A transformer with a quick oil discharge structure

Abstract

This invention relates to the field of transformer technology and discloses a transformer with a rapid oil drainage structure, including a transformer body. An oil tank groove is formed on the inner wall of the transformer body. A support frame is fixedly mounted at the bottom of the transformer body, and an auxiliary frame is fixedly mounted at the bottom of the support frame. A motor is fixedly mounted on the inner wall of the auxiliary frame, and a transmission rod is fixedly sleeved on the output shaft of the motor. An oil inlet plate is fixedly mounted on the top of the transmission rod, and the bottom of the oil inlet plate is rotatably connected to the bottom of the inner wall of the oil tank groove. A guide groove is formed on the inner wall of the oil inlet plate. By employing a three-layer oil drainage pipeline consisting of an upper pressure-sensing electric valve, a middle electromagnetic ball valve with a throttle valve, and a lower rotating oil inlet plate and a one-way gear pump, synchronous oil flow can be achieved in emergency scenarios, improving the oil drainage efficiency compared to traditional structures. The lower rotating oil inlet plate, combined with a silicone scraper, can scrape away deposited impurities at the bottom of the oil tank, and the negative pressure suction of the one-way gear pump reduces the residual oil rate.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to a transformer with a rapid oil drainage structure. Background Technology

[0002] Oil-immersed transformers are transformer equipment that uses transformer oil as the main insulating and cooling medium. They utilize the dielectric properties and thermal conductivity of oil to achieve safe and reliable insulation and heat dissipation while efficiently transmitting electrical energy.

[0003] As a core piece of equipment in the power system, the efficiency of oil drainage and bottom cleaning of oil-immersed transformers directly affects the operational safety and ease of maintenance. Currently, existing technologies suffer from the following key challenges:

[0004] Traditional transformers rely on a single gravity-driven oil drain line, which can only drain the upper and middle layers of oil. Due to the presence of dead zones such as supports and corners at the bottom of the tank, sludge and impurities are prone to accumulate, resulting in a high residual oil rate. Especially during emergency oil draining, gravity-driven operation alone cannot achieve rapid oil flow, delaying fire control or fault handling.

[0005] During the oil draining process, metal shavings, sludge and other impurities deposited at the bottom of the oil tank can easily enter the drain pipe with the oil, causing the pipe to become blocked. Traditional structures require the bottom cover of the oil tank to be removed for cleaning, which is cumbersome, takes a long time to maintain, and is also easy to contaminate the insulating oil.

[0006] Traditional oil drainage systems lack integrated control, requiring manual switching of valves and equipment for different scenarios such as emergency, daily, and transportation, resulting in slow response. Furthermore, they lack multi-signal linkage protection for pressure, oil level, and fire, making them prone to safety risks due to misoperation or signal lag.

[0007] Oil drain lines often use a combination of a separate oil pump and a check valve, with many interfaces, making them prone to oil leakage due to vibration or aging of seals; in some scenarios, oil backflow can cause pressure fluctuations in the oil tank, affecting the stability of equipment operation. Summary of the Invention

[0008] This invention provides a transformer with a rapid oil drainage structure to solve the problems mentioned in the background art.

[0009] This invention provides the following technical solution: a transformer with a rapid oil drainage structure, comprising a transformer body, an oil tank groove formed on the inner wall of the transformer body, a support frame fixedly mounted at the bottom of the transformer body, an auxiliary frame fixedly mounted at the bottom of the support frame, a motor fixedly mounted on the inner wall of the auxiliary frame, a transmission rod fixedly sleeved on the output shaft of the motor, an oil inlet plate fixedly mounted on the top of the transmission rod, and the bottom of the oil inlet plate rotatably connected to the bottom of the inner wall of the oil tank groove, a guide groove formed on the inner wall of the oil inlet plate, a silicone scraper fixedly mounted on the side of the oil inlet plate, a circular groove formed on the side of the guide groove away from the silicone scraper, a filter plate slidably sleeved on the inner wall of the circular groove, a spiral guide rib fixedly mounted on the top of the filter plate, a cylinder fixedly mounted on the bottom of the filter plate, a roller movably sleeved on the inner wall of the bottom of the cylinder, a connecting pipe fixedly sleeved on the inner wall of the cylinder, and the connecting pipe slidably sleeved on the transmission rod, a telescopic hose installed at the bottom of the connecting pipe, and a base frame fixedly mounted on the bottom of the transformer body.

