US1791623A - Carburetor - Google Patents

Description

FeE. 10, 1931. u c ms 'N 1,791,623

CARBURETOR Filed'l-eb. 2a, 1927 2 Sheets-Shah's 1 I N VEN TOR.

ATTORNEYS.

Feb. 10, 1931. J. HUTCHINSON 1,1 3

' CA-RBURETOR Filed Feb. 28, 1927 '2 ShootS-Sheet 2 INVENTOR. 55 506 JM/liddnwow ao'nfiu'rcnrnson, F nigma; Yank if ECA BU TOR I p i p p p ucatibn med Fehr'uaryfiti, iwgxsgrin 5 7' l This invention relates to carburetors as as ibst'antiallyconstant level of liqlfi'dused in'conjmiction withinternalc'omhustion 1s maintained? i enginesutilizing "liquid fuel, 'and is'an im In the present case afloat ehainbe'rhousprovernent over myco-pending application ing, designated b'y'the ni'lmera'l'lO, contains fil'ed'October 27; 1925," Serial N 6. 6 5,073. a float chamber 11 over which isacover-IZ 5'5 Ithas been' foundthatif suflicielit heat is and in the bottom, atthe'ce'nter, is'a recessed 7 applied at the proper placeand the fuel'spray plug 13. Q i Q is spread against-such hotsurfaces, the fuel 'Set in the cover 12 isa :11 elbow 14'by' v vh ich can be vaporized before commingling with COIlIlQCtlQH lS niadew'ith asupply of fuel, the

the iair flowing through the usual Venturi sameentering a reduced passagelileading' ou tube;andyby'reason' of; having the heat con to a recess '16 open tp' the flootchamber 11,-

centrated-"at'this point, a substantially-dry the passa ge' --beipgcontio11ed by a --Iiee dle gaseous mixture is obtained vvithout the 'ap-' valve 17:. i I I plication of heat to'theearbureted mixture The stern 18 0f' tl1e*n'eedle valve passes afterfle vin the carburetor. through and is adjustably fixed in afloat 19 .05

j The herein described method endmeans to be guided in the recess ofthe plug' l3, the prevent overheating thecharge, which overfloat; having a'hub 20adjustedon the'sten 1'8 heating would seriously aflect theefliciency by a nut, and is loosely'guided in the recess of the-engine. '16 of the inlet elbovvga vent21 is provided 9 [It i-s'therefore an objectofthepresent in in the elbow, allowing the passage ofai'ri to 70 vention t0 providemeansivvhereloy an 'essenthe float chamber 11. f tially dry mixture is obtained by applying i At one side-o *the housing 10; is an extensuificient-heat directly-to the spray or meassion having a recess 23 in open coinlnunicaured portion of fuel, changing it intoa vapor tion with r the float chamber 11, ?th1s :recess V and passing the vapor through a plurality being sealed by aflangedplug 24in itsbottoin. 75 .c

c of'small radial perforationsorjslits'ilito the I Above the reoess23 is a bore 25 intovvhich constricted portion" of a Ventu'ri tube to be extends ahollovv scr'evv 26, 0pen-to'the recess mixed thoroughly from allfside's with the air and having a valve seat 27 at -its' .inner end pa'ssing'through-the tube. i controlledby avfineneedle'valve 28 provided 7 "1'30 Further'fifeatures are to provide ana ito- -Witl1 "a n adjusting means 29 at its outer 'end, so

I matic air controldeviceoperative in the :venwhich extends through agla'ndBO, set in the V turi, to surround the venturihy fa heated upper end oftfheextension 22.

' chamberyand to more convenientlyjre'locate It'i's to be'noted that'the hOre'Q S'presBnts float chamber.

