Low-smoke halogen-free flame-retardant fireproof power cable
By combining flexible heat insulation sheets, heat dissipation grooves, and internal heat exchange mechanisms, the problem of heat dissipation inside the cable is solved, achieving efficient heat dissipation and improved heat resistance, and reducing the risk of cable failure.
Patent Information
- Application Number
- CN202511908777.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-17
- Publication Date
- 2026-03-03
AI Technical Summary
Existing cables have difficulty dissipating internal heat under high voltage current, leading to increased risks of cable failure and spontaneous combustion. Traditional flame-retardant methods hinder heat dissipation.
It employs flexible heat insulation sheets, heat dissipation channels, heat dissipation protection mechanisms, and internal heat exchange mechanisms. The flexible heat insulation sheets block heat, the heat dissipation channels accelerate heat diffusion, the heat dissipation protection mechanisms improve protection, and the internal heat exchange mechanisms enable airflow to directly remove heat.
It effectively reduces heat accumulation inside the cable, improves heat dissipation efficiency, enhances the cable's heat resistance and protection, and prevents cable failure and spontaneous combustion.
Smart Images
Figure CN121601330A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power cable technology, specifically to a low-smoke, halogen-free, flame-retardant, and fire-resistant power cable. Background Technology
[0002] Nowadays, most cables use low-smoke halogen-free cross-linked polyethylene (XLPE) for insulation. XLPE has advantages such as good insulation, low melting point, and easy molding. However, when some equipment needs to transmit high voltage and current, the internal conductors of the cable will generate a lot of heat during operation. Due to the difficulty in dissipating the heat inside the cable through the insulation layer, and the poor heat resistance of XLPE, the high temperature inside the cable cannot be dissipated for a long time, which may lead to cable failure.
[0003] Many large pieces of equipment that use high-voltage current are located in environments with high temperatures. Traditional flame-retardant methods often involve setting flame-retardant tape on the cable, or installing fireproof cable trays or firewalls. However, while these methods block external heat, they also hinder the heat dissipation of the conductor inside the cable. With the cable also having a high internal temperature, the heat is difficult to dissipate, which may lead to spontaneous combustion, short circuits, and other problems. Summary of the Invention
[0004] This invention proposes a low-smoke, halogen-free, flame-retardant, and fire-resistant power cable to solve the problem in existing technologies where heat inside the cable is difficult to dissipate quickly within the insulation layer.
[0005] The technical solution of the present invention is as follows: A low-smoke, halogen-free, flame-retardant, and fire-resistant power cable includes an insulation layer, conductor cores, and filler. Multiple conductor cores are twisted together, and the conductor cores and filler are encased within the insulation layer. The cable also includes flexible heat insulation sheets, heat dissipation grooves, a heat dissipation protection mechanism, a locking connector, and an internal heat exchange mechanism. Multiple flexible heat insulation sheets are respectively wrapped around multiple conductor cores, with each flexible heat insulation sheet positioned between adjacent conductor cores. The openings of the flexible heat insulation sheets wrapped around the conductor cores face the insulation layer. Multiple heat dissipation grooves are circumferentially formed on the insulation layer. Near the conductor core, a heat dissipation and protection mechanism is detachably attached to the insulation layer. The heat dissipation and protection mechanism is connected to the heat dissipation groove and is used to protect the insulation layer while dissipating heat from the conductor core. A locking connector is fixedly connected to the insulation layer and the heat dissipation and protection mechanism. Multiple conductor cores pass through the locking connector. An internal heat exchange mechanism is disposed in the filling material and is fixedly connected to the locking connector. Multiple conductor cores are arranged around the internal heat exchange mechanism, which is used to dissipate heat from the interior of the insulation layer.
[0006] The opening of the flexible heat insulation sheet faces the heat dissipation groove. The flexible heat insulation sheet is used to block heat between adjacent conductor cores. The conductor cores can dissipate heat through the heat dissipation groove and the heat dissipation protection mechanism.
