EP2378109A1 - Einspritzdüse für Dieselmotoren mit großem Hubraum - Google Patents

Einspritzdüse für Dieselmotoren mit großem Hubraum Download PDF

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Publication number
EP2378109A1
EP2378109A1 EP11001060A EP11001060A EP2378109A1 EP 2378109 A1 EP2378109 A1 EP 2378109A1 EP 11001060 A EP11001060 A EP 11001060A EP 11001060 A EP11001060 A EP 11001060A EP 2378109 A1 EP2378109 A1 EP 2378109A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
shaft
cut
fuel
valve
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.)
Granted
Application number
EP11001060A
Other languages
English (en)
French (fr)
Other versions
EP2378109B1 (de
Inventor
Johannes Flarup
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.)
MAN Energy Solutions Filial af MAN Energy Solutions SE
Original Assignee
MAN Energy Solutions Filial af MAN Energy Solutions SE
MAN Diesel and Turbo Filial af MAN Diesel and Turbo SE
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 MAN Energy Solutions Filial af MAN Energy Solutions SE , MAN Diesel and Turbo Filial af MAN Diesel and Turbo SE filed Critical MAN Energy Solutions Filial af MAN Energy Solutions SE
Priority to PL11001060T priority Critical patent/PL2378109T3/pl
Publication of EP2378109A1 publication Critical patent/EP2378109A1/de
Application granted granted Critical
Publication of EP2378109B1 publication Critical patent/EP2378109B1/de
Active 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
    • 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
    • F02M61/04—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
    • F02M61/06—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 the valves being furnished at seated ends with pintle or plug shaped extensions

