DE102006002789A1 - Heat exchanger tube has internal chamber extends from center of tube past location to interior surface of second narrow side - Google Patents

Abstract

A first portion of an outer wall overlaps a second portion of the outer wall at a second narrow end and defines a seam. The first portion has an end at a location along the width of the tube. The internal chamber extends from the center of the tube past the location to the interior surface of the second narrow side. The tube body partially defined by the sheet of material (12, 14) having a thickness of no greater than ca. 0.15 mm. An independent claim is also included for the production of a heat exchanger tube.

Description

TECHNICAL TERRITORY

The The invention relates to a flat tube for heat exchangers, which consists of a Part consists of or a single endless, metallic band can be produced, which has two narrow - and two broad sides, wherein a narrow side of the flat tube has multiple folds and wherein a compound of the part or the band in the flat tube is available. Furthermore relates to the invention heat exchangers, especially for Motor vehicles having flat tubes and a manufacturing method for heat exchangers.

WAS STANDING OF THE TECHNIQUE

The flat tube with the above features is from the EP 907 062 A1 known. The local flat tube is to be used with advantages in various types of heat exchangers, especially for applications in the field of motor vehicles. The flat tubes are soldered there in the course of their production of sheet metal strip. (see there the 10c )

One just such a flat tube is known from WO 00/52409.

There in this prior art, one of the narrow sides has convolutions, be careful when mounting the flat tubes to the heat exchanger, that the flat tubes are oriented correctly, because the stable narrow side - in the direction of travel seen the motor vehicle - always should be in front. This can be considered a disadvantage of the state of the art Technology are considered.

It give it over beyond a barely overlooked Variety of other publications that Flat tubes for heat exchangers affect.

The currently on the market modern heat exchanger for motor vehicles For example, have flat tubes in Kühlflüssigkeitskühlern whose wall thickness is approximately in the range of 0.20 mm. The flat tubes in these known heat exchangers are made of sheet metal strip material from one part and with a longitudinal seam welded.

The Further reduction of the wall thickness encounters manufacturing technology feasible Limits. For example, it is known and was also used by the Applicant carried out Try confirming that the solder joint the flat tube ends with all the reasons of strength much thicker tubesheets all the more becomes more difficult, the smaller the wall thickness of the flat tubes. Same difficulties occur with regard to the process-reliable production of quality Longitudinal welds in the flat tubes made of sheet metal strip, when the wall thickness significantly below the specified value.

PRESENTATION THE INVENTION

The The object of the invention is to provide a suitable flat tube much thinner Wall thickness available to provide a manufacturing process and to present a heat exchanger, the despite the small wall thickness of its flat tubes particularly inexpensive to produce is, as well as a cost-effective Manufacturing process for the heat exchanger to describe.

The Flat tube according to the invention has the features of claim 1. The heat exchanger according to the invention has the features of claim 13. The manufacturing method according to the invention for heat exchangers carried out with the method steps of claim 20. The dependent claims Further education or variants.

The Inventors start from the knowledge that the well-traveled ways leave and new ones have to be taken to a clear advantage to be able to represent.

It Flat tubes are provided, which consist of a part or from a single or from an undivided, endless sheet metal strip produced are, after the forming by means of soldering or welding to the Longitudinal edges of the Sheet metal strip, preferably in one of the narrow sides is connected. The Flat tubes according to the invention are characterized by the fact that despite the extremely low sheet metal strip thickness own not only one but two very stable narrow sides and that they have good thermal properties because of the small wall thickness. The assembly of the flat tubes to the heat exchanger was therefore also simplified.

The the narrow sides forming first convolutions are approximately perpendicular or arranged approximately parallel to the broadsides. The narrow sides forming Folds are multiple folds. They can have different lengths, causing cracks caused by high thermal cycling to avoid. Since the second narrow side multiple folds it is possible, despite the small sheet thickness of 0.05-0.20 mm, the Longitudinal edges of the Sheet metal strip in this narrow side of the flat tube to connect alternatively by welding. This has u. a. the advantage that the cut to length flat tubes afterwards can not open or unlock anymore.

