US2049117A - Heat exchanging apparatus - Google Patents

Description

c. A. HUBERT 2,049,117

HEAT EXGHANGING APPARATUS Filed Dec. 5, 1954 2 Sheets-SheetI l July 28, 1936.

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July 28, 1936. C, A. HUBERT 2,049,117

HEAT EXCHANGNG APPARATUS Filed Dec. 5, 1934 2 Sheets-Sheet 2 Patented July A1936 UNiTED* STATES PATENT OFFICE application December s, 1924, serial No. '156,022 In France July 4, 1934 ifciaims. (ci. 257-248) This invention relates to improvements in heat exchanging apparatus.

With the known heat exchange apparatus embodying nned tubes, especially for waste gas economizers, soot deposits are produced as a result of the continuously altering section oi the smoke passages and. particularly between the` tubes of the vertical rows of tubes, that is at the points of largest sectionwhere there is necessarl0 ily a reduction in the speed of the gas and which cannot be reached on cleaning the smoke passages by the usual cleaning media (jet stream, cleaning brushes, chains or the like).

Also, the successive alterations in the section of the smoke passages deleteriously influence the regularity in the llow of the heating medium. The emciency ofthe heat exchange apparatus is thereby greatly reduced.

It has already been proposed in heat exchange apparatus formed of finned tubes to avoid the above-mentioned defects by providingv passages of which the section either does not alter greatly or does not alter at all. In such apparatus. the ns are not iltted to the body 0f the tube itself but to two walls located preferably tangentially to the body fof the tube and which iins are connected together by suitable struts.

In the known apparatus of this kind, the walls as well as the fins are straight and extend vertically from top to bottom of the apparatuaso that the flow oi' heating medium can pass between them easily and swiftly without being subjected to frequent changements-of speed. According to the invention the efliciency of the heat exchange in heat exchange apparatus of this kind will still be increased, by arranging the tube iins or walls or both simultaneously in such a way as to impart to the heating medium a certain swirling effect causing said medium to sweep 40 intimately thewalls of the passages. In order tc obtain this result the tube iins or walls or both simultaneously are shapedA and directed so as to form passages in broken or wave-like lines. The drawings show embodiments of the heat exchange apparatus according to the invention.

Fig. 1 is an elevation view of an ordinary finned tube with parallel straight walls tangential to the tube and straight fins projecting perpendicularly from said walls.

Fig. 2, 3 and 4 are cross sections of heat exchanging apparatus formed by placing side by side vertical rows of such tubes.

Fig. 5 is a corresptnding plan view. Fig. 6 is a cross section of heat exchanging apparatus withsloping tube walls.

l Figs. 'I and 8 'are cross sections of heat exchanging apparatus with curved tube walls.

Figs. 9, 10 and 1`1 are fragmental elevation views of heat exchanging apparatus with wave and broken lline and sloping fins. 5

In the various drawings I always indicates they body of the ilnned-tube;V 2 the two walls extending tangentially to the body ofy the tube; 3

the fins arranged on the walls; 4 the transverse struts extending between the two walls and 5 the 10 passages formed by the fins and walls.`

Figs. 1 and 2 show the known basic form of the finned tube serving for the formation of the heat exchange device.y The two straight walls 2 extend parallel to the axis of the tube body I and l5 the fins 3 extend perpendicularly from the walls and are also straight so that when several rows of superposed nned tubes are placed side by side and used for the purpose offorming a heat exchange apparatus, continuous straight ver- 20 tical channels 5 of constant section are formed. The end anges 'l-of the nned tubes may have exactly the same dimensions as the outer periphery of the pairs of iins on the body of the tube so that the ns of all the tubes come into contact 25 both laterally and in the vertical direction (Fig.

2) or they can be somewhat wider (Fig. 3) or wider and higher (Fig. 4). In the two latter cases the passages formed between the ns are in communication with one another. 30

Now according to the invention the passages 5 instead of being straight, are' arranged to produce a certain swirling effect in the gas by a corresponding formation of the walls 2 or of the ns 3 or of both simultaneously. 35

This result is obtained:

In Fig. 6, simply by sloping the walls 2 in the opposite direction from one horizontal row of tubes to the next whereby zig-zag channels are formed.

In Fig. 'l by curving the walls 2 so that the passages 5 are formed by a. successive series of circular segments.

In Fig. 8 by a curved formation of the walls 2 and at the same time with the tubes l staggered in the horizontal tube rows so that wave-like channels 5 are formed.

In Figs. 9, 10 and 11, which show partial longitudinal sections of heat exchange devices, by 50 the special formation or arrangement of the ilns 3, preferably on the vertical walls 2 so that they either extend in wave or zigzag lines or are simply sloped in opposite directions from row torow. 65

I claim:

1. A heat exchanging apparatus comprising several adjacent rows of superposed finned tubes wherein the iins projects perpendicularly from two parallel walls tangentialto the tubes, said ns and tangential walls being so formed and disposed that the passages therebetween have a progressively varying direction.

2. A heat exchanging apparatus comprising several adjacent rows of superposed ilnned tubes wherein the iins project perpendicularly from two parallel walls tangential to the tubes, said walls changing progressively in direction and the fins thereon being straight. l

3. A heat exchanging apparatus comprising several adjacent rows of superposed nned tubes wherein the ilns project perpendicularly from two parallel walls tangential to the tubes, said walls being straight and the fins thereon changing progressively in direction.

. 4. A heat' exchanging apparatus comprising several adjacent rows of superposed nned tubes v wherein the fins project perpendicularly from two parallel walls tangential to the tubes, said walls and iins changing progressively in direction.

CHARLES ADOLPHEHUBERT.

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