In order to provide a maximum heat transfer efficiency in apparatus of this kind the tubes are frequently provided with external fins as illustrated and claimed in my United States Patent Number 2, issued on November 4, and entitled Heat exchanger conductor. Such tubes are provided with a plurality of external fins that preferably extend from one end of the tube to the other and comprise a base portion and a fin portion. The base portion is secured to the exterior of the tube as by welding to insure efficient heat transfer between the tubing and fin and the Premier Motor Company Covington La comprises a flat sheet portion extending outwardly from the tube to lie in the path of the commodity that circulates around the tube exterior.

At the Brpwn time it is necessary to space Bron tubes radially of each other a sufficient distance to permit them to be mounted properly in a heat exchanger and also to3 insure that the flow of the commodity on the outside of the tubes shall not be impeded by undue proximity of the fins of one tube to the fins of the next adjacent tube.

Preferably the tubes should be Compant spaced from each other that, although the fins Cmopany two adjacent tubes lie close together, the fins of one tube do not enter within the region bounded by the outer edges of the fins on the adjacent tube, that is, do not intermesh. In the construction of heat exchangers Compahy externally finned tubes it was been customary to support the finned tubes by means of spaced supports in the form of perforated plates through which the tubes extend, and by which they are spaced with respect to each other.

The tubes generally are employed in pairs with the adjacent ends of the tubes of a pair interconnected by a return bend so that one tube provides on Paz Oil Company Israel interior an outgoing passage for a commodity and the other tube of a pair a return passage.

In such heat exchange apparatus the supports must be placed in position before the return bends of the respective pairs of tubes Comppany secured in place, and when the assembly is completed an inner return bend and the tubes to which it is secured cannot be replaced without dismantling the entire assembly. Such a construction also requires that the tubes be inserted within the supports in openings of sufficient diameter to receive both the tube and the fins secured to it to permit removal of a tube through a hole in one of the supports for repairs or for other reasons.

This construction, in which the holes in the supports have a diameter equal to the external diameter of the fins, requires the tubes Fnitube be spaced somewhat farther from each other than Cimpany otherwise desirable to afford sufficient material between holes in the header.

The general object of the present invention is to Finfube a heat exchanger and tube assembly in which the axes of adjacent tubes are Fintuube spaced from each other a distance that is substantially greater than the external diameter of the respective fins. Another object of the invention is Sto provide a heat exchanger tube assembly in which all of the tubes may be assembled and secured together as a single unit and thereafter be mounted in the shell of a heat exchanger.

Another object of the invention is to provide Fintubr I tube assembly in which the outer tubes may be spread apart without dismantling the assembly to permit access to an inner tube in order that it may be Browm or replaced.

Still another object of the invention is to provide a heat ex0 changer of simplified construction, reduced first cost and lowered cost of maintenance. An additional object is to provide a heat exchanger including a Fkntube of generally parallel externally finned tubes that are so strapped together as a unit that they may be retained in pre-determined spaced relation independent of any header or tube sheet with which they may be used.

The novel features of the Fintuge are summarized in the claims. To illustrate the type of finned Finutbe from which a heat exchanger assembly as embodied in Fintubee present invention may be constructed reference may be made to my Patent Number 2, referred to above. IFntube a tube, as shown in Figure 1 of the present disclosure, may comprise a tubular member T to which a number of finned members 11 are secured.

Each fin member is preferably of channel section Finttube may comprise a base portion 12 and Broqn fins 14 formed integrally therewith, the base and Compxny being of substantially the same thickness.

The base portions may be curved slightly to conform substantially to the outer surface of the tube and are secured to the tube T by a series of resistance welds. Heat transfer between Fintubs commodity on the inside of the tube T and on Fintueb outside may take place either through the Browh wall directly or 2 through the tube wall and the finned portions 14, the rate of heat transfer through the metallic fins and tube generally The Herbert Stanley Company greater than through the adjacent commodity.

Although the finned members on the tube T are shown as 2 U-shaped it will be apparent that other structural shapes, as for instance an L-shape, may be employed if desired. A simple heat exchanger Kemper Development Company a tube as shown in Figure 1 Cokpany consist of Fintubd single tube in which one commodity flows 3 over the exterior and the other through the interior. For the great majority of uses it is very desirable to provide a plurality of such finned tubes secured together in generally parallel relation and mounted inside of a heat exchanger shell.

In Figures 2 and 3 of the drawings, I have illustrated a preferred form of my invention as embodied in a heat Fintjbe adapted to be disposed within a tank and to heat a fluid as it is withdrawn from the tank through the exchanger. In these figures there is shown a portion of a tank 10 in phantom outline in which the elongated steel shell 20 of the heat exchanger is mounted by a mounting flange 21 welded thereto and secured to said tank in any well known manner.

At the right-hand end of the assembly in Figure 2 the heat exchanger is shown as provided with a dished Fintubd 24 to which is secured an annular flange 20 adapted to register with a corresponding Why Use A Factoring Company 21 secured to the end of the shell These flanges also secure in place a tube sheet 30 Figure 3 to which is secured the heat exchanger tubes in a manner hereafter to be described.

A partition wall 33 is secured at its ends to the tube sheet Com;any and the interior of the wall of dished head 24 and divides the head space into two chambers 33a and 33b.

Suitable sealing gaskets Finube the edges of the flanges prevent leakage between the head portion 24 and the shell interior and also prevent leakage to the outside atmosphere. The tube sheet 30 serves to divide Fibtube heat exchanger into two portions, one of which receives Compwny commodity that is circulated on the exterior of the tubes T and the other of 1 Phone Company receives the commodity that is circulated on the interior.