The Broad sides of the flat tube have further folds within the Flat tube or other deformations within the flat tube. These other deformations can inwardly directed beads or the like, but not reach to the other broadside. The further folds form Flow channels inside of the flat tube. The further folds can also be multiple folds be, with individual folds are arranged close to each other.

The distances the further convolutions can rise from the narrow sides to the middle, which also the resistance is to be improved against high thermal cycling.

The Inventors propose a heat exchanger which is intended to be used in particular as a motor vehicle radiator. The flat tubes used have a wall thickness of about 0.050 mm-0.25 mm is settled, preferably, the upper limit is about 0.15 0.20 mm mm. This significant reduction in the wall thickness of the flat tubes initially leads to a significantly improved heat transfer. Further leads This measure Of course to a significantly reduced weight of the heat exchanger.

Because the inventors of such flat tubes insufficient solder joints the flat tube ends with the tubesheets expect, they leave the well-tried and currently practiced way the production of heat exchangers and suggest the network of flat tubes and corrugated ribs in which The corrugated fins also have only wall thicknesses, which in Range of about 0.030mm-0.090mm lie, without tube bottoms or collection boxes to solder. The protruding from the network flat tube ends remain during the soldering free. Free flat-tube ends are therefore within the meaning of the present proposal such which have no ribs between the flat tube ends and also no tube bottoms, in their openings stuck in the prior art, the flat tube ends. The flat tube ends protrude from the flat tube fins block preferably a few millimeters and have therefore been described as "free".

Further the inventors propose to use collecting tanks, which have at least one row of receiving openings in which the free flat tube ends of at least one row of flat tubes of the already soldered Net can be inserted. Preferably, the headers are made of plastic. they pull considering the collection boxes as one piece Manufacture injection molded parts, d. h., the at least one series of receiving openings is integrated in the collection boxes. Should the production of two or multi-piece collection boxes as better turn out convertible, then collecting boxes are used, the in one piece having at least one row of receiving openings, and the in at least one other piece have the remaining wall of the collecting tank. The least two pieces the collection boxes would be tight later to connect with each other. The proposed collection boxes have in the direction of the depth of the cooling network no or if, then a negligible supernatant over the Cooling network. There is thus no waste of the already tightly dimensioned installation space in the vehicle.

The Inventors may think preferred not to reshape the flat tube ends. they say but also that there are use cases exist in which formed flat tube ends may be useful, for example in view of the mentioned small supernatant the collection boxes. This transformation should then - given the exceptionally small Wall thickness of the flat tubes - without essential load of the wall are executed. In particular, remains the measure of Circumference of the non-deformed flat tube end equal to the size of the circumference the deformed flat tube end, which ensures that the wall in any case no substantial stretching is subjected. Practically sees so that in the course of forming the large diameter of the flat tube end reduced by a certain amount and the small diameter of the flat tube end around the corresponding Dimension is increased. It should be noted that the length of the free flat tube ends, if their transformation is provided, something is bigger, as in the cases without Forming.

The inventors have also dealt mainly with the CAB brazing technique with regard to the production of the aforementioned radiator network and found out the appropriate soldering parameters. The proposed grille nets are manufactured with significantly lower energy input, since the band - or the conveyor chain speed with which the grille nets are transported through the different temperature zones of the CAB brazing furnace, are significantly above the currently usual speeds. The reason for this lies in the extremely small plate thickness of the flat tubes and the corrugated ribs, whereby the brazing temperature is reached much faster than with thicker plates. The transport speeds have been optimized with the appropriate temperature settings. They have further ensured by the use of suitable suspensions or auxiliary devices that the proposed grille nets do not lose their shape after the completion of the soldering process, that is, that the heating and cooling are adjusting Ausdeh tion and contraction of the cooling networks does not lead to a delay of the same, which is outside the permissible tolerance range. The tolerance range, however, is relatively narrow.

