US1487612A - Furnace - Google Patents

Description

March 18, 1924. 1,487,612

"r. SEBRING FURNACE Filed March 7, 1921 s Sheat-Sheet 1 II M H l I l March 18 1924.

' 1,487,612 T. C. SEBRING FURNACE Filed March '7, 1921 I5 Sheets-Sheet 2 March 18, 1924. 1,487,612

T. c. SEBRING FURNACE Filed March 7. 1921 3 Sheets-Sheet '5 Patented Mar. 18, 1924.

UNITED s'rara rHEosIso. sEBRINe, or ivronnnor. MICHIGAN.

FURNACE.

Application filed March 7, 1921. 7 Serial No. 450,274.

To all whom it may concern:

Be it known that I, THEOSIS C. SEBRING, a citizen of the United States of America, residing at Morenci, Lenawee County, Michigan, have invented new and useful Furnaces, of which the following is a specification.

This invention relates to fuel burning apparatus, more particularly hot air furnaces, and aims to provide a novel and improved structure of that kind.

One of the more specific objects is the provision r novel means for loosening the fuel in the fuel reservoir above the fire pot should there be a caking or coking of the fuel at the wall or walls of the reservoir.

Another object is the provision of novel grate shaking means for shaking grate sections simultaneously as a unit or relatively to one another.

A further object is to provide a chamber surrounding the fire pot through which the products of combustion pass, with means for the passage of air to be heated by the products of combustion in said chamber.

A still further object is the provision of an air chamber within the fire pot constructed for the fiow'of air into the fuel surrounding said chamber, and for the separate flow of air in hollow bars of said chamber for air heating purposes.

Referring to the drawings Fig. 1 is a side elevation of an embodiment of the invention in a hot air furnace,

portions being broken away and shown in section; V r

Fig. 2 is a horizontal section of the furnace of Fig. 1, parts being broken away to show their relation in various sections thereof;

Fig. 3 is a plan view ofthe grate;

Fig. 4 is a perspective view of one of the bars for the air supply chamber;

Fig. 5 is a section of another form of air supply chamber with return travel provision through the hollow bars thereof;

Fig. 6 is a detail view in section of a modified construction of firepot and air chamber;

Fig. 7 is a view similar to Fig. 6, of a further modification in the air chamber;

Fig. 8 is a detail view of another form of firepot capacity adjustment by shifting the grate as'to the firepot; and

Fig. 9 is a perspective view of a shaker for thegrate of Figs. 1, 2, 3.

I The hot air furnace jacket or casing l is shown as provided with a door 2 for the introduction of solid fuel'into a. reservoir 'or magazine3, disposed above and registering with a firepot 4 therebelow. Fitting ring 5 so that the prongs 6 may loosen fuel,

should there be a tendency of such fuel to cake or coke against the reservoir wall and not freely feed down from said reservoir.

