WO1991003640A1 - Injecteur pour moteurs diesel - Google Patents

Injecteur pour moteurs diesel Download PDF

Info

Publication number
WO1991003640A1
WO1991003640A1 PCT/DE1990/000572 DE9000572W WO9103640A1 WO 1991003640 A1 WO1991003640 A1 WO 1991003640A1 DE 9000572 W DE9000572 W DE 9000572W WO 9103640 A1 WO9103640 A1 WO 9103640A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
diesel fuel
injection
nozzle needle
tubular extension
Prior art date
Application number
PCT/DE1990/000572
Other languages
German (de)
English (en)
Inventor
Max Straubel
Karl Hofmann
Helmut Rembold
Walter Teegen
Ernst Linder
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1991003640A1 publication Critical patent/WO1991003640A1/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
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to an injection nozzle according to the preamble of the main claim.
  • Adding water to the fuel has the advantage of reducing soot and nitrogen oxide emissions.
  • the supply of water or another additional liquid in the area of the nozzle needle seat has the advantage that the quantity of additional liquid supplied can be adapted to the changing load and / or speed conditions.
  • the additional liquid is to be supplied in the area of the nozzle needle seat, this requires a relatively complicated structure of the injection nozzle and the cross section of the part of the injection nozzle protruding into the combustion chamber of the engine is enlarged, which in turn has disadvantages.
  • Such a nozzle for supplying additives to the diesel fuel in the area of the nozzle needle seat has become known, for example, from US Pat. No. 4,416,229.
  • the additive is formed from an alternative fuel
  • the injection nozzle is encased by a tubular part, through which a portion of the mixture is supplied, and the diameter of the part of the injection nozzle protruding into the fuel chamber is thereby substantially increased.
  • From DE-PS 925 139 the supply of water as an additional liquid has become known. Will be Here, if the water of the injection nozzle in the region of de 's the nozzle needle seat zuge ⁇ leads is also lost as a result of the Zu ⁇ guide bores, the diameter of the nozzle which projects into the combustion chamber part is increased and it is also the preparation of the nozzle due to the by feed holes guided by the nozzle body are made more difficult.
  • the invention essentially consists of the features of claim 1.
  • the fact that the first part of the nozzle body has the guide bore for the nozzle needle enables the nozzle needle to be guided close to the nozzle needle seat.
  • the tubular extension of this first part and the fact that the second part encloses this tubular extension while leaving a through-flow section for the additional liquid enables separate guidance of diesel fuel and additional liquid up to the area of the nozzle needle seat without drilling holes in the nozzle body .
  • the tubular extension separates the flow cross-section for the additional liquid from the flow cross-section for the diesel fuel, so that the supply of the additional liquid to the diesel fuel can take place just before the nozzle needle seat, as a result of which the metering of the additional liquid can easily be changed from injection cycle to injection cycle.
  • the setting of the nozzle is considerably simplified in this way, since there are no separate bores.
  • the first part is connected to the second part by brazing.
  • the arrangement is expediently such that the tubular extension of the outer part has at least one longitudinal channel on its outside, which is closed off by the second part and opens into an annular channel in the region of the nozzle needle seat, in the region of which the tubular extension of the first part has at least one opening, preferably a plurality of bores.
  • the separate management of additional liquid speed and diesel fuel is achieved in a simple manner and the holes in the tubular extension of the first part are easy and simple to produce.
  • these bores can be inclined obliquely to the tangential, whereby the mixing effect is promoted.
  • the tubular extension of the first part preferably has a plurality of longitudinal channels distributed over its circumference. In this way, the tubular extension of the first part is centered in the second part and since this tubular extension is now supported over its entire length on the second part, this tubular extension can be designed with a very small wall thickness, which in turn reduces the cross section of the in the combustion chamber projecting part of the injection nozzle.
