A temperature rise balancing structure and balancing method for upper and lower coils of a transformer

Abstract

The present invention discloses a temperature rise balancing structure and a balancing method for the upper and lower coils of a transformer, and belongs to the technical field of transformer cooling. A temperature rise balancing structure for the upper and lower coils of a transformer comprises a housing and a transformer body arranged in the housing, wherein the transformer body comprises an upper winding and a lower winding; an air duct structure for air intake is arranged between the bottom of the coaxial upper winding and the top of the lower winding; an axial air duct is arranged inside the upper winding and the lower winding; the present invention, by arranging an air duct structure with an air duct between the upper winding and the lower winding, can inhale new cold air from the air duct of the air duct structure into the axial air duct of the upper winding, thereby strengthening the heat dissipation of the upper winding, making the temperature rise of the upper and lower windings relatively balanced, thereby solving the problem of large temperature rise difference between the upper and lower coils of the axially split transformer in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of transformer cooling, and in particular to a temperature rise balancing structure of upper and lower coils of a transformer and a balancing method thereof. Background Art

[0002] Conventional dry-type transformer axially split products have a very large difference in temperature rise of each axially arranged winding. For example, in double-split products, since the hot air generated by the winding is discharged from the lower coil upward through the air duct, the temperature rise of the upper winding is about 1.4 times higher than that of the lower winding.

[0003] Due to the consistency of other parameter requirements of the upper and lower windings, there is no good way to deal with this problem. The temperature can only be reduced based on the temperature rise of the upper coil, while the temperature rise of the lower winding is very low, which greatly wastes the cooling cost. When the product has an ultra-high height, the phenomenon of uneven temperature rise of the axial winding is more serious.

[0004] Therefore, in this scheme, a heat dissipation structure is proposed to solve the problem of large temperature rise difference between the upper and lower coils of the axially split transformer. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of large temperature rise difference between upper and lower coils of an axially split transformer in the prior art, and to propose a temperature rise balancing structure and a balancing method for the upper and lower coils of a transformer.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A temperature rise balancing structure for upper and lower coils of a transformer, comprising a shell and a transformer body arranged in the shell, the transformer body comprising an upper winding and a lower winding; a duct structure for air intake is arranged between the bottom of the coaxial upper winding and the top of the lower winding; axial ducts are arranged inside the upper winding and the lower winding; a blowing system is arranged at the bottom of the transformer body, and the blowing system is used to accelerate the gas flow rate in the axial duct; the duct structure can adaptively adjust the duct size of the duct structure according to the gas flow rate in the axial duct; a wind shield is arranged inside the shell, and it is located above the duct structure, and the wind shield divides the interior of the shell into an upper chamber and a lower chamber; a cooler is arranged on the back of the shell, the air exhaust port of the cooler is connected to the upper chamber, and cooperates with the blowing system to accelerate the gas flow rate in the axial duct, and the air outlet system of the cooler is connected to the lower chamber.

[0008] Preferably, the transformer body further comprises an iron core, the top and the bottom of the iron core are fixed by clamps, and the air blowing system is arranged on the clamp located at the bottom.

[0009] Preferably, the blowing system comprises a plurality of axial flow fans, wherein the axial flow fans are fixedly arranged on a clamp located at the lower portion, and outlets of the axial flow fans are aligned with the lower windings and blow air toward the axial air duct.

[0010] Preferably, the air duct structure includes a fixing frame, which is fixedly arranged between the upper winding and the lower winding, and three fixed guide plates are arranged on the fixing frame to form a first air duct and a second air duct, and there are two first air ducts, which are respectively located above and below the second air duct.

[0011] Preferably, the air duct structure also includes a floating guide plate, which is located in the second air duct, and sliding rods are fixedly provided at both ends of the floating guide plate. A first slide is opened on the inner side of both ends of the fixed frame, and the sliding rod is slidably arranged in the first slide. The floating guide plate can move up and down according to the gas flow rate passing through the second air duct.

