber 23 is large enough. If the nozzle needle 10 is to be moved, the fuel pressure in the control chamber 23 is reduced by opening a control valve 26, which opens a connection to the fuel tank via a drain line 28 via an outlet throttle 25. As a result, the pressure in the control chamber 23 drops and the nozzle needle 10 is moved away from the inner nozzle seat 11 in the longitudinal direction by the fuel pressure in the intermediate space 14. When the control valve 26 is closed again, the high fuel pressure in the control chamber 23 builds up again and pushes the nozzle needle 10 back into its closed position.
Zur Zuführung des zweiten Brennstoffs in den Zwischenraum 14 dient eine Hochdruckbohrung 34 innerhalb des Düsenkörpers 1, die mit der Hochdruckleitung 27 verbunden ist und die in den zweiten Druckraum 15 mündet. Darüber hinaus mündet eine Abzweigung der Hochdruckbohrung 34 in einen Ringraum 35, der die Düsenhohlnadel 4 an ihrem Umfang umgibt. Vom Ringraum 35 geht eine Querbohrung 36 in den Zwischenraum 14, so dass der Zwischenraum 14 stets mit Kraftstoff unter hohem Druck geflutet ist, der über die Einspritzöffnungen 12 letztlich in einen Brennraum einer Brennkraftmaschine eingespritzt werden kann. For supplying the second fuel in the intermediate space 14 is a high-pressure bore 34 within the nozzle body 1, which is connected to the high-pressure line 27 and which opens into the second pressure chamber 15. In addition, a branching of the high-pressure bore 34 opens into an annular space 35 which surrounds the hollow nozzle needle 4 at its circumference. From the annular space 35 is a transverse bore 36 in the intermediate space 14, so that the gap 14 is always flooded with fuel under high pressure, which can be injected via the injection openings 12 ultimately in a combustion chamber of an internal combustion engine.
Ohne weitere Maßnahmen würde der Drosselspalt 9 den ersten Druckraum 2 und dem zweiten Druckraum 15 verbinden. Da der zweite, flüssige Brennstoff im zweiten Druckraum 15 zumeist unter einem höheren Druck anliegt als der gasförmige, erste Brennstoff im ersten Druckraum 2, käme es zu einer stetigen, wenn auch geringen Strömung des zweiten Brennstoffs über den Drosselspalt 9 vom ersten Druckraum 15 in den ersten Druckraum 2. Um dies zu verhindern, ist im zweiten Druckraum 15 ein Dichtungselement 40 vorgesehen, das hier als umlaufende Dichtlippe ausgebildete ist und das die Düsenhohlnadel 4 an ihrem Umfang umgibt. Zur Abdichtung zwischen dem Dichtelement 40 und der Düsenhohlnadel 4 ist eine stoffdichte Verbindung vorgesehen, beispielsweise eine Schweißnaht 41. Dazu ist der Dichtungskörper 40 vorzugsweise aus Metall ausgebildet. Der Dichtungskörper 40 weist an seinem äußeren Rand eine Dichtkante 43 auf, die auf einem konischen Dichtsitz 44, der innerhalb des zweiten Druckraums 15 ausgebildet ist, anliegt. Dabei ist die Dichtlippe 40 flexibel gestaltet und so angeordnet, dass sie durch ihre Einbaulage elastische vorgespannt und dadurch mit einer Kraft gegen den Dichtsitz 44 gedrückt wird. Zur besseren Abdichtung dient auch der Effekt, dass im zweiten Druckraum 15 stets ein hoher Brennstoffdruck anliegt. Dieser Brennstoffdruck drückt auf den Dichtungskörper 40 und damit die Dichtkante 43 gegen den Dichtsitz 44, was die Abdichtung weiter verbessert, so dass eine Vermischung der beiden Brennstoffe im ersten Druckraum 2 und im zweiten Brennraum 15 wirkungsvoll vermieden wird. Without further action, the throttle gap 9 would connect the first pressure chamber 2 and the second pressure chamber 15. Since the second, liquid fuel in the second pressure chamber 15 is usually under a higher pressure than the gaseous, first fuel in the first pressure chamber 2, there would be a steady, albeit small flow of the second fuel through the throttle gap 9 from the first pressure chamber 15 in the To prevent this, a sealing element 40 is provided in the second pressure chamber 15, which is designed here as a circumferential sealing lip and surrounds the nozzle hollow needle 4 at its circumference. For sealing between the sealing element 40 and the hollow nozzle needle 4, a material-tight connection is provided, for example a Weld 41. For this purpose, the sealing body 40 is preferably formed of metal. The sealing body 40 has at its outer edge a sealing edge 43 which rests on a conical sealing seat 44 which is formed within the second pressure chamber 15. In this case, the sealing lip 40 is designed to be flexible and arranged so that it is resiliently biased by its installation position and thereby pressed with a force against the sealing seat 44. For better sealing also the effect that in the second pressure chamber 15 is always applied a high fuel pressure. This fuel pressure presses on the sealing body 40 and thus the sealing edge 43 against the sealing seat 44, which further improves the seal, so that a mixing of the two fuels in the first pressure chamber 2 and in the second combustion chamber 15 is effectively avoided.
Die Steuerung der Düsenhohlnadel 4 und der Düsennadel 10 kann auch in anderer Weise geschehen als hier dargestellt. So kann auch die Düsenhohlnadel 4 servo-hydraulisch angesteuert werden, d.h. durch den wechselnden Druck in einem Steuerraum in ihrer Längsrichtung bewegt werden, so wie im hier gezeigten Ausführungsbeispiel die innere Düsennadel 10. Auch ist es umgekehrt möglich, die innere Düsennadel 10 beispielsweise direkt durch einen Magneten zu bewegen. The control of the hollow nozzle needle 4 and the nozzle needle 10 can also be done in other ways than shown here. Thus, the hollow nozzle needle 4 can be controlled servo-hydraulic, i. By the alternating pressure in a control chamber in its longitudinal direction to be moved, as in the embodiment shown here, the inner nozzle needle 10. Also, conversely, it is possible to move the inner nozzle needle 10, for example, directly by a magnet.
Zwischen der Düsennadel 10 und der Düsenhohlnadel 4 ist ein weiterer Drosselspalt im Bereich der zweiten Führung 113 ausgebildet. Auch über diese zweite Führung 113 fließt Kraftstoff aus dem Zwischenraum 14 in einen Niederdruckraum 17, der in der Figur mit einer gestrichelten Umrandungslinie angedeutet ist. Der Niederdruckraum 17 wird stets auf einem niedrigen Druck gehalten, indem er über eine Niederdruckleitung mit dem Tank 30 verbunden ist, so dass der über den weiteren Führungsabschnitt 113 austretende zweite Brennstoff zurück in den Tank 30 abgeführt wird. Between the nozzle needle 10 and the nozzle hollow needle 4, a further throttle gap in the region of the second guide 113 is formed. Also via this second guide 113, fuel flows from the intermediate space 14 into a low-pressure space 17, which is indicated in the figure by a dashed border line. The low-pressure space 17 is always kept at a low pressure by being connected to the tank 30 via a low-pressure line, so that the second fuel exiting via the further guide section 113 is discharged back into the tank 30.

