CN214956208U - Mineral insulation fireproof control cable with multi-core small-section conductor - Google Patents
Mineral insulation fireproof control cable with multi-core small-section conductor Download PDFInfo
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- CN214956208U CN214956208U CN202120810042.7U CN202120810042U CN214956208U CN 214956208 U CN214956208 U CN 214956208U CN 202120810042 U CN202120810042 U CN 202120810042U CN 214956208 U CN214956208 U CN 214956208U
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Abstract
The utility model provides a conductor cross-section is little, and the cable external diameter is little, and is rational in infrastructure, convenient to use, the security performance is high, has stronger fire behavior's cable simultaneously, is the mineral insulated cable, and it is by mineral material magnesium oxide powder as insulating copper core copper sheathing cable, and mineral insulated cable comprises copper conductor, magnesium oxide, three kinds of inorganic materials of copper sheathing, and control cable's line footpath can be less than 7.3mm, minimum 3.0 mm. The product is a high-performance fireproof cable which needs to be subjected to drawing and rolling for multiple times for combined processing, has excellent performances of fire resistance, large current-carrying capacity, water resistance, explosion prevention, corrosion resistance, mechanical damage resistance, long service life, no halogen, no toxicity and overload resistance at present, can be used as a grounding wire for a copper sheath, and is generally applicable to occasions such as important places of fire-fighting chestnut power supply and distribution, emergency generator sets, airport parking lots and the like, power distribution, high-temperature furnaces and kilns, metal smelting, ships, oil platforms, ancient buildings, libraries, chemical plants and the like.
Description
Technical Field
The utility model belongs to the technical field of wire and cable, in particular to light-duty mineral substance insulation fireproof cable of multicore small cross-section conductor.
Background
With the improvement of safety consciousness, the mineral insulated cable has wider application in the fields of high-rise buildings, electric power, chemical industry, fire fighting and the like. At present, the production technology of mineral substance insulated power cables is mature, industrial chains are formed at home and abroad to realize industrial production, and multi-core small-section mineral substance insulated control cables have small conductor sections, more wire cores, small outer diameter, high control precision and high production difficulty, particularly mineral substance insulated control cables with the wire diameter smaller than 7.3mm, so that domestic electric wire and cable manufacturing enterprises do not have the production capacity at present, only stay in the stage of research, development and trial production, and industrial mass continuous production is not formed.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the invention aims to provide a cable which has a small conductor section, a small cable outer diameter, a reasonable structure, convenient use, high safety performance and strong fireproof performance, namely a mineral insulated cable, and the cable is a copper core copper sheath cable taking mineral material magnesium oxide powder as insulation, the mineral insulated cable consists of three inorganic materials of a copper conductor, magnesium oxide and a copper sheath, the product is a high-performance fireproof cable which needs to be drawn for multiple times or rolled for multiple times and is processed, the cable at present has the excellent performances of fire resistance, large current-carrying capacity, water resistance, explosion resistance, corrosion resistance, mechanical damage resistance, long service life, no halogen and no toxicity, overload resistance, and the copper sheath can be used as a grounding wire, and the cable is generally applicable to occasions such as important places of power distribution, emergency generating sets, airport parking lots and the like, power wiring, high-temperature furnace kilns and the like of fire-fighting chestnuts, Metal smelting, ships, oil platforms, ancient buildings, libraries, chemical plants, and the like.
The utility model adopts the following technical scheme: a multi-core small-section conductor mineral insulation fireproof control cable comprises a copper conductor, an insulation and a metal sheath, wherein the copper conductor is arranged in the metal sheath, and an inorganic magnesium oxide insulating material is filled between the metal sheath and the copper conductor; the metal sheath is a copper pipe, and the copper sheath adopts a TP2 type phosphorus deoxidized copper belt; the conductor, the insulation and the sheath are compact.
Preferably, the conductor is made of T1M20 type pure copper with 99.99% copper content, and is a single solid annealed copper conductor required by the wire and cable conductor standard.
Preferably, the compacted density of the magnesium oxide powder reaches 3.2g/cm3。
Preferably, the wire diameter of the control cable is less than 7.3mm and greater than 3.0 mm.
