JP3142908U - Thread-like carbon heating element and planar heating element provided with the same - Google Patents

Abstract

An object of the present invention is to provide a filamentous carbon heating element that does not cause excessive energy consumption and is improved in thermal efficiency, and a sheet heating element provided with the same.
A carbon resistor 2 made of a deformable carbon fiber yarn is wound around an elastic wire 3 and further covered with an insulating coating material 4 such as a flexible resin to form a filamentous carbon heating element 1. . In addition, the sheet-like carbon heating element 1 was arranged in a meandering manner on the sheet-like member to constitute a sheet-like heating element.
[Selection] Figure 1

Description

  The present invention relates to a filamentous carbon heating element and a planar heating element provided with the same.

  Conventionally, sheet heating elements such as electric blankets and electric carpets are generated by energizing the heating wires (nichrome wires and tungsten wires) that are covered with blankets and carpets. Blankets and carpets are warmed by Joule heat. Heating wires are also embedded in sheet-like members in floor heating and snow-melting sheets, and the floor is warmed by Joule heat generated by energizing it, and the accumulated snow is melted.

  However, the electrical resistivity of nichrome wires and tungsten wires used as heat sources increases remarkably as the temperature rises, so the inrush current of the equipment using them is large and about 10 times the rating at the moment when the power is turned on. Rush current flows. For this reason, electromagnetic noise is generated, and there is a risk of causing electromagnetic interference to the device or electromagnetic waves adversely affecting the human body.

The present invention has been conceived in view of the above-described conventional problems, and does not cause extra energy consumption, and a filamentous carbon heating element that improves thermal efficiency and a surface shape on which the same is disposed. An object is to provide a heating element.
Another object of the present invention is to provide a filamentous carbon heating element that is free of electromagnetic interference to the device and a planar heating element provided with the same.

In order to achieve the above-mentioned object, the filamentous carbon heating element of the present invention is obtained by winding a carbon resistor made of a deformable carbon fiber yarn around an elastic wire, and further, insulating coating such as a resin having flexibility as a whole. It is characterized by being covered with a material.
The filamentous carbon heating element of the present invention is characterized in that a carbon resistor made of a deformable carbon fiber yarn is coated with an insulating coating material such as a flexible resin.
The planar heating element of the present invention is characterized in that the above-described thread-like carbon heating element is arranged meandering on the planar member.

The effect | action by the said problem-solving means is as follows.
Carbon fiber has a large electric resistance value and easily generates heat. The carbon resistor generates heat by conducting to the carbon resistor made of such carbon fiber yarn. Since the carbon fiber has a negative resistance temperature characteristic in which the resistance value decreases with increasing temperature, the inrush current at the time of voltage application is reduced by using the filamentous carbon heating element of the present invention.

  According to the present invention having the above configuration, since the inrush current can be reduced, no extra energy consumption occurs, the thermal efficiency can be improved, and the filamentous carbon heating element free from electromagnetic interference with the device and A planar heating element provided with this can be provided. In addition, far-infrared rays are emitted by heating the carbon fiber yarn, and there is little irritation to the skin, and a far-infrared effect such as acting gently on the human body can be expected.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

<I> Filamentous carbon heating element (Fig. 1)
The filamentous carbon heating element 1 is obtained by winding a carbon resistor 2 made of carbon fiber yarn around an elastic wire 3 such as a wire or copper wire, and further covering the whole with an insulating coating material 4 such as a flexible resin. is there. Further, instead of coating with the insulating coating material 4, a liquid resin or the like may be applied to the carbon resistor 2 and cured. When the terminals 5 are attached to both ends of the filamentous carbon heating element 1 and are connected through the terminals 5, the filamentous carbon heating element 1 generates heat.

<B> Carbon resistor (Fig. 2)
In the carbon resistor 2 composed of carbon fiber yarns, for example, a large number of PAN-based carbon fiber strands 21 made of polyacrylonitrile are bundled to form a PAN-based carbon fiber yarn 22, and a plurality of PAN-based carbon fiber yarns 22 are twisted. It consists of twisted yarns combined. The carbon resistor 2 formed by twisting a number of PAN-based carbon fiber yarns 22 in this way has high elasticity and high strength characteristics. However, in order to maintain sufficient heat resistance and strength as a heating element, the carbon resistor 2 has a thickness. The (diameter) is desirably about 1 mm to 5 mm. By using the twisted yarn, the carbon resistor 2 is more difficult to unwind compared to the case where the PAN-based carbon fiber yarns 22 are simply bundled.
In order to improve processability such as coating, the carbon resistor 2 is preferably immersed in a liquid resin and cured. Further, the surface is coated and smoothened by immersing the carbon resistor 2 in a liquid resin or the like.

