US2094764A - Grille ring for liquid fuel burners - Google Patents

Description

Oct. 5, 1937. J. A. WILSON GRILLE RING FOR LIQUID FUELVBURNERS Filed Ju1y`f27. 1935 Patented Oct. 5, 1937 l UNITED STATES GRILLE RING FOR. LIQUID FUEL BURNERS John'A. Wilson, Detroit, Mich., assgnor, by mesne assignments to The Timken-Detroit Axle Company, a corporation of Ohio Application July 27, 1933, Serial N0. 682,374

16` Claims.

This invention relates to liquid fuel burners of the rotary wall ame type wherein ignition and combustion take place around a hearth ring which is provided with a grille ring that serves to increase the rapidity of the combustion and to hold the fiame down on said hearth ring. The invention has for its principal objects to provide a strong, durable and light-weight grille ring of simple and economical construction; to

increase the efficiency of said grille ring and t'o prolong the life thereof; to enable the grille ring to be quickly and easily mounted on and dismounted from the hearth ring, and to provide a grille ring which is quick to heat and cool.

The invention consists principally in providing the burner ring of such burner with a metal grille ring; and it also consists in the parts and in the construction, combination and arrangement of parts hereinafter described and claimed. Inthe accompanying drawing, which forms part of this specification and wherein like symbols refer to like parts Wherever they occur.

Fig. 1 is a horizontal cross-section through the combustion chamber of a furnace equipped with a rotary fuel burner having a burner ring providedy with a metal grille embodying my invention,

Fig. 2 is an enlargedfragmentary plan view of the burner ring and metal grille construction, FigliV is a vertical section'on the line 3 3 in Fig. 2; and

Fig. 4 is a perspective view of one of the sections of the metal grille ring. c

Referring to the accompanying drawing, my invention is shown in connection with a furnace equipped with an oil burner `of the rotary wall flame type. `Said burner comprises a rotary distributor head A locatedv at the center of the combustion chamber B of the, furnace, a metal 40 hearth plate C and a metal burner ring orAV ignition and combustion ring D disposed arondithe periphery of said hearth plate adjacent to the wall of said combustion chamber. Any suitable ignition means may be used', the means iilus'- trated comprising electric spark ignition devices E mounted in the burner ring D. The 'metal burner ring D, which is seated in suitable brack` ets or chairs I mounted on .the hearth' plate C, preferably comprises a trough orgutter 2, an upwardly extending impact wall 3 disposed at the outer edge of said gutter, and a flange. il extending inwardly and dcwnwardly'from the inner edge of said gutter to the hearth plate C.

In operation, the -oil spray is thrown outwardly from the rotary distributor head A and strikes the -impact wall 3 above the gutter 2, ignition l and combustion initially taking place in said gutter and the ame gradually lifting to the top of the burner ring when normal combustion conditions are reached. v ,5 Mounted on the burner ring D is a grille ring F, which operates to increase the rate of mixing and to hold the flame down on said burner ring. Said lgrille ring is preferably made of sheet metal of high heat conductivity, such as 10 high resistant chrome steel of comparatively thin section. The metal grille ring F slopes downwardly and outwardly with its main body portion disposed outwardly ofA said wall and with its inner marginal portion overhanging and spaced 15 above the upper edge of said wall. In order to obtain a maximum mixing effect over the entire -area of the grille, said grille is disposed substantially at right angles tothe direction of the air iiow. The metal grille ring preferably comprises 20 sheet metal segments F that are arranged end fto end to form a substantially continuous ring.

Each segment comprises upstanding'inner and outer flanges 5 that are connected by( a plurality ofbridges 6 that are spaced apart to form rec- 25 dene the openings l. As there are three openings 'rl and four cross bridges 6, the total area of the openings is relatively large, being about thirty-seven per cent of the entirearea of the 35 bottom of the grille and therefore almost as great as the area of the cross bridges.

