US2373900A - Heat exchanger - Google Patents

Description

April 17, 1945. p |VAR v 2373,900

HEAT EXCHANGER Filed Nov. 25, 1941 2 Sheets-Sheet l INVENTOR filzelz 712/ 17 BY WM fiAU- MAM ATTORNEYS.

April 17, 1945. A. P. LIVAR 2,373,900

HEAT EXCHANGER Filed Nov. 25, 1941 2 Sheets-Sheet 2 INVENTOR 35,; 27 /Z/ flZ/e P1214421 NW, 824, 04a & MW

ATTORN EYS'.

Patented Apr. 17, ,1945

7 09. l HEATEXCHAN'GER;

Allen P. arinayah,.ohaissa mmisses Corporation, Detroit, Mich, a corporationof v Delaware 1 Application November. .25, ianfsei 1 Claims. t (01.1126

1 My present invention relates to the construction of warm air furnaces, space heaters or the like having particular regard to the vheat exchanger body thereof. My invention distinguishes from prior space heatenand furnace heat exchangers in the utilization of relatively few -part's of very simple construction. -The principal object of my invention is'to provide a heat exchanger of relatively simple construction occupying as little spaceas #possible and having a high rate of heat transfer.

Anotherobject of my invention is to form a heat exchanger assembly of relatively-"simple parts comprising principally flat, plates, easily formed cylindrical flue connectors. and a plurality of identical tray-like members; By the use of a plurality of tray-like members I am able tobuild-the heat exchanger body with the use of only one set of simple dies and forming fixtures, all other parts of the heat exchanger body being iorrned of sheets or cylindrical sections easily manufactured on standard sheet metalworking machines. a f Afurther object of my invention is-to provide a -type of heat exchanger assembly which-can befformed in a plurality of difierent' styles from a relatively few simple parts. Thus the-"sheet metal machines may be run continuously to stamp out and forma large stock of standard parts which can be interchangeably assembled to fill' orders for heating equipment of widely different capacities and styles; r K These and other objects and advantages of my present invention will bemore readily ascertainable froman inspection of the following specification taken 'in' connection with the ac companying drawings wherein like numerals refer to like parts throughout. I In the drawings, I I f 1 Fig. 1 is'a wide elevational vviewof a space heater embodying the present invention;'. Fig.2 isa front'elevationalview of the space heater; Fig. 3 is a view in perspective of the assembled heat exchanger body; I I f v I 7 Fig.3; is a plan view of the heat exchanger bp l, q 1 1 v p A Fig. 5 is a verticalsection taken substantially along line 5-5 of Fig. 4-. v I

Intheydrawings there is disclosed in Figswl; and 2 aspace-heater of the gravity circulating; gas fired type, but it should be obvious fromsthe following 7 description that the. heat exchanger body of the present invention may be used in;

.99) othe of, furnaces. As disclosed, the space heatertcomprisesnn enclosing jacket l'llhavmg grillesill atathe 5:10W61: portion thereof through whichi air is inducedto travel byflthermosiphonic action;.-;the-.ainpassing. over the heatexchanger body enclosed in thejacket I0 and intqthespace to be heated through the open top of'the jacket lflpwhichhmay be suitably protected by a screen orjgiglille.:(not;shown). 'Apair of angle bars 12- extend from ,1theiront to the rear wall-of the. jacket; and support the heat exchanger body l4 comprising: ,the1 present; invention. Y 1* The;,heatlexchangerfbodypshown in Figs. 3 ,4 and5,;-comprise's a firebox section l5v 'and'=a"ra-- diator isectionJS, said sections being formed as substantially, .rectangular 4 enclosures, of. L:relativelyrygreat width. and height ,with. respect to tneirzdepth... The .fireboxlsection' l5 comprises a tray-like.- member: :1 1V having. a flange 18 extend ing peripherally: around its edge and lying in a lplanezz substantially parallel .to the bottom oi 'zs-a'ndqa bottom'wall 21-',' the depth of the enclosure being substantially twice the depth of a single one of the traylike' members llor l9.

