Corrosion-resistant special photovoltaic cable

Abstract

The invention relates to a corrosion-resistant special photovoltaic cable in the field of cables. The corrosion-resistant special photovoltaic cable comprises a wire core, the wire core is coated with an inner protective layer, the inner protective layer is provided with a reinforced wire row, and the reinforced wire row is coated with an outer protective layer; the wire core comprises a wire core main body, the outer side of the wire core main body is coated with a porous protective layer, and a liquid isolating membrane is laid on the porous protective layer; the reinforced wire row comprises a plurality of reinforced wires which are bonded at equal intervals around the wire core, a shaping net is arranged among the plurality of reinforced wires, and corrosion-resistant protective films are laid at the upper end and the lower end of the shaping net; the outer side of the shaping net is coated with an insulation protection layer, the insulation protection layer is detachably provided with a plurality of segment protection sleeves, the multi-protection design of the scheme provides comprehensive protection for the cable, the segment protection sleeves cooperate to dynamically protect the cable, protection oil is released to cover a wire core during dynamic protection, the corrosion resistance of the cable is improved, and the service life of the cable is prolonged. Limited protection of the cable core after the external part of the cable is damaged is ensured, and the cable is especially suitable for cable protection in a severe environment.

Description

Technical Field

[0001] The invention relates to a corrosion-resistant special photovoltaic cable, in particular to a corrosion-resistant special photovoltaic cable applied in the field of cables. Background Art

[0002] Existing special photovoltaic cables have unique properties to adapt to the special requirements of outdoor environments and solar panels. The main features of these cables include high temperature resistance, UV resistance, bending resistance and good electrical properties. They are usually used to connect solar panels, inverters and distribution systems.

[0003] In terms of application areas, special photovoltaic cables are widely used in residential, commercial and industrial solar power generation projects. Special photovoltaic cables are deficient in corrosion resistance. Due to long-term exposure to outdoor environments, cables may be affected by chemicals, salt spray, moisture and extreme temperatures, all of which may cause degradation of cable insulation and sheath materials. Especially for photovoltaic systems installed near the seaside or industrial areas, the corrosion problem is more serious. Through these improvement measures, the service life and reliability of special photovoltaic cables will be significantly improved, thereby reducing maintenance costs and improving the efficiency of the entire solar power generation system.

[0004] In order to solve the problem of cable corrosion prevention, a certain cable in the market adopts an anti-corrosion coating design and has a certain market share.

[0005] Chinese invention patent CN202311743572.4 discloses a corrosion-resistant PE cable conduit and its production process. The corrosion-resistant PE cable conduit of the invention includes a PE cable conduit body and a protective coating arranged on the outer peripheral side of the PE cable conduit body: the PE cable conduit body is made of modified polyethylene, the modified polyethylene includes polyethylene, p-vinylbenzylamine, end-vinyl-terminated hydroxyl silicone oil and filler, and the protective coating is made of corrosion-resistant protective coating. In the corrosion-resistant PE cable conduit in the application, the protective coating has a high adhesion strength to the PE cable conduit body, which improves the protective effect of the protective coating on the PE cable conduit body, which is beneficial to extend the service life of the PE cable conduit.

[0006] Existing cables have several defects in corrosion resistance. First, the outer sheath materials of many cables, such as PVC (polyvinyl chloride) and PE (polyethylene), are easily degraded under certain chemicals, oils or extreme temperature conditions, resulting in a decrease in physical properties. Second, when the outer sheath of the cable is damaged by external damage, the core is easily corroded due to its weak internal corrosion resistance, which in turn affects the electrical conductivity and service life of the cable. Summary of the invention

[0007] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that after the existing cable is damaged by external damage and the outer sheath is damaged, the wire core is easily corroded due to its weak internal corrosion resistance after the outer sheath is damaged, thereby affecting the conductive performance and service life of the cable.

