US2504592A

US2504592A - Pilot burner mount

Info

Publication number: US2504592A
Application number: US692284A
Authority: US
Inventors: Kurt A Scharbau; Stadler Albert
Original assignee: Eclipse Fuel Engineering Co
Current assignee: Eclipse Fuel Engineering Co
Priority date: 1945-05-30
Filing date: 1946-08-22
Publication date: 1950-04-18
Anticipated expiration: 1967-04-18

Description

April 18, 1950 K. A. scHARBAu ErrAL PILOT BURNER MOUNT 2 Sheets-Sheet 1 Original Filed May 30, 1945 INVENTOR. Jz/ 2.5M

@Yer

Patented Apr. 18, 1950 UNITED STATES PTENT OF FICE EILOTBURNER MUUNT '-Knrtl A. Scharbau-.and Albert Stadler, Rockford, 1112,. assignors to 'EclipsefEuel Engineering C0.,4 v Rockford, Ill., a:- corporation. of Illinois LOriginal.application 'May" 30, 1945, Serial" No.

5963632. Divided and thisfapplicatfon August 22', 1946, Serial No."692,284

chm'acterized#byl high 'efficiency and simplicity of design orconstruction.

Another objectief lthe'- invention is to provide a mount ofthe aforementioned typeiand character which comprises. a braoketi'embodying certain adjustmentswhereby itiis possible lso to position the pilot burner thatthe flame' emanating therefrom is properlyfdirected toward'the mainfburner.

A furtherobjectzofthe' invention is torprovide a pilot burner-mount ofthe last mentioned character in which the bracket :may be mounted in place with facility.- and :hastA associated with it simple meansifor preventing rotation offthe main gas burner tube relatively'ito. the latters support.

Other objectsaof the inventionand' the various advantages andA characteristics of.' the present pilot burner mount will be-fapparent'froma icon*- sideration. of the following detailed` description.

The invention. consistsdn` the: fseveral. novel features which are.- hereinafter'setforth.and;.are more particularly Vdeined-.lmV claims. at. the; conclusion hereof.

In the drawings whichf accompany and form a part of this specification. or dsclosureand in which like 'letters andznumeralsy ofreference denote corresponding;I parts throughout the several views:

Figure 1- is lafrertical longitudinal section of-.a mainV tube varietyburner hailingl applied4 thereto a pilot burner together withrafnilot-burnerfmount embodying the invention;

Figure 2 is a front view of the; assembly of main burner. pilot burner andV pilot burner mount;

Figure 3v is atop'ior-planview of said-assembly;

Figure 4 isA an. enlarged vertical; longitudinal section on the;pilot burner;

Figure 4l' is aperspectvefview of the baille -unit at thev discharge-endet: thetubular. body of the nilotburner; and.-

Y Fieurefis-.alpersnective v1ew-.=,of. the mountingY (Cl. 15S-H115) `bracket.constituting .the mount for supporting the pilot burner in operative position with re- .spectto-themain burner.

Themount which is shown in the drawings constitutes the preferred form or embodiment of the invention. It isillustrated in connection with a main tube Variety gas burner B.v and a, pilot burner, comprises a. mounting bracket. 6 and serves, ashereinafterf described.. to support the pilot burner inoperativemelation with the main burner .B; The.' burner. .B .isfof conventional or standard construction. It is illustrated. in connection with afurnace- E andoomprises an elongated horizontally extending tubeb.. The furnace F embodies a metallic outer shell f, an outer refractory lining -JLandan inner refractory.- lining f2; The sidefwall of' the shell of the furnace is providedwith. acircularhole f3 and this is in registry witha truste-conical 4hole f4 in the outer lining.` f1 of the furnace-F. The inner lining f2 offv the furnace isr .provided witha cylindrical hole f5=which=iseini alignment and communication with the inner or. small endof the frusta-conical hole f4 the fouter lining f l and has. mounted therein aoomhustioxr block f6. The latter, as shown in Figure l; hasf acentral horizontally extending duct f7 therethrough. The outer end of such ductis cylindrical and the inner end of the duct isinwardly flared. Saidouter end of the duct is of less diameter than-the-small end of the frustoconical hole f4 and is in centered relation and communication. with-said inner or small end of thehole f4; -Qne-endyof the tube b of the main bur-ner'Bextends through. the frusto-conical hole f4 intoithefouter end'V of theduct f7 and is supportedfby afmetallic. ooolingfwell support S. The latter comprises an annular frusto-conical side wall s .and'afcentnally'apertured inner end wallsl. Thesidew-all sits in, andfis shaped conformablyfto;.thefrusto-conicalrhole f4 in the outer refractory. llining f1 of .the furnace F and embodies attits'outer end ,anintegral outwardly extending flange s2 which. ts against the hole: defining portionof. thefurnace shell ,t and is secured theretoby bolts s3. The-inner end wall s l'of the cooling well support-Sis formedintegrally with the inner .endof .the annularside wallsfandabuts against the outer end face of the combustion .block f6.. The inner end of the burner tube b extends v.throughttl'ua central aperturein theinner endwallfsi andissecured to said inner end wall by, aiscrew. thread-171. The burner tube isrof materially greater. length than the cooling well supportwith4 the resultthat itsouter. end-is disposed exteriorly of. the support. Said 4outer end .of the end of the tube and iiows through the duct f7 in the combustion block f6 of the furnace. The upper portion of the inner or discharge end oi the burner tube is provided with an angularly disposed orilce b4. This orifice is located outwards of the inner end wall s1 of the cooling lhigh caloric value, such as propane, butane or natural gas, is supplied to the mixing chamber I 3 for admixture with the air under pressure by way of a pipe connection 22 and a port 23. The

