An oil-immersed transformer with oil channel cleaning function

Abstract

This invention discloses an oil-immersed transformer with an oil passage cleaning function, comprising a housing for mounting the core and windings, an oil conservator at the upper end of the housing, an oil pump on the side wall of the housing, a blockage-clearing filter assembly for unblocking and cleaning the oil passages on one side of the housing and the oil conservator, a conduit and a trigger assembly for circulating oil connecting the housing and the oil conservator, and a controller at the upper end of the housing. This invention has a simple structure and reasonable design. Firstly, by controlling the pipe diameter, larger winding insulation impurities cannot leave the oil conservator and housing during normal circulation. Then, by adjusting the transformer oil circulation path, the blocking winding insulation impurities are guided into the oil filter for filtration and removal. This avoids prolonged overload and damage to the oil pump or other circulation equipment, effectively extending the service life of the oil pump and circulation equipment and reducing maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of transformer equipment technology, specifically to an oil-immersed transformer with an oil channel cleaning function. Background Technology

[0002] In power systems, transformers, as key equipment for energy conversion and transmission, are crucial for ensuring grid security through stable operation. With the continuous growth of electricity demand and the expanding scale of the power grid, the performance requirements for transformers are also increasing. Oil-immersed transformers, as an important type, are widely used due to their excellent heat dissipation and insulation properties. However, during long-term operation, transformer maintenance and upkeep become a vital link in ensuring the stable operation of the power grid.

[0003] Traditional devices have the following shortcomings:

[0004] Oil-immersed transformers typically consist of a transformer tank, core, windings, and oil conservator. The tank is filled with transformer oil, which serves as both an insulating medium and a heat dissipation medium. To improve heat exchange efficiency, modern oil-immersed transformers generally employ an oil pump to circulate the oil between the tank and the conservator, achieving efficient heat dissipation for the windings and core. However, this oil circulation method also introduces certain problems. Under long-term operation or occasional overload, the winding insulation may gradually age and even develop impurities. These impurities in the winding insulation are usually flaky and easily clog the pipelines during oil circulation, not only affecting oil flow and causing oil pump overload, but also potentially entering the equipment and rapidly damaging the oil pump and other circulation equipment. Therefore, how to effectively remove impurities from the oil channels and prevent pipeline blockage has become a critical issue that urgently needs to be addressed in current oil-immersed transformer technology. Summary of the Invention

[0005] The purpose of this invention is to provide an oil-immersed transformer with an oil channel cleaning function to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an oil-immersed transformer with an oil passage cleaning function, comprising a housing for installing the core and windings, an oil conservator at the upper end of the housing, an oil pump on the side wall of the housing, a blockage-removing filter assembly for unblocking and cleaning the oil passage on one side of the housing and the oil conservator, a conduit and a trigger assembly for circulating oil connected between the housing and the oil conservator, and a controller at the upper end of the housing;

[0007] The blockage-removing filter assembly includes:

[0008] The first regulating valve group is located on one side of the upper end face of the tank. The inlet end of the first regulating valve group is connected to the oil tank by an upper oil extraction pipe and an upper spare pipe, respectively. The inlet end of the first regulating valve group is connected to the tank by a lower oil extraction pipe.

[0009] An oil filter is installed on the side wall of the housing. The inlet of the oil pump is connected to a three-way connector. A first guide pipe is connected between the upper outlet of the first regulating valve group and one inlet of the three-way connector. A second guide pipe is connected between the lower outlet of the first regulating valve group and the input of the oil filter. A third guide pipe is connected between the output of the oil filter and the other inlet of the three-way connector.

[0010] The second regulating valve group is installed on the tank wall on one side of the tank body and its inlet end is connected to the output end of the oil pump through a pipe. The outlet end of the second regulating valve group on one side is connected to the tank body through a lower oil supply pipe, and the outlet end of the second regulating valve group on the other side is connected to the oil tank through an upper oil supply pipe.

[0011] Preferably, the first regulating valve assembly includes;

[0012] The first valve box is mounted on one side of the upper end face of the box body by a bracket. A mounting bracket is provided on one side inside the first valve box. An annular cover is sealed between one side of the mounting bracket and the box wall of the first valve box. A motor is installed inside the annular cover.

