Flame-retardant environment-friendly polyolefin cable

Abstract

The utility model discloses a flame-retardant environment-friendly polyolefin cable, which relates to the field of cables, aims to solve the problems that an insulating layer is inconvenient to recycle and waterproof performance and bending performance cannot be realized at the same time in the prior art, and adopts the technical scheme that the flame-retardant environment-friendly polyolefin cable comprises a core material, the core material comprises a conductor, a mica tape is wrapped outside the conductor, and a halogen-free low-smoke tape is arranged outside the mica tape. A polypropylene insulating layer and a waterproof layer are sequentially arranged outside the halogen-free low-smoke belt; a flame-retardant material is arranged outside the core material, a flame-retardant oxygen barrier layer is arranged outside the core material and the flame-retardant material, an armoring material is arranged outside the flame-retardant oxygen barrier layer, and a second flame-retardant wrapping tape and an outer sheath are arranged outside the armoring material; the conductor is a stranded conductor, and a water-blocking tape and water-blocking yarn are arranged on the conductor. The thermoplastic polypropylene insulating layer is adopted, so that rapid recycling and reusing can be realized; the conductor adopts a stranded conductor, so that a core material with soft texture and good bending performance can be obtained; the water-blocking tape and the water-blocking yarn are added in the conductor, and the waterproof layer is additionally arranged, so that the waterproof effect of longitudinal waterproof and radial waterproof combination can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a flame-retardant and environment-friendly polyolefin cable. Background Technique

[0002] At present, the insulation of flame-retardant cables generally uses cross-linked polyethylene insulation. During the recycling process of the cable after retirement, due to its good thermosetting property, it is necessary to destroy its cross-linked structure for recycling, resulting in a very low actual recovery rate of cross-linked polyethylene.

[0003] Since the cable is used in water, it has high requirements for its waterproof performance. Although the existing longitudinally wrapped aluminum-plastic composite tape has good waterproof performance, its bending performance is poor. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a flame-retardant and environment-friendly polyolefin cable, which can effectively solve the problems in the background technique.

[0005] In order to achieve the above purpose, the utility model discloses a flame-retardant and environment-friendly polyolefin cable. The technical scheme adopted is as follows: it includes a core material. There is a flame-retardant tape and an armor material outside the core material, and an outer sheath is provided on the outermost layer. The core material includes a conductor located in the innermost layer. The conductor is wrapped with a mica tape, and a halogen-free low-smoke tape is provided outside the mica tape. The mica tape and the halogen-free low-smoke tape together form a flame-retardant and fire-resistant layer, and both adopt an overlapping winding form, and the overlapping rate of both is not less than 50%. An inner sheath is further provided outside the halogen-free low-smoke tape, and a waterproof layer is provided outside the inner sheath; there is a flame-retardant material outside the core material, a flame-retardant oxygen barrier layer is provided outside the core material and the flame-retardant material, the armor material is provided outside the flame-retardant oxygen barrier layer, a second flame-retardant tape and the outer sheath are provided outside the armor material, and the outer sheath is a flame-retardant, mouse-proof, ant-proof and ultraviolet-proof special low-smoke and halogen-free polyolefin sheath.

[0005]

[0006] As a preferred technical scheme of the utility model, the conductor is a fifth-class annealed tin-plated soft copper wire stranded conductor or a second-class stranded conductor, and a mica tape and a halogen-free low-smoke tape are wound outside the conductor. If the single wire diameter of the conductor ≤ 0.15mm, the conductor first adopts a bunching method, and multiple single wires are stranded together in the same stranding direction, and then multiple strands of ordinary stranded wires or bunched wires are stranded into a stranded wire in a regular stranding method. The conductor core stranded in this way has the characteristics of softness and good bending performance. If the conductor adopts the 5th type of soft conductor, bunching is carried out. Two single wires are allowed to be jointed, and the distance between the two single wire joints should be greater than 350mm, and integral bunch jointing is not allowed. When the conductor is bunching (non-compound stranding) for the first time, the single wire diameter of 0.3mm and below is allowed to adopt a twisting jointing method; there is also a water-blocking tape and water-blocking yarn on the conductor, and the water-blocking tape is an expansive longitudinal water-blocking and swelling tape.

[0007] As a preferred technical solution of the present utility model, there are three core materials, which are arranged in an annular array, and each core material is connected to its adjacent core material; all three core materials are connected to the flame-retardant oxygen barrier layer.

