MULTI-STAGE CENTRIFUGAL FAN

摘要

A multi−stage centrifugal fan capable of providing a high static pressure exhaust, comprising a plurality of rotors (19a) to (19c) and chambers (20a) to (20c), wherein the plurality of rotors (19a) to (19c) having the chambers (20a) to (20c) in order from the inside to the outside are connected to a fan case (4) having the rear stage chamber with a volume smaller than that of the front stage chamber coaxially with a rotor drive shaft (9), the plurality of rotors (19a) to (19c) are operated in association with the rotor drive shaft (9), and chamber partition walls are fixed to the fan case (4) in the chambers (20a) to (20c) between the plurality of rotors (19a) to (19c).