Tear-resistant and corrosion-resistant rubber flame-retardant power cable

Abstract

A tear-resistant and corrosion-resistant rubber flame-retardant power cable relates to the technical field of power cables and comprises a cable core, three groups of wire cores which are annularly wound and distributed are arranged in the cable core, each wire core is composed of a conductor, a conductor insulating layer and a conductor shielding layer, a tear-resistant layer is arranged outside each wire core, and the tear-resistant layer is arranged outside each conductor insulating layer. The anti-tearing layer is composed of a strengthening layer and a reinforcing layer, the anti-tearing layer is externally provided with the flame-retardant layer, the flame-retardant layer is composed of a heat absorption layer and an expansion layer, the anti-corrosion outer protection layer is externally provided with the anti-corrosion outer protection layer, and the anti-corrosion outer protection layer is composed of a resin coating and a weather-proof layer. According to the scheme, the defects of an existing power cable in the aspects of tear resistance, corrosion resistance and flame retardance are overcome, the reliability of the cable in a complex environment is improved, and the service life of the cable in the complex environment is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to power cable technical field, concretely is a kind of anti-tearing corrosion-resistant rubber flame-retardant power cable. BACKGROUND

[0002] Power cable is a kind of wire system for transmission and distribution of electric energy, usually by conductor (copper or aluminum), insulation layer (such as polyvinyl chloride PVC, cross-linked polyethylene XLPE), shielding layer, filling layer, armored layer and outer sheath and so on composite protective structure is formed, with voltage resistance, anti-electromagnetic interference, corrosion resistance, flame retardant and other characteristics, widely used in underground laying, submarine power transmission, industrial power distribution, building power supply and other fields, can realize the efficient, safe transmission of electric energy under complex environment (such as high temperature, humidity, mechanical stress).

[0003] For example, the Chinese authorized patent "a kind of power cable" with announcement number CN207458664U includes conductor bundle and protective layer, further includes square fixed support, each side of square fixed support is provided with circular-arc fixed slot, and conductor bundle is located in circular-arc fixed slot;Conductor bundle is outwardly sequentially arranged with insulation layer, flame-retardant layer and first steel belt armored layer layer by layer;The protective layer is outwardly sequentially arranged with warning layer and warning layer protective sleeve layer by layer, and the protective layer is inwardly sequentially arranged with second steel belt armored layer and shielding layer layer by layer;Conductor bundle and square fixed support are located in shielding layer, and the cavity formed between conductor bundle and square fixed support and shielding layer is filled with insulating filler.

[0004] But traditional power cable when facing complex use environment, expose many problems.For example, in some construction environment complex, frequent external force place, cable is easily affected by pulling, friction and other external force, lead to cable outer skin tear, and then affect the normal operation of cable, even cause safety accident.At the same time, in the environment with corrosive medium, such as chemical enterprise, coastal area etc., cable outer sheath and internal structure are easily subjected to chemical corrosion, reduce the service life of cable.In addition, once fire, ordinary cable's flame-retardant performance is insufficient, cannot effectively prevent the spread of flame, can cause greater loss, therefore do not satisfy the existing demand, in view of this, we propose a kind of anti-tearing corrosion-resistant rubber flame-retardant power cable. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of anti-tearing corrosion-resistant rubber flame-retardant power cable to solve the deficiency of the existing power cable in anti-tearing, corrosion resistance and flame retardant performance in the above background art, so as to improve the reliability and service life of cable in complex environment.

[0006] To achieve the above object, the utility model provides the following technical scheme: an anti-tear and corrosion-resistant rubber flame-retardant power cable, which comprises a cable core, three groups of wire cores in annular winding distribution are arranged in the cable core, the wire core is composed of a conductor, a conductor insulation layer and a conductor shielding layer, an anti-tear layer is arranged outside the wire core, the anti-tear layer is composed of a reinforcing layer and a reinforcing layer, a flame-retardant layer is arranged outside the anti-tear layer, the flame-retardant layer is composed of a heat-absorbing layer and an expansion layer, a corrosion-resistant outer protective layer is arranged outside the flame-retardant layer, and the corrosion-resistant outer protective layer is composed of a resin coating and a weather-resistant layer.

