Patent ID: 7182570

Claim:
Centrifugal pump comprising: a casing ( 10 ) that defines a chamber ( 11 ) provided with a water intake aperture ( 12 ) and a water delivery aperture ( 13 ), and an impeller that is adapted to rotate within said chamber and is formed by a central hub ( 14 ) which extends axially towards the intake aperture ( 12 ) and a disk ( 15 ) provided with blades ( 16 ) extending radially with respect to central hub ( 14 ), the blades ( 16 ) extend from a surface of the disk ( 15 ) that faces the intake aperture ( 12 ) of the pump, said impeller is provided with at least a slit ( 20 ) adapted to generate a negative pressure on the rear surface of the bladed disk ( 15 ) during the rotation of the impeller, said blades having a U-shaped conformation with the aperture facing the rear side of the bladed disk ( 15 ), and the recess of the blades ( 16 ) forming a respective slit ( 20 ), characterized in that the disk ( 15 ) and the blades ( 16 ) forms a continuous surface extending radially from the central hub ( 14 ) so as to guide the flow of water from the center to the periphery of said impeller and prevent water from passing directly through the slit ( 20 ).