Impeller assembly for dispersing solid in liquid utilizing curved baffle plate and solid-liquid mixing device using impeller assembly

An impeller assembly for a solid-liquid mixing device, the impeller assembly comprising an impeller body, a plurality of mixing blades which are evenly distributed being located on an inner side of the impeller body and extended outwards from a shaft of the impeller body, and at least two baffle plates being disposed on an outer side of the impeller body along a radial direction of the impeller body outwards and disposed in a circumferential direction of the impeller body, wherein one of every adjacent two baffle plates is fixedly connected to a cavity of the mixing device, an other of the every adjacent two baffle plates is fixedly connected to the impeller body, and at least one pair of adjacent two baffle plates satisfies following conditions:

• curves projected by two opposite surfaces of each of adjacent baffle plates on a cross section of the impeller at any height are smooth curves, and at least one of the curves is not fully included in a circle with a center of the shaft as its center;
• wherein
• the curves corresponding to the two opposite surfaces of the adjacent baffle plates on the cross section at any height are of corrugated structures which fluctuate periodically along the circumferential direction of the impeller body;
• a minimum size of the gap between the every adjacent two baffle plates is 1-5 mm;
• gaps between top ends of the baffle plates and corresponding surfaces of the cavity or the impeller body, and a gap between every adjacent two baffle plates form a bent passage configured for a suspension to flow from the inner side of the impeller body to the outer side of the impeller body;
• and
• a plurality of through holes or a plurality of through grooves are formed in baffle plates, and the through holes or through grooves, the gaps at the top ends of the baffle plates and the gap between the every adjacent two baffle plates form a bent passage configured for a suspension to flow from the inner side of the impeller body to the outer side of the impeller body.