An oil-immersed transformer easy to maintain

Abstract

The application relates to the technical field of transformers, in particular to an oil-immersed transformer easy to maintain, which comprises an oil tank, a cover plate is arranged above the oil tank, an integrated independent module is connected to the lower surface of the cover plate, the integrated independent module integrates an iron core, a winding and a tapping switch, a scraper assembly is arranged at the bottom of the inner side of the oil tank, a mounting frame horizontally arranged in the oil tank, a floating pad is arranged on the upper surface of the mounting frame, a spraying structure for flushing the integrated independent module is arranged in the inner side of the floating pad, and a driving structure for driving the movement of the scraper assembly is arranged at the lower part of the mounting frame; the floating pad is linked with the oil level, the multistage liquid supply structure, the spraying structure and the scraper assembly are driven to work cooperatively, the automation of oil discharge, flushing and mud scraping is realized, no additional power device and manual intervention are needed, the downtime maintenance time is greatly shortened, the labor intensity is obviously reduced, and the safety hidden danger of high-altitude operation and closed space operation is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformers, in particular to an oil-immersed transformer easy to maintain. BACKGROUND

[0002] As the core equipment of power transmission and conversion in the power system, the oil-immersed transformer will produce sludge, colloid and other impurities due to oxidation and aging of the transformer oil during long-term operation. At the same time, dust, metal particles and other impurities in the external environment will penetrate into the oil. These impurities will not only deposit at the bottom of the transformer to form sludge accumulation, but also adhere to the inner wall, winding surface and core of the transformer, resulting in a decrease in the insulation performance of the transformer oil and the heat dissipation efficiency. In severe cases, it will also cause winding short circuit, local overheating and other faults, threatening the safe operation of the equipment.

[0003] In order to ensure the normal operation of the transformer, the existing technology needs to monitor and replace the transformer oil regularly, and clean and maintain the inside of the equipment. When the oil is replaced, the waste oil needs to be slowly discharged through an external pipeline, and then some parts need to be disassembled to clean the inner wall and the bottom sludge. The process is complicated and time-consuming. Therefore, an oil-immersed transformer easy to maintain is proposed, which can simplify the maintenance process, shorten the downtime maintenance time, reduce the labor intensity, and ensure the cleaning effect. SUMMARY

[0004] In view of the problems in the prior art, the present application provides an oil-immersed transformer easy to maintain, which can simplify the maintenance process, shorten the downtime maintenance time, reduce the labor intensity, and ensure the cleaning effect.

[0005] The technical solution adopted by the present application to solve the technical problem is an oil-immersed transformer easy to maintain, which comprises an oil tank, a cover plate is arranged above the oil tank, an integrated independent module is connected to the lower surface of the cover plate, the integrated independent module integrates an iron core, a winding and a tap changer, a scraper assembly is arranged at the bottom of the inner side of the oil tank, an installation frame is arranged horizontally in the oil tank, a floating pad is arranged on the upper surface of the installation frame, a spraying structure for flushing the integrated independent module is arranged in the inner side of the floating pad, a driving structure for driving the movement of the scraper assembly is arranged at the lower part of the installation frame, a multi-stage liquid supply structure communicated with the spraying structure is connected between the installation frame and the bottom of the oil tank, and a oil discharge structure is arranged at the bottom of the oil tank.

[0006] Specifically, the scraper assembly comprises a cleaning plate vertically arranged at the inner bottom of the oil tank, a round corner is arranged at the lower part of the side of the cleaning plate away from the oil discharge structure, the upper part of the two ends of the cleaning plate is connected with a swing seat, the top of the swing seat is connected with a top rod, the side close to the two swing seats is hingedly connected with a fixing seat through a hinge shaft, a threaded hole is arranged in the fixing seat, a screw rod is threadedly connected in the threaded hole, and the two ends of the screw rod are rotatably connected with the inner wall of the oil tank, and the outer end of one end of the screw rod is fixedly connected with a driving gear.

[0007] Specifically, the driving structure comprises a variable speed gear meshing and driving the driving gear, the variable speed gear is coaxially connected with a transmission shaft, one end of the transmission shaft is fixedly connected with a transmission gear, the other end of the transmission shaft is rotatably connected with the inner wall of the oil tank, the lower surface of the mounting frame is fixedly connected with a vertically arranged rack, and the rack is meshingly and drivingly connected with the transmission gear after moving downward.

[0008] Specifically, the cleaning plate is internally provided with a sealed cavity, the side close to the oil discharge structure of the cleaning plate is provided with a first slot communicated with the sealed cavity, the upper surface of the cleaning plate is provided with a second slot communicated with the sealed cavity, the first slot is sealingly and slidably connected with an adjusting plate, the second slot is sealingly and slidably connected with a baffle, and the side close to the two swing seats is provided with a sliding groove corresponding to the two ends of the second slot.

