US2564479A

US2564479A - Forced circulation multiple unit air heating furnace

Info

Publication number: US2564479A
Application number: US827A
Authority: US
Inventors: George B Herbster
Original assignee: 8600 DENISON Co
Current assignee: 8600 DENISON Co
Priority date: 1948-01-07
Filing date: 1948-01-07
Publication date: 1951-08-14
Anticipated expiration: 1968-08-14

Description

1951 I G. B. HERBSTER 2,564,479

FORCED CIRCULATION MULTIPLE UNIT AIR HEATING FURNACE Filed Jan. 7, 1948 2 Sheets-Sheet l O lll llllllll II II ll 2 I lIIIIlllllllllllgggmnna" INVENTOR. GEORGE E HER56 TE)? AWOIQ/VEYG,

Aug. 14, 1 5 G. B. HERBSTER FORCED CIRCULATION MULTIPLE UNIT AIR HEATING FURNACE Filed Jan. 7, 1948 2 Sheets-Sheet 2 INVENTOR. 650/865 5. HEP/3575B ..tion of their extent.

Patented Aug. 14, 1951 TED STATES PA-TENT o-F erce FORCED CIRCULATION'MUIZTIPIQEUN IT "AIR -HEATING FURNAGE 1 George-1L Herbster, Cleveland;.0hi0;sassjgnor; by mesne assignments, to 8600,-.Denison,Company, Cleveland, Ohio, a corporation of ohio AppliczitionJanuary 7,194 s riamorszr .'.8 Claims. ll AThis invention relates toa heater and is an improvement, on, the heater disclosed and claimed in myzco pending.applications Ser. No. 663,506, ,ifileid April 19, '1946,-which application is "now aabandoned andSeru-No. 787,455, filed November "2 1, 1947.

,lIIl-JihflifilSt of "said: applications, therelis ,des- ,.cribed;. ,,a-, heat ,exchangervcomprising a plurality qo'f, annular ,heads arranged in "a row I in spaced rface to facerelation from eachiother to definejanz axialzcentral.passageand to define between v the; heads radial passages connected at their inner ends with the central passage. and open l at} their .outer .ends throughoutlthe' greater porcentrifugal radial discharge .blower -is arranged jzin .the central passage and receives air from b,oth- ..ends and .dischargestitrradially of the heads through the radial passages into an enclosing wasing. ,In that -.structure, there .is va tendency,

ffor the, air discharged from the heads to. swirl about the .axis of the tcentral passagedn-lthe iradial passages ,anduin the interior of the ,casing with the ,consequentlossaof eflicency in thevol- .urne'of air discharged, from theca'sing .into the space? to be; heated.

" In my co pending application, Ser. .No. 787,455, the/casing rislmodifie'dufromthat of the earlier xapplicationto. provide "a spirally expandingpe- -=air impeller socombinedtherewith as to provide foran efficient and "better balanced-flow 70f air "in a-large volume in heat exchange -relationto the heat'exchangerand from the heat exchanger "into'the space tobe heated.

f'Other 'objects and advantages will 'become ap- "parent from the following description wherein :r'eference made "to the drawings in which:

Figs-1 is-a side elevation of==a' heater embodying 'the" principles of the present invention;

-Fig. 2'is'a horizontal sectional view of the heater taken on the line 2- -2"=in-Fig.1;

Fig. avertical section view of" the heater takenon line 3-' 3---o'f Fig. 1.

A rotary impeller of a Re'ferring tol liiga 1, .2, ands-l3 'the't-heatericomprises a heat exchanger whichiis spneferably formed of-a p1ura1ity-of annular'heat exchange heads I 'varranged in-arow in'axial alignment in spaced face to' facerelation to each-:otheraso as to define central passage 2 and "radial; passages '.:3'- which' connect: attheir inner endszwit-h the passaget'2 and'are open attheirxouterpends.