Tli radiatorjsection is iformed from a single I tray-like member 311; substantially identical to is proyidedjwith 'anaccess opening-to the edgeof whi is rasteiieaa tubular member 4a through WW f f heiiisnir t j be 41. leadin to er -'1 42flocated-;within the firebox secsuriacel of tubular-member. "40. for'the purpose vof supporting amountin'g plate 44 which s -eviqed -w h a secondary. air. open ng 45 ands t rrdi tf w l 33, the meta s '34 and l336'and the bottom walljl of ll l r f n clips; 43 may be welded to the' inspection door 46, and which provide means for supporting the outer end of the inspirator tube 4| and the gas supply tube 41 together with such other instruments as are commonly associated with gas burners. The tubular member 40 is preferably of such diameter that the burner head 42 may be withdrawn and inserted therethrough and the bottom wall ,2!v of the firebox section 15 is preferably provided with a supporting member 48 upon which the burner head and inspirator tubeare supported.

The firebox section is joined to the radiator section by means of spacer bars 50 welded or other wise suitably attached to the upper comers of the two sections, and a pair of flue connectors'il extending between the lower corners thereof, the bars 50 and connectors 5| being so'aligned as to identical tray-like members l1, l9 and 30 may be formed by a deep-drawing, die-pressing operation, or that the same may be formed by other methods such as by notching and shaping a flat sheet and welding the corners of the side walls of the tray-like members.

I claim:

1. ,A warm air furnace heat exchanger comprising a firebox section and a radiator section, said sections being formed as substantially rectangular enclosures comprising front and rear Walls of sub- 'stantially the same size and side, top, and bottom walls, said sections being horizontally and laterally aligned with the rear wall of the firebox hold the two sections in horizontal and lateral alignment with the rear wall 23 of the firebox 1 section spaced from and parallel to the front wall 33 of the radiator sectiom-the' two walls thus forming the side walls ofa yerticallyextending air space between the two sections. The air which passes through the grilles 1! travels up ward aroundall of the outer walls of the assembly and through the space between the two sections of the assembly 1 i I In order to provide for eflicient heat :transfer between the flue gases within the sections and the air outside the sections, the firebox section is prob erably provided with a pair of substantially yerti. cal baffles 52 placed one at-each side of the access opening, the battles extending. from the front wall 22 to the rear wall 23 and from the lower wall 21 to points spaced from the top wall so as to provide openings between the top of the baille and the top wall at each side of the space enclosed by the. .bailies. The baflies thus form a fire space within which thefiameand flue gases travel up ward and lateral flue spaces within which the flue gases travel downward into the connectors 51. A smoke outlet .53 isoprovidedcentrally ot the upper portion of the rearwall .32 of the radi ator sectlon l6 so that the two streamsuoi' flue ases travel through. the radiator section and unite while. passing through the smoke outlet 53.

In or-derto induce circulation through the sections when a fire is first lit and the furnace section are still cold, the lower irontcorners of the baiiies 52 areprovided, with openings .55 suchas by removing the corners of the home. some of the cold air in the bottom of the lateral flue sections is thus c e a e. d awn hrou h the open lugs 55 and recirculated back into the line open: ings by the inspirating' effect of the flame, Saba stantially immediately thereafter thefiue gases commence finding their way through the connectors 5l1and the radiator section 16. some of the flue gases will always 'recirculate through the openings 55, thus causing more uniform heating of the front Wa1l'22 and of the bottom well beneath the burner 42. The em ienc'y'or the assembly is thus greatly enhanced and distortion'of the walls of the section is materially reduced over what would be the case if the "openings 55 were omitted.

