Elektrogebläse mit Abluftrückführkanal.

摘要

An electric blower has an electric motor (2) driving a rotating centrifugal impeller (32), an end bracket (21) for separating the electric motor (2) from the centrifugal impeller (32), and a diffuser (31). A flat plate (31b) extends between the impeller (32) and the end bracket (21) for supporting diffuser vanes (31a) and has a plurality of guide vanes (31c) formed opposite to the diffuser vanes (31a). A passage is defined by the end bracket (21), the flat plate (31b) and the guide vanes (31c) so as to return the air flow discharged from the centrifugal impeller (32). The end bracket (21) is formed in a substantially convex shape so as to come away from the flat plate portion (31b) of the diffuser (31) according as the end bracket (21) extends from its central portion toward its periphery, thereby securing an opening area of the discharge air flow return passage in which a sound absorbing material (11; 111; 311) is arranged to absorb sounds from the discharge air flow.