EP1213556A1 - Flat tube heat exchanger with deformed tube ends - Google Patents

Abstract

The heat exchanger includes flat tubes (1) which have one end sector (1a) deformed to fit in a component (3) forming a connection cavity. This end sector is twisted and/or bent to form an adjacent section (1b) of smaller measurement across the cross section. The flat tubes may be twisted about an angle ( alpha , beta ) between about 10 and 20 degrees at the end fitting in the connection component. This end may be bent in a V shape or a U shape so that the flanks of the bent end sectors are in contact with each other.

Description

The invention relates to a heat exchanger constructed from flat tubes, in which the flat tubes on at least one, in a connection space forming Component, e.g. a distributor and / or a collecting tube, opening end section are reshaped.

Heat exchangers constructed from flat tubes, in which the flat tubes with unformed end section parallel in a connection space-forming component, such as a header and / or a distributor pipe, for example used as condensers and evaporators in vehicle air conditioning systems. Under the designation flat tube heat exchangers are also intended in the present case Disc heat exchangers are to be understood in which rectangular, elongated, hollow discs are used as "flat tubes", the inside of which the refrigerant of the air conditioning system is led. With these conventional heat exchangers along their entire length straight flat tubes is the inside diameter of the connection space forming component determined by the width of the flat tubes. With Larger flat tube width is therefore a larger inner diameter for this Component required, so that its realization requires a larger wall thickness is required if the burst pressure strength should remain the same. Using of pipes as connection space-forming components also occurs Difficulty on that with increasing flat tube width and thus growing Diameter of the connection space-forming pipes whose dead volume increases. In any case, the width of the connection space-forming component is the same conventional heat exchangers larger than that of flat tubes.

A heat exchanger is described in the patent EP 0 565 813 B1 constructed from a plurality of tubes, preferably with an oval cross section is the end in triangular openings of a bottom plate of a Collection box used and for this purpose at their pipe end section in are formed into a triangular shape. After inserting the triangular pipe end sections in the triangular openings of the base plate Tube ends widened to fit the tubes to the respective base plate to collect boxes arranged on both sides.

A heat exchanger is disclosed in published patent application EP 0 659 500 A1, that of several, spaced one above the other, bent in a U-shape Flat tubes is built. The two legs are U-shaped Flat tubes twisted by 90 ° in relation to their connection area, so that they both lie in a common transverse plane. One free end each of the flat tubes is to a distribution channel and the other free end to one Collection channel connected, with distribution and collection channel on the same Heat exchanger side are arranged and that introduced via the distribution channel Heat transfer medium in a U-shape parallel through the individual flat tubes flows to the collecting channel.

US 3,416,600 is a serpentine type heat exchanger discloses, in which a stack of serpentine curved flat tubes is provided which are twisted by 90 ° in their end sections. With these twisted The end sections of the flat tubes are inserted into associated manifolds, which for this purpose with the circumferentially inserted, running in the longitudinal direction of the pipe and spaced longitudinal slots are provided. In addition, you can the flat tubes must be twisted by 180 ° in a central area.

The invention has the technical problem of providing a flat tube heat exchanger of the type mentioned at the beginning, which is a comparative has a small dead volume in the connection space for a given wall thickness of the connection space-forming component a high burst pressure security has, with a given flat tube width with a comparatively small overall depth can be manufactured and, if necessary, in particular as a condenser for air conditioning is usable.

