Flexible tensile concentric conductor cable

Abstract

The utility model discloses a flexible tensile concentric conductor cable comprising an inner conductor, the inner conductor is wrapped by a semi-conductive nylon tape, the semi-conductive nylon tape is extruded by a high-tear-resistance and high-electrical-performance silicone rubber insulating layer, the high-tear-resistance and high-electrical-performance silicone rubber insulating layer is wrapped by a polyether-ether-ketone film, and the polyether-ether-ketone film is extruded by an outer sheath. An outer conductor is arranged outside the polyether-ether-ketone film, a PET polyester tape and a PP foaming tape are successively wrapped outside the outer conductor to form a double-layer wrapping tape layer, a tensile layer is wrapped outside the PP foaming tape, a reinforced non-woven fabric is wrapped outside the tensile layer, and an outer sheath is extruded outside the reinforced non-woven fabric. The cable has excellent flexibility and tensile property, good moisture resistance, hydrolysis resistance and flame retardance, is environment-friendly, low-smoke and low-toxicity, can be laid under narrow and severe environment conditions and can operate safely and stably for a long time, and the service life of the cable is ensured.

Description

Technical Field

[0001] The utility model relates to the field of power cables, and particularly to a flexible tensile concentric conductor cable. Background Art

[0002] In recent years, with the continuous development of China's power grid construction, electrical equipment, military and other fields, concentric conductor cables have been widely used, and the complexity of the cable use conditions has also put forward higher requirements for their performance. Currently, the common concentric conductor cables are generally plastic cables. Usually, the inner conductor adopts a class 2 stranded structure, and a single-strand metal wire is wound around the insulating core as the outer conductor. They have poor soft bending performance, lack of tensile performance, low temperature resistance grade, and large laying strength. In some special application scenarios, the existing cables cannot meet the use requirements. Content of the Utility Model

[0003] In order to overcome the deficiencies in the prior art, the utility model provides a flexible tensile concentric conductor cable, which has excellent soft and tensile properties, good moisture resistance, hydrolysis resistance and flame retardancy, and is also environmentally friendly, low-smoke and low-toxic, meeting the laying and long-term safe and stable operation under narrow and harsh environmental conditions.

[0004] To achieve the above object, the utility model provides a flexible tensile concentric conductor cable, including an inner conductor, an outer semi-conductive nylon tape is wrapped around the inner conductor, a high tear-resistant and high electrical performance silicone rubber insulating layer is extruded around the semi-conductive nylon tape, a polyether ether ketone film is wrapped around the high tear-resistant and high electrical performance silicone rubber insulating layer, an outer conductor is arranged outside the polyether ether ketone film, a double-layer tape layer is formed by successively wrapping a PET polyester tape and a PP foamed tape outside the outer conductor, a tensile layer is wrapped outside the PP foamed tape, a reinforced non-woven fabric is wrapped outside the tensile layer, and an outer sheath is extruded outside the reinforced non-woven fabric.

[0005] Further, the inner conductor is stranded by multiple strands of wires in a "1 + 6 + 12 + 18" distribution pattern.

[0006] Further, the outer conductor is formed by multiple strands of wires tightly wound around the polyether ether ketone film.

[0007] Further, the stranded wire is stranded by multiple annealed soft copper wires with a diameter of 0.15 mm.

[0008] Further, the tensile layer is woven by mixing non-magnetic low-carbon fine steel wires and carbon fiber wires, and the weaving density is not less than 60%.

[0009] Further, the outer sheath is extruded with polyaryletherethernitrile plastic.

[0010] Further, the reinforced non-woven fabric is composed of a non-woven fabric and a polyester film.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. The inner conductor of the present utility model adopts a soft structure, which is composed of annealed soft copper wires with a diameter of 0.15 mm stranded into a bunch stranding unit. The bunch stranding unit is stranded into a strand at one time, and the strand is stranded into an inner conductor at the second time. As is well known, the smaller the diameter of a single wire of the same material, the higher its tensile strength. This process structure not only endows the inner conductor with excellent flexibility and bending performance, but also effectively enhances the tensile performance of the inner conductor, and is especially suitable for large-section cables.