The device illustrated in Figs; 1 to '5, inclusive, is a gas burning space heater having the usual appur-tenances thereto, such as a draft 'divert'er 56 mounted on the smoke outlet 53. Hcweveryit is to be appreciated that other types-of burners may be mounted upon a suitably formed mounting plate 44 for attachment to the heat exchanger assembly comprising the -present invention. 'Itisalso to be; appreciated-that the substantially section spaced from the front wall of the radiator s'ectionto provide a vertical air space therebetween, a pair of substantially vertical baffles in said firebox section extending from the front wall to the rear wall thereof and from the bottom wall to points spaced from the top wall thereof, said baflles being laterally spaced from the center and the side walls of said firebox section t form a central fire space and lateral fluespaces, flue connectors extending rearwardly from the rear wall of said firebox section adjacent the lower portion of each of saidflue spaces to theiower corner of the front wall of said radiator section, and a smoke Outlet at the upper, central portion of said radiator section. V

2. A warm air furnace heat exchanger comprising a firebox section and a radiator section, said sections being formed as substantially rectangular enclosures comprising front and rear walls of substantially. the same size and 'side, top,: and bottom walls, said sections being horizontally and laterally alignedwith the rear-wall of the firebox section Spaced from the front wall of the radiator section to provide a vertical air space therebetween, a pair of substantially vertical baffles in said firebox section extending'from the front wall to the rear wall thereof and from the bottom wall to points spaced from thetop wall thereof, said baflies being laterally spaced from the center and the side walls ofsaid firebox section to form a central fire space and lateral flue spaces, flue connectors extending rearwardlyfrom the rear wall of said firebox section adjacent the lower portion of eachof said flue spaces to the lower corners of the front wallof said radiator section, and a smoke outlet at the upper central portion of said radiator'section-each of said baffles having an opening therethrough adjacent the lower, front corners thereof permitting recirculation of some of the flue gas from the flue spaces into the fire space whereby more evenly to heat the entire front wall of the firebox section I 3. ,A Warm air furnace heat exchanger comprising a firebox section anda radiator section, said sections being formed as substantially rectangular enclosures comprising front'and rear walls 'of substantially the'same size and side, top, and bottom walls, said sections being horizontally and laterally aligned with the rear wall of the firebox section spaced from the front wall of the radiator section to provide a vertical air space therebetween, a pair of substantially vertical bafiles in said firebox section extending from the front wall to the rear Wall thereof and from the bottom wall to points spaced from the top wall thereof, said bafiles being laterally spaced from the center and the side walls of said firebox section to form a central fire space and lateral flue spaces, flue connectors extending .-rearwardly from the rear;

wall of said-firebox section adjacent the lower abortion of each of. said flue spaces. to the lower its lower, front. corners cut away: so as to provide communication between'the lower,,front portions of. said flue spaces and said fire Space permitting recirculation-of ,someof the flue a from the flue spaces into th'e fire space whereby more evenly to.,heat the. entire front; wall of thefireboxsection.

said sections being formed as substantially. rectangular enclosure comprising front and rear walls of substantially the same'size and side, top, and bottom walls, said sections being horizontally and laterally aligned with the rear wall of the firebox section spaced from the front wall of the radiator section to provide a vertical air space therebetween, a pair of substantially vertical baffles in said firebox section extending from the front wall to the rear wall thereof and from the bottom wall to points spaced from the top wall thereof, said baflles being laterally spaced from the center and the side walls of said firebox section to form a central fire space and lateral flue spaces, flue connectors extending rearwardly from the rear wall of said firebox section adjacent the lower portion of each of said flue spaces to the lower corners of the front wall of said radiator 1, section, and a smoke outlet at the upper, central portion of said radiator section, said firebox section comprising a pair of substantially identical,

