Patent ID: 7585147

Claim:
A pressurizing centrifugal pump having: a drum-shaped case provided with an inlet and an outlet; an impeller provided with a plurality of blades that have a sweepback angle in a rotation direction and that protrude radially from a boss portion on a side surface of a blade plate; a pressure portion provided with a pressure surface that faces the blades and that forms a pressure chamber converging from the inlet side to the outlet side, and with a pressure partition wall that is provided proximate to a side surface of the blades and that prevents leakage of fluid in blade chambers; and a pump chamber provided in the drum-shaped case, in which the impeller is provided opposite to the pressure portion; the pump comprising: a blade surface of the blade provided protruding from the blade plate having a gentle blade forward inclination angle from a plain view; and a blade outer surface, which is an outer portion from a mid-portion of the blade surface, having a bent shape having a blade outer forward inclination angle, which is steeper than the blade forward inclination angle.