<C> Terminal (Fig. 3)
The terminal 5 includes a bendable conductive band-shaped metal plate 50 and a lead wire 51 connected thereto (see FIGS. 3C and 3D). To attach the terminal 5 to the carbon resistor 2, first, as shown in FIG. 3 (A), a T-shaped strip-shaped metal plate 50 is formed, both sides are bent vertically and a notch 52 is made in a part thereof, and a corrugated shape is further formed. The uneven portion 53 is formed (FIG. 3B). One end of the carbon resistor 2 is inserted here, and the wavy uneven portion 53 is bent (FIG. 3B). Further, the vertical bent portions on both sides are also bent so that the wavy uneven portion 53 is crimped to the carbon resistor 2. The lead wire 51 is spot welded to the tongue piece 54, and the terminal 5 is attached to both ends (FIGS. 3C and 3D).
The terminal 5 is not limited to the above, and any terminal can be used as long as one end of the carbon resistor 2 can be fixed, such as by simply winding the belt-shaped metal plate 50.

<D> Planar heating element (Fig. 4)
FIG. 4 shows a wiring state of a planar heating element (electric blanket, electric carpet, etc.) 7 in which the filamentous carbon heating element 1 is embedded. The filamentous carbon heating element 1 is meanderingly disposed on the heat radiation surface of the planar heating element 7, and the terminal 5 (lead wire 51) is connected to the energization control unit 8. A plug 10 is attached to the end of the energization control unit 8 via a cord 9. When the plug 10 is inserted into an outlet (not shown), the filamentous carbon heating element 1 generates heat and the planar heating element 7 radiates heat while being controlled by the energization control unit 8.
When manufacturing the sheet heating element 7, first, the carbon resistor 2 is wound around the elastic wire 3 and covered with the insulating coating material 4. The carbon resistor 2 has conductivity, and thus the element wire 21. The electrical conductivity (resistance value) can be appropriately adjusted by adjusting the diameter of the wire, the number of strands of the strands 21 and the like.

<E> Action When the terminal 5 of the filamentous carbon heating element 1 configured as described above is energized, a current flows through the carbon resistor 2 and the carbon resistor 2 generates heat. Since the carbon resistor 2 is made of a twisted yarn in which a plurality of carbon fiber strands 21 are twisted together, a current flows uniformly through the carbon resistor 2 and a uniform high heat generation efficiency is obtained over the entire surface. Further, since the carbon resistor 2 is covered with the insulating coating material 4, the carbon resistor 2 is not oxidized even when used in a high temperature environment, and the long-lasting filamentous carbon heating element 1 is obtained. For this reason, the lifetime of the planar heating element 7 using the filamentous carbon heating element 1 is greatly extended.
Further, the filamentous carbon heating element 1 can be bent according to the shape of the planar heating element 7 or can be deformed appropriately in the manufacturing process, so that the planar heating element can be obtained. The degree of freedom of design 7 is increased.
Since the resistance value of the filamentous carbon heating element 1 is inversely proportional to the cross-sectional area and proportional to the length, the required output is designed by changing the diameter of the carbon fiber strands 21 to be twisted, the number of carbon fiber strands 21 being increased or decreased, and the like. be able to.

Next, another embodiment of the present invention will be described with reference to FIG.
In this example, the carbon resistor 2 is dipped in a liquid resin or the like and cured appropriately, and the carbon resistor 2 is covered with an insulating coating material 4 such as a flexible resin without being wrapped around the elastic wire 3. is there. Since the carbon resistor 2 is appropriately cured, it can be bent according to the shape of the planar heating element 7 or can be appropriately deformed in the manufacturing process.

The schematic perspective view which shows the filamentous carbon heat generating body of this invention. The perspective view of a carbon resistor. Schematic which shows the manufacturing process of a terminal. Schematic which shows the planar heating element of this invention. The schematic perspective view which shows the other example of a filamentous carbon heat generating body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Filamentous carbon heating element 2 ... Carbon resistor 21 ... PAN type carbon fiber strand 3 ... Elastic wire 4 ... Insulation coating material 5 ... Terminal 50 .... Strip metal plate 7 ... Surface heating element 8 ... Energization control unit

Claims (3)

  A yarn-like carbon heating element, wherein a carbon resistor made of a deformable carbon fiber yarn is wound around an elastic wire, and the whole is covered with an insulating coating material such as a flexible resin.   A yarn-like carbon heating element, wherein a carbon resistor made of a deformable carbon fiber yarn is coated with an insulating coating material such as a flexible resin.   A planar heating element, wherein the filamentous carbon heating element according to claim 1 or 2 is meanderingly disposed on a planar member.

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