' pipe connection 22 receives gas under atmospheric well support S and leads into the central part of the ared inner end portion of the throat b3 in the burner tube. It is inclined upwards and outwards with respect to the longitudinal axis of the throat b3 and provides means whereby the combustible gas and air mixture in transit thro-ugh the throat b3 may be ignited from' the outside of the burner tube.

The pilot burner is positioned above the central portion of the burner tube b and operates, as hereinafter described, to direct a ilame into the angularly disposed orice b4 in order to maintain in an ignited condition the gas `and air mixture ilowing through the throat of the burner tube. It is carried or supported by the mounting bracket 6 and comprises an elongated tubular body 1, a nozzle 8, a tubular tip 9 and a baille unit I0.

The body of the pilot burner is preferably formed of cast iron and has at one end thereof an integral, longitudinally extending, centrally disposed reduced stem II. The latter, as best shown in Figure 4, is provided with an external or male screw thread I2. The interior of the tubular body 'I is shaped so as to denne a cylindrical longitudinally extending open ended mix ing chamber I3 at the other end of the body, and a longitudinally extending throat I4 which leads from the inner end of the chamber I3 to and through the outer end of the reduced stem II. The mixing chamber I3 is of materially greater diameter than the throat I4 and has a female screw thread I5 at its outer end. The throat I4 flares gradually in the direction of the stem II, as shown in Figure 4. The nozzle Bof the pilot burner has an open ended, centrally disposed orifice I6 extending longitudinally therethrough and is connected by a pipe connection I'I to receive air under super atmospheric pressure from any suitable source, such, for example, as an air storage tank or compressor (not shown). One end of the nozzle extends into the outer end of the mixing chamber I 3 in the tubular body 'I and embodies an external or male screw thread I8 which is in intertting relation with the internal or female screw thread I 5 and serves to secure the nozzle 8 in connected relation with the body.v l. The other or outer end of the nozzle is of nection I1 includes a shut-off cock 2|, one end or super atmospheric pressure :from any suitable source (not shown) and is indirectly connected to the end of the tubular body I having the mixing chamber I3 by way of an internally threaded nipple 24 which is formed integrally with, and extends laterally from, the body 1. The port 23 communicates with the inner end of the nipple and leads to the inner end of the mixing chamber I3, as shown in Figure 4. A shut-oi cock 22* is included in the pipe connection 22 in order that the supply of gas to the body 'I may be cut off when the pilot burner is not in use and adjusted or regulated when the pilot burner is in use. One end of the body of the cock 22* screws into the internally threaded nipple 24. When the cock 22a is open while the-shut-oil cock 2I is open gas enters the mixing chamber I3 via the port 23 and there mixes with the jet of air under pressure emanating from the nozzle 8- to form a combustible gaseous mixture which flows from the mixing chamber through the ared throat I4. If the gas is not under super atmospheric pressure it is drawn into the mixing chamber I3 by aspiration. By reason of the fact that the throat I4 is flared in the direction of the stem II the velocity of the combustible mixture of gas and air under pressure progressively decreases as the mixture flows from the mixing chamber to and through the externally threaded stem II.

