JP2007317477A - Twisted-wire conductor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a twisted-wire conductor, consisting of 19-core strands, whose outline becomes nearly round, without compressing the strands. <P>SOLUTION: Of the twisted-wire conductor 1 of 19 cores structured of three kinds of strands with different diameters, the strands constituting center wires 11 and an inner layer 1A are of mid-diameter wires 3, six-core small-diameter wires 2 narrower than the mid-diameter wires 3 and six-core large-diameter wires 4 larger than the mid-diameter wires 3 are used as the strands constituting an outer layer 1B, these of which are arranged alternately in a peripheral direction, and at the same time, the six-core small-diameter wires 2 are arranged so as to have their center point positioned on an extension line connecting the center of the center wires 11 and that of the six-core mid-diameter wires constituting the inner layer 1A, the large-diameter wires 4 are arranged at a valley part 5 formed of outer faces of the adjacent mid-diameter wires constituting the inner layer, with each strand in contact with all the adjacent strands, and with a distance from the center wires 11 to an outermost edge end of the small-diameter wires 2 and that from the center of the center wires 11 to an outermost edge end of the large-diameter wires 4 set equal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stranded wire conductor, and more particularly, to a stranded wire conductor configured by a 19-core concentric stranded arrangement used for electric wires and the like.

  Conventionally, each strand constituting a stranded conductor used for an electric wire or the like is generally a round wire having a circular cross section and the same diameter. A copper wire is mainly used as the element wire, and a copper wire plated with tin, nickel, silver, an aluminum wire, and various alloy wires are used.

  In addition, as shown in FIG. 4, a stranded conductor composed of 19 core wires generally has a single core wire 102 as a core and a 6 core wire 103 covering the periphery. It is a 19-core concentric twisted arrangement in which an inner layer is formed to enclose and an outer layer is formed by enclosing the outer periphery with 12 cores 104, and it is twisted in the same direction as shown in FIG. A stranded conductor 101 is formed.

  Since the strands 102, 103, 104 are all circular in cross section and have the same diameter, the outer shape of the 19-core concentric strand arrangement stranded conductor 101 composed of the strands 102, 103, 104 As shown in FIG. 4, the shape approximates a hexagonal shape and does not approximate a round shape. Hereinafter, the stranded wire conductor 101 is referred to as Conventional Technology 1.

  Further, the stranded wire conductor 101 is generally used for an electric wire or the like as a covered wire in which an outer peripheral portion is covered with an insulating material 106, as shown in FIG. The outer shape of the covered wire is desired to be a substantially perfect circle. On the other hand, it is desirable that the insulating material 106 is coated substantially uniformly on the outer periphery of the stranded wire conductor 101 in terms of pressure resistance. Therefore, it is desired that the outer shape of the stranded wire conductor is a perfect circle.

  Further, the reduction in the amount of the insulating material 106 containing petroleum as a main component is very important from the viewpoint of effective use of resources, and the stranded wire conductor is required to be reduced in diameter or rounded.

  However, as described above, when the outer shape of the stranded wire conductor 101 is a hexagon and the outer surface shape of the covered wire is a perfect circle, the outer shape of the stranded wire conductor 101 is insulated in the vicinity of the apex of the hexagon. The thickness of the material 106 is thin, and becomes thicker as it reaches the hexagonal side, and the thickness of the insulating material 106 becomes uneven. Further, in order to prevent a breakdown voltage failure, it is necessary to secure a certain thickness or more for the insulating material 106 located at the apex of the hexagon. Therefore, the covered wire cannot be made thinner than the diameter from the center of the stranded wire conductor 101 to its apex, and there is a problem that there is a limit to reducing the diameter and weight of the covered wire.

  Further, the thickness of the insulating material 106 located on the side is excessive from the viewpoint of performance, but is necessary to make the cross section a perfect circle, so there is a limit in reducing the amount of the insulating material 106. There is a problem.

  Further, when the outer shape of the stranded wire conductor 101 is a hexagon, there is a problem that the stranded wire conductor 101 may be damaged when the covering material 106 is stripped when the coated wire is subjected to terminal processing.

