Electric heating device

Abstract

The invention relates to an electric heating device 2. The heating device comprises two heating chambers 6.1 and 6.2, and an electric heating assembly 22 is formed between the two heating chambers. A flow of medium to be heated, which enters the electric heating device 2 in an inflow direction 106, is divided into a first partial flow T1 and a second partial flow T2 via a distributor 62. The first partial flow T1 flows through the first heating chamber 6.1 and the second partial flow T2 flows through the second heating chamber 6.2. To this end, the dispenser 62 has a dispensing body 71, which is preferably configured as a conical body 73 that is rotationally symmetrical about an axis of symmetry 104. Preferably, the axis of symmetry 104 is parallel to the inlet axis 59. Alternatively, the dispensing body 71 may also be configured as an overflow edge 72.

Description

Technical Field

[0001] The present invention relates to an electric heating device for heating a liquid medium, the electric heating device comprises a first heating chamber, a second heating chamber and an electric heating component, the electric heating component is arranged between the first heating chamber and the second heating chamber and coupled to the first heating chamber and the second heating chamber in a heat-conducting manner. Background Art

[0002] Such an electric heating device is known, for example, from EP 2 599 573 A1. The heating device described therein comprises an electric heating assembly formed between two heating chambers. According to this prior art, the heating chambers flow through one after the other. This results in different temperature changes of the medium to be heated relative to the heating devices in the two heating chambers. The medium flowing through the first heating chamber is much cooler than the medium flowing through the second heating chamber. This results in an uneven heat dissipation of the heat generated in the electric heating assembly to the medium.

[0003] On this basis, the problem underlying the present invention is to provide an electric heating device which is improved with regard to uniform heat dissipation of the heating device. Summary of the invention

[0004] In order to solve this problem, an electric heating device for heating a liquid medium is provided, the electric heating device comprising a first heating chamber, a second heating chamber and an electric heating component, the electric heating component is arranged between the first heating chamber and the second heating chamber, and is coupled to the first heating chamber and the second heating chamber in a heat-conducting manner, wherein a distributor for distributing the medium is formed between the first heating chamber and the second heating chamber, wherein the distributor comprises a distribution body, and the medium introduced into the distributor through the distribution body is divided into a first sub-flow and a second sub-flow, the first sub-flow is guided into the first heating chamber and the second sub-flow is guided into the second heating chamber.

[0005] The electric heating device according to the invention is a flat or planar electric heating device, in which there is an electric heating assembly comprising at least one electrically operable heating element, on each longitudinal side of which a heating chamber is arranged, which has a flow path for the medium to be heated. The heating device is thus flat, in particular the heating device is configured as a cuboid type, having two longitudinal sides which are significantly larger than the edge sides connecting the longitudinal sides, in particular at least 5 times larger.

[0006] The at least one electrical heating element is an electrically heatable heating element, preferably a resistance heating element or a PTC element. In this case, the heating device and its at least one heating element are located in one plane, and each heating chamber and its at least one flow path are located in a heating chamber plane aligned parallel to the plane of the heating element or heating device.

[0007] The PTC element is made of a material having a positive temperature coefficient (PTC) and is preferably in the form of a ceramic cuboid component. The cuboid component has two main side surfaces aligned parallel to each other and connected to each other through the peripheral side. Each main side surface is at least 5 times larger than the surface of the peripheral side, preferably even larger than the sum of the surfaces of all peripheral sides. Each main side surface is provided with a metallization for energizing, and a conductive contact layer (preferably a contact sheet) is against the metallization. An electrically insulating layer is formed on the side of the contact layer opposite to the corresponding main side surface, which realizes the electrical insulation of the contact layer. The contact layer can also be formed as a conductive coating on the electrically insulating layer. In other words, the contact layer and the electrically insulating layer according to the present invention can be formed by a single component providing multiple functional areas. In any case, the PTC element is applied to the contact layer in a conductive manner and energized via the contact layer. Alternatively, other electrically heatable heating elements can be used as at least one heating element instead of the PTC element, preferably as a resistive heating element. It is preferred that the heating device includes a configuration of at least one PTC element.

[0008] The heating chamber is preferably made of a metallic material, particularly preferably of an aluminum-containing material, in particular by a casting or die-casting process. The electric heating device of the invention is particularly suitable for operation with high voltage currents, such as those used for drives in electric vehicles. In particular, according to the invention, currents exceeding 400 volts, optionally exceeding 700 volts, are considered to be high voltage currents.

[0009] The distributor according to the invention allows the medium to be divided into two sub-flows, which flow through the two heating chambers of the electric heating device simultaneously and in the same direction. This is achieved by a distribution body, which separates the medium flow impinging on it and turns the first sub-flow in the direction of the first heating chamber and the second sub-flow in the direction of the second heating chamber. Since the medium flows through the heating chambers formed on the two longitudinal sides around the heating device at the same time, it flows into the two heating chambers at the same temperature and is then heated in the two heating chambers. Thus, the known disadvantages of the prior art, namely that there is a large difference between the temperature of the medium flowing into the first heating chamber and the temperature of the medium flowing into the second heating chamber, are overcome. Compared with the prior art, this makes the heating of the medium more uniform and the heat dissipation of the two heating chambers by the heating device more uniform.

