CN113488270A - High-current-carrying medium-voltage fire-resistant cable - Google Patents
High-current-carrying medium-voltage fire-resistant cable Download PDFInfo
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- CN113488270A CN113488270A CN202110740483.9A CN202110740483A CN113488270A CN 113488270 A CN113488270 A CN 113488270A CN 202110740483 A CN202110740483 A CN 202110740483A CN 113488270 A CN113488270 A CN 113488270A
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- Prior art keywords
- fire
- layer
- oxygen
- resistant
- carrying medium
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- 230000009970 fire resistant effect Effects 0.000 title claims abstract description 52
- 230000017525 heat dissipation Effects 0.000 claims abstract description 31
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- 239000001301 oxygen Substances 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims description 69
- 239000000919 ceramic Substances 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 229920000098 polyolefin Polymers 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 239000003063 flame retardant Substances 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims 1
- 230000004888 barrier function Effects 0.000 abstract description 10
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
-
- 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
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
-
- 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
Landscapes
- Insulated Conductors (AREA)
Abstract
本发明公开了一种高载流中压耐火电缆，包括缆芯，缆芯的外部包裹有隔氧散热层，隔氧散热层包括隔氧层和耐火包带，耐火包带包裹于隔氧层的外部，隔氧层的外周设有多个均布的凸脊。本发明解决了中压耐火电缆散热性能差、载流能力低的问题。
The invention discloses a high-current-carrying medium-voltage fire-resistant cable, comprising a cable core, an oxygen-insulating and heat-dissipating layer wrapped on the outside of the cable core, the oxygen-insulating and heat-dissipating layer comprising an oxygen-insulating layer and a fire-resistant wrapping tape, and the fire-resistant wrapping tape is wrapped in the oxygen-insulating layer The outer periphery of the oxygen barrier layer is provided with a plurality of evenly distributed ridges. The invention solves the problems of poor heat dissipation performance and low current-carrying capacity of the medium-voltage fire-resistant cable.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a high-current-carrying medium-voltage fire-resistant cable.
Background
At present, the common fire-resistant cables at home and abroad are mainly low-voltage fire-resistant cables, but along with the expansion of the scale of infrastructure, especially the appearance of more and more high-rise and super high-rise buildings, the low-voltage fire-resistant cables cannot meet the requirement of cable voltage drop in a fire-fighting loop. Therefore, various medium voltage fire-resistant cables are proposed by many companies, but in order to improve fire resistance, a multi-layer fire-resistant material is often adopted in the conventional medium voltage fire-resistant cable, and although the fire resistance is improved, the fire-resistant material has heat insulation performance, so that the heat dissipation performance of the cable is poor during normal operation, the current carrying capacity of the cable is reduced, and the safe operation of a line is influenced. Therefore, when a cable with higher current carrying capacity is needed, the cable with higher current carrying capacity can only be met by selecting a larger cable section, and the line cost is undoubtedly increased.
Those skilled in the art have therefore endeavored to develop a high current-carrying medium voltage fire resistant cable.
Disclosure of Invention
In view of the above defects in the prior art, the invention discloses a high-current-carrying medium-voltage fire-resistant cable, and aims to solve the technical problems that the medium-voltage fire-resistant cable is poor in heat dissipation performance and low in current-carrying capacity.
In order to achieve the purpose, the invention provides a high-current-carrying medium-voltage fire-resistant cable which comprises a cable core, wherein an oxygen-isolating heat dissipation layer is wrapped outside the cable core, the oxygen-isolating heat dissipation layer comprises an oxygen-isolating layer and a fire-resistant wrapping tape, the fire-resistant wrapping tape is wrapped outside the oxygen-isolating layer, and a plurality of uniformly distributed convex ridges are arranged on the periphery of the oxygen-isolating layer.
Preferably, the oxygen isolation layer is made of a high oxygen index oxygen isolation material, the thickness D of the oxygen isolation layer is 3.5-6 mm, the height H of the convex ridge is 1-3 mm, the width W of the convex ridge is 3-5 mm, and the interval L between every two adjacent convex ridges is 4-8 mm.
Through the size design to separating oxygen layer and convex ridge to under the condition of guaranteeing cable bulk strength, reach better radiating effect.
Preferably, the fireproof wrapping tape is a heat insulation fiber tape, and the thickness of the fireproof wrapping tape is 0.3-0.5 mm.