[0012] Preferably, the air duct structure further includes a movable guide plate, two of which are provided, corresponding to two first air ducts respectively, the movable guide plate is located in the first air duct, and the movable guide plate can move up and down with the floating guide plate to open or close the first air duct.

[0013] Preferably, sliders are fixedly provided at both ends of the movable guide plate, a second slide is provided on the sliding rod, an expansion column is fixedly provided on the inner bottom of the second slide, the bottom surface of the slider is fixedly connected to the top of the expansion column, and the slider is located in the second slide.

[0014] Preferably, the expansion column includes a fixed cylinder, a sliding column and an elastic air storage portion, the elastic air storage portion is arranged in the inner lower part of the fixed cylinder, the sliding column is slidably arranged in the inner upper part of the fixed cylinder, and the top end of the sliding column is fixedly connected to the slider.

[0015] Preferably, the air outlet system includes an air outlet arranged at the lower part of the cooler and an air outlet duct fixedly arranged on the bottom surface of the wind shield plate, and the outlet direction of the air outlet duct is obliquely downward and faces the air duct of the air duct structure.

[0016] A method for balancing the temperature rise of upper and lower coils of a transformer comprises the following steps:

[0017] Step 1: Use a cooler to extract hot air from the upper chamber of the housing and input cold air into the lower chamber of the housing;

[0018] Step 2: Use an axial flow fan to blow the cold air entering the lower chamber from the bottom of the lower winding into the axial air duct, and finally enter the upper chamber from the top of the upper winding and be drawn away by the cooler to dissipate heat for the upper and lower windings;

[0019] Step 3: When the axial flow fan supplies air to dissipate heat for the upper winding and the lower winding, a portion of the cooling air can be driven through the air duct of the air duct structure into the axial air duct for heat dissipation;

[0020] Step 4: When the temperature of the position where the upper winding and the lower winding are close to each other increases, the elastic air storage part expands due to the heat, and the slider is lifted to make the movable guide plate open the first air duct, thereby increasing the air intake volume of the air duct structure;

[0021] Step 5: When the temperature of the position where the upper winding and the lower winding are close to each other further increases, the rotation speed of the axial flow fan is increased, the air flow rate of the air duct structure is further increased, and the cooling of the upper winding is accelerated.

[0022] Compared with the prior art, the present invention provides a temperature rise balancing structure and a balancing method for upper and lower coils of a transformer, which have the following beneficial effects.

[0023] The present invention provides an air duct structure with an air duct between the upper winding and the lower winding. On the one hand, it can play a guiding role when the blowing system accelerates the flow rate of the axial air duct to prevent gas from dissipating from between the upper winding and the lower winding. On the other hand, when the flow rate of the axial air duct is accelerated, new cold air can be sucked from the air duct of the air duct structure into the axial air duct of the upper winding, thereby enhancing the heat dissipation of the upper winding and making the temperature rise of the upper and lower windings relatively balanced, thereby solving the problem of large difference in temperature rise between the upper and lower coils of the axially split transformer in the prior art.

[0024] The wind shield provided in the present invention is used to block the cold air entering the lower chamber, preventing the cold air from being directly drawn away, so that the cold air can stay in the lower chamber for a longer time, thereby making the wind blown into the axial air duct by the blowing system be cold air, achieving better cooling and heat dissipation effects.

[0025] The present invention arranges an air outlet duct on the bottom surface of the wind shield and aligns the outlet of the air outlet duct with the air duct of the air duct structure. When gas is sucked into the air duct of the air duct structure, new cold air blown out of the air outlet duct can be sucked in first, thereby further improving the cooling effect of the upper winding.

[0026] Other advantages, objectives and features of the present invention will be described in part in the following description; and in part, will be apparent to those skilled in the art based on an examination of the following; or, may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0029] Figure 3 It is a schematic diagram of the structure of the equipment inside the shell in the present invention.

