US1915132A - Heating furnace - Google Patents

Description

June 20, 1933. cna. .w\.:-LANGFoRD Elf AL 1,915,132

H EATINQFURNAGE INVENTORS fraz/r6 ATTO RNEYS June 20, 1933. G. w. LANGFORD Er A1.

HEATING FURNACE Filed March 50, 1951 2 Sheets-Sheet 2 ATTORNEYS Patented June 20, 1933 UNITED ls'ia'rlas PATENT 'OFFICE GEORGE W. LANGFORl) AND .ALFOBD C. IBLRROTFS, F ABBOB, MICHIGAN, .AS- SIGNOBS T0 EUONOIY BALB COMPANY, 0F .ANN ABBOB, HICEIGAN, .A CORPORA- TION 0F MICHIGAN Application llled Iarch 80,

The invention relates to hot air furnaces and consists -in the novel constructlon as hereinafter set forth.

In the drawings:

Figure 1 is a sectional elevation of the furnace withV the outer' jacket cut away;

another heating unit without 'detachment of the hotrair llues from the jacket.

Figure 5 is a section on line 5-5 of F 1gure, 2.

Figure 6 is a section through a, portion of the furnace showing the deflector used 1n connection with a large jacket.

Among the objects of our invention are, first, to obtain a construction particularly adapted for use withk liquid fuel burners which will effectively prevent any miXlng of the fuel vapor or products 1 of combustion with the air which is being heated. At the same time it is desirable to have a construction which may be readily handled during installation and which is capable of disassembly when necessary for repairs. These results we have obtained by a construction having outer and inner units detachably secured to each other but in such a manner as to preclude any gas leakage through the joints.

Another object is to obtain a very high efficiency both by reason of the amount of heating surface that is exposed to the gaseous products of combustion and to the air to be warmed and also by the disposition of this surface to be most effective in the transfer of heat from the one medium to the other. This result is obtained by the specific construction which is as follows:

A is the inner unit which has a cylindrical portion A forming the combustion chamber and extending downward to the supporting base or that which in a solid fuel furnace would constitute the ash pit section. This cylindrical portion is also provided with outwardly extending door'opening casings B FUBN'AGE 1931. Serial No. 526,486.

and C which extend to a front plate D. A door E connecting with the case C provides access to the interior of said unit A. Above the cylindrical portion A is an upwardly extending conical portion A2 which terminates in an annular flange F for attachment to the outer section. This outer section G has at its upper end a central portion G resting upon the conical portion A2 and provide with a flange F for clamping the same to the flange F.' Extending radially fromthis central portion G are ilues G2 which are substantiallyrectangular in horizontal section, but which taper outwardly as they extend downward so as to clear the conical portion A2. The lower ends of the lues G2 are connected to a segmental annular flue H which surrounds the portion A vof the section A and at the center and to the rear has a nipple H for connecting with the chimney flue.

There is also a nipple G3 connecting to the upper end of one of the lues G2 forforming al direct draft connection with the chimney Each of the sections A and G is formed with welded joints so as to be gas tight, the only detachable joint being between the flanges F and F which can be sealed by a gasket. Consequently there is no opportunity for the gaseous fuel or products of combustion to escape from the furnace into the air chamber. To increase the elliciency, lins I extend radially outward from the inner section A and serve also to divide the rising air currents from each other so as to avoid any obstructing eddies. 'A water tank J is preferably placed in an aperture in the front D above the door 'E where it will be in contact with the warmer air. filled by tilting it outward while resting on the lower edge of the aperture and after fillingthe weight of the water will hold it in pos1tion.

This tank may be j' out sucientlyior removal of the old furnace. The new furnace may then be inserted therein and the jacket closed therearound and attached to the front D.

