An oil-immersed power transformer with high safety

Abstract

The application relates to the technical field of transformers, in particular to an oil-immersed power transformer with high safety, which comprises a cabinet body, a fan installed on the cabinet body and a transformer body arranged in the cabinet body, a spraying mechanism arranged above heat dissipation fins of the transformer body in the cabinet body, a flow guide outlet arranged on the bottom wall of the cabinet body and a water storage pool arranged at the bottom of the cabinet body, a plurality of wet plate assemblies rotatably arranged in the water storage pool, air current after heat exchange with the heat dissipation fins is guided to flow over the water storage pool through the flow guide outlet, and water on the surface of the wet plate assemblies is vaporized to absorb heat and reduce the temperature of the cabinet body. The air current is accelerated to circulate by the fan, the heat dissipation and cooling effect is improved, the water in the water storage cavity is accelerated to vaporize when the air current flows over the water in the water storage cavity, the temperature of the environment in the cabinet body is reduced by phase change heat absorption, the heat generated by the transformer body during operation is quickly taken away, the cooling effect is further improved, and the safe and low-temperature operation of the transformer is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and specifically to an oil-immersed power transformer with high safety. Background Technology

[0002] As a core pressure-bearing and transformation device in the power transmission and distribution system, oil-immersed transformers continuously generate a large amount of heat during operation due to winding resistance loss, core hysteresis loss, and eddy current loss. If the heat cannot be dissipated in a timely and efficient manner, the temperature rise of the equipment body will exceed the standard, which will lead to problems such as accelerated aging of the insulation medium, decreased insulation performance, and increased equipment operating losses. In severe cases, it may even cause transformer overheating failure, shutdown and damage, directly affecting the stability and security of power supply in the power system.

[0003] Currently, most mainstream oil-immersed transformer cooling solutions adopt a single forced air cooling structure. The core cooling principle relies on the continuous high-speed operation of an axial fan to forcibly increase the air convection rate on the surface of the transformer's heat sink fins. By enhancing air convection heat transfer, the internal residual heat conducted by the transformer tank and heat sink fins is removed, thereby achieving equipment cooling. This traditional cooling structure is simple in construction and convenient in operation and maintenance. It can meet the basic cooling requirements under normal and low-load operating conditions of the transformer and is widely used in various conventional oil-immersed transformer equipment.

[0004] However, in practical engineering applications, this single forced air cooling mode has technical defects. First, this cooling method relies solely on single-phase airflow heat transfer for heat transfer, resulting in a single heat transfer form. It can only passively dissipate heat from the surface of the heat sink fins, and the heat exchange efficiency depends entirely on the airflow velocity and the ambient temperature difference. This leads to a low heat transfer coefficient and a limited heat dissipation limit. Second, dust easily accumulates on the surface of the heat sink fins, causing heat buildup and reducing heat dissipation efficiency. Third, under high load, overload, or high-temperature conditions, the heat generation rate of the equipment increases significantly. The heat dissipation power of the traditional air-cooled structure cannot match the high heat generation rate, easily leading to lag in heat dissipation and insufficient cooling, resulting in persistently high operating temperatures of the transformer. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides an oil-immersed power transformer with higher safety to solve the above problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A high-safety oil-immersed power transformer includes a cabinet, a fan mounted on the cabinet, and a transformer body inside. A spray mechanism is installed inside the cabinet above the heat dissipation fins of the transformer body. A guide outlet is provided on the bottom wall of the cabinet, and a water storage tank is provided at its bottom. Several wet plate assemblies are rotatably installed inside the water storage tank. After the airflow output by the fan exchanges heat with the heat dissipation fins, the airflow is guided by the guide outlet and flows over the water storage tank. The moisture on the surface of the wet plate assemblies vaporizes and absorbs heat, reducing the temperature of the cabinet.

[0007] When the multiple wet plate assemblies are rotated to a flush position, they form a sealing panel that blocks the top opening of the water storage tank.

[0008] Preferably, the cabinet includes a box and spray chambers installed on both sides of the box, the transformer body is installed inside the box, the heat dissipation fins of the transformer body extend out of the box and into the interior of the spray chamber, and the fan is installed on the side wall of the spray chamber.

