Long-life cable with self-repairing insulation

Abstract

This invention relates to the field of power cable technology, specifically disclosing a long-life cable with a self-healing insulation layer. The cable comprises, from the inside out, a center conductor, an inner support layer, an insulation layer, and an outer protective layer. The insulation layer includes insulating sheets, coiled springs, and axial springs. The insulating sheets are divided into multiple groups along the length of the inner support layer, with each group circumferentially distributed. An axial spring is provided between adjacent groups of insulating sheets, and a coiled spring is fitted within a circumferential groove on the outer edge of adjacent insulating sheets within the same group. The axial protrusion on the inner edge of the insulating sheet forms a guiding fit with the axial groove on the outer edge of the inner support layer. This invention provides radial elastic constraint through the coiled springs to absorb thermal expansion and contraction stress, and buffers axial tensile and compressive loads through the axial springs. The synergistic effect of these two mechanisms actively inhibits the generation and propagation of microcracks and interlayer delamination, significantly extending the cable's service life under complex and harsh conditions in fields such as wind power, photovoltaics, energy storage, and new energy vehicles, thus possessing the outstanding advantages of both high reliability and long lifespan.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and more specifically, to a long-life cable with a self-healing insulation layer. Background Technology

[0002] The rapid development of the new energy industry has placed increasingly stringent performance requirements on power cables. In applications such as wind power, photovoltaic, energy storage power stations, and high-voltage power distribution for new energy vehicles, cables are subjected to complex and harsh environments: outdoor photovoltaic and wind power cables must withstand sudden changes in temperature (-40℃ to 125℃), ultraviolet radiation, wind and rain erosion, and mechanical vibration; while cables on new energy vehicles and internal cables in energy storage cabinets are frequently subjected to bending, stretching, and vibration along with the equipment. These complex operating conditions easily lead to structural damage to the cable insulation layer, such as micro-cracks, surface cracking, gap expansion, and localized peeling, which can then cause insulation failure, leakage, or even short-circuit faults. This severely restricts the stable and long-term operation of new energy power systems and significantly increases cable replacement and maintenance costs.

[0003] Currently, existing technologies for repairing cable insulation damage mainly rely on two categories of solutions. The first category is self-healing material technology, but this solution has limited repair capacity. Once the repair agent in the microcapsules is depleted, the material loses its repair ability and cannot cope with multiple damages that may occur during the service life. At the same time, the addition of a large amount of functional fillers may sacrifice the intrinsic electrical properties and long-term weather resistance of the insulation material. The second category is structural thickening technology, but this solution fails to fundamentally solve the mechanism of damage generation and propagation. Instead, it leads to an increase in cable outer diameter and weight, which is not conducive to the requirement of lightweighting and significantly increases costs.

[0004] Therefore, there is an urgent need for a new type of cable with repair capabilities. Summary of the Invention

[0005] This invention proposes a long-life cable with a self-healing insulation layer, which solves the problem that cables used in complex and harsh environments need to be able to repair their own insulation layer at low cost, thereby increasing the service life of the cable in complex and harsh environments.

[0006] The technical solution of the present invention is as follows:

[0007] A long-life cable with a self-healing insulation layer includes, from the inside out, a center conductor, an inner support layer, an insulation layer, and an outer protective layer. The center conductor is conductive. The inner support layer is sleeved outside the center conductor. The insulation layer is sleeved outside the inner support layer. The outer protective layer is sleeved outside the insulation layer. The insulation layer includes insulating sheets, coil springs, and axial springs. Along the length of the inner support layer, the insulating sheets are divided into multiple groups. The axial springs are disposed between the insulating sheets of adjacent layers. Multiple insulating sheets are arranged in a circumferentially around the inner support layer. Adjacent insulating sheets within the same group maintain contact with each other. The insulating sheets have… The insulating sheet has an outer edge and an inner edge. The inner edge of the insulating sheet contacts the inner support layer, and the outer edge of the insulating sheet contacts the outer protective layer. An axial protrusion is provided on the inner edge of the insulating sheet, and an axial groove is provided on the outer edge of the inner support layer. The axial protrusion passes through the axial groove. A circumferential groove is provided on the outer edge of the insulating sheet. The circumferential grooves of adjacent insulating sheets in the same group are aligned with each other. A coil spring is sleeved in the circumferential groove. An axial guide hole is provided on the end face of the insulating sheet. The axial spring passes through the axial guide hole of the insulating sheet in the adjacent group. There is a gap between the insulating sheets in the adjacent groups. The inner support layer, the insulating layer, and the outer protective layer are all non-conductive.

