Patent GB-585159-A (GB)
Title: Oil cooler
IPC: F16N39/02
Filed: 1944-02-23
Abstract: 585,159. Cooling radiators for aircraft; tubular heat-exchange elements. GARRETT CORPORATION.. Feb. 23, 1944, No. 3389. Convention date, Dec. 26, 1942. [Class 64 (iii)] An oil cooler, particularly for aircraft, comprises a tubular shell 10 with an oil inlet 44 and outlet 45, a warming jacket 12 surrounding the shell, rows of closely spaced parallel openended tubes 47, baffle plates 14 arranged parallel to the rows of tubes and dividing them into groups, and means for spacing the end tubes of the rows from the shell and for spacing each baffle plate from at least one row of tubes adjacent to it so as to provide wider paths 50, 51 for oil flow adjacent to the shell and baffle plates than the paths between most of the tubes themselves, alternate baffle plates being provided near opposite ends with ports at least one of which in each plate has its periphery partially defined by the shell, so that there is a zig-zag path of flow through successive sections in uninterrupted contact with the inner surface of the shell. The baffle plates and the spaces between them extend from side to side of the shell. Additional wider paths 64 are formed between the first two rows of. tubes above each baffle plate. The tubes 47 are of circular crosssection, and have hexagonal ends soldered together. Strips 59, 60, 63 arranged between the ends of the tubes and the shell and baffle plates, and between the ends of successive rows of tubes, form the spacing means resulting in wider paths. The spaces between the outermost tubes 47 and the shell are partly filled by tubes 67, Fig. 6, of rhomboidal section, the parallel sides of which are pinched at the parts 70 so that those parts are of. S-section, leaving external recesses 71 for the passage of oil. The baffle plates 14, which are corrugated throughout their lengths or at their ends only to fit between the ends of the tubes, have four apertures 15, 16 (not shown) in line near alternate ends, and three smaller apertures 18. The outer apertures 16 extend to the side edges of the baffle plates. Oil is supplied to the warming jacket 12 through an inlet 36 in a head member 27 the interior of which is divided into three chambers by partitions 32, 32<1>. If the oil between the tubes is congealed, oil flows from the inlet 36 into the jacket 12 and flows around the shell into the chamber 43 in the head member 27 and, since the pressure of the oil is high, lifts the valve 53 and flows back to the engine. Within the shell, the oil in the spaces 50 is the first to be heated, and when it has melted oil will enter the shell through the inlet 44 and flow back and forth through those spaces and the wide openings 16 in the back plate, to the outlet 45 leading to the chamber 38 in the head member 27. The oil pressure then falls and the valve 53 closes. During further operation, the oil in the spaces between the tubes adjacent to the shell and in the sides of the wider spaces 51, 64 melts, and the oil flows through them and through the openings 15 in the baffle plates. Finally, the whole of the spaces 51, 64 and the narrow spaces between the tubes are freed from congealed oil. Specification 555,373 is referred to.