Micropulverizer
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsTatsuo Hagiwara, Shozi Nagano
Life of this patent
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Abstract
In a pulverizer of the type having, within a casing, a stator and a rotor to be rotated in the stator, both having large numbers of mutually confronting ridges or teeth with a gap therebetween, the gap is 1 mm or less, and the ridges of the stator are of sawtooth shape as viewed in cross section and have flanks forming troughs therebetween with an acute bottom dihedral angle of 45 to 60 degrees. At least one tier of a classification ring is provided around the inner wall surface of the stator to form flow-blocking barriers across some or all of the troughs thereby to prevent particles being pulverized from being swept through the troughs without being satisfactorily pulverized.
Claims15
In a pulverizer comprising a generally cylindrical vertically extending casing with a vertically extending axis, a top and a bottom, having at the bottom thereof a feed inlet for particles to be pulverized and air conveying the particles and having at the top thereof a pulverized product discharge outlet, a rotor having a generally cylindrical outer surface and being rotatably supported within the casing by a vertically extending rotating shaft having an axis, said rotor having along generatrices of said outer surface thereof a large number of vertical ridges, and a stator provided around an inner wall surface of the casing and having along generatrices of said inner wall surface a large number of vertically extending ridges confronting the ridges of the rotor with a gap between said ridges of said stator and said ridges of said rotor, said ridges of the stator making relative movement with respect to said ridges of said rotor as said rotor is rotated around said rotating shaft, the improvement wherein:
- said gap is no greater than 1 mm;
- said ridges of said stator are of sawtooth shape as viewed in cross section, each ridge of said stator having a leading flank and a trailing flank with respect to the relative movement between said rotor and said stator so that said trailing flank of one ridge of said stator is opposite to said leading flank of a ridge immediatley adjoining said one ridge in the direction of said relative movement, said trailing flank lying in a vertical extending plane passing substantially through said axis of said shaft and forms an acute dihedral angle of 45 to 60 degrees with the opposite leading flank of said immediately adjoining ridge, thereby defining a trough of triangular cross section between said trailing flank of said one ridge and said leading flank of said immediately adjoining ridge, said leading flank lying in a vertically extending plane that is substantially tangential to said outer surface of said rotor;
- and
- at least one tier of a classification ring provided around said inner wall surface of said stator forming flow-blocking barriers across at least some of said troughs.
Dependencies are inferred from the claim text.