A high-safety overhead insulated cable

Abstract

This invention relates to a high-safety overhead insulated cable in the field of cables, comprising multiple outer insulation layers, with four circumferentially distributed wire cores threaded between the outer insulation layers, a support core threaded in the center of each outer insulation layer, and an optical fiber temperature sensor threaded inside the support core. A hollow protective pad is snapped between adjacent wire cores, and the hollow protective pad includes an elastic heat-conducting strip. Multiple evenly distributed support ribs are fixedly connected within the elastic heat-conducting strip, and a through hole is formed on the elastic heat-conducting strip between adjacent support ribs. Flame retardants are filled within the support ribs. Drainage holes are formed on the support ribs, and the openings of the drainage holes are sealed with a heat-melting material. Ventilation holes matching the through holes are formed on the outer insulation layers, and filter blocks are connected within the vent holes. Segmented sheaths are fixedly connected between adjacent outer insulation layers, enabling real-time monitoring and intelligent control of the cable's operating status, thus easily improving the cable's safety performance.

Description

Technical Field

[0001] The present invention relates to an overhead insulated cable, and more particularly to a high-safety overhead insulated cable for use in the field of cables. Background Technology

[0002] Existing overhead insulated cables are specifically designed for outdoor power transmission. They enhance safety and reliability by adding an insulation layer, such as polyethylene or polyvinyl chloride, to the outer layer of the conductor. These cables are commonly used for power supply in urban and suburban areas, effectively preventing short circuits caused by objects like tree branches contacting the conductor. The insulation layer of overhead insulated cables also possesses excellent weather resistance and UV resistance, enabling them to adapt to various climatic conditions. Furthermore, due to their insulation properties, overhead insulated cables can be installed closer to the ground or buildings, saving space and reducing installation costs. These cables also exhibit good mechanical strength and tensile properties, capable of withstanding certain tension and strain, ensuring long-term stable operation.

[0003] Chinese invention patent CN115910468B discloses an overhead insulated cable, relating to the field of cable technology. It includes a cable core and a first insulation layer covering the outside of the cable core. Several conductive wires are arranged outside the first insulation layer, and a second insulation layer is also provided. Several mounting boxes are arranged outside the second insulation layer. Each mounting box contains a first motor powered by the conductive wires and a winding component eccentrically connected to the motor shaft of the first motor. A snow removal component is provided between adjacent mounting boxes. This overhead insulated cable can effectively prevent snow accumulation.

[0004] Chinese invention patent CN112002482B discloses an overhead insulated cable, comprising a first cable and a second cable connected by a sleeve. Both the first and second cables contain multiple embedded tubes and a built-in triangular tube. The embedded tubes in the first cable and the embedded tubes in the second cable are interconnected by a connecting pipe. Multiple cable bodies are threaded through each of the two built-in triangular tubes. A device post is provided on the side wall of the sleeve, and the device post is fixedly connected to the side wall of the sleeve by a fixing device. This invention has a reasonable structural design and can alert inspection personnel, enabling timely detection of cable faults.

[0005] Existing overhead insulated cables often lack sufficient heat dissipation performance in high-temperature environments. This can lead to overheating during prolonged operation, affecting cable performance and even causing safety issues. Furthermore, existing overhead insulated cables have limitations in safety protection, failing to provide adequate safeguards against the risks and threats posed by overheating. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the heat dissipation performance of overhead insulated cables in the prior art is insufficient and the safety protection capability is limited in high-temperature environments.

[0007] To address the aforementioned problems, this invention provides a high-safety overhead insulated cable, comprising multiple outer insulation layers, with four circumferentially distributed wire cores threaded between the outer insulation layers. A support core is threaded through the center of each outer insulation layer, and an optical fiber temperature sensor is threaded within the support core. A hollow protective pad is snapped between adjacent wire cores. The hollow protective pad includes an elastic heat-conducting strip, within which multiple evenly distributed support ribs are fixedly connected. A through hole is formed on the elastic heat-conducting strip between adjacent support ribs, and flame retardant is filled within the support ribs. A discharge hole is formed on the support ribs, and the opening of the discharge hole is sealed with a heat-melting material.

