An oil-immersed power transformer

Abstract

The application relates to the technical field of power transformers, and discloses an oil-immersed power transformer which comprises a box body, a heat dissipation fin is fixedly connected to the front part of the box body, a switch device is arranged on the right side of the box body, a porcelain piece is fixedly connected to the top of the box body, a cleaning device is arranged on the top of the heat dissipation fin, fire extinguishing devices are arranged on the two sides of the cleaning device, a heat dissipation box is fixedly connected to the top of the box body, an oil pump is fixedly connected to the top of the inner wall of the heat dissipation box, and the horizontal motor, the horizontal column, the bevel gear one, the bevel gear two, the small reciprocating screw rod, the fixed plate, the switch, the n-shaped plate and the Y-shaped plate are cooperatively operated, so that the switch can be closed, the switch can be timely closed to prevent a larger fire, and the safety of manual operation is ensured.

Description

Technical Field

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

[0002] A transformer is a static electrical device used to transform AC voltage and current to transmit AC electrical energy. Power transformers are essential equipment for power transmission and distribution, as well as power distribution to users. Oil-immersed power transformers are designed to enhance insulation and cooling conditions, with the transformer core and windings immersed together in an oil tank filled with transformer oil.

[0003] Patent CN114242389A discloses an oil-immersed power transformer, relating to the field of transformer technology. It addresses the problems of dust and other impurities accumulating on the surface of corrugated radiators, leading to reduced heat dissipation and making it difficult to accurately detect transformer leakage, posing certain safety hazards. The oil-immersed power transformer includes a transformer body; mounting blocks are provided on both sides of the bottom of the transformer body; grooved wheels are provided around the outer perimeter of the transformer body; fixing blocks are provided around the outer perimeter of the transformer body; two sets of mounting blocks are provided; and connecting blocks are provided on the top outer side of the mounting blocks. This device, by incorporating the transformer body, grooved wheels, fixing blocks, a first cleaning plate, and a second cleaning plate, prevents dust and other impurities from adhering to the surface of the corrugated radiator, effectively avoiding the problem of reduced heat dissipation and improving the service life of the transformer body. It also reduces the maintenance burden on workers. However, it has drawbacks such as failure to cut off power in case of fire and the potential for switch jamming to prevent switch rebound. Therefore, an oil-immersed power transformer is proposed to solve these problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an oil-immersed power transformer in view of the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an oil-immersed power transformer, including a tank, a heat sink fixedly connected to the front of the tank, a switching device arranged on the right side of the tank, a ceramic component fixedly connected to the top of the tank, a cleaning device arranged on the top of the heat sink, fire extinguishing devices arranged on both sides of the cleaning device, a heat dissipation box fixedly connected to the top of the tank, and an oil pump fixedly connected to the top of the inner wall of the heat dissipation box. The switching device includes a horizontal motor, a horizontal column, a first bevel gear, a second bevel gear, a small reciprocating lead screw, a fixed plate, a switch, an n-shaped plate, and a Y-shaped plate. The horizontal motor is fixedly connected to the top of the tank, the horizontal column is fixedly connected to the output end of the horizontal motor, the first bevel gear is fixedly connected to the circumferential surface of the horizontal column, the fixed plate is fixedly connected to the right side of the tank, the small reciprocating lead screw is rotatably connected to the inner wall of the fixed plate, the second bevel gear is fixedly connected to the circumferential surface of the small reciprocating lead screw, the switch is fixedly connected to the right side of the tank, the n-shaped plate moves on the circumferential surface of the small reciprocating lead screw, and the Y-shaped plate... The switch device, which is fixedly connected to the bottom of the n-shaped plate, also includes a fixing block, a pressing plate, a small spring, a snap-fit ​​plate, a snap-fit ​​box, and a fixing strip. The fixing block is fixedly connected to the front of the Y-shaped plate, the pressing plate is fixedly connected to the bottom of the fixing block, the small spring is fixedly connected to the right side of the pressing plate, the snap-fit ​​plate is rotatably connected to the circumferential surface of the pressing plate, the fixing strip is fixedly connected to the right side of the switch, the snap-fit ​​box is fixedly connected to the right side of the fixing strip, and the two ends of the small spring are fixedly connected to the right side of the pressing plate and the left side of the snap-fit ​​plate, respectively. The first surface of the bevel gear meshes with the second surface of the bevel gear. This oil-immersed power transformer, through the coordinated operation of the horizontal motor, horizontal column, bevel gear one, bevel gear two, small reciprocating screw, fixing plate, switch, n-shaped plate, and Y-shaped plate, can close the switch in a timely manner to prevent a larger fire and ensure human safety. Through the coordinated operation of the fixing block, pressing plate, small spring, snap-fit ​​plate, snap-fit ​​box, and fixing strip, the snap-fit ​​plate is locked in the snap-fit ​​box, which can prevent the switch from rebounding.

