Photovoltaic cable for new energy photovoltaic power station

Abstract

The invention provides a photovoltaic cable for an energy photovoltaic power station, and the cable comprises a center shaft and at least four cable cores, and the cable cores are located on the peripheral side of the center shaft. The multiple separation assemblies are sequentially arranged on the middle shaft in a sleeving mode, and each separation assembly comprises a sleeve arranged on the middle shaft in a sleeving mode; the partition plate is fixed on the outer wall of the sleeve and is inserted between the adjacent cable cores; the photovoltaic cable further comprises a supporting layer which is annularly arranged on the peripheral side of the partition plate, and an air channel is formed between the supporting layer and the middle shaft. The insulating layer is arranged on the outer side of the supporting layer; the power assembly is positioned at one end part of the photovoltaic cable and is communicated with the air duct; and an air outlet communicated with the air duct is formed in the peripheral side of the other end part of the photovoltaic cable. According to the technical scheme, heat generated by the cable cores can be effectively transferred through output of the power assembly, so that the temperature in the multi-core cable is greatly reduced to be constant, and the multi-core cable is in a safe and stable working state.

Description

TECHNICAL FIELD

[0001] The present application generally relates to the field of cables, and in particular to a photovoltaic cable for new energy photovoltaic power stations. BACKGROUND

[0002] With the continuous iteration of new energy photovoltaic power generation technology, the power density of photovoltaic power stations continues to increase, and the transmission capacity and integration of photovoltaic cables are increasingly required. Multi-core photovoltaic cables have the advantages of being able to simultaneously transmit multiple currents, reducing the number of cable installations, and reducing the wiring complexity of power stations, and are widely used in the connection between photovoltaic module strings, combiner boxes and inverters, becoming a key component for improving the overall operating efficiency of power stations.

[0003] However, the heat dissipation problem of multi-core cables in a large current transmission scenario has always been a core challenge to their safe operation. Due to the compact arrangement of each group of cores in the multi-core structure in the same sheath, the distance between the cores is close, the space is closed, and when a large current passes through, the skin effect and proximity effect are significantly enhanced, causing the heat generated per unit volume to increase sharply - especially during the noon sunlight period or in a high-temperature environment in summer, the operating temperature of the multi-core cable can be increased by more than 40℃ above the ambient temperature, and some local areas even exceed 130℃. If this accumulated heat cannot be dissipated in time, it will directly threaten the safe operation of the cable: high temperature will accelerate the molecular chain rupture of the insulation layer material, causing its dielectric constant to decrease and its corona resistance to degrade, and small cracks and air gaps will gradually appear in the area that was originally stable in insulation performance; as the heat continues to accumulate, the local electric field between the core and the insulation layer will be distorted due to the increase in temperature, and when the electric field strength exceeds the tolerance limit of the insulation material, partial discharge is easily triggered, which can further develop into insulation breakdown; more seriously, extreme high temperatures can cause the insulation layer of the core to melt and the sheath to burn, not only causing the cable itself to burn, but also possibly igniting surrounding photovoltaic modules, supports and other equipment, causing a fire accident in the power station.

[0004] Therefore, it is an urgent need in the current new energy photovoltaic field to develop a photovoltaic cable design that can efficiently solve the problem of heat accumulation based on the characteristics of the multi-core structure. SUMMARY

[0005] According to the present application, a photovoltaic cable for new energy photovoltaic power stations is provided, comprising:

[0006] The middle shaft is provided with at least four cable cores around the middle shaft; the partition assembly is provided with a plurality of sleeve pipes which are sequentially sleeved on the middle shaft and include a sleeve pipe sleeved on the bearing; the partition plate is fixed to the outer wall of the sleeve pipe and is inserted between adjacent cable cores; the photovoltaic cable further comprises a support layer which is annularly arranged on the outer periphery of the partition plate and forms an air duct between the middle shaft; an insulation layer is arranged on the outer side of the support layer; the power assembly is arranged at one end of the photovoltaic cable and is in communication with the air duct; and an air outlet in communication with the air duct is arranged on the periphery of the other end of the photovoltaic cable.

