Oil-immersed transformer with intelligent temperature control system

Abstract

The invention relates to the field of transformers, in particular to an oil-immersed transformer with an intelligent temperature control system. An inner cavity of the transformer is divided into an infiltration cavity wrapping the outer side of an iron core winding, an upper outflow cavity and a lower outflow cavity through a pair of partition plates, and the upper outflow cavity and the lower outflow cavity are located on the two sides of the infiltration cavity; insulating oil is injected from the middle of the infiltration cavity and flows out from the upper outflow cavity and the lower outflow cavity, then mixing heat exchange of the insulating oil is carried out in the mixing barrel, a traditional natural flowing path formed by temperature difference of the insulating oil is replaced, and the insulating oil can reach the state that heat is evenly distributed more quickly; the problem of local overheating of the iron core winding caused by slow heat exchange due to natural flowing of the insulating oil is solved, meanwhile, the insulating oil fully flows in the infiltration cavity and fully flows and is in contact with the surface of the iron core winding through the confluence disc arranged on the partition plate, the spray pipe provided with a pair of spray holes and the flow guide column, and the heat dissipation efficiency is further improved.

Description

Technical Field

[0001] The invention relates to an oil-immersed transformer, in particular to an oil-immersed transformer with an intelligent temperature control system applied in the transformer field. Background Art

[0002] The oil-immersed transformer is mainly composed of a body, an oil tank, a cooling device, a protection device and an outlet device. The core body includes windings and iron cores. The windings are wound with copper or aluminum wires wrapped with insulating paper, and the iron cores are made of stacked silicon steel sheets to form a magnetic circuit. The oil tank is filled with transformer oil, which plays an important role in heat dissipation during the operation of the transformer. Under normal circumstances, as the temperature rises, the specific gravity of the oil decreases, the viscosity decreases, and the fluidity increases, which automatically promotes the flow of oil to achieve heat dissipation and cooling. However, when the insulating oil does not flow sufficiently, it may cause local overheating of the iron core. Local overheating will not only reduce the working efficiency of the iron core, but also prevent the heat generated by it from being dissipated in time, thereby affecting the normal operation of the transformer; at the same time, excessive temperature will accelerate the aging of the iron core and insulating materials and shorten their service life. In addition, long-term local overheating may also cause more serious faults, such as multi-point grounding of the iron core and reduced insulation resistance, which pose a threat to the safe and stable operation of the transformer. Therefore, ensuring sufficient flow of insulating oil is crucial to maintaining the performance of the oil-immersed transformer.

[0003] The existing patent with publication number CN102682957B discloses an oil-immersed transformer with an automatic heating device, which relates to a transformer. Transformer oil is the electrical insulating medium of the transformer. When the air temperature is lower than the freezing point of the transformer oil, the transformer cannot be started, which affects the normal operation of the power system. The present invention includes a transformer box, a transformer body arranged in the transformer box, and transformer oil injected into the transformer box. It is characterized in that: the oil-immersed transformer is also provided with an automatic heating device, and the automatic heating device includes a heating box arranged at the bottom of the transformer box, a heating element located in the heating box, and a first temperature controller that controls the operation of the heating element according to the oil temperature of the transformer box. A plurality of heating boxes arranged at intervals are provided at the bottom of the transformer box, and the top surface of the heating box is in close contact with the bottom surface of the transformer box. The technical solution can heat the transformer oil when the temperature is lower than the freezing point of the transformer oil until the transformer oil melts and the transformer can be started, thereby ensuring the normal operation of the power system.

[0004] The above patent overcomes the problem of reduced heat dissipation efficiency caused by excessive viscosity of transformer oil during low-temperature startup by setting a heating device at the bottom of the transformer, but does not solve the problem of local overheating of the core winding caused by the small flow range when the transformer oil flows naturally by convection. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is the problem of local overheating of the core winding caused by insufficient transformer oil flow in the existing oil-immersed transformer.

[0006] In order to solve the above problems, the present invention provides an oil-immersed transformer with an intelligent temperature control system, comprising a shell and an iron core winding, wherein the upper and lower ends of the iron core winding are fixedly connected to the inner walls of the front and rear ends of the shell through a pair of symmetrically arranged mounting plates, and a partition fixedly connected to the shell is provided on the side of the mounting plate away from the iron core winding, and an infiltration cavity is formed between the inner end surfaces of the pair of partitions and the inner wall of the shell, and the infiltration cavity is filled with insulating oil, and an upper outflow cavity and a lower outflow cavity distributed up and down are respectively formed between the outer end surfaces of the pair of partitions and the inner wall of the shell, and a conduit for collecting the insulating oil in the middle of the partition and flowing it out to the upper outflow cavity or the lower outflow cavity is fixed at the center position of the pair of partitions;

