Transformer

Abstract

The invention relates to the technical field of transformers, in particular to a transformer which comprises an oil-immersed transformer box, the oil-immersed transformer box is filled with insulating oil, a box cover is arranged at the top end of the oil-immersed transformer box, an oil conservator and an anti-explosion assembly are installed on the box cover, the anti-explosion assembly comprises a recycling barrel connected to the oil-immersed transformer box, and the recycling barrel is connected to the oil-immersed transformer box. The explosion-proof assembly further comprises an explosion-proof pipe which is connected into the oil-immersed transformer box through the box cover and inserted into the insulating oil, the other end of the explosion-proof pipe is connected to the recycling barrel, and a pressing plate and sponge filler are arranged in the recycling barrel. According to the oil-immersed transformer box disclosed by the utility model, the high temperature of the insulating oil in the oil-immersed transformer box is utilized to circulate into the oil-immersed transformer box to degrade the high temperature, so that the explosion-proof pipe has an explosion-proof property, the insulating oil is not wasted, the temperature of the oil-immersed transformer box is automatically balanced, and the explosion-proof property of the oil-immersed transformer box is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and particularly to a transformer. Background Art

[0002] Industrial transformers are key devices in the power system for voltage transformation, power distribution, and electrical isolation, and are widely used in high-load scenarios such as manufacturing, mining, metallurgy, chemical industry, and data centers. Compared with ordinary power transformers, industrial transformers need to have characteristics such as higher reliability and heat resistance. To improve their heat resistance, oil-immersed transformers are a common type of industrial transformer. There is insulating oil in the transformer tank, and the iron-clad coil is placed in the insulating oil to achieve heat dissipation and insulation using the insulating oil, suitable for medium and large-sized occasions. In addition, an oil pillow is provided on the transformer tank to balance its oil volume space.

[0003] To improve safety, an explosion-proof tube is also provided at the top of the transformer tank. When the oil temperature exceeds 85 degrees, the insulating oil enters the explosion-proof tube, breaks through the explosion-proof membrane, and automatically relieves pressure to prevent the transformer from bursting. The insulating oil will be discharged from the explosion-proof tube outside the transformer tank, which will not only pollute the surrounding environment, but also when the transformer is at a high temperature, the insulating oil cannot achieve temperature reduction and pressure relief through recycling, resulting in losses. Summary of the Invention

[0004] To solve the above problems, the present invention provides a transformer, including an oil-immersed transformer tank filled with insulating oil. The top of the oil-immersed transformer tank is provided with a tank cover, and an oil pillow and an explosion-proof component are installed on the tank cover. The explosion-proof component includes a recovery cylinder connected to the oil-immersed transformer tank. A first pipeline is connected between the top of the recovery cylinder and the oil pillow. The explosion-proof component further includes an explosion-proof tube connected from the tank cover to the inside of the oil-immersed transformer tank and inserted into the insulating oil, and the other end of the explosion-proof tube is connected to the recovery cylinder. A pressing plate and a sponge filler are provided in the recovery cylinder, and the pressing plate presses on the sponge filler. A refrigeration pipe is also filled in the recovery cylinder. One ends of the first pipeline and the explosion-proof tube connected to the recovery cylinder are close to the refrigeration pipe. A recovery pipe is provided in the oil-immersed transformer tank, and a second pipeline is connected between the recovery cylinder and the recovery pipe.

[0005] As a further preference, the recovery cylinder is a straight cylinder vertically upward and is located at the bottom side of the conservator. There is a pressure chamber left between the top surface of the inner cavity of the recovery cylinder and the top surface of the pressing plate. The refrigeration pipe is filled in the pressure chamber. The refrigeration pipe is composed of multiple spiral pipes stacked and combined from top to bottom. One spiral end thereof penetrates from one side of the recovery cylinder to the outside of the pressure chamber, and the other spiral end thereof penetrates from the other side of the recovery cylinder to the outside of the pressure chamber. The pressing plate is provided with seepage holes. One end of the first pipe connected in the recovery cylinder is located above the refrigeration pipe and communicates with the spiral inner hole of the refrigeration pipe. One end of the explosion-proof pipe connected in the recovery cylinder is located above the refrigeration pipe and communicates with the spiral inner hole of the refrigeration pipe. A support is installed on the outer side of the recovery cylinder, and a fan is installed on the support. The air inlet of the fan corresponds to the air inlets of all the refrigeration pipes.

