Gas and liquid contact apparatus – Fluid distribution – Valved
Reexamination Certificate
2000-03-07
2001-10-09
Chiesa, Richard L. (Department: 1724)
Gas and liquid contact apparatus
Fluid distribution
Valved
C261SDIG002, C261SDIG003
Reexamination Certificate
active
06299144
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to carburetors and, more particularly, to carburetors having additional apertures positioned adjacent to an internal orifice that delivers an air-fuel flow mixture to an internal combustion engine.
2. Background of the Prior Art
A carburetor is the primary component for supplying an air-fuel mixture to an internal combustion engine. The function of carburetors is to combine or mix fuel with an air flow created by the vacuum pressure generated from the pistons of the internal combustion engine. The advantage of using a carburetor is that a relatively simple and inexpensive device can supply an air-fuel mixture capable of satisfying a relatively wide range of power demands and acceleration modes.
A disadvantage of prior art carburetors is the depositing of liquid fuel upon the side walls of a well portion of the carburetor. The liquid fuel deposits can occur due to a myriad of causes including temperature differentials, friction and pressure changes. The liquid fuel deposits, due to gravity, eventually accumulate in a bottom portion of the well around a needle element inserted into an orifice that supplies the air-fuel mixture. The needle element is connected to a speed control throttle that controls air flow in the carburetor. Speed control throttles include movable slide valves and butterfly valves. The accumulated liquid fuel does not effect the performance of the internal combustion engine so long as maximum air-fuel flow rates are not demanded by the control throttle. However, should a richer air-fuel flow rate be required quickly during acceleration when a liquid fuel accumulation or “puddle” is present, during cruise mode for example, the internal combustion engine's performance will decrease and unburnt hydrocarbons discharged to atmosphere will increase. The reduced engine performance and increased emissions are the result of large liquid fuel portions or “droplets” being lifted relatively slowly from the puddle by the quick increase to a maximum air-fuel flow rate and dumped, still in liquid droplet form, into the piston cylinder.
Many carburetor designs and systems are available, (see U.S. Pat. Nos. 5,827,335; 5,716,555; 4,399,079 and 4,016,845). None provide a device that is capable of causing the liquid fuel puddle surrounding the needle element to mix with a flowing air-fuel stream when a control throttle requires a fast increase to a maximum air-fuel flow rate thereby decreasing hydrocarbon emissions and increasing engine response.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a carburetor device that overcomes many of the disadvantages of the prior art.
A principle object of the present invention is to provide a carburetor device that mixes accumulated liquid fuel in a well portion of the device with a flowing air-fuel stream. A feature of the device is a plurality of apertures positioned adjacent to an orifice that connects the well portion to a cavity in the device. An advantage of the device is reduced unburnt hydrocarbons emissions and increased response and power from an internal combustion engine.
Still another object of the present invention is to prevent the accumulated liquid fuel from flowing down the plurality of apertures into the cavity of the device. A feature of the device is the relatively small cross-sectional area of each of the apertures. An advantage of the device is that the accumulated liquid fuel remains in the well until a maximum air-fuel flow rate and a corresponding increase in engine power are required.
Yet another object of the present invention is to prevent air-fuel flow through the plurality of apertures when liquid fuel has accumulated in a bottom portion of the well of the device. A feature of the device is the relative close positioning of the plurality of apertures in relation to the orifice connecting the well portion to the cavity in the device. An advantage of the device is that the accumulated liquid fuel does not evaporate or “mist” until a maximum air-fuel flow rate and a corresponding increase in engine power are required.
Briefly, the invention provides an improved carburetor device for an internal combustion engine, said improvement comprising a plurality of apertures circumferentially disposed in relation to an orifice joining an inner mixing cavity to an outer well member, the orifice having an air flow control member inserted therein, said apertures extending from the inner mixing cavity to the outer well member; means for preventing liquid fuel from draining into said apertures; means for urging air flow through said apertures; and means for engaging said liquid fuel with said air flow through said apertures thereby vaporizing said liquid fuel and correspondingly increasing power output and decreasing unburned hydrocarbon emissions from the internal combustion engine.
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Cherskov & Flaynik
Chiesa Richard L.
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