Oil immersed power transformer

Abstract

The present invention discloses an oil-immersed power transformer, comprising an oil tank, a radiator arranged on the sides of the oil tank, a high-voltage bushing arranged at one end of the top of the oil tank, a low-voltage bushing arranged at the other end of the top of the oil tank, and a transformer body arranged in the inner cavity of the oil tank; an oil drain port is arranged on one side of the lower end of the oil tank, a control valve is arranged on the oil drain port, the transformer body is fixed to the inner cavity of the oil tank by a support frame, and the bottom of the transformer body and the bottom of the inner cavity of the oil tank form a cleaning space, the oil drain port corresponds to one end of the cleaning space, and the cleaning space is provided with a cleaning mechanism for cleaning sediment. The oil-immersed power transformer is driven to rise and fall by a driving mechanism through a first scraper, and then the first scraper can clean the side wall of the lower end of the inner cavity of the oil tank. When the first scraper rises to a certain extent, the longitudinal side wall cleaning mechanism explodes to clean the top of the first scraper, solving the problem of difficult cleaning.

Description

Technical Field

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

[0002] The oil-immersed transformer is a new type of high-performance transformer with a more reasonable structure and better performance. Its three-dimensional wound core has three core columns arranged in an equilateral triangle, with no air gap in the magnetic circuit, tighter winding, and the three magnetic circuits are of the same length and the shortest. The cross-sectional area of ​​the core column is closer to a circle, so the performance is further improved, the loss is reduced, the noise is reduced, the three items are balanced, and the third harmonic component is reduced. This product is more suitable for urban and rural, industrial and mining enterprise power grid transformation, and is more suitable for combined transformers and prefabricated substation transformers.

[0003] The oil-immersed transformer is mainly composed of an iron core, windings, an oil tank, an oil pillow, an insulating sleeve, a tap changer and a gas relay. The iron core and windings are all immersed in transformer oil, which plays an insulating and cooling role. Transformer oil will undergo thermal decomposition reaction under long-term high temperature environment, and then produce sediment, which makes the oil turbid, affects the activity, and then affects normal use. Therefore, the transformer oil needs to be discharged and replaced regularly. However, in the prior art, when replacing, the valve on the discharge port is only opened to drain the oil. The sediment adhered to the bottom wall of the inner cavity of the oil tank and the side wall of the lower end cannot be effectively discharged. Over time, it accumulates thicker and thicker, thereby reducing the service life of the transformer.

[0004] Therefore, it is necessary to propose an oil-immersed power transformer to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide an oil-immersed power transformer, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] An oil-immersed power transformer comprises an oil tank, a radiator arranged on the sides of the oil tank, a high-voltage bushing arranged at one end of the top of the oil tank, a low-voltage bushing arranged at the other end of the top of the oil tank, and a transformer body arranged in the inner cavity of the oil tank;

[0008] An oil drain port is provided on one side of the lower end of the oil tank, and a control valve is provided on the oil drain port. The transformer body is fixed to the inner cavity of the oil tank by a support frame, and the bottom of the transformer body and the bottom of the inner cavity of the oil tank form a cleaning space. The oil drain port corresponds to one end of the cleaning space. The cleaning space is provided with a cleaning mechanism for cleaning sediment, and the cleaning mechanism includes a longitudinal side wall cleaning mechanism and a transverse bottom wall cleaning mechanism.

[0009] The longitudinal side wall cleaning mechanism comprises a first scraper movably connected to the cleaning space, and a driving mechanism for driving the first scraper to rise and fall is provided at the bottom of the first scraper;

[0010] The transverse bottom wall cleaning mechanism is arranged above the first scraper and is linked with the longitudinal side wall cleaning mechanism.

[0011] Preferably, the transverse bottom wall cleaning mechanism includes guide straight grooves symmetrically arranged on both sides of the upper end of the cleaning space, guide blocks are symmetrically and movably connected to the inner sides of the two guide straight grooves, a displacement cross plate is arranged between the two guide blocks, a second scraper is fixedly connected to the bottom of the displacement cross plate, a first spring is fixedly connected between the side of the guide block away from the oil discharge port and the side of the inner cavity of the guide straight groove away from the oil discharge port, grooves corresponding to the guide blocks are symmetrically arranged at both ends of the displacement cross plate, the close ends of the two guide blocks extend to the inner sides of the two grooves respectively, a column is vertically arranged in the inner cavity of the groove, a through hole is arranged at one end of the guide block located in the groove, and the guide block is movably sleeved on the outer side of the upper end of the column through the through hole, and a second spring is sleeved on the outer side of the lower end of the column.