[0013] 2. The insulation of the present utility model is extruded with high tear-resistant and high electrical performance silicone rubber, which has good flexibility and elasticity, and further improves the flexibility of the cable. It also has good tensile strength, tear strength and outstanding high and low temperature resistance, enabling the cable to operate stably for a long time between -40°C and +180°C. The maximum allowable operating temperature of the cable is increased from the existing common 90°C to 180°C, and the current-carrying capacity of the cable is effectively improved. In addition, its excellent insulation performance, dielectric performance, moisture-proof and waterproof performance, good weather resistance, aging resistance, oil and chemical reagent resistance effectively improve the electrical insulation performance of the cable and ensure the service life of the cable.

[0014] 3. The insulation layer of the present utility model is coated with a polyetheretherketone film. This material has high mechanical strength, wear resistance, fatigue resistance and impact resistance, and can effectively protect the potential damage of the outer conductor copper wire to the insulation layer during the production, laying or use process, thus improving the service life of the cable. Moreover, polyetheretherketone has good electrical insulation performance and maintains it in a very high temperature range, as well as good flame retardancy, acid and alkali resistance, hydrolysis resistance and radiation resistance, further improving the electrical insulation and safety stability of the cable.

[0015] 4. The outer conductor of the present utility model also adopts a soft structure, which is composed of annealed soft copper wires with a diameter of 0.15 mm stranded into a bunch stranding unit. The bunch stranding unit is stranded into a strand, and multiple strands are tightly wound around the polyetheretherketone film as the outer conductor. And the maximum DC resistance between the outer conductor and the inner conductor at 20°C should be the same. This process structure not only endows the outer conductor with excellent flexibility and bending performance, but also further enhances the tensile performance of the outer conductor.

[0016] 5. The outer conductor of the present utility model is respectively coated with a PET polyester tape and a PP foamed tape; the inner layer PET polyester tape has a temperature resistance of 180°C, has high mechanical strength and excellent insulation shielding performance; the outer layer PP foamed tape has a light specific gravity, good longitudinal tensile strength, environmental protection and good heat resistance; the winding structure of the double-layer tape also enhances the electrical insulation performance between the outer conductor and the tensile layer.

[0017] 6. The tensile layer of the present utility model is made by mixing and weaving non-magnetic low-carbon fine steel wires and carbon fiber filaments, and the weaving density is not less than 60%. The specific gravity of the carbon fiber filaments is less than 1 / 4 of that of steel, the tensile strength is more than 7 to 9 times that of steel, and the tensile elastic modulus is also higher than that of steel. At the same time, it is resistant to high temperature, with a softening point of 367 - 370 °C, and the long-term allowable use temperature is above 200 °C. When mixed and woven with non-magnetic low-carbon fine steel wires, it effectively improves the longitudinal tensile performance of the cable and also improves the radial protection of the cable.

[0018] 7. The outer sheath of the present utility model uses polyaryletherethernitrile, which belongs to high-temperature resistant thermoplastic plastics, has a relatively high glass transition temperature (175 °C) and melting point (353 °C), and the heat distortion temperature under load is as high as 260 °C. It can be used under pressure for a long time at 230 °C, and has high strength, high modulus, high fracture toughness and excellent dimensional stability. The flexural strength at 200 °C is about 24 MPa, and the flexural strength and compressive strength are still 10 MPa at 250 °C. It has excellent chemical resistance, fatigue resistance, wear resistance, insulation and hydrolysis resistance, and at the same time has flame retardancy, low toxicity and low smoke, and radiation resistance. It further enhances the high-temperature resistance performance, mechanical performance, hydrolysis resistance performance and environmental protection performance of the cable.

[0019] In summary, the present utility model has excellent flexibility and tensile properties, good moisture resistance and hydrolysis resistance, and flame retardancy. At the same time, it is environmentally friendly, low in smoke and toxicity, meets the laying and long-term safe and stable operation under narrow and harsh environmental conditions, and ensures the service life of the cable. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the present utility model. Detailed Embodiments

[0021] Next, in combination with the drawings and specific embodiments, the present utility model will be further clarified. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. After reading the present utility model, various equivalent modifications of the present utility model by those skilled in the art fall within the scope defined by the appended claims of this application.