After this the cooling networks have left this stage of production, their free Flachrohrenden in a further step in the mentioned receiving openings introduced the collection boxes. Should the above mentioned Forming the flat tube ends be provided, this would be now, so preferably before the introduction the flat tube ends in the corresponding receiving openings, perform. The receiving openings have corresponding inlet slopes on, so that the insertion of the flat tube ends is supported. Preferably, the flat tube ends should not into the interior of the collecting tank protrude, so that the inevitable pressure loss in the flowing through the flat tubes Medium on the desired low Level remains.

The Inventors have chosen for a kind of adhesive connection of the flat tube ends in the receiving openings decided. These are injection openings for the glue in the wall each receiving opening intended. With the help of these injection ports, the glue is in a gap between the individual flat tube ends and the wall of their receiving openings introduced, hardens ensures and ensures a permanent and tight connection of the flat tube ends in the receiving openings. The introduction of the adhesive can - as a possible alternative - even without injection ports be made because of the bottom access to the gap is possible.

It was found that the width of the mentioned gap in the range of 1.0 mm or less should be. However, the glue should be as possible wet the entire circumference of the flat pipe end. At the glue it is a suitable plasticized sealant.

SUMMARY THE DRAWINGS

following the invention will be described in exemplary embodiments to which reference is made to the accompanying drawings becomes. From this description, other possibly significant Features and effects.

The Figures show the following:

The 1 shows production stages and a narrow side of a flat tube.

2 shows a section of another flat tube.

three shows a section of another flat tube.

The 4 - 9 show more flat tubes in cross section.

The 10 - 12 show a collection box of a first embodiment of a heat exchanger without inserted flat tubes.

The 13 and 14 show sections of the first embodiment with inserted flat tubes.

The 15 - 17 show a heat exchanger in different views.

The 18 and 19 show sections of another embodiment with inserted flat tubes.

The 20 - 23 show a collection box of another embodiment of a heat exchanger without inserted flat tubes.

The 24 and 25 show sections of yet another embodiment with inserted flat tubes.

The 26 - 28 show a collection box of yet another embodiment of a heat exchanger without inserted flat tubes.

The 29 shows schematically the production process of a heat exchanger.

DESCRIPTION OF EMBODIMENTS

The the following description is mainly directed to a new coolant radiator for motor vehicles, without, however, other uses, especially for use in motor vehicles excluded. For example, the flat tubes and heat exchangers according to the invention should also used for intercooler and oil cooler They are essentially only differences in terms of Have sizing. A difference to be mentioned between Coolant cooler and Intercooler is that the flat tubes of the invention in use as intercooler larger cross sections and mostly have separate inner inserts. The in the embodiments show flat tubes for coolant radiator point no separate interior inserts on.

The strip thickness or the subsequent wall thickness of the flat tubes in this case is 0.10 mm. The aluminum alloy strip material has a solder coating on both sides on. The thickness of the solder coating is about 10-20% of the thickness of the sheet metal strip. The small diameter d of these flat tubes should be in the range of 0.8-1.5 or 2.0 mm. The large diameter D is (likewise) freely selectable within certain limits. He is in the case shown at about 50 mm. However, according to the proposed method, flat tubes with almost arbitrary dimensions can be produced, including, of course, a strip material of certain width Bb must be made available, and the facilities of the production line must be adjusted accordingly.

In the area of the narrow sides 1 the flat tubes is a multiple folding three before, which despite the extremely small wall thickness of the flat tubes relatively stable narrow sides 1 results in sufficient protection of the flat tubes from damage. This is of great importance when using the heat exchangers in motor vehicles.

According to the 1 be easy at first 30 - or multiple folds 31 formed in the endless, one-piece, metallic band. This simple 30 - or multiple folds 31 later lead to flow channels SK, which are formed in the flat tube. Then another multiple fold three made, which is one of the narrow sides 1.1 forms, in which immediately at the multiple folding three according to the indicated arrow the band is turned over to the first and the second broadside 2.1 and 2.2 to get the flat tube. The second narrow side 1.2 and the multiple fold existing there as well three were in the 1 Not shown.

The 2 and three show different formations of simple 30 And multiple folds 31 forming flow channels SK.

