DE102010033309A1 - Heat exchanger fins module, heat exchanger and electric heating module - Google Patents

Abstract

A heat exchanger lamellar module (1) is proposed which consists of a metal strip (3) which is formed into heat exchanger lamellas (2) and which regularly alternates between a first level (A) and a second level (B), to form heat exchanger fins (2). It is provided that the first level (A) is completely covered with first heat transfer sections (4), but the second level (B) is only partially covered with second heat transfer sections (5) and between the second heat transfer sections ( 5) has open sections (13) not covered by second heat transfer sections (5) so that the second level (B) is designed as an alternating sequence of second heat transfer sections (5) and open sections (13).

Description

The invention relates to a heat exchanger fin module according to the preamble of claim 1 and equipped with such heat exchanger fin modules heat exchanger and electric heating modules for heating an air flow.

A heat exchanger fin module of the present type thus consists of a metal strip transformed into heat exchanger lamellae, which defines in its stretched, band-shaped, unconverted initial state with its longitudinal direction and its width direction a first plane, wherein the metal strip is reshaped in the heat exchanger lamella module in that it alternates between the first plane and a second plane, parallel to the first plane, to form a plurality of heat exchanger fins connecting the first plane and the second plane, arranged one behind the other in the longitudinal direction and through which a fluid can flow, forms in the first plane substantially planar first heat transfer sections which line up in the longitudinal direction and at least partially, preferably completely cover the first plane, in the first plane in non-overlap areas, each having at least one single-layer T. Form in the first plane in two overlapping areas, each forming at least a two-ply face of the first heat transfer sections, two layers superimposed, and in the first plane in three overlapping areas, each having at least a three-ply face the non-overlap regions, the double overlap regions and the triple overlap regions of the first heat transfer sections are each arranged one behind the other in the longitudinal direction of the metal strip and extend over the entire width of the metal strip, the front transverse edges of the two-ply partial surfaces of the first heat transfer sections Double overlapping areas are each formed in a recess formed at the rear transverse edge of the next adjacent Ni following the double overlapping area in the longitudinal direction tt overlap region are formed by a widthwise extending bevel of the metal strip so that the longitudinally front portions of the two-ply faces and the rear portions of the single-ply faces overlap in a triple overlap area, respectively, to form the three-ply faces of the first heat transfer sections; the metal strip in the second plane forms substantially planar second heat transfer sections, which are arranged one behind the other in the longitudinal direction.

Such heat exchanger fin modules are used in heat exchangers, such as motor vehicle radiators or heating modules for heating an air flow. They serve to conduct heat from the heat transfer sections into the fluid-through heat exchanger fins, of which the heat is then delivered to the fluid flowing through the heat exchanger fins, namely a liquid or a gas, usually water or air in particular, or vice versa Heat is removed from the fluid by means of the heat exchanger fins. At the heat transfer sections are heating elements (in the case of heating modules for air flow heating), optionally cooling elements (when the flowing through the heat exchanger fins fluid is to be cooled) or in turn fluid-flow channels (for example in the case of motor vehicle radiators) in heat-conducting contact with the Heat transfer sections arranged.

Known heat exchanger lamella modules of this type extend, seen in plan view on their narrow side, ie in the width direction, in rectangular meanders or sinusoidal or sinusoidal waves, or in a triangular shape, which arises because the metal strip of a heat transfer section in the Starting from the first plane, it is deflected diagonally backwards to the second plane in order to be able to connect there to the preceding heat transfer section. Examples of the described forms of known heat exchanger fin modules show the 1 to 3 ,

A preferred field of application for heat exchanger fin modules of the type mentioned is in electrical heating modules for heating an air flow, especially in vehicles, with PTC heating elements.

PTC elements are semiconductor resistors made of ceramic whose ohmic resistance is temperature-dependent. The resistance-temperature characteristic is not linear; the resistance of a PTC heating element initially decreases slightly with increasing component temperature, in order then to rise very steeply at a characteristic temperature (so-called reference temperature). This positive slope coefficient (PTC), which generally has a positive gradient, means that a PTC heating element has self-regulating properties with regard to the temperature which sets itself when the current flows through.

If the component temperature is well below the reference temperature, the PTC heating element has a low resistance, so that correspondingly high currents can be passed through. If for good heat dissipation from the Surface of the PTC heating element is taken care of, so it receives a corresponding amount of electrical power and delivered as heat. However, as the temperature of the PTC heater rises above the reference temperature, the PTC electrical resistance also increases rapidly, limiting the electrical power consumption to a very low level. The component temperature then approaches an upper limit, which depends on the heat release to the environment of the PTC heating element. Under normal environmental conditions, the component temperature of the PTC heating element can therefore not rise above a characteristic highest temperature, even if in case of failure, the desired heat dissipation from the PTC heating element to the environment is completely interrupted.

