A low-noise dry-type distribution transformer

Abstract

This invention relates to the field of transformer technology, specifically to a low-noise dry-type distribution transformer, comprising a support and multiple transformer bodies. A noise reduction mechanism is installed on the support. The transformer body includes an iron core, a low-voltage winding, and a high-voltage winding. Both the low-voltage and high-voltage windings are coaxial with the iron core and sequentially mounted on it. A ventilation duct is coaxially arranged between the low-voltage and high-voltage windings, and cleaning rollers are rotatably mounted on both the inner and outer sides of the ventilation duct. This low-noise dry-type distribution transformer, by configuring an iron core, low-voltage windings, a ventilation duct, and high-voltage windings, utilizes air cooling during transformer operation to drive the ventilation duct to rotate around its own axis. The cleaning rollers clean the outer peripheral walls of the low-voltage windings and the inner peripheral walls of the high-voltage windings, preventing dust from adhering to their surfaces, improving heat dissipation, and extending the transformer's service life.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and specifically to a low-noise dry-type distribution transformer. Background Technology

[0002] Dry-type distribution transformers, as special transformers whose cores and windings are not impregnated with insulating oil, are widely used in various fields due to their safety and environmental protection characteristics. However, during operation, transformers generate noise due to magnetostriction and other factors. This noise not only pollutes the surrounding environment but can also affect people's normal lives and work. The noise problem of traditional dry-type transformers is particularly prominent in places with high noise control requirements, such as hospitals and schools.

[0003] Chinese patent CN220914033U discloses a low-noise dry-type transformer. Through the combination of clamps and sound-absorbing cotton, the vibration generated by the main body of the dry-type transformer during operation can be reduced, thereby achieving the purpose of reducing noise and extending the service life of the main body of the dry-type transformer. However, the transformer in this solution generates a large amount of heat inside during use. If the heat generated by the dry-type transformer cannot be effectively dissipated to the outside in time, the internal components of the dry-type transformer will eventually be damaged due to high temperature.

[0004] Currently, common cooling methods for dry-type transformers include natural air cooling and forced air cooling. Natural air cooling can ensure that the transformer can operate continuously and stably at its rated capacity. Although forced air cooling can quickly reduce the surface temperature of the windings, it has the problems of uneven temperature distribution in the heat dissipation channels and local heat dissipation failure.

[0005] Chinese patent CN119008175B discloses an energy-saving dry-type transformer. By installing a heat insulation cylinder within the cooling air duct between the high-voltage and low-voltage windings, the cooling air duct is divided into two separate heat dissipation areas. The airflow enters the cooling air duct in opposite directions to cool the high-voltage and low-voltage windings, effectively preventing the large temperature difference between the inlet and outlet of the cooling air duct that occurs with traditional unidirectional airflow cooling. However, in this design, dust adheres to the surfaces of the two windings during air-cooled cooling, significantly reducing heat dissipation efficiency and resulting in an unsatisfactory cooling effect, thus affecting the transformer's service life. Summary of the Invention

[0006] This invention provides a low-noise dry-type distribution transformer to solve the problem that existing low-noise dry-type distribution transformers have poor heat dissipation during use, which affects the service life of the transformer.

[0007] The present invention provides a low-noise dry-type distribution transformer with the following technical solution: A low-noise dry-type distribution transformer includes a support and multiple transformer bodies, and a noise reduction mechanism is provided on the support; multiple transformer bodies are arranged sequentially in the horizontal direction on the support, and the upper and lower ends of the multiple transformer bodies are connected by brackets respectively; the transformer body includes an iron core, a low-voltage winding, and a high-voltage winding; the axis of the iron core is arranged in the vertical direction, and the low-voltage winding and the high-voltage winding are coaxial with the iron core and sequentially sleeved on the iron core, with the low-voltage winding located close to the high-voltage winding in the horizontal direction. On one side of the vertical central axis of the core; a duct is coaxially arranged between the low-voltage winding and the high-voltage winding. The duct is rotatably mounted on the bracket around its own axis, and a first air passage is formed between the duct and the low-voltage winding, and a second air passage is formed between the duct and the high-voltage winding; a fan is arranged on the bracket at the lower end, and the fan can deliver air into the first and second air passages when it is started; cleaning rollers are rotatably arranged on the inner and outer sides of the duct, with the inner cleaning roller always abutting against the outer peripheral wall of the low-voltage winding, and the outer cleaning roller always abutting against the inner peripheral wall of the high-voltage winding.

