CN103531290A - Annular-stripe flexible fireproof power cable, and manufacturing method and annealing device thereof - Google Patents
Annular-stripe flexible fireproof power cable, and manufacturing method and annealing device thereof Download PDFInfo
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- CN103531290A CN103531290A CN201210232627.0A CN201210232627A CN103531290A CN 103531290 A CN103531290 A CN 103531290A CN 201210232627 A CN201210232627 A CN 201210232627A CN 103531290 A CN103531290 A CN 103531290A
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Abstract
Disclosed are an annular-stripe flexible fireproof power cable, and a manufacturing method and annealing device thereof. The invention relates to a power cable. The annular-stripe flexible fireproof power cable includes a metal external protective sleeve, a conductive wire core which is arranged to be threading the external protective sleeve and an insulating layer which is wrapped on the conductive wire core. Annular grooves, which are mutually spaced, extending in a circumferential direction of the external protective sleeve and axially distributed, are arranged on the external surface of the external protective surface. Annular projections, which are mutually spaced, extending in a circumferential direction of the external protective sleeve and axially distributed, are arranged on the internal surface of the external protective sleeve. Positions of the annular grooves and the annular projections are aligned. An objective of the invention is to provide the annular-stripe flexible fireproof power cable which is great in humidity resistance performance, comparatively low in degradation of insulating performance of the cable when the insulating layer is damaged, less susceptible to structural damages caused by longitudinal stretch of the cable when the cable is bent and large in curvature when bent and the manufacturing method thereof so that a problem, which exists in the prior fireproof power cables, that the insulating performance is deteriorated because humid intrudes in an axial direction of the cable and fragments of the insulating layer are likely to fall out in the axial direction of the cable is solved.
Description
Technical field
The present invention relates to power cable, relate in particular to a kind of ring grain fire resistant flexible power cable and preparation method thereof and the annealing device that this cable is annealed.
Background technology
Power cable adopts organic material if rubber, plastics etc. are as the insulating barrier being wrapped in outside conductor wire core conventionally, and after power cable catches fire, insulating barrier can be totally burned, and can send smog and harmful substance.Some power cables with organic material making insulating barrier after improving, although smog can obviously reduce when ignition, harmful substance discharges and improves, after ignition, electric wire circuit still can work on.
For improving the above-mentioned shortcoming of power cable, design and using the metal oxides such as magnesia powder and make insulating barrier as insulating material, take the fire proof power cable of metal tube outside sheath is set in insulating barrier, the manufacturing process of this kind of power cable is: first on conductive copper wire core, wear magnesium oxide porcelain knob and make insulation core wire (this magnesium oxide porcelain knob forms by hydraulic press and sintering furnace manufacture), then outsourcing copper pipe is rolled into metal section with head rolling machine, and be through outside insulation core wire, be placed on again and on chain type vertical pulling machine, do straight line and stretch, and heat-treat in roller-bottom type continuous oven, finally on disc type stretching-machine, do lopping drawing, above-mentioned straight line stretches, heat treatment and drawing procedure will repeatedly be carried out repeatedly, after performance test, packing warehouse-in.This kind of protection of electrical cable exists manufacture method complicated, technological process is longer, equipment is more, and energy consumption is severe, and cable length is shorter, joint is more, hardness is larger, any length in the time of cannot accomplishing to need, each root conductor wire core of cable, all can only adopt a wires to make, very hard being difficult to lays to make cable; In addition, magnesia ceramics column filling speed is slower, and labour cost is higher, and automaticity is lower; The metal oxides such as magnesia powder are the moisture absorption very easily, during use, because the moisture absorption reduces insulation resistance, so mineral insulated cable must carry out again lengthy and tedious and strict termination, processes, and could use safely.
For overcoming, using the metal oxides such as magnesia powder as the above-mentioned deficiency of the protection of electrical cable of insulating material, designed and usingd mica tape or glass fiber tape or the asbestos silk ribbon fire proof power cable as insulating material.In China Patent Publication No., be 1588563A, within open day, be that the patent documentation that March 2 in 2005, day, were called " flexible fire-proof cable and production technology thereof and production equipment " is disclosing a kind of fireproof cable cable.This fire proof power cable comprises metallic conduction core, is included in the mica tape insulating barrier outside metal core and is wrapped in the metal shell (oversheath) outside insulating barrier.In order to improve the pliability of cable, this cable has bundle line at shell peripheral hardware.