[0010] As a preferred embodiment of the present invention, a through groove is provided in the middle section between the center and the outer edge of the filter plate. The top of the filter plate is connected to the inner wall of the cylinder through the inner wall of the through groove, and the top of the filter plate is connected to the inner wall of the cylinder through the inner wall of the spiral guide rib. A sealing gasket one is fitted on the cylinder, and a sealing gasket two is fitted on the inner wall of the transformer body. The inner wall of the sealing gasket two is in close contact with the outer edge of the sealing gasket one.

[0011] As a preferred embodiment of the present invention, an auxiliary cylinder is fixedly sleeved on the inner wall of the support frame. The inner wall of the auxiliary cylinder near the top is rotatably sleeved with the bottom of the telescopic hose. A lower oil drain pipe is fixedly sleeved on the inner wall of the auxiliary cylinder. A one-way gear pump is connected to the end of the lower oil drain pipe away from the auxiliary cylinder. The end of the one-way gear pump away from the lower oil drain pipe is connected to a main oil drain pipe through a connecting pipe. A switching valve is fixedly sleeved on the main oil drain pipe.

[0012] As a preferred embodiment of the present invention, the inner wall of the oil tank near the upper layer is connected to a pressure-sensing electric valve via a connecting pipe, and the end of the pressure-sensing electric valve away from the oil tank is connected to the inner wall of the main drain pipe via a connecting pipe.

[0013] As a preferred embodiment of the present invention, the inner wall of the oil tank near the middle layer is connected to an electromagnetic ball valve via a connecting pipe, and the end of the electromagnetic ball valve away from the oil tank is connected to a throttle valve via a connecting pipe. The end of the throttle valve away from the electromagnetic ball valve is connected to the inner wall of the main drain pipe via a connecting pipe.

[0014] As a preferred embodiment of the present invention, an electromagnetic gate valve is fixedly mounted on the side of the oil inlet plate, and the inner wall of the oil tank near the bottom is connected to the inner wall of the guide groove through the inner wall of the electromagnetic gate valve. There are two electromagnetic gate valves, and the two electromagnetic gate valves are diagonally distributed on both sides of the oil inlet plate. The connection structure of the two electromagnetic gate valves is completely consistent.

[0015] As a preferred embodiment of the present invention, a nitrogen storage tank is fixedly mounted on the top of the transformer body. The outlet of the nitrogen storage tank is connected to a pressure reducing valve through a connecting pipe, and the pressure reducing valve is connected to an electrically controlled one-way valve through a connecting pipe. The electrically controlled one-way valve is connected to the inner wall of the oil tank through a connecting pipe.

[0016] As a preferred embodiment of the present invention, an oil conservator is fixedly installed at the top of the transformer body away from the nitrogen storage tank, and a float-type oil level sensor is fixedly installed on the inner wall of the oil conservator. The oil outlet of the oil conservator is connected to a heavy gas relay through a connecting pipe, and the heavy gas relay is connected to the inner wall of the oil tank through a connecting pipe.

[0017] As a preferred embodiment of the present invention, a sliding groove is provided at the bottom of the transformer body, a baffle plate 1 is slidably connected to the inner wall of the sliding groove, and a baffle plate 2 is slidably connected to the side of the sliding groove away from the baffle plate 1. The baffle plate 1 and the baffle plate 2 are connected by screws, the top of the baffle plate 1 and the baffle plate 2 are at the same horizontal plane, and the top of the baffle plate 1 and the top of the baffle plate 2 overlap with the outer edge of the roller.

[0018] As a preferred embodiment of the present invention, a fire detector is installed on the top of the transformer body, a light shield is welded to the top of the transformer body, a pressure sensor is fixedly mounted on the top of the transformer body, and the probe of the pressure sensor passes through the inner wall of the transformer body and is connected to the inner wall of the oil tank. A control cabinet is fixedly mounted on the side of the transformer body, and a PLC controller is installed on the inner wall of the control cabinet. The PLC controller is electrically connected to a one-way gear pump, a switching valve, a pressure-sensing electric valve, a solenoid ball valve, a throttle valve, a solenoid gate valve, a pressure reducing valve, an electrically controlled one-way valve, a float-type oil level sensor, a heavy gas relay, as well as the fire detector and the pressure sensor.

