CN203288281U - Novel middle-voltage fireproof cable - Google Patents
Novel middle-voltage fireproof cable Download PDFInfo
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- CN203288281U CN203288281U CN201320281994XU CN201320281994U CN203288281U CN 203288281 U CN203288281 U CN 203288281U CN 201320281994X U CN201320281994X U CN 201320281994XU CN 201320281994 U CN201320281994 U CN 201320281994U CN 203288281 U CN203288281 U CN 203288281U
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Abstract
The utility model discloses a novel middle-voltage fireproof cable which successively comprises a cable core, a bonding tape, a temperature isolating and reducing layer and a fire resisting layer from inside to outside. The cable core is of a circle structure which is formed by twisting three insulating cores and three filling reinforcement pieces, wherein each insulating core successively comprises a conductor, a conductor shielding layer, an insulating layer, an insulation shielding layer and a metal shielding layer from inside to outside. The material formula of the temperature isolating and reducing layer includes the following by weight: EVA 20-30%, LLDPE plastic 8-15%, Al(OH)3 40-50%, Mg(OH)2 20-30%, and other 2-5%. The novel cable can realize safe and reliable power transmission in a rated middle voltage during fire hazard.
Description
Technical field
The utility model is the improvement for midium voltage cable, relates in particular to a kind of midium voltage cable with low-smoke zero-halogen fire-resistant characteristic.
Background technology
Along with the fast development of the modernization of society, the urban construction construction is also more and more crowded, so super-huge building also starts to get more and more, power load also can be increasing.The fire-resistant low cable that people were familiar with all the time is to more high voltage development, demand is in the fire generating process, can continue the cable of safety and stability transmission 6 ~ 35(kV) electric pressures, that guarantees again simultaneously cable possesses the low smoke and zero halogen characteristic, wherein require the light transmittance of cable fire can reach more than 80%, the I A level level that namely possesses the GA306 standard, this is a no small challenge to the thicker cable of midium voltage cable insulation thickness.Must take into account simultaneously the flexural property of cable and mechanical performance requirement is installed.
Although prior art also has some patent documentations about the low-smoke zero-halogen fire-resistant midium voltage cable, its construction of cable has only been considered cable when fire occurs, and adopts the polyolefine material of multilayer thermal insulation, gear fire the heat of fire generation to be blocked in the structure of outside.The insulating layer of existing these technology considered thermal insulation do not consider the cooling, the gear fire bed considered the gear fire do not consider the heat radiation.Such structure has also hindered cable conductor because electric current distributes outward by the heat that produces in the cable normal course of operation, or finally affects the useful life of the current capacity cable of cable.
And about middle pressure fire-resisting cable public technology mainly take Chinese patent CN200710190369.3 disclosed " middle pressure fire-resisting cable " as main design route.This utility model relates to a kind of middle pressure transmission of electricity fire-resisting cable, it is characterized in that the outer flame retardant coating of middle pressure cable core is, inboard refractory inorganic fiber thermal insulation layer, normally use as the soft type thermo-setting elastomer with the outside, meet to catch fire and change the composite fire thermal insulation layer of gear fire screen thermosphere into, said thermo-setting elastomer,, by low temperature frit, 4-10wt% vulcanizing agent in the silica-based elastomeric material of 30-50wt%, 40-60wt% inorganic fillings, 5-15wt%, mix extrusion modling, sulfuration forms.This composite fire thermal insulation layer, do not running in the flame situation, it is more soft sheath material, can guarantee the excellent bending performance of fireproof construction when normal, change rapidly package shape refractory heat-insulating structure into when meeting fire or high temperature, still can keep certain hour not damaged in the fire fighting environment, effectively stop the damage to primary insulation of flame or high temperature, when outer 850 ℃ of flame temperatures, inboard insulating surface temperature is lower than 180 ℃.Such patent also has ZL200720042350.X, ZL201120193504.1, ZL201120096435.2 etc., its basic ideas are all to set up thermal insulation gear fire bed outside the midium voltage cable metallic shield, this layer material is mostly magnetization silica gel, being the material of elastomeric properties without burning the time, is the effect of magnetized gear fire bed after burning.Such structure has certain fire resistance, but magnetization silicon rubber will play enough fire-resistant effects after magnetization, need enough thickness, yet insulating layer can intercept peripheral flame temperature to the cable internal delivery, equally also intercepted cable because the heat that electric power transfer produces transmits to the periphery, that is to say that this cable adopts the heat sinking function of such structure influence cable, finally causes the decline of the current capacity of cable.This construction of cable does not finish to thermal insulation gear fire bed in addition, and outside also has wrapped fire-barrier material and fire-retardant outer sheath material, and these all will impact to the heat dispersion of cable and cause the further decline of cable current capacity., so such structure is not energy-conservation, need to further optimize.
