Heating device

Patent metadata

Field	Value
Publication number	US-9345071-B2
Application number	US-201313939594-A
Country	US
Kind code	B2
Filing date	Jul 11, 2013
Priority date	Jul 11, 2012
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

An electrically operated heating device, in particular for a heating or air conditioning system of a vehicle, is provided, comprising a heating register with a layered heating element, for converting electrical energy into heat, and two electrically insulating and heat-conducting insulating layers, which respectively make contact, at least in certain regions, with one side of the layered heating element. The insulating layers and the layered heating element are braced with one another, an abrasion-counteracting sliding layer being arranged between at least one of the insulating layers and the layered heating element. Alternatively or in addition, at least one of the insulating layers and the layered heating element have, at least in the region of their mutual contact surfaces, a material pairing with which the abrasion of the contact surfaces goes below a predetermined limit value.

First claim

The invention claimed is:

1. An electrically operated heating device comprising:
a heating register,
a layered heating element, for converting electrical energy into heat, and
at least one electrically insulating and heat-conducting insulating layer, which makes contact, at least in certain regions, with one side of the layered heating element, the insulating layer and the layered heating element being braced with one another,
wherein at least one abrasion-counteracting sliding layer is arranged between at least one insulating layer and the layered heating element or wherein at least one insulating layer and the layered heating element have, at least in the region of their mutual contact surfaces, a material pairing with which the abrasion of the contact surfaces goes below a predetermined limit value,
wherein the at least one sliding layer or the material pairing has a thickness of less than 20 μm and is formed from a material consisting essentially of silicone or polyester lacquer with boron nitrite as a lubricant or from a polymer that is filled with heat conductive particles.

2. The electrically operated heating device according to claim 1 ,
wherein the heating register comprises an outer layer, which at least partially surrounds the arrangement formed by the insulating layer or the insulating layers and the layered heating element, contact being made by the outer layer, at least in certain regions, with the surfaces of the insulating layer that are facing away from the heating element, and the outer layer being braced with the insulating layer and the heating element and being formed as a tube wall of an enveloping, preferably compressed tube or as an extrusion profile.

3. The electrically operated heating device according to claim 1 ,
wherein the layered heating element is a PTC layer, which is provided with at least one electrically conducting contact layer, and comprises two layered contact electrodes, which respectively make contact, at least in certain regions, with a surface of the PTC layer, or in that the layered heating element comprises at least one thick-film heating element applied to a supporting layer.

4. The electrically operated heating device according to claim 3 ,
wherein the at least one abrasion-counteracting sliding layer is arranged between at least one of the contact electrodes and the PTC layer or between at least one of the insulating layers and the outer layer or wherein at least one of the contact electrodes and the PTC layer or at least one insulating layer and the outer layer have, at least in the region of their mutual contact surfaces, a material pairing with which the abrasion of the contact surfaces goes below a predetermined limit value.

5. The electrically operated heating device according to claim 1 ,
wherein the outer layer is formed from aluminum or at least one of the insulating layers is formed with an insulating ceramic or the PTC layer is formed from PTC ceramic or the contact layer of the PTC layer is formed from gold or silver or at least one contact electrode is formed from aluminum.

6. The electrically operated heating device according to claim 1 ,
wherein at least one contact electrode is adhesively bonded at its contact surfaces to the PTC layer.

7. The electrically operated heating device according to claim 1 ,
wherein at least one of the at least one sliding layer that is arranged between two contacting layers is formed as a coating of a contact surface of one of the two contacting layers or as a separate layer.

8. The electrically operated heating device according to claim 1 ,
wherein at least one of the at least one sliding layer that is arranged between two of the contacting layers is realized by the introduction of a lubricant, such as for example oil or grease, between the at least two contacting layers or is formed from a material impregnated with a lubricant, such as for example a paper impregnated in oil.

9. The electrically operated heating device according to claim 1 ,
wherein at least two of the contacting layers have, at least in the region of their mutual contact surfaces, a material pairing of brass and aluminum or of brass and tin.

Assignees

• Behr Gmbh & Co Kg
• Behr France Rouffach Sas
• Mahle Int Gmbh

Inventors

• Kästle Christoph
• Kohl Michael
• Englert Peter
• Krumbach Karl-Gerd
• Brun Michel
• Stoeckel Jerome

Classifications

• F24H3/0429

  For vehicles · CPC title

• H05B3/24 Primary

  heating conductor being self-supporting · 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

• H05B3/44 Primary

  heating conductor arranged within rods or tubes of insulating material · CPC title

• H05B2203/02

  Heaters using heating elements having a positive temperature coefficient · CPC title