[0006] Preferably, the cleaning device includes a vertical motor, a scraper, a large reciprocating screw, a vertical bar, a support rod, a rotating wheel, a scraper blade, a conductive plate, a triangular prism, a limiting ring, a compression spring, a scraping block, a sliding column, and an L-plate. The vertical motor is fixedly connected to the top of the heat sink, the large reciprocating screw is fixedly connected to the output end of the vertical motor, the scraper is movable on the circumferential surface of the large reciprocating screw, the scraper blade is fixedly connected to the rear of the scraper, the conductive plate is fixedly connected to the inner wall of the heat sink, the vertical bar is fixedly connected to the top of the scraper blade, the support rod is fixedly connected to the inner sides of the two vertical bars, the rotating wheel is rotatably connected to the circumferential surface of the support rod, the L-plate is fixedly connected to the top of the heat sink, the triangular prism is slidably connected to the bottom of the L-plate, the sliding column is fixedly connected to the rear of the triangular prism, the limiting ring is fixedly connected to the circumferential surface of the sliding column, the compression spring is fixedly connected to the rear of the limiting ring, and the scraping block is fixedly connected to the rear of the sliding column. The cleaning device also includes a compression block, a large spring, a compression column, a protrusion, and a vertical spring. The oil-immersed power transformer comprises a connecting plate and a collection box. The connecting plate is fixedly connected to the bottom of the scraper, the collection box is fixedly connected to the top of the housing, the large spring is fixedly connected to the top of the collection box, the squeezing block is fixedly connected to the top of the large spring, the squeezing column is fixedly connected to the bottom of the scraper block, the vertical spring is fixedly connected to the top of the housing, and the protrusion is fixedly connected to the top of the collection box. The inner side of the scraper contacts the surface of the conductive plate, and both ends of the squeezing spring are fixedly connected to the rear of the limiting ring and the inner wall of the L-plate, respectively. Through the coordinated operation of the vertical motor, scraper, large reciprocating screw, vertical bar, support rod, rotating wheel, scraper, conductive plate, triangular column, limiting ring, squeezing spring, scraper block, sliding column, and L-plate, the transformer can clean the dust on the surface of the conductive plate, preventing it from affecting its heat dissipation effect. Through the coordinated operation of the squeezing block, large spring, squeezing column, protrusion, vertical spring, connecting plate, and collection box, the bottom of the collection box can be vibrated to distribute the dust evenly, preventing it from accumulating and affecting the cleaning effect.

[0007] Preferably, the fire extinguishing device includes a temperature sensor, a dry powder box, a fixed column, an L-block, a limiting spring, a limiting block, a rotating column, a push plate, a hollow column, an electric valve, and a frustum. The fixed column is fixedly connected to the circumferential surface of the limiting ring, the L-block is fixedly connected to the right side of the heat dissipation box, the limiting spring is fixedly connected to the top of the L-block, the rotating column is rotatably connected to the top of the L-block, the push plate is fixedly connected to the circumferential surface of the rotating column, the frustum is fixedly connected to the top of the rotating column, the dry powder box is rotatably connected to the top of the frustum, the hollow column is fixedly connected to the inner wall of the frustum, the temperature sensor is fixedly connected to the bottom of the dry powder box, and the electric valve is fixedly connected to the right side of the hollow column. The fire extinguishing device also includes a third bevel gear, a fourth bevel gear, a horizontal reciprocating screw, and a dispersion block. The third bevel gear is fixedly connected to the large reciprocating screw. On the circumference, the horizontal reciprocating screw is rotatably connected to the inner wall of the dry powder box, the dispersing block is movably connected to the circumference of the horizontal reciprocating screw, the fourth bevel gear is fixedly connected to the circumference of the horizontal reciprocating screw, the third bevel gear surface meshes with the fourth bevel gear surface, and the bottom of the dispersing block contacts the bottom of the inner wall of the dry powder box. This oil-immersed power transformer, through the coordinated operation of the temperature sensor, dry powder box, fixed column, L-block, limiting spring, limiting block, rotating column, push plate, hollow column and electric valve, can make the dry powder inside the dry powder box spray out from the hollow column, which can control the fire and prevent the fire from getting bigger. Through the coordinated operation of the third bevel gear, the fourth bevel gear, the horizontal reciprocating screw, the dispersing block and the truncated cone, the dry powder in the middle of the dry powder box can be pushed to the top of the truncated cone, which can enhance its fire extinguishing effect and prevent the waste of dry powder.

