High temperature resistant, bend resistant medium voltage cable

Abstract

The application provides a high-temperature-resistant and bending-resistant medium-voltage cable, and relates to the technical field of power cables. The high-temperature-resistant and bending-resistant medium-voltage cable comprises a center support framework, three conductive cores, a bending-resistant filling assembly, a wrapping assembly and an outer protective assembly. The three conductive cores are arranged around the center support framework, and the center support framework supports and limits the three conductive cores. The bending-resistant filling assembly is filled between adjacent conductive cores and the periphery of the conductive cores. The center support framework supports and limits the three conductive cores, the high-temperature-resistant filling bearing strip fills the space between and around the conductive cores and forms a round periphery, so that the relative position and the roundness of the cable core are maintained when the conductive cores are fixedly operated at high temperature for a long time. When the cable is installed and bent, the flexible deformation accommodation component is deformed and accommodated through the deformation groove, the flexible limiting shoulder and the compression gap, and the limiting support is formed when the compression gap is reduced to the abutting of the two flexible limiting shoulders, so that the cable can be limited to continue to be bent.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and in particular to a high-temperature resistant and bending-resistant medium-voltage cable. Background Technology

[0002] Medium-voltage cables are widely used in industrial plants, energy equipment, metallurgical equipment and other power transmission sites. Some of these cables need to be laid through corners, cable trays or equipment interfaces, so they need to have the corresponding bending adaptability during the installation stage. After installation, they must be fixed in a fixed laying state and withstand the combined effects of conductor heating and external high temperature environment for a long time.

[0003] Existing medium-voltage cables typically use flexible filler materials to fill the gaps between multiple conductors. Although this allows the cable to bend during installation, under long-term high temperatures, the filler material is prone to continuous compression, thermal creep, or local collapse, causing the conductors to shift and damaging the roundness of the cable core. At the same time, the lack of a structure that gradually transitions from flexible deformation to limiting support during bending means that the insulation shielding structure outside the conductors is prone to large local stresses due to excessive bending.

[0004] If the cable core shape is maintained by increasing the overall stiffness of the filling structure, the bending resistance during cable installation will increase and the bending stress will concentrate. If a thicker heat insulation structure is set between the wrapping layer or the outer sheath, the path of heat transfer from the core to the external environment will be extended. Therefore, it is necessary to coordinate and cooperate among the installation bending capacity, bending limiting capacity, high temperature dimensional stability and radial heat transfer capacity. Summary of the Invention

[0005] To address the technical problems of existing medium-voltage cables lacking a progressive limiting structure during installation and bending, and being prone to continuous compression of filler material, core misalignment, core out-of-roundness, and poor heat transfer during long-term high-temperature fixed operation, this invention provides a high-temperature resistant and bending-resistant medium-voltage cable.

[0006] The technical solutions provided by the embodiments of the present invention are as follows: This invention provides a high-temperature resistant and bending-resistant medium-voltage cable, comprising: a central support frame, three conductive cores, a bending-resistant filling assembly, a wrapping assembly, and an outer sheath assembly; The three conductive cores are arranged around the central support frame, and the central support frame supports and limits the three conductive cores; The bending-resistant filling component fills the space between adjacent conductive cores and around the conductive cores; the wrapping component covers the outside of the bending-resistant filling component; and the outer protective component covers the outside of the wrapping component. The bending-resistant filling component includes a high-temperature resistant filling support strip and a flexible deformation relief component. The high-temperature resistant filling support strip is arranged between and around the three conductive cores to form a rounded outer perimeter. The flexible deformation relief component is arranged on the outer perimeter of the high-temperature resistant filling support strip and is spaced apart along the cable axis. The flexible deformation relief component includes a deformation groove, an inclined deformation groove wall, an inclined relief groove wall, and two flexible limiting shoulders. The inclined deformation groove wall and the inclined relief groove wall are arranged opposite to each other and form the deformation groove. The two flexible limiting shoulders are arranged opposite to each other at the bottom of the deformation groove and form a compression gap between them. The compression gap narrows as the cable bends, so that the two flexible retaining shoulders abut against each other.