[0010] In this case, the distribution body is preferably configured such that the two partial flows differ from each other by at most 10%, preferably by at most 5%, particularly preferably by at most 2%. Particularly preferably, the medium is divided into two partial flows of equal size so that the same partial flow of the medium flows through the two heating chambers. In this way, uniform heating of the medium can be achieved in the two heating chambers.

[0011] Preferably, the flow guide for the medium to be heated in the electric heating device is formed so that the pressure loss between the inlet and the outlet is very low. The inlet and the outlet are usually formed by a nozzle, and the hose or the pipe is connected to the electric heating device via the nozzle. Therefore, the pressure loss is the pressure loss of the total medium flowing through the heating device. Low pressure loss can be maintained by avoiding corners and sharp edge deflections in the flow, distributing the total inflow flow with low loss into a shunt, and the guide ribs in each heating chamber. At 50°C, the flow condition of water flowing through the electric heating device is 10l / min, and the pressure difference between the inlet and outlet of the electric heating device can be no more than 100mbar, preferably no more than 55mbar, and more preferably no more than 18mbar. The guide ribs can direct and guide the flow in the heating chamber, thereby generating a vortex-free flow. However, the guide ribs can also define separate flow channels in the heating chamber and between the inlet and outlet of the corresponding heating chamber. The heating chambers are usually configured to be the same.

[0012] Preferably, in a heating chamber cover covering the first heating chamber on the side opposite to the heating device, an inlet is formed which is flow-connected to the distributor. In this case, it is particularly preferred that the inlet covers the distribution body. The medium to be heated is supplied through the heating chamber cover, which is formed on the side opposite to the heating assembly and closes the heating chamber in a fluid-tight manner, thereby allowing a compact structure of the electric heating device. The inlet is flow-connected to the distributor, so that the medium first flows into the distributor and is then divided into two shunts by the distributor, and then the two shunts flow into the two heating chambers. If the inlet covers the distribution body, this makes the medium flowing through the inlet directly hit the distribution body. This means that the distributor can be simply constructed and easily connected to the inlet.

[0013] Preferably, the distributor is formed in a plane including the first heating chamber, and particularly preferably, in a configuration in which an inlet is formed in a heating chamber cover covering the first heating chamber on the opposite side of the heating device, the inlet being connected to the distributor flow. This makes the structure between the inlet and the distributor compact and the structural connection simple. The distributor is preferably located in a plane including the first heating chamber. In this case, it is more preferred that the distributor is connected to an inlet flow connection, which connects the distributor to the second heating chamber, wherein the inlet flow connection passes through the plane including the heating device. The inlet flow connection is usually a flow connection that extends strictly at right angles relative to the plane including the heating device and then usually passes through the plane. The same applies to the outlet flow connection, which is formed on the outlet side, but is generally configured in the same manner as the inlet flow connection in other respects. In this way, the second split flow can be transported in a simple manner in the direction of the second heating chamber, and a compact and simple structure of the electric heating device is realized. The medium to be heated is supplied from one side of the electric heating device and is distributed to the two heating chambers in the distributor.

[0014] Preferably, the distributor has an inlet distributor section, which is in flow connection with the inlet branch and the inlet flow connection of the first heating chamber. In this case, it is particularly preferred that the distribution body is formed between the inlet distributor section and the inlet branch of the first heating chamber. The inlet distributor section extends between the distribution body and the inlet flow connection in a plane including the first heating chamber. In the same way, the outlet distributor section is preferably formed by a distributor, which extends between the distribution body and the outlet flow connection in a plane including the first heating chamber.

[0015] This further development then provides that the flow connection extends transversely with respect to a plane comprising the heating device, and the inlet flow connection and the outlet flow connection extend parallel to this plane, in particular in a plane comprising the first heating chamber. Preferably, the distributor sections are arranged approximately axially symmetrical to one another with respect to a longitudinal axis of the housing, which has its greatest extension in a plane comprising the heating chamber or in a plane comprising the heating device. These planes are usually parallel to one another in the electric heating device.

[0016] Preferably, in a top view of a plane including the first heating chamber, the distributor section has an approximately triangular floor area. It will be appreciated that such a triangular floor area is provided with rounded corners. The area usually referred to as the top of the triangle is rounded and can be arranged near the distribution body, which is usually located at the edge of the triangular floor area. The corresponding flow connection is arranged opposite the round top of the triangular floor area.

[0017] Preferably, in one embodiment, the overflow edge is formed as a distribution body. The overflow edge is easy to form. At the same time, the overflow edge is aligned so that a roughly equal distribution of the two partial flows is achieved. This can be achieved, for example, in that the medium flow entering the distributor flows centrally toward the overflow edge, and the overflow edge is aligned so that each side of the overflow edge conveys the partial flow in the direction of the heating chamber.

