DE4244017B4 - Heat exchangers, in particular for motor vehicles - Google Patents

Abstract

Heat exchangers, in particular for motor vehicles,
comprising a tube plate (5) and a water tank (6) made of plastic with a partition wall (9),
wherein the tubesheet (5) is attached in a liquid-tight manner to the water box (6),
in that a welding surface (11, 31, 41) circulating in the edge region (5 ') of the tube bottom (5) has a complementary welding surface (21, 33, 43) of the water box (6) and a further welding surface (51) of the tube plate (5). with a complementary welding surface (53) of the partition wall (9) are vibration-welded, wherein the welding surfaces (21, 33, 43, 53) on the water box (6) and / or on the partition wall (9) obliquely to the pressure direction (P) extending guide surfaces ( 22, 34 a, 34 b, 44 a, 44 b, 54 a, 54 b) and the corresponding welding surfaces (11, 31, 41, 51) obliquely to the pressure direction (P) extending centering surfaces (12, 32 a, 32 b, 42 a, 42 b, 52 a, 52b).

Description

The The invention relates to a heat exchanger, in particular for motor vehicles, having a tube plate and a plastic water tank, wherein the tube sheet is liquid-tight attached to the water box.

Such a heat exchanger is from the DE 32 47 502 A1 known. The arranged in the edge region of the tubesheet welding surface is hierbai designed as a continuous flat surface. The water tank has an extended edge, which is provided on the side facing the tube sheet with a functioning as a welding surface flat continuous surface. The welding surface of the tubesheet and the water box is limited on the outside and the water box inside through serving as Schweißgratspeicher grooves. The tube sheet has a shoulder disposed adjacent to the inner groove and extending in the longitudinal direction of the water box, against which the edge of the water box rests and is guided longitudinally displaceably thereon.

Of the known heat exchanger has the disadvantage that in the proposed leadership of the water box by means of as a guide element acting shoulder of the tube sheet only a partial overlap the cooperating welding surfaces occur can. As a result, the vibration welding is effectively available Shrinking area, whereby the welding quality is clear is reduced. Besides that is it in the known heat exchanger Required that the water box position accurately on the tubesheet must be set up before his shoulder her leadership function fulfill can. This exact placement of the water box on the tubesheet is in many cases but not possible there water boxes production or storage due often sunken or curved walls exhibit. The edge of the water box foot can therefore not on the Shoulder of the tubesheet are pushed so that putting on of the water box on the tubesheet - if at all - be carried out only very inaccurate can.

The DE 37 33 866 A1 describes a heat exchanger with a tube bottom made of plastic. The known heat exchanger is equipped with pipes inserted and also made of plastic water tank. The tubesheet is connected to the water box by vibration welding. The DE 38 35 640 A1 describes a method for the positive connection of two molded parts, wherein at least one of the molded parts consists of a thermoplastic material. The DE 32 47 502 A1 relates to a heat exchanger, which consists of a plurality of tubes and transverse to these arranged ribs heat exchanger block and at least one existing plastic tube plate and water tank. The tube sheet has openings for receiving the ends of the tubes, and the water box is fixed liquid-tight on the tube sheet. In order to achieve a simple and reliable connection of the heat exchanger tubes with the tubesheet and the water box with the tubesheet, it is proposed that the plastic tube bottom has elevations on one side, in which the openings are located and the ends of the tubes by means of widening in the radial direction or pressing are fixed in the axial direction on the tube sheet. Each at the edges of the tube sheet and the water tank is provided with flat surfaces which lie on one another, and the tube sheet is connected to the water tank by means of vibration welding to these flat surfaces. The DE 91 07 174 U1 relates to a water tank for a heat exchanger. The water tank consists of a hood-shaped main body whose interior is divided by at least one arranged in the base body partition in chambers and with a liquid-tight by friction welding on the base body and the partition to be fixed pipe bottom. At the tube bottom, a tube bundle of the heat exchanger is connected. The partition wall has on its longitudinal edge facing the tube plate in the longitudinal direction of the partition wall in a row at a distance one behind the other, peg-shaped elevations projecting beyond an imaginary dividing plane between partition and tube sheet.