Because of this property, as well as because of the self-regulating nature of a PTC heating element, due to which the electrical power consumed by the PTC heating element corresponds exactly to the thermal power dissipated, PTC heating elements are for use in heating or air conditioning systems or other air flow heating applications predestined, especially in vehicles. For safety reasons, vehicles may not cause a flammable temperature in the heating element even in the event of a fault, although a high heat output is nevertheless required in normal operation.

The heat-conducting heat exchanger fins serve as heat-dissipating elements with which the heat generated by the at least one PTC heating element is transferred to the air flowing through the heat-dissipating area. They consist of a good heat-conducting material, preferably of metal, in particular copper, brass or preferably aluminum. They are realized in the art as reshaped, ie, for example, folded and / or bent strip band, for. B. a meandering, rectangular, Z-shaped or S-shaped folded to heat exchanger fins metal strip metal strip, which forms an elongated heat exchanger lamellar ribbon module (see, eg. EP 0 350 528 A1 and WO 2009/087106 A1 ).

Electrical heating modules with PTC heating elements and heat exchanger lamella modules of the type mentioned are usually made of several layers of surface next to each other, with its narrow side in the air flow PTC heating elements, which are electrically contacted at their flat tops and bottoms with contact surfaces. Adjacent thereto are heat exchanger lamellar modules as described above, which are also with their narrow side in the air flow and contact on their broadside the contacting surface of the PTC heating elements at regular intervals, namely with their heat transfer sections, thermally overlying. In order to achieve good heat dissipation from the PTC heating elements to the heat exchanger fin modules, adhesive bonds or other connection techniques can be used; However, it has been found to be the most efficient solution to put the PTC heating elements and the heat exchanger lamellae modules in a frame that summarizes this to a heating module and to provide within the frame at least one spring element, the alternately arranged heat exchanger fins modules and the webs with the PTC Heaters pressed together. An example of such a known electric heating module is in EP-A-0 350 528 described.

The spring-loaded pressing the heat exchanger fins modules to the PTC heating elements or at their contacting surfaces requires a high stability of the heat exchanger fins module meandering heat exchanger fins; because the heat transfer from the PTC heating element in the heat exchanger fin modules requires relatively high contact pressures in order to be efficient. But also in other applications, such as automotive radiators, high inherent stability of the heat exchanger fin modules is highly desirable.

In the WO 2009/087106 A1 Therefore, a heat exchanger fin module of the type mentioned was proposed, which is improved in terms of its stability and efficiency. In this known heat exchanger fin module, the heat transfer sections in the first and in the second plane are each identical, ie the heat transfer sections completely cover both the first plane and the second plane.

Although this known heat exchanger fin module already has an improved stability of the heat exchanger fins, it has nevertheless proved to be disadvantageous in practice in many respects. The main disadvantage is the costly production, which requires not only a lot of time because of the numerous folds of the metal strip in two completely covered levels, but in particular high tooling costs. Further, it is desirable to have further improvements in terms of higher stability, improved heat transfer, low flow resistance, d. H. achieve a lower pressure drop and the dismantling of a heat exchanger or electric heating module in its components for their separate disposal.

Based on this prior art, the present invention has the object, a heat exchanger fins module of of the type mentioned above with regard to a less expensive production, in particular with regard to lower tool costs, a higher stability, an improved heat transfer and a lower pressure loss.

This object is achieved by a heat exchanger fin module with the features of the attached claim 1. Preferred embodiments, developments and uses of the invention will become apparent from the independent and dependent claims and the following description with accompanying drawings.

A heat exchanger lamella module according to the invention thus consists of a metal strip formed into heat exchanger lamellae which defines in its stretched, band-shaped, unconverted initial state with its longitudinal direction and its width direction a first plane, wherein the metal strip is reshaped in the heat exchanger lamella module such that it regularly alternates between the first plane and a second plane, which is parallel to the first plane, to form a plurality of heat exchanger fins connecting the first plane and the second plane, which are arranged one behind the other in the longitudinal direction and with a fluid can be flowed through, forming in the first plane substantially planar first heat transfer sections which line up in the longitudinal direction and at least partially, preferably completely cover the first plane, in the first plane in non-overlap areas, each having at least one single-layer Te form the first heat transfer sections, is formed in one layer, in the first plane in two overlapping areas, each forming at least a two-ply face of the first heat transfer sections, two layers superimposed, and in the first plane in three overlapping areas, each having at least a three-ply face the non-overlap regions, the double overlap regions and the triple overlap regions of the first heat transfer sections are each arranged one behind the other in the longitudinal direction of the metal strip and extend over the entire width of the metal strip, the front transverse edges of the two-ply partial surfaces of the first heat transfer sections Double overlapping areas are each formed in a recess which is at the rear transverse edge of the next adjacent, the double overlap region in the longitudinal direction following Nic htüberlappungsbereich are formed by a widthwise extending edge of the metal strip, so that the longitudinally front portions of the two-ply faces and the rear portions of the single-ply faces overlap each in a triple overlap region to form the three-ply faces of the first heat transfer sections, and the metal strip in the second plane forms substantially planar second heat transfer sections, which are arranged one behind the other in the longitudinal direction, and has the peculiarity that the second plane is only partially covered with second heat transfer sections and not between the second heat transfer sections Having covered by second heat transfer sections covered open sections, so that the second plane is formed as an alternating sequence of second heat transfer sections and open sections.

