EP0520169A1 - Fuel spray nozzle - Google Patents

Fuel spray nozzle Download PDF

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Publication number
EP0520169A1
EP0520169A1 EP92107766A EP92107766A EP0520169A1 EP 0520169 A1 EP0520169 A1 EP 0520169A1 EP 92107766 A EP92107766 A EP 92107766A EP 92107766 A EP92107766 A EP 92107766A EP 0520169 A1 EP0520169 A1 EP 0520169A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
fuel
outlet holes
outlet
baffle plate
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.)
Granted
Application number
EP92107766A
Other languages
German (de)
French (fr)
Other versions
EP0520169B1 (en
Inventor
Josef Dipl.-Ing. Kreutmair (Fh)
Nikolaus Dipl.-Ing. König (FH)
Robert Gaudermann
David-Michael Simpkin
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.)
MAN Truck and Bus SE
Original Assignee
MAN Nutzfahrzeuge AG
MAN Technologie AG
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 MAN Nutzfahrzeuge AG, MAN Technologie AG filed Critical MAN Nutzfahrzeuge AG
Publication of EP0520169A1 publication Critical patent/EP0520169A1/en
Application granted granted Critical
Publication of EP0520169B1 publication Critical patent/EP0520169B1/en
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
    • F02M67/00—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type
    • F02M67/10—Injectors peculiar thereto, e.g. valve less type
    • 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 fuel atomizer nozzle with a nozzle body which encloses a mixing space and has a plurality of outlet holes for a fuel / air mixture.
  • Nozzles of this type usually consist of a hollow cylindrical nozzle body, on one end of which the inlet lines for the atomizing air and the fuel are connected, and the other end of which is designed as a baffle plate and has about 5 outlet holes which are evenly distributed in a circle symmetry.
  • the amount of fuel to be delivered through the nozzle is regulated according to the engine map of an internal combustion engine.
  • the invention has for its object to develop an atomizer nozzle of the type mentioned, in which a uniform distribution of the fuel / air mixture emerging from the nozzle is ensured in every operating phase.
  • the fuel / air mixture is accelerated by the intermediate nozzle such that the fuel reaches the baffle plate with relatively high kinetic energy even at low mass flows and is pulled apart uniformly there.
  • the influence of gravity on the fuel is almost eliminated.
  • the fuel / air mixture reaches the outlet holes in an evenly distributed manner and thus enables a uniform outlet from the atomizer nozzle.
  • the nozzle opening arranged approximately centrally in the partition, which acts as an intermediate nozzle, preferably has a cross section that is equal to the sum of the cross sections of the outlet holes.
  • the measure according to the invention makes it possible to cover a substantially larger control range with a multi-hole atomizer nozzle than was previously possible, specifically because the control range for small amounts of fuel in the nozzle according to the invention offers no problems with atomization and distribution.
  • the nozzle 10 consists of a hollow cylindrical nozzle body 11 which encloses an interior 12 which is connected to the supply line 14 for fuel 15 and atomizing air 16.
  • the fuel 15 is mixed or atomized with the atomizing compressed air 16 in the line 14 and in the expansion space 12 and pressed to an intermediate nozzle 17, which is located in a partition 20 dividing the expansion space 12 into two spaces 18 and 19. Due to the intermediate nozzle 17, the fuel / air mixture 21 is accelerated onto the outlet end face 22 of the nozzle 10 which acts as a baffle plate and is thereby pulled apart radially.
  • the radial division of the jet 21 takes place uniformly in a circular shape, ie the effect of gravity on the fuel in the vicinity of the outlet end 22 of the nozzle 10 is negligible. In this way, even small amounts of fuel can be distributed uniformly over the outlet holes 23, which are located in the outlet end face 22 of the nozzle 10.
  • the partition 20 is preferably funnel-shaped on both sides.
  • a nozzle opening 17 is selected with a cross section which is equal to the sum of the cross sections of the outlet holes 23. On the one hand, this does not interfere with the control behavior and, on the other hand, ensures a uniform discharge of the atomized fuel from the outlet holes 23, even with very small amounts of fuel.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

