US 2399841 A
Description (OCR text may contain errors)
May 7, 1946. H. c. WARE V AUXILIARY CARBURETOR Filed June 24, 1943 I INVENTOR Patented May 7, 1946 AUXILIARY CARBURETOR Hiram C. Ware, Rochester, Pal, assignor, by. mesne assignments, of one-fourth to Carl H. Scheel,
Application June 24, 1943, Serial Ida-492,017
My invention relates to internal combustion engines, and more particularly to a device for effecting more thorough vaporization of the liquid fuel of the engine, with consequent increase in engine efliciency.
The advantages of thoroughly atomizing or vaporizing gasoline, or other liquid fuel, before it is introduced with air into the cylinders of an internal combustion engine have longbeen recognized, as is evidenced by the years of eflfort spent in the refinement of carburetors. But in the best of the carburetors found on the engines of present day motor cars perfection is not obtained; that is, there is marked tendency for small globules of gasoline to be entrained with the mixture of air and gasoline vapor delivered by the carburetor to the intake manifold and cylinders of the engine. Many devices have been proposed to break down these globules, and I have particularly in mind a device that is adapted to be arranged in the line of flow of the fuel and air mixture from the carburetor to the intake manifold of an engine. The device is provided with a dia- Inthe ensuing specification it will be understood that the device of my invention may be i used with an up-draft carburetor, as well with a buretors may, and ordinarily will, be used.
phragm of fine wire screen that is secured in a position across the passage through which the fuel-air mixture flows. The screen serves to break-up or vaporize the fine globules of liquid fuel entrained with the mixture drawn from the carburetor into the intake manifoldof the engine.
In order to enhance thi desired effect, as well 0 as to obtain a more thorough mixture of the fuel and air, the device also includes one or more orifices, through which jets of air are dmitted to the fuel-air mixture immediately before it passes through the screen. A device of this sort, comprising in effect an auxiliary carburetor, increases the fuel economy of the engine to a notable degree.
I have found that the good results thus obtained may be substantially increased, and my invention consists in improvements or refinements in the structure of such device, whereby the desired increase in fuel economy is gained.
An auxiliary carburetor embodying the invention is illustrated in the accompanying drawing, in which Fig. I is a view of the carburetor in side elevation, with portions of the wall of the carburetor broken away, to reveal internal structure. The air-filter associated with the carburetor, and the intake manifold of the engine, are shown fragmentarily.
Fig. II is a view of the auxiliary carburetor in plan, as seen on the plane IIII of Fig. I.
And Fig. III is a view of the same in section, on the plane III-'-III of Fig. II.
Referring to Fig. I of the drawing, the reference numeral l designates the gasket-like body of my auxiliary carburetor, which in service is assembled between the carburetor 2 and the intake manifold 3 of an internal combustion engine (not shown). The body of the auxiliary carburetor is provided with holes 4, through which screws 5 (Fig. III) may pass, in manifest way to secure the auxiliary carburetor between the flange portions 6 and 1 0f the main carburetor 2 and the intake manifold 3, respectively. The air-inlet 8 of the carbureto 2 is provided with an air-filter 9. The air-filter and main carburetor are in this case conventional in construction. The gasket-like body I of the auxiliary carburetor includes a port I3 that registers with the passage extending through the carburetor drawn through the carburetor and intake manifold 3,. The choke-valve I0 and throttle-valve l I are spaced apart in such passage, the throttlevalve being more remote from the air -inlet than the choke-valve. The carburetor includes means .(not shown but well known to the art) for introducing gasoline vapor to the stream of air drawn through the carburetor and intake manifold into the engine cylinders, and by adjustment of the positions of the two valves [0 and H in usual way, the richness of the fuel-air mixture, and the quantity thereof supplied to the engine, are regulated.
. The minutely perforate diaphragm, through which the fuel-air mixture is passed, comprises one or moredisks I2 of wire screen, typically copper screen of the sort known as mosquito screen.
' The body I of the auxiliary carburetor is recessed,
in Fig. I) entrained in the fuel-air mixture flowing to the intake manifold tend to be broken down and vaporized when the said mixture flows through the minute interstices of the diaphragm. But the vaporization of the globules is not complete, and it is to gain complete vaporization of the gasoline, together with a thorough mixture thereof with the main stream of air flowing through the carburetor 2, that I introduce subsidiary air to the mixture. The subsidiary air is introduced to the fuel-air mixture as in its flow it approaches the perforate diaphragm I2.
