EP4084577A2 - Electric heating device and method for its production - Google Patents

Abstract

The present invention relates to an electrical heating device (2) with a housing (100) which forms a receiving pocket (102) in which at least one PTC heating device (2) with at least one PTC element (4 ) and for energizing the PTC element (4) with different polarity with this electrically conductively connected conductor tracks (6) is added. The present invention aims to provide an electrical heating device of the type mentioned at the outset, which can compensate for manufacturing tolerances in an improved manner without significantly impairing the heat discharge from the PTC element and can be produced economically, and for this purpose proposes on opposite main side surfaces of the PTC element (4) to connect at least one profile part (26) to the PTC element (4) in a thermally conductive manner, with the outer main side surfaces of the profile parts (26) opposite the PTC element (4) being thermally conductively connected to an inner surface (136) of the receiving pocket (102). and wherein the profile parts (26) are connected to the positioning frame (10).

Description

The present invention relates to an electrical heating device with a housing that forms a receiving pocket in which at least one PTC heating device is received. The PTC heating device has a positioning frame in which at least one PTC element is accommodated. Furthermore, conductor tracks electrically connected to the PTC element are provided, as is a heater housing.

In the prior art mentioned above, the positioning frame is used to hold the PTC element and to arrange the conductor tracks. EP 2 637 474 A1 or. EP 2 337 425 A1 each disclose PTC elements that are placed in a corresponding receiving pocket. The electrical heating devices provided for this purpose have a housing with a partition wall which separates a connection chamber from a heating chamber for dissipating heat and from which at least one heating rib protrudes in the direction of the heating chamber, which forms the receiving pocket in which the PTC heating device is accommodated.

Such a configuration can also be used in the present invention. The generic term depicting EP 2 637 474 A1 discloses a PTC heating device that joins a wedge element in a structural unit, which is provided on a main side surface of the at least one PTC element. After the PTC heating device has been introduced into the receiving pocket, the wedge element is displaced in order to connect the PTC element to the inner surfaces of the receiving pocket with good thermal conductivity.

In the previously known solutions described above, the receiving pocket tapers towards its lower, closed end. Accordingly, the insertion opening that opens to the port chamber is wider than the lower closed end of the receiving pocket. The PTC elements and the contact plates lying on both sides are usually braced in the receiving pocket with a wedge-shaped pressure element with at least one insulating layer interposed between the conductor tracks and the inner surface of the receiving pocket lying opposite one another. This wedge element ensures that the layers of the layered structure are clamped against one another. These layers are at least the PTC element(s) and the strip conductors, usually contact plates, extending at right angles to the direction of force action of the wedge element, as well as at least one insulating layer.

Despite the production-related cross-sectional shape of the receiving pocket, which tapers conically downwards, the wedge element should enable good heat transfer, preferably between the two opposite heat extraction surfaces of the PTC element and the inner surfaces of the receiving pocket assigned to them, with the wedge element being placed in between. The pressure built up there also causes the opposite Thermal decoupling surface of the PTC element applied directly or with the interposition of an insulating layer against the opposite inner surface of the receiving pocket.

This ensures good heat extraction. However, there is the problem that the receiving pocket does not always correspond to the designed shape due to manufacturing tolerances.

The PTC elements are also subject to certain dimensional fluctuations due to the production process. It is also not always guaranteed that the heat decoupling surfaces of the PTC element are completely straight and flat.

Pressing in a wedge as a pressure element can lead to voltage peaks, which can break the PTC element or a ceramic insulating layer within the receiving pocket. Depending on the tolerances, the wedge element used as a pressure element in the prior art may not be thick enough in the specific application, so that it basically sits ineffectively on the lower end of the receiving pocket. If, on the other hand, the free space remaining before the insertion of the wedge element is too small, then the height of the receiving pocket, i. H. between the lower end and the insertion opening there is insufficient coverage of the heat decoupling surface of the PTC element. As a result, the PTC element heats up too much and prevents further absorption of power current. Consequently, the efficiency of the PTC element is poor.

The present invention intends to specify an electrical heating device of the type mentioned at the outset, which can compensate for manufacturing tolerances in an improved manner without significantly impairing the heat discharge from the PTC element and which can be produced economically.

