Medium-voltage power cable with water blocking function

Abstract

The utility model discloses a medium-voltage power cable with a water-blocking function, which relates to the technical field of medium-voltage power cables and comprises an external thread groove arranged outside a medium-voltage power cable protection sheath main body. According to the device, the flexible shell is installed to carry out isolation protection on the part, needing to be protected, of the medium-voltage power cable protection sheath body, the medium-voltage power cable protection sheath body is prevented from being scratched by foreign objects, it is guaranteed that the medium-voltage power cable protection sheath body is not damaged, direct contact between rainwater and the medium-voltage power cable protection sheath body is avoided, and the service life of the medium-voltage power cable protection sheath body is prolonged. The flexible rolling sleeve is installed, so that when branches rub the device under the action of wind power, the flexible rolling sleeve can roll, the branches are prevented from directly rubbing the medium-voltage power cable protection outer skin body, the medium-voltage power cable protection outer skin body is prevented from being damaged, rainwater is prevented from entering the device, and the service life of the medium-voltage power cable protection outer skin body is prolonged. Therefore, the safety and waterproofness of the device are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of medium-voltage power cable technology, specifically a medium-voltage power cable with water-blocking function. Background Technology

[0002] Medium-voltage cables are conductors used to transmit electricity and energy at medium voltages, and are widely used in power systems and other fields. Medium-voltage cables mainly consist of three parts: a conductor, an insulation layer, and a sheath, as well as filler material. Copper is commonly used as the conductive material for the conductor. The insulation layer, located between the conductor and the sheath, primarily serves to isolate current and prevent leakage. The insulation layer of a medium-voltage cable generally consists of three layers: a conductor shielding layer, an insulating material, and an insulating shielding layer. The sheath protects the cable from external physical and chemical damage, while the filler material fills the internal voids of the cable, enhancing its mechanical strength and aging resistance. Medium-voltage cables typically operate between 6KV and 33KV, offering higher transmission capacity and long-distance transmission capabilities to meet the needs of various practical applications.

[0003] Existing medium-voltage power cables, which use conductors, insulation layers, shielding layers, and outer protective layers, often employ a single plastic or rubber outer protective layer, which has poor moisture resistance. Under humid conditions, water can easily seep into the inside of the medium-voltage power cable, causing leakage.

[0004] For example, the Chinese authorized patent with announcement number CN 116504449 A (a medium-voltage power cable with water-blocking function): a waterproof combination structure is formed by interlacing plastic and metal layers through a first blocking layer, a first metal separator layer, a second blocking layer, and a second metal separator layer. Compared with using a single plastic or rubber layer for waterproofing, this effectively improves the waterproofness and reliability of the medium-voltage power cable. At the same time, using the first and second blocking layers to form a plastic layer as the internal waterproof layer of the cable, combined with the rubber layer as the outermost protective layer, can improve the elasticity and life of the medium-voltage power cable, reduce the difficulty of laying, and improve the practicality of the medium-voltage power cable. This technical solution solves the above problems.

[0005] However, the technical solution of this utility model still has some technical problems. When the medium-voltage power cable is used in suburban areas, there are a lot of trees. As the trees grow, the branches of the trees can easily come into contact with the medium-voltage power cable. During the rainy season, due to the strong and frequent wind and rain, the wind blows the branches and causes them to sway, resulting in the branches constantly rubbing against the outside of the medium-voltage power cable. This makes the outside of the medium-voltage power cable easily damaged, which in turn allows rainwater to easily enter the inside of the medium-voltage power cable through the damaged area, causing the medium-voltage power cable to leak electricity and thus causing a safety accident.

[0006] Therefore, a medium-voltage power cable with water-blocking function is proposed. Utility Model Content

[0007] The purpose of this invention is to provide a medium-voltage power cable with water-blocking function to solve the problem mentioned in the background art. When medium-voltage power cables are used in suburban areas, due to the large number of trees, the branches of the trees can easily come into contact with the medium-voltage power cable as they grow. During the rainy season, due to the strong and frequent wind and rain, the branches sway and rub against the outside of the medium-voltage power cable, making the outside of the medium-voltage power cable easily damaged. This allows rainwater to easily enter the inside of the medium-voltage power cable through the damaged area, causing leakage and potentially leading to safety accidents.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a medium-voltage power cable with water-blocking function, comprising a medium-voltage power cable protective outer sheath body:

[0009] An external threaded groove is provided on the outside of the protective outer sheath of the medium-voltage power cable. A flexible shell is provided on the outside of the protective outer sheath of the medium-voltage power cable. An internal threaded boss is provided on the inner wall of the flexible shell. The internal threaded boss and the flexible shell are integrally formed. The internal threaded boss and the external threaded groove are connected in a fit. Several anti-wear balls are rolled on the outside of the flexible shell through a slot.

