US1915688A - All steel hot air furnace - Google Patents

Description

June 27, 1933 F. H. MILLER ET AL ALL STEEL HOT AIR FURNACE 4 Sheets-Sheet 1 Filed May 25, 1931 m T M V J T ATTORNEKS June 27, 1933. F. H. MILLER ET AL ALL STEEL HOT AIR FURNACE 4 Sheets-Sheet 2 Filed May 25, 1931 INVENTORS A TTOR/VEVJ June 27, 1933. F. H. MILLER ET AL ALL STEEL HOT AIR FURNACE 4 Sheets-Sheet 5 Filed May 25, 1951 Z .Y B

JOAMTJW ATTORNEYS June .1 F. H. MILLER ET AL ALL STEEL HOT AIR FURNACE 4 Sheets-Sheet 4 Filed May 25, 1951 FIG; 6.

3 wi'thpartof thefront wall removed.

5 F1gure 3; I

Patented June 27, 1933 FRANKLIN H. MILLER 'A'Ni) YWJ-FIILELI'IAM EM; snorrivnn, on payroll; o rro A p ilieati o'n fiiee' ma 25,1931; swarm. 539,776;

- This invention relates'to improvements in furnaces, and hasforits object to pro'vide an improved, all steel hot air furnace.

It is particularly the object of this inven- 5 tion to provide anfall steelhot air furnace in which there iswan external case within which is located a heating chamberor drum,. t g

I 'j-The tOPJSlIlCllHQd mwardlyto'wardthe which has thereinf'a removable grate mem'-. ber.

so that a current? of. air-and gases imayv be 7 maintained without causing an undue un-z; necessarycombustion ofthe fuel in the. furnace and on the grate.

combustion chamberforproviding agas passageway. for heating thea1r 1n the air chamher as itrises. This gasjpassageway i .7 formed so'thatitwillofferzthe'least'resistance and an open1n'g'8 forthe admissloniof fuel: and removal of ashes and for-the purpose of draft, the case is of one continuous solid to vthe rising air, in the air Chamber and. form the greatest amount-of contacting surface for the air whereby itmay be more readily and completely heated.

3Q These and other advantages will appear from the following description taken in con nection with the drawings.

Referring to the drawings: 7 Figure 1' is a front elevation of the furnace Figure Qflis a Vertical section through the furnace showing the'relative positions of the 7 case and the combustion chamber-located within the caseand-the-air chamber between the case and the combustion chamber;

FigureS is a sectionon the line 3 3 of Figurel. 7

Figure 4 is a section on the line ,of

Figure, 5.is a view similar to Figure 2 showing the upper end ofthe case, With'theheatingflue inreverse positlon tothat shown.

in Figure-2;

7 Figure 6'isa View showing detail there movablegrateunit. 1 a

It is also an object of this inventionto pro-. vide, in connectlon wlth an a1r furnace, means; to admit air into-the furnace abovethe grate' withflues, later to be described.

The furnace is more or 'lessrectangular in i :shape,=and has a front wall 1, side walls'2,\aback 3, abottom 4 anda top 5., all composed of sheet metal'and so united that there is an 5 all steel'caseflforming the outer, walls o-f'an 5 air chamber and supports for a combustionchamher and grates.

ingg'air in 'the chamber' towardgthe outlets a i i for the hot air in. the upperend'of theychamber. These outlets; are indicated by the nu-' meral 7 aildmay be any number. In Figures l and, 2 theoutlets are'shown. In'ord'erzto at the lower or bottom end of-the case; The". inlets and outlets may be. used for the-recirculation'bf air 'fromthe, room, through case-land" back into the room, or they may-be supply fresh air. there are provided inlets 6 through the. outlets.