[0007] Preferably, the conductor adopts a copper alloy and carbon fiber composite conductor, a transition metal layer is plated on the surface of the conductor through electroless plating technology between the conductor and the conductor insulation layer, and metallurgical bonding is formed through high temperature and high pressure compounding.

[0008] Preferably, an integrated structure is formed between the conductor insulation layer and the conductor shielding layer through electron beam irradiation crosslinking process.

[0009] Preferably, the cable core and the anti-tear layer are fixed by using an adhesive containing a silane coupling agent, and the reinforcing layer is woven and wrapped on the inner side of the reinforcing layer.

[0010] Preferably, the anti-tear layer and the flame-retardant layer are connected through a hot-pressing forming process, and the expansion layer is coated on the outer wall of the heat-absorbing layer.

[0011] Preferably, the resin coating is covered on the outside of the flame-retardant layer through a spraying process, and the weather-resistant layer is covered on the outside of the resin coating through a spraying process.

[0012] Preferably, a self-repairing filling material is arranged at the gap between the cable core and the wire core.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1. The utility model discloses a high-strength aramid fiber woven layer and a thermoplastic polyurethane and nanoclay composite rubber reinforcing layer, and the chemical bond connection between the cable core and the anti-tear layer greatly improves the anti-tear performance of the cable, effectively deals with the external force damage such as pulling and friction in the construction process, reduces the cable failure probability, and prolongs the service life of the cable.

[0015] 2. The utility model discloses an anti-corrosion outer sheath with an inner layer epoxy resin coating doped with zinc powder and an outer layer polytetrafluoroethylene and nanosilver composite coating, and the corrosion-resistant properties of each layer of material, so that the cable can operate stably in strong acid, alkali and salt mist environment for a long time, reduce the maintenance cost, and ensure the continuity of power transmission.

[0016] 3, the utility model discloses a synergistic effect of the ethylene-vinyl acetate copolymer rubber heat absorption layer filled with magnesium hydroxide and the intumescent fireproof coating expansion layer, the fire -retardant effect of cable is improved obviously, can effectively prevent the flame spread when the fire occurs, protects the key equipment of power system, reduces the fire loss. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the perspective view of the utility model;

[0018] Figure 2 It is the internal structure section view of the utility model;

[0019] Figure 3 It is the tear -resistant layer structure schematic view of the utility model;

[0020] Figure 4 It is the flame -retardant layer structure schematic view of the utility model;

[0021] Figure 5 It is the anticorrosion outer sheath layer structure schematic view of the utility model.

[0022] In the drawing: 1, core; 11, conductor; 12, conductor insulation layer; 13, conductor shielding layer; 2, tear -resistant layer; 21, reinforcing layer; 22, reinforcing layer; 3, flame -retardant layer; 31, heat absorption layer; 32, expansion layer; 4, anticorrosion outer sheath layer; 41, resin coating; 42, weather layer; 5, self -repairing filling material. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely below with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0024] Please refer to Figures 1-4 The utility model provides an embodiment: a tear -resistant and corrosion -resistant rubber flame -retardant power cable, including cable core, the inside of cable core is equipped with three groups of annular winding distribution core 1, and the core 1 is composed of conductor 11, conductor insulation layer 12 and conductor shielding layer 13, and the outside of core 1 is provided with tear -resistant layer 2, and tear -resistant layer 2 is composed of reinforcing layer 21 and reinforcing layer 22, and the outside of tear -resistant layer 2 is provided with flame -retardant layer 3, and flame -retardant layer 3 is composed of heat absorption layer 31 and expansion layer 32, and the outside of flame -retardant layer 3 is provided with anticorrosion outer sheath layer 4, and anticorrosion outer sheath layer 4 is composed of resin coating 41 and weather layer 42.

