Electric heating device for mobile applications

Patent metadata

Field	Value
Publication number	US-10314114-B2
Application number	US-201615577452-A
Country	US
Kind code	B2
Filing date	May 29, 2016
Priority date	May 30, 2015
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

An electric heating device includes a substrate and a heat conductor layer formed on the substrate. The heat conductor track includes a plurality of track sections which run adjacently to one another and are separated from one another by insulating interruptions. At least one reversal point is provided at which the heat conductor track is deflected such that inner track sections with opposite flow directions run adjacently and parallel to one another. The spacing between the adjacent inner track sections is locally expanded in the region of the reversal point where the inner track sections protrude outwards to outer track sections, and the width of the track sections is locally reduced in front of and in the outer track sections to compensate for the local expansion on the inner face between the inner track sections and for the protrusion of the inner track sections.

First claim

The invention claimed is:

1. An electric heating device for mobile applications, having:
a substrate and
a heating conductor layer that is formed on the substrate,
wherein the heating conductor layer comprises at least one heating conductor track that extends in a main plane on the substrate,
wherein the heating conductor track is structured in such a manner that a multiplicity of track sections are formed that extend adjacent to one another and are separated from one another by insulating gaps and
at least one reversal site is provided at which the heating conductor track is deflected in such a manner that inner-lying track sections through which current is flowing in opposite directions with respect to one another extend in an adjacent and parallel manner with respect to one another,
wherein the spacing between the adjacent inner-lying track sections through which current is flowing in opposite directions with respect to one another is locally widened on the inner side in the region of the reversal site,
characterized in that
in the region of the reversal site, the inner-lying track sections protrude outwards towards track sections that lie further outwards and are separated by insulating gaps from the inner-lying track sections and in the case of the track sections that lie further outwards the width of the track sections is locally reduced only in the region of the reversal site in order to compensate the local widening on the inner side between the inner-lying track sections and the protrusion of the inner-lying track sections.

2. The electric heating device as claimed in claim 1 , wherein the at least one heating conductor track extends in a bifilar pattern on the substrate.

3. The electric heating device as claimed in claim 1 , wherein the heating conductor track comprises two reversal sites.

4. The electric heating device as claimed in claim 1 , wherein the heating conductor layer is structured in at least two heating conductor tracks that are formed in a butterfly-like pattern on the substrate.

5. The electric heating device as claimed in claim 1 , wherein the heating conductor layer is a layer that is deposited in a planar manner on the substrate and subsequently structured by removing material.

6. The electric heating device as claimed in claim 1 , wherein the electric heating device is configured as a high voltage heater for an operating voltage in the region between 150 V and 900 V.

7. The electric heating device as claimed in claim 1 , wherein the heating conductor layer covers at least 80% of the substrate surface area.

8. The electric heating device as claimed in claim 1 , wherein the insulating gaps have an essentially constant width over their entire length.

9. The electric heating device as claimed in claim 1 , wherein an electrically insulating material is arranged in the insulating gaps.

10. The electric heating device as claimed in claim 1 , wherein the heating conductor track is configured in such a manner that in each case two track sections through which current is flowing in the same direction extend in an adjacent and parallel manner with respect to one another at least over a major portion of its length.

11. The electric heating device as claimed in claim 1 , wherein at least one further layer is provided on the heating conductor layer.

12. The electric heating device as claimed in claim 1 , wherein the electric heating device is a motor vehicle heater.

13. The electric heating device as claimed in claim 1 , wherein the heating conductor track is configured in the reversal site in such a manner that in a region of an inner curve it is thinner in a perpendicular to the main plane than in a region of an outer curve.

14. The electric heating device as claimed in claim 13 , wherein the heating conductor track is structured in the reversal site in such a manner that the thickness increases in steps from the inner curve towards the outer curve.

15. The electric heating device as claimed in claim 13 , wherein a thickness of the heating conductor track in the region of the inner curve is a maximum 65% of the thickness of the heating conductor track in the region of the outer curve.

16. The electric heating device as claimed in claim 1 , wherein the electric heating device is configured as a high voltage heater for an operating voltage in the region between 200 V and 600 V.

17. The electric heating device as claimed in claim 1 , wherein the heating conductor layer covers at least 85% of the substrate surface area.

18. The electric heating device as claimed in claim 13 , wherein a thickness of the heating conductor track in the region of the inner curve is a maximum 50% of the thickness of the heating conductor track in the region of the outer curve.

19. The electric heating device as claimed in claim 13 , wherein a thickness of the heating conductor track in the region of the inner curve is a maximum 30% of the thickness of the heating conductor track in the region of the outer curve.

Assignees

• Webasto SE

Inventors

• Klinkmüller Tino
• Buckl Stephan
• Eckert Daniel
• Hainzlmaier Christian

Classifications

• H05B3/262 Primary

  the insulating base being an insulated metal plate · CPC title

• H05B2203/013

  Heaters using resistive films or coatings · CPC title

• H05B2203/021

  Heaters specially adapted for heating liquids · CPC title

• H05B3/265

  the insulating base being an inorganic material, e.g. ceramic (H05B3/262 takes precedence) · CPC title

• H05B2203/023

  Heaters of the type used for electrically heating the air blown in a vehicle compartment by the vehicle heating system · CPC title