公开(公告)号：US20220372990A1

公开(公告)日：2022-11-24

申请号：US17771056

申请日：2019-12-23

Applicant: Mitsubishi Electric Corporation

Inventor： Takuya TERAMOTO ,  Hiroyasu HAYASHI ,  Ryo HORIE ,  Takashi YAMAGUCHI ,  Tomohiro NAGANO ,  Kazuya MICHIKAMI ,  Takahiro YAMATANI ,  Hiroshi TSUTSUMI

IPC: F04D29/28 ,  F04D29/30

Abstract: An impeller includes a main plate, an annular side plate and blades. The blades each have: an inner circumferential end; an outer circumferential end; a sirocco blade portion formed as a forward-swept blade portion, and having an outlet angle that is greater than 90 degrees; and a turbo blade portion formed as a swept-back blade portion and including the inner circumferential end. The blades include a first blade portion and a second blade portion that are provided on respective sides of the main plate. The impeller including a region in which a first inter-blade distance is greater than a second inter-blade distance, where an inlet-blade distance is a distance between any adjacent two of the blades in the circumferential direction, the first inter-blade distance is the inter-blade distance of the first blade portion, and the second inter-blade distance is the inter-blade distance of the second blade portion.