VARIABLE ROTOR BLADE DIAGONAL FLOW PUMP AND DISCHARGE PUMP AND CIRCULATING PUMP

摘要

PURPOSE: To facilitate the machining of a conical hub surface by specifying the angle between the generatrix of a conical hub surface of a diagonal flow impeller and the center line of the stem shaft of a rotor blade so as to obtain a rightward downward G-H characteristic curve with no flection point over the entire blade angle of the rotor blade. ;CONSTITUTION: The hub surface 1a of a rotor blade diagonal flow impeller 1 and the hub side end face 2b of a rotor blade 2 of the impeller 1 are conical, the angle 6 between the generatrices of the hub surface 1a and the hub side end face 2b and the center line of the stem 21 of the rotor blade 2 is set to an angle of 90 deg. so that they are orthogonal to each other. Accordingly, a discharge volume (Q)-total head (Q) characteristic curve having no flection at a design total blade angle of the rotor blade 2 of the rotor blade diagonal flow impeller 1 and rightward downward inclined, can be obtained, and the impeller hub surface 1a and a casing liner inner surface 4a can be easily machined, thereby it is possible to lower the manufacturing cost.;COPYRIGHT: (C)1995,JPO