Electric heating device

Abstract

The invention relates to an electric heating device (2), comprising an electric heating device (22), a heating chamber (6) which is connected to the electric heating device in a heat-conducting manner, a heating element (7) for heating an insulating layer (18; 32; 102) under the intermediate layer; and a control device (36), the control device (36) having at least one power switch (100) generating loss power, the power switch being connected to the medium in order to derive the loss power through the heat conduction path (WL). In order to create an electric heating device which can be produced with reduced mounting effort, it is proposed that the insulating layer (102) is also arranged in the heat conduction path (WL).

Description

Technical Field

[0001] The present invention relates to an electric heating device, which comprises: an electric heating device; a heating chamber which is heat-conductively connected to the electric heating device with an insulating layer interposed therebetween to heat a medium; and a control device, wherein the control device comprises at least one power switch which generates power loss, and the power switch is connected to the medium via a heat conduction path to conduct away the power loss. Background Art

[0002] Such an electric heating device is known, for example, from EP 2884197 A1 or EP 3101364 A1 or EP 3334243 A1. Summary of the invention

[0003] Based on this, the object of the present invention is to specify an electric heating device of the mentioned type which can be produced with reduced assembly effort.

[0004] In order to solve this problem, the present invention proposes to further provide an insulating layer in the heat conduction path.

[0005] The electric heating device has an insulating layer which is arranged as a homogeneous, flat starting product, usually in the form of a film or comprises such a film, between the electric heating device and the heating chamber and also in the heat conduction path between the circuit breaker and the medium to be heated.

[0006] The insulating layer formed from a flexible synthetic material film allows such an arrangement of the insulating layer and thus enables the electrical insulation formed thereby to be achieved in different planes.The flexible insulating layer can be folded or bent.

[0007] It is also possible to form the insulating layer using three-dimensional molded parts made of insulating material, such as synthetic material and / or ceramic, which are located on different planes within the electrical heating device.

[0008] The electric heating device usually has a layered structure consisting of different layers. One of the layers is usually formed by the electric heating device. Another layer is formed by the heating chamber or the walls defining the heating chamber and the cavity arranged between them. Of course, the heating chamber usually has a flat extension with a relatively small height, which extends in the direction of the individual layers of the stacked heating mechanism. Another layer can be formed by a control device including or formed by a circuit board. Since the different layers are usually adjacent to each other and / or supported against each other, the electric heating device is designed to be relatively compact. The control device is usually located on the outside of the layer to minimize the thermal stress on it.

[0009] The heating chamber can be arranged between the electric heating device and the circuit board, wherein, according to a relatively simple design, the power switch is arranged on the side of the circuit board facing the heating chamber, and the power switch is arranged between the circuit boards and connected to the surface of the heating chamber facing the control device in a heat-conducting manner. This structure produces a certain distance between the heating chamber and the circuit board that is predetermined by the height of the power switch, so that the circuit board and the components arranged thereon are thermally decoupled to a certain extent from the components of the electric heating device that are heated or to be heated.

[0010] With regard to the compact design, according to a preferred development of the invention, it is proposed that the power switch is arranged in a plane containing the electric heating device. In a layered side view, the power switch is then regularly positioned laterally next to the electric heating device and is connected in a heat-conducting manner to the heating chamber, which in this example is located on the side of the control device facing away from the electric heating device.

[0011] Here, the power switch or the heat conduction path may also be contained in or pass through a plane containing the second heating chamber. Because according to a preferred design of the present invention, the electric heating device has a first heating chamber and a second heating chamber. An electric heating device is accommodated between the two heating chambers. The heat generated by the electric heating device is dissipated from both sides to the medium to be heated and heated there. The transfer of heat from the electric heating device to the first heating chamber and the second heating chamber is achieved through the electrical insulation part, so that the corresponding heating chamber rests on the electric heating device in an electrically insulating manner. The uniform insulating layer of the present invention can be arranged between the first heating chamber and the electric heating device and / or between the second heating chamber and the electric heating device and / or between the power switch and the first or second heating chamber.

[0012] The uniform insulating layer therefore preferably separates all components of the electric heating device having electrical polarity from those medium-conducting parts of the electric heating device which are connected thereto for dissipating heat.

[0013] The electric heating device according to the invention is particularly suitable for operation at high voltage currents, for example electric heating devices for drives of electric vehicles. According to the invention, currents greater than 400 volts, possibly greater than 700 volts, are considered to be high voltage currents. The electric heating device according to the invention is generally designed to heat liquid media or is preferably suitable for operation in motor vehicles.