Preferably, the preparation method of the control cable comprises the following steps:
(1) tube made of copper strip
(2) Insulation filling
(3) Continuous welding
A special argon arc welding machine is adopted to firmly weld the joint of the copper pipe to form a seamless complete copper pipe; controlling the current of the argon arc welding machine to be 80-300A;
(4) continuous beating
(5) Vertical 8 passes
Continuously rolling the powder-filled copper pipe by using 8 special vertical rolling mills with the die cavities of the rolling mills from top to bottom and from big to small to control the outer diameter of a finished product within a process specified range to form a semi-finished product; the specification of the 1 st die cavity is 19.8mm, 32.0mm and 42mm, and the size of the die cavity is consistent with that of a die cavity formed by pressing a copper strip into a pipe; the 8 th die cavity specification is 33.98mm, 25.98mm and 15.9 mm;
(6) first continuous annealing
(7) Horizontal 18 passes of rolling
Adopting 18 special vertical rolling mills, wherein the size of a rolling mill die cavity is reduced from large to small, continuously rolling the semi-finished product copper pipe for the second time, controlling the outer diameter of the finished product within the range specified by the process again, reducing the wire diameter of the product again, and increasing the compaction degree of the insulating magnesia powder from small to large to form the semi-finished product with certain outer diameter and compaction degree;
(8) second continuous annealing
(9) Rolling 8-18 times horizontally
Continuously rolling the semi-finished product by using a horizontal rolling mill to reduce the outer diameter of the product again, wherein the outer diameter reaches a process specified value, the compactness of the magnesium oxide powder of the product reaches the process specified value, and the insulating electrical property is improved;
(10) repeated continuous annealing-rolling-annealing
When the outer diameter of the product, the wire diameter of the conductor and the thickness of the copper pipe do not reach the specified process value, the outer diameter of the product, the wire diameter of the conductor and the thickness of the copper pipe are controlled at the specified process value by adopting a mode of repeated continuous annealing, rolling and annealing, so that the direct current resistance of the conductor, the direct current resistance of the copper pipe, the compactness of the magnesium oxide powder, the insulating electrical property, the thickness of the copper pipe and the outer diameter of the product can meet the process requirements;
(11) finished product calibration
The final time, a drawing die is adopted to calibrate the product, so that the outer diameter of the product reaches the range specified by the process, and the minimum diameter can reach 3.0 mm; the outer diameter precision is controlled to be +/-0.01 mm.
The utility model discloses a multicore small cross-section conductor mineral insulation fireproof control cable, including copper conductor, insulation and metal sheath, the copper conductor is arranged in the metal sheath, inorganic magnesium oxide insulating material is filled between the metal sheath and the copper conductor; the metal sheath is a copper pipe, and the copper sheath adopts a TP2 type phosphorus deoxidized copper belt; the conductor, the insulation and the sheath are compact compacted bodies; the wire diameter of the control cable is smaller than 7.3mm and larger than 3.0 mm. The outer diameter of the cable can reach 3.0mm at the minimum, the precision of the outer diameter of the cable is controlled within +/-0.01 mm, the roundness is controlled within the process range, and the minimum diameter can reach 1%; the cable is a light mineral insulated multi-core small-section fireproof control cable with rated voltage of 500V or below.
The product performance is as follows:
the mineral insulation control cable can continuously supply power for 3 hours at 950-1000 ℃ due to the continuous working temperature of 250 ℃, and can work at 1083 ℃ close to the melting point of copper (the melting point of magnesium oxide is 2800 ℃) in a short time or in an abnormal time. Therefore, the method has the following characteristics:
(1) fire-proof performance
The mineral cable is made of inorganic matter (metal copper and magnesium oxide powder), so that it will not cause fire, and can not burn or support combustion, and the cable can still work normally even if there is external flame.
(2) Large current-carrying capacity
Since the normal service temperature of the mineral insulated cable can reach 250 ℃, IEC60702 specifies that the continuous working temperature of the mineral insulated cable is 105 ℃, which is a consideration for the requirements of terminal sealing materials and safety, even though its current carrying capacity is far higher than other cables, since magnesia powder has a better thermal conductivity than plastic and therefore the same working temperature, the current carrying capacity is higher.
(3) Waterproof and explosion-proof
Because the cable adopts the copper pipe as the sheath, the conductor, the insulation and the sheath are compact compacted bodies. When the overload protection circuit is overloaded, the plastic cable can cause insulation heating or breakdown due to overcurrent or overvoltage.
(4) High working temperature
The melting point temperature of the magnesium oxide of the insulating layer is far higher than that of copper, so that the normal working temperature of the cable can reach 250 ℃, and the cable can continue to operate at the temperature close to the melting point temperature of the copper within 1083 ℃ in a short time.
(5) High shielding performance
The cable copper sheath is an excellent shielding protective layer, which can prevent the interference of the cable to other cables and the interference of external magnetic fields to the cable.
