Oil immersed transformer capable of automatically starting and stopping fan according to load size

Abstract

This invention relates to the field of oil-immersed transformer technology, specifically to an oil-immersed transformer with an automatically starting and stopping fan based on load size. The transformer includes: a cooling chamber, horizontally positioned at the bottom of the transformer body; a first vent pipe, located at the upper part of one end of the cooling chamber and communicating with it; a fan positioned between the first vent pipe and the cooling chamber, used to blow outside air into the cooling chamber; the end of the first vent pipe away from the cooling chamber communicating with outside air and pointing vertically downwards; a second vent pipe, located at the other end of the cooling chamber and communicating with it; the end of the second vent pipe away from the cooling chamber communicating with outside air and pointing vertically downwards; and a cooling pipe located inside the cooling chamber, communicating with the transformer body. This invention improves the cooling efficiency of the device under high load and hot conditions, ensuring stable oil temperature.

Description

Technical Field

[0001] This invention relates to the field of oil-immersed transformer technology, specifically to an oil-immersed transformer with an automatically starting and stopping fan based on the load size. Background Technology

[0002] Oil-immersed transformers generate a lot of heat during operation, especially in hot weather when the outside temperature is high. Oil-immersed transformers rely solely on surface heat-conducting fins for heat dissipation, resulting in low heat exchange efficiency. Therefore, additional heat dissipation devices are needed to assist oil-immersed transformers in heat dissipation, thereby ensuring the normal operation of oil-immersed transformers.

[0003] Chinese Patent Publication No. CN118380243B discloses a rapidly cooling oil-immersed transformer, comprising: an oil-immersed transformer body, a matching base at the bottom of the oil-immersed transformer body, a second condenser tube inside the base, one end of the second condenser tube being connected to a pump box, and an agitator assembly inside the second condenser tube; a first condenser tube disposed on the side wall of the oil-immersed transformer body, one end of the first condenser tube being connected to the second condenser tube, and the end of the first condenser tube away from the second condenser tube being connected to the interior of the base, and a matching first fan blade disposed on the side wall of the oil-immersed transformer body at a position corresponding to the first condenser tube; and a filter assembly disposed inside the pump box, the filter assembly comprising a first filter plate and a second filter plate fixedly disposed inside the pump box.

[0004] Although existing oil-immersed transformers improve the cooling effect of their oil by adding fans, the cooling performance of the fans often drops significantly in hot environments and when the transformer is operating under high load. This is because the distance between the air intake and exhaust points of the fan is relatively short, resulting in high ambient air temperature. When this high-temperature air is drawn back into the condenser tubes for cooling, the temperature difference between the air being cooled and the oil in the condenser tubes decreases due to the high intake air temperature, leading to a reduction in cooling capacity. This situation worsens over time. In addition, to improve cooling efficiency, the fan power is usually increased. Most existing fans are directly installed on the side of the oil-immersed transformer. High-power fans are prone to resonance with the transformer body during operation, which can cause structural fatigue in both the fan and the transformer body. Summary of the Invention

[0005] To address the aforementioned issues, an oil-immersed transformer is provided that can automatically start and stop the fan based on the load. A temperature sensor monitors the oil temperature inside the transformer in real time, reflecting changes in the transformer's load. This allows the fan to automatically start and stop based on the oil temperature. Combined with the cooling chamber, first vent pipe, second vent pipe, and cooling pipes, outside air is allowed to smoothly enter the cooling chamber and exchange heat with the circulating oil in the cooling pipes. Furthermore, the rational layout of the inlet and outlet ports of the two vent pipes prevents the mixing of exhaust hot air and intake cold air, solving the problem of gradually increasing intake air temperature after prolonged fan operation in traditional devices, thus improving cooling efficiency under high load and hot conditions.

