Vacuum-assisted transformer impregnation apparatus and impregnation process

Abstract

The application discloses a kind of vacuum auxiliary-based transformer impregnation equipment and impregnation process, it is related to transformer impregnation technical field, it aims at solving the problem that insulating paint is difficult to completely penetrate inside coil in conventional environment in traditional transformer impregnation process, including impregnation tank, the outer wall of the impregnation tank is fixedly connected with fixing frame, the inner wall of the upper side of the fixing frame is hinged with connecting frame, the other end of the connecting frame is fixedly connected with tank cover, the top of the tank cover is fixedly connected with vacuum pump, the air inlet pipe of the vacuum pump is communicated with the inside of the tank cover and the impregnation tank, the bottom of the impregnation tank is fixedly connected with a plurality of evenly arranged bases, the bottom of the impregnation tank is fixedly connected with motor, the inside of the impregnation tank is provided with transmission shaft, and the transmission shaft and the impregnation tank are the same center.The present application has the advantages of greatly reducing the probability of existence of bubbles and voids in the process of transformer impregnation.

Description

Technical Field

[0001] This invention relates to the field of transformer impregnation technology, and more specifically, to a vacuum-assisted transformer impregnation device and impregnation process. Background Technology

[0002] Transformers occupy a crucial position among the core components of power systems and electronic equipment. Their performance directly affects the stability and reliability of the entire system. Insulation performance and heat dissipation are two key indicators of transformer operation, which largely depend on the quality of the coil impregnation process.

[0003] In traditional transformer impregnation processes, the insulating varnish struggles to fully penetrate the complex porous structure of the coil under normal conditions, inevitably resulting in air bubbles and voids within the coil. These bubbles and voids not only disrupt the continuity of the insulation layer, making the transformer prone to partial discharge during high-voltage operation, thus reducing insulation performance and increasing the risk of breakdown, but they also hinder heat conduction, severely impacting heat dissipation, leading to increased coil temperature, accelerated aging of the insulation material, and a shortened transformer lifespan. Therefore, we propose a vacuum-assisted transformer impregnation device and process. Summary of the Invention

[0004] The purpose of this invention is to provide a vacuum-assisted transformer impregnation device and impregnation process, which aims to solve the problem that the insulating varnish is difficult to completely penetrate into the coil under normal conditions during the traditional transformer impregnation process.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a vacuum-assisted transformer impregnation device, comprising an impregnation tank, a fixed frame fixedly connected to the outer wall of the impregnation tank, a connecting frame hinged to the inner wall of the upper side of the fixed frame, a tank cover fixedly connected to the other end of the connecting frame, a vacuum pump fixedly connected to the top of the tank cover, an air inlet pipe of the vacuum pump penetrating the tank cover and communicating with the interior of the impregnation tank, a plurality of evenly arranged bases fixedly connected to the bottom of the impregnation tank, a motor fixedly connected to the bottom of the impregnation tank, a drive shaft provided inside the impregnation tank, the drive shaft and the impregnation tank being concentric, the main shaft of the motor penetrating the bottom of the impregnation tank to its interior and being fixedly connected to the bottom of the drive shaft, and a support mechanism for supporting the transformer provided on the inner wall of the impregnation tank.

[0006] Preferably, the supporting mechanism includes a support ring fixedly connected to the outer wall of the drive shaft. The interior of the impregnation tank is provided with multiple support plates. A dividing tube is provided at the top of each support plate, penetrating the support plate. The support plates are arranged sequentially inside the impregnation tank, and the drive shaft passes sequentially through the dividing tubes. The support ring supports the bottom of the lowest dividing tube. The dividing tubes support each other sequentially from bottom to top. The inner walls of each dividing tube extend to form multiple protruding engaging portions. The outer walls of each drive shaft are recessed inward to form multiple engaging grooves corresponding to the engaging portions. Multiple placement grooves are evenly provided on the top of each support plate.

