Patent ID: 6877967

Claim:
An eccentric single-rotor screw pump comprising: a stator; an eccentric screw rotatably arranged within said stator movable by a drive in a rotational direction via a propeller shaft; and a housing having a housing portion surrounding at least a part of the propeller shaft in a circumferential direction, and at least an interspace being provided radially between said housing portion and at least a part of the propeller shaft, into which said interspace a medium fed in through a feed opening is movable, and out of which said medium is movable to an entry cross-section of the eccentric screw-stator arrangement, in the zone of the interspace, at least a means for conveying the medium is provided to influence the movement of the medium from the feed opening to the entry cross-section of the eccentric screw-stator arrangement, with the propeller shaft being at least in part provided with a coating or a cover in a zone of a shaft portion of a screw; a radial inside portion of said screw has at least one zone extending relative to the propeller shaft in an axial direction and/or a circumferential direction, and via which said screw supports the propeller shaft; and whereby said at least one zone of the screw lying inside, which extends into at least one of the circumferential direction and the axial direction, is covered radially outside by said cover or coating.