[0009] Preferably, the spraying mechanism includes a heat exchange tube assembly and a spray box installed inside the spraying chamber. The spray box is equipped with a plurality of spray heads, which are arranged facing the heat dissipation fins. The heat exchange tube assembly is arranged on the side wall of the box and is equipped with a solenoid valve. The output end of the solenoid valve is in fluid communication with the spray box.

[0010] Preferably, the water storage tank is equipped with a partition that divides the internal space of the water storage tank into a sedimentation chamber and a water storage chamber; the guide outlet is opened on the bottom wall of the spray chamber, and the location of the guide outlet matches that of the sedimentation chamber. The partition is provided with a vent and a filter layer. The filter layer is located below the vent, and an exhaust port is provided on the side of the water storage tank away from the diversion outlet.

[0011] Preferably, the wet plate assembly includes a central tube rotatably disposed in the water storage chamber, a water-absorbing plate fixedly connected to the central tube, a water-proof layer provided on the back side of the water-absorbing plate, a float provided on one side of the water-absorbing plate, and a counterweight provided at the edge of that side.

[0012] Preferably, one end of the central tube penetrates the side wall of the water storage tank, and a transmission wheel is coaxially connected to the central tube located outside the water storage tank. Multiple transmission wheels are linked together by a transmission belt.

[0013] Preferably, a sleeve is rotatably mounted on one of the central tubes, the inner wall of the sleeve is in contact with the outer surface of the central tube, a connecting hole is provided on the side wall of the central tube located inside the sleeve, and the central tube is provided with several water replenishment holes.

[0014] Preferably, one side of the sleeve is provided with a connecting pipe, and it also includes a water supply pipe fixedly installed on the water storage tank. The input end of the connecting pipe is in fluid communication with the water supply pipe. When the central tube is rotated to the point where the connecting hole corresponds to the output end of the connecting pipe, the central tube and the water supply pipe are in fluid communication through the connecting pipe, and the output end of the water supply pipe is in fluid communication with the input end of the heat exchange tube group.

[0015] Preferably, a limiting ring is coaxially rotatably sleeved on one of the central tubes, a stop is provided inside the limiting ring, and a protrusion matching the stop is provided on the central tube located inside the limiting ring; A turntable is provided on one side of the limiting ring, and an electric telescopic rod is hinged to the water storage tank. The free end of the electric telescopic rod is hinged to the turntable. When the free end of the electric telescopic rod retracts, it drives the limiting ring to rotate so that the stop block abuts against the protrusion, and the end of the water suction plate away from the counterweight rotates downward to immerse in water.

[0016] Preferably, the transformer body is equipped with a temperature sensor, and the solenoid valve and the electric telescopic rod are both electrically connected to the temperature sensor.

[0017] The beneficial effects of this invention are as follows: 1. This invention accelerates air circulation through a fan, improving heat dissipation and cooling effect. Combined with the bottom water storage tank, when the airflow passes over the water inside the storage chamber, it can accelerate the vaporization of the water, reduce the internal ambient temperature of the cabinet through phase change heat absorption, and quickly remove the heat generated by the transformer body during operation, further improving the cooling effect and ensuring the safe low-temperature operation of the transformer.

[0018] 2. This invention, by setting up a spray mechanism, automatically activates the spray mechanism to spray the heat dissipation fins to quickly cool them down when the transformer body temperature is too high, thereby reducing the transformer operating temperature, ensuring the safe operation of the equipment, and preventing dust accumulation on the heat dissipation fins from affecting the heat dissipation effect.

[0019] 3. When the temperature rise of the transformer body exceeds the preset threshold, the present invention automatically switches to the wet plate vaporization forced cooling working mode. The water absorption plate automatically rotates to form an inclined arrangement, and the end with the counterweight is submerged in the water. At this time, when the airflow passes over the water storage chamber, it accelerates the vaporization phase change of the water on the surface of the water storage chamber. On the other hand, the airflow passes over and wets the surface of the water absorption plate, realizing the evaporation of water on the plate surface, enhancing the evaporation cooling effect, suppressing the temperature rise of the equipment, and ensuring the stable operation of the transformer.

