Aluminum alloy core for photovoltaic power generation and longitudinal water-blocking low-voltage cable thereof

Abstract

The invention discloses an aluminum alloy core for photovoltaic power generation and a longitudinal water-blocking low-voltage cable of the aluminum alloy core, and belongs to the technical field of cables, and the aluminum alloy core comprises the following chemical components in percentage by mass: 0.50-0.60% of iron, 0.04-0.06% of boron, 0.10% of silicon, 0.10-0.15% of copper, 0.01% of magnesium, 0.01-0.05% of zinc, 0.020-0.025% of cerium, 0.010-0.015% of lanthanum and the balance of aluminum and inevitable impurities. The cable core of the longitudinal water-blocking low-voltage cable further comprises an insulating layer wrapped outside the aluminum alloy core and a shielding layer wound outside the insulating layer, and the radial water-blocking cable further comprises an interlocking armor layer, an aluminum plastic bonding waterproof layer and a sheath layer which are wrapped outside the cable core from inside to outside. The cable has good tensile strength and elongation, low resistivity can be maintained, and due to the small outer diameter of the conductor, the cable production cost can be reduced, and the weight of materials for covering the materials in the previous process in the later process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to an aluminum alloy core for photovoltaic power generation and a longitudinal water-blocking low-voltage cable thereof. Background Art

[0002] Aluminum alloy conductors have been used in overhead lines since 1921. Due to their high strength, light weight, and good electrical conductivity (different brands of aluminum alloys have different performance characteristics), they are widely used and have achieved good economic results. After several equipment and process reforms, the performance of aluminum alloy conductors in my country has reached the standards of IEC, JEC, etc., and are used in overhead lines. However, due to various reasons, the use of aluminum alloy conductors in my country's power transmission and distribution lines currently accounts for only about 7%, while aluminum alloy conductors have long become the main type of wires for power transmission lines internationally. Among them, France is the most widely used. They use aluminum alloy stranded wires in plain areas and steel core aluminum alloy stranded wires in mountainous areas. At present, they have almost completely replaced steel core aluminum stranded wires. In Japan, heat-resistant aluminum alloys are widely used as the main type of conductive aluminum alloys. The heat-resistant aluminum alloy series conductors used by Japan's six major power companies account for more than 70% of the conductors used in Japan's overhead power transmission and distribution lines.

[0003] At present, most traditional power cables use round single-wire stranded conductors. The filling factor of the stranded conductor is 0.75, and the filling factor reaches 0.82-0.92 after compression. As a result, the outer diameter of the conductor is too large, which increases the amount of insulation, filling, armor and sheath materials, thereby increasing production costs and failing to achieve environmental protection. In addition, the tensile strength of aluminum alloy wires is low. If steel core is added to form steel core aluminum stranded wire, this will increase the weight of the wires and cables, increase the resistivity, and reduce the corrosion resistance, resulting in increased pole load, increased line loss, and shortened life. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an aluminum alloy core for photovoltaic power generation and a longitudinal water-blocking low-voltage cable thereof, which has good tensile strength and elongation, and can also maintain a low resistivity. Moreover, because the outer diameter of the conductor is small, it can be beneficial to reduce the cable production cost and reduce the weight of the materials used in the subsequent processes covering the previous processes.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] The present invention provides an aluminum alloy core for photovoltaic power generation, wherein the chemical composition mass ratio of the aluminum alloy core is as follows:

[0007] Iron 0.50-0.60%, boron 0.04-0.06%, silicon 0.10%, copper 0.10-0.15%, magnesium 0.01%, zinc 0.01-0.05%, cerium 0.020-0.025%, lanthanum 0.010-0.015%, and the balance is aluminum and inevitable impurities.

[0008] Preferably, the mass percentage of aluminum in the chemical composition of the aluminum alloy core is 99.06-99.11%.

[0009] Preferably, the chemical composition mass ratio of the aluminum alloy core is: 0.60% iron, 0.04% boron, 0.10% silicon, 0.15% copper, 0.01% magnesium, 0.01% zinc, 99.06% aluminum, 0.020% cerium, and 0.010% lanthanum.