' With the exception of the outlets and inlets L of they case. It is substantiallyrectangular in shape and has a rear wall 10 andside walls 11. i The rear wall slopes upwardly andtoward the front as indicated by the numeral 12, and passes into a downwardly inclined part 18 of thefront wall of the firesbox and drum." This construction of the fire box is well illustrated in Figure 2: v v At the extreme upper curved end of the fire box and drum are two outlet openings 14, which serve as-draft holes andcommunicate Around the front of the fire box and drum is a frame 15 suitably attachedto the front wall 9 by means of rivets, bolts or other suitable meansv This" frame has. three openings-therein. The lower closed by an ashdoor 1,6, in which there is a opening,- next to :the bottom of the case, is

20, while on the door 19 this slide is indicated by the numeral 21. These slides are for the purpose of admitting air into the drum part of the fire box, or that part of the fire box above the combustion chamber. I

The openings or outlets 14; pass into arms 22 of a- U shaped heating flue supported around the upper end of the fire box and drum. The open ends of this tl-shap-ed heater project through the front wall of the case, as indicated in Figure 1, and are closed by doors 23. These doors are for the purpose of enabling the removal of ashes and Cinders and other solid material that collect in the heating flue.

In the arm of the heating flue. adj acentan opening 14: is an inlet opening 24 in line with the opening 14:. Between the sides of the fire box and drum and the adjacent sides of the arms of the heating flue is a pipe 25, which has on each end a flange 26. This pipe fits around: the holes 1st and 24with the flange against the walls. Opposite the pipe and at. tach-ed to each of the-walls 11 and the inside Wall of each arm of the heating flue is a ring 27 These rings are fastened to the flanges 26 by means of rivets or any other suitable means. i The relative positions of the, parts are shown in Figure 3.

The hot air and gases rise from the com bustion or fuel chamber, pass into the upper part of the combustion chamber or drum, and out through the openings 14 into the arms 22 of the heating flue. The closedend of the U- shaped heating flue is enlarged, as indicated by the. numeral 28, and has extending outwardly therefrom an outlet opening 29 which leads into a stack or flue by which the draft is produced. Adjacent the outlet 29 is a trap 230, closed by means of a door 31. The p'ur pose of this trap is to catch ashes, cinders and other solid material that may be carried.

along with the gases and the hot air passing from the combustion chamber.

The U-shaped heating flue may be arranged in a reverse position to that shown in Figure 2 and in the position shown in Figure 5. As shown in Figure 5, the trap 30a extend-s upwardly and may project through the wall of the case adjacent the heating flue, or a pipe 30?) may be attached to this trap and extend across the uppere'nd of the'case and out through thefront wall thereof,- above the doors. Tn either event, the smoke stack or smoke flue is attached to the outlet end of the trap 30a. When the trap 30a is used for forming part of the draft channel the opening 29a is used for cleaning purposes and may beclosed by a door similar to that shown in Figure 2 and indicated across the top of the case but within the case,i

there is an increased amount of heating surface over which the air passes beforeleau ing the. air inlets, thereby increasing the" heating effectof the furnace. By arranging the heating flue in the position shown in" Figure 5 not only is .the heating area increased but means is provided for attach I ng the outlet fluein another positlon so" that the furnace may be more readily and satisfactorily adjusted with relation to the parts of the room or basement in which it is located. i

Figure 6 shows a. plan view'of a removable grate unit adapted .to be used with the furnace described herein. This grate unit may be placed in and removed from the fire box through the fuel doors For supporting the grate unit the fire box has suitable'ledges for seating the frame 32a of the grate; This frame is flat and rectangular in shape haw ing vertical grate supporting flanges 32.

The grate is a removable-grateand hasend a trunnion 3 1 which fits in a'notch 35" inv the upper edge of one of theside flanges 32.

Each grate has extending downwardly therefrom an arm 36, and attached to the lower end of each arm isa link 37 which-extends out through the front of the furnace. The outer end of this link hasattachedthera to the lower end of a lever 38, pivoted intermediate its ends at a point 39 so that by operating the" lever the grates may on their trunnions. V j

As shown in Figure 2 the grates are in a horizontal position, but by operating the le ver 38these grates may be tilted so that ashes, clinkers and the} like accumulated thereon may be dumped in the ash chambe ribeneath the grates. Associated with the fire box and cn'eac'h side of the grates is a protecting wall be rocked edge of the fuel admission door a ledge 41,. which tends to divert the rising gasesandheat from the door above the fuel admission door.

