CN111584145B - B1-grade flame-retardant cross-linked polyethylene insulated polyolefin sheath power cable and preparation method thereof - Google Patents
B1-grade flame-retardant cross-linked polyethylene insulated polyolefin sheath power cable and preparation method thereof Download PDFInfo
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- CN111584145B CN111584145B CN202010457624.1A CN202010457624A CN111584145B CN 111584145 B CN111584145 B CN 111584145B CN 202010457624 A CN202010457624 A CN 202010457624A CN 111584145 B CN111584145 B CN 111584145B
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- 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
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
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Abstract
The invention discloses a B1-grade flame-retardant cross-linked polyethylene insulated polyolefin sheath power cable and a preparation method thereof, belonging to the technical field of wires and cables, and comprising a polyethylene outer sheath, an armored cavity, a protective sheath, an outer ring, a driving ring, a core ring and an insulating sheath, wherein the B1-grade flame-retardant cross-linked polyethylene insulated polyolefin sheath power cable and the preparation method thereof are characterized in that the protective sheath with an oxygen-isolating layer is additionally arranged, the inner ring is sleeved with the driving ring carrying the core ring, the core ring is internally provided with a frame ring structure for supporting the inside, and is internally filled with an expanded graphite compression plate which expands when heated and is matched with meshes of the core ring to release and isolate air, the flame-retardant initiative is good, the filling effect is stable and nondestructive, the using effect of the power cable is guaranteed to the maximum extent, the inner sheath is divided into four linings, a complete circular structure is combined, and the four linings are all filled with the flame-retardant structure, and the flame retardant rubber can be blocked when in combustion, so that the interference to the power cable is reduced to the maximum extent.
Description
Technical Field
The invention relates to the technical field of electric wires and cables, in particular to a B1-grade flame-retardant cross-linked polyethylene insulated polyolefin sheath power cable and a preparation method thereof.
Background
The cable is generally composed of several or several groups of wires, and the basic structure of the cable is generally composed of several parts, such as a cable core, a reinforcing steel wire, a filler, a sheath and the like.
The power cable is a category of cables, is used for transmitting and distributing electric energy, is commonly used for urban underground power grids, power station leading-out lines, power supply inside industrial and mining enterprises and transmission lines under river-crossing seawater, and has a gradually increasing proportion in the power line. Power cables are cable products used in the trunk lines of power systems to transmit and distribute high power electrical energy, including various voltage classes, 1-500KV and above, and various insulated power cables.
It can be classified into medium and low voltage power cables, high voltage cables, ultra high voltage cables and extra high voltage cables according to voltage class, and can be classified into alternating current cables and direct current cables according to current system.
Important public places such as large-scale meeting places, office buildings, hotels, hospitals, subway stations and the like all need certain viewpoint requirements under the condition of fire, normal power supply of power cables, uninterrupted power supply of various control signals and alarm signals are guaranteed, and valuable time is provided for escape, automatic alarm, starting of fire-fighting facilities, rescue and use of emergency equipment.
Along with the development of cable trade, power cable's application range is extensive day by day, but power cable's inside mode of reinforceing still is given first place to add the armor structure, it is comparatively single, and when meeting outer high temperature burning condition, the internal conductor combination is in the same place, the condition of damage can appear, the mutual interference condition is serious, and fire-retardant mode is taken advantage of self material characteristic or add passive fire-retardant material and is given first place to, self material fire-retardant characteristic can appear polluting, and the flame retardant efficiency who adds passive fire-retardant material is not good, these all produce negative effects to power cable's flame retardant efficiency.
