Patent ID: 9534601
Date: 2017-01-03
CPC Classifications: F04D,F05D

Claim:
1. A pump, comprising: an impeller having a periphery; a pump housing having an inner wall with an annulus; and a tongue that truncates an outlet or a diffuser from the annulus of the pump housing, wherein the inner wall of the pump housing forms approximately circular profiles in all cross-sections between two axial outer positions for cross-sectional areas of flow at the periphery of the impeller, the cross-sections being between the two axial outer positions and vertical to an axis of rotation, wherein the approximately circular profiles are mainly concentric with the impeller and have a continuously increasing radius from one of the two axial outer positions toward the other one of the two axial outer positions, and wherein the tongue does not contact the approximately circular profiles between the two axial outer positions.