EP2025920B1 - Einspritzdüse für Brennstoff - Google Patents

Einspritzdüse für Brennstoff Download PDF

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Publication number
EP2025920B1
EP2025920B1 EP08159570A EP08159570A EP2025920B1 EP 2025920 B1 EP2025920 B1 EP 2025920B1 EP 08159570 A EP08159570 A EP 08159570A EP 08159570 A EP08159570 A EP 08159570A EP 2025920 B1 EP2025920 B1 EP 2025920B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
fuel
valve
injection
injection nozzle
Prior art date
Legal status (The legal status 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 status listed.)
Not-in-force
Application number
EP08159570A
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German (de)
English (en)
French (fr)
Other versions
EP2025920A1 (de
Inventor
Dr. Reiner Schulz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wartsila NSD Schweiz AG
Original Assignee
Wartsila NSD Schweiz AG
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Publication date
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Priority to EP08159570A priority Critical patent/EP2025920B1/de
Publication of EP2025920A1 publication Critical patent/EP2025920A1/de
Application granted granted Critical
Publication of EP2025920B1 publication Critical patent/EP2025920B1/de
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Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/043—Injectors with heating, cooling, or thermally-insulating means with cooling means other than air cooling
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/042—The valves being provided with fuel passages
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0047—Four-way valves or valves with more than four ways
    • 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
    • F02M2200/29—Fuel-injection apparatus having rotating means
    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0028—Valves characterised by the valve actuating means hydraulic