[0008] As a preferred technical solution of the present utility model, the flame-retardant oxygen barrier layer is a first flame-retardant tape, and the first flame-retardant tape is wound in a double layer with a lapping rate of ≥50%. The flame-retardant material is filled in the part within the first flame-retardant tape and outside the core material.

[0009] As a preferred technical solution of the present utility model, the waterproof layer of the core material is a nylon waterproof layer. The water-blocking tape plays a good role in longitudinal waterproofing, and nylon can play a role in radial water blocking. The combined waterproof structure of radial waterproofing and longitudinal waterproofing enables the cable to be used even when immersed in water for a long time without having a great impact on its electrical performance.

[0010] As a preferred technical solution of the present utility model, the armor material further includes a magnetic armor material and a non-magnetic armor material. The magnetic armor material is located inside and is connected to the flame-retardant oxygen barrier layer. The non-magnetic armor material is located outside and is connected to the second flame-retardant tape. The winding method of the armor material is gap lapping winding. The non-magnetic armor material is an aluminum tape or a stainless steel tape, and the magnetic armor material is a galvanized steel tape. The second flame-retardant tape is a low-smoke and halogen-free tape or a fiberglass tape, and is overlapped and wound at least 2 layers or more.

[0011] As a preferred technical solution of the present utility model, the correspondence between the thickness of the polypropylene insulation layer and the cross-sectional area of the conductor is as follows:

[0012]

[0013]

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: By adopting the polypropylene insulation layer in the present utility model, since polypropylene has good thermoplasticity, after the cable is retired, the polypropylene insulation layer can be quickly recycled and reused, which is beneficial to improving the recovery rate of the insulation layer of the retired cable; the conductor adopts a stranded conductor, and a core material with a soft texture and good bending performance can be obtained. Further, by adding a water-blocking tape and water-blocking yarns to the conductor, an excellent longitudinal waterproof effect can be achieved, and the external waterproof layer can achieve a radial water-blocking effect. Through the combined structure of the water-blocking tape, water-blocking yarns and the waterproof layer, the waterproof effect of the combination of longitudinal waterproofing and radial water blocking is achieved, and even if the cable is immersed in water for a long time, the normal operation of the cable can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present utility model.

[0016] In the figure: 1. Conductor; 2. Mica tape; 3. Halogen-free and low-smoke tape; 4. Polypropylene insulation layer; 5. Nylon waterproof layer; 6. Flame-retardant material; 7. First flame-retardant tape; 8. Armoring material; 801. Magnetic armoring material; 802. Non-magnetic armoring material; 9. Second flame-retardant tape; 10. Outer sheath. Specific embodiments

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1

[0019] As Figure 1 shown, the first embodiment of the present invention is disclosed in this embodiment. The technical solution adopted is that it includes three core materials arranged in a circular array. The main body of the core material is the conductor 1. In order to obtain the bending performance of the material number, the conductor 1 is a fifth-class annealed tinned soft copper wire stranded conductor with a cross-sectional area of 150 mm 2 , and it is coated with a flame-retardant and fire-resistant layer. The flame-retardant and fire-resistant layer is composed of the mica tape 2 and the halogen-free and low-smoke tape 3. The mica tape 2 is overlapped and wound around the conductor 1 with a lapping rate of 50%, and the halogen-free and low-smoke tape 3 is overlapped and wound on the mica tape 2 with a lapping rate of 50%. The halogen-free and low-smoke tape 3 is coated with a 1.2-mm-thick polypropylene insulation layer 4. In order to meet the higher waterproof requirements for underwater use, an expandable longitudinal water-blocking tape and water-blocking yarn are added during the stranding process of the conductor 1, thereby achieving longitudinal waterproofing. Further, a nylon waterproof layer 5 is extruded outside the polypropylene insulation layer 4 to achieve a radial water-blocking effect. Excellent waterproof performance is obtained through the combination of longitudinal and radial water-blocking barriers, and good electrical performance can be ensured even after long-term immersion in water.

