Patent ID: 7134621

Claim:
A mixing apparatus comprising a plurality of mixing units piled up in a housing having an inlet, a mixing space and an outlet, the mixing units are relatively rotated by a motor, and have arrays of projections formed and arrayed along the circumferential direction in a predetermined space, the arrays of the projections located alternately in order to form concentric circles not interfered with each other; wherein said respective mixing units are formed with first and second pairs of upper and lower disks which are parallel arrayed in a predetermined space, the arrays of the projections are formed on the outer surface of the pairs of disks, fluid passages are formed between the upper and lower disks of each pair, a predetermined space is formed between the outer surface of the lower disks of each pair directed to the inlet of the housing and inner surface of the housing so that inflow passages opening to the fluid passages are formed between the lower disks and the housing, outflow passages opening to the fluid passages are formed at the inner surface of the upper disks of each pair directed to the outlet of the housing, and the mixing units are attachable in multiple layers; wherein both sides of the projections of said mixing units are formed with concave curve surfaces; wherein the surfaces are concave in the direction of the plane of the mixing units and are curved such that the concave curve surfaces form a curved fluid path in at least the direction of fluid flow; wherein a plurality of mixing units are divided into a rotation unit and a fixing unit, a combination hole is formed at the center of the rotation unit, a shaft of the motor is inserted into the combination hole, the fixing unit is fixed to the inner surface of the housing, and an insertion hole is formed at the center of the fixing unit and the shaft is slidably combined in the insertion hole.