The 4 - 7 show, unlike 1 , the entire flat tube in cross-section and in three different versions. In the 6 and 7 the possibility was shown that the convolutions forming the flow channels SK 30 . 31 , starting from the narrow sides 1.1 and 1.2 in the direction of the center of the flat tube becoming larger distances a or larger flow channels SK can have. The number of individual folds, the multiple fold 31 form is determined appropriately. In the 4 own the multiple folds 31 for example, a fourfold wall thickness, or two individual, tightly arranged folds 30 , and in the 5 is a sixfold wall thickness (three single folds) of the multiple folds 31 intended. In the 6 were only single folds 30 used to form the flow channels SK.

Furthermore, the shows 4 a flat tube, in which the two narrow sides 1.1 and 1.2 forming multiple folds three approximately perpendicular to the broadsides 2.1 and 2.2 are arranged. The multiple folds three themselves are also formed differently. While the right narrow side 1.1 a multiple fold formed from the tape three is, is the left narrow side 1.2 with a multiple fold three provided, which was formed from the two longitudinal edges of the one-piece band. Finally, it is also possible, the multiple folding three to produce from a single longitudinal edge and the other longitudinal edge simply to the multiple folding thus produced three to apply. (Not shown)

In contrast, the shows 5 in that it is also possible to use the one narrow side 1.1 with about vertical to the broadsides 2.1 . 2.2 arranged multiple folds three to design and the other narrow side 1.2 with an approximately horizontal to the broadsides 2.1 and 2.2 arranged multiple folding three to build.

The 6 . 7 and 8th finally show flat tubes with on both narrow sides 1.1 and 1.2 horizontally arranged multiple folds three , Such multiple folds three can also have a different length L, as in the 7 is shown. This measure is particularly effective with respect to thermal cycling. It will be rugged transitions from the narrow sides 1.1 . 1.2 to the broadsides 2.1 . 2.2 avoided. In the 7 the central fold became multiple fold 30 while all other convolutions are simple convolutions 30 are. Another measure aimed at improving the thermal cycling capability is the measure already described above, according to which the distances a of the convolutions 30 or the flow channels SK from the narrow sides 1.1 . 1.2 getting bigger, see 2 . 6 and 7 ,

The 9 again shows only one of the narrow sides 1.1 the flat tube with a further embodiment of the narrow side 1.1 forming multiple folding three , The other narrow side 1.2 could, for example, like in 4 - 8th be formed shown. It should be noted at this point that the distances a are usually very small. They can start at 0.5 mm and can not be larger than a few millimeters. It should also be noted that the illustrations of the flat tubes are multiple magnifications. Thus, a flat tube with a width of about 42 mm much more numerous folds 30 . 31 or flow channels SK have as for example in the 1 will be shown. One currently regarded as rather promising flat tube is in the 8th been presented. There, only half of the flat tube has been shown. The distances a are about the same size and very small in terms of size.

By However, the above remarks are intended to distances a, in the centimeter range are not excluded.

The 10 - 14 Now show a first embodiment of a heat exchanger having flat tubes, which have been explained in a previously described embodiment. The same applies to the following embodiments of a heat exchanger - even those have such flat tubes.

For example, flat tubes, in the 8th shown embodiment are cut to the length required for the appropriate application. Subsequently, it is made of flat tubes and corrugated ribs 9 the flat tube rib block 10 by alternating stacking of flat tubes and corrugated ribs 9 formed, for example, in the 15 can be seen, showing an already mounted heat exchanger in a front view. The flat tube rib block 10 has at both ends initially free flat tube ends 11 on. In the 15 stuck the free flat tube ends 11 already in the receiving openings 12 the collection boxes 50 , The the free flat tube ends 11 owning flat tube rib block 10 is placed in a soldering oven to the flat tubes with the corrugated fins 9 metallic connect. The flat tube rib block 10 then passes through a cooling zone and stands as a united block 10 available for further assembly. On the free flat tube ends 11 then becomes a collection box 50 pushed, for example, in the 10 . 11 and 12 is shown. The collection boxes 50 are made of plastic by injection molding, as it has been successful practice for decades. The details of this embodiment, however, are from the 13 and 14 better to recognize. The flat tube ends 11 remain undeformed in this embodiment. The collection box 50 has a number of receiving openings 12 , Each receiving opening 12 is bordered by a wall and takes a flat tube end 11 on. The in the receiving openings 12 located flat tube ends 11 ends below the inner surface 51 of the collecting tank 50 to keep the pressure loss as low as possible. The last end of the intake openings 12 is so closely formed or dimensioned that the flat tube end 11 can be inserted by slight pressure. It can also be a stop for the flat tube ends 11 be present in order to limit their depth of insertion. The 29 shows purely schematically the production process of the heat exchanger described here, in four combined stations. Furthermore, there is an already soldered flat tube rib block 10 pictured on the free flat tube ends 11 the collection boxes 50 be set. The term "station" is merely a description aid, but it does not necessarily mean that there must be a local separation between the "stations". For example, where the collection boxes 50 on the free flat tube ends 11 can be pushed (station III), immediately after and at the same place the glue 20 be applied (station IV).