In order to solve this problem, the present invention proposes an electric heating device with the features of claim 1.

The electrical heating device is preferably an electrical heating device for a motor vehicle. The housing is usually a housing designed to be suitable for heating a liquid medium, which has inlet and outlet connections for this purpose, but otherwise seals the heating chamber. A partition preferably separates a connection chamber from a heating chamber in a fluid-tight manner. The partition wall is penetrated by an upper end of the PTC heating device. A plurality of PTC heating devices are usually provided, which protrude into the heating chamber as heating ribs. The end of the PTC heating device protruding into the connection chamber usually comprises contact tongues, which are electrically contacted in the connection chamber, for which purpose a contacting device is preferably provided, which combines the different PTC heating devices by grouping the contact tongues into heating circuits and is provided with contact tongues, which the orientation of the contact tongues of the PTC heating devices protrude into an assembled printed circuit board. This assembled printed circuit board controls the power current for heating the PTC heating device and usually forms a control device; see. EP 2 440 004 A1 or. EP 1 872 986 A1 .

However, the housing can also be formed by an extruded profile which forms a receiving pocket open on both sides, the inner surface of the receiving pocket being formed by a partition wall which forms a heating chamber which extends parallel to the receiving pocket and which guides the fluid to be heated. Several profiles can be arranged next to one another in this way, so that a parallel flow for the fluid to be heated is guided past different receiving pockets, as is shown, for example, in FIG EP 0 899 985 A1 is basically known. The receiving pocket can be formed between two joined profiles. However, the receiving pocket can also be formed within a uniform extruded profile.

According to the present invention, a profile part is provided in the receiving pocket and between the PTC heating device on an inside of the receiving pocket. This profile part serves to compensate for stress peaks when the PTC element is thermally conductively clamped in the receiving pocket, for which purpose configurations of the profile parts that are explained in more detail below are to be preferred.

In any case, according to the present invention, the profile parts are connected to the positioning frame. In this case, the positioning frame adds at least the PTC element, which is accommodated in a manner known per se in a receptacle formed by the positioning frame. The positioning frame also positions conductor tracks, usually in the form of contact plates, which protrude beyond the positioning frame to form contact tongues. The conductor tracks can be connected to the positioning frame with a material or form fit. As a rule, the profile parts are directly mechanically coupled to the positioning frame and/or permanently connected thereto so that they cannot be lost and/or cannot be displaced.

Insulating layers, preferably in the form of ceramic plates, are usually provided on the outside of the conductor tracks, so that a heating cell comprising the PTC element and the two contact surfaces is accommodated in an electrically insulating manner between the two insulating layers. The profile parts are usually located on the outside of the insulating layers. According to the invention, these are connected to the positioning frame. By connecting the profile parts to the positioning frame, the insulating layers are usually also positioned. One of the insulating layers can be held in a non-positive manner, for example clamped, between the profile part and the associated conductor track. Alternatively, fastening segments of the positioning frame that interact with the profile parts can also hold the conductor tracks and/or the insulating layers in position. By connecting the profile parts with the position frame is a than Structural unit to handle PTC heating device created, which can be introduced as such in the receiving pocket after pre-assembly.

The profile parts can be clipped to the positioning frame. For this purpose, the positioning frame usually has a latch that engages behind the respective profile part. More preferably, the positioning frame has an upper transverse beam projecting beyond the contact tongues on one side and a lower transverse beam provided opposite thereto. According to this preferred development, form-fitting segments protrude from the transverse bars and overlap the associated profile parts. In this case, at least the form-fitting segments assigned to a transverse bar are usually designed as latches, so that the profile parts can be connected to the positioning frame and thus in a simple manner by clipping.

It goes without saying that the positioning frame is usually made of an electrically non-conductive material, for example plastic, and is preferably injection molded. The profile parts are usually designed as extruded profiles and made of metal, preferably made of aluminum. Each of the profile parts is preferably connected in the receiving pocket via a tongue and groove connection. The tongue and groove connection extends in the insertion direction of the receiving pocket.

