An energy-saving dry-type transformer

Abstract

The present invention belongs to the technical field of dry-type transformers, and specifically relates to an energy-saving dry-type transformer, comprising a transformer body and connecting brackets fixedly arranged at the upper and lower ends thereof, the transformer body comprising an iron core, a low-voltage winding and a high-voltage winding, the low-voltage winding and the high-voltage winding are spaced apart and form a cooling air duct, an insulating cylinder is coaxially arranged in the cooling air duct, the insulating cylinder and the high-voltage winding together form a first heat dissipation air duct, the inner circle of the insulating cylinder and the low-voltage winding together form a second heat dissipation air duct, a first air guide shell is arranged on the outer circle surface of the insulating cylinder, the first air guide shell and the insulating cylinder together form a closed first annular chamber, the first annular chamber and the first heat dissipation air duct are jointly connected to a first heat dissipation fan, and a second air guide shell is arranged on the inner circle surface of the insulating cylinder. The technical solution of the present invention can effectively solve the problem that when the current dry-type transformer is working, the cooling air duct between the high-voltage winding and the low-voltage winding cannot evenly and effectively dissipate the heat of both.

Description

Technical Field

[0001] The invention belongs to the technical field of dry-type transformers, and in particular relates to an energy-saving dry-type transformer. Background Art

[0002] Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, CNC machinery and equipment and other places. Simply put, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil. Because the heat inside the transformer is very large and the heat dissipation is not timely, the working efficiency of the transformer is affected, and it needs to be cooled. The cooling methods are divided into natural air cooling and forced air cooling. During natural air cooling, the transformer can operate continuously for a long time at rated capacity. During forced air cooling, the surface of the transformer winding can be quickly cooled to increase its service life. However, in actual work, the convection heat dissipation effect of air cooling is limited. If the outside temperature is too high, the air cooling effect is even more negligible, and the transformer cannot be cooled down in time and effectively.

[0003] To this end, a Chinese patent discloses a heat dissipation structure for a dry-type transformer (patent publication number: CN117672673A). Through the gas-liquid conversion of the phase change coolant in the copper heat pipe, the heat generated by the winding absorbed by the heat conduction plate is quickly transferred to the heat dissipation fins of the cooling device. The heat dissipation fins can also ensure that the heat transferred here by the copper heat pipe is quickly absorbed, thereby ensuring that the temperature at the end of the copper heat pipe is always lower than the temperature at the heat conduction plate, thereby ensuring that the above-mentioned heat transfer process can be carried out continuously and efficiently, and finally achieving temperature control of the dry-type transformer.

[0004] Although the above technical scheme realizes the temperature control of the dry-type transformer, the heat of the winding is absorbed by the heat transfer device and transferred to the heat conduction plate, and then the heat is dissipated through the copper heat pipe and heat dissipation fins and other components. The heat on the surface of the winding needs to be conducted multiple times before it can be cooled. It is not directly cooling the heat source, and the cooling effect is not ideal. In the actual working process, the heat source of the dry-type transformer is mainly the iron core and the winding. The winding generates heat due to the resistance loss caused by the passage of current, and the iron core generates heat due to the hysteresis loss and eddy current loss caused by the change of magnetic flux. Among them, the high-voltage winding and the low-voltage winding are particularly prone to generate and accumulate heat. The above patent and most of the current patents cannot effectively solve the problem of heat accumulation and poor heat dissipation between the high-voltage winding and the low-voltage winding. Even if there is a cooling air duct between the current high-voltage winding and the low-voltage winding for cooling (combined with the attached Figure 1As shown in the figure, the airflow direction in the cooling air duct is from bottom to top, which often leads to lower temperature near the inlet end of the cooling air duct and higher temperature near the outlet end of the cooling air duct, and does not have the effect of cooling the entire high-voltage winding and low-voltage winding. Therefore, we propose an energy-saving dry-type transformer to solve this technical problem. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an energy-saving dry-type transformer, which is used to solve the problem that the cooling air duct between the high-voltage winding and the low-voltage winding cannot effectively dissipate heat evenly for the two when the dry-type transformer is working.