[0007] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this invention, the central support frame supports and limits the three conductive cores. The high-temperature resistant filler strip fills the space between and around the conductive cores, forming a rounded outer perimeter, so that the conductive cores maintain their relative position and cable core roundness during long-term high-temperature fixed operation. When bending during installation, the flexible deformation clearance component deforms and clearances through the deformation groove, flexible limiting shoulder, and compression gap. When the compression gap shrinks to the point where the two flexible limiting shoulders abut each other, a limiting support is formed, which can limit the cable from bending further. The heat dissipation gap in the wrapping assembly is used to balance local heat and provide a margin for interlayer thermal expansion deformation. The heat of the cable operation is transferred outward through the high-temperature resistant filler strip, wrapping assembly, armor layer, and high-temperature resistant outer sheath, thereby taking into account both installation bending performance and structural stability during long-term high-temperature fixed operation. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the overall structure of a high-temperature resistant and bending-resistant medium-voltage cable provided in an embodiment of the present invention.

[0010] Figure 2 This is a schematic diagram of the cross-sectional structure of a high-temperature resistant and bending-resistant medium-voltage cable provided in an embodiment of the present invention.

[0011] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0012] Figure 4 for Figure 2A magnified schematic diagram of the structure at point B in the middle.

[0013] Figure 5 This is a schematic diagram of a partial stripping structure of the outer sheath of a high-temperature resistant and bending-resistant medium-voltage cable provided in an embodiment of the present invention.

[0014] Figure 6 This is a schematic diagram of the partial stripping structure of the wrapping assembly and outer sheath assembly of a high-temperature resistant and bending-resistant medium-voltage cable provided in an embodiment of the present invention.

[0015] Figure 7 This is a schematic diagram of a partial stripping structure of the anti-bending filler component of a high-temperature resistant and bend-resistant medium-voltage cable provided in an embodiment of the present invention.

[0016] Figure 8 This is a schematic diagram of the central support frame and exposed conductive core of a high-temperature resistant and bend-resistant medium-voltage cable provided in an embodiment of the present invention.

[0017] Figure 9 This is a schematic diagram of the flexible deformation clearance component of a high-temperature resistant and bending-resistant medium-voltage cable provided in an embodiment of the present invention, viewed from one perspective.

[0018] Figure 10 This is a schematic diagram of the flexible deformation clearance component of a high-temperature resistant and bending-resistant medium-voltage cable provided in an embodiment of the present invention, viewed from another perspective.

[0019] Reference numerals: 1. Central support frame; 11. Filler rope; 12. Deformation gap; 13. Fitting support layer; 14. Fitting arc surface; 2. Conductive core; 21. Metal wire core; 22. Insulating shielding sheath; 3. Anti-bending filler assembly; 31. High-temperature resistant filler bearing strip; 32. Flexible deformation clearance component; 321. Deformation groove; 322. Inclined deformation groove wall; 323. Inclined clearance groove wall; 324. Flexible limiting shoulder; 325. Compression gap; 4. Wrapping assembly; 41. Inner wrapping tape; 42. Outer wrapping tape; 43. Heat dissipation gap; 5. Outer protective assembly; 51. Armor layer; 52. High-temperature resistant outer sheath.

[0020] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0021] The technical solutions of the present invention will now be described with reference to the accompanying drawings. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies. Furthermore, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0022] like Figures 1 to 10 As shown, an embodiment of the present invention provides a high-temperature resistant and bending-resistant medium-voltage cable, including a central support frame 1, three conductive cores 2, a bending-resistant filling component 3, a wrapping component 4, and an outer sheath component 5.

[0023] Reference Figure 1 and Figure 2 The central support frame 1 is located at the center of the cable. Three conductive cores 2 are spaced apart along the circumference of the central support frame 1. The anti-bending filling component 3 is located between the three conductive cores 2 and around the three conductive cores 2. The wrapping component 4 covers the rounded outer circumference formed by the anti-bending filling component 3. The outer sheath component 5 covers the outside of the wrapping component 4, thus forming an overall structure that supports and covers the cable sequentially from the center outward.