[0030] Figure 4 It is a schematic diagram of the partial cross-sectional structure of the equipment inside the shell in the present invention.

[0031] Figure 5 For the present invention Figure 4 Enlarged structural diagram at A in the middle.

[0032] Figure 6 It is a structural schematic diagram of the transformer main body and the air duct structure in the present invention.

[0033] Figure 7 It is a structural schematic diagram of the air duct structure in the present invention.

[0034] Figure 8 It is a schematic diagram of the cross-sectional structure of the air duct structure in the present invention.

[0035] Fig. 9 It is a schematic diagram of the split structure of the air duct structure in the present invention.

[0036] Fig.10 It is a schematic diagram of the structure of the fixing frame in the present invention.

[0037] Fig.11 It is a structural schematic diagram of the first air duct structure of the air duct structure of the present invention in an open state.

[0038] Fig.12 It is a schematic cross-sectional structure diagram of the air duct structure of the present invention in the open state of the first air duct.

[0039] Fig.13 It is a structural schematic diagram of the expansion column in the present invention.

[0040] Fig.14 It is a schematic diagram of the cross-sectional structure of the expansion column in the present invention.

[0041] In the figure:

[0042] 1. Casing; 2. Cooler; 3. Cooling fan; 4. Upper winding; 5. Air outlet duct; 6. Pad; 7. Lower winding; 8. Axial fan; 9. Clamp; 10. Floating guide plate; 11. Fixed frame; 12. Air outlet; 13. Wind shield; 14. Air exhaust port; 15. Iron core; 16. Axial air duct; 17. Movable guide plate; 18. Fixed guide plate; 19. First slide; 20. Second slide; 21. Fixed cylinder; 22. Sliding rod; 23. Sliding block; 24. Sliding column; 25. Elastic air storage unit; 26. First air duct; 27. Second air duct. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] Reference Figure 1-14 A temperature rise balancing structure for upper and lower coils of a transformer includes a housing 1 and a transformer body arranged in the housing 1, wherein the transformer body includes an upper winding 4 and a lower winding 7.

[0045] An air duct structure for air intake is provided between the bottom of the coaxial upper winding 4 and the top of the lower winding 7 .

[0046] Axial air ducts 16 are provided inside the upper winding 4 and the lower winding 7 .

[0047] An air blowing system is provided at the bottom of the transformer body, and the air blowing system is used to accelerate the gas flow rate in the axial air duct 16 .

[0048] The air duct structure can adaptively adjust the air duct size of the air duct structure according to the gas flow rate in the axial air duct 16 .

[0049] A windshield 13 is provided inside the housing 1 and is located above the air duct structure. The windshield 13 divides the interior of the housing 1 into an upper chamber and a lower chamber.

[0050] A cooler 2 is provided at the back of the housing 1. The air suction port 14 of the cooler 2 is connected to the upper chamber and cooperates with the blowing system to accelerate the gas flow rate in the axial air duct 16. The air outlet system of the cooler 2 is connected to the lower chamber.

[0051] In a specific embodiment of the present invention, the cooler 2 is used to extract the hot air in the upper chamber of the housing 1, and after cooling it, it is sent into the lower chamber by the air outlet system; the blowing system is used to blow air upward from the bottom of the lower winding 7 to blow the cold air in the lower chamber into the axial air duct 16, thereby accelerating the gas flow rate inside the axial air duct 16 and using the cold air to take away the heat generated by the coil, and the temperature increases as it goes up. In this process, the air duct structure guides the gas to avoid the problem of the temperature of the lower chamber rising due to the gas floating out from the position between the upper winding 4 and the lower winding 7 and mixing with the cold air in the lower chamber, and the blowing system accelerates the gas flow rate inside the axial air duct 16. When the gas flow rate in the axial air duct 16 is high, the pressure in the axial air duct 16 will be lower than the external pressure. Therefore, new cold air can be sucked into the upper winding 4 from the air duct of the air duct structure. In this way, the heat dissipation efficiency in the upper winding 4 can be improved, and the temperature rise of the upper winding 4 and the lower winding 7 can be relatively balanced. By setting the air duct of the air duct structure to change the size of the air duct with the gas flow rate, the power of the blowing system can be increased at high temperatures, and the gas flow rate can be further increased while increasing the air duct ventilation volume of the air duct structure, so as to avoid the situation where new cold air cannot enter the axial air duct 16 of the upper winding 4 in large quantities after only increasing the gas flow rate.

