FI20185784A1 - Injection nozzle for a dual fuel engine and dual fuel engine - Google Patents

Injection nozzle for a dual fuel engine and dual fuel engine Download PDF

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Publication number
FI20185784A1
FI20185784A1 FI20185784A FI20185784A FI20185784A1 FI 20185784 A1 FI20185784 A1 FI 20185784A1 FI 20185784 A FI20185784 A FI 20185784A FI 20185784 A FI20185784 A FI 20185784A FI 20185784 A1 FI20185784 A1 FI 20185784A1
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FI
Finland
Prior art keywords
injection
nozzle
fuel
liquid fuel
apertures
Prior art date
Application number
FI20185784A
Other languages
Finnish (fi)
Swedish (sv)
Inventor
Armin Weber
Robert Meier
Original Assignee
Man Energy Solutions Se
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Filing date
Publication date
Application filed by Man Energy Solutions Se filed Critical Man Energy Solutions Se
Publication of FI20185784A1 publication Critical patent/FI20185784A1/en

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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • 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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • 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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1826—Discharge orifices having different sizes
    • 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

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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)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

An injection nozzle (23) for a cylinder (2) of a dual fuel engine, wherein via the injection nozzle (23) in a liquid fuel operating mode, liquid fuel and in a gas fuel operating mode, ignition fluid is introducible into a combustion chamber (9) of the cylinder (2), wherein the injection nozzles (23) comprises an (injection) nozzle body (24) with first injection orifices (25) and second injection orifices (26) as well as an (injection) nozzle needle (27) that is displaceably guided in the (injection) nozzle body (24), wherein the relative position between the (injection) nozzle needle (27) and the (injection) nozzle body (24) determines the injection orifices (25, 26) via which in the liquid fuel operating mode the liquid fuel and in the gas fuel operating mode the ignition fluid is introducible into the combustion chamber (9) of the cylinder (2).

Description

INJECTION NOZZLE FOR A DUAL FUEL ENGINE AND DUAL FUEL
ENGINE
The invention relates to an injection nozzle for a dual fuel engine and to a dual fuel engine.
From practice, dual fuel engines are known, in which on the one hand a liquid, ignitable fuel such as diesel and on the other hand a gaseous-low ignitable fuel such as natural gas can be combusted. In the gas mode of a dual fuel engine, a lean gas-air mixture is generally introduced into the cylinders of the engine and ignited by the ignition energy or ignition fluid likewise introduced into the cylinders.
In Fig. 1, assemblies of a dual fuel engine 1 known from the prior art are shown, wherein Fig. 1 shows a cylinder 2 of such a dual fuel engine 1. The cylinder 2 comprises a cylinder head 3. In the cylinder 2, a piston 4, which is guided by a connecting rod 5, moves up and down. In the cylinder head 3, an injection nozzle 6 is mounted, through which liquid fuel, in particular diesel fuel, can be injected via a fuel line
20185784 prh 20 -09- 2018 from a fuel pump 8 into a combustion chamber 9 of the cylinder 2. The injection nozzle 6, the fuel line 7 and the fuel pump 8 are elements of a fuel feeding device which serves for feeding liquid fuel into the combustion chamber 9 of the cylinder 2. This fuel feeding device is active in particular when in the cylinder 2 of the dual fuel engine in a liquid fuel operating mode liquid fuel, in particular diesel, is combusted as fuel. For combusting the liquid fuel, charge air then can be additionally introduced into the respective cylinder 2 of the dual fuel engine 1 via an inlet valve 17 wherein exhaust gas 15 generated during the combustion of the fuel can be discharged from the respective cylinder 2 of the dual fuel engine 1 via an exhaust valve 18.