[0008] In order to solve the above problems, the present invention provides a special anti-corrosion photovoltaic cable, comprising a wire core, an inner protective layer is coated on the wire core, a reinforcing wire row is arranged on the inner protective layer, and an outer protective layer is coated on the reinforcing wire row; the wire core comprises a wire core body, a porous protective layer is coated on the outer side of the wire core body, and a liquid isolation membrane is laid on the porous protective layer; The reinforcing wire array includes a plurality of reinforcing wires equidistantly bonded around the wire core, the reinforcing wires include a high-strength wire bundle, the high-strength wire bundle is covered with a corrosion-resistant sponge sleeve, a shaping net is arranged between the plurality of reinforcing wires, and a corrosion-resistant protective film is laid on both the upper and lower ends of the shaping net; The shaping net includes a raised portion and a recessed portion, the raised portion is in contact with the reinforcement wire, the recessed portion is located between two adjacent reinforcement wires, and the inner and outer ends of the shaping net are both paved with corrosion-resistant films; The outer side of the shaping net is covered with an insulating protective layer, a corrosion-resistant resin layer is filled between the insulating protective layer and the recessed part, and a plurality of segment protective covers are detachably arranged on the insulating protective layer.

[0009] In the above-mentioned special corrosion-resistant photovoltaic cable, multiple protective measures including outer protective layer, reinforcement wire, corrosion-resistant resin layer and insulating protective layer are used to provide comprehensive protection for the cable.

[0010] As a further improvement of the present application, a plurality of evenly distributed identification grooves are provided on the insulating protective layer, and the positions of the identification grooves are aligned with the center lines of the recessed portions; the depth of the identification grooves is 1-3 mm.

[0011] As a further improvement of the present application, the segment protection cover includes a pair of flexible base layers, on which are arranged a plurality of pairs of hollow pads, on which are installed a plurality of fixing needles which penetrate into the hollow pads, and inside of which are arranged an oil storage bag which stores protective oil.

[0012] As a further improvement of the present application, one end of the fixing needle is inserted between two adjacent reinforcement lines along the identification groove, and the other end of the fixing needle is inserted into the oil storage bag in the hollow cushion block, and the distance between two adjacent segment protective sleeves is less than 5-10cm.

[0013] As another improvement of the present application, a method for wrapping a reinforcing wire with a shaping net includes: after the reinforcing wire is equidistantly bonded to the wire core, it is wrapped with a shaping net; after wrapping the shaping net, a corrosion-resistant resin is coated on the shaping net to fill the recessed portion; then an insulating protective layer is wrapped; and finally, the resin is heated to solidify into a corrosion-resistant resin layer.

[0014] As another improved supplement of the present application, the high-strength wire harness comprises thick wire segments and thin wire segments, the thick wire segments and the thin wire segments are alternately distributed, and the high-strength wire harness is made of corrosion-resistant fiber braiding.

[0015] As another improved supplement of the present application, the fixing needle includes a hollow seat connected to the flexible base layer, a hollow cannula is provided through the hollow seat, the length of the hollow cannula is smaller than the diameter of the reinforcement wire, and before the segment protection cover is installed, a socket matching the hollow cannula is pre-opened on the identification groove, and oil guide holes are opened on the side walls at both ends of the hollow cannula.

[0016] As another improved supplement of the present application, an airbag is arranged in the hollow pad, a pressure plate matching the oil storage bag is arranged in the cavity inside the hollow pad, a plurality of compression springs are connected between the pressure plate and the inner wall of the cavity, an exhaust pipe connected to the airbag is installed on the pressure plate, an identification layer for closing the exhaust pipe outlet is arranged on the surface of the hollow pad, and the identification layer and the insulating protective layer are both made of insulating material.

[0017] In summary, the multiple protection design of this scheme provides comprehensive protection for the cable, and cooperates with the segment protection cover to dynamically protect the cable. During dynamic protection, the protective oil is released to cover the core, which improves the corrosion resistance of the cable and ensures limited protection of the core after external damage of the cable. It is especially suitable for cable protection in harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional diagram of the first embodiment of the present application; Figure 2 for Figure 1 Schematic diagram of the structure at A in the middle; Figure 3 This is an exploded view of the first embodiment of the present application; Figure 4 This is a cross-sectional view of the second embodiment of the present application; Figure 5 for Figure 4 The structural diagram at B in the middle; Figure 6 This is a three-dimensional diagram of the fixing needle of the first and second embodiments of the present application.

