A three-layer co-extruded insulated shielded cable

Abstract

The utility model relates to low -voltage cable technical field, concretely is a kind of three-layer coextrusion insulated shielded cable, including cable body, cable body includes cable conductor, inner shield layer, insulating layer, outer shield layer, semi-conductive water-blocking tape, copper wire shield layer, copper band wrapping layer, non-conductive water-blocking tape, CPP soft wrapping tape and outer protective layer, inner shield layer is coated in the surface of cable conductor, insulating layer is coated in the surface of inner shield layer, outer shield layer is coated in the surface of insulating layer;With the surface of inner shield layer tightly coated in cable conductor, smooth cable conductor surface burr, uniform cable conductor and insulating layer interface electric field, outer shield layer protects insulating layer, reduces electromagnetic interference to outward spread, inner and outer shield layer synergistic effect, make electric field distribution homogenization, reduce insulating layer breakdown risk, enhance electromagnetic shielding efficiency, reduce partial discharge and aging, improve cable service life.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage cable technology, specifically to a three-layer co-extruded insulated shielded cable. Background Technology

[0002] Low-voltage cables are used to transmit low-voltage signals. Unlike traditional 110 / 220V AC cables, low-voltage cables are typically made of copper and aluminum and use various insulating materials, including PVC, rubber, or fiberglass. They have multiple functions, from controlling remote devices to transmitting data. There are two main types of low-voltage cables: twisted-pair cables and coaxial cables. Twisted-pair cables consist of two intertwined insulated wires and are typically used to transmit data signals. Coaxial cables use a single conductor with an outer insulating material and a metal shielding layer and are typically used to transmit video or radio signals.

[0003] In actual use, existing low-voltage cables with voltage levels of 1.9 / 3.3kV are prone to problems such as electric field concentration between the insulation layer and conductor, which accelerates insulation aging, reduces cable lifespan, and cannot effectively suppress external electromagnetic interference or internal signal leakage, affecting signal transmission stability and the safety of peripheral equipment.

[0004] Therefore, it is necessary to invent a three-layer co-extruded insulated shielded cable to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a three-layer co-extruded insulated shielded cable to solve the problems in the technology of electric field concentration between the insulation layer and the conductor, which accelerates insulation aging, reduces cable service life, and cannot effectively suppress external electromagnetic interference or internal signal leakage, affecting signal transmission stability and the safety of peripheral equipment.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a three-layer co-extruded insulated shielded cable, comprising a cable body, the cable body comprising a cable conductor, an inner shielding layer, an insulation layer, an outer shielding layer, a semi-conductive resistive water tape, a copper wire shielding layer, a copper tape wrapping layer, a non-conductive resistive water tape, a CPP soft wrapping tape, and an outer protective layer, wherein the inner shielding layer covers the surface of the cable conductor, the insulation layer covers the surface of the inner shielding layer, and the outer shielding layer covers the surface of the insulation layer.

[0007] By adopting the above technical solution, the inner shielding layer tightly covers the surface of the cable conductor, smooths the burrs on the surface of the cable conductor, and uniformly distributes the electric field at the interface between the cable conductor and the insulation layer. The outer shielding layer protects the insulation layer and reduces the outward propagation of electromagnetic interference. The inner and outer shielding layers work together to make the electric field distribution uniform, reduce the risk of insulation layer breakdown, enhance electromagnetic shielding effectiveness, reduce partial discharge and aging, and improve the service life of the cable.

[0008] Optionally, both the inner and outer shielding layers are made of cross-linked semi-conductive shielding materials.

[0009] By adopting the above technical solutions, cross-linked semi-conductive shielding materials possess conductivity, shielding properties, and cross-linking characteristics.

[0010] Optionally, the insulating layer is made of cross-linked polyethylene material.

[0011] By adopting the above technical solution, the working temperature of cross-linked polyethylene material can be increased to 90℃, significantly improving the material performance.

[0012] Optionally, the semiconducting resistive water tape is wrapped around the surface of the outer shielding layer.

[0013] By adopting the above technical solution, the semiconducting resistive water creates a uniform electric field on the surface of the insulating layer, preventing partial discharge.

