Engineering practice of external water cooling system for electric motors in large underground drainage pump stations
The large underground drainage pump station has a large installed capacity,high equipment heat generation,and poor heat dissipation conditions.In order to prevent the air temperature in the pump station from exceeding the operation limit,the water pump unit is equipped with a water-cooled electric motor,and an external water cooling system is used to cool the electric motor.The heat generated during the operation of the electric motor is discharged outside the pump station.Based on engineering practice,the required heat transfer capacity and cooling water volume of the cooling system are calculated,and two schemes are proposed:open direct discharge and secondary heat exchange.After comparing the technical and economic schemes,it is determined to adopt the secondary heat exchange cooling system scheme.Based on the determined technical scheme and design principles,the equipment for cooling system heat exchange,pressurization,filtration,circulation,constant pressure water replenishment,and control are selected.
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