Definitions

  • the invention relates to an injection nozzle for injecting fuel in a diesel engine, according to the preamble of claim 1 and a diesel engine, in particular a two-stroke large diesel engine with at least one such injection nozzle.
  • injectors which include a nozzle body and a nozzle head connected thereto having a longitudinal bore and one or more nozzle orifices opening from go out of the longitudinal bore to inject fuel into a arranged in a cylinder combustion chamber of the diesel engine.
  • injectors include a valve needle disposed within the nozzle body and a valve seat which cooperates with the valve needle to control the fuel supply to the longitudinal bore and the nozzle orifices.
  • valve seat of the fuel injector is located away from the nozzle orifices because it must be sufficiently supported to accommodate the pressure loads resulting from the high injection pressures. This requires a correspondingly robust construction, which takes up relatively much space. But since typically several injectors are provided per cylinder, it would be out Space reasons, difficult to design the areas of the injectors, which are located in the immediate vicinity of the combustion chamber, according to robust. Moreover, in a two-stroke diesel engine, the cylinder head is usually so thick that these portions of the injectors would be barely cooled and thus exposed to very high temperatures during operation if the valve seats of the fuel injectors were not located as usual away from the nozzle holes. Sufficient distance between the valve seats and the corresponding orifices ensures that the valve seats do not overheat during operation and function properly under all operating conditions.
  • the volume of fuel that remains in the longitudinal bore of the nozzle head after closing the valve needle is significant.
  • the fuel remaining in the longitudinal bore heats up and may leak into the combustion chamber during the expansion phase due to the decreasing pressure. At this point in time, the temperatures in the combustion chamber may already have dropped to such an extent that they are no longer sufficient for complete combustion.
  • the volume of the remaining fuel in the longitudinal bore has a significant influence on the soot emission of the diesel engine.
  • WO 93/07386 An injection nozzle is described with a nozzle head which comprises a longitudinal bore and a nozzle opening, and with a valve which comprises a valve seat and a closing part in order to open and close the fuel supply to the nozzle head and the nozzle opening.
  • the injector after WO 93/07386 additionally comprises a closing element designed as a sleeve, which is firmly connected to the closing part of the valve in order to open and close the nozzle opening. With the additional closing element, the unwanted escape of fuel from the longitudinal bore of the nozzle head can be prevented during the expansion phase.
  • Object of the present invention is to provide an injector for injecting fuel in a diesel engine, in particular a two-stroke large diesel engine available, the closing part and closing element are easier to manufacture, and no critical coordination between the cross-sectional profile in the valve seat of the valve and requires the cross-sectional profile at the nozzle orifices.
  • a further object is to provide a diesel engine, in particular a two-stroke large diesel engine with at least one such injection nozzle available.
  • the injector according to the invention for injecting fuel into a diesel engine comprises a nozzle body and a nozzle head connected thereto, which has a longitudinal bore and one or more nozzle openings, which emanate from the longitudinal bore to fuel in a combustion chamber of the diesel engine inject.
  • the injection nozzle comprises a valve needle arranged in the interior of the nozzle body and a valve seat which cooperates with the valve needle in order to control the fuel supply to the longitudinal bore and to the nozzle openings.
  • a slide for opening and closing the nozzle openings is additionally provided in the longitudinal bore of the nozzle head, which is provided with its own actuator to operate the slide in operation offset in time from the valve needle.
  • the slide for opening and closing the nozzle openings in the longitudinal direction of the nozzle head is displaceable and / or rotatable relative thereto.
  • the slider may be formed, for example, as a sleeve or part of a sleeve or as a cylindrical part or part of a cylindrical part.
  • the actuator of the slide is designed as an electric, pneumatic or hydraulic actuator, for example as a longitudinal piston or as a hydraulic rotary valve drive.
  • the actuator of the spool may be connected to the fuel supply to the injector to control the spool with the pressure of the fuel supplied.
  • the actuator of the slide comprises a return spring, by means of which the slide or the longitudinal piston or rotary valve drive can be brought into an initial or rest position.
  • the injection nozzle comprises a circuit for cooling the nozzle body and / or nozzle head.
  • the circuit may be fueled and, if desired, connected to a reduced pressure fuel system.
  • the injection nozzle comprises a control valve, which may be arranged in an upper part or region of the injection nozzle to the actuation of the slide and / or the fuel supply to the injection nozzle and / or, if present, a circuit for cooling the nozzle body and / or nozzle head to control.