This means that in a cross-sectional view transverse to the insertion direction, at least one groove protrudes from the inside of the receiving pocket or a tongue is provided on this inside, in which a tongue protruding from the profile part engages. In the former case, the profile part has a groove in which the spring associated with the heating rib engages. The groove or tongue extends in the direction of insertion. When the profile part is introduced, usually together with the PTC heating device, the groove is pressed into the associated tongue. Tongue and groove slide past each other in the insertion and longitudinal direction. The groove and/or the tongue can have elastic properties. This results in a certain tolerance compensation. The heat is extracted from the PTC element to the exposed outer surface of the heating fin in the heating chamber via the tongue and groove connection.

It is therefore preferable to provide a large number of tongue and groove connections at least between one of the main side surfaces of the PTC element and the opposite inner surface of the receiving pocket. In this case, the largest extension of the PTC element is viewed as the main side surface of the PTC element in a cross-sectional view perpendicular to the direction of insertion. The PTC element is usually cuboid. The main side spans the width of the PTC element. In said cross-sectional view, the thickness of the PTC element runs at right angles to the width. The direction of longitudinal extent of the PTC element or the PTC heating device runs at right angles to the plane spanned by the width and the thickness and basically in the direction of insertion. This direction of longitudinal extension corresponds to the direction of introduction of the PTC heating device into the receiving pocket.

As previously mentioned, the tongue and groove connection is able to compensate for certain manufacturing tolerances through deformation in the area of the tongue and groove connection. The usual large number of tongue and groove connections between the main side surfaces of the PTC element and the opposite inner surface of the receiving pocket maintains good heat extraction from the PTC element.

The solution according to the invention thus allows manufacturing tolerances to be compensated for without impairing the heat extraction from the PTC element.

According to a preferred development of the present invention, a groove-limiting projection delimiting the groove and/or a spring projection at least partially forming the tongue can be pivoted about an axis extending essentially in the insertion direction. This pivotability is brought about by at least one free-standing groove-limiting projection or one free-standing tongue projection. The corresponding projection can be connected to the receiving pocket or the profile part via a relatively thin web. The pivot axis and the pivotability of the projection can be set in a defined manner by the orientation and shape of the web. The ability to pivot is generally at least elastic, possibly also plastic.

According to a preferred development of the present invention, the profile part has a U-shaped receptacle for the PTC heating device. This receptacle usually accommodates the PTC element, the conductor tracks and any insulating layers that may be provided, which in particular directly or indirectly cover the main side surfaces of the PTC element.

The profile part can be an extruded profile part. It is preferably made of aluminum. This makes it necessary to provide at least one insulating layer between the PTC element and an inner surface of the profile part, against which the PTC heating device bears in a thermally conductive manner.

With regard to the most symmetrical possible heat extraction and uniform tolerance compensation, a preferred aspect of the present invention proposes providing tongue and groove connections between each main side of the PTC element and the opposite inside of the receiving pocket. Accordingly, the corresponding tongue and groove connections are preferably formed adjacent to the two main side surfaces of the PTC element.

With regard to good heat transfer between the profile part and the inside of the receiving pocket, according to a preferred development of the present invention, it is proposed that at least one groove-limiting projection that delimits the groove and/or at least one spring projection that at least partially forms the tongue is designed to taper in a wedge shape towards its free end is. The spring projection and the surface of the groove delimitation projection interacting therewith are shaped in such a way that a flat plant between the two results. Due to the wedge shape, the elastic pivoting movement of one of the projections is promoted during joining. The present invention is also based on the assumption that the receiving pocket preferably tapers in a wedge shape towards its lower closed end. Correspondingly, the tongue and groove connection can also be wedge-shaped in the direction of insertion, so that there is approximately the same overlap in the area of the tongue and groove connection in each cross-sectional plane transverse to the direction of insertion of the PTC heating device into the receiving pocket.

Preferably, at least one groove-limiting projection that delimits the groove and/or at least one spring projection that at least partially forms the tongue is integrally formed on the receiving pocket. This specification preferably also applies to the profile part, which is preferably formed as an extruded profile and can have a film hinge on the underside, so that opposite legs of the profile part are connected to one another opposite the connection chamber. This reduces the number of parts to be handled.