[0052] In this embodiment, the upper winding 4 and the lower winding 7 have the same configuration. Taking the upper winding 4 as an example, it includes a high-voltage coil, an insulating tube and a low-voltage coil arranged in sequence from the outside to the inside. There are two high-voltage coils with different diameters, and there are two groups of low-voltage coils. Each group of low-voltage coils has four coils with different diameters. The two groups of low-voltage coils are arranged up and down and are coaxial. The ends close to each other are separated by a concave platform to avoid contact between the two. The common height of the two groups of low-voltage coils is equal to the height of the high-voltage coil; the insulating tube is arranged between the high-voltage coil and the low-voltage coil.

[0053] refer to Figure 5 The axial air duct 16 is as follows: the distance between the two high-voltage coils forms an axial air duct 16, the distance between the high-voltage coil and the insulating cylinder forms an axial air duct, the distance between the low-voltage coil and the insulating cylinder forms an axial air duct 16, and the distance between each low-voltage coil forms three axial air ducts 16, for a total of six axial air ducts 16. During operation, the heat generated by the coils is discharged through the corresponding axial air ducts 16. Due to the characteristic that hot air rises, the heat discharge port is located at the upper part of the upper winding 4.

[0054] The transformer body also includes an iron core 15, the top and bottom of the iron core 15 are fixed by clamps 9, and the blowing system is arranged on the clamps 9 located at the bottom; the specific structure of the iron core 15 and the method of fixing and splicing it by the clamps 9 adopt the existing conventional settings; however, in order to further improve the heat dissipation effect, a ventilation duct can also be arranged in the middle of the iron core 15, so as to make the heat dissipation effect of the iron core 15 better.

[0055] The air blowing system includes a plurality of axial flow fans 8 , which are fixedly arranged on a clamp 9 located at the lower portion. The outlets of the axial flow fans 8 are aligned with the lower winding 7 and blow air toward the axial air duct 16 .

[0056] In this solution, a total of eight axial flow fans 8 are provided, and all are fixedly arranged on the side of the lower clamp 9; when working, the axial flow fan 8 is started to blow air toward the bottom opening of the axial air duct 16 to accelerate the gas flow rate in the axial air duct 16, so that the heat generated by the coil is removed in time.

[0057] The air duct structure includes a fixing frame 11, which is fixedly arranged between the upper winding 4 and the lower winding 7. Three fixed guide plates 18 are arranged on the fixing frame 11 to form a first air duct 26 and a second air duct 27. There are two first air ducts 26, which are respectively located above and below the second air duct 27.

[0058] The cross-sections of the three fixed guide plates 18 are all in the form of inclined plates, and the channels of the first air duct 26 and the second air duct 27 formed therefrom are low at the outer ends and high at the inner ends. This arrangement can effectively prevent the gas in the axial air duct 16 from flowing outward from the first air duct 26 and the second air duct 27 when the gas flows from bottom to top. At the same time, since the flow velocity in the axial air duct 16 is fast and its pressure is lower than the external pressure, the external gas at the positions of the first air duct 26 and the second air duct 27 can be sucked into the axial air duct 16, thereby providing new cold air to enter, so that the cooling effect of the upper winding 4 is better, and the faster the flow velocity in the axial air duct 16, the faster the flow velocity of the sucked gas is.

[0059] The air duct structure also includes a floating guide plate 10, which is located in the second air duct 27. Sliding rods 22 are fixedly provided at both ends of the floating guide plate 10. First slides 19 are opened on the inner sides of both ends of the fixed frame 11. The sliding rods 22 are slidably set in the first slides 19. The floating guide plate 10 can move up and down according to the gas flow rate passing through the second air duct 27.

