WO2012150219A2

WO2012150219A2 - Electrical heating module for airflow heating

Info

Publication number: WO2012150219A2
Application number: PCT/EP2012/057924
Authority: WO
Inventors: Gerhard KNIEPS
Original assignee: MicroHellix GmbH
Priority date: 2011-04-30
Filing date: 2012-04-30
Publication date: 2012-11-08
Also published as: ES2495424T3; PL2519076T3; EP2519076A3; WO2012150219A3; EP2519076B1; DE202011100054U1; EP2519076A2

Abstract

The invention relates to an electrical heating module for airflow heating. Said electrical heating module comprises at least one planar PTC element having a first contact surface and a second contact surface, a heat output region, through which air can flow and in which thermally conductive fins are arranged, which fins are connected to the PTC element in a thermally conductive manner, and a thermally and electrically conductive core, which bears the fins and which can be divided into a first core part and a second core part, wherein the PTC element is arranged between the first core part and the second core part and lies against the first core part at the first contact surface of the PTC element and against the second core part at the second contact surface of the PTC element. Furthermore, a fastening element is provided, which passes through the first core part, the PTC element, and the second core part and fastens the first core part, the PTC element, and the second core part to one another.

Description

Electric heating module for air flow heating

description

The invention relates to an electrical heating module for air flow heating according to the preamble of the appended claim 1 as well as extruded, cast or Extrusionsprofüe that can be used in such an electric heating module.

Accordingly, a heating module of the present type comprises at least one planar PTC element with a first and a second contact surface, as well as an airflowable heat dissipation region in which thermally conductive fins are arranged which are in operative connection with the PTC element. The PTC element is arranged between a first part and a second part of a heat and current conducting core and has with its first contact surface on the first core part and with its second contact surface on the second core part. The PTC element thus gives off heat to the two core parts and can be electrically contacted simultaneously via the two core parts. The heat and current core also carries the fins which heat a stream of air passing through the heat delivery area.

PTC elements are semiconductor resistors made of ceramic whose ohmic resistance is temperature-dependent. The resistance-temperature characteristic behaves non-linearly: The resistance of a PTC heating element initially decreases slightly with increasing component temperature, then rises very steeply at a characteristic temperature (reference temperature). This overall positive characteristic of the resistance temperature characteristic curve (PTC = Positive Temperature Coefficient) leads to a PTC heating element having self-regulating properties. At a temperature significantly lower than the reference temperature, the PTC heating element has a low resistance, so that correspondingly high currents can be passed through. If for a Good heat dissipation is provided by the surface of the PTC heating element, so a corresponding amount of electrical power is absorbed and released as heat. However, as the temperature of the PTC heater rises above the reference temperature, the PTC resistance 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 absorption of the surroundings of the PTC heating element. Under normal environmental conditions, the component temperature of the PTC heating element can therefore not rise above a characteristic maximum temperature, even if the desired heat dissipation in the event of a fault is completely interrupted. This and the self-regulating properties of a PTC heating element, based on which the absorbed electrical power corresponds exactly to the thermal output, predestine PTC heating elements for use in heating or air conditioning systems of vehicles or in other applications of air flow heating in vehicles or residential areas , Because of safety reasons, no flammable temperatures may arise in the heating element in these applications even in case of failure, yet a high heating capacity is required in Normaibetrieb.

For the interior heating of motor vehicles, it is already known to use electric heating modules with a frame that combines a plurality of PTC heating elements and adjoining, through-flowable heat-dissipating areas with heat-conducting lamellae to form a module. An example of such known electric heating modules can be found in EP 0 350 528 A1.

EP 1 479 918 A1 discloses a complete fan module consisting of a radial fan integrated in a housing and a heating module intended for seat heating in a ventilated motor vehicle seat. Since a motor vehicle seat for safety reasons, even at failure of the fan on the surface of a maximum temperature that is tolerable for humans, must not exceed, heating modules with PTC heating elements are ideal, especially as they with the same security a much higher heating capacity than the mats conventionally used in seat heaters with electrical resistance wires whose power consumption must be very limited for safety reasons.

