Corrosion-resistant solar photovoltaic cable

Abstract

The invention discloses a corrosion-resistant solar photovoltaic cable, and particularly relates to a photovoltaic cable, and the cable comprises a wire core which is sleeved with a rubber layer, and the rubber layer is sleeved with an outer sleeve rubber layer; the tensile mechanism comprises composite supporting strips which are arranged between the rubber layer and the outer sleeve rubber layer in a circumferential array mode, the composite supporting strips are provided with containing grooves, the outer sleeve rubber layer is provided with extension parts, the extension parts are arranged in the containing grooves, and the containing grooves are shortened along with extension of the composite supporting strips. The composite supporting strip is arranged between the rubber layer and the outer sleeve rubber layer, in the rubber sleeving process of the rubber layer, flowing glue liquid can form the extending part and permeate into the containing groove formed in the composite supporting strip, and therefore the extending part can abut against the composite supporting strip in the expansion direction during thermal expansion and cold contraction, expansion of the wire core, the rubber layer and the outer sleeve rubber layer is resisted, and the service life of the wire core is prolonged. Therefore, the extension distance is reduced during high-temperature work, and the overall service life is prolonged.

Description

Technical Field

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

[0002] Photovoltaic cables are cables used in solar photovoltaics and are installed between photovoltaic panels and electronic components such as inverters.

[0003] According to patent number CN117497233A, publication (announcement) date: 2024-02-02, a photovoltaic cable is disclosed, which relates to the field of photovoltaic cable technology, including: a metal cable core, a plurality of support blocks are arranged in an annular manner outside the metal cable core, and a placement cavity is formed between adjacent support blocks, and a conductor is arranged in each placement cavity, and a material is filled between the placement cavity and the conductor; a wrapping layer, a flame retardant layer, an isolation layer, a moisture-proof layer and a metal braided layer are wound around the outside of the support block in sequence, and the gap of the metal braided layer is filled with filler, and an outer sheath layer is arranged outside the metal braided layer. The present invention can provide a movable margin for the conductor when it is squeezed through a fan-shaped structure and a plurality of buffer cavities, and the conductor is buffered and protected by the margin, thereby improving the overall buffering effect of the cable, reducing the damage to the internal conductor of the cable caused by external forces, and achieving a protective effect.

[0004] In the prior art including the above-mentioned patent, photovoltaic cables are often made of tinned copper wire wrapped with irradiated cross-linked plastic. Cross-linked plastic has excellent heat resistance and high electrical properties. Therefore, cross-linked plastic has better elasticity than other materials. When cables are installed on solar panels that span a long distance, the internal tinned copper wire and cross-linked plastic will expand and contract due to the better elasticity of the cross-linked plastic. The amplitude of thermal expansion and contraction will increase. Repeated expansion and contraction during long-term temperature changes will cause the creep resistance of the outer layer of the cross-linked plastic to decrease. Combined with the long-term high-temperature working environment, the outer layer is prone to loosening and cracking. Summary of the invention

[0005] The purpose of the present invention is to provide a corrosion-resistant solar photovoltaic cable, aiming to solve the above problems.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: a corrosion-resistant solar photovoltaic cable, comprising: The conductor core is covered with a rubber layer, and the rubber layer is covered with an outer rubber layer; The tensile mechanism comprises composite support bars arranged in a circumferential array between the rubber layer and the outer cover rubber layer, the composite support bars are provided with a receiving groove, the outer cover rubber layer is provided with an extension portion, and the extension portion is arranged in the receiving groove, wherein: The receiving groove shortens as the composite support bar extends so as to squeeze the extension portion.

[0007] Preferably, the composite support bar comprises an upper concave plate and a lower concave plate arranged in a linear array, and the concave surfaces of the upper concave plate and the lower concave plate are arranged opposite to each other in an alternating manner to form the accommodating groove on the lower concave plate.

