Patent ID: 9429155
Filing Date: 2016-08-30
CPC Classification: F04C

Claim Text:
1. A vane cell pump comprising: an electrical pump unit that has a pump chamber into and out of which a fluid can flow; a rotor with a number of vanes; said vanes being arranged to move in the rotor such that the fluid can be compressed before flowing out from the pump chamber; a sound-damping mechanism in fluid communication with the pump chamber; a sound-damping cover attached to a part of the pump chamber such that a sound-damping volume is defined; a preliminary sound-damping mechanism with at least one preliminary sound-damping outlet from which the fluid can flow, said preliminary sound-damping mechanism being at least partially within the sound-damping volume; the preliminary sound-damping outlet having a cross-sectional profile formed as a shape occurring between two opposing arcuate lines which intersect at two vertices, said cross-sectional profile being located at an entrance to said preliminary sound-damping outlet, said profile tapering only in the direction of fluid outflow.