An oil immersed transformer

Abstract

The present invention discloses an oil-immersed transformer, belonging to the field of transformers. An oil-immersed transformer comprises an oil tank and feet connected to the four corners of the bottom of the oil tank, a winding is arranged in the oil tank, an outer side of the oil tank is connected to an oil pillow through an oil inlet pipe, and the outer wall of the oil tank is provided with equidistant arrays of heat dissipating fins, and one side of the bottom of the oil tank is connected to an oil drain pipe, and further comprises: a cleaning component for removing dust on the surface of the heat dissipating fins; a dredging component for preventing the oil inlet pipe and the oil drain pipe from being blocked, and the dredging component and the cleaning component act synchronously; the present invention fills the airbag after the internal pressure generated by the transformer itself is released, and uses the expansion of the airbag to drive the cleaning racks on the upper and lower sides of the heat dissipating fins and the scraper arranged in the cleaning rack to move in contact with the heat dissipating fins, so as to clean the surface of the heat dissipating fins and dissipate the heat to the outside in time; at the same time, the cleaning component is used to drive the dredging rod to dredge the oil inlet pipe and the oil drain pipe to avoid pipe blockage.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, and in particular to an oil-immersed transformer. Background Art

[0002] Transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are primary coil, secondary coil and iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. Transformers can be divided into: distribution transformers, power transformers, fully sealed transformers, combined transformers, dry transformers, oil-immersed transformers, single-phase transformers, electric furnace transformers, rectifier transformers, reactors, anti-interference transformers, lightning protection transformers, box-type transformer test transformers, corner transformers, high current transformers, excitation transformers, etc. Transformers are basic equipment for power transmission and distribution, and are widely used in industries, agriculture, transportation, urban communities and other fields. Among them, the three-phase oil-immersed transformer is a type of transformer. The three-phase oil-immersed transformer adopts a fully oil-filled sealed corrugated oil tank shell, which is a permanently sealed oil tank that adapts to the expansion of oil with its own elasticity. Oil-immersed transformers have been widely used in various power distribution equipment.

[0003] Most of the existing oil-immersed transformers are equipped with equidistant arrays of fins on the outside of the oil tank for heat dissipation. This form of heat dissipation is basically static and passive, and the heat dissipation effect is very limited. In addition, during long-term use, dust and impurities are easily attached to the surface of the fins, resulting in heat that cannot be dissipated to the outside in time, causing local overheating inside the oil tank, and then causing the transformer oil to decompose and produce gas that expands in the oil tank, increasing the difficulty of heat dissipation of the transformer and affecting the use of the transformer. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the heat dissipation effect in the prior art is very limited, and dust and impurities are easily attached to the surface of the fins during long-term use, resulting in heat being unable to be dissipated to the outside in time, and an oil-immersed transformer is proposed.

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

[0006] An oil-immersed transformer comprises an oil tank and feet connected to the four corners of the bottom of the oil tank, a winding is arranged in the oil tank, an outer side of the oil tank is connected to an oil pillow through an oil inlet pipe, and the outer wall of the oil tank is provided with equidistant arrays of heat dissipating fins, one side of the bottom of the oil tank is connected to an oil drain pipe, and also includes: a cleaning component for removing dust on the surface of the heat dissipating fins; a dredging component to prevent the oil inlet pipe and the oil drain pipe from being blocked, and the dredging component and the cleaning component act synchronously.

[0007] Preferably, the cleaning assembly includes an airbag, the two ends of which are respectively fixedly connected with an upper support plate and a lower support plate, the upper support plate and the lower support plate are slidably connected to the oil tank, the upper support plate and the lower support plate are both connected to a cleaning frame, a scraper is arranged in the cleaning frame, and the scraper and the heat dissipation fins are arranged in close contact.

[0008] Furthermore, the top end of the airbag is connected to the oil tank through a connecting pipe, a pressure valve is connected in the connecting pipe, a spiral air pipe is connected between the connecting pipe and the airbag, and one end of the airbag is connected to an exhaust valve.

[0009] In order to minimize the contact / covering area between the cleaning frame and the heat dissipation fins, further, the cleaning assembly and the cleaning frame are arranged in a U-shaped plate structure, and notches are provided on both sides of the cleaning frame, and the scraper is detachably installed in the notches.