[0008] Preferably, a cavity layer is provided between the composite support strip and the rubber layer, and the composite support strip is switched between the following two positions: First station: the composite support strip is stretched as the temperature rises, so as to drive the upper concave plate and the lower concave plate to move alternately to squeeze the extension part, and to move the lower concave plate to fit the rubber layer; Second station: the composite support strip shrinks as the temperature decreases, so as to drive the upper concave plate and the lower concave plate to move alternately to pull the extension part, and move the lower concave plate away from the rubber layer.

[0009] Preferably, a heat-conducting ring is provided on the rubber layer, and the composite support strip is switched along with the first station so that the lower concave plate fits the heat-conducting ring.

[0010] Preferably, a limiting filling block is provided between the two concave plates, and the concave plates move as the outer cover rubber layer contracts, so as to drive the concave plates to slide along the limiting filling block and approach the outer cover rubber layer.

[0011] Preferably, a filling arc block is arranged between two of the composite support strips along the inner side of the cavity layer, the limiting filling block is arranged between the two filling arc blocks, and the filling arc block expands and contracts along with the expansion and contraction of the outer cover rubber layer.

[0012] Preferably, support columns are arranged in a linear array on the filling arc block, and the support columns are arranged in the outer jacket rubber layer.

[0013] Preferably, sliding plates are provided at both ends of the upper concave plate and the lower concave plate, and the length of the sliding plate on the upper concave plate is smaller than the length of the sliding plate on the lower concave plate.

[0014] Preferably, silicone strips are symmetrically arranged in the cavity layer, and two silicone strips are pushed and separated by the lower concave plate.

[0015] In the above technical scheme, a corrosion-resistant solar photovoltaic cable provided by the present invention has the following beneficial effects: a composite support strip is arranged between the rubber layer and the outer rubber layer, and during the process of rubber coating the rubber layer, the flowing rubber liquid will form an extension portion and penetrate into the accommodating groove provided on the composite support strip. Therefore, during thermal expansion and contraction, the expansion direction of the extension portion will push against the composite support strip, thereby resisting the expansion of the conductor core, the rubber layer and the outer rubber layer, thereby reducing the extension distance when working at high temperature and increasing the overall service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of a cable cross section provided by an embodiment of the present invention; Figure 2 An overall schematic diagram provided for an embodiment of the present invention; Figure 3 A schematic diagram of a jacket adhesive layer provided in an embodiment of the present invention; Figure 4 A schematic cross-sectional view of the outer cover adhesive layer provided in an embodiment of the present invention; Figure 5 for Figure 4 The enlarged schematic diagram at A in the middle; Figure 6 An explosion diagram of a tensile mechanism provided in an embodiment of the present invention; Figure 7 for Figure 6 The enlarged schematic diagram of point B in the middle; Figure 8 The overall explosion diagram provided for the embodiment of the present invention.

[0018] Description of reference numerals: 1. Outer rubber layer; 11. Extension part; 2. Conductor core; 21. Rubber layer; 3. Tensile mechanism; 31. Composite support strip; 311. Upper concave plate; 312. Lower concave plate; 32. Slide; 33. Fixed plate; 34. Limiting filling block; 35. Filling arc block; 351. Support column; 36. Silicone strip; 4. Thermal conductive ring. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0020] like Figure 1-8 As shown, a corrosion-resistant solar photovoltaic cable comprises: The conductor core 2 is provided with a rubber layer 21, and the rubber layer 21 is provided with a jacket rubber layer 1; The tensile mechanism 3 includes a composite support bar 31 arranged in a circumferential array between the rubber layer 21 and the outer rubber layer 1, the composite support bar 31 is provided with a receiving groove, the outer rubber layer 1 is provided with an extension part 11, and the extension part 11 is arranged in the receiving groove, wherein: The receiving groove shortens as the composite support bar 31 extends, so as to squeeze the extension portion 11 .

