Brief description of the structure of the cylinder head and combustion chamber of diesel generator set

Cylinder head is an important part of diesel generator set, cylinder head has a variety of roles such as sealing the combustion chamber, fixing the valve, allowing air, fuel and exhaust gas through the engine airway, etc. In many engines, the cylinder head also contains the combustion chamber of each cylinder or piston.

 

1. Manufacture of cylinder head

 

Cylinder head can be made of cast iron or aluminum. Aluminum cylinder head can reduce the weight of the engine, but aluminum conducts heat faster than cast iron, and also expands more than cast iron when heated, which may lead to warpage. Both aluminum and cast iron parts are made by pouring the hot liquid metal into a sand core and casting it. Cylinder heads must have coolant passages, which means that sand cores must also be used in the casting process. In addition, channels must be cast for the air intake and exhaust channels. After the cylinder head is cast, it must be machined in order to fit the intake and exhaust manifolds, valves, spark plugs, injectors and other accessories, and to provide a good seal for the cylinder.

 

2. Intake and exhaust tracts

 

The intake and exhaust tracts must be cast in the cylinder head of the diesel generator set to allow air and fuel to pass through the cylinder head into the combustion chamber. It would of course be ideal if each valve had an airway, but because of space issues, sometimes the airways are combined. The reason for using forked air passages is that each cylinder uses these passages at different times.

 

3. Coolant passages

 

The cylinder head has large openings cast into it to allow coolant to flow through the head. The coolant must circulate throughout the cylinder head to carry away excess heat. The coolant flows through channels in the cylinder body, through the cylinder gasket and into the cylinder head. The coolant then flows through the other parts of the cooling system, which varies from engine to engine.

 

4. Combustion chamber

 

The shape of the combustion chamber affects the efficiency of the engine. Commonly used combustion chamber has two forms: wedge-shaped combustion chamber and hemispherical combustion chamber. There are several terms used to describe the combustion chamber. Turbulent flow refers to a fast moving gas. As the gas moves, it comes into full contact with the combustion chamber and the piston. Turbulent flow results in better combustion because the air and fuel are well mixed.