But there is following defect in existing general of the fire proof power cable that is provided with metallic jacket: moisture easily makes moist cable along the axial dispersion of cable in cable, thus the insulation property of reduction cable; When insulating barrier has breakage, thereby insulating barrier fragment can affect the insulation property of cable and anti-extrusion ability along axially dropping out of cable; In order to improve the antiseptic property of cable, can coat organic anti-corrosive coating on metal protection cover surface, when producing fire, corrosion-inhibiting coating can produce burning, and to environment, and there is caducous deficiency in coating.
Summary of the invention
One object of the present invention aims to provide that a kind of humidity resistance is good, the decreasing insulating of insulating barrier cable when damaged is difficult for because longitudinal stretching causes ring grain fire resistant flexible power cable structural deterioration and that curvature is large and preparation method thereof when little, crooked, solve existing fire proof power cable because of moisture along the axial invasion of cable and insulating barrier fragment easily along the problem that axially drops out caused decreasing insulating of cable.
Another object of the present invention is intended to improve ring grain fire resistant flexible power cable and the annealing device thereof with copper protective jacket that a kind of anticorrosive coat is difficult for dropping and can be not burned, has solved existing fireproof cable cable and has been undertaken by coating is set that anticorrosion existing anticorrosive coat easily comes off and the problem of not environmental protection.
Above technical problem solves by following technical proposal: a kind of ring grain fire resistant flexible power cable, comprise metallic jacket, be located in the conductor wire core in oversheath and be wrapped in the insulating barrier on conductor wire core, the outer surface of described oversheath is provided with the ring-shaped groove of the circumferential extension axial distribution along oversheath being spaced apart from each other, the inner surface of described oversheath is provided with the annular protrusion of the circumferential extension axial distribution along oversheath being spaced apart from each other, and the position of described ring-shaped groove and described annular protrusion aligns.Outer surface at protective jacket arranges spaced ring-shaped groove, at the inner surface of protective jacket, corresponding to the position of ring-shaped groove, annular protrusion is set, not only make bending increased frequency, the crooked process radius of cable reduce, and each one of annular protrusion formation stops moisture axially entering cable inside and preventing that insulating barrier fragment is along the isolation strip axially dropping out of cable along cable, moisture is difficult for axially entering cable inside along cable, when the insulating barrier of cable has fragmentation, fragment can maintain original position and can axially not drop out along cable.If only form groove and do not form projection at the inner surface of protective jacket at the outer surface of protective jacket, although the flexibility of cable is made moderate progress, do not possess moistureproof and prevent the effect that fragment drops out.When if groove is the form of the helical structure that is connected together, in the process cable being bent, when inflection point is located a side and is groove, opposite side can be muscle, during axial tension, cable easily produces structural deterioration and bending curvature is less, and from this structure, when groove is spaced version, in the process that cable is bent, the same time slot in both sides, place, inflection point, so the curvature of structure when longitudinal stretching causes structural deterioration and increases cable bend can improve bending time.
As preferably, described oversheath is copper sheathing.Good toughness, convenient while producing ring-shaped groove and annular protrusion.
As preferably, the surface of described oversheath is provided with cupric oxide protective layer.Arrange after cupric oxide overcoat, can effectively prevent that surface of outer sheath variable color, corruption from producing verdigris, take cupric oxide as the beneficial effect of overcoat as: during cable fire, can not produce pernicious gas, and cupric oxide is insulator, can further improves cable with extraneous insulation property.
As preferably, described cupric oxide protective layer is for carrying out the layer that in annealing process, oxidation forms to oversheath.Can be reduced in the processing step while making overcoat on cable, simultaneous oxidation copper overcoat is difficult for departing from.
As preferably, the mixed type inorganic material band that described insulating barrier is made for vertical bag or wrapped mica tape on copper core or glass fiber tape or asbestos silk ribbon or metal oxide.Improve the pliability of cable.
As preferably, the quantity of described conductor wire core is 1-42.
As preferably, described conductor wire core is single-core line core or by 1-53 strands of stranded multicore cores that form of conductive filament.