The previously known electric heating modules with PTC elements are in the morning! consisting 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 their lower sides with contact plates. The adjoining heat dissipation areas have meandering arranged metal fins, which are also with their narrow side in the air flow and thermally contact the contacting plates of the PTC Heizeiemente at regular intervals for heat transfer on its broad side. In order to achieve a good heat dissipation from the PTC heating elements to the heat-conducting lamellae, heat-conducting adhesives or other bonding techniques can be used; However, it has become the most efficient solution to put the PTC heating elements and the heat-conducting fins in a module summarizing this frame and to provide within the frame at least one spring element, the alternately arranged heat dissipation areas with thermally conductive fins and the webs with the PTC Heaters pressed together.

However, this requires a rectangular shape of the electric heating module with line-like structuring of the components, which in terms of flow to the air flow heating, especially not optima! is when the space for corresponding air flow channels as in a motor vehicle is very limited. In this respect, it was logical for the fan module for motor vehicle seats according to EP 1 479 918 A1 to use a radial fan. However, as is known, radial fans are rather less suitable for this purpose.

In addition, the production of the known electric heating modules due to their multi-layer, spring-loaded construction within a frame is hardly possible machine. Rather, a lot of manual work is necessary. In DE 20 2005 012 394 U1, therefore, an electric heating module of the type mentioned is proposed with an annular, in particular circular heat dissipation area, in which the heat-conducting fins are arranged substantially radially. This simplifies the assembly, especially if it is to be automated, and increases the efficiency of the heat transfer to the guided through the slats or the heat dissipation area airflow. Another example of a blower module for motor vehicle seats can be found in EP 1 464 533 A1. An example of a heating module, which is provided in the manner of a hair dryer with a fan and drag wires in the air flow, is described in US 6,541, 737 B1. In DE 10 2007 006 058 A1 discloses an electric heating module of the type mentioned with improved ease of installation is disclosed. The slats used there are supported by a thermally conductive retaining ring. If two such retaining rings are used with corresponding lamellar rings, these form a divisible, heat and stromieitenden core which is divisible into a first and a second core part. Between these two core parts a flat PTC element is inserted so that an electrically conductive and at the same time heat-conducting contact between the two contact surfaces of the PTC element and one core part results. To protect the PTC element from environmental influences from the outside, a circumferential seal is inserted between the two core parts, which surround the PTC element and seal between the two core sides. In an alternative embodiment, a frame member provides for the sealing of the gap between the two core parts in which the PTC element sits. The heat-conducting lamellae of this prior art according to DE 10 2007 006 058 A1 are, as in the other prior art mentioned above, made of bent and folded metal sheets. Although this can be done by machine, the fitting of the lamellae into the core parts is quite and leads to a not very high intrinsic stability of the component of the overall module, which is formed from laminated ring and core part.

At the same time, it is essential for effective heat dissipation from the PTC element into the core parts that a permanent contact force acts between the PTC element and the core parts. Due to the above-described profile of the resistance temperature characteristic of the PTC element, its current consumption decreases when the heat is not dissipated efficiently, so that the performance of the heating element decreases when the heat transfer is not optimally designed.

In the prior art according to DE 10 2007 006 058 A1, therefore, a spring element is provided, as is the case in the other documents cited, which is pretensioned during assembly. The bias is maintained by means of a Haltekiammer. In an alternative embodiment spring clips are used, which exert a permanent bias on the two core parts with intermediate PTC element.

Spring elements, which must be biased during assembly and ensure that assemblies of the heating module must be mounted and held under bias, however, complicate the assembly and make in all dirge! Need manual work. In particular, in connection with the mentioned low intrinsic stability of Lamelienpaketen of bent and folded metal sheets prepare the forces that must be applied when mounting for biasing the spring elements, special difficulties during installation.

Based on this prior art, the present invention seeks to improve the ease of installation of an electric heating module of the present type by constructive modifications.

