US1686711A - Gas burner - Google Patents

Description

z sneatssnear Oct. 9, 1928.

H. D. SCHRADER GAS Burnham` Filed nay 31. 1927 Patented @et 9, 1928.-

xrThis invention relates to improvements gas burners.

a gas burner which will have a great heating capacity and a high efficiency and which will be of simple and substantial construct-ion.v

It is a further'object. of thisinvention to produce a gas burner combining two separately operating burners one of `which employs a Venturi tube and in which the air is mixed of the tube andthe other of which discharges the gas near the tip of the former burner and vfor which the air is inspirated by the action of the gas as it leaves the burner.

It is a still further object of lthis invention t'o produce a gas burner of great'iexibility use in connection with small commercial appliances and house heating furnaces and boilers.

come apparent as the description proceeds are attained'by means of an larrangement and -a combination of parts that will now be described in detail and reference for this purpose will now be had to the accompanying drawings in which the preferred embodiment Y of my invention has been shown and in which Fig. 1 is a 'vertical diametrical section through the lower end ofthe furnace, show'- ing my im roved burner in place therein;

Fig. 2 is a section taken on line 2-2, Fig. 1; Fig- 3 is a detail showing the construction of the gas adjusting valve member;

Fig. 4 is a vertical longitudinal section through the burner;

Fig. 5 is a section vtaken on line 5v5, Fig. 4;

Fig.,7 is a section taken on line 7-7, Fig. 4,

My improved gas burner has been illustrated in connection with a furnace whose cylindrical wall has been designated by numeral 1. The lower portion of this furnace has been shown as lined with alayer of fire brick or clay 2. The bottom of the v{irebox' is formed by aA circular slab 3 of 'fire' cla-y lfrom whose center a square or other shaped column '4 extends upwardly. The slab, 3'is rovided with two parallel passages 5 and 6 which communicate respectively with the verV tical'openings 7 and 8 of column 4. The upper end of column 4 has a conical recess 9 which supports the inner ends ofthe radial bars 10 whose outer ends are supported on the Application 'filed Hay i 31,

Itis the object of this invention to produce` with the ygas at or near the intake end e that shall be particularly well adapted for The. above and other objects that may. be-

Fig. 6 is a section taken online 6--6, Fig. 40 4; and

sesam A UNITED s'ruriazsv PfATsNr erstes.

HARQLD D. SCHRADEB, OF DENVER, COLORADO.

Gas BURNER- 1927. serial No. 195,285.

upper end of the cylindrical wall 2. 4A c'ollection of" broken tire brick or otherhighly vrefractory material 11 is supported. on the barslO and'when these are heated to inc'an- 60. descence, they Aresemble a bed of live coals f andserve to store and to radiate. heat. The

