EP0383152A2 - Flexible electric heating apparatus - Google Patents
Flexible electric heating apparatus Download PDFInfo
- Publication number
- EP0383152A2 EP0383152A2 EP90102288A EP90102288A EP0383152A2 EP 0383152 A2 EP0383152 A2 EP 0383152A2 EP 90102288 A EP90102288 A EP 90102288A EP 90102288 A EP90102288 A EP 90102288A EP 0383152 A2 EP0383152 A2 EP 0383152A2
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- European Patent Office
- Prior art keywords
- conductor
- electric heating
- heating device
- heating
- heated
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- 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.)
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Classifications
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- 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
- H05B3/36—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heating conductor embedded in insulating material
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- 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
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- 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
- H05B2203/003—Heaters using a particular layout for the resistive material or resistive elements using serpentine layout
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- 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
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- 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
- H05B2203/026—Heaters specially adapted for floor heating
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- 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 invention relates to a flexible electric heating device with the features of the preamble of claim 1.
- Supple electric heaters are used to apply heat to the human body. They are used, for example, as heated underblankets to create comfortable temperatures in bed, even when the bedroom is not heated, but also as a warm blanket. They also serve to make lying on waterbeds comfortable by ensuring a comfortable temperature of the support surface. They continue to be used as heating pads, foot heating or for heating car seats. They can also be used as carpet heating. In the medical field, they serve as pads for examination couches and massage benches; in medical heat treatment, they can be used, for example, as neck and neck heating pads or face heating pads. They are used as relaxation aids in the form of warming mats in yoga.
- Such supple electric heating devices are known for example from DE-GM 88 06 248.
- a heating cord is guided in a meandering shape under a surface to be heated.
- the temperature which is perceived as pleasant can be set by means of a temperature preselector and is maintained by a temperature control device.
- the heating cord has an outgoing conductor and a return conductor, the resistance value of the outgoing conductor being equal to the resistance value of the return conductor.
- the forward conductor and return conductor are preferably arranged running parallel to one another, but it is also conceivable that the return conductor is wound separately over the forward conductor by an insulating layer.
- the heating cord has an insulating core on which the heating conductor (s) are wound.
- interference fields electromagnetic type can be significantly reduced.
- Another improvement is achieved by shielding purely electrical interference fields. This can be achieved, for example, by covering the surface to be heated with a film which contains metallic components.
- the film can be a textile with electrically conductive fibers, it can be designed as a wire mesh or it can also be a metal-coated carrier.
- the power supply is advantageously carried out via a so-called bio-cable, which is a shielded cable with twisted wires.
- bio-cable which is a shielded cable with twisted wires.
- it is furthermore expedient to provide a circuit breaker which quickly switches off the power supply.
- the flexible electric heating device consists of a carrier (1) made of textile material, plastic or the like, which can also serve as a covering for the heating electronics.
- a heating cord (2) is arranged on the carrier (1) or in the sheathing, which is removed from the carrier (1) via a connecting piece (3). is brought out.
- the heating cord (2) is arranged in a meandering manner on the carrier (1), so that the surface of the carrier (1) is heated as uniformly as possible.
- An electrical supply line (4) which can be connected to the electrical network via a mains plug (7), supplies the electric heating device with current.
- a temperature control device (5) with a switch (6) for preselecting the heating temperature is provided in the feed line (4).
- a shielded cable with twisted wires can be used as the supply line (4) in order to exclude the interference from the supply line as far as possible. It is also useful to provide a circuit breaker, not shown here, which quickly cuts off the power supply when electrical breakdowns occur in the electric heating device.
- the heating cord (2) has an outgoing conductor and a return conductor.
- Figure 2 shows an embodiment for the heating cord for installation in the electric heating device according to the invention.
- Forward conductor (8) and return conductor (9) are arranged parallel to one another and are enclosed by a common insulation (14).
- the insulation (14) tapers between the outgoing conductor (10) and the return conductor (11) and forms a web-shaped section, which makes it possible for the outgoing conductor (8) and return conductor (9) to be tilted slightly against one another, so that the heating cord forms a has some flexibility perpendicular to the direction of the ladder.
- Both the forward conductor (8) and the return conductor (9) have a core (10, 11) made of electrically insulating material, around which the heating conductor (12, 13) is wound.
- the heating conductor (12) for the outgoing conductor (8) from a different material than the heating conductor (13) for the return conductor (9).
- the outgoing conductor (8) or the return conductor (9) can be used as a temperature sensor, so that then for the corresponding conductor A nickel alloy is expediently used, while the other conductor can consist of a copper wire or the like.
