US1381681A - Carbureter - Google Patents

Description

H. C. WAITE.

CARBUHETER.

APPLICATION FILED SEPT. 10. 191".

Patented J unO 14, 1921. I

I i l a ATEN-r orricn.

HARRY C. WAI'IE, OF ELGIN, ILLINOIS, ASSIGNOR TO THERE/It) CARBURETORV (70., OF

GHICAGO, ILLINOIS, A. CORPORATION OF ILLINOIS.

CARBURETER.

Specification of Letters Patent. Patented June 14, 1921.

Application filed September 10, 1917. Serial No. 190,462.

To all whom it may concern:

Be it known that I, HARRY C. VVAITE, a citizen of the United States, residing at Elgin, in the county of Kane and State of Illinois, have invented a new and useful Improvement in Carbureters, of which the following is a specification.

The present invention relates to improvements in carbureters for internal combusnection with the accompanying drawing, in

which-- Figure 1 is a longitudinal central section through a carbureter constructed in accordancewith the invention and Fig. 2 is a fragmentary. section on the line 2-2 of Fig. 1 and showing the auxiliary or starting carbureter and its attachment to the main carbureter.

a The carbureter of the present invention is particularly designed for use with relatively heavy or non-volatile fuels and to that end comprises an auxiliary or starting carbureter-of simple form and intended to handle a relatively vo atile fuel for starting and warming up the internal combustion engine and a main or running 'carbureter for handling a non-volatile fuel and embodying adequate heating devices for insuring vaporiza- I v tion of the non-volatile fuel, the auxiliary carbureter and the mainor running carbureter forming a single structural unit adapted for attachment in the usual manner to the intake manifold of the internal combustion engine.

- Referring more particularly to the drawings, the numeral 10 designates the body casting of the main carburetor, this casting having an open top central chamber 11 which constitutes the mixing chamber of the carburetor and alining air inlet and mixture outlet nipples 12 and 13, the latter being intended for connection to the inlet manifold of the engine. The inlet nipple 12 projects into the mixing chamber 11, the projection being in the form of a elbow 14, the inner end of which is faced to form a valve seat for cooperating with a flapvalve 15 whichvswingsupon a pintle 16 disposedhorizontally in the body casting. One method of securing the flap-valve upon its pintle is illustrated in the drawings, the valve plate being here curved as shown at 17 to embrace the far side of the pintle while a downturned tongue 18 bears upon the near side of thepintle. The valve 15 is normally held to its seat by a leaf-spring 19, one upwardly-curved end of which bears upon the outer face of the valve while the other downwardly-curved end embraces a second horizontal pintle 20. A fiat cover plate 21 which'oloses the open top of the mixing chamberand is secured thereto as by the screws 22, carries an adjustment screw 23 which bears upon the upper face of the leaf-spring 19 adjacent the pintle of the latter. 5

The float chamber of the carbureter designated 24: is spaced some distance below the body casting 10 being connected therewith by atubular heater 25 having inlet and outlet nipples 26, 27, by which the exhaust gases of the internal combustion engine may be led through its bore. A depending boss-carried by the top 28 of the float chamber extends below the normal liquid level therein and is bored to provide an air inlet passage 29 and a fuel outlet passage 30. The chamber connecting these two passages is closed by a double-flanged stud 31 whichalso supports the bowl of the float chamber and carries the fuel nozzle 32. This nozzle member )rojects into the fuel passage 30 forming t erewith an atomizing device for spraying the liquid fuel. A thin walled tube 33 connects the bore 30 with the body casting 10 passing centrally through the heater 25 and terminating at approximately the level of the lower end of the flap-valve 15 within the mixing chamber. The air inlet passage 29 is connected with the air inlet nipple 12 of the body casting by a similar thin walled tube 34. Outside of the point of connection with the tube. 34, the nipple 12 may be provided with a butterfly-strangle valve 36 for construction and requiring no particular dea. v scription, Since theauxiliary carbureter is intended only for starting and initially warming the engine, it may be of very small I size and of the simple form illustrated.

