| 摘要 |
A tubeaxial fan ( 10 ) broadly including a cylinder ( 12 ), a propeller ( 14 ) rotatably supported in the cylinder ( 12 ), and a drive assembly ( 16 ) operable to rotate the propeller ( 14 ) is disclosed. The propeller ( 14 ) includes blades ( 28,30,32,34,36,38 ) each having an inventive blade design. The inventive blade design presents a chord length (C), a stagger angle (beta<SUB>e</SUB>), and a camber height (delta<SUB>c</SUB>) that vary along each of the blades as shown in TABLE 1. The inventive blade design presents an external surface of each of the blades having a shape defined by the relative positioning of a plurality of coordinates contained in at least nine cross-sections (e.g., the blade ( 28 ) includes cross-sections ( 44,46,48,50,52,54,56,58,60 )). The cross-sections ( 44,46,48,50,52,54,56,58,60 ) of the illustrated blade ( 28 ) have the corresponding plurality of coordinates listed in TABLE 2. The drive assembly ( 16 ) incorporates an inventive design that presents, among other features, a cover dimension D<SUB>C </SUB>of the bearing cover ( 72 ) of less than about one-sixth the propeller diameter (delta), and tapering end sections ( 76 a ,76 b) on the belt cover ( 76 ). A preferred alternative embodiment is also disclosed in the fan ( 210 ) including support plates ( 212 a ,212 b) having a plate width (W<SUB>P</SUB>) between about one-tenth and one-seventh of the axial length of the cylinder ( 212 ).
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