US2561479A - Hot-air furnace construction - Google Patents

Description

July 24, 1951 c. E. OLSEN 2,561,479

HOT AIR FURNACE CONSTRUCTION Filed Sept. 27. 1948 2 Sheets-Sheet l July 24, 1951 OLSEN 2,561,479

HOT AIR FURNACE CONSTRUCTION Filed Sept. 27, 1948 2 Sheets-$heet 2 jazz/Zia CWazae 5,1949%? Patented July 24, 1951 UN! TED STATE S PATENT OFFICE 2,561,479 HOT-AIR FURNACE CONSTRUCTION ClarenceE. Olsen, Minneapolis, Minn.

Applicationfseptember 27, 1948:, Serial No. 51438-1 it Claims. (Q1. 126-406).

Referring to the accompanying drawings, wherein like characters indicate like parts throughout the several views:

Fig. 1 is a front elevation of my novel furnace, some parts being broken away and some parts shown in section; and

Fig. 2 is a vertical section taken substantially on the line 2--2 ofFig. 1.

Referring with greater particularity to the drawings, the numeral I indicates in its entirety anexternal casing or jacket: comprising front and back walls 2 and 3 respectively, sidewalls 4, and a top wall. 5.. Extending between the front and rear walls 2 and 3 respectively are a pair of upstanding flanges 6 which are spaced from each other and from the side walls 4 and which define the side walls of a fire box I and an ash pit 8 which are separated by a conventional grate structure 9. Fire box I and ash pit 8 are accessible through doors I and II respectively secured on a supplementary front wall element or plate I2.

Spaced inwardly from the side walls 4 and top wall 5 and extending between front and rear walls 2 and 3 respectively is an inverted U- shaped baflle I3. Preferably and as shown, the jacket I extends to the floor; whereas, the lower ends of the bafile I3 are spaced from the floor but are inturned as indicated at I4 to make sealing connection with opposite sides of the opposite flanges 6, as indicated at I5. Itwill be noted that the connections I5 of the baffle I3, to the flanges 6, are preferably below the lower limits of the fire box. The side walls 4 of the jacket, a portion of the front and rear Walls 2 and 3, and the top wall 5 define the outer wall of a heating chamber, indicated by the numeral I 6; whereas, the bafile I3 defines the inner wall of said chamber.

Also extending between front and rear walls 2 and 3 in spaced relation to baflle I3 is an inverted generally U-shaped tubular member I1,

2. which straddles the fire box I with the legs I8 thereof being in spaced relation to the baffle t3, the lower end portions. I4 thereof, and the flanges 6. The space intermediate the fire box I and the inner wall I9 of the tubular element I'I defines a combustion chamber A. It will be observed that the inner wall I9 of said-v tubular element I1 guides and deflects the gases of combustion outwardly and downwardly through. the

passage to a point below the fire box 1. It, will also be observed that the outer wall 2! of the tubular member I? forms the inner wall of a smoke passage 22 formed therebetween and the inner wall of the baffle I3. An outlet 23. connects the passage 2'2 to a smoke stack, not shown.

The tubular element I1 is in reality a heating chamber. In fact, it is the heating chamber I, from which the greatest amount of heat. is derived. Referring particularly to Fig. 2, it will be observed that the tubular element or heating chamber I1 is connected at its opposite ends to suitable conduits 24 through the medium of segmental headers 25'.

Also preferably and as shown, I provide a transverse tubular element 26 which projects through the upper portion of opposite legs I8 of thejtubular element I1 and through the upper most portion of the combustion chamber A.

The tube 26 is provided at its central portion with a damper 21 which may be opened to permit direct communication between the combustion chamber A and the opposite sides of the smoke passage 22. This arrangement is for precautionary purposes, and satisfies laws present in certain communities prohibiting pockets for the accumulation of gas. It should be obvious that when the damper 21 is opened to any extent, gases accumulating in the combustion chamber A will be allowed to escape through the tube 26 to the smoke passage 22.

