Oil immersed transformer

Abstract

An oil immersed transformer comprises an oil tank, an oil conservator arranged above the oil tank, an air pressure balance system and a cooling system, the cooling system comprises a heat dissipation plate set, two positioning pipes, a first connecting pipe and a second connecting pipe, and the inner space of the oil conservator is communicated with inner channels of the two positioning pipes through the first connecting pipe and the second connecting pipe; the heat dissipation plate set comprises a first heat dissipation base, a second heat dissipation base, two guide rods and a plurality of sealing rings, the second heat dissipation base is arranged on the first heat dissipation base in a sliding mode, the guide rods are installed on the second heat dissipation base and inserted into the positioning pipes, and the sealing rings are installed on the guide rods and clamped between the guide rods and the positioning pipes. The guide rod can move on the positioning pipe for position adjustment, and during working, the air pressure balance system adjusts the state according to the height of the liquid level in the oil conservator, and then the air pressure in the oil conservator is used for adjusting the position of the second heat dissipation base. The service life of the transformer is effectively prolonged, practicability is high, and high popularization significance is achieved.

Description

Technical Field

[0001] The present invention relates to a transformer, in particular to an oil-immersed transformer. Background Art

[0002] Transformers are commonly used in power systems, primarily for voltage conversion, power distribution, and transmission. Oil-immersed transformers are a type of transformer. These are liquid-cooled transformers whose windings and core are completely immersed in insulating oil (usually mineral oil or synthetic ester). The oil's high insulation and heat dissipation properties ensure stable operation. Oil-immersed transformers dominate power systems due to their high capacity, low cost, and high reliability.

[0003] Oil-immersed transformers, especially small, self-cooled oil-immersed transformers, typically feature corrugated fins on the outside of the oil tank to aid heat dissipation. These fins effectively increase the surface area of ​​the fin in contact with the air, improving heat dissipation. However, the existing fins of self-cooled oil-immersed transformers have a fixed structure, and the heat dissipation area cannot be adjusted based on the transformer's operating power. Because the fins primarily dissipate heat in self-cooled transformers, high-load operation can generate significant heat, which can lead to inadequate heat dissipation from the fins. This can cause the transformer to overheat, damage components, and reduce its service life. Summary of the Invention

[0004] Based on this, it is necessary to provide an oil-immersed transformer to address the deficiencies in the prior art.

[0005] An oil-immersed transformer includes an oil tank, an oil pillow arranged above the oil tank, an air pressure balance system and a cooling system, wherein the cooling system includes a heat sink group, two positioning tubes, a first connecting tube, and a second connecting tube, wherein the inner space of the oil pillow and the inner channels of the two positioning tubes are connected through the first connecting tube and the second connecting tube; the heat sink group includes a first heat sink, a second heat sink, two guide rods, and a plurality of sealing rings, wherein the second heat sink is slidably arranged on the first heat sink, the guide rod is mounted on the second heat sink and inserted into the positioning tube, the sealing ring is mounted on the guide rod and clamped between the guide rod and the positioning tube, and the guide rod can be moved and adjusted on the positioning tube. During operation, the air pressure balance system adjusts its state according to the liquid level in the oil pillow, and then uses the air pressure in the oil pillow to adjust the second heat sink.

[0006] In one embodiment, the air pressure balancing system includes an oil guide pipe and an electric control valve, wherein both ends of the oil guide pipe are connected to the oil pillow and the oil tank respectively, and the electric control valve is connected to the oil pillow through a pipe;

[0007] When the temperature of the insulating oil rises to the point where the liquid level reaches the set value, the switch of the electric control valve is closed. When the air pressure inside the oil pillow increases further, the air pressure inside the oil pillow pushes the guide rod and the second heat sink to move outward. When the air pressure inside the oil pillow reaches the set value, the switch of the electric control valve is reopened.

[0008] When the insulating oil level inside the oil pillow drops to the set value, the switch of the electric control valve is closed. When the temperature of the insulating oil continues to drop, the air pressure inside the oil pillow forms a negative pressure, pulling the guide rod and the second heat sink back to their positions. When it is detected that the air pressure inside the oil pillow drops to the set value, the switch of the electric control valve is reopened.

