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EP0646219B1 - Dispositif permettant d'injecter un melange carburant-gaz - Google Patents

Dispositif permettant d'injecter un melange carburant-gaz Download PDF

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Publication number
EP0646219B1
EP0646219B1 EP94911833A EP94911833A EP0646219B1 EP 0646219 B1 EP0646219 B1 EP 0646219B1 EP 94911833 A EP94911833 A EP 94911833A EP 94911833 A EP94911833 A EP 94911833A EP 0646219 B1 EP0646219 B1 EP 0646219B1
Authority
EP
European Patent Office
Prior art keywords
gas
valve
fuel
downstream
spray
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.)
Expired - Lifetime
Application number
EP94911833A
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German (de)
English (en)
Other versions
EP0646219A1 (fr
Inventor
Ferdinand Reiter
Heinz-Martin Krause
Martin Maier
Jürgen Buchholz
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 EP0646219A1 publication Critical patent/EP0646219A1/fr
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Publication of EP0646219B1 publication Critical patent/EP0646219B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F02M61/1853—Orifice plates
    • F02M61/186—Multi-layered orifice plates
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • 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
    • 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
    • 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
    • F02M61/1853—Orifice plates
    • 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
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/047—Injectors peculiar thereto injectors with air chambers, e.g. communicating with atmosphere for aerating the nozzles
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air

