Patent ID: 6585493
Filing Date: 2003-07-01
Classification: F04D

Abstract:
A hygienic self-priming centrifugal pump comprising:a pump housing provided with an inlet opening and a pressure connecting piece; and an impeller wheel having a hub, said impeller wheel being configured to rotate inside said pump housing, said inlet opening being connected to an axial liquid ring pump section including an auxiliary housing and a pump screw, said pump screw being mounted on and in extension of the hub of the impeller wheel, wherein a recycling pipe for liquid is arranged as a connection between the pressure connecting piece of the centrifugal pump and one of: the auxiliary housing of the liquid ring pump section, an inlet nozzle of the auxiliary housing, and an inlet pipe for the pump, all inner surfaces in the pump housing and the auxiliary housing in direct contact with the liquid are smooth and rounded and without holes, crevices, beads or burrs, and the connection of the recycling pipe to the auxiliary housing of the liquid ring pump section, to the inlet nozzle thereof, or to the inlet pipe for the pump is arrange tangentially relative to the respective part.