[0009] In one embodiment, the air pressure balancing system also includes a control box, a pressure gauge, and a liquid level gauge. The pressure gauge and the liquid level gauge are installed near the top of the oil pillow. The pressure gauge is used to detect the air pressure inside the oil pillow, and the liquid level gauge is used to detect the liquid level of the insulating oil inside the oil pillow. The pressure gauge, the liquid level gauge and the electronically controlled valve are all electrically connected to the control box. The pressure gauge and the liquid level gauge feed back the detection results to the control box, and the control box controls the operation of the electronically controlled valve.

[0010] In one embodiment, there are two heat dissipation plate groups, and the guide rods of the two heat dissipation plate groups are respectively inserted into the positioning tube from the front and rear sides of the positioning tube.

[0011] In one embodiment, the number of the heat dissipation plate group is one group, and one end of the positioning tube away from the heat dissipation plate group is in a closed state.

[0012] In one embodiment, the oil tank includes a tank body and a tank cover arranged on the upper end surface of the tank body. The front and rear opposite sides of the tank body in the horizontal direction are wide sides with relatively large areas, and the left and right opposite sides of the tank body are narrow sides with relatively small areas. The first heat sink is fixedly installed on the wide side of the tank body, and the two positioning tubes are respectively arranged on the outside of the two narrow sides of the tank body.

[0013] In one embodiment, the first heat sink includes a first main body plate and a plurality of first heat sinks connected to one side of the first main body plate; the second heat sink includes a second main body plate and a plurality of second heat sinks connected to one side of the second main body plate, and the second heat sink is further provided with a plurality of receiving grooves, the receiving grooves corresponding one-to-one to the second heat sinks, and the receiving grooves extend inward to the interior of the second heat sink, the first heat sink corresponds one-to-one to the receiving grooves on the second heat sink, and the first heat sink is snapped into the receiving grooves.

[0014] In one embodiment, the second heat sink is further provided with hollow holes on the second main body plate, and the hollow holes are distributed between the two second heat sinks.

[0015] In one embodiment, the outer surface of the guide rod is provided with a plurality of grooves, the sealing ring is installed on the grooves of the guide rod and extends from the notch of the grooves, and the sealing ring is clamped between the grooves of the guide rod and the inner wall of the positioning tube.

[0016] In one embodiment, the heat sink group further includes a plurality of limiting members, which pass through the second heat sink and are installed on the box body. The limiting members guide and limit the second heat sink so that the second heat sink can be adjusted along the first heat sink within a certain distance in the horizontal direction.

[0017] The beneficial effects of the oil-immersed transformer of the present invention are as follows: on the basis of the first heat sink, a second heat sink is further provided, and the position of the second heat sink on the first heat sink is adjustable to change the heat dissipation area. The air pressure balance system adjusts its state according to the liquid level in the oil pillow, and then uses the air pressure in the oil pillow to adjust the position of the second heat sink. When the transformer is in a high-load state, the heat sink group increases the heat dissipation area, enhances the cooling capacity, and prevents the oil temperature from being too high. When the transformer is in a low-load state, the heat dissipation area is reduced, unnecessary heat dissipation losses are reduced, the operating economy is improved, and the insulating oil is prevented from being overcooled or overheated. The transformer of the present invention is particularly suitable for operating environments with significant load fluctuations, large temperature differences between day and night, and significant seasonal temperature differences. It effectively extends the life of the transformer, has strong practicality, and has strong promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 、 Figure 2 Schematic diagrams of the structure of the oil-immersed transformer of the present invention at different angles;

[0019] Figure 3 、 Figure 4 Schematic diagram of the connection of the oil pillow, air pressure balance system, and cooling system at different angles in the present invention;

[0020] Figure 5 This is a cross-sectional view of the positioning tube and the guide rod of the present invention when they are assembled together, wherein the air pressure is in a state of driving the guide rod to return to its original position;

[0021] Figure 6 This is a cross-sectional view of the positioning tube and the guide rod of the present invention when they are assembled together, wherein the air pressure is in a state of driving the guide rod to shift outward.

