The KS frame impeller is a low-speed radial flow impeller. Stirring is mainly characterized by horizontal annular flow, and the horizontal and vertical bars at different positions can increase the eddy current near the blades and expand the stirring range. It generally operates under laminar flow conditions and is suitable for low-viscosity liquid levels with arbitrary changes or mixing, heat transfer, dissolution, non-uniform mass transfer, and reaction unit operations of medium and high viscosity.