[0020] 4. In the wet plate vaporization forced cooling working mode of the present invention, the electric telescopic rod performs periodic reciprocating telescopic movements, and the water absorption plate rotates intermittently, so that the suspended end of the water absorption plate is intermittently flipped downward and immersed in the water, completing the water replenishment and wetting of the suspended end, ensuring the water content and evaporative heat dissipation performance of the entire water absorption plate, and enabling the transformer to operate safely and stably.

[0021] 5. During the operation of this invention, as vaporization and cooling proceed, the water level in the storage chamber gradually decreases. When the water level drops to a set value, the connecting hole and the output end of the pipe automatically align, and the water supply pipe injects water into the storage chamber, realizing the automatic water replenishment function of this invention. This avoids the water level in the storage chamber being too low, which would prevent the water absorption plate from being adequately wetted and affect the cooling effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a top-view cross-sectional structural diagram of the present invention.

[0024] Figure 3 This is a cross-sectional view of the spray chamber of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of the water storage tank of the present invention.

[0026] Figure 5 This is a schematic diagram of the structure of the sleeve of the present invention.

[0027] Figure 6 This is a schematic diagram of the water absorption plate of the present invention.

[0028] Figure 7 This is a schematic diagram of the structure of the waterproof layer of the present invention.

[0029] Figure 8 For the present invention Figure 4 A magnified structural diagram of part A in the middle.

[0030] Figure 9 This is a cross-sectional view of the limiting ring of the present invention.

[0031] In the attached diagram: 1. Transformer body; 2. Heat dissipation fins; 3. Water storage tank; 4. Flow outlet; 5. Box; 6. Spray chamber; 7. Heat exchange tube assembly; 8. Spray box; 9. Spray head; 10. Electric telescopic rod; 11. Partition plate; 12. Sedimentation chamber; 13. Water storage chamber; 14. Vent; 15. Filter layer; 16. Central tube; 17. Water absorption plate; 18. Water-proof layer; 19. Counterweight; 20. Float; 21. Drive wheel; 22. Drive belt; 23. Connecting hole; 24. Sleeve; 25. Connecting pipe; 26. Water supply pipe; 27. Limiting ring; 28. Stop block; 29. ​​Protrusion; 30. Turntable; 31. Water inlet hole; 32. Exhaust port. Detailed Implementation

[0032] The following will be for reference. Figures 1 to 9 The various embodiments of the present invention will be described in detail below. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0033] First embodiment: A type of oil-immersed power transformer with high safety, such as Figures 1-3 As shown, the device includes a cabinet, on which a fan is installed and inside which a transformer body 1 is installed. Inside the cabinet, above the heat dissipation fins 2 of the transformer body 1, a spray mechanism is installed. The bottom wall of the cabinet has a guide outlet 4 and a water storage tank 3 at its bottom. In this embodiment, the device accelerates air circulation through the fan to improve the heat dissipation and cooling effect. Combined with the setting of the bottom water storage tank 3, when the airflow flows over the water storage tank 3, the water vaporizes and absorbs heat to reduce the temperature of the cabinet, quickly carrying away the heat generated by the operation of the transformer body 1, further improving the cooling effect.

[0034] This device is equipped with a spray mechanism. When the temperature of the transformer body 1 is too high, the spray mechanism is activated to spray the heat dissipation fins 2 for rapid cooling, thereby improving the safety of equipment operation. In addition, the spraying can prevent dust from accumulating on the heat dissipation fins 2, which would affect the heat dissipation effect.

[0035] The cabinet includes a housing 5 and spray chambers 6 installed on both sides of the housing 5. The transformer body 1 is installed inside the housing 5. The heat dissipation fins 2 of the transformer body 1 extend out of the housing 5 and into the interior of the spray chamber 6. The fan is installed on the side wall of the spray chamber 6 and is not shown. The heat dissipation fins 2 extend into the independent spray chamber 6, which can target the heat dissipation structure for centralized cooling, prevent moisture from contacting the transformer body 1, improve the heat dissipation effect and ensure the safety of the equipment. After the fan is started, it can accelerate the air convection inside the spray chamber 6 and enhance the heat dissipation efficiency.

