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Title: |
1893 Article-Westinghouse Machine Co., Steeple Compound Double Acting Steam Engine |
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Source: |
Cassier's Magazine Sep 1893, pgs. 340-343 |
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Insert Date: |
11/28/2012 9:14:21 PM |
While the Westinghouse Machine Company of Pittsburgh have at the Fair a number of their well-known "Junior," "Standard" and regular compound engines, the chief interest of their exhibit lies in six steeple-compound engines of an entirely new type recently developed by them, the engines being double and not single-acting like the other Westinghouse engines, and each being rated at 1ooo horse-power, which is the smallest size of this type to be turned out. The general and sectional views and the end elevation of one of these engines which accompany this paper clearly explain the main features of the design. The low-pressure cylinder is mounted above the high-pressure cylinder and has a flat slide valve. The high-pressure valve, on the other hand, is of the piston type, and the exhaust from the lower end of the high-pressure cylinder passes up through the inside of the valve on its way to the upper cylinder. In order to afford adequate cushioning for a valve so large and heavy as this one, the designer provided a special cylinder for the purpose, shown at the right of and below the high-pressure valve chest in the vertical section. The high-pressure eccentric, it will be noticed, is mounted on the outside of the crank case, next to the governor wheel, as in the regular Westinghouse compound engines, the motion being transmitted to the valve rod proper through several rocker arms and a connection with the cushioning cylinder plunger in the manner shown. The cushioning medium in this cylinder may be either air or steam, and when steam connections are made to the cylinder, it may be used as a starting cylinder for the high-pressure valve, connection of the latter with its eccentric being temporarily broken by a special disengaging gear provided for the purpose.
The low-pressure eccentric which, unlike the automatically governed high-pressure one, provides for a fixed cutoff, is mounted inside of the crank case and connects with a cross head from which two rods lead off to the low-pressure valve, straddling that on the high-pressure cylinder. The engines are all direct-connected to Westinghouse electric generators, and run at a speed of 200 revolutions per minute. The high and low-pressure cylinders measure respectively twenty-two and one-half and thirty-seven inches in diameter, and have a stroke of twenty-two inches. |
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1893 Westinghouse Machine Co., Steeple Compound Double Acting Steam Engine
1893 Westinghouse Machine Co., Steeple Compound Double Acting Steam Engine (End Elevation)
1893 Westinghouse Machine Co., Steeple Compound Double Acting Steam Engine (Vertical Section)
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