[0014] The electric heating device preferably has a housing formed by a housing base and a housing cover. Usually, the control device and the electric heating device are accommodated in the housing. The housing base has a usually flat housing bottom that delimits the housing, and the housing bottom usually extends substantially parallel to the housing cover. These components of the housing are usually made of a metal material; this material always has good electromagnetic shielding properties. The volume formed by the housing for accommodating all components of the electric heating device is preferably limited only by the two components of the housing base and the housing cover.

[0015] Preferably, the medium to be heated is at least also guided in a fluid housing, which is contained in the housing and is suitable for passing the medium to be heated through the guide. The fluid housing is usually closed and has only predetermined inlets and outlets, through which the medium is introduced into the fluid housing or discharged. The fluid housing is connected to the electric heating device in a heat-conducting manner. This should be understood in particular as the fluid housing being against the electric heating device in a heat-conducting manner. In order to achieve the most effective heat extraction as much as possible, the fluid housing is usually made of a material with good thermal conductivity, usually a metal, such as aluminum or an aluminum alloy. Regarding the electrical insulation of the fluid housing and the electric heating device, a separate or previously introduced insulating layer can be provided between the fluid housing and the electric heating device, and the insulating layer can be formed, for example, by a synthetic material film, a ceramic plate or a coated plate or a combination of the above, for example, a ceramic plate covered with a synthetic material film or contained therein.

[0016] According to a preferred development of the invention, the electric heating device is thermally coupled to the housing bottom of the housing base, which delimits the first heating chamber. Here, as described above, a separate insulating layer or the previously described insulating layer can also be arranged between the electric heating device and the housing bottom. The electric heating device is then preferably arranged between the fluid housing and the housing bottom, usually as a flat component with an extension parallel to the housing bottom and parallel to the fluid housing, which is preferably also designed flat. In order to improve the heat removal, the electric heating device rests against the housing bottom and the fluid housing under pretension.

[0017] For this purpose, an elastic preload is preferably provided, in particular an elastic preload formed from a compressible material. This material can be located on the side of the fluid housing opposite to the heating direction and can act there in such a way that the fluid housing bears against the electric heating device under preload and the electric heating device bears against the housing bottom under preload. In this variant, the elastic preload is located between the electric heating device and the fluid housing. Alternatively or additionally, the preload can also be arranged between the electric heating device and the housing bottom.

[0018] With regard to good heat output, synthetic material films, in particular silicone films, arranged between the fluid housing and the electric heating device or between the fluid housing and the housing bottom, wherein the fluid housing is screwed to the housing, in particular the housing bottom of the housing base, have also proven to be effective as elastic preload means. The corresponding films usually have a base surface that covers at least the heat-decoupled base surface of the electric heating device. The preload means can be formed by an insulating layer.

[0019] It has been shown that this film can not only store a certain preload and transfer it to the electric heating device, so that its two sides are flatly applied to the fluid housing or the bottom of the housing for heat output. On the contrary, this film can also compensate for certain tolerances that often occur on the side of the PTC element. This PTC element is preferably a part of the electric heating device. Here, the PTC element is usually distributed flatly relative to the bottom of the housing. The bottom of the housing usually only defines the support surface of the PTC element, rather than directly defining its abutment surface. On the contrary, there is usually an electrical insulation layer on the bottom of the housing, which supports the contact connection layer on the side away from the bottom of the housing. The contact connection layer can be formed by a contact sheet. The contact connection layer can also be applied to the electrical insulation layer as a conductive coating. In other words, the contact connection layer and the electrical insulation layer according to the present invention can be formed by a single or one-piece component that provides multiple functions. In any case, the PTC element in question is conductive to the contact connection layer and is energized through the contact connection layer. The PTC element is usually a ceramic cuboid component, which is provided with a metallization on the opposite side (usually on the opposite main side surface) for current introduction.

