Deflection-resistant armored multi-core photovoltaic cable

Abstract

The utility model discloses a bending-resistant armored multi-core photovoltaic cable, which comprises a cable core formed by concentrically twisting seven insulating wire cores, and an irradiation crosslinking high-density polyethylene extruded inner sheath layer, a copper net braided armored layer and an irradiation crosslinking high-density polyethylene extruded outer sheath layer are sequentially coated outside the cable core, each insulating wire core comprises a stainless steel monofilament inner core, and the stainless steel monofilament inner core is sequentially coated with a first tinned copper mesh conductor layer, a second tinned copper mesh conductor layer, a third tinned copper mesh conductor layer, a para-position type wholly aromatic copolyamide stretched fiber separation net and an irradiation crosslinking low-density polyethylene insulating layer. The photovoltaic cable has better flexibility and flexibility resistance, wires and wires are not easy to break, the armored structure is added to improve the slight impact resistance, and the laying and mounting adaptability in a complex environment is enhanced.

Description

Technical Field

[0001] The present application belongs to the field of cable technology, and in particular, relates to a flex-resistant armored multi-core photovoltaic cable. Background Art

[0002] With the rapid development of the clean energy photovoltaic power generation industry, photovoltaic power generation technology is increasingly being promoted. Photovoltaic cables are an indispensable component in photovoltaic power generation systems. The main types of cables in photovoltaic power generation systems are photovoltaic special cables, power cables, control cables, communication cables and radio frequency cables. Communication cables are generally suitable for alarm, security, computer and automation connections, which have high requirements for anti-interference. During the installation and construction process, the allowable bending radius is small, and the cable needs to have good flexibility and flex resistance, and is not easy to break when wiring in a narrow space. The cable industry is developing in the direction of thin diameter and flexibility, and has put forward higher requirements for multi-core photovoltaic cables. On the basis of ensuring mechanical strength, it is committed to improving the flexibility and flex resistance of multi-core cables, improving the resistance to slight impact, enhancing the adaptability of laying and installation, reducing the difficulty of installation technology, and ensuring the safe and reliable operation of photovoltaic power generation systems. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a flex-resistant armored multi-core photovoltaic cable with better flexibility and flex resistance, less prone to wire breakage, an increased armor structure to improve resistance to slight impacts, and enhanced adaptability to laying and installation in complex environments.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] The flex-resistant armored multi-core photovoltaic cable comprises seven insulated cores twisted concentrically to form a cable core, the outside of the cable core is coated with an irradiation cross-linked high-density polyethylene extruded inner sheath layer, a copper mesh braided armor layer and an irradiation cross-linked high-density polyethylene extruded outer sheath layer in sequence, the insulated core comprises a stainless steel monofilament inner core, the outside of the stainless steel monofilament inner core is coated with a first tinned copper mesh conductor layer, a second tinned copper mesh conductor layer, a third tinned copper mesh conductor layer, a para-type fully aromatic copolyamide stretched fiber isolation net and an irradiation cross-linked low-density polyethylene insulation layer in sequence, the first tinned copper mesh conductor layer, the second tinned copper mesh conductor layer and the third tinned copper mesh conductor layer are respectively woven and pressed by a first tinned copper wire, a second tinned copper wire and a third tinned copper wire with successively increasing wire diameters, and the braiding density decreases successively.

[0006] Preferably, the first tinned copper wire has a wire diameter of 0.01 mm to 0.05 mm, the second tinned copper wire has a wire diameter of 0.04 mm to 0.08 mm, and the third tinned copper wire has a wire diameter of 0.08 mm to 0.15 mm.

[0007] Preferably, the weaving density of the first tinned copper mesh conductor layer is not less than 95%, the weaving density of the second tinned copper mesh conductor layer is 92% to 95%, and the weaving density of the third tinned copper mesh conductor layer is 90% to 92%.

[0008] Preferably, the thicknesses of the first tinned copper mesh conductor layer, the second tinned copper mesh conductor layer and the third tinned copper mesh conductor layer decrease in sequence.

[0009] Preferably, the para-type wholly aromatic copolyamide stretched fiber isolation net is an inner and outer double-layer para-type wholly aromatic copolyamide stretched fiber twisted wire flat woven net structure with a weaving density of not less than 98%.

[0010] Preferably, the inner layer of the para-type wholly aromatic copolyamide stretched fiber strands plain woven mesh is a plain woven mesh structure woven from fine para-type wholly aromatic copolyamide stretched fiber strands, and the outer layer of the para-type wholly aromatic copolyamide stretched fiber strands plain woven mesh is a plain woven mesh structure woven from coarse para-type wholly aromatic copolyamide stretched fiber strands, and the diameter of the coarse para-type wholly aromatic copolyamide stretched fiber strands is 3 to 5 times the diameter of the fine para-type wholly aromatic copolyamide stretched fiber strands.

[0011] Preferably, the para-type wholly aromatic copolyamide stretched fiber isolation web has a thickness not exceeding 0.05 mm.

