Oil-immersed transformer

Abstract

The utility model discloses an oil-immersed transformer, and belongs to the technical field of electrics. The oil-immersed transformer comprises an equipment box body, an oil outlet assembly, a heat dissipation assembly, an oil return assembly and a power assembly, transformer oil is driven by the power assembly to circulate between a first cavity of the equipment box body and a second cavity of the heat dissipation assembly, the circulation convection speed of the transformer oil can be increased, and therefore the heat dissipation efficiency of the oil-immersed transformer can be improved. Moreover, the equipment box body and the heat dissipation assembly are two independent structures which are adjacently arranged, when the heat dissipation assembly is damaged, only the heat dissipation assembly can be maintained or replaced, and the maintenance difficulty of the oil-immersed transformer can be reduced. In addition, the oil return assembly can distribute the transformer oil cooled by the heat dissipation assembly to different positions in the equipment box body, so that the internal temperature distribution of the oil-immersed transformer is more uniform.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to an oil-immersed transformer. Background Technology

[0002] With the advancement of technology and the development of the power industry, transformers, as fundamental equipment for power transmission and distribution, are widely used in industries, agriculture, transportation, and urban communities. A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Oil-immersed transformers are a new type of high-performance transformer with a more rational structure and superior performance. Oil-immersed transformers use transformer oil as an insulation and heat dissipation medium to ensure normal operation at high temperatures.

[0003] Currently, oil-immersed transformers typically include a core, windings, tank, conservator, insulating bushings, tap changer, and gas relay. The tank is usually a corrugated sheet tank, which consists of a tank body and corrugated radiators distributed around the tank body. The corrugated radiators are used to increase the heat dissipation area of ​​the oil-immersed transformer, thereby cooling it down.

[0004] Because the transformer oil in the tank and corrugated radiator of the aforementioned oil-immersed transformer usually relies on natural convection to form circulation, the heat dissipation efficiency of the immersed transformer is relatively low. Utility Model Content

[0005] This utility model provides an oil-immersed transformer. It solves the problem of low heat dissipation efficiency in existing oil-immersed transformers. The technical solution is as follows:

[0006] The oil-immersed transformer includes: an equipment enclosure, an oil outlet assembly, a heat dissipation assembly, an oil return assembly, and a power assembly;

[0007] The equipment enclosure is arranged adjacent to the heat dissipation component. The equipment enclosure has a first chamber, and the heat dissipation component has a second chamber. Both the first chamber and the second chamber are used to hold transformer oil.

[0008] The oil outlet assembly has a first oil inlet and a first oil outlet. The first oil inlet is connected to the first chamber of the equipment housing, and the first oil outlet is connected to the second chamber of the heat dissipation assembly.

[0009] The oil return assembly has a second oil inlet and multiple second oil outlets. The second oil inlet is connected to the second chamber of the heat dissipation assembly, and the multiple second oil outlets are respectively connected to multiple locations in the first chamber of the equipment housing.

[0010] The power assembly is installed on at least one of the oil outlet assembly and the oil return assembly, and is used to drive the transformer oil to circulate between the first chamber of the equipment housing and the second chamber of the heat dissipation assembly.

[0011] Optionally, the heat dissipation assembly includes heat dissipation fins and a heat dissipation fan;

[0012] The heat dissipation fins are arranged adjacent to the equipment housing, the second chamber is located in the heat dissipation fins, and the heat dissipation fins are respectively connected to the oil outlet assembly and the oil return assembly;

[0013] The cooling fan is located on the side of the heat dissipation fins that is away from the equipment housing.

[0014] Optionally, the oil-immersed transformer further includes a first temperature sensor and a controller;

[0015] The first temperature sensor is mounted on the heat sink fins;

[0016] Both the first temperature sensor and the cooling fan are electrically connected to the controller.

[0017] Optionally, the oil return assembly includes a main oil return pipe and multiple branch oil return pipes;

[0018] The main oil return pipe is located between the plurality of oil return branch pipes and the heat dissipation fins, and the oil inlet of the main oil return pipe is the second oil inlet.

[0019] The inlets of the plurality of return oil branch pipes are all connected to the outlets of the main return oil pipe, and the outlets of the plurality of return oil branch pipes are the plurality of second outlets.