[0008] The outer insulation layer has vent holes that match the through holes, and filter blocks are connected inside the vent holes.

[0009] A segmented sheath is fixedly connected between two adjacent outer insulation layers. The segmented sheath includes a rigid protective shell. A control box is fixedly connected to the outer end of the rigid protective shell. An annular air tube communicating with the control box is fixedly connected to the inner wall of the rigid protective shell. A guide column, which is inserted into multiple hollow protective pads, is fixedly connected to the annular air tube. The annular air tube communicates with multiple guide columns.

[0010] The control box is fixedly connected to a terminal block that is electrically connected to the fiber optic temperature sensor inside the support core. The control box is also equipped with a data transmission device and an air intake pipe.

[0011] The aforementioned high-safety overhead insulated cables enable real-time monitoring and intelligent control of cable operation status, which easily improves the safety performance of the cables.

[0012] As a further improvement of this application, the elastic heat-conducting strip includes a narrow end and a wide end, which are connected by a pair of straight sections. The cross-section of the supporting ribs is trapezoidal, and the supporting ribs are fixedly connected between the inner walls of the pair of straight sections.

[0013] As a further improvement of this application, the inner end and the outer end of the wire core are respectively in the shape of a long inferior arc and a short inferior arc, and the inner end and the outer end of the wire core are connected by a planar part, and the planar part is in contact with the straight section of the hollow protective pad.

[0014] As a further improvement of this application, the support core includes a planar end that matches the narrow ends of four elastic heat-conducting strips respectively. Adjacent planar ends are connected by a curved surface, and the curved surface fits the wire core. A groove is provided on the planar end, and the groove is coated with thermally conductive adhesive for bonding the elastic heat-conducting strips.

[0015] As another improvement of this application, the control box is connected to an external fan through an air inlet pipe. An L-shaped guide channel communicating with one end of an annular air pipe is opened inside the control box, and an air guide column communicating with the L-shaped guide channel is fixedly connected to the control box.

[0016] As another improvement of this application, the vent holes are conical, and the surface of the filter block is covered with a waterproof and breathable membrane.

[0017] As another improvement of this application, an isolation layer is fixedly connected inside the hollow protective pad. The isolation layer is located on one side of the annular air pipe, and the diameter of the discharge hole on the air inlet side of the support rib facing the hollow protective pad is smaller than the diameter of the discharge hole on the other side.

[0018] As another improvement of this application, it also includes an auxiliary protection system, which includes a processor connected to multiple control boxes, and the processor is connected to a control module, a monitoring module and a data processing module.

[0019] The control module is used to control the operation of the fan;

[0020] The monitoring module is used to collect and preprocess the monitoring data transmitted by the control box; the fiber optic temperature sensor inside the support core transmits data to the monitoring module through the control box.

[0021] The data processing module is used to process and analyze monitoring data, and send control commands to the control module based on the analysis results and preset processing programs.

[0022] In summary, this solution enables real-time monitoring and intelligent control of cable operating status, which easily improves cable safety performance. Through the design of a ventilated and emergency flame-retardant hollow protective pad, the heat dissipation efficiency and safety performance of the cable are improved, and the cable's adaptability to high-temperature environments is enhanced. Attached Figure Description

[0023] Figure 1 This is a partial perspective view of the cable according to the first embodiment of this application;

[0024] Figure 2 This is a segmented sheath diagram of the first embodiment of this application;

[0025] Figure 3 This is a cross-sectional view of the cable according to the first embodiment of this application;

[0026] Figure 4 for Figure 3 Schematic diagram of the structure at point A;

[0027] Figure 5 for Figure 3 Schematic diagram of the structure at point B;

[0028] Figure 6This is a side cross-sectional view of the cable according to the first embodiment of this application;

[0029] Figure 7 for Figure 6 Schematic diagram of the structure at point C;

[0030] Figure 8 for Figure 6 Schematic diagram of the structure at point D;

[0031] Figure 9 This is a system block diagram of the second embodiment of this application.