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

[0007] An energy-saving dry-type transformer comprises a transformer body and connecting brackets fixedly arranged at the upper and lower ends thereof, the transformer body comprises an iron core and a low-voltage winding and a high-voltage winding sequentially sleeved on the outside of the iron core from the inside to the outside, the low-voltage winding and the high-voltage winding are spaced apart and form an annular cooling air duct, a vertical heat-insulating cylinder is coaxially arranged in the cooling air duct, the heat-insulating cylinder is fixedly arranged on the connecting bracket, and the surface of the heat-insulating cylinder is spaced apart from the surfaces of the low-voltage winding and the high-voltage winding, the outer ring surface of the heat-insulating cylinder and the surface of the high-voltage winding together form an annular first heat dissipation air duct, the inner ring surface of the heat-insulating cylinder and the surface of the low-voltage winding together form an annular second heat dissipation air duct, the outer ring surface of the heat-insulating cylinder is spaced apart from an annular first air guide shell, and the first air guide shell and the heat-insulating cylinder together form a closed first annular chamber The first air-guiding shell is provided with a plurality of air-guiding ports connected to the interior of the first annular chamber on the peripheral surface close to the high-voltage winding, the first annular chamber and the first heat dissipation air duct are commonly connected to the first heat dissipation fan, the inner ring surface of the thermal insulation cylinder is provided with an annular second air-guiding shell at intervals, the second air-guiding shell and the thermal insulation cylinder together form a closed second annular chamber, and the surface of the second air-guiding shell close to the low-voltage winding is provided with an air-guiding port, the second annular chamber and the second heat dissipation air duct are commonly connected to the second heat dissipation fan, the first heat dissipation fan and the second heat dissipation fan are both fixed on the surface of the connecting bracket, wherein the airflows generated by the first heat dissipation fan and the second heat dissipation fan flow through the first heat dissipation air duct and the second heat dissipation air duct in different directions up and down, and respectively dissipate the corresponding high-voltage winding and low-voltage winding surfaces.

[0008] Furthermore, a plurality of vertical first dividing blocks are provided on the circumferential side surface of the first air guiding shell facing the high-voltage winding, and the plurality of first dividing blocks are evenly spaced around the vertical axis of the first air guiding shell, and one end of each of the first dividing blocks away from the first air guiding shell abuts against the surface of the high-voltage winding, and a plurality of air guiding openings between any two adjacent first dividing blocks are spaced apart in the vertical direction; a plurality of vertical second dividing blocks are provided on the surface of the second air guiding shell facing the low-voltage winding, and the second dividing blocks are evenly spaced around the vertical axis of the second air guiding shell, one side surface of each of the second dividing blocks abuts against the surface of the low-voltage winding, and a plurality of air guiding openings between any two adjacent second dividing blocks are spaced apart in the vertical direction.

[0009] Furthermore, each of the air guide ports is movably provided with a plurality of swing blades, and the plurality of swing blades in the air guide ports are evenly spaced in the vertical direction, each of the swing blades is rotatably connected to the surface of the first air guide housing and the second air guide housing, and each of the swing blades is connected to a driving component that drives it to swing back and forth in a vertical plane, and the driving component is fixed on the surface of the connecting bracket, wherein when the airflow in the first annular chamber and the second annular chamber passes through the air guide port, each swing blade is driven by the driving component to make the airflow at the air guide port swing back and forth in the vertical plane.

[0010] Furthermore, one end surface of the heat insulation cylinder passes through the cooling air channel and is connected to a first drive motor that drives it to rotate around a vertical axis, and the first drive motor is fixedly arranged on the surface of the connecting bracket.

[0011] Further, on the horizontal plane, each of the first dividing blocks and the second dividing blocks are arranged alternately and at intervals along the annular direction.

[0012] Furthermore, outlet ends of the first heat dissipation fan and the second heat dissipation fan are both connected to a cooling component, and the cooling component is fixedly arranged on the surface of the connecting bracket.

[0013] Furthermore, a plurality of through-channels for heat insulation are provided inside the heat-insulating cylinder, each of the through-channels is vertically arranged, and two ends of the through-channels respectively pass through the upper and lower end surfaces of the heat-insulating cylinder.