[0013] A partition plate is disposed between the inner wall of the first valve box and the outer wall of the annular cover to define the flow path of clean or contaminated transformer oil. The output end of the upper oil extraction pipe passes through one side of the first valve box and is connected to the through hole of the mounting bracket located above the partition plate. The output ends of the upper spare pipe and the lower oil extraction pipe pass through one side of the first valve box and are connected to the through hole of the mounting bracket located below the partition plate.

[0014] A turntable is rotatably connected to the mounting frame and fits and seals the output ends of the upper oil extraction pipe, the upper spare pipe, and the lower oil extraction pipe. The output end of the motor passes through the mounting frame and is connected to one side of the turntable. An oil hole is provided through the turntable.

[0015] Preferably, the second regulating valve assembly includes:

[0016] The second valve box is mounted on the side wall of the box body by a bracket. A positioning plate is provided on the lower end face inside the second valve box. A sealing slide plate is slidably connected in the groove on the lower side of the positioning plate. A sleeve matching the output hole below the second valve box is provided through the sealing slide plate.

[0017] The permanent magnet is disposed on both sides of the sleeve, and electromagnets matching the permanent magnet are symmetrically disposed on both sides of the upper surface of the positioning plate.

[0018] A flexible hose is connected between the upper end of the sleeve and the inlet end of the second valve box.

[0019] Preferably, the triggering component includes:

[0020] A connecting sleeve, the two ends of which are respectively connected to the upper end of the housing and the lower end of the oil tank. A touch switch is provided on the inner wall of the connecting sleeve, and a slider for triggering the switch is slidably connected inside the connecting sleeve below the touch switch.

[0021] A reset spring is disposed at both ends of the connecting sleeve and connected to both ends of the slider;

[0022] A flow rate sensor is disposed inside the oil conservator.

[0023] Preferably, a seepage-proof zone is provided between the mounting bracket and one side wall of the first valve box, and a discharge port for draining leaked transformer oil is provided at the lower end of the seepage-proof zone.

[0024] Preferably, the first valve box has heat dissipation holes on one side of the annular cover on its box wall.

[0025] Preferably, sealing rings that fit against the turntable are provided on the output end faces of the upper sucker pipe, the upper spare pipe and the lower sucker pipe, as well as on both sides inside the through hole of the mounting bracket.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. This invention, by incorporating a blockage-removing filter component, firstly prevents larger winding insulation impurities from leaving the oil conservator and tank during normal circulation by controlling the pipe diameter. Then, by adjusting the transformer oil circulation path, the winding insulation impurities causing blockages are introduced into the oil filter for filtration and removal. Regardless of whether the blockage is located at the lower end of the conduit inside the tank or at the oil inlet end of the upper oil suction pipe inside the oil conservator, it can be effectively discharged and filtered out. This avoids prolonged overload and damage to the oil pump or other circulation equipment, effectively extends the service life of the oil pump and circulation equipment, reduces maintenance costs, and significantly improves the overall operating efficiency and working stability of the transformer.

[0028] 2. This invention, by setting a first regulating valve group, uses the rotation of the turntable to drive the independent oil holes opened on the turntable to connect with the corresponding pipes, realizing the rapid switching of the oil circuit in the valve box. At the same time, the transformer oil discharge channel is divided into clean and dirty paths by using a partition plate. The logic is clear, which simplifies the layout of subsequent pipelines. Moreover, the overall connection structure is simple, the design is reasonable, and the maintenance is convenient, which is more in line with the actual use needs of current oil-immersed transformers.

[0029] 3. This invention, by setting a second regulating valve group, uses the magnetic force of an electromagnet to control the horizontal movement of the hose output end within the second valve box, thereby realizing the rapid switching of the hose connection between the lower oil supply pipe and the upper oil supply pipe, ensuring that the transformer oil can be accurately delivered to the oil tank or tank body, with flexible, stable and reliable control.

[0030] 4. This invention, by incorporating a triggering component and combining a flow rate sensor and a touch switch, monitors the oil flow status and system pressure changes in real time. When a blockage occurs in the corresponding part of the oil circuit, the controller can respond quickly and issue a command, further improving the overall safety and stability of the equipment. Attached Figure Description

[0031] Figure 1 This is an overall perspective view of the present invention;

[0032] Figure 2 This is an overall side view of the present invention;

[0033] Figure 3 This is an overall top view of the present invention;

[0034] Figure 4 This is a front view schematic diagram of the internal structure of the present invention;

[0035] Figure 5 For the present invention Figure 4 An enlarged view of point A in the diagram;

