DE19752475A1 - Method for manufacturing laminated heat exchanger - Google Patents

Abstract

The method involves a core being formed by connected pipes in several levels and end plates being connected via ribs on one or both sides. An end plate has a projecting section, with at least one curved edge extending in longitudinal direction from an outer or inner surface. The core consists of first pipe elements with a pair of tanks, connected by a heat exchanger medium channel, and the tanks connected to neighbouring tanks. A second similar element has one tank not connected to a neighbouring tank and so as to act as a divider plate. Third pipe elements have an intake/discharge element on one tank. Tanks and channel of a fourth element have a capacity for an exchanger medium, which is half the size of the first pipe element capacity.

Description

The present invention relates to a method for producing a plate-like or layered heat exchanger, for example in an air conditioning system can be used in vehicles or the like and by alternating Layered arrangement of pipe elements and fins over a plurality of Levels is formed, with an end plate at least at one end in the direction the layered arrangement or layering is provided. In particular concerns the present invention a method according to the preamble of claim 1.

Prior art multilayered heat exchangers include, for example, that disclosed in Japanese Unexamined Utility Model Publication No. H1-157963. This multilayer heat exchanger is made by layering arrangement of tubular coolant flow channels (Rohrele elements), each of which is formed by connecting a pair of opposing or facing mold plates, with tank sections being formed at one end thereof, alternately with lamellar or corrugated fins, such as shown in Fig. 9, wherein an end plate 100 and a tubular member 102 which is provided at one end in the direction of arrangement schichtwei sen having a flat shape plate 101 are connected via ribs 103rd

The end part can be fastened in the direction of the layered arrangement of this multilayer heat exchanger by carrying out the steps described below. First, a provisional assembly is carried out, the ribs 103 are inserted into a recessed part 104 of the end plate shown in FIG. 10, which is held in the left hand, and then the flat mold plate 101 is placed over it. Then, as shown in FIG. 11, both ends are inserted in the longitudinal direction in grooves 106 of a stacking plate 105 and held therein. Thereafter, the end plate 100 and the flat mold plate 101 are clamped by clamping with two protruding parts of a robot (not shown). If the parts for the two side parts of the multilayer heat exchanger are preassembled in the direction of the layered arrangement, the assembly of the two end parts of the multilayer heat exchanger in the direction of the layered arrangement can be carried out simply by removing these parts from the stacking plates and during the manufacture of the heat exchanger connected to the heat exchanger core.

In addition, it is noted that the thickness of the prior art end plate 100 is typically about 1 mm, but in recent years there has been an increasing demand to reduce the thickness to about 0.6 mm, for example, in order to reduce the production cost of multi-layer Keep heat exchangers low and get a lighter multi-layer heat exchanger. However, if the thickness of the end plate 100 is simply reduced, the strength of the end plate 100 is also reduced.

However, since a plurality of end plates 100 are stacked one on top of the other to facilitate transportation, if the end plates 100 are manufactured elsewhere and then transported to the multilayer heat exchanger production line, the end plates 100 tend to be lost due to this loss of strength To wave or bend in the direction in which they are not connected when they are removed one by one. As a result, the distance between the end plate 100 and the flat mold plate 101 becomes larger than the distance between the two protruding parts of the robot, with the consequent problem that the robot cannot clamp the end plate 100 and the mold plate 101 .

Furthermore, there are concerns that when the end plate 100 and the flat mold plate 101 are temporarily assembled manually as described above, the part of the end plate 100 that is held by hand, for example, may deform, resulting in the distance between of the end plate 100 and the flat mold plate 101 becomes larger than the distance between the two protruding parts of the robot, so that the robot cannot clamp the end plate 100 and the flat mold plate 101 .

To solve the problems described above, even with a reduced thickness of the end plate 100, the strength of the end plate 100 can be improved by forming a flange 107 by bending the edge portion of the end plate 100 toward the inside toward the layered arrangement, as shown in FIG. 12 .

In addition, as shown in FIGS. 13A and 13B, the strength of the end plate 100 can be formed by forming beads 108 that protrude toward the outside in the layered arrangement of the heat exchanger, or beads 109 that toward the inside protruding layered arrangement of the heat exchanger from the end plate 100 can be improved.