furnace walll and lining 2 are provided with registering openings 12 for the reception of` the burner assembly which will now be described in detail. The burnerconsists of a Venturi tube 13 whose end -is provided with a transverse wall having a plurality-of openings 14. The outer s'urfaceof the flared end of this tube has a 70 cylindrical portion l5 which is ada ted toreceive one end of the mixing hea 1 6.- The" transverse'wall of the Venturi tube has a hub 17 that projects rearwardly and whose -outer surface is threaded for the reception of the 'air regulating plate or shutter. 18 which will be moved towardsfor away from the transversewallwhen it is rotated and which can be Aclamped 'in adjusted position by means of a' set screw 19. Hub 17 has a 80 cylindrical opening withinwhich is slidably mounted the primaryv burner regulating valve body 20. This body has a.cylindrioal` axial opening 21 which communicates with thetransverse opening that passes through S5 the lateral extensions 22 and 23. A nozzle 24 has a threaded engagement with' the wall of opening 21. This nozzle has an axial opening 25 that terminates in the smaller opening 26. A stem 27 has a threaded portion .9'0 2S hich cooperates with a threaded ope ing 29 in the outer end of the wall body. A lock nut 30 serves to hold this stem in adjusted position. Stem 27 has the Asame outside diameter as the o ening 25 and 1s pro- 95 vided with a tip 31 which is of the same size as the opening 26 and is lutedlike a reamer. The maximum diameter of the tip 31 is less than that of the stem 27 and terminates in a shoulder 32. That portion of the stem adjacentr the shoulder 32v is provided with v tapering grooves v33 which form passages for the gas. When the stem is rotated so as to -move into the nozzle 24, the area through which thev gas may flow is gradually de-- creased until when the grooves 33 are en- 'tirely within the nozzle the flow of gas 'will' be' entirely shut oit. If hole -26 hecomes stopped, it canbe opened by turning the stem 27 until the point 31 extends entirely 11o throughthe opening 26. The position of vstem 27 is adjusted tosuit the conditions under .which the burner operates; The inner en d of the Venturi tube is threaded, as indi- I cated by numeral 34. .A burner head body has Ca central hub portion 35 which has a nected with the cylindrical part 39 and its rear end connected with the front end of the mixing head 16. The burner head body, nthe pipe 41 andthe mixing head 16 are iirst assembled after which theVenturi tube isinserted throughthe open end rof the as sembly `and screwed into the threaded opening 36. A gasket 42 islocatedon thecylindric'al surface v15`between the end ofthe .mixing `head andthe external shoulder Yat the end of surface 15. When the'parts are lar chamber is ormedbetween pipe 41 and tube 13. A burner nozzle 43. has one end Y providedjwith a threaded section that envgages with the threads in opening 37' and has a conical vsurface 44 that is parallel with theparallel surface forming the end o vpart 40. .By means of a washer'45 of sultable thickness the lconical surface on the nozzle andthe cooperating surface on part40 be spaced Many distance desired so as to obtain an annular opening 46 for theescepe of gas, which will lowtherefrom in a conical sheet represented by lines 47 and 48 The assembly that' has just been descrlbed is located within a cylindrical casing .formed A by a cylindrical member 49 which is smaller in -diameter 'than 'and locatedLconcentrically within asimilar cylinder 50. The twO Cylindrical members 49 *and 50 are held 1n spaced relation at their'inner ends by a ring 51 and at the other ends by 1 a.l casting having a cylin -cal section 52 and" a cylindrical iange 53^and an inclined wall 54, that connects `one ndof iiange- 53 with 4.the center -portion oft the-l;cylindrical sec;-

tion 52. A damper 55 is mounted for rotation on the outerv surface 0f the inclinedwall 54.and is provided withopemngs that-correspond in" osition and size to simi lar openings in the inclined wall 54. By nothe ring 55 the eifective areas through air may enter between members49- and 50--c'an be adjusted td any' extent desired.-

.Secured to pipe 41 is affhub v57 a -plu'-,` rality .of radially pro'ecti'g kes or blades 58 tha t resemble fan lades. e' outer ends of these bladesengage the inner-surface of f is nom" g' ,am sans ong '- nited at the 'burner 't'.p`43,l forms a register with the latter. By `rotating plate 64 the elective area. of openings 63 can be.

altered as desired.l Located within the front end of the cylindrical member 49 is a ring 65 of @refractory material. This ring has its Vinner surface curved in the manner. shown in Fig.4 and/the surface marked X. is parf allelf with lines 47 and 4 8;

Gas under the appropriate pressure isconducted to .the device through pipel 66, which is connected with the proper gas supply.

Pipe'66 is connected to the mixing head 16 at 467 and is proridedwith yan electr1callyoper ated valve 68,.that can be controlledfrom a ;dlstance, and with a; pressure controlled valve `assembled as described, an' elongated annu`V 69 which Vis connected'Y withthe boiler` by means of v'pipes-70.l A lever or arm 7l has one end connected with the'va-lve mechanism of valve 69 and the other connected with the 'pla-te 64 and rotates the plate so as Vto close the openings '63 whenever valve 69 closes.

A' ipe 72 has one. end connected .with pipe66.

at 3-and the otherto'member 20. at 23; A

-stop cock 74 controls theflowof gas through this pipe. Another pipeV 7 5 has oneend con. nectedwith' the mixing head at-76 and the, other connected with member 2 0 at2 2.. This pipe provided with a check valve'77 t-ht permits to flow-from the interior of mixn head to the regulating valve but pre flowing inl the .opposite` direcvente` tion. i

