Ceramic polyolefin environmental protection flame retardant fire-resisting flexible cable
Technical field
The utility model belongs to technical field of electric wires and cables, is specifically related to a kind of ceramic polyolefin environmental protection flame retardant fire-resisting flexible cable.
Background technology
Aforesaid ceramic polyolefin refers to ceramic low smoke halogen-free flame-retardant polyolefin.As is known in the industry, the fire resistance rating of cable significantly can be improved at the outer wrapped mica tape (also claiming fire-retardant twining package tape) of cable core, as Chinese patent Authorization Notice No. CN201247632Y, (communication power supply is with fire-retardant, fire-resistant, shielding anti-interference flexible cable), CN202230791U (the flame-retardant crosslinking polyethylene insulated flexible cable of a kind of communication power supply), CN202601277U (a kind of communication power supply flame-retardant flexible electric cable), CN202720953U (watt form drag combustion shielded flexible cable for communication power supply), CN202855416U (communication power supply fire-resistant shield flexible cable) and CN202736545U (mineral insulated cable), etc..This type of cable is owing to employing mica tape, thus for ensureing that the fire resistance of cable certainly has good advantage, but there is following technical problem: one is that the probability that mica tape ruptures in the process of wrapped mica tape is higher, bottom pour ladle probability is also corresponding higher, requires to be difficult to comprehensive control to the fire resistant quality of cable; Two is that mica layer easily comes off in wrapped process, makes cable occur the underproof situation of the fire resistance rating of discontinuity; Three is due to mica tape fire resistance period relative brevity, and meeting the rear residue of burning is powder form, can not continue to play due resistance to fire action; Four is because mica tape contains glass fiber, and glass fiber is less because of proportion, easily floats in the air of Work places, affects the health (once in suction body, causing physical impairment) of online assignment personnel.
" pressing flame resistant cable in a kind of ceramic " that Chinese patent Authorization Notice No. CN203966634U provides, owing to having abandoned mica tape, thus can eliminate the aforementioned drawback brought by mica tape.
Be not limited to the conductor of above mentioned patent formula owing to not have employed copper conductor exceptionally, thus there is following logical fraud, one, flexibility is poor, bending radius is caused to be restricted, narrow space, to hinder by the object of immovable building and so on so the occasion of to talk in a roundabout way and so on is laid time, very easily affect construction schedule; Its two, due to use copper as conductor, thus in reasonable employment raw material, there is blindness, cause cable cost large; Its three, due to heavy weight, thus not only in the logistics link of transport, storage and so on, cost is high, and in laid processes, the labour intensity of workmen is large; Its four, because the decay resistance of copper conductor is weak, thus the adequate service life of cable is affected.
For above-mentioned prior art, be necessary to be improved, the applicant has done useful design for this reason, and technical scheme described below produces under this background.
Summary of the invention
Task of the present utility model be to provide a kind of contribute to significantly improving flexibility and use conveniently lay and promote the adaptability that narrow space is laid, be conducive to abandoning and use copper conductor and use and significantly reduce cable cost and weight reduction and the expense of saving in logistics link, be of value to and improve decay resistance and use to increase the service life and have and be convenient to promote anti-flammability and avoid the release toxic and harmful when burning and use the ceramic polyolefin environmental protection flame retardant fire-resisting flexible cable embodying excellent Environmental Safety effect.
Task of the present utility model has been come like this, a kind of ceramic polyolefin environmental protection flame retardant fire-resisting flexible cable, comprise cable core and be extruded in the restrictive coating outside cable core, cable core comprises conductor, insulating layer of conductor outside conductor and the packed layer be filled between insulating layer of conductor and restrictive coating, feature is: outside described conductor, be combined with ceramifiable thermoplastic's flame retardant coating that thickness is 100-500 μm, described insulating layer of conductor is positioned at outside ceramifiable thermoplastic's flame retardant coating, and conductor is the stranded cross-sectional area of the naked aluminum-alloy wire of five classes of 0.2-0.45 ㎜ by the diameter of annealed process is 1.5-500 ㎜
2the naked aluminum-alloy wire stranded conductor of five classes, wherein: when described insulating layer of conductor is ceramic low smoke halogen-free flame-retardant polyolefin layer, described restrictive coating is flame-proof polyvinyl chloride layer, and when insulating layer of conductor is flame-proof polyvinyl chloride layer, described restrictive coating is ceramic low smoke halogen-free flame-retardant polyolefin layer.
