DE10055141C5 - heating conductor - Google Patents

Abstract

Use of a heat conductor for heating elements of a motor vehicle seat, wherein the heating element consists of almost in a strand mutually twisted running, touching individual conductors of conductive material, wherein at least one individual conductor is electrically isolated by insulation from all other individual conductors and the insulation of polyurethane exists, as well as the individual conductors are connected to each other at their ends by tin.

Description

The The invention relates to the use of a heating conductor for heating elements a car seat.

DE 18 91 074 U discloses a heating conductor, which consists essentially of almost in a strand running to each other, touching individual conductors of conductive material, wherein at least one individual conductor is electrically isolated from all other individual conductors by an insulation.

In DE 17 98 802 U For example, an electrical heating cable is disclosed which has an aluminum jacket while the conductors are surrounded with silicone rubber and a semiconductor is used as the heat-conducting and insulating intermediate layer.

In EP 0 930 804 A2 an electrical cable is presented which comprises at least one insulated conductor wire and at least one earth conductor, wherein these are arranged within an outer common layer.

DE 41 24 684 A1 shows a surface heating element, which consists of substantially parallel heating wires, which are electrically connected at their ends and / or deflection with power supply conductors, each power supply conductor is designed as a flexible Kontaktierungsleiste with multiple individual conductors, which are electrically connected in parallel with the heating wires, and the surface heating element is integrated in an elastic carrier material.

DE 41 42 774 A1 discloses a Flächenheizelement consisting of substantially parallel heating wires which are electrically connected at their ends and / or deflection with power supply conductors and which are embedded in a predominantly textile base material, wherein the heating conductors run as weft threads sinusoidally over the mesh threads of a knitted base material and at least are integrated into the meshes of the textile base material at the maxima of the amplitudes, wherein the power supply conductor as a contact strip at the opposite repeat edges at right angles. are arranged to the sine axis and each heating element is electrically connected to each contact conductor.

DE 43 12 622 A1 shows a surface heating element based on multifilaments as arranged on a support electrical conductor, wherein the conductor consists of steel multifilaments.

In DE 35 44 499 is a Heizleiterverbindung between separated by a provided in the upholstery core Abspanngraben, electrically heated seat or backrest surfaces disclosed below the Abspanngrabens a bounded in the cushion core tension wire, which is exposed in sections by window-like recesses in Abspanngraben, and further provided also in Abspanngraben connection seam of Covering an apron formed by a Einsteckschlaufe, which includes a further tension wire includes, is provided for seat heating of vehicles, wherein between the heated surfaces connecting webs of copper strip are provided, and the copper strip consists of a woven or knitted fabric, and on the so formed copper band, the connecting Heizleiterabschnitt meandering or wavy laid, is applied.

DE 40 20 580 A1 an electric surface heating element of net-like knitted fabric, presented with heat conductors and connected to the ends of the heating conductor contact conductors, the heating conductors are so substantially integrated parallel to each other at intervals in the mesh composite textile knitwear so tight that they run loop, wave or meandering , And the contact conductors are substantially perpendicular to the heating conductors and the textile yarn zufaufend or by partial or complete replacement of the textile base material are involved in several directly juxtaposed courses in the knitted fabric.

To the Heating of seats especially in passenger cars are mainly tinned or used silvered copper conductor. These heating conductors show despite of these coatings in dependence from the environmental conditions caused by corrosion Moisture and salt influence induced become. Because of these corrosion phenomena it comes to the Heat conductor damaging Quex cut reductions, hence to local overheating and eventually too a breakage of the heat conductor, resulting in a shortened service life of the heat conductor results. Furthermore, the coating with silver or tin or other metals, the friction of the individual filaments of the heat conductor raise each other so far that the Heating conductor due to its increased Bend stiffness and thus can be severely damaged. Another disadvantage a metallic coating of the individual Heizleiterfilamente lies in the very different redox potential of the coating metals across from the actual wire material. In the event that the coating is not free of pores and defects are present, sets Influence of one Water and salt formed electrolytes corrosion and thus the resolution of the less noble metal, which in turn damages the Heat conductor represents.

From the above, the problem arises, with the help of a novel heat conductor, the above at least partially eliminate the disadvantages mentioned. In particular, the resulting problem is to provide use of a heating element for heating elements of a motor vehicle seat, which is resistant to corrosion phenomena occurring in seats and has high mechanical flexibility.

This Problem is inventively a use of a heat conductor according to claim 1 solved.

