Oil immersed transformer

Abstract

The invention provides an oil-immersed transformer, and relates to the technical field of transformers, the oil-immersed transformer comprises an oil-immersed transformer shell, one end of the oil-immersed transformer shell is provided with a pair of pressure measuring ports for monitoring the internal oil temperature, and the periphery of the oil-immersed transformer shell is provided with two driving frames which are arranged in an up-down mirroring manner; the oil-immersed transformer further comprises two heat dissipation assemblies installed at the front end and the rear end of the oil-immersed transformer shell and driven by a driving frame to deform, a driving assembly installed at one side end of the oil-immersed transformer shell so as to drive the heat dissipation fins to swing to improve the heat dissipation effect, and a cleaning assembly installed on the oil-immersed transformer shell so as to conduct self-cleaning on the heat dissipation fins. According to the technical scheme, the heat dissipation efficiency is improved by driving the heat dissipation fins to continuously swing, the swing amplitude of the heat dissipation fins is linked with the oil temperature, more energy is saved, consumption is reduced, meanwhile, the cleaning assembly is combined with mechanical vibration and airflow scouring, and the dust accumulation problem of the heat dissipation fins is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and more particularly to an oil-immersed transformer. Background Technology

[0002] An oil-immersed transformer is a type of transformer in which the transformer body is immersed in an oil tank. It uses oil as the primary insulation and cooling medium. Furthermore, the oil in the tank effectively protects the core and windings from moisture in the air. Therefore, oil-immersed transformers are currently a popular type of transformer.

[0003] Existing oil-immersed transformers mainly rely on heat dissipation fins on the outer wall of the tank for heat dissipation. Although the heat dissipation effect can be improved by increasing the heat dissipation area, the static heat dissipation effect is relatively limited. In addition, during long-term use, the heat dissipation fins on the outside of the transformer are easily covered by dust, which will further reduce the heat dissipation effect. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing oil-immersed transformers, which use a static heat dissipation mode, resulting in limited heat dissipation effect. Furthermore, during long-term use, the external heat dissipation fins of the transformer are easily covered by dust, further reducing the heat dissipation effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an oil-immersed transformer, comprising an oil-immersed transformer casing, wherein a pair of pressure testing ports are provided at one end of the oil-immersed transformer casing for monitoring the internal oil temperature, two drive frames arranged in a vertically mirrored configuration are arranged around the periphery of the oil-immersed transformer casing, and a longitudinally arranged spring rod sleeve is fixedly installed at the other end of the oil-immersed transformer casing, wherein one side of the drive frame is inserted into the spring rod sleeve for stability, and further comprising:

[0006] Two heat dissipation components are installed at the front and rear ends of the oil-immersed transformer housing and are driven to deform by the drive frame. The heat dissipation components include a heat dissipation plate, heat dissipation fins and a connecting seat.

[0007] A drive assembly installed on one side of the oil-immersed transformer housing drives the heat sink fins to swing to improve heat dissipation. The drive assembly includes a drive plate, an I-beam frame, and a hydraulic cylinder.

[0008] A cleaning assembly is installed on the housing of the oil-immersed transformer. The cleaning assembly has two pairs and is symmetrically arranged at the front and rear ends of the housing to perform self-cleaning on the heat dissipation fins. The cleaning assembly includes a mounting base and a plunger pump.

[0009] In at least some embodiments, the heat spreader is fixedly installed on the outer end of the oil-immersed transformer casing. Two heat exchange plates are symmetrically arranged on the outer side of the heat spreader. Multiple heat pipes are sandwiched between the heat spreader and the two heat exchange plates. Two rows of staggered slots are opened at the outer end of the heat exchange plates. A drive shaft is fixedly inserted into the root of the heat dissipation fins. The heat dissipation fins are rotatably installed in the slots on the heat exchange plates through the drive shaft. Silicon grease is applied between the root of the heat dissipation fins and the heat exchange plates to improve thermal conductivity.

[0010] In at least some embodiments, a rotating wheel is fixedly installed on the top of the drive shaft, and symmetrically arranged insert rods are integrally formed on the rotating wheel. The connecting seat has two pairs and is respectively placed above and below the two heat exchange plates. The connecting seat has multiple sleeves corresponding to the rotating wheel. The sleeves are movably sleeved outside the rotating wheel and have two spiral grooves that slide and adapt to the insert rods. The sleeves move up and down, causing the heat dissipation fins to swing back and forth.