[0020] As can be seen from the above description, the present invention proposes an electric heating device, which includes a plurality of parallel layers, wherein a fluid housing and a control device mainly at least partially used for the heated medium are accommodated in the housing. To this end, the housing has a housing base, which forms the bottom and thus forms an abutment surface for the electric heating device inside the housing. The housing cover forming the first heating chamber extends in parallel on the opposite side of the housing bottom. The first heating chamber usually extends in parallel and has a geometric configuration similar to that of the second heating chamber formed in the fluid housing. This results in roughly equivalent heat output on both sides of the electric heating device. Therefore, the PTC element that preferably forms the heating element is evenly cooled on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Further details and advantages of the present invention can be obtained from the following description of the embodiments in conjunction with the accompanying drawings.

[0022] Figure 1 Show according to Figures 6 to 9 A perspective exploded view of the basic structure and components of an embodiment of the present invention.

[0023] Figure 2 Show according to Figure 1 A perspective exploded view of a housing base and a heating chamber cover of an embodiment of the present invention.

[0024] Figure 3 Show according to Figure 1 A perspective exploded view of a fluid housing of an embodiment of the invention.

[0025] Figure 4 Show according to Figure 1Embodiment, perspective top view of a housing base partially equipped with components

[0026] Figure 5 The embodiment is shown along Figure 4 A cross-sectional view along line VV shown;

[0027] Figure 6 A top view showing an open state of an embodiment of the present invention.

[0028] Figure 7 Show according to Figure 6 A schematic cross-sectional view of an embodiment of ;

[0029] Figure 8 A schematic diagram showing a first variation of an embodiment of the present invention;

[0030] Fig. 9 A schematic diagram showing a second variation of an embodiment of the present invention;

[0031] Fig.10 A schematic diagram showing a third variation of an embodiment of the present invention;

[0032] Fig.11 A schematic diagram showing a fourth modification of the embodiment of the present invention. DETAILED DESCRIPTION

[0033] Figure 1 An electric heating device 2 is shown having a housing base 4, which is located at Figure 1 The lower side of the heating chamber is connected to the heating chamber cover 8 to form the first heating chamber 6.1, see Figure 2 Reference numeral 10 denotes a fluid housing, which is accommodated in a housing cavity 12 formed by the housing base 4. In this housing cavity 12, which is delimited on the lower side by a bottom 14 and on the edges by a surrounding wall 16 extending from the bottom 14, there is a first insulating layer 18 that can rest against the bottom 14, a first contact connection layer 20 and a heating device 22 with a plurality of heating elements 23, here in the form of PTC elements 24, and a positioning frame 26 with a receptacle 28 for receiving the PTC elements 24 between the bottom 14 and the fluid housing 10.

[0034] On the side of the heating device 22 opposite to the first contact connection layer 20, a second contact connection layer 30 is provided, and on the side opposite to the heating device 22, a second insulating layer 32 is provided. Therefore, the PTC element is conductively pressed against the contact connection layers 20, 30 and is energized via the contact connection layers 20, 30. The PTC element 24 is a ceramic cuboid component, which is provided with a metallization portion on the opposite main side surface for current introduction. The main side surface is a planar extension of the cuboid with the largest area extension. The main side surfaces are connected to each other by edge surfaces, which determine the height of the PTC element and have no metallization portion. The main side surface is usually 5 times larger than one of the edge surfaces, preferably 5 times larger than the sum of all edge surfaces.

[0035] The second insulating layer 32 is formed from a silicone film as a preload device 33 which can withstand a certain compression by elastic deformation and thus the electric heating device 22 between the housing base 10 and the housing bottom 14 rests against the housing base 10 and the housing bottom 14 under preload.

[0036] The layering of the first insulation layer 18 , the first contact-connection layer 20 , the heating device 21 , the second contact-connection layer 30 and the second insulation layer 32 is also referred to below as a layered structure 34 .

[0037] In the exemplary embodiment shown, on the side of the fluid housing 10 facing away from the layered structure 34, a transistor insulator 40 is located between a circuit board 38 forming the control device 36 and the fluid housing 10. Reference numeral 42 denotes a housing cover, which is provided for forming a Figure 5 The housing 4 is connected to the housing base 4 by the housing marked with reference numeral 44. The housing base 4 and the housing cover 42, and optionally other housing parts, are designed to be shielded, that is, they are made of metal and / or a separate shield is provided inside, outside or inside the wall of the corresponding housing part. Aluminum is preferably used as the metal material, or stainless steel is preferably used for corrosion resistance.

