A photovoltaic power generation dry-type transformer

Abstract

This invention discloses a photovoltaic dry-type transformer, comprising a transformer body, a transformer casing installed inside the transformer body, an air inlet box installed on the inner bottom wall of the transformer body, and an air outlet box installed on the inner top wall of the transformer body. The air inlet and air outlet boxes are located below and above the transformer casing, respectively. A rain sensor is installed on the top of the transformer body, and the rain sensor is connected to a PLC controller. The PLC controller controls the opening and closing of the exhaust valve, negative pressure fan, and air inlet valve. The beneficial effects of this invention are: by setting a rain sensor, rainfall can be detected during rain. When the rainfall reaches a set value, the PLC controller controls the air inlet and exhaust valves to close, thereby preventing air containing a lot of moisture from entering the transformer body through the air inlet and exhaust pipes during rainy weather and damaging the electrical components inside the transformer body, thus ensuring the service life of the electrical components inside the transformer body.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power generation dry-type transformer technology, and in particular to a photovoltaic power generation dry-type transformer. Background Technology

[0002] A photovoltaic (PV) dry-type transformer is a type of transformer equipment suitable for PV power generation systems. It boasts excellent safety features, including small size, light weight, fire resistance, explosion-proof properties, and moisture resistance. PV dry-type transformers play a crucial role in PV power generation systems. They are typically used to step up lower voltages to transmission voltages for long-distance power transmission. They are suitable for various PV power generation systems, including stand-alone PV power generation, centralized PV power plants, and distributed PV power generation.

[0003] To ensure the performance of dry-type transformers, ventilation holes are usually installed to allow the exchange of hot air inside the transformer with the external air. However, most existing photovoltaic dry-type transformers are installed outdoors. In rainy or snowy weather, the air contains a lot of moisture, which can enter the transformer through the ventilation holes, easily causing damage to the electrical components inside the transformer and reducing its service life, thus presenting certain limitations. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing photovoltaic power generation dry-type transformers, which are mostly installed outdoors. In rainy or snowy weather, the high moisture content in the air can enter the transformer through the ventilation holes, easily causing damage to the electrical components inside the transformer and reducing its service life. This invention provides a photovoltaic power generation dry-type transformer.

[0005] The objective of this invention is achieved through the following technical solution: A photovoltaic dry-type transformer includes a transformer body, a transformer shell installed inside the transformer body, an air inlet box installed on the inner bottom wall of the transformer body, and an air outlet box installed on the inner top wall of the transformer body. The air inlet box and the air outlet box are located below and above the transformer shell, respectively. The air inlet end of the air inlet box extends to the outside of the transformer body through an air inlet pipe, and an air inlet valve is installed on the air inlet pipe. An exhaust valve is installed at the air outlet end of the air outlet box, and the air outlet end of the exhaust valve extends to the outside of the transformer body through an exhaust pipe. A negative pressure fan is installed between the air outlet box and the exhaust valve. The air inlet box and the air outlet box are located below and above the transformer shell, respectively, which allows air to flow between the air inlet box and the air outlet box and fully exchange heat with the transformer shell, thereby improving the heat exchange efficiency of the circulating air.

[0006] A rain sensor is installed on the top of the transformer body. The rain sensor is connected to a PLC controller. The PLC controller controls the opening and closing of the exhaust valve, negative pressure fan and air intake valve respectively. By setting the rain sensor, the amount of rain can be detected when it rains. When the amount of rain reaches the set value, the PLC controller controls the air intake valve and exhaust valve to close. This prevents air containing a lot of moisture from entering the transformer body through the air intake pipe and exhaust pipe during rainy weather and damaging the electrical components inside the transformer body, thus ensuring the service life of the electrical components inside the transformer body.

[0007] The transformer body has an outer casing installed on its side, and a drainage channel is provided between the outer casing and the transformer body. The top of the transformer body has a rain collection plate corresponding to the drainage channel. The rain collection plate is set at an angle. Multiple sets of guide plates are installed at equal intervals inside the drainage channel. The guide plates are also set at an angle, and the lowest point of the guide plates contacts the outer side of the transformer body. The lowest point of the guide plates is provided with a drainage hole corresponding to the transformer body. By setting up a drainage channel, rainwater can be collected after the exhaust valve and intake valve are closed in rainy weather. The rainwater can fully contact the outer wall of the transformer body through the drainage holes on the inclined guide plates in the drainage channel, thereby exchanging heat with the transformer body. This effectively solves the heat dissipation problem of the transformer body after the exhaust valve and intake valve are closed in rainy weather, thus ensuring the heat dissipation effect of the transformer body and improving the working efficiency of the transformer body.