[0012] Preferably, the longitudinal section of the second scraper is an isosceles triangle, and the left and right sides are inclined surfaces.

[0013] Preferably, a pushing mechanism is provided on the top of the first scraper, which cooperates with the inclined surface of the second scraper and is linked with the lifting and lowering of the first scraper;

[0014] The pushing mechanism includes a moving seat movably connected to the top of the first scraper, a pushing block is arranged at one end of the top of the moving seat, a rotating wheel is rotatably connected to one side of the moving seat, and guide inclined grooves corresponding to and adapted to the rotating wheel are symmetrically arranged on the front and rear sides of the lower end of the inner cavity of the cleaning space, the guide inclined grooves are inclined, and the end of the guide inclined groove close to the oil discharge port is the bottom point, and the end away from the oil discharge port is the high point, and the two rotating wheels are movably connected to the inner sides of the two guide inclined grooves respectively.

[0015] Preferably, the longitudinal section of the push block is an isosceles triangle, and the left and right sides are inclined surfaces, and the side surface of the push block matches the inclined surface of the side surface of the second scraper.

[0016] Preferably, the pushing mechanism is arranged at the front and rear ends of the top of the first scraper; guide rails corresponding to the pushing mechanism are symmetrically arranged at the two ends of the top of the first scraper, and a notch adapted to the guide rail is arranged on the movable seat, and the movable seat is movably connected to the guide rail through the notch.

[0017] Preferably, notches corresponding to and fitting the guide rails are provided at both ends of the bottom of the second scraper.

[0018] Preferably, the displacement transverse plate and the second scraper have the same length, and the front and rear sides of the displacement transverse plate and the second scraper are both fitted and slidably connected to the front and rear sides of the inner cavity of the cleaning space;

[0019] The side walls around the first scraper are fitted with and slidably connected to the inner wall of the cleaning space.

[0020] Preferably, the driving mechanism includes a bidirectional screw rotatably connected to the lower end of the inner cavity of the cleaning space through a sealed bearing, one end of the bidirectional screw extends to the outside of the oil tank and is provided with a driving part for driving the bidirectional screw to rotate, the driving part is a knob or a handwheel, and the outer sides of both ends of the bidirectional screw are symmetrically threaded with moving blocks, and the two ends of the bottom of the first scraper are symmetrically provided with supports corresponding to the moving blocks, and a connecting rod is movably connected between the support and the moving block through a pin shaft.

[0021] Preferably, a pressure mechanism for pressurizing the interior of the oil tank is provided on one side of the oil tank, and the pressure mechanism includes an air pump arranged on the side of the oil tank close to the driving part, and a third spring for resetting the air pump is provided inside the air pump, and arc-shaped protrusions are evenly provided on the outer side of the driving part, and the lower end of the air pump corresponds to and abuts against the driving part, and the air outlet of the air pump is connected to the interior of the oil tank.

[0022] Beneficial Effects

[0023] Compared with the prior art, the present invention provides an oil-immersed power transformer, which has the following beneficial effects:

[0024] 1. The oil-immersed power transformer is fixed to the inner cavity of the oil tank by a supporting frame through a transformer body provided, and there is a gap between the transformer body and the bottom of the inner cavity of the oil tank, the gap can be convenient for temporary storage of sediments, and the gap is also used as a space for cleaning sediments, which is convenient for subsequent cleaning; the first scraper is driven to rise and fall by a driving mechanism, so that the first scraper can clean the side wall of the lower end of the inner cavity of the oil tank, and the horizontal bottom wall cleaning mechanism provided above the first scraper cooperates with the lifting and lowering of the first scraper through a pushing mechanism, so that when the first scraper rises, the horizontal bottom wall cleaning mechanism can accumulate power, and when the first scraper rises to a certain extent, the horizontal bottom wall cleaning mechanism explodes to clean the top of the first scraper, so that the bottom wall and side wall of the lower end of the inner cavity of the oil tank can be cleaned when the oil is replaced and drained, which solves the problem of difficult cleaning, prevents the accumulation and thickening of sediments from affecting use, increases practicality, and improves efficiency.

