US1603925A - Heating furnace - Google Patents

Description

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, I J- R. SANDAGE flEATING FURNACE Filed March 9, 1925 2 Sheets-Sheet 1 J EGQZRSQ/ZQ /Q @m? W Oct. 19,1926. 1,603,925

J. R. SANDAGE uA-mq roams Filed March 9, 1925 2 Sheets-Sheet 2 Jacob J? a/wfcggz Patented- Oct. 19, 1926.

UNITED STATES PATENT OFFIQE.

JACOB R. SANDAGE, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO WARREN R.

SANDAGE, OF CHICAGO, ILLINOIS.

HEATING FURNACE.

Application filed March 9, 1925. Serial No. 13,946.

This invention relates to furnaces for heating houses and buildings, and more particularly to those which employ some means for heating air for this purpose, and for circulating the air through the furnace and into the rooms to be heated.

Generally stated, the object of the invention is to provide a novel and improved construction whereby the air will be brought into the furnace and taken across the same, close to the lire, directly above the fire pot of the furnace, so that the air will be more intensely heated, and whereby a smaller fire will be more effective in heatin the air. and

" whereby even an oil burner or a gas burner.

when placed in the fire pot, will be more efficient for the heating of the air than is pos sible with the ordinary construction of coalburning hot air furnace.

It is also an object to provide certain details and features of construction and combinations tending to increase the general efficiency and desirability of a heating furnace of this particular construction.

To these and other useful ends, the invention consists in the matters hereinafter set forth andclaimed, and shown in the accompanying drawings, in which:

Fig. 1 is a vertical section of a hot air heating furnace embodying the principles of the invention;

Fig. 2 is a horizontal section on line 22 'F-ig. 3 is a horizontal section on line 3-3 in Fig. 1.-

As thus illustrated, the invention comprises an outer furnace casing 1 of any suit- ;able or desired form or character, together with a fire pot 2, of any suitable or desired character therein. An upper door 3 is provided for the introduction of the fuel into the fire pot,and the lower door t. is provided for the withdrawal of the ashes which are dumped into the ash pit below. pipe 5 is provided, as shown, leading from the upper portion of the casing of the furnace, thereby to provide an outlet for the a smoke and products of combustion.

A heating drum 6 is provided in the upper portion of the casing, as shown, with space 7 between the sides of the drum and the casing-of the furnace. This drum has its up per portion enlarged and provided with one or more outlets 8 for the escape of the heated air. The lower portion of the drum is pro A smoke culates around the fire pot 2, and around the lower portion of the wall 13 of the furnace casing before being drawn into the space 10, and from the latter into the heating drum 6, previously mentioned. Thus, the air is first heated by circulation around the fire pot, and is then heated in the drum 6, and it will be observed that when the air enters the drum, it does so directly over the fire and directly over the bottom wall 14 of the heating drum, where the heat is most intense, raising the air to a high temperature in the bottom portion of the drum. The smoke and products of combustion pass upwardly in the space 7, thus heating the sides of the drum 6, so that the interior of the lower portion of the drum is subjected at all sides thereof, and below, to the full force of the heated gases rising from the fire.

\Vith this arrangement, therefore, a smaller-fire can be employed, and, if desired, an oil burner or a gas burner may be used effectively in the fire pot. In other words, the air is given a preliminary heating around the outside of the fire pot, and is then in tensely heated when it enters the lower por tion of the heating drum, directly over the fire, andwith an arrangement of this kind, involving the bringing of the air very close to the fire, it is obvious that the air can be effectively heated with less fuel than would be required with some other constructions.

It will also be observed that the air is taken into the heating drum 6 in a manner to keep the bottom thereof from burning out, inasmuch as the air, although it is heated by circulation around the fire pot, is at a relatively low temperature when it enters the bottom of the drum, and the baffle 9 keeps the air that has just entered down against the bottom of the drum in a manner to prevent the bottom wall of the drum from burning out. Of course, this bottom wall of the drum can be made of any suitable known or approved material, and can be made of some special material which will not be liable to burn out even though the air were not being circulated throughout the furnace.

