Patent ID: 6196482
Filing Date: 2001-03-06
Classification: B02C

Abstract:
A jet mill of a horizontal turning flow type, comprising a hollow disk-shaped turning and crushing chamber; a plurality (""m"") of crushing nozzles, having an jetting port inclined to a circumferential wall side and disposed at a side wall of said turning and crushing chamber, which forms turning flows by jetting a high pressure gas; a plurality (""n"") of venturi nozzles (however, m+n=a, a is an integral number, and m>n) for introducing materials to be crushed, in line with the high pressure gas, which are disposed at the side wall of said turning and crushing chamber; a solid and gas blending chamber, which is formed at the upstream side of said venturi nozzles; a crushed material supplying portion communicating with said solid and gas blending chamber; a press-in nozzle disposed in said solid and gas blending chamber coaxially with said venturi nozzles; and an outlet, disposed at the upper part of the center portion of said turning and crushing chamber, which discharges micro powder, wherein a distance 1 between a venturi nozzle lead-in portion of said solid and gas blending chamber and the discharge side of said press-in nozzle is expressed in terms of 1=(D/d).times.k, a value k is k=7 through 12 (where D is the diameter of the venturi nozzle lead-in portion, and d is the diameter of the press-in nozzle at the discharge side).