[0008] The outer side of the outer casing is provided with heat dissipation fins arranged at equal intervals. The heat dissipation fins are connected to the guide plate, which is a heat-conducting filter plate. The surface of the guide plate is also coated with anti-rust paint. By setting the guide plate to connect with the heat dissipation fins, the heat on the outside of the transformer body can be quickly conducted to the heat dissipation fins for heat dissipation through the guide plate, thereby effectively improving the heat dissipation effect of the transformer body.

[0009] A further technical solution involves providing air outlets on both sides of the air inlet box, connecting the air inlet pipe to the upper part of the air inlet box, and installing horizontal and vertical baffles between the air inlet pipe and the air outlets. The horizontal and vertical baffles have through holes set at equal intervals. By setting the horizontal and vertical baffles with through holes between the air inlet pipe and the air outlets, the airflow can be effectively stabilized, making the air outlets emit uniform air, thereby achieving a uniform air delivery effect and improving the heat exchange effect of the flowing air.

[0010] A further technical solution is to use a two-position three-way solenoid valve for the exhaust valve. The other outlet of the exhaust valve is connected to the air inlet box through a return pipe. By setting the exhaust valve to a two-position three-way solenoid valve and connecting it to the air inlet box through a return pipe, the negative pressure fan can circulate the air between the air inlet box and the air outlet box through the return pipe after the exhaust valve and the air inlet valve are closed in rainy weather. This allows the airflow to transfer the heat of the transformer shell in the middle of the transformer body to the side wall of the transformer body for heat dissipation, further solving the heat dissipation problem of the transformer body after the exhaust valve and the air inlet valve are closed in rainy weather, thereby ensuring the heat dissipation effect of the transformer body.

[0011] A further technical solution is to install the transformer casing on the air inlet box, and install support columns corresponding to the transformer casing inside the air inlet box. The support columns are set to improve the support effect of the air inlet box on the transformer casing and prevent the air inlet box from deforming and affecting the ventilation effect.

[0012] A further technical solution is to install a baffle corresponding to the drainage channel on the top of the transformer body. The baffle is located on the outside of the water inlet end of the drainage channel, and the rain collection plate is located on the inside of the water inlet end of the drainage channel. The baffle and the rain collection plate work together to guide rainwater into the drainage channel, thereby preventing rainwater from accumulating on the top of the transformer body. At the same time, it can increase the amount of rainwater in the drainage channel and improve the heat exchange effect of the rainwater in the drainage channel on the side wall of the transformer body.

[0013] A further technical solution is to set the air inlet of the air outlet box on both sides of the air outlet box, and both the air outlet of the air inlet box and the air inlet of the air outlet box are set opposite to the side of the transformer body. By setting both the air outlet of the air inlet box and the air inlet of the air outlet box opposite to the side of the transformer body, the flowing air carrying heat can quickly exchange heat with the side wall of the transformer body in rainy weather, and the rainwater on the outside can carry away the heat, effectively improving the heat exchange effect of the equipment.

[0014] A further technical solution is to install a temperature sensor inside the transformer body that is connected to a PLC controller. With this temperature sensor installed inside the transformer body and connected to the PLC controller, the PLC controller can shut down the negative pressure fan when the temperature inside the transformer body is lower than a set value, effectively reducing energy consumption.

[0015] A further technical solution is to install a base on the bottom surface of the transformer body, and to have an inclined part on the base that corresponds to the water outlet of the drainage channel. The inclined part can guide the water discharged from the drainage channel to the outside of the base, thus preventing rainwater from accumulating on the base.

[0016] A further technical solution is to install a first filter screen at the water inlet end of the drainage channel. Setting up the first filter screen can prevent external impurities from entering the drainage channel and causing blockage, thus affecting the drainage effect of the drainage channel.

