VACUUM DUST REMOVAL APPARATUS HEAD Russian patent published in 1995 - IPC

FIELD: ventilation-and-draft systems for cleaning premises and streets. SUBSTANCE: head has suction channel defined by side and two front surfaces. Slit-type entrance end of channel is smoothly changed into round-section branch pipe. Front surfaces of head channel extending from slit-type entrance end to suction branch pipe are defined by geodesic lines orthogonal with respect to larger side of slit-type entrance end of channel and to connection border line between front surfaces and suction branch pipe. Cross section of head channel is made constant or reducing in the direction of suction branch pipe. Movable supporting strip is mounted in slit-type entrance end of head channel along its length on axis extending parallel to larger side of entrance end. EFFECT: increased efficiency and wider operational capabilities. 4 cl, 5 dwg