Oil-immersed transformer with explosion-proof protection structure

Abstract

The invention discloses an oil-immersed transformer with an explosion-proof protection structure, the oil-immersed transformer comprises an explosion-proof box body and an oil-immersed transformer installed in the explosion-proof box body, the top of the explosion-proof box body is fixedly provided with a small nitrogen generator, and the inner top wall of the explosion-proof box body is fixedly provided with a gas pipe; a pipeline on the small nitrogen generator is communicated with the interior of the gas pipe, the gas pipe is connected with a branch pipe communicated with the interior of the gas pipe, the branch pipe is fixedly provided with a first electric control valve, the gas pipe is provided with a second electric control valve, and the second electric control valve is located at the bottom of the branch pipe. In the aspect of flame retardance, the flame-retardant assembly is unique in design, and the movable plate, the expansion air bag, the storage box and other components are matched ingeniously. When fire extinguishing dry powder exists in the storage box and the inner wall is inclined, overheated or abnormally burnt, the push rod pulls the movable plate, nitrogen in the expansion air bag enters the storage box, the dry powder is blown out to form dry powder cloud, flames are effectively restrained, the explosion possibility is reduced, and reliable flame-retardant protection is provided for the oil-immersed transformer.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, in particular to an oil-immersed transformer with an explosion-proof protection structure. Background Art

[0002] Oil-immersed transformer is a common electrical equipment that converts high voltage into low voltage or vice versa to meet different power needs. In its structure, the windings of the transformer are immersed in insulating oil, which helps dissipate heat and insulation. With the development of technology, a variety of related technologies have emerged to ensure the safe operation of oil-immersed transformers.

[0003] However, there are still some problems with the existing oil-immersed transformer technology. In terms of traditional explosion-proof measures, although there are some protective measures, the prevention of external dust and gas may not be perfect. Once dust and certain special gases enter the transformer, they may cause explosions in the event of an electrical failure. In terms of heat dissipation, traditional heat dissipation methods may not be efficient enough and cannot accurately adjust the heat dissipation power in time according to the actual heating conditions of the transformer, which may easily cause the transformer to fail due to overheating during high-load operation, affecting its service life and work efficiency. In terms of flame retardant and explosion-proof automation control, although there are sensors for monitoring, there may be situations where the response is not sensitive enough or the control is not precise enough. For example, when the air pressure changes, the temperature rises abnormally, or smoke appears, operations such as replenishing nitrogen, exhausting, or starting flame retardant components cannot be performed quickly and accurately, thereby failing to avoid explosions and fires in time, bringing potential risks to the safe and stable operation of the power system. Therefore, professionals in this field provide an oil-immersed transformer with an explosion-proof protection structure to solve the above-mentioned problems. Summary of the invention

[0004] In view of the problems existing in the prior art, an object of the present invention is to provide an oil-immersed transformer with an explosion-proof protection structure.

[0005] To achieve the above object, the present invention adopts the following technical solution: An oil-immersed transformer with an explosion-proof protection structure comprises an explosion-proof box and an oil-immersed transformer installed therein, a small nitrogen generator is fixedly installed on the top of the explosion-proof box, an air pipe is fixedly installed on the inner top wall of the explosion-proof box, the pipeline on the small nitrogen generator is communicated with the interior of the air pipe, a branch pipe connected to the air pipe is connected to the interior of the air pipe, an electric control valve 1 is fixedly installed on the branch pipe, an electric control valve 2 is installed on the air pipe, the electric control valve 2 is located at the bottom of the branch pipe, a heat dissipation component is arranged inside the explosion-proof box, a flame retardant component is arranged on the inner wall of the explosion-proof box, the bottom end of the air pipe is communicated with the flame retardant component, an exhaust pump connected with the interior of the explosion-proof box is fixedly installed on the top of the explosion-proof box, a pressure sensor, a temperature sensor, a smoke sensor and a processor are integrated inside the explosion-proof box, and the pressure sensor, the temperature sensor, the smoke sensor, the heat dissipation component, the flame retardant component, the electric control valve 1, the electric control valve 2, the exhaust pump and the small nitrogen generator are all connected with the processor signal.

