Cyclone for measuring and controlling amount of suspended dust

Abstract

Disclosed is a multiple-stage cyclone including a double-stage cyclone and a triple-stage cyclone. The triple-stage cyclone comprises an outer cylindrical body having an upper end which is closed by an upper plate and a lower portion which is formed as a downward converging pipe, the outer cylindrical body possessing an air inlet which is defined on a circumferential outer surface thereof adjoining the upper end; a first inner cylindrical body secured to an inner surface of the upper plate and having an upper portion which is formed as an upward converging pipe, the first inner cylindrical body being arranged inside the outer cylindrical body in a manner such that a first cylindrical space exists therebetween; a second inner cylindrical body secured to the downward converging pipe and having an upper portion which is inserted into the first inner cylindrical body in a manner such that a second cylindrical space exists therebetween; and a discharge pipe having a lower portion which is inserted into the second inner cylindrical body in a manner such that a third cylindrical space exists therebetween and an upper end which is fastened to the upper plate in a manner such that the upper end of the discharge pipe projects upward through the upper plate, the discharge pipe defining an air outlet.