Heater

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PetentedJune26,1945 2379018

UNITED sTATEs PATENT oFFicE 2.379.018

HEATE

McCoium execütrix o?sai? ?enry J,De N,

Appicaton December18,1943,SeralNo.514755

My invention relatesgenerally to heatersand housing ??Whichmaybe weldedtothe cyinder? ?nore partict?arlyto heaters of the Sealed com?

?Ustientype incorporating-anovelform of heat

f0,A hotwireelectrica1igniter 46 of conven tionalconstructionisarranged toigniteth8t p0r?

?t ?s an object of my invention to provide an 5 tion of the combustible mixture.which,dueto improved heater of the sealed combustiontype centrifugal action,tends to enter the igniter haying 8 Simple and efcient heat exchanger, housing through port é2 and fow therefrom ,?hichis Suitable foruSein heatingaircraft and through port ?3,The Suppy of energizing Cur? ?hich m8y be economicallymanufactured? rent fortheigniter ?6maybe controled byany Afurtherobjectistoprovide animproyedheat Wel1 known thermostatic switch completed Cir cuitso asto be de-energized when the heater 3xchanger havingprimary heattransfersurfaces attainsits operating tempezature? of large are8 and which may be manufactured ?y Simple manufacturing processes? The heat exchanger comprises a plurality of Afurther Objectistoprovideanimproved heat pairs of·generaly cylindrical sheets 5@?54, exCh&nger Which is light in Weight and which, 52?53,54?55,and 56?5??The Sheet 5?.haS ?hile made of thin sheet metal,is rigid and anelongated port6?whichregisterswithasimi Gürabie? - 1arport6 formedinthecylinder10,andissea? weldedtothecylinder 0 aroundthe ports 50,6?

Cther objects wilappear from the folowing Soasto be air-tight., - deSCription,reference being had to the accom panying draWings,in which:, “ In the manufacture of the heatexchanger by Pig?1 is a,central longitüdinai Sectional vieW 20 one method Which may be employed,the sheet taken on theine ??? of Fig?2; - 5í maythenbe placed overthesheet50andthe ?g.2 is a,transVerse sectional View taken On ofset end edges of the two Sheets then Seam the ine 2?2 of Fig,1;8md - Welded togetherto form two paSSageways 62,63 ?g,3is atransversesectionalviewtaken on (Fig.3)forthefow ofthe products of combus the ine3?3of Fig?1? , tionfrom the ports 60,61to a similarport 6& The heater comprises a sheet metal hollow formed byregistering openingsin the sheets 5? Cylinder 0 havinga,combustion air preheating tube ?2 extending longitudinaly,therethrough and52,thesesheetsbeingseamweldedtogether around the port 64?

Bnd Supported byfanged annular he8ds?and ??Anarrow annularbafe? issecuredinthe Inasimilarmannersheet53issecuredtosheet

Cyinder ? and divides the space within the sheet 5$around a.port 68?Sheet 5?is Welded 1atter into a primary combustion chamber?18 ,to the casing26aroundan exhaust port T0,&nd &nda SecOndaryCombustion sp8ce 2ö?Thetube a,suitable thimble T2,for COnnection With an ?2is provided with rows of perforations22 to 35 exhaustpipe,isweldedtothe Casing26? - ?ermit limited flow of air into the

secondary · By virtue of this arrangement of the sheets @he&ir for primary combustionfowsthrough the 50?5?,the productsof combustion wilfowfrom cyinder #0 to the exh8ust port 70 in the the fulilength of thetube?2?The1atter hasa drectionsindcatedbythearrowsin bend 2&formed integraliytherewith andisse fowis efectively through two passageways Fig.3?Theof ?CUred to the he8ter casing 26and to a pipe,28 p8rrowrectangular CrOSS Section,theSe paSSage? by & Sutable ?anged connection 3g?The pipe ???s Connectedtoacarburetor32,whichincludes waysbeingjointed

