CN218826342U - Flame-retardant fire-resistant environment-friendly medium-voltage power cable - Google Patents
Flame-retardant fire-resistant environment-friendly medium-voltage power cable Download PDFInfo
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- CN218826342U CN218826342U CN202223390477.4U CN202223390477U CN218826342U CN 218826342 U CN218826342 U CN 218826342U CN 202223390477 U CN202223390477 U CN 202223390477U CN 218826342 U CN218826342 U CN 218826342U
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- 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
Abstract
The utility model discloses a flame-retardant fire-resistant environment-friendly medium-voltage power cable, which comprises a cable core, a flame-retardant heat dissipation layer, a cooling layer, a comprehensive fireproof layer and an outer protective layer; the cable core comprises three metal shielding insulation wire cores and a filling frame, the three metal shielding insulation wire cores are twisted with each other, and the filling frame is filled in an area among the three metal shielding insulation wire cores; each metal shielding insulated wire core comprises a conductor, and a conductor shielding layer, a plastic insulating layer, an insulating shielding layer and a metal shielding layer are sequentially coated on the periphery of the conductor from inside to outside; the cable core periphery from inside to outside in proper order the cladding have fire-retardant heat dissipation layer, cooling layer, synthesize flame retardant coating and skin. The utility model discloses the cable external diameter is less, has better refractiveness, fire resistance and environmental protection performance.
Description
Technical Field
The utility model relates to a power cable, concretely relates to fire-retardant fire-resistant environmental protection middling pressure power cable.
Background
The medium-voltage power cable is widely used, is used for transmitting external power lines of electric energy required by engineering projects, occupies an important position in a power system, and can influence the normal operation of the whole engineering project and cause great economic loss once a fire accident happens to the power lines. Consequently, the fire resistance requirements for reliable operation of medium voltage cables are constantly increasing.
However, the following disadvantages mainly exist in the current medium voltage fire resistant power cable:
1) The existing medium-voltage fire-resistant power cable cabling filling generally adopts mineral substances, the mineral substances are high-flame-retardant mineral substance ropes, as is well known, the fire-resistant principle of the medium-voltage fire-resistant cable is to ensure that the temperature of external combustion temperature transferred to an insulating layer is not enough to cause the insulating layer to deform and lose efficacy and still can keep the insulating property of the medium-voltage fire-resistant cable during the combustion period, the mineral substance ropes cannot be in full contact with a metal shielding insulating wire core although having better flame-resistant property and heat-insulating property, so that the effect of transferring the heat of the external combustion to the metal shielding wire core through the mineral substance ropes is poor, namely, the internal heat dissipation of the cable is slow, the local temperature rise in the cable is overhigh, the insulating layer is damaged, the gap on the edge of the metal shielding wire core of the medium-voltage cable is larger, the filling amount of the mineral substance ropes is larger, and in addition, the mineral substance ropes are easy to absorb moisture and are easy to cause corrosion to the metal shielding.
2) The cable core of the existing medium-voltage fire-resistant power cable adopts fire-resistant mud as a cable fire-resistant cooling structure, the fire-resistant mud structure is shaped and hardened after a period of time, the bending performance of the cable is poor, once the cable is in fire, the external temperature of the cable is transmitted through the mineral fire-resistant mud and can release moisture, the cable has a good cooling effect, the fire-resistant mud is sintered into a hard shell along with the progress of combustion, the hard shell structure has good fire-blocking, fire-insulating and oxygen-insulating effects, the external heat can be effectively slowed down and transmitted to the cable core, but the fire-resistant mud structure is a circular ring structure positioned outside the cable core, when the cable is bent in use, the fire-resistant mud structure is easy to crack due to large tension on the outer side of the bend, if the cable is in the bend section in fire, the fire-resistant cable is burnt through cracks, the temperature is prematurely transmitted to the inside of the cable core, the local insulation temperature rise is too high, and the premature insulation performance is lost, and finally the fire-resistant characteristic is failed.
3) The existing medium-voltage fire-resistant electric power fireproof mud structure is large in eccentricity, thick, unstable in fire-resistant property, large in outer diameter of a cable, important and heavy in cable, large in product laying difficulty and large in installation space occupation if in an amorphous structure during production.
SUMMERY OF THE UTILITY MODEL
To the problem that current fire-resistant power cable of middling pressure exists in the aspect of fire-retardant fire-resistant, the utility model aims to provide a fire-retardant fire-resistant environmental protection middling pressure power cable, this middling pressure power cable have better refractiveness and fire resistance, can effectively overcome the problem that prior art exists.
