US2524068A - Simulated draft pot-type oil burner - Google Patents

Description

Oct. 3, 1950 c. A. MILLER ET AL SIMULATED DRAFT POT-TYPE OIL BURNER Filed May 6, 1947 QMCLILD o q v gow profiop o o m o o oo 0 oo o 000 0000 00 o 0 00000 9 00 6 000000 000 00000000 0 000.00 0000 000 0 00000000000000 INVENTORT CLARENCE A. MILLER. JOHN THOMSON ATTOPNEK Wax Patented Oct. 3, 1950 UNITED STATES PATENT OFFICE- SIMULATED DRAFT POT-TYPE OILQBURNER ClarenceA. Miller and J ohn'Thomson, Pet'aluma, Calif., assignors to Kresky Mfg. 00., -Inc;,. Petaluma, Calif.,-a corporation of California Application May 6, 1947, Serial No. 746,244

(Cl. l'58-9l 4 Claims. 1

This invention relates to oil burners, and especially to improvements in oil burners of'the-stimulated or natural draught pot type of the character disclosed in Kresky Patent No. 1,912,713, dated June 6, 1933, Miller Patent No.'2',391,585-, dated December 25, 1945, and Miller et al., copending application for patent Serial No. 7 33,292, filed March 8, 1947. The assigneeof the present application and the assignee of the copending Serial Number 733,292'are the same.

It is the principal object of the present invention to provide an oil burner of the-stimulated or natural draught pot type wherein-air is introduced to the volatile gases 'for combustion in steps, namely, as primary air, secondary air and auxiliary air. We have'found that air introduced in the primary stage,i. e. adjacent to the surface of the oil to be burned, in a more or less restricted area, followed by introduction of secondary air in a greater area and upwardly in the direction of flameoutlet, increases combustion efficiency, as disclosed in copendingapplication Serial No. 733,292. The addition of air, which will be referred to hereinafter as auxiliary air, from a point adjacent to the top of the burner and from a point laterally of the pathoft-he flame in the direction of'thevertical path of the flame emitted from the'burner-into the furnace unit and tends to project free carbon orcarbon in suspension which has not yet been oxidized into the path of travel of the flame to insure burning thereof in order-to produce a more per feet oxidation of the combustible.

We have foundthat the provision of concavoconvex side walls in an elongated" burner of the char cter generally d sclosed in "said- United States Letters Patent No. 1,912,713,which: is-nro videc with sp ced a ertures for admission of the air, enabl s us to obtain combustion efiiciency of a hi h order.

Other ob ects' and advantages will become anna rent nporxreferr ng'to' the accompanvin soeciflcat on. and drawings; in-whiclrsimilarcharacters of reference represent correspondingparts in the several views.

hollow top castingA, open at thetop, as 8113 3, to form a throat for flame emission. The top casting A is provided with vertically depending end walls 2 and depending opposed concave-com vex side walls 3, which said w'a1ls 2 and 3' are' disposed partially within a bottom casting C.

The top and'bottom castings A and C are disposed within an air box D, which in turn is con nected to a source of air by a pipe E1 or the like. The bottom casting is provided with end shelves 5, upon which rest'the bottoms of end wallsZ' of the top casting-"and with an oil sump 6 disposed centrally of the floor 1, which is inclined slightly downwardly from opposite endstowardthe sumpi A pipe F'is connectedto a suitable source of 'oil supply and leads to the sump 6. The'bottom casting is providedwith vertical end'wall's'fi'and; preferably, arcuate side walls 9 provided with flanges I'l. The'side and end walls of the top casting are: also provided with flanges 1'2 and'the said flanges H and l2'are connected'together 'by'. bolts !3;*or other-suitable means. Referring to Fig. '3, it will'be noted that the side walls s of the top casting are spaced inwardly from the side walls'9'of the'bottom casting to form air distribution chambersG'. The bottom casting C is spaced inward y from the air box D so that air entering through'pipe E'may-have access to theair distributing chambers G for emission therefrom through the spaced iperforations Mprovided in the'walls 3 'ofthe top casting for 'mixing' with the volatile gases in: mixing chamber M.

We prefer to provide a plurality of spaced notches l-5 in-the-bottoms of the walls 3, disposed normally adjacent'to the level of the oil contained inthe saidbottom casting; As hereinbefore mentioned, the floor of the bottom casting slopes slightly from opposite ends toward the sump so that oil, admitted into the sump, spreads radua lytherefrom over the entire floor of said casting in order to-facilitate ignition and quick heating response.

