PNEUMOCLASSIFIER Russian patent published in 1996 - IPC

FIELD: agricultural mechanical engineering. SUBSTANCE: pneumoclassifier includes charging fixture and sections mounted one after another. Each of them is made of vertical aspiration channel whose upper part is in communication with precipitating chamber. By overflow window the chamber is in communication with the middle part of vertical aspiration channel of following section. Pneumoclassifier also has branch pipes with shields. In addition to its main vertical channel mounted between charging fixture and aspiration channel of the first section and communicating with precipitating chamber of the last section by means of horizontal air duct encompassing in overhead part intermediate vertical aspiration channels with their precipitating chambers. The overflow window is made in the form of branch pipe-T-joint one output of which is in communication with precipitating chamber through window formed between lower edge of slide plane of precipitating chamber and the plane of dividing wall of vertical aspiration channel of the following section. The second output of branch pipe-T-joint is in communication with vertical channel of following section. The third output is in communication with atmosphere. Throttle valve is mounted in branch pipe from air intake side. Together with the plane of dividing wall of aspiration channel the throttle valve forms outlet channel in branch pipe. The cross-section of output part of window on dividing wall of channel is more than cross-section of throttling window which in its turn is more than cross-section of input part of overflow window near the foundation of precipitating chamber. Output parts of discharging aspiration channel and, conjugated with it aspiration channel of initial section are disposed lower than corresponding output parts of channels of the remaining sections. EFFECT: enhanced efficiency. 2 cl, 2 dwg