LOBE PUMP WITH INNER BEARING
European Patent Office Patent
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Abstract
The invention relates to a lobe pump having: a pump housing with a pump chamber; an inlet opening and an outlet opening; a first multi-vaned rotary piston, which is situated in the pump chamber and is mounted rotatably about a first rotation axis; a second multi-vaned rotary piston, which is situated in the pump chamber and is mounted rotatably about a second rotation axis at a distance from the first rotation axis and meshes with the first rotary piston, the first and second rotary pistons being driveable in opposite directions and being designed to generate a flow of the conveyed medium from the inlet opening through the pump chamber to the outlet opening by oppositely directed rotation about the first and second rotation axes; and a drive device which is mechanically coupled to the rotary pistons to drive the rotary pistons. The invention is characterised by a first stationary shaft body which is connected to the pump housing and is situated inside the first rotary piston and by at least one first bearing for supporting the first rotary piston rotatably about the first stationary shaft body, wherein the bearing is situated on an outer surface of the first stationary shaft body and inside the first rotary piston.
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