The invention solves this problem by providing a flat tube heat exchanger with the features of claim 1 or 2. In this The heat exchangers are the flat tubes in their in the connection space forming Component opening end section on an opposite to its subsequent Section less transverse extension twisted and / or bent. It leaves their passage cross-section essentially also in the formed end section keep constant. The lower transverse extent of the twisted or bent Flat tube end section opposite the subsequent flat tube section makes it possible to construct the connection space-forming component, e.g. a collective or manifold, with a depth that is only slightly larger than the reduced transverse extent of the flat tube end portion needs and can therefore be smaller than the depth of the flat tubes or at least need not be larger than the same. Both end sections can each flat tube be shaped in the manner according to the invention, while the flat tubes in the intermediate section e.g. straight with her can have a larger transverse extension with respect to the end sections, which then the depth of the flat tubes and thus possibly the entire Heat exchanger determined. The low overall depth achievable according to the invention of the connection space-forming components for a given flat tube width the further advantage that the same to achieve a predetermined burst pressure security can be made with a relatively small wall thickness and only one have relatively low dead volume. You can also do that Flow through heat exchanger volume for a given heat transfer capacity keep comparatively low, which can reduce the amount if necessary of the heat transfer fluid flowing through compared to conventional Flat tube heat exchangers allowed.

To achieve a compact design in the direction in which the Flat tubes are arranged side by side, the twisting takes place at Heat exchanger according to claim 1 specifically by an angle unequal 90 °, so that the flat tube mouths run obliquely to this direction and therefore require less installation length in this direction. The Torsion angle can be tailored to the respective application. As the torsion angle increases, the depth decreases, i.e. Width of the Insert the flat tube ends required area of the connection space forming Component, while each flat tube end section with a major axial extent opens into the component.

In the flat tube heat exchanger according to claim 1 or 2 are specifically one or several partition walls are provided in the connection space-forming component divide the connection compartment into several sub-compartments. This measure can be used to deflect the refrigerant through the flat tubes sequentially in a respective lateral connection space-forming component through successive sections of the flat tube stack. suitable for the oblique twisting of the flat tube end sections is also the respective one Partition with the corresponding inclined angle in the connection space forming Component arranged.

In a heat exchanger developed according to claim 3, the flat tubes are about its longitudinal central axis or about a longitudinal axis parallel to this twisted. In the latter case of eccentric twisting, the twisted can Flat tube end sections with alternating lateral displacement in the connection space forming Open the component so that the distance between the flat tubes lower in the non-twisted center area even with a torsion angle of 90 ° can be selected as the flat tube width without the flat tubes must be arranged laterally offset in their central areas, what would counteract a shallow depth.

In a development of the invention according to claim 4 it is provided that To shape flat tube end sections U-shaped or V-shaped and on them Assign their transverse extension to the undeformed state reduce.

In an embodiment of this measure, the U-shaped or V-shaped according to claim 5 bent flat tube end sections bent so far that the the two bent flanks of each tube touch each other, so that there is only a minimal installation depth for the connection space-forming component is required.

In a further developed according to claim 6 heat exchanger with between The corrugated fins introduced into the flat tubes are provided, the width of the corrugated fins choose larger than that of the flat tubes. The resulting Rib protrusion increases the efficiency of the heat-transmitting corrugated fins and protects the flat tubes against external damage.

In a heat exchanger developed according to claim 7, the flat tubes are manufactured in an advantageous manner in terms of production technology as extruded tubes.

In the case of a heat exchanger developed according to claim 8, the respective Partition axially into the connection space-forming component from an end face inserted and has a suitable, with in the connection space-forming component protruding flat tube ends in engagement recess.

The present invention further comprises the following advantageous heat exchangers. First, a flat tube heat exchanger with flat tubes, at least at an end section opening into a connection space-forming component are reshaped, the flat tubes in their in the connection space forming Component opening end section on an opposite to its subsequent Section less transverse extension bent or at an angle α are twisted not equal to 90 ° or twisted by an angle of 90 ° and with these end sections twisted by 90 ° in a line close together inserted into a common longitudinal slot of the connection space-forming component are. This also includes heat exchangers without partitions. Secondly a flat tube heat exchanger with flat tubes that at least one, in a connection space-forming component opening end section on an opposite its subsequent section bent less transverse extent or twisted, one or more partitions in the connection space forming Component arranged at an angle of 90 ° to its longitudinal axis are that divide the connection room into several sub-rooms, one in each associated group of successive flat tubes opens.