This object is achieved by an electric heating module having the features of the appended claim 1. Preferred embodiments of the erfindungsge- MAESSEN heating module are laid down in claims 2 to 1 1. Extruded, cast or extruded profiles which can be used in an electric heating module according to the invention can be found in the claims 12 to 17. s The present invention makes spring elements and assembly work with prestressed assemblies superfluous, because according to the invention a fastener is present, the first Core part, the PTC element and the second core part passes through and sets together, in particular by means of mutually aligned holes in these components. Such a fastening element may consist of a screw-nut combination; However, there are also all other types of attachment, such as a rivet connection, a connector with retaining rings or cotter pins, etc. in the context of the present invention can be used as a fastener. Naturally, a screw connection is particularly easy to assemble.5

In order to be able to compensate for possible thermal stresses and mechanical loads, it is preferable to provide the fastening element with a spring element which biases the first core part, the PTC element and the second core part elastically against each other. This spring element can be integrated into the fastening element or arranged as a spring washer, soft-elastic coating and the like somewhere between the components involved.

By means of the fastening element according to the invention, the two Kernteile5 and the PTC element are stable and permanently fixed to one another with a defined bias and with a correspondingly good heat dissipation from the PTC element into the core parts, so that this module can be mounted very easily. By virtue of this configuration, moreover, a housing into which the present electrical heating module is preferably installed together with a fan can be kept free from holding forces and counterforce resulting from spring elements which have been used in the prior art. The electrical heating module according to the invention can therefore be easily inserted into a housing or clicked over a snap connection Be what the installation of a heating module with housing and fan, as it is installed, for example, in vehicle seats for heating and ventilation of the same, again significantly simplifies.

According to a particularly preferred development of the present invention, the fastening element is designed to be electrically conductive and serves as power supply to either the first or the second core part. For this purpose, it preferably sits in an electrically insulating sleeve, which extends at least over one of the two core parts and the PTC element away. The PTC element can then be electrically contacted from only one side. By way of example, a first electrical lead is connected to the first core part, and a second electrical lead is connected to the fastening element, which is electrically insulated from the first core part. This is in electrically conductive connection with the second Kernteii, so that the PTC element is electrically contacted via the two adjacent each of a core part surfaces, although the leads advantageously within the projection of the PTC element and radially within the heat dissipation area, so only are located on either the upstream or the downstream side of the PTC element and do not shade the heat release area.

The electrical contacting is preferably further simplified in that the sleeve, which surrounds the fastening element in an electrically insulating manner, protrudes outside the bores of the core parts and of the PTC element into a disk, which is arranged between two electrical contact elements, in particular cable ring sleeves, and these are electrically connected to one another separates. A first of these two electrical contact elements then sits between the projecting disk and the first core part, so that in this way the first core part is contacted, while the second electrical contact element sits between the disk and the securing or cantilevered part of the fastening element. Depending on the type of fastener, this projecting part may be a nut, a screw head, a rivet, a washer, a spacer, a split pin, or the like. According to a further particularly preferred embodiment of the invention Heizmoduis the heat-conducting fins are no longer, as in the prior art, manufactured as bent and folded metal sheets, but made as an extruded profile, in particular of aluminum or aluminum alloys, which are intrinsically stable and particularly good heat conducting. In particular, it is advantageous to manufacture the extruded profile in such a way that it covers the entire heat dissipation area as an integral heat dissipation block. This increases the inherent stability of this component and simplifies the assembly, since it then only has to be plugged together with the core or one of the two core parts and possibly compressed there.

In the context of the present invention may instead of an extruded profile, which in particular consists of aluminum or an aluminum alloy, but may also consist of other thermally conductive materials, also a

Cast profile, for example, produced by die casting, injection molding or other casting method, and an extrusion profile can be used, for the latter in particular thermally conductive plastics can be used.

Preferably, a first extrusion, casting or extrusion profile sits on the first core part and a second profile on the second core part.

