A composite fire-resistant flame-retardant cable and its production process

Abstract

The invention discloses a composite fire-resistant and flame-retardant cable and a production process thereof, and relates to the technical field of cables. The composite fire-resistant and flame-retardant cable comprises a wire core, a heat dissipation layer, a flame-retardant inner layer, an outer metal shielding layer, a highly flame-retardant fire-insulating layer, an armor layer, a buffer layer, and a protective layer, which are arranged in sequence from the inside to the outside. The heat dissipation layer is provided with a plurality of groups of pores, and the wire cores have multiple groups, and the plurality of groups of the wire cores are arranged in a ring array. The wire cores are wrapped in the heat dissipation layer, and the plurality of groups of the pores are evenly distributed on the inner circle side and the outer circle side between two adjacent groups of wire cores. The wire core comprises a conductor, a wrapping layer, an insulating layer, and an inner metal shielding layer, which are arranged in sequence from the inside to the outside. The wrapping layer is a mica tape wrapping, the insulating layer is an extruded cross-linked ethylene propylene rubber material, the inner metal shielding layer is a copper wire braided layer, the heat dissipation layer is an extruded thermal conductive silicone material, and the flame-retardant inner layer is a glass fiber braided layer. The invention has the characteristics of improving the fire resistance and flame retardancy of the cable.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a composite fire-resistant and flame-retardant cable and a production process thereof. Background Art

[0002] Fire-resistant cable is a high-strength cable with good insulation properties, cold and heat resistance, and resistance to bending and breaking. It is widely used in places related to fire safety and firefighting and lifesaving. Fire-resistant cable is mainly used as the power supply circuit of emergency power supply, and is required to work normally for a period of time during a fire. Since the ambient temperature rises sharply during a fire, fire-resistant cable needs to have a certain continuous working ability in the fire to avoid more serious hazards.

[0003] When traditional fire-resistant cables are in use, the cable conductors are arranged inside various protective layers. However, when the cable conductors are transmitting high voltage electricity, local high temperatures will be generated. In severe cases, the cables will be burned through from the inside, causing damage to the cable conductors.

[0004] When a power transmission cable encounters a fire, the cable will burn. Traditional cables can only set a flame retardant layer on the outside of the cable conductor to prevent the cable from burning. However, the flame retardant layer has limited flame retardant effect. When the fire is large, the flame retardant layer cannot play a flame retardant effect and the cable will still be burned. Therefore, it is necessary to design a composite fire-resistant and flame-retardant cable to improve the fire resistance of the cable. Summary of the invention

[0005] The object of the present invention is to provide a composite fire-resistant and flame-retardant cable and a production process thereof to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a composite fire-resistant and flame-retardant cable and its production process, comprising a wire core, a heat dissipation layer, a flame-retardant inner layer, an outer metal shielding layer, a high flame-retardant fire insulation layer, an armor layer, a buffer layer, and a protective layer arranged in sequence from the inside to the outside, wherein the heat dissipation layer is provided with a plurality of groups of pores.

[0007] According to the above technical solution, there are multiple groups of wire cores, and the multiple groups of wire cores are arranged in a ring array, and the wire cores are wrapped in the heat dissipation layer.

[0008] According to the above technical solution, several groups of air holes are evenly distributed on the inner ring side and the outer ring side between two adjacent groups of wire cores.

[0009] According to the above technical solution, the wire core includes a conductor, a wrapping layer, an insulating layer, and an inner metal shielding layer which are arranged in sequence from the inside to the outside.

[0010] According to the above technical solution, the wrapping layer is a mica tape wrapping, the insulating layer is an extruded cross-linked ethylene propylene rubber material, and the inner metal shielding layer is a copper wire braided layer.

[0011] According to the above technical scheme, the heat dissipation layer is an extruded thermally conductive silicone material, the flame retardant inner layer is a glass fiber braided layer, the outer metal shielding layer is a nickel-plated wire braided layer, the high flame retardant fire insulation layer is a wrapped rubber-coated glass cloth, the armor layer is woven from a number of twisted steel wire ropes, the buffer layer is woven from cotton yarn or cotton and linen and other materials, and the protective layer is an extruded low-smoke halogen-free flame retardant material.

