An environmentally friendly composite low-voltage power cable

Abstract

The present invention discloses an environmentally friendly composite low-voltage power cable, which relates to the technical field of low-voltage cables. The outer side of the central conductor is tightly coated with an insulating inner layer, the outer side of the insulating inner layer is tightly coated with a protective inner layer, the outer sides of the three protective inner layers are jointly coated with a limited inner layer, the outer side of the limited inner layer is tightly coated with a protective braided layer, and the protective braided layer is tightly coated with an isolation outer layer. The present invention enables the sealing flexible layer and the elastic expansion layer to actively expand outward, thereby actively increasing the outer diameter of the cable, and utilizes the gas cavity formed between the sealing flexible layer and the elastic expansion layer to effectively increase the overall flexibility of the cable, so that the outer side of the cable can be elastically deformed by slight extrusion from the outside, and can be promptly restored after the pressure is removed, thereby effectively avoiding external extrusion directly causing deformation and displacement of the internal conductor of the cable to affect the normal use of the cable, thereby effectively improving the stability of the use of the power cable.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage cables, in particular to an environmentally friendly composite low-voltage power cable. Background Art

[0002] Power cables are cables used to transmit and distribute electric energy. They are commonly used in urban underground power grids, power station lead-out lines, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seas. The proportion of cables in power lines is gradually increasing. Power cables are cable products used to transmit and distribute high-power electric energy in the trunk lines of power systems, including 1-500kV and above various voltage levels, various insulation power cables;

[0003] However, due to the lack of corresponding auxiliary structures during the use of cables, the hardness of the cables cannot be adjusted according to the requirements of the use environment during use. At the same time, due to the influence of the structural properties of the protective layer on the outside of the cable, the cable is easily deformed after being squeezed, which causes the conductor inside the cable to move and deform, affecting the normal use of the cable and reducing the performance of the cable. Summary of the invention

[0004] The present invention provides an environmentally friendly composite low-voltage power cable, which can effectively solve the problem that the cable proposed in the above background technology lacks corresponding auxiliary structures during use, resulting in the cable being unable to adjust the hardness of the cable according to the requirements of the use environment during use, and at the same time, affected by the structural properties of the protective layer on the outside of the cable, the cable is easily deformed after being squeezed, thereby causing the conductor inside the cable to be displaced and deformed, affecting the normal use of the cable and reducing the performance of the cable.

[0005] To achieve the above object, the present invention provides the following technical solution: an environmentally friendly composite low-voltage power cable, comprising a central conductor, the outer side of the central conductor is tightly coated with an insulating inner layer, and the outer side of the insulating inner layer is tightly coated with a protective inner layer;

[0006] The outer side of the protective inner layer is provided with a gas-liquid circulation type protective cooling mechanism, which is used to actively circulate the gas and liquid inside the cable, and to adjust the heat inside the cable during the gas-liquid circulation process, and at the same time, to adjust the hardness of the outer side of the cable by adjusting the gas-liquid pressure in the circulation, so as to achieve protection of the outer side of the cable;

[0007] The gas-liquid circulation type protective cooling mechanism comprises a limiting inner layer;

[0008] The three protective inner layers are coated with a limited inner layer on the outside, the limited inner layer is tightly coated with a protective braided layer on the outside, the protective braided layer is tightly coated with an isolation outer layer, the isolation outer layer is uniformly coated with an elastic telescopic layer on the outside, the elastic telescopic layer is tightly coated with a protective ridge layer on the outside, and reinforcing thin cables are tightly interspersed inside the convex strips on the outside of the protective ridge layer;

[0009] The outer side of the protective ridge layer is tightly coated with a sealing flexible layer, the outer side of the sealing flexible layer is evenly provided with an elastic expansion layer, the outer side of the elastic expansion layer is tightly coated with a diffusion groove sleeve, the outer side of the diffusion groove sleeve is evenly and equidistantly provided with mounting annular grooves, the inside of the mounting annular groove is symmetrically clamped with a connecting guide ring, the top of one side of the connecting guide ring is fixedly installed with an upper air guide tube, the bottom of one side of the connecting guide ring is fixedly installed with a lower liquid guide tube, and the inner ring of the connecting guide ring is evenly and fixedly connected with a liquid distribution thin tube along the circumferential direction at a position inside the elastic expansion layer corresponding to the inner ring of the connecting guide ring;

[0010] The end of the upper gas guide tube is connected to a connecting gas valve through a threaded tube, and the ends of the multiple connecting gas valves are commonly fixedly connected to a gas transmission outer tube; the end of the lower liquid guide tube is connected to a connecting liquid valve through a threaded tube, and the ends of the multiple connecting liquid valves are fixedly connected to a liquid transmission outer tube through a pipeline;

[0011] The outer side of the diffusion slot sleeve is coated with a heat-conducting flexible layer at a position corresponding to the side of the connecting guide ring, and the outer side of the heat-conducting flexible layer is coated with a protective outer layer at a position corresponding to the side of the connecting guide ring.