As morej'fully described in my'abovetsidentified too-pending"applications, each of the heads I ;-has 25a combustion chamber portion-Wand stack-sportion '5, the .former rof which is open at its lower end into.:a burner compartment-6. A" gas burner I sisrarranged in the ,compartmentjG 'and; hasa,

iplurality .of head rportions -whichdischarge into thercombustion chamber portions 4; respectively,

-' of the heads" I Oil burners-likewise may :be: used. Thus, each head, including its combustion-chamber portion .4; and: stackportion; 5 is spaeedflatwise of" the heads-from the heads adjacentthereto :;overgthe entire extent of its side-wallsso that, :except lfOI -a slight-blocking 'by the burnertcompartment top wall and bytheaccumulatinghead forthe stackport-ions, the radial passages formed between the headsrare open, fully to "the atmosphere at theouterperipheries of the :heads for iltheir entirelperipheral extent.

The heater heads I. .are enclosed-in a: suitable casing. '8 which-preferabl-yyhas-a spiral peripheral wall-9,-and.outlet I 0- such' as described in myrcopending application Ser; No. 787,455. Thecasing .l8ihaszendwalls- I I which are spaced axially, from -the,outermost. heads lot the row of headsland have central openings I2 co-axial Withthe-central passage! but of less diameter lthan'the passage v2.

.Mountedonthe side walls of the ..casing.= are ,suitablewbrackets l3 whichrsupport, a rotatable shaftv I4 drivenby; means .of a pulley vl5, ,beltl 6, .and. motor I1. .Mounted on the. shaft I4 between vadjacent heads I and betweentheend heads of the row andtheadjacentside ,wallsII aresectionso'f arotary, centrifugal radial discharge .iblower-iimpeller. .Since each, of the impeller sections is the same in form andfunction, one only wilLbe described in detail.

iAs illustrated in Fig. 2,7the impeller section at "the extreme-right comprises ahub I8 mounted on theshaft M .for rotation therewith and a suit- ;able spider'IS'to the outer ends of which "are connected a'plurality-of impellerbladesZU. f The impeller bladespreferably are arrangedjgenerally -;paralleltothe axis or the shaft Idand'are spaced apartcircumferentially g in the usual manner so =that upon*rotationp-air is drawn in axially of the impeller and discharged"centrifugally radially therefrom. The impellers between adjacent heads are similar to the impeller described except that they are slightly shorter and all impellers are preferably of the same diameter. The extra length of the impellers between the walls II and the end heads of the row is provided due to the fact i1that they must initiate any inward flow of a Usually when such impellers operate to draw in air from an adjacent air mass which is relatively static, the first inch or so axially from the inlet is not as eiiective for drawing in and discharging air as is the remainder of the length of the blades because the air is already in motion axially of the impeller as to said remainder of the length of the blades. Consequently, the blades 20 inwardly, axially of the impeller from the ends of the impeller may be shorter than those blades which are at the ends of the impeller as generally the air is already in motion axially of the impeller when it reaches the planes of the radial passages between the heads.

It will be noted from Fig. 2 that the impeller blades are closely confined between the heads and between the side walls and adjacent heads so as to prevent a return of air toward the axis of the impeller sections around the ends of each impeller section. Furthermore, the impeller blades are spaced outwardly beyond the major portion of the radial length of the heating heads so that the air drawn in by the impeller sections is caused to pass into heat exchange relation to the heads before it reaches the blades except for the radially outermost extremities of the heads. Due to the much larger diameter of the impeller relative to the heads in the present form of the invention, as compared to the form shown in my co-pending applications, the impeller may be rotated at considerably slower angular speeds for the same volume of air, thus reducing vibra tion and also reducing eddy-currents between the heads. In fact, the volume of air delivered is very greatly increased over' that obtainable with equal size heat exchange heads using an impeller of the diameter of the central passage Thus a better balance between heat exchange surface, volume of air and time of exposure of the air to the surface is obtained.

The impeller sections provide an impeller means between the axis and blades of which the major portion of the heat exchange means is disposed. The structure above described is particularly suitable for space heaters and central furnaces.