[0019] The present invention has the following beneficial effects:

[0020] 1. This transformer with a rapid oil drainage structure employs a three-layer oil drainage pipeline consisting of an upper pressure-sensing electric valve, a middle electromagnetic ball valve with a throttle valve, and a lower rotating oil inlet plate and a one-way gear pump. In emergency scenarios, it can achieve synchronous oil flow and improve oil drainage efficiency compared to traditional structures. The lower rotating oil inlet plate, combined with a silicone scraper, can remove deposited impurities from the bottom of the oil tank, and the negative pressure suction of the one-way gear pump reduces the residual oil rate.

[0021] 2. This transformer with a rapid oil drainage structure integrates a spiral guide rib filter plate inside the oil inlet plate. Through vortex centrifugal force, impurities are intercepted in layers. Large particles of impurities are deposited at the edge of the filter plate, while small impurities are trapped by the filter screen. The filter plate adopts a sliding sleeve structure. With the detachable design of bottom baffle one and baffle two, there is no need to disassemble the oil tank when cleaning slag. It can be completed by a single person, thereby improving maintenance efficiency.

[0022] 3. This transformer with a rapid oil drainage structure uses a PLC controller to link multiple signals such as fire detectors, pressure sensors, float-type oil level sensors, and heavy gas relays. It has three preset oil drainage modes: emergency, daily, and transportation. The emergency response time is short. The nitrogen storage tank and the electrically controlled check valve work together to quickly establish a slight positive pressure in the oil tank during emergencies, further accelerating the oil drainage.

[0023] 4. This transformer with a rapid oil drainage structure uses a one-way gear pump for lower-level oil drainage, integrating the functions of an oil pump and a one-way valve, reducing pipeline interfaces and lowering the leakage rate. A double seal is installed between the cylinder and the transformer body using sealing gasket one and sealing gasket two. The telescopic hose is adapted to the rotation of the transmission rod to prevent oil leakage. The electrically controlled one-way valve is linked with the pressure sensor to prevent overpressure in the oil tank or oil backflow, ensuring the safe operation of the equipment. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the front section structure of the present invention;

[0026] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0027] Figure 4 This is a schematic cross-sectional view of the flow guide channel of the present invention;

[0028] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B;

[0029] Figure 6 This is a schematic cross-sectional view of the oil tank groove of the present invention;

[0030] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point C;

[0031] Figure 8 This is a schematic diagram of the chute structure of the present invention;

[0032] Figure 9 This is a schematic diagram of the spiral guide rib structure of the present invention;

[0033] Figure 10 This is a schematic diagram of the second baffle structure of the present invention;

[0034] Figure 11 This is a flowchart illustrating the overall process of this invention.

[0035] Figure 12 This is a flowchart of the fire emergency oil drainage process of the present invention;

[0036] Figure 13 This is a flowchart of the routine oil change process of this invention;

[0037] Figure 14 This is a flowchart of the oil transportation and discharge process of the present invention.