[0020] Optionally, the plurality of second oil outlets are arranged along a target direction, which intersects with the ground.

[0021] Optionally, the oil-immersed transformer further includes multiple second temperature sensors, and the oil return assembly further includes multiple oil return valves;

[0022] The plurality of second temperature sensors are all located in the first chamber of the equipment housing, and the plurality of second temperature sensors are flush with the plurality of second oil outlets in a one-to-one correspondence.

[0023] The plurality of return oil valves are installed on the plurality of return oil branch pipes in a one-to-one correspondence;

[0024] The plurality of second temperature sensors and the plurality of return oil valves are all connected to the controller.

[0025] Optionally, the oil-immersed transformer further includes a winding located in the first chamber of the equipment enclosure;

[0026] The plurality of second temperature sensors are all arranged adjacent to the winding.

[0027] Optionally, the main return oil pipeline extends into the first chamber of the equipment housing;

[0028] The plurality of return oil branch pipes are all located in the first chamber of the equipment housing, and the oil outlets of the plurality of return oil branch pipes are all arranged adjacent to the winding.

[0029] Optionally, the oil-immersed transformer further includes an iron core, a third temperature sensor, and a controller, and the power assembly includes an oil pump;

[0030] The iron core and the third temperature sensor are both located in the first chamber of the equipment housing, and the iron core and the third temperature sensor are arranged adjacent to each other.

[0031] The oil pump is mounted on the oil outlet assembly, and both the third temperature sensor and the oil pump are electrically connected to the controller.

[0032] Optionally, the oil outlet assembly includes an oil extraction pipe and an oil delivery pipe;

[0033] The oil inlet of the oil extraction pipe is connected to the first chamber of the equipment housing, and the oil outlet of the oil extraction pipe is connected to the oil pump.

[0034] The oil inlet of the oil pipeline is connected to the oil pump, and the oil outlet of the oil pipeline is connected to the second chamber of the heat dissipation assembly.

[0035] The oil inlet of the oil extraction pipe is located at the top of the first chamber of the equipment housing, and the oil outlet of the oil delivery pipe is located at the bottom of the second chamber of the heat dissipation assembly.

[0036] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0037] An oil-immersed transformer is provided, comprising an equipment enclosure, an oil outlet assembly, a heat dissipation assembly, an oil return assembly, and a power assembly. The power assembly drives the transformer oil to circulate between the first chamber of the equipment enclosure and the second chamber of the heat dissipation assembly, thereby increasing the circulation and convection velocity of the transformer oil and improving the heat dissipation efficiency of the oil-immersed transformer. Furthermore, the equipment enclosure and the heat dissipation assembly are two adjacent but independent structures; when the heat dissipation assembly fails, only the heat dissipation assembly needs to be repaired or replaced, reducing the maintenance difficulty of the oil-immersed transformer.

[0038] Furthermore, the oil return assembly in this embodiment of the invention has multiple second oil outlets. The transformer oil, cooled in the heat dissipation assembly, can then be channeled through these outlets to different locations within the first chamber of the equipment housing. In other words, the oil return assembly can distribute the cooled transformer oil to different locations within the equipment housing, resulting in a more uniform temperature distribution inside the oil-immersed transformer. This prevents localized overheating within the oil-immersed transformer, ensuring stable operation and improving its performance and lifespan. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of an oil-immersed transformer provided in an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of another oil-immersed transformer provided in this embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0044] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0045] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0046] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0047] Oil-immersed transformers typically include a core, windings, tank, conservator, bushings, tap changer, and gas relay. The tank is usually a corrugated sheet tank, consisting of an enclosure and corrugated radiators distributed around it. During operation, oil-immersed transformers generate heat, creating a temperature difference inside the transformer. This causes natural convection in the transformer oil. The heated oil is cooled by the corrugated radiators and then flows back into the enclosure, thus lowering the internal temperature of the transformer.

[0048] When the load on the transformer changes or the ambient temperature changes, the temperature of the transformer oil inside the transformer will also change, causing the transformer oil to change volume due to thermal expansion and contraction. Since the wall thickness of the equipment box in this oil-immersed transformer is greater than the wall thickness of the corrugated radiator, the expansion and contraction of the corrugated radiator is usually used to compensate for the volume change of the transformer oil caused by the temperature change. In other words, the corrugated radiator has the functions of heat dissipation and compensating for the volume change of the transformer oil.