20185784 prh 20 -09- 2018
In the combustion chamber 9 of the cylinder 2 of the dual fuel engine 1, gas can be alternatively combusted as fuel in another operating mode, in a gas fuel operating mode. To this end, the dual fuel engine 1 comprises a mixture forming unit 20, in which a mixture of combustion air 10 and gas, which is provided to the mixture forming unit 20 via a gas supply line 21, is formed, wherein this gas-air mixture is introduced into the combustion chamber 9 of the cylinder 2 via the inlet valve 17. During the combustion of the gas, exhaust gas 15 is also generated, which can be discharged from the cylinder 2 via the exhaust valve 18. Ignition fluid, which can be introduced into a further combustion chamber 11 of the cylinder 2 with the help of an ignition fluid injector 13 serves for igniting the gas-air mixture in the gas mode of the dual fuel engine 1, wherein this further combustion chamber 11 of the cylinder 2 is coupled to the combustion chamber 9 via at least one connecting passage 12. Alternatively, the ignition fluid can also be directly introduced into the combustion chamber 9. The ignition fluid injector 13 of the cylinder 2 shown in Fig. 1 is part of an ignition fluid injection system of the dual fuel engine 1, wherein the ignition fluid injection system for each cylinder 2 of the dual fuel engine 1 comprises an individual ignition fluid injector 13. The ignition fluid injectors 13 are suppliable with ignition fluid via an ignition fluid line 14 emanating from a common ignition fluid storage unit 22 of the ignition fluid injection system, wherein the ignition fluid storage unit 22 is assigned an ignition fluid feed pump 16, which supplies the ignition fluid storage unit 22 with ignition fluid. The ignition fluid feed pump 16 can be an electrically operated high-pressure pump. The ignition fluid feed pump 16 is assigned a suction throttle 19.
Accordingly, a dual fuel engine 1 known from practice comprises on the one hand the fuel feeding device for feeding the liquid fuel in the liquid fuel mode of the dual fuel dual fuel engine 1, on the other hand, known from practice comprises system in order fluid into the cylinders 2 fuel mode of the engine 1 ignition fluid injection the ignition fuel engine engine 1 for to of separate introduce in the gas combustion the gaseous fuel.
the dual dual fuel
Accordingly, comprises two feeding device fluid injection ignition fluid liquid fuel mode, introducible in a dual fuel inj ection for the liquid system for is engine known from systems, namely fuel and the practice the fuel ignition the ignition fluid.
the liquid fuel of the gas fuel mode small quantity into respective cylinder via the respective ignition fluid injector of the ignition fluid injection system. In dual fuel engines known from practice, the injection nozzles of the fuel feeding device for the liquid fuel typically which in relatively via the
The the is the
20185784 prh 20 -09- 2018 mode are not suitable for feeding such small quantities of the liquid fuel in the gas fuel mode. This then requires two injection systems and brings with it a complex construction of dual fuel engines. There is a need for a new injection nozzle for a dual fuel engine and for a dual fuel engine having a simpler construction.
Starting out from this, the invention is based on the object of creating a new type of injection nozzle and a dual fuel engine having such an injection nozzle.
20185784 prh 20 -09- 2018
This object is solved through an injection nozzle according to Claim 1. By way of the injection nozzle according to the invention, liquid fuel in a liguid fuel operating mode and ignition fluid in a gas fuel operating mode is introducible into a combustion chamber of the cylinder, wherein the injection nozzle comprises an (injection) nozzle body with first injection orifices and second injection orifices as well as an (injection) nozzle needle that is displaceably guided in the (injection) nozzle body, wherein the relative position between the (injection) nozzle needle and the (injection) nozzle body determines the injection orifices via which the liguid fuel and the ignition fluid are introducible into the combustion chamber of the cylinder in the liquid fuel operating mode and in the gas fuel operating mode respectively. In the liquid fuel operating mode, such an injection nozzle can introduce the liquid fuel and in the gas fuel operating mode, the ignition fluid into the respective cylinder of the dual fuel engine with the required precision. Two injection systems are then no longer required.
According to an advantageous further development, the first injection orifices seen in the axial direction and thus in the displacement direction of the (injection) nozzle needle have a defined distance from the second injection orifices, wherein in the gas fuel operating mode the (injection) nozzle needle opens the first injection orifices and covers the second injection orifices, and wherein in the liquid fuel operating mode the (injection) nozzle needle opens the first injection orifices and the second injection orifices. In the liquid fuel operating mode, such an injection nozzle can introduce the liquid fuel and in the gas fuel operating mode the ignition fluid into the respective cylinder of the dual fuel engine with the required precision. Two injection systems are then no longer required.
