US828898A - Downdraft-furnace. - Google Patents

Description

PATENTED AUG. 21, 1906.

H. F. NORWOOD. DOWNDRAFT FURNACE.

APPLICATION FILED AUG.4,1905.

' W In ventor:

Uni-rein stares PATEET cleric-n.

HORAGEFF. NORM'UOI), OF CHELSEA, MASSAUl-IUSE'VFS.

DOWNDRAFT-FURNACE.

Specification of Letters Patent,

Patented Aug. 21. lJtG.

Application filed August4,1905. Serial No. 272,648.

To 11]] whom it may con/0 77p:

Be it known. th J) I, HORACE F. N ouwoon, a citizen of the United States, residing at Chelsea, county of Suffolk, State of Masse-- chusetts, huvcinvented certain new and useful Improvements in Downdraft-Furnaces,

plete combustion takes places, which furnace is simple in construction, is composed of few parts,-is ver ycompzict, not apt to get out of order, is easilyeontrolled and regulated, and readily supplied with fuel.

In the accom anying draw ngs, in which like letters of re erence indie 2e like perts in all the figures, Figure 1 is a plan View of my improved'furnuce, the draft-adjusting ring and hopper being emitted. Fig. 2 is a plan A and B, formed of tubing,the coil Abeing of less diameter than the coil B- and located within the coilB so as to form a space C between the inner and outer coils A- and B,

which space will he referred to hereinafter as the fuel-space," said coils in the specific A end B, forming the coils A and B, project from the furnace at the bottom and are to be connected with a suitable supplv of water,

and the upper ends A and ll'tof these tubesor Pipes (an be carried i the dome of a steum-boiler, which boiler is heated by means of the comlmstiou iri the furnace, or the hot water issuing from the-ends A! end B may be used. for uny other suitable pury pose or may go to waste, us the exigencies of the case may require. As shown, the several convolutions. of the pipes do not rest firmly upon each other, but an open space equal to about one-fourth, more or less, of the diumctor of the tubes-forming the coils is left between the several com'olutions. The bottonrini f the innercoil A is also some distance beneath the bottom of the outer coil 15. These coils are contained in erasing l), preferably made ofwrought irou and of such di- :uneter as to leave an air-spnrzc E between the well of the casing and the outer face oi theoute'r coil B. able base F, upon which busithe lourrcuds of the coils A and B rest. base has upwardly-cXtcndirig" side portions ll, which support the mine iii-ultheouter coil B, thus leaving a spar-15H between the bottom of the outer coil B and the upper sur' face of the base F. Openings lnrc provided in the (lXiZGYISlOIl'G of the 'l-i'itfifl'l, which openings can be closed by doors or by brick or burnt-clay plates l. The ashes accumulate around the inner coil A an i may be removed from time to time after the openings l have been opened; but after the ashes hare been removed these openings z rc to be closed. A cast stop-plate J rests upon the top of the casing above the coils and is pro ided with acentral opening K, from which draft-lube .li extends upward for the purpose of conducting the products of combustion to the boiler or a. furnace for limiting meial or a kiln or to any other structure in which the heat is-to be used. The central opening ii is surrounded by e series of segmentalopenings M, formed in' the top plate J, andat the out-er edge of these openings at hopperN,surroundinn the central tube L, is secured on the plate .l.

Along, the outer edge of the top plate J a series of radial openings are formed around thecntire top plate. A flat metal ring 1 rests upon the upper surface of thetop plate J along the rim, and this ring P is provided with openings Q of the same size as the opt-riings O in the top plate J and adapted to register therewith. lhis ring rrsts ii at upon theupper Surface of thetop plate and is ed: ted to turn upon this top plate and is held turn by means of pins R, projecting upward from the u ipcr surface of the plate J. the outer 0 go of the demper-riiigQl two pins 0 project upward from the same and two pins .1; project upward frorn'the top plate J at the This casing rests on a suit shown, lhc

in place in such a manner that it can.