In the first described construction of the end plate 100 , which is shown in Fig. 12 Darge, however, there arises the problem that the air flow cross section in the heat exchanger is reduced by the width of the flange 107 , which results in a reduced heat exchange capacity of the heat exchanger.

Further, the second construction of the end plate 100 shown in FIG. 13A may cause a problem in installing the heat exchanger since the width of the multi-layer heat exchanger increases in the direction of the layered arrangement with the sic 108 that are formed so that they protrude to the outside in the direction of the layered arrangement. In addition, the construction of the end plate 100 shown in FIG. 13B poses a problem because the beads 109 , which are formed to protrude toward the inside toward the layered arrangement, make it difficult to form a reliable connection with the ribs 103 when the end plate 100 and the flat front plate 101 are temporarily assembled over the ribs 103 .

The present invention is therefore based on the object of a method for To create a stratified heat exchanger in which even with ver reduced thickness of the end plate compared to the prior art a bending or Deformation of the end plate is prevented, at least until the end plate and the flat one Front panel are clamped with a robot, the dimensions of the heat not in the direction of the stratification after finishing the furnace (hard) soldering are larger.

The above object is achieved by a method according to claim 1. Beneficial Further training is the subject of the subclaims.

In particular, the method for producing a multilayer heat rope comprises schers, the first mold plates for the formation of heat exchange medium channels, a second flat mold plate, an end plate ver with a protruding portion is seen, which runs in the longitudinal direction of the end plate and on its outer surface or  is formed on its inner surface and has one or more bending edges, and corrugated (corrugated) fins, a step in which one Arrangement is provisionally mounted so that the first tubular elements, each by connecting two first mold plates facing each other alternating with the ribs over a plurality of levels in layers be ordered and that a second pipe element, which by connecting a first Form plate and an opposite second mold plate is formed so that the second mold plate is on the outside, and an end plate is at the end of the layered arrangement or on the outer second, in particular fla Chen mold plate is positioned, and a step in which the arrangement of the both sides or ends in the direction of the layered arrangement or layer tion is pressed together and brazing is carried out in an oven in the meantime the compressed state is maintained.

The protruding portion of the end plate is pressed together and the Influence of heat flattened. In other words, the end plate facing the front standing section until the arrangement by provisional assembly of the multilayer heat exchanger is ready for brazing in the furnace becomes flat (pressed) during furnace brazing.

Since the end plate has a bending edge or one at least up to the furnace brazing maintains the protruding portion with one or more bending edges extending longitudinally on its outer surface or its inner surface is its fes guaranteed activity, even if the thickness of the end plate compared to the state of the Technique is reduced, and therefore an end plate is removed from a stack that contains a plurality of end plates is neither bent nor deformed, when it is held by hand.

Because the protruding part of the end plate flattened during brazing in the furnace , the width of the heat exchanger increases in the direction of the layered arrangement layering and stratification, and the connection with the ribs is not relieved partly influenced. Furthermore, there is a sufficient air flow cross section in the heat exchanger guaranteed.  

The above and other features of the invention and accompanying accompanying parts are connecte to the person skilled in the art in view of the following description dung with the accompanying drawing, which shows preferred embodiments, more understandable and obvious. It shows:

Fig. 1A is a plan view showing a heat exchanger with an end plate according to the prior invention;

Fig. 1B is a front view of the heat exchanger gem. Fig. 1A;

Fig. 1C is a bottom view of the heat exchanger gem. Fig. 1A;

2A is a plan view of the present invention showing the structure of the end plate in accordance with which is provided with a projecting portion which projects to the outside in the direction of the layered arrangement.

Fig. 2B is a side view of the endplate gem. Fig. 2A;

Fig. 3 is a perspective view showing the structure of a part which is obtained by mounting the above end plate on a flat mold plate over ribs;

Fig. 4 shows a step in which the heat exchanger shown in Figures 1A, 1B and 1C is brazed in an oven, being fi xed with jigs.