Preferentially, the first injection orifices have a smaller injection orifice cross section than the second injection orifices. This is advantageous for the gas fuel operating mode in order to introduce, in the gas fuel operating mode, small quantities of the ignition fluid into the respective cylinder of the dual fuel engine with high precision.
According to a further development, the (injection) nozzle needle comprises a nozzle cone section and a nozzle slider section, wherein the nozzle cone section interacts with a first section nozzle body and the nozzle slider section with a second the first injection orifices and orifices in operation in cone section body, which the second such a manner that for an the gas fuel is lifted off opens the first inj ection comprises inj ection inj ection operating mode the the first section the nozzle slider orifices nozzle of the section and covers the second injection orifices, and that for an injection operation in the gas fuel operating mode the nozzle cone section is also lifted off the first section of
20185784 prh 20 -09- 2018 the (injection) nozzle body and the nozzle slider section opens the first injection orifices and the second injection orifices. In particular when the nozzle cone section lies against the first section of the (injection) nozzle body, the injection nozzle is inactive outside the injection operation. Such a construction of the injection nozzle is simple and allows an efficient operation of the dual fuel engine in both operating modes.
The dual fuel engine is defined in Claim 10.
Preferred further developments of the invention are obtained from the subclaims and the following description. Exemplary embodiments of the invention are
explained in more detail by way of the drawing without being restricted to this. There it shows:
Fig. 1 a block diagram of a dual fuel engine according to the prior art;
Fig. 2 an injection nozzle of a dual fuel engine according to the invention in a first state of the same;
Fig. 3 the injection nozzle of Fig. 2 in a second state of the same;
Fig. 4 the injection nozzle of Fig. 2, 3 in a third state of the same;
Fig. 5 a detail of an (injection) nozzle needle of the injection nozzle of Fig. 2 to 4; and
Fig. 6 a diagram for illustrating the functioning of the injection nozzle of Fig. 2 to 4.
20185784 prh 20 -09- 2018
The invention relates to an injection nozzle for a dual fuel engine and to a dual fuel engine. The person skilled in the art addressed here is familiar with the fundamental construction of a dual fuel engine which has already been explained in detail making reference to Fig. 1. Accordingly, in a liquid fuel mode of the dual fuel engine, a liquid, ignitable fuel, such as for example a diesel fuel, is introduced into the cylinders of the engine and combusted in the cylinders. In the gas fuel operating mode, a mixture of a gaseous fuel and air which is low-ignitable per se is introduced
20185784 prh 20 -09- 2018 into the cylinder of the dual fuel engine and ignited via an ignition fluid, wherein in particular the liquid fuel of the liquid fuel mode serves as ignition fluid in the gas fuel mode, but which liquid fuel is introduced into the combustion chamber of the cylinder in the gas fuel mode in a significantly lower quantity than in the liquid fuel mode.
In order to make this possible, dual fuel engines known from practice comprise two separate injection systems, namely a fuel injection system, via which in the liquid fuel mode the liquid fuel is introduced into the cylinders of the dual fuel engine in a relatively large quantity, and an ignition fluid injection system, via which in the gas fuel mode the ignition fluid is introduced into the cylinders in a relatively small quantity.
The invention present here relates to an injection nozzle of a cylinder of a dual fuel engine via which in the liquid fuel operating mode the liquid fuel and in the gas fuel operating mode the ignition fluid is introducible into the combustion chamber 9 of the respective cylinder 2, so that accordingly two separate injection systems are not required.
Fig. 2 to 4 show a cross section by way of an extract through such an injection nozzle 23 according to the invention, wherein the injection nozzle 23 in Fig. 2 to 4 is shown in different states in each case. Fig. 2 shows the injection nozzle 23 in a state in which via the same no fuel is introduced into the combustion chamber 9 of the respective cylinder. Fig. 3 shows the injection nozzle 23 in a state in which via the same, in particular in the gas fuel operating mode, ignition fluid is introduced into the combustion chamber 9 of the respective cylinder 2. Fig. 4 shows the injection nozzle in a state in which the same, in the liquid fuel mode, introduces the liquid fuel into the combustion chamber 9 of the respective cylinder 2.
