An oil-immersed high-voltage transformer

Abstract

The present invention relates to the technical field of heat dissipation of transformers, and more specifically, to an oil-immersed high-voltage transformer. The transformer comprises a protective body, an oil container disposed within the protective body, the oil container being filled with insulating oil, a transformer coil disposed within the oil container, the transformer coil being submerged by the insulating oil, and an oil collecting tank disposed below the oil container. The present invention disposes the oil collecting tank below the oil container, and disposes both the oil container and the oil collecting tank within the protective body, so that the oil collecting tank does not occupy space above the oil container. The oil container and the oil collecting tank are connected together by a plurality of telescopic tubes, so that insulating oil can circulate between the oil container and the oil collecting tank, thereby avoiding the need for a spiral pipe for heat dissipation. A gap is left between the oil container and the oil collecting tank, so that outside air can dissipate heat from the oil container and the oil collecting tank through the gap between the oil container and the oil collecting tank.

Description

Technical Field

[0001] The present invention relates to the technical field of mutual inductor heat dissipation, in particular to an oil-immersed high-voltage mutual inductor. Background Art

[0002] An oil-immersed current transformer is a device that measures and detects current through current induction. The main working principle of an oil-immersed current transformer is to surround the current to be measured with a winding. The current in the winding is proportional to the current to be measured. When the current to be measured passes through the winding, the magnetic field generated will cause an electromotive force in the winding, and then the magnitude of the electromotive force is measured to determine the strength of the current. The insulating oil can absorb the heat generated when the transformer is working, and then the heat is dissipated outward through the insulating oil to achieve heat dissipation of the transformer.

[0003] Normally, the insulating oil inside the transformer is in a static state. In this state, the insulating oil has a poor effect in absorbing the heat of the transformer and the heat diffusion rate is slow. In order to speed up the diffusion of the transformer's heat, an oil tank is installed above the transformer, and then the oil tank and the transformer are connected through an oil pump so that the insulating oil can flow inside the transformer, thereby speeding up the diffusion of the transformer's heat.

[0004] However, with the above method, the oil tank installed above the transformer will occupy the space above the transformer. At the same time, during the circulation of the oil in the oil tank, especially in large transformers, when the insulating oil flows, it is easy for a dead zone of oil flow to appear inside the transformer, which in turn leads to local heat accumulation. At the same time, in order to accelerate the heat dissipation of the insulating oil, the oil channel will be spirally arranged to improve the heat dissipation effect of the insulating oil. However, the oil channel in the process not only occupies part of the space, but also expands the area of ​​the oil channel, making the oil channel more likely to contact with external substances and easily damaged. Therefore, a device is needed that can solve the dead zone of oil flow in the transformer and accelerate the heat dissipation of the internal temperature of the transformer. Summary of the Invention

[0005] The object of the present invention is to provide an oil-immersed high-voltage transformer to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, an oil-immersed high-voltage transformer is provided, comprising a protective body, an oil reservoir disposed within the protective body, the oil reservoir being filled with insulating oil, a transformer coil disposed within the oil reservoir, the transformer coil being submerged in the insulating oil, an oil collection tank disposed below the oil reservoir, a plurality of telescopic tubes disposed between the oil reservoir and the oil collection tank, an oil pump mounted on one side of the oil collection tank, a liquid inlet of the oil pump being connected to the interior of the oil collection tank via a pipeline, and a liquid outlet of the oil pump delivering insulating oil to the bottom and top of the interior of the oil reservoir via two pipelines;

[0007] When the temperature of the insulating oil inside the oil container rises, the insulating oil in the oil container flows into the oil collecting tank through the telescopic tube. The oil pump transports the insulating oil in the oil collecting tank to the oil container. The insulating oil flows from the middle position to both sides of the oil container in the order of top to bottom and then from bottom to top.

[0008] The oil collecting box moves up and down on the lower side of the oil container to adjust the size of the gap between the oil container and the oil collecting box. The external air flow enters between the oil container and the oil collecting box through the side of the protective body and flows downward from the middle of the oil collecting box.

[0009] As a further improvement of the present technical solution, the oil container includes an oil containing shell, which is shaped like an inverted prism with an opening on the top. The insulating oil and the transformer coil are both arranged inside the oil containing shell, and a top cover is fixedly installed on the top of the oil containing shell to cover the top of the oil containing shell.

[0010] As a further improvement of the present technical solution, a conical bottom trough is provided on the bottom side wall inside the oil holding shell, and a connecting pipe is connected to the bottom of the conical bottom trough. One of the pipes at the liquid outlet end of the oil pump is connected to the connecting pipe, and the other pipe is connected to a position near the top middle of one side of the oil holding shell, wherein the diameter of the pipe connected to the connecting pipe is smaller than the diameter of the pipe near the top of the oil holding shell, and a conical plate is installed inside the conical bottom trough, which guides the liquid entering the oil holding shell from the connecting pipe to the four sides of the oil holding shell.

