Low-noise oil-immersed transformer

Abstract

The invention relates to the technical field of transformers, in particular to a low-noise oil-immersed transformer which comprises a transformer body, an oil conservator is fixedly communicated with the top face of the transformer body, a breathing pipeline is fixedly communicated with the bottom of the oil conservator, the low-noise oil-immersed transformer further comprises an air guide tank, and the top of the air guide tank is fixedly communicated with the breathing pipeline. An exhaust valve and a sliding rail are arranged on the surface of the air guide tank, the sliding rail is fixed to the bottom of the air guide tank, a supporting disc is fixed to the bottom of the sliding rail, after the lower drying tank is completely saturated, the air inlet valve of the lower drying tank is closed firstly, and meanwhile the air inlet valve of the upper drying tank is opened, so that air only passes through the upper drying tank to work; independent dehumidification of the upper drying tank is achieved, the situation that in the replacement process, the dehumidification function is interrupted, and consequently a breathing opening needs to be closed is avoided, the normal breathing function of the transformer is guaranteed, and the adverse effect generated by closing the breathing opening is reduced.

Description

Technical Field

[0001] The present invention relates to the field of transformers, and in particular to a low-noise oil-immersed transformer. Background Art

[0002] Oil-immersed transformers are mainly composed of iron core, winding, oil tank, oil pillow, insulating sleeve, radiator and desiccant. The winding is wrapped in insulating oil. The damping effect of the oil can effectively buffer the vibration transmission caused by electromagnetic force. The insulating oil can significantly attenuate the vibration energy, making the noise level of oil-immersed transformers generally lower than that of dry-type transformers of the same capacity, meeting the needs of noise-sensitive scenarios such as urban power distribution and residential areas.

[0003] The desiccant of an existing oil-immersed transformer is connected to the oil pillow. The desiccant is filled with color-changing desiccant particles, which filter the air entering the oil pillow to keep the oil dry. This type of desiccant will change color after absorbing moisture in the air, which intuitively reflects the moisture absorption status. When the desiccant extension change range reaches the preset range, for example, when it reaches two-thirds of the total height of the desiccant, it is difficult to achieve effective dehumidification performance due to the subsequent unsaturated desiccant, and it must be replaced in time.

[0004] From the above example, we can see that when replacing the desiccant, one-third of the desiccant height is still not saturated, and replacing it all at once will cause material waste. In addition, when replacing the desiccant, it is usually necessary to temporarily close the breathing port of the desiccant to prevent the undried air from directly entering the transformer oil pillow. However, the short-term closure of the breathing port will disrupt the pressure balance between the inside and outside of the transformer. ， This may cause a short-term negative pressure or positive pressure in the oil tank, thereby affecting the circulation and heat dissipation efficiency of the transformer oil. It can be seen that the existing transformer aspirator still has a lot of room for improvement. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art, such as material waste and the need to close the breathing port when replacing the desiccant, and to propose a low-noise oil-immersed transformer.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a low-noise oil-immersed transformer, comprising a transformer body, an oil pillow fixedly connected to the top surface of the transformer body, a breathing duct fixedly connected to the bottom of the oil pillow, and further comprising: An air guide tank, the top of which is fixedly connected to the breathing duct, and an exhaust valve is provided on the surface of the air guide tank; A slide rail, the slide rail is fixed to the bottom of the gas guide tank, and a support plate is fixed to the bottom of the slide rail; Two docking plates, both of which are vertically slidably connected to the slide rail, with an air outlet valve and an air inlet valve fixed to the surfaces of the two docking plates from top to bottom, the air inlet valve being connected to the space below the slide rail through an elastic pipe, and the air outlet valve being connected to the air guide tank through an elastic pipe; Two drying cans are stacked up and down on a support plate. The drying cans are magnetically connected to the docking plate via a magnetic assembly. Two docking holes are provided on the side walls of the drying cans, which are respectively connected to the air inlet valve and the air outlet valve. Connecting grooves are provided on the top and bottom surfaces of the drying cans. The connecting groove at the bottom of the upper drying can is connected to the connecting groove at the top of the lower drying can.