[0022] Figure 7 A schematic structural diagram of the first heat sink and the second heat sink in the present invention;

[0023] Figure 8 for Figure 7 Enlarged view of the middle circled portion A. DETAILED DESCRIPTION

[0024] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0030] See also Figures 1 to 8 The present invention provides an oil-immersed transformer, comprising an oil tank 10, an iron core (not shown) arranged in the oil tank 10, a primary winding (not shown) and a secondary winding (not shown) wound on the iron core, a support frame 40 and a bushing 30 mounted on the oil tank 10, an oil pillow 20 mounted on the support frame 40 and arranged above the oil tank 10, insulating oil filled in the oil tank 10 and the oil pillow 20, an air pressure balance system 60 connected to the oil tank 10, and a cooling system 50 for assisting in cooling the insulating oil in the oil tank 10. The primary winding and the secondary winding are drawn out from the bushing 30, and the insulating oil fills the entire interior of the oil tank 10 from the oil pillow 20 through the air pressure balance system 60. The air pressure balance system 60 controls the air pressure in the oil pillow 20, thereby adjusting the state of the cooling system 50.

[0031] The oil tank 10 includes a body 11 and a cover 12 mounted on the upper end of the body 11. The body 11 and cover 12 together form a sealed space for storing the iron core and insulating oil. The body 11 is generally square in shape, with relatively large wide surfaces 111 on the horizontally opposite front and rear sides of the body 11, and relatively small narrow surfaces 112 on the horizontally opposite left and right sides of the body 11. The support frame 40 and sleeve 30 are mounted on the cover 12. The oil pillow 20 is provided with an oil filling port 21 and a sealing plug (not shown), which seals the oil filling port 21.

[0032] The cooling system 50 includes at least one group of heat sink groups 51, two positioning tubes 52, a first connecting tube 53, and a second connecting tube 54. The positioning tubes 52, the first connecting tube 53, and the second connecting tube 54 are all arranged in a hollow tubular structure. The two positioning tubes 52 are respectively arranged on the outside of the two narrow surfaces 112 on the box body 11, and the positioning tubes 52 are distributed along the front and rear directions. The cooling system 50 also includes a fixing frame 55 for fixing the positioning tubes 52. The fixing frame 55 is installed and fixed on the narrow surface 112 of the box body 11. One end of the first connecting tube 53 is connected to the top position of the oil pillow 20, and the other end of the first connecting tube 53 is connected to one of the positioning tubes 52. The two ends of the second connecting tube 54 are respectively connected to the first connecting tube 53 and the other positioning tube 52. The inner space of the oil pillow 20 and the inner channels of the two positioning tubes 52 are connected through the first connecting tube 53 and the second connecting tube 54.

[0033] Each heat sink assembly 51 includes a first heat sink 511, a second heat sink 512, two guide rods 513, a plurality of sealing rings 514, and a plurality of position limiting members 515. The second heat sink 512 is slidably mounted on the first heat sink 511. The guide rods 513 are mounted on the second heat sink 512 and inserted into the positioning tube 52. The sealing ring 514 is mounted on the guide rods 513 and clamped between the guide rods 513 and the positioning tube 52. The sealing ring 514 seals the air path between the inside and outside of the positioning tube 52 and enables The guide rod 513 can be moved and adjusted on the positioning tube 52. The limiting member 515 passes through the second heat sink 512 and is installed on the box body 11. When the guide rod 513 is squeezed in the positioning tube 52, the second heat sink 512 is adjusted outward to increase the heat dissipation area of ​​the heat sink group 51. The limiting member 515 guides and limits the second heat sink 512 so that the second heat sink 512 can be adjusted along the first heat sink 511 within a certain distance in the horizontal direction to prevent the second heat sink 512 from falling off the first heat sink 511.