[0010] Furthermore, the cleaning rack is symmetrically arranged on the upper and lower sides of the heat dissipation fins, the cleaning rack on the side away from the airbag and the upper support plate are connected by an upper connecting rod, and the cleaning rack on the side away from the airbag and the lower support plate are connected by a lower connecting rod, and the upper connecting rod and the lower connecting rod are fixedly connected to other groups of cleaning racks through support rods respectively.

[0011] In order to ensure smooth telescopic and sliding of the airbag during the process of filling or exhausting gas, further, a track is fixedly installed on the outer wall of the fuel tank, and an upper moving block and a lower moving block are slidably installed in the track respectively, the upper support plate and the upper moving block are fixedly connected, and the lower support plate and the lower moving block are fixedly connected, and an upper microswitch and a lower microswitch are respectively installed on the outer wall of the fuel tank near the upper and lower ends of the track, and the exhaust valve is electrically connected to the lower microswitch and the upper microswitch.

[0012] Preferably, a dredging rod is slidably installed in the oil tank, and the dredging rod is integrally formed into a U-shaped rod structure by two groups of vertical rods and one group of horizontal rods, wherein one group of the vertical rods is slidably connected to the oil tank top cover and the bottom plate of the oil tank through linear bearings, and the other group of the vertical rods are vertically arranged in the oil inlet pipe and the oil outlet pipe.

[0013] In order to reduce driving components and simplify the internal structure of the transformer, further, the upper connecting rod and the lower connecting rod are connected through a synchronous rod and one group of vertical rods.

[0014] Preferably, an oil mixing rod acting vertically on the oil is provided in the oil tank, grooves are symmetrically provided on both sides of the oil mixing rod, and rods are inserted in an equidistant array in the grooves.

[0015] In order to facilitate disassembly of the connection structure, further, a three-way pipe is connected to the surface of the dredging rod, and one end of the oil mixing rod and the three-way pipe are fixedly connected by an elastic pin.

[0016] Compared with the prior art, the present invention provides an oil-immersed transformer, which has the following beneficial effects:

[0017] 1. The oil-immersed transformer fills the airbag after the internal pressure generated by the transformer itself is released. During the expansion of the airbag, the cleaning racks on the upper and lower sides of the heat sink fins and the scrapers arranged in the cleaning racks move in accordance with the heat sink fins, thereby cleaning the surface of the heat sink fins, and finally allowing the heat sink fins to dissipate the heat generated by the transformer to the outside in a timely manner;

[0018] 2. The oil-immersed transformer is provided with a U-shaped rod structure dredging rod formed by two sets of vertical rods and one set of horizontal rods. During its vertical movement, the oil inlet pipe and the oil outlet pipe can be dredged to avoid pipe blockage;

[0019] 3. The oil-immersed transformer connects the dredging rod and the oil mixing rod through a three-way pipe arranged on the surface of the dredging rod. During the vertical lifting of the dredging rod, the oil mixing rod is driven to act in the oil to mix the upper oil and the lower oil to a certain extent, so as to make the heat in the oil tank as evenly distributed as possible, and finally dissipate it to the outside in time through the heat dissipation fins. The use of the oil mixing rod can further promote heat dissipation.

[0020] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The present invention utilizes the cleaning assembly and the oil mixing rod in sequence to improve the heat dissipation effect of the transformer to varying degrees. At the same time, during the use of the cleaning assembly, the dredging rod is driven to move vertically in the oil inlet pipe and the oil discharge pipe to dredge the oil inlet pipe and the oil discharge pipe to avoid pipe blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the main viewing direction of the three-dimensional structure of an oil-immersed transformer proposed by the present invention;

[0022] Figure 2 The invention provides an oil-immersed transformer Figure 1 The enlarged structural diagram of part A in the middle;

[0023] Figure 3 A schematic diagram of the three-dimensional structure of the air bag and oil tank connection of an oil-immersed transformer proposed by the present invention

[0024] Figure 4 A schematic diagram of the side structure of an air bag of an oil-immersed transformer proposed by the present invention

[0025] Figure 5 A schematic diagram of the structure of an oil-immersed transformer airbag inflated to the limit position according to the present invention

[0026] Figure 6A schematic diagram of the three-dimensional structure of a dredging assembly for an oil-immersed transformer proposed by the present invention

[0027] Figure 7 Schematic diagram of the arrangement structure of the dredging assembly and the oil mixing rod of an oil-immersed transformer proposed by the present invention

[0028] Figure 8 This is a schematic diagram of the three-dimensional structure of an oil-mixing rod of an oil-immersed transformer proposed by the present invention.