With the construction as described in operation the cold' air entering at the bottom of the jacket will rise vertically 'through the spaces between the `fins I coming in contact with the outer surface'of the inner section A and passing between the same and the segmental flue H. This segmental flue constricts the s ace within the jacket so that a portion of the ascending air passes between the same and the inner section as 'ust described and another portion passes tween the outer surface of the segmental flue and jacket.Y As soon, however as the air rises above the segmentalflue the volume of unobstructed space within the jacket is increased and the of the more highly heated air adjacent to the inner section will draw the cold air from adjacent to the outer wall of the jacket radially inward between the radially extending iiues G. This'will insure a more thorou h and uniform heating of the rising air be ore it is delivered to the hot air iiues. Furthermore, the radially extending iiues provide a large amount of heating surface,'al1 of which is-wiped by the ascending current of air Yto-obtain a high eiciency in heat transfer.

The construction of the section G with its center or hub portion G and radially extending fiues G is an important feature of the improvement. This permits of forming the outer and inner sections of separateunits which may be assembled witheach other and when attached will form a rigid structure. At the same time provision is made for expension and contraction under varyingtemperatures without any tendency to cause a snapping or other Vdisturbing noise. The joint between the flanges F and F Vcan be readily made gas tight and as all other joints are welded, there is no danger of escape of gas.

As has been stated, the upper end of one of the ilues G2 has a nipple G which is connected through a horizontal flue -Gt with the chimney pipe Hz leading from the nipple H. In the flue Gis a damper K which is automatically operated by a thermostatic connection L. The arrangement is such that when the furnace is cold as in starting, the damper K will be opened so' as to afford .a direct draft without requiring the products of combustion to pass downward through-the flues G2 and segmental flue H. As soon, however, as the furnace is heated -the thermostatic connection L-'will operate to close the damper K compelling the products to pass by way of the flues G and H to the furnace pipe H2.

The doors E and E which normally close the door openings B and C rest against in-A clined sheets and are hinged at the tOp S0 3S vity. If, however,

prpved construction, the old jacket may be v utilized as has been previously described.

Inasmuch, however, as jackets of different furnaces vary considerably in diameter, we have provided means for adjusting our unit to connect 'with the same. Thus as shown, the front plate D is provided at its side edges with outwardly extending lianges D and to these flanges angle bars M are secured by bolts M g through slots M. This permits o adjusting the .angle bars M radially outward or inward so as to lit-the particular diameter of jacket. .At the top there is anbutwardly extending flange D to which is secured'a Vsegmental angle bar N Afor completing the attachment to the'upper end of the jacket. Where jackets are of different fines-G2 only, we have arranged a bamev H3 within the segmentalilue H and at the 'frear side thereof. This will compel the gases passing downward through the rear ilues Gz to travel forward above the bafHe H' and then join the gases descending through the forward iiues Gz to pass under the baille to the nipple H. Y

The furnace may'be readily cleaned by the introduction of a brush throu nipple H when the chimney plpe H* is removed. To avoid the obstruction of the bafile H an aperture is cut therein adjacent to the nipple H which is closed by 'a removable plate H. Thus in cleaning the rear ue Gz the plate H is 'first removed which permits of introduction of the brush through the aperture to find access to said fines.

Where the furnace is used as a replacement This may be accomplished as shown in Figure 6 in which a segmental inclined deector R is secured at its lower end to the jacket 'and directs the ascending air current inward into proximity to the heating surface.

What we claim as our invention is:

1. A hot air heating furnace comprising a central cylindrical section forming the combustion chamber provided with a conical upward extension, asection mounted on said central section having a center or hub portion attached to the upper end of said conical extension, and flues. radiating from said hub portion and extending downwardly therefrom, said iues tapering outwardly in a the rear downward direction, and a segmental Hue connected at the lower ends of the radial Hues and provided with a chimney connection.

2. A hot air heating furnace formed of a plurality of sections, one of said sections havlng a cylindrical portion forming the combustion chamber with an upwardly extending conical portion, another of said sections having a central or hub portion attached to the upper end of said conical section, a series o f Hues extending radially anddownwardly from said hub portion, and a segmental Hue connected to the lower ends of said downwardly extending Hues and surrounding the cylindrical portion of the first section, said segmental Hue being provided with a nipple forming a chimney Hue connection.

