COOLING TOWER FAN Russian patent published in 2017 - IPC F28G1/00 

FIELD: power industry.

SUBSTANCE: cooling tower fan includes a diffuser, body of which is made as a convergent-divergent shell from the glass material, on the outer surface of the body there are made intersecting stiffening ribs, and a bladed wheel is installed in the diffuser, which shaft is connected to the blade wheel rotary drive and disposed coaxially with the convergent-divergent shell, intersecting stiffening ribs are made hollow with a trapezoidal cross section and are arranged vertically and horizontally to form the cells between them, the convergent-divergent shell is formed as a body of revolution. The generatrices surfaces of the convergent-divergent shell parts are formed by the circle arc, gradually coupled with the cylindrical part generatrix, located between the generatrices of the convergent-divergent parts. The radius of the circle arc R₁ of the shell convergent part is from 0.32 to 0.40 of the shell height H₁, the radius of the circular arc R₂ of the shell divergent part is from 0.45 to 0.50 of the shell height H₁, the height H₂ of the cylindrical part is from 0.35 to 0.40 of the shell height H₁, the height H₃ of the convergent part is from 0.32 to 0.35 of the shell height H₁, the height H₄ of the divergent part is from 0.25 to 0.35 of H₁ the shell height, and the bladed wheel is located coaxially to the cylindrical part of the diffuser at the distance S from the diffuser shell inlet section of 0.45 to 0.5 from the shell height H₁, wherein the convergent-divergent shell is mounted on the support ring, fixed on the metal frame, made in the form of a regular polygon, and the blade wheel drive is mounted on the fixed, relatively, to the metal frame beams intersecting along the shell axis, wherein the drive motor is mounted on the one of the beams end, and the reducing gear, coupled with the input shaft to the motor shaft, mounted in the place of the beams intersection at the reducing gear output shaft, coaxial with the axis of the shell, the cooling tower fan impeller is installed.

EFFECT: aerodynamic drag reduction of the cooling tower fan diffuser flowing part, while maintaining the required stiffness of the diffusor structure.

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