For these two further realizations of the invention above are in particular the following further configurations are possible individually or in combination. The flat tubes can open into the component that forms the connection space End section centered around its longitudinal central axis or around one to this parallel longitudinal axis must be twisted off-center. The flat tubes can in its end section U-or opening into the connection space-forming component Be bent in a V-shape. The flat tubes can be inserted into the connection space Component opening end section in such a U or V shape be bent so that the bent end section flanks touching lie together.

Corrugated fins can be introduced between adjacent flat tubes Width is larger than the flat tube width. The flat tubes can be made of extruded, Before bending or twisting, preferably solder and flux clad Tubes are formed. The respective partition can have a recess have and axially from a front end into the connection space forming Be used component, which in the connection space-forming component engage protruding flat tube ends in the partition recess.

Fig. 1

eine schematische Seitenansicht eines Teils eines Flachrohr-Wärmeübertragers mit schrägwinklig tordierten Flachrohrendabschnitten,

Fig. 2

eine schematische Schnittansicht längs der Linie II-II von Fig. 1,

Fig. 3

eine schematische Seitenansicht eines Teils eines Flachrohr-Wärmeübertragers mit rechtwinklig tordierten Flachrohrendabschnitten,

Fig. 4

eine schematische Schnittansicht längs der Linie IV-IV von Fig. 3,

Fig. 5

eine schematische Stirnansicht eines Flachrohres mit U-förmig umgebogenem Endabschnitt für einen Flachrohr-Wärmeübertrager,

Fig. 6

eine schematische Stirnansicht eines Flachrohres mit V-förmig umgebogenem Endabschnitt für einen Flachrohr-Wärmeübertrager,

Fig. 7

eine schematische Seitenansicht eines Flachrohr-Wärmeübertragers mit rechtwinklig tordierten Flachrohrendabschnitten und einem mit einer Trennwand versehenen, geschnitten gezeigten Sammel- bzw. Verteilerrohr,

Fig. 8

eine schematische Schnittansicht längs der Linie VIII-VIII von Fig. 7 und

Fig. 9

eine ausschnittweise Schnittansicht eines für einen der gezeigten Flachrohr-Wärmeübertrager verwendbaren Rohr/Rippenblocks.

Preferred embodiments of the invention are shown in the drawings and are described below. Here show:

Fig. 1

2 shows a schematic side view of part of a flat tube heat exchanger with flat tube end sections twisted at an angle,

Fig. 2

2 shows a schematic sectional view along the line II-II of FIG. 1,

Fig. 3

1 shows a schematic side view of part of a flat tube heat exchanger with flat tube end sections twisted at right angles,

Fig. 4

2 shows a schematic sectional view along the line IV-IV of FIG. 3,

Fig. 5

1 shows a schematic end view of a flat tube with a U-shaped bent end section for a flat tube heat exchanger,

Fig. 6

1 shows a schematic end view of a flat tube with a V-shaped bent end section for a flat tube heat exchanger,

Fig. 7

2 shows a schematic side view of a flat tube heat exchanger with flat tube end sections twisted at right angles and a header or distributor tube shown with a partition and shown in section,

Fig. 8

is a schematic sectional view taken along the line VIII-VIII of Fig. 7 and

Fig. 9

a partial sectional view of a usable for one of the flat tube heat exchanger shown tube / fin block.

