Patent ID: 8485716
Filing Date: 2013-07-16
Classification: B01F,Y10T

Abstract:
1. An agitation apparatus including an agitation vessel, an agitation shaft, and an upper blade and a lower blade fixed to the agitation shaft, wherein the upper blade is configured by upper agitation blades arranged at a plurality of levels; as viewed from above, each of the upper agitation blades has cutout portions at positions forward and rearward in a rotating direction in a range between lines connecting two blade ends of the upper agitation blade to a center of the agitation shaft, each upper agitation blade being inclined at an elevation angle with respect to the rotating direction, each of highest upper agitation blades being arranged forward from an adjacent one of lowest upper agitation blades with respect to the rotating direction in such a manner that the highest upper agitation blade has an overlapped portion with respect to the lowest upper agitation blade, and wherein, as viewed from the side, a horizontal cross section including a lower end of the highest upper agitation blade is located below a horizontal cross section including an upper end of the adjacent lowest upper agitation blade; each of the lowest upper agitation blades is arranged vertically adjacent to the lower blade, wherein, as viewed from above, a line on a plane connecting a lower end portion of the lowest upper agitation blade to the center of the agitation shaft is arranged at a predetermined angle with respect to a center line of the lower blade in a blade radial direction, and wherein, as viewed from the side, a horizontal cross section including the lower end portion of the lowest upper agitation blade being arranged below a horizontal cross section including an upper end portion of the lower blade; and a lower end portion of the lower blade is arranged close to an inner bottom surface of the agitation vessel.