Below the firepot 4 is disposed a grate comprising lower section 10 and upper section 11. The lower section 10 has the sectorshaped openings 13 and arcuate slots 12 between them, while the upper section 11 has arcuate slots 14 normally above the openings 13 of the grate section 10 and sector-shaped openings 15 normally above the slots 12 of the grate section 10. The grate section 10 has a projecting arm 16 under a projecting arm 17 of the grate section 11. For shaking the grate there is provided a shaker 18, Fig. 9, having a pivot pin 19 which may enter opening 20 in the armv 16. This shaker 18 has a U-portion 21 which may fit over the arms 17 and 16 of the grate sections and when so mounted the arms 16, 17, are operated together as a unit in shak ing this grate structure. VVhenthe shaker 18 is turned the'other side up and the pin 19 is in the opening 20 of the arm 16, a pin 22 of the shaker may enter slot 23 in the arm 17 andoperation of the shaker 18 will now result in simultaneous opposite or relatively opposite shifting of the two grate sections for shearing or more efiectively loosening ash' or clinker accumulations. Such material passing through these grate sections 10, 11,1 enters chamber 24 from which it maybe passed by rocking doors 25 on their bearings 26. The ash is thus dumped into lower ash pit 27 from which it may be removed by opening ash door 28. Air supply may be permitted through controllable damper 29 in the ash door 28, this air supply passing by way of central up-sha-ft 30 into an air chamber 31 having the top closure portion '32, and lateral openings 33 for the flow of air from within the air chamber through said openings into the fuel surrounding said chamber, the chamber being located centrally within the fire pot. The air flows radially from the openings or slots 23 laterally through the fuel, and the wall of the fire pot 4 has the slots or openings 34 for the radial outlet of the products of combustion into the annular space between said fire pot wall and the surrounding wall 85, which may be an extension of the lower end ofthe wall of the reservoir 3. The wall 35 has outlets 36 opening through the inner wall of a chamber 37 which at least extends part way around the fire pot. the chamber 37 being preferably annular to completely surround the fire pot. Said chamber 3'? receives the products of COIIllHlSCl-On from the outlets 36 of the fire pot, and an outlet pipe 40 extends from said chamber 37. Air ducts or passages 41 extend vertically through the chamber 37, for the upward flow of air therethrough to be heated by the contact of the products of combustion with said ducts within the chamber, and a horizontal baffle 38 and vertical partition 39 are located within said chamber, for creating the flow of the products of combustion in opposite directions in the chamber past said ducts, whereby to heat said ducts and transmit as much heat from the products of combustion to the air as possible.

In the handling of finer fuels there may be a tendency for such fuel to spill into the air chamber 31. To avoid this difliculty there is mounted on the air chamber 31 an annular apron or overhanging rim 42.

In the adaptation of this apparatus as an air heater, the fuel burning structure is shown as surrounded by a drum 43 of the casing, which is shown as provided with a cold air supplyv duct 44 and warm air take off ducts 45.

The air chamber 31 is air cooled, to prevent excessive heating thereof, and to also assist in heating the air. Thus, the vertical air shaft or member 30 has double walls providing an annular air space 47 between the walls, into which air is supplied by way of the ducts or pipes 46. The wall of the chamber 31 is composed of vertical hollow bars 49,'having the passages 48 therein, and the lower ends of said bars are fitted together on the upper edges of the walls of the shaft or member 30, whereby the air flows from the passage 47 up through the passages 48. The bars are spaced apart to provide the openings or slots 33 through which the air flows outwardly fronrwit-hin the chamber 31. A duct or pipe 50 extends upwardly centrally within the fire pot and reservoir, and has its lower end fitted over the upper ends of the bars 49, to receive the air from the passages 48, and deliver the heated air into the upper portion of the casing 1. The top 32 of the chamber 31 dially extending arm 53 projecting through the opening 8 f the magazine or reservoir adjacent the arm 7. This arm 53 carries a shield 54 similar to the shield 9 for the arm 7. Accordingly, arms '7, 53, protruding through shield of the furnace may be shifted as found desirable for loosening the fuel and working such down into the fire pot 4.

In instances where it is not desired to charge the magazine with fuel at the door 2, such fuel charge may occur at the door 56. The arms 16, 17 for shaking the grates are accessible by opening a door 57. In instances where it may not be desirable to run a central flue 5O upward through the magazine 3 and wherein it is desired to have air circulation through hollow bars of the air chamber 31 there may be provided a cap 58, Fig. 5, over the air chamber 31', and the chamber 62 between the walls 50 of the member 30 may have partitions 59 at opposite sides so that there may be inflow of air by way of duct 46' upward through the space 62 at one side and through the bars 49' into the chamber 61 below the cap 58, thence down. through an opposite series of the bars 49 into the other part of the space 62 and off by way of a duct 63.

