Fire-resistant and radiation-resistant communication cable for nuclear power station

Abstract

The utility model discloses a fireproof radiation-proof communication cable for a nuclear power station, which comprises a conductor, an inner insulating layer, an outer insulating layer, a first mica tape, a first shielding layer, a first lining layer, a filling rope, a second mica tape, a total shielding layer, a second lining layer and an outer sheath, the conductor is wrapped by the inner insulating layer, and the inner insulating layer is wrapped by the outer insulating layer. The conductor, the inner insulating layer and the outer insulating layer form an insulating wire core, a plurality of insulating wire cores are stranded to form a stranded wire core, the first mica tape wraps the stranded wire core, the first shielding layer is arranged on the first mica tape, and the first lining layer wraps the first shielding layer to form a stranded wire core assembly. A plurality of stranded wire core assemblies are matched with a plurality of filling ropes to form a cable core, a second mica tape wraps the cable core, a total shielding layer wraps the second mica tape, a second lining layer wraps the total shielding layer, and an outer sheath wraps the second lining layer. The communication cable provided by the utility model is not only radiation-proof, but also excellent in fire resistance.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable manufacturing technical field, especially in nuclear power plant with fire -resistant radiation -resistant communication cable. BACKGROUND

[0002] Cable is the product of transmission electric energy, electric signal and realization electromagnetic energy conversion. Usually, cable is composed of cable core, wrapping layer, shielding layer and outer sheath, wrapping layer is wrapped on cable core, shielding layer generally forms the package to wrapping layer through the way of braiding, and outer sheath forms the package to shielding layer through extrusion.

[0003] Cable core is usually composed of one or more wire cores, wire core is composed of conductor and insulating layer of conductor, and insulating layer usually forms the package to conductor through the way of extrusion. Wire core is the key component of conduction or transmission electric signal, and the quality of wire core plays a decisive role in the high and low of cable quality.

[0004] Ordinary low smoke halogen-free flame-retardant cable has low temperature resistance grade, small overload capacity, small insulation resistance, poor anti-aging performance, poor environmental protection performance and short service life, and can not meet the use in special occasions. SUMMARY

[0005] The utility model provides a nuclear power plant with fire -resistant radiation -resistant communication cable, the communication cable of the utility model is both radiation -resistant and has excellent fire -resistant.

[0006] Nuclear power plant with fire -resistant radiation -resistant communication cable, including conductor, inner insulating layer, outer insulating layer, first mica tape, first shielding layer, first inner lining, filling rope, second mica tape, total shielding layer, second inner lining, outer sheath, inner insulating layer is wrapped conductor, outer insulating layer is wrapped inner insulating layer, and conductor, inner insulating layer, outer insulating layer form insulating wire core, and multiple insulating wire cores are twisted and formed into twisted wire core, and first mica tape is wrapped on twisted wire core, and first shielding layer is arranged on first mica tape, and first inner lining forms twisted wire core assembly after wrapping first shielding layer, and multiple twisted wire core assemblies and multiple filling ropes cooperate and form cable core, and second mica tape is wrapped cable core, and total shielding layer is wrapped on second mica tape, and second inner lining is wrapped total shielding, and outer sheath is wrapped second inner lining.

[0007] Further, the total thickness of the inner insulating layer and the outer insulating layer is less than or equal to 0.7 mm.

[0008] Further, the material of the first shielding layer is a copper plastic tape.

[0009] Further, the material of the filling rope is a glass fiber yarn.

[0010] Further, the total shielding layer is composed of a leakage wire and a second shielding layer, the material of the second shielding layer is a copper plastic tape, and the second shielding layer is wrapped around the second mica tape.

[0011] Further, the material of the first inner lining layer and the second inner lining layer is halogen-free low-smoke flame-retardant oxygen barrier material.

[0012] In the utility model, since the material of the first inner lining layer and the second inner lining layer is halogen-free low-smoke flame-retardant oxygen barrier material, it has good extrusion performance, high flame retardancy, good burning shell property, good processing performance, physical mechanical property, insulation performance and excellent flame retardant characteristics, and can be self-extinguished when away from fire, can greatly reduce the emission of toxic corrosive gas and the generation of smoke, and has high safety and reliability after being made into a cable. The glass fiber yarn used in the filling rope makes the cable have excellent fire resistance. The cable adopts a total and partial shielding structure, and uses copper plastic composite tape as the material, so that it has excellent anti-radiation performance. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural diagram of the fire-resistant and radiation-resistant communication cable for nuclear power plants in the utility model.

[0014] Markings in the drawings:

[0015] Conductor 1, inner insulation layer 2, outer insulation layer 3, first mica tape 4, first shielding layer 5, first inner lining layer 6, filling rope 7, second mica tape 8, leakage line 9, second shielding layer 10, second inner lining layer 11, outer sheath 12. DETAILED DESCRIPTION

[0016] As Figure 1 The fire-resistant and radiation-resistant communication cable for nuclear power plants comprises a conductor 1, an inner insulation layer 2, an outer insulation layer 3, a first mica tape 4, a first shielding layer 5, a first inner lining layer 6, a filling rope 7, a second mica tape 8, a total shielding layer, a second inner lining layer 11 and an outer sheath 12.