[0011] As a further improvement of the present technical solution, a number of arc-shaped protrusions are fixed on opposite sides of the oil-containing shell near the top, and an arc-shaped double-layer metal plate is installed on the arc-shaped protrusion. The double-layer metal plate is composed of two metals. When the insulating oil heats up, one end of the double-layer metal plate is bent away from the arc-shaped protrusion. Oil outlet pipes are fixed at positions corresponding to the positions of the arc-shaped protrusions on the outside of the oil-containing shell. A flow groove connected to the oil outlet pipe is opened on the arc-shaped protrusion at a position away from the connection with the double-layer metal plate. The double-layer metal plate blocks the flow groove at room temperature.

[0012] As a further improvement of the present technical solution, a heat sink is installed near the bottom of the oil-containing shell, a partition basin is installed inside the heat sink, the transformer coil is arranged in the partition basin, and the bottom of the partition basin is arranged on the upper side of the conical plate. Several through openings are opened at the bottom of the partition basin, and the insulating oil in the partition basin moves to the lower side of the partition basin through the through openings.

[0013] As a further improvement of the present technical solution, two of the side walls of the separation basin are tightly fitted with the side walls of the oil-containing shell, and a separation plate is fixed to the top of the other two side walls of the separation basin. The other end of the separation plate extends to the upper side of the arc-shaped protrusion and is fixed on the oil-containing shell. The separation basin and the two separation plates divide the interior of the oil-containing shell into two upper and lower spaces.

[0014] As a further improvement of the present technical solution, the oil collection tank includes an oil tank shell, which is U-shaped. The oil tank shell is arranged directly below the oil holding outer shell, and the bottom of the oil holding outer shell is arranged inside the oil tank shell. Several oil inlet pipes corresponding to the positions of the oil outlet pipes are fixed at both ends of the oil tank shell. The oil inlet pipe and the oil outlet pipe are connected by a telescopic pipe, and the pipeline at the liquid inlet end of the oil pump passes through the side wall of the oil tank shell and is arranged at the inner bottom of the oil tank shell.

[0015] As a further improvement of the present technical solution, an air outlet is provided in the middle position of the upper side of the fuel tank shell, and an installation opening is provided in the middle position of the lower side of the fuel tank shell. A bottom sealing plate is installed in the installation opening, and an air duct is fixed on the bottom sealing plate. The other end of the air duct is tightly connected to the air outlet, and a fan is installed inside the air duct.

[0016] As a further improvement of the present technical solution, the protective body includes a protective shell, the oil container shell is fixedly installed at the top position of the protective shell, and air vents are opened in the upper parts of the opposite sides of the protective shell. The oil tank shell is arranged in the lower part of the protective shell, the telescopic tube is arranged at the position of the air vent, and a bottom opening is opened at the bottom of the protective shell, and the fan is arranged above the bottom opening.

[0017] As a further improvement of the present technical solution, a number of vertically arranged sliders are fixed on the side wall of the fuel tank shell, and a number of slideways corresponding to the positions of the sliders are fixed on the inner side wall of the protective shell. The sliders are slidably arranged inside the slideways. An electric push rod is hinged symmetrically on the left and right sides of the bottom of the fuel tank shell, and the other end of the electric push rod is hinged to the bottom of the protective shell. When the piston rod of the electric push rod is extended and retracted, it drives the fuel tank shell to move up and down inside the protective shell.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In this oil-immersed high-voltage transformer, the oil collecting tank is arranged below the oil container, and both the oil container and the oil collecting tank are arranged inside the protective body, so that the oil collecting tank does not occupy the space above the oil container. At the same time, the oil container and the oil collecting tank are connected together by a plurality of telescopic tubes, so that the insulating oil can circulate between the oil container and the oil collecting tank. In this way, the provision of a spiral pipe for heat dissipation is avoided. At the same time, a gap is left between the oil container and the oil collecting tank. The outside air can dissipate heat from the oil container and the oil collecting tank through the gap between the oil container and the oil collecting tank, further enhancing the heat dissipation effect of the device.

[0020] 2. In this oil-immersed high-voltage transformer, the interior of the oil-containing casing is divided into two parts by a partition basin and a partition plate. The insulating oil in the oil-containing casing flows downward in the middle of the oil-containing casing and then moves upward from the bottom of the oil-containing casing. In this way, the insulating oil in the oil-containing casing can form a flow path inside the oil-containing casing, thereby avoiding the formation of dead zones in the oil flow inside the oil-containing casing and preventing local heat accumulation in the oil-containing casing.

[0021] 3. In this oil-immersed high-voltage transformer, the oil pump divides the insulating oil in the oil collecting tank into two channels and transports it to the oil-containing shell. When the insulating oil in the oil container flows into the oil collecting tank, the insulating oil transported to the upper end of the oil containing shell will flow downward, so that the insulating oil newly entering the oil containing shell will contact the transformer coil, so that the insulating oil can better absorb the heat dissipated from the transformer coil. The insulating oil entering the oil containing shell from the connecting pipe is guided by the conical plate to the edge of the oil containing shell, and then moves upward and flows into the oil collecting tank through the circulation groove. In this way, the flow speed of the insulating oil in the oil containing shell is accelerated, and the heat dissipation effect of the insulating oil on the transformer coil is improved.

