A wear and tear resistant shielded ground wire

Abstract

The utility model relates to the field of wire and cable manufacturing, especially to a wear -resisting, tear -resistant type shielding ground wire, this ground wire is from the outside to the inside in proper order for the sheath layer, shielding layer, tape layer, insulating layer and conductor, the sheath layer is the sheath layer made of thermoplastic polyurethane elastomer, the tape layer is polyester tape, the insulating layer is made of polyvinyl chloride material, the conductor is made of the stranding of many tinned soft copper wires.

Description

Technical Field

[0001] This utility model relates to the field of electronic packaging technology, specifically to a wear-resistant and tear-resistant shielded grounding wire. Background Technology

[0002] Shielded grounding wires, as a type of signal line, are used in various electrical equipment in the modern electrical field. Shielded grounding wires not only mitigate safety hazards and equipment malfunctions caused by voltage gradients resulting from large-area grounding of equipment, but also isolate interference signals, maintain signal quality and accuracy, and ensure the normal operation of the power system.

[0003] Currently, most shielded grounding wires for distribution cabinets on the market are copper core, low-smoke halogen-free polyolefin sheathed, or copper core, PVC sheathed products. Substation distribution cabinets are mostly installed outdoors. Due to significant regional climate differences, the sealing of the distribution cabinets deteriorates with environmental aging, and the shielded grounding wires may be exposed to humid, acidic, or alkaline environments for extended periods. Copper core shielded grounding wires are prone to conductor oxidation, affecting power system operation. Furthermore, if low-smoke halogen-free or PVC sheathed materials are used for the shielded grounding wires, the cable sheaths are easily damaged by dragging or impacts during installation, affecting the long-term safety of the cables.

[0004] CN109859880B discloses a one-piece molded metal-shielded flexible rubber-sheathed cable with a reinforcing layer and a wear-resistant layer. The cable includes a wear-resistant layer, a reinforcing layer, a total metal shielding layer, an outer cable core, and an inner cable core. The inner cable core includes three insulated power cores and three ground cores twisted in a left-hand direction, and a first insulating and water-blocking wrapping layer wrapped around the twisted structure formed by the insulated power cores and ground cores. The outer cable core includes seven sets of shielded control cores and two to seven sets of instrument signal cores twisted in a left-hand direction around the inner cable core. The outer cable core also includes a second insulating and water-blocking wrapping layer and a total metal shielding layer, which are sequentially wrapped around the outside of the twisted structure formed by the shielded control cores and instrument signal cores from the inside out. The wear-resistant layer includes an outer wear-resistant sheath layer and an inner wear-resistant sheath layer. The reinforcing layer is a braided mesh layer embedded between the outer and inner wear-resistant sheath layers. The insulated power cores are twisted in a left-hand direction around the inner cable core. The cable sheath is formed by stranding a first-class tin-plated soft conductor, a conductor isolation layer, a first insulation layer, a first insulation and water-blocking wrapping layer, and a first metal shielding reinforcement layer. A reinforcement layer is placed between the inner and outer wear-resistant sheath layers. This reinforcement layer and wear-resistant layer are formed in one piece, effectively improving the cable sheath's tensile strength, torsional strength, non-delamination, and excellent mechanical properties. This further prevents the conductor core from breaking under tensile stress, thereby reducing damage to the insulated power and control conductor cores. Chlorosulfonated polyethylene is used as the cable sheath layer. Utilizing the excellent physical and mechanical properties of chlorosulfonated polyethylene rubber, the cable's heat aging resistance, weather aging resistance, moisture resistance, oil resistance, and chemical resistance are effectively increased. Hexagonal boron nitride is added to the rubber compound formulation to improve its wear resistance. Natural rubber is added to improve its cold resistance and extrusion processing performance. Silica is added to improve its tear resistance.

[0005] CN202322269375.5 discloses a high-strength wear-resistant flexible cable, comprising: conductive cores and an outer sheath. The conductive cores are multiple groups, each consisting of multiple strands of soft copper wire or tin-plated soft copper wire, an inner sheath layer, an insulation layer, and an outer sheath layer. The inner sheath layer is disposed outside the multiple strands of soft copper wire or tin-plated soft copper wire, and the insulation layer is disposed between the inner and outer sheath layers. Filler cores are provided between the multiple groups of conductive cores, and the outer sheath is disposed outside the multiple groups of conductive cores and filler cores. This invention uses multiple small-diameter soft copper wires or tin-plated soft copper wires stranded together to form conductive cores, improving the conductor's bending resistance and tensile strength. Flame-retardant filler ropes or hemp ropes and rubber strips are provided between the conductive cores as secondary reinforcement. The outer sheath has excellent elasticity, ensuring the cable has excellent electrical performance, flexible bending performance, mechanical properties, and high wear resistance.