[0012] Preferably, axial grooves are evenly arranged inside the elastic telescopic layer along the circumferential direction, and the elastic telescopic layer and the protective ridge layer are both made of elastic material.

[0013] Preferably, the inner circle of the sealing flexible layer is tightly wrapped and fitted with the outer side of the protective edge layer, a gap is left between the outer side of the sealing flexible layer and the inner side of the elastic expansion layer, and both the sealing flexible layer and the elastic expansion layer can be elastically expanded and contracted.

[0014] Preferably, expansion slots are evenly and equidistantly formed on the outer side of the diffusion slot sleeve in the axial and circumferential directions, the thermally conductive flexible layer is made of a soft elastic material, and the diffusion slot sleeve can fit with the thermally conductive flexible layer after expansion.

[0015] Preferably, the outer side of the liquid distributing tube is tightly fitted with the inner wall of the groove of the sealing flexible layer, and the end of the liquid distributing tube is connected with the inner cavity of the connecting guide ring.

[0016] Preferably, the end of the gas transmission outer tube is connected to an external gas supply pipeline, and the end of the liquid infusion outer tube is connected to an external liquid infusion pipeline.

[0017] Preferably, an internal liquid alternating expansion heat exchange mechanism is provided inside the limiting inner layer, and the internal liquid alternating expansion heat exchange mechanism is used to provide auxiliary support to the inside of the cable, and actively cool the center of the cable by driving the active circulation of the cooling liquid inside the cable;

[0018] The internal liquid alternate expansion heat exchange mechanism includes a liquid guide valve;

[0019] The sides of the two outer infusion tubes are fixedly connected with a liquid guide valve through a pipeline, and the ends of the two liquid guide valves are fixedly connected with an infusion transverse tube. The side of the infusion transverse tube corresponds to the inner center of the limiting inner layer and is fixedly connected with a central liquid guide tube. The outer side of the central liquid guide tube is evenly sleeved with a limiting rubber strip at equal distances, and the outer side of the central liquid guide tube is evenly fixedly connected with a connecting side tube at equal distances in the circumferential direction and the axial direction;

[0020] A telescopic support bag is fixedly connected to the end of the connecting side tube at a position on one side of the limiting rubber strip, mounting rubber rings are bonded to both ends of the telescopic support bag, an elastic cone cover is bonded to the end of the mounting rubber ring, a limiting elastic rope is fixedly connected to the end of the elastic cone cover, and filling cotton blocks are filled at both ends of the telescopic support bag.

[0021] Preferably, the transverse infusion tube is interconnected with the central catheter and the external infusion tube, the connecting side tube passes through the middle of the limiting rubber strip, and the end of the connecting side tube is interconnected with the inner cavity of the telescopic support bag.

[0022] Preferably, the outer curved surface of the limiting rubber strip is tightly fitted with the outer side of the protective inner layer, and the outer straight surface of the limiting rubber strip is tightly fitted with the inner side surface of the telescopic support bag.

[0023] Preferably, the end of the limiting elastic rope is fixedly connected to the end of the telescopic support bag, and the interior of the chamber formed by the telescopic support bag and the elastic cone cover is filled with cooling liquid.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a scientific and reasonable structure and is safe and convenient to use:

[0025] 1. A gas-liquid circulation type protective cooling mechanism is provided. The use process of the power cable is optimized through the mutual cooperation between the components inside the gas-liquid circulation type protective cooling mechanism. The use process of the power cable is optimized through the mutual cooperation between the gas transmission outer tube and the liquid transmission outer tube and the sealing flexible layer and the elastic expansion layer. The cavity between the sealing flexible layer and the elastic expansion layer can be inflated through the gas transmission outer tube, so that the sealing flexible layer and the elastic expansion layer can actively expand outward, thereby actively increasing the outer diameter of the cable, and the gas cavity formed between the sealing flexible layer and the elastic expansion layer effectively increases the overall flexibility of the cable, so that the outer side of the cable can be elastically deformed by slight compression from the outside, and can be promptly restored after the pressure is removed, thereby effectively avoiding the deformation and displacement of the internal conductor of the cable caused by external compression directly affecting the normal use of the cable, thereby effectively improving the stability of the use of the power cable;