[0009] Specifically, the spraying structure comprises a mounting plate fixedly connected to the inner side of the floating pad, a spraying plate is fixedly connected to one side of the mounting plate, a plurality of groups of nozzles facing the integrated independent module are arranged on the spraying plate, and the spraying plate is communicated with the multi-stage liquid supply structure.

[0010] Specifically, the multi-stage liquid supply structure comprises a plurality of groups of vertically arranged fixed cylinders, the upper end of the fixed cylinder is fixedly connected with the lower surface of the mounting frame, the fixed cylinder is sealingly and slidably connected with a sliding cylinder, the sliding cylinder is sealingly and slidably connected with an extrusion rod, the fixed cylinder and the sliding cylinder are both conical sliding chambers with large upper part and small lower part, springs are arranged between the upper part of the extrusion rod and the inner side of the sliding cylinder and between the upper part of the sliding cylinder and the inner side of the fixed cylinder, mounting grooves are arranged on the outer side of the upper part of the extrusion rod and the upper part of the sliding cylinder, a plurality of groups of elastic notched rings are arranged in the mounting grooves in a staggered manner, and the elastic notched rings are in sliding contact with the conical sliding chambers.

[0011] The lower end of the extrusion rod is fixedly connected with the inner wall of the oil tank through a connecting seat; the upper end of the fixed cylinder is communicated with a one-way liquid inlet valve and a one-way liquid outlet valve, and the one-way liquid outlet valve is communicated with the corresponding spraying plate through a pipeline.

[0012] Specifically, the oil discharging structure comprises a plurality of groups of oil outlets arranged on the bottom of the oil tank, the oil outlets are fixedly connected with oil outlet pipes, and the lower ends of the oil outlet pipes are in common communication with an oil discharging pipe.

[0013] Specifically, the installation frame is provided with a scraping plate on the side close to the inner wall of the oil tank.

[0014] Specifically, the lower surface of the cover plate is fixedly connected with a detection probe rod for detecting the oil level and the oil temperature in the oil tank, and the upper surface of the cover plate is provided with a detection interface electrically connected with the detection probe rod and used for connecting an external detection device.

[0015] The oil-immersed transformer easy to maintain has the following beneficial effects:

[0016] The oil-immersed transformer easy to maintain has the following beneficial effects:

[0017] The oil-immersed transformer easy to maintain has the following beneficial effects:

[0018] The oil-immersed transformer easy to maintain has the following beneficial effects:

[0019] The oil-immersed transformer easy to maintain has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0020] The application will be further described in combination with the drawings and examples.

[0021] Figure 1 isometric view of the present application;

[0022] Figure 2 isometric view of the internal structure of the oil tank of the present application;

[0023] Figure 3 isometric view of the integrated independent module of the present application;

[0024] Figure 4 isometric view of the multi-stage liquid supply structure and the scraper assembly of the present application;

[0025] Figure 5 is the A area of Figure 4 enlarged view;

[0026] Figure 6 is the B area of Figure 4 enlarged view;

[0027] Figure 7 is the cross-sectional structure of the cleaning plate of the present application;

[0028] Figure 8 is the C area of Figure 7 enlarged view;

[0029] Figure 9 is the cross-sectional structure of the fixed cylinder and the sliding cylinder of the present application;

[0030] Figure 10 is the D area of Figure 9 enlarged view;

[0031] In the figure: 1, oil tank; 2, cover plate; 3, integrated independent module; 4, mounting frame; 5, floating pad; 6, cleaning plate; 7, round corner; 8, swing seat; 9, hinged shaft; 10, fixed seat; 11, screw rod; 12, driving gear; 13, variable speed gear; 14, transmission shaft; 15, transmission gear; 16, rack; 17, sealed cavity; 18, first slot; 19, second slot; 20, adjusting plate; 21, baffle; 22, sliding groove; 23, mounting plate; 24, shower plate; 25, nozzle; 26, fixed cylinder; 27, sliding cylinder; 28, extrusion rod; 29, conical sliding chamber; 30, spring; 31, mounting groove; 32, elastic notched ring; 33, one-way liquid inlet valve; 34, one-way liquid outlet valve; 35, oil outlet; 36, oil outlet pipe; 37, oil discharge pipe; 38, support truss; 39, dirt scraping plate; 40, detection probe; 41, detection interface; 42, connecting seat; 43, ejector rod. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0033] In order to simplify the maintenance process, shorten the downtime maintenance time, reduce the labor intensity, and ensure the cleaning effect, as an embodiment of the present application, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 The oil-immersed transformer easy to maintain comprises an oil tank 1, a cover plate 2 is arranged above the oil tank 1, an integrated independent module 3 is connected to the lower surface of the cover plate 2, the integrated independent module 3 integrates an iron core, a winding and a tap switch, a scraper assembly is arranged at the inner bottom of the oil tank 1, an installation frame 4 is arranged horizontally in the oil tank 1, a floating pad 5 is arranged on the upper surface of the installation frame 4, a spraying structure for flushing the integrated independent module 3 is arranged in the floating pad 5, a driving structure for driving the scraper assembly to move is arranged at the lower part of the installation frame 4, a multi-stage liquid supply structure communicated with the spraying structure is connected between the installation frame 4 and the bottom of the oil tank 1, and a oil discharge structure is arranged at the bottom of the oil tank 1.

