EP0361600B1 - Pulvérisateur corrigé pour le carburateur d'un moteur à carburation - Google Patents

Pulvérisateur corrigé pour le carburateur d'un moteur à carburation Download PDF

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Publication number
EP0361600B1
EP0361600B1 EP89202378A EP89202378A EP0361600B1 EP 0361600 B1 EP0361600 B1 EP 0361600B1 EP 89202378 A EP89202378 A EP 89202378A EP 89202378 A EP89202378 A EP 89202378A EP 0361600 B1 EP0361600 B1 EP 0361600B1
Authority
EP
European Patent Office
Prior art keywords
tube
jet
air
section
nozzle
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
EP89202378A
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German (de)
English (en)
French (fr)
Other versions
EP0361600A3 (en
EP0361600A2 (fr
Inventor
Marco Dr. Ing. Morini
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Individual
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Individual
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Publication date
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Publication of EP0361600A2 publication Critical patent/EP0361600A2/fr
Publication of EP0361600A3 publication Critical patent/EP0361600A3/fr
Application granted granted Critical
Publication of EP0361600B1 publication Critical patent/EP0361600B1/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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/10—Other installations, without moving parts, for influencing fuel/air ratio, e.g. electrical means
    • F02M7/103—Other installations, without moving parts, for influencing fuel/air ratio, e.g. electrical means with self-acting equaliser jets
    • 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
    • F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
    • F02M19/03—Fuel atomising nozzles; Arrangement of emulsifying air conduits
    • 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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/23—Fuel aerating devices