The newer thinking of middle pressure fire-resisting cable public technology another kind is Chinese patent ZL201220559823.4 disclosed " pressing fire-resisting cable in the self-locking armouring ".This utility model relates in the self-locking armouring presses fire-resisting cable, comprising: cable core and the refractory insulating layer, sheath, armour, oxygen barrier layer and the oversheath that are wrapped in successively the described cable core outside.Cable core comprises a plurality of metallic shield insulated wire cores, and the quantity of described metallic shield insulated wire cores is 3, and described metallic shield insulated wire cores is " product " font arranges, and is provided with filler between described metallic shield insulated wire cores.Armour is copper or copper alloy self-locking armouring.The material of oxygen barrier layer is the halogen-free low-smoke high-flame cable material of polyolefin.On structure, this cable is from becoming the cable core sheath that is of five storeys outward, and its purpose is thermal insulation gear fire action, and abundant like this structure affects the heat dissipation characteristics of cable equally, finally causes the decline of the current capacity of cable.
The utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provides a kind of simple in structure, the fiery better effects if of thermal insulation gear, the operation heat dispersion that affects cable of minimum degree again, the construction of cable of the current capacity of carrying the high pressure fire-resisting cable of maximum capacity.
The technical scheme that realizes the utility model purpose is a kind of Novel medium voltage fire-resisting cable, is followed successively by from the inside to the outside cable core, binding strap, thermal insulation cooling layer and gear fire bed; Described cable core thoroughly does away with edge core and three stranded circular configurations that form of packing by three; Described insulated wire cores is followed successively by conductor, conductor screen, insulation, insulation shielding and metallic shield from the inside to the outside; The formula of the material of described thermal insulation cooling layer is by weight percentage: EVA:20 ~ 30%, LLDPE plastics: 8 ~ 15%, AL (OH)
3: 40 ~ 50%, Mg (OH)
2: 20 ~ 30%, other: 2 ~ 5%.
Described three metallic shields that thoroughly do away with the edge core are in contact with one another.
Described conductor is aluminium alloy or copper cash lay configuration.
Described gear fire bed is the chain sheathed structure of stainless steel band, and cross section is " ∽ " shape, and the circle circle interlocks.
The metal tape thickness of described gear fire bed is 0.2mm.
The internal diameter of described gear fire bed is than the large 1 ~ 3mm of internal diameter of thermal insulation cooling layer.
The oversheath that also comprises the polyolefine material that is extruded in gear fire bed outside.
After having adopted technique scheme, the utlity model has following positive effect: (1) the utility model has increased aluminium alloy conductor with conductor by the outer proposition of original unique copper, adopts aluminium alloy conductor can greatly alleviate the material cost of cable.In order to ensure the fire-resistance property of cable, cable must arrange insulating layer and gear fire bed, and the utility model adopts thermal insulation cooling layer.According to designing requirement, cable needs to keep the complete performance of cable under flame status, and namely cable can continue power supply.This need to guarantee cable under the flame condition of high temperature, the electric and mechanical performance that insulation and conductor keep this structure originally to have, and this needs thermal insulation gear fire bed that the flame high temperature of outside is blocked in outside cable.The public technology basic ideas are select the material (such as magnetization silicon rubber) with very high thermal resistivity and increase this layer material thickness at present, by the thermal resistance mode that improves this layer, play temperature insulating.Such structure can play the effect that stops external flame high temperature, but has also stopped the cable transmission electric energy and the heat that produces, finally causes the cable premature aging or affects the current capacity of cable.The utility model thermal insulation cooling layer, except the effect of thermal insulation, also possesses the ability of lowering the temperature after flame high temperature that runs into.This layer material is adopted and has been increased AL(OH)
3, Mg(OH)
2The proportioning mark, mainly utilize AL(OH)
3, Mg(OH)
2The crystallization water that carries, meeting under the fiery condition of high temperature, can be with the principle of crystallization water gasification cooling, and the proportioning mark that increases this bi-material is exactly in order to give full play to the effect of its cooling.
