IMPELLER OF AXIAL-FLOW FAN

摘要

FIELD: supply of air. SUBSTANCE: impeller has hub with ferrule; swivel bases with pair of blades secured on them are mounted on axles in holes of ferrule. Blades are connected by means of pair of strips in upper and lower parts of interblade space at different angles relative to plane of swivel base. Tail-piece is rigidly secured on axle of blades. EFFECT: increased zone of operation of large fans at enhanced efficiency. 2 dwg