[0024] The central support frame 1 includes a filling rope 11 and a fitting support layer 13 disposed around the filling rope 11. The outer surface of the filling rope 11 has multiple deformation gaps 12 equidistantly opened along the circumferential direction. The multiple fitting support layers 13 are attached to the outer edge of the filling rope 11 and arranged in an array along the circumferential direction of the filling rope 11, so that the central support frame 1 forms a support position corresponding to the three conductive cores 2 in the cross section.

[0025] Reference Figure 2 and Figure 4 Each interlocking support layer 13 has a fitting arc surface 14 on the side facing the corresponding conductive core 2. The three fitting arc surfaces 14 are respectively fitted to the outer peripheral surfaces of the three conductive cores 2. The arc contour of the fitting arc surface 14 matches the outer peripheral contour of the corresponding conductive core 2, so that the three conductive cores 2 are distributed at intervals around the central support frame 1.

[0026] The filler rope 11 is located in the central area surrounded by three conductive cores 2. The interlocking support layer 13 is located between the filler rope 11 and the corresponding conductive core 2. The fitting arc surface 14 supports the conductive core 2 from the side of the conductive core 2 toward the center of the cable. Multiple deformation gaps 12 are located between adjacent interlocking support layers 13, thereby separating the support positions of the central support frame 1 from each other.

[0027] Each conductive core 2 includes a metal wire core 21 and an insulating shielding sheath 22. The insulating shielding sheath 22 continuously covers the outside of the metal wire core 21. The fitting arc surface 14 of the central support frame 1 is fitted with the outer surface of the insulating shielding sheath 22, so that the metal wire core 21 is separated from the central support frame 1 by the insulating shielding sheath 22.

[0028] Three conductive cores 2 are equidistantly arranged along the circumference of the central support frame 1. A filling area is formed between two adjacent conductive cores 2, and an outer filling area is formed between the periphery of the three conductive cores 2 and the wrapping assembly 4. The anti-bending filling assembly 3 simultaneously fills the filling area between adjacent conductive cores 2 and the outer filling area of ​​the conductive cores 2.

[0029] Reference Figure 2 , Figure 7 and Figure 8 The bending filler assembly 3 includes a high-temperature resistant filler support strip 31 and multiple flexible deformation relief components 32. The high-temperature resistant filler support strip 31 fills between adjacent insulating shielding sheaths 22 and surrounds the periphery of the three insulating shielding sheaths 22, so that the three conductive cores 2, the central support frame 1 and the high-temperature resistant filler support strip 31 together form a rounded outer periphery of the cable core.

[0030] The high-temperature resistant filler support strip 31 contacts the insulating shielding sheath 22 of the three conductive cores 2 on the side facing the inside of the cable, and contacts the wrapping assembly 4 on the side facing the outside of the cable. The central support frame 1 supports the three conductive cores 2 from the inside, and the high-temperature resistant filler support strip 31 fills and supports the three conductive cores 2 from the space between adjacent conductive cores 2 and from the outside of the conductive cores 2, thereby jointly restricting the relative displacement of the three conductive cores 2 within the cross-section of the cable.

[0031] Multiple flexible deformation relief components 32 are disposed on the outer periphery of the high-temperature resistant filler support strip 31 and are arranged at intervals along the cable axis. The bearing section of the high-temperature resistant filler support strip 31 is retained between adjacent flexible deformation relief components 32 in the same circumferential position, so that the high-temperature resistant filler support strip 31 still maintains its bearing function on the outer periphery of the cable core after the flexible deformation relief components 32 are disposed.

[0032] The flexible deformation relief components 32 located at different circumferential positions are staggered along the cable axis, so that the deformation areas at different circumferential positions are not concentrated on the same cross section of the cable. When the cable is installed and bent, the flexible deformation relief components 32 located on the inside and outside of the bend can generate corresponding deformations respectively, while the high-temperature resistant filler support strip 31 located at different axial positions supports the circumferential direction.