. materialpartiofthej'isclosurmfandin-ivhieh: aAnm tegmr-pre 5 a '-enturitubeshowing a-inodi'ficationfreni Y t that indicated-in Fig.i;-

r1150 imme the other a fioetchafiiber the-liquidtfuel control with respect to the an annularspa' ce around the main 1n'1'1er porj I I tionoftlie screw 26,'in which isaminut 'e aperp These advantageousfeatures areattained ture2l5 j and leadingrfromthelovver portion g by-the'novel design,construction-andcomb} iofi-th is space-is afine' passagefglinope'n' co nnatioii of parts hereinafter described "ancl ','munication'vvitlrthelatmosphere at thetop'of shownrjin the annexed drawings forming a th'e'extension. i

afi i e s new f j imi gge32'tofbeseciiitedtoas a r h qdy w mixin phamhe Fig. 1 is a vertical sectional "viewftaken through an embodiment -0' f the invention; i 2is a top plan View of "the same. fia n -he up er end'e 'In common gtheusuel 'typeiofcarbine? b tors the device'e'onsists"oftwo main parts, ii- "Themixi" one a m'ix-in'g'. chamber f'att'ached to 1 th h hollow "ann 1 The annulus 35 is provided flange 39 by whichattachment. is made to the engine. 7

with a pan of V spaced tubular. extensionseOjand 41 connect ing respectively with the exhaust of the engine and muffler, the arrangement being such that the hot, spent gases are circuitously through the'annulus and del ver to it a very considerable proportion oi their heat;

At the end of the annulus 3 5, oppositefthe, flanged extension, is iLiSQfLlTdQ provided with a packing ring 43, and secured-on the seat is a'fiang'e 44: formed on the extending portion of a right angled Venturitube 45. l is I a The straight main portion 46 of the venturi is close fitted to the bore 38, it's divergent conical delivery endreaching past the inner wall of the annulus into the extension 37 and its restricted portion being; disposed; substantially central'of the annulus. 4 f r 1 I At the restricted portion oftherventuri is a circumferential groove 47, a. si1nilar but lesser groove 4&beingiorrned Einits body in register with the passage 36 to receive liquid fuel entering therethrough The outer portion of the; venturi, adjacent the sin ers also fitted closely to the bore, but between the groovese'i and l8 the body is reduced to form a thin channel 49 in which is a helical reove l9afth rough. :WhiClLtlie liquid fuel passes in a fihn becoming heated by the inneiywalllof the annulus and from the gI'OOVQQ LT passes through a plurality of smallradial openings 50 into the restrictedportion ofthe ventu ri.

c In-the e xtension l'v is a c butterfly throttle valve5l fixed onla stem 52, one end of which 7 extends beyond its bearings and is provided 7 with acrank handle 53, thus controlling the mixture as delivered to theengine. g l

I At the opposite, angl d endof the venturi is a similarbutterfly valve 54,fixed on a stem 55, controlled by a crank handle 56, tlills cOntrolling the choke or air inlet tothe venturi. Formed in the Yenturi bodyjelbow ffl, at the axis of its mainportion-is an elongated hub 58 having an internal screw thread to I receiveian adjustablehollow screw59 provided with aninr'eaching hollow stem 60; Freely slidable intlie screw and stem is a thin, light rod 6lifixed at itsinner end in a hollow conical valve'member 62,- having'a closed frcuate forward end containing-a ce'n i 1 tralfaperture ,63, this l nember'being preferof aluminum or other lightv material and 7 so. disposed; within the venturi to cause the sprays of liquid fuel, .entering in a "heated conditionthrough the passages 50, to impinge uponlt becoming spread, and thoroughly ctheventuri ll M F a mixed with theinfluxl air e rie thrq i to Ithefgro ove 4L7,

which may be held in. adjustment by a set caused to travel screw 64. I r q In the, modification shown in Fig. 3 the by primed numerals,except that grooves 47 and 48'," of rectangular crosssection are used a helical channel; is cut -1n-; .the circum- -.ference, resembling n effect and appearance,

a shallow square threadof coarsepitcln the same causing the liquid fuel to travel circuitouslyfrom one groove to the other and becom oi the'venturigi I The ;operation of the floatichalnber will be clearly understood byfall familiarwith the art, although attention istin vited to' the space surrounding'the hollow screw 26 and the fine venturi is the same as previously described "and given the same. numerals, distinguished in adr as at itselner ence nto theinterior c more ,i H

vent 31, whichj is foundin practice to mate: V

r ially ass st in equalizing fluctuating de mands on the .chamberll; 1

As the liquid fuels drawn into theventuri in-the form of a highlyiattenuated stream, it ec m s rap ly v.0 atii i d y P g-i rect contactwith the heated inner surfa'ceof; the annulus 3 5, eventually entering as ad'ry gas, readilymixed with at nosphericairfpassing throngh' the venturi which is controlled in -allrespects. in-'the usual manner; a U