[0007] Specifically, in the present invention, each drying tank is filled with the same amount of conventional desiccant, thereby ensuring that the upper drying tank still has reliable dehumidification performance during the replacement of the lower drying tank, thereby ensuring that the lower drying tank can be replaced after it is fully saturated, thereby avoiding waste of desiccant; when the lower drying tank is fully saturated, the air inlet valve of the lower drying tank is closed first, and the air inlet valve of the upper drying tank is opened at the same time, so that the gas only passes through the upper drying tank to work, thereby achieving independent dehumidification of the upper drying tank, avoiding the dehumidification function being interrupted during the replacement process, resulting in the need to close the breathing port or the like, which is beneficial to ensuring the normal breathing function of the transformer and reducing the occurrence of closed breathing ports. Adverse effects; due to the magnetic connection between the drying tank and the docking plate, the lower drying tank can be manually taken out to separate the lower drying tank from the docking plate, and then the upper drying tank is moved downward and the lower docking plate is moved upward. Finally, the new drying tank is docked with the upper docking plate, and the opening and closing states of the air outlet valve and the air inlet valve are readjusted to complete the replacement work. This embodiment provides independent exhaust pipes and air inlet pipes on each drying tank and adjusts the exhaust and air inlet pipes. During the replacement process, the drying tank that has not been replaced can work alone. After the replacement is completed, the two drying tanks work together to avoid interruption of the dehumidification function during replacement, which would cause adverse effects on the transformer.

[0008] Preferably, the magnetic attraction component includes a mounting groove, which is opened on the docking plate, a magnet is fixed inside the mounting groove, an insertion block is fixed on the surface of the drying tank, the insertion block is made of ferromagnetic material, and the insertion block is inserted into the mounting groove.

[0009] Specifically, during installation, the insertion block on the surface of the drying tank is inserted into the installation slot so that it is attracted by the magnet, thereby making the drying tank stably docked with the docking plate, and when the docking plate rises and falls, the drying tank can rise and fall synchronously.

[0010] Preferably, two partitions are fixed inside the drying tank, through holes are opened on the surfaces of the two partitions, support nets are fixed in the through holes, and spiral blades are provided between the two partitions.

[0011] Specifically, the present invention sets upper and lower partitions in the drying tank, installs spiral blades between the two partitions and fills desiccant, and uses a support net to prevent the desiccant from leaving the partition interval. When air is taken in, the gas enters from the through holes at the bottom of the partition and is discharged from the through holes at the top, and flows upward in a spiral channel formed by the spiral blades between the partitions. On the one hand, the contact area and time between the desiccant and the gas are increased by extending the gas flow path, thereby effectively improving the drying efficiency. On the other hand, the gas is allowed to penetrate upward layer by layer along the spiral trajectory, ensuring that the desiccant can change color layer by layer according to the order of contact with the gas. This not only facilitates the accurate judgment of the desiccant replacement time, but also avoids the overall waste problem caused by excessive failure of local desiccant.

[0012] Preferably, two vertical plates are fixed on the bottom surface of the drying tank, the top ends of the two vertical plates pass through the spiral blades and the partition and extend out, and a plurality of air holes are evenly opened on the surfaces of the vertical plates.

[0013] Preferably, a sliding cavity is provided inside the vertical plate, the bottom of the sliding cavity passes through the vertical plate and the drying tank, a sliding plate is slidably connected to the inside of the sliding cavity, a first spring is fixed between the top surface of the sliding plate and the sliding cavity, an air permeable groove is provided on the surface of the sliding plate, limited shrinkage holes are provided between adjacent air permeable grooves, limited shrinkage tubes are fixed in the limited shrinkage holes, the spiral blades divide the vertical plate into multiple processing sections, the aperture of the limited shrinkage tube in each processing section is the same and the aperture increases along the height direction of the processing section, a raised strip is fixed on the support plate, and the raised strip is inserted into the interior of the sliding cavity.

[0014] Preferably, the shrinkage tube includes an inner tube and an outer tube, a support frame is fixed between the inner tube and the outer tube, an installation cavity is provided between the inner tube and the outer tube, a first sealing ring and a second sealing ring are provided in the installation cavity, the first sealing ring and the second sealing ring are respectively sealed at both ends of the installation cavity, a connecting rod is fixed between the first sealing ring and the second sealing ring, the connecting rod is slidably connected to the support frame, and an elastic support component is provided between the first sealing ring and the inner wall of the installation cavity.

[0015] Preferably, the elastic support assembly includes a moisture absorbing block, one end of the moisture absorbing block is fixed to the first sealing ring, and a second spring is fixed between the other end of the moisture absorbing block and the installation cavity.

[0016] Preferably, the installation cavity includes an expansion cavity and two blocking cavities, the two blocking cavities are arranged on both sides of the expansion cavity, and the inner diameter of the blocking cavity is smaller than the inner diameter of the expansion cavity.

