Irradiation crosslinking polyolefin low-voltage cable

Abstract

The utility model discloses an irradiation crosslinking polyolefin low voltage cable relates to low voltage cable technical field, from inside to outside, including cable core, flame retardant layer, compressive layer, anticorrosive layer and oversheath in proper order, the cable core includes wire core and filling resin around the wire core, the wire core includes conductor and coating outside the inner insulating layer of conductor, the inner insulating layer is coated outside the conductor, the outer insulating layer is coated outside the outer insulating layer, the outer insulating layer is coated outside the outer insulating layer, and the outer insulating layer is coated outside the outer insulating layer. The inner insulating layer is made of an irradiation cross-linked polyolefin material; the flame-retardant layer comprises a flame-retardant base layer and a flame-retardant reinforced layer on the outer side of the flame-retardant base layer; the compression-resistant layer comprises an absorption layer and a deformation-resistant layer; the anti-corrosion layer comprises a breathable film and a weather-proof layer; according to the scheme, the flame-retardant performance, the anti-pressure capability, the moisture-proof and anti-corrosion performance and the signal transmission stability of the cable are improved, so that the cable can adapt to various complex use environments.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage cable technology, specifically to an irradiated cross-linked polyolefin low-voltage cable. Background Technology

[0002] Low-voltage cables are used for transmitting and distributing low-voltage electrical energy. They are typically suitable for power systems with a rated voltage of 1kV and below. They consist of one or more insulated conductors and an outer protective sheath. They feature good insulation performance, low transmission loss, safety and reliability, and convenient installation. They are widely used in urban power grids, internal power supply of industrial enterprises, connection of electrical equipment in buildings, and various places where low-voltage power is required to achieve stable and efficient power transmission.

[0003] For example, the Chinese authorized patent CN219286093U, entitled "An Intelligent Low-Voltage Cable," includes a protective sleeve with a breathable layer on the inner side. Four limiting brackets are fixedly installed on the inner side of the breathable layer. A grounding conductor and a main conductor are installed inside the protective sleeve, with the grounding conductor located at the center of the sleeve. This intelligent low-voltage cable, with its support brackets and limiting brackets, stably confines the grounding conductor and main conductor within the protective sleeve, improving the stability of the internal spatial structure. The protective sleeve, made of ceramicized silicone rubber, the filler containing mineral powder, and two sets of high-temperature resistant mica tapes protect the internal circuitry in case of fire. The filler containing heat-dissipating material absorbs the heat generated during power transmission.

[0004] Existing low-voltage cables often prioritize heat dissipation as a key performance indicator in their structural design. However, in certain specific application scenarios, such as low-temperature environments and short-term low-load operation, heat dissipation is not a critical requirement. Furthermore, these cables still have shortcomings in flame retardancy, pressure resistance, moisture resistance, and corrosion resistance, failing to meet the higher requirements for comprehensive cable performance in complex environments. Therefore, they do not meet current needs. To address this, we propose an irradiated cross-linked polyolefin low-voltage cable. Utility Model Content

[0005] The purpose of this invention is to provide an irradiated cross-linked polyolefin low-voltage cable that improves the cable's flame retardant properties, compressive strength, moisture and corrosion resistance, and signal transmission stability, so as to adapt to a variety of complex operating environments.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an irradiated cross-linked polyolefin low-voltage cable, comprising, from the inside out, a cable core, a flame-retardant layer, a pressure-resistant layer, an anti-corrosion layer, and an outer sheath. The cable core includes a conductor and resin filling around the conductor. The conductor is a tin-plated copper wire, and the inner insulation layer is made of irradiated cross-linked polyolefin material. The flame-retardant layer includes a flame-retardant base layer and a flame-retardant reinforcing layer outside the flame-retardant base layer. The flame-retardant base layer is an aerogel flame-retardant layer, and the flame-retardant reinforcing layer is basalt fiber cloth. The pressure-resistant layer includes an absorption layer and a resistance-modifying layer. The absorption layer is a carbon fiber reinforced plastic layer, and the resistance-modifying layer is stainless steel corrugated tape. The anti-corrosion layer includes a breathable membrane and a weather-resistant layer. The breathable membrane is a nano-silica waterproof and breathable membrane, and the weather-resistant layer is a graphene-modified polyethylene layer. The outer sheath is made of irradiated cross-linked polyolefin material.