[0036] Figure 6 For the present invention Figure 4 An enlarged schematic diagram at point B;

[0037] Figure 7 For the present invention Figure 4 Enlarged view of point C;

[0038] Figure 8 This is a three-dimensional schematic diagram of the internal structure of the first regulating valve assembly of the present invention;

[0039] Figure 9 For the present invention Figure 8 An enlarged diagram at point D;

[0040] Figure 10 This is a schematic diagram of the partition plate installation according to the present invention;

[0041] Figure 11 This is a three-dimensional schematic diagram of the internal structure of the second regulating valve assembly of the present invention;

[0042] Figure 12 This is a schematic diagram of the normal circulation of transformer oil according to the present invention;

[0043] Figure 13 This is a schematic diagram of the transformer oil drainage and filtration circulation after the conduit becomes blocked, according to the present invention.

[0044] Figure 14 This is a schematic diagram of the transformer oil drainage and circulation after the upper oil extraction pipe is blocked, according to the present invention.

[0045] In the diagram: 1. Housing; 2. Oil tank; 3. Oil pump; 4. Clog-removing filter assembly; 401. Upper oil suction pipe; 402. Upper spare pipe; 403. Lower oil suction pipe; 404. Oil filter; 405. T-joint; 406. First guide pipe; 407. Second guide pipe; 408. Third guide pipe; 409. Lower oil delivery pipe; 410. Upper oil delivery pipe; 5. Guide tube; 6. Trigger assembly; 601. Connecting sleeve; 602. Touch switch; 603. Slider; 604. Return spring; 605. Flow rate 7. Sensor; 8. Controller; 9. First regulating valve group; 10. First valve box; 11. Heat dissipation hole; 12. Mounting bracket; 13. Annular cover; 14. Motor; 15. Divider plate; 16. Turntable; 17. Oil hole; 18. Second regulating valve group; 19. Second valve box; 10. Positioning plate; 11. Sealing slide plate; 12. Sleeve; 13. Permanent magnet; 14. Electromagnet; 15. Hoses; 16. Leakage prevention zone; 17. Discharge port; 18. Sealing ring. Detailed Implementation

[0046] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0047] It should be noted that when an element is referred to as "fixed," "mounted," "connected," or "set" with another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0048] As a further improvement of the present invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0049] Please see Figure 1-14 As shown, this invention provides a technical solution for an oil-immersed transformer with an oil passage cleaning function: An oil-immersed transformer with an oil passage cleaning function includes a housing 1 for installing the core and windings. An oil conservator 2 is fixedly installed on the upper end of the housing 1 by a bracket. An oil pump 3 is installed on the side wall of the housing 1. A blockage-clearing and filtering assembly 4 for unblocking and cleaning the transformer oil passage is installed on one side of the housing 1 and the oil conservator 2. A conduit 5 for circulating oil and a trigger assembly 6 are connected between the housing 1 and the oil conservator 2. A controller 7 is installed on the upper end of the housing 1. The blockage-clearing and filtering assembly 4 includes a first regulating valve group 8, an oil filter 404, and a second regulating valve group 9. The first regulating valve group 8 is installed on one side of the upper end face of the tank 1. The inlet end of the first regulating valve group 8 is connected to the upper oil extraction pipe 401 and the upper standby pipe 402 respectively. When the transformer oil in the oil tank 2 flows normally into the tank 1, the transformer oil in the oil tank 2 is extracted through the upper oil extraction pipe 401. When the end of the upper oil extraction pipe 401 is blocked, the transformer oil in the oil tank 2 is extracted through the upper standby pipe 402. The inlet end of the first regulating valve group 8 is connected to the tank 1 through the lower oil extraction pipe 403. The oil inlet end of the lower oil extraction pipe 403 is located at the bottom of the tank 1. The oil filter 404 is fixedly installed on one side wall of the housing 1. The inlet end of the oil pump 3 is connected to a three-way connector 405. A first guide pipe 406 is connected between the upper outlet end of the first regulating valve group 8 and one inlet of the three-way connector 405 to guide clean transformer oil. A second guide pipe 407 is connected between the lower outlet end of the first regulating valve group 8 and the input end of the oil filter 404 to guide the transformer oil to be filtered. A third guide pipe 408 is connected between the output end of the oil filter 404 and the other inlet of the three-way connector 405 to guide the filtered transformer oil. The second regulating valve group 9 is installed on one side wall of the housing 1, and its inlet end is connected to the output end of the oil pump 3 through a pipe to control the output direction of the clean transformer oil output by the oil pump 3. A lower oil delivery pipe 409 is connected between the outlet end of one side of the second regulating valve group 9 and the lower oil inlet hole of the housing 1. An upper oil delivery pipe 410 is connected between the outlet end of the second regulating valve group 9 on the other side and the oil conservator 2.