[0017] Preferably, guide grooves are provided on the side walls of the two blocking cavities, and the guide grooves are connected to the interior of the expansion cavity.

[0018] Preferably, an oil seal can is fixed to the bottom of the support plate, a baffle is fixed inside the oil seal can, an air inlet hole is opened on the surface of the oil seal can, a breathable mesh is fixed to the bottom of the baffle, the interior of the oil seal can is filled with oil, the top surface of the oil submerges the breathable mesh, and the elastic pipe of the air inlet valve is connected to the interior of the oil seal can.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, each drying tank is filled with the same amount of desiccant as conventional desiccant, thereby ensuring that the upper drying tank still has reliable dehumidification performance during the replacement of the lower drying tank. This ensures that the lower drying tank can be replaced after it is fully saturated, avoiding waste of desiccant.

[0020] 2. When the lower drying tank is fully saturated, close the air inlet valve of the lower drying tank first, and open the air inlet valve of the upper drying tank at the same time, so that the gas only passes through the upper drying tank to achieve separate dehumidification of the upper drying tank, avoiding the interruption of the dehumidification function during the replacement process, which requires closing the breathing port or other situations. This is conducive to ensuring the normal breathing function of the transformer and reducing the adverse effects of closing the breathing port.

[0021] 3. The present invention sets a partition with upper and lower spacing in the drying tank, installs a spiral blade between the two partitions and fills the desiccant, and uses a support net to prevent the desiccant from leaving the partition interval. When air is taken in, the gas enters from the through hole at the bottom of the partition and is discharged from the through hole at the top, and spirally rises along the spiral channel formed by the spiral blade between the partitions. On the one hand, the contact area and time between the desiccant and the gas are increased by extending the gas flow path, thereby effectively improving the drying efficiency. On the other hand, the gas penetrates upward layer by layer along the spiral trajectory, ensuring that the desiccant can change color layer by layer according to the order of contact with the gas. This not only facilitates the accurate judgment of the desiccant replacement time, but also avoids the overall waste problem caused by excessive failure of local desiccant. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 for Figure 1 A partial enlarged view of point A in the middle; Figure 3Schematic diagram of the structure of the slide rail and the support plate in one embodiment of the present invention; Figure 4 Schematic diagram of the cross-sectional structure of a drying tank in one embodiment of the present invention Figure 1 ; Figure 5 Schematic diagram of the cross-sectional structure of a drying tank in one embodiment of the present invention Figure 2 ; Figure 6 Schematic diagram of the cross-sectional structure of the air guide tank and the slide rail in one embodiment of the present invention; Figure 7 is a schematic cross-sectional structural diagram of a vertical plate in one embodiment of the present invention; Figure 8 Schematic diagram of the cross-sectional structure of a shrinkage tube in one embodiment of the present invention; Figure 9 Schematic diagram of the overall cross-sectional structure of an embodiment of the present invention; Figure 10 for Figure 9 A partial enlarged view of point B in the middle; Figure: 1. Transformer body; 2. Oil pillow; 3. Breathing duct; 4. Air guide tank; 5. Exhaust valve; 6. Slide rail; 7. Support plate; 8. Docking plate; 9. Exhaust valve; 10. Inlet valve; 11. Drying tank; 12. Docking hole; 13. Connecting groove; 14. Mounting groove; 15. Magnet; 16. Insert block; 17. Partition; 18. Through hole; 19. Support net; 20. Spiral blade; 21. Vertical plate; 22. Air vent; 23. Sliding cavity; 24. Sliding plate ; 25. First spring; 26. Breathing groove; 27. Shrinkage limiting hole; 28. Shrinkage limiting tube; 29. ​​Raised strip; 30. Inner tube; 31. Outer tube; 32. Support frame; 33. Installation cavity; 34. First sealing ring; 35. Second sealing ring; 36. Connecting rod; 37. Moisture absorbing block; 38. Second spring; 39. Expansion cavity; 40. Sealing cavity; 41. Guide groove; 42. Oil seal tank; 43. Baffle; 44. Air inlet; 45. Breathable mesh plate; 46. Regulating valve. DETAILED DESCRIPTION

