US 12,331,752 B2
Blower and heat pump unit
Hiroki Andou, Osaka (JP); Takashi Ono, Osaka (JP); and Toshihiro Mori, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Feb. 22, 2022, as Appl. No. 17/677,819.
Application 17/677,819 is a continuation of application No. PCT/JP2020/031499, filed on Aug. 20, 2020.
Claims priority of application No. 2019-153797 (JP), filed on Aug. 26, 2019.
Prior Publication US 2022/0178382 A1, Jun. 9, 2022
Int. Cl. F04D 29/38 (2006.01); F04D 29/54 (2006.01); F04D 29/66 (2006.01)
CPC F04D 29/38 (2013.01) [F04D 29/54 (2013.01); F04D 29/66 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A blower comprising:
a propeller fan configured to rotate around a rotation axis, the propeller fan including a plurality of blades at unequal pitches; and
an enclosure housing the propeller fan, the enclosure including a bell mouth, and the enclosure having a depth L,
the bell mouth including a cylindrical part parallel to the rotation axis, and
the relationships

OG Complex Work Unit Math
and

OG Complex Work Unit Math
are satisfied,
H0 being a length of the blades in a rotation axis direction and H2 being a length of the cylindrical part being in the rotation axis direction.