[0007] An upper heat dissipation pipe connected to the upper outflow chamber and a lower heat dissipation pipe connected to the lower outflow chamber are fixedly connected to the outer wall of the shell. The upper heat dissipation pipe and the lower heat dissipation pipe are fixedly connected to the same mixing cylinder at one end away from the shell. The mixing cylinder is fixedly connected to the inner wall of the shell and connected to the infiltration chamber. A pushing impeller for pushing the insulating oil from the mixing cylinder to the infiltration chamber is provided in the mixing cylinder. The pushing impeller is connected to an output end of the dual-axis motor. The outer end of the dual-axis motor is fixedly connected to a mounting frame sleeved on the outside of the mixing cylinder and fixedly connected to the outer wall of the shell. The mounting frame is fixedly connected to an air guide cylinder on the side away from the mixing cylinder. A heat dissipation impeller fixedly connected to the other output end of the dual-axis motor is installed in the air guide cylinder. The confluence plate is provided with evenly distributed external through holes, and a heating wire is fixedly connected to the inside of the confluence plate.

[0008] The dual-axis motor is electrically connected to a controller fixed on a mounting frame, and a temperature control system is mounted in the controller. The temperature control system includes a control module. The input end of the control module is connected to a monitoring module. The input ends of the monitoring module are respectively connected to a first temperature sensor and a second temperature sensor. The first temperature sensor is fixed at a connection point between an upper outflow cavity and an upper heat dissipation pipe, and the second temperature sensor is fixed at a connection point between a lower outflow cavity and a lower heat dissipation pipe. The output ends of the control module are respectively connected to a mixing module and a heating module. The output end of the mixing module is connected to the dual-axis motor, and the output end of the heating module is connected to a heating wire.

[0009] In the above-mentioned oil-immersed transformer with an intelligent temperature control system, a mixing cylinder connected with an upper heat dissipation pipe and a pair of partitions provided with a busbar allows the transformer oil to fully flow on the surface of the core winding and perform mixed heat exchange, thereby quickly achieving uniform distribution of heat in the transformer.

[0010] As a further improvement of the present application, the mixing barrel is a horizontally arranged cylindrical structure, an inner wall of the mixing barrel away from the pushing impeller is fixedly connected to an isolation barrel, the isolation barrel and the inner wall of the mixing barrel form an annular cavity, a spiral guide vane is fixedly connected to the inner side of the isolation barrel, an annular baffle that divides the annular cavity is fixedly connected to the outer wall of the isolation barrel away from the spiral guide vane, the mixing barrel is located below the annular baffle and is fixedly connected to a slag discharge hood connected to the annular cavity, and the lower end of the slag discharge hood is fixedly connected to a waste slag box.

[0011] As a further improvement of the present application, a slag discharge hole connected to the annular cavity is provided on the isolation cylinder, a reflux hole is provided on the right side of the annular baffle of the isolation cylinder, a vertical baffle extending to the lower end of the slag discharge cover is fixedly connected below the annular baffle, and the vertical baffle divides the inner cavity of the slag discharge cover into two independent cavities on the left and right; a first viscosity sensor is provided at the connection point between the upper outflow cavity and the upper heat dissipation pipe, and a second viscosity sensor is provided at the connection point between the lower outflow cavity and the lower heat dissipation pipe, and both the first viscosity sensor and the second viscosity sensor are connected to the input end of the monitoring module.

[0012] As a further improvement of the present application, a nozzle arranged on the outside of the core winding is fixedly connected to the connection point between the mixing cylinder and the infiltration chamber, and the nozzle is provided with a pair of spray holes facing the left and right side walls of the core winding. A pair of guide columns for guiding the insulating oil to the middle gap of the core winding are fixedly connected between a pair of mounting plates, and an internal through hole is provided on the portion of the mounting plate located between the guide columns and the core winding; a rectangular gap for the flow of insulating oil is formed between the pair of mounting plates and the left inner wall and the right inner wall of the outer shell.

[0013] As a further improvement of the present application, the guide column is a prismatic structure with a triangular cross-section and the tip is facing the middle gap of the core winding. The outer end face of the guide column is fixedly connected to the inner wall of the infiltration cavity. The nozzle is a three-way pipe and has an overall U-shaped structure. The nozzle passes through the guide column.

[0014] As a further improvement of the present application, the upper heat dissipation pipe includes a plurality of branch pipes which are linearly and equidistantly distributed and fixedly connected to the outer shell. The branch pipes are connected to the outflow cavity on the upper side through connecting holes provided on the outer shell. The lower ends of the branch pipes are fixedly connected to the main pipe. The middle part of the lower end of the main pipe is fixedly connected to a filling pipe, and the filling pipe is connected to the mixing barrel. The lower heat dissipation pipe has the same structure as the upper heat dissipation pipe and is arranged opposite to each other.

[0015] As a further improvement of the present application, the mounting frame is a U-shaped frame structure with an open right end. The mounting frame and the outer wall of the outer shell enclose a rectangular cavity with front and back openings. The mounting frame and the corresponding part of the air guide tube are provided with evenly distributed air holes that connect the rectangular cavity and the inner cavity of the air guide tube.

