An oil-immersed power transformer

Abstract

This invention relates to the field of transformer technology, specifically to an oil-immersed power transformer: comprising a tank, a cover, heat sinks, and a controller. An electromagnet is located in the center of the cover, and a float with an iron block is located below the electromagnet. A piston is fixedly connected to the bottom end of the float. An oil outlet is located at the bottom of the tank, and an oil pipe is fixedly connected to one end of the outlet. The oil pipe consists of an outer pipe and an inner pipe. One end of the inner pipe is connected to the oil outlet at the bottom of the tank, and one side of the inner pipe is connected to an oil pump. One end of the outer pipe is fixed to the outer wall of the bottom of the tank, and the end of the outer pipe furthest from the bottom of the tank is connected to a water tank. This invention, through the design of the inner and outer pipes and the use of sponge material, allows the oil in the tank to be cooled during flow while simultaneously filtering impurities, improving the oil's heat dissipation speed, reducing impurities in the oil, thereby improving the overall heat dissipation effect of the power transformer and extending the service life of the oil.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to an oil-immersed power transformer. Background Technology

[0002] Transformers are ubiquitous in daily life. A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. There are many types of transformers. Classified by cooling method, transformers can be divided into dry-type transformers and oil-immersed transformers. Among dry-type transformers, epoxy resin dry-type transformers are considered fire-resistant, not easily ignited, and even if they do catch fire, the spread is limited to a certain area, and they have good self-extinguishing capabilities. However, epoxy resin dry-type transformers are more expensive, difficult to degrade after disposal, and have poor environmental performance. Therefore, most transformers currently used in power grids and industrial and mining enterprises are oil-immersed transformers. These oil-immersed transformers are filled with mineral insulating oil and are cheaper than dry-type transformers.

[0003] Oil-immersed power transformers use oil as a medium to immerse the internal components, which not only improves insulation strength but also protects them from moisture corrosion. Oil has a high specific heat capacity and is commonly used as a coolant. The heat generated during transformer operation causes the oil near the core and windings to expand and rise. Through convection of the oil, the heat is dissipated through the radiator, ensuring the normal operation of the transformer.

[0004] Existing oil-immersed power transformers have heat sinks installed directly outside the oil tank. Since transformers are generally installed outdoors, the heat sinks may be corroded by acidic or alkaline rainwater, as well as other environmental factors that can cause them to break. This can affect the normal heat dissipation of the transformer, requiring regular replacement and increasing operating costs.

[0005] In view of this, in order to overcome the above-mentioned technical problems, the present invention designs an oil-immersed power transformer, which solves the above-mentioned technical problems. Summary of the Invention

[0006] The technical problem to be solved by this invention is that existing oil-immersed power transformers have heat sinks installed directly outside the oil tank. Transformers are generally installed in outdoor environments, which means that the heat sinks may be corroded by acidic or alkaline rainwater, as well as other environmental factors that can have a destructive effect on the heat sinks, thus affecting the normal heat dissipation of the transformer. Therefore, they need to be replaced regularly, which increases the operating cost.

[0007] This invention provides an oil-immersed power transformer, comprising a tank, a cover, heat sinks, and a controller. The heat sinks are mounted on one side of the tank, and a liquid level sensor is installed on the tank wall near the heat sinks. The cover is provided with a high-voltage bushing and a low-voltage bushing. An electromagnet is located in the middle of the cover and on the bottom side of the cover. Below the electromagnet is a float with an iron block attached, and a piston is fixedly connected to the bottom end of the float. A cylinder is located at the bottom of the tank, with one end fixedly connected to the bottom of the tank. An oil inlet is opened on the side wall of the cylinder away from the float, and the piston is located inside the cylinder, sealing the oil inlet. An oil outlet is opened on the bottom wall of the tank, aligned with the piston. An oil pipe is fixedly connected to the end of the oil outlet away from the piston, and the end of the oil pipe away from the bottom of the tank is connected to an oil pump. The output end of the oil pump passes through the tank wall and extends into the tank.

[0008] The oil pipe is divided into an outer pipe and an inner pipe. One end of the inner pipe is connected to the oil outlet at the bottom of the tank, and the side of the inner pipe away from the bottom of the tank is connected to the oil pump. One end of the outer pipe is fixed to the outer wall at the bottom of the tank, and the side of the outer pipe away from the bottom of the tank is connected to the water tank. The water tank is located on the side close to the high-pressure bushing and is fixed on the frame.