[0017] A further technical solution is that the air inlet end of the air inlet pipe and the air outlet end of the exhaust pipe are both set downwards, and a second filter screen is installed at both the air inlet end of the air inlet pipe and the air outlet end of the exhaust pipe. The second filter screen is cylindrical. The cylindrical second filter screen can not only prevent external impurities from entering the transformer body, but also has good water permeability in rainy weather, so that rainwater can backwash the second filter screen and achieve a self-cleaning effect.

[0018] The present invention has the following advantages: 1. The present invention sets the air inlet box and the air outlet box to be located below and above the transformer shell respectively, which allows the air to flow between the air inlet box and the air outlet box and fully exchange heat with the transformer shell, thereby improving the heat exchange efficiency of the circulating air. By setting a rain sensor, the amount of rainfall can be detected when it rains. When the amount of rainfall reaches the set value, the PLC controller controls the air inlet valve and the air outlet valve to close, thereby preventing air containing a lot of moisture from entering the transformer body through the air inlet pipe and the air outlet pipe during rainy weather and causing damage to the electrical components inside the transformer body, thus ensuring the service life of the electrical components inside the transformer body.

[0019] 2. By incorporating a drainage channel, rainwater can be collected after the exhaust and intake valves are closed during rainy weather. The rainwater, passing through drainage holes on the inclined guide plate within the channel, can fully contact the outer wall of the transformer body, thus exchanging heat with the transformer. This effectively solves the heat dissipation problem of the transformer body after the exhaust and intake valves are closed during rainy weather, ensuring the transformer's heat dissipation effect and improving its operating efficiency. Attached Figure Description

[0020] Figure 1 This is a front view of the cross-sectional structure of the present invention;

[0021] Figure 2 This is a side view sectional diagram of the structure of the present invention;

[0022] Figure 3 This is a cross-sectional schematic diagram of the air inlet box in this invention;

[0023] Figure 4 This is a top view of the structure of the present invention;

[0024] Figure 5 This is a partial three-dimensional structural diagram of the guide plate in this invention;

[0025] In the diagram, 1. Transformer body; 2. Transformer casing; 3. Air inlet box; 4. Air outlet box; 5. Air inlet pipe; 6. Exhaust valve; 7. Negative pressure fan; 8. Exhaust pipe; 9. Return pipe; 10. Rain sensor; 11. Air inlet valve; 12. Base; 13. Longitudinal baffle; 14. Transverse baffle; 15. Through hole; 16. Support column; 17. Air outlet; 18. Baffle; 19. Rain collection plate; 20. Drainage channel; 21. Outer casing; 22. Guide plate; 23. Drainage hole; 24. Heat dissipation fins; 25. First filter screen; 26. Inclined part; 27. Second filter screen. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Example 1: As Figures 1-5 As shown, a photovoltaic dry-type transformer includes a transformer body 1, a transformer shell 2 installed inside the transformer body 1, an air inlet box 3 installed on the inner bottom wall of the transformer body 1, and an air outlet box 4 installed on the inner top wall of the transformer body 1. The air inlet box 3 and the air outlet box 4 are located below and above the transformer shell 2, respectively. The air inlet end of the air inlet box 3 extends to the outside of the transformer body 1 through an air inlet pipe 5, and an air inlet valve 11 is installed on the air inlet pipe 5. The air outlet end of the air outlet box 4 is equipped with an exhaust valve 6, and the air outlet end of the exhaust valve 6 extends to the outside of the transformer body 1 through an exhaust pipe 8. A negative pressure fan 7 is installed between the air outlet box 4 and the exhaust valve 6. The air inlet box 3 and the air outlet box 4 are located below and above the transformer shell 2, respectively, so that the air can flow between the air inlet box 3 and the air outlet box 4 and fully exchange heat with the transformer shell 2, thereby improving the heat exchange efficiency of the circulating air.

[0033] A rain sensor 10 is installed on the top of the transformer body 1. The rain sensor 10 is connected to a PLC controller. The PLC controller controls the opening and closing of the exhaust valve 6, the negative pressure fan 7, and the air inlet valve 11. By setting the rain sensor 10, the amount of rain can be detected when it rains. When the amount of rain reaches the set value, the PLC controller controls the air inlet valve 11 and the exhaust valve 6 to close, thereby preventing air containing a lot of moisture from entering the transformer body 1 through the air inlet pipe 5 and the exhaust pipe 8 during rainy weather and causing damage to the electrical components inside the transformer body 1, thus ensuring the service life of the electrical components inside the transformer body 1.

