Novel 5KV airport navigation-aid light fireproof cable

Abstract

A novel 5KV airport navigational light fireproof cable comprises a copper conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a copper strip shielding layer, a silica gel strip layer, an aluminum protection layer, a fireproof layer and a combustion-supporting sheath which are sequentially arranged from inside to outside. The fireproof and flame-retardant performance of the cable is higher than the existing standard.

Description

Technical Field

[0001] The utility model relates to a novel 5KV fireproof cable for airport navigation lights. Background Art

[0002] At present, the buried cable for airport navigation lighting circuit implements the unified standard MH / T 6049-2008 issued by the Civil Aviation Administration of China on November 24, 2008. Its cable structure is 1. conductor, 2. conductor shield, 3. cross-linked polyethylene insulation, 4. insulation shield, 5. copper tape shield, 6. polyethylene sheath. However, since modern airports are located in the special location of the city and there are dense working and residential areas nearby, the reliable operation of airport navigation lighting cables is an important condition to ensure the safe take-off and landing of aircraft in all weather conditions. Airport navigation lighting cables themselves should have special properties, which determines that the fire protection of airport navigation lighting cables cannot be ignored. Therefore, it is very necessary that airport navigation lighting cables used in these areas must have fire protection functions. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a novel 5KV fireproof cable for airport navigation lights, whose fireproof and flame-retardant performance is higher than the existing standard.

[0004] In order to solve the above problems, the technical solution of the utility model is:

[0005] A new type of 5KV airport navigation lighting fireproof cable includes a copper conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a copper tape shielding layer, a silicone tape layer, an aluminum sheath, a fireproof layer and a combustion-supporting sheath which are arranged in sequence from the inside to the outside.

[0006] Preferably, the copper conductor is formed by twisting a plurality of annealed copper monofilaments.

[0007] Preferably, the insulating layer is made of XLPE insulating material.

[0008] Preferably, the silicone tape layer comprises a ceramic silicone tape wrapped around a copper tape shielding layer.

[0009] Preferably, the aluminum sheath is a corrugated aluminum sheath.

[0010] Preferably, the fireproof layer is extruded fireproof mud.

[0011] Preferably, the combustion-supporting sheath is low-smoke halogen-free flame-retardant polyolefin.

[0012] The beneficial effects of the utility model are as follows: compared with the existing standard cables, the cable has a novel structure, excellent electrical and physical properties, and excellent fireproof, waterproof and other protective properties, meeting the requirements for safe and reliable operation of navigation light cables in the special environment of airports. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings:

[0014] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0015] Figure 2 This is a process flow chart of the utility model.

[0016] In the figure: copper conductor 1, conductor shielding layer 2, insulation layer 3, insulation shielding layer 4, copper tape shielding layer 5, silicone tape layer 6, aluminum sheath 7, fireproof layer 8, combustion-supporting sheath 9 DETAILED DESCRIPTION

[0017] A novel 5KV airport navigation lighting fireproof cable comprises a copper conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a copper tape shielding layer 5, a silicone tape layer 6, an aluminum sheath 7, a fireproof layer 8 and a combustion-supporting sheath 9 which are arranged in sequence from the inside to the outside.

[0018] Preferably, the copper conductor 1 is composed of bare annealed copper wire in accordance with GB / T3956 (copper purity ≥ 99.95%). In the manufacturing process of the cable copper conductor 1, oxygen-free copper rods are first manufactured by an imported up-drawing production line, and monofilaments are drawn by an imported small drawing machine for continuous annealing.

[0019] The copper conductor 1 is twisted with 7 strands of 1.04mm single wires, which are pressed and formed at one time to ensure the tightness and structural stability of the copper conductor 1. The surface of the copper conductor 1 is smooth, free of oil stains, burrs and sharp edges that damage the shielding and insulation, and there are no protrusions or broken single wires. The nominal cross-section of the cable copper conductor 1 is 6mm 2 , the DC resistance of copper conductor 1 at 20℃ is ≤3.08Ω / km.

[0020] Preferably, the insulating layer 3 is made of XLPE insulating material, the nominal insulation thickness is 2.8 mm, the average insulation thickness should not be less than the nominal value, the minimum measured thickness at any point should not be less than 2.52 mm, and the maximum measured thickness should not be greater than 3.0 mm.

[0021] Preferably, the insulating shielding layer 4 is an extruded cross-linked semi-conductive layer, which is evenly coated on the insulating surface. The surface should be smooth, without sharp corners, particles, burns or scratches. The resistivity of the insulating shielding layer 4 is not greater than 500 ohm meters. The nominal thickness of the insulating shield is 0.6 mm, and the minimum thickness should be not less than 0.48 mm. The material is strippable.

