CN211957223U - Three-core medium-voltage fire-resistant cable - Google Patents
Three-core medium-voltage fire-resistant cable Download PDFInfo
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- CN211957223U CN211957223U CN202021006316.9U CN202021006316U CN211957223U CN 211957223 U CN211957223 U CN 211957223U CN 202021006316 U CN202021006316 U CN 202021006316U CN 211957223 U CN211957223 U CN 211957223U
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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 three-core medium-voltage fire-resistant cable, which comprises conductors, a composite insulating layer, an inner sheath, a buffer layer, a composite insulating layer, a fire-retardant filler, an armor layer and an outer sheath, wherein the three conductors are arranged in a shape like a Chinese character 'pin', the conductors are respectively sleeved with the composite insulating layer, the composite insulating layer is sleeved with the inner sheath, and the buffer layer is arranged between the inner sheath and the composite insulating layer; the outer side of the inner sheath is sleeved with a composite heat insulation layer, a flame-retardant filler is filled in a gap between the composite heat insulation layer and the inner sheath, the composite heat insulation layer is sleeved with an armor layer, and the armor layer is sleeved with an outer sheath. The three-core medium-voltage fire-resistant cable has the advantages of strong fire resistance, prevention of high-temperature damage to the insulating layer, long-term use of the insulating layer and low possibility of damage, overcomes the technical defects of poor fire resistance and easy damage of the insulating layer of the conventional medium-voltage cable, and meets the fire-resistant requirement of medium-voltage power supply.
Description
Technical Field
The utility model relates to a cable, concretely relates to three-core middling pressure fire resisting cable.
Background
The cable is a device for transmitting electric energy, the types of the used cables are different under different power consumption requirements, and along with the high-speed development of economy in China, large buildings in cities are more and more, so that medium-voltage power supply of 3-35kV gradually becomes the main current power supply voltage of large and medium cities, and the requirements of medium-voltage cables corresponding to the medium-voltage power supply are gradually increased. But the data show: more than 60% of various electrical fires in recent years in China are caused by electrical lines (wires and cables), and the fires bring immeasurable loss to the property and personal safety of users, so that high importance is placed on fire safety in all communities, and higher requirements are put forward on the fire safety level of medium-voltage cables.
Although the existing medium-voltage cable has a certain fireproof capacity, the armor of the cable can prevent open fire, but the high temperature generated by flame can still damage the structure inside the cable, specifically, the high temperature easily damages the insulating layer of the conductor, so that the cable has a large short-circuit risk when continuously working, and the potential safety hazard of short-circuit and fire exists; in addition, the conductor generates heat because of the heat effect of electric current after the circular telegram, because the load of conductor in the course of the work is constantly changing, its temperature also constantly changes, and the change of temperature can make the metal sheath in the conductor insulating layer outside produce the condition of expend with heat and contract with cold, because often has the line on the metal sheath, the metal sheath rubs easily when expend with heat and contract with cold and damages the insulating layer, can reduce the reliability of cable after long-term work, consequently needs a new medium voltage cable to solve foretell not enough.
SUMMERY OF THE UTILITY MODEL
In order to overcome the fire resistance that above-mentioned current middling pressure cable exists poor, the technical defect that the insulating layer damaged easily, the utility model provides a fire resistance is strong, prevents that high temperature from destroying insulating layer and insulating layer long-term use not fragile three-core middling pressure fire resisting cable.
In order to solve the above problem, the utility model discloses realize according to following technical scheme:
a three-core middling pressure fire resisting cable, it comprises conductor, composite insulation layer, inner sheath, buffer layer, compound insulating layer, fire-retardant filler, armor and oversheath, its characterized in that: the three-strand conductor is arranged in a shape of Chinese character 'pin', the conductor is respectively sleeved with a composite insulating layer, the composite insulating layer is sleeved with an inner sheath, and a buffer layer is arranged between the inner sheath and the composite insulating layer; the outer side of the inner sheath is sleeved with a composite heat insulation layer, a flame-retardant filler is filled in a gap between the composite heat insulation layer and the inner sheath, the composite heat insulation layer is sleeved with an armor layer, and the armor layer is sleeved with an outer sheath.
