PNEUMATIC SEPARATING APPARATUS OF GRAIN CLEANING MACHINE Russian patent published in 2000 - IPC

FIELD: agriculture. SUBSTANCE: apparatus has pneumatic separating systems with settling chambers, pneumatic separating and air supply channels. Fan with suction window and suction branch pipe is disposed between pneumatic separating systems. Suction branch pipe is connected to pneumatic separating channel of primary aspiration system and is communicated via auxiliary channel to air supply channel of secondary aspiration system in zone where purified air is discharged from settling chamber of primary aspiration system. Fan suction window is connected via bypass channel to settling chamber of secondary aspiration system and via air exit channel to device for discharge of grain from primary aspiration system. Regulating gates are positioned at auxiliary channel and secondary aspiration system communication zone and in fan suction window for providing optimum air flow rate in pneumatic separating channels. EFFECT: increased efficiency by improved grain cleaning quality and simplified construction. 1 dwg