[0050] The diameter of the upper oil extraction pipe 401 and the conduit 5 should be smaller than the pipe diameter in the overall pipeline to ensure that when impurities fall off the winding insulation, they can be accurately captured by the conduit 5 or the upper oil extraction pipe 401, so as to avoid them being circulated into the oil pump 3 and causing damage to the oil pump 3. A filter screen may be considered for the upper oil extraction pipe 401.

[0051] like Figure 12 As shown, when the transformer is working normally, the tank 1 is filled with transformer oil, while the oil conservator 2 should not be filled with transformer oil to allow sufficient space for thermal expansion and contraction of the oil. Under the negative pressure of the oil pump 3, the transformer oil is drawn from the oil conservator 2 through the upper oil extraction pipe 401, and then enters the oil pump 3 and the second regulating valve group 9 in sequence through the first regulating valve group 8 and the first guide pipe 406. Then, it enters the lower end of the tank 1 through the lower oil delivery pipe 409. Since the tank 1 is filled with oil, as the oil pressure increases, the oil in the tank 1 flows back into the oil conservator 2 through the conduit 5 to dissipate heat from the windings and core inside the tank 1.

[0052] During the operation of the transformer, if the oil circuit is blocked by impurities in the winding insulation, due to the flow path of the oil and the limitations of the diameter of the upper oil extraction pipe 401 and the conduit 5, and because the impurities in the winding insulation can only be generated on the windings inside the tank 1, the blockage generally occurs at the lower end of the conduit 5 inside the tank 1. In rare cases, the blockage will occur at the oil inlet end of the upper oil extraction pipe 401 inside the oil conservator 2.

[0053] When the lower end of conduit 5 is blocked by winding insulation impurities, the oil cannot flow upwards into the oil conservator 2. Controller 7 controls the first regulating valve group 8 to close the upper oil extraction pipe 401, and creates a passage between the lower oil extraction pipe 403, the second guide pipe 407, the oil filter 404, and the oil pump 3. Simultaneously, controller 7 controls the second regulating valve group 9 to output the transformer oil input by the oil pump 3 through the upper oil delivery pipe 410. At this time, a negative pressure is formed at the port of the lower oil extraction pipe 403 under the action of the oil pump 3, and the flow path of the transformer oil is as follows... Figure 13 As shown, the transformer oil in tank 1 is drawn out by the lower oil extraction pipe 403, passes through the second guide pipe 407, and enters the oil filter 404 for filtration. Then, it passes through the oil pump 3 and enters the second regulating valve group 9, and finally enters the oil conservator 2 through the upper oil delivery pipe 410. Because the oil in tank 1 is continuously drawn out from below, filtered by the oil filter 404, and returned to the oil conservator 2, the oil pressure in tank 1 decreases. The oil in the oil conservator 2 flows downwards into tank 1 through the conduit 5, and any blockages at the lower end of the conduit 5 are carried out and filtered out by the oil filter 404 as the oil circulates.

[0054] When the inlet end of the upper oil extraction pipe 401 is blocked by winding insulation impurities, the controller 7 controls the first regulating valve group 8 to close the upper oil extraction pipe 401, and creates a passage between the upper standby pipe 402, the second guide pipe 407, the oil filter 404, and the oil pump 3. Simultaneously, the controller 7 controls the second regulating valve group 9 to change the output oil pipe to the lower oil delivery pipe 409. At this time, the end of the upper standby pipe 402 located inside the oil conservator 2 forms a negative pressure under the action of the oil pump 3, and the flow path of the transformer oil is as follows... Figure 14 As shown, the transformer oil in the oil conservator 2 is drawn out by the upper standby pipe 402, enters the oil filter 404 through the second guide pipe 407 for filtration, and then enters the lower end of the tank 1 through the lower oil supply pipe 409. As the oil pressure in the tank 1 increases, the oil flows back into the oil conservator 2 through the conduit 5 for circulation. During the circulation of the transformer oil, impurities at the oil inlet of the upper oil extraction pipe 401 are also drawn out by the upper standby pipe 402 along with the circulation of the oil and filtered out by the oil filter 404.