Definitions

  • the invention relates to a device for injecting a fuel-gas mixture according to the preamble of the main claim.
  • an injection valve for injecting a fuel-gas mixture (US Pat. No. 4,957,241), in which a spacer plate for influencing the air volume is installed between a nozzle body and a protective cap.
  • the spacer plate between the nozzle body and the protective cap has a central opening into which the downstream pin end of a valve needle is immersed.
  • the air supply to the fuel emerging from a fuel channel takes place via air channels and air chambers.
  • the radial air supply for tapping the valve needle is determined by the height of, for example, four spacer knobs formed on the spacer plate.
  • the amount and the composition of the fuel-air mixture is determined by the size of the annular gap extending in the axial direction between the pin of the valve needle and the circumference of the opening in the spacer plate.
  • the fuel is not one Gas includes so that there is no risk of the fuel jets moving towards each other.
  • injection valves US Pat. No. 4,982,716
  • a baffle is provided downstream of the single spray opening, which is hit by the only sprayed fuel jet and is directed in film form into two spray channels, an air jet being directed onto the fuel films formed after the impact is directed.
  • the device according to the invention for the injection of a fuel-gas mixture with the characterizing features of the main claim represents an easily assembled and easily adjustable possibility for improved preparation of fuel by supplying a fixed amount of gas while maintaining the desired double-jet.
  • the convex beam splitter acts as a flow resistance, which causes a backflow.
  • the ram flow is responsible for the dual radiation that is maintained despite the gas containment also downstream of the beam splitter and the good treatment effect of the gas containment due to an improved mixing of gas and fuel.
  • beam splitters with convex splitter surfaces that have circular, semicircular or elliptical cross sections.
  • the beam splitters have waist-shaped constrictions or bulges with convex divider surfaces.
  • a sheet-metal insert with spacers for example molded-on knobs
  • spacers for example molded-on knobs
  • the gas is metered for improved fuel preparation.
  • the sheet-metal insert is pressed against the spray-perforated disk by a section of the gas-enclosing body which tapers in the shape of a truncated cone upstream and abuts at least partially on a conical area of the sheet-metal insert.
  • the inserted sheet metal insert is pre-centered via tabs that lead radially outwards on the sheet metal insert. The fine adjustment is achieved by pressing the gas enclosing body.
  • a cone difference angle formed between the sheet metal insert and the gas encasing body ensures an axial tolerance compensation with respect to the sheet metal insert and the gas encasing body with respect to the spray hole disk. Because of this Jamming and the cone difference angle associated therewith a seal is achieved so that fuel cannot penetrate into gas-carrying channels and flow channels.
  • FIG. 1 shows a partially illustrated device for injecting a fuel-gas mixture according to a first exemplary embodiment according to the invention
  • FIG. 2 shows an enlarged detail from FIG. 1
  • FIG. 3 shows an effect of a beam splitter with a convex splitter surface
  • FIGS. 4 to 6 show exemplary embodiments for the design 4a to 6a top views of the spraying chambers shown in FIGS. 4 to 6, FIGS. 7 to 17 as middle cross sections, design examples for the formation of convex beam splitters, and FIGS. 7a to 17a top views of the beam splitters shown in FIGS. 7 to 17.
  • the injection valve has a tubular valve seat support 1, in which is concentric with one Longitudinal valve axis 2, a longitudinal opening 3 is formed.
  • an, for example, tubular valve needle 5 Arranged in the longitudinal opening 3 is an, for example, tubular valve needle 5, which is connected at its downstream end 6 to an, for example, spherical valve closing body 7, on the circumference of which, for example, five flats 8 are provided.
  • the injection valve is actuated in a known manner, for example electromagnetically.
  • An indicated electromagnetic circuit with a magnet coil 10, an armature 11 and a core 12 serves for the axial movement of the valve needle 5 and thus for opening against the spring force of a return spring (not shown) or closing the injection valve.
  • the armature 11 is facing away from the valve closing body 7 End of the valve needle 5 by, for example a weld seam is connected by means of a laser and aligned with the core 12.
  • the magnet coil 10 surrounds the core 12, which represents, for example, the end of an inlet connection piece (not shown in more detail) which surrounds the magnet coil 10 and which serves to supply the medium to be metered by means of the valve, here fuel.
  • a guide opening 15 of a valve seat body 16 serves to guide the valve closing body 7 during the axial movement.
  • the cylindrical valve seat body 16 In the downstream end of the valve seat carrier 1 facing away from the core, the cylindrical valve seat body 16 is tightly mounted in the longitudinal opening 3 concentric to the longitudinal axis 2 of the valve by welding.
  • the circumference of the valve seat body 16 has a slightly smaller diameter than the longitudinal opening 3 of the valve seat carrier 1.