One Another disadvantage of the known heat exchanger is that to the leadership the water box on the tubesheet during the vibration welding process required shoulder additional Space occupied. this leads to in a disadvantageous way that - given external dimensions - either the for the arrangement of the welding surfaces for disposal standing space or the usable interior of the water box reduced becomes.

The Invention is therefore the task, starting from the beginning mentioned heat exchanger a heat exchanger to create, with regard to the vibration welding of tubesheet and water tank requirements occurring is improved.

These Task is with a heat exchanger solved, having the features of claim 1.

By the measures according to the invention will created in an advantageous manner, a heat exchanger at that both a flawless leadership the water box on the tubesheet as well as a compact design the one to the leadership the water box during required for vibration welding Connection arrangement is ensured. By inventively provided and oblique to the pressure direction of the water box on the tube bottom extending centering is achieved in an advantageous manner that even with dimensional tolerances of water tank and tube bottom a congruent covering of the two cooperating Given welding surfaces is, as the oblique centering according to the invention in conjunction with the guide surface according to the invention a Alignment of assigned parts of the water tank and the tube bottom causes. This makes it possible in an advantageous manner, the Tube bottom and / or the water tank of the heat exchanger according to the invention with larger tolerances and thus cheaper to manufacture, thereby advantageously the production is simplified and therefore the production costs significantly be reduced.

One Another advantage of the heat exchanger according to the invention is that is also a water box having a sunken or crooked wall placed on the tubesheet and vibration welded can. The heat exchanger according to the invention shows - in contrast to the known heat exchanger - no arranged on the tube sheet, in a lateral distance next to the Welding surface extending shoulder to the leadership the water box at

Vibration welding on. In the heat exchanger according to the invention is the guide element as formed integral part of the welding surface, so that in advantageously a compact and the placement process the water box on the tube bottom not obstructing construction achieved becomes.

These space-saving design the one to the leadership the water box on the tubesheet required centering brings in an advantageous manner with one that - with unchanged external dimensions - either the welding surfaces of Water tank and tube plate can enlarge, thereby a better weld given these two parts, or it is possible the usable interior space of the water tank to enlarge. In addition, will through the oblique reached to the pressing direction training of the guide element of the welding surface, that with the same horizontal dimensions of the welding surfaces the effective for welding to disposal standing area is increased, resulting in an advantageous manner given an increase in welding quality is.

A advantageous development of the invention provides that the oblique centering of the welding surface in turn Water box inside area is arranged and the centering slope to the peripheral edge the sloping down of the tube bottom is executed. By this measure according to the invention is achieved that inwardly sunken walls of the water box safe and reliable by the pressurization during of vibration welding outward depressed so that a positionally accurate welding of water tank and tube sheet guaranteed is. In addition causes the outside sloping centering of the Weld surface, that the vibration welding resulting weld metal is preferably discharged to the outside. This makes it possible one arranged on the water box inside the welding surface of the tube sheet Sweat ridge memory smaller perform and to use the space gained thereby to increase the welding area. Furthermore gets less weld metal in the of the coolant perfused Interior of the water tank piped.

The in terms of Minimization of contamination of the water box caused by weld metal Requirements are thus easier to fulfill.

A Further advantageous development of the invention provides that the welding surface of the tubesheet a V-shaped centering which has a wedge-shaped shaped welding surface of the Water box cooperates. By these measures according to the invention is achieved in an advantageous manner that even a water tank with corrugated walls during vibration welding easily and reliably centered and guided can be. In an advantageous manner is thus also in one such a case for a perfect quality of welding required congruent coverage given to each other associated welding surfaces.

