PNEUMATIC CONVEYING DEVICE

摘要

Apparatus for conveying solid particulate material including a casing having bore therethrough and an inlet for material to be conveyed and an outlet. A screw impeller is rotatably mounted in the casing by front and rear bearings with the rear bearing being near the inlet. The outlet is intermediate the inlet and the forward bearing. A discharge chamber is flow connected immediately adjacent the casing outlet. Nozzles for supplying gas under pressure are provided in the discharge chamber for discharging material from the discharge chamber into and through a pneumatic conveying line. The screw impeller includes a feed screw section which terminates adjacent the casing outlet and a reversing section with reverse flights between the forward bearing and the casing outlet to prevent material from entering the forward bearing. A restriction plate may be placed in the casing outlet to reduce the size of the outlet opening to less than the bore through the casing. A flap valve is provided which swings away from the casing outlet and discharge chamber inlet for establishing an initial material seal.