  • the Valve closing body 7 facing away from the lower end face 17, the valve seat body 16 is concentrically and firmly connected to a bottom part 20 of a, for example, cup-shaped injection orifice plate 21, so that the bottom end face 20 of the bottom part 20 abuts the lower end face 17 of the valve seat body 16.
  • valve seat body 16 and spray perforated disk 21 takes place, for example, by means of a circumferential and tight first weld seam 22, formed for example by means of a laser, on the base part 20 , avoided by punching or eroding molded injection openings 25, which are located in a central region 24 of the bottom part 20.
  • a circumferential retaining edge 26 which extends in the axial direction away from the valve seat body 16 and is conically bent outwards up to its downstream end.
  • the holding edge 26 has a larger diameter at its end than the diameter of the longitudinal opening 3 of the valve seat carrier 1. Since the circumferential diameter of the valve seat body 16 is smaller than the diameter of the longitudinal opening 3 of the valve seat carrier 1, it lies only between the longitudinal opening 3 and the slightly conical outwardly bent holding edge 26 of the spray plate 21 a radial pressure.
  • the holding edge 26 exerts a radial spring action on the wall of the longitudinal opening 3.
  • the insertion depth of the valve seat part consisting of valve seat body 16 and cup-shaped spray orifice disk 21 into the longitudinal opening 3 determines the presetting of the stroke of the valve needle 5, since the one end position of the valve needle 5 when the solenoid coil 10 is not excited due to the valve closing body 7 resting on a valve seat surface 29 of the valve seat body 16 is set.
  • the other end position of the valve needle 5 is determined when the solenoid 10 is excited, for example by the armature 11 resting on the core 12. The path between these two end positions of the valve needle 5 thus represents the stroke.
  • the holding edge 26 of the spray plate 21 is connected to the wall of the longitudinal opening 3, for example by a circumferential and tight second weld seam 30.
  • the second weld 30 is formed like the first weld 22, for example by means of a laser. The parts to be welded are only slightly heated during laser welding and the process is safe and reliable.
  • a tight welding of the valve seat body 16 and the spray hole disk 21 and of the spray hole disk 21 and the valve seat support 1 is required so that the fuel does not pass between the longitudinal opening 3 of the valve seat support 1 and the circumference of the valve seat body 16 to the spray openings 25 or between the longitudinal opening 3 of the valve seat support 1 and the holding edge 26 of the cup-shaped spray perforated disk 21 therethrough can flow directly into an intake line of the internal combustion engine. Because of the two weld seams 22 and 30, there are consequently two fastening points on the cup-shaped spray perforated disk 21.
  • the spherical valve closing body 7 interacts with the valve seat surface 29 of the valve seat body 16 which tapers in the shape of a truncated cone in the flow direction and is formed in the axial direction between the guide opening 15 and the lower end face 17 of the valve seat body 16.
  • the valve seat body 16, facing the solenoid 10 has a valve seat body opening 33 which has a larger diameter than the guide opening 15 of the valve seat body 16.
  • a section 34 which adjoins the valve seat body opening 33 in the direction of the spray orifice disk 21 is distinguished by its frustoconical tapering up to the diameter of Guide opening 15 from.
  • valve seat body opening 33 with its subsequent frustoconical section 34 serves as a flow inlet so that a flow of the medium can take place from a valve interior 35 limited in the radial direction through the longitudinal opening 3 of the valve seat carrier 1 to the guide opening 15 of the valve seat body 16.
  • the diameter of the guide opening 15 is designed such that the spherical valve closing body 7 projects through the guide opening 15 outside of its flattened portions 8 with a small radial distance.
  • the valve seat support 1 is at least partially surrounded radially and axially by a stepped concentric gas-enclosing body 41.
  • the gas containment body 41 made of a plastic includes, for example, both the actual gas containment at the downstream end of the valve seat support 1 and a gas inlet channel, not shown, which serves to supply the gas into the gas containment body 41 and is, for example, formed in one piece with the gas containment body 41.
  • An axially extending, tubular section 43 of the gas encasing body 41 which is connected, for example, to a plastic encapsulation of the injection valve in the axial direction between the magnet coil 10 and the valve closing body 7 by ultrasonic welding, is followed by a section 44 tapering downstream.
  • This conical section 44 is, for example, also stepped.
  • the formation of the gas enclosing body 41 in this area can be varied in accordance with the spatial conditions of a valve receptacle, not shown.
  • the section 44 is followed downstream by an axially extending tubular section 45 of the gas enclosing body 41, which, however, is distinguished by a much smaller diameter than in the section 43.
  • the axial section 45 surrounds this downstream end of the valve seat support 1 both directly adjacent and at a radial distance from the supply of the gas up to the fuel emerging from the spray openings 25 of the spray plate 21.
  • the walls are therefore less strong than in the entire other peripheral area.
