A cable for a photovoltaic system

Abstract

The present invention relates to the technical field of photovoltaic cables, and specifically discloses a cable for a photovoltaic system, which includes a conductor. The conductors are twisted with each other. An enclosing mechanism is arranged outside the conductor. A support heat conduction component for heat diffusion is arranged outside the conductor. The support heat conduction component is embedded inside the enclosing mechanism. An inner auxiliary mechanism is arranged on the periphery of the enclosing mechanism. Through the mutual cooperation of the provided support heat conduction component, inner auxiliary mechanism and outer auxiliary mechanism, heat can still be diffused when the outside of the cable is damaged, thereby reducing risks and improving safety. Moreover, when heat is diffused, it can gradually diffuse layer by layer outward, avoiding the accumulation of heat around the wear-resistant layer, expanding the heat dissipation area and improving the heat dissipation efficiency. When the cable needs to be bent without damage, more space can be reserved by compression, thereby reducing the bending arc and deformation required for the conductor, reducing metal fatigue and prolonging the service life of the conductor and the cable.

Description

Technical Field

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

[0002] The cable for a photovoltaic system is an important transmission medium connecting key components such as photovoltaic modules, inverters, busbar boxes, and the power grid, and plays a crucial role in a photovoltaic power generation system. Such cables have specific design and performance requirements to adapt to complex and changeable outdoor environmental conditions, such as high temperature, ultraviolet radiation, humidity, 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 a sheath material with anti-ultraviolet, flame-retardant, and wear-resistant properties to ensure long-term safe and reliable power transmission. In addition, photovoltaic cables also need to have good electrical properties, including high conductivity, low resistance, and excellent withstand voltage ability, to reduce energy loss and improve system efficiency.

[0003] In the Chinese patent with the publication number CN118197701A, a high-life cable for a photovoltaic system is mentioned, which includes 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 strengthening member and a plurality of cable units arranged inside the strengthening member; the strengthening member includes a plurality of tightly connected hollow tube bodies, and the cable units are arranged inside the hollow tube bodies; the heat dissipation structure includes a micro heat dissipation component and a heat conduction layer; the micro heat dissipation component is arranged at the connection position between two adjacent hollow tube bodies, and the heat conduction 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 strengthening member and is in contact with the micro heat dissipation component, the second sheath layer is a circular tube body, and heat conduction silica gel is filled between the first sheath layer and the second sheath layer. Through the optimized design of the structure and materials, it has excellent heat dissipation performance, heat conduction performance, and weather resistance, and can extend the service life of the photovoltaic cable.

[0004] When the above equipment is in use, although the stability of the cable structure and the continuity of the micro heat dissipation channels can be achieved through the internal heat dissipation structure, the continuous heat dissipation channels also bring certain risks. If the cable is damaged or aged externally during use, these heat dissipation channels may become paths for impurities such as moisture and dust to invade, thereby threatening the electrical performance and safety inside 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 purpose, the present invention provides the following technical solutions:

[0007] A cable for a photovoltaic system, comprising a conductor, the conductors are twisted with each other, an enclosing mechanism is arranged outside the conductor, a support heat conduction assembly for heat diffusion is arranged outside the conductor, the support heat conduction assembly is embedded inside the enclosing mechanism, an inner auxiliary mechanism is arranged outside the enclosing mechanism, and an outer auxiliary mechanism is arranged outside the inner auxiliary mechanism; the enclosing mechanism includes a filler and an insulating layer, and the enclosing mechanism is used to protect the conductor; the support heat conduction assembly includes arc-shaped guide pieces and middle guide pieces, the support heat conduction assembly is evenly and equidistantly distributed inside the filler, the outer side of the arc-shaped guide piece fits the outer wall of the conductor, the support heat conduction assembly cooperates with the inner auxiliary mechanism and the outer auxiliary mechanism for heat diffusion, and the support heat conduction assembly is also used to strengthen the support of the conductor; the inner auxiliary mechanism includes an inner wear-resistant layer and an inner folding sleeve, the inner folding sleeve is evenly and equidistantly embedded inside the inner wear-resistant layer, and the inner side of the inner folding sleeve fits the insulating layer; the outer auxiliary mechanism includes a plurality of 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 outside the outer wear-resistant layers; the outer auxiliary mechanism and the inner auxiliary mechanism are used to reduce the bending radian of the conductor, and the outer auxiliary mechanism and the inner auxiliary mechanism are also used to improve anti-torsion.