Preferably, the oxygen-insulating heat dissipation layer is wrapped with a fire-blocking heat insulation layer, a fire-resistant heat dissipation layer, a fixing wrapping belt and an outer protection layer in sequence.
Preferably, the fire-blocking heat-insulating layer is made of a ceramic composite material, and the thickness of the fire-blocking heat-insulating layer is 4-6 mm.
Preferably, the fireproof heat dissipation layer is composed of a plurality of fireproof ropes wound outside the fireproof heat insulation layer in a clearance mode, the twisting pitch-diameter ratio of the fireproof ropes is 10-12, and the twisting angle of the fireproof ropes is 14-17 degrees.
Preferably, the diameter of the fire-resistant rope is 4-8 mm, and the gap between every two adjacent fire-resistant ropes is 4-6 mm.
Through adopting fire-resistant rope to dredge around the structure, formed another layer heat dissipation channel, improved the heat-sinking capability to can effectively reduce the temperature of cable core, improve the cable current-carrying capacity. Two heat dissipation channel are located the inside and outside of keeping off fire insulating layer simultaneously, and under the cable combustion condition, because the in-process that the insulating layer of keeping off fire was forming ceramic form barrier layer can produce the displacement of expanding to two heat dissipation channel provide the space of displacement for the insulating layer porcelain-forming process of keeping off fire, more effectual assurance ceramic barrier layer's integrality, thereby improved fire behavior.
Preferably, the fixed wrapping tape is a ceramic composite wrapping tape, and the thickness of the fixed wrapping tape is 0.2-0.4 mm.
Preferably, the outer sheath comprises a metal tape armor and a halogen-free flame retardant polyolefin outer sheath.
Preferably, the cable core comprises three insulating wire cores, the outside of each insulating wire core is wrapped with a metal shield, and the three insulating wire cores are sequentially wrapped with cabling filling and cabling wrapping bands.
The invention improves the heat dissipation capability and the fire resistance of the cable, ensures the current-carrying capacity requirement of the cable in normal operation and the fire resistance requirement under the fire disaster condition, and effectively ensures the operation safety of the circuit and the requirement of continuous power supply of the circuit for a certain time under the fire disaster.
The invention has the beneficial effects that:
by adopting the oxygen-isolating layer structure with the convex ridges, compared with the conventional oxygen-isolating layer structure, the heat dissipation channel is formed between the oxygen-isolating layer and the fire-resistant wrapping tape through the convex ridges. When the cable normally operates, heat generated by heating of the conductor is dissipated out through the heat dissipation channel, so that the heat dissipation capacity of the cable core is improved, the temperature of the cable core is effectively reduced, and the current-carrying capacity of the cable is improved. Meanwhile, when a cable with higher current carrying capacity and fire resistance is needed, the section diameter of the cable is reduced and the manufacturing cost of the line is reduced through the thickness design of each structure.
Drawings
FIG. 1 is a schematic overall structure of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an oxygen barrier heat dissipation layer according to the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
figure 4 is a schematic structural view of a cable core according to the invention.
In the above drawings: 1. a cable core; 11. an insulated wire core; 12. metal shielding; 13. cabling and filling; 14. cabling belt; 2. an oxygen-insulating heat-dissipating layer; 21. an oxygen barrier layer; 22. fire-resistant wrapping tape; 23. a raised ridge; 3. a fire-blocking heat-insulating layer; 4. a refractory heat dissipation layer; 5. fixing the wrapping tape; 6. an outer jacket.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in figure 1, the invention discloses a high-current-carrying medium-voltage fire-resistant cable which comprises a cable core 1, wherein an oxygen-isolating heat dissipation layer 2 is wrapped outside the cable core 1. As shown in fig. 2, the oxygen-insulating and heat-dissipating layer 2 includes an oxygen-insulating layer 21 and fire-resistant wrapping bands 22, and the fire-resistant wrapping bands 22 wrap the exterior of the oxygen-insulating layer 21. The oxygen isolation layer 21 is made of a high oxygen index oxygen isolation material, the refractory wrapping tape 22 is a ceramic fiber tape, the thickness of the refractory wrapping tape is 0.4mm, and the wrapping and covering rate is 15% -25%. As shown in fig. 3, a plurality of uniformly distributed convex ridges 23 are arranged on the periphery of the oxygen-insulating layer 21, the oxygen-insulating layer 21 is an extruded high-oxygen-index oxygen-insulating material, and the thickness D of the oxygen-insulating layer 21 is 4 mm; the height H of the ridges 23 is 1.5mm, the width W of the ridges 23 is 4mm, and the gap L between adjacent ridges 23 is 5.3 mm. The width W and the gap L of the ridge 23 may also be determined according to the diameter of the cable.
