An anti-interference and moisture-proof power cable and control cable combined cable

Abstract

The application relates to the technical field of composite cables, in particular to an anti-interference and moisture-proof power cable and control cable combined cable, which comprises a cable main body, a power line core group and a control line core group arranged in parallel in an eccentric manner are arranged in the cable main body, the two groups of line cores are separated by arc-shaped insulation isolation strips, an inner shielding layer is wrapped around the periphery of the power line core group, an outer shielding layer is wrapped around the periphery of the control line core group, and the arc-shaped insulation isolation strips separate the two shielding layers to insulate them from each other. Through the structural design of the eccentric partition arrangement and the arc-shaped isolation strips to physically separate the double-layer shielding, and the process of reinforcing and consolidating the cables independently before shielding and filling after shielding, the effective electromagnetic isolation of strong and weak currents and multiple comprehensive protection are realized, and the technical problems of the traditional combined cable, such as serious electromagnetic crosstalk, loose cabling and poor moisture-proof capability, are solved.

Description

Technical Field

[0001] This invention relates to the field of composite cable technology, and in particular to a combination cable of anti-interference and moisture-proof power cable and control cable. Background Technology

[0002] Currently, in electrical construction scenarios such as industrial automation, municipal engineering, rail transit, and intelligent buildings, power supply cables and signal control cables are mostly laid separately and wired separately. This method has problems such as cumbersome construction procedures, large space occupation, low cable tray utilization, high material costs, and difficulties in subsequent operation and maintenance. Conventional separate cables have limited protective performance and are prone to insulation aging, damage, and leakage under complex working conditions such as humidity, dust, and mechanical compression. Existing power control cables have significant shortcomings: low-frequency electromagnetic radiation generated by energized power conductors directly couples and interferes with the weak electrical signals of control conductors, causing signal jitter, data distortion, and transmission delays; the cables lack internal rigid isolation, have a rudimentary cabling structure, and are prone to relative displacement between conductors, resulting in poor pressure and bending resistance; their moisture-proof structure is simplistic, relying solely on ordinary filling and sealing without longitudinal water-blocking structures, allowing moisture to easily penetrate longitudinally along the cable core during underground laying; the shielding structure is inadequate, with strong and weak current shielding layers easily coming into close contact, causing electromagnetic crosstalk; and the outer sheath is mostly a single layer, with poor heat insulation, flame retardancy, and wear resistance, leading to a short service life in harsh environments. Therefore, providing a combined cable with zoned shielding for strong and weak currents, eccentric isolation arrangement, pre-shielding cabling reinforcement, shielding before filling, and multi-layer protection is a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that existing composite cables suffer from severe interference between strong and weak electrical currents, poor moisture and seepage prevention capabilities, loose cabling that is prone to slippage, low mechanical strength, simple outer sheath layer, and insufficient protection capabilities.

[0004] The technical solution adopted by this invention to solve its technical problem is: an anti-interference and moisture-proof power cable and control cable combination cable, including a cable body, the cable body having a core assembly layer, a layered shielding layer and a protective layer arranged sequentially from the inside to the outside; the core assembly layer includes a power core group and a control core group, the power core group and the control core group are arranged eccentrically side by side and an arc-shaped insulating isolation strip is provided between them; the layered shielding layer includes an inner shielding layer covering the outer periphery of the power core group and an outer shielding layer covering the outer periphery of the control core group, the arc-shaped insulating isolation strip separating the inner shielding layer and the outer shielding layer.

[0005] Furthermore, the power conductor cores are independently cabled before shielding processing, with a power cable filling layer inside the cable-forming gaps and power wrapping tape wrapped around and secured on the outside; the control conductor cores are independently cabled before shielding processing, with a control cable filling layer inside the cable-forming gaps and control wrapping tape wrapped around and secured on the outside.

[0006] Furthermore, the outer side of the layered shielding layer is wrapped with a combined filling and sealing layer, which is filled with a mixture of filling rope and water-blocking sealant, and water-blocking yarn is embedded longitudinally in the gap.

[0007] Furthermore, an inner lining buffer layer and an armor reinforcement layer are provided between the layered shielding layer and the protective layer. The inner lining buffer layer is an elastic buffer layer, and the armor reinforcement layer adopts a steel strip spiral wrapping structure. The inner and outer surfaces of the armor reinforcement layer are coated with anti-corrosion adhesive.

