Large water-cooled transformer and its cooling method

Abstract

The application discloses a large water-cooled transformer and a cooling method thereof, and relates to the technical field of transformers, which comprises a transformer body and a cooling tower. A heat exchange chamber is arranged at the bottom of the transformer body, and an S-shaped pipe is arranged in the heat exchange chamber. The main structure comprises the transformer body and the cooling tower. A composite cooling assembly is arranged in the cooling tower. The disc-shaped pipe arranged at the bottom of the transformer body carries the heat of the hydraulic oil to the spiral pipe in the cooling tower. The composite cooling assembly sprays rainwater to the outer wall of the spiral pipe, and the water takes away a large amount of heat when contacting the pipe wall. The high specific heat capacity of the water is used to realize efficient cooling, especially in the rainy season or humid environment. The energy-saving and environment-friendly composite cooling assembly is used. On the other hand, the cold air is drawn to the vicinity of the spiral pipe to form air flow, thereby enhancing the surface heat exchange. The water cooling and air cooling simultaneously act on the spiral pipe to form forced convection and cooling water film cooperative cooling, thereby greatly improving the heat exchange rate, and the long-term stable operation of the transformer is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a large water-cooled transformer and a cooling method thereof. Background Art

[0002] A transformer is an electrical device used for voltage conversion and is widely used in power systems to transmit and distribute electrical energy. It primarily consists of an iron core and windings and operates on the principle of electromagnetic induction. Transformers generate significant heat during operation, requiring effective heat dissipation to ensure safe and stable operation. Common oil-immersed transformers are filled with insulating hydraulic oil, which circulates internally, transferring heat generated by the windings and core to external cooling fins. Heat is then dissipated through natural or forced air cooling, thereby achieving temperature control and equipment protection.

[0003] Ordinary transformers generate less heat during operation. The heat is transferred to the cooling fins through hydraulic oil, and the heat dissipation requirements can be met with the help of natural air cooling or forced air cooling. In the existing technology, for large transformers, their load is high and the heat generation is large. The traditional heat dissipation method of hydraulic oil and cooling fins is difficult to quickly and effectively discharge the internal heat. Especially in high temperature environments or continuous heavy load conditions, the heat dissipation efficiency is obviously insufficient, which can easily lead to excessive temperature, thereby affecting the insulation performance, operating stability and service life of the transformer. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that for large transformers, which have high loads and high heat generation, the traditional heat dissipation method of hydraulic oil and heat dissipation fins is difficult to quickly and effectively discharge the internal heat. In particular, in high temperature environments or continuous heavy load conditions, the heat dissipation efficiency is obviously insufficient, which easily leads to excessive temperature, thereby affecting the insulation performance, operating stability and service life of the transformer. A large water-cooled transformer and a cooling method thereof are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A large water-cooled transformer comprises a transformer body and a cooling tower. A heat exchange chamber is provided at the bottom of the transformer body. An S-shaped tube is provided inside the heat exchange chamber. Cooling water flowing through the S-shaped tube exchanges heat with transformer oil inside the heat exchange chamber.

[0007] A spiral tube is vertically arranged inside the cooling tower. The spiral tube is connected to an S-shaped tube through a top tube and a bottom pump to form a loop. A composite cooling assembly is provided on the cooling tower. The composite cooling assembly sprays rainwater onto the outer wall of the spiral tube and simultaneously guides cold air to the vicinity of the spiral tube.

[0008] The side wall of the transformer body is fixedly provided with a rain collecting hopper, and the outer wall of the cooling tower in the inner cavity of the rain collecting hopper is equidistantly provided with water inlet holes. Rainwater inside the rain collecting hopper flows into the cooling tower through the water inlet holes. A bottom ring is fixedly provided at the bottom of the cooling tower through a docking column, and the gap between the top of the bottom ring and the bottom of the cooling tower serves as an air inlet channel for the cooling tower.

[0009] A water collecting bucket is fixedly provided at the bottom of the bottom ring, and a composite filter component is provided on the outer wall of the cooling tower. The composite filter component intercepts garbage in rainwater and dust in the air; a composite backflush component is provided on the outer wall of the cooling tower. The composite backflush component regularly blows high-pressure gas into the holes of the composite filter component.

