A photovoltaic cable that is resistant to salt fog and seawater

Abstract

The invention discloses a salt fog and seawater proof photovoltaic cable, which relates to the technical field of cables. The cable comprises a cable core, and the cable further comprises: an armor layer, which is arranged on the outside of a connecting layer and connected to the connecting layer. The armor layer comprises a connecting piece, and a plurality of connecting pieces are arranged on the connecting layer in a ring array. A sliding piece is slidably connected inside each connecting piece, and an expansion layer is arranged between two adjacent connecting pieces. A telescopic piece is also arranged on both sides corresponding to the connecting piece and the expansion layer. The invention cooperates with the expansion layer and the sliding piece, so that after the cable is exposed to the sun for a long time, the telescopic piece can be extended by the change of temperature to shield the expansion layer, thereby avoiding the problem of damage to the expansion layer after being exposed to the sun for a long time. At the same time, the extension of the telescopic piece can effectively clean the salt fog crystals near the connecting piece, and the automatic cleaning of the salt fog crystals on the cable can be realized in combination with the expansion of the expansion layer, which is more suitable for use in marine environments.

Description

Technical Field

[0001] The invention relates to the technical field of cables, and in particular to a salt fog and seawater proof photovoltaic cable. Background Art

[0002] Salt fog and seawater resistant photovoltaic cables are high-performance cables designed for harsh marine environments. Photovoltaic cables are usually used in floating photovoltaic power station systems and have excellent physical properties such as high and low temperature resistance, UV radiation resistance, waterproofness, salt fog resistance, weak acid and alkali resistance, aging resistance, and flame retardancy. In the marine environment, salt fog and seawater formed by salt are particularly corrosive to cables, and traditional cables are difficult to meet the needs of long-term stable operation.

[0003] A Chinese patent with application number 202010651216.X discloses a high-temperature resistant photovoltaic cable suitable for salt spray environment, including a cable body, the cable body including a cable core and a cable sheath, and the special-shaped bracket is composed of two staggered "S"-shaped fixed brackets, and wires are embedded in the arcs at both ends of each fixed bracket, and optical fiber units that are in contact with the tops of two adjacent wires are provided between the arcs at the tops of the two fixed brackets, and two lifting bodies are provided at the intersection of the two fixed brackets, and the cable sheath includes a wear-resistant layer, a heat-conducting layer, a hydrophobic layer and an outer protective layer from the inside to the outside, a metal mesh body is provided between the wear-resistant layer and the heat-conducting layer, and a heat dissipation mechanism is provided in the wear-resistant layer, and the heat dissipation mechanism includes a heat dissipation groove opened on the wear-resistant layer, a lifting rod fixed on the top of the lifting body, and a sealing gasket adapted to the heat dissipation groove. The invention not only has high compressive resistance, but also can accelerate its heat dissipation effect through the heat dissipation mechanism under the action of external impact force.

[0004] Similar to the above-mentioned salt spray-proof cables of the prior art, an anti-corrosion layer is usually installed on the outside of the cable to avoid the problem of salt spray and seawater corrosion on the cable surface. However, when the photovoltaic cable is transmitting electricity during the day, the cable itself will generate heat, and under the influence of external light and the anti-corrosion layer, the heat dissipation performance of the cable will be reduced, which can easily cause the cable temperature to rise abnormally and cause damage. When the photovoltaic cable is not working at night, the cable needs to be insulated to avoid the problem of the cable temperature being too low affecting the service life.

[0005] Meanwhile, the existing salt spray-proof cables can only avoid the corrosion of the cables by salt spray and seawater to a certain extent by adding an anti-corrosion layer. However, after long-term use, the anti-corrosion layer of the cables will still be corroded. The prior art lacks a device that can clean the salt spray crystals on the cable surface.