[0007] By having the above technical features, the partition assembly not only separates the cable cores around the middle shaft and ensures the heat dissipation space between adjacent cable cores, but also forms a stable air duct in the photovoltaic cable through the support of the partition plate. Through the output of the power assembly, the heat generated by the cable core can be effectively transferred, thereby greatly reducing the temperature constant in the multi-core cable and keeping the cable in a safe and stable working state.

[0008] In some embodiments, the middle shaft is provided with a plurality of insertion grooves around the periphery of the middle shaft along the length direction of the middle shaft; and the inner ring side of the sleeve pipe is provided with an insertion block matched with the insertion grooves. Thus, the rotation of the sleeve pipe around the middle shaft is limited by the insertion and matching of the insertion grooves and the insertion block, so that the adjacent partition plates can assist in supporting the cable core, the installation position of each cable core is limited, the space of the air duct is ensured, and the contact area of the cable core and the wind force is ensured when the power assembly acts, thereby improving the carrying efficiency of the wind force on the heat.

[0009] In some embodiments, the partition plates in adjacent partition assemblies are located on the left and right sides of the same cable core. Thus, the partition plates are arranged more uniformly, the adjacent partition plates abut each other, and the support for the cable core is more stable.

[0010] In some embodiments, each partition plate is provided with an elastic support plate which is elastically bent to both sides at the end portion of the support layer. Thus, when the photovoltaic cable is subjected to external impact, the kinetic energy can be buffered by the elastic deformation of the elastic support plate, and the elastic support plate also expands the space of the air duct, thereby providing a larger space for deformation and energy release.

[0011] In some embodiments, the support layer is composed of a plurality of guard plates and elastic plates, the guard plates are arranged in a ring shape, the elastic plates are arranged between adjacent guard plates and are fixed to the edges of the two adjacent guard plates. In this way, when the photovoltaic cable is partially impacted, the strength of the guard plate is high, and the structure of the guard plate is not easily damaged. The guard plate transmits the force to the elastic plate through its displacement, and the elastic plate can absorb the impact force through its elastic deformation, thereby achieving the effect of buffering the force. In addition, the arrangement of the elastic plate can reduce the propagation range of the impact force and control the deformation area locally.

[0012] In some embodiments, the cross section of the elastic plate is V-shaped, and each elastic plate is located on the side of each cable core away from the central axis, and the tip of the elastic plate abuts against the outer circumferential side of the cable core. In this way, the abutment of the elastic plate against the cable core limits the space on the circumferential side of the cable core, so that the heat dissipation efficiency of the cable core is higher.

[0013] In some embodiments, the circumferential side of the cable core is provided with a shielding layer made of metal. In this way, the shielding layer not only has the effect of resisting electromagnetic interference and preventing external electromagnetic fields from interfering with the internal signals of the cable, but also increases the contact range with the wind force and accelerates the heat carrying efficiency.

[0014] In some embodiments, the partition plate includes a deformation part in the shape of a water droplet, an arc-shaped bottom surface of the deformation part is fixed to the sleeve, a force receiving part has one end fixed to the top of the deformation part and the other end fixed to the elastic support plate. In this way, the deformation part has a large bottom space and abuts against the cable core, thereby assisting in supporting the cable core. When the cable core is partially impacted, the partition plate deforms under stress, the deformation range of the deformation part is increased, and the support range of the cable core is increased, so as to ensure the free space on the circumferential side of the cable core, on the one hand, to ensure the normal work of the cable core, and on the other hand, to greatly improve the heat dissipation efficiency of the cable core.

