Centrifugal Pumps In Detail Flashcards
How do centrifugal pumps operate?
By utilising centrifugal force which is the force with which a body revolving around a centre tends to fly away from that centre.
How do liquids flow in a centrifugal pump?
When the impeller starts rotating, it generates a region of low pressure, and this pressure difference socks in liquid from the reservoir through the eye of the impeller.
What are the two main components of a centrifugal pump?
The impeller and the volute (case or diffuser).
What makes the impeller move?
The impeller is connected to a shaft, which is driven by an electric motor.
Where are centrifugal pumps used?
General water supply stations, circulating hot water in central heating systems, and air conditioning systems.
What are the 3 types of centrifugal pumps?
Radial flow, mixed flow and axial flow.
Describe radial flow.
Pressure is developed completely by centrifugal force.
Describe mixed flow.
Pressure is developed partly by centrifugal force and the lift of the vanes of the impeller.
Describe axial flow.
Pressure is developed by the propelling or lifting action of the vanes of the impeller.
At what angle does water enter the suction valve?
At 90 degrees to the plane of the impeller.
Describe closed coupled centrifugal pumps.
The pump casing is that carries the impeller, and the volume is bolted directly onto the flange of the electric motor.
Describe rigid coupled centrifugal pumps?
The pump casing is typically a different diameter to the motor flange. The impeller ris directly mounted onto a short extension if the motor shaft.
Describe flexible coupled centrifugal pumps.
There are 3 separate parts, the casing, the electric motor and the flexible coupling joining them. Longest looking one.