[0022] 4. In the oil-immersed high-voltage transformer, when the device is in normal use, the oil collecting box is moved downward away from the oil container to expand the gap between the oil container and the oil collecting box. At this time, the natural wind from the outside can enter between the oil container and the oil collecting box through the vent, so that the natural wind cools the oil container and the oil collecting box. At the same time, the fan can also actively form an airflow to flow between the oil container and the oil collecting box, thereby accelerating the heat dissipation rate of the oil container and the oil collecting box. At the same time, when the temperature of the insulating oil in the oil container rises, the oil collecting box is moved upward to reduce the size of the gap between the oil container and the oil collecting box, thereby accelerating the flow rate of the airflow between the oil container and the oil collecting box, and further accelerating the heat dissipation effect of the oil container and the oil collecting box.

[0023] 5. In the oil-immersed high-voltage transformer, during the normal use of the transformer coil, the double-layer metal plate will slightly warp. At this time, the insulating oil in the oil-containing shell is slowly transported to the oil collection tank. Then, when the insulating oil in the oil collection tank reaches the specified amount, the insulating oil is transported to the oil container through the oil pump. In this way, the insulating oil in the oil container can also flow during normal operation, thereby accelerating the uniform heating of the insulating oil in the oil container and achieving effective heat dissipation of the transformer coil by the insulating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention;

[0025] Figure 2 This is a schematic cross-sectional view of the overall device of Example 1 of the present invention operating at a high temperature;

[0026] Figure 3 This is a schematic cross-sectional view of the overall device of Example 1 of the present invention operating under normal conditions;

[0027] Figure 4 This is a schematic diagram of the internal structure of the overall device of Example 1 of the present invention;

[0028] Figure 5 Schematic diagram of the cross-sectional structure of the protective body of Example 1 of the present invention;

[0029] Figure 6 This is a structural schematic diagram of an oil container according to Example 1 of the present invention;

[0030] Figure 7 This is a schematic cross-sectional view of the oil container according to Example 1 of the present invention;

[0031] Figure 8 This is a partial cross-sectional structural diagram of an oil container according to Example 1 of the present invention;

[0032] Figure 9 This is a schematic diagram of the heat dissipation fin structure of Example 1 of the present invention;

[0033] Figure 10 This is a schematic diagram of the cross-sectional front view of the oil container according to Example 1 of the present invention;

[0034] Figure 11 This is a schematic diagram of the assembly structure of the partition basin and partition plate of Example 1 of the present invention;

[0035] Figure 12 This is a schematic structural diagram of an oil-collecting tank according to Example 1 of the present invention;

[0036] Figure 13 This is a schematic cross-sectional view of the oil-collecting tank according to Example 1 of the present invention;

[0037] Figure 14 This is a schematic diagram of the overall device of Example 1 of the present invention being cooled by natural wind during normal operation;

[0038] Figure 15 This is a schematic diagram of the overall device of Example 1 of the present invention being cooled by a fan during normal operation;

[0039] Figure 16 This is a schematic diagram of the overall device of Example 1 of the present invention assisting the fan in cooling down when working at high temperature.

[0040] The meaning of each number in the figure is:

[0041] 1. Protective body; 11. Protective shell; 12. Ventilation port; 13. Bottom port; 14. Slideway;

[0042] 2. Oil container; 21. Oil container housing; 211. Conical bottom trough; 212. Arc-shaped protrusion; 213. Flow trough; 22. Top cover; 23. Partition basin; 24. Radiating fin rack; 25. Partition plate; 26. Conical plate; 27. Oil outlet pipe; 28. Double-layer metal plate; 29. ​​Connecting pipe;

[0043] 3. Oil tank; 31. Oil tank shell; 32. Oil inlet pipe; 33. Bottom sealing plate; 34. Air duct; 35. Air outlet; 36. Slider; 37. Electric push rod;

[0044] 4. Telescopic tube; 5. Fixed plate; 6. Transformer coil; 7. Fan. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] 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" 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. Example

[0047] In order to solve the problem of heat dissipation of insulating oil and the problem of oil tank occupying the upper space, please refer to Figures 1-16 As shown, an oil-immersed high-voltage transformer is provided, including a protective body 1, an oil container 2 is arranged inside the protective body 1, the interior of the oil container 2 is filled with insulating oil, a transformer coil 6 is arranged inside the oil container 2, the insulating oil submerges the transformer coil 6 inside, and the insulating oil absorbs the heat generated by the transformer coil 6 during operation, and an oil collecting tank 3 is provided on the lower side of the oil container 2, so as to avoid the oil collecting tank 3 occupying the space above the oil container 2, and at the same time, the shapes of the oil container 2 and the oil collecting tank 3 are set so that the shapes of the oil container 2 and the oil collecting tank 3 cooperate with each other, so as to increase the heat dissipation effect, shorten the pipeline transportation path of the insulating oil, and avoid the need to set a spiral pipeline for heat dissipation.

[0048] The oil collecting tank 3 also stores insulating oil. Several telescopic tubes 4 are provided between the oil container 2 and the oil collecting tank 3. An oil pump is installed on one side of the oil collecting tank 3. The liquid inlet of the oil pump is connected to the interior of the oil collecting tank 3 through a pipe. The liquid outlet of the oil pump delivers insulating oil to the bottom and top of the oil container 2 through two pipes.