- the resistance value of the outgoing conductor (8) is equal to the resistance value of the return conductor (9). If current flows through the heating conductors, electromagnetic fields are formed around the outgoing conductors (8) and return conductors (9), the strength of which is identical at each point in space, but the direction of which depends on the direction of the current flowing through the conductors. If the outgoing conductor (8) and return conductor (9) are guided in parallel, the electromagnetic fields between the outgoing conductor (8) and return conductor (9) cancel each other almost completely and are at least weakened in the outer area. This leads to a considerable reduction in the interference fields that occur in electrical heating devices.
- the resistance values can be matched by a suitable choice of the winding density of the heating conductors.
- FIG 3 shows a further embodiment of a heating cord.
- the outgoing conductor (16) has a core (18) made of insulating material, around which the heating conductor (21) is wound.
- the outgoing conductor (16) is enclosed by insulation (19) which at the same time forms the carrier for the return conductor (17).
- the heating conductor (22) is in turn wound on the insulation (19), the windings being less dense than in the outgoing conductor (16), in order to achieve a match of the resistance values again.
- the entire arrangement is encased by an insulating layer (20). Due to the different direction of current flow in the outgoing conductor (16) and return conductor (17), those generated by the outgoing conductor (16) and return conductor (17) interfere electromagnetic fields again in such a way that they weaken each other. Therefore, the interference field influence is reduced with this arrangement.
- FIG. 4 shows an electrical heating device according to the present invention, in which not only electromagnetic fields but also electrical fields are shielded.
- the carrier (1) is arranged on a cushion (26) made of soft insulating material.
- the carrier (1) or a suitable covering accommodates the heating cord arrangement.
- the heating cords can be constructed in accordance with the embodiments in FIGS. 2 and 3.
- a film (24) is provided over the surface (25) to be heated, which serves to shield the electrical fields. It can consist of a textile material that contains threads of electrically conductive material, which are arranged in the textile, for example in the form of a net.
- a wire mesh is also suitable.
- a good shielding effect is also achieved if the film is designed as a carrier coated with metal on one side.
- the interference fields are measured over the contact surface (23) of the electric heating device by means of a probe and compared with the values for already known electric heating devices, the interference fields are weakened by the order of magnitude of ten. It has even been found that the interference field influence is less in the area of the support surface (23) than in the spatial surroundings of the electric heating device, so that the electric heating device according to the invention even partially absorbs the background radiation that is always present in the room.
- An electrical heating device can also be used very advantageously for heating the support surface in waterbeds, in which case the flat heating element is arranged between two layers of the foil containing metallic components.
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- Resistance Heating (AREA)
Abstract
Description
Die Erfindung betrifft ein schmiegsames Elektrowärmegerät mit den Merkmalen des Oberbegriffes von Anspruch 1.The invention relates to a flexible electric heating device with the features of the preamble of
Schmiegsame Elektrowärmegeräte dienen zur Wärmeanwendung am menschlichen Körper. Sie werden beispielsweise als Wärmeunterbetten dazu benutzt, um im Bett angenehme Temperaturen zu schaffen, selbst wenn der Schlafraum nicht beheizt ist, aber auch als Wärmezudecken. Sie dienen auch dazu, das Liegen auf Wasserbetten angenehm zu machen, indem sie für eine angenehme Temperatur der Auflagefläche sorgen. Sie werden weiterhin als Heizkissen, Fußbeheizung oder zur Autositzbeheizung eingesetzt. Auch als Teppichbeheizung können sie eingesetzt werden. Im medizinischen Bereich dienen sie als Auflagen für Untersuchungsliegen und Massagebänke, bei der medizinischen Wärmebehandlung können sie beispielsweise als Hals- Nacken-Heizkissen oder Gesichtsheizkissen eingesetzt werden. Als Entspannungshilfe in Form von Wärmematten benutzt man sie beim Yoga.Supple electric heaters are used to apply heat to the human body. They are used, for example, as heated underblankets to create comfortable temperatures in bed, even when the bedroom is not heated, but also as a warm blanket. They also serve to make lying on waterbeds comfortable by ensuring a comfortable temperature of the support surface. They continue to be used as heating pads, foot heating or for heating car seats. They can also be used as carpet heating. In the medical field, they serve as pads for examination couches and massage benches; in medical heat treatment, they can be used, for example, as neck and neck heating pads or face heating pads. They are used as relaxation aids in the form of warming mats in yoga.