A heat exchanger fin module according to the invention is stable because the metal strip from which the heat exchanger fin module is superposed in two layers on a partial surface of the first heat transfer sections, the resulting two-layer partial surface and an optionally remaining single-layer partial surface of the first heat transfer sections extend over the entire width of the metal strip and are arranged one behind the other in the longitudinal direction of the metal strip. This means that the metal strip after the formation of a heat transfer section not directly from this starting, forming a heat exchanger blade over to the other level, but initially completely bent and forming a second layer of the heat transfer section backwards again, until it at the rear End of this two-ply part surface, preferably about half of the longitudinal extent of the heat transfer section, is bent down and a heat exchanger blade training to the other level over, where it is bent in turn forward and the single-ply face or surface of a local heat transfer section forms. The course of the heat exchanger fins is preferably substantially orthogonal to the first and second levels of the heat exchanger fin module, but this need not be so and depends in particular on the desired two-ply coverage of the heat transfer sections.

According to a further advantageous feature, it is provided that the first heat transfer sections (2) are designed to be double-layered to 30% to 70%, preferably 40% to 60%, of the longitudinal direction (x). As a result, particularly stable embodiments can be formed.

A heat exchanger fin module according to the invention is also very stable because the metal strip constituting the heat exchanger fin module is superimposed in three layers in the first plane in triple overlapping regions, each forming at least a three-layered partial surface of the first heat transfer sections. wherein the resulting three-layer partial surface and an optionally remaining single-layer partial surface of the first heat transfer sections extend over the entire width of the metal strip and are arranged one behind the other in the longitudinal direction of the metal strip. This is realized, for example, in that the metal strip is flanged from the second plane to the first plane and leading out of the second plane and a second heat exchanger blade is bent toward the first plane, and then in the first plane again in the longitudinal direction bent in front to form a three-layer first heat transfer section in the first plane.

In order to achieve high stabilities and thermal conductivities, it is advantageous if the triple overlap region is not limited to the immediate vicinity of the fold, but extends over a certain extent in the longitudinal direction. According to a further advantageous feature, it is accordingly provided that the first heat transfer sections are formed in three layers to 30% to 70%, preferably 40% to 60%, of the longitudinal direction. For the same reason, it is advantageous if the first heat transfer sections are formed in one layer to less than 10% of the longitudinal direction, preferably only in the region of the fold, so that the first heat transfer sections essentially consist of a series of two- and three-layer partial surfaces exist, between adjacent two and three-ply faces only or only substantially in the region of the fold form a single-ply face, in which the metal strip changes in a one-sided course from one side of the first plane to the other side of the first plane.

The partially two-ply and three-ply formation of the first heat transfer sections in the first plane leads to a high stability of the same. At the same time it is possible by this design of the heat exchanger fin modules, the first heat transfer sections directly adjacent to line up and yet form heat exchanger fins that are orthogonal to the plane of the first heat transfer sections and thus a force that the first plane against the second Level push seeks to provide maximum resistance. At the same time, the heat exchanger plate modules can be produced by a purely mechanical deformation or cold forming of a metal strip. The metal strip may be made of any suitable material with good heat conduction z. B. aluminum, brass or copper.

Incidentally, in the present invention, "first level" and "second level" are not always understood to mean levels in the mathematical sense. Rather, these "planes" may also extend along a curved surface having a relatively large bend radius to allow, for example, a circular array of multiple heat exchanger fin modules rather than a strictly row-like arrangement. Furthermore, these "planes" are not necessarily in the mathematical sense without thickness, but may have a certain given by the thickness of the metal strip and its two- and three-layer formation, non-zero thickness.

The inherent stability of the heat exchanger fin module is further high in that in a remote from the two-ply faces rear transverse edge of the single-ply face of each first heat transfer section a recess for receiving a facing away from the single-ply face front edge of the two-ply face of the next adjacent first heat transfer section is formed so that adjacent first heat transfer sections can overlap in the longitudinal direction so far. In this case, therefore, the front transverse edges of the two-layered partial surfaces of the double overlapping regions are each formed in a recess formed at the rear transverse edge of the next adjacent, the double overlap region in the longitudinal direction following non-overlapping region by extending in the width direction of the folded metal strip, so that in Overlap longitudinal front portions of the two-ply faces and the rear portions of the single-ply faces each in a triple overlap region to form the three-ply faces of the first heat transfer sections.