[0055] By using the unblocking filter assembly 4, larger winding insulation impurities are prevented from leaving the oil conservator 2 and tank 1 during normal circulation by controlling the pipe diameter. Then, by adjusting the transformer oil circulation path, the winding insulation impurities causing the blockage are introduced into the oil filter 404 for filtration and removal. Regardless of whether the blockage is at the lower end of the conduit 5 inside the tank 1 or at the oil inlet end of the upper oil suction pipe 401 inside the oil conservator 2, it can be effectively discharged and filtered out. This avoids long-term overload and damage to the oil pump 3 or other circulation equipment, effectively extends the service life of the oil pump 3 and circulation equipment, reduces maintenance costs, and significantly improves the overall operating efficiency and working stability of the transformer.

[0056] The first regulating valve assembly 8 includes a first valve box 801, a partition plate 805, and a turntable 806. The first valve box 801 is mounted on one side of the upper end face of the housing 1 via a bracket. A mounting bracket 802 is fixedly mounted on one side inside the first valve box 801. The mounting bracket 802 has three through holes for transformer oil to pass through. An annular cover 803 is sealed between one side of the mounting bracket 802 and the housing wall of the first valve box 801. A motor 804 is fixed inside the annular cover 803 via a bracket. The turntable 806 is rotatably connected to the mounting bracket 802 and fits and seals the output ends of the upper oil extraction pipe 401, the upper spare pipe 402, and the lower oil extraction pipe 403. The output end of the motor 804 passes through the mounting bracket 802 and connects to one side of the turntable 806. An oil hole 807 is provided through the turntable 806.

[0057] A separator plate 805 is sealed between the inner wall of the first valve box 801 and the outer wall of the annular cover 803 to define the flow path of clean or contaminated transformer oil. The output end of the upper oil extraction pipe 401 passes through one side of the first valve box 801 and connects to the through hole of the mounting bracket 802 located above the separator plate 805. The output ends of the upper spare pipe 402 and the lower oil extraction pipe 403 pass through one side of the first valve box 801 and connect to the through hole of the mounting bracket 802 located below the separator plate 805. Clean transformer oil extracted by the upper oil extraction pipe 401 can only flow above the separator plate 805. The first guide pipe 406 is used to directly guide the transformer oil above the separator plate 805 to the oil pump 3. Transformer oil requiring filtration extracted by the upper spare pipe 402 or the lower oil extraction pipe 403 can only flow below the separator plate 805. The second guide pipe 407 is used to guide the transformer oil below the separator plate 805 to the oil filter 404 for filtration.

[0058] like Figure 8 As shown, there is only one oil hole 807. The motor 804 is used to drive the turntable 806 to rotate inside the mounting bracket 802. Since the ports of the upper oil extraction pipe 401, the upper spare pipe 402, and the lower oil extraction pipe 403 are connected to the through holes on the mounting bracket 802, the oil hole 807 connects to whichever pipe port as the turntable 806 rotates. This pipe can then discharge oil to the left side of the first valve box 801 under the negative pressure suction of the oil pump 3, achieving different circulation purposes.

[0059] Through the first regulating valve group 8, the rotation of the turntable 806 drives the independent oil hole 807 opened on the turntable 806 to connect with the corresponding pipeline, realizing the rapid switching of the oil circuit in the valve box. At the same time, the separator plate 805 is used to divide the transformer oil discharge channel into clean and dirty paths. The logic is clear, which simplifies the subsequent pipeline layout. Moreover, the overall connection structure is simple, the design is reasonable, and the maintenance is convenient, which is more in line with the actual use requirements of current oil-immersed transformers.

[0060] The second regulating valve assembly 9 includes a second valve box 901, a permanent magnet 905, and a hose 907. The second valve box 901 is mounted on the side wall of the housing 1 via a bracket. A positioning plate 902 is fixedly mounted on the lower end face inside the second valve box 901. A sealing slide plate 903 is slidably connected in a groove on the lower side of the positioning plate 902. The groove shape and the contour of the sealing slide plate 903 match, restricting the sealing slide plate 903 to move stably only horizontally within the groove. A sleeve 904, matching the output port below the second valve box 901, is installed through the sealing slide plate 903. The permanent magnet 905 is mounted on both sides of the sleeve 904. Electromagnets 906, matching the permanent magnet 905, are symmetrically mounted on both sides of the upper end face of the positioning plate 902. The hose 907 connects the upper end of the sleeve 904 to the inlet end of the second valve box 901.

