DE2320866A1 - REINFORCEMENT ARRANGEMENT FOR HEAT EXCHANGER - Google Patents

Description

DH. ING. E. HOFFMANN · DIP}., IFGr. W. EITLE · DP. BER. NAT. K. HOFFMANN PATBNTANWJLlTK D-8000 MÖNCHEN 81. ARABEUASTRASSE 4 TELEPHONE (0811) 911017

23 757/8

Societe Anonyme des Usines Chausson, Asnieres, Hauts-de-Seine, France

Reinforcement arrangement for heat exchangers

The invention relates to an arrangement for reinforcing the connection between pipes and collecting tanks in the case of heat exchangers which have tubes with an approximately rectangular cross-section, the ends of which with the pipelines the sump limiting flanges are engaged.

In the manufacture of heat exchangers, in which the tubes are inserted into the collecting tanks, one goes

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usually so that the pipe ends are "flared", with mandrels inserted into the conduit bounded by each pipe in order to lay the outer wall of these pipes well against the puddles normally bounding the pipes provided in each sump.

This operation that is used to machine every pipe opening and serves to facilitate the subsequent soldering or welding process, in which the pipes with the Splashing and being connected to the collecting tanks does not allow a fixed mechanical connection between the pipes and the collecting tanks is ensured as long as the heat exchanger is not welded is, and it often happens that with further handling of the heat exchanger, the collecting tanks are moved from their ideal position, which they should normally occupy.

In addition, with finished heat exchangers, i.e. after completion of the welding process, all mechanical loads, that can occur between the pipes and the collecting tanks, solely from the welds recorded.

The object of the invention is thus to ensure a mechanical fastening of the tubes on the 'heat exchangers, the distance between the collecting tanks remaining essentially unchanged for each further treatment or handling .before welding, so that any risk of displacement of the collecting tank is eliminated . In addition, better working conditions are given when welding the collecting tanks on the pipes ₃ while the connection itself is much stronger than previously usual.

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According to the invention, this object is achieved with a device of the type mentioned in that the ends the pipes are arranged so that they are above the pool survive during engagement, and that the two long sides of each tube are bent and rolled around the flanges are.

Further features of the invention emerge from the following description emerged.

An embodiment of the invention will now be described and explained in more detail with reference to the accompanying drawing. Show it:

Pig. 1 is a plan view of a collecting tank of a heat exchanger in which the invention attached pipes lead into;

Fig. 2 is a sectional view along the line II-II from Pig. Ij

3 shows a cross section along the line III-III Fig. 1, and

FIG. 4 is a sectional view similar to FIG. 3 with the illustration a further development of the invention.

The drawing shows a collecting tank 1 of a heat exchanger, for example a cooler. This collecting container is designed in such a way that it is surrounded by flanges 2 Pipelines limited. The ends of the tubes 3 are in communication with the space delimited by the flanges 2 and - as can be seen from the drawing - have a substantially rectangular cross-section and lie

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closely to the inner wall of the pool 2. Are the Pipes with the puddles according to the invention in engagement, so its section 3a extends beyond the pool and is introduced into each pipe end by means of one Tool widened, with the long edges of each tube bent outwards and then around the corresponding one Sections of the paddles 2 are rolled (see FIG. 3b). A tool suitable for this work process can look roughly as shown schematically by dash-dotted lines under the reference number 4 in FIG. 3.

When the tool 4 cuts the pipe in the aforementioned manner and If it expands and rolls in a manner, it naturally exerts pressure on the pipe, causing it to be underneath the collecting container 1 is expanded, as shown in enlarged form by the extension 3c. Polly the splash 2 which delimits each pipeline 3 becomes in this way also between the rolled edges 3b attached to the long edges of the tubes and the extension 3c, creating a solid mechanical connection is ensured between the pipes and the collecting tanks.

If the heat exchanger is now welded or soldered, as is always the case, the molten soft solder tends to be attracted due to the capillary action in the cavities formed between the flanges and the walls of each pipe; the molten soft solder is held in particular in the rolled sections 3b, so that the final connection between the tubes and the collecting containers is particularly good.

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As can now be seen from Fig. 3, it happens when Roll up the sections 3b often that the pipe openings are slightly narrowed, as shown under reference numeral 3d. It actually causes the sections to curl 3b a reduction in the cross section of the tube metal, whereby the walls on the long sides are closer to each other.

Fig. 4 shows a further development of the invention which this disadvantage is avoided. A tool 5 is used for this purpose, which for example can be designed as shown in phantom in the drawing; it points to his both sides at an angle 5a, thus making the sections 3e of the long sides are bent so that they form a sharp angle at the height of the apex of the flanges 2 3f form. Then the tool inserted further down causes the ends 3b to be rolled up as before, thereby obviously increasing the moment of inertia of the pipe and consequently the formation of the constriction 3d shown in FIG. 3 is prevented. The extension 3c is advantageously also shown in FIG Way., Formed so that the mechanical connection between the pipes and the collecting tanks is still is improved more than was described in connection with FIG. The dimension by which the sections 3b be rolled, can be selected as required so that the rolled portion 3b over a short distance comes into contact with the top of the heat exchanger, as in 3b. is shown in FIG.

The invention is in no way limited to the exemplary embodiment described and illustrated in detail above limited, but various modifications are possible within the scope of the invention.

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Claims (5)

P a t en t claims 1. J arrangement for strengthening the connection between pipes and collecting tanks in heat exchangers, which have pipes with an approximately rectangular cross-section, the ends of which are in engagement with the pipelines of the collecting tank delimiting splash, characterized in that the ends of the pipes (3) are arranged are that they protrude over the pool 2 during engagement, and that the two long sides of each tube (3) are bent and rolled around the pool (2) » 2. Arrangement according to claim 1, characterized g e indicates that an extension (3c) in the wall of the tubes (3) beyond the side, too which the rolled sections (3b) of the long sides of the Pipes (3) are directed, opposite side of the The collecting container (1) is designed so that the collecting container are clamped between the extension (3c) and the rolled section (3b) of the tubes. 3. Arrangement according to claim 1 or 2, characterized marked that the end of the rolled section C3b) of the tubes up to the level of the Collection container (1) extends. 4., Arrangement according to one of the preceding claims, characterized g e k e η η ζ e i c h η e t that a .A fold forming a sharp angle (3f) at least in the longitudinal sides of the tubes (3) is formed at a height corresponding to the apex of the planch (2), so that the free section extending beyond the fold the long sides is rolled around the corresponding section of the flange (2). 3Ö9845 / & 943 5. Arrangement according to one of the preceding Claims, characterized in that the formation of the rolled sections (3b) and the extensions (3c) before welding or soldering the Pipes (3) in the collecting tanks (1) takes place so that the rolled sections (3b) form cavities for receiving the hard or soft solder. 309845/0943 L e r s e i t e