VERTICAL MIXED FLOW PUMP
Variable pitch blade pump
By adjusting blade opening to infinite stage, water flow and head can be achived and acordingly it makes energy-saving.
There are hydraulic type and mechanical type for variable pitch blade pump.
The pump can be started with impeller set at minimum opening, which faciliates starting with small starting torque.
Operation near best efficiency point makes effective against cavitation.
H-Q curve, System curve "R", and B.H.P.curve "L" are shown as left.
Pump operating point will be the crossing point of H-Q curve and System curve "R".
B.H.P. will be the point on the B.H.P. curve corresponding to the point on the operating curve.
B.H.P. shown as oblique lines will be reduced.
Comparison of hydraulic type and mechanical type
|Hydraulic type||Mechanical type|
|Operation Power||Oil pressure||Electric actuator|
|Pump size||Large size of 1500mm or more||Minor size below 2500mm|
|Operation mechanism||Pressure oil is introduced into servo cylinder and operating rod is operated up and down with a servo piston||An operating rod is operated up and down with worm gear and screw mechanism|
|Installation position of blade control system||Motor top||Middle of pump and motor|