B2 flame-retardant cable for special environment

Abstract

The utility model discloses a B2 flame-retardant cable for a special environment, and the cable sequentially comprises an outer sheath, a corrugated copper pipe, a first flame-retardant filling layer, an outer flame-retardant layer, a wrapping layer, and a second flame-retardant filling layer from the outside to the inside. And a supporting framework, a plurality of first cable cores, a plurality of second cable cores and a third cable core are arranged in the second flame-retardant filling layer. The flame-retardant cable is provided with multiple cable cores, so that the requirements of different application scenes can be met, and the application is wider. The cable is provided with a plurality of flame-retardant layers, and the wrapping layer, the inner sheath and the outer sheath are made of flame-retardant materials, so that the flame-retardant performance of the cable is good. The overall supporting effect of the cable is good through the supporting framework, and the cable cores are arranged in the corresponding containing grooves or containing through holes respectively, so that the protection effect on the cable cores is good. And meanwhile, shielding copper foils are arranged in the accommodating grooves and the accommodating through holes, so that signal interference among the cable cores is reduced.

Description

Technical Field

[0001] This utility model relates to the field of cables, and more specifically, to a B2 flame-retardant cable for special environments. Background Technology

[0002] Cables, as essential devices for transmitting electrical energy and signals, play a vital role in various fields. With continuous technological innovation and development, the performance and application scenarios of cables will continue to expand and improve. Beyond power systems and communications, cables also play a crucial role in industries such as transportation, construction, and aerospace.

[0003] While some existing cables incorporate flame-retardant layers, their flame-retardant effect remains unsatisfactory, particularly in industries such as petroleum, petrochemicals, and rail transportation. In the event of a fire, these cables could ignite rapidly and spread, potentially leading to explosions and other major accidents, posing significant risks to personal safety and the environment. Some cables use a single type of core, making it difficult to meet the needs of diverse applications and causing inconvenience in use. Other cables have multiple cores, but insufficient arrangement and shielding between the cores can lead to signal interference. This interference can affect the cable's transmission performance and stability, resulting in data loss or transmission errors. Utility Model Content

[0004] The present invention aims to overcome the defects of the prior art and provide a B2 flame-retardant cable for special environments.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a B2 flame-retardant cable for special environments, comprising, from the outside to the inside, an outer sheath, a corrugated copper tube, a first flame-retardant filling layer, an outer flame-retardant layer, a wrapping layer, and a second flame-retardant filling layer. The outer sheath is made of halogen-free, low-smoke, flame-retardant polyolefin sheath; the first flame-retardant filling layer is made of magnesium oxide powder; the wrapping layer is made of halogen-free flame-retardant tape; and the second flame-retardant filling layer is made of rock wool rope. The second flame-retardant filling layer contains a support frame, multiple first cable cores, multiple second cable cores, and a third cable core. The support frame has multiple first receiving slots capable of accommodating the first cable cores and multiple receiving slots capable of accommodating... The second receiving groove for the second cable core is provided, and the center of the support frame has a receiving through hole for installing the third cable core. The inner walls of the first receiving groove, the second receiving groove, and the receiving through hole are all provided with shielding copper foil. The first cable core includes, from the inside out, a first conductor, a first insulation layer, a first inner flame retardant layer, and a first inner sheath. The second cable core includes, from the inside out, a second conductor, a second insulation layer, a second inner flame retardant layer, and a second inner sheath. The third cable core includes, from the inside out, a third conductor, a third insulation layer, a third inner flame retardant layer, and a third inner sheath. The first, second, and third inner sheaths are all made of halogen-free, low-smoke, flame-retardant polyolefin sheaths.

[0006] Furthermore, the shielding copper foil is divided into a first shielding copper foil, a second shielding copper foil, and a third shielding copper foil. The first shielding copper foil is located between the first receiving groove and the first cable core, the second shielding copper foil is located between the second receiving groove and the second cable core, and the third shielding copper foil is located between the receiving through hole and the third cable core.

[0007] This reduces signal interference between the cable cores.

[0008] Furthermore, the cross-sections of the first and second shielding copper foils are both semi-circular, while the cross-section of the third shielding copper foil is circular.

[0009] Furthermore, the first insulating layer, the second insulating layer, and the third insulating layer are all made of cross-linked polyethylene.

[0010] Therefore, the cable has good insulation performance.

[0011] Furthermore, the first cable core and the second cable core are the same in number and are distributed alternately.

