Introduction to generator set terms

Generator settorsional moment

The torsional torque output from the flywheel of the generator set is called torque, or torque for short, and its unit is Newton·meter (Nm) or kilogram force·meter (kgf.m). It refers to the heat generated by the combustion of fuel after it is mixed with air in the cylinder, which causes the gas to expand and perform work, thereby overcoming the frictional torque of each part and driving various auxiliary devices (such as fuel injection pumps, cooling water pumps, and lighting generators). The torque consumed by the crankshaft is finally transmitted to the flywheel through the crankshaft to provide the torque for use.

The force required by the generator set to drive the diesel engine chassis and traction agricultural tools is transmitted to the flywheel and becomes a reaction torque that hinders the rotation of the flywheel, which is usually called the load of the diesel engine. In actual work, the torque transmitted from the flywheel of the generator set should be equal to the load of the diesel engine.

Vibration isolation structure

The diesel generator set adopts a welded base structure, which is cold-worked and welded with medium-thick steel plates and boiler steel plates. The welded end caps at both ends support tilting block bearings that are insulated from the ground. Step-shaped gaskets are installed between the base feet and the bottom plate (table) so that the load of the base is concentrated on both ends of the foundation, symmetrically distributed on both sides, and quickly attenuates towards the middle. The generator feet are tested on site. The stress distribution is reviewed and adjusted to ensure the load distribution at both ends of the stator frame to improve the support stiffness of the end cover bearings connected to the stator frame to reduce the vibration of the unit.

Cooler technology

The intercooler of the diesel generator set is part of the supercharging system. When the air is compressed at a high ratio, it will generate a high amount of heat, which will reduce the expansion density of the air. At the same time, the engine temperature will be too high and cause damage. In order to obtain higher volumetric efficiency, the high-temperature air needs to be cooled before being injected into the cylinder. This requires the installation of a radiator. The principle is similar to that of a water tank radiator. It disperses high-temperature and high-pressure air into many small pipes, and normal-temperature air flows through the pipes at high speed to achieve the purpose of cooling (the gas temperature can be reduced from 150 degrees Celsius) down to about 50 degrees Celsius). Because this radiator is located between the diesel generator set and the turbocharger, it is also called a central cooler, or intercooler for short. Turbocharging working principle diagram, red is high-temperature exhaust gas, blue is fresh air.