CN214336364U - Underground cable for airport navigation light circuit - Google Patents
Underground cable for airport navigation light circuit Download PDFInfo
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- CN214336364U CN214336364U CN202022603802.5U CN202022603802U CN214336364U CN 214336364 U CN214336364 U CN 214336364U CN 202022603802 U CN202022603802 U CN 202022603802U CN 214336364 U CN214336364 U CN 214336364U
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Abstract
A buried cable for an airport navigation light circuit comprises a conductor, an inner insulating layer, a middle insulating layer, an outer insulating layer, a shielding layer and an outer sheath, wherein the inner insulating layer, the middle insulating layer, the outer insulating layer, the shielding layer and the outer sheath are wrapped outside the conductor from inside to outside; the cross-sectional area of the conductor is 6mm2(ii) a The inner insulating layer is made of a semiconductive shielding material, the average thickness of the inner insulating layer is 0.18mm, and the minimum thickness of the inner insulating layer is 0.15 mm; middle insulationThe layer is made of cross-linked polyethylene material or waterproof tree cross-linked polyethylene material or ethylene propylene rubber material, the nominal thickness of the middle insulating layer is 2.8mm, and the thickness of the thinnest part is not less than 2.52 mm; the outer insulating layer is made of strippable cross-linked semiconductive insulating shielding materials, and the minimum thickness of the outer insulating layer is 0.30 mm; the outer sheath is made of polyethylene sheath material, polyvinyl chloride thermoplastic sheath material or cross-linked chloroprene rubber sheath material, the thinnest part of the outer sheath is 1.40mm, and the thickness range of the outer sheath is 1.40 mm-1.80 mm.
Description
Technical Field
The utility model relates to an airport aid to navigation light circuit is with burying ground cable belongs to wire and cable technical field, is used for guaranteeing airport runway to use the electricity steadily for a long time, provides reliable illuminating effect's series connection major loop with burying ground cable for the aircraft.
Background
The airport navigation aid light cable is used for power transmission of a light navigation system for a civil airport, and the stability of the cable directly influences the safety of taking off and landing of flights. With the rapid development of world economy, flights are more and more, and flights take off and land more and more frequently, higher requirements are provided for the stability and the service life of an airport navigation light optical cable. In addition, with the expansion of airport construction areas, the environments of all airports are inconsistent from northern frontier to southern coastal areas, and the requirements for cables are different.
Disclosure of Invention
The utility model aims at providing an electrical property is good, can satisfy various environmental requirements, guarantees that airport runway uses electricity steadily for a long time, can provide reliable illuminating effect's an airport aid to navigation lamp with burying cable for the aircraft.
The technical scheme of the utility model is that: the inner insulating layer, the middle insulating layer and the outer insulating layer are extruded on the conductor in a production mode of three-layer co-extrusion, dry crosslinking and continuous vulcanization. The conductor and the three insulating layers form an insulating wire core. And a shielding layer is coated outside the insulated wire core. And an outer sheath is coated outside the shielding layer. Specifically, the method comprises the following steps:
the utility model provides an airport aid to navigation light circuit is with burying ground cable which characterized in that: the outer diameter of the whole cable is not more than 15.90 mm; the cable structurally comprises a conductor, an inner insulating layer, a middle insulating layer, an outer insulating layer, a shielding layer and an outer sheath, wherein the inner insulating layer, the middle insulating layer, the outer insulating layer, the shielding layer and the outer sheath are wrapped outside the conductor from inside to outside;
the cross-sectional area of the conductor is 6mm2；
The inner insulating layer is made of a semiconductive shielding material, and the minimum thickness of the inner insulating layer is 0.15 mm;
the middle insulating layer is made of a cross-linked polyethylene material or a waterproof tree cross-linked polyethylene material or an ethylene propylene rubber material, the nominal thickness of the middle insulating layer is 2.8mm, and the thickness of the thinnest part is not less than 2.52 mm;
the outer insulating layer is made of strippable cross-linked semiconductive insulating shielding materials, and the minimum thickness of the outer insulating layer is 0.30 mm;
the outer sheath is made of polyethylene sheath material, polyvinyl chloride thermoplastic sheath material or cross-linked chloroprene rubber sheath material, the thinnest part of the outer sheath is 1.40mm, and the thickness range of the outer sheath is 1.40 mm-1.80 mm.
