Cable for photovoltaic system

Abstract

The invention relates to the technical field of photovoltaic cables, and particularly discloses a cable for a photovoltaic system, which comprises conductors, the conductors are mutually twisted, a surrounding mechanism is arranged outside the conductors, a supporting heat conduction assembly for heat diffusion is arranged outside the conductors, and the supporting heat conduction assembly is embedded in the surrounding mechanism. An inner auxiliary mechanism is arranged on the periphery of the surrounding mechanism. Through mutual cooperation of the supporting heat conduction assembly, the inner auxiliary mechanism and the outer auxiliary mechanism, heat can still be diffused when the exterior of the cable is damaged, so that the risk can be reduced, the safety can be improved, heat can be gradually diffused layer by layer during heat diffusion, heat is prevented from being accumulated around the wear-resistant layer, the heat dissipation area is enlarged, the heat dissipation efficiency is improved, and the service life of the cable is prolonged. And when the cable is not damaged and needs to be bent, more space can be reserved through compression, so that the bending radian and deformation required by the conductor are reduced, the metal fatigue is reduced, and the service lives of the conductor and the cable are prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic cables, and in particular relates to a cable for a photovoltaic system. Background Art

[0002] Photovoltaic system cables are important transmission media that connect key components such as photovoltaic modules, inverters, junction boxes and power grids, and play a vital role in photovoltaic power generation systems. This type of cable has specific design and performance requirements to adapt to complex and changeable outdoor environmental conditions, such as high temperature, ultraviolet radiation, moisture and chemical corrosion. Photovoltaic cables usually adopt a double-layer insulation design. The inner insulation material has excellent weather resistance and aging resistance, and the outer layer uses UV-resistant, flame-retardant and wear-resistant sheath materials to ensure long-term safe and reliable power transmission. In addition, photovoltaic cables must also have good electrical properties, including high conductivity, low resistance and excellent voltage resistance to reduce energy loss and improve system efficiency.

[0003] In the Chinese patent with the publication number CN118197701A, a long-life cable for photovoltaic system is mentioned, including a cable core, a heat dissipation structure arranged outside the cable core, and an outer sheath layer arranged outside the heat dissipation structure; the cable core includes a reinforcing member and a plurality of cable units arranged in the reinforcing member; the reinforcing member includes a plurality of tightly connected hollow tubes, and the cable units are inserted in the hollow tubes; the heat dissipation structure includes a micro heat dissipation component and a heat conductive layer; the micro heat dissipation component is arranged at the connection position of two adjacent hollow tubes, and the heat conductive layer includes an integrally formed first sheath layer and a second sheath layer; the first sheath layer is sleeved on the outer wall of the reinforcing member and fits with the micro heat dissipation component, and the second sheath layer is a circular tube, and the first sheath layer and the second sheath layer are filled with heat conductive silica gel. Through the optimized design of structure and materials, it has excellent heat dissipation performance, thermal conductivity and weather resistance, and can extend the service life of photovoltaic cables.

[0004] When the above-mentioned equipment is in use, although the internal heat dissipation structure can ensure the stability of the cable structure and the continuity of the micro heat dissipation channels, the continuous heat dissipation channels also bring certain risks. If the cable is externally damaged or aged during use, these heat dissipation channels may become a path for the intrusion of impurities such as moisture and dust, thereby posing a threat to the electrical performance and safety of the cable. Summary of the invention