[0034] A housing 21 is installed on the side of the transformer body 1. A drainage channel 20 is provided between the housing 21 and the transformer body 1. A rain collection plate 19 corresponding to the drainage channel 20 is provided on the top of the transformer body 1. The rain collection plate 19 is inclined. Multiple sets of guide plates 22 are installed in the drainage channel 20 at equal intervals. The guide plates 22 are inclined. The lowest point of the guide plate 22 contacts the outer side of the transformer body 1. The lowest point of the guide plate 22 is provided with a drainage hole 23 corresponding to the transformer body 1. By setting up the drainage channel 20, rainwater can be collected after the exhaust valve 6 and the intake valve 11 are closed in rainy weather. The rainwater can fully contact the outer wall of the transformer body 1 through the drainage hole 23 on the inclined guide plate 22 in the drainage channel 20, thereby exchanging heat with the transformer body 1. This effectively solves the heat dissipation problem of the transformer body 1 after the exhaust valve 6 and the intake valve 11 are closed in rainy weather, thereby ensuring the heat dissipation effect of the transformer body 1 and improving the working efficiency of the transformer body 1.

[0035] The outer side of the outer casing 21 is provided with heat dissipation fins 24 arranged at equal intervals. The heat dissipation fins 24 are connected to the guide plate 22. The guide plate 22 is a heat-conducting filter plate. The surface of the guide plate 22 is also coated with anti-rust paint. By setting the guide plate 22 to connect with the heat dissipation fins 24, the heat on the outside of the transformer body 1 can be quickly conducted to the heat dissipation fins 24 through the guide plate 22 for heat dissipation, thereby effectively improving the heat dissipation effect of the transformer body 1.

[0036] Air outlets 17 are provided on both sides of the air inlet box 3. The air inlet pipe 5 is connected to the upper part of the air inlet box 3. A horizontal baffle plate 14 and a vertical baffle plate 13 are installed between the air inlet pipe 5 and the air outlet 17. The horizontal baffle plate 14 and the vertical baffle plate 13 are provided with through holes 15 arranged at equal intervals. By setting the horizontal baffle plate 14 and the vertical baffle plate 13 with through holes 15 between the air inlet pipe 5 and the air outlet 17, the airflow can be effectively stabilized, so that the air outlet 17 outputs air evenly, thereby achieving the effect of uniform air supply and making the heat exchange effect of the flowing air better.

[0037] The exhaust valve 6 is a two-position three-way solenoid valve. The other air outlet of the exhaust valve 6 is connected to the air inlet box 3 through the return pipe 9. By setting the exhaust valve 6 as a two-position three-way solenoid valve and connecting it to the air inlet box 3 through the return pipe 9, after the exhaust valve 6 and the air inlet valve 11 are closed in rainy weather, the negative pressure fan 7 circulates the airflow between the air inlet box 3 and the air outlet box 4 through the return pipe 9. This allows the airflow to transfer the heat of the transformer shell 2 in the middle of the transformer body 1 to the side wall of the transformer body 1 for heat dissipation. This further solves the heat dissipation problem of the transformer body 1 after the exhaust valve 6 and the air inlet valve 11 are closed in rainy weather, thereby ensuring the heat dissipation effect of the transformer body 1.

[0038] The transformer housing 2 is mounted on the air inlet box 3. The air inlet box 3 is equipped with a support column 16 corresponding to the transformer housing 2. The support column 16 is set to improve the support effect of the air inlet box 3 on the transformer housing 2 and prevent the air inlet box 3 from deforming and affecting the ventilation effect.

[0039] A baffle 18 corresponding to the drainage channel 20 is installed on the top of the transformer body 1. The baffle 18 is located on the outside of the water inlet end of the drainage channel 20, and the rain collection plate 19 is located on the inside of the water inlet end of the drainage channel 20. The baffle 18 and the rain collection plate 19 work together to guide rainwater into the drainage channel 20, thereby preventing rainwater from accumulating on the top of the transformer body 1. At the same time, it can increase the amount of rainwater in the drainage channel 20 and improve the heat exchange effect of the rainwater in the drainage channel 20 on the side wall of the transformer body 1.