3. A hot air furnace comprising a plurality of sections, the i-nner section being formed with a cylindrical portion for enclosing the combustion chamber and a conical upward extension thereof terminating in a Hange, another section comprising a centr-al or hub portion Hanged to be secured to the Hange of said conical portion, a series of radially outward and downwardly extending Hues connected to said hub section, said Hues tapering outwardly to provide clearance between the same and said conical section, and a segmental Hue connecting to the lower ends of said radial Hues, said inner section being provided with vertically and radially extendmg fins for the purpose described.

4. A hot air furnace comprising a plurality of scctionsthe inner section being formed with a cylindrical portion for enclosing the combustion chamber and -a conical upward extension thereof, another section comprising a central or hub portion having attachment to the upper end of said conical portion and also having a series of radially outward and downwardly extending Hues, and a segmental Hue connected to the lower ends of said downwardly extending Hues forming an obstruction between the inner section and the outer jacket whereby a portion of the ascending air will pass between said segmental Hue and inner section and another portion will pass outside said Hue and then radially inward in the pockets between 'said radially extending Hues and in wiping contact with the surfaces thereof. Y

5. A hot air furnace comprising a plurality of sections. the inner section being formed with a cylindrical portion for enclosing a combustion chamber and conical upward extension, an outer section comprising a central or hub portion connected to the upper end of said conical portion and a series of radially outward and downwardly ext-ending Hues connected to said hub section, a segmental Hue connected to the lower ends of said downwardly extending Hues and extending around the furnace from opposite sides of the front, a chimney pipe connected centrally to said segmental Hue and a horizontally extending baHie or partition in said se mental Hue for compelling the gaseous pro ucts descending through the rear downwardly extending Hues to pass forward, said baille being apertured adjacent to the chimney pipe connection to permit of cleaning the ues and a detachable plate for Icovering said aperture.

6. In a hot air heating furnace, a heating unit adapted for replacement use, said unit being provided with a front connected thereto and with a door opening casing extendin from said front inward to the unit an flanges connected to said` front and an le bars radially adjustably secured thereto or attaching the same to jackets of different diameters.

7. In a. hot air heating furnace, a heating unit adapted for replacement use, said unit being provided with a front connected thereto and with door opening casings extending from said front inward to the unit, outwardly extending Hanges on opposite sides of said front and angle bars secured to said Hanges and radially adjustable thereon to be engageable with jackets of different diameters.

8.- In a hot air heating furnace, a heating unit adapted for relpacement use, said unit being provided with a front connected thereto and with door opening frames extending from said front inward to the unit and an outwardly extending Hange at the top of said front and an exchangeable segmental Hange for connecting the top Hange of said front with the jacket and of a curvature corresponding thereto.

9. A hot air furnace comprising a plurality of sections, the inner section being formed with a cylindrical portion and a conical upward extension thereof, an outer section having a hub portion for connecting with said conical extension and a series of radially outwardly and downwardly extending Hues, a segmental Hue connected to the lower end of said downwardly extending Hues and providing a chimney Hue connection, and a series of radial Hns connecting to said inner section and extending outward in the space between the same and said segmental Hue, said Hns dividing the space surrounding the inner section into separatevertically extending air channels for the purpose described. Y

10. A hot air furnace comprising a plurality of sections, the inner section being formed of a cylindrical portion for enclosing a combustion chamber and a. conical upward extension thereof, the outer section comprising a central or hub portion for engaging said conical extension, a series of radially outward and downwardly extending Hues and a segmental Hue connecting the lower ends of said downwardly extending Hues and providing a chimney Hue connection, a

b -pass ue between the upper end ef one o; -said radially extending ues and the chimney flue and a thermostatically controlled damper in said by-pass flue' adapted 5, to o n the same when the furnace is cold and -to c ose when heated.

In testimony wherepf we ax our signa,-

tures.

GEORGE W. LANGrIBORD.V

-10 ALFORD C. BARROWS.

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