Fig. 5 is a perspective view showing the structure of an end plate, which differs from the end plate shown in Figs. 2A and 2B and is also provided with a protruding portion which protrudes to the outside in the direction of the layered arrangement;

Fig. 6A is a perspective view showing an end plate, wherein the projecting portion of the end plate and 2B protrudes in Fig 2A to the inside in the direction of the layered arrangement.

Fig. 6B is a perspective view showing an end plate in which the protruding portion of the end plate shown in Fig. 5 protrudes toward the inner side in the layered arrangement direction;

Fig. 7A is a plan view showing a heat exchanger with a different structure of the bent parts and tanks than in the heat exchanger shown in Figs. 1A, 1B and 1C from above;

FIG. 7B is a front view of the heat exchanger gem. Fig. 7A;

Fig. 7C is a bottom view of the heat exchanger gem. Fig. 7A;

Fig. 8A is a plan view showing a heat exchanger from above, the inlet / outlet elements of which are positioned in a different manner than the inlet / outlet elements of the heat exchanger shown in Figs. 1A, 1B and 1C;

FIG. 8B is a front view of the heat exchanger gem. Fig. 8A;

Fig. 8C is a bottom view of the heat exchanger gem. Fig. 8A;

9 is a perspective view of one end of a heat exchanger according to the prior art.

Fig. 10 is a perspective view showing the structure of an end plate, the Rip pen and a flat mold plate, which form an end portion of the heat exchanger according to the prior art in the direction of the stratification;

11 is a perspective view showing a step in which the part that is obtained by the assembly of the end plate, the fin and the flat plate shape, is inserted into a stacking plate.

Fig. 12 is a perspective view showing a structure in which a flange is formed to reduce the thickness of the end plate;

FIG. 13A, are formed at the corrugations on the outer side in the direction of lamination to reduce the thickness of the end plate is a perspective view showing a structure; and

FIG. 13B, are formed in the beading on the inside in the direction of lamination to reduce the thickness of the end plate is a perspective view showing a structure according to the prior Technique.

The following is an explanation of preferred embodiments of the present invention with reference to the drawing.

Fig. 1A, 1B and 1C show a plate-shaped or laminated heat exchanger 1, the o, for example, as an evaporator in an air conditioning system for vehicles or an air conditioner. Like. Can be used. This heat exchanger 1 comprises pipe elements 2 , 3 , 4 and 5 , lamellar or corrugated ribs 6 and end plates 7 .

The tubular elements 2 are each formed by connecting two mutually facing th form plates 2 a, which are in particular coated with a brazing material. Each pipe element 2 comprises two tanks 8 formed at one end in the longitudinal direction and a U-shaped heat exchange medium channel 9 which connects the tanks 8 so that heat exchange medium moves from one of the tanks 8 through the heat exchange medium channel 9 to the other Stream tank 8 . Each tank 8 is provided with a connection opening (not shown) on both sides of the tubular element 2 in the direction of the stratification, so that it is in the connected state with adjacent tanks to form tank groups A and B.

A pipe element 3 , which is approximately identical to the pipe elements 2 , is arranged approximately in the middle of the heat exchanger 1 in the direction of the stratification in order to divide the tank group A, which has inlet / outlet elements 11 , into an inlet side and an outlet side. For this purpose, the tubular element 3 has a blind tank 10 , ie the tank has only one connection opening or a closed connection opening on the side where the inlet / outlet elements are formed.

Furthermore, tubular elements 4 are provided with an inlet / outlet element 11 which projects from a tank 8 of the tubular element 2 upwards. The tubular elements 4 are in particular in the middle of the inlet side and the outlet side of the tank group A angeord net, which is divided by the tubular element 3 to form a heat exchange medium inlet and a heat exchange medium outlet.

Pipe elements 5 are each arranged on one side of the multilayer heat exchanger and their shape is achieved by halving the previously described pipe elements 2 . In other words, the tubular elements 5 , each of which is formed by binding a shaped plate 2 a, which is used to form the tubular elements 2 , and an opposite flat shaped plate 2 b, are with tanks 8 a, de ren capacity half as large as that of the tanks 8 , and a heat exchange medium channel 9 a, the capacity or volume of which is half as large as that of the heat exchange medium channel 9 .