[0011] In at least some embodiments, a spiral seat is provided at the center of the slot on the top of the heat exchange plate, the drive shaft adopts a two-section insert design and a pressure plate is provided at the connection, the drive shaft is movably fitted with a screw cap that is adapted to the thread of the spiral seat, a rotating ring is provided between the screw cap and the pressure plate, and tightening the screw cap prevents the drive shaft from moving up and down without interfering with the rotation of the drive shaft.

[0012] In at least some embodiments, a driven gear is fixedly mounted concentrically on the back of the drive disk. The driven gear is rotatably mounted concentrically with the pressure measuring port on the oil-immersed transformer housing. A motor mount is fixedly mounted on one end of the oil-immersed transformer housing, and a motor is fixedly mounted on the motor mount. A driving gear that meshes with the driven gear is fixedly mounted on the output shaft of the motor. A slide block is fixedly mounted on the outer end of the drive disk. A slider is slidably mounted inside the slide block, and a first spring is fixedly mounted between the slider and the slide block. An I-beam is fixedly mounted on the drive frame. A horizontal sliding groove is provided on the I-beam, and a protrusion on the surface of the slider is provided to slide and adapt to the groove. The rotation of the drive disk drives the drive frame to reciprocate vertically through the I-beam.

[0013] In at least some embodiments, the output end of the hydraulic cylinder is rotatably mounted inside the pressure testing port of the oil-immersed transformer housing and a sealed bushing is installed between the hydraulic cylinder and the pressure testing port. The telescopic end of the hydraulic cylinder is fixedly connected to the slider. The oil temperature inside the oil-immersed transformer housing rises, driving the hydraulic cylinder to increase the swing amplitude of the heat dissipation fins.

[0014] In at least some embodiments, the mounting base is fixedly mounted on the housing of the oil-immersed transformer, the plunger pump is fixedly mounted on the mounting base, and piston rods are movably inserted into both the upper and lower parts of the plunger pump. One end of the piston rod passes through the mounting base and is fixedly connected to the drive frame. Two second springs are fixedly connected between the piston rod and the mounting base to stabilize the two drive frames. A piston for driving the plunger pump is fixedly mounted on the other end of the piston rod. The plunger pump is provided with a one-way air inlet and an air outlet, and the air outlet is fixedly connected to an air blowing pipe. When the two drive frames approach each other, the air outlet of the plunger pump pressurizes and blows air into the air blowing pipe. Multiple first extension pipes and second extension pipes are fixedly connected to the air blowing pipe.

[0015] In at least some embodiments, the first extension tube is positioned corresponding to the heat dissipation fins, and the first extension tube has a fan-shaped opening and is fitted with a dustproof mesh to cover the swing range of the heat dissipation fins.

[0016] In at least some embodiments, the second extension tube is disposed between two adjacent heat dissipation fins, and a rotating jet head is rotatably mounted at the end of the second extension tube. The rotating jet head is fixedly mounted with multiple elastic diaphragms in a ring array and has multiple tangential air holes spaced apart. The second extension tube is vented to drive the rotating jet head to rotate, so as to knock off the dust by striking the root of the heat dissipation fins through the elastic diaphragms.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0018] 1. The dynamic heat dissipation design improves efficiency. In this invention, the heat dissipation fins in the heat dissipation component are continuously oscillating by the driving component, which breaks the thermal boundary layer of the traditional static heat dissipation and improves the air convection heat transfer coefficient. This design has a higher temperature drop than the traditional static heat sink and does not require additional heat dissipation area.

[0019] 2. The invention adopts a temperature response design for heat dissipation. In this invention, the hydraulic cylinder in the drive component is linked with the temperature monitoring system. When the oil temperature exceeds the set threshold, the swing amplitude of the heat dissipation fins is automatically increased. This adaptive adjustment enables the transformer to keep the oil temperature within a safe range under overload conditions, avoiding the need for forced shutdown for heat dissipation in traditional transformers. Furthermore, the use of appropriate power for heat dissipation is more energy-efficient.