[0006] To address the problems of existing technologies, the present invention provides an oil-immersed transformer that can automatically start and stop the fan according to the load size, including a transformer body and a fan, wherein a temperature sensor for detecting the oil temperature is provided inside the transformer body. The oil-immersed transformer also includes: The cooling chamber is horizontally positioned at the bottom of the transformer body; The first vent pipe is located at the upper part of one end of the cooling chamber and is connected to the cooling chamber. The fan is located between the first vent pipe and the cooling chamber. The fan is used to blow outside air into the cooling chamber. The end of the first vent pipe away from the cooling chamber is connected to the outside air and is vertically downward. The second vent pipe is located at the other end of the cooling chamber and is connected to the cooling chamber. The end of the second vent pipe away from the cooling chamber is connected to the outside air and is vertically downward. A cooling pipe is installed inside the cooling chamber and is connected to the transformer body. The cooling pipe contains circulating transformer oil.

[0007] Preferably, the extension direction of the cooling pipe is parallel to the airflow direction inside the cooling chamber.

[0008] Preferably, multiple cooling pipes are arranged in a direction perpendicular to the airflow direction, and the ends of the multiple cooling pipes on the same side converge at a point in the transformer body and are interconnected.

[0009] Preferably, the cross-section of the cooling chamber is smaller than the cross-section of the first vent pipe and the cross-section of the second vent pipe.

[0010] Preferably, a transition pipe is provided between the cooling chamber and the first ventilation pipe, and the fan is disposed inside the transition pipe.

[0011] Preferably, a mounting bracket is vertically fixed in the transition tube, an extension rod is vertically provided at the lower part of the fan, a mounting hole is vertically provided on the mounting bracket for the extension rod to pass through, and a shock-absorbing pad is provided between the mounting bracket and the fan.

[0012] Preferably, the lower part of the shock-absorbing pad is provided with an extension pad, the extension pad has a ring structure, the extension pad extends into the mounting hole along the extension direction of the mounting hole and completely covers the inner wall of the mounting hole, and the extension rod passes through the inner ring of the extension pad.

[0013] Preferably, a partition membrane is provided around the fan, and the periphery of the partition membrane is connected to the wall of the transition tube.

[0014] Preferably, the partition membrane is provided with a support mesh connected to the surface of the partition membrane.

[0015] Preferably, a slot is provided on the side wall of both the first vent pipe and the second vent pipe in the horizontal direction, and a filter screen is inserted into both slots.

[0016] The advantages of this invention compared to the prior art are: 1. This invention uses a temperature sensor to detect the oil temperature inside the transformer in real time, reflecting the load changes of the transformer body. This allows the fan to automatically start and stop based on the oil temperature. Combined with the cooling chamber, first vent pipe, second vent pipe, and cooling pipe, it allows outside air to smoothly enter the cooling chamber and exchange heat with the circulating oil in the cooling pipe. Simultaneously, the rational layout of the inlet and outlet ports of the two vent pipes prevents the mixing of exhaust hot air and intake cold air, solving the problem of gradually increasing intake air temperature caused by long-term fan operation in traditional devices. This improves the cooling efficiency of the device under high load and hot environments, ensuring stable oil temperature and the normal operation of the transformer body. Furthermore, when the actual oil temperature is lower than the standard temperature, the fan stops operating, achieving energy savings.

[0017] 2. By setting the extension direction of the cooling pipes to be parallel to the airflow direction in the cooling chamber, and setting multiple cooling pipes perpendicular to the airflow direction with their ends connected on the same side, and designing the cross-section of the cooling chamber to be smaller than the cross-section of the two vent pipes, the arrangement of cooling pipes and the airflow structure are optimized, reducing airflow resistance, increasing the contact area between the cooling pipes and the air, and improving the airflow velocity, thereby further enhancing the heat exchange efficiency, achieving uniform and rapid cooling of the oil, making up for the shortcomings of insufficient cooling capacity and uneven cooling in the existing device, and adapting to the cooling requirements of transformers under different loads.

[0018] 3. By setting up structures such as transition pipes, mounting brackets, shock-absorbing pads, extension pads, partition membranes, support nets, and slotted filter screens, the system achieves stable fan installation, vibration buffering, efficient airflow guidance, anti-deformation of the partition membrane, and air filtration functions. This solves problems such as resonance between the fan and the transformer body, airflow leakage, dust accumulation, and easy wear and tear of components, extends the overall service life of the device, ensures stable operation of each component, maintains long-term and efficient cooling effect, and ensures long-term stable operation of the transformer body. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of an oil-immersed transformer that can automatically start and stop its fan according to the load size, as per the present invention. Figure 1 .