[0010] Preferably, the aluminum alloy core is firstly melted and rolled into an aluminum alloy rod through aluminum ingot, and then the aluminum alloy rod is drawn into a special-shaped aluminum alloy single wire, and finally the special-shaped aluminum alloy single wire is twisted into a cable core conductor.

[0011] Preferably, the special-shaped aluminum alloy single wire is twisted into a circular structure through multiple strands of tight compression, and each layer is twisted in forward and reverse directions.

[0012] The present invention also provides a longitudinal water-blocking low-voltage cable for photovoltaic power generation, which uses the aforementioned aluminum alloy core for photovoltaic power generation as a conductor of the cable core, and the cable core also includes an insulating layer coated on the outside of the aluminum alloy core, and a shielding layer wrapped around the outside of the insulating layer;

[0013] The radial water-blocking cable also includes an interlocking armor layer, an aluminum-plastic bonding waterproof layer and a sheath layer which are coated outside the cable core from the inside to the outside.

[0014] Furthermore, the aluminum-plastic bonding waterproof layer is formed by bonding a longitudinally wrapped double-sided plastic-coated aluminum tape and a polyethylene outer sheath, the double-sided plastic-coated aluminum tape has a nominal thickness of at least 0.20 mm, and the bare aluminum tape has a nominal thickness of not less than 0.15 mm;

[0015] The double-sided plastic-coated aluminum tape is completely and longitudinally wrapped outside the cable core, the longitudinal overlapping width is not less than 6mm, and the longitudinal overlapping width is not less than 20% of the circumference of the longitudinally wrapped wire core.

[0016] Furthermore, the shielding layer is a double-layer composite structure of soft fine copper wire and soft copper tape.

[0017] The beneficial effects of the present invention are:

[0018] On the one hand, the aluminum alloy core of the present invention has good tensile strength, resistivity, etc., and has excellent performance. It uses special-shaped aluminum alloy single wires twisted into a cable core conductor with a smaller outer diameter, which is beneficial to reducing the cable production cost and reducing the amount of materials used in the subsequent processes to cover the previous processes.

[0019] On the other hand, the external materials of the cable in the present invention sequentially adopt a flame-retardant outer sheath layer, an aluminum-plastic adhesive waterproof layer and an interlocking armor layer, etc. The plastic-coated aluminum tape is completely longitudinally wrapped around the cable core, and the aluminum-plastic adhesive waterproof layer adopts a linear medium-density or high-density polyethylene sheath layer. The polyethylene sheath layer is firmly bonded to the plastic-coated aluminum tape to form a complete aluminum-plastic adhesive waterproof layer, thereby improving the waterproof performance of the cable; the interlocking armor layer structure is interlocked layer by layer without gaps, just like a metal barrel, the cable core is placed inside, and the outside water cannot enter the inner layer, thereby further enhancing the waterproof performance of the cable, and the interlocking armor layer can also play a role in preventing the cable from being buried underground and crushed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Figure numerals: 1. aluminum alloy core, 2. insulation layer, 3. shielding layer, 31. soft fine copper wire, 32. soft copper tape, 4. interlocking armor layer, 5. aluminum-plastic bonding waterproof layer, 6. sheath layer, 7. water-blocking yarn. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] Example 1

[0024] The invention provides an aluminum alloy core for photovoltaic power generation. The aluminum alloy core has the following chemical composition weight ratio: 0.60% iron, 0.04% boron, 0.10% silicon, 0.15% copper, 0.01% magnesium, 0.01% zinc, 99.06% aluminum, 0.020% cerium and 0.010% lanthanum.

[0025] In this embodiment, the aluminum alloy core is firstly melted and rolled into an aluminum alloy rod through aluminum ingot, and then the aluminum alloy rod is drawn into a special-shaped aluminum alloy single wire, and finally the special-shaped aluminum alloy single wire is twisted into a cable core conductor.

[0026] In this embodiment, the special-shaped aluminum alloy single wire is twisted into a circular structure through multiple strands, and each layer is twisted in the forward and reverse directions.

