US1579881A

US1579881A - Oil burner

Info

Publication number: US1579881A
Application number: US501029A
Authority: US
Inventors: Walter H Miller
Original assignee: Bethlehem Steel Corp
Current assignee: Bethlehem Steel Corp
Priority date: 1921-09-16
Filing date: 1921-09-16
Publication date: 1926-04-06
Anticipated expiration: 1943-04-06

Description

- W.. H. MILLER OIL BURNER Filad Sept. 16,

Patented Apr. 6, 1926.

Unirse sra-'rss PA TENT/@Fmt WALTER H. MILLER, oF LEBANon,-PENNSYLVANIA, Assenonro BETHLEHEM sTEEL ooMPANY, 0E BETHLEHEM, PENNSYLVANIA.

oir. EENEE.

To @Uw/om` t may concern."

Beit known thatY I, WALTER' I'rhliLLEn, a citizen of the United States, a resident of Lebanon, county ofLeb'anon, and State of Pennsylvania, have invented certain new and useful Improvements in Oil Burners, of which the following' is a specification. c

This invention relates to liquid fuel burn; ers for heating purposes', and is particularly adapted ttor burning tar. It includes a steam orcompressedy air ejector so arranged that it will, by its suction orthe partial vacuum created by' it, draw the tar'jat the desired rate for burningtroin a source of sup'- ply, thus avoiding the necessityrfor maintaining the tar under pressure and the incident expense for mechanism for produc-ing and maintaining suchpressure. It includes means forpaltomizing the ejected cil mixed With air or steam, solely through the? action I of a circular jet of steam or air as distinguished from a. mechanical atomizer, and it supplies vair in considerable volume under some pressure to thel atolniz'ed mixture to support combustion. The passage Ways for the liquid fuel and` gaseous fluid;throughout `the burner through and including the discharge end haue no valves, contra'ctedy portions or any stationary physical'. lching interposed in the path of trayelof the iiuid', and"A thus the lionr is free and unobstructed throughout.Kv The device is of such. simple construction that.v it maybe made in the lield by ordinary mechanics from'st'andard pipes, pipe couplings and bushings, without niaq chining or other Work except connecting the parts together inY properv relationsby screw threaded joints. Thesupplies otl liquid Vfuel andgaseous fluid areregulated solely by Valves. in the gaseous yfluid supply pipes, and it hask been foundin practice that this simple devicelis.` capable of such regulationv as to ,insure complete combustion ofl tar delivered to it, Without the aid of gaseous fuel as has beenfound necessary with most other types ofttar burners. rllhenoyel features Will be more fully understood from the followingy description andV claims taken with the dran/ings.,

In thedrawingszc l, c l Y Figure .1j is a longitudinal section through the burner proper, and",4 c c Figurekis aside View ofthe burner with its pipe connections..

In the embodiment ofthe invention shown in the drawin 0s' the small, inner pipe'lO is tion with one of the openingsin `the coui pling 13, and itsdischarge end projects' Some .distance from the oppositeA side of the con pling.v A pipe 15' is connected to thethird side opening 1o of the coupling 13 and supplies a liquid fuel and has a branch pipe 17 connected tof a supply of' tar which is p-referably'iheated so-as to render 'it suiii ciently fluid to be drawn up into the burner. The pipe 15y is also connected by a branch 18 to a source of oil supply'for use in starting the operation of the yburner betoreopen# ing theconnection for the` supply of tar. A pipe 19` has` screw threaded engagement at one end in the opening in the"k coupling 13 around pipe 10andl is concentric therewith and extends materially beyond the `end of pipe 10. Apipecoupling 2O surrounds the pipe 19 near'the coupling 13 and the pipe 19' passe'sthrough the bi'ishinfg 21"in one ot' the aligned openings of the coupling 2Ov and isvr thereby connected to the coupling. A

nectedtto'th'efthird opening 23 "of the coupling 2l) `and has valve controlled branches 2ey and 25' adapted to be `connected respectiiely to a` containerfor compressed air and a' sourjceiof'steam.' Apipe`26 is secured at one end in the'opening in the coupling around the pipe '19 and projects there :troinaround and concentric to the pipe 19 to approximately. its discharge end. Preterably the pipe 26 terminates a little short o t the end' of the pipe 19 l pipe coupling 27' surrounds the tufo pipes 19 and 26 which pass centrally. through its two aligned kopenings andare yheld"V in pla/'ce' by tliebushing 28 engaging theouter pipe' 2G and one of ther tion. The air may be forced in through a pipe SO by a fan or other suitable means.