(2) conductor of the present utility model also proposes to adopt aluminium alloy molded line lay configuration except same, adopt many watts of shape single line concentric strandings to form, such conductor structure, greatly improved the utilance of effective area under the identical appearance size, this is also to adopt aluminium alloy conductor instead of copper conductor in order to meet, and promotes the requirement that causes cross-sectional area of conductor to increase due to resistivity.Adopt watt shape stranded conductor structure, when the conductor effective cross-section can be increased, dwindle as far as possible conductor diameter.Adopt watt shape stranded conductor structure, the cross-sectional area of conductor activity coefficient can reach 94%.The identical traffic capacity, aluminium alloy conductor external diameter and copper conductor external diameter are very nearly the same.Adopt in addition watt shape stranded conductor structure, the conductor profile is rounding, smooth more, more is conducive to improve the field effect of conductor.
(3) gear fire bed Main Function is that the naked light of flame is blocked in the cable outside, does not allow its flame to the cable in-house development.The public technology basic ideas are to select the fire proofing with very high oxygen index as the gear fire bed at present.At present the material of main use is magnetization silicon rubber, utilizes after the burning of magnetization silicon rubber the magnetized performance of being heated, and forms magnetized protective layer cable is peripheral, guarantees that this layer structure do not break under flame status, and flame is blocked in the cable periphery.Such structure has only played the effect of gear fire, there is no the effect of cooling,, so, in order better to realize the fire resistance of fire-proof medium-voltage cable, not only need to possess the fiery characteristic of gear, must possess cooling characteristic.Gear fire bed of the present utility model, employing be the chain sheathed structure of stainless steel band, not only have the gear fiery effect, also possess better flexural property, the radiating and cooling effect that more has.What chain armouring adopted is the copper stainless steel band of 0.2 thickness, has good heat conductivility, adds that structure is bellows-like structure, also has good heat dissipation characteristics.Have good bandability before being subjected to fire, the excellent in heat dissipation effect characteristic, be conducive to set up the current capacity of installing and improving cable; Be subjected to play the fiery effect of gear after fire, guarantee that the cable internal structure is not damaged by naked light.Chain sheathed structure also has certain resistance to compression and tensile characteristics in addition,, for crane cable, has higher Hoisting Security characteristic.
(4) the utility model passes through AL(OH)
3, Mg(OH)
2The crystallization water play the thermal insulation effect with the physical phenomenon of fire distillation cooling, so farthest added AL(OH in this layer material)
3, Mg(OH)
2Yet, after adding, so large amount can reduce largely mechanical performance and the processing characteristics of this layer material, and the utility model has well solved this problem by the innovation on infrastructure device and moulds of industrial equipment.The dark low compression ratio screw rod such as the utility model employing, extrusion die adopts plsitive mold, and mould extrudes angle and be not more than 35 °, the purpose of these requirements is to meet this layer material to add a large amount of AL(OH)
3, Mg(OH)
2After, extrude frictional force large, the requirement of poor processability.The design of extrusion screw rod and mould all must consider to extrude compression ratio can not be large, extrudes after-drawing than little characteristics,, so adopt the low-angle plsitive mold, not only guaranteed low compression ratio but also guaranteed almost nil draw ratio.Simultaneously after extruding that intake chamber is cooling and dry up, this thermal insulation cooling layer enters immediately outer gear fire bed (chain armouring metal level) manufacturing procedure, mechanical strength by means of the chain armour of outside is supplied, the inner insulating layer of homogenizing mechanically stressed, guarantee that insulating layer is not damaged by mechanical external force, and bring into play the effect of its thermal insulation cooling.
Description of drawings
Content of the present utility model is easier to be expressly understood in order to make, and below according to specific embodiment also by reference to the accompanying drawings, the utility model is described in further detail, wherein
Fig. 1 is cross-sectional structure schematic diagram of the present utility model.
Fig. 2 is that sectional view is looked on the left side of Fig. 1, reaction be the gear fire bed chain sheathed structure.
Attached number in the figure is:
Cable core 1, insulated wire cores 11, conductor 11-1, conductor screen 11-2, insulation 11-3, insulation shielding 11-4, metallic shield 11-5, filling reinforcement 12, binding strap 2, thermal insulation cooling layer 3, gear fire bed 4.
