US997440A - Steam-boiler superheater. - Google Patents

Description

W. DALTON.

STEAM BOILER SUPBRHBATER.

APPLIGATIUN FILED JAN.13,1911. 9973440 Patented July 11, 1911 5 SHEETS-SHEET 1.

WITNESSES INVENTOR Patented July 11, 1911.

5 HEETSSHBET 2 INVENTOR M W. DALTON.

STEAM BOILER SUPERHEATER.

APPLICATlON FILED 171111.13

Patented July 11, 1911.

5 SHEETS-SHEET 41 FlG-4-.-

WVENTOR WITNESSE W. DALTON. STEAM BOILER SUPBRHEATBR.

APPLICATION FILED 1111.13, 1911.

5 EHEHTBSHEET 5.

Patented July 11,1911

I W M M l l l i M 1 2 n F r e G r m.

WILLIAM DALTON, 0F SCHENECTADY, NEW YORK.

STEAM-BOILER SUPER-HEATER.

Specification of Letters Patent.

Application filed Jan aary 13, 1911.

Patented July 11, 1911. Serial No. 602,445. Y

To all whom it'may concern:

Be it known that I, WILLIAM. DALTON, of Schneclady, in the county of Schenectady and State of New York, have invented a certain new and useful Improvement in Steam-Boiler Superheaters, of which improvement the following is a specification.

My invention more particularly relates to steam boiler super-heaters of the lire tube type, and its object is to rovide means for connecting the pipes within which the steam is superheated, with the saturated steam supply and superheated steam delivery pipes, which shal be simple and inexpensive structurally, readily applicable in connection with other elements of superheaters of different. classes, and exempt from the structural and operative objections which have been developed in headers of various constructions heretofore (assayed in practical service.

The improvement claimed is hereinafter fully set forth.

In the accompanyin drawings: Figure 1 is a vertical longitu inal central section through the forward portion of a locomotive boiler, illustrating an embodiment of my invention; Fig. 2, a horizontal section through the same, the upper half showing the members therein in plan, and the lower half being in sect-ion, on the line a a of Fig. 1; Fig. 3, a vertical transverse section, on thedine b b of Fig. 1, with the stack removed; Fig. 4, a half vertical transverse metion, on an enlarged scale, through the connection casing, on the line a c of Fig. 2; Fig. 5, a similar' section, showing a structural modification; Fig. 6 a partial vertical transverse section, on the same scale, through the connection casing and T head, on the line 03 d of Fig. 2; Fig. 7, a similar section, illustrating a structuralrmodificution; Fig.8, a partial transverse section, on a further enlarged scale, through the connection casin showing a modification of the manner 0% securing the sections thereof one to the other and to the diaphragm; Fig. 9, a similar section, showing the application of a non-conducting plate to the diaphragm; Fig. 10, a partialv horizontal section through the connection casing, on the line e e of Fig.

9; Fig. 11, a plan view of a collet or joint ring for seating a superheating pipe in a yoke; Fig. 12, a view, in elevation, of half of a collet, in position in a yoke; and Fig. 13, an enlarged sectional view, showing the connection between ,the superheater tubes and the casing.

My invention is herein exemplified in connection with a locomotive boiler, 4, having a plurality of fire tubes, 4. extending, in the usual manner. from a firebox at its rear end (which is not shown) to a smoke boir, 4", connected to its front end, and supported on cylinder saddles, 12. The products of combustion passing from the tubes to the smoke box are discharged therefrom through a stack, 4", having an inward extension or penetration, 4". Steam is supplied from the boiler through a main steam pipe or dry pipe, 61, and T head or brceehing pipe. $12, to branch steam pipes, 6 leading to ihe cylimlers, after passing through a superheatcr, comprising a plnrsliiy of loopsor return bends of supcrhcater pipes. 69, which are, in thb instance shown. lmullNl in superheating tubes, 67, of larger diameter than the majority of the boiler tubes and extending, in the usual manner, through the upper portion of the boiler, from the firebox flue sheet to the front flue sheet.

In superheaters as known and constructed prior to my invention, the pipes which supply saturated steam from the boiler, are ordinarily, if not invariably, connected to those which deliver superheated steam to the. cylinders, through the intcrmediation oi. socallcd headers, which are cast metal members, of various forms and locations, trans mitting steam from the supply pipes to the superheater pipes and from the superheater pi es to the delivery steam pipes.

llluclrdilliculty has been, and is now being experienced in practice with headers of present constructions. due partly to their comparatively large size and weight and the diiliculty of making and maintaining steam tight joints with them, and partly to the fact that it is difficult to obtain iron or steel castingswhich will effectively sustain the strains to which they are subjected in service. Mvinvention is designed to overcome this ditliculty by.the application of a connecting element of such material and structure as will exempt it, as for as practicable, from the objectionable action exerted'upon headers of the ordinary forms.

' In the practice of my invention, I provide for the performance of the functions of the headers of prior snperheaters, a connection casing, 70, which is a shell or box, composed of wrought plate metal, as steel or iron, of

.the character of ordinary boiler plate, and

' to the branch steam or delivery pipes, 63.