Distribution of the entering air is however accomplished 'fwithin the venturi in a; manner believcdto be; novel by a floating valve- memher 62,50 arranged as-to maintainapentral positionu'elgative to the wall ofthc venturi, 1

irrespective ofjits longitudinal movement, o as causedby an inrushin'gvolume of'air and restricting the opening tlierethroughr jEheforegoingdisclosure is to beprega'rded 02EfVVhlCll ;Ql)Nl0llSly' an embodiment may' be constructed 1nclud1ng many ,inodificatlon's without I dep arti-n from the general scope asdescriptiveand illustrative only, and not w as restrict ve iorvlnmtatn e of the invention,

herein indicated and;denoted-in-the apbended s laying thus described my inventiongfwhat I claim, as new anddesiretosecureby Letters Patent, r f T 1-. Incombination: with" carburetor, "a

float cliamber'having'za'fioat controlled valve,

said-v cIh-amber containinga-klateral' recess, a tubulan member gd-ISPQSBCl 1H2 the :re'cess open at its bottom to liquid ginthe chamber and Y extending; to-apoint substantially :nniform with-the;l-iquid level-in the chamber, there, I

beingjanl; annular: aspace r surrounding: said membe mamially{operable needleswa-lve I and the other rounding the venturi f ed by a restricted passage and 7 2o with the atmosphereat a point above said chamber. 2. In a carburetor having a fuel supply means, a venturi and an air intake, said vencircumferential grooves, one at its restricted portion in communication with the interior;

atthe inlet of fuel, the body of said venturi being reduced in diameter between the grooves, a hollow annulus surbody, and means for heating'said annulus. j

3. A carburetor comprising a Venturi tube having a cylindrical outer surface containing two spaced circumferential grooves connectprovided with a series of small orifices connecting one of the grooi 'es-jwiththe interior of the venturi, a fuel inlet leading to the other of said grooves, and means for heating the fuel in its 'passage'between the grooves. 4. A carburetor comprising a constant level fuel supply means,

7 turi havingtwo spaced fuel grooves connectjacent the venturi to ed by an'attenuated' passage, one of the. grooves being in communication with the interior of the venturi, a series of spaced pararea intermediate the first and last groove, and the other with the fuel inlet, and a heating chamber circumenclose the grooves.

5, In combination with a carburetor, a float chamber having an inlet at the top, a float actuated valve controlling said inlet, means to adjust saidvalve relative to the float, a vent in said chamber adjacently below said valve, an upright tubular member in open 1 communication with the float chamber at its bottom, a needle valve controlling the outlet of said member, said valve being manually adj ustable exteriorly the carburetor above the plane thereof, a vent in said member open 1 to the atmosphere, said vent being in a plane parallel and remote from saidfmember, and

a connecting flange on 'saidcarburetor con-a taining a lateral discharge passage.

6. A carburetor for internal. combustion motors comprlsing a constant level fuel supply source, an air inlet, a venturi, a light fweight hoHow conioal'floating valvein said venturi beyond .its restricted portion, said valve containingv a chamber open to thespace in which it floats, means to adjust said valve,

an air intake, a ven- V a Chamber Oren tothe space in wliichit floats; Y

means to adjust the closingmovement of said e 1 valve,'a chamber surroundmg SfiLlCl venturna' hollow annulus clrcumjac ent the chamber for passing hot gases from'themotor around said chamber, and annular grooves in the body of said venturi for passing a film of. 't'uri body having a series ofspaced parallel fuel interjacent said venturi and said chamber prior to entering the venturi. r i In testimony whereof have hereunto a chamber surrounding ,said venturi, and a hollow annulus enveloping saidchamber} through which exhaustpass forsupplying heat to said chamber.

7. A? carburetor for internal combustion" motors comprising a constant level fuel sup-V ,ply source, conical floating valve in said venturi beyond its; restricted 7 portion, said valve conta ning an air inlet, a venturi, a hollow

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