WO2016102239A1 - Corps de buse et injecteur de fluide - Google Patents

Corps de buse et injecteur de fluide Download PDF

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Publication number
WO2016102239A1
WO2016102239A1 PCT/EP2015/079758 EP2015079758W WO2016102239A1 WO 2016102239 A1 WO2016102239 A1 WO 2016102239A1 EP 2015079758 W EP2015079758 W EP 2015079758W WO 2016102239 A1 WO2016102239 A1 WO 2016102239A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle body
section
opening
equivalent diameter
injection
Prior art date
Application number
PCT/EP2015/079758
Other languages
German (de)
English (en)
Inventor
Dejan Jovovic
Hong Zhang
Original Assignee
Continental Automotive Gmbh
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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2016102239A1 publication Critical patent/WO2016102239A1/fr

Links

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
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • 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
    • F02M61/1846—Dimensional characteristics of discharge orifices

Definitions

  • Nozzle Body and Fluid Injector Valve The present disclosure relates to a nozzle body for a fluid injector and a fluid injector.
  • Fluid injectors are used for the injection of force ⁇ material in internal combustion engines.
  • fuel can be injected from the nozzle body of the fluid injection valve directly into a combustion chamber of the internal combustion engine.
  • a nozzle body for a fluid injection valve is disclosed.
  • a fluid injection valve is disclosed with the nozzle body.
  • the fluid injection valve is, in particular, a fuel injection valve, preferably a gasoline or diesel injection valve.
  • the fluid injection valve is preferably designed for the injection of fuel directly into the combustion chamber of an internal combustion engine.
  • the nozzle body is hollow. In other words, it has a wall whose inner surface defines a blind hole.
  • the fluid injector has a valve body that hydraulically connects a fluid inlet region of the injector to a fluid outlet region of the injector.
  • the nozzle body is preferably arranged in the fluid outlet region. In particular, it is firmly connected to the valve body - for example, it is inserted into the valve body - or it is designed in one piece with the valve body. Preferably, it closes off the valve body on the outlet side.
  • the nozzle body has at least one injection channel penetrating the wall from the inner surface to an outer surface of the wall.
  • the outer surface of the wall is in particular that surface of the wall, which faces the combustion chamber during operation of the fluid injection valve ⁇ and in particular at least partially exposed in the combustion chamber.
  • the nozzle body has a plurality of injection channels, which are constructed in particular similar.
  • injection channels which are constructed in particular similar.
  • the following description will be made only on the basis of an injection channel where appropriate, even if the nozzle body has several injection channels.
  • the described features can be implemented on several or all of the injection channels.
  • the injection channel has a first portion and a second portion that follows the first portion downstream.
  • the second portion extends from an exit port of the injection port located in the outer surface toward a bottom surface of the second section.
  • the first portion extends from an orifice in the bottom surface of the second portion toward an inlet opening of the injection channel located in the inner surface of the wall.
  • the first portion extends from the mouth opening in the bottom surface of the second portion to the inlet opening of the injection channel in the inner surface of the wall of the nozzle body.
  • the bottom surface runs in particular annular around the mouth opening. In this way, a step is formed by means of the bottom surface in the injection channel.
  • the cross section of a ⁇ injection channel at the bottom surface formed by the transition from the first section to the second section stepwise in the downstream direction.
  • the difference between the equivalent diameter of the outlet opening and the equivalent diameter of the mouth opening is less than or equal to 40 ym, in particular both the equivalent diameter of the outlet opening and the
  • Equivalent diameter of the bottom surface are larger than the equivalent diameter of the mouth opening.
  • the difference is greater than or equal to 5 ym.
  • it has a value between 10 ym and 30 ym, with the limits included.
  • the length of the second section in an advantageous embodiment, has a value between 10 ym and 200 ym, the limits being included.
  • the equivalent diameter is understood to mean the respective diameter in the case of a circular bottom surface or a circular orifice or a circular orifice. If the shape of the mouth opening or the outlet opening deviates from a circular shape, the equivalent diameter of the diameter of the proj edictions vom Dermat.
  • the equivalent diameter of the diameter of the proj edictions simulation is the diameter of that circular area which has the same surface area as the area enclosed by the outer contour of the floor area, or like the mouth opening or the outlet opening.
  • the area of the area enclosed by the outer contour of the bottom surface is in particular the
  • the temperature at the mouth opening is particularly low, wherein the temperature can be lower, the smaller the equivalent diameter of the bottom surface and the greater the length of the second section.
  • the present nozzle body a particularly large cleaning effect in the spray hole can be achieved, for example by cavitation.
  • the cross section of the first section increases in the direction from the inlet opening to the mouth opening. For example, it increases conically, i. the first section has a frustoconical shape. In an alternative embodiment, the first portion has a cylindrical shape.
  • the first section tapers in the direction from the inlet opening to the mouth opening.
  • it tapers conically.
  • it has the shape of a truncated cone whose top surfaces are formed by the inlet opening of the injection channel and the mouth opening. In this way, a particularly low penetration depth of the fluid spray can be achieved.
  • the second portion has a cylindrical shape. Alternatively, its cross-section may increase from the bottom surface toward the exit opening.
  • the second section tapers in the direction of the outlet opening. In this way, a particularly effective interaction of the fluid with the wall surface of the second section can be achieved.
  • the nozzle body has a longitudinal axis and has a plurality of injection channels distributed around the longitudinal axis in the wall.
  • the injection channels are spaced from the longitudinal axis. They may be arranged at equal angular intervals from each other about the longitudinal axis and / or be arranged in the direction of the longitudinal axis at the same axial position. Depending on the desired shape of the discharged from the nozzle body
  • Fluid spray is also another, for example asym ⁇ metric arrangement of the injection channels conceivable.