[0033] Reference Figure 9 and Figure 10Each flexible deformation relief component 32 includes a deformation groove 321, an inclined deformation groove wall 322, an inclined relief groove wall 323, two flexible limiting shoulders 324, and a compression gap 325. The deformation groove 321 is disposed on the outer periphery of the high-temperature resistant filling support strip 31. The inclined deformation groove wall 322 and the inclined relief groove wall 323 are disposed opposite to each other and together form the two side boundaries of the deformation groove 321.

[0034] The deformation groove 321 extends radially from the inside to the outside along the cable. The inclined deformation groove wall 322 and the inclined relief groove wall 323 are both inclined in the direction from the center of the cable to the outside. The distance between the inclined deformation groove wall 322 and the inclined relief groove wall 323 gradually increases, so that the deformation groove 321 forms a groove-shaped structure that is open to the outer periphery of the high temperature resistant filling support strip 31.

[0035] Two flexible limiting shoulders 324 are fixedly installed on both sides of the bottom wall of the deformation groove 321. The outer surface of one flexible limiting shoulder 324 is in contact with the inclined deformation groove wall 322, and the outer surface of the other flexible limiting shoulder 324 is in contact with the inclined relief groove wall 323. A compression gap 325 is formed between the end faces of the two flexible limiting shoulders 324 facing each other.

[0036] When the cable is in an unbent state, a compression gap 325 is maintained between the two flexible limiting shoulders 324. The inclined deformation groove wall 322, the inclined relief groove wall 323, and the two flexible limiting shoulders 324 together maintain the initial structural state of the flexible deformation relief component 32, so that the deformation groove 321 has space for shape change when installed and bent.

[0037] Reference Figure 2 , Figure 3 , Figure 5 and Figure 6 The wrapping assembly 4 includes an inner wrapping tape 41 and an outer wrapping tape 42. The inner wrapping tape 41 wraps around the rounded outer periphery formed by the high-temperature resistant filler support strip 31, and the outer wrapping tape 42 wraps around the outside of the inner wrapping tape 41, so as to maintain the combined state of the bending-resistant filler assembly 3 and the three conductive cores 2 through the two-layer wrapping structure.

[0038] Both the inner wrapping tape 41 and the outer wrapping tape 42 are continuously wrapped along the extension direction of the cable. The overlap positions of the inner wrapping tape 41 and the outer wrapping tape 42 are staggered, so that the overlap areas of the two wrapping tapes are not concentrated in the same circumferential position. The contact position between the inner wrapping tape 41 and the outer wrapping tape 42 forms an interlayer contact area through which heat is transferred from the high-temperature resistant filler strip 31 to the outer sheath assembly 5.

[0039] A local non-contact area between the inner wrapping tape 41 and the outer wrapping tape 42 forms a heat dissipation gap 43. The heat dissipation gap 43 is located between the two wrapping tapes and is distributed along the wrapping direction. The heat dissipation gap 43 is a closed interlayer local gap and is not directly connected to the external environment of the cable.

[0040] The heat dissipation gap 43, the interlayer contact area of ​​the inner wrapping tape 41 and the outer wrapping tape 42 are distributed in the wrapping assembly 4. The interlayer contact area is used to maintain radial heat transfer. The heat dissipation gap 43 is used to balance the local heat inside the wrapping assembly 4 and to provide a margin for thermal expansion deformation between the inner wrapping tape 41 and the outer wrapping tape 42, thereby avoiding the use of the heat dissipation gap 43 as a direct ventilation structure.

[0041] The outer protective component 5 includes an armor layer 51 and a high-temperature resistant outer sheath 52. The armor layer 51 covers the outside of the outer wrapping tape 42, and the high-temperature resistant outer sheath 52 continuously covers the outside of the armor layer 51, so that the armor layer 51 is located between the wrapping component 4 and the high-temperature resistant outer sheath 52.

[0042] The armor layer 51 is used to protect the wrapping assembly 4 and its inner cable core structure from abrasion, provide buffering and structural protection. The high-temperature resistant outer sheath 52 forms the outermost protective structure of the cable. The armor layer 51 is set as an abrasion-resistant buffer layer rather than as a thick heat insulation layer to block radial heat transfer, so as to keep the internal heat of the cable transferred outward through the armor layer 51 and the high-temperature resistant outer sheath 52.