[0026] When auxiliary heat dissipation of the outer side of the cable is required, the circulating liquid can be continuously supplied to the inner cavity of the sealing flexible layer and the elastic expansion layer through the infusion outer tube, and the heat can be continuously exchanged with the inside of the cable during the flow of the circulating liquid, and the heat inside the cable can be quickly removed during the flow of the circulating liquid, thereby effectively accelerating the heat dissipation efficiency of the outer side of the cable. At the same time, by strengthening the pressure between the inner cavity of the sealing flexible layer and the elastic expansion layer, the outer side of the cable is protected by high-pressure circulating liquid, thereby effectively improving the protection performance of the outer side of the cable;

[0027] At the same time, through the cooperation between the elastic expansion layer and the protective edge layer, the liquid distribution tube and the sealing flexible layer are assisted in positioning to prevent the sealing flexible layer and the liquid distribution tube from being displaced during the use of the cable. At the same time, through the deformable flexible structure design of the elastic expansion layer, the internal structure of the cable can have sufficient displacement with the external structure, which effectively prevents the internal structure from directly shaking when the cable is subjected to external shaking and squeezing, thereby improving the stability of the internal structure of the cable. In the process of power cable installation, the gas transmission outer tube and the liquid transmission outer tube can be used for auxiliary fixation, thereby effectively improving the stability of cable installation.

[0028] 2. An internal liquid alternating expansion heat exchange mechanism is provided. The mutual cooperation between the components inside the internal liquid alternating expansion heat exchange mechanism optimizes the installation and use process of the cable. The limiting rubber strip and the components connected thereto can be installed inside the limiting inner layer through the central liquid guide tube. The inside of the telescopic support bag can be alternately filled with liquid through the infusion outer tube and the central liquid guide tube. Then, the inside of the cable is rapidly heat-exchanged through the alternating flow of the circulating liquid inside the telescopic support bag. The mutual cooperation between the elastic cone cover and the limiting elastic rope accelerates the flow efficiency of the circulating liquid inside the cable, so as to realize rapid cooling and heat dissipation from the middle of the cable, effectively improving the cooling and heat dissipation efficiency of the cable.

[0029] At the same time, the gaps between the protective inner layers are filled by means of the telescopic support bag and the filling cotton block, and the internal pressure of the telescopic support bag is adjusted by means of the liquid guide valve and the infusion cross tube. The pressure inside the telescopic support bag is increased to increase the overall hardness of the telescopic support bag, and then the protective inner layer is supported and limited by the limiting rubber strip and the telescopic support bag, which effectively prevents the central conductor from shaking during the cable installation process, thereby effectively improving the stability of the cable installation.

[0030] In summary, the installation and cooling process of the cable during use is optimized through the mutual cooperation between the gas-liquid circulation protective cooling mechanism and the internal liquid alternating expansion heat exchange mechanism. The outer side of the cable can be assisted to be fixed by the gas transmission outer tube and the liquid transmission outer tube, thereby effectively improving the stability of the cable installation. At the same time, the gas and liquid inside the cable can be dynamically adjusted by connecting the guide ring and the central liquid guide tube through the gas transmission outer tube and the liquid transmission outer tube, thereby adjusting the flexibility and hardness of the outer side of the cable during the flow of gas and liquid, and accelerating the heat dissipation process inside the cable through the flow of circulating liquid, thereby effectively improving the convenience of cable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0032] In the attached picture:

[0033] Figure 1 It is a schematic diagram of the structure of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the end face of the present invention;

[0035] Figure 3 It is a schematic diagram of the structure of the installation of the liquid distributing capillary tube of the present invention;

[0036] Figure 4 It is a structural schematic diagram of the gas-liquid circulation type protective cooling mechanism of the present invention;

[0037] Figure 5 It is a schematic diagram of the structure of the installation of the protective braided layer of the present invention;

[0038] Figure 6 The present invention Figure 5 A partial enlarged view of the middle A;

[0039] Figure 7 It is a structural schematic diagram of the internal liquid alternate expansion heat exchange mechanism of the present invention;

[0040] Figure 8 It is a structural schematic diagram of the installation of the elastic cone cover of the present invention;

[0041] Numbers in the figure: 1, center conductor; 2, insulation inner layer; 3, protective inner layer;

[0042] 4. Gas-liquid circulation type protective cooling mechanism; 401. Limiting inner layer; 402. Protective braided layer; 403. Isolation outer layer; 404. Elastic expansion layer; 405. Protective ridge layer; 406. Strengthening thin rope; 407. Sealing flexible layer; 408. Elastic expansion layer; 409. Diffusion groove sleeve; 410. Installing annular groove; 411. Connecting guide ring; 412. Gas guide upper tube; 413. Liquid guide lower tube; 414. Liquid distribution thin tube; 415. Connecting gas valve; 416. Gas transmission outer tube; 417. Connecting liquid valve; 418. Liquid transmission outer tube; 419. Thermally conductive flexible layer; 420. Protective outer layer;

