Electric blower
AssigneeNidec Corporation
InventorRyosuke Hayamitsu
Life of this patent
Estimating the term…
Abstract
An electric blower includes a centrifugal impeller, a diffuser including stationary vanes on a discharge side of the centrifugal impeller, a motor configured to drive the centrifugal impeller, a fan case configured to cover the centrifugal impeller and the diffuser, a housing case joined to the fan case, and return guide vanes that guide air which has been guided by the stationary vanes to an inner surface of the fan case radially inward through a space under the diffuser. The housing case includes an annular lower plate portion located axially below the diffuser. Each return guide vane is continuous with an upper surface of the annular lower plate portion. An upper end of each return guide vane is located axially opposite to the diffuser.
Claims12
An electric blower comprising:
- a centrifugal impeller that rotates about a central axis extending in a vertical direction;
- a diffuser including a plurality of stationary vanes located on a radially outer side of the centrifugal impeller;
- a motor that drives the centrifugal impeller;
- a fan case that covers the centrifugal impeller and the diffuser, and including an inlet port located axially opposite to a central portion of an upper surface of the centrifugal impeller;
- a housing case located radially outside of the motor, and joined to the fan case;
- and
- a plurality of return guide vanes each of which guides air which has been guided by each of the plurality of stationary vanes of the diffuser to an inner surface of the fan case radially inward through a space under the diffuser;
- wherein
- the housing case includes an annular lower plate portion located axially below the diffuser;
- each of the plurality of return guide vanes is continuous with an upper surface of the annular lower plate portion;
- an upper end of each of the plurality of return guide vanes is located axially opposite to the diffuser;
- and
- at least a partial portion of each of the plurality of the return guide vanes are axially aligned with the plurality of stationary vanes in the vertical direction.
Dependencies are inferred from the claim text.