[0023] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0024] like Figures 1 to 10 The low-noise oil-immersed transformer shown includes a transformer body 1, an oil pillow 2 fixedly connected to the top surface of the transformer body 1, and a breathing duct 3 fixedly connected to the bottom of the oil pillow 2, and further includes: An air guide tank 4, the top of which is fixedly connected to the breathing pipe 3, and an exhaust valve 5 is provided on the surface of the air guide tank 4; Slide rail 6, which is fixed to the bottom of the air guide tank 4, and a support plate 7 is fixed to the bottom of the slide rail 6; Two docking plates 8, both of which are vertically slidably connected to the slide rail 6, and an air outlet valve 9 and an air inlet valve 10 are fixed on the surface of the two docking plates 8 from top to bottom. The air inlet valve 10 is connected to the space below the slide rail 6 through an elastic pipe, and the air outlet valve 9 is connected to the air guide tank 4 through an elastic pipe; Two drying cans 11 are stacked up and placed on the support plate 7. The drying cans 11 are magnetically connected to the docking plate 8 through a magnetic attraction component. Two docking holes 12 are provided on the side walls of the drying cans 11. The docking holes 12 are connected to the air inlet valve 10 and the air outlet valve 9 respectively. Connecting grooves 13 are provided on the top and bottom surfaces of the drying cans 11. The bottom connecting groove 13 of the upper drying can 11 is connected to the top connecting groove 13 of the lower drying can 11.

[0025] Specifically, under normal conditions, the air inlet valve 10 of the lower drying canister 11 is open, and the air outlet valve 9 is closed. The air inlet valve 10 of the upper drying canister 11 is closed, and the air outlet valve 9 is open. A regulating valve 46 is provided in the communication groove 13 at the top of the drying canister 11. When the two drying canisters 11 are docked, the regulating valve 46 at the bottom is opened and rotated, thereby connecting the upper and lower drying canisters 11 to each other through the communication groove 13. A sealing gasket is fixed to the bottom of the drying canister 11 to ensure the sealing between the two drying canisters 11. When the oil pillow 2 inhales, the gas enters the lower drying tank 11 through the elastic pipe and the air inlet valve 10, and is dried by the color-changing desiccant in the lower drying tank 11. The gas moves upward along the lower drying tank 11 and passes through the connecting groove 13 to enter the upper drying tank 11. Finally, the gas is discharged from the outlet valve 9 of the upper drying tank 11 into the air guide tank 4 and then into the breathing pipe 3. From the breathing pipe 3, it enters the interior of the oil pillow 2, completing the inhalation function. When the oil pillow 2 exhales, the gas is discharged into the air guide tank 4 through the breathing pipe 3 and is directly discharged from the exhaust valve 5. The exhausted gas does not pass through the desiccant, which helps to prevent the oil mist in the gas from contaminating the desiccant. It should be noted that in the present invention, each drying tank 11 is filled with the same amount of desiccant as conventional desiccant, thereby ensuring that during the process of replacing the lower drying tank 11, the upper drying tank 11 still has reliable dehumidification performance, thereby ensuring that the lower drying tank 11 can be replaced after it is completely saturated, thereby avoiding waste of desiccant; The specific replacement method is as follows: when the lower drying tank 11 is fully saturated, the air inlet valve 10 of the lower drying tank 11 is closed first, and the air inlet valve 10 of the upper drying tank 11 is opened at the same time, so that the gas only passes through the upper drying tank 11 to achieve independent dehumidification of the upper drying tank 11, avoiding the interruption of the dehumidification function during the replacement process, resulting in the need to close the breathing port or other situations, which is conducive to ensuring the normal breathing function of the transformer and reducing the adverse effects of closing the breathing port; Since the drying tank 11 is magnetically connected to the docking plate 8, the lower drying tank 11 can be manually taken away to separate the lower drying tank 11 from the docking plate 8. Then, the upper drying tank 11 is moved downward and the lower docking plate 8 is moved upward. Finally, the new drying tank 11 is docked with the upper docking plate 8, and the opening and closing states of the air outlet valve 9 and the air inlet valve 10 are readjusted to complete the replacement. In this embodiment, by providing independent exhaust and air inlet pipes on each drying tank 11 and adjusting the exhaust and air inlet pipes, the drying tank 11 that has not been replaced can operate independently during the replacement process. After the replacement is completed, the two drying tanks 11 work together to avoid interruption of the dehumidification function during the replacement, which would have an adverse effect on the transformer. It should be noted that the sliding mode between the docking plate 8 and the slide rail 6 can adopt a damping sliding mode, thereby ensuring the stability of the upper drying tank 11 when it slides down, and also preventing the docking plate 8 from automatically sliding down when the lower docking plate 8 is moved up, thereby affecting the installation speed; A sealing ring can be fixed on the outside of the docking hole 12. Under the action of magnetic attraction, the docking hole 12 can be sealed with the outlet valve 9 and the inlet valve 10. The docking hole 12 can also be installed with other docking structures to seal and dock with the outlet valve 9 and the inlet valve 10. This is the existing technology and will not be elaborated here.