[0043] 5. Internal liquid alternating expansion and heat exchange mechanism; 501. Liquid guide valve; 502. Infusion transverse tube; 503. Central liquid guide tube; 504. Limiting rubber strip; 505. Connecting side tube; 506. Telescopic support bag; 507. Installing rubber ring; 508. Elastic cone cover; 509. Limiting elastic rope; 510. Filling cotton block. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0045] Example: Figure 1-8 As shown, the present invention provides a technical solution, an environmentally friendly composite low-voltage power cable, comprising a central conductor 1, the outer side of the central conductor 1 is tightly coated with an insulating inner layer 2, and the outer side of the insulating inner layer 2 is tightly coated with a protective inner layer 3;

[0046] An air-liquid circulation type protection cooling mechanism 4 is arranged outside the protection inner layer 3. The air-liquid circulation type protection cooling mechanism 4 is used to actively circulate the air and liquid inside the cable, and to adjust the heat inside the cable during the air-liquid circulation process. At the same time, the hardness of the outer side of the cable is adjusted by adjusting the air-liquid pressure in the circulation, so as to achieve protection of the outer side of the cable.

[0047] The gas-liquid circulation type protective cooling mechanism 4 comprises a limiting inner layer 401, a protective braided layer 402, an isolating outer layer 403, an elastic telescopic layer 404, a protective ridge layer 405, a reinforcing thin rope 406, a sealing flexible layer 407, an elastic expansion layer 408, a diffusion groove sleeve 409, an installation annular groove 410, a connecting guide ring 411, an upper gas guide tube 412, a lower liquid guide tube 413, a liquid distribution thin tube 414, a connecting gas valve 415, a gas transmission outer tube 416, a connecting liquid valve 417, a liquid transmission outer tube 418, a thermal conductive flexible layer 419 and a protective outer layer 420;

[0048] The three protective inner layers 3 are coated with a limited inner layer 401 on the outside, the limited inner layer 401 is tightly coated with a protective braided layer 402 on the outside, the protective braided layer 402 is tightly coated with an isolation outer layer 403, the isolation outer layer 403 is uniformly coated with an elastic telescopic layer 404 on the outside, the elastic telescopic layer 404 is tightly coated with a protective ridge layer 405 on the outside, the outer convex strips of the protective ridge layer 405 are tightly interspersed with reinforcing thin cables 406, the elastic telescopic layer 404 is uniformly provided with axial grooves along the circumferential direction, and the elastic telescopic layer 404 and the protective ridge layer 405 are both made of elastic material;

[0049] The outer side of the protective ridge layer 405 is tightly coated with a sealing flexible layer 407, and the outer side of the sealing flexible layer 407 is evenly provided with an elastic expansion layer 408. The inner circle of the sealing flexible layer 407 is tightly coated and fitted with the outer side of the protective ridge layer 405, and a gap is left between the outer side of the sealing flexible layer 407 and the inner side of the elastic expansion layer 408, and both the sealing flexible layer 407 and the elastic expansion layer 408 can be elastically expanded and contracted;

[0050] The elastic expansion layer 408 is tightly coated with a diffusion groove sleeve 409 on the outside, and an installation annular groove 410 is evenly and equidistantly opened on the outside of the diffusion groove sleeve 409 along the axial direction. A connecting guide ring 411 is symmetrically clamped inside the installing annular groove 410, and an upper air guide tube 412 is fixedly installed on the top of one side of the connecting guide ring 411, and a lower liquid guide tube 413 is fixedly installed on the bottom of one side of the connecting guide ring 411. A liquid distribution tube 414 is evenly and fixedly connected to the inner position of the elastic expansion layer 408 at the inner circle of the connecting guide ring 411 along the circumferential direction. The outer side of the liquid distribution tube 414 is tightly fitted with the inner wall of the groove of the sealing flexible layer 407, and the end of the liquid distribution tube 414 is connected to the inner cavity of the connecting guide ring 411.

[0051] The end of the gas guide upper tube 412 is connected to a connecting gas valve 415 through a threaded tube, and the ends of multiple connecting gas valves 415 are commonly fixedly connected to a gas transmission outer tube 416. The end of the liquid guide lower tube 413 is connected to a connecting liquid valve 417 through a threaded tube, and the ends of multiple connecting liquid valves 417 are fixedly connected to a liquid transmission outer tube 418 through pipelines. The end of the gas transmission outer tube 416 is connected to an external gas supply pipeline, and the end of the liquid transmission outer tube 418 is connected to an external liquid transmission pipeline.

