Patent ID: 6017187
Filing Date: 2000-01-25
Classification: F04D

Abstract:
A centrifugal pump comprising a housing, at least one impeller comprising a plurality of impeller blades and having an impeller outlet, said impeller being arranged in said housing so as to be rotatable about an axis of rotation, and a diffuser device arranged following the impeller for converting kinetic energy imparted by the impeller to a pumped medium into pressure energy, said diffuser device comprising flow-guiding surfaces extending toward larger diameters and having leading edges situated opposite the impeller outlet, said leading edges being oriented at an angle relative to the axis of rotation of the impeller such that as the impeller rotates, trailing edges of the impeller blades pass by said leading edges of the diffuser device and punctiform overlap occurs between the respective trailing edges of the impeller blades and the leading edges of the diffuser device, said leading edges of the diffuser device defining a cylindrical surface coaxial with said axis of rotation.