Patent ID: 8821361

Claim:
A centrifugal separator comprising: a driving portion including a driving shaft; and a swing rotor provided at an end of the driving shaft, the swing rotor including, a rotor body, a through-hole passing through the rotor body from an upper side in an axial direction of the driving shaft, pin insert grooves which are provided to the through-hole parallel with the axial direction of the driving shaft, the pin insert grooves opposing each other in a diametric direction of the through-hole and only partially penetrating the rotor body, a cut-out portion perpendicular to the through-hole and formed outwards in a radial direction of the driving shaft, and a bucket including, a bucket body that accommodates a vessel and has a contact surface which is configured to contact the rotor body during centrifugal separation, and a cap assembly that seals the bucket body and has a swing shaft extending in a direction perpendicular to a longitudinal direction of the bucket, wherein the swing rotor is rotated when the bucket is inserted into the through-hole, to swing the bucket, wherein the cap assembly includes: a rotating portion for rotating the cap assembly relative to the bucket body; a cylindrical portion provided above the rotating portion in the longitudinal direction; and an external threaded portion which can be screwed to an internal threaded portion formed to the bucket body; wherein the swing shaft includes: an annular member including a through-hole through which the cylindrical portion penetrates; and two shaft portions extending in opposed directions from the annular member, wherein a stopper member that prevents the swing shaft from dropping out of the cylindrical portion is provided to the cylindrical portion, wherein the swing shaft is supported by the cylindrical portion, and can be moved in the longitudinal direction of the bucket relative to the bucket body and rotated about a longitudinal central axis of the bucket, and wherein a diameter of the rotating portion is smaller than a length between distal ends of the two shaft portions in the shaft direction and larger than an outer diameter of the annular member.