CN223347526U

CN223347526U - Low smoke halogen-free flame retardant photovoltaic cable

Info

Publication number: CN223347526U
Application number: CN202422419923.2U
Authority: CN
Inventors: 王松显; 孙一凡; 李帅; 王文盛; 韩杰; 蒋争光
Original assignee: Wuxi Jiangnan Cable Co Ltd
Current assignee: Wuxi Jiangnan Cable Co Ltd
Priority date: 2024-10-08
Filing date: 2024-10-08
Publication date: 2025-09-16
Anticipated expiration: 2034-10-08

Abstract

The present invention relates to the technical field of wires and cables, and specifically to a low-smoke, halogen-free, 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; wherein the conductor comprises a first structural layer and a second structural layer, wherein the second structural layer is located on the outer layer of the first structural layer, and the first structural layer comprises a metal wire bundle twisted structure. The photovoltaic cable proposed in the present invention sets the conductor to include a first structural layer and a second structural layer, wherein the second structural layer is on the outer side of the first structural layer, the second structural layer is composed of metal wires with a thicker diameter, and the first structural layer is formed by twisting metal wire bundles with a thinner diameter. While maintaining good flexibility of the cable, the outer layer of the conductor is not easily deformed, especially after stripping off the insulation layer, the metal wires are not easily dispersed, so that the conductor can be easily inserted directly into the connection hole of the integrated connector, which is conducive to the use and promotion of the integrated connector.

Description

Low-smoke halogen-free flame-retardant photovoltaic cable

Technical Field

The utility model relates to the technical field of wires and cables, in particular to a low-smoke halogen-free flame-retardant photovoltaic cable.

Background

The photovoltaic cable is a key component for electric energy transmission of a direct current side circuit in a solar photovoltaic power station system, a conductor of the photovoltaic cable is usually pure copper or tin-plated copper, the photovoltaic cable has good electric conductivity and mechanical property, XLPE (cross-linked polyethylene), polyvinyl chloride and other high-quality insulating materials are used for preventing the cable from being corroded and aged in an outdoor environment, and the cable is protected from long-term stable operation in the outdoor environment by combining the high temperature resistance, low temperature resistance and radiation resistance of a cable sheath layer.

The photovoltaic cable is connected with connectors of photovoltaic board, terminal box, through the cable shell cut the back connector, connecting terminal in the present connector adopts split type and integral type, the integral type is more convenient in split type connection compared with, and have higher waterproof ability, split type needs the user to be connected to the tip of cable with the line ball terminal earlier when connecting, the integral type then directly insert when connecting can, the conductor structure of cable uses the fifth class stranded conductor at present, strip insulating back, outer copper wire is flexible, be difficult to the direct insert in the connector of integral type.

Disclosure of utility model

Aiming at the technical problems of the photovoltaic cable in the prior art, the first aspect of the utility model provides a low-smoke halogen-free flame-retardant photovoltaic cable, which comprises a conductor, an insulating layer and a sheath layer which are distributed from inside to outside, wherein the conductor comprises a multi-layer stranded structure;

The conductor comprises a first structural layer and a second structural layer, the second structural layer is positioned on the outer layer of the first structural layer, the first structural layer comprises a metal wire bundle compound structure, and the second structural layer comprises single-layer or double-layer metal wires stranded on the outer layer of the first structural layer;

The first structural layer comprises a plurality of first monofilaments, and the second structural layer comprises a plurality of second monofilaments, wherein the diameters of the second monofilaments are larger than those of the first monofilaments.

Preferably, the second monofilament comprises tinned copper wire.

Preferably, the diameter of the second monofilament is 2-3 times that of the first monofilament.

Preferably, the diameter of the second filaments is a maximum of 1.2mm.

Preferably, the first structure layer comprises a three-layer twisted structure of 1+6+12, the first layer twisted structure comprises one bundle of metal wire bundles, the second layer twisted structure comprises 6 bundles of metal wire bundles, and the third layer twisted structure comprises 12 bundles of metal wire bundles.

Preferably, the metal wire bundles are arranged in a 1+6 tin-plated copper wire stranding configuration.

Preferably, the first layer of twisted wire bundles includes a stainless steel twisted structure, and the second layer of twisted wire bundles and the third layer of twisted wire bundles include a tinned copper wire twisted structure.

Preferably, a water blocking yarn is provided in the gap between the first structural layer and the second structural layer.

Preferably, the insulating layer comprises a crosslinked polyolefin insulating layer.

Preferably, the sheath layer comprises a low smoke zero halogen flame retardant polyolefin sheath layer.

Compared with the prior art, the low-smoke halogen-free flame-retardant photovoltaic cable has the remarkable advantages that:

The conductor of the photovoltaic cable provided by the utility model is arranged to comprise the first structural layer and the second structural layer, the second structural layer is arranged on the outer side of the first structural layer, the second structural layer is formed by twisting metal wires with larger diameters, the first structural layer is formed by twisting metal wire bundles with smaller diameters, the outer layer of the conductor is not easy to deform while the cable is kept to have good flexibility, and particularly after the insulating layer is stripped, the metal wires are not easy to disperse, so that the conductor is easier to be directly inserted into a connecting hole of an integrated connector when the photovoltaic cable is connected, the integrated connection with the connector is realized, and the wiring process is faster and more convenient.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the utility model will now be described, by way of example, with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a low smoke halogen-free flame retardant photovoltaic cable shown in the utility model.