[0018] Preferably, the overflow edge passes centrally through the inlet of the distributor. This means that the inlet or the protrusion of the inlet towards the distribution body is cut centrally by the overflow edge, thereby dividing the inlet or the protrusion of the inlet towards the overflow edge into two halves of equal size. This makes it easy to achieve a substantially uniform division of the medium into two partial flows.

[0019] In other embodiments, a conical body that is rotationally symmetrical relative to the axis of symmetry is preferably configured as a distribution body. In this case, the conical body has a shell surface that ends with a top. The top is located on the axis of symmetry. In a preferred variant, in this case, the shell surface has a straight generatrix, i.e., a straight outer boundary of the conical shell. In this case, for example, the conical body is a straight cone. In another particularly preferred variant, the generatrix is ​​curved. In particular, the shell surface of the conical body is concave. The configuration of the distribution body as a rotationally symmetrical conical body allows the distribution of the two shunts to be accurately adapted to the corresponding fluid dynamic conditions downstream of the distribution body. In particular, by adapting the shape of the conical body, i.e., in particular, adapting the diameter of the circular base and / or the height of the conical body and / or the shape of the shell surface, the division of the medium flow into the two shunts can be accurately adapted. In particular, a good distribution of the shunt can be achieved by means of the concave shell surface, in particular, the division into two shunts of substantially the same size can be achieved.

[0020] Preferably, the axis of symmetry of the conical body is parallel to or colinear with the direction in which the medium flow hits the distribution body. In particular, the axis of symmetry of the conical body corresponds to the axis of symmetry of the inlet or inlet nozzle through which the medium is fed into the distributor. Alternatively or additionally, the axis of symmetry corresponds to the direction in which the medium flows into the distributor. Alternatively or additionally, the conical body is formed centrally to the distributor relative to the inlet. These measures result in the fact that the medium flow flows centrally and straightly towards the distribution body, so that a precise division of the flow into two partial flows is achieved. Preferably, the conical body is formed centrally relative to the inlet or inlet nozzle for the medium, so that the flow is directed centrally to the top of the conical body.

[0021] Preferably, the split flows from the first heating chamber and the second heating chamber are joined together by a distributor. For this purpose, the distributor preferably has another distribution body, which is preferably configured and positioned as described above. This other distribution body brings the two split flows together to form a medium flow, which then leaves the electric heating device through an outlet, which is preferably formed in the heating chamber cover, and may leave the electric heating device through an outlet nozzle. For the relationship between this other distribution body and the outlet and / or outlet nozzle, the relationship between the above-mentioned distribution body and the inlet and / or inlet nozzle is suitable. In addition, the above-mentioned content about shape, size and alignment is also suitable for this other distribution body.

[0022] According to a preferred further development of the present invention, the first heating chamber is formed between the bottom of the housing of the housing base part and the heating chamber cover connected to the housing base part. This connection usually makes the interior of the housing sealed relative to the environment. The housing base part usually forms the inlet and outlet of the medium to be heated. The second heating chamber is preferably formed by a fluid housing, which is usually located in the housing. The housing base part usually forms a distributor, and the medium introduced through the inlet is divided into a shunt flowing to the first heating chamber and a shunt flowing to the second heating chamber by the distributor, and the shunt from the first heating chamber and the shunt from the second heating chamber are merged together by the distributor. The distributor is usually located on one side of the fluid housing or one side of the heating device. Therefore, the flow is guided in an annular manner above the ground area of ​​the heating device. The distributor is usually located outside the ground area of ​​the flat heating device. The distributor is usually arranged in a plane including the first heating chamber. In other words, the shunt from the inlet is discharged directly at the level of the first heating chamber by introducing the medium into the inlet channel of the electric heating device, and is also returned at this level through the outlet channel. The corresponding configuration ensures that the flow through the electric heating device has a relatively low flow resistance and thus has a relatively low efficiency loss. The housing base part is preferably connected to an inlet nozzle leading to the inlet and an outlet nozzle communicating with the outlet. These nozzles can be screwed to the housing base part, riveted to the housing base part, welded to the housing base part, brazed to the housing base part, or bonded to the housing base part, which is configured as a casting or deep-drawn part, or connected in some other way to form a single part. The nozzle is used to connect the electric heating device to a hose or pipe carrying the medium to be heated in the interior of the vehicle.

[0023] Preferably, the housing base portion forms a first inlet channel section connected to the inlet nozzle and / or a first outlet channel section connected to the outlet nozzle. Preferably, the fluid housing forms a second inlet channel section aligned with the first inlet channel section and / or a second outlet channel section aligned with the first outlet channel section. In this aspect, the second inlet channel section and / or the first outlet channel section are usually arranged downstream of the distributor in the flow direction. The first inlet channel section and the first outlet channel section are assigned to the first heating chamber. The second inlet channel section and the second outlet channel section are assigned to the second heating chamber. Merging the inlet channel section and the outlet channel section with each other enables the flow diversion introduced into the fluid housing to be transmitted with a lower pressure loss.

[0024] The nozzles can be aligned with the channel sections. Typically, the nozzles and channel sections provide a medium flow at right angles to the layers of the electric heating device.