Definitions

  • the present disclosure relates to a fuel vale for large two-stoke diesel engines.
  • Large two-stroke diesel engines are typically used as prime movers in large ocean going ships, such as container ships or in power plants.
  • These engines are typically provided with two or 3 fuel valves arranged each the cylinder cover.
  • the fuel valve is provided with a spring biased valve needle that acts as a movable valve member.
  • a preset pressure typically 350 Bar
  • a conventional nozzle has a longitudinal axis that is roughly at an angle of 10 to 15 deg to the direction of the movement of the piston in the cylinder of the engine and the nozzle is provided with central bore and a plurality of nozzle bores that direct the fuel away from the cylinder walls and into the combustion chamber.
  • the nozzle is provided with central bore and a plurality of nozzle bores that direct the fuel away from the cylinder walls and into the combustion chamber.
  • the volume of the residual fuel e.g. in the longitudinally extending central bore inside the nozzle, the so called sac volume, may leak into the combustion chamber should be as small as possible since this fuel may enter the combustion chamber at a time where temperatures are too low for a proper combustion of the fuel. Thus this discharge may cause an increase of emissions, like increase smoke generation, higher NOx and VOC emissions and not least deteriorated fuel efficiency.
  • the nozzle of this known fuel valve is provided with bores from which the fuel spray leave the nozzle that are all at the same longitudinal position near the free tip of the nozzle.
  • the spatial distribution of the nozzle bores is obtained radially and tangentially relative to the longitudinal axis of the fuel injector. Due to space restrictions some of the nozzle bores are substantially radially directed whilst other nozzle bores are mainly tangentially directed.
  • a cut off slide/sleeve inside the central longitudinal bore with holes corresponding the nozzle bores prevent fuel from in the central bore of the nozzle from leaking out after the actual injection step has been performed.
  • a fuel valve for injecting fuel into the combustion chamber of a large twc stroke diesel engine, the fuel valve comprising a fuel valve housing, an elongated nozzle with axial bore and a closed front, a resiliently biased valve needle cooperating with a valve seat and configured to control the flow of fuel to the nozzle, a plurality of nozzle holes distributed over the nozzle with the center lines of the nozzle holes substantially coinciding with the center line of the axial bore of the nozzle, a hollow cut off shaft moving in unison with the valve needle and received axially displaceable in the central bore in the nozzle for opening and closing the nozzle holes, said cut off shaft is provided with a plurality of openings corresponding to the plurality of nozzle holes so as to connect the nozzle holes to the interior of the hollow cut-off shaft in one position of the hollow cut-off shaft and to disconnect the nozzle holes from the interior of the hollow cut-off shaft in another position of the hollow cut-off shaft and the cut-off shaft is prevented from rotating relative
  • the openings in said cut-off shaft may overlap with the nozzle holes when the valve needle is lifted from its seat.
  • the openings in said cut-off shaft do may not overlap with the nozzle holes when the valve needle is resting on its seat.
  • the hollow interior of the cut-off shaft is connected to the inlet port of the fuel valve when the valve needle is lifted from its seat.
  • valve needle and the cut-off shaft are formed as a single component.
  • the nozzle holes are distributed along the length of the nozzle without an overlap of the nozzle holes as seen in direction of the longitudinal extend of the nozzle.
  • the nozzle holes are distributed along the length of the nozzle with a substantial overlap of pairs of the nozzle holes as seen in direction of the longitudinal extend of the nozzle.
  • the fuel valve 1 illustrated in Fig. 1 has an elongated external housing 10 which at its rearmost end has a head 14 by which the fuel valve 1 in a known manner may be mounted in the cylinder cover of a large two stroke diesel engine and be connected with a fuel pump, not shown.
  • the head 14 includes a fuel oil inlet 16 which is in flow connection with a duct 17.
  • the duct extends through a non-return valve 12 to a valve needle 20 axially displaceable in a bore on the valve housing 10.
  • the valve needle 20 is biased to its seat 22 by a closing spring 18.
  • the foremost part of the valve housing 10 holds a nozzle 30 that projects through the valve housing 10 and into the combustion chamber of the engine cylinder, not shown, when the fuel valve 1 is mounted on the cylinder cover.
  • Figs. 2 to 6 show the valve needle 20 and the nozzle 30 in greater detail.
  • the closing spring 18 urges the valve needle 20 to its seat 22.
  • Fig. 2 shows the valve needle 6 resting on the valve seat 22. In this position fluid flow of fuel from the fuel oil inlet 16 to the nozzle 30 is blocked.
