US1828221A - Air feed mechanism for hot air furnaces - Google Patents

Description

Oct. 20, 1931. s. BORDO 1,328,221

AIR FEED MECHANISM FOR HOT AIR FURNACES Filed Nov. 27, 1929 2 Sheets-Sheet 1 SAMUEL I. BORDO dmm Oct. 20, 1931.

S. l. BORDO AIR FEED MECHANISM FOR HOT AIR FURNACES Filegl Nov. 27, 1929 2 Sheets-Sheet 2 UNFTED STATES SAMUEL I. BORDO, OF CLEVELAND, OHIO AIR- FEED MECHANISM FOR HOT AIR FURNACES Application filed November 27, 1929. Serial No. 410,102.

My invention relates to mechanism for im proving the air circulation for hot air furnaces and I do this by forcing the incoming air into the annular space between the wall of the fire pot and the outer casing by suitable power means, such as a fan driven by electrical power.

It is a special object of my invention to di rect the outside air into the above annular 19 space by branch pipes connected with an outer main pipe connected with the power fan, and provide the branch pipes with upwardlydirected tubes extending just above the in tensely-heated fire pot, so that the incoming air from this force feed will never be direct ed upon the lower portion of the fire pot.

it is a further object of my invention to form the said branch pipes of tubular sections pivoted together at their ends to permit adjustment of the curved outline of these branches to fit furnaces of different sizes, and of possible different shapes. It is a further object also to make these sections detachable to vary the ultimate length of the branches.

This invention will hereinafter be fully described in detail, particularly pointed out in the appended claims, and illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of a furnace with a portion of the outer casing broken away to show the position of the structure of my improved mechanism in the intermediate space between the outer casing and fire pot;

Figure 2 is a side elevation of a single section of the feed pipe;

i ure 3 is an elevation of such a section not provided with one of the vertical tubes;

Figure at is a transverse section of the fur nace taken in the plane indicated by the line of Fig. 1;

Figure 5 is a side elevation of my sectional feed pipe unassembled in operative position, but having the sections swung on their pivots into alinement;

Figure 6 is a longitudinal section of two connected sections, as shown in the plane indicated by the line 66 of Fig. 5;

Figure 7 is a similar view of a pair of sections bent out of alinement, and

fire pot 13 shown as supporting the combined structure 1% having the smoke flue 16 and cleanout pipe 15.

My air feed mechanism will comprise a cold air intake pipe 17 which is designed to introduce cold air to be heated by the furnace, while in the space between the casing 11 and the fire pot 13 and thereafter forced upward into the hot air pipes 12 which lead to the various rooms to be heated. It further comprises an electric blower 18 of a conventional type whose power is obtained by suitable connections 19 carrying appropriate current from the usual power source, the incoming air entering at the opening 20 opposite the motor 21, and thence forced through the pipe 17 into a sectional distributing tubular member 22 made up of sections 23 and 24 pivoted together at 25 and extending around the fire pot from a central section 26 which receives the incoming air directly from the pipe 17.

The sections 23 and 24 are duplicated over and over in as great a number as desirable, depending partly upon the circumference of the fire pot and also upon the length of each section. The entire sectional pipe therefore, consists of two flexible members 27 and 28 extending from the section 26, and each member ending with a section 29 having a closed end 31 near the position of the furnace door 30. Each of the sections 23 and 24 will ordinarily have a small and a larger end to render it feasible to telescope the smaller end 32 of one section into the larger end 83 of the next, the two sections being held in such telescoped relation by pivot plates 34 having their ends riveted to the outer wall at 35, as well shown in Fig. 8 of the drawings. These plates 34 are 0 -set, as shown in Figs. 2 and 3, to readily make the connection desired.

The middle section 26 will have bothv ends of equal size to enter the sections 21 of the members 27 and 28. The length of each of the latter members may be varied by omitting or adding certain sections.

A serious defect of former air circulating attachments of this general type lay in the very general positioning of the discharge device, heretofore thought essential, in the lower portion of the space between the tire pot and the outer casing. It has often been thought advisable to direct the incoming air from the discharge ()1)QI1lI1,Illlill attachment directly against, or closely adjacent to the highly heated lower end of the fire pot, on the assumption that the incoming air would thus be very highly heated it passed up Ward about the furnace and into the hot air fines. But this con truction it has been found is apt to result in injury to the walls of the fire pot by the expansion and contraction resulting from the forcing of the incoming cold air upon the outer surface of these walls, and the varying temperature of such fresh air as Well as the varying force of the current depending upon the power employed.