[0025] 2. The oil-immersed power transformer can exert pressure on the inside of the oil tank 1 when draining oil through the pressure-applying mechanism, which can increase the efficiency of draining oil and sediment, so that the transformer oil can be drained faster, and the cleaning linkage setting increases practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0028] Figure 3 The present invention Figure 2 The structural schematic diagram of the guide inclined groove and the guide straight groove is embossed on the foundation;

[0029] Figure 4 It is a schematic diagram of the structure of the cleaning mechanism of the present invention in the initial state;

[0030] Figure 5 The present invention Figure 4 A schematic diagram of the structure of the display drive mechanism is embossed on the base;

[0031] Figure 6 It is a structural schematic diagram of the cleaning mechanism of the present invention in the early working state;

[0032] Figure 7 It is a schematic diagram of the structure of the first scraper of the present invention when it is displaced to a state where it is about to reach a limit distance;

[0033] Figure 8 It is a schematic diagram of the structure of the displacement horizontal plate during the resetting process of the present invention;

[0034] Fig. 9 It is a schematic diagram of the structure of the present invention when the displacement cross plate and the guide block are separated;

[0035] Fig.10 It is a schematic diagram of the structure of the push mechanism of the present invention in a disassembled state;

[0036] Fig.11 It is a schematic diagram of the cross-sectional structure of the air pump of the present invention.

[0037] In the figure: 1. oil tank; 2. radiator; 3. high-voltage bushing; 4. low-voltage bushing; 5. support frame; 6. transformer body; 7. drive unit; 8. oil drain port; 9. control valve; 10. first scraper; 11. displacement cross plate; 12. bidirectional screw; 13. guide inclined groove; 14. guide straight groove; 15. guide rail; 16. moving seat; 17. rotating wheel; 18. second scraper; 19. guide block; 20. first spring; 21. push block; 22. support; 23. moving block; 24. connecting rod; 25. notch; 26. groove; 27. column; 28. second spring; 29. ​​through hole; 30. slide groove; 31. air pump; 32. third spring. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0039] Example

[0040] like Figure 1-Figure 11 As shown, in this embodiment, the oil-immersed power transformer includes an oil tank 1, a radiator 2 arranged on the sides of the oil tank 1, a high-voltage bushing 3 arranged at one end of the top of the oil tank 1, a low-voltage bushing 4 arranged at the other end of the top of the oil tank 1, and a transformer body 6 arranged in the inner cavity of the oil tank 1;

[0041] Furthermore, an oil drain port 8 is provided on one side of the lower end of the oil tank 1, and a control valve 9 is provided on the oil drain port 8. The transformer body 6 is fixed to the inner cavity of the oil tank 1 by the support frame 5, and the bottom of the transformer body 6 and the bottom of the inner cavity of the oil tank 1 form a cleaning space, and the oil drain port 8 corresponds to one end of the cleaning space;

[0042] Furthermore, the cleaning space is provided with a cleaning mechanism for cleaning sediment, and the cleaning mechanism includes a longitudinal side wall cleaning mechanism and a transverse bottom wall cleaning mechanism;

[0043] As a preferred embodiment, the longitudinal side wall cleaning mechanism includes a first scraper 10 movably connected to the cleaning space, the side walls of the first scraper 10 are in contact with and slidably connected to the inner wall of the cleaning space, and a driving mechanism for driving the first scraper 10 to rise and fall is provided at the bottom of the first scraper 10;

[0044] Further, as a preferred embodiment, the driving mechanism includes a bidirectional screw 12 rotatably connected to the lower end of the inner cavity of the cleaning space through a sealed bearing, one end of the bidirectional screw 12 extends to the outside of the oil tank 1 and is provided with a driving part 7 for driving the bidirectional screw 12 to rotate, the driving part 7 is a knob or a handwheel, so it can be manually controlled or electrically controlled according to needs, the outer sides of both ends of the bidirectional screw 12 are symmetrically threaded with moving blocks 23, and the two ends of the bottom of the first scraper 10 are symmetrically provided with supports 22 corresponding to the moving blocks 23, and a connecting rod 24 is movably connected between the support 22 and the moving block 23 through a pin shaft.

