US1749910A - Nipple construction for boiler furnaces - Google Patents

Description

March 11, 1930. J. w, by) 1,749,910

NIPPLE CONSTRUCTION FOR BOILER FURNACES Filed April 5, 1926 4 Sheets-Sheet l E be 17 I 1 z Z 7 I I 11 I H I! ll 7 I h (qwumdo'c John YXZfi d/ March 11, 1930. J, w, DYAR 1,749,910

NIPPLE CONSTRUCTION FOR BOILER FURNACES Filed April 5, 1926 4 Sheets-Sheet 2 r Jam n. D ar" MW/M I attained March 11, 193.0.

J. W. DYAR NIPPLE CONSTRUCTION FOR BOILER FURNACES Filed April 5, 1926 4 Sheets-Sheet 3 mvemtoz Jot/7 flgar I I ggi mflw March 11, 1930., J. w. DYAR 1,749,910

NIPPLE CONSTRUCTION FOR BOILER FURNACES um: April 5. was 7 4 sheets-sheet 4 Patented Mar. 11, 1930 PATENT OFFICE JOHN W. .DYAR, OF DETROIT, MICHIGAN NIPPLE CONSTRUCTION FOR BOILER FURNACES Application filed April 5, 1926, Serial No. 99,976. Renewed July 1, 1929.

The invention relates to improvements in boiler construction, and more particularly to the means for connecting together the various boiler sections and the steam dome.

The principal object of this invention is to provide a new nipple construction adapted to segregate the water laden steam passing upwardly from the return water passing downwardly. In the preferred embodiment of the invention, the nipple is provided with a partition Wall forming two separate vertical passageways, one being extended upward into the steam dome to permit escape of steam into the latter, and the other passageway being extended downwardly into the lowermost boiler section to provide means for insuring that all of the boiler sections are filled with water.

Such a nipple construction may be advan- 29 tageously employed in many of the commercial boilers on the marketat the present time and will'result in a better circulation of the water to all parts of the boiler and in a more constant level of the water line in the steam dome. The nipple construction is also of particular value when used in boilers of my own design, such as are illustrated in my co-pend ing applications, Serial Nos. 26,238, 26,239, 26,240, and 26,2etl,all filed on April 27, 1925. One of the valuable features of the invention is that by reason of the separate passageway for the steam and water, it is possible to de sign a boiler having fewer nipple connecr tions between the various sections than are ordinarily considered necessary, andvin the companion case-Ser. No. 99,975, filedon even date herewith, there is shown a boiler wherein only one nipple is required between ad- 40 vjacent boiler sections. Some of the features 'illustrated'in this applicationare also shown and claimed in the concurrently filed application, bearing Ser. No. 99,974 and in some respects the invention embodied in the present application may be considered as an improvement over the aforesaid case.

Several embodiments cl" my invention are illustrated in the accompanying drawings wherein: Figure 1 is a front sectional elevation of a or more series are 'ferentially of the boiler, each ser1es being arwell known boiler, equipped with my improved nipple construction.

Figure 2 is a cross section on the line 2-2 of Figure 1.

Figure 3 is a fragmentary sectional view similar to Figure 1, showing a modified construction.

Figure 4 is a side sectional elevation of a different type of boiler illustrating another modification.

Figure 5 is a longitudinal section through a preferred form of nipple on the line 55 of Figure 6.

Figure 6 is a top plan view thereof.

Figure 7 is a transverse section on the line 7. of Figure 5.

Figure 8 is a bottom plan view.

Figure 9 is a longitudinal section on the line 9-9 of Figure 6.

Figure 10 is a side elevation of the nipple shown in Figure 5, provided with auxiliary fittings.

Referring now to the particular embodiment of my invention illustrated in Figure l,

A represents a boiler section forming afire pot and a combustion chamber, B the ash pit and C the steam dome. The steam dome may be mounted directly on the fire pot section A,

"or one or more auxiliary sections D may be interposed between the same. Each of the so sectionsis provided with a water space D and has apertures D extending therethrough for the flue gases. All of the various sections are connected together by nipples E, of which two provided, spaced circumranged in vertical axial alignment so that a continuous passageway extends from the lower section A, to the steam dome C. The

construction as thus far described represents a boiler of a standard make and is obtainable with or without the auxiliary sections D, de-

pending upon the rating required for the particular installation.

