Connection structure for wire and sleeve and compression device for sleeve

Abstract

To provide a compression device capable of achieving a large insertion amount of a metal sleeve with a relatively small compression force, and a connection structure between the sleeve and wire obtained thereby.SOLUTION: The compression device for a protruding wire connection sleeve includes dies 2, 3 for reducing the diameter of a sleeve 1 and crimping it onto a protruding wire 101, and drive means for the dies 2, 3. The dies 2, 3 include protruding portions 21, 31 that locally compress and reduce the diameter of the sleeve 1 from six sides to form a valley portion 12, and groove portions 22, 32 that form a ridge portion 11, created by material bulging from the sleeve 1 on both circumferential sides during the formation of the valley portion 12.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a connection structure between an electric wire and a sleeve, and a sleeve compression device for obtaining this connection structure. [Background technology]

[0002] Conventionally, in order to reduce wind noise generated when wind blows against an electric wire, a low wind noise electric wire has been developed, such as a protruding electric wire 101 shown in Fig. 9. This protruding electric wire 101 is made by twisting aluminum wires 103 around a steel core 102, and further twisting a plurality of aluminum wires 104a with protrusions and aluminum wires 104b without protrusions as the outermost layer of aluminum wires 104. When fastening the above-mentioned protruding electric wires 101 to a steel tower or connecting the protruding electric wires 101 to each other, a metal sleeve for the protruding electric wire is used (for example, Patent Document 1). Figure 10 shows an example of a dead-end clamp used to fasten a protruding electric wire 101 to a steel tower. This dead-end clamp 50 is composed of a protruding electric wire connection part 51 and a jumper sleeve 52. The protruding electric wire connection part 51 is composed of a steel core connection tube 53 that compressively connects the steel core 102 (Figure 9), and an aluminum sleeve 54. The steel core connection tube 53 is composed of a steel core connection sleeve 53a and a dead-end part 53b formed at the rear end thereof. The sleeve 54 is formed in a substantially cylindrical shape. In the dead-end clamp 50 described above, the protrusion-equipped electric wire 101 is compression-connected using the sleeve 54 as follows. First, a predetermined length of the aluminum wire 103 at the end of the protrusion-equipped electric wire 101 is removed to expose a predetermined length of the steel core 102. Next, the sleeve 54 is previously fitted onto the protrusion-equipped electric wire 101, and the steel core 102 is inserted into the steel core connecting tube 53 for compression connection. Next, the sleeve 54 is moved onto the steel core connecting tube 53, and the sleeve 54 is sequentially compressed along the longitudinal direction by a pair of compression dies into a hexagonal cross section. As a result, the sleeve 54 is compression-connected integrally with the aluminum wires 103, 104. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-250164 Summary of the Invention [Problem to be solved by the invention]

[0004] The sleeve 54 for the protrusion-equipped electric wire 101 is formed in a cylindrical shape with an inner diameter that is approximately equal to the outer diameter of the protrusion-equipped electric wire 101, i.e., the outer diameter of the protrusion-equipped aluminum wire 104a portion, so that the protrusion-equipped electric wire 101 can be inserted. As a result, a gap G is created between the inner periphery of the sleeve 54 and the outer periphery of the protrusion-equipped electric wire 101, the gap G being the difference in outer diameter between the protrusion-equipped aluminum wire 104a portion and the non-protrusion aluminum wire 104b portion (FIG. 9). Therefore, the compression die is required to press the sleeve 54 to an extent that, when driven, it can fill the gap G and bring the inner periphery of the sleeve 54 into close contact with the non-protrusion aluminum wire 104b. The greater the pressing amount, the higher the compression rate and the greater the required surface pressure, and a correspondingly large surface pressure is applied to the die. In order to ensure the necessary surface pressure for compression without increasing the size of the hydraulic compressor, the width of the die (= the compressed length of the sleeve) must be made relatively small, which means that the number of compressions required to achieve the required length increases, reducing workability. Furthermore, if the compression rate increases, the cross-sectional area of ​​the sleeve after crimping decreases, making it impossible to ensure the necessary tensile strength. This issue is also common when crimping other general electric wires and sleeves. Therefore, an object of the present invention is to provide a compression device that can compress a sleeve with a relatively small surface pressure despite a large pushing amount of the sleeve, and that can give the sleeve sufficient tensile strength after compression, and a connection structure between the sleeve and the electric wire obtained thereby. [Means for solving the problem]

