US1347150A - Carbureter - Google Patents

Description

. Patented July 20, 1920.

UNITED STATES PATENT OFFICE.

nimrco FEROLDI, or roam, ITALY.

' Specification of Letters Patent CARBUBETER.

Patented July 20, 1920.

Application filed March 19,1918. Serial 110,223,267.

T 0 all whom it may concern:

Be it known that I, ENRICO Fnnonm, subject ofthe King of Italy, and resident of Turin, Italy, have invented certain new and useful Improvements in Carbureters, of

filled with fuel during the ordinary operation of the carbureter and has-for its object an improved construction of said nozzlel The annexed drawing shows'by way of example a carbureter constructed according to this invention and Figure 1 is a sectional view of the carbureter; Fig. 2 is an enlarged central section of the nozzle and associate partsr As shown in said drawing, the carbureter comprises a carbureting chamber 1 having an extension 18 intended to be connected with the engine suction duct, the communication between said chamber and extension being controlled by a butterfly valve 2 operated by means of a lever 19; on account of engine suction air enters said chamber 1 through openings 20 and 21 and fuel is supplied therein through 'a nozzle 3 as herelnafter described, the same uniting to form the gaseous mixture which is fed to engine.

The nozzle 3 is mounted in a seat 23 provided at the bottom of chamber 1 and 1s clamped therein by means of a hollow bolt 24 having holes 25 in its wall and encircled by a filtering net or the like 26; the chamber or space formed by seat 23 communicates through duct 6 with a tank 7 into which fuel is fed through filtering members 27 and socket 8 adapted to be connected with a feeding pipe.

The supply of fuel to tank 7 may be controlled in the usual manner.

The nozzle comprises a pipe 3 (see Fig. 2) connected with the hollow plug 24, a socket 4 being screwed into mouth of plug 24 to form a restricted passage, and said pipe is provided at its upper end with a head 31 forming a transverse partition 9 in which a restricted orifice 10 is made, the sectional area of this hole 10 being considerably rednced with regard to that of pipe 3; said head is further provided with a small pipe 11 extending into tliespace or chamber 32 of'pip'e 3 between-socket 4 and partition 9.

Above said partition 9, said head 31 is arranged to form a cup 12 communicating with hole 10 and in the wall of this cup are provided rows of holes 13 and 14, holes 13 belng inclined downwardly and holes 14 upwardly as shown in the drawing. There is also formed in said head a hole 14 which leads directly from chamber '32 to a hollow plug 16 located in front of said hole as hereinafter described.

The position of nozzle3 in the carbureter must be so adjusted that the level of fuel in tank 7 and in nozzle 3 connected therewith is maintained at the upper mouth of hole 10 as shown by Fig. 2.

Head 31 is encircled by a bell-15 provided with holes 33 and 34 for the purpose of allowing the suction produced in chamber 1 to 'act in the bell to draw fuel from hole 10 into cup 12 and cause said fuel to issue through holes 13 and 14 as well as for allowing air to enter said bell.

The wall of chamber 1 is provided with a thickened portion 34, in which a longitudinal duct 35 is provided which opens at its bottom into chamber 1 at 36 and communicates with a passage 17 leading to extension 18, the mouth 17 of this duct being located in extension 18 just beyond the edge of valve 2 when this latter is in its closed position as shown in Fig. 1.

In said thickened portion 34' is provided a hole transverse with regard to duct 35 in which is seated the hollow plug 16 having an opening 37 which is of such extent as to communicate both with duct 35 and open ing 36; said plug 16 extends through a hole 38 in hell 15 so as to have its mouth in register with the mouth of hole 14 of head 31.

Said plug 16 is provided with a controlling handle 39 for adjusting the area of communication between the hollow of said plug and duct 35 and a bolt 40 is provided to clamp said plug in the required position, said bolt engaging a flange 41 provided on the plug. 1

The operation of the carbureter is as follows :-lVhen the engine is starting and generally when it must run at a reduced speed, the valve 2 being closed or nearly closed, the engine suction acts through duct 17'1"- 3536 to draw air into chamber 1 and at the same time said suction acts through hole 37 in hollow plug 16 and therefore a depression is created at the mouth of hole 14 which causes the fuel contained in chamber 32 to issue through said hole 14: and enter plug 16 and duct 35 17 this fuel is thus mixed with air passing through said duct and the mixture is fed to the engine through duct 35'1717 and extension 18.

