Diesel generators typically have three cooling methods: air, hydrogen and water. In general synchronous diesel generators, the cooling system is closed and the cooling medium is recirculated.
Air cooling: Use cold air to blow the winding end of the diesel generator set, and the stator and rotor of the diesel generator set to dissipate heat. Cold air absorbs heat and becomes hot air. After the air between the rotors is gathered, it is discharged through the air duct of the iron core and cooled by the cooler. Then, the cooled air is sent to the generator and recovered by the fan to achieve the purpose of heat dissipation. Diesel generator air coolers are usually small and medium synchronous generator sets.
Hydrogen cooling: Hydrogen cooling uses hydrogen as the cooling medium. Hydrogen dissipates heat better than air. Most large turbine generator sets use hydrogen for cooling.
Water cooling: Water cooling is a dual water cooling method for the stator and rotor.
The cold water of the stator water system flows from the external water system to the water inlet ring installed on the stator through the water pipe, and then flows to the coil through the insulation pipe to absorb heat, and then collects the water through the insulation pipe, and the water outlet ring is installed on the frame. It is then discharged to the water system outside the generator for cooling.
The cooling of the rotor water system first enters the water inlet bracket installed on the side shaft end of the exciter, then flows into the central hole of the rotating shaft, flows to the water collecting tank along several meridian holes, then flows to the coil, and passes through the insulating tube. After the cold water absorbs heat, it flows into the water outlet tank through the insulation pipe, and then flows to the water outlet support through the drainage holes 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 diesel generator sets of newly built large, medium and large diesel generator manufacturers usually use water cooling.