[0008] Through the above technical solution, the insulating sheets are divided into multiple groups along the length of the inner support layer, and each group is circumferentially distributed. An axial spring is installed between adjacent groups of insulating sheets. This structure allows the axial springs to adaptively absorb and buffer axial deformation energy when the cable is subjected to axial tension, compression, or bending, preventing hard compression or excessive separation between adjacent insulating sheets. Simultaneously, coil springs are fitted into the circumferential grooves of the insulating sheets within the same group. When the cable undergoes radial deformation due to thermal expansion and contraction or external compression, the coil springs provide radial elastic constraint force. This allows for slight radial displacement of the insulating sheets to release stress while ensuring that the insulating sheets within the same group always maintain tight contact, preventing insulation gaps. The axial protrusions and axial grooves work together to guide and limit the insulating sheets, ensuring that each insulating sheet slides along a predetermined axial direction during long-term service without circumferential misalignment or torsion. The synergistic effect of the aforementioned radial and axial dual elastic constraint mechanism and guiding and limiting mechanism enables the cable to actively absorb thermo-mechanical coupling stress, automatically compensate for structural gaps, and maintain the integrity and alignment of the insulation layer under complex and harsh working conditions. This fundamentally inhibits structural damage such as microcrack initiation, gap propagation, and interlayer peeling, significantly extending the service life of the cable and ensuring electrical safety.

[0009] Preferably, one insulating sheet corresponds to one axial protrusion, the axial protrusion is located at the middle position of the inner edge of the insulating sheet, and the number of axial protrusions is the same as the number of axial grooves and they are arranged in a one-to-one correspondence.

[0010] The above technical solution reduces the types of parts and the difficulty of mold processing while ensuring reliable guidance and limiting functions, thus lowering manufacturing costs. At the same time, it ensures that each insulating sheet slides independently and smoothly, avoiding jamming or uneven force caused by redundant matching, thereby improving structural stability.

[0011] Preferably, the length direction of the axial groove is consistent with the length direction of the inner support layer, and the axial groove extends to both ends of the inner support layer, while the axial protrusion extends to both ends of the insulating sheet.

[0012] The above technical solution simplifies the assembly process, improves production efficiency, increases the contact length of the guide mating surface, prevents the insulation sheet from sliding off-center, ensures accurate alignment of the axial guide holes of adjacent sets of insulation sheets, and guarantees the smooth installation and long-term stable operation of the axial spring.

[0013] Preferably, one insulating sheet corresponds to two circumferential grooves, the two circumferential grooves are symmetrically distributed with respect to the center of the insulating sheet, and the same group of insulating sheets corresponds to two coil springs.

[0014] The above technical solution makes the radial clamping force on the same group of insulation sheets more uniform and balanced, effectively resists the cross-sectional deformation when the cable is bent, ensures that the insulation sheets always maintain close contact under frequent bending conditions, and enhances the structural integrity and sealing of the insulation layer.

[0015] Preferably, one insulating sheet corresponds to two axial guide holes, and the two axial guide holes are symmetrically arranged at the middle position of the two end faces of the insulating sheet.

[0016] The above technical solution reduces the directional requirements of assembly, simplifies the installation operation, minimizes the weakening of the strength of the insulating sheet body, ensures that the axial spring force is evenly transmitted to the central area, prevents the insulating sheet from tilting and jamming, and improves the reliability of axial buffering.

[0017] Preferably, the central conductor is cylindrical, and both the inner support layer and the outer protective layer are cylindrical.