The outermost direction of lay of five class described in the utility model naked aluminum-alloy wire stranded conductor is stranded left, and direction of lay is between layers contrary.
The twisting pitch of five class described in the utility model naked aluminum-alloy wire stranded conductor is 15-30 times of the diameter of the naked aluminum-alloy wire conductor of five classes.
The thickness of insulating layer of conductor described in the utility model is 0.7-2.8 ㎜; The thickness of described restrictive coating is 0.8-2.4 ㎜.
Packed layer described in the utility model is flame resistant filler layer.
Flame resistant filler layer described in the utility model is fire-retardant PP gasket for packing or flame-proof PVC packing.
One of technique effect of the technical scheme that the utility model provides, be that the stranded naked aluminum-alloy wire stranded conductor of five classes formed of the naked aluminum-alloy wire of five classes of 0.2-0.45mm is as conductor owing to have employed by diameter, thus significantly improve flexibility, be convenient at small space, the place cable laying operation of to talk in a roundabout way and so on; Two, because five classes naked aluminum-alloy wire stranded conductor is significantly cheap relative to copper conductor price, not only can reduce cable cost but also can weight reduction and the expense of saving in logistics link; Three, because the decay resistance of the naked aluminum-alloy wire stranded conductor of five classes is significantly better than copper conductor, thus can extend the useful life of cable; Four, because insulating layer of conductor and restrictive coating can not discharge toxic and harmful when burning, thus can embody excellent Environmental Safety effect; Five, because ceramifiable thermoplastic's flame retardant coating and ceramic low smoke halogen-free flame-retardant polyolefin layer have quick and desirable high temperature crust effect, thus still can ensure the normal operation of cable when fire occurs.
Accompanying drawing explanation
Fig. 1 is cross sectional representation of the present utility model.
Embodiment
Refer to Fig. 1, give cable core 1 and be namely extruded in restrictive coating 2 outside cable core 1 in the mode of squeeze jacket to extrude mode, cable core 1 comprises conductor 11, insulating layer of conductor 12 outside conductor 11 and is filled between insulating layer of conductor 12 and restrictive coating 2 for making the packed layer 13 of cable rounding.
Technical essential as the technical scheme that the utility model provides: be combined with ceramifiable thermoplastic's flame retardant coating 14 that thickness is 100-500 μm outside aforesaid conductor 11, aforesaid insulating layer of conductor 12 is positioned at outside ceramifiable thermoplastic's flame retardant coating 14; Conductor 11 is that the naked aluminum-alloy wire of five classes of 0.2-0.45 ㎜ is stranded by the diameter of annealed process and cross-sectional area is 1.5-500 ㎜
2the naked aluminum-alloy wire stranded conductor of five classes.In addition, when aforesaid insulating layer of conductor 12 is ceramic low smoke halogen-free flame-retardant polyolefin layer, so restrictive coating 2 is flame-proof polyvinyl chloride layer, otherwise, when insulating layer of conductor 12 is flame-proof polyvinyl chloride layer, so restrictive coating 2 is ceramic low smoke halogen-free flame-retardant polyolefin layer.Applicant it should be noted that: if insulating layer of conductor 12 and restrictive coating 2 are all adopted ceramic low smoke halogen-free flame-retardant polyolefin layer, so should be considered as equivalence and substitutes and still belong to technology contents category disclosed in the utility model.But insulating layer of conductor 12 and restrictive coating 2 can not adopt flame-proof polyvinyl chloride layer, otherwise can affect the fire resistance of cable simultaneously.