[0034] Specifically, the first heat sink 511 includes a first main plate 5111 and a plurality of first heat sinks 5112 connected to one side of the first main plate 5111. The first heat sinks 5112 are arranged side by side. The second heat sink 512 includes a second main plate 5121 and a plurality of second heat sinks 5122 connected to one side of the second main plate 5121. The second heat sinks 5122 are arranged side by side. The second heat sink 512 is also provided with a plurality of receiving grooves 5123. The receiving grooves 5123 correspond one-to-one with the second heat sinks 5122. The receiving grooves 5123 extend inward from the side of the second main plate 5121 facing away from the second heat sinks 5122 to the interior of the second heat sinks 5122.

[0035] The outer surface of the guide rod 513 is provided with a plurality of slots 5131 . The two guide rods 513 on the heat dissipation plate group 51 are respectively installed on the second main plate 5121 at two sides facing away from the second heat dissipation fin 5122 . One end of the limiter 515 is provided with a limit head 5151 .

[0036] During assembly, the sealing ring 514 is installed on the card slot 5131 of the guide rod 513 and extends from the notch of the card slot 5131. The first heat sink 511 is fixedly installed on the wide surface 111 of the box body 11. The two guide rods 513 on the heat sink group 51 are respectively inserted into the two positioning tubes 52. The sealing ring 514 is clamped between the card slot 5131 of the guide rod 513 and the inner wall of the positioning tube 52. The first heat sink 5111 corresponds one-to-one to the accommodating groove 5123 on the second heat sink 512. The first heat sink 5111 is inserted into the accommodating groove 5123. The end of the positioning member away from the limit head 5151 passes through the second main plate 5121 and is fixed to the box body 11.

[0037] In addition, the second heat sink 512 is further provided with a hollow hole 5124 on the second main body plate 5121. The hollow hole 5124 is distributed between the two second heat sinks 5122. By providing the hollow hole 5124, the weight of the second heat sink 512 can be reduced, making the second heat sink 512 easier to push. At the same time, when the second heat sink 512 is completely buckled on the first heat sink 511 or opened outward, the heat dissipation effect of the first heat sink 511 is guaranteed.

[0038] In this embodiment, there are two heat sink groups 51, and the guide rods 513 of the two heat sink groups 51 are respectively inserted into the positioning tube 52 from the front and rear sides thereof. In other embodiments, for low-power transformers, the heat sink group 51 may also be provided as a single group. When there is only one heat sink group 51, the end of the positioning tube 52 away from the heat sink group 51 is in a closed state.

[0039] The air pressure balance system 60 includes an oil guide pipe 61, a pressure gauge 62, a liquid level gauge 63, an emergency pressure relief valve 64, a respirator 66, an electrically controlled valve 65, a first guide pipe 67, a second guide pipe 68 and a control box. The two ends of the oil guide pipe 61 are respectively connected to the bottom of the oil pillow 20 and the top of the oil tank 10. The oil guide pipe 61 connects the sealed space inside the oil tank 10 and the inner space of the oil pillow 20. The pressure gauge 62 and the liquid level gauge 63 are installed near the top of the oil pillow 20. The pressure gauge 62 is used to detect the air pressure inside the oil pillow 20. The liquid level gauge 63 is used to detect the liquid level of the insulating oil inside the oil pillow 20. The emergency pressure relief valve 64 is installed at the bottom of the oil pillow 20. When the emergency pressure relief valve 64 is opened, the emergency pressure relief valve 64 can perform emergency pressure relief on the insulating oil inside the oil pillow 20. One port of the electric control valve 65 is connected to the top of the oil pillow 20 through a first guide pipe 67, and the other port of the electric control valve 65 is connected to the breather 66 through a second guide pipe 68. After the switch of the electric control valve 65 is turned on, the breather 66 is connected to the internal space of the oil pillow 20.

[0040] In addition, the pressure gauge 62, liquid level gauge 63, emergency pressure relief valve 64, and electronically controlled valve 65 are all electrically connected to the control box. The pressure gauge 62 and liquid level gauge 63 feed their detection results back to the control box, which controls the operation of the emergency pressure relief valve 64 and electronically controlled valve 65. The respirator 66 is equipped with a desiccant to absorb moisture and impurities, preventing moisture and impurities in the air from coming into contact with the insulating oil and causing deterioration of the insulating oil.