[0006] As a further preference, a grid-shaped first heat sink is embedded in the spiral inner hole of the refrigeration pipe. One ends of the first pipe and the explosion-proof pipe connected to the recovery cylinder are located above the first heat sink.

[0007] As a further preference, an oil pump is provided on the first pipe, a pressure control valve is provided on the explosion-proof pipe, a controller electrically connected to the pressure control valve is provided on the oil-immersed transformer tank, a pressure sensor electrically connected to the controller is further provided on the explosion-proof pipe, and the fan and the oil pump are electrically connected to the controller.

[0008] As a further preference, the recovery pipe is in multiple wave shapes and surrounds inside the oil-immersed transformer tank along the contour of the cavity wall of the oil-immersed transformer tank. The recovery pipe vertically extends upward from the bottom of the cavity of the oil-immersed transformer tank and is immersed in the insulating oil.

[0009] As a further preference, a number of vertically upward thin springs are filled in the sponge filler. The top ends of the thin springs abut against the bottom surface of the pressing plate. When insulating oil is injected into the pressure chamber, through the supporting action of the thin springs, the pressing plate is enabled to slowly descend along the cavity wall of the recovery cylinder.

[0010] As a further preference, a second heat sink is fixed on the outer wall of the oil-immersed transformer tank. The tank wall of the oil-immersed transformer tank is located between the second heat sink and the refrigeration pipe.

[0011] As a further preference, a pipeline is connected between the conservator and the oil-immersed transformer tank, and a solenoid valve is installed on the pipeline. The solenoid valve is electrically connected to the controller.

[0012] The beneficial effects of the present invention compared with the prior art are:

[0013] 1. When the insulating oil in the oil-immersed transformer box is heated to degrees Celsius due to a fault, according to the existing explosion-proof principle, the insulating oil will rise along the box body, and part of the insulating oil will enter the explosion-proof pipe to relieve the pressure through the insulating oil. In the present invention, when the insulating oil enters the explosion-proof pipe, it will not be directly discharged outside the box, which will not cause waste and will not pollute the surrounding environment. Instead, the pressure control valve will be opened to enter the pressure chamber above the recovery cylinder. As the insulating oil is continuously injected into the pressure chamber, the pressure of the pressure chamber will gradually increase. At this time, the temperature sensor sends a signal to the controller, and the controller controls the fan to automatically start and provide gas to the refrigeration pipe. The spiral of the refrigeration pipe is located in the pressure chamber, so the entering The insulating oil is cooled by heat exchange, and the gas is discharged from the other end of the refrigeration pipe to the outside of the pipe. New gas enters the refrigeration pipe again, so that the pressure chamber is always at a low temperature, and the insulating oil is continuously cooled by heat exchange. Finally, it flows into the recovery pipe from the second pipe. The recovery pipe is located in the oil-immersed transformer box. After heat exchange and cooling, the insulating oil flows back to the oil-immersed transformer box through the recovery pipe again, reacts with the high-temperature oil in the oil-immersed transformer box, and cools the high-temperature oil. The high temperature of the insulating oil in the oil-immersed transformer box is utilized and circulated to the oil-immersed transformer box to degrade the high temperature. Not only does the explosion-proof pipe have explosion-proof properties, but also the explosion-proof performance of the oil-immersed transformer box is further improved without wasting insulating oil.

[0014] 2. The present invention also utilizes the oil pillow of the transformer. When the insulating oil in the oil-immersed transformer box enters the explosion-proof pipe and the temperature sensor sends a signal to the controller, and the controller controls the fan to start automatically, the controller will also control the oil pump to start, and the oil pump will replenish the insulating oil to the pressure chamber through the first pipeline. This part of the insulating oil will be mixed with the insulating oil entering the pressure chamber from the explosion-proof pipe, so that the oil temperature from the oil pillow will be quickly reduced, and then the two parts of the insulating oil will enter the pressure chamber again and be cooled by the refrigeration pipe, and finally penetrate into the sponge filling material, and finally flow into the oil-immersed transformer box through the recovery pipe to cool the insulating oil that is heating up in the oil-immersed transformer box by heat exchange, thereby accelerating the heat exchange efficiency and effectively replenishing the insulating oil in the oil-immersed transformer box. Under the action of the oil pump, the oil inlet pressure is greater than the supporting force of the thin spring on the pressure plate. As the oil pressure in the pressure chamber increases, the pressure plate will also drop and squeeze the sponge filler while dropping. The cooled insulating oil is slowly transported into the sponge filler, and the insulating oil in the sponge filler is discharged into the oil-immersed transformer box through the recovery pipe by squeezing for heat exchange and cooling, thereby improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A main plan view of a transformer provided in an embodiment of the present invention;

