EP0844386B1 - Dispositif d'injection d'un mélange combustible/gaz - Google Patents

Dispositif d'injection d'un mélange combustible/gaz Download PDF

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Publication number
EP0844386B1
EP0844386B1 EP97116702A EP97116702A EP0844386B1 EP 0844386 B1 EP0844386 B1 EP 0844386B1 EP 97116702 A EP97116702 A EP 97116702A EP 97116702 A EP97116702 A EP 97116702A EP 0844386 B1 EP0844386 B1 EP 0844386B1
Authority
EP
European Patent Office
Prior art keywords
opening
valve
gas
fuel
downstream
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
EP97116702A
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German (de)
English (en)
Other versions
EP0844386A1 (fr
Inventor
Stefan Dipl.-Physiker Arndt
Achim Dipl.-Ing. Degel (Th)
Heinz-Martin Dipl.-Ing. Krause (Fh)
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
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 EP0844386A1 publication Critical patent/EP0844386A1/fr
Application granted granted Critical
Publication of EP0844386B1 publication Critical patent/EP0844386B1/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
    • 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

Definitions

  • the invention relates to a device for Injection of a fuel-gas mixture according to the genus of the main claim. It's already an electromagnetic actuable valve for the injection of a fuel-gas mixture into a mixture compression-ignition Internal combustion engine known from DE-OS 1 95 05 886, at a gas enclosing body partially the injector surrounds. Within the gas containment body is on downstream end of the injector Processing attachment provided, which consists of a cup-shaped gas enclosing part and an insert body consists. One runs inside the insert body at least partially tapered in the downstream direction widening opening that can end at a drainer.
  • the drip-off crown has a number of serrations or Teeth that are at the same inclination as the conical Opening, i.e. diagonally to the valve longitudinal axis, downstream expanding, running.
  • the oblique teeth make that possible Form an edge mist that is detrimental to one Wall film formation in the intake pipe leads.
  • the device according to the invention for the injection of a Fuel-gas mixture with the characteristic features of the main claim has the advantage that in a simple manner and Way an improved spray geometry is achieved, by edge mist at the downstream end of the injector largely avoided, which is a blur in that Bring spray pattern.
  • This is achieved in that a Processing attachment at the downstream end of the Injector is arranged with a drip-off crown is provided which is a variety of axially parallel aligned teeth.
  • Those pips of the Drip-off crowns constrict the fuel, the marginal fog largely prevented and to reduce the Probability of the formation of large drops contributes.
  • the consequence can be a significant reduction in Wall film formation can be achieved in the intake pipe, which in turn a reduction in exhaust gas emissions from an internal combustion engine has the consequence.
  • beam splitters use convex divider surfaces that are circular, have semicircular or elliptical cross sections.
  • the convex beam splitter acts as a drag, causing a ram flow is caused.
  • the ram flow is responsible for maintaining despite gas containment Multiple beams also downstream of the beam splitter and good treatment effect of the gas containment by a improved mixing of gas and fuel.
  • FIG. 1 shows a partially shown device for injecting a Fuel-gas mixture
  • Figure 2 shows a first example of a Processing attachment
  • Figure 3 is a bottom view of the Processing attachment according to Figure 2 and Figure 4, a second Example of a preparation header.
  • a valve is shown in FIG. 1 as an exemplary embodiment the shape of an injector for Fuel injection systems from mixture compressors spark-ignited internal combustion engines partially and simplified shown.
  • the injector has a tubular one Valve seat support 1, in the concentric to one Longitudinal valve axis 2, a longitudinal opening 3 is formed.
  • a longitudinal opening 3 is formed in the longitudinal opening 3 in the longitudinal opening 3 e.g. tubular valve needle 5 arranged at its downstream end 6 with a e.g. spherical valve closing body 7, on the circumference
  • five flats 8 are provided is.
  • the injection valve is actuated in a known manner Way, for example electromagnetic.
  • a magnetic coil 10 for example, one Anchor 11 and a core 12.
  • the anchor 11 is with the End of valve needle 5 facing away from valve closing body 7 through z. B. connected a weld using a laser and aligned with the core 12.
  • the magnet coil 10 surrounds the core 12, which, for example, is characterized by the Solenoid 10 enclosing end of a not shown Inlet nozzle represents the supply of the by means of Valve to be metered medium, here fuel, is used.
  • Valve seat body 16 To guide the valve closing body 7 during the A guide opening 15 serves for axial movement Valve seat body 16.
  • the core opposite end of the valve seat support 1 is in the concentric to the longitudinal valve axis 2 longitudinal opening 3 of the cylindrical valve seat body 16 tightly mounted.
  • the lower valve closure body 7 facing away The end face is the valve seat body 16 with a for example, cup-shaped spray plate 21 concentrically and firmly connected.
  • the connection of Valve seat body 16 and spray orifice plate 21 takes place for example by a circumferential and dense, e.g. by means of laser-welded seam.
