EP2031237B1 - Einspritzdüse zum Einspritzen von Brennstoff - Google Patents

Einspritzdüse zum Einspritzen von Brennstoff Download PDF

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Publication number
EP2031237B1
EP2031237B1 EP08160784A EP08160784A EP2031237B1 EP 2031237 B1 EP2031237 B1 EP 2031237B1 EP 08160784 A EP08160784 A EP 08160784A EP 08160784 A EP08160784 A EP 08160784A EP 2031237 B1 EP2031237 B1 EP 2031237B1
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EP
European Patent Office
Prior art keywords
fuel
passage
nozzle
compressed air
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
EP08160784A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2031237A1 (de
Inventor
Reiner Dr. 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
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 Wartsila NSD Schweiz AG filed Critical Wartsila NSD Schweiz AG
Priority to EP08160784A priority Critical patent/EP2031237B1/de
Publication of EP2031237A1 publication Critical patent/EP2031237A1/de
Application granted granted Critical
Publication of EP2031237B1 publication Critical patent/EP2031237B1/de
Not-in-force legal-status Critical Current
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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from 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
    • 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
    • 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
    • F02M61/18—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
    • 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
    • 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
    • F02M63/0049—Combined valve units, e.g. for controlling pumping chamber and injection valve
    • 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
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/0215—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits

