US1770428A - Vaporizer for internal-combustion engines - Google Patents

Description

H. B. PETIT July 15, 1930.

VAPORIZER FOR INTERNAL COMBUSTION ENGINES Filed May 23, 1927. 2 Sheets-Sheet l IN VEN TOR.

A TTORNE Y.

July 15, 1930. H. B. PETIT VAPORIZER FOR INTERNAL COMBUSTION ENGINES Filed May 23, 1927 2 Sheets-Sheet 2 I N VEN TOR A TTORNE Y.

MFA/W15. PET/T l 'atentedjuly 15, 1939 I d I i d V i r Unitas STATES PATENT easier;

HENRY B. IPE'II'I, or DETROIT, MICHIGAN, A ssrGNoia 'ro GEORGE M. oLL-nY, F

. DETROIT, MICHIGAN 1 VAPORIZER FOR INTERNAL-COMBUSTION ENGINES V v applicatien filed May 23, 1927; Serial No. 193,499..

This invention relates to that type of va- As the fuel flows against the plate h it'is va- 7 porizer in which the fuel is vaporized with a porized and discharges through j as amore-or small proportion of the total air and is then less completely vaporized fuel entrained with subsequently diluted before being admitted a small quantity of air heated to the same to theinlet manifold. temperature. The casting 0 carries the float 55 The object of this invention is to provide chambencomprising the bowl 179 float g, and convenient means whereby the timing and float mechanism not shown. The casting 0 the quantity of the admission of additional is cast integral with the, cover 71, which forms fuel can be adjusted so as to take place at the Ywith the plate It and exhaust manifold?) the 10 most opportune moment, and in the correct vaporizing passage t which communicates no amount, so that the mixture may be mainwith the vapor outlet tained at its most efficient ratio at all rates of The passage is for the additional fuel is air flow to the engine. 1 T drilled in 0 parallel to the passage f and In the present state of the art there is communicates with the fuel in the float chamconsiderable difficulty in making a device .ber pb'elow-the constant level At its 65 I of the general type indicated above to fit any upper end the passage k terminatesin a re given automobile or motor truck,'and this strictionor nozzle 5 which discharges into V dificultyis especiallyserious whenonly a lima small chamber 4, which communicates ited time can be devoted'to a particular jobv through an opening Z with the passage g.

A good deal of fitting is necessary, and there Thischamber 4 at its outer end is air bled 70 fore a great deal of the selling cost of such or vented through the passage 3 in the plug a device represents the amount of money '2; which communicates with theatmosphere necessary to reimburse the manufacturer for which provides the means for delaying the his experimental work in fitting the device. flow ofthe fuel'up in until a certain minimum By the means disclosed in this invention the depression exists in g. 7

fitting of the vaporizer to satisfy given 0011- In Figure 2 this mixturetlowing through li i HS i m ch imp ifi d jis shown communicating with the mixture Figure 1 shows a cross sectional elevation chamber through the outlet 12, which disof the vaporizer. charges into the throat 6 of the Venturi tube Figure 2 shows the corresponding cross. 7. Aniautom'atic air valve 24 controls the sectional elevation of the mixing chamber to i hi h nte th air entrance 17 and mainwhich the vaporizer supplies the rich imixtains th flow of vapor through 12 at the ture. f lower air speeds. The opening of the air (Note) Figure 1 Sh ws he iIN II iOII propvalve'24 is checked by the stud 25, the length 35 6 igu e 2 s m r y a omp e en ry figof which can be adjusted." V The throttle lever ure. 8 controls thethrottle valve 9, in which is In Figure 1, a is the primary'air tube the airand fuel to the mixture outlet 10. To through Which ail is COIl u d d heated facilitate starting the air entrance is conas it passes through an exhaust manifold b trolled by the choke valve 16 mounted on a 40 to a primary air passage 0 communicating d 18,

with the vertical passage d, in w ch the Referringto Figure 1, the novel features fuel nozzle 6 discharges under the aspirating f thi invention reside generally in the proeflect of the air passing up the passage f, vi i Of: which is a continuation of a? and leads to the An additional fuel nozzle 4 which dis- 45 horizontal passage g. (These passages c, charges the correct amount of fuel into 9 d, f, and g are drilled passages in the casting through which is located above the level 0, which carries the nozzle 6.) The passage y- 2 of the float chamber Z, and specifically g discharges a mixture of air and fuel against in the provision of an exhaust heated plate h, which is the sub- A plug 2wh1ch has an orlfice communiject of Patents No. 1,547 ,47 4 and N0.1,562,670. eating with the atmosphere, the s1ze of which regulates the time at which the fuel nozzle 5 comes into operation by breaking the suction in at until the opportune moment arrives for admitting additional fuel therein.

Operation.When, in the operation of the engine, it is found that on opening the throttie the engine tends to back-fire due to the fuel from 5 coming in too late, an earlier discharge of fuel through Z is obtained by reducing the size of the plug 2. If there is a tendency for the fuel to come in too soon, which fault is indicated by the characteristic bump which then takes place, plug 2 is removed and the orifice 8 enlarged, or 2 is replaced by a plug having a larger vent opening therein. Hence it is possible to make a fitting without varying the air valve 24, and by merely having a number of plugs 2 having various drilled sizes 3 therethrough, which are interchangeable.

In order to give an idea of the relative size of the various passages, if the annulus around the nozzle 6 is equal to a drill, and f is a drilled passage, and the restriction in e is equal to a #59 (.041) drill, then 1. will be a #55 (0.52) drill, 3 a #50 (.07) drill and 5 a #55 drill. Slight variation from these dimensions will enable the fuel from the nozzle 5 to be added to that from 6 without disturbing the smooth operation of the engine to which the vaporizer is fitted.

What I claim is In a vaporizer adapted for use With an internal combustion engine of the type in which a primary heated rich mixture is diluted With cold air, a primary rich mixture passage, a fuel nozzle discharging therein substantially at the level in the float chamber to form the primary rich mixture, a small chamber communicating with said rich mixture passage, a second fuel nozzle discharging into said chamber and thence into said rich mixture passage at a point above the level in the float chamber, a restricted orifice communicating with the said small chamber and with the atmosphere, whereby the depression in the primary rich mixture passage at which this second nozzle commences to feed therein is regulated.

In testimony whereof I afiix my signature.

HENRY B. PETIT.

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