PURPOSE: To increase the torque of an air turbine in the suction port part of the vacuum cleaner, and to reduce a noise of the air turbine by improving a vane shape of an impeller.
CONSTITUTION: In the suction port part of the vacuum cleaner, an impeller 2a is provided, and the impeller 2a is divided into the right side impeller and the left side impeller, and each impeller is shifted and attached alternately in the peripheral direction. Also, in the outside peripheral part of a vane on the end part side in the axial direction of the impeller 2a, an auxiliary vane 2b is attached. Since the auxiliary blade is attached to the outside peripheral surface of the vane of the right side impeller and the left side impeller, an outflow angle of a relative flow becomes small, the torque of an air turbine increases by 20% from conventional one, a jet flow velocity is decelerated by a torque increase portion, and a noise of the air turbine is reduced.
YAMAZAKI SUSUMU
MIKAMI KATSUMASA
YAMAMOTO WATARU
NAKAGAWA KOJI