Having thus described my invention, I claim:

1. A heat exchanger and blower combination comprising a plurality of upright substantially annular disc-like hollow heat exchange heads arranged in a row in axial alignment and spaced face to face relation and defining a central axial passage with generally annular radial passages between adjacent faces of the heads and connected to and radiating from the centralpassage, each of said heads having a combustion chamber portion at its lower portion and an exhaust portion at its upper portion, said combustion chambar and exhaust portions of each head being spaced apart endwise of the row from the corresponding portions of adjacent heads and each head having at least one passage extending clockwise, and at least one passage extending counterclockwise about the central passage from the combustion chamber portion to the exhaust portion, rotary blower impeller sections coaxial with the central passage and extending radially outwardly from the central passage into said radial passages, respectively, and arranged to receive air axially, and means supporting said sections for rotation about the axis of the central passage.

2. A combination according to claim 1 characterized in that each of said sections has a plurality of impeller vanes spaced radially outwardly from its axis of rotation nearly to the outer peripheral limits of the heat exchange heads.

3. A combination according to claim 1 characterized in that said heads have annular wall surface portions disposed close to the ends of the sections for constraining air passing between adjacent heads to pass between the end limits of the impeller section which is between the heads.

4. A heat exchanger and blower combination comprising a plurality of upright generally annular disc-like hollow heat exchange heads ar ranged in a row in axial alignment and in face to face spaced relation and defining a central passage and defining between adjacent heads radial passages which are connected at their inner ends to the central passage, each of said heads having a combustion chamber portion at its lower portion and an exhaust portion at its upper portion, said combustion chamber and exhaust portions of each head being spaced apart endwise of the row from the corresponding portions of adjacent heads and each head having at least one passage extending clockwise, and at least one passage extending counterclockwise about the central passage from the combustion chamber portion to the exhaust portion, a casing enclosing the heads and having a front wall and rear wall spaced from the ends of the row of heads, respectively, said walls having air inlet passages aligned with the central passage, centrifugal blower impeller sections in the radial passages, and between the end heads of the row and said walls, respectively, said sections being coaxial with the central passage and having their outer peripheries radially outwardly beyond the inner periphery of the heads, means supporting the impeller sections for rotation about the axis of the central passage, and said casing having a discharge opening spaced from the inlet openings.

5. A heater comprising a plurality of upright, substantially annular disc-like hollow heating heads arranged in a row in axial alignment and flatwise spaced relation to each other and providing a central axial passage and generally an nular radial passages between adjacent heads and leading from the central passage and open at their outer limits, each of said heads having a combustion chamber portion at its lower portion and an exhaust portion at its upper portion,

the said combustion chamber and exhaust portions of each head being spaced apart endwise of the row from the corresponding portions of adjacent heads, each head having a plurality of passages therein extending circumferentially of the heads in opposite directions from its combustion chamber portion to its exhaust portion, burner means to supply combustible media into the combustion chamber portions, rotary impeller means coaxial with the central passage and including circumferentially extending rows of impeller blade portions in alignment radially with the radial passages, said rows of blade portions being coaxial with the row of heads and disposed radially outwardly from the axis at least beyond the inner periphery of the heads.

6. A heater according to claim 5 characterized in that the blade portions are between the heads.

7. A heater according to claim 5 characterized in that said impeller means includes a rotatable shaft coaxial with and extending into the central passage and supporting means for the blade portions carried by the shaft and extending radially outwardly through the radial passages.

8. A heater according to claim 5 characterized in that said heads are imperforate between their inner and outer radial limits.

GEORGE E. HERBSTER.

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

Number Number 6 UNITED STATES PATENTS Name Date Le Grand Sept. 20, 1932 Redfield Nov. 5, 1935 Cummings, Jr. Apr. 22, 1941 Bergstrom Mar. 10, 1942 FOREIGN PATENTS Country Date France May 8, 1923