US1314056A - Apparatus - Google Patents

Description

1. GOOD.

FUEL CHARGE SUPPLY APPARATUS APPLICATION FILED MAY 23. m1.

Patented Aug. 26, 1919.

Fig.1,

I Original application filed June 1,1916, Serial No. 101,017. Divided and this application filed May 23, 191 'Berial No.

' To all whom it may concern:

formity ofthe supply TE e as PATENT OFFICE.

JOHN (3001), OF BROOKLYN; NEW YORK, ASSIGNOB T GOOD INVENTIONS 00., OF

I l BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK FUEL-CHABGEbUPiPLY APPARATUS.

Be it known that I, Jonn Gooma citizen of the United States, residing in Brook- 1 11, New York, N. Y., have invented the ollowing described Improvements in Fuel- (Jharge-Supply Apparatus.

My invention is concerned with the uniand the character "of the combustible mixture of liquid fuel [and air supplied to internal combustion engines, particularly automobile and marine engines, and consists essentially in constituting a portion of the length of the suc- -tion intake between the engine and the lo charge-formmg device or carburetor, as a Venturr-tube, so that the entire mixture charge must pass through such tube after "its measurement in the carburetor, whereby "the vaporization of the mixture and its homogeneity are greatly improved, with corresponding improvement in the engine citi- '-c1eucy, and whereby also the liquid fuel to form the mixture may be brought from a storagetank at a lower level to a local service tank at a higher level, from which it may flow by gravity and under substantiallyconstant head to the carbureting spray nozzle thereby assuring constant conditions tor the formation of the mixture.

The improvement in the combustibihty of the charge mixture results from the combination of the two conditions of high velocity and shrimp pressure reduction occurring at the thuoat of the Venturi-tub'e :u'companital also by the deposition of the liquid spray on the wall of the tube as it passes through, and the consequent film-vaporizing action that occurs in such passage. It is necessary for this pur-' pose that substantially the entire charge, in the form of a previously formed spray, enter the convergent entrance of the Venturi-tube. In the accomplishment of the uniformity of i a liquid supply, the invention consists in the combination of the same Venturi-tuhe with a local service tank having suitable automatic pression existing at the throat of the venturi is caused to supplement the normal relative vacuum in the suction intake and create vigorous liquid flow to said local tank from the main supply at a lowenlevel under all Specification of Letters Patent.

Patented Aug. 26, 1919.

and suitable pipe connections to the suction intake and the main supply tank and, under the control of the float valve, operates intermittently to allow the vacuum in the suction intake to draw the liquid fuel from the main tank into the upper chamber of the local tank from whence it flows into the lower chamber and thence to the carburetor spray nozzle. In such apparatus, as now and heretofore used, vacuum conditions normally existing in the suction intake depend principally upon the position of theengine thrott e which controls the flow therethrou h, a closed throttle crcatin a very consic erable relative vacuum. hen the throttle is full open, or nearly full open, however, the relative vacuum in the suction operation and such reduced suction frequently coincides with working conditions requiring the maximum fuel sup )ly, that is to say, maxiimun fuel isneedeci when the throttle is wide open, so that the fuel isthus apt to fail when most needed. Thisobjection is not apparent in automobiles where the throttle is seldom full-open and never full open for very long periods, and where the capacity of the local tank is made large enough to accommodate the maximum expected full open operation, but in marine engines where a wide 0 ma throttleis the normal position the suit apparatus cannot be practically used for obvious reasons", and even with liberal tank capacity are uncertain of operation for automobiles under certain conditions, such for example as when the loaded engine with wide open throttle is ascending a very long hill. By the present invention the minimum degree of relative vacuum available to lift thefuel is always tle is wide openor not and the increased vacuum is obtained not only without iinposing any appreciable restriction to the flow; of the charge m xture to the engine but ac-j ter results than heretofore. 1

In the accompanying drawings I have shown such a service tank as above referred" 'to and as shown' in the said patent of Webb Jay combined with a Venturi tube constituting'part of the suction intake manifold of an engine in accordance with my invention. Figure 1 being the general organization, and Fig. being a modified form.

The engine illustrated in outline may be assumed to be an ordinary automobile engine having a suction intake manifold 1 connected with a carburetor :2 of any desired or suitable type by means ,of a Venturi tube 3. This tube comprises a relatively abruptly convergent entrance section 4 and a longer divergent recovery portion 5 the widest diameter of each section being equal to the general diameter of the suction intake passageas a whole. The taper of both 'sections is determined according to the known principles of Venturi tube construction, with reference 'to the normal flow through the engii'ie intake and to produce a local region of sharp- .prcssure reduction at its throat or narrowest point without :however producing (any appreciable obstruction to flow by reason of the narrow diameter at the throat, and that being the characteristic of 'V'ent uji-tubes as distinguished from other iconstrictcd passages. The local reduction otpressure at the throat is accompanied by corresponding local increase of the flow velocity and these two coincident conditions are conducive to rapid and complete vaporization of the liquid fuel in the air and thorough mixing ,ot the vapor therewith. It is to be noted that the inixtiu'epf the liquid fuel and airis formed by and witnm valve nozzle 6 for that'purpose, so .that a previpmsly formed spray'mixturc enters the Venturi tube-and is directed againstthe com Vergent \vall surfilces of the entrance sec-, t ion4. 'l he-suspcndcd liquid thereby forms -a iilm on the said surfaces subject to; the

friction o'lthe gaseous How and in consc-t quence becomes more completely and he nmgencously vaporized. The cnti ecngine iharg'c thus passed th'roi gh -the' 'Venturi tubc aaml the vacuum an: riiinggat the throat serves -'not "only o "'lacilitate ,\'aporization but-,also tiroperatc the liquid simply apparatus :as above stated... Such s-vacuum depends uponfthe l'vclocity oi the in automobile service with the same or betthe carlulreter 2 which has the usual spray v flowthrough the Venturi, but the flow with wide open throttle and the engine under load is ample to give an adequate vacuum effect to lift the fuel. to even greater eleva- -tions than normally required, this being due trolling factor of the suction acting to lift the fuel. i

