Structural conductor for medium-voltage cable
By setting an open angle structure on the outermost special-shaped single line of the medium voltage cable conductor, the slip and protrusion problems caused by too smooth conductor surface is solved, and the tight integration of the conductor and the inner shielding layer of the insulation is achieved, improving the slip force and maintaining other performances of the product.
Patent Information
- Application Number
- CN202421204470.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-05-29
AI Technical Summary
The outermost layer of the existing medium voltage cable conductor is too smooth, resulting in poor adhesion between the insulating inner shielding layer and the conductor, which is prone to slip and the conductor protrudes out of the insulating inner shielding layer.
An open angle structure is provided on the outer arc line of the outermost special-shaped single line, so that the material of the insulating inner shielding layer can penetrate and generate friction, and enhance the bonding force with the conductor.
By enhancing the friction between the insulating inner shielding layer and the conductor, the bonding force between the conductor and the insulating inner shielding layer is improved, and the problems of conductor slipping and protruding out of the insulating inner shielding layer are avoided, while not affecting the cross-sectional area and core deviation of the product.
Smart Images
Figure CN222672636U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cables, in particular to a structural conductor used for medium-voltage cables. Background Art
[0002] In the new era where technology and innovation go hand in hand, cable, as the key cornerstone supporting the efficient operation of modern society, its quality and safety are undoubtedly the top priority to ensure the smooth transmission of national energy and communication.
[0003] The medium voltage cable conductors currently used in the industry mainly include compressed round conductors and compressed special-shaped conductors. The cross-sectional structure of the compressed round conductor is as follows: Figure 1 As shown, the cross-sectional structure of the compressed special-shaped conductor is as follows Figure 2 As shown. Actual production verifies that the above two types of conductors have their own advantages and disadvantages: the compressed round conductor has insufficient bonding between layers, a large outer diameter of the conductor, and material waste; the compressed special-shaped conductor formed by twisting special-shaped monofilaments has tight bonding between layers and a small outer diameter, but the outermost layer of the conductor is too smooth, and the adhesion between it and the insulating inner shielding layer is poor. The slip test force value is about 10% lower than that of the compressed round conductor, and the conductor of the next process is prone to protruding from the insulating inner shielding layer.
[0004] Therefore, there is an urgent need in the art for a new type of structural conductor for medium voltage cables to solve the above problems. Utility Model Content
[0005] The utility model aims to provide a structural conductor for a medium voltage cable to solve the problems existing in the above-mentioned prior art. An open angle structure is arranged on the outermost shaped single wire so that the material of the insulating inner shielding layer can penetrate into the open angle structure, thereby increasing the friction between the insulating inner shielding layer and the outermost shaped single wire to prevent the two from separating from each other.
[0006] To achieve the above purpose, the utility model provides the following solutions:
[0007] The utility model discloses a structural conductor for a medium voltage cable, comprising a central single wire, a plurality of adjacent outer layer structures and an outermost layer structure, wherein the outer side of the central single wire is provided with a plurality of adjacent outer layer structures, the outer side of the adjacent outer layer structure located at the outermost layer is provided with the outermost layer structure, each of the adjacent outer layer structures comprises a plurality of adjacent outer layer special-shaped single wires, each of the adjacent outer layer special-shaped single wires can be twisted into a ring structure, the outermost layer structure comprises a plurality of outermost layer special-shaped single wires, one end of the outer arc line of the outermost layer special-shaped single wire is provided with an open angle structure, and each of the outermost layer special-shaped single wires can form a ring structure.
[0008] Preferably, the cross-section of the central single line is circular.
[0009] Preferably, the cross-section of the outer layer special-shaped single wire is tile-shaped.
[0010] Preferably, the central single wire, the adjacent outer layer structure and the outermost layer structure are made of copper or aluminum.
[0011] Preferably, the outer layer structure is provided with two layers.
[0012] Preferably, the radius of the central single line is 1.28 mm, and the outer diameter of the outermost structure is 3.8 mm;
[0013] The outer arc length of the outermost layer of special-shaped single wire is 3.98 mm, and the inner arc length of the outermost layer of special-shaped single wire is 1.34 mm;
[0014] The height of the open-angle structure is 0.3 mm, and the arc length of the open-angle structure is 0.4 mm.