[0006] The heat dissipation component includes two storage slots, which are opened at the bottom of the explosion-proof box. Two liquid pumps are fixedly installed on the inner wall of the explosion-proof box. The liquid pumps are connected to the interior of the storage slot through pipelines. Two diversion boxes are fixedly installed on the inner wall of the explosion-proof box. The diversion boxes are located on the top of the liquid pumps and are connected to the liquid pumps. Heat pipes arranged at equal distances are fixedly connected to the inner wall of the diversion boxes. The top ends of the heat pipes pass through the explosion-proof box and extend to the interior of the storage slot. A semiconductor refrigerator is fixed on the back of the explosion-proof box. The cooling surface of the semiconductor refrigerator passes through the explosion-proof box and extends to the interior of the storage slot. The semiconductor refrigerator and the liquid pumps are both connected to the processor signal.

[0007] The flame retardant assembly includes a mounting frame, which is fixedly mounted on the inner wall of an explosion-proof housing, the oil-immersed transformer is located on the front of the mounting frame, the bottom end of the air pipe passes through and extends to the interior of the mounting frame, the front of the mounting frame is slidably connected with a movable plate, the back of the movable plate is fixedly connected with an expansion airbag, the back of the expansion airbag is mounted on the mounting frame, the front of the movable plate is fixedly mounted with evenly distributed storage boxes, the back of the storage box passes through and extends to the back of the movable plate, the interior of the storage box is filled with fire extinguishing dry powder, the back of the storage box is fixedly mounted with an electric control valve three, the back of the explosion-proof housing is fixedly mounted with a push rod, the output end of the push rod passes through the explosion-proof housing and is fixedly mounted on the movable plate, and the push rod and the electric control valve three are both connected with processor signals.

[0008] As a further description of the above technical solution: the left and right sides of the explosion-proof box are detachably connected with shielding covers, the shielding covers are provided with evenly distributed heat dissipation slots, and the heat conducting pipe is located inside the shielding covers; evenly distributed heat conducting fins are fixedly installed on the heat conducting pipes, and the heat conducting fins are located inside the explosion-proof box; A signal transmission module is integrated inside the explosion-proof box, and the signal transmission module is connected to the processor signal.

[0009] Compared with the prior art, the advantages of the present invention are: (1) In the present invention, in terms of explosion-proof and safety, the nitrogen protection system maintains the transformer pressure stability and reduces the oxygen content through a small nitrogen generator. Nitrogen also plays an important role in the flame-retardant component. The sensor monitoring and automatic control mechanism uses pressure, temperature and smoke sensors to monitor in real time and transmit signals to the processor to achieve automatic exhaust, flame retardant and other operations, improve safety, and the sealed explosion-proof box reduces the entry of external dust and gas, reducing the risk of explosion. In terms of heat dissipation, the liquid pump, shunt box and heat pipe of the heat dissipation component work together. According to the processor's control of the temperature signal, the coolant circulates to take away the heat and is cooled by the semiconductor refrigerator, thereby improving the working efficiency and life of the transformer; (2) In terms of flame retardancy, the present invention has a unique design of flame retardant components, and the movable plate, expansion airbag, storage box and other components are cleverly matched. The storage box contains fire extinguishing dry powder and the inner wall is inclined. When overheating or abnormal combustion occurs, the push rod pulls the movable plate, and the nitrogen in the expansion airbag enters the storage box, blowing out the dry powder to form a dry powder cloud, effectively suppressing the flame and reducing the possibility of explosion, providing reliable flame retardant protection for oil-immersed transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front cross-sectional structural schematic diagram of the present invention; Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle; Figure 4 It is a schematic diagram of the three-dimensional structure of the trachea part of the present invention; Figure 5 It is a schematic diagram of the side cross-sectional structure of the flame retardant assembly of the present invention; Figure 6 It is a schematic diagram of the principle of the present invention.