[0040] The air inlet of the air outlet box 4 is located on both sides of the air outlet box 4. The air outlet of the air inlet box 3 and the air inlet of the air outlet box 4 are both located opposite to the side of the transformer body 1. By setting the air outlet of the air inlet box 3 and the air inlet of the air outlet box 4 opposite to the side of the transformer body 1, the flowing air carrying heat can quickly exchange heat with the side wall of the transformer body 1 in rainy weather, and the rainwater on the outside can carry away the heat, effectively improving the heat exchange effect of the equipment.

[0041] Example 2: Figures 1-5 As shown, a photovoltaic dry-type transformer includes a transformer body 1, a transformer shell 2 installed inside the transformer body 1, an air inlet box 3 installed on the inner bottom wall of the transformer body 1, and an air outlet box 4 installed on the inner top wall of the transformer body 1. The air inlet box 3 and the air outlet box 4 are located below and above the transformer shell 2, respectively. The air inlet end of the air inlet box 3 extends to the outside of the transformer body 1 through an air inlet pipe 5, and an air inlet valve 11 is installed on the air inlet pipe 5. The air outlet end of the air outlet box 4 is equipped with an exhaust valve 6, and the air outlet end of the exhaust valve 6 extends to the outside of the transformer body 1 through an exhaust pipe 8. A negative pressure fan 7 is installed between the air outlet box 4 and the exhaust valve 6. The air inlet box 3 and the air outlet box 4 are located below and above the transformer shell 2, respectively, so that the air can flow between the air inlet box 3 and the air outlet box 4 and fully exchange heat with the transformer shell 2, thereby improving the heat exchange efficiency of the circulating air.

[0042] A rain sensor 10 is installed on the top of the transformer body 1. The rain sensor 10 is connected to a PLC controller. The PLC controller controls the opening and closing of the exhaust valve 6, the negative pressure fan 7, and the air inlet valve 11. By setting the rain sensor 10, the amount of rain can be detected when it rains. When the amount of rain reaches the set value, the PLC controller controls the air inlet valve 11 and the exhaust valve 6 to close, thereby preventing air containing a lot of moisture from entering the transformer body 1 through the air inlet pipe 5 and the exhaust pipe 8 during rainy weather and causing damage to the electrical components inside the transformer body 1, thus ensuring the service life of the electrical components inside the transformer body 1.

[0043] A housing 21 is installed on the side of the transformer body 1. A drainage channel 20 is provided between the housing 21 and the transformer body 1. A rain collection plate 19 corresponding to the drainage channel 20 is provided on the top of the transformer body 1. The rain collection plate 19 is inclined. Multiple sets of guide plates 22 are installed in the drainage channel 20 at equal intervals. The guide plates 22 are inclined. The lowest point of the guide plate 22 contacts the outer side of the transformer body 1. The lowest point of the guide plate 22 is provided with a drainage hole 23 corresponding to the transformer body 1. By setting up the drainage channel 20, rainwater can be collected after the exhaust valve 6 and the intake valve 11 are closed in rainy weather. The rainwater can fully contact the outer wall of the transformer body 1 through the drainage hole 23 on the inclined guide plate 22 in the drainage channel 20, thereby exchanging heat with the transformer body 1. This effectively solves the heat dissipation problem of the transformer body 1 after the exhaust valve 6 and the intake valve 11 are closed in rainy weather, thereby ensuring the heat dissipation effect of the transformer body 1 and improving the working efficiency of the transformer body 1.

[0044] The outer side of the outer casing 21 is provided with heat dissipation fins 24 arranged at equal intervals. The heat dissipation fins 24 are connected to the guide plate 22. The guide plate 22 is a heat-conducting filter plate. The surface of the guide plate 22 is also coated with anti-rust paint. By setting the guide plate 22 to connect with the heat dissipation fins 24, the heat on the outside of the transformer body 1 can be quickly conducted to the heat dissipation fins 24 through the guide plate 22 for heat dissipation, thereby effectively improving the heat dissipation effect of the transformer body 1.

