CN218568491U

CN218568491U - Mineral insulation crosslinked polyolefin sheath fireproof cable for nuclear industry

Info

Publication number: CN218568491U
Application number: CN202121221293.8U
Authority: CN
Inventors: 张佳亮; 叶小军; 杨建红; 周光亚; 徐志伟; 吴军
Original assignee: Hua Yuan High Techs Cable Co ltd
Current assignee: Hua Yuan High Techs Cable Co ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2023-03-03
Anticipated expiration: 2031-06-02

Abstract

The utility model discloses a mineral insulation cross-linked polyolefin sheath fireproof cable for nuclear industry, which comprises a cable core, and a buffer protection layer, an inner sheath layer, an insulating layer, a fireproof flame-retardant layer and an outer sheath layer which are sequentially coated outside the cable core; the cable core comprises a limiting buffer core and cable cores, the limiting buffer core comprises a central core and five partition plates, the five partition plates are uniformly arranged on the outer wall of the central core at intervals and vertically, a circle of first buffer holes are embedded in the central core at intervals, the number of the cable cores is five, the five cable cores are respectively arranged between two adjacent partition plates, and each cable core comprises a conductor and a fireproof wrapping layer wrapping the conductor; convex edges protruding towards the inner side are arranged on the inner wall of the buffer protection layer at intervals, the convex edges are clamped between every two adjacent wire cores respectively, and second buffer holes are formed in the inner parts of the convex edges and correspond to the positions of the partition plates; the fireproof flame-retardant layer comprises a heat-insulating layer, a flame-retardant layer and an oxygen-insulating layer. The utility model discloses aim at solving current fireproof cable fire behavior not enough, the compressive property scheduling problem more weak.

Description

Mineral insulation crosslinked polyolefin sheath fireproof cable for nuclear industry

Technical Field

The utility model relates to the technical field of cables, especially, relate to a mineral insulation crosslinked polyolefin sheath fireproof cable for nuclear industry.

Background

Cables are typically formed by twisting several or more groups of at least two conductors, each group insulated from each other and usually twisted around a center, with a highly insulating coating covering the entire circumference. The cable has the characteristics of internal electrification and external insulation. In order to ensure the safety of data, people hope to have enough time to return all data to the cage before the whole network is broken down and transfer them to a safe place after a fire happens, so as to reduce the possibility of data loss to the minimum.

The existing fireproof cable still has defects in fireproof performance, the time for the cable to keep normal communication in a fire disaster is short, meanwhile, the compression resistance of the existing fireproof cable is weak, and the cable is often damaged and broken due to the fact that the cable is under external pressure in the laying and working processes.

To above technical problem, the utility model discloses a mineral insulation crosslinked polyolefin sheath fireproof cable for nuclear industry, the utility model has the advantages of improve the fire behavior and the compressive property of cable, extension cable life.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a nuclear industrial mineral insulation crosslinked polyolefin sheath fireproof cable to the fire behavior who solves fireproof cable among the prior art exists not enoughly, and compressive property is more weak class of technical problem, the utility model has the advantages of improve the fireproof performance and compressive property, extension cable life of cable.

The utility model discloses a following technical scheme realizes: the utility model discloses a mineral insulation cross-linked polyolefin sheath fireproof cable for nuclear industry, which comprises a cable core, and a buffer protection layer, an inner sheath layer, an insulating layer, a fireproof flame-retardant layer and an outer sheath layer which are sequentially coated outside the cable core; the cable core comprises a limiting buffer core and five wire cores, the limiting buffer core comprises a center core and partition plates, the five partition plates are uniformly arranged on the outer wall of the center core at intervals, a circle of first buffer holes are embedded in the center core at intervals, the first buffer holes correspond to the partition plates respectively, the number of the wire cores is five, the five wire cores are arranged between two adjacent partition plates respectively, and each wire core comprises a conductor and a fireproof wrapping layer wrapping the conductor; convex edges protruding towards the inner side are arranged on the inner wall of the buffering protective layer at intervals, the convex edges are clamped between two adjacent wire cores respectively, an arc groove is formed in one end, opposite to the convex edges, of the partition plate, the top end of each convex edge is clamped in the arc groove, second buffering holes are formed in the convex edges and correspond to the partition plate in position, and the buffering protective layer and the limiting buffering cores are made of TPU elastomer materials; the fireproof flame-retardant layer comprises a heat-insulating layer, a flame-retardant layer and an oxygen-insulating layer, the heat-insulating layer is made of ceramic silicon rubber materials, the flame-retardant layer is woven by quartz fibers, and the oxygen-insulating layer is formed by mixing and filling magnesium hydroxide and aluminum hydroxide.

