Reflex fan cylinder for water cooling towers

Details Reflex fan cylinder for water cooling towers Reflex fan cylinder for water cooling towers

1981-08-31

1983-02-15

Miles, Tim R.

Gas and liquid contact apparatus

Contact devices

Wet baffle

261DIG11, 165DIG1, 415207, F04D 2954

Patent

active

043740723

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.

REFERENCES:
patent: 1399037 (1921-12-01), Uhde
patent: 1497408 (1924-06-01), Seelig
patent: 3780999 (1973-12-01), Fordyce
patent: 4221546 (1980-09-01), Papst et al.

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