If possible, the liquid coolant of the motor vehicle engine should not come into contact with the adhesive used 20 come. In the 13 and 24 was at one of the flat pipe ends 11 the glue 20 indicated. This measure should help to avoid mutual interference. Therefore, it was thought, the very last end of the flat tubes not with the glue 20 to provide. This is achieved by different training. In the case mentioned sit - as mentioned - the flat tube ends 11 at the very last end in tight receiving openings 12 , Incidentally, the insertion of the flat tube ends takes place 11 of the entire block in their associated receiving openings 12 in a train. If the collection box 50 with its receiving openings 12 properly on the flat tube ends 11 sits, is - preferably also in one go - the glue 20 - A suitable plastic means with sealing properties - through the injection openings 15 through the column 13 between the flat tube ends 11 and the wall of the receiving openings 12 brought in. As the 14 best illustrated, it is an advantage - but not essential - on both sides of the collection box 50 each a number of injection ports 15 train so that the glue 20 safely wetted the entire circumference or possibly the entire gap 13 fills. The glue 20 In this case, it is also introduced from both sides at the same time. The gap width 13 must not be greater than about 1.0 mm in this embodiment. It can even be much smaller, maybe about 0.3 mm. On the injection openings 15 can also be dispensed with, if the glue 20 from the bottom 80 ( 14 ) in the column 13 is introduced.

At the collection boxes 50 are known to have connection openings 61 . 62 for the coolant to operate the heat exchanger. It is understood that one of the collection boxes 50 could also be designed as a deflection box, in which case both connection openings 61 . 62 on a single collection box 50 would be arranged. Through the ribs 9 of the flat tube rib block 10 flows cooling air. The embodiments, starting with the 18 , own flat tube ends 11 which have been reshaped, and of course the correspondingly adapted configurations of the receiving openings 12 should have. The transformation of the flat tube ends 11 (not shown) preferably takes place after completion of the soldering process, ( 29 , after station II), ie before inserting the ends 11 in the openings 12 - also in a forming technology Work step - instead. In the 18 and 19 sit the deformed very last ends of the flat tube ends 11 in closely formed ends of the receiving openings 12 , similar to the first embodiment. The above with respect to the time of performing the transformation, but does not exclude that after the insertion of the flat tube ends 11 the same by means of a tool in addition to the receiving openings 12 pressed or the like edited to improve their fit. (not shown) In the 24 and 25 In contrast, you have one in the receiving openings 12 circumferentially formed slot or a joint 55 provided, in which the very last ends of the flat tube ends 11 initially without using an adhesive 20 be inserted. These joints 55 also have a stop to limit the depth of insertion. The glue 20 is also applied here preferably after insertion. The inventors propose, mainly for the embodiments with deformed flat tube ends 11 , in front, between the flat tube ends 11 To install external patches, which are intended to help the deformation of the flat tube ends 11 under internal pressure load to avoid. In the 24 were such patches by the reference numeral 70 shown. You have a trapezoidal cross-section in the embodiment shown. This measure (supports 70 ) could be required because the forming of the flat tube ends 11 inevitably with the removal of existing in the interior of the flat tubes folds three connected in the forming area. The patches 70 can be before or after applying the glue 20 be used. ( 29 after station III or before or after station IV) They may be made of plastic or metal, and they may be integrally formed, for example comb-like, with the individual filler pieces 70 are arranged with appropriate distances on an approximately straight rail, by means of which all patches 70 can be used in one go. The rail can be removed after insertion, or at the collecting box 50 stay because it hardly takes up any space. (not shown) To the patches 70 can be mounted and fastened in the two opposite walls of the collecting tank 50 corresponding openings 72 be arranged, through which the patches 70 pushed in and finally held in their position. The row of openings 72 goes out of the 26 out. The term "filler" should not necessarily mean that its entire space must be filled in. These pieces need only be suitable as a support for the flat tube ends 11 to act. This may mean that a hardening compound (glue 20 ) also a filler 70 is. Furthermore, this may mean that a correspondingly shaped hollow body is also a filler 70 is.