[0009] Preferably, the oil pump is equipped with a fan at the end away from the water tank, the fan is rotatably connected to a rotating shaft, and the rotating shaft is fixedly connected to the inside of the cover.

[0010] Preferably, the fan blades are made of sponge, which is fixedly attached to the surface of the fan blades.

[0011] Preferably, a vertical stop is provided on the side of the vertical column away from the oil outlet, and a needle is provided at the bottom of the vertical stop, the needle contacting the fan blades.

[0012] Preferably, the inner tube is made of rubber material, and one or more elastic ropes are provided on the outer wall of the inner tube near the oil outlet at the bottom of the box. When the elastic ropes are tightened, they bind the inner tube.

[0013] Preferably, the outer tube contains one or more shape memory metals, one end of which is fixedly connected to the inner wall of the outer tube, and the other end of which is fixedly connected to a metal piston; the inner wall of the outer tube has a water outlet, the metal piston is located in the water outlet, the water outlet and the piston are slidably sealed together, and the shape memory metals are staggered with the inner tube.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. The present invention provides an oil-immersed power transformer, which, through the design of inner and outer tubes, allows the oil in the tank to be cooled during the flow process, thereby improving the heat dissipation speed of the oil and thus improving the heat dissipation effect of the entire power transformer.

[0016] 2. The oil-immersed power transformer provided by the present invention uses the sponge material of the fan blades to absorb impurities in the oil during the oil flow process, thereby reducing impurities in the oil and improving the service life of the oil. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is the front view of the present invention;

[0019] Figure 2 This is an enlarged view of point A in the present invention;

[0020] Figure 3 This is a cross-sectional view of the oil pipe;

[0021] In the diagram: 1. Cover; 2. Heat sink; 3. Housing; 4. Low-pressure sleeve; 5. High-pressure sleeve; 6. Liquid level sensor; 7. Electromagnet; 8. Iron block; 9. Buoy; 10. Piston; 11. Cylinder; 12. Oil inlet; 13. Oil outlet; 14. Water tank; 15. Frame; 16. Oil pump; 17. Oil pipe; 18. Shaft; 19. Fan blade; 20. Stop block; 21. Needle; 171. Shape memory metal; 172. Elastic rope; 173. Inner tube; 174. Water outlet; 175. Metal piston; 176. Outer tube. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] This invention provides an oil-immersed power transformer, comprising a housing 3, a cover 1, a heat sink 2, and a controller. The heat sink 2 is mounted on one side of the housing 3. A liquid level sensor 6 is installed on the housing wall near the heat sink 2 inside the housing 3. A high-voltage bushing 5 and a low-voltage bushing 4 are provided on the cover 1. An electromagnet 7 is located in the middle of the cover 1, and the electromagnet 7 is located on the bottom side of the cover 1. Below the electromagnet 7 is a float 9 with an iron block 8 attached, and a piston 10 is fixedly connected to the bottom end of the float 9. A cylindrical body 11 is provided at the bottom of the housing 3. One end of the cylinder 11 is fixedly connected to the bottom of the box 3. An oil inlet 12 is opened on the side wall of the cylinder 11 away from the float 9. The piston 10 is located inside the cylinder 11 and closes the oil inlet 12. An oil outlet 13 is opened on the bottom wall of the box 3. The oil outlet 13 is aligned with the piston 10. An oil pipe 17 is fixedly connected to the end of the oil outlet 13 away from the piston 10. The end of the oil pipe 17 away from the bottom of the box 3 is connected to the oil pump 16. The output end of the oil pump 16 passes through the box wall of the box 3 and extends into the interior of the box 3.

[0024] The oil pipe 17 is divided into an outer pipe 176 and an inner pipe 173. One end of the inner pipe 173 is connected to the oil outlet 13 at the bottom of the housing 3, and the side of the inner pipe 173 away from the bottom of the housing 3 is connected to the oil pump 16. One end of the outer pipe 176 is fixed to the outer wall at the bottom of the housing 3, and the side of the outer pipe 176 away from the bottom of the housing is connected to the water tank 14. The water tank 14 is located on the side close to the high-pressure bushing 5 and is fixed on the frame 15.

