An oil-immersed transformer oil tank and a transformer thereof

Abstract

This invention discloses an oil-immersed transformer tank and its transformer, relating to the field of transformer technology. The tank includes: a housing filled with insulating oil; a fixed cylinder fixed to the top of the housing; an inner column rotatably disposed within the fixed cylinder, the bottom of which has a vertical groove, and the top of which has an external groove communicating with the lower half of the vertical groove, allowing the vertical groove to be connected to or separated from the housing by the rotation of the inner column; a slot plate slidably disposed in the lower half of the vertical groove; a pressure box fixed to the top of the vertical groove, with an inner rod slidably disposed inside the pressure box, the bottom end of which connects to the slot plate; and an elastic sleeve disposed within the external groove, the inner cavity of which communicates with the pressure box. This oil-immersed transformer tank and its transformer, through the elastic sleeve structure within the external groove, combined with its axially alternating thick and thin wall design, expand upon inflation during oil-gas impact, providing elastic support and damping buffer for the slot plate, effectively weakening the instantaneous airflow impact force during the initial stage of pressure relief and preventing direct injection of high-pressure airflow.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to an oil-immersed transformer tank and the transformer thereof. Background Technology

[0002] When a transformer experiences internal short circuits, localized overheating, or other faults, the losses in the core and winding components are rapidly converted into heat, causing the insulating oil to heat up quickly and vaporize in large quantities. This leads to a rapid increase in internal pressure in the tank. If the pressure is not released in time, it can easily cause the tank to deform, crack, or even explode. Currently, pressure relief valves are commonly used for pressure relief. When the internal pressure reaches a set value, the valve opens to release the oil and gas. However, the initial pressure during the pressure relief phase is extremely high, and the airflow has a strong impact. Due to the lack of a buffer structure, the high-pressure oil and gas are directly ejected outward, generating intense noise with a sound level of 110-130 dB(A). The sound is wide-spectrum, highly sudden, and subjectively perceived by the human ear as a "cracking sound" or "explosion." This is especially problematic in noise-sensitive areas such as residential areas, schools, and hospitals, where it has a significant impact on the surrounding population. It also causes the entire tank to vibrate, leading to loosening of the tank welds, decreased sealing performance, and even cracks and oil leaks in the tank shell, seriously affecting the structural integrity and service life of the tank.

[0003] Therefore, it is necessary to propose an oil-immersed transformer tank and its transformer to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an oil-immersed transformer tank and its transformer to solve the problem of high-pressure oil and gas being directly ejected outwards and generating severe noise due to the lack of a buffer structure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an oil-immersed transformer tank, comprising:

[0006] The enclosure is filled with insulating oil. A fixing cylinder is used to secure the top of the enclosure. The inner column is rotatably installed inside the fixed cylinder. The bottom of the inner column is provided with a vertical groove, and the top is provided with an external groove that communicates with the lower half of the vertical groove. The vertical groove can be connected or separated from the box body by rotating the inner column. The groove plate is slidably installed in the lower half of the vertical groove; The pressure box is fixed at the top of the vertical groove. An inner rod is slidably provided inside the pressure box, and the bottom end of the inner rod is connected to the groove plate. The elastic sleeve is located in the external groove. The inner cavity of the elastic sleeve is connected to the pressure box, and the thickness of the inner ring wall is distributed alternately along the axial direction. After inflation, it forms a deformable protrusion with alternating density along the axial direction. During exhaust, the oil and gas lifting trough plate compresses the pressure box, and the gas inside the pressure box enters the inner cavity of the elastic sleeve, causing it to expand and providing elastic support and damping buffer for the trough plate. At the same time, the deformation protrusions generate stepped damping and blocking of the oil and gas discharged through the vertical trough and the external connecting trough, dissipating kinetic energy and reducing noise.

[0007] Preferably, the side of the groove plate is provided with a sliding rod, and an arc-shaped slide is formed between the outer wall of the inner column and the inner wall of the fixed cylinder. The arc-shaped slide is distributed correspondingly to the upper half of the inner column. The upper half of the side wall of the vertical groove is provided with a side groove, and the vertical groove is connected to the arc-shaped slide through the side groove. When the trough plate moves to its highest position, the slide rod extends through the side groove and enters the arc-shaped slide to limit the axial movement of the trough plate, maintaining the oil and gas passage area and the expansion state of the elastic sleeve.

