CN116978615B - Insulated power cable - Google Patents

Insulated power cable Download PDF

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Publication number
CN116978615B
CN116978615B CN202311059265.4A CN202311059265A CN116978615B CN 116978615 B CN116978615 B CN 116978615B CN 202311059265 A CN202311059265 A CN 202311059265A CN 116978615 B CN116978615 B CN 116978615B
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CN
China
Prior art keywords
fibers
outer sheath
cable
filler
shielding layer
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CN202311059265.4A
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Chinese (zh)
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CN116978615A (en
Inventor
储冲
宋会芳
陆轶群
储苏
崔信芳
张雯雯
沈吉
蒋佳武
陈刚
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Wuxi Xinyu Cable Ltd
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Wuxi Xinyu Cable Ltd
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Priority to CN202311059265.4A priority Critical patent/CN116978615B/en
Publication of CN116978615A publication Critical patent/CN116978615A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1875—Multi-layer sheaths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1875—Multi-layer sheaths
    • H01B7/188—Inter-layer adherence promoting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

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  • Insulated Conductors (AREA)

Abstract

The invention relates to an insulated power cable, which comprises a filler, a conductor penetrating through the filler, an insulating layer coating the conductor, a shielding layer coating the filler and an outer sheath coating the shielding layer, wherein the insulating layer is arranged on the inner side of the conductor; the insulating layer contacts the filler; fibers are deposited in the outer sheath in the same direction; the deposition density of the fibers gradually decreases from inside to outside; burrs are formed on the inner surfaces of the outer jackets, protruding out of the outer jackets, of the fibers; the shielding layer abuts against the burr. The problem of in the current scheme connection between the material in the cable is infirm, leads to the cable unable great mechanical force of bearing, if form the protection to the cable through the steel tape armor and can lead to the fact the bending property of cable to influence is solved.

Description

Insulated power cable
Technical Field
The invention relates to the field of cables, in particular to an insulated power cable.
Background
The power cable is a cable for transmitting and distributing electric energy, and is commonly used for an urban underground power grid, an outgoing line of a power station, an internal power supply of an industrial and mining enterprise, and an underwater power transmission line crossing the river and the sea. The cable has wider application field and poorer application environment.
The traditional cable adopts an insulating layer to cover conductors to form wires, the wires are filled, then wrapping tape is wound, and finally an outer sheath is extruded. The connection between materials in the traditional cable is not firm, and even the electric wires can be pulled out from the cable, so that the cable cannot bear large mechanical force.
Therefore, the existing scheme adds a steel tape armor layer between the belting and the outer sheath on the basis of the traditional cable. The cable is protected by the steel tape armouring layer, but this has an influence on the bending properties of the cable. How to solve this problem becomes important.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an insulated power cable, so as to solve the problem that in the prior art, the cable cannot withstand a large mechanical force due to weak connection between materials in the cable, and if the cable is protected by a steel tape armor layer, the bending performance of the cable is affected.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an insulated power cable;
the shielding device comprises a filler, a conductor penetrating through the filler, an insulating layer coating the conductor, a shielding layer coating the filler and an outer sheath coating the shielding layer; the insulating layer contacts the filler; fibers are deposited in the outer sheath in the same direction; the deposition density of the fibers gradually decreases from inside to outside; burrs are formed on the inner surfaces of the outer jackets, protruding out of the outer jackets, of the fibers; the shielding layer abuts against the burr.
The further technical scheme is as follows: a net layer is wound on the filler; the shielding layer hooks the mesh layer.
The further technical scheme is as follows: the shielding layer comprises a plurality of strands of shielding wires woven around the filler; the shielding wires are provided with notches at intervals; the cuts on the adjacent shielding wires are staggered; the cuts hook the mesh layer.
The further technical scheme is as follows: forming an included angle A between the fibers protruding from the inner surface of the outer sheath and the fibers deposited in the outer sheath; the included angle A is more than or equal to 5 degrees and less than or equal to 15 degrees.
The further technical scheme is as follows: the fiber diameter D is: 8-12 μm; wherein: the fiber length L1, L1 deposited within the outer sheath is: 3-3.5mm; the fiber length L2 protruding from the inner surface of the outer sheath, (L2-L1)/L1 is: 40-65%.