[0007] Preferably, the conductor has a multi-strand stranded structure.

[0008] Preferably, the inner insulating layer is formed into a three-dimensional network structure of polyolefin molecules by electron beam irradiation.

[0009] Preferably, the flame-retardant base layer is tightly bonded to the outside of the inner insulation layer by winding, and the flame-retardant reinforcing layer is wrapped around the outside of the flame-retardant base layer by wrapping, and the basalt fiber cloth of the flame-retardant reinforcing layer is impregnated with flame-retardant resin.

[0010] Preferably, the absorbent layer is tightly connected to the flame-retardant layer by a hot-pressing process, and the resistance-modifying layer is wrapped around the outside of the absorbent layer.

[0011] Preferably, the breathable membrane is wrapped around the outside of the pressure-resistant layer by winding, and the weather-resistant layer is tightly wrapped around the outside of the breathable membrane by extrusion.

[0012] Preferably, the outer sheath contains abrasion-resistant agents, UV-resistant agents, and antimicrobial agents.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The cable core of this utility model consists of a conductor and an inner insulation layer. The tin-plated copper wire conductor not only has excellent conductivity, but the tin plating layer on its surface also effectively prevents oxidation, ensuring stable current transmission. The inner insulation layer, made of irradiated cross-linked polyolefin material, has a stable three-dimensional network structure, providing reliable electrical insulation and reducing the risk of leakage. In the flame-retardant layer, the aerogel flame-retardant layer of the flame-retardant base layer, with its extremely low thermal conductivity, can effectively isolate heat transfer and delay the spread of fire. The basalt fiber cloth of the flame-retardant reinforcement layer, after being impregnated with flame-retardant resin, forms a high-strength protective barrier.

[0015] 2. This utility model has strong environmental adaptability. The pressure-resistant layer uses a carbon fiber reinforced plastic layer, which has high strength and low density characteristics, and can effectively absorb external pressure. The stainless steel corrugated strip of the resistance layer provides rigid support. The combination of the two allows the cable to maintain a stable internal structure when subjected to high-pressure environments such as deep burial and underground pipeline laying. The breathable membrane of the anti-corrosion layer is a nano-silica waterproof and breathable membrane, which can prevent the intrusion of external moisture while allowing internal moisture to escape, keeping the interior dry. The graphene-modified polyethylene layer of the weather-resistant layer has excellent anti-corrosion performance and can resist the erosion of chemicals such as acids and alkalis, enabling the cable to operate stably in harsh environments such as humidity and chemical pollution, greatly expanding the application scenarios of the cable.

[0016] 3. The inner insulation layer, flame-retardant layer, pressure-resistant layer, and anti-corrosion layer of this utility model form a protective layer, which respectively play a role in electrical insulation, flame retardancy, pressure resistance, deformation resistance, moisture resistance, and corrosion resistance, providing comprehensive protection for the internal structure of the cable from damage by external factors. The outer sheath is made of irradiated cross-linked polyolefin material with added abrasion-resistant agents, UV stabilizers, and antimicrobial agents, further enhancing its abrasion resistance, aging resistance, and resistance to microbial erosion. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present utility model;

[0018] Figure 2 This is a cross-sectional view of the internal structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the flame-retardant layer structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the compressive layer structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the anti-corrosion layer structure of this utility model.