[0008] Preferably, a guide block is provided inside the arc-shaped slide. The guide block is arc-shaped, the outer arc surface of the guide block is fixedly connected to the inner wall of the fixed cylinder, the inner arc surface of the guide block is attached to the outer wall of the inner column, and the slide rod abuts against the guide block. After the exhaust is completed, the guide block and the inner column rotate synchronously to squeeze the slide bar and retract, and the groove plate is reset.

[0009] Preferably, the lower surface of the groove plate is inclined, and the side closer to the external groove is inclined upward.

[0010] Preferably, a cone is rotatably provided at the bottom of the groove plate, with the tip of the cone inclined towards the outer groove direction; A blade is fixedly installed on the side of the cone.

[0011] Preferably, the bottom of the fixed cylinder is provided with a cylinder hole, and the cylinder hole extends downward through the top of the box body. When the vertical groove is connected to the cylinder hole, the oil and gas are discharged outward from the cylinder hole, the vertical groove and the external groove. The inner diameter of the cylinder hole is larger than the inner diameter of the vertical groove.

[0012] Preferably, a first spring is provided inside the pressure box, and the first spring is connected between the top of the pressure box and the top of the inner rod.

[0013] Preferably, a drive mechanism is provided on the outside of the inner column. The drive mechanism includes an arc-shaped toothed plate, a motor and a gear. The arc-shaped toothed plate is fixedly connected to the outer wall of the inner column, the motor is fixedly installed on the outer wall of the fixed cylinder, and the gear is fixedly connected to the drive shaft of the motor. The arc-shaped toothed plate is meshed with the gear.

[0014] Preferably, a retaining ring is fixedly connected to the top of the groove plate, the outer wall of the retaining ring is slidably fitted with the inner wall of the vertical groove, and the height of the retaining ring is greater than the height of the part where the outer groove connects with the vertical groove.

[0015] The present invention also discloses a transformer that uses the above-mentioned oil-immersed transformer tank to dissipate the kinetic energy of oil and gas while reducing airflow turbulence noise, thereby avoiding disturbance to residents in noise-sensitive areas such as residential areas and schools.

[0016] The technical effects and advantages of this invention are as follows: 1. Elastic sleeve with flexible cushioning and stepped noise reduction weakens instantaneous impact and reduces the risk of disturbing neighbors: This invention utilizes an elastic sleeve structure within the external groove, combined with its axially alternating thick and thin wall design. On one hand, during oil and gas impact, the expansion provides elastic support and damping buffer for the groove plate, effectively weakening the instantaneous airflow impact force in the initial stage of depressurization and preventing direct injection of high-pressure airflow. On the other hand, the expansion forms axially alternating dense and sparse deformation protrusions, creating a stepped damping barrier against the flowing oil and gas, dissipating airflow kinetic energy and reducing airflow turbulence noise, thus avoiding disturbance to residents in noise-sensitive areas such as residential areas and schools. Simultaneously, it reduces tank vibration caused by airflow impact, preventing weld loosening and seal degradation. 2. The slot plate's limiting and resetting mechanisms work in tandem to ensure exhaust efficiency and component durability: This invention utilizes a sliding rod in conjunction with an arc-shaped slide rail and a side groove structure. On one hand, it achieves axial positioning of the groove plate when the oil and gas pressure decreases during the later stages of exhaust, keeping it at a high position and preventing it from falling back. This ensures a stable oil and gas flow area at the connection between the external groove and the vertical groove, guaranteeing pressure relief efficiency. On the other hand, after exhaust is completed, when the inner column rotates, the guide block compresses the sliding rod to retract. Combined with the elastic retraction of the first spring and the elastic sleeve, this drives the groove plate to return to its original position smoothly, preventing stress relaxation and permanent deformation caused by long-term expansion of the elastic sleeve. Simultaneously, it achieves precise sealing of the vertical groove and the cylinder hole, extending the service life of the component. 3. Rotational disturbances from the cone and blades optimize the flow path and reduce aerodynamic noise: This invention utilizes a cone-blade structure to drive the cone's rotation through oil and gas impact, breaking up the eddies and turbulence generated during the airflow's upward movement. This converts some of the airflow's kinetic energy into rotational mechanical energy for dissipation, further reducing the instantaneous impact. On the other hand, it guides the oil and gas to smoothly change direction. Combined with an L-shaped bend in the flow path, it extends the flow path and dissipates kinetic energy step by step. At the same time, it avoids eddy accumulation at the bend, ensuring a smooth and stable depressurization process and further reducing aerodynamic noise. 4. Inner column rotation drive control enables switching between pressure relief and sealing: This invention utilizes an inner column rotation design to control the connection and sealing of the vertical slot and the cylinder hole, ensuring rapid pressure relief during faults and reliable sealing during normal operation, thereby improving the stability of transformer operation. On the other hand, it drives the slot plate, elastic sleeve, and other structures to rotate back and forth in small amplitudes. By using the rotating and breaking oil and gas turbulence structure, the elastic sleeve and oil and gas can generate dynamic interaction, further dissipating the gas flow energy and improving the buffering, stress relief, and noise reduction effects. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the oil tank structure of the oil-immersed transformer of the present invention.