[0020] 3. The invention adopts a self-maintenance cleaning design and assists in heat dissipation. In this invention, the innovative rotating jet head design in the cleaning component, combined with mechanical vibration and airflow scouring, not only effectively solves the problem of dust accumulation on the heat sink, but also further assists in heat dissipation. The high-frequency knocking of the elastic vibrator generates a standing wave effect, which can shake off the micro-dust on the surface of the heat sink fins and blow it away by the airflow blown out by the first extension tube. Attached Figure Description

[0021] Figure 1This invention provides an overall three-dimensional schematic diagram of an oil-immersed transformer. Figure 1 ;

[0022] Figure 2 This invention provides an overall three-dimensional schematic diagram of an oil-immersed transformer. Figure 2 ;

[0023] Figure 3 This invention provides a schematic diagram of the structure of a heat dissipation component in an oil-immersed transformer;

[0024] Figure 4 This invention provides a schematic diagram of the connection between the drive frame and the drive assembly in an oil-immersed transformer;

[0025] Figure 5 This invention provides a schematic diagram of the structure of a drive assembly in an oil-immersed transformer;

[0026] Figure 6 This invention provides a schematic diagram of the structure of a heat dissipation component in an oil-immersed transformer;

[0027] Figure 7 The present invention provides a radial sectional view of the first extension tube in an oil-immersed transformer;

[0028] Figure 8 This invention provides a schematic diagram of the structure of the second extension tube in an oil-immersed transformer.

[0029] Legend: 1. Oil-immersed transformer casing; 101. Motor mount; 102. Spring rod sleeve;

[0030] 2. Drive frame;

[0031] 3. Heat dissipation components; 301. Heat spreader; 302. Heat dissipation fins; 303. Connector; 304. Heat pipe; 305. Drive shaft; 306. Rotary wheel; 307. Sleeve;

[0032] 4. Drive assembly; 401. Drive disc; 402. I-beam frame; 403. Hydraulic cylinder; 404. Driven gear; 405. Slide block; 406. Slider; 407. First spring; 408. Protruding post; 409. Sealing bushing;

[0033] 5. Cleaning components; 501. Mounting base; 502. Plunger pump; 503. Piston rod; 504. Second spring; 505. Air blowing pipe; 506. First extension pipe; 507. Second extension pipe; 508. Rotary jet head; 509. Elastic vibrator. Detailed Implementation

[0034] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0035] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0036] Example, according to Figures 1-8 An embodiment of the present invention provides an oil-immersed transformer including an oil-immersed transformer housing 1, such as... Figure 1 As shown, a pair of pressure testing ports are provided at one end of the casing 1 of the oil-immersed transformer for monitoring the internal oil temperature, such as... Figure 2 As shown, the outer periphery of the oil-immersed transformer housing 1 is provided with two drive frames 2 arranged in a vertically mirrored manner. A longitudinally arranged spring rod sleeve 102 is fixedly installed at the other end of the oil-immersed transformer housing 1. One side of the drive frame 2 is inserted into the spring rod sleeve 102 to maintain stability. It also includes two heat dissipation components 3 installed at the front and rear ends of the oil-immersed transformer housing 1 and driven to deform by the drive frames 2. The heat dissipation components 3 include a heat spreader 301, heat dissipation fins 302 and a connecting seat 303. A drive component 4 installed at one end of the oil-immersed transformer housing 1 drives the heat dissipation fins 302 to swing to improve the heat dissipation effect. The drive component 4 includes a drive disc 401, an I-beam frame 402 and a hydraulic cylinder 403. A cleaning component 5 is installed on the oil-immersed transformer housing 1. The cleaning component 5 has two pairs and is symmetrically arranged at the front and rear ends of the oil-immersed transformer housing 1 to perform self-cleaning on the heat dissipation fins 302. The cleaning component 5 includes a mounting seat 501 and a plunger pump 502.

[0037] like Figure 3 As shown, a heat spreader 301 is fixedly installed on the outer end of the oil-immersed transformer casing 1. Two heat exchange plates are symmetrically arranged on the outer side of the heat spreader 301. Multiple heat pipes 304 are sandwiched between the heat spreader 301 and the two heat exchange plates. Two rows of staggered slots are opened on the outer end of the heat exchange plates. A drive shaft 305 is fixedly inserted into the root of the heat dissipation fins 302. The heat dissipation fins 302 are rotatably installed in the slots on the heat exchange plates through the drive shaft 305. The root of the heat dissipation fins 302 and the heat exchange plates are coated with a coating. Silicone grease is used to improve thermal conductivity. A rotating wheel 306 is fixedly installed on the top of the drive shaft 305, and symmetrically arranged insert rods are integrally formed on the rotating wheel 306. The connecting seat 303 has two pairs and is placed above and below the two heat exchange plates respectively. The connecting seat 303 has multiple sleeves 307 corresponding to the rotating wheel 306. The sleeves 307 are movably sleeved on the rotating wheel 306, and two spiral grooves are opened on the sleeves 307 to slide and adapt to the insert rods. The sleeves 307 move up and down, causing the heat dissipation fins 302 to swing back and forth.

