Water-blocking photovoltaic cable

Abstract

The utility model discloses a waterproof photovoltaic cable in the field of photovoltaic cables, which comprises a reinforcing core, a photovoltaic cable core, a shielding layer, a flame retardant layer, a first waterproof layer, a second waterproof layer and an outer sheath which are sequentially arranged from inside to outside, and the photovoltaic cable core comprises a plurality of photovoltaic core wires surrounding the periphery of the reinforcing core. A plurality of elastic filling pieces are arranged between the photovoltaic core wires and the shielding layer, the first water-blocking layer adopts water-blocking lines to wrap the outer side of the flame-retardant layer, water-blocking glue is filled between every two adjacent water-blocking lines, the second water-blocking layer is an aluminum-plastic composite belt, the outer sheath adopts an irradiation cross-linked polyolefin material conforming to the thermal extension standard, and the outer sheath adopts a flame-retardant material conforming to the thermal extension standard. The elongation under load is not more than 80%, and the elongation after cooling is not more than 1%. The sealing structure has good waterproof performance and can be fully bonded with pouring sealant / sealant, and the sealing performance of the sealing structure is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic cables, and particularly relates to a water-blocking photovoltaic cable. Background Art

[0002] Photovoltaic cables and junction boxes are important components of solar energy photovoltaic power generation systems. In order to ensure that the solar photovoltaic power generation system can work reliably and stably, when the photovoltaic cable is assembled with the junction box, the wiring threaded port at the outer end of the photovoltaic cable must be integrally formed with the connection and waterproofed to meet strict sealing requirements. Since the photovoltaic cable and the junction box are connected by a self-locking structure that is inserted and fixed, the line inlet needs to be injected with potting glue / sealant for waterproofing to meet strict sealing requirements.

[0003] If the waterproofing treatment is not in place, water or moisture will enter the cable through the cable inlet, reducing the surface resistance of the photovoltaic cable and accelerating the aging of water trees, resulting in a shortened cable life and easy breakdown. Therefore, compared with other performance, the waterproofing and sealing performance of photovoltaic cables are particularly important and more demanding for solar photovoltaic power generation systems. Utility Model Content

[0004] The utility model aims to provide a water-blocking photovoltaic cable, which has good waterproof performance and can be fully bonded with potting glue / sealant to improve the sealing performance of the sealing structure.

[0005] The purpose of the utility model is achieved as follows: a water-blocking photovoltaic cable, comprising a reinforcing core, a photovoltaic cable core, a shielding layer, a flame retardant layer, a first water-blocking layer, a second water-blocking layer and an outer sheath arranged in sequence from the inside to the outside, the photovoltaic cable core comprising a plurality of photovoltaic core wires wrapped around the outer circumference of the reinforcing core, a plurality of elastic filling members are arranged between the photovoltaic core wires and the shielding layer, the first water-blocking layer is wrapped around the outer side of the flame retardant layer with a water-blocking wire, a water-blocking glue is filled between two adjacent water-blocking wires, the second water-blocking layer is an aluminum-plastic composite tape, the outer sheath is made of irradiated cross-linked polyolefin material that meets the thermal extension standard, and the elongation under load is not more than 80%, and the elongation after cooling is not more than 1%.

[0006] When the utility model is used, the thermal extension quality of the outer sheath is proportional to the bonding area between the surface of the photovoltaic cable and the potting glue / sealant, and the outer sheath of the photovoltaic cable adopts the radiation cross-linking process, and the polymer generates macromolecular free radicals under the action of high-energy rays and the monomer grafting reaction to generate a graft copolymer, and the grafting reaction occurs between polyolefin molecules, which changes the surface state of the outer sheath, making it have a polar plastic surface, improving the surface polarity of the outer sheath, and facilitating the bonding of its surface with the potting glue / sealant. Compared with the prior art, the beneficial effect of the utility model is that: the bonding performance between the surface of the photovoltaic cable and the potting glue / sealant is improved, and the outer sheath made of radiation cross-linked polyolefin has strong compression resistance and compression deformation resistance, and combined with the internal elastic filling parts, it can ensure that the photovoltaic cable still maintains strength and excellent electrical performance at high temperature; the first water-blocking layer and the water-blocking glue can block water longitudinally (or axially), and the second water-blocking layer can block water radially (or transversely), thereby further improving the overall water-blocking performance of the photovoltaic cable.

[0007] As a further improvement of the utility model, the reinforcing core is formed by twisting a plurality of steel wires.

[0008] As a further improvement of the utility model, the photovoltaic cable core includes a conductor and an insulating layer coated outside the conductor.

[0009] As a further improvement of the utility model, the conductor is formed by twisting a plurality of tin-copper alloy wires, and the insulating layer is made of cross-linked polyethylene material.

