Anti-aging anti-cracking radial water-blocking medium-voltage power cable

Abstract

The utility model relates to the technical field of power cables, in particular to an anti-aging anti-cracking radial water-blocking medium-voltage power cable, which comprises a plurality of wire cores which are tangent in pairs and are mutually twisted. The plurality of filling ropes are filled among the wire cores; the wrapping layer is wrapped outside the wire cores and the filling ropes and fixes the wire cores and the filling ropes together to form a cable core with a circular cross section; the oxygen barrier layer is extruded on the outer wall of the cable core; the elastic buffer layer is coated on the outer wall of the oxygen barrier layer; and the outer wall of the elastic buffer layer is coated with the metal belt water-blocking layer. According to the utility model, the elastic buffer layer formed by the plurality of elastic strips is arranged between the metal tape water-blocking layer and the oxygen barrier layer, so that when the cable is bent or collapsed, the stress of the surrounding structure on the metal tape water-blocking layer is reduced through the deformation of the elastic strips, and the structural integrity of the metal tape water-blocking layer is maintained; therefore, the cable still has good radial water-blocking performance in a long period, and the water-blocking requirement in a complex environment is met.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, and more specifically to an anti-aging and anti-cracking radially blocking medium-voltage power cable. Background Technology

[0002] In humid environments, such as underground cable shafts or underground substations, cables are frequently exposed to moisture. If the radial water-blocking capacity of the cable is insufficient, moisture can penetrate into the cable's interior, damaging its insulation performance, causing short circuits, and affecting the stability and safety of power transmission. Especially in areas with heavy rainfall, prolonged rain can cause water to accumulate in cable shafts, immersing the cables and placing even higher demands on their radial water-blocking capacity.

[0003] Currently, medium-voltage cables typically use water-blocking tape and aluminum-plastic composite tape to form a waterproof structure. The aluminum-plastic composite tape mainly plays a radial water-blocking role. However, the aluminum-plastic composite tape has a certain rigidity, which limits the flexibility of the cable. It is also prone to creases due to bending and twisting during cable laying, which can damage or destroy the waterproof performance of the cable. Summary of the Invention

[0004] To address the technical problems existing in water-blocking cables in the prior art, this utility model proposes an anti-aging and crack-resistant radial water-blocking high-voltage power cable, comprising:

[0005] Multiple wire cores that are tangent to each other and twisted together;

[0006] Multiple filler cords are used to fill the spaces between the wire cores;

[0007] The sheathing layer wraps around the outside of the conductor and filler rope, and fixes the conductor and filler rope together into a cable core with a circular cross-section;

[0008] An oxygen barrier layer is extruded onto the outer wall of the cable core;

[0009] An elastic buffer layer is wrapped around the outer wall of the oxygen barrier layer;

[0010] A metal strip water-blocking layer is wrapped around the outer wall of the elastic buffer layer;

[0011] Flame-retardant wrapping tape is wrapped around the outer wall of the water-blocking layer of the metal strip.

[0012] The outer sheath is extruded onto the outer wall of the flame-retardant wrapping tape;

[0013] The elastic buffer layer includes multiple loosely wound elastic strips and a water-blocking rope filled between the oxygen barrier layer and the metal strip water-blocking layer.

[0014] Preferably, the elastic strip includes a hollow elastic strip, and the water-blocking rope is disposed on the outside of the hollow elastic strip. The hollow elastic strip is configured as a hollow tubular structure, the tube wall of the hollow elastic strip has multiple micropores, and the water-blocking rope is disposed inside the cavity of the hollow elastic strip.

[0015] Preferably, the elastic strip further includes a solid elastic strip, which is arranged at intervals from the hollow elastic strip. Particularly preferably, the hollow elastic strip has multiple micropores in its tube wall. The water-blocking rope is disposed inside and / or outside the hollow elastic strip.

[0016] Preferably, the adjacent solid elastic strips and hollow elastic strips are tightly fitted together.

[0017] Preferably, the water-blocking rope comprises highly absorbent resin fibers.

[0018] Preferably, the metal strip water-blocking layer includes an aluminum-plastic composite strip or a copper-plastic composite strip.