Preferably, for the tensile strength of improvement cable, the inside of buffer protection layer still inlays to be established by tensile core, and tensile core is located the both sides of second cushion hole respectively, and tensile core is aramid fiber rope.

Preferably, for the structural strength who improves spacing buffering core to improve its compressive property when guaranteeing that spacing buffering core has fine buffering effect, and then improve the compressive property of cable, the inside of center core still is provided with the reinforcement core, and the reinforcement core is located the inboard in first buffering hole, and the middle part of baffle is provided with the reinforcing plate, and the reinforcement core all adopts the nylon materials to make with the reinforcing plate.

Preferably, the conductor is a profiled wire stranded copper conductor.

Preferably, the inner sheath layer is made of an aluminum-based composite material, the aluminum-based composite material is a material which has strong vitality and emerges according to the requirements of modern scientific development, the inner sheath layer is formed by compounding two or more materials with different properties through various process means, wherein the matrix is an aluminum-based alloy, the reinforcement can be a nanofiber material such as carbon fiber, boron fiber and the like, or can be a nanoparticle material such as silicon carbide, aluminum oxide and the like, and the aluminum-based composite material has excellent mechanical properties.

Preferably, the insulating layer is formed by co-extruding a double-layer irradiation crosslinking polyolefin material, the heat resistance of the cable taking irradiation crosslinking polyethylene as the insulating layer is higher than that of polyvinyl chloride, the cable can be used at 90 ℃ for a long time, and the heat resistance temperature during short circuit can reach 250 ℃ to the maximum; the insulation resistance is high, the dielectric loss tangent is small, and the insulation resistance is basically not changed along with the change of temperature; has good wear resistance and environmental stress cracking resistance.

Preferably, the fire-resistant wrapping layer is formed by wrapping mica tapes, and the mica tapes are also called fire-resistant mica tapes and have excellent fire resistance.

Preferably, the outer sheath layer is made of radiation cross-linked low-smoke halogen-free flame-retardant polyolefin material.

The utility model has the advantages of it is following:

(1) The utility model discloses in be provided with fire prevention fire-retardant layer between insulating layer and oversheath layer, fire prevention fire-retardant layer includes the insulating layer, fire-retardant layer and separates the oxygen layer, the insulating layer adopts ceramic silicon rubber material to make, fire-retardant layer adopts quartz fiber to work out, separate the oxygen layer and form by magnesium hydroxide and aluminium hydroxide mixed packing, ceramic silicon rubber material has splendid fire prevention, fire-retardant, low smoke, characteristics such as nontoxic, extrusion molding simple process, its residue is hard ceramic casing after burning, the crust does not melt and does not drip in the conflagration environment, play fire-retardant thermal-insulated effect, quartz fiber is an inorganic fiber who uses high-purity quartz or natural quartzy as raw materials and make, the diameter is generally several microns ~ tens of microns, it has kept some characteristics and performance of solid quartz, ablation resistance, be an excellent high temperature resistant material, aluminium hydroxide and magnesium hydroxide all have fire-retardant, smoke suppression and filling function, thereby play fine oxygen and fire-retardant performance, the outside of conductor still is provided with fire-resistant wrapping layer, thereby, the utility model discloses the fire-proof performance of cable is showing to be promoted;

(2) The utility model discloses in, the cable core includes spacing buffering core and sinle silk, spacing buffering core includes center core and baffle, the number of baffle is five, five even intervals of baffle and perpendicular setting are on the periphery wall of center core, the inside interval of center core inlays and is equipped with the first buffering hole of round, first buffering hole corresponds with the baffle position respectively, the number of sinle silk is five, five sinle silks set up respectively between two adjacent baffles, the outside of cable core is provided with the buffer protection layer, the interval is provided with to the bellied bead in the inboard on the inner wall of buffer protection layer, the bead block is respectively between two adjacent sinle silks, the baffle is provided with the arc groove with the one end that the bead is relative, the top block of bead is in the arc groove, the inside of bead corresponds with the baffle position and is provided with second buffering hole, the buffer protection layer all adopts TPU elastomer material to make with spacing buffering core, thereby when the cable receives external pressure, the buffer protection layer can play the effect of buffering protection to the sinle silk with spacing buffering core, the effect of buffering through setting up the buffering effect of first buffering hole with the second buffering hole, and then the both sides that the tensile strength that the buffering core has improved the buffering effect when the cable structure, thereby the tensile strength of spacing buffering core has improved the tensile buffering core, the both sides of the tensile strength of the tensile buffering core structure.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a sectional view of a limiting buffer core;

FIG. 3 is a cross-sectional view of a buffer protection layer.