[0038] In the diagram: 1. Transformer body; 2. Oil tank; 3. Support frame; 4. Auxiliary frame; 5. Motor; 6. Transmission rod; 7. Oil inlet plate; 8. Silicone scraper; 9. Guide channel; 10. Solenoid gate valve; 11. Circular groove; 12. Filter plate; 13. Spiral guide rib; 14. Through groove; 15. Cylinder; 16. Sealing gasket one; 17. Sealing gasket two; 18. Roller; 19. Connecting pipe; 20. Telescopic hose; 21. Auxiliary cylinder; 22. Lower oil drain pipe; 23. One-way gear pump 24. Base frame; 25. Main drain pipe; 26. Baffle 1; 27. Baffle 2; 28. Slide groove; 29. ​​Nitrogen storage tank; 30. Pressure reducing valve; 31. Electrically controlled check valve; 32. Pressure sensor; 33. Oil tank; 34. Float-type oil level sensor; 35. Heavy gas relay; 36. Fire detector; 37. Sunshade; 38. Pressure-sensing electric valve; 39. Solenoid ball valve; 40. Throttle valve; 41. Switching valve; 42. Control cabinet; 43. PLC controller. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1-14A transformer with a rapid oil drainage structure includes a transformer body 1, an oil tank groove 2 formed on the inner wall of the transformer body 1, a support frame 3 fixedly mounted at the bottom of the transformer body 1, an auxiliary frame 4 fixedly mounted at the bottom of the support frame 3, a motor 5 fixedly mounted on the inner wall of the auxiliary frame 4, a transmission rod 6 fixedly sleeved on the output shaft of the motor 5, an oil inlet plate 7 fixedly mounted on the top of the transmission rod 6, and the bottom of the oil inlet plate 7 rotatably connected to the bottom of the inner wall of the oil tank groove 2. A guide groove 9 is formed on the inner wall of the oil inlet plate 7, a silicone scraper 8 is fixedly mounted on the side of the oil inlet plate 7, a circular groove 11 is formed on the side of the guide groove 9 away from the silicone scraper 8, a filter plate 12 is slidably sleeved on the inner wall of the circular groove 11, a spiral guide rib 13 is fixedly mounted on the top of the filter plate 12, a cylinder 15 is fixedly mounted on the bottom of the filter plate 12, and a roller is movably sleeved on the inner wall of the bottom of the cylinder 15. A connecting pipe 19 is fixedly sleeved on the inner wall of the shaft 18 and the cylinder 15, and the connecting pipe 19 is slidably sleeved with the transmission rod 6. A telescopic hose 20 is installed at the bottom of the connecting pipe 19. A base frame 24 is fixedly mounted on the bottom of the transformer body 1. The top of the filter plate 12 is concave and the bottom is convex at the center, and the top and bottom of the filter plate 12 are not connected. The spiral guide rib 13 works with the filter plate 12 to rotate with the oil inlet plate 7, which drives the oil to form a spiral flow field, concentrates impurities and leaves them at the concave center of the filter plate 12, thereby avoiding impurities from clogging the through groove 14. The opening of the guide groove 9 reduces the oil flow resistance and helps impurities to quickly gather to the top of the filter plate 12. The telescopic hose 20 is a metal corrugated pipe with an outer layer wrapped with stainless steel braided mesh. It has high pressure resistance and can withstand axial displacement and angular deviation, and is suitable for the vibration during transformer operation.

[0041] In a preferred embodiment, a through groove 14 is provided in the middle section between the center and the outer edge of the filter plate 12. The top of the filter plate 12 is connected to the inner wall of the cylinder 15 through the inner wall of the through groove 14, and the top of the filter plate 12 is connected to the inner wall of the cylinder 15 through the inner wall of the spiral guide rib 13. A sealing gasket 16 is fitted onto the cylinder 15, and a sealing gasket 17 is fitted onto the inner wall of the transformer body 1. The inner wall of the sealing gasket 17 is in close contact with the outer edge of the sealing gasket 16. The filter plate 12 is made of 316L stainless steel, and the spiral guide rib 13 is integrally welded to the filter plate 12. Through the cooperation of the sealing gasket 16 and the sealing gasket 17, the sealing gasket 16 and the sealing gasket 17 are tightly fitted, which can effectively resist the vibration and oil temperature changes during transformer operation and reduce the leakage rate.

[0042] In a preferred embodiment, an auxiliary cylinder 21 is fixedly sleeved on the inner wall of the support frame 3. The inner wall of the auxiliary cylinder 21 near the top is rotatably sleeved with the bottom of the telescopic hose 20. A lower oil drain pipe 22 is fixedly sleeved on the inner wall of the auxiliary cylinder 21. A one-way gear pump 23 is connected to the end of the lower oil drain pipe 22 away from the auxiliary cylinder 21. The end of the one-way gear pump 23 away from the lower oil drain pipe 22 is connected to a main oil drain pipe 25 through a connecting pipe. A switching valve 4 is fixedly sleeved on the main oil drain pipe 25. 1. The one-way gear pump 23 is model RCB-80. The lower oil drain pipe 22 is made of stainless steel. The one-way gear pump 23 and the lower oil drain pipe 22 are connected by flanges. A metal spiral wound gasket (with an inner fluororubber layer) is installed between the flanges to ensure reliable high-pressure sealing. The one-way gear pump 23 integrates the functions of an oil pump and a one-way valve. The pump body has a hollow jacket insulation structure, which can be heated by circulating heat transfer oil to prevent the insulating oil from solidifying and blocking the pipeline in low-temperature environments. It is suitable for wide temperature conditions from -30℃ to 100℃.

[0043] In a preferred embodiment, a pressure-sensing electric valve 38 is connected to the inner wall of the oil tank 2 near the upper layer via a connecting pipe. The end of the pressure-sensing electric valve 38 away from the oil tank 2 is connected to the inner wall of the main drain pipe 25 via a connecting pipe. The pressure-sensing electric valve 38 is a DN200 explosion-proof valve that can automatically open when the pressure in the oil tank is ≥0.4MPa, with an emergency response time ≤0.5s. When the valve is closed, the sealing surface uses a hard alloy sealing surface + fluororubber sealing ring, and the leakage is ≤0.01ml / min.

