Anti-biting armored fireproof and moistureproof power cable

Abstract

The utility model relates to the technical field of special cables, in particular to an anti-biting armored fireproof and moistureproof power cable, which comprises a cable core with a circular cross section formed by wrapping a flame-retardant filling structure filled among wire cores and a plurality of mutually twisted wire cores by a mica tape, the outer wall of the cable core is coated with the flame-retardant layer; the inner sheath layer is extruded on the outer wall of the flame-retardant layer; and the outer wall of the inner sheath layer is coated with the armor layer. According to the utility model, the molded wire tightly-pressed conductor is adopted as the conductor, the moisture-proof effect of the conductor is good, the cable core structure is compact, water vapor is not easy to remain, and the flame-retardant glass wool cloth flame-retardant structure is arranged on the outer layer of the cable core wrapping tape, so that when the cable is heated and is on fire, a hardened shell can be formed in time, and the formed hardened shell is not easy to be damaged by water vapor in the cable core so as to maintain the flame-retardant effect; according to the application, the longitudinally-wrapped copper-plastic composite belt and the glass fiber wrapping layer are arranged between the inner sheath and the outer sheath, so that a radial water-blocking effect is realized, and meanwhile, the cable can be effectively prevented from being bitten by rats and ants.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to an anti-bite armored fireproof and moisture-proof power cable. Background Art

[0002] Transportation hubs such as airports and railway stations are crucial for power supply and safety and stability. Therefore, cables need to have high fire resistance, heat resistance, moisture resistance and damage resistance. Due to the humid environment in which cables are laid, such as airport runways, subway tunnels, culverts, etc., high protection requirements are placed on the cables. These areas are not within municipal maintenance areas and are subject to periodic inspection and cleaning (cleaning cycle can be up to several months), or are laid on ships, light-proof warehouses and other areas, where rats and ants often gather or forage, and the cables are also threatened by being bitten and damaged.

[0003] The water-blocking property of a cable is usually achieved by utilizing the water-absorbing property of a water-absorbing material. For example, radial water-blocking is achieved by utilizing the water-absorbing capacity of the water-absorbing resin added to the water-blocking yarn and water-blocking rope. The water-blocking layer is generally provided between the flame-retardant layer and the armor layer. When the cable sheath is cracked or damaged due to gnawing, water vapor will be absorbed into the water-blocking layer. Once the cable is short-circuited and heated, the water vapor rapidly decomposed by the water-absorbing resin after being heated is likely to destroy the flame-retardant layer in a softened or charred state, making it impossible for the cable to maintain its flame-retardant properties continuously. Utility Model Content

[0004] In view of the defects and shortcomings of the existing technology, the first aspect of the present invention provides an anti-bite armored fireproof and moisture-proof power cable, comprising:

[0005] The flame retardant filling structure filled between the wire cores and multiple twisted wire cores are wrapped with mica tape to form a cable core with a circular cross-section;

[0006] a flame retardant layer, covering the outer wall of the cable core;

[0007] An inner sheath layer, extruded onto the outer wall of the flame retardant layer;

[0008] An armor layer covering the outer wall of the inner sheath layer;

[0009] A glass fiber tape wrapping layer wrapped around the outer wall of the armor layer;

[0010] An outer sheath layer, extruded onto the outer wall of the glass fiber tape;

[0011] Wherein, the armor layer includes a longitudinally wrapped copper-plastic composite tape, and the conductor core of the wire core includes a profiled wire compressed conductor.

[0012] Preferably, the inner sheath layer comprises a low-smoke, halogen-free, flame-retardant polyolefin insulation layer, the outer sheath layer comprises a nylon sheath, and the thickness ratio of the outer sheath layer to the inner sheath layer is greater than 3:1.

[0013] Preferably, the thickness of the outer sheath layer is 3-5 mm.

