CN117877810A - Device and method for accelerating degassing speed of XLPE insulated wire core - Google Patents
Device and method for accelerating degassing speed of XLPE insulated wire core Download PDFInfo
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- CN117877810A CN117877810A CN202410078212.5A CN202410078212A CN117877810A CN 117877810 A CN117877810 A CN 117877810A CN 202410078212 A CN202410078212 A CN 202410078212A CN 117877810 A CN117877810 A CN 117877810A
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- 238000007872 degassing Methods 0.000 title claims abstract description 91
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 88
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 85
- 238000009413 insulation Methods 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims abstract description 28
- 239000004020 conductor Substances 0.000 claims description 41
- 239000010410 layer Substances 0.000 claims description 36
- 238000009423 ventilation Methods 0.000 claims description 23
- 239000006227 byproduct Substances 0.000 claims description 20
- 150000003384 small molecules Chemical class 0.000 claims description 16
- 239000010949 copper Substances 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000012790 adhesive layer Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000004132 cross linking Methods 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 17
- 239000004698 Polyethylene Substances 0.000 description 10
- 150000002978 peroxides Chemical class 0.000 description 9
- 238000004026 adhesive bonding Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000010382 chemical cross-linking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OIGWAXDAPKFNCQ-UHFFFAOYSA-N 4-isopropylbenzyl alcohol Chemical compound CC(C)C1=CC=C(CO)C=C1 OIGWAXDAPKFNCQ-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010960 commercial process Methods 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000002081 peroxide group Chemical group 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0036—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Of Electric Cables (AREA)
Abstract
The invention relates to the technical field of cable manufacture, in particular to a device and a method for accelerating degassing speed of XLPE insulated wire cores. The invention discloses a device for accelerating degassing speed of XLPE insulated wire cores, which comprises fluid equipment, wherein the fluid equipment is in sealing connection with the insulated wire cores through an air duct, and a heat sealing cap is arranged between the air duct and the insulated wire cores in a sealing way; the fluid device is connected with the air duct in a sealing way through the air tap. The invention solves the technical problem of providing a device and a method for accelerating the degassing speed of an XLPE insulated wire core, which can reduce the time for degassing after XLPE insulation crosslinking.
Description
Technical Field
The invention relates to the technical field of cable manufacture, in particular to a device and a method for accelerating degassing speed of XLPE insulated wire cores.
Background
Crosslinked polyethylene (XLPE) is a thermoset made by mixing Low Density Polyethylene (LDPE) with a crosslinking agent, such as a peroxide. After crosslinking, the molecular chains of PE are cross-linked to form a three-dimensional network structure, and after crosslinking, the PE is in a non-melted substance as XLPE is a large-size molecule, so that the heat resistance is obviously improved, the long-term use temperature of the XLPE is 95-100 ℃, and the long-term allowable working temperature of the XLPE cable can reach 90 ℃. The intermolecular chain frames up chemical chain bridges, and the physical and mechanical properties of XLPE are improved, in particular hardness, rigidity, wear resistance, creep resistance and dimensional stability. In a word, after crosslinking, the mechanical property and the thermal property of XLPE are greatly improved, so that the thermoplastic PE has the same good electrical property as the thermoplastic PE, and has good mechanical property at high temperature, and the comprehensive performance of the thermoplastic PE is improved. XLPE is currently widely used for low, medium and high voltage cable insulation. Currently, there are three main commercial processes for PE crosslinking, including: chemical crosslinking (peroxide crosslinking), irradiation crosslinking, and warm water crosslinking (silane crosslinking). The peroxide XLPE has the advantages of wide application, strong adaptability, simple processing technology, easy operation and the like, thereby obtaining wide industrial application. Currently, the peroxide crosslinking process is adopted for industrially producing XLPE insulated power cables of 35kV and above.
Peroxide chemical crosslinking was used by the american GE company in 1957 and first invented a crosslinked polyethylene insulated power cable. Peroxide crosslinking, also known as chemical crosslinking, crosslinks polyethylene by the decomposition of peroxide at high temperature to initiate a series of radical reactions. The reaction process is approximately as follows: the peroxide decomposes under the condition of heating to form free radicals, and the free radicals can rapidly move in the polyethylene due to the high activity of the free radicals, and when the peroxide hits against the macromolecular chains of the polyethylene, hydrogen atoms on the macromolecular chains are extracted, so that macromolecular chain free radicals are formed. The macromolecular chain free radicals of polyethylene have strong reactivity, and when the two macromolecular chain free radicals meet, the two macromolecular chain free radicals react with each other to be combined, and the energy is released to form chemical bonds among macromolecular chains to be crosslinked.
