US752123A - Fire-box for steam-boiler or other furnaces - Google Patents

Description

N0 MODEL.

PATENTED FEB. 16, 1904. J. M. STRATTON.

FIRE BOX FOR STEAM BOILER OR OTHER FURNACES.

APPLIGATION FILED 1350.31, 1902.

2 SHEETS-SHEET 1.

WITNESSES:

g IIVVENTOR A TTORIVEYS 1n! mums PEPE"! co. Puomufxu, wasuwawa. u. c.

No. 752,123 PATENTED FEB. 16, 1904. J. M. STRATTON. FIRE BOX FOR STEAM BOILER OR OTHER FURNACES.

APPLIGATION'IILED DEG. 31, 1902.

N0 MODEL. 2 SHEETS-SHEET 2.

WIN/E8858 111/ vmron umwam ,%1 I BWWW W Patented February 16, 1964.

UNITED STAT S PATENT OFFICE.

JAMES MACDONALD STRATTON, OF BROOKLYN, NEW YORK.

FIRE-BOX FOR STEAM-BOILER OR OTHER FURNACES.

SPECIFICATION forming part of Letters Patent No. 752,123, dated February 16, 1904.

Application filed December 31, 1902. Serial No, 137,262! (No model.)

To all whom it may concern:

Be it known that I, J AMEs MACDONALD STRATTON, a subject of the King of Great Britain, and a resident of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Fire- Boxes for Steam-Boiler or other Furnaces, of which the following is a specification, reference being had to the accompanying drawings,

forming a part thereof, in which similar char' actors of reference indicate corresponding parts.

This invention relates to fire boxes for steam boiler or other furnaces, the object thereof being to provide an apparatus of this character embodying a novel construction and combination of parts so assembled as to induce uniform combustion of the fuel in the furnace and conduct the air or other medium employed to assist combustion in such a manner as to obviate liability of collapse of the furnace shell or cylinder at its crown by reason of too rapid combustion of the fuel at the sides of the furnace, which is frequently the case in furnaces where the draft under the grate is not controlled, and therefore allowed to spread to the sides. To accomplish this result, I employ a longitudinally extended channel or chamber to conduct the air or other medium directly beneath the central part of the grate to cause a direct draft through the central part of the fuel body. I

The invention will be hereinafter fully described, and specifically set forth in the annexed claims.

In the accompanying drawings, forming part of this specification, Figure 1 is a longitudinal sectional elevation of part of a furnace having my improvements embodied therein; Fig. 2 a, cross-sectional elevation taken on the line in a" of Fig. 1; Fig. 3, a longitudinal sectional elevation of a part of a furnace, illustrating a slight structural modification of my invention; and Fig. 4 is a cross-sectional elevation taken on the line y y of Fig. 3.

In the, practice of my invention as illustrated by Figs. 1 and 2 of the drawings I have illustrated the device in connection with a part of a furnace of ordinary construction com- 5 prising the cylindrical fire box A, grate B,

ash-pit O, and air-box D of the ordinary character employed Where an induced current of air or other medium is used. This air-box has an inlet-tube 0, leading through the side thereof, which is adapted for attachment with a blower or other suitable source of supply, and an outlet-portc' leads therefrom into an air-chamberE, located within the ash-pit at the forward end. This chamber E has an outlet-portc, which communicates with a port f, leading through the front wall of the air-con.- ducting channel F, which comprises the easing F, embodying the side walls 1 1 and end walls 2 2 and the trough F. This said airchannel is located within the ash-pit upon a horizontal line beneath the grate, and the side walls extend upwardly beneath the grate-bars, the end walls conforming to the shape of the bridges supporting the grate-bars, whereby the draft is forced directly up through the central part of the grate and brought into direct contact with the central part of the mass of fuel to facilitate combustion at the center and prevent undue combustion at the sides, which generally occurs when the draft is allowed to spread to the sides of the cylinder forming the furnace-walls.

To admit of cleaning the ashes from the trough F and also to control the draft, if desirable, an opening f and damper Or are provided. This opening is formed through the front walls of said trough, and it is normally closed by means of the damper G; but it may be opened or partly opened, if found desirable, to allow a material draft to enter the channel F.

In the construction illustrated by Figs. 3 and 4 of the drawings the air-channel comprises longitudinal plates H H, extended longitudinally through the fire-box and hinged, as at it, whereby they may be swung to either the right or left to expand or contract the outlet of the channel, so that the outlet of the channel may be arranged in proper relative arrangement with the bottom of the grate. The plates H have auxiliary vertically-adjustable plates H connected thereto by means of bolts I and nuts 2 the bolts passing through slots h in the plates H, These last-named plates may he slipped as far as the length of the slots h, and thereby made to regulate the amount of air admitted from the air-channel into the ash-pit. In this construction the induced draft is supplied through the medium of the air-box D, which communicates with an inlet-port 0 in the front of the ash-pit.

In the operation of the invention the draft of air or other medium being supplied and conducted directly beneath the central part of the mass of fuel causes uniform combustion within the fire-box of the furnace and prevents the side spread of the draft and consequent too rapid side combustion of the fuel, which causes the flames to unduly heat the furnace-cylinder at its sides and near the dome, which frequently, owing to rapid expansion and contraction of the plates forming the cylinder, causes collapse.

I do not confine myself to the specific details of mechanical construction, proportion, conformation, and relative arrangement of the parts as herein shown and described, as it is obvious that under the scope of my invention I am entitled to structural variations necessary to applying my invention to various styles of furnaces.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

. 1. In a draft-controlling means, the combination with a fire-box comprising side walls,

a grate, an ash-pit and an air-box; of an airchannel having end walls, side walls and a bottom, located in said fire-box directly under the middle of said grate and opening thereinto, a conduit communicating with said airboX and having an inlet leading into said channel, a damper in said inlet, and adamper door T ing combustion from said air-box to said airchannel and said grate, and dampers arranged to control the flow of such media into said channel and to said grate.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 23d day of December, 1902.

JAMES MACDONALD STRATTON.

Witnesses:

B. PATTERSON, c S. M. STONE.

Images