[0049] Because the load on a transformer is constantly changing during operation, the corrugated radiator needs to withstand repeated expansion and contraction. Prolonged use can lead to damage to the corrugated radiator, causing oil leakage and rendering the entire transformer unusable. This necessitates the replacement of the entire transformer housing and the corrugated radiator, resulting in a shorter lifespan for oil-immersed transformers.

[0050] Furthermore, relying on natural convection to form circulation results in low heat dissipation efficiency of the immersion transformer, and it cannot ensure uniform temperature in all parts of the transformer, which may lead to local overheating, thereby affecting the stable operation of the transformer and thus impacting its performance and service life.

[0051] The above-mentioned technical problems, in part and in part, can be optimized through the limited embodiments of the present invention described below.

[0052] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an oil-immersed transformer 10 provided in an embodiment of the present utility model. The oil-immersed transformer 10 may include: an equipment housing 11, an oil outlet assembly 12, a heat dissipation assembly 13, an oil return assembly 14, and a power assembly 15.

[0053] The equipment enclosure 11 can be arranged adjacent to the heat dissipation component 13. The equipment enclosure 11 has a first chamber, and the heat dissipation component 13 has a second chamber. Both the first chamber and the second chamber are used to hold transformer oil.

[0054] The oil outlet assembly 12 has a first oil inlet and a first oil outlet. The first oil inlet is connected to the first chamber of the equipment housing 11, and the first oil outlet is connected to the second chamber of the heat dissipation assembly 13. The oil outlet assembly 12 can be connected to both the first chamber of the equipment housing 11 and the second chamber of the heat dissipation assembly 13. When the oil-immersed transformer 10 generates heat during operation, the temperature of the transformer oil in the first chamber of the equipment housing 11 rises. The higher-temperature transformer oil in the first chamber of the equipment housing 11 can be transferred to the second chamber of the heat dissipation assembly 13 through the oil outlet assembly 12.

[0055] The oil return assembly 14 has a second oil inlet and multiple second oil outlets. The second oil inlet is connected to the second chamber of the heat dissipation assembly 13, and the multiple second oil outlets are respectively connected to multiple locations in the first chamber of the equipment housing 11. The heat dissipation assembly 13 can be used to dissipate heat and cool the transformer oil located in the second chamber. The oil return assembly 14 can be connected to both the first chamber of the equipment housing 11 and the second chamber of the heat dissipation assembly 13. The transformer oil with a lower temperature in the second chamber of the heat dissipation assembly 13 can be transferred to the first chamber of the equipment housing 11 through the oil return assembly 14.

[0056] The power assembly 15 can be installed on at least one of the oil outlet assembly 12 and the oil return assembly 14 to drive the transformer oil to circulate between the first chamber of the equipment housing 11 and the second chamber of the heat dissipation assembly 13. That is, the power assembly 15 can be installed on either the oil outlet assembly 12 or the oil return assembly 14, or the power assembly 15 includes a first power assembly 15 and a second power assembly 15, which are respectively installed on the oil outlet assembly 12 and the oil return assembly 14. The power assembly 15 provides power for the circulation of transformer oil between the first chamber of the equipment housing 11 and the second chamber of the heat dissipation assembly 13. For example, the power assembly 15 may include a pumped oil pump or a submersible pump.

[0057] In summary, this utility model embodiment provides an oil-immersed transformer 10 comprising a housing 11, an oil outlet assembly 12, a heat dissipation assembly 13, an oil return assembly 14, and a power assembly 15. The power assembly 15 drives the transformer oil to circulate between the first chamber of the housing 11 and the second chamber of the heat dissipation assembly 13, thereby increasing the circulation convection speed of the transformer oil and improving the heat dissipation efficiency of the oil-immersed transformer 10. Furthermore, the housing 11 and the heat dissipation assembly 13 are two adjacent and independent structures. When the heat dissipation assembly 13 is damaged, only the heat dissipation assembly 13 needs to be repaired or replaced, reducing the maintenance difficulty of the oil-immersed transformer 10.

