US2153806A

US2153806A - Method of forming a heat exchange device

Info

Publication number: US2153806A
Application number: US20206A
Authority: US
Inventors: Karmazin John
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1935-05-07
Filing date: 1935-05-07
Publication date: 1939-04-11
Anticipated expiration: 1956-04-11

Description

April l1, w39. J. KARMAZIN METHOD OF FORMING A HEAT EXCHANGE DEVICE Filed May 7, 1935 JEH/v KA INVENTQR A R/f/lZ//r XTTORNEY.

flexibility in manufacturing the devices in various being utilized whereby different lengths of header constructed according to the present invention: scope into the corresponding tubular projections METHOD oF FORMING a HEAT EXCHANGE DEVICE FFW@ -UNITI- John Karmazin, Huntington, Ind.; assignor to General Motors Corporation, Dayton, Ohio, a' corporation of Delaware Application May 7, 1935, Serial No. 20,206

3 claims. .(oi. .e9-157.3)

This invention relates to refrigerating appa- Fig. 4 is a perspective'view of a portion of the ratus and more particularly to a novel heat exheader construction at an intermediate state of change device for usein refrigeratiug apparatus manufacture; and for other purposes. Fig. 5 is a perspective view of the second por- Heretofore, in constructing heat exchangers of tion of the header construction at an intermediate 5 the 'type comprising a plurality of parallel tubes stageof manufacture; .usually having fins thereon, the necessity of con- Fig. 6. is a perspective view of a portion of necting together the ends of the parallel tubes in another header construction shown in an intersome manner has presented a problem. For exmediate state of manufacture; and ample, if it is desired to connect the ends of a Fig.,7 is a perspective view of anotherportion 10 plurality of tubes into a single header for placof a header construction shown in -an intermeing the tubes inparallel circuit Irelation,l the diate stage of manufacture. header constructions heretofore employed have Referring now to Fig. 1, the heat exchange necessitated the use of individual dies for each device comprises a heat exchange core III which size of heat exchanger which is constructed. In is formed of a plurality of parallel tubes I2 and 15 supplying the needs of the trade, it is necessary transverse fins I4. The heat exchange core may vthat a large range of sizes be manufactured, due be formed in any suitable manner, the core illusto the many varied individual requirements imtrated .being formed from fins having integral posed by the various applications for heat extapered: tubular projections formed therein and change structures. In meeting these requiretelescoped vwith similar projections of adjacent ments, particularly for heat exchangers having fins to provide the continuous tubes I2. Such a their tubes connected in parallel circuit relation, coreconstruction is illustrated in' Vmore detail in the cost of the different dies andv other machine the patent to Karmazin-l,997,563 issued April 9, tools which must be constructed individually for 1935. At either end of the core I0, headers I6 each different size of heat exchanger has conand lI8 are provided to connect the tubes I2 in 25 tributed materially to the high cost of such deparallel circuit relation. Suitable inlet and out-- vices particularly where the number produced in

let connections

20 and 22 are provided in the a given size is rather small. headers I6 and I8 respectively.

It is an object of the present invention to pro- Each of the headers I6 and I8 are formed vide a heat exchange structure by which greater somewhat similarly in order to admit of a process sizes is obtained without prohibitive costior a for diierent heat exchangers do not necessitate small production of a single size of heat exthe use of individual tooling for each length. changers. Thus, each header is formed from a' pair of More particularly, it is an object to provide a channel-like members which may be cut from a heat exchanger and header construction therelong strip of channel-like material in any length for, by which the same set of manufacturing tools desired. The pair of channel-like members are and machinery maybe utilized for. producing telescoped together in order to provide aclosed heat exchangers having headers of various lheader having openings for engagement with the lengths without the necessity of individual dies tubes of the heat exchanger core. The header I6, and tools for each individual length. for example, may be formed from a pair'oi It is a furtherobject of the invention to prolengths of channel-

like strips

24 and 26 which 'vide anovel method of producing heat exchangers are telescoped together as illustrated in Fig. 2. and headers therefor from sheet metal at low The channel-like strip may be formed in any of cost. ai number of ways, for example, as by extrusion, -45 Further objects and advantages of the present orV by rolling or stamping from a flat strip. invention will be apparent from the following Either before-or after the strip is given the chandescription, reference being had to the accomnel-like form, suitable tubular projections 28 are panying drawing, whereinv a preferred form of formed therein at intervals corresponding to the present invention is clearly shown. the spacing of the tubes I2. The tubular projec- In the drawing: tions 28 form openings to the header 'I6 and in Fig. 1 is a view in elevation of heat exchanger the construction illustrated are tapered to tele- Flg. 2 is a cross section on line 2--2 of Fig. 1; lformed in the top fins I4 of the core. The chan- Fig. 3 is a cross section on line 3-3 of Fig. 2; nel-like strip from which the member 24 is cut 55 has a suitable opening formed therein by which the inlet connection 2li is secured to the header i6. The opening 30 is preferably formed after the member 24 is cut from the strip of material of channel-like form.