[0049] When the temperature of the insulating oil in the oil container 2 rises, the insulating oil in the oil container 2 flows into the oil collecting tank 3 through the telescopic tube 4. A liquid level sensor is provided inside the oil collecting tank 3. When the level of the insulating oil in the oil collecting tank 3 rises to the position of the liquid level sensor, the oil pump transports the insulating oil in the oil collecting tank 3 to the oil container 2. The flowing insulating oil in the oil container 2 flows from the middle position to both sides in the order of top to bottom and then from bottom to top. The upward-flowing insulating oil flows into the oil collecting tank 3 again through the telescopic tube 4, so that the insulating oil can circulate between the oil container 2 and the oil collecting tank 3. At the same time, the insulating oil flows regularly inside the oil container 2, so that there will be no oil flow dead zone inside the oil container 2, thereby avoiding local overheating of the insulating oil. At the same time, the regular flow of the insulating oil allows the insulating oil to better contact with the mutual inductor coil 6, further improving the insulating oil's absorption of the heat generated by the mutual inductor coil 6, and ensuring the normal use of the mutual inductor coil 6.

[0050] The oil collecting tank 3 moves up and down on the lower side of the oil container 2 to adjust the size of the gap between the oil container 2 and the oil collecting tank 3. When the device is in normal use, the gap distance between the oil container 2 and the oil collecting tank 3 is the largest, and the external airflow enters between the oil container 2 and the oil collecting tank 3 through the side of the protective body 1, and flows downward from the middle of the oil collecting tank 3. The oil container 2 and the oil collecting tank 3 are cooled by the external airflow, so as to enhance the heat dissipation of the oil container 2 and the oil collecting tank 3. A temperature sensor is installed inside the oil collecting tank 3. When the temperature of the insulating oil is too high, the oil collecting tank 3 moves upward to reduce the gap distance between the oil container 2 and the oil collecting tank 3, and then the oil collecting tank 3 transports airflow between the oil container 2 and the oil collecting tank 3 to further improve the heat dissipation of the oil container 2 and the oil collecting tank 3.

[0051] The following is a detailed description of the structure of the oil container 2 and the oil collecting tank 3. Figures 6-11 The oil container 2 includes an oil container shell 21. The oil container shell 21 is shaped like an inverted prism, wherein two side walls are arranged vertically and the other two side walls are inwardly concave arcs. The two side walls of the oil container shell 21 are arranged inwardly concave arcs, so as to reduce the space inside the oil container shell 21 and reduce the amount of insulating oil stored in the oil container shell 21. When the oil container 2 transports the insulating oil to the oil collection tank 3, the insulating oil in the oil container 2 can be quickly replaced, thereby speeding up the replacement of the insulating oil in the oil container shell 21. The internal hollow structure of the oil container shell 21 is opened at the top. At this time, the interior of the oil container shell 21 forms a shape with a small bottom and a large top, so that the insulating oil in the oil container shell 21 forms an upper layer and a lower layer with less insulating oil. The insulating oil and the mutual inductor coil 6 are both arranged inside the oil container shell 21, and a top cover 22 is fixedly installed on the top of the oil container shell 21 to cover the top of the oil container shell 21.

[0052] A conical bottom groove 211 is provided on the bottom side wall of the oil container housing 21. A connecting pipe 29 is connected to the bottom of the conical bottom groove 211. One of the pipes at the outlet end of the oil pump is connected to the connecting pipe 29, and the other pipe is connected to a position near the top middle of one side of the oil container housing 21. The diameter of the pipe connected to the connecting pipe 29 is smaller than the diameter of the pipe near the top of the oil container housing 21. In this way, the amount of insulating oil entering the upper side of the oil container housing 21 is greater than the amount of insulating oil entering the lower side of the oil container housing 21, thereby The direction of the overall insulating oil flow within the oil-containing housing 21 is controlled. A conical plate 26 is installed within the conical bottom groove 211. The conical plate 26 guides the liquid entering the oil-containing housing 21 from the connecting pipe 29 toward the periphery of the oil-containing housing 21. A plurality of arc-shaped guide bars are fixed in a circular array on the side wall between the conical plate 26 and the conical bottom groove 211. The insulating oil entering the oil-containing housing 21 from the connecting pipe 29 is guided by the guide bars, so that the insulating oil can form a spiral oil flow at the bottom of the oil-containing housing 21.

[0053] Several arc-shaped protrusions 212 are fixed on opposite sides of the oil container shell 21 near the top. That is, the arc-shaped protrusions 212 are fixed on the concave arc surface of the oil container shell 21. A mounting groove is provided on the arc-shaped protrusions 212. An arc-shaped double-layer metal plate 28 is mounted on the arc-shaped protrusions 212. The double-layer metal plate 28 is set in the mounting groove, wherein one end of the double-layer metal plate 28 is fixed on the arc-shaped protrusion 212 and the other end covers the arc-shaped protrusion 212. The outer side of the oil container shell 21 and the outer side of the oil container shell 21 are connected. The oil outlet pipe 27 is fixed at the position corresponding to the position of the arc-shaped protrusion 212. A circulation groove 213 connected to the oil outlet pipe 27 is opened on the arc-shaped protrusion 212 away from the position connected to the double-layer metal plate 28. The double-layer metal plate 28 blocks the circulation groove 213 at room temperature. It should be noted here that when the double-layer metal plate 28 blocks the circulation groove 213, it does not completely block the circulation groove 213, but slowly transports insulating oil to the oil outlet pipe 27 through the circulation groove 213.

