A forced air cooled photovoltaic reactor

Abstract

This invention relates to the field of reactor technology, specifically to an air-cooled photovoltaic reactor, comprising a cabinet; the cabinet houses a cooling fan and a reactor body; the reactor body includes a core assembly, a coil assembly, and a mounting assembly; the core assembly is mounted on the mounting assembly; the core assembly includes an upper yoke, a lower yoke, and a core column disposed between the upper and lower yokes; the upper yoke has an upper air duct; the lower yoke has a lower air duct; the core column has an upper magnetic flux guide block; the top of the upper magnetic flux guide block has an upward-opening upper V-shaped groove; the core column has a lower magnetic flux guide block; the bottom of the lower magnetic flux guide block has a downward-opening lower V-shaped groove; the coil assembly is wound around the core column. This invention provides air ducts on the upper and lower yokes of the reactor, and simultaneously guides the main magnetic flux to the upper and lower yokes through the magnetic flux guide blocks, preventing leakage magnetic flux diffraction to the coil and causing localized overheating, while also achieving a heat dissipation effect.

Description

Technical Field

[0001] This invention relates to the field of reactor technology, specifically to an air-cooled photovoltaic reactor. Background Technology

[0002] Centralized large-capacity photovoltaic power plants are often installed in locations with good sunlight, such as deserts or near deserts, or by the sea, to maximize power generation. Photovoltaic inverters face complex and diverse external environments, including salt spray, sandstorms, rain, and condensation. Meanwhile, industry competition is becoming increasingly fierce, making miniaturization, high power density, and high reliability particularly important. In centralized large-capacity photovoltaic inverters, a 1MW inverter of the same size can now accommodate 1.5MW of power, increasing energy density by 50%. Clearly, material, transportation, installation, and maintenance costs can be effectively reduced, leading to improvements in losses and heat generation. Tests show that over 90% of the heat generated in the entire unit comes from the filter reactors and power modules; rapidly dissipating this heat is highly beneficial for increasing the overall power density of the unit. Currently, most of the cooling methods for complete machines in the industry are air cooling. Existing air cooling methods mostly use bottom air intake, and although air intake filters are added, a lot of dust still enters the components or blocks the air intake filter, affecting the air intake volume of the whole machine. Some manufacturers also use top air intake of the cabinet, but the top plane of the cabinet is still a place where dust easily accumulates.

[0003] On the other hand, since the three-phase reactor consists of three-phase coils A, B, and C from left to right, it is obvious that the heat dissipation of the middle coil B is relatively poor. Ordinary air cooling airflow is difficult to enter the coil. Even if the reactor transverse yoke increases the airflow to allow air to enter the reactor, the leakage flux at the upper and lower ends of the reactor core column at the transverse yoke airflow is not properly handled, which increases the additional loss of the whole machine and causes local overheating of the coil due to the eddy current effect of leakage flux.

[0004] Therefore, existing technologies need to be improved. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing an air-cooled photovoltaic reactor that solves the sandstorm problem caused by the original air intake method and allows airflow to enter the reactor's three-phase coils for heat dissipation without increasing magnetic leakage at the ends of the iron core columns.

[0006] The objective of this invention is achieved through the following technical solution: a wind-cooled photovoltaic reactor, comprising a cabinet; the cabinet is equipped with a cooling fan and a reactor body; the reactor body comprises an iron core assembly, a coil assembly, and a mounting assembly;