[0061] The lower oil supply pipe 409 and the upper oil supply pipe 410 are respectively connected to the output holes below the second valve box 901. When the transformer oil circulates, the electromagnet 906 remains energized. One side of the electromagnet 906 attracts the permanent magnet 905, while the other side of the electromagnet 906 repels the permanent magnet 905, so that the sleeve 904 is stabilized above the lower oil supply pipe 409 or the upper oil supply pipe 410. At this time, the hose 907 is fully connected to the lower oil supply pipe 409 or the upper oil supply pipe 410. The transformer oil output by the oil pump 3 can be output through the hose 907 to the designated oil supply pipe and enter the tank 1 or the oil conservator 2. When it is necessary to change the output oil supply pipe, the controller 7 controls the change of the current direction on the electromagnet 906. The direction of the force on the permanent magnets 905 on both sides of the sleeve 904 is reversed. At this time, the sleeve 904 will move upward to the other side of the oil supply pipe until the hose 907 is fully connected to the lower oil supply pipe. During the movement of the sleeve 904, the sealing slide plate 903 remains stable within the groove below the positioning plate 902.

[0062] The output end of the hose 907 is moved horizontally within the second valve box 901 by the magnetic force of the electromagnet 906 through the second regulating valve group 9, thereby realizing the rapid switching of the connection between the hose 907 and the lower oil supply pipe 409 and the upper oil supply pipe 410, ensuring that the transformer oil can be accurately delivered to the oil tank 2 or the housing 1, with flexible, stable and reliable control.

[0063] The triggering assembly 6 includes a connecting sleeve 601, a return spring 604, and a flow rate sensor 605. The two ends of the connecting sleeve 601 are connected to the upper end of the housing 1 and the lower end of the oil tank 2, respectively. A touch switch 602 is installed on the inner wall of the connecting sleeve 601. A slider 603 for triggering the touch switch 602 is slidably connected inside the connecting sleeve 601 below the touch switch 602. The upper and lower ends of the connecting sleeve 601 are connected to the oil tank 2 and the housing 1, respectively. The return spring 604 is movably installed at both ends of the connecting sleeve 601 and connected to both ends of the slider 603 to stabilize the position of the slider 603. The flow rate sensor 605 is installed inside the oil tank 2.

[0064] When the lower end of the conduit 5 is blocked, as the oil pump 3 continues to pressurize, the oil pressure below the housing 1 increases, pushing the slider 603 to move upward against the elastic force of the return spring 604 until the slider 603 contacts the upper touch switch 602. After receiving the electrical signal from the upper touch switch 602, the controller 7 determines that the lower end of the conduit 5 is blocked and can then issue subsequent commands to the electromagnet 906 and the motor 804.

[0065] When the oil inlet of the upper oil pipe 401 is blocked, the controller 7 detects through the flow rate sensor 605 that the oil in the oil tank 2 has stopped flowing and the touch switch 602 is not triggered. Then it is determined that the oil inlet of the upper oil pipe 401 is blocked and subsequent commands can be issued to the electromagnet 906 and the motor 804.

[0066] By using the combination of the flow rate sensor 605 and the touch switch 602, the flow state of the oil and the changes in system pressure are monitored in real time through the trigger component 6. When the corresponding part in the oil circuit is blocked, the controller 7 can respond quickly and issue a command, which further improves the overall safety and stability of the equipment.

[0067] A seepage-proof zone 10 is provided between the mounting frame 802 and one side wall of the first valve box 801. A discharge port 1001 for draining leaked transformer oil is installed at the lower end of the seepage-proof zone 10. When leakage occurs at the connection of the upper oil extraction pipe 401, the upper standby pipe 402 and the lower oil extraction pipe 403, the oil can be collected in the seepage-proof zone 10 and discharged through the discharge port 1001 later to prevent environmental pollution.

[0068] The first valve box 801 has a heat dissipation hole 8011 on one side of the annular cover 803 on the box wall. The heat dissipation hole 8011 is used to ensure the heat dissipation of the motor 804 and improve the overall service life of the motor 804.