(6) Long service life
The cable is made of inorganic materials, so that the cable cannot be aged and has a service life as short as more than one hundred years.
(7) Small outer diameter and light weight
Compared with the plastic cable with the same specification, the mineral insulated cable has the advantages that the outer diameter is reduced by 50 percent, the weight is reduced by 30 percent, the occupied space is reduced, and the installation is convenient.
(8) High radiation resistance
Because the cable composition materials are all inorganic substances, the electrical and mechanical properties of the cable are not changed after the cable is subjected to nuclear radiation.
(9) Safe and environment-friendly
The cable is made of inorganic materials and does not contain any organic matter.
(10) Resistance to mechanical damage
Because the metal sheath of the cable has certain strength and toughness, and the magnesium oxide is highly compressed in the cable processing process, when the cable is subjected to deformation such as bending, flattening, twisting and the like, the relative position between the core wire and the sheath is kept unchanged, short circuit cannot be generated, the electrical performance cannot be influenced, and the cable can still normally work under the condition that the outer diameter of the cable is deformed to two thirds.
(11) Good bending property
The cable has the flexibility which cannot be compared with the common plastic cable after being fully annealed.
(12) Good grounding
For mineral-insulated cables, no separate earth conductor is required as an earth conductor due to the continuity of the copper sheath and the extremely low earth resistance.
Drawings
Fig. 1 is the structure schematic diagram of the multi-core small-section conductor mineral insulation fireproof control cable of the present invention.
In the figure: 1. copper conductor 2, insulation 3, copper sheath.
Detailed Description
As shown in fig. 1, the utility model discloses a multicore small cross-section conductor mineral insulation fireproof control cable.
The technical scheme is as follows:
1. selection of materials
(1) Conductor 1: the conductor is made of high-conductivity metal copper, and is round, smooth in surface and free of burrs.
(2) Insulation 2: the insulating material is made of high-temperature-resistant and non-combustible inorganic magnesium oxide.
(3) Metal sheath 3: the copper pipe is used as a sheath, has good continuity and bending property after special processing, and can be used as a grounding wire.
2. Process scheme
(1) A conductor: the conductor with the wire diameter not larger than 4mm is formed by drawing a German Nihoff continuous annealing copper large drawing inlet device; the conductor with the wire diameter larger than 4mm is formed by adopting a continuous mechanism of a copper extruding machine, the diameter of an inlet wire copper rod of the copper extruding machine is 12.5mm, and the outer diameter of an outlet wire selects a qualified die mechanism according to a process value; the conductor is made of T1M20 type pure copper with 99.99% copper content, is a single solid annealed copper conductor required by the standard of wire and cable conductors, and has smooth surface without the defects of oil stain, burrs, sharp edges, scratches, bulges and the like.
(2) Insulation: the insulation is filled by adopting the most advanced domestic automatic filling production line of the inorganic magnesium oxide powder, and the compacted density of the magnesium oxide powder reaches 3.2g/cm3。
(3) Copper sheathing: the copper sheath is formed by seamless welding, continuous annealing and rolling of a TP2 type phosphorus deoxidized copper belt and a copper belt with the copper content of 99.99 percent.
(4) Conductor correction: the incoming line conductor is subjected to drawing correction by adopting a high-precision special die, so that the conductor is ensured to be stably incoming, the surface is smooth and free of impurities, the incoming line angle is stable and firm, and the diameter and eccentricity of a conductor monofilament and the gap between the conductor and a copper pipe meet the process requirements; the number of the high-precision special die cores comprises: 1 core, 2 cores, 3 cores, 4 cores, 5 cores, 6 cores, 7-19 cores, 3+1 cores, 3+2 cores and 4+1 cores.
(5) Pressing the copper strip into a pipe: flattening and straightening the coiled copper strip by adopting a special clamp and a die cavity to form a continuous and straight copper strip; cleaning the surface of the copper strip by adopting a special cleaning device and a cleaning agent, so as to ensure that the copper strip has no greasy dirt and impurities and the surface is clean; a special guide wheel is adopted to continuously press and form a flat copper strip along a certain radian to form a circular tube with a certain outer diameter, and the joint opening of the formed copper strip is ensured to be on a flat straight line, the joint surface is free from oil stain impurities, and is smooth and flat; the specifications of the die cavities are 19.8mm, 32.0mm and 42mm, the total number of the die cavities is 3, and the proper die cavities can be selected according to the size of the line diameter of a product; the size of the die cavity can be adjusted and replaced according to the requirements of the process.