The one shown in Fig. 1 in a partial, schematic side view Heat exchanger is, for example, as a condenser in a vehicle air conditioning system usable. It conventionally includes a tube / fin block, which is spaced apart from one another in the usual manner from a stack Flat tubes 1 and one in the spaces between the flat tubes 1 introduced corrugated fin structure 2. The tube / fin block is located thereby between two laterally closing side plates 6, of which in the Detail view of Fig. 1 is shown. The flat tubes 1 are also in conventionally inside with one or more flow channels provided, through which the refrigerant of an air conditioner passes can be. At the end, the flat tubes 1 open into one of each lateral distributor or manifold 3 formed connection space, of which one acts as a distribution channel and the other as a collecting channel. The above an inlet into the manifold is from there fed in parallel into the flat tubes 1 and crosses them to the opposite one Collecting tube 3, which can be seen, for example, in FIG. 1 Round tube can be. By means of the heat exchanger, another through which with the corrugated fin structure 2 spaces between the flat tubes 1 flow medium passed through in heat transfer connection with the flow medium passed through the flat tubes 1 to be brought.

It is characteristic of the heat exchanger shown that the flat tubes 1 in their two end sections 1a opposite their intermediate middle section 1b twisted by an angle α of approximately 60 ° about its longitudinal central axis are, as can be seen more clearly in FIG. As further from this sectional view can be seen, the inserted in the respective manifold or manifold 3 Pipe ends 1c thus obliquely to both the longitudinal axis 4 of the distributor or. Collecting tube 3 as well as to the flat tube transverse axis 5 Flat tube ends 1c one apart from the height, i.e. Wide, the flat tubes 1 transverse dimension less by the factor cosα than the heat transfer active, middle flat tube section 1b. This means that the flat tubes 1 too only one installation area with a correspondingly reduced transverse dimension, i.e. reduced installation depth, of the distributor or collecting pipe 3. Since that Manifold or manifold 3 only a slightly larger one The inside diameter must have the advantage that the Manifold and manifold 3 with a relatively small outer diameter R can be made, which can in particular be smaller than the transverse extent Q of the central flat tube section 1b, which as a whole The depth of the heat exchanger determines how it looks from the view of Fig. 2 results. It is understood that the manifold and header 3 with corresponding, oblique oblong holes for precise fitting and sealing soldering of the twisted pipe ends 1c are provided.

Because of the given flat tube width Q compared to conventional heat exchangers this type of smaller required inner diameter for that Distributor or manifold 3, the advantages are further achieved that the same have comparatively small dead volumes and for a given Wall thickness have a high burst pressure security, because their burst pressure resistance decreases with increasing inner diameter. Conversely, at given, required burst pressure security the wall thickness of the distributor and Collecting tubes 3 compared to conventional heat exchangers with not formed confluent flat tube ends can be reduced.

Optionally, one or more can be in one or both connection pipes 3 Partitions 16 may be provided around that formed by the entire connecting pipe 3 Connection space in several, in the direction of the pipe longitudinal axis 4 successive Subdivide subspaces 17a, 17b, as shown in FIG. 2. The partition 16 is at an angle of inclination α of the twisted flat tube ends 1c corresponding angle obliquely to the tube longitudinal axis 4 in the space arranged between two adjacent pipe ends 1c. Such Division of the respective connection space into a plurality of sub-spaces 17a, 17b is particularly favorable for condensers, to keep the refrigerant from a subspace, e.g. the subspace 17a, to feed into the flat tubes opening therein, in the opposite connection pipe in the with the other subspace 17b redirect connected flat tubes and through the latter into these others To manage room 17b. If necessary, using several Partitions this flow deflection in the connection pipes as often as desired to be repeated. In this way, the refrigerant can be meandered through the tube / fin block.

3 and 4 is a variant of the heat exchanger of FIGS. 1 and 2 shown. In this variant, there is between two side plates 11, which is shown in Fig. 3, arranged tube / fin block in turn from a stack of spaced flat tubes 10, however, in the spaces between two flat tubes 10 in this case a double corrugated fin structure 12 is introduced, each of two individual Corrugated ribs and a separating plate 13 separating them. In this way is a comparatively large distance between flat tubes without significant impairment strength properties and heat transfer properties of the tube / fin block.

