US2400397A

US2400397A - Gas burner assembly

Info

Publication number: US2400397A
Application number: US482539A
Authority: US
Inventors: Clarence L Dewey
Original assignee: Bendix Aviation Corp
Current assignee: Bendix Aviation Corp
Priority date: 1943-04-10
Filing date: 1943-04-10
Publication date: 1946-05-14
Anticipated expiration: 1963-05-14

Description

I May1 4,:194 6. Y I c. L. DEWEY I I v eAs BURNER ASSEMBLY Filed April 10, 1945 2 Sheets-Sheet 1 May 14, 1946. c. L. DEWEY 2,400,391

' eAs' BURNER ASSEMBLY Filed April 10, 1945 2 Sheets-Sheet 2 A Ji 6W. ea g, 7

light to the individual burners.

Patented May 14 1946 GAS BURNER ASSEMBLY v Clarence Dewey, Elkhart I nd.,'. assignor to Bendix Aviation Corporation, South Bend, Ind.,

a corporation. of Delaware Application April 10, 1943, v Serial No.- 432,53

scl i s, (01.158-104) I v This invention is directed to a gas burner-assembly comprising a plurality of individual gas- I burners carried by a frame or support] which makes provision for the mounting of the individual burner and the gas-air-ducts leading thereto as well as the centrally disposed pilot light and-the flash tubes which 'radiate from the pilot The object of the present inventior is to simplify the general structure by forming the parts thereof mainly from metal stampings, preferably of sheet aluminum, together with gas-air ducts configured from lengths of metal tubing to provide' Venturi tubes'adapted to aiford aproper mixture of gas and air for admission to the burn ers. The bumerheads are'preferably formed by a die ,casting operation, and the parts thus' constructed are capable of being assembled and united without the provision of extraneous fastenings which greatly simplifies the operations involved in the making and assembling of the parts into aunifled structure adapted formount I ing as aunit on a gas stove or the like. s w I Further objects and details will appear from a description of the invention in conjunction wit theaccompanying drawings wherein: 1 J

Figure 1 is atop plan view of the entire assembly; I

Fig. 2 is a sectional view taken on'the ofi setline 2-2 in Fig. 1 looking in the'direction of the ar-- rows;

Fig; 3 is a and Fig. 4 is a plan view of one of the metal blanks which are bent to tubular formation in the construction of the flash tubes.- a The structure as a whole, in thelform shown which provides anassembly or four burners, is mounted upon and carried by'a rectangular'body plate a l0 which is provided near-its forward ed I I with a pair of upwardly arched ridges I2 which front view of the bumer assembly? the edgeof theebody plate near the rear corner thereof so that the side portions ll of the body plate will stand in slightly depressed relation to "the center portion of the plate.

f lye'xtending outer and inner spaced ribs an'd,

This formation provides a channel socket for each of the rearwardly extending gas-air ducts I3 which diverge throughout their rear portions IE to follow. thev contour of the body plate-so that when assembled the body plate will fit snu y over the top of each of the rearwardly extending centrally disposed gas-air ducts to afford a channel ,socket therefor which permits the parts to be permanently united by spot-welding. at the I points l9.

In order'to reenforce the front portion of the body plate, the same is provided with transverse- 2|, which connect the ridges i2 on the inside and comb ne with ribs. 22 and 23 united with th outside of the ridges, to aiford a still and firm re- H enforcement for the forward portion of the body plate.

At a point beyond the longitudinal center of I the plate, but in the transverse center thereof,

theplate is provided'with four spaced upwardly bulging bosses 2 which afford four intervening grooves 25' for the reception of the inner ends of four radiating "flash tubes 26 extending diagonally toward the respective rear burners l4 and toward forward burners 21 standing in adjacent relationto the front corners of the body plate.

The flash tubes are formed from stamped sheet metal blanks 28 (Fig. 4) of generally rectangular formationwhich at one end are concavely out along their edges on each side at thev points 29 which unite in an edge-tapered tip 30.

bridge and fit snugly: against the intermediate body portion of a pair of gas-air duct l3 which 1 underlie the body plate and extend rearwardly to and make connection with a pair'of rear bumers H which stand beyond andin'dia'gonal rela tion to the rear corners of the bodyvplate.

