A rat and termite proof cable for outdoor power transmission

Abstract

The application relates to the cable technical field and discloses an anti-rat and anti-termite cable for outdoor power transmission, which comprises a conductor, a cross-linked polyethylene insulation layer, a shielding layer and an outer sheath, further comprises rigid protective sleeves, metal bellows and a ventilation assembly, the rigid protective sleeves are provided in multiple, the rigid protective sleeves are sleeved outside the outer sheath to provide rigid protection for the cable, the metal bellows are provided in multiple, the metal bellows and the rigid protective sleeves are arranged at intervals, the metal bellows and the rigid protective sleeves are detachably connected to form a continuous and closed anti-rat and anti-termite barrier which can adapt to the bending laying of the cable, the ventilation assembly is arranged on some of the rigid protective sleeves to realize the ventilation and heat dissipation of the cable and prevent rats and termites from invading. The technical scheme can solve the problems that the chemical protection effect gradually decays, the physical protection has bending gaps and rats and termites are easy to drill into in the prior art.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more specifically, to a rodent- and ant-proof cable for outdoor power transmission. Background Technology

[0002] In power systems, outdoor cables are constantly threatened by rodents such as rats and termites. Once these rodents or termites break through the cable's protective layer, they can cause a series of chain reactions, including short circuits, grounding faults, and even fires, seriously threatening power supply safety and equipment reliability.

[0003] Currently, the mainstream rodent- and ant-proof cable technologies at home and abroad typically include chemical protection and physical protection. Chemical protection involves adding agents to the cable sheath to repel rodents and ants using special odors. Physical protection usually involves setting a metal armor layer or nylon sheath on the cable as an anti-biting layer to protect the inside of the cable.

[0004] The core problem with chemical protection is that repellents evaporate or degrade over time, and their protective effect diminishes year by year. When cables are mechanically damaged due to transportation, installation, or other reasons, rodents and termites will gnaw and bore into them through the damaged areas, failing to provide fundamental protection. In addition, some repellents pose a potential environmental pollution risk and do not meet environmental protection requirements. On the other hand, the steel tape armor or interlocking armor in physical protection is a mechanical interlocking structure that is not completely sealed and has tiny gaps. Small rodents or termites can crawl into these gaps, and these gaps may further widen, especially when the cable is bent or deformed by pressure. Summary of the Invention

[0005] This invention proposes a rodent- and ant-proof cable for outdoor power transmission, which solves the problem that the chemical protection effect gradually diminishes and the physical protection has gaps at bends, making it easy for rodents and ants to crawl in.

[0006] The technical solution of the present invention is as follows: An outdoor power transmission rodent- and termite-proof cable includes a conductor, a cross-linked polyethylene insulation layer, a shielding layer, and an outer sheath. The cross-linked polyethylene insulation layer wraps around the conductor, and a filler is disposed between the cross-linked polyethylene insulation layer and the shielding layer. The outer sheath wraps around the shielding layer. The cable also includes: A rigid protective sleeve, wherein multiple rigid protective sleeves are provided and are fitted over the outer sheath to provide rigid protection for the cable; Multiple metal corrugated pipes are provided, and the metal corrugated pipes and the rigid protective sleeve are spaced apart. The metal corrugated pipes and the rigid protective sleeve are detachably connected to form a continuous and sealed rodent and ant-proof barrier while adapting to the bending and laying of cables. A ventilation assembly, disposed on several of the multiple rigid protective sleeves, is used to ventilate and dissipate heat from the cable while preventing rodents and ants from entering. The ventilation assembly includes: A ventilation duct is installed on the rigid protective sleeve, and there is a ventilation gap between the rigid protective sleeve and the outer protective sleeve. The ventilation gap communicates with the outside through the ventilation duct. A cooling fan, which is installed inside the ventilation duct to exhaust air in a directional manner; A protective component, disposed at the end of the ventilation duct, is used to prevent rodents and ants from entering and to maintain unobstructed ventilation. The protective component includes: A protective cover is detachably mounted on the end of the ventilation cylinder. The protective cover has multiple ventilation openings, and baffles are inclinedly mounted at the ventilation openings. A dustproof net is fixedly installed inside the protective cover and can filter dust and block rodents and ants.

[0007] To further prevent rodents and ants from entering, a repelling component is also included. This repelling component is driven by the ventilation component to repel rodents and ants. The repelling component includes: A rotating shaft is coaxially and fixedly connected to the cooling fan, and the rotating shaft passes through the protective cover; A driving frame, wherein multiple driving frames are provided, the driving frames are fixedly connected to the rotating shaft, and the driving frames are close to the outer wall of the ventilation duct.