Fig. 2 is a schematic cross-sectional structure of the low smoke halogen-free flame retardant photovoltaic cable shown in the utility model.

Detailed Description

For a better understanding of the technical content of the present utility model, specific examples are set forth below, along with the accompanying drawings.

As shown in fig. 1 and 2, the low smoke halogen-free flame retardant photovoltaic cable according to the first aspect of the present utility model comprises a conductor 10, an insulating layer 20 and a sheath layer 30 distributed from inside to outside. In view of the required bending of the photovoltaic cable to the required angle when connecting the connectors and routing between the individual photovoltaic panels, the conductor 10 adopts a multi-layer stranded structure to ensure good flexibility.

As a preferred embodiment, the conductor 10 includes a first structural layer including a wire bundle lay-up structure and a second structural layer including a single or double layer of wires stranded on the outer layer of the first structural layer.

The first structure layer comprises a plurality of first monofilaments, and the second structure layer comprises a plurality of second monofilaments, wherein the diameters of the second monofilaments are larger than those of the first monofilaments.

In this manner, the larger diameter monofilaments in the second structural layer provide additional protection and support for the inner layer monofilaments compared to the first structural layer because of the higher strength monofilaments, and in particular improve cable bending during insulation and jacket stripping or subsequent processing, thus stripping the insulated exposed conductors 10 for direct insertion into the connection holes of the integrated connector without the need for straightening the exposed wires.

In an alternative embodiment, the second monofilament comprises tin-plated copper wire. Compared with a bare copper wire, the tin-plated copper wire has stronger corrosion resistance and oxidation resistance, and because the photovoltaic cable may need to be frequently plugged and unplugged during use, the photovoltaic cable is exposed to a large probability, and the tin-plated copper wire can meet the oxidation resistance requirement, so that the service life of the weak cable is prolonged.

Further, the diameter of the second monofilament is 2-3 times that of the first monofilament. In this way, the second monofilament has stronger mechanical strength than the first monofilament, and is not easily bent and tilted when the stripper strips the insulation, so that the conductor 10 is maintained in a complete bundle shape and does not diverge.

In an alternative embodiment, the diameter of the second monofilament is a maximum of 1.2mm and the diameter of the first monofilament is 0.4mm.

Preferably, the second structural layer comprises a layer of second filaments having a diameter 3 times that of the first filaments, the larger diameter difference being used to provide good support for the first filaments, the interstices between the individual second filaments being smaller than the diameter of the first filaments.

In an alternative embodiment, the first structural layer comprises a 1+6+12 triple layer lay configuration, the first layer lay configuration comprising one bundle of metal filaments, the second layer lay configuration comprising 6 bundles of metal filaments, and the third layer lay configuration comprising 12 bundles of metal filaments.

Wherein, in each layer of stranded structure, the metal wire bundle is set to be a 1+6 tinned copper wire stranded structure.

In other embodiments, where the photovoltaic cable has a longitudinally laid design and high tensile requirements, the strands of the first layer of lay configuration comprise stainless steel lay configurations 11, and the strands of the second and third layers of lay configurations comprise tinned copper wire lay configurations 12.

In this way, by providing a stainless steel wire lay configuration in the middle of the conductor 10, the tensile properties of the photovoltaic cable are increased.

In the above-described embodiment, further, the water blocking yarn 13 is provided in the gap between the first structural layer and the second structural layer. The water blocking yarn 13 can improve the axial water blocking capability of the conductor 10, prevent the water vapor from entering the cable from the connector, and improve the service life and reliability of the cable.

In an alternative embodiment, the insulating layer 20 comprises a crosslinked polyolefin insulating layer having a high heat-resistant temperature, and generally can be operated at a high temperature for a long period of time without degradation, and the crosslinked polyolefin insulating layer has excellent insulating properties, and can effectively prevent problems such as current leakage and short circuit. In addition, after the cross-linking treatment, the molecular structure of the cross-linked polyolefin insulating layer is more stable, so that the cross-linked polyolefin insulating layer has stronger ageing resistance and can prolong the service life of wires and cables.

In an alternative embodiment, jacket layer 30 comprises a low smoke, halogen-free, flame retardant polyolefin jacket layer. The low-smoke halogen-free flame-retardant polyolefin sheath layer has small smoke quantity generated by the low-smoke halogen-free flame-retardant polyolefin sheath layer in the combustion process, and the smoke is nontoxic and harmless and can not cause secondary injury to human bodies.

In combination with the above embodiment, the photovoltaic cable provided by the utility model has the advantages that the conductor is arranged to comprise the first structural layer and the second structural layer, the second structural layer is arranged on the outer side of the first structural layer, the second structural layer is formed by metal wires with larger diameters, the first structural layer is formed by twisting metal wire bundles with smaller diameters, the outer layer of the conductor is not easy to deform while the cable is kept to have good flexibility, and particularly after the insulating layer is stripped, the metal wires are not easy to disperse, so that the conductor is easier to be directly inserted into the connecting hole of the integrated connector when the photovoltaic cable is connected, the integrated connection with the connector is realized, and the wiring process is faster and more convenient.

While the utility model has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present utility model. Accordingly, the scope of the utility model is defined by the appended claims.

Claims

1. A low-smoke, halogen-free, flame-retardant photovoltaic cable, characterized in that it comprises a conductor (10), an insulation 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 , wherein the second monofilament comprises a tinned copper wire.

3. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 2, wherein 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 , wherein 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 is characterized in that 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.

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.