[0008] Furthermore, the ventilation duct is equipped with multiple air-guiding vanes, all of which are inclined.

[0009] Furthermore, the air duct has multiple through holes, and the cross-section of the air duct perpendicular to its axis is elliptical. The cleaning rollers on the inner and outer sides of the air duct are referred to as the first roller and the second roller, respectively. The first roller is located on the long side of the air duct, between the outer peripheral wall of the air duct and the inner peripheral wall of the high voltage winding, and abuts against the inner peripheral wall of the high voltage winding. The second roller is located on the short side of the air duct, between the inner peripheral wall of the air duct and the outer peripheral wall of the low voltage winding, and abuts against the outer peripheral wall of the low voltage winding.

[0010] Furthermore, the ventilation duct includes multiple first cylinders and multiple second cylinders arranged sequentially in the vertical direction, with the first and second cylinders alternating in the vertical direction; the first and second cylinders are coaxially arranged and fixedly connected, and the cross-sections of the first and second cylinders perpendicular to their axes are both elliptical; the diameter of the first cylinder is larger than the diameter of the second cylinder, and the distances from the long side and short side of the first cylinder along its radial direction to the inner peripheral wall of the high-voltage winding are both smaller than the distances from the long side and short side of the first cylinder along its radial direction to the outer peripheral wall of the low-voltage winding; the distances from the long side and short side of the second cylinder along its radial direction to the inner peripheral wall of the high-voltage winding are both greater than the distances from the long side and short side of the second cylinder along its radial direction to the outer peripheral wall of the low-voltage winding.

[0011] Furthermore, a first water spraying element is provided on the inner peripheral wall of the first cylinder, which is used to spray water onto the outer peripheral wall of the low-voltage winding; a second water spraying element is provided on the outer peripheral wall of the second cylinder, which is used to spray water onto the inner peripheral wall of the high-voltage winding.

[0012] Furthermore, the first water spray component includes a rotating rod and multiple water cylinders, each corresponding to a first cylinder body. The water cylinders are mounted on the inner circumferential wall of their respective first cylinder bodies. The rotating rod, arranged vertically and capable of rotating around its own axis, is mounted on either the first or second cylinder body. The rotating rod passes through the multiple water cylinders sequentially in the vertical direction and is sealed to them. Each water cylinder contains a piston plate, which slides and seals with its corresponding water cylinder, dividing the interior of the water cylinder into an upper chamber and a lower chamber arranged vertically in sequence. The upper chamber is located above the lower chamber, which contains water. The piston plates are helically engaged with the rotating rod, and the piston plates can move up and down when the rotating rod rotates around its own axis. A nozzle is mounted on each water cylinder, and the nozzle communicates with the lower chamber. The structure of the second water spray component is the same as that of the first water spray component, and the water cylinder of the second water spray component is mounted on the outer circumferential wall of its corresponding second cylinder body.

[0013] Furthermore, the upper end of the first or second cylinder is provided with a housing for mounting the first and second rollers. The housing for mounting the first roller is referred to as the first housing, and the housing for mounting the second roller is referred to as the second housing. The rotating rod of the first water spray component is referred to as the first rotating rod, and the rotating rod of the second water spray component is referred to as the second rotating rod. A first transmission component is provided inside the first housing, which is used to drive the first rotating rod to rotate around its own axis. A second transmission component is provided inside the second housing, which is used to drive the second rotating rod to rotate around its own axis.

[0014] Furthermore, the water cylinder of the first water spray component is referred to as the first water cylinder, and the water cylinder of the second water spray component is referred to as the second water cylinder. Both the first rotating rod and the second rotating rod are hollow rods and are connected to an external water pipe. Both the first rotating rod and the second rotating rod are provided with multiple water inlet holes. The multiple water inlet holes on the first rotating rod are arranged one-to-one with the multiple first water cylinders and are located in the lower cavity of the corresponding first water cylinder. The multiple water inlet holes on the second rotating rod are arranged one-to-one with the multiple second water cylinders and are located in the lower cavity of the corresponding second water cylinders.

[0015] Furthermore, a turntable is fixedly installed on both the first and second rotating rods.

[0016] Furthermore, the noise reduction mechanism is a shock-absorbing spring.