[0018] Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle.

[0019] Figure 3 This is a schematic diagram of the fixed cylinder and inner column structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the inner column and side groove structure of the present invention.

[0021] Figure 5 This is a schematic diagram of the box structure of the present invention.

[0022] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point B.

[0023] Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point C.

[0024] Figure 8 For the present invention Figure 6 Enlarged schematic diagram of the structure at point D.

[0025] Figure 9 This is a schematic diagram of the guide block and arc-shaped slide structure of the present invention.

[0026] Figure 10 This is a schematic diagram of the fixed cylinder and cylinder hole structure of the present invention.

[0027] Figure 11 This is a schematic diagram of the ring and cone structure of the present invention.

[0028] Figure 12 This is a schematic diagram of the surrounding ring and inner rod structure of the present invention.

[0029] Figure 13 This is a schematic diagram of the elastic sleeve and insertion tube structure of the present invention.

[0030] In the diagram: 1. Box body; 2. Fixed cylinder; 201. Cylinder hole; 3. Inner column; 4. Vertical groove; 5. External groove; 6. Side groove; 7. Groove plate; 8. Enclosing ring; 9. Cone; 10. Leaf plate; 11. Pressure box; 12. Inner rod; 13. First spring; 14. Elastic sleeve; 15. Flexible hose; 16. Plate track; 17. Slide rod; 18. Ball bearing; 19. Second spring; 20. Insert tube; 21. Ear block; 22. Guide block; 2201. Guide part; 23. Arc-shaped toothed plate; 24. Motor; 25. Gear; 26. Arc-shaped slide. Detailed Implementation

[0031] This invention provides, for example Figures 1 to 13 The oil-immersed transformer tank shown includes a tank body 1. The tank body 1 is equipped with core electrical components such as transformer core, high-voltage winding and low-voltage winding. At the same time, the tank body 1 is filled with sufficient insulating oil, which completely submerges and wraps the core and winding assembly. It has multiple functions, including electrical insulation, heat conduction and heat dissipation, and arc extinguishing in the event of a fault, to ensure the stable operation of the transformer. The tank body 1 and its working principle are common existing technologies and will not be described in detail here.

[0032] When a transformer experiences internal short circuits, localized overheating, or other faults, the losses in the core and winding components are rapidly converted into heat, causing the insulating oil to heat up quickly and vaporize in large quantities. This leads to a rapid increase in internal pressure in the tank. If the pressure is not released in time, it can easily cause the tank to deform, crack, or even explode. Currently, pressure relief valves are commonly used for pressure relief. When the internal pressure reaches a set value, the valve opens to release the oil and gas. However, the initial pressure during the pressure relief phase is extremely high, and the airflow has a strong impact. Due to the lack of a buffer structure, the high-pressure oil and gas are directly ejected outward, generating intense noise with a sound level of 110-130 dB(A). The sound is wide-spectrum, highly sudden, and subjectively perceived by the human ear as a "cracking sound" or "explosion." This is especially problematic in noise-sensitive areas such as residential areas, schools, and hospitals, where it has a significant impact on the surrounding population. It also causes the entire tank to vibrate, leading to loosening of the tank welds, decreased sealing performance, and even cracks and oil leaks in the tank shell, seriously affecting the structural integrity and service life of the tank.

