Description

INGCO S-LM-C-GLM141181,Carburetor(S-LM-C-GLM141181)

product details:

The carburetor in a gasoline lawn mower is a crucial component responsible for mixing air and fuel in the correct proportions to create a combustible mixture for the engine. Here’s a breakdown of its key functions, parts, and how it works:

Function:

The primary function of the carburetor is to:

• Meter Fuel: Control the amount of gasoline entering the engine based on engine demand (throttle position) and operating conditions.
• Mix Air and Fuel: Combine the metered fuel with incoming air to create a well-atomized air-fuel mixture for optimal combustion.
• Deliver the Mixture: Deliver the prepared air-fuel mixture to the engine’s combustion chamber.

Components:

A typical lawn mower carburetor consists of several key parts:

• Float Bowl: A reservoir that holds a constant level of fuel.
• Float: A buoyant mechanism that controls the fuel inlet valve based on the fuel level in the float bowl. When the fuel level drops, the float descends, opening the valve to allow more fuel in. As the fuel level rises, the float ascends, closing the valve to maintain a constant level.
• Fuel Inlet Valve: Located at the bottom of the float bowl, this valve regulates the flow of fuel into the bowl based on the float’s position.
• Main Jet: A calibrated orifice (opening) that controls the flow of fuel into the main air passage for high-speed operation (when the throttle is open).
• Venturi: A narrowed section in the air intake passage. As air flows through the venturi, its velocity increases, creating a low-pressure zone that draws fuel from the main jet and mixes it with the air.
• Idle Mixture Screw: A screw that adjusts the amount of air entering the engine at idle speed (when the throttle is barely open).
• Throttle Valve (Butterfly Valve): A valve controlled by the throttle lever that regulates the overall airflow into the engine. By opening or closing the throttle valve, you control the engine speed.
• Needle Valve (Optional): Some carburetors have a needle valve that further regulates fuel flow at mid-range engine speeds.

How it Works:

1. Fuel Delivery: Gasoline from the fuel tank flows into the carburetor through a fuel line.
2. Float Regulation: The float maintains a constant fuel level in the float bowl by controlling the fuel inlet valve.
3. Air Intake: Air enters the carburetor through the air filter and flows into the venturi section.
4. Fuel Metering: As air speeds up through the venturi, the low pressure draws fuel from the main jet and mixes it with the air. This creates a well-atomized air-fuel mixture.
5. Idle Mixture: The idle mixture screw allows additional air to bypass the venturi at idle speed for a leaner air-fuel mixture suitable for slower engine operation.
6. Throttle Control: The throttle valve controls the overall airflow into the engine. Opening the throttle increases airflow, requiring more fuel to maintain the proper air-fuel ratio. This additional fuel is drawn through the main jet due to the increased venturi effect.
7. Combustion: The prepared air-fuel mixture is delivered to the engine’s combustion chamber, where the spark plug ignites it, creating the power that drives the lawn mower.