US1620353A - Fire pot - Google Patents

Description

J. R. JOHNSON FIRE POT March 8, 1927. 1,620,353

Filed May 22, 1925 awwmtoz 25 W w/w M/WW Patented Mar. 8, 19 27.

i 'UNl'l'El) STATES crack. These injurious effects are accentuated by the alternate cooling and heating following the shutting ofi and turning on of the burner with the action of the thermo static control, usually provided. As the'fire pot is usually sealed in the boiler and is partially covered over with the lining ring,

- these injuries or defects in the pot may not become known until an accident accurs.

Thus in the case of a cracked fire pot, if after a period of rest, the burner should fail to ignitei the oil discharged from the boiler, instea shut-ofi, will simplyleak through the-break in the pot and collect in the fire box, where it may burn or explode when ignition is later attempted.

It is to cure the above dangers and defects that my present invention is directed. This is accomplished in a comparatively simple 'but practical way by providing a jacket about the fire pot and circulating a y coolin fluid therethrough.

In t e present disclosure, water or steam is used as the cooling medium and a further novel feature of the invention consists in utilizing this medium either for the purpose of returningheat to the boiler or for heating the. domestic water supply.

Additional novel features of the invention will appear as the specification proceeds.

In the accompanying drawing, one practical embodiment of the invention is illustrated, but it should be understood that the structure-and modes of use may vary wlthout departure from the spirit and scope of the invention as hereinafter defined and Figure 2 is' a vertical sectional view of Application filed Kay 22,

of collecting in the fire pot and draining back to operate the safety 'of the PATENT o I'IBE POT.

1925. Serial K0. 32,054.

the fire pot in its relation to the burner head.

the fire pot as on substantially the plane of line 3-3 of Figure 2.-

In the particular installation shown, the fire pot, indicated generally at 5, has a front open ng 6' for the reception of the burner head 7 and side openings 8 for the branches 9 of the air duct 10.- As usual in burners of this type, the' air entering the fire pot through the passes 11, mingles with the dischar e from the burner head and burns within the bowl of the pot. The side. walls of this bowl are convergent 0r overhangingas indicated at 12 so as to exert a confining effect, romoting more complete combustion. mbustion is further controlled and promoted by thelining ring 13 of-refractory material which seats within a flange "14 and FFICE.

JO N JOHNSON, OF GREENWICH, CONNECTICUT.

Figure 3 is a horizontal sectional view of has convergent inner walls 15 forming in effect a continuation of the overhanging walls of the bowl.

The mouth 16 of this ring is sufliciently restricted to hold the flame under control and direct it against the 'heat absorbing interior walls of the boiler 17. The bottom pot is shown as inclined to the center at 18 to collect the oil which may not be ignited and drain the sameback through piping 19 to the dri pan 20 which operates to rock the shut-o the latter parts not being shown in detail because usedin present well known installations.

The bowl portion of the fire pot is shown as entirely surrounded by a wall 21, forming a jacket orspace 22 surroundin the pot and providing a chamber for ho ding or circulating a cooling medium. The side portion of this outer wall is shown in Figure 2 as substantially cylindrical and as projecting slightly beyond the lining ring flange, forming with the inwardly. inclined in the upper. part of the cooling jacket.

A maximum cooling' space is thus provided without materially increasing the overall dimensions of theffire pot and without interfering with the connection of the fire pot to the burner head and air flues. In this illustration the cooling jacket stops short of the front, end of the fire pot so as to leave the usual attachment flange 24 free to receive 'the bolts by which the pot is usually mounted.

. An inletand an outlet for the cooling 2 'fluid are provided in the present instance in circulation. If air is used as a circulating medium, suitable piping for the purpose may be connected with such inlet and outlet and may be forced under pressure by a branch taken off from the air conduit 10 for instance.

In Figure 1 there is illustrated the possibility of using the fire pot either as a hot water, heater or as ameans for boosting or returning heat to the boiler. The piping for this purpose comprises a section 27 connected with a water main 28 and having a branch 29 in communication with the lower portion of the boiler with valves at 30 and 31 controlling the water line and boiler connection respectively, for the inlet side; the outlet piping comprising a section 32, 33 leading to a hot water tank 34 and a branch 35 extending back to the'top of the boiler, the hot water feed and boiler return connections respectively being governed by valves 36, 37

In this particular embodiment it will be seen that if the valves 30, 36 are closed and the valves 31, 37 are open, water or steam from the boiler will be passed through the jacket of the fire pot and by a natural flow will be returned back into the boiler. the other hand, if valves 31, 37 are closed and valves 30, 36 are opened, water from the main will be permitted to flow. through the jacket of the fire pot and then on into the tank. In either event the fire pot will be cooled sufiiciently to revent'scaling, cracking or warping of t e same and this flow will have a tendency to maintain the fire pot at a temperature favorable for re-ignition of. the fuel each time the burner is started. after a shut-off period. The jacket about the fire pot is an extra safety feature, providing in case of a defect in the bowl of the pot, 'a receiver for catching any unconsumed fuel.

What is claimed is:

1. The combination with a burner, of a fire pot positioned to receive the discharge of said burner, a cooling jacket surrounding the bowl of such fire pot, a boiler heated from said fire pot, means for circulating fluid from the boiler through the cooling jacket of'the fire pot and back into the boiler, a hot water storage system connected with the cooling jacket and means for selectively cont-rolling connection of the jacket with the boiler and with the hot water storage system. 7

2. A fire pot for oilburners constructed as a unit separate from and independent of the burner structure comprising a flame confining bowl adapted for mounting in the combustion chamber of a furnace as a unit independent of the furnace structure, said bowl being. open in the side thereof to admit the combustion supporting air and the flame of a burner directed into the bowl but being otherwise closed about-the sides and bottom of the bowl and open at the top, a jacket when the burner is on an'd a measure of the heat is retained in the fire pot when the burner is off.

In witness whereof, I have hereunto set my hand this 21st day of May, 1925.

JOHN R. JOHNSON.

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