[0021] Specifically, the composite support bar 31 is arranged between the rubber layer 21 and the outer jacket rubber layer 1, and is used to support the rubber layer 21 and the outer jacket rubber layer 1 to provide additional support force to the rubber layer 21 and the outer jacket rubber layer 1 after irradiation. During the extrusion of the outer jacket rubber layer 1, the extruded outer jacket rubber layer 1 will penetrate into the receiving groove on the composite support bar 31 due to pressure, thereby forming an extension portion 11. After the cable is installed and in a high-temperature working environment, the conductor core 2, the rubber layer 21 and the outer jacket rubber layer 1 will expand thermally, causing the cable to extend. At this time, the composite support bar 31 will drive the receiving groove to shrink as it extends, and the extension portion 11 will also extend to overcome the shrinkage of the receiving groove, thereby limiting the degree of thermal expansion of the entire cable, thereby reducing deformation and increasing the overall service life of the cable.

[0022] In the above technical solution, a composite support strip 31 is arranged between the rubber layer 21 and the outer rubber layer 1. During the process of rubberizing the rubber layer 21, the flowing glue will form an extension portion 11 and penetrate into the receiving groove provided on the composite support strip 31. Therefore, during thermal expansion and contraction, the expansion direction of the extension portion 11 will push against the composite support strip 31, thereby resisting the expansion of the conductor core 2, the rubber layer 21 and the outer rubber layer 1, thereby reducing the extension distance when working at high temperature and increasing the overall service life.

[0023] As an embodiment provided by the present invention, the composite support bar 31 includes an upper concave plate 311 and a lower concave plate 312 arranged in a linear array, and the concave surfaces of the upper concave plate 311 and the lower concave plate 312 are arranged opposite to each other in an alternating manner to form a receiving groove on the lower concave plate 312.

[0024] Specifically, Figure 5 As shown, the concave surfaces of the upper concave plate 311 and the lower concave plate 312 are arranged facing each other, and the lower concave plate 312 is blocked by the two upper concave plates 311 to form a receiving groove, and the receiving groove has an opening, and the opening of the receiving groove faces the outer jacket rubber layer 1, so that during the process of rubber extrusion of the outer jacket rubber layer 1, the inner jacket rubber layer 1 enters the receiving groove along the opening, and the upper concave plate 311 faces the rubber layer 21, and a fixing plate 33 is arranged between the rubber layer 21 and the outer jacket rubber layer 1 at both ends of the cable, and the outermost concave plate 312 is arranged on the fixing plate 33 to support the composite support strip 31 at the edge.

[0025] After the cable is installed and in a high-temperature working environment, the conductor core 2, the rubber layer 21 and the outer jacket rubber layer 1 will expand due to heat, causing the cable to extend. At this time, the upper concave plate 311 and the lower concave plate 312 will slide against each other as the cable extends, driving the accommodating groove to shrink, and the extension portion 11 will also extend to overcome the shrinkage of the accommodating groove, thereby limiting the degree of thermal expansion of the entire cable.

[0026] As an embodiment provided by the present invention, a cavity layer is provided between the composite support strip 31 and the rubber layer 21, and the composite support strip 31 is switched between the following two positions: First station: the composite support strip 31 stretches as the temperature rises, so as to drive the upper concave plate 311 and the lower concave plate 312 to move alternately to extrude the extension portion 11, and to move the lower concave plate 312 to fit the rubber layer 21; Second working station: the composite support strip 31 shrinks as the temperature decreases, so as to drive the upper concave plate 311 and the lower concave plate 312 to move alternately to pull the extension part 11 , and move the lower concave plate 312 away from the rubber layer 21 .

