Image from page 252 of "Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine" (1917)
Authors: Moyer, James Ambrose, 1875-
Publisher: New York, Wiley
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress
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rtis turbines. Wheel Disks and Blades. The blade wheels are usually madeof forged steel disks similar to Fig. 216, which increase in thick- COMMERCIAL TYPES 233 ness as they approach the hub, but in larger sizes the construc-tion shown in Fig. 113 is often employed. In some very smallturbines the blades are cut in the solid rim by special machines,while others have drawn or rolled blades which are cast intosegments (Fig. 115) of bronze alloy designed to be riveted to therim. A dovetailing meth-od similar to Fig. 63 isnow generally preferredto the method of insertingthe blades by casting.The fixed blades, or inter-mediates, are also eithercut or cast in segments(Fig. 116), and are fas-tened by bolts to the interior of the casing as shown in Fig. 57.These intermediates cover only the portion of the circumferenceupon which the belt of steam delivered by the nozzles can im-pinge. To make the blades more rigid, thin bands or shroudrings are riveted in segments to projections on their ends.
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Fig. 115. Curtis Moving Blade Segments.
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