The above problem can be solved by making the outer shape of the stranded conductor into a substantially perfect circle.
As a means for solving this problem, as shown in Patent Document 1, a strand conductor 201 having a circular cross section and having the same diameter is passed through a compression die while twisting in one direction, as shown in FIG. A method has been proposed in which the outer surface 203 of the outer layer wire 202 is subjected to pressure deformation so that the outer shape of the stranded wire conductor 201 becomes a substantially perfect circle. Hereinafter, the stranded wire conductor 201 is referred to as Conventional Technology 2.
JP 2000-057852 A

  Since the outer strand 202 of the stranded conductor 201 of the prior art 2 is compressed and deformed by a compression die, there is a problem that physical characteristics such as stretch characteristics, flexibility, and flexibility are impaired.

  Further, the twisted conductor 201 of the prior art 2 needs to pass a compression die while twisting in one direction. Therefore, an extra compression die is required as compared with the twisted conductor 101 of the prior art 1, and this compression The dies have a problem in that wear damage occurs during the production of the stranded wire conductor, so that periodic replacement is necessary and the cost becomes high.

  Further, in order to make the stranded wire conductor 201 after compression substantially circular, it is necessary to set the rotation speed of the production machine (twisting machine) to a certain value or less and stabilize the rotation speed. There is also a problem that the production efficiency is worse than that of the single stranded wire conductor 101.

  Therefore, the present invention provides a stranded wire conductor composed of 19 core wires, and the stranded wire conductor has a substantially perfect circular shape without compressing the strand. It is intended to do.

In order to solve the above-mentioned problem, the invention according to claim 1 is provided with a center line composed of one core wire, and an inner layer is formed by surrounding the center line with six core wires, , A 19-core stranded wire conductor that surrounds its outer periphery with 12 core wires to form an outer layer,
As said strand, three kinds of thin diameter wires with different diameters, medium diameter wires, and large diameter wires are used,
All the strands constituting the center line and the inner layer are the medium diameter wires,
As the strands constituting the outer layer, the six thin diameter wires thinner than the medium diameter wire and the six thick wires thicker than the medium diameter wire are alternately arranged in the circumferential direction. And
The six-core thin diameter wires are arranged so that the center thereof is located on an extension line connecting the center of the center line and the center of the six-core medium diameter wires constituting the inner layer, and the inner layer is A thick wire is disposed in the valley formed by the outer surfaces of the adjacent medium wires in the 6 wires constituting the medium wire,
Each strand is in contact with all adjacent strands;
The distance from the center of the center line to the outermost edge of the thin line is equal to the distance from the center of the center line to the outermost edge of the thick line.

  According to the present invention, the outer shape of the stranded conductor can be made into a substantially circular shape without compressing and deforming the strands, and each strand can be brought into contact with all adjacent strands.

Further, the maximum outer diameter can be made thinner than the stranded wire conductors 101 and 201 of the prior arts 1 and 2.
Thus, the outer shape of the stranded wire conductor is substantially perfect circle shape and, as described above, can be made thinner than the stranded wire conductors 101 and 201 of the prior arts 1 and 2, thereby reducing the coating thickness of the insulating material. The entire circumference can be made thin and can be made substantially uniform, the amount of insulating material can be reduced, and the cost can be reduced.

  Further, unlike the stranded wire conductor 201 of the prior art 2, since the strand is not passed through the compression die, the outer layer strand is not compressed and deformed. Therefore, the physical characteristics of the strands can be maintained without deteriorating the physical characteristics such as the stretch characteristics, flexibility, and flexibility, and a highly reliable quality can be obtained.

The best mode for carrying out the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view of a stranded wire conductor 1 of the present invention. The stranded wire conductor 1 includes a thin wire (element wire) 2, a medium diameter wire (element wire) 3, and a large diameter wire (element wire). 4 of three types of strands. Further, as shown in FIG. 1, the stranded conductor 1 is composed of 19 core wires, and a single core wire (center line) 11 located at the center is used as a core, and the surroundings are 6 core wires. This is a 19-core concentric twisted arrangement in which a wire surrounds and forms the inner layer 1A, and further, 12 cores surround the outer periphery to form the outer layer 1B. Further, each of the strands 2, 3, 4 is configured to come into contact with all other adjacent strands 2, 3, 4.