A Further advantageous development of the invention provides that the welding surface of the tubesheet from its base Outgoing, in sections serving as Schweißgratspeicher recesses having extending centering surfaces. Furthermore indicates the welding surface of the water box from their base outgoing guide surfaces, each to the peripheral edge and the inside of the water box extend. This measure has the advantage that the effectively available for vibration welding Welding surfaces significantly are enlarged, which achieves a high welding quality becomes.

A further advantageous development of the invention provides that for the welding of the one dividing the water tank into two chambers Partition wall with the tube bottom of this has a welding surface, which is bounded by two serving as Schweißgratspeichern wells. These measures according to the invention have the advantage that it is now also possible in the region of the dividing wall to improve the quality of the welding of the dividing wall and the tube bottom. The weld burrs provided according to the invention in the case of the partition wall seal ensure that no weld metal can enter the region through which the coolant of the heat exchanger flows, and thus into the cooling circuit, even during the welding of the partition wall.

A Further advantageous development of the invention provides that the partition formed U-shaped is. This advantageously causes a well-defined Pressure application point is given in the vibration welding of the partition, which Furthermore close to the weld the tube bottom is located, so that in an advantageous manner Buckling of the partition by the pressurization of the vibration welding process is prevented.

A Further advantageous development of the invention provides that having the partition wall associated welding surface of the tube plate webs, which run in the transverse direction to the partition wall. By these preferably in a wave-shaped Partition provided measure achieved in an advantageous manner that even with dimensional deviations Such a shaped partition a sufficiently large overlap given to each other associated welding surfaces is. The inventively provided Stages own as well the advantage that a stiffer bottom geometry of the tubesheet achieved is so that when pressurized in vibration welding no pressure curve occurs.

A Further advantageous development of the invention provides that the water box in the area of its inlet or outlet pipe longitudinal ribs or Has transverse ribs. By this measure according to the invention it is achieved that a better transfer the pressure applied to the water tank during vibration welding pressure reached from the water box top to the area of the water box foot becomes. Furthermore becomes by the transverse ribs a bending of the water box foot at vibration welding prevented, since this can no longer move laterally.

In addition, will by these ribs a collapse of the Wasserkastenfußes its production counteracted by injection molding.

A Further advantageous development of the invention provides that a stiffening resulting in an improvement in welding quality the bottom geometry of the tubesheet is achieved by this over its has entire width extending transverse struts. These cross struts own as well the advantage that thereby a cheaper injection molding production is achieved because these cross struts the flow of plastic material in injection molding Cheap influence and thus allow optimal filling of the injection mold.

Further Details of the invention can be taken from the exemplary embodiment. which will be described below with reference to the figures. Show it:

1 a schematic representation of an embodiment of a heat exchanger;

2 a first embodiment of the detail Z of 1 ;

3 a second embodiment of the detail Z of 1 ;

4 a third embodiment of the detail Z of 1 ;

5 the detail X the 1 ;

6 a plan view of the tube sheet of the heat exchanger;

7 a sectional view of a water tank of the heat exchanger;

8th a cross section through the water tank along the line VIII-VIII of 7 ;

9 another sectional view of the channel box;

10 a section through the water box along the line XX the 9 ;

11 a bottom view of another tube plate of the heat exchanger.

The in 1 schematically illustrated heat exchanger 1 consists of a pipe forks 2 and ribs 3 comprehensive heat exchanger block 4 , a tube sheet 5 and a water box 6 , The tube sheet 5 has openings 7 for receiving ends 8th the pipe forks 2 on. The water tank 6 is by a running in the longitudinal direction X and extending over its entire length partition 9 in two chambers 9a and 9b divided.

A liquid-tight connection of the pipe soil 5 and the water box 6 is due to a vibration welding of these components of the heat exchanger 1 reached. This is in on.

known manner provided that the tube sheet 5 is fixed in a fixed position by suitable means. The water tank 6 is displaced in a longitudinally vibrating motion, simultaneously from an orthogonal to the surface of the tubesheet 5 directed pressure P is applied.