[0036] The spraying mechanism includes a heat exchange tube assembly 7 and a spray box 8. Both the heat exchange tube assembly 7 and the spray box 8 are fixedly assembled inside the spray chamber 6. Several spray heads 9 are evenly arranged in an array at the lower end of the spray box 8. The spray ends of all spray heads 9 are set directly facing the surface of the heat dissipation fins 2. The heat exchange tube assembly 7 is fixed to the inner wall of the box body 5. A solenoid valve is installed on the pipeline of the heat exchange tube assembly 7. The output end of the solenoid valve is connected to the fluid inside the spray box 8. The solenoid valve is not shown. It also includes a water supply pipe 26 fixedly installed on the water storage tank 3. The input end of the water supply pipe 26 is connected to the water supply equipment, such as a circulating water pump. The output end of the water supply pipe 26 is connected to the input end of the heat exchange tube assembly 7.

[0037] When this device is working, the heat exchange tube group 7 cools the box 5 and improves the heat dissipation effect. The solenoid valve controls the opening and closing of the pipeline according to the equipment temperature signal. When the solenoid valve is open, the water in the heat exchange tube group 7 flows into the interior of the spray box 8 and is sprayed onto the surface of the heat dissipation fins 2 through the spray head 9. The heat dissipation fins 2 are cooled down quickly by liquid spraying heat exchange, thereby reducing the operating temperature of the transformer.

[0038] like Figure 3 and Figure 4 As shown, the water storage tank 3 is equipped with a partition 11, which divides the internal space of the water storage tank 3 into a sedimentation chamber 12 and a water storage chamber 13; the guide outlet 4 is opened on the bottom wall of the spray chamber 6, and the position of the guide outlet 4 matches the sedimentation chamber 12 to realize the directional guide and recycling of spray wastewater; the partition 11 is equipped with a vent 14 and a filter layer 15, the filter layer 15 is located below the vent 14, and the water storage tank 3 is provided with an exhaust port 32 on the side away from the guide outlet 4.

[0039] Wastewater generated by spray cooling flows into sedimentation chamber 12 through guide outlet 4. After being filtered by filter layer 15, the wastewater flows into the interior of water storage chamber 13. Impurities are intercepted in sedimentation chamber 12 and settle downwards, realizing the recycling of wastewater resources.

[0040] A temperature sensor is installed on the transformer body 1. The temperature sensor is used to monitor the temperature of the transformer body 1 in real time. The solenoid valve is electrically connected to the temperature sensor.

[0041] Working principle: During normal operation, the fan runs continuously to accelerate the air circulation inside the spray chamber 6 to improve the heat dissipation of the transformer. The airflow flows into the sedimentation chamber 12 through the guide outlet 4 and enters the water storage chamber 13 through the vent 14, and finally exits from the exhaust port 32. It should be noted that when the airflow passes over the water in the water storage chamber 13, it can accelerate the vaporization of the water, reduce the internal ambient temperature of the cabinet through phase change heat absorption, improve the overall heat dissipation effect, and ensure the stable operation of the transformer.

[0042] It is worth noting that this device is equipped with a control system, such as a PLC controller. During normal operation, if the temperature rise causes the transformer body 1 to become too high, the temperature sensor sends a signal to the control system. The control system then controls the solenoid valve to open, and the water in the heat exchange tube group 7 flows into the spray box 8 and is sprayed onto the surface of the heat dissipation fins 2 through the spray head 9. The heat dissipation fins 2 are cooled down quickly by using liquid spray heat exchange, thereby reducing the operating temperature of the transformer.

[0043] Second embodiment: Based on the first embodiment, such as Figure 4 , Figure 6 and Figure 7 As shown, several wet plate assemblies are rotatably installed inside the water storage tank 3. After the airflow output by the fan accelerates the cooling of the heat dissipation fins 2, the airflow is guided by the guide outlet 4 and passes over the water storage tank 3. The water on the surface of the wet plate assembly vaporizes and absorbs heat to reduce the temperature of the cabinet. In this embodiment, the wet plate assembly is arranged at an angle when in use. By replacing the traditional static water storage and heat dissipation structure with the wet plate assembly, the contact area between the water and the airflow is increased, the water vaporization heat dissipation efficiency is enhanced, and the heat dissipation and cooling effect of the transformer is further improved.

