US1044669A - Hot-air furnace. - Google Patents

Description

C. H. LEE.

7 HOT AIR FURNACE. APPLICATION FILED MAR. 29, 1912.

Patented Nov. 19,1912.

2 SHEETS-SHEET 1 WTNEEEEE. M

G. H. LEE, HOT AIR FURNACE.

APPLICATION FILED MAR. 29, 1912. 1,044,669.

2 SHEETS-SHEET 2.

WTNESEEE- v NVENTU 4% MM a! Mmzw COLUMBIA PLANOGRAPH 60., \VASHIN Patented Nov. 19, 1912.

tlhlllTFl) STATES PATENT OFFICE.

CHARLES H. LEE, OF TOLEDO, OHIO.

HOT-AIR FURNACE.

To all whom it may concern:

.Be it known that I, CHARLES H. LEE, a citizen of the United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented new and useful Improvements in Hot-Air Furnaces, of which the following is a specification.

lily invention relates to a hot air furnace, and has for its object to provide an economical furnace of the kind, of simple and inexpensive construction, and that is adapted to utilize an increased percentage of the heat generated therein. 1 accomplish these objects by the construction, arrangement, and combination of parts as hereinafter described and illustrated in the drawings, in which Figure l is a view in vertical diametric section of a furnace constructed in accordance with my invention, the section being on line XX of Fig. 2. Fig. 2 is a similar View on line XYY of Fig. 1. Fig. 3 is a horizontal section on line ZZ of Fig. 1 looking toward the top. Fig. l is a side elevation of the top section. of the furnace body. Fig. 5 is a top view of the feed door section of the furnace body. Fig. 6 is a section on line ZZ of Fig. 1 looking downward. Fig. 7 is a horizontal section of a flue section of the furnace body showing a water pipe from a water service system introduced in the hot air flues. Fig. 8 is a perspective view of an air line section of the furnace body, detached. Fig. 9 is an enlarged broken away section through a joint of the line sections, showing the complementary V groove and tenon.

In the drawings, 1 designates the fire pot and ash pit section, 2 the feed door section mounted on the fire pot section, 3, 3, 3, 3, air flue sections mounted on the feed door section, one above the other, 4: a top section mounted on the top of the air flue sections and completing the furnace body, 5 a cylindrical casing inclosing the furnace body, 6 a dome for the casing having radial flue openings 7 for the attachment thereto of the distributing hot air pipes (not shown), 8 the feed door, 9 the ash pit door, 10 the smoke flue pipe, 11 the cold air inlet pipes, 12, 12, 12, 12, partitions radial to the casing and dividing the air space between the easing and the furnace body into four cham- Specification of Letters Patent.

Application filed March 29, 1912.

Patented Nov. 19, 1912.

Serial No. 687,006.

hers, 13, l3, l8, 13 the baiile plates directing the air currents through the flue sections 3, and 14 a front casing plate surrounding the door openings of the sections 1 and 2.

The .fire pot section 1, at the top, is provided with a flange l, projecting outwardly flush with the top of the section, the outer edges of the flange forming a square, and in the top side of the flange is formed a V- shaped groove g, parallel with the edges of the flanges, and the top section 4: is provided, flush with its bottom, with a flarfgc l, projecting outwardly, the outer edges of which also form a square of equal dimensions with the flange of the section 1, and the bottom side of the flange 4C is provided with a V shaped tenon bead 7) parallel with the outer edges of the flange 4, and of equal dimensions of the groove 9 in the top of section 2. The sections 3 are hollow squares of equal corresponding dimensions and are castings formed in molds made by the same pattern, and extending between the opposite sides 3 of each section, at equal intervals, are a plurality of hollow cylindrical flues f, having openings extending through the sides 3'. The tops of the sides of each section 3 are provided with a V shaped joint groove g, complementary to the V oint bead b of the top section i, and the bottom edges of each section 3 are provided. with a V joint bead Z), complementary to the V joint groove 9 of the section 2. Thus constructed, all of the sections 3, are interchangeable and adapted to be used in any position between the top section 4 and the section 2.

