High-voltage shielding cable

Abstract

The utility model relates to the technical field of power transmission, in particular to a high-voltage shielding cable which comprises an outer coating layer, a braid layer, a polyester belt, an insulating layer, a conductor and a filling assembly, the outer coating layer, the braid layer and the polyester belt form a multi-layer coating structure, and the outer coating layer, the braid layer and the polyester belt are sequentially arranged from outside to inside. The polyester tape wraps the outer surface of the insulating layer in a spiral winding manner; at least three conductors are uniformly distributed in the insulating layer in the circumferential direction; through the arrangement of the supporting inner core, the supporting plate, the elastic sleeve and other components, the supporting plate can form uniform radial supporting force on the elastic sleeve through rigid supporting of the supporting inner core by means of the interference fit connection relation between the tail ends of the four extending arms of the cross-shaped section of the supporting inner core and the supporting plate. The gap between the inner wall of the elastic sleeve and the outer surface of the supporting plate forms an annular cavity, stress can be absorbed through elastic deformation when the cable is extruded by external force, and the central axis is prevented from deviating.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, and in particular to a high-voltage shielded cable. Background Technology

[0002] In the field of high-voltage power transmission, cable performance is crucial. With increasing electricity demand, high-voltage cables need to adapt to more complex operating conditions. Traditional cable filling structures have many shortcomings, such as unstable central support, making the cable prone to deformation under external pressure or bending, leading to internal conductor displacement and insulation damage, affecting transmission safety and stability. Furthermore, existing filling components offer only basic conductor protection, making it difficult to cope with vibration and friction, accelerating conductor wear and shortening cable lifespan. Meanwhile, with increasing demands for miniaturization and lightweight cables, achieving efficient support and protection within limited space has become an urgent problem to solve.

[0003] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: existing cables lack effective internal support structures, or the support structure design is unreasonable, causing the cables to easily deform when subjected to external pressure or tension, affecting their performance and service life. Without buffering designs such as elastic sleeves and hollow buffer strips, the cable's ability to absorb external impacts is weak, and internal components such as conductors and insulation layers are easily damaged when subjected to vibration or collision, reducing the cable's reliability. Utility Model Content

[0004] To address the problems mentioned in the background section, this application provides a high-voltage shielded cable.

[0005] This application provides a high-voltage shielded cable, which adopts the following technical solution: A high-voltage shielded cable includes an outer sheath, a braided layer, a polyester tape, an insulation layer, a conductor, and a filling component. The outer sheath, braided layer, and polyester tape constitute a multi-layer covering structure, which consists of an outer sheath, a braided layer, and a polyester tape from the outside to the inside. The polyester tape is wrapped around the outer surface of the insulation layer in a spiral winding manner. At least three conductors are evenly distributed circumferentially inside the insulation layer.

[0006] The filling assembly is located at the central axis of the cable and consists of a supporting inner core, a supporting plate, and an elastic sleeve arranged sequentially from the inside out. The supporting inner core has a cross-shaped cross-section structure, and its four extended arms are respectively connected to the supporting plate.

[0007] The above scheme achieves a balance between axial stress dispersion and radial support, significantly enhancing structural stability.

[0008] Optionally, the four extended arms of the cross-shaped cross section of the supporting core are provided with arc-shaped grooves, and the supporting plate is embedded in the arc-shaped grooves by interference fit. The inner wall of the elastic sleeve and the outer surface of the supporting plate maintain a gap of 0.5-2mm to form an annular cavity.

[0009] The above solution ensures the reliability of mechanical connections while providing dynamic buffer space.

[0010] Optionally, the filling assembly further includes a partition and a hollow buffer strip disposed on the outer periphery of the elastic sleeve. The partition extends radially and contacts the inner wall of the insulation layer, and the hollow buffer strip has a tubular structure and is evenly distributed circumferentially between the partition and the elastic sleeve.

[0011] The above scheme constructs a multi-level buffer system to effectively absorb mechanical stress from different directions.

[0012] Optionally, the hollow buffer strip is filled with silicone damping material, the wall thickness of which gradually decreases from the side near the elastic sleeve to the side of the partition, and the spacing between adjacent hollow buffer strips is smaller than the diameter of the conductor.

[0013] The above scheme achieves gradient damping and prevents conductor displacement.

[0014] Optionally, the conductor surface is provided with a color identification layer, with different colors corresponding to conductor materials with different conductivity properties, and the conductor cross-section has an elliptical structure with its major axis pointing towards the central axis of the cable.