[0011] Description of the numbers in the figure: 1. Explosion-proof box; 2. Oil-immersed transformer; 3. Small nitrogen generator; 4. Air pipe; 5. Branch pipe; 6. Electric control valve 1; 7. Electric control valve 2; 8. Heat dissipation component; 801. Storage tank; 802. Liquid pump; 803. Diverter box; 804. Heat pipe; 805. Semiconductor refrigerator; 9. Flame retardant component; 901. Mounting frame; 902. Movable plate; 903. Inflatable airbag; 904. Storage box; 905. Electric control valve 3; 906. Push rod; 10. Exhaust pump; 11. Pressure sensor; 12. Temperature sensor; 13. Smoke sensor; 14. Processor; 15. Shielding cover; 16. Heat-conducting fins; 17. Protective shell; 18. Partition; 19. Signal transmission module; 20. Telescopic sleeve. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0013] See also Figures 1 to 6 In the present invention, an oil-immersed transformer with an explosion-proof protection structure includes an explosion-proof box 1 and an oil-immersed transformer 2 installed therein, a small nitrogen generator 3 is fixedly installed on the top of the explosion-proof box 1, an air pipe 4 is fixedly installed on the inner top wall of the explosion-proof box 1, the pipeline on the small nitrogen generator 3 is connected to the inside of the air pipe 4, the air pipe 4 is connected to a branch pipe 5 connected to the inside of the air pipe 4, an electric control valve 1 6 is fixedly installed on the branch pipe 5, an electric control valve 2 7 is installed on the air pipe 4, and the electric control valve 2 7 is located at the bottom of the branch pipe 5, and the interior of the explosion-proof box 1 is provided with A heat dissipation component 8 and a flame retardant component 9 are arranged on the inner wall of the explosion-proof box 1, the bottom end of the air pipe 4 is connected to the flame retardant component 9, an exhaust pump 10 connected to the interior of the explosion-proof box 1 is fixedly installed on the top of the explosion-proof box 1, and a pressure sensor 11, a temperature sensor 12, a smoke sensor 13 and a processor 14 are integrated in the interior of the explosion-proof box 1, and the pressure sensor 11, the temperature sensor 12, the smoke sensor 13, the heat dissipation component 8, the flame retardant component 9, the electric control valve 1 6, the electric control valve 2 7, the exhaust pump 10 and the small nitrogen generator 3 are all connected to the processor 14 signal.

[0014] The heat dissipation component 8 includes two storage slots 801, which are opened at the bottom of the explosion-proof box 1. Two liquid pumps 802 are fixedly installed on the inner wall of the explosion-proof box 1. The liquid pump 802 is connected to the interior of the storage slot 801 through a pipeline. Two diversion boxes 803 are fixedly installed on the inner wall of the explosion-proof box 1. The diversion box 803 is located on the top of the liquid pump 802 and is connected to the liquid pump 802. The inner wall of the diversion box 803 is fixedly connected with heat pipes 804 arranged at equal distances. The top of the heat pipe 804 passes through the explosion-proof box 1 and extends to the interior of the storage slot 801. A semiconductor refrigerator 805 is fixed on the back of the explosion-proof box 1. The cooling surface of the semiconductor refrigerator 805 passes through the explosion-proof box 1 and extends to the interior of the storage slot 801. The semiconductor refrigerator 805 and the liquid pump 802 are both connected to the processor 14 signal.

[0015] The flame retardant assembly 9 includes a mounting frame 901, which is fixedly mounted on the inner wall of the explosion-proof box 1. The oil-immersed transformer 2 is located on the front of the mounting frame 901. The bottom end of the air pipe 4 passes through and extends to the inside of the mounting frame 901. The front of the mounting frame 901 is slidably connected with a movable plate 902. An expansion airbag 903 is fixedly connected to the back of the movable plate 902, and the back of the expansion airbag 903 is installed on the mounting frame 901. Evenly distributed storage boxes 904 are fixedly installed on the front of the movable plate 902. The back of the storage box 904 penetrates and extends to the back of the movable plate 902. The interior of the storage box 904 is filled with fire extinguishing dry powder. An electric control valve three 905 is fixedly installed on the back of the storage box 904. A push rod 906 is fixedly installed on the back of the explosion-proof box 1. The output end of the push rod 906 penetrates the explosion-proof box 1 and is fixedly installed on the movable plate 902. The push rod 906 and the electric control valve three 905 are both connected to the processor 14 signal; the inner wall of the storage box 904 tilts downward from the front to the back.

