US1525419A - Air heater and inducer for furnaces - Google Patents

Description

Feb. 3, 1925. 1,525,419

E. H. SWIFT AIR HEATER AND INDUCER FOR FURNACES Filed July 1 1923 mum- A iii" . EdwinHSwi i. 61 $51 Snow; I f

gnvcmboz a furnace.-, A fifth object of the invention Patented Feb. 3, 1925.

EDWIN H. SWIFT, OF BROOKLYN, NEW YORK.

AIRHEATEE AND INDUGER FOR FURNACES.

Application filed. July 18, 1923. Serial N0.'G52,362.

To all whom it may concern:

Be it known that I, EDWIN H. Swrr'r, a citizen of the United States, and resident of the borough of Brooklyn, city of New York, in-the county of Kings and State of NewYorlnhave invented certain new and useful Air Heaters and Inducers for Furnaces, of which the following is a specifi cation.

This invention relates to an air heater and inducer for a furnace;

The object of the invention is thepro'duction of a device and a. method, by means of which heated air is supplied to the unconsumed products of combustion of the fuel of a furnace to secure complete combustion. A second object of the invention is to provide heated air to the burning fuel of a furnace at a velocity of inflow, by means of which the oxygen of the infiowingair will combine with the unconsumed gases generated. and therefore not chill the bed of the fuel in the furnace. Athird object ofthe invention is the production of means and steps whereby all portions of an inflow of air to the combustion chamber of a furnace is heated, before mixing with the gases generatedtherein. A-fourth object of the invention is to prevent the escape of obnoxious gasesfrom the combustion chamber of is to provide means, whereby 'an inflow of air. for the combustion chamber o-f a furnace is discharged therein in all portions thereof.

The organization of the invention comprises an induction tube for an inflow of air,

adjustably connected to the door of a. furnace and of a length to enable the air that flows therethrough, to be discharged between the axial center of the furnace and the frontwall thereof. A heating coil is located in the tube to give the inflowing air a twirling movement, and openings are formed in the-induction tube for the inflow of heated air and gases to the inside of the said tube, to mix with the air flowing there through, before entering the combustion chamber of the furnace. in addition to the heat that is transmitted from the fuel of the furnace through the wall of the induction tube. r v t I In the accompanying I drawings Fig. 1 represents a vertical axial section of-a portion of a furnace, with aside elevation of the air heater and inducer, indicated in full lines in its operative position, with the barrel oft-the latter indicated in its withdrawn position in dotted lines, Fig. 2 shows an enlarged top plan view of the air heater and inducer; Fig. 3, indicates a partialsection of Fig. 2'on the line 3, 3; Fig. 4 represents a left hand side view and section of Fig. 3 on the line 4, 4 and Fig. 5 shows a 6 section of Fig. 3 on the line 5, 5.

In general terms the air heater and inducer comprises an induction tube desig' nated in its entirety by the letter A, which has detachably connected thereto. at its outlet end the flared outlet nozzle designated in its entirety by therletter B. A heating coil designated in its entirety by the letter C, is detachably secured within the induction tube; The induction tube A is detachably supported upon the arcuate support designated in its entirety by the letter D. and

is detachably fastened to the door ofthe furnace for which the air heater and inducer is used.

A furnace is indicated in its entirety by the letter F, and comprises the combustion chamber 20. the grate 21, the front wall 22, the rear wall 23, the ash pit 24,'the furnace door 25, the furnace door opening 26, the ash pit door 27, and the ash pit door opening28. l m

The induction tube A is preferably cylindrical and has formed therewith at one end the flared inlet nozzle 30. Rectangular inlet openings 31 are formed in the lower position of the tube'A and openings 32 are formed in its sides, while pairs of openings 33, 34. .35 and 36 are formed in the crown and bottom of said tube. A damper 38 is provided for the tube -A adjacent to the inlet nozzle 30. The damper-is supported on the spindle 39. the ends of which are journaled in the wall of .said tube. An operating endofthe spindle 39', and extension 42 is fastened to the other end of'the said spindle. Longitudinal supporting and track flanges 43. extend from the sidesof the tube'A and a bearing discflange 44 also extends from said tube.

The flared outlet nozzle B has formed therewith the sleeve 45 having, openings 46. A split pin 47 extends through the openings 46, and in this instance through the openings 35, 36 of thetube A, to detachably secure the nozzle B to said tube.

The heating coil Q in this instance com an arm 41 with an prises a'coreof;a pair of wires 48; 49 wound on each other and has formed at one end an eye 50 used for handling the coil, while adeye 51. The coil in this instance is double threaded and consists of-a series ofri-ngs- 54 extending from its core. The rings follow each other in a helical-direction in said induction tubeA, from adjacent to the door 25 locking ring,68 has'extending therefrom the annular locking flange 69, and, an operating: lug 70 with the locking shoulder 71 is formed with the locking ring 68. V The lock? ing ring 68 is hinged to the hingepmember 61' byv means offthezhinge bolt .72, which latter also extends throughthe door 25.