[0015] The above solution optimizes current distribution efficiency while improving installation visibility.

[0016] Optionally, the braided layer is made of tin-plated copper wire and aramid fiber in a 3:1 ratio, with a braiding angle of 45-60 degrees, and the wrapping overlap rate of the polyester tape is not less than 30%.

[0017] The above solution balances electromagnetic shielding strength with mechanical flexibility.

[0018] Optionally, the supporting core is made of polyimide composite material with a cross-shaped cross section having an aspect ratio of 1:0.6-0.8, and the elastic sleeve has a three-layer composite structure, consisting of a silicone rubber layer, a glass fiber braided layer, and a fluoroplastic layer from the inside out.

[0019] The above solution maintains excellent structural strength and deformation recovery capability under high-temperature conditions.

[0020] In summary, this application includes the following beneficial technical effects:

[0021] 1. This utility model, by setting up components such as a supporting inner core, a supporting plate, and an elastic sleeve, achieves uniform radial support force on the elastic sleeve through the interference fit between the four extended arms of the cross-shaped cross section of the supporting inner core and the supporting plate. The gap between the inner wall of the elastic sleeve and the outer surface of the supporting plate forms an annular cavity, which can absorb stress through elastic deformation when the cable is subjected to external force, preventing the central axis from shifting. Thus, this device achieves the effect of providing stable support to the central region of the cable through the structural cooperation between the supporting inner core and the supporting plate, and reducing the impact of external mechanical stress on the internal conductor by utilizing the buffering effect of the elastic sleeve, ensuring the structural stability of the cable under complex working conditions.

[0022] 2. This utility model, through the arrangement of components such as partitions, hollow buffer strips, and elastic sleeves, achieves a dynamic buffering protection effect on the conductors circumferentially distributed within the insulation layer. The partitions extend radially and maintain close contact with the inner wall of the insulation layer. The hollow buffer strips are evenly distributed between the partitions and elastic sleeves, allowing them to provide a surrounding buffer protection for the conductors through the positioning effect of the partitions. The silicone damping material filled inside the hollow buffer strips absorbs vibration energy. The design of the tube wall thickness gradually decreasing from the inside to the outside allows it to adapt to conductor displacement through gradient deformation when the cable bends, preventing wear caused by excessive compression. Simultaneously, the design of the spacing between adjacent hollow buffer strips being smaller than the conductor diameter effectively limits the radial movement range of the conductor. Thus, this device achieves the effect of dynamically buffering and protecting the internal conductors of high-voltage cables through the synergistic action of the partitions and hollow buffer strips, improving the cable's bending and vibration resistance, and extending the conductor's service life. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application;

[0024] Figure 2 This is a partial structural diagram of an embodiment of this application;

[0025] Figure 3 This is a partial structural diagram of the filling component in an embodiment of this application;

[0026] Reference numerals: 1. Outer sheath; 2. Braided layer; 3. Polyester tape; 4. Insulation layer; 5. Conductor; 6. Filler assembly; 601. Supporting inner core; 602. Support plate; 603. Elastic sleeve; 604. Partition; 605. Hollow buffer strip. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0028] This application discloses a high-voltage shielded cable.

[0029] Please see Figure 1 A high-voltage shielded cable includes an outer sheath 1, a braided layer 2, a polyester tape 3, an insulation layer 4, a conductor 5, and a filler assembly 6. The outer sheath 1, the braided layer 2, and the polyester tape 3 form a multi-layered covering structure, with the outer sheath 1, the braided layer 2, and the polyester tape 3 arranged sequentially from the outside to the inside. The polyester tape 3 is wrapped around the outer surface of the insulation layer 4 in a spiral winding manner. At least three conductors 5 are evenly distributed circumferentially inside the insulation layer 4.

[0030] The surface of conductor 5 is provided with a color identification layer. Different colors correspond to conductor materials with different conductivity properties. The cross-section of conductor 5 is an elliptical structure, and its major axis points to the central axis of the cable.

[0031] The braided layer 2 is made of tin-plated copper wire and aramid fiber in a 3:1 ratio, with a braiding angle of 45-60 degrees, and the wrapping overlap rate of the polyester tape 3 is not less than 30%.