  • the invention further includes a diesel engine, in particular a two-stroke large diesel engine, with at least one injection nozzle for injecting fuel according to one or more of the embodiments and variants described above.
  • a diesel engine in particular a two-stroke large diesel engine, with at least one injection nozzle for injecting fuel according to one or more of the embodiments and variants described above.
  • Fig. 1 shows a longitudinal section through a conventional injector 10 for injecting fuel in a diesel engine, in particular in a two-stroke large diesel engine.
  • the injection nozzle 10 comprises a nozzle holder 1, a nozzle body 2 with a cylinder bore and a nozzle head 3 with a longitudinal bore 5 and nozzle openings 4 extending from the longitudinal bore to inject fuel into a combustion chamber of the diesel engine.
  • the injection nozzle 10 comprises a piston 8, which is arranged movably in the cylinder bore, a valve needle 6, which in the in Fig.
  • Fig. 2A shows a longitudinal section through an embodiment of an injection nozzle for injecting fuel in a diesel engine, in particular a two-stroke large diesel engine, according to the present invention.
  • the injection nozzle comprises a nozzle body 2 and a nozzle head 3 connected thereto, which has a longitudinal bore 5 and at least one nozzle opening 4.1, 4.2, which starts from the longitudinal bore, in order to inject fuel into a combustion chamber of the diesel engine.
  • the injection nozzle comprises a valve needle 6 arranged in the interior of the nozzle body 2 and a valve seat 7 which cooperates with the valve needle in order to control the fuel supply to the longitudinal bore 5 and to the at least one nozzle opening 4.1, 4.2.
  • a slide 14 for opening and closing the nozzle opening or openings 4.1, 4.2 is provided in the longitudinal bore 5 of the nozzle head 3 in addition, which is movable in the longitudinal direction of the nozzle head with advantage, and with its own 8.2, 9.2, 15 is provided to operate the slide 14 in operation offset in time from the valve needle 6.
  • a nozzle holder shown in Fig. 2A is omitted for clarity, and / or a piston 8.1, which is movably arranged, for example, in a cylinder bore in the nozzle body 2 and with the valve needle 6 in conjunction, occasionally operative connection, and / or comprise a return spring 9.1, the spring force on a case by case basis Piston 8.1 and / or the valve needle 6 acts to these in the injection breaks and in the To press rest against the valve seat 7 and to interrupt the fuel supply to the nozzle head 3.
  • the piston connected to the valve needle 8.1 can be acted upon by a fuel supply 12 with the fuel pressure to separate the valve needle 6 by means of the piston from the valve seat 7 and release the fuel supply to the nozzle head 3.
  • the slider 14 may, for example, as in Fig. 2A shown as a sleeve or occasionally be formed as part of a sleeve or as a cylindrical part or part of a cylindrical part, wherein in the sleeve or in the said parts case by case one or more openings are provided, the injection of fuel into the injection valve 14 or the the nozzle openings 4.1, 4.2 release.
  • the actuator of the slider 14 is designed as a hydraulic actuator, for example as a longitudinal piston 8.2, which is arranged, for example, in the valve needle 6 and / or in a connected thereto piston 8.1 movable.
  • the hydraulic actuator of the actuator is operatively connected in the embodiment with the slider 14, for example by, as in Fig. 2A shown, the movement of the longitudinal piston 8.2 is transmitted via a pin 15 on the slider.
  • the pin 15 may be movably guided, for example, in a longitudinal bore of the valve needle 6.
  • the actuator of the slide can be connected to the fuel supply 12 of the injection nozzle, for example via a compensation opening 13 in the valve needle 6 to actuate the slide 14 with the pressure of the supplied fuel.
  • the actuator of the slide 14 comprises a return spring 9.2, by means of which the slide or the longitudinal piston 8.2 can be brought into an initial or rest position to close the nozzle opening or openings 4.1, 4.2. If both the valve needle 6 and the actuator of the slider 14 are actuated with the pressure of the supplied fuel, so the spring constant and voltage of the return spring 9.1 of the valve needle 6 is suitably matched to the spring constant and voltage of the return spring 9.2 of the slider 14, and although with advantage such that the nozzle opening or openings 4.1, 4.2 are released by the slide before the valve needle 6 moves and the fuel supply to the nozzle head 3 is opened.
  • the piston connected to the valve needle 6 8.1 comprises a spiral groove 8.1 a, which connects the fuel supply 12 of the injection nozzle with a cavity formed in the nozzle body 2, which surrounds the front part of the associated with the valve needle piston 8.1 and parts of the valve needle ,
  • the piston is 8.1 centered in operation and lubricated while slowing down the pressure increase in the cavity when supplying fuel, whereby the operation of the associated with the valve needle 6 piston 8.1 can be delayed.
  • the movement of the longitudinal piston 8.2 is transmitted via the pin 15 to the slider 14, wherein the slider is moved to a position in which the opening or openings in the slide with the nozzle orifices 4.1, 4.2 in the nozzle head 3 match and these are released. If the fuel pressure in the cavity continues to increase, the piston 8.1 connected to the valve needle 6 is moved as soon as the force effect of the fuel pressure on the piston exceeds the spring force of the return spring 9.1 acting on the piston. Thus, the valve needle 6 is moved away from the valve seat 7 and the fuel supply to the nozzle head 3 and to the one or more nozzle openings 4.1, 4.2 opened. The fuel exiting through the nozzle orifice is now injected into a combustion chamber of the diesel engine.
