US2610676A - Sheetsxsheet i - Google Patents

Description

Sept. 16, 1952 c. M. wHx-:ELocK 2,610,676

GAS BURNER WITH SECONDARY AIR FEED Filed Jan. 9, 1947 2 SHEETS-SHEET l Daz-5 ag M 'V1/779920011:

'M il Sept. 16, 1952 c. M. wHEELocK GAS BURNER WITH SECONDARY AIR FEED 2 SHEETS-SHEET 2 Filed Jan. 9, 1947 Patented Sept. 16, 1952 UNITED STATES PATENT OFFICE ,GAS BURNER WIT AIR 9 Claims. l

This invention relates to gas burners and chiefly concerns gas .burners of the type having a continuous discharge port extending about the periphery of the burner head from which gas issues to burn in a flame extending uninterruptedly about the edge portion of the burner.

It is a general object of this invention to yprovide an improved gas 'burner of the character described.

More specifically this invention has as its object the provision of a gas burner of the character described having greatly increased port area as compared with conventional burners ci the continuous port type.

Another object of this invention resides in the provision of a gas burner ci the character described with substantially ring-like ports spaced from one another around the periphery of the burner head from. which gas issues to burn in a iiame hollow at its base.

Still another object of this invention resides in the provision of a gas burner with a series of substantially ring-like ports spaced around the periphery of the burner head and from which gas issues to burn in a'ame hollow at its base wherein means is provided for Ysupplying secondary combustion air to the hollow 'bases of said flames.

A further object :of this inventionresides in' the provision of substantially ring-like ports for a gas burner of the character described connected with one another by narrow slit like ports so as to produce a continuous port arrangement of substantial area extending about the entire periphery of the burner head.

Another object ofrthis invention resides in the provision of a gas burner-of the character described which readily lendsitself to fabrication from stampings for low cost production.

Another object. of this invention resides in the provision of a gas burner of ,thecharacter described having improved means for assuring substantiahy uniform distributionA of fuel 'to.'all of the ported areas of the burnen A In this respect it isV a further object of this invention to assure. uniform distribution of fuelto the peripheral port arrangementvof Vthe lburner by means of aV series of crcuniferentiallyspaced expansion chambers located ,nearl the periphery of the burner head,l and by Supplying fuel to certain of said expansion chambers *froml a central rone of the head while supplying fuel directly to one oi said expansion chambers from a point ad,- jacent to the periphery o'f thefhead'. y

With the above and otherobl'ects in view, which will appear as the descriptionv proceeds,` this in- H SECONDARY FEED vCarlton M. Wheelock, AMilwaukee, Wis.

vApplication January 9, 1947, Serial No. 720.996

`vention .resides in vthe novel construction, combination and arrangement of parts 'substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in vthe precise embodiment of the Vherein disclosed invention may be made as come'within the scope of the claims.

The accompanying drawings yillustrate `several complete examples of the physical embodiment of the invention constructed according to the best modes so far devised for the practical application of they principles thereof, and ingwhich:

Figure 1 is a plan view of the gas burner of this invention with parts thereof broken away and shown in section; f

Figure 2 is a longitudinal sectional view taken through Figure 1 along theplane of the line 2 2;

Figure 3 is an enlarged detail sectional view taken along the line '3-3 of Figure 1;

Figure 4 is aplan view of a modified type of burner;

Figure 5 is a longitudinal sectional view of the burner of Figure 4 taken along the plane of the line 5-5;

Figure 5a is an enlarged detail sectional view taken along theline Suf-5a of Figure 4;

Figure 6 isa cross sectional view through the manifold tube of theburner and taken along the line 6-6 of Figure 5; and

Figure 7 is an enlarged fragmentary sectional view illustrating a still further modified form of the invention.

Referring now more particularly to the accompanying drawings, the numeral 5 generally designates the gas burner of this invention. The burner 5 comprises a substantially flat and nearly circular hollow head Sincluding spaced apart upper and lower disc-like head forming members 1 and 8, respectively, and a rim-like flange 9 extending between the peripheral edge portions of the upper and lower head vforming members but carried by the lower head forming member 8.