[0010] A flexible rolling sleeve is disposed outside the flexible outer shell. The inner wall of the flexible rolling sleeve is provided with several mating inner grooves. The anti-wear balls roll inside the mating inner grooves. Several bird-repelling reflectors are disposed on the outer wall of the mating inner grooves at an inclination of five degrees. The bird-repelling reflectors are bonded to the mating inner grooves.

[0011] A rubber connector is installed at the lower end of a flexible shell via a slot. Both ends of the rubber connector are fitted with internal springs via spiral slots. A blocking bracket is fixedly installed at the end of the internal spring away from the flexible shell.

[0012] Preferably, the inner part of the protective outer sheath of the medium-voltage power cable is provided with a shielding layer, and the shielding layer is fixedly connected to the protective outer sheath of the medium-voltage power cable.

[0013] Preferably, the shielding layer has an internal filling layer inside, and the internal filling layer is fixedly connected to the shielding layer.

[0014] Preferably, the inner filling layer has six high-temperature flame-retardant layers inside, and the high-temperature flame-retardant layers are fixedly connected to the inner filling layer.

[0015] Preferably, the inner filling layer has a blocking layer inside, and the blocking layer is fixedly connected to the inner filling layer.

[0016] Preferably, the blocking layer has an internal insulating layer inside, and the internal insulating layer is fixedly connected to the blocking layer.

[0017] Preferably, a conductive inner core is disposed inside the inner insulating layer, and the conductive inner core is fixedly connected to the inner insulating layer.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model, by installing a flexible outer shell, can isolate and protect the parts of the medium-voltage power cable protective sheath that need protection, preventing the sheath from being scratched by external objects and ensuring that it will not be damaged. It also, to a certain extent, prevents rainwater from directly contacting the sheath, preventing leakage and enhancing the device's safety and waterproofness. Installing anti-wear balls reduces friction between the flexible rolling sleeve and the flexible outer shell, ensuring the flexible rolling sleeve rolls more smoothly outside the shell, guaranteeing stable device performance. Furthermore, when tree branches rub against the device under wind force, the flexible rolling sleeve rolls, preventing direct friction and damage to the sheath. It also prevents rainwater from entering the device, thus preventing leakage and enhancing its safety and waterproofness.

[0020] 2. By installing a bird-repelling reflector, the flexible rolling sleeve can reflect sunlight when rotating, thereby driving away birds and preventing them from staying on the top of the device for a long time, thus enhancing the practicality of the device. The installation of an internal spring can pull the blocking bracket, so that the blocking bracket abuts against both ends of the flexible shell, thereby preventing the rubber connector from separating from the flexible shell and ensuring that the flexible shell is stably installed on the outside of the medium voltage power cable protection sheath, thus ensuring the stability of the device's function. Attached Figure Description

[0021] Figure 1 This is a three-dimensional perspective view of a medium-voltage power cable with water-blocking function according to the present invention.

[0022] Figure 2 This is an exploded view of the structure of a medium-voltage power cable with water-blocking function according to this utility model;

[0023] Figure 3 This is a half-sectional view of a medium-voltage power cable with water-blocking function according to this utility model.

[0024] Figure 4 This is a schematic diagram of the structure of the flexible shell of this utility model;

[0025] Figure 5This diagram shows the fit between the rubber connector and the inner spring of this utility model.

[0026] Figure 6 for Figure 2 Enlarged view of section B.

[0027] In the diagram: 1. Main body of the protective outer sheath of medium-voltage power cable; 2. Shielding layer; 3. Conductive inner core; 4. Internal insulation layer; 5. Blocking layer; 6. High-temperature flame-retardant layer; 7. Internal filling layer; 8. Flexible outer shell; 9. Anti-wear ball bearings; 10. Flexible rolling sleeve; 11. Bird deterrent reflector; 12. Fitting inner groove; 13. Rubber connector plug; 14. Blocking bracket; 15. Internal threaded boss; 16. Internal spring; 17. External threaded groove. Detailed Implementation

[0028] 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.