[0014] The beneficial effects of the present invention are:

[0015] 1. The present invention arranges an insulating cylinder in the cooling air passage between the high-voltage winding and the low-voltage winding to separate the cooling air passage into two separate heat dissipation areas, and allows the heat dissipation airflow to enter the cooling air passage in opposite directions to dissipate heat for the high-voltage winding and the low-voltage winding, thereby effectively preventing the problem of a large temperature difference between the inlet and outlet of the cooling air passage during traditional single-direction airflow heat dissipation. A first air guide housing and a second air guide housing are respectively arranged on the outer ring and inner ring circumferential side surfaces of the insulating cylinder, and the airflow entering the first air guide housing and the second air guide housing is first guided and then dissipated, thereby further reducing the temperature in the cooling air passage and increasing the airflow velocity therein;

[0016] 2. By setting the first partition block, the second partition block and the air guide port, the first heat dissipation air duct and the second heat dissipation air duct can be divided into multiple uniform areas, and each area can be cooled. The driving component drives the swing blades at each air guide port to swing back and forth, and guides the airflow to improve the uniformity of heat dissipation. The first driving motor drives the insulation cylinder to rotate, which can scrape off the dust attached to the surface of the high-voltage winding and the low-voltage winding, effectively ensuring the heat dissipation efficiency and long-term service life.

[0017] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0019] Figure 1 It is a schematic diagram of the transformer structure in the background description of the present invention;

[0020] Figure 2 Schematic diagram of the overall structure of the transformer in an embodiment of the present invention;

[0021] Figure 3 A side view of the overall structure of the transformer in an embodiment of the present invention;

[0022] Figure 4 This is a cross-sectional view of the internal structure of the transformer body according to an embodiment of the present invention;

[0023] Figure 5 For the present invention Figure 2 The enlarged schematic diagram at A in the middle;

[0024] Figure 6 This is a schematic diagram of the structure of the heat insulation cylinder in an embodiment of the present invention;

[0025] Figure 7 for Figure 6 Partial cross-sectional view at the middle BB.

[0026] The following are marked in the accompanying drawings:

[0027] 1 transformer body, 101 iron core, 102 high voltage winding, 103 low voltage winding, 2 connecting bracket, 201 clamping plate, 202 tension bolts, 3 pads, 4 cooling air duct, 5 insulation tube, 6 first heat dissipation air duct, 7 second heat dissipation air duct, 8 first air guide shell, 9 second air guide shell, 10 air guide port, 11 first heat dissipation fan, 12 second heat dissipation fan, 13 first partition block, 14 second partition block, 15 swing blade, 16 first drive motor, 17 transmission rod, 18 second drive motor, 19 cam, 20 movable ring, 21 connecting rod. DETAILED DESCRIPTION