[0027] Specifically, the upper concave plate 311 and the lower concave plate 312 are made of metal, and a cavity layer is provided between the composite support strip 31 and the rubber layer 21. Figure 7 and Figure 5 As shown, there is a gap between the adjacent lower concave plates 312 and upper concave plates 311, and the gap and the cavity layer are connected. When working at high temperature, the composite support bar 31 stretches as the temperature of the cable rises. At this time, the upper concave plates 311 and the lower concave plates 312 sliding against each other will squeeze the extension 11 in the accommodating groove, and the extended extension 11 will drive the upper concave plates 311 and the lower concave plates 312 away from each other, so that the lower concave plate 312 moves to fit the rubber layer 21, which is the first working position, so as to conduct heat to transfer the heat of the cable, so that The cables in the lower temperature part share the heat of the cables in the high temperature working state, and when working at low temperature, the composite support strip 31 shrinks as the temperature of the cable decreases. At this time, as they shrink, the upper concave plate 311 and the lower concave plate 312 will slide against each other, expand the accommodating groove, and pull the extension part 11. As the extension part 11 is pulled, the thickness decreases, so that the upper concave plate 311 and the lower concave plate 312 are close to each other, and the lower concave plate 312 is moved away from the rubber layer 21, which is the second working position, so as to reduce the thermal conductivity of the conductor core 2 and reduce heat transfer.

[0028] After the cable is installed and in a high-temperature working environment, the conductor core 2, the rubber layer 21 and the outer jacket rubber layer 1 will expand thermally, causing the cable to extend. At this time, the upper concave plate 311 and the lower concave plate 312 will slide against each other as they extend, driving the accommodating groove to shrink, and the extension portion 11 will also extend to overcome the shrinkage of the accommodating groove, thereby limiting the degree of thermal expansion of the entire cable, and the extended extension portion 11 will drive the upper concave plate 311 and the lower concave plate 312 to move away from each other, causing the lower concave plate 312 to move and fit. The rubber layer 21 is the first working position, so as to conduct heat. When working at low temperature, the composite support strip 31 shrinks as the temperature of the cable decreases. At this time, as the shrinkage occurs, the upper concave plate 311 and the lower concave plate 312 will slide against each other, expand the accommodating groove, and pull the extension part 11. As the extension part 11 is pulled, the thickness decreases, so that the upper concave plate 311 and the lower concave plate 312 are close to each other, and the lower concave plate 312 is moved away from the rubber layer 21, which is the second working position, so as to reduce the thermal conductivity of the conductor core 2.

[0029] As an embodiment provided by the present invention, a heat-conducting ring 4 is provided on the rubber layer 21 , and the composite support strip 31 switches with the first station so that the lower concave plate 312 fits the heat-conducting ring 4 .

[0030] Specifically, a heat-conducting ring 4 is provided on the rubber layer 21. The heat-conducting ring 4 is a plurality of metal rings arranged in a linear array. The metal rings are connected by metal strips, thereby covering the rubber layer 21 on the conductor core 2 to increase the heat dissipation capacity of the cable. When the temperature of the working environment increases, the composite support strip 31 switches to the second working position. At this time, the lower concave plate 312 fits the heat-conducting ring 4 made of metal, thereby assisting the cable in heat dissipation.

[0031] After the cable is installed and in a high-temperature working environment, the conductor core 2, the rubber layer 21 and the outer jacket rubber layer 1 will expand thermally, causing the cable to extend. At this time, the upper concave plate 311 and the lower concave plate 312 will slide against each other as they extend, driving the accommodating groove to shrink, and the extension portion 11 will also extend to overcome the shrinkage of the accommodating groove, thereby limiting the degree of thermal expansion of the entire cable, and the extended extension portion 11 will drive the upper concave plate 311 and the lower concave plate 312 to move away from each other, causing the lower concave plate 312 to move and fit. The heat-conducting ring 4 is the first working station, so as to conduct heat. When working at low temperature, the composite support strip 31 shrinks as the temperature of the cable decreases. At this time, as the shrinkage occurs, the upper concave plate 311 and the lower concave plate 312 will slide against each other, expand the accommodating groove, and pull the extension part 11. As the extension part 11 is pulled, the thickness decreases, so that the upper concave plate 311 and the lower concave plate 312 are close to each other, and the lower concave plate 312 is moved away from the rubber layer 21, which is the second working station, so as to reduce the thermal conductivity of the conductor core 2.