When valve 2 is opened, the suction acts Within chamber 1 and therefore within [bell 15 through holes 34, and thus a depression is created at the mouth of 'hole 10 socket being adapted to be easily replaced,

it being screwed into the mouth of the hollow bolt 24. I 1

Said socket ltogether with partition 9 and hole 10 serves to provide in thebody I porary exceedingly high engine speed, the

of nozzle 3 the aforesaidchamber 32 having a larger sectional area thanv inlet orifice l or exhaust orifice 10, said chamber being filled with fuel so as to render the flow of fuel therethrough even and continuous and obviate variations of flow in case of quick variations in suction acting in ClllIIb" ber 1 and bell 15, these variations being produced for instance when valve 2 is quickly opened or closed.

The above described construction of nozzle which forms the feature of this inven 7 speeds.

tion provides a more satisfactory operation of the carbureter than known constructions of nozzlesand causes the percentage of the mixture to' be constant at different engine In fact when the engine runs to I speed and the fuel issues only'through hole 14" opening in plug 16, the valve 2 being closed as above described, the supply of V j fuel is regular and full, this fuel issuing directly from the chamber'32 of nozzle 3.

Further, during this operation the suction of the engine acts directly on the whole section of chamber 32, so that it insures a satisfactoryfsupply of fuel even whensaid suction is weak as when the engine runs very slowly and particularly in the case of rotatory cylinder engines.

When the engine is running at high'speed and the suction in carbureting chamber is very strong, n ordinary constructions of carbureters andi nozzles, the fuel issues "at high speed from the mouth of the nozzle and then'the' upper portion of the nozzle is apt to become empty, the fuel level being considerably lowered in the same. To overcome this objectionable operation it has -mouth, the shown on the drawingbeing given-merely been proposed either to increase thespeed of the air in the restricted portion of the carbureting chamberencircling the mouth of nozzle in order to increase the suction acting on said month, which results in affecting the output of the engine, or to increase the sectional area of the mouth of said nozzle, this causing a much too large supply of fuel particularly when the engine runs at intermediate speeds I I On the contrary, the arrangement according to this invention avoids theseobjections, and this satisfactory resultdepends upon the, fact that hole 14:, opening vdirectly into chamber 32 causes theengine suction to act 30 in said-chamber and on the whole section thereof, so that. said chamber 32 of the nozzle is always completely filled with fuel,

- without modifying the percentage of the mixture which may be given the required 35 value by suitably adjusting the section" of supply of fuel into cup 12 is alwaysinsured by pipe 11 projecting to a considerabledis o tance into said chamber. r

Qbviously o the described construction of nozzle may be used in carbureters of any kind in which the nozzle has a restricted construction of carbureter" I by way of example as the featureof this invention consists in the construction -of the nozzle.

It has to be understood that thisinvention may also be applied in connectlon with noz zles having different shapes from those shown in the drawing as the same may be -appl1ed to any class of; nozzleshaying a restricted mouth, the subject matter of this invention being limited only as pointed out f in the appended claims.

lVha t 'I claim as my inventionand desire I to secure by U, S. Letters Patent is:

' l. A nozzle for explosion engine carbureters, comprising a tubular member having 1 a transverse partition in the upper part' thereof to divide the tubular member into a an upper section and a 'lower section,said

partition having an orifice to form a pas-V I sage between said sections, said upper section having spraying perforations extending to the outer surface thereof at substantiallythe'same level as a port formed in the I wall of the tubular member andextending from s'aidlower section to the outer surface r of the tubular member? a 2. A nozzle for explosion engine carbureters, eomprising,-a' tubular member, a trans- I verse partition in the upper portion of said tubularmember to form a lower-"chamber and an upper cup, said partition having a restricted orifice therein to form a passage between the chamber and the cup, the cup having a spraying perforation extending to the outer surface thereof at substantially the same level as the orifice of a port formed in the Walls of the tubular member and extending from said chamber to the outer surface of the tubular member.

3. A nozzle for explosion engine carbureters, comprising a tubular member, a transverse partition in the upper portion thereof, to form a lower andupper chamber therein and having a restricted orifice therein, and a pipe connected to said partition extending into the lower chamber and surrounding the orifice to form a passage from said upper chamber to said lower chamber, the Wall of the tubular member being provided with spraying perforations extending from the upper chamber to the outer surface thereof and the Wall of the tubular member having a perforation extending from the lower chamber to the outer surface of the tubular member, the orifices of all of said perforations being at substantially the same level.

Signed at Turin, Italy, this 15 day of October, A. D. 1917.

ENRICO FER-OLDI.

WVitnesses:

MANI DE GIRozIo, GUIsErrE DE LEO.

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