[0008] The present invention, by adopting the above technical solution, can bring the following beneficial effects:

[0009] 1. This oil-immersed power transformer, through the coordinated operation of a horizontal motor, horizontal column, bevel gear one, bevel gear two, small reciprocating screw, fixed plate, switch, n-shaped plate and Y-shaped plate, can close the switch in a timely manner to prevent a larger fire and ensure personnel safety. Through the coordinated operation of a fixed block, squeezing plate, small spring, snap plate, snap box and fixed strip, the snap plate is locked in the snap box, which can prevent the switch from rebounding.

[0010] 2. This oil-immersed power transformer, through the coordinated operation of a vertical motor, scraper, large reciprocating lead screw, vertical bar, support rod, rotating wheel, scraper strip, conductive plate, triangular prism, limiting ring, compression spring, dust scraper block, sliding column, and L-plate, can clean the dust on the surface of the conductive plate, preventing it from affecting its heat dissipation. Through the coordinated operation of the compression block, large spring, compression column, protrusion, vertical spring, connecting plate, and collection box, it can vibrate the bottom of the collection box to distribute the dust evenly, preventing it from accumulating and affecting its cleaning effect.

[0011] 3. This oil-immersed power transformer, through the coordinated operation of temperature sensor, dry powder box, fixed column, L-block, limiting spring, limiting block, rotating column, push plate, hollow column and electric valve, can make the dry powder inside the dry powder box spray out from the hollow column, which can control the fire and prevent the fire from getting bigger. Through the coordinated operation of bevel gear three, bevel gear four, horizontal reciprocating screw, dispersion block and truncated cone, the dry powder in the middle of the dry powder box can be pushed to the top of the truncated cone, which can enhance its fire extinguishing effect and at the same time prevent the waste of dry powder. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0013] Figure 2 This is a half-sectional schematic diagram of the overall structure of the present invention;

[0014] Figure 3 This is a schematic diagram of the switching device structure of the present invention;

[0015] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of structure A in the middle;

[0016] Figure 5 This is a schematic diagram of the cleaning device of the present invention;

[0017] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the C-structure;

[0018] Figure 7 This is a schematic diagram of the extrusion column structure of the present invention;

[0019] Figure 8 This is a schematic diagram of the fire extinguishing device of the present invention;

[0020] Figure 9 This is a schematic diagram of the dry powder box structure of the present invention;

[0021] Figure 10 For the present invention Figure 8 Enlarged schematic diagram of the B-structure.