[0019] Description of the numbers in the figure: 1 wire core, 2 reinforced wire, 21 high-strength wire harness, 22 corrosion-resistant sponge cover, 3 shaping net, 31 raised portion, 32 recessed portion, 4 corrosion-resistant resin layer, 5 insulating protective layer, 6 segment protective cover, 61 flexible base layer, 62 hollow pad, 621 airbag, 622 pressure plate, 623 exhaust pipe, 624 compression spring, 63 fixing needle, 631 hollow seat, 632 hollow cannula. DETAILED DESCRIPTION

[0020] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0021] The first implementation method: Figure 1-5 It is shown that a special anti-corrosion photovoltaic cable includes a core 1, the core 1 is coated with an inner protective layer, a reinforcing wire row is arranged on the inner protective layer, and an outer protective layer is coated on the reinforcing wire row; the core 1 includes a core body, the outer side of the core body is coated with a porous protective layer, and a liquid isolation membrane is laid on the porous protective layer; The reinforcing wire row includes a plurality of reinforcing wires 2 equidistantly bonded around a wire core 1, the reinforcing wires 2 include a high-strength wire bundle 21, the high-strength wire bundle 21 is covered with a corrosion-resistant sponge sleeve 22, the high-strength wire bundle 21 includes thick wire segments and thin wire segments, the thick wire segments and the thin wire segments are alternately distributed, and the high-strength wire bundle is made of corrosion-resistant fiber braiding; a certain hollow space is left between the reinforcing wires 2, so that protective oil can be injected into the reinforcing wire row as needed for enhanced protection; The purpose of providing the high-strength wire harness 21 with thick wire segments and thin wire segments is that when the protective oil is injected into the space between two adjacent reinforcing wires 2, the protective oil can be discharged into the gaps between other reinforcing wires 2 through the thin wire segments, making it easy to quickly cover the surface of the wire core 1 with the protective oil; A shaping net 3 is arranged between the multiple strengthening wires 2, and a corrosion-resistant protective film is laid on both the upper and lower ends of the shaping net 3; The method of wrapping the reinforcing wire 2 with the shaping net 3 includes: after the reinforcing wire 2 is equidistantly bonded to the wire core 1, it is then wrapped with the shaping net 3. After wrapping the shaping net 3, a corrosion-resistant resin is coated on the shaping net 3 to fill the recessed portion 32, and then the insulating protective layer 5 is wrapped, and finally the resin is heated to solidify into a corrosion-resistant resin layer 4.

[0022] The shaping net 3 includes a raised portion 31 and a recessed portion 32. The raised portion 31 is attached to the reinforcement wire 2, and the recessed portion 32 is located between two adjacent reinforcement wires 2. The inner and outer ends of the shaping net 3 are both paved with corrosion-resistant films. The corrosion-resistant film is a thin film covering the shaping net 3, and the corrosion-resistant film includes a fluoropolymer protective film and a polytetrafluoroethylene (PTFE) film. The outer side of the shaping net 3 is covered with an insulating protective layer 5 , a corrosion-resistant resin layer 4 is filled between the insulating protective layer 5 and the recessed portion 32 , and a plurality of segment protective covers 6 are detachably provided on the insulating protective layer 5 .

[0023] The segment protection sleeve 6 includes a pair of flexible base layers 61, the butt joints of the pair of flexible base layers 61 are clamped or fixed by screws, a plurality of pairs of hollow pads 62 are arranged on the flexible base layer 61, a plurality of fixing needles 63 are installed on the flexible base layer 61 to penetrate the hollow pads 62, an oil storage bag is arranged in the hollow pads 62, and protective oil is stored in the oil storage bag; the technicians in this field select suitable protective oil for filling, such as silicone oil; A plurality of evenly distributed identification grooves are provided on the insulating protective layer 5, and the positions of the identification grooves are aligned with the center lines of the recessed portion 32; the depth of the identification grooves is 1-3 mm; one end of the fixing needle 63 is inserted between two adjacent reinforcement lines 2 along the identification groove, and the other end of the fixing needle 63 is inserted into the oil storage bag in the hollow cushion block 62, and the distance between two adjacent segment protective covers 6 is less than 5-10 cm.