The ridges l2 extend inwardly in'parallel relation to a point below the middle of the body plate at which point the" ridge formation onthe inner side terminates ini'the flat surface of the central portion of the body plate which is upwardly stepped at l5,'but on the outside theridge formation continues in each instance as an oblique downwardly stepped offset I6 which terminates in with a port 3| and at its opposite end with a.v

The blank near itsforward end is provided tongue 32, The blank in the form above described is bent to the tubular formation of the i flash tube 28 with itsedges in abutment alonga centerseam 33 and with the concavelycut edmsgn uniting to' form an obliquely upwardly opening discharge aperture which merges into i an underlying lip 35 at tlietip end. a

Each of the flash tubes is similarly formed, and

when their inner ends are socketed within the grooves 25, the respective tongues 32 will be thrust downwardlythrough apertures 36 and offset as in Fig. 2to hook under the bosses, thereby 1 holding the inner ends of the tubes firmly in position and in proximity to a pilot flame emitted from a centrallydisposed pilot tube 31 which projects upwardly through a depending cup 38 suspended from the body plate in centrally disposed relation to the bosses 24.

The burners I4 and 21 are of preferably identical construction so that a description of one will sufiice for all. Each of the burners is formed in two parts and comprises an upper exterior casing 39 of cylindrical formation and of sheet metal, preferably aluminum, press formed, to the proper configuration to provide a lower flat marginal flange 40 of square outline and a spunformed upper flared circular throat flange 41.

In order to make provision for the socketing of the inner end of a gas-air tube, the upper burner section on its forward side is outwardly extended to provide a half-collar 42. The upper outer burner section combines with alower inner section 43 of sheet metal die-formed to provide an upwardly extending inner air duct 44 which at its lower end is outwardly extended to afford the base 45 of an annular channel 46, the base merging into a cylindrical outer wall 41, terminating in a flat marginal flange 48, square in outline, which registers with the flange 40 of the upper section.

Spot-welding points 49 and 50 serve to unite the two

flanges

40 and 48 to one another and to unite the burner as a whole to the surface of the body plate, in the case of the forward burners 21 although the rear burners 14 are supported solely by the respective gas-air tubes to which they. are

attached.

In the case of each of the burners, however, the wall 41 of the lower section is interrupted on the forward side to provide a half-collar which registers with the companion half-collar 42 to afford a circular socket for the reception of the inner end of the gas-air tubewhich is secured to thesocket thus provided, by spot-welding points 52.

In the case of the forward burners 21, the

eter, and in the case of the rear ducts the tubes continue throughout at the enlarged diameter, in order to afford the necessary length required in conducting the gas-air mixture to the rear burners, I

The outer margin of each of the flared intake ends 54 is in the form of a hooked flange 56 which clamps the edge of a fixed shutter plate 51 having radiating air intake ports 58 which are fitted to register in greater or less degree with similar P rts 59 in an adjustable rotatable shutter 60 which is rotatably mounted upon a center circular flange 6| outwardly struck from the fixed shutter plate which serves as a mounting therefor, but the shutter does not constitute an essential part of the present invention and need not be described infurther detail.

In the deep die pressing of the upper end of the inner air duct 44, the sheet metal will be distended to a closed .cup' formation, the closed end of which is afterwards cut away to provide the tubular formation shown, and at the upper end the duct is provided with rolled screw threads 62 which engage the threaded neck 63 of a burner head of conventional form, which neck merges into a flared shoulder 64 which connects with a flat body ring 65 terminating in a flared rim Eli.

The under surface of the flared rim is provided with a multiplicity of radiating ribs 61 which make interrupted contact with the upper flared surface of the throat flange 4l,'thus affording a ring of outer burner ports 68 which combine with inner burner ports 59, drilled through the shoulder 64, thereby making provision for inner and outer rings of flame jets. The burner head is preferably in the form of an aluminum die casting, but the particular arrangement and formation of burner flame ports follows conventional lines, and this portion of the structure is not to be regarded as an essential feature of thepresent invention.

The outer lips 35 of the flash tubes are entered through the adjacent walls of the upper sections.

of the respective burners so that the connection thus afforded, in conjunction with the hooked flanges 32 at the inner ends of the flash tubes, affords a firm connection for the parts so that the use ofextraneousfastening means is unnecessary, and a gas passage to the flash tube is provided.

. The parts in the'form described may be very easily configured and readily assembled into a flrm and rigid structure and united together by the hooked tongues and spot-welding so that there will be no necessity for the employment of screws, bolts, or like extraneous fastenings which may become easily loosened or corroded during an extended period of use.

