Light and environmentally-friendly high-voltage cable and manufacturing method therefor

Abstract

A light and environmentally-friendly high-voltage cable and a manufacturing method therefor. A conductor core is provided in the center of the light and environmentally-friendly high-voltage cable; a semiconductor electrical wrapping tape surrounds the outer side of the conductor core; a conductor shielding layer surrounds the outer side of the semiconductor electrical wrapping tape; an insulating layer is provided on the outer side of the conductor shielding layer, the insulating layer contains a modified polypropylene insulating material, and the polypropylene insulating material is subjected to air separation for impurity removal by means of an impurity removal device and is then guided to an extruder for extrusion, so as to obtain the insulating layer; an insulating shielding layer surrounds the outer side of the insulating layer; a semi-conductive waterproof layer is provided on the outer side of the insulating shielding layer; a metallic sheath is provided on the outer side of the semi-conductive waterproof layer, and the metal sheath is formed by an open helically wound profiled copper wire combined with a smooth copper sheath; an anti-corrosion layer is provided on the outer side of the metal sheath; a flame-retardant sheath is provided on the outer side of the anti-corrosion layer; and a conductive layer is provided on the outer side of the flame-retardant sheath.

Description

Lightweight environmentally friendly high-voltage cable and manufacturing method thereof

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 31, 2024, with application number 202410144652.6 and application name “Lightweight and environmentally friendly high-voltage cable and its manufacturing method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of high-voltage cables, and in particular to a lightweight, environmentally friendly high-voltage cable and a manufacturing method thereof. Background Art

[0003] In the current dual-carbon environment, with the increasing number of pumped-storage power stations and hydropower station projects, the widespread use of safe and environmentally friendly high-voltage cables is an inevitable trend in the future development of my country's high-voltage power transmission and distribution. The high-voltage cables used in these projects are mostly installed vertically with large drop heights. To reduce the impact of gravity on the cables during vertical drop heights, the development of lightweight and environmentally friendly high-voltage cables is particularly important.

[0004] The corrugated aluminum sheath structure used in current high-voltage cables has a large outer diameter and is heavy. The other type of cable with a smooth aluminum sheath carries a small short-circuit current, which is not conducive to lightweighting of high-voltage cables. Cross-linked polyethylene can be made transparent by boiling silicone oil in a sample, thereby detecting micropores and impurities at the insulation interface. However, cross-linked polyethylene has a high insulation density and is non-degradable, making it difficult to recycle. Other materials, due to their own characteristics, may not necessarily appear transparent or translucent at high temperatures, making it impossible to monitor their interface state. If the insulating material contains impurities and cannot be detected, this phenomenon poses a major quality risk. At the same time, the purity of the insulating material is very important. Currently, cleanliness can only be guaranteed in the material manufacturing process. When the cleanliness of the granulation process cannot be guaranteed, the feeding process in the existing cable production does not have any impurity removal measures.

[0005] Summary of the Invention

[0006] In order to solve the problems in the prior art, the embodiments of the present application provide a lightweight, environmentally friendly high-voltage cable and a manufacturing method thereof.

[0007] An embodiment of the present application provides a lightweight, environmentally friendly high-voltage cable, wherein a conductor core is provided in the center of the lightweight, environmentally friendly high-voltage cable, a semiconductor electrical tape is provided around the outside of the conductor core, a conductor shielding layer is provided around the outside of the semiconductor electrical tape, an insulating layer is provided around the outside of the conductor shielding layer, the insulating layer comprises modified polypropylene insulation material, an insulating shielding layer is provided around the outside of the insulating layer, a semiconductor water-repellent layer is provided on the outside of the insulating shielding layer, a metal sheath is provided on the outside of the semiconductor water-repellent layer, an anti-corrosion layer is provided on the outside of the metal sheath, a flame-retardant sheath is provided on the outside of the anti-corrosion layer, and a conductive layer is provided on the outside of the flame-retardant sheath.

[0008] In one embodiment, the metal sleeve is formed by combining a sparsely wound profiled copper wire and a smooth copper sleeve.

[0009] In one embodiment, the density of the insulating layer is 0.6 g / cm 3 to 0.83g / cm 3 , the thickness of the insulating layer is 10 mm to 14 mm.

[0010] In one embodiment, a conductor reinforcement is disposed inside the conductor core.

