US Patent: 475,427
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| Single Cylinder Compound Engine
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Patentee:
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| Ellis J. Woolf (exact or similar names) - Minneapolis, Hennepin County, MN |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 14, 1891 |
| Granted: |
May 24, 1892 |
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Joel Havens
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Description: |
| Abstract:
My invention relates to compound engines, and has for its object to provide a single-cylinder compound engine of increased efficiency. To this end, as one feature of my invention, I so arrange the steam-passage and the valve that the opening of the port to the low-pressure end will be delayed for an interval after the exhaust begins on the high-pressure end at any desired cutoff in either motion without changing the dimensions of the valve, thus giving a longer period of expansion and allowing the stroke from the high-pressure end to be approximately completed before admission of steam to the low-pressure end, and accomplish this result without materially increasing the volume or decreasing the pressure in high-pressure end by noneffective increased area. Undue preadmission at the low-pressure end is thus avoided and compression in the same is correspondingly reduced. In my preferred construction for this purpose I locate the steam-passage in the valve itself, and construct the valve so that it has on the inner wall of the valve-cavity an outside lap equal to the outside lap on the valve proper when the valve is in its central position; or, in other words, I give the valve on the inner wall of the valve-cavity a lap, which will cover the low-pressure port for a considerable time after the exhaust begins from the high-pressure end into the valve- cavity. I thereby obtain a delay or interval between the time of the beginning of the exhaust at the high-pressure end and the beginning of the opening of the port at the low- pressure end equal to the valve and piston travel required for the ordinary lap, and the pressure is reduced at the high-pressure end only by the small amount corresponding to the proportional additional area of the steam passage or cavity in the valve.
Claim:
In a single-cylinder compound engine, a valve provided with a cavity for the passage of the steam from the high to the low pressure end of the cylinder and having on the inner wall of the valve-cavity a lap covering the low-pressure port for delaying admission to the low-pressure end after the exhaust begins from the high-pressure end into the valve-cavity. |
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