A kind of process of making ring grain fire resistant flexible power cable:
The first step, according to the specification of cable, select corresponding single-core line core or multicore core as conductor wire core;
Second, the mixed type inorganic material band made with mica tape or glass fiber tape or asbestos silk ribbon or metal oxide carry out the wrapped or vertical bag of positive and negative multilayer of positive and negative multilayer to single conductor wire core, thereby form single core insulation heart yearn; To thering is the cable of many conductor wire cores, single core insulation core of corresponding radical is twisted together and forms multicore insulation core wire;
The 3rd step, insulation core wire longitudinally wrap shoe with metal tape, along the longitudinal seam of metal tape, weld, and form fireproof cable;
The 4th step, on jacket outer surface, prick out the ring-shaped groove being spaced apart from each other along fireproof cable axial distribution outside, the position that the wall portion inwardly protruding of oversheath in pricking out the process of ring-shaped groove and forming is positioned on inner surface is with the annular protrusion of ring-shaped groove alignment; Mode to ring-shaped groove and annular protrusion with rolling synchronously generates, and improves the convenience while making ring-shaped groove and annular protrusion.
The 5th step, oversheath is annealed; If oversheath is copper sheathing, in annealing device, be filled with oxygen, make in the oxidation of copper sheathing outer surface, to form cupric oxide protective layer in the process of annealing.
As preferably, during copper sheathing is annealed in the 5th step, annealing temperature is 600 ℃-1000 ℃, annealing time is 5-15 minute, in annealing process, when passing into oxygen in annealing device, pass into hydrogen, passing into the flow of the oxygen in annealing device and the flow-rate ratio of hydrogen is A, 4≤A≤8.Make hydrogen and oxygen combustion produce steam, simultaneously due to excess oxygen, cable is in hot and humid aerobic environment and anneals, in the process of being convenient to anneal, generate fast cupric oxide protective layer.
A kind of annealing device, the temperature sensor and the temperature control equipment that comprise cable transfer mechanism, boiler tube, the heater heating to boiler tube, detection boiler tube internal temperature, it is characterized in that, also comprise the pressure sensor for detection of boiler tube internal pressure, described boiler tube is provided with the first air inlet, the second air inlet and gas outlet, and described the first air inlet is provided with first flow electrically-controlled valve, described the second air inlet is provided with the second flow electrically-controlled valve; When the temperature of boiler tube reaches after annealing temperature, temperature control equipment control cables conveying mechanism is sent into cable in boiler tube and is annealed, controls first flow valve and the second flow valve and in boiler tube, input gas with the flow-rate ratio of setting, when heater stop temperature after heating transducer detect temperature in boiler tube also higher than set annealing temperature time or pressure sensor while pressure in boiler tube being detected higher than set point, described temperature control equipment is controlled first flow valve and the second flow valve and is reduced to the flow of inputting gas in boiler tube.In the process of annealing, the heat producing while burning due to hydrogen and oxygen can make furnace temperature rise, now first the power output by reducing heater by Control for Kiln Temperature in annealing region, if furnace temperature is still higher after heater stop heating, reduce generation that the flow of the hydrogen enter in boiler tube and oxygen reduces heat to reduce temperature, if pressure, higher than set point, also reduces the flow of oxygen and hydrogen, to guarantee the safety of boiler tube.
The present invention has following advantage, outer surface at oversheath arranges spaced ring-shaped groove, at the inner surface of oversheath, corresponding to the position of ring-shaped groove, annular protrusion is set, not only can effectively improve the flexibility of cable, can prevent that moisture from invading vertically and insulating barrier fragment axially drops out along cable, make cable can keep preferably insulation property simultaneously; In preferred version, select copper product to make oversheath, and in annealing, making oversheath be in aerobic environment carries out, can in the process of annealing, synchronously produce cupric oxide overcoat, antiseptic property, the overcoat that improves cable is difficult for dropping, the generation pernicious gas that can not burn, simplification make the processing step of overcoat and improved the feature of environmental protection of cable; Annealing device of the present invention can form hot and humid aerobic environment around at cable, is conducive to form fast cupric oxide overcoat on copper sheathing surface.