[0017] The beneficial effects of this invention are as follows: This low-noise dry-type distribution transformer, by configuring an iron core, low-voltage winding, air duct, and high-voltage winding, allows for efficient operation. When the transformer is in use, a fan is activated to deliver air into the first and second air ducts. When the air passes through the first air duct, it cools the low-voltage winding; when it passes through the second air duct, it cools the high-voltage winding. Simultaneously, the air duct is driven to rotate around its own axis. During this rotation, the inner cleaning roller cleans the outer peripheral wall of the low-voltage winding, and the outer cleaning roller cleans the inner peripheral wall of the high-voltage winding, preventing dust from adhering to the surfaces of both windings, improving heat dissipation, and extending the transformer's service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a low-noise dry-type distribution transformer according to the present invention;

[0020] Figure 2 This is a cross-sectional view of the overall structure of an embodiment of a low-noise dry-type distribution transformer according to the present invention.

[0021] Figure 3 This is a schematic diagram of the ventilation duct of an embodiment of a low-noise dry-type distribution transformer according to the present invention;

[0022] Figure 4 This is a cross-sectional view of the transformer body according to an embodiment of a low-noise dry-type distribution transformer of the present invention.

[0023] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0024] Figure 6 for Figure 4 Enlarged view of point B in the middle;

[0025] Figure 7 This is a cross-sectional view of the ventilation duct of an embodiment of a low-noise dry-type distribution transformer according to the present invention.

[0026] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0027] Figure 9This is a schematic diagram of the first cylinder, the second cylinder, and the upper part of the structure of an embodiment of a low-noise dry-type distribution transformer of the present invention.

[0028] Figure 10 for Figure 9 Enlarged view of point D in the middle;

[0029] Figure 11 for Figure 9 Enlarged view of point E in the middle.

[0030] In the diagram: 100, support; 110, bracket; 120, fan; 200, transformer body; 210, iron core; 220, low-voltage winding; 230, high-voltage winding; 300, noise reduction mechanism; 400, air duct; 401, first air duct; 402, second air duct; 403, air guide vane; 404, through hole; 405, first outer shell; 406, second outer shell; 410, cleaning roller; 411, first roller; 412, second roller; 420, first cylinder; 430, second cylinder; 440, first water spray component; 441, first rotating rod; 442, first water cylinder; 443, nozzle; 444, piston plate; 445, channel; 446 447. Connecting port; 448. Water inlet hole; 450. Turntable; 451. Second water spray component; 452. Second rotating rod; 453. Second water cylinder; 460. First transmission component; 461. First pulley; 462. First tensioning pulley; 463. First follower pulley; 464. First transmission belt; 465. First gear; 466. First mating pulley; 467. First telescopic rod; 468. Second telescopic rod; 471. Second pulley; 472. Second tensioning pulley; 473. Second follower pulley; 474. Second transmission belt; 475. Second gear; 476. Second mating pulley; 477. Third telescopic rod; 478. Fourth telescopic rod; 480. Water valve. Detailed Implementation

[0031] 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.

[0032] An embodiment of a low-noise dry-type distribution transformer of the present invention, such as... Figures 1 to 11 As shown.

[0033] A low-noise dry-type distribution transformer includes a support 100 and multiple transformer bodies 200. A noise reduction mechanism 300 is provided on the support 100. Multiple transformer bodies 200 are arranged sequentially along the horizontal direction on the support 100, specifically three transformer bodies 200. The upper and lower ends of the multiple transformer bodies 200 are connected by brackets 110.

[0034] The transformer body 200 includes an iron core 210, a low-voltage winding 220, and a high-voltage winding 230. The axis of the iron core 210 is arranged vertically, and both the low-voltage winding 220 and the high-voltage winding 230 are cylindrical structures. The low-voltage winding 220 and the high-voltage winding 230 are coaxial with the iron core 210 and are sequentially sleeved on the iron core 210. The low-voltage winding 220 is located on the side of the high-voltage winding 230 in the horizontal direction closer to the vertical central axis of the iron core 210.

[0035] A duct 400 is coaxially arranged between the low-voltage winding 220 and the high-voltage winding 230. The duct 400 is rotatably mounted on the bracket 110 around its own axis, forming a first air passage 401 between the duct 400 and the low-voltage winding 220, and a second air passage 402 between the duct 400 and the high-voltage winding 230. A fan 120 is mounted on the lower end of the bracket 110, and the fan 120 can deliver air into the first air passage 401 and the second air passage 402 when activated. Cleaning rollers 410 are rotatably arranged on the inner and outer sides of the duct 400, respectively. The cleaning roller 410 located on the inner side is always in contact with the outer peripheral wall of the low-voltage winding 220, and the cleaning roller 410 located on the outer side is always in contact with the inner peripheral wall of the high-voltage winding 230.