[0058] Furthermore, the oil return assembly 14 in this embodiment of the invention has multiple second oil outlets. The transformer oil cooled in the heat dissipation assembly 13, after passing through the oil return assembly 14, can be input to different locations within the first chamber of the equipment housing 11 through these multiple second oil outlets. In other words, the oil return assembly 14 can divert the transformer oil cooled by the heat dissipation assembly 13 to different locations within the equipment housing 11, thereby making the internal temperature distribution of the oil-immersed transformer 10 more uniform. This avoids localized overheating within the oil-immersed transformer 10, enabling stable operation and improving its performance and service life.

[0059] Please refer to Figure 1 In one optional embodiment, the heat dissipation assembly 13 may include heat dissipation fins 131 and a heat dissipation fan 132; the heat dissipation fins 131 are disposed adjacent to the equipment housing 11, the second chamber is located in the heat dissipation fins 131, and the heat dissipation fins 131 are respectively connected to the oil outlet assembly 12 and the oil return assembly 14; the heat dissipation fan 132 is located on the side of the heat dissipation fins 131 away from the equipment housing 11.

[0060] The heat dissipation fins 131 may include multiple heat dissipation fins, which can be arranged in parallel to increase the heat dissipation area and improve heat dissipation efficiency. For example, the heat dissipation fins may include flat fins, V-shaped fins, corrugated fins, or serrated fins. Flat fins have a simple shape and are relatively easy to manufacture; V-shaped fins can increase the heat dissipation area and improve heat dissipation efficiency; corrugated fins can change the airflow direction, increasing the contact time between the air and the fins and improving heat dissipation efficiency; serrated fins can enhance heat exchange by increasing air turbulence and creating vortices on the fin surface.

[0061] The heat sink fins can be made of metals with high thermal conductivity, such as aluminum alloys or copper alloys, which can effectively absorb and transfer heat.

[0062] In one exemplary embodiment, the oil-immersed transformer 10 may further include a mounting frame, which may be fixedly connected to the outside of the equipment housing 11, and the heat dissipation fins 131 may be installed in the mounting frame to fix the heat dissipation fins 131.

[0063] The airflow generated by the cooling fan 132 can cover the heat dissipation fins 131. The cooling fan 132 can accelerate the heat exchange between the air and the heat dissipation fins 131 through forced convection, thereby dissipating the heat transferred from the transformer oil on the heat dissipation fins 131 to the external environment in a timely manner. In this way, the combined structure of the heat dissipation fins 131 and the cooling fan 132 can increase the contact area between the heat dissipation component 13 and the air, while also increasing the convection speed of the air in contact with the heat dissipation fins 131. This can improve the heat dissipation efficiency of the heat dissipation component 13 for the transformer oil, thereby quickly reducing the internal temperature of the oil-immersed transformer 10 and reducing the performance degradation and safety hazards of the oil-immersed transformer 10 caused by overheating.

[0064] Please refer to Figure 1 In an optional embodiment, the oil-immersed transformer 10 may further include a first temperature sensor (not shown) and a controller 16; the first temperature sensor is mounted on the heat sink fins 131; both the first temperature sensor and the cooling fan 132 are electrically connected to the controller 16. The first temperature sensor can be used to monitor the temperature of the heat sink fins 131 at a preset time or in real time.

[0065] The first temperature sensor may include a negative temperature coefficient thermistor (NTC thermistor). The resistance of a negative temperature coefficient thermistor decreases as the temperature increases. NTC thermistors have a fast response and high accuracy, and can be used to collect and monitor the temperature of the heat sink fins 131 in real time.

[0066] For example, the controller 16 may include a first temperature comparator and a first switching circuit. The first temperature comparator is electrically connected to the first switching circuit, and the first switching circuit is electrically connected to the cooling fan 132. The positive input terminal of the first temperature comparator is electrically connected to the output terminal of the first temperature sensor, while the negative input terminal is connected to a preset temperature threshold or reference voltage. When the temperature detected by the first temperature sensor exceeds the temperature threshold, the sampling signal voltage will be higher than the reference voltage, and the first temperature comparator can output a high-level signal. Conversely, when the temperature detected by the first temperature sensor is lower than the temperature threshold, the sampling signal voltage will be lower than the reference voltage, and the first temperature comparator can output a low-level signal or not output a signal. The first switching circuit receives the output signal from the first temperature comparator and can adjust the on / off state of the cooling fan 132 according to the high / low level state of the signal.