The front plate 61 is, fastened to the furnace door 25by means of the bolts 7 4.

Theinduction tube A, is seated in the arcuate member 60 D, with its flange outer face of the frontplate 61 above the annular flange 62. a

The locking flange 69 of the, locking ring 68 is swung to its closed position to lock in place the flange 44 of the tube A, the operating lug 7 04 being located beyond the stop lug 64.

To swingthe door 25 of the furnace. F to either its. open. or closed position, the flange 44 of the tube A is unlocked from the door 25, by swinging up the annular locking ring 68, and moving the induction tube outwardly as indicated in, dotted lines in Fig. 1, so; that the outletnozzle B" will clear and swing in the furnace/door opening26'. V l

To use the air heater and inducer, the door 25; of'the' furnace F is .opened and the induction tube A is located upon the supporting; and track flanges 43,0f" the arcuate support D', in its withdrawn positionasindica ed, in dotted lines in Fig. 1, afterwhich the door 25 is closed. Next the locking uring is swung to its closed position, so that the locking flange 69 thereof will lock the disc flange 44 Of'the induction tube in place. The length of the said induction tube is preferably made to-locate'the outlet end of the outlet nozzle Bvbetween the axialjcenter of the-furnace-and its front wall22. The damper 38 is now swungopen to permit the required volume of air to, flow through the induction tube int-or the combustion chamber 20 at the requisite velocity. The Y air as it acent to the other endzis-formed as second .of the arcuate support 44 hearing against the .said tube h means the induced air isthoroughly-heated throughout all portions thereof, before it enters the combustion chamber 20' of the furnace F, and is delivered in proper condition therein, for the,combustion of" its oxygen with the unconsumed' gases ofthe products of combustion. By this means perfect GO'HIbLIStlOII'lS obtained with a great saving of fuel andobnoxious gasesare; pre

vented. from escaping from the furnace. The arcuate support D slidably supports the induction tube A, so that, the outlet end of the outlet nozzle B can be-locate'd between the axial center ofi thefurnace F and its front wall, to distribute the strea-m of induced air to all portionsjof, the combustion chamber 20; andi to be enabledto locate said induction tube in its withdrawn position, when the door,25 ;vof"thevfurnac e is to be opened or closed." 7

i It will [be noted that the heating coil C in the-inductio-ntube AXislocked thereto some ,distance'back from theouterendlthereof, through the second eye 51, to beenabled to extend the windings-of the; coil to the outer end ofjthe tubeAi B'y' this constru'c tion practicallytl1e;whole heating valueof the coil is obtained Various modifications-may be madein the invention without departing-from the spirit thereof, and the present exemplification is; to be taken as illustrative and not limitative.

Having described my invention what I desire to secure by Letters-Patentandclaim 1s:-

1. In an air heater and ind'ucer the-combination of an induction tube extending through an opening in the door'of a furnace, said tube having openings in its wall," an outlet nozzle detachably connected to the outlet end of the tube, a heating coil d'e tachably secured in the induction tubesaid coil comprising'a core withaseriPs-ofrings extending therefrom, said rings following each other ina helical path, and meansto detachably lock the induction tube to the door of the furnace.

2.,In an air heaterjand inducer the combination of aninduction tube extending through an opening in theidoor of'a furnace, aving openings in its wall, an outlet nozzle detachably connected to" the outlet end of the tube, a heating coil detachably secured in the induction tube said coil comprising a core with a series of rings extending therefrom, said rings following each other in a helical path, a damper in the tube and a locking device to lock the induction tube to the door of said furnace.

3. In an air heater and inducer the combination of an induction tube extending through an opening in the door of a furnace, said tube having openings in its wall, an outlet nozzle for the tube, a helical heating coil in the tube extending from adjacent to the door of the furnace to the end of the tube said coil comprising a core with a series of rings extending therefrom, said series of rings following each other in a helical path, means to detachably lock the coil at a distance spaced from its end of the tube and means to detachably lock the induction tube to the door of the furnace.

4. In an air heater and inducer the combination of an induction tube extending through an opening in the door of a furnace and having a 'disc flange and supporting and track flanges extending therefrom and having openings in the wall thereof, an outlet nozzle detachably connected to the outlet end of the induction tube, a heating coil detachably secured in the tube, a plate with an annular flange fastened to the door of the furnace, an arcuate support extending from said plate through the opening in the door of the furnace and a locking ring with an annular locking flange hinged to said plate, said induction tube located upon said areuate support with its flanges bearing on the side edges thereof, and the annular flange of said plate and the flange of said locking ring locking the disc flange of the induction tube to the door of the furnace.

Signed at the borough of Manhattan, city of New York, in the county of New York and State of New York, this 28th day of June A. D. 1923.

EDWIN H. SWIFT.

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