US2586118A - Furnace heat exchanger - Google Patents

Description

Feb. 19, 1952 w. R. TELLER FURNACE HEAT EXCHANGER Filed Nov. 27, 1946 INVENTOR. \A/ILLIAM R. TELLER Maw A TTOF/VFY.

Patented Feb. 19, 1952 [FURNACE HEATEXGHANGER w l e n' .h- Te r. .Q e nd. ch p. :a sisnor. by

assi nments... o me t n afl eveland, h

Delaware ed sulperp rat en of 1 'Glaim.

This invention relates .to sheetmetal heat-rexchanger tubes for welded assembly with similar tube units in a battery; the battery being particularly intended for employment to transfer heat from high temperatureproducts of combustion, to forced air to be heated'for comfort; as-fqr xa e n a ga -fi e orced eh fume e hni' heater.

Objects of the invention are to provide, in-such a tube, a minimum joint to be welded, a form and location facilitat g the necessary welding, and optimum joint locatlon in subsequent service.

Another object is to attain the same desiderata, as applied to the battery assembly of the tubes.

Still another object is to provide a batery as well as tube form therefor, capable of serving in the furnace or the like, as an integral structural part thereof as will appear.

Further objects and advantages will be apparent from the following description taken inconnection with the accompanyingdrawings, wherein i Fig. 1 is a perspective view-of a tube unit embodyingthe invention, r

Fig. 2 is a sectional elevation intermediate the ends of the tube shown in Fig. 1,

Fig. 3 is a perspective view'of abattery of such units,-and

Fig. 4 is a perspective view of pertinent parts of a forcedair furnace in which such a battery is incorporated, nearby parts being omitted to show detailsof construction.

In the drawings the indicated tube disposition is that providing horizontal passage therethrough, and hereinafter terminology will i1np;ly such disposition. However, this is primarily for convenience, and to avoid confusion; audit will be 'understood'that, while "such disposition is preferable in some instances as will appear, the invention is in nowise limited thereto.

With reference now to the drawings and first to Figs. 1 and 2 thereof, the tube is formed of a single, generally rectangular piece of sheet metal generally bent upwardly on either side of its transverse midsection so that the tube provides a horizontal passageway of much greater height than width, is seamless at its bottom and has a longitudinal seam along its top.

The tube is formed to have rectangular section at end portions as appears in Fig. 1, each end portion including a pair of flat side members I, a single flat bottom member 2, and a pair of flat top member 3, meeting each other edge to edge. These members, at each end of the tube may be *2 e exiehsive lon tudinal y iheree ewe er preie eh etee h tube ensl ne o the he ide members I extends outwardly slightly beyond its c r e ondin member t heme w ldin of the tribe in bat e y. a w ll eppe rhe eine ter- .heneitusiihelh' i te diet these j e fi hel e end porti ns. he tube semewhetle width all? s ee teu ed 9 eridee e earn rs as 1 di ete t it top .th 'thhe its .l hs di e eam h e ie d y" ns e he flan es ex endne betwe n an te ain see set t e re tangula end erti hs e the tube Preferab y .eneo'f the flan e 5 ext hds up sli htl her es the othe two; thu lfermihe ,a sligh ,ereev' eb wee t e flan es to .raeiht te elding herea eha th e s e h em le esi Providin enl o adde meteinand alo g s eh roove as in the shielded arc metheeo i p o i eat trans e wh l e m ttin e ehins and mol ng noise, a w a pe r. h t be ma he prov. e d w h ne or me eve ti all s eees se ese es .defehm hs 1. th se 'deie t net en te m nating in es.

sli ht y w thin t e anes o he ee i esre e ins si ed e mem ers I .of .t e ,reet hgule end ion .9 the tube a app a s i F et- 7. 1 form th heat ex'ehahse bat ers e p rality .Q tub is a ed 1; si e b .tsi e l ti n a indi at ihFig. 3-

.In ue.h, r lat on adiae nt sid m mbers t h en neri h .e each esii eeh pe ref tubes a e nter ehheei zh wel in a at 8 alens their 1 v exte d pe e extrem ties- These weldin operations iareieeflhates b th ,QIQWQ fe mes .elehs .sueh .ez hte ities .h th .eziteh le of one edgebeyondtheot er, .of each pair of side t e .weldes t gether .1 th sa mashe .e de cribed e nheet eh w th th r oves .6 a th :l hshud he .ef the ind vidual tubes.

