An oil-immersed power transformer

Abstract

The invention discloses an oil-immersed power transformer, comprising a shell and an oil pillow fixed on the top of the shell, an oil pipe is arranged at the bottom of the oil pillow, fins are arranged on the outer wall of the shell, a blowing heat dissipation device is arranged on the outer wall of the shell, a floating block is arranged in the oil pillow, a push rod is fixedly connected to the floating block, a piston is fixedly fixed on the upper end of the push rod, a sleeve is fixedly connected to the oil pillow, the piston is slidably arranged in the sleeve, a micro switch is arranged on the top of the sleeve, a push rod is fixedly connected to the piston, and after the push rod touches the contact of the micro switch, the micro switch switches the control signal to control the blowing heat dissipation device to blow and cool the fins. The invention cooperates with the blowing heat dissipation device through the micro switch, and when the heat generation is small, the heat is dissipated through the fins in the natural state; when the heat generation is large, the blowing heat dissipation device is automatically started to work through the medium oil transmission that expands due to heat, so as to increase the heat dissipation by blowing the fins in time.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, and in particular to an oil-immersed power transformer. Background Art

[0002] Oil-immersed power transformer refers to a transformer whose windings use insulating oil as the insulating medium. It uses the principle of induction to convert current into higher or lower voltages, and uses insulating oil as a coolant and insulating agent. Through convection, the oil flows through the coils and cores, thereby reducing the operating temperature of the transformer. Oil-immersed power transformers are one of the important equipment in the power supply and distribution systems of industrial and mining enterprises and civil buildings.

[0003] The outer wall of the oil-immersed transformer is provided with heat dissipation fins. When in use, the internal components will generate heat, which is transferred to the heat dissipation fins through the dielectric oil for heat dissipation. The heat generated is different in different time periods. When the current is large, more heat is generated. At this time, the heat cannot be fully dissipated, resulting in a high internal temperature. When the current is small, less heat is generated, and the internal temperature remains at a relatively low temperature. In order to ensure the heat dissipation effect at the highest temperature, the existing practice is to increase the structural volume and increase the heat dissipation area, so that effective heat dissipation can still be achieved under the maximum current state to keep the operating temperature below the set requirements. However, this method will result in a large overall volume, a large heat dissipation structure, high product cost, and greater installation space requirements. Summary of the invention

[0004] The object of the present invention is to solve the above technical problems and provide an oil-immersed power transformer.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An oil-immersed power transformer comprises a shell and an oil pillow fixed on the top of the shell, wherein the shell is filled with dielectric oil, an oil pipe is arranged at the bottom of the oil pillow, the oil pipe is fixed on the shell to connect the inner cavity of the shell with the inner cavity of the oil pillow, fins arranged in rows for heat dissipation are arranged on the outer wall of the shell, a blowing heat dissipation device is arranged on the outer wall of the shell, a floating block is arranged in the oil pillow, a push rod is fixedly connected to the floating block, a piston is fixedly fixed to the upper end of the push rod, a sleeve is fixedly connected to the oil pillow, the piston is slidably arranged in the sleeve, a micro switch is arranged on the top of the sleeve, a push rod is fixedly connected to the piston, and when the push rod touches the contact of the micro switch, the micro switch switches a control signal to control the blowing heat dissipation device to blow air to cool the fins.

[0007] Furthermore, the air blowing and heat dissipation device includes a fan and a movable frame, the movable frame is installed on a shell, the fan includes a wind tube and a cooling motor installed in the wind tube, the output shaft of the cooling motor is fixedly connected to a rotating shaft, the rotating shaft is fixedly connected to a fan blade, the movable frame is a hollow structure, the movable frame is connected to the air outlet end of the wind tube through an air duct, a blowing pipe is installed on the movable frame, the blowing pipe extends into the gap between adjacent fins, and a blowing port for blowing air toward the fins is opened on the blowing pipe.

[0008] Furthermore, a slide rail arranged in parallel with the fin is installed on the housing, a slider is slidably connected to the slide rail, the mobile frame is fixed on the slider, a fixed plate is fixedly connected to the housing, a reciprocating screw is rotatably connected between the fixed plates, the reciprocating screw is arranged in parallel with the slide rail, a driving motor is installed on the housing, the output end of the driving motor is connected to one end of the reciprocating screw to drive the reciprocating screw to rotate, the reciprocating screw passes through the slider and cooperates with the slider to drive the slider to reciprocate. Specifically, two thread grooves with the same pitch and opposite rotation directions are arranged on the reciprocating screw, and the two ends of the two thread grooves are connected by a transition curve.

