EP2733344A1 - Nadelführungselement - Google Patents

Nadelführungselement Download PDF

Info

Publication number
EP2733344A1
EP2733344A1 EP12193208.1A EP12193208A EP2733344A1 EP 2733344 A1 EP2733344 A1 EP 2733344A1 EP 12193208 A EP12193208 A EP 12193208A EP 2733344 A1 EP2733344 A1 EP 2733344A1
Authority
EP
European Patent Office
Prior art keywords
fuel
guide member
needle guide
elongate
needle
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.)
Withdrawn
Application number
EP12193208.1A
Other languages
English (en)
French (fr)
Inventor
Andreas von der Osten-Sack
Ole Ohrt
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.)
Caterpillar Motoren GmbH and Co KG
Original Assignee
Caterpillar Motoren GmbH and Co KG
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 Caterpillar Motoren GmbH and Co KG filed Critical Caterpillar Motoren GmbH and Co KG
Priority to EP12193208.1A priority Critical patent/EP2733344A1/de
Publication of EP2733344A1 publication Critical patent/EP2733344A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • 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
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • the present disclosure generally refers to fuel injection systems of internal combustion engines, and more particularly to a needle guide member of a fuel injection system for an internal combustion engine.
  • Alternative fuels include first generation biofuels (for example palm oil, canola oil, oils based on animal fat) and second generation biofuels (for example oils made of non food corps, waste biomass)
  • first generation biofuels for example palm oil, canola oil, oils based on animal fat
  • second generation biofuels for example oils made of non food corps, waste biomass
  • second generation biofuels examples include "pyrolysis oils” obtained from the pyrolysis of, for example, wood or agricultural wastes, such as the stalks of wheat or corn, grass, wood, wood shavings, grapes, and sugar cane.
  • pyrolysis oil is predominantly produced by the "Fast Pyrolysis” technology, which comprises rapid pyrolysation of biomass in a fluidized bubbling sand bed reactor, wherein the solid heat-carrying medium is circulated and, therefore, the residence time of solids is well-controlled and high heating rates (up to 1000 °C/second) are obtained.
  • alternative fuels can differ significantly from those of commonly used fuels such as diesel fuel, light fuel oil (LFO), and heavy fuel oil (HFO), care has to be taken when alternative fuels are used as substitutes.
  • commonly used fuels such as diesel fuel, light fuel oil (LFO), and heavy fuel oil (HFO)
  • the use of alternative fuels in internal combustion engines affects in particular the supply path of the alternative fuel to a combustion chamber.
  • the supply path includes usually an injection pump systems and an injection nozzle system.
  • WO 2011/157375 discloses a two piece fuel injector formed by a needle guide member surrounded by a ceramic hood for the use with alternative fuels.
  • the present disclosure is directed, at least in part, to improving or overcoming one or more aspects of the related prior art and particularly improving an injection nozzle system.
  • a needle guide member for forming an injection nozzle system of an internal combustion engine
  • the fuel injection system may further comprise a needle and a nozzle holder
  • the needle guide member may comprise a needle guide member sealing face for providing a sealed connection to the nozzle holder, an elongate fuel redirecting groove provided within the needle guide member sealing face, and a needle guiding bore for guiding the needle between a fuel injection state and a sealed state of the fuel injection system.
  • the needle guiding bore may extend from the needle guide member sealing face into the needle guide member and may comprise a high pressure fuel chamber.
  • the needle guide member may further comprise a fuel channel fluidly interconnecting the elongate fuel redirecting groove with the high pressure fuel chamber.
  • a fuel injection system for an internal combustion engine may comprise a needle and a needle guide member as exemplarily disclosed herein, and being adapted to guide the needle within the needle guiding bore between a fuel injection state and a sealed state of the fuel injection system.
  • the fuel injection system may further comprise a nozzle holder comprising a nozzle holder sealing face for providing a sealed connection to the needle guide member, the nozzle holder comprising a nozzle holder fuel channel having a fuel outlet provided in the nozzle holder sealing face, wherein the needle guide member is mounted onto the nozzle holder, and the fuel outlet of the nozzle holder opens into the elongate fuel redirecting groove.