[0029] In the figure: 1. oil tank; 2. cooling fins; 3. oil pillow; 4. oil inlet pipe; 5. foot; 6. air bag; 7. upper support plate; 8. lower connecting rod; 9. cleaning rack; 10. scraper; 11. upper connecting rod; 12. support rod; 13. track; 14. lower moving block; 15. connecting pipe; 16. pressure valve; 17. exhaust valve; 18. spiral air pipe; 19. lower micro switch; 20. upper moving block; 21. upper micro switch; 22. lower support plate; 23. synchronization rod; 24. linear bearing; 25. dredging rod; 26. oil drain pipe; 27. winding; 28. oil mixing rod; 29. ​​three-way pipe; 30. plug rod; 31. spring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] Example:

[0033] Reference Figure 1-Figure 8 An oil-immersed transformer comprises an oil tank 1 and feet 5 connected to the four corners of the bottom of the oil tank 1, a winding 27 is arranged in the oil tank 1, an outer side of the oil tank 1 is connected to an oil pillow 3 through an oil inlet pipe 4, and the outer wall of the oil tank 1 is provided with equidistant array heat dissipation fins 2, and one side of the bottom of the oil tank 1 is connected to an oil drain pipe 26;

[0034] It also includes a cleaning component for removing dust from the surface of the heat dissipation fins 2.

[0035] In this embodiment, an oil-immersed transformer with a heat dissipation fin 2 cleaning assembly is provided. During long-term use, dust or impurities on the surface of the heat dissipation fin 2 can be automatically cleaned, so that heat can be dissipated to the outside in time.

[0036] Specifically, the cleaning assembly includes an airbag 6, the two ends of which are respectively fixedly connected to an upper support plate 7 and a lower support plate 22, the upper support plate 7 and the lower support plate 22 are slidably connected to the oil tank 1, the upper support plate 7 and the lower support plate 22 are both connected to a cleaning frame 9, a scraper 10 is arranged in the cleaning frame 9, and the scraper 10 and the heat dissipation fin 2 are arranged in close contact.

[0037] In this embodiment, a group of air bags 6 are installed on the outside of the oil tank 1 to supply and exhaust air to the air bags 6, thereby driving the upper support plate 7 and the lower support plate 22 on the upper and lower sides thereof, thereby driving the cleaning frame 9 to vertically rise and fall on the surface of the heat dissipating fins 2. Since a scraper 10 is provided in the cleaning frame 9, the scraper 10 can remove dust and impurities on the surface of the heat dissipating fins 2 during the lifting process.

[0038] The top end of the airbag 6 is connected to the oil tank 1 through a connecting pipe 15 , a pressure valve 16 is connected in the connecting pipe 15 , a spiral air pipe 18 is connected between the connecting pipe 15 and the airbag 6 , and an exhaust valve 17 is connected at one end of the airbag 6 .

[0039] In this embodiment, no external air supply is required, and the airbag 6 and the oil tank 1 are directly connected. A pressure valve 16 is set in the connecting pipe 15. When the inside of the oil tank 1 is overheated, the transformer oil decomposes to generate gas that expands in the oil tank 1. In this embodiment, the internal pressure value of the transformer is 0.2-0.5MPa. When the pressure value exceeds this range, the pressure valve 16 opens to release the internal gas of the transformer and fills it into the airbag 6 through the connecting pipe 15. After the airbag 6 expands, it drives the upper connecting rod 11 and the lower connecting rod 8 respectively through the upper supporting plate 7 and the lower supporting plate 22, thereby driving the cleaning frame 9 and the scraper 10 on the upper and lower sides of the heat sink 2 to slide on the surface of the heat sink fin 2 to clean the heat sink fin 2.

[0040] It should be noted that since the connecting pipe 15 and the oil tank 1 are fixedly connected, the installation of the pressure valve 16 is guaranteed to be stable, but the upper support plate 7 needs to move vertically. Therefore, the upper support plate 7 and the connecting pipe 15 are connected by a spiral air pipe 18.

