This application claims priority from Indian patent application No. 3742/CHE/2013 filed on Aug. 23, 2013 which is incorporated herein in its entirety by reference.
Not Applicable
No Copyright Notification
1. Technical Field
Embodiments of the present disclosure relate generally to automotive technology and in particular to supplying air and fuel mixture to a combustion chamber.
2. Related Art
Often air and/or fuel are ignited in a combustion chamber to generate energy for various purposes. For example, the energy may be used to produce mechanical movement/actions. The air and fuel are mixed in a proportion to generate energy efficiently. In general, devices are used to control the supply of the air and fuel to the combustion chamber thereby controlling the energy generated. Carburetor is an example device that blends air and fuel for an internal combustion engine. Corroborator generally produces an explosive mixture of vaporized fuel and air.
Venturi 105 is a tube connecting outer air inlet 110 with combustion chamber 115 of engine. The throttle valve diaphragm 120 and throttle slide 125 are interconnected. A spring 185 is placed in the hollow space provided by throttle valve diaphragm 120 and throttle slide 125. The spring 185 is tightly coupled with throttle valve diaphragm 120 and throttle slide 125. The front end of accelerator wire (cable) is connected to throttle hand bar. The rear end of accelerator wire along with spring is attached to the flat end surface of jet needle 135 along the throttle slide 125. The throttle plate 170 is used to control the flow of air in the venturi 105 and creates a vacuum at throttle valve diaphragm 120. The butterfly valve is operated to allow vacuum at throttle valve diaphragm 120.
The fuel from fuel tank is a mixture of fuel and oil. The flow of fuel to float bowl 180 is controlled by floater 145 and float valve 150. The float valve 150 is placed on the floater 145. The level of fuel increases in float bowl 180 and induce the floater 145 to gradually close the inlet of float bowl 180 through float valve 150. Also, bendable float valve 150 is used to adjust the level of fuel in the float bowl 180. During the course of starting the engine, choke plunger 175 is pulled and a small volume of fuel is flown into the venturi 105. Jets are operated to supply continuous and controlled flow of fuel from float bowl into the venturi 105. Also, secondary intake is opened and outer air (air intake) is sucked by the pilot air jet 140 into the venturi 105. The pilot jet 160 is opened to allow small amount of fuel, which is flown into venturi 105. Outer air and fuel is mixed and flown at the pilot mixture screw 165. Flow of air and fuel mixture is adjusted by pilot mixture screw 165. The choke plunger 175 sprays out extra fuel. Then, choke plunger 175 is closed to attain idling state of engine. During the throttle, the throttle plate 170 is opened to create a vacuum space (passage) at throttle valve diaphragm 120. The vacuum passage retracts the throttle valve diaphragm 120. The jet needle 135 attached with throttle slide 125 is raised to open main jet 155 and needle jet 130. The fuel from float bowl 180 is passed through main jet 155 and needle jet 130. Air is flown from outer air inlet 110 of engine (primary). The air and fuel is mixed and passed towards the combustion chamber 115. The angle of throttle plate 170 determines the positions of throttle slide 125, amount of fuel to be sucked and air to be mixed at the venturi 105. Also, size of main jet 155 and needle jet 130 determines amount of fuel flow into the venturi 105. When the throttle is high, the throttle plate 170 is fully opened and vacuum occupies the passage of throttle valve diaphragm 120. And, throttle slide 125 and needle jet 130 are raised high. The large amount of air and fuel is passed through the venturi 105 and passed to the combustion chamber 115. During idling of engine, the throttle plate 170 is closed, throttle slide 125 retorts to original position which closes the needle jet 130 and restricts air from outer air inlet 110. The operation of the conventional carburetor is further described in the book titled “Holley: Carburetors, Manifolds and Fuel Injection”, authored by Bill Fisher which is incorporated herein by reference. Details of an example valve are described in India Patent Application number 2664/CHE/2013, which is incorporated herein by reference.
In one aspect of the present invention carburetor comprises a hollow first cylinder and a hollow second cylinder. In one embodiment, hollow first cylinder comprising plurality of nozzles formed on the lateral surface and nozzles providing flow path for a fuel to flow from the hollow region to outside of the later surface of the first cylinder. In another embodiment, hollow second cylinder placed on the first cylinder and the axis of the first cylinder and the second cylinder coincide. In another aspect of the present invention, sliding the second cylinder over the first cylinder, and number of nozzles through which fuel flows out increases when the outer cylinder is slide in first direction. In one embodiment, the first cylinder is placed in a first region through which air is sucked into the combustion chamber. In another embodiment, a throttle control operative to increase the engine power, may be coupled to the second cylinder such that increasing throttle pulls the second cylinder in the first direction.
Several embodiments are described below, with reference to diagrams for illustration. It should be understood that numerous specific details are set forth to provide a full understanding of the invention. One skilled in the relevant art, however, will readily recognize that embodiments may be practiced without one or more of the specific details, or with other methods, etc. In other instances, well-known structures or operations are not shown in detail to avoid obscuring the features of the invention.
