Dry-type transformer dissipating heat by multi-stage cooling

Abstract

The application discloses a dry-type transformer radiating heat through multistage cooling, and belongs to the technical field of dry-type transformers. The dry-type transformer radiating heat through multistage cooling comprises a transformer body and a cooling mechanism. The transformer body is composed of a plurality of transformer wire groups. The cooling mechanism is arranged on the outer surface of the transformer body. The cooling mechanism comprises a cooling fan arranged below the transformer wire group, the cooling fan extending along the bottom edge of the transformer wire group, an airflow outlet arranged on the top of the cooling fan, a baffle support rod extending upwards along the surface of the transformer wire group arranged on the top of the cooling fan, a plurality of airflow baffles extending upwards in the length direction and hinged to the spring hinge of the baffle support rod, one end of the airflow baffle in the width direction being movably connected to the spring hinge, and the positions of the airflow baffles between adjacent baffle support rods being arranged in a staggered manner in the vertical direction. The transformer body is cooled and radiated heat through the multistage cooling mechanism, so that the cooling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dry-type transformers, and in particular to a dry-type transformer that dissipates heat through multi-stage cooling. Background Art

[0002] Dry-type transformers are important equipment in power systems, and their stable operation is crucial to the normal operation of power systems. Dry-type transformers generate heat during operation. If not cooled and dissipated in a timely manner, it will affect the service life and performance of the dry-type transformer and may even cause a fire. To ensure the safe and stable operation of dry-type transformers, dry-type transformers usually need to have good cooling and heat dissipation capabilities. Natural air cooling and forced air cooling are usually used to cool dry-type transformers. Most dry-type transformers are equipped with cooling fans under the windings to ensure forced air cooling when necessary. However, most dry-type transformer cooling fans only form vertical upward airflow to dissipate heat from the windings, removing heat around the windings and promoting winding cooling. Only part of the airflow contacts the winding surface, while the other part of the airflow is less efficient in removing heat from the windings. The actual cooling efficiency of the cooling fan for dry-type transformers is not ideal. Improving the heat dissipation performance of dry-type transformers usually involves simply increasing the power of the cooling fan, which creates a larger airflow to remove more heat, but does not improve cooling efficiency.

[0003] Based on the above situation, the Chinese patent with announcement number CN112530666A discloses a high heat dissipation dry-type transformer, including a transformer box, a transformer main body fixedly arranged in the transformer box, an air inlet arranged at the upper end of the transformer box, an air outlet arranged at the bottom of the transformer box, a cold air device arranged at the air inlet, and a mounting device provided on the transformer box for fixing the cold air device. The cold air device includes a cover, a water tank fixedly arranged on the cover, a water spray assembly rotatably arranged on the water tank, a first water retaining ring fixedly arranged in the water tank, a bellows fixedly arranged on the water tank, and an inlet provided on the bellows. An air pipe, a driving shaft rotatably arranged at the center of the bellows at one end, a first motor for driving the driving shaft to rotate, a fan fixedly sleeved on the driving shaft, an air distribution component rotatably arranged in a cover shell, a first conical plate rotatably sleeved on the driving shaft and fixedly arranged in the cover shell, a plurality of conical holes equidistantly distributed in an annular manner on the first conical plate, an air-water separation component located in the cover shell below the first conical plate, a water pump fixedly arranged on the transformer box, a cooler fixedly arranged on the water pump and connected to the water pump, a first connecting pipe for connecting the cooler and the water tank, and a second connecting pipe for connecting the water pump and the air-water separation component.