[0044] In a preferred embodiment, an electromagnetic ball valve 39 is connected to the inner wall of the oil tank 2 near the middle layer via a connecting pipe, and a throttle valve 40 is connected to the end of the electromagnetic ball valve 39 away from the oil tank 2 via a connecting pipe. The end of the throttle valve 40 away from the electromagnetic ball valve 39 is connected to the inner wall of the main drain pipe 25 via a connecting pipe. The electromagnetic ball valve 39 is a DN200 direct-acting valve, model M-3SEW6U3X, and the matching throttle valve 40 is an adjustable throttle valve, which facilitates flow adjustment according to the suitable environment.

[0045] In a preferred embodiment, an electromagnetic gate valve 10 is fixedly mounted on the side of the oil inlet plate 7. The inner wall of the oil tank 2 near the bottom is connected to the inner wall of the guide groove 9 through the inner wall of the electromagnetic gate valve 10. There are two electromagnetic gate valves 10, which are diagonally distributed on both sides of the oil inlet plate 7. The connection structure of the two electromagnetic gate valves 10 is completely consistent. The electromagnetic gate valve 10 is model ZCS-80. It is diagonally distributed on both sides of the oil inlet plate 7. When it rotates synchronously with the oil inlet plate, it can alternately be on the "flow-facing side" to continuously receive the scraped impurities and oil, and avoid flow rate fluctuations caused by unilateral oil inlet.

[0046] In a preferred embodiment, a nitrogen storage tank 29 is fixedly mounted on the top of the transformer body 1. The outlet of the nitrogen storage tank 29 is connected to a pressure reducing valve 30 via a connecting pipe, and the pressure reducing valve 30 is connected to an electrically controlled check valve 31 via a connecting pipe. The electrically controlled check valve 31 is connected to the inner wall of the oil tank 2 via a connecting pipe. The nitrogen storage tank 29 is a 40L high-pressure steel cylinder with a rated pressure of 15MPa. The matching pressure reducing valve 30 is a two-stage pressure reducing valve with an output pressure accuracy of ±0.05MPa. The electrically controlled check valve 31 is a DN50 explosion-proof valve, model WLOH-2A / R, with a valve opening pressure ≤0.1MPa and a reverse sealing pressure ≥2MPa when closed to prevent oil backflow from contaminating the nitrogen source.

[0047] In a preferred embodiment, an oil conservator 33 is fixedly mounted on the top of the transformer body 1, away from the nitrogen storage tank 29. A float-type oil level sensor 34 is fixedly mounted on the inner wall of the oil conservator 33. The oil outlet of the oil conservator 33 is connected to a heavy gas relay 35 through a connecting pipe. The heavy gas relay 35 is connected to the inner wall of the oil tank 2 through a connecting pipe. The float-type oil level sensor 34 is a magnetic float type, model UQK-651, which outputs a 4-20mA current signal to the PLC controller 43 to realize real-time oil level monitoring and remote transmission. The heavy gas relay 35 is a QJ1-80 type, installed between the oil conservator 33 and the oil tank 2. When a short circuit fault occurs in the oil tank, the heavy gas action can be triggered when the oil flow velocity is ≥1m / s. The action signal is transmitted to the PLC controller 43 to trigger the emergency oil drainage program.

[0048] In a preferred embodiment, a groove 28 is provided at the bottom of the transformer body 1. A baffle 26 is slidably connected to the inner wall of the groove 28, and a baffle 27 is slidably connected to the side of the groove 28 away from the baffle 26. The baffle 26 and the baffle 27 are connected by screws. The top of the baffle 26 and the baffle 27 are at the same level, and the tops of both the baffle 26 and the baffle 27 overlap with the outer edge of the roller 18. Both the baffle 26 and the baffle 27 are made of Q235 steel plate, and the connecting screws between the baffle 26 and the baffle 27 are M16 stainless steel bolts. The roller 18 is made of nylon and bears the weight of the cylinder 15 and the filter plate 12. The rotational resistance is ≤5N, ensuring that the oil inlet plate 7 rotates smoothly.