[0019] Preferably, the flame-retardant wrapping tape comprises double-layer glass fiber wrapping tape with a wrapping overlap rate greater than 30%.

[0020] Preferably, the oxygen barrier layer comprises a ceramicized silicone rubber oxygen barrier layer.

[0021] Preferably, the core comprises a tin-plated copper wire stranded conductor, a water-blocking wrapping layer, a conductor shielding layer, an insulation layer, an insulation shielding layer, and a copper foil shielding layer distributed from the inside out.

[0022] Based on the above technical solutions, the significant advantages of this utility model's anti-aging and crack-resistant radial water-resistant medium-voltage power cable are as follows:

[0023] This utility model of an anti-aging and anti-cracking radial water-blocking low-voltage power cable has an elastic buffer layer composed of multiple elastic strips between the metal strip water-blocking layer and the oxygen barrier layer. When the cable is bent or expands and contracts, the deformation of the elastic strips reduces the stress of the surrounding structure on the metal strip water-blocking layer, maintains the structural integrity of the metal strip water-blocking layer, and ensures that the cable still has good radial water-blocking performance over a long period of time, meeting the water-blocking requirements in complex environments. Attached Figure Description

[0024] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structure of the anti-aging and anti-cracking radially blocking medium-voltage power cable shown in this utility model.

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the anti-aging and anti-cracking radially blocking medium-voltage power cable shown in this utility model.

[0027] Figure 3 This is a schematic diagram of the structure of the elastic buffer layer shown in this utility model. Detailed Implementation

[0028] Combination Figure 1 and Figure 2 As shown, the anti-aging and anti-cracking radial water-blocking medium-voltage power cable according to an embodiment of the present invention includes a cable core, an oxygen barrier layer 4, an elastic buffer layer 5, a metal strip water-blocking layer 6, a flame-retardant wrapping tape 7, and an outer sheath 8.

[0029] The cable core includes multiple tangentially twisted cores 1, and multiple filler ropes 2 fill between the cores 1. The filler ropes 2 are water-blocking ropes. By filling between the cores 1, the cable core structure is made dense, and it also plays a waterproof role, preventing water vapor from entering the cable and being transmitted along the cable axis.

[0030] In an optional embodiment, the wire core 1 includes a tinned copper wire stranded conductor 11, a water-blocking wrapping layer 12, a conductor shielding layer 13, an insulating layer 14, an insulating shielding layer 15, and a copper foil shielding layer 16 distributed from the inside out.

[0031] A water-blocking wrapping layer 12 is provided on the outer layer of the tin-plated copper wire stranded conductor 11, which can form axial water blockage in the conductor and prevent water vapor from being transmitted axially in the conductor. The conductor shielding layer 13, the insulation layer 14, and the insulation shielding layer 15 are formed by three-layer co-extrusion. Further, a copper foil shielding layer 16 is provided outside the insulation shielding layer 15 to form a better radial water blockage and shielding effect.

[0032] Furthermore, the wrapping layer 3 wraps around the outside of the core 1 and the filler rope 2, and fixes the core 1 and the filler rope 2 together into a cable core with a circular cross-section.

[0033] The wrapping layer 3 can be a double-layer polyester tape wrapping layer, with the wrapping overlap rate controlled at 45~55%, so that the cable core formed by the wrapping is compact and has tensile strength.

[0034] Furthermore, the oxygen barrier layer 4 is extruded onto the outer wall of the cable core. Optionally, the oxygen barrier layer 4 is a ceramicized silicone rubber oxygen barrier layer.

[0035] The ceramicized silicone rubber oxygen barrier layer undergoes a rapid ceramicization reaction at high temperatures, forming a hard and dense ceramic protective layer that effectively prevents oxygen from entering the cable, thereby inhibiting the combustion of combustible materials in the cable and cutting off the oxygen supply required for combustion. At the same time, it does not produce toxic fumes or corrosive gases and has the characteristics of low smoke and halogen-free.

[0036] Meanwhile, the ceramicized silicone rubber oxygen barrier layer also has good flexibility and aging resistance, which does not affect the bending and installation of the cable and ensures long-term stability.

