US907841A - Construction of steam-boilers. - Google Patents

Description

A. W. METGALFE & J. S. D. SHANKS.

CONSTRUCTION OF STEAM BOILERS.

Anmou'lou 1-11.21) 1113.18. 1905.

907,841 Patented Dec. 29, 1908.

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1 MM' afM A. W. ME'I'GALFE & J. S'. D. SHARKS. UONSTRUGTION OF'STEAM BOILERS. APPLIOATION FILED PEBTIB, 1905.

907,841 Patented Dec. 29, 1908.

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GONSTRUOTION 0P STEAM BOILERS. APPLICATIOK FILED IEBI. 18, 1906.

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WITNESSES.

A. W. METOALFE & J. s. .D. SHANKS. UONSTRUG'IION OF STEAM BOILERS. APFLIOATIOH FILED FEB. 13, 1905.

907,841 i I I v Patented Dec. 29, 1908.

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UNITEDHSTATES ARTHUR W. METcALFEnND ioHN 'sT EL ixon siiiinxs, on 'BELFAsT', iRELAnn. i

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Be it known that we,'"ARTH R WILSON METOALFE and JOHN STEEL DIXONQSHANKS, British subjects. and residents of Belfast,

county of Antrim, Ireland, have invented certain new and useful Improvements in the construction of Steam-Boilers} of which the following is aspecification. X

This invention relates to tubular "boilersthe expansion and contraction of'the tubes.

Our invention consists'essentially in constructing the tubes in sets or groups or nests' o fitted into suitable coupling'plates'at both ends by which they are fitted to =the' boiler plates each unit so constructed containing any desired number of tubes sayfroni 12 up to 100 more or less according to thesize of 5 the boiler and the'size of the units orsets of tubes.

The invention will be fully describedwith reference to the accompanying'drawings in which as examples theinventionis shown applied to various descriptions of boilers some of which have been specially designed for the purpose. I

Figure 1 is a sectional elevationof a vertical boiler showing the invention "applied 5 thereto. Fig. 2 is a sectional plan of same.

Fig. 3 is a sectional elevation of special; design of vertical boiler with the nests or units of tubes applied thereto. -Fig.f4 is a sectional plan of same showingthe positionof the nests of tubes. Fig. 5 is a sectional elevation of one unit or set of tubes with the coupling for fastening same into the' plates of the boiler. Fig. 6 is a half plan of the coupling plate into which the set or nest of tubes is fixed. Fig. 7 is a sectional elevation of one unit or set of tubes showing a modified construction of cou ling plates. Fig. 8 is a half plan of same. ig. 9 is an elevation of water tube boiler constructed with units of tubes within larger water tubes. Fig. 10 is an end elevation of same showing spacing of tubes and units. Fig. 11 is a sectional elevation of special design of locomotive boiler constructed with both horizontal and vertical nests of tubes. Fig. 12 is a half end 'Speeificati on'of pette'i-cs at aaf? meatede eefleosf; Application fl ledlebruary 18, 1905.; Serial 4 NB. 246,348. I

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- "lheinvention"may1beappliedto any ordinary formof tubular-or water tube boilers either vertical or horizontalthe tubes being f grouped together in nests or sets D the ends being fitted into coupling plates A to attach themto the plates of the boiler each nest or 'set forminga unit ofjtubes D which can be handled and-'easily and readily placed in position orremoved therefrom. E 1

The coupling plate A is preferably in the form of-adish-shaped metallic casting or forging into which the 'tubes-aresecured'in any ordinary way by "drifting or expanding" 1 by screwingor by nuts or in anyother -manner'. 'lhe inner wall jw' is chased or screwedto receive an annular nut' B (see "Fig. 5) and the outer edge a/ is beveledas is also the edge of the annular nut. 1 steam and water tight joint "between the coupling plates A- and a corresponding hole in'the boiler plates A is obtained by a metallic or otherpacking ring G placed in the-hole in the boiler plateand 'interposed between the conical orbeveled edge at of the coupling plate and the beveled or conical edge b] of the annular-nutB. I:

{- The metallic packing ring is preferably soft copper andwhen the annular nutBis" *screwed into the. couplingflplateA the ring C isfexpanded between the two beveled faces 3 making "steam or water tight 1 joint with the hole in'the plate'A"; Thepacking ring G can move in the hole in the plate A asthetubes D contractor expand.