[0054] When the oil-immersed transformer is in normal use, the temperature of the insulating oil inside the oil-containing housing 21 generally does not exceed 85°C, and is allowed to reach 95°C for a short time. At this time, if the heat in the insulating oil cannot flow or the insulating oil flows too slowly, the heat generated by the transformer coil 6 will accumulate in the insulating oil. In order to ensure that the insulating oil flows slowly at low temperatures and quickly at high temperatures, this solution uses a double-layer metal plate 28. The double-layer metal plate 28 is composed of two metals, which can be iron and copper, or steel and nickel-titanium alloy. The requirement for selecting the metal is that one metal has a large thermal expansion coefficient and the other metal has a small thermal expansion coefficient. When the insulating oil heats up, the metal with a small thermal expansion coefficient expands less, while the metal with a large thermal expansion coefficient expands more. At this time, the metal with a large expansion coefficient will bend toward the side of the metal with a small expansion coefficient. In this solution, the metal with a large expansion coefficient is placed close to the arc-shaped protrusion 212, and the metal with a small expansion coefficient is placed away from the arc-shaped protrusion 212. When the insulating oil heats up, one end of the double-layer metal plate 28 will bend in the direction away from the arc-shaped protrusion 212. At this time, the double-layer metal plate 28 begins to gradually release the obstruction of the flow groove 213, so that the area connecting the flow groove 213 and the inside of the oil-containing shell 21 becomes larger and larger, thereby increasing the amount of insulating oil flowing.

[0055] In order to make the double-layer metal plate 28 more obvious when bending, the arc-shaped protrusion 212 is set to be an arc protruding into the inside of the oil-containing shell 21, and the flow groove 213 is set at a position away from the connection between the arc-shaped protrusion 212 and the double-layer metal plate 28. When the insulating oil is at normal temperature, one end of the double-layer metal plate 28 covers the flow groove 213, allowing the flow groove 213 to slowly flow insulating oil. When the insulating oil heats up, the double-layer metal plate 28 with the arc-shaped protrusion 212 located on the flow groove 213 is heated and bent in a direction away from the arc-shaped protrusion 212. The contact position between the double-layer metal plate 28 and the arc-shaped protrusion 212 also expands and bends, thereby increasing the degree of bending of the double-layer metal plate 28, thereby making it easier for the double-layer metal plate 28 to remove the obstruction of the flow groove 213.

[0056] In order to facilitate the control of the flow direction of the insulating oil in the oil holding shell 21, a heat dissipation fin rack 24 is installed near the bottom of the oil holding shell 21. The heat dissipation fin rack 24 is composed of several metal plates fixed together by bolts, and there is a gap between each metal plate. The shape of the heat dissipation fin rack 24 matches the shape of the bottom of the oil holding shell 21. A partition basin 23 is installed inside the heat dissipation fin rack 24. The mutual inductor coil 6 is arranged in the partition basin 23, and the mutual inductor coil 6 is fixed inside the partition basin 23 by a mounting frame. The heat dissipation fin rack 24 supports the position of the partition basin 23 and locates the position of the partition basin 23 in the oil holding shell 21. At the same time, the shape of the partition basin 23 and the shape type of the oil holding shell 21 are inverted prism shapes. Two side walls of the partition basin 23 are tightly fitted with the side walls of the oil holding shell 21, that is, the opposite side walls of the upper end of the partition basin 23 are tightly fitted with the vertical side walls of the oil holding shell 21. The oil pan 21 is provided with a plurality of holes 25 on the top of the oil pan 21, and the holes 25 on the top of the oil pan 21 are connected to the oil pan 21. The oil pan 21 is provided with a plurality of holes 25 on the top of the oil pan 21, and the holes 25 on the bottom of the oil pan 21 are connected to the oil pan 21.

[0057] During use, the oil pump transports the insulating oil in the oil collecting tank 3 to both the upper and lower sides of the oil containing shell 21. The amount of insulating oil transported to the upper side of the oil containing shell 21 is greater than the amount transported downward. The insulating oil in the oil containing shell 21 is transported to the oil collecting tank 3 through the circulation groove 213. At this time, the insulating oil entering the upper side of the oil containing shell 21 flows downward. In the process of the insulating oil flowing downward, the insulating oil that absorbs heat near the mutual inductor coil 6 is pushed downward, so that the insulating oil is away from the mutual inductor coil 6. The pushed downward insulating oil enters the upstream space, and the insulating oil entering the oil containing shell 21 from the connecting pipe 29 is guided by the conical plate 26, so that the insulating oil entering the upstream space flows to the surrounding areas of the oil containing shell 21, and then enters the oil collecting tank 3 through the circulation groove 213.