tray-like members each including an upstanding wall forming one of the first mentioned walls and pairs of opposed walls projecting from said upstanding wall toward the other of said members bottom walls, said sections being horizontally and laterally aligned with the rear wall'of the firebox section spaced from'the front wall of the radiator section to provide a vertical air space therebetween, a pair of substantially vertical bafilles in said firebox section extending from the front wall to the rear wall thereof and from the bottom wall to points spaced from the top wall thereof, said bailles being laterally spaced from the center and the side walls of said firebox section to form a central fire space and lateral flue spaces, flue connectors extending rearwardly from the rear wall of said firebox section adjacent the lower portion of each of said flue spaces to the lowercorners of the front wall of said radiator section, and a smoke outlet, at the upper, central portion ofsaid radiator section, said firebox section comprising a pair of substantially identical, tray-like members each including an upstanding wall forming one of the first mentioned' walls and pairs of opposed walls projecting from said upstanding wall toward the other of said members respectively forming portions of said side walls and said top and bottom walls, the projecting wall forming portions of one of said members and the corresponding projecting p ,r 1 1 a A ,war r. urn ce.;, iea e han er pom-. prising; ,a firebox section and a-, radiator section,

wall forming. portions ofitheother of said mem bers having their edges iabutted and joined,to-

,gether'throughout their extent,- and said radiator section comprising a third tray-,likemember substantially identical: etc; the tray likev members forming said firebox section. H c

.6: A-xwarmair furna'ce;, heat'exchanger .comprising, afirebox sectionand a radiator section, said sections being formed, as substantially recansular; closu es; c p sin f ont and r r walls of substantially the sameysize and side, top, and; bottom walls,,said sections being horizontaly; and. at ra ly a ned w he ear l of t e. re x: eq as aced fr m th -front wan of; th radiator section to provide a vertical air space therebetween, a pair of substantially vertical baflles in said firebox section extending from, the front wall to the rear wall thereof and from the bottom wall to points spaced from the top wall thereof, said bafiles being laterally spaced from the center and the side walls of said firebox section to form a central fire space and lateral flue spaces, flue connectors extending rearwardly from the rear wall of said firebox section adjacent the lower portion of [each of said flue spaces to the lower corners of the front Wall of said radiator section, and a smoke outlet at the upper, central portion of said radiator section, said firebox section comprising a pair of substantially identical, tray-like members each including an upstanding wall forming one of the first mentioned wallsand pairs of opposed walls projecting from said upstanding wall toward the other prising a firebox section and a radiator section, said sections being formed as substantially rectangular enclosures comprising front and rear walls of substantially the same size and side, top, and bottomwalls, said sections being horizontally and laterally aligned with the rear wall of the firebox section spaced from the front wall of the radiator section to provide a vertical air space therebetween, a pair of substantially vertical baffles in said firebox section extending from the front wall to the rear wall thereof and from the bottom wall to, points spaced from the top wall thereof, said baiiles being laterally spaced from the center and the side walls of said firebox section to form a central fire space and lateral flue spaces, fiue connectors extending rearwardly from the rear wall of said firebox section adjacent the lower portion of each of said flue spaces to the lower corners of the front wall of said radiator section, and a smoke outlet at the upper, central portion of said radiator section, said firebox section comprising a pair of substantially identical, tray-like -members each including an upstanding wall forming one of the first mentioned Walls and pairs of opposed walls projecting from said upstanding wall toward the other of said members respectively forming portions of said side walls and said top and bottom-walls, the projecting wall forming portions of one of said members and the corresponding projecting wall forming portions of the other of said members having flanges protruding from the edges thereof placed in faceto-face relationship and Welded to each other 4 I nave-eon throughout their extent, and said radiator section comprising a third'tmy-likemembersub.- stantiaily identical to the tray-like members forming the firebox section and a flat sheet haw ing its periphery welded to the fiangeof said traylike member throughout its extent, 1 t

8. A warm air furnace heat exchanger: compising a firebox section and a radiator section, said firebox section having one wall thereof adjacent to and spaced from the adjacent wall o! 10 said radiator section to provide a vertical-air space between said sections, a pair of substan-- tially vertically disposed baflles in said firebox section extending from said one well to the wall

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