[0008] To prevent foreign objects from interfering with the normal operation of the ventilation and repellent components, a protective cover is fixedly installed on the rigid protective sleeve on which the ventilation components are installed, and the ventilation components and the repellent components are located inside the protective cover.

[0009] To reduce rainwater entering the cable through the ventilation duct, a rainproof awning is detachably installed on the rigid protective sleeve equipped with ventilation components. The protective cover is located inside the rainproof awning, which is tapered, and there is a ventilation gap between the rainproof awning and the protective cover.

[0010] To enable detachable connection and ventilation circulation between the metal bellows and the rigid protective sleeve, connecting rings are fixedly connected to the ends of both the rigid protective sleeve and the metal bellows. The connecting rings are in contact with the outer side of the outer protective sleeve, and adjacent connecting rings are detachably connected. Ventilation holes are provided on the connecting rings to enable ventilation between the metal bellows and the rigid protective sleeve.

[0011] The working principle and beneficial effects of this invention are as follows: 1. In this invention, a continuous and sealed rodent and termite-proof barrier is formed by a structure in which a rigid protective sleeve and a metal corrugated pipe are spaced apart and detachably connected. The rigid protective sleeve provides high-strength anti-biting ability, and the metal corrugated pipe avoids the gaps caused by bending in traditional armor layers while ensuring bending performance. This completely eliminates the possibility of rodents, termites, etc., entering the cable through gaps and solves the problem of gap expansion caused by bending or pressure in existing physical protection.

[0012] 2. In this invention, a ventilation gap is formed between the rigid protective sleeve and the outer sheath by means of the connecting ring and the ventilation holes provided thereon, and the cooling fan is used for directional exhaust, which can remove the heat generated by the cable operation in time, reduce the temperature rise of the cable, and extend its service life. At the same time, the inclined baffle on the protective cover and the internal dustproof net can not only ensure smooth ventilation, but also effectively block rodents, dust and other pests from entering, thus achieving synergistic optimization of rodent prevention and ventilation and heat dissipation.

[0013] 3. In this invention, by setting up a repelling component, the cooling fan drives the rotating shaft and the repelling frame to rotate. The repelling frame is close to the outer wall of the ventilation duct, which can create dynamic physical interference near the ventilation duct and actively drive away rodents and ants that try to approach. In particular, it prevents rodents and ants from climbing onto the ventilation duct and entering the ventilation duct, thereby further enhancing the anti-intrusion effect.

[0014] 4. In this invention, the design of the protective cover and rainproof eaves provides external protection for the ventilation components and the repelling components, preventing rainwater, foreign objects, etc. from entering, and further reducing the entry of rodents and ants, while maintaining ventilation gaps to ensure the long-term stable operation of the cable in harsh outdoor environments. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the rigid protective sleeve, metal corrugated pipe, connecting ring, and rainproof eaves of the present invention. Figure 3 This is an exploded structural diagram of the rigid protective sleeve, metal bellows, connecting ring, and rainproof awning of the present invention. Figure 4 This is a schematic diagram of the rigid protective sleeve, protective cover, rainproof eaves, and mounting screw of the present invention. Figure 5 This is a schematic diagram of the rigid protective sleeve, connecting ring, protective cover, and rain shield of the present invention. Figure 6 This is a schematic diagram of the ventilation component of the present invention; Figure 7This is a schematic diagram of the ventilation component and the repellent component of the present invention; Figure 8 For the present invention Figure 4 A magnified schematic diagram of the structure at point A in the middle.

[0017] In the picture: 1. Conductor; 2. Cross-linked polyethylene insulation layer; 3. Shielding layer; 4. Outer sheath; 5. Rigid protective sleeve; 6. Metal corrugated pipe; 7. Connecting ring; 8. Protective cover; 9. Rainproof eaves; 10. Mounting screw; 11. Rain guard; 101. Ventilation duct; 102. Cooling fan; 201. Protective cover; 202. Dustproof net; 203. Baffle; 301. Rotating shaft; 302. Driving frame. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figure 1 As shown, this embodiment proposes a rodent-proof cable for outdoor power transmission, including a conductor 1, a cross-linked polyethylene insulation layer 2, a shielding layer 3, and an outer sheath 4. The cross-linked polyethylene insulation layer 2 is wrapped around the outside of the conductor 1, and a filler is provided between the cross-linked polyethylene insulation layer 2 and the shielding layer 3. The outer sheath 4 is wrapped around the outside of the shielding layer 3. It also includes a rigid protective sleeve 5, a metal corrugated pipe 6, and a ventilation assembly.