  • the disclosure may be based in part on the realisation that alternative fuels such as pyrolysis oil may cause an increased mechanical stress on the fuel injection system compared to commonly used fuels.
  • alternative fuels may tend to strongly cavitate within the fuel channels of the fuel injection system due to a high water content.
  • an exemplary fuel injector may combine both a cavitation reducing design of fuel channels as well as the possibility of mounting the fuel injector to a conventional nozzle holder of a fuel injection system.
  • Fig. 1 shows a non-limiting example of an internal combustion engine system with an injection nozzle system.
  • the internal combustion engine system may include, for example, an engine with a cam injection pump for a conventional pump-line-nozzle injection or an engine with a common rail injection, which may be operated more flexible, for example, to adjust an injection pressure, a rail pressure, the injection timing, the number and type of injections (for example, pre- and post-injections).
  • the internal combustion engine system includes a reservoir 1 for an alternative fuel such as pyrolysis oil and an internal combustion engine 5.
  • Internal combustion engine 5 is configured to operate, for example, with a mixture of the pyrolysis oil with additives such as mineral oil, synthetic oil, natural oil, and/or a lubricant.
  • the internal combustion engine system may optionally include one or more of reservoirs 2, 3 for the additives.
  • the internal combustion engine system may further include a homogenizer 4.
  • An inlet 4A of homogenizer 4 may be connected via corresponding lines 1A, 2A, and 3A with reservoirs 1, 2, and 3, respectively.
  • Internal combustion engine 5 includes at least one fuel injection pump 5A connected via one or more lines 4C with an outlet 4B of homogenizer 4, at least one nozzle system 5B and at least one combustion chamber 5C.
  • Nozzle system 5B is supplied with the pressurized alternative fuel by fuel injection pump 5A and is configured to spray, for example, a mixture of the pyrolysis oil, the mineral oil, the synthetic oil, the natural oil, and/or the lubricant into combustion chamber 5C.
  • a stationary or mobile power system may include for inline configurations 4, 6, 7, 8, or 9 combustion chambers with one or more associated fuel injection pumps and respective nozzle systems, while a V-configuration of an internal combustion engine may include, for example, 12 or 16 combustion chambers with one or more fuel injection pumps and respective nozzle systems.
  • internal combustion engine 5 may include features not shown, such as air systems, cooling systems, peripheries, drivetrain components, etc. Furthermore, internal combustion engine 5 may be of any size, with any number of cylinders, and in any configuration (e.g., "V,” in-line, radial, etc.). Internal combustion engine 5 may be used to power any machine or other device, including locomotive applications, on-highway trucks or vehicles, off-highway trucks or machines, earth moving equipment, generators, aerospace applications, marine applications, offshore applications, pumps, stationary equipment, or other engine powered applications.
  • Examples of internal combustion engines that are suitable for adaptation to alternative fuels include medium speed internal combustion diesel engines, like inline and V-type engines of the series M20, M25, M32, M43 manufactured by Caterpillar Motoren GmbH & Co. KG, Kiel, Germany, operated in a range of 500 to 1000 rpm.
  • FIG. 2 shows a sectional view of an exemplary embodiment of an fuel injection system 10 adapted for injecting an alternative fuel such as pyrolysis oil into a combustion chamber.
  • Fuel injection system 10 includes a needle 12, a needle guide member 14, a ceramic hood 16, and a nozzle holder 18. Needle guide member 14 and ceramic hood 16 form a two-piece injector body.
  • Needle 12 is reciprocatingly disposed within a needle guiding bore 20 extending through needle guide member 14 from a needle guide member sealing face 22 at a nozzle holder side to an injection side. Needle 12 is guided by needle guide member 14 between a fuel injection (open) state and a sealed (closed) state of fuel injection system 10. In the fuel injection state, a tip section 24 of needle 12 and a needle seat 26 of needle guiding bore 20 are spaced from each other to define a high pressure fuel path therebetween. In contrast, in the sealed state, tip section 24 engages needle seat 26. The sealed state is shown in Fig. 2 .
  • tip section 24 of needle 12 is lifted from needle seat 26 and nozzle spray holes 40 are exposed to the pressurized fuel present in high pressure fuel chamber 28 and entering blind hole section 42 through a gap between tip section 24 and needle seat 26.