[0009] Furthermore, a cleaning brush is fixed on the outer wall of the blowing pipe, and the cleaning brush is provided with bristles. When cleaning, the bristles of the cleaning brush abut against the surface of the fin to clean the surface of the fin.

[0010] Furthermore, a flipping mechanism is provided on the movable frame, and the flipping mechanism drives the blowing tube to rotate so that the bristles abut against the fins, and drives the blowing tube to rotate until the bristles are parallel to the fins when the fan is not working.

[0011] Furthermore, a joint pipe is provided on the movable frame, one end of the blowing pipe is inserted into the joint pipe and rotated with the joint pipe, the flipping mechanism includes a transmission cylinder fixed on one side of the joint pipe, a movable block sliding along the transmission cylinder is provided in the transmission cylinder, a transmission rod is fixedly connected to the movable block, a gear coaxial with the blowing pipe is fixedly connected to the outer wall of the blowing pipe, a rack is provided on one side of the blowing pipe, the gear and the rack are meshed to form a gear and rack transmission, and the transmission rod is fixedly connected to the rack to drive the rack to move.

[0012] Furthermore, a return spring is provided in the transmission cylinder, and the return spring is located on the side of the movable block away from the joint tube to push the movable block toward the center position of the joint tube; a first limit column and a second limit column are provided in the transmission cylinder, and the first limit column and the second limit column are respectively located on both sides of the movable block to limit the moving stroke of the movable block.

[0013] Furthermore, the air blowing port is arranged between the bristles.

[0014] Furthermore, a compression spring is arranged in the sleeve, and the compression spring is located on a side of the piston away from the floating block.

[0015] Furthermore, there are multiple blowing pipes, the transmission cylinder is arranged corresponding to the blowing pipe, each mobile frame is arranged corresponding to a rack, and the gears on the blowing pipe on each mobile frame are meshed with the same rack.

[0016] The oil-immersed power transformer provided by the present invention has the following beneficial effects: when the heat generated by the transformer is relatively small, the temperature of the dielectric oil in the shell is dissipated through the heat dissipation fins, so that the temperature of the dielectric oil is maintained at a relatively low state, the dielectric oil expansion amount is small, the floating block floating amount is small, and the push rod upward movement amount is small, resulting in the push rod not being able to touch the micro switch, and the cooling task can be completed without the operation of the air blowing heat dissipation device; when the current flowing through the transformer is large, the internal heat generation increases, and the heat dissipation of the fins in a natural state cannot meet the cooling demand, so that the internal dielectric oil temperature rises to a higher temperature, the dielectric oil expands due to heat, causing the floating block to rise, and drives the push rod to push the contact of the micro switch to move, so that the state of the micro switch changes and the switching control signal controls the air blowing heat dissipation device to start the cooling work, and the air blowing heat dissipation device starts to blow air to the fins to accelerate air cooling, thereby increasing the heat dissipation, so that the dielectric oil is maintained within a reasonable range; through the above scheme, when the heat generation is small, the air blowing heat dissipation device does not start to work, and the air blowing heat dissipation device is operated in a natural state The fins are used to dissipate heat to save energy, reduce the size of the heat dissipation fins, and reduce the space occupied by the transformer installation; when the heat generation is large, the heat dissipation device is automatically started by the medium oil that expands due to heat, so as to increase the heat dissipation by blowing the fins in time, accelerate the heat dissipation, and maintain the medium oil temperature within a reasonable range; while the blowing pipe moves back and forth along the fin arrangement direction to blow air, it drives the cleaning brush to move back and forth along the fins, so as to clean the dust accumulated on the surface of the fins, avoid the accumulation of dust on the surface of the fins resulting in poor heat dissipation effect of the fins, and the cleaned dust is blown out by the air flow blown out by the blowing pipe to keep the surface of the fins clean; when the current in the transformer is small and the heat is naturally dissipated through the fins, the blowing pipe rotates until the bristles are parallel to the fins, so that the distance between the bristles and the fins is maximized, so as to facilitate the airflow to flow through the gaps between adjacent fins, so as to facilitate more efficient heat dissipation under natural wind flow, thereby avoiding the blocking of natural wind flow under the enhanced cooling effect without blowing, resulting in reduced cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0018] Figure 1 A schematic structural diagram of an oil-immersed power transformer provided by the present invention.

[0019] Figure 2A schematic side structural view of an oil-immersed power transformer provided by the present invention.

