| 摘要 |
1471503 Axial-flow fans INTERNATIONAL HARVESTER CO 14 Jan 1975 [1 March 1974] 1536/75 Heading F1C A fan which sucks air through a radiator 16 is surrounded by a cowl, the shape of the cowl and the position of the fan blades 48 being such that air which has passed through the radiator and cowl, leaves the cowl radially, a disc-shaped barrier 31 downstream of the fan inhibiting reverse air-flow, the cowl which is attached to the radiator by a frusta-conical shroud 36 comprising a cylindrical portion 40 of axial length CF, a radial expanding. portion 42 of radius of curvature about a centre 46 given by R, and a radial flat portion 44 of radial width RF, the following relationships existing: RF = AW/3, CF = AW/3 and R = 2AW/3, where AW is the projected axial width of the fan blades 48. The barrier 31 is positioned downstream of the fan a distance equal to 15% of the fan radius. |