Thus, peroxide crosslinked cables have some decomposition byproducts remaining in the insulation, including cumyl alcohol, methane, acetophenone, α -methylstyrene, water, and the like. Problems arise during use with increasing XLPE cable voltage ratings, such as gas accumulating in the cable jacket causing the jacket to deform under pressure; the gas moves to the cable terminal along the cable to generate pressure so as to cause the phenomenon of accessory falling or bulge; when the electric saw cuts the cable end, sparks can ignite combustible materials in the cable to cause accidents and the like, and the accidents are caused by gradual release of incompletely removed methane in the operation process of the cable. The byproducts can also form defects such as air holes or impurities in insulation, and partial discharge phenomenon is generated in the operation process, so that the insulation dielectric loss is increased, the mechanical property is reduced, and the service life of the cable is influenced. In order to avoid accident potential and improve XLPE insulation electrical performance, the insulated wire core is required to be subjected to degassing treatment after LXPE insulation crosslinking, all medium voltage cables are required to be placed in a factory for 7 days after being produced in the ANSI/ICEA S-94-649-2004 standard, and gas is naturally removed. The degassing time of byproducts of the high-voltage class XLPE cable with larger insulation thickness at room temperature is longer, and the production delivery time of the high-voltage class XLPE insulated cable is generally compromised.
Accordingly, one skilled in the art has been working to develop an apparatus and method for accelerating the degassing speed of XLPE insulated wire cores that reduces the time it takes to degas after XLPE insulation crosslinking.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention discloses a device and a method for accelerating the degassing speed of an XLPE insulation wire core, and aims to provide a device and a method for accelerating the degassing speed of an XLPE insulation wire core, which can reduce the time for degassing after XLPE insulation crosslinking.
In order to achieve the above purpose, the invention provides a device for accelerating the degassing speed of an XLPE insulated wire core, which comprises fluid equipment, wherein the fluid equipment is in sealing connection with the insulated wire core through an air duct, and a heat sealing cap is arranged between the air duct and the insulated wire core in a sealing way; the fluid device is connected with the air duct in a sealing way through the air tap.
Preferably, the fluid device is a vacuum machine or a blower, the vacuum machine or the blower is used for vacuumizing or blowing air to the inner conductor of the insulated wire core, so as to accelerate the ventilation speed of the gas which is volatilized inwards in the inner space of the insulated wire core, and the ventilation speed is more than or equal to 1 time/s. The prior art center is only for degassing, i.e. macroscopic degassing, of the gas emitted outside, i.e. radially outwards, of the insulating wire core. The twisted insulating wire core is provided with a gap in the conductor, and the prior art has no technical scheme for treating the crosslinking byproducts in the conductor, so that the degassing treatment of the crosslinking byproducts in the insulating inner space is omitted. In the scheme, the inner end of the insulating wire core is opened, vacuumizing or blowing is carried out by connecting a vacuum machine or a blower, and the external separation of crosslinking byproducts of small molecules is accelerated by increasing the air flow of the inner space, so that the degassing is more thorough, and the overall degassing speed is greatly improved.
Preferably, at the ventilation speed, the ventilation frequency is calculated as follows:
wherein,
n is the ventilation times, times/s;
f is wind speed, m/s;
S air tap Is the cross section area of the inner hole of the air tap, mm 2 ；
η is the air volume efficiency of the fluid device,%;
r is the diameter of a copper conductor, and mm;
S copper (Cu) For the actual cross-sectional area of the copper conductor, mm 2 ；
L is the length of the insulated wire core, and m.
Preferably, the fluid device is a vacuum machine, and seals the inner end of the insulated wire core; the vacuum machine is used for carrying out vacuumizing treatment on the inner conductor of the insulated wire core, so that the internal gap of the conductor reaches negative pressure of 0.2MPa or more, and the degassing effect is accelerated.
