Like in every centrifugal pump, the liquid that axially enters our pumps through the suction pipe is perpendicularly guided by the blades of the impeller in an axial direction. An electric motor or internal combustion engine drives the pump shaft on which the impeller is installed. The liquid entering the impeller through the suction pipe is deflected perpendicularly by the blades in the centrifugal impeller in a radial manner. The centrifugal forces acting on each liquid particle originate during the passage of liquid through the blades, increasing pressure and speed. After the fluid exits the impeller, the fluid accumulates in the case, scroll or volute. Due to the type of case, the flow velocity is reduced again slightly with an increase in fluid pressure
Fundamentally both our drag and centrifugal pumps are nearly equal; including its external appearance. The difference is in the technology that is applied to transform the energy through the impeller. In dragpumps, transformation is performed through the dragpeller, in centrifugal pumps it is done through the centrifugal impeller.
The impeller is a mobile element formed by divergent blades or vanes attached to a shaft which receive power from a motor. The impellers designs may be:
- Open: They have the advantage of allowing the passage of impurities, but have low efficiency
- Closed: when blades are attached in a lateral manner to two discs
- Semi-open: when they are attached to a disk