In order to achieve the purpose, the flame-retardant fire-resistant environment-friendly medium-voltage power cable comprises a cable core, a flame-retardant heat dissipation layer, a cooling layer, a comprehensive fireproof layer and an outer protective layer;
the cable core comprises three metal shielding insulating wire cores and a filling frame, the three metal shielding insulating wire cores are twisted with each other, and the filling frame is filled in an area among the three metal shielding insulating wire cores;
each metal shielding insulated wire core comprises a conductor, and a conductor shielding layer, a plastic insulating layer, an insulating shielding layer and a metal shielding layer are sequentially coated on the periphery of the conductor from inside to outside;
and the periphery of the cable core is sequentially coated with a flame-retardant heat dissipation layer, a cooling layer, a comprehensive fireproof layer and an outer tegument from inside to outside.
In a preferred embodiment of the present invention, the filling frame is a halogen-free low-smoke elastomer triangular filling strip, and the edges of the filling strip are in tangential contact with the metal shielding insulated wire core respectively.
In a preferred embodiment of the present invention, the conductor is a compacted round stranded copper conductor of type 2.
In a preferred embodiment of the present invention, the plastic insulating layer is formed by extruding plastic insulating material, and the plastic insulating material may be crosslinked polyethylene or polypropylene.
In a preferred embodiment of the present invention, the flame-retardant heat dissipation layer is formed by wrapping a halogen-free low-smoke flame-retardant polyolefin oxygen-insulating material on the cable core.
In a preferred embodiment of the present invention, the cooling layer is formed by extruding fire-proof mud onto the flame-retardant heat dissipation layer.
In a preferred embodiment of the present invention, the comprehensive fire-proof layer comprises an inner fire-proof layer, a fire-proof oxygen-proof layer, an outer fire-proof layer and an outer heat-proof layer.
In a preferred embodiment of the present invention, the inner and outer heat-insulating protective tapes are formed by overlapping heat-insulating protective tapes wrapped around a bag, the inner and outer fire-insulating fireproof layers are formed by overlapping ceramic fireproof tapes wrapped around a bag, and the fire-proof and oxygen-insulating layer is formed by extruding ceramic halogen-free low-smoke polyolefin oxygen-insulating materials.
In a preferred embodiment of the present invention, the heat insulation protective tape is a glass fiber tape or a mica tape.
In a preferred embodiment of the present invention, the ceramic fire-proof belt is made of reinforced glass cloth adhered with ceramic powder.
In a preferred embodiment of the present invention, the outer sheath may be an extruded halogen-free low-smoke flame-retardant polyolefin sheath, or a composite structure of the metal armor layer and the extruded halogen-free low-smoke polyolefin flame-retardant sheath.
The utility model has the advantages that:
the utility model provides a fire-retardant fire-resistant environmental protection middling voltage power cable has better refractiveness, fire resistance and feature of environmental protection, can effectively overcome the problem that prior art exists.
The utility model provides a fire-retardant fire-resistant environmental protection middling pressure power cable, its whole external diameter is little, light in weight.
Drawings
The invention is further described with reference to the following drawings and detailed description.
Fig. 1 is a cross-sectional illustration of a flame-retardant, fire-resistant, environmentally-friendly medium voltage power cable according to an embodiment of the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.
Referring to fig. 1, the flame-retardant fire-resistant environment-friendly medium voltage power cable provided by the present invention is shown as an example.
As can be seen from the figure, the flame-retardant fire-resistant environment-friendly medium voltage power cable provided by the embodiment mainly comprises a cable core 300, a flame-retardant heat dissipation layer 400, a cooling layer 500, a comprehensive fire-retardant layer 600 and an outer protective layer 700 which are matched with each other.
The cable core 300 in this embodiment mainly includes three metal-shielded insulated wire cores 100 and a filling frame 200.
The three metal shielding insulated wire cores 100 are distributed in a triangular shape and are twisted with each other; meanwhile, the filling jig 200 is filled in the gaps between the three metal-shielded insulated wire cores 100, thereby forming the corresponding cable core 300.
In some embodiments of this example, the metal-shielded and insulated wire core 100 specifically includes a conductor 110, and a conductor shielding layer 120, a plastic insulating layer 130, an insulation shielding layer 140 and a metal shielding layer 150 are sequentially coated on the periphery of the conductor 110 from inside to outside.