[0005] The purpose of the present invention is to provide a cable for a photovoltaic system to solve the problems existing in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A photovoltaic system cable comprises a conductor, the conductors are twisted with each other, a surrounding mechanism is arranged outside the conductor, a heat diffusion supporting heat conducting component is arranged outside the conductor, the supporting heat conducting component is embedded inside the surrounding mechanism, an inner auxiliary mechanism is arranged outside the surrounding mechanism, and an outer auxiliary mechanism is arranged outside the inner auxiliary mechanism; the surrounding mechanism comprises a filler and an insulating layer, and the surrounding mechanism is used to protect the conductor; the supporting heat conducting component comprises an arc guide piece and a middle guide piece, the supporting heat conducting component is evenly and equidistantly distributed inside the filler, and the outer side of the arc guide piece is attached to the inner side of the filler. The outer wall of the conductor, the supporting heat-conducting component cooperates with the internal auxiliary mechanism and the external auxiliary mechanism for heat diffusion, and the supporting heat-conducting component is also used to strengthen the supporting conductor; the internal auxiliary mechanism includes an inner wear-resistant layer and an inner folding sleeve, the inner folding sleeve is evenly and equidistantly embedded on the inner side of the inner wear-resistant layer, and the inner side of the inner folding sleeve is in contact with the insulating layer; the external auxiliary mechanism includes multiple outer wear-resistant layers and an outer folding sleeve, the outer wear-resistant layers are evenly arranged and fixedly connected, and the outer folding sleeves are all sleeved on the periphery of the outer wear-resistant layer; the outer auxiliary mechanism and the inner auxiliary mechanism are used to reduce the bending curvature of the conductor, and the outer auxiliary mechanism and the inner auxiliary mechanism are also used to improve the torsion resistance.

[0008] Preferably: the filler is located on the inner side of the arc guide piece, and both ends of the middle guide piece are provided with inclined support guide pieces and three side guide pieces, one end of the support guide piece and the side guide piece are fixedly connected to the middle guide piece, and the other ends of the support guide piece and the side guide piece are fixedly connected to the inner side of the arc guide piece.

[0009] Preferably: the outer periphery of the outer wear-resistant layer is provided with outer spiral grooves evenly distributed around it, the outer wear-resistant layer is provided with spiral protrusions between the multiple outer spiral grooves, the spiral protrusions are provided with outer ring grooves, the outer folding sleeve is connected to the inner part of the outer ring groove, the multiple outer wear-resistant layers are staggered with each other, and the outer spiral grooves are staggered with each other.

[0010] Preferably, the inner side of the inner wear-resistant layer is provided with continuous thread grooves evenly distributed around, the inner wear-resistant layer is provided with continuous protrusions at the intervals between the continuous thread grooves, the inner sides of the continuous protrusions are provided with inner ring grooves, and the inner folding sleeve is embedded in the inner ring grooves.

[0011] Preferably, the outer folding sleeve and the supporting heat-conducting component are both located at the staggered gap between the two inner folding sleeves, and the supporting heat-conducting component, the inner folding sleeve and the outer folding sleeve are located in different layers and staggered with each other.

[0012] Preferably, the filler is filled inside the insulating layer, and a thin groove is provided at the end of the insulating layer supporting the heat-conducting component.

[0013] Preferably, the outer annular groove is connected to the outer spiral groove, and the bottom surface of the outer spiral groove is located below the bottom surface of the outer annular groove.

[0014] Preferably, the continuous thread groove is connected to the inner ring groove, and the bottom surface of the continuous thread groove is located below the bottom surface of the inner ring groove.

[0015] Preferably, annular grooves are formed inside and outside the outer folding sleeve and the inner folding sleeve.

[0016] Preferably, the periphery of the external auxiliary mechanism is provided with a shielding layer, a waterproof layer, a flame retardant layer and a wear-resistant layer in sequence from the inside to the outside.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention cooperates with the supporting heat-conducting components, internal auxiliary mechanisms and external auxiliary mechanisms. When the wear-resistant layer, flame-retardant layer, waterproof layer and shielding layer on the outside of the cable are damaged, the internal supporting heat-conducting components can still absorb heat, dissipate heat and support the conductor, and gradually dissipate heat indirectly to the internal folding sleeve and the external folding sleeve, while the damaged part cannot directly contact the supporting heat-conducting components, thereby reducing risks and improving safety.