[0025] After the oil-immersed power transformer has been operating for a period of time, the coils and other components inside the tank 3 continuously generate heat. This heat is transferred to the oil inside the tank 3, causing the oil temperature to rise and the oil inside the tank 3 to expand thermally. This causes the oil level inside the tank 3 to rise, which in turn moves the float 9 upward. At the same time as the oil level rises, the level sensor 6 activates, transmitting the signal of the rising oil level to the controller. The controller then energizes the electromagnet 7 in the middle of the cover 1. The float 9 continues to move upward under the influence of buoyancy and the attraction of the electromagnet 7. The upward movement of the float 9 also causes the piston 10 at the bottom of the float 9 to move upward. After the piston 10 moves upward, the oil inlet 12 at the bottom of the cylinder 11 opens, and the oil flows out into the inner tube 173 of the oil pipe 17. The outer tube 176 of the oil pipe 17 is connected to the water tank 14, and the water in the outer tube 176 cools the oil flowing out of the inner tube 173.

[0026] When the controller opens the electromagnet 7, the oil pump 16 on the wall of the control box 3 starts to work. The oil pump 16 draws the cooled oil from the inner tube 173 and inputs it back into the box 3, thereby achieving the effect of automatically cooling the oil in the box 3, thus improving the working efficiency of the power transformer and reducing the probability of the power transformer failing due to excessive temperature.

[0027] In the actual production process of this invention, the cooling time of the oil tank is reasonably set according to the size of the tank body 3. When the cooling time is reached, the electromagnet 7 stops working, the float 9 returns to its position to block the oil inlet 12, and the oil pump 16 continues to work to pump the remaining oil in the inner tube 173 into the tank body 3. At this time, the liquid level sensor 6 sends information to the controller again, and the controller controls the oil pump 16 to stop, ending the cooling process.

[0028] In one specific embodiment of the present invention, the oil pump 16 is provided with a fan 22 at the end away from the water tank 14. The fan 22 is rotatably connected to the rotating shaft 18, and the rotating shaft 18 is fixedly connected to the inside of the cover 1.

[0029] During the process of oil pump 16 drawing oil and sending it into tank 3, the oil flows out from the output end of oil pump 16 and impacts the fan 22 on the side of oil pump 16 away from water tank 14. The fan 22 rotates under the impact of the oil, and the oil is scattered during the rotation of the fan 22, thereby further improving the heat dissipation effect of the oil.

[0030] In one specific embodiment of the present invention, the fan blades 19 of the fan 22 are made of sponge, and the sponge is fixedly connected to the surface of the fan blades 19.

[0031] While the oil impacts the fan 22, the sponge on the fan blades 19 of the fan 22 also absorbs the oil and impurities in the oil, thereby achieving the effect of filtering impurities in the oil and improving the service life of the oil.

[0032] In one specific embodiment of the present invention, a vertical stop block 20 is provided on the side of the vertical column away from the oil outlet 13, and a needle 21 is provided at the bottom of the vertical stop block 20, and the needle 21 contacts the fan blade 19 of the fan 22.

[0033] After the sponge on the fan blade 19 absorbs oil and impurities in the oil, the fan 22 rotates under the impact of the oil, and the sponge also rotates. During the rotation, the sponge on the fan blade 19 continuously contacts the baffle 20, achieving the effect of the baffle 20 agitating the sponge and squeezing out the oil absorbed in the sponge. At the same time, the needles 21 on the baffle 20 continuously pierce the sponge, increasing the roughness of the sponge, thereby improving the sponge's ability to absorb impurities and further improving the service life of the oil.

[0034] In one specific embodiment of the present invention, the inner tube 173 is made of rubber material, and one or more elastic ropes 172 are provided on the outer wall of the inner tube 173 near the oil outlet 13 at the bottom of the box 3. When the elastic ropes 172 are tightened, they bind the inner tube 173.

[0035] The inner tube 173 is tightened by the elastic rope 172. The elastic rope 172 binds the inner tube 173, but does not completely tighten it. The inner tube 173 is in a partially tightened state. When oil flows into the inner tube 173 from the oil inlet 12, the amount of oil in the inner tube between the two elastic ropes 172 gradually increases. The oil in the inner tube 173 causes the binding opening to gradually expand and then completely pass through, increasing the contact time between the oil in the inner tube 173 and the water in the outer tube 176, improving the cooling effect of the oil, thereby further improving the overall heat dissipation effect. After the cooling is completed, the binding opening returns to its original state for the next use.