[0032] Explanation of the labels in the diagram:

[0033] 1. Outer insulation layer; 2. Wire core; 3. Support core; 4. Hollow protective pad; 41. Elastic heat-conducting strip; 42. Support ribs; 5. Segmented sheath; 51. Rigid protective shell; 52. Control box; 53. Annular air tube; 54. Air guide column; 55. Terminal block. Detailed Implementation

[0034] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0035] Implementation method 1:

[0036] Figures 1-7 The diagram shows a high-safety overhead insulated cable, comprising multiple outer insulation layers 1, with four circumferentially distributed wire cores 2 threaded between the outer insulation layers 1, a support core 3 threaded through the center of each outer insulation layer 1, and an optical fiber temperature sensor threaded inside the support core 3.

[0037] A hollow protective pad 4 is snapped between two adjacent wire cores 2. The hollow protective pad 4 includes an elastic heat-conducting strip 41. Multiple evenly distributed support ribs 42 are fixedly connected inside the elastic heat-conducting strip 41. A through hole is opened on the elastic heat-conducting strip 41 between two adjacent support ribs 42.

[0038] The support core 3 includes a flat end that matches the narrow end of each of the four elastic heat-conducting strips 41. Adjacent flat ends are connected by a curved surface, and the curved surface fits into the wire core 2. A groove is provided on the flat end, and the groove is coated with thermally conductive adhesive for bonding the elastic heat-conducting strips 41.

[0039] The elastic heat-conducting strip 41 includes a narrow end and a wide end, which are connected by a pair of straight sections. The cross-section of the supporting rib 42 is trapezoidal, and the supporting rib 42 is fixedly connected between the inner walls of the pair of straight sections.

[0040] The support ribs 42 are filled with flame retardant, which is filled by a person skilled in the art using a suitable flame retardant from the prior art. The flame retardant includes solid powder flame retardant and liquid flame retardant. The support ribs 42 are provided with discharge holes, and the openings of the discharge holes are sealed with a hot-melting material. The hot-melting material with a suitable melting point from the prior art is selected by a person skilled in the art, such as hot melt adhesive. When the local temperature of the cable is too high, the hot-melting material melts, the discharge holes open, and under the squeezing action of the adjacent cores 2 and the airflow, the flame retardant flows out, which easily slows down the spread of fire and increases the fire resistance time of the cable.

[0041] The inner and outer ends of the wire core 2 are respectively in the shape of a long inferior arc and a short inferior arc. The inner and outer ends of the wire core 2 are connected by a flat part, and the flat part is in contact with the straight section of the hollow protective pad 4.

[0042] The outer insulation layer 1 has vent holes that match the through holes, and filter blocks are connected inside the vent holes; the vent holes are conical, and the surface of the filter blocks is covered with a waterproof and breathable membrane.

[0043] A segmented sheath 5 is fixedly connected between two adjacent outer insulation layers 1. The segmented sheath 5 includes a rigid protective shell 51. A control box 52 is fixedly connected to the outer end of the rigid protective shell 51. An annular air pipe 53 communicating with the control box 52 is fixedly connected to the inner wall of the rigid protective shell 51. A guide column 54, which is inserted into a plurality of hollow protective pads 4, is fixedly connected to the annular air pipe 53. The annular air pipe 53 communicates with the plurality of guide columns 54.

[0044] The control box 52 is fixedly connected to a terminal 55 that is electrically connected to the fiber optic temperature sensor inside the support core 3. The control box 52 is also equipped with a data transmission device and an air intake pipe.

[0045] The control box 52 is connected to an external fan through an air inlet pipe. An L-shaped guide channel communicating with one end of the annular air pipe 53 is opened inside the control box 52. An air guide column 54 communicating with the L-shaped guide channel is fixedly connected to the control box 52.