[0016] Figure 2 A transformer provided in an embodiment of the present invention comprises Figure 1 The enlarged view of the A part is shown;

[0017] Figure 3 A top-down plan view of a dissected transformer provided by an embodiment of the present invention;

[0018] Figure 4 A schematic diagram of a partially dissected oil-immersed transformer tank in a transformer provided by an embodiment of the present invention from a top-down perspective;

[0019] Figure 5 A schematic diagram of a transformer recovery cylinder only provided by an embodiment of the present invention;

[0020] Figure 6 Provided by an embodiment of the present invention, a transformer is composed of Figure 5 A schematic diagram of a partially dissected transformer led out;

[0021] Figure 7 Provided by an embodiment of the present invention, a transformer is composed of Figure 6 A schematic diagram of the transformer led out from a bottom-up perspective.

[0022] In the figure: 1. Oil-immersed transformer tank; 2. Explosion-proof component; 3. Tank cover; 4. Oil conservator; 5. Explosion-proof pipe; 6. Recovery cylinder; 7. First pipeline; 8. Oil pump; 9. Pressure plate; 10. Sponge filler; 11. Refrigeration pipe; 12. Recovery pipe; 13. Second pipeline; 14. Pressure chamber; 15. Pressure control valve; 16. Perforation; 17. First heat sink; 18. Fine spring; 19. Second heat sink; 20. Support; 21. Fan; 22. Oil pipe; 23. Solenoid valve. Specific embodiments

[0023] The following will clearly and completely describe the above and other embodiments and advantages of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments.

[0024] In one embodiment, as Figures 1 - 7 shown:

[0025] This embodiment provides a transformer, which includes an oil-immersed transformer tank 1 filled with insulating oil. A tank cover 3 is provided at the top of the oil-immersed transformer tank 1. An oil conservator 4 and an explosion-proof component 2 are installed on the tank cover 3. The explosion-proof component 2 includes a recovery cylinder 6 connected to the immersed transformer tank 1. A first pipeline 7 is connected between the top of the recovery cylinder 6 and the top of the oil conservator 4. The explosion-proof component 2 further includes an explosion-proof pipe 5 connected from the tank cover 3 to the inside of the oil-immersed transformer tank 1 and inserted into the insulating oil. The other end of the explosion-proof pipe 5 is connected to the recovery cylinder 6. A pressing plate 9 and a sponge filler 10 are provided in the recovery cylinder 6. The pressing plate 9 presses on the sponge filler 10. A refrigeration pipe 11 is also filled in the recovery cylinder 6. One ends of the first pipeline 7 and the explosion-proof pipe 5 connected to the recovery cylinder 6 are close to the refrigeration pipe 11. A recovery pipe 12 is provided in the oil-immersed transformer tank 1. A second pipeline 13 is connected between the recovery cylinder 6 and the recovery pipe 12.

[0026] As a further preference, the recovery cylinder 6 is a straight cylinder vertically upward and is located at the bottom side of the oil conservator 4. A pressing cavity 14 is left between the top of the inner cavity of the recovery cylinder 6 and the top surface of the pressing plate 9. The refrigeration pipe 11 is filled in the pressing cavity 14. The refrigeration pipe 11 is composed of multiple spiral pipes stacked and combined from top to bottom. One spiral end thereof penetrates from one side of the recovery cylinder 6 to the outside of the pressing cavity 14, and the other spiral end thereof penetrates from the other side of the recovery cylinder 6 to the outside of the pressing cavity 14. The pressing plate 9 is provided with seepage holes 16. One end of the first pipeline 7 connected in the recovery cylinder 6 is located above the refrigeration pipe 11 and is communicated with the spiral inner hole of the refrigeration pipe 11. One end of the explosion-proof pipe 5 connected in the recovery cylinder 6 is located above the refrigeration pipe 11 and is communicated with the spiral inner hole of the refrigeration pipe 11. A bracket 20 is installed on the outside of the recovery cylinder 6. A fan 21 is installed on the bracket 20. The air inlet of the fan 21 corresponds to the air inlets of all the refrigeration pipes 11.