[0012] Therefore, the cable has good structural stability.

[0013] Furthermore, multiple first cable cores are distributed in a ring with equal spacing, and multiple second cable cores are distributed in a ring with equal spacing.

[0014] This further improves the structural stability of the cable.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The flame-retardant cable of this application has multiple flame-retardant layers, and the wrapping layer and inner and outer sheaths are also made of flame-retardant materials, thus the cable has good flame-retardant performance.

[0017] 2. The flame-retardant cable of this application has multiple cable cores, which can meet the needs of different application scenarios and has a wider range of applications.

[0018] 3. The flame-retardant cable of this application is provided with a support frame, which provides good overall support for the cable. Furthermore, each cable core is set in a corresponding receiving groove or receiving through hole, which provides good protection for the cable core.

[0019] 4. The flame-retardant cable of this application has shielding copper foil installed in the receiving groove and receiving through hole, thereby reducing signal interference between the cable cores. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cable structure;

[0021] Figure 2 This is a magnified view of region A;

[0022] Figure 3 This is a cross-sectional view of the cable;

[0023] Figure 4 This is a magnified view of region B.

[0024] Explanation of reference numerals in the attached drawings: Outer sheath 1; Corrugated copper tube 2; First flame-retardant filling layer 3; Outer flame-retardant layer 4; Wrapping layer 5; Second flame-retardant filling layer 6; Support frame 7; First shielding copper foil 7.1; Second shielding copper foil 7.2; Third shielding copper foil 7.3; First cable core 8; First conductor 8.1; First insulation layer 8.2; First inner flame-retardant layer 8.3; First inner sheath 8.4; Second cable core 9; Second conductor 9.1; Second insulation layer 9.2; Second inner flame-retardant layer 9.3; Second inner sheath 9.4; Third cable core 10; Third conductor 10.1; Third insulation layer 10.2; Third inner flame-retardant layer 10.3; Third inner sheath 10.4. Detailed Implementation

[0025] 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.

[0026] This utility model provides, for example Figure 1-4The illustrated B2 flame-retardant cable for special environments comprises, from the outside in, an outer sheath 1, a corrugated copper tube 2, a first flame-retardant filling layer 3, an outer flame-retardant layer 4, a wrapping layer 5, and a second flame-retardant filling layer 6. The outer sheath 1 is made of halogen-free, low-smoke, flame-retardant polyolefin; the first flame-retardant filling layer 3 is made of magnesium oxide powder; the wrapping layer 5 is made of halogen-free flame-retardant tape; and the second flame-retardant filling layer 6 is made of rock wool rope. The second flame-retardant filling layer 6 contains a support frame 7, multiple first cable cores 8, multiple second cable cores 9, and a third cable core 10. The support frame 7 has multiple first receiving slots capable of accommodating the first cable cores 8 and multiple second receiving slots capable of accommodating the second cable cores 9. The center of the support frame 7 has… There is a receiving through hole for installing the third cable core 10. The inner walls of the first receiving groove, the second receiving groove, and the receiving through hole are all provided with shielding copper foil. The first cable core 8 includes, from the inside to the outside, a first conductor 8.1, a first insulation layer 8.2, a first inner flame retardant layer 8.3, and a first inner sheath 8.4. The second cable core 9 includes, from the inside to the outside, a second conductor 9.1, a second insulation layer 9.2, a second inner flame retardant layer 9.3, and a second inner sheath 9.4. The third cable core 10 includes, from the inside to the outside, a third conductor 10.1, a third insulation layer 10.2, a third inner flame retardant layer 10.3, and a third inner sheath 10.4. The first, second, and third inner sheaths are all made of halogen-free, low-smoke, flame-retardant polyolefin sheaths.

[0027] The shielding copper foil is divided into a first shielding copper foil 7.1, a second shielding copper foil 7.2, and a third shielding copper foil 7.3. The first shielding copper foil 7.1 is located between the first receiving groove and the first cable core 8, the second shielding copper foil 7.2 is located between the second receiving groove and the second cable core 9, and the third shielding copper foil 7.3 is located between the receiving through hole and the third cable core 10. The cross-sections of the first and second shielding copper foils are both semi-circular, while the cross-section of the third shielding copper foil 7.3 is circular. The first insulation layer 8.2, the second insulation layer 9.2, and the third insulation layer 10.2 are all made of cross-linked polyethylene. The number of first cable cores 8 and second cable cores 9 are the same and they are alternately distributed. Multiple first cable cores 8 are distributed in a ring with equal spacing, and multiple second cable cores 9 are distributed in a ring with equal spacing.

