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    • 专利摘要:
    This invention relates to the technical field of cables, and discloses a high-voltage silicone rubber flexible cable and a processing technology thereof. It comprise a conductor (1) made of stranded copper wires. The material of the conductor (1) is tinned copper wire, and the conductor (1) is covered with an insulating shielding layer (2), a composite shielding layer (3) and an outer sheath (4) from inside to outside. The insulating shielding layer (2) includes an inner shielding layer (5), an insulating layer (6) and an outer shielding layer (7) from inside to outside. The composite shielding layer (3) is braided with semi-conductive nylon tape and tinned wire. The composite shielding layer (3) is covered with a lapped covering (8), and the outer sheath (4) is made of silicone rubber material. The invention has the characteristics of hightemperature resistance, radiation resistance, cold resistance, acid and alkali resistance, corrosive odor resistance, water resistance, etc. The cable has a flexible structure and is easy to lay with stable electrical performance under high temperature conditions, particularly outstanding anti-aging performance, and long service life. It is widely used in manufacturing industries such as metallurgy, petrochemical industry and electric power.
    公开号:NL2026325A
    申请号:NL2026325
    申请日:2020-08-21
    公开日:2021-12-13
    发明作者:Zhouhongyu Qiujinbo Wangchao Xujixin
    申请人:Zhejiang Yuantong Wire & Cable Mft Co Ltd；
    IPC主号:
    专利说明:

    A HIGH-VOLTAGE SILICONE RUBBER FLEXIBLE CABLE AND APROCESSING TECHNOLOGY THEREOF
    TECHNICAL FIELD The invention relates to the technical field of cables, in particular to a high- voltage silicone rubber flexible cable and a processing technology thereof.
    BACKGROUND ART High-voltage silicone rubber cables for high-temperature environment are mainly used in harsh environments such as metallurgy, petrochemical industry and electric power. Such cables are generally used under ambient temperatures of more than 150°C, so they must have strong oil resistance and cold resistance; in addition, the requirement for their electrical performance is extremely high, and their partial discharge cannot exceed 20Pc. At present, most of these products are imported, and there is still a great gap for such products in China.
    Existing high-voltage silicone rubber cables generally use an extruded insulating layer without inner and outer extruded semi-conductive silicone rubber shielding layers. As the cable conductor is formed by twisting multiple wires, it is easy to form air space between it and the insulating layer. As a result, the surface of the conductor is not smooth, which will cause the electric field concentration and cable breakdown and affect their service life. For example, the Chinese invention patent (application number: CN200820063200.1) discloses a heat-resistant environmentally friendly high-voltage, high-tension, high-tear-resistant insulated flexible wire and cable.
    The flexible wire includes a conductor and an insulating layer, that is, the conductor in the center of the wire with the same-core layered structure is wrapped by an environmentally-friendly high-voltage, high-tension and high-tear-resistant insulating layer. The flexible cable includes a conductor, a conductor insulating layer and an outer sheath, that is, a cable with the same-core layered structure; the conductor in the center is wrapped by an environmentally friendly high-voltage, high-tension and high- tear-resistant insulating layer, and the insulating layer is further wrapped by an environmentally friendly, high-voltage, high-tension and high-tear-resistant sheath layer. The cable in the said patent is generally used under the temperature range of 150-200°C. Under such working environment, the copper conductor is very easy to be oxidized. After oxidation, the cable resistivity will increase sharply, causing serious heating and a reduction of the service life of the cable.
    SUMMARY OF THE INVENTION Considering the disadvantages of the prior art such as poor high- temperature resistance and short service life, the invention provides a high-voltage silicone rubber flexible cable with good high-temperature resistance and long service life, and a processing technology thereof.
    To solve the said technical problems, this invention provides the following technical solution: High-voltage silicone rubber flexible cable, which comprises a conductor made of twisted copper wires. The conductor material is tin-plated copper wire, and the conductor is covered with an insulating shielding layer, a composite shielding layer and an outer sheath from inside to outside. The insulating shielding layer includes an inner shielding layer, an insulating layer and an outer shielding layer from inside to outside. The composite shielding layer is braided with semi-conductive nylon tape and tinned wire. The composite shielding layer is covered with a lapped covering, and the outer sheath is made of silicone rubber material.