[0006] Therefore, it is necessary to invent a salt fog and seawater proof photovoltaic cable to solve the above problems. Summary of the invention

[0007] The object of the present invention is to provide a salt fog and seawater proof photovoltaic cable to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: a salt fog and seawater proof photovoltaic cable, comprising a cable core, the photovoltaic cable also comprising:

[0009] A connecting layer, which is arranged on the outside of the cable core and can fix and cover the multiple cable cores;

[0010] An armor layer, wherein the armor layer is arranged on the outside of the connecting layer and connected to the connecting layer, the armor layer comprises a connecting piece, a plurality of the connecting pieces are arranged in a ring array on the connecting layer, a sliding piece is slidably connected inside each of the connecting pieces, an expansion layer is arranged between two adjacent connecting pieces, and telescopic pieces are further arranged on both sides of the connecting piece corresponding to the expansion layer. The expansion layer can expand and contract according to the change of sea temperature, collect the salt spray crystals adsorbed on the cable and insulate the cable, and the telescopic piece can assist the expansion layer in cleaning the salt spray crystals adsorbed on the cable.

[0011] Preferably, the sliding member is fixedly connected to the two expansion layers at both sides close to the expansion layer, the connecting member is provided with a slide groove enabling the ends of the expansion layers to slide, and a sealing member is provided at one end of the slide groove away from the cable core.

[0012] Preferably, one end of the seal is fixedly connected to the side wall of the slide groove, and the other end of the seal is fixedly connected to the expansion layer. The seal can be expanded and contracted according to the movement of the expansion layer so that the interior of the connector is always in a sealed state.

[0013] Preferably, a through groove is provided in the middle of the sliding member, and a limiting member is respectively provided at one end of the sliding member close to the cable core and at one end away from the cable core. The two limiting members are connected by a connecting rod, and the limiting members can slide on the sliding member.

[0014] Preferably, the inner cavity of the connecting member is located on both sides of the sliding member and two fixing members are respectively provided, and the two fixing members can respectively cooperate with the two limiting members in a wedge shape to push the limiting members to slide on the sealing member to open the through groove.

[0015] Preferably, the inner cavity of the connecting piece is divided into two chambers by a sliding piece, the side close to the cable core is an insulation chamber, and the side away from the cable core is a heat exchange chamber. The insulation chamber is connected with the side of the expansion layer close to the cable core through a slide groove, and the heat exchange chamber is connected with the telescopic piece, and the telescopic piece can be extended and retracted by changes in air pressure in the heat exchange chamber.

[0016] Preferably, the cable core comprises conductive wires connected together by multiple composite hinges, and an insulating layer is provided on the outer side of each cable core. The insulating layer is a double-layer structure, wherein the inner layer of the insulating layer comprises rubber, and the outer layer of the insulating layer comprises polyethylene.

[0017] Preferably, the connection layer is provided with a plurality of grooves in an annular array corresponding to the connection pieces one by one, and the connection layer and the connection pieces are fixedly connected.

[0018] Preferably, fillers are provided between the plurality of insulating layers, the fillers uniformly cover the insulating layers and wrap the insulating layers, and the fillers are fixedly connected to the connecting layer.

[0019] Preferably, the outer surfaces of the expansion layer and the connecting member are coated with corrosion-resistant paint.

[0020] Technical effects and advantages of the present invention:

[0021] 1. The present invention sets an expansion layer so that the cable can control the expansion or contraction of the expansion layer according to temperature changes and day and night changes, and according to its day and night characteristics, salt fog crystals cannot be adsorbed on the cable for a long time, thereby improving the cable's ability to resist salt fog and seawater.

[0022] 2. The present invention cooperates with the expansion layer and the sliding part so that after the cable is exposed to the sun for a long time, the expansion part can be extended by temperature change to shield the expansion layer and avoid damage to the expansion layer after long-term exposure to the sun. At the same time, the extension of the expansion part can effectively clean the salt mist crystals near the connecting part, and the expansion of the expansion layer can realize automatic cleaning of the salt mist crystals on the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 For the present invention Figure 1 Schematic diagram of the mechanism structure at A in the middle.