The invention consists in the particular means and their organization with the carburetor for effecting in largest measure, not only the complete vaporization of the globules, but a perfect admixture of the vapor with the air.
Such means consist in a plurality of tubes, in this case two tubes I9 and 20, for leading subsidiary streams of air from the air passage of the carburetor 2 (at points on the downstream side of, and adjacent to, the choke-valve I), and reintroducing such streams with substantial velocity head into the passage (on the downstream side of the throttle-valve and upstream side of the diaphragm I2). The tubes I9 and 20 may consist of tubes of extruded rubber or plastic; the tubes are of substantial rigidity, yet pliable enough to permit the bodies of the tubes to be flexed, so that their ends may be telescoped upon the metal adapter tubes I5, I6 and I I, I8 that are threaded or otherwise secured in holes provided therefor in the bodies of the carburetors I and 2.
It is important to note that the adapter tubes I and I6 open into the port or passage I3 of the auxiliary carburetor at points diametrically opposite to one another, whereby streams of air, flowing through the tubes under the effect of the pulsating suction in the intake manifold, produce a condition of violent turbulence immediately above the perforate diaphragm. The 'violent turbulence, thus produced in the air advancing from the throttle-valve to the diaphragm, breaks down the entrained globules of gasoline and effects in conjunction with the perforate diaphragm a uniform mixture of the components of the stream.
The elongate, columnar type of stream that supplies the jets of subsidiary or auxiliary air is not the only feature of importance. Of importance also is the particular location of the inlet ends of the tubes I9 and 20 adjacent to, and on the downstream side of, the choke-Valve, for it is by virtue of this particular feature that the streams of auxiliary air are automatically 'adjusted when the main stream of air isre'gulated. That is to say, when the choke-valve is moved toward closed position to reduce the air flow and to give a richer mixture, as is desired when starting the engine, or when the engine is under abnormal load, the quantity of air entering the tubes I9 and 20 is correspondingly diminished. Thus, when the engine is choked, the desired ratio of fuel to air is not unduly disturbed by the effect of the globule-dissipating jets of auxiliary air.
The structural organization of my invention is particularly adapted for automobiles equipped with the so-called automatic choke. Since the richness of mixture is not unduly unbalanced by any of the normal adjustments of the valves Ill and II, the exhaust valves of the engine are safeguarded from burning. Additionally, the arrangement of the tubes I9 and 20 insures that the auxiliary jets of air are cleansed of dust or other foreign particles; that is, the air by which the jets are fed is air that has passed through the air-filter 9. In fact all of the air entering the two carburetors I and 2 is cleansed by the filter.
The particular combination of the features described affords the good effects sought, and it will be understood that within the terms of the appended claims various modifications are permissible.
I claim as my invention:
1. In an internal combustion engine having an intake manifold, a carburetor having an airinlet equipped with an air-filter, a passage extending through the carburetor from said airinlet to said intake manifold, a choke-valve and a throttle-valve mounted in said passage, said valves being spaced apart in said passage, with the throttle valve more remote from said airinlet than the choke-valve, means included in said carburetor for delivering gasoline in vapor ous form into the column of air drawn through said passage into said intake manifold, and an auxiliary carburetor attachment for by-passing air around said throttle-valve and perfecting the mixture of the delivered gasolinevapor and air, said auxiliary carburetor attachment including a perforate diaphragm positioned across said passage; the combination of means comprising a passageway of relatively small diameter leading outward from said passage at a point adjacent to and on the downstream side of said choke-valve, but on the up-stream side of said gasolinevapor-delivering means, and extending in open communication to said same passage at a point on the downstream side of said throttle-valve and adjacent to said perforate diaphragm, the arrangement of said passageway standing in open communication between said points and being effective automatically to diminish the stream of air flowing therethrough when the choke-valve is moved towards suction-increasing or closed position and to increase the stream when the choke-valve is moved towards suction-decreasing or open position.
2. The structure of claim 1, said auxiliary carburetor attachment including a plurality of said passageways of relatively small diameter and severally extending in open communication between points adjacent to said choke-valve and points adjacent to said throttle-valve as defined in said claim, the air-delivering ends of said passageways being arranged in opposition substantially for the purpose described.
HIRAM C. WARE.