[0007] The core assembly is mounted on the mounting assembly; the core assembly includes an upper transverse yoke, a lower transverse yoke, and a core column disposed between the upper and lower transverse yokes; the upper transverse yoke includes an upper front transverse yoke and an upper rear transverse yoke disposed opposite to each other; an upper air passage is formed between the upper front transverse yoke and the upper rear transverse yoke; the lower transverse yoke includes a lower front transverse yoke and a lower rear transverse yoke disposed opposite to each other; a lower air passage is formed between the lower front transverse yoke and the lower rear transverse yoke; the top of the core column is provided with a first upper silicon steel lamination, an upper magnetic flux guide block, and a second upper silicon steel lamination; the upper magnetic flux guide block is disposed between the first upper silicon steel lamination and the second upper silicon steel lamination; the upper front transverse yoke is disposed between the first upper silicon steel lamination and the second upper silicon steel lamination; The top of the steel laminations; the upper rear transverse yoke is located on the top of the second upper silicon steel laminations; the upper air passage is located on the top of the upper magnetic flux guide block; the top of the upper magnetic flux guide block is provided with an upward-opening upper V-shaped groove; the bottom of the iron core column is provided with a first lower silicon steel lamination, a lower magnetic flux guide block, and a second lower silicon steel lamination; the lower magnetic flux guide block is located between the first lower silicon steel lamination and the second lower silicon steel lamination; the lower front transverse yoke is located at the bottom of the first lower silicon steel lamination; the lower rear transverse yoke is located at the bottom of the second lower silicon steel lamination; the lower air passage is located at the bottom of the lower magnetic flux guide block; the bottom of the lower magnetic flux guide block is provided with a downward-opening lower V-shaped groove;

[0008] The coil assembly is wound around the iron core post.

[0009] The present invention is further configured such that a plurality of upper insulating support strips are provided between the upper front transverse yoke and the upper rear transverse yoke; and a plurality of lower insulating support strips are provided between the lower front transverse yoke and the lower rear transverse yoke.

[0010] The first upper silicon steel lamination, the upper magnetic flux guide block, and the second upper silicon steel lamination are set at the same height; the first lower silicon steel lamination, the lower magnetic flux guide block, and the second lower silicon steel lamination are set at the same height.

[0011] The present invention is further configured such that the iron core column is provided with a plurality of air gap blocks along the height direction.

[0012] The present invention is further configured such that the upper magnetic flux guide block and the lower magnetic flux guide block are made of metal magnetic powder core or are made of stacked silicon steel sheets;

[0013] Both the upper and lower V-grooves are filled with non-magnetic material.

[0014] The present invention is further configured such that the thickness of the upper magnetic flux guide block is the same as the width of the upper air passage; and the depth of the upper V-groove is greater than or equal to 1.5 times the thickness of the upper magnetic flux guide block.

[0015] The thickness of the lower magnetic flux guide block is the same as the width of the lower air passage; the depth of the lower V-groove is greater than or equal to 1.5 times the thickness of the lower magnetic flux guide block.

[0016] The working magnetic flux density of the core column is lower than the saturation magnetic flux density of the upper magnetic flux guide block and lower than the saturation magnetic flux density of the lower magnetic flux guide block.

[0017] The present invention is further configured such that the cabinet body is provided with a baffle plate and a partition plate; an air inlet cavity is formed at the top of the partition plate; a heat dissipation cavity is formed between the bottom of the partition plate and the baffle plate; a cooling fan is provided at the bottom of the partition plate; an air inlet is provided in the air inlet cavity; the top of the coil assembly, the top of the iron core column, and the upper transverse yoke are all provided in the heat dissipation cavity.

[0018] The cooling fan is positioned directly above the top of the coil assembly; the cabinet has an air outlet at the bottom of the heat dissipation cavity; and the air inlet is equipped with a filter screen.

[0019] The reactor body is coated with a three-proof paint.

[0020] The present invention is further configured such that the coil assembly includes an input busbar, an output busbar, and a conductor; the input busbar and the output busbar are respectively connected to the input end and the output end of the conductor;

[0021] The conductor is wound around the iron core column; the conductor has multiple first heat dissipation channels; and the conductor and the iron core column have multiple second heat dissipation channels.

[0022] The present invention is further configured such that insulating clamps are provided at both the front end and the rear end of the iron core column; right-angled insulating air duct support bars are provided at all four corners of the iron core column; first I-shaped insulating air duct support bars are provided on both the left and right sides of the iron core column; and a second I-shaped insulating air duct support bar is provided at the first heat dissipation air duct of the conductor.

[0023] The top and bottom of the coil assembly are both provided with high-temperature resistant insulating silicone.

[0024] The present invention is further configured such that the mounting assembly includes an upper clamp, a lower clamp, a U-shaped top pressing member, a base, a longitudinal locking bolt, a transverse locking bolt, a tensioning block, and a shock-absorbing pad;

[0025] The upper clamp is located between the upper front transverse yoke and the core column, and between the upper rear transverse yoke and the core column; the lower clamp is located between the lower front transverse yoke and the core column, and between the lower rear transverse yoke and the core column.

