US2435220A - Burner pot and air supply means therefor - Google Patents

Description

M. D. HUSTQN BURNER POT AND AIR SUPPLY MEANS THEREFOR Original Filed June 26, 1942 fl qh Patented Feb. 3, 1948 uma ro'r sun aaroa PATE h/O E I AIR surrey MEANS 1 Milton 1). Huston, Santa Fe, N. Mex.,'assignor, by memo assignments, to Breese Burners, Inc., Santa Fe, N. Mex, a eorporation'ot Delaware Original application June as, 1942, Serial No;

448,589. Divided and this application 15, 1944, Serial No. 518,320

'1 7 Claims. The invention relates to an improvement in burners and particularly to pot type burners.

One purpose is to provide improved flame propagating means whereby quieter operation and flame stabilizationare obtained. n

Another purpose is to provide improved means for delivering secondary air whereby quieter operation is obtained. Another purpose is to provide a structure for directing a supplemental air supply to the area of admission of secondary air in a pot type burner.

The present application is a division of my co-pending application 448,539, filed on June 26, 1942, now Patent No. 2,382,419, August 14, 1945, and is based-on the structure shown in Figure 3 of the earlier application.

Other purposes will appear from time in the course of the specification.

My invention is illustrated more or less diagrammatically in the accompanying drawings wherein: I

Figure 1 is a vertical axial section through a heater embodying my invention;

Figure 2 is a similar vertical section on an enlarged scale, illustrating a part of the -burner,. and

Figure 3 is Figure 2.

Referring to the drawings, 6 generally indicates any suitable outer housing, which may for example be in the form of a cylindrical drum. It may be supported by any suitable means, for example the bottom ring 2, having a plurality of feet 3, which space the structure upwardly from the floor or surface upon which it is supported and permit air to flow therebeneath. t is a bottom partition havin a central aperture 5 for admission of air to the space within the drum i.

6 illustrates a burnerpot having a more or less concave bottom l. 8 is any suitable liquid fuel inlet llne,.the flow of fuelalong which may, be varied or controlled by any suitable means not herein shown and not of itself forming part of the present invention. Illustrated for example is a conventional float chamber 9. It will be understood that, either automatically ormanually, the flow of fuel along the line 8 is controlled, and thereby the combustion within the pot S The pot 6 is provided with an upper flange III, which may rest upon a supporting ring H ex tending inwardly from the wall of the drum i. It will be understood that the space above the ring II and above the top of the pot .6 provides a combustion chamber.

to time apartial section on the line 3-3 of January (Cl. 158-91) A flame ring" may beemployed, the central aperture of which'connects the interior'of the pot 6 with the interior of the combustion chamber. The walls of the pot 6 are providedlwith a v I plurality of primary air inlet apertures l5. :lt will beunderstood that liquid fuel passing out upon the bottom I from the line 8 will-be vaporized by the heat of combustion occurring above the fuel and in or above the pot. The vaporized hydrocarbon rises in the pot and mixes with air flowing in through the'primary air inlet apertures to form'a preliminary or primary mixture. .This primary mixture then receives a supply of-sec-' ondary air through an upper row of secondary air inlets i6, which are herein shown as adjacent the top of the pot. The secondary air inlets are located in a portion of the pot, illustrated at 6A, which is of somewhat increased diameter in relation to the main portion of the pot t. The portions 6 and 6A are connected by an intermediate and generally horizontal pot portion 53. It will be understood, ofcourse, that it need not be strictly horizontal, and in fact may vary widely from the horizontal.

The pot portion BB is provided with a plurality of air admission apertures 20.- These may vary substantially in size and number. If desired I may employ an aperture 29 for each of the secondary apertures it, so arranged that the corresponding pairs of apertures in the rows it and 26 deliver jets which impinge, or the number of apertures 29 may be diiierent than the number of apertures it. In either event either individual Jets. or what is in effect a more or less 'continuous curtain of air, is directed upwardly through the apertures 20 toward the base of the jets directed inwardly through the secondary air apertures it. I find it desirable, although not under all circumstances necessary, to tilt the apertures It, as shown in Figure 2, in such fashion that the secondary air jets are directed upwardly as well as inwardly, referring to the pot when in the vertical position in which it is shown 45 in Figure 1. It will be understood, of course, that the pot may be employed in connection with horizontal burners, in which case its axis will he s horizontal. The result, regardless of the position of the pot, is the delivery, at relatively low 50 velocity. of a supplemental air supply toward the bases or bottoms of the secondary air inlet jets.

I may also employ an exterior expansion chamber herein shown as formed by the angle ring 80, the upper flange of which may engage and be 55 secured to a lower part of the potportion 6A.

- the ring it.

The lower flange SI of the member 30 may make a close nt with the exterior of the pot i. It is shown as provided with a plurality of apertures 32 which are preferably of larger diameter than the corresponding apertures 20.