Disclosure of Invention
The invention aims to provide a B1-grade flame-retardant cross-linked polyethylene insulated polyolefin sheath power cable and a preparation method thereof, and aims to solve the problems that along with the development of the cable industry, the application range of the power cable is increasingly wide, but the internal strengthening mode of the power cable mainly adopts an additionally-arranged armor structure, the power cable is single, and when the power cable is burnt at high temperature, the internal conductors are combined together, so that the power cable is damaged all the time, the mutual interference condition is serious, the flame-retardant mode mainly adopts the material characteristics of the power cable or additionally-arranged passive flame-retardant substances, the flame-retardant characteristics of the power cable are polluted, the flame-retardant effect of the additionally-arranged passive flame-retardant substances is not good, and the negative influence is generated on the flame-retardant effect of the power cable.
In order to achieve the purpose, the invention provides the following technical scheme: a B1-grade flame-retardant crosslinked polyethylene insulated polyolefin sheath power cable comprises a polyethylene outer sleeve, an armor cavity, a protective sleeve, an outer ring, a driving ring, a core ring and an insulating sleeve, wherein the armor cavity is reserved on the circumferential inner wall of the polyethylene outer sleeve, the circumferential inner wall of the armor cavity is sleeved with the protective sleeve, the outer ring is reserved on the circumferential inner wall of the protective sleeve, the circumferential inner wall of the outer ring is sleeved with the driving ring, the circumferential inner wall of the driving ring is sleeved with the core ring, the circumferential inner wall of the core ring is sleeved with the insulating sleeve, the circumferential inner wall of the polyethylene outer sleeve is sleeved with a polyolefin inner sleeve, an armor belt is sleeved inside the armor cavity, a main oxygen-isolating layer and an auxiliary oxygen-isolating layer are reserved inside the protective sleeve, the circumferential inner wall of the outer ring is sleeved with an inner ring, the circumferential inner wall of the core ring is bonded with a frame ring, and an expanded graphite compression plate is filled inside the frame ring, the utility model discloses a mica powder filling device, including frame ring, insulating cover, combined structure, mica powder filling chamber, the circumference inner wall reservation of frame ring has the hole, the circumference inner wall of hole cup joints insulating cover, the circumference inner wall of insulating cover has cup jointed the inside lining, the quantity of inside lining is four, four the integrated structure of inside lining is cylindrical, four mica powder filling chamber has been seted up to the inside of inside lining, the inside grafting in mica powder filling chamber has the naked copper conductor.
Preferably, the armor belt is made of steel wires, and the armor belt is circularly arrayed on the circumferential inner wall of the armor cavity.
Preferably, a glass fiber wrapping tape is sleeved on the inner circumferential wall of the armor tape, and flame retardant powder is filled in the glass fiber wrapping tape.
Preferably, the interior of the mica powder filled cavity is filled with a mica composition.
Preferably, the circumferential outer wall of the driving ring is uniformly provided with release holes, and the circumferential outer wall of the core ring is provided with meshes matched with the release holes.
A preparation method of a B1-level flame-retardant crosslinked polyethylene insulated polyolefin sheath power cable comprises the following steps:
s1: selecting polyethylene: 12-30 parts; lead-free PVC: 10-15 parts; releasing agent: 0.3-0.5 part; silica gel flame retardant powder: 5-12 parts of a solvent; wear-resisting agent: 5-9 parts of a solvent; filling materials: 13-15 parts of the polyethylene coating, adopting a mechanical mixing mode, controlling the rotating speed of a motor of a mixer to be 2000r/min, controlling the mixing time to be 20-45 min, controlling the temperature to be 70-120 ℃ during mixing, cooling for 30-50 min, and extruding by matching with an extruder device to obtain the polyethylene coating;