[0046] During the use of the cable in this embodiment, when the external ambient temperature rises abnormally, the fiber optic temperature sensor can monitor the temperature in real time and transmit the temperature signal to the data processing unit inside the control box 52. The data processing unit determines whether the current temperature exceeds the safe range based on a preset safe temperature threshold. Once an overheating situation is detected, the data processing unit immediately starts the external fan and injects cooling gas into the control box 52 through the air inlet pipe. The cooling gas enters the annular air pipe 53 along the L-shaped guide channel and is evenly distributed into the interior of each hollow protective pad 4 through multiple air guide columns 54, forming an effective heat dissipation channel. This quickly removes heat from the outer surface of the cable, preventing the cable from being damaged due to overheating and ensuring the safe and stable operation of the cable in extreme environments.

[0047] When the cable temperature rises to above the pyrolysis temperature of the molten material, the vent hole seal fails. At this time, when the airflow flows inside the hollow protective pad 4, it enters the support rib 42 and blows out the flame retardant, assisting in the diffusion of the flame retardant.

[0048] Meanwhile, the data transmission device uploads real-time monitoring data to the remote monitoring system, enabling maintenance personnel to promptly grasp the cable status and take corresponding measures, further improving the safety and reliability of cable use.

[0049] This embodiment improves the cable's self-protection capability in high-temperature environments by intelligently controlling the airflow introduced by the fan and coordinating it with the physical structure of the hollow protective pad 4. The cooling gas is evenly distributed into each hollow protective pad 4 under the guidance of the annular air pipe 53 and the air guide column 54, effectively removing the heat from the wire core 2 and preventing the cable from overheating.

[0050] The second implementation method:

[0051] Figure 9 As shown, an isolation layer is fixedly connected inside the hollow protective pad 4. The isolation layer is located on one side of the annular air pipe 53. The diameter of the discharge hole on the air inlet side of the support rib 42 facing the hollow protective pad 4 is smaller than the diameter of the discharge hole on the other side. After the heat-melting material at the discharge hole melts, the flame retardant in the auxiliary support rib 42 is discharged when the airflow passes through the discharge hole.

[0052] It also includes an auxiliary protection system, which includes a processor that is connected to multiple control boxes 52 via signals. The processor is connected to a control module, a monitoring module, and a data processing module.

[0053] The control module is used to control the operation of the fan;

[0054] The monitoring module is used to collect and preprocess the monitoring data transmitted by the control box 52; the fiber optic temperature sensor in the support core 3 transmits data to the monitoring module through the control box 52; the fiber optic temperature sensor is used to detect the temperature of the core 2 between two adjacent segment sheaths 5.

[0055] The data processing module is used to process and analyze monitoring data, and send control commands to the control module according to the analysis results and preset processing programs; when the temperature data collected by the fiber optic temperature sensor exceeds the set value, the data processing module sends control commands to the control module to make the fan work to input airflow into the hollow protective pad 4.

[0056] The auxiliary protection system of this embodiment realizes comprehensive monitoring and intelligent response of cable status; the system analyzes the monitoring data from the fiber optic temperature sensor in real time to accurately determine the operating status of the cable.

[0057] When an abnormal situation is detected, such as when the temperature exceeds the set value, the data processing module will quickly generate control commands based on the preset safety policy and activate corresponding countermeasures through the control module, such as starting the fan for heat dissipation; this enhances the intelligence level of cable operation and maintenance management and ensures the continuity and stability of power transmission.

[0058] In summary, this solution enables real-time monitoring and intelligent control of cable operation status, which easily improves cable safety performance. The hollow protective pad structure with ventilation and emergency flame retardancy enhances the cable's heat dissipation efficiency and safety performance, and easily strengthens the cable's adaptability to high-temperature environments.