Accompanying drawing explanation
Fig. 1 is the cross sectional representation of ring grain fire resistant flexible power cable of the present invention.
Fig. 2 is the axial cross-sectional schematic of the oversheath of ring grain fire resistant flexible power cable of the present invention.
Fig. 3 is the structural representation of annealing device of the present invention.
Fig. 4 is the use view of annealing device.
In figure: oversheath 1, cupric oxide overcoat 11, weld seam 12, ring-shaped groove 13, annular protrusion 14, conductor wire core 2, insulating barrier 3, boiler tube 4, the first air inlets 41.The second air inlet 42.Gas outlet 43.First flow electrically-controlled valve 44.The second flow electrically-controlled valve 45.Heater 5, temperature sensor 6, pressure sensor 7, temperature control equipment 8, cable transfer mechanism 9, source of oxygen 101, sources of hydrogen 102.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further illustrated.
Referring to Fig. 1, a kind of ring grain fire resistant flexible power cable, comprises oversheath 1, is located in four conductor wire cores 2 and insulating barrier 3 in oversheath 1.
Oversheath 1 is made for copper.The surface of oversheath 1 is provided with cupric oxide overcoat 11.The weld seam 12 that has a longitudinal extension on oversheath 1.
Insulating barrier 3 is made for mica tape.
Referring to Fig. 2, the outer surface of oversheath 1 is provided with the ring-shaped groove 13 of the circumferential extension axial distribution along oversheath 1 being spaced apart from each other.The inner surface of oversheath 1 is provided with the annular protrusion 14 of the circumferential extension axial distribution along oversheath being spaced apart from each other.Ring-shaped groove 13 and annular protrusion 14 align correspondingly.
Referring to Fig. 3, a kind of annealing device, comprises boiler tube 4, heater 5, temperature sensor 6, pressure sensor 7, cable transfer mechanism 9 and temperature control equipment 8.
Boiler tube 4 is provided with the first air inlet 41, the second air inlet 42 and gas outlet 43.The first air inlet 41 is provided with first flow electrically-controlled valve 44.The second air inlet 42 is provided with the second flow electrically-controlled valve 45;
Heater 5 is heating wire.Heating wire is looped around the left end of boiler tube 4.Temperature sensor 6 and pressure sensor 7 are all arranged in the left end of boiler tube 4.
Heater 5, temperature sensor 6, pressure sensor 7, first flow electrically-controlled valve 44 and the second flow electrically-controlled valve 45 5 all synthermal control device 8 are electrically connected.
Referring to Fig. 1 and Fig. 2, the concrete manufacturing process conduct of ring grain fire proof power cable of the present invention:
The first step, select the copper list core conductor wire core of required diameter.Certainly if differentiate wire core 2 is multicore conductor wire core, select copper multicore conductor wire core;
Second, with mica tape, to single conductive copper wire core 2, positive and negative multilayer is wrapped and form the heart yearn with insulating barrier 3 respectively; Four heart yearns with insulating barrier 3 are twisted together to formation cable core; Or the vertical bag of positive and negative multilayer, to thering is the cable of many copper cores.
The 3rd step, with copper strips, longitudinally wrap and carry out outside cable core, along the longitudinal seam of copper strips, weld, seam crossing forms weld seam 12, and copper strips forms oversheath 1.
The 4th step, in the enterprising conduct of oversheath 1 to pressure, thereby on the outer surface of oversheath 1, form ring-shaped groove 13, the position corresponding to ring-shaped groove 11 on the inner surface of oversheath synchronously forms annular protrusion 14.
The 5th step, oversheath 1 is annealed.
Annealing concrete grammar be, referring to Fig. 4,
Make the entrance point of first flow control valve 44 connect source of oxygen 101.Make the entrance point of second control valve 45 connect sources of hydrogen 102.In the interior setting annealing temperature of temperature control equipment 8, be 600 ℃, annealing time is 5 minutes, and the flow-rate ratio of oxygen hydrogen is 4.