[0010] Optionally, the composite cooling assembly includes an exhaust fan, a water-blocking paper plate, and a spray ring. A spray ring is fixedly provided on the inner wall of the cooling tower. A horizontal rod is fixedly provided on the side of the spray ring. A circulating water pump is fixedly provided on the top of the horizontal rod. The water outlet of the circulating water pump is fixedly connected to the spray ring, and a vertical pipe is fixedly provided on the water inlet of the circulating water pump.

[0011] Optionally, an air gathering hopper is fixedly connected to the top of the cooling tower, a rain shield is provided on the top of the air gathering hopper, a horizontal frame is fixedly provided on the top of the air gathering hopper, an exhaust fan is fixedly provided in the middle position of the horizontal frame, and a water-blocking paper plate is fixedly provided below the exhaust fan of the air gathering hopper.

[0012] Optionally, the composite filter assembly includes a top sealing ring, a top blocking ring, a bottom sealing ring, a switching cylinder, and a horizontal U-rod. A sewage collecting hopper is fixedly installed at the bottom of the water collecting hopper, a switching cylinder is vertically fixed inside the sewage collecting hopper, a horizontal U-rod is fixedly installed at the output end of the switching cylinder, and a top blocking ring is fixedly installed on the top of the horizontal U-rod.

[0013] Optionally, a top sealing ring is fixedly provided on the top of the top baffle ring, the side wall of the top baffle ring is arranged as an inclined surface, the top baffle ring is provided with water retaining holes equidistantly on the inclined surface, the top sealing ring is movably inserted into the rain collecting hopper, a bottom sealing ring is fixedly provided on the bottom of the horizontal U-bar, the bottom sealing ring is sleeved on the outer wall of the cooling tower, and the outer wall of the bottom sealing ring is provided with ash retaining holes equidistantly.

[0014] Optionally, the composite back-blow assembly includes a first back-blow ring, a second back-blow ring, a common pipe and an air source supply assembly. The cooling tower is provided with an annular groove below the water inlet, the first back-blow ring is fixedly installed inside the annular groove, the second back-blow ring is sleeved on the outer wall of the bottom ring, back-blow holes are equidistantly arranged on the outer walls of the first back-blow ring and the second back-blow ring, the bottom of the first back-blow ring is fixedly connected to one end of the common pipe, and the bottom of the second back-blow ring is fixedly connected to the other end of the common pipe.

[0015] Optionally, the air source supply assembly includes a cache air pump, a gas storage ball, and an air supply hose. The air inlet end of the cache air pump is fixedly connected to the inner cavity of the cooling tower, the air outlet end of the cache air pump is fixedly connected to the gas storage ball, and the air outlet end of the cache air pump is provided with a one-way valve.

[0016] Optionally, one end of the air supply hose is fixedly connected to the common pipe, and the other end of the air supply hose is provided with an automatic release component, which automatically supplies high-pressure gas to the composite backflush component when the composite filter component is backflushed.

[0017] Optionally, the automatic release assembly includes a release tube, a fixed tube, and a driven column, one end of the driven column is fixedly connected to the side wall of the top blocking ring, and the other end of the driven column is fixedly connected to the side of the release tube.

[0018] Optionally, the fixing tube is fixedly connected to the inner cavity of the ball storage ball, the release tube extends into the interior of the fixing tube, and a release hole is provided on the side of the fixing tube.

[0019] Optionally, one end of the S-shaped tube is fixedly connected to the water inlet of the bottom pump, the water outlet of the bottom pump is fixedly connected to the bottom end of the spiral tube, the top end of the spiral tube is fixedly connected to one end of the top tube, and the other end of the top tube is fixedly connected to the S-shaped tube.

[0020] A cooling method for a large water-cooled transformer comprises the following steps:

[0021] S1, the composite cooling assembly works, cooling water takes away the heat of the hydraulic oil when flowing through the coiled pipe, cooling water flows through the spiral pipe to exchange heat with the composite cooling assembly, and the composite filter assembly intercepts garbage in rainwater and dust carried by air entering the cooling tower;

[0022] In S2, the composite filter assembly moves down along the outer wall of the cooling tower, and the automatic release assembly supplies high-pressure gas to the composite backflush assembly. The cooling tower stops entering rainwater and cooling air, and the garbage and dust intercepted by the composite backflush assembly are blown away.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. The main structure of the present invention includes a transformer body and a cooling tower, and a composite cooling component is provided inside the cooling tower. The disc pipe arranged at the bottom of the transformer body brings the heat of the hydraulic oil to the spiral tube inside the cooling tower. The composite cooling component is used to spray rainwater onto the outer wall of the spiral tube. When the water contacts the tube wall, a large amount of heat is taken away. The high specific heat capacity of water is used to achieve efficient cooling, which is particularly suitable for rainy seasons or humid environments. It is energy-saving and environmentally friendly. On the other hand, by pumping cold air to the vicinity of the spiral tube, air flow is formed, and surface heat exchange is enhanced. Water cooling and air cooling act on the spiral tube at the same time, forming forced convection and cooling water film to synergize cooling, greatly improving the heat exchange rate, avoiding overheating of the hydraulic oil, and thus ensuring long-term stable operation of the transformer.