Each' segment F is removably mounted on the y upstanding impact wall t ofthe burner ring D by means of mounting strips 9 that are secured 40 to the underside of the endmost bridges t of said segment, as by welding. The inner end portion lil of each mounting strip is bent downwardly and terminates at its lower end in split nger portions il that straddle the upper edge of the impact wall 3. The other or outer endr portion I2 of each mounting strip is inclined inwardly and downwardly and abuts at its lower end against the outer face of the impact wall 3 50 of the burner ring, thus preventing tilting of the grille 'ring onthe burner ring. The angular pos'ition of the grille ring may be changed to obtain a maximum efficiency of combustion in a particular installation or for a given set of con 55 grille.

ditions by bending the end portions of the mounting strips.

'Ihe hereinbefore described metal grille ring has numerous advantages. The grille ring segments may be quickly and easily mounted on the burner ring in proper position. Being made of metal, the grille ring segments are strong and durable-and of light weight, can be held within very close tolerance limits as to all dimensions and can be quickly produced. Making the segments of metal also eliminates loss due to breakage and enables the segments to stand extreme temperatures and sudden temperature changes Without danger of breakage. 'Ihe present grille ring is rapid in its cooling and heating which are essential for the'satisfactory operationi of the burner. The grille openings being disposed crosswise of the burner ring, each opening receives substantially the same amount of the combustible mixture, therieby securing av uniform distribution of the mixture around the The flanges along t'he bridges cooperate therewith to form protected troughs facing in the direction of vapor and air flow, whereby the flame is retained in said troughs regardless of the velocity of gas flow through the openings.

Obviously, numerous changes may be made Without departing from the invention. Therefore, I do not wish to be limitedto the precise construction shown. For instance, while the grille ring is shown in connection with a metal burner ring, it may also be used in connection with burner rings of refractory material,

What I claim is:

, 1. A liquid fuel burner of the Wall flame type comprising a combustion chamber closed by a hearth, means for supplying and discharging liquid fuel over' the hearth, a burner ring mounted above the hearth in the path of the discharged fuel, a metal grille ring, and adjustable mounting means on 'said metal grille ring cooperating with said burner ring for making changes in the position of said metal grille ring on said burner ring.

2. A liquid fuel burner of the wall ame type comprising a combustion chamber closed by a hearth, means for discharging liquid fuel over said hearth, a burner ring mounted above the hearth in the path of the discharged fuel, a

metal grille ring mounted on said burner ring, and means on said metal grille ring cooperating with said burner ring for properly positioning said metal grille ring on said burner ring, said means comprising portions depending from said grille ring and adapted to engage the top and side respectively of said burner ring.

3. A liquid fuel burner of the wall flame type comprising a combustion chamber closed by a hearth, means for discharging liquid fuel over the hearth, a burner ring mounted above the hearth in the path of the discharged fuel, and a metal grille ring mounted on said burner ring, said grille ring comprising a main body portion located above said burner ring, said body portion being provided with a plurality of transversely extending openings separated by transversely extending troughs. f

4. A liquid fuel burner of the Wall flame type comprising a combustion chamber closed bya hearth, means/ for discharging liquid fuel over the hearth, al burner ring mounted above the hearth in the path of the discharged fuel, and a metal grille ring mounted on said burner ring, said metal grille ring comprising side flanges, a plurality of spaced cross-bridges connecting said.

side flanges, and flanges along the edges of said bridges.

5. A liquid fuel burner of thewall flame type comprising a combustion chamber closed by a hearth, means for discharging liquid fuel over said hearth, a burner ring mounted above the hearth in the path of the discharged fuel, and a metal grille ring mounted on said burner ring, said metal grille ring comprising side flanges, a plurality of spaced cross-bridges connecting said side flanges, and mounting straps depending from some of said bridges, said straps each having one portion shaped to cooperate with the upper edge of said burner ring and another portion shaped to abut against the outer face of said burner ring.

`6. A liquid fuel burner of the wall flame type comprising a combustion chamber closed by l hearth, means for discharging the liquid fuel in a substantially horizontal path over said hearth, a metal burner ring mounted above the hearth in the path of the discharged fuel, and having a gutter provided at its outer edge with an upstanding impact wall, and a metal grille ring mounted on said impact wall at an acute angle to the outer face of said impact wall.