[0007] Preferably, the inner wall of the placement groove is fixedly connected with a plurality of evenly arranged placement plates, and baffles are fixedly connected to the four corners of the placement groove.

[0008] Preferably, the bottom of each support plate is rotatably connected to a limiting ring, the outer wall of each limiting ring is provided with multiple limiting grooves, the inner wall of the impregnation tank is fixedly connected with multiple limiting strips corresponding to the limiting grooves, the top of each limiting ring is fixedly connected with multiple connecting rings, the top of each connecting ring is fixedly connected with a pushing member, the bottom of the support plate is provided with multiple movable grooves corresponding to the connecting rings, and the movable grooves are in communication with the interior of the placement groove.

[0009] Preferably, the top of the pushing member is bent to form a pushing portion, the pushing portion is a semi-circular structure, and the pushing members on two adjacent connecting rings are arranged in an alternating manner.

[0010] Preferably, the upper outer wall of the impregnation tank is fixedly connected with a plurality of U-shaped fasteners, the top of the impregnation tank is provided with a fixing ring, the inner surface of the fasteners contacts the top and bottom of the fixing ring respectively, the inner wall of the fixing ring is fixedly connected with a plurality of evenly arranged ring teeth, and the outer wall of the tank lid is fixedly connected with a plurality of evenly arranged lid teeth, the lid teeth and the ring teeth being interlaced.

[0011] A vacuum-assisted transformer impregnation process, wherein the impregnation process employs any of the vacuum-assisted transformer impregnation devices described above, and the impregnation process includes the following steps:

[0012] S1. Clean the transformer to remove surface oil, dust and oxide layer;

[0013] S2. Place the transformers in the placement slots in sequence, and then place the support plate and the limiting slot into the impregnation tank in sequence. During this process, the limiting slot and the limiting strip need to be aligned, and the engaging parts need to be aligned with the engaging slot.

[0014] S3. Then close the can lid and rotate the retaining ring to fix the can lid in place.

[0015] S4. Start the vacuum pump and motor to make the vacuum pump extract the air from the impregnation tank, making its interior a vacuum and increasing the impregnation effect. The motor will cause the transformer to tilt and reset continuously, increasing the contact effect between the transformer and the insulating varnish in the impregnation tank, further increasing the impregnation effect.

[0016] S5. After impregnation is completed, open the can lid, remove the transformer, and heat and dry the transformer to complete the impregnation process.

[0017] Preferably, step S1 above further includes heating the cleaned transformer to 50-80°C to remove internal moisture.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention, by setting up an impregnation tank, a fixed frame, a connecting frame, a tank cover, a vacuum pump, a base, a motor, a transmission shaft, and a support mechanism, enables the vacuum pump to extract air from the impregnation tank to create a vacuum environment. The pressure difference forces the insulating varnish to penetrate into the coil. At the same time, the motor drives the transmission shaft to rotate, causing the transformer on the support mechanism to rotate and come into contact with the insulating varnish. Under this dual action, the probability of the presence of air bubbles and voids is greatly reduced.

[0020] 2. The engagement design of the support ring and the dividing tube in the support mechanism of this invention enables the multi-layer support plate to rotate synchronously when the drive shaft rotates. The transformer in the placement slot rotates with the support plate, and at the same time, it creates a turbulent flow field for the insulating varnish in the impregnation tank. The cooperation between the limiting ring and the limiting strip on the inner wall of the impregnation tank allows the pushing member to periodically extend into the placement slot at a fixed position. The pushing member pushes the bottom of the transformer, causing it to tilt regularly during rotation. This composite motion mode of "rotation + tilting + varnish turbulence" allows each surface of the transformer to fully contact the insulating varnish.