[0022] Such as Figure 1As shown in the figure, the utility model provides a flexible tensile concentric conductor cable, which includes an inner conductor 1. The inner conductor is coated with a semi-conductive nylon tape 2. It has a small resistance, semi-conductive characteristics, can effectively weaken the electric field strength, has high mechanical strength, is easy to bind the conductors of various power cables, has good heat resistance, high instantaneous temperature resistance, and the cable can maintain stable performance at high instantaneous temperatures; outside the semi-conductive nylon tape, a high tear-resistant and high electrical performance silicone rubber insulation layer 3 is extruded to form an insulated wire core; the high tear-resistant and high electrical performance silicone rubber insulation layer has good flexibility and elasticity, further improving the flexibility of the cable; and it has good tensile strength, tear strength and outstanding high and low temperature resistance, enabling the cable to operate stably for a long time between -40°C and +180°C. The maximum allowable working temperature of the cable is increased from the existing common 90°C to 180°C, and the current-carrying capacity of the cable is effectively improved; in addition, its excellent insulation performance, dielectric performance and moisture-proof and waterproof performance, good weather resistance, aging resistance, oil and chemical reagent resistance effectively improve the electrical insulation performance of the cable and ensure the service life of the cable.

[0023] In this embodiment, the inner conductor 1 is stranded by multiple strands of wires in a "1+6+12+18" distribution method. The strands of wires are stranded by multiple bundles of wires in a "1+6" distribution method. The bundles of wires are stranded by multiple annealed soft copper wires with a diameter of 0.15 mm; for the same material, the smaller the diameter of the single wire, the higher its tensile strength; this process structure not only makes the inner conductor have excellent flexibility and bending performance, but also effectively enhances the tensile performance of the inner conductor, and is especially suitable for large cross-section cables.

[0024] The high tear-resistant and high electrical performance silicone rubber insulation layer is coated with a polyether ether ketone film 4, which has high mechanical strength, wear resistance, fatigue resistance and impact resistance, can effectively protect the potential damage of the outer conductor copper wire to the insulation layer during production, laying or use, and improves the service life of the cable; moreover, polyether ether ketone has good electrical insulation performance and maintains it in a very high temperature range, as well as good flame retardant, acid and alkali resistance, hydrolysis resistance and radiation resistance and other characteristics, further improving the electrical insulation and safety stability of the cable.

[0025] An outer conductor 5 is provided outside the polyether ether ketone film. The outer conductor is formed by multiple strands of wires tightly wound outside the polyether ether ketone film; the strands of wires are stranded by multiple bundles of wires in a "1+6" distribution method. The bundles of wires are stranded by multiple annealed soft copper wires with a diameter of 0.15 mm; and the maximum DC resistance between the outer conductor and the inner conductor at 20°C should be the same; this process structure not only makes the outer conductor have excellent flexibility and bending performance, but also further enhances the tensile performance of the outer conductor.

[0026] The outer conductor is successively coated with a PET polyester tape 6 and a PP foamed tape 7 to form a double-layer tape wrapping layer. The inner PET polyester tape can withstand a temperature of 180°C, has high mechanical strength, and excellent insulation and shielding performance. The outer PP foamed tape has a light specific gravity, good longitudinal tensile strength, environmental friendliness, and good heat resistance. The use of the double-layer tape wrapping structure also enhances the electrical insulation performance between the outer conductor and the tensile layer.

[0027] The PP foamed tape is externally coated with a tensile layer 8, and the tensile layer is formed by the mixed braiding of non-magnetic low-carbon fine steel wires and carbon fiber filaments. The braiding density is not less than 60%. The specific gravity of the carbon fiber filaments is less than 1 / 4 of that of steel, the tensile strength is more than 7 to 9 times that of steel, and the tensile elastic modulus is also higher than that of steel. At the same time, it is resistant to high temperatures, with a softening point of 367 - 370°C, and the long-term allowable use temperature is above 200°C. When mixed and braided with non-magnetic low-carbon fine steel wires, it effectively improves the longitudinal tensile performance of the cable and also improves the radial protection of the cable.