7. A liquid fuel burner of the wall flame type comprising a combustion chamber closed by a hearth, means for discharging liquid fuel in a substantially horizontal path above said hearth, a metal burner ring mounted abovethe hearth in the path of the discharged fuel and having a gutter provided at its outer edge with an upstanding impact wall, and a metal grille ring mounted on said impact wall, said grille ring being provided with a plurality of elongated openings that extend crosswise of said grille ring above the upper edge of said impact Wall.

8. In a liquid fuel burning apparatus, in combination with a combustion chamber having a hearth and an upright wall, fuel distributing means for projecting a fuel'strcam toward said wall, a member providing a thin refractory Wall spaced materially from said upright wall in the direction of said fuel distributing means and spaced substantially above said hearth, thereby to form a relatively large chamber between said member and the upright wall, means for causing air to ilow upwardly into intersection with the fuel stream adjacent the top of said thin wall,

and a flame-controlling grille work mounted' above said thin wall and overhanging said large chamber.

9. In a liquid fuel burning apparatus of the type comprising means for projecting fuel and air substantially horizontally in substantially individual streams toward a surface to be heated, a structure having a fuel impact wall and an air deilecting surface arranged below said Wallin the path of the air stream and of suicient height to change the course of the oncoming stream of air and direct it upwardly toward said impact Wall, and a metal flame-controlling apertured member of high heat conductivity and resistance mounted in proximity to said impact wall, said llamecontrolling member having a surface adjacent said impact wall and disposed substantially at right angles to the flow of air passing said air deflecting surface.

A of the latter. I

-11. In a liquid fuel burning apparatus of the type comprising means for projecting fuel and air in substantially individual streams toward a surface to be heated, a refractory member including a thin metal fuel impact wall spaced materially inward'from said surface and spaced substantially above the hearth, thereby to form a relatively large chamber between said surface and the entire impact wall, and a metal flame-spreading member mounted above said impact wall in overhanging relation to said chamber.

12. In 'a liquid fuel burning apparatus ofthe type in whicha combustible mixture of liquid fuel and air is passed through a portion of the combustion chamber to reach acombustion region at relatively high velocity, a flame-controlling member disposed at said combustion region in the path of said mixture, said member having two substantially parallel sides of appreciable area, one of which faces in the direction of the oncoming combustible mixture and the other of which faces oppositely thereto, said member having a set of upwardly opening pockets facing in the opposite direction.

13. In a liquid fuel burning apparatus of the type in which a combustible mixture of liquid fuel and air is passed through a portion of the combustion chamber to reach a combustion region at relatively high velocity, a flame-controlling member disposed at said combustion region in the path of said mixture, said member comprising means forming an elongated trough, the side Wall of said trough being arranged in the general direction of travel of said mixture through said combustion region and adapted to have the gases of combustion -travel in contact therewith.

14. In a liquid fuel burning apparatus of the type in which a combustible mixture of liquid fuel and air is passed through a portion of* the combustion chamber to reach a combustion region at relatively high velocity, a metal flame-4 controlling member disposed at said combustion region in the path of said mixture, said member having passages therethrough in the general 'direction .of travel of said mixture through said combustion region, the total cross sectional area of said passages being almost as great as the closed area of that surface of the member which faces the oncoming combustible mixture.

15. .In a liquid fuel burning apparatus of the type in which a combustible mixture of liquid fuel and air is passedthrough a portion of the combustion chamber to reach a combustion region at relatively high velocity, a fuel and air mixing wall disposed at said combustion region in the path of said 4combustible mixture, a flame-controlling member, and mounting means supporting said member above said Wall and having an anchoring element provided with a notch for reception of the upper edge of said wall.

16.- rn combination with the hearth of an oilburning apparatus having means for projecting the fuel across thehearth, a metal structure supv ported on said hearth and having a thin upright wall in the path of fuel projection, a name-controlling member formed of thin metal having low resistance to heat transfer and high resistance to destruction or deformation, and metal mounting means between said structure and said :damecontrolling member to support the latter above said thin Wall of the former.

JOHN A. WILSON.

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