US2162411A - Forced air heating furnace - Google Patents

Description

June 13, 1939. 5 STEPHENS 2,162,411

' FORCED AIR HEATING FURNACE Filed Feb. 17,1938 3 Sheets-Sheet 1 ATTORNEY.

June 13, 1939. B. F. STEPHENS 2,162,411

FORCED AIR HEATING FURNACE Filed Feb; 17, 1958 s Sheets-Sheet 2 INVENTOR.

ATTORNEY.

June 13, 1939.

B. F. STEPHENS FORCED AIR HEATING FURNACE Filed Feb. 17, 1958 s Sheets -Sheet s INVENTOR.

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ATTORNEY;

Patented June 13, 1939 UNITED STATES PATENT OFFIGE- FORCED AIR- HEATING FURNACE Benjamin F. Stephens, Tulsa, Okla.

Application February 1'1, 1938, Serial No. 190,892

4 Claims.

10 circulated through the furnace and through the rooms of the residence to be heated by a blower which is usually located in proximity to the furnace and draws the cool air through suitable conduits from the rooms and discharges the same 15 into and through the furnace, from whence after being heated itis returned to the rooms to heat the same.

n One of the primary purposes of my present invention is to provide a furnace of the character indicated which will be highly eflicient in use so that the maximum number of heat units generated in the furnace will be picked up by the heating air as it travels through the furnace and thereby utilized for heating purposes.

85 With this purpose in view, my invention contemplates the direction of the heating air through the furnace in such a manner that it will be exposed to the heating influence of the products of combustion for a substantial distance and length of time during its travel through the. furnace. Additionally, the products of combustion are bailled and caused to travel in a tortuous path so that maximum heat units may he abstracted therefrom before such products leave the furnace 35 and enter the stack. e

Other objects and many of the inhere'nt advantages of my invention should be readily appreciated as the same becomes better understood by reference to the, following description when considered in connection withthe accompanying drawings.

Referring to the drawings, Fig. 1 is a perspective view. of the exterior of a furnace constructed in accordance with my invention; 45 Fig. 2 is a longitudinal sectional view from front to rear of the furnace shown in Fig. 1 taken on v .the line 2-2of Fig.

Fig. 3 is a transverse sectional view on the line 3-3 of Fig. 2; a 1 50 Fig. 4 is a plan view on a reduced scale of the furnace structure with the outer casing removed;

and 1 Fig. Sis a perspective view of the furnace with the outer casing removed,- some of the parts being broken away to expose portions otherwise concealed.

Referring to the drawings more in detail, reference character 6 indicates generally the outer jacket or casing of the furnace which for heat insulation purposes is preferably of double wall construction as' illustrated. The space between the walls is usually filled with suitable insulating material. The dome of the Jacket is provided with one or more openings (not shown) for con- 10 nection to hot air conduits leading to the rooms to be heated through which the heated air is delivered from the furnace. The furnace front is provided with a door 1 opening into the cornbustion chamber 8 in which are located a plurality of burners'9, here illustrated as being of a type adapted to burn natural gas which is supplied to the burners from a pipe i i. Pilot burners l2 positioned in proximity to the main burners receive their gas supply from a pipe l3. Below the door I, the furnace is provided with an air inlet opening equipped with louvers H for draft regulation purposes, the air entering through these louvers being conductedby a conduit L5 to the mixing box It where it is mixed with the gas delivered by the pipe ii to produce a combustible mixture of the required proportions for the burners.

An open ended heating chamber i'l, shaped as shown in Fig. 3, extends longitudinally through 0 the combustion chamber 8 and is protected against the intense heat from the burners by a protecting baflie l8. The products of combustion from the burners rising at each side of the chamber |I are deflected toward the rear of the charnher by a pair of baflle plates l9; illustrated in Figs. 2 and 3, from whence the products of combustion pass from the combustion chamber through an outlet opening 2| at the forward end of the chamber into a transverse passage 22 from 40 the ends of which such products 'enter the side compartments 23, through which the lateral heating chambers 24 extend from end to end. To insure prolonged heating contact of the products of combustion with the exterior walls of these lateral heating chambers, the compartments 23 a are equipped with bailies 25 which cause the products to flow in a tortuous path through these compartments into a transverse connecting chamher or conduit 26 at the rear of the furnace and from which the products are discharged through a pipe 21 to the stack or chimney. f

It will be apparent, therefore, that the products of combustion travel in quite a tortuous 'path through the furnace, first around the bailles I! in the combustion chamber, then transversely through the passage 22, then around the bailies in the compartments 23, thence into the transverse passage 26 at the other end of the furnace, and flnally out through the pipe 21. During its passage through the furnace in this tortuous path, the products of combustion are brought in prolonged contact with the walls of the heating chamber l1, and likewise, in prolonged contact with the walls of the lateral chambers 24 so that a large proportion of the heat units of the products are delivered through these walls to the interiors of these chambers, and in addition, some heat is further given off through the walls of the combustion chamber, the walls of the side compartments, and the walls of the transverse passages 22 and 26.