Definitions

  • the present invention relates to a sprayer for the carburetor of an internal combustion carburetion engine, comprising means for the automatic correction of the composition (dosage) of the mixture delivered according to the different operating conditions of the engine.
  • an elementary carburetor comprising a Venturi tube diffuser through which the air sucked in by the engine passes, a gasoline sprayer arranged in the restricted section of the diffuser, a constant level tank supplying gasoline to the sprayer, and a calibrated nozzle (fuel nozzle) arranged between the tank and the sprayer, delivers to the engine a mixture of air and gasoline whose composition is not constant but is enriched when the flow of l the air drawn in by the engine increases.
  • Various devices have been proposed to automatically correct this change in the composition of the mixture delivered.
  • a so-called air brake device which comprises, between the fuel nozzle and the sprayer, a small well in which is immersed a blind tube having perforated walls, which at its upper end communicates with the atmosphere through a second calibrated nozzle (air jet).
  • the sprayer sucks, with the gasoline which passes through the gasoline nozzle, air which is sucked in by the air jet and leaves through the perforations of the tube.
  • This air opposes the passage of petrol through the small well, a resistance which increases when the flow rate increases, so that, at least within certain limits, the desired correction is obtained during operation under stationary conditions.
  • this device has drawbacks.
  • the device mentioned also has a favorable action under transient operating conditions, namely during accelerations, because the tube immersed in the small well has a reserve of gasoline which can be sucked up quite easily, not being braked by the fuel nozzle but only through the perforations in the tube.
  • this effect is not sufficient in practice, so that in most cases it is also necessary to provide an acceleration or recovery pump.
  • the main object of the present invention is to provide a sprayer in which the automatic correction of the composition of the mixture cut must be carried out in a particularly rational and efficient manner, while allowing a very simple structure, any part of which must be easy to access, both for adjustment and for cleaning, particular means being provided to promote as much as possible the mixture between air and petrol and the vaporization of the latter.
  • said first tube comprises an atmospheric air intake provided with an air jet, and it has inside a dividing wall defining a section which communicates with said air jet and which extends downwards into said first tube, and a section (9) which communicates with said flow nozzle (1).
  • said first tube also comprises at its upper end a second atmospheric air intake provided with an air jet, which communicates with said section (9) of the first tube (4).
  • This nozzle presents itself as another element that can be adjusted for adjusting the dosage.
  • Yet another object of the invention is to improve a sprayer as defined above, so as to give it in operation in transient conditions indeed so favorable to make unnecessary the installation of an acceleration pump.
  • the section delimited in the first tube and communicating with the air jet forms a reserve of fuel which can be sucked up without appreciable resistance when the shutter of the diffuser is opened to pass from an operation at minimum speed to normal operation, so that it temporarily enriches the mixture supplied to the engine during the acceleration phase, by replacing the function normally entrusted to a recovery pump.
  • the letter V denotes a tank, closed above by a cover C, in which, by arrangements well known per se and which are neither described nor shown here, a constant level L of gasoline is maintained .
  • the letter D designates a diffuser intended to be connected to the suction manifold of a carburetion engine to be traversed by the aspirated air, flowing in the direction shown by the arrow F.
  • the diffuser D is shaped like a tube of Venturi and it has a restricted section R. In this restricted section R is arranged the flow nozzle 1 of the sprayer.
  • this nozzle is curved by 90 ° and it is connected to a coupling sleeve 2 which passes through a corresponding hole in the wall of the diffuser D to connect to the other parts of the sprayer.
  • this arrangement which is advantageous from the point of view of construction, is not necessary, and the flow nozzle 1 could also be manufactured in one piece with other parts of the sprayer.
  • the sprayer has a first tube 4 which passes through the cover C of the tank V and plunges into the latter.
  • the tube 4 has a lateral connection 5 to which is joined the coupling sleeve 2 of the flow spout 1.
  • the tube 4 carries a calibrated nozzle 13 constituting the fuel nozzle of the sprayer.
  • the vertical tube 4 also extends upwards by a section 6 which opens into the atmosphere and carries at its upper end a calibrated nozzle 14 constituting an air jet.
  • the tube 4 has a connector 7, opposite the connector 5, which opens to the atmosphere and carries a calibrated nozzle 15 constituting an air nozzle.
  • the vertical tube 4 is subdivided inside by a dividing wall 8 which extends over part of its height, dividing the tube 4 into a section 9 communicating with the flow nozzle 1 and with the air jet 14, and a section 10 communicating with the air jet 15.
  • the tube 4 finally carries, on the outside, a pair of flanges 11 and 12. It has been specified that the parts 6, and 14 relate to the particular shape shown, because they are not necessary to achieve the main object of the invention, so it can also be assumed that they are lacking in simplified embodiments. In these simplified forms the tube 4 should be blind in correspondence with the lacking nozzle.
  • the sprayer finally comprises a second tube 16 plunging into the tank V, the upper end of which is joined to the flanges 11 and 12 and communicates with the atmosphere of the tank V, above the filling level L, through openings 17
  • the lower end of the tube 16 is closed by a bottom 18 in which a calibrated hole has been formed 19.
  • the internal diameter of the tube 16 is somewhat larger than the external diameter of the fuel nozzle 13 mounted on the end bottom of tube 4. Between tubes 4 and 16 there is a gap 20.
  • the fuel nozzle 13 of the sprayer (which determines the flow rate of fuel aspirated, as a function of the vacuum existing in the restricted section R of the diffuser D and as a function of the hydraulic load to which it is subjected) no more subject, as in known carburetors, to a constant load corresponding to the level L of filling of the tank V, but to a variable load corresponding to the level M of the petrol in the gap 20, which level decreases with the increased air flow drawn in by the engine.
  • This effect is antagonistic to the tendency of the flowed mixture to get richer when the flow of the aspirated air increases, and therefore, as we includes, an appropriate proportioning of the different parts of the sprayer, and in particular of the fuel nozzle 13 and of the calibrated hole 19, makes it possible to achieve the course considered most suitable for the composition of the mixture delivered, according to the engine speed.
  • the content of the gap 20 also introduces a favorable effect in the operation at a transient regime, be it acceleration or deceleration.
  • the level M in the gap 20 must be reduced from the higher level corresponding to the initial speed of the engine to the reduced level corresponding to the higher final speed, and all the quantity of petrol which corresponds to this level variation is debited to the motor in addition during the acceleration phase.
  • the level M in the gap 20 must rise from the level corresponding to the initial speed of the engine to the higher level corresponding to the reduced final speed, and all the quantity of petrol which corresponds this level variation is subtracted from the motor supply during the deceleration phase. This behavior is favorable both in terms of performance and in terms of economy, and its intensity can be adjusted by appropriately choosing the capacity of the gap 20.
  • the secondary air jet 15 communicating with the section 10 of the tube 4 divided by the wall 8, it is noted that, by the effect of the depression which is established in the tube 4, a certain amount of air is sucked by the nozzle 15, descends in section 10 of the tube 4 and goes back in section 9 with the gasoline, bubbling in the latter and promoting its vaporization. In this way the spout 1 flows into the diffuser D of the gasoline already partly mixed with air and vaporized, to the advantage of the homogeneity of the mixture which finally forms.
  • the presence of the air jet 15 introduces an additional element which can be adjusted to obtain the metering conditions considered most suitable. This effect can also be achieved with an extension relatively reduced towards the bottom of the dividing wall 8. When there is the air jet 14, air is sucked through it too, and this air mixes in the flow nozzle 1 with the mixture already formed by gasoline and air; this introduces yet another element for adjusting the dosage.
  • a significant effect can be obtained by the structure described if the dividing wall 8 extends downwards over a substantial length in the tube 4, say more than half of the extension of the tube.
  • the two sections 9 and 10 of the tube 4 are both filled with petrol up to level L filling the tank V.
  • the engine is accelerated, and the flow of gasoline through the nozzle 1 begins, all the gasoline contained in section 10 is sucked up without encountering any resistance, because it does not must cross no nozzle, hole or restricted section, before the suction of air by the nozzle 15 begins. In this way a significant additional quantity of petrol is positively supplied to the engine during the acceleration phase, making the installation of an acceleration pump superfluous.
  • the importance of this effect can be proportional to the actual needs by appropriately dimensioning the capacity of the section 10 of the tube 4.
  • the delivery to the engine of said additional quantity of petrol is more efficient than the injection of '' an equal amount of gasoline carried out by a usual recovery pump, because this latter injects the fuel under a very reduced pressure, and therefore without it being able to spray and vaporize in an effective way, so that it cannot be used in the best way.
  • the additional quantity of gasoline delivered by the sprayer according to the invention is sucked through the flow nozzle 1 located in the restricted section of the diffuser D, and therefore in the best mixing conditions.
  • the sprayer according to the invention is compact and simple in construction, and all of its parts can be easily accessed for adjustment and for cleaning.
  • the fuel nozzle which it is advantageous to apply to the lower end of the first tube, could nevertheless be applied in any other place of this tube or of the flow nozzle.
  • the bottom of the second tube provided with a calibrated hole, could be replaced by a real nozzle.
  • the first tube with dividing wall which represents a suitable embodiment, could be replaced, with the same function, by a U-tube having a lower opening for the entry of gasoline.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
  • Catching Or Destruction (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP89202378A 1988-09-30 1989-09-21 Pulvérisateur corrigé pour le carburateur d'un moteur à carburation Expired - Lifetime EP0361600B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6787688 1988-09-30
IT67876/88A IT1224458B (it) 1988-09-30 1988-09-30 Spuzzatore corretto per il carburatore di un motore a carburazione