  • Spray plate 21 is also with the valve seat bracket 1st for example by a circumferential and tight weld seam firmly connected.
  • the insertion depth of the valve seat body 16 and pot-shaped spray plate 21 existing valve seat part in the longitudinal opening 3 determines the size of the stroke Valve needle 5, since the one end position of the valve needle 5 at non-excited solenoid 10 by the system of Valve closing body 7 on a valve seat surface 29 of the Valve seat body 16 is fixed.
  • the other end position the valve needle 5 is when the solenoid 10 is excited for example by the anchor 11 resting against the core 12 established.
  • the path between these two end positions Valve needle 5 thus represents the stroke.
  • the spherical valve closing body 7 acts with the in Direction of flow tapering in the shape of a truncated cone Valve seat surface 29 of the valve seat body 16 together, which in axial direction between the guide opening 15 and the lower end face of the valve seat body 16 is formed.
  • the z. B. is formed from a plastic, belong for example, both the actual gas enclosure on downstream end of the valve seat support 1 as well Gas inlet channel, not shown, which the supply of Serves gas in the gas containment body 41 and for example is formed in one piece with the gas enclosing body 41.
  • the Gas enclosing body 41 is largely tubular and for example with a plastic extrusion of the Injector in the axial direction between the solenoid 10 and the valve closing body 7 by ultrasonic welding connected.
  • the gas enclosing body 41 sits z. B. from several axially consecutive sections different diameters together. On the downstream At the end, the gas enclosing body 41 surrounds a cup-shaped one Gas containment part 48 in a between the Gasum embracing body 41 and the valve seat support 1 formed, directly connected to the gas inlet duct Gap 50. Thus, the supply of the gas is cut off the spray openings 25 of the spray plate 21st escaping fuel guaranteed.
  • the cup-shaped gas encasing part 48 as a sheet metal part through the gas enclosing body 41 in completely enclosed in the axial direction Processing attachment 61.
  • the insert body 60 which is characterized by is characterized by a largely conical shape completely downstream of the valve seat body 16. Against is that firmly connected to the insert body 60 Gas enclosing part 48 formed so that a bottom portion 63 at least in part due to the material of the insert body 60 is surrounded and radially from this, for example via the seen axial length of the insert body 60 protrudes in the middle.
  • a cylindrical, axially extending jacket section 64 which in upstream direction the valve seat support 1 z. B.
  • the jacket section 64 of the Gas containment portion 48 extends between the Gasum embracing body 41 and the valve seat support 1 formed Space 50 and guaranteed by its constructive Training a defined gas supply.
  • the jacket section 64 is not completely cylindrical in that he z. B. four areas 66 of larger diameter and four Has areas 67 of smaller diameter, which are in Alternate circumferential direction of the jacket section 64.
  • the annular space 50 in its entire radial width is used because the regions 67 smaller diameter on the valve seat support 1 and z. B. firmly connected to this by means of welds 69 are, while the areas 66 of larger diameter with Play along the inner wall of the gas containment body 41 extend.
  • the number of these areas 66 is the same number, for example four gas inlet passages 70 formed at equal intervals arranged axially in the circumferential direction around the valve seat support 1 run.
  • the arrows in Figure 1 illustrate the Flow direction of the gas.
  • the bottom portion 63 of the Gas enclosing part 48 runs at an axial distance a downstream end face 72 of the valve seat support 1, so that between the bottom portion 63 and the end face 72nd an annular, radially extending flow channel 73 arises, which connects to the gas inlet channels 70 and is radially flowed through by the gas.
  • the metering of the gas for improved treatment of the the spray openings 25 of the spray plate 21st escaping fuel takes place via a gas ring gap 76, whose axial extent is determined by the distance of the Insert body 60 from the spray plate 21 results.
  • the axial dimension of the extent of the gas ring gap 76 forms the Metering cross section for the inflowing from the ring channel 74 Gas, for example treatment air. That through the Gas inlet channels 70, the flow channel 73 and the annular channel 74 supplied gas flows in through the narrow gas ring gap 76 one in the insert body 60 in the middle and concentrically Longitudinal valve axis 2 and near the spray orifice plate 21 provided mixture spray opening 78 and hits there through two or four spray orifices, for example 25 fuel delivered. Due to the low axial Extension of the gas ring gap 76 becomes the supplied gas strongly accelerates and atomizes the fuel especially fine.
  • the insert body 60 is designed such that in its interior to the mixture spray opening 78 in Cross section e.g. elliptical or circular and in axial opening 79 in the downstream direction that has a larger opening width than that Mixture spray opening 78.
  • This opening 79 in the insert body 60 is e.g. B. trained several times and is for example of a circular cross section possessing, pen-like beam splitter 80 crossed crosswise.