[0012] According to the above technical scheme, a production process of a composite fire-resistant and flame-retardant cable is as follows:

[0013] S1: Conductor preparation, using copper, aluminum and other metal wires for twisting, and the conductor is obtained by regular twisting in the "1+6" arrangement. The outermost layer is twisted to the right, and the adjacent layers are twisted in the opposite direction;

[0014] S2: Wrap the prepared conductor with a mica tape using a wrapping machine to form a wrapping layer;

[0015] S3: Extruding the wrapped conductor with cross-linked EPDM rubber onto the wrapping layer using an extruder to form an insulating layer;

[0016] S4: Use a braiding machine to braid the copper wire on the outside of the insulation layer, cover the insulation layer, and form an inner metal shielding layer, thereby completing the production of the wire core;

[0017] S5: Arranging the multiple wire cores in a ring shape and using an extruder to extrude a thermal conductive silicone material to coat the multiple wire cores to form a heat dissipation layer;

[0018] S6: Using a weaving machine to weave glass fibers on the outside of the heat dissipation layer to form a flame retardant inner layer, thereby covering the heat dissipation layer;

[0019] S7: Using a braiding machine to braid nickel-plated wire on the outside of the flame-retardant inner layer to form an outer metal shielding layer to cover the flame-retardant inner layer;

[0020] S8: Use a wrapping machine to wrap the coated glass cloth around the outer side of the outer metal shielding layer to form a highly flame retardant fireproof layer, and then cover the outer metal shielding layer;

[0021] S9: Use a braiding machine to weave steel wire ropes on the outside of the high flame retardant fire insulation layer to form an armor layer, and cover the outer metal shielding layer;

[0022] S10: using a braiding machine to weave cotton yarn on the outer side of the armor layer to form a buffer layer;

[0023] S11: Use an extruder to extrude low-smoke halogen-free material to coat the outside of the buffer layer to form a protective layer, completing the cable production.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention provides flame retardant protection against external high temperature by providing a protective layer, buffers external moisture and temperature by providing a buffer layer, and isolates the ignition points generated externally by providing an armor layer to prevent the flame from burning internally.

[0025] By setting up a highly flame-retardant fire-insulating layer and a flame-retardant inner layer, the fire points generated from the outside are doubly isolated to improve the fire resistance and flame retardancy of the cable.

[0026] The ignition point generated by the conductor itself is isolated by providing a wrapping layer to prevent insufficient penetration of the insulation layer.

[0027] By providing a heat dissipation layer and air holes, the local high temperature generated by the wire core is dissipated to the surroundings and the air to prevent the temperature from being too high to cause a fire point. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] In the figure: 1. Wire core; 2. Heat dissipation layer; 3. Flame retardant inner layer; 4. Outer metal shielding layer; 5. High flame retardant fire insulation layer; 6. Armor layer; 7. Buffer layer; 8. Protective layer; 9. Conductor; 10. Wrapping layer; 11. Insulation layer; 12. Inner metal shielding layer; 13. Air holes. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 The present invention provides a technical solution: a composite fire-resistant and flame-retardant cable, comprising a wire core 1, a heat dissipation layer 2, a flame-retardant inner layer 3, an outer metal shielding layer 4, a high flame-retardant fire insulation layer 5, an armor layer 6, a buffer layer 7, and a protective layer 8 which are arranged in sequence from the inside to the outside.

[0033] There are multiple groups of wire cores 1 , which are arranged in a ring array, and the wire cores 1 are wrapped in the heat dissipation layer 2 .

[0034] The wire core 1 comprises a conductor 9, a wrapping layer 10, an insulating layer 11 and an inner metal shielding layer 12 which are arranged in sequence from the inside to the outside.

[0035] The wrapping layer 10 is wrapped with mica tape, and the number of wrapped layers of the mica tape is 3-6. The mica tape has the functions of insulation and fire prevention.

[0036] The insulating layer 11 is an extruded cross-linked EPDM rubber material with a thickness of 1 mm.

[0037] The inner metal shielding layer 12 is a copper wire braided layer with a braiding density of not less than 80% and a thickness of 0.4 mm, and is used to shield the electromagnetic field generated by the cable itself from interfering with external electronic components.

