Twisted yarn, and method for manufacturing the twisted yarn

Abstract

Provided are a twisted wire that can significantly exhibit a skin effect and can improve bending characteristics and flexibility, and a method for manufacturing the twisted wire. 【Solution means】 It has an inner layer 6 composed of one or more layers arranged in the same circumferential shape and having a hollow portion 5 inside, and on the outside of this inner layer 6, an outer layer 2 composed of a plurality of first element wires 11 arranged in the same circumferential shape is provided. The first element wires 11 are formed with the same diameter and are formed thinner than the diameter of the element wires 12 that form the outermost layer 3 of the inner layer 6. The number of the first element wires 11 is 7 or more more than the number of the element wires 12 and 13 that form each of the layers 3 and 4 of the inner layer 6.

Description

Technical Field

[0001] The present invention relates to a twisted wire and a method for manufacturing the twisted wire.

Background Art

[0002] In recent years, in the wire and cable market, from the viewpoints of reducing the diameter, weight, and increasing the functionality of wires and cables, as shown in FIG. 6, the first strand 101 is arranged in a circumferential shape so that the cross-section becomes nearly circular and has a hollow portion inside. A first outer layer 102, inside the first outer layer 102, a second strand 103 is arranged in a circumferential shape to form a second outer layer 104, and inside the second outer layer 104, a third strand 105 is arranged in a circumferential shape to form a third outer layer 106, and a twisted wire conductor 110 having a hollow portion 107 formed in a hollow shape inside the third outer layer 106 has been proposed (Patent Document 1).

[0003] The diameter of the first strand 101 constituting the first outer layer 102 is formed larger than the diameter of the second strand 103 constituting the second outer layer 104. Further, the first strand 101 constituting the first outer layer 102 is disposed so as to be located outside the valley portion formed by the second strands 103, 103 that constitute the second outer layer 104 and are adjacent to each other in the circumferential direction.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the stranded conductor 110 of the above prior art, since the diameter of the first strand 101 constituting the first outer layer 102 is formed larger than the diameter of the second strand 103 constituting the second outer layer 104, when a high-frequency current flows, due to the skin effect, the current flowing through the first strand 101 constituting the first outer layer 102 increases. However, because the diameter of the first strand 101 is thick, the electrical resistance of the first strand 101 is large, and the electrical resistance of the entire stranded conductor 110 becomes large, resulting in problems in terms of electrical characteristics and acoustic characteristics.

[0006] Further, in the stranded conductor 110 of the above prior art, the first strand 101 constituting the first outer layer 102 is disposed so as to be located outside the valley portion 109 formed by the second strands 103 and 103 that constitute the second outer layer 104 and are adjacent to each other in the circumferential direction. Therefore, there are problems in terms of bending characteristics and flexibility.

[0007] Therefore, an object of the present invention is to provide a stranded wire that can significantly exhibit the skin effect and improve bending characteristics and flexibility, and a method for manufacturing the stranded wire.

Means for Solving the Problems

[0008] In order to solve the above problems, the present invention has an inner layer composed of one or a plurality of layers arranged in the same circumferential shape and having a hollow portion inside thereof. Outside this inner layer, a single-layer outer layer is provided that is formed by arranging a plurality of first strands in the same circumferential shape. The contact portion between the radially outer edge of the strand in the outermost layer of the inner layer and the radially inner edge of the strand in the strand constituting the outer layer is located on the same circumference, The first strand is composed of the same diameter and is formed thinner than the diameter of the strand constituting the outermost layer of the inner layer. The stranded wire is characterized in that the number of the first strands is 7 or more more than the number of strands constituting each layer of the inner layer.

[0010] Also, the first strand constituting the outer layer may not fall into the outside of the valley portion formed by the outer peripheral surfaces of the adjacent strands that constitutes the outermost layer of the inner layer. The first strand constituting the outer layer may be prevented from falling in.

[0011] Also, the twisting direction of the strands constituting the inner layer may be different from the twisting direction of the first strands constituting the outer layer.

[0012] Also, the twisting direction of the strands constituting the inner layer is the same as the twisting direction of the first strands constituting the outer layer, and the twist pitch of the strands constituting the inner layer and the twist pitch of the first strands constituting the outer layer may be different.