The upper and lower head forming members 11 and 8 are connected together in spaced apart relationship by means of upright tubular necks I0 defining cored holes Il extending. vertically through the burner head. In the. present embodiment of the invention the head is 'shown with 'three such tubular necks providing threey cored holes spaced substantially equal distances from one another about .a central zone of the head and lying close to the peripheral rim-like portions l2 of the head. n

The three tubular necks. l0 cooperatev with one4 another to dene in effect ahollow hub-like portion I3 at the central zone of the head and spokelike hollow passages I4 between adjacent necks. It will be noted that the spoke-like passages I4 are substantially restricted but that the same lead to expansion chambers I5 adjacent to the junctures of the spoke-like portions of the upper and lower head forming members with the rim I2 of the head and communicating with the hollow interior of the rim which likewise defines a restricted passageway' extending entirely about the periphery of the head.

The lower head forming member 8 has one of its spoke forming sections depressed outwardly as at I6 from a point adjacent to the innermost wall of one of the tubular necks IIJ rearwardly from said neck beneath the central zone I3 of the head and continued on between the remaining two necks toward the rear periphery of the rim I2.

The depressed portion vI6 actually provides an inward extension of a manifold tube I8 joined to the rim I2 at the rear periphery of the head with the upper portion of the manifold tube connecting with the flange 9 and the lower portion of the tube in line with and forming a part the expansion chamber I5 at the rear of the head so that said chamber receives gas flowing along the upper portions of the tube while the gas ilowing along the lower portions of the tube may pass beneath the expansion chamber and be discharged directly into the central zone of the head at its hollow hub-like portion I3.

From Figure 2 it will be apparent also that the center line of the manifold tube I8 lies substantially in the plane of the lower head forming member 8 and that the upper portion of the tube is spaced slightly beneath the upper head forming member l.

A combustible gaseous mixture flowing through the tube toward the head from the inlet of the tube, as stated previously, initially enters the hollow interior of the head at the expansion chamber I5 alongside the rear periphery of the head to be expanded upwardly and laterally therein to opposite sides of the tube axis into the substantially restricted passage formed by the hollow interior of the rim I2 and leading between the two real-most tubular necks II! and the flange 9.

The gaseous fuel entering the head is also conducted between and past the two rearmost tubular necks I to discharge into the central zone I3 of the head and to impinge the foremost neck I0 whichraligns with the axis of the manifold tube.

The gas delivered to the hollow hub-like central zone of the head is thereafter caused to travel substantially radially outwardly and for- -vardly through the restricted passageways I4 of the hollow spoke-like portions of the head to be delivered to the two expansion chambers I at the front of the head.

The gas expands circumferentially in opposite directions from these expansion chambers into the hollow rim I2 with a portion thereof traveling rearwardly and passing behind the rearmost tubular necks "l0 and other portions traveling forwardly to pass ahead of the forward tubular neck I0.

The result of introducing the gaseous fuel directly into the rear expansion chamber I5 and at the same time to the central zone of the head for distribution through the passages I4 formed by the hollow spokes is to create a substantially uniform gas pressure inside the hollow interior of the rim I2 from which the gas issues to burn in a flame of uniform height at the upper peripheral portion of the head through a peripheral port arrangement generally designated 22.

The peripheral discharge port arrangement is provided by relatively narrow spaces 23 be tween the adjacent marginal edge portions of the flange 9 and the marginal edge portions of the upper head forming member 'I. At circumferentially spaced points the spaces 23 are enlarged to provide a series of holes 24 about the upper periphery of the head with adjacent holes joined to one another through the narrow slit-like apertures 23, and with the holes and the apertures all leading to the hollow interior of the rim.

Secondary combustion air ducts or tubes 25 have their upper discharge ends disposed centrally in the enlarged holes 24 but spaced from the walls of said holes so as to define substantially ring-like discharge ports through which gas in the hollow interior of the rim may issue to burn in a flame hollow at its base. These tubes have their lower ends seated in close fitting holes in the lower head forming member in which they may be press t or otherwise secured and so that their lower ends open through holes 25 to the space beneath the burner head.

Hence, secondary combustion air is free to fiow upwardly through the secondary air tubes 25 to be discharged into the hollow bases of flames burning at the ring-like discharge ports 24.

It is also to be observed that the cored holes I I defined by the tubular necks I0 provide for the passage of secondary combustion air upwardly through the head to its top side so that the flames are fed with secondary combustion air from inside the ring of flame; while secondary combustion air is free to flow up along the outer edge of the burner to provide an external source of air for the ring of flame.

Inasmuch as the narrow slit-like ports 23 are relatively short and the substantially ring-like ports 24 spaced substantially close together about the periphery of the rim, it will be evident that a great increase of port area is obtained over the conventional practice of providing but a single circular narrow discharge port extending continuously about the peripheral portions of the head.