[0012] Preferably, the copper mesh braided armor layer is formed by mutually counter-rotating spirally winding and braiding of para-type wholly aromatic copolyamide stretched fiber strands and tinned copper wire mixed wires, and the braiding density is not less than 90%.

[0013] Preferably, the diameter of the para-type wholly aromatic copolyamide stretched fiber strand is not less than 75% of the diameter of the tinned copper wire.

[0014] Preferably, the lay length of the cable core is 10 to 20 times the outer diameter of the insulating core.

[0015] Beneficial effects of this application:

[0016] 1. The inner conductor of the insulated wire core adopts a stainless steel monofilament inner core and is tightly covered with the first, second and third tinned copper mesh conductor layers in sequence. The inner conductor has good flexibility, and the tightly pressed laminated mesh structure of the tinned copper mesh will not loosen and has better flexural resistance. The diameter of each layer of tinned copper wire increases successively and the braiding density decreases successively, which helps to reduce torque, improve flexural resistance, enhance flexibility, and is not easy to break the wire, thereby enhancing the adaptability of laying and installation in complex environments.

[0017] 2. By adding a para-type fully aromatic copolyamide stretched fiber isolation mesh between the tinned copper mesh conductor layer and the insulating layer, it helps to prevent the insulating layer from penetrating into the tinned copper wires and causing adhesion, which is beneficial to improving the axial extension performance of the wire core, improving the overall flexibility and flex resistance of the cable, and the cable has a smaller natural bending radius, enhancing the adaptability of laying and installation in complex environments.

[0018] 3. By adding a copper mesh woven armor layer between the inner and outer sheath layers of the irradiated cross-linked high-density polyethylene extrusion, additional mechanical protection is provided, and it has a certain resistance to slight impact. It is formed by weaving a para-type fully aromatic copolyamide stretched fiber strand and a tinned copper wire mixed wire. The para-type fully aromatic copolyamide stretched fiber strand helps to improve the flexibility of the armor layer, reduce the local stress concentration of the armor layer, reduce the torque during bending, protect the sheath layer, increase safety and reliability, and enhance the adaptability of laying and installation in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 1-insulated wire core, 2-irradiation cross-linked high-density polyethylene extruded inner sheath layer, 3-copper mesh braided armor layer, 4-irradiation cross-linked high-density polyethylene extruded outer sheath layer, 5-stainless steel monofilament inner core, 6-first layer of tinned copper mesh conductor layer, 7-second layer of tinned copper mesh conductor layer, 8-third layer of tinned copper mesh conductor layer, 9-para-type fully aromatic copolyamide stretched fiber isolation net, 10-irradiation cross-linked low-density polyethylene insulation layer. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0023] See also Figure 1The flex-resistant armored multi-core photovoltaic cable of the embodiment of the present application includes seven insulating cores 1 concentrically twisted to form a cable core, and the twist pitch of the cable core is 10 to 20 times the outer diameter of the insulating core 1. The insulated wire core 1 includes a stainless steel monofilament inner core 5, the outer portion of which is sequentially coated with a first tinned copper mesh conductor layer 6, a second tinned copper mesh conductor layer 7, a third tinned copper mesh conductor layer 8, a para-type fully aromatic copolyamide stretched fiber isolation mesh 9 and an irradiated cross-linked low-density polyethylene insulation layer 10. The first tinned copper mesh conductor layer 6, the second tinned copper mesh conductor layer 7 and the third tinned copper mesh conductor layer 8 are respectively woven and pressed by first tinned copper wires, second tinned copper wires and third tinned copper wires with successively increasing wire diameters and the weaving density decreases successively. Specifically, the first tinned copper wire has a wire diameter of 0.01 mm to 0.05 mm, the second tinned copper wire has a wire diameter of 0.04 mm to 0.08 mm and the third tinned copper wire has a wire diameter of 0.08 mm to 0.15 mm. The weaving density of the first tinned copper mesh conductor layer 6 is not less than 95%, the weaving density of the second tinned copper mesh conductor layer 7 is 92% to 95%, and the weaving density of the third tinned copper mesh conductor layer 8 is 90% to 92%. Furthermore, the thicknesses of the first tinned copper mesh conductor layer 6, the second tinned copper mesh conductor layer 7 and the third tinned copper mesh conductor layer 8 decrease in sequence. In one embodiment, the para-type wholly aromatic copolyamide stretched fiber isolation net 9 is an inner and outer double-layer para-type wholly aromatic copolyamide stretched fiber stranded wire flat woven net structure with a weaving density of not less than 98%. Further, the inner layer of the para-type wholly aromatic copolyamide stretched fiber stranded wire flat woven net is a flat woven net structure woven from fine para-type wholly aromatic copolyamide stretched fiber stranded wires, and the outer layer of the para-type wholly aromatic copolyamide stretched fiber stranded wire flat woven net is a coarse para-type wholly aromatic copolyamide stretched fiber stranded wire woven to form a flat woven net structure, and the diameter of the coarse para-type wholly aromatic copolyamide stretched fiber stranded wire is 3 to 5 times the diameter of the fine para-type wholly aromatic copolyamide stretched fiber stranded wire. The thickness of the para-type wholly aromatic copolyamide stretched fiber isolation net 9 does not exceed 0.05 mm.