Surprisingly, it has been found within the scope of the invention that both a high stability and a good heat conduction of a heat exchanger fin module according to the invention is achieved, even if the metal strip is only partially covered in the second level with second heat transfer sections, even if these only one layer are formed, and between the second heat transfer sections each having not covered by second heat transfer sections open sections, so that the second plane is formed as an alternating sequence of second heat transfer sections and open sections. The open areas provide great manufacturing advantages. In particular, the tool for forming the metal strip can be made much cheaper. Furthermore, fewer folds are required so that faster production is possible, and also allow the open portions to introduce into this and between the heat exchanger fins a pressing tool, with the in the first level superimposed faces of the heat transfer sections compressed at high pressure become to achieve high stability and good heat transfer.

A heat exchanger fin module according to the invention can be further optimized if the front edges of the two-layer partial surfaces of the first heat transfer sections are pressed against the recesses of the rear transverse edges of the single-layer partial surfaces of respectively adjacent heat transfer sections, in such a way that the contact pressure is fluid-tight. This fluid-tightness makes it possible for the heat-exchanger lamella module in particular to be able to flow through liquids without these being able to escape laterally out of the heat-exchanger lamella module. The heat exchanger lamella module thus forms fluid-tight channels between the individual heat exchanger lamellae.

Preferably, the heat exchanger fin module according to the invention is formed by a metal strip which is formed so that it forms to form a single-layer first heat transfer section and the fold forming obliquely to the first plane, then in the first plane in the longitudinal direction runs from, if the einlagige first heat transfer section is formed not only in the region of the fold, then flanged at a leading edge to the second plane and, resting on the heat transfer section, forming a two-ply face of the same, is fed back against the longitudinal direction, until it from the first Leading out level and a heat exchanger blade forming the second plane is bent away, and then bent in the second plane in turn in the longitudinal direction forward to form a second heat transfer section in the second plane, where it then at a second leading edge to the first level delt and leading out of the second plane and forming a second heat exchanger lamination bent to the first plane, and then in the first plane in turn bent longitudinally forward to form a three-ply first heat transfer section in the first plane , Then again to form a single-layer first heat transfer section and the fold extending obliquely to the first plane, etc. Accordingly, the machine production of the inventive heat exchanger fin module of a commercially available metal strip is correspondingly uncomplicated.

A further preferred embodiment of the invention is that in the heat exchanger fins as in the WO 2009/087106 A1 are formed substantially transversely and / or substantially longitudinally directed to the fluid flow beads to effect a better turbulence of the flowing through the heat exchanger fins fluid. Such swirling in the fin area increases the heat transfer from the heat exchanger fins into the fluid (and vice versa). For the same purpose, the heat exchanger fins as in WO 2009/087106 A1 can also be provided with breaks directed essentially transversely to the fluid flow. These can be very easily introduced into the heat exchanger fins. Finally, as in WO 2009/087106 A1, the heat exchanger fins of the heat exchanger fin module according to the invention can be provided with fluid flow-conducting bends in order to divert the fluid flow passing through the heat exchanger fins.

A heat exchanger fin module according to the present invention can be used in all types of heat exchangers. A particularly preferred application consists in electrical heating modules for heating an air flow, which comprise at least one PTC heating element and at least one heat-dissipating area adjoining the same and passing through it. In this heat dissipation region, at least one heat exchanger fin module is then arranged according to the invention, which is operatively connected to the PTC heating element, ie. H. is in heat-conducting connection and emits the heat from this in the sweeping through the heat exchanger fins module airflow.

A very good heat transfer from the PTC heating element in the heat exchanger fin module and there in the heat transfer sections is due to the peculiarity of the PTC heating element of particular importance; because this then takes on a lot of electrical power and converts it into heat, if it is held even at low temperature, so the heat generated by it is thus quickly and completely dissipated. The heat transfer between the PTC heating element and a heat exchanger fin module is in experience best when the heat exchanger fin module is pressed against the surface of the PTC heating element. The extremely high intrinsic stability of the heat exchanger fin module according to the invention is therefore of great advantage, especially in this field of application.

Since PTC heating elements are usually formed plate-shaped, an electric heating module is advantageously designed so that in each case at least one PTC heating element between two heat exchanger fin modules according to the invention is arranged, which rest with their heat transfer sections directly or indirectly on the PTC heating element. Thus, on the one hand, the heat generated in the PTC heating element is dissipated on both sides in the air flow, which increases the efficiency of the heating module, and on the other hand, the PTC Heating element then easily be contacted via the two heat exchanger fins modules electrically.

