US1688594A - Locomotive boiler - Google Patents

Description

Oct. 23, 1928. v 1,688,594

J. l.. NxcHoLsoN LocomTIvE BOILER I Filed July 14, 1924 2 Sheets-Sheet 2 A 50 These objects o others, to ether with the many advantages Patented Oct. 1 92'8.

come 1..-mcnonson, or cmcaeo, :LLLmoIsf-As'srcnon Locoxorlvn xu' comm, or emesso, :LLINoIs--A conromrron' or nnnapwman.l

' Loconrrvn norma.' i i A apn-auna ined July 14 In some locomotive boilers having fireboxes of the combustion chamber type, the' height of the throat sheet is, indeed, limited andrestricted by various boiler conditions so that it is quiteshallow.- Great diiiculty` is presented'under suchjconditions to the instalf lation of water circulating'v elementsl in the frebox [which connect the saidthroat' sheet,-

with the crown sheet.`

It is one ofthe objects of llg. resenty invenfV tion to so construct the throat-s ietland bot# tom wall ofthe combustion chamber, that theA inlet end of-said circulatin element or -ele ments maybe operatively nnected --thereto and to the crown sheet ina manner which permits spacing of said inlet endra sufficient dis'- tance above the 'atebars, 4and at the same time provide a ont water leg, amply able to meet the 'demands of the' inlet endof said-J circulating element. i l A further obj ect of the -invention is to pro.

vide an improved construction of watercir# culatin 3o stricte inlet areawhich opens into the lower t water leg at the junction of the innerl throat. sheet and bottomv wall of the combustion chamber'and having a discharge mouth of a relatively large area which opens through the crown sheet of t-hefboiler.4 A further object of theI invention isto' imrove the construction of the'water circulatlng element which is in the form of an .in-;

- verted substantially triangular andat body 40 connected`l at Aits base to the crown sheet' and at its apex by a. tubular neck withthe junction of the inner throat sheet andbottom wal] of the combustion`chamber, and to so arrange the front edge or wall of said bodythat it is inclined upwardl andrearwardl from said ineck, thuspermi ing a certain exibilityjof these parts which eliminates buckling or otherundue stresses in the expansion or contraction` thereof undertemperaturef changes.

the invention, asv wellas with my specification, l

A thereof will more Afully appear' as Iv proceed through the firebox in a plane indicated by the l1ne 22 of Fig. 1.A

element having:- a somewhat re area less than that ofthe firebox, and its bot- 'tom wall 9 is inclined upwardly a.x1d "rearl thereof'where itl is more gradual because of throat'sheet 5 and the bottom wallv 9'of the im. sendit-no. umu.'

Fig. l'is a. vertical longitudinal'section 66 throu hthe freboxV end of a locomotive boiler embo ymgmy invention. f j v Fig. 2 -1s atransverse' vertical section The invention'is herein illustrated and will 4 -be herein described as-embodied in a'locomotive boilerhawingr a fire box of the combus- 'i t1on` chamber type but," as is'apparent, the

invention is not to be Alimited thereto as it v mayubeembodied in' locomotive ireboxes -of other types, where 1ts peculiar characteristica make 1t advantageous to do so. v

- Referringnow detail to'the locomotive 'boiler irebox illustrated herein,the same has 70 'a fire chamber which extends from the back sheet l1-to the ,flue sheet` 2, and 'from one tothe other of the sidesheets 343, with a grate 'or bottom 4.A Said grate', "as herein shown, A

extends from the back -sheet to an inner throat '75 sheet 5Iwh1eh 1s vspaced rearwardly from the lue `sheet'.A The top of the irebor is formed byu-a crownsheet 6 vhich Vextends from the.

back sheet to the ilu sheetandbetween said flue sheet andthe Luger throat sheet is' provided a combustion c amber 7 having its to formed by the crown sheet, its sides 8 form' by endparts or continuationsof kthe side' sheets and 4having. its bottom formed byl a transversely and upwardly 'curved bottom. wall- 9 which merges into the 'side walls of said combustion chamber and. extends from the flue sheet to the inner throatsheet.' Said combustion chamber' is of a cross sectional wardly.. from the flue sheet, said inclination being more pronounced on the lon 'tudinal I median line of the'boiler, than-on either side" 96 the mergingl ofthe -transvers'elyycurved bottom'w'all into the curved side wall parts'of said combustion chamber.

-At 'the junction or meeting ofthe inner combustion chamber '7, finfthe longitudinal median lane oftheboiler is provided an annular ange orf collarz 10 arranged with lits` axial plane. extending upwardly 'and rearwardly, said annular lange being connected 10's to. said innerthroat sheet and lsaid-bottoni vwall by-an annular corrugation 11 which per-4 mits =ofa expansionandc xintractiox 1,4 i 7 of said flange or collar under temperature changes in the rebox. Spaced a suitable v distance on each side of said annular flange is va similar 'annular ange or collar 10-.10, the number of such collars and the lateral spacing thereof, of course,l being dependent upon the size or width of the irebox.

In the rear sheet 1 is provided the usual fuel door opening 12 'and to the front or flue sheet 2 are connected the usual flues 13 through which the products of combustionl are drawn by the exhaust nozzle (not shown) y in the manner well known. The irebox is enclosed by a top plate 14 and side plates 15-15,' the outside throat plate 16 and' back plate 17 ,t which provides i the wrapper therefor. lSaid plates, together with the fire sheets or walls of the iireboX,

define the `several water legs of the boiler, namely, the front'leg, or throat, 18, the side legs 19-19 and theY back water leg 20, all closed at the bottom by the usual mud ring, as

shown. .Y The inner sheets of the iirebox including the crown sheet are joined to or stayed from the outer sheets of the iirebox by means of the staybolts 21.