[0017] In the embodiment, the conductor 1 is a stranded annealed copper wire, and the nominal diameter is not less than 7 / 0.2 mm. The nominal value of the inner insulation layer 2 is 0.30 mm, and the thinnest part is 0.25 mm. The nominal value of the outer insulation layer 3 is 0.40 mm, and the thinnest part is 0.35 mm. The total thickness of the inner insulation layer 2 and the outer insulation layer 3 is less than or equal to 0.7 mm.

[0018] The inner insulation layer 2 and the outer insulation layer 3 are both formed by extrusion molding, wherein the temperature of the raw material forming the inner insulation layer 2 in each section of the extrusion die is: 330℃ (first temperature zone), 330℃ (second temperature zone), 235℃ (third temperature zone), 215℃ (fourth temperature zone), and 180℃ (fifth temperature zone). The temperature of the raw material forming the outer insulation layer 3 in each section of the extrusion die is: 330℃ (first temperature zone), 330℃ (second temperature zone), 235℃ (third temperature zone), 215℃ (fourth temperature zone), and 180℃ (fifth temperature zone).

[0019] The conductor 1, the inner insulation layer 2, and the outer insulation layer 3 form an insulated wire core, a plurality of insulated wire cores are twisted to form a twisted wire core, the first mica tape 4 is wrapped around the twisted wire core, the wrapping coverage rate of the mica layer 4 towards the inside should be no less than 35%, and the twist pitch ratio of the star twisted group is ≤10 times.

[0020] The first inner lining layer 6 is wrapped around the first shielding layer 5 to form a twisted wire core assembly, the material of the first inner lining layer 6 is halogen-free low-smoke flame-retardant oxygen barrier material, the nominal value of the first inner lining layer 6 is 0.6mm, the thinnest part is 0.44mm, the halogen-free low-smoke flame-retardant oxygen barrier material has good processing performance, physical and mechanical properties, insulation performance, and excellent flame-retardant characteristics, and can self-extinguish when away from fire, can greatly reduce the emission of toxic and corrosive gases and the generation of smoke, and has high safety and reliability after being made into a cable.

[0021] A plurality of twisted wire core assemblies are combined with a plurality of filling ropes 7 to form a cable core, the material of the filling rope 7 is glass fiber yarn. The second mica tape 8 is wrapped around the cable core, the second mica tape 8 not only plays a fixing role on the cable core, but also in this embodiment, the mica surface is towards the inside, the wrapping coverage rate should be no less than 25%, and the cable pitch ratio is 16-20 times. The glass fiber in the glass fiber yarn has high temperature resistance, is non-combustible, anti-corrosion, good in heat and sound insulation, high in tensile strength, and good in electrical insulation, especially, it can be melted into glass-like small beads at high temperature.

[0022] The total shielding layer is wrapped around the second mica tape 8, and the total shielding is composed of a leakage wire 9 and a second shielding layer 10, the material of the second shielding layer 10 is copper plastic tape, and the second shielding layer 10 is wrapped around the second mica tape 8. The second inner lining layer 11 wraps the total shielding, the material of the second inner lining layer 11 is halogen-free low-smoke flame-retardant oxygen barrier material, the nominal value of the second inner lining layer 11 is 0.6mm, the thinnest part is 0.44mm, the halogen-free low-smoke flame-retardant oxygen barrier material has good processing performance, physical and mechanical properties, insulation performance, and excellent flame-retardant characteristics, and can self-extinguish when away from fire, can greatly reduce the emission of toxic and corrosive gases and the generation of smoke, and has high safety and reliability after being made into a cable.

[0023] The outer sheath 12 wraps around the second inner liner 11. The outer sheath 12 is made of thermosetting, low-smoke, halogen-free, flame-retardant polyolefin. When extruding the outer sheath 12, the temperature requirements for each section of the extrusion die are: 95℃ (feed inlet temperature), 120℃ (first melting section temperature), 130℃ (second melting section temperature), 140℃ (third melting section temperature), 150℃ (neck temperature), 160℃ (die head temperature), and 160℃ (die opening temperature).

[0024] According to the requirements of GB / T 19216.21 / IEC60331-21, based on the above structure, this utility model can withstand direct flame combustion at up to 830℃ for 180 minutes and can withstand 90 V•DC without breakdown.

[0025] The preparation process of this utility model is as follows:

[0026] S1, conductor 1 is formed by stranded and annealed copper wire.

[0027] S2, the materials of the inner insulating layer 2 and the outer insulating layer 3 are extruded onto the conductor 1 in a double-layer co-extrusion manner to form an insulating layer, wherein:

[0028] The temperatures of the raw material forming the inner insulation layer 2 in each section of the extrusion die are: 330℃ (first temperature zone), 330℃ (second temperature zone), 235℃ (third temperature zone), 215℃ (fourth temperature zone), and 180℃ (fifth temperature zone).