[0027] As a further preference, a grid-shaped first heat sink 17 is inlaid in the spiral inner hole of the refrigeration pipe 11. One ends of the first pipeline 7 and the explosion-proof pipe 5 connected to the recovery cylinder 6 are located above the first heat sink 17.

[0028] As a further preference, an oil pump 8 is provided on the first pipeline 7, a pressure control valve 15 is provided on the explosion-proof pipe 5, a controller electrically connected to the pressure control valve 15 is provided on the oil-immersed transformer tank 1, a pressure sensor electrically connected to the controller is further provided on the explosion-proof pipe 5, and the fan 21 and the oil pump 8 are electrically connected to the controller.

[0029] As a further preference, the recovery pipe 12 is in multiple wave shapes. The recovery pipe 12 surrounds the inside of the oil-immersed transformer tank 1 along the contour of the cavity wall of the oil-immersed transformer tank 1. The recovery pipe 12 is vertically upward immersed in the insulating oil from the bottom of the cavity of the oil-immersed transformer tank 1.

[0030] As a further preference, several vertically upward thin springs 18 are filled in the sponge filler 10. The top ends of the thin springs 18 abut against the bottom surface of the pressing plate 9. When insulating oil is injected into the pressure chamber 14, the support of the thin springs 18 is used to make the pressing plate 9 slowly descend along the inner wall of the recovery cylinder 6.

[0031] As a further preference, a second heat sink 19 is fixed on the outer wall of the oil-immersed transformer tank 1, and the tank wall of the oil-immersed transformer tank 1 is located between the second heat sink 19 and the refrigeration pipe 11.

[0032] As a further preference, a pipeline 22 is connected between the oil conservator 4 and the oil-immersed transformer tank 1. An electromagnetic valve 23 is installed on the pipeline 22, and the electromagnetic valve 23 is electrically connected to the controller.

[0033] As a further preference, the recovery cylinder 6 is a vertically upward straight cylinder and is located at the bottom side of the oil conservator 4. A pressure chamber 14 is left between the top of the inner cavity of the recovery cylinder 6 and the top surface of the pressing plate 9. The refrigeration pipe 11 is filled in the pressure chamber 14. The refrigeration pipe 11 is composed of multiple spiral pipes stacked from top to bottom. One spiral end thereof penetrates from one side of the recovery cylinder 6 to the outside of the pressure chamber 14, and the other spiral end thereof penetrates from the other side of the recovery cylinder 6 to the outside of the pressure chamber 14. The pressing plate 9 is provided with seepage holes 16. One end of the first pipeline 7 connected in the recovery cylinder 6 is located above the refrigeration pipe 11 and communicates with the spiral inner hole of the refrigeration pipe 11. One end of the explosion-proof pipe 5 connected in the recovery cylinder 6 is located above the refrigeration pipe 11 and communicates with the spiral inner hole of the refrigeration pipe 11. A support 20 is installed on the outside of the recovery cylinder 6, and a fan 21 is installed on the support 20. The air inlet of the fan 21 corresponds to the air inlets of all the refrigeration pipes 11.

[0034] A grid-shaped first heat sink 17 is embedded in the spiral inner hole of the refrigeration pipe 11. One ends of the first pipeline 7 and the explosion-proof pipe 5 connected to the recovery cylinder 6 are located above the first heat sink 17. The setting of the first heat sink 17 enables a lining-type heat dissipation structure to be formed in the spiral shape of the refrigeration pipe 11, assisting the refrigeration pipe 11 to more effectively cool the insulating oil coming from the explosion-proof pipe 5 and the oil conservator 4.

[0035] Several vertically upward thin springs 18 are filled in the sponge filler 10. The top ends of the thin springs 18 abut against the bottom surface of the pressing plate 9. When insulating oil is injected into the pressure chamber 14, the support of the thin springs 18 is used to make the pressing plate 9 slowly descend along the inner wall of the recovery cylinder 6. An oil pump 8 is provided on the first pipeline 7, a pressure control valve 15 is provided on the explosion-proof pipe 5, a controller electrically connected to the pressure control valve 15 is provided on the oil-immersed transformer tank 1, a pressure sensor electrically connected to the controller is further provided on the explosion-proof pipe 5, and the fan 21 and the oil pump 8 are electrically connected to the controller.