Important now is the training of the vibration welding of the tubesheet 5 and the water box 6 serving connection arrangement. This is on 2 referenced in which the detail Z of 1 is shown in enlarged scale. As can be seen from this figure, the tubesheet 5 a circumferential welding surface 11 on, extending along the entire perimeter 5 ' of the tube bottom 5 extends. The circumferential welding surface 11 has a horizontally extending base 11 ' on, the integral in a direction of the pressure P an angle α enclosing inclined centering 12 the welding surface 11 passes.

On both sides of the welding surface 11 of the tube bottom 5 are recesses or depressions 13 and 14 present, which serve to receive molten weld metal and thus as Schweißgratspeicher. To the wells 13 and 14 closes one each from the surface of the tube sheet 5 excellent jetty 15 and 16 on which the wells 13 and 14 each to the peripheral edge 5 ' of the tube bottom 5 or limit to its inside.

The water tank 6 has a widened water box foot 6 ' on, whose width is set so that it the webs 15 and 16 as well as the between the webs 15 and 16 of the tube bottom 5 covered space covers. At the tube bottom 5 facing bottom of the water box foot 6 ' is one with the welding surface 11 of the tube bottom 5 cooperating and complementary to this shaped welding surface 21 arranged. This circumferential welding surface 21 the water box 6 consists of one with the base 11 ' the welding surface 11 of the tube bottom 5 cooperating base 21 ' and one with the centering surface 12 the welding surface 11 cooperating guide surface 22 , The base area 21 ' and the guide surface 22 are in turn as integral parts of the welding surface 21 the water box foot 6 ' educated. It should be noted that the guide surface 22 the welding surface 21 the water box foot 6 also inclined by the angle α to the direction of the pressure P. But it falls - in contrast to the centering surface 12 the welding surface 11 of the tube bottom 5 - from the water box inside to the edge of the water tank 6 down. The guide surface 22 the welding surface 21 the water box foot 6 ' in this case preferably extends over the entire length of the two longitudinal sides 6a and 6b the water box 6 , It is also possible, the guide surface 22 only over certain sections of the long sides 6a and 6b train.

By the measures described is now in an advantageous manner a perfect leadership of the water box 6 on the tubesheet 5 achieved during vibration welding. The inclination of the centering surface 12 the welding surface 11 of the tube bottom 5 by the angle α causes on the guide surface 22 the welding surface 21 the water box 6 an outwardly directed force is exerted, so that an inwardly sunken wall of the channel box 6 when placing the water box 6 on the tubesheet 5 is pressed by the taking place during vibration welding pressurization thereof to the outside. By this centering then a congruent coverage of the two welding surfaces 11 and 21 reached. In an advantageous manner allows the oblique arrangement of the centering 12 the welding surface 11 and the guide surface 22 the welding surface 21 So both a positionally accurate alignment of the channel box 6 on the tubesheet 5 as well as its reliable leadership in the vibration welding process. The angle α is in this case to be chosen such that both the centering 12 a sufficiently large spreading force on the water box foot 6 ' exercises as well as a sufficiently high welding pressure is guaranteed. Due to the positional alignment of the associated welding surfaces 11 and 21 becomes a leading to only partial overlap emigration of one of the two welding surfaces 11 . 21 prevents, so that advantageously the geometric surface of the welding surfaces 11 . 21 is equal to the effectively available for vibration welding effective area. In addition, the oblique arrangement causes the integral components of the welding surfaces 11 and 21 forming centering and guiding surface 12 and 22 in that, for the same horizontal extent, this effective welding surface is greater than that in the case of an only plane execution of the welding surfaces 11 . 21 , The course of the centering surface sloping from inside to outside 12 the welding surface 11 of the tube bottom 5 also brings with it the advantage that the weld metal occurring during vibration welding is preferably discharged to the outside, so that it is possible through the recess 14 to form smaller formed inner Schweißgratspeicher. The the wells 13 and 14 limiting ridges 15 and 16 also ensure that the weld burr stores are hermetically connected, so that the weld metal does not escape from the weld burr stores and in the flowed through by the coolant inside the water box 6 or to the outside of the water box 6 can escape. The covering of the bars 15 and 16 through the broadened water box foot 6 ' also has the advantage that the water box foot 6 ' adjacent tops 15 ' and 16 ' of the bridges 15 and 16 form further welding surfaces, so that the liquid-tightness of the water box tube-bottom connection is further increased.