To insert and'fix the unit of tubes inpo- *sition the hole in one plate A"is preferably Y made larger than that the other and one coupling A'is' made. with a shoulder to rest against the plate and the nut is also 5 madefwith ashoulder to limitth'e movement at the tubes. If desired both nuts- B may *have'a shoulder suchas b. r The coupling is passed through the larger hole and secured in the smaller one with the shoulder a resting against the lat-e and the other coupling is then secured in the hole in the other plate through which it has passed by screwing the nut B down u on the packing ring 0.

In a modi' cation shown in Fig. 7, the dished coupling plate A at one end of the unit of tubes D is drawn down onto a soft .metallic packing ring 0 by the annular nut formed with a shoulder or head 12 which rests against the plate A, and coupling plate A at the other end is provided with screwed studs or bolts a by which a metallic packing ring C is clamped between it and a plate or cover A and expanded against the sides of the hole in the plate A. It will be evident that the soft metallic packing ring C may be clamped and expanded between the coupling plate A and the sides of the hole in the plate by any other suitable means.

Referring to I igs. 1 and 2 the unit of tubes D are shown attached by the coupling plates A to the top and bottom horizontal plates A of a cylindrical vertical multitubular boiler. The horizontal plates A are riveted to the cylinder at the top and bottom and are supported by stays or stay tubes E of ordinary construction expanded into or otherwise attached to the plates. A fire grate L is placed below the boiler as described and a smoke box may be placed above the tubes.

Referring to Figs. 3 and 4 another special construction of boiler is shown for utilizing the units or nests of tubes D. Two headers or chambers H are placed horizontally one above the other and connected together by the large tubes F through which the units of tubes D pass and secured to the outer plates A of the headers by coupling plates A as hereinbefore described. Stay tubes E expanded into the plates A of the headers support them in position. Water tanks J may be connected with the lower header through which the feed water passes.

Referring to Figs. 9 and 10 another special construction of boiler is shown for utilizing the units or nests of tubes D. Two chambers or headers H are constructed connected by the large tubes F secured in the plates in any ordinary way. Through the headers or chambers H and the larger tubes F the units or nests of small tubes D are passed and secured as hereinbefore de scribed to the outer plates of the headers H. The headers H are connected to a steam and water tight chamber H placed above them. The headers H may be vertical with horizontal tubes or they may be horizontal with vertical tubes or at any other inclination.

In either of the special designs of boilers described the boiler may rest upon steel tanks forming two or more sides of the furnace and the feed water may be first injected into the tanks and from thence to the boilers by one or more tubes.

Referring to Figs. 11, 12 and 13 a special construction of locomotive boiler is shown having horizontal and vertical tubes. The shell A is horizontal and of oblong form. The shell is fitted in with units or nests of tubes D placed vertically and in the lire box are two headers H with units of tubes D placed horizontally passing through large tubes F. The units of tubes D are secured in position by coupling plates A as hereinbcfore described. The furnace P in this boiler is placed at one end of shell and depending from the roof of furnace are the two headers H having tubes extending from the one to the other. The heat and gases of combustion in these boilers, where the large tube system is used, by passing through the stay tubes which are surrounded by water, and surrounding the large tubes which contain water, and passing directly through the inclosed small tubes which are like the stay tubes also surrounded by water are presented to a large heating surface in a comparatively small space and very rapid evaporation is the result.

What we claim as our invention and desire to protect by Letters Patent is:-

1. In a steam boiler the combination with a unit comprising a plurality of tubes of a dished coupling plate A at each end to which the tubes are secured, a loose coupling ring B by which the coupling plate is drawn into position and a soft metallic ring C compressed between the two substantially described.

2. In a steam boiler the combination with a unit comprising a number of tubes D, of a dished coupling plate A at each end in which the ends of the tubes are secured provided with an internal screw thread, an annular nut B to engage the said screw to draw the coupling plate into position and a soft inetallic packing ring C to form a oint between. the two parts substantially as described.

In witness whereof, we have hereunto signed our names in the presence of two subscribing witnesses.

All'lllUll W. METCALFE.

.l OllN STEEL DIXON SlHNhS.

Witnesses JOHN Moons, THOMAS DIXON.

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