US 4,296,864 A · Air classifier

Abstract

An air classifier comprises a casing formed of a generally hollow cylindrical vertical casing body and an inverted conical hopper fixed to the lower wall of the casing body. A fine product outlet duct is provided at the center of the upper wall of the casing body. An air-powdered material inlet duct and a secondary air inlet duct are set in the diametrically opposite positions of the vertical wall of the casing body to project tangentially outward. A vertical rotary shaft extends through the central portion of the casing body. A rotary disc member for concurrently carrying out the dispersion and classification of a powder raw material is fitted to the lower end of the rotary shaft at a boundary between the casing body and hopper. A cage-shaped assembly of guide vanes is provided in the casing body to conduct a mixture of air and powdered material into the casing body. The air classifier of this invention constructed as described above can precisely classify by itself a large amount of powder material as a classifier for swept-air from a mill.

Claims31

Dependent claims

An air classifier which comprises:

a casing formed of a generally hollow cylindrical vertical casing body and a hopper fitted to the lower end of said casing body;
a fine product outlet duct set at the center of the upper end wall of the casing body;
an air-powder raw material inlet duct tangentially projecting outward from the casing body;
a rotary shaft concentrically extending through the casing body;
a rotary disc member concentrically fixed in the casing body and set at a boundary between the casing body and the hopper to concurrently carry out the dispersion and classification of a powdered material;
and
guide vanes provided in the casing body in a state equidistantly spaced from each other in the circumferential direction of said casing body to conduct a mixture of air and a powder raw material into said casing.

4 more elements

An air classifier which comprises:

a casing formed of a generally hollow cylindrical vertical casing body and a hopper fitted to the lower end of said casing body;
a fine product outlet duct set at the center of one of horizontal end walls of the casing body;
an air-powder raw material inlet duct tangentially projecting outward from the casing body;
a rotary shaft concentrically extending through the casing body;
a rotary disc member concentrically fixed in the casing body to concurrently carry out the dispersion and classification of a powder material, said rotary disc member provided with at least one opening through which the fine product outlet duct communicates with the casing body said fine product outlet duct extending downward from the rotary disc member a concentric relationship therewith to project out of the hopper;
guide vanes provided in the casing body in a state equidistantly spaced from each other in the circumferential direction of said casing body to conduct a mixture of air and a powder raw material into said casing;
vortical flow-adjusting blades mounted on the rotary disc member in the casing body in a state set in parallel with the rotary shaft and substantially equidistantly spaced from each other in the circumferential direction of the rotary disc member;
a powered material inlet duct provided at the center of the upper wall of the casing body;
and
a disc-like horizontal dispersion member fixed to the upper ends of the vortical flow-adjusting blades concentrically with the rotary shaft.

7 more elements

Dependencies are inferred from the claim text.

Air classifier

Life of this patent

Air classifier

Life of this patent

Abstract

Claims31