A multi-blade impeller for a cross-flow fan.

摘要

A multi-blade impeller for a cross flow fan includes a plurality of axially elongate blade elements (11), at least two disc-like holder plates ( 12a, 12b, 12c) integrally connected to the blade elements (11), and a drive shaft (18) connected to at least one of the holder plates 12c) for rotating the impeller. The drive shaft (18) in its free end portion is of a non-circular cross-section, and has a circumferential groove The holder plate ( 12c) to be connected with the drive shaft (18) has a boss (21) having a center bore of a corresponding, non-circular cross-section, as well as radially inwardly projecting lugs The lugs are adapted to resiliently deflect axially during insertion of the free end portion into the boss (21), and then to snap into the circumferential groove in the free end portion of the drive shaft (18), for preventing unintentional withdrawal of the drive shaft (18) from the boss (21) of the holder plate ( 12c).