Low-smoke halogen-free flame-retardant photovoltaic cable
By adopting a multi-layer twisted structure and a specific material combination in the photovoltaic cable conductor, the problem of the conductor being difficult to insert into the connector after stripping the insulation layer is solved, achieving a quick and convenient connection process and improved cable performance.
Patent Information
- Application Number
- CN202422419923.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-10-08
AI Technical Summary
After the insulation layer of the photovoltaic cable conductor is stripped, the metal wire is easy to bend and difficult to directly insert into the integrated connector, making the connection process inconvenient.
The conductor adopts a multi-layer twisted structure, including a first structural layer and a second structural layer. The diameter of the metal wire in the second structural layer is larger than that in the first structural layer. The diameter of the outer monofilament is 2 to 3 times that of the inner monofilament. Tinned copper wire is used to increase mechanical strength. Water-blocking yarn is provided to improve tensile strength and waterproofness. The insulation layer uses cross-linked polyolefin material, and the sheath layer is made of low-smoke halogen-free flame-retardant polyolefin material.
The conductors are not easy to disperse after the insulation layer is stripped off and are easy to insert into the one-piece connector. The connection process is quick and convenient, which improves the flexibility and tensile strength of the cable, extends its service life and reduces the toxicity of smoke.
Smart Images
Figure CN223347526U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wires and cables, in particular to a low-smoke, halogen-free and flame-retardant photovoltaic cable. Background Art
[0002] Photovoltaic cables are key components for power transmission on the DC side of solar photovoltaic power station systems. The conductors of photovoltaic cables are usually made of pure copper or tinned copper, which has excellent electrical conductivity and mechanical properties. High-quality insulation materials such as XLPE (cross-linked polyethylene) and polyvinyl chloride are used to prevent the cables from corrosion and aging in outdoor environments. Combined with the high-temperature and low-temperature resistance and radiation protection of the cable sheath, they protect the cables from long-term stable operation in outdoor environments.
[0003] Photovoltaic cables are connected to photovoltaic panels and junction boxes by stripping the cables and then connecting to the connectors. Currently, the connection terminals in the connectors are split and integrated. The integrated type is more convenient to connect than the split type and has higher waterproof capabilities. The split type requires the user to connect the crimping terminal to the end of the cable first when connecting, while the integrated type can be directly inserted when connecting. The conductor structure of the cable currently uses Category V twisted conductors. After stripping the insulation, the outer copper wire is easy to bend and difficult to directly insert into the integrated connector. Utility Model Content
[0004] In view of the technical problems existing in the photovoltaic cables of the prior art, the first aspect of the present invention provides a low-smoke, halogen-free and flame-retardant photovoltaic cable, comprising a conductor, an insulation layer and a sheath layer distributed from the inside to the outside, wherein the conductor comprises a multi-layer twisted structure;
[0005] The conductor includes a first structural layer and a second structural layer, the second structural layer is located on the outer layer of the first structural layer, the first structural layer includes a metal wire bundle twisted structure, and the second structural layer includes a single or double layer of metal wires twisted on the outer layer of the first structural layer;
[0006] The first structural layer includes a plurality of first monofilaments, and the second structural layer includes a plurality of second monofilaments. The diameter of the second monofilaments is greater than that of the first monofilaments.
[0007] Preferably, the second monofilament comprises a tinned copper wire.
[0008] Preferably, the diameter of the second monofilament is 2 to 3 times the diameter of the first monofilament.
[0009] Preferably, the maximum diameter of the second monofilament is 1.2 mm.
[0010] Preferably, the first structural layer includes a three-layer twisted structure of 1+6+12, the first layer twisted structure includes one bundle of metal wires, the second layer twisted structure includes 6 bundles of metal wires, and the third layer twisted structure includes 12 bundles of metal wires.
[0011] Preferably, the metal wire bundle is configured as a 1+6 tinned copper wire twisted structure.
[0012] Preferably, the metal wire bundles of the first layer twisted structure include a stainless steel twisted structure, and the metal wire bundles of the second layer twisted structure and the third layer twisted structure include a tinned copper wire twisted structure.
[0013] Preferably, a water-blocking yarn is provided in the gap between the first structural layer and the second structural layer.
[0014] Preferably, the insulating layer comprises a cross-linked polyolefin insulating layer.