[0013] Also, it has an inner layer composed of one or more layers arranged in the same circumferential shape and having a hollow portion inside, and on the outside of this inner layer, a single-layer outer layer is provided which is formed by arranging a plurality of first strands in the same circumferential shape, The contact portion between the radially outer edge of the strand in the outermost layer of the inner layer and the radially inner edge of the strand in the strand constituting the outer layer is located on the same circumference, The first strands are formed with the same diameter and are thinner than the diameter of the strands constituting the outermost layer of the inner layer, and the number of the first strands is 7 or more more than the number of the strands constituting each layer of the inner layer, A method for manufacturing a twisted wire, characterized in that after forming the inner layer by compressing it from the outside of the outermost layer thereof or without compressing it, the outer layer is formed on the outside of the inner layer.

Advantages of the Invention

[0014] According to the present invention, there is an inner layer composed of one or more layers arranged in the same circumferential shape and having a hollow portion inside, and on the outside of this inner layer, a single-layer outer layer is provided which is formed by arranging a plurality of first strands in the same circumferential shape. The first strands are formed with the same diameter and are thinner than the diameter of the strands constituting the outermost layer of the inner layer, and the number of the first strands is 7 or more more than the number of the strands constituting each layer of the inner layer. Thus, when a high-frequency current flows, even if the current flowing through the first strands constituting the outer layer increases due to the skin effect, the electrical resistance of the current flowing through the first strands is small. Therefore, the skin effect can be made remarkable, and the bending characteristics and flexibility can be improved.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0016] A mode for carrying out the present invention will be described with reference to the drawings.

[0017] [Example 1] FIG. 1 is a cross-sectional view taken in a direction orthogonal to the axial direction of the twisted wire 1 according to Example 1 of the present invention. The hatching indicating the cross-sections of the respective strands is omitted to avoid complication of the drawing.

[0018] The twisted wire 1 can be used as a twisted wire conductor used for electric wires, cables, etc., a catheter tube used for treatment, a guide wire passing through blood vessels, a medical wire such as an operating wire for an endoscope, etc.

[0019] As shown in FIG. 1, the twisted wire 1 is composed of three layers: an outer layer 2 located radially outermost from its center, a first inner layer 3 provided radially inward from the center of the twisted wire 1 in the outer layer 2, and a second inner layer 4 provided radially inward from the center of the twisted wire 1 in the first inner layer 3. A hollow portion 5 is formed radially inward from the center of the twisted wire 1 in the second inner layer 4. The twisted wire 1 is composed of a single-layer outer layer 2 and an inner layer 6 composed of two layers, the first inner layer 3 and the second inner layer 4.

[0020] The outer layer 2 is composed of the first base wires 11, the first inner layer 3 is composed of the second base wires 12, the second inner layer 4 is composed of the third base wires 13, and the stranded wire 1 is composed of three types of base wires 11, 12, and 13. The twisting direction of the first base wires 11 constituting the outer layer 2 and the second base wires 12 constituting the first inner layer 3 are configured to be in different directions. Also, the twisting directions of the second base wires 12 constituting the first inner layer 3 and the third base wires 13 constituting the second inner layer 4 are configured to be the same.

[0021] The twist pitch of the first base wires 11 constituting the outer layer 2 may be the same as, or different from, the twist pitches of the second base wires 12 constituting the first inner layer 3 and the third base wires 13 constituting the second inner layer 4.

[0022] There are 38 first base wires 11, and 15 second base wires 12 and 15 third base wires 13 respectively.

[0023] When the stranded wire 1 is used as a stranded conductor, as the wire materials for the base of each of the base wires 11, 12, and 13, for example, copper wires such as bare copper wires, oxygen-free copper wires, linear crystal oxygen-free copper wires, single crystal high-purity oxygen-free copper wires, those obtained by plating such copper wires with tin, nickel, silver, etc., aluminum wires, various alloy wires, and insulated coated ones such as enameled wires, litz wires, and formal wires can be used.

[0024] When the stranded wire 1 is used as a medical wire, as the wire materials for the base of each of the base wires 11, 12, and 13, for example, hard copper wires, alloy wires, nickel wires, stainless steel wires, titanium wires, etc. can be used.

[0025] The materials of each of the base wires 11, 12, and 13 may be the same or different.

[0026] As shown in FIG. 1, the outer layer 2 is configured by arranging 38 first base wires 11 on the same circumference. The outer layer 2 has a circular cross-section and is composed of first base wires 11 all having the same diameter. The first base wires 11, 11 adjacent to each other in the circumferential direction centered on the center of the stranded wire 1 are arranged so as to be in contact with each other throughout their axial directions or in a part of their axial directions.