Letns now'` assembled `inthe manner-'described and lthat asuction'thatcausesair toffl'ew e combustible 'of gas and fair when ig Y c hot iame. APart of the gas for-the primary burner Hows lh'pipe,-72 and valve 74'and the rem erthrough pipe v7 5. Gas will alsolown ain through the ann ar space between the out'2 sideo the This thinsheet of-gas issuefinV the" of a'hollow cone and pass parallel' with, and

close to surface XL The low .of gas from' o' 46 produces a suction thatcauseslaii member 49 and serves to` center the burner` assembly. Another cylindrical tubular sec-v I I "le thattheparts" have been.'v

- burner" =Th9`f0w 9i? Venturitube and the inside of pipe `41and out throughthe-narow opening 46.` s ape blades 64 and thence through holes 78 in the refractory ring'` 65. The suction produced by the ow of gas alsov causes a stream of air t`o How inwardly through openings 56 through oV the butter y valve' 80 into the space between pipe 41 and the interior of. the cylindrical member 49 where it is mixed with the cold air that enters through openings 63. The air v that flows vthrough the passageways 7 and 8 in the column 4 gets very hot as this support Y them to mix thoroughly.

a single justing the isks so as to produce almost e is located directly in the path of the iame and is usuall incandescent. B yproperly ad- 64 and 55 any desired proportions of cold and hotair can be obtained. As the cold-and the hot air pass the blades. 58, they are given a rotary motion that causes` When the pressure in the boilerfexceeds a predetermined value, valvel 69 closes Aand when this occurs the openings 63 will also be closed by the disk 64 which is operatively Y connected with this valve by means of the arm 71. Whenever valve 69` closes the secondary. `burner will cease to function and at the same time theonl gas thatwill-reach the primary burner will e'that whichows through pipe 72 and this can be adjusted so. that the heat produced Vby the primary burner will be just about suiiicletto jmaintain the temperature of the furnace or the pressure ofthe boiler constant. When valve 69`opens after having been closed, the primary burner will serve to ignite the gas.- A pilot light (not shown).

isprovided for igniting the -primary burner.

By combining the burners in the manner shown, a eaterflexibility is'obtained Athan if urneriwere used as with the two burners these can be `so adjusted that a quick increase inthe heat can be obtained' `when both are operating and when the .primary biirner is used alone, this can be regulated tain the temperature at the desired value l after 'it has been brought there by the combined aetionof both burners.'

vHaving described my invention" what I claim as new is: f

1. A compound gas burner comprisin 'aj 'prima burner formed in artfrom a en turi tu e and a secondary lirner having an annular passa eway formed by the outer surface' of the enturi tube and by the inner surface of apipe cmcentric therewithl and independently 'controlled means for adnitting air 'and gas to the interior- 'of the tube 'I and to the annular space. Y

. in combination,

2. A compound gas' burner compri-sing,

a Venturi tube having its.

the main portion of the tube, the outer surfaceA of the'aredend having; a cylindrical surfaceprovided' with a shoulder, a ipe enclosing the Venturitube, a' mixing ead sel cured to the pipe,.'said 'head having] a .eylin- A enings 5, 7, 8 and 6, pipe- 79 past nough heat to maindrical portion adapted to lit onto the cylindrical surface, a gasket located between the shoulder and the end of the mixing head and means for connecting the other end ofthe Venturi tube to the adjacent end of the pipe and for forcing the end of the mixing head v against the gasket.

3. A`compound gas burnerrcomprising, 1n comblnatlon,

flaring and of a greater diameter than the a Venturitube having its base f `main portion of the tube,.the outer'vsurface of the flared end having a vcylindrical surface provided with a shoulder, a pipe enclosing the Venturi tube, a mixing head securedto the pipe, said head having a cylindrical portion adapted to fit onto' the 'cylindrical surface, a gasket located between the shoulder and the end of the mixing head, and a burner head provided with two concentric cylindrical portions connected by a Aperforated partition, the

larger cylindrical portion-being connectedwith the pipeandthe other with the Venturi tube.

