EP 0408221 B1 19940907 - DC motor driven centrifugal fan.
Title (en)
DC motor driven centrifugal fan.
Title (de)
Gleichstrommotorgetriebener Zentrifugalventilator.
Title (fr)
Ventilateur centrifuge entrainé par un moteur à courant continu.
Publication
Application
Priority
GB 8916214 A 19890714
Abstract (en)
[origin: EP0408221A2] A centrifugal fan includes a brushless d.c motor (50), an impeller (60) mounted on the motor and a scroll (70) on which the motor is mounted. The scroll defines the air inlet and outlet (73) and has an outer wall (71) curved around the impeller to define a divergent air flow path. By truncating the scroll at the outlet substantially to eliminate any flat portions on the outer wall susceptible to mechanical vibrations at frequencies excited by the d.c motor, a noise reduction is achieved. Further noise reduction may be achieved by resiliently mounting the motor on the scroll.
IPC 1-7
IPC 8 full level
F04D 25/08 (2006.01); F04D 29/42 (2006.01); F04D 29/66 (2006.01); H02K 5/24 (2006.01)
CPC (source: EP)
F04D 29/424 (2013.01); F04D 29/668 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0408221 A2 19910116; EP 0408221 A3 19910424; EP 0408221 B1 19940907; DE 69012244 D1 19941013; DE 69012244 T2 19950330; GB 2234012 A 19910123; GB 8916214 D0 19890831; JP H0350398 A 19910304
DOCDB simple family (application)
EP 90307116 A 19900628; DE 69012244 T 19900628; GB 8916214 A 19890714; JP 18289790 A 19900712