Embodiment
(embodiment 1)
See Fig. 1, a kind of Novel medium voltage fire-resisting cable of the present embodiment, be followed successively by cable core 1, binding strap 2, thermal insulation cooling layer 3 and gear fire bed 4 from the inside to the outside.Cable core 1 thoroughly does away with edge core 11 and three stranded circular configurations that form of packing 12 by three.Insulated wire cores 11 is followed successively by conductor 11-1, conductor screen 11-2, insulation 11-3, insulation shielding 11-4 and metallic shield 11-5 from the inside to the outside.According to the AC transmission system requirement, midium voltage cable is generally A, B, the transmission of C three-phase power, so cable core is three core lay configuration, the three metallic shield 11-5 that thoroughly do away with edge core 11 are in contact with one another, and are conducive to like this three-phase equilibrium effect.Conductor 11-1 can adopt copper, also can adopt aluminium alloy, but the utility model proposes preferential employing aluminium alloy conductor, and because its proportion is smaller, resource is relatively abundanter and value ratio is lower, can greatly reduce cable cost.It is base material that the aluminium alloy of conductor 11-1 adopts aluminium, has added 0.1% ~ 0.2% copper, 5% ~ 8% iron, 0.1% silicon and rare earth material (as boron), through the melting hot rolling, forms.Merge the aluminium alloy conductor of making by these elements, its resistivity can reach 63%, and more than intensity can reach 110MPa, elongation at break can reach more than 15%, proportion 2.7kg/dm
3, only have 30% of copper, so adopt aluminium alloy as cable conductor as long as cross section increases once to two specifications, having met the D.C. resistance identical with copper cable.Convert and come like this, under identical traffic capacity prerequisite, cable conductor adopts the aluminium alloy instead of copper, and weight only has 48% of copper, can greatly reduce like this material cost of cable.Conductor 11-1 is aluminium alloy molded line lay configuration simultaneously, adopt many watts of shape single line concentric strandings to form, such conductor structure, greatly improved the utilance of effective area under the identical appearance size, this is also to adopt aluminium alloy conductor instead of copper conductor in order to meet, and promotes the requirement that causes cross-sectional area of conductor to increase due to resistivity.Adopt watt shape stranded conductor structure, when the conductor effective cross-section can be increased, dwindle as far as possible conductor diameter.Adopt watt shape stranded conductor structure, the cross-sectional area of conductor activity coefficient can reach 94%.The identical traffic capacity, aluminium alloy conductor external diameter and copper conductor external diameter are very nearly the same.Adopt in addition watt shape stranded conductor structure, the conductor profile is rounding, smooth more, more is conducive to improve the field effect of conductor.Thoroughly do away with three the gap-fill position that edge core stranding is arranged, three fan-shaped packings 12 are set.
Adopt the conductor of pressing fire-resisting cable in the aluminium alloy conductor conduct, no matter from temperature tolerance or the temperature tolerance of insulating material of conductor, consider, because aluminium alloy thermoplastic temperature is 400 ℃ of left and right; Be crosslinked polyethylene and insulation is adopted, it guarantees under electric property that high-temperature resistant is 250 ℃.All need insulating layer and the gear fire bed of cable that the high temperature that the flame of outside and flame bring is stopped and is isolated in the cable outside, allow cable guarantee that in fire the insulation of cable, the temperature of conductor are controlled in 250 ℃.The formula of the material of thermal insulation cooling layer 3 is by weight percentage: EVA:20 ~ 30%, LLDPE plastics: 8 ~ 15%, AL (OH)
3: 40 ~ 50%, Mg (OH)
2: 20 ~ 30%, other: 2 ~ 5%.The formula of the material of thermal insulation cooling layer 3 of the present utility model has increased AL(OH)
3, Mg(OH)
2The proportioning mark, mainly utilize AL(OH)
3, Mg(OH)
2The crystallization water that carries, meeting under the fiery condition of high temperature, can be with the principle of crystallization water gasification cooling, and the proportioning mark that increases this bi-material is exactly in order to give full play to the effect of its cooling.
If cable need to possess fire resistance characteristic, can also extrude the oversheath of one deck polyolefine material outside armour, be used for waterproof requirement.
Its production technology comprises following step:
(1) the aluminium alloy rod friction is heated to half happy and harmonious state, be squeezed into watt shape conductor monofilament of corresponding size through the mould according to the design of conductor size shape again, then these conductor monofilament are wrapped in the stranded molded line concentric stranding conductor 11-1 that forms on a center circle monofilament according to designing the position at place separately.
