Anti-rat and ant-gnaw cable

Abstract

The invention discloses a rat-ant-proof cable, comprising a waterproof cable core, an inner spacer, an outer spacer, a support sleeve, a sheath and an injection pipe. The inner spacer, the outer spacer, the support sleeve and the sheath are sequentially sleeved outside the waterproof cable core from the inside to the outside. An annular cavity formed by the support sleeve exists between the inner spacer and the outer spacer. The annular cavity is connected to the outside through the injection pipe. The rat-ant-proof slurry is injected into the annular cavity through the injection pipe. The free end of the pipe is detachably closed by a cover. The cable can achieve a long-term dual rat-ant-proof effect through a combination of physics and chemistry, and can prevent the erosion of water vapor. The cable has good safety and stability in use, is applicable to power transmission and signal transmission in various environments, and has broad application prospects.

Description

[Technical field]

[0001] The invention relates to the technical field of cables, in particular to the technical field of cables that are resistant to rat and ant gnawing. [Background technology]

[0002] Cables usually refer to cables used to transmit and distribute electrical energy. In power engineering, they are generally laid by direct burial, cable trenches or tunnels. With the continuous development of my country's power, high-speed railways, urban rail transit, industrial and mining enterprises, and urbanization, the use of cables has become more and more popular, and the chances of cables being damaged by termites and rats have also increased accordingly. Once rats and ants bite through the sheath, water or moisture will penetrate inward, causing the insulation to age due to water trees (which may be broken down in a relatively short period of time), which in turn causes power outages, serious short circuits, fires and other accidents, causing immeasurable losses. In other words, it is very important to add anti-rat and ant measures on the cables.

[0003] At present, the general measures to prevent rats and ants are to add a non-magnetic steel belt armor layer in the cable and add rat-proof and ant-proof additives in the sheath material. Among them, the non-magnetic steel belt armor layer is easy to produce sharp-angled convex edges when the cable is bent, and then it is easy to cause the sheath to crack due to stress concentration at high temperature; traditional rat-proof and ant-proof additives are toxic additives, which have been gradually eliminated by the market due to possible environmental pollution. In addition, there are designs on the market that use capsaicin as a rat-proof and ant-proof additive, such as the rat-proof and termite-proof halogen-free environmentally friendly bending-resistant cable disclosed in the utility model with announcement number CN207217148U, a new type of insect-proof and mildew-proof outdoor power cable sheath material disclosed in the invention with publication number CN105153681A, and a safe waterproof rat-proof and ant-proof power cable disclosed in the utility model with announcement number CN205722899U. However, as the laying time passes, the anti-rat and ant additives will gradually dissipate, causing the anti-rat and ant effect of the cable to gradually fail. Removing and replacing the cable is not only troublesome to operate, but also affects surrounding electricity consumption. [Summary of the invention]

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a rat and ant-proof cable, which can not only achieve a long-term dual rat and ant-proof effect by combining physical and chemical methods, but also prevent the erosion of water vapor. It has good safety and stability in use, can be used for power transmission and signal transmission in various environments, and has broad application prospects.

[0005] To achieve the above-mentioned purpose, the present invention proposes a rat- and ant-proof cable, comprising a waterproof cable core, an inner spacer, an outer spacer, a support sleeve, a sheath and an injection pipe, wherein the inner spacer, the outer spacer, the support sleeve and the sheath are sequentially arranged outside the waterproof cable core from the inside to the outside, and an annular cavity formed by the support sleeve is present between the inner spacer and the outer spacer, the annular cavity is connected to the outside through the injection pipe, the rat- and ant-proof slurry is injected into the annular cavity through the injection pipe, and the free end of the pipe is detachably closed by a cover.

[0006] Preferably, the inner and outer spacers are both polyolefin sleeves, and the sheath material is further added with anti-rat and ant additives, the cross-section of the support sleeve is wavy, and the sheath is a nylon sleeve.