[0021] 3. The semi-circular pushing part formed at the top of the pushing member in this invention guides the pushing member when it enters the placement groove to push the transformer, preventing the pushing member and the transformer from getting stuck together. The pushing members on the two adjacent connecting rings are arranged in an alternating manner, which allows the pushing members to push from both sides of the bottom of the transformer, causing the transformer to tilt back and forth to both sides. The baffle can also block the other side when the transformer tilts, thereby preventing the transformer from tipping over and further increasing the impregnation effect of the transformer. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the immersion tank in this invention;

[0024] Figure 3 A schematic diagram of the disassembly structure of the support plate in this invention;

[0025] Figure 4 This is a schematic diagram of the disassembly structure of the limiting ring in this invention;

[0026] Figure 5 for Figure 2 A magnified view of section A in the image.

[0027] In the picture:

[0028] 1. Impregnation tank; 2. Fixing frame; 3. Connecting frame; 4. Tank lid; 5. Vacuum pump; 6. Base; 7. Motor; 8. Drive shaft; 9. Support ring; 10. Support plate; 11. Dividing tube; 12. Engaging part; 13. Engaging groove; 14. Placement groove; 15. Placement plate; 16. Baffle; 17. Limiting ring; 18. Limiting groove; 19. Limiting strip; 20. Connecting ring; 21. Pushing part; 22. Movable groove; 23. Pushing part; 24. Fixing part; 25. Fixing ring; 26. Ring tooth; 27. Cover tooth. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Example 1

[0031] like Figure 1-5 As shown, a vacuum-assisted transformer impregnation device includes an impregnation tank 1. A fixing frame 2 is fixedly connected to the outer wall of the impregnation tank 1. A connecting frame 3 is hinged to the inner wall of the upper side of the fixing frame 2. A tank cover 4 is fixedly connected to the other end of the connecting frame 3. A vacuum pump 5 is fixedly connected to the top of the tank cover 4. The air inlet pipe of the vacuum pump 5 passes through the tank cover 4 and communicates with the interior of the impregnation tank 1. A plurality of evenly arranged bases 6 are fixedly connected to the bottom of the impregnation tank 1. A motor 7 is fixedly connected to the bottom of the impregnation tank 1. A drive shaft 8 is provided inside the impregnation tank 1. The drive shaft 8 and the impregnation tank 1 are at the same center. The main shaft of the motor 7 passes through the bottom of the impregnation tank 1 to its interior and is fixedly connected to the bottom of the drive shaft 8. A support mechanism for supporting the transformer is provided on the inner wall of the impregnation tank 1.

[0032] Specifically, the transformer is supported by a support mechanism, which is then placed into the impregnation tank 1. The tank cover 4 is then closed. Subsequently, the motor 7 and vacuum pump 5 are started, causing the vacuum pump 5 to extract the air from the impregnation tank 1, creating a vacuum. This increases the contact effect between the insulating varnish in the impregnation tank 1 and the transformer. At the same time, the operation of the motor 7 drives the support mechanism to rotate, which in turn causes the transformer to rotate and agitates the insulating varnish in the impregnation tank 1. This further increases the contact effect between the transformer and the insulating varnish, promoting the penetration of the insulating varnish into the transformer coil. This reduces the probability of air bubbles and voids between the transformer coil and the insulating varnish, thereby increasing the impregnation effect on the transformer.

[0033] Furthermore, the supporting mechanism includes a support ring 9 fixedly connected to the outer wall of the drive shaft 8. The interior of the impregnation tank 1 is provided with multiple support plates 10. The top of the support plate 10 is provided with a dividing tube 11, which passes through the support plate 10. The support plates 10 are arranged sequentially inside the impregnation tank 1, and the drive shaft 8 passes through the dividing tube 11 sequentially. The support ring 9 supports the bottom of the lowest dividing tube 11. The dividing tubes 11 support each other sequentially from bottom to top. The inner wall of each dividing tube 11 extends to form multiple protruding engaging parts 12. The outer wall of each drive shaft 8 is recessed inward to form multiple engaging grooves 13 corresponding to the engaging parts 12. The top of the support plate 10 is evenly provided with multiple placement grooves 14.