[0025] In order to establish a specific flow resistance that ensures that sufficient shunt flow is introduced into the first heating chamber or removed from the first heating chamber via the distributor, the nozzle, which is usually arranged outside the housing, can be offset relative to the inlet channel and the outlet channel. The offset deflects the flow laterally so that the introduced flow is evenly distributed between the first heating chamber and the second heating chamber with low flow resistance. The nozzle does not necessarily extend at right angles to the plane including the heating device.

[0026] Forming two distribution bodies in the distributor, one of which is arranged upstream of the inlet branches of the two heating chambers and the other of which is arranged downstream of the outlet branches of the two heating chambers, has various advantages.

[0027] 1. The two distribution bodies will cause a change in the pressure drop of the medium flow through the two heating chambers. By being able to change the two distribution bodies, the medium can be distributed more accurately into the two partial flows.

[0028] 2. The two distribution bodies are configured identically. In principle, this allows the electric heating device to be supplied with a medium fed in through an inlet (referred to herein as inlet and / or inlet nozzle) when discharged through an outlet (referred to herein as outlet and / or outlet nozzle) and a medium fed in through an outlet (referred to herein as outlet and / or outlet nozzle) when discharged through an outlet (referred to herein as inlet and / or inlet nozzle). This provides greater freedom of movement when installing the electric heating device, which is an advantage that is particularly important given the often limited installation space in a vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other details and advantages of the present invention will become apparent from the following description of the embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0030] Figure 1 : An exploded perspective view of a first embodiment of the present invention;

[0031] Figure 2 :according to Figure 1 An exploded perspective view of a housing base portion and a heating chamber cover of a first embodiment;

[0032] Figure 3 :according to Figure 1 An exploded perspective view of a fluid housing of a first embodiment;

[0033] Figure 4 :according to Figure 1 a top perspective view of a housing base portion of a first embodiment partially equipped with components; and

[0034] Figure 5 :along Figure 4 A cross-sectional view of the first embodiment drawn along line VV in FIG.

[0035] Figure 6 : A detailed perspective view of a first embodiment of the present invention;

[0036] Figure 7 : Figure 6 A detailed cross-sectional view of the first embodiment shown;

[0037] Figure 8 : a detailed perspective view of a second embodiment of the present invention; and

[0038] Fig. 9 : Detailed cross-sectional view of a second embodiment of the present invention. DETAILED DESCRIPTION

[0039] Figure 1 An electric heating device 2 is shown with a housing base part 4, which is provided 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 an accommodating space 12 formed by a housing base portion 4. The lower side of the accommodating space 12 is defined by a bottom 14, and the peripheral side is defined by a peripheral wall 16 extending from the bottom 14. In the accommodating space 12 and between the bottom 14 and the fluid housing 10, there is a first insulating layer 18 that can abut against the bottom 14, a first contact layer 20, a heating assembly 22 having a plurality of heating elements 23 (in the form of PTC elements 24 in this example), and a positioning frame 26 having an accommodating portion 28 for accommodating the PTC elements 24.

[0040] A second contact layer 30 is provided on the side of the heating component 22 opposite to the first contact layer 20, and a second insulating layer 32 is arranged on the side of the second contact layer 30 opposite to the heating component 22. Therefore, the PTC element is applied with conductivity against the contact layers 20, 30, and is energized via the contact layers 20, 30. The PTC element 24 is a ceramic cuboid component, and the PTC element 24 is provided with a metallization on the opposite main side surface for current conduction. The main side surface is the surface of the cuboid with the largest surface area. The main side surfaces are connected to each other by the peripheral surface, which defines the height of the PTC element and has no metallization. Each main side surface is approximately 5 times larger than one of the peripheral surfaces, preferably larger than the sum of all peripheral surfaces.

[0041] The second insulating layer 32 is formed into a biasing device 33 by a silicone film, and the silicone film can absorb a certain compression through elastic deformation, thereby arranging the electric heating component 22 between the shell base part 10 and the shell bottom 14, and biasing the electric heating component 22 against the shell base part 10 and the shell bottom 14.

[0042] The layering of the first insulating layer 18 , the first contact layer 20 , the heating device 21 , the second contact layer 30 and the second insulating layer 32 is also referred to below as a layered structure 34 .

[0043] In the 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 printed circuit board 38 forming the control device 36 and the fluid housing 10. Reference numeral 42 denotes a housing cover which is connected to the housing base part 4 to form a Figure 5 The housing is denoted by reference numeral 44 in FIG. The housing base part 4 and the housing cover 42 (and possibly other housing parts) are configured to be shielded (i.e., made of metal), and / or separate shields are provided in the interior, exterior or walls of the individual housing parts (the individual housing parts can be conceivably made of plastic). The preferred metal material is aluminum, or, in view of corrosion resistance, the preferred metal material is stainless steel.