[0008] Furthermore, the protective layer consists of a heat insulation layer, a flame retardant layer, and a wear-resistant protective layer arranged sequentially from the inside out.

[0009] Furthermore, the power conductor core assembly includes one or more power conductors and a power insulation layer extruded onto the outside of the power conductors. The power conductors are made of multiple strands of oxygen-free copper wire, with a conductor cross-sectional area of ​​4–25 mm². 2 The electrical insulation layer is made of cross-linked polyethylene insulation material with a thickness of 1.2 to 2.0 mm.

[0010] Furthermore, the control conductor assembly consists of several stranded control conductors and a control insulation layer extruded onto the outside of the control conductors. The control conductors are made of tin-plated copper wire with a stranded structure, and the cross-sectional area of ​​a single control conductor is 0.5–2.5 mm². 2 The number of control conductor groups is 4 to 12, and the control insulation layer is made of high-density polyethylene insulation material.

[0011] Furthermore, the inner shielding layer is a soft copper strip wrapped shielding layer with a wrapping overlap rate of not less than 15%; the outer shielding layer is a tin-plated copper wire braided shielding layer with a braiding density of not less than 85%; both the inner and outer shielding layers are set with single-end grounding; the arc-shaped insulating isolation strip is made of high-elastic flame-retardant EPDM rubber with a thickness of 2.0 to 3.0 mm.

[0012] Furthermore, the water-blocking sealant is composed of the following raw materials in parts by weight: 45-55 parts polyolefin resin, 15-20 parts hydrogenated petroleum resin, 10-15 parts flame-retardant filler, 5-8 parts hydrophobic additive, and 2-3 parts anti-aging additive; the thickness of the heat insulation layer is 0.20-0.35 mm, the thickness of the flame-retardant layer is 0.8-1.5 mm, and the thickness of the wear-resistant protective layer is 1.0-2.0 mm.

[0013] The beneficial effects of this invention are as follows: the power conductor core group and the control conductor core group are arranged eccentrically side by side, and the arc-shaped insulating isolation strip separates the inner and outer double-layer shielding, effectively blocking strong and weak electromagnetic coupling interference, without the need for additional insulating isolation pads; the independent cabling is filled, wrapped and reinforced before shielding, resulting in high conductor structure stability and no deviation when laid in bends; the combined filling and sealing layer, together with water-blocking yarn, forms multiple water-blocking defenses, providing excellent moisture-proof and seepage-proof performance; the steel tape armor and anti-corrosion coating layer enhance mechanical strength and corrosion resistance; the heat-insulating, flame-retardant, and wear-resistant multi-layer outer sheath reinforces the cable's long service life in harsh environments such as damp burial and heavy-load compression. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of the cable body.

[0016] Figure 2 This is a process flow diagram of the present invention.

[0017] Explanation of reference numerals in the attached drawings: 1. Electrical conductor; 2. Electrical insulation layer; 3. Control conductor; 4. Control insulation layer; 5. Electrical cabling filler layer; 6. Electrical wrapping tape; 7. Control cabling filler layer; 8. Control wrapping tape; 9. Inner shielding layer; 10. Outer shielding layer; 11. Arc-shaped insulating isolation strip; 12. Combined filling and sealing layer; 13. Inner lining buffer layer; 14. Armored reinforcement layer; 15. Anti-corrosion coating layer; 16. Heat insulation layer; 17. Flame retardant layer; 18. Wear-resistant protective layer. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0019] like Figure 1 As shown, an anti-interference and moisture-proof power cable and control cable combination cable are provided. The cable body, from the inside out, consists of a core assembly layer, a cabling filling layer, a wrapping tape, a layered shielding layer, a combined filling and sealing layer 12, an inner buffer layer 13, an armor reinforcement layer 14, and a protective layer. The core assembly layer includes a power core group and a control core group. The power core group includes one or more power conductors 1, which are made of multiple strands of oxygen-free copper wire with a cross-sectional area of ​​4-25 mm². 2 The outer side is covered with a cross-linked polyethylene electrical insulation layer 2, with a thickness of 1.2–2.0 mm; the control conductor core group consists of several stranded control conductors 3 and control insulation layers 4. The control conductors 3 are made of tin-plated copper wire stranded together, with a cross-sectional area of ​​0.5–2.5 mm². 2The control insulation layer 4 is made of high-density polyethylene. The power conductor core group and the control conductor core group are arranged eccentrically side by side. The power conductor core group is located eccentrically side by side and its overall cross-section is larger than that of the control conductor core group. An arc-shaped insulating isolation strip 11 is set between the two. The material is high-elastic flame-retardant EPDM rubber with a thickness of 2.0-3.0mm. The cross-section is an arc-shaped bonding structure, and the two sides are bonded to the outer walls of the two sets of cable cores.