[0033] Therefore, in this invention, a fixing cylinder 2 is fixedly installed on the top of the housing 1. The top of the fixing cylinder 2 is open, and the bottom of the fixing cylinder 2 is provided with a cylinder hole 201. The cylinder hole 201 extends downward and penetrates the top of the housing 1. The fixing cylinder 2 communicates with the interior of the housing 1 through the cylinder hole 201. An inner column 3 is rotatably arranged inside the fixing cylinder 2. A vertical groove 4 is provided at the bottom of the inner column 3. The vertical groove 4 is vertically distributed and close to the outer ring surface of the inner column 3. An outer groove 5 is provided at the top of the inner column 3. The outer groove 5 is inclined and the bottom end of the outer groove 5 communicates with the lower half of the vertical groove 4. When the vertical groove 4 communicates with the cylinder hole 201, the oil and gas are discharged outward from the cylinder hole 201, the vertical groove 4 and the outer groove 5.

[0034] Reference Figure 6 and Figure 8 As shown, a groove plate 7 is slidably arranged in the lower half of the vertical groove 4, and a pressure box 11 is fixedly installed at the top of the vertical groove 4. An inner rod 12 is slidably arranged inside the pressure box 11, and the bottom end of the inner rod 12 passes through the lower surface of the pressure box 11 and is fixedly connected to the groove plate 7. An annular cylindrical elastic sleeve 14 is arranged inside the outer groove 5. The elastic sleeve 14 is distributed along the axial direction of the outer groove 5, and the inner cavity of the elastic sleeve 14 is connected to the pressure box 11.

[0035] Meanwhile, the elastic sleeve 14 is made of high-temperature resistant fluororubber, and the thickness of its inner ring wall is distributed alternately along the axial direction, as follows: along the axial direction, there are four alternating thick and thin areas: a thin area with a thickness of 0.5 mm, a thick area with a thickness of 1.2 mm, a thin area with a thickness of 0.5 mm, and a thick area with a thickness of 1.2 mm. The thin areas are spaced 15 mm apart. After inflation, the deformation amplitude of the thin area is 2 to 3 times that of the thick area, forming an axially alternating deformation protrusion.

[0036] During exhaust: In the first step, the inner column 3 rotates inside the fixed cylinder 2, and the vertical groove 4 switches from a state that is offset from the cylinder hole 201 to a state that is connected.

[0037] In the second step, the oil and gas enter the vertical groove 4 through the cylinder hole 201 and lift the groove plate 7 upward. The inner rod 12 moves upward simultaneously to compress the pressure box 11. The gas inside the pressure box 11 enters the inner cavity of the elastic sleeve 14. During this process, the elastic sleeve 14 expands and deforms under the action of air pressure, providing elastic support and damping buffer for the groove plate 7, and weakening the instantaneous impact force of the oil and gas.

[0038] In the third step, the oil and gas are discharged outward through the cylinder hole 201, the vertical groove 4 and the external groove 5. Since the inner ring wall thickness of the elastic sleeve 14 is distributed alternately along the axial direction, after expansion, it forms a deformation protrusion with alternating density along the axial direction, which generates a stepped damping barrier on the flowing oil and gas, effectively dissipating the kinetic energy of the airflow, and at the same time reducing the turbulence noise of the airflow.

[0039] The fourth step involves the inner column 3 driving the groove plate 7, elastic sleeve 14, and other structures to reciprocate in small amplitudes. By utilizing the rotating and breaking oil and gas turbulence structure, the elastic sleeve 14 interacts dynamically with the oil and gas, further dissipating the gas flow energy and improving the buffering and unloading effect.

[0040] After use, the inner column 3 rotates, causing the vertical groove 4 and the cylindrical hole 201 to be misaligned. The bottom plane of the inner column 3 seals and closes the cylindrical hole 201. At this time, the elastic sleeve 14 retracts due to its own elasticity, causing the groove plate 7 to move downward and reset. The gas in the inner cavity of the elastic sleeve 14 flows back into the pressure box 11, preventing the elastic sleeve 14 from being in an expanded state for a long time, which can cause stress relaxation and permanent deformation, and effectively extend the service life of the component.

[0041] In summary, by using multi-stage damping buffering and dynamic flow diversion for pressure relief, the problems of excessive instantaneous impact and intense jet noise in the initial stage of pressure relief valves are effectively solved, keeping the pressure relief noise at a low level and avoiding disturbance to residents in noise-sensitive areas such as residential areas, schools, and hospitals. At the same time, by relying on damping buffering and dynamic disturbance to reduce airflow impact, the overall vibration of the oil tank is reduced, ensuring the structural integrity and service life of the oil tank, thereby improving the overall operational stability of the transformer.