In 3 is a second embodiment of the in 2 illustrated connection arrangement of tube sheet 5 and water tank 6 shown. This corresponds essentially to the in 2 illustrated connection arrangement, so that the same parts can be identified by the same reference numerals. The essential difference between the first and second connection arrangement is that one of the welding surface 11 of the 2 corresponding welding surface 31 of the tube bottom 5 V-shaped and thus two centering surfaces 32a and 32b having. According to the V-shaped design of the welding surface 31 is one of the welding area 21 of the 2 corresponding welding surface 33 the water box 6 wedge-shaped and has two guide surfaces 34a and 34b on. By such, substantially V-shaped design of the welding surface 31 of the tube bottom 5 and the complementarily shaped, substantially wedge-shaped welding surface 33 the water box 6 is in an advantageous manner an exact positioning and thus a congruent overlap of the associated welding surfaces 31 and 33 even with a water tank 6 reached, whose Wasserkastenfuß 6 ' over the course of the long sides 6a and 6b the water box has a curved both inwardly and outwardly, so wavy course.

In 4 a third embodiment of a connection arrangement is shown. A welding surface 41 of the tube bottom 5 has a substantially orthogonal to the direction of action of the pressure P extending base 41 ' on, the function of their base area 11 ' of the 2 equivalent. With the base area 41 ' the welding surface 41 of the tube bottom 5 also acts essentially to this parallel base 43 ' a welding surface 43 the water box foot 6 together. These two bases 41 ' and 43 ' the peripheral welding surfaces 41 and 43 extend over the entire length of the peripheral edge 5 ' (please refer 1 ) and 6 '' of the tube bottom 5 and the water box 6 , The main difference between the in 4 illustrated connection arrangement with respect to the connection arrangements described above is now that the welding surfaces 41 and 43 of the 4 inclined centering surfaces 42a . 42b or guide surfaces 44a . 44b which are different from the bases 41 ' respectively. 43 ' starting in sections in the recesses or depressions serving as Schweißgratspeicher 13 . 14 or in the left and right of the base 43 ' located area of the water box foot 6 ' extend. Along each longitudinal side 6a . 6b the water box 6 So occurs in the field of Schweißgratspeicher an alternating sequence of sections of the centering 42a . 42b or the guide surfaces 44a . 44b on, wherein in each case a partial section of the centering surface 42a . 42b a Schweißgratspeicher follows. To catch the individual sections of the centering 42a . 42b the welding surface 41 of the tube bottom 5 with the respective cooperating subsections of the centering surface 44a . 44b the welding surface 43 the water box 6 to prevent, is advantageously provided that in each case one of two cooperating sections of the centering and the guide surfaces 42a . 42b and 44a . 44b at least the amplitude of the vibration movement of the vibration welding is longer than the other of these two sections. But it is also possible, the guide surfaces 44a . 44b over the long sides 6a . 6b the water box 6 to train continuously.