[0016] As a further improvement of the present application, the isolation cylinder is a hollow cylindrical structure with a trumpet-shaped opening at the front end, and a spiral cavity is formed between the spiral guide vane and the inner wall of the isolation cylinder. There are multiple slag discharge holes and they are evenly distributed in a spiral pattern, and there are multiple reflux holes and they are arranged in an inclined radial pattern, and the opening of the reflux hole is facing the side away from the spiral guide vane.

[0017] As a further improvement of the present application, a filter plate fixedly connected to the lower end of the vertical baffle is provided on the upper part of the waste slag box. The filter plate is arc-shaped and the lower end is fixedly connected to the right inner wall of the waste slag box. A filter net is fixedly connected inside the filter plate.

[0018] In summary, the present invention divides the inner cavity of the transformer into an infiltration cavity wrapped around the outside of the core winding and an upper outflow cavity and a lower outflow cavity located on both sides of the infiltration cavity through a pair of partitions, and through a mixing cylinder connected to the upper heat dissipation tube and the lower heat dissipation tube, the insulating oil is injected from the middle of the infiltration cavity and flows out from the upper outflow cavity and the lower outflow cavity, and then the insulating oil is mixed and heat exchanged in the mixing cylinder, replacing the natural flow path formed by the temperature difference of the traditional insulating oil, so that the insulating oil can reach a state of uniform heat distribution faster, and overcome the problem of local overheating of the core winding caused by the slow natural flow and heat exchange of the insulating oil. At the same time, through the confluence plate arranged on the partition, the nozzle with a pair of spray holes and the guide column, the insulating oil can fully flow in the infiltration cavity and fully flow and contact with the surface of the core winding, further improving the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of this application;

[0020] Figure 2 This is a schematic diagram of the explosion structure of this application;

[0021] Figure 3 This is a module diagram of the temperature control system in this application;

[0022] Figure 4 It is a three-dimensional cross-sectional structural schematic diagram of the present application;

[0023] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 6 for Figure 4 A schematic diagram of the enlarged structure at B in the middle;

[0025] Figure 7 It is a three-dimensional assembly diagram of the upper heat dissipation pipe, the mixing tube and the lower heat dissipation pipe in this application;

[0026] Figure 8 is a schematic diagram of the flow of insulating oil in a transverse cross-sectional view of the present application;

[0027] Fig. 9 is a schematic diagram of the flow of insulating oil in a horizontal cross-sectional view of the present application;

[0028] Fig.10 is a schematic diagram of the flow of insulating oil in the longitudinal cross-sectional view of the present application;

[0029] Fig.11 This is a schematic diagram of the internal structure of the mixing cylinder in this application;

[0030] Fig.12 This is a schematic diagram of the explosion assembly of the mixing cylinder in this application;

[0031] Fig.13 Schematic diagram of the separation of insulating oil and precipitated impurities in this application.

[0032] Description of the numbers in the figure:

[0033] 1. Shell; 101, connecting hole; 2. Iron core winding; 3. Mounting plate; 301, inner through hole; 302, rectangular gap; 4. Partition; 5. Convergence plate; 501, outer through hole; 502, heating wire; 6. Guide column; 7. Upper heat pipe; 701, branch pipe; 702, main pipe; 703, filling pipe; 8. Mixing cylinder; 9. Lower heat pipe; 10. Push impeller; 11. Dual-axis motor; 12. Mounting frame; 13. Guide Air duct; 14, heat dissipation impeller; 15, first temperature sensor; 16, first viscosity sensor; 17, second temperature sensor; 18, second viscosity sensor; 19, nozzle; 20, controller; 21, isolation tube; 2101, slag discharge hole; 2102, reflux hole; 22, annular baffle; 23, slag discharge cover; 24, waste slag box; 25, vertical baffle; 26, filter plate; 27, filter net; 28, spiral guide vane. DETAILED DESCRIPTION

[0034] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0035] The first implementation method:

[0036] Figure 1-10 An oil-immersed transformer with an intelligent temperature control system is shown, comprising a shell 1 and an iron core winding 2, wherein the upper and lower ends of the iron core winding 2 are fixedly connected to the inner walls of the front and rear ends of the shell 1 through a pair of symmetrically arranged mounting plates 3, and a partition 4 fixedly connected to the shell 1 is provided on the side of the mounting plate 3 away from the iron core winding 2, and an infiltration cavity is formed between the inner end surfaces of the pair of partitions 4 and the inner wall of the shell 1, and the infiltration cavity is filled with insulating oil, and an upper outflow cavity and a lower outflow cavity distributed up and down are respectively formed between the outer end surfaces of the pair of partitions 4 and the inner wall of the shell 1, and a conduit 5 for gathering the insulating oil to the middle of the partition 4 and flowing out to the upper outflow cavity or the lower outflow cavity is fixed at the center position of the pair of partitions 4;