[0034] Specifically, the placement slot 14 on the support plate 10 is used to place the transformer. The bottom of the lowest dividing tube 11 is supported by the support ring 9. Since the dividing tube 11 is fixedly connected to the support plate 10, the drive shaft 8 supports the support plate 10 inside the impregnation tank 1 through the support ring 9 and the dividing tube 11. The dividing tubes 11 support each other from bottom to top, thereby supporting the support plate 10 on the inner wall of the impregnation tank 1. When the motor 7 runs, it drives the drive shaft 8 to rotate. The rotation of the drive shaft 8 drives the dividing tube 11 to rotate through the engaging part 12 and engaging groove 13, thereby causing the dividing tube 11 to drive the support plate 10 to rotate. In this way, the rotation of the support plate 10 drives the transformer in the placement slot 14 to rotate.

[0035] Furthermore, multiple evenly arranged placement plates 15 are fixedly connected to the inner wall of the placement groove 14, and baffles 16 are fixedly connected to the four corners of the placement groove 14.

[0036] Specifically, the transformer is supported by multiple placement plates 15, thereby reducing the support area of ​​the transformer, increasing the contact effect between the transformer and the insulating varnish, and further increasing the impregnation effect of the transformer. Meanwhile, the baffle 16 blocks the transformer, thereby increasing the stability of the transformer when it rotates.

[0037] Furthermore, the bottom of the support plate 10 is rotatably connected to a limiting ring 17, and the outer wall of the limiting ring 17 is provided with multiple limiting grooves 18. The inner wall of the immersion tank 1 is fixedly connected with multiple limiting strips 19 corresponding to the limiting grooves 18. The top of the limiting ring 17 is fixedly connected with multiple connecting rings 20, and the top of each connecting ring 20 is fixedly connected with a pushing member 21. The bottom of the support plate 10 is provided with multiple movable grooves 22 corresponding to the connecting rings 20, and the movable grooves 22 communicate with the interior of the placement groove 14.

[0038] Specifically, the limiting groove 18 is aligned with the limiting strip 19, and the limiting strip 19 limits the limiting ring 17 through the limiting groove 18, preventing the limiting ring 17 from rotating. Since the limiting ring 17 is rotatably connected to the support plate 10, it will not affect the normal rotation of the support plate 10. The connecting ring 20 on the limiting ring 17 is fixed to the limiting ring 17, and the pushing member 21 is fixed to the connecting ring 20, so the pushing member 21 will not move. When the support plate 10 rotates and drives the transformer to rotate, the pushing member 21 will circulate through the movable groove 22 to enter and exit the placement groove 14. When the pushing member 21 enters the placement groove 14, the top of the pushing member 21 will push the bottom of the transformer, thereby tilting the transformer. This process is repeated to increase the contact area and effect between the transformer and the insulating varnish, further enhancing the impregnation effect on the transformer.

[0039] Furthermore, the top of the pusher 21 is bent to form a pusher portion 23, which has a semi-circular structure, and the pushers 21 on two adjacent connecting rings 20 are arranged in an alternating manner.

[0040] Specifically, the semi-circular pushing part 23 formed at the top of the pushing member 21 guides the pushing member 21 when it enters the placement groove 14 to push the transformer, preventing the pushing member 21 from getting stuck with the transformer. The pushing members 21 on the two adjacent connecting rings 20 are arranged in an alternating manner, which allows the pushing members 21 to push from both sides of the bottom of the transformer, causing the transformer to tilt back and forth to both sides. The baffle 16 can block the other side when the transformer tilts, thereby preventing the transformer from tipping over and further increasing the impregnation effect of the transformer.