The conductor is a stranded conductor.
The composite insulating layer is composed of an inner shielding layer, a middle layer and an outer shielding layer, wherein the middle layer is sleeved on the inner shielding layer, and the outer shielding layer is sleeved on the middle layer.
The inner shielding layer and the outer shielding layer are made of semi-conductive shielding materials.
The middle layer is a crosslinked polyethylene insulating layer.
The inner sheath is a metal pipe.
The inner sheath is a corrugated copper sheath.
The buffer layer is a semi-conductive buffer water-blocking tape.
The composite heat insulation layer is composed of a first heat insulation layer and a second heat insulation layer, and the second heat insulation layer is sleeved on the first heat insulation layer.
The first heat insulation layer is a ceramic silicon rubber belt.
The second heat insulation layer is made of ceramic polyolefin material.
The armor layer is a galvanized steel strip.
The outer sheath is made of low-smoke halogen-free polyolefin material.
The outer sheath is made of flame-retardant PVC material.
Compared with the prior art, the beneficial effects of the utility model are that: the three-core medium-voltage fire-resistant cable has the advantages of strong fire resistance, prevention of damage to the insulating layer due to high temperature and difficult damage of the insulating layer due to long-term use, adopts the semi-conductive buffer water-blocking tape as the buffer layer to separate the metal sheath from the composite insulating layer, and avoids the damage of the insulating layer caused by thermal expansion of the metal sheath; the semi-conductive buffering water-blocking tape also has excellent heat-insulating property, prevents high temperature from damaging the composite insulating layer, and in addition, the buffer layer also has the effect of water blocking, avoids the conductor from being eroded by water, and overcomes the technical defects that the existing medium-voltage cable is poor in fire resistance and the insulating layer is easy to damage due to the heat-insulating effect of the composite heat-insulating layer, and meets the fire-resistant requirement of medium-voltage power supply.
Drawings
The following detailed description of embodiments of the invention is provided with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic structural view of the composite insulating layer of the present invention;
fig. 3 is a schematic structural view of the composite thermal insulation layer of the present invention.
In the figure: 1. the cable comprises a conductor, 2, a composite insulating layer, 201, an inner shielding layer, 202, a middle layer, 203, an outer shielding layer, 3, an inner sheath, 4, a buffer layer, 5, a composite heat insulation layer, 501, a first heat insulation layer, 502, a second heat insulation layer, 6, a flame retardant filler, 7, an armor layer, 8 and an outer sheath.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
As shown in fig. 1-3, a three-core medium voltage fire-resistant cable, it comprises conductor 1, composite insulation layer 2, inner sheath 3, buffer layer 4, composite insulating layer 5, fire-retardant filler 6, armor 7 and oversheath 8, conductor 1 is that oxygen-free copper pole is drawn, the transposition forms, promptly conductor 1 is the transposition conductor that national standard GB/T3956-2008 stipulates. The three-strand conductor 1 is arranged in a shape of Chinese character 'pin', the conductor 1 is respectively sleeved with the composite insulating layer 2, and the composite insulating layer 2 is used for balancing an electric field and preventing the conductor 1 from generating a partial discharge phenomenon; as shown in fig. 2, the composite insulating layer 2 is composed of an inner shielding layer 201, an intermediate layer 202 and an outer shielding layer 203, the inner shielding layer 201 is a semiconductive inner shielding material, the inner shielding layer 201 is sleeved on the conductor 1, so that the composite insulating layer 2 is in good contact with the cable conductor 1, smoothness is reduced due to the twisted influence on the surface of the conductor 1, and the inner shielding layer 201 can eliminate the situation that the electric field intensity on the surface of the conductor 1 is increased due to unsmooth operation.