[0025] 2. The present invention is provided with a rain collecting hopper on the outer wall of the cooling tower, which guides rainwater into the interior of the cooling tower, and an air intake channel is provided at the bottom of the cooling tower to allow cooling air to enter the interior of the cooling tower, and a composite filter assembly is provided on the outer wall of the cooling tower to prevent garbage in the rainwater or dust in the cooling gas from being introduced into the interior of the cooling tower, thereby preventing these pollutants from entering the interior of the cooling tower and clogging the spray system or adhering to the wall of the heat exchange tube, thereby reducing the cooling efficiency and even causing malfunctions.

[0026] 3. The outer wall of the cooling tower of the present invention is provided with a composite back-flush component. The composite filter component can be moved to the outer wall of the composite back-flush component at regular intervals. The back-flush airflow will automatically blow off pollutants such as dust and leaves accumulated on the surface of the filter screen without manual disassembly or cleaning, which greatly improves the maintenance efficiency. Regular automatic cleaning can keep the composite filter component always permeable, avoiding water or air inflow into the cooling tower due to decreased filtering capacity, thereby ensuring the continuous and efficient operation of rainwater utilization and air heat exchange process. The automated cleaning process reduces the frequency of manual maintenance, especially in the operation scenario of large transformers, which can reduce downtime and labor costs.

[0027] 4. One of the composite back-blowing components of the present invention is an air source supply component, and one of the air source supply components is an automatic release component. The air source supply component caches a certain amount of clean gas when the transformer is cooling the entire cooling tower. When the composite filter component moves to the position of the composite back-blowing component, the automatic release component obtains high-pressure air from the air source supply component and provides it to the composite back-blowing component. The air source supply component caches a certain amount of clean gas to avoid the reaction delay that may be caused by temporarily starting the air pump. Once the filter component moves to the back-blowing position, the automatic release component immediately starts high-pressure gas back-blowing to ensure that the dust cleaning action is rapid, the pressure is sufficient, and the cleaning effect is reliable. In addition, the automatic release component adopts a purely mechanical structure and can accurately identify the position and release the high-pressure air source without relying on the electronic control system, avoiding back-blowing failure due to electrical failure, control error or external interference, thereby improving the stability and safety of the overall cooling system. It is particularly suitable for transformer sites that are unattended for a long time under high voltage, outdoor or harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 for Figure 1 Another perspective structural diagram.

[0030] Figure 3 It is a structural diagram of the cooling tower and its connecting parts.

[0031] Figure 4 Schematic diagram of the structure for removing the rain collecting hopper from the cooling tower.

[0032] Figure 5 for Figure 4 Schematic diagram of the structure of removing the composite backflush component.

[0033] Figure 6 This is a front half-section view of the cooling tower.

[0034] Figure 7 This is a structural view of the composite filtering component.

[0035] Figure 8 This is a schematic diagram of the half-section structure of the top retaining ring from the front.

[0036] Figure 9 This is a schematic diagram of the connection structure between the composite backflush component and the gas supply component.

[0037] Figure 10 It is a structural diagram of the automatic air supply component.

