JP6104085B2 - Low voltage lead-in wire - Google Patents

Description

  The present invention relates to a low-voltage lead-in electric wire used as a low-voltage lead-in wire.

  Conventionally, a low-voltage lead-in wire in which a plurality of insulation-coated wires are twisted together is used as a low-voltage lead-in wire connecting a low-voltage overhead wire such as a utility pole and an indoor wire in a building. A colored resin is used for the insulation coating of each electric wire in order to identify each wire core. As an example of the insulation coating using the colored resin, there is one in which a colored resin color band is provided along the extending direction of the electric wire on the outer peripheral surface of the base color (black) insulation coating (for example, Patent Document 1). .

  The colored resin usually does not contain carbon, and has a lower ultraviolet blocking effect than a base color (black) insulating coating containing carbon and is likely to be oxidized and deteriorated. For this reason, in order to avoid the deterioration of the insulation characteristics due to the generation of cracks due to the irradiation of sunlight, it has been conventionally preferred to color the insulation coating with a color band for identification.

JP 2007-194023 A

  However, if each electric wire is twisted together to form a low-voltage lead-in electric wire, the color band of each electric wire may be covered with another electric wire and may be difficult to see. Further, if the layer thickness of the color band is made as thin as possible in order to avoid a decrease in the ultraviolet blocking effect, the background color (black) behind the color band is seen through and the color band is easily visually recognized as a dark color system as a whole. For this reason, especially when performing wiring work in a dark place, it may be more difficult to identify the core of the wire by a color band that is covered with other wires and is difficult to see.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a low-voltage lead-in electric wire that can easily identify the core of each electric wire by a color band even in a dark place.

Colored strip for identification in the extending direction of the wire is Te plurality of twisted low pull-in wire odor that is configured to cover the electric wire provided on the outer circumferential surface of the insulating coating,
The insulating coating is composed of two layers, an inner layer and an outer layer,
The outer layer exposed on the outer peripheral surface of the covered electric wire is composed of carbon black and colored black,
Before Kiirotai is formed on the outer peripheral surface of the outer layer of a resin material containing a white inorganic pigment or lightness 6 in the Munsell color system,
The inner layer located inside the outer layer is composed of a resin material blended with a white inorganic pigment ,
It shall be the features a.

  According to the low-voltage lead-in wire according to the first aspect of the present invention, the color band formed of the resin material containing the white inorganic pigment is visually recognized as white having a brightness of 6 or more in the Munsell color system. As such a white inorganic pigment, for example, titanium oxide (titanium dioxide), zinc sulfide, zinc oxide and the like can be used. Moreover, it is good also as a light-emitting body which adds an activator and has a luminous function.

  And, by forming a color band with a resin material containing such a white inorganic pigment, even if the color band is covered with another covered electric wire, it can be found if the color band is partially exposed from the gap. In addition, the wire core can be easily identified even in work in a dark place.

  The low-voltage lead-in electric wire according to the present invention described in claim 2 is the low-voltage lead-in electric wire according to the present invention described in claim 1, wherein the color band is shifted in phase by 180 degrees in the circumferential direction of the outer peripheral surface. Two color bands are provided, and each color band has a width of 15% or more and 22.5% or less of the entire circumference of the outer peripheral surface.

  According to the low-voltage lead-in electric wire of the present invention described in claim 2, in the low-voltage lead-in electric wire according to the present invention described in claim 1, the portion where the color band is exposed even if twisted with another covered wire is low-pressure lead-in. The electric wire can be surely provided, and the core core can be further distinguished.

  Further, the width of the color band provided by shifting the phase by 180 degrees for each half of the insulating coating in the circumferential direction of the insulating coating is set to 15% or more of the entire circumference of the outer peripheral surface of the insulating coating, so that The exposure of the color band when twisted with the electric wire can be ensured.

  Further, the width of the color band is set to 22.5% or less of the entire circumference of the outer peripheral surface of the insulating coating, so that even if the color band is formed with a resin material containing a white inorganic pigment and not containing carbon, insulation is achieved. The ultraviolet blocking effect required by the coating can be ensured.

  In addition, at least one of the plurality of covered electric wires has a double insulating coating with an inner layer and an outer layer, and the color band is formed on the outer peripheral surface of the outer layer formed of a resin material containing carbon. It is good also as a structure which is provided and the said inner layer is colored the same color as the said color belt.

  By configuring in this way, even if it becomes difficult to identify the core by color band due to the color band falling off the insulation coating, the color of the inner layer can be confirmed on the end face (cut surface) of the insulation coating. The wire core of the electric wire can be easily identified.

