| 摘要 |
<p>Steam turbines of different types require casings having lengthwise extending portions with parameters of length and cross-sectional contour and size determined by the encased turbine working elements and which, therefore, differ for the different types of turbines. Instead of the turbine casing being a single casting including all of these portions, the latter are formed by separate interfitting parts which are separate castings. A plurality of such parts are made for each portion with the parameters of each part differing from those of each other as required for the parts to form that portion of a plurality of differing types of turbines. That is to say, for each portion an inventory of parts is provided having differing parameters as required for differing types of turbines. To make a turbine casing for a desired type of turbine, the parts required for the various portions of the casing are selected having the parameters of that type of turbine and these parts are interfitted and interconnected to form the casing.</p> |