The fins or ribs 6 are provided between the tubular elements 2 to 5 and between the tubular elements 5 and end plates 7 and are provided by the tanks 8 at one end and by bent parts 12 which are made by bending out the end parts of the tubular elements 2 , 3 , 4 and 5 are formed, held at the other end, as shown in Figs. 1A and B.

The end plates 7 are arranged on the outside of the tubular elements 5 in the direction of the layer device and their thickness is preferably about 0.6 mm. This thickness is less than that of an end plate according to the prior art, the thickness of which is approximately 1 mm.

If the pipe elements 2 , 3 , 4 and 5 , which have the construction described above, are connected, a 4-course heat exchange medium flow path for the heat exchanger 1 is achieved.

It must be noted that the end plates 7 according to a flat side surface in the heat exchanger 1 . Fig. 1A, 1B and 1C have showing a finished heat exchanger 1, the end plates 7, but initially provided with a front projecting portion 13, as shown in Fig. 2A and 2B.

As shown in Fig. 2A, the projecting portion 13 is provided with a rectangular bending edge 14 , the four sides of two parallel bending edges 14 a, which extend in the longitudinal direction on a side surface of the end plate 7 , and two parallel bending edges 14 b, which Extend in the direction of the short side on the side surface of the end plate 7 , as well as with a ridge bending edge 15 which extends parallel to the bending edges 14 a within the frame of the rectangular bending edge 14 , and with bending edges 16 which extend from the two ends of the bending edge 15 to the corner or contact points of the bending edges 14 a and 14 b of the bending edge 14 extend (that is, to the corners of the bending edge 14 ). By forming the bending edge 14 as Talbie supply and the bending edge 15 and 16 as a mountain bend, the above section 13 protrudes, for example, 1 mm to the outside, being gently inclined toward the outside in the direction of the stratification with the bending edge 16 as the apex of the slope . It should be noted that the projecting section 13 is preferably made by pressing or deep drawing.

An example of a manufacturing method for manufacturing the heat exchanger 1 using the end plate 7 , which is constructed as described above, will be described below with reference to FIGS . 3 and 4. It should be noted that the steps identical to those in the preparation of the prior art example will be explained with reference to the drawings showing the prior art steps.

First, ribs 6 are arranged in a recessed part 17 of the end plate 7 , and then the flat mold plate 2 b is placed over it, thereby forming a part 19 , which is shown in Fig. 3 and represents a provisional arrangement. Thereafter, as in the step of the prior art, the two ends of the provisionally assembled part 19 are inserted and held in grooves 106 of a stacking plate 105 shown in Fig. 11 in the direction of the short side. Then the part 19 is clamped and clamped by two protruding parts of a robot (not shown), so that the part 19 , which forms a side part of the multilayer heat exchanger 1 in the direction of the stratification, is preassembled. Then, during the assembly process of the heat exchanger 1, the part 19 is taken from the stack plate 105 and connected to the other pipe elements 2 , 3 , 4 and 5 , so that a provisional arrangement 20 of the heat exchanger is formed. It must be noted that the projecting portion 13 of the end plate 7 protrudes outward in the direction of the stratification.

Then, after the assembly 20 of the heat exchanger 1 has been washed or cleaned or degreased, the assembly 20 of the heat exchanger 1 is fixed by clamping on both sides in the direction of the stratification with contact clamping devices 21 and 22 and by attaching square, frame-shaped fastening devices 23 and 24 on the outside of the contact clamping devices 21 and 22 , as shown in Fig. 4, fixed. It must be noted that during the process in which the tensioning devices 21 , 22 , 23 and 24 are fastened, the arrangement 20 of the heat exchanger 1 from both sides in the direction of the layered arrangement with a force of approximately 1 ton, ie approximately 9.81 kN, is pressed together.