Such an extruded, cast or extruded profile has several advantages: This includes the possibility of creating an optimum heat transfer between the core part and the heat dissipation area by circulating pressing with the respectively associated core part. Furthermore, it is possible and preferable to design the heat-conducting lamellae of the extruded profile in such a way that their cross section in the flow direction decreases with increasing distance from the core, which increases the efficiency of the heat conduction within the lamellae and the efficiency of heat dissipation from the lamellae to the air flow flowing through , The efficiency of the heat transfer from the lamellae to the air flow flowing through can advantageously also be increased by virtue of the fact that the heat-conducting lamellae have a substantially black surface. Insofar as the lamellae consist of aluminum or an aluminum alloy, this can expediently be carried out in the Eioxierverfahren, so that the heat-conducting lamellae have a black anodized surface.

Finally, it is possible and preferred to shape the thermally conductive fins such that they form a stem from the core and this strain branches at least once into two or more branches as it is removed from the core. As a result, the heat dissipation region can be uniformly structured, create a particularly large surface of the heat-conducting lamellae, at which the heat transport into the air flow takes place, and achieve particularly low air flow losses. This increases the heat transfer, improves the response time and efficiency of the heating module and reduces airflow noise. Furthermore, smaller fans can be used for the same effect.

Overall, the present invention thus enables an axle assembly of an electrical heating module with a sandwich-type construction with a central fastening element which simultaneously electrically contacts the PTC element. The heat dissipation region can here, as well as the PTC element and the core parts, seen in the flow direction, be circular, flattened or oval or polygonal, for example rectangular or trapezoidal.

The present invention also includes extruded, cast or extruded profiles with heat-conducting lamellae, which are intended in particular for use in a heat-dissipating area of an electric heating module according to the invention, ie can be part of such an electric heating module in the context of the present invention; At the same time, however, the profiles according to the invention can also be used elsewhere. As mentioned, in the context of the present invention extruded, cast and extruded Profiles to understand profiles that have been produced in any casting process, in particular die casting and injection molding, or in an extrusion or extrusion process. Suitable materials for this are all castable and / or extrudable, heat-conducting materials in question, in particular aluminum and aluminum alloys, but also other metals such as copper and copper alloys, or else heat-conductive plastics and ceramic materials. In all cases, it is preferred in the context of the present invention if the heat-conducting lamellae of the profile have a substantially black, in particular black anodized surface. This improves the heat transfer in the passing air stream.

A first profile according to the invention comprises heat-conducting lamellae, of which at least one subset is in each case shaped in such a way that the lamellae form a stem which extends essentially radially outwards from the core, and this trunk becomes at least once in two or more as the distance from the core increases more branches branches. In this case, with increasing distance from the core of the flow shading cross-section of the individual slats can be reduced. This is not disadvantageous in terms of the heat conduction within the fins, since the amount of heat to be transmitted decreases radially outward, while it brings because of the increasingly decreasing shading of the throughflow projection surface fluidic advantages. At the same time, the branch increases the heat transfer surface from the fins to the air flow, which significantly improves the heat transfer into the air flow. Finally, the branching and the penetration of the heat-dissipating area with heat-conducting lamellae or branches ensures a substantially laminar flow through the heat-dissipating area, which in turn is advantageous in terms of flow.

A second extrusion, casting or extrusion profile according to the present invention has at least a subset of thermally conductive fins formed to form a stem extending substantially radially away from the core, to which a plurality of substantially is formed perpendicular to the main extension direction of the trunk from this forthcoming branches. These branches are preferably formed with increasing distance from the core increasingly iänger so that they penetrate the largest possible area of the heat dissipation area. The advantages and effects of this embodiment correspond approximately to those of the profile described above with lamellae forming a trunk with branches.

A third profile according to the present invention has a heat spreader ring which is radiai spaced from and revolves around the core, and which is provided with heat conducting fins extending radially inwardly to the core. Preferably, the heat distribution ring is also provided radially outwardly with heat-conducting fins. The heat distribution ring may be closed, but this is not always necessary.