[0022] In the diagram: 1. Housing; 2. Switching device; 201. Horizontal motor; 202. Horizontal column; 203. Bevel gear one; 204. Bevel gear two; 205. Small reciprocating lead screw; 206. Fixing plate; 207. Switch; 208. N-shaped plate; 209. Y-shaped plate; 210. Fixing block; 211. Extrusion plate; 212. Small spring; 213. Snap plate; 214. Snap box; 215. Fixing strip; 3. Cleaning device; 301. Vertical motor; 302. Scraper; 303. Large reciprocating lead screw; 304. Vertical strip; 305. Support rod; 306. Rotating wheel; 307. Scraper; 308. Conducting plate; 309. Triangular prism; 310. Restriction ring; 311. Extrusion spring 312. Scraper block; 313. Sliding column; 314. L-plate; 315. Extrusion block; 316. Large spring; 317. Extrusion column; 318. Protrusion block; 319. Vertical spring; 320. Connecting plate; 321. Collection box; 4. Fire extinguishing device; 401. Temperature sensor; 402. Dry powder box; 403. Fixed column; 404. L-block; 405. Restriction spring; 406. Restriction block; 407. Rotating column; 408. Push plate; 409. Hollow column; 410. Electric valve; 411. Bevel gear three; 412. Bevel gear four; 413. Horizontal reciprocating screw; 414. Dispersing block; 415. Frustum; 5. Ceramic component; 6. Heat sink; 7. Heat sink box; 8. Oil pump. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1-10One embodiment of the present invention is as follows: an oil-immersed power transformer includes a housing 1, a heat sink 6 fixedly connected to the front of the housing 1, a switch device 2 provided on the right side of the housing 1, a ceramic piece 5 fixedly connected to the top of the housing 1, a cleaning device 3 provided on the top of the heat sink 6, fire extinguishing devices 4 provided on both sides of the cleaning device 3, a heat dissipation box 7 fixedly connected to the top of the housing 1, an oil pump 8 fixedly connected to the top of the inner wall of the heat dissipation box 7, and a switch device 2 including a horizontal motor 201, a horizontal column 202, a first bevel gear 203, a second bevel gear 204, a small reciprocating lead screw 205, a fixing plate 206, a switch 207, an n-shaped plate 208, and a Y-shaped plate 209. The horizontal motor 201 is fixedly connected to the top of the housing 1, the horizontal column 202 is fixedly connected to the output end of the horizontal motor 201, the first bevel gear 203 is fixedly connected to the circumferential surface of the horizontal column 202, the fixing plate 206 is fixedly connected to the right side of the housing 1, and the small reciprocating lead screw 205 is rotatably connected inside the fixing plate 206. The wall, bevel gear 204 is fixedly connected to the circumferential surface of the small reciprocating lead screw 205, switch 207 is fixedly connected to the right side of the housing 1, n-shaped plate 208 is movable on the circumferential surface of the small reciprocating lead screw 205, Y-shaped plate 209 is fixedly connected to the bottom of n-shaped plate 208, and the switch device 2 also includes a fixing block 210, a pressing plate 211, a small spring 212, a snap-fit ​​plate 213, a snap-fit ​​box 214 and a fixing strip 215. The fixing block 210 is fixedly connected to the front of the Y-shaped plate 209. The extrusion plate 211 is fixedly connected to the bottom of the fixing block 210, the small spring 212 is fixedly connected to the right side of the extrusion plate 211, the buckle plate 213 is rotatably connected to the circumferential surface of the extrusion plate 211, the fixing strip 215 is fixedly connected to the right side of the switch 207, the buckle box 214 is fixedly connected to the right side of the fixing strip 215, the two ends of the small spring 212 are fixedly connected to the right side of the extrusion plate 211 and the left side of the buckle plate 213 respectively, and the surface of the first bevel gear 203 meshes with the surface of the second bevel gear 204.

[0025] Working principle: When a fire occurs, the horizontal motor 201 drives the horizontal column 202 to rotate, which in turn drives the bevel gear 1 203 to rotate. The bevel gear 1 203 drives the bevel gear 204 to rotate, which in turn drives the small reciprocating screw 205 to rotate. The small reciprocating screw 205 drives the n-shaped plate 208 to move, which in turn drives the Y-shaped plate 209 to move. The Y-shaped plate 209 closes the switch 207, which can promptly shut off the switch 207 to prevent a larger fire and ensure personnel safety. The Y-shaped plate 209 drives the fixing block 210 to move downward, which in turn drives the pressing plate 211 to move downward. The pressing plate 211 drives the latching plate 213 to move downward, which allows the latching plate 213 to enter the latching box 214, thus locking the latching plate 213 in the latching box 214 and preventing the switch 207 from rebounding.