A characteristic of the heat exchanger of FIGS. 3 and 4 is that the end sections 10a of its flat tubes 10 compared to the intermediate, middle Flat tube section 10b through an angle β of 90 ° around the longitudinal central axis are twisted, as can be seen in more detail in FIG. 4. To do this without the cross offset To enable individual flat tubes 10, the flat tube spacing T is more precise said the distance between adjacent middle flat tube sections 10b, slightly chosen larger than the width Q of the flat tubes 10. Through this right angle The flat tube end sections 10a are twisted in the connection space-forming sections Components, which in turn realized as a manifold 14 and manifold inserted flat tube ends 10c in a line along the distributor or Longitudinal collecting tube axis 15, for which purpose the distributor and the collecting tube 14 correspondingly introduced in succession in a line on the circumferential side Longitudinal slots are provided.

This right-angled twisting of the flat tube end sections can be seen 10a for the manifold and manifold 14 pipes with special shallow depth, i.e. use a small diameter R. Accordingly their dead volumes can be kept to a minimum, and a relatively small one is sufficient Wall thickness to achieve sufficient burst pressure security. In turn the outer diameter R of the manifold and header pipe 14 smaller than the transverse extent Q of the flat tubes 10 and thus the tube / fin block be selected, the transverse extent of which is the overall depth of the entire heat exchanger determined.

The connection pipe 14 shown and, if necessary, the opposite, not shown Connection pipes each have one or more partition walls 18, which is perpendicular to the pipe longitudinal axis 15 between two adjacent flat pipe ends 10c are arranged as illustrated in FIG. 4. By the respective Partition 18 becomes the connection space of the relevant connection pipe 14 in several, in the direction of the pipe longitudinal axis 15 successive subspaces 19a, 19b divided. As described above for FIGS. 1 and 2, this is for example useful for condensers to the refrigerant in a meandering shape Flow path with deflection in the respective connection pipe one or more times from a partial space of the one connecting pipe through one connected part of the flat tubes 10 in the other connecting tube and from there via an adjacent set of flat tubes 10 into a next subspace of the first-mentioned connecting pipe.

It goes without saying that in addition to the two examples shown with torsion angles of approx. 60 ° or approx. 90 ° alternatively every other torsion angle between 0 ° and 90 °, preferably between 10 ° and 90 °, for the rotation of the flat tube end sections compared to their subsequent flat tube section is. Furthermore, as an alternative to flat tubes with twisted end sections those with end sections bent over to a smaller transverse extent may be used, as in two examples in FIGS. 5 and 6 is shown.

The flat tube shown in FIG. 5 is of a rectilinear middle section 20 bent into a U-shaped end section 20a, so that the Flat tube ends 20b of the in this example with multiple, separate flow channels 21 manufactured flat tube have a U-shape. With so shaped Flat tubes can in turn be a heat exchanger shown in FIGS. 1 to 4 shown type are built, in which the transverse extent of the insertion of the flat tube ends in the connection space-forming components Installation area noticeably less than the transverse extension of the flat tubes or of the tube / fin block built with it.

Fig. 6 shows a flat tube extending from a straight central region 22 in its End portions 22a is bent in a V-shape, so that the flat tube ends 22b have a V-shape. As can be seen from Fig. 6, also have this Flat tube type, the bent flat tube end portions 22a an essential less transverse extension than the intermediate flat tube middle section 22. When building a tube / fin block heat exchanger with this Flat tube type thus again results in the explanations for the above examples Benefits.

It goes without saying that instead of the round pipes shown, distributor or Collection boxes with any other cross-section as connection space-forming Components can be used that are one or more pieces and with a curved or flat, the flat tube ends receiving floor can. The required pipe openings can be milled, punched, laser cut or introduced by hydroforming and with or without Pull-throughs can be realized. The flat tubes, which are specially also discs Heat exchangers can be in disk construction, for example in one piece by extrusion or by welding several pipe parts together or by forming and then welding a blank produced.