The liquid receptacle of the carbureter 2 is kept at a constant level in Fig. 1 by means of the usual float controlled valve as indicated, and receives its liquid through a pipe 7 from the local service tank 8 mounted at a higher level. This tank in turn receives its supply of liquid fuel through the pipe 9 from a main storage tank 1t) which is to be understood as the tank commonly attached to the rear of the autom't-ibile at about the level of the rear axle, and hen 'r-below the level both of the local tank 8 as well as below the carbureter. The construction and mode of operation of theglocal tank shown is the same as that shown and described for example in the patent above referred to and and detailed explanation thereof. Briefly the said tank includes an upper and a lower chamber for the liquid fuel and the upper chamber is in constant. communication with the storage tank through the supply line 9 and is adapted to discharge, its liquid into the lower chamber through atlapsvalve outlet 24. Suitably-guided inthe imperchamher there is a float 19 connected to and ,op-- crating a lever 20, and through a link 21 this lever operates a 'second lever 22 to which a spring or springs 23 is connected and the other end of the spring lSCUll-m nected to a short lever 18, the arrangement of the two levers being so related to their common fulcrum that as the float rises and falls the spring is carried past the axis of the fulcrum thereby resulting in a snap movement of the short lever 18. The latter ver 18 operates two valves; one of them, iota" :trols the communication between the upper chamber and the suction pipe 11 and the other 17, controls a commu ication between the upper chamber-and he vent to atmosphere, 15. The suction pipe '11 leads to the throat or point of narrowest constriction of the Venturi tube 3 above deto which reference may be had for a further scribed and is therefore subject 'to the local prcssure depression always existing at that c point. The i'allmg ot' the float 19, which results from the discharge of the liquid therein into the lower chamber, simu-l- -.tanc(')usl v closes the an vent 17 and opens comnmnication through the pipe 11 withthe Vcntur: tube "and thereby the relative vacuum iotthc latter is extended into the upper chamber causingimmedia'te flow" of liquid fuel to that chamber-a ainst gravity from the storage tank 10. This flow continues until the floatlt) shifts the sprin 23 past the fulcrum of levers 22 and 18 w iereupon the suction valve 16 is closed and the air vent valve 17 isopened.therebypermitting the "liquid just drawn into the upper chamber to flow by gravity into the lower chamber and presently reaching a condition where the movement of the float valve takes place in accordance with the withdrawalof fuel from thelower chamber to the carburetor, that is to say, in accordance with the demands of the engine. The lower chambe will be observed-also to be in communication with atmospherethrough the vent 15.

'lhe'throttle 12 is interposed between the Venturi tube and the carbureter so that the whole charge as formed in the latter is admitted to the Venturi tube according to the throttle adjustment.

Any type of carburetor may be used, and

' in Fig. 2 l have shown a modified form of the same t )e shown in Fi 1 but wherein "the liquid level of the receptacle is kept at a surrounding compartment 31, flows back to the tank by the return pipe 32. By this arrangement a continual circulation of the liquid fuel is established, while the engine is in operation, and the fuel in themain storage tank is thereby kept in motion, which has the effect of keeping it of a constant quality and specific gravity throughout, by

' preventing gravitational separation or stratitication of the components. When lubrieating oil is added to the fuel, this circulation has the effect of maintaining a homogeneous mixture therein withthe fuel.

parent that, the invention provides for tie general improvement of the means for-supplying the specification.

combustible to internal combustion' engines and it remains to point out that it applies equally to all kinds of fuel, as will be evident; Whenusin fuels heavier than gasolene, heat is applie to the fuel within the Venturi tube to thereby supplement its natural vaporizing action, the heat being taken from the water-jacket of theengine or its exhaust gases, according to prior art methods and the character of 1 such heat may be applied to the exterior of the'tube or to the air entering the same, or

both, as preferred.

This a plication' is a division of m pending application Serial No. 10101;, filed June 1, 1916.

I claim:

1. The combination with an internal com bastion engine, of r'neansfor supplying-com- 'bustible thereto comprising a lo -a1 service tank, a charge-forming device supplied thereby, a Venturi tube interposed between ml used, and

and connecting said deyice with the engine,

and a suction pipe connected t( the throat of said Venturi tube and adapted to communicate the suction eflect therein-to said tank to fill the same with fuel. 2. The eombinat' n with an internal combustion engine, of n ans for supplying combustible mixture thereto, comprising a charg-i-forming device, a Venturi-tube constitutin r part of the length of the suction intake between said device and the engine,

"a throttle intervening between said device and Venturi tube, a local Service tank' to suppl said device, and a suction pipe C0? necte with the throat of the Venturi tube adapted to extend the suction effect in said ifntake to said local tank to fill the same with uel.

3. In an.ihterna l combustion engine the combination of a pipe. or passage connected to the engine and includin a section of its length constituted by a enturi tube, a throttle placed in advance of and controlling the flow to said tube, a local service tank, and a suction pipe connected to the throat of the Venturi tube and adapted to communicate the suction efi'ect thereof to said local tank to fill the same with fuel h against gravity. From the foregoing it will thusbe a In testimony whereof, I have signed this JOHN GOOD.

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