  • the second part is expanded at its end facing away from the nozzle needle seat to form a hollow cylinder which partially surrounds the first part. This results in a rigid connection of the first part to the second part.
  • the soldering points connecting the first part to the second part are preferably located at the end edge of the hollow cylinder and at the end edge of the tubular extension. In this way, the flow cross-section for diesel fuel additive liquid is kept free and at the upper and lower end the tubular extension delimiting the inflow channels is connected to the second part.
  • FIG. 1 shows a longitudinal section through the nozzle along line I - I of FIG. 2.
  • Fig. 2 shows a cross section along line II - II of Fig. 1.
  • Fig. 3 shows a cross section through the nozzle and the nozzle holder. 4 shows the injection system in a partial cross section.
  • the nozzle consists of two parts 1 and 2.
  • Part 1 has the feed hole 3 for the diesel fuel and the feed hole 4 for water or, if appropriate, another additional liquid.
  • the part 2 is expanded at the upper end to a hollow cylinder 5 which partially surrounds the part 1.
  • Part 1 in the region of this hollow cylinder 5 is offset at a smaller diameter at 6, so that the cylinder forming part 1 is stepless on the outside.
  • Part 1 has a tubular extension 7, which surrounds the nozzle needle 8, leaving a through-flow section 9 for the diesel fuel supplied through the bore 3.
  • the supply hole 4 for the water opens into an annular channel 10.
  • annular channel 10 open radial channels 11, from which longitudinal channels 12 emanate, which are formed on the outer circumference of the tubular extension 7 and are closed by the inner wall 13 of part 2.
  • These longitudinal channels lead to an annular channel 14, which is also formed on the outer circumference of the tubular extension 7.
  • This ring channel 14 is connected via several bores 15 to the flow cross-section 9 for the diesel fuel formed between the nozzle needle and the tubular extension. The water is thus added just before the nozzle needle seat 16 formed in part 2.
  • the injection pressure of the diesel fuel which has an effect in space 17, " lifts the nozzle needle 8 from the seat 16, since the cross section of the shaft 18 of the nozzle needle, which in the guide bore 19 of the first Part is guided, is larger than the cross section of the nozzle needle seat 16.
  • the fuel and the water supplied via the annular space 14 are now injected into the combustion chamber of the engine.
  • tubular extension 7 is supported over its length on the inner wall 13 of the part 2, so that this tubular extension can be dimensioned relatively thin-walled.
  • connection of the part 1 with the part 2 takes place by means of an annular soldering point 21 at the upper edge of the hollow cylinder 5 and at the lower edge of the tubular attachment 7 by means of an annular soldering point 22.
  • the soldering can be carried out in a simple manner so that the annular hard solder 21 and 22 inserted and then the entire nozzle is heated, whereby the brazing takes place. The entire nozzle can then be quenched, which at the same time as the hard solder hardens has the advantage that the nozzle is also hardened.
  • FIG. 3 shows the injection nozzle 1, 2 with the nozzle holder 23 in longitudinal section.
  • the diesel fuel is supplied to the nozzle via a connection 24 and bores 25, 3.
  • the water is supplied via a connection 26 and bores 27, 4, with a check valve
  • 29 is the injection pump, from which the diesel fuel is delivered to bore 3 via a check valve 30.
  • the water is conveyed via a line 31 to the bore 4 in the first part 1 via the check valve 28.
  • the water is conveyed through a separating piston 32 which is acted upon by diesel fuel which is pressurized, for example, by the backing pump 33.
  • the water enters the working space 34 of this separating piston via a check valve 35 from one Water pump 36.
  • the water is supplied between the individual injection cycles or pressure strokes of the injection pump, however the stand pressure of the constant pressure valve, which is approximately 50 bar, must be overcome.
  • the aggressiveness of the water is greater than the aggressiveness of the fuel and at higher pressures there is a risk of cavitation. Since the supply pressure of the water is now applied by the separating piston 32, the delivery pressure of the water can be significantly lower and, for example, be 5 bar. At such low pressures, the risk of cavitation is lower. •
  • the volume of diesel fuel displaced by the additional liquid is conveyed back to the injection pump via a bypass line 37 and a check valve 38 connected into this bypass line.
  • the return can naturally also take place to the tank.