[0004] The dry-type transformer disclosed in the above patent improves the heat dissipation effect of cooling air on the dry-type transformer by arranging a cooling air device on the top that can reduce the cooling air. The low-temperature cooling air is transported into the transformer box through the air inlet to cool the transformer body. However, part of the cooling air cannot come into contact with the transformer body. These cooling air usually only carry a small amount of heat and are discharged from the transformer box, resulting in low efficiency of the cooling air in removing heat, thereby affecting the cooling efficiency of the cooling air on the transformer body. Therefore, there is still room for improvement in this dry-type transformer. Summary of the Invention

[0005] In view of the technical defects existing in the background technology, the present invention proposes a dry-type transformer with multi-stage cooling and heat dissipation, which solves the above technical problems and meets practical needs. The specific technical solution is as follows:

[0006] A dry-type transformer that dissipates heat through multi-stage cooling, comprising a transformer body and a cooling mechanism, wherein the transformer body is composed of a plurality of transformer windings, the cooling mechanism is sleeved on the outer surface of the transformer body, and the cooling mechanism is composed of the following structures: a cooling fan arranged below the transformer winding, the cooling fan extending along the bottom edge of the transformer winding, an air flow outlet being provided at the top of the cooling fan, a baffle support rod extending upward along the surface of the transformer winding, the baffle support rod being hinged with a plurality of air flow baffles extending upwardly and obliquely in the longitudinal direction by a spring hinge, one end of the air flow baffle being movably connected to the spring hinge in the width direction, and the positions of the air flow baffles between adjacent baffle support rods being staggered in the vertical direction.

[0007] As a further technical solution of the present invention, the extended end of the air flow baffle is close to the spring hinge of another adjacent air flow baffle, and several air flow baffles with their two ends close to each other jointly form an air flow guide plate, and a guide channel is jointly formed between the two adjacent air flow guide plates.

[0008] As a further technical solution of the present invention, the baffle support rod is composed of a first support rod and a second support rod, and the first support rod and the second support rod are alternately arranged along the extension direction of the cooling fan. The airflow baffles between adjacent first support rods are successively terminated and approached to form a number of airflow guide plates, and the airflow baffles between adjacent second support rods are successively terminated and approached to form a number of airflow guide plates.

[0009] As a further technical solution of the present invention, the plurality of airflow guide plates formed by the first support rods and the plurality of airflow guide plates formed by the second support rods are alternately arranged.

[0010] As a further technical solution of the present invention, the angles between the airflow baffles in the first support rod and the second support rod and the horizontal plane are both a, where 20°≤a≤45°.

[0011] As a further technical solution of the present invention, the airflow baffles between adjacent baffle support rods are successively terminated and approached to form a plurality of airflow guide plates, and the angle between the airflow baffle and the horizontal plane is b, wherein 45°≤b≤70°.

[0012] As a further technical solution of the present invention, one end of the spring hinge extends toward the axis of the transformer winding group, and the other end extends obliquely downward.

[0013] As a further technical solution of the present invention, two cooling fans are provided under each transformer winding group, and the cooling fans extend from one side of the transformer winding group to the other side.

[0014] As a further technical solution of the present invention, a support bracket is mounted outside the transformer body, a low-voltage transformer is provided at the low-voltage end of the transformer body and a high-voltage transformer is provided at the high-voltage end of the transformer body and the support bracket is fixedly connected to the high-voltage transformer.

[0015] The beneficial effects of the present invention are:

[0016] The present invention uses a cooling fan to generate an upward airflow to force air cooling on the transformer body. During the movement, the airflow moves upward at an angle and extends the movement path under the guidance of the airflow baffle. The airflow baffle can also cut the airflow to form several small airflows, and make the small airflows collide with each other to form vortices and fully contact the surface of the transformer wire group, thereby improving the cooling efficiency of the cooling mechanism on the transformer body. In addition, an airflow with a larger flow rate and flow rate will cause the airflow baffle to swing and change the flow path of the small airflow, and at the same time can intensify the collision between the small airflows to better form vortices, thereby improving the cooling effect and cooling efficiency of the airflow on the transformer body. Airflow baffles at different angles enable the cooling mechanism to produce different cooling effects on the transformer body, and multi-stage cooling and heat dissipation is achieved when the transformer wire group is at different temperatures, so that the airflow can always take away the heat in the transformer wire group with high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a structural schematic diagram of a first embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0018] Figure 2 yes Figure 1 Partial schematic diagram at point A in the middle.