[0026] As a further embodiment of the present invention, the magnetic attraction component includes a mounting groove 14, which is opened on the docking plate 8. A magnet 15 is fixed inside the mounting groove 14, and an insertion block 16 is fixed on the surface of the drying tank 11. The insertion block 16 is made of ferromagnetic material and is inserted into the mounting groove 14.

[0027] Specifically, during installation, the insertion block 16 on the surface of the drying tank 11 is inserted into the installation groove 14 so that it is attracted by the magnet 15, thereby making the drying tank 11 stably docked with the docking plate 8, and when the docking plate 8 rises and falls, the drying tank 11 can rise and fall synchronously.

[0028] As a further embodiment of the present invention, two partitions 17 are fixed inside the drying tank 11 . Through holes 18 are formed on the surfaces of the two partitions 17 . Support nets 19 are fixed in the through holes 18 . A spiral blade 20 is provided between the two partitions 17 .

[0029] Specifically, when using color-changing desiccant, the replacement time needs to be determined by the degree of color change layer by layer. However, since the air inlet of the drying tank 11 is set on the side and the gas tends to be adsorbed upward, the desiccant far from the air inlet may not be fully contacted by the gas, resulting in uneven color change, which leads to the waste of part of the desiccant not being effectively utilized. The present invention can solve the above problem. The specific working method is as follows: the present invention provides a partition 17 with an upper and lower spacing in the drying tank 11, installs a spiral blade 20 between the two partitions 17 and fills the desiccant, and uses a support net 19 to prevent the desiccant from being effectively utilized. The desiccant leaves the partition 17 area. When air is taken in, the gas enters from the through hole 18 at the bottom of the partition 17 and is discharged from the through hole 18 at the top. It flows upward in a spiral along the spiral channel formed by the spiral blades 20 between the partitions 17. On the one hand, the contact area and time between the desiccant and the gas are increased by extending the gas flow path, thereby effectively improving the drying efficiency. On the other hand, the gas penetrates upward layer by layer along the spiral trajectory, ensuring that the desiccant can change color layer by layer according to the order of contact with the gas. This not only facilitates the accurate judgment of the desiccant replacement time, but also avoids the overall waste problem caused by excessive failure of local desiccant.

[0030] As a further embodiment of the present invention, two vertical plates 21 are fixed to the bottom surface of the drying tank 11. The top ends of the two vertical plates 21 pass through the spiral blades 20 and the partition 17 and extend out. A plurality of air holes 22 are evenly opened on the surface of the vertical plates 21.

[0031] Specifically, when using color-changing desiccant, it is necessary to judge the replacement time by its color change layer by layer, so the stability of the desiccant is very important. During the replacement process, for example, when the upper drying tank 11 descends, the desiccant may vibrate, causing the vertical displacement of the desiccant in each layer, thereby affecting the accuracy of the color change judgment. The present invention can solve the above problem. The specific working method is as follows: by setting a vertical plate 21 through the spiral blade 20 in the vertical direction, the spiral channel formed by the spiral blade 20 is divided into multiple independent separation spaces. Under the physical barrier effect of the vertical plate 21, the desiccant in each separation space can only move within its respective closed area even if it is affected by external vibrations, thereby greatly reducing the vertical displacement of the desiccant across layers and avoiding color change judgment errors caused by large-scale position changes. In addition, in order to ensure the airflow efficiency of the drying system, a plurality of air holes 22 are evenly opened on the surface of the vertical plate 21 to ensure that the dry airflow passes smoothly through the separation area.

[0032] As a further implementation scheme of the present invention, a sliding cavity 23 is provided inside the vertical plate 21, and the bottom of the sliding cavity 23 passes through the vertical plate 21 and the drying tank 11. The sliding plate 24 is slidably connected to the inside of the sliding cavity 23, and a first spring 25 is fixed between the top surface of the sliding plate 24 and the sliding cavity 23. An air permeable groove 26 is provided on the surface of the sliding plate 24, and a limited shrinkage hole 27 is provided between adjacent air permeable grooves 26. A limited shrinkage tube 28 is fixed in the limited shrinkage hole 27. The spiral blade 20 divides the vertical plate 21 into multiple processing sections. The aperture of the limited shrinkage tube 28 in each processing section is the same and the aperture increases along the height direction of the processing section. A raised strip 29 is fixed on the support plate 7, and the raised strip 29 is inserted into the interior of the sliding cavity 23.