[0020] In order to meet the flame-retardant requirements, the gaps between the three core materials are filled with the flame-retardant material 6. Outside the flame-retardant material 6, the first flame-retardant tape 7 is wound in a double-layer winding manner with a lapping rate of 50%. The first flame-retardant tape 7 is a fiberglass tape. In order to improve the mechanical properties of the cable, the magnetic armoring material 801 and the non-magnetic armoring material 802 of the armoring material 8 are wound in an overlapping and lapping manner outside the first flame-retardant tape 7. The magnetic armoring material 801 is made of galvanized steel strip and is in contact with the first flame-retardant tape 7. The non-magnetic armoring material 802 uses an aluminum strip and is wound outside the galvanized steel strip. In order to further improve the flame-retardant performance, a double-layer low-smoke and halogen-free tape is wound outside the aluminum strip with a lapping rate of 50% as the second flame-retardant tape 9.

[0021] In order to achieve the effects of flame retardancy, rodent prevention, ant prevention, and ultraviolet resistance, a B1-class low-smoke and halogen-free polyolefin sheath is sleeved outside the second flame retardant tape 9 as the outer sheath 10.

[0022] According to the standard requirements of the cross-linked polyethylene (XLPE) insulation layer, for a conductor 1 with a cross-sectional area of 150 mm 2 The thickness of the insulation layer used should not be less than 1.8 mm. Therefore, taking the standard requirements of the XLPE insulation layer as the comparison item, a performance test was conducted on the polypropylene insulation layer 4 with a thickness of 1.2 mm, and the results are as follows:

[0023] Non-electrical performance test

[0024]

[0025] Electrical performance test

[0026]

[0027] From the above comparison, it can be seen that the polypropylene insulation layer with a thickness of 1.2 mm meets the requirements in both electrical and non-electrical performances; for medium and high voltage wire and cable insulation thickness, it is generally calculated separately for the insulation thickness under long-term power frequency voltage and impulse voltage, and the larger thickness is taken as the basis for the insulation thickness. However, the insulation thickness calculated by the above method for low voltage cables is generally below 0.15 mm. Therefore, the insulation thickness of low voltage wire and cable is mainly determined according to its mechanical properties. Because if considered according to its working voltage, its insulation thickness can be thinner, but during the manufacturing, installation, laying, or use process of the product, the insulation layer of the product will be subjected to mechanical stresses such as tension, compression, bending, torsion, and shear. Therefore, although the test results for thicknesses of 1.0 mm and 0.9 mm are also non-breakdown, during the installation, laying, and use processes, the thinner thickness has a poor effect on anti-bending and anti-wear, while at a thickness of 1.2 mm, it can meet the requirements of production, installation, and use, and a thickness greater than 1.2 mm will only increase costs. Therefore, a thickness of 1.2 mm is the best choice.

[0028] Example 2

[0029] The difference between this example and Example 1 is that the cross-sectional area of the conductor 1 is 35 mm 2 , and the thickness of the polypropylene insulation layer 4 is 0.7 mm. A performance test was conducted on the polypropylene insulation layer 4 with a thickness of 0.7 mm, and the results are as follows:

[0030] Non-electrical performance test

[0031]

[0032]

[0033] Electrical performance test

[0034]

[0035] From the above comparison, it can be seen that the 0.7-mm-thick polypropylene insulation layer meets the requirements in both electrical and non-electrical properties. Considering the requirements of production, installation, use, and cost, a thickness of 0.7 mm is the best choice.

[0036] Example 3

[0037] The difference between this example and Example 1 is that the cross-sectional area of conductor 1 is 300 mm 2 , and the thickness of the polypropylene insulation layer 4 is 1.6 mm. Performance tests were conducted on the 1.6-mm-thick polypropylene insulation layer 4, and the results are as follows:

[0038] Non-electrical performance test

[0039]

[0040]

[0041] Electrical performance test

[0042]

[0043] From the above comparison, it can be seen that the 1.6-mm-thick polypropylene insulation layer meets the requirements in both electrical and non-electrical properties. Considering the requirements of production, installation, use, and cost, a thickness of 1.6 mm is the best choice.

[0044] Example 4

[0045] The difference between this example and Example 1 is that the cross-sectional area of conductor 1 is 16 mm 2 , and the thickness of the polypropylene insulation layer 4 is 0.5 mm.

[0046] Example 5

[0047] The difference between this example and Example 1 is that the cross-sectional area of conductor 1 is 50 mm 2 , and the thickness of the polypropylene insulation layer 4 is 0.8 mm.

[0048] Example 6

[0049] The difference between this example and Example 1 is that the cross-sectional area of conductor 1 is 70 mm 2 , and the thickness of the polypropylene insulation layer 4 is 1.0 mm.

[0050] Example 7

[0051] The difference between this example and Example 1 is that the cross-sectional area of conductor 1 is 120 mm 2, the thickness of the polypropylene insulating layer 4 is 1.0 mm.