[0007] The heat dissipation and protection mechanism includes supporting torsion bars, concave guard strips, tightening grooves, and tightening straps. Multiple supporting torsion bars are circumferentially arranged and fixedly connected to the insulating layer. The multiple supporting torsion bars and multiple heat dissipation grooves are interlaced and twisted on the insulating layer. The supporting torsion bars are protruding. Multiple concave guard strips are detachably installed in the heat dissipation grooves. The two sides of each concave guard strip are in contact with the adjacent supporting torsion bars. Multiple tightening grooves are equally spaced on the supporting torsion bars and the concave guard strips. The tightening grooves on the supporting torsion bars and the concave guard strips are aligned. Multiple tightening straps are detachably installed on the tightening grooves. The tightening straps are sleeved on the supporting torsion bars and the concave guard strips.
[0008] The concave protective strip is made of wear-resistant material, and the heat of the conductor core is dissipated through the heat dissipation groove and the concave protective strip.
[0009] The internal heat exchange mechanism includes a heat dissipation pipe, a flow guide frame, and ventilation channels. The heat dissipation pipe is fixedly disposed in the filling material and is located in the center of multiple conductor cores. The heat dissipation pipe is fixedly connected to the locking joint. The flow guide frame is fixedly connected to the locking joint on the side away from the insulation layer. Multiple conductor cores pass through the flow guide frame. The heat dissipation pipe is connected to the flow guide frame. Multiple ventilation channels are arranged circumferentially on the flow guide frame and are connected to the heat dissipation pipe.
[0010] The portion of the heat dissipation pipe within the filling material has multiple heat exchange holes arranged in a circular pattern. An active ventilation port is provided on the side of the flow guide frame away from the locking joint, and the active ventilation port is connected to the heat dissipation pipe.
[0011] The ventilation channel is arc-shaped and is connected to the side of the guide frame. Both ends of the heat dissipation pipe are connected to the active ventilation port, and a baffle is detachably installed on the active ventilation port.
[0012] Both ends of the cable are provided with the locking connector and the flow guide frame, and the ventilation channels in the two flow guide frames are bent in opposite directions.
[0013] The working principle and beneficial effects of this invention are as follows: 1. In this invention, a flexible heat insulation sheet is provided. The flexible heat insulation sheet is wrapped around the conductor core in the direction close to the inside of the cable to block the heat dissipation of the conductor core, reduce the heat transferred to the inside of the cable, and the opening of the flexible heat insulation sheet faces the direction of the insulation layer, so that the heat of the conductor core can diffuse to the outside through the insulation layer, reducing the difficulty of cooling the heat accumulated inside the cable. 2. In this invention, heat dissipation grooves are set on the insulation layer near the conductor core. By reducing the thickness of the insulation layer, the heat dissipation speed of the conductor core is accelerated. At the same time, the opening of the flexible heat insulation sheet faces the heat dissipation grooves, so that the heat of the conductor core is concentrated and quickly transferred to the air through the heat dissipation grooves, avoiding the accumulation of heat inside the insulation layer. 3. In this invention, by setting a heat dissipation and protection mechanism around the outside of the insulation layer, the protection and wear resistance of the cable insulation layer are improved, and the thin insulation layer at the heat dissipation groove is easily damaged. On the other hand, the heat dissipation efficiency of the heat dissipation groove is maximized. By setting an internal heat exchange mechanism, external airflow can be directly introduced into the inside of the cable. The airflow carries the heat inside the filling material directly away from the outside air, thereby further improving the heat resistance of the cable by accelerating the heat dissipation speed inside the cable. Attached Figure Description
[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure from another perspective in this invention; Figure 3 This is a partial internal cross-sectional view of the structure in which the insulation layer, conductor core, and flexible heat insulation sheet cooperate in this invention. Figure 4 This is a partial internal cross-sectional view of the insulation layer, conductor core, and flexible heat insulation sheet in this invention from another perspective. Figure 5 This is a partial internal cross-sectional view of the flow guide frame and locking connector in this invention. Figure 6 This is a partial internal cross-sectional view of the flow guide frame in this invention.
