. The Street railway journal . similar in general construction and principleof operation to the well-known Parsons type. One of the principal features of the Allis-Chalmers turbineis the blading. The blading is manufactured by special machinetools which have been constructed for this purpose. One ofthe widest departures from previous practice is in the methodof securing the blades to the turbine spindle and cylinder. Theblades are first inserted in a foundation ring, which is after-ward secured in the turbine in such a manner as to withstandsafely the high centrifugal force, instead of inserti
. The Street railway journal . similar in general construction and principleof operation to the well-known Parsons type. One of the principal features of the Allis-Chalmers turbineis the blading. The blading is manufactured by special machinetools which have been constructed for this purpose. One ofthe widest departures from previous practice is in the methodof securing the blades to the turbine spindle and cylinder. Theblades are first inserted in a foundation ring, which is after-ward secured in the turbine in such a manner as to withstandsafely the high centrifugal force, instead of inserting the bladesindividually in the turbine. Another improvement is the ad- 440 STREET RAILWAY JOURNAL. [Vol. XXVI. No. 13. dition of a channel-shaped shroud ring which is riveted to theends of the blades, thereby stiffening them and preventing theeffects of vibration in weakening the blades. The flanges ofthis channel strip are made very thin, so that if from any ac-cidental cause the rotating and stationary part should come in. ALLIS-CHALMERS TURBINE SHAFT contact, the flanges of the ring will not be injured. The useof this protecting shroud ring enables the Allis-Chalmers Com-pany to build its turbines with a very low clearance between therotating blades and the stationary cylinder. The speed of theturbine is regulated by a spring-loaded centrifugal governoracting through suitable mechanism on the steam inlet valve. The turbine is lubricated by a thorough system of piping,whereby the oil is forced by a centrifugal pump, which isdriven by the turbine, through the system of pipes to the bear-ings, thence through a large cooler, and used over and overagain. There is a separate direct-acting steam pump in theoiling system for use in starting up the turbine, or to be used incase of emergency. The turbine and generator shafts are con-nected by an enclosed flexible coupling, and are carried in balland socket bearings lined with a special hard babbit metal. The generator is constructed
Size: 2620px × 954px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