[0042] It should be noted that the elastic sleeve 14 has good elastic deformation capability and sealing performance. When the pressure box 11 is under pressure, it can generate synchronous expansion and contraction deformation through the internal air pressure change, thereby forming a flexible buffer and damping noise reduction effect on the high-pressure oil and gas flowing through it. In addition, compared with the rigid deformation protrusion structure in the prior art, the flexible corrugated interface of the elastic sleeve 14 can achieve dynamic impedance matching over a wide pressure range, avoiding the risk of breakage or plastic deformation, and has better broadband noise reduction characteristics and fatigue durability.

[0043] In addition, a shield is fixedly installed on the top of the housing 1 to cover the top of the fixed cylinder 2 (not shown in the figure) to prevent rainwater and other substances from entering the interior of the external groove 5.

[0044] In actual use, the inner diameter of the cylindrical hole 201 is larger than the inner diameter of the vertical groove 4, ensuring that the vertical groove 4 and the cylindrical hole 201 are stably connected when the inner column 3 drives the groove plate 7, elastic sleeve 14 and other structures to rotate synchronously in a small amplitude. In addition, the fixed cylinder 2 and the inner column 3 are provided with ball bearings, wear-resistant sealing gaskets and other structures to reduce wear and ensure sealing. Wear resistance and sealing are common technologies in the present, and will not be described in detail here.

[0045] Reference Figure 6 As shown, a first spring 13 is provided inside the pressure box 11. The top end of the first spring 13 is fixedly connected to the top of the pressure box 11, and the bottom end of the first spring 13 is fixedly connected to the top of the inner rod 12. The elastic support force of the first spring 13 is appropriate. In the initial stage of exhaust, when the oil and gas push the groove plate 7 and drive the inner rod 12 to move upward, the first spring 13 is compressed by force. After exhaust is completed and the oil and gas pressure dissipates, the first spring 13 relies on the reset elastic force, in conjunction with the elastic retraction of the elastic sleeve 14, to drive the groove plate 7 and the inner rod 12 to move downward smoothly and reset.

[0046] Reference Figure 4 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, considering that although the oil and gas pressure decreases in the later stage of exhaust, the airflow will still generate noise. Affected by the decrease in oil and gas pressure, the slot plate 7 will move downward and reset, resulting in a reduction in the oil and gas passage area at the connection between the external slot 5 and the vertical slot 4, reducing exhaust efficiency. At the same time, the air pressure in the inner cavity of the elastic sleeve 14 decreases synchronously, and the degree of expansion decreases accordingly, affecting the flexible buffer and damping noise reduction effect. In order to achieve the positioning of the slot plate 7, a plate channel 16 is provided on the side wall of the slot plate 7. The plate channel 16 is located on the side of the slot plate 7 away from the external slot 5. A slide rod 17 is slidably arranged inside the plate channel 16. A second spring 19 is arranged inside the plate channel 16. One end of the second spring 19 is fixedly connected to the slide rod 17, and the other end of the second spring 19 is fixedly connected to the inner wall of the plate channel 16. The elastic support force of the second spring 19 is less than the elastic support force of the first spring 13.

[0047] Meanwhile, an arc-shaped slide 26 is formed between the outer wall of the inner column 3 and the inner wall of the fixed cylinder 2. The arc-shaped slide 26 is distributed correspondingly to the upper half of the inner column 3. The upper half of the side wall of the vertical groove 4 is provided with a side groove 6. The vertical groove 4 is connected to the arc-shaped slide 26 through the side groove 6.

[0048] In actual use, oil and gas enter the vertical groove 4 through the cylinder hole 201 and lift the groove plate 7 upward. In the initial stage of exhaust, the oil and gas pressure is relatively high, and the groove plate 7 moves upward quickly. When the inner rod 12 can no longer retract into the pressure box 11, the groove plate 7 moves to the highest position. At this time, the sliding rod 17 is aligned with the bottom end of the side groove 6. Under the action of the reset force of the second spring 19, the sliding rod 17 extends out and passes through the side groove 6 into the arc-shaped slide 26. When the oil and gas pressure decreases in the later stage of exhaust, the sliding rod 17 abuts against the bottom end of the side groove 6 and the arc-shaped slide 26 to achieve axial limit of the groove plate 7, so that it remains in a high position and does not fall back during the exhaust process, ensuring a stable oil and gas passage area. At the same time, it keeps the elastic sleeve 14 in an expanded deformation state to ensure the noise reduction effect.