[0019] 2. In the present invention, through the cooperation of the supporting heat-conducting component, the internal auxiliary mechanism and the external auxiliary mechanism, the heat generated by the conductor when electricity passes through will be indirectly transferred to the supporting heat-conducting component, and then indirectly transferred by the supporting heat-conducting component to the inner folding sleeve and the outer folding sleeve and the internal space of the continuous thread groove and the outer spiral groove, thereby avoiding heat accumulation around the wear-resistant layer, expanding the heat dissipation area, and improving the heat dissipation efficiency.

[0020] 3. The present invention cooperates with the supporting heat-conducting components, the internal auxiliary mechanism and the external auxiliary mechanism. When the cable needs to be bent, the outer folding sleeve and the inner folding sleeve will be deformed and the space inside the continuous thread groove and the outer spiral groove will be compressed to reserve more space, thereby reducing the bending curvature and deformation required for the conductor, reducing metal fatigue, and extending the service life of the conductor and the cable.

[0021] 4. The present invention cooperates with the supporting heat-conducting components, the internal auxiliary mechanism and the external auxiliary mechanism. When the cable is twisted in the direction, the outer spiral grooves opened on the outer periphery of the outer wear-resistant layer and the continuous thread grooves opened on the inner side of the inner wear-resistant layer will generate resistance, thereby absorbing and dispersing the torsional force through deformation and extrusion, thereby protecting the internal structure of the cable from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 One of the three-dimensional diagrams of the present invention as a whole;

[0023] Figure 2 It is a schematic diagram of the side cross-sectional structure of the present invention as a whole;

[0024] Figure 3It is a structural schematic diagram of the surrounding mechanism of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the heat-conducting component supporting the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the external auxiliary mechanism and the internal auxiliary mechanism of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the external auxiliary mechanism of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the auxiliary mechanism in the present invention;

[0029] Figure 8 It is a schematic diagram of the structure of the outer folding sleeve and the inner folding sleeve of the present invention.

[0030] In the figure:

[0031] 1. Wear-resistant layer; 2. Flame-retardant layer; 3. Waterproof layer; 4. Shielding layer;

[0032] 5. External auxiliary mechanism; 51. External flame retardant layer; 52. External folding sleeve; 53. External spiral groove; 54. Spiral protrusion; 55. External ring groove;

[0033] 6. Internal auxiliary mechanism; 61. Internal flame retardant layer; 62. Internal folding sleeve; 63. Continuous thread groove; 64. Continuous protrusion; 65. Internal ring groove;

[0034] 7. surrounding mechanism; 71. filler; 72. insulating layer; 73. supporting heat-conducting component; 731. middle guide; 732. arc guide; 733. supporting guide; 734. side guide; 74. thin groove;

[0035] 8. Conductor. DETAILED DESCRIPTION

[0036] 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.

[0037] Reference Figure 1-Figure 8 As shown, the present invention provides a photovoltaic system cable, including a conductor 8, the conductor 8 is twisted with each other, a surrounding mechanism 7 is arranged outside the conductor 8, a heat diffusion supporting heat conducting component 73 is arranged outside the conductor 8, the supporting heat conducting component 73 is embedded inside the surrounding mechanism 7, an inner auxiliary mechanism 6 is arranged outside the surrounding mechanism 7, and an outer auxiliary mechanism 5 is arranged outside the inner auxiliary mechanism 6;

[0038] The surrounding mechanism 7 includes a filler 71 and an insulating layer 72, and the surrounding mechanism 7 is used to protect the conductor 8;

[0039] The supporting heat-conducting component 73 includes an arc guide piece 732 and a middle guide piece 731. The supporting heat-conducting component 73 is evenly and equidistantly distributed inside the filler 71. The outer side of the arc guide piece 732 fits the outer wall of the conductor 8. The supporting heat-conducting component 73 cooperates with the inner auxiliary mechanism 6 and the outer auxiliary mechanism 5 for heat diffusion. The supporting heat-conducting component 73 is also used to strengthen the supporting conductor 8.

