WO2019030049A1 - Injecteur pour carburants gazeux - Google Patents

Injecteur pour carburants gazeux Download PDF

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Publication number
WO2019030049A1
WO2019030049A1 PCT/EP2018/070710 EP2018070710W WO2019030049A1 WO 2019030049 A1 WO2019030049 A1 WO 2019030049A1 EP 2018070710 W EP2018070710 W EP 2018070710W WO 2019030049 A1 WO2019030049 A1 WO 2019030049A1
Authority
WO
WIPO (PCT)
Prior art keywords
injector according
gas jet
gaseous fuel
injector
injection
Prior art date
Application number
PCT/EP2018/070710
Other languages
German (de)
English (en)
Inventor
Jochen Wessner
Martin Katz
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 WO2019030049A1 publication Critical patent/WO2019030049A1/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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
    • F02M21/026—Lift valves, i.e. stem operated valves
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0281—Adapters, sockets or the like to mount injection valves onto engines; Fuel guiding passages between injectors and the air intake system or the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • the invention relates to an injector for gaseous fuels, as it is preferably used to inject gaseous fuels into a combustion chamber of an internal combustion engine.
  • injectors for gaseous fuels have long been known from the prior art.
  • DE 10 2015 219 380 A1 shows an injector for gaseous fuels, wherein this injector can additionally introduce liquid fuels into a combustion chamber of an internal combustion engine.
  • the injection of the gaseous fuel takes place via one or more injection openings, which are opened and closed by a movable valve element.
  • the gaseous fuel emerging from the injection openings is distributed in the combustion chamber of the internal combustion engine and is there brought to the ignition, either by a
  • Spark ignition for example by means of a spark plug, or by the introduction of a liquid fuel, such as diesel fuel, since the diesel fuel is more ignitable than the gaseous fuel.
  • the gaseous fuel As evenly distributed in the combustion chamber of the internal combustion engine, so that in each area of the combustion chamber an optimal mixture of gaseous fuel and the intake air, because only with the right ratio of fuel and oxygen is optimal Combustion.
  • the injection valves will have more injection openings, which aim in different solid angles of the combustion chamber, so that the gaseous fuel is largely uniformly distributed.
  • the gaseous fuel forms club-shaped gas jets, which mix with the air therein and with the oxygen only after a certain time and supported by the swirl flow within the combustion chamber.
  • the injector according to the invention for injecting gaseous fuel into a combustion chamber of an internal combustion engine has the advantage that the exiting gas jets are strongly swirled directly at the exit from the injector and thereby mix easily and quickly with the air in the combustion chamber and an optimal fuel-air -Memisch form, regardless of other devices in the combustion chamber and its geometry.
  • the injector has a nozzle body, in which a pressure chamber is formed, which can be filled with gaseous fuel under a Eindüstik. From the pressure chamber emanates an injection opening through which the gaseous fuel can escape.
  • the deflection body comprises an annular body, on which an edge is formed, which is flowed around by the exiting gas jet.
  • the gas jet preferably strikes the edge with its center, so that there is a strong turbulence of the gas jet at the edge and thus the desired fanning out.
  • the ring body is advantageously secured by webs on the nozzle body, so that it forms a structural unit with the nozzle body, which is mounted together with the injector.
  • the ring body is viewed in cross-section trapezoidal.
  • the edge is formed in a simple manner, at which the gas jet is broken, and the ring body can be made in a simple manner as a rotating part.
  • the deflecting body comprises a rod-shaped element.
  • the rod-shaped element in this case has on its side facing the injection opening in an advantageous manner on a deflection edge, which is hit by the gas jet.
  • the rod-shaped element may be secured by webs on the nozzle body.
  • the rod-shaped element is advantageously triangular or rhombus-shaped when viewed in cross-section, the rombus-shaped embodiment also having the advantage that the gas jet is also guided on the side facing away from the injection openings through the rhombic shape, which reduces the energy lost at the deflection body keeps low.
  • Other shapes, such as a semicircle, are possible as a cross section of the rod-shaped element.
  • the deflecting body comprises two cylinder rods, which are arranged parallel and at a distance from each other.
  • the gas jet is aligned so that it - preferably with its central axis - aims between the two cylinder rods.
  • the distance between the cylinder rods to each other is at least approximately advantageously equal to the diameter of the injection opening, which optimizes the turbulence of the gaseous fuel without too much kinetic energy of the gas jet is lost by the deflection. It can advantageously be provided that a plurality of injection openings are formed in the nozzle body, wherein a deflecting body is arranged in front of each injection opening.
  • This arrangement can be realized with any of the deflecting bodies described above, wherein the deflecting body in the form of an annular body is preferably formed so that the gas jets of all injection openings meet the same edge on the annular body and thus be swirled at this point.
  • FIG. 1a shows a longitudinal section through a schematically illustrated, inventive injector, wherein only the essential components are shown,
  • FIG. 1b shows the same injector as FIG. 1a in cross section
  • FIG. 2a is a longitudinal sectional view of a further exemplary embodiment of an injector according to the invention, wherein parts of the nozzle body have been omitted here for the sake of clarity,
  • FIG. 2b shows a cross section of the injector according to FIG. 2a
  • FIG. 3a shows another example of an injector according to the invention in the same representation as Figure 2a and
  • FIG. 3b again shows a cross section through an injector according to FIG. 3a. Description of the embodiments
  • the injector 1 comprises a nozzle body 2, in which a pressure chamber 4 is formed.
  • the pressure chamber 4 can be filled with a gaseous fuel under a certain injection pressure via a device, not shown in the drawing, wherein the injection pressure is preferably at most 500 bar (50 MPa).
  • the pressure chamber 4 merges at its combustion-chamber-side end into a blind hole 10, from which several injection openings 12 emanate, through which the gaseous fuel can flow.