[0041] The cleaning frame 9 is a U-shaped plate structure, and notches are provided on both sides of the cleaning frame 9, and the scraper 10 is detachably installed in the notches.

[0042] Furthermore, since the cleaning mechanism needs to cover a certain area of ​​the heat dissipating fins 2, the cleaning frame 9 is configured as a through-type U-shaped plate structure in this embodiment, and the scraper 10 is installed in the notch formed by the through-type structure, and only two groups of scrapers 10 are provided on one side. Thus, not only the function of the cleaning component can be guaranteed, but also the negative impact of large-area coverage on the heat dissipation effect of the heat dissipating fins 2 can be avoided.

[0043] The cleaning rack 9 is symmetrically arranged on the upper and lower sides of the heat dissipation fin 2. The cleaning rack 9 and the upper support plate 7 on the side away from the airbag 6 are connected by an upper connecting rod 11, and the cleaning rack 9 and the lower support plate 22 on the side away from the airbag 6 are connected by a lower connecting rod 8. The upper connecting rod 11 and the lower connecting rod 8 are fixedly connected to other groups of cleaning racks 9 through support rods 12 respectively.

[0044] In this embodiment, considering that the number of installed heat sink fins 2 corresponds to the number of matching cleaning racks 9, an upper connecting rod 11 and a lower connecting rod 8 with support rods 12 are used to connect multiple groups of cleaning racks 9 to one side of the upper support plate 7 and the lower support plate 22, and the movement of the upper support plate 7 and the lower support plate 22 can simultaneously drive multiple groups of cleaning racks 9 to clean the heat sink fins 2.

[0045] A track 13 is fixedly installed on the outer wall of the oil tank 1, and an upper moving block 20 and a lower moving block 14 are slidably installed in the track 13, the upper support plate 7 is fixedly connected to the upper moving block 20, and the lower support plate 22 is fixedly connected to the lower moving block 14. An upper microswitch 21 and a lower microswitch 19 are respectively installed on the upper and lower sides of the outer wall of the oil tank 1 near the track 13, and the exhaust valve 17 is electrically connected to the lower microswitch 19 and the upper microswitch 21.

[0046] In this embodiment, in order to make the airbag 6 extend and slide smoothly during the process of filling or discharging gas, a track 13 is set on the outer wall of the oil tank 1, and the upper moving block 20 and the lower moving block 14 sliding in the track 13 respectively drive the upper support plate 7 and the lower support plate 22 to slide in the track 13, which not only ensures the smooth lifting and lowering of the cleaning frame 9, but also ensures the fitting structure of the scraper 10 and the heat dissipation fins 2, further improving the cleaning effect of the scraper 10 on the heat dissipation fins 2, thereby ensuring timely heat dissipation;

[0047] In addition, in this embodiment, a lower microswitch 19 and an upper microswitch 21 are provided at the upper and lower ends of the track 13. When the expansion stroke of the airbag 6 drives the lower moving block 14 and the upper moving block 20 to move to the position of pushing the lower microswitch 19 and the upper microswitch 21, the lower microswitch 19 and the upper microswitch 21 are touched at the same time, and the electrical signal controls the exhaust valve 17 to open. At the same time, after the transformer releases the air pressure for a certain period of time, the pressure valve 16 is closed, the airbag 6 starts to exhaust, and the compression spring 31 connected between the upper and lower groups of cleaning frames 9 is reset, so that the cleaning frame 9 drives the scraper 10 to reset, and the heat dissipation fins 2 can be cleaned again.

[0048] The oil-immersed transformer also includes a dredging component for preventing the oil inlet pipe 4 and the oil outlet pipe 26 from being blocked.

[0049] Specifically, a dredging rod 25 is slidably installed in the oil tank 1. The dredging rod 25 is integrally formed into a U-shaped rod structure by two groups of vertical rods and one group of horizontal rods. One group of the vertical rods is slidably connected to the top cover of the oil tank 1 and the bottom plate of the oil tank 1 through linear bearings 24, and the other group of the vertical rods is vertically arranged in the oil inlet pipe 4 and the oil drain pipe 26.