The improvement is as follows: the conductor is formed by twisting 7 copper monofilaments with the diameter of 1.04mm, the shielding layer is a copper strip shielding layer, the copper strip shielding layer is formed by overlapping and wrapping copper strips, the minimum covering rate of the wrapping is not lower than 15%, and the minimum thickness of the copper strips is 0.07 mm; the middle insulating layer is made of cross-linked polyethylene material or waterproof tree cross-linked polyethylene material or ethylene propylene rubber material; the outer sheath is made of polyethylene sheath material, polyvinyl chloride thermoplastic sheath material or cross-linked chloroprene rubber sheath material, and the thickness range of the outer sheath is 1.40 mm-1.80 mm.
The cable with the improved structure is suitable for the 5kV power transmission requirement.
The second improvement is that: the conductor is formed by stranding soft-structure tinned copper wires, the number of the tinned copper wires is 19, and the diameter of each tinned copper wire is 0.64 mm; the shielding layer is a copper mesh braided metal shielding layer, the minimum braided density is not less than 90%, and the diameter of a copper wire for braiding is not less than 0.15 mm; the middle insulating layer is made of ethylene propylene rubber material; the outer sheath is made of polyvinyl chloride thermoplastic sheath material or cross-linked chloroprene rubber sheath material.
This improve cable of structure makes the bending property of cable excellent, can guarantee the installation and the use in narrow and small space, can use under multiple space environmental requirement.
The utility model is suitable for an airport aid to navigation light circuit is with burying ground cable, it can require to choose for use different insulation, sheath material according to different service environment, service property. The insulation production adopts the production modes of three-layer co-extrusion, dry crosslinking and continuous vulcanization to produce the insulated wire core at one time, thereby ensuring that no impurities are brought into the insulated wire core during production. The shielding layer can limit the electric field in the insulation, prevent the axial surface discharge and has the function of magnetic shielding. Therefore, the cable for the airport runway can be effectively ensured to stably run for a long time, and has small outer diameter and light weight.
Through improvement, the bending radius of the cable is smaller and softer, the size of the junction box can be greatly reduced, and enough length allowance can be reserved. Adopt high density copper mesh to weave the shielding layer and can also further guarantee the higher compliance of cable, reduce bend radius, guarantee the installation and the use in narrow and small space, satisfy the operation requirement under the multiple space environment requirement.
The cable has good electrical performance, can ensure stable long-time electricity utilization of the airport runway and ensure the reliable lighting effect required by the airplane.
Drawings
FIG. 1 is a schematic cross-sectional view of embodiments 1 to 3;
FIG. 2 is a schematic sectional structure in examples 4 and 5;
in the figure: 1. the cable comprises a conductor, 2, an inner insulating layer, 3, a middle insulating layer, 4, an outer insulating layer, 5, an insulating wire core, 6, a copper strip metal shielding layer, 7 and an outer sheath.
Detailed Description
The technical scheme is further explained by combining the drawings and the detailed implementation mode as follows:
a kind of airport aid to navigation light circuit uses the buried cable, the whole cable external diameter is no more than 15.90 mm; the cable structurally comprises a conductor, an inner insulating layer, a middle insulating layer, an outer insulating layer, a shielding layer and an outer sheath, wherein the inner insulating layer, the middle insulating layer, the outer insulating layer, the shielding layer and the outer sheath are wrapped outside the conductor from inside to outside; the cross-sectional area of the conductor is 6mm2(ii) a The inner insulating layer is made of a semiconductive shielding material, and the minimum thickness of the inner insulating layer is 0.15 mm; the middle insulating layer is made of a cross-linked polyethylene material or a waterproof tree cross-linked polyethylene material or an ethylene propylene rubber material, the nominal thickness of the middle insulating layer is 2.8mm, and the thickness of the thinnest part is not less than 2.52 mm; the outer insulating layer is made of strippable cross-linked semiconductive insulating shielding materials, and the minimum thickness of the outer insulating layer is 0.30 mm; the outer sheath is made of polyethylene sheath material or polyvinyl chloride thermoplastic sheath material or cross-linked chloroprene rubber sheath materialThe thinnest part of the sleeve is 1.40mm in thickness.