[0038] On the lower side of the housing base 4 opposite the housing cover 42, Figure 1 4 shows a power plug 46 and a control plug 48. The two plugs 46, 48 are connected to the housing base 4 in a sealed manner and have various male electrical plug contacts, which pass through the respective housings of the plugs 46, 48 in a sealed manner and make plug contacts in the circuit board 38 and are electrically connected to the conductor tracks of the circuit board 38 via the plug contacts. Figure 4 For the plug contact, the circuit board has 38 female contact tongue sockets, which are described in EP2236330A1.

[0039] An inlet port 50 and an outlet port 52 are also provided on the lower side for connecting a pipe or a hose for conveying the fluid to be heated. Figure 1, which is formed in this case by two sealing rings 54, as will be explained in more detail below. Reference numeral 56 denotes a screw for fixing the fluid housing 10 relative to the housing base 4 below the middle layer of the layered structure 34. By means of the threaded connection, the layers of the layered structure 34 bear against the fluid housing 10 and the bottom 14 of the housing base 4 under preload.

[0040] Figure 2 An exploded view of the housing base 4 and the heating chamber cover 8 shown at a distance therefrom is shown, and the interior of the first heating chamber 6.1 is shown. As shown, the ports 50, 52 are formed by separate components that align with two holes in the heating chamber cover 8 formed by a flat plate, one of which forms the inlet 58 and the other forms the outlet 60. The ports 50, 52 can be welded or glued to the heating chamber cover 8.

[0041] Reference numeral 62 denotes a distributor arranged in a plane HE1 containing the first heating chamber 6.1. The distributor 62 has an inlet distributor segment 64 and an outlet distributor segment 66, which are arranged independently of each other and covered by the heating chamber cover 8. The corresponding distributor segments 64, 66 are arranged symmetrically about the longitudinal axis L of the housing base 4 and are assigned an inlet branch 68 or an outlet branch 70 of the first heating chamber 6.1. In a plan view, the distributor segments 64, 66 each have a base surface that is approximately triangular. Each distributor segment 64, 66 is merged into a corresponding branch 68, 70 via an overflow edge 72. The overflow edge 72 is located in the height direction between the first heating chamber bottom 74 of the first heating chamber 6.1 and the opposite covering surface of the first heating chamber 6.1 formed by the heating chamber cover 8.

[0042] Flow guide ribs 76 project from the first heating chamber bottom 74 to guide the flow, against which the heating chamber cover 8 rests in a fluid-tight manner.

[0043] The inlet 58 and the outlet 60 are each arranged such that they partially cover the first heating chamber 6 . 1 and partially cover the respective distributor segment 64 , 66 . The overflow edge 72 passes approximately through the center of the hole forming the inlet 58 or the outlet 60 .

[0044] Details of the second heating chamber 6.2 are given in Figure 3 The fluid housing 10 is formed by a fluid housing base 78 and a fluid housing cover 80 welded thereto. The second heating chamber 6.2 also has a flow guide rib 76. A plurality of fixing holes 82 are provided on the circumference of the fluid housing 10, through which screws 56 pass, so as to connect the fluid housing 10 to the housing bottom 14 under the middle layer of the electric heating device 22. Figure 4In the embodiment, the thread formed on the housing bottom 14 is denoted by reference numeral 83 .

[0045] exist Figure 4 In the embodiment of the present invention, reference numeral 84 denotes a first inlet channel segment and reference numeral 86 denotes a first outlet channel segment. These channel segments 84, 86 are formed on the housing base 4 and pass through the housing base 4. Figure 3 Second inlet and outlet channel segments 88 , 90 are shown formed as one piece on the fluid housing base 78 .

[0046] In particular Figure 5 As shown, the second channel segments 88 , 90 are designed as tips 92 , which are each engaged in a socket end 94 formed by the first channel segments 84 , 86 , and the sealing structure 53 is arranged between them and abuts against a rest shoulder 96 in the axial and radial directions, and the rest shoulder 96 is arranged at the corresponding tip 92 .

[0047] The tip end 92 and the socket end 94 have such an axial length that electric heating devices 22 having different thicknesses can be arranged between the fluid housing 10 and the housing bottom 14 without destroying the seal between the housing base 4 and the fluid housing 10. As a result, the inlet flow connection ES formed by the inlet channel segments 84, 86 can vary in length transverse to the plane E containing the electric heating device 22. The same applies to the outlet flow connection marked with the reference AS.