An intermediate nozzle (17) is proposed for a multiple hole fuel atomising nozzle (10), by means of which the atomised fuel (21) is thrown at high velocity against the outlet-side end wall (22) of the nozzle (10) serving as baffle plate and uniformly diffused radially on the baffle plate and emerges through the outlet holes (23) of the nozzle (10) just as uniformly distributed. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Brennstoff-Zerstäuberdüse mit einem Düsenkörper, der einen Mischraum einschließt und mehrere Austrittslöcher für ein Brennstoff/Luftgemisch aufweist.The invention relates to a fuel atomizer nozzle with a nozzle body which encloses a mixing space and has a plurality of outlet holes for a fuel / air mixture.

Düsen dieser Art bestehen in der Regel aus einem hohlzylindrischen Düsenkörper, an dessen einer Stirnseite die Eintrittsleitungen für die Zerstäuberluft und den Brennstoff angeschlossen sind und dessen andere Stirnseite als Prallplatte ausgebildet ist und etwa 5 Austrittslöcher hat, die kreissymmetrisch gleichmäßig verteilt sind. Die durch die Düse zu fördernde Kraftstoffmenge wird entsprechend dem Motorkennfeld eines Verbrennungsmotors geregelt.Nozzles of this type usually consist of a hollow cylindrical nozzle body, on one end of which the inlet lines for the atomizing air and the fuel are connected, and the other end of which is designed as a baffle plate and has about 5 outlet holes which are evenly distributed in a circle symmetry. The amount of fuel to be delivered through the nozzle is regulated according to the engine map of an internal combustion engine.

Es hat sich herausgestellt, daß bei geringem Kraftstoffdurchsatz eine ungleichmäßige Verteilung aus den Austrittslöchern erfolgt. Bei liegender Anordnung der Zerstäuberdüse erfolgt eine stärkere Ablagerung von Kraftstoff im unteren Bereich des Düsenraumes, was bis zur "Verstopfung" der unteren Austrittslöcher führen kann.It has been found that with a low fuel throughput there is an uneven distribution from the outlet holes. If the atomizing nozzle is arranged horizontally, there is a greater deposition of fuel in the lower region of the nozzle space, which can lead to the "clogging" of the lower outlet holes.

Der Erfindung liegt die Aufgabe zugrunde, eine Zerstäuberdüse der eingangs genannten Art zu entwickeln, bei der eine gleichmäßige Verteilung des aus der Düse austretenden Kraftstoff/Luftgemisches in jeder Betriebsphase gewährleistet ist.The invention has for its object to develop an atomizer nozzle of the type mentioned, in which a uniform distribution of the fuel / air mixture emerging from the nozzle is ensured in every operating phase.

Die Aufgabe wird mit den Merkmalen des Anspruches 1 gelöst.The object is achieved with the features of claim 1.

Durch die Zwischendüse wird das Kraftstoff/Luftgemisch derart beschleunigt, daß der Kraftstoff auch bei geringen Massenströmen mit relativ hoher kinetischer Energie auf die Prallplatte gelangt und dort gleichmäßig auseinandergezogen wird. Durch die Anhebung der Geschwindigkeit wird der Einfluß der Schwerkraft auf den Kraftstoff nahezu ausgeschaltet. Das Kraftstoff/Luftgemisch gelangt auf diese Weise gleichmäßig verteilt zu den Austrittslöchern und es wird somit ein gleichmäßiger Austritt aus der Zerstäuberdüse ermöglicht.The fuel / air mixture is accelerated by the intermediate nozzle such that the fuel reaches the baffle plate with relatively high kinetic energy even at low mass flows and is pulled apart uniformly there. By increasing the speed, the influence of gravity on the fuel is almost eliminated. In this way, the fuel / air mixture reaches the outlet holes in an evenly distributed manner and thus enables a uniform outlet from the atomizer nozzle.