[0037] Furthermore, the elastic buffer layer 5 covers the outer wall of the oxygen barrier layer 4, and the metal strip water-blocking layer 6 covers the outer wall of the elastic buffer layer 5. The metal strip water-blocking layer 6 is made of aluminum-plastic composite or copper-plastic composite.

[0038] Specifically, when aluminum-plastic composite tape or copper-plastic composite tape is wrapped longitudinally, the gaps can be completely sealed by polyethylene, so that the metal tape water-blocking layer 6 has good radial water-blocking ability.

[0039] Thus, by placing the elastic buffer layer 5 between the oxygen barrier layer 4 and the metal strip water-blocking layer 6, the stress on the metal strip water-blocking layer 6 can be reduced by the deformation of the elastic buffer layer 5 when the cable bends or expands and contracts due to temperature changes, thus preventing the metal strip water-blocking layer 6 from developing gaps or cracks in the cable caused by temperature differences or bending stress.

[0040] The elastic buffer layer 5 includes multiple loosely wound elastic strips and a water-blocking rope 53 filled between the oxygen barrier layer 4 and the metal strip water-blocking layer 6.

[0041] Thus, the compression deformation of the elastic strip provides a buffer for the water-blocking layer 6 of the metal strip, reducing the compressive / tensile stress generated during bending and expansion / contraction, while the water-blocking rope 53 plays a water-blocking role within the elastic buffer layer 5.

[0042] In an optional embodiment, the elastic strip includes a hollow elastic strip 52, and the water-blocking rope 53 is disposed on the outside of the hollow elastic strip 52.

[0043] Optionally, the hollow elastic strip 52 can be a ceramicized silicone rubber elastic strip.

[0044] Thus, the hollow elastic strip 52 can provide better elasticity and deformation space to further reduce the stress on the metal strip water-blocking layer 6, while the water-blocking rope 53 set on the outside of the hollow elastic strip 52 can absorb the water vapor in the gap between the metal strip water-blocking layer 6 and the oxygen barrier layer 4.

[0045] Furthermore, the hollow elastic strip 52 is configured as a hollow tubular structure, and the tube wall of the hollow elastic strip 52 is provided with multiple micropores. The water-blocking rope 53 is disposed inside the cavity of the hollow elastic strip 52.

[0046] In this way, the density of the hollow elastic strip 52 can be higher, which can play a better supporting and flame-retardant role. At the same time, the water-blocking rope 53 inside the hollow elastic strip 52 can block water. When a fire occurs, the high-density hollow elastic strip 52 forms a fire barrier to isolate external heat. Meanwhile, the water-blocking rope 53 inside the hollow elastic strip 52 can release water vapor, absorb heat, and reduce the temperature rise rate inside the cable.

[0047] Furthermore, the elastic strip includes a solid elastic strip 51 and a hollow elastic strip 52, arranged at intervals. The hollow elastic strip 52 has multiple micropores in its tube wall, and a water-blocking rope 53 is disposed inside and / or outside the hollow elastic strip 52. Adjacent solid elastic strips 51 and hollow elastic strips 52 are tightly fitted together. The solid elastic strip 51 can be selected as a polypropylene elastic strip or a ceramicized silicone rubber elastic strip.

[0048] Thus, compared to hollow elastic strips 51, the staggered distribution of solid elastic strips 51 and hollow elastic strips 52 can further increase the flame retardancy and heat insulation capabilities of the elastic buffer layer 5.

[0049] In the above embodiments, the water-blocking rope 53 may be selected as a highly absorbent resin fiber, such as polyacrylic acid fiber and polyvinyl alcohol fiber, which are woven and twisted together to form a water-blocking rope 53 of a predetermined diameter.

[0050] Furthermore, the flame-retardant wrapping tape 7 is wrapped around the outer wall of the metal strip water-blocking layer 6. The flame-retardant wrapping tape 7 can be selected as a double-layer glass fiber wrapping tape with a wrapping overlap rate of more than 30%.

[0051] By setting a glass fiber wrapping tape on the outer layer of the metal strip water-blocking layer 6, the non-flammability and heat insulation properties of the glass fiber tape can be used to reduce the rate at which external heat is transferred to the interior.