Claims

Ansprüche claims
1. Einspritzventil zur Zumessung von zwei Brennstoffen mit einem Düsenkörper1. injection valve for the metering of two fuels with a nozzle body
(I) , in dem eine Düsenhohlnadel (4) längsverschiebbar angeordnet ist, die mit einem äußeren Düsensitz (6) zum Öffnen und Schließen einer Eindüsöffnung (7) für einen ersten Brennstoff zusammenwirkt, und mit einer Düsennadel (10), die längsverschiebbar in der Düsenhohlnadel (4) angeordnet ist und die mit einem in der Düsenhohlnadel (4) ausgebildeten inneren Düsensitz(I), in which a hollow nozzle needle (4) is arranged longitudinally displaceable, which cooperates with an outer nozzle seat (6) for opening and closing a Eindüsöffnung (7) for a first fuel, and with a nozzle needle (10) longitudinally displaceable in the Nozzle hollow needle (4) is arranged and with an in the hollow needle nozzle (4) formed inner nozzle seat
(II) zum Öffnen und Schließen einer Einspritzöffnung (12) zusammenwirkt, wobei die Düsenhohlnadel (4) im Düsenkörper (1) unter Ausbildung eines Drosselspalts (9) geführt ist, und mit einem ersten, die Düsenhohlnadel (4) umgebenden Druckraum (2), der mit einem ersten Brennstoff befüllbar ist, und mit einem zweiten Druckraum (15), der mit einem zweiten Brennstoff befüllbar ist und in den die Düsenhohlnadel (4) mit einem dem äußeren Düsensitz (6) abgewandten Endbereich ragt, (II) for opening and closing an injection opening (12) cooperates, wherein the hollow nozzle needle (4) in the nozzle body (1) is guided to form a throttle gap (9), and with a first, the hollow nozzle needle (4) surrounding the pressure chamber (2) which can be filled with a first fuel, and with a second pressure chamber (15) which can be filled with a second fuel and into which the hollow nozzle needle (4) protrudes with an end region facing away from the outer nozzle seat (6),
dadurch gekennzeichnet, dass  characterized in that
an der Düsenhohlnadel (4) ein umlaufender Dichtungskörper (40) ausgebildet ist, der mit einem Dichtsitz (44) zusammenwirkt und dadurch den zweiten Druckraum (15) in Richtung des Drosselspalts (9) abdichtet.  on the hollow nozzle needle (4) a circumferential sealing body (40) is formed, which cooperates with a sealing seat (44) and thereby seals the second pressure chamber (15) in the direction of the throttle gap (9).
2. Einspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der Dichtungskörper (40) vom Druck im zweiten Druckraum (15) in Richtung des Dichtsitzes (44) beaufschlagt ist. 2. Injection valve according to claim 1, characterized in that the sealing body (40) from the pressure in the second pressure chamber (15) in the direction of the sealing seat (44) is acted upon.
3. Einspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Dichtungskörper (40) als an der Düsenhohlnadel (4) befestigte Dichtlippe ausgebildet ist, die federnd ausgebildet ist. 3. Injection valve according to claim 1 or 2, characterized in that the sealing body (40) is formed as on the hollow nozzle needle (4) attached to the sealing lip, which is resilient.
4. Einspritzventil nach Anspruch 3, dadurch gekennzeichnet, dass die Dichtlippe (40) einen äußeren, als Dichtkante (43) ausgebildeten Rand aufweist, mit die Dichtlippe (40) mit dem Dichtsitz (44) dichtend zusammenwirkt. 4. Injection valve according to claim 3, characterized in that the sealing lip (40) has an outer, as a sealing edge (43) formed edge, with the sealing lip (40) with the sealing seat (44) sealingly cooperates.