  As the strands 2, 3, and 4, wires having a circular cross section (round shape) are used, and copper wires, copper wires plated with tin, nickel, silver, aluminum wires, various types as in the past. Alloy wire can be used.

The center line 11 is a wire 3 having a diameter of _{d 2.} Hereinafter, this is also referred to as a medium diameter wire 3. The inner layer 1 </ b> A is composed of only a strand having the same diameter d ₂ as the center line 11, that is, one type of strand having a medium diameter 3.

The outer layer 1B includes a strand 2 having a diameter d ₁ thinner than the medium diameter wire 3 (hereinafter also referred to as a thin diameter wire 2) and a strand 4 having a diameter d ₃ thicker than the medium diameter wire 3 (hereinafter referred to as this). Is also referred to as a thick wire 4). The small-diameter wire 2 is disposed such that the center thereof is located on an extension line connecting the center A of the center line 11 and the center of the strand (medium-diameter wire) 3 of the inner layer 1A. Is arranged between the outer surface of the thin wire 2 and the outer surface of the thin wire 2 (that is, the valley portion 5 formed by the outer surface of the medium wire 3 and the outer surface of the medium wire 3 constituting the inner layer 1A). It is installed. As shown in FIG. 1, the thin diameter wire 2 and the large diameter wire 4 are alternately arranged in the circumferential direction.

Each strand 2, 3 and 4 is in contact with all adjacent strands 2, 3 and 4.
Further, the outer shape of the stranded wire conductor 1 is a substantially perfect circle shape, that is, the distance L1 from the center A of the center line 11 to the outermost edge B of the thin wire 2 and the center wire 11 to the thick wire. 4 is formed such that the distance L3 to the outermost edge C is substantially the same. That is, the outermost edge ends B and C of all the thin diameter lines 2 and the large diameter lines 4 forming the outer layer 1B are from the center A of the center line 11 to the outermost edge edge B of the small diameter line 2 as shown in FIG. It is formed so that it may be located on the substantially perfect circle line which makes the distance L1 to a radius.

  The outer surface of each of the strands 2, 3, 4 is in contact with the outer surface of all the strands 2, 3, 4 adjacent to the strands 2, 3, 4, and the small diameter wire from the center A of the center line 11 The distance L1 to the outermost edge B of 2 and the distance L3 from the center A of the center line 11 to the outermost edge C of the large diameter line 4 are set to be the same.

Then, the diameter of these strands 2,3,4, i.e., the diameter _{d 1} of the thin line 2, the diameter _{d 2} of the middle meridian 3, the relationship between the diameter _{d 3} of the thick diameter line 4 will be described.

The distance L1 from the center A of the center line 11 to the outermost edge B of the thin wire 2 is
_{L1 = d 2/2 + d} 2 + d 1 ··· (1)
It becomes.

When the outer layer strand is the medium diameter line 3 shown by the broken line in FIG. 2 as in the prior art 1, the outermost edge D of the center line 11 (medium diameter line 3) and the innermost edge E of the medium diameter line 3 of the outer layer. The distance L2 from
L2 = 2 (cos30 ° −1 / 2) d ₂ (2)
It becomes.

  When the inner diameter line 3 of the outer layer is changed to the larger diameter line 4, the innermost edge E ′ of the larger diameter line 4 is positioned outside the innermost edge E of the intermediate diameter line 3 as shown in FIG. 2. The difference between the innermost edge E ′ of the thick wire 4 and the innermost edge E of the medium wire 3 is defined as α. Note that the diameter of the thick wire 4 in FIG. 2 is made larger than the actual one so that α can be seen.

The distance L3 from the center A of the center line 11 to the outermost edge C of the large diameter line 4 is
_{L3 = d 2/2 + 2} (cos30 ° -1 / 2) d 2 + α + d 3 ··· (3)
It becomes.