[0022] In the diagram: 1. Cable core; 2. Wire core; 21. Conductor; 22. Inner insulation layer; 3. Flame retardant layer; 31. Flame retardant base layer; 32. Flame retardant reinforcing layer; 4. Compression-resistant layer; 41. Absorbent layer; 42. Resistance-resistant layer; 5. Corrosion-resistant layer; 51. Breathable membrane; 52. Weather-resistant layer; 6. Outer sheath; 7. Resin filler. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Please see Figure 1-5The present invention provides an embodiment of an irradiated cross-linked polyolefin low-voltage cable, comprising, from the inside out, a cable core 1, a flame-retardant layer 3, a pressure-resistant layer 4, an anti-corrosion layer 5, and an outer sheath 6. The cable core 1 includes a wire core 2 and a resin filler 7 filling the area around the wire core 2. The wire core 2 includes a conductor 21 and an inner insulation layer 22 covering the outside of the conductor 21. The conductor 21 is a tin-plated copper wire, and the inner insulation layer 22 is made of irradiated cross-linked polyolefin material. The conductor 21 has a multi-strand stranded structure, and the inner insulation layer 22 is formed into a three-dimensional network structure by electron beam irradiation of the polyolefin molecules.

[0025] Tinned copper wire serves as conductor 21. The tin layer on its surface effectively prevents copper wire oxidation, ensuring long-term stable conductivity and reducing resistance increase and power loss caused by oxidation. The multi-strand stranded structure gives the cable good flexibility, facilitating laying and installation in confined spaces and complex routes. The inner insulation layer 22 uses irradiated cross-linked polyolefin material and forms a three-dimensional network structure through electron beam irradiation, significantly improving insulation performance. It can withstand higher voltages without breakdown and also enhances mechanical strength, allowing the cable to maintain good insulation even under high-temperature environments or when subjected to external pulling or squeezing, reducing the risk of leakage and ensuring electrical safety. The resin filler 7 acts as a buffer for the conductor core 2, filling the gaps between the conductor cores 2, making the cable structure more compact and enhancing overall stability.

[0026] Please see Figure 3 The flame retardant layer 3 includes a flame retardant base layer 31 and a flame retardant reinforcing layer 32 on the outside of the flame retardant base layer 31. The flame retardant base layer 31 is an aerogel flame retardant layer, and the flame retardant reinforcing layer 32 is basalt fiber cloth. The flame retardant base layer 31 is tightly attached to the outside of the inner insulation layer 22 by winding, and the flame retardant reinforcing layer 32 is wrapped around the outside of the flame retardant base layer 31 by wrapping. The basalt fiber cloth of the flame retardant reinforcing layer 32 is impregnated with flame retardant resin.

[0027] Aerogel flame-retardant layers have extremely low thermal conductivity, effectively slowing the spread of fire in the event of a fire. Simultaneously, the lightweight nature of aerogel does not excessively increase the weight of the cable. Basalt fiber cloth impregnated with flame-retardant resin forms a high-strength flame-retardant protective layer that maintains structural stability at high temperatures, preventing flame penetration and creating a double flame-retardant barrier together with the aerogel layer.

[0028] Please see Figure 4 The compression-resistant layer 4 includes an absorbent layer 41 and a resistance-modified layer 42. The absorbent layer 41 is a carbon fiber reinforced plastic layer, and the resistance-modified layer 42 is a stainless steel corrugated strip. The absorbent layer 41 is tightly connected to the flame-retardant layer 3 through a hot-pressing process, and the resistance-modified layer 42 is wrapped around the outside of the absorbent layer 41 by wrapping.

[0029] The carbon fiber reinforced plastic layer possesses high strength and low density, effectively absorbing and dispersing external pressure to prevent damage to the cable's internal structure due to excessive local pressure. It is tightly bonded to the flame-retardant layer 3 via a hot-pressing process, ensuring the overall structural stability and synergy. The stainless steel corrugated tape, with its inherent rigidity and unique corrugated structure, provides the cable with strong resistance to deformation, effectively limiting the degree of cable deformation under significant pressure.

[0030] Please see Figure 5 The anti-corrosion layer 5 includes a breathable membrane 51 and a weather-resistant layer 52. The breathable membrane 51 is a nano-silica waterproof and breathable membrane, and the weather-resistant layer 52 is a graphene-modified polyethylene layer. The breathable membrane 51 is wrapped around the outside of the pressure-resistant layer 4 by winding, and the weather-resistant layer 52 is tightly wrapped around the outside of the breathable membrane 51 by extrusion process.