    Preferably, the heat resistance rating of the insulating shielding layer is within the range of -60°~180°.
    Preferably, both the inner shielding layer and the outer shielding layer are made of semi-conductive silicone rubber.
    Preferably, the outer wall of the conductor is wrapped by a semi-conductive tape.
    Preferably, the outer sheath is made of silicone rubber material, and the heat resistance rating ranting of the outer sheath is within the range of -60°~180°.
    Preferably, the conductor includes a plurality of conductive layers made of copper wires, the lay of the conductive layers is gradually reduced from inside to outside, and the adjacent conductive layers are twisted in opposite directions.
    A processing technology of high-voltage silicone rubber flexible cable, including the said high-voltage silicone rubber flexible cable, and further including the following process steps: Step 1: Strand the single wires first. After the stranding is completed, the stranded wires are twisted through regular twisting to form a conductor, and the compression coefficient of the conductor is controlled within the range of 0.85-0.9;
    Step 2: Prepare the insulating shielding layer. Both the inner shielding layer and the insulating layer are extruded on the conductor by a steam continuous vulcanizing extruder. The inner shielding layer and the insulating layer adopt a high- temperature high-pressure vulcanization system, and 2,5-dimethyl-2,5-di(tert- butylperoxy)hexane is selected as the vulcanizing agent of the inner shielding layer and the insulating layer, the vulcanization temperature range is 165°C~175°C and the steam pressure range is 0.7-0.8MPa; the outer shielding layer is extruded on the insulating layer by a continuous steam vulcanizing extruder, and the outer shielding layer adopts the low-temperature low-pressure vulcanization system, and selects platinum vulcanizing agent, the vulcanization temperature range is 130°C-150°C, and the steam pressure range is 0.1-0.2MPa; Step 3: Prepare the composite shielding layer. Overlap with a layer of semi- conductive nylon tape and tinned wire braided layer, and wrap the semi-conductive nylon tape flatly on the insulating shielding layer; the lap wrapping rate is not less than 15%, and the tinned wire braiding density is not less than 80%; Step 4: Prepare the outer sheath. The outer sheath is made of silica rubber, and the outer sheath is extruded on the composite shielding layer by a steam continuous vulcanization extruder. The high-temperature high-pressure vulcanization system is adopted, the vulcanization temperature range is 165°C-175°C, and the steam pressure range is 0.7-0.75MP.
    Due to the adoption of the above technical solution, the invention has significant technical effects: it is suitable for using as AC rated voltage and fixed power transmission line or connecting cable for mobile electrical appliances. It has the characteristics of high-temperature resistance, radiation resistance, cold resistance, acid and alkali resistance, corrosive odor resistance, water resistance, etc. The cable has a flexible structure and is easy to lay with stable electrical performance under high temperature conditions, particularly outstanding anti-aging performance, and a long service life. It is widely used in manufacturing industries such as metallurgy, petrochemical industry and electric power.
    Description of the drawings Figure 1 is a schematic diagram of the structure of the invention.
    Figure 2 is a schematic diagram of the structure of the insulating layer.
    Figure 3 is a schematic diagram of the structure of the composite shielding layer
    The names of the parts indicated by the numbers in the drawings are as follows: 1 — conductor, 2 — insulating shielding layer, 3 — composite shielding layer, 4 — outer sheath, 5 — inner shielding layer, 6 — insulating layer, 7 — outer shielding layer, 8 — lapped covering.
    Description of preferred embodiments This will be further described in detail below in combination with the accompanying drawings and embodiments.