The outer shape of the stranded wire conductor 1 is substantially circular, that is, the distance from the center A of the center line 11 to the outermost edge B of the thin wire 2 and the outermost edge 4 of the thin wire 2 from the center A of the center wire 11. The reason why the distance to the outer edge C is the same is L1 = L3. Therefore, from the equations (1) and (3),
_{d 2/2 + d 2 +} d 1 = d 2/2 + (cos30 ° -1 / 2) d 2 + α + d 3 ··· (4)
It becomes.

If the position G is a perpendicular line from the center F of the thin wire 2 to the straight line AC, the distance of the straight line FG is L4, and β is a variable,
_{L4 = d 3/2 + d} 1/2-β ··· (5)
When the distance L5 from the center A of the center line 11 to the center F of the thin wire 2 is sin30 ° = L4 / L5
_{= (D 3/2 + d} 1/2-β) / (d 2/2 + d 2 + d 1/2)
Than,
_{d 3/2 + d 1/} 2-β = (d 2/2 + d 2 + d 1/2) / 2 ··· (6)
It becomes.

Since the diameters of the strands 2, 3, and 4 used for the actual stranded conductor 1 are as thin as 0.6 mm or less, α and β are extremely small and smaller than the processing accuracy. It can be approximated as zero, and when α and β are approximated as zero, from Equations (4) and (6), d ₁ = 0.82137 × d ₂ (7)
d ₃ = 1.08932 × d ₂ (8)
By constructing the stranded conductor 1 using the thin wire 2, the medium wire 3, and the thick wire 4 where such a relationship is established, the strands 2, 3, 4 are The distance from the center A of the center line 11 to the outermost edge B of the thin wire 2 and the center wire 11 from the center A to the thick wire 4 The distance to the outermost edge C can be made the same.

The outer diameter D1 of the stranded conductor 1 of the present application, since it is D1 = 2 × L1, formula (1) from _{D1 = 2 × (d 2/} 2 + d 2 + d 1) ··· (9)
When formula (7) is introduced into formula (9), D1 = 4.6427 × d ₂ (10)
It becomes.

On the other hand, in the prior art 1, the maximum outer diameter D2 of the stranded conductor 101 when the diameter of the wires was assumed d _2, as is apparent from FIG. 4,
D2 = 5 × d ₂ (11)
It is.

Also, assuming the outer diameter D3 of the stranded conductor 201 of the prior art 2, the diameter of the wires in the d _2, and the compression ratio of 3% in the diameter ratio (best compression ratio in stranded conductor 201) Then
D3 = 5 × d ₂ × (1-3 / 100) = 4.85 × d ₂ (12)
It is.

  Therefore, D1 <D3 <D2, and it can be seen that the stranded wire conductor 1 of the present invention can be made smaller in the maximum outer diameter than the stranded wire conductors 101 and 201 of the prior arts 1 and 2.

However, assuming that the strands of the prior arts 1 and ₂ are d ₂ in this way, the conductor cross-sectional area is different between the stranded conductor 1 of the present invention and the stranded conductors 101 and 201 of the prior art.

  Therefore, next, the outer diameters D1 ′ and D2 of the stranded wire conductors 1, 101, and 201 when the conductor cross-sectional areas of the stranded wire conductor 1 of the present invention and the stranded wire conductors 101 and 201 of the prior art 1 and 2 are the same. Comparison of “, D3” is performed.

The cross-sectional area S1 of the stranded conductor 1 of the present invention is:
S1 = (π / 4 × d ₂ ² × 7) + (π / 4 × d ₁ ² × 6) + (π / 4 × d ₃ ² × 6) (13)
When formulas (7) and (8) are introduced into formula (13),
S1 = 14.2688 × d ₂ ² (14)
It becomes.

On the other hand, when the diameter of the wire of stranded conductor 101 of the prior art 1 and _{d 4,} the cross-sectional area S2 of the stranded conductor 101,
S2 = π / 4 × d ₄ ² × 19
= 14.9226 × d ₄ ² (15)
It becomes.