According to a preferred development of the present invention, at least one compression element is provided between the profile part and a main side surface of the PTC element. In the case of a U-shaped profile part, the compression element is provided within the profile part. A compression element is preferably provided between the two main side surfaces of the PTC element and the inner surfaces of the profile part. The compression part may be formed by a spring formed of a metal. The tongue usually extends over the full surface of the main side surface in a cross-sectional view transversely to the direction of insertion. It is preferably provided between an inner surface of the profile part and an insulating layer that covers the PTC heating device on the outside.

According to a preferred development, a hardening adhesive is placed in the receiving pocket. This is at least partially included in the tongue and groove connection and hardened there. In this way, the PTC heating device and the profile part are secured in the receiving pocket by the adhesive. The adhesive can be a plastic adhesive with good thermal conductivity. It can, for example, be a silicone adhesive to which particles with good thermal conductivity, for example aluminum oxide particles, have been mixed. The adhesive also improves heat dissipation from the PTC element. It goes without saying that the entire receiving pocket can be filled with adhesive. The adhesive is preferably an electrically insulating adhesive.

With its secondary aspect, the present invention proposes a method for producing a PTC heating device of the type mentioned at the outset. With this method, the insulating layers applied to the outside against the conductor tracks are temporarily held over the positioning frame. Accordingly, the positioning frame forms an assembly aid for pre-positioning the insulating layers. These insulating layers are usually dimensionally stable per se and usually contain at least one ceramic layer, which has further layers on one or both sides, for example may have in the form of a plastic film. Profile parts are placed against the outside of the insulating layers, so that at least one of the insulating layers is located between a respective profile part and the conductor track usually covered by the insulating layer. The profile part is joined to the positioning frame in the manner described above in the method according to the invention. In this way, the profile part is held on the positioning frame at the end of the assembly of the profile part. The profile part also holds the insulating layer. With the method according to the invention, a structural unit is created which can be handled as part of the assembly of the electric heating device and includes the positioning frame, which includes at least one PTC element, the conductor tracks electrically conductively connected thereto and the insulating layers as well as the profile parts. At least one insulating layer and one profile part are located on both sides of the PTC element.

In this case, the positioning frame can also be connected to the conductor tracks in a form-fitting manner, in particular if these are designed in the form of contact plates.

• Fig. 1 eine perspektivische Explosionsdarstellung eines Ausführungsbeispiels einer PTC-Heizeinrichtung;
• Fig. 2 eine perspektivische Explosionsdarstellung der PTC-Heizeinrichtung nach Fig. 1 mit einem ausschnittsweise gezeigten Gehäuse einer elektrischen Heizvorrichtung;
• Fig. 3 eine Querschnittsansicht eines Teils der elektrischen Heizvorrichtung;
• Fig. 4 eine Schnittansicht entlang der Linie III-III gemäß der Darstellung in Fig. 3; und
• Fig. 5 eine Schnittansicht gemäß Figur 4 für eine Variante.

Further details of the present invention result from the following description of an exemplary embodiment in conjunction with the drawing. In this show:

• 1 an exploded perspective view of an embodiment of a PTC heating device;
• 2 an exploded perspective view of the PTC heater 1 with a housing of an electric heating device shown in part;
• 3 a cross-sectional view of a part of the electric heater;
• 4 a sectional view along the line III-III as shown in FIG 3 ; and
• figure 5 a sectional view according to FIG figure 4 for a variant.

the figure 1 shows a PTC heating device 2 with a PTC element 4, conductor tracks 6 in the form of metal strips lying on the main side surfaces of which are covered on the outer surface opposite the PTC element 4 by insulating layers 8, which in this case consist of ceramic plates. Reference number 10 designates an injection-molded positioning frame made of plastic, which between two crossbars, of which the upper crossbar is marked with reference number 12 and the lower crossbar with reference number 14, and two longitudinal bars 16 extending at right angles to the crossbars 12, 14, a receptacle 18 for the PTC element 4 forms. The contact plates forming the conductor tracks 6 have contact tongues 20 formed in one piece by stamping on them, which are provided at opposite ends of the positioning frame 10 in the direction of longitudinal extension of the upper transverse bar 12 and are accommodated in through-openings of the upper transverse bar 12 .

