Unidirectional fuel nozzle for improving fuel atomization in a carburetor or similar device

Abstract

The present invention relates generally to devices and methods for improving fuel atomization in a carburetor or similar device. More specifically, the present invention provides a unidirectional fuel nozzle designed to improve the atomization of fuel injected into a fuel-air mixing chamber of a combustion engine. The fuel nozzle comprises a number of perforations through one half of a cylindrical body of the nozzle and a number of dimples disposed on an outer surface of the other half of the cylindrical body. Each of the perforations connects the inner and outer surfaces of the cylindrical body and terminates at the outer surface in an air turbulator defined by a hemispherical cavity. Similarly, each of the dimples is designed with an air turbulator, but does not protrude over the entire inner surface. These air turbulators respond to air pressure to create turbulence on the surface of the fuel nozzle, thereby delaying the separation of the air from the surface of the fuel nozzle and, as a result, facilitating the breakup of the fuel droplets. In effect, this increases the atomization of the fuel that mixes with the air, thereby improving the fuel combustion efficiency of the engine. Higher fuel combustion efficiency is further achieved by unidirectional high velocity injection of fuel through the perforations towards the combustion engine.

Description

Detailed Description of the Invention

[0001] (Technical Field) The present invention generally relates to systems and methods for improving fuel atomization in carburetors or similar devices. More particularly, the present invention relates to a unidirectional fuel nozzle designed to improve the atomization of fuel injected into the fuel-air mixing chamber of a combustion engine.

[0002] (Background Art) Conventional main fuel nozzles found in carburetors for small to medium displacement engines have only one outlet through which liquid gasoline is injected into the fuel-air mixing chamber. Carburetors for motorcycles or older model automobiles do not directly control the flow of liquid fuel, but the carburetor controls the flow of air entering the engine. The speed and pressure of that flow will determine how much fuel is mixed with the air flow. Low air speeds result in a lack of pressure drop, particularly in the areas around the main fuel nozzle and the jet needle (for motorcycles), making fuel delivery inefficient and inadequate. Furthermore, low-speed fuel injection cannot fully atomize the fuel, leading to a phenomenon of insufficient fuel volume.

[0003] As can be seen in the prior art, systems exist for improving the emulsification of air-fuel mixtures for more efficient fuel combustion. WO1997 / 037120A1 discloses a fuel nozzle having an upstream orifice and a plurality of downstream orifices, wherein the surface area of ​​the upstream orifice is smaller than the surface area of ​​the downstream orifices to restrict fuel from being drawn out only through the downstream orifices. WO1997 / 037120A1 further describes an orifice having a configuration in which the area changes from the surface inward, presumably to improve the performance of the fuel nozzle with respect to the tendency of the nozzle to discharge fuel. US2003 / 0160341A1 provides a method for improving fuel emulsion by passing the air-fuel mixture over a threaded or other notched surface, or over a ridge, protrusion, cavity or dimple, before the mixture is taken into the venturi portion of the carburetor. These dimples and equivalents can be located in any passage or emulsified fuel / air delivery system through which both air and fuel are delivered to the combustion chamber. In some cases, this may be due to obstructions within the main delivery pipe or main nozzle.

[0004] While both WO1997 / 037120A1 and US2003 / 0160341A1 generally disclose dimples or orifices with an area that changes inward from the surface to improve the tendency of a fuel emulsion or fuel discharge nozzle, the prior art does not specifically disclose a fuel nozzle designed with a combination of dimples and through-holes arranged circumferentially on one half of the nozzle body, along with an outer hemispherical cavity, on the other half of the nozzle body. This design greatly improves the atomization and penetration of fuel droplets toward the combustion chamber. Thus, it can result in significant fuel savings for, for example, motorcycle riders and also benefit the environment due to the reduced amount of carbon dioxide injected.

[0005] (Summary of the invention) An object of the present invention is to provide a method for improving fuel atomization and penetration in a combustion engine. A further object of the present invention is to provide a fuel nozzle designed to improve the atomization of fuel injected into the fuel-air mixture chamber of a combustion engine. The fuel nozzle comprises a plurality of perforations passing through one half of the cylindrical body of the nozzle and a plurality of dimples disposed on the outer surface of the other half. Each of the perforations extends across the entire inner and outer surfaces of the cylindrical body and terminates on the outer surface with an air turbulator defined by a hemispherical cavity. Each of the dimples, on the other hand, is also designed in conjunction with an air turbulator, defined as a hemispherical cavity only on the outer surface and does not protrude through the inner surface. These air turbulators generate air vortices on the outer surface of the nozzle as air enters the air-fuel mixture chamber of the vaporizer and flows through each of the turbulators. As a result, this facilitates further disruption of fuel droplets injected in the direction toward the combustion chamber through the perforations, thereby improving fuel atomization in the combustion engine.