[0016] In the diagram: 1. Insulation layer; 2. Conductor core; 3. Filler; 4. Flexible heat insulation sheet; 5. Heat dissipation groove; 6. Locking joint; 7. Supporting torsion strip; 8. Concave guard strip; 9. Tightening groove; 10. Tightening band; 11. Heat dissipation pipe; 12. Guide frame; 13. Air exchange channel; 14. Heat exchange hole; 15. Active air exchange port; 16. Baffle. Detailed Implementation
[0017] 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.
[0018] like Figures 1-6 As shown, this embodiment proposes a low-smoke, halogen-free, flame-retardant, and fire-resistant power cable, including an insulation layer 1, conductor cores 2, and filler 3. Multiple conductor cores 2 are twisted together, and the conductor cores 2 and filler 3 are wrapped within the insulation layer 1. The cable also includes flexible heat insulation sheets 4, heat dissipation grooves 5, a heat dissipation protection mechanism, a locking connector 6, and an internal heat exchange mechanism. Multiple flexible heat insulation sheets 4 are respectively wrapped around multiple conductor cores 2, with flexible heat insulation sheets 4 positioned between adjacent conductor cores 2. The openings of the flexible heat insulation sheets 4 on the conductor cores 2 face towards the insulation layer 1. Multiple heat dissipation grooves 5 are circumferentially formed on the insulation layer 1, positioned near the conductor cores 2. The heat dissipation protection mechanism is detachably attached to the insulation layer 1 and connected to the heat dissipation grooves 5. The heat dissipation protection mechanism is used to dissipate heat from the conductor cores 2 while protecting the insulation layer 1. The locking connector 6 is fixedly connected to the insulation layer 1 and the heat dissipation protection mechanism, with multiple conductor cores 2 passing through the locking connector 6. The internal heat exchange mechanism... The internal heat exchange mechanism is fixedly connected to the locking joint 6 within the filling material 3. Multiple conductor cores 2 are arranged around the internal heat exchange mechanism, which is used to dissipate heat from the inside of the insulation layer 1. In this application, the multiple conductor cores 2 are separated by a flexible heat insulation sheet 4 to prevent the heat from the conductor cores 2 from being transferred to the inside of the insulation layer 1 and to prevent a large amount of heat from accumulating inside the cable. By opening heat dissipation grooves 5, the insulation layer 1 is made thinner near the conductor cores 2, making it easier for the heat from the conductor cores 2 to be dissipated through the heat dissipation grooves 5. At the same time, the heat dissipation protection mechanism is used to improve the protection of the cable and prevent the insulation layer 1 from being too thin and having low mechanical hardness due to the heat dissipation grooves 5. Through the internal heat exchange mechanism set inside the insulation layer 1, the heat from the multiple conductor cores 2 accumulating inside the insulation layer 1 through the flexible heat insulation sheet 4 can be directly diffused to the external environment. The heat dissipation protection mechanism is locked and fixed by the locking joint 6, and the cable break is sealed to prevent dust and water from entering the filling material 3.
[0019] like Figures 1-4As shown, the opening of the flexible heat insulation sheet 4 faces the heat dissipation groove 5. The flexible heat insulation sheet 4 is used to block the heat between adjacent conductor cores 2. The conductor core 2 can dissipate heat through the heat dissipation groove 5 and the heat dissipation protection mechanism. In this embodiment, four conductor cores 2 are provided. The flexible heat insulation sheet 4 is set in a long strip flat shape. The flexible heat insulation sheet 4 wraps around the conductor core 2 on the side near the heat dissipation pipe 11. The flexible heat insulation sheet 4 can wrap the conductor core 2 except for the position near the heat dissipation groove 5, so that only part of the heat of the conductor core 2 during operation can be transferred to the inside of the cable through the flexible heat insulation sheet 4, avoiding the accumulation of a large amount of heat inside the cable.