[0034] In use, in order to ensure the stable operation of the oil-immersed transformer, qualified transformer oil needs to be injected into the oil tank 1 first, and when the amount of oil injection gradually increases, the floating pad 5 is synchronously moved upward by the buoyancy, driving the installation frame 4 to move horizontally upward; in this process, the multi-stage liquid supply structure acts synchronously, automatically absorbing part of the transformer oil into the inside until the oil level in the oil tank 1 reaches the preset standard, completing the oil injection preparation;

[0035] When the transformer oil needs to be replaced due to long-term operation, the oil discharge structure at the bottom of the oil tank 1 is opened, and the waste oil is orderly discharged along the oil discharge structure, as the oil level gradually decreases, the floating pad 5 is synchronously moved downward with the oil level, thereby driving the multi-stage liquid supply structure to start, the transformer oil stored in the multi-stage liquid supply structure is transported to the spraying structure, and the nozzles 25 of the spraying structure are used to spray the surface of the integrated independent module 3, thereby realizing the flushing of the iron core, the winding and the tap switch, effectively removing the attached impurities and sludge, avoiding the problems of insulation performance reduction, heat dissipation efficiency reduction and the like caused by the attachment of impurities, reducing the risk of winding short circuit, local overheating and the like, and without the need to separately add a cleaning process after discharging the oil, the total maintenance time is greatly shortened;

[0036] When the floating pad 5 is moved to the preset position, the driving structure and the scraper assembly are in transmission cooperation, driving the scraper assembly to translate along the inner bottom of the oil tank 1, and in the moving process, the scraper assembly scrapes and cleans the deposited sludge, and the sludge is pushed to the oil discharge structure, without the need for manual cleaning inside the oil tank 1, avoiding the safety hazards of high-altitude operation and closed space operation, reducing the labor intensity, and at the same time, realizing the synchronous discharge of the sludge and the waste oil, effectively dealing with the pollution of the new oil quality caused by the residual sludge, and ensuring the oil purity of the subsequent equipment operation;

[0037] When the core, winding, tap changer and other components need to be repaired or replaced, the oil tank 1 does not need to be disassembled as a whole, only the cover plate 2 needs to be lifted by lifting equipment, and the integrated independent module 3 is moved out synchronously with the cover plate 2, which simplifies the maintenance process, shortens the downtime maintenance time, reduces the labor intensity, and improves the maintenance convenience and equipment versatility.

[0038] In order to facilitate the scraping of the oil sludge at the bottom of the oil tank 1, as shown in Figure 4 、 Figure 6 The present application also comprises a cleaning plate 6 vertically arranged on the inner bottom of the oil tank 1, a circular corner is arranged on the lower part of the side of the cleaning plate 6 away from the oil discharge structure, the upper parts of both ends of the cleaning plate 6 are connected with swing seats 8, the top of the swing seat 8 is connected with a top rod 43, and the sides close to each other of the two groups of swing seats 8 are hinged with fixed seats 10 through hinge shafts 9, the fixed seat 10 is provided with a threaded hole, the threaded hole is threadedly connected with a screw rod 11, and the two ends of the screw rod 11 are rotatably connected with the inner wall of the oil tank 1. The outer end of one end of the screw rod 11 is fixedly connected with a driving gear 12.

[0039] In use, when the floating pad 5 moves to the preset position with the oil level, the driving structure is engaged with the driving gear 12 for transmission, thereby driving the screw rod 11 to rotate, the screw rod 11 drives the fixed seat 10 to translate along the axial direction of the screw rod 11, the fixed seat 10 synchronously drives the swing seat 8 and the cleaning plate 6 to move through the hinge shaft 9, and the cleaning plate 6 is scraped on the bottom of the oil sludge, avoiding the pollution of the residual oil sludge to the subsequent new oil, and reducing the risk of equipment operation failure.

[0040] When the cleaning plate 6 translates to the limit position at the end of the oil tank 1, the top rod 43 is pressed against the inner wall of the oil tank 1, thereby driving the swing seat 8 to overturn, and the cleaning plate 6 is overturned. At this time, the waste oil in the oil tank 1 is still in a continuous discharge state, at this time, the subsequent discharged waste oil and the impurities entrained flow through the cleaning plate 6, avoiding the cleaning plate 6 from blocking the oil discharge channel, ensuring the smooth discharge of the waste oil, and shortening the oil discharge time; at the same time, the impurities are prevented from accumulating on the back of the cleaning plate 6, the cleaning effect is improved, and the risk of insulation decline, short circuit and other faults caused by the residual impurities of the equipment is reduced.