A particularly preferred variant of a profile according to the invention consists of at least two modules, which can be assembled, wherein a first module surrounds the core and is thermally conductively connected thereto, and a second module is attachable to the first module so that it surrounds and with this is thermally conductively connected. Optionally, there are still third and fourth modules, etc., which can be applied radially outward to increase the heat dissipation area. This makes it possible to adapt the heat dissipation area to different fan diameters, which can be attached to the electric heating module and form with it a heating fan.

At this point, it should again be noted that the extruded, cast or extrusion profiles according to the invention are preferably formed in a circular projection, but this need not be. In the context of the present invention are rather also profiles that are poiygonförmig in their projection, for example rectangular, or oval or flattened. This is especially true for the inventive profile with heat distribution ring. Furthermore, the different variants of profiles described above can also be combined in the context of the present invention. An exemplary embodiment of an inventive electric heating module and Ausführungsbeispieie for inventively designed profiles are described and explained in more detail below with reference to the accompanying drawings. Show it:

Figure 1 is a schematic side sectional view through an inventively constructed electric Heizmodui;

Figure 2 is a view like Figure 1, wherein the heating module is installed together with a fan in a housing;

Figure 3 is a perspective view of the assembly of Figure 2;

Figure 4 is a schematic plan view of a first embodiment

a profile, here an extruded profile;

Figure 5 is a schematic plan view of a second embodiment of a profile;

Figure 6 is a schematic plan view of a third embodiment

a profile;

Figure 7 is a schematic plan view of a fourth embodiment

a profile;

The electric heating module shown schematically in section in FIG. 1 has as its center a flat PTC element 1 which, surrounded by a sealing ring 2, sits between a first core part 3 and a second core part 4. The sealing ring 2 ensures that the PTC element 1 is protected from external influences protected from the outside. Placed on the first core part 3, there is a first heat-dissipating block 5, which consists of an aluminum extruded profile, which surrounds the first core part 3 in a circular manner, forms a multiplicity of essentially radially extending heat-conducting lamellae. These will be described in more detail later with reference to FIG. A second heat release block 6 sits on the second core part 4. The heat release blocks 5 and 6 cover a heat release region 7, which is traversed by air to be heated with an air stream 8.

The flat PTC element 1 has on the upper side a first contact surface 9 and on its lower side a second contact surface 10, these two contact surfaces 9, 10 being used both for electrical contacting of the PTC element 1 and for heat dissipation. For this purpose, the first contact surface 9 on the first core part 3 and the second contact surface 10 on the second core part 4. In order to ensure, in particular, good heat dissipation from the contact surfaces 9, 10, the first core part 3, the PTC element 1 and the second core part 4 are held together by a fastening element 1 1 biased against one another. As can be seen, this fastening element passes through the said three components 1, 3, 4, in the present embodiment by means of central bores; Accordingly, the PTC element 1 is present in the form of a perforated disk.

The fastener 1 1 consists in the present embodiment of a cylinder screw 12 with a head 3 with square inner and a shank 14 which passes through the holes in the two Kernteiien 3, 4 and the PTC element 1. On the (not explicitly shown) thread of the cylinder screw 12, a hex nut 15 is screwed and secured by a toothed wheel 16. A spring washer 17 between the head 13 of the cylinder screw 12 and the second core part 4 ensures a permanent, defined biasing force, which is exerted by the fastening element 11 on the core parts 3, 4 and of these on the PTC Eiement 1. Since the fastener 1 1 not only for applying forces to said components and for fixing them together, but also for electrical contacting of the PTC element 1 is used, the shank 14 of the cylinder screw 12 is surrounded by an insulating sleeve 18, a electrical insulation between the fastener 1 1 and the first core part 3 and the PTC element 1 ensures. With the second core part 4, the fastening element 1 1 is electrically connected, on the one hand directly in the bore and in particular on the other indirectly via the spring ring 17th

The Isolierhüise 18 protrudes laterally above the first core part 3 and forms a Lochscheibentei! 19. This creates an electrical insulation between the first core part 3 and the components electrically connected to the fastener 1, such as the hexagon nut 15 and the toothed disc 16. Between the perforated disc part 19 of the insulating sleeve 18 and the toothed disc 16 sits a first Kabelringöse 20, the can be contacted electrically via a first cable lug 21. A washer 22 between the toothed disc 16 and the first cable eyelet 20 ensures optimum pressure distribution and optimum electrical contact from the cable lug 21 via the first cable eyelet 20, the toothed disc 16, the hexagon nut 15, the cylinder screw 12, and the spring washer 17 in the second core part 4.

