US1351803A - Hot-blast downdraft-furnace - Google Patents

Description

l. J. SMITH.

HOT BLAST DOWNDRAFT FURNACE.

Patentedsept. 7,1920.

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siren STATES JONATHAN J. SMITH, F DES MONES, IOWA, ASSIGNOR OF ONE-HALF T0 OSCAR F.

PATENT OFFICE.

PETERSEN, 0F' DES MOINES, IOWA.

Application filed March 5, 1919.

To ZZ y11i/tom vf?? muy concern.'

Be it known that l, JoNA'rHAN J. SMrri-I, citizen of the United StatesY of 'Americza and resident of Des Moines, Folklcounty, Iowa, have invented a new and useful Improvement in Hot-Blastv Downdraft-Furnaces, of which the following is a specilication.

rille object of this invention is to provide improved means for increasing the efficiency of furnaces burning bituminous coal or other fuel high in volatile'earbon.

My invention has for its further object the ventilation of a'room or compartment adjacent to a furnace, whereby the foul air may be withdrawn from said room and passed through the combustion chamber of said furnace. Y

My invention consists in the construction, arrangement and combination of elements hereinafter set forth, pointed out in my claims and illustrated by the accompanying drawing, in which- Figure 1 is an elevation, partly in section, illustrating the application of my im provenient to a furnace and adjacent room.

A Fig. 2 is a horizontal section on the indicated line 2-2 of Fig. 1. Fig. 3 is a vertical section on the indicated line 3 3 of Fig. 1.

The improvement hereinafter described may be employed, singly or in multiple, in connection with any selected form of furnace, particularly such as may be used in heating a building by hot-air circulation, steam ,or hot water radiation, and in this connection the furnace shown is typical of one form only. Y

In the construction of the devices as shown the numeral designates generally a furnace or heater of the hot-air type and it may be of any desired and suitable construction, preferably modilied in the particulars herein pointed out. TheV furnace 10 preferably is lined throughout its entire interior height by an overlay 11 of heat-resisting plastic material such as fire-clay and a smoke-discharge 12 is provided in said lining and communicates with a drum 13 having a smoke-discharge 14 near the lower end thereof adapted to communicate with a flue or chimney, not shown, for draft purposes. Any suitable casing or jacket may be used, a portion 15 thereof being shown.

The furnace 10 preferably is provided with a dome 16 formedwith a central opening Specication of Letters Patent.

Patented Sept. 7, 1920.

Serial No. 280,893,

and a pipe 17 is mounted vertically in said uenmg and projects above and below said dome. A flanged collar 1S is fixed to the upper `surface of the dome 16 and surrounds said pipe 17 and the pipe is secured to said collar by a set screw 19. A conductor or conduit pipe 2O communicates at-one end with the upper end of the pipe 17 andl at its other end is located within the wall 21 of a room 22, such as a kitchen, and is controlled by a damper or valve 28 mounted on said wall. The admission of air to, and consequent passage of air through, the pipe 2O is controlled entirely by manual adjustment of the damper or valve 23. A nozzle device is'mounted on the inner end of the pipe 17, within the furnace and adjacent to the dome 16, and said nozzle device preferably is made of metal by molding and is in one piece and imperforate except as hereinafter provided. rl`he nozzle device is constructed with a collar member 2st adapted to be screwed on the pipe 17 and a discharge collar member opposite thereto, said members being joined by tubular arched members 26, in this instance eight in number, spaced circumfcrentially thereof and joining and communicating at their ends with said collar members. There is no communication between the tubular arched members and the space between them, but said space or spaces accommodate and permit the passage of heated air and burning` gases and flames c round and between said members to the end of heating the air within and while passing through said collar and arched communicating members.

ln practical use the coal or similar fuel is placed on a grate 27, kindling` is laid on said coal and paper or shavings is laid on said kindling; the damper 23 is opened; and the paper or shavings is ignited in any suitable manner. Then all the doors and other draft devices such as are commonly found in said doors are closed and air is drawn through the pipes 20 and 17 and the nozzle device to supply oxygen for combustion within the chamber. As the combustion proceeds the coal is ignited and releases volatile carbon, and at the same time heat envelops and raises the temperature of the nozzle device above (SOOO F. Thereafter the air entering the combustion chamber of the furnace, through the nozzle device, and said nozzle device supplies substantially all of the air employed therein, is heated to a tem-` perature above 600O F. to the end of comvmingling said air with theV volatile carbon released from the coal and creating a gas that will be consumed in the chamber and conserve the carbon, which 'otherwise might pass off, unburned, through the smoke fines.

The fuel supply may be replenished in any desired manner, such as by the introduction of coal through the open fuel door, and.

and noxious odors from any place, such as a kitchen 22.

A Any desired modification of the arrangement and location of parts may be made and I do not desire to be understood as limiting myself in such particular.

I claim as my invention- 1. A pipe adapted to be suspended within a furnace and a nozzle device suspended on said pipe, said nozzle device having opposed spaced collars, one opening to said pipe and the other opening to said furnace, and intermediate, wholly outwardly arched communieating tubular members opening at their ends only to said collar members.

2. A pipe adapted to be suspended within a furnace, and a nozzle device suspended on said pipe, said nozzle device havingy and including spaced annular collars, one opening to said pipe and the other opening only to said furnace, and intermediate, wholly outwardly arched, spaced,'tubular members between and communicating at their ends only with said collar members. i

3. A nozzle adapted for use ina hot-blast down-draft furnace, said nozzle comprising spaced annular collars having a common axis, the spacing being on the line of said axis, and wholly outwardly-arched circumferentially-spaced tubular members between, connecting and communicating at their ends only with said collars.

Signed at Des Moines, in thevcounty of Polk and State of Iowa, this 22d day of February, 1919.

` JONATHAN J SMTH.

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