KR-102963580-B1 - A HEATING CABLE

Abstract

The present invention relates to a heating cable used in electric floor mats and electric heating pads, which are widely used as auxiliary heating devices. The heating cable comprises a coated power line (1), a coated heating wire (2) having one end connected to the power line and configured to receive power supplied from the power line and generate heat by resistance heating, and a grounding wire. The grounding wire (3) is formed by flattening a plurality of carbon fibers to ensure good flexibility and is disposed on the outer surface of the coating layers (11, 21) of the power line (1) and the heating wire (2). The grounding wire (3), which receives heat generated from the heating wire (2), is configured to emit far-infrared rays. By forming the grounding wire from carbon fibers to receive heat generated from the heating wire and emit far-infrared rays, it has a beneficial effect on the human body. Additionally, by winding the heating wire and the power line in a double-winding shape with the grounding wire in a flat form, electromagnetic waves are discharged to the outside through the grounding wire, thereby preventing leakage of electromagnetic waves harmful to the human body. Furthermore, by not using a separate shield member, the structure is simplified, thereby improving manufacturing costs and productivity. there is.

Inventors

• 김민휘

Assignees

• 주식회사 한국피에치이

Dates

Publication Date

20260512

Application Date

20240206

Claims (4)

1. A heating cable comprising a covered power line (1), a heating line (2) having one end connected to the power line and configured to receive power supplied from the power line and generate heat by resistance heat, and a grounding line (3), wherein the grounding line (3) is disposed on the outer surface of the covering layers (11, 21) of the power line (1) and the heating line (2) and is disposed to surround the covering layers (11, 21) when forming an outer covering layer (4). The above ground wire (3) is formed by flattening a plurality of carbon fibers to ensure good flexibility and is disposed on the outer surface of the covering layers (11, 21) of the power wire (1) and the heating wire (2). The above grounding wire (3) is arranged by winding at least one layer spirally around the outer surface of the covering layers (11, 21) of the power line (1) and the heating wire (2) so as to discharge electromagnetic waves generated from the power line (1) and the heating wire (2) through a grounding terminal, and the above grounding wire (3) is wound in two layers around the covered power line (1) and the heating wire (2), wherein the first grounding wire (31) is wound first, and then the second grounding wire (32) is wound so as to be overlapped above the first grounding wires (31) to prevent leakage of electromagnetic waves generated from the power line and the heating wire, and the grounding wire (3) receiving heat generated from the heating wire (2) as a whole emits far-infrared rays.
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Description

Heating Cable The present invention relates to a heating cable, and more particularly to a heating cable with an improved structure in which a grounding wire minimizes the leakage of electromagnetic fields generated in metal heating wires and copper cores, and emits far-infrared rays by receiving heat from the heating wires. Generally, electric heating pads, electric mats, or electric carpets, which are widely used as auxiliary heating devices, utilize heating cables to generate heat; however, these heating cables generate electric and magnetic fields, raising concerns regarding their potential harm to the human body. In order to solve the problems caused by electromagnetic waves generated from such heating cables, Korean Registered Patent No. 10-1080564 (registration date October 31, 2011) comprises a pair of heating wires having a shape twisted together in a twisted form, comprising a heater wire that generates heat according to the flow of current and an insulating sheath that surrounds the outer surface of each heater wire; A heating cable for blocking electric and magnetic fields is disclosed, comprising a temperature sensing wire in which a temperature sensing winding is wound in one direction on a fiber of a predetermined thickness and the temperature sensing winding is wrapped together with the fiber in an insulating sheath, wherein the pair of heating wires and the temperature sensing wire are each wrapped in a first metal thin film and a second metal thin film, and the first metal thin film and the second metal thin film are covered together in an insulating sheath, and between the first and second metal thin films and the insulating sheath, one of a shield metal braid wrapping the first and second metal thin films and a third metal thin film is provided. However, outside the above-mentioned metal thin film films, a metal braid for shielding is provided, and since the metal braid for shielding is configured to block the electric field generated from a heating wire or a temperature sensing sensor wire by intertwining multiple metal wires (metal threads), there was a problem of low productivity due to increased manufacturing costs and an increase in the number of manufacturing processes because a metal braid for shielding formed by intertwining multiple metal wires had to be added. In addition, a method has been proposed in which the direction of the magnetic field generated perpendicular to the current flowing through the copper wire and the phase of the magnetic field generated perpendicular to the current flowing through the heating wire form a phase difference of 180 degrees so that the magnetic field generated in the copper wire and the magnetic field generated in the heating wire cancel each other out. However, since it is difficult to accurately maintain such a phase difference during the manufacturing process, the magnetic field cancellation effect due to the phase difference could not be expected in practice. FIG. 1 is a perspective view showing a state in which a ground wire is wound around the outer surface of a power line and a heating line in a heating cable according to the present invention. FIG. 2 is a cross-sectional view along line aa of FIG. 1 showing that a second grounding line is wound in a double overlapping manner between the wound portions of the first grounding lines in FIG. 1. The present invention will be described in more detail below with reference to the accompanying drawings illustrating embodiments of the present invention. In FIG. 1, a heating cable according to the first embodiment of the present invention comprises a power line (1) for supplying power, a heating wire (2) formed of, for example, a nichrome wire, having one end connected to the power line and receiving power supplied from the power line to generate heat by resistance heat, a covering layer (11, 21) formed of a heat-resistant insulating material covering the power line and the heating wire, a ground wire (3) disposed on the outer surface of the covering layers (11, 21) of the power line (1) and the heating wire (2), and an outer covering layer (4) molded with an insulating material made of a heat-resistant material to electrically insulate the power line (1), the heating wire (2), and the ground wire (3) insulated by the covering layers (11, 21). The covering layer (11) of the power line (1) can be formed, for example, by extruding Teflon, and the covering layer (21) of the heating wire (2) can be formed, for example, by extruding heat-resistant silicone rubber. In addition, the outer covering layer (4) covering the entire power line (1), heating wire (2), and ground wire (3) covered by the covering layers (11, 21) is formed of an insulating material that is heat-resistant and flexible. The grounding wire (3) is formed by flattening a plurality of carbon fibers to ensure good flexibility, and is placed on the outer surface of the covering layers (11, 21) of the power line (1) and the heating wire (2)