  • the reduction in the wall thickness of the gas containment body 41 in section 45 has the result that, for example, three to six gas inlet channels 48 are formed between the valve seat support 1 and the gas containment body 41, which, for example, regularly run axially at equal intervals around the circumference of the valve seat support 1, for example with three gas inlet channels 48 offset by 120 ° or with six gas inlet channels 48 offset by 60 °.
  • the section 45 of the gas enclosing body 41 is designed in such a way that first chamfers 49 are formed in the areas of the gas inlet channels 48 and extend axially over the entire length of the gas inlet channels 48.
  • the section 45 of the gas enclosing body 41 has second chamfers 50 at its upstream end, which are integrally formed only on the circumference outside the gas inlet channels 48 and which simplify assembly when the gas enclosing body 41 is pushed on from the downstream side onto the valve seat carrier 1 and thus onto the injection valve enable.
  • the axially extending section 45 has at its upstream and downstream ends a radially outward-facing circumferential shoulder 52, 53, which together with the outer wall of section 45 form an annular groove 55.
  • a sealing ring 56 is arranged in the annular groove 55, the Side surfaces are formed by the downstream side of the shoulder 52 and the upstream side of the shoulder 53 and the groove base 58 thereof by the outer wall of the section 45 of the gas encasing body 41.
  • the sealing ring 56 serves to seal between the circumference of the injection valve with the gas encasing body 41 and a valve receptacle, not shown, for example the intake line of the internal combustion engine or a so-called fuel and / or gas distribution line.
  • the valve seat carrier 1 has an outer circumferential taper 60 and an inner circumferential taper 61, against which no other components are in contact and which are intended to improve the assembly of the gas encasing body 41 on the injection valve, while on a downstream end face 62 of the valve seat carrier 1, the gas encasing body 41 with a radially extending section 63 in the areas outside the gas inlet channels 48.
  • the axially extending gas inlet channels 48 are followed, for example, by as many, for example three to six, radially extending flow channels 64 between the radially extending section 63 of the gas enclosing body 41 and the downstream end face 62 of the valve seat carrier 1 arise after the assembly of the gas enclosing body 41 and the gas flows radially through it.
  • the gas then flows axially upstream into an annular channel 65 between a last concentric section 68 of the gas enclosing body 41 which tapers in the shape of a truncated cone upstream and the wall of the longitudinal opening 3 in the valve seat support 1 until it is deflected Kung the flow at a lower end face 69 of the bottom part 20 of the spray plate 21 in the radial direction.
  • the gas-enclosing body 41 presses at least partially with an outer surface 70 of its section 68, which projects into the injection valve and thus into the valve seat support 1 in the direction of the orifice plate 21, against an inner surface 72 of a tapered and circumferential region 73 of a sheet metal insert 74, which in turn on the lower end face 69 of the bottom part 20 of the spray plate 21 with spacers, for example knobs 75, abuts.
  • spacers for example knobs 75
  • the sheet metal insert 74 is formed by a radial region 77 with a mixture spray opening 78 running in it centrally and concentrically to the longitudinal valve axis 2, the conical region 73 and thus obliquely to the longitudinal valve axis 2 and, for example, three radially outward-facing regions which adjoin the conical region 73 downstream Tabs 80 formed.
  • the knobs 75 are formed at at least three, then offset by 120 °, which have an axial extension in the direction of the spray-perforated disk 21 and touch them point-wise on their lower end face 69 after the installation of the gas-enclosing body 41.
  • knobs 75 of the sheet metal insert 74 With the knobs 75 of the sheet metal insert 74, an axial distance dimension between the lower end face 69 of the spray perforated disc 21 and an upper end face 81 of the radial region 77 of the sheet-metal insert 74 facing the perforated disk 21, which corresponds to the axial height of the knobs 75 and thus the axial extent of a gas ring gap 83 formed thereby.
  • the knobs 75 of the sheet metal insert 74 are introduced, for example, by embossing processes, since this allows desired, very small tolerances in the axial extent to be maintained.
  • the axial dimension of the extent of the gas ring gap 83 forms the metering cross section for the gas flowing in from the ring channel 65, for example treatment air.
  • the gas ring gap 83 serves to supply the gas to the fuel discharged through the spray openings 25 of the spray orifice plate 21 and to meter the gas.
  • the gas supplied through the gas inlet channels 48, the flow channels 64 and the ring channels 65 flows through the narrow gas ring gap 83 to the mixture spray opening 78 and meets the fuel discharged through the two or four spray openings 25, for example. Due to the small axial extent of the gas ring gap 83 predetermined by the knobs 75, the gas supplied is greatly accelerated and atomizes the fuel particularly finely.
  • the suction air diverted by a bypass in front of a throttle valve in the intake manifold of the internal combustion engine, air conveyed by an additional blower, but also recirculated exhaust gas from the internal combustion engine or a mixture of air and exhaust gas can be used as gas.