-My improvement is therefore, especially designed to provide means for forcing the in coming air from the main discharge member into the space about the fire pot, but at points above the plane to which the burning fuel extends, and at the same time preserving most of the advantages arising from positioning the main discharge member low in such air space. I have shown in these drawings a serles of vertical pipes 36 which are directly attached to certain of the said pipe sections, such as those designated by the numeral ii. The lower end of these pipes will be outwardly flanged, as at 37, to provide a riveted joint with the section, as shown in Fig. 2. These pipes will be of such length that their upper ends 38 which are open, will rise above the larger portion of the fire pot, so that, while the incoming air rising through these ipes will be partially heated before escaping from such open ends, it will not be directed against the walls of the fire pot.

These pipes 36 may be attached ti, any umber of the sections of my sectional d1 lTllJLlhing member 22, including the end section s 29; and if the several scctimis are imatively short, a given length of the main distributing member will require a lar or number of sections, and fewer of the ctions will need to be provided with the pipes 36. For illustrative purposes only I have shown the members 27 and 228 made up of sections *5 and whose alternate sections 23 support no air p;ipes,only the sections 2-1 being thus provided. In any case. the pipe 17 will enter the aperture 39 in the casing andv connect directly with the intermediate section 26 within the air space, and the remaining sections of the members pivoted in alternate arrangement. The entrance aperture 3.) may if necexsary, be positioned other than at the pointdirectly oppo site the door 30, since all of the sections will be fed by the main pipe 17, wherever it may enter the casing.

Since the several sections of my distributing member are pivoted together, the curve of such member will vary with the adjustment of the sections on each other, and at the same time carrying with them the vertical pipes 36 which will assume the appropriate position about the fire pot, as determined by the position of the main pipe The members 27 and 28 need not be arranged in a pronounced curve or are, but may evidently, be extended in arcs of small radius, or even in a substantially straight length, as shown in Fig. if an elongated space is to be fitted with such attachment. The varied size and numher of sections and their pivotal connection, makes possible their assemblage in ohl hotair furna .:es as well a: in new structures.

While I have shown the smaller end of each section 235 ano ll, very much smaller than the other, this is to be considered merely a matter of degree, the difference in size being such a: to permit swinging of the sections upon. their pivot, as shown in Fig. 7, but the l li'ciewcr in 'viI A' should not be too great, so

as to cause too great leakage at the joint. If

however, there is a slight leakage at these joints, other heavy cold air will rush in at such jointsv and pass upward through the ipes 311. All or only a few of the sections may be provided with such pipes, and the latter will usually be shaped of uniform size throughout their length, and will ordinarily have an unobstructed orifice at their upper ends.

Operation: Assuming that the furnace 10 includes the outer casing 11 and the fire pot l3 properly assembled, and that the tire pot 13 includes a lower portion in which the burning fuel is supported and an upper portion receiving smoke and other as well as flames from the fuel, the two portioi'is of the fire pot ordiiun'ily connected together as at -11), the blow p p-1* 17 is directed through the casing in the aperture 39, and the two members QT and 29 of the harge tube directed oututtrdly and around the lower portion of the the pot, for as long an are as it is desired, the pipes 36 extending upwardly from the incmliiers QT and 28 just above the plane of the connection -10, the blower 18 is driven by the motor 21 whereby the outer cold air rushes in through the opening 20 and then forced by the blower 18 into the pipe 17, and

thence to the tube The air in the tube 22 and in the pipes $3") is being heated by adiation from the lower portion of the [ire pot 13, but no direct air current is forced against the walls of the fire pot, so that the latter will not be broken by the sudden rush of air against the intensely heated furnace walls. 7

The air rushing out through the orifices in the ends 38 of the pipes 36, will be heated to a high temperature by its flow through such pipes and sections which are so closely adjacent to the fire pot, but not in contact therewith. From the ends 38, the air will then be forced upward by the heavier cold air below, and be directed to the several rooms of the dwelling by the pipes 12 of the casing. The upper portion of the fire pot 13 will of course, increase the temperature of the warm air from the pipes 36, but this part of the fire pot is not likely to be injured by such air current, since it is above the level of the burning fuel and will not be subject to extreme expansion and contraction.

The members 27 and 28 may well be supported upon standards 41, or by any means of holding such members with their attached pipes 36 in proper position in the space about the fire pot. This improved air feed mechanism meets a very serious condition which I have observed in attempting to improve the circulation of the outer air within the casing up through the carrying pipes: It is well known that the speed of the incoming air current can be increased, and has been done by devices similar to the blower 18 of my structure, but it has not been heretofore fully appreciated that forcing the air against the fire pot has wrecked such fire pots, and that the only means of correcting it in the past, seems to have been to lower the speed of such air current. My improve ment therefore, enables the user to increase the incoming air current, without injury to the furnace, however great the speed of the current may be, or how intense the heat of the wall of the fire pot may become. By employing my improved structure, changes in the heat in the fuel portion of the fire pot, however sudden, as by operating the drafts, will not endanger the fire pot walls, whether the motor 21 is running at high or low speed.