The further technical scheme is as follows: the outer sheath comprises the following production process steps:
a first production step: cleaning and drying basalt fibers, and then performing low-temperature plasma treatment for a plurality of times; the plasma power is: 350W; the moving speed of the ion handle is as follows: 12-14mm/s;
and a second production step: spraying phenolic resin on basalt fibers, and then curing and drying; curing temperature: 140-145 ℃; curing time: 50-60 min;
and a third production step: adopting aluminum-zirconium coupling agent solution to soak basalt fibers, and then drying; soaking time: 2h; the drying temperature is 120-125 ℃; drying time: 12-15min.
The further technical scheme is as follows: when the outer sheath is extruded, the two sides of the die head of the extruder vibrate; the vibration frequency of one side of the extruder die head, which is close to the cable moving direction, is as follows: f1; the vibration frequency of one side of the extruder die head, which is close to the cable moving-out direction, is as follows: f2; wherein: f1 < f2.
The further technical scheme is as follows: the length of the extruder die head contact cable is L3; the distance from the outlet of the extruder to the die head of the extruder is L4; L4/L3 is more than 10; an included angle B is formed between one side of the extruder die head, which is close to the moving direction of the cable, and the axis of the moving direction of the cable; 140 DEG < B < 155 deg.
Compared with the prior art, the invention has the following beneficial technical effects: (1) Because the fibers are deposited in the outer sheath, the fibers play a role in structural reinforcement of the outer sheath, and the outer sheath is prevented from being broken and cracked; simultaneously, as the deposition density of the fibers is gradually reduced from inside to outside, the texture of the inner surface position of the outer sheath is harder, and the texture of the outer surface position of the outer sheath is softer; meanwhile, as part of the fibers can incline, the support of the inner surface position of the fiber outer sheath is weakened, and the toughness of the outer sheath is ensured; (2) The net layer plays a role in protecting the insulating layer and the filler, and the shielding layer is hooked on the net layer through the shielding layer, so that the shielding layer can be firmly wound on the net layer; because the conductor, the insulating layer and the filler are wound by the net layer, the conductor, the insulating layer, the filler and the net layer can be taken as a whole, and the net layer is hooked by the shielding layer, so that the shielding layer can be firmly coated on the whole, and the phenomenon of loosening inside the insulating power cable is avoided; (3) After the shielding wire is braided after being provided with the notch, the notch of the shielding wire is deepened, so that the shielding wire forms a tilted edge; the shielding layer is formed by braiding a plurality of strands of shielding wires, and the notches on the shielding wires are arranged in a staggered manner through the notches on the adjacent shielding wires, so that the notches on the shielding wires are positioned at different positions of the shielding layer, and the situation that the notches on the shielding wires are positioned at the same position of the shielding layer to break the shielding layer is avoided; after the multi-strand shielding wire is woven around the filler, the raised edges of the shielding wire hook the net layer, so that the shielding layer firmly covers the filler; (4) The inclination angle is controlled within a reasonable range, so that interference influence among fibers is avoided, the fatigue resistance of the outer sheath can be improved by the fibers, cracks and breakage of the outer sheath are prevented, and meanwhile, the tensile strength of the power cable is improved; the shielding layer is abutted against the burrs, and the burrs cannot penetrate into the shielding layer, so that the outer sheath and the shielding layer can be firmly connected; (5) Because the contact angle of the basalt fiber is an acute angle, more polyvinyl chloride is contacted with the basalt fiber, and meanwhile, the blocky phenolic resin structure is formed at the non-protruding position and the protruding position of the surface of the basalt fiber, so that the blocky phenolic resin structure is in staggered distribution; when basalt fibers are deposited in polyvinyl chloride, the polyvinyl chloride can be completely coated and adhered on the basalt fibers; the protruding part of the fiber is adhered with polyvinyl chloride, so that a conical burr is formed, and the burr abuts against the shielding layer but does not penetrate into the shielding layer; meanwhile, the polyvinyl chloride and basalt fibers have strong adhesion, so that the fibers form an effective structural reinforcing effect on the outer sheath; the fibers deposited and arranged at the position of the outer sheath close to the inner surface are more, the polyvinyl chloride and basalt fibers form effective adhesion, and the basalt fibers cannot fall off; (6) The vibration frequency f1 and the vibration frequency f2 have a difference value, and the greater the difference value is, the faster the fiber moves in the polyvinyl chloride; the vibration frequency f1 and the vibration frequency f2 are controlled, so that when the fiber and the polyvinyl chloride are coated on the cable to form an outer sheath, the fiber can just form a deposition density which gradually decreases from inside to outside; (7) The length L2 of the fiber protruding from the inner surface of the outer sheath is larger than the length L1 of the fiber deposited in the outer sheath, so that the weight of the fiber protruding from the inner surface of the outer sheath is heavier, and a certain length L3 is also required for ensuring that the fiber can change direction because of the longer length L2; the included angle B is an obtuse angle, the weight of the fiber protruding out of the inner surface of the outer sheath is heavy, and when the direction of the fiber is changed due to inertia, the fiber protrudes out of the polyvinyl chloride for a part of distance, and the protruding part of distance finally forms conical burrs.