[0058] The interior of the oil housing 21 is divided into two parts by the partition basin 23 and the partition plate 25. The insulating oil in the oil housing 21 flows downward from the middle of the interior of the oil housing 21, and then moves upward from the bottom of the oil housing 21. In this way, the insulating oil in the oil housing 21 can form a flow path inside the oil housing 21, thereby avoiding the dead zone of oil flow inside the oil housing 21 and avoiding local heat accumulation in the oil housing 21. At the same time, the oil pump divides the insulating oil in the oil collecting tank 3 into two channels and transports it to the oil housing 21. The insulating oil in the oil container 2 flows to the collecting tank 3. When flowing in the oil tank 3, the insulating oil transported to the upper end of the oil-containing shell 21 will flow downward, so that the insulating oil newly entering the oil-containing shell 21 will contact the transformer coil 6, so that the insulating oil can better absorb the heat dissipated from the transformer coil 6. The insulating oil entering the oil-containing shell 21 from the connecting pipe 29 is guided by the conical plate 26 to the edge of the oil-containing shell 21, and then moves upward and flows into the oil collecting tank 3 through the circulation groove 213. In this way, the flow speed of the insulating oil in the oil-containing shell 21 is accelerated, and the heat dissipation effect of the insulating oil on the transformer coil 6 is improved.

[0059] Please refer to Figure 12-13 The oil collection tank 3 includes an oil tank shell 31, which is U-shaped. The oil tank shell 31 is arranged directly below the oil holding shell 21, and the bottom of the oil holding shell 21 is arranged inside the oil tank shell 31. A gap is left between the oil tank shell 31 and the oil holding shell 21. Several oil inlet pipes 32 corresponding to the positions of the oil outlet pipe 27 are fixed at both ends of the oil tank shell 31. The oil inlet pipe 32 and the oil outlet pipe 27 are connected by a telescopic pipe 4. The pipeline at the liquid inlet end of the oil pump passes through the side wall of the oil tank shell 31 and is arranged at the inner bottom of the oil tank shell 31. The telescopic pipe 4 consists of two pipes slidably connected together, and one end of the two pipes is sealed with the oil outlet pipe 27 and the oil inlet pipe 32 respectively. The liquid level sensor and the temperature sensor are both installed inside the oil tank shell 31. The temperature sensor detects the temperature of the insulating oil in the oil tank shell 31, and the liquid level sensor detects the height of the insulating oil in the oil tank shell 31.

[0060] When there is air flow from the outside, the gas can be blown into the gap between the oil holding shell 21 and the oil tank shell 31 to absorb the heat emitted from the oil holding shell 21 and the oil tank shell 31.

[0061] In order to enhance the heat dissipation effect of the oil holding shell 21 and the oil tank shell 31 and reduce the temperature of the insulating oil, an air outlet 35 is opened in the middle position of the upper side of the oil tank shell 31, and an installation opening is opened in the middle position of the lower side of the oil tank shell 31, in which a bottom sealing plate 33 is installed, and an air duct 34 is fixed on the bottom sealing plate 33, and the other end of the air duct 34 is tightly connected to the air outlet 35, and a fan 7 is installed inside the air duct 34. When the blades of the fan 7 rotate, the air flow generated by the fan 7 blows upward, so that the air flow enters between the oil holding shell 21 and the oil tank shell 31. With the help of the air flow generated by the fan 7, the flow speed between the oil holding shell 21 and the oil tank shell 31 is accelerated, thereby accelerating the heat dissipation between the oil holding shell 21 and the oil tank shell 31.

[0062] refer to Figure 5 、 Figure 12 The protective body 1 includes a protective shell 11. The protective shell 11 can be assembled according to the needs of installation. Multiple metal plates can be connected together by bolts or directly welded together. This solution provides a welding solution to fix the oil container shell 21 on the top position of the protective shell 11, that is, the top cover 22 and the oil container shell 21 are tightly connected. Fixed plates 5 are screwed on both sides of the oil container shell 21, and the fixed plates 5 are also screwed to the top cover 22 to improve the stability of the connection between the oil container shell 21 and the top cover 22. At the same time, the top cover 22 is fixed to the protective shell 11 by bolts to achieve the positioning of the oil container 2.

[0063] Vents 12 are provided in the upper halves of opposite sides of the protective shell 11, the fuel tank shell 31 is arranged in the lower half of the protective shell 11, the telescopic tube 4 is arranged at the position of the vents 12, a bottom opening 13 is provided at the bottom of the protective shell 11, and the fan 7 is arranged above the bottom opening 13.

[0064] When air from the outside passes through the gap between the oil holding shell 21 and the oil tank shell 31, and then flows downward through the air duct 34, when the fan 7 starts to rotate, the air flow flows between the oil holding shell 21 and the oil tank shell 31, accelerating the speed of the air flow between the oil holding shell 21 and the oil tank shell 31.

[0065] In order to enhance the heat dissipation effect of the airflow blown by the fan 7 on the insulating oil in the oil container 2 and the oil collecting tank 3, a number of vertically arranged sliders 36 are fixed on the side wall of the oil tank shell 31, and a number of slideways 14 corresponding to the positions of the sliders 36 are fixed on the inner wall of the protective shell 11. The sliders 36 are slidably arranged inside the slideways 14. Through the sliding coordination between the slideways 14 and the sliders 36, the oil collecting tank 3 can move up and down stably inside the protective body 1. At the same time, when the oil collecting tank 3 moves to the farthest distance from the oil container 2, the slideways 14 can support the sliders 36, so that the oil collecting tank 3 can be stably fixed inside the protective body 1. At the same time, an electric push rod 37 is symmetrically hinged at the bottom of the oil tank shell 31. The other end of the electric push rod 37 is hinged to the bottom of the protective shell 11. When the piston rod of the electric push rod 37 is extended and retracted, it drives the oil tank shell 31 to move up and down inside the protective shell 11, thereby adjusting the gap between the oil container 2 and the oil collecting tank 3.