Die in der Trennwand etwa zentrisch angeordnete Düsenöffnung, die als Zwischendüse wirkt, hat vorzugsweise einen Querschnitt, der gleich der Summe der Querschnitte der Austrittslöcher ist.The nozzle opening arranged approximately centrally in the partition, which acts as an intermediate nozzle, preferably has a cross section that is equal to the sum of the cross sections of the outlet holes.

Durch die erfindungsgemäße Maßnahme ist es möglich, mit einer Mehrloch-Zerstäuberdüse einen wesentlich größeren Regelbereich zu bestreiten, als es bisher möglich war, und zwar weil der Regelbereich für geringe Kraftstoffmenge bei der erfindungsgemäßen Düse keine Probleme bei der Zerstäubung und Verteilung bietet.The measure according to the invention makes it possible to cover a substantially larger control range with a multi-hole atomizer nozzle than was previously possible, specifically because the control range for small amounts of fuel in the nozzle according to the invention offers no problems with atomization and distribution.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt.

Fig. 1
zeigt einen Längsschnitt einer Mehrloch-Zerstäuberdüse 10 und
Fig. 2
eine Draufsicht auf die austrittsseitige Stirnseite der Düse 10.
In the drawing, an embodiment of the invention is shown schematically.
Fig. 1
shows a longitudinal section of a multi-hole atomizer nozzle 10 and
Fig. 2
a plan view of the outlet end face of the nozzle 10.

Die Düse 10 besteht aus einem hohlzylindrischen Düsenkörper 11, der einen Innenraum 12 umschließt, der mit der Zufuhrleitung 14 für Brennstoff 15 und Zerstäuberluft 16 in Verbindung steht. Der Brennstoff 15 wird mit der Zerstäuberdruckluft 16 in der Leitung 14 und im Expansionsraum 12 vermischt bzw. zerstäubt und zu einer Zwischendüse 17 gedrückt, die sich in einer den Expansionsraum 12 in zwei Räume 18 und 19 teilenden Trennwand 20 befindet. Aufgrund der Zwischendüse 17 wird die Kraftstoff/Luftmischung 21 beschleunigt auf die als Prallplatte wirkende Austrittsstirnseite 22 der Düse 10 geführt und dabei radial auseinandergezogen wird.The nozzle 10 consists of a hollow cylindrical nozzle body 11 which encloses an interior 12 which is connected to the supply line 14 for fuel 15 and atomizing air 16. The fuel 15 is mixed or atomized with the atomizing compressed air 16 in the line 14 and in the expansion space 12 and pressed to an intermediate nozzle 17, which is located in a partition 20 dividing the expansion space 12 into two spaces 18 and 19. Due to the intermediate nozzle 17, the fuel / air mixture 21 is accelerated onto the outlet end face 22 of the nozzle 10 which acts as a baffle plate and is thereby pulled apart radially.

Aufgrund der hohen kinetischen Energie des Stromes 21 erfolgt die radiale Aufteilung des Strahles 21 gleichmäßig in Kreisform, d. h. eine Einwirkung der Schwerkraft auf den Brennstoff in der Umgebung des Austrittsendes 22 der Düse 10 ist vernachlässigbar. Auf diese Weise lassen sich auch geringe Kraftstoffmengen gleichmäßig auf die Austrittslöcher 23 verteilen, die sich in der Austrittsstirnseite 22 der Düse 10 befinden.Because of the high kinetic energy of the stream 21, the radial division of the jet 21 takes place uniformly in a circular shape, ie the effect of gravity on the fuel in the vicinity of the outlet end 22 of the nozzle 10 is negligible. In this way, even small amounts of fuel can be distributed uniformly over the outlet holes 23, which are located in the outlet end face 22 of the nozzle 10.

