ImpellerSimply put, an impeller is a rotor that produces inherent suction as part of the pump assembly. In the case of a boat, the impeller is made up of a series of flexible rubber blades attached to a central hub. The hub rotates around a shaft in a stainless steel liner inside the pump. Cold water is pumped through the impeller to the ship’s engine to cool it under load. A pump in a Marine engine has an impeller that draws water from outside the ship into the piping system.
There is an inlet on the impeller that provides a channel for water inside the boat, and rubber blades push fluid through the inlet. The impeller is the rotating part of the centrifugal pump, which pushes the fluid away from the center of rotation. As a result, energy is transferred from the pump to the water, which creates velocity in the water, making it move outward from the pressurized pump. The Archimedes screw can be seen as a very early and basic version of the impeller.