[0007] Preferably, the rat and ant-proof slurry is a slurry containing capsaicin, and the rat and ant-proof additive is capsaicin.

[0008] Preferably, it also includes a monitoring pipe and a pressure monitor, wherein the monitoring pipe passes through the outer spacer and the sheath to form a monitoring passage between the annular cavity and the outside world, and the pressure monitoring head of the pressure monitor extends into the annular cavity along the monitoring pipe, and the monitoring pipe and the pressure monitor are sealed by a sealing ring.

[0009] Preferably, the waterproof cable core comprises a wire core, a first water-blocking tape, a composite shielding layer, a second water-blocking tape, a sparsely wound shielding layer, a third water-blocking tape and a flame-retardant and moisture-proof tape. The wire core is formed by twisting a number of conductors which are arranged in layers from the inside to the outside, and a first water-blocking tape is spirally wound around each layer of conductor. The composite shielding layer is extruded and coated on the outside of the first water-blocking tape located on the outermost layer, the second water-blocking tape is spirally wound around the composite shielding layer, the sparsely wound shielding layer is sparsely wound around the second water-blocking tape, the third water-blocking tape is spirally wound around the outside of the sparsely wound shielding layer, and the flame-retardant and moisture-proof tape is spirally wound around the third water-blocking tape.

[0010] Preferably, the conductor is a copper wire.

[0011] Preferably, the first water-blocking tape is a semi-conductive single-sided water-blocking tape, and the second water-blocking tape and the third water-blocking tape are both semi-conductive double-sided water-blocking tapes.

[0012] Preferably, the composite shielding layer is composed of a semiconductive non-cross-linked conductor shielding layer, a cross-linked polyethylene insulating layer and a semiconductive non-cross-linked insulating shielding layer which are co-extruded in sequence from the inside to the outside.

[0013] Preferably, the sparsely wound shielding layer is a wire sleeve woven from copper wires.

[0014] Preferably, the flame retardant and moisture-proof tape is a double-sided aluminum-plastic composite tape.

[0015] Beneficial effects of the present invention:

[0016] 1) By arranging two layers of spacers containing anti-rat and ant additives outside the waterproof cable core (i.e., inner spacer and outer spacer), and adding a nylon sheath with good strength and wear resistance as a sheath on the outermost layer, a double anti-rat and ant effect can be achieved by combining physical and chemical methods;

[0017] 2) By adding a support sleeve that can support the annular cavity between the two layers of spacers, and adopting an injection pipe that penetrates both the outer spacer and the sheath to make the annular cavity communicate with the outside, the anti-rat and ant slurry can be injected or replaced into the annular cavity through the injection pipe, thereby ensuring the long-term effectiveness of the chemical anti-rat and ant;

[0018] 3) By installing a monitoring pipe that can form a monitoring path between the ring cavity and the outside world, and allowing the pressure monitoring head of the pressure monitor to extend into the ring cavity along the monitoring pipe, the pressure change in the ring cavity can be used to sense whether the ring cavity is gnawed to the point of leakage, thereby facilitating workers to promptly inspect and repair the cable;

[0019] 4) By arranging a plurality of twisted conductors in layers from the inside to the outside to form a core, and spirally winding a semi-conductive single-sided water-blocking tape outside each layer of conductor as a first water-blocking tape, the gaps between the conductors can be densely filled with the semi-conductive water-blocking material, thereby preventing water vapor from penetrating inward;

[0020] 5) By wrapping the second and third semi-conductive double-sided water-blocking tapes outside the composite shielding layer and the sparsely wound shielding layer, when water vapor enters, the second and third water-blocking tapes can expand rapidly until the inside of the cable is tightly filled to effectively prevent further penetration of water vapor;

[0021] 6) By adding an aluminum-plastic composite tape composed of aluminum foil and plastic film on the outside of the third water-blocking tape, the aluminum-plastic composite tape can be used to provide the cable with good moisture-proof, corrosion-proof and anti-electromagnetic interference protection.