' 4. A compound'gas'-bl'1rner comprisinr, in combination, a Venturi tube havingy its ase flaring andof ai greater diameterthan the main portion of the tube, the outer surface of the-flared end having a cylindrical surface provided with a shoulder, a pipe enclosing the Venturi tube, a mixing headjsecured' to tlie pipe, said headhaving' a cylindrical portion adapted to it onto the cylindrical surface, a gasket located between the shoulder and the end of the mixing head, a burner head provided with twoy concentric cylindrical por tions connected by a perforated partition, the

larger cylindrical vportion being connected withrthe pipe and the other with the Venturi tube,'means for admitting air and the flared end of the` Venturi tube and means for admitting gas into the annular'spacebe- .tween the Venturi tube and the' pipe. e

5. A compound gas burner comprising, in =combination, Vflaring and ofz'a mainv portion of t of the flared end having a cylindrical surface rovided with a shoulder, a pipe enclosing the enturi tube, a mixing head secured to the pipe,'said headhaving a cylindrical. portion adapted to fit onto the clmdricalsurface, a gasket located betweenv t es houlder and the endof-the mixing head, a.' burner .head,pro'. vided with two concentricn cylindrical portionsconnected by al perforated partition, the',

greater diameter than the larg'l r cylindrical rtion being connected vwat the pipe and t e other -with the Venturi the foradmitting gas into the annularV space between thefVenturi tube and the" ipe, and a nozzle secured to' the ,burner hea said -noz'- aVenturi tube having its base e tube, the outer surface v zle having'an opening in line with the Venf turi tllzi, a .portion of the outer .smface of the no being eomcal and `adapted toform I .withl the r heada'circular passage for D ageway. l

- main portion of the tube, the outer surface of th ared end having a cylindricalsurface pr videdV with a shoulder, a 'pipe enclosing the Venturi tube, a mixing head securedto the pipe, said head hav-ing a cylindrical p ortionadpated to fit onto the-cylindrical surface, a gasket locatedbetween theshoulden. Aand. the end fof themixing head, a burner"I headprovided with'two concentric cylindrical portions connected by a perforatedparv, tition,'the larger cylindrical portion beirig connected with the pipe and the other with the Venturi`tube, means for admitting air l and 'gas into the flared end ofthe. Venturi tube and means' :for admitting gas into the annula space between the'LVent-uri tubeand l the pipe', a nozzlejsecured to the burner head,

' said nozzle '-,having'an opening in linewith the Venturi .tubea portionv of the outersurface ofthe-nozzlebeing conicaland adapted to form with the burner head a circular pas'- passageway, a cylindrical 'closure enclosing the-plpe, means for spacing the pipe and burner .from the closure, means Slidably oonnected with the. pipe and adapted to engage the end of the'cylindricalgclosure and means comprising. a spring for holding the slidable v means against the end of the-cylindrical 'clo- V 74A Inground gs'blll'eer Compl-lans primary b rner composed of' a Venturi tube, a detachable nozzle' at one end and means at the-other fendfor admitting air andj gas, a .secondaryburner comprising a -pipe' enclosinggthe Venturi tube and spaced from. the lat- 'the partition into close Ipr outer surface of the nozz e whereby a pasthe tube at onel i ,a mixing head connecting the pipe and f2 *r f4 rncaa'a'ir-f I,

'when 'the other and, man@r for admitting lgas into the annular space, said burner head aving al transverse perforated partition and a circular fiange extending forwardly from oximity to the sageway is provided for the escape of gas, a cylindrical housing enclosing said pipe, means for spacing the pipe from the. housing and-means for admitting air` into the space between the pipe and the housing.

V l8.l A compound gas burner comprising a primary burner composed of a Venturitube,

a detachable nozzle at one endl and means. at

the'other end 'for admitting' air and gas, a

secondary burner comprising a pipe` enclosing 'the Venturi tubeand spaced fromthe latter so as to ,form an annular passage, a burner head securedtofthepipe and theltube at one -end, .a mixing lhead connecting the pipe and tube at the other end, means for admitting gas into the annular space, said burner head having a tran erse peroratedpartition and a circular a ge extending forwardly fromthe partition into close proximity to the outersurface-of the nozzle whereby a pas- A sagewayris provided' for the escape of gas, a

. .sagefor the escape of gas from the annular cylindrical housin I enclosing. said pipe,

tween the pipe and thehousing, a cylindrical member surrounding the-c indrical housing' and spaced from the latte means for'con ne'ctingthe ends oi the cylindrical `member with the cylindrical housing, means for adt mitting air into'the space between the cylindrical member and the housing. and a con# duit extendingvfrom the last mentioned space to the space between the pipe'and the cylin- -drical housing, a portion of said conduit being located in the path' of the 'flame 4from the burners. i

"In testimonywhereofil aixmy signature. I

" HAROLD n SCHRADER.

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