In the present embodiment, by adopting the structure of the oxygen barrier layer 21 with the ridges 23, compared with the structure of the conventional oxygen barrier layer 21, the heat dissipation channels are formed between the oxygen barrier layer 21 and the fire-resistant wrapping tape 22 by the ridges 23. By designing the sizes of the oxygen isolating layer 21 and the convex ridge 23, the overall strength of the cable is ensured, and a better heat dissipation effect is achieved. When the cable normally operates, heat generated by heating of the conductor is dissipated through the heat dissipation channel, so that the heat dissipation capacity of the cable core 1 is improved, the temperature of the cable core 1 is effectively reduced, and the current-carrying capacity of the cable is improved.
As shown in fig. 1, the oxygen-insulating heat-dissipating layer 2 is sequentially wrapped with a fire-blocking heat-insulating layer 3, a fire-resistant heat-dissipating layer 4, a fixing tape 5 and an outer protective layer 6. The fire-blocking heat-insulating layer 3 is made of extruded ceramic silicon rubber or ceramic polyolefin and has a thickness of 4 mm. The fire-resistant heat dissipation layer 4 is composed of 25 fire-resistant ropes wound outside the fire-blocking heat-insulating layer 3, the stranding pitch-diameter ratio of the fire-resistant ropes is 10-12, and the stranding angle of the fire-resistant ropes is 14-17 degrees. The diameter of the fire-resistant rope is 6mm, and the gap between two adjacent fire-resistant ropes is 4.3 mm; the fixed wrapping tape 5 is a wrapped ceramic silicon rubber composite tape, the thickness of the fixed wrapping tape is 0.2mm, and the wrapping and covering rate is 15%. The outer sheath 6 comprises a metal tape armor and a halogen-free flame retardant polyolefin outer sheath.
In this embodiment, another layer of heat dissipation channel is formed by adopting the fire-resistant rope sparse winding structure, so that the heat dissipation capability is improved, the temperature of the cable core 1 can be effectively reduced, and the current-carrying capacity of the cable is improved. Two heat dissipation channel are located the inside and outside of keeping off fire insulating layer 3 simultaneously, and under the cable combustion condition, because keep off fire insulating layer 3 at the in-process that forms ceramic form barrier layer, can produce the displacement of expanding to two heat dissipation channel provide the space of displacement for 3 porcelain processes of keeping off fire insulating layer, more effectual assurance ceramic barrier layer's integrality, thereby improved fire behavior. Meanwhile, when a cable with higher current carrying capacity and fire resistance is needed, the diameter of the cross section of the cable is reduced, and the manufacturing cost of the circuit is reduced.
As shown in fig. 4, the cable core 1 includes three insulated wire cores 11, the metal shield 12 is wrapped outside each insulated wire core 11, and the cabling filling 13 and the cabling wrapping tape 14 are sequentially wrapped outside the three insulated wire cores 11.
In the embodiment, the heat dissipation capacity and the fire resistance of the cable are improved, the current-carrying capacity requirement of the cable in normal operation and the fire resistance requirement under the fire disaster condition are ensured, and the operation safety of the circuit and the requirement of continuous power supply of the circuit for a certain time under the fire disaster are effectively ensured.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The utility model provides a high current-carrying medium voltage fire resisting cable, includes cable core (1), its characterized in that: the cable comprises a cable core (1), and is characterized in that an oxygen-isolating heat dissipation layer (2) wraps the outer portion of the cable core (1), the oxygen-isolating heat dissipation layer (2) comprises an oxygen-isolating layer (21) and a fire-resistant belting (22), the fire-resistant belting (22) wraps the outer portion of the oxygen-isolating layer (21), and a plurality of uniformly distributed convex ridges (23) are arranged on the periphery of the oxygen-isolating layer (21).
2. A high current carrying medium voltage fire resistant cable according to claim 1 wherein:
the oxygen isolation layer (21) is made of a high oxygen index oxygen isolation material, the thickness (D) of the oxygen isolation layer (21) is 3.5-6 mm, the height (H) of the convex ridge (23) is 1-3 mm, the width (W) of the convex ridge (23) is 3-5 mm, and the interval (L) between every two adjacent convex ridges (23) is 4-8 mm.