[0026] The U-shaped top pressing member is located at the top of the upper transverse yoke; the tensioning block is located on the lower clamping member; the base is located at the bottom of the lower transverse yoke; the U-shaped top pressing member and the tensioning block are connected by the longitudinal locking bolt; the upper transverse yoke and the lower transverse yoke are respectively fixedly connected to the upper clamping member and the lower clamping member by the transverse locking bolt.

[0027] The upper clamp is provided with product lifting holes; the shock-absorbing pad is installed at the bottom of the base.

[0028] The beneficial effects of this invention are as follows: 1. By adding air ducts to the upper and lower transverse yokes of the reactor body, air can enter the coil and carry away its heat, thereby improving the overall power density and reliability. V-shaped magnetic flux guide blocks are added to both ends of the iron core column to guide the main magnetic flux to the upper and lower transverse yokes, reducing leakage magnetic flux diffraction to the coil and avoiding local overheating at the coil end; 2. The use of top air intake and the placement of the air inlet at the top of the cabinet prevents or reduces the entry of wind and sand into the cabinet, affecting the safety of internal components; 3. End seals are set at the upper and lower ends of the reactor coil to prevent dust, moisture and salt spray from entering, thus improving its reliability. Attached Figure Description

[0029] The invention will be further illustrated with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the invention. For those skilled in the art, other drawings can be obtained based on the following drawings without any creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the reactor body of the present invention;

[0031] Figure 2 This is a schematic diagram of the core assembly of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the magnetic flux guiding block of the present invention;

[0033] Figure 4 This is a schematic diagram of the magnetic flux flow direction from a side view of the present invention;

[0034] Figure 5 This is a top view of the iron core column and coil assembly of the present invention.

[0035] Figure 6 This is a schematic diagram of the structure of the present invention;

[0036] Figure 7 This is a side view of the airflow path diagram of the present invention;

[0037] Among them: 11. Upper left transverse yoke; 12. Upper right transverse yoke; 13. Upper air duct; 14. Upper insulating support strip; 21. Lower left transverse yoke; 22. Lower right transverse yoke; 23. Lower air duct; 24. Lower insulating support strip; 3. Iron core column; 31. Air gap block; 41. First upper silicon steel lamination; 42. Second upper silicon steel lamination; 43. Upper magnetic flux guide block; 44. Upper V-groove; 51. First lower silicon steel lamination; 52. Second lower silicon steel lamination; 53. Lower magnetic flux guide block; 54. Lower V-groove; 6. Cabinet; 61. Baffle plate; 62. Partition plate; 63. Air inlet cavity; 6 4. Heat dissipation cavity; 65. Filter screen; 7. Cooling fan; 8. Coil assembly; 81. Inlet bar; 82. Outlet bar; 83. Conductor; 84. First heat dissipation duct; 85. Second heat dissipation duct; 86. Insulating clamp; 87. Right-angle insulating duct support bar; 88. First I-shaped insulating duct support bar; 89. Second I-shaped insulating duct support bar; 80. High-temperature resistant insulating silicone; 91. Upper clamp; 92. Lower clamp; 93. U-shaped top pressure piece; 94. Base; 95. Longitudinal locking bolt; 96. Horizontal locking bolt; 97. Tensioning block; 98. Shock-absorbing pad. Detailed Implementation

[0038] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention. It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0039] Depend on Figures 1 to 7 As can be seen, the air-cooled photovoltaic reactor described in this embodiment includes a cabinet 6; the cabinet 6 is equipped with a cooling fan 7 and a reactor body; the reactor body includes an iron core assembly, a coil assembly 8 and a mounting assembly;