  ADVANTAGE OF THE INVENTION According to this invention, the wiring operation | work in the whole low voltage | pressure lead-in electric wire can be simplified, and it can contribute to size reduction and thickness reduction of the illumination side.

It is sectional drawing of the low voltage lead-in electric wire which concerns on the reference example of this invention. It is explanatory drawing which shows typically the relationship of the width | variety of the color band with respect to the perimeter of the insulation coating of the low voltage lead-in electric wire of FIG. 1 with reference to the half part of an insulation coating. It is explanatory drawing of the low voltage lead-in electric wire which concerns on one Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings. First, a low-voltage lead-in wire according to a reference example of the present invention will be described with reference to the cross-sectional view of FIG.

In FIG. 1, reference numeral 1 is a low-voltage lead-in wire such as a DV wire according to a reference example of the present invention, and is configured by twisting first to third three covered wires 11 to 13.

  The first covered electric wire 11 is configured by covering a conductor 11a such as an annealed copper wire with an insulating coating 11b, for example. The insulating coating 11b is made of polyethylene (PE) colored in black by blending carbon black that improves UV resistance.

  The second and third covered electric wires 12 and 13 are configured by covering conductors 12a and 13a such as annealed copper wires with insulating coatings 12b and 13b, for example. Each of the insulating coatings 12b and 13b is made of polyethylene (PE) that is colored black by blending carbon black that improves ultraviolet resistance, as in the case of the first covered electric wire 11.

  Then, on the surfaces of the insulation coatings 12b and 13b of the second and third covered electric wires 12 and 13, color bands along the extending direction of the respective covered electric wires 12 and 13 (the central axis direction of the conductors 12a and 13a). 12c and 13c are formed. The color bands 12c and 13c are made of polyethylene (PE) colored in a color for identifying the specifications of the conductors 12a and 13a.

In this reference example , the second and third covered electric wires 12 and 13 have the same specifications, and therefore the color bands 12c and 13c are colored in the same color. Specifically, the color bands 12c and 13c are made of polyethylene (PE) blended with a white inorganic pigment. Examples of white inorganic pigments that can be used include titanium oxide (titanium dioxide), zinc sulfide, and zinc oxide. Moreover, it is good also as a light-emitting body which adds an activator and has a luminous function.

  The color bands 12c and 13c described above have a color that is visually recognized as white having a brightness of 6 or more in the Munsell color system. The color bands 12c and 13c may be formed by extrusion at the same time when the conductors 12a and 13a are covered with the insulation coatings 12b and 13b, and the outer peripheral surfaces of the insulation coatings 12b and 13b after the extrusion molding. Alternatively, it may be formed by two-color molding.

  In addition, the two color bands 12c and 13c described above are provided with a phase shift of 180 degrees in the circumferential direction of the outer peripheral surfaces of the insulating coatings 12b and 13b. FIG. 2 is an explanatory diagram schematically showing the widths of the color bands 12c and 13c with reference to half portions of the outer peripheral surfaces of the insulating coatings 12b and 13b. As shown in FIG. 2, each of the color bands 12c and 13c has a width of 15% or more and 22.5% or less of the entire circumference of the outer peripheral surface of the insulating coatings 12b and 13b.

  When the width of each color band 12c, 13c is 15% or more of the entire circumference of the outer peripheral surface of the insulation coating 12b, 13b is less than 15%, it is twisted together with the other covered electric wires 11, 13 (11, 12) This is because the color band 12c (13c) may not be exposed at all.

  Further, the reason why the width of each color band 12c, 13c is 22.5% or less of the entire circumference of the outer peripheral surface of the insulation coating 12b, 13b is more than 22.5%, the color band not containing carbon black There is a possibility that the ratio of 12c and 13c to the outer peripheral surfaces of the insulating coatings 12b and 13b becomes too large, and it becomes impossible to ensure the necessary resistance against the deterioration of the insulating coatings 12b and 13b due to ultraviolet irradiation and the occurrence of cracks associated therewith Because there is.

  That is, by providing one color band 12c, 13c with the above-described width for each half of the outer peripheral surface of the insulating coatings 12b, 13b, the color bands 12c, 13c are exposed even when twisted with the covered wires 11-13. Can be securely held in the low-voltage lead-in electric wire 1 and the discriminability of the cores (specifications) of the second and third covered electric wires 12 and 13 can be improved.

  Moreover, the color band 12c (13c) is formed with the other covered electric wires 11, 13 by forming the color bands 12c, 13c that are visually recognized as white with a lightness of 6 or more in the Munsell color system by using polyethylene containing a white inorganic pigment. Even if it is covered with (11, 12), it can be found if the color band 12c (13c) is partly exposed from the gap, and the core can be easily identified even in the work in a dark place.