[0041] It should be noted that the hinge mode of the swing seat 8 and the fixed seat 10 ensures that the cleaning plate 6 is maximally swung to the vertical state, avoiding the reverse swing of the cleaning plate 6 affecting the subsequent cleaning effect.

[0042] In order to facilitate the driving of the scraping plate assembly, as shown in Figure 4 、 Figure 6 、 Figure 7As shown, the application further comprises that the driving structure comprises a gear shifting gear 13 in meshing transmission with the driving gear 12, the gear shifting gear 13 is coaxially connected with a transmission shaft 14, one end of the transmission shaft 14 is fixedly connected with a transmission gear 15, the other end of the transmission shaft 14 is rotatably connected with the inner wall of the oil tank 1, the lower surface of the mounting frame 4 is fixedly connected with a vertically arranged rack 16, and the rack 16 is in meshing transmission with the transmission gear 15 after moving downward.

[0043] In use, after the oil discharging structure is opened, the oil level gradually decreases, the mounting frame 4 moves downward synchronously with the floating pad 5, and the rack 16 is vertically moved downward, when the rack 16 moves downward to the meshing position with the transmission gear 15, the rack 16 is in meshing transmission with the transmission gear 15, the transmission gear 15 drives the gear shifting gear 13 to rotate synchronously through the transmission shaft 14, the gear shifting gear 13 is in meshing transmission with the driving gear 12, and then the power is transmitted to the screw rod 11, the scraper assembly is started to drive the oil sludge scraping operation; the rack 16 is automatically triggered to mesh with the oil level, without the need for additional power driving, realizing linkage automation of the cleaning process and the oil discharging process, greatly simplifying the operation process and reducing the labor intervention cost.

[0044] As shown in the examples Figure 4 、 Figure 6 、 Figure 8 As shown, the application further comprises that the cleaning plate 6 is internally provided with a sealed cavity 17, one side of the cleaning plate 6 close to the oil discharging structure is provided with a first slot 18 in communication with the sealed cavity 17, the upper surface of the cleaning plate 6 is provided with a second slot 19 in communication with the sealed cavity 17, the first slot 18 is sealingly and slidably connected with an adjusting plate 20, the second slot 19 is sealingly and slidably connected with a baffle 21, and the two groups of swing seats 8 are provided with a sliding groove 22 on the side close to each other, and the sliding groove 22 corresponds to the two ends of the second slot 19.

[0045] In use, when a proper amount of transformer oil is injected into the oil tank 1, the oil liquid generates uniform pressure on the adjusting plate 20 and the baffle 21, pushes the adjusting plate 20 to sealingly slide along the sealed cavity 17 and retract into the first slot 18, the baffle 21 is synchronously retracted into the second slot 19, the gas in the sealed cavity 17 is compressed at the same time, the adjusting plate 20 and the baffle 21 are prevented from being exposed to interfere with the oil injection, and the oil injection process is ensured to be smooth;

[0046] When the oil discharge structure is opened, the oil level in the oil tank 1 gradually decreases, the extrusion force of the oil liquid on the adjusting plate 20 and the baffle 21 decreases, the compressed gas in the sealing cavity 17 elastically rebounds, pushes the adjusting plate 20 to extend outward from the first slot 18, and at the same time drives the baffle 21 to extend outward from the second slot 19. At this time, the baffle 21 can preliminarily shield one side of the cleaning plate 6; when the driving structure drives the cleaning plate 6 to translate and scrape the oil sludge, as the oil sludge continuously accumulates on the side of the cleaning plate 6 close to the oil discharge structure, the extrusion force of the oil sludge on the adjusting plate 20 gradually increases, thereby driving the adjusting plate 20 to gradually retract into the first slot 18. The adjusting plate 20 extrudes the gas in the sealing cavity 17 to generate a pushing force, which pushes the baffle 21 to extend upward along the second slot 19 and elongate. The upper end of the baffle 21 is clamped into the sliding groove 22 of the swing seat 8. The sliding groove 22 corresponds to the second slot 19 and provides a guide and limit for the baffle 21 to avoid deviation and skewing when the baffle 21 extends and retracts. The elongated baffle 21 can form a longitudinal blocking barrier, effectively preventing the oil sludge from accumulating too high to overcome the cleaning plate 6, ensuring that the oil sludge is always limited on one side of the cleaning plate 6 and is pushed to the oil outlet 35 in a directional manner, improving the thoroughness of oil sludge cleaning, and at the same time, without the need for additional power driving, realizing the self-adaptive linkage of the baffle 21 extension and retraction and the oil sludge amount, and further optimizing the automation degree of maintenance and cleaning.

[0047] In order to facilitate the flushing of the integrated independent module 3, as shown in Figure 4 , Figure 5 illustrated, the present application further comprises a mounting plate 23 fixedly connected to the inner side of the floating pad 5, one side of the mounting plate 23 is fixedly connected with a spray plate 24, and the spray plate 24 is provided with a plurality of groups of nozzles 25 facing the integrated independent module 3, and the spray plate 24 is in communication with the multi-stage liquid supply structure.