[0040] The core assembly is mounted on the mounting assembly; the core assembly includes an upper transverse yoke, a lower transverse yoke, and a core column 3 disposed between the upper and lower transverse yokes; the upper transverse yoke includes an upper front transverse yoke and an upper rear transverse yoke disposed opposite to each other; an upper air passage 13 is formed between the upper front transverse yoke and the upper rear transverse yoke; the lower transverse yoke includes a lower front transverse yoke and a lower rear transverse yoke disposed opposite to each other; a lower air passage 23 is formed between the lower front transverse yoke and the lower rear transverse yoke; the top of the core column 3 is provided with a first upper silicon steel lamination 41, an upper magnetic flux guide block 43, and a second upper silicon steel lamination 42; the upper magnetic flux guide block 43 is disposed between the first upper silicon steel lamination 41 and the second upper silicon steel lamination 42; the upper front transverse yoke is disposed on the top of the first upper silicon steel lamination 41; The upper rear transverse yoke is located on the top of the second upper silicon steel lamination 42; the upper air passage 13 is located on the top of the upper magnetic flux guide block 43; the top of the upper magnetic flux guide block 43 is provided with an upward-opening upper V-shaped groove 44; the bottom of the iron core column 3 is provided with a first lower silicon steel lamination 51, a lower magnetic flux guide block 53, and a second lower silicon steel lamination 52; the lower magnetic flux guide block 53 is located between the first lower silicon steel lamination 51 and the second lower silicon steel lamination 52; the lower front transverse yoke is located at the bottom of the first lower silicon steel lamination 51; the lower rear transverse yoke is located at the bottom of the second lower silicon steel lamination 52; the lower air passage 23 is located at the bottom of the lower magnetic flux guide block 53; the bottom of the lower magnetic flux guide block 53 is provided with a downward-opening lower V-shaped groove 54;

[0041] The coil assembly 8 is wound around the iron core post 3.

[0042] Specifically, in the wind-cooled photovoltaic reactor described in this embodiment, the upper left transverse yoke 111 and the upper right transverse yoke 12 are made of silicon steel sheets of the same size, and the lower left transverse yoke 21 and the lower right transverse yoke 22 are made of silicon steel sheets of the same size; the core column 3 is made of multiple layers of stacked silicon steel sheets, and the first and last layers at the top of the core column 3 are respectively made of two parts of stacked silicon steel sheets of the same size, that is, the first upper silicon steel sheet 41, the second upper silicon steel sheet 42, the first lower silicon steel sheet 51 and the second lower silicon steel sheet 52 have the same structure.

[0043] Depend on Figures 2 to 4 As shown, this embodiment, by setting the upper magnetic flux guide block 43 and the lower magnetic flux guide block 53, can better guide the magnetic flux in the middle of the iron core column 3 into the upper and lower transverse yokes, preventing the magnetic flux Φ in the middle of the iron core column 3 from diffracting into the air due to the lack of upper and lower transverse yoke circuits. Since magnetic flux, like current, will follow the shortest distance or the easiest path, without the upper magnetic flux guide block 43 and the lower magnetic flux guide block 53, most of the magnetic flux Φ in the middle of the iron core column 3 would flow into the coil assembly 8, forming leakage flux Φ1. Figure 6As shown, leakage flux Φ1 can cause eddy currents in the conductor 83 of coil assembly 8, leading to localized overheating. In the past, due to the large design margin of photovoltaic inverters, including photovoltaic reactors, the localized overheating of coil assembly 8 was not significantly affected unless the leakage flux Φ1 was severe. However, with the current power density of the entire unit increased by 1.5 times, the volume of internal components, including the reactors themselves, has been greatly compressed, which will further increase the heat generation, while the heat dissipation area has not increased much. As a result, the heat accumulation will be quite serious. The current solution is to design more unobstructed air ducts, larger air volume, air speed, and air pressure. Therefore, the wind-cooled photovoltaic reactor in this embodiment allows wind energy to enter the coil assembly 8, especially the middle coil, better by setting an upper air duct 13 and a lower air duct 23 on the upper and lower transverse yokes, respectively, thereby reducing its temperature rise. Furthermore, when the upper magnetic flux guide block 43 and the lower magnetic flux guide block 53 are added, the magnetic flux Φ of the iron core column 3 is gradually introduced into the upper and lower transverse yokes, preventing it from flowing into the conductor 83 of the coil assembly 8, forming a... Figure 6 The magnetic flux Φ2 is shown.

[0044] In this embodiment, a wind-cooled photovoltaic reactor is provided with several upper insulating support bars 14 between the upper front yoke and the upper rear yoke; and several lower insulating support bars 24 between the lower front yoke and the lower rear yoke. Specifically, the above arrangement makes the core assembly structurally stable and reliable.