  • the injection process is terminated by stopping the supply of fuel to the injector.
  • the fuel pressure in the cavity decreases, and the piston 8.1 connected to the valve needle 6 presses the valve needle 6 against the valve seat 7 as soon as the spring force of the return spring 9.1 acting on the piston exceeds the force effect of the fuel pressure on the piston.
  • the fuel supply to the nozzle head 3 is closed. If the fuel pressure in the cavity continues to decrease, the longitudinal piston 8.2 of the slide 14 is moved as soon as the spring force of the restoring spring 9.2 acting on the longitudinal piston exceeds the force effect of the fuel pressure on the longitudinal piston.
  • Fig. 2B shows a longitudinal section through a second embodiment of an injection nozzle for injecting fuel in a diesel engine, in particular a two-stroke large diesel engine, according to the present invention.
  • This in Fig. 2B embodiment shown differs from that in Fig. 2A shown mainly by a modified version of the fuel supply and by a further embodiment in which a drain line 16, 16 'is provided.
  • the injection nozzle comprises a nozzle body 2 and a nozzle head 3 connected thereto, which has a longitudinal bore 5 and one or more nozzle openings 4.1, 4.2 which emanate from the longitudinal bore in order to inject fuel into a combustion chamber of the diesel engine.
  • the injection nozzle comprises a valve needle 6 arranged in the interior of the nozzle body 2 and a valve seat 7 which cooperates with the valve needle in order to control the fuel supply to the longitudinal bore 5 and to the nozzle openings 4.1, 4.2.
  • a slide 14 for opening and closing the nozzle openings 4.1, 4.2 is additionally provided in the longitudinal bore 5 of the nozzle head 3, which is advantageously movable in the longitudinal direction of the nozzle head, and which is provided with its own actuator 8.2, 9.2, 15, to operate the slide 14 in operation offset in time from the valve needle 6.
  • a nozzle holder shown in Fig. 2B is omitted for clarity, and / or a piston 8.1, which is movably arranged, for example, in a cylinder bore in the nozzle body 2 and with the valve needle 6 in conjunction, occasionally operative connection, and / or comprise a return spring 9.1, the spring force on a case by case basis connected to the valve needle piston 8.1 and / or the valve needle 6 acts to press this after the injection of fuel and at rest against the valve seat 7 and to interrupt the fuel supply to the nozzle head 3.
  • the actuator of the slider 14 is designed as a hydraulic actuator, for example as a longitudinal piston 8.2, which is arranged, for example, in the valve needle 6 and / or in a connected thereto piston 8.1 movable.
  • the hydraulic actuator of the actuator is operatively connected in the embodiment with the slider 14, for example by, as in Fig. 2B shown, the movement of the longitudinal piston 8.2 is transmitted via a pin 15 on the slider.
  • the pin 15 may be movably guided, for example, in a longitudinal bore of the piston connected to the valve needle 8.1 and / or in the valve needle 6.
  • the actuator of the slide 14 comprises a return spring 9.2, by means of which the slide or the longitudinal piston 8.2 can be brought into an initial or rest position to close the nozzle opening or openings 4.1, 4.2.
  • the injection nozzle comprises a fuel feed 12, which is connected to a cavity formed in the nozzle body 2, which surrounds the front part of the piston 8.1 connected to the valve needle and parts of the valve needle.
  • the piston 8.1 can be acted upon by the fuel pressure to separate the valve needle 6 by means of the piston from the valve seat 7 and release the fuel supply to the nozzle head 3.
  • the actuator of the slide with the fuel supply 12 of the injector be connected, for example via a compensation opening 13 in the valve needle 6 to actuate the slider 14 with the pressure of the supplied fuel.
  • a leak oil line 16, 16 ' is provided for pressure relief of the guide of the pin 15. If, as in Fig. 2B shown, the pin 15 is movably guided in a longitudinal bore of the associated with the valve needle piston 8.1 and / or in the valve needle 6, a first part 16 of the drain line, for example, formed in the connected to the valve needle piston 8.1 and / or in the valve needle 6 and a second part 16 'in the nozzle body 2, wherein the two parts are connected continuously, when the valve needle 6 rests on the valve seat 7 and the fuel supply to the nozzle head 3 is closed. Thanks to the leak oil line can be prevented that fuel passes along the pin 15 in the longitudinal bore 5 of the nozzle head and the pressure of the fuel in the longitudinal bore increases before the fuel supply to the nozzle head is released by the valve needle 7.
  • Fig. 3 shows a longitudinal section through a third embodiment of an injection nozzle for injecting fuel in a diesel engine, in particular a two-stroke large diesel engine, and a control valve according to the present invention.
  • the injection nozzle comprises a nozzle body 2 and a nozzle head 3 connected thereto, which has a longitudinal bore 5 and one or more nozzle openings 4.1, 4.2 which emanate from the longitudinal bore in order to inject fuel into a combustion chamber of the diesel engine.
