EP3861831A1 - Élément chauffant plat réduisant les champs magnétiques pour un véhicule à moteur - Google Patents

Élément chauffant plat réduisant les champs magnétiques pour un véhicule à moteur

Info

Publication number
EP3861831A1
EP3861831A1 EP19794084.4A EP19794084A EP3861831A1 EP 3861831 A1 EP3861831 A1 EP 3861831A1 EP 19794084 A EP19794084 A EP 19794084A EP 3861831 A1 EP3861831 A1 EP 3861831A1
Authority
EP
European Patent Office
Prior art keywords
heating conductor
heating
magnetic field
conductor
reducing surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19794084.4A
Other languages
German (de)
English (en)
Inventor
Jochen Michelmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Bauerhin GmbH
Original Assignee
IG Bauerhin GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE202018004633.7U external-priority patent/DE202018004633U1/de
Priority claimed from DE102018007753.6A external-priority patent/DE102018007753A1/de
Application filed by IG Bauerhin GmbH filed Critical IG Bauerhin GmbH
Publication of EP3861831A1 publication Critical patent/EP3861831A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/004—Heaters using a particular layout for the resistive material or resistive elements using zigzag layout
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/029—Heaters specially adapted for seat warmers

Definitions

  • the present invention relates to a magnetic field-reducing surface heating element for a motor vehicle and a method for producing a magnetic field-reducing surface heating element.
  • Surface heating elements are used for even and effective heating of surfaces.
  • Surface heating elements are used in motor vehicles in particular as seat heaters in order to increase driving comfort for a vehicle occupant and to impart a pleasant driving experience to the latter, for example, at low outside temperatures.
  • the requirements of vehicle manufacturers for the design of surface heating elements are constantly growing.
  • the 1994 ICNIRP directive requires compliance with limit values that can be caused by exposure to time-varying electrical, magnetic and electromagnetic fields (up to 300 GHz).
  • DE 296 10 436 U1 describes, for example, a magnetic field-free heating pad which has two conductor parts through which current flows in opposite or opposite directions to reduce the magnetic field, either in series or in parallel.
  • the heating conductor comprises a relief strand on which the metallic conductor is arranged on the relief strand in a meandering manner - in particular spirally wrapping around the relief strand.
  • the metallic conductor itself has a plurality of conductor strands, in particular connected in parallel to one another, which are electrically insulated from one another.
  • EP 1 705 957 B1 discloses an electrical heating conductor with at least one electrically conductive inner strand formed from filaments and at least one electrically conductive outer strand wound around the inner strand and likewise consisting of filaments.
  • the inner strand is at least partially insulated from the outer strand. The insulation takes place by means of a lacquer layer at least partially surrounding the filaments of the outer strand.
  • DE 10 2012 219 578 B4 further discloses a fiber-laying machine for simultaneously laying and sewing at least two fiber strands, in particular ribbon-shaped fiber strands, onto a flat carrier material.
  • the fiber strands are fed for each fiber strand via a separate guide tube, each of which ends at a feed device.
  • the present invention is based on the object of creating a magnetic field-reducing surface heating element for heating a vehicle seat which is improved compared to the known prior art, and a corresponding method for its production.
  • the magnetic field-reducing surface heating element according to the present invention can be used in particular in a motor vehicle and comprises at least one heating conductor strand.
  • the at least one heating conductor strand comprises at least one first heating conductor, each with at least three filaments, each of which is insulated from one another by means of an enveloping lacquer layer and wound spirally around a core.
  • the first heating conductor further comprises an outer jacket.
  • the heating conductor strand further comprises a covering, at least in sections, on the jacket of the first heating conductor. stirring second heating conductor, which apart from a layer of lacquer around at least one filament is free of insulation.
  • the second heating conductor has no insulating sheathing, that is to say no insulation that surrounds the filaments together.
  • Such a configuration allows the heating conductor strand to be made thin, as a result of which the resulting surface heating element can be made flatter overall.
  • less material is required due to the omission of a sheathing, as a result of which the manufacturing process of the heating conductor strand can be carried out overall more cost-effectively and more quickly.
  • the second jacket-free heating conductor is insulated by the second heating conductor contacting the insulating jacket of the first heating conductor at least in sections.
  • the second heating conductor is expediently free of a core.
  • the filaments of the second heating conductor are then preferably twisted together.
  • the second heating conductor also comprises a core.