[0014] Preferably, the wire core includes a conductor core and an insulation layer, the conductor core includes a three-layer wire compression structure, the first layer is a circular cross-section aluminum alloy conductor, the second layer and the third layer are trapezoidal cross-section aluminum alloy conductors, and the insulation layer includes an inner semi-conductive layer, a polyethylene insulation layer and an outer semi-conductive layer formed by three co-extruded layers.

[0015] Preferably, the flame retardant filling structure includes a foamed polyurethane filling strip, which fills the space between the mica tape and the cable core to make the cable core compact.

[0016] Preferably, the foamed polyurethane filling strip is constructed with a special-shaped cross-section, including two concave arc surfaces that fit with the wire core and a convex arc surface that fits with the mica tape.

[0017] Preferably, the flame retardant layer comprises multiple layers of wrapped flame retardant glass cloth, the number of wrapped layers of the flame retardant glass cloth is two, and the wrapping coverage rate is 30%-40%.

[0018] Preferably, the glass fiber tape wrapping layer is formed by wrapping a single layer of glass fiber tape, with a thickness of 0.3 mm and a wrapping overlap rate of 45%-60%.

[0019] Preferably, the glass fiber tape is added with rat and ant repellent powder or rat and ant repellent agent having a pungent smell.

[0020] Compared with the existing technology, the bite-proof armored fire-proof and moisture-proof power cable of the utility model has the following significant advantages:

[0021] This new, bite-resistant, armored, fire- and moisture-proof power cable features a compact conductor profile, offering excellent moisture resistance. The cable core is dense and resists moisture retention. A flame-retardant glass cloth coated with flame-retardant paint is applied to the outer layer of the cable core wrapping tape. This tape exhibits excellent low moisture absorption, flexibility, and high strength. When the cable is heated and ignites, a hardened shell forms, which is not easily destroyed by moisture within the cable core, maintaining its flame-retardant effect. Furthermore, a longitudinal copper-plastic composite tape and a glass fiber wrapping layer are placed between the inner and outer sheaths, providing radial water resistance while effectively preventing the bite of rats and ants, maintaining the cable's integrity and adapting to outdoor installation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented 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.

[0023] Figure 1 It is a schematic diagram of the cross-sectional structure of the anti-bite armored fireproof and moisture-proof power cable shown in the present invention.

[0024] Figure 2 It is a structural schematic diagram of the anti-bite armored fireproof and moisture-proof power cable shown in the utility model. DETAILED DESCRIPTION

[0025] In order to better understand the technical content of the present invention, specific embodiments are given and described below in conjunction with the accompanying drawings.

[0026] Combine Figure 1 and Figure 2 As shown, the bite-proof armored fire-proof and moisture-proof power cable according to the embodiment of the utility model, especially the medium and low voltage cable, includes a cable core, a flame retardant layer 4 and a sheath layer. The cable core includes a wire core 1, a flame retardant filling structure 2 and a wrapping tape. The wire core 1 can be single-core or multi-core. The figure shows a three-core cable. Each wire core 1 has an independent insulating shielding layer, which can reduce electromagnetic interference between multiple conductors.

[0027] Combine Figure 1 and Figure 2 As shown, the flame retardant filling structure 2 filled between the wire cores 1 and the three mutually twisted wire cores 1 are wrapped with mica tape 3 to form a cable core with a circular cross-section.

[0028] To improve the moisture resistance of the core 1, the conductor 11 of the core 1 includes a compacted conductor. Compared with round conductors, compacted conductors have a denser twist structure and are less likely to have gaps between the conductors for water vapor to enter, thus having better water and moisture resistance.

[0029] In an optional embodiment, if Figure 2 As shown, the wire core 1 includes a conductor core 11 and an insulating layer 12. The conductor core 11 includes a three-layer wire compression structure, the first layer is a circular cross-section aluminum alloy conductor, and the second and third layers are trapezoidal cross-section aluminum alloy conductors.

[0030] The inner and outer sides of the trapezoidal cross-section aluminum alloy conductor are arc-shaped, and the two sides are flat. When twisted, the inner and outer sides fit tightly with the adjacent structures, and the sides squeeze each other to form a compact structure.