(6) Insulating pouring: the most advanced domestic automatic powder filling device of inorganic magnesium oxide is adopted to accurately fill the magnesium oxide powder into the formed copper pipe, so that the continuous filling of the magnesium oxide powder is ensured, and no gap exists in the copper pipe; the automatic powder filling device is automatically provided with a magnetic filter screen, so that the added inorganic matter magnesium oxide powder material is clean and is not doped with magnetic substances, the electrical insulation performance of the magnesium oxide powder is influenced, and the safety and reliability of electrical insulation are ensured; the addition mode and the form of the inorganic magnesium oxide powder can be added according to the process requirements and the actual conditions of the materials.
(7) And (3) continuous welding: an imported special argon arc welding machine is adopted to firmly weld the joint of the copper pipe to form a seamless complete copper pipe; the current of the argon arc welding machine is controlled to be 80-300A, so that the phenomenon that the over-welding scorching is caused, the welding slag is formed, and the insulating electrical performance is influenced is avoided; the special argon arc welding machine is provided with an automatic tracking system, automatic tracking and accurate welding are carried out according to the position of the joint of the copper strip, continuous welding of the copper strip is ensured, and the welded joint is firm and has no leak.
(8) Continuous knocking: and a special vibration beater is adopted to continuously beat the copper pipe after powder pouring at a certain frequency, so that the magnesium oxide powder is guaranteed to be poured and compacted tightly, and the compaction density of the magnesium oxide powder is increased, so that the insulating electrical performance is improved.
(9) And (3) vertical 8-pass rolling: and 8 special vertical rolling mills are adopted, the die cavities of the rolling mills are from top to bottom and are gradually reduced, the copper pipe after powder filling is continuously rolled, the outer diameter of a finished product is controlled within a process specified range, the outer diameter of the product is ensured to be accurate and error-free, and a semi-finished product is formed. The specification of the 1 st die cavity is 19.8mm, 32.0mm and 42mm, and the size of the die cavity is consistent with that of the die cavity for pressing the copper strip into the tube (5); the 8 th die cavity specification is 33.98mm, 25.98mm and 15.9mm, and the design of the die cavity size can be adjusted, revised and replaced according to the ductility of the copper pipe and the material of the copper belt; a proper die cavity can be selected according to the size of the line diameter of the product; the size of the die cavity can be adjusted and replaced according to the requirements of the process.
(10) First continuous annealing: after the phosphorus deoxidized copper pipe is rolled by 8 vertical rolling mills, the tensile strength of the copper pipe is increased, the volume resistivity at 20 ℃ is increased, the material of the copper pipe is hardened, the residual stress is large, the ductility is poor, and a continuous annealing process is adopted for reducing the volume resistivity at 20 ℃, reducing the tensile strength, eliminating the residual stress and improving the flexibility and the ductility of the copper pipe.
(11) Horizontal 18 rolling: and (3) adopting 18 special vertical rolling mills, wherein the size of a rolling mill die cavity is reduced from large to small, continuously rolling the semi-finished product copper pipe for the second time, controlling the outer diameter of the finished product within the range specified by the process again, reducing the wire diameter of the product again, and increasing the compaction degree of the insulating magnesia powder from small to large to form the semi-finished product with certain outer diameter and compaction degree.
(12) And (3) second continuous annealing: the purpose of the second continuous annealing is consistent with that of the first continuous annealing, the volume resistivity at 20 ℃ is reduced, the tensile strength is reduced, the residual stress is eliminated, and the flexibility and the ductility of the copper pipe are improved.
(13) Horizontal rolling for 8-18 times: the purpose of rolling 8-18 horizontal rolls is consistent with that of rolling 18 horizontal rolls, the semi-finished product is continuously rolled by a horizontal rolling mill, the outer diameter of the product is reduced again, the outer diameter reaches a process specified value, the compactness of the magnesium oxide powder of the product reaches the process specified value, and the insulating electrical performance is improved. And the middle of the rolling mill is corrected by adopting a die, so that the rolled copper pipe is ensured to be round, and the ovality of the product meets the standard requirement.
(14) Repeated continuous annealing-rolling-annealing: and when the outer diameter of the product, the wire diameter of the conductor and the thickness of the copper pipe do not reach the specified process value, the outer diameter of the product, the wire diameter of the conductor and the thickness of the copper pipe are controlled at the specified process value by adopting a mode of repeated continuous annealing, rolling and annealing, so that the direct current resistance of the conductor, the direct current resistance of the copper pipe, the compactness of the magnesium oxide powder, the insulating electrical property, the thickness of the copper pipe and the outer diameter of the product can meet the process requirements.