Solche schmiegsamen Elektrowärmegeräte sind beispielsweise aus der DE-GM 88 06 248 bekannt. Bei dem bekannten Elektrowärmegerät ist eine Heizkordel mäanderförmig unter einer zu beheizenden Fläche geführt. Mittels eines Temperaturvorwählschalters ist die als angenehm empfundene Temperatur einstellbar, sie wird durch eine Temperatursteuereinrichtung aufrechterhalten.Such supple electric heating devices are known for example from DE-GM 88 06 248. In the known electric heating device, a heating cord is guided in a meandering shape under a surface to be heated. The temperature which is perceived as pleasant can be set by means of a temperature preselector and is maintained by a temperature control device.
Erst in jüngster Zeit wurde erkannt, daß solche Elektrowärmegeräte in biologischer Hinsicht auch Nachteile haben können. Stromdurchflossene Leiter erzeugen nämlich in ihrer Umgebung Störfelder, die elektrischer oder elektromagnetischer Art sein können, wobei das elektromagnetische Feld in seiner Stärke meist dominiert. Dabei sind die Feldstärken um so höher, je größer die Leistungsaufnahme des Gerätes ist. Die Menschen reagieren sehr unterschiedlich auf diese Störfelder. Gesundheitlich labile und sensible Menschen jedoch werden oftmals von den Störfeldern spürbar negativ beeinflußt. Während der Organismus eines gesunden Menschen die Fähigkeit hat, die von den Störfeldern ausgehenden Reize auszuregulieren, trifft dies für Kranke und auch ältere Menschen nicht mehr zu. Um das Wohlbefinden dieser Menschen nicht unnötig zu beeinträchtigen, ist es daher wünschenwert, daß der Einfluß solcher Störfelder auf den menschlichen Organismus möglichst ausgeschaltet wird.Only recently has it been recognized that such electrical heating devices can also have disadvantages in biological terms. Current-carrying conductors generate in their environment Interference fields, which can be electrical or electromagnetic in nature, the strength of the electromagnetic field usually dominating. The field strengths are higher, the greater the power consumption of the device. People react very differently to these interference fields. People who are unstable and sensitive to health, however, are often noticeably negatively affected by the interference fields. While the organism of a healthy person has the ability to regulate the stimuli emanating from the interference fields, this no longer applies to the sick and the elderly. In order not to unnecessarily impair the well-being of these people, it is therefore desirable that the influence of such interference fields on the human organism be eliminated as far as possible.
Aufgabe der Erfindung ist es daher, bei schmiegsamen Elektrowärmegeräten den Einfluß bzw. die Wirkungen der von stromdurchflossenen Leitern ausgehenden Störfelder auf den menschlichen Organismus zu verringern und so weit wie möglich herabzusetzen oder sogar ganz auszuschalten.It is therefore the object of the invention to reduce the influence or the effects of the interference fields emanating from current-carrying conductors on the human organism in flexible electric heating devices and to reduce them as far as possible or even to switch them off entirely.
Diese Aufgabe wird von einem Elektrowärmegerät mit den Merkmalen des Kennzeichens von Anspruch 1 gelöst. Vorteilhafte Ausgestaltungen ergeben sich aus den Kennzeichen der Unteransprüche.This object is achieved by an electric heating device with the features of the characterizing part of
Beim erfindungsgemäßen Elektrowärmegerät weist die Heizkordel einen Hinleiter und einen Rückleiter auf, wobei der Widerstandswert des Hinleiters gleich dem Widerstandswert des Rückleiters ist.In the electric heating device according to the invention, the heating cord has an outgoing conductor and a return conductor, the resistance value of the outgoing conductor being equal to the resistance value of the return conductor.
Bevorzugt sind Hinleiter und Rückleiter parallel zueinander verlaufend angeordnet, jedoch ist es auch denkbar, daß der Rückleiter durch eine Isolierschicht getrennt über dem Hinleiter gewickelt ist.The forward conductor and return conductor are preferably arranged running parallel to one another, but it is also conceivable that the return conductor is wound separately over the forward conductor by an insulating layer.
In einer bevorzugten Ausführungsform weist die Heizkordel einen Isolierkern auf, auf den der oder die Heizleiter gewickelt sind.In a preferred embodiment, the heating cord has an insulating core on which the heating conductor (s) are wound.