[0049] In a preferred embodiment, a fire detector 36 is installed on the top of the transformer body 1, a light shield 37 is welded to the top of the transformer body 1, a pressure sensor 32 is fixedly mounted on the top of the transformer body 1, and the probe of the pressure sensor 32 passes through the inner wall of the transformer body 1 and is connected to the inner wall of the oil tank 2. A control cabinet 42 is fixedly mounted on the side of the transformer body 1, and a PLC controller 43 is installed on the inner wall of the control cabinet 42. The PLC controller 43 is connected to a one-way gear pump 23, a switching valve 41, a pressure-sensing electric valve 38, a solenoid ball valve 39, a throttle valve 40, a solenoid gate valve 10, a pressure reducing valve 30, an electrically controlled one-way valve 31, a float-type oil level sensor 34, and a heavy gas... Relay 35, fire detector 36, and pressure sensor 32 are all electrically connected. Fire detector 36 is an explosion-proof heat and smoke detector, model JTW-ZDM-G3, with a detection range of temperature 50-100℃ and smoke concentration 0.1-2.0dB / m³. The matching light shield 37 is made of stainless steel to prevent direct sunlight from causing false triggering of the detector. Pressure sensor 32 is a diffused silicon pressure sensor, model MPM480, with a range of 0-1MPa and an accuracy of ±0.5%FS. The probe extends into the oil tank 2 to measure pressure. Control cabinet 42 is a stainless steel explosion-proof control cabinet. The internal PLC controller 43 is a Siemens S7-200. The SMART series is equipped with 16 digital input / output modules and 8 analog input modules, enabling linkage control with various sensors, valves, and oil pumps. The control cabinet panel 42 is equipped with a touch screen, which can display the operating status of each component, oil level, pressure and other parameters in real time, and supports manual / automatic mode switching, which is convenient for operation and troubleshooting by maintenance personnel.

[0050] Working principle:

[0051] I. Emergency Oil Drainage in a Fire:

[0052] 1. Nitrogen pressurization start: Control the opening of pressure reducing valve 30 to reduce the pressure of high-pressure nitrogen in nitrogen storage tank 29 to 0.3-0.5MPa, and at the same time open the electric control check valve 31. Nitrogen is filled into oil tank 2 through pipeline, forming internal pressure thrust to accelerate oil discharge.

[0053] 2. Three-layer oil drain components are linked: The upper layer pressure-sensing electric valve 38 opens automatically, and the middle and upper layer oil flows into the main oil drain pipe 25 under the action of gravity and nitrogen thrust; the middle layer electromagnetic ball valve 39 and throttle valve 40 are fully open, and the middle layer oil flows quickly; the lower layer electromagnetic gate valve 10 opens, and the motor 5 drives the transmission rod 6 to rotate the oil inlet plate 7 at 5-10 r / min. The silicone scraper 8 scrapes away impurities at the bottom of the oil tank trough 2. The oil and impurities enter the filter plate 12 through the guide groove 9. The spiral guide rib 13 forms a vortex flow to separate the impurities. The filtered oil enters the auxiliary cylinder 21 through the through groove 14, cylinder 15, connecting pipe 19, and telescopic hose 20. The one-way gear pump 23 starts negative pressure suction to send the oil into the main oil drain pipe 25.

[0054] 3. Oil drain direction control: Switching valve 41 diverts the oil to the emergency oil tank to prevent the fire from spreading;

[0055] 4. Safety protection: If the pressure sensor 32 detects a pressure ≥ 0.6MPa, the PLC controller 43 immediately closes the electrically controlled check valve 31 and triggers the pressure relief valve to release pressure; when the float-type oil level sensor 34 detects that the oil level is below the lower limit (oil tank is drained), the electrically controlled check valve 31, the one-way gear pump 23, the oil drain valves of each layer and the pressure relief valve are closed in sequence, and the emergency oil draining is completed.

[0056] II. Routine oil change:

[0057] When the operator sends a "daily oil change" command via the touch screen of control cabinet 42, and the float-type oil level sensor 34 detects that the oil level is ≥ the normal oil level line, the PLC controller 43 starts the daily program.

[0058] 1. Nitrogen circuit closed: The electrically controlled one-way valve 31 remains de-energized and closed to prevent nitrogen pressurization from affecting the purity of oil recovery;

[0059] 2. Layered oil discharge control: The upper layer pressure-sensing electric valve 38 is closed to prevent light impurities from mixing into the recovered oil; the middle layer electromagnetic ball valve 39 is open, and the throttle valve 40 adjusts the flow rate to 20-30 m³ / h to avoid oil splashing; the lower layer electromagnetic gate valve 10 is open, and the oil enters the auxiliary cylinder 21 after being filtered by the filter plate 12. When the float-type oil level sensor 34 detects that the oil level is lower than that of the middle layer main pipe, the one-way gear pump 23 automatically starts to suck up the residual oil.