[0069] Sealing rings 11, which fit snugly against the turntable 806, are installed on the output end faces of the upper oil extraction pipe 401, the upper standby pipe 402, and the lower oil extraction pipe 403, as well as on both sides inside the through hole of the mounting bracket 802. Transformer oil has a certain viscosity and, under normal circumstances, will not leak from the connection points of the upper oil extraction pipe 401, the upper standby pipe 402, the lower oil extraction pipe 403, the turntable 806, and the mounting bracket 802. Even if a small amount leaks into other oil circuits, it will not have an adverse effect on other pipelines, and there will be no leakage to the outside of the first valve box 801. The sealing rings 11 further enhance the sealing performance of this part and improve the working efficiency.

[0070] The controller 7 is electrically connected to the motor 804, oil filter 404, electromagnet 906, touch switch 602 and flow sensor 605 via wires to send and receive electrical signals.

[0071] Working principle: If the lower end of the conduit 5 is blocked, the oil pressure below the housing 1 increases, pushing the slider 603 to move upward against the spring force of the return spring 604 until the slider 603 contacts the upper touch switch 602. Upon receiving the electrical signal from the upper touch switch 602, the controller 7 determines that the lower end of the conduit 5 is blocked. Subsequently, the controller 7 controls the motor 804 to start, causing the turntable 806 to rotate at a certain angle, aligning the oil hole 807 with the lower oil extraction pipe 403 and sealing the upper oil extraction pipe 401. Simultaneously, the controller 7 controls the change in the current direction of the electromagnet 906 to move the sleeve 904 and hose 907 to connect with the upper oil delivery pipe 410. At this time... Figure 13As shown, a negative pressure is formed at the port of the lower oil extraction pipe 403 under the action of the oil pump 3. The transformer oil in the tank 1 is drawn out by the lower oil extraction pipe 403 and enters the oil filter 404 through the second guide pipe 407 for filtration. Impurities are also carried into the oil filter 404. Then, it is pressurized by the oil pump 3 and fed into the hose 907 and the upper oil supply pipe 410, and then fed into the oil conservator 2 through the upper oil supply pipe 410. After circulating and filtering for a certain period of time, the original circulation mode can be restored.

[0072] If the inlet of the upper oil extraction pipe 401 is blocked, the controller 7 detects through the flow rate sensor 605 that the oil in the oil tank 2 has stopped flowing, and the touch switch 602 is not triggered, thus determining that the inlet of the upper oil extraction pipe 401 is blocked. Subsequently, the controller 7 controls the motor 804 to start, driving the turntable 806 to rotate at a certain angle so that the oil hole 807 aligns with the upper spare pipe 402, sealing the upper oil extraction pipe 401. When the inlet of the upper oil extraction pipe 401 is blocked, the positions of the sleeve 904 and the hose 907 do not need to be adjusted; they only need to remain connected to the lower oil delivery pipe 409. At this time, if... Figure 14 As shown, the upper standby pipe 402, located at one end inside the oil conservator 2, forms a negative pressure under the action of the oil pump 3. The transformer oil in the oil conservator 2 is drawn out by the upper standby pipe 402, passes through the second guide pipe 407 and enters the oil filter 404 for filtration. Then, it enters the lower end of the tank 1 through the lower oil supply pipe 409. As the oil pressure in the tank 1 increases, the oil flows back into the oil conservator 2 through the conduit 5 for circulation. During the circulation of the transformer oil, impurities at the oil inlet end of the upper oil extraction pipe 401 are also drawn out by the upper standby pipe 402 along with the circulation of the oil and filtered out by the oil filter 404. After a certain period of circulation and filtration, the original circulation mode can be restored.

[0073] 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.