[0025] Figure 3 It is a schematic diagram of the explosion structure of the armor layer of the present invention.

[0026] Figure 4 This is a schematic diagram of the normal state of the photovoltaic cable of the present invention.

[0027] Figure 5 This is a schematic diagram of the photovoltaic cable of the present invention in the daytime working state.

[0028] Figure 6 This is a schematic diagram of the photovoltaic cable of the present invention in the state of being exposed to sunlight.

[0029] Figure 7 This is a schematic diagram of the nighttime status of the photovoltaic cable of the present invention.

[0030] In the figure: 1, cable core; 2, connecting layer; 3, armor layer; 31, connecting piece; 32, sliding piece; 33, expansion layer; 34, telescopic piece; 35, slide groove; 36, sealing piece; 37, through groove; 38, limit piece; 39, fixing piece; 4, insulation layer; 5, filler. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] To improve the salt spray resistance of the cable, Figures 1 to 7 As shown, in the first embodiment of the present invention, a salt fog and seawater proof photovoltaic cable is disclosed, including a cable core 1, the cable core 1 includes conductive wires connected together by multiple composite hinges, and an insulating layer 4 is provided on the outer side of each cable core 1. The insulating layer 4 is a double-layer structure, the inner layer of the insulating layer 4 includes rubber, and the outer layer of the insulating layer 4 includes polyethylene.

[0033] In this embodiment, the cable further comprises a connecting layer 2, which is arranged on the outside of the cable core 1. The connecting layer 2 can fix and cover the multiple cable cores 1, and the connecting layer 2 is made of corrosion-resistant material.

[0034] In this embodiment, a filler 5 is provided between multiple insulating layers 4. The filler 5 is a thermosetting phenolic resin. The thermosetting phenolic resin has the characteristics of stability, heat resistance and electrical insulation. The filler 5 is uniformly covered on the insulating layer 4 and wraps the insulating layer 4. The filler 5 is fixedly connected to the connecting layer 2.

[0035] The corrosion-resistant connecting layer 2 is provided to isolate seawater and salt mist crystals, thereby preventing the cable core 1 from corrosion.

[0036] However, the above-mentioned salt spray-proof cable can only avoid the cable from being corroded by salt spray and seawater to a certain extent by adding an anti-corrosion layer. However, after long-term use, the cable anti-corrosion layer will still be corroded. The prior art lacks a device that can remove the salt spray crystals on the cable surface.

[0037] To solve the above technical problems, in another embodiment of the present invention, the photovoltaic cable also includes: an armor layer 3, the armor layer 3 is arranged on the outside of the connecting layer 2 and connected to the connecting layer 2, the armor layer 3 includes a connector 31, and a plurality of connectors 31 are arranged in a ring array on the connecting layer 2, each connector 31 is slidably connected with a sliding member 32, an expansion layer 33 is provided between two adjacent connectors 31, and telescopic members 34 are also provided on both sides corresponding to the connector 31 and the expansion layer 33. The expansion layer 33 can expand and contract according to changes in sea temperature, collect salt spray crystals adsorbed on the cable and insulate the cable.

[0038] In this embodiment, the sliding member 32 is fixedly connected to the two expansion layers 33 on both sides close to the expansion layer 33, and a slide groove 35 is provided on the connecting member 31 to enable the end of the expansion layer 33 to slide. A sealing member 36 is provided at the end of the slide groove 35 away from the cable core 1, and the outer surfaces of the expansion layer 33 and the connecting member 31 are coated with corrosion-resistant paint.

[0039] In this embodiment, one end of the seal 36 is fixedly connected to the side wall of the slide groove 35, and the other end of the seal 36 is fixedly connected to the expansion layer 33. The seal 36 can expand and contract according to the movement of the expansion layer 33 so that the interior of the connector 31 is always in a sealed state.