[0050] In this embodiment, inside the oil tank 1, clearing components are provided at the installation positions of the oil inlet pipe 4 and the oil drain pipe 26, respectively. The clearing components include a clearing rod 25 which is integrally formed by two groups of vertical rods and a group of horizontal rods and is arranged as a U-shaped rod structure. Among them, one group of vertical rods is slidingly connected to the top cover of the oil tank 1 and the bottom plate of the oil tank 1 respectively through linear bearings 24, and the other group of vertical rods are vertically arranged in the oil inlet pipe 4 and the oil drain pipe 26 respectively. During the vertical movement of the clearing rod 25, the oil inlet pipe 4 and the oil drain pipe 26 can be cleared to avoid pipeline blockage.

[0051] It should be noted that the linear bearing 24 is a sealed structure, and adopts an LMF round flange type, which can not only ensure the smooth vertical movement of the dredging rod 25, but also ensure the original sealing structure of the transformer.

[0052] At the same time, the diameter of the vertical rod vertically running through the oil inlet pipe 4 and the oil discharge pipe 26 is smaller than the inner diameter of the oil inlet pipe 4 and the oil discharge pipe 26, and the single-side gap between the two is maintained at 10-15mm, and here, preferably 12mm.

[0053] The upper connecting rod 11 and the lower connecting rod 8 are connected via a synchronous rod 23 and one set of vertical rods.

[0054] In this embodiment, considering that the anti-blocking treatment of the oil inlet pipe 4 and the oil discharge pipe 26 does not need to be carried out continuously for a long time, without adding driving components, the synchronization rod 23 is connected with the upper connecting rod 11 and the lower connecting rod 8, so that the dredging component and the cleaning component can move synchronously, simplifying the internal structure of the transformer as much as possible and reducing the manufacturing cost.

[0055] The oil tank 1 is provided with a mixing rod 28 that acts vertically on the oil. Grooves are symmetrically provided on both sides of the mixing rod 28. Insertion rods 30 are arranged in an equidistant array in the grooves. A three-way pipe 29 is connected to the surface of the dredging rod 25. One end of the mixing rod 28 and the three-way pipe 29 are fixedly connected by an elastic pin.

[0056] Since the oil in the oil-immersed transformer may become dirty due to various reasons during use, and the oil is almost static inside the transformer, resulting in a temperature difference between the upper oil temperature and the lower oil temperature, the temperature distribution inside the transformer is uneven, and it will still affect the heat dissipation effect of the entire transformer. Therefore, in this embodiment, an oil mixing rod 28 is provided in the oil tank 1, and the dredging rod 25 and the oil mixing rod 28 are connected by using a three-way pipe 29 provided on the surface of the dredging rod 25. During the vertical lifting process of the dredging rod 25, the oil mixing rod 28 is driven to act in the oil at the same time, and the upper oil and the lower oil are mixed to a certain extent, so as to make the heat distribution in the oil tank 1 as uniform as possible, and finally dissipate it to the outside in time through the heat dissipation fins 2. The use of the oil mixing rod 28 can further promote heat dissipation.

[0057] It should be noted that the insertion rod 30 is added to the surface of the mixing rod 28, which effectively increases the contact area between the mixing rod 28 and the oil, and improves the mixing effect of the mixing rod 28 on the oil.

[0058] In the present invention, a group of connecting pipes 15 with a pressure valve 16 are provided to connect the oil tank 1 and the airbag 6. After the transformer has been used for a period of time, the internal air pressure of the transformer exceeds the pressure range, the pressure valve 16 is opened, and the gas is filled into the airbag 6. After the airbag 6 expands, it drives the upper support plate 7 and the lower support plate 22 to slide along the track 13 to the upper and lower sides respectively, thereby driving the cleaning frame 9 and the scraper 10 in the cleaning frame 9 to move along the surface of the heat dissipation fin 2 to clean the dust and impurities attached to the surface of the heat dissipation fin 2;

[0059] Since the upper support plate 7 and the lower support plate 22 are connected to the cleaning frame 9 by the upper connecting rod 11 and the lower connecting rod 8 respectively, and the upper connecting rod 11 and the lower connecting rod 8 are connected to the dredging rod 25 by the synchronous rod 23, the dredging rod 25 can move vertically in the oil inlet pipe 4 and the oil drain pipe 26 while cleaning the heat dissipating fins 2, thereby dredging the oil inlet pipe 4 and the oil drain pipe 26;