Then, the assembly 20 of the heat exchanger 1, the shown, inserted through the Spannvorrichtun gen 21, 22, was fixed 23 and 24 in a furnace 25 and brazed in the oven 25 as shown in Fig. 4, in order to in Fig. 1A, 1B and 1C to obtain heat exchanger 1 . While the protruding portion 13 of the end plate 7 is flattened, since the pressure exerted from the both sides in the direction of the stratification and the heat existing in the furnace 25 (about 600 to 700 ° C) decrease the resistance to deformation and lead to an increase in the plasticity of the raw material, the bending edges 14 , 15 and 16 are retained to such an extent that they are recognizable.

Thus, since the end plate 7 retains the protruding portion 13 until the assembly 20 obtained through the provisional assembly of the heat exchanger 1 is soldered together in the furnace 25 , its strength is guaranteed even if the thickness of the end plate 7 is 0.6 mm is reduced, that is, to a thickness which is less than that of the product according to the prior art.

In addition, since the protruding portion 13 of the end plate 7 is flattened after the arrangement 20 of the heat exchanger 1 has been soldered together in the furnace 25 to complete the heat exchanger 1 , the width or expansion of the heat exchanger 1 in the direction of the stratification does not increase and there is no obstacle when installing the heat exchanger 1 .

Since the bending edges 14 to 16 remain on the end plate 7 , the part is also achieved before that it can subsequently be determined whether a heat exchanger has been produced according to the proposed method. This is important, for example, when assessing failures or damage.

It should be noted that the shape of the protruding portion of the end plate 7 is not limited to that of the protruding portion 13 shown in FIG. 3, and a protruding portion 26 may be provided instead, which as in FIG. 5 shown is shaped.

This protruding portion 26 is with a rectangular bending edge 14 , the four sides of two parallel bending edges 14 a, which extend in the longitudinal direction on a side surface of the end plate 7 , and two parallel bending edges 14 b, which are in the direction of the short side extend on the side surface of the end plate 7 , with a rectangular bending edge 27 , the four sides of bending edges 27 a, which extend parallel to the bending edges 14 a, and consist of bending edges 27 b, which are parallel to the bending edges 14 b in the Extend the frame of the rectangular bending edge 14 , and provided with bending edges 16 , which connect the corners of the bending edge 14 and the corners of the bending edge 27 , respectively. Since the bend edge 14 is formed as a valley bend and the bend edges 16 and 27 as mountain bends, the rectangular part which is surrounded by the bend edge 27 in the projecting part 26 protrudes 1 mm outwards, for example, with a gentle inclination to the outside in the direction of the stratification. The above section 26 is preferably made by press machining or deep drawing.

While the protruding portion 13 and the protruding portion 26 of the end plate 7 in Fig. 3 and Fig. 5 upstream to the outside in the direction of lamination to the outside and SEN are formed to protrude, the protruding portion 13 or the projecting portion 26 may be further formed to protrude toward the inside in the direction of the stratification, as shown in Figs. 6A and 6B. Here, the projecting section 13 protrudes toward the inside in the direction of the stratification, the bending edge 14 being designed as a mountain bend and the bending edges 15 and 16 as a valley bend, and the projecting section 27 protrudes toward the inside in the direction of the stratification, the Bending edge 14 as a mountain bend and the bending edges 16 and 27 are formed as valley bends. In these cases, the protruding portions also protrude, for example, about 1 mm, as was the case with the protruding portions protruding outward in the direction of the stratification, and the protruding portions 13 and 26 can also be made by pressing or deep drawing.

Furthermore, the construction of the heat exchanger 1 is not limited to that shown in FIGS. 1A, 1B and 1C and can have any construction as long as the end plate 7 is provided at least on one or both sides in the direction of the stratification. Examples of such a heat exchanger are explained with reference to Figs. 7A, 7B, 7C, 8A, 8B and 8C. The design features that are identical to those of the heat exchanger 1 shown in FIGS. 1A, 1B and 1C are given the same reference numerals and will not be explained.