  • Needle guide member 14 comprises a high pressure fuel chamber 28.
  • High pressure fuel chamber 28 is disposed in a middle section of needle guide member 14. Alternatively, high pressure fuel chamber 28 may be disposed closer to a nozzle holder side or to an injection side.
  • An elongate fuel redirecting groove 30 is provided within needle guide member sealing face 22 of needle guide member 14.
  • Elongate fuel redirecting groove 30 is formed in an elongate shape along a second axis 31. Further, elongate fuel redirecting groove 30 is defined by a ground wall 32 and a side wall 34.
  • Ground wall 32 forms a bottom of elongate fuel redirecting groove 30 and comprises a fuel inlet 37 to needle guide member fuel channel 36 in a radial inner section of elongate fuel redirecting groove 30.
  • Side wall 34 extends from needle guide member sealing face 22 into needle guide member 14 and defines a depth of elongate fuel redirecting groove 30. The depth may be within a range from 2.5 mm to 4.5 mm.
  • Ground wall 32 and side wall 34 smoothly transition into each other. Said smooth transition may have a radius within the range from 0.5 mm to 2 mm. Additionally, in the shown configuration, elongate fuel redirecting groove 30 may have a length within the range from 6 mm to 9 mm, and a width within the range from 2.5 mm to 5 mm.
  • Needle guide member fuel channel 36 extends along first longitudinal axis 35 through needle guide member 14, and fluidly interconnects elongate fuel redirecting groove 30 and high pressure fuel chamber 28. Further, needle guide member fuel channel 36 at least partly smoothly transitions into ground wall 32. In Figs. 2 and 3 , needle guide member fuel channel 36 transitions into a radial inner section of ground wall 32 of elongate fuel redirecting groove 30. Additionally, an inner channel wall of needle guide member fuel channel 36 linearly extends into a wall of high pressure fuel chamber 28.
  • Ceramic hood 16 essentially surrounds needle guide member 14 with the exception of a collar 38 of needle guide member 14 at a nozzle holder side of needle guide member 14 and an associated needle guide member sealing face 22 of needle guide member 14. At an injection side of fuel injection system 10, ceramic hood 16 provides a blind hole partly enclosing a blind hole section 42 and comprises nozzle spray holes 40 in the wall of the blind hole.
  • a nozzle holder fuel channel 46 extends along a third axis 45 through nozzle holder 18 to a fuel outlet 47 in nozzle holder sealing face 44 of nozzle holder 18.
  • Fuel outlet 47 is disposed adjacent to a radial outer section of elongate fuel redirecting groove 30. In other words, fuel outlet 47 opens into a radial outer section of elongate fuel redirecting groove 30. In this way, elongate fuel redirecting groove 30 fluidly interconnects nozzle holder fuel channel 46 of nozzle holder 18 to needle guide member fuel channel 36 of needle guide member 14.
  • elongate fuel redirecting groove 30 is arranged to bridge a distance between fuel outlet 47 and fuel inlet 37.
  • elongate fuel redirecting groove 30 may comprise a length-width ratio within the range from 1.2:1 to 2.5:1.
  • nozzle holder 18 may be a conventional nozzle holder of a conventional fuel injection system. That is, a position of nozzle holder fuel channel 46 and fuel outlet 47 may be fixed and should not be changed if it is desired the facilitate mounting of needle 12, needle guide member 14, and ceramic hood 16 to a conventional interface of fuel injection systems.
  • a mount 48 interacts with nozzle holder 18, for example, via a thread connection (not shown).
  • Mount 48 is configured to pull ceramic hood 16 towards nozzle holder 18.
  • mount 48 may be a one-sided threaded nut such as a sleeve nut.
  • mount 48 acts onto a mount contact face 50 of a collar 52 of ceramic hood 16.
  • FIG. 3 a top view on needle guide member sealing face 22 of an exemplary needle guide member 14 accommodating a needle 12 is shown.
  • cutting plane line I-I indicates the location of the section cut of sectional view of Fig. 2 .
  • Fig. 2 additionally shows ceramic hood 16, nozzle holder 18 and mount 48, which are omitted in Fig. 3 for purpose of clarity.
  • each elongate fuel redirecting groove 30 is elongated in radial direction of needle guide member 14, and is formed of a side wall 34 and ground wall 32.
  • Alternate embodiments may include different quantities of elongate fuel redirecting grooves 30 with a corresponding quantity of fuel channels 36, 46.
  • Each elongate fuel redirecting groove is elongated in radial direction of needle guide member 14.