[0052] Furthermore, the outer sheath 8 is extruded onto the outer wall of the flame-retardant wrapping tape 7. The outer sheath 8 can be a thermoplastic elastic outer sheath, which has strong weather resistance and can maintain stable performance under different climatic conditions, resisting the effects of environmental factors such as ultraviolet rays, high temperature, and low temperature, thus extending the service life of the cable.

[0053] In conjunction with the above embodiments, this utility model provides an elastic buffer layer composed of multiple elastic strips between the metal strip water-blocking layer and the oxygen barrier layer. When the cable is bent or expands and contracts, the deformation of the elastic strips reduces the stress of the surrounding structure on the metal strip water-blocking layer, maintains the structural integrity of the metal strip water-blocking layer, and ensures that the cable still has good radial water-blocking performance under long-term conditions, thus meeting the water-blocking requirements in complex environments.

[0054] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. An anti-aging, anti-cracking, radial water-blocking medium voltage power cable, characterized in that, include: Multiple wire cores that are tangent to each other and twisted together (1); Multiple filler ropes (2) are filled between the wire cores (1); The wrapping layer (3) wraps around the outside of the core (1) and the filler rope (2) and fixes the core (1) and the filler rope (2) together into a cable core with a circular cross section; The oxygen barrier layer (4) is extruded onto the outer wall of the cable core; An elastic buffer layer (5) covers the outer wall of the oxygen barrier layer (4); A metal strip water-blocking layer (6) covers the outer wall of the elastic buffer layer (5); Flame-retardant wrapping tape (7) is wrapped around the outer wall of the water-blocking metal strip layer (6); The outer sheath (8) is extruded onto the outer wall of the flame-retardant wrapping tape (7); The elastic buffer layer (5) includes multiple loosely wound elastic strips and a water-blocking rope (53) filled between the oxygen barrier layer (4) and the metal strip water-blocking layer (6). The elastic strip includes a hollow elastic strip (52), and the water-blocking rope (53) is disposed on the outside of the hollow elastic strip (52); The hollow elastic strip (52) is configured as a hollow tubular structure, and the tube wall of the hollow elastic strip (52) is provided with multiple micropores. The water-blocking rope (53) is disposed inside the tube cavity of the hollow elastic strip (52).

2. The anti-aging, anti-cracking radial water-blocking medium voltage power cable according to claim 1, characterized in that, The elastic strip also includes a solid elastic strip (51), which is arranged at intervals with the hollow elastic strip (52).

3. The anti-aging, anti-cracking radial water-blocking medium voltage power cable according to claim 2, characterized in that, The hollow elastic strip (52) has multiple micropores in its tube wall.

4. The anti-aging, anti-cracking radial water-blocking medium voltage power cable of claim 2, wherein, The water-blocking rope (53) is disposed inside and / or outside the hollow elastic strip (52).

5. The anti-aging, anti-cracking radial water-blocking medium voltage power cable of claim 2, wherein, The adjacent solid elastic strips (51) and hollow elastic strips (52) fit together tightly.

6. Anti-ageing, anti-cracking radial water-blocking medium voltage power cable according to any of claims 1-5, characterized in that, The water-blocking rope (53) comprises highly absorbent resin fibers.

7. The anti-aging, anti-cracking radial water-blocking medium voltage power cable of claim 1, wherein, The metal strip water-blocking layer (6) includes an aluminum-plastic composite strip or a copper-plastic composite strip.

8. The anti-aging, anti-cracking radial water-blocking medium voltage power cable of claim 1, wherein, The flame-retardant wrapping tape (7) includes a double-layer glass fiber wrapping tape with a wrapping overlap rate of more than 30%.

9. The anti-aging and crack-resistant radial water-resistant medium-voltage power cable according to claim 1, characterized in that, The oxygen barrier layer (4) includes a ceramicized silicone rubber oxygen barrier layer.

10. The anti-aging, anti-cracking radial water-blocking medium voltage power cable of claim 1, wherein, The core (1) includes a tinned copper wire stranded conductor (11), a water-blocking wrapping layer (12), a conductor shielding layer (13), an insulation layer (14), an insulation shielding layer (15), and a copper foil shielding layer (16) distributed from the inside out.

Images