[0029] Please see Figure 1-6 One embodiment of this utility model is a medium-voltage power cable with water-blocking function, comprising a medium-voltage power cable protective outer sheath body 1:

[0030] The external threaded groove 17 is located on the outside of the medium-voltage power cable protective sheath body 1. A flexible shell 8 is provided on the outside of the medium-voltage power cable protective sheath body 1. The installation of the flexible shell 8 can isolate and protect the part of the medium-voltage power cable protective sheath body 1 that needs protection, prevent the medium-voltage power cable protective sheath body 1 from being scratched by foreign objects, ensure that the medium-voltage power cable protective sheath body 1 will not be damaged, and at the same time, to a certain extent, prevent rainwater from directly contacting the medium-voltage power cable protective sheath body 1, prevent the medium-voltage power cable protective sheath body 1 from leakage, and enhance the safety and waterproofness of the device. The inner wall of the flexible shell 8 is provided with an internal threaded boss 15. The internal threaded boss 15 and the flexible shell 8 are integrally formed and connected with the external threaded groove 17. Several anti-wear balls 9 are rolled on the outside of the flexible shell 8 through the slot. The installation of anti-wear balls 9 can reduce the friction between the flexible rolling sleeve 10 and the flexible shell 8, ensure that the flexible rolling sleeve 10 can roll more smoothly on the outside of the flexible shell 8, and ensure the stability of the device's performance.

[0031] The flexible rolling sleeve 10 is set outside the flexible outer shell 8. When the flexible rolling sleeve 10 is installed, it can roll when the branches rub against the device under the action of wind, preventing the branches from directly rubbing against the protective outer shell 1 of the medium voltage power cable, thereby avoiding damage to the protective outer shell 1 of the medium voltage power cable, preventing rainwater from entering the device and causing leakage, and enhancing the safety and waterproofness of the device. The inner wall of the flexible rolling sleeve 10 is provided with several mating inner grooves 12, and the anti-wear ball 9 rolls inside the mating inner grooves 12. Several bird-repelling reflectors 11 are set at an inclination of five degrees on the outer wall of the mating inner grooves 12. When the flexible rolling sleeve 10 rotates, the bird-repelling reflectors 11 can reflect sunlight, thereby driving away birds and preventing birds from staying on the top of the device for a long time, thus enhancing the practicality of the device. The bird-repelling reflectors 11 are glued to the mating inner grooves 12.

[0032] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 The rubber connector 13 is installed at the lower end of the flexible housing 8 via a slot. Both ends of the rubber connector 13 are fitted with internal springs 16 via spiral slots. Installing the internal springs 16 pulls the blocking brackets 14, causing the blocking brackets 14 to abut against both ends of the flexible housing 8, thus preventing the rubber connector 13 from separating from the flexible housing 8. This ensures the flexible housing 8 is stably installed outside the medium-voltage power cable protection sheath body 1, guaranteeing the stability of the device's function. The blocking bracket 14 is fixedly installed at the end of the internal spring 16 furthest from the flexible housing 8. A screen is installed inside the medium-voltage power cable protection sheath body 1. The shielding layer 2 is fixedly connected to the outer sheath of the medium-voltage power cable body 1. The shielding layer 2 has an inner filling layer 7 inside, which is fixedly connected to the shielding layer 2. The inner filling layer 7 has six high-temperature flame-retardant layers 6 inside, which are fixedly connected to the inner filling layer 7. The inner filling layer 7 has an inner blocking layer 5 inside, which is fixedly connected to the inner filling layer 7. The inner blocking layer 5 has an inner insulating layer 4 inside, which is fixedly connected to the blocking layer 5. The inner insulating layer 4 has a conductive inner core 3 inside, which is fixedly connected to the inner insulating layer 4.