[0014] Optionally, the copper wire shielding layer is wound around the surface of the semiconducting resistive water tape, and the copper tape wrapping layer is wrapped around the surface of the copper wire shielding layer.

[0015] By adopting the above technical solution, the copper wire shielding layer is tightly wrapped around the surface of the semiconducting resistive water tape, and the copper tape wrapping layer is used to reflect and absorb external electromagnetic interference and suppress internal signal leakage.

[0016] Optionally, the non-conductive resistive water tape is wrapped around the surface of the copper wire shielding layer and the copper tape wrapping layer.

[0017] Optionally, the CPP soft tape is wrapped around the surface of the non-conductive water tape.

[0018] By adopting the above technical solution, CPP soft packaging tape is used to bind internal materials and also has a certain degree of flame retardancy.

[0019] Optionally, the outer protective layer is wrapped around the surface of the CPP soft packaging tape, and the outer protective layer is made of weather-resistant polyvinyl chloride.

[0020] By adopting the above technical solution, the outer protective layer made of weather-resistant polyvinyl chloride is used to protect the internal cables. It has strong resistance to ultraviolet corrosion and is not easy to discolor, crack, or age.

[0021] By adopting the above technical solution

[0022] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0023] 1. This utility model utilizes an inner shielding layer that tightly wraps around the surface of the cable conductor, smoothing burrs on the cable conductor surface and uniformizing the electric field at the interface between the cable conductor and the insulation layer. The outer shielding layer protects the insulation layer and reduces the outward propagation of electromagnetic interference. The synergistic effect of the inner and outer shielding layers makes the electric field distribution uniform, reduces the risk of insulation layer breakdown, enhances electromagnetic shielding effectiveness, reduces partial discharge and aging, and extends the service life of the cable.

[0024] 2. This utility model effectively improves the water resistance and flame retardant properties of cables by using a combination of semi-conductive resistance water tape, non-conductive resistance water tape, and CPP soft-pack tape, thereby further enhancing the safety of cable use and expanding the cable's applicability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0027] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Cable body; 11. Cable conductor; 12. Inner shielding layer; 13. Insulation layer; 14. Outer shielding layer; 15. Semi-conductive resistance water tape; 16. Copper wire shielding layer; 17. Copper tape wrapping layer; 18. Non-conductive resistance water tape; 19. CPP soft wrapping tape; 110. Outer protective layer. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0031] This utility model provides, for example Figures 1 to 3 The cable shown is a three-layer co-extruded insulated shielded cable, including a cable body 1. The cable body 1 includes a cable conductor 11, an inner shielding layer 12, an insulation layer 13, an outer shielding layer 14, a semi-conductive resistive water tape 15, a copper wire shielding layer 16, a copper tape wrapping layer 17, a non-conductive resistive water tape 18, a CPP soft wrapping tape 19, and an outer protective layer 110. The inner shielding layer 12 covers the surface of the cable conductor 11, the insulation layer 13 covers the surface of the inner shielding layer 12, and the outer shielding layer 14 covers the surface of the insulation layer 13.

[0032] The inner shielding layer 12 and the outer shielding layer 14 are both made of cross-linked semi-conductive shielding material. The outer shielding layer 14 is a peelable cross-linked semi-conductive shielding material. The insulation layer 13 is made of cross-linked polyethylene material, which effectively and uniformly distributes the electric field at the interface between the cable conductor 11 and the insulation layer 13 and reduces the outward propagation of electromagnetic interference. The inner shielding layer 12, the insulation layer 13 and the outer shielding layer 14 are formed in one step through a co-extrusion production line, which improves the density and production efficiency of the connection mechanism of the inner shielding layer 12, the insulation layer 13 and the outer shielding layer 14.

[0033] See Figure 3 A semi-conductive resistive water tape 15 is wrapped around the surface of the outer shielding layer 14. A copper wire shielding layer 16 is wound around the surface of the semi-conductive resistive water tape 15. A copper strip wrapping layer 17 is wrapped around the surface of the copper wire shielding layer 16. A non-conductive resistive water tape 18 is wrapped around the surfaces of the copper wire shielding layer 16 and the copper strip wrapping layer 17. A CPP soft wrapping tape 19 is wrapped around the surface of the non-conductive resistive water tape 18. An outer protective layer 110 is wrapped around the surface of the CPP soft wrapping tape 19. The outer protective layer 110 is made of weather-resistant polyvinyl chloride.

