The invention relates to an improved centrifugal type wind wheel as well as a
volute and a
turbine fan
assembly. The wind wheel comprises a bottom plate, multiple blades and a
stirrup, wherein the multiple blades are distributed on the bottom plate at intervals, the
stirrup is connected with the multiple blades, and the multiple blades and the bottom plate form a negative pressure region; the envisaging projection shape of each blade is a right angle trapezoid, the sloping side of each blade faces to the negative pressure region, the width of the top side of each blade is less than that of the bottom side of each blade, and the connecting part of the top side and the sloping side of each blade is provided with a half-baked groove; the
centrifuge wind wheel provided by the invention has the characteristics of large air quantity, small noises, low cost,
high energy efficiency and the like as compared with the
centrifuge wind wheel in the same specification; and the
volute is provided with an edgefold stretching into the half-baked groove of the wind wheel, the
volute and the edgefold are connected in a match manner so as to be capable of effectively preventing gas from flowing back to an air inlet, and increase the inlet air area effectively, and meanwhile, the air pressure generated by the wind wheel is prevented from counteraction on the incoming air from the air inlet so as to counteract part of air input. If a motor is same, the
diameter and height of the wind wheel and the torsion angle of the blades are same, and an air duct
system is same, the air quantity of the centrifugal type wind wheel provided by the invention can be improved by more than 20%.