3. A high current carrying medium voltage fire resistant cable according to claim 1 wherein:
the fireproof wrapping tape (22) is a heat insulation fiber tape, and the thickness of the fireproof wrapping tape (22) is 0.3-0.5 mm.
4. A high current carrying medium voltage fire resistant cable according to claim 1 wherein:
the oxygen-insulating heat-dissipating layer (2) is sequentially wrapped with a fire-blocking heat-dissipating layer (3), a fire-resistant heat-dissipating layer (4), a fixed wrapping belt (5) and an outer protective layer (6).
5. A high current carrying medium voltage fire resistant cable according to claim 4 wherein:
the fire-blocking heat-insulation layer (3) is made of ceramic composite materials, and the thickness of the fire-blocking heat-insulation layer (3) is 4-6 mm.
6. A high current carrying medium voltage fire resistant cable according to claim 4 wherein:
the fireproof heat dissipation layer (4) is composed of a plurality of fireproof ropes wound outside the fire-blocking heat insulation layer (3) in a clearance mode, the twisting pitch-diameter ratio of the fireproof ropes is 10-12, and the twisting angle of the fireproof ropes is 14-17 degrees.
7. A high current carrying medium voltage fire resistant cable according to claim 6 wherein:
the diameter of the fire-resistant rope is 4-8 mm, and the gap between two adjacent fire-resistant ropes is 4-6 mm.
8. A high current carrying medium voltage fire resistant cable according to claim 4 wherein:
the fixed belting (5) is a ceramic composite belting, and the thickness of the fixed belting (5) is 0.2-0.4 mm.
9. A high current carrying medium voltage fire resistant cable according to claim 4 wherein:
the outer protective layer (6) comprises a metal tape armor and a halogen-free flame-retardant polyolefin outer sheath.
10. A high current carrying medium voltage fire resistant cable according to claim 1 wherein:
the cable core (1) comprises three insulating wire cores (11), the metal shield (12) is wrapped outside each insulating wire core (11), and the cabling filling (13) and the cabling wrapping belt (14) are sequentially wrapped outside the three insulating wire cores (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110740483.9A CN113488270A (en) | 2021-06-30 | 2021-06-30 | High-current-carrying medium-voltage fire-resistant cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110740483.9A CN113488270A (en) | 2021-06-30 | 2021-06-30 | High-current-carrying medium-voltage fire-resistant cable |
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| Publication Number | Publication Date |
|---|---|
| CN113488270A true CN113488270A (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110740483.9A Pending CN113488270A (en) | 2021-06-30 | 2021-06-30 | High-current-carrying medium-voltage fire-resistant cable |
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| CN (1) | CN113488270A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106098226A (en) * | 2016-08-18 | 2016-11-09 | 重庆市南方阻燃电线电缆有限公司 | A kind of isolated form fireproof cable |
| CN109036682A (en) * | 2018-07-31 | 2018-12-18 | 特变电工山东鲁能泰山电缆有限公司 | A kind of insulating refractory low-smoke non-halogen flame-retardant midium voltage cable with air duct |
| CN109448921A (en) * | 2018-11-19 | 2019-03-08 | 尚纬股份有限公司 | A kind of manufacturing method of inorganic fire medium and high voltage cable |
| CN109509582A (en) * | 2018-12-20 | 2019-03-22 | 河南乐山电缆有限公司 | A kind of low pressure fireproof power cable |
-
2021
- 2021-06-30 CN CN202110740483.9A patent/CN113488270A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106098226A (en) * | 2016-08-18 | 2016-11-09 | 重庆市南方阻燃电线电缆有限公司 | A kind of isolated form fireproof cable |
| CN109036682A (en) * | 2018-07-31 | 2018-12-18 | 特变电工山东鲁能泰山电缆有限公司 | A kind of insulating refractory low-smoke non-halogen flame-retardant midium voltage cable with air duct |
| CN109448921A (en) * | 2018-11-19 | 2019-03-08 | 尚纬股份有限公司 | A kind of manufacturing method of inorganic fire medium and high voltage cable |
| CN109509582A (en) * | 2018-12-20 | 2019-03-22 | 河南乐山电缆有限公司 | A kind of low pressure fireproof power cable |
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Application publication date: 20211008 |