[0016] The oil-immersed transformer 2 is installed on a mounting bracket inside the explosion-proof box 1. After assembly and debugging, the explosion-proof box 1 is in a closed state. Its internal temperature sensor 12, pressure sensor 11 and smoke sensor 13 monitor in real time and transmit signals to the processor 14. During the operation of the oil-immersed transformer 2, the closed explosion-proof box 1 will reduce the entry of external dust or gas into the explosion-proof box 1, thereby reducing the risk of explosion.

[0017] During the operation of the oil-immersed transformer 2, heat is generated. The temperature sensor 12 monitors the value. The processor 14 controls the operation of the heat dissipation component 8 according to the signal to determine the value. The power of the liquid pump 802 and the semiconductor refrigerator 805 is controlled according to the temperature to reduce energy consumption. The liquid pump 802 generates suction to extract the coolant in the storage tank 801 through the pipeline, and then the coolant is sent to the inside of the diversion box 803. As the liquid pump 802 continues to operate, the coolant is sent to the inside of multiple groups of heat pipes 804 and flows upward continuously. The heat generated by the oil-immersed transformer 2 is attached to the air and exchanges heat with the heat pipes 804, so that the coolant containing heat continues to flow upward to the outside of the explosion-proof box 1, and after heat dissipation by the external airflow, it flows back to the inside of the storage tank 801. After cooling and cooling by the semiconductor refrigerator 805, it waits to enter the inside of the heat pipe 804 again to cool the oil-immersed transformer 2.

[0018] In the above process, when the oil-immersed transformer 2 is heated up and thermal expansion or degassing occurs, the internal air pressure of the explosion-proof box 1 begins to rise. At this time, the value of the pressure sensor 11 changes, and the processor 14 controls the exhaust pump 10 to operate, so that the exhaust pump 10 discharges part of the internal gas of the oil-immersed transformer 2 to restore the internal air pressure to normal. After the temperature of the oil-immersed transformer 2 drops, the air pressure drops. At this time, the pressure sensor 11 transmits a signal to the processor 14 again. At this time, the processor 14 controls the small nitrogen generator 3 to operate, and the small nitrogen generator 3 starts and realizes gas separation to send nitrogen into the interior of the air pipe 4. At this time, the electric control valve 2 7 on the air pipe 4 is in a closed state, and the electric control valve 1 6 is opened. Nitrogen enters the interior of the explosion-proof box 1 through the branch pipe 5 to restore the air pressure and reduce the oxygen content.

[0019] During the operation of the equipment, the movable plate 902 in the flame retardant component 9 is away from the mounting frame 901 so that the expansion airbag 903 is in an expanded state, and nitrogen is filled into the expansion airbag 903 through the air pipe 4 by the small nitrogen generator 3 to make the internal air pressure higher, and the fire extinguishing dry powder is stored in the storage box 904, and the electric control valve three 905 is in a closed state. When overheating or abnormal combustion occurs during the operation of the oil-immersed transformer 2, the temperature sensor 12 and the smoke sensor 13 are triggered. At this time, the processor 14 controls the push rod 906 and the electric control valve three 905 to operate. The electric control valve three 905 is opened to allow nitrogen to enter the interior of the storage box 904, and the push rod 906 pulls the movable plate 902 to move to the back. At this time, the nitrogen in the expansion airbag 903 will be under pressure and begin to enter the interior of the storage box 904. The storage box 904 is tilted so that the nitrogen blows out the fire extinguishing dry powder and expands with it to form a dry powder cloud, so that the flame loses the combustion environment and thus achieves flame retardancy, reducing the possibility of explosion.