[0032] Please see Figures 2 to 3 The filling component 6 is located at the central axis of the cable and consists of a supporting inner core 601, a supporting plate 602, and an elastic sleeve 603 arranged sequentially from the inside to the outside. The supporting inner core 601 has a cross-shaped cross-section structure, and its four extension arms are respectively connected to the supporting plate 602.

[0033] The four extended arms of the cross-shaped cross section of the supporting inner core 601 are provided with arc-shaped grooves. The supporting plate 602 is embedded in the arc-shaped grooves by interference fit. The inner wall of the elastic sleeve 603 and the outer surface of the supporting plate 602 maintain a gap of 0.5-2mm to form an annular cavity.

[0034] The filling component 6 also includes a partition 604 and a hollow buffer strip 605 disposed on the outer periphery of the elastic sleeve 603. The partition 604 extends radially and contacts the inner wall of the insulating layer 4. The hollow buffer strip 605 has a tubular structure and is evenly distributed circumferentially between the partition 604 and the elastic sleeve 603.

[0035] The hollow buffer strip 605 is filled with silicone damping material. Its wall thickness gradually decreases from the side near the elastic sleeve 603 to the side of the partition 604, and the distance between adjacent hollow buffer strips 605 is less than the diameter of the conductor 5.

[0036] The supporting core 601 is made of polyimide composite material, and its cross-shaped cross section has an aspect ratio of 1:0.6-0.8. The elastic sleeve 603 has a three-layer composite structure, consisting of a silicone rubber layer, a glass fiber braided layer, and a fluoroplastic layer from the inside out.

[0037] Further explanation is needed: The filling component 6, as the core support and buffer structure of the high-voltage shielded cable, primarily achieves two core functions through the coordinated operation of multiple layers of components: stabilizing the cable's central axis structure; the supporting core 601 is made of cross-shaped polyimide composite material, and its four extension arms are interference-fitted with the support plate 602 through arc-shaped grooves to form a rigid support skeleton, uniformly supporting the outer elastic sleeve 603. A 0.5-2mm gap is left between the inner wall of the elastic sleeve 603 and the outer surface of the support plate 602. The annular cavity absorbs radial stress through elastic deformation when the cable is subjected to external force compression or bending, preventing the central axis from shifting and ensuring the geometric stability of the overall cable structure. It provides a reliable internal support foundation for the insulation layer 4 and conductor 5, dynamically protecting the internal conductor 5. The partition 604 extends radially and contacts the inner wall of the insulation layer 4. Hollow buffer strips 605 are evenly distributed between the partition 604 and the elastic sleeve 603. The hollow buffer strips 605 adopt a gradient wall thickness design and are filled with silicone damping material, which can effectively absorb vibration energy. When the cable bends, they adapt to the displacement of conductor 5 through gradient deformation, reducing friction and wear between conductor 5 and insulation layer 4. The design of the spacing between adjacent buffer strips being smaller than the diameter of conductor 5 further limits the radial movement range of conductor 5. Combined with the buffering effect of elastic sleeve 603, it forms a surrounding protection for the circumferentially distributed conductor 5, improving the cable's bending and vibration resistance, ensuring the electrical performance stability of conductor 5 during high-voltage power transmission, and extending the cable's service life.

[0038] The implementation principle of a high-voltage shielded cable in this application embodiment is as follows:

[0039] First, the inner support core (601) serves as the structural core. It is made of polyimide composite material with a cross-shaped cross section. Its high strength characteristics form a rigid support skeleton. The arc-shaped grooves at the ends of the four extension arms are interference-fitted with the support plate (602). The support plate 602 is precisely positioned in the four directions of the cable's central axis, thus constructing a stable cross-shaped support structure. This provides an installation reference for the peripheral components and ensures the geometric symmetry of the entire filling assembly 6.

[0040] Secondly, the elastic sleeve (603) is fitted on the outside of the support plate 602, and the inner wall maintains a gap of 0.5-2mm with the outer surface of the support plate 602 to form an annular cavity. When the cable is subjected to external radial compression or bending, the elastic sleeve 603 absorbs stress through its own elastic deformation. The compressibility of the cavity allows the sleeve to shrink slightly towards the center when under force, avoiding stress being directly transmitted to the inner conductor 5. At the same time, the composite characteristics of the glass fiber braided layer and the fluoroplastic layer maintain the shape stability during the buffering process.