[0032] As an embodiment provided by the present invention, a limiting filling block 34 is arranged between the two lower concave plates 312 , and the lower concave plates 312 move as the outer rubber layer 1 contracts, so as to drive the lower concave plates 312 to slide along the limiting filling block 34 and approach the outer rubber layer 1 .

[0033] Specifically, a limiting filling block 34 is arranged between the two lower concave plates 312. The limiting filling block 34 is arranged perpendicular to the cable axis. When the outer rubber layer 1 of the lower concave plate 312 shrinks and moves, that is, when the second workstation moves, the lower concave plate 312 and the upper concave plate 311 approach each other due to shrinkage, so that the lower concave plate 312 slides along the limiting filling block 34, thereby moving away from the rubber layer 21 and approaching the outer rubber layer 1, thereby assisting the movement of the second workstation.

[0034] After the cable is installed and in a high-temperature working environment, the conductor core 2, the rubber layer 21 and the outer jacket rubber layer 1 will expand thermally, causing the cable to extend. At this time, the upper concave plate 311 and the lower concave plate 312 will slide against each other as they extend, driving the accommodating groove to shrink, and the extension portion 11 will also extend to overcome the shrinkage of the accommodating groove, thereby limiting the degree of thermal expansion of the entire cable. The extended extension portion 11 will drive the upper concave plate 311 and the lower concave plate 312 to move away from each other, causing the lower concave plate 312 to move to fit the heat-conducting ring 4, which is the first working position, thereby To conduct heat, when working at low temperature, the composite support strip 31 shrinks as the temperature of the cable decreases. At this time, the upper concave plate 311 and the lower concave plate 312 will slide against each other as they shrink, expand the accommodating groove, and pull the extension portion 11. As the extension portion 11 is pulled, the thickness decreases, so that the upper concave plate 311 and the lower concave plate 312 approach each other. At the same time, the lower concave plate 312 slides along the limiting filling block 34, thereby moving away from the rubber layer 21, so that the lower concave plate 312 moves away from the rubber layer 21, which is the second workstation, so as to reduce the thermal conductivity of the conductor core 2.

[0035] Furthermore, a filling arc block 35 is arranged between two composite support strips 31 along the inner side of the cavity layer, and a limiting filling block 34 is arranged between the two filling arc blocks 35 . The filling arc block 35 expands and contracts as the outer cover rubber layer 1 expands and contracts.

[0036] Specifically, the filling arc block 35 is arranged on the rubber layer 21 to fill the cavity between the rubber layer 21 and the outer jacket rubber layer 1 that are not covered by the composite support strip 31, and is fixed between the outer jacket rubber layer 1 and the rubber layer 21. The limiting filling block 34 is arranged between two adjacent filling arc blocks 35. When the conductor core 2, the rubber layer 21 and the outer jacket rubber layer 1 stretch or shrink due to thermal expansion and contraction, the filling arc block 35 will be driven to move together, so that during thermal expansion and stretching, the limiting filling block 34 will not hinder the composite support strip 31, and when shrinking, the distance between the two lower concave plates 312 is reduced for guidance.

[0037] Furthermore, support columns 351 are arranged in a linear array on the filling arc block 35 , and the support columns 351 are arranged in the outer jacket rubber layer 1 .

[0038] Specifically, support columns 351 are arranged in a linear array on the filling arc block 35, and the support columns 351 are arranged in the outer jacket rubber layer 1 to increase the connection between the filling arc block 35 and the outer jacket rubber layer 1, avoid the filling arc block 35 and the outer jacket rubber layer 1 from detaching, and assist the outer jacket rubber layer 1 to move together with the filling arc block 35 during thermal expansion and contraction.