  • the valve needle 20 carries a foremost cut-off shaft 40 that is thinner than the rearmost section of the valve needle 20 and the cut-off shaft 40 projects into a central bore 33 in the nozzle 30.
  • the nozzle 30 is provided with a central bore 33 and with a plurality of nozzle holes 35 through which the fuel is injected into the combustion chamber. Thus, during the fuel injection a jet of fuel comes from each of the nozzle holes 35.
  • the nozzle bores 35 are distributed over the nozzle 30 so as to distribute them with a space between them along the longitudinal extent of the nozzle. Thus, even with the dimensions of the nozzle bores 35 taken into account there is no overlap of the nozzle bores 35 in the longitudinal extent. Further, the nozzle bores 35 are spread radially and radially directed in different directions so as to cover a wide sector of the combustion chamber with fuel jets coming from the nozzle bores 35.
  • the nozzle holes 35 are drilled into the nozzle.
  • the centerline 36 of each nozzle hole 35 coincides roughly with the centerline 34 of the central bore 33, i.e. the centerlines 36 of the nozzle holes 35 are not directed tangentially, instead they are all directed towards the centerline 34 of the central bore 33.
  • the centerlines 36 of the nozzle holes 35 do not have to coincide exactly with the centerline and 34 of the central bore 33, but the extent of the nozzle holes 35 should not be substantially tangential relative to the center line 34 of the central bore 33.
  • the centerline 36 of the nozzle holes 35 can be at a non-perpendicular angle with the centerline 34 of the central bore 33.
  • the cut-off shaft 40 is in an exemplary embodiment made as one piece of material with the valve needle 20.
  • the cut-off shaft 40 is hollow and the hollow interior of the cut-off shaft 40 connects to the space downstream of the valve seat 22. Thus, when the valve needle 20 is lifted from its seat the flow path 17 extends all the way from the fuel oil inlet 16 to the hollow interior of the cut-off shaft 40.
  • the foremost part of the cut-off shaft 40 is cylindrical and fits exactly into the central bore 33. This foremost part of the cut-off shaft 40 is provided with a plurality of openings 45 that correspond to the nozzle holes 35.
  • the angular position of the valve needle 20, and thereby the cut-off shaft 40 is fixed by a pin 48 that prevents the valve needle 20 from rotating relatively to the valve housing 10. This is to ensure that the openings 45 in the cut-off shaft 40 will overlap with the nozzle holes 35 when the valve needle 20 is lifted from its seat 22.
  • the valve needle 20 is lifted from its seat when the pressure of the fuel supplied to the fuel valve 1 exceeds a predetermined threshold. At this moment the fuel can flow into the hollow cut-off shaft 40 and through the openings 45 that are now overlapping with the nozzle holes 35, and through the nozzle holes 35 into the combustion chamber.
  • the reduced fuel pressure can no longer keep the valve needle 20 from its valve seat 22 and the closing needle 18 urges the valve needle 20 axially forward to its valve seat 22. Since the cut-off shaft 40 moves in unison with the valve needle 20, the cut-off shaft 40 also moves axially towards the front of the fuel valve 1. In the position where the valve needle 20 rests on its seat 22 the openings 45 in the cutoff shaft no longer overlap with the nozzle holes 35. Thus, the fuel in the nozzle (actually in the hollow cut-off shaft 40) is trapped and cannot leak into the combustion chamber.
  • the sac volume (the volume of fuel that can drip out of the nozzle after the fuel injection process has ended) is practically zero in combination with an optimal geometry for the nozzle holes 35.
  • Figs. 7 to 9 illustrate another embodiment of the invention that is essentially identical to the embodiments described above, except that the placement of the nozzle bores 35 is slightly different.
  • the nozzle bores 35 are placed in pairs of two nozzle bores 35 that are placed at substantially the same longitudinal position along the longitudinal extend of the nozzle 30. As in the embodiment described above, the nozzle bores 35 are radially distributed in the same way and for the same reasons mentioned above.
  • the advantage of the present embodiment is that it allows for the nozzle 30 to have a reduced longitudinal extent, thereby reducing the heat input during the combustion cycle.
  • One advantage of the teaching of this disclosure is that it provides for a fuel valve for a large two-stroke diesel engine that combines optimal nozzle bore configuration with a very small sac volume. It is another advantage of the present disclosure that it provides for a fuel valve that combines optimal nozzle bore configuration with a very small sac volume and a reduced nozzle length.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP11001060A 2010-04-15 2011-02-10 Einspritzdüse für Dieselmotoren mit großem Hubraum Active EP2378109B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11001060T PL2378109T3 (pl) 2010-04-15 2011-02-10 Paliwowy zawór do dużych suwowych wysokoprężnych silników