atintervals,at the ports 6?, 6?,?8and?@?Because of this arrangement the 3ö??uelissuppliedtothecarburetorthrougha 45 products of combustionwilfowequalythrough ??ye??? - the two alternative paths provided between the * ?he combustible?nixtüre of fuel and airsup successive ports 60?64,68,68,58and?0,andthe temperaturegradents alongthetwo pledbythe carburetorisconveyedtotheprimary combustion chamber 8 hrough an induction pathsWilbesubstantialythe Same? alternative ?üé???Thee?id0??he?ube ?? Within the Com? ?n the construction iluStrated,the SucceSSiVe bustion chamberhas &bendtoimpartaswiring pairs of sheets 50?5? are?equallygraduated in Imotion to?ne mixture,8s best shownin Fig.2? diameterso that Sheets 52?53 and ?6?5? are The cylinder 0 hasa pair of elongated ports concentric with the cylinder 10,while sheets ??,???ormedtherein,these portscommunic8ting ?????,5@?55,and the casing 26 areeccentric,

With sutable p8SSageways formed in aQigmter Suitable brackets??maybeprovidedt08id?

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8Upportlng the he8t exchanger assembly in the plurality of pairs of cyHndric818heet88urround? castng26? ingsaldcyHnder,each pair of8heet8belngJomed The heater may have its atr for combu8tlon atthetrendsand spacedtoprovide 8pa5S8geway andtheventlatagarsuppHedby°ra°orscoop betweenthem,8nd alternatepairsof sald8heetS connected to 8,shroud T68ecured to the c8Sing being eccentrically arranged and tangentialy 26?The venttlattng atr flows Iongitudnally joned tothe intermedatepairs ofsheets and to throughthe crescent-8haped passageways formed s8id Cylinder,S8idsheetsh8Vingregisteringports betweenthesheet850?6Tandcasing26? - atthe placesat Whichtheyarejoined,therebyto The sheets”50?5T are preferably made of 10 provide

a closed pathforthefow oftheproducts combustion from said cylinder to the outer

Stainles88teelin theorder of.028’”thicksotha?

they wU1eficlentlytransmit the heatfrom the mostpatrofsaidsheets,withthespacesinterme products of c0mbustion t0 the Ventilating air? aiate thepairs of sheets and said cylnderform? Stncethesesheets presentrelativelylargesurface ingpassagewaysfortheflow ofventlatngairid 8re88 in contact with the Ventiating air and adrectonlongitudnalyofsadcylnder? * heBtedgases,the heat exchanger may be made 15 2. A heat exchanger Comprising 8,plurality of Very8mal8ndCompactforanygivenrate of heat pairs of cylndrica1sheets surroundngone an transfer requirement? - other and of progressivelyincreasing dameters, While Thaveshown and describeda particular each pair of sheets beingjotnedattheirends and embodment of the tnVention,it wilbe 8pparent 8paCed to provide B,passageway between them, to those skiled in the art that the underlying 20 Bnd8lternatepairs0f Saidsheets beingeccentri prtnciplesthereof maybe employedin variations calyarranged andtangentialyjoined tothein &nd modfications of the 8pparatus dsclosed?? termedatepairsofsheets,saidsheet8havingreg? thereforedestre bythefolowingclaimstoinclude? istering ports at the places at Which they are Within thescope of myinvention al18uch modifi joined,therebytoprovide a closed path for the cations8nd varlations bywhichsubstantialythe 25 flow of onefiuidfrom theinnermostto theouter? results of theinvention may be obtained bythe? most pair of said sheets,With thespaces inter use ofsubstantialythesameorequivalentmeans? mediate the pairs of sheetsformingpassageways forthe fow ofanotherfuidinadrection1ongi

Iclaim:

1,A heater comprang a central cylnder tudn8lly0fsaid cylindric8lsheets.?

forming B,Combustdon 8pace,means to supply a 80 fuel and air for Combustion t0saidspace,and8 HENRxJ.DEN Mccounf