Centrifuge including a rotor driveshaft with an elastic damping seal and corresponding shaft

摘要

A centrifuge comprising a rotor drive shaft including a flexible shaft surrounded by a sheath. The flexible shaft and the sheath are both rotationally secured at a first end. A second end of the flexible shaft extends beyond a second end of the sheath. A head is adapted to receive a rotor of the centrifuge. The head is rotationally secured to the second end of the flexible shaft. A member damps and limits a radial displacement of the flexible shaft with respect to the sheath. The damping and limiting member comprises an annular seal made from an elastic material. The annular seal is axially arranged about the flexible shaft and the sheath at the same level as and close to the head. A skirt is formed on head and surrounds the second end of the sheath. The skirt has an internal annular groove for receiving damping and limiting member. The skirt includes a lower transverse wall limiting the annular groove. The lower transverse wall is pierced with a bore which radially limits an offset of the flexible shaft with respect to the sheath. The damping and limiting member is arranged between the skirt and the sheath. The annular seal has a lip extending axially into the bore and is arranged radially between the skirt and the sheath.