US341048A - Fire-arch for boilers - Google Patents

Description

(No Model.)

R. PATRICK.

FIRE ARGE PoR BoILBRs.

No. 341,048; Patented May 4, 1886.

In @mk www Nrrnn STATES PATENT OFFICE.

ROBERT PATRICK, OF BRAINERD, MINNESOTA.

FIRE-ARCH FOR BOILERS.

SEECIFICATION forming part of Letters Patent No. 341,048, datedA May 4, 1886.

(No model.)

To all whom t may concern.:

Be it known that I, ROBERT PATRICK, a citizen of the United States, and a resident of Brainerd, in the county of Crow W'ing and State of Minnesota, have invented certain Improvements in Fire-Arches for Locomotive Boilers, of which the following is a specifica-` tion.

My invention relates to improvements in deflecting-plates or fire-arches for locomotive fire-boxes; and the invention consists, generally, in a hollow metallic bridge or watertable, in form and position similar to the ordinary nre-brick arch, and constructed so as to be readily applied to or removed from the fire-box.

The invention also consists in the construction and combination hereinafter described, and particularly pointed out in the claims.

In lire-boxes of this class it is found advantageous to place an arch under the tubes, extending diagonally toward the crown-sheet, for the purpose of partially reverberating the products of combustion and preventing thein fiammable gases from passing directly through the tubes. The common mode of accomplishing this result has been to form an arch of this description of fire-brick, in two or more sections, and supported upon the sides of the furnace. The intense heat of the gases im pinging upon the crown of this arch soon causes it to give way and become displaced. I obviate this by making the arch of hollow cast-metal sections, having a circulation of water through them, so that the arch is capable of withstanding any amount of heat.

In the accompanying drawings, which form part of this specification, Figure l is a vertical section of a tire-box having my improvement applied thereto. Fig. 2 is an end elevation and partial section of the same. Fig. 3 is a plan showing the water connection. Fig. 4 is a section'of my improved arch, showing the interior construction.

2 in the drawings represents the fire-box, surrounded by the water-leg 4, inclosed at the bottom by the grate 6, and provided at the back with the fire-door 8.

10 represents a tire-arch made of cast-iron, and composed of several hollow sections. I

nd it most convenient to form the arch of three sections, as shown, the center section acting as a key to hold the whole in place. Each section is preferably cast in one piece, as shown, and the sections are preferably of the form substantiallyl as shown. The sections may be secured together in any suitable manner. I prefer to form recesses 12 in the edges of the sections, into which rods 13 are inserted after the sections are put in place.

14 14 are bolts or studs, which support the four corners of the arch, and are tapped into the side sheets of the furnace. To avoid covering a large surface of the tubesheet, I form the two' outer sections with projections 17, which rest against the tube-sheet.

19 represents a pipe,which is passed through a tube or thimble in the water-leg 4., and is tapped or otherwise secured in the center section of the iire-arch, and by means of a T- coupling, 20, and the branch pipes 21 it is also connected to the two side sections. The outer end of the pipe is also connected with the tank, either directly or through a pump or injector.

22 represents a pipe connected to the opposite end or highest part of the arch 10. This pipe is connected with each section of the arch, and passes out through the water-leg of the tire-box, and is carried back to the tank or is carried directly to the boiler, as desired. A glass water-gage, 25, may be located upon this discharge-pipe to indicate the position of the water in the arch.

It will be seen that when the arch is in place in the iire-box, as described, and the connections are made by the pipes 19 and 22, a cir culation of water may be kept up through the arch 10, which is thus prevented from burning out, andat the same time the arch may be utilized as a feed-water heater.

As each section of the arch is cast preferably in one piece, there is no danger of leakage, and whenever it is necessary the arch may be readily removed 'by uncoupling the pipes 19 9 22 and removing the rods 13, when the sections can be readily taken apart.

Each section of the arch is preferably provided With an opening, 31, in its end, through which the core may be withdrawn in casting,

and this opening is provided with a plug, 33, which may be removed when it is desired to Wash out the arch.

I claim as my invention- 1. The combination, with the fire-box, of the fire-arch composed of the cast-metal hollow sections 10, the pipes 19, connected to one end of the arch, and the discharge-pipe 22, connected to the upper end of the arch, substantially as described, and for the purpose set forth.

2. The combination, With the fire box,of the nre-arch composed ofthe independent hollow sections 10, means connecting said sections and means for supporting said sections, and the inlet and discharge pipes connected with each section of said arch, substantially as de scribed.

3. The combination, with the lire-box, of the hollow cast-metal sections 10, having the recesses 12, the rods 13, inserted in said recesses, and the studs 14, supporting the corners of the arch and tapped into the side sheets of the furnace, substantially as-described.

4. The combination, with the center section, of the side sections having the projections 17, resting against the tube-sheet, the pipe 19, connected with the center section, the coupling 2O and branch pipes 21, connect-ed to the side sections, and the dischargepipe 22, connected to the highest part of each section, all substantially as described. v

In testimony whereof I have hereunto set my hand this 4th day of February, 1886.

l ROBERT PATRICK.

In presence of- G. S. FERNALD, L. C. CARLETON.

Images