  • the beam splitter 80 runs across the longitudinal axis of the valve 2 and divides one formed by the opening 79 Spray chamber 82 downstream of the mixture spray opening 78 symmetrical.
  • the beam splitter 80 can e.g. B. a be a pin-shaped installation part.
  • the beam splitter 80 has one upper, upstream, convex divider surface 85.
  • the convex beam splitter 80 acts as a flow resistance, causing a ram flow.
  • the flow of traffic is responsible for a very compact beam splitting in the Area of the beam splitter 80 and good Treatment effect of the gas containment through an improved Mixing of gas and fuel.
  • Through the convex Splitter area 85 of the beam splitter 80 is achieved in axial direction downstream from the beam splitter 80 despite the gas enclosure has an equally good double radiation an arrangement without gas containment is created.
  • a sealing ring 87 provides a seal between the Gasum body 41 and the insert body 60 between the Outer contour of the insert body 60 and the inner wall of the Gasum embracing body 41 below the bottom portion 63.
  • Der Insert body 60 is characterized by a special Draining geometry at the downstream end of the Processing attachment 61.
  • One downstream on the lower drip crown 90 with a Variety of prongs 91 ensures an improved Dripping behavior (especially when operating without gas) of the Fuel because the fuel does not drop too large can converge.
  • the prongs 91 are for example in the Formed by triangular teeth, which in tapering downstream, whereas the free areas between the prongs 91 are reversed are triangular, i.e. wider in the downstream direction become.
  • FIG. 2 shows the preparation attachment 61 again the insert body 60 according to the invention changed scale.
  • the opening 79 inside the Insert body 60 is divided into several sections. Immediately adjoins the mixture spray opening 78 downstream a circular or elliptical Opening section 79a with a larger cross section, the Wall runs parallel to the longitudinal axis 2 of the valve.
  • This first opening section 79a goes e.g. B. in the amount of Bottom portion 63 into a conical, downstream expanding opening portion 79b. That first one Conical opening section 79b still follow, for example two further conical opening sections 79c and 79d downstream, the z. B. all the same wall slope Have valve longitudinal axis 2.
  • the transitions of the individual Opening sections 79b, 79c and 79d represent e.g. B. minor paragraphs 93, so that in addition to the largely conical design of the opening 79 also a graded, radially expanding inner contour results.
  • the third opening section 79c is, for example Beam splitter 80 arranged. Paragraphs 93 serve as Tear edges for the fuel.
  • the treatment attachment 61 is suitable for the beam splitter 80 especially for use in gas-enclosed double-jet valves.
  • the inner wall of the drip-off crown 90 closes with respect the opening width seamlessly to the conical opening 79 or the opening portion 79d in the insert body 60.
  • the number of shoulders 93 or opening sections 79a, 79b, 79c, 79d can be used in various embodiments vary. It is also conceivable that three, four, five or even more paragraphs 93 are provided in the opening 79.
  • the axial extension length of the individual opening sections 79a, 79b, 79c, 79d can vary as well Tilt angle of the walls of individual opening sections 79b, 79c, 79d to the valve longitudinal axis 2.
  • the largely overall conical formation of the opening 79 is also in Keep in case of changing wall inclinations. Through the Paragraphs 93 will form the wall film of the sprayed Fuel interrupted again and again. So it becomes very effective the formation of large drops (droplet coagulation) at the outlet of the preparation attachment 61 prevented. Especially with small static spray volumes this avoidance of drop formation is extremely important.
  • the prongs 91 of the drip-off crown 90 are designed vertically, so that their inner wall is axially parallel to Longitudinal valve axis 2 runs.
  • oblique points 91 are the fuel jets by the conical Execution of the opening 79 also diverging conical diverge, at the end of the drip-off crown 90 constricted. This constriction has the consequence that a oblique peaks 91 occurring edge fog largely avoided and the tendency to form drops clearly can be reduced.
  • FIG 3 shows a bottom view of the preparation attachment 61 according to Figure 2. It is particularly clear that the Opening 79 with its tapered Opening sections 79b, 79c, 79d are elliptical in cross section is formed, while the opening portion 79a one largely circular cross-section. Corresponding the cross-sectional shape of the last downstream The opening portion 79d is the drip crown 90 in it basic contour trained.
  • the prongs 91 of the Draining crown 90 are, for example, over the entire Circumferential length of the drip-off crown 90 carried out evenly.
  • the Widths and also the heights of the prongs 91 can, however, also be of different sizes. With the help of the beam splitter 80, the across the opening 79 and for example in Opening section 79b runs, can very well Maintain dual injection valve stay.
  • FIG. 4 shows a second exemplary embodiment of a Processing attachment 61 shown, the one Drainer 90 with vertical, i.e. H. axially extending prongs 91, but neither Beam splitter 80 also paragraphs 93 in the inner opening 79 has.
  • a preparation attachment 61 is suitable therefore only for injectors with which a tapered Beam pattern should be generated, with large static Spraying quantities are used.