Mit dem erfindungsgemäßen Elektrowärmegerät können Störfelder elektromagnetischer Art in erheblichem Umfang reduziert werden. Eine weitere Verbesserung ergibt sich, indem man auch rein elektrische Störfelder abschirmt. Dieses kann beispielsweise dadurch erreicht werden, daß die zu beheizende Fläche mit einer Folie bedeckt ist, welche metallische Anteile enthält. Die Folie kann ein Textil mit elektrisch leitenden Fasern sein, sie kann als Drahtnetz ausgebildet sein oder auch ein einseitig metallbeschichteter Träger sein.With the electric heating device according to the invention, interference fields electromagnetic type can be significantly reduced. Another improvement is achieved by shielding purely electrical interference fields. This can be achieved, for example, by covering the surface to be heated with a film which contains metallic components. The film can be a textile with electrically conductive fibers, it can be designed as a wire mesh or it can also be a metal-coated carrier.
Vorteilhaft geschieht die Stromzuleitung über ein sogenanntes Bio-Kabel, das ein abgeschirmtes Kabel mit verdrillten Adern ist. Zum Schutz des Benutzers ist es weiterhin zweckmäßig, einen die Stromzufuhr schnell abschaltenden Schutzschalter vorzusehen.The power supply is advantageously carried out via a so-called bio-cable, which is a shielded cable with twisted wires. To protect the user, it is furthermore expedient to provide a circuit breaker which quickly switches off the power supply.
Im folgenden ist die Erfindung anhand der Zeichnung, die lediglich Beispiele darstellende Ausführungsformen zeigt, näher erläutert. Es zeigt,
- Fig. 1 ein schmiegsames Elektrowärmegerät gemäß der vorliegenden Erfindung,
- Fig. 2 eine schematische Teilansicht einer Heizkordel zum Einbau in das Elektrowärmegerät,
- Fig. 3 eine schematische Teilansicht einer anderen Ausführungsform einer Heizkordel und
- Fig. 4 die Teilansicht eines Schnittes durch ein schmiegsames Elektrowärmegerät gemäß der vorliegenden Erfindung.
- 1 is a pliable electric heating device according to the present invention,
- 2 is a schematic partial view of a heating cord for installation in the electric heating device,
- Fig. 3 is a schematic partial view of another embodiment of a heating cord and
- Fig. 4 is a partial view of a section through a flexible electric heating device according to the present invention.
Das erfindungsgemäße schmiegsame Elektrowärmegerät besteht aus einem Träger (1) aus textilem Material, Kunststoff oder dergleichen, der gleichzeitig als Umhüllung für die Heizelektrik dienen kann. Auf dem Träger (1) bzw. in der Umhüllung ist eine Heizkordel (2) angeordnet, die über ein Anschlußstück (3) aus dem Träger (1) herausgeführt wird. Dabei ist die Heizkordel (2) auf dem Träger (1) mäanderförmig angeordnet, so daß eine möglichst gleichmäßige Beheizung der Fläche des Trägers (1) erfolgt. Eine elektrische Zuleitung (4), die über einen Netzstecker (7) an das elektrische Netz angeschlossen werden kann, versorgt das Elektrowärmegerät mit Strom. In der Zuleitung (4) ist eine Temperatursteuereinrichtung (5) mit einem Schalter (6) für die Vorwahl der Heiztemperatur vorgesehen. Als Zuleitung (4) kann ein abgeschirmtes Kabel mit verdrillten Adern benutzt werden, um auch die Störeinflüsse von der Zuleitung her möglichst auszuschließen. Ferner ist zweckmäßig ein hier nicht dargesteller Schutzschalter vorzusehen, der die Stromzufuhr schnell unterbricht, wenn elektrische Durchbrüche im Elektrowärmegerät auftreten.The flexible electric heating device according to the invention consists of a carrier (1) made of textile material, plastic or the like, which can also serve as a covering for the heating electronics. A heating cord (2) is arranged on the carrier (1) or in the sheathing, which is removed from the carrier (1) via a connecting piece (3). is brought out. The heating cord (2) is arranged in a meandering manner on the carrier (1), so that the surface of the carrier (1) is heated as uniformly as possible. An electrical supply line (4), which can be connected to the electrical network via a mains plug (7), supplies the electric heating device with current. A temperature control device (5) with a switch (6) for preselecting the heating temperature is provided in the feed line (4). A shielded cable with twisted wires can be used as the supply line (4) in order to exclude the interference from the supply line as far as possible. It is also useful to provide a circuit breaker, not shown here, which quickly cuts off the power supply when electrical breakdowns occur in the electric heating device.