[0015] Compared with the prior art, the utility model has achieved the following technical effects:
[0016] The utility model opens an open angle structure with a certain arc length and height on the outer arc line of the outermost layer of special-shaped monofilament, ensuring that the material of the insulating inner shielding layer can penetrate into the open angle structure under a certain temperature and extrusion pressure during the production process and generate a certain friction, so that the structural conductor used in the medium-voltage cable and the insulating inner shielding layer can be closely combined to improve the slipping force. The problem in the prior art that the structural conductor of the next process is easy to extend out of the insulating inner shielding layer due to the conductor surface being too smooth is solved, and the cross-sectional area and eccentricity of the product are not affected. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 It is a cross-sectional schematic diagram of a compressed circular conductor in the prior art;
[0019] Figure 2 It is a cross-sectional schematic diagram of a compressed special-shaped conductor in the prior art;
[0020] Figure 3 It is a cross-sectional schematic diagram of a structural conductor used in a medium voltage cable in Example 1;
[0021] Figure 4 It is a cross-sectional view of the outermost shaped single wire in the structural conductor used for the medium voltage cable in the first embodiment;
[0022] In the figure: 1-central single wire; 2-adjacent outer layer structure; 201-adjacent outer layer special-shaped single wire; 3-outermost layer structure; 301-outermost layer special-shaped single wire; 302-open angle structure. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0024] The utility model aims to provide a structural conductor for a medium voltage cable to solve the problems existing in the above-mentioned prior art. An open angle structure is arranged on the outermost shaped single wire so that the material of the insulating inner shielding layer can penetrate into the open angle structure, thereby increasing the friction between the insulating inner shielding layer and the outermost shaped single wire to prevent the two from separating from each other.
[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0026] Embodiment 1
[0027] like Figure 3-Figure 4 As shown, this embodiment provides a structural conductor for a medium voltage cable, including a central single wire 1, a plurality of adjacent outer layer structures 2 and an outermost layer structure 3, a plurality of adjacent outer layer structures 2 are arranged outside the central single wire 1, the plurality of adjacent outer layer structures 2 are arranged sequentially from the inside to the outside, and the diameter increases sequentially from the inside to the outside, and the outermost layer structure 2 is provided with the outermost layer structure 3 outside. Each adjacent outer layer structure 2 includes a plurality of adjacent outer layer special-shaped single wires 201, and each adjacent outer layer special-shaped single wire 201 in each adjacent outer layer structure 2 can be twisted into a ring structure. Similarly, the outermost structure 3 includes a plurality of outermost shaped single wires 301, and an open angle structure 302 is provided at one end of the outer arc line of the outermost shaped single wire 301. The open angle structure 302 can be regarded as a structure formed by an oblique cut along the outer side surface of the outermost shaped single wire 301. Each outermost shaped single wire 301 can form an annular structure, and there is an open angle structure 302 between two adjacent outermost shaped single wires 301.
[0028] In actual use, since one corner of the outermost layer of special-shaped monofilament is designed with an open-angle structure 302 of a certain curvature and height, it is ensured that during the production process, the material of the insulating inner shielding layer can penetrate into the open-angle structure 302 under a certain temperature and extrusion pressure to generate a certain friction. The structural conductor and the inner shielding layer used in the medium-voltage cable can be closely combined to improve the sliding force, thereby solving the problem in the prior art that the conductor surface is too smooth, which makes it easy for the conductor of the next process to extend out of the insulating inner shielding layer. In addition, it does not affect the cross-sectional area and eccentricity of the product.
[0029] In this embodiment, the cross section of the central single wire 1 is circular, that is, the central single wire 1 is a conventional circular conductor single wire.
[0030] In this embodiment, if Figure 3 As shown, the cross section of the outer layer profiled single wire 201 is tile-shaped, which can also be considered as a fan shape. Specifically, it includes an outer arc line and an inner arc line, the outer arc line is located outside the inner arc line and is longer than the inner arc line, and the left and right ends of the outer arc line and the inner arc line are connected by a left straight line and a right straight line respectively.
[0031] It should be noted that the shape of the outermost layer of shaped single wire 301 is basically the same as the shape of the adjacent outer layer of shaped single wire 201. The only difference is that an open angle structure 302 is provided at one end of the outer arc line of the outermost layer of shaped single wire.
[0032] In this embodiment, the materials of the central single wire 1 , the adjacent outer layer structure 2 and the outermost layer structure 3 include but are not limited to copper or aluminum, and those skilled in the art can select them according to actual needs.
[0033] In this embodiment, the outer layer structure 2 has two layers. Of course, those skilled in the art may also provide three or more layers, and the method is not limited to this embodiment.
[0034] In this embodiment, the radius of the central single wire 1 is 1.28 mm, and the outer diameter of the outermost structure 3 is 3.8 mm.
[0035] The outer arc length of the outermost layer of the shaped single wire 301 is 3.98 mm, and the straight-line distance between the two end points of the outer arc of the outermost layer of the shaped single wire 301 is 3.8 mm. The inner arc length of the outermost layer of the shaped single wire 301 is 1.34 mm, and the straight-line distance between the two end points of the inner arc of the outermost layer of the shaped single wire 301 is 1.28 mm.
[0036] like Figure 4 As shown, the height of the open angle structure 302 is 0.3 mm, which is the length of the right straight line cut off from the outermost layer of the special-shaped single wire 301 corresponding to the open angle structure 302. The arc length of the open angle structure 302 is 0.4 mm, which is the length of the outer arc cut off from the outermost layer of the special-shaped single wire 301 corresponding to the open angle structure 302.
