. The Street railway journal . an entire ring of blades. The blading is made up in half rings. These rings are a thor-ough machine-shop job, easily inspected, with the uncertainty ofhand-work eliminated. No matter what precautions are taken to prevent trouble, it 728 STREET RAILWAY JOURNAL. [Vol. XXX. No. 16. is generally appreciated that the possibility of defective materialcreeping in makes easy facilities for repairs advisable. With theconstruction described any blading trouble would be localized,and damaged rings could be removed and the turbine continuedin operation until such rings could
. The Street railway journal . an entire ring of blades. The blading is made up in half rings. These rings are a thor-ough machine-shop job, easily inspected, with the uncertainty ofhand-work eliminated. No matter what precautions are taken to prevent trouble, it 728 STREET RAILWAY JOURNAL. [Vol. XXX. No. 16. is generally appreciated that the possibility of defective materialcreeping in makes easy facilities for repairs advisable. With theconstruction described any blading trouble would be localized,and damaged rings could be removed and the turbine continuedin operation until such rings could be replaced half rings can be inserted quickly and without disturbingthe thrust balance of the rotor. The improvements effected by this construction may besummed up as folows: 1. Firm attachment of blades. 2. Ample stiffening of blades of all lengths against effects ofvibration. 3. Accurate spacing and accurate angles of blades. 4. Protection of blade-tips, so that accidental contact will notrip out FIG. 5 —SECTION OF FOUNDATION—RING SHOWING ROOTSOF BLADES INSERTED 5. Smaller clearance, resulting in diminished steam-Leakageand, hence, increased economy. 6. Improved baffling against steam-leakage by reason of theshape of the shroud-ring. 7. Protection against a possibly defective blade coming outand destroying other blades. 8. Accurate machine-work, as against uncertain hand-work. 9. The facility for thorough inspection of workmanship. to. The localizing of any possible trouble and the convenienceof making quick repairs. Another difficulty that, in the past, caused some trouble, wasdue to the method used to balance the thrust along the rotor,resulting from the drop in pressure in the rotating blades of thereaction turbine. Balance pistons, connected with several pointsin the turbine cylinder, by means of equalizing passages, areused for this purpose. These balance-pistons (marked )are shown in Fig. 6. The earlier construction was to place t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