[0033] Working principle: During use, the operator sets up the device on the top of a utility pole. In areas with trees, the operator opens the flexible outer shell 8 and then places it over the outer body 1 of the medium-voltage power cable protective sheath, ensuring the internal threaded boss 15 on the inner wall of the flexible outer shell 8 mates with the external threaded groove 17 on the outer body 1. The operator then inserts the rubber connector 13 into the lower notch of the flexible outer shell 8 and screws the inner spring 16, which has the blocking bracket 14 installed, into the spiral grooves at both ends of the rubber connector 13. Finally, the operator opens the flexible rolling sleeve 10, placing it over the upper part of the flexible outer shell 8, allowing the anti-wear roller to... The bead 9 is placed in the mating groove 12 on the inner wall of the flexible rolling sleeve 10 to complete the partial protective installation. During the rainy season, the wind blows the tree branches, causing them to rub against the flexible rolling sleeve 10. This friction causes the flexible rolling sleeve 10 to rotate, protecting the medium-voltage power cable protective sheath 1 and preventing damage to it. This also prevents rainwater from entering the device, preventing leakage and potential safety accidents, thus increasing the device's safety and waterproofing. The flexible outer shell 8 can isolate and protect the parts of the medium-voltage power cable protective sheath 1 that need protection, preventing damage to the main body of the medium-voltage power cable protective sheath. The device is designed to prevent damage to the outer sheath of the medium-voltage power cable from scratches by external objects. It also helps to prevent rainwater from directly contacting the outer sheath, thus preventing leakage and enhancing the device's safety and waterproofing. The installation of anti-wear balls 9 reduces friction between the flexible rolling sleeve 10 and the flexible outer shell 8, ensuring smoother rolling of the flexible rolling sleeve 10 outside the flexible outer shell 8 and stable device performance. Furthermore, the flexible rolling sleeve 10 prevents direct friction between branches and the outer sheath when the device is rubbed by wind. 1. This prevents damage to the main body 1 of the medium-voltage power cable protection sheath, prevents rainwater from entering the device and causing leakage, and enhances the safety and waterproofness of the device. The bird-repelling reflector 11 can reflect sunlight when the flexible rolling sleeve 10 rotates, thereby driving away birds and preventing them from staying on the top of the device for a long time, thus enhancing the practicality of the device. The internal spring 16 can pull the blocking bracket 14, so that the blocking bracket 14 abuts against both ends of the flexible shell 8, thereby preventing the rubber connecting plug 13 from separating from the flexible shell 8, ensuring that the flexible shell 8 is stably installed on the outside of the main body 1 of the medium-voltage power cable protection sheath, and ensuring the stability of the device's function.

[0034] 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 medium-voltage power cable with water-blocking function, comprising a medium-voltage power cable protective outer sheath body (1), characterized in that: An external threaded groove (17) is provided on the outside of the medium-voltage power cable protective outer sheath body (1). A flexible shell (8) is provided on the outside of the medium-voltage power cable protective outer sheath body (1). An internal threaded boss (15) is provided on the inner wall of the flexible shell (8). The internal threaded boss (15) and the flexible shell (8) are integrally formed. The internal threaded boss (15) and the external threaded groove (17) are connected in a fit. Several anti-wear balls (9) are rolled on the outside of the flexible shell (8) through a slot. A flexible rolling sleeve (10) is disposed outside the flexible outer shell (8). The inner wall of the flexible rolling sleeve (10) is provided with a plurality of mating inner grooves (12). The anti-wear ball (9) rolls inside the mating inner groove (12). The outer wall of the mating inner groove (12) is inclined at five degrees and provided with a plurality of bird-repelling reflectors (11). The bird-repelling reflectors (11) are bonded to the mating inner groove (12). A rubber connector (13) is installed at the lower end of the flexible shell (8) through a slot. Both ends of the rubber connector (13) are fitted with an inner spring (16) through a spiral slot. A blocking bracket (14) is fixedly installed at the end of the inner spring (16) away from the flexible shell (8).

2. A medium-voltage power cable with water-blocking function according to claim 1, characterized in that: The inner part of the protective outer sheath of the medium-voltage power cable (1) is provided with a shielding layer (2), and the shielding layer (2) is fixedly connected to the protective outer sheath of the medium-voltage power cable (1).

3. A medium-voltage power cable with water-blocking function according to claim 2, characterized in that: The shielding layer (2) has an internal filling layer (7) inside, and the internal filling layer (7) is fixedly connected to the shielding layer (2).

4. A medium-voltage power cable with water-blocking function according to claim 3, characterized in that: The interior of the inner filling layer (7) is provided with six high-temperature flame-retardant layers (6), and the high-temperature flame-retardant layers (6) are fixedly connected to the interior filling layer (7).

5. A medium-voltage power cable with water-blocking function according to claim 4, characterized in that: The inner filling layer (7) has an inner blocking layer (5) which is fixedly connected to the inner filling layer (7).

6. A medium-voltage power cable with water-blocking function according to claim 5, characterized in that: The blocking layer (5) has an internal insulating layer (4) inside, and the internal insulating layer (4) is fixedly connected to the blocking layer (5).

7. A medium-voltage power cable with water-blocking function according to claim 6, characterized in that: The inner insulating layer (4) is provided with a conductive inner core (3), and the conductive inner core (3) is fixedly connected to the inner insulating layer (4).

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