s2: proportioning polyolefin insulating material, plasticizer, antioxidant, lubricant and colorant, weighing the materials according to the proportion of 65: 10: 15: 8: 2, adopting a mechanical mixing mode, mixing for 15-30 min at the temperature of 60-75 ℃, ensuring invasion of impurities, preventing material dirtying, ensuring no color value difference and no agglomeration of the ingredients, and extruding by matching an extruding device after pressing to obtain the polyolefin inner sleeve;
s3: taking the polyethylene outer sleeve, and sleeving the polyolefin inner sleeve on the circumferential inner wall of the polyethylene outer sleeve;
s4: taking the armor belt, and winding the armor belt on the circumferential outer wall of the armor cavity in a manner of matching with a winding machine, wherein an expansion agent needs to be filled between the armor belt and the polyolefin inner sleeve, and the distance from a twisting head to a twisting point is 13-20 mm;
s5: reserving a main oxygen isolation layer and an auxiliary oxygen isolation layer in the protective sleeve, placing the outer ring into the protective sleeve, taking the driving ring into the outer ring, and placing the flame-retardant powder in a contact gap;
s6: the core rings are bonded in the driving ring, the number of the core rings is four, and the four core rings uniformly divide the circumferential inner wall of the inner hole;
s7: sleeving the insulating sleeve in the driving ring, wherein the insulating sleeve is contacted with the circumferential outer wall of the lining and sequentially wound from inside to outside, the number of winding layers is 3-5, and red phosphorus flame-retardant master batches are gradually added in the winding process to ensure that the mica powder filling cavity in the lining is uniformly filled;
s8: adopting a 2500Mpa isostatic press, integrally pressing the components after the sleeving is finished, wherein the pressing time is 15-35 min, the pressure is 6-10 GPa, then pressing for 20-35 min again, and the pressure is 6-10 GPa, so that the phenomena of disorder lines, line pressing, line loosening and the like are avoided;
s9: after the cable is rolled and formed, the cable is externally packaged, and surface identification is carried out and checked: factory name, overprint content, model, specification, year, cable number and rice standard; the printed characters are clear and firm, and have no error printing and missing printing.
Compared with the prior art, the invention has the beneficial effects that: the power cable with the B1-grade flame-retardant cross-linked polyethylene insulated polyolefin sheath and the preparation method thereof are characterized in that by changing the structure of a conventional cable, a protective sleeve of an oxygen isolation layer is additionally arranged in the cable, an outer ring carrying an inner ring is sleeved in the protective sleeve, a driving ring carrying a core ring is sleeved in the inner ring, the core ring is internally provided with a frame ring structure which supports the inside to ensure the protection of the insulating sleeve, an expanded graphite compression plate is filled in the inner part, when the cable meets the external high-temperature combustion condition, the expanded graphite compression plate is heated to expand and is matched with the mesh release of the core ring to release from a release hole outside the driving ring to actively fill the inside, air is blocked, the flame retardance initiative is good, the loss in the high-temperature and combustion processes is reduced, the filling effect is stable and nondestructive, the using effect of the power cable is ensured to the maximum, and the inner sleeve is divided into four linings, a complete circular structure is combined, and the four linings are filled with flame-retardant structures, so that the four linings are mutually isolated when the four linings meet the combustion condition, and the interference on the power cable is reduced to the maximum extent.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of the driving ring assembly of the present invention;
FIG. 3 is an exploded view of the active ring of the present invention;
FIG. 4 is a schematic top view of a core ring of the present invention.