As in fig. 1, for 5kV usage requirements: the conductor is formed by twisting 7 copper monofilaments with the diameter of 1.04mm, the shielding layer is a copper strip shielding layer, the copper strip shielding layer is formed by overlapping and wrapping copper strips, the minimum covering rate of the wrapping is not lower than 15%, and the minimum thickness of the copper strips is 0.07 mm; the middle insulating layer is made of cross-linked polyethylene material or waterproof tree cross-linked polyethylene material or ethylene propylene rubber material; the outer sheath is made of polyethylene sheath material or polyvinyl chloride thermoplastic sheath material or cross-linked chloroprene rubber sheath material.
Examples 1 to 3 are suitable for 5kV application requirements.
Example 1, an inner insulating layer, a middle insulating layer and an outer insulating layer are extruded on a conductor in a three-layer co-extrusion mode, the conductor and the three insulating layers form an insulating wire core, a copper strip shielding layer is wrapped around the insulating wire core, and an outer sheath is extruded around the copper strip shielding layer. The conductor adopts a metric wire gauge and is formed by twisting 7 copper wires with the diameter of 1.04 mm. The inner insulating layer is made of a semiconductive shielding material, the average thickness of the inner insulating layer is 0.18mm, and the minimum thickness of the inner insulating layer is 0.15 mm. The middle insulating layer is made of cross-linked polyethylene (XLPE) insulating material. The nominal thickness of the middle insulating layer is 2.8mm, the thickness of the thinnest part is not less than 2.52mm, and the difference between the measured value of the maximum thickness and the measured value of the minimum thickness is not more than 0.4 mm. The outer insulating layer is made of a semiconductive insulating shielding material, the average thickness of the outer insulating layer is 0.35mm, and the minimum thickness of the outer insulating layer is 0.30 mm. The copper strip shielding layer adopts a single-layer overlapping wrapping structure, and the thickness of the thinnest part of the copper strip is 0.07 mm. The outer sheath is made of polyethylene, the thinnest part of the outer sheath layer is 1.40mm, and the thickness range is 1.40 mm-1.80 mm.
Example 2: the conductor is extruded with an inner insulating layer, a middle insulating layer and an outer insulating layer in a three-layer co-extrusion mode, the conductor and the three insulating layers form an insulating wire core, a copper strip shielding layer is wrapped around the periphery of the insulating wire core, and an outer sheath is extruded around the periphery of the copper strip shielding layer. The middle insulating layer is made of waterproof tree cross-linked polyethylene (TR-XLPE) insulating material. The nominal thickness of the middle insulating layer is 2.8mm, and the thickness of the thinnest part is not less than 2.52 mm. The outer sheath is made of polyvinyl chloride thermoplastic sheath, the thinnest part of the outer sheath layer is 1.40mm, and the thickness range is 1.40 mm-1.80 mm.
Other structures, materials and thicknesses of this embodiment are the same as those of embodiment 1.
Example 3: the conductor is extruded with an inner insulating layer, a middle insulating layer and an outer insulating layer in a three-layer co-extrusion mode, the conductor and the three insulating layers form an insulating wire core, a copper strip shielding layer is wrapped around the periphery of the insulating wire core, and an outer sheath is extruded around the periphery of the copper strip shielding layer. The nominal thickness of the middle insulating layer is 2.8mm, and the thickness of the thinnest part is not less than 2.52 mm. The outer sheath is a cross-linked chloroprene rubber sheath, and the thickness range of the outer sheath layer is 1.40 mm-1.80 mm.
Other structures, materials and thicknesses of this embodiment are the same as those of embodiment 1.