Die Heizkordel (2) weist einen Hinleiter und einen Rückleiter auf. Figur 2 zeigt eine Ausführungsform für die Heizkordel zum Einbau in das erfindungsgemäße Elektrowärmegerät. Hinleiter (8) und Rückleiter (9) sind parallel zueinander angeordnet und werden von einer gemeinsamen Isolierung (14) umschlossen. Zwischen Hinleiter (10) und Rückleiter (11) verjüngt sich die Isolierung (14) und bildet einen stegförmigen Abschnitt, wodurch es ermöglicht wird, daß Hinleiter (8) und Rückleiter (9) in geringem Maße gegeneinander verkippbar sind, so daß die Heizkordel eine gewisse Flexibilität senkrecht zur Richtung der Leiter aufweist. Sowohl der Hinleiter (8) als auch der Rückleiter (9) weisen einen Kern (10,11) aus elektrisch isolierendem Material auf, um den jeweils der Heizleiter (12,13) gewickelt ist. Es kann vorteilhaft sein, den Heizleiter (12) für den Hinleiter (8) aus einem anderem Material zu wählen als den Heizleiter (13) für den Rückleiter (9). Beispielsweise kann entweder der Hinleiter (8) oder der Rückleiter (9) als Temperaturfühler benutzt werden, so daß für den entsprechenden Leiter dann zweckmäßig eine Nickellegierung verwendet wird, während der andere Leiter aus einem Kupferdraht oder dergleichen bestehen kann.The heating cord (2) has an outgoing conductor and a return conductor. Figure 2 shows an embodiment for the heating cord for installation in the electric heating device according to the invention. Forward conductor (8) and return conductor (9) are arranged parallel to one another and are enclosed by a common insulation (14). The insulation (14) tapers between the outgoing conductor (10) and the return conductor (11) and forms a web-shaped section, which makes it possible for the outgoing conductor (8) and return conductor (9) to be tilted slightly against one another, so that the heating cord forms a has some flexibility perpendicular to the direction of the ladder. Both the forward conductor (8) and the return conductor (9) have a core (10, 11) made of electrically insulating material, around which the heating conductor (12, 13) is wound. It may be advantageous to choose the heating conductor (12) for the outgoing conductor (8) from a different material than the heating conductor (13) for the return conductor (9). For example, either the outgoing conductor (8) or the return conductor (9) can be used as a temperature sensor, so that then for the corresponding conductor A nickel alloy is expediently used, while the other conductor can consist of a copper wire or the like.
Gemäß der Erfindung ist der Widerstandswert des Hinleiters (8) gleich dem Widerstandswert des Rückleiters (9). Werden nun die Heizleiter vom Strom durchflossen, so bilden sich um Hinleiter (8) und Rückleiter (9) elektromagnetische Felder aus, deren Stärke dem Betrage nach an jedem Raumpunkt identisch ist, deren Richtung jedoch von der Richtung des durch die Leiter hindurchfließenden Stromes abhängt. Bei parallel geführtem Hinleiter (8) und Rückleiter (9) heben sich die elektromagnetischen Felder zwischen Hinleiter (8) und Rückleiter (9) fast vollständig auf und werden im Außenbereich zumindest abgeschwächt. Dieses führt zu einer beträchtlichen Reduzierung der bei Elektrowärmegeräten auftretenden Störfelder.According to the invention, the resistance value of the outgoing conductor (8) is equal to the resistance value of the return conductor (9). If current flows through the heating conductors, electromagnetic fields are formed around the outgoing conductors (8) and return conductors (9), the strength of which is identical at each point in space, but the direction of which depends on the direction of the current flowing through the conductors. If the outgoing conductor (8) and return conductor (9) are guided in parallel, the electromagnetic fields between the outgoing conductor (8) and return conductor (9) cancel each other almost completely and are at least weakened in the outer area. This leads to a considerable reduction in the interference fields that occur in electrical heating devices.
Wenn Hinleiter (9) und Rückleiter (9) aus unterschiedlichen Materialien bestehen, kann man die Widerstandswerte durch geeignete Wahl der Windungsdichte der Heizleiter in Übereinstimmung bringen.If the outgoing conductor (9) and return conductor (9) consist of different materials, the resistance values can be matched by a suitable choice of the winding density of the heating conductors.