[0060] Based on the above, an oil mixing rod 28 is connected to the horizontal rod of the dredging rod 25 through a three-way pipe 29. The oil mixing rod 28 follows the movement of the dredging rod 25 to mix the upper oil and the lower oil to a certain extent, so as to make the heat distribution in the oil tank 1 as even as possible, and finally dissipate it to the outside in time through the heat dissipation fins 2. The use of the oil mixing rod 28 can further improve the heat dissipation effect.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An oil-immersed transformer, comprising an oil tank (1) and feet (5) connected to the four corners of the bottom of the oil tank (1), a winding (27) is arranged in the oil tank (1), an outer side of the oil tank (1) is connected to an oil pillow (3) through an oil inlet pipe (4), and the outer wall of the oil tank (1) is provided with equidistant arrays of heat dissipation fins (2), and one side of the bottom of the oil tank (1) is connected to an oil drain pipe (26), characterized in that: Also includes: A cleaning component for removing dust from the surface of the heat dissipation fins (2); A dredging component for preventing the oil inlet pipe (4) and the oil outlet pipe (26) from being blocked, wherein the dredging component and the cleaning component act synchronously; The cleaning assembly comprises an airbag (6), the two ends of the airbag (6) are respectively fixedly connected with an upper support plate (7) and a lower support plate (22), the upper support plate (7) and the lower support plate (22) are slidably connected to the oil tank (1), the upper support plate (7) and the lower support plate (22) are both connected with a cleaning frame (9), a scraper (10) is arranged inside the cleaning frame (9), the scraper (10) and the heat dissipation fin (2) are arranged in close contact, and a compression spring (31) is connected between the upper and lower groups of the cleaning frames (9) of the airbag (6); The cleaning frame (9) is symmetrically arranged on the upper and lower sides of the heat dissipation fins (2); the cleaning frame (9) on the side away from the airbag (6) and the upper support plate (7) are connected via an upper connecting rod (11); the cleaning frame (9) on the side away from the airbag (6) and the lower support plate (22) are connected via a lower connecting rod (8); the upper connecting rod (11) and the lower connecting rod (8) are respectively fixedly connected to other groups of cleaning frames (9) via supporting rods (12); A dredging rod (25) is slidably installed in the oil tank (1), and the dredging rod (25) is formed into a U-shaped rod structure by two groups of vertical rods and one group of horizontal rods. One group of the vertical rods is slidably connected to the top cover of the oil tank (1) and the bottom plate of the oil tank (1) through linear bearings (24), and the other group of the vertical rods is vertically arranged in the oil inlet pipe (4) and the oil outlet pipe (26). The upper connecting rod (11) and the lower connecting rod (8) are connected via a synchronous rod (23) and one set of vertical rods; The oil tank (1) is provided with an oil mixing rod (28) which acts vertically on the oil liquid, and grooves are symmetrically provided on both sides of the oil mixing rod (28), and rods (30) are arranged in an equidistant array in the grooves; The surface of the dredging rod (25) is connected with a three-way pipe (29), and one end of the oil mixing rod (28) and the three-way pipe (29) are fixedly connected by an elastic pin.

2. The oil-immersed transformer according to claim 1, characterized in that: The top end of the airbag (6) is connected to the oil tank (1) via a connecting pipe (15), a pressure valve (16) is connected inside the connecting pipe (15), a spiral air pipe (18) is connected between the connecting pipe (15) and the airbag (6), and one end of the airbag (6) is connected to an exhaust valve (17).

3. The oil-immersed transformer according to claim 1, characterized in that: The cleaning frame (9) is a U-shaped plate structure, and notches are provided on both sides of the cleaning frame (9), and the scraper (10) is detachably installed in the notches.

4. The oil-immersed transformer according to claim 2, characterized in that: A track (13) is fixedly mounted on the outer wall of the oil tank (1), an upper moving block (20) and a lower moving block (14) are slidably mounted in the track (13), the upper supporting plate (7) is fixedly connected to the upper moving block (20), the lower supporting plate (22) is fixedly connected to the lower moving block (14), an upper micro switch (21) and a lower micro switch (19) are respectively mounted on the upper and lower sides of the outer wall of the oil tank (1) near the track (13), and the exhaust valve (17) is electrically connected to the lower micro switch (19) and the upper micro switch (21).

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