Publications (3)

Publication Number Publication Date
EP0361600A2 EP0361600A2 (fr) 1990-04-04
EP0361600A3 EP0361600A3 (en) 1990-06-20
EP0361600B1 true EP0361600B1 (fr) 1992-07-08

Family

ID=11306007

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89202378A Expired - Lifetime EP0361600B1 (fr) 1988-09-30 1989-09-21 Pulvérisateur corrigé pour le carburateur d'un moteur à carburation

Country Status (6)

Country Link
US (1) US4978479A (es)
EP (1) EP0361600B1 (es)
JP (1) JPH02264144A (es)
DE (1) DE68902031T2 (es)
ES (1) ES2033082T3 (es)
IT (1) IT1224458B (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8697305B2 (en) * 2009-03-16 2014-04-15 Kabushiki Kaisha Toyoda Jidoshokki Fuel cell system

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR485405A (fr) * 1917-05-09 1918-01-09 Marius Jean Baptiste Barbarou Perfectionnements aux carburateurs pour moteurs à explosions
US1562651A (en) * 1918-01-02 1925-11-24 Stromberg Motor Devices Co Carburetor
US1613257A (en) * 1919-10-18 1927-01-04 Packard Motor Car Co Carbureting device
BE356232A (es) * 1928-11-29
US2043514A (en) * 1932-11-25 1936-06-09 Solex Carburetor
US2346711A (en) * 1941-12-15 1944-04-18 Ladimir F Stupecky Carburetor
US3387831A (en) * 1965-10-23 1968-06-11 Acf Ind Inc Carburetor anti-surge device
US3940460A (en) * 1974-02-14 1976-02-24 Graybill Clinton L Air-valve type carburetor
US4001356A (en) * 1975-08-22 1977-01-04 Clinton Graybill Variable venturi downdraft carburetor
JPS5372935A (en) * 1976-12-10 1978-06-28 Hitachi Ltd Carburetor
JPS6027822B2 (ja) * 1977-05-13 1985-07-01 自動車機器技術研究組合 気化器の始動装置
IT1144263B (it) * 1981-07-02 1986-10-29 Marco Morini Carburatore per motori a combustione interna
US4515734A (en) * 1983-01-28 1985-05-07 Rock Howard P Fuel efficient, low pollution carburetor and methods

Also Published As

Publication number Publication date
EP0361600A3 (en) 1990-06-20
IT8867876A0 (it) 1988-09-30
JPH02264144A (ja) 1990-10-26
DE68902031D1 (de) 1992-08-13
DE68902031T2 (de) 1993-02-11
IT1224458B (it) 1990-10-04
US4978479A (en) 1990-12-18
ES2033082T3 (es) 1993-03-01
EP0361600A2 (fr) 1990-04-04

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