[0037] See also Figure 6 and Figure 8 The outer wall of the shell 1 is fixedly connected with an upper heat dissipation pipe 7 connected with the upper outflow cavity and a lower heat dissipation pipe 9 connected with the lower outflow cavity. The upper heat dissipation pipe 7 and the lower heat dissipation pipe 9 are fixedly connected with the same mixing cylinder 8 at one end away from the shell 1. The mixing cylinder 8 is fixedly connected with the inner wall of the shell 1 and is connected with the infiltration cavity; a pushing impeller 10 is provided in the mixing cylinder 8 to push the insulating oil from the mixing cylinder 8 to the infiltration cavity, and the pushing impeller 10 is connected with an output end of a dual-axis motor 11. The outer end of the dual-axis motor 11 is fixedly connected with a mounting frame 12 which is sleeved on the outside of the mixing cylinder 8 and fixedly connected to the outer wall of the shell 1. The mounting frame 12 is fixedly connected with an air guide cylinder 13 on the side away from the mixing cylinder 8, and a heat dissipation impeller 14 fixedly connected to the other output end of the dual-axis motor 11 is installed in the air guide cylinder 13; the confluence plate 5 is provided with evenly distributed external through holes 501, and a heating wire 502 is fixedly connected to the inside of the confluence plate 5;

[0038] See also Figure 3 and Figure 8 The dual-axis motor 11 is electrically connected to a controller 20 fixed on the mounting frame 12. The controller 20 is equipped with a temperature control system. The temperature control system includes a control module. The input end of the control module is connected to a monitoring module. The input end of the monitoring module is respectively connected to a first temperature sensor 15 and a second temperature sensor 17. The first temperature sensor 15 is fixed at the connection between the upper outflow cavity and the upper heat dissipation pipe 7, and the second temperature sensor 17 is fixed at the connection between the lower outflow cavity and the lower heat dissipation pipe 9; the output end of the control module is respectively connected to a mixing module and a heating module. The output end of the mixing module is connected to the dual-axis motor 11, and the output end of the heating module is connected to the heating wire 502.

[0039] Specifically, when the transformer is working normally, the infiltration cavity, the outflow cavity on both sides thereof, the upper heat dissipation tube 7 and the lower heat dissipation tube 9 are all filled with insulating oil. Figure 3 and Figure 8-10 , the temperature control system includes the following steps when working:

[0040] Step 1, monitoring the temperature; monitoring the temperature of the insulating oil in the upper outflow chamber by the first temperature sensor 15, and monitoring the temperature of the lower outflow chamber by the second temperature sensor 17;

[0041] Step 2: The controller 20 compares the two sets of real-time temperatures obtained with the set first temperature threshold. When the real-time temperature difference between the real-time temperature of the upper outflow chamber and the real-time temperature of the lower outflow chamber exceeds the set first temperature threshold range, the controller 20 starts the dual-axis motor 11, and the dual-axis motor 11 drives the pusher impeller 10 to rotate, so as to perform forced active circulation of the insulating oil and change the flow path of the insulating oil during natural convection.

[0042] Specifically, the push impeller 10 pushes the insulating oil in the mixing barrel 8 to be injected from the middle of the infiltration chamber, so that the insulating oil flows out from the upper heat dissipation tube 7 and the lower heat dissipation tube 9 respectively, then is mixed in the mixing barrel 8, and then is injected into the middle of the infiltration chamber; at the same time, the dual-axis motor 11 drives the heat dissipation impeller 14 to rotate, so that the external air flow flows through the upper heat dissipation tube 7 and the lower heat dissipation tube 9 to dissipate the insulating oil; by changing the flow path of the insulating oil, the insulating oil in the upper and lower parts of the infiltration chamber is quickly mixed and heat exchanged, the temperature difference of the insulating oil in the upper and lower parts of the infiltration chamber is reduced, the local overheating in the infiltration chamber is reduced, the service life of the equipment is extended, the heat dissipation efficiency is improved, and the heat dissipation efficiency of the upper heat dissipation tube 7 and the lower heat dissipation tube 9 is further increased by the heat dissipation impeller 14 blowing on the upper heat dissipation tube 7 and the lower heat dissipation tube 9;

[0043] It should be noted that the natural convection path of the insulating oil is that the insulating oil with higher heat slowly moves from the bottom of the infiltration cavity to the upper part of the infiltration cavity due to the internal temperature difference, and then flows into the upper outflow cavity through the upper conduit 5, and then flows from the upper outflow cavity into the upper heat dissipation tube 7, and then flows from the mixing cylinder 8 into the lower heat dissipation tube 9, and then flows from the lower outflow cavity through the lower conduit 5 into the lower part of the infiltration cavity, and circulates in this way;

[0044] Step three, when the real-time temperature difference between the real-time temperature of the upper outflow cavity and the real-time temperature of the lower outflow cavity exceeds the set second temperature threshold range, the heating wire 502 in the busbar 5 located in the lower outflow cavity is started to auxiliary heat the insulating oil flowing out of the lower outflow cavity, further reduce the temperature difference between the upper outflow cavity and the lower outflow cavity, and further accelerate the uniform distribution of heat in the insulating oil.

