FAN SHROUDS PARTICULARLY FOR FANS FOR AUTOMOBILE ENGINES

摘要

1412680 Axial-flow fans FORD MOTOR CO Ltd 18 Sept 1973 [4 Oct 1972] 43626/73 Heading F1C A fan shroud, e.g. of an engine cooling fan, includes a generally cylindrical section adapted to surround and axially enclose a fan and having circumferentially spaced projections from its internal surface to provide a circumferentially undulating pattern to the axial flow of air past the shroud, thereby reducing noise. Instead of being square as shown, the cross-sectional shape of the projections 24 may be semi-circular. The projections are tapered in radial height at their leading edges.