[0048] The fluid flow introduced into the electric heating device 2 via the inlet 58 is divided into two partial flows in the region of the distributor 62. The first partial flow T1 flows into the first heating chamber 6.1 via the overflow edge 72, while the second partial flow T2 passes through the inlet flow connection ES, flows through the second heating chamber 6.2, i.e. first through the inlet branch 68, then through the outlet branch 70, and finally through the outlet flow connection AS, merges with the first partial flow T1 in the region of the distributor 62, and the fluid flow resulting from the combination of the two partial flows T1, T2 is discharged through the outlet.

[0049] Figure 4The electrical connection principle of the circuit board 38 is also shown. The contact tongues 202 of the male plug contacts 204 protrude into the mounting plane of the circuit board 38, which can be identified by the support 200 of the circuit board 38, and are exposed at the free end of the plug (only the power plug 46 is shown) or at the free end of the connection tab 206 of the negative contact or at the free end of the connection tab 208 of the positive contact. Even after assembly, the connection tabs 206, 208, which are mainly surrounded by the synthetic material of the positioning frame 26, protrude beyond the fluid housing 10 arranged below the assembly level of the circuit board 38. The circuit board 38 can be plug-connected to all the contact tongues 202 by simply lowering in the direction of the housing bottom 14 (i.e. in a direction perpendicular to the flat extension of the housing bottom 14). The assembled circuit board 38 is placed on the support 200 and fixed relative to the housing base 2 by screws (not shown) that engage with the threads of the support 200.

[0050] Figure 5 A top view of an opened electric heating device 2 according to the invention is shown. Figure 1 Compared with the illustration in FIG. 1 , the housing cover 42 is omitted; only the circuit board 38 of the control device 36 is schematically shown. Figure 1 ) on one side, there is a transistor insulator 40, which covers only a partial area 80 of the fluid housing cover. Four power switches 100 designed as bipolar transistors with insulated gate electrodes (IGBTs) (represented only by the transistor insulator 40) are located on the fluid housing cover 80 and thus on the second heating chamber 6.2. Figure 6 The arrows visible in show the flow course of the medium through the second heating chamber 6 . 2 .

[0051] also, Figure 6 Also shown are three connection tabs 206 for the negative contact of the first contact-connecting layer 20 and a connection tab 208 for the positive contact of the second contact-connecting layer 30 , which extend through corresponding recesses 116 of the transistor insulator 40 .

[0052] Figure 7 Schematically shows Figure 1 The cross section of the structure of the layered structure 34 shown in FIG. 1 includes a first insulating layer 18, a first contact connection layer 20, a heating device 22, a second contact connection layer 30 and a second insulating layer 32. Figure 8 , Fig. 9 and Fig.11As explained, in a variant of the invention, the transistor insulator 40, the second insulating layer 32 and the first insulating layer 18 are formed by a single insulating layer 102. During operation, the power switch 102 releases its power loss to the second heating chamber 6.2 via the single insulating layer 102. The heating device 22 comprises a plurality of heating elements 23 arranged in one plane, which are designed as PTC elements 24 here. The positioning of the PTC elements 24 is defined by a positioning frame 26 (see also Figure 1 and the aforementioned description of the figures). The first heating chamber 6.1 is formed on the first longitudinal side 110, and the second heating chamber 6.2 is formed on the second longitudinal side 112. The heating chambers 6.1 and 6.2 are Figure 6 Only reference numerals are used in the figure. For details, please refer to Figures 1 to 3 And related illustrations.

[0053] Figure 8 The above-mentioned main components of the electric heating device 2 are shown in layers. In the schematic diagram of the first embodiment of the present invention, the control device 36, the second heating chamber 6.2, the electric heating device 22 and the first heating chamber 6.1 can be seen from top to bottom. The circuit board 38 of the electric heating device 36 is provided with a power switch 100 on its lower side facing the second heating chamber 6.2, and the power switch 100 generates power loss during operation. This basic arrangement is also based on Figures 9 to 11 It is implemented in variants 2 to 4 of .

[0054] Reference numeral 102 denotes an insulating layer provided according to the present invention. As will be explained in more detail below, the insulating layer 102 is formed according to Figure 1 The first contact connection layer 20 and / or the second contact connection layer 30 and the transistor insulating member 40 are formed as an integral component.