[0043] It should be noted that the cable in this embodiment is used for fixed laying, and the flexible deformation relief component 32 is used to adapt to the bending of the cable during the installation process according to the laying path. After the cable is installed, it remains in a fixed state and therefore does not require the flexible deformation relief component 32 to withstand continuous reciprocating cyclic bending.

[0044] Before the installation bending begins, the central support frame 1 supports the three conductive cores 2 through three fitting arc surfaces 14, the high temperature resistant filling support strip 31 fills the space between and around the three conductive cores 2, the wrapping assembly 4 keeps the cable core round from the outside of the high temperature resistant filling support strip 31, and the two flexible limiting shoulders 324 in the flexible deformation clearance component 32 remain separated and form a compression gap 325 between them.

[0045] When the cable is bent during installation, the arc length on the outer side of the bend increases, and the deformation groove 321 located on the outer side of the bend opens along its opening direction. The distance between the inclined deformation groove wall 322 and the inclined relief groove wall 323 increases accordingly. The flexible limiting shoulder 324 undergoes elastic deformation with the high-temperature resistant filling bearing strip 31, so that the outer side of the bend adapts to the change in arc length through the opening of the deformation groove 321.

[0046] At the same time, the arc length on the inner side of the cable bend decreases, the deformation groove 321 located on the inner side of the bend narrows, the inclined deformation groove wall 322 and the inclined relief groove wall 323 move closer to each other, and the two flexible limiting shoulders 324 move closer to each other as the deformation groove 321 narrows, so that the compression gap 325 gradually shrinks.

[0047] Because the flexible deformation relief components 32 at different circumferential positions are staggered along the cable axis, the opening deformation on the outside of the bend and the narrowing deformation on the inside of the bend occur dispersed along the cable axis. The section of the high-temperature resistant filler support strip 31 that does not have the corresponding flexible deformation relief component 32 continues to support the conductive core 2 and maintain the outer periphery of the cable core, so that the deformation required for installation bending is not concentrated on the same cross section.

[0048] When the cable bends to the limit state, the compression gap 325 located on the inside of the bend shrinks until the two flexible limiting shoulders 324 abut against each other. The two flexible limiting shoulders 324 change from a deformed state of approaching each other to a supporting state of abutment. The flexible limiting shoulders 324 continue to transmit the effect of bending to the high temperature resistant filling support strip 31 through the corresponding inclined deformation groove wall 322 and inclined relief groove wall 323, thereby limiting the deformation groove 321 from continuing to narrow and limiting the cable from continuing to bend.

[0049] During the bending process described above, the central support frame 1 is always located between the three conductive cores 2, and the three fitting arc surfaces 14 respectively fit the insulating shielding sleeves 22 of the three conductive cores 2. The high-temperature resistant filling and bearing strip 31 maintains the filling of the space between adjacent conductive cores 2 and the surrounding space, so that the three conductive cores 2 are still supported by the center and the surrounding space during bending deformation and bending limit process.

[0050] After the cable is bent and fixed along the installation path, the flexible deformation clearance component 32 no longer bears repeated cyclic bending. The central support frame 1 maintains the circumferential spacing of the three conductive cores 2 through the fitting arc surface 14. The high temperature resistant filling bearing strip 31 maintains the filling state between the three conductive cores 2 and the surrounding space. The wrapping assembly 4 maintains the rounded outer perimeter formed by the anti-bending filling assembly 3.

[0051] During long-term high-temperature fixed operation, the central support frame 1 and the high-temperature resistant filling support strip 31 support the conductive core 2 from the inside and outside of the three conductive cores 2 respectively. The flexible deformation clearance component 32, together with the high-temperature resistant filling support strip 31, inhibits the continuous compression of the filling structure and the displacement of the conductive core 2, so that the relative position of the three conductive cores 2 and the roundness of the cable core remain stable.

