Cooling method of diesel generator

Diesel generator cooling forms are generally divided into three types: air, hydrogen, and water. The cooling system of a general synchronous generator is closed, and the cooling medium is recycled.
1) Air cooling - Air cooling adopts the method of fan air supply. Cold air is blown against the end of the winding of the diesel generator set, the stator and the rotor of the generator set to dissipate heat. The cold air absorbs heat and turns into hot air. After the air between the stator and the rotor first merges, it is discharged through the air duct of the iron core and cooled through the cooler. The cooled air is then sent into the generator by the fan for circulation to achieve the purpose of heat dissipation. The machines generally use air cooling for medium and small synchronous generator sets. ,
2) Hydrogen cooling - Hydrogen cooling uses hydrogen as the cooling medium. The heat dissipation performance of hydrogen is better than that of air. Most large turbine generator units use hydrogen cooling.
3) Water cooling - water cooling adopts the method of double water internal cooling of the stator and rotor.
The cold water external water system of the stator water system flows through the water pipe to the water inlet ring installed on the stator base. It flows to each coil through the insulating pipe respectively. After absorbing the heat, it is collected through the insulated water pipe to the water outlet ring installed on the machine base. It then drains into a water system outside the generator for cooling.
The cooling of the rotor water system first enters the water inlet support installed on the side shaft end of the exciter, then flows into the center hole of the rotor shaft, then flows to the water collecting tank along several meridional holes, and then flows to each coil through the insulating tube. After the cold water absorbs heat, it flows into the water outlet tank through the insulating pipe, then flows to the water outlet support through the drainage hole on the outer edge of the water outlet tank, and is led out by the water outlet main pipe.
Since the heat dissipation performance of water is much higher than that of air and hydrogen, the generator sets of newly built large, medium and large generator manufacturers generally use water cooling.