Patent ID: 8695162

Claim:
An electric blower comprising a stator, a rotor supported inside the stator in a rotatable manner around an output shaft, a bracket supporting the stator, a rotary fan mounted to one end of the output shaft in an axial direction thereof, an air guide disposed between the bracket and the rotary fan, and a fan case having an air inlet opening at a center of the fan case and covering the air guide and the rotary fan, wherein: the air guide comprises a partition plate disposed between the bracket and the rotary fan, a diffuser provided with a plurality of diffuser vanes and disposed around outer periphery of the rotary fan, wherein a closed flow path formed between the diffuser vanes, a diffuser shoulder comprising a rounded corner of a circular arc shape formed along an edge of the diffuser exit side of the closed flow path of the diffuser, a partition-plate sloped portion having a slope and in contact with a bottom surface of the diffuser, and a guide vane formed on the back side of the diffuser through the partition plate; the fan case comprises a fan-facing portion extending radially and facing the rotary fan, a fan case shoulder curved into an arc shape from an outermost part of the fan-facing portion toward the axial direction, and a cylindrical portion extending cylindrically in the axial direction from the shoulder; and the circular arc of the fan case shoulder has an area in the meridian plane less than or equal to one fourth of an area in the same meridian plane of the circular arc of the diffuser shoulder.