In addition, stiffeners can 71 in the collection box 50 between the wall of the receiving openings 12 be formed, extending in the transverse direction of the collecting tank 50 extend, and in particular are particularly effective when the depth of the flat tube rib block 10 or the collecting box 50 Stiffening measures required. The stiffeners 71 become in the mentioned injection molding production of the collecting tank 50 with trained and are thus part of the collection box 50 or part of a collection box part. In the one cross section through the collecting box 50 displayed 25 it was hinted how it might look like if the collecting box 50 from two parts 50a and 50b consists. The parts 50a and 50b be along one in the 25 bold drawn Z-shaped line, preferably by means of welding or gluing tightly connected. Whether two parts 50a . 50b or several parts are provided or not depends on the manufacturability of the header box as an injection molded product, ie of the intended shape of the header tank 50 , The production costs are to be considered here. The mentioned stiffenings 71 are in a two-part design in the lower part 50a ,

It may also be provided that between the receiving openings 12 at least one longitudinal reinforcement 75 is arranged. The 11 shows a further cross section through the collecting box 50 in which is a piece of longitudinal stiffening on the midline 75 It can be seen that over the entire length of the collecting tank 50 enough.

Like a comparison of 14 with the 19 or the 25 shows allow deformed flat tube ends 11 a minimized or no supernatant Ü of the collecting tank 50 over the flat tube ribs block 10 provide, which meets the need for the lowest space consumption of the heat exchanger. As the 14 further shows, the supernatant Ü but also in the presence of undeformed flat tube ends 11 relatively small in comparison to the prior art, only a few millimeters.

Claims (25)