In the figure: 100 polyethylene outer sleeve, 110 polyolefin inner sleeve, 200 armor cavity, 210 armor tape, 220 glass fiber wrapping tape, 300 protective sleeve, 310 main oxygen-insulating layer, 320 auxiliary oxygen-insulating layer, 400 outer ring, 410 inner ring, 500 driving ring, 510 core ring, 520 frame ring, 530 expanded graphite compression plate, 540 inner hole, 600 insulating sleeve, 610 inner liner, 620 mica powder filling cavity and 630 bare copper conductor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a preparation method of a B1-grade flame-retardant cross-linked polyethylene insulated polyolefin sheath power cable, which can ensure that the power cable has strong supporting capacity and good conductor barrier property and is convenient for achieving the purpose of active flame retardance, and please refer to fig. 1-4, wherein the power cable comprises a polyethylene sheath 100, an armored cavity 200, a protective sleeve 300, an outer ring 400, an active ring 500, a core ring 510 and an insulating sleeve 600;
referring to fig. 1 again, the inner circumferential wall of the outer polyethylene sleeve 100 has an inner polyolefin sleeve 110, and specifically, the inner circumferential wall of the outer polyethylene sleeve 100 is sleeved with the inner polyolefin sleeve 110;
referring to fig. 1 again, the outer circumferential wall of the armor cavity 200 is in contact with the inner circumferential wall of the polyethylene jacket 100, specifically, the armor cavity 200 is reserved on the inner circumferential wall of the polyethylene jacket 100, an armor tape 210 is sleeved inside the armor cavity 200, the armor tape 210 is made of steel wires, the armor tapes 210 are circularly arrayed on the inner circumferential wall of the armor cavity 200, a glass fiber wrapping tape 220 is sleeved on the inner circumferential wall of the armor tape 210, and flame retardant powder is filled inside the glass fiber wrapping tape 220;
referring to fig. 1 again, the outer circumferential wall of the protective sheath 300 is sleeved with the inner circumferential wall of the armor cavity 200, specifically, the inner circumferential wall of the armor cavity 200 is sleeved with the protective sheath 300, and a main oxygen barrier layer 310 and an auxiliary oxygen barrier layer 320 are reserved inside the protective sheath 300.
Referring to fig. 1 again, the outer circumferential wall of the outer ring 400 is sleeved with the inner circumferential wall of the protective sleeve 300, specifically, the outer ring 400 is reserved on the inner circumferential wall of the protective sleeve 300, and the inner circumferential wall of the outer ring 400 is sleeved with the inner ring 410.
Referring to fig. 2-4 again, the circumferential outer wall of the driving ring 500 is sleeved with the circumferential inner wall of the outer ring 400, specifically, the circumferential inner wall of the outer ring 400 is sleeved with the driving ring 500, the circumferential inner wall of the driving ring 500 is sleeved with the core ring 510, the circumferential inner wall of the core ring 510 is bonded with the frame ring 520, the inside of the frame ring 520 is filled with the expanded graphite compression plate 530, the circumferential inner wall of the frame ring 520 is reserved with inner holes 540, the circumferential outer wall of the driving ring 500 is uniformly provided with release holes, and the circumferential outer wall of the core ring 510 is provided with meshes matched with the release holes.
Referring to fig. 1 to 4 again, the outer circumferential wall of the insulating sleeve 600 is sleeved with the inner circumferential wall of the active ring 500, specifically, the inner circumferential wall of the core ring 510 is sleeved with the insulating sleeve 600, the inner circumferential wall of the inner hole 540 is sleeved with the insulating sleeve 600, the inner circumferential wall of the insulating sleeve 600 is sleeved with four inner liners 610, the number of the inner liners 610 is four, the combined structure of the four inner liners 610 is cylindrical, a mica powder filling cavity 620 is formed inside the four inner liners 610, a bare copper conductor 630 is inserted into the mica powder filling cavity 620, and a mica composition is filled into the mica powder filling cavity 620.