  • the injection openings 12 are as in
  • nozzle body 2 Essentially radially extending bores are formed in the nozzle body 2 and have a circular shape when viewed in cross-section.
  • a piston-shaped nozzle needle 5 is arranged longitudinally displaceable, the longitudinal axis 7 coincides with the longitudinal axis of the nozzle body 2.
  • the nozzle needle 5 can be moved in its longitudinal direction by a preferably servo-hydraulic device (not shown in the drawing) or by an electromagnet acting directly on the nozzle needle 5.
  • a conical sealing surface 6 is formed on the nozzle needle 5, with which the nozzle needle 5 cooperates with a nozzle seat 8 which is also conical.
  • the nozzle needle 5 When planting the nozzle needle 5 on the nozzle seat 8, the nozzle needle 5 closes the pressure chamber 4 relative to the blind hole 10, so that in this case no gaseous fuel from the pressure chamber 4 flow into the blind hole 10 and can escape through the injection openings 12. If an injection of gaseous fuel happen, then the nozzle needle 5 is moved away in its longitudinal direction from the nozzle seat 8, so that a
  • Flow cross-section between the sealing surface 6 and the nozzle seat 8 is opened, can flow through the gaseous fuel from the pressure chamber 4 into the blind hole 10 and from there into the injection openings 12.
  • a deflecting body 15 is arranged, which is formed in this embodiment by an annular body 18.
  • the annular body 18 surrounds the combustion chamber end of the nozzle body 2 and is connected via webs 17 to the nozzle body 2, so that it forms a unit with the nozzle body 2.
  • the annular body 18 has a trapezoidal shape in cross-section through which an edge 20 at an acute angle at the inner edge the annular body 18 is formed.
  • the edge 20 is arranged so that it lies opposite the injection openings 12 and the gas jet 14 emerging from the injection openings 12 strikes the edge 12 at least with a part of its essentially club-shaped form.
  • the central axis 13 of the injection openings 12 is aligned so that it is aimed at the edge 20.
  • 1 b shows a cross section of the nozzle body or injector 1 shown in FIG. 1 a, which illustrates the arrangement of the injection openings 12, which are distributed over the circumference of the nozzle body 2.
  • the gas jet emerging from the injection opening 12 breaks at the edge 20, so that vortex formation occurs in this area.
  • the gaseous fuel is thereby strongly mixed with the charge air in the combustion chamber in order to rapidly achieve a homogeneous distribution of the gaseous fuel in the combustion chamber.
  • FIG. 2 a shows a further exemplary embodiment of the injector 1 according to the invention.
  • the nozzle body 2 is constructed in the same way as that of the embodiment of Figure la, but the deflecting body 15 is formed here as a rod-shaped element 22.
  • the rod-shaped element 22 also held by a web 17 on the nozzle body 2 and thus forms together with the nozzle body 2 a structural unit.
  • the distance b of the deflection body 15 to the outlet opening of the injection opening 12 preferably corresponds approximately to the length of the injection opening 12, as shown in Figure 2b in a cross section through the injector shown in Figure 2a.
  • FIG. 2b also shows the arrangement of the rod-shaped element 22 in cross section.
  • the cross section of the rod-shaped element 22 can be designed differently.
  • a rod-shaped element 22, 22 ', 22 " each having a different cross-section, is shown:
  • the rod-shaped element 22 shows a substantially triangular cross-section, through which a deflection edge 20 'is formed, which is arranged opposite the injection opening 12, so that the gas jet 14th with its central axis 13 on the deflecting edge 20 'meets.
  • the gas jet 14 emerging from the injection opening 12 is thus divided into two sub-beams and swirled, so that it mixes easily with the air in the combustion chamber.
  • a further rod-shaped element 22 ' is shown, which is formed rhombus-shaped in cross section.
  • the deflecting edge 20 'formed thereby also leads to the formation of two beam halves, which are separated from one another by the edge 20' and at the same time ensure the stability of the rod-shaped element 22 'since the load on the rod-shaped element 22' takes place symmetrically.
  • the rhombic shape ensures that the gas flowing into the combustion chamber mixes with the air in the slipstream of the flow body, since the flow is guided through the side of the rod-shaped element 22 'facing away from the injection opening 12.
  • FIG. 2b shows a third exemplary embodiment with a rod-shaped element 22 ", which is semicircular in cross-section, thereby also dividing the gas jet 14, which flows out of the injection opening 12, into two partial beams rod-shaped element 22 "is on the side facing away from the injection openings 12 caused a strong turbulence, which may be particularly advantageous for relatively small combustion chambers.
  • FIG. 3a shows a third exemplary embodiment of the injector according to the invention in the same illustration as FIG. 2a.
  • the deflection body 15 here comprises two cylinder rods 24, which are likewise fastened to the nozzle body 2 via a web 17.
  • the cylinder rods 24 are arranged parallel to one another and at a distance a from one another, as shown again in FIG. 3b in a cross section through the injector according to FIG. 3a.
  • the central axis 13 of the injection opening 12 is aligned so that it passes between the cylinder rods 24.
  • the distance a between the cylinder rods 24 may be equal to each other as the diameter d of the injection opening 12, in order to achieve an optimum ratio between penetration depth and turbulence.
  • the two cylinder rods 24 lead to a strong turbulence of the gas jet 14 and thus to the desired mixing with the air in the combustion chamber.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur (1) destiné à injecter du carburant gazeux dans une chambre de combustion d'un moteur à combustion interne, comprenant un corps d'injecteur (2) dans lequel est formée une chambre de pression (4) qui peut être remplie de carburant gazeux sous une pression d'injection et de laquelle part une ouverture d'injection (12) à travers laquelle peut s'échapper le carburant gazeux. Un corps de renvoi (15) est disposé devant l'ouverture d'injection (12) de telle sorte qu'au moins une partie du jet de gaz (14) sortant vient frapper le corps de renvoi (15) et le jet de gaz (14) sortant est ainsi dispersé.
PCT/EP2018/070710 2017-08-08 2018-07-31 Injecteur pour carburants gazeux WO2019030049A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017213737.1A DE102017213737A1 (de) 2017-08-08 2017-08-08 Injektor für gasförmige Kraftstoffe
DE102017213737.1 2017-08-08

