Fan shroud exit structure

Details Fan shroud exit structure Fan shroud exit structure

1974-01-28

1976-02-10

Davis, Jr., Albert W.

Internal-combustion engines

Cooling

Devices for cooling liquid by air flow

165 51, 165122, 165134, 180 54A, 415210, 415219R, 415DIG1, F01P 1110

Patent

active

039371891

ABSTRACT:
A heat exchanger apparatus for a liquid-cooled internal combustion engine including a radiator axially spaced from the engine, an engine driven, suction type fan axially spaced intermediate the engine and radiator for drawing cooling air axially through the radiator, and fan shroud means shaped and positioned with respect to the radiator and the blades of the fan whereby the major component of the air stream discharged by the fan is in a direction reversed to the direction to the major component of the air stream entering the radiator. The fan shroud structure is formed to provide a generally cylindrical exit throat section (CF), a radial flat discharge section (RF), and a radial expander or diverging section (R) serving as a transition between the throat section and the radial exit section and wherein the propeller-type blades of the fan have a projected axial width (AW). The various shroud structure sections are dimensioned with respect to such projected axial width (AW) of the fan blades and the fan blades are positioned with respect to such shroud structure sections in the following manner: CF = AW/3, RF = AW/3, R = 2AW/3, and the radial plane containing the trailing edges of the fan blades is axially spaced outwardly from the radial plane containing the radial exit section (RF) a distance X.sub.E and wherein the magnitude of X.sub.E is between 60 and 75 percent of the projected axial width (AW) of the fan blades.

REFERENCES:
patent: 2703075 (1955-03-01), Sanders
patent: 2896595 (1959-07-01), Guillo-Quevedo
patent: 3144859 (1964-08-01), Walton
patent: 3635285 (1972-01-01), Davis
patent: 3727593 (1973-04-01), Enke

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