The invention also provides a preparation method of the B1-grade flame-retardant crosslinked polyethylene insulated polyolefin sheath power cable, which comprises the following steps:
referring to fig. 1-4, the preparation method of the B1-grade flame-retardant crosslinked polyethylene insulated polyolefin sheathed power cable comprises the following steps:
s1: selecting polyethylene: 12-30 parts; lead-free PVC: 10-15 parts; releasing agent: 0.3-0.5 part; silica gel flame retardant powder: 5-12 parts of a solvent; wear-resisting agent: 5-9 parts of a solvent; filling materials: 13-15 parts of the polyethylene coating, adopting a mechanical mixing mode, controlling the rotating speed of a motor of a mixer to be 2000r/min, controlling the mixing time to be 20-45 min, controlling the temperature to be 70-120 ℃ during mixing, cooling for 30-50 min, and extruding by matching with an extruder device to obtain the polyethylene coating 100;
s2: proportioning polyolefin insulating material, plasticizer, antioxidant, lubricant and colorant, weighing the materials according to the proportion of 65: 10: 15: 8: 2, adopting a mechanical mixing mode, mixing for 15-30 min at 60-75 ℃, ensuring that sundries are invaded, preventing the material from being dirty, ensuring that the mixture has no color value difference and no agglomeration, and extruding by matching an extruding device after pressing to obtain the polyolefin inner sleeve 110;
s3: taking a polyethylene outer sleeve 100, and sleeving a polyolefin inner sleeve 110 on the circumferential inner wall of the polyethylene outer sleeve 100;
s4: taking the armor tape 210, winding the armor tape on the outer circumferential wall of the armor cavity 200 by matching with a winding machine, filling an expanding agent between the armor tape 210 and the polyolefin inner sleeve 110, wherein the distance from the twisting head to the twisting point is 13-20 mm;
s5: reserving a main oxygen barrier layer 310 and an auxiliary oxygen barrier layer 320 in the protective sleeve 300, placing the outer ring 400 into the inner part, taking the driving ring 500 into the outer ring 400, and placing flame retardant powder in a contact gap;
s6: the inside of the driving ring 500 is bonded with four core rings 510, and the four core rings 510 uniformly divide the circumferential inner wall of the inner hole 540;
s7: an insulating sleeve 600 is sleeved in the driving ring 500, the insulating sleeve 600 contacts the circumferential outer wall of the lining 610 and is sequentially wound from inside to outside, the number of winding layers is 3-5, and red phosphorus flame-retardant master batches are gradually added in the winding process, so that the mica powder filling cavity 620 in the lining 610 is uniformly filled;
s8: adopting a 2500Mpa isostatic press, integrally pressing the components after the sleeving is finished, wherein the pressing time is 15-35 min, the pressure is 6-10 GPa, then pressing for 20-35 min again, and the pressure is 6-10 GPa, so that the phenomena of disorder lines, line pressing, line loosening and the like are avoided;
s9: after the cable is rolled and formed, the cable is externally packaged, and surface identification is carried out and checked: factory name, overprint content, model, specification, year, cable number and rice standard; the printed characters are clear and firm, and have no error printing and missing printing.
Examples
S1: selecting polyethylene: 30 parts of (1); lead-free PVC: 15 parts of (1); releasing agent: 0.5 part; silica gel flame retardant powder: 12 parts of (1); wear-resisting agent: 9 parts of (1); filling materials: 15 parts of the polyethylene, adopting a mechanical mixing mode, controlling the rotating speed of a motor of a mixer to be 2000r/min, controlling the mixing time to be 45min, controlling the temperature during mixing to be 70 ℃, cooling for 30min, and extruding by matching with an extruder device to obtain a polyethylene outer sleeve 100;
s2: proportioning polyolefin insulating material, plasticizer, antioxidant, lubricant and colorant, weighing the materials according to the proportion of 65: 10: 15: 8: 2, adopting a mechanical mixing mode, mixing for 30min at the temperature of 75 ℃, ensuring the invasion of impurities, preventing the dirtying of materials, ensuring no color value difference and no agglomeration of the ingredients, and extruding by matching an extruding device after pressing to obtain the polyolefin inner sleeve 110;
s3: taking a polyethylene outer sleeve 100, and sleeving a polyolefin inner sleeve 110 on the circumferential inner wall of the polyethylene outer sleeve 100;
s4: taking the armor tape 210, winding the armor tape on the outer circumferential wall of the armor cavity 200 by matching with a winding machine, filling an expansion agent between the armor tape 210 and the polyolefin inner sleeve 110, wherein the distance from the twisting head to the twisting point is 20 mm;
s5: reserving a main oxygen barrier layer 310 and an auxiliary oxygen barrier layer 320 in the protective sleeve 300, placing the outer ring 400 into the inner part, taking the driving ring 500 into the outer ring 400, and placing flame retardant powder in a contact gap;