Through detection, the main performance parameters of the cables of examples 1 to 3 are as follows:
(1) conductor direct current resistance test: at 20 ℃, the temperature is less than or equal to 3.08 omega/km.
(2) Partial discharge test: at a test voltage of 9kV, there should be no detectable discharge produced by the cable that exceeds the sensitivity of the claimed test. (the assay sensitivity should be 5pC or better).
(3) Alternating voltage test-a test voltage is applied between the conductor and the metal shield. From the start of voltage application, the voltage is increased to a specified voltage, and the voltage is uniformly increased and does not exceed 1.8kV within 10s, and is increased to 18kV within 60 s. The test voltage duration is 5min, and the insulation should not have a breakdown phenomenon.
(4) And (3) low-temperature bending test of the finished cable: and (3) extracting a finished cable sample with the diameter not less than 0.5m, putting the finished cable sample into a freezing box with the temperature of minus 25 +/-2 ℃, taking out the sample after 1h, immediately winding the sample at a constant speed for 180 degrees along a cylinder with the diameter 8 times of the outer diameter of the cable, and taking out the sample from the freezing box until the test is finished for not more than 1 min. After the test, the cable surface should be crack-free.
(5) The minimum bend radius allowed for cable operation is 12 times the cable diameter.
The use requirements for flexibility are high:
as shown in fig. 2, the conductor is formed by stranding soft-structure tinned copper wires, the number of the tinned copper wires is 19, and the diameter of the tinned copper wires is 0.64 mm; the shielding layer is a copper mesh braided metal shielding layer, the minimum braided density is not less than 90%, and the diameter of a copper wire for braiding is not less than 0.15 mm; the middle insulating layer is made of ethylene propylene rubber material; the outer sheath is made of polyvinyl chloride thermoplastic sheath material or cross-linked chloroprene rubber sheath material.
Examples 4 to 5 are suitable for use in which flexibility is required to be high.
Example 4 the conductor is a flexible conductor, 6mm2The conductor adopts a metric wire gauge, and the soft conductor is formed by twisting 19 tinned fine copper wires with the monofilament diameter of 0.64 mm. The inner insulating layer is made of a semiconductive shielding material, the average thickness of the inner insulating layer is 0.18mm, and the minimum thickness of the inner insulating layer is 0.15 mm. The middle insulating layer is made of Ethylene Propylene Rubber (EPR) insulating material. The nominal thickness of the middle insulating layer is 2.8mm, the thickness of the thinnest part is not less than 2.52mm, and the difference between the measured value of the maximum thickness and the measured value of the minimum thickness is not more than 0.4 mm. The outer insulating layer is made of a semiconductive insulating shielding material, the average thickness of the outer insulating layer is 0.35mm, and the minimum thickness of the outer insulating layer is 0.30 mm. The shielding layer is a copper mesh woven metal shielding layer, the monofilament diameter of the copper mesh is 0.15mm, and the weaving density is not less than 90%. The outer sheath is made of polyvinyl chloride thermoplastic sheath, the thickness range of the outer sheath layer is 1.40 mm-1.80 mm, and the outer diameter of the whole cable is not more than 15.90 mm.
Example 5: an inner insulating layer, a middle insulating layer and an outer insulating layer are extruded on the conductor in a three-layer co-extrusion mode. The conductor and the three insulating layers form an insulating wire core. And the periphery of the insulated wire core is braided and shielded by adopting a copper mesh. And an outer sheath is extruded at the periphery of the shielding layer. The nominal thickness of the middle insulating layer made of Ethylene Propylene Rubber (EPR) insulating materials is 2.8mm, and the thickness of the thinnest part is not less than 2.52 mm. The outer sheath is a cross-linked chloroprene rubber sheath, the thickness range of the outer sheath layer is 1.40 mm-1.80 mm, and the outer diameter of the whole cable is not more than 15.90 mm. Other structures, materials and thicknesses of this embodiment are the same as those of embodiment 1.
Through detection, the main performance parameters of the cables of examples 4 to 5 are as follows:
(1) conductor direct current resistance test: at 20 ℃, the temperature is less than or equal to 3.08 omega/km.