[0027] This embodiment also provides a longitudinal water-blocking low-voltage cable for photovoltaic power generation, which uses the aforementioned aluminum alloy core 1 for photovoltaic power generation as a conductor of the cable core, and the cable core also includes an insulating layer 2 coated on the outside of the aluminum alloy core 1, and a shielding layer 3 wrapped around the outside of the insulating layer 2;

[0028] The radial water-blocking cable further comprises an interlocking armor layer 4, an aluminum-plastic bonding waterproof layer 5 and a sheath layer 6 which are coated outside the cable core from the inside to the outside.

[0029] In this embodiment, the aluminum-plastic adhesive waterproof layer 5 is formed by bonding a longitudinally wrapped double-sided plastic-coated aluminum tape and a polyethylene outer sheath, wherein the nominal thickness of the double-sided plastic-coated aluminum tape is at least 0.20 mm, and the nominal thickness of the bare aluminum tape is not less than 0.15 mm;

[0030] The double-sided plastic-coated aluminum tape is completely and longitudinally wrapped outside the cable core, the longitudinal overlapping width is not less than 6mm, and the longitudinal overlapping width is not less than 20% of the circumference of the longitudinally wrapped wire core.

[0031] In this embodiment, the shielding layer 3 is a double-layer composite structure of soft thin copper wires 31 and soft copper tapes 32. Specifically, the shielding layer 3 is firstly wound around the insulating layer 2 with 0.51 mm soft thin copper wires 31, so that multiple soft thin copper wires 31 are wound at equal intervals, and then the soft copper tapes 32 are overlapped and spirally wrapped around the soft thin copper wires 31. The number of soft thin copper wires 31 is determined according to the shielding cross-sectional area, and the shielding cross-sectional area is determined according to the cable fault current.

[0032] In this embodiment, a water-blocking yarn 7 is filled between the cable core and the interlocking armor layer 4. The interlocking armor layers 4 are interlocked with each other without any gaps, and the cable core is installed inside.

[0033] The aluminum alloy rod material prepared based on the chemical composition mass ratio in the above-mentioned embodiment 1 has a resistivity of 0.028260Ω·mm 2 / m, tensile strength 155Mpa, elongation 10%;

[0034] The aluminum alloy rod is drawn into a single conductor wire with the following properties: tensile strength 125Mpa, elongation 14%, repeated bending times 30 times, yield strength 116N / mm 2 .

[0035] Example 2

[0036] The difference from the above-mentioned embodiment 1 is that, in this embodiment, the chemical composition mass ratio of the aluminum alloy core is: iron 0.55%, boron 0.06%, silicon 0.10%, copper 0.10%, magnesium 0.01%, zinc 0.03%, aluminum 99.11%, cerium 0.025%, and lanthanum 0.015%.

[0037] The aluminum alloy rod material prepared based on the chemical composition mass ratio in the above-mentioned embodiment 2 has a resistivity of 0.029160Ω·mm 2 / m, tensile strength 135Mpa, elongation 5%;

[0038] The aluminum alloy rod is drawn into a single conductor wire with the following properties: tensile strength 110Mpa, elongation 11%, repeated bending times 26 times, yield strength 102N / mm 2 .

[0039] Example 3

[0040] The difference from the above-mentioned embodiment 1 is that, in this embodiment, the chemical composition mass ratio of the aluminum alloy core is: iron 0.50%, boron 0.04%, silicon 0.10%, copper 0.15%, magnesium 0.01%, zinc 0.05%, aluminum 99.11%, cerium 0.025%, and lanthanum 0.015%.

[0041] The aluminum alloy rod material prepared based on the chemical composition mass ratio in the above-mentioned embodiment 3 has a resistivity of 0.029510Ω·mm 2 / m, tensile strength 125Mpa, elongation 3%;

[0042] The aluminum alloy rod is drawn into a single conductor wire with the following properties: tensile strength 105Mpa, elongation 8%, repeated bending times 20 times, yield strength 88N / mm 2 .