In the figure: 1. a cable core; 11. a buffer core is limited; 111. a central core; 112. a partition plate; 12. a wire core; 121. a conductor; 122. a fire-resistant wrapping layer; 2. a buffer protection layer; 21. a rib; 22. a tensile core; 3. an inner jacket layer; 4. an insulating layer; 5. a fire resistant and flame retardant layer; 51. a thermal insulation layer; 52. a flame retardant layer; 53. an oxygen barrier layer; 6. an outer jacket layer; 7. a first buffer hole; 8. a reinforcing core; 9. a reinforcing plate; 10. an arc groove; 100. a second buffer hole.

Detailed Description

The embodiments of the present invention will be described in detail below, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example 1

Embodiment 1 discloses a mineral insulation cross-linked polyolefin sheath fireproof cable for nuclear industry, which comprises a cable core 1, and a buffer protection layer 2, an inner sheath layer 3, an insulation layer 4, a fireproof flame-retardant layer 5 and an outer sheath layer 6 which are sequentially coated outside the cable core 1, wherein the inner sheath layer 3 is made of an aluminum-based composite material, the insulation layer 4 is formed by co-extruding a double-layer irradiation cross-linked polyolefin material, and the outer sheath layer 6 is made of an irradiation cross-linked low-smoke halogen-free flame-retardant polyolefin material; the cable core 1 comprises a limiting buffer core 11 and a cable core 12; as shown in fig. 1 and 2, the limiting buffer core 11 includes a central core 111 and partition plates 112, the number of the partition plates 112 is five, the five partition plates 112 are uniformly spaced and vertically arranged on the outer wall of the central core 111, a circle of first buffer holes 7 are embedded in the central core 111 at intervals, the first buffer holes 7 respectively correspond to the partition plates 112 in position, a reinforcing core 8 is further arranged in the central core 111, the reinforcing core 8 is located inside the first buffer holes 7, a reinforcing plate 9 is arranged in the middle of each partition plate 112, the reinforcing cores 8 and the reinforcing plates 9 are both made of nylon materials, the number of the wire cores 12 is five, the five wire cores 12 are respectively arranged between two adjacent partition plates 112, each wire core 12 includes a conductor 121 and a fire-resistant lapping layer 122 covering the conductor 121, the conductor 121 is a specially-shaped stranded copper conductor, and the fire-resistant lapping layer 122 is made of a mica tape; as shown in fig. 1 and 3, ribs 21 protruding inward are arranged on the inner wall of the buffer protective layer 2 at intervals, the ribs 21 are respectively clamped between two adjacent wire cores 12, an arc groove 10 is arranged at one end of the partition plate 112 opposite to the ribs 21, the top end of each rib 21 is clamped in the arc groove 10, a second buffer hole 100 is arranged in the rib 21 corresponding to the partition plate 112, the buffer protective layer 2 and the limiting buffer core 11 are both made of TPU elastomer materials, a tensile core 22 is also embedded in the buffer protective layer 2, the tensile cores 22 are respectively located at two sides of the second buffer hole 100, and the tensile core 22 is an aramid fiber rope; the fireproof flame-retardant layer 5 comprises a heat-insulating layer 51, a flame-retardant layer 52 and an oxygen-insulating layer 53, wherein the heat-insulating layer 51 is made of a ceramic silicon rubber material, the flame-retardant layer 52 is woven by quartz fibers, and the oxygen-insulating layer 53 is formed by mixing and filling magnesium hydroxide and aluminum hydroxide.