[0045] It should be particularly noted that the first set temperature threshold and the second temperature range are set by personnel in this field according to needs. Usually, in order to reduce energy loss, the second temperature threshold is greater than the first temperature threshold, that is, only when the temperature difference between the upper outflow chamber and the lower outflow chamber is large and the speed of heat dispersion through circulation mixing is slow, the heating wire 502 in the lower busbar 5 is started; in addition, when the temperature of the insulating oil in the upper outflow chamber and the lower outflow chamber is greatly different from the normal circulation temperature, it is necessary to start the heating wire 502 in the upper and lower busbars 5 at the same time.

[0046] Compared with the traditional oil-immersed transformer, the present invention divides the inner cavity of the transformer into an immersion cavity wrapped around the outside of the core winding and an upper outflow cavity and a lower outflow cavity located on both sides of the immersion cavity through a pair of partitions, and through a mixing cylinder connected to the upper heat dissipation pipe and the lower heat dissipation pipe, the insulating oil is injected from the middle of the immersion cavity and flows out from the upper outflow cavity and the lower outflow cavity, and then the insulating oil is mixed and heat exchanged in the mixing cylinder, replacing the natural flow path formed by the temperature difference of the traditional insulating oil, so that the insulating oil can reach a state of uniform heat distribution faster, and overcome the problem of local overheating of the core winding caused by the slow natural flow and heat exchange of the insulating oil. At the same time, through the confluence plate arranged on the partition, the nozzle with a pair of spray holes and the guide column, the insulating oil can fully flow in the immersion cavity and fully flow and contact with the surface of the core winding, further improving the heat dissipation efficiency.

[0047] See also Figure 2 , Figure 6 , Figure 8 and Fig. 9 The mixing cylinder 8 is fixedly connected to the infiltration chamber at the connection point with a nozzle 19 arranged on the outside of the core winding 2. The nozzle 19 is provided with a pair of spray holes facing the left and right side walls of the core winding 2. A pair of guide columns 6 for guiding the insulating oil to the middle gap of the core winding 2 are fixedly connected between the pair of mounting plates 3. The portion of the mounting plate 3 located between the guide columns 6 and the core winding 2 is provided with an inner through hole 301; a rectangular gap 302 for the insulating oil to flow is formed between the pair of mounting plates 3 and the left inner wall and the right inner wall of the shell 1.

[0048] Specifically, the insulating oil sprayed from the mixing barrel 8 is sprayed toward the left and right side walls of the core winding 2 through a pair of nozzle holes of the nozzle 19, part of the insulating oil flows along the side walls of the core winding 2, part of the insulating oil flows to the guide column 6 under the action of the inner wall of the shell 1, and then flows to the middle gap of the core winding 2 under the guidance of the guide column 6, and the insulating oil after flushing the middle gap of the core winding 2 flows to the busbar 5 through the inner through hole 301 on the mounting plate 3; at the same time, part of the insulating oil that flushes the left and right side walls of the core winding 2 flows to the busbar 5 after passing through the rectangular gap 302, thereby achieving sufficient flow of the insulating oil in the wetting cavity and making flow contact with various parts of the core winding 2, further enhancing the heat exchange and heat dissipation effects.

[0049] See also Figure 2 and Fig. 9 The guide column 6 is a prismatic structure with a triangular cross-section and its tip is facing the middle gap of the core winding 2. The outer end surface of the guide column 6 is fixedly connected to the inner wall of the infiltration cavity. The nozzle 19 is a three-way pipe and has an overall U-shaped structure. The nozzle 19 passes through the guide column 6.

[0050] Specifically, the mixed insulating oil is sprayed toward the left and right side walls of the core winding 2 through the nozzle 19 with an overall U-shaped structure, and the insulating oil on both sides is guided to the middle gap of the core winding 2 for secondary collision through the prismatic guide column 6, thereby further improving the mixed heat exchange effect.

[0051] See also Figure 6 and Figure 7 The upper heat dissipation pipe 7 includes a plurality of branch pipes 701 which are linearly and equidistantly distributed and fixedly connected to the outer shell 1. The branch pipe 701 is connected to the outflow cavity on the upper side through a connecting hole 101 provided on the outer shell 1. The lower end of the branch pipe 701 is fixedly connected to a main pipe 702. The middle part of the lower end of the main pipe 702 is fixedly connected to a filling pipe 703. The filling pipe 703 is connected to the mixing barrel 8. The lower heat dissipation pipe 9 has the same structure as the upper heat dissipation pipe 7 and is arranged opposite to each other.

[0052] Specifically, by providing a plurality of branch pipes 701 , the upper heat dissipation pipe 7 has a larger contact area with the external air, and cooperates with the heat dissipation impeller 14 to achieve better heat exchange and heat dissipation effects.