(15) And (3) finished product calibration: the final time, a drawing die is adopted to calibrate the product, so that the outer diameter of the product reaches the range specified by the process, and the minimum diameter can reach 3.0 mm; the outer diameter precision is controlled to be +/-0.01 mm.
The design of above structure adopts copper strips to indulge the package argon arc welding and pricks high frequency annealing production line production in succession, and the solid copper conductor of conductor annealing, great increase the tensile properties of less external diameter cable. The insulating and copper sheath is made of inorganic (magnesium oxide and copper) materials, so that the fire resistance of the cable is improved, and the cable can still normally work at the temperature of 1083 ℃ close to the melting point of copper in a short period.
The design mode can save space and human resources to the maximum extent, and actually proves that only 3 persons are needed to produce qualified cables at one time, and the lengths of the cables can be produced according to the requirements of customers, so that the construction and installation difficulty of the customers is reduced to a great extent, and the using number of special joints is effectively reduced.
The patent relates to a production technology of a light mineral insulated fireproof cable with a multi-core small-section conductor, which relates to continuous argon arc welding and multiple continuous annealing rolling, wherein 8 continuous vertical rolling and 18 continuous annealing horizontal rolling are adopted for the first time, the outer diameter of the cable is rolled to 8.3mm, 8-18 continuous annealing horizontal rolling are adopted for the second time, the outer diameter of the cable is controlled within a process range, and the minimum outer diameter can reach 3.0 mm; performing continuous annealing and rolling twice, performing line diameter calibration by adopting a plurality of drawing dies in the middle of a rolling mill, controlling the precision of the outer diameter of the cable to be +/-0.01 mm, and controlling the roundness to be within the process range, wherein the minimum diameter can reach 1%; the technology is suitable for continuous large-scale industrial production of the light mineral insulated multi-core small-section fireproof control cable with the rated voltage of 500V or below.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A multi-core small-section conductor mineral insulation fireproof control cable is characterized by comprising copper conductors, insulation and a metal sheath, wherein a plurality of copper conductors are longitudinally arranged in the metal sheath, and an inorganic magnesium oxide insulating material is filled between the metal sheath and the copper conductors; the metal sheath is a copper pipe, and the copper sheath adopts a TP2 type phosphorus deoxidized copper belt; the conductor, the insulation and the sheath are compact compacted bodies; the wire diameter of the control cable is smaller than 7.3mm and larger than 3.0 mm.
2. The multi-core small-section conductor mineral insulation fireproof control cable as claimed in claim 1, wherein the conductor is made of T1M20 type pure copper with 99.99% copper content, and is a single solid annealed copper conductor required by wire and cable conductor standards.
3. The multi-core small cross-section conductor mineral-insulated fire-protection control cable of claim 1, wherein the compacted density of the magnesium oxide powder is up to 3.2g/cm3。
4. The multi-core small-cross-section conductor mineral-insulated fireproof control cable of claim 1, wherein the copper sheath is formed by seamless welding and continuous annealing rolling of a copper strip with a copper content of 99.99%.
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| CN202120810042.7U CN214956208U (en) | 2021-04-20 | 2021-04-20 | Mineral insulation fireproof control cable with multi-core small-section conductor |
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| CN202120810042.7U CN214956208U (en) | 2021-04-20 | 2021-04-20 | Mineral insulation fireproof control cable with multi-core small-section conductor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114334257A (en) * | 2021-12-30 | 2022-04-12 | 山东菲达电力科技股份有限公司 | Intrinsic safety type fire-resistant mineral insulated cable, cable stripping device and using method thereof |
| CN115295228A (en) * | 2022-08-22 | 2022-11-04 | 特变电工山东鲁能泰山电缆有限公司 | 1kV rigid mineral insulation fireproof cable |
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2021
- 2021-04-20 CN CN202120810042.7U patent/CN214956208U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114334257A (en) * | 2021-12-30 | 2022-04-12 | 山东菲达电力科技股份有限公司 | Intrinsic safety type fire-resistant mineral insulated cable, cable stripping device and using method thereof |
| CN114334257B (en) * | 2021-12-30 | 2023-09-19 | 山东菲达电力科技股份有限公司 | Intrinsic safety type fireproof mineral insulated cable, cable stripping device and use method thereof |
| CN115295228A (en) * | 2022-08-22 | 2022-11-04 | 特变电工山东鲁能泰山电缆有限公司 | 1kV rigid mineral insulation fireproof cable |
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