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

La présente invention se rapporte à un injecteur pour l'injection dans des moteurs diesel d'un mélange ou d'une émulsion de carburant diesel et d'eau, comportant une aiguille d'injection (8) reposant sur un siège d'aiguille (16) du corps d'injecteur (2) et s'ouvrant sous l'effet de la pression d'injection, l'addition du liquide additionnel au carburant diesel se faisant en quantités dosées dans la zone du siège de l'aiguille d'injection. Au lieu d'eau on peut aussi ajouter au carburant diesel un autre liquide additionnel. Le corps d'injecteur se compose de deux parties (1, 2) reliées entre elles, de préférence brasées dur, dont la première partie (1) présente l'orifice de guidage (19) pour l'aiguille d'injection (8) ainsi que les orifices d'arrivée (3, 4) pour le carburant diesel et le liquide additionnel, et est muni d'un embout tubulaire (7) renfermant l'aiguille d'injection (8) tout en laissant libre une section de passage (9) pour le carburant diesel, et dont la deuxième partie (2) présente le siège de l'aiguille d'injection (16) et renferme l'embout tubulaire (7) de la première partie tout en laissant libre une section de passage (12) pour le liquide additionnel, la section de passage (12) pour le liquide additionnel étant en liaison avec la section de passage (9) pour le carburant diesel dans la zone du siège de l'aiguille d'injection (16). Cette méthode permet une fabrication simple de l'injecteur.
PCT/DE1990/000572 1989-08-30 1990-07-26 Injecteur pour moteurs diesel WO1991003640A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3928611.8 1989-08-30
DE19893928611 DE3928611A1 (de) 1989-08-30 1989-08-30 Einspritzduese fuer dieselmotoren

Publications (1)

Publication Number Publication Date
WO1991003640A1 true WO1991003640A1 (fr) 1991-03-21

Family

ID=6388142

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1990/000572 WO1991003640A1 (fr) 1989-08-30 1990-07-26 Injecteur pour moteurs diesel

Country Status (2)

Country Link
DE (1) DE3928611A1 (fr)
WO (1) WO1991003640A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994007020A1 (fr) * 1992-09-12 1994-03-31 Robert Bosch Gmbh Gicleur d'alimentation en carburant avec injection d'additif pour moteurs diesel
EP0610584A1 (fr) * 1993-02-09 1994-08-17 Steyr Nutzfahrzeuge Ag Dispositif d'injection de combustible à pré-injection et injection principale de combustibles différents par un injecteur mono-aiguille
DE4407052C1 (de) * 1994-03-03 1995-03-09 Mtu Friedrichshafen Gmbh Einspritzanlage für die Einspritzung eines Kraftstoffs und einer Zusatzflüssigkeit in die Brennräume einer Brennkraftmaschine
US6149509A (en) * 1995-11-27 2000-11-21 Danville Engineering Removable nozzle for a sandblaster handpiece
US6457974B1 (en) 1999-11-18 2002-10-01 Parkell, Inc. Intraoral dental abrading instrument
US6485303B1 (en) 1999-11-18 2002-11-26 Parkell, Inc. Intraoral dental abrading instrument
US6928975B2 (en) 2000-10-24 2005-08-16 Hans Jensen Lubricators A/S Dosing system