    Embodiment 1 A high-voltage silicone rubber flexible cable, as shown in Figures 1 to 3, includes a conductor 1 made of twisted copper wires. The outer wall of the conductor 1 is wrapped with a semi-conductive tape. The material of the conductor 1 is tinned copper wire. As the silicone rubber cable is generally used under the temperatures of 180°C or higher, the conductor material shall be tinned copper wire with excellent corrosion resistance and oxidation resistance. The conductor 1 is covered with an insulating shielding layer 2, a composite shielding layer 3 and an outer sheath 4 from inside to outside. The insulating shielding layer 2 includes an inner shielding layer 5, an insulating layer 6, and an outer shielding layer 7 from inside to outside. To improve the electrical insulation performance of the insulated core, semi-conductive silicone rubber is selected as the inner shielding layer 5 and the outer shielding layer 7. The inner shielding layer 5 and the insulating layer 6 adopt a low-temperature low-pressure vulcanization system, and the outer shielding layer 7 adopts a high-temperature high- pressure vulcanization system. The surface of the insulating shielding layer 2, the inner shielding layer 5 and the outer shielding layer 7 produced in this way is very smooth and flat, and the surface electric field distribution of the insulating shielding layer 2 is more uniform, thus improving the core electric field distribution, reducing partial discharge factors, prolonging the service life of the medium-voltage silicone rubber power cable and ensuring the long-term safe and stable operation of the cable. The composite shielding layer 3 is braided with semi-conductive nylon tape and tinned wires, which can effectively conduct leakage current, induced current, and shield electromagnetic interference, and ensure good flexibility of the cable. The composite shielding layer 3 is covered with a lapped covering 8. The lapped covering 8 is made of non-hygroscopic wrapping tape, and the outer sheath 4 is made of silicone rubber material. The heat resistance rating of the insulating shielding layer 2 is within the range of -60°~180°. Both the inner shielding layer 5 and the outer shielding layer 7 are made of semi-conductive silicon rubber, and the insulating layer 6 is made of silicon rubber insulating material.
    Embodiment 2 A high-voltage silicone rubber flexible cable, as shown in Figures 1 to 3. On 5 the basis of Embodiment 1, the outer sheath 4 is made of silicone rubber material, and the heat resistance rating of the outer sheath 4 is within the range of -60°~180°. The cable can still work normally and stably under high temperatures, low temperatures or harsher environment. It has good resistance to heat, cold, aging, ozone and oil, as well as excellent mechanical and physical properties.
    Embodiment 3 A high-voltage silicone rubber flexible cable, as shown in Figures 1 to 3. On the basis of Embodiment 1, the conductor 1 includes a plurality of conductive layers made of copper wires, the lay of the conductive layers is gradually reduced from inside to outside, and the adjacent conductive layers are twisted in opposite directions. To ensure the flexibility of the cable, the softness and flexure of the cable conductor must be improved. The structural design of the conductor largely determines this performance. The smaller the diameter of the single wires of the conductor, the better the flexibility. The adjacent conductive layers of the conductor are twisted in opposite directions, while it is ensured that each conductive layer has a smaller lay (the lay of the outermost layer is not more than 12 times, the layer second to the outermost layer is not more than 14 times, and so on) for better bending performance. At the same time, a nano-scale compaction mold is used. On the one hand, it compacts the stranded conductor to ensure that the conductor is round and compact; on the other hand, it can eliminate the burrs on the surface of the conductor to prevent the tip from discharging, improve the smoothness of the conductor surface, and make the electric field distribution on the conductor surface more uniform.
    A processing technology of high-voltage silicone rubber flexible cable, including the said high-voltage silicone rubber flexible cable, and further including the following process steps: Step 1: Strand the single wires first. After the stranding is completed, the stranded wires are twisted through regular twisting to form a conductor 1, and the compression coefficient of the conductor 1 is controlled with the range of 0.85-0.9; ensure that the conductor has outstanding stability and flexibility; the compression coefficient is controlled within the range of 0.85-0.9 to ensure that the surface of the conductor 1 is smooth, tight and free of burrs. The conductor 1 is also wrapped with a layer of semi-conductive nylon tape to ensure the conductor structure is tight and not loose; Step 2: Prepare the insulating shielding layer.
    Both the inner shielding layer and the insulating layer 6 are extruded on the conductor 1 by a steam continuous 5 vulcanizing extruder.