[0006] The design, which has a perforation on one half of the fuel nozzle, results in even higher fuel combustion efficiency because the fuel is injected through the perforation towards the combustion engine in a unidirectional, downstream, and high-speed manner.

[0007] (Brief explanation of the drawing) The accompanying drawings are included to provide a further understanding of the present invention and are incorporated herein to illustrate embodiments of the invention. Along with the description, the drawings also serve to illustrate the principles of the present invention.

[0008] Figures 1A and 1B show perspective views of a fuel nozzle according to a preferred embodiment of the present invention.

[0009] Figures 1C, 1D, and 1E show cross-sectional views of a fuel nozzle according to a preferred embodiment of the present invention.

[0010] (Modes for carrying out the invention) Atomization is the process of breaking down fuel oil particles into extremely small droplets. This makes it easier to burn the fuel in the combustion chamber. The better the droplets are broken down, the better the atomization. The quality of the atomized fuel particles further contributes to improving the quality of combustion by contributing to the penetration process. Penetration is the distance that fuel particles travel within the combustion chamber just before combustion. The smaller the fuel particles in the atomization process, the lighter they become, and the further they are carried by air pressure to burn properly away from the fuel nozzle. Various embodiments of the present invention are presented to improve this process.

[0011] In a preferred embodiment of the present invention, Figure 1A shows a fuel nozzle 100 for improving fuel atomization in a vaporizer or similar device. The fuel nozzle 100 preferably has a cylindrical body 102 having an outer surface 104 and an inner surface 106. The cylindrical body 102 is preferably made of a gasoline-resistant and heat-resistant material. A plurality of perforations 108 are disposed through one half of the cylindrical body 102, while a plurality of dimples 110 are disposed on the outer surface 104 of the other half of the cylindrical body 102. The fuel nozzle 100 further comprises a ferrule 112 disposed around one end portion of the cylindrical body 102. The ferrule 112 serves as a means for attaching or mounting the fuel nozzle 100 to a vaporizer or similar device, preferably in a removable manner. In one embodiment of the present invention, the fuel nozzle can be fixed inside the vaporizer. Figure 1B shows a rotational isometric view of the fuel nozzle 100, which has multiple dimples 110 arranged on the other half of the cylindrical body 102, and multiple perforations 108 protruding from the outer surface 104 through the inner surface 106.

[0012] Figures 1C and 1D show cross-sectional views of a fuel nozzle 100 according to a preferred embodiment of the present invention. The fuel nozzle 100 further comprises a fuel tunnel 114 that extends through the length of a cylindrical body 102 and is defined by an opening located in the center of the cylindrical body 102. A plurality of perforations 108 and dimples 110 are arranged around one end portion of the cylindrical body opposite the ferrule 112. As shown in Figure 1C, each of the perforations 108 passes through the outer surface 104 and inner surface 106 of the fuel nozzle 100. On the other hand, Figure 1D shows each of the dimples 110 having hemispherical cavities on the outer surface 104 of the other half of the cylindrical body 102.

[0013] Referring to Figure 1E, each of the perforations terminates on an outer surface, where the air turbulator 116 is defined by a hemispherical cavity that communicates with the fuel tunnel, preferably through a cylindrical through-hole 118.

[0014] In a preferred embodiment of the present invention, the perforations and dimples are configured to be arranged in circular rows around the circumference of a cylindrical body. More preferably, the circular rows are further configured in an alternating arrangement to ensure that adjacent perforations and dimples are closest to each other when arranged in multiple rows.

[0015] In some embodiments of the present invention, the diameters or surface areas of the hemispherical cavities from the dimples and the perforations may differ from each other. For example, the surface area of ​​the hemispherical cavity from the perforation may be larger than the surface area of ​​the dimple.

[0016] During the combustion process, as air gas enters the air-fuel mixture chamber, the air passing through the venturi section of the vaporizer draws fuel through the nozzle. Unlike conventional nozzles, which typically have only one outlet from which gasoline is injected into the air-fuel mixture chamber, the fuel nozzle of the present invention is provided with multiple dimples and multiple perforations, each of which is configured with an air turbulator. As air passes over the surface of the nozzle body, the air turbulator creates bulges in the form of hemispherical cavities, causing turbulence as the air adheres to the surface. This turbulence creates air vortices, delaying the separation of air within the turbulator. The turbulence reduces aerodynamic drag as the fuel is injected through the perforations in front of each agitator. This results in more atomized fuel, which combines with the air in the mixture chamber to provide better combustion.