[0024] The cable core is coated with an irradiated cross-linked high-density polyethylene extruded inner sheath layer 2, a copper mesh braided armor layer 3 and an irradiated cross-linked high-density polyethylene extruded outer sheath layer 4 in sequence. In one embodiment, the copper mesh braided armor layer 3 is composed of para-type wholly aromatic copolyamide stretched fiber strands and tinned copper wire mixed wires that are mutually reversely spirally wound and braided with a braiding density of not less than 90%, and further, the diameter of the para-type wholly aromatic copolyamide stretched fiber strands is not less than 75% of the diameter of the tinned copper wire.

[0025] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. Flexibility-resistant armored multi-core photovoltaic cable, characterized by: The invention comprises seven insulated wire cores (1) which are coaxially twisted to form a cable core. The cable core is coated with an irradiated cross-linked high-density polyethylene extruded inner sheath layer (2), a copper mesh braided armor layer (3) and an irradiated cross-linked high-density polyethylene extruded outer sheath layer (4) in sequence. The insulated wire core (1) comprises a stainless steel monofilament inner core (5). The stainless steel monofilament inner core (5) is coated with a first tinned copper mesh conductor layer (6), a second tinned copper mesh conductor layer (7), a third tinned copper mesh conductor layer (8), a para-type fully aromatic copolyamide stretched fiber isolation net (9) and an irradiated cross-linked low-density polyethylene insulation layer (10) in sequence. The first tinned copper mesh conductor layer (6), the second tinned copper mesh conductor layer (7) and the third tinned copper mesh conductor layer (8) are respectively braided and pressed by first tinned copper wires, second tinned copper wires and third tinned copper wires with increasing wire diameters, and the braiding density decreases in sequence.

2. The flex-resistant armored multi-core photovoltaic cable according to claim 1, characterized in that: The diameter of the first tinned copper wire is 0.01 mm to 0.05 mm, the diameter of the second tinned copper wire is 0.04 mm to 0.08 mm, and the diameter of the third tinned copper wire is 0.08 mm to 0.15 mm.

3. The flex-resistant armored multi-core photovoltaic cable according to claim 1, characterized in that: The weaving density of the first tinned copper mesh conductor layer (6) is not less than 95%, the weaving density of the second tinned copper mesh conductor layer (7) is 92% to 95%, and the weaving density of the third tinned copper mesh conductor layer (8) is 90% to 92%.

4. The flex-resistant armored multi-core photovoltaic cable according to claim 1, characterized in that: The thicknesses of the first tinned copper mesh conductor layer (6), the second tinned copper mesh conductor layer (7) and the third tinned copper mesh conductor layer (8) decrease in sequence.

5. The flex-resistant armored multi-core photovoltaic cable according to claim 1, characterized in that: The para-type fully aromatic copolyamide stretched fiber isolation net (9) is an inner and outer double-layer para-type fully aromatic copolyamide stretched fiber twisted wire flat woven net structure with a weaving density of not less than 98%.

6. The flex-resistant armored multi-core photovoltaic cable according to claim 5, characterized in that: The inner layer of the para-type wholly aromatic copolyamide stretched fiber strands plain woven mesh is a flat woven mesh structure woven from fine para-type wholly aromatic copolyamide stretched fiber strands, and the outer layer of the para-type wholly aromatic copolyamide stretched fiber strands plain woven mesh is a flat woven mesh structure woven from coarse para-type wholly aromatic copolyamide stretched fiber strands, and the diameter of the coarse para-type wholly aromatic copolyamide stretched fiber strands is 3 to 5 times the diameter of the fine para-type wholly aromatic copolyamide stretched fiber strands.

7. The flex-resistant armored multi-core photovoltaic cable according to claim 1, characterized in that: The thickness of the para-type wholly aromatic copolyamide stretched fiber isolation net (9) does not exceed 0.05 mm.

8. The flex-resistant armored multi-core photovoltaic cable according to claim 1, characterized in that: The copper mesh braided armor layer (3) is formed by mutually counter-rotating spirally wound braided para-type fully aromatic copolyamide stretched fiber strands and tinned copper wire mixed wires, and the braiding density is not less than 90%.

9. The flex-resistant armored multi-core photovoltaic cable according to claim 8, characterized in that: The diameter of the para-type wholly aromatic copolyamide stretched fiber strand is not less than 75% of the diameter of the tinned copper wire.

10. The flex-resistant armored multi-core photovoltaic cable according to claim 1, characterized in that: The lay length of the cable core is 10 to 20 times the outer diameter of the insulating core (1).

Images