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 one or more nozzle orifices for injecting fuel into a fuel injector To inject a cylinder arranged combustion chamber of the diesel engine.
  • injectors include an injector including a valve needle disposed within the nozzle body and a valve seat connected to the nozzle orifices via a passage formed in the nozzle body and nozzle head and cooperating with the valve needle to control the supply of fuel to the nozzle orifices ,
  • the injector further comprises a piston for actuating the valve needle, which is arranged movably in a cylinder bore, and a compression spring which acts on the piston, and which presses the valve needle connected to the piston against the valve seat, as long as the fuel pressure applied to the injection nozzle is low to prevent a drop in the injector.
  • the pressure at which opens the injection valve is set for each injector via a spring bias.
  • 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.
  • 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 orifices. 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.
  • an injection nozzle is described with a nozzle head, which comprises a passage in the form of a longitudinal bore and a nozzle opening, and with an injection valve, which includes a valve seat and a closing part 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 formed as a sleeve, which is firmly connected to the closing part of the injection valve in order to open and close the nozzle opening. With the additional Closing element can be prevented during the expansion phase of the unwanted escape of fuel from the longitudinal bore of the nozzle head.
  • 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, which is easier to manufacture, and no critical vote between the cross-sectional profile in the valve seat of the injector and the cross-sectional profile the or the nozzle openings required.
  • 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 injection nozzle according to the invention for injecting fuel into a diesel engine contains a nozzle body and a nozzle head connected thereto which has one or more nozzle openings for injecting fuel into a combustion chamber of the diesel engine.
  • the injector includes an injector including a valve needle disposed within the nozzle body and a valve seat connected to the nozzle orifices via a passage formed in the nozzle body and / or nozzle head and cooperating with the valve needle to supply the fuel to the injector To control nozzle openings.
  • the injection nozzle according to the invention additionally comprises a device for emptying the passage and a line connected to the same, which communicates with the passage in order to empty it when the injection valve is closed.
  • the device for emptying comprises a discharge line which can be coupled to the line which communicates with the passage, in order to discharge the fuel in the passage via the two lines.
  • the device for emptying comprises a control slide, which can be arranged, for example, between the two above-mentioned lines in order to discharge the fuel in the passage with the help of existing in the combustion chamber overpressure.
  • the device for emptying comprises a cylinder with a piston to receive and / or discharge the fuel from the passage.
  • the cylinder and the piston movably guided therein may each have, as required, two portions of different diameter, the cylinder on the larger diameter side being connectable to a fuel supply, and on the opposite side to the conduit communicating with the passage , Further, it is possible to provide a spring acting on the piston in order to move it to a rest position at low or absent fuel pressure.
  • the device for emptying the passage may, on a case by case basis, comprise a separator, such as a separation vessel, for separating off exhaust gases from the fuel coming from the passage.
  • a separator such as a separation vessel
  • the device for emptying is designed as a blow-out device in order to blow out the fuel in the passage through the nozzle openings.
  • the blower for example, a compressed air reservoir, which is supplied via a compressed air supply with compressed air, and / or comprise a check valve which is connected to the compressed air reservoir or the compressed air supply or can be coupled, and the compressed air supply or the compressed air reservoir or the check valve may occasionally with the with the Passage communicating line or be coupled.
  • the blower may comprise a spool valve which For example, with the compressed air supply and the compressed air reservoir is connected, and which can be actuated, for example by means of the pressure of the supplied fuel to control the compressed air supply of the compressed air reservoir.
  • the injector may additionally include, as needed, a first piston operatively connected to the valve needle and a second piston operatively connected to the first one to open and close the injector to control both pistons.
  • 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.
  • the passage can be emptied when the injection valve is closed, and the undesirable escape of fuel from the passage in injection breaks can be avoided. This also avoids the emission of soot that would otherwise result from incomplete combustion of fuel during the expansion phase.
  • the injector described above contains only parts that are either standard parts and / or can be easily manufactured.
  • Fig. 1 shows a schematic representation of an embodiment of an injection nozzle 10 for injecting fuel in a diesel engine, in particular in a two-stroke large diesel engine, according to the present invention.
  • the injection nozzle 10 includes a nozzle body 2 and a nozzle head 3 connected thereto which has one or more nozzle openings 4.1, 4.2 in order to inject fuel into a combustion chamber of the diesel engine.
  • the injection nozzle contains an injection valve which comprises a valve needle 6 arranged in the interior of the nozzle body 2 and a valve seat 7 which is connected to the nozzle openings 4.1, 4.2 via a passage 5.1, 5.2 formed in the nozzle body and nozzle head, and the valve needle 6 cooperates to control the fuel supply to the nozzle openings.
  • the injection nozzle of the embodiment additionally comprises a device 15, 16 for emptying the passage 5.1, 5.2 and connected to the same line 17, which is in communication with the passage to empty it when the injection valve is closed.
  • the device for emptying is designed as a blow-off device 15, 16 in order to blow out the fuel in the passage 5.1, 5.2 through the nozzle openings 4.1, 4.2.
  • the blower can, for example, a compressed air reservoir 15, which is supplied via a compressed air supply 14 with compressed air, and / or include a check valve 16 which is connected to the compressed air reservoir or the compressed air supply or can be coupled, and the compressed air supply 14 or the compressed air reservoir 15 or the check valve 16 may occasionally be connected or coupled to the conduit 17 communicating with the passage.
  • the compressed air supplied by the compressed air supply expediently has a pressure which is greater than the pressure present in the combustion chamber when closing the injection valve or above the maximum pressure in the combustion chamber. Typically, the pressure of the compressed air is between 100 bar and 300 bar or between 150 bar to 250 bar.
  • the compressed air reservoir is filled with compressed air before and / or during the injection process.
  • the pressure in the passage 5.1, 5.2 drops and the compressed air accumulator empties through the check valve 16, the conduit 17, the passage and the nozzle opening or openings 4.1, 4.2 in the combustion chamber, wherein the fuel trapped in the passage expelled and is atomized by means of the compressed air, advantageously immediately after closing the valve needle. 6
  • the blower may include, if necessary, a spool 20 which is connected, for example, to the compressed air supply 14 and the compressed air reservoir 15, and which may be actuated, for example, by the pressure of the supplied fuel to control the compressed air supply of the compressed air reservoir.
  • a spool 20 which is connected, for example, to the compressed air supply 14 and the compressed air reservoir 15, and which may be actuated, for example, by the pressure of the supplied fuel to control the compressed air supply of the compressed air reservoir.
  • the spool 20 is conveniently connected to a fuel supply 12 ', which is advantageously also connected to a fuel supply 12 of the injection valve.
  • the control valve 20 may occasionally include a movable slide 21 and / or a return spring 23.
  • the blow-out device and / or the control slide are arranged in or on the injection nozzle 10. With the help of the spool 20, the compressed air supply 14 can be briefly connected to the compressed air reservoir 15 at the beginning and end of the injection process to fill it with compressed air.
  • the injector can if necessary additionally a first piston 8.1, which is movably arranged, for example, in a first cylinder bore in the nozzle body 2, and which is in operative connection with the valve needle 6 or connected, and a second Pistons comprise 8.2, for example, which is movably disposed in a second cylinder bore in the nozzle body 2, and which is in operative connection with the first or is connected to control the opening and closing of the injection valve with the two pistons.