The principles described above for the design of a connection assembly for vibration welding of water tank 6 and tube sheet 5 are also in a vibration welding of the partition 9 the water box 6 with the tubesheet 5 applicable. This is on 5 referenced, in which one the connection of partition 9 and tube sheet 5 detailed detail X of the 1 is shown in enlarged scale. The tube sheet 5 has a V-shaped welding surface 51 with two centering surfaces 52a . 52b on, with a complementary thereto executed welding surface 53 the partition 9 interacts. This is designed essentially wedge-shaped and has two guide surfaces 54a . 54b on. The in the Aufsetzbereich the partition 9 on the tubesheet 5 arranged welding surface 51 extends in a longitudinal dividing or at a transverse dividing wall 9 over the entire length or width of the water box 6 and is formed by two each a Schweißgratspeicher forming depressions 55a and 55b limited. To these depressions 55a . 55b close off the top of the tubesheet 5 excellent bars 56a . 56b on which of a base 9 ' the U-shaped partition designed 9 be covered.

By the measures described is achieved in an advantageous manner that now in the field of partition 9 a comparison with the known heat exchangers significantly improved welding of partition 9 and tube sheet 5 is guaranteed. By the opposite the chambers 9a . 9b the water box 6 by means of the webs 56a . 56b hermetically sealed weld burr store 55a . 55b is achieved in an advantageous manner, that even in the welding of the partition 9 no weld metal in the coolant from the heat exchanger 1 flowed through area and thus can enter the coolant circuit. The U-shaped design of the partition 9 guarantees a well-defined pressure application point during vibration welding of the partition 9 , Due to the U-shape of the partition 9 is a close to the welding surfaces 51 . 53 ensuring a pressure application point, so that buckling of the partition 9 is prevented by the pressurization of the vibration welding process.

An alternative option for welding optimization of the described heat exchanger 1 is determined by the 6 explained. This shows a section of a plan view of a tube sheet 5 , the multi-row openings 7 for receiving the ends 8th the pipe forks 2 having. This multi-row arrangement of the openings 7 in the tubesheet 5 conditionally that the the interior of the water box 6 dividing partition 9 has a wave-shaped course (see 7 ). Accordingly, the welding surface 61 of the tube bottom 5 also wavy. With such a shaped welding surface 61 and a partition 9 is the centering of the partition described above, serving to achieve a congruent coverage associated welding surfaces 9 by means of inclined and cooperating Zentrierund guide surfaces not possible.

In order to still have a sufficiently large coverage of partition 9 and the welding surface 61 of the tube bottom 5 even with a partition 9 to reach, which due to manufacturing tolerances or the like does not have exactly the ideal shape corresponding training, it is provided that the welding surface 61 next to a wave-shaped base 62 in the area of each turn several in the transverse direction of the water box 6 running bridges 65a - 65c having. This achieves in an advantageous manner, that even with a laterally offset partition 9 a sufficiently large overlap between this partition 9 and the base area 62 and the jetties 65a - 65c existing welding surface 61 of the tube bottom 5 given is. The attachment of transverse webs 65a - 65c It also has the advantage of giving a stiffer bottom geometry of the tubesheet 5 is achieved, so that when the pressurization of the tube plate 5 in the area of the partition 9 during vibration welding no distortion of the same occurs.

A further improvement of the welding quality in the described heat exchanger 1 by the attachment of longitudinal ribs or transverse ribs in the range of

Outlet of the water tank 6 achieved in an improved support of the water box foot 6 ' result.

This is on the 7 and 8th respectively. 9 and 10 directed.

In 7 is a section through the water box 6 represented, which - as out 7 it can be seen - three nozzles 61 to 63 having. In the area of this neck 61 - 63 are transverse ribs 64a - 64p arranged. By this measure, it is achieved that a better transfer of the pressure applied to the water tank during vibration welding pressure P from the water tank top 65 in the area of the water box foot 6 ' is reached. In addition, by the transverse ribs 64a - 64p a bending of the water box foot 6 ' prevented during vibration welding: The transverse ribs 64a - 64p cause this under pressure can no longer move laterally. Another advantage of these transverse ribs 64a - 64p is that thereby a collapse of the Wasserkastenfußes 6 ' counteracted during its production by injection molding.