  • the injection nozzle comprises a valve needle 6 arranged in the interior of the nozzle body 2 and a valve seat 7 which cooperates with the valve needle in order to control the fuel supply to the longitudinal bore 5 and to the nozzle openings 4.1, 4.2.
  • a slider 14 'for opening and closing the nozzle openings 4.1, 4.2 is provided, which is rotatable with advantage with respect to the nozzle head 3, and which is provided with its own actuator 8.3, 9.3 to the slider 14' in operation offset from the valve needle 6 to actuate.
  • a nozzle holder shown in Fig. 3 is omitted for clarity, and / or a piston 8.1, which is movably arranged, for example, in a cylinder bore in the nozzle body 2 and with the valve needle 6 in conjunction, occasionally operative connection, and / or comprise a return spring, the spring force on a case by case the valve needle connected piston 8.1 and / or the valve needle 6 acts to press them in the injection breaks and in the rest state against the valve seat 7 and to interrupt the fuel supply to the nozzle head 3.
  • the piston connected to the valve needle 8.1 can be acted upon by a fuel supply 12 with the fuel pressure to separate the valve needle 6 by means of the piston from the valve seat 7 and release the fuel supply to the nozzle head 3.
  • the slider 14 ' is executed in the embodiment shown as a rotary valve, for example, as in the FIGS. 3 and 3A shown as a part which is cylindrically shaped over the greater part of the circumference, or occasionally may be formed as part of a cylindrical part or as a sleeve or part of a sleeve, wherein provided in said parts or in said sleeve case by case one or more openings are in the injection position of the slide 14 ', the fuel supply to the orifices 4.1, 4.2 release. If necessary, the slider 14 'can be rotatably guided in the nozzle head 3 and / or stored, for example in the longitudinal bore 5 of the nozzle head.
  • the actuator of the slider 14 ' is formed as a hydraulic actuator, for example, as in the Figures 3, 3B and 3C shown as a rotary drive with at least one rotatably mounted pin 8.3a and a cam formed thereon 8.3, in a cylindrical cavity or a sector of a cylindrical Cavity is rotatably guided, and which closes the cavity, so that the cam and pin perform a rotational movement when the cavity is subjected to a pressurized medium.
  • the hydraulic actuator of the actuator is in the exemplary embodiment with the slider 14 'operatively connected, for example via a slot coupling.
  • the rotary drive can be arranged, for example, between the valve seat 7 and the nozzle head 3.
  • the hydraulic actuator can also be combined with a control spool of a control valve.
  • the actuator of the slider 14 comprises a return spring 9.3, which, for example, as in Fig. 3C shown, may be formed as a spiral spring, by means of which the slide or the rotary drive can be brought into an initial or rest position to close the nozzle opening or openings 4.1, 4.2.
  • the actuator of the slide can be connected to the fuel supply 12 of the injection nozzle to actuate the slide 14 'with the pressure of the supplied fuel. If both the valve needle 6 and the actuator of the slide 14 'are actuated with the pressure of the supplied fuel, so the spring constant and - voltage of the return spring 9.1 of the valve needle 6 is suitably adjusted to the spring constant and voltage of the return spring 9.3 of the slider 14' , and with advantage such that the nozzle opening or openings 4.1, 4.2 are released by the slider before the valve needle 6 is moved and the fuel supply to the nozzle head 3 is opened.
  • the injection nozzle comprises a circuit for cooling the nozzle body 2 and / or nozzle head 3.
  • the circuit can be designed, for example, for fuel and if necessary connected to a fuel system with reduced pressure.
  • the injection nozzle comprises a control valve 20, which may be arranged in an upper part or region of the injection nozzle to the actuation of the slide 14, 14 'and / or the fuel supply to the injection nozzle and / or, if present, a circuit to control the cooling of the nozzle body 2 and / or nozzle head 3.
  • Fig. 3 is shown in the upper part of a longitudinal section through an embodiment of such a control valve.
  • the control valve 20 includes a spool 21, which is in Fig. 3 located in a position for injecting fuel, as well as an in Fig. 3 not shown auxiliary drive, such as a hydraulic cylinder, for actuating the spool.
  • the control valve may occasionally include a valve for controlling the fuel supply with a valve seat, a closing part 22 and a return spring 23 to push the closing part against the valve seat.
  • a valve for controlling the fuel supply with a valve seat, a closing part 22 and a return spring 23 to push the closing part against the valve seat.
  • the closing part 22 is pushed away by the same from the valve seat, and the supply of the fuel from the fuel supply 12 'of the control valve to the valve needle 6 of the injection nozzle via the fuel supply 12 of the injection nozzle released.
  • the control valve 20 a control function, which is designed for example as a 2/2-way or 3/2-way valve for controlling the slide 14, 14 'included, and occasionally a control line 18 through which the control valve with the Actuator of the slide is connected.
  • the corresponding supply of a pressurized medium to the control valve takes place for example via an inlet 24, which may be connected to the fuel supply or with a fuel system with reduced pressure.
  • the inlet 24 is connected to the control line 18 to actuate the slider 14, 14 'and the nozzle openings 4.1, 4.2 release.