[0036] Working principle and technical effect: When the insulating oil in the oil-immersed transformer tank 1 heats up to 85 degrees Celsius due to a fault, according to the existing explosion-proof principle, the insulating oil will rise along the tank body, and part of the insulating oil enters the explosion-proof pipe 5 for pressure relief through the insulating oil. In the present invention, when the insulating oil enters the explosion-proof pipe 5, it will not be directly discharged outside the tank, will not cause waste, and will not pollute the surrounding environment. Instead, it will push open the pressure control valve 15 and enter the pressure chamber 14 above the recovery cylinder 6. As the insulating oil continuously injects into the pressure chamber 14, the pressure in the pressure chamber 14 will gradually increase. At this time, the temperature sensor sends a signal to the controller, and the controller controls the fan 21 to start automatically and supply gas to the refrigeration pipe 11. Transformers are mostly installed at relatively high positions, so the gas temperature is relatively low. The gas enters the refrigeration pipe 11 to lower the temperature of the pressure chamber 14. Since the spiral part of the refrigeration pipe 11 is located in the pressure chamber 14 as shown in Figure 5 , Figure 6 , it will cause the incoming insulating oil to exchange heat and cool down. The gas is discharged to the outside of the pipe from the other end of the refrigeration pipe 11, and new gas enters the refrigeration pipe 11 again, keeping the pressure chamber 14 at a low temperature and continuously exchanging heat and cooling down the insulating oil. When the pressure stored by the insulating oil in the pressure chamber 14 exceeds the supporting force of the thin spring 18 on the pressure plate 9, the pressure plate 9 will descend, or the insulating oil passes through the seepage holes 16 on the pressure plate 9 and soaks into the sponge filler 10. The settings of the sponge filler 10 and the pressure plate 9 play a slow-down role in the descent of the insulating oil, so that the subsequent insulating oil entering the pressure chamber 14 has a longer residence time in the pressure chamber 14, undergoes heat exchange and cooling for a slightly longer time before entering the sponge filler 10, and then seeps into the bottom second pipe 13 after the slow effect of the sponge filler 10, and finally flows into the recovery pipe 12 through the second pipe 13. The recovery pipe 12 is located in the oil-immersed transformer tank 1. After the insulating oil exchanges heat and cools down, it flows back into the oil-immersed transformer tank 1 through the recovery pipe 12 and reacts with the high-temperature oil in the oil-immersed transformer tank 1 to cool down the high-temperature oil. By using the high temperature of the insulating oil in the oil-immersed transformer tank 1 and recycling it to the oil-immersed transformer tank 1 to cause high-temperature degradation, not only does the explosion-proof pipe 5 have explosion-proof performance, but also without wasting insulating oil and without causing large losses, the explosion-proof performance of the oil-immersed transformer tank 1 is further improved.

[0037] In the present invention, as shown in Figure 2 , Figure 5 and Figure 6 , the refrigeration pipe 11 is made of a pipe group formed by superimposing multiple spiral pipes from top to bottom. In addition to forming long-distance heat exchange and cooling conditions in the height direction, their air inlets and outlets will be in direct contact with the insulating oil, that is, the external air will not be in contact with the insulating oil. Since the oil-immersed transformer has relatively high requirements for the quality of the insulating oil, the arrangement and air inlet and outlet modes of the refrigeration pipe 11 in the present invention meet this requirement.

[0038] The oil conservator 4 is an additional component of the prior art of oil-immersed transformers. It is also filled with insulating oil inside, which plays the role of storing, supplementing, and detecting the oil level of the insulating oil in the oil-immersed transformer tank 1. When applied in the present invention, it also has the following auxiliary explosion-proof function: when the insulating oil in the oil-immersed transformer tank 1 enters the explosion-proof pipe 5 and the temperature sensor sends a signal to the controller, and the controller controls the fan 21 to start automatically, the controller will also control the oil pump 8 to start. The oil pump 8 supplies insulating oil to the pressure chamber 14 through the first pipeline 7. This part of the insulating oil will be mixed with the insulating oil that enters the pressure chamber 14 from the explosion-proof pipe 5. Since the insulating oil in the oil conservator 4 is far from the wire coil and iron core in the oil-immersed transformer tank 1, the temperature of the insulating oil in the oil conservator 4 is relatively low. When it is mixed with the insulating oil that enters the pressure chamber 14 from the explosion-proof pipe 5, it will quickly reduce the oil temperature. Then these two parts of insulating oil will enter the pressure chamber 14 and be cooled by the refrigeration pipe 11, and finally penetrate into the sponge filler 10, and then flow into the recovery pipe 12 through the second pipeline 13, and finally flow back into the oil-immersed transformer tank 1 through the recovery pipe 12 to exchange heat and cool down the insulating oil that is heating up in the oil-immersed transformer tank 1. The insulating oil from the oil conservator 4 also helps to accelerate the heat exchange efficiency and effectively supplement the insulating oil in the oil-immersed transformer tank 1. Under the action of the oil pump 8, the inlet oil pressure is greater than the supporting force of the thin spring 18 on the pressing plate 9. As the oil pressure in the pressure chamber 14 increases, the pressing plate 9 will also descend, and while descending, it will squeeze the sponge filler 10, slowly transporting the cooled insulating oil into the sponge filler 10 while using the squeezing method to discharge the insulating oil in the sponge filler 10 into the oil-immersed transformer tank 1 through the recovery pipe 12 for heat exchange and cooling.

