The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2025
Filed:
Feb. 21, 2022
Mitsubishi Electric Corporation, Tokyo, JP;
Kisho Hatakenaka, Tokyo, JP;
Tomoya Fukui, Tokyo, JP;
Kenichi Sakoda, Tokyo, JP;
Tetsuji Saikusa, Tokyo, JP;
Yuki Nakao, Tokyo, JP;
MITSUBISHI ELECTRIC CORPORATION, Tokyo, JP;
Abstract
An impeller includes a blade including, at its leading edge part, a first leading-edge-side concavity, a leading-edge-side convexity, and a second leading-edge-side concavity, which are positioned in sequence from a radially middle part to an outboard edge part. The first leading-edge-side concavity is a part where the suction side of the impeller is concave. The leading-edge-side convexity is a part where the suction side is convex. The second leading-edge-side concavity is a part where the suction side is concave. At the leading edge part of the blade, the blade has a blade height defined in a direction along the rotational axis of the impeller toward the suction side. The blade height decreases monotonically from the radially middle part toward a first leading-edge-side stationary point, and increases monotonically from the first leading-edge-side stationary point toward a second leading-edge-side inflection point.