[0041] Next, the partition (604) extends radially and comes into close contact with the inner wall of the insulation layer (4). As the connection hub between the conductor 5 area and the central support structure, its circumferentially distributed design divides the space inside the insulation layer 4 into multiple independent areas, ensuring that the circumferentially distributed conductor (5) is accurately limited to the preset position, avoiding axial displacement of the conductor 5 during cable forming or use, and providing a positioning basis for subsequent buffer protection.

[0042] Next, a hollow buffer strip (605) is installed between the partition 604 and the elastic sleeve 603. It is a tubular structure with a uniform circumferential distribution. The silicone damping material filled inside can absorb the energy generated by cable vibration. The design of the tube wall thickness gradually decreasing from the elastic sleeve 603 side to the partition 604 side causes the buffer strip to produce gradient deformation when the cable bends. The inner side near the center is more rigid and maintains basic support. The thinner outer part adapts to the displacement of the conductor 5 and reduces the friction between the conductor 5 and the insulation layer 4. The distance between adjacent buffer strips is less than the diameter of the conductor 5, further limiting the radial movement range of the conductor 5 and forming a surrounding protective barrier.

[0043] Finally, the rigid skeleton supporting the inner core 601, the dynamic buffer of the elastic sleeve 603, the area division of the partition 604, and the gradient protection of the buffer strip together constitute a multi-level collaborative system: the rigid structure ensures the stability of the central axis, the elastic layer absorbs external mechanical stress, and the buffer strip reduces wear on the internal conductor 5. Ultimately, during high-voltage power transmission, it not only ensures that the overall cable structure is resistant to compression and bending, but also maintains its electrical performance stability by reducing physical damage to the conductor 5, thus achieving full-process functional coverage of "support-buffering-protection".

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-voltage shielded cable, comprising an outer sheath (1), a braided layer (2), a polyester tape (3), an insulation layer (4), a conductor (5), and a filling assembly (6), characterized in that: The outer sheath (1), the braided layer (2) and the polyester tape (3) constitute a multi-layer covering structure, which consists of the outer sheath (1), the braided layer (2) and the polyester tape (3) from the outside to the inside. The polyester tape (3) is wrapped around the outer surface of the insulation layer (4) in a spiral winding manner. The insulating layer (4) has at least three conductors (5) evenly distributed in the inner circumference. The filling component (6) is located at the center axis of the cable and is provided with a supporting inner core (601), a supporting plate (602) and an elastic sleeve (603) from the inside to the outside. The supporting inner core (601) has a cross-shaped cross-section structure, and its four extended arms are respectively connected to the supporting plate (602).

2. A high-voltage shielded cable according to claim 1, characterized in that: The four extended arms of the cross-shaped cross section of the supporting inner core (601) are provided with arc-shaped grooves. The supporting plate (602) is embedded in the arc-shaped groove by interference fit. The inner wall of the elastic sleeve (603) and the outer surface of the supporting plate (602) maintain a gap of 0.5-2mm to form an annular cavity.

3. A high-voltage shielded cable according to claim 2, characterized in that: The filling component (6) further includes a partition (604) and a hollow buffer strip (605) disposed on the outer periphery of the elastic sleeve (603). The partition (604) extends radially and contacts the inner wall of the insulating layer (4). The hollow buffer strip (605) has a tubular structure and is evenly distributed circumferentially between the partition (604) and the elastic sleeve (603).

4. A high-voltage shielded cable according to claim 3, characterized in that: The hollow buffer strip (605) is filled with silicone damping material. Its wall thickness gradually decreases from the side near the elastic sleeve (603) to the side of the partition (604), and the distance between adjacent hollow buffer strips (605) is less than the diameter of the conductor (5).

5. A high-voltage shielded cable according to claim 1, characterized in that: The conductor (5) has a color identification layer on its surface. Different colors correspond to conductor materials with different conductivity. The cross-section of the conductor (5) is an elliptical structure, and its long axis points to the central axis of the cable.

6. A high-voltage shielded cable according to claim 1, characterized in that: The braided layer (2) is made of tin-plated copper wire and aramid fiber in a ratio of 3:1, with a braiding angle of 45-60 degrees, and the winding overlap rate of the polyester tape (3) is not less than 30%.

7. A high-voltage shielded cable according to claim 1, characterized in that: The supporting inner core (601) is made of polyimide composite material, and its cross-shaped cross section has an aspect ratio of 1:0.6-0.

8. The elastic sleeve (603) is a three-layer composite structure, consisting of a silicone rubber layer, a glass fiber braided layer and a fluoroplastic layer from the inside out.

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