[0020] The cross-linked polyethylene insulation layer 2 is made by melt blending and extrusion cross-linking of the following components in parts by weight: 100 parts low-density polyethylene resin, 2 parts cross-linking agent dicumyl peroxide, 5 parts rodent- and termite-repellent functional masterbatch (the effective component is nonanoic acid vanillin-type synthetic capsaicin, loaded on a porous silica carrier), 20 parts halogen-free flame retardant (including 15 parts guanidine phosphate-modified montmorillonite and 5 parts zinc borate), 0.5 parts composite antioxidant, and 0.3 parts anti-scorching agent. During preparation, the above components are added to a mixer according to the specified ratio and mixed evenly at 120~140℃. The mixture is then granulated using a twin-screw extruder to obtain the cross-linked polyethylene insulation layer 2. The insulation material is made of cross-linked polyethylene. It is coated on the outside of conductor 1 through a three-layer co-extrusion process and then cross-linked through a continuous vulcanization pipeline to form cross-linked polyethylene insulation layer 2. By adding capsaicin-based rodent and ant repellent masterbatch with silica as carrier to the insulation layer matrix, the insulation layer has the ability to actively repel rodents and ants. Together with the rigid protective sleeve 5 and the metal corrugated pipe 6, it forms a physical barrier to constitute a dual protection system. The synthetic capsaicin is adsorbed in the porous silica carrier and can be continuously and slowly released during the decades of cable operation, avoiding the problem of the protective effect decay caused by the rapid volatilization of traditional chemical protective agents.

[0021] like Figures 1 to 5 As shown, multiple rigid protective sleeves 5 are provided. The rigid protective sleeves 5 are fitted outside the outer sheath 4 to provide rigid protection for the cable. The rigid protective sleeves 5 can be cylindrical sleeves made of stainless steel or galvanized steel and fitted outside the outer sheath 4. Their inner diameter is slightly larger than the outer diameter of the outer sheath 4, thereby forming a ventilation gap. The rigid protective sleeves 5 provide rigid protection for the cable and prevent rodents and ants from gnawing on it.

[0022] Multiple metal corrugated pipes 6 are provided, and the metal corrugated pipes 6 and rigid protective sleeves 5 are spaced apart. The metal corrugated pipes 6 and rigid protective sleeves 5 are detachably connected to form a continuous and sealed rodent-proof barrier that can accommodate the bending of the cable. The metal corrugated pipes 6 can also provide anti-biting protection. In sections where the cable needs to be laid in a bending manner, the metal corrugated pipes 6 can provide bending freedom. At the same time, the rigid protective sleeves 5 and metal corrugated pipes 6 are connected to form a continuous and sealed rodent-proof barrier to prevent rodents from entering through the gaps.

[0023] To achieve detachable connection and ventilation circulation between the metal corrugated pipe 6 and the rigid protective sleeve 5, connecting rings 7 are fixedly connected to the ends of both the rigid protective sleeve 5 and the metal corrugated pipe 6. The connecting rings 7, the rigid protective sleeve 5, and the metal corrugated pipe 6 can be welded or integrally formed. The connecting rings 7 are in contact with the outer side of the outer sheath 4. Adjacent connecting rings 7 are detachably connected by bolts, snaps, or threads. Ventilation holes are provided on the connecting rings 7 to allow ventilation between the metal corrugated pipe 6 and the rigid protective sleeve 5. The ventilation holes allow air circulation between the internal space of the metal corrugated pipe 6 and the internal space of the rigid protective sleeve 5, thereby facilitating the ventilation and heat dissipation of the cable. Installation markings are provided on the connecting rings 7 to facilitate accurate installation by on-site construction personnel and ensure the alignment of the ventilation holes of the connecting rings 7.