[0040] In this embodiment, a plurality of grooves corresponding to the connecting members 31 are formed in an annular array on the connecting layer 2 , and the connecting layer 2 and the connecting members 31 are fixedly connected.

[0041] When in use, since the photovoltaic cable is set at sea, and because there is a temperature difference between day and night at sea, the frequency of salt fog crystallization during the day is higher than that at night. Therefore, when the photovoltaic cable is operating during the day, since the cable itself dissipates heat when transmitting electric energy, and the temperature is higher during the day, the gas between the expansion layer 33 and the connecting layer 2 can expand under the action of high temperature and push the expansion layer 33 to expand away from the connecting layer 2, thereby causing the expansion layer 33 exposed to the environment containing salt fog and seawater to deform, and the salt fog crystals on the expansion layer 33 are separated from the expansion layer 33. In this process, since the ambient temperature of the cable can change with the passage of time, and the change in temperature will cause the gas pressure set between the expansion layer 33 and the connecting layer 2 to change, the expansion layer 33 can always be in a changing state under the sunlight environment, thereby avoiding the excessively high temperature during the day at sea causing the salt fog crystallization frequency to be too fast, covering the cable and corroding the cable.

[0042] When the photovoltaic cable is at night, the photovoltaic panel does not perform photoelectric conversion, so the cable core 1 does not transmit electric energy, that is, the cable core 1 does not emit heat at night, and the external ambient temperature is too low. In this state, the gas between the expansion layer 33 and the connecting layer 2 can shrink under the action of low temperature compared to the daytime, thereby driving the expansion layer 33 to shrink in the direction close to the cable core 1, so that the gas between the expansion layer 33 and the connecting layer 2 absorbs heat during the day and keeps the cable core 1 warm at night. At the same time, due to the contraction of the expansion layer 33, the salt mist crystals that slowly precipitate at night can cover the expansion layer 33, and after the temperature rises during the day, as the expansion layer 33 expands, the salt mist crystals can be separated from the cable, thereby preventing the cable anti-corrosion layer from being corroded after long-term use.

[0043] It should be noted that when the expansion layer 33 is expanding or contracting, the sliding member 32 can be driven to slide in the connecting member 31 as the air pressure changes.

[0044] However, since the photovoltaic cable itself generates heat when transmitting electricity during the day, and the cable is prone to abnormal temperature rise and damage after long-term exposure to the sun, and as the expansion layer 33 expands, some salt mist crystals will gather on both sides of the connector 31, the cable still needs to be manually cleaned regularly.

[0045] To solve the above technical problems, in another embodiment of the present invention, the photovoltaic cable also includes: a through groove 37 is opened in the middle of the sliding member 32, and a limit member 38 is respectively provided at one end of the sliding member 32 close to the cable core 1 and the other end away from the cable core 1, and the two limit members 38 are connected by a connecting rod, and the limit member 38 can slide on the sliding member 32.

[0046] In this embodiment, telescopic members 34 are further provided on both sides of the connecting member 31 corresponding to the expansion layer 33 . The telescopic members 34 can assist the expansion layer 33 in cleaning the salt mist crystals adsorbed on the cable.

[0047] In this embodiment, two fixing members 39 are respectively provided on both sides of the inner cavity of the connecting member 31 and the sliding member 32. The two fixing members 39 can respectively cooperate with the two limiting members 38 in a wedge shape to push the limiting members 38 to slide on the sealing member 36 to open the through groove 37.

[0048] In the embodiment, the inner cavity of the connecting member 31 is divided into two chambers by a sliding member 32, the side close to the cable core 1 is an insulation chamber, and the side away from the cable core 1 is a heat exchange chamber. The insulation chamber is connected with the side of the expansion layer 33 close to the cable core 1 through a slide groove 35, and the heat exchange chamber is connected with the telescopic member 34. The telescopic member 34 can be extended and retracted according to the change of air pressure in the heat exchange chamber.