  • the mixture spray opening 78 in the radial region 77 of the sheet metal insert 74 has such a large diameter that it flows upstream from the spray openings 75 of the spray orifice plate 21 Escaping fuel, which the gas comes vertically from the gas ring gap 83 for better processing, can escape unhindered through the mixture spray opening 78 of the sheet metal insert 74.
  • the sheet-metal insert 74 is pressed against the spray-perforated disk 21 by the upstream frustoconical section 68 of the gas encasing body 41, which at least partially abuts the inner surface 72 of the conical region 73 of the sheet-metal insert 74.
  • FIG. 2 clearly illustrates this clamping area as an enlarged detail from FIG. 1.
  • the sheet metal insert 74 is designed in such a way that, for example, three tabs 80 (FIG. 1) adjoin the area 73 downstream, which serve to pre-center the sheet metal insert 74 in the valve seat support 1.
  • the tabs 80 have radial end surfaces 85, which are achieved, for example, by smooth stamping and are of good quality with regard to their surface roughness.
  • the pre-centered sheet metal insert 74 is finely adjusted with the help of the gas encasing body 41 pressing against the conical area 73 of the sheet metal insert 74. In this case, there is a line contact between the gas encasing body 41 and the sheet metal insert 74, which, upon further insertion of the frustoconical section 68 of the gas encasing body 41, is pushed upstream a surface contact. Between the outer surface 70 of the portion 68 of the gas containment body 41 and the inner surface 72 of the area 73 of the sheet metal insert 74 inevitably creates a cone difference angle ⁇ .
  • This cone difference angle ⁇ ensures an axial tolerance compensation with respect to the sheet metal insert 74 and the gas encasing body 41 with respect to the spray perforated disk 21.
  • a beam splitter 86 is provided in the gas containment body 41 downstream of the mixture spray opening 78 of the sheet metal insert 74.
  • the beam splitter 86 extends transversely through the longitudinal valve axis 2 and symmetrically divides a spray chamber 87 formed by the gas enclosing body 41 downstream of the mixture spray opening 78.
  • the spray chamber 87 can first be cylindrical in accordance with the design of the gas-enclosing body 41 in the flow direction and then conical, or it can be continuously cylindrical or elliptical.
  • the beam splitter 86 is located, for example, at the same height as the radially extending section 63 of the gas enclosing body 41, which thus also represents the connection of two points of the section 63 which are 180 ° apart.
  • the beam splitter 86 can both be part of the gas enclosing body 41 made of plastic as a web, and can also be installed, for example, as a pin made of another material.
  • Crucial in the design of the beam splitter 86 is the formation of an upper, upstream, convex splitter surface 88.
  • FIG. 3 is intended to illustrate the effect of the beam splitter 86 with its convex splitter surface 88 in the case of two-jet valves with gas enclosures.
  • Two or four fuel jets are generated through the two or four spray orifices 25 in the spray orifice plate 21 and are sprayed into areas formed on both sides of the beam splitter 86 in the spraying chamber 87.
  • the configuration of the jet splitter 86 according to the invention is useful not only in the case of individual fuel jets directed onto the jet splitter 86, but also when the fuel jets run past the jet splitter 86 or when they also move away from one another with increasing distance from the spray openings 25.
  • the fuel jets are hit vertically by the gas flowing out of the gas ring gap 83 immediately after they emerge from the spray openings 25.
  • the consequence of this is that the dual-jet nature of the fuel jets is endangered by the gas enclosure and the two fuel jets can even merge, since the gas moves the fuel jets towards one another, as indicated by the dotted lines 90.
  • gas is jammed in the beam splitters 86 with a convex splitter surface 88 above the splitter surface 88, the fuel jets being pushed outwards again by the back pressure of the gas, and thus a clear double-jet radiation remains.
  • the dash-dot lines 91 show fuel jet profiles in two-jet valves without gas containment.
  • the convex splitter surface 88 of the beam splitter 86 ensures that an equally good double radiation is created in the axial direction downstream from the beam splitter 86, despite the gas enclosure.
  • the transition from the dotted line 90 to the dash-dotted line 91 is intended to illustrate this.
  • FIGS. 4 to 6 and 4a to 6a schematically show exemplary embodiments for the design of the spray chamber 87 surrounded by the gas-enclosing body 41 with a beam splitter 86 which has a circular cross section.
  • the embodiment 4 illustrates a cylindrical spray chamber 87 in the area of the beam splitter 86
  • FIG. 5 shows a conical spray chamber 87, as can also be seen in FIGS. 1 and 3
  • FIG. 6 shows an elliptical spray chamber 87.
  • FIGS. 4a to 6a show top views the spraying chambers 87 shown in Figures 4 to 6.
  • some possible design variants of the convex beam splitters 86 are simplified and shown schematically as cross sections or top views.
  • the convex splitter surface 88 is decisive in the configuration of the beam splitter 86.
  • the variants shown allow different beam angles of the fuel-gas mixture.
  • beam splitters 86 are also conceivable, which have waist-shaped constrictions (FIGS. 9, 9a, 10, 10a, 14, 14a, 15, 15a) transverse to the flow, for example in their central region, for small beam angles or bulges (FIGS. 16, 16a, 17, 17a) for larger beam angles.

