A centrifugal pump is one of the simplest pieces of equipment.
Its purpose is to convert energy of an electric motor or engine into velocity or
kinetic energy and then into pressure of a fluid that is being pumped. The
energy changes occur into two main parts of the pump, the impeller and the
volute. The impeller is the rotating part that converts driver energy into the
kinetic energy. The volute is the stationary part that converts the
kinetic energy into pressure.
Liquid enters the pump suction and then the eye of the impeller.
When the impeller rotates, it spins the liquid sitting in the cavities between
the vanes outward and imparts centrifugal acceleration. As the liquid
leaves the eye of the impeller a low pressure area is created at the eye
allowing more liquid to enter the pump inlet.
Centrifugal Pumps are classified into three general categories:
Flow - a centrifugal pump in which the pressure is developed wholly by centrifugal
Flow - a centrifugal pump in which the pressure is developed partly by centrifugal
force and partly by the lift of the vanes of the impeller on the liquid.
Flow - a centrifugal pump in which the pressure is developed by the propelling or
lifting action of the vanes of the impeller on the liquid.