公开(公告)号：US10184490B2

公开(公告)日：2019-01-22

申请号：US15043178

申请日：2016-02-12

Applicant: Johnson Electric S.A.

Inventor： Chuan Hui Fang ,  Ming Ju Chen ,  Hong Guang Li

IPC: F04D29/66 ,  F04D29/54 ,  F04D29/32 ,  F04D17/16 ,  F04D25/06

Abstract: A noise reduction diffuser for an electric blower has a motor holder and a rear cover fitted to the motor holder. The motor holder includes a sidewall and a bottom portion at one end of the sidewall. The other end of the sidewall has an opening for mounting an electric motor inside the sidewall. An output shaft of the motor extends through the bottom portion for driving a fan. The motor holder and the rear cover form a Helmholtz resonance cavity.

公开(公告)号：US10605264B2

公开(公告)日：2020-03-31

申请号：US15240324

申请日：2016-08-18

Applicant: Johnson Electric S.A.

Inventor： Chuan Hui Fang ,  Feng Xue ,  Hong Guang Li ,  Huan He

IPC: F04D29/44 ,  F04D29/28 ,  F04D25/08 ,  F04D29/42 ,  F04D17/16

Abstract: A diffuser, an airflow generating apparatus, and an electrical device are provided. The airflow generating apparatus includes a motor; an impeller including blades with air passages formed therebetween; and a diffuser including diffusing vanes with diffusing channels formed therebetween. In a flow region defined between a terminating end of one diffusing vane and a starting end of another adjacent diffusing vane, an intersection line between a bottom of the diffusing channel between the two diffusing vanes and its circumferential section includes a front arcuate line segment and a subsequent straight line segment, the arcuate line segment extends curvedly, outwardly and downwardly from or from adjacent an inlet end of the diffusing channel, the straight line segment connects to the arcuate line segment and extends to an outlet end of the diffusing channel. The diffusing channel is designed to improve the operating efficiency of the airflow generating apparatus.