Flat tube for heat exchangers, which can be produced from one part or from a single endless metallic strip, and which has two narrow sides and two broad sides ( 1.1 . 1.2 ; 2.1 . 2.2 ), wherein the one narrow side ( 1.1 ) of the flat tube multiple folds ( three ), and wherein a compound ( 4 ) of the sheet metal strip or the part in the flat tube is present, characterized in that the second narrow side ( 1.2 ) of the flat tube multiple folds ( three ) having. Flat tube according to claim 1, characterized in that the multiple folds ( three ) in both narrow sides ( 1.1 . 1.2 ) approximately perpendicular or approximately parallel to the broad sides ( 2.1 . 2.2 ) are arranged. Flat tube according to claim 1, characterized in that the multiple folds ( three ) in the one narrow side ( 1.1 or 1.2 ) approximately vertically and in the other narrow side ( 1.1 or 1.2 ) approximately parallel to the broadsides ( 2.1 . 2.2 ) are arranged. Flat tube according to claim 2, characterized in that one or both broad sides ( 2.1 . 2.2 ) of the flat tube further folds ( 30 ) exhibit. Flat tube according to claim 1, characterized in that the further folds simple folds ( 30 ) or multiple folds ( 31 ), these multiple folds ( 31 ) have at least two densely arranged folds. Flat tube according to one of claims 1-5, characterized in that the narrow sides ( 1 . 1 . 1.2 ) forming multiple folds ( three ) parallel to the broadsides ( 2.1 . 2.2 ) are arranged may have different length (L). Flat tube according to claim 4 or 5, characterized in that the further folds ( 30 ) at intervals (a) either at a broadside ( 2 ) or alternately on both broadsides ( 2 ) are arranged or formed of the flat tube. Flat tube according to claim 4 or 5, characterized in that the further folds ( 30 ), from the narrow sides ( 1 ), increasing distances (a) from each other in the transverse direction of the flat tube. Flat tube according to claim 1, characterized in that the compound ( 4 ) in the flat tube either in the second narrow side ( 1.2 ) or in a broadside ( 2.1 or 2.2 ), but preferably near the second narrow side ( 1.2 ) is arranged. Flat tube according to one of the preceding claims, characterized in that the thickness of the sheet metal strip or the wall thickness of the flat tube is approximately between 0.050 mm and 0.25 mm, preferably between 0.05 mm and 0.15 mm. Flat tube according to one of the preceding claims, characterized in that the connection (4) has a soldering or a welded connection is. Flat tube according to claims 7 or 8, characterized that the distances (a) with a measure of begin about 0.5 mm, but up to the centimeter range can grow. Heat exchanger, in particular for motor vehicles, consisting of a brazed rib-flat tube block ( 10 ), in which the flat tubes are formed from a single metallic band, and arranged at the ends of the flat tubes collecting tanks ( 50 ), characterized in that the wall thickness of the flat tubes is about 0.050 mm-0.25 mm and the wall thickness of the ribs is about 0.030 mm-0.090 mm and that the soldered flat tube rib block ( 10 ) free flat tube ends ( 11 ), which in receiving openings ( 12 ) of the collecting tank ( 50 ) are insertable and secure. Heat exchanger according to claim 13, characterized in that the free flat tube ends ( 11 ) in the receiving openings ( 12 ) of the collecting tank ( 50 ) are preferably glued. Heat exchanger according to claims 13 and 14, characterized in that the receiving openings ( 12 ) are surrounded by a wall, and a gap ( 13 ) between the wall and the flat tube end ( 11 ) is trained. Heat exchanger according to claim 15, characterized in that in the wall either at least one injection opening ( 15 ) or that access to the gap ( 13 ) from the bottom ( 80 ) is available. Heat exchanger according to one of the preceding claims, characterized in that the receiving openings ( 12 ) are formed so that the adhesive ( 20 ) as far as possible can not get in contact with the medium flowing through the heat exchanger. Heat exchanger according to claims 13-17, characterized in that the compound ( 4 ) of each flat tube in the course of soldering the flat tube rib block ( 10 ) can be produced. heat exchangers according to any one of claims 13-17, characterized characterized in that the flat tubes are welded flat tubes. Method for producing a heat exchanger, in particular for motor vehicles, with a soldered flat tube rib block ( 10 ), whose flat tubes are produced from a single part, characterized in that the flat tube rib block ( 10 ) is formed so that initially free flat tube ends ( 11 ) are present that the free flat tube ends ( 11 ) having flat tube rib block ( 10 ) is soldered in the soldering oven that a receiving openings ( 12 ) for the flat tube ends ( 11 ) collecting box ( 50 ) or a first collection box part ( 50a ) with receiving openings ( 12 ) on the free flat tube ends ( 11 ) of the soldered flat tube rib block ( 10 ) and that an adhesive ( 20 ) into a gap ( 13 ) between the flat tube ends ( 11 ) and the wall of the receiving openings ( 12 ) is introduced. A method according to claim 20, characterized in that optionally a second collection box part ( 50b ) with the first collection box part ( 50a ), this step being performed before or after application of the adhesive ( 20 ) is performed. Process according to claims 20 or 21, characterized in that the adhesive ( 20 ) through at least one injection opening ( 15 ) or from the bottom ( 80 ) in the gap ( 13 ) is introduced. Method according to one of claims 20-22, characterized in that the flat tube ends ( 11 ) preferably before insertion into the receiving openings ( 12 ) are transformed. Method according to one of claims 20-23, characterized in that between the flat tube ends ( 11 ) Supports ( 70 ) (Filler) are introduced to support the flat tubes against internal pressure. Method according to one of claims 20-22, characterized in that the flat tube ends ( 11 ) without being deformed into the receiving openings ( 12 ) are inserted.