[0025] Please refer to Figure 2, the conductor 11 adopts a copper alloy and carbon fiber composite conductor, the conductor 11 and the conductor insulation layer 12 are combined through chemical plating technology, a transition metal layer is plated on the surface of the conductor 11, and then high temperature and high pressure are combined to form metallurgical bonding, the conductor insulation layer 12 and the conductor shielding layer 13 are integrated through electron beam irradiation crosslinking process, and the gap between the cable core and the wire core 1 is provided with a self-repairing filling material 5, which can release a repairing agent from the internal microcapsule to quickly fill the crack and maintain the integrity of the cable core when slightly damaged, thereby improving the reliability of the cable;

[0026] The conductor 11 adopts a high-strength copper alloy and carbon fiber composite conductor, the copper alloy ensures good electrical conductivity, and the carbon fiber greatly improves the tensile strength of the conductor, so that the conductor is not easy to break when bearing a larger tension, and can better adapt to the pulling in complex construction environment than the traditional copper conductor, thereby effectively reducing the risk of open circuit caused by external force; the conductor insulation layer 12 is based on polyvinylidene fluoride, filled with nano titanium dioxide and nano boron nitride, polyvinylidene fluoride has excellent chemical corrosion resistance and electrical insulation performance, nano titanium dioxide enhances the anti-ultraviolet aging ability of the insulation layer, and nano boron nitride improves the thermal conductivity to help the conductor dissipate heat, and the three work together to enable the insulation layer to maintain stable insulation performance in harsh environments; a transition metal layer with good affinity with the insulation layer material is plated on the surface of the conductor through chemical plating technology, and then the insulation layer material is combined with the conductor under high temperature and high pressure to form firm metallurgical bonding, thereby enhancing the interfacial adhesion and preventing the insulation layer from peeling off; the conductor shielding layer 13 adopts a graphene and nitrile rubber composite material, the high electrical conductivity and large specific surface area of graphene are combined with the good flexibility of nitrile rubber to uniformly distribute the electric field and effectively suppress the partial discharge phenomenon, thereby ensuring the safe operation of the cable.

[0027] Please refer to Figure 2 and Figure 3 , the cable core and the tear-resistant layer 2 are fixed by using an adhesive containing a silane coupling agent, the reinforcing layer 21 is knitted and wrapped on the inner side of the reinforcing layer 22, the reinforcing layer 21 is a high-strength aramid fiber knitted layer, and the aramid fiber has extremely high strength and modulus and can effectively resist tearing force; the reinforcing layer 22 is a thermoplastic polyurethane and nano clay composite rubber, the nano clay is uniformly dispersed in the TPU rubber to enhance the mechanical properties of the reinforcing material, and the TPU gives the material good flexibility and wear resistance, and the two layers are combined to greatly improve the tear resistance of the cable.

[0028] Please refer to Figure 2 and Figure 4, the anti-tearing layer 2 and the flame-retardant layer 3 are connected by a hot-pressing process, the expansion layer 32 is coated on the outer wall of the heat-absorbing layer 31, the heat-absorbing layer 31 is magnesium hydroxide filled ethylene-vinyl acetate copolymer rubber, magnesium hydroxide decomposes and absorbs heat and releases water vapor when heated, and plays a flame-retardant role; the expansion layer 32 is an intumescent fireproof coating, which expands to form a heat-insulating carbon foam layer when on fire, and the inner and outer layers cooperate to significantly improve the flame-retardant effect of the cable.

[0029] Please refer to Figure 2 and Figure 5 , the resin coating 41 is coated on the outside of the flame-retardant layer 3 by a spraying process, and the weather-resistant layer 42 is coated on the outside of the resin coating 41 by a spraying process, the resin coating 41 is a zinc powder doped epoxy resin coating, the zinc powder has a sacrificial anode protection effect and can prevent metal corrosion; the weather-resistant layer 42 is a polytetrafluoroethylene and nano-silver composite coating, polytetrafluoroethylene has excellent chemical stability, and nano-silver has antibacterial and corrosion-resistant properties. This composite structure effectively resists the erosion of various chemicals.