[0052] Example 8

[0053] The difference between this example and Example 1 is that the cross-sectional area of the conductor 1 is 185 mm 2 , and the thickness of the polypropylene insulating layer 4 is 1.4 mm.

[0054] Example 9

[0055] The difference between this example and Example 1 is that the cross-sectional area of the conductor 1 is 240 mm 2 , and the thickness of the polypropylene insulating layer 4 is 1.5 mm.

[0056] The connection method involved in the present utility model is a conventional means adopted by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, which belongs to common general knowledge.

[0057] The components not described in detail in this article are prior art.

[0058] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A flame-retardant and environment-friendly polyolefin cable, comprising a core material, a flame-retardant tape and an armor material (8) on the outside of the core material, and an outer sheath (10) on the outermost layer, characterized in that: The core material comprises a conductor (1) located in the innermost layer, the conductor (1) is wrapped with a mica tape (2), the mica tape (2) is provided with a halogen-free low-smoke tape (3), the mica tape (2) and the halogen-free low-smoke tape (3) together form a flame retardant and fire resistant layer, and the halogen-free low-smoke tape (3) is provided with a polypropylene insulation layer (4) and a waterproof layer in sequence; the core material is provided with a flame retardant material (6), the core material and the flame retardant material (6) are provided with a flame retardant oxygen-isolating layer, the flame retardant oxygen-isolating layer is provided with the armor material (8), and the armor material (8) is provided with a second flame retardant wrapping tape (9) and the outer sheath (10); the conductor (1) is a stranded conductor, and the conductor (1) is provided with a water-blocking tape and a water-blocking yarn.

2. The flame-retardant and environment-friendly polyolefin cable according to claim 1, characterized in that: There are three core materials, which are arranged in a ring array, and each core material is connected to the adjacent core material; the three core materials are all connected to the flame retardant oxygen insulation layer.

3. The flame-retardant and environment-friendly polyolefin cable according to claim 2, characterized in that: The flame retardant oxygen-isolating layer is a first flame retardant wrapping tape (7), and the flame retardant material (6) is filled inside the first flame retardant wrapping tape (7) and outside the core material.

4. The flame-retardant and environment-friendly polyolefin cable according to claim 1, characterized in that: The waterproof layer of the core material is a nylon waterproof layer (5).

5. The flame-retardant and environment-friendly polyolefin cable according to claim 1, characterized in that: The armor material (8) further comprises a magnetic armor material (801) and a non-magnetic armor material (802), wherein the magnetic armor material (801) is located on the inner side and is connected to the flame-retardant oxygen-isolating layer, and the non-magnetic armor material (802) is located on the outer side and is connected to the second flame-retardant wrapping tape (9).

6. The flame-retardant and environment-friendly polyolefin cable according to claim 1, characterized in that: For the conductors (1) of different cross-sectional areas, the polypropylene insulation layer (4) used has different thicknesses, and the corresponding relationship between the thickness of the polypropylene insulation layer (4) and the cross-sectional area of ​​the conductor (1) is as follows: The cross-sectional area of ​​the conductor (1) is 1.5-16 mm 2 When the thickness of the polypropylene insulation layer (4) is 0.5 mm; The cross-sectional area of ​​the conductor (1) is 25-35 mm 2 When the thickness of the polypropylene insulating layer (4) is 0.7 mm; The cross-sectional area of ​​the conductor (1) is 50 mm 2 When the thickness of the polypropylene insulating layer (4) is 0.8 mm; The cross-sectional area of ​​the conductor (1) is 70-95 mm 2 When the thickness of the polypropylene insulation layer (4) is 1.0 mm; The cross-sectional area of ​​the conductor (1) is 120 mm 2 When the thickness of the polypropylene insulation layer (4) is 1.0 mm; The cross-sectional area of ​​the conductor (1) is 150 mm 2 When the thickness of the polypropylene insulating layer (4) is 1.2 mm; The cross-sectional area of ​​the conductor (1) is 185 mm 2 When the thickness of the polypropylene insulating layer (4) is 1.4 mm; The cross-sectional area of ​​the conductor (1) is 240 mm 2 When the thickness of the polypropylene insulating layer (4) is 1.5 mm; The cross-sectional area of ​​the conductor (1) is 300 mm 2 When the thickness of the polypropylene insulation layer (4) is 1.6 mm.

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