Asrindicated in diagrammatic Fig. 4,-air isintroduced. into the air box and flows therefrom tmdistributingichamber Gfor emission therefrom in the direction of the indicating -arrowsH, J and K to constitute, res ectively, primary, secondary and auxiliarv air. The arrows H, J and K indi- V cate the position of primary, secondary and auxiliarv air flow in a more or less arbitrarv manner as it is obviously impossible to determine precisely where the primary, secondary and auxiliary air flows are defined relative to one another. The auxiliary air K is designated as that air which flows from adjacent to the top of the top casting into the flame, indicated at L, for the purpose of forcing combustible particles, namely, free carbon, back into the path of the flame for complete combustion thereof. The substantially verticaly directed wall of auxiliary air K forces free carbon into the flame L for complete combustion in the furnace unit (not shown) disposed above the throat B of the top c sting. Formerly, free carbon which escaped from the mixin chamber was a waste product.

The walls 3, as hereinbefore mentioned, extend the length of the top c sting A and protrude convexlv toward one another so that at the top of the burner portion, 1. e., adiacent to the apertures which admit auxiliarv air, the said walls are spaced from one another substantially a greater d stance than at the bottom of the burner, i. e., adjacent to the normal level'of oil. The distributin chambers G, formed by the concave sides of wal s 3 and the inner arcuate surfaces of wa s 9 tend. to revent undesirable turbul nce and edd ing of air em tt d therefrom parallel to the surface of oil contained in the bottom casting while air emitted from holes higher in the walls is projected u wardl at a progressively greater angle; the auxiliary air be= in rojected upwardly at the steepest pitch.

While We have described our invention in more or less. specific detail for purposes of clarity of description by way of example and illustration, it is understood that various changes and modifications may be'made within the spirit of the invention and the scope of the appended claims.

We claim:

1.. In an oil burner, the combination comprising an elongated bottom member having side walls, a door portion and. a sump portion; said floor portion inclined downwardly slightly from opposite ends toward said sump portion, means to supply oil to said sump portion, a top member having convexly formed side walls convexly opposed to one another disposed partially within said bottom member, said convex walls being of substantially uniform Convex curvature extending from a vertical portion at the bottom of the walls to a horizontal portion at the tops thereof, and a plurality of rows of spaced apertures provided in said convex side Walls from end to end and top to bottom, said apertures each formed perpendicular to the plane of the wall through which it is provided at the location thereof whereby each succeeding row of apertures from bottom to top of said walls is arranged to introduce air above and across said floor portion at an ever increasing angle relative to the horizontal.

2. In an oil burner, the combination of a bottom member havin side Walls and end walls, a top member having opposed concavo-convex side Walls convexly opposed to one another disposed partially within said bottom member, said concavo-convex walls being each of substantially uniform and equal convex curvature extending from a vertical portion at the bottoms of said walls to. a horizontal portion at the tops thereof, and a plurality of rows of spaced apertures provided in each of said concavo-convex Walls and arranged from top to bottom and end to end thereof, said apertures each formed perpendicular to the plane of the wall through which it is provided at the location thereof whereby each succeeding row of apertures from bottom to top of said walls is arranged to introduce air above and across said bottom member at an ever increasing angle relative to the horizontal.

.3. In an oil burner, the'combination according to claim 2 and wherein the bottoms of said side walls of said bottom member are curved inwardly toward one another and said concavoconvex walls of said top member are spaced in- Wardly from said side Walls of said bottom memher.

4. An oil burner comprisin an elongated mixin chamber open at the top and defined by two convex side walls convexly opposed to one another whereby said side walls are at least twice as far apart at the tops thereof as at the bottoms thereof, each said wall having a substantially uniform convex curvature extending from a vertical portion at the bottoms thereof to a horizontal portion at the tops thereof, and a plurality of rows of spaced apertures provided in said side walls and arranged from top to bottom thereof whereby primary air may be introduced through said perforations adjacent to the bottoms of" said walls and auxiliary air may be emitted from said perforations adjacent to the tops of said Walls, said apertures each formed perpendicular to the plane of the wall through which it is provided at the location thereof whereby each succeeding row of apertures from bottom to top of said walls is arranged to im 7 troduce air into said mixing chamber at an ever increasing angle relative to the horizontal from 1 the bottom toward the top of each said side walls.

CLARENCE A. DEILLER. JOH'N THOMSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,912,713 Kresky June 6, 1933 2,252,162 Breese Aug. 12, 1941 2,391,585 Miller Dec. 25, 1945 2,393,176 Livar et a1. Jan. 15, 1946

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