[0060] The upper winding 4 and the lower winding 7 are separated by four pads 6. The air duct structure is arc-shaped as a whole, and its two ends are fixedly arranged on the sides of two adjacent pads 6. There are three groups of air duct structures in total, and the outlet direction of the coil is not set.

[0061] The cross section of the floating guide plate 10 is similar to that of an airfoil, with an upper oblique side being an arc and a lower oblique side being a straight line. With such a configuration, when the gas is sucked into the axial air duct 16 through the second air duct 27, the gas flow rate below the floating guide plate 10 is smaller than the flow rate above it. Therefore, when the gas flow rate through the second air duct 27 is relatively high, the floating guide plate 10 can float upward; and since the size of the second air duct 27 remains unchanged, no matter where the floating guide plate 10 is located, it does not affect the flux of the second air duct 27.

[0062] The air duct structure also includes a movable guide plate 17. Two movable guide plates 17 are provided, corresponding to two first air ducts 26 respectively. The movable guide plates 17 are located in the first air ducts 26. The movable guide plates 17 can move up and down with the floating guide plate 10 to open or close the first air ducts 26.

[0063] The cross-section of the movable guide plate 17 is a vertical plate and an inclined plate, and the whole is roughly V-shaped. Under normal conditions, the movable guide plate 17 is located at the lower part of the first air duct 26, and the vertical plate of the movable guide plate 17 is used to block the first air duct 26, that is, to close the first air duct 26. When the movable guide plate 17 moves up with the floating guide plate 10, the first air duct 26 can leak out, and then the first air duct 26 is opened, thereby increasing the overall air duct flux of the air duct structure.

[0064] Slide blocks 23 are fixedly provided at both ends of the movable guide plate 17, a second slideway 20 is provided on the slide rod 22, an expansion column is fixedly provided at the inner bottom of the second slideway 20, the bottom surface of the slide block 23 is fixedly connected to the top of the expansion column, and the slide block 23 is located in the second slideway 20.

[0065] When the blowing system is enhanced and the gas flow rate in the axial air duct 16 is further accelerated, the flow rate through the second air duct 27 will also be accelerated, and then the floating guide plate 10 will move up, and then drive the sliding rod 22 to move upward in the first slide 19, so that the expansion column drives the movable guide plate 17 to move upward, and then opens the first air duct 26 to increase the flux of the air duct structure. In this way, when the temperature is high, the blowing system is used to accelerate the flow rate in the axial air duct 16 to accelerate heat dissipation, and at the same time increase the flux of the air duct structure, so that the new gas (the temperature is lower than the gas temperature in the axial air duct 16 at the same height) entering the upper winding 4 is sufficient, and the temperature rise of the upper winding 4 and the lower winding 7 is kept relatively balanced.

[0066] The expansion column includes a fixed cylinder 21 , a sliding column 24 and an elastic air storage portion 25 . The elastic air storage portion 25 is arranged at the inner lower part of the fixed cylinder 21 . The sliding column 24 is slidably arranged at the inner upper part of the fixed cylinder 21 . The top end of the sliding column 24 is fixedly connected to the slider 23 .

[0067] When the temperature at the position close to the upper winding 4 and the lower winding 7 is high, it means that the amount of gas entering from the air duct structure is insufficient, so the air intake there needs to be supplemented; the operation mode is as follows: after the temperature becomes higher, the gas in the elastic air storage part 25 expands due to the heat, so that the elastic air storage part 25 pushes the sliding column 24 upward, and then drives the movable guide plate 17 to move upward, thereby opening the first air duct 26 to increase the air intake.

[0068] The air outlet system includes an air outlet 12 arranged at the lower part of the cooler 2 and an air outlet duct 5 fixedly arranged on the bottom surface of the wind shield 13. The outlet direction of the air outlet duct 5 is obliquely downward and faces the air duct of the air duct structure.