The lower section 8 is mounted on the to of section 2 with its tenon head 6 in the tenon groove 9 in the top of section 2, and with the fines f parallel with the feed door opening 8 of section 2, and the second section 3 is mounted on the lower section 3 with the fiues f at right angles to the fines of the lower section, the third section 3 is mounted on the second section 3 with the fines j parallel with the fines of the lower section 3 and at right angles to the fines of the second section 3, and the fourth and top section 3 is mounted on the third section 3 with the fines f at right angles to those of the third, and parallel with those of the second section, and each section has its joint bead b, fitted into the V groove 9 of the top of the next lower section, with plastic metallic cement in the grooves.

The top section at above the flange 4 is in the form of a truncated dome, and concentric to its outer wall 15 is the inner wall 16, integral with the top 17, and an annular bottom 18, forming with the outer wall 15, the top 17, and the inner wall 16, an annular flue chamber 19, having an exit flue opening 20, to which is connected the smoke flue pipe 10, and the radial slot openings 21 in the bottom 18 around the chamber 19, excepting a portion 22 extending a suitable distance each way from the flue opening 20, the slot openings 21 being equal in their combined capacity to the flue opening 20. Near the corners of the top sections 3, and opposite the parallel sides of the sections 3, are provided the clamp rods 23, which extend through alined orifices in the flange 4 of the top section 1, and the flange l of the fire pot section 1, the rods 23, having heads 24 at their top ends, and threaded end portions of their lower ends on which are run the nuts 25, by which the sections are firmly clamped together. The rods 23 are spaced from the sides of the sections 3, to receive the flanged inner edge portions 26 of the radial partitions 12, the outer edge portions 27 of which are angled to abut the casing 5 with the body portions of the partitions ex tending radial to the corners of the sections 3 and 2, and are broadened below the flange 1 and conformed to the contour of the fire pot and the square ash pit base of section 1. The partitions 12 divide the space between casing and the combined sections of the furnace body into four chambers a and a, and c and 0, the chambers a and a being opposite the ends of the flues f of the first and third sections 3, and the chambers c and 0 are opposite the ends of the flues f of the second and fourth sections 3. Opposite the joint between the first and second sections 3, in the chamber a, and extending between the partitions 12 and between the casing and the furnace body, is provided a battle plate 13, for the chamber a, which is adapted to direct air from the lower part of the chamber a through the flue f of the first section into the chamber a, and the chamber 0; is provided with a baflle plate 13, opposite the joint between the third and fourth sections 3, which is adapted to direct the air from chamber a back to the chamber a above its baffle plate 13. The chamber a is provided with a baffle plate 13 opposite the joint be tween the second and third sections 3, which is adapted to direct the air from below the baflie plate through the flues f of the second section 3, into the chamber 0', and the chamber c is provided with a baffle plate 13, opposite the joint between the fourth section 3 and the top section 4, which is adapted to direct the air from the chamber 0 back to the chamber 0, through the flues f of the fourth section 3. The cold air flues 11 enter the casing in the lower part of the chambers a and c, and they are preferably branches of a main supply duct, (not shown). Thus constructed, the heated gases generated in the fire pot, pass upward against the air flues f, in a tortuous course around and between the flues up to the top section 4, and their only escape being through the slots 21 in the bottom of the annular flue 19, they are prevented from passing direct from the fire pot to the flue opening 20, the effect of the slots 21 being to produce a more general and even distribution of the gases of combustion as well to the end portions of the flues as to their central portions, whereby the sides of the sections 3 are more highly heated, and the radiating surface of the furnace is greatly increased. The flues 7"", being also directly in the path of the heated gases, provide a largely increased area of heating surface, and the inner walls of the flues likewise greatly increase the radiating surface, and the air in the flues becoming highly heated produces a rapid circulation of the air from the chambers a and 0 through the flues f of the first and second sections 3, to the chambers a and a respectively, and from the chambers 64 and 0 back through the flues f of the third and fourth sections 3 to the chambers a and 0 above their respective baffle plates, and thence upward in the chambers a and 0 into the dome of the casing, and thence through openings in the dome and through hot air ducts to the rooms above. The baffle plates 13, in the chambers 64 and 0, and the top of the section 4 con centric to the flue 19 also increase the area of heating and radiating surface, directly contributing to the heating of the air in the dome of the casing.