[0028] like Figure 1 to Figure 7 As shown,

[0029] An energy-saving dry-type transformer comprises three transformer bodies 1 arranged in sequence along a horizontal straight line and connection brackets 2 fixedly arranged at the upper and lower ends thereof, each connection bracket 2 is composed of two "U"-shaped clamping plates 201 and tension bolts 202 for connecting the two clamping plates 201, each transformer body 1 comprises an iron core 101 and a low-voltage winding 103 and a high-voltage winding 102 sequentially sleeved on the outer side of the iron core 101 from the inside to the outside, wherein four spacers 3 are evenly spaced circumferentially between the clamping plates 201 and each transformer body 1 for separation, and the spacers 3 are fixed to the clamping plates 201 by bolts and nuts. The low voltage winding 103 and the high voltage winding 102 are spaced apart and form an annular cooling air duct 4, a vertical heat-insulating tube 5 is coaxially arranged in the cooling air duct 4, the upper and lower ends of the heat-insulating tube 5 extend out from the corresponding ends of the cooling air duct 4 respectively, and are rotatably connected with the corresponding pad 3, and a groove matching the heat-insulating tube 5 is provided on one side surface of each pad 3, and eight pads 3 are used to fix the corresponding heat-insulating tube 5, and the surface of the heat-insulating tube 5 is spaced apart from the surface of the low voltage winding 103 and the surface of the high voltage winding 102, and the outer ring surface of the heat-insulating tube 5 and the surface of the high voltage winding 102 together form an annular first heat dissipation air duct 6, and the heat-insulating tube 5 is connected to the cooling air duct 4. The inner ring surface of the cylinder 5 and the surface of the low-voltage winding 103 together form an annular second heat dissipation air duct 7, the outer ring surface of the insulation cylinder 5 is separated by an annular first air guide shell 8, the first air guide shell 8 and the insulation cylinder 5 together form a closed first annular chamber, the first air guide shell 8 is provided with a plurality of air guide ports 10 connected to the inside of the annular chamber on the peripheral side surface close to the high-voltage winding 102, the first annular chamber and the first heat dissipation air duct 6 are connected to a first heat dissipation fan 11, the inner ring surface of the insulation cylinder 5 is separated by an annular second air guide shell 9, the second air guide shell 9 and the insulation cylinder 5 together form a closed first annular chamber, the first air guide shell 8 is provided with a plurality of air guide ports 10 connected to the inside of the annular chamber on the peripheral side surface close to the high-voltage winding 102, the first annular chamber and the first heat dissipation air duct 6 are connected to a first heat dissipation fan 11, A closed second annular chamber is formed, and an air guide port 10 is opened on the surface of the second air guide shell 9 close to the low-voltage winding 103. The second annular chamber and the second heat dissipation air duct 7 are commonly connected to a second heat dissipation fan 12. The first heat dissipation fan 11 and the second heat dissipation fan 12 are both fixed to the surface of the connecting bracket 2 by bolts, wherein the airflow generated by the first heat dissipation fan 11 is upward along the axis of the insulation tube 5 and passes through the first heat dissipation air duct 6, and the airflow generated by the second heat dissipation fan 12 is downward along the axis of the insulation tube 5 and passes through the second heat dissipation air duct 7, so as to dissipate heat on the corresponding surfaces of the high-voltage winding 102 and the low-voltage winding 103 respectively.

[0030] As shown in the combined figure, the cooling air duct 4 is divided into a first heat dissipation air duct 6 and a second heat dissipation air duct 7 by the insulation tube 5, the airflow blown by the first heat dissipation fan 11 enters from the lower end of the insulation tube 5, and passes through the first heat dissipation air duct 6 upward along the axis of the insulation tube 5, and then flows out from the top of the insulation tube 5, and the airflow will take away the heat on the surface of the high-voltage winding 102; and the airflow blown by the second heat dissipation fan 12 is opposite to the first heat dissipation fan 11, and enters from the upper end of the insulation tube 5, and the airflow will take away the heat on the surface of the low-voltage winding 103. The heat of the surfaces of the high-voltage winding 102 and the low-voltage winding 103 can be taken away respectively by two airflows in opposite directions. Compared with the situation where a single airflow passes through the cooling air duct 4 and dissipates heat, the two airflows in the present invention can effectively improve the heat dissipation efficiency; and, since the surface of the insulation tube 5 is provided with a first air guide shell 8, and the surface of the first air guide shell 8 is provided with an air guide port 10 facing the high-voltage winding 102, a part of the airflow blown by the first heat dissipation fan 11 will enter the first annular cavity The airflow from the air guide port 10 will blow to the surface of the corresponding high-voltage winding 102, thereby taking away the heat from the surface. Since part of the airflow from the first heat dissipation fan 11 directly enters the first annular chamber and does not undergo heat exchange with the first heat dissipation air duct 6, the temperature of the airflow blown out from the first annular chamber is not much different from the temperature entering the first annular chamber, which can effectively dissipate heat and cool the surface of the high-voltage winding 102, and effectively improve the temperature difference between the upper and lower ends of the airflow when passing through the high-voltage winding 102. Among them, since the first air guide shell 8 occupies a part of the first annular chamber, the flow rate of part of the airflow entering the first heat dissipation air duct 6 is accelerated, which can speed up the speed of heat dissipation, prevent heat accumulation, and further improve the heat dissipation efficiency. The second air guide shell 9 and the air guide port 10 arranged in the second heat dissipation air duct 7 are similar to the above contents. Therefore, the heat dissipation principle and heat dissipation effect are similar to those in the first heat dissipation air duct 6, which will not be elaborated here.

