US2340855A - Supplementary radiant heat cooling fins - Google Patents

Description

1944- v. R. ABRAMS SUPPLEMENTARY RADIANT HEAT COOLING FINS Filed Aug. 12

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My: $145M heat Patented Feb. 8, 1944 UNITED STATES PATENT OFFICE 2,340,855 SUPPLEMENTARY Rl lllgflsANT HEAT COOLING Victor B. Abrams, Maplewood, N. J. Application August 12, 1942, Serial No. 454,512 2 Claims. (01. 257-261) (Granted under the act of March 3, 1883, as

amended April 30, 1928; 370

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to air-cooling means and in particular pertains to a device for utilizing a greater degree of radiation combined with conduction by means of auxiliary conducting elements inserted between the vanes of conventional air-cooled bodies such as engine cylinders and the like.

It is therefore an object of the invention to provide means for a more rapid and eflicient removal of heat from the air-cooled bodies. A further object is to provide for the more eflicient removal from air-cooled bodies having cooling vanes by inserting a heat-conducting member between adjacent vanes. Still another object is to enlarge the eflective radiation area from vaned, air-cooled bodies.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawing in which:

Fig. 1 is an elevational view of a portion of a radial engine with vaned cylinders.

Fig. 2 is a section taken on the line 2-2 of Fig. 1.

Fig. 3 is a view of an auxiliary vane unit as in Fig. 1 but separate from the motor assembly,

Fig. 4 is a view similar to Fig. 3 showing a modiflcation, and

Fig. 5 is a detail of an auxiliary fin support.

Referring to the drawing by characters of reference there is shown a motor l'having radial cylinders 2 with ribs or vanes 3 to increase the air-contacting surface, although it will be understood that the radial type is merely for purposes of illustration, and the invention may be practised with other types of engines such as V types and in-line cylinders. Extending into the recesses between vanes are metal sheets 4 comprising complementar parts meeting in the line 5 and having arcuate portions 6 conforming to the peripheries of the cylinders. may be supported in any convenient manner so that the arcuate portions are maintained approximately midway between the cooling vanes 3. As shown this is accomplished by means of uprights fastened to the engine and comprising an outer member I, and an inner member 8 slotted as at 9 to receive the edges of adjacent sheets 4. The supports shown may be omitted since the vanes can be self-sustaining both by reason of their configuration and by additional means such as dimples l2 struck in the vanes as shown in Fig. 4.

The sheets 4 Support between sheets is afiorded by straps ll perpendicular to the sheets and fastened by riveted flanges II or other suitable means such as spot welding. Since bailles are usually desirable in the type of cooling the'straps in are curved to accomplish this additional function of diverting the air to the rear of the cylinders. The bailles will preferably have a front opening l3 to allow cooling air to reach all parts of the vanes, but it will be understood that in some cases the baiiles will be closed throughout their length.

It will be seen that whereas the usual ribbed type of body for cooling offers considerable advantage with respect to the increased surface which the cooling air may reach, this is purely a conduction effect. The radiation rate is not increased since the radiation area; remains as the projected area of the cylinder wall, the same as if the ribs were not present. The sides of the ribs are merely looking at each other" and the resultant of their radiation is very nearly zero. By reaching in with an auxiliary cooler vane radiant heat transfer is brought into play and contributes to the heat exchange, the radiated heat being carried off by conduction through the auxiliary fins which present a considerable surface to the air stream for dissipation of the heat. thus preventing that portion of the auxiliary fins between the cooling ribs from approaching the condition of radiant heat blockage which obtains in the conventional grooves without the auxiliary conducting member.

In addition to supplementary heat exchange by transfer of radiant energy a second cooling effect is introduced by the interposed auxiliary fins. This action depends on the cooling of the air mass by the auxiliary fin below the temperature to which it has been heated by the cylinder fin.

loss of heat maintains a greater temperature differential between the engine fln and the cooling air and hence promotes a greater heat exchange.

While. an auxiliary vane has been shown extending into each trough, it may be expedient. where the ribs are closely bunched as they usually are in the straight portion of the cylinder, to

,place the vanes in alternate troughs. Thus each rib will have a radiation outlet, although only one side of any rib will in this case contribute to the heat transfer.

It will be understood that the particular form and extent of the auxiliary vanes shown and the manner of mounting are for illustrative purposes and these details may be varied in considerable degree without departing from the spirit of the invention as defined in the appended claims.

I claim:

1. In an apparatus having cylinders with corrugations, auxiliary vanes between saidcylinders and having end portions complementary in shape to the periphery of said cylinders and spaced therefrom, means on the apparatus to support said vanes, spacing straps secured to and be-

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