[0011] An embodiment of the present application also provides a method for manufacturing a lightweight, environmentally friendly high-voltage cable, which is used to manufacture a lightweight, environmentally friendly high-voltage cable as described in any one of the aforementioned embodiments. The insulation layer is manufactured by an extrusion process. In the extrusion process, polypropylene insulation material particles are subjected to an impurity removal step in an impurity removal device. After completing the impurity removal step, the polypropylene insulation material particles are then guided by the impurity removal device to an extruder for extrusion to obtain the insulation layer. The impurity removal device removes impurities doped in the polypropylene insulation material particles by air separation.

[0012] In one embodiment, the impurity removal device includes a silo, a fan and a filter. The silo has a first cavity capable of accommodating the polypropylene insulating material particles. The fan has a generator capable of generating airflow and a second cavity capable of transmitting airflow. The fan is connected to the silo so that the first cavity and the second cavity are connected. The filter is arranged between the silo and the fan to separate the first cavity and the second cavity.

[0013] In one embodiment, the impurity removal device further includes a feed port and a discharge port, wherein the feed port and the discharge port are respectively connected to the silo and communicate with the first cavity, and the polypropylene insulating material particles that have not undergone the impurity removal step enter the first cavity through the feed port for impurity removal, and the polypropylene insulating material particles that have undergone the impurity removal step are discharged to the extruder through the discharge port, and the discharge port is located below the feed port in the direction of gravity compared to the feed port.

[0014] In one embodiment, the silo is tilted and the first cavity is tilted and extended. The silo includes a loading side and a unloading side arranged in sequence along the direction of gravity. The feed port is connected to the loading side, and the unloading port is connected to the unloading side. The filter is set between the loading side and the unloading side.

[0015] In one embodiment, the mesh size of the filter is in the range of 10 to 40 meshes, and a collecting bag is further connected to the side of the fan away from the silo, and the collecting bag is connected to the second cavity. Impurities mixed in the polypropylene insulating material particles are driven by the fan to move from the first cavity to the second cavity and further to the collecting bag.

[0016] In one embodiment, the manufacturing method includes the following steps:

[0017] Providing the conductor core, which is formed by drawing wires, twisting strands, and dividing the conductors into cables;

[0018] Arranging the semiconductor electrical tape outside the conductor core;

[0019] The conductor shielding layer, the insulating layer and the insulating shielding layer are formed in sequence from the inside to the outside on the outer side of the semiconductor tape through three-layer co-extrusion;

[0020] The semiconducting resistive water layer is arranged on the outer side of the insulating shielding layer;

[0021] The metal sleeve, the anti-corrosion layer, the flame-retardant sheath and the conductive layer are sequentially arranged on the outside of the semi-conductive resistive water layer from the inside to the outside.

[0022] Furthermore, the lightweight, environmentally friendly high-voltage cable and its manufacturing method provided in the embodiments of the present application have at least the following beneficial effects:

[0023] First, the insulation layer of the lightweight, environmentally friendly high-voltage cable provided in the present embodiment utilizes modified polypropylene insulation, which has a lower density than traditional cross-linked polyethylene and is recyclable. Furthermore, polypropylene insulation has excellent electrical properties, further reducing the cable's insulation thickness. This makes the insulation layer even thinner than conventional 110kV cross-linked polyethylene insulation, significantly reducing the cable's weight.

[0024] Second: The metal sheath of the lightweight environmentally friendly high-voltage cable provided in the embodiment of the present application adopts a structure that combines sparsely wound profiled copper wires and smooth copper sheaths. The sparsely wound profiled copper wires can increase the short-circuit current of the metal sheath of the lightweight environmentally friendly high-voltage cable and improve the safety of line operation. Compared with the traditional sparsely wound round copper wires, the sparsely wound profiled copper wires have excellent lateral pressure resistance and reduce construction difficulty.

[0025] Third: The manufacturing method of the lightweight environmentally friendly high-voltage cable provided in the embodiment of the present application adds an impurity removal device during the feeding process to improve the cleanliness of the cable insulation material, thereby improving product quality.