In Fig. 7A, 7B and 7C are the bent portions 12 which are formed at the tube elements 2, 3, 4 and 5 a heat exchanger 28, respectively, by continuous joining of upper pieces 12 a with the lower pieces 12 b at positions in ei ner level below the upper pieces 12 a are formed, as shown in Fig. 7A, and thus each curved part 12 is seen with recesses and projections. In addition, each lower piece 12 b, which is seen between upper pieces 12 a before, is formed with such a shape that its width gradually decreases from the side, where it is continuously connected to one of the upper pieces 12 a, towards the center and then its width gradually increases again from the center to the side where it is continuously connected to one of the upper pieces 12 a. Furthermore, as shown in FIG. 7C, the expansion of the tanks 8 in the direction of the air flow is larger than that of the tanks shown in FIG. 1C, whereby the distance between the tanks 8 is reduced.

FIGS. 8A, 8B and 8C show a construction in which the inlet / outlet members 11 ei nes heat exchanger 29 are provided on one side in the direction of layering.

In other words, this heat exchanger 29 is provided with a tubular element 30 at a certain desired position, which has a tank 31 , the width of which in the direction of the air flow is greater than that of the tank 8 and which extends between the tank groups A and B. In addition, an expanded plate 32 is provided on one side in the direction of the stratification, in which a pair of expanded parts 33 and 34 for forming heat exchange medium channels 35 and 36 is formed. This expanded plate 32 forms the heat exchange medium channels 35 and 36 when connected to a tubular element 5 , and the inlet / outlet elements 11 are seen on the heat exchange medium channels 35 and 36 before. An opening 37 is provided in the expanded plate 32 , and by inserting one end of a connecting pipe 38 , the other end of which is inserted into the tank 31 , into the opening 37 , the heat exchange medium channel 35 and the tank 31 are connected to each other.

Thus, the end plate 7 is attached only on the side opposite the inlet / outlet elements 11 in the direction of the stratification.

Since, according to the present invention, as previously explained, the end plate with egg nem protruding portion is provided, the one or more bending edges has, which extend in the longitudinal direction and outwards or inwards in layer project direction until the arrangement, which is determined by the provisional cooperation When the heat exchanger is built, is brazed in the furnace, the Festig guaranteed end plate, even if its thickness compared to the state of the Technology is reduced. As a result, an end plate becomes a stack of end plates is not bent, or an end plate is not deformed when in is held by hand, ensuring that it is different from the foregoing Parts of a robot can be easily clamped.

In addition, according to the present invention, the foregoing section of the End plate is flattened after brazing in the furnace, takes up the width of the multilayer heat exchanger in the direction of the stratification and the Ver binding with the ribs is not adversely affected. Furthermore, an additional Advantage achieved because a large air flow cross-section guarantees in the heat exchanger is.

Claims (12)