Between the PTC heating element and the heat exchanger fin modules, a metallic contact element can be arranged in each case. This then serves not only for electrical contacting, but also for a mechanical pressure distribution in order to avoid load peaks on the PTC heating element. As far as the PTC heating elements do not extend over the entire surface of the heat transfer sections of the heat exchanger fin modules, but on the other hand are smaller, such intermediate metallic contact elements also ensure a more uniform heat distribution in the heat exchanger fin modules. Furthermore, between the PTC heating element and a lamellar band module adjacent thereto, a so-called support element can be arranged which is electrically and thermally conductive, ie. H. preferably made of metal, and in particular the mechanical adjustment and the distribution of forces is used.

A further advantageous embodiment of an electric heating module according to the invention finally consists in that the PTC heating element is not formed as a plate-like structure, but as a fluid-flowable tube. In this case, the PTC heating element can then not only heat an air flow by means of the heat exchanger fin modules, but also a further fluid flow, in particular liquid flow, flowing through the PTC heating element. If required, such an electric heating module can even become a chilled air cooling unit, when the PTC heating element is turned off and a cooling fluid is passed therethrough.

The invention will be explained in more detail with reference to embodiments shown in the figures. The particularities then described may be used alone or in combination with one another to provide preferred embodiments of the invention. Show it:

1 a schematic side view of a rectangular shaped heat exchanger fin module according to the prior art,

2 1 is a schematic side view of a z-shaped formed heat exchanger fin module according to the prior art,

3 FIG. 2 is a schematic side view of a prior art S-shaped heat exchanger fin module; FIG.

4 a perspective view of a first heat exchanger fin module according to the WO 2009/087106 A1 .

5 a perspective view of a second heat exchanger fin module according to the WO 2009/087106 A1 .

6 a perspective view of a heat exchanger fin module according to the invention,

7 a side view too 6 .

8th a detail too 7 .

9 a view AA too 8th .

10 an exploded perspective view of a first electrical heating module according to the invention,

11 a perspective view of a second electrical heating module according to the invention and

12 an exploded perspective view of a third electrical heating module according to the invention.

The 1 to 3 show schematic side views of three examples of heat exchanger fin modules 1 According to the state of the art. They consist of a heat exchanger fins 2 reshaped metal band 3 , which defines in its elongated, band-shaped, unconverted initial state with its longitudinal direction x and its width direction y a first plane A, wherein the metal band 3 in the heat exchanger fin module 1 is reformed so that it regularly alternates back and forth between the first plane A and a second plane B, which is parallel to the first plane A, around a number of heat exchanger fins connecting the first plane A and the second plane B. 2 to form, which are arranged one behind the other in the longitudinal direction x and can be flowed through by a fluid. The metal band 3 forms in the first level A first heat transfer sections 4 and in the second level B second heat transfer sections 5 ,

In the heat exchanger lamella module 1 from 1 are the heat exchanger fins 2 formed in rectangular meanders, resulting in both the stability and the total area of the heat transfer sections 4 . 5 are not optimal. The heat exchanger lamella module 1 from 2 has a z-shaped or triangular folding of the heat exchanger fins 2 what, although the coverage of the levels A and B through the heat transfer sections 4 . 5 optimized, however, in terms of its Intrinsic stability can be improved. The heat exchanger lamella module 1 from 3 has s-shaped or sinusoidally shaped heat exchanger fins 2 which in turn is detrimental to intrinsic stability. In all cases, the first level A and the second level B are the same. The flow resistance for the in the y-direction between the heat exchanger fins 2 flowing fluid is in the embodiment of 3 bigger than at 2 and at 2 bigger than at 1 ,

In the 4 is an improved heat exchanger fin module 1 according to the prior art shown in a perspective view. It is made of a metal band 3 made, the back and forth between a first plane A and a second plane B and thereby in the first plane A first heat transfer sections 4 and in the second level B second heat transfer sections 5 forms, while the connectors between the planes A and B vertical heat exchanger fins 2 form. The metal band 3 has been reshaped to form a first heat transfer section 4 lying in the first plane A, where there is a single-ply face 6 the first heat transfer section 4 forms, then at a leading edge 7 crimped towards the second plane B and on the first heat transfer section 4 overlying, a two-ply partial surface 8th forming, was fed back against a longitudinal direction x until it out of the first plane A and a heat exchanger blade 2 has been bent toward the second plane B, and then in the second plane B in the longitudinal direction x to the front - in the representation so to the right - is bent to a subsequent single-layer first heat transfer section 4 to form B in the second level.