s6: the inside of the driving ring 500 is bonded with four core rings 510, and the four core rings 510 uniformly divide the circumferential inner wall of the inner hole 540;
s7: an insulating sleeve 600 is sleeved in the driving ring 500, the insulating sleeve 600 contacts the circumferential outer wall of the lining 610 and is sequentially wound from inside to outside, the number of winding layers is 5, red phosphorus flame-retardant master batches are gradually added in the winding process, and the mica powder filling cavity 620 in the lining 610 is ensured to be uniformly filled;
s8: adopting a 2500Mpa isostatic press, integrally pressing the components after the sleeving is finished, wherein the pressing time is 35min, the pressure is 6GPa, then pressing for 20min again, and the pressure is 10GPa, so that the phenomena of disorder lines, line pressing, line loosening and the like are avoided;
s9: after the cable is rolled and formed, the cable is externally packaged, and surface identification is carried out and checked: factory name, overprint content, model, specification, year, cable number and rice standard; the printed characters are clear and firm, and have no error printing and missing printing.
In summary, by changing the structure of a conventional cable, a protective sleeve of an oxygen isolation layer is additionally arranged in the cable, an outer ring carrying an inner ring is sleeved in the protective sleeve, a driving ring carrying a core ring is sleeved in the inner ring, a frame ring structure is arranged in the core ring, the inner part of the core ring is supported, the protective property of the insulating sleeve is ensured, an expanded graphite compression plate is filled in the inner part, when the external high-temperature combustion condition is met, the expanded graphite compression plate is heated and expanded and is released by matching with meshes of the core ring, the release holes outside the driving ring are released to carry out active internal filling, air is blocked, the flame retardance initiative is good, the loss in the high-temperature and combustion processes is reduced, the filling effect is stable and nondestructive, the using effect of the power cable is ensured to the maximum, the inner sleeve is divided into four inner liners, a complete circular structure is combined, and the flame retardance structure is filled in all the four inner liners, the flame-retardant cable is blocked in case of combustion, so that the interference to the power cable is reduced to the maximum extent.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the embodiments disclosed herein may be used in any combination, provided that there is no structural conflict, and the combinations are not exhaustively described in this specification merely for the sake of brevity and conservation of resources. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. A B1-grade flame-retardant cross-linked polyethylene insulated polyolefin sheath power cable is characterized in that: the protective sleeve comprises a polyethylene outer sleeve (100), an armor cavity (200), a protective sleeve (300), an outer ring (400), a driving ring (500), a core ring (510) and an insulating sleeve (600), wherein the armor cavity (200) is reserved on the inner circumferential wall of the polyethylene outer sleeve (100), the protective sleeve (300) is sleeved on the inner circumferential wall of the armor cavity (200), the outer ring (400) is reserved on the inner circumferential wall of the protective sleeve (300), the driving ring (500) is sleeved on the inner circumferential wall of the outer ring (400), the core ring (510) is sleeved on the inner circumferential wall of the driving ring (500), the insulating sleeve (600) is sleeved on the inner circumferential wall of the core ring (510), a polyolefin inner sleeve (110) is sleeved on the inner circumferential wall of the polyethylene outer sleeve (100), an armor belt (210) is sleeved inside the armor cavity (200), a main oxygen barrier (310) and an auxiliary oxygen barrier (320) are reserved inside the protective sleeve (300), the inner ring (410) is sleeved on the circumferential inner wall of the outer ring (400), a frame ring (520) is bonded on the circumferential inner wall of the core ring (510), the protective sleeve (300) of the oxygen-isolating layer is additionally arranged in the cable, the outer ring (400) carrying the inner ring (410) is sleeved in the protective sleeve (300), the driving ring (500) carrying the core ring (510) is sleeved in the inner ring (410), the frame ring (520) structure is arranged in the core ring (510) and supports the inside, the expanded graphite compression plate (530) is filled in the frame ring (520), an inner hole (540) is reserved on the circumferential inner wall of the frame ring (520), the insulating sleeve (600) is sleeved on the circumferential inner wall of the insulating sleeve (600), the inner liners (610) are sleeved on the circumferential inner wall of the insulating sleeve (600), the number of the inner liners (610) is four, and the combined structure of the four inner liners (610) is cylindrical, mica powder filling cavities (620) are formed in the four inner liners (610), and bare copper conductors (630) are inserted into the mica powder filling cavities (620).