It will be apparent that the battery thus formed will provide, besides the horizontal flow path along and through each tube, a vertical flow path between each adjacent pair of tubes, of less width than the horizontal paths, and into which the bosses I project, the bosses of adjacent tubes slightly clearing each other.

g It will also be apparent that the battery is of generally rectangular form about the aggregate of both its horizontal and vertical series of flow paths. More particularly at each of its aggregate horizontal flow path ends the battery eifectively has a peripheral flange formed at the top by the corresponding fiat top members 3 of its tube end portions, at the bottom by the flat bottom members 2 thereof and at its lateral extremities by the far flat side members I thereof.

With reference now to Fig. 4, the battery may be assembled as an integral part of a furnace or the like by incorporation with confining or closure means, and including panel means adjacent corresponding ends of a series of flow paths, with flange means overlaid on the corresponding adjacent end flange portions of the battery.

Thus as in Fig. 4, at the bottom of the battery where the closure means may bound a combustion chamber to enclose a burner l4 or other source of heat, panel members 9 may be provided, having flanges I extending along and engaging the corresponding adjacent end flange portions 2 of the tubes of the battery. Similarly at the top of the battery, to provide a flue passage leading therefrom, panel members ll may be provided with flanges I2 overlaid on the corresponding adjacent end flange portions 3 of the several tubes, the upstanding flanges 5 of the longitudinal tube seams fitting between the panel members H as indicated.

At the ends of the battery, adjacent the end tubes thereof, means such as the panel member l3 are provided for closure to complete the combustion chamber below the battery, and the flue passage above the battery As will be appreciated, each closure panel member I3, of which only the far one appears in Fig. 4, has suitable connections with the panel members 9 and II, and the corresponding near pair of flat side members I of its near tube, so as to provide a vertical flow path from the combustion chamber to the flue passage, bounded on one side by the panel member l3 and near side of the near tube, such vertical flow path being half the effective width of the typical vertical flow path between adjacent tubes of the battery.

The parts are interconnected by welding to preserve their described assembled relation. Suchwelding includes, in horizontal planes, at the bottom of the battery welds along the adjacent ends of the flanges i0 and 2, and at the top of the battery along adjacent extremities of flanges i2 and 3. Here also, if desired, to facilitate welding the parts may be so proportioned that the continuous flanges l0 and I2 extend slightly beyond their correspondingtube flanges 2 and 3 respectively, generally as already described in connection with thegrooves 6 and 8.

The end panels i3, besides havinginterconnection with the panels 9 and l l in a convenient manner, have edge welded connection along the extremities of the adjacent flat side members I of straight sheet metal edges, so that it is easily accomplished and the resultant joint easily inspected. Particularly no welds are exposed to direct heat from the burner M or other source of high temperature within the combustion chamber; exposed parts of the individual tubes there being seamless. The seams 6 at the tops of the tubes are exposed only to the relatively low flue-gas temperatures at that location. The remaining welds are exposed only to temperatures greatly therebelow, it being understood that in practice, means not illustrated are provided for forcing air to be heated through the horizontal flow paths of the battery.

What I claim is:

Apparatus of the class described comprising a sheet metal heat exchanger battery, of tubes in horizontally extending side-by-side disposition, each tube having rectangular form at each end thereof, provided by end flange means extending peripherally about the mouth of the tube, with four rectangularly related end flange portions disposed in planes longitudinal of the tube, each tube having curved top and bottom portions longitudinally extending between its said end flangemeans and being of less width between than at said end flange means, each tube being seamless along its bottom, and having a seam along its top formed with upturned flanges of rectangular outline, extending between, terminating at, and upstanding beyond its said end flange means, said upturned flanges being welded together along their upper extremities, and

' closure means for said battery, disposed at an welded to the latter at their endwise extremities,

and said closure means including a face panel portion upstanding from its said outturned flange and bearing against the corresponding ends of the upturned flanges of said seams of said tubes.

- WILLIAM R. TELLER.

REFERENCES CITED I The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 970,297 Boeck Sep. 13, 1910 1,673,992 7 Owen June 19, 1928 1,775,103 Hume Sept. 9, 1930 1,816,757 White July 28, 1931 1,974,834 Sadwith Sept. 25, 1934 2,200,549

' Grapp May 14, 1940

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