In the second level B is the metal band 3 then again at a leading edge 7 crimped to plane A and, on the second heat transfer section 5 overlying, a two-ply partial surface 8th forming, been recycled until it led out of the second level B and another heat exchanger lamella 2 forming bent to the first plane A, etc., The leading edges 7 the first and second heat transfer sections 4 . 5 lie in each case at the rear transverse edges 9 the respective adjacent heat transfer sections, so that essentially how 4 illustrates, in both the first level A and in the second level B, a closed surface of juxtaposed first heat transfer sections 4 or second heat transfer sections 5 formed. Because the heat exchanger fins 2 orthogonal to the planes A and B and the substantially closed formation of the heat transfer sections 4 . 5 desired, results from geometric necessities that the heat transfer sections 4 . 5 each half about two layers and the other half are single-layered. For the illustrated heat exchanger fin module 1 good stability results, in particular in a direction perpendicular to the planes A and B direction.

In 5 is a further improved heat exchanger lamella module 1 according to the prior art shown in a perspective view. The difference of this embodiment from that of 4 is that the heat transfer sections 4 . 5 are no longer just strung together, but overlap slightly, wherein in the overlap region in the longitudinal direction x short three-layer sections or three-ply faces 10 result. The single ply faces 6 the heat transfer sections 4 . 5 are each with a recess 11 provided, the leading edge 7 the next adjacent heat transfer section 4 . 5 is adjusted. The recesses 11 become by in the width direction y extending bends 12 of the metal band 3 formed and in the area of a fold 12 the metal band runs 3 single layer from one side to the other from the heat transfer sections 4 . 5 formed levels A, B.

Because the single-ply faces 6 the heat transfer sections 4 . 5 each with a recess 11 are provided, the front edge 7 the next adjacent heat transfer section 4 . 5 adjusted, this can be a short distance into the single-ply face 6 the heat transfer section 4 . 5 reach in and the heat transfer sections 4 . 5 nevertheless form essentially a flat surface in the planes A, B. Accordingly, the two-ply face 8th and the single-ply face 6 each heat transfer section 4 . 5 not the same size, because the heat exchanger fins 2 here again perpendicular to the levels A and B stand. The leading edges 7 the heat transfer sections 4 . 5 are so in the recesses 11 pressed, that results in a fluid-tight connection. The spaces between the heat exchanger fins 2 thus form fluid-tight channels.

In the known heat exchanger lamella modules 1 according to the 4 and 5 the first plane A is in each case identical to the second plane B and the second heat transfer sections 5 cover the second level B completely.

The 6 and 7 show an embodiment of a heat exchanger fin module according to the invention 1 . 6 in a perspective view and 7 in a side view. The first level A with the first heat transfer sections 4 In this case, its structure corresponds to that of the Level A of the heat exchanger fin module 1 from 5 with the following two differences. First, the first heat transfer sections 4 not only in the immediate area of the recesses 11 three-layered, but the three-layer training extends over a longer range in the longitudinal direction x, for example, to 30% to 70%, preferably 40% to 60% of the longitudinal direction x of the first heat transfer sections 4 or the length of the heat exchanger fin module 1 , On the other hand, the first heat transfer sections 4 according to the illustrated preferred embodiment to less than 10% of the longitudinal direction x of the first heat transfer sections 4 or the length of the heat exchanger fin module 1 , preferably only in the area of the fold 12 single-layered. Both differences increase in comparison to the known training, both the stability and the heat conduction.

A particularly striking difference between the prior art according to 5 and a heat exchanger fin module according to the invention 1 according to the 6 and 7 However, shows in the formation of the second level B with the second heat transfer sections 5 , The second level B is only partially with second heat transfer sections 5 covers and points between the second heat transfer sections 5 not by second heat transfer sections 5 covered open sections 13 on, so that the second level B as an alternating sequence of second heat transfer sections 5 and open sections 13 is trained. Through the open sections 13 can the heat exchanger fin module according to the invention 1 be made with very low tooling costs, while still achieving both high stability and good thermal conduction properties. Further, in the manufacture of the heat exchanger fins module 1 easily through the open sections 13 Tools between the heat exchanger fins 2 introduced, for example, a pressing tool for compressing the multilayer first heat transfer sections 4 , This allows a cheap and high quality production.

According to a further advantageous feature, as in the 6 and 7 illustrated the second heat transfer sections 5 be formed single-layered. This simplifies the production of the heat exchanger fin module 1 and allows good heat transfer in this area over only one material thickness. Furthermore, for design reasons and to simplify the production as shown, it may be provided that the length (measured in the longitudinal direction x) of the second heat transfer sections 5 the length (measured in the longitudinal direction x) of the two-ply partial surfaces 8th the first heat transfer sections 4 equivalent. For the same reason it can be provided that as shown the length (measured in the longitudinal direction x) of the open sections 13 the second plane B of the length (measured in the longitudinal direction x) of the three-ply faces 10 the first heat transfer sections 4 equivalent.

