US889388A - Return-flue boiler. - Google Patents

Description

- No'. 889,388. l PATENTED JUNE 2, 1908.

W. MORAN.

RETURN FLUE vBOILER. er1-NATION FILED AUG. 1o. 190s. A

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PATENTED JUNE 2, 1908.

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WILLIAM MORAN, OF WEST MINNEAPOLIS, MINNESOTA.

RE TURN-FLUE B OILER.

Specification of Letters Patent.

Patented June 2, 1908.

Application filed August 10, 1906. Serial No. 330,039.

To all whom. it may concern.'

Be it known that I, IVILLIAM MORAN, a citizen of the United States, residing at West Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Returnllue Boilers; and I do herebydeclare the following to be a full, clear, and exact-description of the invention, such as will enable' To the above ends the invention consists.y

of the novel devices and combinations of devices hereinafter described and defined in the claims.

The invention is illustrated in the accompanying drawings, wherein like .characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a vertical section taken centrally from front to rear through a boiler designed. in accordance with my invention. Fig. 2 is a transverse vertical section taken on the line x2 y? of Fig. 1, some parts being broken away; and Fig. 3 is a horizontal section taken on the line ac3 x3 of Fig. 2, some parts being broken away.

The numeral 1 indicates the upright shell of the boiler and the numeral 2 indicates the fire-box, which latter is concentrically arranged within the former, the two being rigidly connected at their lower extremities by a mud ring 3, and both being rigidly secured to a base casting 4 that forms the ash it. p The numeral 5 indicates the grate within the fire-box, which grate may be of the usual or any suitable construction.

The numeral 6 indicates the usual door which opens into the fire-box, the wall of the fire-box being directly joined to said boiler shell surrounding the door opening.

The smoke-box 7 is attached and projects outward from the boiler shell 1 the same, as shown, being applied to the front portion thereof and having a large normally closed door 8. The smoke-stack or outlet flue 9 leads upward from the top of the smoke-box 7. Secured to the back of the boiler and projecting outward therefrom is a flame chamber 10. The upper portion of the fire-box 2 is connected to the upper portion of this iiame chamber 10`by means of a plurality of short flues 11 of large diameter.

Several horizontal rows of large water tubes 12 extend transversely through the intermediate portion of the fire-web 2 a'nd thus afford communication between the rear and forward portions of the annular water leg that surrounds the fire-box, or, in other words, which lis formed between the fire-box and the surrounding boiler shell. These fiues are preferably inclined slightly so as to facilitate the circulation of hot water ina direction from the rear toward the front of the boiler. The intermediate portions of the front and rear walls of the fire-box 2 are iiattened, as best shown in Fig. 3, so as to afford flat sheets for proper connection of the ends of the flues thereof.

Flues 13 extend transversely through the boiler shell 1 andv axially through the corresponding water tubes 12, and afford conimunication between the flame chamber 10 and the smoke-box 7. At one end, to-wit, as shown at their rear ends, the flues 13 are formed with large thimble-like sections 14 that are directly connected to the rear portion of the boiler shell. Rings or washers 15 are interposed between the end iianges of the flues 13 and of the thimble sections 14. The said thimble sections 14 are of at least as large diameter as the tubes 12, so that When the said thimbles are removed, the said flues may be drawn endwise through the rear Wall of the boiler shell 1.

The intermediate portions of the front and rear walls of the boiler shell 1 are flattened as best shown in Fig. 3, so as to afford fiat flue sheets to which the ends of the flues may be properly connected. Both the boiler shell 1 and the fire-box 2 are preferably cylindrical,

except at their intermediate portions where they are fiattened, as above described. Preferably, the outer plate of the so-called flame chamber 10 is made detachable so that when it is removed access may be had to the flues, and the said flues may be removed end- Wise from the boiler if desired.

By reference to Fig. l itwill be noted that theflames or products of combustion pass directly upward from the fuel, through the spaces left between and around the water tubes 12 and from thence to the top of the fire-box. From the top of the fire-box the iames pass through the short fiues 11 into the flame chamber 10 and from thence they pass to the smokefbox 7 through the flues 13-14- It will thus be seen that thewater which is circulated through the flues is subjected to radiated heat both from the interior and the exterior, and at the same time it will be seen that a large amount of heat is radiated directly into the water which is contained in the water leg surrounding the firebox, and into the body of water contained in the boiler shell above the said fire-box. By this arrangement, a boiler of extremely high heat radiating capacity is provided. Otjherwise stated, the boiler is economical in its use of fuel and is highly efficient in its heating capacity whether used to generate steam in a steam heating plant or whether used to heat water in a hot water heating plant. The practicability of the boiler has been demonstrated by the actual use of a boiler designed as above described.

I/Vhat I claim is:

l. The combination with an upright boiler shell and an upright fire-box Within the same, which boiler shell and fire-box are cylindrical at their upper and lower portions but have flattened front and rear walls, of water tubes extended transversely through said fire-box and exposed to the flame within the fire box, flues extended transversely through said boiler shell and through said water tubes, the ends of said tubes and flues being seated in the flattened front and rear plates of the fire-box and boiler shell respectively, a flame chamber connecting the upper portion of said fire-box to one end of said flues, and a smoke-box into which the other end of said fiues open, substantially as described.

2. The combination with an upright boiler shell and an upright fire-box concentrically located within the same but spaced apart to afford a surrounding water leg, of water tubes extended transversely through said fire-box and exposed to the flame within the fire box, flues extended transversely through said boiler shell and axially through the corresponding water tubes, which flues have enlarged rear ends of at least as large diameter as the tubes, a llame chamber attached to and projecting outward from said boiler shell and opening into one end of said flues, a plurality of relatively short flues connecting the upper portion of said fire-box to the upper portion of said flame chamber, and a smoke-box attached to and projecting outward from said boiler shell and into which the other ends of said flues open, substantially as described.

3. The combination with a boiler shell and a fire-box Within said shell, which boiler shell and fire-box are cylindrical at their upper and lower portions but have flattened front and rear walls, of water tubes extending transversely through said fire-box and with their body portions exposed to the flames within the fire-box and with their ends secured to the flattened front and rear plates thereof, flues extended transversely through said boiler shell and axially through said tubes, which flues have enlarged rear ends, the ends of said flues being seated in the flattened front and rear plates of said boiler shell, a flame chamber secured to and projecting from the rear portion of said boiler shell and communicating with the rear ends of said lines, flues connecting the upper portion of said fire-box to the upper portion of said flame chamber, and a smoke-box connected to and projecting forward from said boilerv shell and into which the front ends of said flues open, said smole-box having an outlet smoke-stack or flue, substantially as described.

In testimony whereof I aliix my signature in presence of two witnesses.

WILLIAM MO RAN.

Witnesses:

MALIE Hom., F. D. MERCHANT.

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