Below the perforated disc part 19 of the insulating sleeve 18, a second Kabelringöse 23 is arranged with a second cable lug 24. This second cable eyelet 23 is electrically isolated by means of the insulating sleeve 18 against the fastening element 1 and at the same time is in electrical contact with the first core part 3, since it rests on this. Accordingly, the second core part 3 can be electrically contacted via the second cable lug 24. Although both cable lugs 21, 24 are arranged in the central region of the heating module and both are accessible from above, yet both contact surfaces 9, 10 of the horizontally inserted PTC element 1 can be supplied with electric current. At the same time, the exemplary embodiment illustrated in FIG. 1 offers the advantage that a single, centrally arranged fastening element 1 1 ensures both a mechanical cohesion of the heating module and a very good heat dissipation from the PTC element 1 into the heat release blocks 5, 6 and moreover a robust and efficient ensures electrical contacting of the PTC element 1 at an easily accessible location of the heating module. This fastener 1 1 is also easy to install and set, so that the electric heating module is not only a whole lot easier to assemble, as in the prior art, but also has a high efficiency in its operation.

In FIG. 2, again in a schematic lateral section, the electrical heating module from FIG. 1 is shown, so that identical components are provided with identical reference symbols. FIG. 2 shows a typical installation situation of the present electric heating module in a vehicle seat in order to be able to ventilate and / or heat it. Due to the compact and stable design of the electric heating module, this can be easily clipped into a housing 25 by means of snapping detent elements 26, wherein a commercially available fan 27 can be placed in the housing 25 upstream of the heating module. The effective for the air flow 8 surface of the fan 27 corresponds substantially to the heat dissipation region 7 of the electric heating module, while the core 3, 4 of the heating module is covered in projection from the fan motor. The electrical connection for the heating module can be led out of the housing 25 together with the electrical connection of the fan motor.

Finally, FIG. 3 shows a perspective view of the electric heating module from FIG. 1, which is installed in a housing 25, but has not yet been combined with a fan. In this representation, it can be clearly seen that the first heat-emitting block 5 visible here consists of a multiplicity of substantially radially extending lamellae, which, viewed in the direction of flow, are formed towards the center of the module as wide "stems" and extend radially outward taper, but branch radially outward, to increase the number of fins swept by the airflow in the radially outer area of the heat release area. Between the individual "trunks" of the radially outwardly branching lamellae, which are configured relatively wide for effective heat conduction, narrow and shorter lamellae are arranged in order to keep the total area that gives off heat to the air flow as large as possible , the lamellae are integrally connected with each other, since the heat release block 5 as a whole has been manufactured as an extruded profile Finally, Figure 3 illustrates the easy accessibility of the electrical connections for the PTC Eiement 1, the power supply via a two-core cable 28, the two wires are connected to the cable lugs 21, 24. The further power line within the heating module is described in more detail with reference to FIG.

The design of the heat-emitting block 5 shown in FIG. 3 ensures uniform structuring of the heat-dissipating area 7 and offers a large surface area for exchanging heat with the air flow 8 and low airflow losses. The heat-dissipating blocks 5, 6 are in this case pressed circumferentially around the radii with the core parts 3, 4, resulting in an advantageously high thermal conductivity from the core parts 3, 4 into the heat-dissipating blocks 5, 6.