Preferably, the inner end of the insulating wire core is connected with a sealing cap, and a glue layer is coated between the sealing cap and the insulating wire core. When in sealing, the sealing cap which can be contracted by heating is used for sealing, and the inner wall of the sealing cap is coated with glue, so that the sealing purpose is achieved. The sealing cap has the advantages that the sealing cap can achieve the effect of firm sealing only when the sealing cap is matched with the insulating wire core in a better mode in terms of inner diameter, wall thickness, length and gluing length.
The inner diameter of the sealing cap is too large, and the sealing cap is not tightly attached to the surface of the insulated wire core after shrinkage, so that the sealing effect is not achieved; the inner diameter of the sealing cap is too small, and the glue smeared on the inner wall of the sealing cap is not melted when the sealing cap is attached to the insulated wire core, so that the sealing effect cannot be achieved. The sealing cap is too thin, and is easy to break when heated; the sealing cap is too thick, the time required for heat transfer to the inner wall adhesive layer is long, and the outer surface of the sealing cap is easy to burn. The sealing cap is too short, and the effective bonding length is not enough to achieve the sealing effect; the sealing cap is too long and the cost of the sealing cap is increased. The gluing length is too short, and the effective bonding length is not enough to achieve the sealing effect; the gluing length is overlong, the cost of the sealing cap is increased, and molten glue possibly flows into the conductor to influence the cable performance, and after the finished cable is processed, the glued part of the conductor is sawed off, so that the production cost of the cable is increased.
The preferred fit is as follows:
preferably, a glue layer is coated between the heat sealing cap and the insulating wire core.
The invention also provides a method for accelerating the degassing speed of the XLPE insulated wire core, wherein the insulated wire core sequentially comprises a conductor, a conductor shielding, insulation and an insulation shielding from inside to outside, and the method comprises the following three schemes:
1) For the gas E volatilized radially outwards of the insulating shield: heating the whole disc of insulating wire core to accelerate the flow of small molecule byproducts;
2) The gas which is volatilized outwards comprises gas D which is volatilized outwards axially towards the two end faces of the insulating wire core and gas E which is volatilized outwards towards the radial insulating shielding: the external closed space where the whole disc insulating wire core is positioned is quickly ventilated, so that the content of small molecules in the environment is reduced, and the flow of small molecule byproducts is accelerated;
3) For the gas F volatilized radially inwards of the conductor: the device for accelerating the degassing speed of the XLPE insulated wire core is adopted to vacuumize or blow the inner conductor of the whole disc insulated wire core, so that the flowing speed of air in the insulated inner space is accelerated.
Preferably, when the scheme 1) is adopted, the whole disc of the insulating wire core is placed in the degassing chamber, and the temperature of the degassing chamber is set as follows:
for the XLPE insulated wire core of 10kV, when the layer number L of the XLPE insulated wire core is more than 13, the degassing temperature is 58-62 degrees; when the layer number L of the XLPE insulated wire core is less than or equal to 13 layers, the degassing temperature is 68-72 ℃;
for the XLPE insulated wire core of 35kV, when the layer number L of the XLPE insulated wire core is more than 10 layers, the degassing temperature is 58-62 degrees; when the layer number L of the XLPE insulated wire core is less than or equal to 10 layers, the degassing temperature is 68-72 ℃;
for the XLPE insulated wire core of 110kV, when the layer number L of the XLPE insulated wire core is more than 6, the degassing temperature is 58-62 degrees; when the layer number L of the XLPE insulated wire core is less than or equal to 6 layers, the degassing temperature is 68-72 ℃;
for the XLPE insulated wire core of 220kV, the degassing temperature is 58-62 degrees.
Preferably, when the scheme 2) is adopted, the whole disc of the insulation wire core is placed in an airtight insulation degassing chamber with a heat preservation function, the insulation degassing chamber is provided with a ventilation device, and the ventilation device can achieve ventilation frequency of 6 times/h; the air suction opening of the air interchanger is arranged above the insulation degassing chamber, and the air supplementing opening of the air interchanger is arranged below the insulation degassing chamber. The ventilator may be supplied with fresh air by a blower, and the exhaust fan exhausts the air mixed with the exhaust gas.