Figur 3 zeigt eine weitere Ausführungsform einer Heizkordel. Der Hinleiter (16) weist einen Kern (18) aus isolierendem Material auf, um den der Heizleiter (21) gewickelt ist. Der Hinleiter (16) ist von einer Isolierung (19) umschlossen, der gleichzeitig den Träger für den Rückleiter (17) bildet. Auf die Isolierung (19) ist wiederum der Heizleiter (22) gewickelt, wobei die Wicklungen weniger dicht sind als beim Hinleiter (16), um wieder eine Übereinstimmung der Widerstandswerte zu erreichen. Die gesamte Anordnung ist von einer isolierenden Schicht (20) ummantelt. Durch die unterschiedliche Stromflußrichtung im Hinleiter (16) und Rückleiter (17) interferieren die vom Hinleiter (16) bzw. Rückleiter (17) erzeugten elektromagnetischen Felder wieder in einer solchen Weise, daß sie sich gegenseitig abschwächen. Daher wird auch bei dieser Anordnung der Störfeldeinfluß reduziert.Figure 3 shows a further embodiment of a heating cord. The outgoing conductor (16) has a core (18) made of insulating material, around which the heating conductor (21) is wound. The outgoing conductor (16) is enclosed by insulation (19) which at the same time forms the carrier for the return conductor (17). The heating conductor (22) is in turn wound on the insulation (19), the windings being less dense than in the outgoing conductor (16), in order to achieve a match of the resistance values again. The entire arrangement is encased by an insulating layer (20). Due to the different direction of current flow in the outgoing conductor (16) and return conductor (17), those generated by the outgoing conductor (16) and return conductor (17) interfere electromagnetic fields again in such a way that they weaken each other. Therefore, the interference field influence is reduced with this arrangement.
Figur 4 zeigt ein Elektrowärmegerät gemäß der vorliegenden Erfindung, bei dem nicht nur elektromagnetische Felder, sondern auch elektrische Felder abgeschirmt werden. Auf einem Polster (26) aus weichem isolierenden Material ist der Träger (1) angeordnet. Der Träger (1) bzw. eine geeignete Umhüllung nimmt die Heizkordelanordnung auf. Die Heizkordeln können dabei gemäß den Ausführungsformen von Figur 2 und Figur 3 aufgebaut sein. Über der zu beheizenden Fläche (25) ist eine Folie (24) vorgesehen, die der Abschirmung der elektrischen Felder dient. Sie kann aus einem textilen Material bestehen, das Fäden aus elektrisch leitendem Material enthält, die beispielsweise in Form eines Netzes in dem Textil angeordnet sind. Geeignet ist auch ein Drahtnetz. Eine gute Abschirmwirkung wird auch erreicht, wenn die Folie als einseitig metallbeschichteter Träger ausgebildet ist. Werden über der Auflagefläche (23) des Elektrowärmegerätes nun mittels einer Sonde die Störfelder vermessen und mit den Werten für bereits bekannte Elektrowärmegeräte verglichen, so ergibt sich eine Abschwächung der Störfelder, die sich in der Größenordnung einer Zehnerpotenz bewegt. Es wurde sogar gefunden, daß im Bereich der Auflagefläche (23) der Störfeldeinfluß geringer ist als in der räumlichen Umgebung des Elektrowärmegerätes, so daß das Elektrowärmegerät gemäß der Erfindung sogar die immer vorhandene Hintergrundstrahlung des Raumes teilweise absorbiert.FIG. 4 shows an electrical heating device according to the present invention, in which not only electromagnetic fields but also electrical fields are shielded. The carrier (1) is arranged on a cushion (26) made of soft insulating material. The carrier (1) or a suitable covering accommodates the heating cord arrangement. The heating cords can be constructed in accordance with the embodiments in FIGS. 2 and 3. A film (24) is provided over the surface (25) to be heated, which serves to shield the electrical fields. It can consist of a textile material that contains threads of electrically conductive material, which are arranged in the textile, for example in the form of a net. A wire mesh is also suitable. A good shielding effect is also achieved if the film is designed as a carrier coated with metal on one side. If the interference fields are measured over the contact surface (23) of the electric heating device by means of a probe and compared with the values for already known electric heating devices, the interference fields are weakened by the order of magnitude of ten. It has even been found that the interference field influence is less in the area of the support surface (23) than in the spatial surroundings of the electric heating device, so that the electric heating device according to the invention even partially absorbs the background radiation that is always present in the room.
Sehr vorteilhaft kann ein Elektrowärmegerät gemäß der vorliegenden Erfindung auch zur Beheizung der Auflagefläche bei Wasserbetten eingesetzt werden, wobei dann der flächige Heizkörper zwischen zwei Schichten der metallische Anteile enthaltenden Folie angeordnet ist.An electrical heating device according to the present invention can also be used very advantageously for heating the support surface in waterbeds, in which case the flat heating element is arranged between two layers of the foil containing metallic components.