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

Abstract

On connaît les dipositifs permettant d'injecter un mélange carburant-gaz qui comportent une enveloppe gazeuse et qui entourent partiellement dans le sens radial et axial l'extrémité de la soupape d'injection, située en aval. On connaît en outre plusieurs modes de réalisation de séparateurs de jet ou de surfaces de déviation sur lesquels le carburant pulvérisé est dévié sans adjonction de gaz. Comparativement à ce type de dispositifs, ce nouveau dispositif comprend un séparateur de jet (86) muni d'une surface de séparation (88) convexe faisant face à un disque d'injection ajouré (21). Le séparateur de jet (86) convexe provoque une résistance hydraulique qui produit un flux dynamique. Le flux dynamique est responsable, en dépit de l'enveloppe gazeuse, du maintien de la fonction multijet également en aval du séparateur de jet (86) et de l'action efficace de la préparation de l'enveloppe gazeuse grâce à un mélange amélioré de gaz et de carburant. Ce dispositif d'injection d'un mélange carburant-gaz s'utilise notamment pour l'injection d'un tel mélange dans le collecteur d'admission d'un moteur à combustion interne à allumage par appareillage externe et à compression du mélange.

Claims (18)

  1. Dispositif pour injecter un mélange carburant-gaz comprenant un injecteur notamment un injecteur de carburant à commande électromagnétique pour des installations d'injection de carburant de moteur à combustion interne, ayant un axe longitudinal d'injecteur (2), un organe d'obturateur d'injecteur (7), un corps formant siège d'injecteur (16) prévu à l'extrémité aval de l'injecteur et qui possède une surface formant siège de soupape coopérant avec l'organe d'obturation de soupape, une rondelle (21) à orifices d'éjection comportant au moins deux orifices d'éjection (25), un organe formant garniture à gaz (4) qui entoure au moins partiellement, axialement et au moins partiellement, radialement l'extrémité aval de l'injecteur avec la rondelle à orifices d'éjection, un orifice d'éjection de mélange (78) pour la sortie du mélange carburant-gaz,
    caractérisé en ce qu'
    en aval de l'orifice d'éjection (78) du mélange, il est prévu un diviseur de faisceau (86) possédant transversalement à l'axe longitudinal (2) de l'injecteur et traversant celui-ci, en étant tourné vers le disque à orifices d'éjection (21), une surface de division (88) convexe, qui produit un écoulement dynamique, si bien que malgré la garniture, des jets de carburant éjectés suivant plusieurs jets des orifices d'éjection (25) restent conservés même en aval du diviseur de jet (86).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    l'orifice d'éjection de mélange (78) est prévu dans un insert en tôle (74) qui représente une pièce distincte de l'organe formant garniture (41).
  3. Dispositif selon la revendication 2,
    caractérisé en ce que
    la pièce formant insert en tôle (74) a une forme tronconique et dans une zone radiale (77) se trouve l'orifice d'éjection (78) du mélange, une zone (73) dirigée de manière conique et qui se rétrécit en étant tournée vers le disque à orifices d'éjection (21), fait suite à la zone radiale (77), en aval.
  4. Dispositif selon la revendication 2,
    caractérisé en ce que
    l'insert en tôle ((74) possède des bossages (75) tournés dans la direction axiale vers le disque à orifices d'éjection (21), bossages dont la hauteur axiale forme un intervalle annulaire à gaz (83) entre le disque à orifices d'éjection (21) et l'insert en tôle (74), servant de section de dosage du gaz fourni.
  5. Dispositif selon la revendication 3,
    caractérisé en ce que
    l'insert en tôle (74) est pincé entre l'organe formant garniture (41) et la rondelle à orifices d'éjection (21).
