US Patent: 49,445
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| Giffard Injector
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Patentee:
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| William Sellers (exact or similar names) - Philadelphia, PA |
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Patent Dates:
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| Granted: |
Aug. 15, 1865 |
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Patent Pictures:
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Joel Havens
"Vintage Machinery" entry for William Sellers & Co.
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Description: |
| Abstract:
In this instrument, as heretofore constructed, the supply of water and steam has been regulated by means of screws, levers, or other devices controlled by hand, so that wherever the tension or pressure of the steam varies, the attendant is obliged to readjust the supply of water in order that the instrument may work to the best advantage, and whenever the pressure falls below the point to which the instrument has been adjusted a readjustment becomes necessary to prevent a waste of water at the overflow. In many boilers, such as the locomotive, and others having a small water and steam capacity compared to their heating-surface, and where the demand for steam is very irregular, the variations of the steam-pressure are considerable and very frequent, and the amount of attention required for regulating the injector becomes a serious inconvenience. The object of my invention is to make this regulation self-acting and dependent upon the amount of steam or water admitted to the instrument, and to utilize a power until now wasted at the overflow. The overflow, as heretofore used, has been for the purpose of permitting the escape of the water before it has attained sufficient velocity to enable it to enter the boiler when the jet is first started, and also to permit, when the jet is in motion, the superabundant water or steam to escape without stopping the operation of the instrument. It has long been known that the overflow was not necessary after the jet was fairly established, and the steam and water supply properly regulated; but it has not been known heretofore that when the jet is stopped by a superabundant supply of water, no provision being made for waste, an amount of lateral pressure may be obtained at the point of overflow nearly equal to that in the boiler. It has also been long]known that the fluid-jet, -in passing the point of overflow, will not, when in excess, carry along with it into the boiler any fluid that may be in contact with it, so that, if the overflow-chamber should be closed up, a moderate vacuum can be produced there by this action of the jet. The nature of my invention consists in using the pressure created by an overflowing jet to adjust the parts of the instrument so as to check the tendency to overflow, and in using the partial vacuum created by an excess of steam over water-supply to adjust the instrument to the new conditions without wasting any water at the point of overflow. The means employed by me for utilizing the power mentioned will be more fully understood from the following description, in which I illustrate a manner of regulating the instrument by an automatic adjustment of the water-supply only.
Claim:
The use of the overflow d d or its equivalent in the Giffard injector, in combination with a reservoir to retain the overflow-water in contact with the jet. |
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