[0026] An impurity removal device is added between the feeding room and the extruder hopper. The insulation material can be directly fed into the impurity removal device's hopper by suction or gravity. Due to inertia, the pellets roll freely in the hopper. A filter with a mesh size between 10 and 40 is installed on the hopper surface. The wind from the fan sucks small impurities into the collection bag. Further screening is performed based on the different wind resistances encountered by the polypropylene insulation material and impurities, depending on their gravity and size, to remove any impurities contained within. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic structural diagram of a lightweight environmentally friendly high-voltage cable provided in an embodiment of the present application;

[0028] FIG2 is a schematic flow chart of a method for manufacturing a lightweight, environmentally friendly, high-voltage cable according to an embodiment of the present application;

[0029] FIG3 is a front view schematic diagram of the structure of the impurity removal device used in the manufacturing method of the lightweight environmentally friendly high-voltage cable provided in an embodiment of the present application;

[0030] FIG4 is a side view schematic diagram of the structure of an impurity removal device used in the method for manufacturing a lightweight, environmentally friendly high-voltage cable provided in an embodiment of the present application;

[0031] FIG5 is a schematic cross-sectional view of the structure of the impurity removal device used in the manufacturing method of the lightweight environmentally friendly high-voltage cable provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1-Lightweight environmentally friendly high-voltage cable; 101-Conductor core; 102-Semiconductor electrical tape; 103-Conductor shielding layer; 104-Insulation layer; 105-Insulation shielding layer; 106-Semiconductor water-repellent layer; 107-Metal sheath; 108-Anti-corrosion layer; 109-Flame-retardant sheath; 110-Conductive layer; 111-Conductor reinforcement; 2-Impurity removal device; 21-Silo; 210-First cavity; 211-Feeding side; 212-Discharging side; 22-Fan; 220-Second cavity; 221-Generator; 23-Filter; 24-Feeding port; 25-Discharging port; 26-Pillar; 27-Collection bag. DETAILED DESCRIPTION

[0034] The following description will refer to the accompanying drawings to more fully describe the contents of this application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be interpreted as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make this application thorough and complete and to fully convey the scope of this application to those skilled in the art. Similar figure numerals represent identical or similar components. The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit this application. As used herein, unless the context clearly indicates otherwise, the singular forms "one", "an" and "the" are intended to also include plural forms. In addition, when used herein, "includes" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or their groups. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. Furthermore, unless explicitly defined herein, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and the content of this application, and will not be interpreted as an idealized or overly formal meaning.

[0035] Typically, the corrugated aluminum sheath structure used in current high-voltage cables has a large outer diameter and is heavy. The smooth aluminum sheath structure, on the other hand, carries less short-circuit current, hindering lightweight high-voltage cables. We understand that cross-linked polyethylene (XLPE) insulation has a high density, is non-degradable, and is difficult to recycle. Therefore, exploring alternative materials to XLPE for lightweight, environmentally friendly high-voltage cables is a viable approach. Cross-linked polyethylene can be rendered transparent by boiling silicone oil in a sample, allowing for detection of micropores and impurities at the insulation interface. However, other materials, due to their inherent properties, may not necessarily become transparent or translucent at high temperatures, making their interface conditions difficult to monitor. If impurities are present in the insulation material and cannot be detected, this presents a significant quality risk. Furthermore, the purity of the insulation material is crucial. Currently, this can only be guaranteed during the material manufacturing process. If the cleanliness of the granulation process cannot be guaranteed, the existing feeding process in cable production lacks impurity removal measures.

[0036] Correspondingly, an embodiment of the present application provides a lightweight, environmentally friendly high-voltage cable, wherein the center of the lightweight, environmentally friendly high-voltage cable is provided with a conductor core, a semiconductor electrical tape is provided around the outside of the conductor core, a conductor shielding layer is provided around the outside of the semiconductor electrical tape, an insulating layer is provided outside the conductor shielding layer, the insulating layer comprises a modified polypropylene insulation material, an insulating shielding layer is provided around the outside of the insulating layer, a semiconducting water-resistant layer is provided outside the insulating shielding layer, a metal sheath is provided outside the semiconducting water-resistant layer, an anti-corrosion layer is provided outside the metal sheath, a flame-retardant sheath is provided outside the anti-corrosion layer, and a conductive layer is provided outside the flame-retardant sheath. An embodiment of the present application also provides a method for manufacturing a lightweight, environmentally friendly high-voltage cable, which is used to manufacture a lightweight, environmentally friendly high-voltage cable as described in any of the aforementioned embodiments, wherein the insulating layer is manufactured by an extrusion process, in which polypropylene insulating material particles are subjected to an impurity removal step in a de-impurity removal device. After completing the de-impurity removal step, the polypropylene insulating material particles are then guided by the de-impurity removal device to an extruder for extrusion to obtain the insulating layer, and the de-impurity removal device removes impurities doped in the polypropylene insulating material particles by air separation.