a great amount of circulation of gases is desired Without increasing the amount of fuel gases burned, the slide door in the door 19 may be opened'so that air is admittedinto the upper" part of the drum or combustionchamber. This air coming '11 through this door contacts 'Wlth'tllfi r sing gases from the fueland becomes thoroughly mixed with these gases, due to the restricted nature of the opening through whichjthe gases and air i pass. Not only is there an added quantity of gas for circulation and, heating purposes- Without an increase in the combustion. of v I sheet steel fire box and drum in sa d case fuel,-but if any unconsumedjor unburned may be rising'from the fuel on the grates tlns gas, onaccount of the excessive be consumed, thereby ,creating' a greater amount of heat .Without increasing the;

amount of fuel burned} It frequently happens When an insuflicie nt amount of air is admitted to burnin fuel that carbon monoxide is produced, and Lin-,-

less burned Will pass into the air Without bemg consumed, but if the proper amount of air is added at theproper time and place this top, a U-shaped heating fiue in said case with ga'swill be converted into carbon dioxide, thereby increasing the amount of-heat Without increasing the amount of fuel consumed. The taking in of the air is due to injector effect due to the rising gases in the combustion chamber or drum. 7

We desire to comprehend Within our invention such modifications as may be embraced Within-our claims and the scope of our invention.

c ,Having thus fully describedour invention,

what We claim as new and desire to secure by Letters Patent, is: a a

1. In a furnace, an integral sheet steelcase having air inlets and air outlets, an integral sheet steel fire box and drum in said case formingtherewith an air chamber,the side Walls of the drum front and rear Walls of said drum converging to form the top of: the drum, and a heat flue in said air chamber connected to opposite,

sides of the drum adjacent the top thereof. H

2; In a furnace, an integralsheetsteel case having air inlets and outlets, a'hea-tiiig chamberin said case forming'with the case an air chamber, said heating chamber having vertical. side walls and upwardly and inwardly inclined front and rear walls forming a curved I its arms on opposite sidesof and connected WVhenever the furnacce is in operation and to the flue above being vertical and thetures.

to theheating chamber adjacent thetop and the walls of the case, a cleansupported by ing .door in each arm outside "of, the case, and an outlet from said heating flue through the back'wallof the case. i

having air inlets and air outlets, an integral sheetsteel fire box and drum in said case forming therewith an air chamber, the side 'Walls of the drum being vertical-and the front and rear walls thereof converging to form the top .of the drum, a heat fine in said air chamber connected to opposite sides of the drum adjacent the top ther.eof,said flue having an outlet through the back of the case and a trap connected tothe'fiueadjacent the outcas'e. I

. .4. In a furnace, anintegral sheet metal case- 1 having air inlets and air outlets, an integral 3. In a furnace, an integral sheet metal case; I i

let and extending through the back of the] forming therewith anair chamber, the side e the back of-the case, and a'trap extending from the flue through. the back beneath, the finer, e a

5. In 'a furnace a sheet metal'case having air'inlets and air outlets, a sheet metal fire box :and drum in said case forming therewith an air chamber, the side Walls oft'h'e drum beingvertical and the, front and rear Walls *the'reofvconverging to form the top ofthe drum,a heat flue in said airchamber connected to opposite sides of the drum adjacent the top thereof, said flue havinga clean-outv opening extending through the back of the case, and adraft pipe connected at one'end the clean-out opening and having, its other end extending through the front Wall of the case.

6. In a furnace, a sheet metal'case having airinlets and air outlets, a sheet metal fire box and drum in said case forming therewith an air chamber, the side Walls of said drum beingvertical and the front and rear Walls drum, a U-shaped-heat flue insaid aircham- :front wall of the case, a cleaning door in each arm,and a draft pipeconnected at one end to the rear end of the U-shaped flue'and extending through the front Wall of the case,

In testimony whereof, wfe, affix our signa .FRANKL IN H; MILLER. 1

I WILLIAMM. snorrnnn; :1

115 '1 thereof converging toform the top of the

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