[0031] Through two airflows in opposite directions that do not interfere with each other, the high-voltage winding 102 and the low-voltage winding 103 can be cooled respectively, heat exchange can be prevented, and the heat dissipation efficiency of the dry-type transformer can be effectively improved. Through the arrangement of the first air guide shell 8, the second air guide shell 9 and the air guide port 10, the temperature difference at the inlet and outlet ends of the airflow can be further improved, and the heat dissipation efficiency of the airflow on the high-voltage winding 102 and the low-voltage winding 103 is further enhanced, and heat accumulation is prevented, which has a more energy-saving, efficient and clean heat dissipation effect.

[0032] In this embodiment, a plurality of vertical first partition blocks 13 are provided on the circumferential side surface of the first air-conducting shell 8 facing the high-voltage winding 102, and the plurality of first partition blocks 13 are evenly spaced around the vertical axis of the first air-conducting shell 8, and one end of each of the first partition blocks 13 away from the first air-conducting shell 8 abuts against the surface of the high-voltage winding 102, and the plurality of air guide ports 10 between any two adjacent first partition blocks 13 are spaced along the vertical direction; a plurality of vertical second partition blocks 14 are provided on the surface of the second air-conducting shell 9 facing the low-voltage winding 103, and the second partition blocks 14 are evenly spaced around the vertical axis of the second air-conducting shell 9, one side surface of each of the second partition blocks 14 abuts against the surface of the low-voltage winding 103, and the plurality of air guide ports 10 between any two adjacent second partition blocks 14 are spaced along the vertical direction.

[0033] As shown in the figure, by setting a plurality of first partition blocks 13, the area between the first air guide shell 8 and the inner surface of the high-voltage winding 102 can be evenly divided into a plurality of areas of equal volume. When the airflow blown out by the first heat dissipation fan 11 enters the first heat dissipation air duct 6, the plurality of first partition blocks 13 can evenly divide the incoming airflow, guide the incoming airflow and increase the flow rate of the airflow. By setting the air guide port 10 between two adjacent first partition blocks 13, the temperature of the airflow blown out by the air guide port 10 is constant and lower than the temperature in the first heat dissipation air duct 6, and the surface of the high-voltage winding 102 between the two first partition blocks 13 can be quickly cooled, and the airflow coming in from the first heat dissipation air duct 6 can speed up the heat dissipation efficiency of the airflow discharged from the air guide port 10, prevent heat accumulation, and ultimately effectively improve the heat dissipation efficiency of the surface of the high-voltage winding 102; the second partition block 14 set in the second air guide shell 9 has a similar function to the first partition block 13, which will not be elaborated here.

[0034] In the present embodiment, a plurality of swing blades 15 are movably provided at each of the air guide ports 10, and the plurality of swing blades 15 in the air guide ports 10 are evenly spaced in the vertical direction, and each of the swing blades 15 is rotatably connected to the surfaces of the first air guide housing 8 and the second air guide housing 9, and each of the swing blades 15 is connected to a driving assembly that drives it to swing back and forth in a vertical plane, and the driving assembly includes a plurality of vertically arranged connecting rods 21, each connecting rod 21 is hinged to the corresponding plurality of swing blades 15, and the top end of each connecting rod 21 extends out of the heat insulation tube 5 and is fixedly connected to a movable ring 20, and the outer surface of the connecting rod 21 is sleeved with a ring that abuts against the heat insulation tube 5 and the movable ring 20. The spring between the surfaces of the movable ring 20, the side surface of the cushion block 3 is fixedly connected by bolts with a cam 19 abutting the surface of the movable ring 20 and a second drive motor 18 connected to the cam 19, the cam 19 is driven to rotate by the second drive motor 18, and the movable ring 20 reciprocates in the vertical direction, and indirectly drives each swing blade 15 to swing back and forth up and down, the second drive motor 18 is fixed to the surface of the connecting bracket 2 by bolts, wherein, when the airflow in the first annular chamber and the second annular chamber passes through the air guide port 10, each swing blade 15 is driven by the driving component to make the airflow at the air guide port 10 swing repeatedly in the vertical plane.