[0015] Preferably, the sheath layer comprises a low-smoke, halogen-free, flame-retardant polyolefin sheath layer.
[0016] Compared with the existing technology, the low-smoke, halogen-free, flame-retardant photovoltaic cable of the present invention has the following significant advantages:
[0017] The conductor of the photovoltaic cable proposed by the present invention is arranged to include a first structural layer and a second structural layer. The second structural layer is on the outside of the first structural layer. The second structural layer is composed of metal wires with a thicker diameter. The first structural layer is formed by twisting metal wire bundles with a thinner diameter. While maintaining the good flexibility of the cable, the outer layer of the conductor is not easy to deform, especially after stripping the insulation layer, the metal wires are not easy to disperse, so that the conductor of the photovoltaic cable can be more easily inserted directly into the connection hole of the integrated connector when the connector is connected, realizing an integrated connection with the connector, and the wiring process is faster and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings.
[0019] Figure 1 It is a structural schematic diagram of the low-smoke, halogen-free and flame-retardant photovoltaic cable shown in the present invention.
[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of the low-smoke, halogen-free and flame-retardant photovoltaic cable shown in the present invention. DETAILED DESCRIPTION
[0021] In order to better understand the technical content of the present invention, specific embodiments are given and described below with reference to the accompanying drawings.
[0022] like Figure 1 and Figure 2 As shown, the low-smoke, halogen-free, flame-retardant photovoltaic cable proposed in the first aspect of the present invention includes a conductor 10, an insulation layer 20, and a sheath layer 30 arranged from the inside out. Since the photovoltaic cable needs to be bent to the required angles when connecting connectors and routing between photovoltaic panels, the conductor 10 adopts a multi-layer twisted structure to ensure good flexibility.
[0023] As a preferred embodiment, the conductor 10 includes a first structural layer and a second structural layer, the second structural layer is located outside the first structural layer, the first structural layer includes a metal wire bundle twisted structure, and the second structural layer includes a single or double layer of metal wires twisted outside the first structural layer.
[0024] The first structural layer includes a plurality of first monofilaments, and the second structural layer includes a plurality of second monofilaments, wherein the diameter of the second monofilaments is greater than that of the first monofilaments.
[0025] In this way, since the monofilaments in the second structural layer have a large diameter, they are stronger than the monofilaments in the first structural layer. The monofilaments with a slightly larger diameter in the outer layer provide additional protection and support for the monofilaments in the inner layer, especially improving the bending deformation of the cable during the stripping of the insulation layer and the sheath layer or subsequent processing. Therefore, the exposed conductor 10 after stripping the insulation is conducive to being directly inserted into the connecting hole of the integrated connector without the need to correct the exposed metal wire.
[0026] In an optional embodiment, the second monofilament comprises tinned copper wire. Compared to bare copper wire, tinned copper wire has stronger corrosion resistance and oxidation resistance. Since photovoltaic cables may need to be frequently plugged and unplugged during use, they are more likely to be exposed to the elements. Using tinned copper wire can meet the oxidation resistance requirements and extend the service life of weak current cables.
[0027] Furthermore, the diameter of the second monofilament is 2 to 3 times that of the first monofilament. Thus, the second monofilament has a stronger mechanical strength than the first monofilament, and is less likely to bend or warp when the insulation layer is stripped off by wire strippers, thus maintaining the conductor 10 in a complete bundle without divergence.
[0028] In an optional embodiment, the maximum diameter of the second monofilament is 1.2 mm, and the diameter of the first monofilament is 0.4 mm.
[0029] Preferably, the second structural layer includes a layer of second monofilament, the diameter of the second monofilament is 3 times that of the first monofilament, and the larger diameter difference is utilized to provide the second monofilament with a good supporting effect on the first monofilament, and the gap between the single-layer second monofilament is smaller than the diameter of the first monofilament.
[0030] In an optional embodiment, the first structural layer includes a three-layer twisted structure of 1+6+12, the first layer twisted structure includes one bundle of metal wires, the second layer twisted structure includes 6 bundles of metal wires, and the third layer twisted structure includes 12 bundles of metal wires.
[0031] In each layer of the twisted structure, the metal wire bundles are set to a 1+6 tinned copper wire twisted structure.
