US 12,312,077 B2
Ducted fan device and aircraft
Yuki Morisaki, Tokyo (JP); Masayuki Oda, Tokyo (JP); and Yasuhiro Saiki, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 18/289,177
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Feb. 14, 2022, PCT No. PCT/JP2022/005664
§ 371(c)(1), (2) Date Nov. 1, 2023,
PCT Pub. No. WO2022/239342, PCT Pub. Date Nov. 17, 2022.
Claims priority of application No. 2021-081076 (JP), filed on May 12, 2021.
Prior Publication US 2024/0409210 A1, Dec. 12, 2024
Int. Cl. B64C 29/00 (2006.01)
CPC B64C 29/0091 (2013.01) 11 Claims
OG exemplary drawing
 
1. A ducted fan device comprising:
fan devices each comprising:
a fan that rotates about a first axis and generates an airflow; and
a cylindrical smaller duct surrounding the fan about the first axis and extending in a first axis direction; and
a cylindrical larger duct extending in a second axis direction parallel to the first axis, wherein
each of the fan devices is disposed inside the larger duct when viewed in the second axis direction,
at least a part of the smaller duct is disposed outside the larger duct and upstream of the larger duct in a flow direction of the airflow when viewed in a direction orthogonal to the second axis direction, and
in the flow direction, a downstream end face of the smaller duct of each of the fan devices is disposed upstream with respect to an upstream end face of the larger duct.