[0048] In use, when the transformer waste oil is discharged and the oil level gradually decreases, the floating pad 5 drives the mounting plate 23 and the spray plate 24 to move downward synchronously, and at the same time triggers the multi-stage liquid supply structure to start. The transformer oil stored in the multi-stage liquid supply structure is delivered to the spray plate 24 through the pipeline under the action of the structure driving force, the oil liquid is sprayed directionally through the nozzles 25 to form a flushing flow, which can directly act on the surface of the iron core, winding and tap changer, stripping the attached oil sludge, gum and metal particles, avoiding the problems of insulation performance decline, heat dissipation efficiency reduction and other problems caused by impurity accumulation, reducing the risk of winding short circuit, local overheating and other faults;

[0049] During the downward movement of the spray structure with the floating pad 5, the flushing is realized from the upper part to the lower part of the integrated independent module 3; and the flushing process is carried out synchronously with the oil discharge process, without the need for separately adding a disassembly and cleaning step after oil discharge, greatly shortening the downtime maintenance time and reducing the labor intensity; at the same time, the flushing oil liquid is discharged synchronously with the waste oil, without the need for additional treatment of the flushing waste liquid, further optimizing the environmental friendliness and efficiency of the maintenance process.

[0050] As an example, as shown in Figure 4 、 Figure 5 、 Figure 9 、 Figure 10 The present application also includes that the multi-stage liquid supply structure includes a plurality of groups of vertically arranged fixed cylinders 26, the upper end of the fixed cylinder 26 is fixedly connected with the lower surface of the mounting frame 4, the fixed cylinder 26 is sealingly and slidingly connected with a sliding cylinder 27 inside, the sliding cylinder 27 is sealingly and slidingly connected with an extrusion rod 28 inside, the fixed cylinder 26 and the sliding cylinder 27 are both tapered sliding chambers 29 with a large upper part and a small lower part, the upper part of the extrusion rod 28 and the inner side of the sliding cylinder 27 and the upper part of the sliding cylinder 27 and the inner side of the fixed cylinder 26 are both connected with springs 30, the upper part of the extrusion rod 28 and the upper part of the sliding cylinder 27 are both provided with mounting grooves 31, a plurality of groups of elastically notched rings 32 are arranged in the mounting grooves 31, and the elastically notched rings 32 are in sliding contact with the tapered sliding chambers 29;

[0051] The lower end of the extrusion rod 28 is fixedly connected with the inner wall of the oil tank 1 through a connecting seat 42; the upper end of the fixed cylinder 26 is communicated with a one-way liquid inlet valve 33 and a one-way liquid outlet valve 34, and the one-way liquid outlet valve 34 is communicated with the corresponding spray plate 24 through a pipeline.

[0052] In use, when the transformer oil is injected into the oil tank 1, the oil buoyancy drives the floating pad 5 to move upward synchronously, thereby dragging the fixed cylinder 26 to rise together with the mounting frame 4, the fixed cylinder 26 drives the sliding cylinder 27 to move upward synchronously, and in the process of moving upward of the sliding cylinder 27, the transformer oil in the oil tank 1 is sucked into the inside of the sliding cylinder 27 through the one-way liquid inlet valve 33, and the preliminary oil storage is completed, the elastically notched rings 32 on the upper part of the extrusion rod 28 are in close contact with the tapered sliding chambers 29 to form reliable sealing, the staggered design of the elastically notched rings 32 improves the sealing performance, avoids oil leakage during suction, and ensures the oil storage efficiency;

[0053] When the sliding cylinder 27 moves upward to the limiting position of the extrusion rod 28 and cannot continue to rise, the floating pad 5 still drives the fixed cylinder 26 to continue to move upward, further sucking the transformer oil into the fixed cylinder 26 through the one-way liquid inlet valve 33, and completing the secondary oil storage; the oil storage process is completely driven by the oil buoyancy, without the need for additional power devices, realizing the automatic cooperation of the oil storage operation and the oil injection process;

[0054] When the oil discharge structure is opened and the oil level in the oil tank 1 decreases, the floating pad 5 moves downward synchronously with the oil level, driving the mounting frame 4 and the fixed cylinder 26 to move downward, at this time, the spring 30 between the sliding cylinder 27 and the extrusion rod 28 is first elastically reset, so that the transformer oil in the conical sliding chamber 29 of the sliding cylinder 27 is pressed and then delivered to the spray plate 24 through the one-way liquid outlet valve 34, at this time, the oil discharge pressure gradually increases from the minimum state, and the early spray amount is avoided to be too large, since the iron core, the winding upper insulation layer of the integrated independent module 3 and the distributed tap switch and other precision electrical components are relatively weak, damage to the iron core, the winding and other precision components of the integrated independent module 3 caused by high pressure impact can be avoided, and the safety of equipment operation is ensured.