[0027] As shown in FIG. 1, the first inner layer 3 is configured by arranging 15 second strands 12 on the same circumference such that adjacent second strands 12, 12 are spaced apart from each other. The first inner layer 3 has a circular cross-section and is composed of second strands 12 all having the same diameter.

[0028] The twisting direction of the first strands 11 constituting the outer layer 2 and the twisting direction of the second strands 12 constituting the first inner layer 3 are configured to be different. Therefore, the first strands 11 are arranged so as not to fall into the valleys 15 between adjacent second strands 12, 12 in the circumferential direction, that is, not to contact the outer surface of the second strands 12 in the valleys 15.

[0029] As a result, the virtual circle formed by the radially inner edges of the strands 1 in each first strand 11 and the virtual circle formed by the radially outer edges of the strands 1 in each second strand 12 are substantially the same. That is, the contact portions between the radially inner edges of the strands 1 in each first strand 11 and the radially outer edges of the strands 1 in the second strands 12 are located on the same circumference.

[0030] The diameter d2 of the second strand 12 is formed larger than the diameter d1 of the first strand 11.

[0031] As shown in FIG. 1, the second inner layer 4 is configured by arranging 15 third strands 13 on the same circumference. The second inner layer 4 has a circular cross-section and is composed of third strands 13 all having the same diameter, and the adjacent third strands 13, 13 in the circumferential direction centered on the center of the strand 1 are arranged so as to contact each other throughout their axial directions or in a part of their axial directions.

[0032] The third strand 13 is arranged so as to contact the adjacent second strands 12, 12 throughout their axial directions or in a part of their axial directions in the inner valley 15 formed by the adjacent second strands 12, 12 in the circumferential direction centered on the center of the strand 1.

[0033] The diameter d3 of the third wire strand 13 is formed to be smaller than the diameter d2 of the second wire strand 12.

[0034] In the first embodiment, the wire strands 11, 12, and 13 in which the relationships of d1 = 0.523×d2 and d3 = 0.694×d2 are satisfied are used.

[0035] Further, the cross-sectional shape of the stranded wire 1 is formed to be substantially circular, that is, the distance L1 from the center of the stranded wire 1 to the outermost edge end of each first wire strand 11 constituting the outer layer 2 is formed to be substantially the same. Also, the distance L2 from the center of the stranded wire 1 to the outermost edge end of each second wire strand 12 constituting the first inner layer 3 is formed to be substantially the same, and the distance L3 from the center of the stranded wire 1 to the outermost edge end of each third wire strand 13 constituting the second inner layer 4 is formed to be substantially the same.

[0036] Also, the distance to the innermost edge end of each first wire strand 11 constituting the outer layer 2 is formed to be substantially the same as the distance L2 to the outermost edge end of each second wire strand 12 constituting the first inner layer 3.

[0037] Next, a method for manufacturing the stranded wire 1 will be described.

[0038] First, an inner layer 6 composed of two layers, the first inner layer 3 and the second inner layer 4, is formed so as to have a hollow portion 5 in the central portion. Next, an outer layer 2 is formed outside the inner layer 6 so as to have a twisting direction different from the twisting direction of the inner layer 6, thereby forming the stranded wire 1.

[0039] Since the stranded wire 1 of the present invention has the above structure, it exhibits the following operations and effects.

[0040] By making the outer shape of the stranded wire 1 substantially circular without compressing it, each wire strand 11, 12, 13 has little reduction in elongation value and does not impair physical properties such as bending characteristics, flexibility, and flexibility, and can maintain the physical properties. Also, even when the inner diameter of the hollow portion 5 is formed large, the shape of the stranded wire 1 can be stably maintained.

[0041] Also, even when each of the individual wires 11, 12, 13 of the twisted wire 1 is made of a stainless steel wire, a titanium wire, or the like, the shape of the twisted wire 1 is stabilized, the wire drawing back is less likely to occur, and the twisted wire 1 can be maintained in a predetermined shape and arrangement.

[0042] Further, by making the diameter d1 of the first individual wire 11 thinner than the diameter d2 of the second individual wire 12 and making the number of the first individual wires 11 seven or more more than the number of the second individual wires 12, a high-frequency current flows, and even if the current flowing through the first individual wires 11 constituting the outer layer 2 increases due to the skin effect, since the electrical resistance of the first individual wires 11 is small, an increase in the electrical resistance of the entire twisted wire 1 can be suppressed, the skin effect can be made remarkable, and the adverse effect due to the skin effect can be reduced as compared with the prior art 1.