In operation the jet of compressed air or steam discharged by pipe 10 into the pipe 19 will, because of the small circular space around it and the length of the pipe 19 beyond the discharge, act as an ejector creating a partial Vacuum behind the point of discharge thus drawing the tar from vthe source of supply through the pipe 15 without the necessity of applying pressure to the tar supply. rlhe tar and steam or air will be more or less intimately mixed during their passage through the pipe 19 and at the discharge end of that pipe the circular jet of compressed air or steam from the pipe .26 will servel to thoroughly atomize the mixture and the air supplied tl'irougli pipe 30 around -the discharge end of said pipe will be distributed throughout the atoinized mixture and support combustion. As shown, suitable valves are used to regulate and control the supply of the gaseous fiuid in the form of steam or compressed air and the supply of liquid fuel is regulated, indirectly, by these valves. The fan blast through pipe 30 may also be controlled by an ordinary valve mechanism.

Having thus described my invention what is claimed as new and desired to be secured by Letters Patent is:

l. In a liquid fuel burner, the combination of' a mixing tube connected to a source of fuel supply, means providing a jet-of motive fluid in the mixing tube for the entrainment of fuel, for admixtuie with the latter, and for the translation of the resultant mixture, a second mixing tube coaxial with the first mixing tube, of materially larger diameter than the latter and having the discharge end portion of the first mixing tube arranged therein, means providing an annular jet of motive fluid between the tubes for atomizing the mixture discharged from the first tube, means for passing a forced-d `aft stream of air about the last-named means for admixture with the atomized mixture, and means for regulating the fiow of air through the last-nained means to secure proper adinixture of such air with the. atomized mixture issuing from the first mixing tube.

2. The combination with an ejector` for entraining liquid fuel by a jet of highvelocity motive fluid and including a mixing tube for the discharge of the resultant mixture of motive fluid and fuel, of a second mixing tube of materially larger diameter than the first mixing tube and overlapping the discharge end of the. latter, a tube member surrounding the first. mixing tube, having its discharge end arranged between the mixing tubes, and being connected to a source of fiuid under pressure to provide for an annular jet of motive fiuid to atomize means for regulating the flow of air through the last-named means tov secure proper adinixture thereof with theatomized mixture issuing from the first mixing tube, at a point back of the annular jet.

3. In a liquid fuel burner, the combination of a mixing tube connected to a source of fuel supply, means providing a jet of motive fiuid in the mixing tube for the entrainment of fuel, for admixture with the latter, and for translation of the resultant mixture, a second mixing tube coaxial with the first mixing tube, of materially larger diameter than the latter and having its inlet end portion overlapping the discharge end portion of the first mixing tube, an air supply chamber surrounding the first mixing tube and in open communicationV with the inlet end of the second mixing tube, va mo-' tive fluid supply tube teleseopically arranged with respect to the first mixing tube,traversing said air chamber, and terminating wit-hin the inlet end of the second mixing tube to provide, with respect to the first mixing tube, an annular jet discharging into the second mixing tube.

4. In a liquid fuel burner, the combination of a first mixing tube of uniform diameter, a second mixing tube of uniform but of larger diameter than the first tube, the discharge end portion of the first tube being disposed within the inlet end portion of the second tube, a vfirst motive fluid tube for supplying a jet of motive fluid axially of and within the first tube, vmeans for supplying fuel to the first tube rearwardly of the discharge end of the first motive fiuid tube, a second motive fluid tube surrounding the first mixing tube and having its discharge end arranged between the inletend of the second mixing tube and the discharge end of the first mixing tube, an air supply chambei' surrounding the second motive fluid tube and in open communication with the second mixing tube.

5. In a liquid fuel burn-er, the combination of a first mixing tube of uniform diameter, a second mixing tube of uniform but larger diameter than the first tube, the discharge end portion of the first tube being disposed within the inlet end portion of the second tube, a first T-coupling having one arm connected to the inlet end of the first mixing tube, a first motive fluid supply tube connected to and passing through the opposed arm of the coupling and terminating within and rearwardly of the inlet end of the first mixing tube, liquid fuel supply means connected to the third arm of'tlie coupling, a second T-coupling surrounding and having one arm connected to the first Vmixing tube, a second motive fluid tube connected to the opposed armof the second coupling and telescopically arranged with respect to the first mixing tube, means for supplying motive fluid to the third arm of the second coupling, a third coupling surrounding the telescoping first mixing and arm connected to the second motive fluid tube and having its opposed arm connected to the second mixing tube, and means for supplying air to the third arm of the third coupling. 'y