[0043] It is noteworthy that the present invention adopts a shaped aluminum alloy single wire drawn from an aluminum alloy rod, and then uses the shaped aluminum alloy single twisted to form an aluminum alloy core 1 conductor for a synthetic cable. With this process structure, the outer diameter of the conductor is smaller than that of the existing round aluminum alloy single wire conductor, which reduces the wire diameter of the finished cable, increases the bending radius of the cable, and facilitates the installation and laying of the cable.

[0044] It is more conducive to reducing the production cost of cables, because the conductor has a small outer diameter and a small circumference, which reduces the weight of materials used in the subsequent process to cover the previous process, such as the chemical cross-linking material used in the insulation layer 2, the soft fine copper wire 31 and the soft copper tape 32 used in the shielding layer 3, the interlocking armor layer 4 used in the armoring process, and the aluminum-plastic bonding waterproof layer 5 and the flame-retardant and wear-resistant sheath layer 6 used for subsequent water blocking. The reduction in material usage not only reduces the cost of cables, but also saves social resources, and at the same time achieves both economic and social benefits.

[0045] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. An aluminum alloy core for photovoltaic power generation, characterized in that: The chemical composition mass ratio of the aluminum alloy core is as follows: Iron 0.50-0.60%, boron 0.04-0.06%, silicon 0.10%, copper 0.10-0.15%, magnesium 0.01%, zinc 0.01-0.05%, cerium 0.020-0.025%, lanthanum 0.010-0.015%, and the balance is aluminum and inevitable impurities.

2. The aluminum alloy core for photovoltaic power generation according to claim 1, characterized in that: The mass percentage of aluminum in the chemical composition of the aluminum alloy core is 99.06-99.11%.

3. The aluminum alloy core for photovoltaic power generation according to claim 1 or 2, characterized in that: The aluminum alloy core has the following chemical composition ratios by mass: 0.60% iron, 0.04% boron, 0.10% silicon, 0.15% copper, 0.01% magnesium, 0.01% zinc, 99.06% aluminum, 0.020% cerium, and 0.010% lanthanum.

4. The aluminum alloy core for photovoltaic power generation according to claim 1, characterized in that: The aluminum alloy core is firstly melted and rolled into an aluminum alloy rod through aluminum ingot, and then the aluminum alloy rod is drawn into a special-shaped aluminum alloy single wire, and finally the special-shaped aluminum alloy single wire is twisted into a cable core conductor.

5. The aluminum alloy core for photovoltaic power generation according to claim 4, characterized in that: The special-shaped aluminum alloy single wire is twisted into a circular structure through multiple strands of tight compression, and each layer is twisted in the forward and reverse directions.

6. A longitudinal water-blocking low-voltage cable for photovoltaic power generation, using the aluminum alloy core for photovoltaic power generation according to claim 1 or 5 as the conductor of the cable core, characterized in that: The cable core also includes an insulating layer wrapped around the aluminum alloy core, and a shielding layer wrapped around the insulating layer; The radial water-blocking cable also includes an interlocking armor layer, an aluminum-plastic bonding waterproof layer and a sheath layer which are coated outside the cable core from the inside to the outside.

7. The longitudinal water-blocking low-voltage cable for photovoltaic power generation according to claim 6, characterized in that: The aluminum-plastic bonding waterproof layer is formed by bonding a longitudinally wrapped double-sided plastic-coated aluminum tape and a polyethylene outer sheath, wherein the nominal thickness of the double-sided plastic-coated aluminum tape is at least 0.20 mm, and the nominal thickness of the bare aluminum tape is not less than 0.15 mm; The double-sided plastic-coated aluminum tape is completely and longitudinally wrapped outside the cable core, the longitudinal overlapping width is not less than 6mm, and the longitudinal overlapping width is not less than 20% of the circumference of the longitudinally wrapped wire core.

8. The longitudinal water-blocking low-voltage cable for photovoltaic power generation according to claim 6, characterized in that: The shielding layer is a double-layer composite structure of soft thin copper wire and soft copper tape.

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