- The body plate section consists of a single stamping properly configured to provide for the socketing of the gas-air ducts and the flash tubes and suitably reenforced by, the ribbing to prevent bending or distortion. The gas-air ducts, of Venturi formation, can be readily configured from lengths of tubing by the method disclosed in the Dewey Patent No. 2,265,723, issued December 9, 1941 which permits a plurality of ducts to be configured from a single length of tubing and afterwards cut into unit sections and fitted with the adjusting shutters for regulating the inflow of air which unites with the gas from a tube entered through the center flange 6| in the case of each of the burners. a

The burners themselves are all of identical formation and comprise upper and lower sections which may be readily pressed and spun from sheet metal, preferably aluminum, and afterwards capped by a burner head in the form of a die casting which is screwed into place to afford the rings of burnerports through which the gasair mixture is discharged. Here again extraneous fastenings are unnecessary, since the sections of the burner are formed to readily unite with one' another without additional connections,

The formation of the flash tubes is one which permits the lip at the outer end of each flash tube to project through and intothe annular chamber in the burner. and at the same time provides an exterior port for the discharge of gas ignited by the pilot light so that the formation affords a port through the lip for the inflow of gas directed inwardly toward the pilot light and for the flash back of the ignited gas to the external discharge port 34 which is located immediately below the outer ring of burner ports. Thus the formation of the flash tube is one which not only permits it to be readily secured and united in position, but also affords a suitable duct for the flash ignition of the gas mixture admitted to the burner head.'

Although the invention has been described in full detail as applying to the structure of a four headed burner assembly, it is to be understood that a similar structure, without substantial modiflcation save in details of configuration, might an interior region with a plurality of upwardly be similarly employed for an assembly of a different number of burner heads as, for instance-a" two burner assembly in which the rear burner heads were omitted, or one having some other number of burner heads radially arranged with respect to the pilot light and individually constructed in the manner heretofore described and connected with a body frame suitably configured within the principles of the present inventionto accommodate the desired number of burners, and although the tubular portions of'the structure are preferably cylindrical, a variation of such'form may be employed.

Iclaim: I

1. In 'a'gas burner assembly the combination of a body plate provided at an interior region with a plurality of upwardly extending separated bosses, aflording intervening socket grooves, a'pilot burner tube positioned adjacent the bosses, a plurality of ported burners located in spaced relation to the pilot burner tube, gas-air ducts lead ing to the respective burners'and having their intake ends in substantial alignment in front of the forward edge of the body plate, and each of the burners having leading thereto a flash tube having its inner end socketed within one of the grooves adjacent the pilot burner tube and having its outer end, entered through the wall of the associated burner and apertured exteriorly of the burner wall at a point sufficiently close to a burner port to flash ignite a gas mixture discharged from the burner.

2. In a gas burner assembly the combination of a body plate of stamped sheet-metal provided at an,interior region with a plurality of upwardly struck separated bosses, affording intervening socket grooves, a pilot burner tube positionedadjacentthe bosses, a plurality of ported burners located in spaced relation to the pilot burner tube, gas-air ducts leading to the respective burners and having'their intake ends in substantial alignment in front of the forward edge of the body plate, and each of the burners having leading thereto a flash tube having its inner end socketed within one of the grooves adjacent the pilot burner tube and having its outer end entered through the wall of the associated burner and apertured exteriorly of the burner wall at a point sufficiently close to a burner port to flash ignite a gas mixture discharged from the burner.

3. In a gas burner assembly the combination of a body plate provided at an interior region with a plurality of upwardly extending separated bosses, affording intervening socket grooves, a pilot burner tube positioned adjacent the bosses, a plurality of ported burners located in spaced relation to the pilot burner tube, gas-air ducts leading to the respective burners and having their intake ends in substantial alignment in front of the forward edge of the body plate, the burners occupying varying distances from the forward edge of the body plate, the gas-air duct leading to a more distant burner underlying the body plate and being secured thereto by spot welding, and each of the burners having leading thereto a flash tube having its inner end socketed within one of the grooves adjacent the pilot burner tube and having its outer end entered through the wall of the associated burner'and apertured exteriorly of the burner wall at a point sufllciently close to a burner 'portto flash ignite a gas mixture discharged from the burner.

