Heat exchange – With impeller or conveyor moving exchange material – Mechanical gas pump
Patent
1992-01-14
1993-01-19
Flanigan, Allen J.
Heat exchange
With impeller or conveyor moving exchange material
Mechanical gas pump
123 4149, 180 681, F28F 1306
Patent
active
051800039
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to cooling systems for an internal combustion engine and more particularly to a dual fan cooling system therefor.
BACKGROUND ART
Since the advent of water cooled internal combustion engines, it has been an ongoing quest to improve air flow capabilities of the cooling systems, and thereby, increase overall cooling system performance. In a conventional cooling system, a single axial flow fan pushes air through the heat exchanger. In highly loaded systems, air velocity is typically greatest at the tips of the fans blades, and therefore, air flow is greatest through that corresponding area of the heat exchanger, generally at the heat exchanger's perimeter. In comparison, air velocity is typically lowest near the center of the fan, and therefore, air flow is lowest through that corresponding area of the heat exchanger, generally at the central portion of the heat exchanger. Air flow through the heat exchanger may even be substantially zero at the area corresponding to the exact center of the fan. Another disadvantage of the conventional system is the air already pushed through the greater air flow area may be recirculated back through the heat exchanger via the lesser air flow area. These conditions reduce the overall performance of the cooling system compared to the performance that would exist if the air velocities were uniform across the face of the heat exchanger.
The cooling systems for some internal combustion engines have incorporated dual fans in order to improve overall performance and air flow capabilities of current conventional single fan cooling system designs while also allowing various heat exchanger shapes. The dual fans are arbitrarily mounted to push or pull air through the heat exchangers. One of the problems encountered therewith is that the arbitrary mounting of the dual fans may not position the fans at the necessary locations to produce the most effective air flow through the heat exchanger.
Other known cooling systems have a first fan to push or pull air through the heat exchanger and a second fan to push or pull air through a separate area of a vehicle such as through a separate engine compartment. Since the second fan evacuates the hot air within the engine compartment, the hot air does not pass through the cooling system, thus improving performance. However, using two fans in this manner does not improve the air flow capabilities through the heat exchanger although cooling system performance may be increased due to the cooler air passing through the heat exchanger.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention, a dual fan cooling system is provided for improved cooling system performance. The system includes a heat exchanger, a primary fan, and a secondary fan. The primary fan has a predetermined diameter and is rotatably mounted on one side of the heat exchanger for pushing air through the heat exchanger in a preselected direction. The primary fan has a peripheral portion which produces an area of greatest air flow through the heat exchanger and a central portion which produces an area of lowest air flow through the heat exchanger. The secondary fan has a diameter smaller than the diameter of the primary fan and is rotatably mounted on the opposite side of the heat exchanger at a location sufficient for pulling air through the heat exchanger at the area of lowest air flow in the preselected direction and for substantially eliminating recirculation of air through the heat exchanger in the opposite direction.
The present invention is desirable in that the dual fan cooling system positions the secondary fan at a location sufficient for pulling air through the lowest air flow area of the heat exchanger. By locating the secondary fan so that air is pulled through the lowest air flow area of the heat exchanger, the invention improves the overall air flow capabilities, and therefore, the cooling system performance while substantia
REFERENCES:
patent: 1263227 (1918-04-01), George et al.
patent: 1306976 (1919-06-01), Searles
patent: 1576833 (1926-03-01), Larsen
patent: 1920883 (1933-08-01), Perkins
patent: 3309847 (1967-03-01), Donaldson
patent: 3840067 (1974-10-01), Bos
patent: 4382481 (1983-05-01), Moore
patent: 4738327 (1988-04-01), Takei
patent: 4909311 (1990-03-01), Nakamura et al.
patent: 4938303 (1990-07-01), Schaal et al.
Dicke Paul A.
Jensen Brian D.
Kouzel Richard L.
Penn Aubery W.
Caterpillar Inc.
Charlton Diana L.
Flanigan Allen J.
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