FIG. 4 shows, in a schematic top view in the flow direction, a first exemplary embodiment of a profile according to the invention, in this case an extruded profile, this first exemplary embodiment already being used in the electric heating module illustrated in FIGS. The extruded profile consists of an internal heat distribution ring 30 contacting the core 3, 4 with PTC elements, from which a plurality of lamellae in the form of stems 31 extend radially outwards, which stems 31 extend approximately halfway along their extent each branch three branches 32. In order to ensure better adaptation to a stream of air coming from a round fan, the blades are not exactly radially aligned. but take a curved course. Between the individual logs 31 of the blades, short intermediate blades 33 are arranged to utilize the spaces between the logs 31. The described parts of the dargesteiften extruded profile are naturally integrally formed integrally formed.

FIG. 5 shows an exemplary embodiment of a second variant of an extruded profile designed according to the invention, again a schematic top view in the direction of flow. This extruded profile in turn consists radially inwardly of a heat distribution ring 30, from which a plurality of lamellae extend radially away, each forming a stem 31. At these stems 31, which do not branch here, in each case a plurality of branches 34 are arranged, which extend approximately perpendicular to the main extension direction of the stems 31 and thus penetrate the projection surface of the heat dissipation region 7 regularly.

FIG. 6 shows a third variant of a profile according to the invention, again an extruded profile, again in a representation as in FIGS. 4 and 5. The variant shown here again has a heat distribution ring 30, but this is not disposed radially inward and for contacting the core part 3 4, but of the PTC element 1, but here the heat distribution ring is radially spaced from the core parts 3, 4 and provided with a plurality of inner fins 35 extending radially inward from the heat distribution ring 30 to the core parts 3, 4 or any other source of heat. In addition, the heat distribution ring 30 is also provided radially outwardly with outwardly extending outer fins 36, the number of which is about twice as large as the number of inner fins 35th

Finally, FIG. 7, again in a schematic plan view in the flow direction, shows a variant of a design according to the invention

Extruded profile, which consists of two modules 37, 38. Each of these two modules 37, 38 has a radially distributed inside heat distribution ring 30 and a plurality of radially outwardly extending blades 35, 36th

The peculiarity consists in the fact that the first module 37 serves for contacting core parts 3, 4 with a PTC element. The second module 38 can simply be placed on the first module 37 in order to enlarge the heat dissipation area 7 and thus adapt to a larger fan, for example. The heat transfer between the first module 37 and the second module 38 is ensured via the heat distribution ring 30 of the second module 38.

PTC element

sealing ring

Core part (first)

Core part (second)

Heat output block (first)

Heat output block (second)

Heat-dissipating area

airflow

Contact area (from 1, first). Contact surface (from 1, second), fastener

, cylinder head screw

, Inner square (from 12). Shank (of 12)

, Hex nut

, toothed washer

, spring washer

, insulating sleeve

, Perforated disc part (from 18). Cable eyelet (first)

, Cable lug (first)

, washer

, Cable eyelet (second). Cable lug (second)

, casing

, locking elements

, Fan

, Kabei

, mounting flanges

, Heat distribution ring

, tribe

, branches 33. intermediate lamellae

34th branches

35. inner lameils

36. outer lameils

37th module (first)

38th module (second)

Claims

claims

1 . Electric heating module for air flow heating, comprising

at least one planar PTC element (1) having a first (9) and a second contact surface (10),

- A heat-permeable heat dissipation region (7), in which heat-conducting fins (5, 6) are arranged, which are in thermally conductive connection with the PTC element (1), as well as

a heat and current conducting core (3, 4) which carries the lamellae (5, 6) and which is divisible into a first (3) and a second core part (4),

- wherein the PTC element (1) between the first (3) and the second core part (4) is arranged and with its first contact surface (9) on the first core part (3) and with its second contact surface (10) on the second core part ( 4) is present,

characterized,

- That a fastening element (1 1) is present, which passes through the first core part (3), the PTC element (1) and the second core part (4) and fixed to each other.

2. Electric heating module according to claim 1,

characterized,

that the fastening element (1 1) is electrically conductive and serves as a power supply to either the first (3) or the second core part (4).