[0045] The first upper silicon steel lamination 41, the upper magnetic flux guide block 43, and the second upper silicon steel lamination 42 are arranged at the same height; the first lower silicon steel lamination 51, the lower magnetic flux guide block 53, and the second lower silicon steel lamination 52 are also arranged at the same height. This arrangement ensures product performance and facilitates assembly.

[0046] In this embodiment, an air-cooled photovoltaic reactor is described, wherein the core column 3 is provided with a plurality of air gap blocks 31 along its height. Specifically, the core column 3 is composed of multiple layers of stacked silicon steel sheets, and air gap blocks 31 are provided between adjacent layers, thereby forming a core air channel and further enhancing the heat dissipation effect of the core assembly.

[0047] In this embodiment, the upper magnetic flux guide block 43 and the lower magnetic flux guide block 53 are made of metal magnetic powder cores or are made of stacked silicon steel sheets.

[0048] Specifically, the upper magnetic flux guide block 43 and the lower magnetic flux guide block 53 can be formed by V-shaped molding and heat treatment of metal magnetic powder core material. The metal powder core material is one or more of iron powder, iron-silicon, iron-silicon-aluminum, amorphous microcrystalline, iron-nickel-molybdenum, etc., with a magnetic permeability higher than 90μ. The permeability is higher than 90μ in order to better guide the magnetic flux of the iron core column 3 to the upper and lower transverse yokes.

[0049] Optionally, the upper flux guide block 43 and the lower flux guide block 53 are V-shaped by stacked silicon steel sheets of different lengths through stepped code pieces; the permeability of silicon steel sheets is much higher than that of metal magnetic powder cores, and the performance is better, but stacking is slightly more time-consuming, and the structural strength and compactness are not as good as those of integrally formed metal magnetic powder cores.

[0050] Both the upper V-groove 44 and the lower V-groove 54 are filled with non-magnetic material. Specifically, through the above arrangement, the upper magnetic flux guide block 43 and the lower magnetic flux guide block 53 form a cuboid structure after filling, which reduces noise and increases strength.

[0051] In this embodiment, the thickness t of the upper magnetic flux guide block 43 is the same as the width T of the upper air passage 13; the depth h of the upper V-groove 44 is greater than or equal to 1.5 times the thickness t of the upper magnetic flux guide block 43.

[0052] The thickness t of the lower magnetic flux guide block 53 is the same as the width T of the lower air passage 23; the depth h of the lower V-groove 54 is greater than or equal to 1.5 times the thickness t of the lower magnetic flux guide block 53.

[0053] The above settings allow for better introduction of magnetic flux from the middle of the core column 3 into the upper and lower transverse yokes.

[0054] Specifically, the number of coil turns in the air-cooled photovoltaic reactor is obtained from the cross-sectional area of ​​the core column 3. Since the cross-sectional area of ​​the core column 3 is greater than that of the upper and lower transverse yokes, the number of coil turns calculated from the cross-sectional area of ​​the core column 3 will be less, which is beneficial to improving the overall power density. On the other hand, the upper and lower transverse yokes themselves have air channels and are exposed to the outside, resulting in relatively good heat dissipation. Although their magnetic flux density B is higher than that of the core column 3, their temperature rise is lower. The designed magnetic flux density B of the reactor core column 3 is lower than the saturation magnetic flux density Bs of the flux guide block. Obviously, if the designed magnetic flux of the flux guide block is saturated, its magnetic permeability will decrease significantly, affecting its performance.

[0055] The operating magnetic flux density of the core column 3 is lower than the saturation magnetic flux density of the upper flux guide block 43 and lower than the saturation magnetic flux density of the lower flux guide block 53. This configuration ensures the magnetic conductivity of the upper flux guide block 43 and the lower flux guide block 53.

[0056] The air-cooled photovoltaic reactor described in this embodiment includes a coil assembly 8 comprising an input line 81, an output line 82, and a conductor 83; the input line 81 and the output line 82 are respectively connected to the input terminal and the output terminal of the conductor 83.