[0026] Please see Figures 1-10Based on the above embodiments, in another embodiment of the present invention, the cleaning device 3 includes a vertical motor 301, a scraper 302, a large reciprocating screw 303, a vertical bar 304, a support rod 305, a rotating wheel 306, a scraper 307, a conductive plate 308, a triangular prism 309, a limiting ring 310, a compression spring 311, a scraper block 312, a sliding column 313, and an L-plate 314. The vertical motor 301 is fixedly connected to the top of the heat sink 6, the large reciprocating screw 303 is fixedly connected to the output end of the vertical motor 301, the scraper 302 moves on the circumferential surface of the large reciprocating screw 303, the scraper 307 is fixedly connected to the rear of the scraper 302, the conductive plate 308 is fixedly connected to the inner wall of the heat sink 7, the vertical bar 304 is fixedly connected to the top of the scraper 307, and the support rod 305. Rod 305 is fixedly connected to the inner side of two vertical bars 304. Rotating wheel 306 is rotatably connected to the circumferential surface of support rod 305. L-plate 314 is fixedly connected to the top of heat dissipation box 7. Triangular prism 309 is slidably connected to the bottom of L-plate 314. Sliding column 313 is fixedly connected to the rear of triangular prism 309. Restriction ring 310 is fixedly connected to the circumferential surface of sliding column 313. Compression spring 311 is fixedly connected to the rear of restriction ring 310. Scraper block 312 is fixedly connected to the rear of sliding column 313. Cleaning device 3 also includes compression block 315, large spring 316, compression column 317, protrusion 318, vertical spring 319, connecting plate 320, and collection box 321. Connecting plate 320 is fixedly connected to the bottom of scraper 307. Collection box 321 is fixedly connected to box 1. At the top, a large spring 316 is fixedly connected to the top of the collection box 321, a squeezing block 315 is fixedly connected to the top of the large spring 316, a squeezing column 317 is fixedly connected to the bottom of the scraper block 312, a vertical spring 319 is fixedly connected to the top of the box 1, a protrusion 318 is fixedly connected to the top of the collection box 321, the inner side of the scraper 307 contacts the surface of the conductive plate 308, and both ends of the squeezing spring 311 are fixedly connected to the rear of the limiting ring 310 and the inner wall of the L-plate 314, respectively. The fire extinguishing device 4 includes a temperature sensor 401, a dry powder box 402, a fixed column 403, an L-plate 404, a limiting spring 405, a limiting block 406, a rotating column 407, a push plate 408, a hollow column 409, an electric valve 410, and a frustum 415. The fixed column 403 is fixedly connected to the limiting spring 316. The fire extinguishing device 4 includes a ring 310 on its circumferential surface, an L-block 404 fixedly connected to the right side of the heat sink 7, a limiting spring 405 fixedly connected to the top of the L-block 404, a rotating column 407 rotatably connected to the top of the L-block 404, a push plate 408 fixedly connected to the circumferential surface of the rotating column 407, a frustum 415 fixedly connected to the top of the rotating column 407, a dry powder box 402 rotatably connected to the top of the frustum 415, a hollow column 409 fixedly connected to the inner wall of the frustum 415, a temperature sensor 401 fixedly connected to the bottom of the dry powder box 402, and an electric valve 410 fixedly connected to the right side of the hollow column 409. The fire extinguishing device 4 also includes a bevel gear 311, a bevel gear 412, a horizontal reciprocating screw 413, and a dispersion block 414. The bevel gear 311 is fixedly connected to the circumferential surface of the large reciprocating screw 303.A horizontal reciprocating screw 413 is rotatably connected to the inner wall of the dry powder box 402. A dispersing block 414 is movably connected to the circumferential surface of the horizontal reciprocating screw 413. A bevel gear 412 is fixedly connected to the circumferential surface of the horizontal reciprocating screw 413. The surface of the bevel gear 411 meshes with the surface of the bevel gear 412. The bottom of the dispersing block 414 contacts the bottom of the inner wall of the dry powder box 402.

[0027] Working principle: The vertical motor 301 drives the large reciprocating screw 303 to rotate, which in turn drives the scraper 302 to reciprocate. The scraper 302 then drives the scraper strip 307 to reciprocate, thus cleaning the dust on the surface of the conductive plate 308 and preventing it from affecting the transformer's heat dissipation. The scraper 302 drives the vertical strip 304 to move upward, which in turn drives the support rod 305 to move upward. The support rod 305 then drives the rotating wheel 306 to move upward. The rotating wheel 306 presses against the triangular prism 309, causing it to move backward. The triangular prism 309 then drives the sliding column 313 to move backward, which in turn drives the limiting ring 310 to move backward, simultaneously compressing the compression spring 311. The sliding column 313 then drives the dust scraper block 312. The scraper moves backward to clean the dust on the surface of the conductive plate 308, preventing it from affecting its heat dissipation. The scraper 307 moves downward, causing the connecting plate 320 to move downward. The connecting plate 320 squeezes the squeezing block 315, which in turn squeezes the large spring 316, making the dust on the surface of the collection box 321 evenly distributed. The scraper block 312 drives the squeezing column 317 to move backward. The squeezing column 317 squeezes the protrusion 318, which compresses the vertical spring 319. When the squeezing column 317 stops squeezing the protrusion 318, the protrusion 318 moves upward due to the restoring effect of the vertical spring 319. Repeating this operation can vibrate the bottom of the collection box 321 to make the dust on it evenly distributed, preventing it from accumulating and affecting its cleaning effect.