[0038] Figure 1: Transformer body; 2: Heat exchange chamber; 3: S-shaped pipe; 4: Top pipe; 5: Dirt collecting hopper; 6: Bottom pump; 7: Rain collecting hopper; 8: Rain shield; 9: Gas collecting hopper; 10: Water inlet; 11: Cooling tower; 110: Annular groove; 111: Receiving groove; 12: Docking column; 13: Bottom ring; 14: Water collecting hopper; 141: Water supply valve; 142: Liquid level sensor; 15: Horizontal frame; 16: Circulating water pump; 17: Horizontal rod; 18: Vertical pipe; 19: Spiral pipe; 20: , exhaust fan; 21. Water-blocking paper plate; 22. Spray ring; 221. Spray pipe; 23. Top sealing ring; 24. Water-blocking hole; 25. Top blocking ring; 26. Horizontal U-bar; 27. Switching cylinder; 28. Driven column; 29. ​​Bottom sealing ring; 291. Ash-blocking hole; 30. Buffer air pump; 31. One-way valve; 32. Ball storage ball; 33. Release pipe; 34. Air supply hose; 35. Common pipe; 351. First back-blow ring; 352. Second back-blow ring; 36. Fixed cylinder; 361. Release hole. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0041] Reference Figure 1-10 A large water-cooled transformer and a cooling method thereof include a transformer body 1 and a cooling tower 11. A heat exchange chamber 2 is provided at the bottom of the transformer body 1. An S-shaped tube 3 is provided inside the heat exchange chamber 2. The heat exchange chamber 2 is filled with transformer oil. The cooling water flowing through the S-shaped tube 3 exchanges heat with the transformer oil inside the heat exchange chamber 2.

[0042] A spiral tube 19 is arranged vertically inside the cooling tower 11. The spiral tube 19 is connected to the S-shaped tube 3 through the top pipe 4 and the bottom pump 6 to form a loop. One end of the S-shaped tube 3 is fixedly connected to the water inlet end of the bottom pump 6, and the water outlet end of the bottom pump 6 is fixedly connected to the bottom end of the spiral tube 19. The top of the spiral tube 19 is fixedly connected to one end of the top pipe 4, and the other end of the top pipe 4 is fixedly connected to the S-shaped tube 3. A composite cooling component is provided on the cooling tower 11. The composite cooling component sprays rainwater onto the outer wall of the spiral tube 19 and at the same time draws cold air to the vicinity of the spiral tube 19. An air collecting hopper 9 is fixedly connected to the top of the cooling tower 11. A rain shield 8 is provided on the top of the air collecting hopper 9 to prevent unfiltered rainwater from entering the interior of the cooling tower 11. The rain shield 8 includes a cap body and columns. The columns are symmetrically arranged at the bottom of the cap body, and the columns are fixedly arranged on the top of the air collecting hopper 9 so that the air collecting hopper 9 can be exhausted normally.

[0043] A horizontal frame 15 is fixedly provided on the top of the gas gathering hopper 9, and an exhaust fan 20 is fixedly provided in the middle position of the horizontal frame 15. A water-blocking paper plate 21 is fixedly provided on the gas gathering hopper 9 below the exhaust fan 20. The water-blocking paper plate 21 is honeycomb-shaped and intercepts the droplets discharged from the top of the gas gathering hopper 9 as much as possible to save water resources. When the bottom of the water-blocking paper plate 21 absorbs enough droplets, the droplets will fall back to the bottom of the cooling tower 11 due to gravity. The direction of the exhaust fan 20 needs to be set appropriately. When the exhaust fan 20 rotates, the air inside the cooling tower 11 will be drawn away from the gas gathering hopper 9.

[0044] A rain collecting hopper 7 is fixedly provided on the side wall of the transformer body 1, and water inlet holes 10 are equidistantly provided on the outer wall of the cooling tower 11 in the inner cavity of the rain collecting hopper 7. Rainwater inside the rain collecting hopper 7 flows into the cooling tower 11 through the water inlet holes 10. A bottom ring 13 is fixedly provided at the bottom of the cooling tower 11 through a docking column 12. There are three docking columns 12 in total. The gap between the top of the bottom ring 13 and the bottom of the cooling tower 11 serves as an air inlet channel for the cooling tower 11.

[0045] A water collecting bucket 14 is fixedly provided at the bottom of the bottom ring 13. The composite cooling assembly includes an exhaust fan 20, a water-blocking paper plate 21, and a spray ring 22. The spray ring 22 is fixedly provided on the inner wall of the cooling tower 11. A horizontal rod 17 is fixedly provided on the side of the spray ring 22. A circulating water pump 16 is fixedly provided on the top of the horizontal rod 17. The water outlet end of the circulating water pump 16 is fixedly connected to the spray ring 22. A vertical pipe 18 is fixedly provided at the water inlet end of the circulating water pump 16. The bottom of the vertical pipe 18 extends into the bottom of the inner cavity of the water collecting bucket 14.

