US2519570A - Pilot for vaporizing burners - Google Patents

Description

Aug. 22, 1950 B. HAYTER 2,519,570

PILOT FOR VAPORIZING BURNERS Filed Sept. 16, 1946 2 Sheets-Sheet 1 7 m Wag] 2e eieeeeeeeeeeee eeeeeeeeeeeeoo A ug. 22, 1950 Ilf3. HAYTER PILOT FOR vAPoRIzING 'BURNERs sheets-sheet v'2 Filed Sept. 16, 1946 Intra inllllllllllfllllll infanta!! ,../f

Inma/@far raec f/ayzfr y reuma Aug. m, 195o UNITED STATES PATENT OFFICE rrLo'r Foa vAromzrNG UaNl-:ns Bruce Hayter, Santa Fe, N. Mex., assignor, by mesne assignments, to Breese Burners, Inc., Santa Fe, N. Mex., a corporation of Delaware Application september 1c, 194s, serial No. 697,265

7 Claims.

The invention relates to an improvement in burners and is particularly applicable to burners in which the'liquid fuel is vaporized and burned.

One p urpose is to provide an improved burner assembly, including a burner pot and a pilot member therein.

Another purpose is to provide an improved type or form of burner pot.

Another purpose is to provide an improved baille` assembly for pot type burners.

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

`The invention is illustrated more or less diagrammatically in' the accompanying drawings. wherein:

Figure 1 is a vertical section;

` Figure 2 is a plan view of the structure shown in Figure 1;

F'isureSisasectiononthelineS-Iofrlgure 1; and

Figure 4 is a section on the line 4-4 of Figure 1.

Like parts are indicated by like symbols throughout the specication and drawings.

Referring to the drawings generally indicates any suitable outer housing, stove member or the like. It is illustrated as having a lower wall 2 having an air admitting aperture 3. The member I is shown as mounted on any suitable legs or supports l, separated by air spaces 5, whereby outside air may pass to and through the aperture 3. The housing I is also shown as having an intermediate ledge or angle member 8 upon which the below described burner pot may be mounted. The space l may serve as a combustion space, into which name and the products of combustion may pass from the pot.v Any suitable flue means, not `herein shown, may beemployed. Mounted within the housing and extending downwardly from and resting upon the ledge or angle 6 is a burner pot generally indicated as 8. It is shown as having a circumferential side wall including generally parallelplane, generally vertical side wall sections il, connected at their ends by arcuate sections Ill. The pot is shown as having an upper and outwardly extending flange which rests upon the ledge or angle 6. i2 is a ame ring having a flame aperture I3. It will be observed that the flame ring conforms generally toV the horizontal section of the pot, and that the `aperture il has parallel straight side edges I4 connected by arcuate edges i5. The pot side wall, including the side and end portions, is provided with a' plurality of circumferentially extending spaced primary air inlets 20. These air 2 inlets are arranged in a plurality of rows. as shown in Figure 1, the apertures of adjacent rows being preferably staggered. The lowest row oi primary air inlets, indicated at 2|, may be downwardly tilted, as shown in Figures 1 and 3. I may provide any suitable means for admitting secondary air. I illustrate, however, a single row of secondary air inlets 22 located adjacent the top of the pot, and preferably upwardly tilted. The secondary air inlets 22 are shown as of larger gauge and more closely spaced than the primary air inlets 20 and 2|.

Any suitable means may be employed for delivering liquid fuel to the interior of the pot for vaporization and combustion. I illustrate for example an inlet duct 25 which receives liquid fuel from a control assembly generally indicated at 26. The assembly may be the conventional float valve assembly and any suitable means such as the knob 21, may be employed for varying the rate of ilow of liquid fuel to the pot. Any suitable means not herein shown may be employed for maintaining a supply of liquid fuel in the valve assembly 23. It will be noted that the liquid fuel inlet 25 extends to one end of the pot. Preferably the space which initially receives the liquid fuel delivered through the duct 25 is separated from the interior of the rest of the pot. I illustrate a pilot piece or housing having a front wall 30 and a cover 3|. kThe cover is shown as at a level above the lowest row of primary air inlets 2|, but below the next lowest row of primary air inlets 20. The pilot piece may be suitably apertured to put its interior into communication with the rest of the pot interior. I illustrate for example a lower aperture 32 and an upper aperture 33, the two apertures being about midway between the ends of the pilot piece. It will be understood that the liquid fuel, when the control is set for a pilot or minimum ow, flows to the pilot space indicated at A in Figure 1. In this pilot space it is subjected to the heat of pilot combustion, and vaporized. The vaporized fuel receives air from the air inlet apertures 2| which are in communication with the interior of the pilot piece. The mixture thus formed ilows through the apertures 32 or 33 or both and is burned at or near said apertures. The nal supply of air is received through the apertures in communication with thelinterior of the pot outside of the pilot piece.