[0020] like Figures 1-4 As shown, the heat dissipation protection mechanism includes supporting torsion bars 7, concave guard strips 8, tightening grooves 9, and tightening straps 10. Multiple supporting torsion bars 7 are circumferentially arranged and fixedly connected to the insulation layer 1. These bars are interlaced and twisted with multiple heat dissipation grooves 5 on the insulation layer 1. The supporting torsion bars 7 are protruding. Multiple concave guard strips 8 are detachably installed in the heat dissipation grooves 5, with their sides contacting adjacent supporting torsion bars 7. Multiple tightening grooves 9 are equally spaced on the supporting torsion bars 7 and concave guard strips 8, aligning with each other. Multiple tightening straps 10 are detachably installed on the tightening grooves 9, and are fitted onto the supporting torsion bars 7 and concave guard strips 8. The concave guard strips 8 are made of wear-resistant material. The heat of conductor 2 is dissipated through heat dissipation grooves 5 and concave protective strips 8. The concave protective strips 8 are made of a material with high thermal conductivity. The concave protective strips 8 are set in the heat dissipation grooves 5. On the one hand, the thickness of the insulation layer 1 is reduced due to the opening of the heat dissipation grooves 5, which increases the mechanical hardness of the cable exterior. On the other hand, due to the reduced thickness of the insulation layer 1, the heat on conductor 2 can be diffused more quickly through the heat dissipation grooves 5. While providing mechanical hardness, the concave protective strips 8 minimize the impact on heat dissipation in the heat dissipation grooves 5, thereby improving the heat dissipation efficiency of conductor 2 and thus improving heat resistance. Supporting torsion strips 7 are set to enhance the squeezing and clamping effect on the concave protective strips 8. The concave protective strips 8 are tightened by opening tightening grooves 9 and tightening bands 10 to prevent the concave protective strips 8 from separating from the heat dissipation grooves 5.
[0021] like Figures 1-5As shown, the internal heat exchange mechanism includes a heat dissipation pipe 11, a flow guide frame 12, and ventilation channels 13. The heat dissipation pipe 11 is fixedly disposed in the filling material 3 and is located in the center of multiple wire cores 2. The heat dissipation pipe 11 is fixedly connected to the locking joint 6. The flow guide frame 12 is fixedly connected to the side of the locking joint 6 away from the insulation layer 1. Multiple wire cores 2 pass through the flow guide frame 12, and the heat dissipation pipe 11 is connected to the flow guide frame 12. Multiple ventilation channels 13 are arranged circumferentially on the flow guide frame 12 and are connected to the heat dissipation pipe 11. In this embodiment, four wire cores 2 and four flexible heat insulation sheets 4 are provided, and four ventilation channels 13 are provided on each locking joint 6. The ventilation channel 13 is placed in the gap between adjacent conductor cores 2. The purpose of the ventilation channel 13 is to connect the heat exchange pipe 11 with the outside. The heat exchange channel has a large opening on the side of the guide frame 12. When the outside air flows, it can enter the heat exchange pipe 11. Or when the airflow passes through the opening of the heat exchange channel, due to Bernoulli's principle, part of the airflow inside the heat exchange pipe 11 can be driven outward, so as to diffuse the heat in the heat exchange pipe 11 to the outside. The heat exchange holes 14 on the heat exchange pipe 11 can also dissipate the heat on the filling material 3 more directly. At the same time, in this embodiment, the conductor cores 2 are all covered with an insulating outer sheath. When the external water vapor enters the filling material 3, it will not cause the two cables to short circuit.
[0022] like Figures 3-6 As shown, the portion of the heat exchange pipe 11 within the filler 3 has multiple heat exchange holes 14 arranged in a circular pattern. The guide frame 12 has an active ventilation port 15 on the side away from the locking connector 6. The active ventilation port 15 is connected to the heat exchange pipe 11. The heat exchange pipe 11 is made of a soft tube. The heat dissipated by the conductor core 2 is transferred to the interior of the insulation layer 1 through the flexible heat insulation sheet 4. The heat exchange pipe 11 accumulates heat in the center of the filler 3. After removing the baffle 16 on the active ventilation port 15, ventilation is provided at the active ventilation port 15 by means of a fan or other equipment. The airflow enters at one end of the heat exchange pipe 11 and leaves at the other end. When the airflow flows, it dissipates heat from the filler 3 through the heat exchange holes 14, thereby actively diffusing the heat inside the insulation layer 1.