In addition to the straight line shown, the flat tubes can be used in their area between the twisted and / or bent end sections too have a curved course. The partition walls of a used double corrugated fin structure as an alternative to the course shown perpendicular also in a point to the longitudinal axis of the connection space-forming component Angle to be arranged obliquely to the same. Furthermore, it goes without saying that, depending on requirements, the flat tubes only at one of their two end sections can be twisted and / or bent and with the other End section then not converted into a smaller transverse extent in one associated connection space-forming component open. The twisting or The flat tube end sections can each be bent so that the The cross-section of the flat tubes also essentially in this area can be kept constant, which is preferred for most applications.

Instead of the longitudinal twisting shown in FIGS. 1 to 4, the Flat tube end sections also off-center, i.e. about one to its longitudinal central axis parallel offset axis, be twisted. Especially when twisted at right angles can then face the manifold and header if necessary the intermediate tube / fin block be laterally offset, if the flat tubes are arranged in such a way that their eccentrically twisted end sections all on one side of the longitudinal median plane of the tube / fin block. This can be for certain installation situations be beneficial.

In a further alternative, the flat tube ends can be arranged that their end sections alternate on one side or the other this longitudinal median plane of the tube / fin block. Suitable for that are then two parallel rows of in the manifold or manifold Introduce longitudinal slots, the longitudinal slots of a row with side Offset between the longitudinal slots of the other row. There due to the lateral offset, the longitudinal slots of one row axially extend beyond the height of adjacent longitudinal slots in the other row can, the flat tubes can even with a right-angled end Place twists close together in the tube / fin block. in the In the special case of right-angled twisting, this distance is down through limits half the width of the flat tubes, so that it is in particular smaller than the flat tube width can be. Accordingly, a low height can be choose for the corrugated fins, which improves their heat transfer efficiency. This is especially true for use cases where the width the flat tubes is less than that of the corrugated fins.

7 and 8 is a variant of the heat exchanger of FIGS. 3 and 4 in abbreviated form. As in the embodiment of FIGS. 3 and 4 here, too, a tube / fin block from a stack spaced apart from one another Flat tubes 30 are provided, the end portions 30a opposite the middle flat tube section are twisted by 90 ° around the longitudinal central axis. However, only one corrugated fin structure is simple between the flat tubes 30 Corrugated ribs 31 are provided. In this example, the distance between the flat tubes corresponds T1 in the block of flat tube width Q1. As a result, the flat tube ends 30a twisted at right angles on each of the two connection sides of the tube / fin block touching each other in a line, the runs parallel to the longitudinal axis 32 of two lateral connecting pipes 33, 34. Each of the two connecting pipes 33, 34 has a circumferential continuous longitudinal slot 35, in which the associated, in sealed a tightly adjacent twisted flat tube ends 30a are inserted.

If the flat tubes 30 e.g. in groups when used for a capacitor The refrigerant should flow through sequentially, as in the example 1 and 2 also possible in this example, one or more Partitions 36 to be provided in one or both connecting pipes 33, 34. The Partitions 36 are perpendicular to the connecting pipe longitudinal axis 32 and divide the connection space of the relevant connection pipe 33, 34 into several Sub-rooms 37a, 37b. The left connecting pipe 33 shown in section in FIG. 7 has a refrigerant inlet 38 opening into a first partial space 37a, so that the refrigerant introduced there, as indicated by the flow arrows, fed into the flat tubes opening into this sub-space 37a, from transported there into the right connecting pipe 34, there into a subsequent one Group of with a next subspace 37b of the left connection pipe 33 connected flat tubes deflected and through these in said next Subspace 37b is directed. This meandering flow is repeated as many times as necessary until the refrigerant, e.g. Likewise in the first-mentioned connection pipe 33 provided refrigerant outlet 39 becomes.