[0044] When multiple wet plate assemblies rotate to the flush position, they form a sealing panel that blocks the top opening of the water storage tank 3. When the equipment is stopped or in low temperature conditions, the multiple wet plate assemblies close to block the top opening of the water storage tank 3, which can prevent the water inside the cavity from evaporating and being lost.

[0045] The wet plate assembly includes a central tube 16 rotatably disposed within a water storage chamber 13, with a water-absorbing plate 17 fixedly connected to the central tube 16. The water-absorbing plate 17 is made of a hydrophilic material, and a water-proof layer 18 is provided on the back side of the water-absorbing plate 17. The water-proof layer 18 is a thin plastic sheet. A float 20 is provided on one side of the water-absorbing plate 17, and a counterweight 19 is provided at the edge of that side. When the device in this embodiment is in use, the end of the water-absorbing plate 17 with the counterweight 19 is immersed in water through the cooperation of the float 20 and the counterweight 19, so that the water-absorbing plate 17 is tilted. When the airflow passes over the water storage chamber 13, it not only accelerates the vaporization of the water on the surface, but also drives the water on the water-absorbing plate 17 to vaporize, increasing the contact area between the water and the airflow, and further improving the overall heat dissipation effect.

[0046] When multiple water-absorbing plates 17 are rotated to be flush, multiple water-proof layers 18 form a sealing plate to block the top opening of the water storage tank 3, thereby preventing the water inside the water storage chamber 13 from being lost due to ineffective evaporation.

[0047] It should be noted that, through the coordinated arrangement of the float 20 and the counterweight 19, the water-absorbing plate 17 can adaptively adjust its rotation angle, so that one end of the water-absorbing plate 17 is stably immersed in the water, ensuring that the water-absorbing plate 17 is continuously immersed in water on one side, providing a stable water source for vaporization and heat dissipation.

[0048] like Figure 4 and Figure 8 As shown, one end of the central tube 16 penetrates the side wall of the water storage tank 3. A transmission wheel 21 is coaxially connected to the central tube 16 located outside the water storage tank 3. Multiple transmission wheels 21 are linked together by a transmission belt 22. In this embodiment, the transmission wheel 21 is a gear and the transmission belt 22 is a toothed belt. Through the cooperation of the transmission wheel 21 and the transmission belt 22, single-end drive and synchronous adjustment of multiple wet plates are achieved, ensuring that the rotation angle of all water absorption plates 17 is consistent.

[0049] like Figure 4 and Figure 5 As shown, a sleeve 24 is rotatably mounted on one of the central tubes 16. The inner wall of the sleeve 24 is in contact with the outer surface of the central tube 16. A connecting hole 23 is provided on the side wall of the central tube 16 located inside the sleeve 24. The central tube 16 is provided with several water supply holes 31. A connecting pipe 25 is provided on one side of the sleeve 24. The input end of the connecting pipe 25 is in fluid communication with the water supply pipe 26.

[0050] It should be noted that as vaporization and heat dissipation proceed, the water level in the water storage chamber 13 gradually decreases, the float 20 moves down, causing the water suction plate 17 and the central tube 16 to rotate clockwise. When the water level drops to the set value, the central tube 16 rotates to align with the output end of the connecting hole 23 and the connecting pipe 25. The central tube 16 and the water supply pipe 26 are connected by fluid through the connecting pipe 25. The water in the water supply pipe 26 passes through the connecting pipe 25, the connecting hole 23, and the central tube 16 in sequence, and is finally discharged into the interior of the water storage chamber 13 through the water replenishment hole 31, realizing automatic water replenishment. This avoids the water level in the water storage chamber 13 being too low, which would prevent the water suction plate 17 from being fully wetted and affect the cooling effect.