[0020] Before shielding, the power conductor cores are independently cabled, with a power cable filling layer 5 inside the cable-forming gaps and a power cable wrapping tape 6 wrapped around the outside for securing. The control conductor cores are also independently cabled before shielding, with a control cable filling layer 7 inside the cable-forming gaps and a control cable wrapping tape 8 wrapped around the outside for securing. Both the power cable filling layer 5 and the control cable filling layer 7 are filled with flexible, flame-retardant polypropylene filler rope, ensuring full coverage without gaps. Both the power cable wrapping tape 6 and the control cable wrapping tape 8 are wrapped with polyester non-woven fabric, with an overlap rate of 12%–20%. The layered shielding includes an inner shielding layer 9 and an outer shielding layer 10. The inner shielding layer 9 is a soft copper strip wrapped shielding layer with an overlap rate of not less than 15%, wrapped separately on the outside of the power cable wrapping tape 6. The outer shielding layer 10 is a tin-plated copper wire braided shielding layer with a braid density of not less than 85%, wrapped separately on the outside of the control cable wrapping tape 8. An arc-shaped insulating barrier strip 11 is sandwiched between the two sets of cable cores, using its own thickness to separate the inner shielding layer 9 and the outer shielding layer 10, so that the two shielding layers are mutually insulated and non-conductive, without the need for an additional insulating barrier pad. Both the inner shielding layer 9 and the outer shielding layer 10 adopt a single-end grounding method.

[0021] The combined filling and sealing layer 12 is wrapped around the outside of the layered shielding layer. It is filled with a mixture of modified flame-retardant filling rope and high-polymer water-blocking sealant, with water-blocking yarns embedded longitudinally in the gaps, thus filling and shaping the two sets of shielded cable cores as a whole. The modified water-blocking sealant is composed of the following raw materials in parts by weight: 45-55 parts of polyolefin resin, 15-20 parts of hydrogenated petroleum resin, 10-15 parts of flame-retardant filler, 5-8 parts of hydrophobic additives, and 2-3 parts of anti-aging additives. The inner lining buffer layer 13 is a microporous elastic buffer rubber layer. The micropores have an irregular closed-cell foam structure with a pore size of 2-4 μm, a closed-cell rate of not less than 92%, a Shore hardness of 60-75 HA, and a thickness of 1.5-2.5 mm.

[0022] The armor reinforcement layer 14 adopts a galvanized steel strip spiral wrapping structure, with a steel strip thickness of 0.8–1.2 mm, a wrapping angle of 30–45 degrees, and an overlap width of not less than 1 / 10 of the steel strip width. The inner and outer surfaces of the armor reinforcement layer 14 are coated with an anti-corrosion adhesive layer 15, with a thickness of 0.10–0.20 mm. From the inside out, the protective layer consists of a heat insulation layer 16, a flame retardant layer 17, and a wear-resistant protective layer 18. The heat insulation layer 16 is wrapped with fiberglass insulation tape, with a thickness of 0.20–0.35 mm; the flame retardant layer 17 is a low-smoke halogen-free flame-retardant polyolefin layer, with a thickness of 0.8–1.5 mm; and the wear-resistant protective layer 18 is made of modified weather-resistant low-smoke halogen-free polyolefin material, with a thickness of 1.0–2.0 mm.