[0031] Furthermore, the insulating layer 12 comprises an inner semi-conductive layer, a polyethylene insulating layer and an outer semi-conductive layer formed by three co-extruded layers, so that each wire core is independent of each other and has good insulation and electromagnetic shielding performance.

[0032] In an optional embodiment, the flame-retardant filling structure 2 includes a foamed polyurethane filler strip that fills the space between the mica tape 3 and the cable core 1, thereby making the cable core compact. Maintaining the compact structure of the cable core improves the cable's moisture resistance and reduces the water content within the entire cable core.

[0033] Specifically, the foamed polyurethane filling strip is constructed with an irregular cross-section, including two concave arc surfaces that fit with the wire core 1 and a convex arc surface that fits with the mica tape 3. The foamed polyurethane filling strip also includes a filling strip with three concave arc surfaces that is filled between the three wire cores 1.

[0034] In this way, the cross-section of the cable core is made round and dense by the foamed polyurethane filling strip with a special cross-section. The foamed polyurethane has a flame retardant effect and can reduce the overall weight of the cable after filling. The water vapor content in the cable core is low, and part of the water vapor can be absorbed into the foamed polyurethane filling strip after heating, avoiding impact damage caused by the coke shell formed on the flame retardant layer.

[0035] In an optional embodiment, the mica tape 3 is a single-layer phlogopite tape, and the wrapping overlap rate of the phlogopite tape is 60% to 70%.

[0036] Furthermore, a flame-retardant layer 4 is coated on the outer wall of the cable core. As an example, the flame-retardant layer 4 can form a char shell when the cable is abnormally short-circuited and burns, providing isolation and protection from oxygen and flames. The tight wrapping of the phlogopite tape and the low moisture content in the cable core can effectively prevent moisture from damaging the char shell during cable combustion, maintaining the flame-retardant performance.

[0037] In an optional embodiment, the flame retardant layer 4 includes multiple layers of wrapped flame retardant glass cloth, and the number of wrapped layers of the flame retardant glass cloth is preferably two layers, and the wrapping coverage of each layer is greater than 30%, preferably 30%-40%.

[0038] Combined with attachment Figure 1 、 2 As shown, the inner sheath layer 5 is extruded onto the outer wall of the flame retardant layer 4, and a non-metallic inner sheath layer is used.

[0039] Furthermore, the armor layer 6 is coated on the outer wall of the inner sheath layer 5 .

[0040] The armor layer 6 comprises a longitudinally wrapped copper-plastic composite tape, which forms a sealed armor layer after being longitudinally wrapped.

[0041] In this way, the armor layer 6 plays a role of radial water blocking on the outer sheath layer 8 and the inner sheath layer 5, and at the same time can further improve the armoring ability of the cable and reduce the risk of being bitten by mice.

[0042] Combined with attachment Figure 1 、 2 As shown, the glass fiber tape wrapping layer 7 is wrapped around the outer wall of the armor layer 6.

[0043] Furthermore, the glass fiber tape wrapping layer 7 is formed by wrapping a single layer of glass fiber tape with a thickness of 0.3 mm and a wrapping coverage rate of 60%. In this example, the glass fiber tape is a strip-shaped material made by twisting and weaving glass fiber yarn. When rats and ants try to bite it, it produces pulverized glass slag, which damages their mouths and makes them afraid of the cable and stay away, thus having a repelling effect.

[0044] In a preferred embodiment, rat and ant repellent powder with a pungent smell can be added to the fiberglass tape to repel snakes, insects, rats, ants and other animals, such as powders of aromatherapy materials, mint, mothballs, capsaicin and other materials, so as to further enhance the cable's resistance to rat and ant gnawing, reduce the damage to the protective layer, waterproof structure, insulation layer, etc. caused by gnawing, and cause the loss of protective effect, resulting in power outages, communication interruptions, equipment stoppages and other hazards.

[0045] In another embodiment, a special rat and ant repellent, such as Bayer or BASF's, may be added to the fiberglass tape to effectively repel and poison rats and ants.