The tubular tip 9 is preferably formed of steel and has substantially the same external diameter as the cast iron body 'I. One end of the tip 9 surrounds the reduced stem I II at the discharge end oi the tubular body 'I and embodies an internal screw thread 25 which is in intertting lrelation with the external or male screw thread I2 on the stem and serves to hold the tip of the pilot burner in connected relation. The portion of the inner periphery of the tip that is outwards of the screw thread 25 is cylindrical. It is of reduced diameter and has at the inner end thereof an annular outwardly extending shoulder 2S which faces in the direction and joins the inner end of the screw thread 25. When the pilot burner is in operation the combustible mixture of gas and air under pressure, after passing through the J flared throat I4, ows into the tip 9. Combustion of the mixture takes place within the tip and the il'ame resulting from combustion projects from the tip as the result of the velocity of the mixture entering the tip.

The baille unit I 0 is located in the central portion of the tubular tip 9 and serves so to reduce the velocity of the combustible mixture entering the tip that the mixture burns in the tip. It is preferably of one-piece design or construction and comprises a pair of laterally spaced discs 21 and 28 and a stem 29 between the two discs. The disc 2'I ci the baille unit has its marlginal portion clamped between the shoulder 2B and the outer end of the reduced stem II and embodies inwards of its clamped margin an anatomes;

nular series oi.' holes 30. The disc 28 is lof less diameter than the disc 21 and is disposed outwards of the latter. It is of-slightly less diameter than the adjacent portion of the inner periphery of the tubular tip 9 and has an annular series of holes 3|. Said holes are angularly offset with respect to the holes 3U in the disc 21 in order that they are not in registry with such holes. The stem 29 is formed integrally with, and exltends between the central portions of, the two discs 21 and 28, and serves to hold the latter in offset or rigid laterally spaced relation. In connection with operation of the pilot burner the combustible mixture of gas and air under pressure, after travelling or flowing through the flared throat i4, passes first through the holes 30 in the disc 21 and then through the space between the two discs. After passing through such space a portion of' the mixture flows through the holes 3| in the disc 28 and the balance flows around the said disc 28. During flow of the mixture past the baffle unit i0 the velocity of the mixture is reduced to such an extent that the mixture burns within the outer end of the tubular tip 9, as hereinbefore described. Preferably there are four holes in the disc 21 and four holes in the disc 28 and the holes in the disc 21 are arranged 90 apart and the holes in the disc 28 are arranged19|l apart and are positioned 45- from the holes 30. in the disc 21; 4The total area of the holes in each disc ofthebaiile unit is materially less than the area.` ofY the discharge end of the flared throat I4: in the tubular body 1. Because of the design and construction ofthe. pilot burner the latter is capable of-v burning any gas of high calorific value without likelihood of the `flame emanating from the tip being extinguished by a draft or unusual exterior air currents.

The mounting bracket 6 is preferably in the form of a one-piece metallic castingand is located at one side of the central portion of the tube b of the main gas4 burner B. It is I-shaped so far as general contour or configuration is concerned and comprises a vertically extending intermediate piece 32, an elongated horizontally extending upper crosspiece 33. and an elongated horizontally extending lower crosspiece 34. The upper end of the vertically extending intermediate piece 32 is provided with a cylindrical part 35 having a smooth centrally disposed longitudinally extending bore 36. The tip 9 of the pilot burner fits slidably within the bore 36 and is releasably secured in place by means of a set screw 31 which extends through a screw threaded hole in the outer side portion of the cylindrical part 35. The pilot burner is arranged so4 that the tubular tip 9 thereof is disposed within the cooling well support S. The bore 3S in the cylindrical part 35 on the upper end of the intermediate piece 32 of the mounting bracket is so canted or angularly arranged that when the pilot burner is in assembled relation with the mounting bracket the axis of the tubular tip 9 is substantially in alignment with. the outer end of the angularly disposed orifice b4 in the upper portion of the discharge end of the tube b of thev main burner B and hence the flame emanating from the tip of the pilot burner is directed towards the orifice. The upper crosspiece 33 of the mounting bracket 6 is positioned adjacent the upper portion of the flange s2 of the cooling well support S end is secured thereto by way of a bolt 38, the shankofwhich extends through a horizontal slot 39 in the upper crosspiece, 33 and nts' within a threaded hole 40 in said upper por@ tion of the flange si. The lower crosspiece: 3l ofthe mounting bracket is positioned adjacent the lower portion ofthe flange s* and is secured in place by means of a bolt 4|, the shank of which extends through a horizontalA slot' 42 in the crosspiece 34 andE fits in' a threaded4 hole 43 in said lower portion of the flange s2. The

