BLOWING DEVICE AND CLEANER

WIPO Patent Application WO/2017/082222

A1

The blowing device according to an exemplary embodiment of the present invention comprises: a motor that has a shaft that is arranged along a center axis that extends up and down; an impeller that is fixed to the shaft; and an impeller cover that surrounds an upper side and the radial-direction outside of the impeller and that has an intake port in the center thereof. The impeller has: a plurality of rotor blades that are arranged in the circumferential direction; a lower shroud that is arranged below the rotor blades; and an upper shroud that is arranged above the rotor blades and that has a through hole that passes therethrough in the axial direction. The upper shroud has: a first convexity that protrudes upward from an upper surface of the upper shroud and that extends in the circumferential direction; and a second convexity that is arranged further to the radial-direction outside than the first convexity, that protrudes upward from the upper surface of the upper shroud, and that extends in the circumferential direction. The radial-direction gap between a lower surface of the impeller cover and the first convexity and/or the second convexity is narrower than the radial-direction gap between the lower surface of the impeller cover and the portion of the upper shroud that is further to the radial direction inside than the first convexity.

HAYAMITSU RYOSUKE (JP)
MIYAMOTO YUZO (JP)
UEDA SATOSHI (JP)

PCT/JP2016/083017

May 18, 2017

November 08, 2016

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NIDEC CORP (JP)

F04D29/16; A47L9/00; F04D29/28; F04D29/62

JP2012154278A	2012-08-16
JP2012229657A	2012-11-22
JP2010038027A	2010-02-18
JP2015108369A	2015-06-11
JPH08109897A	1996-04-30
JPS5332406A	1978-03-27

See also references of EP 3376046A4

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