Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Irregular – flanged or channel forming blade surface
Patent
1985-05-20
1987-03-10
Joyce, Harold
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Irregular, flanged or channel forming blade surface
416227A, F23L 1710
Patent
active
046483128
ABSTRACT:
An apparatus for ventilating an enclosed area comprised of a hemispherical dome-like head assembly covering an exit hole to an enclosed area to be ventilated, an external wind driven fan, and high efficiency internal exhaust fan blades adjacent to the exit hole being coupled to the wind driven fan. The external and internal fans are designed to be separated by the hemispherical dome-like covering over a vent tube and operate in conjunction with one another but are functionally independent. The high efficiency specially configured internal fan provides power to exhaust the air while the external fan provides the driving force. The external fan is provided by a series of vanes or fins on the external surface of the hemispherical dome-like covering while the internal fan is provided in the form of a series of specially configured fan blades beneath the hemispherical dome-like covering. The specially configured fan blades have curved flanges along a lower edge progressing into a concave surface lifting and discharging air from a vent tube. The hemispherical dome-like covering is supported on a tube shaped base capable of being mounted on an exhaust tube or roof stack positioned over the exit hole.
REFERENCES:
patent: 74655 (1868-02-01), Worth
patent: 209552 (1878-11-01), Demond et al.
patent: 1416295 (1922-05-01), Hirschman
patent: 1649161 (1927-11-01), Foster
patent: 1702120 (1929-02-01), Kimball
patent: 2013244 (1935-09-01), LaVergne
patent: 2227852 (1941-01-01), Smith
patent: 4093401 (1978-06-01), Gravelle
Joyce Harold
O'Reilly David
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