Patent ID: 6960061

Claim:
A rotary pump comprising: a pump chamber adapted to be disposed above a liquid basin, a radial impeller with a vertical axis disposed in the pump chamber, an intake connecting piece disposed coaxially with the impeller and adapted to be positioned in the liquid basin, the intake connecting piece including an intake opening, one of: an inner part of the radial impeller which includes vanes and protrudes axially, and an axial impeller in the intake connecting piece for aspirating liquid in an interior region of the pump chamber, and at least one venting channel which leads from the interior region of the pump chamber to an outside and extends along a side wall of the intake connecting piece up to about a plane of the intake opening of the intake connecting piece, at least one said venting channel having a lateral opening in the side wall of the intake connecting piece which opens essentially in a radial direction to the pump chamber.