In stabilizing the llame and in maintaining adequate combustion conditions I findl it important to employ heat storage means. I illustrate for example a generally vertical baille 35.

preferably a casting, and of substantially greater thickness than the gauge of the metal of which the pot proper is formed. The baille Il is shown as terminating somewhat above the bottom of the pot, as at l., but as resting upon a central and preferably unitary pedestal Il which contacts the bottom of the pot, as is clearly shown in Figure 3. The bame 35 is shown as terminating somewhat below the horizontal plane of the secondary air inlets 22, as at I8. It also overhangs, as at 39, the top wall Il of the pilot piece.

It will be realized that whereas I have described and shown a practical and operative device, nevertheless many changes may be made in the size, shape, number and disposition of parts without departing from the spirit of my invention. I therefor wish my description and drawings to be taken as in a broad sense illustrative or diagrammatic, rather than as limiting me to my precise showing.

The use and operation of the invention are as follows:

The burner herein shown is particularly advantageous for use in restricted areas of specific'A shape. For example. it fits well into the restricted space available in domestic cooking ranges where a round or cylindrical pot of adequate capacity cannot conveniently be employed. However, a pot which is elongated in cross section develops operational difllculties not found in a cylindrical pot. I find it highly important in operating such pots. to employ the central vertical baille 35, as herein shown. In use, it is advantageous to employ the baille to divide the endwise elongated pot into two relatively thin' spaces. The employment of a vertical pilot of substantial gauge or thickness, with a direct metal to metal contact with the bottom of the pot has proved in practice to be highly eilicient.`

It is important that adequate pilot means be employed, for burning a minimum flow of liquid fuel, at the pilot stage, without the deposit of free carbon or soot. I illustrate the pilot piece formed of the walls 30 and 3i, which ts conveniently into one end of the pot bottom, and which takes air through the pot wall; it will be understood that variation in size and spacing of the air inlets 2| in communication with the pilot space mayl be made.

I claim:

1. Ina pot type burner, a sheet metal burner pot including a bottom wall and a circumferential side wall, said side wall having a plurality of primary air inlets spaced circumferentially thereabout and located at various distances from the top and bottom of the pot and having means for admitting secondary air adjacent the top of the pot, said pot `being of substantially greater length than width, means for controllably delivering a liquid fuel, for vaporization and combustion, to the interior of the pot, including a liquid fuel duct having a discharge outlet adjacent one end of the pot, a flame ring for said pot, partially closing an otherwise open end, said flame ring having an aperture conforming gen' erally to the cross section of the pot, and a generally vertical, generally central baille extending substantially from end to end of the pot, and in heat transfer contact with the bottom of the pot, said baille being of heaviergauge metal than the pot, and being formed and adapted to serve as a heat storage element, one end of said baille being located adjacent the outlet of said liquid fuel duct.

2. In a pot type burner, a sheet metal burner pot including a bottom wall and a circumferential side wall, said side wall having a plurality of primary air inlets spaced circumferentially thereabout and located at various distances from the top and bottom of the pot and having means for admitting secondary air adjacent the top of the pot, said |pot being of substantially greater length than width, means for controllably delivering a liquid fuel, for vaporization and combustion, to the interior of the Dot, including a liquid fuel delivery duct extending to one end of the pot, a name ring for said pot, partially closing an otherwise open end, said flame ring having an aperture conforming generally to the cross section of the pot, a pilot housing in the interior of the pot, defining a pilot space surrounding the point of delivery of liquid fuel through said duct, and a generally central, generally vertical baille extending from end to end of the pot and having an end portion overlying said `pilot housing, said baille being of greater thickness than the side wall of the pot, and being in heat transfer contact with the bottom of the pot.