Preferably, when the insulated wire core is used for the land XLPE cable, the length/height and width of the insulated degassing chamber are 1.2-1.5 times of the diameter and width of the cable drum; when the insulated wire core is used for the marine XLPE cable, the length/width and the height of the insulated degassing chamber are 1.1-1.3 times of the diameter and the height of the cable reel.
The beneficial effects of the invention are as follows:
the XLPE insulated wire core is in a ring-shaped cylinder shape in space, the inner space occupies most space by a conductor, the space for the air volatilized and emitted by the small molecule byproducts is small, the fluidity of the small molecule byproducts is poor, the speed of the small molecule byproducts volatilizing and emitting along the inner surface is accelerated, a section of the XLPE insulated wire core is connected with fluid equipment in a sealing manner, the fluid equipment can be a blower or a vacuumizing machine, and the air blowing or vacuumizing treatment is carried out on the inner conductor of the whole insulated wire core so as to achieve the effect of accelerating the air flow of the inner space. The internal space is narrow, the air circulation channel is blocked, and in order to improve the effect, the power and the air flow rate of the blower or the vacuumizer need to achieve that the ventilation frequency of the internal space (containing the conductor) reaches more than 50 times/h. According to the invention, the air tap, the air duct and the heat sealing cap are arranged, so that the connection between the insulating wire core and the fluid equipment is sealed, and the air leakage problem is prevented.
Drawings
FIG. 1 is a schematic diagram of an embodiment 1 of the apparatus of the present invention for accelerating the degassing speed of XLPE insulated wire cores;
FIG. 2 is a schematic diagram of an embodiment 2 of the apparatus of the present invention for accelerating the degassing speed of XLPE insulated wire cores;
FIG. 3 is an enlarged schematic view of a portion of FIG. 1 at A;
FIG. 4 is an enlarged schematic view of a portion of FIG. 1 at B;
FIG. 5 is an enlarged schematic view of a portion of FIG. 2 at C;
fig. 6 is a gas volatilization routing diagram of the method of accelerating the degassing speed of XLPE insulated wire cores of the present invention.
In the above figures: 1. an insulated wire core; 11. a conductor; 12. a conductor shield; 13. insulating; 14. an insulating shield; 2. a fluid device; 21. a vacuum machine; 3. an air duct; 4. a heat sealing cap; 5. an air tap; 6. a sealing cap; 7. and (5) a glue layer.
Detailed Description
The present invention will be further described with reference to the drawings and examples, and it should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 to 5, the invention provides a device for accelerating degassing speed of an XLPE insulation wire core, which comprises a fluid device 2, wherein the fluid device 2 is in sealing connection with the insulation wire core 1 through an air duct 3, a heat sealing cap 4 is arranged between the air duct 3 and the insulation wire core 1 in a sealing way, and a glue layer 7 is coated between the heat sealing cap 4 and the insulation wire core 1. The fluid device 2 is connected with the air duct 3 in a sealing way through the air tap 5, and the air duct 3 is connected with the heat sealing cap 4 in a sealing way.
In the above embodiment, the XLPE insulation wire core is in a ring-shaped cylinder shape in space, the inner space occupies most space by the conductor, the space for the air volatilized by the small molecule by-product is small, the fluidity of the small molecule by-product is poor, in order to accelerate the speed of the small molecule by-product volatilized along the inner surface, a section of the XLPE insulation wire core 1 is connected with the fluid device 2 in a sealing manner, the fluid device 2 can be a blower or a vacuumizer 21, and the air blowing or vacuuming treatment is performed on the inner conductor of the whole insulation wire core 1, so as to achieve the effect of accelerating the air flow of the inner space. The internal space is narrow and the air passage is blocked, and in order to improve the effect, the power and air flow rate of the blower or vacuumizer 21 are required to be such that the number of ventilation times of the internal space (including the conductor) is more than 50 times/h. According to the invention, the air tap 5, the air duct 3 and the heat sealing cap 4 are arranged, so that the connection between the insulated wire core 1 and the fluid equipment 2 is sealed, and the air leakage problem is prevented.