[0010] As a further improvement of the utility model, the shielding layer is a tinned round copper wire braided mesh or an aluminum-magnesium-gold wire braided mesh.

[0011] As a further improvement of the present invention, the flame retardant layer is one or more layers of mica tape layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0013] Figure 2 It is a cross-sectional view of the utility model.

[0014] Among them, 1 is a reinforcing core, 2 is a photovoltaic core wire, 201 is a conductor, 202 is an insulating layer, 3 is a shielding layer, 4 is a flame retardant layer, 5 is a first water-blocking layer, 501 is a water-blocking wire, 6 is an outer sheath, 7 is an elastic filling piece, and 8 is a second water-blocking layer. DETAILED DESCRIPTION

[0015] like Figure 1 and 2As shown, it is a water-blocking photovoltaic cable, comprising a reinforcing core 1, a photovoltaic cable core, a shielding layer 3, a flame retardant layer 4, a first water-blocking layer 5 and an outer sheath 6 arranged in sequence from the inside to the outside, the reinforcing core 1 is made of a plurality of steel wires twisted together; the photovoltaic cable core comprises four photovoltaic core wires 2 surrounding the outer periphery of the reinforcing core 1, the photovoltaic cable core comprises a conductor 201 and an insulating layer 202 coated on the outside of the conductor 201, the conductor 201 is preferably made of a plurality of tin-copper alloy wires twisted together, and the insulating layer 202 is made of a cross-linked polyethylene material; the shielding layer 3 is Tinned round copper wire braided mesh or aluminum-magnesium gold wire braided mesh; four elastic filling pieces 7 are arranged between the photovoltaic core wire 2 and the shielding layer 3; the flame retardant layer 4 is one or more layers of mica tape; the first water-blocking layer 5 is a circle of water-blocking wire 501 wrapped around the outside of the flame retardant layer 4, and water-blocking glue is filled between two adjacent water-blocking wires 501, and the second water-blocking layer 8 is an aluminum-plastic composite tape; the outer sheath 6 is made of irradiated cross-linked polyolefin material that meets the thermal extension standard, with an elongation under load of no more than 80% and an elongation after cooling of no more than 1%.

[0016] The advantages of the utility model are: in addition to the conductive advantage of electrical copper wires, the tin-copper alloy conductors have better high-temperature resistance, which can ensure long-term safe and stable operation in solar power stations; the aluminum-plastic tape longitudinal wrapping is used to further enhance the radial water-blocking performance of the cable; the water-blocking wire 501 contains water-blocking powder, which expands when it encounters water to form a blocked water seepage channel, thereby preventing moisture from penetrating into the cable, and stopping the further diffusion and extension of water or water vapor, thereby effectively protecting the photovoltaic cable; the tinned round copper wire braided mesh or the aluminum-magnesium-gold wire braided mesh can provide additional mechanical protection and electromagnetic interference shielding, further improving the overall performance of the photovoltaic cable.

[0017] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A water-blocking photovoltaic cable, characterized in that: The photovoltaic cable core comprises a reinforcing core, a photovoltaic cable core, a shielding layer, a flame retardant layer, a first water-blocking layer, a second water-blocking layer and an outer sheath which are arranged in sequence from the inside to the outside. The photovoltaic cable core comprises a plurality of photovoltaic core wires wrapped around the outer circumference of the reinforcing core. A plurality of elastic filling members are arranged between the photovoltaic core wires and the shielding layer. The first water-blocking layer is wrapped around the outer side of the flame retardant layer with a water-blocking wire, and a water-blocking glue is filled between two adjacent water-blocking wires. The second water-blocking layer is an aluminum-plastic composite tape. The outer sheath is made of irradiated cross-linked polyolefin material that meets the thermal extension standard, and the elongation under load is not more than 80%, and the elongation after cooling is not more than 1%.

2. A water-blocking photovoltaic cable according to claim 1, characterized in that: The reinforcing core is formed by twisting a plurality of steel wires.

3. A water-blocking photovoltaic cable according to claim 1, characterized in that: The photovoltaic cable core comprises a conductor and an insulating layer coated outside the conductor.

4. A water-blocking photovoltaic cable according to claim 3, characterized in that: The conductor is formed by twisting a plurality of tin-copper alloy wires, and the insulating layer is made of cross-linked polyethylene material.

5. The water-blocking photovoltaic cable according to claim 1, characterized in that: The shielding layer is a tinned round copper wire braided mesh or an aluminum-magnesium-gold wire braided mesh.

6. A water-blocking photovoltaic cable according to claim 1, characterized in that: The flame retardant layer is one or more layers of mica tape layers.

Images