Cranking temperature control device 8, temperature control equipment 8 starts 5 pairs of boiler tubes 4 of heater and heats; When the temperature that boiler tube 4 detected when temperature detection sensor 6 reaches 600 ℃, temperature control equipment 8 makes that cable transfer mechanism 9 starts, first flow control valve 44 is opened, second control valve 45 is opened; It is 5 minutes that cable transfer mechanism 9 makes handling cable enter from the left end of boiler tube 4 that right-hand member goes out and make the time that region that the gait of march of cable is 600 ℃ for the left end temperature at boiler tube 4 stops; Oxygen through the first air inlet 41 enter in boiler tube, hydrogen enters in boiler tube through the second air inlet pipe 42, the flow-rate ratio that oxygen and hydrogen enter in boiler tube 4 is 4; Hydrogen makes steam in boiler tube with oxygen reaction, and because the flow of oxygen is large, except with hydrogen reaction, also have residue, make oversheath 1 annealing, on surface, form cupric oxide overcoat at the environment of the moist aerobic of high temperature.
During due to combustion of hydrogen, produce heat time temperature in boiler tube 4 during higher than 600 ℃ of annealing temperatures of setting, the power of temperature control equipment 8 reduction heaters 5, makes annealing temperature maintain set point.If heater 5 stops boiler tube 4 to heat the temperature value that after annealing temperature can't reduce setting, or when press detection sensor 7 detects pressure in boiler tube higher than set point, the influx of 45 reduction oxygen and hydrogen falls in temperature control equipment 8 control first flow control valves 44 and second control valve, makes temperature or pressure drop in boiler tube 4.
In a further embodiment; during by copper oversheath 1 is annealed in the 5th step; annealing temperature is set as respectively to 650 ℃, 700 ℃, 750 ℃, 800 ℃, 900 ℃, 950 ℃, 1000 ℃; annealing time is set as respectively 6,8,9,10,11,12,13,14,15 minutes; when passing into the flow of the oxygen in annealing furnace and the flow-rate ratio of hydrogen and being respectively arbitrary combination of 4.5,5,5.8,7,8; can on the surface of oversheath 1, form a layer thickness and be greater than the cupric oxide protective layer after 0.01 millimeter, effectively oversheath 1 be protected.
Oversheath 1 is for copper is made, certainly with copper alloy or stainless steel etc. are known can for making that the metal material of protective cable makes.During stainless steel and other metal materials, while annealing, adopt the process that existing annealing way is identical if, do not need oxygen, but be filled with the inert gases such as nitrogen and prevent that oversheath 1 surface from producing oxide layer.
The mixed type inorganic material that insulating barrier 3 adopts glass fiber tapes or asbestos silk ribbon or metal oxide to make bring substitute mica tape can.
Claims (10)
1. a ring grain fire resistant flexible power cable, comprise metallic jacket, be located in the conductor wire core in oversheath and be wrapped in the insulating barrier on conductor wire core, it is characterized in that, the outer surface of described oversheath is provided with the ring-shaped groove of the circumferential extension axial distribution along oversheath being spaced apart from each other, the inner surface of described oversheath is provided with the annular protrusion of the circumferential extension axial distribution along oversheath being spaced apart from each other, and the position of described ring-shaped groove and described annular protrusion aligns.
2. ring grain fire resistant flexible power cable according to claim 1, is characterized in that, described oversheath is copper sheathing.
3. ring grain fire resistant flexible power cable according to claim 2, is characterized in that, the surface of described oversheath is provided with cupric oxide protective layer.
4. ring grain fire resistant flexible power cable according to claim 3, is characterized in that, described cupric oxide protective layer is for carrying out the layer that in annealing process, oxidation forms to oversheath.
5. according to the ring grain fire resistant flexible power cable described in claim 1 or 2 or 3 or 4, it is characterized in that the mixed type inorganic material band that described insulating barrier is made for vertical bag or wrapped mica tape on copper core or glass fiber tape or asbestos silk ribbon or metal oxide.
6. according to the ring grain fire resistant flexible power cable described in claim 1 or 2 or 3 or 4, it is characterized in that, the quantity of described conductor wire core is 1-42.
7. according to the ring grain fire resistant flexible power cable described in claim 1 or 2 or 3 or 4, it is characterized in that, described conductor wire core is single-core line core or by 1-53 strands of stranded multicore cores that form of conductive filament.
