Waterproof double-layer halogen-free low-smoke photovoltaic cable

Abstract

The utility model belongs to the technical field of cables, particularly relates to a water-resistant double-layer halogen-free low-smoke photovoltaic cable, and provides the following scheme aiming at the problems that a large amount of heat is generated when an existing photovoltaic cable works, the sealed cable cannot timely dissipate the heat, the cable is overheated, and fire hazards exist, the water-resistant double-layer halogen-free low-smoke photovoltaic cable comprises a plurality of cable cores; the cable sequentially comprises an outer sheath, a shielding layer, a waterproof layer, a flame-retardant layer and three inner sheaths from outside to inside, wherein a plurality of cable cores are uniformly arranged in the three inner sheaths; the buffer part comprises three outer support cylinders arranged in the waterproof layer, the three outer support cylinders are uniformly arranged among the three inner layer sheaths, and the three outer support cylinders are hollow and are used for providing an effective buffer space for cable bending; and hot air in the inner sheath is circulated into the outer supporting cylinder through the communicating pipe to be dispersed, so that the temperature in the cable is effectively reduced, and the service life of the cable is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a water-resistant double-layer halogen-free and low-smoke photovoltaic cable. Background Art

[0002] Photovoltaic cable is a cable specially used in solar photovoltaic systems, and its characteristics include uniform sheath thickness and small diameter. Photovoltaic cables need to meet a series of specific requirements, such as sufficient strength to avoid mechanical damage, high conductivity to reduce temperature rise and increase current carrying capacity, good low-temperature flexibility to avoid low-temperature embrittlement, heat resistance of at least 80 degrees, excellent long-term high-temperature stability, resistance to chemical solvents, moisture, weather, UV and ozone, etc. Through testing by technicians, the temperature values ​​that can be measured on the roof are sometimes as high as 100-110℃, which requires the cable to withstand a wide range of temperature changes. In addition, photovoltaic cables also need to have excellent weather resistance, UV resistance and ozone resistance to delay the effects of long-term atmospheric aging.

[0003] In the prior art, the operating environment of photovoltaic cables is relatively harsh. To cope with rain erosion and prevent rainwater from entering the pipe, the inside of the cable needs to be sealed. However, photovoltaic cables generate a lot of heat when working. The sealed cables cannot dissipate the heat in time, which will cause the cables to overheat and pose a fire hazard. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings in the prior art that a large amount of heat is generated when the photovoltaic cable is working, and the sealed cable cannot dissipate the heat in time, which will cause the cable to overheat and pose a fire hazard. A water-resistant double-layer halogen-free low-smoke photovoltaic cable is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A water-resistant double-layer halogen-free low-smoke photovoltaic cable, comprising a plurality of cable cores;

[0007] The cable comprises an outer sheath, a shielding layer, a waterproof layer, a flame retardant layer and three inner sheaths from outside to inside, and a plurality of the cable cores are evenly arranged in the three inner sheaths;

[0008] A buffer portion, the buffer portion comprising three outer support tubes arranged in the waterproof layer, the three outer support tubes being evenly arranged between the three inner sheaths, and the three outer support tubes being hollow inside to provide an effective buffer space for cable bending;

[0009] A support component is arranged between the shielding layer and the waterproof layer to provide rigid support for the cable.

[0010] In a possible design, the three outer support cylinders are all made of rubber.

[0011] In a possible design, a plurality of connecting pipes are fixedly connected between the three outer supporting tubes and the three inner jackets, and the plurality of connecting pipes are respectively used to circulate the hot air in the three inner jackets to the three outer supporting tubes for dispersion.

[0012] In a possible design, the support assembly includes a plurality of steel strands, a plurality of accommodating grooves are formed between the waterproof layer and the shielding layer, and the plurality of steel strands are respectively disposed in the plurality of accommodating grooves.

[0013] In a possible design, an inner support tube is fixed inside the flame retardant layer, and a buffer gap is provided inside the inner support tube.

[0014] In a possible design, the shielding layer is braided from tinned copper wires.

[0015] In a possible design, the flame retardant layer is made of a halogen-free flame retardant.

[0016] In a possible design, the waterproof layer is made of polyethylene, and the outer sheath is made of PVC.

[0017] Beneficial Effects

[0018] In the utility model, by using a waterproof layer made of polyethylene and an outer sheath made of PVC, the photovoltaic cable of this embodiment has excellent water resistance and can be used for a long time in a humid environment;

[0019] In the utility model, the flame retardant layer made of halogen-free flame retardant and the inner support tube are arranged, so that the cable can effectively prevent the spread of fire when a fire occurs, thereby improving the safety of the cable;

[0020] In the utility model, the design of the outer support tube and the hollow structure enables the cable to provide an effective buffer space when being bent, thereby protecting the wire core inside the cable from mechanical damage; the hot air in the inner sheath is circulated to the outer support tube through the connecting tube for dispersion, thereby effectively reducing the temperature inside the cable and increasing the service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a main perspective view of a water-resistant double-layer halogen-free low-smoke photovoltaic cable proposed by the utility model;

[0022] Figure 2 This is a partial cross-sectional view of a water-resistant double-layer halogen-free low-smoke photovoltaic cable proposed by the utility model;

[0023] Figure 3This is a partial stereoscopic diagram of a water-resistant double-layer halogen-free low-smoke photovoltaic cable proposed by the utility model.