  • the filaments of the second heating conductor are expediently also wound spirally around the core.
  • a plurality of the filaments - optionally each filament - of the second heating conductor is provided with a lacquer layer enveloping them.
  • a common outer sheathing of the filaments of the second heating conductor is also not necessary in this case.
  • At least one filament of the second heating conductor is particularly preferably designed as a core / sheath wire.
  • the jacket of the at least one filament of the second heating conductor is preferably formed from copper or a copper alloy.
  • the core of the at least one filament of the second heating conductor is preferably formed from a steel, in particular from a carbon-containing steel.
  • An alternative possibility provides in the context of the invention that the jacket of the at least one filament of the second heating conductor is made of a steel, in particular one carbon-containing steel and the core of the at least one filament of the second heating conductor is formed from copper or a copper alloy.
  • the first heat conductor and the second heat conductor of the heat conductor strand can preferably be energized in opposite directions. If both heating conductors are energized in opposite directions with the same amount of current, the magnetic fields generated by the current flows are extinguished and, ideally, a magnetic field strength of (almost) zero results. In this way, the requirement for predetermined low limit values is taken into account.
  • the two heating conductors can be energized in opposite directions with, for example, 12 V direct current.
  • first heating conductor and the second heating conductor can be energized separately from one another.
  • the heating conductors are therefore energized in parallel to one another via two connection points per heating conductor.
  • the first heating conductor and the second heating conductor are preferably connected in series and, for this purpose, electrically connected to one another at one of their ends.
  • An alternative embodiment further provides that the filaments of the first heating conductor are wound in the opposite direction around its core.
  • the filaments form a double helix-like structure surrounding the core, which increases the tensile strength and the stability of the heating conductor.
  • the second heating conductor is also formed with a core, it is advantageous if the filaments of the second heating conductor are also wound in a spiral in opposite directions around its core.
  • the first heating conductor and the second heating conductor are preferably twisted or stranded with one another to form the heating conductor strand. In this way, a so-called ' twisted pair ' heating conductor strand is formed, by means of which influences from external fields largely cancel each other out.
  • the first heating conductor and the second heating conductor are expediently twisted in opposite directions.
  • the core of the first heating conductor is preferably formed from non-conductive multifilament fibers. By using a core made of multifilaments, the tensile strength of the heating conductor is increased in particular. Accordingly, a high tensile strength filament bundle is preferably used as the core. If the second heat conductor also has a core, it is preferred if this core is also formed from non-conductive multifilament fibers.
  • the heating conductor strand formed by the first heating conductor and the second heating conductor is expediently arranged on a carrier material.
  • Flexible materials such as textiles, knitted fabrics or woven fabrics are particularly suitable as carrier materials.
  • a nonwoven is particularly preferably used as the carrier material.
  • the at least one heating conductor strand is preferably sewn or embroidered onto the carrier material. Another advantage is that the at least one heating conductor strand is arranged between two layers of a carrier material.
  • the heating conductor strand formed by the first heating conductor and the second heating conductor expediently spans a heating surface on the carrier material in a meandering or undulating manner. In this way, uniform surface heating is achieved and at the same time the mechanical stresses in the event of expansion of the surface heating element in the transverse and longitudinal directions, as occur, for example, in the case of a surface heating element installed in the vehicle as seat heating, are kept low.
  • the method according to the invention serves to produce a magnetic field-reducing surface heating element for a motor vehicle.
  • a carrier material is presented and at least two heating conductors forming a heating conductor strand are attached to this carrier material, touching their path in the same direction.
  • the at least two heating conductors are fed to the carrier material from a common receiving device.
  • the holding device thus represents a common presentation or retention device for both heating conductors to be arranged on the carrier material.
  • the heating conductors are fed to the carrier material from this receiving device jointly and in particular simultaneously.
  • a supply spool is preferably used as the receiving device, on which the heating conductors are rolled up or wound up.
