US2140181A - Furnace for melting metal - Google Patents

Description

Dec. 13, 1938. m BANGLE 2,140,181

- FURNACE FOR MELTING METAL Filed Feb. 18, 1938 lllli'i" Gum/M114 Patented Dec. 13, 1938 UNITED STATES PATENT OFFICE FURNACE FOR MELTING METAL Application February 18, 1938, Serial No. 191,307

1 Claim.

The object of my invention is to provide an improved furnace for foundry work such as for melting iron, brass, copper, or any other metals which it may be desirable to melt; and to provide a furnace which will give clean iron free of cinders and flaws; and to provide a furnace of this type which can be operated at low cost and which will produce intense heat.

I attain the objects of my invention by the mechanism illustrated. in the accompanying drawing, in which- Figure 1 is a perspective view of the invention, a portion being broken away and shown in section;

Fig. 2 is a detail view mainly in section of a portion of the furnace wall and the fuel and air conduits leading into same; and

Fig. 3 is a detail plan view of the circular fuel tube 4 and its radiating fuel tubes 5.

Like numerals designate like parts in each of the several views.

Referring to the accompanying drawing, I provide a suitable source of fuel supply such as a tank I from which a fuel pipe 2 extends, having a shut-off valve 3. The fuel pipe 2 communicates with a circular fuel conduit 4 in the fire-resisting bricked in wall I5 of furnace l6. Furnace I6 is open at the top.

Radiating from fuel conduit 4 are a multiplicity of fuel nozzles 5 which are successively pointed upwardly, straight or linearly, and downwardly; those being pointed upwardly and downwardly are preferably disposed at a suitable angle such as 45 or 32 or 22 relative to the pipe 2. Fuel conduit 4 from which the nozzles radiate is circular and extends substantially the entire distance around the wall of the furnace, as shown in Fig. 3.

I provide a suitable motor 6 having a suitable drive shaft 7 which drives the fan or blower 8 by which air is forced through conduit 9 to the circular air conduit II which is of larger diameter than concentric with and encloses a similar circular fuel conduit 4.

Opening out of circular air conduit II are a multiplicity of air nozzles 12 radiating successively in upwardly, straight or linearly, and downwardly directions, as shown in Fig. 1, said nozzles l2 being of larger diameter than the fuel nozzles 5 and concentric with and annularly spaced from said correspondingly radiating fuel nozzles 5. Externally to the air nozzles 12, I preferably provide outer cylindrical linings l3 for each of these air nozzles, as shown in Fig. 2.

The fuel nozzles 5 are mounted in a brick or clay lining [5 of the furnace 16, as shown in Fig. 1. The conduits 4 and II are disposed about eighteen inches from the bottom of the furnace and are mounted tightly against the outside wall of the furnace, as shown.

It will be noted that by providing a multiplicity of radiating air nozzles 12 and fuel nozzles 5 opening out of the respective circular fuel conduit 4 and air conduit II that I secure nozzles operating in the manner of Bunsen burners and which will produce an intense heat in the furnace. The air nozzles [2 are covered with cylindrical layers of asbestos 13 to keep them from melting.

The amount of fuel flowing from tank I can be regulated by the valve 3 and any suitable fuel may be used such as city gas, kerosene, crude oil, or carbide, with suitable adjustment of the apparatus such as capping the fuel outlet tube 5 and making a small hole for gas or carbide. The fuel discharge tube can be set at the various angles shown to give an intense heat for melting metal.

To make a fire in the apparatus, a little gas is forced into the bottom and the fire started gently, or I may use a pan of waste soaked in fuel and attached to a rod.

The furnace produces clean iron, free of cinders and flaws.

What I claim is:

In a furnace for melting metal, the combination of a furnace having a suitable fire-resisting lining such as brick or clay; a fuel tank; a valvecontrolled pipe leading from said tank; a circular fuel conduit mounted in the fire resisting lining of the furnace and with which said fuel pipe communicates; a multiplicity of fuel nozzles radiating upwardly, linearly, and downwardly, in succession from said circular pipe; an air pipe also leading into the furnace and of greater diameter than and encircling a short portion of the fuel pipe; a circular air conduit of greater diameter than and encircling the aforesaid circular fuel conduit; and a multiplicity of air nozzles enclosing and of greater diameter than the corresponding fuel nozzles and correspondingly radiating upwardly, linearly, and downwardly in succession from the aforesaid circular air condut; and a blower connected with and adapted to force air through said air conduit and air nozzles, whereby to produce a hot fiame, and to obtain metal free from cinders or flaws.

JOHN W. BANGLE.

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