[0069] The cooler 2 can adopt a water cooler, and a cooling fan 3 is arranged on the upper part thereof for exhausting air. The cooling fan 3 is used to extract the gas in the upper chamber from the exhaust port 14 and send it to the heat exchange part of the water cooler to take away the heat, so that the hot air is converted into cold air, and then the cold air is sent to the lower chamber from the air outlet 12; the air outlet duct 5 can be connected with part of the air outlet 12 by a pipeline, so that a part of the cold air is directly sent to the lower part of the lower chamber, and the other part is sent to the upper part of the lower chamber through the air outlet duct 5.

[0070] When gas is sucked into the axial air duct 16 from the air duct structure, most of the sucked gas is cold air just sent out from the air outlet duct 5. In this way, the temperature of the gas entering the upper winding 4 from the air duct structure is lower, achieving a better cooling effect on the upper winding 4, and further making the temperature rise of the upper winding 4 and the lower winding 7 relatively balanced.

[0071] Overall working process: Under normal conditions, the axial flow fan 8 and the cooler 2 are always started. The cooler 2 extracts the heat in the upper chamber and exchanges heat to form cold air, which is then sent into the lower chamber (note that at this time, under the obstruction of the wind shield 13, the cold air entering the lower chamber will not be directly extracted by the cooler 2), and the axial flow fan 8 blows the cold air entering the lower chamber from the bottom of the axial air duct 16, flowing from bottom to top, until it flows out from the top of the axial flow air duct 16 and enters the upper chamber. In this process, the axial flow fan 8 accelerates the gas flow rate in the axial air duct 16, so that the heat generated by the coil is quickly dissipated upward for cooling, and at the same time, under the action of the cold air, the cooling effect is further improved. At the same time, new cold air can also be inhaled from the second air duct 27, that is, the cold air just sent from the air outlet duct 5, to increase the amount of cold air entering the axial air duct 16 of the upper winding 4, thereby improving the cooling effect of the upper winding 4.

[0072] If the coil temperature at the position of the air duct structure is too high, the elastic air storage part 25 expands due to the heat, lifts up the sliding column 24, causes the movable guide plate 17 to rise, and then opens the first air duct 26, increases the air intake of the air duct structure, and improves the cooling effect of this place and the upper winding 4.

[0073] If the temperature is still not controlled on the basis of the above, the rotation speed of the axial flow fan 8 is increased to further increase the gas flow rate in the axial air duct 16 and accelerate the heat dissipation. At the same time, the gas flow rate in the second air duct 27 can also be increased, so that the floating guide plate 10 moves upward and drives the movable guide plate 17 to move upward, further opening the first air duct 26, so that the air intake of the air duct structure is larger and the gas sucked in is more sufficient, thereby avoiding the problem of a large temperature difference between the upper winding 4 and the lower winding 7 due to insufficient air intake at this location.

[0074] A method for balancing the temperature rise of upper and lower coils of a transformer comprises the following steps:

[0075] Step 1: Use the cooler 2 to extract the hot air in the upper chamber of the housing 1 and input cold air into the lower chamber of the housing 1;

[0076] Step 2: Use the axial flow fan 8 to blow the cold air entering the lower chamber from the bottom of the lower winding 7 into the axial air duct 16, and finally enter the upper chamber from the top of the upper winding 4, and be drawn away by the cooler 2 to dissipate heat for the upper winding 4 and the lower winding 7;

[0077] Step 3: When the axial flow fan 8 supplies air to dissipate heat for the upper winding 4 and the lower winding 7, a portion of the cooling air can be driven to pass through the air duct of the air duct structure into the axial air duct 16 for heat dissipation;

[0078] Since the internal flow velocity of the axial air duct 16 is faster than the external flow velocity, the internal pressure of the axial air duct 16 is lower than the external pressure, so that the cold air blown out from the air outlet duct 5 can be sucked from the air duct of the air duct structure, and then the cold air entering the axial air duct 16 of the upper winding 4 is more sufficient, so that the temperature of the upper winding 4 and the lower winding 7 are similar;

[0079] At the same time, under the action of the wind shield 13 , the cold air entering the housing 1 is prevented from being directly drawn away by the cooler 2 , so that the cold air can stay in the lower chamber longer and can fully enter the axial air duct 16 .