As shown in Figs. 1, 3, 4, and 9, each of the shell plates of the connection casing is dished or pressed into channel form in section, and is flanged outwardly on its periphery, and the two lates are secured tightly ,together, on opposite sides of the interposed diaphragm, 70, by riveting or welding.

In the form shown in lig. 5, only one of the shell plates is dished or bent into channel form in section and flanged, and the diaphragm is also dished or peri herally flanged and riveted or welded to it, after which it is similarly secured to the other shell plate which isflat throughout.

Fig. 8 shows the shell plates and diaphragm as united by welding, each of the shell plates being dished 'or pressed into channel form'in section, but none of the plates being peripherally flanged.

The/contour of the connection casing is dependent upon its location relatively to the breeching pipe, 62. and stack penetration,

- 4"; being of such form as to permit the casin to be roperly connected to the former an to afi brd suitable clearance from the latter. In the instance exemplified. in which the connection casing is located ln'u'izmn tally and abovc the tubes, its reu r and side walls are straight, and its front wall is centrally recessed suflicicntly to permit its peripheral flanges to clear the stack pentration, 4"". It will, however, be obvious that my invention is applicable, without variation of structural or operative principle, in superheaters of the type in wh1ch the supply and delivery steam pipes and superheating pipes are connectedto substantially vertical headers, of the smoke box, as in Letters Patent of the United States No. 875,895, granted and issued to F. J. Cole, under date of January '7, 1908. In such case, the connection casing would be changed in contour only, as required by its v tively to the breeching pipe and branch steam pi es, and the conse uent diflerent location 0 its connections with said members, but would conform in all essential structural articulars with that which is specifically erein shown and described.

The flat upper and lower walls of the connection casing are braced to resist the internal steam pressure acting thereon, by screw stays, tapped into the shell and diaof the brceching pipe,

located adjacent to the sides ifierence of position, rela-- -dom, in openings of phragm sheets and riveted over on the outer sides of the shell sheets, and by thimbles, 70,

expanded into the shell and diaphragm sheets, or screwed thereinto if preferred, and

beaded over on said sheets, t rou h which thimbles there are passed bolts, 72, y which the superheater pipes, 69, are secured to the connection casing, as presently to be described. The diaphragm, 70, is further stayed to one of the shell sheets by shorter thimbles, 70,t-hrough which one of the chambers of the connection casin communicates with one end of'each'of t e lines of superheater. pipes. 'Therforksor branches 62, and the branch steam pipes, 63, are secured to the opposite sides of the connectionfeasing, opposite coriresponding openings in the chambers thereof by bolts, 62', passing through thimbles, 70, expanded or screwed into the shell and diaphragm sheets, and having nuts, 62, on their ends, ball joint rings, 62, being interposed between the breeching pipe forks and branch steam ipes and the connection casing. The thim le, 70, which passes through the steam passage of. each ofthe breeching pipe forks, may be either expanded or screwed thereinto, as indicated in Fig. 6, or be cast integral therewith, as in Fig. 7. preferred, the thimbles, 70, may be dispensed with, and the bolts, 62", be screwed directly into the shell and diaphragm sheets, as shown in Fig. 7. i

In order to'prevent deflectionohthe diaphragm, 70, by the impact of the saturated steam entering the chamber above it, it may be provided with a reinforcing plate, 70, on one or both of its sides, said plate or plates being secured in position by the bolts, 62, as shown in Fig. 7 and to prevent the transmission of heat through the diaphragm from the superheated to the saturated steam, the diaphragm may be formed in two separate sheets, with an interposed sheet or layer of suitable non-conducting material, 70, as shown in Fig. 9.

The opposite ends of the lines of super heater pipes, 69, are secured to the connec-,

71, which, as

tion casing by means of yokes, shown in Figs. 4- and 9, are drawn to a tight bearing on collars on the pipes and on the opposite shell plate of the connection casing, by bolts, 72, passin through the thimbles', 70, before desert ed, and provided with nuts, 72. As shown in Fi per-heater pipes fit', with consi erable freeyokes, 71, to allow lengthwise adjustment 'of said pipes for accurate accommodation to the seats or joints on the casing.

Spherical faced washers, 72",are inte osed between the nuts and yokes at one an and between the nuts andthimbles at the other. As shown in Fig. 5, the thimbles, 70, are dispensed with, and the bolts, 72. are

. 9, the su greater diameter in the screwed into the shell sheets. One end of each line of superheater xpip'escommunicates directly with one of the chambers of the connection casing, and the other end of each line communicates, through one of'the shorter thimbles, 70, with the'other chamber of the casing. The ends of the pipe sections are spherical faced, and fit, by suitable ground joints, in correspending sedts in the adjoining shell plate of theconnection casing. In order to enable the yokes to be'l'l'l'dily removed from the tubes when required, spherically cupped collets, 73, divided into two diametric sections; are inter osed between the tubes and yokes. The sp erical faced end collars, 69,

of the 'superheater pipes, 69, are made slightly smaller than the holes through the yokes, so thatwhen the half sections of the collets are taken out of the depressions in the yokes, the latter can he slipped olf the pipes. 1

Inasmuch as the form of the connection casing, and its position relatively to other members of a superheating appliance in which it is applied, may be .varied in sundry particulars, in accordance with the conditions of application, in the discretion of a constructor skilled in the art, without departure from the spirit and operative principle of my invention, I do'not limit my claims thereto to the specific embodiment herein described and shown, but include therein all structural modifications thereof which embody the essential and character.-

istic features of my invention.