[0055] With the continuous downward movement of the floating pad 5, the downward pressure of the mounting frame 4 on the fixed cylinder 26 gradually increases, driving the fixed cylinder 26 to further move downward, at this time, the spring 30 between the sliding cylinder 27 and the fixed cylinder 26 is elastically reset, forming extrusion on the conical sliding chamber 29 in the fixed cylinder 26, the transformer oil stored in the conical sliding chamber 29 in the fixed cylinder 26 is continuously discharged through the one-way liquid outlet valve 34, since the volume of the conical chamber in the fixed cylinder 26 is larger, the oil discharge pressure is further gradually increased, and the spray amount is continuously increased, so that the stubborn oil sludge, gum and metal particles attached to the surface of the integrated independent module 3 can be strongly washed, especially for the case that the oil sludge attached to the surface of the integrated independent module 3 gradually thickens from top to bottom, ensuring complete cleaning, realizing the spray mode of gradually changing flow from small to large, and the accurate matching of spray pressure and flow can be completed without manual intervention.

[0056] It should be pointed out that the mounting groove 31 is connected with a limiting block corresponding to the gap position of the elastic gap ring 32, and the limiting block can prevent the elastic gap ring 32 from rotating.

[0057] In order to improve the oil discharge efficiency, as shown in Figure 4 、 Figure 7 The oil discharge structure includes a plurality of oil outlets 35 opened in the bottom of the oil tank 1, the oil outlets 35 are fixedly connected with oil outlet pipes 36, and the lower ends of the plurality of oil outlet pipes 36 are commonly connected with an oil discharge pipe 37.

[0058] In use, when the transformer needs to replace the waste oil, after the control valve of the oil discharge pipe 37 is opened, the waste oil in the oil tank 1 and the oil sludge scraped off by the scraper assembly can quickly flow into the corresponding oil outlet pipe 36 through the plurality of oil outlets 35, the design of the plurality of oil outlets 35 can effectively avoid the oil discharge blockage caused by the blockage of a single oil outlet 35, and at the same time, the flow path of the waste oil and the oil sludge is shortened, and the oil discharge efficiency is significantly improved.

[0059] The waste oil is discharged from the oil discharge pipe 37 after being converged through the oil discharge pipes 36, so that the waste oil and the oil sludge are collected, which is convenient for subsequent recycling and reuse; meanwhile, according to actual operation and maintenance requirements, one end of the oil discharge pipe 37 can be connected to a filtering and purifying device to filter and purify the waste oil; the transformer oil that meets the standard after purification can be injected into the oil tank 1 again, and an appropriate amount of new transformer oil can be supplemented as needed, so that the oil is recycled and used, and the operation and maintenance cost is reduced.

[0060] In order to facilitate scraping and cleaning the inner wall of the oil tank 1, as shown in Figure 4 , Figure 5 illustrated, the present application further comprises that the installation frame 4 is provided with a scraping plate 39 on the side close to the inner wall of the oil tank 1.

[0061] In use, when the oil is discharged, the installation frame 4 moves downward with the floating pad 5, the scraping plate 39 slides downward in close contact with the inner wall of the oil tank 1, and the oil sludge, gum and other stubborn impurities deposited on the inner wall are scraped and cleaned, so that the impurities are effectively prevented from being deposited on the inner wall of the oil tank 1 for a long time to form scale, and the heat dissipation efficiency of the oil tank 1 is affected, and the risk of pollution of new oil caused by falling of impurities is reduced.

[0062] As shown in Figure 2 , Figure 3 illustrated, the present application further comprises that the lower surface of the cover plate 2 is fixedly connected with a detection probe 40 for detecting the oil level and the oil temperature in the oil tank 1; and the upper surface of the cover plate 2 is provided with a detection interface 41 electrically connected with the detection probe 40 and used for connecting an external detection device.

[0063] In use, when the transformer oil is injected into the oil tank 1, the detection probe 40 on the lower surface of the cover plate 2 can detect the oil level in real time, and the detection data is transmitted to the external detection device through the detection interface 41, so that the worker can master the oil injection progress without opening the cover, and the oil injection is prevented from being excessive to cause waste or insufficient to affect the normal operation of the equipment, and the accuracy and convenience of the oil injection operation are improved.

[0064] During normal operation of the transformer, the detection probe 40 continuously monitors the oil temperature and the oil level in the oil tank 1, and the real-time data is synchronously transmitted to the external device through the detection interface 41, so that the worker can remotely and in real time master the oil state, and when the oil temperature abnormally rises or the oil level abnormally drops, the fault can be found and checked in time, and the serious faults such as short circuit of winding and local overheating caused by deterioration of oil performance are avoided.