[0020] Figure 3 for Figure 1 Schematic diagram of the local structure of part A in the middle.

[0021] Figure 4 for Figure 3 Schematic diagram of the local structure of part B in the middle.

[0022] Figure 5 for Figure 1 Schematic diagram of the local structure of the middle oil pillow.

[0023] Figure 6 The present invention provides a schematic structural diagram of an oil-immersed power transformer after a blowpipe is turned over.

[0024] Figure 7 for Figure 6 Schematic diagram of the local structure of the middle oil pillow.

[0025] Figure 8 for Figure 6 Schematic diagram of the local structure of the middle C area.

[0026] Fig. 9 The present invention provides a schematic diagram of the cross-sectional structure of an air blowing pipe in an oil-immersed power transformer.

[0027] Fig.10 A schematic diagram of the coordination of a gear and a rack in an oil-immersed power transformer provided by the present invention.

[0028] Explanation of the numbers in the figure: 1. Shell; 11. Fin; 2. Oil pillow; 21. Floating block; 22. Push rod; 23. Piston; 24. Sleeve; 25. Push rod; 26. Compression spring; 3. Oil pipe; 4. Blowing and cooling device; 41. Fan; 4101. Air cylinder; 4102. Cooling motor; 4103. Fan blade; 42. Moving frame; 43. Blowing pipe; 431. Blowing port; 44. Slide rail; 45. Sliding block; 46. Fixed plate; 47. Reciprocating screw; 48. Driving motor; 49. Cleaning brush; 491. Brush hair; 410. Connecting pipe; 5. Micro switch; 6. Flipping mechanism; 61. Transmission cylinder; 62. Movable block; 63. Transmission rod; 64. Rack; 65. Gear; 66. Reset spring; 67. First limit column; 68. Second limit column. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up-down-left-right-front-back...) are only used to explain the relative position relationship - movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0032] like Figure 1-Figure 10 As shown, an oil-immersed power transformer comprises a shell 1 and an oil pillow 2 fixed on the top of the shell 1, wherein the shell 1 is filled with dielectric oil, an oil pipe 3 is arranged at the bottom of the oil pillow 2, and the oil pipe 3 is fixed on the shell 1 to connect the inner cavity of the shell 1 with the inner cavity of the oil pillow 2, and fins 11 arranged in rows for heat dissipation are arranged on the outer wall of the shell 1, and a blowing heat dissipation device 4 is arranged on the outer wall of the shell 1, a floating block 21 is arranged in the oil pillow 2, a push rod 22 is fixedly connected to the floating block 21, a piston 23 is fixed to the upper end of the push rod 22, a sleeve 24 is fixedly connected to the oil pillow 2, and the piston 23 is slidably arranged in the sleeve 24, a micro switch 5 is arranged on the top of the sleeve 24, and a push rod 25 is fixedly connected to the piston 23. After the push rod 25 touches the contact of the micro switch 5, the micro switch 5 switches the control signal to control the blowing heat dissipation device 4 to blow and cool the fins 11.

[0033] By adopting the above technical solution, when the heat generated by the transformer is relatively small, the temperature of the dielectric oil in the housing 1 is dissipated through the heat dissipation fins 11, so that the temperature of the dielectric oil is kept at a relatively low state, the expansion of the dielectric oil is small, the floating block 21 floats up a small amount, and the push rod 25 moves up a small amount, resulting in the push rod 25 not being able to touch the micro switch 5, and the cooling task can be completed without the operation of the air blowing heat dissipation device 4; when the current flowing through the transformer is large, the internal heat generation increases, and the heat dissipation of the fins 11 in the natural state cannot meet the cooling requirement, so that the internal dielectric oil temperature rises to a higher temperature, and the dielectric oil expands due to heat, causing the floating block 21 to rise, and drives the push rod 25 to push the contact of the micro switch 5 to move, so that the micro switch 5, the state change switching control signal controls the air blowing heat dissipation device 4 to start the cooling work, and the air blowing heat dissipation device 4 starts to blow air to the fins 11 to accelerate the air cooling, thereby increasing the heat dissipation, so that the medium oil is maintained within a reasonable range; through the above scheme, when the heat generation is small, the air blowing heat dissipation device 4 does not start to work, and the heat is dissipated by the fins 11 in a natural state, so as to save energy, reduce the size of the heat dissipation fins 11, and reduce the installation space occupied by the transformer; when the heat generation is large, the air blowing heat dissipation device 4 is automatically started to work through the medium oil that expands due to heat, so as to increase the heat dissipation by blowing the fins 11 in time, accelerate the heat dissipation, and maintain the medium oil temperature within a reasonable range.