[0049] Reference Figure 6 , Figure 7 , Figure 9 and Figure 10 As shown, in order to realize the repositioning of the structure such as the slot plate 7, a guide block 22 is provided in the arc-shaped slide 26. The guide block 22 is arc-shaped. The outer arc surface of the guide block 22 is fixedly connected to the inner wall of the fixed cylinder 2. The inner arc surface of the guide block 22 is attached to the outer wall of the inner column 3. The guide block 22 is aligned with the bottom end of the side groove 6. The end of the guide block 22 has a guide part 2201. A ball bearing 18 is movably embedded at the end of the slide rod 17 away from the second spring 19. The ball bearing 18 abuts against the guide block 22.

[0050] During the venting process, the guide block 22 and the side groove 6 are offset, which does not affect the extension of the slide rod 17 and its entry into the arc-shaped slide 26 through the side groove 6. After the venting is completed, the inner column 3 is rotated, and the ball 18 first contacts the guide part 2201. Under the guidance of the guide part 2201, it smoothly slides to the inner arc surface of the guide block 22. Under the pressure of the guide block 22, the slide rod 17 is completely retracted into the plate channel 16. The elastic retraction of the first spring 13 and the elastic sleeve 14 drives the groove plate 7 to move downward and reset. At the same time, the vertical groove 4 and the cylindrical hole 201 are offset from each other, and the bottom end of the inner column 3 seals and closes the cylindrical hole 201.

[0051] Furthermore, when the inner column 3 drives the groove plate 7, elastic sleeve 14 and other structures to reciprocate in small amplitudes, the ball 18 does not contact the guide part 2201 or the guide block 22.

[0052] Reference Figure 2 and Figure 3As shown, in order to achieve the rotation of the inner column 3, a drive mechanism is provided on the outside of the inner column 3. The drive mechanism includes an arc-shaped toothed plate 23, a motor 24 and a gear 25. The arc-shaped toothed plate 23 is fixedly connected to the outer wall of the inner column 3, the motor 24 is fixedly installed on the outer wall of the fixed cylinder 2, and the gear 25 is fixedly connected to the drive shaft of the motor 24. The arc-shaped toothed plate 23 and the gear 25 are meshed together. The motor 24 drives the gear 25 to rotate, thereby driving the arc-shaped toothed plate 23 and the inner column 3 to rotate, thereby controlling the connection and sealing state between the cylinder hole 201 and the vertical groove 4.

[0053] In addition, a pressure sensor is installed on the housing 1 to monitor the pressure inside the housing 1. A controller is connected between the motor 24 and the pressure sensor. When the pressure sensor detects that the pressure exceeds the set threshold, it transmits this information to the controller, which then controls the motor 24 to start. The controller and its control principle are common technologies and will not be described in detail here.

[0054] Reference Figure 6 , Figure 11 and Figure 12 As shown, to reduce the impact of oil and gas on the trough plate 7, the lower surface of the trough plate 7 is inclined, and the side near the external groove 5 is inclined upward; a cone 9 is rotatably installed at the bottom of the trough plate 7, and the tip of the cone 9 is inclined towards the external groove 5 at an angle of 30°; six blades 10 are fixedly installed on the side of the cone 9, and the six blades 10 are evenly distributed around the axis of the cone 9. The blades 10 are inclined relative to the generatrix of the cone 9 at an angle of 30°; during exhaust, the airflow impacts the blades 10 and drives the cone 9 to rotate at a speed of 3000 to 5000 rpm. The rotating cone 9 and blades 10 convert part of the kinetic energy of the airflow into rotational mechanical energy, and at the same time break the vortex generated during the airflow lifting process, reducing the kinetic energy of the airflow by 30% to 50%, effectively reducing the aerodynamic noise during the depressurization process. The angle and other data can be adjusted according to the specific application.