3. In a pot type burner, a sheet metal burner pot including a bottom wall and a circumferential side wall, said side wall having a plurality of primary air inlets spaced circumferentially thereabout and located at various distances from the top and bottom of the pot and having means for admitting secondary air adjacent the top of the pot, said pot being of substantially greater length than width, means for controllably delivering a liquid fuel, for vaporization and combustion, to the interior of the pot, including a liquid fuel delivery duct extending to one end of the pot, a flame ring for said pot, partially closing an otherwise open end, said flame ring having an aperture conforming generally to the cross section of the pot, a pilot housing in the interior oi the pot, defining a pilot space surrounding the point of delivery of liquid fuel through said duct, and a generally central, generally vertical bafe extending from end to end of the pot and having an end portion overlying said pilot housing, said baille being of greater thickness than the side wall of the pot, and being in heat transfer contact with the bottom of the pot, and a bottom engaging laterally extended pedestal engaging and conforming to the pot bottom.

4. In a pot type burner, a sheet metal burner pot including a bottom wall and a circumferential side wall, said side wall having a plurality of primary air inlets spaced circumferentially thereabout and located at various distances from the top and bottom of the pot and having means for admitting secondary air adjacent the top of the pot, said pot being of substantially greater length than width, means for controllably delivering a liquid fuel, for vaporizing and combustion, to the interior of the pot, including a liquid fuel delivery duct extending to one end of the pot, and a generally upright baille wall extending substantially from end to end of the pot, said wall constituting a mass of metal of substantially greater thickness than the thickness of the sheet metal of which the pot itself is formed, and being of suillcient mass to serve as a heat storage element, said wall extending along the major length of the pot and being substantially equidistant from the opposite portions of said circumferential wall.

5. The structure of claim 4 characterized by and including a base portion, integral with said baille wall, in heat conducting relation with the bottom of the pot, and having substantial lateral extension in relation to the normal thickness of said baifle wall.

6. The structure of claim 4 characterized by and including a pilot chamber located at one end of the pot, said pilot chamber having a front wall and a top wall, the rest of the pilot chamber being formed by the side wall and the bottom wall of the pot, the interior of said chamber being in communication with said liquid fuel delivery duct, said baille being cut away to accommodate said pilot chamber and including a portion overlying the top of said pilot chamber.

7. In a pot type vaporizing burner, a sheet I metal burner pot including a bottom wall and a circumferential side wall, said side wall having a plurality of primary air inlets spaced circumferentially thereabout and located at various distances from the top and bottom of the pot, and having means for admitting secondary air ad- `iacent the top of the pot, said pot being of substantially greater length than width, being generally oval in cross-section, means for controllably delivering a liquid fuel, for vaporizing and combustion, to the interior of the pot, including a liquid fuel delivery duct having a discharge outlet in said pot, a pilot housing having a wall separating a limited space of the pot interior from the rest of the interior of the pot, and being in direct communication with said discharge outlet of the fuel delivery duct, said pilot housing wall defining a flame opening eiective to direct a flame from the pilot housing into the interior of the pot, and a baille wall structure in said pot, exterior to said pilot housing, in heat transfer relation with the pot, and constituting a mass oi metal of substantially greater thickness than Athe thickness of the sheet metal of which the pot itself is formed, and being of sufcient mass to serve as a heat storage element, said baille wall structure being located generally in horizontal alignment with the flame opening in the pilot housing whereby flame issuing from said opening will contact said baille wall structure, said baille wall structure also having portions in heat transfer relation with the bottom wall of the pot.

BRUCE HAYTER.

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

UNITED STATES PATENTS Number AName Date 2,162,844 Jenson June 20, 1939 2,179,142 Breese Nov. 7, 1939 2,187,261 Breese Jan. 16, 1940 2,316,227 Donley Apr. 13, 1943 2,337,673 McCurtain Dec. 28, 1943 2,346,816 Breese Apr. 18, 1944 2,391,585 Miller Dec. 24, 1945 2,393,176 Livar et al. Jan. 15, 1946 2,448,148 Miller et al Aug. 31, 1948 2,460,013 Huston Jan. 25, 1949 2,476,871 Huston July 19, 1949 FOREIGN PATENTS Number Country Date 473,230 Great Britain Oct. 8, 1937 794,972 France Dec. 26, 1936

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