[0024] The protective oil in the hollow pad 62 is slowly released into the reinforced wire row through the fixing needle 63 so that the surface of the wire core 1 is covered with the protective oil, which improves the heat dissipation effect of the wire core 1 on the one hand and isolates the external corrosive substances and external air from the wire core 1 on the other hand.

[0025] When installing the segment protection cover 6, select the identification slot of the installation position to open a jack, the jack needs to penetrate the corrosion-resistant resin layer 4 and the shaping net 3, and then install the fixing pin 63. When installing, the hollow seat 631 of the fixing pin 63 is inserted into the identification slot, and one end of the hollow plug 632 is inserted into the reinforcement line row; then install the flexible base 61. When installing, the flexible base 61 covers the hollow plug 632 and inserts one end of the hollow plug 632 into the oil storage bag. After the pair of flexible bases 61 are installed, the insulating protective layer 5 is tightly hugged, and then the butt joint of the pair of flexible bases 61 is fixed. When fixing the butt joint, bonding or screw fixing can be selected according to needs. After fixing the butt joint, the installation of the segment protection cover 6 can be completed; When the cable of this scheme is used, the insulating protective layer 5 is used for external insulation protection. When the external environment is poor, external pollutants are easily accumulated in the identification groove. When the insulating protective layer 5 is corroded and fails, the corroded products are likely to contact the corrosion-resistant resin layer 4 first, and the corrosion-resistant resin layer 4 plays a primary protection role after the insulating protective layer 5 fails. When the insulating protective layer 5 is accidentally damaged, external corrosive substances enter the insulating protective layer 5 from the broken part, and are initially protected by the corrosion-resistant resin layer 4. After the corrosion-resistant resin layer 4 is damaged by corrosion, it is then protected by the shaped mesh 3. Since the shaping net 3 of the present invention is provided with a raised portion 31 and a recessed portion 32, the raised portion 31 is in contact with the reinforcement wire 2, and when the corrosive material penetrates from the raised portion 31, it is isolated by the reinforcement wire 2, and when it penetrates from the recessed portion 32, it is isolated and protected by the thicker corrosion-resistant resin layer 4; The raised portion 31 of the shaping net 3 of the present solution can play a buffering and protective role. When subjected to external damage, protection is provided by the raised portion 31 and the reinforcing wire 2. That is, when subjected to external damage, the damaged position on the shaping net 3 is likely to appear in the area of ​​the raised portion 31. In this way, when the cable is subjected to external damage, the damaged opening has been blocked by the reinforcing wire 2, and anti-corrosion protection is provided by the reinforcing wire 2, ensuring that the wire core 1 is not easily contacted with external corrosive substances.

[0026] The multiple protection design of this embodiment provides comprehensive protection for the cable through multiple protection measures such as the outer protective layer 3, the reinforcement wire 2, the corrosion-resistant resin layer 4 and the insulating protective layer 5, which significantly improves the corrosion resistance and service life of the cable. The use of high-strength wire harness woven with corrosion-resistant fibers and corrosion-resistant sponge sleeves, as well as the setting of the corrosion-resistant resin layer, ensure that the cable can maintain good performance even in harsh environments and effectively prevent corrosive substances from contacting the wire core 1.