Publications (1)

Publication Number Publication Date
WO2019030049A1 true WO2019030049A1 (fr) 2019-02-14

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ID=63174197

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/070710 WO2019030049A1 (fr) 2017-08-08 2018-07-31 Injecteur pour carburants gazeux

Country Status (2)

Country Link
DE (1) DE102017213737A1 (fr)
WO (1) WO2019030049A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020006653A1 (de) 2020-10-30 2022-05-05 Daimler Truck AG Injektorhülse für einen Injektor, sowie Einblaseinrichtung und Verbrennungskraftmaschine
DE102020007299B4 (de) 2020-11-30 2022-10-20 Daimler Truck AG lnjektor zum Einbringen, insbesondere zum direkten Einblasen, von gasförmigem Kraftstoff in einen Brennraum einer Verbrennungskraftmaschine, sowie Gasmotor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948485A1 (de) * 1998-04-11 2000-11-16 Tjeerd S Ijsselstein Kraftstoff-Einspritzvorrichtung für Motoroptimierung und Schadstoffreduzierung
EP1467087A1 (fr) * 2003-04-09 2004-10-13 Siemens VDO Automotive S.p.A. Dispositif pour établir le motif de vaporisation d'un jet de liquide pulvérisé et injecteur de carburant avec le dispositif
DE102006039973A1 (de) * 2006-08-25 2008-02-28 Bayerische Motoren Werke Ag Einrichtung und Verfahren zur Bereitstellung eines Kraftstoff-Luft-Gemisches für eine Brennkraftmaschine
DE102014016264A1 (de) * 2014-11-03 2016-05-04 L'orange Gmbh Kraftstoffinjektor
DE102015219380A1 (de) 2015-10-07 2017-04-13 Robert Bosch Gmbh Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Brennstoffs
DE102015224875A1 (de) * 2015-12-10 2017-06-14 Robert Bosch Gmbh Gasinjektor mit Druckausgleichsfunktion
DE102015225216A1 (de) * 2015-12-15 2017-06-22 Robert Bosch Gmbh Injektoranordnung mit Gasinjektor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948485A1 (de) * 1998-04-11 2000-11-16 Tjeerd S Ijsselstein Kraftstoff-Einspritzvorrichtung für Motoroptimierung und Schadstoffreduzierung
EP1467087A1 (fr) * 2003-04-09 2004-10-13 Siemens VDO Automotive S.p.A. Dispositif pour établir le motif de vaporisation d'un jet de liquide pulvérisé et injecteur de carburant avec le dispositif
DE102006039973A1 (de) * 2006-08-25 2008-02-28 Bayerische Motoren Werke Ag Einrichtung und Verfahren zur Bereitstellung eines Kraftstoff-Luft-Gemisches für eine Brennkraftmaschine
DE102014016264A1 (de) * 2014-11-03 2016-05-04 L'orange Gmbh Kraftstoffinjektor
DE102015219380A1 (de) 2015-10-07 2017-04-13 Robert Bosch Gmbh Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Brennstoffs
DE102015224875A1 (de) * 2015-12-10 2017-06-14 Robert Bosch Gmbh Gasinjektor mit Druckausgleichsfunktion
DE102015225216A1 (de) * 2015-12-15 2017-06-22 Robert Bosch Gmbh Injektoranordnung mit Gasinjektor

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Publication number Publication date
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