  • elongate fuel redirecting groove 30 may be elongated in an alternate direction depending on canal courses of nozzle holder fuel channel 46 of nozzle holder 18 and needle guide member fuel channel 36 of needle guide member 14. In this way, both fuel channels 46, 36 may be fluidly connected via elongate fuel redirecting groove 30.
  • two blind holes 56 may be provided in the needle guide member sealing face 22 of needle guide member 14 to hold bolts that ensure the proper relative position between needle guide member 14 and nozzle holder 18.
  • the disclosed fuel injection systems may allow maintaining an outer shape of a conventional nozzle system.
  • the disclosed nozzle systems may thereby simplify the modification of injection systems adapted, for example, for use with alternative fuels such as pyrolysis oil.
  • the disclosed nozzle system may fulfill geometric boundary conditions of known nozzle systems, thereby simplifying a replacement of a conventional nozzle system with the herein disclosed nozzle systems.
  • the disclosed fuel injection system provides a high pressure fuel path that may reduce cavitation of strongly cavitating alternative fuels such as pyrolysis oils.
  • alternative fuels such as pyrolysis oils.
  • pyrolysis oils contain a water content of up to 20 %, which is considerably higher than the water content of conventional fuels such as diesel fuel having a water content of up to 0.2 %.
  • elongate fuel redirecting groove 30 facilitates retrofit of a conventional nozzle system with the herein disclosed nozzle system as the conventional interface, namely nozzle holder 18, is used. Moreover, elongate fuel redirecting groove 30 may participate in homogenisation of the fuel flow through fuel injection system 10 to reduce cavitation. In detail, the smooth transition between side wall 34 and ground wall 32 as well as the smooth transition between ground wall 32 and needle guide member fuel channel 36 of needle guide member 14 may help to reduce turbulences within the fuel flow if redirected.
  • first, second, and third axes 35, 31, 45 of needle guide member fuel channel 36, elongate fuel redirecting groove 30 and nozzle holder fuel channel 46, respectively, are in the same plane, which helps to reduce the degree of redirection of the fuel flow.
  • first, second, and third axes 35, 31, 45 may be not in the same plane with the other axes as the other cavitation reducing features of the present disclosure such as the smooth transitions already reduce cavitation of alternative fuels to a desired amount.
  • high pressure fuel chamber 28 may be formed in a drop-like shape, which also participates in homogenisation of the fuel flow.
  • high pressure fuel chamber 28 may be not drop-like shaped.
  • a two-piece injector formed of a needle guide member and a ceramic hood is disclosed in connection with Figs. 2 and 3
  • the disclosed needle guide member configuration allows mounting retrofitted one-piece injectors (a needle guide member without hood) to nozzle holders with preset fuel outlet positions.
  • an elongate fuel redirecting groove as disclosed herein may be arranged to bridge a distance between a fuel outlet of a nozzle holder and a fuel inlet of a needle guide member.
  • the fuel outlet may open in a radial inner section of the elongate fuel redirecting groove
  • the fuel inlet may be disposed in a radial outer section of the elongate fuel redirecting groove.
  • a nozzle holder fuel channel may open into a radial inner section of the elongate fuel redirecting groove and the needle guide member fuel channel may open into a radial outer section of the elongate fuel redirecting groove.
  • an elongate fuel redirecting groove may fluidly interconnect two fuel outlets of a nozzle holder with at least one fuel inlet disposed in the elongate fuel redirecting groove.
  • at least two elongate fuel redirecting grooves may intersect to fluidly connect at least one fuel outlet with at least one fuel inlet disposed in the fuel redirecting grooves.
  • elongate fuel redirecting groove may have any orientation and/or elongate course (such as straight, curved, zigzag) for fluidly interconnecting a fuel outlet of a nozzle holder fuel channel and a fuel inlet of a needle guide member fuel channel.
  • Those configurations may, for example, further include a drop-like shaped high pressure fuel chamber and/or the smooth transitions as disclosed herein, in particular for strongly cavitating fuels such as pyrolysis oils.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP12193208.1A 2012-11-19 2012-11-19 Nadelführungselement Withdrawn EP2733344A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12193208.1A EP2733344A1 (de) 2012-11-19 2012-11-19 Nadelführungselement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12193208.1A EP2733344A1 (de) 2012-11-19 2012-11-19 Nadelführungselement