The conductor cross-sectional area of the stranded wire conductor 1 and the conductor cross-sectional area of the stranded wire conductor 101 of the prior art 1 are the same from S1 = S2, formulas (14) and (15),
d ₂ = 1.02265 × d ₄ (16)
It becomes.

Accordingly, the outer diameter D1 ′ of the stranded wire conductor 1 is expressed by the equations (10) and (16).
D1 ′ = 4.6427 × d ₂ = 4.747489 × d ₄ (17)
Moreover, the outer diameters D2 ′ and D3 ′ of the stranded wire conductors 101 and 201 of the prior arts 1 and 2 are expressed by the following equations (11) and (12):
D2 ′ = 5 × d ₄ (18)
D3 ′ = 4.85 × d ₄ (19)
It becomes.

  Therefore, even when the conductor cross-sectional areas of the stranded wire conductor 1 and the prior arts 101 and 201 are the same, the relationship D1 ′ <D3 ′ <D2 ′ holds, and the stranded wire conductor 1 of the present invention is the same as that of the prior art 1. It can be seen that the outer diameter can be made thinner by about 5% than the stranded wire conductor 101 and by about 2% than the stranded wire conductor 201 of the prior art 2.

  Since the stranded wire conductor 1 of the present invention has the above-described structure, the following actions and effects are exhibited.

  The outer shape of the stranded wire conductor 1 can be made into a substantially perfect circle shape, and the strands 2, 3, 4 can be brought into contact with all adjacent strands 2, 3, 4.

  The outer shape of the stranded wire conductor 1 is substantially circular, and as described above, the diameter of the stranded wire conductors 101 and 201 of the prior arts 1 and 2 can be reduced, thereby reducing the thickness of the insulation coating. And it can be made substantially uniform, an insulating material can be reduced, and cost can be reduced.

  Further, unlike the stranded wire conductor 201 of the prior art 2, the stranded wire conductor 1 does not allow the strand to pass through a compression die, and therefore, the outer layer strand is not compressed and deformed. Therefore, the physical characteristics of the strands can be maintained without damaging the physical characteristics such as the stretch characteristics, flexibility, and flexibility, and the highly reliable stranded conductor 1 can be obtained.

The diameter d ₂ of the medium diameter wire 3 is 0.103 mm and the diameter d ₁ of the thin diameter wire 2 is d ₁ = 0.82137 × d ₂ = 0. Using three types of strands 2, 3, and 4 with 084 mm and the diameter d _{3 of the} large-diameter wire 4 as d ₃ = 1.08932 × d ₂ = 0.112 mm, as a batch stranded wire at a twist pitch of 4.5 mm A stranded wire conductor 1 was obtained, and this was designated as an implementation product 1. In addition, the material of the strands 2, 3, and 4 is a silver plating annealed copper wire.

The measured value of the outer diameter of the stranded conductor 1 is 0.477 mm, and is a calculated value obtained from the equation (9),
_{D1 = 2 × (d 2/} 2 + d 2 + d 1) = 3d 2 + 2d 1
= 3 x 0.103 + 2 x 0.084 = 0.477 (20)
Matched.

  When the product 1 was observed with a microscope, each strand was in contact with all adjacent strands, and the outer shape thereof was a substantially perfect circle.

In addition, using a 0.103 mm silver-plated annealed copper wire having a diameter d ₂ similar to that of the medium diameter wire as a strand, a twisted wire conductor 101 of prior art 1 is created at a twist pitch of 4.5 mm, and this is compared. Product 1.

In addition, a 0.103 mm silver-plated annealed copper wire having a diameter d ₂ similar to that of the medium diameter wire is used as the element wire, and the twist pitch is 4.5 mm and the compression ratio is 2.5% (diameter ratio). 2 stranded wire conductors 201 were prepared and used as comparative product 2.

  The average elongation percentage of the wires constituting the outer layer of the product 1 was 20.4%. On the other hand, the average elongation rate of the strands constituting the outer layer of the comparative product 1 was 18.3%, and the average elongation rate of the strands constituting the outer layer of the comparative product 2 was 14.6%.