Drawings
Fig. 1 shows a schematic cross-sectional view of an insulated power cable according to an embodiment of the invention.
Fig. 2 shows an enlarged view at a in fig. 1.
Fig. 3 shows a schematic view of the position of the included angle B during extrusion according to an embodiment of the present invention.
Fig. 4 shows a schematic cross-sectional view of a shielding layer and an outer jacket of an embodiment of the present invention.
The reference numerals in the drawings: 1. a filler; 2. a conductor; 3. an insulating layer; 4. a shielding layer; 5. an outer sheath; 51. a fiber; 52. burrs; 6. a mesh layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following more detailed description of the device according to the present invention is given with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for the purpose of facilitating and clearly aiding in the description of embodiments of the invention. For a better understanding of the invention with objects, features and advantages, refer to the drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that any modifications, changes in the proportions, or adjustments of the sizes of structures, proportions, or otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or essential characteristics thereof.
Fig. 1 shows a schematic cross-sectional view of an insulated power cable according to an embodiment of the invention. Fig. 2 shows an enlarged view at a in fig. 1. Fig. 3 shows a schematic view of the position of the included angle B during extrusion according to an embodiment of the present invention. Fig. 4 shows a schematic cross-sectional view of a shielding layer and an outer jacket of an embodiment of the present invention. As shown in connection with fig. 1, 2, 3 and 4, the present invention discloses an insulated power cable.
The insulated power cable includes a filler 1, a conductor 2 penetrating inside the filler 1, an insulating layer 3 covering the conductor 2, a shielding layer 4 covering the filler 1, and an outer sheath 5 covering the shielding layer 4. The insulating layer 3 contacts the filler 1. Fibers 51 are deposited in the same direction within the outer sheath 5. The deposition density of the fibers 51 gradually decreases from the inside to the outside. The fibers 51 protrude from the inner surface of the outer sheath 5 to form burrs 52. The shielding layer 4 abuts the burr 52.
Preferably, the conductor 2 is made of copper. Preferably, the material of the insulating layer 3 is cross-linked polyethylene. The insulating layer 3 covers the conductor 2 to form an electric wire. A plurality of wires are placed in the filler 1. The filler 1, the conductor 2 and the insulating layer 3 are placed inside the shielding layer 4, the filler 1 contacting the inner surface of the shielding layer 4. The shielding layer 4 is placed inside the outer sheath 5, and the outer surface of the shielding layer 4 contacts the inner surface of the outer sheath 5. Preferably, the number of fibers 51 is plural. Preferably, the outer sheath 5 is made of polyvinyl chloride. Preferably, the fiber 51 is basalt fiber. The insulated power cable mixes basalt fibers in a polyvinyl chloride material before extruding the outer sheath 5. After extrusion of the outer sheath 5, the fibers 51 are aligned in the same direction within the outer sheath 5. The density of the deposited arrangement of fibers 51 within the outer sheath 5 varies with higher density in the outer sheath 5 near the inner surface and lower density in the outer sheath 5 near the outer surface. The portion of the fibers 51 at a higher density in the outer sheath 5 is inclined such that one end of the fibers 51 protrudes inward toward the inner surface of the outer sheath 5, and the fibers 51 form burrs 52 on the inner surface of the outer sheath 5. The shielding layer 4 abuts against the burrs 52, the shielding layer 4 is limited by the burrs 52, and abrasion between the shielding layer 4 and the outer sheath 5 is avoided.