[0038] The heat exchange plate 301 is tightly connected to the heat exchange plates on both sides through the heat pipe 304, which efficiently conducts the heat inside the transformer to the outside. The heat dissipation fins 302 are installed in the slots of the heat exchange plates through the drive shaft 305. The base of the fins is coated with high thermal conductivity silicone grease between the heat exchange plates to ensure that the heat is quickly transferred to the heat dissipation fins 302. When the drive frame 2 moves up and down, the connecting seat 303 drives the sleeve 307 to move along the spiral groove of the rotating wheel 306, so that the heat dissipation fins 302 swing back and forth around the drive shaft 305 (the swing angle is 15° to 30°, which can be adjusted according to the heat dissipation requirements). This dynamic swing generates a forced convection effect, which improves the heat dissipation efficiency compared with traditional static heat dissipation.

[0039] A spiral seat is provided at the top of the heat exchange plate, corresponding to the slot position and centered. The drive shaft 305 adopts a two-section insert design with a pressure plate at the connection. The drive shaft 305 is movably fitted with a cap that matches the thread of the spiral seat. A rotating ring is provided between the cap and the pressure plate. Tightening the cap prevents the drive shaft 305 from moving up and down without interfering with the rotation of the drive shaft 305. The drive shaft 305 adopts a split design. During installation, the heat dissipation fins 302 are first inserted into the slot, and then the upper shaft section with the rotating wheel 306 is inserted into the lower shaft section. The cap is tightened by applying torque. This design shortens the replacement time of a single heat dissipation fin 302 compared to the traditional welding type. The threaded fit between the spiral seat and the cap can precisely control the clamping force, ensuring that the drive shaft 305 does not move axially and that its rotational resistance is small.

[0040] like Figure 4 and Figure 5 As shown, a driven gear 404 is fixedly mounted concentrically on the back of the drive disk 401. The driven gear 404 is rotatably mounted concentrically with the pressure measuring port on the oil-immersed transformer housing 1. A motor base 101 is fixedly mounted on one end of the oil-immersed transformer housing 1, and a motor is fixedly mounted on the motor base 101. A drive gear that meshes with the driven gear 404 is fixedly mounted on the output shaft of the motor. A slide block 405 is fixedly mounted on the outer end of the drive disk 401. A slider 406 is slidably mounted inside the slide block 405, and a first spring 407 is fixedly mounted between the slider 406 and the slide block 405. The frame 402 is fixedly installed on the drive frame 2. The I-beam frame 402 has a horizontal sliding groove and the surface of the slider 406 has a protrusion 408 that is adapted to slide in the sliding groove. The drive disc 401 rotates and drives the drive frame 2 to move vertically and reciprocally through the I-beam frame 402. The output end of the hydraulic cylinder 403 is rotatably installed in the pressure measuring port of the oil-immersed transformer shell 1 and a sealing bushing 409 is installed between it and the pressure measuring port. The telescopic end of the hydraulic cylinder 403 is fixedly connected to the slider 406. The oil temperature inside the oil-immersed transformer shell 1 rises and drives the hydraulic cylinder 403 to increase the swing amplitude of the heat dissipation fins 302.

[0041] Among them, the drive component 4 adopts a temperature feedback control mechanism. When the oil temperature exceeds the preset temperature (achieved by replacing the first spring 407 with different elasticity), the temperature sensing medium in the hydraulic cylinder 403 expands, pushing the slider 406 to move outward, increasing the preload of the first spring 407. At this time, when the motor drives the drive disk 401 to rotate, the stroke of the protrusion 408 of the slider 406 in the slide groove of the I-beam frame 402 is expanded, resulting in an increase in the vertical displacement amplitude of the drive frame 2. This design increases the swing amplitude of the heat dissipation fins 302, and by increasing the motor power to increase or decrease the swing frequency, the positive correlation between heat dissipation power and temperature is achieved.

