Analysis Of Carburetor Structure

Carburetor is commonly known as "carburetor". It is the most important equipment in the fuel supply system of gasoline engine. It is used to volatilize gasoline and form a uniform combustible mixture with air.It is usually composed of parts such as float, float chamber, needle valve, throat, injection pipe and metering hole. The gasoline delivered by the gasoline pump enters the float chamber from the inlet. There is a needle valve connected to the float in the float chamber to control the oil level to keep it at a certain oil level. The gasoline enters the injection pipe from the float chamber through the metering hole. The outlet of the injection pipe is about 3 to 5 mm higher than the oil level in the float chamber to prevent gasoline from overflowing. When the piston moves downward and the intake valve opens, the air from the air filter enters from the inlet and flows into the carburetor through the choke valve. The air flows through the throat and forms a negative pressure due to the sudden increase in flow rate. The gasoline is ejected from the injection pipe under the action of the pressure difference and is blown into countless fine oil droplets by the high-speed air. The oil mist evaporates along the way and mixes with the air to form a uniform combustible mixture, which then enters the cylinder. The amount of gasoline sprayed out of the injection pipe is determined by the diameter of the metering hole, and the amount of combustible mixture entering the cylinder is controlled by the throttle valve (commonly known as the "throttle"). According to the direction of air flow, there are two types: updraft and downdraft. According to different structures, there are single-injection pipe carburetors and multi-injection pipe carburetors. Simple carburetors can only meet the needs of small gasoline engines with very stable loads. For most gasoline engines with frequently changing workloads, carburetors equipped with a series of auxiliary devices such as starting, idling (i.e., idling), enrichment, and acceleration must be used to automatically change the concentration of the combustible mixture according to various load changes and different working conditions to ensure good engine performance and low fuel consumption.
1. Gasoline inlet 2. Needle valve 3. Float 4. Float chamber 5. Measuring hole 6. Air inlet 7. Choke valve 8. Injection pipe 9. Throat 10. Throttle valve 11. Intake valve 12. Air valve 3. Piston