FAN FOR LOCAL VENTILATION OF WELLS Russian patent published in 2014 - IPC E21F1/08 F04D19/02 

FIELD: mining.

SUBSTANCE: fan includes two basic modules of the first and the second stages adjacent to each other by a connection box-type insert so that each module includes a housing, an electric motor, an impeller installed immediately on the electric motor shaft. Impellers of the first and the second stages are made as per a counter-rotation scheme as all-welded impellers with non-rotational double plate blades of S-shape with a variable along the impeller radius by a geometry calculated by means of a single vortex method as jointly operating without any directing vanes based on minimum acoustic power (noise) of the fan, maximum efficiency, pressure and capacity.

EFFECT: creation of a fan for local ventilation of wells, which has improved aerodynamic characteristics and provides a possibility of a reversing operating mode at change of rotation direction of impellers and reduction of mass-and-dimensional characteristic of the fan.

10 dwg