[0034] Specifically, the air blowing heat dissipation device 4 includes a fan 41 and a movable frame 42, the movable frame 42 is installed on the shell 1, the fan 41 includes a wind tube 4101 and a cooling motor 4102 installed in the wind tube 4101, the output shaft of the cooling motor 4102 is fixedly connected with a rotating shaft, and the rotating shaft is fixedly connected with a fan blade 4103, the movable frame 42 is a hollow structure, the movable frame 42 is connected to the air outlet end of the wind tube 4101 through an air duct, and a blowing pipe 43 is installed on the movable frame 42, the blowing pipe 43 extends to the gap between adjacent fins 11, and the blowing pipe 43 is provided with a blowing port 431 for blowing air to the fins 11. The cooling fan 41 drives the shaft to rotate, and the shaft drives the fan blades 4103 to rotate. The rotation of the fan blades 4103 draws external air into the wind tube 4101 and transports it to the blowing pipe 43 through the air duct. The pressurized air in the blowing pipe 43 is blown out from the blowing port 431 toward the fin 11, thereby accelerating the air flow on the surface of the fin 11, making the fin 11 dissipate heat faster and improving the heat dissipation effect.

[0035] Specifically, a slide rail 44 arranged parallel to the fin 11 is installed on the housing 1, a slider 45 is slidably connected to the slide rail 44, the mobile frame 42 is fixed on the slider 45, a fixed plate 46 is fixedly connected to the housing 1, a reciprocating screw 47 is rotatably connected between the fixed plates 46, the reciprocating screw 47 is arranged parallel to the slide rail 44, a driving motor 48 is installed on the housing 1, the output end of the driving motor 48 is transmission-connected to one end of the reciprocating screw 47 to drive the reciprocating screw 47 to rotate, and the reciprocating screw 47 passes through the slider 45 and cooperates with the slider 45 to drive the slider 45 to reciprocate. Specifically, two thread grooves with the same pitch and opposite rotation directions are arranged on the reciprocating screw 47, and the two ends of the two thread grooves are connected by a transition curve. The reciprocating screw 47 is driven to rotate by the driving motor 48, and then the slider 45 is driven to slide back and forth along the slide rail 44, thereby driving the blowing pipe 43 to move back and forth to blow air back and forth to the fin 11, so that the air flow speed on the entire surface of the fin 11 is increased, thereby improving the overall heat dissipation efficiency of the fin 11.

[0036] Specifically, a cleaning brush 49 is fixed on the outer wall of the blowing pipe 43, and bristles 491 are arranged on the cleaning brush 49. When cleaning, the bristles 491 of the cleaning brush 49 abut against the surface of the fin 11 to clean the surface of the fin 11. When the blowing pipe 43 moves back and forth along the arrangement direction of the fin 11 to blow air, the cleaning brush 49 is driven to move back and forth along the fin 11, so as to clean the dust accumulated on the surface of the fin 11, so as to avoid the accumulation of dust on the surface of the fin 11 and cause the poor heat dissipation effect of the fin 11, and the cleaned dust is blown out by the airflow blown out by the blowing pipe 43 to keep the surface of the fin 11 clean, so as to avoid the accumulation of dust on the surface of the fin 11 and reduce the heat dissipation effect.

[0037] Specifically, the mobile frame 42 is provided with a flip mechanism 6, which drives the blowing pipe 43 to rotate so that the bristles 491 abut against the fins 11, and drives the blowing pipe 43 to rotate until the bristles 491 are parallel to the fins 11 when the fan 41 is not working. When the current in the transformer is small and the heat is naturally dissipated through the fins 11, the blowing pipe 43 rotates until the bristles 491 are parallel to the fins 11, so that the distance between the bristles 491 and the fins 11 is maximized, thereby facilitating the airflow to flow through the gaps between adjacent fins 11, facilitating more efficient heat dissipation under natural wind flow, thereby avoiding the blocking of natural wind flow under the condition of no blowing to enhance cooling, resulting in reduced cooling efficiency. Specifically, the micro switch 5 is electrically connected to the cooling motor 4102 and the drive motor 48 to control the start or stop of the cooling motor 4102 and the drive motor 48, thereby realizing automatic control of the start and stop of the cooling motor 4102 and the drive motor 48 according to the amount of heat generated.