[0027] Second implementation method: Figure 5-6 As shown, an airbag 621 is arranged in the hollow cushion block 62, a pressure plate 622 matching the oil storage bag is arranged in the cavity in the hollow cushion block 62, a plurality of compression springs 624 are connected between the pressure plate 622 and the inner wall of the cavity, an exhaust pipe 623 communicating with the airbag 621 is installed on the pressure plate 622, and a marking layer for sealing the air outlet of the exhaust pipe 623 is arranged on the surface of the hollow cushion block 62, and the marking layer and the insulating protective layer 5 are both made of insulating material. The fixing needle 63 includes a hollow seat 631 connected to the flexible base layer 61, and a hollow cannula 632 is provided through the hollow seat 631. The length of the hollow cannula 632 is smaller than the diameter of the reinforcement line 2. Before the segment protection cover is installed, a socket matching the hollow cannula 632 is pre-opened on the identification groove, and the side walls at both ends of the hollow cannula 632 are provided with oil guide holes.

[0028] When the airbag 621 is inflated, the pressure plate 622 does not pressurize the oil storage bag. After the airbag 621 is exhausted, the compression spring 624 is reset, so that the pressure plate 622 pressurizes the oil storage bag. At this time, the oil contained in the oil storage bag is quickly discharged through the fixed needle 63 to the reinforcement line. When the external environment of the cable is poor, both the insulating protective layer 5 and the identification layer are corroded by the outside. Since the identification layer is thinner than the insulating protective layer 5, when the environment is poor, the identification layer is corroded and damaged first. At this time, the airbag 621 exhausts air through the exhaust pipe 623; when the pressure plate 622 is not supported by the airbag 621, it is reset to the left and right of the compression spring 623. During the reset process, the oil storage bag is pressurized to squeeze the protective oil in the oil storage bag toward the fixing needle 63 and discharge it to the reinforcement line through the fixing needle 63. After the protective oil is injected into the reinforcement line, it flows along the gap between two adjacent reinforcement lines 2 to cover the cable area between two adjacent segment protective sleeves 6. After the insulating protective layer 5 of the cable is corroded and damaged, due to the strengthening effect of the protective oil, when the shaping net 3 is corroded and damaged, the protective oil covers the corrosion damage point, which plays a role in isolating the corrosive substances from further corroding the wire core. At the same time, the corrosion-resistant sponge sleeve 22 on the high-strength wire harness 21 also absorbs the protective oil to improve the corrosion resistance of the reinforcement line 2, so that the reinforcement line 2 is not easily corroded and damaged, ensuring that the cable still has good strength when it is corroded.

[0029] This embodiment realizes a dynamic protection mechanism for the cable, and provides a protection measure that quickly responds to changes in the external environment through the combination of the airbag 621 and the compression spring 624. When the external environment is harsh and the identification layer is corroded and damaged, the airbag 621 is exhausted and the compression spring 624 is reset, thereby applying pressure to the oil storage bag, prompting the protective oil to be quickly discharged to the reinforced wire row of the cable. After the protective oil is quickly discharged, it covers the reinforced wire row between two adjacent segment protective sleeves 6. This design ensures that when the cable insulation layer is damaged, the protective oil can cover the damaged area in time, effectively isolate the corrosive substances, and prevent further damage to the wire core.

[0030] The protective oil will also be slowly released through the fixed needle during the use of the cable, so that the protective oil can be effectively distributed in the cable. This dynamic protection mechanism not only improves the corrosion resistance of the cable, but also extends the service life of the cable. It is especially suitable for cable protection in harsh environments.

[0031] In summary, the multiple protection design of this embodiment provides comprehensive protection for the cable, and cooperates with the segment protection cover 6 to dynamically protect the cable. During dynamic protection, the protective oil is released to cover the core 1, thereby improving the corrosion resistance of the cable and ensuring limited protection for the core 1 after external damage to the cable. It is especially suitable for cable protection in harsh environments.