My invention consists in providing an arrangement whereby the passageway through the axially aligned nipples is divided into two separate and distinct conduits, one for the steam, and the other for the return water.

As shown in Figure 1, I have provided a bushr from entering the return water conduit. The

tends through the water space D of the intermediate sections and'through the connecting nipples of the intermediate sections to the fire pot section A, terminating near the lower portion of this latter section.

WVith the construction as above described, the steam formed in the main boiler sectlon A and in the auxiliary sectionsl) passes upward y hrough't ippl n o the s e dome C, while a downward circulation of the return water is maintained through the passag w y H and h omlu I- The dvantage of this construction is that when the oile s bei g ired r ngly an steam is rapidly passing upward into the steam dome, there is always a return passageway for the Wat r whic is f e f om s fiem,'t u.s'p gutting a continuouscirculation of water to allparts of the boiler. I

In the modification shown in Figure 3 the conduit 1 does not extend to the bottom of the main boiler section A, butterminatesat the top of said section, at the point where it is usual-to provide a flaring or otherwise enlarged water space A. The lower portion of the conduit 1 has a return bend J so that the outlet J of said conduit faces upwardly. Thus the steam formed in the boiler section A can notdirectly enter the conduit 1, but in passing the outlet J has an ,ejeGtor action upon the water in the conduit tending to cause a downward flow therein. The conduit l is also provided with openings 1 communicating with the lower portion of each of the water spaces D in the intermediate or auxiliary sections, butthe portions 1? of the conduit I extending through the upper zone of the water spaces D form baffles which effectively prevent the steam forming insaid water spaces and rising to the top thereof steam passageway H in the bushing F is eX- nde up ar y i e Steam d m as r presented by the reference character E "The top of the conduit F? may be continued alcove the normal water line in the steam dome, or terminate slightly below the water level, but in either'case the steam formed in the under boiler sections, in blowing out throngh the conduit F2 will prevent. any substantial leme t of ate in-t s am dams fr m urn ng t r u h th eam p ssageway Th Water passag way H r ste sblv terminat s a h b om f the st am d me t fac litate. the down flow of Wat r h rethreus ltw l he'sedsrst sd tha the nipple sea struction as thus far described, can be adapted for use 'in boilers having any number of'intermediate sections by merely providing the I proper length for the conduit 1. c It will also be apparent that the tubular passageway may be provided by utilizing a separate bushing insertable within one of the nipples, or by making it integral with one of the nipples as hereinafter more fully set forth. v

In Figure 4 I have represented a .difierent type of boiler construction in which the main boiler section K has a steam dome L spaced above the same, to form a lateral flue passageway L and in this respect; is similar to the boiler described in my co 'pending application, Ser. No. 99,97 5 above referred to. In

this, construction the steam dome and the main boiler section are connected by a'single nipple only, arranged at the back of the fur:

nace. This nipple has the oppositely tapered end portions M, adapted to be pressed into the sections which it connects and itis also provided with an integral partition wall N, forming the steam and water passageways H I and respectively. A conduit 0 integral with the nipple extend s'downwardly theref m, orm ng a o i uat n of he p ag and a second conduit 1? also integral with the nipple extends upwardly forming a. coninuation of the pas ag Th con u t P is laterally bent at P to'direct the steam discharge laterally of the steam dome and the outlet is preferably arranged abovethe, normal water line ofthehoiler to avoid turbulence. The steam outlet conduit Q may be ar ang d e ly above he n pple nc dry steam is obtainable at this point due to the discharging of the water laden steam to- I ward the front of the boiler.

Re rr ng n w" more partic lar y o he preferred constructioniof connecting nipple as illustrated in Figures 6 to 10,3 represents the bottom wall of a steam dome and R the t p l of he b i section t whi h the dome is directly connected. Each of these wallshas a tapered aperture R therein, the taper corresponding to. the usual standard practice. S'represents the nipple as a whole, having acylindrical outer wall Sof a length corresponding to the spacing between the walls R and R. The cylindrical portion terminates-in tapered ven,dj portions S and S adaptedto seat in the tapered apertures R n th reby forming a tight s a -W smaller in cross sectional area and bounded by theconcave side of the partition wall. 1 The passagewayH" is extended above the tapering portion of the nipple by a conduit U, theupper portion U of which is ofspbstantially circular cross section and of smaller diameter than the cylindrical wall, The

that the conduit H communicates with the bottom of the steam dome.