[0053] See also Figure 2 and Figure 4 The mounting frame 12 is a U-shaped frame structure with an opening at the right end. The mounting frame 12 and the outer wall of the shell 1 enclose a rectangular cavity with front and rear openings. The mounting frame 12 and the air guide tube 13 are provided with evenly distributed ventilation holes that connect the rectangular cavity and the inner cavity of the air guide tube 13.

[0054] Specifically, after starting the heat dissipation impeller 14, the external air flow enters the inner side of the mounting frame 12 through the front and rear openings of the rectangular cavity, then contacts the upper heat dissipation pipe 7 and the lower heat dissipation pipe 9, and then is injected into the air guide tube 13 through the vents, and finally is discharged under the action of the heat dissipation impeller 14, which has a better flow heat dissipation effect.

[0055] In this embodiment, the branch pipe 701, the main pipe 702 and the filling pipe 703 are all made of heat-conducting materials, and the mixing cylinder 8 is made of heat-insulating materials.

[0056] Specifically, the thermal conductive material is one of stainless steel, copper and aluminum, and the thermal insulation material is one of rubber, glass wool and rock wool.

[0057] Second implementation method:

[0058] Figure 3 , Figure 11-13An oil-immersed transformer with an intelligent temperature control system is shown. Based on the first embodiment, the mixing barrel 8 is a horizontally arranged cylindrical structure. An isolation barrel 21 is fixedly connected to the inner wall of the mixing barrel 8 on the side away from the push impeller 10. The isolation barrel 21 and the inner wall of the mixing barrel 8 enclose an annular cavity. A spiral guide vane 28 is fixedly connected to the inner side of the isolation barrel 21. An annular baffle 22 that divides the annular cavity is fixedly connected to the outer wall of the isolation barrel 21 on the side away from the spiral guide vane 28. The mixing barrel 8 is located below the annular baffle 22 and is fixedly connected to a slag discharge cover 23 that is connected to the annular cavity. The lower end of the slag discharge cover 23 is fixedly connected to a waste slag box 24.

[0059] A slag discharge hole 2101 connected to the annular cavity is provided on the isolation cylinder 21, and a reflux hole 2102 is provided on the right side of the annular baffle 22. A vertical baffle 25 extending to the lower end of the slag discharge cover 23 is fixedly connected below the annular baffle 22, and the vertical baffle 25 divides the inner cavity of the slag discharge cover 23 into two independent cavities on the left and right; a first viscosity sensor 16 is provided at the connection point between the upper outflow cavity and the upper heat dissipation pipe 7, and a second viscosity sensor 18 is provided at the connection point between the lower outflow cavity and the lower heat dissipation pipe 9. Both the first viscosity sensor 16 and the second viscosity sensor 18 are connected to the input end of the monitoring module.

[0060] For details, please refer to Fig.13 When the insulating oil produces more precipitated impurities due to thermal decomposition, its viscosity gradually increases. When the viscosity is high, the flow rate of the insulating oil gradually decreases, resulting in reduced heat dissipation efficiency. In order to remove the precipitated impurities in the insulating oil, when the first viscosity sensor 16 or the second viscosity sensor 18 detects that the viscosity of the insulating oil is higher than the set viscosity threshold at the same temperature (detected by the first temperature sensor 15 and the second temperature sensor 17), the controller 20 starts the dual-axis motor 11 to make the insulating oil flow horizontally in the mixing barrel 8. When the insulating oil contacts the spiral guide vane 28, the insulating oil flows horizontally in the spiral guide vane 28. Under the guidance of the swirl guide plate 28, the insulating oil generates a swirl in the mixing cylinder 8, and then under the action of centrifugal force, the precipitated impurities move to the inner wall of the isolation cylinder 21 and enter the annular cavity through the slag discharge hole 2101, and then enter the waste slag box 24 through the slag discharge cover 23. The precipitated impurities are precipitated and collected in the waste slag box 24, and the precipitated insulating oil flows into the cavity of the annular cavity on the right side of the annular baffle 22 through the channel of the slag discharge cover 23 on the right side of the vertical baffle 25, and then flows back to the isolation cylinder 21 through the reflux hole 2102, and then is discharged into the nozzle 19 through the mixing cylinder 8 again.

[0061] Compared with the traditional oil-immersed transformer, the present invention centrifugally separates the precipitated impurities in the insulating oil through the isolation cylinder 21 arranged in the mixing cylinder 8 and the slag discharge hole 2101 and the reflux hole 2102 opened on the isolation cylinder 21, and through the slag discharge cover 23 and the waste slag box 24 and the vertical baffle 25 arranged in the slag discharge cover 23, the separated precipitated impurities are precipitated and gathered in the waste slag box 24, the insulating oil is continuously purified, and the purified insulating oil is returned to the immersion cavity, thereby reducing the viscosity of the insulating oil, improving the heat exchange and heat dissipation efficiency, and extending the service life of the insulating oil.