[0035] As shown in the figure, the cam 19 is driven to rotate by the second drive motor 18, so that the cam 19 reciprocates and intermittently abuts the surface of the movable ring 20, and cooperates with the spring, so that each connecting rod 21 reciprocates in the vertical direction, driving each swing blade 15 to swing back and forth in the vertical plane, guiding the airflow blown out of the air guide port 10, which can further increase the coverage area of ​​the airflow, reduce the heat dissipation dead angle, and improve the heat dissipation efficiency.

[0036] In the present embodiment, one end surface of each of the thermal insulation tubes 5 passes through the cooling air passage 4 and is connected to a first drive motor 16 that drives it to rotate around a vertical axis. The first drive motor 16 is fixedly arranged on the surface of the connecting bracket 2 by bolts. A transmission assembly is arranged between the three thermal insulation tubes 5 and the first drive motor 16. The transmission assembly includes a transmission rod 17 and three gear rings. The outer ring surface of the lower end of each of the thermal insulation tubes 5 is fixedly connected to the gear ring by bolts. The transmission rod 17 is horizontally arranged below the thermal insulation tube 5, and one end of the transmission rod 17 passes through a plurality of corresponding pads 3 and is rotatably connected thereto. The circumferential surface of the transmission rod 17 is provided with a thread that cooperates with the three gear rings. One end of the transmission rod 17 is transmission-connected to the first drive motor 16 through a bevel gear set.

[0037] As shown in the combined figure, the first drive motor 16 can drive the three insulation cylinders 5 to rotate around their vertical axis through the transmission shaft. Since the surfaces of the first partition block 13 and the second partition block 14 respectively abut the surfaces of the high-voltage winding 102 and the low-voltage winding 103, when the insulation cylinder 5 rotates, it will synchronously drive each first partition block 13 and the second partition block 14 to rotate, and scrape off the dust attached to the surface of the low-voltage winding 103 and the high-voltage winding 102, preventing dust from accumulating on their surface and affecting the heat dissipation efficiency, thereby ensuring the stability of heat dissipation and the service life.

[0038] In this embodiment, on a horizontal plane, each of the first partition blocks 13 and the second partition blocks 14 are arranged alternately and spaced along a circular direction, which can reduce the heat exchange between the first heat dissipation duct 6 and the second heat dissipation duct 7 on both sides of the insulation tube 5 to a certain extent.

[0039] In this embodiment, outlet ends of the first heat dissipation fan 11 and the second heat dissipation fan 12 are both connected to cooling components, and the cooling components are fixedly arranged on the surface of the connecting bracket 2 .

[0040] The cooling component can use a semiconductor refrigeration sheet or a copper heat pipe, heat dissipation fin, etc. used in the comparative documents in the background technology to cool the airflow blown out by the first heat dissipation fan 11 and the second heat dissipation fan 12 to make it lower than the ambient temperature. After the cooled airflow enters the transformer body 1, the heat dissipation efficiency of the transformer body 1 can be further improved.

[0041] In this embodiment, a plurality of through channels for thermal insulation are provided inside the thermal insulation tube 5 (not shown in the figure). Each through channel is vertically arranged, and both ends of the through channel respectively pass through the upper and lower end surfaces of the thermal insulation tube 5, which can improve the thermal insulation efficiency of the thermal insulation tube 5.