  • the at least two heating conductors are preferably twisted together before being applied to the carrier material.
  • the two heating conductors are already twisted together on the receiving device to form a heating conductor strand.
  • a heating conductor strand consisting of two twisted heating conductors is preferably provided by the receiving device.
  • the two heating conductor strands are only twisted together after the removal or provision by the common receiving device, with the heating conductor strand being formed.
  • the two heating conductors are preferably arranged next to one another on a rotating receiving device, that is to say, for example, on a one-part or a multi-part supply spool and are unwound together from this.
  • the rotation of the holding device during the unwinding of the heating conductors causes them to be twisted together before being applied to the carrier material.
  • the two heating conductors are expediently fastened to the carrier material by a thread guided in a zigzag stitch.
  • FIG. 1 shows a top view of a magnetic field-reducing surface heating element according to the invention with a heating conductor strand applied to a carrier material
  • FIG. 2 shows a cross section through the heating conductor strand according to FIG. 1,
  • Figure 2.1 shows a cross section through a further heat conductor strand
  • FIG. 3 shows a schematic illustration of a device for producing the magnetic field-reducing surface heating element according to FIG. 1.
  • FIG. 1 shows a top view of a magnetic field-reducing surface heating element 1 according to the invention in a schematic illustration.
  • the surface heating element 1 comprises a fleece 2 as the carrier material 3, on which a heating conductor strand 4 is applied in a wave shape. As a result, the heating conductor strand 4 spans a heating surface 5.
  • the heating conductor strand 4 is formed from two heating conductors 7, 8, which are twisted together. According to the present illustration, the heating conductors 7, 8 are acted upon separately in opposite directions, for example with 12 V direct current. The heating conductors 7, 8 are thus energized in parallel with one another via two contact points 9, 10 (indicated by dashed arrows) per heating conductor 7, 8. The opposite energization of the heating conductors 7, 8 with currents of the same amount creates a surface heating element 1, the resulting magnetic field of which is below specified limit values and thus does not represent a health hazard for the user.
  • both heating conductors 7, 8 each comprise three conductive filaments 11.
  • the filaments 11 of the first heating conductor 7 are arranged in a spiral around a high-tensile core 12 made of non-conductive multifilaments 13.
  • the second heating conductor 8 has no core in the present case.
  • the filaments 11 of the second heating conductor 8 are twisted here. The spiral winding of the filaments 11 around the core 12 of the first heating conductor 7 and the twisting of the filaments 11 of the second heating conductor 8 cannot be seen on the basis of the sectional illustration.
  • the filaments 11 of the first heating conductor 7 are each provided with an enveloping lacquer layer 14 and thereby insulated from one another.
  • the first heating conductor 7 comprises an outer jacket 15 made of an insulating material 16, which coats all the filaments 11 wound around the core 12 together.
  • the second heating conductor 8 has only one filament 11 provided with an enveloping lacquer layer 14. The two remaining filaments 11 are free of a lacquer layer 14.
  • the second heating conductor 8 also has no jacket insulation 15 surrounding the filaments 11. Instead, the second jacket-free heating conductor 8 is insulated by the second heating conductor 8 touching the jacket 15 of the first heating conductor 7 at least in sections. This is achieved in particular by twisting the two heating conductors 7,8 ( ' twisted pair ' heating conductor strand) forming the heating conductor strand 4.
  • FIG. 2.1 An alternative embodiment of the heating conductor 4 with the two heating conductor strands 7, 8 can be seen in FIG. 2.1.
  • the second heating conductor 8 here also comprises a high-tensile core 12 made of non-conductive multifilaments 13, around which the filaments 11 of the second heating conductor 8 are wound in a spiral.
  • the remaining structure of the heating conductors 7, 8 can be transferred from FIG. 2 to the heating conductors 7, 8 shown in FIG. 2.1.
  • FIG. 3 shows a partial area of an embroidery device 17 for producing a magnetic field-reducing heating element 1 by means of the method according to the invention.
  • the carrier material 3 is presented and then the heating conductor 7,
  • the two heating conductors 7, 8 are received in the form of the already twisted heating conductor strand 4 by a common receiving device 18.
  • the receiving device 18 is designed here as a one-piece supply spool 19, on which the twisted heat conductor strand 4 is wound.
  • the heating conductor strand 4 is placed on the carrier material 3 by means of a feed 20 arranged on the supply spool 19, in the present case in the form of a tube, and is attached to the base material 3 and then with a seam 23 in a zigzag stitch the carrier material 3 is embroidered.
  • the receiving device 18 represents a common presentation or retention device for the respective heating conductors.