[0055] Furthermore, the oil and gas are discharged outward through the cylinder hole 201, vertical groove 4 and external groove 5, forming an L-shaped bend guiding path, which effectively extends the flow path and dissipates the kinetic energy of the airflow step by step; at the same time, in the bend area, the cone 9 is continuously rotated by the airflow impact, disturbing and breaking the eddies and turbulence that are easily formed at the bend, and guiding the airflow to the outlet of the external groove 5, ensuring a smooth and stable depressurization process.

[0056] The specific operating conditions are as follows: In the first stage, oil and gas enter the vertical groove 4 through the cylinder hole 201 and lift the groove plate 7. The high-speed airflow continuously impacts the blade 10, causing the cone 9 to rotate synchronously. The rotating cone 9 and the blade 10 break the vortex generated during the airflow lifting process. At the same time, the first spring 13 is compressed by force, and the elastic sleeve 14 is inflated and deformed. The two work together to buffer and depressurize the oil and gas and dissipate kinetic energy, weakening the instantaneous impact force in the initial stage of exhaust.

[0057] Second stage: When the inner rod 12 can no longer retract into the pressure box 11, the slot plate 7 moves to the highest position. Under the elastic force of the second spring 19, the sliding rod 17 extends out, passes through the side slot 6 and extends into the arc-shaped slide 26, thereby achieving axial limiting of the slot plate 7. During this process, the oil and gas are discharged outward in sequence through the cylinder hole 201, the vertical slot 4 and the outer slot 5. The cone 9 continues to rotate under the continuous impact of the airflow, converting part of the kinetic energy of the oil and gas into rotational mechanical energy for dissipation. In conjunction with the inclined slot plate 7, the oil and gas are guided to smoothly turn and flow into the outer slot 5, while breaking the airflow vortex and reducing the aerodynamic noise during the depressurization process.

[0058] Reference Figure 6 , Figure 11 and Figure 12 As shown, a retaining ring 8 is fixedly connected to the top of the trough plate 7. The outer wall of the retaining ring 8 slides against the inner wall of the vertical trough 4, and the height of the retaining ring 8 is greater than the height of the connection between the outer groove 5 and the vertical trough 4. During the upward sliding of the trough plate 7, the retaining ring 8 moves upward synchronously with the trough plate 7, always blocking the area above the trough plate 7 where the connection between the outer groove 5 and the vertical trough 4 is located, effectively preventing oil and gas from entering the cavity above the trough plate 7 in the vertical trough 4 through the outer groove 5, and ensuring stable discharge of oil and gas.

[0059] Reference Figure 5 , Figure 7 and Figure 13 As shown, in order to realize the disassembly, maintenance and positioning of the elastic sleeve 14, an insert tube 20 is inserted into the inner wall of the outer groove 5. An ear block 21 is fixedly connected to the insert tube 20. The ear block 21 is fixedly installed on the inner column 3 by screws. The elastic sleeve 14 is adhered to the inner wall of the insert tube 20. The structure of insert tube 20, ear block 21 and other structures facilitates the quick disassembly and replacement of the elastic sleeve 14 and improves the maintenance efficiency of the mechanism. At the same time, the inner column 3 adopts an axially distributed split assembly design, which can be reassembled and fixed after the assembly process of the pressure box 11 and other structures is completed.

[0060] A flexible tube 15 is connected to the elastic sleeve 14. The end of the flexible tube 15 away from the elastic sleeve 14 is connected to the top of the pressure box 11, ensuring that the gas inside the elastic sleeve 14 and the pressure box 11 can flow bidirectionally through the flexible tube 15.

[0061] The present invention also discloses a transformer that uses the above-mentioned oil-immersed transformer tank to dissipate the kinetic energy of oil and gas while reducing airflow turbulence noise, thereby avoiding disturbance to residents in noise-sensitive areas such as residential areas and schools.

