US 11,808,282 B1
Propeller fan assembly with silencer seeds and concentric hub and method of use
Chaitanya Johar, Tulsa, OK (US); Brent Stockton, Broken Arrow, OK (US); Rudy Powell, Skiatook, OK (US); and Ariel Leff, Tulsa, OK (US)
Assigned to AAON, Inc., Tulsa, OK (US)
Filed by AAON, Inc., Tulsa, OK (US)
Filed on Mar. 2, 2022, as Appl. No. 17/684,933.
Int. Cl. F04D 29/66 (2006.01); F04D 29/64 (2006.01); F04D 19/00 (2006.01)
CPC F04D 29/661 (2013.01) [F04D 19/002 (2013.01); F04D 29/644 (2013.01)] 41 Claims
OG exemplary drawing
 
1. A propeller fan for a heating, ventilation and air conditioning (HVAC) unit, the propeller fan comprising:
a plurality of blades arranged in a concentric configuration, each of the plurality of blades comprising a leading edge, trailing edge, a suction side and a discharge side; and
a plurality of protrusions P configured on the suction side proximate the leading edge of at least one of the plurality of blades;
wherein the plurality of protrusions lowers sound pressure levels generated during operation of the propeller fan.