[0022] Preferably, the copper tape shielding layer 5 is a layer of copper tape wound outside the insulating shielding layer 4. The thickness of the copper tape is 0.08 mm, the thickness at the thinnest part should be no less than 0.07 mm, and the minimum overlap rate between the copper tapes should be no less than 15%.

[0023] Preferably, the silicone tape layer 6 includes a ceramic silicone tape wrapped around the copper tape shielding layer 5, with a thickness of 0.2 mm, and the minimum overlap rate of the wrapping should be no less than 45%. This structure can block oxygen and act as a heat-insulating and cooling layer when a fire occurs, thereby ensuring the safe operation of the insulated wire core.

[0024] Preferably, the aluminum sheath 7 is a corrugated aluminum sheath, which is longitudinally wrapped with an aluminum strip having a thickness of 0.8 mm, and argon arc welding is adopted. After longitudinally wrapping with argon arc welding, corrugation is performed. The weld is required to be sealed and flat, and the inner wall of the corrugation is close to the inner layer of the cable. The corrugation depth is controlled at about 0.5 mm, and the pitch is controlled at 8 to 12 mm. This structure can not only block the fire layer and isolate oxygen, but also achieve a completely sealed shielding effect for the entire cable.

[0025] Preferably, the fireproof layer 8 is extruded fireproof mud, which is 1.0 mm magnesium hydroxide, which has good fireproof and fire-resistant properties. Magnesium hydroxide and glass glue are mixed evenly in a ratio of 65:35, added to the extruder for extrusion, and the appearance after extrusion should be smooth, dense, and round. A layer of high-resistance tape is wrapped around the core, and the minimum overlap rate of the wrapping should be no less than 15%. The fireproof mud can ensure that when a fire occurs, the cable can work normally within the specified 90 minutes through the fireproof layer 8, thereby achieving the purpose of fire prevention.

[0026] Preferably, the combustion-supporting sheath 9 is low-smoke halogen-free flame-retardant polyolefin, and the nominal thickness of the sheath is 1.4 mm. The average thickness of the sheath should not be less than the nominal value, and the minimum thickness at any point should not be less than 85% of the nominal value. The appearance of the outer sheath should be round, smooth, and undamaged. The low-smoke halogen-free flame-retardant polyolefin can release a large amount of water under high temperature conditions, and the evaporation of water will absorb a large amount of heat. At the same time, it has a flame retardant effect, and combustion does not produce toxic and harmful substances, which is not likely to cause harm to the human body.

[0027] After testing the cable, the results show that the cable has excellent performance indicators and meets the design requirements.

[0028] 1 Cable electrical performance test, test results are shown in Table 1

[0029] Table 1 Test results of product performance

[0030]

[0031] 2 Low smoke and halogen-free characteristics are in accordance with GB / T19666-2019. The test results of low smoke and halogen-free performance test are shown in Table 2.

[0032] Table 2 Cable low smoke zero halogen performance test results

[0033] Test items unit Standard requirements Test results in conclusion Minimum light transmittance ％ 60 75 qualified Maximum conductivity μs / mm 10 4 qualified pH minimum / 4.3 6.5 qualified Halogen acid gas release is the largest mg / g 5 0 qualified

[0034] 3 The cable fire resistance test is in accordance with BS 6387:1994. The test results are shown in Table 3.

[0035] Table 3 Cable fire performance test results

[0036]

[0037] After testing, the fire resistance performance meets the requirements of BS 6387:1994.

[0038] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A new type of 5KV airport navigation lighting fireproof cable, characterized by: The invention comprises a copper conductor (1), a conductor shielding layer (2), an insulating layer (3), an insulating shielding layer (4), a copper tape shielding layer (5), a silicone tape layer (6), an aluminum sheath (7), a fireproof layer (8) and a combustion-supporting sheath (9) which are arranged in sequence from the inside to the outside.

2. According to claim 1, a new type of 5KV airport navigation lighting fireproof cable is characterized by: The copper conductor (1) is formed by twisting a plurality of annealed copper monofilaments.

3. According to claim 1, a new type of 5KV airport navigation lighting fireproof cable is characterized by: The insulating layer (3) is made of XLPE insulating material.

4. A new type of 5KV airport navigation lighting fireproof cable according to claim 1, characterized in that: The silicone tape layer (6) comprises a ceramic silicone tape wrapped around the copper tape shielding layer (5).

5. A new type of 5KV airport navigation lighting fireproof cable according to claim 1, characterized in that: The aluminum protective layer (7) is a corrugated aluminum sheath.

6. A new type of 5KV airport navigation lighting fireproof cable according to claim 1, characterized in that: The fireproof layer (8) is extruded fireproof mud.

7. A new type of 5KV airport navigation lighting fireproof cable according to claim 1, characterized in that: The combustion-supporting sheath (9) is low-smoke, halogen-free, flame-retardant polyolefin.

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