[0037] Furthermore, the lightweight, environmentally friendly high-voltage cable and its manufacturing method provided in the embodiments of the present application have at least the following beneficial effects: First, the insulation layer of the lightweight, environmentally friendly high-voltage cable provided in the embodiments of the present application uses modified polypropylene insulation material, which has a lower density than traditional cross-linked polyethylene, and the polypropylene is recyclable. At the same time, the polypropylene insulation has excellent electrical properties, which can further reduce the thickness of the cable insulation, making the thickness of the insulation layer thinner than that of conventional 110kV cross-linked polyethylene insulation, greatly reducing the weight of the cable product itself. Second, the metal sheath of the lightweight, environmentally friendly high-voltage cable provided in the embodiments of the present application adopts a structure that combines sparse winding of shaped copper wire and smooth copper sheath. The sparse winding of shaped copper wire can increase the short-circuit current of the metal sheath of the lightweight, environmentally friendly high-voltage cable, improve line operation safety, and the sparse winding of shaped copper wire has excellent lateral pressure resistance compared to traditional sparse winding of round copper wire, reducing construction difficulty. Third, the manufacturing method of the lightweight, environmentally friendly high-voltage cable provided in the embodiments of the present application adds an impurity removal device during the feeding process to improve the cleanliness of the cable insulation material, thereby improving product quality.

[0038] The following describes exemplary embodiments with reference to the accompanying drawings. It should be noted that the components depicted in the accompanying drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0039] The specific implementation methods of the present application are further described in detail below with reference to the accompanying drawings.

[0040] As shown in Figure 1, an embodiment of the present application provides a lightweight, environmentally friendly high-voltage cable 1. A conductor core 101 is provided in the center of the lightweight, environmentally friendly high-voltage cable 1. A semiconductor electrical tape 102 is provided around the outside of the conductor core 101. A conductor shielding layer 103 is provided around the outside of the semiconductor electrical tape 102. An insulating layer 104 is provided on the outside of the conductor shielding layer 103. The insulating layer 104 includes a modified polypropylene insulation material. An insulating shielding layer 105 is provided around the outside of the insulating layer 104. A semiconductor water-repellent layer 106 is provided on the outside of the insulating shielding layer 105. A metal sheath 107 is provided on the outside of the semiconductor water-repellent layer 106. An anti-corrosion layer 108 is provided on the outside of the metal sheath 107. A flame-retardant sheath 109 is provided on the outside of the anti-corrosion layer 108. A conductive layer 110 is provided on the outside of the flame-retardant sheath 109.

[0041] In one embodiment, the material of the insulating layer 104 is mainly modified polypropylene insulating material (or simply referred to as polypropylene insulating material), and the density of the insulating layer 104 is 0.6 g / cm 3 to 0.83g / cm 3 , the thickness of the insulating layer 104 is 10 mm to 14 mm.

[0042] It is understandable that the insulating layer 104 of the lightweight environmentally friendly high-voltage cable 1 provided in the embodiment of the present application adopts modified polypropylene insulation material, which has a lower density than traditional cross-linked polyethylene (the density of the insulating layer 104 mainly composed of polypropylene insulation material is 0.6g / cm 3 to 0.83g / cm 3 ), and polypropylene is recyclable. Furthermore, polypropylene insulation has excellent electrical properties, further reducing the cable insulation thickness. This makes the insulation layer 104 even thinner than conventional 110kV cross-linked polyethylene insulation layers (the thickness of the insulation layer 104 is reduced from 16mm for conventional cross-linked polyethylene insulation layers 104 to 10mm to 14mm for the polypropylene insulation layer 104 of this application), significantly reducing the cable's weight. Therefore, this high-voltage cable is considered "lightweight" and "environmentally friendly."