[0031] The nano-silica waterproof and breathable membrane 51 prevents external moisture from penetrating the cable, thus preventing insulation degradation and conductor corrosion caused by humidity. Simultaneously, it allows moisture generated inside the cable to escape, maintaining a dry internal environment. Its unique breathable structure does not affect the cable's breathing function during normal operation, avoiding safety hazards caused by internal moisture accumulation. The graphene-modified polyethylene layer has excellent corrosion resistance, resisting the erosion of acids, alkalis, salt spray, and other chemicals.

[0032] Furthermore, the outer sheath 6 is made of irradiated cross-linked polyolefin material, and contains abrasion-resistant agents, UV stabilizers, and antimicrobial agents. The irradiated cross-linked polyolefin material, as the base material of the outer sheath 6, possesses excellent mechanical properties and chemical resistance, providing basic protection for the cable. The added abrasion-resistant agents enhance the surface hardness and abrasion resistance of the outer sheath 6, effectively reducing wear and tear during cable laying due to friction with the ground or pipes, or during use when subjected to external scraping, thus protecting the internal structure. The UV stabilizers absorb and reflect ultraviolet rays, reducing the damaging effects of ultraviolet radiation on the outer sheath 6 material and preventing aging and cracking due to long-term UV exposure. The antimicrobial agents inhibit the growth and erosion of microorganisms, preventing damage to the cable caused by microorganisms.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A low-voltage cable for irradiated cross-linked polyolefin, characterized in that: From the inside out, the cable consists of a cable core (1), a flame-retardant layer (3), a pressure-resistant layer (4), an anti-corrosion layer (5), and an outer sheath (6). The cable core (1) includes a wire core (2) and resin filler (7) surrounding the wire core (2). The wire core (2) includes a conductor (21) and an inner insulation layer (22) covering the outside of the conductor (21). The conductor (21) is tin-plated copper wire, and the inner insulation layer (22) is made of irradiated cross-linked polyolefin material. The flame-retardant layer (3) includes a flame-retardant base layer (31) and a flame-retardant layer on the outside of the flame-retardant base layer (31). The flame-retardant base layer (31) is an aerogel flame-retardant layer, and the flame-retardant reinforcing layer (32) is basalt fiber cloth; the pressure-resistant layer (4) includes an absorption layer (41) and a resistance-modifying layer (42), the absorption layer (41) is a carbon fiber reinforced plastic layer, and the resistance-modifying layer (42) is a stainless steel corrugated strip; the anti-corrosion layer (5) includes a breathable membrane (51) and a weather-resistant layer (52), the breathable membrane (51) is a nano-silica waterproof and breathable membrane, and the weather-resistant layer (52) is a graphene-modified polyethylene layer; the outer sheath (6) is made of irradiated cross-linked polyolefin material.

2. The irradiated cross-linked polyolefin low-voltage cable according to claim 1, characterized in that: The conductor (21) has a multi-strand strand structure.

3. The irradiated cross-linked polyolefin low-voltage cable according to claim 1, characterized in that: The inner insulating layer (22) forms a three-dimensional network structure of polyolefin molecules through electron beam irradiation.

4. The irradiated cross-linked polyolefin low-voltage cable according to claim 1, characterized in that: The flame-retardant base layer (31) is tightly attached to the outside of the inner insulation layer (22) by winding, and the flame-retardant reinforcing layer (32) is wrapped around the outside of the flame-retardant base layer (31) by wrapping, and the basalt fiber cloth of the flame-retardant reinforcing layer (32) is impregnated with flame-retardant resin.

5. The irradiated cross-linked polyolefin low-voltage cable according to claim 1, characterized in that: The absorbent layer (41) is tightly connected to the flame retardant layer (3) by hot pressing, and the resistant variable layer (42) is wrapped around the outside of the absorbent layer (41).

6. The irradiated cross-linked polyolefin low-voltage cable according to claim 1, characterized in that: The breathable membrane (51) is wrapped around the outside of the pressure-resistant layer (4) by winding, and the weather-resistant layer (52) is tightly wrapped around the outside of the breathable membrane (51) by extrusion process.

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