Specifically, the device for accelerating the degassing speed of the XLPE insulated wire core 1 can be realized in different modes, and specific embodiments are as follows:
example 1
As shown in fig. 1, the fluid device 2 of the invention is a vacuum machine 21 or a blower, and the vacuum machine 21 or the blower is used for vacuumizing or blowing air to the inner conductor of the insulated wire core 1, so as to accelerate the air exchanging speed of the air which is volatilized inwards and out radially in the insulated inner space, and the air exchanging speed is more than or equal to 1 time/s. The prior art center is only for degassing, i.e. macroscopically degassing, of the gas emitted outside, i.e. radially outwards, of the insulating wire core 1. The twisted insulated wire core 1 is provided with a gap in the conductor, and the prior art has no technical scheme for treating the crosslinking byproducts in the conductor, so that the degassing treatment of the crosslinking byproducts in the insulated inner space is omitted. In this scheme, the inner of insulating sinle silk 1 is opened, carries out evacuation or blowing through connecting vacuum machine 21 or air-blower, through the air flow of increase inner space, accelerates the outside separation of the crosslinked accessory substance of micromolecule to the degassing is more thorough, and has improved holistic degassing speed greatly.
At the above ventilation speed, the calculation formula of the ventilation times is as follows:
wherein,
n is the ventilation times, times/s;
f is wind speed, m/s;
S air tap Is the cross section area of an inner hole of the air tap 5 mm 2 ；
η is the air volume efficiency of the fluid device 2,%;
r is the diameter of a copper conductor, and mm;
S copper (Cu) For the actual cross-sectional area of the copper conductor, mm 2 ；
L is the length of the insulated wire core 1, m.
Example 2
As shown in fig. 2, the fluid device 2 of the present invention is a vacuum machine 21, and seals the inner end of the insulated wire core 1; the vacuum machine 21 is used for vacuumizing the inner conductor of the insulated wire core 1 to enable the internal gap of the conductor to reach negative pressure of 0.2MPa or more, and the degassing effect is accelerated. Specifically, the inner end of the insulated wire core 1 can be sealed by adopting a sealing cap 6, namely, the inner end of the insulated wire core 1 is connected with the sealing cap 6, and a glue layer 7 is coated between the sealing cap 6 and the insulated wire core 1. When in sealing, the sealing cap 6 which can be contracted by heating is used for sealing, and the inner wall of the sealing cap 6 is coated with glue, so that the sealing purpose is achieved. The sealing cap 6 has the advantages of firm sealing effect only when the inner diameter, the wall thickness, the length and the gluing length are matched with the insulating wire core 1.
The inner diameter of the sealing cap 6 is too large, and the sealing cap is not tightly attached to the surface of the insulated wire core 1 after shrinkage, so that the sealing effect is not achieved; the inner diameter of the sealing cap 6 is too small, and the glue smeared on the inner wall of the sealing cap 6 is not melted when the sealing cap 6 is attached to the insulated wire core 1, so that the sealing effect cannot be achieved. The sealing cap 6 is too thin, and the sealing cap 6 is easy to break when heated; the sealing cap 6 is too thick, and the time required for heat transfer to the inner wall adhesive layer 7 is long, so that the outer surface of the sealing cap 6 is easily burnt. The sealing cap 6 is too short, and the effective bonding length is insufficient to achieve the sealing effect; the sealing cap 6 is excessively long, and the cost of the sealing cap 6 increases. The gluing length is too short, and the effective bonding length is not enough to achieve the sealing effect; the gluing length is overlong, the cost of the sealing cap 6 is increased, and the melted glue possibly flows into the conductor to influence the cable performance, and after the finished cable is processed, the glued part of the conductor is sawed off, so that the cable production cost is increased.
The preferred fit is as follows:
as shown in fig. 6, the invention further provides a method for accelerating degassing speed of an XLPE insulated wire core, wherein the insulated wire core 1 sequentially comprises a conductor 11, a conductor shield 12, an insulation 13 and an insulation shield 14 from inside to outside, and the method comprises the following three schemes:
1) For gas E that swings radially outward of the insulating shield 14: heating the whole disc insulating wire core 1 to accelerate the flow of small molecule byproducts;
2) The gas which is volatilized outwards comprises gas D which is volatilized outwards axially towards the two end faces of the insulated wire core 1 and gas E which is volatilized outwards towards the radial insulated shielding 14: the external closed space where the whole disc insulating wire core 1 is positioned is quickly ventilated, so that the content of small molecules in the environment is reduced, and the flow of small molecule byproducts is accelerated;
3) For the gas F volatilized radially inward of the conductor 11: the device for accelerating the degassing speed of the XLPE insulated wire core is adopted to vacuumize or blow the inner conductor of the whole disc insulated wire core, so that the flowing speed of air in the insulated inner space is accelerated.