[0028] Working Principle: The flame-retardant cable of this application features multiple cable cores to meet the needs of various application scenarios, thus broadening its application scope. It also has multiple flame-retardant layers, with the wrapping layer and inner and outer sheaths also made of flame-retardant materials, resulting in excellent flame-retardant performance. This allows the cable to slow the spread of fire and reduce the generation of harmful gases in the event of a fire. The supporting frame provides excellent overall cable support, and each cable core is individually housed in a corresponding receiving groove or through-hole, ensuring good protection for the cable core. Furthermore, shielding copper foil is installed in both the receiving groove and the receiving through-hole to reduce signal interference between the cable cores.

[0029] In the specific manufacturing process, firstly, shielding copper foil is installed on the inner walls of the receiving grooves and receiving through holes of the support frame. Next, the fabricated first, second, and third cable cores are installed into the receiving grooves or receiving through holes of the support frame, respectively. Then, halogen-free flame-retardant tape is used to wrap the support frame and each cable core together, and rock wool rope is filled into the gaps between the cable cores and the wrapping layer to improve the cable's flame-retardant performance. Next, an outer flame-retardant layer is fabricated outside the wrapping layer and placed inside a corrugated copper tube. Magnesium oxide powder is then filled into the gaps between the outer flame-retardant layer and the corrugated copper tube to further improve the cable's flame-retardant performance. The corrugated copper tube also enhances the cable's mechanical strength. Finally, an outer sheath is fabricated outside the corrugated copper tube. Since both the inner and outer sheaths are made of halogen-free, low-smoke, flame-retardant polyolefin, the cable's flame-retardant performance is greatly improved, effectively preventing the spread of flames and reducing the generation of harmful gases in the event of a fire.

[0030] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.

Claims

1. A B2 flame-retardant cable for special environments, characterized in that, From the outside in, the structure comprises an outer sheath, a corrugated copper tube, a first flame-retardant filling layer, an outer flame-retardant layer, a wrapping layer, and a second flame-retardant filling layer. The outer sheath is made of halogen-free, low-smoke, flame-retardant polyolefin. The first flame-retardant filling layer is made of magnesium oxide powder. The wrapping layer is made of halogen-free flame-retardant tape. The second flame-retardant filling layer is made of rock wool rope. The second flame-retardant filling layer contains a support frame, multiple first cable cores, multiple second cable cores, and one third cable core. The support frame has multiple first receiving slots capable of accommodating the first cable cores and multiple second receiving slots capable of accommodating the second cable cores. The center of the cable has a receiving through hole for installing the third cable core. The inner walls of the first receiving groove, the second receiving groove, and the receiving through hole are all provided with shielding copper foil. The first cable core, from the inside out, includes a first conductor, a first insulation layer, a first inner flame retardant layer, and a first inner sheath. The second cable core, from the inside out, includes a second conductor, a second insulation layer, a second inner flame retardant layer, and a second inner sheath. The third cable core, from the inside out, includes a third conductor, a third insulation layer, a third inner flame retardant layer, and a third inner sheath. The first, second, and third inner sheaths are all made of halogen-free, low-smoke, flame-retardant polyolefin sheaths.

2. The B2 flame-retardant cable for special environments according to claim 1, characterized in that, The shielding copper foil is divided into a first shielding copper foil, a second shielding copper foil and a third shielding copper foil. The first shielding copper foil is located between the first receiving groove and the first cable core, the second shielding copper foil is located between the second receiving groove and the second cable core, and the third shielding copper foil is located between the receiving through hole and the third cable core.

3. The B2 flame-retardant cable for special environments according to claim 2, characterized in that, The first and second shielding copper foils have semi-circular cross-sections, while the third shielding copper foil has a circular cross-section.

4. The B2 flame-retardant cable for special environments according to claim 1, characterized in that, The first, second, and third insulating layers are all made of cross-linked polyethylene.

5. The B2 flame-retardant cable for special environments according to claim 1, characterized in that, The number of the first cable core and the second cable core are the same and they are distributed alternately.

6. The B2 flame-retardant cable for special environments according to claim 5, characterized in that, Multiple first cable cores are distributed in a ring with equal spacing, and multiple second cable cores are distributed in a ring with equal spacing.

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