US1918363A - Boiler mud ring structure - Google Patents

Description

July 18, 1933. G, w 1,918,363

BOILER MUD RING STRUCTURE Filed D80. 23, 1931 A3 5 pqso 0 Q o @{0 Q o OOOOOOv L -FlG.3.- 24

0 9 0 0 0 0 o o o 0 1) 0 o o o INVENTOR George M Wilson,

JUT RNEY Patented July 18, a

enonenm. w ILson, dru mers, NEW Yonx 30mm m ;ms 1 screwing-i;

" Application fi1ed December 23,1931i Seriall No.f582,7l2. 1

This invention relates to steam boilers and particularly to the bottom ring commonly called. the mud ring which holds the inner and outer fire-box sheets in spaced relation.

The objectf'ofsthe present invention is to' provide anv-improved boilermud' ring structure, which will be characterized by strength anddurability making for increased longev ity of service, relativelightness in weight,and being economical to construct, while at the same time'being of sufiicient flexibility-"in combination with its stre'ngthto meet all the requirements of service."

Mud rings of rectangular cross section'to which the fire-box sheets are attachedjby rivetspassed through thesheets and the ring,

, have been employed in common practice,and

i' cracks to formv between the rivet holes in the in recent constructions the bottom edges of the sheetshave been welded to the rings to increase the tightness of the joints. Prolonged service, however, frequently causes the rivets ofsuch structures to loosen and'cause mud ring and the sheets. 'The'necessary repairs, because of these defects, are costly in both time and labor. Such loosening and cracking especially when nearthe corners of the structure, if not properly repaired, results in erosion of the scarred edges of the sheets to the extent] of requiring their replacement sooner than would otherwise be necessary.

The present. invention a provides 1 a I structure" wherein the rivets formerly employed for the attachment of the sheets tohthe rin are entirely jeliminatedtogether with the objectionable results caused thereby. -"This structure comprises a ring of considerably reduced weight, which ring is ,of ampl'em strength to withstand all of the stresses imposed upon it byreason of the boiler pressure on the inside and by reason'of the shocks and;

vibrations of the frame structure of the'locomotive, which are commonly met with in everyday practice. Further, the structure is characterized by a, certain flexibility enabling it to adjust itself to irregular expanding and contracting movements of the boiler caused by differences and changes in temperature.

Referring to the drawing, wherein there is illustrated a specific embodiment of'the present plug in position. I v i I i Referring indeta'il to thezdrawing the cut invention, and wherein like'freference characters on the sev'eralfigures indicate like parts, Fig: 1 is a horizontal'sectional view of' a partof the mud ring structure of the instant invention, taken on the line I 1' of Fig. 2;

Fig.'-2 is a fragmentary section taken onthe line IIII ofFig: 1; Fig. 3'is an'endview in elevation of a partofthe structure-illustrated'in Fig. 1;Fig. t is' asection-on an en'- larged-scaleof the inud ring, taken onth e li'ne IV-IV ofFig. 3';and Fig.- 5. is a section on an enlarged "scale of the mud ring taken on the line V--Vjof Fig. 1 showing the wash- 3 structure embodying the instant invention comprisesa closed rectangular mud ring 1, Q having a bottom portion 2, and: two up i wardly extendingouter and inner sidewalls, 3, and 4, respectivelyii vThe ring *is "thus "of hollow, upstandingu U-shaped construction. Theupwardly extending outer and inner side walls 3 and4,are of reducedthickness at their lupper portions" 5. and 6 :providingledges 7 and 8," anda plurality of threaded bolt holes.

9 arelformed in the upper portionso and 16 of the walls-aroundtheentire ring, the holes of theouterwallbeing oppositely disposed with relation to or alignedwiththeholes. of: the

inner wall- The upperedges of the walls 5 are bevelledatoa and 6a,.to1avoid thelodge- "ment of sediment thereon,whenlthe bOilOILlS in operation, with theboilersheets assembled with thering ashereinaftendescribed; I- Outer fire-boxsheets 1O -v extend upwardly from. the, mud ringwith their lower, ends 7 "adjacent theoute'r'sidesi of the upper portion f the mud ring wall 3, and with theiredges v acenti the ledge 7, vso that the outer surfacesoftheinud ring ana thejouter fire-box! sheets are flush with eachother}. ASi-miIarIy,

inner.v fire-box; sheets -11 "extend upwardly fromathe, mud ring with their lower' ends adjacent the outer surfaceofthe upperpor:

tion} 6 .and (their -.lower edges adjacent the ledge 8 of the mud ringwa'll 4, the outersurfaces of the inner fire-box sheet 11- being flush with the outersurface ofthevmud'ring wall .4.) Bolt holes 12 are formed in the fire-box sheets opposite to i or in I alignment with the holes 9 in the mud ring andstaybolts are passed through the holes of the sheets and of the mud ring walls, and secure the sheets to the ring. The staybolts'l3 are threaded and engage the threaded bolt holes 9, and the extremities of the staybolts are headed over at the outer sides of the sheets. The lower edges of the sheets, adjacent the ledges? and 8 are welded to the mud ring as indicated at 14, the weld deposit filling the space therebetween and providing additional securing means between the sheets and the ring, and making for increased strength and tightness of the jointure. The fire-boxsheets are made 7 in sections in theusual manner and overlap" at their meeting edges, and are riveted together in the usual manner at such edges, as

- indicated at 15. Thebottom portion-of these connecting edges, however, are cut awayat .the portions where they would otherwise overlap,"as indicated at 16, so as to evenly meet and present a continuous even surface at theiportion of the sheets connected with 1 the mud ring. Rivets 17- are provided at, the

corner portions of the sheet securing said portions ,to themud ring to assistithe corner staybolts, so as to strengthen the same, and

the adjacentedges ofthe sheets at the cut away. portionsare weldedas indicated at 18,

;to insure a sturdy and'steani-tight connection. By this means, the 'jointure of the section of sheet of one side of the ring with the section of sheet of adjacent side is accomplished. v r I j .The mud ring is provided with wash-out openings--19 atits corners. Thesopenings slant downwardly andoutwardly from the i bottom-of the ring the outer surface-of the ring around the periphery of these. openings being -formed as a collar or-boss,:as indicated at :20 and'the interior of the openings being threaded, as indicated at 21,1forthe reception of wash-out plugs 22 which arecorrespondingly threaded at23 andyadaptedto betightly screwed into said openings. By thus pro-,

viding thewa'sheout openings at the corners of the ring slanting downwardly from the bottomthereof, as distinguishedr from the usual practice wherethe openings are located parallel to the bottom of the ring in the side thereof, an easiei ouhflow of water is pro- 'vid'ed'. integrally 'formed on thebottom' of the mud ring areverticalflanges 24 provided with bolt holes 25 forattachingand supporting the boiler,-in'the usual 'manner, tovthe frame of the locomotive. r

1 By the foregoing construction will'be I seen that there is provided a structurelof sub-' stantially reduced weight, which issufliciently'sturdy and embodies the character istic of flexibility, so as to enable it to adjust itself to irregular expansion and contraction movements of the boiler due tov differences and changes in temperature, while at all times maintaining the oints steam-tight and withstanding all stresses imposedupon them by reason of boiler pressurelbetween the sheets,

and the shocks and vibrations of the frame structure of the locomotive which .are common to everyday practice. The structure is further characterized by its simplicity,

cost. e I

'VVhile there has been herein described a specific embodiment of the instant invention easiness of assemblyfand' therelatively low it will be understood that many and various changes andfl modifications may be made thereto without departing from the spirit of theinvention, and that all and any such changes and modifications as falli withinthe scopeof the appended elaim are contemplated as a part of the present inventioir' I The invention claimedand desired ,to be secured by Letters Patent is: I In a locomotiveboiler,,the combination of a mud ring comprising integrally formed U- shaped members extending along opposite sides of the boiler fire box, each member havinga base and two spaced walls united with and extending upwardly from the base-providing therewith a channel open atethe'top,

said spaced walls eachhaving longitudinal f row of-spa'ced threaded orifices nearits upper edge, the orifices on one side being aligned with the orifices on'the opposite'sideprovid' ing pairs, and. said members having thick"- ened portions on-each side begi-nningata point between the row of'orificesand the bote, tom of saidcha'nnel and extending'below the bottom of said channel, to reinforcexthe union between saidbase and said walls, each of said thickened portions forming, a shoulder with the-adjacent upwardlyextending pore tion of the wall; a boiler plateadjacent the eXterior-face'of each of said-upwardly ex tending portions ,andfhaving perforations registering- With said. threaded orifices and ha'ving'a lower edge spaced above'the adjacent shoulder, said edge beingwelded toe-aid fl

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