[0044] The point source connector 46 and the control connector 48 are Figure 1 4 is shown as being located at the lower side of the housing base part 4 opposite the housing cover 42. The two connectors 46, 48 are connected to the housing base part 4 in a sealed manner and have various male electrical plug contacts, which pass through the respective housings of the connectors 46, 48 in a sealed manner and make plug contacts in the printed circuit board 38 and are electrically connected to the strip conductors of the printed circuit board 38 via the plug contacts. Figure 4 For the plug-in contact, the printed circuit board 38 has a female contact tongue receptacle as described in EP 2 236 330 A1.

[0045] Furthermore, an inlet nozzle 50 and an outlet nozzle 52 are provided on the lower side for connecting a pipe or a hose carrying the fluid to be heated. Figure 1 , which is formed by two sealing rings 54, which are explained in more detail below. Reference numeral 56 denotes a screw, which is used to fix the fluid housing 10 relative to the housing base part 4 with the layered structure 34 inserted. By means of this screw connection, the layers of the layered structure 34 are biased against the fluid housing 10 and the bottom 14 of the housing base part 4.

[0046] Figure 2 An exploded view of a housing base part 4 and a heating chamber cover 8 is shown, the heating chamber cover 8 being shown separated from the housing base part 4 and showing the interior of the first heating chamber 6.1. It can be seen that the nozzles 50, 52 are formed by separate parts which are aligned with two holes in the heating chamber cover 8 formed by a flat metal sheet or metal plate, one of which forms the inlet 58 and the other forms the outlet 60. The nozzles 50, 52 may be welded or bonded to the heating chamber cover 8.

[0047] Reference numeral 62 denotes a distributor arranged in a plane HE including the first heating chamber 6.1. The distributor 62 has an inlet distributor section 64 and an outlet distributor section 66, which are arranged to be separated from each other and covered by a heating chamber cover 8. Each distributor section 64, 66 is arranged to be symmetrical with respect to the longitudinal axis L of the housing base part 4, and is associated with an inlet branch 68 and an outlet branch 70 of the first heating chamber 6.1, respectively. In a top view, the distributor sections 64, 66 each have a ground area that is approximately triangular. Each distributor section 64, 66 merges into each corresponding branch 68, 70 via a distribution body 71 formed as an overflow edge 72. The distribution body 71 formed as an overflow edge 72 is located between the first heating chamber bottom 74 of the first heating chamber 6.1 and the opposite cover surface of the first heating chamber 6.1 in the height direction, and the cover surface is formed by the heating chamber cover 8.

[0048] A flow guiding rib 76 protrudes from the first heating chamber bottom 74 to guide the fluid, and the heating chamber cover 8 abuts against the flow guiding rib 76 in a fluid-tight manner.

[0049] In each case, the inlet 58 or outlet 60 is arranged such that it partially covers the first heating chamber 6.1 and partially covers the respective distributor section 64, 66. A distribution body 71 configured as an overflow edge 72 passes approximately centrally through the hole forming the inlet 58 or outlet 60.

[0050] exist Figure 3 Details of the second heating chamber 6.2 can be seen in FIG. The fluid housing 10 is formed by a fluid housing base part 78 and a fluid housing cover 80, which is welded to the fluid housing base part 78. The second heating chamber 6.2 also comprises a flow guide rib 76. A plurality of fastening eyelets 82 are provided on the periphery of the fluid housing 10, through which screws 56 are guided in order to connect the fluid housing 10 to the housing bottom 14 with the electric heating assembly 22 inserted. Figure 4 , the thread formed on the housing bottom 14 is indicated by reference numeral 83 .

[0051] exist Figure 4In the embodiment of the present invention, reference numeral 84 denotes a first inlet channel section, and reference numeral 86 denotes a first outlet channel section. These channel sections 84, 86 are formed on the housing base part 4 and pass through the housing base part 4. Figure 3 The second inlet channel section 88 and the second outlet channel section 90 are shown as being integrally formed on the fluid housing base portion 78. The first inlet channel section 84 and the second inlet channel section 88 form an inlet flow connection ES. The first outlet channel section 86 and the second outlet channel section 90 form an outlet flow connection AS. The inlet flow connection ES and the outlet flow connection AS are formed at Figures 2 to 4 As shown in FIG. 1 , the inlet flow connection ES is also Figure 5 is shown in .

[0052] Especially by Figure 5 What is conveyed is that the second channel sections 88, 90 are formed as terminal ends 92, each terminal end 92 is joined to a bushing end 94 formed by the first channel sections 84, 86, wherein the sealing arrangement 53 is disposed between the terminal ends 92 and the bushing ends 94 and abuts against an abutment shoulder 96 disposed on the respective terminal ends 92 in the axial direction and in the radial direction.

[0053] The tip end 92 and the bushing end 94 have an axial length such that the electric heating assembly 22 having different thicknesses can be arranged between the fluid housing 10 and the housing bottom 14 without damaging the seal between the housing base portion 4 and the fluid housing 10. Thus, the inlet flow connection ES formed by the inlet channel sections 84, 86 is variable in length transverse to or perpendicular to the plane E including the electric heating assembly 22. The same applies to the outlet flow connection denoted by the reference numeral AS. In this context, the inlet flow connection ES and the outlet flow connection AS pass through the plane E.