[0020] Figure 2 This is a three-dimensional schematic diagram of an oil-immersed transformer that can automatically start and stop its fan according to the load size, as per the present invention. Figure 2 .

[0021] Figure 3 This is a three-dimensional schematic diagram of the filter screen after being removed from an oil-immersed transformer that can automatically start and stop the fan according to the load size, according to the present invention.

[0022] Figure 4 This invention relates to an oil-immersed transformer with an automatically starting and stopping fan based on load size. Figure 3 A magnified view of a portion of point A in the middle.

[0023] Figure 5 This is a partially cutaway perspective view of an oil-immersed transformer that can automatically start and stop its fan according to the load size, according to the present invention.

[0024] Figure 6 This is a rear view of an oil-immersed transformer according to the present invention, which can automatically start and stop the fan according to the load size.

[0025] Figure 7 This invention relates to an oil-immersed transformer with an automatically starting and stopping fan based on load size. Figure 6 Schematic diagram of cross-section at point BB.

[0026] Figure 8 This is a cross-sectional perspective view of an oil-immersed transformer that can automatically start and stop its fan according to the load size, according to the present invention.

[0027] Figure 9 This invention relates to an oil-immersed transformer with an automatically starting and stopping fan based on load size. Figure 8 A magnified view of a portion of point C.

[0028] Figure 10 This is a three-dimensional schematic diagram of the shock-absorbing pad and fan in an oil-immersed transformer that can automatically start and stop the fan according to the load size, as described in this invention.

[0029] The following are the labels in the diagram: 1. Transformer body; 2. Fan; 3. Cooling chamber; 31. First vent pipe; 32. Second vent pipe; 33. Slot; 34. Filter screen; 4. Cooling pipe; 5. Transition pipe; 51. Mounting bracket; 511. Mounting hole; 52. Extension rod; 53. Shock-absorbing pad; 531. Extension pad; 6. Isolation membrane; 61. Support net. Detailed Implementation

[0030] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figures 1 to 8 An oil-immersed transformer that can automatically start and stop the fan 2 according to the load size includes a transformer body 1 and a fan 2, wherein a temperature sensor for detecting the oil temperature is provided inside the transformer body 1. The oil-immersed transformer also includes: Cooling chamber 3 is horizontally positioned at the bottom of the transformer body 1; The first vent pipe 31 is located at the upper part of one end of the cooling chamber 3 and is connected to the cooling chamber 3. The fan 2 is located between the first vent pipe 31 and the cooling chamber 3. The fan 2 is used to blow outside air into the cooling chamber 3. The end of the first vent pipe 31 away from the cooling chamber 3 is connected to the outside air and is vertically downward. The second vent pipe 32 is located at the other end of the cooling chamber 3 and is connected to the cooling chamber 3. The end of the second vent pipe 32 away from the cooling chamber 3 is connected to the outside air and is vertically downward. Cooling pipe 4 is installed inside the cooling chamber 3. Cooling pipe 4 is connected to the transformer body 1. Cooling pipe 4 contains circulating transformer oil.

[0032] During daily use, the load on transformer body 1 fluctuates. When the load on transformer body 1 increases, the temperature sensor installed in transformer body 1 can detect an increase in the oil temperature; conversely, when the load on transformer body 1 decreases, the temperature sensor can detect a decrease in the oil temperature. To save energy, fan 2 is not continuously operating. For example, when the ambient temperature is low, fan 2 is stopped; when the ambient temperature is high, fan 2 starts. The specific start-up time of fan 2 is based on the oil temperature detected by the temperature sensor. First, a standard temperature needs to be preset for the oil temperature inside transformer body 1. When the oil temperature detected by the temperature sensor is lower than the standard temperature, fan 2 is stationary. A pump is installed inside transformer body 1, connected to cooling pipe 4. The pump draws the oil from transformer body 1 into cooling pipe 4, circulates through cooling pipe 4, and then discharges it back into transformer body 1. The oil dissipates heat itself as it passes through cooling pipe 4. If the oil temperature detected by the temperature sensor is higher than the standard temperature, then fan 2 will start. When the actual oil temperature is higher than the standard temperature, the power of fan 2 is positively correlated with the oil temperature. That is, when the transformer body 1 is under heavy load, the oil temperature will continue to rise, and the power of fan 2 will also increase accordingly. When the transformer body 1 is under light load, the oil temperature will gradually decrease, and the power of fan 2 will also decrease. When the oil temperature is lower than the standard temperature, fan 2 will stop running.

