AXIAL-FLOW FAN Russian patent published in 2003 - IPC

FIELD: mechanical engineering; fans and ventilators. SUBSTANCE: invention can be used in main ventilation plants of mines and under ground railways. Proposed axial-flow fan contains housing with rotor with impeller installed in housing on bearing supports, collector-fairing, diffuser, straightening and guide vane assemblies whose vanes are rigidly secured between outer and inner shells of housing and are provided with mirror bosses. Impeller is furnished with two sets of interchangeable blades with mirror bosses relative to plane passing through axis of blade turning square to impeller axis. Invention makes it possible to reduced cost and increase economy owing to use of housing of one type and two interchangeable sets of impeller blades for delivery and suction. EFFECT: improved ventilation, reduced cost. 2 cl, 3 dwg