[0015] In some embodiments, an auxiliary support shaft is fixed in each partition plate, the auxiliary support shaft is arranged along the length direction of the partition plate, one end of the auxiliary support shaft is fixed to the outer wall of the sleeve, and the other end of the auxiliary support shaft penetrates the force receiving part and is in sliding connection with the force receiving part. In this way, the support strength of the partition plate is increased, and the overall service life of the photovoltaic cable is improved.

[0016] In some embodiments, the power assembly includes a fan, a wind pipe having one end fixed to the air outlet of the fan, a connecting seat arranged on the circumferential side of one end of the photovoltaic cable and in communication with the air duct, and the other end of the wind pipe is in communication with the outside of the connecting seat. In this way, the wind energy is provided from one end of the cable to the other end of the cable through the wind power of the fan, and the heat generated by the operation of the cable core is carried away from the cable body, thereby greatly improving the heat dissipation efficiency of the cable.

[0017] It should be understood that the description in the Summary of the Invention section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0018] Figure 1 A cross-sectional view of a photovoltaic cable for a new energy photovoltaic power station, according to an embodiment of the present invention, is shown.

[0019] Figure 2 This invention illustrates a schematic diagram of the structure of a separator component in a photovoltaic cable for a new energy photovoltaic power station, according to an embodiment of the present invention.

[0020] Figure 3 A schematic diagram of the fixing structure of the separator component and the central shaft in a photovoltaic cable for a new energy photovoltaic power station according to an embodiment of the present invention is shown;

[0021] Figure 4 A schematic diagram of the power component in a photovoltaic cable for a new energy photovoltaic power station, according to an embodiment of the present invention, is shown.

[0022] Symbol Explanation

[0023] 1. Central shaft; 11. Slot; 2. Separator assembly; 21. Sleeve; 22. Separator plate; 221. Deformation part; 222. Force-bearing part; 223. Elastic support part; 2231. Elastic support plate; 23. Insert block; 24. Auxiliary support shaft; 3. Cable core; 4. Support layer; 41. Protective plate; 42. Spring plate; 5. Shielding layer; 6. Insulation layer; 7. Power assembly; 71. Connecting seat; 72. Air duct; 73. Fan. Detailed Implementation

[0024] The preferred embodiments (or implementation methods) of the present invention will now be described in detail with reference to the accompanying drawings.

[0025] The following is for reference. Figures 1-4 This invention describes a photovoltaic cable for a new energy photovoltaic power station.

[0026] Figure 1 A cross-sectional view of a photovoltaic cable for a new energy photovoltaic power station, according to an embodiment of the present invention, is shown. (Reference) Figure 1 As shown, the photovoltaic cable for a new energy photovoltaic power station provided in this embodiment includes a central shaft 1; a separator component 2 sleeved on the central shaft 1; multiple cable cores 3 distributed around the central shaft 1 component; a support layer 4 coaxially disposed outside the central shaft 1 and abutting against the separator component 2; a shielding layer 5 covering the outside of the support layer 4; and an insulation layer 6 covering the outside of the shielding layer 5.

[0027] The middle shaft 1 is a cylindrical shaft body, which can be made of nylon material, and the nylon material has excellent impact toughness and bending fatigue strength, and the middle shaft 1 is located in the central region of the photovoltaic cable and can assist in supporting the whole cable to share the support pressure of the cable core 3.

[0028] The cable core 3 is provided with at least four cable cores, so that the separation assembly 2 can stably support the support layer in the cable.

[0029] The shielding layer 5 is a metal strip wound outside the support layer 4, which can not only increase the strength of the whole cable, but also can resist electromagnetic interference and prevent electromagnetic radiation, and further, the high-voltage cable is used to avoid charge accumulation to break down the insulation layer 6.