[0059] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A high safety overhead insulated cable, comprising a plurality of outer insulation layers (1), four cores (2) being arranged in a circumferential distribution between the plurality of outer insulation layers (1), characterized in that: The middle part of the outer insulation layer (1) is provided with a supporting core (3), an optical fiber temperature sensor is arranged in the supporting core (3), a hollow protective pad (4) is clamped between two adjacent wire cores (2), the hollow protective pad (4) comprises an elastic heat-conducting strip (41), a plurality of uniformly distributed supporting rib rows (42) are fixedly connected in the elastic heat-conducting strip (41), a through hole is formed in the elastic heat-conducting strip (41) between two adjacent supporting rib rows (42), and the supporting rib rows (42) are filled with a flame retardant. A ventilation hole matched with the through hole is formed in the outer insulation layer (1), and a filter block is connected in the ventilation hole. Two adjacent outer insulation layers (1) are fixedly connected with a sectional sheath (5), the sectional sheath (5) comprises a rigid protective shell (51), a control box (52) is fixedly connected to the outer end of the rigid protective shell (51), an annular air pipe (53) in communication with the control box (52) is fixedly connected to the inner wall of the rigid protective shell (51), and air guide columns (54) respectively inserted into the hollow protective pads (4) are fixedly connected to the annular air pipe (53). A terminal (55) electrically connected with the optical fiber temperature sensor in the supporting core (3) is fixedly connected to the control box (52), and a data transmission device and an air inlet pipe are mounted on the control box (52).

2. A high safety overhead insulated cable according to claim 1, characterized in that: The elastic heat-conducting strip (41) comprises a narrow head end and a wide head end, the narrow head end and the wide head end are connected by a pair of flat sections, the cross section of the supporting rib row (42) is trapezoidal, and the supporting rib row (42) is fixedly connected between the inner walls of the pair of flat sections.

3. A high safety overhead insulated cable according to claim 2, characterized in that: The inner side end and the outer side end of the wire core (2) are in the shapes of long and short inferior arcs, respectively, the inner side end and the outer side end of the wire core (2) are connected by a flat section, and the flat section is attached to the flat section of the hollow protective pad (4).

4. A high safety overhead insulated cable according to claim 2, characterized in that: The supporting core (3) comprises flat ends matched with the narrow head ends of the four elastic heat-conducting strips (41), respectively, two adjacent flat ends are connected by a curved surface, and the curved surface is attached to the wire core (2), a glue groove is formed in the flat end, and heat-conducting glue for bonding the elastic heat-conducting strip (41) is coated on the glue groove.

5. A high safety overhead insulated cable according to claim 1, characterized in that: The control box (52) is connected with an external air blower through the air inlet pipe, an L-shaped flow guide channel in communication with one end of the annular air pipe (53) is formed in the control box (52), and one air guide column (54) in communication with the L-shaped flow guide channel is fixedly connected to the control box (52).

6. A high safety overhead insulated cable according to claim 1, characterized in that: The ventilation hole is conical, and a waterproof and breathable film is laid on the surface of the filter block.

7. A high safety overhead insulated cable according to claim 1, characterized in that: The hollow protective pad (4) is fixedly connected with an isolation layer, the isolation layer is located on one side of the annular air pipe (53), and the discharge hole on the supporting rib row (42) towards the air inlet side of the hollow protective pad (4) has a smaller diameter than the discharge hole on the other side.

8. A high safety overhead insulated cable according to any one of claims 1 to 7, characterized in that: Also include auxiliary protection system, the auxiliary protection system includes processor signal connection with a plurality of regulation box (52), the processor is connected with control module, monitoring module and data processing module; The control module is used for controlling the fan to work; The monitoring module is used for collecting and preprocessing the monitoring data transmitted by the regulation box (52); the optical fiber temperature sensor in the support core (3) transmits data to the monitoring module through the regulation box (52); The data processing module is used for processing and analyzing the monitoring data, and sending control instructions to the control module according to the analysis result and the preset processing program.

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