Reflex fan cylinder for water cooling towers
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United States of America Patent
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Feb 15, 1983
Grant Date -
N/A
app pub date -
Aug 31, 1981
filing date -
Aug 31, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved recovery fan cylinder for mechanical draft water cooling towers is provided which is configured with an upper reflex angle recovery section above the fan blade which gives unexpected increases in velocity head recovery as compared with conventional frustoconoidal stacks. The reflex stack hereof includes first and second superposed portions above the blade which are respectively oriented so that the external surfaces thereof cooperatively define a reflex angle; in preferred forms, the lower portion lies at an angle of from about 15.degree. to 30.degree. relative to the central upright stack axis, whereas the upper portion is oriented at an angle of 0.degree.-10.degree. on the same basis. Test evidence demonstrates that the stack of the invention permits unexpected reductions in fan horsepower, as compared with typical prior art stacks.
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