Special-shaped cold shrink tube for high-voltage overhead cable

Abstract

The utility model relates to cold shrink tube technical field, specifically disclose a special-shaped cold shrink tube for high -voltage overhead cable, including cold shrink tube body, cold shrink tube body is by solid silica gel material integrated moulding, and the cold shrink tube body includes the small diameter section of two ends and the large diameter section of the middle part, the outer wall of large diameter section is evenly provided with at least three elastic protrusions extending along the axial direction, the cross section of elastic protrusion is arc, and the inside of elastic protrusion is embedded with reinforcing framework, the inner wall of small diameter section is provided with elastic locking petal and annular adjusting groove, and elastic locking petal is the wedge shape that inclines inwards, and annular adjusting groove is equipped with at least two, and can adjust the holding strength of elastic locking petal through extrusion. The utility model adopts solid silica gel integrated moulding, and the waterproofness is good, and the insulation performance and the anti -aging property are greatly promoted, simultaneously, adopt the special-shaped structure of small diameter section of two ends collocation middle part large diameter section, and positioning is accurate, and the installation is convenient, effectively solved the traditional cold shrink tube waterproof insulation weak, easy ageing, the installation is difficult and the wind swing electric arc problem.

Description

Technical Field

[0001] This utility model relates to the field of cold shrink tubing technology, specifically to a special-shaped cold shrink tubing for high-voltage overhead cables. Background Technology

[0002] Overhead insulated cables are an upgraded product of traditional bare conductors. They retain the structure of overhead lines, combining convenient power transmission with high power supply reliability from the insulation layer. They are resistant to external interference and easy to maintain, and are widely used in urban power distribution networks, suburban areas, and industrial power transmission and distribution. Their design must meet three requirements: first, to work with insulators to achieve insulation isolation from towers and prevent leakage; second, to possess high mechanical strength to withstand tension, self-weight, and ice and snow loads; and third, to cope with wind swaying, which can easily cause collisions between adjacent cables, insufficient distance between cables and towers, and may also reduce the safety clearance of multiple parallel cables, leading to air breakdown, arcing, and ultimately, faults, tripping, or even equipment damage.

[0003] Existing technologies primarily use cold shrink tubing to protect critical components such as cable joints and terminals, but they have significant shortcomings: First, most products employ a non-integrated molding process, leading to gaps at the joints and weak waterproofing. Moisture penetration not only reduces cable insulation but can also cause leakage risks. Furthermore, some cold shrink tubing uses ordinary elastic materials with poor weather resistance, making them prone to aging and cracking after long-term outdoor use, resulting in diminished protective effects and inability to provide long-term protection for overhead cables. Second, traditional cold shrink tubing is mostly a single cylindrical structure, resulting in poor fit with the diameter-changing parts of overhead cables. Installation requires additional tools for adjustment and positioning, making the process cumbersome and prone to assembly errors, hindering precise fixation. Third, existing cold shrink tubing lacks a suitable structural design to address safety hazards caused by wind-induced cable swaying. It cannot help maintain cable spacing, and wind swaying can easily lead to collisions between adjacent cables, reducing the safety clearance and potentially inducing arcing faults, even causing tripping and equipment damage. This severely impacts the operational stability of overhead cables and fails to meet the current requirements of overhead power transmission and distribution systems for reliable protection, ease of installation, and resilience. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a special-shaped cold shrink tubing for high-voltage overhead cables. It is integrally molded with solid silicone, has good waterproof performance, and significantly improves insulation and anti-aging properties, effectively protecting overhead cables. Furthermore, the special-shaped structure with small diameter sections at both ends and a large diameter section in the middle ensures precise positioning and convenient installation, effectively solving the problems of weak waterproof insulation, easy aging, difficult installation, and wind-induced arcing of traditional cold shrink tubing.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A special-shaped cold shrink tubing for high-voltage overhead cables includes a cold shrink tubing body, which is integrally molded from solid silicone material. The cold shrink tubing body includes small-diameter sections at both ends and a large-diameter section in the middle. At least three axially extending elastic protrusions are evenly arranged on the outer wall of the large-diameter section. The cross-section of the elastic protrusions is arc-shaped, and a reinforcing skeleton is embedded inside the elastic protrusions. The inner wall of the small-diameter section is provided with an elastic locking flap and an annular adjustment groove. The elastic locking flap is wedge-shaped and inclined inward. There are at least two annular adjustment grooves, and the clamping force of the elastic locking flap can be adjusted by squeezing.