[0052] The outer side of the diffusion slot sleeve 409 is coated with a heat-conducting flexible layer 419 at a position corresponding to the side of the connecting guide ring 411, and the outer side of the heat-conducting flexible layer 419 is coated with a protective outer layer 420 at a position corresponding to the side of the connecting guide ring 411. The outer side of the diffusion slot sleeve 409 is evenly and evenly provided with expansion grooves in the axial and circumferential directions. The heat-conducting flexible layer 419 is made of a soft elastic material, and the diffusion slot sleeve 409 can fit with the heat-conducting flexible layer 419 after expansion. The use process of the power cable is optimized through the mutual cooperation between the internal components of the gas-liquid circulation type protective cooling mechanism 4, and the gas transmission outer tube 416 and the liquid transmission outer tube 418 and the sealing flexible layer 407 and the elastic expansion layer 408. The use process of the power cable is simplified. The cavity between the sealing flexible layer 407 and the elastic expansion layer 408 can be inflated through the gas transmission outer tube 416, so that the sealing flexible layer 407 and the elastic expansion layer 408 can actively expand outward, thereby actively increasing the outer diameter of the cable, and the gas cavity formed between the sealing flexible layer 407 and the elastic expansion layer 408 effectively increases the overall flexibility of the cable, so that the outer side of the cable can be elastically deformed by slight external compression, and can be promptly restored after the pressure is removed, thereby effectively avoiding the external compression directly causing deformation and displacement of the internal conductor of the cable to affect the normal use of the cable, thereby effectively improving the stability of the use of the power cable;

[0053] When auxiliary heat dissipation of the outer side of the cable is required, the circulating liquid can be continuously supplied to the inner cavity of the sealing flexible layer 407 and the elastic expansion layer 408 through the infusion outer tube 418, and continuous heat exchange is performed with the inside of the cable during the flow of the circulating liquid, and the heat inside the cable is quickly removed during the flow of the circulating liquid, thereby effectively accelerating the heat dissipation efficiency of the outer side of the cable. At the same time, by strengthening the pressure between the inner cavity of the sealing flexible layer 407 and the elastic expansion layer 408, the outer side of the cable is protected by high-pressure circulating liquid, thereby effectively improving the protection performance of the outer side of the cable;

[0054] At the same time, through the mutual cooperation between the elastic telescopic layer 404 and the protective ridge layer 405, the liquid distribution tube 414 and the sealing flexible layer 407 are assisted in positioning to prevent the sealing flexible layer 407 and the liquid distribution tube 414 from being displaced during the use of the cable. At the same time, through the deformable flexible structure design of the elastic telescopic layer 404, the internal structure of the cable can have a sufficient displacement with the external structure, effectively preventing the internal structure from directly shaking when the cable is shaken and squeezed by the outside, thereby improving the stability of the internal structure of the cable. In addition, during the installation of the power cable, the gas transmission outer tube 416 and the liquid transmission outer tube 418 can be used for auxiliary fixing, thereby effectively improving the stability of the cable installation;

[0055] An internal liquid alternating expansion heat exchange mechanism 5 is provided inside the limiting inner layer 401, and the internal liquid alternating expansion heat exchange mechanism 5 is used to provide auxiliary support to the inside of the cable, and actively cool the center of the cable by driving the active circulation of the cooling liquid inside the cable;

[0056] The internal liquid alternate expansion heat exchange mechanism 5 includes a liquid guide valve 501, a liquid infusion transverse tube 502, a central liquid guide tube 503, a limit rubber strip 504, a connecting side tube 505, a telescopic support bag 506, a mounting rubber ring 507, an elastic cone cover 508, a limit elastic rope 509 and a filling cotton block 510;

[0057] The sides of the two infusion outer tubes 418 are fixedly connected with a liquid guide valve 501 through a pipeline, and the ends of the two liquid guide valves 501 are fixedly connected with a liquid transverse tube 502. The side of the liquid transverse tube 502 corresponds to the inner center of the limiting inner layer 401 and is fixedly connected with a central liquid guide tube 503. The outer side of the central liquid guide tube 503 is evenly sleeved with a limiting rubber strip 504 at an equal distance. The outer side of the central liquid guide tube 503 is evenly fixedly connected with a connecting side tube 505 along the circumferential direction and the axial direction.