[0033] During operation, a temperature sensor inside the transformer body 1 monitors the oil temperature in real time to reflect changes in the load on the transformer body 1. When the temperature sensor detects that the oil temperature is higher than the preset standard temperature, it indicates that the load on the transformer body 1 is large. At this time, the fan 2 starts, blowing outside air into the cooling chamber 3. The outside air can be drawn into the cooling chamber 3 by the fan 2 through the first vent pipe 31 or the second vent pipe 32, forming an airflow within the cooling chamber 3. The air entering the cooling chamber 3 flows along the extension direction of the cooling chamber 3, making full contact with the cooling pipes 4 installed inside the cooling chamber 3. The cooling pipes 4 contain circulating transformer oil. The flowing outside air exchanges heat with the oil in the cooling pipes 4, achieving cooling of the oil. If the outside air enters through the first vent pipe 31, the air after heat exchange is discharged to the outside through the second vent pipe 32; if the outside air enters through the second vent pipe 32, the air after heat exchange is discharged to the outside through the first vent pipe 31. The ends of the first vent pipe 31 and the second vent pipe 32 furthest from the transformer body 1 are ports for air intake and exhaust. These ports are vertically downwards to prevent rainwater from entering the cooling chamber 3 through the first vent pipe 31 or the second vent pipe 32. The air intake and exhaust ports of the first vent pipe 31 and the second vent pipe 32 are located on opposite sides of the transformer body 1. When the temperature sensor detects that the oil temperature is lower than the preset standard temperature, it indicates that the transformer body 1 is under low load. At this time, the fan 2 stops operating, and the transformer oil in the cooling pipe 4 can achieve cooling through natural heat exchange with the air in the cooling chamber 3, ensuring that the oil temperature is maintained within a reasonable range and guaranteeing the normal operation of the transformer body 1.

[0034] Since the ports of the first vent pipe 31 and the second vent pipe 32 for intake and exhaust are located on both sides of the transformer body 1, when the fan 2 starts, there is a certain distance between the ends of the first vent pipe 31 and the second vent pipe 32 for intake and exhaust. This avoids the hot air being discharged from mixing with the cooler air that is about to enter the cooling chamber 3 from the outside, resulting in a higher temperature of the air entering the cooling chamber 3. This avoids the problem of reduced cooling temperature difference caused by the close distance between the intake and exhaust air of the traditional fan 2, thus improving the cooling efficiency under high load and hot conditions and ensuring the stability of the transformer oil temperature. At the same time, the cooling pipe 4 is set at the bottom of the transformer body 1, which prevents the transformer body 1 from heating the air around it during operation. The rising hot air would affect the normal heat dissipation of the cooling pipe 4, reducing interference with the cooling effect.

[0035] Reference Figures 1 to 8 The extension direction of the cooling pipe 4 is parallel to the airflow direction inside the cooling chamber 3.

[0036] After the fan 2 is started, an airflow will be formed in the cooling chamber 3 along its extension direction. Setting the extension direction of the cooling pipe 4 to be parallel to the airflow direction can effectively reduce the resistance encountered by the airflow, avoid the airflow obstruction problem caused by the traditional cooling pipe 4 arrangement, and allow the airflow to flow more smoothly over the surface of the cooling pipe 4, increase the contact time and contact area between the air and the cooling pipe 4, thereby improving the heat exchange efficiency, better solving the technical problem of insufficient cooling capacity of the existing device, ensuring that the transformer oil in the cooling pipe 4 can be cooled down quickly, and ensuring the stable operation of the transformer body 1 under high load and hot environment.