[0055] In accordance with Figure 8 and Fig. 9 In a variation of , the insulating layer 102 extends between the electric heating device 22 and the first heating chamber 6.1 and between the electric heating device 22 and the second heating chamber 6.2. In addition, the insulating layer 102 is arranged on the side of the second heating chamber 6.2 facing away from the electric heating device 22, and forms insulation of the power switch 100 relative to the second heating chamber 6.2. The power transistor 100 is cooled via the second heating chamber 6,2. For example, the second heating chamber extends in the lateral direction beyond the width of the electric heating device 22 or the first heating chamber 6.1. The heat conduction path WL between the power transistor 100 and the second heating chamber 6.2 ends at the extended portion.

[0056] This design provides the possibility of indirectly applying the power transistor 100 to the second heating chamber 6.2 under prestressing by means of an elastic prestressing force V acting laterally on the layered layers, whereby good thermally conductive contact is provided between the power switch 100 and the second heating chamber 6.2 regardless of any heat-induced dimensional changes within the electric heating device.

[0057] Fig. 9 A slightly modified design is shown, in which the power switch 100 is arranged at the height of the plane HE2 containing the second heating chamber 6.2 and is coupled to the second heating chamber 6.2 in a heat-conducting manner. For this purpose, the insulating layer 102 is placed against the edge face of the second heating chamber 6.2, which in the embodiment shown extends at right angles to the main side face of the second heating chamber 6.2. In this design, the elastic preload V can also press the power switch 100 against the edge face of the second heating chamber 6.2 in a heat-conducting manner.

[0058] Fig.10 Shown corresponding to Figure 8 and Fig. 9 The heat conduction path WL between the first heating chamber 6.1 and the power switch 100 passes through the plane E containing the electric heating device and the plane HE2 containing the second heating chamber. To this end, the heat conduction path WL can be partially formed by a heat conductor 104, which is made of a material with very good thermal conductivity such as metal or ceramic and is firmly connected to the power transistor. Fig.10 As shown, the insulating layer 102 extends in a single plane and is arranged in the heat conduction path WL between the power switch 100 and the first heating chamber 6 . 1 and between the electric heating device 22 and the first heating chamber 6 . 1 .

[0059] In this variant, the first heating chamber 6 . 1 also extends laterally beyond the width of the electric heating device 22 ; there, the heat conduction path WL through the heat conductor 104 ends between the power switch 100 and the first heating chamber 6 . 1 heating it.

[0060] Fig.11 Shown according to Fig. 9 However, in this design, the insulating layer 102 is also as Figure 8 As shown in the figure, it is arranged in a meandering manner and passes through different planes of the layer, and the second heating chamber 6.2 is electrically insulated from the electric heating device 22 and the circuit board 38, and can also provide elastic support for the circuit board 38 relative to the second heating chamber 6.2.

[0061] The solution presented here has the following advantages:

[0062] 1. Since the electric heating device 22 is disposed in the metal housing 44, it has a good EMC shielding effect.

[0063] 2. Since there is a heating chamber 6.1; 6.2 on each side of the electric heating device 22, heat is dissipated from the two main sides of the electric heating device 22 to the medium to be heated.

[0064] 3. Since the medium to be heated is divided into the sub-streams T1 and T2, the two sides of the electric heating device 22 have the same heating conditions. This also applies to the corresponding branches 68 and 70. The PTC elements 24 distributed relative to the housing bottom 14 are respectively located between the heat output surfaces provided by the first heating chamber 6.1 and the second heating chamber 6.2, and the first heating chamber 6.1 and the second heating chamber 6.2 apply the same temperature gradient to each PTC element 24.

[0065] 4. All housing parts are made of aluminum or aluminum alloy, thus reducing weight.

[0066] 5. All housing parts 4 , 20 ; 78 , 80 delimiting the respective heating chamber 6 . 1 , 6 . 2 are welded together directly in a liquid-tight manner, which results in a high reliability in terms of sealing.

[0067] 6. The heating chambers 6.1, 6.2 can also be subjected to a sealing inspection after the housing parts 4, 20; 78, 80 that respectively form the heating chambers 6.1, 6.2 are welded and before the electric heating device 2 is finally assembled.

[0068] 7. Since the length of the flow connections ES and AS for the inlet and outlet of the medium can be varied, electric heating devices 22 of different thickness and therefore different performance can be installed without changing the housing parts 4, 20; 78, 80 defining the first or second heating chamber 6.1; 6.2.

[0069] 8. The distributor 62 is able to distribute equal partial flows T1 , T2 with the same volume flow rate and low effective pressure loss.

