Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . COMMERCIAL TYPES 201 narrower at the top than at the bottom. Into these slots theblades which have been cut at the roots to fit, are put singly „Soft metal spacing pieces of the required shape to fill the spacein the slot between the blades are calked to hold the bladesfirmly by a dovetail construction. This construction is requiredfor the attachment of the moving blades to give the necessary sup-port against centrifugal forces; but as the stationary blades, whichare fix
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . COMMERCIAL TYPES 201 narrower at the top than at the bottom. Into these slots theblades which have been cut at the roots to fit, are put singly „Soft metal spacing pieces of the required shape to fill the spacein the slot between the blades are calked to hold the bladesfirmly by a dovetail construction. This construction is requiredfor the attachment of the moving blades to give the necessary sup-port against centrifugal forces; but as the stationary blades, whichare fixed to the inside of the casing, are not subjected to centrifugalforces, the slots for these blades are not usually Fig. 95. Blades on the Rotor of a Westinghouse Turbine. Blade Lashing and Shroud Rings. It has been found necessaryto bind the blades together at their ends to make a stronger con-struction. In the earlier designs of Parsons turbines the blades wereusually bound together with wires soldered to their ends. Some-times, however, the blades were turned over at their outer ends toform flanges which were soldered together into a solid shroud. Fig. 95 shows several rows of blades of a Westinghouse turbine. 202 THE STEAM TURBINE All blades more than two inches long are reenforced by lashingwith a wire of special section threaded through punched holesin the ends of the blades. This method of lashing is illustrated SffMFLSS OF THE. WfcsTWGHOUSE &LF!DE LHSH/MG QftKSi^ftL- CtfA K&0
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