[0037] Reference Figures 1 to 8 Multiple cooling pipes 4 are arranged in a direction perpendicular to the airflow direction, and the ends of multiple cooling pipes 4 on the same side converge at a point inside the transformer body 1 and are interconnected.

[0038] Multiple cooling pipes 4 are installed perpendicular to the airflow direction inside the cooling chamber 3, and the ends of the multiple cooling pipes 4 converge at a point inside the transformer body 1 and are interconnected. This allows the circulating oil in the transformer body 1 to be diverted through the connection and flow evenly into each cooling pipe 4. At the same time, the oil that has completed heat exchange can also be collected through the connection on the other side and flow back into the transformer body 1. This arrangement increases the total contact area between the cooling pipes 4 and the air, further improving the heat exchange efficiency, while achieving uniform cooling of the oil. It avoids the problem of uneven cooling caused by excessive load on a single cooling pipe 4, effectively makes up for the shortcomings of the poor cooling effect of the existing device, ensures the stability of the oil temperature, and thus ensures the normal operation of the transformer body 1.

[0039] Reference Figures 1 to 8 The cross-section of the cooling chamber 3 is smaller than the cross-section of the first vent pipe 31 and the cross-section of the second vent pipe 32.

[0040] After the fan 2 is started, outside air enters the cooling chamber 3 through the first vent pipe 31 or the second vent pipe 32. Since the cross-section of the cooling chamber 3 is smaller than that of the two vent pipes, the air will accelerate after entering the cooling chamber 3, which will increase the air velocity in the cooling chamber 3. The faster air velocity can exchange heat with the cooling pipe 4 more quickly, and at the same time, it can expel the hot air after heat exchange to the outside more quickly. This effectively solves the technical problems of slow airflow and low heat exchange efficiency in the existing device, further improves the cooling effect, and ensures that the oil temperature can be reduced quickly under high load and hot environment, ensuring the stable operation of the transformer body 1.

[0041] Reference Figures 5 to 7 A transition pipe 5 is provided between the cooling chamber 3 and the first ventilation pipe 31, and the fan 2 is installed inside the transition pipe 5.

[0042] Reference Figure 9 and Figure 10 A mounting bracket 51 is vertically fixed in the transition tube 5, and an extension rod 52 is vertically installed at the lower part of the fan 2. The mounting bracket 51 has a vertically opened mounting hole 511 for the extension rod 52 to pass through, and a shock-absorbing pad 53 is provided between the mounting bracket 51 and the fan 2.

[0043] The lower end of the extension rod 52 is threaded. After the extension rod 52 passes through the mounting hole 511, the fan 2 is installed by the threaded engagement of the nut with the extension rod 52.

[0044] By vertically installing a mounting bracket 51 inside the transition tube 5, the extension rod 52 of the lower part of the fan 2 passes through the mounting hole 511 on the mounting bracket 51, and then uses the thread and nut on the extension rod 52 to achieve a stable installation of the fan 2 inside the transition tube 5, ensuring that the fan 2 will not shift during operation and ensuring the stability of airflow guidance. At the same time, a shock-absorbing pad 53 is installed between the mounting bracket 51 and the fan 2, which can effectively buffer the vibration generated by the fan 2 during operation, and prevent the vibration of the fan 2 from being transmitted to the transition tube 5 through the mounting bracket 51, and then to the cooling chamber 3 and the transformer body 1. This solves the technical problem that the fan 2 and the transformer body 1 are prone to resonance during operation in the existing device, leading to structural fatigue, reducing equipment wear, extending the overall service life of the device, and ensuring the stable operation of the fan 2 and the transformer body 1, ensuring that the cooling effect is not affected.

[0045] Reference Figure 10 The lower part of the shock-absorbing pad 53 is provided with an extension pad 531. The extension pad 531 has a ring structure. The extension pad 531 extends into the mounting hole 511 along the extension direction of the mounting hole 511 and completely covers the inner wall of the mounting hole 511. The extension rod 52 passes through the inner ring of the extension pad 531.