[0028] The tensile layer is externally coated with a reinforced non-woven fabric 9, which is composed of the composite of non-woven fabric and polyester film. Compared with the single non-woven fabric in the existing cable structure, it enhances the insulation performance and tensile strength, and the stability is greatly improved. Compared with the single polyester tape in the existing cable structure, it also increases the softness.

[0029] Finally, an outer sheath 10 is extruded outside the reinforced non-woven fabric. The outer sheath 10 is made of polyaryletheretherketone plastic by extrusion. It has a relatively high glass transition temperature (175°C) and melting point (353°C), a heat distortion temperature under load as high as 260°C, and can be used under pressure for a long time at 230°C. Moreover, it has high strength, high modulus, high fracture toughness, and excellent dimensional stability; the flexural strength at 200°C is about 24 MPa, and the flexural strength and compressive strength are still 10 MPa at 250°C; and it has excellent chemical resistance, fatigue resistance, wear resistance, insulation, and hydrolysis resistance, and at the same time has flame retardancy, low toxicity and low smoke, and radiation resistance; it further enhances the high-temperature resistance performance, mechanical performance, hydrolysis resistance performance, and environmental protection performance of the cable.

[0030] In summary, through the above design, the utility model is resistant to high temperatures, has excellent softness and tensile performance, good moisture resistance and hydrolysis resistance, and flame retardancy. At the same time, it is environmentally friendly, low-smoke and low-toxic, meets the laying and long-term safe and stable operation under narrow and harsh environmental conditions, and ensures the service life of the cable.

[0031] There are many specific application ways for the utility model. The above description is only the preferred implementation mode of the utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the utility model, several improvements can still be made, and these improvements should also be regarded as the protection scope of the utility model.

Claims

1. A flexible tensile-resistant concentric conductor cable, characterized in that: It comprises an inner conductor, the inner conductor is coated with a semi-conductive nylon tape, the semi-conductive nylon tape is extruded with a high-tear resistance and high-electrical performance silicone rubber insulation layer, the high-tear resistance and high-electrical performance silicone rubber insulation layer is coated with a polyetheretherketone film, an outer conductor is arranged outside the polyetheretherketone film, the outer conductor is successively coated with a PET polyester tape and a PP foam tape to form a double-layer wrapping layer, the PP foam tape is coated with a tensile layer, the tensile layer is coated with a reinforced non-woven fabric, and the reinforced non-woven fabric is extruded with an outer sheath.

2. A flexible tensile-resistant concentric conductor cable according to claim 1, characterized in that: The inner conductor is formed by twisting a plurality of strands in a "1+6+12+18" distribution manner.

3. A flexible tensile-resistant concentric conductor cable according to claim 1, characterized in that: The outer conductor is formed by a plurality of strands tightly wound around the polyetheretherketone film.

4. A flexible tensile-resistant concentric conductor cable according to claim 2 or 3, characterized in that: The strands are formed by twisting multiple bundles of wires in a "1+6" distribution manner.

5. A flexible tensile-resistant concentric conductor cable according to claim 4, characterized in that: The wire bundle is formed by twisting a plurality of annealed soft copper wires with a diameter of 0.15 mm.

6. A flexible tensile-resistant concentric conductor cable according to claim 1, characterized in that: The tensile layer is formed by mixing and weaving non-magnetic low-carbon fine steel wires and carbon fiber wires, and the weaving density is not less than 60%.

7. A flexible tensile-resistant concentric conductor cable according to claim 1, characterized in that: The outer sheath is made of polyarylether ether nitrile plastic by extrusion.

8. The flexible tensile-resistant concentric conductor cable according to claim 1, characterized in that: The reinforced non-woven fabric is composited with non-woven fabric and polyester film.

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