[0040] The inner auxiliary mechanism 6 comprises an inner wear-resistant layer 61 and an inner folding sleeve 62. The inner folding sleeve 62 is evenly and equidistantly embedded inside the inner wear-resistant layer 61. The inner side of the inner folding sleeve 62 is in contact with the insulating layer 72.

[0041] The external auxiliary mechanism 5 includes a plurality of external wear-resistant layers 51 and external folding sleeves 52. The external wear-resistant layers 51 are evenly arranged and fixedly connected, and the external folding sleeves 52 are all sleeved on the periphery of the external wear-resistant layers 51.

[0042] The outer auxiliary mechanism 5 and the inner auxiliary mechanism 6 are used to reduce the bending curvature of the conductor 8 . The outer auxiliary mechanism 5 and the inner auxiliary mechanism 6 are also used to improve the torsion resistance.

[0043] Reference Figure 3-Figure 4 In a further embodiment, the filler 71 is located on the inner side of the arc guide piece 732, and both ends of the middle guide piece 731 are provided with inclined support guide pieces 733 and three side guide pieces 734, one end of the support guide piece 733 and the side guide piece 734 are fixedly connected to the middle guide piece 731, and the other ends of the support guide piece 733 and the side guide piece 734 are fixedly connected to the inner side of the arc guide piece 732.

[0044] In this embodiment, the supporting heat-conducting component 73 is entirely made of heat-conducting metal material and has a certain toughness, so as to match the torsion of the three conductors 8;

[0045] When the wear-resistant layer 1, the flame-retardant layer 2, the waterproof layer 3 and the shielding layer 4 on the outside of the cable are damaged, the internal support heat-conducting component 73 can still absorb heat, dissipate heat and support the conductor 8, and gradually dissipate heat indirectly to the external inner folding sleeve 62 and the outer folding sleeve 52, while the damaged part cannot directly contact the support heat-conducting component 73, thereby reducing risks and improving safety;

[0046] When the outside of the cable is not damaged, the heat generated by the conductor 8 when electricity passes through it will be indirectly transferred to the arc guide 732, and then conducted to the middle guide 731 by the side guide 734 and the support guide 733. The heat is then conducted from the thin groove 74 at the insertion point of the middle guide 731 to the inner folding sleeve 62 and the continuous thread groove 63 on the periphery, and then conducted by the inner wear-resistant layer 61 to the air in the outer spiral groove 53 and the outer folding sleeve 52 in the outer ring groove 55, completing the heat dissipation, thereby avoiding heat dissipation only around the conductor 8, expanding the heat dissipation area, and improving the heat dissipation efficiency.

[0047] Reference Figure 5-Figure 8 In a further embodiment, the outer periphery of the outer wear-resistant layer 51 is provided with outer spiral grooves 53 that are evenly distributed around, the outer wear-resistant layer 51 is provided with spiral protrusions 54 between the multiple outer spiral grooves 53, the spiral protrusions 54 are provided with outer ring grooves 55, the outer folding sleeve 52 is sleeved inside the outer ring groove 55, the multiple outer wear-resistant layers 51 are staggered with each other, and the outer spiral grooves 53 are staggered with each other.

[0048] There are multiple outer wear-resistant layers 51 which are connected end to end, but the first spiral protrusion 54 blocks the end of the second outer spiral groove 53 .

[0049] The inner side of the inner wear-resistant layer 61 is provided with continuous thread grooves 63 which are evenly distributed around the inner side. The inner wear-resistant layer 61 is provided with continuous protrusions 64 at the intervals between the continuous thread grooves 63. The inner sides of the continuous protrusions 64 are provided with inner annular grooves 65. The inner folding sleeve 62 is embedded in the inner annular grooves 65.

[0050] The outer folding sleeve 52 and the supporting heat-conducting component 73 are both located at the staggered gap between the two inner folding sleeves 62, and the supporting heat-conducting component 73, the inner folding sleeve 62 and the outer folding sleeve 52 are in different layers and staggered with each other;

[0051] The filler 71 is filled inside the insulating layer 72 , and a thin groove 74 is formed at the end of the insulating layer 72 supporting the heat-conducting component 73 .