[0037] In other embodiments, the dimensions of the central single wire 1 , the adjacent outer layer structure 2 and the outermost layer structure 3 can be adjusted, and different models correspond to different dimensions.
[0038] Embodiment 2
[0039] This embodiment provides a method for producing a structural conductor for a medium voltage cable, which is used to produce the structural conductor for a medium voltage cable in Embodiment 1, comprising the following steps:
[0040] Step 1: The drawing of the center single wire 1, the adjacent outer layer special-shaped single wire 201 and the outermost layer special-shaped single wire 301 is completed by a rolling head die-piercing machine. The rolling head die-piercing machine is also called a point rolling machine. Since it is a prior art, its specific structure will not be described in detail. The working process is described below by taking the outermost layer special-shaped single wire 301 as an example:
[0041] Arrange the prepared dies according to their through-hole sizes from large to small, and first extend the copper (or aluminum) rod to be drawn between the two rollers in the head milling machine for sharpening. The copper (or aluminum) rod that has been reduced in size passes its sharpened end through the first die, and the wire is placed in the wire drawing part of the head milling machine. The end that is not inserted into the die is clamped with a clamp, and the die will be stuck in the corresponding groove. The wire is wound on the roller of the sharpening machine. During the rotation of the roller of the sharpening machine, the product will pass through the die from one end until the other end completely passes through the die, thereby completing the first wire drawing of the wire and removing the wire from the drum of the sharpening machine. Then continue with the second sharpening, the wire after the second sharpening passes through the second die, and then the roller of the head mill is used to pull out the wire, thereby completing the second wire drawing. Repeat several times to make the wire pass through dies of different apertures in turn. It should be noted that the last wire drawing die uses a special die with an open angle.
[0042] The wire drawing process for the center single wire 1 and the outer layer special-shaped single wire 201 is the same, except that the molds are different, so it will not be described here one by one.
[0043] Step 2: Install the wire-drawing-formed center single wire 1, the outermost layer shaped single wire 201 and the outermost layer shaped single wire 301 on a twisting machine, so as to twist the center single wire 1, the outermost layer structure 2 and the outermost layer structure 3, and obtain the final product.
[0044] The present embodiment adopts a frame stranding machine in a stranding machine, which is also a prior art, including a wire drum frame, a wire splitter, a wire doubling die, a compression die, a traction machine and a wire take-up reel. Among them, the traction machine includes a traction line and a traction wheel. One end of the traction line is passed through the edge hole of the traction wheel and the end is tied tightly, and it is wound around the traction wheel for 5-7 turns (according to the specification size of the production line core). Driven by the traction machine, the copper wires in the wire drum frame pass through the wire splitter, pass through the wire doubling die, and are finally collected in the wire take-up reel. Of course, the working principles of different types of stranding machines are slightly different, so only the general principles are explained here, and no further details are given. It should be particularly noted that the outermost layer of the special-shaped single wire 201 is twisted by the wire doubling die, and the outermost layer of the special-shaped single wire 301 is twisted by the compression die. The compression die can be understood as a kind of wire doubling die. Since the outermost layer of the special-shaped single wire 301 has an additional open angle structure 302, it is necessary to use a compression die that matches its shape for twisting.
[0045] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A structural conductor for a medium voltage cable, characterized in that: It comprises a central single wire, a plurality of adjacent outer layer structures and an outermost layer structure, wherein a plurality of adjacent outer layer structures are arranged on the outer side of the central single wire, and the outermost layer structure is arranged on the outer side of the adjacent outer layer structure located at the outermost layer, each of the adjacent outer layer structures comprises a plurality of adjacent outer layer special-shaped single wires, and each of the adjacent outer layer special-shaped single wires can be twisted into a ring structure, and the outermost layer structure comprises a plurality of outermost layer special-shaped single wires, and an open angle structure is arranged at one end of the outer arc line of the outermost layer special-shaped single wire, and each of the outermost layer special-shaped single wires can form a ring structure.
2. The structural conductor for medium voltage cable according to claim 1, characterized in that: The cross section of the central single line is circular.
3. The structural conductor for medium voltage cable according to claim 1, characterized in that: The cross section of the outer layer special-shaped single wire is tile-shaped.
4. The structural conductor for medium voltage cable according to claim 1, characterized in that: The central single wire, the adjacent outer layer structure and the outermost layer structure are made of copper or aluminum.
5. The structural conductor for medium voltage cable according to claim 1, characterized in that: The outer layer structure has two layers.
6. The structural conductor for medium voltage cable according to claim 1, characterized in that: The radius of the central single line is 1.28 mm, and the outer diameter of the outermost structure is 3.8 mm; The outer arc length of the outermost layer of special-shaped single wire is 3.98 mm, and the inner arc length of the outermost layer of special-shaped single wire is 1.34 mm; The height of the open-angle structure is 0.3 mm, and the arc length of the open-angle structure is 0.4 mm.