[0041] The working process of the oil-immersed transformer of the present invention is described in detail below:

[0042] The oil tank 10 is replenished through the oil filling port 21 of the oil pillow 20 and the oil guide pipe 61 until the insulating oil fills the interior of the oil tank 10 and the insulating oil level in the oil pillow 20 reaches approximately 1 / 2. The oil filling port 21 is sealed with a sealing plug. Initially, the switch of the electronically controlled valve 65 is in the open state, the second heat sink 512 is completely attached to the first heat sink 511, the liquid level gauge 63 detects the insulating oil level, and the pressure gauge 62 detects the air pressure inside the oil pillow 20. During transformer operation, heat is generated, causing the insulating oil to expand. The insulating oil in the oil tank 10 is reversely injected into the oil pillow 20, causing the insulating oil level in the oil pillow 20 to rise.

[0043] When the temperature of the insulating oil rises to a level that reaches the set value, the control box closes the switch of the electronically controlled valve 65. As the temperature of the insulating oil continues to rise, the air pressure inside the oil pillow 20 increases. The air pressure acts on the guide rod 513 through the internal passages of the first connecting tube 53, the second connecting tube 54, and the positioning tube 52, thereby pushing the guide rod 513 and the second heat sink 512 outward, exposing a larger area of ​​the second heat sink 512 and the first heat sink 511 to the air and improving the heat dissipation effect. When the second heat sink 512 moves to the position limited by the limit head 5151 of the limiter 515, the air pressure inside the pillow cannot be released, and the air pressure inside the pillow increases. When the pressure gauge 62 detects that the air pressure inside the oil pillow 20 has reached the set value, the control box reopens the switch of the electronically controlled valve 65 to release the air pressure.

[0044] When the insulating oil level inside the oil pillow 20 rises to the warning value, the control box opens the emergency pressure relief valve 64, allowing the insulating oil inside the oil pillow 20 to flow out from the emergency pressure relief valve 64 for emergency pressure relief.

[0045] When the second heat sink 512 is in an outwardly open state and the temperature of the insulating oil begins to drop, and the insulating oil level inside the oil pillow 20 drops to a set value, the control box closes the switch of the electric control valve 65. When the temperature of the insulating oil continues to drop, the air pressure inside the oil pillow 20 forms a negative pressure. Under the action of the negative pressure inside the oil pillow 20, the guide rod 513 and the second heat sink 512 are pulled back to their original positions, so that the second heat sink 512 is completely buckled on the first heat sink 511. When the air pressure inside the pillow further decreases, the pressure gauge 62 detects that the air pressure inside the oil pillow 20 drops to a set value, and the control box reopens the switch of the electric control valve 65 to maintain the air pressure balance inside and outside the oil tank 10.

[0046] The beneficial effects of the oil-immersed transformer of the present invention are as follows: on the basis of the first heat sink 511, a second heat sink 512 is further provided, and the position of the second heat sink 512 on the first heat sink 511 is adjustable to change the heat dissipation area, and the air pressure balance system 60 adjusts the state according to the liquid level in the oil pillow 20, and then uses the air pressure in the oil pillow 20 to adjust the position of the second heat sink 512. When the transformer is in a high-load state, the heat sink group 51 increases the heat dissipation area, enhances the cooling capacity, and prevents the oil temperature from being too high. When the transformer is in a low-load state, the heat dissipation area is reduced, unnecessary heat dissipation losses are reduced, the operating economy is improved, and the insulating oil is prevented from being overcooled or overheated. The transformer of the present invention is particularly suitable for operating environments with significant load fluctuations, large temperature differences between day and night, and significant seasonal temperature changes. It effectively extends the life of the transformer, is highly practical, and has a strong promotion significance.

[0047] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An oil-immersed transformer, comprising an oil tank, an oil pillow arranged above the oil tank, an air pressure balancing system and a cooling system, characterized in that: The cooling system includes a heat sink group, two positioning tubes, a first connecting tube, and a second connecting tube. The inner space of the oil pillow and the inner channels of the two positioning tubes are connected through the first connecting tube and the second connecting tube; the heat sink group includes a first heat sink, a second heat sink, two guide rods, and several sealing rings. The second heat sink is slidably arranged on the first heat sink, the guide rod is installed on the second heat sink and inserted into the positioning tube, the sealing ring is installed on the guide rod and clamped between the guide rod and the positioning tube, and the guide rod can be moved and adjusted on the positioning tube. During operation, the air pressure balance system adjusts its state according to the liquid level height in the oil pillow, and then uses the air pressure in the oil pillow to adjust the second heat sink.