  6. Dispositif selon la revendication 5,
    caractérisé en ce que
    le pincement de l'insert en tôle (74) est effectué dans la zone conique (73) de l'organe formant garniture (41).
  7. Dispositif selon la revendication 1,
    caractérisé en ce que
    le diviseur de faisceau (86) constitue comme branche, une partie de l'organe formant garniture (41).
  8. Dispositif selon la revendication 1,
    caractérisé en ce que
    le diviseur de faisceau (86) est une pièce distincte et est fixée dans l'organe formant garniture (41).
  9. Dispositif selon la revendication 1,
    caractérisé en ce que
    le diviseur de faisceau (86) a une section circulaire.
  10. Dispositif selon la revendication 1,
    caractérisé en ce que
    le diviseur de faisceau (86) a une section semi-circulaire.
  11. Dispositif selon la revendication 1,
    caractérisé en ce que
    le diviseur de faisceau (86) a une section elliptique.
  12. Dispositif selon la revendication 1,
    caractérisé en ce que
    le diviseur de faisceau (86) a une section semi-elliptique.
  13. Dispositif selon la revendication 1,
    caractérisé en ce que
    le diviseur de faisceau (86) a au moins un rétrécissement formant une taille
  14. Dispositif selon la revendication 1,
    caractérisé en ce que
    le diviseur de faisceau (86) comporte au moins une partie bombée.
  15. Dispositif selon la revendication 1,
    caractérisé en ce qu'
    en aval de l'orifice d'éjection (78) du mélange, se situe une chambre d'éjection (86) de forme cylindrique dans la direction de l'écoulement et qui loge le diviseur de faisceau (86).
  16. Dispositif selon la revendication 1,
    caractérisé en ce qu'
    en aval de l'orifice d'éjection de mélange (78) se situe une chambre d'éjection (87) qui s'élargit dans la direction de l'écoulement et comporte un diviseur de faisceau (86).
  17. Dispositif selon la revendication 1,
    caractérisé en ce qu'
    en aval de l'orifice d'éjection de mélange (78) se situe une chambre d'éjection (87) de forme elliptique dans la direction de l'écoulement et qui contient le diviseur de faisceau (86).
  18. Dispositif selon la revendication 1,
    caractérisé en ce qu'
    en aval de l'orifice d'éjection (78) du mélange, se situe une chambre d'éjection (87) entourée par l'organe formant garniture (41).
EP94911833A 1993-04-20 1994-04-07 Dispositif permettant d'injecter un melange carburant-gaz Expired - Lifetime EP0646219B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4312756A DE4312756A1 (de) 1993-04-20 1993-04-20 Vorrichtung zur Einspritzung eines Brennstoff-Gas-Gemisches
DE4312756 1993-04-20
PCT/DE1994/000386 WO1994024434A1 (fr) 1993-04-20 1994-04-07 Dispositif permettant d'injecter un melange carburant-gaz

Publications (2)

Publication Number Publication Date
EP0646219A1 EP0646219A1 (fr) 1995-04-05
EP0646219B1 true EP0646219B1 (fr) 1997-02-12

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Application Number Title Priority Date Filing Date
EP94911833A Expired - Lifetime EP0646219B1 (fr) 1993-04-20 1994-04-07 Dispositif permettant d'injecter un melange carburant-gaz

Country Status (7)

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US (1) US5540387A (fr)
EP (1) EP0646219B1 (fr)
JP (1) JP3523256B2 (fr)
KR (1) KR100327077B1 (fr)
BR (1) BR9405166A (fr)
DE (2) DE4312756A1 (fr)
WO (1) WO1994024434A1 (fr)

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Also Published As

Publication number Publication date
KR100327077B1 (ko) 2002-06-28
JPH07508334A (ja) 1995-09-14
US5540387A (en) 1996-07-30
EP0646219A1 (fr) 1995-04-05
JP3523256B2 (ja) 2004-04-26
DE4312756A1 (de) 1994-10-27
DE59401799D1 (de) 1997-03-27
WO1994024434A1 (fr) 1994-10-27
BR9405166A (pt) 1999-06-15

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