[0008] Preferably: The filler is located inside the arc-shaped guide piece, and inclined support guide pieces and three side guide pieces are arranged at both ends of the middle guide piece. One end of the support guide piece and the side guide piece are fixedly connected to the middle guide piece, and the other end of the support guide piece and the side guide piece are fixedly connected to the inner side of the arc-shaped guide piece.

[0009] Preferably: Uniformly distributed outer spiral grooves are formed on the outer periphery of the outer wear-resistant layer. Spiral protrusions are arranged between the outer wear-resistant layers. Outer ring grooves are formed in the spiral protrusions. The outer folding sleeve is sleeved inside the outer ring grooves. The plurality of outer wear-resistant layers are staggered from each other, and the outer spiral grooves are staggered from each other.

[0010] Preferably: Uniformly distributed continuous thread grooves are formed on the inner side of the inner wear-resistant layer. Continuous protrusions are arranged at intervals of the continuous thread grooves. Inner ring grooves are formed inside the continuous protrusions. The inner folding sleeve is embedded inside the inner ring grooves.

[0011] Preferably: The outer folding sleeve and the support heat conduction assembly are both located at the staggered gaps of the two inner folding sleeves. The support heat conduction assembly, the inner folding sleeve and the outer folding sleeve are in different layers and are staggered from each other.

[0012] Preferably: The filler is filled inside the insulating layer, and a thin groove is formed at the end of the insulating layer where the support heat conduction assembly is located.

[0013] Preferably: The outer ring groove communicates with the outer spiral groove, and the bottom surface of the outer spiral groove is located below the bottom surface of the outer ring groove.

[0014] Preferably, the continuous thread groove communicates with 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 provided both inside and outside the outer folding sleeve and the inner folding sleeve.

[0016] Preferably, a shielding layer, a waterproof layer, a flame retardant layer and a wear-resistant layer are sequentially arranged from inside to outside on the periphery of the outer auxiliary mechanism.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] First, through the mutual cooperation of the set support heat conduction component, inner auxiliary mechanism and outer auxiliary mechanism, when the wear-resistant layer, flame retardant layer, waterproof layer and shielding layer outside the cable are damaged, the internal support heat conduction component can still absorb heat, dissipate heat and support the conductor, and gradually dissipate heat indirectly to the outer inner folding sleeve and outer folding sleeve, while the damaged part cannot directly contact the support heat conduction component, thereby reducing risks and improving safety.

[0019] Second, through the mutual cooperation of the set support heat conduction component, inner auxiliary mechanism and outer auxiliary mechanism, the heat generated when electricity passes through the conductor will be indirectly transferred to the support heat conduction component, and then indirectly transferred to the inner folding sleeve, outer folding sleeve, internal space of the continuous thread groove and outer spiral groove by the support heat conduction component, avoiding the accumulation of heat around the wear-resistant layer, expanding the heat dissipation area and improving the heat dissipation efficiency.

[0020] Third, through the mutual cooperation of the set support heat conduction component, inner auxiliary mechanism and outer auxiliary mechanism, when the cable needs to be bent, the outer folding sleeve and the inner folding sleeve will deform and compress the space inside the continuous thread groove and the outer spiral groove to reserve more space, thereby reducing the bending radian and deformation required by the conductor, reducing metal fatigue and prolonging the service life of the conductor and the cable.