Obwohl die Erfindung in der Ausführungsform gemäß Figur 4 anhand eines schmiegsamen Elektrowärmegerätes beschrieben ist, das in Kombination sowohl spezielle Heizkordeln, mit denen elektromagnetische Felder abgeschirmt werden, als auch eine spezielle Abdeckung, mit der elektrische Felder abgeschirmt werden, beschrieben wurde, sei darauf hinzuweisen, daß die hier offenbarte Abdeckung auch für sich allein ihre Abschirmwirkung entfaltet und daher auch in Verbindung mit anderen Heizkordeln Gegenstand der Erfindung ist. Der folienartige Abdeckschirm ist also für schmiegsame Elektrowärmegeräte aller Art geeignet und wirksam.Although the invention in the embodiment according to FIG. 4 is described with reference to a flexible electric heating device, which has been described in combination with both special heating cords with which electromagnetic fields are shielded and a special cover with which electrical fields are shielded, it should be pointed out that that the cover disclosed here also develops its shielding effect on its own and is therefore the subject of the invention also in connection with other heating cords. The film-like cover is therefore suitable and effective for flexible electrical heating devices of all kinds.
Claims (9)
dadurch gekennzeichnet,
daß die Heizkordel (2) einen Hinleiter (8;16) und einen Rückleiter (9;17) aufweist, wobei der Widerstandswert des Hinleiters (8;16) gleich dem Widerstandswert des Rückleiters (9;17) ist.1. Supple electric heating device, with a heating cord having at least one heating conductor, meandering under a surface to be heated, with a temperature preselection switch and with a temperature control device,
characterized by
that the heating cord (2) has an outgoing conductor (8; 16) and a return conductor (9; 17), the resistance value of the outgoing conductor (8; 16) being equal to the resistance value of the return conductor (9; 17).
dadurch gekennzeichnet, daß wenigstens die zu beheizende Fläche (25) mit einer metallische Anteile enthaltenden Folie (24) oder bahnartigen Auflage versehen ist.8. Supple electric heating device, with a heating cord having at least one heating conductor, meandering under a surface to be heated, with a temperature preselection switch and with a temperature control device,
characterized in that at least the surface (25) to be heated is provided with a foil (24) or sheet-like support containing metallic components.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8901603U | 1989-02-11 | ||
| DE8901603U DE8901603U1 (en) | 1989-02-11 | 1989-02-11 | Flexible electric heating device with reduced interference field influence |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0383152A2 true EP0383152A2 (en) | 1990-08-22 |
| EP0383152A3 EP0383152A3 (en) | 1992-03-04 |
Family
ID=6835938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19900102288 Withdrawn EP0383152A3 (en) | 1989-02-11 | 1990-02-06 | Flexible electric heating apparatus |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0383152A3 (en) |
| DE (1) | DE8901603U1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998020711A1 (en) * | 1996-11-06 | 1998-05-14 | Beckmann Versand Gmbh | Electrically heatable device |
| EP0858244A2 (en) * | 1997-02-06 | 1998-08-12 | Alcatel | Field free heating cable |
| EP0873043A1 (en) | 1997-03-21 | 1998-10-21 | Micro Weiss Electronics | Heater wire with integral sensor wire and improved controller for same |
| US5908573A (en) * | 1997-12-30 | 1999-06-01 | Bask Technologies Llc | Electric floor heating system |
| US6303905B1 (en) | 2000-08-25 | 2001-10-16 | Bask Technologies Llc | Heating element construction for floor warming systems |
| DE10308724B4 (en) * | 2003-01-23 | 2006-03-09 | Beurer Gmbh & Co | Pliable warming device |
| GB2447748A (en) * | 2007-03-16 | 2008-09-24 | George Frederick Warner | An underfloor heating element |
| CN103453572A (en) * | 2013-08-23 | 2013-12-18 | 济南喜莱盈家俱制造有限公司 | Carbon fiber water heating device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8901603U1 (en) * | 1989-02-11 | 1989-03-30 | Wilhelm Wetzel GmbH & Co., 40789 Monheim | Flexible electric heating device with reduced interference field influence |
| DE4038167B4 (en) * | 1989-12-15 | 2005-10-20 | Bernhard Rall | Arrangement for heating flexible mats, textiles or the like |