[0052] The filler 71 is an insulating material; the thin groove 74 can better transfer heat.

[0053] The outer annular groove 55 is connected to the outer spiral groove 53 , and the bottom surface of the outer spiral groove 53 is located below the bottom surface of the outer annular groove 55 ; the continuous thread groove 63 is connected to the inner annular groove 65 , and the bottom surface of the continuous thread groove 63 is located below the bottom surface of the inner annular groove 65 .

[0054] In this embodiment, air is retained on the inner sides of the outer spiral groove 53 and the continuous thread groove 63 during the production process to dissipate heat. In addition, the connection between the outer spiral groove 53 and the outer ring groove 55, and the connection between the continuous thread groove 63 and the inner ring groove 65 can compress the internal space when the entire cable is subjected to bending force, so that the inner wear-resistant layer 61 and the outer wear-resistant layer 51 at the bending part of the cable have different curvatures, thereby reserving space so that the conductor 8 can have a smaller bending arc when bent.

[0055] Annular grooves are formed inside and outside the outer folding sleeve 52 and the inner folding sleeve 62 .

[0056] In this embodiment, the outer folding sleeve 52 and the inner folding sleeve 62 are made of the same material as the supporting heat-conducting component 73 and have a certain heat diffusion function. The annular grooves provided in the two allow one side of the two sides to accept deformation and the other side to accept expansion. In addition, the outer folding sleeve 52 is wider than the inner folding sleeve 62, thereby further increasing the heat dissipation surface.

[0057] When the cable needs to be bent, the outer folding sleeve 52 or the inner folding sleeve 62 on the inner side of the bending portion will shrink inward, while the outer side of the bending portion will expand, and at the same time, the inner wear-resistant layer 61 and the outer wear-resistant layer 51 will be squeezed to deform, so that the internal space of the continuous thread groove 63 and the outer spiral groove 53 is compressed, thereby reserving more space so that when the conductor 8 with multiple strands twisted together inside is bent, the bending arc required for the conductor 8 to deform will be reduced, so that the deformation of the conductor 8 will also become smaller, reducing the metal fatigue of the conductor 8, thereby increasing the service life of the conductor 8 and improving the bendability of the entire cable;

[0058] When the cable is twisted in direction, the outer spiral groove 53 opened on the outer periphery of the outer wear-resistant layer 51 and the continuous thread groove 63 opened on the inner side of the inner wear-resistant layer 61 will generate resistance, thereby absorbing and dispersing the torsional force through deformation and extrusion, thereby protecting the internal structure of the cable from damage.

[0059] Reference Figure 1-Figure 2 In a further embodiment, the periphery of the external auxiliary mechanism 5 is provided with a shielding layer 4, a waterproof layer 3, a flame retardant layer 2 and a wear-resistant layer 1 in sequence from the inside to the outside.

[0060] In this embodiment, the wear-resistant layer 1, the flame-retardant layer 2, the waterproof layer 3, the shielding layer 4, the outer wear-resistant layer 51, the inner wear-resistant layer 61, the insulating layer 72, the filler 71 and the conductor 8 are all protective layers of the cable in the prior art.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic system cable, comprising a conductor (8), characterized in that: The conductors (8) are twisted with each other, a surrounding mechanism (7) is arranged outside the conductor (8), a heat diffusion supporting heat-conducting component (73) is arranged outside the conductor (8), the supporting heat-conducting component (73) is embedded inside the surrounding mechanism (7), an inner auxiliary mechanism (6) is arranged outside the surrounding mechanism (7), and an outer auxiliary mechanism (5) is arranged outside the inner auxiliary mechanism (6); The surrounding mechanism (7) comprises a filler (71) and an insulating layer (72), and the surrounding mechanism (7) is used to protect the conductor (8); The support heat-conducting component (73) comprises an arc guide piece (732) and a middle guide piece (731); the support heat-conducting component (73) is evenly and equidistantly distributed inside the filler (71); the outer side of the arc guide piece (732) is in contact with the outer wall of the conductor (8); the support heat-conducting component (73) cooperates with the inner auxiliary mechanism (6) and the outer auxiliary mechanism (5) for heat diffusion; the support heat-conducting component (73) is also used to strengthen the support conductor (8); The inner auxiliary mechanism (6) comprises an inner wear-resistant layer (61) and an inner folding sleeve (62), wherein the inner folding sleeve (62) is evenly and equidistantly embedded inside the inner wear-resistant layer (61), and the inner side of the inner folding sleeve (62) is in contact with the insulating layer (72); The external auxiliary mechanism (5) comprises a plurality of external wear-resistant layers (51) and external folding sleeves (52), wherein the external wear-resistant layers (51) are evenly arranged and fixedly connected, and the external folding sleeves (52) are all sleeved on the periphery of the external wear-resistant layers (51); The outer auxiliary mechanism (5) and the inner auxiliary mechanism (6) are used to reduce the bending curvature of the conductor (8), and the outer auxiliary mechanism (5) and the inner auxiliary mechanism (6) are also used to improve the anti-torsion.