  • the diameter of the second piston is greater than the diameter of the first.
  • the first piston 8.1 can be acted upon, for example via a fuel supply 12 of the injection valve with the pressure of the supplied fuel and the second piston 8.2, for example via the compressed air supply 14 with compressed air.
  • a drain line 13 may be provided for pressure relief in the region of the first piston.
  • a compression spring may be provided which, in Fig. 1 is not shown, and can be interpreted much weaker and space-saving than in conventional injectors. The bias of the compression spring need not be adjustable, since the influence on the opening pressure of the injection valve is low.
  • the injection valve is opened as soon as the force effect of the fuel pressure on the first piston 8.1 exceeds the force effects of the compressed air on the second piston 8.2 and optionally the compression spring.
  • the fuel pressure at which the injection valve opens and which is also referred to as the opening pressure, can be controlled by means of the pressure of the compressed air.
  • all injectors of the diesel engine are supplied from the same compressed air supply, so that an individual adjustment of the opening pressure can be omitted.
  • Fig. 2 shows a schematic representation of a second embodiment of an injection nozzle 10 according to the present invention.
  • the injection nozzle 10 includes a nozzle body 2 and a nozzle head 3 connected thereto, which has one or more nozzle openings 4.1, 4.2 has to inject fuel into a combustion chamber of the diesel engine.
  • the injection nozzle contains an injection valve which comprises a valve needle 6 arranged in the interior of the nozzle body 2 and a valve seat 7 which is connected to the nozzle openings 4.1, 4.2 via a passage 5.1, 5.2 formed in the nozzle body and nozzle head, and the valve needle 6 cooperates to control the fuel supply to the nozzle openings.
  • the injection nozzle of the embodiment additionally comprises a device 18, 18a for emptying the passage 5.1, 5.2 and a line 17 connected to the same, which communicates with the passage in order to empty it when the injection valve is closed.
  • the device for emptying comprises a drain line 18 which can be coupled to the line 17 communicating with the passage 5.1, 5.2, in order to discharge the fuel in the passage via the two lines, and in particular by means of the overpressure present in the combustion chamber drain.
  • a cylinder 20, 20.1, 20.2 with a piston 21.1, 21.2 include to receive the fuel from the passage and / or discharge.
  • the cylinder and the piston guided in the same can have two sections 20.1, 20.2 or 21.1, 21.2 with different diameters, the cylinder on the side with the larger diameter being able to be connected to a fuel supply 12 'and on the opposite side with the conduit 17 communicating with the passage to aspirate and / or receive the fuel trapped in the passage.
  • the fuel supply 12 ' may be connected to a fuel supply 12 of the injection valve, if necessary.
  • the piston moves 21.1, 21.2 with increasing fuel pressure, but still closed valve needle, down, thereby optionally fuel from the cylinder is pressed into the passage.
  • the valve needle When the valve needle is open, the piston remains due to the different diameter in the upper and lower portion and due to the pressure drop in the valve seat 7 in the lower position.
  • a connection to the drain line 18 can be provided via a throttle 18a in order to vent the connecting line 17.
  • the piston 21.2 for example, as in Fig. 2 shown, with a passage 22 may be provided, and the cylinder 20.2 with an outlet opening, which opens into the inside in the lower position of the piston in the passage 20, and which is connected to the outside with the throttle 18a.
  • the piston 21.1, 21.2 is displaced into the upper position by the spring 23 and the increasing pressure in the combustion chamber, whereby fuel is sucked and / or pressed from the passage into the cylinder.
  • the piston remains until the next increase in fuel pressure, that is, until the next injection event in the upper position.
  • a further outlet opening may be provided on the cylinder, which is connected to the discharge line 18 to discharge sucked or received fuel from the cylinder.
  • Fig. 3 shows a schematic representation of a third embodiment of an injection nozzle 10 according to the present invention.
  • the injection nozzle 10 includes a nozzle body 2 and a nozzle head 3 connected thereto which has one or more nozzle openings 4.1, 4.2 in order to inject fuel into a combustion chamber of the diesel engine.
  • the injection nozzle contains an injection valve which comprises a valve needle 6 arranged in the interior of the nozzle body 2 and a valve seat 7 which is connected to the nozzle openings 4.1, 4.2 via a passage 5.1, 5.2 formed in the nozzle body and nozzle head, and the valve needle 6 cooperates to control the fuel supply to the nozzle openings.
  • the injection nozzle of the embodiment additionally comprises a device 18, 18a, 19, 19a, 20 for emptying the passage 5.1, 5.2 and connected to the same line 17 which communicates with the passage in order to empty it when the injection valve is closed.
  • the device for emptying comprises a drain line 18 which can be coupled to the line 17 communicating with the passage 5.1, 5.2, in order to discharge the fuel in the passage via the two lines, and in particular by means of the overpressure present in the combustion chamber drain.
  • the device for emptying comprises a control slide 20, which can be actuated, for example, by means of an electromagnet, and which can be arranged, for example, between the line 17 communicating with the passage 5.1, 5.2 and the drain line 18 to the fuel in the passage with the help of existing in the combustion chamber overpressure.
  • the spool 20 may, if necessary, include a movable slide 21 and / or a return spring.
  • the control valve 20 may be arranged in or on the injection nozzle 10.
  • the injector can if necessary additionally a first piston 8.1, which is movably arranged, for example, in a first cylinder bore in the nozzle body 2, and which is in operative connection with the valve needle 6 or connected, and a second Pistons comprise 8.2, for example, which is movably disposed in a second cylinder bore in the nozzle body 2, and which is in operative connection with the first or is connected to control the opening and closing of the injection valve with the two pistons.
  • the diameter of the second piston is greater than the diameter of the first.
  • the first piston 8.1 for example, via a fuel supply 12 of the injection valve with the pressure of the supplied Fuel can be acted upon, and the second piston 8.2 may be connected, for example via a throttle 12a with a fuel supply 12 'of the injection nozzle.
  • the fuel supply 12 of the injection valve is connected to the fuel supply 12 'of the injection nozzle.
  • the fuel pressure acting on the second piston is controlled by, for example, venting fuel supplied to the second piston via the spool 20 into a drain line 13. The flow can be limited by the throttle 12a.
  • a pressure relief line can be provided for pressure relief in the region of the first piston 8.1, which is connected to the drain line 13.
  • a compression spring may be provided which, in Fig. 3 is not shown, and can be interpreted much weaker and space-saving than conventional injectors.
  • the bias of the compression spring need not be adjustable, since the influence on the opening pressure of the injection valve is low.
  • the closing force of the valve needle 6 can be generated for example by the fuel pressure and possibly by the bias of the compression spring.
  • the injection valve is opened as soon as the spool 20 reduces the fuel pressure acting on the second piston 8.2 and the force effect of the fuel pressure on the first piston 8.1 exceeds the force effects of the reduced fuel pressure on the second piston and optionally the compression spring.
  • the pressure reduction acting on the second piston 8.2 is released and the injection valve is closed.
  • the device for emptying the passage can, in all embodiments and variants with a discharge line, comprise a separating device, such as a separation tank 18a, for separating off exhaust gases from the fuel from the passage and recovering them as needed.
  • the separation device can be arranged, for example, in front of the discharge line 18 or inserted into this.
  • the separating device as in Fig. 3 shown connected to an exhaust pipe 19 to discharge the separated exhaust gases.
  • a throttle 19a may be provided in the exhaust pipe or a regulator to adjust the pressure in the separator.
  • the passage can be emptied with the injector closed and dripping of the fuel can be avoided. As a result, the soot emission of the diesel engine can be reduced.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
EP08160784A 2007-08-31 2008-07-21 Einspritzdüse zum Einspritzen von Brennstoff Not-in-force EP2031237B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08160784A EP2031237B1 (de) 2007-08-31 2008-07-21 Einspritzdüse zum Einspritzen von Brennstoff