[0036] Furthermore, the noise reduction mechanism 300 is a shock-absorbing spring. By setting the noise reduction mechanism 300, the noise generated by the transformer body 200 during operation is reduced.

[0037] Alternatively, sound-absorbing cotton can be installed on the bracket 110. By installing sound-absorbing cotton, the noise generated by the transformer body 200 during operation can be further reduced.

[0038] This embodiment, by setting up an iron core 210, a low-voltage winding 220, a fan duct 400, and a high-voltage winding 230, allows for the operation of the transformer. When the transformer is in use, the fan 120 is activated to deliver air into the first air duct 401 and the second air duct 402. When the air passes through the first air duct 401, it cools the low-voltage winding 220; when the air passes through the second air duct 402, it cools the high-voltage winding 230. Simultaneously with air cooling, the fan duct 400 is driven to rotate around its own axis. During this rotation, the inner cleaning roller 410 cleans the outer peripheral wall of the low-voltage winding 220, and the outer cleaning roller 410 cleans the inner peripheral wall of the high-voltage winding 230. This prevents dust from adhering to the surfaces of the low-voltage winding 220 and the high-voltage winding 230, improving heat dissipation and extending the transformer's service life.

[0039] In a further embodiment, the air duct 400 is provided with a plurality of air guide vanes 403, all of which are inclined.

[0040] By setting the induced draft vane 403, when the fan 120 starts to send air into the first air passage 401 and the second air passage 402, the induced draft vane 403 will synchronously drive the entire air duct 400 to rotate.

[0041] In a further embodiment, the air duct 400 has multiple through holes 404. The cross-section of the air duct 400 perpendicular to its axis is elliptical. The cleaning rollers 410 on the inner and outer sides of the air duct 400 are respectively referred to as the first roller 411 and the second roller 412. The first roller 411 is located on the long side of the air duct 400, between the outer peripheral wall of the air duct 400 and the inner peripheral wall of the high voltage winding 230, and is always in contact with the inner peripheral wall of the high voltage winding 230. The second roller 412 is located on the short side of the air duct 400, between the inner peripheral wall of the air duct 400 and the outer peripheral wall of the low voltage winding 220, and is always in contact with the outer peripheral wall of the low voltage winding 220.

[0042] Furthermore, there are two of each of the first roller 411 and the second roller 412. The two first rollers 411 are located at both ends of the long side of the air duct 400, and the two second rollers 412 are located at both ends of the short side of the air duct 400.

[0043] Furthermore, the upper end of the air duct 400 is fixedly provided with a housing for mounting the first roller 411 and the second roller 412. Specifically, four housings are provided.

[0044] By setting the air duct 400 as an elliptical structure, when the airflow passes through the long side or the short side of the air duct 400, the airflow will flow from the side with low air pressure to the side with high air pressure through the through hole 404, so that the airflow can flow in the radial direction of the air duct 400, generating turbulence, thereby destroying the thermal boundary layer, which is beneficial to improving heat dissipation efficiency and avoiding uneven temperature inside and outside the air duct 400, resulting in local overheating.

[0045] Furthermore, the ventilation duct 400 includes a plurality of first cylindrical bodies 420 and a plurality of second cylindrical bodies 430 arranged sequentially in the vertical direction, with the first cylindrical bodies 420 and the second cylindrical bodies 430 alternating in the vertical direction. The first cylindrical bodies 420 and the second cylindrical bodies 430 are coaxially arranged and fixedly connected. The cross-sections of the first cylindrical bodies 420 and the second cylindrical bodies 430 perpendicular to their axes are both elliptical, and the diameter of the first cylindrical body 420 is larger than the diameter of the second cylindrical body 430. A plurality of air-guiding plates are respectively disposed on the outer peripheral wall surface of the first cylindrical body 420 and / or the inner peripheral wall surface of the second cylindrical body 430. Furthermore, the distances from the long side and the short side of the first cylinder 420 to the inner peripheral wall of the high-voltage winding 230 along their radial direction are both less than the distances from the long side and the short side of the first cylinder 420 to the outer peripheral wall of the low-voltage winding 220 along their radial direction; the distances from the long side and the short side of the second cylinder 430 to the inner peripheral wall of the high-voltage winding 230 along their radial direction are both greater than the distances from the long side and the short side of the second cylinder 430 to the outer peripheral wall of the low-voltage winding 220 along their radial direction.