8. a process for the ring grain fire resistant flexible power cable of making described in claim 1 to 7, is characterized in that:
The first step, according to the specification of cable, select corresponding single-core line core or multicore core as conductor wire core;
Second, the mixed type inorganic material band made with mica tape or glass fiber tape or asbestos silk ribbon or metal oxide carry out the wrapped or vertical bag of positive and negative multilayer of positive and negative multilayer to single conductor wire core, thereby form single core insulation heart yearn; To thering is the cable of many conductor wire cores, single core insulation core of corresponding radical is twisted together and forms multicore insulation core wire;
The 3rd step, insulation core wire longitudinally wrap shoe with metal tape, along the longitudinal seam of metal tape, weld, and form fireproof cable;
The 4th step, on jacket outer surface, prick out the ring-shaped groove being spaced apart from each other along fireproof cable axial distribution outside, the position that the wall portion inwardly protruding of oversheath in pricking out the process of ring-shaped groove and forming is positioned on inner surface is with the annular protrusion of ring-shaped groove alignment;
The 5th step, oversheath is annealed; If oversheath is copper sheathing, in annealing device, be filled with oxygen, make in the oxidation of copper sheathing outer surface, to form cupric oxide protective layer in the process of annealing.
9. the process of making ring grain fire resistant flexible power cable according to claim 8, it is characterized in that, during copper sheathing is annealed in the 5th step, annealing temperature is 600 ℃-1000 ℃, annealing time is 5-15 minute, in annealing process, when passing into oxygen in annealing device, pass into hydrogen, passing into the flow of the oxygen in annealing device and the flow-rate ratio of hydrogen is A, 4≤A≤8.
10. one kind to the anneal annealing device of use of the ring grain fire resistant flexible power cable described in claim 1 to 7, the temperature sensor and the temperature control equipment that comprise cable transfer mechanism, boiler tube, the heater heating to boiler tube, detection boiler tube internal temperature, it is characterized in that, also comprise the pressure sensor for detection of boiler tube internal pressure, described boiler tube is provided with the first air inlet, the second air inlet and gas outlet, and described the first air inlet is provided with first flow electrically-controlled valve, described the second air inlet is provided with the second flow electrically-controlled valve; When the temperature of boiler tube reaches after annealing temperature, first flow valve controlled by temperature control equipment and the second flow valve is inputted gas with the flow-rate ratio of setting in boiler tube, when heater stop temperature after heating transducer detect temperature in boiler tube also higher than set annealing temperature time or pressure sensor while pressure in boiler tube being detected higher than set point, described temperature control equipment is controlled first flow valve and the second flow valve and is reduced to the flow of inputting gas in boiler tube.
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| CN201210232627.0A CN103531290A (en) | 2012-07-06 | 2012-07-06 | Annular-stripe flexible fireproof power cable, and manufacturing method and annealing device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107785128A (en) * | 2017-11-01 | 2018-03-09 | 湖州华上电工有限公司 | A kind of enameling machine guide wheel ring sleeve device easily manipulated |
| WO2018090639A1 (en) * | 2016-11-15 | 2018-05-24 | 中天科技海缆有限公司 | Photoelectric composite cable and cable unit thereof |
| CN112351530A (en) * | 2020-11-03 | 2021-02-09 | 安邦电气股份有限公司 | Explosion-proof flame-retardant electric tracing band |
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2012
- 2012-07-06 CN CN201210232627.0A patent/CN103531290A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018090639A1 (en) * | 2016-11-15 | 2018-05-24 | 中天科技海缆有限公司 | Photoelectric composite cable and cable unit thereof |
| CN108074661A (en) * | 2016-11-15 | 2018-05-25 | 中天科技海缆有限公司 | Photoelectric compound cable and its cable unit |
| CN107785128A (en) * | 2017-11-01 | 2018-03-09 | 湖州华上电工有限公司 | A kind of enameling machine guide wheel ring sleeve device easily manipulated |
| CN107785128B (en) * | 2017-11-01 | 2024-01-02 | 湖州华上电工有限公司 | Easy-to-operate guide wheel ring sleeve device of enamelling machine |
| CN112351530A (en) * | 2020-11-03 | 2021-02-09 | 安邦电气股份有限公司 | Explosion-proof flame-retardant electric tracing band |
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Application publication date: 20140122 |