[0006] The aforementioned cables utilize reinforcing rope filling between conductive cores to improve the tensile strength of the entire flexible cable. However, increasing the filling material may lead to an excessively large bending radius, reducing the product's flexibility, bendability, and mobility. While the direct extrusion sheath structure outside the cable core is simple to manufacture, it cannot isolate interference signals and maintain signal quality and accuracy during signal transmission. Utility Model Content

[0007] In view of the problems of poor wear resistance and tear resistance of existing grounding wires and inability to isolate interference signals, this utility model provides a wear-resistant and tear-resistant shielded grounding wire, which has the advantages of being soft, wear-resistant and tear-resistant.

[0008] This utility model is achieved through the following technical solution: A wear-resistant and tear-resistant shielded grounding wire, comprising, from the outside to the inside, a sheath layer, a shield layer, a wrapping layer, an insulation layer, and a conductor. The sheath layer is made of thermoplastic polyurethane elastomer, the wrapping layer is made of polyester tape, the insulation layer is made of polyvinyl chloride, and the conductor is made of multiple strands of tinned soft copper wire.

[0009] Preferably, the diameter of the tin-plated soft copper wire is no greater than 0.25 mm.

[0010] Preferably, the thickness of the insulating layer is not less than 0.8 mm.

[0011] Preferably, the wrapping layer adopts a vertical wrapping method.

[0012] Preferably, the shielding layer is a copper wire braided shielding structure.

[0013] Preferably, the weaving density of the shielding layer is not less than 80%.

[0014] Preferably, the thickness of the sheath layer is not less than 1.2 mm.

[0015] Preferably, the sheath layer is extruded from thermoplastic polyurethane elastomer cable material, and the extruder uses a tube-type die for production.

[0016] Preferably, the Shore hardness of the thermoplastic polyurethane elastomer is not higher than 88A.

[0017] Preferably, the sheath layer has a withstand voltage of not less than 1500V.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This utility model discloses a wear-resistant and tear-resistant shielded grounding wire that uses tin-plated soft copper wire stranded conductor to improve the conductor's bending resistance and tensile strength. This is because the stranded structure of the tin-plated soft copper wire can disperse stress and prevent the conductor from breaking due to excessive local stress. The product is flexible and has good mobility.

[0019] The insulation layer is made of polyvinyl chloride (PVC), which has excellent insulation properties, effectively preventing current leakage and ensuring the safe and reliable operation of the grounding wire under normal operating voltage. It also has high heat resistance and chemical corrosion resistance, maintaining stable performance under various environmental conditions. At high temperatures, the PVC insulation layer will not soften or deform, ensuring the electrical performance of the grounding wire remains unaffected; it also resists corrosion when exposed to certain chemicals, extending the service life of the grounding wire.

[0020] The wrapping layer is placed on the outside of the insulation layer. The wrapping layer is made of polyester tape. The strength and toughness of the polyester tape are used to wrap the insulation layer, which can fix and protect the insulation layer.

[0021] The copper wire braided shielding layer covering the outer layer of the tape can isolate interference signals and maintain signal quality and accuracy.

[0022] The extruded sheath layer has high mechanical strength and good wear resistance, making it suitable for harsh environments with frequent pulling, dragging, or reciprocating motion. The extruder uses a tube-type die for production, resulting in a smooth and round product. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a wear-resistant and tear-resistant shielded grounding wire according to the present invention.

[0024] In the diagram, 1 is the conductor; 2 is the insulation layer; 3 is the wrapping tape layer; 4 is the shielding layer; and 5 is the sheath layer. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments. The description is for explanation and not limitation of the present invention.

[0026] This utility model discloses a wear-resistant and tear-resistant shielded grounding wire, referring to... Figure 1 The grounding wire consists of, from the outside to the inside, a sheath layer 5, a shielding layer 4, a wrapping layer 3, an insulation layer 2, and a conductor 1.