[0028] The backward movement of the limiting ring 310 causes the fixed column 403 to move backward, which in turn pushes the push plate 408 to move backward. The push plate 408 causes the rotating column 407 to rotate, which in turn causes the frustum 415 to rotate. The frustum 415 then causes the hollow column 409 to rotate. When a fire occurs in the transformer, the electric valve 410 opens, allowing the dry powder inside the dry powder box to be sprayed out from the hollow column 409, which can control the fire and prevent it from escalating. The large reciprocating screw 303 drives the bevel gear 3 411 to rotate, which in turn drives the bevel gear 412 to rotate. The bevel gear 412 then drives the horizontal reciprocating screw 413 to rotate, which in turn drives the dispersing block 414 to move back and forth. This pushes the dry powder in the middle of the dry powder box 402 to the top of the frustum 415, enhancing its fire extinguishing effect and preventing the waste of dry powder.

[0029] This invention provides an oil-immersed power transformer. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technologies.

Claims

1. An oil-immersed power transformer comprising a tank (1), characterized in that: The box (1) is fixedly connected with a fin (6) in front, a switch device (2) is arranged on the right side of the box (1), a porcelain piece (5) is fixedly connected to the top of the box (1), a cleaning device (3) is arranged on the top of the fin (6), fire extinguishing devices (4) are arranged on the two sides of the cleaning device (3), a heat dissipation box (7) is fixedly connected to the top of the box (1), and an oil pump (8) is fixedly connected to the top of the inner wall of the heat dissipation box (7). The switch device (2) comprises a horizontal motor (201), a horizontal column (202), a bevel gear one (203), a bevel gear two (204), a small reciprocating lead screw (205), a fixed plate (206), a switch (207), an n-shaped plate (208) and a Y-shaped plate (209), the horizontal motor (201) is fixedly connected to the top of the box (1), the horizontal column (202) is fixedly connected to the output end of the horizontal motor (201), the bevel gear one (203) is fixedly connected to the circumferential surface of the horizontal column (202), the fixed plate (206) is fixedly connected to the right side of the box (1), the small reciprocating lead screw (205) is rotatably connected to the inner wall of the fixed plate (206), the bevel gear two (204) is fixedly connected to the circumferential surface of the small reciprocating lead screw (205), the switch (207) is fixedly connected to the right side of the box (1), the n-shaped plate (208) is movably arranged on the circumferential surface of the small reciprocating lead screw (205), and the Y-shaped plate (209) is fixedly connected to the bottom of the n-shaped plate (208).

2. An oil immersed power transformer according to claim 1, characterized in that: The switch device (2) further comprises a fixed block (210), an extrusion plate (211), a small spring (212), a buckle plate (213), a buckle box (214) and a fixed strip (215), the fixed block (210) is fixedly connected to the front of the Y-shaped plate (209), the extrusion plate (211) is fixedly connected to the bottom of the fixed block (210), the small spring (212) is fixedly connected to the right side of the extrusion plate (211), the buckle plate (213) is rotatably connected to the circumferential surface of the extrusion plate (211), the fixed strip (215) is fixedly connected to the right side of the switch (207), and the buckle box (214) is fixedly connected to the right side of the fixed strip (215).

3. An oil immersed power transformer according to claim 2, characterized in that: The small spring (212) is fixedly connected to the right side of the extrusion plate (211) and the left side of the buckle plate (213) respectively, and the surface of the bevel gear one (203) is engaged with the surface of the bevel gear two (204).