[0030] The insulation layer 6 is a key functional layer wrapped outside the conductor, and the core function is to isolate the conductor from the external environment, prevent current leakage or short circuit between different conductors, and ensure that the electric energy or electric signal is only transmitted in the conductor, which is the basis for ensuring the safe operation of the cable. The material selection of the insulation layer 6 needs to be determined according to the voltage level, use scene and performance requirements of the cable. The high-voltage cable is mostly made of cross-linked polyethylene, which has strong high-voltage resistance and good thermal stability, and can withstand high electric field and high temperature for a long time, which is the mainstream choice in the high-voltage field.

[0031] Figure 2 A structure diagram of a separation assembly 2 of a photovoltaic cable for a new energy photovoltaic power station is shown. Figure 2 As shown, the separation assembly 2 includes a circular sleeve 21, and the inner wall of the sleeve 21 has a diameter matched with the diameter of the middle shaft 1 to meet the mutual sleeving of the middle shaft 1. The sleeve 21 is provided with a separation plate 22 on the circumferential side.

[0032] Further, a plurality of insertion grooves 11 are formed on the circumferential side of the middle shaft 1, the insertion grooves 11 are formed along the length direction of the middle shaft 1, and the insertion grooves 11 are equidistantly arranged along the circumferential side of the middle shaft 1. The cross section of the insertion groove 11 can be an arc or a polygonal groove, and the inner wall of the sleeve 21 is provided with an insertion block 23 matched with the insertion groove 11. Through the mutual sleeving of the sleeve 21 and the middle shaft 1 and the mutual matching of the insertion block 23 and the insertion groove 11, the rotation of the sleeve 21 around the middle shaft 1 is limited, and the fixed area of the separation plate 22 is further limited.

[0033] Specifically, the partition plate 22 comprises a deformation portion 221 at the bottom, a stress portion 222 fixed at the end of the deformation portion 221, and an elastic support portion 223 fixed at the end of the stress portion 222. The deformation portion 221 is a hollow pipe body with a water drop-shaped cross section, which will cause the bottom of the deformation portion 221 to be extruded and deformed under the pressure of the stress portion 222. The stress portion 222 is a plate body, which mainly serves to support and extend the length of the whole partition plate 22. The elastic support portion 223 comprises two elastic support plates 2231 distributed in an arc shape on both sides of the stress portion 222, and the ends thereof abut against the inner wall of the support layer 4, thereby increasing the abutting area of the partition plate 22 and the support layer 4, so as to stabilize the gap between the central shaft 1 and the support layer 4.

[0034] In some embodiments, the deformation portion 221, the stress portion 222 and the elastic support portion 223 are integrally formed of a plastic material. Specifically, the partition plate 22 can be made of a reinforced polyamide material, which has excellent strength and toughness, and after being reinforced by glass fiber, the long-term use temperature can reach 120-150 DEG C, and the short-term can withstand more than 200 DEG C, so as to meet the normal operation of the cable in a high temperature environment.

[0035] Further, an auxiliary support shaft 24 is arranged in the partition plate 22, which is arranged along the length direction of the partition plate 22, one end of which is fixed to the outer wall of the sleeve 21, penetrates the partition plate 22, and is in sliding connection with the stress portion 222. Under the support of the auxiliary support shaft 24, the overall support strength of the partition plate 22 is improved, and the normal deformation space of the deformation portion 221 can be met. Even the maximum deformation space of the deformation portion 221 can be controlled by the sliding distance of the auxiliary support shaft 24 and the stress portion 222, so as to ensure the safety and stability of the overall structure of the partition plate 22.

[0036] Figure 3 A fixing structure diagram of a partition assembly 2 and a central shaft 1 of a photovoltaic cable for a new energy photovoltaic power station is shown. Figure 3 As shown, the sleeve 21 is sequentially sleeved on the circumferential side of the central shaft 1, and in the sleeving process of the adjacent sleeves 21 and the central shaft 1, the mutual insertion of the insertion block 23 and the corresponding insertion slot 11 is adjusted, and then the separation angle of the partition plate 22 and the installed partition plate 22 is adjusted. Moreover, the separation angle of the newly sleeved partition plate 22 and the previous fixed partition plate 22 is the same, and the angle between the adjacent partition plates 22 needs to be finally determined according to the specific number of cable cores 3. If the cable core 3 is provided with five, the partition assembly 2 needs to be provided with five, so as to meet the partition of each partition plate 22 to the adjacent cable core 3. Then, the corresponding five partition plates 22 are a period, and a plurality of periods need to be arranged on the central shaft 1 along the length direction thereof, so as to meet the partition and erection of the cable core 3 by the partition assembly 2.