[0033] Specifically, when the adsorption force is large, the airflow rises faster along the spiral channel, and it may be difficult to uniformly contact the desiccant in each separated area. In order to improve the uniformity, the present invention provides a sliding plate 24 in the sliding cavity 23, and provides a shrinkage hole 27 and a shrinkage tube 28 on the sliding plate 24, so that the shrinkage hole 27 is connected to the air vent 22. Since the spiral blades 20 divide the vertical plate 21 into a plurality of processing sections of different heights, separation areas are naturally formed between adjacent processing sections. When the airflow moves in the spiral channel, it will pass through different processing sections in turn. The aperture of the shrinkage tube 28 on the processing section increases in turn, thereby forming a throttling effect in each separated area. Through this throttling effect, the residence time of the gas in each separated area is increased, thereby creating favorable conditions for sufficient contact between the gas and the desiccant, ensuring that the gas can uniformly contact the desiccant in each separated area, and effectively improving the drying efficiency and effect. As for the drying tank 11 located above, since the amount of moist air entering it is relatively small, a throttling effect is not necessary; normal air flow is sufficient. Under normal operating conditions, the elastic force of the first spring 25 keeps the bottom surface of the sliding plate 24 flush with the bottom surface of the drying tank 11. At this point, the air holes 22 are connected to the air grooves 26. This connection ensures uniform airflow through the upper drying tank 11, satisfying the required air flow without unnecessary airflow obstruction, ensuring smooth operation of the entire drying system. Let's take a look at the drying tank 11 located below. Its working principle is different from that of the above. Since the raised strip 29 on the support plate 7 is inserted into the sliding cavity 23, the raised strip 29 will push the sliding cylinder upward. In this process, the first spring 25 is compressed. As the sliding cylinder moves upward, the air groove 26 and the air hole 22 gradually lose the connection state, and the limiting hole is connected to the air hole 22. The limiting ring in the limiting hole can effectively limit the aperture. Combined with the design of the aperture of the upper limit reduction tube 28 of each processing section increasing in sequence, the function of forming a throttling effect in each separated area is successfully realized. This design is conducive to ensuring that the gas in the drying tank 11 below can fully and evenly contact the desiccant, and can ensure the stability and efficiency of the drying process even under complex working conditions such as large adsorption force.

[0034] As a further embodiment of the present invention, the shrinkage tube 28 includes an inner tube 30 and an outer tube 31, a support frame 32 is fixed between the inner tube 30 and the outer tube 31, and an installation cavity 33 is provided between the inner tube 30 and the outer tube 31. A first sealing ring 34 and a second sealing ring 35 are provided in the installation cavity 33, and the first sealing ring 34 and the second sealing ring 35 are respectively sealed at both ends of the installation cavity 33. A connecting rod 36 is fixed between the first sealing ring 34 and the second sealing ring 35, and the connecting rod 36 is slidably connected to the support frame 32. An elastic support component is provided between the first sealing ring 34 and the inner wall of the installation cavity 33.

[0035] Specifically, when the lower layer of desiccant is saturated with moisture, it may break under the action of airflow. The generated dust will easily block the flow hole 18 in the middle of the limit ring when it flows with the airflow in the spiral channel. To solve this problem, this embodiment improves the structure of the limit ring, opens an annular installation cavity 33 inside the limit ring body, and arranges a first sealing ring 34 and a second sealing ring 35 on the upstream and downstream sides of the installation cavity 33 respectively, and realizes the dynamic positioning of the sealing ring through the elastic support component. In normal working state, the elastic support assembly provides initial pre-tightening force, so that the first sealing ring 34 and the second sealing ring 35 fit the end surface of the installation cavity 33, forming a reliable seal, effectively preventing dust from entering the installation cavity 33. At this time, the air flow only flows stably through the main flow hole 18 in the middle of the limit ring, meeting the normal ventilation requirements of the system. When dust accumulates in the main flow hole 18, causing blockage, a pressure differential forms upstream and downstream of the hole. As this pressure differential increases to exceed the preload of the elastic support assembly, the airflow pressure pushes the first and second sealing rings 34 and 35 to simultaneously compress the elastic assembly, freeing the sealing rings from the blockage on the end face of the mounting cavity 33 and opening the upstream and downstream passages of the mounting cavity 33. At this point, air can continue to flow through the parallel flow channel formed by the mounting cavity 33 and the main hole, effectively alleviating the blockage problem and ensuring the continuous operation of the system.