4. An oil immersed power transformer according to claim 3, characterized in that: The cleaning device (3) comprises a vertical motor (301), a scraper (302), a large reciprocating screw rod (303), a vertical bar (304), a support rod (305), a rotating wheel (306), a scraping strip (307), a conducting sheet (308), a triangular column (309), a limiting ring (310), a pressing spring (311), a dust scraping block (312), a sliding column (313) and an L plate (314), the vertical motor (301) is fixedly connected to the top of the heat dissipation fin (6), the large reciprocating screw rod (303) is fixedly connected to the output end of the vertical motor (301), the scraper (302) is movably arranged on the circumferential surface of the large reciprocating screw rod (303), the scraping strip (307) is fixedly connected to the rear part of the scraper (302), the conducting sheet (308) is fixedly connected to the inner wall of the heat dissipation box (7), the vertical bar (304) is fixedly connected to the top of the scraping strip (307), the support rod (305) is fixedly connected to the inner side of the two vertical bars (304), the rotating wheel (306) is rotatably connected to the circumferential surface of the support rod (305), the L plate (314) is fixedly connected to the top of the heat dissipation box (7), the triangular column (309) is slidably connected to the bottom of the L plate (314), the sliding column (313) is fixedly connected to the rear part of the triangular column (309), the limiting ring (310) is fixedly connected to the circumferential surface of the sliding column (313), the pressing spring (311) is fixedly connected to the rear part of the limiting ring (310), and the dust scraping block (312) is fixedly connected to the rear part of the sliding column (313).

5. An oil immersed power transformer according to claim 4, characterized in that: The cleaning device (3) further comprises a pressing block (315), a large spring (316), a pressing column (317), a protruding block (318), a vertical spring (319), a connecting plate (320) and a collecting box (321), the connecting plate (320) is fixedly connected to the bottom of the scraping strip (307), the collecting box (321) is fixedly connected to the top of the box body (1), the large spring (316) is fixedly connected to the top of the collecting box (321), the pressing block (315) is fixedly connected to the top of the large spring (316), the pressing column (317) is fixedly connected to the bottom of the dust scraping block (312), the vertical spring (319) is fixedly connected to the top of the box body (1), and the protruding block (318) is fixedly connected to the top of the collecting box (321).

6. An oil immersed power transformer according to claim 5, characterized in that: The inner side of the scraping strip (307) is in contact with the surface of the conducting sheet (308), and the pressing spring (311) is fixedly connected to the rear part of the limiting ring (310) and the inner wall of the L plate (314) respectively.

7. An oil immersed power transformer according to claim 6, characterized in that: The fire extinguishing device (4) includes a temperature sensor (401), a dry powder tank (402), a fixed column (403), an L block (404), a limiting spring (405), a limiting block (406), a rotating column (407), a push plate (408), a hollow column (409), an electric valve (410) and a circular table (415), the fixed column (403) is fixedly connected to the circumferential surface of the limiting ring (310), the L block (404) is fixedly connected to the right side of the heat dissipation box (7), the limiting spring (405) is fixedly connected to the top of the L block (404), the rotating column (407) is rotatably connected to the top of the L block (404), the push plate (408) is fixedly connected to the circumferential surface of the rotating column (407), the circular table (415) is fixedly connected to the top of the rotating column (407), the dry powder tank (402) is rotatably connected to the top of the circular table (415), the hollow column (409) is fixedly connected to the inner wall of the circular table (415), the temperature sensor (401) is fixedly connected to the bottom of the dry powder tank (402), and the electric valve (410) is fixedly connected to the right side of the hollow column (409). The fire extinguishing device (4) further includes a bevel gear three (411), a bevel gear four (412), a horizontal reciprocating screw rod (413) and a dispersing block (414), the bevel gear three (411) is fixedly connected to the circumferential surface of the large reciprocating screw rod (303), the horizontal reciprocating screw rod (413) is rotatably connected to the inner wall of the dry powder tank (402), the dispersing block (414) is movably connected to the circumferential surface of the horizontal reciprocating screw rod (413), and the bevel gear four (412) is fixedly connected to the circumferential surface of the horizontal reciprocating screw rod (413).

8. An oil immersed power transformer according to claim 7, characterized in that: The surface of the bevel gear three (411) is engaged with the surface of the bevel gear four (412), and the bottom of the dispersing block (414) is in contact with the bottom of the inner wall of the dry powder tank (402).

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