| 摘要 |
PURPOSE:To enable discharging direction to be changed in either case of forward and backward rotation by providing two centrifugal type impellers to have same inflow direction and an axial type impeller between both impellers. CONSTITUTION:Two centrifugal type impellers 21, 22 and an axial type impeller 25 are provided for the identical intake direction so that the inflow direction of air flow is identical. Air charged from a new charge port 36 in the forward rotation of a reversible motor 28 is forcibly sent to a discharge port by the impeller 21 and air flow from the impeller 22 in the backward rotation is sent to the impeller 22 by the action of the impeller 25. Thus, the discharging direction can be changed only by changing the rotational direction of the motor without reducing the efficiency of impeller.
|