The injection nozzle 23 according to the invention comprises an (injection) nozzle body 24, wherein the (injection) nozzle body 24 comprises multiple injection orifices on a section 24b projecting into the combustion chamber 9 of the cylinder 2, namely multiple first injection orifices 25 and multiple second injection orifices 26. In the shown, preferred exemplary embodiment, the first injection orifices 25 have a smaller injection orifice cross section than the second injection orifices 26.
The injection nozzle 23 according to the invention, comprises, furthermore, an (injection) nozzle needle 27 that is displaceably guided in the (injection) nozzle body 24. The relative position between the (injection) nozzle needle 27 and the (injection) nozzle body 24 determines the injection orifices 25, 26 via which in the liquid fuel operating mode the the gas fuel operating mode the liquid fuel and in ignition fluid is introducible into the combustion chamber 9 of the respective cylinder 2.
In the stage shown in Fig. 3, i.e.
in the state of the
20185784 prh 20 -09- 2018 liquid merely fuel mode, needle opens (inj ection) operation, so in the gas introducible the first injection orifices nozzle body during an that fuel into respective cylinder of the inj ection in the mode, relative position ignition fluid the combustion via the first
25. In the state of
Fig. 4, the chamber of Fig. 3 inj ection is then of the orifices needle 27 additionally opens also the second injection orifices 26 during an injection operation, wherein in
20185784 prh 20 -09- 2018 the liquid fuel operating mode the liquid fuel is the introducible into the combustion chamber 9 of the respective cylinder 2 both via the first injection orifices 25 and also via the second injection orifices 26.
The (injection) nozzle needle 27, seen in its axial direction, i.e. in the direction of its longitudinal centre axis 28, is displaceable relative to the (injection) nozzle body 24. Here, the (injection) nozzle needle 27 has a nozzle cone section 27a and a nozzle slider section 27b. Here, the nozzle slider section 27b is guided within the section 24b of the (injection) nozzle body 24 projecting into the combustion chamber 9, wherein this nozzle slider section 27b, dependent on the relative position of the (injection) nozzle needle 27 relative to the (injection) nozzle body 24 opens either only the first injection orifices 25 (see Fig. 2, 3) or additionally also the second injection orifices 26 (see Fig. 4) . Here, the nozzle slider section 27b has an outer contour 27 which is matched to an inner contour 30 of the section 24b of the (injection) nozzle body 24 in the region of the second injection orifices 26, so that between these surfaces 29, 30 of nozzle slider section 27b of the (injection) nozzle needle 27 and section 24b of the (injection) nozzle body 24 a sealing effect is provided.
As already explained, the (injection) nozzle needle 27, furthermore, comprises the nozzle cone section 27a, which interacts with a section 24a of the (injection) nozzle body following the section 24b of the (injection) nozzle body namely in such a manner that in particular when the nozzle cone section 27a lies again or sits on the section 24a of the (injection) nozzle body 24, the (injection) nozzle needle 27 sealingly lies against the (injection) nozzle body 24, so that no fuel or ignition fluid whatsoever can flow to the injection orifices 25, 26 so that in the state of Fig. 2 the injection nozzle 23 is then inactive and does not introduce any fuel or ignition fluid whatsoever into the combustion chamber 9 of the respective cylinder 2.
20185784 prh 20 -09- 2018
In order to introduce liquid fuel and ignition fuel respectively into the combustion chamber 9 of the respective cylinder 2 for an injection operation in the liquid fuel mode and gas fuel mode, the nozzle cone section 27a of the (injection) nozzle needle 27 is lifted off the section 24a of the (injection) nozzle body 24 (see Fig. 3 and 4), so that liquid fuel and ignition fluid can then flow via the nozzle cone section 27a of the (injection) nozzle needle 27 in the direction of the injection orifices 25, 26 namely in the state of Fig. 3 in the direction of the first injection orifices 25 and in the state of Fig. 4 both in the direction of the first injection orifices 25 and also in the direction of the second injection orifices 26, which in the state of Fig. 4 are altogether opened by the nozzle slider section 27b of the (injection) nozzle needle 27.