[0067] For example, the controller 16 can intelligently regulate the cooling fan 132 based on the temperature of the heat sink 131. When the temperature of the heat sink 131 reaches a temperature threshold, the speed of the cooling fan 132 is increased according to the temperature of the heat sink 131. Alternatively, within a preset speed range, the speed of the cooling fan 132 is controlled to be positively correlated with the temperature of the heat sink 131; that is, the higher the temperature of the heat sink 131, the faster the speed of the cooling fan 132 can be.

[0068] Please refer to Figure 1 In one optional embodiment, the oil return assembly 14 may include a main oil return pipe 141 and multiple branch oil return pipes 142. The main oil return pipe 141 is located between the multiple branch oil return pipes 142 and the heat dissipation fins 131, and the oil inlet of the main oil return pipe 141 is a second oil inlet. The oil inlets of the multiple branch oil return pipes 142 are all connected to the oil outlet of the main oil return pipe 141, and the oil outlets of the multiple branch oil return pipes 142 are multiple second oil outlets. In this way, the cooled transformer oil can be transported to multiple locations within the equipment housing 11 through the multiple branch oil return pipes 142, thereby making the temperature within the equipment housing 11 more uniform.

[0069] In one optional embodiment, multiple second oil outlets are arranged along a target direction, which intersects the ground. For example, the target direction is perpendicular to the ground. Since transformer oil at higher temperatures typically has a higher density than that at lower temperatures—due to the increased thermal motion of oil molecules as temperature rises, causing the oil to expand in volume and decrease in density—under the influence of gravity, the higher-temperature (lower-density) oil tends to rise, while the lower-temperature (higher-density) oil tends to sink. When the internal temperature of the oil-immersed transformer 10 is high, relying solely on natural convection caused by the temperature difference to cool the internal structure may result in uneven temperature distribution at different heights within the transformer 10. Therefore, by injecting cooled transformer oil into different heights of the equipment housing 11 of the oil-immersed transformer 10 through multiple second oil outlets, the internal temperature distribution of the oil-immersed transformer 10 becomes more uniform. This avoids localized overheating within the oil-immersed transformer 10.

[0070] In an optional embodiment, the oil-immersed transformer 10 may further include a winding 17 and a plurality of second temperature sensors (not shown in the figure). The winding 17 is located in the first chamber of the equipment housing 11, and the plurality of second temperature sensors are all arranged adjacent to the winding 17. The oil return assembly 14 may further include a plurality of oil return valves 143; the plurality of second temperature sensors are all located in the first chamber of the equipment housing 11, and the plurality of second temperature sensors are flush with the plurality of second oil outlets; the plurality of oil return valves 143 are installed on the plurality of oil return branch pipes 142; the plurality of second temperature sensors and the plurality of oil return valves 143 are all connected to the controller 16. The plurality of oil return valves 143 may include electrically operated flow regulating valves.

[0071] The winding 17 may include multiple layers of winding 17, and multiple second temperature sensors may be located at different layers of winding 17. In this embodiment of the invention, the multiple second temperature sensors are flush with the multiple second oil outlets in a one-to-one correspondence, meaning that the height of any one second temperature sensor is flush with the height of its corresponding second oil outlet.

[0072] Multiple second temperature sensors can be used to detect the temperature at different locations inside the equipment enclosure 11. The controller 16 links multiple second temperature sensors and multiple return oil valves 143. While the cooled transformer oil is diverted to different parts inside the equipment enclosure 11, the controller 16 can adjust the opening status of multiple return oil valves 143 based on the real-time monitoring of the temperature at different locations by the second temperature sensors. This makes the internal temperature distribution of the transformer more uniform and improves the operational stability of the oil-immersed transformer 10.

[0073] For example, when the temperature detected by one of the multiple second temperature sensors is greater than the threshold temperature, the controller 16 can increase the flow rate of the return oil valve 143 corresponding to the second temperature sensor; when the temperature detected by one of the multiple second temperature sensors is less than the threshold temperature, the controller 16 can decrease the flow rate of the return oil valve 143 corresponding to the second temperature sensor.