  • the injection channels have in a development a L Lucassmit ⁇ telachse, which is inclined by about 30 ° relative to the longitudinal axis.
  • the slope has a value between 20 ° and 40 °, with the limits included.
  • the length of the injection channel has a value between 0.25 mm and 0.5 mm, z. B. of 0.36 mm.
  • the equivalent diameter of the mouth opening has a value between 0.1 mm and 0.28 mm, for example a value of 0.15 mm or 0.2 mm.
  • the borders are included.
  • the fluid injection valve has a movable closure member that cooperates with a valve seat on the inner surface of the wall of the nozzle body, so that in a closed position, in which the closing element bears against the valve seat, fluid flow through the at least one injection channel is prevented and in others Positions of the closing element is released.
  • the closing element is arranged in particular at the tip of a nozzle needle of the fluid injection valve.
  • FIG. 1 shows a longitudinal section of a fluid injection valve according to an embodiment
  • Figure 2 is a schematic longitudinal section of a section of a nozzle body of the fluid injection valve of
  • FIG. 1 A first figure.
  • FIG. 1 shows a fluid injection valve 1 according to an exemplary embodiment of the invention.
  • the fluid injection valve 1 is a fuel injection valve for the direct injection of gasoline into a combustion chamber of an internal combustion engine.
  • the fluid injection valve 1 has a valve assembly 3 and an electromagnetic actuator 5.
  • the valve assembly 3 has a multipart valve body 7 which hydraulically connects a fuel inlet of the fluid injection valve 1 to a fuel outlet of the fluid injection valve 1.
  • a nozzle body 10 is received on the outlet side in the valve body 7 and closes off the valve body 7.
  • the nozzle body 10 has a wall 20 by means of which a blind hole 30 is formed. In other words, the nozzle body is hollow and has a cavity formed by the blind hole 30 during operation of the fluid injection valve 1 fuel.
  • the wall 20 has an inner surface 210 which defines the blind hole 30 of the nozzle body 10 and a surface facing away from the blind hole 30 outer surface 220. In the present exporting ⁇ approximately example, the outer surface 220, or at least part thereof, in the operation of the fluid injection valve 1, a Interface between the fluid injection valve 1 and the combustion chamber, in which the fluid injection valve 1 injects fuel.
  • the wall 20 is penetrated by at least one injection channel 40.
  • the blind hole 30 is closed at an axial end of the nozzle body 10 through the wall 20 except for the injection channel 40 or the injection channels 40.
  • the valve assembly 3 of the fluid injection valve 1 also has a relative to the nozzle body 10 movable valve needle 9, which has a closing element 15 at its downstream end.
  • the closure member 15 cooperates with a valve seat 215 on the In ⁇ inner face 210 of the wall 20 of the nozzle body 10, together to prevent in a closing position of the closing element 15 fluid flow through the at least one injection duct 40 and to release the fluid flow in other positions.
  • FIG. 2 shows a schematic sectional view of the nozzle body 10. More precisely, it is a longitudinal section along a longitudinal axis 12 of the nozzle body 10, the part of the nozzle body 10 being in the sectional plane of FIG. 1 to the right of the longitudinal axis 12 simplifying the illustration lies, is omitted.
  • the wall 20 of the nozzle body 10 in the present case has a relative to the longitudinal axis 12 rotationssymmet ⁇ basic shape.
  • the nozzle body 10 has a plurality of injection channels 40, for example, it has six injection channels 40. The injection channels are spaced from the longitudinal axis 12 and penetrate the wall 20 from the inner surface 210 to the outer surface 220.
  • Each injection channel 40 has a central axis 45, which is inclined relative to the longitudinal axis 12, for example by an angle between 20 ° and 40 °, wherein the limits are included ⁇ .
  • the angle of inclination of the central axes 45 to the longitudinal axis 12 is about 30 °.
  • the injection channels 40 are for example arranged in the same Win ⁇ kelabrentn about the longitudinal axis 12. Other arrangements, for example an asymmetrical distribution about the longitudinal axis 12 and / or other as well as different angles of inclination are also conceivable.
  • the nozzle body 10 can also have an injection channel 40 which overlaps with the longitudinal axis 12.
  • each of the injection ports 40 is composed of a first section 410 and a second section 420.
  • the first portion 410 extends along the central axis 45 from an inlet 412 located in the inner surface 210 of the wall 20 downstream to an orifice 414 located in a bottom surface 424 of the second portion 420.
  • the inlet opening 412 delimits the injection channel 40 and the first section 410 toward the blind hole 30.
  • the second portion extends along the central axis 45 from the bottom surface 424 downstream to an exit opening 422 disposed in the outer surface 220 of the wall 20.
  • the exit port 422 defines the injection port 40 and the second portion 420 on the outer surface 220, i. on the outside of the nozzle body 10.
  • the first section 410 has a frusto-conical shape with a cross section which increases in the flow direction, that is to say the through section. knife De the inlet opening 412 is smaller than that
  • the second portion 420 has a cylindrical shape in the present embodiment, that is, the diameter of the opening.
  • the bottom surface 424 and the outlet opening 422 have the same diameter Da.
  • the diameter Da by 10 ym to 30 ym greater than the diameter Dm of the orifice 414, wherein the diameter Dm of the orifice 414, for example, is 0.2 mm.
  • the length L2 of the second section 420 - that is, the distance between the exit opening 422 and the bottom surface 424 - is between 10 ym and 200 ym, for example between 50 ym and 150 ym.
  • the total length L of the injection channel 40 - this is the sum of the length LI of the first portion 410 and the length L2 of the second portion 420 - is, for example, 0.36 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un corps de buse (10) pour un injecteur de fluide (1), ainsi qu'un injecteur de fluide (1). Selon l'invention, une surface interne (210) d'une paroi (20) du corps de buse (10) forme un trou borgne. Au moins un canal d'injection (40) traverse la paroi (20), de la surface interne (210) à une surface externe (220). La seconde section (420) du canal s'étend d'une ouverture de sortie (422) formée dans la surface externe (220) à une surface de base (424), et la première section (410) s'étend de l'ouverture de la bague (414), formée dans la surface de base (424) vers une ouverture d'entrée (412) formée dans la surface interne (210). La différence entre le diamètre équivalent (Da) de l'ouverture de sortie (422) et le diamètre équivalent (Dm) de l'ouverture de la bague (414) est plus petite ou égale à 40 µm.
PCT/EP2015/079758 2014-12-22 2015-12-15 Corps de buse et injecteur de fluide WO2016102239A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014226762.5A DE102014226762A1 (de) 2014-12-22 2014-12-22 Düsenkörper und Fluid-Einspritzventil
DE102014226762.5 2014-12-22

