US1418499A - Carburetor - Google Patents

Description

F. G. WAS'HBURN.

CARBURETOR.

APPLICATION FILED IuLY 24,19I9.

Immune. 6,1922.

IN V EN TOR.'

BY f) ,7(` `RIvEYs.

ATT

"its Vduct 18 of larger diameter than the duct 19 of the upper section. The lower nozzle f section 16 terminates at its upper end ad# jacent the lower end of theinember 6 and. at this point the nozzle wall is tapered 1nzfwardly andvupwardly as indicatedatalf p ,n "the tapered nozzlefportion a are discharge 'orifices 2O which are directed aslant upvwardly and outwardly. y The upper end of the nozzle section `17 is provided withav dis.-

-charge orifice`21. The nozzle section- 17' extends entirely through the member 6 and s yprojects well into the-member l so that someV ofthe perforations' 5 are lbelowthe level of the orifice 21, and other of the perorations are abovethelevel of the orifice 21. Be*

' 9, it is Vclear that, when suction lis *producedv inthe memberthe" velocityof the air ad- 20.

cause of the contracted throat of the passage yjacent-the nozzleforitice 20 will-be higher than the velocity-of the air vadjacent the nozi vzle orifice 21.

`hastened tothe upper end of the body-1 'by{caprscrewsv 22, or the like, is an elbow 23 forming the outlet member of the carburetor. This outlet member`23v is adapted to be connected to-the intake manifold of` an internal combustion engine, not shown. vThe lower end of the outlet member 23 seats upon the Vupper end of themember '4 so as to hold said member firmly on the'seat 2.

l the 'float chamber 25 of the carburetor, thusl They body 1 is connected by an arm 24: to

leaving the passage 9 unobstructed 'exceptf ing for the fuel supply tube'll and nozzlek 16, 17. rlhe outer end' portion of the? fuel Ysupply pipev 14, forms Va T26- which nts against the fbottom 27 of the -Hoat chamber, `and "a cap screw'28 extends through the ver-`v4 tical bore 29 of the'T, the cap screw 28 bejing'screw-threaded at 30 into an opening 31 inthev bottom 27 oi the-iioatchamber.y The i cap' screw 28 is provided with 'an '1 -shaped vduct 32 which communicates at its lower end with the bore of the' tube 14C and at its lupper' end -fwith KVthe interior'v of the lioat jcham- The float chamber 25 maybe provided 'with any suitable-mechanism for maintain* Ving the' liquid"l fuel therein vat a predetei`w mined level so that the 'level of the fuel will Y remain' 'constant in'fthe nozzle whenV` the en- `l`gine 1s n'ot in operation. rlhe fuel; levellin 'the nozzle will preferably be ljust bel'ow'the '7" le'vel'of the nozzle oriices 20.

axis 311 fivhichmay be turned by any prel'n,actual"'operation, the engine, not shown,

I t'o"wl`iich the outlet member 23 is connected,

-' "onbeing started into 'operation in the usual,

manner' ereate's* suction in ythefair passage 9 so as to cause air to How through said passage. In starting the engine into operation the throttle valve will be but slightly opened and the suction produced in the body 1 above the air valve 'll will not be sufficient to raise said valve. The velocity of the airv through theaii passage 9 becomes a maximum adjai cent the vdischarge yorifice 2O and theftuel will discharge irom said orifices into 1 the column of air flowing through thelair pas-- sage 9., but the fuel will not discharge *from the oritiee2l. l

'5 lllhenhigher speed or powerl o'l' the engine is desired, the throttle valve 83 will be opened -to a greater' degree and theensuing increased-degree of suction produced in the body1 above the valve 11 raisessaid .valve so: Aas to open theportslO, thus allowing :aux- -iliary air to'flow into the body 1, thence through the perforations '5 inwardly and"upwardly around the tipi of the'noz'zle; v

lllhen the increased suction takes place adjacent the nozzle the vfuel-'level raised su'tliciently in lsaid lnozzle, to cause discharge oi' some of the fuel through the nozzle orifice l21, and this additional' fuelalsomixes with the column of air owingfthrough" thefair passage9 and this mixture is'v diluted bythe 'auxiliary 'airad-mitted through the'perforai tions.

Thus it is clear that under higherengine ,speeds orV greater loads on the'englne, the 'higher nozzle oriiicey 21 as well as the lower "orifice 20 vsprays fuel intolthe airl lpassageY 9'?? ,When-'the throttle valve is but partly open and the air' valve' is closed, the'4 velocity vof the v air current being h-igheradj acentthe orifice '29A causes the fuel Vto flow 'freelyfromfthe orii'ice 20 so as to produce a'I richmij'gturegf* l li/vhen, however, the-valve 11"opens",some of the engine suction becomes available to draw air into the carburetor throughjthe auxiliary .air ports 10, andconsequently 'the velocity of air passing through thesm'allerlportion ,of the air passage 9 does not increase proportionately to the increased demands of the engine@y owever,rv thoughthevelocity ofi the air may notz increase proportionately adj acentvthe orifices 20, said orifi'ceswillcon-" ,vt-inne to discharge fuel, and/the vsomewhat increased degree' of' vacuum lproduced.v a*

cent the nozzley 21 ywill: cause* discharge" of fuel 'from lthe ;oriiice"21'. .KQ lt isto vbenoted'that allot the'air ad-'"1 'Jmitted to the' carburetor' passes l' freely lupwardly and that the air :passagek 9'isfree and unobstructed throughout 'its' length excepting tor the tube 141 and nozzle'16`,1,1`7. The widerthe throttle is'opened the higher the"U valve 'llwill be raised so'aslto increasethe lvdegree of opening of the auxiliary air .ports 10, which results. inl a freer flow` of aininto *the carburetor so that ythejmixture'"will not 4be'coine too' rich "at" higher engine speeds,

the` suction adjacent the fn'oz'zle being lneutralized .to some degree by the admission of Y member into the `inverted frusta-conical 'f the auxiliary air, as the suction increases.

It is'understood that such changes and modifications may be madein the invention as lie withinthe spirit and scope of the appended claim, and that the invention includes such changes and modifications.

I claim: v I v ,i ln a carburetor, in c m1bination7 a tubular body, an inverted hollow frusto-conica-l member inside of the body provided at intervals therearoundwith auxiliary airV inlet perforations and otherwise closing the upper end of the tubularv body, a tubular mem-l 'ber joinedl to fthe lower end of the rusto-`v conical member, a hollow rustoconioal member joined to the lower end of 'Said 'tubular member and closing the lower end of the hollow body and having its lower end open, and a nozzle in thefrusto-conioal memberl projecting through fthe tubular member and comprising lower and-upper Sections, the lower section having a-ductv of larger diameter than .the duct'of the upper section and there being an orifice` inthe n nozzle communicating with the larger duct adjacent the lower end of the. tubular inemy,

ber andjtherel beingan orifice in the ynozzle 4 3 0 u upper end` ofthe n'ozzle,there being` ports communicating withithe smaller duct at the in the tubularfbody and space for thepassage of air romthe'ports ,to the inlet perforations.,

Signed at Los ngeles; California);

18th day of July,`l919. y l

GEORGEH. Hiring; p L. BELLEEAvER.

'B5 i. 'y

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