[0017] The air turbulator, defined by the hemispherical cavity on the fuel nozzle, acts as a vortex generator, creating a thin turbulent boundary layer of air that clings to the surface of the fuel nozzle. This allows the smoothly flowing air to travel slightly away from the back of the nozzle where the multiple perforations for discharging liquid fuel are located, along the outer surface of the nozzle (air hug). This "air hug" results in a reduction in the size of the wake region, which helps optimize fuel atomization. [Brief explanation of the drawing]

[0018] [Figure 1A] A perspective view of a fuel nozzle according to a preferred embodiment of the present invention is shown. [Figure 1B] A perspective view of a fuel nozzle according to a preferred embodiment of the present invention is shown. [Figure 1C] A cross-sectional view of a fuel nozzle according to a preferred embodiment of the present invention is shown. [Figure 1D] A cross-sectional view of a fuel nozzle according to a preferred embodiment of the present invention is shown. [Figure 1E] A cross-sectional view of a fuel nozzle according to a preferred embodiment of the present invention is shown.

Claims

1. A method for improving fuel atomization in a carburetor by a fuel nozzle, the fuel nozzle comprising: a cylindrical body having an outer surface and a fuel tunnel disposed in the center of the inside of the cylindrical body, the fuel tunnel passing through the length of the cylindrical body and defined by a central opening that forms an inner surface therein; a plurality of perforations disposed on one half of the cylindrical body, each of which connects the inner surface and the outer surface of the cylindrical body and terminates with an air turbulator defined by a hemispherical cavity on the outer surface of the cylindrical body; and a plurality of dimples disposed on the outer surface of the other half of the cylindrical body, each of which is defined by a hemispherical cavity on the outer surface of the cylindrical body, the method comprising: The act of allowing air to enter the vaporizer, As the permitted air flows through each of the air turbulators of the plurality of perforations and through the plurality of dimples, the hemispherical cavities create bulges that cause the air to adhere to the outer surface, thereby causing turbulence, and the turbulence generates air vortices on the outer surface of the fuel nozzle. A method comprising the act of injecting fuel droplets into the air-fuel mixture chamber of the vaporizer through the plurality of perforations, wherein the injected fuel droplets are atomized by the generated air vortex.

2. The method according to claim 1, wherein both the plurality of perforations and dimples are arranged in a circular row around the circumference of the cylindrical body.

3. The method according to claim 2, wherein the circular rows are further arranged in an alternating pattern.

4. The method according to claim 1, wherein each of the perforations faces the downstream side of the fuel nozzle.

5. The method according to claim 4, wherein each of the dimples faces the upstream side of the fuel nozzle.

6. The method according to claim 1, further comprising a ferrule disposed around one end portion of the cylindrical body.

7. A fuel nozzle for improving fuel atomization in a carburetor, A cylindrical body having an outer surface and a fuel tunnel disposed in the center of the inside of the cylindrical body, wherein the fuel tunnel passes through the length of the cylindrical body and is defined by a central opening that forms the inner surface inside, A plurality of perforations disposed on one half of the cylindrical body, each of which connects the inner surface and the outer surface of the cylindrical body and terminates at an air turbulator defined by a hemispherical cavity on the outer surface of the cylindrical body, A plurality of dimples disposed on the outer surface of the other half of the cylindrical body, each of the dimples comprising a plurality of dimples defined by a hemispherical cavity on the outer surface of the cylindrical body, A fuel nozzle in which, as air flows through each of the air turbulators of the plurality of perforations and through the plurality of dimples, the hemispherical cavities create bulges that cause the air to adhere to the outer surface, thereby causing turbulence, and the turbulence generates air vortices on the outer surface of the fuel nozzle.

8. The fuel nozzle according to claim 7, wherein both the plurality of perforations and dimples are arranged in a circular row around the circumference of the cylindrical body.

9. The fuel nozzle according to claim 8, wherein the circular rows are further arranged in an alternating configuration.

10. The fuel nozzle according to claim 7, wherein each of the perforations faces the downstream side of the fuel nozzle.

11. The fuel nozzle according to claim 10, wherein each of the dimples faces the upstream side of the fuel nozzle.

12. The fuel nozzle according to claim 7, further comprising a ferrule disposed around one end portion of the cylindrical body.

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