Accordingly, the injection nozzle 23 according to the invention comprises multiple injection orifices 25, 26, namely the first injection orifices 25 and the second injection orifices 26 which are introduced into the section 24b of the (injection) nozzle body 24. Seen in the axial direction 28 and thus in the displacement direction of the (injection) nozzle needle 27, the first injection orifices 25 and the second injection orifices 26 are spaced from one another. Preferentially, the first injection orifices 25 and the second injection orifices 26 have different injection orifice cross sections. Alternatively or additionally it is also possible that the number of the first injection orifices 24 is smaller than the number of the second injection orifices 26.
20185784 prh 20 -09- 2018
With respect to their geometry, in particular with respect to their injection orifice cross section, and/or their number, the first injection orifices 25 are designed for the gas fuel operation in order to introduce a relatively small quantity of ignition fluid into the combustion chamber 9 of the respective cylinder 2 in the gas fuel mode via the same. With respect of their geometry, in particular with respect of their injection orifice cross section, and/or their number, the second injection orifices 26 are designed to introduce the liguid fuel into the combustion chamber 9 of the respective cylinder 2 in the liquid fuel mode.
In particular when the injection nozzle 23 assumes the state of Fig. 2, i.e. when the nozzle cone section 27a of the (injection) nozzle needle 27 lies against the section 24a of the (injection) nozzle body 24, the nozzle slider section 27b opens the first injection orifices 25 but no ignition fluid or fuel can flow via the sealing seat between the nozzle cone section 27a and the section 24a of the (injection) nozzle body 24, so that, then, in the state of Fig. 2 no injection into the combustion chamber 9 of the respective cylinder 2 takes place.
In particular when the injection nozzle 23 assumes the state of Fig. 3, the nozzle cone section 27a of the (injection) nozzle needle 27 is lifted off the section 24a of the (injection) nozzle body 24, the nozzle slider section 27b of the (injection) nozzle needle 27 merely opens the first injection orifices 25 but covers the second injection orifices 26. The state of Fig. 3 serves in particular in the gas fuel mode for injecting a relatively small quantity of the ignition fluid into the combustion chamber of the respective cylinder 2. In the state of Fig. 4, the nozzle cone section 27a is again lifted off the section 24a of the (injection) nozzle body 24, the nozzle slider section 27b however opens both injection orifices, both the first injection orifices and also the second injection orifices 26 s that in the state of Fig. 4 the liquid fuel in the liquid fuel mode can be introduced into the combustion chamber 9 of the respective cylinder 2 via all injection orifices 25, 26.
From Fig. 2 to 5 it is evident that the (injection) nozzle needle 27 comprises guide passages 31 for the liquid fuel and the ignition these guide passages 31 with fluid. Radially outside, a first end individually terminate between the nozzle cone section 27a and the nozzle slider section 27b of the injection needle 27, and at a second end, these passages jointly terminate on the nozzle slider section
27b axially outside, namely in a region through which the longitudinal centre axis of these guide passages 31, liquid fuel and ignition fluid can be conducted from the relative position of the nozzle slider section 27 to the injection orifices
25, in particular when the
20185784 prh 20 -09- 2018 nozzle needle cone section 27a is lifted off (injection) nozzle body 24.
of the section 24a of the
Fig. 6 illustrates with a diagram the injection quantity M that is introducible into the combustion chamber 9 of the respective cylinder 2 during an injection operation or injection cycle with the help of the injector 23 according to the invention over the course of time. Over the time t, two different curves
20185784 prh 20 -09- 2018
32, 33 for the injection quantity M are plotted, namely with the curve 32 the injection quantity for the gas fuel mode and with the curve 33 the injection quantity for the liquid fuel mode.
The respective injection operation or injection cycle commences at the time tO, wherein before the time tO the injection nozzle 23 assumes the state of Fig. 2. Between the time tO and the time tl, the injection nozzle 23 is transferred from the state of Fig. 2 into the state of Fig. 3, wherein the injection nozzle 23 in the gas fuel mode assumes the state of Fig. 3 up to the time t2 and between the time t2 and the time t3 is transferred back into the state of Fig. 2. Accordingly, in the gas fuel mode, a relatively small quantity of ignition fluid according to the curve 32 is introduced into the combustion chamber 9 of the respective cylinder 2 via the injection nozzle 23 exclusively utilising the first injection orifices 25.