[0007] Preferably, the height of the elastic protrusion matches the safety clearance of the overhead cable, and the axial length of the elastic protrusion is consistent with the axial length of the large-diameter section.

[0008] Preferably, the reinforcing skeleton is a cross-shaped metal fiber skeleton, the reinforcing skeleton is made of stainless steel fiber, and the two ends of the reinforcing skeleton are flush with the two ends of the elastic protrusion.

[0009] Preferably, the elastic locking flap is injection molded from silicone and shape memory alloy wire.

[0010] Preferably, the outer diameter of the small diameter section is 23.5-24.5 mm.

[0011] Preferably, the outer diameter of the large-diameter section is 41.5-42.5 mm, and the axial length of the large-diameter section accounts for four-fifths of the total length of the cold shrink tube body.

[0012] The beneficial effects of this invention are as follows: the cold shrink tubing body is integrally molded with solid silicone, eliminating splicing gaps, significantly improving waterproof performance, and preventing water from seeping in and damaging the cable. Solid silicone itself has excellent insulation properties, strengthening cable insulation protection, and its weather resistance effectively improves anti-aging performance, extending the service life of the cold shrink tubing and effectively protecting overhead cables from outdoor environmental corrosion. Simultaneously, the cold shrink tubing adopts a unique structure with small-diameter sections at both ends and a large-diameter section in the middle, allowing for precise adaptation to the diameter-changing parts of the overhead cable during installation. Installation can be completed quickly without additional tools, making operation convenient. This structure also helps maintain cable spacing, reducing collisions between adjacent cables and narrowing of the safety clearance caused by wind swaying, effectively solving the arcing hazard caused by wind swaying and ensuring stable operation of overhead cables. Attached Figure Description

[0013] Figure 1 : This is a cross-sectional structural schematic diagram of an embodiment of the present utility model;

[0014] Figure 2 : This is a schematic diagram of the elastic protrusion cross-sectional structure of an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the small-diameter section cross-sectional structure according to an embodiment of the present invention.

[0016] Explanation of the symbols in the attached diagram: 10-Cold shrink tubing body, 11-Small diameter section, 12-Large diameter section, 13-Elastic protrusion, 14-Reinforcing skeleton, 15-Elastic locking flap, 16-Annular adjustment groove. Detailed Implementation

[0017] To more clearly illustrate the structural features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments:

[0018] This embodiment: as follows Figure 1-3 As shown, a special-shaped cold shrink tubing for high-voltage overhead cables includes a cold shrink tubing body 10. The cold shrink tubing body 10 is made of solid silicone material using a one-time injection molding process, which eliminates splicing gaps, greatly improves waterproof performance, and prevents water from seeping in and damaging the cable. At the same time, the solid silicone material itself has excellent insulation properties, which can strengthen the insulation protection of the cable, and its weather resistance can effectively improve anti-aging performance, extend the service life of the cold shrink tubing, and effectively protect the overhead cable from outdoor environmental corrosion.

[0019] The cold shrink tubing body 10 includes small-diameter sections 11 at both ends and a large-diameter section 12 in the middle. The outer diameter of the small-diameter sections 11 at both ends is 24mm, and the outer diameter of the large-diameter section 12 in the middle is 42mm. The axial length of the large-diameter section 12 accounts for four-fifths of the total length of the cold shrink tubing body 10. The irregular structure of the small-diameter sections 11 at both ends and the large-diameter section 12 in the middle allows for precise adaptation to the diameter-changing parts of overhead cables during installation, achieving precise engagement with the cables and preventing displacement. Furthermore, installation is completed quickly and efficiently using the elasticity of cold shrinkage without the need for additional tools. Installation is complete and operation is convenient, improving construction efficiency. At the same time, since the large diameter section 12 in the middle of the cold shrink tubing body 10 is thicker than the small diameter sections 11 at both ends, a protruding part will be formed on the surface of the cable after installation. The protruding parts on adjacent cables will abut against each other, directly preventing the cables from approaching each other due to wind swing, forming a stable physical distance. It can also help maintain the cable distance, reduce the collision between adjacent cables and the problem of narrowing of the safety gap caused by wind swing, effectively solve the arcing hazard caused by wind swing to the cable, and ensure the stable operation of overhead cables.