' In the operation of my improved carbureting apparatus the float well 40 of the auxiliary carbureter is supplied with relatively volatile fuel, such as gasolene, while the float well 24 of-the main carbureter is supplied with relatively non-volatile fuel, such as kerosene. To start the internal combustion engine to which the carbureting apparatus is connected, the throttle valve 4L3 of the auxiliary carbui'eter is broughtto the full openposition, any necessary controlling effect being obtained through the main throttle valve 37, the volatile fuel in the auxiliarycarbureter is readily vaporized carbureting the air passing therethrough and supplying this mixture to the mixing chamber 11 and thence to the connected internal combustion engine for starting the same and running without load or with very light load .tube 33. spring 19 and the weight of the valve 15 will be such that the latter will open to a small.

until the engine becomesheated up. Meanwhile, the jet 32 of the main carbureter will have been exposed to suction and a certain small quantity of the non-volatile fuel will have been drawn upwardly with the air passing through the heater tube 33. Owing to the thin walled construction of the tubes 33, 34, they-will become heated to a relatively high temperature 'almost immediately after the engine is started and upon becoming heated will cause the vaporization of the heavy fuel carried in suspension in the ascending current of air. As this vaporization becomes more complete, the mixture supplied to the engine will become 'richer and within a short interval of time it is possible to close the throttle 'valve 43 of the auxiliary carburetor, the engine thereafter operating upon the mixture of vaporized heavy fuel supplied by the main carbureter.

Under the suction of the engine the auxiliary or diluting air valve 15 will be drawn open against the resistance'of the leaf-spring 19 to admit governed quantities of diluting air to the relatively rich mixture delivered into the mixing chamber from the heater In general, the tension of the extent even when the carbureter is supplying the minimum quantity of the mixture,

- it being found desirable to proportion the carbureter parts so that under practically all conditions the mixture delivered into the mixing chamber from theheater tube 33 shall be over-rich, that is, shall contain a larger percentage of fuel than is required ing in effeect therefore an oil-vaporizing tube through which a small quantity of air sweeps for thepurpose of carrying along the vaporized oil. In general, it will be preferable to preheat the air entering the main carbureting air inlet nipple 12, this preheating to be accomplished by connection of the nipple to a carbureter air heater of any common form. Under these operating conditions, therefore, the entire mass of air ad-' mitted to the carbureter is heated in the usual manner, and in addition a small proportion of this preheated .air is utilized for aspirating and atomizing the fuel from the nozzle 32, and sweeping the atomized'fuel through the heating tube 33 and into the mixing chamber 11, where it meets the main stream of preheated air. The strangle valve 36 may be employed in the customary way to temporarily increase the vacuum within the carbureter and provide a richer mixture to facilitate starting and warming up.

The normal or running adjustments of the carbureter, are effected through the screw 23 which regulates the tension of the leafspring 19, thereby proportionately regulating the opening of the diluting air valve 15. By the spring arrangement shown, it is quite possible to provide a full range of adjustment under a movement of one revolution 'or less of the screw, 23, one extreme of this adjustment tensioning the leaf-spring 19 to such an extent as to hold the valve 15 closed under the highest operating suction, while the other extreme of the adjustment will per- .the carbureter upon the removal of the cover-plate 21. Each of these members has 180 or less bearing upon its pintle and may, therefore, be removed and replaced without disturbing any other parts of the mechanism. It is further to be noted that the nozzle 32 may readily be cleaned by the removal of the cover-plate 21 and spring 19, under which conditions it is possible to introduce a cleaning wire or needle through the' heating tube 33 and thence into and through the bore of the nozzle to remove any obstructions therein.

While I have shown and described in considerable detail one specific embodiment of my invention, it is to be understood that this is illustrative only and for the purpose of makingthe invention more clear and that I plied by the heating tube 33, the latter be do not regard the invention as limited to these details nor to any of them, except in so far as such limitations are included within the terms of the accompanying claims in which it is my intention to claim all of the novelty inherent in my invention as broadly as is permissible in view of the prior art.

What I claim is V 1. In a carbureter, a heater adapted to receive the exhaust gases of an internal combustion en ine, a casing connected with said heater and aving a mixing chamber therein,

a main air passage leading to said chamber, a valve between the main air passage and mixing chamber, a fuel inlet, a shunt air passage anterior to the valve and leading from said main air assage and terminating in an enlarged cham er surrounding the fuel inlet, and a passa e leading from said lastreferred to'cham er through the heating chamber and terminating in the mixing chamber posterior to the valve separating same from the main air inlet, whereby the fuel is heated in the presence of a small proportion of air and then mixed with a larger proportion of air at atmospheric tempera-' ture.

2. In a'carbureter, a heater adapted to receive the exhaust gases of an internal combustlon englne, a casing connected w1th sald heater and having a mlxlng chamber thereln,

a main air passage leading to said chamber,- a valve between the mean air passage and mixing chamber, a fuel inlet, a shunt air passage of relative restricted area to the main air passage and opening from the lower wall thereof anterior to the valve and leading from said main air passage and terminating in an enlarged chamber surrounding thefuel inlet, and a assage leading from said last-referred to c amber throu h a larger proportion of air at atmospheric temperature.

HARRY o. WAITE.

Images