[0019] Figure 3 The present invention is a schematic diagram of the expansion of the cooling mechanism of a first embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0020] Figure 4The present invention is a schematic diagram of the airflow direction of a first embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0021] Figure 5 The present invention is a schematic diagram of the expansion of the cooling mechanism of the second embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0022] Figure 6 The present invention is a schematic diagram of the airflow direction of a second embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0023] Figure 7 The present invention is a structural schematic diagram of a third embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0024] Figure 8 yes Figure 7 Partial schematic diagram of point B in the middle.

[0025] Figure 9 The present invention is a schematic diagram of an expanded cooling mechanism of a third embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0026] Figure 10 The present invention is a schematic diagram of the airflow direction of a third embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0027] Figure 11 The present invention is a structural schematic diagram of a fourth embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0028] Among them: 1-transformer body, 11-transformer wire group, 12-low-voltage transformer, 13-high-voltage transformer, 2-cooling mechanism, 21-cooling fan, 22-air flow outlet, 23-baffle support rod, 231-first support rod, 232-second support rod, 24-spring hinge, 25-air flow baffle, 3-air flow guide plate, 4-guide channel, 5-support bracket. DETAILED DESCRIPTION

[0029] The following describes the implementation methods of the present invention in conjunction with relevant drawings and examples. The implementation methods of the present invention are not limited to the following examples, and the present invention relates to relevant necessary components in this technical field, which should be regarded as common knowledge in this technical field and can be known and mastered by technical personnel in this technical field.

[0030] like Figure 1 、 2As shown, a dry-type transformer radiates heat through multi-stage cooling, comprising a transformer body 1, a cooling mechanism 2, the transformer body 1 is composed of several transformer wire groups 11, the cooling mechanism 2 is sleeved on the outer surface of the transformer body 1, the cooling mechanism 2 is composed of the following structures, a cooling fan 21 arranged below the transformer wire group 11, the cooling fan 21 extends along the bottom edge of the transformer wire group 11, the top of the cooling fan 21 is provided with an air outlet 22, the top of the cooling fan 21 is provided with a baffle support rod 23 extending upwards along the surface of the transformer wire group 11, the baffle support rod 23 is hinged with several lengthwise inclined air flow baffles 25 extending upwards by spring hinges 24, one end of the air flow baffle 25 in the width direction is movably connected with the spring hinge 24, and the positions of the air flow baffles 25 between adjacent baffle support rods 23 are staggered in the vertical direction.

[0031] The dry-type transformer of the present application realizes multi-stage cooling through the cooling mechanism 2, improves the defect that the cooling wind cooling efficiency is low in the current dry-type transformer, in the transformer body 1, the transformer wire group 11 is composed of commonly used components such as the iron core, the high-voltage winding, the low-voltage winding and the neutral wire winding, the top of the transformer wire group 11 is provided with a thermocouple probe, the thermocouple probe can detect the temperature inside the transformer wire group 11, the servo system adjusts the running state of the cooling fan 21 according to the temperature detected by the thermocouple probe and through commonly used elements such as frequency converters, so that the cooling mechanism 2 realizes different cooling effects; specifically, when the thermocouple probe detects that the temperature inside the transformer wire group 11 rises to a certain temperature during the working process of the transformer body 1, the cooling fan 21 starts to work and generates air flow moving upwards along the surface of the transformer wire group 11 at the air outlet 22, and the transformer wire group 11 is forced air-cooled, the air flow contacts the air flow baffles 25 and moves obliquely upwards under the guidance of the air flow baffles 25 during the upward movement, the air flow generated by the cooling fan 21 is divided into several small air flows moving obliquely upwards by the air flow baffles 25, the paths of these small air flows moving along the surface of the transformer wire group 11 in unit time are longer, which is beneficial to taking away more heat in the transformer wire group 11, thereby improving the cooling efficiency of the air flow on the transformer body 1.

