Wire core capable of preventing torsion damage
By setting longitudinal convex ribs on the surface of the stranded conductor and fitting with the insulating sleeve, the problem of damage to the insulating sleeve under repeated twisting of the cable core is solved, and uniform torque bearing of the insulating sleeve is achieved and cracking is prevented.
Patent Information
- Application Number
- CN202422258091.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-13
AI Technical Summary
When the cable core repeatedly bears forward and reverse torque, the insulating sleeve is easily damaged, resulting in local cracking.
The longitudinal convex ribs are provided on the surface of the stranded conductor, and the insulating sleeve is fitted with it. The longitudinal convex ribs are distributed in an equal manner in the circumference of the top radius to the root radius are 1.1 to 1.5 to ensure that the insulating sleeve is uniformly subjected to torque.
It prevents local circumferential displacement and slight cracking of the insulating sleeve, improves the suitability of the wire core under repeated twisting, and the insulating sleeve is not easy to tear.
Smart Images
Figure CN223245307U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric wires and cables, in particular to a wire core that is resistant to torsion damage. Background Art
[0002] In certain circumstances, cables need to work under conditions of continuous twisting or intermittent twisting at a certain angle. For example, cables that supply power to swinging electrical devices and cables on wind turbines. The core of the cable is composed of a cylindrical stranded conductor and an insulating sheath outside the stranded conductor. Here, in order to adapt to torsional deformation, the conductor that bears torsion must be a stranded conductor made of conductive wires twisted together. The stranded conductor serves as an electrical connection device, and its two ends are fixed to different electrical equipment. The torque generated by the position change of the two electrical equipment on the cable is applied to the stranded conductor, and the torsional deformation of the stranded conductor will be transmitted to the insulating sheath. Between the stranded conductor and the insulating sleeve, the stranded conductor is actively twisted, while the insulating sleeve is passively twisted. Because the stranded conductor is made of spirally twisted copper wire, small spiral grooves will naturally form on the surface of the stranded conductor, and the encapsulated insulating sleeve will be embedded in these small grooves. This tiny embedded structure will produce locally concentrated tearing stress when the insulating sleeve is repeatedly twisted in the forward and reverse directions. That is, when the stranded conductor transmits torque to the insulating sleeve, the embedded part will exert tension on the other parts. The tiny crack at the junction of the embedded part and the other parts will slowly expand, eventually causing the insulating sleeve to crack in the longitudinal direction, resulting in damage to the wire core. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a wire core which is resistant to torsion damage, so that the insulating sleeve is not easily damaged when the wire core is repeatedly subjected to positive and reverse torsion.
[0004] The technical solution adopted by the utility model to solve the technical problem is: a wire core that is resistant to torsion damage, comprising a bundled conductor and an insulating sleeve that wraps the bundled conductor, wherein the bundled conductor is formed by twisting a plurality of metal conductive wires, and a plurality of longitudinal ribs are integrally provided on the surface of the bundled conductor, wherein the longitudinal ribs are evenly distributed in the circumferential direction;
[0005] On the cross section of the bundled conductor, the top of the longitudinal ribs is in the shape of a raised arc, and the roots formed by connecting adjacent longitudinal ribs are in the shape of a concave arc.
[0006] The inner surface of the insulating sleeve is in contact with the outer surface of the bundled conductor.
[0007] Specifically, the bundled conductor is a bundled body with the longitudinal ribs on the surface, which is drawn from a cylindrical bundled body through a forming die.
[0008] Specifically, in order not to destroy the bundled structure of the twisted conductor, facilitate the processing of the longitudinal ribs and enable the insulating sleeve to evenly withstand torsion, on the cross-section of the twisted conductor, the distance from the highest point of the top of the longitudinal rib to the axis of the twisted conductor is the top radius, and the distance from the lowest point of the connection root of adjacent longitudinal ribs to the axis of the twisted conductor is the root radius. The ratio of the top radius to the root radius is 1.1 to 1.5.
[0009] Specifically, in order to make the torsion borne by the insulating sleeve more uniform, the number of the longitudinal ribs is 5 or more.