Attention is also directed to the fact that the burner has no ring-like discharge ports at the back thereof adjacent to the junction between the rim I2 and the manifold tube I8 directly over the rear expansion chamber I5. The discharge port at this rear area of the head comprises a relatively long straight slit connecting the ringlike ports 24 lying at opposite sides of the axis of the manifold tube. Y

Inasmuch as substantially uniform gas pressure obtains within the hollow interior of the rim I2, as previously stated, the llame which extends uninterruptedly about the upper peripheral portion of the head will have substantially uniform height at all portions thereof.

In the Figure 1-3 embodiment of the invention described. a cast burner head construction has been illustrated, but the burner design herein concerned also lends itself readily to fabrication from stampings as shown in the Figure 4 7 embodiment of the invention.

The modified burner herein illustrated is subeerdere 5 stantiallyzidentical to that previously ldescribed with the. exception. that the. ring-like. discharge ports 2'4. are not circular but are elongated or of substantially oval shape, although they can be circular ifv desired. p

The burner head is likewise composed of upper and lower head forming members 1' and '.8'. respectively, but these members are made of stampings having complementary neck` portions. I' pressed inwardly therefrom andl telescoping together to form the secondary air holes Il, and to provide for joining the head forming members in spaced apart relationship.

In this embodiment also. the lower head member is provided with a. flange 9 made as a. separate band attached to a short upstanding rim 3.9 on the peripheral edge` portion of the lower head forming member. The. upper free edge of the band 9" likewise cooperates with the peripheral edge portions of the upper head forming ymember 1" to provide the alternate narrow and enlarged apertures as in the previous embodiment.y

The secondary air ducts 2 5', however, are. anchored. to the bottom head forming member 8' by being pressed into holes 3| formed in a horizontal edge portion of the lower head member.

The secondary air tubes 25 are pressed or brazed into these holes and it will be noted that in the Figure 5 embodiment these tubes curve outwardly toward their upper ends so that the ported surface or the head lies at an outward and downward angle.

The. depression I6'V of one of the spokes on the bottom of' the head forming member 8 is extended rearwardly beyond the rear edge of the head and formed to provide the lower half of the manifold tube i8 and to mate with the upper half of the tube which, as shown,v is carried by'and formed as a part of the rim flange 9'.

Near its junction with the head, the manifold' tube I8" is provided with an enlargement'33 dening a shoulder 34 facing the rim of the head. The shoulder 34 acts as a stop to locate a flame arrester 35 located in the inner end portion of the manifold tube into which it is placed before the mating sections are assembled. The flame arrester 3,5' may be of' any desired design and its function is well known to those skilled in the art and further description thereof isl deemed unnecessary.

6 Thus uniform penetration of brazing material into. the joints is` assured, v

In all embodiments of the invention, it is also highly important-from` the standpoint of scavenging the interior of the, burner when the supply of fuel is shut. off that. both the upper and lower head forming members be. concave or saucershaped... as shown, with their hollow sides facing upwardly. Hence. all fuel in the hollow center portion of the head at, the time the fuel supply to. the burner is shut ofi flows, smoothly out wardly and upwardly to, discharge through the peripheral port arrangement Ywith little or no interference, from theI necks, lll. l

VrIhe objectionable popping of the burner at vshut-oil'. timev is. thus eliminated, as the readily escaping fuel continues to` burn smoothly until all gas is exhausted from the head.

From, the foregoing description taken in connection4 with` the accompanying drawings, it will be readily apparent to thosev skilled in the art that this invention provides a highly improved burner construction in which the` port area is greatly increased and whichreadily lends itself to cast construction or to fabrication from stampines..

What I claim as. my invention is:

1. A gas burner.. comprising: a hollow relatively flat burner head having a rim-like periphery; a plurality of apertures in the top wall of the. head adjacent to said rim-like periphery thereof adapted to, provide discharge ports through which gas admitted to the interior .0i the. head issues to burn as al flame;I and hollow secondary air tubes carried by said head` adjacent to said rim-like periphery thereof with their lower ends seated and closely fitting in. holes in the bottom In the modification shown in Figure 7 the lower head forming member is provided with a peripheral portion lying at an outward and downward angle as in the Figurev 2 embodiment so that straight sided secondary air tubes 25" may be pressed in suitable apertures therein to extend at an upwardlyl andoutwardly divergingangle producing a desirable projection of the ame.