2. The power cable with flame retardant crosslinked polyethylene insulating polyolefin sheath of grade B1 according to claim 1, wherein: the armor strips (210) are made of steel wires, and the armor strips (210) are circularly arrayed on the inner wall of the circumference of the armor cavity (200).
3. The power cable with flame retardant crosslinked polyethylene insulating polyolefin sheath of grade B1 according to claim 1, wherein: the glass fiber wrapping tape (220) is sleeved on the inner wall of the circumference of the armor tape (210), and flame retardant powder is filled in the glass fiber wrapping tape (220).
4. The power cable with flame retardant crosslinked polyethylene insulating polyolefin sheath of grade B1 according to claim 1, wherein: the mica powder filled cavity (620) is filled with a mica composition.
5. The power cable with flame retardant crosslinked polyethylene insulating polyolefin sheath of grade B1 according to claim 1, wherein: the circumference outer wall of the driving ring (500) is uniformly provided with release holes, the circumference outer wall of the core ring (510) is provided with meshes matched with the release holes, when the circumference outer wall meets the external high-temperature combustion condition, the expanded graphite compression plate (530) is heated and expanded and is matched with the release of the meshes of the core ring (510) to release from the release holes outside the driving ring (500) so as to actively fill the inside and block air.
6. A method for preparing the B1-grade flame-retardant crosslinked polyethylene insulated polyolefin sheathed power cable according to any one of claims 1-5, wherein the method comprises the following steps: the preparation method of the B1-grade flame-retardant cross-linked polyethylene insulated polyolefin sheath power cable comprises the following steps:
s1: selecting polyethylene: 12-30 parts; lead-free PVC: 10-15 parts; releasing agent: 0.3-0.5 part; silica gel flame retardant powder: 5-12 parts of a solvent; wear-resisting agent: 5-9 parts of a solvent; filling materials: 13-15 parts of the polyethylene coating (100) is obtained by adopting a mechanical mixing mode, wherein the rotating speed of a motor of a mixer is 2000r/min, the mixing time is 20-45 min, the temperature during mixing is 70-120 ℃, the polyethylene coating is cooled for 30-50 min, and the polyethylene coating is extruded by matching with an extruder device;
s2: proportioning polyolefin insulating material, plasticizer, antioxidant, lubricant and colorant, weighing the materials according to the proportion of 65: 10: 15: 8: 2, adopting a mechanical mixing mode, mixing for 15-30 min at the temperature of 60-75 ℃, ensuring that sundries are invaded, preventing the material from being dirty, ensuring that the mixture has no color value difference and no agglomeration, and extruding by matching an extruding device after pressing to obtain the polyolefin inner sleeve (110);
s3: taking the polyethylene outer sleeve (100), and sleeving the polyolefin inner sleeve (110) on the circumferential inner wall of the polyethylene outer sleeve (100);
s4: taking the armor tape (210), and winding the armor tape on the circumferential outer wall of the armor cavity (200) by matching with a winding machine, wherein an expansion agent needs to be filled between the armor tape (210) and the polyolefin inner sleeve (110), and the distance from a twisting head to a twisting point is 13-20 mm;
s5: reserving a main oxygen-isolating layer (310) and the auxiliary oxygen-isolating layer (320) in the protective sleeve (300), placing the outer ring (400) into the protective sleeve, taking the driving ring (500) into the outer ring (400), and placing the flame-retardant powder in a contact gap;