[0020] Three axially extending elastic protrusions 13 are evenly arranged on the outer circumference of the large-diameter section 12. The height of the elastic protrusions 13 matches the safety clearance of the overhead cable. The height of the protrusions separates adjacent cables, maintains the cable spacing, avoids direct collision of cables when the wind swings, and solves the hidden danger of wind swing. The axial length of the elastic protrusions 13 is consistent with the axial length of the large-diameter section 12. The cross section of the elastic protrusions 13 is arc-shaped, and a reinforcing skeleton 14 is embedded inside the elastic protrusions 13. The reinforcing skeleton 14 is a cross-shaped metal fiber skeleton made of stainless steel fiber. The two ends of the reinforcing skeleton 14 are flush with the two ends of the elastic protrusions 13. This can effectively enhance the mechanical strength of the elastic protrusions 13 and prevent the elastic protrusions 13 from collapsing due to the weight of the weight when covered by ice and snow. This ensures that the function of maintaining the cable spacing is effective for a long time, rather than only in the ideal environment without load.

[0021] The inner wall of the small-diameter section 11 is provided with an elastic locking flap 15 and an annular adjustment groove 16. The elastic locking flap 15 is injection molded from silicone and shape memory alloy wire. The shape memory alloy wire has the characteristic of maintaining shape stability when the temperature changes, which can avoid the decrease in clamping force due to changes in the performance of silicone. The elastic locking flap 15 is wedge-shaped with an inward tilt. The annular adjustment groove 16 has two grooves, and the clamping force of the elastic locking flap 15 can be adjusted by squeezing. Through the clamping force of the elastic locking flap 15, the cold shrink tube is accurately fixed at the diameter change part of the cable, preventing the cold shrink tube from shifting due to wind. The elastic locking flap 15 has an inward tilt structure. With the annular adjustment groove 16, during maintenance, only reverse force needs to be applied from the end of the cable. The elastic locking flap 15 will naturally open outward due to the tilt angle. It can be disassembled without damaging the cold shrink tube. This solves the problem of traditional cold shrink tubes being difficult to disassemble after installation and requiring replacement with new products for maintenance, reducing later maintenance costs and improving disassembly convenience.

[0022] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Therefore, any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A special-shaped cold shrink tubing for high-voltage overhead cables, comprising a cold shrink tubing body, characterized in that: The cold shrink tubing body is integrally molded from solid silicone material. The cold shrink tubing body includes small diameter sections at both ends and a large diameter section in the middle. At least three axially extending elastic protrusions are evenly arranged on the outer wall of the large diameter section. The cross-section of the elastic protrusion is arc-shaped, and a reinforcing skeleton is embedded inside the elastic protrusion. The inner wall of the small diameter section is provided with an elastic locking flap and an annular adjustment groove. The elastic locking flap is wedge-shaped and inclined inward. There are at least two annular adjustment grooves, and the clamping force of the elastic locking flap can be adjusted by squeezing.

2. The shaped cold shrink tubing for high-voltage overhead cables according to claim 1, characterized in that: The height of the elastic protrusion matches the safety clearance of the overhead cable, and the axial length of the elastic protrusion is consistent with the axial length of the large-diameter section.

3. The shaped cold shrink tubing for high-voltage overhead cables according to claim 1, characterized in that: The reinforcing skeleton is a cross-shaped metal fiber skeleton made of stainless steel fiber, and the two ends of the reinforcing skeleton are flush with the two ends of the elastic protrusion.

4. A special-shaped cold shrink tubing for high-voltage overhead cables according to any one of claims 1-3, characterized in that: The elastic locking flap is injection molded from silicone and shape memory alloy wire.

5. A special-shaped cold shrink tubing for high-voltage overhead cables according to any one of claims 1-3, characterized in that: The outer diameter of the small diameter section is 23.5-24.5mm.

6. A special-shaped cold shrink tubing for high-voltage overhead cables according to any one of claims 1-3, characterized in that: The outer diameter of the large-diameter section is 41.5-42.5mm, and the axial length of the large-diameter section accounts for four-fifths of the total length of the cold shrink tube body.

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