US 9,810,239 B2
Electric blower
Ryosuke Hayamitsu, Kyoto (JP)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Filed by Nidec Corporation, Kyoto (JP)
Filed on Jun. 23, 2015, as Appl. No. 14/747,307.
Claims priority of application No. 2014-156607 (JP), filed on Jul. 31, 2014.
Prior Publication US 2016/0032938 A1, Feb. 4, 2016
Int. Cl. F04D 29/44 (2006.01); F04D 29/42 (2006.01); A47L 5/22 (2006.01); F04D 17/16 (2006.01); F04D 25/08 (2006.01); F04D 29/66 (2006.01); F04D 17/08 (2006.01); F04D 25/06 (2006.01); F04D 29/28 (2006.01); F04D 29/30 (2006.01)
CPC F04D 29/4253 (2013.01) [A47L 5/22 (2013.01); F04D 17/08 (2013.01); F04D 17/165 (2013.01); F04D 25/06 (2013.01); F04D 25/082 (2013.01); F04D 29/281 (2013.01); F04D 29/30 (2013.01); F04D 29/4206 (2013.01); F04D 29/444 (2013.01); F04D 29/667 (2013.01)] 12 Claims
OG exemplary drawing
 
1. 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.