Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . supports) at one-third thedistance from the points of support, so that this design allows alighter shaft than would be required for distributed loading, andthe consideration of deflection is practically eliminated. Thisbuilt-up part of the rotor is rigidly attached to the shaft only atthe right-hand support, and the opposite end is fitted with abronze bushing surrounding the shaft, so as to permit the rotor COMMERCIAL TYPES 219 to move axially, without appreciable resist
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . supports) at one-third thedistance from the points of support, so that this design allows alighter shaft than would be required for distributed loading, andthe consideration of deflection is practically eliminated. Thisbuilt-up part of the rotor is rigidly attached to the shaft only atthe right-hand support, and the opposite end is fitted with abronze bushing surrounding the shaft, so as to permit the rotor COMMERCIAL TYPES 219 to move axially, without appreciable resistance, under any dif-ferential expansion of shaft and rotor.* The impulse sectionconsists of a flanged cast-steel disk forced on the body carryingthe intermediate Parsons blading. The flange of this disk isgrooved at the base and forms the dummy piston for balancingthe thrust of the intermediate Parsons section. Fig. 108 is ahalf-tone illustration of a 7500-kilowatt Westinghouse double-flow turbine. The rotor of a 6000-kilowatt double-flow turbine is shown inFig. 109. Details of the arrangement of nozzles and blades are. Fig. 109. Rotor of a Westinghouse Double-Flow Turbine. shown in Fig. no. It is seen that the nozzle block is a castingquite separate from the turbine casing. As it receives steamfrom the governor valve, high temperature steam is restrictedto a comparatively small casting which is made free to expandand contract with changes of temperature. A new type of shaft coupling for Westinghouse turbines isillustrated in Fig. in. Westinghouse Emergency Speed Limit. A very interestingmechanism is provided with Westinghouse turbines for shuttingoff the steam supply in case the governor fails to act and adangerous speed might be attained. Details of this mechanismare shown in Figs. 112a and 112b. In its essential elements it * This is an ingenious design but a more recent construction of Westinghouserotors is shown in Fig. ii2g, where the end sections of the rotor are cast in
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