The air to be heated and delivered to the rooms is conducted to the furnace by a conduit 28 (Fig. 2) from a blower 30 of any preferred construction which is conventionally shown. The

air enters the furnace through the rear wall of the jacket near the bottom thereof, and some of Jacket.

it passes into the vertical conduit 23, from which it is directed by deflectors 3| into the heating chamber H where it is heated by the surrounding products of combustion in the combustion chamber and is then directed by deflectors 32 at the opposite end of the chamber into an upwardly opening conduit 33, from which it is discharged upwardlynear the front wall of the A large proportion of the remaining air delivered by conduit 28 enters the two vertical conduits 34 disposed on opposite sides of the combustion chamber, and from. the upper ends of these conduits such air is directed'by the deflectors 35 into the forward ends of the heating chambers 24, through which such air flows under pressure and is discharged from the rear ends of such chambers. This heated air rises to the top of the jacket from whence it is conducted by the heating conduits to the rooms to be heated.

It will be apparent, therefore, that some of the air is passed through the furnace from rear to front thereof through the heating chamber located in the combustion chamber, that other air is passed along, the sides of the lower portion of the combustion chamber, is then conducted upwardly and directed into the lateral heating chambers where it likewise is heated by the profiucts of combustion surrounding these chambers, and that the remaining air which falls to enter either conduit 29 or conduits 34 flows upwardly around the combustion chamber and around the lateral compartments 23 so as to be heated thereby, whereupon this air together with that delivered from the chambers 24 and ;the chamber l1 become intermingled at the top of the furnace for delivery through the hot air conduits for heating purposes.

For the purpose of maintaining the heated air at the proper humidity, an open top receptacle is mounted on the top wall'of the combustion chamber and is supplied with water through a pipe 38 from a receptacle 39 mounted on the front of the furnace into which the water may be poured from a pail, or suitable automatic mechanism for maintaining a predetermined water level in the receptacle 31 may be employed if preferred. w

The construction, method of operation, and advantages of the furnace embodying the principles of my invention should be apparent from the foregoing without further description, and it should be manifest that the structural details illustrated and described are capable of modification within considerable limits without departing from the essence of the invention as defined in the following claims.

I claim:

, .1. A furnace comprising a combustion chamber, a heating chamber extending longitudinally therethrough, a blower, a conduit. for delivering forced air from said blower into the rear end of said heating chamber, upwardly turned deflectors interposed in the path of the air issuing from the other end of said chamber, a pair of lateral heating chambers, conduits for delivering forced air from said blower into the front end of each of said lateral chambers, means for deflecting upwardly the heated air issuing from said lateral chambers, and means for conducting products of combustion from said combustion chamber around said lateral heating chambers to heat the air flowing therethrough.

2. A furnace comprising a combustion chamber, a heating chamber extending longitudinally therethrough, a conduit for delivering forced air into the front end of said heating chamber, a blower for forcing said air through the conduit, deflectors for diverting air upwardly from the other end of said chamber, a pair of laterally disposed heating chambers extending longitudinally of the furnace, means for conducting products of combustion around said heating chambers to heat the same, conduits for delivering forced air into the rear ends of said lateral chambers, and a furnace jacket into which the heated air from all of said heating chambers is delivered.

3. In a furnace,'the combination of a combustion chamber, a heating chamber extending therethrough, an outlet conduit at one end of said combustion chamber, a transverse conduit communicating with said outlet conduit, heating compartments communicating with said transverse conduit, a transverse conduit connected with the opposite ends of said heating compartments, a delivery conduit communicating with said last mentioned transverse conduit, heating chambers arranged in said heating compartments, conduits for delivering air into each of said heating chambers, deflectors in said conduits for distributing the air delivered to the chambers, a blower for discharging air into said conduits, and a jacket enclosing said furnace.

4. A furnace comprising a combustion chamber, a heating compartment located at each side of said combustion chamber, an open ended heating chamber extending through said combustion chamber, an open ended heating chamber extending through each of said heating compartments, an outlet for products of combustion from the furnace, conduits for conducting products of combustion from said combustion chamber through said heating compartments surrounding the heating chambers therein, baflles in said lateral heating compartments arranged to direct the flow of combustion products through the compartments around said chambers, a blower, a conduit for delivering air into the rear end of the heating chamber located in the combustion chamber, conduits arranged to deliver air into the front ends of the heating chambers located in said heating compartments, and deflectors for deflecting the air issuing from said heating compartments upwardly within said casing.

BENJAMIN F. STEPHENS.

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