公开(公告)号：US20230141673A1

公开(公告)日：2023-05-11

申请号：US18152861

申请日：2023-01-11

Applicant: DENSO CORPORATION

Inventor： Fumiya ISHII ,  Syuzou Oda ,  Syoichi Imahigashi

IPC: F04D29/32 ,  F04D29/28 ,  F04D29/38

CPC classification number: F04D29/326 ,  F04D29/281 ,  F04D29/384

Abstract: Each of a plurality of blades of a turbofan includes a thick wall portion, a thin wall portion and a stepped portion. The stepped portion is formed between the thick wall portion and the thin wall portion. A plate thickness of the stepped portion is progressively decreased toward a positive pressure surface of the blade in a direction that is directed from the thick wall portion toward the thin wall portion. In the blade, a first curved surface forms a negative pressure surface of the thick wall portion, and a second curved surface forms a negative pressure surface of the thin wall portion while the second curved surface is located on a side of the first curved surface where the positive pressure surface of the blade is placed, and a negative pressure surface of the stepped portion connects between the first curved surface and the second curved surface.

公开(公告)号：US12025148B2

公开(公告)日：2024-07-02

申请号：US18152861

申请日：2023-01-11

Applicant: DENSO CORPORATION

Inventor： Fumiya Ishii ,  Syuzou Oda ,  Syoichi Imahigashi

IPC: F04D29/32 ,  F04D29/28 ,  F04D29/38

CPC classification number: F04D29/326 ,  F04D29/281 ,  F04D29/384

Abstract: Each of a plurality of blades of a turbofan includes a thick wall portion, a thin wall portion and a stepped portion. The stepped portion is formed between the thick wall portion and the thin wall portion. A plate thickness of the stepped portion is progressively decreased toward a positive pressure surface of the blade in a direction that is directed from the thick wall portion toward the thin wall portion. In the blade, a first curved surface forms a negative pressure surface of the thick wall portion, and a second curved surface forms a negative pressure surface of the thin wall portion while the second curved surface is located on a side of the first curved surface where the positive pressure surface of the blade is placed, and a negative pressure surface of the stepped portion connects between the first curved surface and the second curved surface.