[0080] Step 4: When the temperature of the position where the upper winding 4 and the lower winding 7 are close to each other rises, the elastic air storage part 25 expands due to the heat, and the slider 23 is lifted up so that the movable guide plate 17 opens the first air duct 26, thereby increasing the air intake of the air duct structure; more cold air enters the upper winding 4, thereby improving the cooling effect;

[0081] Step 5: When the temperature of the position where the upper winding 4 and the lower winding 7 are close to each other further increases, the rotation speed of the axial flow fan 8 is increased to further increase the air flow of the air duct structure, thereby accelerating the cooling of the upper winding 4;

[0082] Increasing the rotation speed of the axial flow fan 8 makes the gas flow rate in the axial air duct 16 faster. At this time, the flow rate at the air duct position passing through the air duct structure will also be accelerated, so that the floating guide plate 10 can move upward, and then drive the movable guide plate 17 to further open the first air duct 26, further increase the air intake there, and then quickly cool the upper winding 4.

[0083] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0085] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A temperature rise balancing structure for upper and lower coils of a transformer, comprising a housing (1) and a transformer body arranged in the housing (1), characterized in that: The transformer body comprises an upper winding (4) and a lower winding (7); An air duct structure for air intake is provided between the bottom of the coaxial upper winding (4) and the top of the lower winding (7); Axial air ducts (16) are provided inside the upper winding (4) and the lower winding (7); An air blowing system is provided at the bottom of the transformer body, and the air blowing system is used to accelerate the gas flow rate in the axial air duct (16); The air duct structure can adaptively adjust the air duct size of the air duct structure according to the gas flow rate in the axial air duct (16); A windshield (13) is provided inside the housing (1) and is located above the air duct structure, and the windshield (13) divides the interior of the housing (1) into an upper chamber and a lower chamber; A cooler (2) is provided at the back of the housing (1); an air suction port (14) of the cooler (2) is in communication with the upper chamber and cooperates with an air blowing system to accelerate the gas flow rate in the axial air duct (16); and an air outlet system of the cooler (2) is in communication with the lower chamber; The cooler (2) is used to extract the hot air in the upper chamber, cool it, and then send it into the lower chamber through the air outlet system; the blowing system is used to blow air upward from the bottom of the lower winding (7) to blow the cold air in the lower chamber into the axial air duct (16), thereby accelerating the gas flow rate in the axial air duct (16) and using the cold air to take away the heat generated by the coil. When the blowing system accelerates the gas flow rate in the axial air duct (16), the pressure in the axial air duct (16) will be lower than the pressure outside the axial air duct, so that new cold air can be sucked from the air duct of the air duct structure into the upper winding (4), thereby improving the heat dissipation efficiency in the upper winding (4) and achieving a relatively balanced temperature rise between the upper winding (4) and the lower winding (7).

2. The temperature rise balancing structure of the upper and lower coils of a transformer according to claim 1, characterized in that: The transformer body also includes an iron core (15), the top and bottom of the iron core (15) are fixed by clamps (9), and the air blowing system is arranged on the clamp (9) located at the bottom.

3. The temperature rise balancing structure of the upper and lower coils of a transformer according to claim 2, characterized in that: The air blowing system comprises a plurality of axial flow fans (8), wherein the axial flow fans (8) are fixedly arranged on a clamp (9) located at the bottom, and the outlets of the axial flow fans (8) are aligned with the lower winding (7) and blow air towards the axial air duct (16).