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

1. The combination with a furnace having an air chamber between the fire pot and the casing of the furnace, of an air tube positioned in the lower portion of said chamber, hollow pipes connected at their lower ends with such tube and having their open upper ends extending in said chamber above the level of the lower wall portion of the fire pot, and mechanism outside the said casing for forcing the outer air through an aperture in the casing into the said air tube.

2. The combination with a furnace having an air chamber between the fire pot and the outer casing of said furnace, and a sectional air tube positioned in the lower portion of said chamber of vertical hollow pipes connected at their lower ends with such tube and having their open upper ends extending in said chamber above the lower wall portion said casing for forcing outerair through an aperture in the casing into. one tions of the said air tube. a

3. 1 The combination'with a hot air furnace having an air chamber between the firepot and an outer casing, a sectional cool airtube positioned in the lower portion of said air chamber, and vertical hollow pipes connected to certain of the sections of said tube and having their open upper ends extending in saidair chamber above the lower Wall por-.

tion of the fire pot, so that air from said tube and pipes will not be directed against the lower wall portion of the fire pot, of a blower device outside said casing for forcing outside air into the said sectional tube.

, 4. The combination with a furnace having an air chamber between the fire pot and the outer casing of the furnace, a sectional air tube positioned in the lower portion of said air chamber the sections of said air tube be-; ing connected together end to end in pivotal relation so that the tube may be positioned adjustably in an arc in said chamber, certain of said sections supporting on their upper surface vertical hollow pipes having their lower ends connected with the respective sections and their open upper ends extending above the base portion of the fire pot, so that air from either said tube nor pipes will be directed against the lower wall of said base, of a tube leading through an aperture in said casing and connecting in said chamber with one of said sections, and a blower device for forcingioutside air into said casing tube.

5. The combination with a furnace having a heating chamber between an inner heating element and an outer surrounding casing, and a sectional air tube positioned in the lower portion ofsaid chamber, of a blower device for forcing outside air into said sectional tube,and means attached to said tube for directing air therefrom upwardly in said chamber into the upper portion of the latter, but out of contact with the lower portion of said heating element.

6. The combination with a hot air furnace having a heating chamber between an inner heating element and an outer surrounding casing, and an air tube positioned in the lower portion of said chamber, of a blower device for forcing outside air into said air tube, and means attached to said tube for directing air therefrom upwardly in said chamber into the upper portion of the latter, but out of contact with the lower portion of said heating element.

7. The combination with a hot air furnace having an air chamber between the fire pot and an outer casing, a sectional cool air tube positioned in the lower portion of said air chamber, the sections of said air tube being connected together end to end in pivotal relation to permit adjustment of the tube in an of the fire pbt,;a'i1'd mechanism outside the.

of the sec-.

4 smash be about said fire pet, of a, blower device outside said casing for forcing outer air into sectional tube, and spaced tubes: con; nected at their lower ends with certain 02B saidsaetionsandaentendin upwardly beyond than level at the intenselyeated base of'the fine-plot, for directing from the said sections aim tn the upper portion of said chamber, but out 05 contact with the said base ofi the pot.

8: The combination with a hot air furnace and its fire pot and a cool air intake pipe, oi useetional aintube supported in the space be-. m the said: fire pot and its outer casing,- one- 01 the intermediate sections being con-. wanted with said intake pipe, and the end sew tions havingolosed outer ends, a plurality oi nominal having their lower ends attaehod' to certain of said sections, and their an upper ends extending above the level of most intensely-heated portion of the fire EM, whereby the air in said pipes will be noted by radiation from the base of the fire but will' not be directed against the wall 0! thelatter, and a blower arran ed for connod-ion with the receiving end 0 said intake P 9: Thecombination with a hot air furnace haminga heating chamber between an inner heating element and an outer surrounding easih and a sectional air tube positioned in the lower portion of said chamber, tubular mechanism outside the said casing leading through an aperture in the casing into one of the air tube sections, and means attached to certain of said sections for directing air therefrom upwardly into the upper portion of said chamber, but out of contact with the lower portion of the said heating element.

Iii-witness whereof I have hereunto set my hand this 26th day of November, A. D. 1929.

SAMUEL I. BORDO.

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