[0058] The end of the connecting side tube 505 is fixedly connected to a position on one side of the limiting rubber strip 504, the outer arc surface of the limiting rubber strip 504 is tightly fitted with the outer side of the protective inner layer 3, the outer straight surface of the limiting rubber strip 504 is tightly fitted with the inner side surface of the telescopic support bag 506, the infusion transverse tube 502 is connected with the central catheter 503 and the infusion outer tube 418, the connecting side tube 505 runs through the middle of the limiting rubber strip 504, and the end of the connecting side tube 505 is connected with the inner cavity of the telescopic support bag 506;

[0059] Both ends of the telescopic support bag 506 are bonded with mounting rubber rings 507, and the ends of the mounting rubber rings 507 are bonded with elastic cone covers 508. The ends of the elastic cone covers 508 are fixedly connected to the limiting elastic ropes 509. Both ends of the telescopic support bag 506 are filled with filling cotton blocks 510. The ends of the limiting elastic ropes 509 are fixedly connected to the ends of the telescopic support bag 506. The interior of the chamber composed of the telescopic support bag 506 and the elastic cone cover 508 is filled with coolant. Through the mutual cooperation between the components inside the heat exchange mechanism 5 through the alternating expansion of the internal liquid, the installation and use process of the cable is optimized. The limiting rubber strip 504 and the components connected thereto can be installed inside the limiting inner layer 401 through the central liquid guide tube 503, and the inside of the telescopic support bag 506 can be alternately filled with liquid through the infusion outer tube 418 in cooperation with the central liquid guide tube 503, so that the inside of the cable can be quickly heat-exchanged through the alternating flow of the circulating liquid inside the telescopic support bag 506, and the flow efficiency of the circulating liquid inside the cable can be accelerated through the mutual cooperation between the elastic cone cover 508 and the limiting elastic rope 509, so as to realize rapid cooling and heat dissipation from the middle of the cable, thereby effectively improving the cooling and heat dissipation efficiency of the cable;

[0060] At the same time, the gaps between the protective inner layers 3 are filled by the telescopic support bag 506 and the filling cotton block 510, and the internal pressure of the telescopic support bag 506 is adjusted by the liquid guide valve 501 and the infusion cross tube 502. The pressure inside the telescopic support bag 506 is increased to increase the overall hardness of the telescopic support bag 506, and then the protective inner layer 3 is supported and limited by the limiting rubber strip 504 and the telescopic support bag 506, which effectively prevents the central conductor 1 from shaking during the cable installation process, thereby effectively improving the stability of the cable installation.

[0061] Working principle and use process of the present invention: During the use of the cable, the present invention conducts the current inside the cable through the central conductor 1, and protects the outer side of the central conductor 1 through the insulating inner layer 2 and the protective inner layer 3, bundles multiple strands of central conductors 1 together through the limiting inner layer 401, and then covers and strengthens the outer side of the limiting inner layer 401 through the protective braided layer 402 to maintain the stability of the overall internal structure of the power cable, and protects the outer side of the protective braided layer 402 through the isolating outer layer 403, so as to isolate the inside and outside of the cable, so as to reduce the influence of external changes on the inside of the cable;

[0062] The protective rib layer 405 is wrapped inside the isolation outer layer 403 through the elastic expansion layer 404, and the inner part of the cable is supplemented by the undulating structure on the outer side of the protective rib layer 405, and the outer side of the protective rib layer 405 is reinforced by the reinforcing thin rope 406. Then, the protective rib layer 405 can be elastically deformed to provide buffering after being squeezed by the flexible design of the sealing flexible layer 407;

[0063] At the same time, through the mutual cooperation between the sealing flexible layer 407 and the elastic expansion layer 408, an independent protective chamber is formed on the outside of the cable, and the outside of the elastic expansion layer 408 is strengthened by the diffusion groove sleeve 409, and then the connecting guide ring 411 is installed to the outside of the diffusion groove sleeve 409 by installing the annular groove 410. When it is necessary to strengthen the flexibility and elasticity of the outer side of the cable, the connecting liquid valve 417 is closed and the connecting gas valve 415 is opened at the same time, and then the gas transmission outer pipe 416 is started to supply gas to the inside of the connecting guide ring 411 through the gas guide upper pipe 412, and then the inside of the connecting guide ring 411 is connected through the liquid distribution tube 414. The inert gas is introduced into the cavity formed by the sealing flexible layer 407 and the elastic expansion layer 408. When the air intake of the cavity formed by the sealing flexible layer 407 and the elastic expansion layer 408 is greater than the air discharge, the pressure inside the cavity will continue to increase and expand outwards, and in the process of the diffusion slot sleeve 409 expanding outwards, the outer groove will continue to expand. At the same time, by utilizing the flexible and easy-to-deform property of the thermal conductive flexible layer 419 and the elastic contraction property of the protective outer layer 420, the thermal conductive flexible layer 419 can fill the groove outside the diffusion slot sleeve 409 after elastic deformation, so as to maintain good thermal conductivity after the outer ring of the cable expands;