[0046] The air duct 400 is configured as an elliptical structure with varying sizes. In the vertical direction, the airflow is described as passing from bottom to top along one long side of the first duct 420 and one long side of the second duct 430. See [link / reference] Figure 5 and Figure 6 As shown, when the airflow passes through the first cylinder 420, the distance from the long side of the first cylinder 420 to the inner peripheral wall of the high-voltage winding 230 (second air passage 402) is less than the distance from the long side of the first cylinder 420 to the outer peripheral wall of the low-voltage winding 220 (first air passage 401). Therefore, for the first air passage 401, the atmospheric pressure is low, and for the second air passage 402, the space is small and the air pressure is high. The airflow will flow from the side with low air pressure to the side with high air pressure through the through hole 404. When the airflow passes through the second cylinder 430, the distance from the long side of the second cylinder 430 to the inner peripheral wall of the high-voltage winding 230 (second air passage 402) is greater than the distance from the long side of the second cylinder 430 to the outer peripheral wall of the low-voltage winding 220 (first air passage 401). Therefore, for the first air passage 401, the space is small and the air pressure is high, while for the second air passage 402, the air pressure is low. The airflow will flow from the side with low air pressure to the side with high air pressure through the through hole 404.

[0047] In other words, in the vertical direction, when the airflow passes through the long side of the first cylinder 420 and the second cylinder 430 from bottom to top, the radial direction of the airflow when passing through the first cylinder 420 (inside to outside) is opposite to the radial direction of the airflow when passing through the second cylinder 430 (outside to inside). This causes the airflow to circulate in and out in the vertical direction in an S-shape, further improving the heat dissipation effect. Furthermore, the principle of airflow when passing through the short side of the first cylinder 420 and the second cylinder 430 from bottom to top is the same as the principle of airflow when passing through the long side of the first cylinder 420 and the second cylinder 430 from bottom to top, and will not be elaborated upon.

[0048] In another possible embodiment, a first water spraying element 440 is provided on the inner peripheral wall of the first cylinder 420, and the first water spraying element 440 is used to spray water onto the outer peripheral wall of the low-voltage winding 220; a second water spraying element 450 is provided on the outer peripheral wall of the second cylinder 430, and the second water spraying element 450 is used to spray water onto the inner peripheral wall of the high-voltage winding 230.

[0049] The first water spray component 440 includes a rotating rod and multiple water cylinders. Each water cylinder corresponds to one of the multiple first cylinder bodies 420, and the water cylinders are fixedly installed on the inner circumferential wall of their respective first cylinder bodies 420. The rotating rod, vertically oriented and rotatable around its own axis, is mounted on the air duct 400 and passes sequentially through the multiple water cylinders in a vertical direction, forming a sealed connection with each water cylinder.

[0050] The water cylinders are square tubes, each containing a piston plate 444. The piston plate 444 is square and slides in a seal with its corresponding water cylinder, dividing the interior of the water cylinder into an upper chamber and a lower chamber arranged vertically. The upper chamber is located above the lower chamber, which contains water. All piston plates 444 are helically engaged with a rotating rod, allowing the piston plates 444 to move up and down as the rotating rod rotates around its axis. A nozzle 443, a prior art design, is mounted on the water cylinder and communicates with the lower chamber.

[0051] The structure of the second water spray component 450 is the same as that of the first water spray component 440, and the water cylinder of the second water spray component 450 is installed on the outer peripheral wall of the corresponding second cylinder 430.

[0052] Specifically, the housing used to mount the first roller 411 is referred to as the first housing 405, and the rotating rod of the first water spray component 440 is rotatably mounted on the first housing 405 about its own axis. The housing used to mount the second roller 412 is referred to as the second housing 406, and the rotating rod of the second water spray component 450 is rotatably mounted on the second housing 406 about its own axis.

[0053] Furthermore, the nozzle 443 is centrally positioned on its corresponding water cylinder. The nozzle 443 communicates with the lower chamber through a first channel 445, which is located on the water cylinder. The first channel 445 communicates with the lower chamber through a connecting port 446, which is located near the inner bottom wall of the water cylinder. The water level in the lower chamber stops spraying only after it drops to near the bottom of the water cylinder, thus making full use of the water in the lower chamber.

[0054] When the transformer temperature is too high and the ambient temperature is also high, air cooling cannot provide effective heat dissipation. Therefore, water spraying can be used for cooling. Taking the first water spraying component 440 as an example, when it is necessary to spray water to cool the outer peripheral wall of the low-voltage winding 220, the rotating rod of the first water spraying component 440 rotates, causing the piston plate 444 to move down, so that water can be sprayed out through the nozzle 443 to cool the inner peripheral wall of the high-voltage winding 230. The sprayed water can also be transferred between the first air passage 401 and the second air passage 402 through the through hole 404, further improving the overall heat dissipation effect.