Claims

1. An oil-immersed transformer tank, characterized in that, include: The enclosure (1) is filled with insulating oil; The fixing cylinder (2) is fixed to the top of the box body (1); The inner column (3) is rotatably installed inside the fixed cylinder (2). The bottom of the inner column (3) is provided with a vertical groove (4), and the top is provided with an external groove (5) that communicates with the lower half of the vertical groove (4). The vertical groove (4) and the box (1) are connected or separated by the rotation of the inner column (3). The groove plate (7) is slidably set in the lower half of the vertical groove (4); The pressure box (11) is fixed to the top of the vertical groove (4). The inner rod (12) is slidably provided inside the pressure box (11). The bottom end of the inner rod (12) is connected to the groove plate (7). The elastic sleeve (14) is located in the outer groove (5). The inner cavity of the elastic sleeve (14) is connected to the pressure box (11), and the thickness of the inner ring wall is distributed alternately along the axial direction. After inflation, it forms a deformed protrusion with alternating density along the axial direction. During exhaust, the oil and gas lifting trough plate (7) compresses the pressure box (11), and the gas in the pressure box (11) enters the inner cavity of the elastic sleeve (14) to expand, providing elastic support and damping buffer for the trough plate (7). At the same time, the deformation protrusion generates a stepped damping barrier for the oil and gas discharged through the vertical trough (4) and the external trough (5), dissipating kinetic energy and reducing noise.

2. The oil-immersed transformer tank according to claim 1, characterized in that, The side of the groove plate (7) is provided with a sliding rod (17) for telescopic movement. An arc-shaped slide (26) is formed between the outer wall of the inner column (3) and the inner wall of the fixed cylinder (2). The arc-shaped slide (26) is distributed correspondingly to the upper half of the inner column (3). The upper half of the side wall of the vertical groove (4) is provided with a side groove (6). The vertical groove (4) is connected to the arc-shaped slide (26) through the side groove (6). When the trough plate (7) is moved to the highest position, the slide rod (17) extends through the side groove (6) and enters the arc-shaped slide (26) to axially limit the trough plate (7) and maintain the oil and gas passage area and the expansion state of the elastic sleeve (14).

3. The oil-immersed transformer tank according to claim 2, characterized in that, The arc-shaped slide (26) is provided with a guide block (22). The guide block (22) is arc-shaped. The outer arc surface of the guide block (22) is fixedly connected to the inner wall of the fixed cylinder (2). The inner arc surface of the guide block (22) is attached to the outer wall of the inner column (3). The slide rod (17) abuts against the guide block (22). After exhausting the air, the guide block (22) and the inner column (3) rotate synchronously to squeeze the slide bar (17) and retract, and the groove plate (7) is reset.

4. The oil-immersed transformer tank according to claim 1, characterized in that, The lower surface of the groove plate (7) is inclined, and the side near the external groove (5) is inclined upward.

5. The oil-immersed transformer tank according to claim 1, characterized in that, The bottom of the groove plate (7) is rotatably provided with a cone (9), and the tip of the cone (9) is inclined towards the outer groove (5); A blade (10) is fixedly installed on the side of the cone (9).

6. The oil-immersed transformer tank according to claim 1, characterized in that, The bottom of the fixed cylinder (2) is provided with a cylinder hole (201), and the cylinder hole (201) extends downward through the top of the box body (1). When the vertical groove (4) is connected to the cylinder hole (201), the oil and gas are discharged outward from the cylinder hole (201), the vertical groove (4) and the external groove (5). The inner diameter of the cylindrical hole (201) is larger than the inner diameter of the vertical groove (4).

7. The oil-immersed transformer tank according to claim 1, characterized in that, The pressure box (11) is provided with a first spring (13) inside, which is connected between the top of the pressure box (11) and the top of the inner rod (12).

8. The oil-immersed transformer tank according to claim 1, characterized in that, The inner column (3) is provided with a drive mechanism, which includes an arc-shaped toothed plate (23), a motor (24) and a gear (25). The arc-shaped toothed plate (23) is fixedly connected to the outer wall of the inner column (3), the motor (24) is fixedly installed on the outer wall of the fixed cylinder (2), and the gear (25) is fixedly connected to the drive shaft of the motor (24). The arc-shaped toothed plate (23) and the gear (25) are meshed together.

9. The oil-immersed transformer tank according to claim 1, characterized in that, The top of the groove plate (7) is fixedly connected to a retaining ring (8). The outer wall of the retaining ring (8) slides against the inner wall of the vertical groove (4), and the height of the retaining ring (8) is greater than the height of the connecting part between the outer groove (5) and the vertical groove (4).

10. A transformer, characterized in that, Using the oil-immersed transformer tank as described in any one of claims 1 to 9, the kinetic energy of oil and gas is dissipated while reducing airflow turbulence noise, thus avoiding disturbance to residents in noise-sensitive areas such as residential communities and schools.

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