[0036] In one specific embodiment of the present invention, one or more shape memory metals 171 are provided inside the outer tube 176. One end of the shape memory metal 171 is fixedly connected to the inner wall of the outer tube 176, and the other end of the shape memory metal 171 is fixedly connected to a metal piston 175. A water outlet 174 is opened on the inner wall of the outer tube 176, and the metal piston 175 is located in the water outlet 174. The water outlet 174 and the metal piston 175 are slidably sealed together. The shape memory metal 171 is staggered with the inner tube 173.

[0037] After a period of heat dissipation, the water in the outer tube 176 continuously exchanges heat with the oil in the inner tube 173, causing its temperature to rise. The shape memory metal 171 in the outer tube 176 deforms upon heating, pushing open the metal piston 175 and causing the water in the outer tube 176 to leak out and flow into the external environment. At the same time, the water in the water tank 14 replenishes the water in the outer tube 176, lowering its temperature and improving the heat dissipation effect on the oil in the inner tube 173. The shape memory metal 171 returns to its original shape when no longer heated, pulling the metal piston 175 back and ending the water leakage from the outer tube 176, further improving the cooling effect of the oil in the inner tube 173. Furthermore, the leaked water disperses into the environment where the power transformer is located, cooling the environment and further improving the overall heat dissipation effect of the power transformer.

[0038] This invention, through the design of inner and outer tubes and the use of sponge material, allows the oil in the tank to be cooled during the flow process, while filtering impurities in the oil, thereby improving the heat dissipation speed of the oil, reducing impurities in the oil, and thus improving the heat dissipation effect of the entire power transformer and extending the service life of the oil.

[0039] The specific workflow is as follows:

[0040] After the oil-immersed power transformer has been operating for a period of time, the coils and other components inside the tank 3 continuously generate heat. This heat is transferred to the oil inside the tank 3, causing the oil temperature to rise and the oil inside the tank 3 to expand thermally. This causes the oil level inside the tank 3 to rise, which in turn moves the float 9 upward. At the same time as the oil level rises, the level sensor 6 activates, transmitting the signal of the rising oil level to the controller. The controller then energizes the electromagnet 7 in the middle of the cover 1. The float 9 continues to move upward under the influence of buoyancy and the attraction of the electromagnet 7. The upward movement of the float 9 also causes the piston 10 at the bottom of the float 9 to move upward. After the piston 10 moves upward, the oil inlet 12 at the bottom of the cylinder 11 opens, and the oil flows out into the inner tube 173 of the oil pipe 17. The outer tube 176 of the oil pipe 17 is connected to the water tank 14, and the water in the outer tube 176 cools the oil flowing out of the inner tube 173.

[0041] While the controller controls the electromagnet 7 to open, it also controls the oil pump 16 on the wall of the housing 3 to start working. The oil pump 16 draws the cooled oil from the inner tube 173 and inputs it back into the housing 3, achieving the effect of automatically cooling the oil in the housing 3.

[0042] During the process of oil pump 16 drawing oil into tank 3, the oil flows out from the output end of oil pump 16 and impacts the fan 22 on the side of oil pump 16 away from water tank 14. The fan 22 rotates under the impact of the oil, and the rotation of the fan 22 disperses the oil, thereby further improving the heat dissipation effect of the oil. At the same time as the oil impacts the fan 22, the sponge on the fan blade 19 of the fan 22 also absorbs the oil and impurities in the oil, thereby achieving the effect of filtering impurities in the oil. After the sponge on the fan blade 19 absorbs the oil and impurities in the oil, under the impact of the oil, the fan 22 rotates, and the sponge also rotates with it. During the rotation, the sponge on the fan blade 19 continuously contacts the baffle 20, achieving the effect of the baffle 20 agitating the sponge, causing the oil absorbed in the sponge to be squeezed out; at the same time, the needles 21 on the baffle 20 continuously pierce the sponge, increasing the roughness of the sponge, thereby improving the sponge's ability to absorb impurities, and further improving the service life of the oil.

[0043] The inner tube 173 is tightened by the elastic rope 172. The elastic rope 172 binds the inner tube 173, but does not completely tighten it. The inner tube 173 is in a partially tightened state. When oil flows into the inner tube 173 from the oil inlet 12, the amount of oil in the inner tube between the two elastic ropes 172 gradually increases. The oil in the inner tube 173 causes the binding opening to gradually expand and then completely pass through, increasing the contact time between the oil in the inner tube 173 and the water in the outer tube 176, improving the cooling effect of the oil, thereby further improving the overall heat dissipation effect. After the cooling is completed, the binding opening returns to its original state for the next use.