In 9 is another cut through the water box 6 shown. This is in particular on the longitudinal ribs 66a and 66b referenced (see also 10 ) located in the area of the nozzle 61 and 63 in the longitudinal direction X of the water box 6 extend. The longitudinal ribs 66a . 66b serve - according to the transverse ribs described above 65a - 65p - to a better transfer of the water tank 6 acting pressure P from the water box top into the area of the water box foot 6 ' , In addition, through these longitudinal ribs 65a . 65b the mechanical stability in the area of the water box foot 6 ' increased, so that in turn a bending of the water box foot 6 ' prevented during vibration welding.

A further improvement of the weld quality is achieved by stiffening the bottom geometry of the tube bottom 5 reached.

This is on 11 referenced, in which a bottom view of a tube sheet 5 is shown. It is essential that the tubesheet 5 Cross struts on its underside 71a - 71d having, what the just mentioned stiffening of the bottom geometry of the tube sheet 5 cause. In addition, these cross struts have 71a - 71d the advantage that thereby a cheaper injection molding production of the tube sheet 5 is achieved because these cross struts 71a - 71d favorably influence the flow of the plastic material during injection molding and thus an op allow full filling of the injection mold.

In addition, in 1 on the at the bottom of the tubesheet 5 attached bags 72 referenced, which in a known manner, the fixing the position of the tube sheet 5 pick up the welding tool during vibration welding. In an advantageous manner, it is now provided that two defined pockets 72a and 72b are manufactured with an extremely tight tolerance, so that the tube sheet 5 during vibration welding is no longer moved from its fixed position. As a result of this rigidly fixed position of the tubesheet 5 is achieved in an advantageous manner that now the entire amplitude of the vibration movements can be exploited for vibration welding: Through the said shape of the pockets 72a . 72b of the tube bottom 5 There are no undesirable fluctuations of the tubesheet 5 around his predetermined rest position more.

Claims (19)