[0020] In the present invention, a small nitrogen generator 3 is installed on the top of the explosion-proof box 1. When the temperature of the oil-immersed transformer 2 drops and the air pressure drops, the processor 14 controls the operation of the small nitrogen generator 3 to send nitrogen into the air pipe 4. In some cases, such as when the internal air pressure of the oil-immersed transformer 2 changes, the air pressure can be restored and the oxygen content can be reduced by filling with nitrogen. For example, when the air pressure inside the transformer decreases due to temperature changes, the supplement of nitrogen can maintain the internal air pressure stable and reduce the potential risks caused by the air pressure difference. At the same time, reducing the oxygen content can prevent the occurrence of combustion and explosion. Because nitrogen is an inert gas, it can effectively inhibit the combustion reaction. Nitrogen can also be used for the flame retardant component 9. During normal operation, nitrogen is filled into the expansion airbag 903 to make its internal air pressure higher. When overheating or abnormal combustion occurs, nitrogen can blow out the fire extinguishing dry powder in the storage box 904 to form a dry powder cloud flame retardant. This design utilizes the inertness and pressure characteristics of nitrogen to ensure the safety of the transformer in dangerous situations from multiple aspects.

[0021] The explosion-proof box 1 integrates a pressure sensor 11, a temperature sensor 12 and a smoke sensor 13. These sensors monitor in real time and transmit signals to the processor 14. For example, the pressure sensor 11 can timely sense changes in internal air pressure. When the oil-immersed transformer 2 heats up and produces thermal expansion or deflates to increase the internal air pressure, the processor 14 can control the exhaust pump 10 to discharge part of the gas to restore the air pressure to normal; when overheating or abnormal combustion occurs, the temperature sensor 12 and the smoke sensor 13 are triggered, which enables the processor 14 to timely control the operation of related components to achieve flame retardancy. This automated monitoring and control mechanism greatly improves the transformer's ability to cope with dangerous situations, reduces the lag of manual intervention, and improves safety.

[0022] The oil-immersed transformer 2 is installed in a closed explosion-proof box 1. After assembly and debugging, this closed structure can reduce the entry of external dust or gas into the explosion-proof box 1. Dust and certain gases may react with substances inside the transformer or become factors that cause explosions during electrical failures. The closed structure effectively reduces this explosion risk.

[0023] The liquid pump 802, the shunt box 803 and the heat pipe 804 in the heat dissipation component 8 work together. The liquid pump 802 can extract the coolant in the storage tank 801 and send it to the shunt box 803 according to the control of the processor 14, and then flow into the heat pipe 804. For example, when the oil-immersed transformer 2 generates heat, the heat pipe 804 can exchange heat with the air containing heat, so that the coolant takes the heat out of the explosion-proof box 1, and flows back to the inside of the storage tank 801 after the heat is dissipated by the external air flow. The semiconductor refrigerator 805 can cool and cool the coolant, waiting to circulate into the inside of the heat pipe 804 again. This design realizes effective cooling of the oil-immersed transformer 2 and improves the working efficiency and service life of the transformer, because the transformer working at a suitable temperature can reduce the risk of failure caused by overheating.

[0024] The movable plate 902, the expansion airbag 903, the storage box 904 and other components in the flame retardant assembly 9 are cleverly coordinated. The storage box 904 is filled with fire extinguishing dry powder, and its inclined inner wall design is conducive to nitrogen blowing out the fire extinguishing dry powder. When overheating or abnormal combustion occurs, the push rod 906 pulls the movable plate 902, and the nitrogen in the expansion airbag 903 enters the storage box 904, so that the fire extinguishing dry powder forms a dry powder cloud. This design can quickly and effectively suppress flames, reduce the possibility of explosion, and provide reliable flame retardant protection for oil-immersed transformers.

[0025] See also Figure 1 and 2 , wherein: the left and right sides of the explosion-proof box 1 are detachably connected with a shielding cover 15 , the shielding cover 15 is provided with evenly distributed heat dissipation grooves, and the heat pipe 804 is located inside the shielding cover 15 .

[0026] In the present invention, the shielding covers 15 on both sides can protect the heat pipes 804 on the sides. The shielding covers 15 are provided with heat dissipation grooves to enable air circulation, and then partial heat dissipation can be achieved through external air during the reflux process of the coolant, reducing the difficulty of subsequent refrigeration.

