Fireproof and explosion-proof cable

Abstract

The utility model relates to a fire-proof and explosion-proof cable, which comprises a conductor, an insulating layer, an outer sheath and an inner sheath, the surface of the insulating layer is coated with the semi-conductive shielding layer; the surface of the semi-conductive shielding layer is coated with the inner fireproof layer, and the inner fireproof layer, the conductor, the insulating layer and the semi-conductive shielding layer jointly form a wire; the composite outer fireproof layer wraps the outer sides of the wires and is of a sandwich structure, two surface layers are dip-coated high-temperature heat-insulation flame-retardant coating type fiber cloth, and a core layer is a ceramic fireproof fire-resistant composite belt; the shielding layer is coated on the composite outer fireproof layer; the isolating layer is coated on the shielding layer; and the sheath is coated on the isolating layer. The fireproof and fire-resistant composite belt has a sandwich structure, can be coated with a ceramic fireproof and fire-resistant composite belt and has a shearing force resisting effect, even if the interior is broken, the surface layer still coats the interior, the effect of cracking without leakage is achieved, and a fireproof isolation belt can still be effectively formed.

Description

Technical Field

[0001] This utility model relates to the field of cables, and in particular to a fireproof and explosion-proof cable. Background Technology

[0002] Fire-resistant and explosion-proof cables have broad application prospects and are mainly used in: key circuits such as fire alarm systems, emergency lighting, and power supplies for fire-fighting equipment in the building industry; power supply, signal transmission, and lighting systems in transportation hubs such as subways, high-speed railways, airports, and docks in the transportation industry; key infrastructure such as oil drilling platforms, natural gas pipelines, wind power stations, and nuclear power plants in the energy industry; data centers and communication networks; industrial fields such as petrochemicals, steel smelting, and pharmaceuticals; and important fields such as public safety and monitoring systems and aerospace. These places need to ensure the stable operation of electrical systems under extreme conditions to prevent serious safety accidents and social management chaos caused by power and communication interruptions due to fires.

[0003] For example, Chinese utility model patent announcement number CN 202839059 U discloses a ceramicized fire-resistant cable. This cable includes at least one set of core wires, inorganic filler, a second ceramicized fire-resistant composite tape, and a halogen-free, low-smoke, flame-retardant polyolefin sheath. The core wires are wrapped with the second ceramicized fire-resistant composite tape, and inorganic filler is used between the core wires and between the core wires and the second ceramicized fire-resistant composite tape. The outer layer of the second ceramicized fire-resistant composite tape is extruded with a halogen-free, low-smoke, flame-retardant polyolefin sheath. The ceramicized fire-resistant composite tape used in this cable becomes ceramicized after high temperatures. Although it can resist high temperatures, it becomes brittle. When the cable's internal structure is heated or the outer sheath expands due to heat, the ceramicized fire-resistant composite tape is easily cracked, causing it to lose its function of forming a fire-resistant barrier. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a fireproof and explosion-proof cable with a sandwich structure that can be covered with a ceramic fireproof and fire-resistant composite tape to resist shear force. Even if the inside is broken, the surface layer still covers the inside, achieving the effect of crack-free but not leaking, and can still effectively form a fireproof isolation zone.

[0005] To solve the above problems, a fireproof and explosion-proof cable is adopted, which includes:

[0006] conductor;

[0007] An insulating layer that covers the surface of a conductor;

[0008] A semi-conductive shielding layer that covers the surface of the insulating layer;

[0009] The inner fireproof layer covers the surface of the semi-conductive shielding layer, and together with the conductor, insulation layer and semi-conductive shielding layer, it forms a single conductor.

[0010] The composite external fireproof layer covers the outside of multiple conductors and has a sandwich structure. The two outer layers are fiber cloth impregnated with high-temperature heat-insulating and flame-retardant coatings, and the core layer is a ceramicized fireproof and fire-resistant composite strip.

[0011] The shielding layer is wrapped around the composite outer fireproof layer;

[0012] An isolation layer, which covers the shielding layer;

[0013] The sheath covers the insulating layer.

[0014] With this structure, even though the ceramicized fireproof and fire-resistant composite strip in the composite outer fireproof layer becomes more brittle after ceramicization, it is covered by fiber cloth coated with high-temperature heat-insulating and flame-retardant coating on both sides. It only breaks inside the fiber cloth, while the fiber cloth on both sides still forms an integral whole with the composite strip, achieving the effect of breaking without leaking, and still effectively forming a fireproof isolation strip.

[0015] As a further improvement of this utility model, the conductor is made of stranded tin-copper alloy wire.

[0016] As a further improvement of this utility model, the insulating layer is made of fluoroplastic extrusion molding.

[0017] As a further improvement of this utility model, the semi-conductive shielding layer uses fluoroplastic as the substrate and adds carbon black as a conductive filler in the extrusion molding process.

[0018] As a further improvement of this utility model, the inner fireproof layer is a ceramicized fireproof and fire-resistant composite strip.