The casing 205 provide suitable strength and shape for efficient carburetor operation. The casing may be shaped as curved, cylindrical, etc., and may be fabricated using any known technique such as foundry, casting etc. A suitable material such as aluminium, and/or other composite material may be used for fabricating the carburetor. The casing 205 is shown comprising an inner wall 205B and an outer wall 205A. The casing 205 may provide inverted ‘T’ shaped structure for the carburetor operation. The carburetor casing 205 comprises venturi 250A and 250B, mixing region 225 (mixing area or mixing chamber), and control area 230 with corresponding four openings.
The two openings in the outer wall 205A are air intake opening 210A and combustion chamber outlet 215B. The venturi 250A connects the air intake opening 210A and inner opening 210B. The venturi 250B connects inner opening 215A and combustion chamber outlet 215B. The third opening is on the top and may be used for throttle wire 255 which induces an action in the control area 230 for controlling the fuel and air quantity in the carburetor mixing region 225. The fourth opening at the bottom may be used to receive the fuel. Additionally, the casing 205 of carburetor may be constructed to protect the other carburetor components from external force/impacts.
Air intake opening 210A operates as an inlet for external air into the carburetor. The Air intake 210A supplies air for mixing in the mixing region 225 of the carburetor. The air from air intake opening 210A passes through venturi 250A and enters the mixing region 225 through inner opening 210B on the inner wall 205B of the casing 205.
The mixer region 225 receives the fuel through the inner cylinder nozzles 260. During suction cycle, the air and the fuel are mixed due to suction pressure in the mixer region 225. The mixture (combination of air and fuel) is sucked into the combustion chamber (not shown) through the inner opening 215A, venturi 250B and combustion chamber outlet 215 B. Appropriate air filters are attached to the air intake opening 210A of the carburetor to remove dirt, dust in external air. The shape of air intake opening 210A may be cylindrical. Combustion chamber (connected to combustion chamber outlet 215) is a component/part of an engine. Also, it is the region in which air and fuel mixture is ignited (burnt) to produce energy. The energy is transferred into mechanical force to drive a vehicle.
Solid base 220 is flat surface which supports the lower part of carburetor. In one example, the fuel inlet 235 of carburetor is made through the solid base 220.
The inner cylinder 280 and outer cylinder 270 together operate to control the flow of fuel mixture in to the combustion chamber. The outer cylinder 270 slides over the inner cylinder 280 during the control operation.
Inner cylinder 280 is hollow cylinder with inner and outer lateral curved surface. The inner hollow region of the inner cylinder 280 is coupled to the fuel inlet 235 such that the fuel flows into the hollow region of inner cylinder 280. The inner diameter of the inner cylinder 280 and the outer diameter of the inner cylinder 280 may be adjusted to give desired thickness and strength to the inner cylinder 280. Further, the outer diameter of the inner cylinder 280 may be adjusted to suite the size of the carburetor mixing region 225, quantity of fuel to be released, etc. The inner cylinder 280 comprises plurality of holes made though inner surface to outer surface (referred to as nozzles 260) to release the fuel in the hollow region into the mixer region 225. In one embodiment, the inner cylinder 280 is shown mounted vertical or perpendicular to the direction for air flow or venturi 250A and 250B. Alternatively, the inner cylinder 280 may be mounted in other suitable direction. The casing 205 may be molded accordingly. The inner cylinder 280 may be closed or sealed on the top side confining the fuel to flow out (released) only through the nozzles 260.
Outer cylinder 270 is hollow cylinder with inner and outer lateral curved surface. The inner surface of the outer cylinder 270 is coupled with the outer surface of the inner cylinder 280 such that it reciprocates with the inner cylinder 280. The outer cylinder 230 is designed invariably to inhabit or house the inner cylinder 280 such that, the axis of inner cylinder 280 and outer cylinder 270 are coincide. The outer diameter of the outer cylinder 270 is selected such that it occupies the mixing region 225 and slide up and down in the control area 230. Alternately, the outer diameter of the outer cylinder 270 is selected such that it closely couples with inner wall 205B of carburetor and slides up and down with support of the inner wall 205B in the control area 230.
The inner diameter of the outer cylinder 270 is selected such that the outer surface of the inner cylinder 280 and inner surface of the outer cylinder 270 are coupled together. For example, when the inner cylinder 280 is completely covered by the outer cylinder 270, the fuel in the inner cylinder 280 is prevented from flowing out of the inner cylinder 280. Accordingly, fuel flows out of the inner cylinder 280 when the outer cylinder 270 is slides up exposing one or more nozzles 260 to the mixing region 225.
Further, when the outer cylinder 270 is placed or pushed-down completely to the mixing region 225, the outer cylinder 270 covers or closes inner opening 210B and 215A thereby preventing airflow through the venturi 250A and 250B.
The outer cylinder 270 may be closed or sealed on the top side such that the fuel is prevented from escaping though outer cylinder 270. The top surface of the outer cylinder 270 is coupled to the throttle wire 255 (referred to as accelerator wire) such that the throttle or acceleration action (throttle control) causes the movement of the outer cylinder 270 along the axis of the cylinders.