[0042] like Figure 6 As shown, mounting base 501 is fixedly mounted on the outer shell 1 of the oil-immersed transformer, and plunger pump 502 is fixedly mounted on mounting base 501. Piston rods 503 are movably inserted into both the upper and lower parts of plunger pump 502. One end of the piston rod 503 passes through mounting base 501 and is fixedly connected to drive frame 2. Two second springs 504 are fixedly connected between piston rod 503 and mounting base 501 to stabilize the two drive frames 2. The other end of piston rod 503 is fixedly mounted with a piston that drives plunger pump 502. Plunger pump 502 has a one-way air inlet and an air outlet, and the air outlet is fixedly connected to an air blowing pipe 505. When the two drive frames 2 approach each other, the air outlet of plunger pump 502 pressurizes and blows air into air blowing pipe 505. Multiple first extension pipes 506 and second extension pipes 507 are fixedly connected to air blowing pipe 505. Figure 7 As shown, the first extension tube 506 is positioned corresponding to the heat dissipation fin 302. The first extension tube 506 has a fan-shaped opening and is fitted with a dust filter to cover the swing range of the heat dissipation fin 302. Figure 8 As shown, the second extension tube 507 is disposed between two adjacent heat dissipation fins 302. A rotating jet head 508 is rotatably mounted on the end of the second extension tube 507. Multiple elastic vibrating plates 509 are fixedly mounted on the rotating jet head 508 in a ring array and multiple tangential air holes are spaced apart. The second extension tube 507 vents air to drive the rotating jet head 508 to rotate, so that the dust is shaken off by striking the root of the heat dissipation fin 302 through the elastic vibrating plates 509.

[0043] Among them, the cleaning component 5 works in conjunction with the heat dissipation movement. When the distance between the drive frame 2 changes, the piston rod 503 drives the plunger pump 502 to generate compressed air. The airflow is divided into two paths through the air blowing pipe 505: the fan-shaped airflow of the first extension pipe 506 covers the surface of the heat dissipation fins 302. While blowing away the floating dust, the airflow further improves the heat dissipation effect. The second extension pipe 507 drives the rotating jet head 508 to rotate. Its elastic vibrating plate 509 strikes the root of the heat dissipation fins 302 at a frequency of 50Hz, generating mechanical vibration to peel off the stubborn dust.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An oil-immersed transformer, comprising an oil-immersed transformer casing (1), characterized in that: The oil-immersed transformer casing (1) has a pair of pressure testing ports at one end for monitoring the internal oil temperature. Two drive frames (2) are arranged in a vertically mirrored configuration around the outer periphery of the oil-immersed transformer casing (1). A longitudinally arranged spring rod sleeve (102) is fixedly installed at the other end of the oil-immersed transformer casing (1). One side of the drive frame (2) is inserted into the spring rod sleeve (102) to maintain stability. The transformer also includes: Two heat dissipation components (3) are installed at the front and rear ends of the oil-immersed transformer housing (1) and are driven to deform by the drive frame (2). The heat dissipation components (3) include a heat dissipation plate (301), heat dissipation fins (302) and a connecting seat (303). The drive assembly (4) installed on one side of the oil-immersed transformer housing (1) drives the heat dissipation fins (302) to swing to improve the heat dissipation effect. The drive assembly (4) includes a drive disk (401), an I-beam frame (402) and a hydraulic cylinder (403). The cleaning assembly (5) is installed on the oil-immersed transformer housing (1). The cleaning assembly (5) has two pairs and is symmetrically arranged at the front and rear ends of the oil-immersed transformer housing (1) to perform self-cleaning on the heat dissipation fins (302). The cleaning assembly (5) includes a mounting base (501) and a plunger pump (502).

2. The oil-immersed transformer according to claim 1, characterized in that: The heat exchange plate (301) is fixedly installed on the outer end of the oil-immersed transformer shell (1). Two heat exchange plates are symmetrically arranged on the outer side of the heat exchange plate (301). Multiple heat pipes (304) are sandwiched between the heat exchange plate (301) and the two heat exchange plates. Two rows of staggered slots are opened on the outer end of the heat exchange plate. A drive shaft (305) is fixedly inserted into the root of the heat dissipation fin (302). The heat dissipation fin (302) is rotatably installed in the slot on the heat exchange plate through the drive shaft (305). Silicon grease is coated between the root of the heat dissipation fin (302) and the heat exchange plate to improve thermal conductivity.

