Working principle of carburetor

The function of carburetor is to atomize gasoline and mix it with air to form combustible mixture, and then send it to each cylinder. When gasoline is pumped by gasoline, such as the float chamber in carburetor, there is an empty space in the float chamber, which can form a (vacuum) pressure difference with the nozzle through the external gas pressure, and directly spray the oil into the roar tube, which becomes oil drops and mixes with the air passing through the air filter at the upper part of the roar tube. The carburetor is divided into five systems: main fuel supply, idle speed, concentration, acceleration and start-up, and its structure is complex. The above is just a brief introduction. If you need to understand, you must consult books.

Under various working conditions such as engine start, cold start, acceleration, idle speed and normal operation, a certain amount and concentration of combustible mixture is provided. It comprises a main oil supply system, an idle oil supply system, an overspray hole, an acceleration pump, a throttle valve, an atomizing throat, a choke valve, a quick idle mechanism, an air conditioning speed-increasing mechanism, an oil level floating adjustment device and other devices. The gasoline is sucked out of the float chamber under the siphon effect of the high-speed airflow flowing through the main chamber and the auxiliary chamber, and at the same time, the gasoline is broken into fine particles under the cutting effect of the airflow to form a preliminary mixed gas mixture, which is heated and evaporated by the intake manifold, intake piston and the like to form combustible gas.

Under the suction of the intake stroke, air flows through the carburetor at high speed.

Air flows through the throat of the carburetor (where the cross-sectional area of the air passage is reduced) to form a vacuum degree, and the nozzle opening connecting the float chamber is also in the throat, and the oil is sucked out from the nozzle. The high-speed intake airflow blows and atomizes the gasoline sucked into the carburetor throat, forming a combustible mixture that enters the cylinder.