EP3159530A1 - Ensemble de buses pour une soupape d'injection d'un combustible gazeux et/ou liquide, soupape d'injection de combustible - Google Patents

Ensemble de buses pour une soupape d'injection d'un combustible gazeux et/ou liquide, soupape d'injection de combustible Download PDF

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Publication number
EP3159530A1
EP3159530A1 EP16184447.7A EP16184447A EP3159530A1 EP 3159530 A1 EP3159530 A1 EP 3159530A1 EP 16184447 A EP16184447 A EP 16184447A EP 3159530 A1 EP3159530 A1 EP 3159530A1
Authority
EP
European Patent Office
Prior art keywords
injection valve
valve member
nozzle assembly
fuel
nozzle body
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
EP16184447.7A
Other languages
German (de)
English (en)
Other versions
EP3159530B1 (fr
Inventor
Jochen Wessner
Martin Katz
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3159530A1 publication Critical patent/EP3159530A1/fr
Application granted granted Critical
Publication of EP3159530B1 publication Critical patent/EP3159530B1/fr
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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention also relates to a fuel injector for injecting a gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine having such a nozzle assembly.
  • fuel injectors are also known as dual fuel injectors or dual fuel injectors.
  • a dual fuel injector is known that is capable of selectively injecting two different fuels, such as diesel and liquefied natural gas.
  • the two-fuel injector comprises a first and a second valve needle.
  • the first valve needle on the lifting movement of the first injection holes are releasable and closable, is guided in the second valve needle liftable.
  • the second valve needle is designed for this purpose as a hollow needle.
  • About the second valve needle more spray holes are releasable or closed. All spray holes are formed in a nozzle body which surrounds the valve needles and at the same time forms a sealing seat for the two valve needles.
  • a fuel separator in the form of a sleeve is provided between the two valve needles, which is biased in the axial direction against the nozzle body. Furthermore, the injector has a hydraulic locking arrangement which is intended to counteract mixing. A minimal mixing takes place nevertheless.
  • the present invention has for its object to provide a nozzle assembly for a fuel injection valve for injecting a gaseous and / or a liquid fuel, by means of which can be represented different injection geometries in a simple manner. Furthermore, the nozzle assembly is to ensure a secure media separation.
  • the nozzle assembly is proposed with the features of claim 1. Advantageous developments of the invention can be found in the dependent claims. Further, a fuel injection valve is provided with such a nozzle assembly.
  • the nozzle assembly proposed for a fuel injection valve for injecting a gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine comprises a needle-shaped first injection valve member which is designed to release and close at least one injection hole through which the liquid fuel can be injected in an at least partially hollow needle second injection valve member is guided in a liftable manner, wherein the second injection valve member has the outer peripheral side a sealing contour which cooperates with a sealing seat which is formed in a nozzle body surrounding the second injection valve member at least partially.
  • the nozzle body has a central opening, via which the gaseous fuel can be injected in relation to the nozzle body as a function of the axial position of the second injection valve member.
  • the central opening of the nozzle body is releasable and closable via the second injection valve member.
  • the release is preferably limited to a remaining between the second injection valve member and the nozzle body free opening cross-section through which the gaseous fuel is injectable.
  • the gaseous fuel is therefore - in contrast to the liquid fuel - not introduced via at least one injection hole in the combustion chamber of the internal combustion engine. This reduces the number of spray holes, resulting in a simplification of the production result.
  • a defined injection geometry can be specified via the specific design of the opening-limiting surfaces.
  • the freedom of design is significantly greater here than in a simple spray hole.
  • Both stroke-dependent and stroke-independent injection geometries can be realized.
  • the respective injection geometry can influence the spray pattern of the gaseous fuel. For example, the penetration depth of the gaseous fuel can be varied via the spray angle. This can lead to the combustion air in the combustion chamber being better utilized.
  • the sealing contour of the second injection valve member is arranged on the outer peripheral side, the gaseous fuel is guided radially outward with respect to the second injection valve member.
  • the flow path of the liquid fuel is in contrast inside the second injection valve member. In this way, a secure media separation is effected at the same time.
  • an end portion of the second injection valve member is guided through the central opening of the nozzle body.
  • the opening is therefore bounded radially inwardly by the end portion of the second injection valve member.
  • the remaining between the injection valve member and the nozzle body free opening cross section may thus be annular, so that the gaseous fuel is injected over the entire circumference.
  • the guided through the opening end portion of the second injection valve member preferably forms a kind of cap, so that the at least partially formed as a hollow needle second injection valve member front, d. H. on the combustion chamber side, is closed.
  • the cap-like end of the second injection valve member assists effective media separation.
  • the second injection valve member has a flow-directing outer contour which extends over at least a partial circumferential area and which is arranged downstream of the sealing contour in the flow direction of the gaseous fuel. Opens the second injection valve member, the gaseous fuel via the nozzle body formed in the sealing seat of the flow-directing Outward contour of the injection valve member supplied and deflected accordingly.
  • the design of the outer contour concrete spraying angle can be specified.
  • the design of the outer contour may vary in the circumferential direction, so that the second injection valve member when opening no annular free opening cross section, but for example, only one or more sector-shaped free opening cross-sections releases. In this way, a variety of injection geometries can be realized.
  • the flow-guiding outer contour is preferably formed in a region of the end section of the second injection valve member which is guided through the central opening of the nozzle body and which lies opposite a control edge formed on the nozzle body.
  • the remaining between the second injection valve member and the nozzle body free opening cross section is therefore - depending on the stroke of the second injection valve member - variable. With increasing stroke of the second injection valve member, the free opening cross-section decreases. About the variable free opening cross-section rate shaping and a variation of the penetration depth of the gaseous fuel are particularly easy to represent.
  • the flow-guiding outer contour which extends over at least a partial circumferential area comprises at least one groove.
  • the groove serves as a gas collecting space and promotes a uniform discharge of the gaseous fuel into the combustion chamber.
  • the groove preferably has a rounded cross-section.
  • the groove may be formed as a circumferential annular groove with a constant or varying cross-section.
  • the groove is bounded in the circumferential direction by at least one flow-deflecting wall.
  • injection geometries can be realized via the at least one flow-deflecting wall, which leads to different spray angles in the circumferential direction.
  • the at least one injection hole, via which the liquid fuel can be injected is preferably formed in the second injection valve member.
  • the arrangement is preferably carried out in the region of the guided through the central opening of the nozzle body end portion of the second injection valve member, in the region of the cap-like end. Accordingly, the openings or geometries which determine the respective spray pattern of the two fuels are all formed on one component, specifically on the second injection valve member. This simplifies the necessary coordination of the openings or geometries on each other.
  • a sealing seat for the first injection valve member is formed in the second injection valve member. This is also preferably conically shaped, so that the first injection valve member automatically undergoes a centering.
  • the sealing seat formed in the nozzle body for the second injection valve member is also conically shaped. It can be achieved in this way an automatic centering of the second injection valve member with respect to the nozzle body.
  • the in the Fig. 1 illustrated nozzle assembly comprises a nozzle body 7, which surrounds a first and a second injection valve member 2, 4 at least in sections.
  • the first injection valve member 2 is designed needle-shaped and received in a liftable manner in the second injection valve member 4.
  • the second injection valve member 4 is at least partially designed as a hollow needle for receiving the first injection valve member 2.
  • the liquid fuel is passed through an annular space 15 remaining between the first and second injection valve members 2, 4.
  • the gaseous fuel is passed through an annular space 16 remaining between the second injection valve member 4 and the nozzle body 7.
  • the second injection valve member 4 has an end portion 9, which is guided through an opening 8 of the nozzle body 7.
  • the end portion 9 is designed to be largely closed. In this way a secure media separation is effected.
  • the injection hole 3 is arranged downstream of a conically shaped sealing seat 13 for the first injection valve member 2, which is formed on the inner circumference side in the second injection valve member 4, in the flow direction of the liquid fuel.
  • the gaseous fuel is introduced into the combustion chamber 1 via a free opening cross-section which, depending on the stroke of the second injection valve member 4, remains between the second injection valve member 4 and the nozzle body 7. Opens the second injection valve member 4, gaseous fuel passes through a sealing seat 6 in an outer peripheral side at the end portion 9 of the second injection valve member 4 formed groove 11, which in the present case has a rounded cross section and thus causes a deflection of the gas flow.
  • a flow-guiding outer contour 10 which merges into a cooperating with the sealing seat 6 sealing contour 5.
  • a plurality of grooves 11 are formed in the end portion 9 of the second injection valve member 4, each extending over a partial circumferential area of the end portion 9.
  • the grooves 11 are bounded in the circumferential direction by walls 12, which are also flow-guiding (see Fig. 3 ). Between the grooves 11 remaining closed sections (see Fig. 2 ) limit the gas mass flow, since the opening 8 in this area, regardless of the stroke of the second injection valve member 4, remains closed.
  • an opening 8 limiting control edge 14 is provided on the nozzle body 7 (see Fig. 1 ). This causes the remaining between the injection valve member 4 and the nozzle body 7 remaining free opening cross-section decreases with progressive stroke of the second injection valve member 4.
  • For the control edge 14 is arranged at the level of the grooves 11 formed in the second injection valve member 4.
  • FIGS. 1 to 3 show only a preferred embodiment of the invention. Modifications are possible, which relate in particular to the specific design of the end portion 8 of the second injection valve member 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP16184447.7A 2015-10-20 2016-08-17 Ensemble de buses pour une soupape d'injection d'un combustible gazeux et/ou liquide, soupape d'injection de combustible Active EP3159530B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015220416.2A DE102015220416A1 (de) 2015-10-20 2015-10-20 Düsenbaugruppe für ein Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Brennstoffs, Brennstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP3159530A1 true EP3159530A1 (fr) 2017-04-26
EP3159530B1 EP3159530B1 (fr) 2018-06-13