Fuel inlet 235 is a pipe connecting the fuel tank (not shown) and inner cylinder 280. The fuel inlet 235 may be connected at the bottom of inner cylinder 280 as shown in
Clamp 240 is a small connective part mounted on outer cylinder 270. The clamp 240 may be attached with throttle wire 255 of vehicle. The clamp 240 may use a locking mechanism to hold the throttle wire 255. Also, the clamp 240 may sustain the inward and outward pressure on throttle wire.
Spring 245 coupled in between inner wall 205B of carburetor and upper surface of upper cylinder 270. The spring 245 exert pressure pushing the outer cylinder 270 to the mixing region 225. Thus, when the throttle is operated the outer cylinder 270 is lifted thereby compressing the spring 245. Also, when the spring 245 expands (upon release of the throttle), the outer cylinder 270 is pushed completely till the solid base 220.
Throttle wire 255 is connected with clamp 240 mounted on outer cylinder 270. The other end of throttle wire 255 may be connected to the accelerator grip/control of vehicle. The accelerator control is operated to provide a movement on outer cylinder 270 through throttle wire 255 and clamp 240.
Nozzle 260 is small opening in the inner cylinder 280. In one embodiment, the inner cylinder 280 is perforated to craft a nozzle 260. The size and shape of nozzle 260 may be designed to suite the release of the fuel. The nozzle 260 is internally connected with hollow space of inner cylinder 280. The nozzle 260 streams the fuel to the mixing region 225. The outer surface of inner cylinder 280 is covered by hollow outer cylinder 270 which closes the nozzle 260 of inner cylinder 280. Similarly, a number of nozzles 260 are crafted on the outer surface of inner cylinder 280.
The upper surface 305 of outer cylinder 301 may be flat and circular. In one embodiment, outer cylinder 301 is made of metal etc. In another embodiment, the clamp is mounted in perpendicular to upper surface 305. Also, a holder may be crafted to hold the lower part of spring.
The lower surface 310 of outer cylinder 301 may be circular, have an opening substantially equal to the inner diameter of the outer cylinder 301 to accept the inner cylinder of substantially of same outer diameter. The lateral or curved surface 315 covers area of the cylinder and surface area connects upper surface 305 and lower surface 310 of outer cylinder 301. The hollow surface of outer cylinder 301 may be matched with lateral surface area of inner cylinder. The lateral or curved surface area of outer cylinder 301 is determined through the equation 2πrh, and also the total surface area of outer cylinder 301 is determined through the equation 2πr(r+h), where ‘r’ is the radius of any of upper surface 305 or lower surface 310 and ‘h’ is the height of the outer cylinder 301.
In one embodiment, the arrangement of nozzles (355, 360, 365, 370 and 375) in inner cylinder 350 may determine the volume of fuel (per unit length of the movement of the outer cylinder) that may be released into the mixing region through the nozzles. Also, the release of fuel is directly proportional number of nozzles exposed to the mixing region. In another embodiment, the lower nozzles may have larger diameter and upper nozzles may have smaller diameter or vice versa. In another embodiment, the arrangement of nozzles (355, 360, 365, 370 and 375) may be of circular, squared, rectangular shapes to improve the control of flow of fuel through nozzles.
Following paragraph describes the example volume of fuel released from the inner cylinder through nozzle.
The components outer cylinder 270, spring 245, and throttle wire 255 may be operated to start the engine and carburetor. The throttle wire 255 may be initially triggered to start the engine which is coupled with carburetor. The throttle wire 255 is moved upward to trigger the fuel ignition process.
During the suction cycle, the air is sucked from air intake opening 210A through venturi 250A and mixed with the fuel collected in the mixing region 225 and the air and fuel mixture is then sucked into the combustion chamber through the venturi 250B. In another embodiment, fuel and air is mixed at venturi 250B of carburetor and passed to combustion chamber of engine.
The lifting of the outer cylinder 270 may be caused using any known mechanism when engine starts. A definite volume of fuel and air may be continuously flown from nozzle 260 and air intake respectively to combustion chamber in order to maintain the active ignition state of engine (referred to as idling).
In one embodiment, when the throttle wire 255 is released the outer cylinder 270 may move downwards by decompressing action of the spring 245. In one embodiment, the outer cylinder 270 reaches a predetermined position (example position as in
In one embodiment, when the throttle wire 255 is fully released, the outer cylinder 270 is pushed downwards by the spring 245. In one embodiment, the outer cylinder 270 reaches an original position (fully closed state as in
While various examples of the present disclosure have been described above, it should be understood that they have been presented by way of example, and not limitation. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described examples, but should be defined in accordance with the following claims and their equivalents.
Number | Date | Country | Kind |
---|---|---|---|
3742/CHE/2013 | Aug 2013 | IN | national |
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/IN2014/000542 | 8/22/2014 | WO | 00 |