1. A method of making a layered heat exchanger comprising:
a step in which a core of the heat exchanger is formed by connecting a plurality of pipe members over a plurality of levels, providing fins between the pipe members;
a step in which an assembly is formed by attaching an end plate to a tubular member at one end via fins on both sides or on one side of the core of the heat exchanger in the stratification direction; and
a step in which the assembly is pressed from both sides in the direction of the layer and brazed in an oven while maintaining the compressed state;
characterized by
that the end plate is provided with a protruding portion which has at least one bending edge which extends in a longitudinal direction on an outer or inner surface thereof. 2. The method according to claim 1, characterized in that the core of the heat exchanger is formed by the following elements:
first tube elements each having a pair of tanks and a heat exchange medium channel connecting the tanks, the tanks being connected to tanks of adjacent tube elements;
a second pipe member having a pair of tanks and a heat exchange medium passage connecting the tanks, one of the tanks not communicating with a tank of an adjacent pipe member so as to serve as a partition plate;
third tube members each having a pair of tanks and a heat exchange medium passage connecting the tanks with an inlet / outlet member projecting from one of the tanks in the direction of the air flow; and
a fourth pipe element with a pair of tanks and a heat exchange medium channel connecting the tanks, the tanks communicating with tanks of adjacent pipe elements and the tanks and the heat exchange medium channel having capacities for heat exchange medium that are half the capacities of the tanks and are the heat exchange medium channels of the first tubular elements. 3. The method according to claim 2, characterized in that the fourth Rohrele ment on both sides of the core of the heat exchanger towards the layer device is provided, the end plate on the outside of the fourth tube elements is provided at both ends in the direction of the stratification. 4. The method according to claim 1, characterized in that the core of the heat exchanger is formed by the following elements:
first tube elements each having a pair of tanks and a heat exchange medium channel connecting the tanks, the tanks being connected to tanks of adjacent tube elements;
a second pipe member having a pair of tanks and a heat exchange medium passage connecting the tanks, one of the tanks not communicating with a tank of an adjacent pipe member so as to serve as a partition plate;
a third tubular member having a pair of tanks and a heat exchange medium passage connecting the tanks, the width of one of the tanks being increased in the direction of air flow; and
a fourth pipe element with a pair of tanks and a heat exchange medium channel connecting the tanks, the tanks communicating with tanks of adjacent pipe elements and the tanks and the heat exchange medium channel having heat exchange medium capacities that are half the capacity of the tanks and the heat exchange medium are channels of the first tubular elements. 5. The method according to claim 4, characterized in that the fourth Rohrele ment on both sides of the core of the heat exchanger towards the layer  device is provided, with an expanded plate with inlet / outlet elements ten on the outside of the fourth tubular element at one end in the direction of Stratification is provided around a pair of heat exchange medium channels to form, wherein a connecting pipe one of the heat exchange medium channels connected to the tank increased width of the third tubular element and the End plate on the outside of the fourth tubular element at the other end in Direction of stratification is provided. 6. The method according to any one of claims 1 to 5, characterized in that the the above section by compressing and applying heat, esp especially when soldering the heat exchanger together, especially when together men soldering the heat exchanger, is flattened. 7. The method according to any one of claims 1 to 6, characterized in that the projecting section further with a rectangular bending edge, the four Sides from two parallel bending edges that extend in a longitudinal direction extend a side surface of the end plate, and two parallel bending ridges those that are in the direction of the short side on the side surface of the end plate extend, exist, with a ridge bending edge that is parallel to the in Longitudinally extending bending edges of the end plate within a Frame of the rectangular bending edge extends, and with four bending edges that extend from two ends of the edge of the ridge to the Extend corners of the rectangular bend. 8. The method according to claim 7, characterized in that the rectangular bie edge as the valley bend and the ridge bend edge and the bend edges, that the ridge bend edge and the corners of the rectangular bend edge connect, are formed as mountain bends, so that the above Ab cut with the edge of the ridge as an apex towards the outside Layering protrudes. 9. The method according to claim 7, characterized in that the rectangular bie edge as a mountain bend and the ridge bend edge and the bend edges, that the ridge bend edge and the corners of the rectangular bend edge  connect, are formed as valley bends, so that the above Ab cut with the edge of the ridge as an apex inward towards the Layering protrudes. 10. The method according to any one of claims 1 to 6, characterized in that the projecting section further with an outer rectangular bending edge, whose four sides consist of two parallel bending edges, which form a longitudinal extend direction on one side surface of the end plate, and two parallel Bending edges that are in the direction of the short side on the side surface extend the end plate, exist, with a within a frame of the outer outer rectangular bending edge arranged inner rectangular bie edge, the four sides of which consist of two parallel bending edges, which are in extend the longitudinal direction of the end plate on one of its side surfaces, and two parallel bending edges, which are in the direction of the short side of the Extend side surface of the end plate, exist, and ver with bending edges will see which corners of the outer rectangular bend with corners of the inner rectangular edge of the bend. 11. The method according to claim 10, characterized in that the outer right c angular bending edge as valley bend and the inner rectangular bending edge and the bend edges, which are the corners of the outer rectangular bend edge and connect the corners of the inner rectangular bending edge as Mountain bends are formed so that the projecting section with a Area surrounded by the inner rectangular edge of the bend as shea protrudes outwards in the direction of the stratification. 12. The method according to claim 10, characterized in that the outer right c square bending edge as a mountain bend and the inner rectangular bending edge and the bend edges, which are the corners of the outer rectangular bend edge and connect the corners of the inner rectangular bending edge as Valley bends are formed so that the projecting section with a Area surrounded by the inner rectangular edge of the bend as shea protrudes inwards towards the stratification.