One highly important feat-ure of the fabricated burner of Figures 4 to '7 and which renders the Asame commercially successful, resides in the fact that all of the joints J `between the various stampingsfrom which the burner is made are brazed and have'their mouths M lying in parallel planes. This enables use of simple overlapping joints if desired and facilitates disposition of brazing wire into the mouths M of the joints. The brazing of all the joints accomplished simultaneously by disposing the assembled burner in a brazing oven.f with the mouths of all of the mating joints lying in a horizontal condition in which thev brazing materialis preventedfrom flowing lengthwise along the jointsin an objectionable manner, as would inevitably occur with joints lying at an angle to the horizontal.

Wall of the head and their upper ends disposed substantially centrally in Asaid apertures rbut spaced from the sides of said apertures so as to cooperate therewith, in the provision of. substantially ring-like discharge ports for the burner.. said secondary air tubes being adapted to conduct air from' beneath the headl upwardly through its hollow interior for discharge into the hollow bases oi' names burning. at said ringlike ports.; and said top-wall of the head having relatively narrow slits. extending entirely therethrough and joining adjacent apertures so as to provide discharge means extending continuously around the top of the head.

2..y A gas burner comprising: superimposed dise-like stampings; means joining said stampings together in spaced apart relationship; a band extending about the peripheral portions of said superimposed stampings with its upper marginal edge. adjacent to Vbut spaced slightly from the periphery of the. upper disc-like stamping; means joining the` lower edge of said band and the peripheral edge portion -of the lower stamping; cooperating stamped extensions pro jeeting outwardly from the lower stamping and said band providing a manifold tube. by which a gas andl air mixture may be delivered to the space between said superimposed stampings to issue from the space defined between the upper edge of the band and the peripheral edge portionsr of the upper disc-likey stamping; and a joint. between adjacent edge portions of said manifold extensions. j y

3. The structure set forth in claim 2 wherein all of said joints are brazed and have. their mouths accessible at theexterior of the burner and lying in planes parallel to one another to allow disposition of the burner in a brazing oven with the 7 mouths of the joints in horizontal planes to assure uniform penetration oi brazing material into the joints.

4. A gas burner of the character described, comprising: a hollow head including spaced top and bottom head forming members; a substantially upstanding flange on the bottom head forming member extending upwardly and having a substantially scalloped upper edge disposed adjacent to the peripheral edge of the upper head forming member to provide alternate narrow and wide discharge openings about the periphery of the head; and a number of secondary air supply ducts, one for each of said wide discharge openings, seated in close fitting apertures in the lower head member so as to open to the space beneath the head, and each having its upper end centrally located in one of said wide discharge openings but spaced from the walls of said openings to define substantially ring-like discharge ports connected by narrow slit-like ports through which gas in the head issues to burn in a flame.

5. A gas burner, comprising: superimposed disc-like stampings; cooperating means on said stampings for joining the same together in spaced apart relationship and including wall portions extending across said space between the stampings for breaking up said space into a plurality of distributing passages communicating with one another at the center space between the stampings and extending radially outwardly in different directions from said center space, one of said passages providing an inlet through which fuel flows into the burner; a band extending about the peripheral portions of said superimposed stampings; a connection between the lower edge of said band and the peripheral edge of the lower stamping, the upper edge of the band having portions adjacent to but spaced from the peripheral edge of the upper stamping so as to define a discharge port through which gas admitted to the space between said stampings issues to be burned in a flame; and cooperating stamped extensions projecting outwardly from the lower stamping and said band, in line with said inlet passage, to provide a manifold tube through which gas is directly admitted to the ported portion at the outer end of the inlet passage and to the center space between said stampings, the

lower stamping having a depression in line with its extension defining the bottom of said inlet passage and leading inwardly to said center space between the stampings to insure gas entering said center space for outward diversion through the remaining passages, thereby enabling even distribution of such gas to the discharge ports.

6. A gas burner, comprising: a relatively fiat substantially hollow burner head; inner port forming members on the head spaced about the periphery thereof; cooperating outer port forming members on the head substantially embracing said inner port forming members and spaced therefrom to coact therewith in defining a multiplicity of substantially ring-like ports through which gas delivered to the hollow interior of the head issues to burn in a flame hollow at its base; and means on the outer port forming members between adjacent inner port forming members defining relatively narrow slit-like discharge ports extending entirely through the head and connecting said ring-like ports, and through which gas in the head issues to burn in a substantially fiat flame joining the sides of said hollow flames.