The respective partition 36 can be in the transition area between two adjoining, twisted flat tube ends 30a or, as shown in Fig. 7, be arranged within the end region of a flat tube 30b if the flat tubes 30 are designed as multi-chamber flat tubes. The partition 36 then lies between the walls of two adjacent chambers of the flat tube 30b, at least this flat tube 30b twisting at the end is that each of its chambers on both end sides in the same direction, i.e. up or down, curved, so that in a connection pipe 33 refrigerants introduced into the upper chambers on the other connection pipe 34 also emerges from the chambers above. How special 8, the partition wall 36 has a slot 36a which sealed the twisted end region 30a of the corresponding flat tube 30 receives. The partition 36 is axially from an end face of the connecting pipe 33 ago used, by engaging the flat tube ends 30a is guided in its slot 36a against rotation before it then reaches the installation position is sealed, e.g. by sealing soldering.

9 shows a detail of a longitudinal sectional view through a tube / fin block, as it can be used for the heat exchangers described above is. It is characteristic of this tube / fin block that the width W of the Corrugated fins 40 are chosen to be larger than the width Q of the multi-chamber tubes Flat tubes 41. This provides a rib projection that the efficiency of the corrugated fins 40 with regard to their heat transfer capability increased and the flat tubes 41 against damage from the outside protects. The ratio Q / W can be 2/3, for example.

In all the examples described above, the flat tubes can advantageously be manufactured as extruded tubes. It can also be an advantage be the tubes before their end twisting or bending with a solder To provide flux plating. This facilitates sealed insertion the flat tube ends into the connecting tubes using sealing soldering.

Claims (8)

Flat tube heat exchanger with Flat tubes (1) which are formed at least on an end section (1a, 30a) opening into a connection space-forming component (3, 33), characterized in that the flat tubes (1) in their end section (1a, 30a) opening into the connection space-forming component (3, 33) are bent over to a smaller transverse extent than their connecting section (1b) or are twisted by an angle α other than 90 °, one or more Partition walls are provided in the connection space-forming component, which subdivide the connection space into a plurality of subspaces, the partition walls being arranged at an angle not equal to 90 ° to the longitudinal axis of the connection space-forming component. Flat tube heat exchanger with Flat tubes (1) which are bent or twisted at least at one end section (1a) opening into a connection space-forming component (3) to a transverse extension which is smaller than that of their adjoining section (1b), characterized in that one or more partitions (18) are provided in the connection space-forming component (3), which subdivide the connection space into a plurality of subspaces (17a, 17b) into which a respective group of successive flat tubes opens, the partitions at an angle unequal to 90 ° to the longitudinal axis of the connection space-forming component are arranged. Flat tube heat exchanger according to claim 1 or 2, further characterized in that the flat tubes in their end section opening into the connection space-forming component are twisted eccentrically about their longitudinal central axis or eccentrically about a longitudinal axis offset parallel to this. Flat tube heat exchanger according to claim 1 or 2, further characterized in that the flat tubes (20, 22) are bent into a U or V shape in their end section (20a, 22a) opening into the connection space-forming component. Flat tube heat exchanger according to claim 4, further characterized in that the flat tubes are bent into a U or V shape in the end section opening into the connection space-forming component in such a way that the bent end section flanks are in contact with one another. Flat tube heat exchanger according to one of claims 1 to 5, further characterized in that between adjacent flat tubes (41) corrugated fins (40) are introduced, the width (W) of which is greater than the flat tube width (Q). Flat tube heat exchanger according to one of claims 1 to 6, further characterized in that the flat tubes are formed from extruded tubes which are preferably solder and flux-clad before the bending or twisting. Flat tube heat exchanger according to one of claims 2 to 7, further characterized in that the respective partition wall (36) has a recess (36a) and is inserted axially from one end into the connection space-forming component (33), the component forming the connection space engage protruding flat tube ends (30a) in the partition recess (36a).

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