4. In a gas burner assembly the combination of a body plate of stamped sheet metal provided at struck separated bosses, affording intervening socket grooves, a pilot burner tube positioned having their intake ends in substantial alignment in front of the forward edge of the body plate, the burners occupying varying distances from the forward edge of the body plate, the gasair duct leading to a more distant burner underlying the body plateand being secured thereto by spotwelding, and each of the burners having leading thereto a flash tube having its inner end socketed within one of the grooves adjacent the pilot burner tube and having its outer end entered through the wall of the associated burner and apertured'exteriorly. of the burner wall at a point sufficiently close to a burner port to flash ignite a gas mixture discharged from the burner.

i 5. In a gas burner assembly the combination of abody plate of stamped sheet metal providedat an interior region with a' plurality of upwardly struck separated bosses, affording intervening socket grooves, a pilot burner tube positioned adjacentthe bosses, a plurality of ported burners located in spaced relation to the pilot burner tube, gaseair ducts leading to the respective burners andhaving their intake ends in substantial alignment in front of the forward edge of the body plate, the burners occupyingv'arying distances'from the forward edge of the body plate,

the gas-air duct leading to a more distant burner underlying the body plate and being secured thereto by spotwelding, the body plate beingconflgured to afford an arching ridge above the gasair duct'for s'ocketing thev same, and each of the burners having leading thereto a dash tube having its inner end socketed within one of the grooves adjacent the pilotburne'r tube and having its outer end entered thrbugh the wall ofzthe associated burner and apertured exteriorly of the burner wall at a point sufficiently close to a burner port to fiashignite a gas mixture discharged from the burner. I

6. In a gas burner assembly the combination of an apertured body plate of stamped sheet metal having at an intermediate region a pilot 0 burner tube secured below the plate aperture in position to discharge a pilot flame upwardly through the plate, a plurality of separated bosses struck upwardly from the body plate, providing intervening socket grooves adjacent the" pilot burner tube, the body plate being configured to afford a pair of spaced arched ridges leading from its forward edge, a pair of gas-air ducts aligned at their forward intake ends and having their intermediate portions socketed within said ridges and secured thereto by spot welding, a pair of ported burners secured to the rear ends of said ducts, a pair of flash tubes having their innerv ends socketed within the socket grooves and having their outer ends terminating adjacent the burners at a point sufficiently close to a port thereof to flash ignite a gas mixture discharged from said respective burners.

7. In a gas burner assembly the combination of an apertured body plate of stamped sheet metal having at an intermediate region a pilot burner Tl ing socket grooves adjacent the pilot burner tube,

the body plate being configured to afford a pair of spaced arched ridges defining channel sockets leading from itscforward edge, a pair of gas air duct; aligned at their forward intake ends and each having an intermediate portion located within the channel socket of one of said ridges and secured thereto by spot welding, a pair of ported burners secured to the rear ends of said ducts,

a pair of flash tubes having their inner ends socketed within the socket grooves and having their outer ends entered through the walls of the associated burners and apertured exteriorly of said walls at a point sufiiciently close to a burner port to flash ignite a gas mixture discharged from said respective burners.

8. In a gas burner assembly the combination of an apertured body plate of stamped sheet metal having at an intermediate region a pilot burner tube secured below the plate aperture in position "to discharge a pilot flame upwardly through the plate, a plurality of separated bosses struck upwardly from the body plate, providing intervening socket grooves adjacent the pilot burner tube, the body plate being configured to afiord a pair of spaced arched ridges definingchannel sockets leading from its forward edge, a pair of gas-air being connected to the forward portion of the body Plate, and a flash tube having its inner end socketed within a socket groove in the manner first described and with its outer end associated with the forward burner in the manner first described.

9. In a gas burner assembly the combination of an apertured body plate of stamped sheet metal having at an intermediate region a, pilot burner tube secured below the plate aperture in position to discharge a pilot flame upwardlythrough the plate, a plurality ohseparated bosses struck upwardly from the body plate; providing intervening socket grooves adjacent the pilot burner tube, the

ducts aligned at their forward intake ends and each having an intermediate portion located within the channel socket of one of said ridges and secured thereto by spot welding, a pair of rear ported burners secured to the rear ends of said ducts, a pair of flash tubes having their inner ends socketed within the socket grooves and havingtheir outer ends terminating in adjacent relation to the burners at points sufliciently close to a port thereof to flash ignite a gas mixture discharged from said respective burners, a short forward gas-air duct having its forward intake end in alignment with the intake ends of the firstmentioned gas-air ducts, a forward ported burner into which the gas-air duct is entered, said burner of said walls at points sufllciently close to a burner port to' flash ignite a gas mixture discharged from said respective burners, a short forward gas-air duct having its forward intake end in alignment with the intake ends of the flrst mentioned gas-air ducts, a forward ported burner into which the gas-air duct is entered, said burner being connected to the forward portion of the body plate, and a flash tube having its inner end socketed within ra socket groove in the manner first described and with its outer end associated with the forward burner in the manner first,described.

CLARENCE L. DEWEY.