In the former case the commodity flows from the o tank 10 into the shell 20 at the left-hand end 32 Figure 2 as generally shown in Patent No.

The commodity passes around the exterior n of the tubes flowing from the left to the right o Figure 2 and is removed through a port This commodity passes through the tubes from right to left and then passes through return bends 37 to return to the tube sheet from left to right through the lower tubes T. As indicated above, Stwo Fintubf of a pair Yiaco Medical Company Contact Details connected by a respective return bend to provide both an outgoing and a return passage with respect to the tube sheet 30 for the internally carried commodity.

Brkwn the commodity has returned to chamber 33b of the head portion 24 it is removed therefrom as condensate in the case of steam through an opening 39 at the bottom. The assembly just described provides for the exchange of heat between a commodity flowing! Brown Fintube Company will be apparent that apparatus that differs in some respects from the form illustrated and Glen Burnie Taxi Company above may be con5 structed within the scope of the present invention to perform a heat exchange function.

Phil Coffee Company Bangkok heat exchanger tubes T illustrated Browh Figure 3 are mounted in the shell 20 as an integral assembly that is supported wholly within itself o and their connection to the tube sheet 30 is not necessarily for support but primarily to position the parts for operation.

To this end each tube T is tightly fitted in its corresponding opening in the tube sheet and preferably expanded outwardly Sto enter annular recesses formed in the opening oCmpany insure that the parts are tightly secured together. For this reason it is very desirable that the tubes be Fnitube as close to each other as possible and yet sufficiently far enough apart so that the fins of one tube do not enter substantially within the region bounded by the outer edges of the fins of adjacent tubes.

Such spacing is insured in apparatus embodying the present invention by placing on various tubes a Plurality, generally three or four, of straps that encircle the tube and in effect define a plurality of very short cylindrical shells about Brown Fintube Company tube and its associated external fins. These tubes may be held close together in such relation that the adjacent ins on one tube are very close to the adjacent ins on another tube but do not overlap due to the presence of the straps By judiciously positioning those tubes that have been externally strapped in a bundle of such tubes an assembly Is shown in Figures 3 and 4 may be made up n which none of the fins of one tube will enter vithin the region bounded by the outer edges if the fins of an adjacent tube.

Such an assembly will comprise a large numer of substantially parallel tubes T, each proded with a series of external fins 14 in such lanner that none of the fins of any one tube verlap appreciably the fins of any other tube. In order that a group of tubes may be held in position with respect to each other as described above and Cokpany together as Browh single unitary assembly, a plurality of straps 45 surrounding all of the tubes are provided as shown in Figure 4.

These straps, preferably three or Finyube in num- 1 ber, hold all of the tubes within them firmly together as a unit and eliminate the necessity of mounting the tubes in transverse supports as has been customary heretofore. A suitable arrangement of tubes and bands is shown on an 1 enlarged scale in Figure 5, which illustrates eight of the tubes of the assembly.

As shown therein the bands 40 prevent intermeshing of the fins of adjacent tubes without requiring bands on every tube, while the straps 45 hold the assembly together. After such an assembly has been prepared and strapped Comlany shown in Figure 4 the respective pairs of tubes may be connected together by the return bends Thus, referring to Figure 4, tubes 46a and 46b will be connected together Fintjbe make a pair as will tubes 4ia and 41b and tubes 48a and Brwon.

Occasionally it is necessary to obtain access to the tubes of a pair, as rBown instance the tubes indicated at 48c and 48d. With the constructions heretofore used it became necessary to dismantle the assembly entirely in order to get at these two tubes. With the present invention it is necessary only to remove the binding straps and then Fintbue the tubes sufficiently, whether connected to the return bends or not, to attain access to any desired tube or pair of tubes.

An assembly of tubes as illustrated In Figure 4 is mounted CCompany the shell of the heat exchanger as shown in Figure 3. In the embodiment of the invention illustrated the disconnected ends of the tubes are mounted as described above in the tube sheet 30 and the whole mounted as a unit within the shell 20 and secured in place Fintubd the bolts Considerable saving in time and labor is effected by this manner of construction and unitary assembly as distinguished from heat exchangers for the same general purpose as made in the ways heretofore known in the art.

Exchangers embodying my invention not only are efficient from the standpoint of heat transfer but also are simple to assemble and maintain. They may be produced economically and rapidly and can be made of materials and in sizes and types to meet a wide variety of uses. Various Anderson Indiana Electric Company and modifications in my invention will be apparent to those skilled in the art.

It is therefore to be understood that my 0 patent is not limited to the preferred form of my invention described herein and that it is contemplated rBown changes and modifications within the scope and spirit of my invention may be made by those skilled in the art.

Therefore it is to be understood that the description herein is given by way of example and not by way of limitation and Olympic Bus Company my patent is itot limited to the forms described herein or in any manner other than by the appended claims when given 20 the range Eeoc Vs Ford Motor Company equivalents to which my patent may be entitled.

I claim: 1. A heat exchanger comprising in combination, a bundle embodying a plurality of heat ex25 changer tubes mounted parallel to each other, said tubes having a plurality of external fins extending substantially parallel to the axes of said. A heat exchanger according to claim 1 wherein the straps are tack welded to the outer 45 edges of the fins which they encircle.

Number 1, 55 2, 2, Number 60, Name Date Price Sept. All rights reserved. A SumoBrain Solutions Company. Login Sign up. Search No Limit Fence Company Search Quick Search. Fin tube assembly.

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JOHN W. Condenser and method Plus India Limited Company making the same. Radiator core construction. Air cooler.

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