Form-fitting segments 22 with locking pawls 24 project opposite one another from the transverse bars 12 at their outer ends. These special form-fitting segments 22 project beyond the upper transverse bar 12 in the width direction.

The form-fitting segments 22 and the latches 24 are located on the outer edge of the positioning frame 10 in extension of the longitudinal beams 16 and thus outside the main side surface of the PTC element 4. The main side surface of the PTC element 4 is characterized by the respective largest surface of the cuboid PTC Element 4 formed. In the present case, the other surfaces extend between the two main side surfaces as a peripheral edge.

The latches 24 overlap with reference numeral 26 identified profile parts, which are formed by extruded aluminum elements. The profile parts 26 are captively connected to the positioning frame 10 by the form-fitting segments 22 , 24 . As usual, the latches 24 have a front ramp surface, which widens the latches 24 when the profile parts 26 are pressed open and springs back against the outer surface of the insulating layers 8 after the profile parts 26 have been applied in order to engage behind the profile parts 26 . As a result, the profile parts 26 are connected to the positioning frame 10 . The insulating layers 8 are dimensioned in such a way that they also fit between the form-fitting segments 22 and are optionally also latched in the manner described above, but are in any case clamped between the profile parts 26 that are held in a form-fitting manner.

Accordingly, during assembly, a contact sheet forming the conductor track 6 is usually connected to the positioning frame 12 on one side of the positioning frame 12 , in this case by inserting the contact sheet with its contact tongue into the feed-through opening of the upper transverse beam 12 . The form-fitting segments 22 then enclose the conductor track 6. The receptacle 18 is then closed on one side. The PTC element 4 is then inserted into this receptacle.

Then, for example, the associated insulating layer 8 is placed against the corresponding conductor track 6 on the side provided with the conductor track 6 . The insulating layer is arranged between the latches 24 and the form-fitting segments 22, which ensure pre-positioning and holding of the insulating layer 8, which is formed by a ceramic plate according to the exemplary embodiment. The profile part 26 is then placed against the positioning frame 10 from the same side and connected to the positioning frame 10 via the form-fitting segments 22 , 24 .

The other conductor track 6, the insulating layer 8 associated with this conductor track 6 and finally the profile part 26 provided there may then be mounted on the opposite side in the manner described above. Here, too, the positioning frame 12 holds the insulating layer 8 or the conductor track 6 in a position that is favorable for assembly before the profile part 26 is finally locked on the positioning frame.

The PTC heater 2 prepared in this way is in 2 visible in the assembled state. In this exemplary embodiment, only the form-fitting segments 22 associated with the upper transverse bar 12 are shown as latches. The form-fitting segments 22 provided on the lower transverse beam 14 only overlap the profile parts 26.

In 2 On the right next to the PTC heating device 2, a housing 100 of an electrical heating device identified by the reference numeral 98 in the figures below can be seen. The housing 100 forms accommodation pockets 102 . A single PTC heating device 2 fits in each of the receiving pockets 102. The receiving pockets 102 are designed in the manner of a hammer head at the end and thus leave room for the introduction of the form-fitting segments 22, 24. In between, a structure of the receiving pocket 102, explained in more detail below, acts with one on the outer surface of the profile parts 26 together, in order on the one hand to arrange the PTC heating device with a certain prestress and thus with good thermal conductivity in the receiving pocket 102, but on the other hand to prevent excessive stress on the elements of the PTC heating device 2 provided between the profile parts 26. The insulating layers 8 and the PTC element 4 are ceramic components and are therefore only able to a limited extent to compensate for local stresses or bending stresses through elastic deformation.

the figure 3 shows the essential components of the electrical heating device 98 with a housing 100 made of a material with good thermal conductivity, in this case die-cast aluminum. The housing 100 forms a wall 105 surrounding the circumference of a heating chamber 104 . In 2 the heating chamber 104 is still open on the underside, since a bottom closing the housing 100 on the underside in 3 is not shown. The same applies to a control housing cover, which is connected to the housing 100 on the opposite side in order to cover and surround a connection chamber identified by reference number 106 . The housing 100 forms a partition wall 108 in one piece between the heating chamber 104 and the connection chamber 106 . Heating ribs 110 protrude from this partition wall 108 into the heating chamber 102 . The heating ribs 110 are closed at their lower end protruding into the heating chamber 102 . Like the hatching in 3 As illustrated, the heater fins 110 are formed from a one-piece die-cast aluminum housing 100 along with the bulkhead 108 and wall 105 .

