. Steam engines, a thorough and practical presentation of modern steam engine practice . und Type. As an outgrowth of the demand foran engine of high speed and one that will occupy a small space, butwhich, at the same time, will be economical in the use of steam, therehas been developed the angle-compound engme shown m Fig. 29. 28. Corliss Valv 40 STEAM ENGINES Balancing. In an ordinary high speed steam engine, the inertiaof the reciprocating parts—namely, the crosshead, piston, andpiston rod—and the crosshead end of the connecting rod, is con-siderable. If a steam engine is to be installed in
. Steam engines, a thorough and practical presentation of modern steam engine practice . und Type. As an outgrowth of the demand foran engine of high speed and one that will occupy a small space, butwhich, at the same time, will be economical in the use of steam, therehas been developed the angle-compound engme shown m Fig. 29. 28. Corliss Valv 40 STEAM ENGINES Balancing. In an ordinary high speed steam engine, the inertiaof the reciprocating parts—namely, the crosshead, piston, andpiston rod—and the crosshead end of the connecting rod, is con-siderable. If a steam engine is to be installed in office buildings,apartment houses, or in other houses where freedom from vibrationis a prime requisite, it becomesalmost a necessity for the engine tobe perfectly balanced. On an ordi-nary reciprocating engine it isalmost impossible to obtain perfectbalancing for two reasons: First, because of the angularityof the connecting rod, which causesthe rate of acceleration of the recip-rocating parts to be much fasterat one end than th*; other, therefore,the counterweight which exactly. Fig. 29. Section of Angle-Compound Engine balances the forces at one end would be either too light or tooheavy at the other end. Second, the counterweight at all positions in the revolution ofthe shaft exerts a radial force and when the counterweight is aboveor below the center of the shaft, there are no reciprocating partsdeveloping a counteracting force, hence the centrifugal force of the STEAM ENGINES 41 counterweight exerts a powerful unbalanced vertical force. (Thishas been observed a number of times in locomotive practice wherethe rails have been bent by the extremely heavy blows of the unbal-anced forces.) In tests at Purdue University on their locomotive testing plant,it was clearly demonstrated that the unbalanced vertical forces areso great at high speeds that the locomotive driver is at times liftedclear off the track. It is obvious from the foregoing that the ques-tion of balancing is
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsteamen, bookyear1920