[0046] The circulating water pump 16 pumps the rainwater inside the water collecting bucket 14 to the spray ring 22 through the vertical pipe 18. The spray ring 22 is a hollow tube, and the openings of the circular array of spray pipes 221 at the bottom of the spray ring 22 are tilted downward. The diameter of the spray pipe 221 is set to be small, and the rainwater is sprayed onto the outer wall of the spiral tube 19. A water supply valve 141 and a liquid level sensor 142 are sequentially provided at the bottom of the side of the water collecting bucket 14. The water supply valve 141 is connected to the city's water supply system. When the liquid level sensor 142 senses that the liquid level inside the water collecting bucket 14 is insufficient, the water supply valve 141 opens to pump water into the water collecting bucket 14 to ensure that there is enough spray water inside the water collecting bucket 14 during the dry season.

[0047] A composite filter assembly is provided on the outer wall of the cooling tower 11, which intercepts garbage in rainwater and dust in the air. The composite filter assembly includes a top sealing ring 23, a top blocking ring 25, a bottom sealing ring 29, a switching cylinder 27, and a horizontal U-rod 26. A sewage hopper 5 is fixedly provided at the bottom of the water collecting hopper 14, and a switching cylinder 27 is fixed vertically inside the sewage hopper 5. A horizontal U-rod 26 is fixedly provided at the output end of the switching cylinder 27, and a top blocking ring 25 is fixedly provided on the top of the horizontal U-rod 26. A top sealing ring 23 is fixedly provided on the top of the top blocking ring 25, and the side wall of the top blocking ring 25 is provided with an inclined surface. When the top blocking ring 25 is removed from the inner wall of the rain collecting hopper 7, the setting of the inclined surface makes it convenient for the large garbage intercepted by the inclined surface of the top blocking ring 25 to automatically fall to the top of the sewage hopper 5 due to gravity, thereby avoiding insufficient air pressure of the composite backflush assembly causing large garbage to be trapped on the top of the inclined surface.

[0048] The top retaining ring 25 is provided with water retaining holes 24 at equal intervals on the inclined surface. The water retaining hole 24 includes a water section and an inclined section. The horizontal section of the water retaining hole 24 is aligned and connected with one end of the water inlet hole 10. The top sealing ring 23 is movably inserted into the rain collecting hopper 7. A bottom sealing ring 29 is fixedly provided at the bottom of the horizontal U-bar 26. The bottom sealing ring 29 is sleeved on the outer wall of the cooling tower 11. The outer wall of the bottom sealing ring 29 is provided with ash retaining holes 291 at equal intervals. The outer wall of the cooling tower 11 is provided with a composite backflush component. The composite backflush component regularly blows high-pressure gas into the holes of the composite filter component.

[0049] The composite backflush assembly includes a first backflush ring 351, a second backflush ring 352, a common pipe 35 and an air supply assembly. The cooling tower 11 is provided with an annular groove 110 below the water inlet 10, and the first backflush ring 351 is fixedly arranged inside the annular groove 110. The cooling tower 11 is provided with a receiving groove 111 at the bottom of the annular groove 110. The receiving groove 111 is used to accommodate the common pipe 35. The outer wall of the bottom ring 13 is provided with a second backflush ring 352. At this time, the outer wall of the second backflush ring 352 is flush with the outer wall of the cooling tower 11. Backflush holes are equidistantly provided on the outer walls of the first backflush ring 351 and the second backflush ring 352. The bottom of the first backflush ring 351 is fixedly connected to one end of the common pipe 35, and the bottom of the second backflush ring 352 is fixedly connected to the other end of the common pipe 35.

[0050] The gas source supply assembly includes a cache air pump 30, a gas storage ball 32, and an air supply hose 34. The air inlet end of the cache air pump 30 is fixedly connected to the inner cavity of the cooling tower 11, and the air outlet end of the cache air pump 30 is fixedly connected to the gas storage ball 32. A one-way valve 31 is provided at the air outlet end of the cache air pump 30. The one-way flow direction of the gas inside the one-way valve 31 needs to be set appropriately. The cache air pump 30 can only blow gas into the gas storage ball 32. One end of the air supply hose 34 is fixedly connected to the common pipe 35.