[0019] As a further improvement of this utility model, the shielding layer is woven from tin-copper alloy wire.

[0020] As a further improvement of this utility model, the isolation layer is a semi-conductive cloth tape.

[0021] As a further improvement of this utility model, the sheath is made of silicone rubber.

[0022] As a further improvement of this utility model, hot melt adhesive is coated between the wires and honeycomb graphite balls are bonded together.

[0023] This structure, which eliminates the need for internal filler, contributes to the overall weight reduction of the cable. However, because the internal gas of the cable easily expands when heated, it can easily cause the cable to crack under high-temperature environments. Using honeycomb graphite spheres increases the surface area for gas adsorption, which helps regulate the internal gas pressure balance under high temperatures. Graphite spheres also possess excellent high-temperature resistance. With a melting point as high as 3850±50℃, graphite exhibits minimal weight loss even under ultra-high-temperature arc burning, and its coefficient of thermal expansion is also very low. Placed between the conductors, it helps to clamp the conductors, stabilizing the relative positions of the multiple conductors inside the cable. Its good thermal conductivity also helps to disperse heat. Attached Figure Description

[0024] Figure 1 This is a structural diagram of an embodiment.

[0025] Figure 2 This is a schematic diagram of a graphite ball bonded to a wire using hot melt adhesive.

[0026] Reference numerals: 1. Conductor; 2. Insulating layer; 3. Semi-conductive shielding layer; 4. Inner fireproof layer; 5. Composite outer fireproof layer; 501. Surface layer; 502. Core layer; 6. Shielding layer; 7. Isolation layer; 8. Sheath; 9. Hot melt adhesive; 10. Honeycomb graphite spheres. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Example 1

[0030] like Figures 1-2 As shown, a fireproof and explosion-proof cable includes:

[0031] Conductor 1;

[0032] Insulating layer 2, which covers the surface of conductor 1;

[0033] A semi-conductive shielding layer 3 is applied to the surface of the insulating layer 2;

[0034] The inner fireproof layer 4 covers the surface of the semi-conductive shielding layer 3, and together with the conductor 1, the insulating layer 2 and the semi-conductive shielding layer 3, it forms a wire.

[0035] The composite external fireproof layer 5 covers the outside of multiple conductors and has a sandwich structure. The two surface layers 501 are fiber cloth impregnated with high-temperature heat-insulating and flame-retardant coatings, and the core layer 502 is a ceramicized fireproof and fire-resistant composite strip.

[0036] The shielding layer 6 covers the composite outer fireproof layer 5;

[0037] The isolation layer 7 covers the shielding layer 6;

[0038] Sheath 8, which covers the isolation layer 7.

[0039] With this structure, even though the ceramicized fireproof and fire-resistant composite strip in the composite outer fireproof layer 5 has increased brittleness after ceramicization, it is covered by fiber cloth with high-temperature heat insulation and flame retardant coating on both sides. It only breaks inside the fiber cloth, while the fiber cloth on both sides still forms an integral whole with the composite strip, which can achieve the effect of breaking without leaking, and still effectively form a fireproof isolation strip.

[0040] In this embodiment, the conductor 1 is made of stranded tin-copper alloy wire.

[0041] In this embodiment, the insulating layer 2 is formed by extrusion molding of fluoroplastic.

[0042] In this embodiment, the semiconductive shielding layer 3 uses fluoroplastic as the substrate and carbon black as a conductive filler, which is then extruded.

[0043] In this embodiment, the inner fireproof layer 4 is a ceramicized fireproof and fire-resistant composite strip.

[0044] In this embodiment, the shielding layer 6 is woven from tin-copper alloy wire.

[0045] In this embodiment, the isolation layer 7 is a semi-conductive fabric tape.

[0046] In this embodiment, the sheath 8 is made of silicone rubber.

[0047] In this embodiment, hot melt adhesive 9 is applied between the wires and honeycomb graphite balls 10 are bonded together.

[0048] This structure, which eliminates the need for internal filler, contributes to the overall weight reduction of the cable. However, because the internal gas of the cable easily expands when heated, it can easily cause the cable to crack under high-temperature environments. Using honeycomb graphite spheres increases the surface area for gas adsorption, which helps regulate the internal gas pressure balance under high temperatures. Graphite spheres also possess excellent high-temperature resistance. With a melting point as high as 3850±50℃, graphite exhibits minimal weight loss even under ultra-high-temperature arc burning, and its coefficient of thermal expansion is also very low. Placed between the conductors, it helps to clamp the conductors, stabilizing the relative positions of the multiple conductors inside the cable. Its good thermal conductivity also helps to disperse heat.