[0024] In the figure: 1. Cable core; 2. Inner sheath; 3. Flame retardant layer; 4. Outer support tube; 5. Waterproof layer; 6. Steel strand; 7. Receiving groove; 8. Inner support tube; 9. Shielding layer; 10. Outer sheath; 11. Connecting pipe. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] Example 1

[0027] Reference Figure 1-Figure 3 , a cable, a photovoltaic cable mainly includes multiple cable cores 1, an outer sheath 10, a shielding layer 9, a waterproof layer 5, a flame retardant layer 3 and three inner sheaths 2. Among them, multiple cable cores 1 are evenly arranged in three inner sheaths 2. From the outside to the inside, the cable is composed of an outer sheath 10, a shielding layer 9, a waterproof layer 5, a flame retardant layer 3 and three inner sheaths 2 in sequence;

[0028] The support assembly includes a plurality of steel strands 6, a plurality of accommodating grooves 7 are formed between the waterproof layer 5 and the shielding layer 9, and the plurality of steel strands 6 are respectively arranged in the plurality of accommodating grooves 7; in order to enhance the bending resistance of the cable, in this embodiment, three outer support tubes 4 are arranged in the waterproof layer 5, and the three outer support tubes 4 are evenly arranged between the three inner sheaths 2, and are all hollow structures, which are used to provide an effective buffer space when the cable is bent, and protect the wire core inside the cable from mechanical damage;

[0029] In addition, considering the heat that may be generated by the cable during operation, the present embodiment also fixes a plurality of connecting tubes 11 between the three outer support tubes 4 and the three inner sheaths 2. These connecting tubes 11 can circulate the hot air in the inner sheath 2 to the outer support tube 4 for dispersion, thereby effectively reducing the temperature inside the cable and increasing the service life of the cable.

[0030] The present application can be used for photovoltaic cables, and can also be used in other fields applicable to the present application.

[0031] Example 2

[0032] refer to Figure 1-Figure 3, improved on the basis of Example 1: a water-resistant double-layer halogen-free low-smoke photovoltaic cable, which is used in the field of photovoltaic cable technology. In order to enhance the flame retardant performance of the cable, the present embodiment fixes an inner support tube 8 in the flame retardant layer 3, and a buffer gap is provided in the inner support tube 8, which can provide a certain buffering effect when the cable is subjected to external impact. At the same time, the flame retardant layer 3 is made of halogen-free flame retardant, has excellent flame retardant performance, and can effectively prevent the spread of fire when a fire occurs in the cable;

[0033] In order to ensure the water resistance and environmental protection performance of the cable, the waterproof layer 5 in this embodiment is made of polyethylene and the outer sheath 10 is made of PVC. Both materials have good water resistance and environmental protection performance and can meet the use requirements of photovoltaic cables in humid environments. In addition, the shielding layer 9 is woven from tinned copper wire and has good electromagnetic shielding performance.

[0034] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A water-resistant double-layer halogen-free low-smoke photovoltaic cable, characterized in that: include: A plurality of cable cores (1); The cable comprises, from outside to inside, an outer sheath (10), a shielding layer (9), a waterproof layer (5), a flame retardant layer (3) and three inner sheaths (2), and a plurality of the cable cores (1) are evenly arranged in the three inner sheaths (2); A buffer portion, the buffer portion comprising three outer support tubes (4) arranged in the waterproof layer (5), the three outer support tubes (4) being evenly arranged between the three inner sheaths (2), and the three outer support tubes (4) being hollow inside to provide an effective buffer space for cable bending; A support component is provided between the shielding layer (9) and the waterproof layer (5) and is used to provide rigid support for the cable.

2. A water-resistant double-layer halogen-free low-smoke photovoltaic cable according to claim 1, characterized in that: The three outer support cylinders (4) are all made of rubber.

3. A water-resistant double-layer halogen-free low-smoke photovoltaic cable according to claim 2, characterized in that: A plurality of connecting tubes (11) are fixedly connected between the three outer supporting tubes (4) and the three inner jackets (2), and the plurality of connecting tubes (11) are respectively used to circulate the hot air in the three inner jackets (2) to the three outer supporting tubes (4) for dispersion.

4. The water-resistant double-layer halogen-free low-smoke photovoltaic cable according to claim 1, characterized in that: The support assembly comprises a plurality of steel strands (6), a plurality of accommodating grooves (7) are formed between the waterproof layer (5) and the shielding layer (9), and the plurality of steel strands (6) are respectively arranged in the plurality of accommodating grooves (7).

5. The water-resistant double-layer halogen-free low-smoke photovoltaic cable according to claim 1, characterized in that: An inner support tube (8) is fixed inside the flame retardant layer (3), and a buffer gap is provided inside the inner support tube (8).

6. The water-resistant double-layer halogen-free low-smoke photovoltaic cable according to claim 1, characterized in that: The shielding layer (9) is woven from tinned copper wires.

7. The water-resistant double-layer halogen-free low-smoke photovoltaic cable according to claim 1, characterized in that: The flame retardant layer (3) is made of a halogen-free flame retardant.

8. The water-resistant double-layer halogen-free low-smoke photovoltaic cable according to claim 1, characterized in that: The waterproof layer (5) is made of polyethylene, and the outer sheath (10) is made of PVC.

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