[0060] 3. Oil recovery: Switch valve 41 is turned to connect to an external oil storage tank or oil filter. The recovered oil can be reused after filtration.

[0061] 4. Oil change: When the oil level drops to the lower limit of oil change, the PLC controller 43 closes the upper and middle layer valves, while the lower layer solenoid gate valve 10 and the one-way gear pump 23 continue to suck up the residual oil, and the daily oil change is completed.

[0062] III. Oil Discharge During Transportation:

[0063] When a manual "transport oil drain" command is sent, and the float-type oil level sensor 34 detects an oil level ≥ the normal oil level line, the PLC controller 43 starts the transport program:

[0064] 1. Low-pressure pressurization: The electrically controlled one-way valve 31 opens, the nitrogen storage tank 29 is pressurized to 0.2MPa, and the residual oil at the bottom of the auxiliary oil tank is discharged;

[0065] 2. Full-stage oil drainage: The upper, middle and lower oil drainage valves open simultaneously, the motor 5 drives the oil inlet plate 7 to rotate and scrape the sludge, and the one-way gear pump 23 runs throughout the process to ensure that the oil and impurities are completely discharged; the spiral guide rib 13 cooperates with the filter plate 12 to prevent impurities from clogging the pipeline.

[0066] 3. Oil collection: Switch valve 41 directs the oil storage tank to collect waste oil.

[0067] 4. Draining and Finishing: When the float-type oil level sensor 34 detects that the oil level has dropped to the lower limit for transportation (residual oil rate <0.5%), the PLC controller 43 sequentially closes the electrically controlled one-way valve 31, the solenoid gate valve 10, the oil drain valves of each layer, and the one-way gear pump 23; remove the connecting screws of baffle 1 26 and baffle 2 27, slide the baffle along the slide groove 28 to open the baffle, take out the filter plate 12 to clean impurities, and the transportation and draining are completed, ensuring that the transformer is lightweight and easy to transport.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0069] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transformer with a rapid oil drainage structure, comprising a transformer body (1), characterized in that: The transformer body (1) has an oil tank groove (2) on its inner wall. A support frame (3) is fixedly mounted on the bottom of the transformer body (1). An auxiliary frame (4) is fixedly mounted on the bottom of the support frame (3). A motor (5) is fixedly mounted on the inner wall of the auxiliary frame (4). A transmission rod (6) is fixedly sleeved on the output shaft of the motor (5). An oil inlet plate (7) is fixedly mounted on the top of the transmission rod (6). The bottom of the oil inlet plate (7) is rotatably connected to the bottom of the inner wall of the oil tank groove (2). A guide groove (9) is opened on the inner wall of the oil inlet plate (7). A silicone scraper (8) is fixedly mounted on the side of the oil inlet plate (7). A circular groove (11) is provided on the side of the groove (9) away from the silicone scraper (8). A filter plate (12) is slidably sleeved on the inner wall of the circular groove (11). A spiral guide rib (13) is fixedly installed on the top of the filter plate (12). A cylinder (15) is fixedly installed on the bottom of the filter plate (12). A roller (18) is movably sleeved on the inner wall of the bottom of the cylinder (15). A connecting pipe (19) is fixedly sleeved on the inner wall of the cylinder (15). The connecting pipe (19) is slidably sleeved with the transmission rod (6). A telescopic hose (20) is installed at the bottom of the connecting pipe (19). A base frame (24) is fixedly installed at the bottom of the transformer body (1).

2. A transformer with a rapid oil drainage structure according to claim 1, characterized in that: A through groove (14) is provided in the middle section between the center and the outer edge of the filter plate (12). The top of the filter plate (12) is connected to the inner wall of the cylinder (15) through the inner wall of the through groove (14). The top of the filter plate (12) is connected to the inner wall of the cylinder (15) through the inner wall of the spiral guide rib (13). The cylinder (15) is fitted with a sealing gasket one (16), and the inner wall of the transformer body (1) is fitted with a sealing gasket two (17). The inner wall of the sealing gasket two (17) is in close contact with the outer edge of the sealing gasket one (16).