  • a control function for controlling the circuit may be provided in the control valve 20, which comprises, for example, a 2/2-way valve.
  • the control valve is connected for this purpose via a return 17 to the cooling device of the injection nozzle.
  • a cooling device for example, as in Fig. 3 shown, the fuel supply 12, the cavity formed in the nozzle body 2, which surrounds the front part of the associated with the valve needle piston 8.1 and parts of the valve needle, and the return 17 can be used.
  • the circuit may be fueled and, if desired, connected to a reduced pressure fuel system to conserve pump power.
  • the return 17 is closed, since in the variant shown during the injection of fuel no circulation is provided in the cooling circuit.
  • Fig. 3D shows a longitudinal section through the control valve of Fig. 3 during an injection break.
  • the control valve 20 includes a spool 21, which is in Fig. 3D is in a rest position corresponding to the position during the injection pauses.
  • the control valve may occasionally include a valve for controlling the fuel supply with a valve seat, a closing part 22 and a return spring 23.
  • position of the spool 21 is the same separated from the closing part 22, so that the closing part is pressed by the return spring 23 against the valve seat and the fuel supply from the fuel supply 12 'of the control valve to the valve needle 6 of the injection nozzle is interrupted.
  • control valve 20 a control function, which is designed for example as a 2/2-way or 3/2-way valve for controlling the slide 14, 14 'included, and occasionally a control line 18 through which the control valve with the Actuator of the slide is connected.
  • control line 18 is connected to an outlet 25, which may for example be in communication with a leak oil tank to relieve the actuator of the slide and to close the nozzle opening or openings 4.1, 4.2.
  • the injection nozzle comprises a circuit for cooling the nozzle body 2 and / or nozzle head 3
  • a control function for controlling the circuit may be provided in the control valve 20, which comprises, for example, two 2/2-way valves.
  • the control valve is connected for this purpose via a return 17 to the cooling device of the injection nozzle.
  • the circuit may be designed, for example, for fuel and if necessary, connected to a fuel system with reduced pressure to save pump power.
  • the return 17 is connected to an outlet 26, which may be connected, for example, to a tank of the fuel system with reduced pressure.
  • fuel can be passed through the cooling device of the injection nozzle at reduced pressure.
  • a cooling device for example, as in Fig. 3 shown, the cavity formed in the nozzle body 2, which surrounds the front part of the associated with the valve needle piston 8.1 and parts of the valve needle, and the fuel supply 12 and the return 17 are used, which are in communication with the cavity.
  • the course of the injection process and / or the actuation of the slide 14, 14 'in the nozzle head 2 and / or a circuit for cooling the nozzle body 2 and / or nozzle head 3 can be controlled by means of the control valve 20.
  • the cooling circuit and optionally the actuator for actuating the slide from a low pressure system, such as a fuel system with reduced pressure, fed to keep the pumping losses in the cooling circuit low.
  • the spool 21 interrupts the supply to the cooling device in the injection nozzle and the return circuit 17 of the cooling circuit and / or opens the connection between the connected to a pressure system inlet 24 and the control line 18, the control valve with the actuator for the slider combines.
  • the slide in the nozzle head is brought into the injection position and the nozzle opening or openings 4.1, 4.2 are released.
  • the actual injection process is triggered by a further displacement of the spool 21, which opens a valve provided in the control valve for controlling the fuel supply, whereby the fuel passes to the valve needle 6 in the injection nozzle.
  • the piston 8.1 connected to the valve needle 6 and the valve needle are pushed away from the valve seat 7 and the fuel supply to the nozzle head 3 and to the nozzle orifices 4.1, 4.2 is opened.
  • the fuel exiting through the nozzle orifice is now injected into a combustion chamber of the diesel engine.
  • the injection process is terminated by the control spool 21 of the control valve first closing the fuel supply control valve provided therein.
  • the fuel pressure at the piston connected to the valve needle 6 drops 8.1 and the valve needle 6 is pressed by the spring force of the force acting on the piston return spring 9.1 against the valve seat 7.
  • the fuel supply to the nozzle head 3 is closed.
  • the connection between the inlet connected to a pressure system inlet 24 and the control line 18, which connects the control valve with the actuator for the slide can be interrupted.
  • the slider is moved to a position in which the nozzle opening or openings 4.1, 4.2 are closed in the nozzle head 3.
  • the supply to the cooling device in the injection nozzle and the return 17 of the cooling circuit by means of the spool can be opened to the nozzle body and / or nozzle head in the injection breaks or in the rest position to cool the injector.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Feeding And Controlling Fuel (AREA)
EP08159570A 2007-07-27 2008-07-03 Einspritzdüse für Brennstoff Not-in-force EP2025920B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08159570A EP2025920B1 (de) 2007-07-27 2008-07-03 Einspritzdüse für Brennstoff

