The invention relates to a centrifugal fan impeller, comprising an edge plate, multiple vanes and an inner plate. The hub is fixed on the inner plate by nut and bolt. It is characterized in that the diameter of diffusion edge of impeller without vanes D is from 278mm to 1414mm; the diameter of impeller D1 is from 253mm to 1263mm; the diameter of impeller inlet D2 is from 167mm to 834mm; the total width of impeller B is from 115mm to 575mm; the width of impeller outlet b is from 77mm to 384mm; the angle of impeller outlet alpha is from 28 degrees to 33 degrees; the number of vanes N is 8. The invention finds the optimal matching relationship of the diameter of diffusion edge of impeller without vanes D, the diameter of impeller D1, the diameter of impeller inlet D2, the total width of impeller B, the width of impeller outlet b, the angle of impeller outlet alpha and the number of vanes N. It is provided with ease production, low cost and the no-shell centrifugal fan with the impeller is provided with long service life. The efficiency is improved by 3% compared with prior centrifugal fan. |