[0057] The conductor 83 is wound around the iron core post 3; the conductor 83 is provided with multiple first heat dissipation channels 84; and the conductor 83 and the iron core post 3 are provided with multiple second heat dissipation channels 85.

[0058] Specifically, in this embodiment, through the above-mentioned settings, the reactor of this embodiment has air channels on both the upper and lower yokes, and a second heat dissipation air channel 85 is set between the iron core column 3 and the coil. At the same time, a first heat dissipation air channel 84 is also set before and after the coil assembly 8, so that the air can better enter the interior of the coil assembly 8, especially the interior of the middle coil, to reduce its temperature rise.

[0059] In this embodiment, an air-cooled photovoltaic reactor is provided with insulating clamps 86 at both the front and rear ends of the core column 3 to clamp the core column 3 tightly; right-angled insulating air duct support strips 87 are provided at each of the four corners of the core column 3; first I-shaped insulating air duct support strips 88 are provided on both the left and right sides of the core column 3; and second I-shaped insulating air duct support strips 89 are provided at the first heat dissipation air duct 84 of the conductor 83; the above-mentioned arrangements are used to support the first heat dissipation air duct 84 and the second heat dissipation air duct 85.

[0060] The top and bottom of the coil assembly 8 are both provided with high-temperature resistant insulating silicone 80. This design allows for end sealing of the coil assembly 8, preventing windblown sand, salt spray, and moisture from entering the coil assembly 8 and improving its reliability.

[0061] The air-cooled photovoltaic reactor described in this embodiment includes an installation assembly comprising an upper clamp 91, a lower clamp 92, a U-shaped top pressure member 93, a base 94, a longitudinal locking bolt 95, a transverse locking bolt 96, a tensioning block 97, and a shock-absorbing pad 98.

[0062] The upper clamp 91 is located between the upper front transverse yoke and the iron core column 3 and between the upper rear transverse yoke and the iron core column 3; the lower clamp 92 is located between the lower front transverse yoke and the iron core column 3 and between the lower rear transverse yoke and the iron core column 3.

[0063] The U-shaped top pressing member 93 is located at the top of the upper transverse yoke; the tensioning block 97 is located on the lower clamping member 92; the base 94 is located at the bottom of the lower transverse yoke; the U-shaped top pressing member 93 and the tensioning block 97 are connected by the longitudinal locking bolt 95; the upper transverse yoke and the lower transverse yoke are respectively fixedly connected to the upper clamping member 91 and the lower clamping member 92 by the transverse locking bolt 96.

[0064] The upper clamp 91 is provided with a product lifting hole; the shock-absorbing pad 98 is installed at the bottom of the base 94.

[0065] This embodiment describes a wind-cooled photovoltaic reactor. The cabinet 6 contains a baffle plate 61 and a partition plate 62. An air inlet cavity 63 is formed at the top of the partition plate 62. A heat dissipation cavity 64 is formed between the bottom of the partition plate 62 and the baffle plate. The partition plate 62 and the baffle plate form a sealed heat dissipation cavity 64, allowing the air from the cooling fan 7 to be concentrated and dissipate heat from the reactor body. The cooling fan 7 is located at the bottom of the partition plate 62. The air inlet cavity 63 has an air inlet. The top of the coil assembly 8, the top of the core column 3, and the upper transverse yoke are all located within the heat dissipation cavity 64.

[0066] The cooling fan 7 is positioned directly above the top of the coil assembly 8; the cabinet 6 has an air outlet at the bottom of the heat dissipation cavity 64; the air inlet is equipped with a filter screen 65; and the reactor body is coated with a three-proof paint.

[0067] Specifically, by Figure 6 , Figure 7 As shown, the reactor body is installed inside the cabinet 6. A partition 62 is provided on the upper part of the cabinet 6, and a cooling fan 7 is installed on the partition 62. The air inlet is located on the top of the air inlet chamber 63 of the top of the cabinet 6, and a dustproof net is provided at the air inlet. The air inlet is located on the top to limit the entry of sand and dust into the cabinet. Usually, there is a lot of dust and sand on the ground at the bottom of the cabinet 6, and moisture and salt spray can easily enter the cabinet. The top surface of the cabinet 6 is still prone to dust accumulation. Therefore, in this embodiment, the air inlet is located on the top of the cabinet 6 around the top. Since the air inlet is at the top of the cabinet 6 and the reactor body is installed at the bottom of the cabinet 6, a counter-blowing cooling method is adopted. Since the planes of the upper and lower yokes are relatively large and obstruct the airflow, it is not easy for the air to enter the coil assembly 8. Therefore, an upper air duct 13 and a lower air duct 23 are provided on the upper and lower yokes, respectively.