[0045] As a preferred embodiment, the horizontal bottom wall cleaning mechanism includes a guide straight groove 14 symmetrically arranged on both sides of the upper end of the cleaning space, and the inner sides of the two guide straight grooves 14 are symmetrically and movably connected with guide blocks 19, and a displacement horizontal plate 11 is arranged between the two guide blocks 19. The bottom of the displacement horizontal plate 11 is fixedly connected with a second scraper 18. The displacement horizontal plate 11 and the second scraper 18 have the same length, and the front and rear sides of the displacement horizontal plate 11 and the second scraper 18 are both fitted and slidably connected with the front and rear sides of the inner cavity of the cleaning space. The longitudinal section of the second scraper 18 is an isosceles triangle, and the left and right sides are inclined surfaces. A first spring 20 is fixedly connected between the side of the guide block 19 away from the oil discharge port 8 and the side of the inner cavity of the guide straight groove 14 away from the oil discharge port 8. Grooves 26 corresponding to the guide blocks 19 are symmetrically arranged at both ends of the displacement cross plate 11. The ends of the two guide blocks 19 that are close to each other extend to the inner sides of the two grooves 26 respectively. A column 27 is vertically arranged in the inner cavity of the groove 26. A through hole 29 is arranged at one end of the guide block 19 located in the groove 26, and the guide block 19 is movably sleeved on the outer side of the upper end of the column 27 through the through hole 29. A second spring 28 is sleeved on the outer side of the lower end of the column 27.

[0046] Furthermore, a pushing mechanism is provided on the top of the first scraper 10, which cooperates with the inclined surface of the second scraper 18 and is linked with the lifting and lowering of the first scraper 10;

[0047] As a preferred embodiment, the pushing mechanism is arranged at the front and rear ends of the top of the first scraper 10, and the pushing mechanism includes a moving seat 16 movably connected to the top of the first scraper 10, and a pushing block 21 is arranged at one end of the top of the moving seat 16. The longitudinal section of the pushing block 21 is an isosceles triangle, and the left and right sides are inclined surfaces. The side of the pushing block 21 cooperates with the inclined surface of the side of the second scraper 18. A rotating wheel 17 is rotatably connected to one side of the moving seat 16, and guide inclined grooves 13 corresponding to and adapted to the rotating wheel 17 are symmetrically arranged on the front and rear sides of the lower end of the inner cavity of the cleaning space. The guide inclined grooves 13 are inclined, and the end of the guide inclined groove 13 close to the oil discharge port 8 is the bottom point, and the end away from the oil discharge port 8 is the high point. The two rotating wheels 17 are movably connected to the inner sides of the two guide inclined grooves 13 respectively.

[0048] Furthermore, in order to increase stability, guide rails 15 corresponding to the pushing mechanism are symmetrically arranged at both ends of the top of the first scraper 10 , and a notch 25 adapted to the guide rail 15 is arranged on the movable seat 16 , and the movable seat 16 is movably connected to the guide rail 15 through the notch 25 .

[0049] In order to adapt to the guide rail 15, notches 25 corresponding to and adapted to the guide rail 15 are provided at both ends of the bottom of the second scraper 18;

[0050] Furthermore, in order to increase the efficiency during oil discharge, a pressure-applying mechanism for pressurizing the interior of the oil tank 1 is provided on one side of the oil tank 1, and the pressure-applying mechanism includes an air pump 31 provided on the side of the oil tank 1 close to the driving part 7. The air pump 31 is located in the gap of the radiator 2, and the air pump 31 is vertically arranged. The air pump 31 is a prior art, and is composed of a piston rod, a cylinder body, an air outlet, a piston, etc. The prior art will not be described in detail. A third spring 32 for resetting the piston rod of the air pump 31 is provided inside the air pump 31, and arc-shaped protrusions are evenly provided on the outside of the driving part 7. The lower end of the piston rod of the air pump 31 corresponds to the driving part 7 and is in contact with the arc-shaped protrusion on the driving part 7, and the air outlet of the air pump 31 is connected to the interior of the oil tank 1.