[0049] When the photovoltaic cable is used during the day, as the external temperature changes, the gas between the expansion layer 33 and the connecting layer 2 can expand under the action of high temperature and push the expansion layer 33 to expand in a direction away from the connecting layer 2, thereby causing the expansion layer 33 exposed to the environment containing salt mist and seawater to deform, so that the salt mist crystals on the expansion layer 33 are separated from the expansion layer 33, and as the expansion layer 33 expands, some of the salt mist crystals are gathered on both sides of the connector 31.

[0050] When the outside temperature gradually rises, that is, when the photovoltaic cable is exposed to the sun for a long time, the heat absorbed by the expansion layer 33 gradually increases, so that the temperature of the gas in the heat preservation chamber gradually increases. Since the heat exchange chamber in the connector 31 is arranged at the end away from the cable core 1 and is in contact with the outside through the connector 31, the air pressure in the heat exchange chamber is lower than the air pressure in the heat preservation chamber under the heat exchange effect between the seawater and the connector 31. As the air pressure in the heat preservation chamber gradually increases, the gas in the heat preservation chamber can push the sliding member 32 to move a second time, so that the sliding member 32 moves away from the cable core 1. The sliding member 32 moves in the direction of the cable core 1. During this process, the limiting member 38 on the side of the sliding member 32 away from the cable core 1 can contact the fixing member 39, and as the sliding member 32 continues to move, the limiting member 38 is pushed, so that the through groove 37 is connected with the heat preservation chamber and the heat exchange chamber. In this state, the high-pressure gas in the heat preservation chamber can flow into the heat exchange chamber through the through groove 37, so that the expansion layer 33 shrinks, and at the same time, the telescopic member 34 connected with the heat exchange chamber is extended, so as to shield the expansion layer 33 and avoid the expansion layer 33 from being damaged due to long-term exposure to the sun.

[0051] At the same time, since the telescopic member 34 is arranged on the side of the expansion layer 33 away from the cable core 1, the salt mist crystals gathered on both sides of the connecting member 31 during the expansion process of the expansion layer 33 can be cleaned by the extension of the telescopic member 34, so that the salt mist crystals are completely separated from the photovoltaic cable, and since the photovoltaic cable is used in a floating water photovoltaic power station system, the separation of the salt mist crystals from the photovoltaic cable can be promoted as the waves push the floating water photovoltaic power station.

[0052] It should be noted that the telescopic member 34 is specifically a telescopic mechanism of a bellows-like structure, which can be extended or shortened by changes in the internal gas. A reset structure is provided at the connection between the limit member 38 and the sliding member 32. The reset structure can be a reset spring, which drives the limit member 38 to reset and seal the through groove 37 after the limit member 38 is separated from the fixing member 39.

[0053] When the photovoltaic cable is used at night, the photovoltaic panel does not perform photoelectric conversion, so the cable core 1 does not transmit electric energy, that is, the cable core 1 does not emit heat at night, and the external ambient temperature is too low. In this state, the gas between the expansion layer 33 and the connecting layer 2 can shrink under the action of low temperature compared to that during the day, thereby driving the expansion layer 33 to shrink in the direction close to the cable core 1. In this process, the sliding member 32 is driven by the expansion layer 33 to move in the direction close to the cable core 1. At this time, the limit member 38 is separated from the fixing member 39. Under the drive of the reset structure, the limit member 38 can seal the through groove 37 to separate the insulation cavity from the heat insulation cavity again. As the temperature gradually decreases, when the expansion layer 33 drives the sliding member 32 to continue to move in the direction of the cable core 1 during the contraction process, the limit member 38 and the fixing member 39 arranged on the side of the sliding member 32 close to the cable core 1 are in contact with each other, and the movement of the limit member 38 can make the insulation cavity and the heat exchange cavity connect again through the through groove 37, thereby balancing the gas and facilitating the expansion layer 33 to expand during subsequent daytime operations.