Specifically, when adopting scheme 1), place whole dish insulation sinle silk 1 in the degassing chamber, set up as follows to the temperature of degassing chamber:
for the XLPE insulated wire core of 10kV, when the layer number L of the XLPE insulated wire core is more than 13, the degassing temperature is 58-62 degrees; when the layer number L of the XLPE insulated wire core is less than or equal to 13 layers, the degassing temperature is 68-72 ℃;
for the XLPE insulated wire core of 35kV, when the layer number L of the XLPE insulated wire core is more than 10 layers, the degassing temperature is 58-62 degrees; when the layer number L of the XLPE insulated wire core is less than or equal to 10 layers, the degassing temperature is 68-72 ℃;
for the XLPE insulated wire core of 110kV, when the layer number L of the XLPE insulated wire core is more than 6, the degassing temperature is 58-62 degrees; when the layer number L of the XLPE insulated wire core is less than or equal to 6 layers, the degassing temperature is 68-72 ℃;
for the XLPE insulated wire core of 220kV, the degassing temperature is 58-62 degrees.
When the scheme 2) is adopted, the whole disc of insulating wire cores are placed in an airtight insulating degassing chamber with a heat preservation function, and the insulating degassing chamber is provided with a ventilation device, so that the ventilation frequency of the ventilation device can reach 6 times/h; the air suction opening of the air interchanger is arranged above the insulation degassing chamber, and the air supplementing opening of the air interchanger is arranged below the insulation degassing chamber. The ventilator may be supplied with fresh air by a blower, and the exhaust fan exhausts the air mixed with the exhaust gas. When the insulated wire core is used for the XLPE cable for land use, the length/height and width of the insulated degassing chamber are 1.2-1.5 times of the diameter and width of the cable reel; when the insulated wire core is used for the marine XLPE cable, the length/width and the height of the insulated degassing chamber are 1.1-1.3 times of the diameter and the height of the cable reel.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The utility model provides a device of speed of degassing of XLPE insulation sinle silk which characterized in that: the device comprises a fluid device (2), wherein the fluid device (2) is connected with an insulating wire core (1) in a sealing way through an air duct (3), and a heat sealing cap (4) is arranged between the air duct (3) and the insulating wire core (1) in a sealing way; the fluid device (2) is in sealing connection with the air duct (3) and the air duct (3) is in sealing connection with the heat sealing cap (4) through the air tap (5).
2. The apparatus for accelerating the degassing speed of XLPE insulated wire cores of claim 1, wherein: the fluid device (2) is a vacuum machine (21) or an air blower, the vacuum machine (21) or the air blower is used for vacuumizing or blowing the inner conductor of the insulated wire core (1) to accelerate the ventilation speed of gas emitted by inward radial volatilization in the insulated inner space, and the ventilation speed is more than or equal to 1 time/s.
3. A device for accelerating the degassing speed of XLPE insulated wire cores according to claim 2, wherein: at the ventilation speed, the calculation formula of the ventilation times is as follows:
wherein,
n is the ventilation times, times/s;
f is wind speed, m/s;
S air tap Is the cross section area of an inner hole of the air tap (5), mm 2 ；
η is the air volume efficiency of the fluid device (2)%;
r is the diameter of a copper conductor, and mm;
S copper (Cu) For the actual cross-sectional area of the copper conductor, mm 2 ；
L is the length of the insulated wire core (1), and m.
4. The apparatus for accelerating the degassing speed of XLPE insulated wire cores of claim 1, wherein: the fluid device (2) is a vacuum machine (21) and seals the inner end of the insulated wire core; the vacuum machine (21) is used for carrying out vacuumizing treatment on the inner conductor (11) of the insulated wire core (1) so that the internal gap of the conductor reaches negative pressure of 0.2MPa or more.