[0032] In other embodiments, when the photovoltaic cable has a longitudinally laid design and has high tensile strength requirements, the metal wire bundles of the first layer twisted structure include a stainless steel twisted structure 11, and the metal wire bundles of the second layer twisted structure and the third layer twisted structure include a tinned copper wire twisted structure 12.
[0033] In this way, by providing a stainless steel wire twisted structure in the middle of the conductor 10 , the tensile strength of the photovoltaic cable is increased.
[0034] In the above embodiment, a water-blocking yarn 13 is further provided in the gap between the first and second structural layers. The provision of the water-blocking yarn 13 improves the axial water-blocking capability of the conductor 10, thereby preventing water vapor from intruding into the cable from the connector, thereby improving the service life and reliability of the cable.
[0035] In an optional embodiment, insulation layer 20 comprises a cross-linked polyolefin insulation layer. This layer has a high heat resistance and can typically operate at elevated temperatures for extended periods without degradation. It also offers excellent insulation properties, effectively preventing problems such as current leakage and short circuits. Furthermore, the cross-linking treatment further stabilizes the molecular structure of the cross-linked polyolefin insulation layer, resulting in enhanced aging resistance and extending the service life of the wire and cable.
[0036] In an optional embodiment, the sheath layer 30 includes a low-smoke, halogen-free, flame-retardant polyolefin sheath layer. During combustion, the low-smoke, halogen-free, flame-retardant polyolefin sheath layer generates very little smoke, which is non-toxic and harmless, and will not cause secondary damage to the human body.
[0037] In combination with the above embodiments, the photovoltaic cable proposed by the present invention sets the conductor to include a first structural layer and a second structural layer. The second structural layer is on the outside of the first structural layer. The second structural layer is composed of metal wires with a thicker diameter. The first structural layer is formed by twisting metal wire bundles with a thinner diameter. While maintaining the good flexibility of the cable, the outer layer of the conductor is not easy to deform, especially after stripping the insulation layer, the metal wire is not easy to disperse, so that the conductor of the photovoltaic cable is easier to directly insert into the connection hole of the integrated connector when the connector is connected, realizing an integrated connection with the connector, and the wiring process is faster and more convenient.
[0038] While the present invention has been described above with reference to preferred embodiments, this is not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.
Claims
1. A low-smoke, halogen-free, flame-retardant photovoltaic cable, characterized in that: It comprises a conductor (10), an insulating layer (20) and a sheath layer (30) distributed from the inside to the outside, wherein the conductor (10) comprises a multi-layer twisted structure; The conductor (10) comprises a first structural layer and a second structural layer, the second structural layer is located on the outer layer of the first structural layer, the first structural layer comprises a metal wire bundle twisted structure, and the second structural layer comprises a single layer or a double layer of metal wires twisted on the outer layer of the first structural layer; The first structural layer includes a plurality of first monofilaments, and the second structural layer includes a plurality of second monofilaments. The diameter of the second monofilaments is greater than that of the first monofilaments.
2. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 1, characterized in that: The second monofilament comprises a tinned copper wire.
3. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 2, characterized in that: The diameter of the second monofilament is 2 to 3 times the diameter of the first monofilament.
4. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 1, characterized in that: The maximum diameter of the second monofilament is 1.2 mm.
5. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 1, characterized in that: The first structural layer includes a three-layer twisted structure of 1+6+12, wherein the first layer of the twisted structure includes one bundle of metal wires, the second layer of the twisted structure includes six bundles of metal wires, and the third layer of the twisted structure includes 12 bundles of metal wires.
6. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 1, characterized in that: The metal wire bundle is arranged as a 1+6 tinned copper wire twisted structure.
7. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 5, characterized in that: The metal wire bundles of the first layer twisted structure include a stainless steel twisted structure, and the metal wire bundles of the second layer twisted structure and the third layer twisted structure include a tinned copper wire twisted structure.
8. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to any one of claims 1 to 7, characterized in that: A water-blocking yarn (13) is provided in the gap between the first structural layer and the second structural layer.
9. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 1, characterized in that: The insulating layer (20) comprises a cross-linked polyolefin insulating layer.
10. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 1, characterized in that: The sheath layer (30) comprises a low-smoke, halogen-free, flame-retardant polyolefin sheath layer.