[0027] In one embodiment, the sheath layer 5 is made of thermoplastic polyurethane elastomer. Specifically, the sheath layer 5 is extruded from thermoplastic polyurethane elastomer cable material. The Shore hardness of the thermoplastic polyurethane elastomer is not higher than 88A, and the extruder uses a tube-type die for production. This is because thermoplastic polyurethane elastomer has excellent wear resistance and tear resistance, and can resist friction, scratching, and pulling from the external environment, thus giving the connecting wire wear-resistant and tear-resistant characteristics. Using a tube-type die for production ensures that the sheath layer 5 uniformly wraps the internal structure and forms a smooth and round shape.

[0028] In one embodiment, the thickness of the sheath layer 5 is not less than 1.2 mm. A reasonable thickness setting can provide sufficient protection for the internal structure (conductor 1, shielding layer 4, wrapping layer 3 and insulation layer 2), and improve the safety and reliability of the grounding wire.

[0029] In one embodiment, the sheath layer 5 has a withstand voltage of not less than 1500V. Sufficient withstand voltage is to ensure that the sheath layer 5 will not be broken down, thus ensuring the electrical safety of the grounding wire.

[0030] In one embodiment, the insulating layer 2 is made of polyvinyl chloride (PVC). PVC not only meets the insulation performance requirements but also meets the manufacturing economic requirements, which can reduce production costs.

[0031] In one embodiment, the thickness of the insulating layer 2 is not less than 0.8 mm. Limiting the thickness of the insulating layer 2 can not only meet the structural strength requirements, but also ensure that it is not broken down, so that the grounding wire meets the requirements of reliable insulation and electrical safety.

[0032] In one embodiment, the wrapping layer 3 is a polyester tape, which can fix and protect the insulation layer 2, preventing the insulation layer 2 from being damaged during production, transportation and use.

[0033] In one embodiment, the wrapping layer 3 adopts a longitudinal wrapping method, which is simple in process, has a stable product structure, and can be automated in production.

[0034] In one embodiment, the shielding layer 4 is a copper wire braided shielding structure, which uses copper wire braided mesh to isolate external electromagnetic interference signals and prevent interference signals from entering, thereby ensuring the stability and accuracy of the signal.

[0035] In one embodiment, the braiding density of the shielding layer 4 is not less than 80%. The braiding density affects the shielding effect of the shielding layer 4. Here, it is to satisfy the shielding effect of the shielding layer 4 as much as possible, while also satisfying the flexibility of the grounding wire.

[0036] In one embodiment, conductor 1 is made of multiple strands of tin-plated soft copper wire, and the diameter of the tin-plated soft copper wire is no more than 0.25mm. The material and size of conductor 1 are optimized simultaneously to meet the bending resistance and tensile strength of the grounding wire.

[0037] This utility model discloses a wear-resistant and tear-resistant shielded grounding wire, which adopts a tin-plated soft copper wire stranded conductor 1, polyvinyl chloride insulation, polyester tape wrapping layer 3, copper wire braided shielding layer 4, and high-performance sheath layer 5, and is produced by extrusion die process, so that it has the required bending resistance, tensile strength, electrical performance, shielding performance and wear resistance.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the technical solution of the present utility model in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present utility model, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A wear-resistant and tear-resistant shielded grounding wire, characterized in that, The grounding wire consists of a sheath layer (5), a shield layer (4), a wrapping layer (3), an insulation layer (2), and a conductor (1) from the outside to the inside. The sheath layer (5) is made of thermoplastic polyurethane elastomer. The wrapping layer (3) is made of polyester tape and is wrapped longitudinally. The insulation layer (2) is made of polyvinyl chloride. The conductor (1) is made of multiple strands of tinned soft copper wires with a wire diameter of no more than 0.25 mm. The shield layer (4) is a copper wire braided shield structure with a braiding density of no less than 80%. The sheath layer (5) is extruded from thermoplastic polyurethane elastomer cable material using a tube extrusion die.

2. The wear-resistant and tear-resistant shielded grounding wire according to claim 1, characterized in that, The thickness of the insulating layer (2) is not less than 0.8 mm.

3. The wear-resistant and tear-resistant shielded grounding wire according to claim 1, characterized in that, The thickness of the sheath layer (5) is not less than 1.2 mm.

4. The wear-resistant and tear-resistant shielded grounding wire according to claim 1, characterized in that, The Shore hardness of the thermoplastic polyurethane elastomer is not higher than 88A.

5. The wear-resistant and tear-resistant shielded grounding wire according to claim 1, characterized in that, The sheath layer (5) has a withstand voltage of not less than 1500V.

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