[0044] After a period of heat dissipation, the water in the outer tube 176 continuously exchanges heat with the oil in the inner tube 173, causing its temperature to rise. The shape memory metal 171 in the outer tube 176 deforms upon heating, pushing open the metal piston 175 and causing the water in the outer tube 176 to leak out and flow into the external environment. At the same time, the water in the water tank 14 replenishes the water in the outer tube 176, lowering its temperature and improving the heat dissipation effect on the oil in the inner tube 173. The shape memory metal 171 returns to its original shape when no longer heated, pulling the metal piston 175 back and ending the water leakage from the outer tube 176, further improving the cooling effect of the oil in the inner tube 173. Furthermore, the leaked water disperses into the environment where the power transformer is located, cooling the environment and further improving the overall heat dissipation effect of the power transformer.

[0045] In this invention, the water in the water tank 14 can come not only from the water supply pipe, but also from rainwater accumulation.

[0046] The foregoing has shown and described 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 embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil-immersed power transformer, characterized by: The utility model relates to a kind of cooling device, including box (3), cover (1), fin (2) and controller, the fin (2) is assembled in the side of box (3), liquid level sensor (6) is equipped on the tank wall of box (3) near fin (2) in the box (3);High voltage bushing (5) and low voltage bushing (4) are equipped on the cover (1);The middle part of cover (1) is equipped with electromagnet (7), the electromagnet (7) is equipped in the bottom side of cover (1), the lower side of electromagnet (7) is equipped with float (9) with iron block (8), the bottom end of float (9) is fixedly connected with piston (10);The bottom of box (3) is equipped with cylinder (11), one end of cylinder (11) is fixedly connected with the bottom of box (3), the side wall of one end of cylinder (11) is opened in the box (3) and is away from the oil outlet (12) of float (9), the piston (10) is located in cylinder (11), and oil outlet (12) is closed;Tank wall of the bottom of box (3) is opened and is equipped with oil outlet (13), the oil outlet (13) is aligned with piston (10), the oil outlet (13) is fixedly connected with oil pipe (17) in the end away from piston (10), the end of oil pipe (17) away from the bottom of box (3) is connected with oil pump (16), the output end of oil pump (16) passes through the tank wall of box (3), and extends to the inside of box (3);Oil pipe (17) is divided into outer tube (176) and inner tube (173), one end of inner tube (173) is connected with the oil outlet (13) of the bottom of box (3), and the side of inner tube (173) away from the bottom of box (3) is connected with oil pump (16);The outer tube (176) one end is fixed with the outer wall of the bottom of box (3), and the end of outer tube (176) away from the bottom is communicated with water tank (14), and the water tank (14) is equipped in the side close to high voltage bushing (5), and the water tank (14) is fixed on rack (15); The end of oil pump (16) away from water tank (14) is equipped with fan (22), and fan (22) is rotatably connected on rotating shaft (18), and rotating shaft (18) is fixedly connected in the inside of cover (1); The side of fan (22) away from the output end of oil pump (16) is equipped with vertical stopper (20), and the bottom of vertical stopper (20) is equipped with needle (21), and needle (21) is in contact with fan blade (19) of fan (22).

2. An oil immersed power transformer according to claim 1, characterized in that: Sponge is fixedly connected on the surface of fan blade (19).

3. An oil immersed power transformer according to claim 1, characterized in that: The inner tube (173) is made of rubber material, and more than one elastic rope (172) is equipped on the outer wall of the inner tube (173) close to the oil outlet (13) of the bottom of box (3), and the elastic rope (172) is tightened when bundling inner tube (173).

4. An oil immersed power transformer according to claim 1, characterized in that: The outer tube (176) is internally provided with one or more memory metals (171), one end of the memory metal (171) is fixedly connected with the inner wall of the outer tube (176), the other end of the memory metal (171) is fixedly connected with a metal piston (175); the inner wall of the outer tube (176) is provided with a water outlet (174), the metal piston (175) is located in the water outlet (174), the water outlet (174) is in sliding sealing connection with the piston (10), and the memory metal (171) is arranged in dislocation with the inner tube (173).

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