Centrifugal pump for processing liquids containing abrasive constituents, more particularly, a sand pump or a waste-water pumper

摘要

A centrifugal pump for processing liquids containing abrasive constituents comprising a housing with a suction opening and a delivery opening and an impeller and having on either side sealing faces located at least partially on the outer side of a sealing slot in which slot, near the entrance side, an annular chamber is formed and means are provided for rotating the liquid in the chamber and near the outer circumference radial, outwardly directed ducts communicate with the annular chamber and open out by a diameter which is smaller than the diameter of the impeller.