slots

39 and 42 permit themounting' bracket. to be adjusted laterally with respect to the tube b of the main burner B and also permit the bracket to be tilted about its center in either a clockwise or counterclockwise direction. The ends of the upper crosspiece 33 of the mounting bracket are provided with transversely extending set screws 44 and these abut againstl the upper portion of the fiange s2 of the cooling well support S and make it possible angularly or rotatively -to adjust the bracket about its longitudinal center or axis. When-lt is desired angularly or rotatlvely to adjust the bracket in one direction one of the set screws 44 is screwed forwards and the other set screw is screwed rearwards. Opposite or' re verse angular orv rotative adjustment of the bracket is effected by screwing the one set screw rearwards and the other set screw forwards. By adjusting the mounting brackets laterally by way of the slots 39 and: 42 and angularly or rotatively adjusting thebracket' by way of the set screws 44 the bracket-may be so' positioned that the axis of the tubular' tip 9. ofi the pilot burner isin coaxial alignment-orrelation withfthezangu larly disposed orifice b4.. in: the: upper portion or discharge end of the` tubeV b of the mainy gas burnerB. The central portion: or the vertically extending intermediateplece 32' of" the; mounting, bracket is provided withan integral laterally-ex tending lug 45 which fits within a notch 46 in the main burner tube b and serves tohold the main burner tube against rotation relatively to the bracket G and the cooling well support S while at the same time permitting the-bracket to be shifted to a limited extent to and from the tube andA also adjusted rotatively about its longitudinal center.v

When it is desired to mount the pilot-burner with respect to the main burner B thetip 9 is inserted through the. bore 36 in the cylindrical part 35 at the upper end of the vertically extending intermediate-.piece 32 of the mounting bracket 6 and is secured in place by tightening the set screw 31. Thereafter the bracket with the pilot burner connected thereto is positioned alongside of the central portion of the,l main burner tube b and is shifted laterally in order to bring the laterally extending lug 45 into interiltting relation with the notch 46. After so positioning the bracket thev bolts 38 and 4| are inserted throughv the

slots

33 and 42 and are screwed part way into'their re spective threaded holes 40 and 43 in the flange. s2 of the cooling well supports. After-such operation the bracket is adjusted laterally and tilted to the proper extent and then is angularly or rotatively adjustedabout its center by adjustment of the set screws 44. When theV bracket is so positionedl that it serves to hold the pilot burner in such position that the axis of the tubular tip 9' is in coaxial alignment with the ori# fice b4 the bolts 38 and 4| are tightened to the fullest extent.

When it is desiredto operate the main gas burner B the pilot burner is lighted byfirst open ing the shut-offl cocks 2| and 2i.'l and then plac ing a lighted matchr adjacent the discharge end of the tubulartip 9. As soon as thel pilot burner is ignited or lighted it produces a name which is directed into the angularly disposed orifice l1* in the' discharge end of the main burner tube 1b. Upon supply of a mixture of gas and air under pressure to the main burner tube the mixture is ignited in the dared discharge end of the throat b3 of the main burner tube by the flame which enters the main burner tube via the orice b4.

The herein described pilot burner mount effece tively and eiilciently fullls its intended purpose and, due to its design and construction, may be manufactured or produced at a low cost.

The invention is not to be understood as restricted to the details set forth since these may be modified within the scope of the appended claims without departing from' the spirit and scope of the invention.

This application is a division of our pending United States application Serial No. 596,632 led May 30, 1945 and entitled Pilot burner.

Having thus described the invention what we claim as new and desire to secure by Letters Patent is:

1. In combination with an apertured support and an elongated main gas burner tube having one end thereof extending through the aperture in the support and provided with an exposed open ended orifice that extends through, and at an acute angle to theaxis of, the tube, a mount and pilot burner assembly comprising an elongated one-piece bracket positioned adjacent the other end of, and extending transversely with respect to, the tube, having the ends thereof connected to the support, and embodying inwards of one of its ends a rigid integrally formed tubu-` lar member having a smooth bore, provided with a transversely extending set screw, and disposed at substantially the same angle as, and in substantially coaxial alignment with, said orifice, and a pilot burner positioned alongside of said other end of the tube and embodying a substantially straight tubular body provided at one end thereof with means for supplying it with a combustible gaseous mixture and having its other end tting slidably within said tubular member and secured in place by said set screw.