[0045] Air outlets 17 are provided on both sides of the air inlet box 3. The air inlet pipe 5 is connected to the upper part of the air inlet box 3. A horizontal baffle plate 14 and a vertical baffle plate 13 are installed between the air inlet pipe 5 and the air outlet 17. The horizontal baffle plate 14 and the vertical baffle plate 13 are provided with through holes 15 arranged at equal intervals. By setting the horizontal baffle plate 14 and the vertical baffle plate 13 with through holes 15 between the air inlet pipe 5 and the air outlet 17, the airflow can be effectively stabilized, so that the air outlet 17 outputs air evenly, thereby achieving the effect of uniform air supply and making the heat exchange effect of the flowing air better.

[0046] The exhaust valve 6 is a two-position three-way solenoid valve. The other air outlet of the exhaust valve 6 is connected to the air inlet box 3 through the return pipe 9. By setting the exhaust valve 6 as a two-position three-way solenoid valve and connecting it to the air inlet box 3 through the return pipe 9, the negative pressure fan 7 can circulate the airflow between the air inlet box 3 and the air outlet box 4 through the return pipe 9 after the exhaust valve 6 and the air inlet valve 11 are closed in rainy weather. This allows the airflow to transfer the heat of the transformer shell 2 in the middle of the transformer body 1 to the side wall of the transformer body 1 for heat dissipation, further solving the heat dissipation problem of the transformer body 1 after the exhaust valve 6 and the air inlet valve 11 are closed in rainy weather, thereby ensuring the heat dissipation effect of the transformer body 1.

[0047] The transformer housing 2 is mounted on the air inlet box 3. The air inlet box 3 is equipped with a support column 16 corresponding to the transformer housing 2. The support column 16 is set to improve the support effect of the air inlet box 3 on the transformer housing 2 and prevent the air inlet box 3 from deforming and affecting the ventilation effect.

[0048] A baffle 18 corresponding to the drainage channel 20 is installed on the top of the transformer body 1. The baffle 18 is located on the outside of the water inlet end of the drainage channel 20, and the rain collection plate 19 is located on the inside of the water inlet end of the drainage channel 20. The baffle 18 and the rain collection plate 19 work together to guide rainwater into the drainage channel 20, thereby preventing rainwater from accumulating on the top of the transformer body 1. At the same time, it can increase the amount of rainwater in the drainage channel 20 and improve the heat exchange effect of the rainwater in the drainage channel 20 on the side wall of the transformer body 1.

[0049] The air inlet of the air outlet box 4 is located on both sides of the air outlet box 4. The air outlet of the air inlet box 3 and the air inlet of the air outlet box 4 are both located opposite to the side of the transformer body 1. By setting the air outlet of the air inlet box 3 and the air inlet of the air outlet box 4 opposite to the side of the transformer body 1, the flowing air carrying heat can quickly exchange heat with the side wall of the transformer body 1 in rainy weather, and the rainwater on the outside can carry away the heat, effectively improving the heat exchange effect of the equipment.

[0050] A temperature sensor connected to a PLC controller is installed inside the transformer body 1. The PLC controller can shut down the negative pressure fan 7 when the temperature inside the transformer body 1 is lower than the set value, effectively reducing energy consumption.

[0051] A base 12 is mounted on the bottom surface of the transformer body 1. An inclined portion 26, corresponding to the outlet of the drainage channel 20, is provided on the base 12. The inclined portion 26 guides the water discharged from the drainage channel 20 to the outside of the base 12, preventing rainwater from accumulating on the base 12. A first filter screen 25 is installed at the inlet of the drainage channel 20. The first filter screen 25 prevents external impurities from entering the drainage channel 20 and causing blockage, thus affecting the drainage effect of the drainage channel 20.

[0052] The air inlet end of the air inlet pipe 5 and the air outlet end of the exhaust pipe 8 are both set downwards, and a second filter screen 27 is installed at both the air inlet end of the air inlet pipe 5 and the air outlet end of the exhaust pipe 8. The second filter screen 27 is cylindrical. The cylindrical second filter screen 27 can not only prevent external impurities from entering the transformer body 1, but also has good water permeability in rainy weather, so that rainwater can backwash the second filter screen 27 and achieve a self-cleaning effect.