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

Claims (7)

  1. Dispositif d'injection d'un mélange carburant/gaz comprenant un injecteur notamment un injecteur de carburant à commande électromagnétique pour une installation d'injection de carburant d'un moteur à combustion interne, ayant un axe longitudinal (2), un organe d'obturation (7), mobile, un organe d'obturation de soupape (16) à l'extrémité aval de l'injecteur, qui comporte une surface formant siège de soupape (29) coopérant avec l'organe d'obturation (7), au moins un orifice d'éjection (25) prévu en aval de la surface formant siège de soupape (29), un orifice d'éjection de mélange (79) pour la sortie du mélange carburant/gaz dans un prolongement de préparation (61) installé à l'extrémité aval de l'injecteur et à l'intérieur duquel il est prévu une ouverture (79) qui s'élargit au moins en partie vers l'aval, cette ouverture étant directement suivie par une couronne d'égouttage (90) ayant un grand nombre de dents (91),
    caractérisé en ce que
    la paroi intérieure des différentes dents (91) de la couronne d'éjection (90) est parallèle à l'axe.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    les dents (91) ont une forme triangulaire.
  3. Dispositif selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce que
    l'ouverture intérieure (79) du prolongement de préparation (61) est formée d'au moins deux segments d'ouverture (79a, 79b, 79c, 79d) qui se suivent axialement et au moins l'un des segments d'ouverture (79b, 79c, 79d) s'élargit dans le sens de l'écoulement et un décrochement (93) est prévu entre au moins deux segments d'ouverture (79a, 79b, 79c, 79d).
  4. Dispositif selon la revendication 3,
    caractérisé en ce qu'
    au moins deux segments d'ouverture (79b, 79c, 79d) de l'ouverture (79) s'élargissent dans le sens de l'écoulement.
  5. Dispositif selon la revendication 4,
    caractérisé en ce qu'
    au moins deux segments d'ouverture (79b, 79c, 79d) ont la même inclinaison de paroi par rapport à l'axe longitudinal (2) de l'injecteur.
  6. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'ouverture (79, 79a, 79b, 79c, 79d) à l'intérieur du prolongement de préparation (61) définit un volume d'éjection (82) traversé par un diviseur de jet dirigé transversalement à l'axe longitudinal (2) de l'injecteur.
  7. Dispositif selon la revendication 6,
    caractérisé en ce que
    le diviseur de jet (80) a au moins une surface de division convexe (85) tournée vers l'orifice d'éjection (25).
EP97116702A 1996-11-26 1997-09-24 Dispositif d'injection d'un mélange combustible/gaz Expired - Lifetime EP0844386B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19648911 1996-11-26
DE19648911A DE19648911A1 (de) 1996-11-26 1996-11-26 Vorrichtung zur Einspritzung eines Brennstoff-Gas-Gemisches

Publications (2)

Publication Number Publication Date
EP0844386A1 EP0844386A1 (fr) 1998-05-27
EP0844386B1 true EP0844386B1 (fr) 2002-12-11

Family

ID=7812792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97116702A Expired - Lifetime EP0844386B1 (fr) 1996-11-26 1997-09-24 Dispositif d'injection d'un mélange combustible/gaz

Country Status (3)

Country Link
EP (1) EP0844386B1 (fr)
DE (2) DE19648911A1 (fr)
ES (1) ES2188840T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003038264A1 (fr) * 2001-10-30 2003-05-08 Alan Patrick Casey Procede et moyens d'injection de combustible

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10130684A1 (de) * 2001-06-26 2003-02-06 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10142299A1 (de) * 2001-08-29 2003-04-17 Bosch Gmbh Robert Brennstoffeinspritzsystem

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4442350A1 (de) * 1993-12-21 1995-06-22 Bosch Gmbh Robert Zerstäubungssieb und Brennstoffeinspritzventil mit einem Zerstäubungssieb
FR2727721A1 (fr) * 1994-12-01 1996-06-07 Magneti Marelli France Injecteur a jupe de dispersion de carburant
DE19505886A1 (de) 1995-02-21 1996-08-22 Bosch Gmbh Robert Vorrichtung zur Einspritzung eines Brennstoff-Gas-Gemisches

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003038264A1 (fr) * 2001-10-30 2003-05-08 Alan Patrick Casey Procede et moyens d'injection de combustible

Also Published As

Publication number Publication date
DE19648911A1 (de) 1998-05-28
DE59708944D1 (de) 2003-01-23
ES2188840T3 (es) 2003-07-01
EP0844386A1 (fr) 1998-05-27

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