The passageway H is extended downwardly by the conduit V, the lower portion V of which is cylindrical and the upper portion V is shaped to merge into the walls bounding the passageway H. The cylindrical portion V is preferably arranged so that its outer surface if prolonged could be inserted within a standard tapered nipple of the same dimensions as the cylindrical portion S,

when said standard nipple is arranged in axial alignment with the nipple S. The portion of the wall S bounding the passageway H is terminated at the bottom of the tapered portion S so that said passageway communicates with the upper portion of the boiler section to which the nipple S is secured. It

will be observed that the construction as above described is formed as a single member and may be used as a substitute for the ordinary type of nipple construction.

In order to extend the passageway H into the lower boiler sections a pipe W may be used, connected to the conduit V by a stand-- ard coupling W as illustrated in Figure 10. Similarly in order to providethe steam passageway H with means for directing the steam laterally of the dome, a standard elbow X is attached to the conduit U.

lVhat I claim as my invention is:

1. In a boiler furnace, the combination with a boiler section and a steam dome normally having water in the lower portion thereof, of a nipple connecting said dome and boiler section, a partition wall within said nipple dividing the same into two separate passageways, one of said passageways being extended above the normal water line in said dome and the other terminating below said water line. the latter passageway being extended directly into said boiler section.

2. In a boiler furnace, the combination with a boiler section and a steam dome above the same normally containing water therein, of a nipple connecting said dome and boiler section provided with a longitudinal partition wall forming two separate passageways and a conduit depending from said nipple into said boiler section forming an extension on one of said passageways, the lower portion of said conduit terminating in a return bend.

In a boiler furnace, the combination with a boiler section and a steam dome above the same, of a nipple connecting said boiler section and steam dome, a partition wall Within said nipple dividing the same into "two separate passageways, one of said passageways having its upper portion terminating at the bottom of said dome and having its lower portion extended directly into said boiler section, the other of said passageways having its lower portion terminating at the top of said boiler section and having its up 7 per portion extended upwardly above the normal water linein said dome. I

4. A nipple for connecting boiler sections comprising a tubular member having tapered'portions for engaging ad acent boiler sections, a partition wall within said tubular portion forming two separate passageways, said tubular member being formed with an integral conduit'extending beyond the tapered portion of .sai-d'tubular member forming an extension of one passageway.

, 5. A nipple for connecting boiler sections comprising a tubular member adapted to en-- gage said sections and form a tight joint therewith, a partition wall within said tubular member forming two separate passageways, walls projecting froin said nipple forming an extension of one of said passageways and walls projecting from the opposite end of said nipple forming an extension of the other passageway.

6. A nipple for boiler furnaces compris ing a tubular member having tapered portions at opposite ends thereof for engaging adjacent boiler sections, a partition wall within said tubular member forming two separate passageways, one of said passageways terminating substantially at the tapered portion and the other passageway terminating substantially at the opposite tapered portion and conduits forming extensions of each of said passageways, said conduits projecting from and beyond the opposite ends of said tubular member.

7. A nipple for boiler furnaces comprising a cylindrical tubular member having tapered portions at the opposite ends thereof for engaging adjacent boiler sections, a partition wall within said tubular member forming two separate passageways, a conduit having its axis off-set from the axis of said cylindrical portion, said conduit having its walls arranged to merge into the walls of one of said passageways and a second cylindrical conduit having its axis off-set from the axis of said cylindrical portion and having its walls arranged to merge into the walls of the other of said passageways.

8. A nipple for boiler furnaces comprising a cylindrical tubular member having tapered end portions, an arcuate partition wall within the said tubular member dividing the same into two separate passageways, and conduits arranged at opposite ends of the said tubular member for extending one passageway beyond one end of the tubular memher and the other passageway beyond the other end of the tubular member.

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