[0022] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0023] Figure 1 is a cross-sectional view of the first embodiment;

[0024] Figure 2 yes Figure 1 An enlarged schematic diagram of point A;

[0025] Figure 3 is a schematic diagram of the assembly of the wire core and the first water blocking tape of the first embodiment;

[0026] Figure 4 It is a cross-sectional view of the second embodiment.

[0027] In the figure: 1-waterproof cable core, 11-wire core, 12-first water-blocking tape, 13-semi-conductive non-cross-linked conductor shielding layer, 14-cross-linked polyethylene insulation layer, 15-semi-conductive non-cross-linked insulation shielding layer, 16-second water-blocking tape, 17-sparsely wound shielding layer, 18-third water-blocking tape, 19-flame retardant and moisture-proof tape, 2-inner spacer, 3-outer spacer, 4-support sleeve, 5-sheath, 6-injection pipe, 7-monitoring pipe, 8-pressure monitor. [Specific implementation method]

[0028] Embodiment 1:

[0029] See also Figures 1 to 3 The rat-ant-proof cable of the present invention comprises a waterproof cable core 1, an inner spacer 2, an outer spacer 3, a support sleeve 4, a sheath 5 and an injection pipe 6. The inner spacer 2, the outer spacer 3, the support sleeve 4 and the sheath 5 are sequentially sleeved outside the waterproof cable core 1 from the inside to the outside. There is an annular cavity supported by the support sleeve 4 between the inner spacer 2 and the outer spacer 3. The annular cavity is connected to the outside through the injection pipe 6. The rat-ant-proof slurry is injected into the annular cavity through the injection pipe 6. The free end of the pipe 6 is detachably closed by a cover.

[0030] The inner spacer 2 and the outer spacer 3 are both polyolefin sleeves and the sheath material is also added with anti-rat and ant additives. The cross section of the support sleeve 4 is wavy, and the sheath 5 is a nylon sleeve (the nylon sleeve has high strength and high wear resistance).

[0031] The rat and ant-proof slurry is a slurry containing capsaicin, and the rat and ant-proof additive is capsaicin. Among them, capsaicin is a natural rat and ant-proof additive and has no toxic effect on the environment and humans.

[0032] The waterproof cable core 1 includes a core 11, a first water-blocking tape 12, a composite shielding layer, a second water-blocking tape 16, a sparsely wound shielding layer 17, a third water-blocking tape 18 and a flame-retardant and moisture-proof tape 19. The core 11 is formed by twisting a plurality of conductors which are arranged in layers from the inside to the outside, and each layer of conductor is spirally wound with a first water-blocking tape 12. The composite shielding layer is extruded and coated on the outside of the first water-blocking tape 12 located on the outermost layer, the second water-blocking tape 16 is spirally wound on the outside of the composite shielding layer, the sparsely wound shielding layer 17 is sparsely wound and coated on the outside of the second water-blocking tape 16, the third water-blocking tape 18 is spirally wound on the outside of the sparsely wound shielding layer 17, and the flame-retardant and moisture-proof tape 19 is spirally wound on the outside of the third water-blocking tape 18.

[0033] The conductor is a copper wire (a second type of round compacted copper conductor conforming to the national standard GB / T 3956-2008).

[0034] The first water-blocking tape 12 is a semi-conductive single-sided water-blocking tape, and the second water-blocking tape 16 and the third water-blocking tape 18 are both semi-conductive double-sided water-blocking tapes.

[0035] The composite shielding layer is composed of a semiconductive non-crosslinked conductor shielding layer 13, a crosslinked polyethylene insulating layer 14 and a semiconductive non-crosslinked insulating shielding layer 15 which are co-extruded in sequence from the inside to the outside.

[0036] The sparsely wound shielding layer 17 is a wire sleeve woven from copper wires.

[0037] The flame retardant and moisture-proof tape 19 is a double-sided aluminum-plastic composite tape.