I claim as my invention and desire to se cure by Letters Patent. 1. In a steam boiler superheater connec- 49 tion ca.sing,'the combination of two plate metal casing sheets, one at least of which is dished or pressed into channel form in transversesection, and an intermediate diaphragm sheet, said casing and diaphragm sheets being secured together on their edges,

transverse-stays extcndin through and secured to said sheets, and thimbles extending through, terminating at, and being secured to one of the casing sheets and the diapliragm sheet, respectively. z.

n a steam boiler superhcater connection casing, the combination of two plate metal casing sheets, having, respectively, a steam inlet and a steam outlet opening, and

5 an intermediate diaphragm sheet, said sheets being secured together peri herally, thimbles fixed in the diaphragm sheet and one of the casing sheets, stay bolts fixed in the casing sheets and diaphragm sheet, superheater pipes communicating with the casing sheet ends of the thimbles, and ball" joints-interposed between the superheater pipes and thimbles. 3'. In a steam boiler superheater connec- Zl'5 tion casing, the combination of twoplate and diaphragm tion casing, the combination of two late metal casing sheets, 'havin respective y','a

steam inlet and a steam out et opening, and

an intermediate diaphragm sheets bein secured toget er and a rein orcing plate secur to the diaphragm sheet opposite the steam inlet open- -1ng.

5. In a steam boiler superheater connection casing, the combinationof two late metal casing sheets, having, respective y, a steam inlet and a steam outlet opening, and anintermediate diaphragm sheet, said sheets being secured together peripherally, and a plate or layer of non-conducting material secured to the diaphragm sheet. d

6. In a steam boiler superheater, the com.- bination, with a connection casing comprising two late metal casing sheets having, respective y, a steam inlet and a steam outlet opening, and, an intermediate diaphragm sheet,'said sheets bein secured together eripherally, and thimb es secured to the d1aphragm sheet and one of the casing sheets, of return bend superheater pipes communieating with, and hearing at one end on the thimbles and communicating at the other with openings in the casing sheet to which said thimbles are secured, on the edges of which openings they bear, yokes bearing on collars on said superheater pipes, and iaving openings throu h which said ipes pass with freedom. of adjustment, and bolts securln 7. In a steam boiler superheater, the com bination, with a connection casing substantially as herein set forth, of return bend superhea ter pipes communicating at their ends with the chambers of thecasing, yokes bearing on collars on said superheater pipes, thimbles extending through the connection casing and secured in the sheets thereof, bolts passin" through said thimbles and'through said has, and nuts engaging threads on said bolts and clamping the superheater pipes to seats on the connection casing.

. 8. In a steam boiler super-heater, the combination, with a connection casing substantially as herein set forth, -of return bend superheater, pipes communicating at their ends with the chambers of the casing, yokes bearing on collars on said superheater pipes, thimbles extending thro h the connection casing and secured in thes eets thereof, bolts passing through said thimbles and through said yokes, 'nuts engagingsaid bolts and clamping. the superheater pipes to seats on sheet, said eripherally,

said yokes to the connection casing.

the connection casing, and spherical faced washers interposed between and bolts and said thimbles.

9. In a steam boiler supcrheater, the combination, with a connection casing substantially as herein set forth, of return bend supcrheziter pipes communicating at their ends with the chambers of the casing, yokes bearing on collurs on said superheater pipes, bolts passing through the connection'casin and through said yokes, nuts engaging sai bolts and clamping the superheater pipes to seats on the connection casing, and diametrically divided collets interposed between the yokes and the collars of the superheating n es. l 10. In a steam boiler superheater, the combination, with a connection casing, substantially as herein set forth, of a breeching pipe having forked end portions registering with steam inlets in one chamber of the casing, brunch delivery steam pipes registering with steam outlets in the other chamber of the casing, and bolts assing through the casing and securing the reechmg pipe and branch deliver steam pipes to opposite sides thereof.

11. n a steam boiler superheater connection casing, the combination of two wrought metal casing sheets, one at least of which is dished or pressed into channel form. in transverse section, and an intermediate diaphragm sheet,.sa1d casing and diaphragm sheets being secured toget r on their edges and formin a two chambered shell or casing which s centrally recessed at front to clear a smoke stack, and is provided with two steam inlet openings on one of its sides, and two steam outlet openings on its 0 posite side, said openings bein dispose pairs on opposite sides of its front recess.

WILLIAM DALTON. Witnesses: v

F. T. Mamie, J. L. STEELE.

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