US1633674A - Boiler - Google Patents

Description

June 28,1927 T. E. MURRAY BOILER Filed July lO. 1922 INVENTOR. THON/Hs E. MUR/MY /b ATTORNEY.

Patented June 28, 1927.

UNI'TED lsTA'rEs THOMAS E. MURRAY, OF BROOKLYN, NEW YORK.

BOILEB.

application med July 1e,

v The invention aims to provide boilersor the like and tubular units for the buildingl up of boilers and other structures,`and to provide a method of manufacture by which such structures can be produced very economically.

. The invention is primarily designed for low pressure service, but it may be used for high pressure with very slight modification.

The accompanying drawings illustrate an embodiment of my invention.

Fig. 1 is a perspective view of the tubular part of a boiler;

Fig.. 2 I's a similar view of parts used in making up one of the units thereof;

Fig. 3' isa lan of one of the sections which go to ma e up the several units of the boiler;

Fig. 4t is a vertical section through the lower ends of two of the tubular headers.

Referring to the embodiment of the invention illustrated, the boiler comprises a num. beiot units each comprising a `pair o vertical tubular headers 1 communicating with '25 each other through horizontal tubes 2. The headers 1 at one side are fastened together at their lower ends by means of a rod 3 (see Fig. 4) passingthrough them and through tapered thimbles 4 by which they are spaced apart; the headers l at the opposite'side being simila-rl astened to each other by a rod -5 passing t rough their upper ends; thus leaving theparts suflicient freedom for eX-I .pansion They may bejoined together in various other ways as, 'for example, by a common manifold.

Water is admitted to the bottoms of the front-row of headers through a pipe 6 and is carried olf through an extension 7 at the top of one of the rear line of headers. Or the water may flow in the opposite direction or lthrough various other known styles of connection.

I have assumed also that the path of the gases is upward through the tubular part 1922. Serial No. 573,928.

deflect the heating gases and to direct them along the most eilicient path. These battles are easily shifted to suit varying conditions, and increased or decreased in number as may be found best. I

According to my invention the boiler is built of pressed steel sections, which have very considerable advantages as compared with the cast iron sections commonly used, particularly for low pressure heating. The pressed steel sections do not crack like cast iron and are considerably lighter. Also practically all the tubular parts are cylindrical in cross-section, which utilizes moSt t' efficiently the strength of the material. The result is a' boiler of light weight and ot' greater strength and durability than cast iron.

Not only are the parts of pressed steel but they are unitedby welding with the smallest possible number of joints so as to make their manufacture economical and to make the product most reliable. Fig. 2 shows the method of manufacture. i

Each section is formed of two sheet metal segments of the character shown at the bottom of the figure. ll is stamped or pressed from a single integral sheet of metal, with a central part 9 constituting one-half of a horizontal tube divided on a vertical diametral plane and with ends 10 which constitute halves of vertical tubes divided on the same plane. Two such segments are butt welded to each other along their -edges as 'shown bythe dotted line 11 Fig. 3. This welding operation produces a complete section comprising a horizontal tube 2 with a short vertical tube 12 on each end. A number of such sections are built up by superposing them on one another as shown in the upper partof Fig. 2 and butt welding the short tubes 12 to each other. A series ,of the tubes 12 thus constitute a header 1 and these headers are closed at the top and bottom by plates welded thereon or attached in any other of numerous known ways. At one end of each header there areA transverse openings as shown in Fig. 4' for the connecting nipples or other fastenings. With thin sheet metal headers it is important that the edges be reinforced around these openings. This 1s accomplished by inserting a reinforcin plate 13 and welding it to the margin aroun the opening.

The size and number of the tubes in each unit may be varied as desired. The unit consisting of two Vertical headers with communicating horizontal tubes* may be handled separately as a complete article of commerce to be used in building up boilers of various sizes.

For such purposes the headers 1 may be horizontal and the communicating tubes '2 vertical, or these parts may be inclined. The segments which are stamped up are preferably segments ot afsingle communicating tube with a. corresponding length of header at each end, since such a shape can be most economically stamped out of rolled iron or steel or alloys thereof such as are commonly used for boilers. But it will be understood that each segment may constitute a part of two or more communicating tubeswith corresponding lengths .of header segments at the ends, and also, whether there be one or more segments of a communicating tube in a single stamping, the ends of the segments from which the headers are to be formed may be reduced to a-fsingle transverse segment or may be eliminated entirely, the headers being built up in other ways and being attached preferably by welding to the ends ofthe communicating tubes and to each other.

rllhe preferred method of welding the parts together is the Murray method whereby the parts are pressed together edge to edge between a pair of electrodes through which is passed a current 'of extremely high amperage, say ninety thousand or l more amperes per square inch or cross-section of the work for a very brief interval of time, say about one second or less. This produces a very quick and a very strong weld and makes it possible to build up the boiler in a series of rapid and comparatively inexpensive operations.

An improvedfeature is the making of the boiler from identical units, each made of two identical segments. F or this reason, we

f can build a complete boiler practically with one set of stamping dies, whether 'the boiler be large or small.

Though ll have described with great par- ,ticularity or detail certain embodiments of my invention yet it is not to be understood therefrom that the invention is restricted to the particular embodiments disclosed. `Various modifications thereof in detail and in the arrangement of the parts may be made by-those skilled in the art without departure from the invention as dened in the following claims.

recante tubular members are butt welded to one an other end to end to form the headers; and each such section being formed of two identical segments butt welded to each other along their edges, each segment being an integral piece of sheet metal oi' uniform thickness, the central part of which constitutes substantially one-half of a communic ating tube and the ends of which constitute halves of said short tubular members.

2. A boiler including in combination a number of units each comprising a pair of headers and communicating tubes spaced apart from each other and extending between said headers; each unit being formed of a number of'identical sections comprisin a communicating tube with a short tu ular member across each end, which tubular members are butt welded to one another end to end to form the headers; and each such section being formed of two identical segments butt welded to each other along their edges, each segment being an integral piece oi' sheet metal of uniform thickness, the central lpart .of which constitutes substantially one-half of a. communicating tube divided on a vertical .diametral plane and the ends of which constitute halves of said short tubular member divided on the same plane.

3. A boiler unit formed of a number of identical sections each comprising a tube communicating with a short tubular member across each of its ends, which tubular members are butt welded to one another end to end to form headers; each section being formed of two identical segments butt welded to each other along their edges, each segment being an integral piece of sheet metal of uniform thickness, the central part of which constitutes substantially one-half oi. a communicating tub'e and the ends of which onstitute halves of said short tubular memers.

lin witness whereof, l signed my name.

THUMAS E. MURRAY.

have hereunto lll@

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