[0038] Specifically, a joint tube 410 is provided on the movable frame 42, one end of the blowing tube 43 is inserted into the joint tube 410 and rotated with the joint tube 410, the flip mechanism 6 includes a transmission cylinder 61 fixed on one side of the joint tube 410, the inner cavity of the transmission cylinder 61 is connected with the inner cavity of the joint tube, a movable block 62 sliding along the transmission cylinder 61 is provided in the transmission cylinder 61, a transmission rod 63 is fixedly connected to the movable block 62, a gear 65 coaxial with the blowing tube 43 is fixedly connected to the outer wall of the blowing tube 43, a rack 64 is provided on one side of the blowing tube 43, the gear 65 is meshed with the rack 64 to form a gear 65-rack 64 transmission, and the transmission rod 63 is fixedly connected to the rack 64 to drive the rack 64 to move. When the fan 41 is working, pressurized gas is generated in the blowing pipe 43, which pushes the movable block 62 to move upward. The movable block 62 moves upward, driving the transmission rod 63 to move upward, and then drives the rack 64 to move upward. The movement of the rack 64 drives the gear 65 to rotate, and then drives the blowing pipe 43 to rotate 90°, so that the bristles 491 of the cleaning brush 49 are flipped until the bristles 491 abut against the fins 11, thereby facilitating the cleaning of the fins 11.

[0039] Specifically, a return spring 66 is provided in the transmission cylinder 61, and the return spring 66 is located on the side of the movable block 62 away from the joint tube 410 to push the movable block 62 toward the center position of the joint tube 410; a first limit column 67 and a second limit column 68 are provided in the transmission cylinder 61, and the first limit column 67 and the second limit column 68 are respectively located on both sides of the movable block 62 to limit the moving stroke of the movable block 62. When the blowing and cooling device 4 is not started, there is no pressurized gas in the blowing tube 43, and the elastic force of the return spring 66 causes the movable block 62 to move toward the center position of the connecting tube 410, thereby driving the gear 65 to rotate and causing the blowing tube 43 to rotate until the bristles 491 are parallel to the fins 11; when the blowing and cooling device 4 is started to intensify the blowing of the fins 11, the pressure of the pressurized gas in the blowing tube 43 causes the movable block 62 to move away from the center direction of the connecting tube 410, thereby driving the rack 64 to move, causing the blowing tube 43 to rotate 90° and thus causing the end of the bristles 491 on the blowing tube 43 to abut against the fins 11, so as to facilitate the cleaning of the surface of the fins 11 during the movement of the bristles 491.

[0040] Specifically, the blowing port 431 is arranged between the bristles 491. The dust cleaned by the bristles 491 can be blown out in time. A compression spring 26 is arranged in the sleeve 24, and the compression spring 26 is located on the side of the piston 23 away from the floating block 21. When the liquid level inside the oil pillow 2 is lowered, the elastic force of the compression spring 26 drives the piston 23 to move downward, driving the push rod 22 to move downward and disengage the contact of the micro switch 5. There are multiple blowing pipes 43, and the transmission cylinder 61 is arranged corresponding to the blowing pipe 43. Each mobile frame 42 is correspondingly arranged with a rack 64, and the gear 65 on the blowing pipe 43 on each mobile frame 42 is meshed with the same rack 64. Each flip mechanism 6 drives a blowing tube 4101, which is convenient for driving the blowing tube 4101 to rotate. The rack 64 is set to one, so that the blowing tube 43 keeps rotating synchronously.

[0041] It should be noted that a magnetic core and a coil wound around the magnetic core are arranged in the housing 1 to achieve the function of transforming the voltage.

[0042] The parts not involved in this technical solution can be implemented by using existing technologies.

[0043] The above shows and describes the basic principles, main features and characteristics of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of the present invention to be protected includes the attached claims and their equivalents.