[0032] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A corrosion-resistant special photovoltaic cable, comprising a wire core (1), the wire core (1) being coated with an inner protective layer, a reinforcement wire row being arranged on the inner protective layer, and an outer protective layer being coated on the reinforcement wire row; characterized in that: The wire core (1) comprises a wire core body, the outer side of the wire core body is covered with a porous protective layer, and a liquid isolation membrane is laid on the porous protective layer; The reinforcing wire array comprises a plurality of reinforcing wires (2) which are equidistantly bonded around a wire core (1), the reinforcing wires (2) comprising a high-strength wire bundle (21), the high-strength wire bundle (21) being coated with a corrosion-resistant sponge sleeve (22), a shaping net (3) being arranged between the plurality of reinforcing wires (2), and a corrosion-resistant protective film being laid on both the upper and lower ends of the shaping net (3); The shaping net (3) comprises a raised portion (31) and a recessed portion (32), wherein the raised portion (31) is in contact with the reinforcement wire (2), and the recessed portion (32) is located between two adjacent reinforcement wires (2), and both inner and outer ends of the shaping net (3) are provided with a corrosion-resistant film; The outer side of the shaping net (3) is coated with an insulating protective layer (5), a corrosion-resistant resin layer (4) is filled between the insulating protective layer (5) and the recessed portion (32), and a plurality of segment protective sleeves (6) are detachably provided on the insulating protective layer (5).

2. The corrosion-resistant special photovoltaic cable according to claim 1, characterized in that: The insulating protective layer (5) is provided with a plurality of evenly distributed identification grooves, and the positions of the identification grooves are aligned with the midline of the recessed portion (32); the depth of the identification grooves is 1-3 mm.

3. The corrosion-resistant special photovoltaic cable according to claim 2, characterized in that: The segment protection sleeve (6) comprises a pair of flexible base layers (61), a plurality of pairs of hollow cushion blocks (62) are arranged on the flexible base layers (61), a plurality of fixing needles (63) are installed on the flexible base layers (61) and penetrate into the hollow cushion blocks (62), an oil storage bag is arranged inside the hollow cushion blocks (62), and protective oil is stored in the oil storage bag.

4. The corrosion-resistant special photovoltaic cable according to claim 3, characterized in that: One end of the fixing needle (63) is inserted between two adjacent reinforcement lines (2) along the identification groove, and the other end of the fixing needle (63) is inserted into the oil storage bag in the hollow cushion block (62). The distance between two adjacent segment protection sleeves (6) is less than 5-10 cm.

5. The corrosion-resistant special photovoltaic cable according to claim 1, characterized in that: The method for wrapping the reinforcing wire (2) with the shaping net (3) comprises: after the reinforcing wire (2) is equidistantly bonded to the wire core (1), the shaping net (3) is used to wrap it; after the shaping net (3) is wrapped, a corrosion-resistant resin is coated on the shaping net (3) to fill the recessed part (32); then, an insulating protective layer (5) is wrapped; and finally, heating is performed to solidify the resin into a corrosion-resistant resin layer (4).

6. The corrosion-resistant special photovoltaic cable according to claim 1, characterized in that: The high-strength wire harness (21) comprises thick wire segments and thin wire segments, the thick wire segments and the thin wire segments are alternately distributed, and the high-strength wire harness is braided from corrosion-resistant fibers.

7. The corrosion-resistant special photovoltaic cable according to claim 4, characterized in that: The fixing needle (63) comprises a hollow seat (631) connected to the flexible base layer (61), the hollow seat (631) being provided with a hollow cannula (632) penetrating therethrough, the length of the hollow cannula (632) being smaller than the diameter of the reinforcing wire (2), and before the segment protection sleeve is installed, a plug hole matching the hollow cannula (632) is pre-opened on the identification groove, and oil guide holes are opened on the side walls at both ends of the hollow cannula (632).

8. The corrosion-resistant special photovoltaic cable according to claim 7, characterized in that: An airbag (621) is arranged in the hollow cushion block (62), a pressure plate (622) matching the oil storage bag is arranged in the cavity in the hollow cushion block (62), a plurality of compression springs (624) are connected between the pressure plate (622) and the inner wall of the cavity, an exhaust pipe (623) communicating with the airbag (621) is installed on the pressure plate (622), and a marking layer for sealing the exhaust pipe (623) outlet is arranged on the surface of the hollow cushion block (62), and the marking layer and the insulating protective layer (5) are both made of insulating material.

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