LIQUID HEATING APPLIANCE, PARITCIULARLY WATER HEATING APPLIANCE

Abstract

An electrical liquid heating device, in particular water heating device, preferably for a motor vehicle, including at least a first conductive layer, in particular a first metal layer, a second conductive layer, in particular a second metal layer, and a polymer layer which contains a polymer component and a conductive carbon component and is arranged between the first and the second conductive layer, wherein liquid channels for conducting the liquid, in particular water, being heated are provided which extend from a first side of the polymer layer facing the first conductive layer to a second side of the polymer layer facing the second conductive layer.

Claims

1. Electrical liquid heating device for a motor vehicle, comprising at least a first conductive layer, in particular a first metal layer, a second conductive layer, in particular a second metal layer, and a polymer layer which contains a polymer component and a conductive carbon component and is arranged between the first and the second conductive layer, wherein liquid channels for conducting the liquid, in particular water, being heated are provided which extend from a first side of the polymer layer facing the first conductive layer to a second side of the polymer layer facing the second conductive layer.

2. Liquid heating device according to claim 1, wherein one or more of the liquid channels extend(s) through the first and/or the second conductive layer.

3. Liquid heating device according to claim 1, wherein one or more of the liquid channels is formed at least sectionally by a pipe, wherein the respective pipe is preferably electrically insulated in respect of the electrically conductive layer.

4. Liquid heating device according to claim 1, wherein the first and/or second conductive layer comprise(s) a plate and/or has/have a thickness of at least 0.1 mm and/or at most 5.0 mm.

5. Liquid heating device, in particular water heating device, according to claim 1, wherein the first and/or second conductive layer and/or the polymer layer is/are at least partially planar in design.

6. Liquid heating device according to claim 1, wherein the carbon component is present in particle form and/or as a carbon network.

7. Liquid heating device according to claim 1, wherein the carbon component is present in the form of soot and/or graphite and/or graphene and/or carbon fibres and/or carbon nano-tubes.

8. Liquid heating device according to claim 1, wherein the polymer component is configured in the form of an electrically insulating polymer component and/or a first polymer partial component based on ethylene acetate or ethylene acrylate copolymer and/or ethylene acrylate or ethylene acrylate copolymer and/or a second polymer partial component based on polyolefin, and/or polyester and/or polyamide and/or fluoropolymer.

9. Liquid heating device according to claim 1, wherein the polymer layer is preferably in contact via at least 20% of its side facing the first conductive layerwithout taking into account fuel channel openingswith the first conductive layer and/or via at least 20% of its side facing the second conductive layerwithout taking into account fuel channel openingswith the second conductive layer.

10. Liquid heating device according to claim 1, wherein the polymer layer is a PTC resistor.

11. Method for producing a liquid heating device according to claim 1, wherein a polymer layer which contains a polymer component and a conductive carbon component is arranged between a first conductive layer and a second conductive layer wherein liquid channels are provided for conducting the liquid to be heated which extend from a first side of the polymer layer facing the first conductive layer to a second side of the polymer layer facing the second conductive layer.

12. Method according to claim 11, wherein the polymer layer is applied in paste form to the first and/or second conductive layer.

13. Method according to claim 11, wherein openings for the liquid channels are introduced by laser cutting and/or stamping and/or produced using an extrusion and/or injection-moulding process.

14. Method for operating a liquid heating device according to claim 1, wherein liquid flows through the liquid channels and is thereby heated.

15. (canceled)

16. Liquid heating device according to claim 3, wherein the pipe is an aluminium pipe.

17. Liquid heating device according to claim 4, wherein the plate is a metal plate, and/or a metal grid, and/or a metal strip.

18. Liquid heating device according to claim 4, wherein the plate has a thickness of at least 1.0 mm and/or at most 3.0 mm.

19. Liquid heating device according to claim 1, wherein the polymer layer is preferably in contact via at least 80% of its side facing the first conductive layerwithout taking into account fuel channel openingswith the first conductive layer and/or via at least 80% of its side facing the second conductive layerwithout taking into account fuel channel openingswith the second conductive layer.

20. Liquid heating device according to claim 1, wherein the liquid is water.

21. Liquid according to claim 8, wherein the second polymer partial component is based on polyethylene and/or polypropylene.

Description

[0044] The disclosure is described below with the help of an exemplary embodiment which is explained in greater detail with the help of the figures. In the figures:

[0045] FIG. 1 shows a schematic oblique view of an electrical water heating device according to the disclosure.

[0046] In the following description, the same reference numbers are used for the same parts and parts which act in the same way.

[0047] FIG. 1 shows a schematic oblique view of an electrical water heating device according to the disclosure. This water heating device has a first conductive layer (metal layer) 10, a second conductive layer (metal layer) 11 and a polymer layer 12 (arranged therebetween). The first and second conductive layers (metal layers) are connected to electrical contacts 15a, 15b. Liquid channels 13 allow water to be conducted from a surface of the first conductive layer (metal layer) 10 facing the polymer layer 12 to a surface of the second conductive layer (metal layer) facing away from the polymer layer 12. The polymer layer is a polymer-based heating element having a carbon fraction. The polymer layer has PTC performance characteristics. An arrow 14 indicates the flow direction of the water.

[0048] The electrical heating element may have a housing 18 (preferably made of aluminium or an aluminium alloy).

[0049] Reference is made at this point to the fact that all the parts described above, taken alone and in any combination, in particular the details shown in the drawings, are claimed as essential to the disclosure. Modifications to these will be familiar to the person skilled in the art.

LIST OF REFERENCE NUMBERS

[0050] 10 first conductive layer (metal layer) [0051] 11 second conductive layer (metal layer) [0052] 12 polymer layer [0053] 13 liquid channel [0054] 14 arrow [0055] 15a contact [0056] 15b contact [0057] 18 housing