US 1754603 A
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April 15, 1930. c. J. BROWN v FURNACE GAS BURNER Filed May 28, 1928 2 Sheets-Sheet l inve@ for.' 651/454 ze JI' Eem/WV,
April 15, 1930. J, BROWN Y 1,754,603
FURNACE GAS BURNER Filed May 28, 1928 2 Sl'1eets-Shee1'. 2
Patented Api. 15, 1930 4uls'u'rlazo s'ra'ras 4Lite-1,603
CHARLES J. BnowN, or noNoRA, rnNNsYLvANm FUBNACE das BURNER Application `ilcd May 28, 1928. Serial No. 281,217.
, This invention relates to burners and, while not limited thereto, relates moreparticularly to gaseous fuel burners for use with annealino' furnaces and the like, and has for its object the provision of a novel burner con-v struction and mounting which will prevent entirel the direct impingement ofthe flame from t e burner upon the object to be heated.
Another object is to provide a burner which will direct the flame backward` against the refractory surface ofthe furnace wall in which the burner is mounted, so as to heat thewall to incandescence, and thereby indirectly transmit the heat to the article or articles to be heated by radiation rather 'than by conduction or convection.
A furtherobject is to provide a burner having the novel combination, construction and esignof vparts hereinafter described 20 and illustrated 1n the, accompanying drawins.
l the drawings- Y .y f
Figure 1 is a transverse sectional view through an annealing furnace having the 215 novel burners of thls invention mounted therein.
Figure 2 is an enlarged sectional detail through a portion ofthe furnace wall and burner. i
Figure 3 is an enlarged sectional view of the head en d of one of the burners.
Fi ures 4 and 5 are views taken on the line V-IV and-V-V of Figure 2, respectively. y
Referring more articularly to the drawings, the letter A esignates the furnace as a whole which is composed of bottom, side,
end and to walls of usual construction, ex.
cept that t ey are provided with a series of openings 2 in which sleeves 3 are mounted to receive burners B.
The furnace walls at the inner end of each of the openings 2 'are provided with concave recesses 5 adapted to receive the flame from the burners B. y The burners B are each composed of an outer air and gas mixing tube 6 spaced centrally within the sleeve 3 vand provided intermediate its ends with a T-fitting 7 The 5 tube 6 has its forward or furnace end open,
proximately 30 degrees to the face of the furwhile its rear end is partially closed by a cap 8 having a centrally arranged opening intc which a gas supply nozzle 9 is threaded. The cap 8 is provided with air inlet openings 10 through which primary' air is drawn to be mixed with the gas from the nozzle 9. The nozzle 9 is connected to a gas supply conduit 12 which leads from a gas main 13.
A secondary air conduit 14 for air under pressure enters into the mixing tube 6 through the T-ftting 7 and extends centrally through the tube 6 to the forward or furnace end thereof. rlhe conduit 14 is connected to an air pressure main 15. y
A mushroom-shaped head 'member cornprising a hollow stem. 16 and an outwardly Haring body portion 17, is threaded onto the forward or furnace end of the secondary air conduit 1li. The body portion 17 `extends transversely materiallybeyond the gas and air mixing tube 6.
The forward or furnace side of the body v portion 17 of the head is provided with-a secondary air groove 18, and suitable openings 1 9 are provided from the groove 18 into the hollow stem portion 16 of the head through which the secondary air passes to the groove.
A deiector plate 20 is secured to and is coextensive with the forward end of the head land is spaced from the edge thereof so as to 80 provide anair discharge slot. VThe rear edge of the plate 20 is provided with a rearwardly projecting and inwardly beveled flange 21 ada ted to cooperate with the peripheral edge of tf e body of said head to form a restricted discharge slot for the secondary air.
The curvature of the outwardly Haring body 17 of the burner head is such that the gas and air mixture fiowing from the mixing tube 6 will be defiected approximately 90 degrees to the axis of the burner or substantially parallel to the face of the wall, while the ref stricted .outlet slot for the secondary air formed by the edge of the body 17 of the burner head and the ange 21 on the plate 20, will deflect the secondary air rearwardly at an angle of approximately `60 degrees to the axis of the burner and at an angle of apnace wall.
v tube 0 `air through the openlngs 10 1n the ca In o eration, the gas entering the mixing m the nozzle 9 will aspirate primary 8, which air will mix with the gas as it ows throu h the tube 6. As the as and air mixture flgows out of the forwar end of the tube 6 it will be ignited and, due to the novel shape of the mushroom burner head, the gas and air mixture will be deflected outwardly at an angle of substantially 90 degrees or arallel with the face of the furnace wall.
he secondary air, which is under pressure, will flow from the conduit 14 into the groove 18 and will be deflected back toward the furnace wall at an angle of approximately 30 degrees to the face of the wall, so as to blow the air and gas mixture back into the concave recess 5 in the wall which serves to spread the flame. The secondary air furnishes the air necessary to complete combustion of the gas.
Due to the fact that the burning gas and air mixture is forced rearwardly and spread over the furnace wall so as to heat the wall itself to incandescence, the wall will then transmit the heat to the annealing box or other charge to be heated by radiation rather than by conduction or convection.
While I have shown and described one specific embodiment of my invention, it will be understood that I do not wish to be limited thereto since various modifications may be made without departing from the scope thereof, as defined in the appended claim.
I claim- The combination with a furnace wall having a concave recess therein and an opening through said wall centrally of said recess and a sleeve mounted in said wall, of a burner mounted in said sleeve and spaced from the side walls thereof, said burner comprising a. gas and air mixing tube open at each end, a gas supply tube projecting into the rear end of said tube and adapted to produce an aspirating effect to draw primary air through the open rear end of the mixing tube, a secondary air tube leading from a source of air under pressure and mounted centrally within said mixing tube and lterminating adjacent the forward end thereof, a mushroom-like head mounted on the forward end of said secondary air tube and spaced from the forward end and side wall of said mixing tube so as to provide a passageway for the mixture of air and gas from said mixing tube, said head having its rear face curved so as to deflect the air and gas mixture on a line extending approximately degrees to the burner axis, and said head having its forward face grooved to form an air passage, a plurality of openings from said groove to the interior of said head through which the secondary air under pressure is adapted to pass, and a baffle plate secured to the forward end of said head and extending beyond said groove, said plate m hand.
y CHARLES J. BROWN.