[0064] When it is necessary to strengthen the pressure resistance of the outer side of the cable and assist the heat dissipation of the cable, close the connecting air valve 415 and open the connecting liquid valve 417, then continuously supply the circulating liquid through the infusion outer tube 418, and introduce the circulating liquid into the corresponding connecting guide ring 411 through the liquid guide lower tube 413, and introduce the circulating liquid into the cavity formed by the sealing flexible layer 407 and the elastic expansion layer 408 through the liquid distribution capillary 414, and then form an independent flow protection layer on the outer side of the cable through the circulating liquid between the sealing flexible layer 407 and the elastic expansion layer 408, and then strengthen the overall protection performance of the outer side of the cable through the circulating liquid, and in the process of the circulating liquid continuously flowing along the inside of the cable, the flowing circulating liquid can continuously exchange heat with the inside of the cable, thereby realizing the cooling and heat dissipation of the inside of the cable;

[0065] When it is necessary to provide limited support inside the cable, after opening the liquid guide valve 501, the circulating liquid inside the infusion outer tube 418 can be introduced into the central liquid guide tube 503 through the infusion transverse tube 502, and then the telescopic support bag 506 is installed to the outside of the central liquid guide tube 503 through the connecting side tube 505, and the outer side of the protective inner layer 3 is limited and supported by the limited rubber strip 504, and the inner side of the telescopic support bag 506 is limited and supported by the limited rubber strip 504, so that the installation and connection of the telescopic support bag 506 is more stable;

[0066] The circulating fluid inside the central liquid guide tube 503 can be introduced into the telescopic support bag 506 by connecting the side tube 505. As the circulating fluid in the middle of the telescopic support bag 506 increases, the elastic cone cover 508 at the end of the rubber ring 507 can be driven to expand toward both ends, thereby driving the telescopic support bag 506 as a whole to expand axially along the side gap of the protective inner layer 3. The expansion of the telescopic support bag 506 increases the contact area between the outer side of the telescopic support bag 506 and the outer side of the protective inner layer 3, thereby increasing the heat exchange efficiency between the circulating fluid inside the telescopic support bag 506 and the central conductor 1, thereby achieving cooling of the inside of the cable through the alternating flow of the circulating fluid inside the telescopic support bag 506, and the end of the elastic cone cover 508 is pulled and limited by the limiting elastic rope 509 to ensure that the elastic cone cover 508 can smoothly perform elastic deformation, and the filling cotton block 510 is used to provide auxiliary support for the internal shape of the telescopic support bag 506 to maintain the overall shape of the telescopic support bag 506, and the pressure inside the telescopic support bag 506 is increased to increase the overall hardness of the telescopic support bag 506, thereby increasing the overall structural strength of the cable.

[0067] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An environmentally friendly composite low-voltage power cable, comprising a central conductor (1), characterized in that: The outer side of the central conductor (1) is tightly coated with an insulating inner layer (2), and the outer side of the insulating inner layer (2) is tightly coated with a protective inner layer (3); An air-liquid circulation type protective cooling mechanism (4) is arranged outside the protective inner layer (3), and the air-liquid circulation type protective cooling mechanism (4) is used to actively circulate the air and liquid inside the cable, and to adjust the heat inside the cable during the air-liquid circulation process, and at the same time, to adjust the hardness of the outer side of the cable by adjusting the air-liquid pressure in the circulation, so as to achieve protection of the outer side of the cable; The gas-liquid circulation type protective cooling mechanism (4) comprises a limiting inner layer (401); The three protective inner layers (3) are coated with a limited inner layer (401) on their outer sides; the limited inner layer (401) is tightly coated with a protective braided layer (402) on its outer side; the protective braided layer (402) is tightly coated with an isolation outer layer (403); the isolation outer layer (403) is uniformly coated with an elastic telescopic layer (404) on its outer side; the elastic telescopic layer (404) is tightly coated with a protective ridge layer (405); and reinforcing thin cords (406) are tightly inserted into the outer convex strips of the protective ridge layer (405); The outer side of the protective ridge layer (405) is tightly coated with a sealing flexible layer (407), the outer side of the sealing flexible layer (407) is evenly provided with an elastic expansion layer (408), the outer side of the elastic expansion layer (408) is tightly coated with a diffusion groove sleeve (409), the outer side of the diffusion groove sleeve (409) is evenly and equidistantly provided with mounting annular grooves (410) along the axial direction, the mounting annular groove (410) is symmetrically clamped with a connecting guide ring (411) inside, an upper air guide tube (412) is fixedly installed on the top of one side of the connecting guide ring (411), a lower liquid guide tube (413) is fixedly installed on the bottom of one side of the connecting guide ring (411), and a liquid distribution thin tube (414) is evenly and fixedly connected to the inner position of the inner circle of the connecting guide ring (411) corresponding to the elastic expansion layer (408) along the circumferential direction; The end of the gas guide upper tube (412) is connected to a connecting gas valve (415) via a threaded tube, and the ends of a plurality of connecting gas valves (415) are fixedly connected to a gas transmission outer tube (416); the end of the liquid guide lower tube (413) is connected to a connecting liquid valve (417) via a threaded tube, and the ends of a plurality of connecting liquid valves (417) are fixedly connected to a liquid transmission outer tube (418) via a pipeline; The outer side of the diffusion slot sleeve (409) is coated with a heat-conducting flexible layer (419) at a position corresponding to the side of the connecting guide ring (411), and the outer side of the heat-conducting flexible layer (419) is coated with a protective outer layer (420) at a position corresponding to the side of the connecting guide ring (411).