[0021] Fourth, through the mutual cooperation of the set support heat conduction component, inner auxiliary mechanism and outer auxiliary mechanism, when the cable is twisted in the direction of its run, the outer spiral groove provided on the outer periphery of the outer wear-resistant layer and the continuous thread groove provided on the inner side of the inner wear-resistant layer will both generate resistance, thereby absorbing and dispersing the torsional force through deformation and extrusion, so as to protect the internal structure of the cable from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 One of the perspective views of the whole of the present invention;

[0023] Figure 2 The side cross-sectional structure schematic diagram of the whole of the present invention;

[0024] Figure 3Schematic diagram of the surrounding mechanism of the present invention;

[0025] Figure 4 Schematic diagram of the structure for supporting the heat-conducting component of the present invention;

[0026] Figure 5 Schematic diagram of the structure of the outer auxiliary mechanism and the inner auxiliary mechanism of the present invention;

[0027] Figure 6 Schematic diagram of the structure of the outer auxiliary mechanism of the present invention;

[0028] Figure 7 Schematic diagram of the structure of the inner auxiliary mechanism of the present invention;

[0029] Figure 8 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. Outer auxiliary mechanism; 51. Outer wear-resistant layer; 52. Outer folding sleeve; 53. Outer spiral groove; 54. Spiral protrusion; 55. Outer ring groove;

[0033] 6. Inner auxiliary mechanism; 61. Inner wear-resistant layer; 62. Inner folding sleeve; 63. Continuous thread groove; 64. Continuous protrusion; 65. Inner ring groove;

[0034] 7. Surrounding mechanism; 71. Filler; 72. Insulating layer; 73. Structure for supporting heat conduction; 731. Middle guide piece; 732. Arc guide piece; 733. Support guide piece; 734. Side guide piece; 74. Thin groove;

[0035] 8. Conductor. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] Referring to Figures 1-8 as shown, the present invention provides a cable for a photovoltaic system, including a conductor 8, the conductors 8 are twisted with each other, a surrounding mechanism 7 is arranged outside the conductor 8, a structure for supporting heat conduction 73 for heat diffusion is arranged outside the conductor 8, the structure for supporting heat conduction 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. The surrounding mechanism 7 is used to protect the conductor 8;

[0039] The supporting heat-conducting component 73 includes an arc-shaped guide piece 732 and a middle guide piece 731. The supporting heat-conducting components 73 are evenly and equidistantly distributed inside the filler 71. The outer side of the arc-shaped guide piece 732 is attached to 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, and the supporting heat-conducting component 73 is also used to strengthen the support of the conductor 8;

[0040] The inner auxiliary mechanism 6 includes an inner wear-resistant layer 61 and an inner folding sleeve 62. The inner folding sleeves 62 are evenly and equidistantly embedded inside the inner wear-resistant layer 61. The inner side of the inner folding sleeve 62 is attached to the insulating layer 72;

[0041] The outer auxiliary mechanism 5 includes a plurality of outer wear-resistant layers 51 and an outer folding sleeve 52. The outer wear-resistant layers 51 are evenly arranged and fixedly connected. The outer folding sleeves 52 are all sleeved around the outer wear-resistant layers 51;

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

[0043] Referring to Figures 3-4 , in a further embodiment, the filler 71 is located inside the arc-shaped guide piece 732. Inclined support guide pieces 733 and three side guide pieces 734 are provided at both ends of the middle guide piece 731. One ends 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-shaped guide piece 732.

[0044] In this embodiment, the entire supporting heat-conducting component 73 is made of heat-conducting metal material and has a certain toughness, so as to cooperate with the torsion of the three-strand conductor 8;

[0045] When the wear-resistant layer 1, the flame-retardant layer 2, the waterproof layer 3 and the shielding layer 4 outside the cable are damaged, the internal supporting heat-conducting component 73 can still absorb and dissipate heat from the conductor 8 and support it, and gradually conduct indirect heat dissipation to the inner folding sleeve 62 and the outer folding sleeve 52 outside, and the damaged part cannot directly contact the supporting heat-conducting component 73, so as to reduce the risk and improve the safety;

[0046] When there is no damage to the outside of the cable, the heat generated by the conductor 8 when electricity passes through will be indirectly transferred to the arc guide piece 732, and then conducted to the middle guide piece 731 by the side guide piece 734 and the support guide piece 733. After that, the heat is conducted from the thin groove 74 at the insertion part of the middle guide piece 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. This avoids heat dissipation only around the conductor 8, expands the heat dissipation area, and improves the heat dissipation efficiency.

