Seal arrangement for centrifugal fan

摘要

A centrifugal fan comprises a housing 12, and a rotatable impeller comprising blades 22, supported by a rim 24, having a collar 48, defining the fan inlet 34, so that the inlet rotates with the rest of the impeller. A seal 46, is provided between an edge of the rim 34, and the housing, the seal comprising a U-shaped component having leg portions (60, fig. 3) which are located on opposite sides of the rim. The rim may be provided with a stepped portion (68 fig. 4).