US1641250A - Oil pilot light - Google Patents

Description

Sept. 6 1927. 1,641,250

J. BREESE, JR

OIL PILOT LIGHT Filed Aug; 1, 1925 I I f4 frz Y G2 James LBr-'eeafe J1.

A TTORNEYS.

Patented Sept. 6, 1927.

UNITED STATES JAMES BREESE, JR.,

OF CHICAGO, ILLINOIS.

OIL PILOT LIGHT.

My invention relates to a burner for liquid or gaseous fuels and a. method of their combustion and particularly to an oil pilot light for use with an oil burning heating apparatus. One object ofniy invention is to provideV pilot'light which shall. burn the pressure. lOther objects will appear from time to time in the course ofthe specificat1on and claims.

I illustrate my invention morek or less diagrammatically in the accompanying drawings wherein L Figure 1 is a side elevation ofthe installation;

.I enlarged scale',

` Figure 3 is a vertical section through the parts shown in Figure 2;

Figure 4. is a plan 'view of the fuel connections; and

Figure fls/ahoiizontal section on an enlarged scale on the line 5--5 of Figure l.

Like parts are designated by like characters throughout the specification and claims.

vA. is any suitable furnace, the details of which form no part of the present invention, havingthe floor A1, the forward wall A2. and an opening A3 therein.

B is any suitable fire pot or combustion chamber, positioned in the furnace, for the combustion of the hydrocarbon or other liquid or gaseous fuel desired to be burned.

i B1 is a. fan driven by any suitable motive means, not herein shown, and connected by means of the air passage B2, through the furnace aperture A3, with the combustion chamber B.

C is any suitable fuel supply tank from the lower portion-of which extends the fuel line C1 which may be controlled by the hand f valve C2. It extends to any suitable floatchamber C3, the vdetails of which form no part of the present invention. Extending fromthe float chamber C3 is the fuel line C. G5 is any suitable metering valve, and

C" is a fuel line of restricted cross section,

pilot fuel line D1.

- plurality of perforations F2.

Application' filed August 1, 1925. Serial No. 47,450.

extending thence to the casing C7 associated with the air passage B2.

D is a T in thel fuel line C4, to receive the D2 is any suitable meter-v ing valve therefor. D3 is a fuel line extending to the pilot burner assembly D* and connected with the line D1 bythe T D5. One arm of the T is closed by the apertured plug DG through which passes the cleaning rod D7,` extending throughout the length of the line D3, and terminating, as at D2, at a point within the pilot burner assembly. D3 is any suitable packing for the rod, lheld in posi-v tion, for example, by the apertured cap D10.

The pilot light assembly generally indi-- cated as D2, includes an interior combustion chamber aperture, F, surrounded b the annular wall F1 which isprovided wlth a F3 is an exterior annular chamber closed bythe circumferential casing wall F4, and connected by the air line F3 with the secondary fan or blower F6 which may be actuated, for ex`-,

ample, by a secondary motor means not here- The top wall F10 of the pilot light chamber ris shown with an upturned annular flange F12 inset in the bottom of the iirepot B. F14 is an aperture in the firepot bottom, herein shown as of smaller cross section than the corresponding aperture F12 of the wall F1".

vI provide in the c losed bottom F of the pilot light chamber a layer G1 of sander other finely -divided material, the top of which is adjacent or above the level of inlet of the fuel-line D3. G2 is a removable closporting roller G3.

It will be realized that whereas I have illustrated apractical and operative device and process, nevertheless many changes might be made in the size, shape, number and disposition of parts and in the steps of my process, without departing from the` spirit of my invention. therefore' wish my description and drawings to be taken as in a broad sense diagrammatic and lllustrative.

The use andl operation of my invention are as follows:

ing plug upon which is mounted the sup- In association with the lire pot of an oil A combustion' chamber.

In the form villustrated herewith I show a combustion chamber surrounded by an annular air chamber, the separating Wall being provided With a plurality of apertures. In the bottom of the combustion chamber I provide a layer of sand or any other material operative orthe lsame function, and introduce the liquid fuel, preferably at approximately the level ofthe bed of sand. The air necessary to support combustion is pumped by the fan F through the line F5, the chamber F3 and the passages F, to the combustion chamber. The liquid fuel is dispersed in the sand and coats the various particles with a thin liquid layer. This action damps out any lag or irregularity oi flow due to the pumping of the fuel in small bodies orrdrops.

The fuel may be initially ignited, for example by a gas torch. When combustion is in progresshthe vaporized fuel which lills the combustion chamber receives the air necessary for combustion through the apertures F2. The streams of air so admitted mix with the vapor to form a combustible mixture, the combustion having the appearance of a plurality of tubular jets of iiame converging in the center of the chamber, mingling and rising as a single flamethrough the apertures F 1*, F12. i

The fuel flow and air pressure are so regulated that the ame pressure at the upper neck of the pilot light chamber is greater than the static pressure of the fire pot when the fan or blower B1 is in operation', thus preventing back pressure in the pilot light chamber.

During combustion carbon will coat the Walls of the chamber. The blasts of air from the apertures maintain open passages in the carbon lining so formed, the passages increasing in cross section toward the center of the chamber. This lining builds out until the carbon reaches a point Where the iiame burns it oli'. l/Vhen a balance is reached between the tendency of the carbon to deposit, and the tendency to burn oii, I have a lining of incandescent carbon. When this balance is reached, the temperature ofthe chamber is approximately 1800o F. and will not rise higher. At this temperature some of the carbon dioxide breaks down to @O4-O2, and the result is a flame rich in carbon monoxide and in oxygen. This flame can play l indefinitely against the lining ofthe iirepot urning (Sti` chamber ,being positioned beneath the bottom of the main irepot, the irepotvbeing apertured inline with the central opening or' the pilot light mixing chamber, the diameter of said aperture being substantially less than the maximum diameter of said mixing chamber.

2. The combination with an oil burner having a firepot and meansfor supplying air thereto under pressure, of an oil burning pilot light associated with said iirepot,

said pilot light 'including a mixing chamber,

means for supplying a liquid hydrocarbon thereto, means for supplying air under presl sure to said mixing chamber, the mixing chamber being positioned beneath the bottom of the main irepot, the lirepot being apertured in line With the central opening of the pilot light mixing chamber, the diameter of said aperture being'substantially less than the maximum diameter of said mixing cham-ber, there being independent air supply inpilnbersj'gtegding to the iirepot and to the mixing chamber ofthe pilot light, and an independent l'uel line extendl mg to the lower portion of the mixing cham y ber of the pilot light.

3. The combination with an oil burner having a firepot and means for supplying air thereto under pressure, of an oil burning pilot light associated with said iirepot, said means for supplyinga liquid hydrocarbon thereto, means for supplying air under pressure to said-mixing chamber, the mixing chamber being positionedbeneath the bottom oit the main irepot, a communicating aperture being provided, the diameter-ot said aperture being substantially less than Vpilot light including a mixing chamber,

the maximum diameter of said mixing chamber. I

Signed at Chicago, county of Cool; and

' State of Illinois, this 29th day of July, 1925.

JAMES L. REES, JR.

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