[0043] In this embodiment, the density of the insulating layer 104 can be specifically 0.61 g / cm 3 , 0.62g / cm 3 , 0.63g / cm 3 , 0.64g / cm 3 , 0.65g / cm 3 , 0.66g / cm 3 , 0.67g / cm 3 , 0.68g / cm 3 , 0.69g / cm 3 , 0.70g / cm 3 , 0.71g / cm 3, 0.72g / cm 3 , 0.73g / cm 3 , 0.74g / cm 3 , 0.75g / cm 3 , 0.76g / cm 3 , 0.77g / cm 3 , 0.78g / cm 3 , 0.79g / cm 3 、0.80g / cm 3 , 0.81g / cm 3 , 0.82g / cm 3 .

[0044] In this embodiment, the thickness of the insulating layer 104 may be 11 mm, 12 mm, or 13 mm.

[0045] In one embodiment, the metal sleeve 107 is formed by combining a sparsely wound profiled copper wire and a smooth copper sleeve.

[0046] It can be understood that the metal sheath 107 of the lightweight environmentally friendly high-voltage cable 1 provided in the embodiment of the present application adopts a structure that combines sparsely wound profiled copper wires and smooth copper sheaths. The sparsely wound profiled copper wires can increase the short-circuit current of the metal sheath 107 of the lightweight environmentally friendly high-voltage cable 1 and improve the line operation safety. Compared with the traditional sparsely wound round copper wires, the sparsely wound profiled copper wires have excellent lateral pressure resistance and reduce construction difficulty.

[0047] In one embodiment, a conductor reinforcement member 111 is provided inside the conductor core 101. It is understandable that the conductor reinforcement member 111 can be a metal or non-metal hollow bracket for reinforcing and supporting the conductor core 101.

[0048] In one embodiment, from the inside to the outside, the semiconductive water-blocking layer 106 includes a semiconductive copper wire cloth water-blocking tape and a semiconductive buffer water-blocking tape in sequence. The metal sleeve 107 and the flame-retardant sheath 109 (such as a polyethylene outer sheath) can achieve a radial water-blocking effect. The radial water-blocking function of the semiconductive buffer water-blocking tape and the metal sleeve 107 is conducive to further improving the water-blocking performance of the lightweight environmentally friendly high-voltage cable 1 and ensuring the safe operation performance of the cable. At the same time, a metal sleeve 107 is provided on the outside of the semiconductive water-blocking layer 106 so that the metal sleeve 107 and the semiconductive water-blocking layer 106 are in surface contact, which is conducive to improving the safe operation performance of the lightweight environmentally friendly high-voltage cable 1. The cable structure with the metal sleeve 107 is relatively compact, so the water-blocking effect will be better.

[0049] Further in conjunction with FIG2 , the embodiment of the present application further provides a method for manufacturing a lightweight environmentally friendly high-voltage cable 1 , comprising the following steps:

[0050] Providing a conductor core 101, the conductor core 101 is formed by drawing wires, stranding strands, and dividing the conductors into cables;

[0051] A semiconductor electrical tape 102 is provided outside the conductor core 101;

[0052] A conductor shielding layer 103, an insulating layer 104 and an insulating shielding layer 105 are formed on the outer side of the semiconductor tape 102 from the inside to the outside through three-layer co-extrusion;

[0053] A semiconducting water layer 106 is provided on the outer side of the insulating shielding layer 105;

[0054] A metal sheath 107 , an anti-corrosion layer 108 , a flame retardant sheath 109 and a conductive layer 110 are sequentially arranged on the outside of the semi-conductive water-repellent layer 106 from the inside out.

[0055] Further in combination with Figures 3 to 5, in one embodiment, the manufacturing method of the lightweight environmentally friendly high-voltage cable 1 is used to manufacture a lightweight environmentally friendly high-voltage cable 1 as in any one of the aforementioned embodiments. The insulating layer 104 is manufactured by an extrusion process. In the extrusion process, the polypropylene insulating material particles are subjected to a de-impurity step in a de-impurity device 2. After completing the de-impurity step, the polypropylene insulating material particles are then exported from the de-impurity device 2 to an extruder (not shown) for extrusion to obtain the insulating layer 104. The de-impurity device 2 removes impurities doped in the polypropylene insulating material particles by air separation.