In the liquid fuel operating mode, the injection nozzle 23, starting from the state of Fig. 2, is transferred via the state of Fig. 3 into the state of Fig. 4 namely according to Fig. 6 in such a manner that the injection nozzle 23, between the times tO and tl, starting from the state of Fig. 2, is transferred into the state of Fig. 3 and maintains this state up to the time t4. Between the times t4 and t5, the injection nozzle 23 in the liquid fuel mode starting from the state of Fig. 3 is then transferred into the state of Fig. 4 so that commencing at the time t5, liquid fuel can be introduced into the combustion chamber 9 of the respective cylinder via all injection orifices 25, 26, wherein between the times t6 and t8 towards the end of the respective injection cycle of the respective injection nozzle 23 starting from the state of Fig. 4 is transferred back into the state of Fig. 2, namely between the times t6 and t7 initially starting from the state of Fig. 4 into the state of Fig. 3 and subsequently between the times t7 and t8 starting from the state of Fig. 3 into the state of Fig. 2. Accordingly, at the time t8, no liquid fuel can be introduced any longer into the combustion chamber 9 of the respective cylinder 2, since at the time t8 the nozzle cone seat 27 on the (injection) nozzle needle 27 again lies against the section 24a of the (injection) nozzle body 24.
With the injection nozzle 23 according to the invention, a relatively small quantity of ignition fluid in the gas fuel mode can be introduced into the combustion chamber 9 of the cylinder 2 of the dual fuel engine 1. In the liquid fuel mode, the liquid fuel can be introduced in a relatively large quantity into the combustion chamber 9 of the cylinder 2 likewise with a high quality. Accordingly, one and the same injection nozzle 23 can thus be utilised in the liquid fuel mode for introducing the liquid fuel and in the gas fuel mode for introducing the ignition fluid, so that separate injection systems for the liquid fuel and the ignition fluid can be omitted. Because of this, the construction of a dual fuel engine can be simplified.

Claims (11)

PatenttivaatimuksetThe claims 1. Ruiskutussuutin (23) kaksipolttoainemoottorin (1) sylinteriä (2) varten, jolloin ruiskutussuuttimen (23) kautta sylinterin paloillaan (9) on tuotavissa nestepolttoainetavassa nestemäistä polttoainetta ja kaasupolttoainekäyttö-An injector nozzle (23) for a cylinder (2) of a bi-fuel engine (1), wherein, through the injector nozzle (23), liquid fuel and gaseous fuel drive can be introduced in the liquid fuel mode through the chips (9). 5 tavassa sytytyspolttoainetta, jolloin ruiskutussuutin (23) käsittää (ruiskutus) suutinrungon (24), jossa on ensimmäiset ruiskutusaukot (25) ja toiset ruiskutusaukot (26) ja (ruiskutus)suutinneula (27), joka on ohjattu liikuteltavasti (ruiskutus) suutinrungossa (24), jolloin (ruiskutus)suutinneulan (27) ja (ruiskutus) suutinrungon (24) välinen suhteellinen asema määrittää ruiskutusaukot (25, 10 26), joiden kautta nestepolttoainetavassa nestemäinen polttoaine ja kaasupolttoainekäyttötavassa sytytyspolttoaine on tuotavissa sylinterin (2) palotilaan (9).5, ignition fuel, wherein the injection nozzle (23) comprises (injection) nozzle body (24) having first injection apertures (25) and second injection apertures (26) and (injection) Nozzle needle (27) movably guided (injection) within nozzle body (24) ), wherein the relative position between the (injection) nozzle needle (27) and the (injection) nozzle body (24) defines the injection apertures (25, 10 26) through which the liquid fuel and the gas fuel operating mode provide ignition fuel to the combustion cylinder (9). 