[0039] After the cable is installed and in a high-temperature working environment, the conductor core 2, the rubber layer 21 and the outer jacket rubber layer 1 will expand thermally, causing the cable to extend. At this time, the upper concave plate 311 and the lower concave plate 312 will slide against each other as they extend, driving the accommodating groove to shrink, and the extension portion 11 will also extend to overcome the shrinkage of the accommodating groove, thereby limiting the degree of thermal expansion of the entire cable. The extended extension portion 11 will drive the upper concave plate 311 and the lower concave plate 312 to move away from each other, causing the lower concave plate 312 to move to fit the heat-conducting ring 4, which is the first working position, thereby To conduct heat, when working at low temperature, the composite support strip 31 shrinks as the temperature of the cable decreases. At this time, the upper concave plate 311 and the lower concave plate 312 will slide against each other as they shrink, expand the accommodating groove, and pull the extension portion 11. As the extension portion 11 is pulled, the thickness decreases, so that the upper concave plate 311 and the lower concave plate 312 approach each other. At the same time, the lower concave plate 312 slides along the limiting filling block 34, thereby moving away from the rubber layer 21, so that the lower concave plate 312 moves away from the rubber layer 21, which is the second workstation, so as to reduce the thermal conductivity of the conductor core 2.

[0040] As the best embodiment provided by the present invention, both ends of the upper concave plate 311 and the lower concave plate 312 are provided with sliding plates 32 , and the length of the sliding plates 32 on the upper concave plate 311 is shorter than that of the sliding plates 32 on the lower concave plate 312 .

[0041] Specifically, both ends of the upper concave plate 311 and the lower concave plate 312 are provided with slides 32, and the length of the slide 32 on the upper concave plate 311 is less than the length of the slide 32 on the lower concave plate 312. Figure 5 As shown, the receiving groove formed by the upper concave plate 311 and the lower concave plate 312 and facing the outer rubber layer 1 has an opening, so that when the outer rubber layer 1 is extruded by the extruder, it can be squeezed into the receiving groove with pressure to form an extension portion 11, and when it expands and contracts due to heat, the longer sliding piece 32 on the lower concave plate 312 can slide against the upper concave plate 311.

[0042] After the cable is installed and in a high-temperature working environment, the conductor core 2, the rubber layer 21 and the outer jacket rubber layer 1 will expand thermally, causing the cable to extend. At this time, the upper concave plate 311 and the lower concave plate 312 will slide against each other through the slide 32 as they extend, driving the accommodating groove to shrink, and the extension portion 11 will also extend to overcome the shrinkage of the accommodating groove, thereby limiting the degree of thermal expansion of the entire cable, and the extended extension portion 11 will drive the upper concave plate 311 and the lower concave plate 312 to move away from each other, causing the lower concave plate 312 to move to fit the heat-conducting ring 4, which is the first working position, thereby To conduct heat, when working at low temperature, the composite support strip 31 shrinks as the temperature of the cable decreases. At this time, as the upper concave plate 311 and the lower concave plate 312 shrink, they will slide against each other through the slide 32, expand the accommodating groove, and pull the extension part 11. As the extension part 11 is pulled, the thickness decreases, so that the upper concave plate 311 and the lower concave plate 312 approach each other. At the same time, the lower concave plate 312 slides along the limiting filling block 34, thereby moving away from the rubber layer 21, so that the lower concave plate 312 moves away from the rubber layer 21, which is the second workstation, so as to reduce the thermal conductivity of the conductor core 2.

[0043] Furthermore, silicone strips 36 are symmetrically arranged in the cavity layer, and the two silicone strips 36 are pushed and separated by the lower concave plate 312 .