[0037] In one aspect, one partition assembly 2 only has one partition plate 22, which can only be inserted between the corresponding adjacent two cable cores 3 in the annular area where it is located, and the partition plate 22 plays a supporting role for one of the cable cores 3. Similarly, multiple periodic partition assemblies 2 are arranged, which not only reduces the space occupation between the central shaft 1 and the support layer 4, but also saves the material of the partition plate 22. Further, the use of interval support means also guarantees the stability of the support of the partition plate 22 to the cable core 3.

[0038] Reference Figure 1 As shown, the support layer 4 is an annular structure, which specifically includes a plurality of guard plates 41 and a plurality of elastic plates 42, each elastic plate 42 is located between adjacent guard plates 41, and specifically the number of elastic plates 42 is the same as the number of cable cores 3. The guard plate 41 is an arc-shaped plate body to better match the overall profile of the cable, and the elastic plate 42 is V-shaped as a whole, which is arranged at the periphery of the cable core 3, and the tip region abuts the peripheral side of the cable core 3. On the one hand, the elastic plate 42 exerts a force on the cable core 3, driving the cable core 3 to displace in the direction of the included angle between the adjacent partition plates 22, and the deformed part 221 of the partition plate 22 plays a supporting role for the cable core 3, so that the cable core 3 is subjected to double support from the inside and outside, not only guaranteeing the stability of the fixation of the cable core 3, but also limiting the cable core 3 in the middle space between the central shaft 1 and the support layer 4. If it is subjected to impact and external extrusion, the space around the cable core 3 can provide a buffer space for the cable core 3, thereby guaranteeing the safety and stability of the cable core 3.

[0039] Further, the guard plate 41 and the elastic plate 42 are integrally arranged of plastic material, which can be arranged of the same material as the partition assembly 2, which has excellent strength and toughness, and can also meet the high temperature environment of the cable in daily use. When the local guard plate 41 is impacted, it will transfer the impact force to the direction of the elastic plates 42 on both sides, and the impact force will be offset by the deformation of the elastic plates 42 on both sides. On the one hand, it guarantees the safety and stability of the support layer 4, and on the other hand, it reduces the interference to the environment of the support layer 4 around the stress area. Moreover, the space formed between the central shaft 1 and the support layer 4 not only limits the fixed position of the cable core 3, but also guarantees the heat dissipation space of each cable core 3. Specifically, the space between the central shaft 1 and the support layer 4 can also form an air duct, which provides flowing air at one end to transfer the heat generated by the cable core 3, thereby greatly improving the heat dissipation efficiency of the cable as a whole.

[0040] Figure 4 A structure diagram of a power assembly 7 for a photovoltaic cable for a new energy photovoltaic power station is shown. Reference Figure 4As shown, one end of the cable is provided with a power assembly 7, and an air inlet is formed outside the cable insulation layer 6 and communicates with the internal air duct of the cable. The power assembly 7 specifically includes a connecting seat 71 sleeved on the air inlet area of the cable, the connecting seat 71 is sealingly arranged on the outer circumferential side of the cable, one side of the connecting seat 71 is connected with an air pipe 72, the end of the air pipe 72 communicates with the inside of the connecting seat 71, the other end of the air pipe 72 is provided with a fan 73 and communicates with the air outlet of the fan 73. The other end of the cable is provided with an air outlet which communicates with the internal air duct. Under the action of the fan 73, the airflow is blown into the internal air duct of the cable at high speed, which accelerates the airflow in the air duct and greatly improves the heat transfer efficiency.