Because the fibers 51 are deposited in the outer sheath 5, the fibers 51 play a role in structurally reinforcing the outer sheath 5, and prevent the outer sheath 5 from breaking and cracking. At the same time, the deposition density of the fibers 51 gradually decreases from inside to outside, so that the texture of the inner surface position of the outer sheath 5 is harder, and the texture of the outer surface position of the outer sheath 5 is softer. At the same time, as a part of the fibers 51 incline, the support of the inner surface of the outer sheath 5 of the fibers 51 is weakened, and the toughness of the outer sheath 5 is ensured.
The filler 1 is wound with a mesh layer 6. The shielding layer 4 hooks the mesh layer 6.
Preferably, the web layer 6 is a fleece. Preferably, the web is in the form of a strip. The mesh layer 6 is spirally wound on the filler 1. Binding and winding of the filler 1 are achieved through winding of the net layer 6, so that gaps of the filler 1 are compact. After the filler 1 is wound by the mesh layer 6, the conductor 2, the insulating layer 3, the filler 1 and the mesh layer 6 as a whole have better toughness.
Meanwhile, the net layer 6 plays a role in protecting the insulating layer 3 and the filler 1, and the net layer 6 is hooked through the shielding layer 4, so that the shielding layer 4 can be firmly wound on the net layer 6. Because conductor 2, insulating layer 3 and filler 1 are twined by stratum reticulare 6, conductor 2, insulating layer 3, filler 1 and stratum reticulare 6 can regard as a whole, hook stratum reticulare 6 through shielding layer 4 for shielding layer 4 can firm cladding be on this whole, avoids the inside loose phenomenon that appears of insulating power cable.
If the shielding layer 4 is directly hooked on the filler 1, the filler 1 is torn by the shielding layer 4 because the filler 1 is filled between the wires, or the filler 1 is pulled to shift, the insulating layer 3 is exposed by the filler 1, and the conductor 2 may be exposed by abrasion of the insulating layer 3 and the shielding layer 4.
The shielding layer 4 comprises a plurality of strands of shielding wires braided around the filler 1. The shielding wires are provided with notches at intervals. The cuts on adjacent shielding wires are staggered. The cuts hook the mesh layer 6.
Preferably, the shielding wire is made of copper. The copper material is softer, and after the incision is formed in the shielding wire, the incision of the shielding wire is deepened after the shielding wire is woven, so that the shielding wire forms a tilted edge. The shielding layer 4 is formed by weaving a plurality of strands of shielding wires, and through staggered arrangement of the incisions on the adjacent shielding wires, the incisions on the shielding wires are positioned at different positions of the shielding layer 4, so that the incisions on the shielding wires are prevented from being positioned at the same position of the shielding layer 4, and the shielding layer 4 is broken. After the multi-strand shielding wire is woven around the filler 1, the raised edges of the shielding wire hook the net layer 6, so that the shielding layer 4 can firmly cover the filler 1.
The fibers 51 protruding from the inner surface of the outer sheath 5 form an angle a with the fibers 51 deposited in the outer sheath 5. The included angle A is more than or equal to 5 degrees and less than or equal to 15 degrees.
In order for the fibers 51 to protrude from the inner surface of the outer sheath 5 to form burrs 52, the fibers 51 protruding from the inner surface of the outer sheath 5 need to be inclined, and the angle of inclination needs to be controlled between 5 ° and 15 °.