To increase the stability of the heat exchanger fin module 1 can be provided that in edges of the metal strip 3 that from second heat transfer sections 5 and of heat exchanger fins 2 are formed, substantially perpendicular to the metal strip 3 directed beads 14 are formed. In the embodiment of the 6 and 7 is in each case such an edge in each case a bead 14 formed, approximately in the middle of extending in the width direction y edges. The beads 14 be in the 8th and 9 illustrated enlarged again. It becomes clear that it is in particular due to the present invention open sections 13 is possible in the manufacture of a heat exchanger fin module 1 from a metal band 3 such beads 14 to mold into the edges.

The 10 shows in a schematic exploded perspective view of an example of an electric heating module 15 , It comprises a heat exchanger arrangement of two heat exchanger lamella modules 1 of the type, as in the 6 to 9 is shown. Two heat exchanger lamella modules 1 are arranged one above the other. The gap between them could allow fluid to pass through in other applications. In the present case, here is a heating element, namely a PTC heating element 16 used, in the assembled state of the heating module 15 in electrical and thermally conductive connection to the first heat transfer sections 4 the two heat exchanger lamella modules 1 stands, absorbs electricity from these and gives off to this heat. Alternatively or additionally, it may also be provided between the first heat transfer sections 4 the two heat exchanger lamella modules 1 and the PTC heating element 16 in each case a plate-shaped element, for example a metallic contact element 17 and / or a support element 18 insert.

The 11 shows a modification 10 with three superimposed heat exchanger lamella modules 1 , The 12 shows a further modification 10 with two in the flow direction of the heated fluid, which corresponds to the width direction y, one behind the other arranged heat exchanger fin modules 1 on one side of the two PTC heating elements 16 and a larger common heat exchanger fin module 1 on the other side of the two PTC heating elements 16 ,

LIST OF REFERENCE NUMBERS

1

Heat exchanger fins module

2

Heat exchanger fin

3

metal band

4

first heat transfer sections

5

second heat transfer sections

6

single-layer partial surface

7

leading edge

8th

two-ply part surface

9

transverse edge

10

three-layer partial surface

11

recess

12

fold

13

open section

14

Beading

15

electric heating module

16

PTC heating element

17

contact element

18

support element

A

first floor

B

second level

x

longitudinal direction

y

width direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0350528 A1 [0009]
• WO 2009/087106 A1 [0009, 0012, 0027, 0037, 0038]
• EP 0350528A [0010]

Claims (15)