Figs. 6 and 7 show means for the provision of varying the capacity of the fire pot, by changing the width of the fuel burning region between the wall of the fire potand the central air chamber. Fig. 6 shows a central air chamber or dome 65 of small diameter having its neck fitted in the upper end of the air shaft or member Sl and said chamber or dome has the air openings 64 in the side wall thereof. This provides for maximum capacity between the air chamber and fire pot wall. As shown in Fig. 7, an air chamber or dome 66 of larger diameter is disposed in the fire pot, having the openings 65' in its wall, thereby restricting or reducing the capacity.

Fig. 8 shows means for reducing the capacity of the fire pot vertically instead of horizontally, as in Fig. 7. Thus, the bot tom grate sections; 10 and 11 are raised and supported by the inner and outer ringsor supports 68 and 69, respectively, which are seated on the respective supporting lugs 67 and 70. This raising of the bottom grate will not only make the fire pot shallower,

but will also reduce the flow of air from the air chamber across the bottom grate. This adjustment of the grate enables the capacity of the fire pot to be regulated, and the burning of the fuel to be changed according to conditions, in adapting the apparatus for different buildings and circumstances. The burning in this furnace is transversely through the fuel with the heated gases unchilled by any passing of it through unburned fuel. That is, at once the gases are abstracted from the fuel, such gases pass from the fuel in a heated region directed to the combustion chamber and the V supply of fuel is uniform at all times, thereby permittin a regular draft to produce a smokeless and complete combustion with advantages of expert stolring without the complications incidental thereto.

Fixed rings 71 may serve to hold the load of fuel off the upper edge of the fuel loosening members 5, 51.

What is claimed and it is desired to secure by United States Letters Patent is 1. A fuel burning apparatus comprising a fire pot, a fuel reservoir above said fire pot, and a ring rotatably fitted within the wall of the reservoir and formed with means for loosening fuel from said wall above the fire pot.

2. A fuel burning apparatus comprising a fire pot, a fuel reservoir above said fire pot, and a ring rotatably fitted within the wall of said reservoir and formed with depending prongs for loosening fuel from said wall above the fire pot.

3. A fuel burning apparatus comprising a the pot, a fuel reservoir above said fire pot, a duct centrally f the fire pot and reservoir, and means movable on the exterior of said duct for loosening fuel therefrom.

4. A. fuel burning apparatus comprising a fire pot, a fuel reservoir above said lire pot, a duct located centrally of said fire pot and reservoir, and a ring movable on said duct having means for loosening fuel from the exterior thereof.

5. A fuel burning apparatus including a reservoir for fuel supply, a firepot, a central duct upwardly extending as to saidfirepot, a ring about the duct having prongs extending toward the firepot, and means for shifting the ring as to the firepot.

6. A fuel burning apparatus embodying a fire pot, an air chamber centrally within said fire pot around which the fuel is burned, and having hollow bars for the uphaving vertical hollow bars, a doublewalled member below said bars for supplying air into said chamber and having a space between the walls thereof communicating with said bars for the flow of air through the bars, said bars being spaced apart for the flow of air from within said chamber between the bars into the fuel, and means for the flow of air through said space and bars. 7

8. A fuel burning apparatus embodying a fire pot, an air chamber centrally of the fire pot around which the fuel is burned and having vertical hollow bars, a doublewalled member below said bars for supplying air into said chamber and having a space between the walls for supplying air to said bars, the lower ends of the bars being fitted on the upper edges of the walls of said member, said bars being spaced apart for the flow of air from within said chamber between the bars into the fuel,'and means fitting the upper ends of said bars for receiving the air therefrom.

9. A fuel burning apparatus embodying. a fire pot, an air chamber centrally of said fire pot around which the fuel is burned, and having spaced hollow vertical bars, a member below said bars for supplying air into said chamber and having double walls with a space between the walls for supplying air to said bars, the lower ends of said bars being fitted on the upper edges of said walls, and meansfitted on the upper ends'of said bars for receiving the air therefrom, said chamber including a top closure at the upper ends of said bars for shutting off communication between the interior of said chamber and means. 7

In witness whereof I afix my signature.

THEOSIS C. SEBRING.

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