| 摘要 |
An aeration-type rotary dryer injects air into or onto a flow of materials a rotating cylinder. The air is supplied to an air duct (21) axially passing through the cylinder (10) from the outlet box (11) to the inlet box (12). The axial duct (21) is composed of a plurality of longitudinally, successively connected tubular members (22, 23, 24) each nearer to the inlet box being smaller in diameter than other. The most inlet-sided member (24), located in a central opening (32) of an inlet partition (31) of the cylinder, has the smallest diameter, so that the inlet partition has the central opening reduced and its threshold height increased. This results that the materials are prevented from returning to the inlet box out of the cylinder. The most outlet-sided member (22), located in a central opening (34) of an outlet partition (33) of the cylinder, has the largest diameter, so that a void space in the central opening (34) may be too small to exhaust air. There is a remedy that air exhausts through the outlet partition (33) composed of a plurality of louvers (35) which are disposed at regular intervals on the inner periphery of the cylinder. This allows the dryer to double an amount of exhaust air as well as a drying capacity as compared with the conventional non-aeration type rotary dryer having the same size cylinder. <IMAGE> |