[0046] An annular extension pad 531 is provided at the lower part of the shock-absorbing pad 53, so that the extension pad 531 covers the inner wall of the mounting hole 511 along the extension direction of the mounting hole 511. The extension rod 52 passes through the inner ring of the extension pad 531, avoiding direct contact between the extension rod 52 and the inner wall of the mounting hole 511, and further optimizing the shock absorption effect. The vibration generated by the operation of the fan 2 will be buffered by the extension pad 531 and the shock-absorbing pad 53, effectively weakening the vibration transmission, further reducing the probability of resonance between the fan 2 and the transformer body 1, reducing the structural damage caused by resonance, and avoiding frictional loss between the extension rod 52 and the mounting hole 511, extending the service life of the extension rod 52 and the mounting bracket 51, ensuring that the fan 2 is installed firmly and operates stably, thereby ensuring airflow circulation and cooling effect, and solving the technical problems of resonance loss and component wear in existing devices.

[0047] Reference Figure 5 and Figure 9The fan 2 is surrounded by a partition membrane 6, and the periphery of the partition membrane 6 is connected to the wall of the transition pipe 5.

[0048] A partition membrane 6 is installed around the fan 2, and the periphery of the partition membrane 6 is connected to the wall of the transition pipe 5. This effectively blocks the gap between the fan 2 and the wall of the transition pipe 5, preventing the suction effect generated by the fan 2 from being weakened by the gap. This ensures that the fan 2 can efficiently guide the airflow between the transition pipe 5, the cooling chamber 3, and the first vent pipe 31, avoiding the problem of insufficient airflow velocity and reduced heat exchange efficiency in the cooling chamber 3 due to air leakage from the gap. At the same time, the partition membrane 6 can isolate the airflow in the transition pipe 5 from the outside, ensuring that the airflow entering the cooling chamber 3 can be effectively guided, improving the stability and effectiveness of the airflow circulation, further solving the technical problems of insufficient airflow guidance and poor cooling effect in the existing device, and ensuring the cooling efficiency of the oil.

[0049] Reference Figure 5 and Figure 9 The partition membrane 6 is provided with a support mesh 61 that is connected to the surface of the partition membrane 6.

[0050] A support mesh 61 is installed on the surface of the partition membrane 6 and connected to the partition membrane 6, which can effectively limit the degree of deformation of the partition membrane 6. When the fan 2 is running, a pressure difference will be formed on both sides of the partition membrane 6, which can easily cause the partition membrane 6 to expand and deform. The support mesh 61 can support and limit the partition membrane 6, preventing the partition membrane 6 from being damaged due to excessive deformation and extending the service life of the partition membrane 6. At the same time, the support mesh 61 will not affect the normal flow of air, ensuring that the partition membrane 6 can continue to play its role in blocking gaps and guiding airflow, ensuring the efficiency of the fan 2 in guiding airflow, thereby maintaining the cooling effect of the device, and solving the technical problem of the partition membrane 6 being easily deformed and damaged and affecting airflow guidance in the existing device.

[0051] Reference Figure 5 and Figure 9 Both the first vent pipe 31 and the second vent pipe 32 have a slot 33 opened in the horizontal direction on their side walls, and a filter screen 34 is inserted into each of the two slots 33.

[0052] A filter screen 34 is inserted into the slot 33 of the first vent pipe 31 and the second vent pipe 32. When outside air enters the cooling chamber 3 through the two vent pipes, the filter screen 34 filters the air, intercepting dust and other impurities carried in the air. This prevents dust from adhering to the surface of the cooling pipe 4 after entering the cooling chamber 3, thus reducing the heat dissipation efficiency of the cooling pipe 4. This solves the technical problem of dust accumulation affecting the cooling effect in existing devices. At the same time, the filter screen 34 is installed in the slot 33 by insertion, which facilitates subsequent disassembly, replacement and cleaning. This ensures that the filter screen 34 can continuously perform its filtering function, maintain the cooling efficiency of the device, ensure the normal heat dissipation of the cooling pipe 4, and thus ensure the stable temperature of the transformer oil and the normal operation of the transformer body 1.

[0053] The working principle of this invention is as follows: When the temperature sensor detects that the oil temperature is higher than the standard temperature, the fan 2 rotates. At this time, the fan 2 draws out the air from the cooling chamber 3 and discharges it through the first vent pipe 31. Outside air is replenished into the cooling chamber 3 through the second vent pipe 32, so that the air in the cooling chamber 3 flows along the extension direction of the cooling chamber 3. When the power of the fan 2 increases, the air velocity in the cooling chamber 3 increases, and the cooling capacity of the cooling pipe 4 increases accordingly. When the power of the fan 2 decreases, the air velocity in the cooling chamber 3 decreases, and the cooling capacity of the cooling pipe 4 also decreases accordingly. When the outside air enters the cooling chamber 3 from the second vent pipe 32, it will pass through the filter screen 34 set in the second vent pipe 32. The outside air must be filtered by the filter screen 34 before entering the cooling chamber 3 to avoid dust carried by the outside air remaining in the cooling chamber 3, which would cause dust accumulation in the cooling chamber 3, and thus avoid the situation where dust accumulation affects the normal heat dissipation of the cooling pipe 4. In addition, to avoid airflow obstruction caused by the meandering structure of traditional cooling pipes 4, the structure of the cooling pipes 4 located on the outside of the transformer body 1 is designed as a straight structure, so that the extension direction of the cooling pipes 4 is parallel to the airflow direction, reducing the resistance encountered by the airflow and making the cooling effect of the fan 2 better under the same power. To improve the cooling effect, multiple cooling pipes 4 are set at the lower part of the transformer body 1. All cooling pipes 4 are designed as straight structures and parallel to the airflow direction in the cooling chamber 3. The ends of all cooling pipes 4 on the same side extend into the transformer body 1 and converge at a point, connecting with each other to form two connection points. The pump body is located at either of the two connection points. That is, the pump body draws the oil in the transformer body 1 to one connection point, and after being diverted by the cooling pipes 4, it gathers at the other connection point and flows back into the transformer body 1. During operation, fan 2 intermittently rotates forward or reverse, thereby altering the airflow direction within the cooling chamber 3. Since both the first vent pipe 31 and the second vent pipe 32 are equipped with dust-trapping filters 34, the periodic change in airflow direction caused by the fan 2's rotation provides a self-cleaning function for the filters 34, extending their lifespan. When the filters 34 reach their designated working time, they can be removed from their slots 33 and replaced. Furthermore, the cross-section of the cooling chamber 3 is smaller than that of the first vent pipe 31 and the second vent pipe 32, causing an acceleration effect on the air entering the cooling chamber 3 upon entry, resulting in faster airflow from the cooling chamber 3.

[0054] As a supplement, since the fan 2 and the transformer body 1 will resonate when they run together, a transition pipe 5 is set between the first vent pipe 31 and the cooling pipe 4 to avoid structural damage caused by resonance. The vertically set mounting bracket 51 in the transition pipe 5 is used to support the fan 2. In order to prevent the vibration generated by the operation of the fan 2 from being transmitted to the transition pipe 5 through the mounting bracket 51, a shock-absorbing pad 53 is set between the mounting bracket 51 and the fan 2. The shock-absorbing pad 53 is also provided with an extension pad 531 at the bottom. The extension pad 531 extends into the mounting hole 511 and covers the inside of the mounting hole 511, so as to avoid direct contact between the extension rod 52 set at the bottom of the fan 2 and the mounting hole 511 of the mounting bracket 51, thereby reducing the mutual influence between the fan 2 and the transformer body 1 when they are working. Since fan 2 is only supported by mounting bracket 51, and fan 2 does not contact the wall of transition pipe 5, a gap exists between fan 2 and the wall of transition pipe 5. When fan 2 is running, the suction effect generated by fan 2 is limited, and it cannot effectively guide the air in cooling chamber 3. To avoid this situation, a partition membrane 6 is fitted around fan 2 to block the gap. The periphery of partition membrane 6 is connected to the wall of transition pipe 5, so that the air in transition pipe 5 and the air in first vent pipe 31 can only communicate through fan 2. In addition, when fan 2 is running, a negative pressure zone will be formed on one side of partition membrane 6, causing partition membrane 6 to be prone to expansion and deformation. To overcome the above problem, a support net 61 is set on partition membrane 6. The support net 61 is directly connected to the surface of partition membrane 6, which can effectively limit the degree of deformation of partition membrane 6 and extend the service life of partition membrane 6.