The conductor 110 is specifically a 2 nd compacted round stranded copper conductor.
Meanwhile, the conductor shielding layer 120, the plastic insulating layer 130 and the insulation shielding layer 140 can be co-extruded on the conductor 110 through three layers, so that the insulation structure is stable, and the insulation property of the conductor 110 can be ensured.
Here, the metal shielding layer 150 is wrapped on the insulation shielding layer 140 by overlapping copper tapes, which is used for uniform electric field, shielding external electromagnetic interference, and carrying short-circuit current.
In some embodiments of this example, the filling frame 200 is preferably a halogen-free low-smoke elastomer triangular filling strip to reduce the interaction of the metal-shielded insulated wire core 100.
Specifically, the triangular filler strip is matched with the metal shielding insulated wire cores 100, and each side of the triangular filler strip is in tangential contact with the surface of each metal shielding insulated wire core 100. The filling frame 200 arranged in this way can fix the metal shielding layer 150, and the cable core is not loose and has stable structure under the condition that no protective tape is tightly tied outside the cable core.
With respect to the cable core 300 configured as above, in this example, the periphery of the cable core 300 is further sequentially coated with the flame-retardant heat dissipation layer 400, the cooling layer 500, the comprehensive fireproof layer 600 and the outer coating layer 700 from inside to outside, so as to form the flame-retardant fire-resistant environment-friendly medium-voltage power cable.
In some embodiments of the present example, the flame-retardant heat dissipation layer 400 is formed by vacuum-extruding and tube-extruding a halogen-free low-smoke flame-retardant polyolefin oxygen-insulating material on the cable core 300.
Specifically, the halogen-free low-smoke flame-retardant polyolefin oxygen-barrier layer is tightly coated on the outer surface of each cable core 300, and is fully contacted with the periphery of the metal-shielded insulated wire core 100 without adhesion.
As a further preferable scheme, the fire-retardant heat dissipation layer 400 is further formed with a plurality of saw-tooth protrusions uniformly distributed on the outer surface, wherein the height of the saw-tooth is about 80% of the effective thickness of the fire-retardant heat dissipation layer 400, the width of the saw-tooth is equal to the width of the groove, and the width of the saw-tooth is 1.5 to 3 times of the height of the saw-tooth. Therefore, the flame-retardant heat dissipation layer 400 has good heat conduction performance, can absorb heat during cable combustion and transfer the heat to the metal shielding insulation core 100, the flame-retardant heat dissipation layer 400 is protruded based on a plurality of sawteeth formed on the outer surface of the flame-retardant heat dissipation layer, can avoid local heat accumulation inside the cable and overhigh temperature rise, meanwhile, the flame-retardant heat dissipation layer 400 has a high oxygen index and high flame retardance, can better protect the plastic insulation layer 130 of the metal shielding insulation core 100, in addition, the flame-retardant heat dissipation layer 400 is of a compact plastic sleeve structure, has the effect of preventing external moisture and humidity from radially entering the cable core 300, and can prevent the temperature reduction layer 500 from corroding the metal shielding insulation core 100.
In some embodiments of the present example, the cooling layer 500 is formed by extruding fire-proof mud onto the flame-retardant heat-dissipating layer 400.
The cooling layer 500 and the flame-retardant heat dissipation layer 400 are in cross fit, so that the cooling layer 500 is stable in structure and uniform in thickness. Meanwhile, the cooling layer 500 formed by extruding the fireproof mud is also used as a round filling part for forming the cable core 100, the thickness of the cooling layer outside the flame-retardant heat dissipation layer 400 is very thin, when the cable is bent, the metal shielding insulating wire core 100 and the flame-retardant heat dissipation layer 400 of the cable are stressed, and the stress of the cooling layer 500 is small, so that the structure of the cooling layer 500 cannot enable the whole cable to be hardened and the bending performance of the cable to be influenced.