[0032] It needs to be further explained that, as the first preferred embodiment of the present application, Figure 3 , 4As shown, combined with the expansion schematic diagram of the cooling mechanism 2 of the present invention and the airflow direction schematic diagram, the figure is obtained after the cooling mechanism 2 is expanded along a straight line. The airflow direction refers to the arrow direction in the figure. When the airflow is divided into small airflows by the airflow baffle 25, the small airflow moves from the spring hinge 24 of the airflow baffle 25 along the lower surface of the airflow baffle 25 toward the top. At this time, the movement direction of the small airflow and the angle between the length direction of the airflow baffle 25 and the horizontal plane are the same. When the small airflow moves to the top of the airflow baffle 25, part of the small airflow continues to move in the original direction under the action of inertia, and the other part continues to move in the original direction. Part of the small airflow will move upward in a direction with a larger angle to the horizontal plane. This part of the small airflow is likely to collide with another small airflow above to generate a turbulent effect, thereby causing the small airflow to form a vortex. Each small airflow formed by the airflow baffle 25 can form a vortex under the above-mentioned turbulent effect. The small airflow after forming the vortex has a longer movement path per unit time, so that the small airflow can fully contact the surface of the transformer wire group 11, thereby increasing the heat taken away by the small airflow from the transformer wire group 11, and thus making the cooling mechanism 2 have a higher cooling efficiency for the transformer body 1.

[0033] It should be further explained that the smaller the angle between the air flow baffle 25 and the horizontal plane, the longer it takes for the air flow to move from the bottom to the top of the transformer winding group 11. This is usually suitable for situations where the internal temperature of the transformer winding group 11 is moderate but forced air cooling is required to maintain normal operation. However, as the load of the transformer body 1 increases or other factors cause the internal temperature of the transformer winding group 11 to rise during operation, the air flow has already carried a lot of heat when it moves to a position close to the top of the transformer winding group 11 and cannot meet the cooling and heat dissipation requirements at the top of the transformer winding group 11. It is usually necessary to increase the power of the cooling fan 21 to increase the flow rate and flow rate of the generated air flow to remove more heat.

[0034] As a second preferred embodiment of the present invention, Figure 5 、 6As shown, combined with the expansion schematic diagram of the cooling mechanism 2 of the present invention and the airflow direction schematic diagram, the figure is obtained after the cooling mechanism 2 is expanded along a straight line, and the airflow direction refers to the direction of the arrow in the figure. Since the airflow generated by the cooling fan 21 will generate an upward force on the airflow baffle 25 from the bottom, and the airflow baffle 25 is movably connected to the baffle support rod 23 through the spring hinge 24, the greater the flow rate and flow rate of the airflow, the greater the force on the airflow baffle 25. When the force exceeds the elastic force of the spring inside the spring hinge 24 that causes the minimum deformation, the airflow baffle 25 will swing, so that the angle between the airflow baffle 25 and the horizontal plane increases. The time required for the airflow to move from the bottom to the top of the transformer wire group 11 will be shortened, which is beneficial to avoid the airflow being unable to meet the cooling and heat dissipation at the top of the transformer wire group 11, and improving the cooling effect of the cooling mechanism 2 on the entire transformer wire group. At the same time, after the small airflows divided by the airflow baffle 25 move to the top of the airflow baffle 25, a larger part of the small airflows will move upward in a direction forming a larger angle with the horizontal plane, which is beneficial to intensify the collision between the small airflows and better form a swirl of the airflow, so that the airflow can more fully contact the surface of the transformer wire group 11, further improving the cooling efficiency of the cooling mechanism 2 on the transformer body 1.

[0035] To sum up, the present invention uses the cooling fan 21 to generate an upward airflow to force air cooling on the transformer body 1. During the movement, the airflow moves upward at an angle and extends the movement path under the guidance of the airflow baffle 25. The airflow baffle 25 can also cut the airflow to form several small airflows, and make the small airflows collide with each other to form vortices and fully contact the surface of the transformer wire group 11, thereby improving the cooling efficiency of the cooling mechanism 2 on the transformer body 1. In addition, the airflow with a larger flow rate and flow rate will cause the airflow baffle 25 to swing and change the flow path of the small airflow, and at the same time, it can intensify the collision between the small airflows to better form vortices, thereby improving the cooling effect and cooling efficiency of the airflow on the transformer body 1. The airflow baffles 25 at different angles enable the cooling mechanism 2 to produce different cooling effects on the transformer body 1, and realize multi-stage cooling and heat dissipation when the transformer wire group 11 is at different temperatures, so that the airflow can always take away the heat in the transformer wire group 11 with higher efficiency.