[0039] As Figure 4 shown, the recovery pipe 12 is in a multi-segment wavy shape. The recovery pipe 12 surrounds the inside of the oil-immersed transformer tank 1 along the contour of the cavity wall of the oil-immersed transformer tank 1. The recovery pipe 12 is vertically immersed in the insulating oil from the bottom of the cavity of the oil-immersed transformer tank 1. A large number of oil discharge holes are arranged on the recovery pipe 12 along its wavy trend. Through these oil discharge holes, the recovered and cooled insulating oil is discharged into the oil-immersed transformer tank 1 from multiple directions, increasing the heat exchange area with the insulating oil in the oil-immersed transformer tank 1, improving the cooling speed of the oil-immersed transformer tank 1, and further enhancing the explosion-proof performance.

[0040] When the temperature in the oil-immersed transformer tank 1 returns to normal after the fault is eliminated and the insulating oil in the oil-immersed transformer tank 1 does not enter the explosion-proof pipe 5, the controller will not control the oil pump 8, fan 21, etc. to work. At this time, the recovery cylinder 6 does not return oil and does not pump oil from the inside of the recovery cylinder 6. The oil pressure on the pressure chamber 14 disappears, and the thin spring 18 resumes its length, pushing the pressing plate 9 to rise. The sponge filler 10 no longer compresses and discharges oil, and at the same time as the thin spring 18 resumes its length, it also rises upward.

[0041] As Figure 1 、 Figure 4As shown in the figure, a second heat sink 19 is fixed on the outer wall of the oil-immersed transformer tank 1. The tank wall of the oil-immersed transformer tank 1 is located between the second heat sink 19 and the refrigeration pipe 11. The second heat sink 19 is an original heat dissipation component on the transformer. The heat generated by the oil-immersed transformer tank 1 is directly dissipated through the second heat sink 19, and the refrigeration pipe 11 forms an internal and external temperature reduction effect therewith, improving the cooling efficiency of the oil-immersed transformer tank 1.

[0042] As Figure 1 As shown in the figure, a oil pipe 22 is connected between the oil conservator 4 and the oil-immersed transformer tank 1. An electromagnetic valve 23 is installed on the oil pipe 22, and the electromagnetic valve 23 is electrically connected to the controller. When the oil-immersed transformer tank 1 is normal (operating at low temperature), the electromagnetic valve 23 is in the open state, and the explosion-proof pipe 5 will not drain oil upward, and the controller will not control the oil pump 8, the fan 21, etc. to work. On the contrary, if the oil-immersed transformer tank 1 heats up due to a fault and the explosion-proof pipe 5 drains oil upward, in addition to controlling the oil pump 8 and the fan 21 to perform the above temperature reduction actions, the controller will also control the electromagnetic valve 23 to close, so as to avoid directly extracting high-temperature insulating oil from the oil-immersed transformer tank 1 through the recovery cylinder 6 when the oil pump 8 replenishes oil to the recovery cylinder 6, resulting in the loss of the temperature reduction effect.

[0043] The above orientation references do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the relative description is set with reference to the orientations in the figure. In fact, the specific orientations of the components are based on their actual installation, actual use, and the habitual orientation descriptions of those skilled in the art. This is hereby stated.