[0038] Embodiment 2:

[0039] See also Figure 4 The rat- and ant-proof cable of the present invention also includes a monitoring pipe 7 and a pressure monitor 8. The monitoring pipe 7 penetrates the outer spacer 3 and the sheath 5 to form a monitoring passage between the annular cavity and the outside world. The pressure monitoring head of the pressure monitor 8 extends into the annular cavity along the monitoring pipe 7. The monitoring pipe 7 and the pressure monitor 8 are sealed by a sealing ring.

[0040] The rest is the same as in the first embodiment.

[0041] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. Anti-rat and ant-biting cable, characterized by: The invention comprises a waterproof cable core (1), an inner spacer (2), an outer spacer (3), a support sleeve (4), a sheath (5) and an injection pipe (6), wherein the inner spacer (2), the outer spacer (3), the support sleeve (4) and the sheath (5) are sequentially sleeved outside the waterproof cable core (1) from the inside to the outside, an annular cavity formed by the support sleeve (4) exists between the inner spacer (2) and the outer spacer (3), the annular cavity is connected to the outside through the injection pipe (6), the annular cavity is injected with rat-ant slurry through the injection pipe (6), the free end of the injection pipe (6) is detachably closed by a cover, the inner spacer (2) and the outer spacer (3) are provided with a plurality of support sleeves (4), and the support sleeve (5) is provided with a plurality of support sleeves (4). 3) are all polyolefin sleeves and the sleeve material is also added with an anti-rat and ant additive, the cross-section of the support sleeve (4) is wavy, the sleeve (5) is a nylon sleeve, the anti-rat and ant slurry is a slurry containing an anti-rat and ant additive, and the anti-rat and ant additive is capsaicin, and also includes a monitoring pipe (7) and a pressure monitor (8), the monitoring pipe (7) penetrates the outer spacer (3) and the sleeve (5) to form a monitoring passage between the annular cavity and the outside, the pressure monitoring head of the pressure monitor (8) extends into the annular cavity along the monitoring pipe (7), and the monitoring pipe (7) and the pressure monitor (8) are sealed by a sealing ring.

2. The rat and ant-proof cable according to claim 1, characterized in that: The waterproof cable core (1) comprises a wire core (11), a first water blocking tape (12), a composite shielding layer, a second water blocking tape (16), a sparsely wound shielding layer (17), a third water blocking tape (18) and a flame retardant and moisture-proof tape (19); the wire core (11) is formed by twisting a plurality of conductors arranged in layers from the inside to the outside, and each layer of conductor is spirally wound with a first water blocking tape (12); the composite shielding layer is extruded and coated on the outside of the first water blocking tape (12) located at the outermost layer; the second water blocking tape (16) is spirally wound on the outside of the composite shielding layer; the sparsely wound shielding layer (17) is sparsely wound and coated on the outside of the second water blocking tape (16); the third water blocking tape (18) is spirally wound on the outside of the sparsely wound shielding layer (17); and the flame retardant and moisture-proof tape (19) is spirally wound on the outside of the third water blocking tape (18).

3. The rat and ant-proof cable according to claim 2, characterized in that: The conductor is a copper wire.

4. The rat and ant-proof cable according to claim 2, characterized in that: The first water-blocking tape (12) is a semi-conductive single-sided water-blocking tape, and the second water-blocking tape (16) and the third water-blocking tape (18) are both semi-conductive double-sided water-blocking tapes.

5. The rat and ant-proof cable according to claim 2, characterized in that: The composite shielding layer is composed of a semi-conductive non-cross-linked conductor shielding layer (13), a cross-linked polyethylene insulation layer (14) and a semi-conductive non-cross-linked insulation shielding layer (15) which are co-extruded in sequence from the inside to the outside.

6. The rat and ant-proof cable according to claim 2, characterized in that: The sparsely wound shielding layer (17) is a wire sleeve formed by braiding copper wires.

7. The rat and ant-resistant cable according to claim 2, characterized in that: The flame retardant and moisture-proof tape (19) is a double-sided aluminum-plastic composite tape.

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