Catalog no201: Buffalo Niagara conoidal fans . he only fan which is de-signed and constructed with a thorough understanding of all of the factorscontributing to the high efficiency of this class of fans. In multiblade fans a high suction is produced at the fan inlet and thistends to draw the air in at almost a right angle to the back or drive the air strikes the back plate it is deflected toward the blades and out-iet at almost 90° and naturally this sudden change of direction causes a loss ofvelocity and power. Also a large part of the air will be taken up by the rearpart of the bla
Catalog no201: Buffalo Niagara conoidal fans . he only fan which is de-signed and constructed with a thorough understanding of all of the factorscontributing to the high efficiency of this class of fans. In multiblade fans a high suction is produced at the fan inlet and thistends to draw the air in at almost a right angle to the back or drive the air strikes the back plate it is deflected toward the blades and out-iet at almost 90° and naturally this sudden change of direction causes a loss ofvelocity and power. Also a large part of the air will be taken up by the rearpart of the blade, the front part will not handle its proper proportion and anuneven pressure will be produced at the fan outiet, resulting in eddy currentswhich materially reduce the fan efficiency. The Niagara Conoidal Type Nfan is so designed as to entirely overcome these difficulties. The blades are narrow at the front and increase in width toward theback. This provides a large, unobstructed inlet. The hub, which is conical, B u F F A L o FORGE COMPANY. Back Plate and Hub deflects the air towards the blades without an abrupt change in direction andconsequently without loss of power. The inner or back edge of the blade exteiids froin the base of the conicalhub to the outside of the supporting disk to which the hub is riveted. Thediameter of the wheel is smaller at the back than at the front and the bladewider so as to offset the slower speed, the design being so proportioned as totend to equaHze volume and pressure over the entire length of the blade. However, the need of careful design does not end here. As the air istaken up and delivered at different speeds along the entire length of the blade,it is very important that the curvature of the blade should vary to meet theexact conditions existing at any point, On the inlet side the curve of theblade is sharpest nearest the intake where the velocity is the highest and thiscurve decreases toward the back, with the result that the air is sco
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventila, bookyear1915