The lower portion of the furnace It willbe understood, of course,that the drum 6' isgas-tight, so that no gases or prodnets of combustion rising with the fire can enter and mingle with the air. The bottom Wall 14: of the drum is inipertorate, and hence the space 7 constitutes the only passage for the smoke and products of combustion'upwardly to the smoke pipe 5 through which the smoke is allowed to escape from these" plates form the top and bottom walls of the lateral intake of thedrum. This leaves thetrontportion of the space between the loweredge ot the drum and the upper edge ot the fire pot open, for the upward passageot' the smokeand gases, and the latter then pass over the plate 14 into the smoke pipe, which latter is directly above the said'intake of the drum. Thus the air enters thedrui'n and spreads out upon the fiat back wall thereof, so as to receive the maximum heat from the fire upon entrance into thedrum, and thebafile 9, which is in the plane of the top plate 14 ot the intake, tends tokeep the incomingair downupon the bottom wall of the drum to not only heat the air effectively, but also to keep the said bottom wall 1th from becoming overheated and burning out, the air entering and absorbing the heat so promptly that the temperature of the bottoin'wall is muchless' liable to burn out 'than'inight otherwise be the case it it t'y'GlQIiOt constantly giving up its heatto the incoming air.

out prejudice to any novelty disclosed, what I claim as my invention is:

1. In a heating furnace for heating air, the combination of a furnace casing and a fire pot therein, an air heating drum suspended in the upper portion of the furnace casing, with its bottom wall concentric to the top of 'said fire pot, forheating all the air passing through the furnace, and of less diameter than the top'of'tlie fire pot, and disposed position directly over the fire pot, "said drum having an intake directly ove 'tlie rear edge of the fire'pot tor admittiiignii-"laterally through the side of the lower portion of the heating drum, so that the air enters and spreads directly over and upon said bottom wall, whereby all air taken in and heated by the furnace must pass through said drum, with space around the outside of the'druin for the passage of smoke and the products of combustion, a smoke pipe leading from the upper portion of said space around the outside of the heating drum, whereby the bottom and sides of said drum are heated, and an outlet for the upper portion of said drum, forming a hot air ofi'- take for the furnace, whereby only air passing through said drum can escape through said'oil'take, said intake closinga portion of the annular space between the drum" and the upper edge of the fire pot, leavin the front portion of said space unobstructed to permit upward escape of the products of combustion 'froin the firepot, anda top wall for said intake over said closed portion of said space,

over which top plate the products of coin bustion pass to said smoke pipe. 7 V

2. A structure as specified in claim 1, lIl combination with a. horizontally disposed bafile in said drum, in theplane of said top wall, immediately above the lateral airin take thereot, whereby the air enters" and flows across the bottom wall of the drum, and then rises betwe-eii"tlie farther side of the drum and tie edge or said battle.

3. A structure as specifiedin claim 1, in?

combination with means for the passag e of air around the outside of said fire pot," before the passageot' air into the drum through the said intake thereof, thereby to preliminarily heat all of the air passing throughthe furnace, betore'it enters said drum.

'4. A structure asspecified in claim 1, comprising instrumentalities for admitting the air and first circulating it around thefire pot, before the air passes 'into' said drum,

thereby to preliminarily heat allot the air passing through the furnace, said instru mentalit es including a horizontally "disposed b'afile extending partially around the fire pot, below said intake of the drum, Without disclai ning anything, and withwhereby the air is caused to enter atone side of the base portion of the furnacecasing,

below said intake of the drum, and then travel across to the other side, at each side of the fire pot, andthenupwardly'betweeii the rate, and said space around the outside of the drum constituting the only'pa ssage for the smoke and products otcoinbustion upwardly to the smoke pipe, therebeingfan air' heating chamber overhanging the top of said smoke space, forming an' e'nlarged head 'for" said drum.

Specification signed 7 this. Qn k bf March, 1925. V y

' JACOB 'RJSANDAGE.

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