Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers . The Davidson 8. The fan shown in Fig. 8 is the Davidson patent, more commonlyknown as the Sirocco fan. This sketch is taken from some of theolder drawings and represents the fan as built at the time the patentwas issued, in 1900. It will be noted that the blades are narrowerradially and are more closely spaced than in the fans previouslybuilt. Also that in the original Davidson design, the blades pro-jected their entire depth within the inlet circle. Numerous change* THE CENTRIFUGAL FAN 49 have
Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers . The Davidson 8. The fan shown in Fig. 8 is the Davidson patent, more commonlyknown as the Sirocco fan. This sketch is taken from some of theolder drawings and represents the fan as built at the time the patentwas issued, in 1900. It will be noted that the blades are narrowerradially and are more closely spaced than in the fans previouslybuilt. Also that in the original Davidson design, the blades pro-jected their entire depth within the inlet circle. Numerous change* THE CENTRIFUGAL FAN 49 have been made in the general design since this fan was Single Inlet American Sirocco Fan—Full 9. In the modified design as employed in this country the wheelused is in most respects similar to the first one just shown, but aswill be seen from Fig. 9, the blades do not project within the inletcircle. It will also be noticed that the pipe connection at the fanoutlet comes to about the center of the fan housing, so that a muchlarger pipe with the same size outlet is used than shown on the orig-inal design. That is, the pipe coinection is increased to practicallyfifty per cent, larger than the discharge area by extending the outletconnection below the point of cut-ofif as here shown. The Niagara Conoidal fan as built at Buffalo is the most recentdevelopment in the design of multivane curved blade fans. As willbe noted from Fig. 10, this fan embodies two special features; first,the diverging cone effect is brought back into the fan housing. iU THE
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Keywords: ., bookcentury1800, bookdecade1890, bookidtransactions, bookyear1895