[0018] The above technical solution enables the cable to have a regular cylindrical structure, which facilitates large-scale production using mature processes and reduces manufacturing costs. At the same time, the cylindrical structure distributes stress evenly, avoids local stress concentration, and improves mechanical strength.

[0019] Preferably, the diameter of the center conductor is one-third to one-half the diameter of the long-life cable, the thickness of the inner support layer is the same as the thickness of the insulating sheet, and the thickness of the outer protective layer is one-third to one-half the thickness of the inner support layer.

[0020] Through the above technical solution, the thickness ratio of each layer is optimized and limited. Under this ratio, it can ensure sufficient current-carrying area of ​​the central conductor, ensure uniform support of the inner support layer, and at the same time, the outer protective layer adopts a thinner thickness while ensuring weather resistance, thus achieving the optimal balance between electrical performance, mechanical strength and lightweight miniaturization.

[0021] Preferably, the axial length of the insulating sheet is 200mm-800mm.

[0022] The above technical solution effectively balances the structural integrity of the insulation layer, the bending flexibility of the cable, and the economy of manufacturing and assembly, and has wide applicability.

[0023] Preferably, the number of insulating sheets in the same group is 4-8.

[0024] The above technical solution ensures that the insulating sheets can be bonded together with a small arc length to form a complete ring, thus ensuring the uniformity and sealing of the insulation layer. It also controls the number of parts to balance manufacturing costs and assembly efficiency, while each insulating sheet has sufficient structural strength to resist mechanical stress during use.

[0025] Preferably, the central conductor is made of copper, the inner support layer is made of silicone, the insulating sheet is made of polyolefin, and the outer protective layer is made of high-density polyethylene.

[0026] Through the above technical solution, the center conductor uses copper to ensure excellent conductivity; the inner support layer uses silicone to provide elastic buffering and padding protection; the insulation sheet uses polyolefin to ensure stable insulation performance over a wide temperature range; and the outer protective layer uses high-density polyethylene to resist external mechanical and environmental corrosion. These four elements work together to achieve optimal performance matching in conductivity, support, insulation, and protection, ensuring the long-term stable operation of the cable.

[0027] The beneficial effects of the long-life cable with a self-healing insulation layer provided by this invention are as follows:

[0028] I. Through a dual elastic constraint mechanism of coil springs and axial springs, this invention utilizes the radial contraction force of the coil springs to absorb the deformation stress generated by thermal expansion and contraction in the radial direction of the cable, ensuring that the insulating sheets in the same group always maintain close contact without gaps; in the axial direction, the expansion and contraction deformation of the axial springs buffers the impact loads caused by tension, compression, and bending, preventing hard compression or excessive separation between adjacent insulating sheets. The synergistic effect of radial and axial forces actively inhibits the initiation of microcracks in the insulation layer and the propagation of interlayer peeling from the root, significantly extending the service life of the cable under alternating load conditions.

[0029] Second, the precise guiding fit between the axial protrusions and axial grooves ensures that each insulating sheet slides along a predetermined axial trajectory without circumferential skew or misalignment. This guarantees that multiple sets of insulating sheets maintain axial alignment throughout long-term service, ensuring good structural alignment of the entire insulation layer. The uniform insulation structure helps maintain a uniform distribution of the electric field within the cable, effectively avoiding the risk of partial discharge caused by electric field distortion. From an electrical performance perspective, this further enhances the cable's operational safety and long-term reliability under high-voltage conditions.

[0030] Third, the discrete insulation sheet assembly structure replaces the traditional continuous integral insulation layer, confining structural damage caused by external impact or thermal stress to a single insulation sheet, preventing it from spreading continuously between layers. Simultaneously, the coil springs and axial springs can adaptively compensate for the resulting gaps according to the positional changes of the insulation sheets, ensuring that the insulation layer maintains overall structural integrity and reliable electrical insulation even after localized damage. This dual mechanism of "damage isolation + adaptive compensation" endows the cable with true structural self-healing capability.