[0065] In use, qualified transformer oil is injected into the oil tank 1, and when the amount of oil injection is gradually increased, the floating pad 5 is synchronously moved upward by the buoyancy, driving the installation frame 4 to move horizontally upward; the multi-stage liquid supply structure is triggered to act synchronously, the fixed cylinder 26 rises with the installation frame 4, first pulls the sliding cylinder 27 to move upward and absorbs transformer oil through the one-way liquid inlet valve 33 to complete the initial oil storage, after the sliding cylinder 27 reaches the limit, the fixed cylinder 26 continues to rise, further absorbs transformer oil to complete the secondary oil storage; during the oil injection process, the detection probe rod 40 on the lower surface of the cover plate 2 detects the oil level in real time, and the data is transmitted to the external device through the detection interface 41, and the worker judges the oil injection progress according to the data until the oil level reaches the preset standard, and the oil injection is stopped;

[0066] After the transformer is put into operation, the detection probe rod 40 continuously monitors the oil temperature and oil level in the oil tank 1, and the real-time data is synchronously transmitted to the external device through the detection interface 41, so that the worker remotely masters the oil state and timely investigates the fault hidden danger such as abnormal rise of oil temperature or abnormal drop of oil level;

[0067] When the transformer oil needs to be replaced, the control valve of the oil discharge pipe 37 is opened, the waste oil in the oil tank 1 is collected into the oil discharge pipe 36 through a plurality of oil outlets 35, and then is uniformly discharged through the oil discharge pipe 37; if recycling is needed, the oil discharge pipe 37 can be connected to a filtering and purifying device to purify the waste oil;

[0068] During the waste oil discharge process, the oil level gradually decreases, the floating pad 5 is synchronously moved downward, driving the installation frame 4 and the fixed cylinder 26 to move downward; first, the spring 30 between the sliding cylinder 27 and the extrusion rod 28 is elastically reset, the transformer oil in the sliding cylinder 27 is pressed and then is transported to the spray plate 24 through the one-way liquid outlet valve 34, is directionally sprayed to the surface of the integrated independent module 3 through the nozzle 25, and low-pressure small-flow flushing is realized; with the continuous downward movement of the floating pad 5, the downward pressure of the installation frame 4 on the fixed cylinder 26 increases, the spring 30 between the sliding cylinder 27 and the fixed cylinder 26 is reset, the oil in the fixed cylinder 26 is pressed and discharged, the spray pressure and flow gradually increase, and high-pressure large-flow flushing is realized; at the same time, the floating pad 5 drives the installation plate 23 and the spray plate 24 to move downward, and the integrated independent module 3 is completely flushed from the upper part to the lower part;

[0069] When the floating pad 5 moves downward to the preset position, the rack 16 on the lower surface of the installation frame 4 is engaged with the transmission gear 15 to drive the driving gear 12 and the screw rod 11 to rotate through the transmission shaft 14 and the variable speed gear 13; the screw rod 11 drives the fixed seat 10 to translate, drives the swing seat 8 and the cleaning plate 6 to translate along the bottom of the oil tank 1 through the hinged shaft 9, and scrapes the deposited sludge; during the translation process, the sludge accumulation increases to drive the adjusting plate 20 to retract, the gas in the sealed cavity 17 is pressed to drive the baffle 21 to extend and be clamped into the sliding groove 22, a longitudinal barrier is formed to prevent the sludge from overflowing; at the same time, the installation frame 4 drives the scraping plate 39 to move downward and adhere to the inner wall of the oil tank 1, and the adhering impurities on the inner wall are cleaned;

[0070] When the cleaning plate 6 is translated to the end limit position of the oil tank 1, the top rod 43 extrudes the inner wall of the oil tank 1, drives the swing seat 8 to overturn, and the cleaning plate 6 is prevented from shielding the oil discharge channel after overturning, so that the waste oil and the oil sludge after scraping are smoothly discharged through the oil outlet 35 until the waste oil and the oil sludge are completely discharged;

[0071] If the core, winding, tap switch and other components need to be repaired or replaced, the cover plate 2 is lifted by lifting equipment, and the integrated independent module 3 is moved out synchronously with the cover plate 2; after the repair or replacement is completed, the integrated independent module 3 is put back into the oil tank 1, the cover plate 2 is closed, the oil injection preparation process is repeated, and the equipment operation is restored.

[0072] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application. These changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An oil-immersed transformer easy to maintain, characterized in that, The utility model provides an oil tank (1), the upper surface of the oil tank (1) is equipped with the cover plate (2), the lower surface of cover plate (2) is connected with integrated independent module (3), integrated independent module (3) integrates iron core, winding and tap switch, the bottom of oil tank (1) is equipped with scraper assembly, the inside of oil tank (1) is equipped with the installation frame (4) of horizontal arrangement, the upper surface of installation frame (4) is equipped with the floating pad (5), the inside of floating pad (5) is equipped with the spray structure for washing integrated independent module (3), the lower part of installation frame (4) is equipped with the drive structure for driving scraper assembly moves, installation frame (4) and the bottom of oil tank (1) are connected with multistage liquid supply structure that communicates with spray structure, the bottom of oil tank (1) is equipped with oil discharge structure, The scraper assembly includes a cleaning plate (6) vertically disposed on the inside bottom of the oil tank (1), the lower part of the side of the cleaning plate (6) away from the oil discharge structure is provided with a rounded corner (7), and the upper part of both ends of the cleaning plate (6) is connected with a swing seat (8). The inside of the cleaning plate (6) is provided with a sealed cavity (17), the side of the cleaning plate (6) close to the oil discharge structure is provided with a first slot (18) in communication with the sealed cavity (17), the upper surface of the cleaning plate (6) is provided with a second slot (19) in communication with the sealed cavity (17), the first slot (18) is sealingly and slidably connected with an adjusting plate (20), the second slot (19) is sealingly and slidably connected with a baffle (21), and the side of both groups of swing seats (8) close to each other is provided with a sliding groove (22) corresponding to both ends of the second slot (19).

