CENTRIFUGAL SUPERCHARGER IMPELLER Russian patent published in 2001 - IPC

FIELD: mechanical engineering; centrifugal compressor machines. SUBSTANCE: centrifugal supercharger impeller includes open diffuser and lateral sectional chamber, cover disc, straight blades and axial inlet. Inlet angle β₁ is equal to 40-45 deg, relative width at outlet b₂/D₂ ranges from 0.05 to 0.065; relative inlet diameter D₁/D₂ is 0.47-0.5; angle of inclination of cover disc γ = 9-12 deg; number of blades from 14 to 17. Impeller blades have smoothly increasing angles of inclination from D/D₂ = 64-67 deg to β = 85-90 deg of outlet diameter beginning with relative diameters β₂; b₂ is width of impeller at outlet; D₂ is outer diameter of impeller; D₁ is inlet diameter of impeller and D is diameter of beginning of smooth increase of angle of inclination of blades. EFFECT: enhanced steepness of pressure characteristic at maximum approximation to characteristic obtained at outlet angle of blades up to 90 deg, single-radius blades and concave part directed towards rotation (at retained efficiency typical for impellers with straight blades). 2 dwg