[0041] Furthermore, a plurality of U-shaped fasteners 24 are fixedly connected to the upper outer wall of the impregnation tank 1, and a fixing ring 25 is provided on the top of the impregnation tank 1. The inner surface of the fasteners 24 contacts the top and bottom of the fixing ring 25 respectively. A plurality of evenly arranged ring teeth 26 are fixedly connected to the inner wall of the fixing ring 25, and a plurality of evenly arranged cover teeth 27 are fixedly connected to the outer wall of the tank lid 4. The cover teeth 27 and the ring teeth 26 are interleaved with each other.

[0042] Specifically, because the fixing member 24 limits the fixing ring 25, the fixing ring 25 can rotate but cannot detach from the fixing member 24. Therefore, after the can cover 4 is closed, by rotating the fixing ring 25, the ring teeth 26 and the cover teeth 27 come into contact with each other and block each other, so that the can cover 4 cannot be opened, thereby increasing the stability of the transformer during impregnation.

[0043] A vacuum-assisted transformer impregnation process, wherein the impregnation process employs any of the aforementioned vacuum-assisted transformer impregnation devices, and the impregnation process includes the following steps:

[0044] S1. Clean the transformer to remove surface oil, dust and oxide layer;

[0045] S2. Place the transformer in the placement slot 14 in sequence, and then place the support plate 10 and the limiting slot 18 into the impregnation tank 1 in sequence. During this process, the limiting slot 18 and the limiting strip 19 need to be aligned, and the locking part needs to be aligned with the locking slot 13.

[0046] S3. Then close the can lid 4 and rotate the retaining ring 25 to fix the can lid 4 in place.

[0047] S4. Start the vacuum pump 5 and motor 7 to make the vacuum pump 5 extract the air from the impregnation tank 1, making its interior a vacuum and increasing the impregnation effect. The operation of motor 7 will cause the transformer to tilt and reset continuously, increasing the contact effect between the transformer and the insulating varnish in the impregnation tank 1, further increasing the impregnation effect.

[0048] S5. After impregnation is completed, open the can lid 4, take out the transformer, and heat and dry the transformer to complete the impregnation process.

[0049] Furthermore, in step S1 above, the cleaned transformer is heated to 50-80°C to remove internal moisture.

[0050] Working Principle: This embodiment provides a vacuum-assisted transformer impregnation device and impregnation process. A transformer is supported by a support mechanism, which is then placed into an impregnation tank 1. The tank cover 4 is then closed. The motor 7 and vacuum pump 5 are then activated, causing the vacuum pump 5 to extract air from the impregnation tank 1, creating a vacuum. This increases the contact between the insulating varnish in the impregnation tank 1 and the transformer. Simultaneously, the motor 7 rotates the support mechanism, which in turn rotates the transformer and agitates the insulating varnish in the impregnation tank 1, further increasing the contact between the transformer and the insulating varnish. This promotes the penetration of the insulating varnish into the transformer coils, reducing the probability of air bubbles and voids between the transformer coils and the insulating varnish, thereby enhancing the impregnation effect on the transformer.

[0051] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A vacuum-assisted transformer impregnation device, characterized in that, The device includes an impregnation tank (1), a fixed frame (2) is fixedly connected to the outer wall of the impregnation tank (1), a connecting frame (3) is hinged to the inner wall of the upper side of the fixed frame (2), a tank cover (4) is fixedly connected to the other end of the connecting frame (3), a vacuum pump (5) is fixedly connected to the top of the tank cover (4), the air inlet pipe of the vacuum pump (5) passes through the tank cover (4) and communicates with the interior of the impregnation tank (1), a plurality of evenly arranged bases (6) are fixedly connected to the bottom of the impregnation tank (1), a motor (7) is fixedly connected to the bottom of the impregnation tank (1), a transmission shaft (8) is provided inside the impregnation tank (1), the transmission shaft (8) and the impregnation tank (1) are at the same center, the main shaft of the motor (7) passes through the bottom of the impregnation tank (1) to its interior and is fixedly connected to the bottom of the transmission shaft (8), and a support mechanism for supporting the transformer is provided on the inner wall of the impregnation tank (1). The impregnation tank (1) is provided with multiple support plates (10) inside. Multiple placement slots (14) are evenly opened on the top of the support plates (10). The bottom of each support plate (10) is rotatably connected to a limiting ring (17). Multiple limiting slots (18) are opened on the outer wall of each limiting ring (17). Multiple limiting strips (19) corresponding to the limiting slots (18) are fixedly connected to the inner wall of the impregnation tank (1). Multiple connecting rings (20) are fixedly connected to the top of each limiting ring (20). Pushing members (21) are fixedly connected to the top of each connecting ring (20). Multiple movable slots (22) corresponding to the connecting rings (20) are opened on the bottom of the support plate (10). The movable slots (22) are connected to the interior of the placement slots (14). The top of the pusher (21) is bent to form a pusher portion (23), which is a semi-circular structure, and the pushers (21) on two adjacent connecting rings (20) are arranged in an alternating manner.

