公开(公告)号：US10309422B2

公开(公告)日：2019-06-04

申请号：US15112706

申请日：2015-02-20

Applicant: DENSO CORPORATION

Inventor： Toshikatsu Kondou ,  Masashi Matsukawa ,  Youhei Kamiya ,  Masaru Kamiya ,  Takeshi Miyamoto ,  Isao Kondoh ,  Takashi Ito ,  Kazuhiro Takeuchi

IPC: F04D29/52 ,  F04D29/66 ,  F04D29/16 ,  B60H1/00 ,  F04D25/08 ,  F04D29/54 ,  F04D19/00 ,  F04D29/32

Abstract: A blower fan includes a plurality of blades radially extending from a boss provided at the rotary center and spaced apart from each other in the rotational direction, and a ring portion connecting outer peripheral ends of the blades in a ring shape. An inner peripheral wall surface of an end part on an air-flow downstream side of a cylindrical portion is disposed on the outside in a radial direction of the rotary shaft in the blower fan, with respect to an end part on the air-flow downstream side of the ring portion. The end part on the air-flow downstream side of the cylindrical portion is positioned outward in the radial direction of the rotary shaft, as toward the air-flow downstream side. Thus, the blower can prevent the backflow air from being swirled, thereby reducing noise.