[0074] In one optional embodiment, the main oil return pipe 141 extends into the first chamber of the equipment housing 11; multiple oil return branch pipes 142 are all located within the first chamber of the equipment housing 11, and the oil outlets of the multiple oil return branch pipes 142 are all adjacent to the winding 17. The equipment housing 11 has a first mounting through hole, through which the main oil return pipe 141 can pass, so that the oil outlet of the main oil return pipe is located in the first chamber of the equipment housing 11, and the multiple oil inlets of the multiple oil return branch pipes can all be connected to the oil outlet of the main oil return pipe. Since the heating elements of the oil-immersed transformer 10 mainly include the iron core 18 and the winding 17 during operation, and the winding 17 is sleeved on the iron core 18, in this embodiment of the present invention, the cooled transformer oil can be output to the vicinity of the winding 17 through the multiple oil outlets of the multiple oil return branch pipes 142, thereby cooling the winding 17 and improving the heat dissipation efficiency of the oil-immersed transformer 10.

[0075] Please refer to Figure 2 , Figure 2 This is a schematic diagram of another oil-immersed transformer 10 provided in an embodiment of the present invention. In an exemplary embodiment, the equipment housing 11 has a plurality of first mounting through holes, the main oil return pipe 141 is located on the outside of the equipment housing 11, and a plurality of oil return branch pipes 142 can pass through the plurality of first mounting through holes respectively, so that the plurality of oil outlets of the plurality of oil return branch pipes 142 are located in the first chamber of the equipment housing 11.

[0076] Alternatively, the main return oil pipe 141 and multiple return oil branch pipes 142 are located on the outside of the equipment housing 11, and multiple oil outlets of the multiple return oil branch pipes 142 are connected to the first chamber of the equipment housing 11 through multiple first mounting through holes.

[0077] Please refer to Figure 1 and Figure 2In an optional embodiment, the oil-immersed transformer 10 may further include a core 18, a third temperature sensor (not shown), and a controller 16. The power assembly 15 includes an oil pump. The core 18 and the third temperature sensor are both located in the first chamber of the equipment housing 11 and are arranged adjacent to each other. The oil pump is mounted on the oil outlet assembly 12, and both the third temperature sensor and the oil pump are electrically connected to the controller 16. The oil pump may include an oil-immersed pump, and the controller 16 can regulate the speed of the oil-immersed pump according to the temperature detected by the third temperature sensor. For example, when the temperature detected by the third temperature sensor is greater than a threshold temperature, the controller 16 can increase the speed of the oil-immersed pump; when the temperature detected by the third temperature sensor is less than the threshold temperature, the controller 16 can decrease the speed of the oil-immersed pump, thereby improving the adaptability and reliability of the oil-immersed transformer 10.

[0078] In an optional embodiment, the oil outlet assembly 12 may include an oil extraction pipe 121 and an oil delivery pipe 122. The inlet of the oil extraction pipe 121 is connected to the first chamber of the equipment housing 11, and the outlet of the oil extraction pipe 121 is connected to an oil pump. The inlet of the oil delivery pipe 122 is connected to the oil pump, and the outlet of the oil delivery pipe 122 is connected to the second chamber of the heat dissipation assembly 13. The inlet of the oil extraction pipe 121 is located at the top of the first chamber of the equipment housing 11, and the outlet of the oil delivery pipe 122 is located at the bottom of the second chamber of the heat dissipation assembly 13. Thus, since the density of transformer oil at higher temperatures is generally greater than that at lower temperatures, the oil outlet assembly 12 can deliver the higher-temperature transformer oil located at the top of the equipment housing 11 to the bottom of the heat dissipation assembly 13, thereby improving heat dissipation efficiency.

[0079] It should be noted that the dimensions of the areas may have been exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element is referred to as "on top of" another element, it can be directly on the other element, or there may be intermediate elements. Additionally, it is understood that when an element is referred to as "below" another element, it can be directly below the other element, or there may be more than one intermediate element. Furthermore, it is also understood that when an element is referred to as "between" two elements, it can be the only layer between the two elements, or there may be more than one intermediate element. Similar reference numerals throughout indicate similar elements.