Publications (1)

Publication Number Publication Date
EP2733344A1 true EP2733344A1 (de) 2014-05-21

Family

ID=47221184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12193208.1A Withdrawn EP2733344A1 (de) 2012-11-19 2012-11-19 Nadelführungselement

Country Status (1)

Country Link
EP (1) EP2733344A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH285899A (de) * 1950-11-13 1952-09-30 S A Durex Einspritzventil mit Kegelsitz für Brennkraftmaschinen.
US4005826A (en) * 1972-06-12 1977-02-01 National Research Development Corporation Injectors for the fuel injection systems of internal combustion engines
GB2335000A (en) * 1998-03-05 1999-09-08 Lucas Ind Plc Fuel injector having a restricted fuel flow path provided by a needle valve
WO2003029642A1 (de) * 2001-09-27 2003-04-10 Siemens Aktiengesellschaft Ventil, insbesondere kraftstoffeinspritzventil
US20080173734A1 (en) * 2004-01-27 2008-07-24 Denso Corporation Fuel injection device inhibiting abrasion
WO2011157375A1 (en) 2010-06-18 2011-12-22 Caterpillar Motoren Gmbh & Co. Kg Injection nozzle system and ceramic nozzle hood

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH285899A (de) * 1950-11-13 1952-09-30 S A Durex Einspritzventil mit Kegelsitz für Brennkraftmaschinen.
US4005826A (en) * 1972-06-12 1977-02-01 National Research Development Corporation Injectors for the fuel injection systems of internal combustion engines
GB2335000A (en) * 1998-03-05 1999-09-08 Lucas Ind Plc Fuel injector having a restricted fuel flow path provided by a needle valve
WO2003029642A1 (de) * 2001-09-27 2003-04-10 Siemens Aktiengesellschaft Ventil, insbesondere kraftstoffeinspritzventil
US20080173734A1 (en) * 2004-01-27 2008-07-24 Denso Corporation Fuel injection device inhibiting abrasion
WO2011157375A1 (en) 2010-06-18 2011-12-22 Caterpillar Motoren Gmbh & Co. Kg Injection nozzle system and ceramic nozzle hood

Similar Documents

Publication Publication Date Title
WO2009152602A8 (en) Dual fuel connector
BR0208724A (pt) Conjunto injetor de combustìvel para motor de combustão
ATE549498T1 (de) Zweikraftstoffeinspritzsystem und kraftfahrzeug mit einem solchen einspritzsystem
US20150114353A1 (en) Injection nozzle
WO2007135526A3 (en) Fuel injection nozzle
CN101994622A (zh) 减少焦化的燃料喷嘴
US9903325B2 (en) Dual fuel fuel-injector
EP2999877A1 (de) Kraftstoffeinspritzventil
EP3196457A1 (de) Kraftstoffverteiler
WO2020041111A1 (en) Liquid fuel injector having dual nozzle outlet sets, fuel system, and method
JP2007132449A (ja) 循環用コネクタ及び循環用コネクタの接続構造並びに燃料循環システム
US9546633B2 (en) Nozzle for skewed fuel injection
CN113795665A (zh) 具有用于限制喷射器串扰的固定几何形状流量调节阀的燃料系统
CA2495765A1 (en) Gas feeding system for an internal combustion engine, having an improved pressure reducing valve
US11225933B2 (en) Twin outlet check liquid fuel injector for dual fuel system
US20130087634A1 (en) Injection Nozzle System And Ceramic Nozzle Hood
CN102918255B (zh) 联接装置
EP2733344A1 (de) Nadelführungselement
KR102078882B1 (ko) 듀얼 연료 내연기관의 실린더 헤드의 분사기 구성
WO2019153495A1 (zh) V型多缸柴油机的柴油供给系统
EP4155517A3 (de) Brennkraftmaschine
EP2397683B1 (de) Einspritzdüsensystem
US9670853B2 (en) Outboard motor
WO2013182213A1 (en) Fuel guiding component
EP2397684A1 (de) Einspritzdüsensystem und Verfahren zum Betreiben des Einspritzdüsensystems

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20121119

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

R17P Request for examination filed (corrected)

Effective date: 20141120

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

17Q First examination report despatched

Effective date: 20150409

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20160205

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20160616