2. The transformer impregnation device based on vacuum assistance according to claim 1, characterized in that, The supporting mechanism includes a support ring (9) fixedly connected to the outer wall of the drive shaft (8). A dividing tube (11) is provided on the top of the support plate (10). The dividing tube (11) passes through the support plate (10). The support plates (10) are arranged in sequence inside the impregnation tank (1). The drive shaft (8) passes through the dividing tube (11) in sequence. The support ring (9) supports the bottom of the lowest dividing tube (11). The dividing tubes (11) support each other in sequence from bottom to top. The inner wall of each dividing tube (11) extends to form multiple protruding engaging parts (12). The outer wall of each drive shaft (8) is recessed inward to form multiple engaging grooves (13) corresponding to the engaging parts (12).

3. The transformer impregnation device based on vacuum assistance according to claim 2, characterized in that, The inner wall of the placement groove (14) is fixedly connected with a plurality of uniformly arranged placement plates (15), and baffles (16) are fixedly connected at the four corners of the placement groove (14).

4. The transformer impregnation device based on vacuum assistance according to claim 3, characterized in that, The upper outer wall of the impregnation tank (1) is fixedly connected with a plurality of U-shaped fasteners (24), and a fixing ring (25) is provided on the top of the impregnation tank (1). The inner surface of the fastener (24) contacts the top and bottom of the fixing ring (25) respectively. The inner wall of the fixing ring (25) is fixedly connected with a plurality of evenly arranged ring teeth (26), and the outer wall of the tank cover (4) is fixedly connected with a plurality of evenly arranged cover teeth (27). The cover teeth (27) and the ring teeth (26) are interlaced.

5. A vacuum-assisted transformer impregnation process, wherein the impregnation process employs the vacuum-assisted transformer impregnation equipment described in claim 4, characterized in that, The impregnation process includes the following steps: S1. Clean the transformer to remove surface oil, dust and oxide layer; S2. Place the transformer in the placement slot (14) in sequence, and then place the support plate (10) and the limiting slot (18) in the impregnation tank (1) in sequence. During this process, the limiting slot (18) needs to be aligned with the limiting strip (19), and the engaging part needs to be aligned with the engaging slot (13). S3. Then close the can lid (4) and rotate the fixing ring (25) to fix the can lid (4). S4. Start the vacuum pump (5) and motor (7) to run, so that the vacuum pump (5) will extract the air in the impregnation tank (1) to make its interior vacuum, thereby increasing the impregnation effect. The operation of the motor (7) will cause the transformer to tilt and reset continuously, thereby increasing the contact effect between the transformer and the insulating varnish in the impregnation tank (1), and further increasing the impregnation effect. S5. After impregnation is completed, open the can lid (4) to take out the transformer and heat and dry the transformer to complete the impregnation process of the transformer.

6. The transformer impregnation process based on vacuum assistance according to claim 5, characterized in that, Step S1 also includes heating the cleaned transformer to 50-80°C to remove internal moisture.

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