[0068] The cooling fan 7 is a centrifugal fan, and there are three cooling fans 7 that blow directly onto the ABC three-phase coil assembly 8. Centrifugal fans are chosen because they have high air pressure and a longer transmission distance. It should be noted that because the overall air volume is large, the power devices of the photovoltaic inverter can also be located between the cooling fan 7 and the reactor body, sharing this air duct.

[0069] During use, by Figure 7 As shown, there are four types of cooling airflow strokes:

[0070] Type 1: Air inlet → Cooling fan 7 → Upper air duct 13 of upper transverse yoke → Coil assembly 8 → Lower air duct 23 of lower transverse yoke → Air outlet.

[0071] The second type: Air inlet → Cooling fan 7 → Coil assembly 8 → Air outlet;

[0072] The third type: air inlet → cooling fan 7 → upper air duct 13 of upper transverse yoke → coil assembly 8 → air outlet;

[0073] The fourth type: air inlet → cooling fan 7 → coil assembly 8 → lower air duct 23 of lower transverse yoke → air outlet;

[0074] The simultaneous presence of four different cooling airflow rates significantly improves the heat dissipation performance of air-cooled photovoltaic reactors.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An air-cooled photovoltaic reactor, characterized by: It includes a cabinet (6); the cabinet (6) is equipped with a cooling fan (7) and a reactor body; the reactor body includes an iron core assembly, a coil assembly (8) and a mounting assembly; The core assembly is mounted on the mounting assembly; the core assembly includes an upper transverse yoke, a lower transverse yoke, and a core column (3) disposed between the upper transverse yoke and the lower transverse yoke; the upper transverse yoke includes an upper front transverse yoke and an upper rear transverse yoke disposed opposite to each other; an upper air passage (13) is formed between the upper front transverse yoke and the upper rear transverse yoke; the lower transverse yoke includes a lower front transverse yoke and a lower rear transverse yoke disposed opposite to each other; a lower air passage (23) is formed between the lower front transverse yoke and the lower rear transverse yoke; the top of the core column (3) is provided with a first upper silicon steel lamination (41), an upper magnetic flux guide block (43), and a second upper silicon steel lamination (42); the upper magnetic flux guide block (43) is disposed between the first upper silicon steel lamination (41) and the second upper silicon steel lamination (42); the upper front transverse yoke is disposed on the top of the first upper silicon steel lamination (41); the upper rear transverse yoke is provided with The upper air passage (13) is located at the top of the second upper silicon steel lamination (42); the upper air passage (13) is located at the top of the upper magnetic flux guide block (43); the upper magnetic flux guide block (43) has an upper V-shaped groove (44) with an upward opening at its top; the bottom of the iron core column (3) is provided with a first lower silicon steel lamination (51), a lower magnetic flux guide block (53) and a second lower silicon steel lamination (52); the lower magnetic flux guide block (53) is located between the first lower silicon steel lamination (51) and the second lower silicon steel lamination (52); the lower front transverse yoke is located at the bottom of the first lower silicon steel lamination (51); the lower rear transverse yoke is located at the bottom of the second lower silicon steel lamination (52); the lower air passage (23) is located at the bottom of the lower magnetic flux guide block (53); the bottom of the lower magnetic flux guide block (53) has a lower V-shaped groove (54) with an downward opening at its bottom; The coil assembly (8) is wound around the iron core post (3); The cabinet (6) is provided with a baffle plate (61) and a partition plate (62); the top of the partition plate (62) forms an air inlet cavity (63); the bottom of the partition plate (62) and the baffle plate form a heat dissipation cavity (64); the cooling fan (7) is located at the bottom of the partition plate (62); the air inlet cavity (63) is provided with an air inlet; the top of the coil assembly (8), the top of the iron core column (3) and the upper transverse yoke are all located in the heat dissipation cavity (64); The cooling fan (7) is positioned directly above the top of the coil assembly (8); the cabinet (6) has an air outlet at the bottom of the heat dissipation cavity (64); The air inlet is equipped with a filter screen (65); The reactor body is coated with a three-proof paint.