[0031] Fourth, the symmetrical arrangement of double coiled springs and double-axis guide holes ensures that the radial clamping force on the insulation sheets in the same group is evenly distributed in the circumferential direction, and the axial spring force is transmitted centrally along the central axis of the insulation sheet. This effectively avoids problems such as insulation sheet tilting, jamming, or uneven wear caused by unilateral constraint or eccentric force. This balanced force design significantly improves the structural stability and interlayer sealing reliability of the cable under harsh dynamic conditions such as frequent bending, severe vibration, and repeated torsion.

[0032] V. Through comprehensive and coordinated optimization of the material and size ratios of each layer, the central conductor, made of copper, ensures excellent current-carrying capacity; the silicone inner support layer provides flexible buffering and protection to prevent wear caused by direct contact between the insulation sheet and the conductor; the polyolefin insulation sheet maintains stable dielectric properties over a wide temperature range to ensure insulation reliability; and the high-density polyethylene outer protective layer effectively resists external mechanical wear, ultraviolet radiation, and chemical corrosion. These four elements achieve optimal performance matching in terms of conductivity, support, insulation, and protection, fully meeting the long-life usage requirements under complex and harsh operating conditions in the new energy field. Attached Figure Description

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] Figure 1 This invention provides a structural schematic diagram of a long-life cable with a self-healing insulation layer;

[0035] Figure 2 for Figure 1 Partial schematic diagram;

[0036] Figure 3 for Figure 1 Front view;

[0037] Figure 4 for Figure 3 Sectional view at point AA;

[0038] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0039] Figure 6 for Figure 1 A partial schematic diagram showing the area behind the concealed protective outer layer;

[0040] Figure 7 for Figure 6 A schematic diagram showing the insulation layer partially concealed;

[0041] Figure 8 A schematic diagram of the structure formed by the combination of a single set of insulating sheets and an inner support layer provided in this application;

[0042] Figure 9 This is a schematic diagram of the structure of the insulating sheet provided in this application;

[0043] Figure 10 for Figure 9 A schematic diagram of the structure after rotating by an angle;

[0044] Figure 11 This is a schematic diagram of the coil spring provided in this application.

[0045] In the diagram: 1. Center conductor; 2. Inner support layer; 3. Insulation layer; 4. Outer protective layer; 5. Insulation sheet; 6. Coil spring; 7. Axial spring; 8. Axial protrusion; 9. Axial groove; 10. Axial guide hole; 11. Circumferential groove. Detailed Implementation

[0046] 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.

[0047] refer to Figures 1 to 11 The present invention provides a long-life cable with a self-healing insulation layer.

[0048] refer to Figures 1 to 4 A long-life cable with a self-healing insulation layer includes a center conductor 1, an inner support layer 2, an insulation layer 3, and an outer protective layer 4. The center conductor 1 is located at the innermost layer of the long-life cable and is used to transmit current. The inner support layer 2 is fitted over the center conductor 1 and supports the insulation layer 3, while also isolating the center conductor 1 and the insulation layer 3. The insulation layer 3 is used to prevent leakage in the long-life cable. The outer protective layer 4 is used to resist external physical damage such as friction and cutting, and also isolates the cable from harsh environments. The center conductor 1 is conductive, but the inner support layer 2, insulation layer 3, and outer protective layer 4 are non-conductive.

[0049] refer to Figures 4 to 11 The insulation layer 3 includes insulating sheets 5, coil springs 6, and axial springs 7. There are multiple insulating sheets 5 arranged in multiple groups, with each group containing multiple insulating sheets 5. The insulating sheets 5 within the same group are circumferentially distributed. The insulating sheets 5 in adjacent groups are distributed along the length of the inner support layer 2, and there are gaps between corresponding insulating sheets 5 in adjacent groups. The axial springs 7 are located between corresponding insulating sheets 5 in adjacent groups and are used to absorb and buffer the axial forces, tension, and compression of the cable, thereby preventing excessive compression between the insulating sheets 5 in adjacent groups. Furthermore, the forces on the inner support layer 2 and the outer protective layer 4 can be transferred to the insulating sheets 5, thereby reducing the tension and compression of the inner support layer 2 and the outer protective layer 4 along their own axes, ultimately improving the overall service life of the cable.

