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SIMPLE CARBURETOR - CONSTRUCTION AND WORKING

CONSTRUCTION OF SIMPLE CARBURETOR : 



The main Components of Simple Carburetor are : Float Chamber, float, nozzle, venturi, throttle valve, inlet valve, and metering jet . In the float chamber, a constant level of petrol is maintained by the float and a needle valve. 

The float chamber is ventilated to atmosphere.  This is used to maintain atmospheric pressure inside the chamber. The float which is normally a metallic hollow cylinder rises and closes the inlet valve as the fuel level in the float chamber increases to certain level.

The mixing chamber contains venturi, nozzle and throttle valve. The venturi tube is fitted with the inlet  manifold. This tube has a narrow opening called venturi. A nozzle is provided just below the centre of this venturi. The nozzle keeps the same level of petrol as that of the level in the float chamber. The mixing chamber has two butterfly valves. 

One is to allow air into the mixing chamber known as choke valve. The other is to allow air -fuel mixture to the engine known as throttle valve. 

WORKING :

During the suction stroke, vacuum is created inside the cylinder. This causes pressure difference between the cylinder and outside the carburetor. Due to this, the atmosphere air enters into the carburetor. The air flows through venturi. The venturi increases the velocity of air and reduces the pressure. This produces the partial vacuum at the tip of the nozzle. Because of this vacuum, The fuel comes out from the nozzle in the form of fine spray. These fine fuel particles mix with the incoming air to form air- fuel mixture. Thus, it gives a homogenous mixture of air fuel to the engine.   

 

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