[0062] See also Fig.13 The isolation tube 21 is a hollow cylindrical structure with a trumpet-shaped opening at the front end. A spiral cavity is formed between the spiral guide vane 28 and the inner wall of the isolation tube 21. There are multiple slag discharge holes 2101 and they are evenly distributed in a spiral. There are multiple reflux holes 2102 and they are arranged in an inclined radial pattern. The opening of the reflux hole 2102 faces the side away from the spiral guide vane 28.

[0063] Specifically, the push impeller 10 pushes the insulating oil containing precipitated impurities into the trumpet-shaped opening of the isolation cylinder 21, so that the insulating oil can more easily form a vortex in the spiral cavity, thereby accelerating the separation of the precipitated impurities from the insulating oil, and most of the insulating oil with less impurities flows out directly through the central axis position of the isolation cylinder 21, thereby improving the precipitation removal efficiency and removal effect of the insulating oil; in addition, the multiple reflux holes 2102 arranged in an inclined radial shape, since the insulating oil in the middle of the isolation cylinder 21 has a larger flow rate, and the insulating oil flowing into the waste slag box 24 through the annular cavity with the precipitated impurities flows more slowly, according to the Bernoulli fluid law, the fluid with a large flow rate has a small pressure, and the pressure inside the reflux hole 2102 is less than the pressure outside, and the isolation cylinder 21 sucks the insulating oil in the waste slag box 24 through the reflux hole 2102 to slow down the reflux of the insulating oil.

[0064] See also Figure 11-13 A filter plate 26 fixedly connected to the lower end of the vertical baffle 25 is provided on the upper part of the waste slag box 24. The filter plate 26 is arc-shaped and the lower end is fixedly connected to the right inner wall of the waste slag box 24. A filter screen 27 is fixedly connected inside the filter plate 26.

[0065] Specifically, the cavity on the right side of the vertical baffle 25 is sealed by the filter plate 26, and the insulating oil is filtered by the filter screen 27 to reduce the precipitated impurities with the reflux of the insulating oil and improve the impurity precipitation effect.

[0066] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An oil-immersed transformer with an intelligent temperature control system, characterized in that: The invention comprises a shell (1) and an iron core winding (2), wherein the upper and lower ends of the iron core winding (2) are fixedly connected to the inner walls of the front and rear ends of the shell (1) through a pair of symmetrically arranged mounting plates (3), a partition (4) fixedly connected to the shell (1) is provided on the side of the mounting plate (3) away from the iron core winding (2), an infiltration cavity is formed between the inner end surfaces of the pair of partitions (4) and the inner wall of the shell (1), and the infiltration cavity is filled with insulating oil, and an upper outflow cavity and a lower outflow cavity distributed up and down are respectively formed between the outer end surfaces of the pair of partitions (4) and the inner wall of the shell (1), and a collector (5) used for collecting the insulating oil in the middle of the partition (4) and flowing it out to the upper outflow cavity or the lower outflow cavity is fixed at the center position of the pair of partitions (4); An upper heat dissipation pipe (7) in communication with the upper outflow chamber and a lower heat dissipation pipe (9) in communication with the lower outflow chamber are fixedly connected to the outer wall of the shell (1); the ends of the upper heat dissipation pipe (7) and the lower heat dissipation pipe (9) away from the shell (1) are fixedly connected to a same mixing barrel (8); the mixing barrel (8) is fixedly connected to the inner wall of the shell (1) and is in communication with the infiltration chamber; a pushing impeller (10) is provided in the mixing barrel (8) for pushing the insulating oil from the mixing barrel (8) to the infiltration chamber; the pushing impeller (10) is connected to a dual-axis motor (11) An output end, the outer end of the dual-axis motor (11) is fixedly connected to a mounting frame (12) sleeved on the outside of the mixing cylinder (8) and fixedly connected to the outer wall of the housing (1), the side of the mounting frame (12) away from the mixing cylinder (8) is fixedly connected to an air guide cylinder (13), and a heat dissipation impeller (14) fixedly connected to the other output end of the dual-axis motor (11) is installed in the air guide cylinder (13); the confluence plate (5) is provided with evenly distributed external through holes (501), and the interior of the confluence plate (5) is fixedly connected to a heating wire (502); The dual-axis motor (11) is electrically connected to a controller (20) fixed on a mounting frame (12); a temperature control system is mounted in the controller (20); the temperature control system comprises a control module; an input end of the control module is connected to a monitoring module; an input end of the monitoring module is respectively connected to a first temperature sensor (15) and a second temperature sensor (17); the first temperature sensor (15) is fixed at a connection point between an upper outflow cavity and an upper heat dissipation pipe (7); and the second temperature sensor (17) is fixed at a connection point between a lower outflow cavity and a lower heat dissipation pipe (9); and an output end of the control module is respectively connected to a mixing module and a heating module; the output end of the mixing module is connected to the dual-axis motor (11); and the output end of the heating module is connected to a heating wire (502).

