Патент USA US2122688код для вставки
July 5, 1938. F. HILL 2,122,688 DIFFUSER FOR FLUID FUEL BURNERS Filed 001;. 1'7. 1956 F151 . , INVENTOR. FRED ff/LL BY ‘ ‘ ATTORNEY . Patented-Filly 193s ' I ,Z,"1ZZ;68.8 UNITED‘ STATES‘ PATENT OFFICE‘ I - 2,122,688 _ ‘ nil-‘roses ‘I-‘o'n FLUID FUEL BUaNEns ' 7 Application _ ‘moOctober mu, sen 17,Francisco, 1936, Serial Calif. No. 106,140. ' 1.0mm (Cl. 158-15) This invention relates" to diffusers for ?uid , manufacture, and to otherwise generally im fuel burners and has particular reference to im- prove upon known diffuser devices for ?uid fuel provements in structural features of suchv dif- burners. fusers. These diffusers are also variously called ,. 5 de?ectors, diffusers, smelds'orjcones,‘ and their purpose is to control the spread of ?ame at the ' ‘ / ' With the foregoing and other objects in view, all of which will be more apparent as this de- 5 scription proceeds, the, invention is exempli?ed discharge ori?ce of a ?uid fuel burner‘ so that‘ in one form in the novel construction herein ' the flame will be directed to a point in the' fur- ' after described, illustrated in the accompanying nace where the heat will be most‘e?edtlvely em- ' drawing, and pointed out in the claims hereto v1o ployed. In order that sufficient volume’of air- appended, ‘it being understood that various 10 may enter the shield or, diffuser 'to support'com- changes in the form, proportion, size and details bustion at the burner nozzle,'ori?ces are providedin the diffuser or'shield. Conica?y‘shaped' diffusers are well-known in this ‘art, but they ' 15 have had several principal shortcomings. Fir'st- of construction of the apparatus may be re sorted to within the scope of the appended claims without departing from the spirit or sac- ‘ ri?cing any of the advantages vof the invention. 15 ly, that the fuel is projected too great a distance i To more- clearly comprehend the invention, into the‘ combustion chamber of the furnace be-' reference is directed to the accompanying draw fore‘it spreads to the furnace walls, and sec- ondly, lack of sufficient-supply of air to- sup; 20 port adequate combustion within the diffuser has prevented the most e?icient utilization of ing whereinz' ' ,Fig. 1 is a longitudinal vertical section of vthe invention‘ mounted at a‘ furnace ‘opening or 20 throat through which fuel‘ is fed to the com heat in the furnace; thirdly, due to egp'ansion bustionchamber. ‘ ‘ and contraction'of'the diffuser walls under ac- v ' Fig. 2 is a rear view of the invention taken tual operating service, the walls oi'the diffuser 2-5 crack'and break after a very short period of use. This invention may be employed with either ‘the rotating type of oil'bumer or the non-rotating type wherein the liquid fuel under pressure is from the right in Fig. 3. ' Fig. 3 is a longitudinal vertical transverse sec- 25 tion on line III-—III of Fig. '2. _ \ I ‘ - l - .Fig. 4 is a longitudinal vertical section ‘of a modi?ed form of the'invention- ‘ f v _, atomized at some‘point in its line of ThereFig-- 5 1S 8- ?‘ailmentary Segment of the mod-3i’ :30 fore, it is‘ to be’ understood that the invention ifled form of the invention shown in Fig. 4, en- 30 is not limited to a, particular type'o'f ?uid fuel Mla‘rged to show detail. of structure of ‘slots in thei burner, but that the burner herelmdescribed and" adapter body,'the view ‘being from the outside. , illustrated is for illustrative purposes by way~of. ,, Referring to the drawing in which like char- 1 example of one form of use of the invention." - acters of reference indicate ‘corresponding parts 3' I have found by actual experiment and de'm- in -the several views,‘_ to indicates generally a '35 onstration ‘that a, diffuser ‘is moreje?icient'and lasts for a considerably longer of time burner housing of a suitabletype'of furnace in; ,which illsthe combustion chamberand l2 in-v without "cracking or breaking under; actuallop- dicates the furnace opening'dr throat. ‘Suit-. erating'serviceconditions if the 'wall thereof is , able doors‘ l3 ‘may be provided at the burner'nll formed in the general shape of a bell, the wall housing for purposes of furnishing draft,.the 40 4O of which'in-longitudinal section has a compound or ogee curve. ~ ' ' , - Y‘ ‘ opening of the doorsbeingadjustable' by a rack ' bar HLF-Asuitable burner member 'I5'of‘ any,‘ ' The objects of this invention ‘are to‘ ‘provide acceptable ‘ design éxtendsthrough an‘ opening" an'improved diffuser for ?uid fuel burners which‘ it“ in the forward wall of the burnerwhousing ‘ will direct aeilame/from a'burner tip to the point‘ ' i0. ' For purposes of ‘illustrating one ex'ar'ripleiof 4,5 of‘ greatest combustion value in afurnace; to- use‘ of'l'the' invention, th'e'burner' member 15 is .1 provide a- diffuser for ?uid‘ fuel' burners which‘_ shown vas an ordinary pressure ,burnverlha'vin‘g a ' will be maintained at relatively low temperature nozzle: I6, an, atomizer ‘I7. and a j hood, i8_ sur- i. I. 7 adjacent the nozzle of the burner;- to' provide 'roun'cling the nozzle"v ‘tip. to prevent draft from, ' f 50' in a‘ burner for ?uid fuel, a diffuser for ac- directly striking the discharge orifice of the non-a 50, complishing the foregoing objects and which will also cause the atomized fuel to whirl as it leaves the burner nozzle; to Provide a diffuser for fluid fuel burners which is e?lcient in oper- zle £5. The burner member, as illustrated,_ex_-' ' tends longitudinally through an air conduit l9, which removably mounts the diffuser 20, adja- ‘ cent the discharge end of the burner. The dif-' 55 ation, simple in structure and, economical to fuser 28 comprises a hollow body, the inner face‘ 55 ' 2 2,122,000 of which is substantially concentric relative to the longitudinal axis of the diffuser;I but has Thedirectionoftravel ofthe?ameisindi cated by the dotted lines 3. in Pig. 1. .Having thus described my invention, what I claim and desire to secure by Letters Patent of progressively increasing diameters ' from the burner-receiving portion to the oppositeend ‘of the diffuser, so that the wall of the diffuser in the United States is: transverse section through the longitudinal axis of the diffuser is delineated by a compound curve which is concave at the portion 2i adja cent the mouth 22, ‘which would correspond to 10 the sound bow of a bell, the concavity of the curve ?attening out at 28 and fading into a convex curve 24 at the portion adjacent the burner and'which would correspond to the shoul der of a bell, the radius of the arc of the con 15 cave curve being greater than the radius‘ of the - - l0 said body wall in longitudinal section through the axis of the diffuser having its inner-face deiin-: eated by a compound curve in which the por tion adjacent the said one end of the diffuser body is concave and the portion adjacent the 15 arc of the convex curved portion. At the apex 25, or what would ‘correspond to the cannon of a bell, a collar 26 is provided which ?ts circum burner receiving opening is convex. ‘ 2. A'di?user for ?uid fuel vburners compris ferentially around the conduit I9. to which it may 'be ,releasably secured by set-screws 26', whereby the di?‘user may be readily replaced, ' or may be longitudinally adjusted along the conduit is to meet existing conditionsvof de sired combustion within the furnace. In that 26 rearward portion of the body which is most near- 1 ' 1y radial to the collar 28, the diffuser is'provided with a plurality of circumferentially arranged and relatively spaced openings 21. These open ings 21 comprise aplurality of elongated slots 30 having their side edges correspondingiwithl the outer and inner faces of the diffuser body' and preferably have their end walls 28 substantially - 2 portion adjacent the said .one ‘end of the dif fuser body is concave and the portion adjacent the burner receiving opening is convex, the ra dius of the arc of the concavelyv curved portion being greater than the radius of the arc of the’ convexedly curved portion, said body'having a parallel with the axis thereof. This arrange , ment of the openings 2'! permits air from the plurality of relatively spaced-openings adjacent the burner receiving opening. ’ ' 3. A diffuser for ?uid fuel burners comprising 35 draft doors II to enter cient to adequately support combustion is sup plied within the di?'user. The draft of air thus entering the diffuser also serves to keep the wall 0 of the diffuser relatively cool closely adjacent the burner so that the life of the diffuser is pro longed. As the air entering openings 21‘ mixes with the atomized fuel it naturally becomes rap-' idly and intensely heated so that it expands as 45 it reaches the mouth 22 of the diffuser and thus it carries the ?ame along the outwardly-?aring hollow body open at one end and having the 35 inner face of the body wall tapered inwardly from the said one end toward its opposite end through the axis of the diffuser having its inner face delineated by'a compoundv cur-vein which the portion adjacent the said one end" of the diffuser body is r wall adjacent the mouth 22 of the di?'use , until the ?ame reaches the edge of the mouth. At - radius of the arc‘ of the concavely, curved por the mouth 22 the diffuser is in spaced relation tion‘ being greater than ‘the radius of the arc to the throat l2 of the furnace as at 29. Through of the convexedly curved portion, said bodyhav this space 29 additional air from the draft door ing a plurality of circumferentially arranged rel it picks up the ?ame and carries it into the _ atively spaced openings adjacent the burner re ceiving opening, the side walls within said open furnace combustion chamber i I, but the air en tering through the slots 21 having expanded due ings being inclined at an angle to the radius of ' “to the heat, the ?ame expands immediately upon entering the combustion chamber of the furnace, instead of'being projected a considerable dis tance into the combustion chamber before it expands. This increases the temperature of the 60 combustion chamber at the feed end and'there-v by makes the fuel more emcient- and reduces the the body. 55 total-fuel cost. - > ' In the modi?cation’ of Fig. 4. the elongated slots 21. are radial \to the longitudinal axis of the diffuser on the inner face thereof, but the side walls 2'!- of the slots are angularly inclined substantially 45° laterally to the inner face of the diffuser so that the opening in the outer wall is offset from the opening in the inner wall. By 70 such arrangement of the slots 21 the inrushing draft tends to whirl the ?ame within the dif fuser. I ' ‘ concave and the portion adjacent the burner re ceiving opening is convex, the radius of .the arc of the concavely curved portion being than the. radius curved portion.