Heat exchanger lamella module ( 1 ), consisting of a heat exchanger fins ( 2 ) formed metal strip ( 3 ), which defines in its stretched, band-shaped, unformed initial state with its longitudinal direction (x) and its width direction (y) a first plane (A), wherein the metal strip ( 3 ) in the heat exchanger fin module ( 1 ) is recirculated regularly between the first plane (A) and a second plane (B) parallel to the first plane (A), to reciprocate a number of the first planes (A) and the second level (B) connecting heat exchanger fins ( 2 ), which are arranged one behind the other in the longitudinal direction (x) and can be flowed through by a fluid, in the first plane (A) substantially flat first heat transfer sections (FIG. 4 ), which line up in the longitudinal direction (x) and cover the first plane (A) at least partially, preferably completely, in the first plane (A) in non-overlapping regions, each having at least one single-layer partial surface (A). 6 ) of the first heat transfer sections ( 4 ), is formed in one layer, in the first plane (A) in Zweifachüberlappungsbereichen, each having at least one two-ply face ( 8th ) of the first heat transfer sections ( 4 ), in two layers superimposed, and in the first plane (A) in triple overlap areas, each having at least one three-ply face ( 10 ) of the first heat transfer sections ( 4 3), wherein the non-overlapping areas, the double overlapping areas and the triple overlapping areas of the first heat transfer sections (FIG. 4 ) each in the longitudinal direction (x) of the metal strip ( 3 ) are arranged one behind the other and over the entire width of the metal strip ( 3 ), the front transverse edges ( 9 ) of the two-ply faces ( 8th ) of the double overlap areas each in a recess ( 11 ) formed at the rear transverse edge ( 9 ) of the next adjacent non-overlapping area following the double overlap area in the longitudinal direction (x) by a fold extending in the width direction (y) ( 12 ) of the metal strip ( 3 ) are formed, so that in the longitudinal direction (x) front portions of the two-ply faces ( 8th ) and the rear regions of the single-layer partial surfaces ( 6 ) overlap each other in a triple overlap area to the three-ply faces ( 10 ) of the first heat transfer sections ( 4 ), and the metal strip ( 3 ) in the second plane (B) substantially planar second heat transfer sections ( 5 ), which are arranged one behind the other in the longitudinal direction (x), characterized in that the second plane (B) only partially with second heat transfer sections ( 5 ) and between the second heat transfer sections ( 5 ) in each case not by second heat transfer sections ( 5 ) covered open sections ( 13 ), so that the second plane (B) as an alternating sequence of second heat transfer sections ( 5 ) and open sections ( 13 ) is trained. Heat exchanger lamella module ( 1 ) according to claim 1, characterized in that the first heat transfer sections ( 4 ) to less than 10% of the longitudinal direction (x), preferably only in the region of the fold ( 12 ) are formed in one layer. Heat exchanger lamella module ( 1 ) according to one of the preceding claims, characterized in that the first heat transfer sections ( 4 ) to 30% to 70%, preferably 40% to 60% of the longitudinal direction (x) are formed in two layers. Heat exchanger lamella module (1) according to one of the preceding claims, characterized in that the first heat transfer sections ( 4 ) to 30% to 70%, preferably 40% to 60% of the longitudinal direction (x) are formed in three layers. Heat exchanger lamella module ( 1 ) according to one of the preceding claims, characterized in that the leading edges ( 7 ) of the two-ply faces ( 8th ) of the first heat transfer sections ( 4 ) substantially fluid-tight to the recesses ( 11 ) of the rear transverse edge ( 9 ) of the single-layer partial surfaces ( 6 ) each adjacent first heat transfer sections ( 4 ) are pressed. Heat exchanger lamella module ( 1 ) according to one of the preceding claims, characterized in that the second heat transfer sections ( 5 ) are formed in one layer. Heat exchanger lamella module ( 1 ) according to one of the preceding claims, characterized in that the length of the second heat transfer sections ( 5 ) the length of the two-ply faces ( 8th ) of the first heat transfer sections ( 4 ) corresponds. Heat exchanger lamella module ( 1 ) according to one of the preceding claims, characterized in that the length of the open sections ( 13 ) of the second level (B) of the length of the three-ply faces ( 10 ) of the first heat transfer sections ( 4 ) corresponds. Heat exchanger lamella module ( 1 ) according to one of the preceding claims, characterized in that in edges of the metal strip ( 3 ), of second heat transfer sections ( 5 ) and of heat exchanger fins ( 2 ) are formed, substantially perpendicular to the metal strip ( 3 ) directed beads ( 14 ) are formed. Heat exchanger lamella module ( 1 ) according to one of the preceding claims, characterized in that the metal strip ( 3 ) is formed so that it is for forming a single-layer first heat transfer section ( 4 ) and the fold ( 12 ) forming obliquely to the first plane (A), then running in the first plane (A) in the longitudinal direction (x) to, if the single-layered first heat transfer section ( 4 ) not only in the area of the fold ( 12 ) is formed, then at a leading edge ( 7 ) is crimped to the second level (B) and, at the heat transfer section ( 4 ), a two-layer partial surface ( 8th ) of the same, opposite to the longitudinal direction (x) is returned, until it out of the first plane (A) leading out and a heat exchanger blade ( 2 ) is bent towards the second plane (B), and then in the second plane (B) in turn in the longitudinal direction (x) is bent away from to a second heat transfer section ( 5 ) in the second plane (B), where it then at a second leading edge ( 7 ) is flanged towards the first plane (A) and leading out of the second plane (B) and a second heat exchanger blade ( 2 ) is bent to the first plane (A), and then in the first plane (B) in turn in the longitudinal direction (x) is bent forward to a three-layer first heat transfer section ( 4 ) in the first plane (B) and then again to form a single-layered first heat transfer section (FIG. 4 ) and the fold ( 12 ) forming obliquely to the first plane (A), etc. Heat exchanger lamella module ( 1 ) according to one of the preceding claims, characterized in that the heat exchanger fins ( 2 ) are substantially orthogonal to the first and second planes (A, B). Heat exchanger, characterized in that it comprises at least one heat exchanger lamella module ( 1 ) according to one of the preceding claims. Electric heating module ( 15 ) for heating an air stream comprising at least one PTC heating element ( 16 ) and at least one adjoining, air-flowable heat dissipation area, in which at least one heat exchanger fin module ( 1 ) according to one of claims 1 to 11, which is connected to the PTC heating element ( 16 ) is in thermally conductive connection. Electric heating module ( 15 ) according to the preceding claim, characterized in that at least one PTC heating element ( 16 ) between two heat exchanger lamella modules ( 1 ) is arranged and these with their heat transfer sections ( 4 ) directly or indirectly on the PTC heating element ( 13 ) rest. Electric heating module ( 15 ) according to one of claims 13 to 14, characterized in that the PTC heating element ( 16 ) is designed as a fluid-flowable tube.

Images