If the inclination angle of the fiber 51 is larger than the range of the included angle a, the surrounding fiber 51 will be influenced, the fiber 51 will touch and push the surrounding fiber 51 outwards, and the flow path of the surrounding fiber 51 will be changed, so that the distribution situation of the fiber 51 will be changed. Meanwhile, the fiber 51 also protrudes out of the inner surface of the outer sheath 5 by a larger distance, so that the distance of the burr 52 is longer, the burr 52 can penetrate into the shielding layer 4 when the shielding layer 4 abuts against the burr 52, the power cable can be bent or folded in the long-term use process of the power cable, and the burr 52 can further extend into the penetrating filler 1 and the insulating layer 3, so that the conductor 2 is damaged.
If the inclination angle of the fiber 51 is further increased, the fiber 51 protrudes from the outer surface of the outer sheath 5, so that the surface quality of the power cable is poor. If the number of the fibers 51 increases, the polyvinyl chloride portion of the outer sheath 5 is discontinuous, and the outer sheath 5 is easily broken.
If the inclination angle of the fiber 51 is smaller than the range of the included angle a, the fiber 51 cannot protrude from the inner surface of the outer sheath 5 to form the burr 52 to abut against the shielding layer 4, and thus the outer sheath 5 and the shielding layer 4 cannot be firmly connected.
The inclination angle needs to be controlled between 5 ° and 15 °, at which time the protruding portion of the fiber 51 is bonded with polyvinyl chloride and the outer sheath 5, which solidifies to form the tapered burr 52. The burrs 52 do not protrude too much into the shielding layer 4, and the power cable is bent or folded during long-term use of the power cable, but since the burrs 52 are tapered, the burrs 52 do not penetrate into the shielding layer 4.
Through controlling inclination in reasonable within range for can not produce the interference influence between the fibre 51, the fibre 51 can improve the fatigue resistance of oversheath 5, prevents that oversheath 5 from appearing crackle and fracture, has improved power cable's tensile strength simultaneously. By the shielding layer 4 abutting the burrs 52, the burrs 52 do not penetrate the shielding layer 4 so that a firm connection between the outer jacket 5 and the shielding layer 4 is possible.
The fiber 51 diameter D is: 8-12 μm. Wherein: the length L1 of the fibers 51 deposited in the outer sheath 5, L1 is: 3-3.5mm. The length L2 of the fiber 51 protruding from the inner surface of the outer sheath 5, (L2-L1)/L1 is: 40-65%.
Since the outer sheath 5 is extruded by using vibration of both sides of the die head of the extruder, the distribution of the fibers 51 is changed, and the fibers 51 having a high vibration frequency are moved to a low vibration frequency. The length of the fibers 51 deposited in the outer sheath 5 is short and the length of the fibers 51 protruding from the inner surface of the outer sheath 5 is long. The longer length fibers 51 weigh more during movement and the resistance that the longer length fibers 51 need to overcome during movement increases accordingly, so that the movement speed of the longer length fibers 51 is slower than the movement speed of the shorter length fibers 51.
Due to the slower speed of movement of the longer length fibers 51, the longer length fibers 51 will be located a distance from the inner surface of the outer sheath 5, which also leaves room for the tilting of the longer length fibers 51 so that the longer length fibers 51 do not extend a longer distance from the inner surface of the outer sheath 5 after tilting.
The outer sheath 5 has the fiber 51 produced by the following steps:
a first production step: and cleaning and drying the basalt fiber, and then performing low-temperature plasma treatment for a plurality of times. The plasma power is: 350W. The moving speed of the ion handle is as follows: 12-14mm/s.
And a second production step: spraying phenolic resin on basalt fiber, and then curing and drying. Curing temperature: 140-145 ℃. Curing time: 50-60 min.
And a third production step: and (3) soaking basalt fibers in an aluminum-zirconium coupling agent solution, and then drying. Soaking time: 2h. The drying temperature is 120-125 ℃. Drying time: 12-15min.
The material of the fiber 51 in the outer sheath 5 is basalt fiber.
In the first production step: the fibers 51 are subjected to low temperature plasma treatment to form protrusions on the surface of the basalt fibers. The number of times of low-temperature plasma treatment is controlled between 7 and 9 times. When basalt fiber is processed by low-temperature plasma, the surface of the basalt fiber starts to be raised, the raised is distributed on the surface of the basalt fiber in a large range by controlling the processing times, and etching does not occur on the surface of the basalt fiber. And the contact angle of the basalt fiber surface subjected to multiple times of low-temperature plasma treatment starts to change, and the contact angle of the basalt fiber is changed from an obtuse angle to an acute angle, so that the contact area of the basalt fiber with polyvinyl chloride is increased, and the adhesive property of the basalt fiber is better.