    The inner shielding layer 5 and the insulating layer 6 adopt a high-temperature high-pressure vulcanization system, and 2,5-dimethyl-2,5-di(tert- butylperoxy)hexane is selected as the vulcanizing agent of the inner shielding layer 5 and the insulating layer 6, the vulcanization temperature range is 165°C~175°C and the steam pressure range is 0.7-0.8MPa; under such conditions, the vulcanized silicone rubber has good scorchiness, there are no toxic products, the compression deformation of vulcanized rubber is low, and the elongation is high; in addition, 2,5- dimethyl-2,5-di(tert-butylperoxy)hexane is not affected by carbon black and can be used for extrusion and vulcanization of the semi-conductive layer; the outer shielding layer 7 is extruded on the insulating layer 6 by a continuous steam vulcanizing extruder, and the outer shielding layer 7 adopts the low-temperature low-pressure vulcanization system, and selects platinum vulcanizing agent, which has the features of fast molding and vulcanization, low molding temperature, low vulcanization temperature, etc.; the vulcanization temperature range is 130°C-150°C, and the steam pressure range is 0.1-0.2MPa; If the same vulcanization system is used for the first extrusion and the second extrusion, when the outer shielding layer 7 is extruded through the second extrusion, the inner shielding layer 5 and the insulating layer 6 extruded first are prone to over-vulcanization, resulting in embrittlement and cracking, and the impact on the performance of the product is also very significant; therefore, the product molded with the vulcanization system of this technology has excellent physical properties, stable dimensions and low shrinkage, and the tensile strength, tear resistance and resilience of the product can be greatly improved; the system with the vulcanization temperature above 150°C and the air pressure above 0.5MPa is regarded as a high-temperature high-pressure vulcanization system, otherwise, it is regarded as a low-temperature low-pressure vulcanization system.
    The inner shielding layer 5 and the insulating layer 6 adopt the high-temperature high-pressure vulcanization system, and the outer shielding layer 7 adopts the low-temperature low-pressure vulcanization system, which can vulcanize the silicone rubber to a great extent, ensuring that the molded product has good physical and dielectric properties;
    Step 3: Prepare the composite shielding layer.
    Overlap with a layer of semi- conductive nylon tape and tinned wire braided layer to prevent current leakage in the radial direction, ensure safe use, good electrical insulation performance, heat resistance and certain mechanical strength, and lap the semi-conductive nylon tape flatly on the insulating shielding layer 2; the lap wrapping rate is not less than 15%, and the tinned wire braiding density is not less than 80%, so as to ensure a uniform lay of braiding; Step 4: Prepare the outer sheath. The outer sheath 4 is made of silica rubber, and the outer sheath 4 is extruded on the composite shielding layer 3 by a steam continuous vulcanization extruder. The high-temperature high-pressure vulcanization system is adopted, the vulcanization temperature range is 165°C-175°C, and the steam pressure range is 0.7-0.75MP, so the produced silicone rubber has good mechanical properties. The high-voltage silicone rubber flexible cable produced with the said process has the following properties:
    1. The conductor has excellent electrical conductivity, and the measured resistance of the finished product is 0.105Q/km, which is much lower than the national standard requirement of 0.108Q/km.
    2. Excellent mechanical properties of the insulation and sheath, as shown by the parameters in the following table; Measu | Test Standard | Measured | Standard Test Item Unit red Met Value Value Value Value | hod Mechanical 1 properties before : GB/ aging
    T Minimum tensile | N/m
    1.1 5.0 7.6 295 strength m
    1.11 Elongation at
    1.2 % 150 250 150 310 break
    Mechanical 2 properties after aging in air oven zijnen | | IE | ee [AE [men [ee Minimum tensile
    2.2 | strength after Nm 4 6.1 5 6.5 aging m Minimum elongation at % 120 195 120 210 break after aging Thermal stretch le eee | | [=m wm [we [rem www - Mechanical N/m GB/ sE Ee safes Oe Maximum 1.21 elongation under | % 175 65 175 load Maximum elongation after | % 25 5 25 cooling Tear resistance JB/ Cel Ce a strength m 96.7 It can be seen from the above table that the insulating shielding layer 2 and the outer sheath 4 produced with this process have excellent dielectric and mechanical properties, which can resist high temperatures, low temperatures or harsher environmental conditions and work normally and stably within the temperature range of -60°C - 180°C.
    The finished cable does not break down when it is energized for 5 minutes at the voltage of 38.5kV, and the partial discharge does not exceed 200PC, while the partial discharge of similar high-voltage silicone rubber products in the industry exceeds the level of 2000PC. Such a low partial discharge of the high-voltage silicone rubber cable can ensure its long-term continuous and stable operation.