  The elongation rate of the stranded wire conductor 1 of the present invention is about 40% higher than that of the prior art 2 that is compressed because it is not compressed, and is equal to or greater than that of the prior art 1. I found out.

When the diameter d ₂ of the medium diameter wire 3 is 0.184 mm, the diameter d ₁ of the thin diameter wire ₂ that satisfies the relationship of the above formulas (7) and (8) is d ₁ = 0.82137 × d _2. = 0.1511 mm, and the diameter d ₃ of the thick wire 4 is d ₃ = 1.08932 × d ₂ = 0.2005 mm.

  As an implementation product partially different from the above relationship, there are three types of elements: a medium diameter wire 3 having a diameter of 0.184 mm, a thin diameter wire 2 having a diameter of 0.1511 mm, and a large diameter wire 4 having a diameter of 0.2040 mm. Using the wires 2, 3, and 4, a stranded wire conductor 1 was obtained as a collective stranded wire at a twist pitch of 12.5 mm. In addition, the material of the strands 2, 3, and 4 is a tin plating annealed copper wire.

The actually measured value of the outer diameter of this product 2 is 0.854 mm, and is a calculated value obtained from the equation (9),
_{D1 = 2 × (d 2/} 2 + d 2 + d 1) = 3d 2 + 2d 1
= 3 x 0.184 + 2 x 0.1511 = 0.854 (21)
It became.

  When this embodiment product 2 was observed with a microscope, each strand was in contact with all adjacent strands, and the outer shape thereof was a substantially perfect circle.

Further, the diameter of d ₄ = d ₂ /1.02265=0.180 mm (from Expression (16)), which is the same as the conductor cross-sectional area of the stranded wire conductor 101 of the prior art 1 and the conductor cross-sectional area of the implementation product 2, is The stranded wire conductor 101 of the prior art 1 was created at a twist pitch of 12.5 mm using the tin-plated annealed copper wire as a comparative product 3.

The actual measurement value of the maximum outer diameter of the comparative product 3 is 0.892 mm, and the calculated value obtained from the equation (18) is
D2 ′ = 5 × d ₄
= 5 x 0.180 = 0.900 (22)
It was found that the outer diameter of the implementation product 2 was smaller than the maximum outer diameter of the comparison product 3 even when the conductor cross sections of the implementation product 2 and the comparison product 3 were the same.

The cross-sectional view which shows the stranded wire conductor of this invention. The schematic sectional drawing for demonstrating the twisted wire conductor of this invention. The perspective view of the stranded wire conductor of the prior art 1. FIG. The cross-sectional view of the covered wire which coat | covered the twisted wire conductor of the prior art 1 with the insulating material. The cross-sectional view which shows the stranded wire conductor of the prior art 2. FIG.

Explanation of symbols

1 Stranded conductor 2 Thin wire (elementary wire)
3 Medium diameter wire (elementary wire)
4 Thick wire (elementary wire)
5 Valley 11 Central line 1A Inner layer 1B Outer layer

Claims (1)

A center line composed of a single core wire is provided, an inner layer is formed by surrounding the center line with six core wires, and an outer layer is formed by surrounding the outer periphery with 12 core wires. A 19-core stranded conductor,
As said strand, three kinds of thin diameter wires with different diameters, medium diameter wires, and large diameter wires are used,
All the strands constituting the center line and the inner layer are the medium diameter wires,
As the strands constituting the outer layer, the six thin diameter wires thinner than the medium diameter wire and the six thick wires thicker than the medium diameter wire are alternately arranged in the circumferential direction. And
The six-core thin diameter wires are arranged so that the center thereof is located on an extension line connecting the center of the center line and the center of the six-core medium diameter wires constituting the inner layer, and the inner layer is A thick wire is disposed in the valley formed by the outer surfaces of the adjacent medium wires in the 6 wires constituting the medium wire,
Each strand is in contact with all adjacent strands;
A stranded wire conductor characterized in that a distance from the center of the center line to the outermost edge of the thin wire is equal to a distance from the center of the center line to the outermost edge of the thick wire.

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