[0050] Furthermore, to facilitate the installation and fixing of the axial spring 7, and to ensure that the axial spring 7 does not bend during deformation, thus preventing the axis of the axial spring from deviating from the axial direction of the cable, an axial guide hole 10 is provided on the end face of the insulating sheet 5, as shown in the reference. Figure 4 and Figure 8 Along the cable axis, the axial guide holes 10 on adjacent insulating sheets 5 are correspondingly provided, and both ends of the axial spring 7 are inserted into the axial guide holes 10.

[0051] refer to Figure 1The insulating sheet 5 has an inner edge and an outer edge. The inner edge of the insulating sheet 5 contacts the inner support layer 2, and the outer edge of the insulating sheet 5 contacts the outer protective layer 4. Insulating sheets 5 in the same group contact each other to form a complete "insulating sleeve," which is fitted over the inner support layer 2 and passes through the outer protective layer 4. To facilitate installation and allow the insulating sheet 5 to move along the cable axial direction, an axial groove 9 is provided on the outer edge of the inner support layer 2, and an axial protrusion 8 is provided on the inner edge of the insulating sheet 5, which can be inserted into the axial groove 9. A circumferential groove 11 is provided on the outer edge of the insulating sheet 5. When adjacent insulating sheets 5 contact, the circumferential groove 11 is interconnected, forming a ring-shaped "total axial groove 9" on the outer edge of the "insulating sleeve." The coil spring 6 is fitted within this "total axial groove 9." When the cable is subjected to thermal expansion and contraction, the coil spring 6 deforms, absorbing the deformation energy of the inner support layer 2 in the radial direction of the cable, reducing deformation, and improving the cable's service life.

[0052] This invention reduces the relative movement and twisting between the layers inside the cable by combining the combination of the coil spring 6 and the insulating sheet 5 to reduce the deformation in the radial direction of the cable and the axial spring 7 between adjacent insulating sheets 5 in the axial direction of the cable. This reduces the service life of the cable in harsh environments.

[0053] refer to Figures 6 to 7 To facilitate manufacturing, reduce manufacturing costs, and allow for a certain amount of deformation in long-life cables to reduce external impact, each insulating sheet 5 corresponds to an axial protrusion 8, and the axial protrusion 8 extends along the axial direction of the insulating sheet 5 from one end face to the other. Simultaneously, during the fabrication of the inner support layer 2, axial grooves 9 on the outer edge of the inner support layer 2 need to be formed during injection molding. The axial grooves 9 are along the axial direction of the inner support layer 2, and each axial groove 9 corresponds to an axial protrusion 8 (in the case of insulating sheets 5 in the same layer), that is, each axial groove 9 corresponds to one insulating sheet 5.

[0054] When the same axial groove 9 corresponds to multiple insulating sheets 5 along the axial direction of the cable (in the case of insulating sheets 5 in adjacent layers), since the axial positions between adjacent insulating sheets 5 are relatively fixed, the axial guide holes 10 on the end face of the insulating sheet 5 can be aligned, thereby ensuring the smooth installation of the axial spring 7.

[0055] During installation, along the length of the axial groove 9, the first insulating sheet 5 is placed first, then the axial spring 7 is placed into the axial guide hole 10, and then the second insulating sheet 5 is placed. The first and second insulating sheets 5 are located within adjacent groups of insulating sheets 5. During overall installation, the center conductor 1 is first extruded and wrapped to form an inner support layer 2 with the axial groove 9 on its surface. Then, insulating sheets 5 of the same layer are installed on the inner support layer 2. After the insulating sheets 5 of the same group are placed, the coil spring 6 is fitted. Then, adjacent groups of insulating sheets 5 are installed sequentially along the direction of the inner support layer 2. After installation, the entire assembly is extruded and wrapped to form an outer protective layer 4.

[0056] refer to Figures 6 to 8 To facilitate the installation of the coil springs 6 and ensure that each insulating sheet 5 receives adequate clamping force to cope with the radial deformation of long-life cables, two circumferential grooves 11 are provided on the outer edge of the insulating sheet 5. Each circumferential groove 11 corresponds to one coil spring 6. That is, for the "insulating sleeve" formed by the insulating sheets 5 in the same group, one "insulating sleeve" corresponds to two coil springs 6. The two coil springs 6 are set at a certain distance, which is half the axial length of the insulating sheet 5.