[0027] See also Figure 2 , wherein: evenly distributed heat-conducting fins 16 are fixedly mounted on the heat-conducting pipe 804 , and the heat-conducting fins 16 are located inside the explosion-proof box 1 .

[0028] In the present invention, when the oil-immersed transformer 2 generates heat and diffuses it to the side, the heat-conducting fins 16 increase the contact area between the heat-conducting pipe 804 and the air, so that the heat adheres to the heat-conducting fins 16 and better exchanges heat with the coolant in the heat-conducting pipe 804.

[0029] See also Figure 1 and 2 , wherein: the top of the explosion-proof box 1 is detachably connected to a protective shell 17 , and the small nitrogen generator 3 is located inside the protective shell 17 .

[0030] In the present invention, the protective shell 17 can protect the small nitrogen generator 3, and an air inlet is provided on the protective shell 17 for the small nitrogen generator 3 to intake air.

[0031] See also Figure 2 and 3 , wherein: a partition 18 is fixedly connected to the inner wall of the storage tank 801 , and the semiconductor refrigerator 805 is located at the bottom of the partition 18 .

[0032] In the present invention, the setting of the partition 18 can divide the interior of the storage tank 801 into two parts. The part at the bottom reflux is located at the bottom of the partition 18. The coolant can enter the top of the partition 18 after being cooled by the semiconductor refrigerator 805, thereby narrowing the refrigeration range of the semiconductor refrigerator 805 and improving the refrigeration effect. At the same time, it can also make the temperature of the coolant entering the liquid pump 802 lower, which is conducive to the heat dissipation inside the explosion-proof box 1.

[0033] See also Figure 6 , wherein: a signal transmission module 19 is integrated inside the explosion-proof box 1 , and the signal transmission module 19 is connected to the processor 14 by signal.

[0034] In the present invention, when the smoke sensor 13 is triggered after the temperature exceeds the set value during the operation of the device, the processor 14 will transmit the signal through the signal transmission module 19 so that the user can understand the status of the device in time and handle it.

[0035] See also Figure 5 , wherein: the back side of the movable plate 902 is fixedly connected with evenly distributed telescopic sleeves 20 , and the back side of the telescopic sleeves 20 is installed on the inner wall of the explosion-proof box 1 .

[0036] In the present invention, the telescopic sleeve 20 can limit the movable plate 902, so that the movable plate 902 always maintains stable movement in the horizontal direction.