[0029] The temperatures of the raw material forming the outer insulation layer 3 in each section of the extrusion die are: 330℃ (first temperature zone), 330℃ (second temperature zone), 235℃ (third temperature zone), 215℃ (fourth temperature zone), and 180℃ (fifth temperature zone).

[0030] S3, the first mica tape 4 is used to wrap the outer insulation layer 3, and the first shielding layer 5 is wrapped on the first mica tape 4 to form a sub-shielding. When wrapping, the mica layer faces inward and the copper surface faces inward. The wrapping overlap rate should not be less than 35%, and the twist pitch ratio of the star strand group should be ≤10 times.

[0031] S4, the halogen-free, low-smoke, flame-retardant, and oxygen-barrier material is wrapped around the first shielding layer 5 by extrusion to form the first inner liner layer 6. The temperature of the raw material forming the first inner liner layer 6 in each section of the extrusion die is: 135℃ (feed inlet temperature), 140℃ (first melting section temperature), 145℃ (second melting section temperature), 150℃ (third melting section temperature), 155℃ (fourth melting section temperature), 160℃ (die neck temperature), 160℃ (die head temperature), and 160℃ (die opening temperature).

[0032] S5, since the first inner lining layer 6 wraps the first shielding layer 5 to form a stranded core assembly, four stranded core assemblies are used in cooperation with the filling rope 7 to form a cable core, and the filling rope 7 uses 6mm glass fiber yarn.

[0033] S6, the second mica tape 8 is wrapped around the cable core, and the wrapping coverage should be no less than 25%, and the cabling pitch ratio is 16-20 times.

[0034] S7, the leakage line 9 and the second shielding layer 10 are used to form the total shielding and are wrapped on the second mica tape 8.

[0035] S8, the halogen-free low-smoke flame-retardant oxygen barrier material is wrapped on the total shielding in the form of extrusion to form the second inner lining layer 11, and the temperature of the raw material for forming the second inner lining layer 11 in the extrusion die is: 135℃ (feed port temperature), 140℃ (first melting section temperature), 145℃ (second melting section temperature), 150℃ (third melting section temperature), 155℃ (fourth melting section temperature), 160℃ (machine neck temperature), 160℃ (machine head temperature), 160℃ (die temperature).

[0036] S9, the raw material for forming the outer sheath 12 is wrapped around the second inner lining layer 11 in the form of extrusion, and when the extruded outer sheath (12) is extruded, the temperature of each section of the extrusion die of the extruder is required to be: 95℃ (feed port temperature), 120℃ (first melting section temperature), 130℃ (second melting section temperature), 140℃ (third melting section temperature), 150℃ (machine neck temperature), 160℃ (machine head temperature), 160℃ (die temperature).

[0037] The above only discloses one preferred embodiment of the application, of course, cannot limit the scope of the utility model, and those skilled in the art can understand that the all or part of the structure of the above-mentioned embodiment is realized, and the equivalent changes made according to the claims of the application still belong to the scope covered by the application.

Claims

1. A fire resistant radiation resistant communication cable for nuclear power plants, characterized in that, The cable comprises a conductor (1), an inner insulation layer (2), an outer insulation layer (3), a first mica tape (4), a first shielding layer (5), a first inner lining layer (6), a filling rope (7), a second mica tape (8), a total shielding layer, a second inner lining layer (11), and an outer sheath (12). The inner insulation layer (2) wraps the conductor (1), and the outer insulation layer (3) wraps the inner insulation layer (2). The conductor (1), the inner insulation layer (2), and the outer insulation layer (3) form an insulated core. A plurality of insulated cores are twisted to form a twisted core. The first mica tape (4) is wrapped around the twisted core. The first shielding layer (5) is arranged on the first mica tape (4). The first inner lining layer (6) wraps the first shielding layer (5) to form a twisted core assembly. A plurality of twisted core assemblies are combined with a plurality of filling ropes (7) to form a cable core. The second mica tape (8) wraps the cable core. The total shielding layer is wrapped around the second mica tape (8). The second inner lining layer (11) wraps the total shielding layer. The outer sheath (12) wraps the second inner lining layer (11).

2. The fire resistant radiation resistant communication cable for nuclear power plants according to claim 1, characterized in that, The total thickness of the inner insulation layer (2) and the outer insulation layer (3) is less than or equal to 0.7 mm.

3. The fire resistant radiation resistant communication cable for nuclear power plants according to claim 1, characterized in that, The material of the first shielding layer (5) is a copper plastic tape.

4. The fire resistant radiation resistant communication cable for nuclear power plants according to claim 1, characterized in that, The material of the filling rope (7) is a glass fiber yarn.

5. The fire resistant radiation resistant communication cable for nuclear power plants according to claim 1, characterized in that, The total shielding layer is composed of a leakage wire (9) and a second shielding layer (10). The material of the second shielding layer (10) is a copper plastic tape. The second shielding layer (10) wraps the second mica tape (8).

6. The fire resistant radiation resistant communication cable for nuclear power plants according to claim 1, characterized in that, The materials of the first inner lining layer (6) and the second inner lining layer (11) are halogen-free, low-smoke, flame-retardant, and oxygen-barrier materials.

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