Flame-retardant cable capable of preventing burning dripping

Abstract

The utility model discloses a flame-retardant cable capable of preventing burning dripping, which comprises a copper core, an insulating layer arranged on the outer surface of the copper core, a shielding layer arranged on the outer surface of the insulating layer, an inner protection layer arranged on the outer surface of the shielding layer, and a fire blocking layer overlapped and wrapped on the periphery of the inner protection layer. The production process of combustible substances in the cable is slow, heat can be taken away by release of crystal water in the process of decomposing the material of the cable into a shell, and the temperature of the cable body is reduced, so that the heat release rate and the total heat release amount of the flame-retardant cable are greatly reduced; meanwhile, comburent generated when materials on the cable are decomposed can form a complete shell and cannot be broken, and no combustible particulate matter overflows, so that the flame-retardant performance of the flame-retardant cable can be improved from the two aspects of passive heat insulation and cooling and restraint of the combustible particulate matter; and the common low-smoke halogen-free cable can meet the requirement of B1d0-level combustion performance without using an expensive low-smoke halogen-free sheath material.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a flame-retardant cable for preventing combustion dripping. Background Technique

[0002] A flame-retardant cable refers to a cable that can delay the spread of fire and reduce the expansion of fire losses in the event of a fire accident. With the upgrading of the requirements of the fire protection design code for the flame-retardant performance of cables, more and more application scenarios not only put forward requirements for the performance of cables to delay the spread of fire, but also have more specific requirements for the heat release rate of cables during the flame combustion state, the state of dripping objects during combustion, the smoke and flue gas toxicity released during combustion. The highest grade of the combustion performance of a cable containing organic matter is B1 level, and there should be no combustion dripping objects (d0 level) during the combustion test, the flue gas is non-toxic and non-corrosive, and the light transmittance of the smoke density is not less than 60%.

[0003] At present, in the prior art, ordinary low-smoke and halogen-free sheath materials can meet the requirements of cables to delay the spread of fire and the flue gas generated by combustion is non-toxic and non-corrosive and the light transmittance of the smoke density is not less than 60% by adding environmentally friendly and non-toxic flame retardants. By increasing the heat insulation and oxygen isolation layer, it is easy to control the heat release rate of the cable to meet the standard requirements, and the most difficult requirement to meet is that there should be no combustion dripping objects during the combustion test. Content of the Utility Model

[0004] The purpose of the utility model is to provide a flame-retardant cable for preventing combustion dripping to solve the problem of combustion dripping objects during the combustion process of the cable mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a flame-retardant cable for preventing combustion dripping, including a copper core, an insulating layer is arranged on the outer surface of the copper core, a shielding layer is arranged on the outer surface of the insulating layer, an inner protective layer is arranged on the outer surface of the shielding layer, a fire-blocking layer is overlapped and wound around the periphery of the inner protective layer, and the fire-blocking layer is made of a flame-retardant non-alkali fiberglass tape or a composite flame-retardant fiberglass tape.

[0006] Preferably, a steel strip is arranged between the fire-blocking layer and the inner protective layer.

[0007] Preferably, an outer protective layer is arranged outside the steel strip, and the outer protective layer is made of a low-smoke and halogen-free material.

[0008] Preferably, when the fire-blocking layer is made of a flame-retardant non-alkali fiberglass tape, silicone resin glue is applied between it and the outer protective layer, and then the silicone resin glue is cured through heat curing treatment.

[0009] Preferably, when the fire barrier layer is made of a composite flame-retardant fiberglass tape, the side of the composite flame-retardant fiberglass tape close to the outer sheath is a low-smoke and halogen-free film, and the other side is a flame-retardant non-alkali fiberglass cloth tape. When wrapping, the side made of the flame-retardant non-alkali fiberglass cloth tape is close to the outer surface of the outer sheath.

[0010] Preferably, the fire barrier layer is formed by single-layer overlapping wrapping of a composite flame-retardant fiberglass tape, and the overlapping rate of its single-layer overlapping wrapping is 30% to 50%.

[0011] The beneficial effects of the present invention are as follows:

[0012] In the present invention, through the arrangement of the fire barrier layer wrapped with a flame-retardant fiberglass tape or a composite flame-retardant fiberglass tape, it is possible to effectively prevent combustion drips, maintain the integrity of the low-smoke and halogen-free sheath layer of the cable, reduce the overflow of combustible gases decomposed from organic substances, and make the combustion performance of the cable fully meet the requirements of the B1d0-level combustion performance. Description of the Drawings

[0013] Figure 1 is a three-dimensional structural schematic diagram of a flame-retardant cable for preventing combustion drips proposed by the present invention;

[0014] Figure 2 is a cross-sectional top view structural schematic diagram of a flame-retardant cable for preventing combustion drips proposed by the present invention;

[0015] Figure 3 is an exploded schematic diagram of the structure of a flame-retardant cable for preventing combustion drips proposed by the present invention.