[0044] Specifically, Figure 1 For reference, the silicone strip 36 is set in the cavity compartment, that is, Figure 5 Between the middle and lower concave plates 312 and the rubber layer 21, the silicone strip 36 is used to fill the cavity, which not only has a heat preservation effect, but also can increase the cable's anti-puncture ability. When the lower concave plate 312 moves to fit the thermally conductive ring 4, that is, when it is the first working position, the silicone strip 36 is squeezed open, so that the lower concave plate 312 moves to fit the thermally conductive ring 4 for heat dissipation. When the lower concave plate 312 moves away from the rubber layer 21, that is, when it is the second working position, the silicone strip 36 rebounds and fills the cavity again.

[0045] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A corrosion-resistant solar photovoltaic cable, characterized in that: They include: A conductor core (2) having a rubber layer (21) sleeved thereon, and an outer jacket rubber layer (1) sleeved thereon the rubber layer (21); The tensile mechanism (3) comprises composite support bars (31) arranged in a circumferential array between the rubber layer (21) and the outer rubber layer (1), the composite support bars (31) being provided with a receiving groove, the outer rubber layer (1) being provided with an extension portion (11), the extension portion (11) being arranged in the receiving groove, wherein: The accommodating groove shortens as the composite support strip (31) extends, so as to squeeze the extension portion (11).

2. A corrosion-resistant solar photovoltaic cable according to claim 1, characterized in that: The composite support strip (31) comprises an upper concave plate (311) and a lower concave plate (312) arranged in a linear array, and the concave surfaces of the upper concave plate (311) and the lower concave plate (312) are arranged facing each other in an alternating manner to form the accommodating groove on the lower concave plate (312).

3. A corrosion-resistant solar photovoltaic cable according to claim 2, characterized in that: A cavity layer is provided between the composite support strip (31) and the rubber layer (21), and the composite support strip (31) is switched between the following two positions: First workstation: the composite support strip (31) stretches as the temperature rises, so as to drive the upper concave plate (311) and the lower concave plate (312) to move alternately to extrude the extension portion (11), and to move the lower concave plate (312) to fit the rubber layer (21); Second workstation: the composite support strip (31) shrinks as the temperature decreases, so as to drive the upper concave plate (311) and the lower concave plate (312) to move alternately to pull the extension portion (11), and to move the lower concave plate (312) away from the rubber layer (21).

4. A corrosion-resistant solar photovoltaic cable according to claim 3, characterized in that: A heat-conducting ring (4) is provided on the rubber layer (21), and the composite support strip (31) switches with the first workstation so that the lower concave plate (312) fits the heat-conducting ring (4).

5. The corrosion-resistant solar photovoltaic cable according to claim 3, characterized in that: A limiting filling block (34) is provided between the two lower concave plates (312), and the lower concave plate (312) moves as the outer rubber layer (1) contracts, so as to drive the lower concave plate (312) to slide along the limiting filling block (34) and approach the outer rubber layer (1).

6. A corrosion-resistant solar photovoltaic cable according to claim 5, characterized in that: A filling arc block (35) is arranged between two of the composite support strips (31) along the inner side of the cavity layer, the limiting filling block (34) is arranged between the two filling arc blocks (35), and the filling arc block (35) expands and contracts as the outer cover rubber layer (1) expands and contracts.

7. The corrosion-resistant solar photovoltaic cable according to claim 1, characterized in that: Support columns (351) are arranged in a linear array on the filling arc block (35), and the support columns (351) are arranged in the outer jacket rubber layer (1).

8. The corrosion-resistant solar photovoltaic cable according to claim 3, characterized in that: Slide plates (32) are provided at both ends of the upper concave plate (311) and the lower concave plate (312); the length of the slide plate (32) on the upper concave plate (311) is shorter than the length of the slide plate (32) on the lower concave plate (312).

9. The corrosion-resistant solar photovoltaic cable according to claim 3, characterized in that: Silicone strips (36) are symmetrically arranged in the cavity layer, and two of the silicone strips (36) are pushed apart by the lower concave plate (312).

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