The heating ribs 110 form a receiving pocket 102 tapering downwards in a wedge shape. The PTC heating device identified by reference number 2 is accommodated in this accommodation pocket 102 . As the sectional view according to 4 clarified, the PTC heating device 114 comprises a PTC element 116, on the main side faces of which are conductor tracks 118, which in the present case have a wire mesh made of an electrically conductive material. On the the PTC element 116 opposite side of the conductor track 118 is an insulating layer 120, which can be formed by a ceramic layer and / or an insulating plastic film. The gap between the insulating layer 120 and the PTC element 116 is completely filled by the conductor track 118 . For this purpose, the free spaces between the wire mesh are filled with an adhesive with good thermal conductivity, which is also provided in the plane of the conductor track 118 and is to be understood as belonging to the conductor track 118 . The wire mesh protrudes beyond the PTC element to form contact tongues 122, which are 3 are shown. Otherwise, the individual layers of the layered structure between the PTC element 116 and the profile part 126 have been shown in Fig figure 3 combined in the form of a layer shown in section between the respective profile part 126 and the PTC element 116 .

The contact tongues 122 are exposed in the connection chamber 106 . The PTC element 116 and the insulating layer 120 are joined to form a unit by promoting adhesion of the conductor track 118 . On the outside of this PTC heating device 114 are 4 recognizable compression elements 124 in the form of corrugated spring sheets.

the figure 4 shows details of the respective profile parts 126, which are identical in the present case. The compression elements 124 rest against the inner sides of these profile parts 126 in each case.

Groove delimiting projections 132 protrude from the outer sides of the profile parts 126 and in pairs enclose a groove 134 between them. How in particular 4 As illustrated, a large number of identically designed grooves 134 are cut out in this form on the outside of the main side surfaces of the profile parts 126 . The grooves 134 extend in the insertion direction of the receiving pocket 102, which 3 marked with E.

An inner surface 136 of the receiving pocket 102 has projecting spring projections 138 . These spring projections 138 are integrally formed on the die-cast housing 100 . As the cross-sectional view according to 4 mediated, the spring projections 138 run towards their free end in a wedge shape. Correspondingly, the groove-limiting projections 132 are also designed to taper in a wedge shape towards their free front end. It goes without saying that only the surfaces of the groove-delimiting projections 132 that respectively delimit the groove 134 have such a configuration. To clarify this situation, 4 on the right side the spring projections 138 are omitted.

At the in 4 In the exemplary embodiment shown, the positioning frame 128 is first fitted with the PTC element 116, the conductor tracks 118 and the insulating layers 120 as well as the compression elements 124 and the profile parts 126 as part of the assembly. The PTC heating device 114 preassembled in this way is then inserted into the receiving pocket 102 . The spring projections 138 engage in the grooves 134 assigned to them. There is one from the Compare the right side to the left side 4 Deformation to be recognized in the area of the groove-delimiting projections 132. This results in a certain tolerance compensation. In addition, the compression element 124 is deformed to compensate for tolerances. Ideally, after assembly has taken place, the compression element 124 rests essentially over its entire surface against the inner surface of the profile part 26 on the one hand and against the outside of the insulating layer 120 on the other hand.

The compression element 124 can consist of aluminum, copper, copper beryllium or another material with good thermal conductivity that permanently applies elastic prestressing forces.

Remaining cavities in the receiving pocket 102 can be filled with a good thermally conductive mass, for example a hardening plastic mass filled with thermally conductive particles.