[0046] Combined with attachment Figure 1 、 2 As shown, the outer sheath layer 8 is extruded onto the outer wall of the glass fiber tape 7 .

[0047] Furthermore, outer sheath layer 8 is a nylon sheath, and in particular, the thickness ratio of outer sheath layer 8 to inner sheath layer 5 is greater than 3:1. The nylon sheath has excellent resistance to abrasion, low temperatures, chemical corrosion, hydrolysis, and aging, making it particularly suitable for laying in complex outdoor environments, maintaining the integrity and reliability of the cable structure.

[0048] In an optional embodiment, the inner sheath layer 5 includes a low-smoke, halogen-free, flame-retardant polyolefin insulation layer.

[0049] The thickness of the outer sheath layer 8 is greater than 3 mm, and in particular, is 3-5 mm.

[0050] While the present invention has been described above with reference to preferred embodiments, this is not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A bite-proof armored fire-proof and moisture-proof power cable, characterized in that: include: The flame retardant filling structure (2) filled between the wire cores (1) and the plurality of mutually twisted wire cores (1) are wrapped with a mica tape (3) to form a cable core with a circular cross-section; A flame retardant layer (4) coated on the outer wall of the cable core; An inner sheath layer (5) is extruded onto the outer wall of the flame retardant layer (4); An armor layer (6) covering the outer wall of the inner sheath layer (5); A glass fiber tape wrapping layer (7), wherein the glass fiber tape is wrapped around the outer wall of the armor layer (6) to form a high-strength flexible insulation layer; An outer sheath layer (8) is extruded onto the outer wall of the glass fiber tape wrapping layer (7); The armor layer (6) comprises a longitudinally wrapped copper-plastic composite tape, and the conductor core (11) of the wire core (1) comprises a profiled wire-pressed conductor.

2. The bite-proof armored fireproof and moisture-proof power cable according to claim 1, characterized in that: The inner sheath layer (5) comprises a low-smoke, halogen-free, flame-retardant polyolefin insulation layer, the outer sheath layer (8) comprises a nylon sheath, and the thickness ratio of the outer sheath layer (8) to the inner sheath layer (5) is greater than 3:

1.

3. The bite-proof armored fireproof and moisture-proof power cable according to claim 1, characterized in that: The thickness of the outer sheath layer (8) is 3-5 mm.

4. The bite-proof armored fireproof and moisture-proof power cable according to claim 1, characterized in that: The wire core (1) comprises a conductor core (11) and an insulating layer (12), wherein the conductor core (11) comprises a three-layer wire compression structure, wherein the first layer is an aluminum alloy conductor with a circular cross-section, the second layer and the third layer are aluminum alloy conductors with a trapezoidal cross-section, and the insulating layer (12) comprises an inner semi-conductive layer, a polyethylene insulating layer, and an outer semi-conductive layer formed by three co-extruded layers.

5. The bite-proof armored fireproof and moisture-proof power cable according to claim 1, characterized in that: The flame retardant filling structure (2) comprises a foamed polyurethane filling strip, which fills the space between the mica tape (3) and the cable core (1), making the cable core compact and round.

6. The bite-proof armored fireproof and moisture-proof power cable according to claim 5, characterized in that: The foamed polyurethane filling strip is constructed with a special-shaped cross-section, comprising two concave arc surfaces that fit with the wire core (1) and a convex arc surface that fits with the mica tape (3).

7. The bite-proof armored fireproof and moisture-proof power cable according to claim 1, characterized in that: The flame retardant layer (4) comprises multiple layers of wrapped flame retardant glass cloth, the number of wrapped layers of the flame retardant glass cloth is two, and the wrapping coverage rate is 30%-40%.

8. The bite-proof armored fireproof and moisture-proof power cable according to claim 1, characterized in that: The glass fiber tape wrapping layer (7) is formed by wrapping a single layer of glass fiber tape, has a thickness of 0.3 mm, and a wrapping overlap rate of 45%-60%.

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