2. A photovoltaic system cable according to claim 1, characterized in that: The filler (71) is located on the inner side of the arc guide piece (732), and both ends of the middle guide piece (731) are provided with inclined support guide pieces (733) and three side guide pieces (734), one end of the support guide piece (733) and the side guide piece (734) are fixedly connected to the middle guide piece (731), and the other ends of the support guide piece (733) and the side guide piece (734) are fixedly connected to the inner side of the arc guide piece (732).

3. A photovoltaic system cable according to claim 1, characterized in that: The outer wear-resistant layer (51) is provided with outer spiral grooves (53) evenly distributed around the outer periphery, the outer wear-resistant layer (51) is provided with spiral protrusions (54) between the plurality of outer spiral grooves (53), the spiral protrusions (54) are provided with outer annular grooves (55), the outer folding sleeve (52) is sleeved inside the outer annular groove (55), the plurality of outer wear-resistant layers (51) are staggered with each other, and the outer spiral grooves (53) are staggered with each other.

4. A photovoltaic system cable according to claim 1, characterized in that: The inner side of the inner wear-resistant layer (61) is provided with continuous thread grooves (63) which are evenly distributed around the inner side. The inner wear-resistant layer (61) is provided with continuous protrusions (64) at the intervals between the continuous thread grooves (63). The inner side of the continuous protrusions (64) is provided with inner annular grooves (65). The inner folding sleeve (62) is embedded in the inner annular groove (65).

5. A photovoltaic system cable according to claim 1, characterized in that: The outer folding sleeve (52) and the supporting heat-conducting component (73) are both located at the staggered gap between the two inner folding sleeves (62); the supporting heat-conducting component (73), the inner folding sleeve (62) and the outer folding sleeve (52) are located at different layers and are staggered with each other.

6. A photovoltaic system cable according to claim 1, characterized in that: The filler (71) is filled inside the insulating layer (72), and a thin groove (74) is provided at the end of the insulating layer (72) supporting the heat-conducting component (73).

7. A photovoltaic system cable according to claim 3, characterized in that: The outer annular groove (55) is connected to the outer spiral groove (53), and the bottom surface of the outer spiral groove (53) is located below the bottom surface of the outer annular groove (55).

8. A photovoltaic system cable according to claim 4, characterized in that: The continuous thread groove (63) is connected to the inner ring groove (65), and the bottom surface of the continuous thread groove (63) is located below the bottom surface of the inner ring groove (65).

9. A photovoltaic system cable according to claim 1, characterized in that: Annular grooves are provided inside and outside the outer folding sleeve (52) and the inner folding sleeve (62).

10. A photovoltaic system cable according to claim 1, characterized in that: The periphery of the external auxiliary mechanism (5) is provided with a shielding layer (4), a waterproof layer (3), a flame retardant layer (2) and a wear-resistant layer (1) in sequence from the inside to the outside.

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