2. In combination with an apertured support and an elongated main gas burner tube having one end thereof extending throughthe aperture in the support and provided with an exposed open-ended orifice that extends through, and at an acute angle to the axis of, the tube, a mount and pilot burner assembly comprising a one-piece I-shaped bracket positioned adjacent the other end of, and extending transversely with respect to, the tube, having its end parts fitting against the support and provided in their intermediate portions with longitudinally extending slots, and embodying inwards of one of its end parts an integral tubular member having a smooth bore, provided with a transverse set screw, and disposed at substantially the same acute angle as, and in substantially coaxial alignment with, said orifice, attaching bolts extending through the slots and into the support and forming with said slots connections for permitting lateral adjustment of the bracket relatively to the tube, and a pilot burner positioned alongside of said other end of the tube and embodying a substantially straight tubular body provided at one end thereof with means for supplying it with a combustible gaseous mixture and having its other end tting slidably within said tubular member and secured in place by said set screw.

3. In combination with an apertured support andan elongated main gas burner tube having one end thereof` extending through the aperture in the support and provided with an exposed open ended orice that' extends through, and at an acute angle to the axis of, the tube, a mount and pilot burner assembly comprising a onepiece I-shapedbracket positioned adjacent the other end .-of, land extending transversely with respect to, the tube, having its end parts fitting against the support and provided in their intermediate portions with longitudinally extending slots, and embodying inwards of one of its end parts an integral tubular member disposed at substantially the same acute angle as, and in substantially coaxial alignment with, said oriiice, attaching bolts extending through the slots and into the support and forming with said slots connections for permitting lateral adjustment of the bracket relatively to the tube, set screws extending transversely through the end portions of one of the end parts of the bracket and adapted when turned one relatively to the other after loosening of the ,bolts rotatably to adjust the bracket about its longitudinal center, and a pilot burner positioned alongside of said other end of the tube and embodying a substantially straight tubular body provided at one end thereof with means for supplying it with a combustible gaseous mixture and having its other end fitting and secured within said tubular member.

4. The combination with an apertured support, of an elongated main gas burner tube having one 'end thereof extending `through the aperture in the support and provided with. an exposed open ended orifice that'extends through, and at an acute angle to the axis of, the tube, an elongated one-piece bracket positioned adjacent the other end of, and extending transversely with respect to, the tube, having the ends thereof connected to the support, and embodying inwards of one of its ends a rigid integral tubular member disposed at substantially the same acute angle as, and in substantially coaxial alignment with, said orifice, a pilot burner positioned alongside of said other end of the tube and embodying a substantially straight tubular body provided at one end thereof with means for supplying it with a combustible gaseous mixture and having its other end fitting and secured within said tubular member, and an intertting lug and notch connection extending between 'the intermediate part of `the bracket and the adjacent portion of the burner tube and operative to prevent rotation of the tube relatively to said bracket and support.

5.` The combination with an apertured support, of an elongated main gas burner tube having one end thereof extending through the aperture in the support and provided with an exposed open ended orifice that extends through, and at an acute angle to the axis ofthe tube, a one-piece I-shaped bracket positioned adjacent the other end of, and extending transversely with respect to, the tube, having its end parts fitting against the support and provided in their intermediate portions with longitudinally extending slots, and embodying inwards of one of its end parts an integral tubular member disposed at substantially the same acute angle as, and in substantially coaxial alignment with, said orifice, attaching bolts extending through the slots and into the support and forming with said slots connections for permitting lateral adjustment of the bracket relatively to the tube, set screws extending transversely through the. end portions of one of the end parts of the bracket and adapted when 9 turned one relatively to the other after loosening of the bolts rotatably to adjust the bracket about its longitudinal `jcenter, and a pilot burner p0- 'si'tioned alongside of said other end of the time and embodying a. substantially straight tubular body provided at' one end thereof with meansn lfor supplying it witha combustible gaseous mixture 'and having its other end tting and secured with- 10 parts of the bracket and a lug-receiving notch in the adjacent portion of said tube. KURT A. SCHAREAU.

ALBERT STADLER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,659,404 Lipschutz Feb. 14:, 1928 2,241,583 Campbell May 13, 1941 2,249,331 Sachs July 15, 1941