2. The oil-immersed transformer according to claim 1, characterized in that: The air pressure balance system includes an oil guide pipe and an electric control valve. The two ends of the oil guide pipe are respectively connected to the oil pillow and the oil tank. The electric control valve is connected to the oil pillow through a pipe. When the temperature of the insulating oil rises to the point where the liquid level reaches the set value, the switch of the electric control valve is closed. When the air pressure inside the oil pillow increases further, the air pressure inside the oil pillow pushes the guide rod and the second heat sink to move outward. When the air pressure inside the oil pillow reaches the set value, the switch of the electric control valve is reopened. When the insulating oil level inside the oil pillow drops to the set value, the switch of the electric control valve is closed. When the temperature of the insulating oil continues to drop, the air pressure inside the oil pillow forms a negative pressure, pulling the guide rod and the second heat sink back to their positions. When it is detected that the air pressure inside the oil pillow drops to the set value, the switch of the electric control valve is reopened.

3. The oil-immersed transformer according to claim 2, characterized in that: The air pressure balance system also includes a control box, a pressure gauge, and a liquid level gauge. The pressure gauge and the liquid level gauge are installed near the top of the oil pillow. The pressure gauge is used to detect the air pressure inside the oil pillow, and the liquid level gauge is used to detect the liquid level of the insulating oil inside the oil pillow. The pressure gauge, the liquid level gauge and the electronically controlled valve are all electrically connected to the control box. The pressure gauge and the liquid level gauge feed back the detection results to the control box, and the control box controls the operation of the electronically controlled valve.

4. The oil-immersed transformer according to claim 1, characterized in that: There are two heat dissipation plate groups, and the guide rods of the two heat dissipation plate groups are respectively inserted into the positioning tube from the front and rear sides of the positioning tube.

5. The oil-immersed transformer according to claim 1, characterized in that: The number of the heat dissipation plate group is one group, and one end of the positioning tube away from the heat dissipation plate group is in a closed state.

6. The oil-immersed transformer according to claim 1, characterized in that: The oil tank includes a tank body and a tank cover arranged on the upper end surface of the tank body. The front and rear opposite sides of the tank body in the horizontal direction are wide sides with relatively large areas, and the left and right opposite sides of the tank body are narrow sides with relatively small areas. The first heat sink is fixedly installed on the wide side of the tank body, and the two positioning tubes are respectively arranged on the outside of the two narrow sides of the tank body.

7. The oil-immersed transformer according to claim 1, characterized in that: The first heat sink includes a first main body plate and a plurality of first heat sinks connected to one side of the first main body plate; the second heat sink includes a second main body plate and a plurality of second heat sinks connected to one side of the second main body plate. The second heat sink is also provided with a plurality of receiving grooves, which correspond one-to-one to the second heat sinks. The receiving grooves extend inwardly to the interior of the second heat sink. The first heat sink corresponds one-to-one to the receiving grooves on the second heat sink, and the first heat sink is snapped into the receiving grooves.

8. The oil-immersed transformer according to claim 7, characterized in that: The second heat sink is further provided with hollow holes on the second main body plate, and the hollow holes are distributed between the two second heat sinks.

9. The oil-immersed transformer according to claim 1, characterized in that: The outer peripheral surface of the guide rod is provided with a plurality of grooves, the sealing ring is installed on the grooves of the guide rod and extends from the notch of the grooves, and the sealing ring is clamped between the grooves of the guide rod and the inner wall of the positioning tube.

10. The oil-immersed transformer according to claim 1, characterized in that: The heat sink assembly further comprises a plurality of limiting members, which pass through the second heat sink and are mounted on the box body. The limiting members guide and limit the second heat sink so that the second heat sink can be adjusted along the first heat sink within a certain distance in the horizontal direction.

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