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inner edge of the ilninper-ring,sotlint n vbur M Sean be insertril. l)(-:l,\\'((?l1 the two pairs oi pins a enud I) l). ns shown in Fig. 2, and the damper-ring shifted, so s'lo cause the openings in the top plate J nnd'the open ings Q in the lmnpenring I to register co1n= and B, at the bottom of thefurnace, may be vconnected by dpipe A, if desired. The fuelis filled into tliQhOPPL-QI' N and passes from thesemethrough the openingsM into the space 0 between theycoils Aend B, down- Whieh spaoe'it is passed'until the space is filled, emits the fuel is consumed-new fuel eontinuelly supplied automatically froin the hopper at the top,

The air required for ,(zombust-ioh enters the top of the furnace throughthe openings 0, passes down through the 'air spaee E; surrounding the outer coil, and possesthroughthe openings between the several oonvolutions of. the" outer coil Bin'to and through the fuel, and the combustion ta esplace in the'space bounded by the inilf A, in which space there is 110 fuel. products of combustion-pass outthrough 'tlie'topopeniiigs K; and are carried oil by the duel); The Water circulating throu 'h the pipes or tubes forming the coils A all (1 33 prevents those pipes being consumed by the extrenielyg teat heat, and :it; thesaine time the Wat is heated :i'nd is converted into stenn'i to be used'innny siiiitoble manner; as my be (It-sired;

described niy inven'timr, what I 1 claim asfinew; turd des reto' secure by Letters If 111E118downdraft furnace, the combinetion "with an; inner tube-coil and an outer tubecoil speced 'therefrom to forlna fuel-:- chember, of st easing surrounding the'eoils enddraving fuel-supply openings irbove the 1 space between the two coils an opening for the escape 'nfthe pfoductsiof combustion above the inner eoil and air-supply openings above the space between the walls of the dosing and the} outer coil, substantially as set fO'Ithlj v p p 2, Info doiivndreft iuiimce, the combine tion with 1m inner tul-ie-eoil andv an outer tube-coil spacedtherefrom to forni 1 fuel a chamber between them, of a casing surroundingthe coils and having an 0 ening for the escape of the products of com ustion above the inner coiland also rovided in its top with=draft-openings leading to the space hetween the outer coil and the Walls of the case ing and means for regulating the size of the draft-openings, substantially as set forth.

Inn downdraft furnace, the -c'o1nbination withan inner tube-coil and an outer tube-coil spaced therefrom to form a fuelch'ainberbetween-them, of a casingsurround- 'ing the coils, stop platoon said casing, an

openin in saiditop' plate abovethe central coil a no extending frolnsaid opening upward, openings in the top plate above the space between the inner and outer coils, fuelsupply openings in'thetop late and ti-hopper on the top plate surroun ing'saidop'cnings and thefiue, substantially as set forthi ,4. In a downdraftfurnace, the c'o'mbina tionwith a casing, oftwo apertured .ehamhers-within the "casing, one chamber being- Within-the other and the chalnb'ers spa'ccd from each other-toform ai'ifuel-chaniber bev I tween them, the-walls of the outer ohaniber being inclined downwardand outwardzi'nd the Wells of the inner: chember bein inclined downward and inward, sub'stantia 1y asset forth.

'5. In a downdraftfurnace, the combina tion with two apertnzed'walls, one a surrounding the other,seid-wallsbeing spaced to form a h1el+cl1iunber between them, the

diameter of the inner wall gradually inert-as v ingfroni the botton to the top and'the dianieter of the outer wall gradually decreasing I "from the bottom to the top, of a casing surrounding said Walls and )rovided with draftopenings andiilso prov! ed with fuel supply openingsat the top of the spa e between the Wells :a-nd'with an outlet-owning for theprod uots of combustion above the top of the innerl'wall, substantially as set forth.

'6. In .a downdraft-furnace the combinetion with two eperture'd clnnnbers', both resting-on a common base and one surrounding the other; the diameter of the inner clu'un ber" decreasing from the downward 'and the diameter of the outer chamber increasing; from the top downward and an outletflue at the top of the inner chamber, substantielly as set forth. I 4 1 p In testimony whereof I have signed my nonie to this specification iii-the presence of two subscribing witl'iesscs.

. omer? F. ronwoonl Witnesses: v

Os'oA z -F.'G sz,

Sour-rm 3L BAEDER.

I ls:

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