[0070] 9. The inlet and outlet ports 50; 52 are connected to the housing base 4 as separate components so that these interfaces can be adapted to connect pipes or lines according to customer requirements without having to change the components defining the first or second heating chambers 6.1, 6.2.

[0071] 10. The electrical insulation that would need to be provided in different planes of the layered structure can be achieved by a single insulating layer 102, thereby reducing the parts required to assemble the electric heating device 2 and reducing the assembly effort. If the heat conduction path WL leads to a plane in which the insulating layer 102 is already present, corresponding advantages are also achieved.

[0072] Reference numerals list

[0073] 2 Electric heating equipment

[0074] 4 Shell base

[0075] 6.1 First Heating Chamber

[0076] 6.2 Second Heating Chamber

[0077] 8 Heating chamber cover

[0078] 10 Fluid housing

[0079] 12. Chamber

[0080] 14 Shell bottom

[0081] 16 Surrounding wall

[0082] 18 First insulation layer

[0083] 20 First contact connection layer

[0084] 22 Heating device

[0085] 23 Heating element

[0086] 24 PTC components

[0087] 26 Positioning frame

[0088] 28 Accommodation

[0089] 30 Second contact connection layer

[0090] 32 Second insulation layer

[0091] 33 Preload device

[0092] 34 Layered Structure

[0093] 36 Control Device

[0094] 38 Circuit Board

[0095] 40 Transistor Insulator

[0096] 42 Housing cover

[0097] 44 Shell

[0098] 46 Power plug

[0099] 48 Control plug

[0100] 50 Inlet Port

[0101] 52 Exit Port

[0102] 53 Sealing structure

[0103] 54 Sealing ring

[0104] 56 screws

[0105] 58 Entrance

[0106] 60 Exit

[0107] 62 Distributor

[0108] 64 Inlet distributor segment

[0109] 66 Outlet distributor segment

[0110] 68 Entrance Branch Road

[0111] Exit 70 Branch Road

[0112] 72 Overflow Edge

[0113] 74 first heating chamber bottom

[0114] 76 guide ribs

[0115] 78 Fluid housing base

[0116] 80 fluid housing cover

[0117] 82 fixing holes

[0118] 83 Thread

[0119] 84 First entrance passage section

[0120] 86 First exit channel segment

[0121] 88 Second entrance passage section

[0122] 90 Second exit channel segment

[0123] 92 Tip

[0124] 94 socket end

[0125] 96 Lean on the shoulder

[0126] 100 Power Switch

[0127] 102 Insulation layer

[0128] 104 Heat Conductor

[0129] 110 First long side

[0130] 112 Second longest side

[0131] 116 grooves

[0132] 200 Support

[0133] 202 tongue contact

[0134] 204 Male plug contacts

[0135] 206 Negative contact connection flag

[0136] 208 Connection flag for positive contact

[0137] AS Outlet Stream Connection

[0138] ES Inlet Stream Connection

[0139] E plane containing the electric heating device

[0140] HE1 Plane containing the first heating chamber

[0141] HE2 Plane containing the second heating chamber

[0142] L Longitudinal axis

[0143] T1 First shunt

[0144] T2 Secondary shunt

[0145] WL Heat conduction path

Claims

1. An electric heating device (2), comprising: an electric heating device (22); a heating chamber (6.1; 6.2) thermally connected to the electric heating device with an insulating layer (18; 32; 102) interposed therebetween for heating a medium; and a control device (36), the control device comprising at least one power switch (100) for generating power loss, the power switch being connected to the medium via a heat conduction path (WL) for conducting away the power loss, It is characterized in that An insulating layer (102) is also disposed in the heat conduction path (WL).

2. The electric heating device according to claim 1, characterized in that: The control device (36) preferably comprises a circuit board (38), and the heating chamber (6.1) is arranged between the electric heating device (22) and the circuit board (38).

3. The electric heating device according to claim 2, characterized in that: The power switch (100) is arranged in a plane (E) containing the electric heating device (22).

4. An electrical heating device according to any one of the preceding claims, characterised in that A first and a second heating chamber (6.1; 6.2), an electric heating device (22) being accommodated between the first heating chamber and the second heating chamber, wherein the insulating layer (102) is arranged between the first heating chamber (6.1) and the electric heating device (22), and / or between the second heating chamber (6.2) and the electric heating device (22), and / or between the power switch (100) and the first or second heating chamber (6.1; 6.2).

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