2. An oil immersed transformer easy to maintain according to claim 1, characterized in that, The top of the swing seat (8) is connected with a top rod (43), the side of both groups of swing seats (8) close to each other is hingedly connected with a fixed seat (10) through a hinge shaft (9), the fixed seat (10) is provided with a threaded hole, the threaded hole is threadedly connected with a screw rod (11), both ends of the screw rod (11) are rotatably connected with the inner wall of the oil tank (1), and the outer end of one end of the screw rod (11) is fixedly connected with a drive gear (12).

3. An oil immersed transformer easy to maintain according to claim 2, characterized in that, The drive structure includes a variable speed gear (13) in meshing transmission with the drive gear (12), the variable speed gear (13) is coaxially connected with a transmission shaft (14), one end of the transmission shaft (14) is fixedly connected with a transmission gear (15), the other end of the transmission shaft (14) is rotatably connected with the inner wall of the oil tank (1), the lower surface of the installation frame (4) is fixedly connected with a vertically arranged rack (16), and the rack (16) is in meshing transmission with the transmission gear (15) after moving downward.

4. An oil immersed transformer easy to maintain according to claim 3, characterized in that, The spray structure includes a mounting plate (23) fixedly connected to the inside of the floating pad (5), the mounting plate (23) is fixedly connected with a spray plate (24) on one side, the spray plate (24) is provided with a plurality of groups of nozzles (25) facing the integrated independent module (3), and the spray plate (24) is in communication with the multistage liquid supply structure.

5. An oil immersed transformer easy to maintain according to claim 4, characterized in that, The multi-stage liquid supply structure comprises a plurality of groups of vertically arranged fixed cylinders (26), the upper end of the fixed cylinder (26) is fixedly connected with the lower surface of the mounting frame (4), the fixed cylinder (26) is sealingly and slidably connected with a sliding cylinder (27) in the inside, the sliding cylinder (27) is sealingly and slidably connected with an extrusion rod (28) in the inside, the fixed cylinder (26) and the sliding cylinder (27) are both conical sliding chambers (29) with a large size at the top and a small size at the bottom, the upper part of the extrusion rod (28) and the inner side of the sliding cylinder (27) and the upper part of the sliding cylinder (27) and the inner side of the fixed cylinder (26) are both connected with springs (30), the upper part of the extrusion rod (28) and the outer side of the upper part of the sliding cylinder (27) are both provided with mounting grooves (31), a plurality of groups of elastic notch rings (32) are mounted in the mounting grooves (31) in a staggered manner, and the elastic notch ring (32) and the conical sliding chamber (29) are in sliding contact; The lower end of the extrusion rod (28) is fixedly connected with the inner wall of the oil tank (1) through a connecting seat (42); the upper end of the fixed cylinder (26) is communicated with a one-way liquid inlet valve (33) and a one-way liquid outlet valve (34), and the one-way liquid outlet valve (34) is communicated with the corresponding spray plate (24) through a pipeline.

6. An oil immersed transformer easy to maintain according to claim 5, characterized in that, The oil discharging structure comprises a plurality of groups of oil outlets (35) formed in the bottom of the oil tank (1), the oil outlet (35) is fixedly connected with an oil outlet pipe (36), and the lower ends of a plurality of groups of the oil outlet pipes (36) are commonly communicated with an oil discharging pipe (37); the lower surface of the oil tank (1) is fixedly connected with a support truss (38) for supporting the oil tank (1).

7. An oil immersed transformer easy to maintain according to claim 6, characterized in that, The side of the mounting frame (4) close to the inner wall of the oil tank (1) is provided with a dirt scraping plate (39).

8. An oil immersed transformer easy to maintain according to claim 7, characterized in that, The lower surface of the cover plate (2) is fixedly connected with a detection probe rod (40) for detecting the oil level and the oil temperature in the oil tank (1); the upper surface of the cover plate (2) is provided with a detection interface (41) electrically connected with the detection probe rod (40) and used for externally connecting a detection device. The lower surface of the cover plate (2) is fixedly connected with a detection probe rod (40) for detecting the oil level and the oil temperature in the oil tank (1); the upper surface of the cover plate (2) is provided with a detection interface (41) electrically connected with the detection probe rod (40) and used for externally connecting a detection device.

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