[0051] like Figure 4 , Figure 8 and Figure 9 As shown, a limiting ring 27 is coaxially rotatably sleeved on one of the central tubes 16. A stop block 28 is provided inside the limiting ring 27. A protrusion 29 matching the stop block 28 is provided on the central tube 16 located inside the limiting ring 27. A turntable 30 is provided on one side of the limiting ring 27. An electric telescopic rod 10 is hinged to the water storage tank 3. The free end of the electric telescopic rod 10 is hinged to the turntable 30. The rotation stroke and angle of the central tube 16 are limited by the cooperation of the stop block 28 and the protrusion 29. When the free end of the electric telescopic rod 10 retracts, it drives the limiting ring 27 to rotate so that the stop block 28 abuts against the protrusion 29. The end of the water absorption plate 17 away from the counterweight 19 rotates downward to immerse in water.

[0052] The electric telescopic rod 10 is electrically connected to the temperature sensor, which monitors the temperature rise of the transformer in real time. The control system triggers the telescopic rod 10 to extend or retract according to the preset temperature threshold, thereby switching and adjusting the position of the water suction plate 17 to adapt to different working conditions of the device.

[0053] Working principle: When the equipment is stopped or in low temperature conditions, the stop block 28 abuts against the protrusion 29 to limit the position of the water absorption plate 17. Multiple water absorption plates 17 are arranged in the same horizontal plane and are closed and sealed to block the upper opening of the water storage chamber 13, which can reduce the evaporation of water inside the chamber and reduce unnecessary water loss.

[0054] When the temperature rise of the transformer body 1 exceeds the preset threshold, the temperature sensor collects the temperature signal in real time and uploads it to the control system. The control system issues a drive command, and the device switches to the wet plate vaporization forced cooling working mode, driving the free end of the electric telescopic rod 10 to unfold. The turntable 30 drives the limit ring 27 and the stop block 28 to rotate clockwise. The stop block 28 no longer abuts against the protrusion 29, releasing the contact limit constraint between the stop block 28 and the protrusion 29. Under the action of the gravitational potential energy of the counterweight 19, the end of the water absorption plate 17 with the counterweight 19 sinks into the water, and the water absorption plate 17 is inclined. At this time, when the airflow passes over the water storage chamber 13, it accelerates the vaporization phase change of the water on the liquid surface of the water storage chamber 13 on the one hand, and the airflow passes over and wets the surface of the water absorption plate 17 to realize the evaporation of water on the plate surface, enhance the evaporation cooling effect, suppress the temperature rise of the equipment, and ensure the stable operation of the transformer.

[0055] It should be noted that the water-absorbing plate 17 continuously draws water from the water storage chamber 13 for replenishment by relying on the siphon capillary force. However, during the continuous vaporization process, the water evaporation rate at the end of the water-absorbing plate 17 away from the counterweight 19 is higher than the capillary water supply rate, which causes the water-absorbing plate 17 to form a humidity gradient distribution from top to bottom. The water content at the suspended end is consistently low, resulting in a decrease in the overall utilization rate of the water-absorbing plate 17 and a reduction in its heat exchange and heat dissipation performance.

[0056] To address the aforementioned deficiencies, this device relies on the preset timing control logic of the control system to drive the electric telescopic rod 10 to perform periodic reciprocating telescopic movements. During the retraction of the electric telescopic rod 10, it drives the limit ring 27 to rotate counterclockwise, and the stop block 28 presses against the protrusion 29, causing the central tube 16 to drive the water-absorbing plate 17 to rotate counterclockwise. The suspended end of the water-absorbing plate 17 flips downward and is immersed in the water, completing the water replenishment and wetting of the suspended end, ensuring the water content and evaporative heat dissipation performance of the entire water-absorbing plate 17, and enabling the transformer to operate safely and stably.

[0057] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 according to the specific circumstances.

[0059] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A high-safety oil-immersed power transformer, comprising a cabinet, a fan mounted on the cabinet, and a transformer body (1) disposed inside the cabinet, characterized in that, The cabinet is equipped with a spray mechanism located above the heat dissipation fins (2) of the transformer body (1). The bottom wall of the cabinet is provided with a guide outlet (4) and a water storage tank (3) is provided at its bottom. Several wet plate assemblies are rotatably arranged inside the water storage tank (3). After the airflow output by the fan exchanges heat with the heat dissipation fins (2), the airflow is guided by the guide outlet (4) and passes over the water storage tank (3). The moisture on the surface of the wet plate assembly vaporizes and absorbs heat to reduce the temperature of the cabinet. When the multiple wet plate assemblies are rotated to the flush position, they form a sealing panel that seals the top opening of the water storage tank (3).