Heat exchanger, in particular for motor vehicles, comprising a tube plate ( 5 ) and a water tank ( 6 ) made of plastic with a partition ( 9 ), wherein the tubesheet ( 5 ) liquid-tight at the water box ( 6 ) is fixed by one in the edge area ( 5 ' ) of the tube bottom ( 5 ) circumferential welding surface ( 11 . 31 . 41 ) with a complementary welding surface ( 21 . 33 . 43 ) of the water box ( 6 ) and another welding surface ( 51 ) of the tube bottom ( 5 ) with a complementary welding surface ( 53 ) of the partition ( 9 ) are vibration-welded, the welding surfaces ( 21 . 33 . 43 . 53 ) at the water box ( 6 ) and / or on the partition ( 9 ) obliquely to the pressure direction (P) extending guide surfaces ( 22 . 34a . 34b . 44a . 44b . 54a . 54b ) and the corresponding welding surfaces ( 11 . 31 . 41 . 51 ) at the tube bottom obliquely to the pressure direction (P) extending centering surfaces ( 12 . 32a . 32b . 42a . 42b . 52a . 52b ) exhibit. Heat exchanger according to claim 1, characterized in that the centering surface ( 12 ) in the water box inside area of the welding surface ( 11 ) of the tube bottom ( 5 ) is arranged. Heat exchanger according to claim 2, characterized in that the centering surface ( 12 ) of the welding surface ( 11 ) to the peripheral edge ( 5 ' ) of the tube bottom ( 5 ) decreases. Heat exchanger according to claim 1, characterized in that the welding surface ( 31 ; 41 ) of the tube bottom ( 5 ) Is V-shaped and two mutually inclined centering surfaces ( 32a . 32b ; 42a . 42b ) having. Heat exchanger according to one of claims 1 to 4, characterized in that the welding surface ( 31 ; 41 ; 33 ; 43 ) of the tube bottom ( 5 ) and / or the water box ( 6 ) a substantially orthogonal to the pressing direction (P) of the water box ( 6 ) on the tubesheet ( 5 ) running surface ( 31 '; 41 '; 33 '; 42 ' ) having. Heat exchanger according to claim 1, characterized in that the welding surface ( 41 ) of the tube bottom ( 5 ) from its base ( 41 ' ) outgoing, in sections serving as Schweißgratspeicher recesses ( 13 . 14 ) extending centering surfaces ( 42a . 42b ), and that the welding surface ( 43 ) of the water box ( 6 ) from their base ( 43 ' ) outgoing guide surfaces ( 44a . 44b ), each extending to the peripheral edge ( 6 '' ) and to the inside of the water box ( 6 ). Heat exchanger according to claim 6, characterized in that in each case a guide surface ( 44a . 44b ) or a centering surface ( 42a . 42b ) is formed longer by at least the amplitude of the vibration welding movement than the cooperating with it centering surface ( 42a . 42b ) or guide surface ( 44a . 44b ). Heat exchanger according to claim 1, characterized in that the welding surface ( 11 ; 31 ; 41 ) of the tube bottom ( 5 ) and / or the welding surface ( 21 ; 33 ; 43 ) of the water box ( 6 ) by at least one substantially parallel to this welding surface extending recess ( 13 . 14 ) is limited. Heat exchanger according to claim 8, characterized in that the welding surface ( 11 ; 31 ; 41 ) on both sides of each depression ( 13 . 14 ) and that the water box inside recess ( 14 ) smaller than the edge arranged recess ( 13 ) is executed. Heat exchanger according to one of the preceding claims, characterized in that the water tank ( 6 ) of the heat exchanger ( 1 ) this into two chambers ( 9a . 9b ) dividing partition ( 9 ) and the tubesheet one in the region of the partition ( 9 ) of the water box ( 6 ) arranged welding surface ( 51 ), and that the welding surface ( 51 ) of the tube bottom ( 5 ) of two recesses serving as weld grate storage ( 55a . 55b ) is limited. Heat exchanger according to claim 10, characterized in that the welding surface ( 51 ) of the tube bottom ( 5 ) Is V-shaped and has two centering surfaces ( 52a . 52b ), and that the partition ( 9 ) a complementary to the welding surface ( 51 ) of the tube bottom ( 5 ) executed welding surface ( 53 ) with two guide surfaces ( 54a . 54b ) on has. Heat exchanger according to one of the preceding claims, characterized in that the recesses serving as weld burr storage ( 13 . 14 ; 55a . 55b ) through from the top of the tube sheet ( 5 ) excellent bridges ( 15 . 161 56a . 56b ) are limited. Heat exchanger according to claim 12, characterized in that the water tank ( 6 ) one the webs ( 15 . 16 ) covering, widened water box foot ( 6 ' ) having. Heat exchanger according to claim 11, characterized in that the partition wall ( 9 ) Is U-shaped. Heat exchanger according to one of the preceding claims, characterized in that the welding surface ( 61 ) of the tube bottom ( 5 ) in the transverse direction to the partition wall ( 9 ) of the water box ( 6 ) running webs ( 65a - 65c ) having. Heat exchanger according to claim 15, characterized in that the partition wall ( 9 ) has a wave-shaped course. Heat exchanger according to one of the preceding claims, characterized in that the water tank ( 6 ) in the region of its inlet or outlet nozzles ( 61 - 63 ) Longitudinal ribs ( 66a . 66b ) or transverse ribs ( 65a - 65p ) having. Heat exchanger according to one of the preceding claims, characterized in that the tubesheet ( 5 ) on its underside pockets ( 72 . 72a . 72b ) for receiving a position fixing the tube sheet ( 5 ) has at least two of these pockets (Vibration welding) causing welding tool 72a . 72b ) are manufactured with a very tight tolerance. Heat exchanger according to one of the preceding claims, characterized in that the tubesheet ( 5 ) Cross struts ( 71a - 71d ) for stiffening the bottom geometry.