[0024] A ventilation assembly is installed on several of the multiple rigid protective sleeves 5. For example, a rigid protective sleeve 5 with a ventilation assembly is installed every 20-50 meters to achieve cable ventilation and heat dissipation, while preventing rodents and ants from entering. The ventilation assembly includes a ventilation cylinder 101, a cooling fan 102, and protective components. The ventilation cylinder 101 is installed on the rigid protective sleeve 5, penetrating and sealing it. A ventilation gap exists between the rigid protective sleeve 5 and the outer sheath 4, communicating with the outside through the ventilation cylinder 101. The cooling fan 102 is installed inside the ventilation cylinder 101 for directional exhaust. Protective components are located at the end of the ventilation cylinder 101 to prevent rodents and ants from entering and maintain unobstructed ventilation. The protective components include a protective cover 201 and a dustproof net 202. The protective cover 201 is detachable by threads or snaps. The protective cover 201, located at the end of the ventilation duct 101, has multiple ventilation openings. A baffle 203 is inclinedly installed at each ventilation opening. A dustproof net 202 is fixedly installed inside the protective cover 201, which can filter dust and block rodents. The rotation of the cooling fan 102 allows the airflow between the rigid protective sleeve 5 and the metal corrugated pipe 6 and the outer sheath 4 to be discharged outward, thereby achieving ventilation and heat dissipation for the cable and reducing cable temperature rise. At the same time, the cooling fan 102 blows air outward, forming an outward diffused airflow barrier at the ventilation opening, blocking rodents and dust from approaching, further reducing rodent intrusion. The inclined setting of the baffle 203 can reduce the entry of moisture. The cooling fan 102 is equipped with a power module, which can integrate solar panel power supply or external power supply to power the cooling fan 102. A temperature sensor can also be added to provide feedback on the temperature status and regulate the start, stop and speed of the cooling fan 102.

[0025] To further prevent rodents and ants from entering, a repelling component is also included. This component is driven by the ventilation system to repel rodents and ants. Figures 6 to 8As shown, the repelling assembly includes a rotating shaft 301 and a repelling frame 302. The rotating shaft 301 and the cooling fan 102 are coaxially and fixedly connected. The rotating shaft 301 passes through the protective cover 201. Multiple repelling frames 302 are provided and fixedly connected to the rotating shaft 301. The repelling frames 302 are close to the outer wall of the ventilation duct 101. When the cooling fan 102 rotates, the rotating shaft 301 drives the repelling frames 302 to rotate, forming a sweeping motion outside the ventilation duct 101, actively repelling approaching rodents and ants, especially blocking the climbing path of rodents and ants along the ventilation duct 101, further reducing the entry of rodents and ants through the ventilation opening.

[0026] To prevent foreign objects from interfering with the normal operation of the ventilation and deflecting components, a protective cover 8 is fixedly installed on the rigid protective sleeve 5 on which the ventilation components are installed. The ventilation and deflecting components are located inside the protective cover 8. To reduce rainwater entering the cable through the ventilation duct 101, a rainproof eave 9 is detachably installed on the rigid protective sleeve 5 on which the ventilation components are installed. The rainproof eave 9 is rotatably connected to a mounting screw 10, which is threadedly connected to the rigid protective sleeve 5. The protective cover 8 is located inside the rainproof eave 9, which is tapered. There is a ventilation gap between the rainproof eave 9 and the protective cover 8. The protective cover 8 and the rainproof eave 9 enclose the ventilation duct 101 and the protective cover. The 201 and the drive frame 302 are covered inside to prevent external flying stones, branches, etc. from scratching the drive frame 302 and other components during outdoor cable laying or use, thus avoiding damage or obstruction of the normal rotation of the cooling fan 102 and the drive frame 302. When the rain cover 9 is in the upper position, rainwater can slide down the conical slope and not seep into the interior of the ventilation duct 101. The end of the rain cover 9 is close to the surface of the rigid protective sleeve 5, and the rigid protective cover 8 is also fixedly equipped with a rain shield 11 on the outside of the rain cover 9. When the rain cover 9 is in the lower position, the rigid protective cover 8 and the rain shield 11 cover the rain cover 9 and prevent rainwater from entering the interior of the rain cover 9.

[0027] The working principle or usage process of this rodent-proof cable for outdoor power transmission is as follows: During cable laying, select an appropriate number of rigid protective sleeves 5 and metal corrugated pipes 6 according to the site requirements, i.e. the cable length requirements. Alternately put the rigid protective sleeves 5 and metal corrugated pipes 6 onto the outer sheath 4 through the connecting rings 7 and lock them. For sections that require heat dissipation, install the rigid protective sleeves 5 with ventilation components in appropriate positions. Seal the ventilation holes on the connecting rings 7 at the ends by covering or blocking them to prevent rodents and ants from entering through the ventilation holes. After the cable is energized, the internal conductor 1 heats up, and the heat is transferred to the ventilation gap between the outer sheath 4 and the rigid protective sleeve 5. The cooling fan 102 is started periodically or continuously to exhaust the hot air in the gap to the outside through the ventilation tube 101, effectively reducing the cable temperature. A ventilation gap for heat dissipation is formed between the protective cover 8 and the rainproof cover 9. At the same time, the protective cover 8, the rainproof cover and the rain shield 11 protect the ventilation tube 101, the protective cover 201 and the driving frame 302 from rain. While the cooling fan 102 is working, the rotating shaft 301 drives the repelling frame 302 to rotate, forming a dynamic barrier near the outer wall of the ventilation duct 101. When rodents and ants try to approach the ventilation opening, they will be hit or frightened away by the rotating repelling frame 302. The baffle 203 and dustproof net 202 on the protective cover 201 further prevent rodents and ants from entering the ventilation duct 101. When ventilation is not required or maintenance is needed, the rain cover 9 can be opened, the protective cover 201 removed, the dustproof net 202 taken out for cleaning, or the cooling fan 102 can be replaced. Since the physical barrier formed by the rigid protective sleeve 5 and the metal corrugated pipe 6 is completely sealed, even if rodents and ants gnaw on the outer sheath 4, they cannot break through the metal material, thus ensuring the long-term safe operation of the cable.