6. A burner construction of the type described comprising, in combination, an inner pipe for gaseous fluid under highk pressure having a substantially uniform inner diameter to and including its discharge end, a concentric unobstructed tube of uniform diameter surrounding the discharge endy of said first mentioned tube and extending a material distance beyond that discharge end; means connecting. said last mentioned tube at the rear of the discharge end of said i first tube to a source of supply of liquid fuel, the relative sizes of said tubes being such that they will act as an ejector creating a partial vacuum in the rear of the inner pipe discharge thus drawing in the liquid fuel, and means at the outlet end of said second mentioned tube for subjecting the escaping mixture of liquid fuel and gaseous fluid to a surrounding jet of gaseous fluid vto atomizeit, and an enlarged tube of uni-` at its inner endV for a short distance and discharging therein, means for forcing gaseous fluid under pressure through said innermost pipe into said next outer pipe, producing suction by 'ejector action, means connecting said next outer pipe to a source of supply of liquid fuel' whereby said fuel will be drawn into said pipe solely by the suction produced by the e3ector action of the gaseous fluid, the next outer pipe around the last mentioned pipe terminating at approximately the outlet end of said lastmentioned pipe, and means for passing gaseous fluid through said last mentioned pipe which in escapingk spraysthe escaping mixture of liquid fuel and gaseous fluid, and an enlarged outer pipe for supplying air under pressure to aid in supporting combustion.

8. A tai' burner comprising iii combination a series of concentrically arranged spaced pipes each being of uniform diameter a thir throughout including its discharge end, the

inner and smallest pipe of the series for steam or compressed air entering the end of the next outer pipe in the'series for liquid fuel .for only ak small portion of its length at its inlet end, the next outer pipe for compressed air or steam surrounding said fuel second motive fluid tubes and having oney lto a pointv near its inlet end and spaced pipe vfrom approximately its discharge end therefrom only Va short distance andthe outermost pipe of the series for a blast of port combustion.

,A burner of the type described comprising in combination, a pipe coupling having a pipe secured at one end in one of its VJiwo aligned openings fand extending a material distance therefrom, a bushing in the opposite opening of ysaid coupling,-a pipe having a diameter less than that of the first pipe extendingthrough-said bushing concentrically into the end of said first pipe, 4

llan inlet pipe for liquid fuel connected to the third side opening of said coupling, a second larger pipe coupling having a pipe secured in and projecting from one of its aligned openings and a bushing in the other aligned opening the ysaid second mentioned pipe passing through said last mentioned bushn ing, coupling and pipe approximately to the end of the pipe and an inlet pipe for gaseous fluid under pressure connected to the third side opening of the last mentioned bushing,

pipe coupling materially larger than the others having a pipe secured at one end in one of its aligned openings and projecting therefrom and a bushing in the other aligned opening through which thel last two previlGO ously mentioned pipes pass into the end of f the last mentioned pipe andan air supply pipe connected to the third side opening of said last mentioned bushing.

lO. A burner of the type described coniprising in combination, a pipe coupling having'a pipe of uniforminterior diameter secured at one end in one of its two aligned openings and extending a material distance therefrom, a bushing in the oppositev opening of said coupling,'a pipe having a uniform interior diameter less than that of the first pipe extending through said bushing concentrically into e end of said first pipe, an inlet pipe for liquid fuel connected to the third side opening of said coupling, a second larger pipe coupling having a pipe of uniform diameter secured in and projecting from one of its aligned openings and a bushing in the other aligned opening the said second mentioned pipe passing through said last mentioned bushing, coupling andfpipe approximately` to the end of the pipe and an inlet pipe for gaseous Huid under pressure 'connected t0 the third 'iside opening of ille lust mentioned bushing-a third pipe 'conplingnmcerizi'lly larger than the others luwing ,a pipe of uniform -'clififmeterl secured at one enel in one of 4ite, aligned openings and projecting therefrom and -a bushing in ythe other aligned 'opening' through Which-fthe .last two previously lmentioned pipee` lpaies into 1blue end; of the last mentioned pipe und 10 an Yair supply pipe Connected to the uLhircl side Open-ing Iof said last mentioned bushing.

` lin 'testimony 'whereof I hereunto affix my signature.

WALTER H. MILLER,