[0042] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An energy-saving dry-type transformer, comprising a transformer body (1) and connecting brackets (2) fixedly arranged at the upper and lower ends thereof, each connecting bracket (2) being composed of two "U"-shaped clamping plates (201) and tension bolts (202) for connecting the two clamping plates (201), four pads (3) being evenly spaced circumferentially between the clamping plates (201) and each transformer body (1) for separation, the pads (3) being fixed to the clamping plates (201) by bolts and nuts, the transformer body (1) comprising an iron core (101) and a low-voltage winding (103) and a high-voltage winding (102) being sequentially sleeved on the outer side of the iron core (101) from the inside to the outside, the low-voltage winding (103) and the high-voltage winding (102) being spaced and forming an annular cooling air duct (4), characterized in that: A vertically placed heat-insulating tube (5) is coaxially arranged in the cooling air passage (4), and the upper and lower ends of the heat-insulating tube (5) extend out of the corresponding ends of the cooling air passage (4) respectively, and are rotatably connected to the corresponding pads (3), and the surface of the heat-insulating tube (5) is spaced apart from the surfaces of the low-voltage winding (103) and the high-voltage winding (102), and the outer ring surface of the heat-insulating tube (5) and the surface of the high-voltage winding (102) together form an annular first heat-dissipating air passage (6), and the inner ring surface of the heat-insulating tube (5) and the surface of the low-voltage winding (103) together form an annular second heat-dissipating air passage (7), and the outer ring surface of the heat-insulating tube (5) is spaced apart from an annular first air-guiding shell (8), and the first air-guiding shell (8) and the heat-insulating tube (5) together form a first annular chamber, and the first air-guiding shell (8) is provided with a plurality of air-guiding ports (12) connected to the interior of the first annular chamber on the peripheral side surface close to the high-voltage winding (102) 10), the first annular chamber and the first heat dissipation air duct (6) are connected to a first heat dissipation fan (11), the inner ring surface of the insulation tube (5) is provided with an annular second air guide shell (9), the second air guide shell (9) and the insulation tube (5) together form a second annular chamber, and the second air guide shell (9) is provided with an air guide port (10) on the surface close to the low-voltage winding (103), the second annular chamber and the second heat dissipation air duct (7) are connected to a second heat dissipation fan (12), the first heat dissipation fan (11) and the second heat dissipation fan (12) are both fixed on the surface of the connecting bracket (2), wherein the airflows generated by the first heat dissipation fan (11) and the second heat dissipation fan (12) flow through the first heat dissipation air duct (6) and the second heat dissipation air duct (7) in different directions up and down, and respectively dissipate heat from the corresponding high-voltage winding (102) and low-voltage winding (103) surfaces.

2. An energy-saving dry-type transformer according to claim 1, characterized in that: The first air-conducting shell (8) is provided with a plurality of vertical first partition blocks (13) on the peripheral side surface facing the high-voltage winding (102), and the plurality of first partition blocks (13) are evenly spaced around the vertical axis of the first air-conducting shell (8), one end of each of the first partition blocks (13) away from the first air-conducting shell (8) is in contact with the surface of the high-voltage winding (102), and the plurality of air guide ports (10) between any two adjacent first partition blocks (13) are spaced apart in the vertical direction; the second air-conducting shell (9) is provided with a plurality of vertical second partition blocks (14) on the surface facing the low-voltage winding (103), and the second partition blocks (14) are evenly spaced around the vertical axis of the second air-conducting shell (9), one side surface of each of the second partition blocks (14) is in contact with the surface of the low-voltage winding (103), and the plurality of air guide ports (10) between any two adjacent second partition blocks (14) are spaced apart in the vertical direction.

3. An energy-saving dry-type transformer according to claim 2, characterized in that: A plurality of swing blades (15) are movably provided at each of the air guide ports (10), and the plurality of swing blades (15) in the air guide ports (10) are evenly spaced in the vertical direction, and each of the swing blades (15) is rotatably connected to the surface of the first air guide housing (8) and the second air guide housing (9), and each of the swing blades (15) is connected to a driving component that drives it to swing back and forth in a vertical plane, and the driving component is fixed to the surface of the connecting bracket (2), wherein when the airflow in the first annular chamber and the second annular chamber passes through the air guide port (10), each swing blade (15) is driven by the driving component to cause the airflow at the air guide port (10) to swing back and forth in the vertical plane.

4. The energy-saving dry-type transformer according to claim 3, characterized in that: One end surface of the heat-insulating cylinder (5) passes through the cooling air passage (4) and is connected to a first drive motor (16) that drives it to rotate around a vertical axis. The first drive motor (16) is fixedly arranged on the surface of the connecting bracket (2).

5. The energy-saving dry-type transformer according to claim 4, characterized in that: On a horizontal plane, each of the first dividing blocks (13) and the second dividing blocks (14) are arranged alternately and at intervals along a circular direction.

6. The energy-saving dry-type transformer according to claim 5, characterized in that: The outlet ends of the first heat dissipation fan (11) and the second heat dissipation fan (12) are both connected to a cooling component, and the cooling component is fixedly arranged on the surface of the connecting bracket (2).

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