[0056] In one embodiment, the impurity removal device 2 includes a silo 21, a fan 22 and a filter 23. The silo 21 has a first cavity 210 capable of accommodating polypropylene insulating material particles. The fan 22 has a generator 221 capable of generating airflow and a second cavity 220 capable of transmitting airflow. The fan 22 is connected to the silo 21 to communicate with the first cavity 210 and the second cavity 220. The filter 23 is arranged between the silo 21 and the fan 22 to separate the first cavity 210 and the second cavity 220.

[0057] As will be understood, generator 221 is a device capable of generating airflow, and may comprise a structure such as a fan or vacuum cleaner. It may be a known and feasible device, and its specific structure is not described here. Filter 23 may be a hard or soft mesh structure. Parameters such as the density and number of openings in filter 23 can be adjusted based on the specific conditions of the polypropylene insulation material particles and the impurities they contain, and are not described here. Adjustment of filter 23 parameters can be combined with adjustment of generator 221 parameters to further enhance impurity removal.

[0058] In one embodiment, the impurity removal device 2 further includes a feed port 24 and a discharge port 25, which are respectively connected to the silo 21 and communicated with the first cavity 210. The polypropylene insulating material particles that have not undergone the impurity removal step enter the first cavity 210 through the feed port 24 for impurity removal, and the polypropylene insulating material particles that have undergone the impurity removal step are discharged to the extruder through the discharge port 25. The discharge port 25 is located below the feed port 24 in the direction of gravity.

[0059] As will be appreciated, the feed port 24 can be used to connect the silo 21 to a storage container containing polypropylene insulation material. A valve to control the opening or closing of the channel can be provided between the feed port 24 and the silo 21. The discharge port 25 can be used to connect the silo 21 to the hopper of the extruder, allowing the cleaned polypropylene insulation material particles to enter the extruder for extrusion.

[0060] In one embodiment, the silo 21 is tilted and the first cavity 210 is tilted and extended. The silo 21 includes a loading side 211 and a unloading side 212 arranged in sequence along the direction of gravity. The feed port 24 is connected to the loading side 211, and the unloading port 25 is connected to the unloading side 212. The filter screen 23 is located between the loading side 211 and the unloading side 212.

[0061] It can be understood that the polypropylene insulation material particles can be dispersed by means of their own gravity, so that impurities mixed in the particles can be discharged into the second cavity 220 by the airflow, thereby removing impurities from the polypropylene insulation material particles and further allowing the polypropylene insulation material particles after impurities removal to fall into the extruder under the action of gravity.

[0062] In one embodiment, the mesh size of the filter 23 ranges from 10 mesh to 40 mesh, and a collecting bag 27 is further connected to the side of the fan 22 away from the silo 21. The collecting bag 27 is connected to the second cavity 220. Impurities mixed in the polypropylene insulating material particles are driven by the fan 22 to move from the first cavity 210 to the second cavity 220 and further move to the collecting bag 27.

[0063] In one embodiment, the impurity removal device 2 further includes a plurality of struts 26. At least some of the struts 26 are supported on the underside of the fan 22 to maintain the stability of the fan 22, and at least some of the struts 26 are supported on the lower portion of the silo 21. The struts 26 can be capable of adjusting the inclination angle of the silo 21 to facilitate further screening of the polypropylene insulation material and impurities based on their gravity and size, resulting in different wind resistance, thereby removing impurities contained therein.

[0064] It can be understood that the manufacturing method of the lightweight environmentally friendly high-voltage cable 1 provided in the embodiment of the present application adds an impurity removal device 2 during the feeding process to improve the cleanliness of the cable insulation material, thereby improving the product quality. An impurity removal device 2 is added in the feeding room (not shown) and the hopper of the extruder (not shown). The polypropylene insulation material can be directly fed into the silo 21 of the impurity removal device 2 by suction or gravity drop. According to the effect of inertia, the pellets are in a free rolling state in the silo 21. A filter screen 23 is provided between the silo 21 and the fan 22. The mesh number of the filter screen 23 is between 10 and 40 meshes. The wind force of the fan 22 sucks small impurities into the bag at the end of the fan 22. Further screening can be performed based on the different wind resistances received by the polypropylene insulation material and the impurities due to their different gravity and size, so that the impurities contained therein are screened out.