[0030] Working principle: when in use, high-strength copper alloy and carbon fiber are mixed in a certain proportion, and a composite conductor is made by drawing and twisting; polyvinylidene fluoride, nano-titanium dioxide and nano-boron nitride are mixed in a proper proportion, and an extrusion molding process is adopted to form a conductor insulation layer 12 on the surface of the conductor 11. Before forming the insulation layer, a transition metal layer is first plated on the surface of the conductor by chemical plating technology, and then the insulation layer material is combined with the conductor under high temperature and high pressure environment; graphene and nitrile rubber are mixed uniformly to form a composite material, which is coated on the surface of the conductor insulation layer 12 by coating process, and then the two are integrated by electron beam irradiation cross-linking process; a plurality of prepared wire cores 1 are twisted to form a cable core, and a self-repairing rubber material is filled in the cable core; high-strength aramid fiber is braided to form an inner layer, and then thermoplastic polyurethane and nano-clay are mixed to form a composite material, which is formed into an outer layer by extrusion or coating process, and the two layers are combined to form an anti-tearing layer 2. The anti-tearing layer 2 is bonded with the cable core by using an adhesive containing silane coupling agent; magnesium hydroxide is filled into ethylene-vinyl acetate copolymer rubber to form an inner heat-absorbing layer 31, which is attached to the outer layer of the anti-tearing layer 2 by extrusion molding process. Then an intumescent fireproof coating is coated on the outer layer to form an expansion layer 32, and the anti-tearing layer 2 and the flame-retardant layer 3 are tightly connected by a hot-pressing process; first, a zinc powder doped epoxy resin coating 31 is sprayed on the inner layer, and then a polytetrafluoroethylene and nano-silver composite coating is sprayed on the outer layer by plasma spraying process, so that it is firmly connected with the flame-retardant layer.

[0031] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A tear and corrosion resistant, rubber flame retardant power cable comprising a core, characterized in that: The inside of the cable core is provided with three groups of annularly wound wire cores (1), which are composed of a conductor (11), a conductor insulation layer (12) and a conductor shielding layer (13), the outside of the wire core (1) is provided with a tear-resistant layer (2), which is composed of a reinforcing layer (21) and a reinforcing layer (22), the outside of the tear-resistant layer (2) is provided with a flame-retardant layer (3), which is composed of a heat-absorbing layer (31) and an expansion layer (32), the outside of the flame-retardant layer (3) is provided with a corrosion-resistant outer protective layer (4), which is composed of a resin coating layer (41) and a weather-resistant layer (42).

2. A tear and corrosion resistant, rubber flame retardant power cable according to claim 1, characterized in that: The conductor (11) adopts a copper alloy and carbon fiber composite conductor, and a transition metal layer is plated on the surface of the conductor (11) through chemical plating technology between the conductor (11) and the conductor insulation layer (12), and then a metallurgical bond is formed through high temperature and high pressure compounding.

3. A tear and corrosion resistant, rubber flame retardant power cable according to claim 2, characterized in that: The conductor insulation layer (12) and the conductor shielding layer (13) are integrated by electron beam irradiation crosslinking process.

4. A tear and corrosion resistant, rubber flame retardant power cable according to claim 1, characterized in that: The cable core and the tear-resistant layer (2) are fixed by using an adhesive containing a silane coupling agent, and the reinforcing layer (21) is woven and wrapped on the inside of the reinforcing layer (22).

5. A tear and corrosion resistant, rubber flame-retardant power cable according to claim 1, characterized in that: The tear-resistant layer (2) and the flame-retardant layer (3) are formed by hot pressing process, and the expansion layer (32) is coated on the outer wall of the heat-absorbing layer (31).

6. A tear and corrosion resistant, rubber flame retardant power cable according to claim 1, characterized in that: The resin coating layer (41) is covered on the outside of the flame-retardant layer (3) by spraying process, and the weather-resistant layer (42) is covered on the outside of the resin coating layer (41) by spraying process.

7. A tear and corrosion resistant, rubber flame resistant power cable according to claim 1, characterized in that: The gap between the cable core and the wire core (1) is provided with a self-repairing filling material (5).

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