[0052] The heat generated by the metal core 21 during operation is first transferred outward through the insulating shielding sheath 22 covering it, and then transferred to the high-temperature resistant filler strip 31 that is in contact with the insulating shielding sheath 22. The high-temperature resistant filler strip 31 transfers the heat to the inner wrapping tape 41 that is in contact with it. The heat is transferred to the outer wrapping tape 42 through the interlayer contact area between the inner wrapping tape 41 and the outer wrapping tape 42.

[0053] The heat transferred to the outer wrapping tape 42 continues to be transferred outward to the armor layer 51, and then from the armor layer 51 to the high-temperature resistant outer sheath 52 and finally to the external environment, thus forming a radial heat transfer path of "conductive core 2 - high-temperature resistant filler strip 31 - inner wrapping tape 41 and outer wrapping tape 42 - armor layer 51 - high-temperature resistant outer sheath 52 - external environment".

[0054] During the heat transfer process described above, the heat dissipation gap 43 is used to balance the local heat between the inner wrapping tape 41 and the outer wrapping tape 42 and to accommodate the interlayer thermal expansion and deformation. The interlayer contact area between the inner wrapping tape 41 and the outer wrapping tape 42 continues to bear radial heat transfer. The armor layer 51 bears the functions of anti-wear, buffering and structural protection without blocking the heat from continuing to be transferred to the high-temperature resistant outer sheath 52.

[0055] In summary, the high-temperature resistant and bending-resistant medium-voltage cable designed in this invention maintains the relative position and core roundness of the three conductive cores 2 through the central support frame 1 and the high-temperature resistant filling support strip 31. The flexible deformation relief components 32, which are spaced along the cable axis and staggered in different circumferential positions, achieve dispersed deformation during installation bending. After the compression gap 325 is reduced to the point where the two flexible limiting shoulders 324 abut against each other, a limiting support is formed. The high-temperature resistant filling support strip 31, the wrapping assembly 4, the armor layer 51, and the high-temperature resistant outer sheath 52 form a heat transfer path from the inside to the outside, so that the cable can take into account bending during installation, limiting after bending, and fixed operation under long-term high-temperature environment.

[0056] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this invention, the central support frame supports and limits the three conductive cores. The high-temperature resistant filler strip fills the space between and around the conductive cores and forms a rounded outer perimeter, so that the conductive cores maintain their relative position and cable core roundness during long-term high-temperature fixed operation. When bending during installation, the flexible deformation clearance component deforms and clearances through the deformation groove, flexible limiting shoulder and compression gap. When the compression gap shrinks to the point where the two flexible limiting shoulders abut each other, a limiting support is formed, which can limit the cable from bending further. The heat dissipation gap in the wrapping assembly 4 is used to balance local heat and provide a margin for interlayer thermal expansion deformation. The heat of the cable operation is transferred outward through the high-temperature resistant filler strip, wrapping assembly, armor layer and high-temperature resistant outer sheath, thus taking into account both installation bending performance and structural stability during long-term high-temperature fixed operation.

[0057] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the preferred embodiments, while those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0058] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-temperature resistant and bending-resistant medium-voltage cable, characterized in that, include: Central support frame, three conductive cores, bending resistance filling component, wrapping component and outer sheath component; The three conductive cores are arranged around the central support frame, and the central support frame supports and limits the three conductive cores; The bending-resistant filling component fills the space between adjacent conductive cores and around the conductive cores; the wrapping component covers the outside of the bending-resistant filling component; and the outer protective component covers the outside of the wrapping component. The bending-resistant filling component includes a high-temperature resistant filling support strip and a flexible deformation relief component. The high-temperature resistant filling support strip is arranged between and around the three conductive cores to form a rounded outer perimeter. The flexible deformation relief component is arranged on the outer perimeter of the high-temperature resistant filling support strip and is spaced apart along the cable axis. The flexible deformation relief component includes a deformation groove, an inclined deformation groove wall, an inclined relief groove wall, and two flexible limiting shoulders. The inclined deformation groove wall and the inclined relief groove wall are arranged opposite to each other and form the deformation groove. The two flexible limiting shoulders are arranged opposite to each other at the bottom of the deformation groove and form a compression gap between them. The compression gap narrows as the cable bends, so that the two flexible retaining shoulders abut against each other.

