US391031A - Combined steam and hot-air heater - Google Patents

Combined steam and hot-air heater Download PDF


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US391031A US391031DA US391031A US 391031 A US391031 A US 391031A US 391031D A US391031D A US 391031DA US 391031 A US391031 A US 391031A
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    • F24H6/00Combined water and air heaters


(NoModeL) W; H. 'DENSLOW.
Patented'OGt. 16, 1888.
O OO O O 0 O filqflmwle N. PETERS. PholzrLilhographen Walhmglfln. 04 c.
EPECIPICATION forming part of Letters Patent No. 391,031 dated October 16, 1888.
(No model.)
To all whom, it may concern.-
Be it known that I, WILLIAM HURRURT DENsLow, a citizen of the United States, residing at Ulster, in the county ofBradford and State of Pennsylvania, have invented a new and useful Improvement in Combined Steam and Hot-Air Heaters, of which the following is a specification.
My invention relates to an improvement in combined steam and hot-air heaters; and it consists in the peculiar construction and arrangement of the parts of the same, which will be more fully set forth hereinafter, and particularly pointed out in the claims.
In the accompanying drawings, Figure l is alongitudinal vertical section of my improvement. Fig. 2 is ahorizontal section on the line was of Fig. 1, with a portion of the cap broken away. Fig. 3 is a detail perspective view of my improved boiler cap-plate.
A indicates the boiler of my improvement, having a series of flnes, a. Below the boiler a fire-chamber, B, is arranged, having a suitable plate, under which is any preferred form of ashpitB. Theboiler-fluesaopenintothechamber above the top of the boiler-plate. The sides of the boiler are formed with suitable flanges, a, which project downwardly and rest in the casing of the fire-chamber B. The upper portion of the sides of the said boiler project above the upper head, forming a flange for the reception of a cap-plate, O. This capplate O is formed with a series of varying-sized apertures concentrically arranged around the enlarged opening in the center of said cap. This cap 0 fits snugly within the flange formed at the upper portion of the boiler, and the smoke and products of combustion passing through the tines (1 enter the small chamber formed by the cap-plate O and the boiler A. The concentrically-arranged apertures c in the cap-plate 0 being of varying sizes, the smoke will not pass as readily therethrough as if the said apertures were constructed of an equal size, and enlarged and of an equal diameter with the fines a. By this means it will be seen that the smoke and products of combustion will be concentrated at the top of the boiler, as well as the gases arising from the flues a, and the said smoke and gases caused to reflect on the top portion of the boiler and thereby radiate the heat therefrom outwardly into the hot-air space. In connection with each of the taper tnres 0 formed in the top portion of the capplate 0 are a series of smoke-fines, which are, of necessity, arranged radially,and which connect with the top portion of the central flue, S, which in turn is connected to the smokepipe S. The top portion of the central flue, S, is provided with a damper, T, which is arranged below the series of radially-mounted smoke-fines F, whereby the draft may be regulated, as will be readily understood.
It is obvious that the central flue, S, can be dispensed with and the flues F made to com-', municate directly with the smoke-pipe S, and such an arrangement would involve no departure from the spirit of my invention.
Around the boiler A an annular chamber, B is arranged, having a partition, D, horizontally arranged therein, and dividing the said chamberinto two different compartments. The one side of the partition D is provided with a damper, d, which is operated from the outer portion of the heater entire, as will be readily seen, while in the opposite side of the said partition to that in which the damper d is mounted, an aperture, d, is formed. The said annular chamber B is supported upon a bracket, D which is secured to the lower portion of the boiler A, a space beingleft between the inner portion of the said chamber and the outer wall of the boiler. of one side of the annular chamber B a pipe, D is secured, which runs upwardly and connects with the smoke-pipe S. To the top portion of the said chamber B a pipe, I), is secured, which also extends upwardly and is connected to the smoke-pipe S. Between the connecting-points of the pipes D and D a damper, S, is mounted in the smoke-pipe S, the operation of which will be presently explained. The smoke and gases arising from combustion pass up through the center flue, S, and through the smaller flues a, and eventually unite in the common smoke-pipe S. If it is desired to cause such smoke and gas to pass through the annular chamber B, the damper S is closed, when the entire volume of the smoke and gas will pass downwardly through the pipe D into the top compartment, and the damper d having been previously closed the smoke and gas of the annular chamber B will pass around the said compartment and To the lower portion through the aperture 41 under the partition dividing the said annular chamber, and thence around through the lower compartment outwardly through the pipe D, by which it is again conveyed into the