2. The oil-immersed power transformer with high safety according to claim 1, characterized in that, The cabinet includes a box (5) and spray chambers (6) installed on both sides of the box (5). The transformer body (1) is installed inside the box (5). The heat dissipation fins (2) of the transformer body (1) extend out of the box (5) and into the spray chamber (6). The fan is installed on the side wall of the spray chamber (6).

3. The oil-immersed power transformer with high safety according to claim 2, characterized in that, The spraying mechanism includes a heat exchange tube assembly (7) and a spray box (8) installed inside the spray chamber (6). The spray box (8) is provided with several spray heads (9), which are arranged facing the heat dissipation fins (2). The heat exchange tube assembly (7) is arranged on the side wall of the box body (5). The heat exchange tube assembly (7) is provided with a solenoid valve, and the output end of the solenoid valve is in fluid communication with the spray box (8).

4. The oil-immersed power transformer with high safety according to claim 3, characterized in that, The water storage tank (3) is equipped with a partition (11) inside, which divides the space inside the water storage tank (3) into a sedimentation chamber (12) and a water storage chamber (13); the guide outlet (4) is opened on the bottom wall of the spray chamber (6), and the location of the guide outlet (4) matches the sedimentation chamber (12); The partition (11) is provided with a vent (14) and a filter layer (15). The filter layer (15) is located below the vent (14). The water storage tank (3) is provided with an exhaust port (32) on the side away from the guide outlet (4).

5. A highly safe oil-immersed power transformer according to claim 4, characterized in that, The wet plate assembly includes a central tube (16) rotatably disposed in a water storage chamber (13), a water-absorbing plate (17) fixedly connected to the central tube (16), a water-proof layer (18) provided on the back side of the water-absorbing plate (17), a float (20) provided on one side of the water-absorbing plate (17), and a counterweight (19) provided at the edge of the side.

6. A highly safe oil-immersed power transformer according to claim 5, characterized in that, One end of the central tube (16) penetrates the side wall of the water storage tank (3). A transmission wheel (21) is coaxially connected to the central tube (16) located outside the water storage tank (3). Multiple transmission wheels (21) are linked together by a transmission belt (22).

7. A highly safe oil-immersed power transformer according to claim 5, characterized in that, A sleeve (24) is rotatably mounted on one of the central tubes (16). The inner wall of the sleeve (24) is in contact with the outer surface of the central tube (16). A connecting hole (23) is provided on the side wall of the central tube (16) located inside the sleeve (24). Several water supply holes (31) are provided on the central tube (16).

8. A highly safe oil-immersed power transformer according to claim 7, characterized in that, The sleeve (24) is provided with a connecting pipe (25) on one side, and also includes a water supply pipe (26) fixedly installed on the water storage tank (3). The input end of the connecting pipe (25) is in fluid communication with the water supply pipe (26). When the central tube (16) is rotated to the point where the connecting hole (23) corresponds to the output end of the connecting pipe (25), the central tube (16) and the water supply pipe (26) are in fluid communication through the connecting pipe (25), and the output end of the water supply pipe (26) is in fluid communication with the input end of the heat exchange tube group (7).

9. A highly safe oil-immersed power transformer according to claim 5, characterized in that, A limiting ring (27) is coaxially rotatably sleeved on one of the central tubes (16). A stop (28) is provided inside the limiting ring (27). A protrusion (29) matching the stop (28) is provided on the central tube (16) located inside the limiting ring (27). A turntable (30) is provided on one side of the limiting ring (27), and an electric telescopic rod (10) is hinged on the water storage tank (3). The free end of the electric telescopic rod (10) is hinged to the turntable (30). When the free end of the electric telescopic rod (10) retracts, it drives the limiting ring (27) to rotate so that the stop block (28) abuts against the protrusion (29), and the end of the water absorption plate (17) away from the counterweight block (19) rotates downward to immerse in water.

10. A highly safe oil-immersed power transformer according to claim 9, characterized in that, The transformer body (1) is equipped with a temperature sensor, and the solenoid valve and the electric telescopic rod (10) are electrically connected to the temperature sensor.

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