[0047] Referring to Figures 5-8 , in a further embodiment, uniformly distributed outer spiral grooves 53 are formed on the periphery of the outer wear-resistant layer 51. Between the multiple outer spiral grooves 53 of the outer wear-resistant layer 51, spiral protrusions 54 are provided. Outer ring grooves 55 are formed in the spiral protrusions 54. The outer folding sleeve 52 is sleeved inside the outer ring groove 55. The multiple outer wear-resistant layers 51 are staggered from each other, and the outer spiral grooves 53 are staggered from each other.

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

[0049] On the inner side of the inner wear-resistant layer 61, uniformly distributed continuous thread grooves 63 are formed. At the intervals of the continuous thread grooves 63 of the inner wear-resistant layer 61, continuous protrusions 64 are provided. Inner ring grooves 65 are formed inside the continuous protrusions 64. The inner folding sleeve 62 is embedded inside the inner ring groove 65;

[0050] The outer folding sleeve 52 and the support heat conduction assembly 73 are both located at the staggered gaps between the two inner folding sleeves 62. The support heat conduction assembly 73, the inner folding sleeve 62, and the outer folding sleeve 52 are in different layers and are staggered from each other;

[0051] The filler 71 is filled inside the insulating layer 72. At the end of the support heat conduction assembly 73, the insulating layer 72 is provided with a thin groove 74.

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

[0053] The outer ring groove 55 communicates with the outer spiral groove 53, and the bottom surface of the outer spiral groove 53 is below the bottom surface of the outer ring groove 55; the continuous thread groove 63 communicates with the inner ring groove 65, and the bottom surface of the continuous thread groove 63 is below the bottom surface of the inner ring groove 65.

[0054] In this embodiment, air is retained inside both the outer spiral groove 53 and the continuous thread groove 63 during the production process for heat dissipation. Additionally, the connection between the outer spiral groove 53 and the outer ring groove 55, as well as the connection between the continuous thread groove 63 and the inner ring groove 65, allows the entire cable to compress the internal space when subjected to a bending force, resulting in different bending degrees of the inner wear-resistant layer 61 and the outer wear-resistant layer 51 at the bending part of the cable, thereby leaving a space that enables the conductor 8 to have a smaller bending arc when bent.

[0055] Both the inner and outer sides of the outer folding sleeve 52 and the inner folding sleeve 62 are provided with annular grooves.

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

[0057] When the cable needs to be bent, the outer folding sleeve 52 or the inner folding sleeve 62 at the inner side of the bending part will contract inward, while the outer side of the bending part will expand. At the same time, it will also squeeze the inner wear-resistant layer 61 and the outer wear-resistant layer 51 to generate deformation, causing the internal spaces of the continuous thread groove 63 and the outer spiral groove 53 to be compressed. As a result, more space is reserved so that when the multi-strand twisted conductor 8 inside is bent, the bending arc that the conductor 8 needs to deform will be reduced, and thus the deformation generated by 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 subjected to torsional forces in the direction of its run, the outer spiral groove 53 provided on the periphery of the outer wear-resistant layer 51 and the continuous thread groove 63 provided on the inner side of the inner wear-resistant layer 61 will both generate resistance, thereby absorbing and dispersing the torsional forces through deformation and extrusion, thus protecting the internal structure of the cable from damage.

[0059] Refer to Figures 1-2 , in a further embodiment, a shielding layer 4, a waterproof layer 3, a flame-retardant layer 2, and a wear-resistant layer 1 are sequentially arranged from the inside to the outside around the outer auxiliary mechanism 5.

[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. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. 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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