[0066] This device includes the following states when in use:

[0067] For initial use, please refer to Figure 14 In the direction of the hollow arrow, the electric push rod 37 is retracted, causing the oil collecting tank 3 to move down to the maximum distance. At this time, the slider 36 contacts the bottom of the slideway 14. At this time, the distance between the oil receiving shell 21 and the oil tank shell 31 is the largest. The external airflow enters the space between the oil receiving shell 21 and the oil tank shell 31 through the vent 12. The external airflow carries away the heat radiated from the oil receiving shell 21 and the oil tank shell 31. The airflow entering the oil receiving shell 21 and the oil tank shell 31 is blown out from the bottom of the oil collecting tank 3 through the air outlet 35 and the air duct 34.

[0068] When there is no wind outside, the heat on the oil housing 21 and the oil tank shell 31 can only be dissipated slowly. When the temperature sensor detects that the temperature of the insulating oil in the oil tank shell 31 rises to a certain value, such as when the temperature rises to 50 degrees, the fan 7 starts to work. Please refer to Figure 15 In the direction of the hollow arrow, the airflow generated by the fan 7 moves between the oil holding shell 21 and the oil tank shell 31 and is blown out through the vent 12, thereby ensuring normal heat dissipation of the oil holding shell 21 and the oil tank shell 31;

[0069] When the temperature in the oil tank shell 31 is too high, such as above 85, the transformer coil 6 is under load and needs to be quickly cooled. At this time, the push rod of the electric push rod 37 is extended, so that the electric push rod 37 drives the oil tank shell 31 to move upward, narrowing the gap between the oil housing 21 and the oil tank shell 31. Please refer to Figure 16In the direction of the hollow arrow, the airflow of the fan 7 enters between the oil holding shell 21 and the oil tank shell 31. Because the distance between the oil holding shell 21 and the oil tank shell 31 becomes smaller, the flow speed of the airflow entering the fan 7 will increase, so that the airflow can quickly carry away the heat on the oil holding shell 21 and the oil tank shell 31, accelerating the diffusion of heat. At the same time, the airflow passing through the vent 12 will blow on the telescopic tube 4, blowing away the heat diffused on the telescopic tube 4, further reducing the temperature of the insulating oil.

[0070] During the use of the device, refer to Figure 14-16 In the direction of the solid arrow in FIG, the insulating oil in the upstream space of the oil holding shell 21 slowly flows into the oil outlet pipe 27 through the gap between the double-layer metal plate 28 and the flow groove 213. The insulating oil entering the oil outlet pipe 27 accumulates in the oil tank shell 31. The heat of the insulating oil diffuses to the outside through the oil tank shell 31. When the liquid level in the oil tank shell 31 is sensed by the liquid level sensor, the oil pump starts to operate and transports the oil in the oil tank shell 31 to the oil holding shell 21. Part of the insulating oil is transported to the downstream space, and part of the insulating oil enters the upstream space located on the lower side of the partition basin 23.

[0071] When the temperature of the insulating oil in the oil holding shell 21 increases, the double-layer metal plate 28 begins to bend, and the insulating oil in the upstream space begins to flow rapidly into the circulation groove 213. At this time, the insulating oil added to the downstream space flows downward, replacing the insulating oil near the transformer coil 6, and the insulating oil near the transformer coil 6 flows downward and crosses the partition basin 23 into the upstream space. The insulating oil entering the oil holding shell 21 from the connecting pipe 29 flows to the surrounding areas of the oil holding shell 21 through the guidance of the conical plate 26. At this time, the insulating oil in the upstream space flows upward and enters the oil collecting tank 3 through the circulation groove 213. This cycle is repeated, so that there will be no oil flow dead zone in the oil holding shell 21, thereby solving the problem of local high temperature.

[0072] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil-immersed high-voltage transformer, comprising a protective body (1), an oil container (2) disposed inside the protective body (1), the oil container (2) being filled with insulating oil, a transformer coil (6) being disposed inside the oil container (2), the transformer coil (6) being submerged in the insulating oil, and characterized in that: An oil collecting tank (3) is provided on the lower side of the oil container (2), a plurality of telescopic tubes (4) are provided between the oil container (2) and the oil collecting tank (3), an oil pump is installed on one side of the oil collecting tank (3), a liquid inlet end of the oil pump is connected to the inside of the oil collecting tank (3) through a pipeline, and a liquid outlet end of the oil pump transports insulating oil to the bottom and top of the inside of the oil container (2) through two pipelines; When the temperature of the insulating oil in the oil container (2) rises, the insulating oil in the oil container (2) flows into the oil collecting tank (3) through the telescopic tube (4), and the oil pump transports the insulating oil in the oil collecting tank (3) into the oil container (2). The insulating oil flows from the middle position to both sides of the oil container (2) in the order of from top to bottom and then from bottom to top. The oil collecting box (3) moves up and down on the lower side of the oil container (2) to adjust the size of the gap between the oil container (2) and the oil collecting box (3). The external air flow enters between the oil container (2) and the oil collecting box (3) through the side of the protective body (1) and flows downward from the middle of the oil collecting box (3).