[0044] The above-described specific implementation manners have further elaborated on the invention purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only the specific implementation manners of the present invention and are not used to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A transformer, characterized in that, It includes an oil-immersed transformer tank (1), the oil-immersed transformer tank (1) is filled with insulating oil, a tank cover (3) is provided at the top of the oil-immersed transformer tank (1), an oil conservator (4) and an explosion-proof component (2) are installed on the tank cover (3), the explosion-proof component (2) includes a recovery cylinder (6) connected to the immersed transformer tank (1), a first pipeline (7) is connected between the top of the recovery cylinder (6) and the top of the oil conservator (4), the explosion-proof component (2) further includes an explosion-proof pipe (5) connected from the tank cover (3) to the inside of the oil-immersed transformer tank (1) and inserted into the insulating oil, the other end of the explosion-proof pipe (5) is connected to the recovery cylinder (6), a pressing plate (9) and a sponge filler (10) are provided in the recovery cylinder (6), the pressing plate (9) presses on the sponge filler (10), a refrigeration pipe (11) is also filled in the recovery cylinder (6), one ends of the first pipeline (7) and the explosion-proof pipe (5) connected to the recovery cylinder (6) are close to the refrigeration pipe (11), and a recovery pipe (12) is provided in the oil-immersed transformer tank (1), and a second pipeline (13) is connected between the recovery cylinder (6) and the recovery pipe (12).

2. The transformer according to claim 1, characterized in that, The recovery cylinder (6) is a straight cylinder vertically upward and is located at the bottom side of the oil conservator (4). A pressure cavity (14) is left between the top of the inner cavity of the recovery cylinder (6) and the top surface of the pressing plate (9). The refrigeration pipe (11) is filled in the pressure cavity (14). The refrigeration pipe (11) is composed of multiple spiral pipes stacked and combined from top to bottom. One spiral end of it penetrates from one side of the recovery cylinder (6) to outside the pressure cavity (14), and the other spiral end of it penetrates from the other side of the recovery cylinder (6) to outside the pressure cavity (14). The pressing plate (9) is provided with seepage holes (16). One end of the first pipeline (7) connected to the recovery cylinder (6) is located above the refrigeration pipe (11) and communicates with the spiral inner hole of the refrigeration pipe (11). One end of the explosion-proof pipe (5) connected to the recovery cylinder (6) is located above the refrigeration pipe (11) and communicates with the spiral inner hole of the refrigeration pipe (11). A bracket (20) is installed on the outside of the recovery cylinder (6), and a fan (21) is installed on the bracket (20). The air inlet of the fan (21) corresponds to the air inlets of all the refrigeration pipes (11).

3. A transformer according to claim 2, characterized in that, A grid-shaped first heat dissipation fin (17) is embedded in the spiral inner hole of the refrigeration pipe (11). One ends of the first pipeline (7) and the explosion-proof pipe (5) connected to the recovery cylinder (6) are located above the first heat dissipation fin (17).

4. A transformer according to claim 3, characterized in that, An oil pump (8) is provided on the first pipeline (7), a pressure control valve (15) is provided on the explosion-proof pipe (5), a controller electrically connected to the pressure control valve (15) is provided on the oil-immersed transformer tank (1), a pressure sensor electrically connected to the controller is further provided on the explosion-proof pipe (5), and the fan (21) and the oil pump (8) are electrically connected to the controller.

5. A transformer according to claim 4, characterized in that, The recovery pipe (12) is in a multi-segment wavy shape. The recovery pipe (12) surrounds inside the oil-immersed transformer tank (1) along the contour of the cavity wall of the oil-immersed transformer tank (1), and the recovery pipe (12) vertically immerses in the insulating oil upward from the bottom of the cavity of the oil-immersed transformer tank (1).

6. A transformer according to claim 5, characterized in that, A number of vertically upward thin springs (18) are filled in the sponge filler (10). The top ends of the thin springs (18) abut against the bottom surface of the pressing plate (9). When insulating oil is injected into the pressure cavity (14), through the supporting action of the thin springs (18), the pressing plate (9) is enabled to slowly descend along the cavity wall of the recovery cylinder (6).

7. A transformer according to claim 6, wherein A second heat sink (19) is fixed on the outer wall of the oil-immersed transformer tank (1), and the tank wall of the oil-immersed transformer tank (1) is located between the second heat sink (19) and the refrigeration pipe (11).

8. A transformer according to claim 7, characterized in that, A pipeline (22) is connected between the oil conservator (4) and the oil-immersed transformer tank (1). An electromagnetic valve (23) is installed on the pipeline (22), and the electromagnetic valve (23) is electrically connected to the controller.

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