2. The oil-immersed transformer with an intelligent temperature control system according to claim 1, characterized in that: The mixing cylinder (8) is a horizontally arranged cylindrical structure. An isolating cylinder (21) is fixedly connected to the inner wall of the mixing cylinder (8) on the side away from the push impeller (10). The isolating cylinder (21) and the inner wall of the mixing cylinder (8) enclose an annular cavity. A spiral guide vane (28) is fixedly connected to the inner side of the isolating cylinder (21). An annular baffle (22) for dividing the annular cavity is fixedly connected to the outer wall of the isolating cylinder (21) on the side away from the spiral guide vane (28). The mixing cylinder (8) is fixedly connected to a slag discharge cover (23) in communication with the annular cavity below the annular baffle (22). The lower end of the slag discharge cover (23) is fixedly connected to a waste slag box (24).

3. The oil-immersed transformer with an intelligent temperature control system according to claim 2, characterized in that: The isolation cylinder (21) is provided with a slag discharge hole (2101) connected to the annular cavity, and the isolation cylinder (21) is provided with a return hole (2102) at the right side of the annular baffle (22). A vertical baffle (25) extending to the lower end of the slag discharge cover (23) is fixedly connected below the annular baffle (22), and the vertical baffle (25) divides the inner cavity of the slag discharge cover (23) into two independent cavities on the left and right. A first viscosity sensor (16) is provided at the connection point between the upper outflow cavity and the upper heat dissipation pipe (7), and a second viscosity sensor (18) is provided at the connection point between the lower outflow cavity and the lower heat dissipation pipe (9). Both the first viscosity sensor (16) and the second viscosity sensor (18) are connected to the input end of the monitoring module.

4. The oil-immersed transformer with an intelligent temperature control system according to claim 1, characterized in that: The mixing cylinder (8) is fixedly connected to the infiltration chamber at a point where it is connected to a nozzle (19) arranged outside the core winding (2); the nozzle (19) is provided with a pair of spray holes facing the left and right side walls of the core winding (2); a pair of guide columns (6) for guiding insulating oil to the middle gap of the core winding (2) are fixedly connected between the pair of mounting plates (3); an inner through hole (301) is provided at a portion of the mounting plate (3) located between the guide columns (6) and the core winding (2); and a rectangular gap (302) for insulating oil to flow is formed between the pair of mounting plates (3) and the left inner wall and the right inner wall of the housing (1).

5. The oil-immersed transformer with an intelligent temperature control system according to claim 4, characterized in that: The guide column (6) is a prism-shaped structure with a triangular cross section and a tip facing the middle gap of the iron core winding (2). The outer end surface of the guide column (6) is fixedly connected to the inner wall of the infiltration cavity. The nozzle (19) is a three-way pipe and has an overall U-shaped structure. The nozzle (19) passes through the guide column (6).

6. The oil-immersed transformer with an intelligent temperature control system according to claim 1, characterized in that: The upper heat dissipation pipe (7) comprises a plurality of branch pipes (701) which are linearly and equidistantly distributed and fixedly connected to the outer shell (1); the branch pipes (701) are connected to the outflow cavity located on the upper side via a connecting hole (101) provided on the outer shell (1); the lower ends of the branch pipes (701) are fixedly connected to a main pipe (702); the middle part of the lower end of the main pipe (702) is fixedly connected to a filling pipe (703); the filling pipe (703) is connected to the mixing cylinder (8); the lower heat dissipation pipe (9) has the same structure as the upper heat dissipation pipe (7) and is arranged opposite to each other.

7. The oil-immersed transformer with an intelligent temperature control system according to claim 1, characterized in that: The installation frame (12) is a U-shaped frame structure with an opening at the right end. The installation frame (12) and the outer wall of the outer shell (1) enclose a rectangular cavity with front and rear openings. The parts of the installation frame (12) and the air guide tube (13) facing each other are provided with ventilation holes that are evenly distributed and connect the rectangular cavity and the inner cavity of the air guide tube (13).

8. The oil-immersed transformer with an intelligent temperature control system according to claim 3, characterized in that: The isolation cylinder (21) is a hollow cylindrical structure with a trumpet-shaped opening at the front end. A spiral cavity is formed between the spiral guide plate (28) and the inner wall of the isolation cylinder (21). The number of slag discharge holes (2101) is multiple and is equidistantly distributed in a spiral pattern. The number of reflow holes (2102) is multiple and is arranged in an inclined radial pattern. The opening of the reflow hole (2102) faces the side away from the spiral guide plate (28).

9. The oil-immersed transformer with an intelligent temperature control system according to claim 3, characterized in that: The waste slag box (24) is provided with a filter plate (26) fixedly connected to the lower end of the vertical baffle (25) at the upper part, the filter plate (26) is arc-shaped and the lower end is fixedly connected to the right inner wall of the waste slag box (24), and a filter screen (27) is fixedly connected inside the filter plate (26).

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