2. The oil-immersed high-voltage transformer according to claim 1, characterized in that: The oil container (2) includes an oil container shell (21). The oil container shell (21) is in the shape of an inverted prism with an opening at the top. The insulating oil and the mutual inductor coil (6) are both arranged inside the oil container shell (21). A top cover (22) is fixedly installed on the top of the oil container shell (21) to cover the top of the oil container shell (21).

3. The oil-immersed high-voltage transformer according to claim 2, characterized in that: A conical bottom groove (211) is provided on the bottom side wall of the oil holding shell (21), and a connecting pipe (29) is connected to the bottom of the conical bottom groove (211). One of the pipes at the liquid outlet of the oil pump is connected to the connecting pipe (29), and the other pipe is connected to a position near the top middle of one side of the oil holding shell (21). The diameter of the pipe connected to the connecting pipe (29) is smaller than the diameter of the pipe near the top of the oil holding shell (21). A conical plate (26) is installed inside the conical bottom groove (211), and the conical plate (26) guides the liquid entering the oil holding shell (21) from the connecting pipe (29) to the surrounding areas of the oil holding shell (21).

4. The oil-immersed high-voltage transformer according to claim 2, characterized in that: A plurality of arc-shaped protrusions (212) are fixed on opposite sides of the oil-containing shell (21) near the top. An arc-shaped double-layer metal plate (28) is installed on the arc-shaped protrusion (212). The double-layer metal plate (28) is composed of two metals. When the insulating oil is heated, one end of the double-layer metal plate (28) is bent in a direction away from the arc-shaped protrusion (212). An oil outlet pipe (27) is fixed at a position corresponding to the position of the arc-shaped protrusion (212) on the outside of the oil-containing shell (21). A flow groove (213) connected to the oil outlet pipe (27) is opened on the arc-shaped protrusion (212) away from the position connected to the double-layer metal plate (28). The double-layer metal plate (28) blocks the flow groove (213) at room temperature.

5. The oil-immersed high-voltage transformer according to claim 4, characterized in that: A heat dissipation fin (24) is installed near the bottom of the oil container housing (21), and a partition basin (23) is installed inside the heat dissipation fin (24). The mutual inductor coil (6) is arranged in the partition basin (23), and the bottom of the partition basin (23) is arranged on the upper side of the conical plate (26). The bottom of the partition basin (23) is provided with a plurality of through openings, and the insulating oil in the partition basin (23) moves to the lower side of the partition basin (23) through the through openings.

6. The oil-immersed high-voltage transformer according to claim 5, characterized in that: Two side walls of the separation basin (23) are tightly fitted with the side walls of the oil-containing shell (21), and a separation plate (25) is fixedly connected to the top of the other two side walls of the separation basin (23). The other end of the separation plate (25) extends to the upper side of the arc-shaped protrusion (212) and is fixed to the oil-containing shell (21). The separation basin (23) and the two separation plates (25) divide the interior of the oil-containing shell (21) into two upper and lower spaces.

7. The oil-immersed high-voltage transformer according to claim 4, characterized in that: The oil collecting tank (3) includes an oil tank shell (31), which is U-shaped. The oil tank shell (31) is arranged directly below the oil holding shell (21), and the bottom of the oil holding shell (21) is arranged inside the oil tank shell (31). A plurality of oil inlet pipes (32) corresponding to the positions of the oil outlet pipes (27) are fixed at both ends of the oil tank shell (31). The oil inlet pipes (32) and the oil outlet pipes (27) are connected by a telescopic pipe (4). The pipeline at the liquid inlet end of the oil pump passes through the side wall of the oil tank shell (31) and is arranged at the inner bottom of the oil tank shell (31).

8. The oil-immersed high-voltage transformer according to claim 7, characterized in that: An air outlet (35) is provided in the middle of the upper side of the oil tank shell (31), and an installation opening is provided in the middle of the lower side of the oil tank shell (31). A bottom sealing plate (33) is installed in the installation opening. An air duct (34) is fixed to the bottom sealing plate (33). The other end of the air duct (34) is tightly connected to the air outlet (35), and a fan (7) is installed inside the air duct (34).

9. The oil-immersed high-voltage transformer according to claim 8, characterized in that: The protective body (1) includes a protective shell (11), the oil container shell (21) is fixedly mounted on the top of the protective shell (11), vents (12) are provided on the upper halves of opposite sides of the protective shell (11), the oil tank shell (31) is arranged on the lower half of the protective shell (11), the telescopic tube (4) is arranged at the position of the vent (12), the bottom of the protective shell (11) is provided with a bottom opening (13), and the fan (7) is arranged above the bottom opening (13).

10. The oil-immersed high-voltage transformer according to claim 9, characterized in that: A plurality of vertically arranged sliders (36) are fixed on the side wall of the oil tank shell (31), and a plurality of slideways (14) corresponding to the positions of the sliders (36) are fixed on the inner side wall of the protective shell (11). The sliders (36) are slidably arranged inside the slideways (14). An electric push rod (37) is hinged symmetrically at the bottom of the oil tank shell (31). The other end of the electric push rod (37) is hinged to the bottom of the protective shell (11). When the piston rod of the electric push rod (37) is extended or retracted, it drives the oil tank shell (31) to move up and down inside the protective shell (11).

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