If desired, the pilot ring I! may be employed, located in a lower portion of the pot and supported for example upon supporting studs or rivets 2i and provided with the secondary passage 22. It will be observed that the ring i8 is located above the lowest of the primary air inlets i5, and provides a small or pilot burner when the rate combustion is reduced, by substantially diminishing the rate of flow of fuel inwardly along the line 8. When the burner is employed at the pilot stage, the flame propagating baille sleeve is not performing any function, as combustion takes place only in the lower portion of the pot. However, at high flre the liquid fuel is supplied at such a rate that all of the primary air inlet apertures ii are necessary to complete the primary mixture, and combustion takes place at or above The Jets of air flowing inwardly from the secondary air inlet apertures 18 provide the necessary secondary air for complete combustion, and the flame rises upwardly through the aperture 14 and into the combustion chamber above the pot 6, and within the lower portion of the drum i.

At the high stage, in pot type burners of the type herein shown, under some circumstances there is a tendency to noisy combustion. The

" flame dances or flashes back and forth to and from the wall oi the pot, along the axis of delivery oi the jets from the inlets I6. I find that I obtain eflicient flame propagation, under all conditions, by adding a small amount of additional secondary air, which preferably is delivered at low velocity upwardly toward the bases of the air jets. The result is quiet operation and a stabilized flame regardless of the velocity of the secondary air.

It will be realized that, whereas a practical and operative device has been described and illustrated, nevertheless many changes may be made in the size, shape, number and disposition of parts without departing from the spirit of the invention. It is therefore wished that the description and drawings be taken as in a broad sense illustrative or diagrammatic, rather than as a limitation to the precise showing.

For example, whereas the secondary air is shown as admitted through a plurality of air inlets !6 located below. the top of the pot; other means may be employed for admitting the secondary air through the wall of the pot or over the top of the pot. It is essential that, whatever means are employed, additional secondary air be delivered at relatively low velocity upwardly along a path or paths intersecting the secondary air jets.

Whereas in Figure 2 I have illustrated the apertures 29 as difi'erent in number than the apertures it, it may be preferable to provide an individual aperture 20 for each aperture ii, the apertures 20 not only being of the same number but exactly below the corresponding apertures 16. In either event a substantial flow of air is directed for intersection with the jets inwardly directed by the apertures i6.

The invention is illustrated as applied to pot type burner in which the axis of the pot is vertical and liquid fuel is delivered to the bottom of the pot. It is equally applicable, however, to pot type burners in which the axis of the 2111111161 is horizontal or at an angle to the ver- It will be realized that whereas I have shown and described an operative device, still many changes may be made in the size, shape, number, arrangement and disposition of parts without departing materially from the spirit of my invention and I therefore wish that my showing be taken as in a sense diagrammatic or illustra- 1tlilve, rather than limiting me to the precise show- The use and operation of the invention are as follows:

In introducing secondary air into a pot type burner certain fundamental conditions have to be met, in order to avoid noisy combustion. In practice noise not infrequently results from the tendency of the secondary jets to dance or vibrate, with the points of combustion moving toward and away from the inner face of the pot wall at speeds which create audible sound. It is important that the secondary air be admitted in such a fashion that the flame jets do not leave the immediate vicinity of the orifice. If the flame jet is to remain in close proximity to the orifice, the rate 0! flame propagation must exceed the velocity of the'let. As control of the rate of flame propagation is not practicable, I flnd it possible to solve the problem by controlling the air jet velocity and also by maintaining an ampie supply of secondary air at the base of the jets. I flnd it preferable but not necessary to employ the tilted holes l6 which, of themselves, to some extent tend to reduce noise. However, in accordance with the present invention, I ilnd it advantageous to deliver an additional secondary air supply closely along the inner face of the pot, to the base of the secondary jets. In the present embodiment of the invention I employ as a specific means for obtaining this result a pot having a pair of generally cylindrical portions, one of which is radially oflset from the other. In the transverse extending connecting portion of the pot EB, I provide a lurality of air inlet apertures which direct jets of air or, it closely spaced, what is practically a curtain of air, along the inner face of the portion of the pot BA oi enlarged diameter. This supply of air impinges against the jets delivered through the secondary air inlets l6 and afiects the speed of movement of the air, and also provides an additional secondary air supply.

I also may find it advantageous to employ what is in efiect a pressure chamber 30, ill between the air inlets 2B and the space between the pot and the outer housing.

However, the pressure chamber is not essential and what is important is that adequate means are employed for directing impinging jets against the jets delivered by the secondary air inlet apertances from the open end of thepot. the pot wall a part of greater diameter having thereln a plurality of secondary air inlet apertures, the wall part of the pot between the two above mentioned cylindrical wall parts having therein a plurality of air inlet apertures adapted to deliver air in general parallelism with the axis of the pot and closely along the inner face of the pot wall part of larger diameter.

