US1916062A - Carburetor - Google Patents

Carburetor Download PDF

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Publication number
US1916062A
US1916062A US546286A US54628631A US1916062A US 1916062 A US1916062 A US 1916062A US 546286 A US546286 A US 546286A US 54628631 A US54628631 A US 54628631A US 1916062 A US1916062 A US 1916062A
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United States
Prior art keywords
chamber
suction
air
channel
passage
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
US546286A
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English (en)
Inventor
Memini Giacomo
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Individual
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Individual
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Publication of US1916062A publication Critical patent/US1916062A/en
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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
    • F02M7/02—Carburettors having aerated fuel spray 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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/02—Carburettors having aerated fuel spray nozzles
    • F02M7/025—Fuel cut-off by introducing brake air in the conduit system leading to the main jet

Definitions

  • suction acts differently on the air and on the petrol, on account of their different densities a simple carburetor discharging a jet o petrol from' a reducing or spraying nozzle placed in the center of Lhe column or stream of air, would give an exactly proportioned mixture only when operating at a predetermined speed, but would impoverish the mixture with v a decrease and would too much enrich it with an increase in the openingof the control valve.
  • the present invention consists of a new device by which this aim is attained more satisfactorily than formerly by other methods.
  • the present device is distinguished from others' in several respects including the fact that the fuel flows, through at least one calibrated port or nozzle, from the constant level vessel into a vaporization chamber which communicates, at the upper end, with the discharge opening into the low pressure or most constricted part of the mixer, the aforesaid chamber also communicating with the atmosphere through at least one calibrated channel, and also communicating with at least one suitably placed opening or passage in the body of the mixer where the suction is less than it is at the low pressure point, this last communication being through a passage by ⁇ which the air current, entering the aforesaid chamber from the mixer, cannot reverse its direction, so that from the combined actions of these connections, the suction in the fuel chamber will automatically vary-with variations in the opening of the throttle-at a rate diifering from that at the middle or constricted point of the mixer, thus obtaining an issue of fuel from the discharge in the most suitable roportions for the various loads.
  • Fi 1 is a longitudinal vertical section of 56 a car uretor provided with a device accord- 1n to the invention.
  • igs. 2 and 3 show in longitudinal vertical section another embodiment, Fi 2 showing the condition when working at ow or minimum speed and Fig. 3 the condition during a eriod of increase of engine speed.
  • the mixing pipe or conduit 13 may be as usual, with a venturi section or throat piece 13, the center of which is a zone of maxlmum suction, below the throttle.
  • the petrol (or other liquid fuel) flows, by
  • the small calibrated aperture or orifice 7 (which I'will call the principal or cortrolling orifice or nozzle) the petrol penetrates into the fuel vaporization chamber 8 reaching, when the motor is stopped the same level as in the constant-level vessel 3.
  • tube 12 delivering at 11 into 85 the central zone of the mixer 13 (that is, into the zone of greatest suction) with one or more holes oriented and disposed 4so as to utilize to the lutmost this suction, as, for example,- the upturned or inclined mouth or discharge exit 11 facing in the same direction as the air current;
  • the second channel 10 leading through sundry fine calibrated holes-14 into the chamber 8 and bein sup liedwith air by passage 15 in the wa l of t e mixer near 95 tube 12 and' preferably below or ahead of it;
  • the third channel 20 leading from the atmosphere and through sundry small calibrated holes 21l opening into the chamber 8.
  • the normal level 4 of the petrol stands 100 slightly below that of exit 11 and passage so that the petrol may not escape through these when the engine is idle.
  • the calibrated orifice 7 however is situated somewhat below this level.
  • the air entering chamber 8 is divided between channel and channel 10, these can be so adjusted that, whilst the quantity of air entering chamber 8 through channel 20 increases under an increase of load and therefore of suction, the -current of air' entering through channel 10 automatically decreases, without however being entirely suPPressed or reversed.
  • the level of the petrol in chamber 8 rises until nearly at the same height as in vessel 3; if, at this time, the throttle 1 is opened suddenly, the petrol accumulated in chamber 8 is quickly drawn in by the suction inthe mixer, which, for a moment, becomes still weaker so that it is unable to canse petrol to issue from nozzle 7 in suilicient quantity to form a mixture which would allow the engine to recover speed.
  • the motor is generally made to draw in the necessary petrol by a separate channel 16 opening at 17 in front of the throttle 1, that is, at a point where a strong suction exists on account of the narrowing of the passage, and said channel 16 connecting through a calibrated hole with some point where there is a supply of petrol.
  • the channel 16 connects either with passage 18 at the bottom of chamber 8 or with passage 19 in the extension 6l of this chamber below nozzle 7, or with both of these ⁇ points simultaneously, according to how it may be desired to vary the effect of channel 16 on the rapidity of emptying chamber 8 at the time of recovering speed.
  • the chamber 8 is prolonged at its upper end by a cowl or extension 22 which has a line hole or port 23 at the top.
  • the principal nozzle 7 is, in this case, arranged to deliver into an inner compartment, produced by a wall or tube 24 which is shown as narrowed at 25 and which opens freely near cowl 22.
  • a wall or tube 24 which is shown as narrowed at 25 and which opens freely near cowl 22.
  • At the base ⁇ tube 24 has large holes 26 communicating with chamber 8.
  • the inlet 25 to compartment 24 is in alinement with the atmosphere port 23.
  • the operation of the invention may be described as follows. Whilst running at slowest speeds, there is practically no suction in chamber 8 because there is hardly any Suction in the mixer; the petrol, therefore, risesto the same level as in vessel 3 (Fig. 1). At the moment of opening up the throttle, the petrol which .is in chamber 8 and channels 10 and 20 is quickly vaporized and sucked along tube 9; but, on account of its own inertia, it might be sucked in too late resulting in a mixture too poor in the first instance and .too rich later as the inertia decreases or changes sign; the' acceleration will, therefore, not be gradual. It is here that the device of the present invention intervenes with its regulating action,by the functioning of the air passage 10 as already indicated.
  • a carburetor for an engine comprising in combination with a mixing conduit, a chamber receiving fuel from a constant level vessel through a nozzle, a main air passage leading into said chamber, a vapor passage leading from the upper part of said chamber into the mixing conduit, the chamber having within it a wall enclosing an inner compartment into which the fuel nozzle directly delivers, and the chalnber having an upper extension with an air port leading into it, and
  • the inner compartment having an upper extenslon with an air mlet 1n almement with sald air port; whereby the a1r entering sald port tends to enter said inlet and increase the pressure within the compartment to assist the carburetion of fuel while the engine is being speeded up from idling condition.
  • a constant level vessel feeding into the chamber under restriction, a mixing passage having a zone of maximum suction, a channel conducting air and vapor from the chamber into the mixing passage near the maximum suction zone, a main air channel admitting atmospheric air to the chamber, and a supplemental air channel constantly conducting air from a point in advance of the maximum suction zone in the mixing passage to the chamber at a rate decreasing with increase of flow speed and suction in the mixing passage, whereby to control the suction in the chamber and thereby vary the fuel feed to preserve correct proportions of explosive mixture under variations of running conditions.
  • a carburetor in a carburetor a fuel chamber, a constant level vessel feeding liquid fuel into the chamber under restriction, a mixing passage having a zone of maximum suction, a channel conducting air and vapor from the fuel chamber into the mixing passage near the maximum suction zone, a main air inlet admitting atmospheric air to the fuel chamber, and a supplementalair inlet comprising a channel constantly open located for conducting air from a point in advance of the maximum suction zone in the mixing passage to the fuel chamber at a rate varying in accordance with changes of flow speed and suction in the mixing passage, whereby to control the suction in the chamber and thereby vapor feed therefrom to the mixing passage.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US546286A 1930-06-28 1931-06-23 Carburetor Expired - Lifetime US1916062A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1916062X 1930-06-28