[0057] Since adjacent insulating sheets 5 all require axial guide holes 10, axial guide holes 10 are opened on both end faces of the insulating sheet 5, and the axial guide holes 10 are opened at the middle position of the cross section of the insulating sheet 5, so as to minimize the weakening of the strength of the insulating sheet 5.

[0058] refer to Figures 1 to 4 To facilitate manufacturing and meet industry standards, the center conductor 1 is cylindrical, and the inner support layer 2 and the outer protective layer 4 are both cylindrical, thus making the long-life cable appear cylindrical as a whole.

[0059] To suit the environment, the diameter of the center conductor 1 is set to one-third to one-half of the cable diameter. At the same time, the thickness of the inner support layer 2 and the thickness of the insulation sheet 5 are set to be the same, and the thickness of the outer protective layer 4 is set to one-third to one-half of the thickness of the inner support layer 2.

[0060] In a practical application, the diameter of a long-life cable is typically set to 40mm-60mm, the diameter of the center conductor 1 is typically 12mm-30mm, the thickness of the inner support layer 2 and the insulation sheet 5 is typically 5mm-8mm, and the thickness of the outer protective layer 4 is typically 2mm-4mm.

[0061] This invention also provides a method for producing a long-life cable, applicable to the production of a long-life cable with a self-healing insulation layer, comprising the following steps:

[0062] Step 1: Preparation of the center conductor: Select copper material and process it into a cylindrical center conductor of a predetermined diameter through a wire drawing process. Clean the surface of the center conductor to remove oil and oxide layers to obtain a clean conductive substrate.

[0063] Step 2: Forming the inner support layer: Using an extrusion coating process, a layer of silicone material is uniformly coated on the outer surface of the central conductor to form a cylindrical inner support layer. During the extrusion molding process, multiple axial grooves extending along the length direction are simultaneously formed on the outer edge of the inner support layer through a mold. The axial grooves penetrate both ends of the inner support layer, and each axial groove is evenly distributed along the circumference of the inner support layer. The number of these grooves matches the number of insulating sheets to be installed.

[0064] Step 3: Preparation of insulating sheets: Using injection molding technology, polyolefin is used as raw material to form arc-shaped sheet insulating sheets with predetermined arc length and axial length; an axial protrusion is formed at the middle position of the inner edge of each insulating sheet, and the axial protrusion extends to both ends of the insulating sheet for sliding fit with the axial groove on the inner support layer; two symmetrically distributed circumferential grooves are formed on the outer edge of each insulating sheet; axial guide holes are formed at the middle position of the two end faces of each insulating sheet.

[0065] Step 4: Install the insulation layer: Install multiple insulating sheets one by one along the circumference of the inner support layer, so that the axial protrusions of the inner edge of each insulating sheet pass through the corresponding axial grooves on the outer edge of the inner support layer. All insulating sheets in the same group are evenly distributed circumferentially around the inner support layer and adjacent insulating sheets keep in contact with each other, forming a complete annular insulating sleeve. Then, put the coil springs into the circumferential grooves on the outer edge of the insulating sheets in the same group, so that the coil springs radially tighten all the insulating sheets in the same group. Along the length of the inner support layer, install multiple groups of insulating sheets in sequence, and insert axial springs into the axial guide holes of the corresponding insulating sheets in adjacent groups to maintain a predetermined gap between the insulating sheets in adjacent groups.

[0066] Step 5: Forming the outer protective layer: After all the insulating sheets, coil springs, and axial springs of all groups have been installed, a layer of high-density polyethylene material is uniformly coated on the outer surface of the insulating layer using an extrusion coating process to form a cylindrical outer protective layer that completely covers the insulating layer inside.

[0067] Step 6, Post-processing: Cool and shape the completed long-life cable, perform online testing and cut to length to obtain the finished cable.