5. Einspritzventil nach Anspruch 4, dadurch gekennzeichnet, dass die Dichtlippe (40) mechanisch so vorgespannt ist, dass die Dichtkante (43) gegen den Dichtsitz (44) gedrückt wird. 5. Injection valve according to claim 4, characterized in that the sealing lip (40) is mechanically biased so that the sealing edge (43) against the sealing seat (44) is pressed.
6. Einspritzventil nach Anspruch 1 oder 3, dadurch gekennzeichnet, dass der Dichtungskörper (40) aus Metall gefertigt ist. 6. Injection valve according to claim 1 or 3, characterized in that the sealing body (40) is made of metal.
7. Einspritzventil nach Anspruch 6, dadurch gekennzeichnet, dass der Dichtungskörper (40) mit der Düsenhohlnadel (4) fest verbunden, vorzugsweise verschweißt, ist. 7. An injector according to claim 6, characterized in that the sealing body (40) with the hollow nozzle needle (4) firmly connected, preferably welded, is.
8. Einspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass die Einspritzöffnung (12) in der Düsenhohlnadel (4) ausgebildet ist. 8. An injection valve according to claim 1, characterized in that the injection opening (12) in the hollow nozzle needle (4) is formed.
9. Einspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der erste Brennstoff gasförmig und der zweite Brennstoff flüssig ist. 9. Injection valve according to claim 1, characterized in that the first fuel is gaseous and the second fuel is liquid.
PCT/EP2017/075216 2017-10-04 2017-10-04 Injection valve for metering two fuels WO2019068321A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201780095549.5A CN111164290B (en) 2017-10-04 2017-10-04 Injection valve for metering two fuels
PCT/EP2017/075216 WO2019068321A1 (en) 2017-10-04 2017-10-04 Injection valve for metering two fuels
DE112017007710.9T DE112017007710A5 (en) 2017-10-04 2017-10-04 INJECTION VALVE FOR MEASURING TWO FUELS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/075216 WO2019068321A1 (en) 2017-10-04 2017-10-04 Injection valve for metering two fuels

Publications (1)

Publication Number Publication Date
WO2019068321A1 true WO2019068321A1 (en) 2019-04-11

Family

ID=60009644

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/075216 WO2019068321A1 (en) 2017-10-04 2017-10-04 Injection valve for metering two fuels

Country Status (3)

Country Link
CN (1) CN111164290B (en)
DE (1) DE112017007710A5 (en)
WO (1) WO2019068321A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2784858C1 (en) * 2022-05-25 2022-11-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Государственный университет морского и речного флота имени адмирала С.О. Макарова" Dual-fuel injector for internal combustion engine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009152602A1 (en) * 2008-06-19 2009-12-23 Westport Power Inc. Dual fuel connector
WO2013096278A1 (en) * 2011-12-23 2013-06-27 Caterpillar Inc. Dual fuel injector having fuel leak seals
US20140034020A1 (en) * 2012-08-03 2014-02-06 Caterpillar Inc. Co-Axial Quill Assembly Retainer And Dual Fuel Common Rail Engine Using Same
WO2014186892A1 (en) * 2013-05-21 2014-11-27 Westport Power Inc. Fuel injector
DE102014225167A1 (en) 2014-12-08 2016-06-09 Robert Bosch Gmbh Fuel metering valve for an internal combustion engine and method for operating the same
WO2017080757A1 (en) * 2015-11-11 2017-05-18 Robert Bosch Gmbh Nozzle assembly for a fuel injection valve for injecting a gaseous and/or liquid fuel, and fuel injection valve
DE102016217009A1 (en) * 2016-09-07 2018-03-08 Robert Bosch Gmbh Injection valve for the metering of two fuels