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07113356 2007-07-27
EP08159570A EP2025920B1 (de) 2007-07-27 2008-07-03 Einspritzdüse für Brennstoff

Publications (2)

Publication Number Publication Date
EP2025920A1 EP2025920A1 (de) 2009-02-18
EP2025920B1 true EP2025920B1 (de) 2011-11-09

Family

ID=39033663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08159570A Not-in-force EP2025920B1 (de) 2007-07-27 2008-07-03 Einspritzdüse für Brennstoff

Country Status (8)

Country Link
EP (1) EP2025920B1 (ko)
JP (2) JP2009030605A (ko)
KR (1) KR20090012056A (ko)
CN (1) CN101354000B (ko)
AT (1) ATE532960T1 (ko)
BR (1) BRPI0803744A2 (ko)
DK (1) DK2025920T3 (ko)
RU (1) RU2479742C2 (ko)

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RU2445548C1 (ru) * 2011-02-10 2012-03-20 Олег Савельевич Кочетов Форсунка кочетова
FI20115418A0 (fi) * 2011-05-03 2011-05-03 Waertsilae Finland Oy Polttoaineenruiskutusyksikkö ja-järjestelmä
JP5798898B2 (ja) * 2011-11-24 2015-10-21 三菱重工業株式会社 燃料噴射装置
CN102619662B (zh) * 2012-04-18 2013-07-17 马万俊 甲醇汽车冷启动雾化喷嘴
CN103470419A (zh) * 2013-08-16 2013-12-25 浙江展途动力科技有限公司 阀芯旋转式压电直驱喷油器
CN103967674B (zh) * 2014-04-24 2016-04-06 中国北方发动机研究所(天津) 一种柴油预混合天然气喷嘴及其工作方法
DK178655B1 (en) * 2015-03-20 2016-10-17 Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland Fuel valve for injecting fuel into a combustion chamber of a large self-igniting turbocharged two-stroke internal combustion engine
DK178674B1 (en) * 2015-03-20 2016-10-24 Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland Fuel valve for injecting a low flashpoint fuel into a combustion chamber of a large self-igniting turbocharged two-stroke internal combustion engine
AT517054B1 (de) * 2015-04-14 2017-02-15 Ge Jenbacher Gmbh & Co Og Anordnung aus einem Zylinderkopf und einem Kraftstoffinjektor
DK178692B1 (en) * 2015-04-22 2016-11-21 Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland A fuel valve for a large two-stroke self-igniting internal combustion engine
DK179315B1 (en) * 2016-12-01 2018-04-30 Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland A fuel valve for injecting gaseous fuel into a combustion chamber of a large two-stroke turbocharged compression-ignition internal combustion engine and method
CN107100762B (zh) * 2017-05-17 2019-09-20 石家庄新华能源环保科技股份有限公司 一种氢气燃料发动机的氢气喷嘴
CN107795420A (zh) * 2017-11-29 2018-03-13 南昌大学 一种喷孔喷油面积可变喷油器
CN110801955A (zh) * 2018-08-05 2020-02-18 大连理工大学 一种带扭转式变截面喷孔的喷嘴
CN109973270B (zh) * 2019-05-21 2023-11-10 重油高科电控燃油喷射系统(重庆)有限公司 用于电控喷油器的控制阀偶件
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KR20240085498A (ko) 2022-12-08 2024-06-17 주식회사 티에스피 탄소중립 선박의 액화가스연료 엔진용 연료분사 패키지

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Also Published As

Publication number Publication date
ATE532960T1 (de) 2011-11-15
JP2009030605A (ja) 2009-02-12
RU2008130847A (ru) 2010-01-27
BRPI0803744A2 (pt) 2009-04-22
KR20090012056A (ko) 2009-02-02
CN101354000B (zh) 2012-04-04
JP3186787U (ja) 2013-10-24
EP2025920A1 (de) 2009-02-18
CN101354000A (zh) 2009-01-28
RU2479742C2 (ru) 2013-04-20
DK2025920T3 (da) 2012-02-27

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