[0037] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An oil-immersed transformer with an explosion-proof protection structure, comprising an explosion-proof box (1) and an oil-immersed transformer (2) installed therein, characterized in that: A small nitrogen generator (3) is fixedly mounted on the top of the explosion-proof housing (1); an air pipe (4) is fixedly mounted on the inner top wall of the explosion-proof housing (1); a pipeline on the small nitrogen generator (3) is in communication with the interior of the air pipe (4); a branch pipe (5) in communication with the interior of the air pipe (4) is connected to the air pipe (4); an electric control valve 1 (6) is fixedly mounted on the branch pipe (5); an electric control valve 2 (7) is mounted on the air pipe (4); the electric control valve 2 (7) is located at the bottom of the branch pipe (5); a heat dissipation component (8) is arranged inside the explosion-proof housing (1); and a flame retardant component (9) is arranged on the inner wall of the explosion-proof housing (1). The flame retardant component (9) is connected to the bottom end of the air pipe (4) and is in communication with the flame retardant component (9). The top of the explosion-proof housing (1) is fixedly provided with an exhaust pump (10) in communication with the interior thereof. The interior of the explosion-proof housing (1) is integrated with a pressure sensor (11), a temperature sensor (12), a smoke sensor (13) and a processor (14). The pressure sensor (11), the temperature sensor (12), the smoke sensor (13), the heat dissipation component (8), the flame retardant component (9), the electric control valve 1 (6), the electric control valve 2 (7), the exhaust pump (10) and the small nitrogen generator (3) are all signal-connected to the processor (14). The heat dissipation assembly (8) comprises two storage tanks (801), the storage tanks (801) being disposed at the bottom of the explosion-proof housing (1), two liquid pumps (802) being fixedly mounted on the inner wall of the explosion-proof housing (1), the liquid pumps (802) being connected to the interior of the storage tanks (801) via pipelines, and two diversion boxes (803) being fixedly mounted on the inner wall of the explosion-proof housing (1), the diversion boxes (803) being located on the top of the liquid pumps (802) and being connected to the liquid pumps (802), the diversion boxes (803) being fixedly mounted on the inner wall of the explosion-proof housing (1), the diversion boxes (803) being located on the top of the liquid pumps (802) and being connected to the liquid pumps (802). The inner wall of the flow box (803) is fixedly connected with heat conduction pipes (804) arranged at equal distances, the top of the heat conduction pipe (804) passes through the explosion-proof box (1) and extends to the inside of the storage tank (801), the back of the explosion-proof box (1) is fixed with a semiconductor refrigerator (805), the cooling surface of the semiconductor refrigerator (805) passes through the explosion-proof box (1) and extends to the inside of the storage tank (801), and the semiconductor refrigerator (805) and the liquid pump (802) are both connected to the processor (14) by signal; The flame retardant assembly (9) comprises a mounting frame (901), the mounting frame (901) being fixedly mounted on the inner wall of the explosion-proof housing (1), the oil-immersed transformer (2) being located on the front of the mounting frame (901), the bottom end of the air pipe (4) passing through and extending into the interior of the mounting frame (901), and a movable plate (902) being slidably connected to the front of the mounting frame (901). The back of the movable plate (902) is fixedly connected to an expansion airbag (903), the back of the expansion airbag (903) is mounted on the mounting frame (901), the front of the movable plate (902) is fixedly mounted with evenly distributed storage boxes (904), the back of the storage boxes (904) penetrates and extends to the back of the movable plate (902), the interior of the storage boxes (904) is filled with fire extinguishing dry powder, the back of the storage boxes (904) is fixedly mounted with an electric control valve three (905), the back of the explosion-proof box (1) is fixedly mounted with a push rod (906), the output end of the push rod (906) penetrates the explosion-proof box (1) and is fixedly mounted on the movable plate (902), and the push rod (906) and the electric control valve three (905) are both connected to the processor (14) signal.

2. The oil-immersed transformer with explosion-proof protection structure according to claim 1, characterized in that: The left and right sides of the explosion-proof box (1) are detachably connected to shielding covers (15), the shielding covers (15) are provided with evenly distributed heat dissipation grooves, and the heat conducting pipe (804) is located inside the shielding covers (15).

3. The oil-immersed transformer with explosion-proof protection structure according to claim 1, characterized in that: Evenly distributed heat-conducting fins (16) are fixedly mounted on the heat-conducting pipe (804), and the heat-conducting fins (16) are located inside the explosion-proof box (1).

4. The oil-immersed transformer with explosion-proof protection structure according to claim 1, characterized in that: The top of the explosion-proof box (1) is detachably connected to a protective shell (17), and the small nitrogen generator (3) is located inside the protective shell (17).

5. The oil-immersed transformer with explosion-proof protection structure according to claim 1, characterized in that: A partition (18) is fixedly connected to the inner wall of the storage tank (801), and the semiconductor refrigerator (805) is located at the bottom of the partition (18).

6. The oil-immersed transformer with explosion-proof protection structure according to claim 1, characterized in that: A signal transmission module (19) is integrated inside the explosion-proof housing (1), and the signal transmission module (19) is signal-connected to the processor (14).

7. The oil-immersed transformer with explosion-proof protection structure according to claim 1, characterized in that: The inner wall of the storage box (904) is inclined downward from the front to the back.

8. The oil-immersed transformer with explosion-proof protection structure according to claim 1, characterized in that: The back side of the movable plate (902) is fixedly connected with evenly distributed telescopic sleeves (20), and the back side of the telescopic sleeves (20) is mounted on the inner wall of the explosion-proof box (1).

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