In the second production step: after spraying phenolic resin on basalt fibers, the basalt fibers are coated with the phenolic resin. Since basalt fibers are not smooth, but are raised, such raised increases the amount of phenolic resin that adheres.
In the third production step: the basalt fiber is subjected to low-temperature plasma treatment for a plurality of times, so that the adsorption quantity of the basalt fiber to the aluminum-zirconium coupling agent solution is increased. After the basalt fiber is immersed in the aluminum zirconium coupling agent solution, a blocky phenolic resin structure is formed on the surface of the basalt fiber. Because the contact angle of the basalt fiber is an acute angle, more polyvinyl chloride is contacted with the basalt fiber, and meanwhile, the blocky phenolic resin structure is formed at the non-convex position and the convex position of the surface of the basalt fiber, so that the blocky phenolic resin structure is distributed in a staggered manner. When basalt fibers are deposited in polyvinyl chloride, the polyvinyl chloride can be completely coated and adhered on the basalt fibers.
This causes the protruding portion of the fibers 51 to adhere to the polyvinyl chloride, thereby forming a tapered burr 52 such that the burr 52 abuts the shield layer 4 but does not penetrate the shield layer 4. Meanwhile, the polyvinyl chloride and basalt fibers have strong adhesion, so that the fibers 51 form an effective structural reinforcing effect on the outer sheath 5. And more fibers 51 are deposited and arranged on the position, close to the inner surface, of the outer sheath 5, so that the polyvinyl chloride and basalt fibers form effective adhesion, and the basalt fibers cannot fall off.
When the outer sheath 5 is extruded, both sides of the die head of the extruder vibrate. The vibration frequency of one side of the extruder die head, which is close to the cable moving direction, is as follows: f1. the vibration frequency of one side of the extruder die head, which is close to the cable moving-out direction, is as follows: f2. wherein: f1 < f2.
The inlet of the extruder die is an outlet that communicates with the extruder and the cable moves through the outlet of the extruder die. The polyvinyl chloride flows out of the extruder, the fibers 51 are placed into the polyvinyl chloride from the extruder die head, and the fibers 51 are moved in the polyvinyl chloride by vibration to complete the deposition arrangement.
The difference between the vibration frequency f1 and the vibration frequency f2 is larger, and the higher the difference is, the faster the fiber 51 moves in the polyvinyl chloride. The vibration frequency f1 and the vibration frequency f2 need to be controlled, so that when the fiber 51 and the polyvinyl chloride are coated on the cable to form the outer sheath 5, the fiber 51 can just form the deposition density which gradually decreases from inside to outside.
If the difference between the vibration frequency f1 and the vibration frequency f2 is large, the fiber 51 moves along the polyvinyl chloride to form a deposit gradually decreasing from the side with the large vibration frequency to the side with the small vibration frequency when the fiber 51 and the polyvinyl chloride flow along the die head of the extruder. But at this time, the fiber 51 and the polyvinyl chloride are not close to the cable, the fiber 51 continues to move along the polyvinyl chloride, the fiber 51 forms a deposit which gradually increases from the side with the large vibration frequency to the side with the small vibration frequency, and finally the fiber 51 forms a deposit density which gradually increases from inside to outside.
If the difference between the vibration frequency f1 and the vibration frequency f2 is smaller, when the fiber 51 and the polyvinyl chloride flow along the die head of the extruder, the fiber 51 does not form deposition gradually reduced from the side with the larger vibration frequency to the side with the smaller vibration frequency along the inner movement of the polyvinyl chloride, and the fiber 51 and the polyvinyl chloride are coated on the cable to form the outer sheath 5, so that the fiber 51 cannot form effective support for the outer sheath 5.
The extruder die contacted the cable for a length L3. The distance from the extruder outlet to the extruder die was L4. L4/L3 > 10. An included angle B is formed between one side, close to the moving direction of the cable, of the extruder die head and the axis of the moving direction of the cable. The included angle B is less than 145 DEG and 130 DEG.