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4445980C2 (de) * 1994-12-22 1999-12-30 Mtu Friedrichshafen Gmbh Einspritzsystem
DE19706661A1 (de) 1997-02-20 1998-08-27 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19747268A1 (de) * 1997-10-25 1999-04-29 Bosch Gmbh Robert Zweistoffdüse zur Einspritzung von Kraftstoff und einer Zusatzflüssigkeit
DE19823335C2 (de) * 1998-05-26 2001-05-31 Elsbett G Einspritzsystem für den Betrieb mit unterschiedlichen Kraftstoffen
DE19955344B4 (de) * 1999-11-17 2005-08-18 Robert Bosch Gmbh Baugruppe aus einem Kraftstoff-Einspritzventil und einem Modul zur Wasser-Einspritzung in einen Zylinder einer Verbrennungskraftmaschine
DE102012206242A1 (de) 2012-04-17 2013-10-17 Bayerische Motoren Werke Aktiengesellschaft Brennkraftmaschine
DE102015220326A1 (de) 2015-10-19 2017-04-20 Robert Bosch Gmbh Vorrichtung zur Bereitstellung von Wasser und Verfahren und Vorrichtung zur Steuerung einer elektrischen Pumpe zur Bereitstellung von Wasser für die Einspritzung in einen Brennraum eines Motors
DE102015220721B4 (de) 2015-10-23 2017-09-14 Robert Bosch Gmbh Verfahren und Vorrichtung zur Diagnose einer Wassereinspritzung in einen Brennraum eines Verbrennungsmotors
DE102016000761A1 (de) 2016-01-27 2017-07-27 Roman TANIEL Emulgiersystem und Emulgierverfahren
DE102016204632A1 (de) 2016-03-21 2017-09-21 Robert Bosch Gmbh Verfahren zum Betreiben eines Fahrzeugs mit einem Verbrennungsmotor
DE102016212903A1 (de) * 2016-07-14 2018-01-18 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betreiben eines Verbrennungsmotors
DE102016214411A1 (de) 2016-08-04 2018-02-08 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betreiben eines Verbrennungsmotors
DE102016219752A1 (de) 2016-10-11 2018-04-12 Robert Bosch Gmbh Verfahren und Vorrichtung zur Ansteuerung einer Kühlfluidpumpe
US10465632B2 (en) 2017-10-24 2019-11-05 Robert Bosch Gmbh Method and device for operating a combustion engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE568366C (de) * 1931-12-09 1933-01-18 Fried Krupp Germaniawerft Akt Brennstoffnadelventil fuer Einspritzbrennkraftmaschinen
US4699103A (en) * 1985-01-28 1987-10-13 Nippondenso Co., Ltd. Fuel injection system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE568366C (de) * 1931-12-09 1933-01-18 Fried Krupp Germaniawerft Akt Brennstoffnadelventil fuer Einspritzbrennkraftmaschinen
US4699103A (en) * 1985-01-28 1987-10-13 Nippondenso Co., Ltd. Fuel injection system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 12, No. 208, M-709; & JP,A,63 012 874, (TECH RES ASSOC HIGHLY RELIAB MARINE PROPUL PLANT), 20-01-1988. *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994007020A1 (fr) * 1992-09-12 1994-03-31 Robert Bosch Gmbh Gicleur d'alimentation en carburant avec injection d'additif pour moteurs diesel
EP0610584A1 (fr) * 1993-02-09 1994-08-17 Steyr Nutzfahrzeuge Ag Dispositif d'injection de combustible à pré-injection et injection principale de combustibles différents par un injecteur mono-aiguille
DE4407052C1 (de) * 1994-03-03 1995-03-09 Mtu Friedrichshafen Gmbh Einspritzanlage für die Einspritzung eines Kraftstoffs und einer Zusatzflüssigkeit in die Brennräume einer Brennkraftmaschine
EP0670424A1 (fr) * 1994-03-03 1995-09-06 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh Système d'injection pour injecter un combustible et un liquide additionnel dans les chambres de combustion d'un moteur à combustion interne
US6149509A (en) * 1995-11-27 2000-11-21 Danville Engineering Removable nozzle for a sandblaster handpiece
US6457974B1 (en) 1999-11-18 2002-10-01 Parkell, Inc. Intraoral dental abrading instrument
US6485303B1 (en) 1999-11-18 2002-11-26 Parkell, Inc. Intraoral dental abrading instrument
US6928975B2 (en) 2000-10-24 2005-08-16 Hans Jensen Lubricators A/S Dosing system

Also Published As

Publication number Publication date
DE3928611A1 (de) 1991-03-07

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