[0036] As a further embodiment of the present invention, the elastic support assembly includes a moisture absorbing block 37 , one end of which is fixed to the first sealing ring 34 , and a second spring 38 is fixed between the other end of the moisture absorbing block 37 and the mounting cavity 33 .

[0037] Specifically, during the exhalation process of the transformer, since the elastic force of the second spring 38 needs to be continuously overcome and the air pressure is difficult to maintain stable, intermittent airflow may occur. The present invention can solve the above problem. The specific working method is as follows: in the initial state, the second spring 38 is at its original length. By providing a moisture-absorbing block 37 between the second spring 38 and the first sealing ring 34, the moisture-absorbing block 37 becomes soft or breaks after absorbing moisture, providing a clearance distance for the movement of the first sealing ring 34. Within the clearance distance, the first sealing ring 34 does not need to overcome the elastic force of the second spring 38, thereby ensuring that the installation cavity 33 can maintain a stable open state and the stability of the airflow; It should be noted that the moisture absorbing block 37 can be made of a desiccant material, such as quicklime, which breaks after absorbing moisture, thereby providing a clearance distance. The moisture absorbing block 37 can also be made of other reusable hydrophilic materials, which becomes soft after absorbing moisture, provides a clearance distance, and restores its rigid state after drying.

[0038] As a further embodiment of the present invention, the installation cavity 33 includes an expansion cavity 39 and two blocking cavities 40 . The two blocking cavities 40 are arranged on both sides of the expansion cavity 39 . The inner diameter of the blocking cavity 40 is smaller than the inner diameter of the expansion cavity 39 .

[0039] Specifically, since the inner diameter of the blocking chamber 40 is smaller than the inner diameter of the expansion chamber 39, after the first sealing ring 34 leaves the blocking chamber 40 and enters the expansion chamber 39, there is a larger gap between the first sealing ring 34 and the inner wall of the expansion chamber 39, thereby ensuring the passage of air flow. Moreover, due to the unstable air pressure, under the action of air pressure and the elastic force of the spring, the first sealing ring 34 will move a short distance in the expansion chamber 39, producing a shaking effect, which can further prevent dust from clogging the expansion chamber 39.

[0040] As a further embodiment of the present invention, guide grooves 41 are provided on the side walls of the two blocking cavities 40 , and the guide grooves 41 are connected to the interior of the expansion cavity 39 .

[0041] Specifically, in the above embodiment, the moisture-absorbing block 37 absorbs moisture and breaks to provide a clearance distance to ensure the stability of the airflow. However, when the gas initially enters the expansion chamber 39, due to the small initial air intake volume, it is difficult for the moisture-absorbing block 37 to quickly absorb moisture and break to provide a clearance distance. For this reason, the present invention provides a guide groove 41 on the side wall of the sealing chamber 40, so that the first sealing ring 34 only needs to move a small distance to achieve communication between the expansion chamber 39 and the outside. This design is conducive to ensuring the stable entry of the airflow into the expansion chamber 39, while prompting the moisture-absorbing block 37 to quickly break and provide a clearance distance.

[0042] As a further embodiment of the present invention, an oil seal tank 42 is fixed to the bottom of the support plate 7, a baffle 43 is fixed inside the oil seal tank 42, an air inlet hole 44 is opened on the surface of the oil seal tank 42, a breathable mesh plate 45 is fixed to the bottom of the baffle 43, the interior of the oil seal tank 42 is filled with oil, the top surface of the oil submerges the breathable mesh plate 45, and the elastic pipe of the intake valve 10 is connected to the interior of the oil seal tank 42.

[0043] Specifically, the outside air enters from the air inlet 44, and under the obstruction of the baffle 43, it will pass through the oil and then enter the elastic pipe of the air inlet valve 10. The oil barrier can prevent dust and other impurities in the outside air from entering, which is conducive to ensuring the cleanliness of the incoming gas.

[0044] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention as claimed.