[0051] An automatic release component is provided at the other end of the air supply hose 34. The automatic release component automatically supplies high-pressure gas to the composite back-blowing component when the composite filter component is back-blown. The automatic release component includes a release tube 33, a fixed cylinder 36, and a driven column 28. One end of the driven column 28 is fixedly connected to the side wall of the top blocking ring 25, and the other end of the driven column 28 is fixedly connected to the side of the release tube 33. The fixed cylinder 36 is fixedly connected to the inner cavity of the gas storage ball 32. The release tube 33 extends into the interior of the fixed cylinder 36. A release hole 361 is provided on the side of the fixed cylinder 36. An opening is provided at the top of the release tube 33. When the release tube 33 moves up to the extreme position, the release tube 33 is not connected to the release hole 361.

[0052] The specific implementation steps and principles of the present invention are as follows:

[0053] When the entire cooling tower 11 is performing cooling work normally, the bottom pump 6 starts to circulate the cooling water inside the S-shaped tube 3 and the spiral tube 19. The cooling water flows through the S-shaped tube 3 and exchanges heat with the transformer oil inside the heat exchange chamber 2. The cooling water carries the heat to the spiral tube 19 inside the cooling tower 11. Rainwater enters the water collecting hopper 14 through the rain collecting hopper 7 and the water inlet 10. Garbage is intercepted by the water blocking hole 24 and the water inlet 10. The ash blocking hole 291 is located on the outer wall of the gap between the bottom of the cooling tower 11 and the top of the bottom ring 13, intercepting the dust carried by the air entering the cooling tower 11.

[0054] The circulating water pump 16 pumps clean rainwater to the spray ring 22 through the vertical pipe 18, and the spray ring 22 sprays it to the outer wall of the spiral tube 19 through the spray pipe 221. At the same time, the exhaust fan 20 arranged on the top of the air gathering hopper 9 draws cold air into the interior of the cooling tower 11 from the gap between the bottom of the cooling tower 11 and the top of the bottom ring 13, and discharges it from the top of the air gathering hopper 9. The buffer air pump 30 obtains clean air from the inside of the cooling tower 11. At this time, the top of the release pipe 33 is closed by the top of the fixed cylinder 36, and the air supply hose 34 is not connected to the air storage ball 32.

[0055] When the switching cylinder 27 is started, the switching cylinder 27 retracts, the top sealing ring 23 moves down to close the water inlet 10, and the bottom sealing ring 29 moves to the gap between the bottom of the cooling tower 11 and the top of the bottom ring 13. At the same time, the top blocking ring 25 moves down to the bottom of the rain collecting hopper 7, and the first backflush ring 351 is on the inner wall of the top blocking ring 25, and the second backflush ring 352 is on the inner wall of the ash blocking hole 291 set in the bottom sealing ring 29. At this time, the release pipe 33 is driven by the driven column 28 to move down to a certain position. At this time, the internal gas of the storage ball 32 supplies high-pressure gas to the first backflush ring 351 and the second backflush ring 352 through the release hole 361, the release pipe 33, the air supply hose 34, and the common pipe 35, to backflush the ash blocking hole 291 and the water blocking hole 24.