Abstract

L'invention concerne un élément chauffant plat (1) réduisant les champs magnétiques pour un véhicule à moteur. L'élément est pourvu d'au moins une ligne (4) de conducteurs chauffants, qui comprend au moins un premier conducteur chauffant (7) pourvu d'au moins trois filaments (11 ), qui sont isolés les uns des autres respectivement au moyen d'une couche de vernis (14) enveloppante et enroulés en forme de spirale autour d'un noyau (12), le premier conducteur chauffant (7) comprenant une gaine extérieure (15). L'invention est caractérisée en ce que la ligne (4) de conducteurs chauffants comprend un deuxième conducteur chauffant (8) qui touche au moins en partie la gaine extérieure (15) du premier conducteur chauffant (7) et qui, à part une couche de vernis (14) autour d'au moins un filament (11), ne comporte pas d'isolation.
EP19794084.4A 2018-10-02 2019-09-19 Élément chauffant plat réduisant les champs magnétiques pour un véhicule à moteur Pending EP3861831A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE202018004633.7U DE202018004633U1 (de) 2018-10-02 2018-10-02 Magnetfeldreduzierendes Flächenheizelement für ein Kraftfahrzeug
DE102018007753.6A DE102018007753A1 (de) 2018-10-02 2018-10-02 Magnetfeldreduzierendes Flächenheizelement für ein Kraftfahrzeug
PCT/DE2019/000243 WO2020069687A1 (fr) 2018-10-02 2019-09-19 Élément chauffant plat réduisant les champs magnétiques pour un véhicule à moteur

Publications (1)

Publication Number Publication Date
EP3861831A1 true EP3861831A1 (fr) 2021-08-11

Family

ID=68342427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19794084.4A Pending EP3861831A1 (fr) 2018-10-02 2019-09-19 Élément chauffant plat réduisant les champs magnétiques pour un véhicule à moteur

Country Status (3)

Country Link
EP (1) EP3861831A1 (fr)
DE (1) DE112019005000A5 (fr)
WO (1) WO2020069687A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29610436U1 (de) 1996-06-14 1996-11-07 Koenig Roland Magnetfeldfreies Heizkissen (Heizdecke)
SE516018C2 (sv) * 2000-02-11 2001-11-12 Kongsberg Automotive Ab Anordning och värmeelement för uppvärmning av en komponent i fordonsmiljö
DE10309207A1 (de) 2002-08-08 2004-02-26 W.E.T. Automotive Systems Ag Heizleiter mit Ummantelung
EP1705957B1 (fr) 2005-03-21 2011-08-10 W.E.T. Automotive Systems Ag Conducteur chauffant électrique
US20080251511A1 (en) * 2007-04-10 2008-10-16 Myoung Jun Lee Apparatus for heating vehicle seat
DE102007019891A1 (de) * 2007-04-27 2008-11-06 Conti Temic Microelectronic Gmbh Heizvorrichtung und Verfahren zum Beheizen einer Vorrichtung, insbesondere einer Sitzheizung oder einer Lenkradheizung eines Fahrzeugs
DE102009010417A1 (de) * 2008-03-04 2009-09-10 König & Hohmann & Otto Lübeck GmbH & Co. KG Verfahren zur Herstellung mehrerer Sitzheizkissen
DE102012219578B4 (de) 2012-10-25 2016-09-15 DIGEL STICKTECH GmbH & Co. KG Faserlegemaschine zum gleichzeitigen Verlegen und Vernähen mehrerer Faserstränge

Also Published As

Publication number Publication date
DE112019005000A5 (de) 2021-09-02
WO2020069687A1 (fr) 2020-04-09

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