[0054] The fluid flow introduced into the electric heating device 2 through the inlet 58 is divided into two partial flows in a blade-like manner in the region of the distributor 62 by the distribution body 71 formed as an overflow edge 72 in this first embodiment. The other distribution body 75 corresponding to the distribution body 71 is formed opposite to the outlet 60 and the outlet nozzle 52. The other distribution body 75 is configured similarly to the distribution body 71, in this case, it is configured as an overflow edge 72. The positioning of the other distribution body 75 relative to the outlet 60 and the outlet nozzle 52 is similar to the positioning of the distribution body 71 relative to the inlet 58 and the inlet nozzle 50. The first partial flow T1 flows into the first heating chamber 6.1 via the overflow edge 72, while the second partial flow T2 travels through the inlet flow connection ES, flows through the second heating chamber 6.2, first through the inlet branch 68, and 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 generated by the combination of these two partial flows T1 and T2 is discharged through the outlet. When the partial flows T1 , T2 are combined, they flow through the further distribution body 75 , then flow through the outlet 60 into the outlet nozzle 52 , and flow out of the electric heating device 1 through the outlet nozzle 52 .

[0055] Figure 4 The electrical connection concept of the printed circuit board 38 is also conveyed. The contact tongues 202 of the male plug contacts 204 are exposed at the free end of the connector (only the point source connector 46 is shown), or at the free end of the terminal lugs 206 of the negative contact, or at the free end of the terminal lugs 208 of the positive contact, and the contact tongues 202 protrude into the mounting plane of the printed circuit board 38, which can be identified by the support 200 for the printed circuit board 38. The terminal lugs 206, 208 also protrude beyond the fluid housing 10 after assembly, which is arranged below the mounting plane of the printed circuit board 38. By simply lowering the printed circuit board 38 in the direction of the housing bottom 14 (i.e. in a direction orthogonal to the plane extension of the housing bottom 14), the printed circuit board 38 can be plugged into contact with all the contact tongues 202. The mounted printed circuit board 38 rests on the support 200 and is fixed against the housing base part 2 by means of screws (not shown) which engage in threads of the support 200 .

[0056] Figure 6 A perspective view of the region of the dispenser 62 in a first embodiment of the invention is shown. To avoid repetitions, reference is made to the above description, in particular Figure 2 Here, in this context, the housing base part 4 is shown in a bottom view, wherein the heating chamber cover 8 is shown as being partially transparent. The dispenser 62 comprises a dispensing body 71 which is configured as an overflow edge 72 in this embodiment. Figure 7A cross section along the overflow edge 72 is shown. Unless explicitly stated to refer to one of the drawings, the following description will be made together. Figure 6 and Figure 7 .

[0057] During operation, the medium flows through the inlet 58 along the flow direction 106 ( Figure 7 ) and flows into the distributor 62. There the medium impinges on the distribution body 71 formed as an overflow edge 72, which passes centrally through the inlet 58. This means (see in particular Figure 6 ) The projection of the inlet 58 is divided into two equal parts in the center by the overflow edge 72. Thus, a first partial flow T1 is formed, which flows into the inlet branch 68 ( Figure 6 In this context, the flow in the first heating chamber 6.1 is guided by the flow ribs 76. The second partial flow T2 is guided via the inlet distributor section 64 and the inlet flow connection ES ( Figure 6 ) and flows into the second heating chamber 6.2.

[0058] The overflow edge 72 is configured as a thin edge which divides the medium flow through the inlet 58 into a first partial flow T1 and a second partial flow T2 in a blade-like manner. The distribution body 71 is configured so that the sizes of the partial flows T1, T2 are substantially the same and differ from each other by at most 10%, so that about 45% to 55% of the inflowing medium forms the first partial flow T1 and the rest forms the second partial flow T2.

[0059] Figure 8 and Fig. 9 A second embodiment of the invention is shown, which differs from the first embodiment in the shape of the dispensing body 71 and the other dispensing bodies 75 in the dispenser 62. In the following, only the differences from the first embodiment are described, otherwise reference is made to the above explanations to avoid repetition. Figure 8 A bottom perspective view of an electric heating device 2 is shown, wherein the heating chamber cover 8 is shown as partially transparent, and Fig. 9 62 shows a cross-section of the electric heating device 2 in the region of the distributor 62. If no explicit reference is made to a figure, the following description will be made together with the Figure 8 and Fig. 9 . In addition, the distribution body 71 will be described in detail below. The other distribution bodies 75 have the same shape and size. Therefore, the position of the other distribution bodies 75 relative to the outlet 60, the outlet nozzle 52, the outlet distributor section 66 and the outlet flow connection AS is the same as the position of the distribution body 71 relative to the inlet 58, the inlet nozzle 50, the inlet distributor section 64 and the inlet flow connection ES.