2. Patenttivaatimuksen 1 mukainen ruiskutussuutin, tunnettu siitä, että aksiaalisessa suunnassa nähtynä ja siten (ruiskutus)suutinneulan (27) liikesuunnassa, ensimmäisillä ruiskutusaukoilla (25) on määritelty etäisyys toisistaInjection nozzle according to Claim 1, characterized in that, in the axial direction, and thus (injection) in the direction of movement of the nozzle needle (27), the first injection apertures (25) have a defined distance from each other. 15 ruiskutusaukoista (26).15 injection holes (26). 3. Patenttivaatimuksen 1 tai 2 mukainen ruiskutussuutin, tunnettu siitä, että kaasupolttoainekäyttötavassa (ruiskutus)suutinneula (27) avaa ensimmäiset ruiskutusaukot (25) ja peittää toiset ruiskutusaukot (26).Injection nozzle according to Claim 1 or 2, characterized in that, in the gas fuel mode (injection), the nozzle needle (27) opens the first injection apertures (25) and covers the second injection apertures (26). 4. Jonkin patenttivaatimuksen 1 - 3 mukainen ruiskutussuutin, t u n -An injection nozzle according to any one of claims 1 to 3, characterized in 20 nettu siitä, että nestepolttoainetavassa (ruiskutus)suutinneula (27) avaa ensimmäiset ruiskutusaukot (25) ja toiset ruiskutusaukot (26).20 in the liquid fuel mode (injection), the nozzle needle (27) opens the first injection openings (25) and the second injection openings (26). 5. Jonkin patenttivaatimuksen 1 - 4 mukainen ruiskutussuutin, tunnettu siitä, että ensimmäisillä ruiskutusaukoilla (25) on pienempi halkaisija kuin toisilla ruiskutusaukoilla (26).Injection nozzle according to one of Claims 1 to 4, characterized in that the first injection apertures (25) have a smaller diameter than the second injection apertures (26). 2525 6. Jonkin patenttivaatimuksen 1 - 5 mukainen ruiskutussuutin, tunnettu siitä, että (ruiskutus)suutinneula (27) käsittää suutinkartio-osan (27a) ja suutinliukuosan (27b), jolloin suutinkartio-osa (27a) on yhteistoiminnassa (ruiskutus) suutinrungon (24) ensimmäisen osan (24a) kanssa ja suutinliukuosa (27b) (ruiskutus)suutinrungon (24) toisen osan (24b) kanssa, joka käsittää ensimmäi30 set ruiskutusaukot (25) ja toiset ruiskutusaukot (26) sillä tavalla, että kaasupolttoainekäyttötavassa suutinkartio-osa (27a) on nostettu irti (ruiskutus) suutinrungon (24) ensimmäisestä osasta (24a) ja suutinliukuosa (27b) avaa ensimmäiset ruiskutusaukot (25) ja peittää toiset ruiskutusaukot (26) ja nestepolttoainekäyttötavassa suutinkartio-osa (27a) on nostettu irti (ruisku35 tus)suutinrungon (24) ensimmäisestä osasta (24a) ja suutinliukuosa (27b) avaa ensimmäiset ruiskutusaukot (25) ja toiset ruiskutusaukot (26).Injection nozzle according to one of claims 1 to 5, characterized in that (injection) The nozzle needle (27) comprises a nozzle cone portion (27a) and a nozzle slider portion (27b), wherein the nozzle cone portion (27a) cooperates (injection) with the nozzle body (24). a first portion (24a) and a nozzle slide portion (27b) (injection) with a second portion (24b) of the nozzle body (24) comprising first injection apertures (25) and second injection apertures (26) such that in a gas fuel mode of operation the nozzle cone portion (27a) lifted (injection) from first portion (24a) of nozzle body (24) and nozzle slider portion (27b) opens first injection apertures (25) and covers second injection apertures (26) and in fluid fuel mode, nozzle cone portion (27a) is lifted (injection 35) 24) a first portion (24a) and a nozzle slide portion (27b) opening the first injection openings (25) and the second injection openings (26). 