STIRRING DEVICE WITH A SHAFT, ADAPTED TO BE MOUNTED IN A FLUID-MIXING BIOREACTOR, AND METHOD FOR ASSEMBLING A STIRRING DEVICE

The stirring device (1), in particular for a fluid-mixing bioreactor, comprises a drive shaft (2) including a rod (20), an agitating element and a sleeve (3) of tubular shape. The sleeve forms a coupling sleeve receiving the shaft (2) therethrough and is directly rotationally coupled to the rod (20). The agitating element, which has a hub (10) with an annular side wall (8) delimiting an inner space and an impeller assembly comprising blades (6b), is indirectly rotationally coupled to the rod (20) via the sleeve (3) that is engaged in the inner space. One of an inner surface (S8) of the wall (8) and an outer surface (S3) of the sleeve is a guiding surface with progressively reduced cross section. Axial movement between the hub (10) and the sleeve (3) is prevented in a locked configuration of a sleeve fastening arrangement (30, 30'). Hub-sleeve contact areas can be axially distributed.