To increase the efficiency of an electric air blower, i.e., the suction work done of a cleaner and at the same time, realize cost reduction and miniaturization/weight reduction by setting the coefficient of discharge and the specific rate to a specific range for the electric air blower incorporated in a vacuum cleaner.
A vacuum cleaner equipped with an electric air blower consisting of a motor and a centrifugal impeller in the main body of the vacuum cleaner, uses such an electric air blower that the coefficient of discharge e sought by formula e=Q/(60.π.D2.b2.u2) falls within the range of 0.03-0.05, and also the specific rate Ns sought by formula Ns=(N.Q0.5.H-0.75) is set to the range of 140-180. In this case, Q is air capacity (m3/min), D is the configuration (m) of a centrifugal impeller, b2 is the exit width (m) of the centrifugal impeller, u2 is the convergence (m/min) of the outer periphery of the impeller, N is rotational frequency (r/min) and H is head (m). Power consumption in the maximum air capacity zone of the electric air blower should preferably be about 1K(k).
IWASE KOJI
JORAKU FUMIO
TOYOSHIMA HISANORI
NAKAI TAKAHIRO
TAWARA KAZUO
ABE TAKASHI