The outermost direction of lay of above mentioned five class naked aluminum-alloy wire stranded conductor is stranded left, and direction of lay is between layers contrary, twisting pitch is preferably conductor 11 and is the 15-30 of the diameter of the naked aluminum-alloy wire conductor of five classes doubly, be 18-27 times preferably, be 20-25 times better, be preferably 22 times, the utility model all selects 22 times by mention below 18 embodiments.
The thickness of aforesaid insulating layer of conductor 12 is 0.7-2.8 ㎜, and the thickness of aforesaid restrictive coating 2 is 0.8-2.4 ㎜, is specifically stated clearly by the embodiment of 18 below.Aforesaid packed layer 13 is fire-retardant PP packed layer, but also can use flame-proof PVC packing.
The raw material of above mentioned ceramifiable thermoplastic's flame retardant coating 14 is: ethene-alpha-olefin copolymer, the first filler are if mica (muscovite, sericite or phlogopite), the second filler are if boric anhydride (also can be borax, ammonium borate or Firebrake ZB), stearic acid lubricant are as the mixture of zinc stearate or calcium stearate and antioxidant; The raw material of above mentioned ceramic low smoke halogen-free flame-retardant polyolefin layer is: the mixture of ethene-alpha-olefin copolymer, the first Vitrified powder (as borax, ammonium borate or Firebrake ZB), the second Vitrified powder (combinations as one or more in attapulgite, bentonite, imvite, kaolin, mica, talcum powder, calcium silicates, wollastonite, calcium carbonate crystal whisker), lubricant and antioxidant.
A known class in the conductor 11 (i.e. five classes naked aluminum-alloy wire stranded conductor) that the utility model is recommended and wires and cables industry and two class aluminium conductors have substantial and are difficult to the difference come to realize by those of skill in the art, because a known class and two class aluminium conductors are commonly a class duralumin conductor and two class duralumin conductors in wires and cables industry.But, the naked aluminum-alloy wire (monofilament) that the utility model adopts five classes ultra-fine is stranded to be formed, namely aforesaid diameter is adopted to be the naked aluminum-alloy wire stranded conductor of five classes of 0.2-0.45 ㎜, the conductor 11 of this structure is in space state up to now in China's wires and cables industry, and there is no national standard and/or industry standard can be followed, the applicant is applied to cable, has the positive effect being confirmed the technique effect referred in superincumbent technique effect hurdle.
When the cable of the utility model as communication power supply, rated voltage is 450-750V and 600-1000V; Long-term work adaptive temperature is-20 ~ 70 DEG C, and minimum bending radius is four to ten five times of the outside diameter of cable, and wherein: non-armored type is four times that are greater than the outside diameter of cable, armored type is ten times that are greater than the outside diameter of cable.
Above-mentioned conductor 11 preferably but the thickness of the diameter of the radical of the sectional area of be not limited to 18 kinds of specifications, the naked aluminum-alloy wire of five classes, the naked aluminum-alloy wire monofilament of five classes, the thickness of insulating layer of conductor 12, the thickness of restrictive coating 2 and ceramifiable thermoplastic's flame retardant coating 14 by shown in 18 embodiments of following table:
In above-mentioned 18 embodiments, the insulating layer of conductor 12 in embodiment 1 to 9 adopts ceramic low smoke halogen-free flame-retardant polyolefin layer, and restrictive coating 2 adopts flame-proof polyvinyl chloride layer, and packed layer 13 adopts fire-retardant PP gasket for packing; Insulating layer of conductor 12 in embodiment 10 to 18 adopts flame-proof polyvinyl chloride layer, and restrictive coating 2 adopts ceramic low smoke halogen-free flame-retardant polyolefin layer, and packed layer 13 adopts flame-proof PVC packing.
In sum, the technical scheme that the utility model provides overcomes the deficiency in prior art, successfully completes invention task, embodies the technique effect in the superincumbent technique effect hurdle of applicant objectively.