    In summary, the above embodiments are only preferred ones of this invention, and any equivalent changes and modifications made within the scope of the patent application of this invention shall fall within the scope of the patent of this invention.
    权利要求:
    Claims (7)
    [1]
    A silicone rubber flexible high voltage cable, characterized in that the cable comprises: - a conductor (1) made of twisted copper wires, the conductor (1) being made of tinned copper wire and the conductor (1) being successively covered from the inside out with an insulating shielding layer {2}, a composite shielding layer (3) and an outer shielding layer (4), the insulating shielding layer (2) being successively provided from the inside to the outside with an inner shielding layer (5), an insulating layer (6) and an outer shielding layer (7), the composite shielding layer (3) being woven of semiconductive nylon tape and tinned wire, the composite shielding layer (3) being coated with a winding layer (8) and the outer shielding layer (4) being made of silicone rubber material.
    [2]
    The silicone rubber flexible high voltage cable according to claim 1, wherein the insulating shield layer (2) has a temperature resistance of -60°C ~ 180°C.
    [3]
    The high voltage silicone rubber flexible cable according to claim 1, wherein the inner shielding layer (5) and the outer shielding layer (7) are both made of semiconductive silicone rubber.
    [4]
    The silicone rubber flexible high voltage cable according to claim 1, wherein the outer wall of the conductor (1) is wrapped with a semiconductive tape.
    [5]
    The high voltage silicone rubber flexible cable according to claim 1, wherein the outer shielding layer (4) is made of silicone rubber and the temperature resistance of the outer shielding layer (4) is -60°C~180°C.
    [6]
    The high voltage silicone rubber flexible cable according to claim 1, wherein the conductor (1) comprises a plurality of conductive layers made of copper wires, wherein the distance of the conductive layers from the conductive layers gradually decreases from the inside out, and the wire directions of adjacent conductive layers are opposite.
    [7]
    A method of manufacturing a silicone rubber flexible high voltage cable according to any one of claims 1 to 6, further comprising the following process steps:
    - twisting the single wires together, whereupon after the twisting is completed, the twisted wires are twisted by regular twisting to form a conductor (1) wherein the compaction coefficient of the conductor (1) is controlled to a range of 0 .85-0.9;
    - preparing an insulating layer, wherein the inner shielding layer (5) and the insulating layer (6) are both extruded onto the conductor (1) by a steam continuous vulcanizing extruder, wherein the inner shielding layer (5) and the insulating layer ( 6) using a high temperature, high pressure pressure vulcanization system, selecting 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane as the vulcanizing agent of the inner shielding layer (5) and the insulating layer (6), wherein the vulcanization temperature is 165°C to 175°C and the steam pressure is 0.7-0.8 MPa; wherein the outer shield layer (7) is extruded on the insulating layer (6) by a continuous steam vulcanization extruder, the outer shield layer (7) uses a low temperature, low pressure vulcanization system, and selects a platinum curing agent, wherein the vulcanization temperature is 130 °C-150°C and wherein the steam pressure is 0.1-0.2 MPa;
    - preparing a composite shielding layer by overlapping a layer of semiconductive nylon tape and a tinned wire braided layer, wherein the semiconductive nylon tape is wound flat on the insulating shielding layer (2), wherein the winding coverage percentage is not less than 15% and wherein the tinned wire braid density is not less than 80%;
    - preparing an outer shielding layer wherein the outer shielding layer (4) is made of silica rubber and wherein the outer shielding layer (4) is extruded onto the composite shielding layer (3) by means of a steam continuous vulcanization extruder, and wherein a vulcanization system for high temperature and high pressure has been used, the vulcanization temperature is 165°C to 175°C, and the steam pressure is 0.7-0.75 MP.
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    同族专利:
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    CN111785420A|2020-10-16|
    引用文献:
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    CN112509742A|2020-12-21|2021-03-16|安徽世林照明股份有限公司|Multi-layer winding and wrapping type electric wire and processing technology thereof|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN202010474581.8A|CN111785420A|2020-05-29|2020-05-29|High-voltage silicon rubber flexible cable and processing technology thereof|
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