The furnace thus constructed may also be made adapted to maintain a supply of hot water by extending a water service pipe 28 back and forth through the flues of one or more of the sections 3, as shown in Fig. 5.

It will thus be seen, that by the construction shown and described I have produced a furnace, wherein the heating surfaces are brought more directly across the path of the heated gases of combustion, and the air to be heated is brought more directly in contact with the radiating surfaces, whereby a greatly increased percentage of the heat generated in the fire pot, are absorbed by the air of circulation before the gases of combustion reach the smoke flue 10.

l Vhile the portion of the fire box, between the fire pot section and the top section is preferably constructed of the separable sections 3, it is manifest that a single casting comprising the air flues f, arranged as described, may be substituted for the sections 3, without departing from the principle of construction and operation of my furnace, and I therefore do not limit myself to the use of separate sections.

What I claim to be new is,

1. In a hot air furnace, the combination with a fire pot section, having a flange forming a square around its top portion, of a fire box mounted on the flange of the fire pot section, and having sides that are square in horizontal cross section, and a top that is in the form of a truncated dome, said top having an annular Hue concentric within the dome wall, said fiue having a multiplicity of slot openings in its bottom, and a main fine opening through the outer wall of the dome, and each opposite pair of sides of the fire box having an upper and lower series of air Hues extending parallel and horizontally through the fire box and the sides, the series of fiues of one pair of sides alternating with series of fiues in the other pair of sides, and being at right angles thereto in direction, a casing inclosing the furnace thus formed, vertical partitions opposite the corners of the fire box dividing the air space between the casing and the furnace int-o chambers, one opposite each side of the fire box, a bafiie plate horizontally dividing each chamber, and relatively arranged in opposite chambers to direct the air from one chamber through the lower series of fines to the other chamber and back to the first chamber through the upper series of flues, and an air supply duct connected to the two chambers having the lowermost battle plates.

2. In a hot air furnace, the combination with a fire pot section having a flange around its top portion, with the outer edges of the flanges forming a square, of a fire box comprising a feed door section adapted to be mounted on the fire pot section, and a plurality of equal interchangeable square sections mounted one above the other on the feed door section, each square section having a plurality of air flues extending horizontally between and through two of its opposite sides, and a top section. having a dome portion provided with a bottom flange adapting it to be mounted on the upper square section, and having an annular flue concentric to the wall of the dome, said fine being provided with bottom slot openings radial to the dome, and with a main flue opening in the outer wall of the dome, said square sections being each arranged with its air fines at right angles to the next lower or next higher square section, clamp rods extending through the flanges of the top and fire pot sections opposite the corners of the fire box, a .asing inclosing the furnace thus constructed, vertical partitions extending from the corners of the firebox to the casing, and forming separate air chambers, one opposite each side of the fire box, a baftle plate horizontally dividing each air chamber, one of said baflie plates of each opposite pair of chambers being above the lowest row of fines opening into one chamber of the pair, and one above the highest row of fiues opening into the opposite chamber of the pair, and air supply ducts connected to the air chambers having the lowest and next lowest bafiie plates.

In testimony whereof I have hereunto set my hand, at Toledo, Ohio, this 28th day of February, 1912, in the presence of two subscribing witnesses.

CI-IARLES H. LEE.

In presence of MARK Vnvonnsrnn, FRANK W. MAOPHIO.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

Images