[0068] 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. A long-life cable with a self-healing insulation layer, characterized in that, The device comprises, from the inside out, a central conductor (1), an inner support layer (2), an insulating layer (3), and an outer protective layer (4). The central conductor (1) is conductive. The inner support layer (2) is fitted over the central conductor (1). The insulating layer (3) is fitted over the inner support layer (2). The outer protective layer (4) is fitted over the insulating layer (3). The insulating layer (3) includes insulating sheets (5), coil springs (6), and axial springs (7). Along the length of the inner support layer (2), the insulating sheets (5) are divided into multiple groups. The axial springs (7) are arranged between the insulating sheets (5) of adjacent layers. There are multiple insulating sheets (5) in the same group, and they are evenly distributed in a circle around the inner support layer (2). Adjacent insulating sheets (5) in the same group are in contact with each other. The insulating sheets (5) have an outer edge and an inner edge. The inner edge of the insulating sheet (5) contacts the inner support layer (2), and the outer edge of the insulating sheet (5) contacts the outer protective layer (4). An axial protrusion (8) is provided on the inner edge of the insulating sheet (5), and an axial groove (9) is provided on the outer edge of the inner support layer (2). The axial protrusion (8) passes through the axial groove (9). A circumferential groove (11) is provided on the outer edge of the insulating sheet (5). The circumferential grooves (11) of adjacent insulating sheets (5) in the same group are aligned with each other. The coil spring (6) is sleeved in the circumferential groove (11). An axial guide hole (10) is provided on the end face of the insulating sheet (5). The axial spring (7) passes through the axial guide hole (10) of the insulating sheet (5) in the adjacent group. There is a gap between the insulating sheets (5) in the adjacent group. The inner support layer (2), the insulating layer (3), and the outer protective layer (4) are all non-conductive.

2. A long-life cable with a self-healing insulation layer according to claim 1, characterized in that, One insulating sheet (5) corresponds to one axial protrusion (8). The axial protrusion (8) is located at the middle position of the inner edge of the insulating sheet (5). The number of axial protrusions (8) is the same as the number of axial grooves (9) and they are arranged in a one-to-one correspondence.

3. A long-life cable with a self-healing insulation layer according to claim 2, characterized in that, The length direction of the axial groove (9) is consistent with the length direction of the inner support layer (2), and the axial groove (9) extends to both ends of the inner support layer (2), while the axial protrusion (8) extends to both ends of the insulating sheet (5).

4. A long-life cable with a self-healing insulation layer according to claim 3, characterized in that, One insulating sheet (5) corresponds to two circumferential grooves (11), and the two circumferential grooves (11) are symmetrically distributed around the center of the insulating sheet (5). The same set of insulating sheets (5) corresponds to two coil springs (6).

5. A long-life cable with a self-healing insulation layer according to claim 4, characterized in that, One insulating sheet (5) corresponds to two axial guide holes (10), and the two axial guide holes (10) are symmetrically arranged at the middle position of the two end faces of the insulating sheet (5).

6. A long-life cable with a self-healing insulation layer according to any one of claims 1-5, characterized in that, The central conductor (1) is cylindrical, and the inner support layer (2) and the outer protective layer (4) are both cylindrical.

7. A long-life cable with a self-healing insulation layer according to claim 6, characterized in that, The diameter of the center conductor (1) is one-third to one-half the diameter of the long-life cable, the thickness of the inner support layer (2) is the same as the thickness of the insulating sheet (5), and the thickness of the outer protective layer (4) is one-third to one-half the thickness of the inner support layer (2).

8. A long-life cable with a self-healing insulation layer according to claim 7, characterized in that, The axial length of the insulating sheet (5) is 200mm-800mm.

9. A long-life cable with a self-healing insulation layer according to any one of claims 1-5, characterized in that, The number of insulating sheets (5) in the same group is 4-8.

10. A long-life cable with a self-healing insulation layer according to any one of claims 1-5, characterized in that, The central conductor (1) is made of copper, the inner support layer (2) is made of silicone, the insulating sheet (5) is made of polyolefin, and the outer protective layer (4) is made of high-density polyethylene.

Images