Patent ID: 6139260
Filing Date: 2000-10-31
Classification: F04D

Abstract:
A pump of a centrifugal- or half axial type for pumping of sewage water, the pump comprising:a pump housing having a wall including at least one feeding groove defined therein, a cylindrical inlet, and an outlet; andan impeller having a central hub, at least one vane with swept back leading edges, and an impeller shaft having an axis, the leading edges of the at least one vane being located in a plane substantially perpendicular to the impeller shaft;the at least one feeding groove in the wall of the pump housing arranged on a surface of the wall opposite the at least one vane of the impeller, the at least one feeding groove located upstream of the area of the leading edges of the at least one vane, the at least one feeding groove routing from the inlet towards the outlet and swept in the rotation direction of the impeller, the at least one feeding groove having a first side that connects to the surface of the wall with a smooth connection, and an opposing generally orthogonally directed second side that continuously transforms into a generally elliptic bottom.