The principle of the utility model is as follows: the utility model discloses in be provided with fire prevention fire-retardant layer 5 between insulating layer 4 and oversheath layer 6, fire prevention fire-retardant layer 5 includes insulating layer 51, fire-retardant layer 52 and oxygen layer 53 separate, insulating layer 51 adopts ceramic silicon rubber material to make, fire-retardant layer 52 adopts quartz fiber to compile, oxygen layer 53 is filled with magnesium hydroxide and aluminium hydroxide mixture to form, ceramic silicon rubber material has splendid fire prevention, fire-retardant, low cigarette, characteristics such as nontoxic, extrusion moulding simple process, its residue is hard ceramic shell after burning, the crust does not melt and does not drip in the fire environment, play fire-retardant thermal-insulated effect, quartz fiber is a quartzy inorganic fiber who makes with high-purity quartz or natural as the raw materials, the diameter is generally several microns ~ tens of microns, it has kept some characteristics and the performance of solid quartz, resistant ablation, be an excellent high temperature resistant material, aluminium hydroxide and magnesium hydroxide all have fire-retardant, smoke suppression and filling function, thereby play fine oxygen and fire-retardant performance separate, the outside of conductor 121 still is provided with wrapping layer 122, thereby the utility model discloses fire-resistant performance is showing; the utility model discloses in, cable core 1 is including spacing buffering core 11 and sinle silk 12, spacing buffering core 11 includes center core 111 and baffle 112, baffle 112's number is five, five even intervals of baffle 112 and perpendicular setting are on center core 111's periphery wall, center core 111's inside interval inlays and is equipped with the first buffering hole 7 of round, first buffering hole 7 corresponds with baffle 112 position respectively, sinle silk 12's number is five, five sinle silks 12 set up respectively between two adjacent baffles 112, cable core 1's outside is provided with buffering protective layer 2, the interval is provided with to the bellied bead 21 in the inboard on buffering protective layer 2's the inner wall, bead 21 block is between two adjacent sinle silks 12 respectively, baffle 112 and bead 21 relative one end is provided with arc groove 10, bead 21's top block is in arc groove 10, bead 21's inside corresponds with baffle 112 position and is provided with second buffering hole 100, buffering protective layer 2 all adopts TPU elastomer material to make with spacing buffering core 11, thereby when cable receives external pressure, buffering protective layer 2 can play the spacing buffering core 11 and then to the spacing buffering core 11 and the tensile buffering effect that the cable has set up the buffering core and has improved buffering core's effect in addition buffering core's tensile strength and buffering core's buffering effect has improved buffering core 11, buffering effect and buffering core's tensile buffering effect has improved buffering core's buffering effect and buffering core's tensile buffering effect and buffering effect has improved buffering effect in spacing buffering core 11 in addition.

Claims

1. A mineral insulation cross-linked polyolefin sheath fireproof cable for nuclear industry is characterized by comprising a cable core, and a buffer protection layer, an inner sheath layer, an insulation layer, a fireproof flame-retardant layer and an outer sheath layer which are sequentially coated outside the cable core;

the cable core comprises a limiting buffer core and wire cores, the limiting buffer core comprises a central core and five clapboards, the five clapboards are uniformly arranged on the outer wall of the central core at intervals, a circle of first buffer holes are embedded in the central core at intervals, the first buffer holes correspond to the clapboards respectively in position, the wire cores are five in number, the five wire cores are arranged between two adjacent clapboards respectively, and the wire cores comprise conductors and fire-resistant wrapping layers wrapping the conductors;

the inner wall of the buffer protective layer is provided with convex edges protruding towards the inner side at intervals, the convex edges are respectively clamped between two adjacent wire cores, one end of the partition opposite to the convex edges is provided with an arc groove, the top ends of the convex edges are clamped in the arc groove, second buffer holes are formed in the convex edges corresponding to the partition, and the buffer protective layer and the limiting buffer core are both made of TPU (thermoplastic polyurethane) elastomer materials;

the fireproof flame-retardant layer comprises a heat-insulating layer, a flame-retardant layer and an oxygen-insulating layer, the heat-insulating layer is made of ceramic silicon rubber materials, the flame-retardant layer is woven by quartz fibers, and the oxygen-insulating layer is formed by mixing and filling magnesium hydroxide and aluminum hydroxide.

2. The mineral-insulated crosslinked polyolefin-sheathed fireproof cable for the nuclear industry as claimed in claim 1, wherein tensile cores are embedded in the buffer protective layer, the tensile cores are respectively positioned at two sides of the second buffer hole, and the tensile cores are aramid fiber ropes.

3. The mineral insulated crosslinked polyolefin sheathed fireproof cable for the nuclear industry as claimed in claim 1, wherein a reinforcing core is further disposed inside the central core, the reinforcing core is located inside the first buffer hole, a reinforcing plate is disposed in the middle of the partition, and the reinforcing core and the reinforcing plate are both made of nylon material.

4. The mineral insulated crosslinked polyolefin sheathed fireproof cable for the nuclear industry according to claim 1, wherein the conductor is a profiled wire stranded copper conductor.

5. The mineral insulated crosslinked polyolefin sheathed fireproof cable for the nuclear industry according to claim 1, wherein the inner sheath layer is made of an aluminum matrix composite.

6. The mineral insulated crosslinked polyolefin sheathed fireproof cable for the nuclear industry according to claim 1, wherein the insulating layer is co-extruded from a double-layer irradiation crosslinked polyolefin material.

7. The mineral insulated crosslinked polyolefin sheathed fireproof cable for the nuclear industry according to claim 1, wherein the fire-resistant wrapping layer is wrapped by mica tape.

8. The mineral insulated crosslinked polyolefin sheathed fireproof cable for the nuclear industry according to claim 1, wherein the outer sheath layer is made of radiation crosslinked low smoke zero halogen flame retardant polyolefin material.