(2) Partial discharge test: at a test voltage of 9kV, there should be no detectable discharge produced by the cable that exceeds the sensitivity of the claimed test. (the assay sensitivity should be 5pC or better).
(3) Alternating voltage test-a test voltage is applied between the conductor and the metal shield. From the start of voltage application, the voltage is increased to a specified voltage, and the voltage is uniformly increased and does not exceed 1.8kV within 10s, and is increased to 18kV within 60 s. The test voltage duration is 5min, and the insulation should not have a breakdown phenomenon.
(4) And (3) low-temperature bending test of the finished cable: and (3) extracting a finished cable sample with the diameter not less than 0.5m, putting the finished cable sample into a freezing box with the temperature of minus 25 +/-2 ℃, taking out the sample after 1h, immediately winding the sample at a constant speed for 180 degrees along a cylinder with the diameter 6 times of the outer diameter of the cable, and taking out the sample from the freezing box until the test is finished for not more than 1 min. After the test, the cable surface should be crack-free.
(5) The minimum bend radius allowed for cable operation is 6 times the cable diameter.
Claims (3)
1. The utility model provides an airport aid to navigation light circuit is with burying ground cable which characterized in that: the outer diameter of the whole cable is not more than 15.90 mm; the cable structurally comprises a conductor, an inner insulating layer, a middle insulating layer, an outer insulating layer, a shielding layer and an outer sheath, wherein the inner insulating layer, the middle insulating layer, the outer insulating layer, the shielding layer and the outer sheath are wrapped outside the conductor from inside to outside;
the cross-sectional area of the conductor is 6mm2；
The inner insulating layer is made of a semiconductive shielding material, the average thickness of the inner insulating layer is 0.18mm, and the minimum thickness of the inner insulating layer is 0.15 mm;
the middle insulating layer is made of a cross-linked polyethylene material or a waterproof tree cross-linked polyethylene material or an ethylene propylene rubber material, the nominal thickness of the middle insulating layer is 2.8mm, and the thickness of the thinnest part is not less than 2.52 mm;
the outer insulating layer is made of strippable cross-linked semiconductive insulating shielding materials, and the minimum thickness of the outer insulating layer is 0.30 mm;
the outer sheath is made of polyethylene sheath material, polyvinyl chloride thermoplastic sheath material or cross-linked chloroprene rubber sheath material, the thinnest part of the outer sheath is 1.40mm, and the thickness range of the outer sheath is 1.40 mm-1.80 mm.
2. The buried cable for an airport navigational light circuit of claim 1, wherein: the conductor is formed by stranding 7 copper monofilaments with the diameter of 1.04mm, the shielding layer is a copper strip shielding layer, the copper strip shielding layer is formed by overlapping and wrapping copper strips, the minimum covering rate of the wrapping is not lower than 15%, and the minimum thickness of the copper strips is 0.07 mm.
3. The buried cable for an airport navigational light circuit of claim 1, wherein: the conductor is formed by stranding soft-structure tinned copper wires, the number of the tinned copper wires is 19, and the diameter of each tinned copper wire is 0.64 mm; the shielding layer is a copper mesh braided metal shielding layer, the minimum braided density is not less than 90%, and the diameter of a copper wire for braiding is not less than 0.15 mm; the middle insulating layer is made of ethylene propylene rubber material; the outer sheath is made of polyvinyl chloride thermoplastic sheath material or cross-linked chloroprene rubber sheath material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022603802.5U CN214336364U (en) | 2020-11-12 | 2020-11-12 | Underground cable for airport navigation light circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022603802.5U CN214336364U (en) | 2020-11-12 | 2020-11-12 | Underground cable for airport navigation light circuit |
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| Publication Number | Publication Date |
|---|---|
| CN214336364U true CN214336364U (en) | 2021-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022603802.5U Active CN214336364U (en) | 2020-11-12 | 2020-11-12 | Underground cable for airport navigation light circuit |
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|---|---|
| CN (1) | CN214336364U (en) |
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- 2020-11-12 CN CN202022603802.5U patent/CN214336364U/en active Active
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