Family

ID=56694042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16184447.7A Active EP3159530B1 (fr) 2015-10-20 2016-08-17 Ensemble de buses pour une soupape d'injection d'un combustible gazeux et/ou liquide, soupape d'injection de combustible

Country Status (2)

Country Link
EP (1) EP3159530B1 (fr)
DE (1) DE102015220416A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60166749A (ja) * 1984-02-08 1985-08-30 Mitsubishi Heavy Ind Ltd 燃料噴射弁
US5458292A (en) * 1994-05-16 1995-10-17 General Electric Company Two-stage fuel injection nozzle
DE102012012450A1 (de) 2011-06-24 2012-12-27 Caterpillar Inc. Zweikraftstoffinjektor für ein Common-Rail-System
WO2014186892A1 (fr) * 2013-05-21 2014-11-27 Westport Power Inc. Injecteur de carburant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60166749A (ja) * 1984-02-08 1985-08-30 Mitsubishi Heavy Ind Ltd 燃料噴射弁
US5458292A (en) * 1994-05-16 1995-10-17 General Electric Company Two-stage fuel injection nozzle
DE102012012450A1 (de) 2011-06-24 2012-12-27 Caterpillar Inc. Zweikraftstoffinjektor für ein Common-Rail-System
WO2014186892A1 (fr) * 2013-05-21 2014-11-27 Westport Power Inc. Injecteur de carburant

Also Published As

Publication number Publication date
EP3159530B1 (fr) 2018-06-13
DE102015220416A1 (de) 2017-04-20

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