Heat exchange – Radiator core type – Side-by-side tubes traversing fin means
Patent
1980-11-07
1983-08-30
Davis, Jr., Albert W.
Heat exchange
Radiator core type
Side-by-side tubes traversing fin means
165124, F28F 132
Patent
active
044011547
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a heat exchanger, and, more particularly, to a core construction for increasing heat rejection and improving cooling.
2. Background Art
Heat exchangers, such as those used in earthmoving vehicles, must have sufficient capacity to cool the engine by the passage of air through and around the heat exchanger core. In the past, it has at times been necessary to use large fans operating at relatively high speeds to provide sufficient air flow through the heat exchanger core. Unfortunately, large fans may use excessive power and cause vibration and noise which is undesirable. Current noise regulations, in fact, restrict the use of large noisy fans so that other means must be found to provide effective cooling without excessive noise.
One way to increase cooling capacity is taught by Roelf J. Meijer and Jan Mulder in U.S. Pat. No. 4,034,804, which issued July 12, 1977. This patent discloses a radiator operable with a flow of air for cooling a quantity of water and formed as zig zag or folded walls, each of which contains air ducts. Cooling water tubes with elongated cross-sections are arranged in a number of flat cores being of the same width as the tube widths. The upper and lower sides of the cores are located in the front and rear planes, respectively, of the radiator. The cores are connected together alternately on their front and rear sides in an airtight manner. Similarly, FIG. 1B, page 866 of the technical paper, "A High Performance Radiator" by Asselman, Mulder, and Meijer presented at the 1972 Intersociety Energy Conversion Engineering Conference, shows core connection members which completely cover the ends of the fins.
The zig zag pattern increases the cooling capacity by increasing the radiator surface area exposed to the flow of air without increasing the frontal area of the radiator. However, a problem exists with the zig zag core patterns disclosed above in that the air-duct surfaces of the respective core connection members are shaped and positioned substantially differently than the air-duct surface of the respective cooling water tubes such that the outermost ducts at both ends of the cores, formed by the respective outermost tube, core connection member, and adjacent fins, do not provide the same resistance to air flow as the ducts formed between adjacent tubes and fins. Consequently, the outermost tubes at both ends of the cores are not cooled to the same degree as the other tubes. Hence, such folded or zig zag pattern cores have heretofore not been fully effectively utilized at or near their maximum cooling efficiency.
Another problem with such zig zag pattern cores is that the cores become plugged with debris at the apexes defined by the zig zag pattern. The aforementioned U.S. Pat. No. 4,034,804 provides one solution to this debris problem in the form of a fine gauze placed around the outside of each core. Another solution to this problem is set out in U.S. Pat. No. 4,116,265 which issued Sept. 26, 1978 to Paul Staebler. The Staebler patent discloses gaps between converging, adjacent cores which are closed by movable plugs during normal use and which are opened when periodic debris purging is performed. Another solution to this debris problem is set forth in U.S. Pat. No. 4,076,072 issued to Erwin Bentz on Feb. 28, 1978. The Bentz patent discloses a zig zag pattern of cores which are spaced apart a short distance so as to continually permit debris that would normally pile up in the converging trough to go on through.
It is therefore desirable to have a heat exchanger core which will more closely approach theoretical efficiency for cooling. It is also desirable to avoid the debris collection problem in such an efficient heat exchanger core.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF INVENTION
In one aspect of the invention an improvement is provided in a heat exchanger which has a plurality of closely spaced fins having peripheral edges defining an inlet surface, an
REFERENCES:
patent: 1921278 (1933-08-01), Young
patent: 2602650 (1952-07-01), Marcotte
patent: 3478821 (1969-11-01), Fieni
patent: 3538984 (1970-11-01), Kaserman
patent: 4034804 (1977-07-01), Meijer et al.
Anders Gene A.
Larson Herbert J.
Miller Charles R.
Caterpillar Tractor Co.
Davis Jr. Albert W.
Woloch Anthony N.
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