[0051] Working principle: when in use, the transformer body 6 is fixed to the inner cavity of the oil tank 1 by the support frame 5. A gap is left at the bottom of the transformer body 6, which is a space for cleaning sediment. The sediment generated by the transformer oil after long-term use can fall into the cleaning space below the transformer body 6. When the transformer oil needs to be replaced, the control valve 9 can be opened, and the oil is discharged through the oil drain port 8. Initially, the displacement cross plate 11 and the push block 21 are both located at one end of the cleaning space close to the oil drain port 8, and the upper end of the push block 21 corresponds to the lower end of the second scraper 18, and at this time the first spring 20 is in a reset state, the second spring 28 is in a reset state, the guide block 19 is located at one end of the guide straight groove 14 close to the oil drain port 8, and the runner 17 is located at one end of the guide inclined groove 13 close to the oil drain port 8, and then The bidirectional screw 12 is controlled to rotate by the driving unit 7, and the bidirectional screw 12 drives the two moving blocks 23 to move closer or farther away from each other. The displacement of the moving block 23 can drive the inclination angle of the connecting rod 24 to change, and then the first scraper 10 is propped up by the connecting rod 24. The first scraper 10 rises to scrape the sediment on the side wall of the cleaning space. When the first scraper 10 rises, the rotating wheel 17 drives the moving seat 16 and the pushing block 21 as a whole to move away from the oil discharge port 8 under the action of the guiding inclined groove 13, and then the pushing block 21 contacts the second scraper 18 and pushes the second scraper 18 and the displacement cross plate 11 as a whole to move away from the oil discharge port 8, and then one end of the guide block 19 slides in the guiding straight groove 14, and the first spring 20 is compressed. The two scrapers 18 are matched with the inclined surfaces, so as the push block 21 moves, the second scraper 18 and the displacement cross plate 11 will move upward as a whole under the action of the push block 21. Since the height of the guide block 19 remains unchanged, the second spring 28 is compressed. Although the push block 21 and the second scraper 18 are matched with the inclined surfaces, the lateral displacement of the push block 21 will also be longitudinally displaced. Therefore, when the push block 21 pushes the second scraper 18 to move the front distance, the second scraper 18 will not separate from the push block 21. As the first scraper 10 rises, the push block 21 pushes the second scraper 18 and the displacement cross plate 11. When the overall displacement distance is about to reach the limit distance, the first spring 20 is difficult to contract. Subsequently, the displacement cross plate 11 and the second scraper 18 move upward at a speed greater than the speed of the push block 21 moving upward The second scraper 18 is moved downwards and the push block 21 is moved upwards, and the second scraper 18 is moved downwards and the push block 21 is moved upwards.When the push block 21 reaches the second scraper 18, it will be matched with the other side of the second scraper 18 at an inclined surface. At this time, the second scraper 18 and the displacement cross plate 11 are displaced upward again, and the second spring 28 is compressed until the push block 21 is separated from the second scraper 18 and reaches the side of the second scraper 18 close to the oil discharge port 8. Finally, the second spring 28 is reset, and the displacement cross plate 11 and the second scraper 18 fall down as a whole to wait for the next cleaning. The device first cleans the side wall, and automatically cleans the bottom wall after the side wall cleaning is completed, which is convenient for the discharge of sediment, has a simple and compact structure, and improves efficiency.

[0052] In addition, when the driving part 7 is rotated, the arc-shaped protrusion on the driving part 7 will continuously cooperate with the bottom of the piston rod of the air pump 31, so that when the driving part 7 rotates, the reset effect of the third spring 32 can continuously realize the up and down displacement of the piston rod of the air pump 31. Because the air outlet of the air pump 31 is connected to the interior of the oil tank 1, the internal pressure of the oil tank 1 can be applied when the driving part 7 is rotated, and the efficiency of draining oil and sediment can be increased when draining oil, so that the transformer oil can be drained faster, and the linkage setting with the cleaning increases practicality.

