Modern Steam Turbines British And Foreign Comprising Descriptions of Some Typic
Modern Steam Turbines British And Foreign Comprising Descriptions of Some Typic
Arthur R Liddell
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Besides, if the positions of the blades be altered they cannot be recovered. Here also we see the saw-like grooves, which create vortices- in the axially flowing steam. These tend to prevent loss at the clearance space between the case and the guide blades and between the latter and the working- wheel. In recent times, however, less- stress has been laid on this point. The labyrinth apparatus closes the shaft at its exit from the case. In Figs. 16 and 17 are shown the constructions of the older... labyrinth stuffing boxes, which closed the shaft of the Schulz tur- bine. These stuffing boxes are extended for a considerable distance along the shaft, so as to make the path of the steam in the labyrinth as long as may be. Fig. 16 shows one of these stuffing boxes, in which the labyrinth is formed by two cylindrical castings fitting into each other with rings screwed to them. The inner casting is fastened to the shaft by means of an arrangement of screws, placed axially. The labyrinths may be thus regulated, so that the spaces left on one side of the rings are as little as TO inch, w r hile those left on the other side are comparatively larger and can serve as steam- chambers.
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