2. An environmentally friendly composite low-voltage power cable according to claim 1, characterized in that: Axial grooves are evenly arranged inside the elastic telescopic layer (404) along the circumferential direction, and the elastic telescopic layer (404) and the protective ridge layer (405) are both made of elastic material.

3. The environmentally friendly composite low-voltage power cable according to claim 1, characterized in that: The inner circle of the sealing flexible layer (407) is tightly wrapped and fitted with the outer side of the protective ridge layer (405), a gap is left between the outer side of the sealing flexible layer (407) and the inner side of the elastic expansion layer (408), and both the sealing flexible layer (407) and the elastic expansion layer (408) can be elastically expanded and contracted.

4. The environmentally friendly composite low-voltage power cable according to claim 1, characterized in that: The outer side of the diffusion slot sleeve (409) is provided with expansion slots evenly spaced in the axial and circumferential directions; the thermally conductive flexible layer (419) is made of a soft elastic material; and the diffusion slot sleeve (409) can fit with the thermally conductive flexible layer (419) after expansion.

5. The environmentally friendly composite low-voltage power cable according to claim 1, characterized in that: The outer side of the liquid distributing tube (414) is tightly fitted to the inner wall of the groove of the sealing flexible layer (407), and the end of the liquid distributing tube (414) is connected to the inner cavity of the connecting guide ring (411).

6. The environmentally friendly composite low-voltage power cable according to claim 1, characterized in that: The end of the gas transmission outer tube (416) is in communication with an external gas supply pipeline, and the end of the liquid transmission outer tube (418) is in communication with an external liquid transmission pipeline.

7. The environmentally friendly composite low-voltage power cable according to claim 1, characterized in that: An internal liquid alternating expansion heat exchange mechanism (5) is provided inside the limiting inner layer (401), and the internal liquid alternating expansion heat exchange mechanism (5) is used to provide auxiliary support to the inside of the cable and to actively cool the center of the cable by driving the active circulation of the cooling liquid inside the cable; The internal liquid alternating expansion heat exchange mechanism (5) comprises a liquid guide valve (501); The sides of the two infusion outer tubes (418) are fixedly connected with a liquid guide valve (501) through a pipeline, and the ends of the two liquid guide valves (501) are fixedly connected with an infusion transverse tube (502). The side of the infusion transverse tube (502) corresponds to the center of the inner limit layer (401) and is fixedly connected with a central liquid guide tube (503). The outer side of the central liquid guide tube (503) is evenly sleeved with a limit rubber strip (504) at equal intervals, and the outer side of the central liquid guide tube (503) is evenly and fixedly connected with a connecting side tube (505) at equal intervals in the circumferential direction and in the axial direction; A telescopic support bag (506) is fixedly connected to the end of the connecting side tube (505) at a position corresponding to one side of the limiting rubber strip (504), and mounting rubber rings (507) are bonded to both ends of the inside of the telescopic support bag (506), and an elastic cone cover (508) is bonded to the end of the mounting rubber ring (507), and a limiting elastic rope (509) is fixedly connected to the end of the elastic cone cover (508), and filling cotton blocks (510) are filled to both ends of the inside of the telescopic support bag (506).

8. An environmentally friendly composite low-voltage power cable according to claim 7, characterized in that: The transverse infusion tube (502) is interconnected with the central infusion tube (503) and the external infusion tube (418); the connecting side tube (505) passes through the middle of the limiting rubber strip (504); and the end of the connecting side tube (505) is interconnected with the inner cavity of the telescopic support bag (506).

9. The environmentally friendly composite low-voltage power cable according to claim 7, characterized in that: The outer curved surface of the limiting rubber strip (504) is tightly fitted to the outer side of the protective inner layer (3), and the outer straight surface of the limiting rubber strip (504) is tightly fitted to the inner side surface of the telescopic support bag (506).

10. The environmentally friendly composite low-voltage power cable according to claim 7, characterized in that: The end of the position-limiting elastic rope (509) is fixedly connected to the end of the telescopic support bag (506), and the interior of the chamber formed by the telescopic support bag (506) and the elastic cone cover (508) is filled with cooling liquid.

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