[0038] The heat dissipation layer 2 is an extruded thermally conductive silicone material, and is provided with a plurality of groups of pores 13, the diameter of the pores 13 is 3 mm, and the plurality of groups of pores 13 are evenly distributed on the inner circle side and the outer circle side between two adjacent groups of wire cores 1, and are used for heat conduction and heat dissipation through the thermally conductive silicone and the pores 13 when local heating occurs in the wire core 1.

[0039] The flame retardant inner layer 3 is a glass fiber braided layer, the density of the braided layer is not less than 90%, and the thickness is 0.4 mm. The glass fiber has the characteristics of good insulation, high heat resistance and strong corrosion resistance.

[0040] The outer metal shielding layer 4 is a nickel-plated wire braided layer with a braiding density of not less than 85% and a thickness of 0.3, which avoids signal transmission attenuation and interference coupling of strong electricity when the cable is laid crosswise with the power supply line.

[0041] The highly flame-retardant fire-insulating layer 5 comprises a wrapped adhesive-coated glass cloth having a thickness of 0.6 mm. The adhesive-coated glass cloth comprises a base cloth made of glass fiber and a metal hydrate flame-retardant adhesive solution dip-coated on the base cloth.

[0042] Hydrate flame retardant adhesive solution is a trivalent metal phosphoric acid aqueous solution. When it encounters an open flame, it immediately decomposes into metal oxides and precipitates crystal water. The metal oxides are adsorbed on the surface of the glass fiber cloth to form a porous shell. This shell has a certain adsorption effect on flue gas. In addition, the precipitated water can not only play a cooling role, but also has the effect of adsorbing and settling the smoke particles in the combustion process.

[0043] The armor layer 6 is woven from a number of twisted steel wire ropes, the density of the braided layer is not less than 80%, and the thickness is 1.5 mm. The armor layer 6 is used to ensure that the inside of the cable is not damaged by external mechanical forces in a relatively harsh laying environment, and at the same time has a barrier protection against external fire points and high temperatures.

[0044] The buffer layer 7 is woven from cotton yarn or cotton and linen and other materials. The density of the woven layer is not less than 90% and the thickness is 0.5 mm. It is separated between the armor layer 6 and the protective layer 8, plays a certain buffering role, improves the protective effect of the protective layer 8, and has a certain transition buffering effect on external moisture and temperature.

[0045] The protective layer 8 is an extruded low-smoke halogen-free flame-retardant material with a thickness of 1.5 mm, and has the functions of corrosion resistance, high temperature resistance and flame retardancy.

[0046] A production process of a composite fire-resistant and flame-retardant cable comprises the following steps:

[0047] S1: Conductor 9 is prepared by twisting metal wires such as copper and aluminum. Conductor 9 is twisted in a regular manner according to a "1+6" arrangement, with the outermost layer being twisted in the right direction and adjacent layers being twisted in opposite directions;

[0048] S2: Wrap the prepared conductor 9 with a mica tape using a wrapping machine to form a wrapping layer 10;

[0049] S3: Extruding the wrapped conductor 9 with cross-linked ethylene propylene rubber onto the wrapping layer 10 by using an extruder to form an insulating layer 11;

[0050] S4: using a braiding machine to braid the copper wire on the outside of the insulating layer 11, covering the insulating layer 11 to form an inner metal shielding layer 12, thereby completing the production of the wire core 1;

[0051] S5: Arranging the multiple wire cores 1 in a ring shape and using an extruder to extrude a thermally conductive silicone material to coat the multiple wire cores 1 to form a heat dissipation layer 2;

[0052] S6: using a braiding machine to weave glass fibers on the outside of the heat dissipation layer 2 to form a flame retardant inner layer 3, thereby covering the heat dissipation layer 2;

[0053] S7: using a braiding machine to braid nickel-plated wires on the outside of the flame-retardant inner layer 3 to form an outer metal shielding layer 4, thereby covering the flame-retardant inner layer 3;

[0054] S8: Using a wrapping machine to wrap the glue-coated glass cloth around the outer side of the outer metal shielding layer 4 to form a highly flame-retardant fire-insulating layer 5, thereby covering the outer metal shielding layer 4;

[0055] S9: Using a braiding machine to braid steel wire ropes on the outside of the high flame retardant fireproof layer 5 to form an armor layer 6, and to cover the outer metal shielding layer 4;