[0041] Further, referring to Figure 1 As shown, the outer part of each cable core 3 is further wrapped with a metal shielding layer 5, which can prevent external electromagnetic fields from interfering with the signals inside the cable, and the heat generated by the cable core 3 is collected in the shielding layer 5, which accelerates the spread of heat and improves the overall heat dissipation efficiency of the air duct.

[0042] In the description of the present application, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integral connection; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic cable for photovoltaic power generation, characterized in that, include: Central axis (1), The cable core (3) is provided in at least 4 parts and is located on the periphery of the central axis (1); Multiple separator components (2) are provided and sequentially fitted onto the central axis (1), and include... A sleeve (21) is fitted onto the central shaft (1); A separator (22) is fixed to the outer wall of the sleeve (21) and inserted between adjacent cable cores (3); the photovoltaic cable also includes The support layer (4) is arranged in a ring on the outer periphery of the partition plate (22) and forms an air duct with the central axis (1); An insulating layer (6) is disposed on the outside of a support layer (4); The power component (7) is located at one end of the photovoltaic cable and is connected to the air duct. An air outlet, which is connected to the air duct, is provided on the periphery of the other end of the photovoltaic cable.

2. The photovoltaic cable for photovoltaic power generation according to claim 1, characterized in that, The outer circumferential surface of the central shaft (1) is provided with slots (11) along its length direction, and multiple slots (11) are provided and are evenly distributed around the periphery of the central shaft (1); The inner ring side of the sleeve (21) is provided with a plug (23) that cooperates with the slot (11).

3. The photovoltaic cable for photovoltaic power generation according to claim 2, characterized in that, The partition plates (22) in the adjacent partition components (2) are located on the left and right sides of the same cable core (3).

4. The photovoltaic cable for photovoltaic power generation according to claim 3, characterized in that, Each of the partition plates (22) is provided with an elastic support plate (2231) that bends elastically to both sides at the end facing the support layer (4).

5. The photovoltaic cable for photovoltaic power generation according to claim 4, characterized in that, The support layer (4) is composed of a protective plate (41) and a spring plate (42). The protective plate (41) is provided in multiple ways and arranged in a ring. The spring plate (42) is located between adjacent protective plates (41) and is fixed to the edges of the two protective plates (41).

6. A photovoltaic cable for photovoltaic power generation according to claim 5, characterized in that, The cross-section of the spring plate (42) is V-shaped, and each spring plate (42) is located on the side of each cable core (3) away from the central axis (1), with its tip abutting against the outer periphery of the cable core (3).

7. A photovoltaic cable for photovoltaic power generation according to claim 6, characterized in that, The cable core (3) is surrounded by a metal shielding layer (5).

8. A photovoltaic cable for photovoltaic power generation according to claim 7, characterized in that, The partition plate (22) includes The deformable part (221) is teardrop-shaped, and its arc-shaped bottom surface is fixed to the sleeve (21); The force-bearing part (222) has one end fixed to the top of the deformation part (221) and the other end fixed to the elastic support plate (2231).

9. A photovoltaic cable for photovoltaic power generation according to claim 8, characterized in that, Each partition plate (22) has an auxiliary support shaft (24) fixed inside. The auxiliary support shaft (24) is arranged along the length of the partition plate (22). One end of the shaft is fixed to the outer wall of the sleeve (21), and the other end passes through the force-bearing part (222) and is slidably connected to the force-bearing part (222).

10. A photovoltaic cable for photovoltaic power generation according to claim 1, characterized in that, The power assembly (7) includes Fan (73), The air duct (72) is fixed at one end to the air outlet of the fan (73); The connector (71) is fitted around one end of the photovoltaic cable and is connected to the air duct. The outside of the connector (71) is connected to the other end of the air duct (72).

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