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07115450 2007-08-31
EP08160784A EP2031237B1 (de) 2007-08-31 2008-07-21 Einspritzdüse zum Einspritzen von Brennstoff

Publications (2)

Publication Number Publication Date
EP2031237A1 EP2031237A1 (de) 2009-03-04
EP2031237B1 true EP2031237B1 (de) 2010-09-29

Family

ID=39092796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08160784A Not-in-force EP2031237B1 (de) 2007-08-31 2008-07-21 Einspritzdüse zum Einspritzen von Brennstoff

Country Status (9)

Country Link
EP (1) EP2031237B1 (ko)
JP (1) JP2009057977A (ko)
KR (1) KR20090023103A (ko)
CN (1) CN101377181A (ko)
AT (1) ATE483108T1 (ko)
BR (1) BRPI0803370A2 (ko)
DE (1) DE502008001427D1 (ko)
DK (1) DK2031237T3 (ko)
RU (1) RU2008135270A (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013002758B4 (de) * 2013-02-19 2020-03-19 Woodward L'orange Gmbh Spülverfahren zur Durchführung mit einem Kraftstoffinjektor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090012056A (ko) * 2007-07-27 2009-02-02 베르트질레 슈바이츠 악티엔게젤샤프트 연료용 분사 노즐
DK201000309A (en) * 2010-04-15 2011-10-16 Man Diesel & Turbo Filial Tyskland A fuel valve for large two stroke diesel engines
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ATE483108T1 (de) 2010-10-15
JP2009057977A (ja) 2009-03-19
DE502008001427D1 (de) 2010-11-11
BRPI0803370A2 (pt) 2009-05-05
EP2031237A1 (de) 2009-03-04
DK2031237T3 (da) 2011-01-10
CN101377181A (zh) 2009-03-04
KR20090023103A (ko) 2009-03-04

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