[0034] In addition, the semiconducting resistive water tape 15 is formed by impregnating and drying the water-blocking tape with semiconducting adhesive. The fibers are fully combed, with high longitudinal strength and low resistance. It plays a role in water blocking, buffering and shielding between the outer shielding layer 14 and the copper wire shielding layer 16. The copper wire shielding layer 16 is wrapped around the surface of the semiconducting resistive water tape 15 by copper wires being woven into a mesh. The copper tape wrapping layer 17 is spirally wound around the surface of the copper wire shielding layer 16. The copper wire shielding layer 16 and the copper tape wrapping layer 17 work together to improve the shielding performance.

[0035] Meanwhile, the non-conductive water-resistant tape 18 acts as a water-blocking buffer and shield between the copper tape wrapping layer 17 and the CPP soft-pack tape 19. The CPP soft-pack tape 19 has good heat resistance and stable and reliable winding performance. It is non-hygroscopic, has good chemical corrosion resistance, good high and medium frequency insulation performance, a wide operating temperature range, low thermal shrinkage rate at high temperatures, and good isolation performance. Moreover, its thickness is only one-quarter of that of non-woven fabric and PVC tape. The winding is tight, reducing the cable diameter, thereby saving material for the outer protective layer 110 and effectively reducing the cable production cost. Furthermore, the outer protective layer 110, made of weather-resistant polyvinyl chloride, has strong resistance to ultraviolet corrosion, is not easy to discolor or crack, and effectively extends the service life of the cable.

[0036] The working principle of this utility model is as follows: The inner shielding layer 12 tightly wraps around the surface of the cable conductor 11, smoothing the burrs on the surface of the cable conductor 11 and uniformly distributing the electric field at the interface between the cable conductor 11 and the insulation layer 13. The outer shielding layer 14 protects the insulation layer 13 and reduces the outward propagation of electromagnetic interference. The inner shielding layer 12 and the outer shielding layer 14 work together to uniformize the electric field distribution, reduce the risk of insulation layer 13 breakdown, enhance electromagnetic shielding effectiveness, reduce partial discharge and aging, and extend the service life of the cable. At the same time, by using semi-conductive resistance water tape 15, non-conductive resistance water tape 18 and CPP soft wrapping tape 19 together, the water resistance and flame retardant properties of the cable are effectively improved, further enhancing the safety of cable use and expanding the cable's adaptability.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A three-layer co-extruded insulated shielded cable, comprising a cable body (1), characterized in that: The cable body (1) includes a cable conductor (11), an inner shielding layer (12), an insulation layer (13), an outer shielding layer (14), a semi-conductive resistive water tape (15), a copper wire shielding layer (16), a copper tape wrapping layer (17), a non-conductive resistive water tape (18), a CPP soft wrapping tape (19), and an outer protective layer (110). The inner shielding layer (12) covers the surface of the cable conductor (11), the insulation layer (13) covers the surface of the inner shielding layer (12), and the outer shielding layer (14) covers the surface of the insulation layer (13). The semiconducting resistive water strip (15) is wrapped around the surface of the outer shielding layer (14); The copper wire shielding layer (16) is wound around the surface of the semiconducting resistive water tape (15), and the copper tape wrapping layer (17) is wrapped around the surface of the copper wire shielding layer (16). The non-conductive water tape (18) is wrapped around the surface of the copper wire shielding layer (16) and the copper tape wrapping layer (17); The CPP soft tape (19) is wrapped around the surface of the non-conductive water tape (18).

2. A three-layer co-extruded insulated shielded electrical cable according to claim 1, characterized in that: Both the inner shielding layer (12) and the outer shielding layer (14) are made of cross-linked semi-conductive shielding material.

3. A three-layer co-extruded insulated shielded electrical cable according to claim 1, characterized in that: The insulating layer (13) is made of cross-linked polyethylene material.

4. A three-layer co-extruded insulated shielded electrical cable according to claim 1, characterized in that: The outer protective layer (110) is wrapped around the surface of the CPP soft packaging tape (19), and the outer protective layer (110) is made of weather-resistant polyvinyl chloride.

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