EXHAUST FAN Russian patent published in 2006 - IPC F04D17/10 

FIELD: mechanical engineering; fans and ventilators.

SUBSTANCE: proposed fan contains cylindrical casing 6, intake hole 8 connected with smaller diameter coaxial cylindrical channel, electric motor installed coaxially in casing 6 and having diameter smaller than that of casing and on shaft of which impeller 13 is secured consisting of blades 14 of such shape that all cross sections of blades by planes parallel to axis of casing are parallel to said axis, and blades 19 directing air flow made integral with inner surface of casing 6 and distributed over its periphery. Each blade 19 has at least one curvilinear part 19a found from side of intake hole of casing in ring space between casing 6 and imaginary cylindrical surface being extension of hole 8 for air intake.

EFFECT: provision of plant operating from draught pressure caused by wind and heat circulation.

5 cl, 4 dwg