Distance L4 is the distance that the fiber 51 and polyvinyl chloride flow along the extruder die. The length L3 is the length of the fiber 51 and polyvinyl chloride coated on the cable to change the direction of movement. The value of the distance L4 needs to be limited so that the fibers 51 and the polyvinyl chloride have a sufficient movement distribution time for the fibers 51 during the flow. The value of the length L3 needs to be limited so that there is sufficient space for the fiber 51 to change the direction of movement when the fiber 51 and the polyvinyl chloride are wrapped around the cable.
The angle a is formed when the fiber 51 changes its direction of movement during extrusion, in order to control the angle a to: included angle a is 5 ° or more and 15 ° or less to form tapered burr 52, included angle B needs to be controlled to be: 140 DEG < B < 155 deg.
Since the length L2 of the fibers 51 protruding from the inner surface of the outer sheath 5 is larger than the length L1 of the fibers 51 deposited in the outer sheath 5, the weight of the fibers 51 protruding from the inner surface of the outer sheath 5 is heavy, and since the length L2 is long, a certain length L3 is also required to ensure that the fibers 51 can change direction.
The included angle B is an obtuse angle, the weight of the fibers 51 protruding from the inner surface of the outer sheath 5 is heavy, and when the direction of the fibers 51 is changed due to inertia, the fibers 51 protrude a part of the distance of polyvinyl chloride, and the protruding part of the distance finally forms a tapered burr 52.
The distance of the protrusion is determined by the magnitude of the inertia, and the greater the inertia, the longer the distance of the protrusion. The smaller the inertia, the shorter the protruding distance. In order to ensure that the fibres 51 and the polyvinyl chloride can be smoothly coated to form the outer sheath 5, the direction of flow of the fibres 51 and the polyvinyl chloride and the direction of movement of the cable are not opposite. At maximum inertia, the direction of flow of the fibres 51 and polyvinyl chloride and the direction of movement of the cable are perpendicular, with an angle B of 90 °. Since the fiber 51 and the polyvinyl chloride flow and finally cover the cable, the fiber 51 and the polyvinyl chloride flow direction and the cable movement direction are not parallel, so the included angle B cannot reach 180 °.
So that when the angle B is 90 deg., the fibers 51 protrude the longest distance from the polyvinyl chloride, and the resulting burrs 52 may penetrate the shielding layer 4. When the included angle B gradually approaches 180 °, the protruding polyvinyl chloride distance of the fiber 51 gradually becomes shorter, the formed burr 52 gradually cannot contact the shielding layer 4 and form abutment, and even the fiber 51 cannot protrude polyvinyl chloride after tilting, so that the burr 52 cannot be formed, and finally, the outer sheath 5 cannot firmly cover the shielding layer 4. When 130 ° < included angle B < 145 °, the burrs 52 formed can abut against the shielding layer 4 and do not penetrate the shielding layer 4.
The conductor 2, the insulating layer 3 and the filler 1 are wound to form a whole through the mesh layer 6, and the shielding layer 4 can be hooked on the mesh layer 6, so that the shielding layer 4 can firmly wrap the filler 1 without damaging the filler 1. The burrs 52 are abutted against the shielding layer 4 and do not penetrate into the shielding layer 4, so that the outer sheath 5 can firmly cover the shielding layer 4, the inter-material structure of the insulated power cable is firmly and compactly connected, and the capability of the insulated power cable for bearing mechanical force is improved. By depositing the fibers 51 at a density that gradually decreases from the inside to the outside, the fibers 51 form a protection for the insulated power cable without degrading the bending properties of the insulated power cable.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (6)

1. An insulated power cable, characterized by: comprises a filler (1), a conductor (2) penetrating through the filler (1), an insulating layer (3) coating the conductor (2), a shielding layer (4) coating the filler (1) and an outer sheath (5) coating the shielding layer (4); the insulating layer (3) contacts the filler (1); fibers (51) are deposited in the outer sheath (5) in the same direction; the deposition density of the fibers (51) gradually decreases from inside to outside; the fibers (51) protrude out of the inner surface of the outer sheath (5) to form burrs (52); -the shielding layer (4) is against the burr (52);
a net layer (6) is wound on the filler (1); the shielding layer (4) hooks the net layer (6);
-the shielding layer (4) comprises a plurality of strands of shielding wires braided around the filler (1); the shielding wires are provided with notches at intervals; the cuts on the adjacent shielding wires are staggered; the cut hooks the mesh layer (6).