s6: the core rings (510) are bonded in the driving ring (500), the number of the core rings (510) is four, and the four core rings (510) are used for uniformly dividing the circumferential inner wall of the inner hole (540);
s7: the insulating sleeve (600) is sleeved in the driving ring (500), the insulating sleeve (600) contacts the circumferential outer wall of the lining (610) and is sequentially wound from inside to outside, the number of winding layers is 3-5, and red phosphorus flame-retardant master batches are gradually added in the winding process to ensure that the mica powder filling cavity (620) in the lining (610) is uniformly filled;
s8: adopting a 2500Mpa isostatic press, integrally pressing the components after the sleeving is finished, wherein the pressing time is 15-35 min, the pressure is 6-10 GPa, then pressing for 20-35 min again, and the pressure is 6-10 GPa, so that the phenomena of disorder lines, line pressing, line loosening and the like are avoided;
s9: after the cable is rolled and formed, the cable is externally packaged, and surface identification is carried out and checked: factory name, overprint content, model, specification, year, cable number and rice standard; the printed characters are clear and firm, and have no error printing and missing printing.
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| CN112466535A (en) * | 2020-11-24 | 2021-03-09 | 安徽康泰电气有限公司 | High-oil-resistance and high-temperature-resistance cable for smart energy motor train unit and production process |
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| DE3204667A1 (en) * | 1982-02-11 | 1983-08-18 | Siemens AG, 1000 Berlin und 8000 München | Flame-resistant metal-clad cable |
| CN203480867U (en) * | 2013-10-11 | 2014-03-12 | 广州市珠江电线厂有限公司 | Fireproof cable containing ceramic material and precision conductor material |
| CN108109736A (en) * | 2018-01-08 | 2018-06-01 | 温州包鹿新材料有限公司 | A kind of flame-proof environmental protection formula cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103383A (en) * | 1985-05-13 | 1986-12-10 | Nkf格鲁公司 | Signal-transmitting cable |
| GB9115888D0 (en) * | 1991-07-23 | 1991-09-04 | Bicc Plc | Electric & communications cables |
| US7202418B2 (en) * | 2004-01-07 | 2007-04-10 | Cable Components Group, Llc | Flame retardant and smoke suppressant composite high performance support-separators and conduit tubes |
| CN105572828B (en) * | 2014-06-26 | 2018-08-24 | 江苏华脉光电科技有限公司 | A kind of compact-sized optical cable |
| CN206236459U (en) * | 2016-10-31 | 2017-06-09 | 耒阳星宇电线电缆有限公司 | A kind of anti-wear anti-interference coaxial-cable |
| CN207409288U (en) * | 2017-09-14 | 2018-05-25 | 上海新益特种电缆有限公司 | A kind of flexible mineral matter fireproof cable |
| CN109119195B (en) * | 2018-09-11 | 2020-04-21 | 安徽鸿杰电缆有限公司 | Cable adopting polyvinyl chloride insulating sheath |
| CN210271899U (en) * | 2019-09-11 | 2020-04-07 | 广州市秀全电线电缆有限责任公司 | Electric wire with partition plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3204667A1 (en) * | 1982-02-11 | 1983-08-18 | Siemens AG, 1000 Berlin und 8000 München | Flame-resistant metal-clad cable |
| CN203480867U (en) * | 2013-10-11 | 2014-03-12 | 广州市珠江电线厂有限公司 | Fireproof cable containing ceramic material and precision conductor material |
| CN108109736A (en) * | 2018-01-08 | 2018-06-01 | 温州包鹿新材料有限公司 | A kind of flame-proof environmental protection formula cable |
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| CN111584145A (en) | 2020-08-25 |
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