HEATING DEVICE AND ELECTRIC COOKER

• US 20200137839A1
• Filed: 10/17/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• Status: Active Grant

• Current Assignee: EGO Elektro-Gerã¤Tebau GmbH (EGO Blanc und Fischer & Company GmbH)
• Original Assignee: EGO Elektro-Gerã¤Tebau GmbH (EGO Blanc und Fischer & Company GmbH)
• Inventors: Rickert, Jochen
• Granted Patent: US 11,516,891 B2
• Time in Patent Office: Days
• CPC Class Codes: A47J 27/004 with integral electrical heating means drinking cups with integral heating means A47J36/2466
• CPC Class Codes: H05B 2203/003 using serpentine layout
• CPC Class Codes: H05B 2203/014 Heaters using resistive wires or cables not provided for in H05B3/54
• CPC Class Codes: H05B 3/265 the insulating base being an inorganic material, e.g. ceramic H05B3/262 takes precedence
• CPC Class Codes: H05B 3/56 Heating cables
• CPC Class Codes: H05B 3/64 using ribbon, rod, or wire heater
• CPC Class Codes: H05B 3/68 Heating arrangements specially adapted for cooking plates or analogous hot-plates
• CPC Class Codes: H05B 3/748 Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater H05B3/742 takes precedence

Abstract

A heating device for an electric cooktop has at least one long heating conductor, one support body on the top side of which the heating conductor is arranged and fitted, and one supporting means for the support body. The heating conductor is designed as a corrugated flat strip which has, on its bottom side, holding elements which are arranged at a distance from one another and integrally project downward and are pushed into the support body. The supporting means supports the support body, at least in its outer region along an outer edge, at the bottom. The support body consists, as a thin plate, of compressed and adhesively bonded mica material, for example micanite, and is therefore electrically insulating and sufficiently stable.

Claims

1. A heating device for an electric cooker, said heating device having:

at least one long heating conductor,

a support body with a top side, wherein said heating conductor is arranged and fitted on said top side of said support body,

a supporting means for said support body,

wherein;

said heating conductor is designed as a corrugated flat strip,

said strip has, at least on a bottom side of said strip, holding elements,

said holding elements are arranged at a distance from one another and project or protrude downward,

said holding elements are pushed into said support body,

said supporting means support said support body, at least in an outer region or along an outer edge off said support body, in downward direction,

said support body consists of compressed or adhesively bonded mica material.

2. The heating device as claimed in claim 1, wherein a coefficient of thermal expansion of said support body or of said material of said support body differs by at most 10% from that of said heating conductor.

3. The heating device as claimed in claim 2, wherein said coefficient of thermal expansion of said support body or of said material of said support body differs by at most 10% from that of said heating conductor up to a temperature of 250°

C.

4. The heating device as claimed in claim 1, wherein said mica material is micanite.

5. The heating device as claimed in claim 1, wherein said support body is designed as a plate on which said at least one heating conductor is arranged.

6. The heating device as claimed in claim 5, wherein said support body is a thin plane-parallel plate with a thickness of between 0.1 mm and 2 mm.

7. The heating device as claimed in claim 1, wherein spacers are provided above said top side of said support body in a region of said outer edge of said support body, in order to maintain a distance from a cooktop plate of a cooktop, wherein said cooktop plate is to be arranged above said support body.

8. The heating device as claimed in claim 7, wherein said spacers are provided as a substantially continuously encircling ring.

9. The heating device as claimed in claim 1, wherein said holding elements are integrally formed from said heating conductor or are integrally formed on said heating conductor.

10. The heating device as claimed in claim 9, wherein said holding elements consist of said flat strip of said heating conductor and extend downward in one piece and in one part from a bottom edge of said heating conductor.

11. The heating device as claimed in claim 1, wherein a length of said holding elements is 50% to 200% of a height of said heating conductor.

12. The heating device as claimed in claim 1, wherein a length of said holding elements lies between 1 mm and 6 mm.

13. The heating device as claimed in claim 1, wherein at least some of said holding elements are curved in a longitudinal profile in a direction away from said heating conductor.

14. The heating device as claimed in claim 1, wherein said holding elements are of tapered design in a longitudinal profile in a direction away from said heating conductor.

15. The heating device as claimed in claim 1, wherein said holding elements are of tapered design in a longitudinal profile in a direction away from said heating conductor and have a tapered free tip.

16. The heating device as claimed in claim 1, wherein a holding element has a base region, said base region adjoining a bottom edge of said heating conductor and having a length of between 0.1 mm and 2 mm in a direction transversely away from said heating conductor.

17. The heating device as claimed in claim 16, wherein said base region has a constant width.

18. The heating device as claimed in claim 16, wherein each said holding element is formed on precisely one said single base region.

19. The heating device as claimed in claim 16, wherein said holding elements have a tapered free tip adjoining said base region.

20. The heating device as claimed in claim 16, wherein said tapered tip is narrower in an upper wider region than a minimum width of said base region.

21. The heating device as claimed in claim 16, wherein said base region has a width of between 2 mm and 10 mm.

22. The heating device as claimed in claim 16, wherein said base region has a width of between 100% and 400% of a height of said heating conductor in a direction along a longitudinal direction of said heating conductor.

23. The heating device as claimed in claim 16, wherein said base region is not arranged in said support body but, respectively, runs above support body or is placed onto said support body.

24. The heating device as claimed in claim 1, wherein a power per unit area in a region of said heating conductor is at most 4 W/cm².

25. An electric cooker comprising at least one heating device as claimed in claim 1, wherein said electric cooker is designed as an electric cooktop or as an electric oven.