  In addition, when the 2nd and 3rd covered electric wires 12 and 13 are a thing with a different specification (wire core), according to it, the color band 12c (13c) of any one of the covered electric wires 12 and 13 is set to white. You may form with the polyethylene colored other than.

FIG. 3 is a cross-sectional view of a low-voltage lead-in wire according to an embodiment of the present invention. In the low-voltage lead-in wire 1A of the present embodiment, instead of the third covered wire 13 of the low-voltage lead-in wire 1 of the reference example shown in FIG. And the second covered electric wires 11 and 12 are twisted together.

  And as for the 4th covered electric wire 14, the insulation coating 14b which covers the conductor 14a is comprised by two layers, inner layer 14b1 and outer layer 14b2. Among these, the outer layer 14b2 exposed on the outer peripheral surface of the fourth covered electric wire 14 is composed of polyethylene (PE) colored with black by blending carbon black, like the insulating coating 12b of the second covered electric wire 12. Yes.

  Similar to the second and third covered wires 12 and 13, two color bands 14 c and 14 c are formed on the outer peripheral surface of the outer layer 14 b 2 along the extending direction of the fourth covered wire 14. Each color band 14c is 15% or more and 22.5% or less of the entire circumference of the outer peripheral surface of the insulating coating 14b (outer layer 14b2) for the same reason as the color bands 12c and 13c of the second and third covered wires 12 and 13. Have a width of

  On the other hand, the inner layer 14b1 located inside the outer layer 14b2 is made of polyethylene (PE) blended with a white inorganic pigment together with two color bands 14c and 14c. Examples of white inorganic pigments that can be used include titanium oxide (titanium dioxide), zinc sulfide, and zinc oxide. Moreover, it is good also as a light-emitting body which adds an activator and has a luminous function.

  Similarly to the color bands 12c and 13c of the second and third covered electric wires 12 and 13, the color band 14c described above has a color visually recognized as white with a brightness of 6 or more in the Munsell color system. The color band 14c may be formed by extrusion at the same time as the outer layer 14b2 is extruded, or may be formed on the outer peripheral surface of the outer layer 14b2 after extrusion by two-color molding.

  In the low-voltage lead-in wire 1A of the present embodiment, when the second and fourth covered wires 12, 14 have different specifications (wire cores), either one of the covered wires 12, The 14 color bands 12c (14c) may be formed of polyethylene colored in a color other than white.

Even with the low-voltage lead-in wire 1A according to one embodiment of the present invention configured as described above, the same effects as those of the low-voltage lead-in wire 1 of the reference example can be obtained. In addition, in the low-voltage lead-in electric wire 1A according to the present embodiment , the insulating coating 14b of the fourth coated electric wire 14 is made into two layers of the inner layer 14b1 and the outer layer 14b2, and the inner layer 14b1 is the same as the color band 14c, and a white inorganic pigment is blended. Made of polyethylene (PE). For this reason, even if the color band 14c is dropped from the outer layer 14b2 and it becomes difficult to identify the specification (wire center) by the color band 14c, the color of the inner layer 14b1 is confirmed on the end surface (cut surface) of the insulating coating 14b. Thus, the specification (wire core) of the fourth covered electric wire 14 can be easily identified.

  INDUSTRIAL APPLICABILITY The present invention is extremely useful for a low-voltage lead-in electric wire used as a low-voltage lead-in wire that connects a low-voltage overhead wire such as a utility pole and a building indoor wire.

1, 1A Low-voltage lead-in wire 11 First covered wire 11a, 12a, 13a, 14a Conductor 11b, 12b, 13b, 14b Insulation cover 12 Second covered wire 12c, 13c, 14c Color band 13 Third covered wire 14 Fourth coated electric wire 14b1 inner layer 14b2 outer layer

Claims (2)

Colored strip for identification in the extending direction of the wire is Te plurality of twisted low pull-in wire odor that is configured to cover the electric wire provided on the outer circumferential surface of the insulating coating,
The insulating coating is composed of two layers, an inner layer and an outer layer,
The outer layer exposed on the outer peripheral surface of the covered electric wire is composed of carbon black and colored black,
Before Kiirotai is formed on the outer peripheral surface of the outer layer of a resin material containing a white inorganic pigment or lightness 6 in the Munsell color system,
The inner layer located inside the outer layer is composed of a resin material blended with a white inorganic pigment ,
A low-voltage lead-in wire characterized by that.   Two color bands are provided with a phase difference of 180 degrees in the circumferential direction of the outer peripheral surface, and each color band has a width of 15% or more and 22.5% or less of the entire circumference of the outer peripheral surface. The low-voltage lead-in electric wire according to claim 1, wherein

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