For example, the fire-proof mud in this example is specifically formed by mixing liquid sodium silicate and inorganic mineral powder, the inorganic mineral powder may be one or two of magnesium hydroxide or aluminum hydroxide, the structure is hard and has a certain external force resistance, the cooling layer 500 covers the entire outer surface of the flame-retardant heat-dissipation layer 400, the flame-retardant heat-dissipation layer 400 can be effectively protected from being damaged when the cooling layer 500 is subjected to an external force, moisture can be separated out when the cable is burned, and a significant effect on cooling the cable core is achieved; because the main component of the structure is inorganic mineral, the structure becomes a hard shell after combustion, the plastic insulating layer 130 can be effectively protected from deformation under the action of external force, and the flame-retardant, oxygen-insulating, heat-insulating and fire-blocking plastic insulating layer has better flame-retardant, oxygen-insulating and heat-blocking effects.
In some embodiments of this example, the composite fire barrier layer 600 comprises, in order from the inside to the outside, an inner insulating and protecting layer 610, an inner insulating and protecting layer 620, a fire and oxygen barrier layer 630, an outer insulating and protecting layer 640, and an outer insulating and protecting layer 650.
Specifically, the inner thermal protection layer 610 here is formed by overlapping and wrapping thermal protection tapes, and the thermal protection tapes may be one or a combination of glass fiber tapes and mica tapes. Can slow down the transmission of outside heat to cooling layer 500 during the burning, can alleviate the effect of cooling layer 500 thermal expansion to interior fire prevention flame retardant coating 620 power, can effectively protect interior fire prevention flame retardant coating 620 not destroyed.
The inner fire-insulating fireproof layer 620 and the outer fire-insulating fireproof layer 640 specifically comprise ceramic fireproof belts which are lapped and wrapped in an overlapping mode, when the cable burns, a compact ceramic hard shell structure can be formed, and the cable has good fire-blocking and heat-insulating effects.
The ceramic fireproof belt is composed of reinforced glass cloth fixedly adhered with ceramic powder. By way of example, the ceramic powder can be fixed to the reinforced glass cloth by means of a corresponding silicone adhesive.
The fireproof oxygen-insulating layer 630 is formed by extruding ceramic halogen-free low-smoke polyolefin flame-retardant oxygen-insulating materials, and the ceramic halogen-free low-smoke polyolefin flame-retardant oxygen-insulating materials can generate a honeycomb structure during combustion, so that the honeycomb structure is stable, and has good fire-blocking and heat-insulating effects.
The outer heat insulation protective layer 650 is formed by heat insulation protective tapes which are lapped and wrapped in an overlapping mode, the heat insulation protective tapes can be one or a combination of two of glass fiber tapes or mica tapes, external heat can be slowed down to be transmitted to the outer fire insulation fireproof layer 640 during combustion, the action of the fire and oxygen insulation layer 630 on the outer fire insulation fireproof layer 640 can be relieved, and the outer fire insulation fireproof layer 640 can be effectively protected from being damaged.
In some embodiments of this example, the outer sheath 700, which is the outermost protective layer of the cable, may be a halogen-free low-smoke flame-retardant polyolefin sheath, or a composite structure of a metal armor layer and an extruded halogen-free low-smoke flame-retardant polyolefin sheath, and the metal armor layer may be a metal tape armor or a metal wire armor.
In the flame-retardant fire-resistant environment-friendly medium-voltage power cable provided by the embodiment, as the inner fire-insulating and fireproof layer 620, the fire-resistant and oxygen-insulating layer 630 and the outer fire-insulating and fireproof layer 640 are made of ceramic powder, the three layers are tightly and firmly combined after being combusted, a ceramic comprehensive hard-shell fireproof wall structure can be formed, the fire-insulating, heat-insulating, oxygen-insulating and fireproof effects can be better achieved, and the honeycomb structure of the fire-resistant and oxygen-insulating layer 630 can be better ensured to be formed and not to be damaged during combustion; the outer fire-proof layer 640 can also prevent dust generated after the combustible substances in the fire-proof oxygen-proof layer 630 are burnt out from falling, so that the external heat can be reduced and transferred to the inside of the cable, and the cable can still keep better fire-proof property under the condition that the cable is not provided with an armor layer.
In addition, in the flame-retardant fire-resistant environment-friendly medium-voltage power cable provided by the embodiment, the non-metallic materials used by the conductor shielding layer 120, the plastic insulating layer 130, the insulating shielding layer 140, the filling frame 200, the flame-retardant heat dissipation layer 400, the cooling layer 500, the inner fire insulation protective layer 610, the inner fire insulation protective layer 620, the fire-proof oxygen insulation layer 630, the outer fire insulation protective layer 640, the outer heat insulation protective layer 650 and the outer protective layer 700 are all halogen-free low-smoke materials, so that the cable also has better environment-friendly performance.
