Patent ID: 8371831

Claim:
A centrifugal discharge pump for electric household appliances, comprising: a working chamber which has an intake opening and a delivery opening; an open impeller arranged inside said working chamber and rotatable about a main axis so as to move a discharge stream of the electric household appliance coming from the intake opening through the delivery opening; and motor means designed to drive said impeller by means of a transmission shaft arranged along said main axis, wherein said impeller comprises a support element arranged in a plane perpendicular to the main axis and integral with the transmission shaft, and a plurality of blades projecting from said support element, said impeller having, between said blades, along the main axis, a free space of predefined volume for allowing removal through the centrifugal pump of foreign solids present in the discharge stream, wherein the support element is a disc centered on the main axis, the blades extending along said disc from a peripheral edge of said disc to a minimum radius from the main axis, wherein two blades are provided, the blades directed so that the free space passes diametrically across said disc, without intersecting either one of said blades, and wherein the free space which passes diametrically across the disc forms an unobstructed corridor having a width equal to at least twice the minimum radius.