Fan shroud arrangement

Details Fan shroud arrangement Fan shroud arrangement

1977-07-01

1980-01-01

Richter, Sheldon Jay

Heat exchange

Structural installation

Engine

123 4149, 165121, 165135, 416189, F28F 1306

Patent

active

041811720

ABSTRACT:
The mechanism shown and described herein is a cooling fan and associated dual shroud arrangement including (1) a rotating shroud comprised of a ring secured to the outer tips of the fan blades and a bell-mouthed inlet formed on the leading edge of the ring, and (2) a stationary shroud secured at one end or edge thereof to the radiator and terminating at the outer end thereof in an annular edge in front or upstream of the bell-mouthed inlet. A predetermined clearance is defined between the stationary shroud and the bell-mouthed inlet, effective to provide a smooth recirculating airflow around the rotating shroud and back into the main airflow stream, thereby substantially eliminating tip-vortex characteristics and resultant tip-clearance noise, and without unsteady flow interactions that cause rotational noise. In one alternate embodiment, the radiator is used in lieu of the stationary shroud for cooperation with the bell-mouthed inlet.

REFERENCES:
patent: 176755 (1876-05-01), Murphy
patent: 2186837 (1940-01-01), McMahan
patent: 3433403 (1969-03-01), Gerlitz
patent: 3794001 (1974-02-01), Birch et al.
patent: 3842902 (1974-10-01), Poslusny
patent: 3937192 (1976-02-01), Longhouse

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