'7. A` gas burner of the character described, comprising: a head including an upper head member, a lower head member, and means joining said head members together in spaced apart relationship comprising a plurality of tubular necks extending between said members and spaced from one another to define a number of distributing passages therebetween leading outwardly from a central zone of the head, said necks also providing holes through the head for unrestricted passage of secondary combustion air upwardly through the burner head from beneath the same; a multiplicity of ducts having their lower end portions anchored in the lower head member to open to the space beneath the head and having their upper ends opening through apertures in the upper head member larger than the upper extremities of the ducts to thereby provide substantially ring-like discharge ports for the heads surrounding the upper extremities of the ducts through which gas fed to the interior of the head issues to burn in flames hollow at their bases with said flames supplied with secondary combustion air through the ducts leading to the interior of the flames; and means on said head defining a manifold tube leading to the interior of the head, the inner end portion of said manifold tube extending partly beneath the lower head member and being in direct communication with the space between said head members and with one of said distributing passages to assure gas delivered to the head entering the same substantially simultaneously at said central zone of the head and at the periphery of the head adjacent to the outer end of said designated distributing passage for uniform distribution in all directions toward the discharge ports; and relatively narrow slits extending entirely through said top head member, and connecting adjacent ring-like ports with one another, and from which gas in the head issues to burn in a relatively flat flame.

8. A gas burner of the character described comprising: a manifold tube; a hollow burner head including upper and lower disc-like head forming members joined together in spaced apart relationship, the lower disc-like member being formed with an outwardly depressed portion leading rearwardly to the edge of the head from a central zone of the head; a connection between the manifold tube and the rear edge of the head disposing the manifold tube in alignment with said depressed portion of the lower head forming member so that said depressed portion acts as an inward continuation of the lower portion of the manifold tube whereby a gaseous fuel ilowing through the manifold tube may be delivered substantially simultaneously to said central zone in the interior of the head and to the interior of the head at the rear thereof; a plurality of obstructions in the hollow interior of the head positioned to be impinged by gas entering the head for effecting substantially uniform distribution of the fuel outwardly in different directions from said central zone and toward the edge portions of the head, one of said obstructions being positioned forwardly of said central zone of the head and in line with the manifold tube so as to prevent direct flow of fuel to the front edge of the burner head: cooperating jet forming elements on said head defining substantially circumferentially spaced enlarged apertures opening to the top edge portion of the head joined by relatively narrow slits extending entirely through the top member of the burner head with said slits and apertures being arranged alternately and continuously about the upper edge portion of the head; and secondary air supply ducts seated in close fitting holes in the lower head forming member beneath said enlarged apertures and leading upwardly through the head to have their discharge ends located centrally in said enlarged apertures but spaced from the walls of the apertures so that said walls of the apertures and the exteriors of the ducts at their discharge ends produce substantially narrow discharge ports encircling the discharge ends of said ducts with said ports spaced from one another about the edge of the head and joined with one another by said narrow slits.

9. In a gas burner of the character described: a burner head having a hollow central portion and a hollow rim surrounding said central portion; means defining a substantially radial inlet fuel passage in the head, the inner end of said passage terminating at the central portion of the head and the outer end thereof opening through and communicating with the rim at the rear edge of the head; means on said rim defining a peripheral port arrangement through which a gaseous fuel admitted into the rim issues to burn in a flame; a manifold tube joined to the rim at the rear of the head and in line with said passage to constitute an outward continuation of the latter, whereby the tube conducts fuel directly to the rim at the rear of the head, and also conducts fuel directly to the central portion of the 10 head; and means defining other substantially radial diverting passages in the head communicating with the inner terminus of said rst designated passage with their axes substantially crosswise of the axis of said first designated passage for directing al1 of the fuel brought to said central portion of the head toward circumferentially spaced portions of the rim near the front of the head.

CARLTON M. WHEELOCK.

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

UNITED STATES PATENTS Number Name Date 399,948 Tibbens Mar. 19, 1889 541,212 Pettibone June 18, 1895 663,560l Colver Dec. 11, 1900 839,454 Clunies Dec. 25, 1906 1,014,932 Antonuccio Jan. 16, 1912 1,399,178 Woli Dec. 6, 1921 1,942,397 Cuyler Jan. 9, 1934 2,294,392 Egger Sept. 1, 1942 2,302,505 Rayniak Nov. 17, 1942 2,396,800 Mills Mar. 19, 1946 FOREIGN PATENTS Number Country Date 543,548 Germany Feb. 6, 1932 526,476

Great Britain Sept. 19, 1940

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