Claims

1. A low-noise oil-immersed transformer, comprising a transformer body, an oil pillow fixedly connected to the top surface of the transformer body, and a breathing duct fixedly connected to the bottom of the oil pillow, characterized in that: Also includes: An air guide tank, the top of which is fixedly connected to the breathing duct, and an exhaust valve is provided on the surface of the air guide tank; A slide rail, the slide rail is fixed to the bottom of the gas guide tank, and a support plate is fixed to the bottom of the slide rail; Two docking plates, both of which are vertically slidably connected to the slide rail, with an air outlet valve and an air inlet valve fixed to the surfaces of the two docking plates from top to bottom, the air inlet valve being connected to the space below the slide rail through an elastic pipe, and the air outlet valve being connected to the air guide tank through an elastic pipe; Two drying cans are stacked up and down on the support plate, and the drying cans are magnetically connected to the docking plate via a magnetic assembly. Two docking holes are provided on the side walls of the drying cans, and the two docking holes are respectively connected to the air inlet valve and the air outlet valve. The top and bottom surfaces of the drying cans are both provided with connecting grooves, and the connecting groove at the bottom of the upper drying can is connected to the connecting groove at the top of the lower drying can.

2. The low-noise oil-immersed transformer according to claim 1, characterized in that: The magnetic attraction component includes a mounting groove, which is opened on the docking plate. A magnet is fixed inside the mounting groove. An insertion block is fixed on the surface of the drying tank. The insertion block is made of ferromagnetic material and is inserted into the mounting groove.

3. The low-noise oil-immersed transformer according to claim 1, characterized in that: Two partitions are fixed inside the drying tank. Through holes are opened on the surfaces of the two partitions. Support nets are fixed in the through holes. A spiral blade is arranged between the two partitions.

4. The low-noise oil-immersed transformer according to claim 3, characterized in that: Two vertical plates are fixed on the bottom surface of the drying tank. Top ends of the two vertical plates penetrate the spiral blades and the partition plate and extend out. A plurality of air holes are evenly opened on the surfaces of the vertical plates.

5. The low-noise oil-immersed transformer according to claim 4, characterized in that: A sliding cavity is provided inside the vertical plate, and the bottom of the sliding cavity passes through the vertical plate and the drying tank. A sliding plate is slidably connected to the inside of the sliding cavity. A first spring is fixed between the top surface of the sliding plate and the sliding cavity. An air permeable groove is provided on the surface of the sliding plate, and limited shrinkage holes are provided between adjacent air permeable grooves. Limited shrinkage tubes are fixed in the limited shrinkage holes. The spiral blades divide the vertical plate into multiple processing sections. The aperture of the limited shrinkage tube in each processing section is the same and the aperture increases along the height direction of the processing section. A raised strip is fixed on the support plate, and the raised strip is inserted into the interior of the sliding cavity.

6. The low-noise oil-immersed transformer according to claim 5, characterized in that: The shrinkage tube includes an inner tube and an outer tube, a support frame is fixed between the inner tube and the outer tube, an installation cavity is provided between the inner tube and the outer tube, a first sealing ring and a second sealing ring are provided in the installation cavity, the first sealing ring and the second sealing ring are respectively sealed at both ends of the installation cavity, a connecting rod is fixed between the first sealing ring and the second sealing ring, the connecting rod is slidably connected to the support frame, and an elastic support component is provided between the first sealing ring and the inner wall of the installation cavity.

7. The low-noise oil-immersed transformer according to claim 6, characterized in that: The elastic support assembly includes a moisture absorbing block, one end of the moisture absorbing block is fixed to the first sealing ring, and a second spring is fixed between the other end of the moisture absorbing block and the installation cavity.

8. The low-noise oil-immersed transformer according to claim 7, characterized in that: The installation cavity includes an expansion cavity and two blocking cavities. The two blocking cavities are arranged on both sides of the expansion cavity. The inner diameter of the blocking cavity is smaller than the inner diameter of the expansion cavity.

9. The low-noise oil-immersed transformer according to claim 8, characterized in that: A guide groove is provided on the side walls of the two blocking cavities, and the guide groove is communicated with the interior of the expansion cavity.

10. The low-noise oil-immersed transformer according to claim 1, characterized in that: An oil seal tank is fixed to the bottom of the support plate, a baffle is fixed inside the oil seal tank, an air inlet hole is opened on the surface of the oil seal tank, a breathable mesh is fixed to the bottom of the baffle, the interior of the oil seal tank is filled with oil, the top surface of the oil submerges the breathable mesh, and the elastic pipe of the air inlet valve is connected to the interior of the oil seal tank.

Images