(2) extrude simultaneously conductor screen 11-2, insulation 11-3, three layers of insulation system of completing of insulation shielding 11-4 outside conductor 11-1.
(3) wrapped metal screen layer 11-4 outside insulation shielding 11-4.
(4) thoroughly do away with edge core 11 circular cable core 1 of twisted synthesizing cable together with three filling reinforcements 12 with three, and adopt the high-strength polyolefin band to tighten formation binding strap 2.
(5) after binding strap 2 is tightened, extrude by weight percentage as EVA:20 ~ 30%, LLDPE plastics: 8 ~ 15%, AL(OH) 3:40 ~ 50%, Mg (OH) 2:20 ~ 30%, other: the insulating layer 3 that 2 ~ 5% materials that form form; The dark low compression ratio screw rod such as the screw rod employing of extrusion equipment, extrusion die adopts extrudes the plsitive mold that angle is not more than 35 °; Insulating layer 3 extrusions are complete enters upper dish after the tank cooling, directly enter gear fire bed 4 chain armouring operation, upper dish circulation again after the armouring operation is completed.
(6) stainless strip is adopted in the processing of gear fire bed 4, and the control of armouring size should guarantee that the armour internal diameter is slightly larger than the external diameter 1 ~ 3mm of insulating layer.
(7) there is the cable of waterproof requirement to extrude the oversheath of one deck polyolefine material outside armour.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (7)
1. a Novel medium voltage fire-resisting cable, is characterized in that: be followed successively by from the inside to the outside cable core (1), binding strap (2), thermal insulation cooling layer (3) and gear fire bed (4); Described cable core (1) thoroughly does away with edge core (11) and the stranded circular configuration that forms of three packings (12) by three; Described insulated wire cores (11) is followed successively by conductor (11-1), conductor screen (11-2), insulation (11-3), insulation shielding (11-4) and metallic shield (11-5) from the inside to the outside; The formula of the material of described thermal insulation cooling layer (3) is by weight percentage: EVA:20 ~ 30%, LLDPE plastics: 8 ~ 15%, AL (OH)
3: 40 ~ 50%, Mg (OH)
2: 20 ~ 30%, other: 2 ~ 5%.
2. a kind of Novel medium voltage fire-resisting cable according to claim 1 is characterized in that: described three metallic shields (11-5) that thoroughly do away with edge cores (11) are in contact with one another.
3. a kind of Novel medium voltage fire-resisting cable according to claim 1 is characterized in that: described conductor (11-1) is aluminium alloy or copper cash lay configuration.
4. a kind of Novel medium voltage fire-resisting cable according to claim 1, it is characterized in that: described gear fire bed (4) is the chain sheathed structure of stainless steel band, and cross section is " ∽ " shape, the circle circle interlocks.
5. a kind of Novel medium voltage fire-resisting cable according to claim 4, it is characterized in that: the metal tape thickness of described gear fire bed (4) is 0.2mm.
6. a kind of Novel medium voltage fire-resisting cable according to claim 5 is characterized in that: the internal diameter of described gear fire bed (4) is than the large 1 ~ 3mm of internal diameter of thermal insulation cooling layer (3).
One of according to claim 1 to 6 described a kind of Novel medium voltage fire-resisting cable, it is characterized in that: also comprise the oversheath that is extruded in the outside polyolefine material of gear fire bed (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320281994XU CN203288281U (en) | 2013-05-21 | 2013-05-21 | Novel middle-voltage fireproof cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320281994XU CN203288281U (en) | 2013-05-21 | 2013-05-21 | Novel middle-voltage fireproof cable |
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| Publication Number | Publication Date |
|---|---|
| CN203288281U true CN203288281U (en) | 2013-11-13 |
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ID=49544634
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320281994XU Expired - Fee Related CN203288281U (en) | 2013-05-21 | 2013-05-21 | Novel middle-voltage fireproof cable |
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| CN (1) | CN203288281U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104008792A (en) * | 2013-05-21 | 2014-08-27 | 远东电缆有限公司 | Novel medium-voltage fire-resistant cable and production process thereof |
-
2013
- 2013-05-21 CN CN201320281994XU patent/CN203288281U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104008792A (en) * | 2013-05-21 | 2014-08-27 | 远东电缆有限公司 | Novel medium-voltage fire-resistant cable and production process thereof |
| CN104008792B (en) * | 2013-05-21 | 2016-07-06 | 远东电缆有限公司 | A kind of production technology of Novel medium voltage fire-resisting cable |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131113 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |