An oil-immersed transformer

Abstract

The present invention relates to the field of transformer technology, and in particular to an oil-immersed transformer, comprising: an oil tank, a transformer body fixedly mounted in the oil tank, a detection mechanism for detecting temperature changes in the transformer, and a cooling mechanism for cooling the transformer. The oil-immersed transformer of the present invention is provided with a cooling mechanism, which can achieve the cooling demand for the oil in the oil tank during normal operation of the oil-immersed transformer by relying solely on the structural design of the heat dissipation pipe itself and its heat exchange capacity with the external environment, without relying on any external power or additional cooling equipment; at the same time, when the transformer is under high load or the air is hot, when the temperature in the oil tank reaches a preset temperature, the flow of liquid in the heat dissipation pipe is strengthened, thereby improving the heat dissipation effect and preventing damage to the transformer caused by a continuous increase in temperature.

Description

Technical Field

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

[0002] An oil-immersed transformer, also known as an oil-immersed test transformer, is a transformer that uses oil cooling to reduce transformer temperature. It converts high voltage to low / medium voltage levels suitable for transmission to homes and businesses. It is widely used in power systems, industrial and mining enterprises, transportation, commercial and residential buildings, and other fields.

[0003] Patent application number CN202411203453.4 discloses an oil-immersed transformer that is easy to adjust the temperature, including an oil tank, an iron core, a winding, a heat dissipation pipe, an impeller, an adjusting assembly, a guide vane, a drainage assembly and a diverter plate; the heat dissipation pipe array is on the oil tank, and the heat dissipation pipe is divided into a fixed heat dissipation pipe and a swinging heat dissipation pipe. The impeller is located in the oil tank and is rotatably installed with the oil tank; an adjusting assembly is provided below the impeller, and a guide vane is provided in front of the adjusting assembly. When the temperature in the oil tank rises, the fixed heat dissipation pipe drives the impeller to rotate through the oil, and the impeller drives the guide vane and the swinging heat dissipation pipe to swing left and right through the adjusting assembly; the drainage assembly is located on both sides of the adjusting assembly, and a diverter plate is provided at the top of the oil tank. When the guide vane swings left and right, the adjusting assembly pushes the diverter plate to slide horizontally through the drainage assembly. The present invention achieves uniform distribution of oil in the oil tank through reciprocating motion, thereby improving the heat dissipation efficiency and ensuring the uniformity of horizontal temperature in the oil tank.

[0004] This application achieves the circulation of oil in the oil tank by setting up a heat dissipation pipe. However, when the oil-immersed transformer is working at full load, it is difficult to quickly cool down the oil in the oil tank by relying on the natural flow of liquid in the heat dissipation pipe, resulting in increased oil pressure in the transformer. In addition, the setting of the swinging heat dissipation pipe may also increase the potential risk of oil leakage in the device, posing a challenge to the sealing performance of the device, thereby significantly reducing the overall reliability and safety.

[0005] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the Invention

[0006] The object of the present invention is to provide an oil-immersed transformer that can effectively solve the above technical problems.

[0007] In order to achieve the purpose of the present invention, the following technical solutions are adopted:

[0008] An oil-immersed transformer comprises: an oil tank, a transformer body fixedly mounted in the oil tank, a detection mechanism for detecting temperature changes in the transformer, and a cooling mechanism for cooling the transformer;

[0009] The cooling mechanism includes: an autonomous cooling component for self-active cooling and a forced air cooling component for accelerated cooling;

[0010] The autonomous cooling component includes: a heat dissipation pipe fixedly mounted on the fuel tank, and heat dissipation fins fixedly mounted on the heat dissipation pipe; the heat dissipation pipe is provided with an oil inlet and an oil outlet, the oil inlet is located at the upper end of the fuel tank, and the oil outlet is located at the lower end of the fuel tank; the heat dissipation pipe is divided into a hard pipe section and a soft pipe section;

[0011] The forced air cooling component includes: a fan for cooling the heat dissipation fins, a motor for driving the fan to rotate; and a speed increasing unit for increasing the flow of oil in the heat dissipation pipe.

[0012] Furthermore, the speed increasing unit includes: an extrusion tank fixedly connected to the hard pipe section, a hose end surrounding the inner wall of the extrusion tank, a supporting plate rotatably mounted on the side wall of the extrusion tank, and a plurality of extrusion rollers arranged along the circumferential direction on the supporting plate; the supporting plate is coaxially fixedly connected to the motor through a connecting rod.

[0013] Furthermore, the cooling mechanism further comprises: a rapid cooling component for rapidly cooling the transformer when it is abnormal;

[0014] The rapid cooling component includes: an oil pillow fixedly installed on the oil tank, an oil extraction port and an oil discharge port opened on the oil pillow, an impeller rotatably installed at the oil extraction port, and a mixing component that mixes the oil in the oil tank as the impeller rotates; the oil extraction port of the oil pillow and the oil outlet of the heat dissipation pipe are linked by a pipe fitting; the oil discharge port is connected to the oil tank through a pipe fitting; and a three-way valve is provided on the oil extraction port and the oil outlet of the heat dissipation pipe.

[0015] Furthermore, the mixing assembly includes: a cam fixedly connected to the impeller coaxially; a hinged rod rotatably connected to the cam at an eccentric point, and a mixing plate rotatably connected to the other end of the hinged rod; the mixing plate is limited by a limiting groove and the inner wall of the oil pillow.

[0016] Furthermore, the detection mechanism includes: a first detection component and a second detection component;

[0017] The first detection assembly includes: a detection seat fixedly installed on the oil tank, a pressure plate slidably installed in the detection seat, and a sensing plate elastically connected to the pressure plate through a spring; the sensing plate is fixedly installed in the detection seat; and the detection seat is connected to the oil tank.

[0018] Furthermore, the second detection component includes: a mercury chamber fixedly mounted on the sensor plate, mercury stored in the mercury chamber, a charged positive electrode inserted into the mercury chamber, a port opened on the mercury chamber, a wire fixedly mounted at the port, an electrically controlled three-way valve electrically connected to the wire, and a pressure relief component for relieving the oil pressure in the fuel tank; the wire is connected to the negative electrode.

[0019] Furthermore, the pressure relief assembly includes: an exhaust pipe passing through the detection seat, a sealing cover for sealing the exhaust pipe, a magnetic part fixedly mounted on the sealing cover, and an electromagnet electrically connected to the wire; the magnetic poles of the electromagnet and the magnetic part repel each other; the sealing cover and the detection seat are elastically connected by spring 2; and the exhaust pipe is connected to the oil tank.

[0020] Furthermore, the mercury chamber is divided into a storage chamber and an expansion chamber, the positive electrode is connected to the storage box, and the negative electrode is connected to the expansion chamber through a wire.

[0021] Compared with the prior art, the present invention has the following beneficial effects: an oil-immersed transformer of the present invention is provided with a cooling mechanism, which can achieve, when the oil-immersed transformer is working normally, the cooling demand for the oil in the oil tank can be met solely by the structural design of the heat dissipation pipe itself and its heat exchange capacity with the external environment, without relying on any external power or additional cooling equipment; at the same time, when the transformer is highly loaded or the air is hot, when the temperature in the oil tank reaches a preset temperature, the flow of liquid in the heat dissipation pipe is strengthened, thereby improving the heat dissipation effect and preventing damage to the transformer caused by continuous temperature increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0023] Figure 1 This is a structural schematic diagram of an oil-immersed transformer according to the present invention;

[0024] Figure 2 This is a front view of an oil-immersed transformer according to the present invention;

[0025] Figure 3 Schematic diagram of the structure of the cooling mechanism in the present invention;

[0026] Figure 4 is a cross-sectional view of the cooling mechanism of the present invention;

[0027] Figure 5 Schematic diagram of the structure of the oil pillow in the present invention;

[0028] Figure 6 This is an internal cross-sectional view of the oil pillow of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the detection mechanism in the present invention.

[0030] In the figure: 1, oil tank; 2, transformer body; 3, detection mechanism; 4, cooling mechanism; 411, heat pipe; 412, heat fin; 413, oil inlet; 414, oil outlet; 4111, hard pipe section; 4112, hose section; 421, fan; 422, motor; 423, speed increasing unit; 4231, liquid extrusion tank; 4233, carrier plate; 4234, extrusion roller; 4235, connecting rod; 431, oil pillow; 432, oil extraction port; 433, oil discharge port; 4 34. Impeller; 4351. Cam; 4352. Articulated rod; 4353. Mixing plate; 311. Detection seat; 312. Pressure plate; 313. Spring 1; 314. Sensing plate; 321. Mercury chamber; 322. Positive electrode; 323. Port; 324. Wire; 326. Pressure relief assembly; 3261. Exhaust pipe; 3262. Sealing cover; 3263. Magnetic part; 3264. Electromagnet; 3265. Spring 2; 3211. Storage chamber; 3212. Expansion chamber. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0032] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like 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 cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0033] like Figures 1 to 7As shown, the present invention provides an oil-immersed transformer, comprising: an oil tank 1, a transformer body 2 fixedly mounted in the oil tank 1, a detection mechanism 3 for detecting temperature changes in the transformer, and a cooling mechanism 4 for cooling the transformer;

[0034] When in use, the detection mechanism 3 can monitor the temperature and air pressure inside the transformer oil tank 1 at all times, so as to understand the working environment of the transformer body 2 in real time, and can judge the working status of the transformer body 2 in real time according to the working condition of the transformer body 2, and then make corresponding countermeasures. The cooling mechanism 4 can perform graded cooling in response to normal working conditions, load working conditions, and abnormal working conditions to achieve optimized cooling efficiency and realize energy-saving operation.

[0035] The detection mechanism 3 includes: a first detection component and a second detection component;

[0036] The first detection assembly includes: a detection seat 311 fixedly mounted on the fuel tank 1, a pressure plate 312 slidably mounted in the detection seat 311, and a sensing plate 314 elastically connected to the pressure plate 312 via a spring 313; the sensing plate 314 is fixedly mounted in the detection seat 311; the detection seat 311 is in communication with the interior of the fuel tank 1;

[0037] As known from the prior art, the higher the temperature in the fuel tank 1, the greater the pressure in the fuel tank 1. When the temperature in the fuel tank 1 gradually increases, the pressure in the fuel tank 1 gradually increases, and the pressure plate 312 slides along the inner cavity of the detection seat 311 as the pressure in the fuel tank 1 increases. When the pressure in the fuel tank 1 exceeds the normal operating range, the pressure plate 312 overcomes the elasticity of the spring 1 313 and abuts against the contact plate. The sensing element on the pressure plate 312 contacts the contact switch on the sensing plate 314, making them open, indicating that the current working state in the fuel tank 1 is high load. At this time, the engine body begins to be forced to cool down.

[0038] The second detection assembly includes: a mercury chamber 321 fixedly mounted on the sensing plate 314, mercury stored in the mercury chamber 321, a charged positive electrode 322 inserted into the mercury chamber 321, a port 323 provided on the mercury chamber 321, a wire 324 fixedly mounted at the port 323, an electrically controlled three-way valve connected to the wire 324, and a pressure relief assembly 326 for relieving the oil pressure in the oil tank 1; the wire 324 is connected to the negative electrode.

[0039] The mercury chamber 321 is divided into a storage chamber 3211 and an expansion chamber 3212 . The positive electrode 322 is connected to the storage chamber 3211 , and the negative electrode is connected to the expansion chamber 3212 via a wire 324 .

[0040] If the temperature of the oil in the oil tank 1 gradually decreases under the cooling mechanism 4, the pressure in the oil tank 1 gradually decreases, the pressure on the pressure plate 312 decreases, and the pressure plate 312 is gradually reset by the elastic force of the spring 313, which proves that the working state of the oil tank 1 is normal. If the cooling mechanism 4 continues to cool down and the pressure plate 312 is always in contact with the sensing plate 314, it proves that the pressure in the oil tank 1 does not have a good cooling effect under the cooling mechanism 4, which may be an abnormality caused by mechanical failure or oil deterioration.

[0041] When pressure plate 312 remains in close contact with sensing plate 314, the insulation between them loses effectiveness. Heat within fuel tank 1 is transferred directly to mercury chamber 321 on sensing plate 314 via heat conduction, causing the mercury to expand. As the mercury expands, it contacts the pre-set wire 324, completing the electrical circuit. At this point, the electrically controlled three-way valve activates, changing its operating state and adjusting the oil flow path. Specifically, the oil within fuel tank 1 ceases its original self-circulating cooling process. Instead, the oil within tank 1 is filled into the oil pillow 431, and the cool oil within the oil pillow 431 is then filled into fuel tank 1, achieving more efficient cooling. Simultaneously, as the electrical circuit is formed, the system sends an abnormality alarm to the maintenance center, prompting personnel to promptly perform equipment maintenance. By replenishing cool oil within the oil pillow 431, the risk of cylinder explosion caused by overheating in fuel tank 1 is effectively avoided.

[0042] The pressure relief assembly 326 includes: an exhaust pipe 3261 passing through the detection seat 311, a sealing cover 3262 for sealing the exhaust pipe 3261, a magnetic part 3263 fixedly mounted on the sealing cover 3262, and an electromagnet 3264 electrically connected to the wire 324; the magnetic poles of the electromagnet 3264 and the magnetic part 3263 repel each other; the sealing cover 3262 and the detection seat 311 are elastically connected by a spring 2 3265; the exhaust pipe 3261 is connected to the oil tank 1.

[0043] When the oil pressure inside fuel tank 1 exceeds the limit, the pressure inside exhaust pipe 3261 increases. This pressure overcomes the elastic force of spring 2 3265, pushing sealing cover 3262 upward to achieve pressure relief. After pressure relief is complete, spring 2 3265 automatically resets sealing cover 3262, forming the device's automatic overload protection mechanism. However, if a fault occurs inside fuel tank 1, causing a rapid temperature rise, relying on this method for pressure relief may be inefficient and can easily lead to a rapid buildup of internal pressure.

[0044] In view of this, when the temperature of the fuel tank 1 continues to rise, the mercury expands due to thermal expansion and triggers the circuit to conduct. At this time, the electromagnet 3264 is energized and generates a magnetic force that repels the magnetic part 3263, forcing the sealing cover 3262 to quickly move away from the exhaust pipe 3261, thereby accelerating the release of the air pressure inside the fuel tank 1 and effectively preventing equipment damage caused by excessive air pressure.

[0045] It should be emphasized here that the staff can adjust the distance between the wire 324 and the mercury level at will, so that according to the real-time demand of the transformer, the alarm starts when the oil tank 1 reaches the specified level, thereby realizing the convenience of the device;

[0046] By setting up the second detection component, on the one hand, after cooling the oil in the oil tank 1, if the oil temperature still does not drop, information can be obtained, thereby starting the rapid cooling component to quickly cool the oil tank 1 and notifying the staff for maintenance. On the other hand, the high-pressure gas in the oil tank 1 can be quickly discharged.

[0047] The cooling mechanism 4 includes: an autonomous cooling component for self-active cooling and a forced air cooling component for accelerated cooling;

[0048] The autonomous cooling assembly includes: a heat dissipation pipe 411 fixedly mounted on the fuel tank 1, and heat dissipation fins 412 fixedly mounted on the heat dissipation pipe 411; the heat dissipation pipe 411 is provided with an oil inlet 413 and an oil outlet 414, the oil inlet 413 being located at the upper end of the fuel tank 1, and the oil outlet 414 being located at the lower end of the fuel tank 1; the heat dissipation pipe 411 is divided into a hard pipe section 4111 and a soft pipe section 4112;

[0049] The oil enters the heat dissipation pipe 411 from the upper end of the oil tank 1 through the oil inlet 413, and flows downward under the action of gravity and flows out from the oil outlet 414 into the oil tank 1, forming a circulation flow. When the oil flows in the heat dissipation pipe 411, the heat dissipation pipe 411 exchanges heat with the outside air, thereby reducing the temperature of the oil. In particular, when the power system is in a low-load state or the ambient temperature is low, the oil temperature inside the oil tank 1 will not rise to an excessively high level. At this time, the cooling demand for the oil in the oil tank 1 can be met solely by the structural design of the heat dissipation pipe 411 itself and its heat exchange capacity with the external environment, without relying on any external power or additional cooling equipment. The heat dissipation area of ​​the heat dissipation pipe 411 is then increased by the heat dissipation fins 412, resulting in a better heat dissipation effect. This natural cooling method does not consume any additional energy, thereby significantly reducing the energy loss of the entire cooling system and improving the overall energy efficiency of the power system.

[0050] The forced air cooling assembly includes: a fan 421 for cooling the heat dissipation fins 412, a motor 422 for driving the fan 421 to rotate; and a speed increasing unit 423 for increasing the flow of oil in the heat dissipation pipe 411.

[0051] The speed increasing unit 423 includes: an extrusion groove 4231 fixedly connected to the hard pipe section 4111, a hose end surrounding the inner wall of the extrusion groove 4231, a supporting plate 4233 rotatably mounted on the side wall of the extrusion groove 4231, and a plurality of squeezing rollers 4234 arranged along the circumferential direction on the supporting plate 4233; the supporting plate 4233 is coaxially fixedly connected to the motor 422 through a connecting rod 4235.

[0052] When the transformer is under high load or the air is hot, when the temperature in the oil tank 1 reaches a preset temperature, the motor 422 drives the fan 421 to rotate at high speed, generating a strong airflow that blows directly toward the heat dissipation fins 412; the heat dissipation fins 412 increase the heat dissipation area of ​​the heat dissipation pipe 411, allowing more heat to be quickly dissipated into the air; and the heat exchange efficiency between the heat dissipation fins 412 and the outside air is improved, thereby accelerating the cooling speed of the oil.

[0053] At the same time, when the motor 422 rotates, it will also drive the supporting plate 4233 to rotate. The squeezing roller 4234 on the supporting plate 4233 rotates circumferentially with the supporting plate 4233. When the squeezing roller 4234 rotates, it is in close contact with the hose end on the inner wall of the extrusion groove 4231. As the supporting plate 4233 rotates, the squeezing roller 4234 continuously squeezes and releases the hose section 4112. This periodic squeezing action causes the oil in the heat dissipation pipe 411 to be subjected to additional pressure fluctuations, forming a force inside the hose that promotes the flow of oil. This force is combined with the gravity of the oil itself to enhance the circulation effect of the oil in the heat dissipation pipe 411. As a result, the fluidity of the oil in the oil tank 1 is enhanced, and at the same time, the oil in the heat dissipation pipe 411 is cooled well when it flows to the heat dissipation pipe 411.

[0054] Moreover, the above structure does not add any additional interfaces, and does not set up any additional transmission mechanism in the oil tank 1; the sealing performance of the device is greatly enhanced, and at the same time, the speed increasing unit 423 is set on the outside of the oil tank 1, making it more convenient to inspect and maintain the device.

[0055] The cooling mechanism 4 further includes: a rapid cooling component for rapidly cooling the transformer when it is abnormal;

[0056] The rapid cooling assembly includes: an oil pillow 431 fixedly mounted on the oil tank 1, an oil extraction port 432 and an oil discharge port 433 provided on the oil pillow 431, an impeller 434 rotatably mounted at the oil extraction port 432, and a mixing assembly for mixing the oil in the oil tank 1 as the impeller 434 rotates; the oil extraction port 432 of the oil pillow 431 is linked to the oil outlet 414 of the heat dissipation pipe 411 via a pipe fitting; the oil discharge port 433 is connected to the oil tank 1 via a pipe fitting; and three-way valves are provided on the oil extraction port 432 and the oil outlet 414 of the heat dissipation pipe 411.

[0057] When the transformer is at a continuously high temperature, the oil flow channel is switched by the electronically controlled three-way valve, so that the hot oil at the upper end of the oil tank 1 is extracted into the heat dissipation pipe 411 through the squeezing roller 4234, and then transported to the oil pillow 431 through the squeezing roller 4234 for heat exchange, and the cool oil originally stored in the oil pillow 431 is transported to the oil tank 1 for efficient cooling.

[0058] The mixing mechanism includes: a cam 4351 coaxially fixedly connected to the impeller 434; a hinged rod 4352 rotatably connected to the cam 4351 at an eccentric position; and a mixing plate 4353 rotatably connected to the other end of the hinged rod 4352; the mixing plate 4353 is limited in position by a limiting groove and the inner wall of the oil pillow 431;

[0059] In the process of using the squeezing roller 4234 to extract the high-temperature oil in the oil tank 1 to the oil pillow 431, the impeller 434 is driven to rotate. It should be added that a cooling fin is integrated on one side of the oil pillow 431, wherein the cold surface of the cooling fin is tightly fitted to the wall of the oil pillow 431. The impeller 434 not only promotes the gentle and rapid heat mixing of the hot oil pumped into the oil pillow 431 and the original cold oil, but also links the mixing plate 4353 through a hinge mechanism to perform horizontal displacement inside the oil pillow 431 to further accelerate the hot and cold neutralization process of the oil. Subsequently, under the cooling effect of the cooling fin, the hot oil is rapidly cooled. This design makes it possible to effectively complete the heat exchange task of the oil in the oil tank 1 without pre-storing a large amount of oil in the oil pillow 431.

[0060] Furthermore, a speed sensor is crucially located on the side of impeller 434. As impurities in the oil increase, the resistance to impeller 434's rotation increases, causing the speed to drop. By monitoring the speed of impeller 434 in real time, the speed sensor provides crucial information during equipment maintenance checks, confirming whether the temperature rise within tank 1 is due to oil deterioration. This significantly improves troubleshooting and repair efficiency.

[0061] Working principle: When the oil-immersed transformer is working, the detection mechanism 3 monitors the working environment inside the oil tank 1 in real time. When the temperature inside the oil tank 1 is within the normal working range of the transformer, the air pressure inside the oil tank 1 is insufficient to squeeze the pressure plate 312 into contact with the sensing plate 314; at this time, the oil enters the heat dissipation pipe 411 from the upper end of the oil tank 1 through the oil inlet 413, and flows downward under the action of gravity and flows out from the oil outlet 414 into the oil tank 1, forming a circulation flow. The structural design of the heat dissipation pipe 411 itself and its heat exchange capacity with the external environment can meet the cooling demand for the oil in the oil tank 1; thereby significantly reducing the energy loss of the entire cooling system and improving the overall energy efficiency of the power system.

[0062] When the temperature in the oil tank 1 is within the abnormal operating range of the transformer, the air pressure in the oil tank 1 increases, squeezing the pressure plate 312 to contact the induction plate 314; through the contact between the pressure plate and the induction plate 314, the induction element on the pressure plate 312 contacts the contact switch on the induction plate 314 to make it pass through. At this time, the motor 422 is energized, driving the fan 421 and the squeezing roller 4234 to rotate, so that the high-temperature oil in the oil tank 1 flows rapidly. When flowing through the heat dissipation pipe 411, the fan 421 cools it synchronously and rapidly, thereby achieving the purpose of cooling the temperature in the oil tank 1.

[0063] If, after the forced air cooling assembly is activated, the pressure plate 312 remains in contact with the induction plate 314, the temperature inside the oil tank 1 continues to rise, significantly exceeding the temperature of the transformer body 2 caused by excessive load. This indicates an unidentified fault in the transformer body 2. Consequently, when the pressure plate 312 remains in contact with the induction plate 314, the insulation between them fails, and heat from the oil tank 1 is directly transferred to the mercury chamber 321 on the pressure plate via heat conduction, causing the mercury to expand. As the mercury continues to expand, it contacts the pre-set wire 324, completing the electrical circuit. At this point, the electrically controlled three-way valve is activated, changing its operating state and adjusting the oil flow path. The hot oil at the upper end of the oil tank 1 is extracted into the heat dissipation pipe 411 through the squeezing roller 4234, and then transported to the oil pillow 431 through the squeezing roller 4234 for heat exchange. The cold oil originally stored in the oil pillow 431 is transported to the oil tank 1 for efficient cooling. When the electrical circuit is formed, the system will send an abnormal alarm signal to the maintenance center, prompting the staff to carry out equipment maintenance in time.

[0064] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology. It will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0065] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. An oil-immersed transformer, characterized in that: include: An oil tank, a transformer body fixedly mounted in the oil tank, a detection mechanism for detecting temperature changes in the transformer, and a cooling mechanism for cooling the transformer; The cooling mechanism includes: an autonomous cooling component for self-active cooling and a forced air cooling component for accelerated cooling; The autonomous cooling component includes: a heat dissipation pipe fixedly mounted on the fuel tank, and heat dissipation fins fixedly mounted on the heat dissipation pipe; the heat dissipation pipe is provided with an oil inlet and an oil outlet, the oil inlet is located at the upper end of the fuel tank, and the oil outlet is located at the lower end of the fuel tank; the heat dissipation pipe is divided into a hard pipe section and a soft pipe section; The forced air cooling assembly includes: a fan for cooling the heat dissipation fins, a motor for driving the fan; and a speed increasing unit for increasing the flow of oil in the heat dissipation pipe. The cooling mechanism further includes: a rapid cooling component for rapidly cooling the transformer when an abnormality occurs; The rapid cooling assembly includes: an oil pillow fixedly mounted on the oil tank, an oil extraction port and an oil discharge port provided on the oil pillow, an impeller rotatably mounted at the oil extraction port, and a mixing assembly for mixing the oil in the oil tank as the impeller rotates; the oil extraction port of the oil pillow and the oil outlet of the heat dissipation pipe are linked via a pipe fitting; the oil discharge port is connected to the oil tank via a pipe fitting; three-way valves are provided on the oil extraction port and the oil outlet of the heat dissipation pipe; The mixing assembly includes: a cam fixedly connected to the impeller coaxially; a hinged rod rotatably connected to the cam at an eccentric position; and a mixing plate rotatably connected to the other end of the hinged rod; the mixing plate is limited by a limiting groove and the inner wall of the oil pillow.

2. The oil-immersed transformer according to claim 1, characterized in that: The speed increasing unit includes: an extrusion tank fixedly connected to the hard pipe section, a hose end surrounding the inner wall of the extrusion tank, a supporting plate rotatably mounted on the side wall of the extrusion tank, and a plurality of extrusion rollers arranged along the circumferential direction on the supporting plate; the supporting plate is coaxially fixedly connected to the motor through a connecting rod.

3. The oil-immersed transformer according to claim 1, characterized in that: The detection mechanism includes: a first detection component and a second detection component; The first detection assembly includes: a detection seat fixedly installed on the oil tank, a pressure plate slidably installed in the detection seat, and a sensing plate elastically connected to the pressure plate through a spring; the sensing plate is fixedly installed in the detection seat; and the detection seat is connected to the oil tank.

4. The oil-immersed transformer according to claim 3, characterized in that: The second detection component includes: a mercury chamber fixedly mounted on the sensor plate, mercury stored in the mercury chamber, a charged positive electrode inserted into the mercury chamber, a port opened on the mercury chamber, a wire fixedly mounted at the port, an electrically controlled three-way valve connected to the wire, and a pressure relief component for relieving the oil pressure in the fuel tank; the wire is connected to the negative electrode.

5. The oil-immersed transformer according to claim 4, characterized in that: The pressure relief assembly includes: an exhaust pipe running through the detection seat, a sealing cover for sealing the exhaust pipe, a magnetic part fixedly mounted on the sealing cover, and an electromagnet electrically connected to a wire; the magnetic poles of the electromagnet and the magnetic part repel each other; the sealing cover and the detection seat are elastically connected by a second spring; and the exhaust pipe is connected to the oil tank.

6. The oil-immersed transformer according to claim 5, characterized in that: The mercury chamber is divided into a storage chamber and an expansion chamber. The positive electrode is connected to the storage box, and the negative electrode is connected to the expansion chamber through a wire.

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