2. In a pot type burner, a burner not having an open end and a circumferential side wall, said side wall including two generally cylindrical coaxial portions of different diameter and a connecting portion, the portion of maximum diameter being adjacent the open end of the pot, said portion of maximum diameter having a circumferentially extending row of air inlet apertures, said connecting portion having a row of air inlet apertures positioned to direct air toward the open end of the pot and along the inner face of the pot and toward said first mentioned row of air inlet apertures, and a chamber element extending circumferentially about the pot and enclosing the outside portion of the pot side wall having said last mentioned row of apertures, said chamber element being apertured for communication with the air exterior to said pot, and means for supplying a liquid fuel to the interior of the pot.

3. In a pot'type burner, a burner pot having a closed end, an open end and a circumferential side wall having a plurality of primary air inlet apertures spaced circumferentially thereabout, means for delivering a liquid fuel to the interior of the pot for vaporization, the side wall of the pot adjacent the open end having an outwardly offset wall part and a connecting wall part between said outwardly oflset wall part and the rest of the pot wall, said outwardly offset wall part having a, plurality of circumferentiallyspaced secondary air inlet apertures, and the connecting wall part of the pot having a plurality of additional air inlets adapted to direct air jets toward the open end of the pot along axes intersecting the axes of the jets of said secondary air inlet apertures.

4. In a pot type burner, a burner pot having a closed end, an open end and a circumferential side wall having a plurality of primary air inlet apertures spaced circumferentially thereabout, means for delivering a liquid fuel to the interior of the pot for vaporization, the side wall of the pot adjacent the open end having an outwardly onset wall part and a connecting wall part between said outwardly oifset wall part and the rest of the pot wall, said outwardly ofiset wall part having a plurality of clrcumferentially spaced secondary air inlet apertures, the connecting wall part of the pot having a plurality of additional air inlets adapted to direct air Jets toward the open end of the potalong axes intersecting the axes of the jets of said secondary air inlet apertures, and a centrally apertured flame ring partly closing the open end of the pot.

5. In a pot type burner, a burner pot having a closed end, an open end and a circumferential side wall having a plurality of primary air inlet apertures spaced circumferentially thereabout,

means for delivering a liquid fuel to the interior of the pot for vaporization, the side wall of the pot adjacent the open end having an outwardly offset wall part and a connecting wall part between said outwardly offset wall part and the rest of the pot wall. said outwardly onset wall part having a plurality of circumferentially spaced secondary air inlet apertures, said secondary air inlet apertures being inclined toward the open end of the pot, the connecting wall part of the pot having a plurality of additional air inlets adapted to direct air jets toward the open end of the pot along axes intersecting the axes of the jets from said secondary air inlet apertures.

6. In a pot type burner, a burner pot having a closed end, an open end and a circumferential side wall having a pluralityof primary air inlet apertures spaced circumferentially thereabout, means for delivering a liquid fuel to the interior of the pot for vaporization, the side wall of the pot adjacent the open end having an outwardly offset wall part and a connecting wall part between said outwardly offset wall partand the rest of the pot wall, said outwardly offset wall part having a plurality of circumferentially spaced secondary air inlet apertures, said secondary air inlet apertures being inclined toward the open end of the pot, the connecting wall part of the pot having a plurality of additional air inlets adapted to direct air jets toward the open end of the pot along axes intersecting'the axes of the jets from said secondary air inlet apertures, and a centrally diameter having therein a plurality of primary air inlet apertures circumferentially spaced thereabout and located at various distances from the open end of the pot, the pot wall part of greater diameter having therein a plurality of secondary air inlet apertures, the wall part of the pot between the two above mentioned cylindrical wall parts having therein a plurality of air inlet apertures adapted to deliver air, closely along the inner face of the pot wall part of larger diameter.

MILTON D. HUSTON.

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

UNITED STATES PATENTS Number Name Date 1,987,487 Moore Jan. 8, 1935 2,213,509 Widman Sept. 3, 1940 2,259,743 Fletcher Oct. 21, 1941 2,261,814 Suchland Nov. 4, 1941 2,020,777 Gore et al. Nov. 12, 1935 2,165,212 Bauer July 11, 1939 2,067,783 Nunn, Jr. Jan. 12, 1937 2,214,670 Gilmore, et al. Sept. 10, 1940 1,752,000 Home Mar. 25, 1930 1,940,879 Pickup Dec, 26, 1933 2,038,522 Bock Apr. 28, 1936 2,240,861 Sabins May 6, 1941 2,286,489 Jones June 16, 1942 1,885,674 Beadle Nov. 1, 1932 FOREIGN PA'I'ENTS Number Country Date 5 817,368 France May 24, 1937 274,234 Italy May 30, 1930

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