[0005] In the following description, reference will be made to the reference numerals in the accompanying drawings, but the present invention is not limited thereto. In order to solve the above problem, in the connection structure of the present invention, the sleeve 1 crimped onto the electric wire 101 has thick-walled ridge portions 11 and thin-walled valley portions 12 of a predetermined length in the axial direction, arranged at predetermined angular intervals in the circumferential direction, and the ridge portions 11 and valley portions 12 are continuous with each other on the outer periphery with curved surfaces, and the inner periphery is in close contact with the outer periphery of the electric wire 101, giving the sleeve 1 a roughly polygonal cross-sectional shape. In order to solve the above problems, the compression device for a sleeve 1 for connecting an electric wire of the present invention comprises dies 2, 3 for reducing the diameter of the sleeve 1 to crimp it onto an electric wire 101, and a drive means for the dies 2, 3. The dies 2, 3 comprise ridge portions 21, 31 for locally compressing and reducing the diameter of the sleeve 1 from six directions to form valley portions 12, and groove portions 22, 32 for forming ridge portions 11 formed by increasing the thickness of the material of the sleeve 1 on both circumferential sides when the valley portions 12 are formed. [Effects of the Invention]

[0006] According to the connection structure between a sleeve and an electric wire of the present invention, the connection portion has sufficient strength, can be easily installed, and can also contribute to energy saving in installation. According to the sleeve compression device of the present invention, the above-described excellent connection structure between the sleeve and the electric wire can be easily obtained even if it is relatively small in size. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view showing a crimping structure of a sleeve and a protruding electric wire according to the present invention; [Figure 2] 2 is a cross-sectional view of the sleeve and the crimped portion of the protruding electric wire in FIG. 1. [Figure 3] FIG. 2 is a perspective view of a die in a sleeve compression device according to the present invention. [Figure 4] FIG. 4 is a side view of the die of FIG. 3. [Figure 5] 5 is a cross-sectional view of FIG. 4 taken along line V-V. [Figure 6] 6 is a cross-sectional view taken along the line VI-VI in FIG. 5. [Figure 7] 10 is a cross-sectional view of a sleeve and a crimped portion of a protruding electric wire according to another embodiment. FIG. [Figure 8]FIG. 10 is a cross-sectional view of a die according to another embodiment. [Figure 9] FIG. 1 is an explanatory diagram showing an example of a protruding electric wire. [Figure 10] FIG. 10 is an explanatory view showing an example of a conventional strain clamp. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described with reference to the drawings. 1 and 2 show a connection structure between a sleeve 1 and a protruding electric wire 101 according to the present invention. In this connection structure, a metal sleeve 1 made of aluminum or the like is crimped onto the outer periphery of the protruding electric wire 101. For example, when the ends of two protruding electric wires 101 are butted together and inserted into the sleeve 1, the two electric wires 101 are joined together within the sleeve 1. The crimped sleeve 1 has thick-walled ridge portions 11 and thin-walled valley portions 12, each having a predetermined length in the axial direction, alternately arranged at 60° intervals in the circumferential direction. The outer peripheries of the ridge portions 11 and valley portions 12 are continuous with each other through curved surfaces, and as shown in FIG. 2, the cross section is roughly shaped like a six-pointed star. The inner periphery of the sleeve 1 is in close contact with the outer periphery of the protruding electric wire 101, up to the aluminum wires 104b without protrusions.

[0009] The crimping of the protruding electric wire 101 to the sleeve 1 is carried out by inserting the protruding electric wire 101 into the sleeve 1, placing it between the dies 2 and 3 shown in Figures 3 to 6, and compressing the dies 2 and 3 using a driving means not shown.

[0010] The dies 2, 3 are provided with ridge portions 21, 31 that form valley portions 12 by largely compressing the sleeve 1 from all directions to reduce its diameter locally, and groove portions 22, 32 that form thick ridge portions 11 by allowing the material to escape to both sides in the circumferential direction when forming the valley portions 12.

[0011] The amount of pressing required to crimp the protrusion-equipped electric wire 101 onto the sleeve 1 can be ensured with a relatively small surface pressure due to local compression by the ridge portions 21, 31. While the ridge portions 21, 31 press the outer periphery of the sleeve 1, a portion of the material of the sleeve 1 is allowed to escape to the groove portions 22, 23, thereby reducing the surface pressure required for compression as a whole. Therefore, it is possible to form dies 2, 3 with a larger compression width at the same surface pressure.