Publications (1)

Publication Number Publication Date
US1916062A true US1916062A (en) 1933-06-27

Family

ID=11434850

Family Applications (1)

Application Number Title Priority Date Filing Date
US546286A Expired - Lifetime US1916062A (en) 1930-06-28 1931-06-23 Carburetor

Country Status (3)

Country Link
US (1) US1916062A (cs)
BE (1) BE380937A (cs)
FR (1) FR704906A (cs)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512085A (en) * 1947-01-27 1950-06-20 Carter Carburetor Corp Carburetor nozzle
US3245666A (en) * 1964-12-14 1966-04-12 Holley Carburetor Co Carburetor main well construction
US3940460A (en) * 1974-02-14 1976-02-24 Graybill Clinton L Air-valve type carburetor
US4150072A (en) * 1976-12-10 1979-04-17 Hitachi, Ltd. Carburetor
US6499726B2 (en) 1999-11-04 2002-12-31 Tecumseh Products Company Engine having carburetor with bridge circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512085A (en) * 1947-01-27 1950-06-20 Carter Carburetor Corp Carburetor nozzle
US3245666A (en) * 1964-12-14 1966-04-12 Holley Carburetor Co Carburetor main well construction
US3940460A (en) * 1974-02-14 1976-02-24 Graybill Clinton L Air-valve type carburetor
US4150072A (en) * 1976-12-10 1979-04-17 Hitachi, Ltd. Carburetor
US6499726B2 (en) 1999-11-04 2002-12-31 Tecumseh Products Company Engine having carburetor with bridge circuit
US6513794B2 (en) 1999-11-04 2003-02-04 Tecumseh Products Company Engine having carburetor with bridge circuit

Also Published As

Publication number Publication date
FR704906A (fr) 1931-05-28
BE380937A (cs)

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