[0080] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0081] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An oil-immersed transformer, characterized in that, include: Equipment housing, oil outlet assembly, heat dissipation assembly, oil return assembly, and power assembly; The equipment enclosure is arranged adjacent to the heat dissipation component. The equipment enclosure has a first chamber, and the heat dissipation component has a second chamber. Both the first chamber and the second chamber are used to hold transformer oil. The oil outlet assembly has a first oil inlet and a first oil outlet. The first oil inlet is connected to the first chamber of the equipment housing, and the first oil outlet is connected to the second chamber of the heat dissipation assembly. The oil return assembly has a second oil inlet and multiple second oil outlets. The second oil inlet is connected to the second chamber of the heat dissipation assembly, and the multiple second oil outlets are respectively connected to multiple locations in the first chamber of the equipment housing. The power assembly is installed on at least one of the oil outlet assembly and the oil return assembly, and is used to drive the transformer oil to circulate between the first chamber of the equipment housing and the second chamber of the heat dissipation assembly.

2. The oil-immersed transformer according to claim 1, characterized in that, The heat dissipation assembly includes heat dissipation fins and a heat dissipation fan; The heat dissipation fins are arranged adjacent to the equipment housing, the second chamber is located in the heat dissipation fins, and the heat dissipation fins are respectively connected to the oil outlet assembly and the oil return assembly; The cooling fan is located on the side of the heat dissipation fins that is away from the equipment housing.

3. The oil-immersed transformer according to claim 2, characterized in that, The oil-immersed transformer also includes a first temperature sensor and a controller; The first temperature sensor is mounted on the heat sink fins; Both the first temperature sensor and the cooling fan are electrically connected to the controller.

4. The oil-immersed transformer according to claim 3, characterized in that, The oil return assembly includes a main oil return pipe and multiple branch oil return pipes; The main oil return pipe is located between the plurality of oil return branch pipes and the heat dissipation fins, and the oil inlet of the main oil return pipe is the second oil inlet. The inlets of the plurality of return oil branch pipes are all connected to the outlets of the main return oil pipe, and the outlets of the plurality of return oil branch pipes are the plurality of second outlets.

5. The oil-immersed transformer according to claim 4, characterized in that, The plurality of second oil outlets are arranged along the target direction, which intersects with the ground.

6. The oil-immersed transformer according to claim 5, characterized in that, The oil-immersed transformer also includes multiple second temperature sensors, and the oil return assembly also includes multiple oil return valves; The plurality of second temperature sensors are all located in the first chamber of the equipment housing, and the plurality of second temperature sensors are flush with the plurality of second oil outlets in a one-to-one correspondence. The plurality of return oil valves are installed on the plurality of return oil branch pipes in a one-to-one correspondence; The plurality of second temperature sensors and the plurality of return oil valves are all connected to the controller.

7. The oil-immersed transformer according to claim 6, characterized in that, The oil-immersed transformer also includes windings, which are located in the first chamber of the equipment enclosure; The plurality of second temperature sensors are all arranged adjacent to the winding.

8. The oil-immersed transformer according to claim 7, characterized in that, The main return oil pipeline extends into the first chamber of the equipment housing; The plurality of return oil branch pipes are all located in the first chamber of the equipment housing, and the oil outlets of the plurality of return oil branch pipes are all arranged adjacent to the winding.

9. The oil-immersed transformer according to claim 1, characterized in that, The oil-immersed transformer also includes an iron core, a third temperature sensor, and a controller; the power assembly includes an oil pump. The iron core and the third temperature sensor are both located in the first chamber of the equipment housing, and the iron core and the third temperature sensor are arranged adjacent to each other. The oil pump is mounted on the oil outlet assembly, and both the third temperature sensor and the oil pump are electrically connected to the controller.

10. The oil-immersed transformer according to claim 9, characterized in that, The oil outlet assembly includes an oil extraction pipe and an oil delivery pipe; The oil inlet of the oil extraction pipe is connected to the first chamber of the equipment housing, and the oil outlet of the oil extraction pipe is connected to the oil pump. The oil inlet of the oil pipeline is connected to the oil pump, and the oil outlet of the oil pipeline is connected to the second chamber of the heat dissipation assembly. The oil inlet of the oil extraction pipe is located at the top of the first chamber of the equipment housing, and the oil outlet of the oil delivery pipe is located at the bottom of the second chamber of the heat dissipation assembly.

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