The header i8 is formed by a similar process to provide a pair of channel-

like members

32 and 34 corresponding respectively to the

members

24 and 26. In the construction illustrated, the channel-like member 34 is provided with a plurality of tubular projections 36 on the upper surface thereof which are given a reverse taper to receive the tapered tubular projections of the lower-most iin I4. 'I'he cross sectional shape of the channel-

like members

24, 26, 32 and 34, in the forni of the invention illustrated, is approximately that of a partial cylinder. That portion of the strip 2 6 and strip 28 between the openings or

projections

28 and 36 respectively may be either a continuation of the cylindrical arc as shown in Fig. 5 or may be fiat as shown in Fig. 7. When the

protuberances

28 and 36 are formed after the strip is given its channel-like form, it is convenient to use the construction illustrated in Fig'. 5. When the

protuberances

28 and 36 are formed from the fiat strip, it is more convenient to utilize the form illustrated in Fig. 7. It will be understood, of course, that various other cross sectional iorms may be utilized so long as the outline of the assembled channel-like members of the header provides a generally tubular structure.

After the lengths of channel-like strip have been cut from .a longer piece of the same, the

members

24 and 26 are telescoped together and the

members

32 and 34 are telescoped together as illustrated in Fig. 2. Suitable end closures 38, preferably of stamped sheet metal, are next applied to the ends of the headers i6 and i8 and the inlet and outlet connections 2i? and 21T inserted in the opening 3i] and a corresponding opening formed in the channel-like member 32.

The headers I6 and iii are then assembled to the core i0 and the entire structure bonded together by a suitable sealing medium. For example, the heat exchanger may be sealed by copper welding ina furnace having a reducing atmosphere, or the structure may be sealed by a solder dip. While it is most convenient to seal the entire heat exchanger including the core I0 and the headers i6 and i8 at one operation, it may be desirable in some cases to seal the headers i6 and I8 and the core lil individually before assembling them together. Likewise, while the inlet and outlet connections have been illustrated as connecting at an intermediate point along the length of the header, it may be desirable in some instances to connect the inlet and outlet connections at one end of the header, in which case the closure 33 at that end is omitted and the inlet or outlet connection substituted therefor.

While the form oi' embodiment of the invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. The method of forming a heat exchange device which comprises the steps of forming a header by forming a pair of channel-like strips, each strip having a substantially circular segmental cross-section and an open longitudinal side and one strip having a plurality of tube engaging openings with integral tubular flanges along one wall thereof, longitudinally telescoping said pair of short lengths of strip together with the circular portions overlapping throughout approximately half their circumference, placing end cups over the ends of the telescopes, assembling a plurality.

of tubes into engagement with said openings and bonding the tube and header structure together with a sealing medium.

' 2. The method of forming heat exchange devices Which comprises the steps of forming headers by forming a pair of channel-like strips, each strip having a substantially circular segmental cross-section and an open longitudinal side and one strip having a plurality of tube engaging openings along one wall thereof, telescoping said strips together with the circular portions overlapping throughout approximately half their circumference, forming iin and tube heat exchange cores, assembling the'tube ends of said cores into engagement with said openings, placing end cups over the ends of the telescopes, and bonding each entire heat exchanger together by a single fused metallic sealing operation.

3. The method of forming a heat exchange device Which comprises the steps of forming a header by forming a pair of channel-like strips, each strip having a substantially circular segmental cross-section and an open longitudinal side and one strip having a plurality of tube engaging openings along one wall thereof, longitudinally telescoping said pair of strips together with the circular portions overlapping throughout approximately half their circumference. forming a fin and tube heat exchanger core, assembling the tube ends of said core into engagement with said openings and bonding the entire exchanger together by a single fused metallic sealing operation.

J OI-IN KARMAZIN.