Patent ID: 7850105
Filing Date: 2010-12-14
Classification: B02C

Abstract:
1. A jet mill in which crushed material introduced into a crushing chamber is comminuted by gas being sprayed from a plurality of gas-jet nozzles disposed along an internal perimeter wall of the crushing chamber, wherein the direction in which the gas is sprayed into the crushing chamber is variably adjustable, the gas-jet nozzles are inserted in a through-hole formed in the housing of the crushing chamber in a state allowing unrestricted movement in a radial direction, and are pivotally supported in the through-hole by a movable bearing that allows the gas jet nozzles to be directionally adjustable, the movable bearing is a spherical bearing; a seal part for plugging the through-hole is formed, a concave groove is formed in an annular shape along a sliding surface of the spherical bearing; and a pressurized gas is introduced into the annular concave groove.