[0028] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An outdoor power transmission rodent-proof cable, comprising a conductor (1), a cross-linked polyethylene insulation layer (2), a shielding layer (3), and an outer sheath (4), wherein the cross-linked polyethylene insulation layer (2) wraps around the conductor (1), a filler is provided between the cross-linked polyethylene insulation layer (2) and the shielding layer (3), and the outer sheath (4) wraps around the shielding layer (3), characterized in that, Also includes: A rigid protective sleeve (5) is provided in multiple forms. The rigid protective sleeve (5) is fitted over the outer sheath (4) to provide rigid protection for the cable. Metal corrugated pipe (6), multiple metal corrugated pipes (6) are provided, the metal corrugated pipe (6) and the rigid protective sleeve (5) are spaced apart, the metal corrugated pipe (6) and the rigid protective sleeve (5) are detachably connected to form a continuous and sealed rodent and ant barrier while adapting to the bending and laying of the cable. A ventilation assembly is provided on some of the rigid protective sleeves (5) to enable ventilation and heat dissipation of the cable, while preventing rodents and ants from entering.

2. The rodent-proof cable for outdoor power transmission according to claim 1, characterized in that, The ventilation assembly includes: Ventilation duct (101), the ventilation duct (101) is installed on the rigid protective sleeve (5), there is a ventilation gap between the rigid protective sleeve (5) and the outer protective sleeve (4), the ventilation gap is connected to the outside through the ventilation duct (101); A cooling fan (102) is installed inside the ventilation duct (101) to provide directional exhaust air. A protective component is provided at the end of the ventilation duct (101) to prevent rodents and ants from entering and to maintain unobstructed ventilation.

3. The rodent-proof cable for outdoor power transmission according to claim 2, characterized in that, The protective component includes: A protective cover (201) is detachably disposed at the end of the ventilation cylinder (101). The protective cover (201) has multiple ventilation openings, and a baffle (203) is obliquely disposed at each ventilation opening. A dustproof net (202) is fixedly installed inside the protective cover (201) and can filter dust and block rodents and ants.

4. The rodent-proof cable for outdoor power transmission according to claim 3, characterized in that, It also includes a repelling component that is driven by the ventilation component to repel rodents and ants.

5. The rodent-proof cable for outdoor power transmission according to claim 4, characterized in that, The driving-away component includes: A rotating shaft (301) is coaxially and fixedly connected to the cooling fan (102), and the rotating shaft (301) passes through the protective cover (201). A driving frame (302) is provided in multiple ways. The driving frame (302) is fixedly connected to the rotating shaft (301) and is close to the outer wall of the ventilation duct (101).

6. The rodent- and ant-proof cable for outdoor power transmission according to claim 5, characterized in that, A protective cover (8) is fixedly installed on the rigid protective sleeve (5) on which the ventilation component is installed, and the ventilation component and the repellent component are located inside the protective cover (8).

7. The rodent-proof cable for outdoor power transmission according to claim 6, characterized in that, A rain cover (9) is detachably provided on the rigid protective sleeve (5) equipped with ventilation components. The protective cover (8) is located inside the rain cover (9). The rain cover (9) is conical, and there is a ventilation gap between the rain cover (9) and the protective cover (8).

8. The rodent-proof cable for outdoor power transmission according to claim 1, characterized in that, Both the rigid protective sleeve (5) and the metal bellows (6) are fixedly connected to a connecting ring (7). The connecting ring (7) contacts the outer side of the outer sheath (4). Two adjacent connecting rings (7) are detachably connected. The connecting ring (7) has a vent hole to allow ventilation of the metal bellows (6) and the rigid protective sleeve (5).

Images