The cover is equipped with intermediate level 202 on the internal shield layer 201, and intermediate level 202 is the crosslinked polyethylene insulating layer, has good insulating properties, and the cover is equipped with external shield layer 203 on the intermediate level 202, and external shield layer 203 is the semiconduction external shield material, as the utility model relates to an embodiment of preferred, internal shield layer 201, intermediate level 202 and external shield layer 203 are the one shot extrusion moulding of production mode that adopts the three-layer crowded altogether of catenary type crosslinking production line, with 2 crowded packages of composite insulation layer on conductor 1 to accomplish the cross-linking work in the crosslinked pipeline, so that 2 and 1 in close contact with of composite insulation layer make, avoid producing the air gap between 2 and the conductor 1 of composite insulation layer, prevent that conductor 1 from puncturing the cable.
The cover is equipped with inner sheath 3 on the outer shielding layer 203, and inner sheath 3 is the tubular metal resonator, as the utility model relates to an embodiment of preferred, inner sheath 3 is that the copper strips welds into the copper pipe through the mode that argon arc welded, then makes into wrinkle copper sheath through the rolling machine, and inner sheath 3 of wrinkle copper sheath preparation has stronger compressive capacity, can block well that outer material produces the pressure that the inflation brought under the heating condition, and the safety of better protection composite insulation layer 2, in addition, inner sheath 3 of copper material has good thermal conductivity, can be rapidly with heat transfer to whole cable on, prevent that the heat from concentrating the insulating condition of damage and appearing.
A buffer layer 4 is arranged between the inner sheath 3 and the composite insulating layer 2, and specifically, the buffer layer 4 is wrapped on the outer shielding layer 203 in a wrapping mode; as a preferred embodiment of the present invention, the buffer layer 4 is a semi-conductive buffer water-blocking tape, and the buffer layer 4 can block the damage of external heat to the composite insulating layer 2, so as to ensure the integrity of the composite insulating layer 2 and prevent the insulation performance from being affected; in addition, the semiconductive buffering water-blocking tape has good water-blocking effect and electrical performance, the buffer layer 4 between the inner sheath 3 and the composite insulating layer 2 increases the contact area of the inner sheath 3 and the outer shielding layer 203, reduces the contact resistance, and simultaneously reduces the damage to the composite insulating layer 2 when the corrugated copper sheath is corrugated, and in the subsequent use process, the buffer layer 4 prevents the inner sheath 3 from damaging the composite insulating layer 2 when the composite insulating layer 2 is heated to expand, so that the service life of the cable is prolonged.
The outer side cover of inner sheath 3 is equipped with compound insulating layer 5, as shown in fig. 3, compound insulating layer 5 comprises first insulating layer 501 and second insulating layer 502, as the utility model discloses an embodiment of preferred, first insulating layer 501 is the pottery silicone rubber area, is equipped with second insulating layer 502 on the first insulating layer 501 in a cover, and second insulating layer 502 is the pottery polyolefin material, and when compound insulating layer 5 met the high temperature above 350 ℃, pottery silicone rubber area and pottery polyolefin material can crust into hard protective layer, and the inside of protective layer is cellular aperture, and compound insulating layer 5 utilizes cellular aperture to hold the air, because the air is hot bad conductor, therefore compound insulating layer 5 can play good thermal-insulated effect when high temperature; fire-retardant filler 6 is equipped with in the space between compound insulating layer 5 and the inner sheath 3, and fire-retardant filler 6 is refractory material, as the utility model relates to an embodiment of preferred, fire-retardant filler 6 is the fire-resistant filler rope of pottery.