[0016] In the figure: 1, copper core; 2, insulating layer; 3, shielding layer; 4, inner sheath; 5, fire barrier layer; 6, steel strip; 7, outer sheath. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0018] Referring to Figures 1-3 , a flame-retardant cable for preventing combustion drips includes a copper core 1, an insulating layer 2 is provided on the outer surface of the copper core 1, a shielding layer 3 is provided on the outer surface of the insulating layer 2, an inner sheath 4 is provided on the outer surface of the shielding layer 3, a fire barrier layer 5 is overlapped and wrapped around the periphery of the inner sheath 4, and the fire barrier layer 5 is made of a flame-retardant non-alkali fiberglass cloth tape or a composite flame-retardant fiberglass tape.

[0019] When a fire breaks out in the laying section of the flame-retardant cable, due to the heat insulation of the fire-blocking layer 5, the generation process of combustible substances inside the cable is slow. At the same time, during the process of the cable material decomposing into a shell, the release of crystal water will carry away heat and reduce the temperature of the cable body, so that the heat release rate and the total heat release amount of the flame-retardant cable are greatly reduced; due to the restraint of the fire-blocking layer 5, the combustibles generated during the decomposition of the material on the cable will form a complete outer shell without breaking, and there will be no overflow of combustible particulate matter, enabling the flame-retardant cable to improve the flame-retardant performance of the cable from two aspects: passive heat insulation and cooling and restraint of combustible particulate matter, and enabling ordinary low-smoke and halogen-free cables to meet the requirements of B1d0-level combustion performance without using expensive low-smoke and halogen-free sheath materials.

[0020] Specifically, in this embodiment, a steel strip 6 is provided between the fire-blocking layer 5 and the inner sheath 4. By setting the steel strip 6, the impact resistance of the cable is improved, damage caused by rats gnawing is avoided, and the service life of the cable is increased.

[0021] Specifically, in this embodiment, an outer sheath 7 is provided outside the steel strip 6. The outer sheath 7 is made of low-smoke and halogen-free material, which can strengthen the protection of the cable and facilitate the connection between the outer sheath 7 and the fire-blocking layer 5.

[0022] Specifically, in this embodiment, when the fire-blocking layer 5 is made of flame-retardant non-alkali fiberglass tape, silicone resin glue is applied between it and the outer sheath 7, and then the silicone resin glue is cured by heat curing treatment, so that the cured silicone resin glue can firmly adhere the fire-blocking layer 5 to the outer sheath of the outer sheath 7, thereby increasing the adhesion of the fire-blocking layer 5.

[0023] Specifically, in this embodiment, when the fire-blocking layer 5 is made of composite flame-retardant fiberglass tape, one side of the composite flame-retardant fiberglass tape close to the outer sheath 7 is a low-smoke and halogen-free film, and the other side is a flame-retardant non-alkali fiberglass tape. When winding, the side made of flame-retardant non-alkali fiberglass tape is close to the outer surface of the outer sheath 7, so that one side of the fire-blocking layer 5 close to the outer sheath 7 can reach a micro-dissolved state with the outer surface of the outer sheath 7 through a heating component, and then the outer protective layer 7 and the fire-blocking layer 5 are bonded together through a heat-pasting process.

[0024] Specifically, in this embodiment, the fire-blocking layer 5 is formed by single-layer overlapping winding of composite flame-retardant fiberglass tape, and the overlapping rate of its single-layer overlapping winding is 30% - 50%, so that the outer sheath 7 can be completely wrapped, avoiding omissions in the wrapping range, and ensuring the wrapping thickness, thereby ensuring the fireproof performance of the fire-blocking layer. The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A flame-retardant cable that prevents burning and dripping, comprising a copper core (1), characterized in that: An insulating layer (2) is arranged on the outer surface of the copper core (1), a shielding layer (3) is arranged on the outer surface of the insulating layer (2), an inner protective layer (4) is arranged on the outer surface of the shielding layer (3), and a fire barrier layer (5) is overlapped and wrapped around the outer periphery of the inner protective layer (4), and the fire barrier layer (5) is made of a flame-retardant alkali-free glass cloth tape or a composite flame-retardant glass fiber tape.

2. The flame-retardant cable according to claim 1, characterized in that: A steel belt (6) is provided between the fire barrier layer (5) and the inner protective layer (4).

3. The flame-retardant cable according to claim 2, characterized in that: An outer protective layer (7) is arranged outside the steel strip (6), and the outer protective layer (7) is made of low-smoke zero-halogen material.

4. The flame-retardant cable according to claim 1, characterized in that: When the fire barrier layer (5) is made of flame-retardant alkali-free glass cloth tape, silicone resin glue is applied between the fire barrier layer (5) and the outer protective layer (7), and then the silicone resin glue is cured by thermal curing treatment.

5. The flame-retardant cable against burning and dripping according to claim 1, characterized in that: When the fire barrier layer (5) is made of a composite flame-retardant glass fiber tape, one side of the composite flame-retardant glass fiber tape close to the outer protective layer (7) is a low-smoke halogen-free film, and the other side is a flame-retardant alkali-free glass cloth tape. When wrapped, the side made of the flame-retardant alkali-free glass cloth tape is close to the outer surface of the outer protective layer (7).

6. The flame-retardant cable against burning and dripping according to claim 5, characterized in that: The fire barrier layer (5) is formed by overlapping and wrapping a single layer of composite flame-retardant glass fiber tape, and the overlapping rate of the single layer of overlapping and wrapping is 30% to 50%.

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