[0010] The beneficial effects of the present invention are as follows: the wire core of the present invention provides the bundled conductor with longitudinal ribs, the insulating sleeve tightly wraps the bundled conductor, and the process of forming the longitudinal ribs makes the surface of the bundled conductor smoother, so that the insulating sleeve as a whole can withstand torsion, thereby preventing local circumferential displacement of the bundled conductor and the insulating sleeve, thereby preventing micro-cracks caused by such local circumferential displacement and the embedding of the insulating sleeve into the bundled conductor. Preventing the formation of micro-cracks can significantly improve the applicability of the wire core under repeated positive and reverse torsion, and the insulating sleeve is not easy to tear. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a cross-sectional schematic diagram of the present utility model;
[0012] Figure 2 It is a schematic diagram of the bundled stranded conductor in the present invention.
[0013] In the figure: 1. Twisted conductor; 1-1. Longitudinal rib; 2. Insulating sleeve. DETAILED DESCRIPTION
[0014] The technical solutions in the embodiments of the present invention are described in detail below in conjunction with the accompanying drawings of the present invention specification.
[0015] As attached Figure 1 A torsional damage-resistant wire core, shown in the figure, comprises a stranded conductor 1 and an insulating sheath 2 surrounding the stranded conductor 1. The stranded conductor 1 is formed by twisting a plurality of metal conductive wires. Five longitudinal ribs 1-1 are integrally formed on the surface of the stranded conductor 1. The longitudinal ribs 1-1 are evenly distributed around the circumference. The metal conductive wires used in the stranded conductor 1 are copper or aluminum wires.
[0016] In the cross section of the bundled conductor 1, the top of the longitudinal rib 1-1 is in the shape of a protruding arc, and the roots of adjacent longitudinal ribs 1-1 are in the shape of a concave arc.
[0017] The inner surface of the insulating sleeve 2 is in contact with the outer surface of the stranded conductor 1 .
[0018] As attached Figure 2The bundled conductor 1 is a bundled body with longitudinal ribs 1-1 on the surface drawn from a cylindrical bundled body through a forming die. The length direction of the longitudinal ribs 1-1 is roughly in the same direction as the axis of the bundled conductor 1.
[0019] On the cross section of the stranded conductor 1, the distance from the highest point of the top of the longitudinal rib 1-1 to the axis of the stranded conductor 1 is the top radius R1, and the distance from the lowest point of the connection root of adjacent longitudinal ribs 1-1 to the axis of the stranded conductor 1 is the root radius R2. The ratio of the top radius R1 to the root radius R2 is 1.1 to 1.5.
[0020] Of course, the number of longitudinal ribs 1-1 may be more than 5.
[0021] The manufacturing process of the present invention can be that the bundled conductor 1 produced on the bundle stranding machine is further introduced into at least one drawing die to extrude and form the external longitudinal ribs 1-1, and is annealed online, or annealed after winding, and then the bundled conductor 1 is enclosed with an insulating sleeve 2 by an extruder.
[0022] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.
Claims
1. A torsion-resistant wire core comprising a stranded conductor and an insulating sheath surrounding the stranded conductor, wherein the stranded conductor is formed by twisting a plurality of metal conductive wires, and wherein: The surface of the bundled conductor is integrally provided with a plurality of longitudinal ribs, and the longitudinal ribs are evenly distributed in the circumferential direction; On the cross section of the bundled conductor, the top of the longitudinal ribs is in the shape of a raised arc, and the roots formed by connecting adjacent longitudinal ribs are in the shape of a concave arc. The inner surface of the insulating sleeve is in contact with the outer surface of the bundled conductor.
2. The anti-torsion damage wire core according to claim 1, characterized in that: The bundled conductor is a bundled body with longitudinal ribs on the surface, which is formed by drawing a cylindrical bundled body through a forming die.
3. The anti-torsion damage wire core according to claim 1, characterized in that: On the cross section of the stranded conductor, the distance from the highest point of the top of the longitudinal rib to the axis of the stranded conductor is the top radius, and the distance from the lowest point of the connecting roots of adjacent longitudinal ribs to the axis of the stranded conductor is the root radius. The ratio of the top radius to the root radius is 1.1 to 1.
5.
4. The anti-torsion damage wire core according to claim 1, characterized in that: The number of the longitudinal ribs is 5 or more.