[0055] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An oil-immersed transformer that can automatically start and stop the fan according to the load size, comprising a transformer body (1) and a fan (2), wherein a temperature sensor for detecting the oil temperature is provided inside the transformer body (1); Its features are, The oil-immersed transformer also includes: The cooling chamber (3) is horizontally positioned at the bottom of the transformer body (1); The first ventilation pipe (31) is located at the upper part of one end of the cooling chamber (3) and communicates with the cooling chamber (3). The fan (2) is located between the first ventilation pipe (31) and the cooling chamber (3). The fan (2) is used to blow outside air into the cooling chamber (3). The end of the first ventilation pipe (31) away from the cooling chamber (3) communicates with the outside air and is vertically downward. The second vent pipe (32) is located at the other end of the cooling chamber (3) and is connected to the cooling chamber (3). The end of the second vent pipe (32) away from the cooling chamber (3) is connected to the outside air and is vertically downward. Cooling pipe (4) is installed inside the cooling chamber (3). The cooling pipe (4) is connected to the transformer body (1). The cooling pipe (4) contains circulating transformer oil.

2. An oil-immersed transformer capable of automatically starting and stopping its fan according to the load size, as described in claim 1, is characterized in that... The extension direction of the cooling pipe (4) is parallel to the airflow direction inside the cooling chamber (3).

3. An oil-immersed transformer capable of automatically starting and stopping its fan according to the load size, as described in claim 2, is characterized in that... Multiple cooling pipes (4) are arranged in a direction perpendicular to the air flow direction. The ends of multiple cooling pipes (4) on the same side converge at a point in the transformer body (1) and are interconnected.

4. An oil-immersed transformer capable of automatically starting and stopping its fan according to the load size, as described in any one of claims 1 to 3, characterized in that, The cross-section of the cooling chamber (3) is smaller than the cross-section of the first vent pipe (31) and the cross-section of the second vent pipe (32).

5. An oil-immersed transformer according to claim 1, characterized in that, A transition pipe (5) is provided between the cooling chamber (3) and the first ventilation pipe (31), and the fan (2) is located inside the transition pipe (5).

6. An oil-immersed transformer according to claim 5, characterized in that, A mounting bracket (51) is vertically fixed in the transition tube (5), and an extension rod (52) is vertically installed at the lower part of the fan (2). A mounting hole (511) is vertically opened on the mounting bracket (51) for the extension rod (52) to pass through. A shock-absorbing pad (53) is provided between the mounting bracket (51) and the fan (2).

7. An oil-immersed transformer capable of automatically starting and stopping its fan according to the load size, as described in claim 6, is characterized in that... The lower part of the shock-absorbing pad (53) is provided with an extension pad (531). The extension pad (531) has a ring structure. The extension pad (531) extends into the mounting hole (511) along the extension direction of the mounting hole (511) and completely covers the inner wall of the mounting hole (511). The extension rod (52) passes through the inner ring of the extension pad (531).

8. An oil-immersed transformer according to claim 5, characterized in that, The fan (2) is surrounded by a partition membrane (6), and the periphery of the partition membrane (6) is connected to the wall of the transition pipe (5).

9. An oil-immersed transformer according to claim 8, characterized in that, The partition membrane (6) is provided with a support mesh (61) that is connected to the surface of the partition membrane (6).

10. An oil-immersed transformer according to claim 1, characterized in that, Both the first vent pipe (31) and the second vent pipe (32) have a slot (33) opened in the horizontal direction on their side walls, and a filter screen (34) is inserted into both slots (33).

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