US1746272A - Heat-conducting tube - Google Patents

Description

Feb. 11, 1930. T. E. MURRAY HEAT CONDUCTING TUBE Filed June 18,' 1924 Patented Feb.l` 11, 1930- UNITED STATES PATENT! olv-Fica THOMAS E. MURRAY, F BRCOKLYN, NEW YORK; JOSEPH BRADLEY MURRAY, THOMAS E. MURRAY, JR., AND JOHN F. MURRAY DECEASED Application filed June 18,

In certain prior applications, Nos. 642,427 filed May 31, 1923 and 642,725 filed June 1, 1923, I have described a certain hollow construction for walls and other parts of boilers or heaters and made up of tubes of rectangular, circular or irregular cross-section with fins or flanges extendin lengthwise thereof so as to provide a heating surface 'exposed` to the heating gases greater than the surface which is in contact with the water or other fluid in the tube.

The present invention provides a unit from which such boiler walls and the like ma?7 be built. The accompanying drawings i lustrate embodiments of the invention.

Fig. 1 is a horizontal section of a side wall of a boiler built Vwith the. tubular units of the invention;

Fig. 2, is a plan of a unit made in accordance with the invention;

Figf is a perspective view of another unit;

Fig. same.

In another application pending concurrently herewith Serial No. 715.369, filed May 23, 1924, I have describeda certain style of unit for use in the building. of such walls or screens. The resent application is directed to units of di erent styles specifically from those described in the said application and in other applications which I .have pending.

According to Fig. 1. the boiler wall is'provided with a lining or .screen comprising tubes 1 with fianges 2 which are of .zig-zag shape so as to provide an extended width of surface within a comparatively'short space between the tubes; the edges of the flanges from adjacent tubes being overlapped and hooked into engagement with each other so as to hold them close together in spite of distortion under heat. Back of the screen thus formed is an ordinary wall which may, for example, be'made of refractory bricks 3 and insulating tiles 4 held by a sheet steel casinfr 5.

t:Ihe increased superficial area of the iins or fianges may besecured in various other Ways than by bending. For example, in Fig.4

50 2 the fiange is formed of a common rolled 4 is a longitudinal section of' the diameter,

EXECUTORS 0F SAID THOMAS E. MURRAY,

HEAT-commune TUBE 1924. serial no. 790.734.

shape 6 which in turn is provided with fianges 7 on its side faces. Thus the width of the surface exposed' is very' much greater than This the overall width in a straightline. flange is fastened by butt welding as at 8 to a seamless steel tube. Various other methods maiy be used for assemblingthe parts.

nstead of getting the extended surface by use of a single flange member as in Fi 2, it may be obtained 4by using a number o such members separately fastened to the tube. See Figs. Sand 4. Here the tube has a number of rods 9 extending len hwise `and located at intervals around t e outside of a portion of the tube. The same arrangement may be repeated at the diametrically op osite portion o the tube. The rods 9 may e of rectangular or other cross-section, instead of the round shape shown, and of* differing dimensions, and they may be united to the tube in` various ways. v

According to Fig.l 4, I have shown each of the rods 9 Welded at intervals in its length,

as at 10. to the outside of the seamless tube.

The intermediate parts of the rod may be in close contact with the tube, or maybe slighty ly separated therefrom as illustrated.

As described in Murray application No. 715,369, above referred to, the tubes may be of various shapes, and the flanges may be of various compositions or may be specially coated to increase their resistance to oxidation by the flame.

Though I have described with great par-l ticularity of detail certain embodiments of my invention, yet it is not to be understood vtherefrom that the invention is restricted to the `particular embodiments disclosed. Vari# ons modifications may be made by those skilled in the art without de arting from the invention as defined in t e following claims.

What I claim is:

1. A heat conducting unit for boilers constituting a separate and complete .article of manufacture and comprising a long, smallthin-walled, steel boiler tube adapted to carry water with a longitudinal iange extending the full length of the tube and adapted for 'exposure to heating gases` Ion said flangehavin an exposed side face which is uneven and isf greater developed width than the projected width of the ange itself so as to present an extended surface to the 5 heatin the tube having a continuous wall o uniform thickness throughout its circumference and the flange being a se arately formed piece welded at one edge to t e outer p face of the tube and .having `its otheredge l 2. The heat conducen unis of claim 1,

the ange being a strip o sheet metal of uniform thickness and zig-zag cross-section.

8. The combination of a plurality' of heat u conducting units for boilers separate from but adjacent to each other, each comprising a tubular member adapted to car water and longitudinal fienges on opposite sides extending the full length of the unit and adapted zo for ex sure to the heating gases, said flanges ing vwelded to the tubular members but unconnected to each other, the flange of one unit having a hook-shaped portion engaging the ad'aeent edge of the flange of the 25 next unit to o ld them together under distortion by heat. In witness whereof, I have hereunto signed;

my name.

THOMAS E. MURRAY. 30

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