[0023] The cable proposed in this application is mainly used in scenarios where it provides energy to large equipment. The cable length is usually relatively short. When it is necessary to dissipate heat from the inside of the cable, the heat dissipation can be actively carried out through the active ventilation port 15. While the heat dissipation groove 5 dissipates heat from the outside, the heat dissipation pipe 11 dissipates heat from the inside of the insulation layer 1, thereby dissipating heat from both the inside and outside of the cable. The filling material 3, insulation layer 1 and concave protective strip 8 are clamped by the locking joint 6 to prevent them from loosening, and the heat dissipation pipe 11 is fixed at the same time. When the temperature of the external environment is high, the cable can dissipate heat directly from the inside, and the conductor core 2 can more directly diffuse heat into the environment, thereby improving the heat dissipation capacity and heat resistance of the cable.
[0024] like Figures 3-6 As shown, the ventilation channel 13 is arc-shaped and is connected to the side of the guide frame 12. Both ends of the heat dissipation pipe 11 are connected to the active ventilation port 15. A baffle 16 is detachably installed on the active ventilation port 15. Locking connectors 6 and guide frames 12 are installed at both ends of the cable. The ventilation channels 13 in the two guide frames 12 have opposite bending directions. The arc shape of the ventilation channel 13 is designed so that when the airflow flows along the surface of the guide frame 12, the airflow direction can enter the ventilation channel 13. At time 3, the air can enter the heat dissipation pipe 11 through the ventilation channel 13. When the airflow direction is difficult to enter the ventilation channel 13, the airflow in the ventilation channel 13 can be driven to flow to the outside through Bernoulli's principle. The two guide frames 12 are set in opposite directions, so that when the airflow passes through the ventilation channel 13 on the two guide frames 12, the airflow flows in the forward and reverse directions respectively, so that air enters at one end and exits at the other end. At the same time, when the gas flow speed in the environment is weak, air can be exchanged through the active ventilation port 15.
[0025] In this embodiment, when the cable transmits high-voltage current, the conductor core 2 will generate a large amount of heat. The flexible heat insulation sheet 4 makes it difficult for the heat of the conductor core 2 to diffuse into the cable. The heat diffuses to the outside air through the heat dissipation groove 5 and the concave protective strip 8. The tightening band 10 is fixed at the tightening groove 9 to tighten and fix the concave protective strip 8. When the airflow near the cable flows, when it passes through the opening of the ventilation channel 13 on the guide frame 12, some gas can enter the ventilation channel 13 and then enter the heat dissipation pipe 11. When the airflow in the same direction passes through the ventilation channel 13 with the opposite opening direction, the suction generated by Bernoulli's principle can draw out the airflow in the heat dissipation pipe 11, thereby achieving passive ventilation in the heat dissipation pipe 11. Alternatively, gas can be sent into the active ventilation port 15 for heat exchange by opening the baffle 16.
[0026] 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 low-smoke, halogen-free, flame-retardant, and fire-resistant power cable, comprising an insulation layer (1), conductor cores (2), and filler (3), wherein a plurality of said conductor cores (2) are twisted together, and the plurality of said conductor cores (2) and the filler (3) are wrapped in the insulation layer (1), characterized in that, Also includes: Multiple flexible heat insulation sheets (4) are respectively wrapped around multiple conductor cores (2), and the flexible heat insulation sheets (4) are provided between adjacent conductor cores (2). The openings of the flexible heat insulation sheets (4) wrapped around the conductor cores (2) face the direction of the insulation layer (1). Multiple heat dissipation grooves (5) are formed in a circular pattern on the insulating layer (1), and the heat dissipation grooves (5) are located on the insulating layer (1) near the conductor core (2); The heat dissipation protection mechanism is detachable from the insulation layer (1). The heat dissipation protection mechanism is connected to the heat dissipation groove (5). The heat dissipation protection mechanism is used to dissipate heat from the conductor core (2) while protecting the insulation layer (1). The locking connector (6) is fixedly connected to the insulation layer (1) and the heat dissipation protection mechanism, and multiple conductor cores (2) pass through the locking connector (6). An internal heat exchange mechanism is disposed in the filler (3). The internal heat exchange mechanism is fixedly connected to the locking joint (6). A plurality of the conductor cores (2) are arranged around the internal heat exchange mechanism. The internal heat exchange mechanism is used to dissipate heat inside the insulation layer (1).