[0055] In a further embodiment, the rotating rod of the first water spray component 440 is referred to as the first rotating rod 441, and the rotating rod of the second water spray component 450 is referred to as the second rotating rod 451. A first transmission component 460 is provided inside the first housing 405, which drives the first rotating rod 441 to rotate around its own axis. A second transmission component is provided inside the second housing 406, which drives the second rotating rod 451 to rotate around its own axis.

[0056] The first transmission component 460 includes a first pulley 461, a first tensioning pulley 462, a first follower pulley 463, and a first transmission belt 464. The first pulley 461 is coaxially arranged and fixedly connected to the first roller 411. The first follower pulley 463 is arranged vertically and rotatably mounted inside the first housing 405. A first gear 465 is coaxially and fixedly connected to the first follower pulley 463. A first mating wheel 466 is coaxially and fixedly connected to the first rotating rod 441. The first follower pulley 463 is connected to the first rotating rod 441 through a first telescopic rod 467. The first telescopic rod 467 is arranged radially along the first rotating rod 441. The first telescopic rod 467 always has the tendency to cause the first gear 465 to move away from the first mating wheel 466 along the radial direction of the first rotating rod 441, and to keep the first gear 465 and the first mating wheel 466 away from each other in their natural state. A spring is provided inside the first telescopic rod 467. The first tensioning pulley 462 is vertically positioned and rotatably mounted within the first housing 405. It is connected to the first rotating rod 441 via a second telescopic rod 468, which is radially positioned along the first rotating rod 441. The second telescopic rod 468 always tends to move the first tensioning pulley 462 radially away from the first rotating rod 441. A spring is installed inside the second telescopic rod 468. The spring force on the first telescopic rod 467 is greater than the spring force on the second telescopic rod 468. The first transmission belt 464 is sequentially wound around the first pulley 461, the first tensioning pulley 462, and the first follower pulley 463. When the speed of the air duct 400's vertical revolution exceeds a preset value, the first gear 465 can mesh with the first mating pulley 466.

[0057] See Figure 10 As shown, under natural conditions or when the speed of the first roller 411 rotating with the entire air duct 400 in the vertical direction is less than a preset value, the first gear 465 moves away from the first mating wheel 466 under the action of the first telescopic rod 467. Assuming that when the fan 120's speed is at its maximum, the speed of the first roller 411 rotating with the entire air duct 400 in the vertical direction is greater than the preset value, then the resultant force of the centrifugal force on the first roller 411 and the elastic force of the second telescopic rod 468 is greater than the elastic force of the first telescopic rod 467. The first gear 465 will move closer to the first mating wheel 466 and mesh with it. When the fan 120 maintains its maximum speed, the first rotating rod 441 can rotate.

[0058] The second transmission component includes a second pulley 471, a second tensioning pulley 472, a second follower pulley 473, and a second transmission belt 474. The second pulley 471 is coaxially arranged and fixedly connected to the second roller 412. The second follower pulley 473 is arranged vertically and rotatably mounted inside the second housing 406. A second gear 475 is coaxially and fixedly connected to the second follower pulley 473. A second mating pulley 476 is coaxially and fixedly connected to the second rotating rod 451. The second follower pulley 473 is connected to the second rotating rod 451 through a third telescopic rod 477. The third telescopic rod 477 is arranged radially along the second rotating rod 451. The third telescopic rod 477 always has the tendency to cause the second gear 475 to move away from the second mating pulley 476 along the radial direction of the second rotating rod 451, and to keep the second gear 475 and the second mating pulley 476 away from each other in their natural state. A spring is provided inside the third telescopic rod 477.

[0059] The second tensioning wheel 472 is vertically positioned and rotatably mounted within the second housing 406. It is connected to the second rotating rod 451 via a fourth telescopic rod 478, which is radially positioned along the second rotating rod 451. The fourth telescopic rod 478 always tends to cause the second tensioning wheel 472 to move radially away from the second rotating rod 451. A spring is installed inside the fourth telescopic rod 478. The spring force on the third telescopic rod 477 is greater than the spring force on the fourth telescopic rod 478. Furthermore, when the speed of the air duct 400's revolution around the vertical direction exceeds a preset value, the second gear 475 can mesh with the second mating wheel 476.