[0049] The preparation method of this embodiment includes:

[0050] 1) Twisting tin-copper alloy wires together yields conductor 1, a tin-copper alloy composite stranded wire;

[0051] 2) Extruding fluoroplastic onto the outside of the conductor 1 obtained in step 1) as an insulating layer 2;

[0052] 3) Extruding semi-conductive fluoroplastic onto the surface of the insulating layer 2 as a semi-conductive shielding layer 3;

[0053] 4) A ceramicized fireproof and fire-resistant composite tape is wrapped around the outside of the insulating shielding layer 3 as an inner fireproof layer 4;

[0054] 5) A composite outer fireproof layer is formed by sequentially wrapping a fiber cloth impregnated with high-temperature heat-insulating and flame-retardant coating, a ceramicized fireproof and fire-resistant composite tape, and another fiber cloth impregnated with high-temperature heat-insulating and flame-retardant coating around the outer surface of the inner fireproof layer 4.

[0055] 6) A tin-copper alloy wire is woven as a shielding layer outside the composite fireproof layer;

[0056] 7) Wrap a semi-conductive cloth tape around the shielding layer 6 as an isolation layer 7;

[0057] 8) Extrude silicone rubber as a sheath 8 onto the outer layer 7.

[0058] Before step 5), hot melt adhesive is applied to the outer surface of the three wires and honeycomb graphite balls are bonded together.

[0059] In this embodiment, the cable produced by the above method has the following outstanding advantages:

[0060] 1. Fire Resistance: This cable has withstood a 24-hour flame test at 1093℃~1200℃ without spreading, producing any flammable droplets, exhibiting no momentary interruptions or short circuits, and maintaining an insulation resistance of at least 1000MΩ·km. It self-extinguishes within 3 seconds of removing the fire source. Following the test, it passed an AC 2500V, 5-minute withstand voltage test without breakdown, ensuring continued safe use. The relevant test conditions and performance indicators far exceed those of the British BS6387 and the domestic GB / T19666 fire resistance standards.

[0061] 2. Explosion-proof: This cable can maintain extremely high insulation resistance (above 1000MΩ.km) and withstand voltage (AC2500V, 1min without breakdown) in both flame and normal temperature environments. All materials involved have excellent heat resistance. The cable has low capacitance and anti-static properties, and meets the explosion-proof requirements of IEC60079 and GB3836.

[0062] 3. Resistance to high and low temperature shock: The cable was subjected to a cycle of 30 minutes each in an environment of -65℃±2℃ and +400℃±3℃, and a total of 10 cycles of thermal shock were performed. After the AC withstand voltage test of 2500V for 5 minutes, it did not break down.

[0063] 4. Chemical corrosion resistance: After immersing the cable in 5% sodium chloride, 100LL aviation gasoline, RP4350 aviation hydraulic oil, No. 3 turbine aviation kerosene, 4109 aviation lubricating oil, SkydrolLd-4 flame-retardant aviation hydraulic oil, 4050 aviation lubricating oil, and 5% sodium hypochlorite for 5 hours, it did not break down in the AC withstand voltage test of 2500V for 5 minutes, and did not crack under load bending.

[0064] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and all such modifications, with identical performance or use, should be considered within the protection scope of the present invention.

Claims

1. A fireproof and explosion-proof cable, characterized in that... include: Conductor (1); An insulating layer (2) is applied to the surface of the conductor (1); A semiconductive shielding layer (3) is wrapped around the surface of the insulating layer (2); The inner fireproof layer (4) covers the surface of the semi-conductive shielding layer (3), and together with the conductor (1), the insulating layer (2) and the semi-conductive shielding layer (3), it forms a conductor; The composite external fireproof layer (5) is wrapped around the outside of multiple conductors. It is a sandwich structure. The two outer layers (501) are fiber cloth impregnated with high temperature heat insulation and flame retardant coating, and the core layer (502) is ceramic fireproof and fire-resistant composite strip. A shielding layer (6) is wrapped around a composite outer fireproof layer (5); An isolation layer (7) covers the shielding layer (6); Sheath (8) covers the isolation layer (7).

2. The fireproof and explosion-proof cable according to claim 1, characterized in that... The conductor (1) is made of stranded tin-copper alloy wire.

3. The fireproof and explosion-proof cable according to claim 1, characterized in that... The insulating layer (2) is formed by extrusion molding of fluoroplastics.

4. The fireproof and explosion-proof cable according to claim 1, characterized in that... The semi-conductive shielding layer (3) is made of fluoroplastic as the substrate and carbon black is added as a conductive filler and extruded.

5. The fireproof and explosion-proof cable according to claim 1, characterized in that... The inner fireproof layer (4) is a ceramic fireproof and fire-resistant composite strip.

6. The fireproof and explosion-proof cable according to claim 1, characterized in that... The shielding layer (6) is woven from tin-copper alloy wire.

7. The fireproof and explosion-proof cable according to claim 1, characterized in that... The isolation layer (7) is a semi-conductive fabric tape.

8. The fireproof and explosion-proof cable according to claim 1, characterized in that... The sheath (8) is made of silicone rubber.

9. The fireproof and explosion-proof cable according to claim 1, characterized in that... Hot melt adhesive (9) is applied between the wires and honeycomb graphite balls (10) are bonded together.

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