2. The insulated power cable of claim 1, wherein: -forming an angle a between said fibers (51) protruding from the inner surface of said outer sheath (5) and said fibers (51) deposited inside said outer sheath (5); the included angle A is more than or equal to 5 degrees and less than or equal to 15 degrees.
3. The insulated power cable of claim 2, wherein: the diameter D of the fiber (51) is: 8-12 μm; wherein: -the length L1 of the fibers (51) deposited inside the outer sheath (5), L1 being: 3-3.5mm; -the length L2 of the fibers (51) protruding from the inner surface of the outer sheath (5), (L2-L1)/L1 being: 40-65%.
4. The insulated power cable of claim 1, wherein: the fiber (51) in the outer sheath (5) adopts the following production process steps:
a first production step: cleaning and drying basalt fibers, and then performing low-temperature plasma treatment for a plurality of times; the plasma power is: 350W; the moving speed of the ion handle is as follows: 12-14mm/s;
and a second production step: spraying phenolic resin on basalt fibers, and then curing and drying; curing temperature: 140-145 ℃; curing time: 50-60 min;
and a third production step: adopting aluminum-zirconium coupling agent solution to soak basalt fibers, and then drying; soaking time: 2h; the drying temperature is 120-125 ℃; drying time: 12-15min.
5. The insulated power cable of claim 1, wherein: when the outer sheath (5) is extruded, the two sides of the die head of the extruder vibrate; the vibration frequency of one side of the extruder die head, which is close to the cable moving direction, is as follows: f1; the vibration frequency of one side of the extruder die head, which is close to the cable moving-out direction, is as follows: f2; wherein: f1 < f2.
6. The insulated power cable of claim 5, wherein: the length of the extruder die head contact cable is L3; the distance from the outlet of the extruder to the die head of the extruder is L4; L4/L3 is more than 10; an included angle B is formed between one side of the extruder die head, which is close to the moving direction of the cable, and the axis of the moving direction of the cable; 140 DEG < B < 155 deg.
CN202311059265.4A 2023-08-22 2023-08-22 Insulated power cable Active CN116978615B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206532627U (en) * 2017-03-14 2017-09-29 太阳电线(东莞)有限公司 A kind of shielding wire cable
CN209607472U (en) * 2019-03-11 2019-11-08 安徽吉安特种线缆制造有限公司 A kind of fire-alarming cable
CN209747160U (en) * 2019-05-22 2019-12-06 安徽凌宇电缆科技有限公司 anti-interference, flame-retardant and load-monitoring type mining medium-voltage rubber jacketed flexible cable
CN110911040A (en) * 2019-12-25 2020-03-24 江苏江扬线缆有限公司 Cable for new energy automobile and preparation method thereof
WO2022215826A1 (en) * 2021-04-05 2022-10-13 엘에스전선 주식회사 Power cable system having different-type conductor junction, and power cable connection method using different-type conductors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206532627U (en) * 2017-03-14 2017-09-29 太阳电线(东莞)有限公司 A kind of shielding wire cable
CN209607472U (en) * 2019-03-11 2019-11-08 安徽吉安特种线缆制造有限公司 A kind of fire-alarming cable
CN209747160U (en) * 2019-05-22 2019-12-06 安徽凌宇电缆科技有限公司 anti-interference, flame-retardant and load-monitoring type mining medium-voltage rubber jacketed flexible cable
CN110911040A (en) * 2019-12-25 2020-03-24 江苏江扬线缆有限公司 Cable for new energy automobile and preparation method thereof
WO2022215826A1 (en) * 2021-04-05 2022-10-13 엘에스전선 주식회사 Power cable system having different-type conductor junction, and power cable connection method using different-type conductors

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