5. The apparatus for accelerating the degassing speed of XLPE insulated wire cores of claim 4, wherein: the inner end of the insulated wire core (1) is connected with a sealing cap (6), and a glue layer (7) is coated between the sealing cap (6) and the insulated wire core (1).
6. The apparatus for accelerating the degassing speed of XLPE insulated wire cores of claim 1, wherein: an adhesive layer (7) is coated between the heat sealing cap (4) and the insulating wire core (1).
7. A method for accelerating degassing speed of XLPE insulated wire cores is characterized by comprising the following steps: the method comprises the following three schemes:
1) For the gas E which volatilizes radially outwards of the insulating shield (14): heating the whole disc of insulating wire core to accelerate the flow of small molecule byproducts;
2) The gas which is volatilized outwards comprises gas D which is volatilized outwards axially towards the two end faces of the insulating wire core and gas E which is volatilized outwards towards the radial insulating shielding: the external closed space where the whole disc insulating wire core is positioned is quickly ventilated, so that the content of small molecules in the environment is reduced, and the flow of small molecule byproducts is accelerated;
3) For the gas F volatilized radially inwards of the conductor: the device for accelerating the degassing speed of the XLPE insulated wire core according to any one of claims 1 to 5 is used for vacuumizing or blowing the inner conductor of the whole disc insulated wire core, so that the flow speed of air in the insulated inner space is accelerated.
8. A method for accelerating the degassing speed of XLPE insulated wire cores as claimed in claim 7, wherein:
when the scheme 1) is adopted, the whole disc of insulating wire cores is placed in a degassing chamber, and the temperature of the degassing chamber is set as follows:
for the XLPE insulated wire core of 10kV, when the layer number L of the XLPE insulated wire core is more than 13, the degassing temperature is 58-62 degrees; when the layer number L of the XLPE insulated wire core is less than or equal to 13 layers, the degassing temperature is 68-72 ℃;
for the XLPE insulated wire core of 35kV, when the layer number L of the XLPE insulated wire core is more than 10 layers, the degassing temperature is 58-62 degrees; when the layer number L of the XLPE insulated wire core is less than or equal to 10 layers, the degassing temperature is 68-72 ℃;
for the XLPE insulated wire core of 110kV, when the layer number L of the XLPE insulated wire core is more than 6, the degassing temperature is 58-62 degrees; when the layer number L of the XLPE insulated wire core is less than or equal to 6 layers, the degassing temperature is 68-72 ℃;
for the XLPE insulated wire core of 220kV, the degassing temperature is 58-62 degrees.
9. A method for accelerating the degassing speed of XLPE insulated wire cores as claimed in claim 7, wherein: when the scheme 2) is adopted, the whole disc of insulation wire cores are placed in an airtight insulation degassing chamber with a heat preservation function, and the insulation degassing chamber is provided with a ventilation device which can achieve ventilation frequency of 6 times/h; the air suction opening of the air interchanger is arranged above the insulation degassing chamber, and the air supplementing opening of the air interchanger is arranged below the insulation degassing chamber.
10. A method for accelerating the degassing speed of XLPE insulated wire cores as claimed in claim 9, wherein: when the insulated wire core is used for the XLPE cable for land use, the length/height and width of the insulated degassing chamber are 1.2-1.5 times of the diameter and width of the cable reel; when the insulated wire core is used for the marine XLPE cable, the length/width and the height of the insulated degassing chamber are 1.1-1.3 times of the diameter and the height of the cable reel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410078212.5A CN117877810A (en) | 2024-01-19 | 2024-01-19 | Device and method for accelerating degassing speed of XLPE insulated wire core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410078212.5A CN117877810A (en) | 2024-01-19 | 2024-01-19 | Device and method for accelerating degassing speed of XLPE insulated wire core |
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| Publication Number | Publication Date |
|---|---|
| CN117877810A true CN117877810A (en) | 2024-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410078212.5A Pending CN117877810A (en) | 2024-01-19 | 2024-01-19 | Device and method for accelerating degassing speed of XLPE insulated wire core |
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| Country | Link |
|---|---|
| CN (1) | CN117877810A (en) |
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2024
- 2024-01-19 CN CN202410078212.5A patent/CN117877810A/en active Pending
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