At the in figure 5 The variant shown, the groove delimiting projections 132 are connected to the rest of the profile part 26 via a relatively thin web 140 . This web 140 creates a pivot axis which extends essentially in the insertion direction E. In this embodiment, compression elements can be dispensed with. Neighboring groove-limiting projections 132 for different grooves 134 are spaced sufficiently far apart from one another, so that when the wedge-shaped spring projections 138 are introduced, they can each pivot about their pivot axis without colliding with one another. This enables a considerable tolerance compensation. The layers of the PTC heating device 2 within the profile parts 126 are placed against the inner surface of the two profile parts 126 with good elastic tension, as a result of which the heat extraction is improved.

figure 5 also illustrates the bulging of the inner surface of the profile parts 126 in such a way that, in a cross-sectional view, this rests essentially at points, linearly in the longitudinal direction on the insulating layer 120. This deformation of the respective profile part 126 causes an additional elastic bracing of the layers of the PTC heating device 114 in the receiving pocket 102 as well.

Reference List

2

PTC heating device

4

PTC element

6

trace

8th

insulating layer

10

frame

12

upper cross bar

14

lower crossbar

16

longitudinal beam

18

recording

20

contact tongue

22

interlocking segment

24

latch

26

profile part

98

electric heater

100

Housing

102

receiving bag

104

heating chamber

105

Wall

106

connection chamber

108

partition wall

110

heating fin

114

PTC heating device

116

PTC element

118

trace

120

insulating layer

122

contact tongue

124

compression element

126

profile part

128

frame

128

film hinge

132

groove limiting projection

134

groove

136

Inner surface

138

spring protrusion

140

web

E

insertion direction

Claims (10)

Electrical heating device (2) with a housing (100), which forms a receiving pocket (102), in which at least one PTC heating device (2) with at least one PTC element (4) received in a positioning frame (10) and for energizing the PTC element (4) with different polarity with this electrically conductively connected strip conductors (6), characterized in that on opposite main side surfaces of the PTC element (4) at least one profile part (26) is thermally conductive with the PTC element (4 ) that the outer main side surfaces of the profile parts (26) opposite the PTC element (4) are each thermally conductively connected to an inner surface (136) of the receiving pocket (102) and that the profile parts (26) are connected to the positioning frame (10). . Electrical heating device according to Claim 1, characterized in that the profile parts (26) are clipped to the positioning frame (10). Electrical heating device according to Claim 1 or 2, characterized in that the positioning frame (20) has an upper transverse bar (12) projecting beyond the contact tongues (20) on one side and a lower transverse bar (14) provided opposite thereto and that the transverse bars (12, 14) in each case form-fitting segments (22) depart, which engage over the associated profile parts (26). Electrical heating device according to Claim 3, characterized in that at least one of the transverse bars (12) has a positive-locking segment (22) designed in the manner of a latch (24). Electrical heating device according to one of the preceding claims, characterized in that the profile parts (26) are each formed by extruded profiles made of metal, in particular aluminum. Electrical heating device according to one of the preceding claims, characterized in that an electrical insulating layer (8) is provided between the profile parts (26) and the conductor tracks (6). Electrical heating device according to one of the preceding claims, characterized in that the profile parts (26) are connected to the receiving pocket (102) via a tongue and groove connection (134, 138) which extends in the insertion direction of the receiving pocket (102). Electric heating device according to one of the preceding claims, characterized in that at least one groove-delimiting projection (132) delimiting the groove and/or at least one spring projection (138) at least partially forming the spring can be pivoted about an axis extending in the insertion direction (E). Electrical heating device according to one of the preceding claims, characterized in that the housing (100) has a partition (108) which separates a connection chamber (126) from a heating chamber (102) for dissipating heat and from which at least one heating rib towards the heating chamber (102) protrudes, which forms the receiving pocket (102). Method for producing a PTC heating device (2) for an electrical heating device (2) with a housing (100) which forms a receiving pocket (102) in which the PTC heating device (2) is fitted with at least one positioning frame (10) accommodated PTC element (4) and for energizing the PTC element (4) with different polarity with this electrically conductively connected strip conductors (6), which are each covered on the outside with at least one insulating layer (8), characterized in that the On the outside against the conductor tracks (6) isolating layers (8) held over the positioning frame (10) and after application of profile parts (26) against the isolating layers (8) on an outside of the PTC element (4) facing away from the respective isolating layer (8) are held between the insulating layer (8) and the profile part (26) by connecting the profile part (26) to the positioning frame (10), and that the positioning frame (10) holds the at least one PTC element (4) , The conductor tracks (6), the insulating layers (8) and the profile parts (26) is formed comprehensive structural unit.

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