[0023] like Figure 2 As shown, the preparation method of the present invention includes: S1, conductor preparation: oxygen-free copper wire and tin-plated copper wire are stranded in multiple layers, and burrs and sharp corners are removed by grinding; S2, insulation extrusion: the insulation material is uniformly extruded onto the outside of the conductor using a high-temperature extruder, the extrusion temperature of cross-linked polyethylene is 130-145 degrees Celsius, and it is cooled and shaped by constant temperature water cooling; S3, independent cabling: the power core and control core are stranded separately into a cable, the gaps are filled with flame-retardant filler rope, and the outer side is wrapped and tied with wrapping tape; S4, core grouping and arrangement: the completed power cable core and control cable core are arranged eccentrically side by side, and the arc-shaped insulating isolation strip 11 is clamped in the middle for fixation; S5, shielding coating. S6. Buffer Covering: Extruding microporous elastic buffer rubber layer; S7. Armoring Reinforcement: Coating anti-corrosion adhesive layer 15 with a thickness of 0.10-0.20mm, and spirally wrapping armor with galvanized steel strip; S8. Outer Sheath Processing: Sequentially covering heat insulation layer 16, flame retardant layer 17, and wear-resistant protective layer 18; S9. Inspection and Warehousing: Finished cables undergo power frequency withstand voltage, shielding attenuation, water immersion insulation, and tensile bending tests before being put into warehousing.

[0024] Example 1: One power conductor core and six control conductor cores are used. The power conductor core has a cross-sectional area of ​​10 mm². 2 The electrical insulation layer 2 has a thickness of 1.7 mm; the control conductor 3 has a cross-sectional area of ​​1.5 mm². 2The arc-shaped insulating strip 11 is 2.5mm thick. The inner shielding layer 9 is wrapped with 0.15mm thick copper strip with an overlap rate of 18%; the outer shielding layer 10 is woven with 0.2mm tinned copper wire with a weaving density of 90%. The inner lining buffer layer 13 is 2.0mm thick with an average micropore diameter of 3µm and a closed-cell rate of 93%. The anti-corrosion coating layer 15 is 0.15mm thick. The armored steel strip is 1.0mm thick with a wrapping angle of 35 degrees. The heat insulation layer 16 is 0.25mm thick, the flame-retardant layer 17 is 1.2mm thick, and the wear-resistant protective layer 18 is 1.5mm thick. Test results: shielding attenuation 48dB, insulation resistance not less than 1000MΩ after immersion in water for 24 hours.

[0025] Example 2: Three power conductor cores and eight control conductor cores are used. The cross-sectional area of ​​power conductor 1 is 16 mm². 2 The cross-sectional area of ​​conductor 3 is 2.0 mm². 2 Arc-shaped insulating barrier strip 11, 3.0mm thick. Inner buffer layer 13, 2.5mm thick. Anti-corrosion coating layer 15, 0.20mm thick. Armored steel strip, 1.2mm thick, wrapping angle 40 degrees. Heat insulation layer 16, 0.30mm thick; flame retardant layer 17, 1.5mm thick; wear-resistant protective layer 18, 1.8mm thick. Test results: shielding attenuation 51dB, mechanical compressive load not less than 8kN.

Claims

1. A combination cable of anti-interference and moisture-proof power cable and control cable, comprising a cable body, characterized in that: The cable body is provided with a core assembly layer, a layered shielding layer and a protective layer from the inside out. The core assembly layer includes a power core group and a control core group. The power core group and the control core group are arranged eccentrically side by side and are separated by an arc-shaped insulating isolation strip (11). The layered shielding layer includes an inner shielding layer (9) covering the outer periphery of the power core group and an outer shielding layer (10) covering the outer periphery of the control core group. The arc-shaped insulating isolation strip (11) separates the inner shielding layer (9) from the outer shielding layer. (10); The power core group is independently cabled before shielding processing, and a power cable filling layer (5) is provided in the cable gap, and the outside is wrapped with power wrapping tape (6) for binding and fixing; The control core group is independently cabled before shielding processing, and a control cable filling layer (7) is provided in the cable gap, and the outside is wrapped with control wrapping tape (8) for binding and fixing; The outer side of the layered shielding layer is wrapped with a combined filling sealing layer (12), and the combined filling sealing layer (12) is filled with a mixture of filling rope and water-blocking sealant, and water-blocking yarn is embedded longitudinally in the gap.