[0060] See Figure 11 As shown, under natural conditions or when the speed of the second roller 412 rotating with the entire air duct 400 in the vertical direction is less than a preset value, the second gear 475 moves away from the second mating wheel 476 under the action of the third telescopic rod 477. Assuming that when the fan 120's speed is at its maximum, the speed of the first roller 411 rotating with the entire air duct 400 in the vertical direction is greater than the preset value, then the resultant force of the centrifugal force on the second tension wheel 472 and the elastic force of the fourth telescopic rod 478 is greater than the elastic force of the third telescopic rod 477. The second gear 475 will move closer to the second mating wheel 476 and mesh with it. When the fan 120 maintains its maximum speed, the second rotating rod 451 can rotate.

[0061] In another possible embodiment, the water tube of the first water spray component 440 is referred to as the first water tube 442, and the water tube of the second water spray component 450 is referred to as the second water tube 452. Both the first rotating rod 441 and the second rotating rod 451 are hollow rods and are connected to an external water pipe. A water valve 480 is provided at the connection between the water pipe and the first rotating rod 441 and the second rotating rod 451.

[0062] Both the first rotating rod 441 and the second rotating rod 451 are provided with multiple water inlet holes 447. The multiple water inlet holes 447 on the first rotating rod 441 are arranged one-to-one with multiple first water cylinders 442, and are located in the lower cavity of the corresponding first water cylinder 442, close to the inner bottom wall of the first water cylinder 442. The multiple water inlet holes 447 on the second rotating rod 451 are arranged one-to-one with multiple second water cylinders 452, and are located in the lower cavity of the corresponding second water cylinder 452, close to the inner bottom wall of the second water cylinder 452.

[0063] Furthermore, a turntable 448 is provided on both the first rotating rod 441 and the second rotating rod 451.

[0064] As the water levels in the first water tank 442 and the second water tank 452 gradually decrease, when water needs to be replenished in the first water tank 442 and the second water tank 452, the blower 120 is stopped, and then the turntable 448 is manually rotated, causing the first rotating rod 441 and the second rotating rod 451 to rotate, thereby causing the piston plates 444 in the first water tank 442 and the second water tank 452 to rotate upwards and reset. Then, the first rotating rod 441 and the second rotating rod 451 are respectively connected to external water pipes, and the water valve 480 is opened to allow water to enter the first water tank 442 and the second water tank 452 to replenish water.

[0065] The working process is as follows: When the transformer is in use, the fan 120 is started, and the fan 120 sends air into the first air duct 401 and the second air duct 402. When the air passes through the first air duct 401, it can cool the low-voltage winding 220. When the air passes through the second air duct 402, it can cool the high-voltage winding 230. While using air cooling, the fan duct 400 is driven to rotate synchronously through the air duct 403. The inner cleaning roller 410 cleans the outer peripheral wall of the low-voltage winding 220, and the outer cleaning roller 410 cleans the inner peripheral wall of the high-voltage winding 230. This prevents dust from adhering to the surface of the low-voltage winding 220 and the high-voltage winding 230, improves the heat dissipation effect, and extends the service life of the transformer.