3. An oil-immersed transformer according to claim 2, characterized in that: The drive shaft (305) is fixedly mounted with a rotating wheel (306) and the rotating wheel (306) has symmetrically arranged insert rods integrally formed on it. The connecting seat (303) has two pairs and is respectively placed above and below the two heat exchange plates. The connecting seat (303) has multiple sleeves (307) corresponding to the rotating wheel (306). The sleeves (307) are movably sleeved outside the rotating wheel (306) and the sleeves (307) have two spiral grooves that are adapted to slide with the insert rods. The sleeves (307) move up and down, causing the heat dissipation fins (302) to swing back and forth.

4. An oil-immersed transformer according to claim 3, characterized in that: The heat exchange plate has a spiral seat at the center of the corresponding slot on the top. The drive shaft (305) adopts a two-section insert design and a pressure plate is provided at the connection. The drive shaft (305) is movably fitted with a screw cap that is compatible with the thread of the spiral seat. A rotating ring is provided between the screw cap and the pressure plate. Tightening the screw cap prevents the drive shaft (305) from moving up and down and does not interfere with the rotation of the drive shaft (305).

5. An oil-immersed transformer according to claim 1, characterized in that: A driven gear (404) is fixedly mounted concentrically on the back of the drive disk (401). The driven gear (404) is rotatably mounted concentrically with the pressure measuring port on the oil-immersed transformer housing (1). A motor mount (101) is fixedly mounted on one end of the oil-immersed transformer housing (1), and a motor is fixedly mounted on the motor mount (101). A drive gear that meshes with the driven gear (404) is fixedly mounted on the output shaft of the motor. A slide is fixedly mounted on the outer end of the drive disk (401). 405), a slider (406) is slidably installed in the slide (405) and a first spring (407) is fixedly installed between the slider (406) and the slide (405). The I-beam frame (402) is fixedly installed on the drive frame (2). The I-beam frame (402) has a horizontal sliding groove and the surface of the slider (406) has a protrusion (408) that is adapted to slide in the sliding groove. The drive disk (401) rotates and drives the drive frame (2) to move vertically back and forth through the I-beam frame (402).

6. An oil-immersed transformer according to claim 5, characterized in that: The output end of the hydraulic cylinder (403) is rotatably installed in the pressure measuring port of the oil-immersed transformer housing (1) and a sealing bushing (409) is installed between the hydraulic cylinder (403) and the pressure measuring port. The telescopic end of the hydraulic cylinder (403) is fixedly connected to the slider (406). The oil temperature inside the oil-immersed transformer housing (1) rises, driving the hydraulic cylinder (403) to increase the swing amplitude of the heat dissipation fins (302).

7. An oil-immersed transformer according to claim 1, characterized in that: The mounting base (501) is fixedly mounted on the outer shell (1) of the oil-immersed transformer. The plunger pump (502) is fixedly mounted on the mounting base (501). Piston rods (503) are movably inserted into both the upper and lower parts of the plunger pump (502). One end of the piston rod (503) passes through the mounting base (501) and is fixedly connected to the drive frame (2). Two second springs (504) are fixedly connected between the piston rod (503) and the mounting base (501) to stabilize the two piston rods. The piston rod (503) of the drive frame (2) is fixedly mounted with a piston for driving the plunger pump (502). The plunger pump (502) is provided with a one-way air inlet and an air outlet, and the air outlet is fixedly connected to an air blowing pipe (505). When the two drive frames (2) approach each other, the air outlet of the plunger pump (502) pressurizes the air blowing pipe (505) and blows air. The air blowing pipe (505) is fixedly connected to multiple first extension pipes (506) and second extension pipes (507).

8. An oil-immersed transformer according to claim 7, characterized in that: The first extension tube (506) is positioned corresponding to the heat dissipation fin (302). The first extension tube (506) has a fan-shaped opening and is equipped with a dustproof net to cover the swing range of the heat dissipation fin (302).

9. An oil-immersed transformer according to claim 8, characterized in that: The second extension tube (507) is disposed between two adjacent heat dissipation fins (302). A rotating jet head (508) is rotatably mounted at the end of the second extension tube (507). Multiple elastic vibrating plates (509) are fixedly mounted on the rotating jet head (508) in a ring array and multiple tangential air holes are spaced apart. The second extension tube (507) vents air to drive the rotating jet head (508) to rotate, so that the dust is shaken off by the elastic vibrating plates (509) striking the root of the heat dissipation fins (302).

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