CENTRIFUGAL FAN (VERSIONS) Russian patent published in 2008 - IPC F04D17/08 F04D29/66 

FIELD: engines and pumps.

SUBSTANCE: proposed fan incorporates scroll case 1, impeller with blades 8 and cover plate 7, inlet manifold with cylindrical section, outlet branch pipe 5 equal to width L of case 1 and circular gap between the manifold and plat 7 surfaces. In compliance with the first version, vortex-arrester plate 12 with the height h_v=H_v/D)=10...0.16 is arranged on the manifold outer surface between the meridian planes passing through the line of a complete opening of case 1 shifted by 45° from the aforesaid plane towards the tongue. In compliance with the second version, plate 15 with the height h_"СП"=H_"СП"/D=10...0.14 is coupled with case 1 opposite blades 8 and between the meridian planes passing through the line of the maximum opening of case 1 and through the tongue nose.

EFFECT: higher pressure and efficiency.

12 cl, 14 dwg