[0053] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A photovoltaic power generation dry-type transformer, comprising a transformer body (1), wherein a transformer casing (2) is installed inside the transformer body (1), characterized in that: An air inlet box (3) is installed on the inner bottom wall of the transformer body (1), and an air outlet box (4) is installed on the inner top wall of the transformer body (1). The air inlet box (3) and the air outlet box (4) are located below and above the transformer shell (2), respectively. The air inlet end of the air inlet box (3) extends to the outside of the transformer body (1) through the air inlet pipe (5). An air inlet valve (11) is installed on the air inlet pipe (5). An exhaust valve (6) is installed at the air outlet end of the air outlet box (4). The air outlet end of the exhaust valve (6) extends to the outside of the transformer body (1) through the exhaust pipe (8). A negative pressure fan (7) is installed between the air outlet box (4) and the exhaust valve (6). The exhaust valve (6) is a two-position three-way solenoid valve. The other air outlet end of the exhaust valve (6) is connected to the air inlet box (3) through the return pipe (9). A rain sensor (10) is installed on the top of the transformer body (1). The rain sensor (10) is connected to a PLC controller. The PLC controller controls the opening and closing of the exhaust valve (6), the negative pressure fan (7), and the air inlet valve (11). The transformer body (1) has an outer shell (21) installed on its side. A drainage channel (20) is provided between the outer shell (21) and the transformer body (1). A rain collection plate (19) corresponding to the drainage channel (20) is provided on the top of the transformer body (1). The rain collection plate (19) is inclined. Multiple sets of guide plates (22) are installed in the drainage channel (20) at equal intervals. The guide plates (22) are inclined. The lowest point of the guide plate (22) is in contact with the outside of the transformer body (1). The lowest point of the guide plate (22) is provided with a drainage hole (23) corresponding to the transformer body (1). The outer side of the outer shell (21) is provided with heat dissipation fins (24) arranged at equal intervals, and the heat dissipation fins (24) are connected to the guide plate (22); Air outlets (17) are provided on both sides of the air inlet box (3). The air inlet pipe (5) is connected to the upper part of the air inlet box (3). A horizontal baffle plate (14) and a vertical baffle plate (13) are installed between the air inlet pipe (5) and the air outlet (17). The horizontal baffle plate (14) and the vertical baffle plate (13) are provided with through holes (15) arranged at equal intervals.

2. A photovoltaic power generation dry-type transformer according to claim 1, characterized in that: The transformer housing (2) is mounted on the air inlet box (3), and the air inlet box (3) is equipped with a support column (16) corresponding to the transformer housing (2).

3. A photovoltaic power generation dry-type transformer according to claim 1, characterized in that: The transformer body (1) is equipped with a baffle (18) corresponding to the drainage channel (20) on its top. The baffle (18) is located outside the water inlet end of the drainage channel (20), and the rain collection plate (19) is located inside the water inlet end of the drainage channel (20).

4. A photovoltaic power generation dry-type transformer according to claim 1, characterized in that: The air inlet of the air outlet box (4) is located on both sides of the air outlet box (4), and the air outlet of the air inlet box (3) and the air inlet of the air outlet box (4) are both located opposite to the side of the transformer body (1).

5. A photovoltaic power generation dry-type transformer according to claim 1, characterized in that: The transformer body (1) is equipped with a temperature sensor connected to the PLC controller.

6. A photovoltaic power generation dry-type transformer according to claim 1, characterized in that: The transformer body (1) has a base (12) installed on its bottom surface. The base (12) has an inclined part (26) corresponding to the water outlet of the drainage channel (20).

7. A photovoltaic power generation dry-type transformer according to claim 1, characterized in that: The inlet end of the drainage channel (20) is equipped with a first filter screen (25).

8. A photovoltaic power generation dry-type transformer according to claim 1, characterized in that: The air inlet end of the air inlet pipe (5) and the air outlet end of the exhaust pipe (8) are both set downwards, and a second filter screen (27) is installed on both the air inlet end of the air inlet pipe (5) and the air outlet end of the exhaust pipe (8). The second filter screen (27) is cylindrical.

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