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DKPA201000309A DK201000309A (en) 2010-04-15 2010-04-15 A fuel valve for large two stroke diesel engines

Publications (2)

Publication Number Publication Date
EP2378109A1 true EP2378109A1 (de) 2011-10-19
EP2378109B1 EP2378109B1 (de) 2013-03-20

Family

ID=44269253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11001060A Active EP2378109B1 (de) 2010-04-15 2011-02-10 Einspritzdüse für Dieselmotoren mit großem Hubraum

Country Status (7)

Country Link
EP (1) EP2378109B1 (de)
JP (1) JP5269928B2 (de)
KR (1) KR101251395B1 (de)
CN (1) CN102220924B (de)
DK (2) DK201000309A (de)
PL (1) PL2378109T3 (de)
RU (1) RU2486364C2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102748179B (zh) * 2012-08-01 2016-03-09 袁辉 喷油器
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
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
CN107461287A (zh) * 2016-06-06 2017-12-12 上海汽车集团股份有限公司 喷油器及其喷油方法、电子控制单元、发动机及汽车
CN108443040A (zh) * 2018-05-25 2018-08-24 李玉龙 中重型柴油机用单体双针阀双喷嘴高压共轨喷油器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339080A (en) * 1977-11-04 1982-07-13 Robert Bosch Gmbh Fuel injection nozzle
EP0713967A1 (de) * 1994-11-25 1996-05-29 Zexel Corporation Kraftstoffeinspritzdüse mit veränderbarer Einspritzöffnung
JPH08296533A (ja) * 1995-04-26 1996-11-12 Nippon Clean Engine Lab Co Ltd 燃料噴射ノズルとその燃焼方式
EP1063416A2 (de) * 1999-06-25 2000-12-27 Delphi Technologies, Inc. Kraftstoffeinspritzventil

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR925557A (fr) * 1945-11-14 1947-09-08 Saurer Ag Adolph Buse d'injection pour moteurs à combustion interne
JPS5122925A (en) * 1974-08-19 1976-02-24 Ota Minoru Nainenkikanniokeru kairyonenryobenfunko
US4398056A (en) * 1981-07-23 1983-08-09 Exxon Research And Engineering Co. Solar cell with reflecting grating substrate
EP0106341B1 (de) * 1982-10-20 1989-01-11 Takeda Chemical Industries, Ltd. Physiologisch wirksame Verbindung P-23924, deren Herstellung und Verwendung
JPH061048B2 (ja) * 1984-03-08 1994-01-05 三菱重工業株式会社 デイ−ゼル機関の燃焼装置
JPH0417770A (ja) * 1990-05-09 1992-01-22 Hino Motors Ltd 燃料噴射装置
JPH08193560A (ja) * 1994-11-15 1996-07-30 Zexel Corp 可変噴孔型燃料噴射ノズル
DK174075B1 (da) * 1996-06-20 2002-05-21 Man B & W Diesel As Brændselsinjektor til en forbrændingsmotor
DK200201498A (da) * 2002-10-07 2004-04-08 Man B & W Diesel As En forstöver til en brændselsventil i en dieselmotor, samt en fremgangsmåde til fremstilling af en forstöver
WO2008071187A1 (en) * 2006-12-15 2008-06-19 Man Diesel A/S A fuel injector for an internal combustion engine
KR20090012056A (ko) * 2007-07-27 2009-02-02 베르트질레 슈바이츠 악티엔게젤샤프트 연료용 분사 노즐
ATE483108T1 (de) * 2007-08-31 2010-10-15 Waertsilae Nsd Schweiz Ag Einspritzdüse zum einspritzen von brennstoff

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339080A (en) * 1977-11-04 1982-07-13 Robert Bosch Gmbh Fuel injection nozzle
EP0713967A1 (de) * 1994-11-25 1996-05-29 Zexel Corporation Kraftstoffeinspritzdüse mit veränderbarer Einspritzöffnung
JPH08296533A (ja) * 1995-04-26 1996-11-12 Nippon Clean Engine Lab Co Ltd 燃料噴射ノズルとその燃焼方式
EP1063416A2 (de) * 1999-06-25 2000-12-27 Delphi Technologies, Inc. Kraftstoffeinspritzventil

Also Published As

Publication number Publication date
CN102220924B (zh) 2013-10-09
PL2378109T3 (pl) 2013-08-30
KR20110115526A (ko) 2011-10-21
KR101251395B1 (ko) 2013-04-05
DK2378109T3 (da) 2013-06-17
RU2011105685A (ru) 2012-08-20
RU2486364C2 (ru) 2013-06-27
JP5269928B2 (ja) 2013-08-21
JP2011226465A (ja) 2011-11-10
DK201000309A (en) 2011-10-16
CN102220924A (zh) 2011-10-19
EP2378109B1 (de) 2013-03-20

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