US131390A - Improvement in tube-coupling steam-boilers - Google Patents

Description

4 P. J. BRENNAN & Q. M. QUIGG. improvement in T-ub e-Cduplings for steam-Boilersr No. 131,390;

Patented Sep.17, 1872.

UNITED STATES ATEN Q PATRICK J. BRENNAN AND QUENTIN M. QUIGG, or NEw YORK, N. Y, SAID QUIGG AssIeNs HIS RIGHT TO sAID BRENNAN.

IMPROVEMENT IN TUBE-COUPLING STEAM-BOILERS.

' Specification forming pm of Letters Patent No. 131,390, dated September 17, 1872.

To all whom it may concern:

Be it known that we, PATRICK J. BRENNAN and QUINTIN M. QUIGG' 'Of the city, county, and State of New York, have invented certain new and useful Improvements in Sectional Steam-Boilers and we do hereby declare that the-following is a full, clear, and exact description of the same, reference being had to the accompanying drawing making part of this specification.

This invention relates to that kind of sectional boiler which is constructed of tubes with the water inside the same. In such boilers the tubes are often arranged in an inclined position, with the ends connected through and by means of small box-shaped castings. By this plan there are usually three or more joints at each end of each tube, in order to secure the castings to the tubes and to each other in such manner as to provide communication for the steam and water. These joints are liable to leak, and must all be broken when it is desired to renew an injured tube. Our invention consists of a connecting-coupling screwing both into the tube-head and onto the tube, and arranged so that it may be operated with an in- ;idedwrench through a hand-hole in the tube- In the drawing, Figure 1 represents a front elevation of our improved boiler. Fig. 2 is a longitudinal and vertical section of the same.

same, The ends of the tubes are secured,

a manner hereafter described, in large hollow slabs B B, called tube-heads. The products of combustion from the furnace O are preferably conducted between the tubes up near the front tube-head B, and thence down and.

up between the tubes, and between properlyconstructed deflecting-plates, to the rear of the boiler; thence down along the back tube-head B, and underneath it to the rear of the same; thence through fire-tubes D D, Fig. 4, arranged within the water-tubes, and more particularly; described hereafter to the front connection E;

and thence, in front of the tube-head B, to the chimney F. In the drawing but one deflecting-plate, G, is shown; but more can be employed in a well-known manner. H is a chamber for the reception of ashes and soot that may be carried over the bridge-wall or deflecting plates. 0. a are bearers supporting the tube-heads. I is a door, which may be opened to sweep the fire-tubes and repair the boiler. The back connection should be sufficiently wide to permit a man to work at the tubes; or may be provided with a door, the same as the front connection. The tube-heads are made generally of cast-iron. The inner and outer shells are connected by studs b 12, forming part of the same casting. To secure great strength when the steam-pressure is very high we run bolts or rivets through the studs, or put in socket-bolts in the usual way. The water-tubes are secured in the inner plates of the tube-heads by couplings Gr, one of which is shown separately in Fig. 5. This coupling consists of a hollow cylinder or ring provided with screwthreads of the same pitch on both its inner and outer surfaces, which threads extend nearly the whole length of the cylinder. At one end the opening in the coupling is slightly reduced in size, and formed with six sides, or with any number of faces or projections, to fit an insidewrench. The coupling G screws into the rear sheet of the tube-head and on the exterior of the'tube at the same time, care being taken that the threads start the same and are of the proper taper to insure a tight joint. Opposite the ends of the tubes are hand-hole openings 0 c, of sufficient size to'permit the removal through them of the tubes A and couplings G. These openings 0 c are closed by suitable bonnets or plugs d d, which, as represented, are

screwed into the outer plates of the tube-heads. The fire-tubes D D are arranged inside the water-tubes, and extend entirely through them across the water-space in the tube-heads, and into the hand-hole bonnets (1, each tube and bonnet being preferably secured together by a screw having the same pitch as that on the exterior of the bonnet, so that the latter, when it is put in, will screw into the tube-head and over the tube at the same time. The fronts of the bonnets d have annular projections with flat faces thereon to receive a wrench.

When it is desired, one end of each tube A may be screwed directly into a tubehead and the other end be secured with a coupling, as shown.

It is evident that the tube-heads for a large boiler may be made up of any desired number of slabs or comparatively-narrow tube-heads containing one or more rows of tubes, which slabs would be connected together in the usual way.

By the use of the coupling G an injured tube can be readily removed from any part of the boiler Without disturbing the j oints on the other tu es.

We are aware that the pipe-fitters reducin g-socket bears some resemblance in appearance to our coupling Gr; but the former does not, on many sizes, have the threads on the outside and inside of the ring of the same pitch, and the threads taper to connect with pipes of different sizes from opposite ends, which is diflerent from our device. The combination of our socket with a tube and tubehead is also new, and produces a new, useful, and desirable result.

The fire-tubes D act as stays to the front sheets of the tube-heads, and give great facilities for increasing the heating-surface of the boiler. They also enable us to conveniently carry the products of combustion on both sides of the tube-heads, and we thereby utilize as heating-surface what is cooling or radiating surface in many other boilers; also, the high temperatures on the two sides of the tube-heads entirely prevent them from being fractured by unequal expansion.

We claim as new and desire to secure by Letters Patent- The connecting-coupling G combined with a tube and tube-head, and constructed with its opening adapted to an inside-wrench, substan tially in the manner shown and described.

PATRICK J. BRENNAN. QUINTIN M. QUIGG.

Witnesses W. H. WEIGHTMAN, OHAs. E. EMERY.

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