Die Trennwand 20 ist vorzugsweise beidseitig trichterförmig ausgebildet. Um einen gleichmäßigen Fluß des zerstäubten Brennstoffes innerhalb der Düse 20 zu gewährleisten und andererseits die Wirkung der Düsenöffnung 17 in allen Regelbereichen zufrieden zu stellen, wird eine Düsenöffnung 17 mit einem Querschnitt gewählt, der gleich der Summe der Querschnitte der Austrittslöcher 23 ist. Damit wird einerseits das Regelverhalten nicht gestört und andererseits ein gleichmäßiger Austritt des zerstäubten Kraftstoffes aus den Austrittslöchern 23 gewährleistet, auch bei sehr geringen Kraftstoffmengen.The partition 20 is preferably funnel-shaped on both sides. In order to ensure a uniform flow of the atomized fuel within the nozzle 20 and on the other hand to satisfy the effect of the nozzle opening 17 in all control ranges, a nozzle opening 17 is selected with a cross section which is equal to the sum of the cross sections of the outlet holes 23. On the one hand, this does not interfere with the control behavior and, on the other hand, ensures a uniform discharge of the atomized fuel from the outlet holes 23, even with very small amounts of fuel.

Claims (3)

Brennstoff-Zerstäuberdüse mit einem Düsenkörper (11), der einen Mischraum (12) einschließt und mehrere Austrittslöcher (23) aufweist, dadurch gekennzeichnet, daß im Mischraum (12) eine Trennwand (20) mit einer Zwischendüse (17) vorgesehen ist, die den Mischraum in zwei Räume (18 und 19) aufteilt.Fuel atomizer nozzle with a nozzle body (11), which includes a mixing space (12) and has a plurality of outlet holes (23), characterized in that a partition (20) with an intermediate nozzle (17) is provided in the mixing space (12) Mixing room divided into two rooms (18 and 19). Düse nach Anspruch 1, dadurch gekennzeichnet, daß die Trennwand (20) ein-oder beidseitig trichterförmig ausgebildet ist.Nozzle according to claim 1, characterized in that the partition (20) is funnel-shaped on one or both sides. Düse nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Querschnitt der Zwischendüse (17) etwa so groß ist wie die Summe der Querschnitte der Austrittslöcher (23) der Zerstäuberdüse (10).Nozzle according to claim 1 or 2, characterized in that the cross section of the intermediate nozzle (17) is approximately as large as the sum of the cross sections of the outlet holes (23) of the atomizing nozzle (10).
EP92107766A 1991-06-28 1992-05-08 Fuel spray nozzle Expired - Lifetime EP0520169B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4121346A DE4121346A1 (en) 1991-06-28 1991-06-28 FUEL SPRAYER NOZZLE
DE4121346 1991-06-28

Publications (2)

Publication Number Publication Date
EP0520169A1 true EP0520169A1 (en) 1992-12-30
EP0520169B1 EP0520169B1 (en) 1995-07-26

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ID=6434934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92107766A Expired - Lifetime EP0520169B1 (en) 1991-06-28 1992-05-08 Fuel spray nozzle

Country Status (3)

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EP (1) EP0520169B1 (en)
AT (1) ATE125596T1 (en)
DE (2) DE4121346A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE229404C (en) *
DE416921C (en) * 1921-01-22 1925-08-03 J & C G Bolinders Mek Verkst S Fuel injection device, especially for internal combustion engines
DE419233C (en) * 1923-09-14 1925-09-22 Naamlooze Venootschap Hollands Atomizer nozzle for atomizing liquids, in particular fuels
US2623786A (en) * 1948-10-01 1952-12-30 Rudolf L Wille Method for atomizing fuel and nozzle for carrying out this method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE229404C (en) *
DE416921C (en) * 1921-01-22 1925-08-03 J & C G Bolinders Mek Verkst S Fuel injection device, especially for internal combustion engines
DE419233C (en) * 1923-09-14 1925-09-22 Naamlooze Venootschap Hollands Atomizer nozzle for atomizing liquids, in particular fuels
US2623786A (en) * 1948-10-01 1952-12-30 Rudolf L Wille Method for atomizing fuel and nozzle for carrying out this method

Also Published As

Publication number Publication date
DE59203017D1 (en) 1995-08-31
EP0520169B1 (en) 1995-07-26
ATE125596T1 (en) 1995-08-15
DE4121346A1 (en) 1993-01-07

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