Patent ID: 7247133

Claim:
A decanter centrifuge with a hollow drum having a longitudinal axis of rotation and a direction of rotation ( 6 ), a screw conveyor in the drum comprising a core body ( 1 ) carrying at least one helical winding ( 2 ), wherein an inlet chamber ( 3 ) is provided in the core body ( 1 ), said inlet chamber having an inlet opening ( 5 ) for inlet of material into the drum from the inlet chamber ( 3 ), a central inlet ( 4 ) being provided in the inlet chamber ( 3 ) as well as an end wall ( 13 ) in the inlet chamber ( 3 ) opposite the central inlet ( 4 ), the inlet opening ( 5 ) having a delimitation surface ( 7 ), which is rear relative to the direction of rotation and extending substantially axially, said delimitation surface being provided with a wear reinforcement ( 8 ), and a preferably substantially tangentially extending edge ( 13 a ), which is distal relative to the central inlet ( 4 ), characterized in that the wear reinforcement comprises a wear reinforcement member ( 8 ) extending along the rear delimitation surface ( 7 ) and, when viewed in section transverse to the direction of the axis of rotation ( 6 ), extending around the rear delimitation surface ( 7 ), the wear reinforcement member ( 8 ) extending so far into the inlet chamber ( 3 ) along its wall that a concave back surface of the wear reinforcement member ( 8 ) facing the rear delimitation surface ( 7 ) has an interior portion ( 14 ) in the inlet chamber, said portion being positioned behind the foremost point ( 15 ) of the rear delimitation surface ( 7 ) viewed relative to the direction of rotation ( 6 ), that the wear reinforcement member ( 8 ) is provided with an abutment surface ( 11 a; 19 a ) with a component ( 11 b; 19 b ) facing tangentially opposite the back surface in abutment against an abutment surface associated with the core body ( 1 ) and which during operation prevents the wear reinforcement member ( 8 ) from moving tangentially forwards in the direction of rotation ( 6 ), and an abutment surface ( 19 c ) with a radially outwards facing component ( 19 d ) in abutment against an abutment surface associated with the core body ( 1 ) preventing the wear reinforcement member ( 8 ) from moving radially out of the core body ( 1 ), that at least one of said abutment surfaces associated with the core body ( 1 ) is constituted by a removable blocking member ( 17 ) and that the wear reinforcement member ( 8 ) and the inlet opening ( 5 ) are designed in such a manner that the wear reinforcement member ( 8 ) can be introduced to its operating position from the exterior side of the core body ( 1 ).