4. The temperature rise balancing structure of the upper and lower coils of a transformer according to claim 3, characterized in that: The air duct structure comprises a fixing frame (11), the fixing frame (11) being fixedly arranged between the upper winding (4) and the lower winding (7), the fixing frame (11) being provided with three fixed guide plates (18) to form a first air duct (26) and a second air duct (27), and the first air duct (26) having two portions, which are respectively located above and below the second air duct (27).

5. The temperature rise balancing structure of the upper and lower coils of a transformer according to claim 4, characterized in that: The air duct structure further comprises a floating guide plate (10), the floating guide plate (10) being located in the second air duct (27), sliding rods (22) being fixedly arranged at both ends of the floating guide plate (10), first slideways (19) being provided on the inner sides of both ends of the fixed frame (11), the sliding rods (22) being slidably arranged in the first slideways (19), and the floating guide plate (10) being able to move up and down according to the flow rate of gas passing through the second air duct (27).

6. The temperature rise balancing structure of the upper and lower coils of a transformer according to claim 5, characterized in that: The air duct structure further comprises a movable guide plate (17), two movable guide plates (17) are provided, respectively corresponding to two first air ducts (26), the movable guide plate (17) is located in the first air duct (26), and the movable guide plate (17) can move up and down with the floating guide plate (10) to open or close the first air duct (26).

7. The temperature rise balancing structure of the upper and lower coils of a transformer according to claim 6, characterized in that: Slide blocks (23) are fixedly provided at both ends of the movable guide plate (17), a second slideway (20) is provided on the slide rod (22), an expansion column is fixedly provided at the inner bottom of the second slideway (20), the bottom surface of the slide block (23) is fixedly connected to the top of the expansion column, and the slide block (23) is located in the second slideway (20).

8. The temperature rise balancing structure of the upper and lower coils of a transformer according to claim 7, characterized in that: The expansion column comprises a fixed cylinder (21), a sliding column (24) and an elastic gas storage portion (25); the elastic gas storage portion (25) is arranged at the inner lower portion of the fixed cylinder (21); the sliding column (24) is slidably arranged at the inner upper portion of the fixed cylinder (21); and the top end of the sliding column (24) is fixedly connected to the sliding block (23).

9. The temperature rise balancing structure of the upper and lower coils of a transformer according to claim 1, characterized in that: The air outlet system comprises an air outlet (12) arranged at the bottom of the cooler (2) and an air outlet duct (5) fixedly arranged on the bottom surface of the wind shield (13); the outlet direction of the air outlet duct (5) is obliquely downward and faces the air duct of the air duct structure.

10. A method for balancing the temperature rise of upper and lower coils of a transformer, using the temperature rise balancing structure as claimed in claim 8 to achieve the temperature rise balancing of the upper and lower coils of the transformer, characterized in that: The steps include: Step 1: using a cooler (2) to extract hot air from the upper chamber of the housing (1) and input cold air into the lower chamber of the housing (1); Step 2: using an axial flow fan (8) to blow the cold air entering the lower chamber from the bottom of the lower winding (7) into the axial air duct (16), and finally enter the upper chamber from the top of the upper winding (4) and be drawn away by the cooler (2), thereby dissipating heat from the upper winding (4) and the lower winding (7); Step 3: When the axial flow fan (8) supplies air to dissipate heat for the upper winding (4) and the lower winding (7), a portion of the cooling air can be driven through the air duct of the air duct structure into the axial air duct (16) for heat dissipation; Step 4: When the temperature of the position where the upper winding (4) and the lower winding (7) are close to each other increases, the elastic air storage portion (25) expands due to the heat, and the slider (23) is lifted up so that the movable guide plate (17) opens the first air duct (26), thereby increasing the air intake volume of the air duct structure; Step 5: When the temperature of the position where the upper winding (4) and the lower winding (7) are close to each other further increases, the rotation speed of the axial flow fan (8) is increased to further increase the air flow rate of the air duct structure, thereby accelerating the cooling of the upper winding (4).

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