2. The air-cooled photovoltaic reactor according to claim 1, characterized in that: Several upper insulating support strips (14) are provided between the upper front transverse yoke and the upper rear transverse yoke; several lower insulating support strips (24) are provided between the lower front transverse yoke and the lower rear transverse yoke; The first upper silicon steel lamination (41), the upper magnetic flux guide block (43), and the second upper silicon steel lamination (42) are set at the same height; the first lower silicon steel lamination (51), the lower magnetic flux guide block (53), and the second lower silicon steel lamination (52) are set at the same height.

3. The air-cooled photovoltaic reactor according to claim 1, characterized in that: The iron core column (3) is provided with a number of air gap blocks (31) along the height direction.

4. The air-cooled photovoltaic reactor according to claim 1, characterized in that: The upper magnetic flux guide block (43) and the lower magnetic flux guide block (53) are made of metal magnetic powder cores or are made of stacked silicon steel sheets; Both the upper V-groove (44) and the lower V-groove (54) are filled with non-magnetic material.

5. The air-cooled photovoltaic reactor according to claim 1, characterized in that: The thickness of the upper magnetic flux guide block (43) is the same as the width of the upper air passage (13); the depth of the upper V-groove (44) is greater than or equal to 1.5 times the thickness of the upper magnetic flux guide block (43); The thickness of the lower magnetic flux guide block (53) is the same as the width of the lower air passage (23); the depth of the lower V-groove (54) is greater than or equal to 1.5 times the thickness of the lower magnetic flux guide block (53); The working magnetic flux density of the core column (3) is lower than the saturation magnetic flux density of the upper magnetic flux guide block (43) and lower than the saturation magnetic flux density of the lower magnetic flux guide block (53).

6. The air-cooled photovoltaic reactor according to claim 1, characterized in that: The coil assembly (8) includes an input busbar (81), an output busbar (82), and a conductor (83); the input busbar (81) and the output busbar (82) are respectively connected to the input end and the output end of the conductor (83); The conductor (83) is wound around the iron core column (3); the conductor (83) is provided with multiple first heat dissipation channels (84); and multiple second heat dissipation channels (85) are provided between the conductor (83) and the iron core column (3).

7. A wind-cooled photovoltaic reactor according to claim 6, characterized in that: Insulating clamps (86) are provided at the front end and the rear end of the iron core column (3); right-angled insulating air duct support strips (87) are provided at the four corners of the iron core column (3); first I-shaped insulating air duct support strips (88) are provided on the left side and the right side of the iron core column (3); and a second I-shaped insulating air duct support strip (89) is provided at the first heat dissipation air duct (84) of the conductor (83). The top and bottom of the coil assembly (8) are provided with high-temperature resistant insulating silicone (80).

8. The air-cooled photovoltaic reactor according to claim 1, characterized in that: The mounting assembly includes an upper clamp (91), a lower clamp (92), a U-shaped top pressure member (93), a base (94), a longitudinal locking bolt (95), a transverse locking bolt (96), a tensioning block (97), and a shock-absorbing pad (98); The upper clamp (91) is located between the upper front transverse yoke and the iron core column (3) and between the upper rear transverse yoke and the iron core column (3); the lower clamp (92) is located between the lower front transverse yoke and the iron core column (3) and between the lower rear transverse yoke and the iron core column (3). The U-shaped top pressing member (93) is located at the top of the upper transverse yoke; the tensioning block (97) is located on the lower clamp (92); the base (94) is located at the bottom of the lower transverse yoke; the U-shaped top pressing member (93) and the tensioning block (97) are connected by the longitudinal locking bolt (95); the upper transverse yoke and the lower transverse yoke are respectively fixedly connected to the upper clamp (91) and the lower clamp (92) by the transverse locking bolt (96); The upper clamp (91) is provided with product lifting holes; the shock-absorbing pad (98) is installed at the bottom of the base (94).

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