The composite heat-insulating layer 5 is sleeved with an armor layer 7, the armor layer 7 is a galvanized steel strip, the armor layer 7 is wrapped on the composite heat-insulating layer 5 through a steel strip armoring machine, as a preferred embodiment of the utility model, the armor layer 7 adopts double-layer steel strip gap wrapping, the gap rate does not exceed 50% of the width of the galvanized steel strip, the melting point of the steel strip is about 1500 ℃, and the armor layer 7 can block the internal structure of a flame ablation cable and block flame outside the armor layer 7 due to the sealing property of the armor; the cover is equipped with oversheath 8 on the armor 7, and oversheath 8 is fire-retardant PVC material, as the utility model relates to an embodiment of preferred, oversheath 8 is low smoke and zero halogen polyolefin material, can not release halogen-containing toxic gas after the 8 burning of oversheath to avoid leading to the personnel of fleing to be poisoned, the smog of oversheath 8 release in the combustion process is less, can reduce the probability that the personnel of fleing suffocate.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments do not depart from the technical solution of the present invention, and still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a three-core middling pressure fire resisting cable, it comprises conductor (1), composite insulation layer (2), inner sheath (3), buffer layer (4), composite insulation layer (5), fire-retardant filler (6), armor (7) and oversheath (8), its characterized in that: the three-strand conductor (1) is arranged in a shape of Chinese character 'pin', the conductor (1) is respectively sleeved with a composite insulating layer (2), the composite insulating layer (2) is sleeved with an inner sheath (3), and a buffer layer (4) is arranged between the inner sheath (3) and the composite insulating layer (2); the outer side cover of inner sheath (3) is equipped with compound insulating layer (5), is equipped with fire-retardant filler (6) in the space between compound insulating layer (5) and inner sheath (3), and the cover is equipped with armor (7) on compound insulating layer (5), and the cover is equipped with oversheath (8) on armor (7).
2. A three-core medium voltage fire resistant cable according to claim 1, characterized in that: the conductor (1) is a stranded conductor.
3. A three-core medium voltage fire resistant cable according to claim 1, characterized in that: the composite insulating layer (2) is composed of an inner shielding layer (201), an intermediate layer (202) and an outer shielding layer (203), the intermediate layer (202) is sleeved on the inner shielding layer (201), and the outer shielding layer (203) is sleeved on the intermediate layer (202).
4. A three-core medium voltage fire resistant cable according to claim 3, characterized in that: the inner shielding layer (201) and the outer shielding layer (203) are semi-conductive shielding materials.
5. A three-core medium voltage fire resistant cable according to claim 3, characterized in that: the middle layer (202) is a crosslinked polyethylene insulating layer.
6. A three-core medium voltage fire resistant cable according to claim 1, characterized in that: the inner sheath (3) is a corrugated copper sheath.
7. A three-core medium voltage fire resistant cable according to claim 1, characterized in that: the buffer layer (4) is a semi-conductive buffer water-blocking tape.
8. A three-core medium voltage fire resistant cable according to claim 1, characterized in that: the composite heat insulation layer (5) is composed of a first heat insulation layer (501) and a second heat insulation layer (502), the first heat insulation layer (501) is a ceramic silicon rubber belt, the second heat insulation layer (502) is sleeved on the first heat insulation layer (501), and the second heat insulation layer (502) is made of ceramic polyolefin materials.
9. A three-core medium voltage fire resistant cable according to claim 1, characterized in that: the armor layer (7) is a galvanized steel strip.
10. A three-core medium voltage fire resistant cable according to claim 1, characterized in that: the outer sheath (8) is made of low-smoke halogen-free polyolefin material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021006316.9U CN211957223U (en) | 2020-06-04 | 2020-06-04 | Three-core medium-voltage fire-resistant cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021006316.9U CN211957223U (en) | 2020-06-04 | 2020-06-04 | Three-core medium-voltage fire-resistant cable |
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| CN211957223U true CN211957223U (en) | 2020-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021006316.9U Active CN211957223U (en) | 2020-06-04 | 2020-06-04 | Three-core medium-voltage fire-resistant cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113555155A (en) * | 2021-07-23 | 2021-10-26 | 哈尔滨济安轨道交通装备有限公司 | High-voltage cable spiral protective sleeve |
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2020
- 2020-06-04 CN CN202021006316.9U patent/CN211957223U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113555155A (en) * | 2021-07-23 | 2021-10-26 | 哈尔滨济安轨道交通装备有限公司 | High-voltage cable spiral protective sleeve |
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