In addition, in the flame-retardant fire-resistant environment-friendly medium-voltage power cable provided by the example, the metal shielding layer 150, the flame-retardant heat dissipation layer 400, the temperature reduction layer 500, the inner heat insulation protection layer 610, the inner fire insulation and protection layer 620, the fire-proof oxygen insulation layer 630, the outer fire insulation and protection layer 640, the outer heat insulation and protection layer 650 and the outer protection layer 700 are all made of flame-retardant materials, so that the flame-retardant cable has better flame-retardant performance.
Moreover, in the flame-retardant fire-resistant environment-friendly medium-voltage power cable provided by the embodiment, the periphery of the metal shielding insulated wire core 100 of the cable core 300 is not filled with the filler, but is structurally combined by the flame-retardant heat dissipation layer 400 and the temperature reduction layer 500, so that the effects of temperature reduction and heat dissipation are fully exerted, and the outer diameter and the weight of the cable are effectively reduced.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The flame-retardant fire-resistant environment-friendly medium-voltage power cable is characterized by comprising a cable core, a flame-retardant heat dissipation layer, a cooling layer, a comprehensive fireproof layer and an outer protective layer;
the cable core comprises three metal shielding insulating wire cores and a filling frame, the three metal shielding insulating wire cores are twisted with each other, and the filling frame is filled in an area among the three metal shielding insulating wire cores;
each metal shielding insulated wire core comprises a conductor, and a conductor shielding layer, a plastic insulating layer, an insulating shielding layer and a metal shielding layer are sequentially coated on the periphery of the conductor from inside to outside;
the cable core is sequentially coated with a flame-retardant heat dissipation layer, a cooling layer, a comprehensive fireproof layer and an outer protection layer from inside to outside.
2. The flame-retardant, fire-resistant and environment-friendly medium-voltage power cable according to claim 1, wherein the filling frame is a halogen-free low-smoke elastomer triangular filling strip, and edges of the filling strip are in tangential contact with the metal shielding insulating wire core respectively.
3. The flame-retardant fire-resistant environment-friendly medium-voltage power cable according to claim 1, wherein the flame-retardant heat dissipation layer is formed by wrapping a cable core with a halogen-free low-smoke flame-retardant polyolefin oxygen-insulating material in an extruding manner.
4. The flame-retardant, fire-resistant and environment-friendly medium-voltage power cable as claimed in claim 1, wherein the cooling layer is formed by extruding fire-proof mud onto the flame-retardant heat dissipation layer.
5. The flame-retardant fire-resistant environment-friendly medium-voltage power cable according to claim 1, wherein the comprehensive fire-proof layer comprises an inner fire-proof layer, a fire-proof oxygen-proof layer, an outer fire-proof layer and an outer heat-proof layer.
6. The flame-retardant fire-resistant environment-friendly medium-voltage power cable according to claim 5, wherein the inner and outer heat-insulating protective layers are composed of heat-insulating protective tapes lapped with each other, the inner and outer fire-insulating fireproof layers are composed of ceramic fireproof tapes lapped with each other, and the fire-proof oxygen-insulating layer is composed of ceramic halogen-free low-smoke flame-retardant polyolefin oxygen-insulating material extruded packages.
7. The flame-retardant, fire-resistant and environment-friendly medium-voltage power cable according to claim 6, wherein the heat insulation protective tape is one or a combination of glass fiber tape and mica tape, and the ceramic fireproof tape is made of reinforced glass cloth adhered with ceramic powder.
8. The flame-retardant fire-resistant environment-friendly medium-voltage power cable according to claim 1, wherein the outer sheath can be an extruded halogen-free low-smoke flame-retardant polyolefin sheath, or a composite structure of a metal armor layer and an extruded halogen-free low-smoke flame-retardant polyolefin sheath.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223390477.4U CN218826342U (en) | 2022-12-14 | 2022-12-14 | Flame-retardant fire-resistant environment-friendly medium-voltage power cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223390477.4U CN218826342U (en) | 2022-12-14 | 2022-12-14 | Flame-retardant fire-resistant environment-friendly medium-voltage power cable |
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| CN218826342U true CN218826342U (en) | 2023-04-07 |
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| CN202223390477.4U Active CN218826342U (en) | 2022-12-14 | 2022-12-14 | Flame-retardant fire-resistant environment-friendly medium-voltage power cable |
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