[0074] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An oil-immersed transformer with oil channel cleaning function, comprising a housing (1) for mounting the core and windings, wherein an oil conservator (2) is provided at the upper end of the housing (1), characterized in that: An oil pump (3) is provided on the side wall of the housing (1). A filter assembly (4) for unblocking and cleaning the oil passage is provided on one side of the housing (1) and the oil conservator (2). A conduit (5) for circulating oil and a trigger assembly (6) are connected between the housing (1) and the oil conservator (2). A controller (7) is provided at the upper end of the housing (1). The blockage-removing filter assembly (4) includes: The first regulating valve group (8) is located on one side of the upper end face of the tank (1). The inlet end of the first regulating valve group (8) is connected to the oil tank (2) by an upper oil extraction pipe (401) and an upper spare pipe (402). The inlet end of the first regulating valve group (8) is connected to the tank (1) by a lower oil extraction pipe (403). Oil filter (404) is installed on the side wall of the housing (1). The inlet end of the oil pump (3) is connected to a three-way connector (405). The upper outlet end of the first regulating valve group (8) is connected to one inlet of the three-way connector (405) via a first guide pipe (406). The lower outlet end of the first regulating valve group (8) is connected to the input end of the oil filter (404) via a second guide pipe (407). The output end of the oil filter (404) is connected to the other inlet of the three-way connector (405) via a third guide pipe (408). The second regulating valve group (9) is set on the side wall of the housing (1) and the inlet end is connected to the output end of the oil pump (3) through a pipe. The outlet end of the second regulating valve group (9) is connected to the housing (1) by a lower oil supply pipe (409), and the outlet end of the second regulating valve group (9) on the other side is connected to the oil pillow (2) by an upper oil supply pipe (410).

2. The oil-immersed transformer with oil channel cleaning function according to claim 1, characterized in that: The first regulating valve assembly (8) includes: The first valve box (801) is mounted on one side of the upper end face of the box body (1) by a bracket. A mounting bracket (802) is provided on one side inside the first valve box (801). An annular cover (803) is sealed between one side of the mounting bracket (802) and the box wall of the first valve box (801). A motor (804) is provided inside the annular cover (803). A partition plate (805) is disposed between the inner wall of the first valve box (801) and the outer wall of the annular cover (803) to define the flow path of clean or contaminated transformer oil. The output end of the upper oil extraction pipe (401) passes through one side of the first valve box (801) and is connected to the through hole of the mounting bracket (802) above the partition plate (805). The output ends of the upper spare pipe (402) and the lower oil extraction pipe (403) pass through one side of the first valve box (801) and are connected to the through hole of the mounting bracket (802) below the partition plate (805). A turntable (806) is rotatably connected to the mounting bracket (802) and fits and seals the output ends of the upper oil extraction pipe (401), the upper spare pipe (402) and the lower oil extraction pipe (403). The output end of the motor (804) passes through the mounting bracket (802) and is connected to one side of the turntable (806). An oil hole (807) is provided through the turntable (806).

3. The oil-immersed transformer with oil channel cleaning function according to claim 1, characterized in that: The second regulating valve assembly (9) includes: The second valve box (901) is mounted on the side wall of the box body (1) by a bracket. A positioning plate (902) is provided on the lower end face inside the second valve box (901). A sealing slide plate (903) is slidably connected in the groove on the lower side of the positioning plate (902). A sleeve (904) matching the output hole below the second valve box (901) is provided through the sealing slide plate (903). Permanent magnet (905), the permanent magnet (905) is disposed on both sides of the sleeve (904), and electromagnets (906) matching the permanent magnet (905) are symmetrically disposed on both sides of the upper end face of the positioning plate (902). A hose (907) is connected between the upper end of the sleeve (904) and the inlet end of the second valve box (901).

4. The oil-immersed transformer with oil channel cleaning function according to claim 1, characterized in that: The triggering component (6) includes: A connecting sleeve (601) is provided with its two ends connected to the upper end of the housing (1) and the lower end of the oil tank (2) respectively. A touch switch (602) is provided on the inner wall of the connecting sleeve (601). A slider (603) for triggering the switch is slidably connected inside the connecting sleeve (601) below the touch switch (602). A reset spring (604) is disposed at both ends of the connecting sleeve (601) and connected to both ends of the slider (603); A flow rate sensor (605) is disposed inside the oil conservator (2).

5. The oil-immersed transformer with oil channel cleaning function according to claim 2, characterized in that: A seepage-proof zone (10) is provided between the mounting bracket (802) and one side wall of the first valve box (801), and a discharge port (1001) for discharging leaked transformer oil is provided at the lower end of the seepage-proof zone (10).

6. The oil-immersed transformer with oil channel cleaning function according to claim 2, characterized in that: The first valve box (801) has a heat dissipation hole (8011) on one side of the annular cover (803) on the box wall.

7. The oil-immersed transformer with oil channel cleaning function according to claim 2, characterized in that: Sealing rings (11) that fit with the turntable (806) are provided on both sides of the output end face of the upper oil extraction pipe (401), the upper spare pipe (402) and the lower oil extraction pipe (403) and inside the through hole of the mounting bracket (802).

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