[0053] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. 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, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An oil-immersed power transformer, comprising an oil tank (1), a radiator (2) arranged on the sides of the oil tank (1), a high-voltage bushing (3) arranged at one end of the top of the oil tank (1), a low-voltage bushing (4) arranged at the other end of the top of the oil tank (1), and a transformer body (6) arranged in the inner cavity of the oil tank (1); Features: An oil drain port (8) is provided on one side of the lower end of the oil tank (1), and a control valve (9) is provided on the oil drain port (8); the transformer body (6) is fixed to the inner cavity of the oil tank (1) by a support frame (5), and a cleaning space is formed between the bottom of the transformer body (6) and the bottom of the inner cavity of the oil tank (1); the oil drain port (8) corresponds to one end of the cleaning space; a cleaning mechanism for cleaning sediment is provided in the cleaning space, and the cleaning mechanism comprises a longitudinal side wall cleaning mechanism and a transverse bottom wall cleaning mechanism; The longitudinal side wall cleaning mechanism comprises a first scraper (10) movably connected to the cleaning space, and a driving mechanism for driving the first scraper (10) to move up and down is provided at the bottom of the first scraper (10); The transverse bottom wall cleaning mechanism is arranged above the first scraper (10) and is linked with the longitudinal side wall cleaning mechanism; The transverse bottom wall cleaning mechanism comprises guide straight grooves (14) symmetrically arranged on both sides of the upper end of the cleaning space, guide blocks (19) are symmetrically and movably connected to the inner sides of the two guide straight grooves (14), a displacement transverse plate (11) is arranged between the two guide blocks (19), a second scraper (18) is fixedly connected to the bottom of the displacement transverse plate (11), a first spring (20) is fixedly connected between a side of the guide block (19) away from the oil discharge port (8) and a side of the inner cavity of the guide straight groove (14) away from the oil discharge port (8), and the Grooves (26) corresponding to the guide blocks (19) are symmetrically arranged at both ends of the displacement cross plate (11), and the adjacent ends of the two guide blocks (19) extend to the inner sides of the two grooves (26), respectively. A column (27) is vertically arranged in the inner cavity of the groove (26), and a through hole (29) is arranged at one end of the guide block (19) located in the groove (26), and the guide block (19) is movably sleeved on the outer side of the upper end of the column (27) through the through hole (29), and a second spring (28) is sleeved on the outer side of the lower end of the column (27); A pushing mechanism is provided at the top of the first scraper (10), which cooperates with the inclined surface of the second scraper (18) and is linked to the lifting and lowering of the first scraper (10); The pushing mechanism comprises a movable seat (16) movably connected to the top of the first scraper (10), a pushing block (21) is arranged at one end of the top of the movable seat (16), a rotating wheel (17) is rotatably connected to one side of the movable seat (16), and guide inclined grooves (13) corresponding to and adapted to the rotating wheel (17) are symmetrically arranged on the front and rear sides of the lower end of the inner cavity of the cleaning space, the guide inclined grooves (13) are arranged in an inclined manner, and the end of the guide inclined groove (13) close to the oil discharge port (8) is the bottom point, and the end away from the oil discharge port (8) is the high point, and the two rotating wheels (17) are respectively movably connected to the inner sides of the two guide inclined grooves (13); The pushing mechanism is arranged at the front and rear ends of the top of the first scraper (10); guide rails (15) corresponding to the pushing mechanism are symmetrically arranged at the two ends of the top of the first scraper (10); a notch (25) adapted to the guide rail (15) is arranged on the movable seat (16); and the movable seat (16) is movably connected to the guide rail (15) via the notch (25).

2. The oil-immersed power transformer according to claim 1, characterized in that: The longitudinal section of the second scraper (18) is an isosceles triangle, and the left and right sides are inclined surfaces.

3. The oil-immersed power transformer according to claim 2, characterized in that: The longitudinal section of the push block (21) is an isosceles triangle, and the left and right sides are inclined surfaces. The side surface of the push block (21) matches the side inclined surface of the second scraper (18).

4. The oil-immersed power transformer according to claim 3 is characterized in that: Notches (25) corresponding to and fitting the guide rail (15) are provided at both ends of the bottom of the second scraper (18).

5. The oil-immersed power transformer according to claim 4, characterized in that: The displacement transverse plate (11) and the second scraper (18) have the same length, and the front and rear sides of the displacement transverse plate (11) and the second scraper (18) are both fitted with and slidably connected to the front and rear sides of the inner cavity of the cleaning space; The surrounding side walls of the first scraper (10) are in close contact with the inner wall of the cleaning space and are slidably connected thereto.

6. The oil-immersed power transformer according to claim 5, characterized in that: The driving mechanism comprises a bidirectional screw (12) rotatably connected to the lower end of the inner cavity of the cleaning space via a sealed bearing, one end of the bidirectional screw (12) extends to the outside of the oil tank (1) and is provided with a driving part (7) for driving the bidirectional screw (12) to rotate, the driving part (7) being a knob or a hand wheel, the outer sides of both ends of the bidirectional screw (12) are symmetrically threaded with moving blocks (23), the bottom ends of the first scraper (10) are symmetrically provided with supports (22) corresponding to the moving blocks (23), and a connecting rod (24) is movably connected between the support (22) and the moving block (23) via a pin shaft.

7. The oil-immersed power transformer according to claim 6, characterized in that: A pressure mechanism for pressurizing the interior of the oil tank (1) is disposed on one side of the oil tank (1), the pressure mechanism comprising an air pump (31) disposed on a side of the oil tank (1) close to the drive unit (7), a third spring (32) for resetting the air pump (31) is disposed inside the air pump (31), arc-shaped protrusions are evenly disposed on the outside of the drive unit (7), the lower end of the air pump (31) corresponds to and abuts against the drive unit (7), and the air outlet of the air pump (31) is connected to the interior of the oil tank (1).

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