[0060] In the second embodiment, the dispensing body 71 is configured as a rotationally symmetrical conical body 73. The conical body 73 is characterized by a rotational symmetry axis 104 (see Fig. 9 ) of a rotationally symmetrical shape. In this embodiment, the conical body 73 is not a straight cone; instead, the conical body 73 has a concave shell surface 100. In the second embodiment, the symmetry axis 104 is aligned with the inlet axis 59 ( Fig. 9 ), the inlet axis 59 passes centrally through the circular inlet 58 in the heating chamber cover 8. At the same time, the inlet axis 59 is also the axis of symmetry of the inlet nozzle 50 and the inlet 58. The conical body 73 is formed centrally relative to the inlet 58, and the inlet axis 59 is parallel to the top 102 ( Fig. 9 ) intersect, so that the medium flowing through the inlet nozzle 50 and the inlet 58 and entering the distributor 62 along the inflow direction 106 (which points downwardly parallel to the inlet axis 59) hits the conical body 73 centrally.

[0061] The use of a conical body 73 as the distribution body 71 ensures an effective and good deflection of the flow and divides the flow into two partial flows T1, T2 towards the inlet branch 68 and the inlet distributor section 64 of the first heating chamber 6.1 and via the latter to the inlet flow connection ES ( Figure 8 ), and flows therethrough to the second heating chamber 6.2. In particular, by adapting the concave housing surface 100, a good adaptability to the flow conditions in the first heating chamber 6.1 and the second heating chamber 6.2 is provided, so that two sub-flows T1, T2 of substantially equal size can be obtained.

[0062] Fig. 9 An alternative configuration of the inlet nozzle 50 compared to other figures of this document is shown, which alternative configuration can be interchanged with the configurations of the inlet nozzle 50 and the outlet nozzle 52 shown in other figures. In the present invention, the inlet nozzle 50 and the outlet nozzle 52 are preferably connected to the heating chamber cover 8 in a material-locked manner, in particular, in an adhesive, welded and / or fusion-welded manner.

[0063] The present invention relates to an electric heating device 2, which has two heating chambers 6.1 and 6.2, and an electric heating assembly 22 is formed between the two heating chambers 6.1 and 6.2. The distributor 62 is used to divide the flow of the medium to be heated that enters the electric heating device 2 along the inflow direction 106 into a first branch flow T1 and a second branch flow T2. The first branch flow T1 flows through the first heating chamber 6.1, and the second branch flow T2 flows through the second heating chamber 6.2. To this end, the distributor 62 has a distribution body 71, which is preferably configured as a conical body 73 that is rotationally symmetrical about the symmetry axis 104. Preferably, the symmetry axis 104 is parallel to the inlet axis 59. Alternatively, the distribution body 71 can also be configured as an overflow edge 72.

