Artist: The difference between oil-filled submersible pump and water-filled submersible pump

The so-called water-filled submersible pump is to add water to the motor to cool the motor before the pump works. Customers may ask, if the motor is filled with water, it will not be damaged. We do not add water to the motor here, but add water to the protective shell outside the motor, cooling the motor by water.
Oil-filled submersible pump is to refuel the motor, its main function is the same as water. It's just that the replacement period of lubricating oil is shorter than that of adding water.
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