Claims

1. An oil-immersed power transformer, characterized in that: The invention comprises a shell (1) and an oil pillow (2) fixed on the top of the shell (1); the shell (1) is filled with medium oil; an oil pipe (3) is arranged at the bottom of the oil pillow (2); the oil pipe (3) is fixed on the shell (1) to connect the inner cavity of the shell (1) with the inner cavity of the oil pillow (2); fins (11) arranged in rows for heat dissipation are arranged on the outer wall of the shell (1); an air-blowing heat dissipation device (4) is arranged on the outer wall of the shell (1); a floating block (21) is arranged in the oil pillow (2); the floating block (21) A push rod (22) is fixedly connected to the top, a piston (23) is fixed to the upper end of the push rod (22), a sleeve (24) is fixedly connected to the oil pillow (2), the piston (23) is slidably arranged in the sleeve (24), a micro switch (5) is arranged on the top of the sleeve (24), a push rod (25) is fixedly connected to the piston (23), and when the push rod (25) touches the contact of the micro switch (5), the micro switch (5) switches the control signal to control the air blowing heat dissipation device (4) to blow air to cool the fins (11); The air blowing heat dissipation device (4) comprises a fan (41) and a movable frame (42), wherein the movable frame (42) is mounted on the housing (1), the fan (41) comprises a wind tube (4101) and a cooling motor (4102) mounted in the wind tube (4101), a rotating shaft is fixedly connected to the output shaft of the cooling motor (4102), and a fan blade (4103) is fixedly connected to the rotating shaft, and the movable frame (42) is a hollow structure, and the movable frame (42) is connected to the air outlet end of the wind tube (4101) through an air duct, and a blowing pipe (43) is mounted on the movable frame (42), and the blowing pipe (43) extends into the gap between adjacent fins (11), and a blowing port (431) is provided on the blowing pipe (43) for blowing air toward the fins (11); The housing (1) is provided with a slide rail (44) arranged parallel to the fin (11), a slider (45) is slidably connected to the slide rail (44), the movable frame (42) is fixed to the slider (45), a fixed plate (46) is fixedly connected to the housing (1), a reciprocating screw is rotatably connected between the fixed plates (46), the reciprocating screw is arranged parallel to the slide rail (44), a driving motor (48) is installed on the housing (1), the output end of the driving motor (48) is transmission-connected to one end of the reciprocating screw to drive the reciprocating screw to rotate, the reciprocating screw passes through the slider (45) and cooperates with the slider (45) to drive the slider (45) to reciprocate; the reciprocating screw is provided with two thread grooves with the same pitch and opposite rotation directions, and the two ends of the two thread grooves are connected by a transition curve.

2. An oil-immersed power transformer according to claim 1, characterized in that: A cleaning brush (49) is fixed on the outer wall of the blowing pipe (43), and bristles (491) are arranged on the cleaning brush (49). During cleaning, the bristles (491) of the cleaning brush (49) abut against the surface of the fin (11) to clean the surface of the fin (11).

3. An oil-immersed power transformer according to claim 2, characterized in that: The movable frame (42) is provided with a flipping mechanism (6), which drives the blowing pipe (43) to rotate so that the bristles (491) abut against the fins (11), and drives the blowing pipe (43) to rotate until the bristles (491) are parallel to the fins (11) when the fan (41) is not working.

4. An oil-immersed power transformer according to claim 3, characterized in that: The movable frame (42) is provided with a joint pipe (410), one end of the blowing pipe (43) is inserted into the joint pipe (410) and is rotatably matched with the joint pipe (410), the flip mechanism (6) comprises a transmission cylinder (61) fixed to one side of the joint pipe (410), a movable block (62) sliding along the transmission cylinder (61) is provided in the transmission cylinder (61), a transmission rod (63) is fixedly connected to the movable block (62), a gear (65) coaxial with the blowing pipe (43) is fixedly connected to the outer wall of the blowing pipe (43), a rack (64) is provided on one side of the blowing pipe (43), the gear (65) meshes with the rack (64) to form a gear (65)-rack (64) transmission, and the transmission rod (63) is fixedly connected to the rack (64) to drive the rack (64) to move.

5. The oil-immersed power transformer according to claim 4, characterized in that: A return spring (66) is provided in the transmission cylinder (61), and the return spring (66) is located on a side of the movable block (62) away from the joint pipe (410) to push the movable block (62) toward the center position of the joint pipe (410); a first limit column (67) and a second limit column (68) are provided in the transmission cylinder (61), and the first limit column (67) and the second limit column (68) are respectively located on two sides of the movable block (62) to limit the moving stroke of the movable block (62).

6. The oil-immersed power transformer according to claim 2, characterized in that: The air blowing port (431) is arranged between the bristles (491).

7. An oil-immersed power transformer according to any one of claims 1 to 6, characterized in that: A compression spring (26) is arranged in the sleeve (24), and the compression spring (26) is located on a side of the piston (23) away from the floating block (21).

8. The oil-immersed power transformer according to claim 4, characterized in that: A plurality of the blowing pipes (43) are provided, the transmission cylinder (61) is provided corresponding to the blowing pipes (43), each movable frame (42) is provided corresponding to a rack (64), and the gear (65) on the blowing pipe (43) on each movable frame (42) is meshed with the same rack (64).

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