Of the used according to the invention Heating conductor consists of almost in a strand to each other twisted running, touching individual leaders made of conductive Material, wherein at least a single conductor by an insulation is electrically isolated from all other individual conductors. It exists Polyurethane insulation, because it provides a flexible, highly insulating and mechanically highly stressable layer produced becomes. The individual conductors are connected at their ends with tin.

First is advantageous if the individual conductors are monofilament, since by this Type of embodiment one Furthermore, it is advantageous that everyone Single conductor by an isolation from all other single conductors is electrically isolated to maximum in this way Provide corrosion resistance and local destruction of the Single conductor an undesirable temperature increase to avoid at the respective break point.

Furthermore it is an advantage that the individual conductors at its longitudinal axis Ends are electrically conductively connected, for example, with a voltage source or the actual heating elements of a seat heater connected to be able to an easily accessible Contacting possibility too to have. This is achieved in that the thermal decomposition point the insulation is chosen that the Single conductor at their ends in a bath of liquid tin from the insulation freed and connected by the tin.

advantageously, the insulation consists of several layers, as a result dense and yet flexible isolation can be created.

The Isolation continues to advantageously consist of an inner Layer of polyurethane and at least one outer layer of polyester or Polyacrylate, since polyurethane itself absorbs water and moisture can and the outer layer on polyester or polyacrylate the direct contact of the individual conductors prevented with water. In this way, there is a very effective one Protection from water.

Farther It is advantageous if the individual conductors made of copper or conductive plastic exist, since these materials have been proven in practice. As a conductive Plastics are particularly strong with carbon (carbon black, carbon) staggered plastics proven, because at low line voltages, a high conductivity must be ensured.

Furthermore it is advantageous that at least a single conductor consists of a material which is its electrical Resistance in dependence the temperature changes, because such a single conductor can act as a temperature sensor. When Material have proven themselves nickel, iron or alloys, the have a high temperature coefficient and so a large output signal in the form of a resistance change produce.

Finally is It is advantageous if all individual conductors from an outer insulation shell made of FEP (Tetrafluoroethylene-hexafluoropropylene), silicone (meaning here the usual used silicone resins) or PTFE (polytetrafluoroethylene) sheathed are to provide a further mechanical as well as electrical protection of the Heat conductor to ensure.

One a heat conductor used in the invention containing knitted fabric has the above-mentioned advantageous properties on, where it is to be regarded as particularly positive when the heating conductor in partial or short shot (under These designations are those customary in the field of active technology Terms with their corresponding semantic content meant) in the knitted fabric is incorporated, since in this way the heating conductor is integrated into a textile environment that absorbs external forces and the heating conductor protects against high tensile forces. By the textile integration in the partial or short shot is a wave-shaped course of the heat conductor in the textile, without causing sharp creases or high tensile stresses can occur. The knitted fabric consists in particular of a polyester, polyethylene or cotton.

One at least one used according to the invention Heating element containing heating element has the above properties on.

The The following example serves to explain the invention in more detail.

A multi-trench having car seat includes an electric seat heater of several parts, in particular individual heating elements. The individual heating elements run in the immediate vicinity along the guy trenches quasi "in the upholstery beads" of the seat. The heating surfaces are each electrically connected to each other with a heat conductor having the following features, wherein the heating element in the partial shot in a knitted fabric made of poly ester is involved.

Of the Heating conductor itself consists essentially of almost in one strand moving, touching each other Single conductors of copper, each monofilament being monofilament and by an inner layer of polyurethane and an outer layer Polyester insulation from all other single conductors is electrically isolated. The individual conductors are at their longitudinal axis Ends over one solder electrically connected to each other. All individual leaders are from an outer insulation shell PTFE sheathed.

Claims (5)

Use of a heating conductor for heating elements a motor vehicle seat, wherein the heating conductor consists of almost in one Strand mutually twisted running, touching each other Single conductors made of conductive Material, wherein at least a single conductor by an insulation is electrically isolated from all other individual conductors and the Insulation consists of polyurethane, as well as the individual conductors are connected together at their ends by tin. Use according to claim 1, characterized that each individual leader by an isolation of all other individual leaders is electrically isolated. Use according to one of claims 1 to 2, characterized that the insulation consists of an inner layer of polyurethane and at least one outer layer made of polyester or polyacrylate. Use according to one of Claims 1 to 3, characterized that the individual conductors made of copper or conductive plastic. Use according to one of Claims 1 to 4, characterized that all Single conductor from an outer insulation shell FEP, silicone or PTFE are sheathed.