US1595563A

US1595563A - Heat-conducting tube

Info

Publication number: US1595563A
Application number: US721180A
Authority: US
Inventors: Thomas E Murray
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-06-20
Filing date: 1924-06-20
Publication date: 1926-08-10
Anticipated expiration: 1943-08-10

Description

Aug. 10 1926. 1.595563 T. E. MURRAY HEAT CONDUCTING TUBE Filed June 20, 1924 j v [NI 5A" 70R fiat Z447 I M 4 A TTURNEY Patented Aug. 10, 1926.

UNITED STATES THOMAS- E. MURRAY, or BROOKLYN, NEW YORK.

HEA'1 -CONDUCTIN G TUBE.

Application filed June 20, 1924. Serial No. 721,180.

In certain prior applications, Nos. 642,427

filedMay 31, 1923, and 642,725 filed June 1, 1923, I have described a certain hollow con-- struction 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 extending 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. v

The present invention provides a unit from which such boiler walls and the like may be built. The accompanying drawings illustrate embodiments of the invention.

Fig. 1 is a horizontal section of a side wall of a boiler built withthe tubular units ofthe invention; Fig. 2 is a perspective View partly in section showing the ends of certain oblong tubes and their connection with a header 5 Figs. 3 to 8 are plans of various forms of unit made in accordance with the invention. Referring to Fig. "1, the boiler wall is made with an inner lining or screen comprisingtubes 1 with lateral fins or extensions across the spaces between the tubes. On the outside of this screen is the wall of the boiler structure which may be of any usual or suitable material and which as illustrated comprises refractory blocks or bricks 3 outside of which are tiles 4 of non-conducting material and an outer shell 5 of sheet metal. The longitudinal fins extend throughout such portions of the length of the tube as may be desired according to the design of the boiler and throughout the zone where their conducting efi'ect is desirable. As shown in Fig. 2, they extend to a header 6 into which the upper ends of the tubes are introduced.

' and with convex ends which are welded to the circular tubes at 8. Fig. 3 illustrates a structure in which a number of circular tubes and fiattubes are in a single structure. Instead of this, the

welded edge to edge wall may be made in units which are separate from each other, each'unit comprising a circular tube with an extension at one side; or a tube having extensions welded to both sides of it and the next circular tube being plain.

According to Fig. 4, the extension comprises a rolled shape having two opposite diverging sides 9 welded at-their ends to the circular tube as at 8 and connected at their outer edges by a portion 10.

According to Fig. 5, a known rolled shape comprising two diverging members 11 is welded at the inner edges thereof, these members being connected at their outer edges to a broad flange 12. y

According to- Fig. 6, the tube 1 has welded directly to it at 8 a plate 1.3 with a flange 14 at its outer edge, and a separate plate 15 is set in the space between the flange 14 and the tube. This sort of double extension may be provided at each side of the tube as shown at the left and a similar extension may be provided 'at the inner'face of the tube, that is, the face exposed to the fire,

as for the right hand tube.

According to Fig. 7, the extension comprises a looped sheet 16, the inner edges of,

which are brought together and welded to the tube as at &

According to Fig. 8, a similar construc tion is obtained by uniting two segments each having a semi-circular central portion 17 with flat side portions 18 on the ends of which are flanges 19, which flanges are welded together along joints 20. Since this flanged tube, thus constructed, is exposed to the pressure within the tube, it is advisable to fasten theflanges 18- together, and this is accomplished by spot-welding or otherwise welding them at 21.

In all the above cases, it will be observed that the lateral extensions from the tubes are of double thickness, so that only one face of the metal isexposed to the destructive 'eflect of the fire. The inner faces of the looped constructions of Figs. 4 and 5, for

main tubes 1' may carry the water and the lateral tubular extensions 7 may carry air .or other fluid to.be heated. Where flat tubes 'Fig. 6. Although I have referred to each unit as consisting of a single tube with an extension at each side of it, yet it may oonsist of a plurality of tubes with proper extensions. For example, Fig. 3 may be taken to illustrate a unit consisting of two tubes 1 with a connecting hollow web; a

4 number of such units being used separately to build u a wall with contacting or overlapping e ges. A full description of the method of use of these units and of the best methods of welding the arts together is described in another app ication which I have filed concurrently herewith, Serial No. 715,369 filed May 23, 1924. As described in said application also, the lateral exten sions applied to the tubes can advantageously be made of special metal or specially coated to resist deterioration by the heat. But this is not so important in the present case where only one face of the metal is exposed to the heat.

Though I have described with great particularity of detail certain embodiments of myinvention, yet it is not to be understood therefrom thatth'e invention is restricted to the particular embodiments disclosed. 'Various modifications may be made by those skilled in the art without departure from- '1. A heat conducting unit for boilers com- I prising a tube for water with an external lateral extension lying substantially parallel to the tube and exposed to the heating gases, said extension being composed of two parts, one of which lies in front of the other and shields a face of it from the heating gases.

2. A heat conducting unit for boilers comprising a tube for water with an external hollow lateral extension lying substantially parallel to the tube and exposed to the heating gases.

3. A heat conducting unit for boilers comprising a tube for water with an external lateral extension lying substantially parallel to the tube and exposed to the heating gases, said extension being composed of two parts welded to the tube and one lying in front of the other.

4. A heat conducting unit for boilers comprising a tube for water with an external hollow lateral extension welded to said tube and lying substantially parallel thereto and exposed to the heating gases.

5. A heat conducting unit for boilers comprising a tube for water with an external lateral extension consisting of a second tube welded to the first and lying substantially parallel thereto and exposed to the heating gases.

6. A heat conducting unit for boilers comprising a tube for water with an external lateral extension consisting of a second tube flattened and welded at an end of its longer diameter to the first tube and lying substantially parallel thereto and exposed to the heatlng gases.

In witness whereof, I have hereunto signed my name.

THOMAS E. MURRAY.