[0012] When the protruding electric wire 101 is joined inside the sleeve 1 by compressing the sleeve 1 with the dies 2 and 3, six thick ridge portions 11 are formed in the axial direction at the joint, which function as ribs, thereby improving the tensile strength.

[0013] Fig. 7 shows a crimped structure of a sleeve 1 and a protruding electric wire 101 according to another embodiment of the present invention. In this crimped structure, the crimped sleeve 1 has thick-walled ridge portions 11a, 11b and thin-walled valley portions 12a, 12b, each having a predetermined length in the axial direction, alternately arranged at 60° intervals in the circumferential direction. However, only the outer peripheries of the four ridge portions 11a located at two diagonal corners and the adjacent valley portions 12a are continuous with each other through curved surfaces. The other two ridge portions 11b are formed between two flat surfaces that join at 120°. As in the previous embodiment, the inner periphery of the sleeve 1 is in close contact with the outer periphery of the protruding electric wire 101, even down to the aluminum wires 104b without protrusions.

[0014] As shown in Figure 8, the dies 2, 3 used to obtain the above-mentioned crimped structure include two ridge portions 21, 31 that form the valley portion 12a of the sleeve 1 in Figure 7, four groove portions 32, 32 that form the thick ridge portion 11a by allowing the material to escape to both circumferential sides when forming the valley portion 12a, and two flat portions 23, 33 that join at 120° to each other on both sides of the joining side of each die 2, 3 so as to form the other two ridge portions 11b of the sleeve 1.

[0015] The above embodiment is merely an example and can be modified as appropriate within the scope of the present invention. For example, in the above embodiment, the crimped sleeve 1 has ridges 11 and valleys 12 at 60° intervals in the circumferential direction, but they can also be spaced at other angles. Also, in the above embodiment, the crimped sleeve 1 has a structure that roughly has a six-pointed star cross section, but the number of ridges 11 and valleys 12 that the crimped sleeve 1 has is not limited to six. Furthermore, the target electric wire is not limited to a wire with protrusions, but includes a general steel-core aluminum stranded wire and other electric wires. [Explanation of symbols]

[0016] 1 sleeve 11 Mausoleum 11a Mausoleum 11b Mausoleum 12 Valley 12a Tanibe 12b Tanibe 2 dice 21 Convex portion 22 Groove 23 Plane part 3 dice 31 Convex portion 32 Groove 33 Plane part 50 Strain clamp 51 Protruding wire connection part 52 Jumper Sleeves 53 Steel core connecting pipe 53a Steel core connecting sleeve 53b Detention part 54 Aluminum sleeve 101 Protruding wire 102 Steel core 103 Aluminum wire (inner layer) 104 Aluminum wire (outer layer) 104a Aluminum wire with projections 104b Aluminum wire without protrusions

Claims

1. An electric wire is inserted into a metallic, generally cylindrical sleeve, and the sleeve is crimped and integrated onto the electric wire. The crimped sleeve has thick ridges and thin valleys that are spaced apart at a predetermined angle in the circumferential direction and have a predetermined length in the axial direction, and the ridges and valleys are continuous with each other on the outer periphery with a curved surface, and the inner periphery is in close contact with the outer periphery of the protruding electric wire, forming a roughly polygonal cross section.

2. An electric wire is inserted into a metallic, generally cylindrical sleeve, and the sleeve is crimped and integrated onto the electric wire. The crimped sleeve has thick ridges and thin valleys that are spaced apart at predetermined angles in the circumferential direction and have a predetermined length in the axial direction, and the outer peripheries of the four ridges and their adjacent valleys located at two diagonal corners are continuous with each other through curved surfaces, and the inner periphery is in close contact with the outer periphery of the electric wire, forming a roughly polygonal cross section.

3. 3. The connection structure between an electric wire and a sleeve according to claim 1, wherein the electric wire is a protruding electric wire, and the sleeve has an approximately cylindrical shape with an inner diameter approximately equal to the outer diameter of the protruding electric wire.

4. A sleeve compression device for obtaining the connection structure between an electric wire and a sleeve according to claim 1 or 2, comprising: The device includes a die that reduces the diameter of the sleeve to crimp it onto the electric wire, and a drive means for the die, The die is characterized by having a convex portion that locally compresses and reduces the diameter of the sleeve from six sides to form the valley portion, and a groove portion that forms the ridge portion by increasing the thickness of the sleeve material on both circumferential sides when the valley portion is formed.

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