| US5081339A (en) * | 1990-06-01 | 1992-01-14 | Sunbeam Corporation | Water bed heater |
| DE29613341U1 (en) * | 1996-08-01 | 1996-09-19 | Wilhelm, Friedrich, 85452 Moosinning | Current conductor and plug connectable with this |
| DE10126066B4 (en) * | 2001-05-28 | 2004-11-18 | Beurer Gmbh & Co | Warming device with a flexible radiator |
| US7196295B2 (en) * | 2003-11-21 | 2007-03-27 | Watlow Electric Manufacturing Company | Two-wire layered heater system |
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|---|---|---|---|---|
| DE566962C (en) * | 1931-03-29 | 1932-12-24 | Hans Weber | Process for the production of heating pads by fastening the heating wires on a layer of fabric and leading out the heating wire ends together |
| DE715880C (en) * | 1938-03-22 | 1942-01-08 | Norddeutsche App Bau Anstalt G | Flexible, electric heaters, in particular heating pads |
| US3222497A (en) * | 1963-04-30 | 1965-12-07 | Gen Electric | Electrically heated bedcover |
| US3758747A (en) * | 1970-10-19 | 1973-09-11 | C Rohr | Electric mattress |
| GB2134730A (en) * | 1983-02-02 | 1984-08-15 | Kannegiesser Martin | Heating device for appliances for gluing sheet-like textile articles |
| FR2590433A1 (en) * | 1985-11-20 | 1987-05-22 | Degois Cie Ets | Safety heating element intended to be used in particular in a heating cover |
| FR2611107A1 (en) * | 1987-02-17 | 1988-08-19 | Wesseltoft Per As | ELECTRIC PLATE HEATING DEVICE |
| DE8901603U1 (en) * | 1989-02-11 | 1989-03-30 | Wilhelm Wetzel GmbH & Co., 40789 Monheim | Flexible electric heating device with reduced interference field influence |
| EP0334824A2 (en) * | 1988-03-25 | 1989-09-27 | Calesco Foil AB | Flat electrical resistance heating element |
-
1989
- 1989-02-11 DE DE8901603U patent/DE8901603U1/en not_active Expired
-
1990
- 1990-02-06 EP EP19900102288 patent/EP0383152A3/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE566962C (en) * | 1931-03-29 | 1932-12-24 | Hans Weber | Process for the production of heating pads by fastening the heating wires on a layer of fabric and leading out the heating wire ends together |
| DE715880C (en) * | 1938-03-22 | 1942-01-08 | Norddeutsche App Bau Anstalt G | Flexible, electric heaters, in particular heating pads |
| US3222497A (en) * | 1963-04-30 | 1965-12-07 | Gen Electric | Electrically heated bedcover |
| US3758747A (en) * | 1970-10-19 | 1973-09-11 | C Rohr | Electric mattress |
| GB2134730A (en) * | 1983-02-02 | 1984-08-15 | Kannegiesser Martin | Heating device for appliances for gluing sheet-like textile articles |
| FR2590433A1 (en) * | 1985-11-20 | 1987-05-22 | Degois Cie Ets | Safety heating element intended to be used in particular in a heating cover |
| FR2611107A1 (en) * | 1987-02-17 | 1988-08-19 | Wesseltoft Per As | ELECTRIC PLATE HEATING DEVICE |
| EP0334824A2 (en) * | 1988-03-25 | 1989-09-27 | Calesco Foil AB | Flat electrical resistance heating element |
| DE8901603U1 (en) * | 1989-02-11 | 1989-03-30 | Wilhelm Wetzel GmbH & Co., 40789 Monheim | Flexible electric heating device with reduced interference field influence |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998020711A1 (en) * | 1996-11-06 | 1998-05-14 | Beckmann Versand Gmbh | Electrically heatable device |
| EP0858244A2 (en) * | 1997-02-06 | 1998-08-12 | Alcatel | Field free heating cable |
| EP0858244A3 (en) * | 1997-02-06 | 1998-09-30 | Alcatel | Field free heating cable |
| EP0873043A1 (en) | 1997-03-21 | 1998-10-21 | Micro Weiss Electronics | Heater wire with integral sensor wire and improved controller for same |
| US5908573A (en) * | 1997-12-30 | 1999-06-01 | Bask Technologies Llc | Electric floor heating system |
| US6303905B1 (en) | 2000-08-25 | 2001-10-16 | Bask Technologies Llc | Heating element construction for floor warming systems |
| DE10308724B4 (en) * | 2003-01-23 | 2006-03-09 | Beurer Gmbh & Co | Pliable warming device |
| DE10308724C5 (en) * | 2003-01-23 | 2013-03-14 | Beurer Gmbh | Pliable warming device |
| GB2447748A (en) * | 2007-03-16 | 2008-09-24 | George Frederick Warner | An underfloor heating element |
| CN103453572A (en) * | 2013-08-23 | 2013-12-18 | 济南喜莱盈家俱制造有限公司 | Carbon fiber water heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0383152A3 (en) | 1992-03-04 |
| DE8901603U1 (en) | 1989-03-30 |
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