[0056] S10: using a braiding machine to weave cotton yarn on the outer side of the armor layer 6 to form a buffer layer 7;

[0057] S11: using an extruder to extrude low-smoke halogen-free material to coat the outside of the buffer layer 7 to form a protective layer 8, thereby completing the cable production.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A composite fire-resistant and flame-retardant cable, characterized in that: The invention comprises a wire core (1), a heat dissipation layer (2), a flame retardant inner layer (3), an outer metal shielding layer (4), a highly flame retardant fireproof layer (5), an armor layer (6), a buffer layer (7), and a protective layer (8) which are arranged in sequence from the inside to the outside, wherein the heat dissipation layer (2) is provided with a plurality of groups of pores (13).

2. A composite fire-resistant and flame-retardant cable according to claim 1, characterized in that: The wire cores (1) include a plurality of groups, and the plurality of groups of wire cores (1) are arranged in a ring array, and the wire cores (1) are wrapped in a heat dissipation layer (2).

3. A composite fire-resistant and flame-retardant cable according to claim 1, characterized in that: A plurality of groups of air holes (13) are evenly distributed on the inner ring side and the outer ring side between two adjacent groups of wire cores (1).

4. A composite fire-resistant and flame-retardant cable according to claim 1, characterized in that: The wire core (1) comprises a conductor (9), a wrapping layer (10), an insulating layer (11), and an inner metal shielding layer (12) which are arranged in sequence from the inside to the outside.

5. A composite fire-resistant and flame-retardant cable according to claim 4, characterized in that: The wrapping layer (10) is a mica tape wrapping, the insulating layer (11) is an extruded cross-linked ethylene propylene rubber material, and the inner metal shielding layer (12) is a copper wire braided layer.

6. A composite fire-resistant and flame-retardant cable according to claim 1, characterized in that: The heat dissipation layer (2) is an extruded heat-conducting silicone material, the flame-retardant inner layer (3) is a glass fiber braided layer, the outer metal shielding layer (4) is a nickel-plated wire braided layer, the high flame-retardant fire-insulating layer (5) is a wrapped rubber-coated glass cloth, the armor layer (6) is woven from a plurality of twisted steel wire ropes, the buffer layer (7) is woven from cotton yarn or cotton and linen, and the protective layer (8) is an extruded low-smoke halogen-free flame-retardant material.

7. A production process for a composite fire-resistant and flame-retardant cable according to claims 1-6, characterized in that: S1: Preparation of conductor (9), using copper, aluminum or other metal wires to twist, and regular twisting in a "1+6" arrangement to obtain conductor (9), wherein the outermost layer is twisted in the right direction, and adjacent layers are twisted in opposite directions; S2: using a wrapping machine to wrap the prepared conductor (9) with a mica tape to form a wrapping layer (10); S3: using an extruder to extrude the wrapped conductor (9) and coat the wrapped layer (10) with cross-linked ethylene propylene rubber to form an insulating layer (11); S4: using a braiding machine to braid the copper wire onto the outside of the insulating layer (11), covering the insulating layer (11) to form an inner metal shielding layer (12), thereby completing the production of the wire core (1); S5: arranging the multiple wire cores (1) in a ring shape and using an extruder to extrude a thermally conductive silicone material to coat the multiple wire cores (1) to form a heat dissipation layer (2); S6: using a braiding machine to weave glass fibers on the outside of the heat dissipation layer (2) to form a flame retardant inner layer (3), thereby covering the heat dissipation layer (2); S7: using a braiding machine to braid nickel-plated wires on the outside of the flame-retardant inner layer (3) to form an outer metal shielding layer (4), thereby covering the flame-retardant inner layer (3); S8: Using a wrapping machine to wrap the coated glass cloth around the outer side of the outer metal shielding layer (4) to form a highly flame retardant fireproof layer (5), thereby covering the outer metal shielding layer (4); S9: Using a braiding machine to braid steel wire ropes on the outside of the high flame retardant fireproof layer (5) to form an armor layer (6), and to cover the outer metal shielding layer (4); S10: using a braiding machine to weave cotton yarn on the outer side of the armor layer (6) to form a buffer layer (7); S11: using an extruder to extrude a low-smoke halogen-free material to coat the outside of the buffer layer (7) to form a protective layer (8), thereby completing the cable production.

Images