[0043] Therefore, the twisted wire 1 can obtain a highly reliable quality and can be effectively utilized in the fields of automotive wires, audio wires, medical fields, and the like.

[0044] In addition, in the above-described Example 1, the twisting direction of the first individual wires 11 constituting the outer layer 2 and the second individual wires 12 constituting the first inner layer 3 are different, and the twisting directions of the second individual wires 12 constituting the first inner layer 3 and the third individual wires 13 constituting the second inner layer 4 are the same, but the twisting directions of the first individual wires 11 constituting the outer layer 2, the second individual wires 12 constituting the first inner layer 3, and the third individual wires 13 constituting the second inner layer 4 may all be the same direction. In that case, the twisting pitch of the first individual wires 11 constituting the outer layer 2 is configured to be different from the twisting pitches of the second individual wires 12 constituting the first inner layer 3 and the third individual wires 13 constituting the second inner layer 4.

[0045] [Example 2] If an arrangement similar to that of the twisted wire 1 in the above-described Example 1 can be formed, in addition to the individual wires having the diameters described in the above-described Example 1, as long as the diameter d2 of the second individual wire 12 is larger than the diameter d1 of the first individual wire 11 and the diameter d3 of the third individual wire 13 is smaller than the diameter d2 of the second individual wire 12, the twisted wire 1 can be configured using individual wires having an arbitrary diameter. Further, it may be compressed from the outside of the outer layer 2 which is the outermost layer in the twisted wire 1. Regarding the compression ratio, it is set arbitrarily.

[0046] Also, after the inner layer 6 constituting the twisted wire 1 is formed by compressing it with a compression die or the like from the outside of the first inner layer 3 which is the outermost layer, an outer layer 2 may be provided outside thereof to form the twisted wire 1.

[0047] Due to this compression, the outer peripheral portion of the first strand 11 constituting the outer layer 2 is compression-deformed, and the outer shape of the twisted wire 1 can be made closer to a perfect circular shape.

[0048] Since other structures are the same as those in the above-described Example 1, the description thereof is omitted.

[0049] Also in this Example 2, the same operational effects as those in the above-described Example 1 can be exhibited.

[0050] [Example 3] In the above-described Examples 1 and 2, the twisted wire 1 was composed of 38 first strands 11, 15 second strands 12, and 15 third strands 13. However, if the number of the second strands 12 and the third strands 13 is made the same, and the number of the first strands 11 is 7 or more greater than the number of the second strands 12, the numbers of the strands 11, 12, and 13 can be set to any numbers respectively.

[0051] The first strand 11, the second strand 12, and the third strand 13 are arranged with the same regularity as in the above-described Examples 1 and 2.

[0052] Since the contact portion between the inner edge in the radial direction of the twisted wire 1 in the first strand 11 and the outer edge in the radial direction of the twisted wire 1 in the second strand 12 is located on the same circumference, when the diameter of the first strand 11 is d1, the diameter of the second strand 12 is d2, the number of the first strands 11 is n, and the number of the second strands 12 is N, the relational expression of d1 = d2×{1 / sin(180 / N)+1} / {1 / sin(180 / n)―1} ··· (1) holds.

[0053] For example, as shown in FIG. 2, in the case of the stranded wire 21 composed of 49 first strands 11, 20 second strands 12, and 20 third strands 13, when n = 49 and N = 20 are substituted into the above formula (1), d1 = d2×{1 / sin(180 / 20)+1} / {1 / sin(180 / 49)―1}=0.506×d2 the relational expression of can be obtained.

[0054] In this way, the relational expression between the diameter d1 of the first strand 11 and the diameter d2 of the second strand 12 can be derived from the number n of the first strands 11 and the number N of the second strands 12.

[0055] Also, by using the wire materials that form the basis of the respective strands 11, 12, and 13 for which the relationships of d1 = 0.506×d2 and d3 = 0.760×d2 hold, the cross-sectional shape of the stranded wire 21 can be made substantially circular with non-compression or a low compression ratio.

[0056] Also, as shown in FIG. 3, in the case of the stranded wire 22 composed of 22 first strands 11, 15 second strands 12, and 15 third strands 13, by using the wire materials that form the basis of the respective strands 11, 12, and 13 for which the relationships of d1 = 0.964×d2 and d3 = 0.694×d2 hold, the cross-sectional shape of the stranded wire 22 can be made substantially circular with non-compression or a low compression ratio.