[0066] Furthermore, when the airflow passes through the long side or the short side of the duct 400, the airflow will flow from the side with low air pressure to the side with high air pressure through the through hole 404, allowing the airflow to flow in the radial direction of the duct 400, generating turbulence, which in turn destroys the thermal boundary layer, which is beneficial to improving heat dissipation efficiency and avoiding uneven temperature inside and outside the duct 400, resulting in local overheating.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-noise dry-type distribution transformer, characterized in that: It includes a support and multiple transformer bodies, with a noise reduction mechanism installed on the support; multiple transformer bodies are arranged sequentially in the horizontal direction on the support, and the upper and lower ends of the multiple transformer bodies are connected by brackets respectively; the transformer body includes an iron core, a low-voltage winding and a high-voltage winding; the axis of the iron core is arranged in the vertical direction, and the low-voltage winding and the high-voltage winding are both coaxial with the iron core and are sequentially sleeved on the iron core, with the low-voltage winding located on the side of the high-voltage winding in the horizontal direction closer to the vertical central axis of the iron core; A duct is coaxially mounted between the low-voltage winding and the high-voltage winding. The duct is rotatably mounted on a support, forming a first air passage between the duct and the low-voltage winding, and a second air passage between the duct and the high-voltage winding. A fan is mounted on the lower support, which, when activated, supplies air into the first and second air passages. Cleaning rollers are rotatably mounted on the inner and outer sides of the duct. The inner cleaning roller is always in contact with the outer peripheral wall of the low-voltage winding, and the outer cleaning roller is always in contact with the inner peripheral wall of the high-voltage winding. The duct includes multiple first cylinders and multiple second cylinders arranged vertically in a staggered pattern. The first and second cylinders are coaxially mounted and fixedly connected. A first water spray element is mounted on the inner peripheral wall of the first cylinder, and a second water spray element is mounted on the outer peripheral wall of the second cylinder. The first water spray element includes a rotating rod. The system comprises multiple water cylinders, each corresponding to a first cylinder body, with the water cylinders mounted on the inner circumferential wall of their respective first cylinder bodies. A rotating rod, vertically oriented and capable of rotating around its own axis, is mounted on either a first or second cylinder body. The rotating rod passes through multiple water cylinders sequentially along the vertical direction and is sealed to them. Each water cylinder contains a piston plate, which slides and seals with its corresponding water cylinder, dividing the interior of the water cylinder into an upper chamber and a lower chamber arranged vertically in sequence. The upper chamber is located above the lower chamber, which contains water. Multiple piston plates are helically engaged with the rotating rod, and the piston plates can move up and down when the rotating rod rotates around its own axis. A nozzle is mounted on each water cylinder, and the nozzle communicates with the lower chamber. The structure of the second water spray component is the same as that of the first water spray component, and the water cylinder of the second water spray component is mounted on the outer circumferential wall of its corresponding second cylinder body.

2. The low-noise dry-type distribution transformer according to claim 1, characterized in that: The ventilation duct is equipped with multiple air-guiding vanes, all of which are tilted.

3. A low-noise dry-type distribution transformer according to claim 1, characterized in that: The air duct has multiple through holes. The cross-section of the air duct perpendicular to its axis is elliptical. The cleaning rollers on the inner and outer sides of the air duct are referred to as the first roller and the second roller, respectively. The first roller is located on the long side of the air duct, between the outer peripheral wall of the air duct and the inner peripheral wall of the high voltage winding, and abuts against the inner peripheral wall of the high voltage winding. The second roller is located on the short side of the air duct, between the inner peripheral wall of the air duct and the outer peripheral wall of the low voltage winding, and abuts against the outer peripheral wall of the low voltage winding.

4. A low-noise dry-type distribution transformer according to claim 3, characterized in that: The cross-sections of the first and second cylinders perpendicular to their axes are both elliptical. The diameter of the first cylinder is larger than that of the second cylinder. The distances from the long side and the short side of the first cylinder to the inner peripheral wall of the high-voltage winding along its radial direction are both smaller than the distances from the long side and the short side of the first cylinder to the outer peripheral wall of the low-voltage winding along its radial direction. The distances from the long side and the short side of the second cylinder to the inner peripheral wall of the high-voltage winding along its radial direction are both greater than the distances from the long side and the short side of the second cylinder to the outer peripheral wall of the low-voltage winding along its radial direction.

5. A low-noise dry-type distribution transformer according to claim 4, characterized in that: The upper end of the first or second cylinder is provided with a housing for mounting the first roller and the second roller. The housing for mounting the first roller is referred to as the first housing, and the housing for mounting the second roller is referred to as the second housing. The rotating rod of the first water spray component is referred to as the first rotating rod, and the rotating rod of the second water spray component is referred to as the second rotating rod. A first transmission component is provided inside the first housing, which is used to drive the first rotating rod to rotate around its own axis. A second transmission component is provided inside the second housing, which is used to drive the second rotating rod to rotate around its own axis.

6. A low-noise dry-type distribution transformer according to claim 5, characterized in that: The water cylinder of the first water spray component is referred to as the first water cylinder, and the water cylinder of the second water spray component is referred to as the second water cylinder. Both the first rotating rod and the second rotating rod are hollow rods and are connected to an external water pipe. Both the first rotating rod and the second rotating rod are provided with multiple water inlet holes. The multiple water inlet holes on the first rotating rod are arranged one-to-one with the multiple first water cylinders and are located in the lower cavity of the corresponding first water cylinder. The multiple water inlet holes on the second rotating rod are arranged one-to-one with the multiple second water cylinders and are located in the lower cavity of the corresponding second water cylinders.

7. A low-noise dry-type distribution transformer according to claim 5, characterized in that: A turntable is fixedly installed on both the first and second rotating rods.

8. A low-noise dry-type distribution transformer according to claim 1, characterized in that: The noise reduction mechanism is a shock-absorbing spring.

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