3. Electric heating module according to one of claims 1 or 2,

characterized,

in that the fastening element (11) is provided with a spring element which elastically biases the first core part (3), the PTC element (1) and the second core part (4) against one another.

4. Electric heating module according to claims 2 and 3,

characterized,

the fastening element (11) is seated in an electrically insulating sleeve (18) which extends at least over one of the two core parts (3, 4) and the PTC element (1).

5. Electric heating module according to claim 4,

characterized,

in that the door (18) projects outside the bores into a disc (19) which is arranged between two electrical contact elements (20, 23) and electrically separates them from one another, a first of the two electrical contact elements (20) being arranged between the disc (19 ) and the first core part (3) and a second of the two electrical contact elements (23) between the disc (19) and a projecting part (15) of the fastening element (1 1) sits.

6. Electrical heating module according to at least one of claims 1 to 5, characterized

the heat-conducting lamellae (5, 6) are produced in one piece or in several pieces as extruded, cast or extruded profiles.

7. Electric heating module! according to claim 6,

characterized,

in that an extrusion, casting or extrusion profile covers the heat release area (7) as an integral heat output block (5, 6).

8. Electric heating module according to one of claims 6 or 7,

characterized,

in that a first profile (5) is placed on the first core part (3) and a second profile (6) on the second core part (4).

9. Electric heating module! according to at least one of claims 6 to 8, characterized

in that at least a subset of the heat-conducting lamellae (5, 6) is shaped in such a way that the lamellae (5, 6) form a trunk (31) starting from the core (3, 4) and this trunk becomes more distant from the core (3, 4) branches at least once into two or more branches (32).

10. Electrical heating module according to at least one of claims 6 to 9, characterized

the heat-conducting lamellae (5, 6) have flow cross-sections which decrease with increasing distance from the core (3, 4).

1 1. Electric heating module according to at least one of claims 1 to 10, characterized

the heat-conducting lamellae (5, 6) have a substantially black, in particular black anodised surface.

12. extruded, cast or extrusion profile with heat-conducting lamellae (5, 6) extending radially from a core (3, 4) extending radially outwards, in particular for use in a heat dissipation region (7) of an electric Heizmoduis after at least one of Claims 1 to 1 1,

characterized,

13. Extrusion, casting or extrusion profile with heat-conducting lamellae (5, 6) extending radially from a core (3, 4) extending radially outwards, in particular for use in a heat dissipation region (7) of an electric heating module according to at least one of Claims 1 to 1 1,

characterized,

in that at least a subset of the heat-conducting lamellae (5, 6) are shaped in such a way that the lamellas (5, 6) form a stem (31) extending substantially radially away from the core (3, 4), to which a plurality of lugs (5, 6) extend Is formed substantially perpendicular to the main extension direction of the trunk from this resulting branches (34).

14. Extruded, cast or extrusion profile with heat-conducting lamellae (5, 6), which extend radially outward from a core (3, 4), in particular for use in a heat-dissipating area (7) of a heating module according to at least one of the claims 1 to 1 1, characterized

in that it has a heat distribution ring (30) which is radially spaced around the core (3, 4) and which is provided with heat conducting fins (5, 6) extending radially inwardly to the core (3, 4).

15. extruded, cast or extrusion profile according to claim 14,

characterized,

in that the heat distribution ring (30) is also provided with radially outwardly extending heat-conducting lamellae (5, 6).

16 extruded, cast or extrusion profile with thermally conductive fins (5, 6) extending from a core (3, 4) extending radially outward, in particular for use in a heat dissipation region (7) of an electric heating module according to at least one of Claims 1 to 11, characterized,

in that it can be assembled from at least two modules (37, 38), where a first module (37) surrounds the core (3, 4) and is connected to it in a heat-conducting manner, and a second module (38) can be attached to the first module is that it surrounds this and is thermally connected to it.

Extrusion, casting or extrusion profile according to one of claims 12 to 16,

characterized,