2. The low-smoke halogen-free flame-retardant and fire-resistant power cable according to claim 1, characterized in that, The opening of the flexible heat insulation sheet (4) faces the heat dissipation groove (5). The flexible heat insulation sheet (4) is used to block the heat between adjacent conductor cores (2). The conductor cores (2) can dissipate heat through the heat dissipation groove (5) and the heat dissipation protection mechanism.
3. The low-smoke, halogen-free, flame-retardant, and fire-resistant power cable according to claim 2, characterized in that, The heat dissipation and protection mechanism includes: Multiple support torsion bars (7) are arranged in a circular pattern and fixedly connected to the insulating layer (1). The multiple support torsion bars (7) and the multiple heat dissipation grooves (5) are intertwined and twisted on the insulating layer (1). The support torsion bars (7) are protruding. Multiple concave guard strips (8) are detachably installed in the heat dissipation groove (5), and the two sides of the concave guard strips (8) are in contact with the adjacent support torsion strips (7); Multiple tightening grooves (9) are equally spaced on the support torsion bar (7) and the concave guard bar (8), and the tightening grooves (9) on the support torsion bar (7) and the concave guard bar (8) are aligned with each other; Multiple tightening straps (10) are detachably mounted on the tightening groove (9), and the tightening straps (10) are sleeved on the support torsion bar (7) and the concave guard bar (8).
4. The low-smoke, halogen-free, flame-retardant, and fire-resistant power cable according to claim 3, characterized in that, The concave guard strip (8) is made of wear-resistant material, and the heat of the conductor core (2) is dissipated through the heat dissipation groove (5) and the concave guard strip (8).
5. A low-smoke, halogen-free, flame-retardant, and fire-resistant power cable according to claim 4, characterized in that, The internal heat exchange mechanism includes: A heat dissipation tube (11) is fixedly disposed in the filler (3). The heat dissipation tube (11) is disposed in the center of a plurality of conductor cores (2). The heat dissipation tube (11) is fixedly connected to the locking connector (6). The flow guide frame (12) is fixedly connected to the locking connector (6) on the side away from the insulation layer (1), and multiple conductor cores (2) pass through the flow guide frame (12). The heat dissipation pipe (11) is connected to the flow guide frame (12). Multiple ventilation channels (13) are arranged in a circle on the guide frame (12), and the ventilation channels (13) are connected to the heat dissipation pipe (11).
6. The low-smoke halogen-free flame-retardant and fire-resistant power cable according to claim 5, characterized in that, The portion of the heat dissipation pipe (11) located in the filler (3) has multiple heat exchange holes (14) arranged in a circular pattern. The guide frame (12) has an active ventilation port (15) on the side away from the locking connector (6), and the active ventilation port (15) is connected to the heat dissipation pipe (11).
7. A low-smoke, halogen-free, flame-retardant, and fire-resistant power cable according to claim 6, characterized in that, The ventilation channel (13) is configured as an arc shape, and the ventilation channel (13) is connected to the side of the guide frame (12).
8. A low-smoke, halogen-free, flame-retardant, and fire-resistant power cable according to claim 7, characterized in that, Both ends of the cable are provided with the locking connector (6) and the flow guide frame (12), and the ventilation channels (13) in the two flow guide frames (12) have opposite bending directions.
9. A low-smoke, halogen-free, flame-retardant, and fire-resistant power cable according to claim 7, characterized in that, The two ends of the heat dissipation pipe (11) are respectively connected to the active ventilation port (15), and a baffle (16) is detachably provided on the active ventilation port (15).