CENTRIFUGAL FAN IMPELLER Russian patent published in 2020 - IPC F04D29/28 

FIELD: ventilation.

SUBSTANCE: invention can be used in centrifugal fan impellers. Centrifugal fan impeller comprises a central disc, curvilinear blades covering the conical and stiffness rings. Diameter of input of impeller D₁ = 0.52D₂, where D₂ is external diameter of impeller, width of blade at outlet b₂ = 0.081D₂, number of blades is within 12–14. Blade input angle β₁ = 41°; outlet angle β₂ = 50–52°; inclination angle of covering disc α = 8–11°, wheel width b = 0.162D₂; inlet section of blade is made along arc of circle with blade radius R_l = 0.448 D₂ and centre on circle with radius R_c = 0.295D₂, concentric circle D₂. Maximum deflection of the blade f_max = 0.037D₂, the length of the blade section from its inlet edge ν to the point of its maximum deflection makes 0.177D₂.

EFFECT: technical result is higher efficiency, simplified impeller, increased service life of impeller.

1 cl, 3 dwg