Abstract: A plurality of flat plates are laterally disposed at an outer circumference of a hub and auxiliary vanes are disposed in parallel to at least side edges of each of said flat plates while being spaced apart from the side edges. Accordingly, an occurrence of eddy flows can be restricted, a peeling-off eddy flow can be reduced, agitating and mixing of gas-liquid can be made efficient without producing any damage to microorganisms or the lie and an agitating efficiency can be improved with a simple structure.

Abstract: A stirring blade unit includes a plurality of main blade bodies radially projected from the outer periphery of a boss and auxiliary blade bodies respectively provided at tip portions of the main blade bodies in a manner so as to be downwardly projected. With this arrangement, it is possible to prevent swinging of the rotational shaft, the fabrication and mounting of the auxiliary blade bodies is made easier, material costs are reduced, and the mounting space required is reduced.

Abstract: An agitating device includes substantially cylindrical tank having a depth greater than a diameter. An elongate plate-like baffle is mounted to an inner peripheral wall of the tank, a bottom end of the baffle terminating above the bottom of the tank to recreate a space between the bottom end of the baffle and the bottom of the tank. A shaft extends into the tank into a position adjacent to the baffle. The shaft is offset from the central axis of the tank and is spaced from the peripheral walls by a distance no greater than about the same distance as that separating the center of the tank from the baffle. An agitating vane is mounted to the shaft. The shaft is rotated in a direction such that a blade of the vane causes fluid in the tank to move axially along the baffle.

Abstract: A plurality of flat plates are laterally disposed at an outer circumference of a hub and auxiliary vanes are disposed in parallel to at least side edges of each of said flat plates while being spaced apart from the side edges. Accordingly, an occurrence of eddy flows can be restricted, a peeling-off eddy flow can be reduced, agitating and mixing of gas-liquid can be made efficient without producing any damage to microorganisms or the like and an agitating efficiency can be improved with a simple structure.

Abstract: An agitating vane in which a plate-like vane is disposed at an extreme end of a rotary shaft to agitate liquid has a feature that auxiliary vanes for covering a part of vane with a clearance being left are disposed in front of the surface of the vane in its rotational direction. Accordingly, a phenomenon of peeling-off caused by the eddy flow generated at the rear surface of the vane is eliminated by liquid flowing at a high speed at a clearance between the vane and the auxiliary vanes, a circulation flow of regulated flow state is attained and agitating efficiency is improved.