smoke-pipe S ahead of the damper S. By this means it will be seen that the heat contained by the smoke and gases arising from the combustion in the firechamber will be caused to radiate from said smoke and gas by means of the tortuous circulation in passing through the center fine, S, the small fines a in under the cap 0, through said cap into the pipes F, thence into the smoke-pipe S, downwardly through the connecting-pipe D, and into the chamber B", having exit therefrom in the manner hereinbefore described. Through the medium of this tortuous circulation the heat carried by the smoke and gas is utilized at every point and radiated both from the cap-plate O and the annular chamber B? into the hot-air chamber R, formed by the casing E surrounding the boiler and the several connections described, and through which the several pipes pass, as shown. The air contained in said chamber, which may be fed thereto by suitable means, is heated by radiation from the fire-chamber and the annular chamber B and by the capplate 0. By my improved construction it will be seen that every particle of available heat is utilized by radiation toincrease the temperature of the air within the hot-air chamber.
To the upper portion of the casing E, enveloping the boiler and its several connections, and forming the hot air chamber, a pipe, E, is secured, which is used for the conveyance of hot air to suitable places for heating purposes. To the top portion of the boiler A a steam-pipe, a, is secured, which passes upwardly through the hotair pipe E; and adjacent to the casing E, or at some distance away therefrom, a coil, E, is formed, with which the steam-pipe a connects at one side and a pipe of like diameter with the opposite side, while a series of pipes, a connected to heads a", are arranged between and in connection with the two pipes, as set forth. From the forward end of the coil a returnpipe, 0,, is secured, running back to thelower portion of the boiler, to return the waters of condensation thereto, as will be readily understood. As the steam passes into the coil E, a radiation takes place therefrom, and the heat thus radiated is absorbed by the air issuing from the casing or hot-air chamber surrounding the boiler, and in this superheated condition passes to the place where necessary for the utilization thereof. By this means the steam conveyed from the boiler to any part of the building is passed through the hot-air flue, and by means of the construction of the coil, as hereinbefore described, the steam is I not only conveyed from the boiler, but at the same time heats the hot air passing through the practicability. and utility of my improved construction.
The novelty and utility of my improved heater being obviously apparent. and appreciable, it is unnecessary to further enlarge upon the same herein.
Having thus described my claim- 1. In combination with the boiler provided with a series of fines open at both ends, the combustion-chamber below the boiler, and the removable cap fitted over the top of the boiler, so as to cover the upper ends of the fines thereof, said cap being elevated above the top of the boiler, and thus leave a space between the upper side of the boiler and the under side of the cap, in which space the heat from the fines of the boiler collects, the main line S, and the auxiliary fines F, leading from different points of the cap to the main flue, as and for the purpose set forth.
invention, I
2. The combination, with the boiler A, of
the cap 0 on the top thereof for collecting the products ofcombustion and radiating the heat therefrom, and the annular chamber 13*, divided into two compartments by a horizontally-arranged partition, and surrounding the boiler from the cap 0, the flue S, leading from and connecting with the flues F, and the flues D D, leading from the bottom and top, respectively, of the annular chamber B to the fiue S, substantially as described.
3. The combination of the boiler A and its flues, the cap-plate C, with apertures a therein and covering the fines, the annular chamber B, having connection with the smoke-pipe, as set forth, the outer casing surrounding the boiler and outer chamber forming a hot-air chamber, the pipe E, connecting with said chamber, the radiating section E, and the pipes. connecting said section with the boiler A, substantially as described.
4. The combination, with the boiler, the combustion-chamber, the pipe S, and the smoke-pipe S, of the chamber B arranged around the boiler and having the partition with the damper, as described, so as to provide a-tortnous circulation, the pipe S,,having the damper S the pipe D", connecting with the pipe S on. one side of the damper S said pipe D* supplying the chamber B with the products of combustion escaping up the pipe S, and the pipe D connecting with the pipe S on the other side of the damper S", said pipe D connecting with the chamber B to carry off the heat, smoke, and gases therefrom after circulating through the chamber B, as set forth.
In testimony that Iclaim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526464A (en) * 1947-03-14 1950-10-17 George W Folk Hot-air heater and boiler therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526464A (en) * 1947-03-14 1950-10-17 George W Folk Hot-air heater and boiler therefor

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