[0064] Reference numerals list

[0065] 2 Electric heating device

[0066] 4 Shell base part

[0067] 6.1 The first heating chamber

[0068] 6.2 Second Heating Chamber

[0069] 8 Heating chamber cover

[0070] 10Fluid housing

[0071] 12Accommodation space

[0072] 14 Shell bottom

[0073] 16 Peripheral wall

[0074] 18 first insulating layer

[0075] 20 First contact layer

[0076] 22 Heating components

[0077] 23 Heating elements

[0078] 24PTC components

[0079] 26 Positioning frame

[0080] 28 Accommodation

[0081] 30 Second contact layer

[0082] 32 Second insulation layer

[0083] 33 Bias device

[0084] 34 Layered Structure

[0085] 36 Control Devices

[0086] 38 PCB

[0087] 40 transistor insulation

[0088] 42 Shell cover

[0089] 44 Shell

[0090] 46 point source connector

[0091] 48 control connector

[0092] 50 Inlet Nozzle

[0093] 52 outlet nozzle

[0094] 53 Sealing arrangement

[0095] 54 Sealing ring

[0096] 56 screws

[0097] 58 Entrance

[0098] 59 entrance axis

[0099] Exit 60

[0100] 62 Distributor

[0101] 64 inlet distributor section

[0102] 66 outlet distributor section

[0103] 68 entrance branch

[0104] 70 exit branch

[0105] 71 Allocation subject

[0106] 72 Overflow Edge

[0107] 73 Conical body

[0108] 74 Bottom of the first heating chamber

[0109] 75 allocation subject

[0110] 76 guide ribs

[0111] 78 Fluid housing base part

[0112] 80 fluid housing cover

[0113] 82 fastening holes

[0114] 83 thread

[0115] 84 First entrance channel section

[0116] 86 First outlet channel section

[0117] 88 Second entrance channel section

[0118] 90 Second exit channel section

[0119] 92 distal end

[0120] 94 Bushing end

[0121] 96 abutment shoulder

[0122] 100 Shell surface

[0123] 102 Top

[0124] 104 axis of symmetry

[0125] 106 Inflow direction

[0126] 200 Support

[0127] 202 tongue contact

[0128] 204 Male plug contact

[0129] 206 Terminal lug for negative contact

[0130] 208 Terminal lug for positive contact

[0131] AS outlet flow connection

[0132] ES inlet flow connection

[0133] E includes the plane of the electric heating component

[0134] HE includes a plane of the first heating chamber

[0135] L Longitudinal axis

[0136] T1 first shunt

[0137] T2 Secondary Shunt

Claims

1. An electric heating device (2) for heating a liquid medium, the electric heating device comprising a first heating chamber (6.1) and a second heating chamber (6.2) and an electric heating component (22), the electric heating component being arranged between the first heating chamber (6.1) and the second heating chamber (6.2), and the electric heating component being coupled to the first heating chamber (6.1) and the second heating chamber (6.2) in a heat-conducting manner, It is characterized in that A distributor (62) is formed between the first heating chamber (6.1) and the second heating chamber (6.2), and the medium is distributed through the distributor, wherein the distributor (62) includes a distribution body (71), and the medium introduced into the distributor (62) is divided into a first sub-flow (T1) and a second sub-flow (T2) by the distribution body, the first sub-flow is guided into the first heating chamber (6.1), and the second sub-flow is guided into the second heating chamber (6.2).

2. The electric heating device (2) according to claim 1, characterized in that: An overflow edge (72) is formed into the dispensing body (71).

3. The electric heating device (2) according to claim 2, characterized in that: The overflow edge (72) is centrally located across the inlet (58) into the distributor (62).

4. The electric heating device (2) according to claim 1, characterized in that: The dispensing body (71) is a conical body (73) which is rotationally symmetrical with respect to an axis of symmetry (104).

5. The electric heating device (2) according to claim 4, characterized in that: The axis of symmetry (104) corresponds to the flow direction (106) of the medium entering the distributor (62).

6. The electric heating device (2) according to claim 4 or 5, characterized in that: The conical body (73) has a concave outer shell surface.

7. The electric heating device (2) according to one of claims 4 to 6, characterized in that The inlet (58) of the distributor (62) is formed symmetrically with respect to an inlet axis (59), and the inlet axis (59) forms the symmetry axis (104) of the conical body (73).

8. The electric heating device (2) according to one of claims 4 to 7, characterized in that The conical body (73) is formed to be centered relative to the inlet (58) of the distributor (62).

9. The electrical heating device (2) according to one of the preceding claims, characterized in that The distribution body (71) is configured in such a way that the two partial flows (T1, T2) differ from one another by at most 10%, particularly preferably by at most 2%.

10. The electrical heating device (2) according to one of the preceding claims, characterized in that The distributor (62) is formed in a plane (HE) which includes the first heating chamber (6.1).

11. The electric heating device (2) according to claim 10, characterized in that: The distributor (62) is connected to an inlet flow connection (ES) and an outlet flow connection (AS), which connect the distributor (62) to the second heating chamber (6.2), wherein the inlet flow connection (ES) and the outlet flow connection (AS) extend in a transverse direction of a plane (E) including the heating device (2) and pass through this plane (E).

12. The electric heating device (2) according to claim 11, characterized in that: The distributor (62) comprises an inlet distributor section (64) extending between the distribution body (71) and the inlet flow connection (ES) in the plane (HE) comprising the first heating chamber (6.1).

13. The electric heating device (2) according to claim 11 or 12, characterized in that: The distributor (62) comprises an outlet distributor section (66) extending between the distribution body (71) and the outlet flow connection (AS) in the plane (HE) comprising the first heating chamber (6.1).

14. The electric heating device (2) according to claim 12 or 13, characterized in that: The distributor sections (64, 66) are arranged axially symmetrically to each other.

15. The electric heating device (2) according to one of claims 11 to 14, characterized in that In a top view of the plane (HE) including the first heating chamber (6.1), the distributor sections (64, 66) have an approximately triangular floor area, wherein the top of the triangular floor area is rounded and the corresponding flow connections (ES, AS) are arranged opposite the top.

16. Electrical heating device (2) according to one of the preceding claims, characterized in that The heating device (22) comprises at least one PTC element (24).

17. The electrical heating device (2) according to one of the preceding claims, characterized in that The partial flow (T1) from the first heating chamber (6.1) and the partial flow (T2) from the second heating chamber (6.2) are combined together through the distributor (62).

18. Electrical heating device (2) according to one of the preceding claims, characterized in that The first heating chamber (6.1) is formed between a housing bottom (14) of a housing base part (4) and a heating chamber cover (8) connected to the housing base part (4), the housing base part (4) forming an inlet (58) and an outlet (60) for the medium, wherein the second heating chamber (6.2) is formed by a fluid housing (10), and wherein the housing base part (4) forms a distributor (62).

19. The electric heating device (2) according to claim 17, characterized in that: The housing base portion (4) is connected to an inlet nozzle (50) leading to the inlet (58) and an outlet nozzle (52) leading to the outlet (60), and wherein the housing base portion (4) forms a first inlet channel section (84) communicating with the inlet nozzle (50) and / or a first outlet channel section (86) communicating with the outlet nozzle (52), and wherein the fluid housing (10) forms a second inlet channel section (88) aligned with the first inlet channel section (84) and a second outlet channel section (90) aligned with the first outlet channel section (86), and wherein the second inlet channel section (88) and the first outlet channel section (86) are arranged downstream of the distributor (62) in the flow direction.

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