7. Patenttivaatimuksen 6 mukainen ruiskutussuutin, tunnettu siitä, että erityisesti silloin kun suutinkartio-osa (27a) lepää (ruiskutus) suutinrungon (24) ensimmäisestä osaa (24a) vasten, ruiskutussuutin ei ole aktiivinen.Injection nozzle according to claim 6, characterized in that, in particular when the nozzle cone portion (27a) rests (injection) against the first portion (24a) of the nozzle body (24), the injection nozzle is not active. 55 8. Patenttivaatimuksen 6 tai 7 mukainen ruiskutussuutin, tunnettu siitä, että (ruiskutus)suutinneula (27) käsittää ohjausaukot (31) nestepolttoaineelle ja sytytysfluidille.Injection nozzle according to claim 6 or 7, characterized in that the (injection) nozzle needle (27) comprises guide openings (31) for liquid fuel and ignition fluid. 9. Patenttivaatimuksen 6 mukainen ruiskutussuutin, tunnettu siitä, että ohjausaukot (31) päättyvät tai alkavat ensimmäisessä päässä radiaalisestiInjection nozzle according to claim 6, characterized in that the guide openings (31) terminate or start radially at the first end 10 ulkopuolelle kulloinkin suutinkartio-osan (27a) ja suutinliukuosan (27b) välille ja päättyvät tai alkavat toisessa päässä yhdistyen aksiaalisesti suutinliukuosassa (27b).10, respectively, between the nozzle cone portion (27a) and the nozzle slide member (27b) and terminating or beginning at one end to be axially connected in the nozzle slide member (27b). 10. Kaksipolttoainemoottori, jolloin kaksipolttoainemoottorin nestepolttoainekäytössä nestepolttoainetta sen polttamiseksi on syötettävissä ainakin10. A bi-fuel engine, wherein, in the liquid fuel operation of the bi-fuel engine, at least at least 15 yhden sylinterin (2) palotilaan (9) ja jolloin kaksipolttoainemoottorin kaasupolttoainekäytössä yhtäältä kaasupolttoainetta sen polttamiseksi on syötettävissä sylinterin tai sylinterien (2) palotilaan (9) ja toisaalta sytytysfluidia on syötettävissä palotilaan sen sytyttämiseksi, tunnettu polttoaineen syöttölaitteesta, joka käsittää jokaista vastaavaa sylinteriä (2) varten jonkin patenttivaatimuksen 1 - 9 20 mukaisen ruiskutussuuttimen (23), jonka kautta nestepolttoainetavassa nestemäistä polttoainetta ja lisäksi kaasupolttoainekäyttötavassa sytytyspolttoainetta on tuotavissa vastaavan sylinterin (2) palotilaan (9).15, and wherein, in the gas fuel operation of a twin-fuel engine, gas fuel for feeding it is fed to the combustion chamber (9) of the cylinder or cylinders (2), and for injecting a nozzle (23) according to any one of claims 1 to 9, through which, in the liquid fuel mode, the liquid fuel, and further in the gas fuel mode, the ignition fuel can be introduced into the combustion space (9) of the corresponding cylinder (2).
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DE102020116707A1 (en) * 2020-06-25 2021-12-30 Man Energy Solutions Se Fuel injector of a dual-fuel internal combustion engine and dual-fuel internal combustion engine
GB2616442A (en) * 2022-03-08 2023-09-13 Delphi Tech Ip Ltd Injector Nozzle
JP2024049351A (en) 2022-09-28 2024-04-09 マン・エナジー・ソリューションズ・エスイー Injection nozzle for dual-fuel engine, dual-fuel engine, and method for operating the same

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JPH08193560A (en) * 1994-11-15 1996-07-30 Zexel Corp Variable nozzle hole type fuel injection nozzle
DE60024334T2 (en) * 1999-06-25 2006-08-10 Delphi Technologies, Inc., Troy Fuel injector
DK2386745T3 (en) 2010-05-11 2013-03-04 Waertsilae Switzerland Ltd Fuel injection device for internal combustion engines
EP2405127B1 (en) * 2010-07-07 2013-04-03 Wärtsilä Switzerland Ltd. A fuel injector for internal combustion engines
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JP2013024047A (en) * 2011-07-15 2013-02-04 Daihatsu Diesel Mfg Co Ltd Fuel injection valve
GB2530767A (en) 2014-10-01 2016-04-06 Delphi Internat Operations Luxembourg S Ã R L Fuel injector nozzle
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