Publications (1)

Publication Number Publication Date
WO2016102239A1 true WO2016102239A1 (fr) 2016-06-30

Family

ID=54849943

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/079758 WO2016102239A1 (fr) 2014-12-22 2015-12-15 Corps de buse et injecteur de fluide

Country Status (2)

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DE (1) DE102014226762A1 (fr)
WO (1) WO2016102239A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3055371A1 (fr) * 2016-08-24 2018-03-02 Delphi International Operations Luxembourg S.A R.L. Corps de buse d'injecteur de carburant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB565299A (en) * 1943-10-20 1944-11-03 Wyndham Hewitt Ltd Improvements relating to the nozzles of fuel injectors for internal combustion engines
DE10118163A1 (de) * 2001-04-11 2002-10-24 Bosch Gmbh Robert Brennstoffeinspritzventil
EP2765303A1 (fr) * 2013-02-08 2014-08-13 Robert Bosch Gmbh Soupape d'injection de carburant
WO2014174906A1 (fr) * 2013-04-23 2014-10-30 日立オートモティブシステムズ株式会社 Soupape d'injection de carburant et son procédé de production

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1088666A (en) * 1964-03-09 1967-10-25 Lister & Co Ltd R A Improvements in or relating to fuel injectors for internal combustion engines
JPS58222971A (ja) * 1982-06-22 1983-12-24 Mitsubishi Heavy Ind Ltd 燃料噴射弁
DE19937961A1 (de) 1999-08-11 2001-02-15 Bosch Gmbh Robert Brennstoffeinspritzventil und Verfahren zur Herstellung von Austrittsöffnungen an Ventilen
JP2008064038A (ja) * 2006-09-07 2008-03-21 Denso Corp 燃料噴射装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB565299A (en) * 1943-10-20 1944-11-03 Wyndham Hewitt Ltd Improvements relating to the nozzles of fuel injectors for internal combustion engines
DE10118163A1 (de) * 2001-04-11 2002-10-24 Bosch Gmbh Robert Brennstoffeinspritzventil
EP2765303A1 (fr) * 2013-02-08 2014-08-13 Robert Bosch Gmbh Soupape d'injection de carburant
WO2014174906A1 (fr) * 2013-04-23 2014-10-30 日立オートモティブシステムズ株式会社 Soupape d'injection de carburant et son procédé de production

Also Published As

Publication number Publication date
DE102014226762A1 (de) 2016-06-23

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