In the embodiment of the invention herein shown, it will be apparent that the irebox contains a plurality of substantially triangu lar hollow elements 22, 23 and 24, respectively which conduct water vfrom the-front leg 18 ofthe boiler to the space'above the crown sheet 6. Three ofsuch elements are shown l herein, but this number of elements is to be Each water circulating element, preferably` includes an upwardly and rearwardly. 'in- A- clined tubular neck or bottom 25` and' a pro- 26. The lower part ofl the -bottomlportion `is a closed tube and constitutes the neck or inlet portion 27 of the element which is in open and unobstructed communication with the water space or leg18 below theiiues 13.'

As shownherein, the extreme end of said neck portion is/seated withirrone of the flanges 10-'-10. and is preferably welded thereto. vThe portions 25 and 26 merge into long slot-like passageways 28(see Fig. 2)

fwhlch rev 'ster with openings in the crown sheet Vto l. ave unobstructed communication` with the boiler s ace above .the .crown sheet. The water may ow and rise freely from the' bottom of the boiler, which includes the leg -gressively upwardly enlarging body portion 18, into the water circulating element where itis rapidly heated and rises therein to be discharged,y above the crown sheet.

The circulating element thus far described is substantially the same in construction and operation as that shown in and termed a thermic Siphon in Patent #1,337,720, to John L. Nicholson issued on April 20, 1920. As described in said patent, the circulating element is made of a single piece of sheet' metal folded upon itself to providethe neck 27 as well as the flared body portion 26 which has an outwardly extending 'flange 29 lat its top.- Said lian e is preferably welded to the crown sheet a out the elongated openings therein which registers with the space 28, before referred to. Said space is defined by 'parallel side walls 30-30 which are joined together at their forward ends to provide a rounded end wall 31. This rounded end wall is inclined upwardly and rearwardly from the vertical plane of the point of its connection with the neck 27. Said inclination of said end wall is important because it permits of more flexibility of the siphonic` element undeiT temperature changes so that itreadily accommodates itself'to contraction and eX-v pansionwwithout buckling, splitting or cracking which, of course, would be indeed'serious. Internal strains ork stresses in said elements are ablyI resisted rby connecting or staying the side walls of saidA elements together byl means of the stay bolts 32.

Under operating conditions induced by a' fire in the firebox, a vigorous flow of water from the lower art of the boiler and upward through the fireEox is rovided with a copious rapid and widely water and steam into the space above and on top of the crown sheet of the boiler.

vMy improved construction has many advantages. The inlet end of the thermic siphonic element is connected to the innerA throat sheet without placing it soy low as to engage the fire bed on the grate bars which, ofcourse, would be objectlonablein that it would interfere with the combustion and might kcause burning out of said element at the inlet end thereof. Furthermore the front water leg capacity is increased without material change in the boiler shell orin the bottom wall of the combustion chamber so that the lsupply of water for the inlet end of the cir# culating elements is always adequate. I

- The advantages of the above mentioned construction are, no doubt, apparent to those skilled in the art. In describing the invention, I have referred to certain details of construction, as well asf'orm and arrangement of parts, but itis to be understood that I do not wish to be limited theretoexcept 'as may be pointed out in the appended claims.

I claim:

with one or-more-hollow substantially verstributed delivery of' 1. Al locomotive rebox, in combinationtical and trian lar water circulating elements therein, t e top of each element open-l ing through the crown sheet into the space above the same, each element having an intake throat at its lower end through whichcommunication is established with the bottom of the boiler, said element including a front wall which is inclined upwardl and rearwardly from the connection of said wall with the intake throat.

2. A locomotive irebox` having a combustion chamber at its forward end and a throat at the-rear end of said combustion chamber, in combination with one or more substantially vertical and triangular water circulating elements therein, the top of each element opening through the crown sheet into the space above the same, each element having an intake neck at its lower end which is connected to said throat, said element including a front wall whichis inclined upwardly and rearwardly :from the vvertical plane of the connection of said front wall with said neck.

3. A locomotive rebox comprising a rear fire bed chamber and a front combustion chamber, the bottom wall of which is inclined upwardly and rearwardly to meet the throat sheet at the forward end of said fire bed chamber, means providing a plurality of laterally spaced annular flanges at the meeting arts of said bottom wall and throat sheet, la p urality of hollow substantially vertical and triangular water circulating elements each having a tubular neck portion at its lower end operatively connected to one of said anges, the other or top ends of said circulating elements being elongated in the longitudinal vplane of the rebox and o ening through the crown sheet to provi e a water circulation between the bottom and top parts of the boiler.

4. A locomotive irebox comprising a rear lire bed chamber and a front combustion chamber, the bottom wall of which is'inclined upwardlyT and rearwardly to meet the throat sheet at the forward end of said fire bed chamber, means providing a plurality of laterally A spaced annular flanges at the meeting parts of said bottom Wall and throat sheet, a plurality of hollow substantially Vertical and triangular water circulating elements each having a tubular neck portion at its lower end operatively connected to one of said flanges, the other or top ends of said circulating elements being elongated in the longitudinal plane of the irebox and openin through the crown sheet to provide a water circulation between the bottom and top parts of the boiler, said elementsV each including a front wall which is inclined upwardly and rearwardly from the vertical plane of the connection of said wall with said tubular/neck portion.

In testimony whereof, I have hereunto set my hand,this 8th day of July, 1924.

JOHN L. NICHOLSON. y

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