[0065] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A lightweight environmentally friendly high-voltage cable, characterized in that: The center of the lightweight environmentally friendly high-voltage cable is provided with a conductor core, the outside of the conductor core is surrounded by a semiconductor electrical tape, the outside of the semiconductor electrical tape is surrounded by a conductor shielding layer, the outside of the conductor shielding layer is provided with an insulating layer, the insulating layer includes modified polypropylene insulation material, the outside of the insulating layer is surrounded by an insulating shielding layer, the outside of the insulating shielding layer is provided with a semiconductor water-repellent layer, the outside of the semiconductor water-repellent layer is provided with a metal sheath, the outside of the metal sheath is provided with an anti-corrosion layer, the outside of the anti-corrosion layer is provided with a flame-retardant sheath, and the outside of the flame-retardant sheath is provided with a conductive layer.

2. The lightweight environmentally friendly high-voltage cable according to claim 1, characterized in that: The metal sleeve is composed of a combination of sparsely wound profiled copper wire and a smooth copper sleeve.

3. The lightweight environmentally friendly high-voltage cable according to claim 1, characterized in that: The density of the insulating layer is 0.6 g / cm 3 to 0.83g / cm 3 , the thickness of the insulating layer is 10 mm to 14 mm.

4. The lightweight environmentally friendly high-voltage cable according to claim 1, characterized in that: A conductor reinforcement is provided inside the conductor core.

5. A method for manufacturing a lightweight environmentally friendly high-voltage cable, characterized in that: It is used to produce the lightweight environmentally friendly high-voltage cable as described in any one of claims 1 to 4, wherein the insulating layer is produced by an extrusion process. In the extrusion process, polypropylene insulating material particles are subjected to an impurity removal step in an impurity removal device. After completing the impurity removal step, the polypropylene insulating material particles are then guided by the impurity removal device to an extruder for extrusion to obtain the insulating layer. The impurity removal device removes impurities doped in the polypropylene insulating material particles by air separation.

6. The method for manufacturing a lightweight environmentally friendly high-voltage cable according to claim 5, characterized in that: The impurity removal device includes a silo, a fan and a filter. The silo has a first cavity capable of accommodating the polypropylene insulating material particles. The fan has a generator capable of generating airflow and a second cavity capable of transmitting airflow. The fan is connected to the silo to communicate with the first cavity and the second cavity. The filter is arranged between the silo and the fan to separate the first cavity and the second cavity.

7. The method for manufacturing a lightweight environmentally friendly high-voltage cable according to claim 6, characterized in that: The impurity removal device also includes a feed port and a discharge port, the feed port and the discharge port are respectively connected to the silo and communicated with the first cavity, the polypropylene insulating material particles that have not undergone the impurity removal step enter the first cavity through the feed port for impurity removal, and the polypropylene insulating material particles that have undergone the impurity removal step are discharged to the extruder through the discharge port, and the discharge port is located below the feed port in the direction of gravity.

8. The method for manufacturing a lightweight environmentally friendly high-voltage cable according to claim 7, characterized in that: The silo is tilted and causes the first cavity to extend tilted. The silo includes a loading side and a unloading side arranged in sequence along the direction of gravity. The feed port is connected to the loading side, and the unloading port is connected to the unloading side. The filter is located between the loading side and the unloading side.

9. The method for manufacturing a lightweight environmentally friendly high-voltage cable according to claim 6, characterized in that: The mesh size of the filter ranges from 10 mesh to 40 mesh. A collecting bag is also connected to the side of the fan away from the silo. The collecting bag is connected to the second cavity. Impurities doped in the polypropylene insulating material particles are driven by the fan to move from the first cavity to the second cavity and further to the collecting bag.

10. The method for manufacturing a lightweight environmentally friendly high-voltage cable according to claim 5, characterized in that: The manufacturing method comprises the following steps: Providing the conductor core, which is formed by drawing wires, twisting strands, and dividing the conductors into cables; Arranging the semiconductor electrical tape outside the conductor core; The conductor shielding layer, the insulating layer and the insulating shielding layer are formed in sequence from the inside to the outside on the outer side of the semiconductor tape through three-layer co-extrusion; The semiconducting resistive water layer is arranged on the outer side of the insulating shielding layer; The metal sleeve, the anti-corrosion layer, the flame-retardant sheath and the conductive layer are sequentially arranged on the outside of the semi-conductive resistive water layer from the inside to the outside.

Images