[0056] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A large water-cooled transformer, comprising a transformer body and a cooling tower, characterized in that: A heat exchange chamber is provided at the bottom of the transformer body, and an S-shaped tube is provided inside the heat exchange chamber. The cooling water flowing through the S-shaped tube exchanges heat with the transformer oil inside the heat exchange chamber; The cooling tower is provided with a spiral tube in a vertical direction, and the spiral tube is connected with the S-shaped tube through a top tube and a bottom pump to form a loop. The cooling tower is provided with a composite cooling component, and the composite cooling component sprays rainwater onto the outer wall of the spiral tube, and at the same time, draws the cold air to the vicinity of the spiral tube. The composite cooling component includes an exhaust fan, a water-blocking paper disc, and a spray ring. The spray ring is fixedly provided on the inner wall of the cooling tower, a horizontal rod is fixedly provided on the side of the spray ring, a circulating water pump is fixedly provided on the top of the horizontal rod, the water outlet end of the circulating water pump is fixedly connected to the spray ring, and the water inlet end of the circulating water pump is fixedly provided with a vertical pipe, which extends to the bottom of the inner cavity of the water collecting hopper. The top of the cooling tower is fixedly connected to an air collecting hopper, and a rain shield is provided on the top of the air collecting hopper, and a horizontal frame is fixedly provided on the top of the air collecting hopper, and an exhaust fan is fixedly provided in the middle position of the horizontal frame, and the air collecting hopper is fixedly provided with a water-blocking paper disc below the exhaust fan. The side wall of the transformer body is fixedly provided with a rain collecting hopper, and the outer wall of the cooling tower in the inner cavity of the rain collecting hopper is equidistantly provided with water inlet holes. Rainwater inside the rain collecting hopper flows into the cooling tower through the water inlet holes. A bottom ring is fixedly provided at the bottom of the cooling tower through a docking column, and the gap between the top of the bottom ring and the bottom of the cooling tower serves as an air inlet channel for the cooling tower. A water collecting hopper is fixedly provided at the bottom of the bottom ring, and a composite filter assembly is provided on the outer wall of the cooling tower. The composite filter assembly intercepts garbage in rainwater and dust in the air. The composite filter assembly includes a closed ring, a top blocking ring, a bottom sealing ring, a switching cylinder, and a horizontal U rod. A dirt collecting hopper is fixedly provided at the bottom of the water collecting hopper, a switching cylinder is vertically fixed inside the dirt collecting hopper, a horizontal U rod is fixedly provided at the output end of the switching cylinder, a top blocking ring is fixedly provided on the top of the horizontal U rod, a top sealing ring is fixedly provided on the top of the top blocking ring, and the bottom sealing ring is sleeved on the outer wall of the cooling tower; The outer wall of the cooling tower is provided with a composite back-blow assembly, and the composite back-blow assembly regularly blows high-pressure gas into the holes of the composite filter assembly. The composite back-blow assembly includes a first back-blow ring, a second back-blow ring, a common pipe and an air source supply assembly. The cooling tower is provided with an annular groove below the water inlet, and the first back-blow ring is fixedly provided inside the annular groove. The outer wall of the bottom ring is provided with a second back-blow ring, and the outer walls of the first back-blow ring and the second back-blow ring are equidistantly provided with back-blow holes, the bottom of the first back-blow ring is fixedly connected to one end of the common pipe, and the bottom of the second back-blow ring is fixedly connected to the other end of the common pipe.

2. A large water-cooled transformer according to claim 1, characterized in that: The side wall of the top retaining ring is set to an inclined surface, and the top retaining ring is provided with water retaining holes at equal distances on the inclined surface. The top sealing ring is movably inserted into the rain collecting hopper, and a bottom sealing ring is fixedly provided at the bottom of the horizontal U rod, and the outer wall of the bottom sealing ring is provided with ash retaining holes at equal distances.

3. A large water-cooled transformer according to claim 2, characterized in that: The gas source supply assembly includes a cache air pump, a gas storage ball, and an air supply hose. The air inlet end of the cache air pump is fixedly connected to the inner cavity of the cooling tower, the air outlet end of the cache air pump is fixedly connected to the gas storage ball, and the air outlet end of the cache air pump is provided with a one-way valve.

4. A large water-cooled transformer according to claim 3, characterized in that: One end of the air supply hose is fixedly connected to the common pipe, and the other end of the air supply hose is provided with an automatic release component, which automatically supplies high-pressure gas to the composite backflush component when the composite filter component is backflushed.

5. A large water-cooled transformer according to claim 4, characterized in that: The automatic release assembly includes a release tube, a fixed tube, and a driven column. One end of the driven column is fixedly connected to the side wall of the top blocking ring, and the other end of the driven column is fixedly connected to the side of the release tube.

6. A large water-cooled transformer according to claim 5, characterized in that: The fixing cylinder is fixedly connected to the inner cavity of the ball storage ball, the release tube extends into the interior of the fixing cylinder, and a release hole is provided on the side of the fixing cylinder.

7. A large water-cooled transformer according to claim 1, characterized in that: One end of the S-shaped tube is fixedly connected to the water inlet end of the bottom pump, the water outlet end of the bottom pump is fixedly connected to the bottom end of the spiral tube, the top end of the spiral tube is fixedly connected to one end of the top tube, and the other end of the top tube is fixedly connected to the S-shaped tube.

8. A cooling method for a large water-cooled transformer, used for a large water-cooled transformer according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, the composite cooling assembly works, cooling water takes away the heat of the hydraulic oil when flowing through the coiled pipe, cooling water flows through the spiral pipe to exchange heat with the composite cooling assembly, and the composite filter assembly intercepts garbage in rainwater and dust carried by air entering the cooling tower; In S2, the composite filter assembly moves down along the outer wall of the cooling tower, and the automatic release assembly supplies high-pressure gas to the composite backflush assembly. The cooling tower stops entering rainwater and cooling air, and the garbage and dust intercepted by the composite backflush assembly are blown away.

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