2. The anti-interference and moisture-proof power cable and control cable combination cable according to claim 1, characterized in that: Between the layered shielding layer and the protective layer, there is an inner lining buffer layer (13) and an armor reinforcement layer (14). The inner lining buffer layer (13) is an elastic buffer layer, and the armor reinforcement layer (14) adopts a steel strip spiral wrapping structure. The inner and outer surfaces of the armor reinforcement layer (14) are coated with an anti-corrosion adhesive layer (15).

3. The anti-interference and moisture-proof power cable and control cable combination cable according to claim 1, characterized in that: The protective layer consists of a heat insulation layer (16), a flame retardant layer (17), and a wear-resistant protective layer (18) arranged sequentially from the inside to the outside.

4. The anti-interference and moisture-proof power cable and control cable combination cable according to claim 1, characterized in that: The power conductor core assembly includes one or more power conductors (1) and a power insulation layer (2) extruded on the outside of the power conductors (1). The power conductors (1) are made of multiple strands of oxygen-free copper wires twisted together, and the conductor cross-sectional area is 4 to 25 mm². 2 The electrical insulation layer (2) is made of cross-linked polyethylene insulation material, and the thickness of the electrical insulation layer (2) is 1.2 to 2.0 mm.

5. The anti-interference and moisture-proof power cable and control cable combination cable according to claim 1, characterized in that: The control conductor core group consists of several stranded control conductors (3) and a control insulation layer (4) extruded on the outside of the control conductors (3). The control conductors (3) adopt a tin-plated copper wire stranded structure, and the cross-sectional area of ​​a single control conductor (3) is 0.5 to 2.5 mm². 2 The number of control wire core groups is 4 to 12, and the control insulation layer (4) is made of high-density polyethylene insulation material.

6. The anti-interference and moisture-proof power cable and control cable combination cable according to claim 1, characterized in that: The inner shielding layer (9) is a soft copper strip wrapped shielding layer with a wrapping overlap rate of not less than 15%; the outer shielding layer (10) is a tin-plated copper wire braided shielding layer with a braiding density of not less than 85%; both the inner shielding layer (9) and the outer shielding layer (10) are set with single-end grounding; the arc-shaped insulating isolation strip (11) is made of high-elastic flame-retardant EPDM rubber with a thickness of 2.0 to 3.0 mm.

7. The anti-interference and moisture-proof power cable and control cable combination cable according to claim 1, characterized in that: The water-blocking sealant is composed of the following raw materials in parts by weight: 45-55 parts of polyolefin resin, 15-20 parts of hydrogenated petroleum resin, 10-15 parts of flame retardant filler, 5-8 parts of hydrophobic additive and 2-3 parts of anti-aging additive; the heat insulation layer (16) has a thickness of 0.20-0.35 mm, the flame retardant layer (17) has a thickness of 0.8-1.5 mm, and the wear-resistant protective layer (18) has a thickness of 1.0-2.0 mm.

8. A method for preparing an anti-interference and moisture-proof power cable and control cable combination cable according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Conductor preparation: Oxygen-free copper wire and tin-plated copper wire are stranded in multiple layers and the surface is polished. S2. Insulation extrusion: The insulation material is evenly extruded onto the outside of the conductor using a high-temperature extruder. S3. Independent cabling: The power core and control core are stranded separately into cables, the gaps are filled with flame-retardant filler rope, and the outer side is wrapped and tied with wrapping tape. S4. Core grouping and arrangement: The completed power cable core and control cable core are arranged eccentrically side by side, and the arc-shaped insulation isolation strip (11) is installed in the middle for fixation. S5. Shielding and merging filling: The power cable core and control cable core are respectively shielded and filled. The core is covered with an inner shielding layer (9) and an outer shielding layer (10). The shielding layer has a reserved grounding end. The outer gap of the shielding layer is filled with a mixture of filler rope and water-blocking sealant. Water-blocking yarn is laid longitudinally. S6, Buffer Covering: Extruded elastic buffer rubber layer. S7, Armoring Reinforcement: Coated with anti-corrosion adhesive layer (15), and armored with steel strip spiral wrapping. S8, Outer Sheath Processing: Covered with heat insulation layer (16), flame retardant layer (17) and wear-resistant protective layer (18) in sequence. S9, Inspection and Warehousing: The finished cable is put into warehousing after undergoing power frequency withstand voltage, shielding attenuation and water immersion insulation tests.

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