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19959851C2 (en) * 1999-12-10 2002-07-11 Daimler Chrysler Ag Dual-fuel injector, in particular for internal combustion engines, and injection method
DE10322826A1 (en) * 2003-05-19 2004-12-09 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
DE102016203916A1 (en) * 2016-03-10 2017-09-14 Robert Bosch Gmbh Nozzle assembly for a fuel injection valve for injecting a gaseous and / or liquid fuel, fuel injection valve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009152602A1 (en) * 2008-06-19 2009-12-23 Westport Power Inc. Dual fuel connector
WO2013096278A1 (en) * 2011-12-23 2013-06-27 Caterpillar Inc. Dual fuel injector having fuel leak seals
US20140034020A1 (en) * 2012-08-03 2014-02-06 Caterpillar Inc. Co-Axial Quill Assembly Retainer And Dual Fuel Common Rail Engine Using Same
WO2014186892A1 (en) * 2013-05-21 2014-11-27 Westport Power Inc. Fuel injector
DE102014225167A1 (en) 2014-12-08 2016-06-09 Robert Bosch Gmbh Fuel metering valve for an internal combustion engine and method for operating the same
WO2017080757A1 (en) * 2015-11-11 2017-05-18 Robert Bosch Gmbh Nozzle assembly for a fuel injection valve for injecting a gaseous and/or liquid fuel, and fuel injection valve
DE102016217009A1 (en) * 2016-09-07 2018-03-08 Robert Bosch Gmbh Injection valve for the metering of two fuels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2784858C1 (en) * 2022-05-25 2022-11-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Государственный университет морского и речного флота имени адмирала С.О. Макарова" Dual-fuel injector for internal combustion engine

Also Published As

Publication number Publication date
DE112017007710A5 (en) 2020-03-19
CN111164290A (en) 2020-05-15
CN111164290B (en) 2022-09-09

Similar Documents

Publication Publication Date Title
DE2500644C2 (en) Fuel injection valve for internal combustion engines
DE69704464T2 (en) Injector
EP3353413B1 (en) Device for metering fuel
DE102014225167A1 (en) Fuel metering valve for an internal combustion engine and method for operating the same
DE10300045A1 (en) Inward opening vario nozzle
EP4150201A1 (en) Gas metering valve for internal combustion engines
EP3535486A1 (en) Fuel injection valve for injecting a gaseous and/or liquid fuel
EP2206912B1 (en) Fuel injector
WO2019076524A1 (en) Injector for metering liquid and gaseous fuel
DE19860476A1 (en) Fuel injection system
DE102016217009A1 (en) Injection valve for the metering of two fuels
EP1088985A2 (en) High pressure fuel injector for an internal combustion engine
WO2019068321A1 (en) Injection valve for metering two fuels
DE102015220375A1 (en) fuel injector
DE102004014198B3 (en) Servo valve and injector
DE102017212655A1 (en) Injector for liquid and gaseous fuel
EP3464865A1 (en) Gas valve for dosing gaseous fuels
EP2458194A2 (en) Fuel injector valve for combustion engines
DE19706661A1 (en) Fuel injection valve for internal combustion engines
DE19918226B4 (en) Fuel / air injector
EP2519731A1 (en) Injection valve for a fluid
EP1709321B1 (en) Fuel injection valve for internal combustion engines
DE102007029793A1 (en) Fuel injector for internal combustion engines, has high pressure area extending in axial direction and allows injecting fuel staying below high pressure
DE102018212090A1 (en) Nozzle assembly for a fuel injection valve for injecting a gaseous and / or liquid fuel, fuel injection valve
DE10257895A1 (en) Fuel injection valve for internal combustion engine, has piezoelectric or magnetostrictive actuator opening valve body in nozzle tip and has fuel feed tube running parallel to actuator body

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17778295

Country of ref document: EP

Kind code of ref document: A1

REG Reference to national code

Ref country code: DE

Ref legal event code: R225

Ref document number: 112017007710

Country of ref document: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17778295

Country of ref document: EP

Kind code of ref document: A1