When it is desired to use my novel furnace in a forced air system, the warm air is drawn off from the chamber I! through one of the ducts 24, as indicated by arrows in Fig. 2, and is returned through the other thereof. It will be noted that the air within said chamber I1 is heated by the gases of combustion in their travel upwardly into the combustion chamber A, downwardly against the inner wall I 9 through passage 20, and upwardly through the smoke passage 22 and through the outlet 23 to the chimney, not shown. To fully recover the heat which is transferred to the baffle I3 in its travel upwardly through the smoke passage 22, I provide a suitmanipulation and adjustment of the damper 21 through an aperture 32 in the front wall 2.

I provide suitable clean- out openings 33 and 34 in the front wall 2 for communication with the top and bottom portions respectively of the smoke passage 22. Openings 33 and 34 are normally closed by plugs 35. With the plugs 35 re- 1 moved from the openings 33 and 34, the interior of the smoke passage may be cleaned by a conventional suction furnace cleaner.

If desired, a pair of ducts 36 may be provided which extend from the wall 2i to the upper portion of the'baiile l3 and form passages 31 communicating with the heating chamber l6 and the tubular element ll. This arrangement permits a thorough mixing of air so that air of uniform temperature is delivered to all outlets.

My invention has been thoroughly tested and found to be entirely adequate for the accomplish:

ment of the above objects; and, while I have shown a preferred embodiment of the invention, it will be'understood that the same is capable of modification without departure from the scope and spirit of the invention as defined in the claims.

What I claim is:

1..In a device of the class described, a jacket including front. and rear walls, side walls, and top wall, said jacket defining the outer walls of a heating chamber having air inlet and outlet means, a pair oi laterally-spaced upstanding flanges. extending between said front and back walls, said flanges being spaced from the side walls of the jacket and defining a fire box .in the lower portion of said jacket, an inverted U- shaped baffle extending between the front, and back walls of said jacket, said U-shaped baflie at its upper end being spaced, from the top wall of saidheating chamber and having its lower. ends projecting downwardly below the upper edges of,

said ,fire box forming fianges, one each of said lower endsof the bafile being disposed intermee '4 diate one of the outer walls of said jacket and the adjacent of said fire box-forming flanges, means associated with the lower ends of said baffle preventing communication between the fire box and said heating chamber, an inverted cross-sectionally U -shaped tubular member extending between the front and rear walls of said jacket and de? fining a second heating chamber, said tubular member being spaced from said baffle and having its lower ends projecting below the upper edges of the fire box-forming flanges in outwardlyspaced relation to said fianges and terminatin in upwardly-spaced relation to the lower ends of said bafile, the intermediate portion of said tubular member and said flanges defining the top and side wall of'a combustion chamber, air inlet and outlet means for said tubular member, said fire box-forming flanges tubular member and baiile defining side walls of a smoke passage, said tubular member deflecting the gases of combustion downwardly and outwardly below the upper edges of said flanges, and outlet means from said smoke passage.

2. The structure defined in claim 1 in further combination with a grate structure defining the lower limits of said fire box and in which the lower ends of said U-shaped baffie are secured to opposite side walls of said fire box below the level of said grate structure.

3. The structure defined in claim 1 in which said tubular member is cross sectionally crescent shape. I

4. The structure defined in claim 1 in further combination with a transversely-extended tube connecting opposite sides of said smoke passage,

said tube extending through the upper portion of the legs of said tubular member and through said combustion chamber and being provided, in: termediate its ends, with a damper communicating with said combustion chamber.

CLARENCE E. OLSEN.

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

UNITED STATES PATENTS 7 Number Name .Date v 616,844 Howard Dec. 27,1893 1,491,191 Bruder Apr. 22, 1924. 2,408,087 Miles Sept. 24, .1946

2,408,991 Mumma Oct. 8,1946,

Images