3. A transformer with a rapid oil drainage structure according to claim 1, characterized in that: An auxiliary cylinder (21) is fixedly sleeved on the inner wall of the support frame (3). The inner wall of the auxiliary cylinder (21) near the top is rotatably sleeved with the bottom of the telescopic hose (20). A lower oil drain pipe (22) is fixedly sleeved on the inner wall of the auxiliary cylinder (21). A one-way gear pump (23) is connected to the end of the lower oil drain pipe (22) away from the auxiliary cylinder (21). A main oil drain pipe (25) is connected to the end of the one-way gear pump (23) away from the lower oil drain pipe (22) through a connecting pipe. A switching valve (41) is fixedly sleeved on the main oil drain pipe (25).

4. A transformer with a rapid oil drainage structure according to claim 1, characterized in that: The inner wall of the oil tank (2) near the upper layer is connected to a pressure sensing electric valve (38) via a connecting pipe, and the end of the pressure sensing electric valve (38) away from the oil tank (2) is connected to the inner wall of the main drain pipe (25) via a connecting pipe.

5. A transformer with a rapid oil drainage structure according to claim 1, characterized in that: The inner wall of the oil tank (2) near the middle layer is connected to an electromagnetic ball valve (39) via a connecting pipe, and the end of the electromagnetic ball valve (39) away from the oil tank (2) is connected to a throttle valve (40) via a connecting pipe. The end of the throttle valve (40) away from the electromagnetic ball valve (39) is connected to the inner wall of the main drain pipe (25) via a connecting pipe.

6. A transformer with a rapid oil drainage structure according to claim 1, characterized in that: The oil inlet plate (7) is fixedly equipped with an electromagnetic gate valve (10). The inner wall of the oil tank (2) near the bottom is connected to the inner wall of the guide groove (9) through the inner wall of the electromagnetic gate valve (10). There are two electromagnetic gate valves (10), and the two electromagnetic gate valves (10) are diagonally distributed on both sides of the oil inlet plate (7). The connection structure of the two electromagnetic gate valves (10) is completely consistent.

7. A transformer with a rapid oil drainage structure according to claim 1, characterized in that: A nitrogen storage tank (29) is fixedly mounted on the top of the transformer body (1). The outlet of the nitrogen storage tank (29) is connected to a pressure reducing valve (30) through a connecting pipe. The pressure reducing valve (30) is connected to an electrically controlled check valve (31) through a connecting pipe. The electrically controlled check valve (31) is connected to the inner wall of the oil tank (2) through a connecting pipe.

8. A transformer with a rapid oil drainage structure according to claim 1, characterized in that: An oil conservator (33) is fixedly installed at the top of the transformer body (1) away from the nitrogen storage tank (29), and a float-type oil level sensor (34) is fixedly installed on the inner wall of the oil conservator (33). The oil outlet of the oil conservator (33) is connected to a heavy gas relay (35) through a connecting pipe, and the heavy gas relay (35) is connected to the inner wall of the oil tank (2) through a connecting pipe.

9. A transformer with a rapid oil drainage structure according to claim 1, characterized in that: The bottom of the transformer body (1) is provided with a sliding groove (28). A baffle (26) is slidably connected to the inner wall of the sliding groove (28), and a baffle (27) is slidably connected to the side of the sliding groove (28) away from the baffle (26). The baffle (26) and the baffle (27) are connected by screws. The top of the baffle (26) and the baffle (27) are on the same horizontal plane, and the top of the baffle (26) and the top of the baffle (27) overlap with the outer edge of the roller (18).

10. A transformer with a rapid oil drainage structure according to claim 1, characterized in that: A fire detector (36) is installed on the top of the transformer body (1). A light shield (37) is welded to the top of the transformer body (1). A pressure sensor (32) is fixedly installed on the top of the transformer body (1). The probe of the pressure sensor (32) passes through the inner wall of the transformer body (1) and is connected to the inner wall of the oil tank (2). A control cabinet (42) is fixedly installed on the side of the transformer body (1). A PLC controller (43) is installed on the inner wall of the control cabinet (42). The PLC controller (43) is electrically connected to the one-way gear pump (23), the switching valve (41), the pressure sensing electric valve (38), the electromagnetic ball valve (39), the throttle valve (40), the electromagnetic gate valve (10), the pressure reducing valve (30), the electrically controlled one-way valve (31), the float-type oil level sensor (34), the heavy gas relay (35), the fire detector (36), and the pressure sensor (32).

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