2. The high-temperature resistant and bending-resistant medium-voltage cable according to claim 1, characterized in that, The central support frame includes a filling rope, an interlocking support layer, and a conforming curved surface; The outer surface of the filling rope is provided with multiple deformation gaps at equal intervals along the circumference; Multiple interlocking support layers are attached to the outer edge of the filling rope and arranged in an array along the circumferential direction of the filling rope, and the outer surface of each interlocking support layer forms an interlocking arc surface.

3. The high-temperature resistant and bending-resistant medium-voltage cable according to claim 2, characterized in that, The central support frame is provided with three fitting arc surfaces; The three conductive cores are equidistantly arranged along the circumferential direction of the central support frame. Each of the fitting arc surfaces is in contact with the outer circumferential surface of one of the conductive cores. The three fitting arc surfaces together support and radially limit the three conductive cores.

4. The high-temperature resistant and bending-resistant medium-voltage cable according to claim 3, characterized in that, The conductive core includes a metal wire core and an insulating shielding sheath; The insulating shielding sheath continuously covers the outside of the metal wire core, and the fitting arc surface is in contact with the outer surface of the insulating shielding sheath.

5. The high-temperature resistant and bending-resistant medium-voltage cable according to claim 4, characterized in that, The high-temperature resistant filler strip extends along the cable axial direction; The high-temperature resistant filler strip fills the space between adjacent insulating shielding sleeves and surrounds the periphery of the three insulating shielding sleeves. The outer surface of the high-temperature resistant filler strip forms a rounded outer circumferential surface that fits into the wrapping assembly.

6. The high-temperature resistant and bending-resistant medium-voltage cable according to claim 5, characterized in that, The deformation groove includes an inclined deformation groove wall and an inclined clearance groove wall; The deformation groove extends radially from the inside to the outside along the cable. The inclined deformation groove wall and the inclined relief groove wall are located on both sides of the axial direction of the deformation groove. The distance between the inclined deformation groove wall and the inclined relief groove wall gradually increases radially from the inside to the outside along the cable.

7. The high-temperature resistant and bending-resistant medium-voltage cable according to claim 6, characterized in that, A flexible limiting shoulder is fixedly provided on each side of the bottom wall of the deformation groove; The outer surface of one of the flexible limiting shoulders is in contact with the inclined deformation groove wall, and the outer surface of the other flexible limiting shoulder is in contact with the inclined relief groove wall. The end faces of the two flexible limiting shoulders facing each other respectively form the two side boundaries of the compression gap.

8. The high-temperature resistant and bending-resistant medium-voltage cable according to claim 7, characterized in that, The outer periphery of the high-temperature resistant filler support strip is provided with multiple flexible deformation clearance components; Multiple flexible deformation relief components are disposed at different circumferential positions of the high-temperature resistant filler strip, and the flexible deformation relief components located at different circumferential positions are staggered from each other along the cable axis.

9. The high-temperature resistant and bending-resistant medium-voltage cable according to claim 8, characterized in that, The wrapping assembly includes an inner wrapping tape and an outer wrapping tape; The inner wrapping tape and the outer wrapping tape are wrapped around the outside of the high-temperature resistant filler strip from the inside out, and the overlap positions of the inner wrapping tape and the outer wrapping tape are staggered. The local non-contact area between the inner wrapping tape and the outer wrapping tape forms a heat dissipation gap.

10. The high-temperature resistant and bending-resistant medium-voltage cable according to claim 9, characterized in that, The outer protective assembly includes an armor layer and a high-temperature resistant outer sheath; The armor layer covers the outside of the outer wrapping tape, and the high-temperature resistant outer sheath continuously covers the outside of the armor layer; The high-temperature resistant filler strip is bonded to the insulating shielding sheath, the inner wrapping tape is bonded to the high-temperature resistant filler strip, the armor layer is bonded to the outer wrapping tape, and the high-temperature resistant outer sheath is bonded to the armor layer.

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