[0057] Since other structures are the same as those in the above-described first and second embodiments, the description thereof is omitted.

[0058] Also in the third embodiment, the same operational effects as those in the first and second embodiments can be exhibited.

[0059] [Embodiment 4] In the above-described first to third embodiments, the stranded wires 1, 21, and 22 are configured such that the inner layer 6 is composed of two layers, namely the first inner layer 3 and the second inner layer 4, but the inner layer may be composed of one layer or three or more layers. When the inner layer is composed of one layer, it is preferable to manufacture the stranded wire by compressing it from the outside of the first inner layer located on the outermost side of the inner layer using a compression die or the like.

[0060] The outer layer and the inner layer of this embodiment are arranged with the same regularity as in the above Embodiments 1 and 2.

[0061] For example, as shown in FIG. 4, when the inner layer 31 is composed of one layer of the first inner layer 33 made of the second wire 32, and the stranded wire 36 is composed of 38 first wires 11 and 15 second wires 32, by using the wire materials that are the basis of the respective wires 11 and 33 for which the relationship d1 = 0.523 × d2 holds, the cross-sectional shape of the stranded wire 36 can be made substantially circular with non-compression or a low compression ratio.

[0062] Also, as shown in FIG. 5, when the inner layer 31 is composed of one layer of the first inner layer 33 made of the second wire 32, and the stranded wire 37 is composed of 22 first wires 11 and 15 second wires 32, by using the wire materials that are the basis of the respective wires 11 and 33 for which the relationship d1 = 0.964 × d2 holds, the cross-sectional shape of the stranded wire 37 can be made substantially circular with non-compression or a low compression ratio.

[0063] Since the other structures are the same as those in the above Embodiments 1 to 3, the description thereof is omitted.

[0064] Also in this Embodiment 4, the same operational effects as those in the above Embodiments 1 to 3 can be exhibited.

Explanation of Reference Numerals

[0065] 1, 21, 22, 36, 37 stranded wires 2 outer layer 5 hollow part 6, 31 inner layer 11 first wire

Claims

1. The insulating layer is made up of one or more layers arranged on the same circumference and has an inner layer having a hollow space therein, an outer layer is provided on the outside of the inner layer, the outer layer being configured by disposing a plurality of first wires in the same circumferential shape; abutment portion between a radially outer edge of a stranded wire of the wire constituting the outermost layer of the inner layer and a radially inner edge of a stranded wire of the wire constituting the outer layer is located on the same circumference, The first wire is formed to have the same diameter as the wire constituting the outermost layer of the inner layer, and the diameter of the first wire is smaller than that of the wire constituting the outermost layer of the inner layer, The number of the first wires is at least seven more than the number of wires constituting each of the inner layers.

2. The inner layer is an outermost layer of the inner layer, and is provided on the outside of a valley portion formed by the outer peripheral surfaces of the adjacent wires.

2. The stranded wire according to claim 1, wherein the first wires constituting the outer layer do not sag.

3. 3. The stranded wire according to claim 1, wherein the stranding direction of the wires constituting the inner layer is different from the stranding direction of the first wires constituting the outer layer.

4. the twisting direction of the wires constituting the inner layer is the same as the twisting direction of the first wires constituting the outer layer, 3. The stranded wire according to claim 1, wherein a twist pitch of the wires constituting the inner layer is different from a twist pitch of the first wires constituting the outer layer.

5. The insulating layer is made up of one or more layers arranged on the same circumference and has an inner layer having a hollow space therein, an outer layer is provided on the outside of the inner layer, the outer layer being configured by disposing a plurality of first wires in the same circumferential shape; abutment portion between a radially outer edge of a stranded wire of the wire constituting the outermost layer of the inner layer and a radially inner edge of a stranded wire of the wire constituting the outer layer is located on the same circumference, The first wire is formed to have the same diameter as the wire constituting the outermost layer of the inner layer, and the diameter of the first wire is smaller than that of the wire constituting the outermost layer of the inner layer, The number of the first wires is seven or more than the number of wires constituting each layer of the inner layer, A method for manufacturing a stranded wire, comprising forming the inner layer with or without compression from the outside of the outermost layer, and then forming the outer layer on the outside of the inner layer.

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