[0054] It should be particularly noted that the present invention, through the provision of the expansion layer 33, enables the cable to control the expansion or contraction of the expansion layer 33 according to temperature changes and day and night changes, and according to its day and night characteristics, the salt fog crystals cannot be adsorbed on the cable for a long time, thereby improving the cable's ability to resist salt fog and seawater; on the other hand, through the mutual cooperation of the expansion layer 33 and the sliding member 32 and other devices, the cable can extend the telescopic member 34 due to temperature changes after being exposed to the sun for a long time, thereby shielding the expansion layer 33 and avoiding the problem of damage to the expansion layer 33 after being exposed to the sun for a long time. At the same time, the extension of the telescopic member 34 can effectively clean the salt fog crystals located near the connecting member 31, and the automatic cleaning of the salt fog crystals on the cable can be achieved in combination with the expansion of the expansion layer 33.

[0055] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A salt fog and seawater proof photovoltaic cable, comprising a cable core, characterized in that: The photovoltaic cable also includes: A connecting layer, wherein the connecting layer is arranged on the outside of the cable core; An armor layer, the armor layer is arranged on the outside of the connection layer and connected to the connection layer, the armor layer includes a connection piece, a plurality of the connection pieces are arranged on the connection layer in an annular array, a sliding piece is slidably connected inside each of the connection pieces, an expansion layer is arranged between two adjacent connection pieces, and telescopic pieces are also arranged on both sides of the connection piece corresponding to the expansion layer; The two sides of the sliding member close to the expansion layer are respectively fixedly connected to the two expansion layers, the connecting member is provided with a slide groove that enables the end of the expansion layer to slide, and a sealing member is provided at one end of the slide groove away from the cable core; One end of the sealing member is fixedly connected to the side wall of the slide groove, and the other end of the sealing member is fixedly connected to the expansion layer. A through groove is provided in the middle of the sliding member. A stopper is provided at one end of the sliding member close to the cable core and at one end of the sliding member far from the cable core respectively. The two stoppers are connected by a connecting rod, and the stopper can slide on the sliding member. The inner cavity of the connecting member is located on both sides of the sliding member and is provided with two fixing members respectively. The two fixing members can respectively cooperate with the two limiting members in a wedge shape to push the limiting members to slide on the sealing member to open the through groove; The inner cavity of the connecting piece is divided into two chambers by a sliding piece. The side close to the cable core is an insulation chamber, and the side away from the cable core is a heat exchange chamber. The insulation chamber is connected with the side of the expansion layer close to the cable core through a slide groove, and the heat exchange chamber is connected with the telescopic piece. The telescopic piece can be extended and retracted according to the change of air pressure in the heat exchange chamber.

2. The photovoltaic cable according to claim 1, characterized in that: The sealing member can expand and contract according to the movement of the expansion layer so that the interior of the connecting member is always in a sealed state.

3. The photovoltaic cable according to claim 2, characterized in that: The cable core comprises conductive wires connected together by multiple composite hinges. An insulating layer is provided on the outer side of each cable core. The insulating layer is a double-layer structure. The inner layer of the insulating layer comprises rubber, and the outer layer of the insulating layer comprises polyethylene.

4. The photovoltaic cable according to claim 3, characterized in that: The connection layer is provided with a plurality of grooves in an annular array corresponding to the connection pieces one by one, and the connection layer and the connection pieces are fixedly connected.

5. The photovoltaic cable according to claim 4, characterized in that: Fillers are arranged between the plurality of insulating layers, the fillers evenly cover the insulating layers and wrap the insulating layers, and the fillers are fixedly connected to the connecting layer.

6. The photovoltaic cable according to claim 5, characterized in that: The outer surfaces of the expansion layer and the connecting piece are coated with corrosion-resistant paint.

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