[0036] As one of the preferred embodiments of the present invention, Figure 1-4As shown, the extended end of the air flow baffle 25 is close to the spring hinge 24 of another adjacent air flow baffle 25, and several air flow baffles 25 with their two ends close to each other jointly form an air flow guide plate 3, and a guide channel 4 is jointly formed between two adjacent air flow guide plates 3; the air flow guide plate 3 is composed of several air flow baffles 25 that are close to each other end to end, and the air flow guide plate 3 and the air flow baffle 25 have the same inclination angle. The air flow generated by the cooling fan 21 will be separated by the air flow guide plate 3 to form several streams of air flow moving along the guide channel 4. During the movement of the air flow, part of the air flow will be diverted from between the two adjacent air flow baffles 25 to the adjacent guide channel 4. The air flow is formed into a vortex through the mutual collision between the air flows, so that the air flow can more fully contact the surface of the transformer wire group 11, thereby improving the cooling efficiency of the cooling mechanism 2 on the transformer body 1.

[0037] After adopting the above structure, it needs to be further explained that, if Figure 3 、 4 As shown, the baffle support rod 23 is composed of a first support rod 231 and a second support rod 232. The first support rod 231 and the second support rod 232 are alternately arranged along the extension direction of the cooling fan 21. The air flow baffles 25 between adjacent first support rods 231 are successively closed and close to each other to form a plurality of air flow guide plates 3. The air flow baffles 25 between adjacent second support rods 232 are successively closed and close to each other to form a plurality of air flow guide plates 3. The air flow baffles 25 in the plurality of first support rods 231 can form a plurality of air flow guide plates 3 based on the sequential end-to-end close relationship between the air flow baffles 25. Similarly, the plurality of second support rods 232 The several air flow baffles 25 can also form several air flow guide plates 3 based on the air flow baffles 25 being close to each other in sequence. Since the first support rod 231 and the second support rod 232 are alternately arranged, the guide channel 4 in the cooling mechanism 2 in this state is longer, so that most of the air flow moves along a fixed path. The path and time of the air flow moving along the guide channel 4 are both longer, and it can fully contact the surface of the transformer wire group 11. It is suitable for transformer wire groups 11 with moderate internal temperature but need to be cooled by forced air cooling, so that the cooling fan 21 can produce a higher cooling effect with a lower operating power.

[0038] After adopting the above structure, it needs to be further explained that, if Figure 3 、 4 As shown, the plurality of airflow guide plates 3 formed by the first support rod 231 and the plurality of airflow guide plates 3 formed by the second support rod 232 are alternately arranged; since the airflow will be closer to the bottom of the airflow baffle 25 during movement, the adoption of this structure can form more guide channels 4 between the airflow guide plates 3, so that the airflow is divided into more portions of airflow and the width of the airflow during movement is reduced, thereby avoiding excessive concentration of the airflow and affecting its cooling efficiency for the transformer line group 11.

[0039] After adopting the above structure, it needs to be further explained that, if Figure 3 、 4 As shown, the angles a between the air flow baffle 25 and the horizontal plane in the first support rod 231 and the second support rod 232 are both 20°≤a≤45°; the angle a between the air flow baffle 25 and the horizontal plane is preferably 30°. At this time, the air flow baffle 25 is in a non-swinging state, and the angle between the air flow baffle 25 and the horizontal plane is low, which is conducive to extending the air flow guide plate 3 at a lower angle and increasing its extension length. The path and time of the air flow moving along the guide channel 4 are both long, and it can fully contact the surface of the transformer winding group 11. It is suitable for the transformer winding group 11 with a moderate internal temperature but requiring forced air cooling for cooling, so that the cooling fan 21 can produce a higher cooling effect with a lower operating power.

[0040] It should be noted that if Figure 5 、 6 As shown, as the movement power of the cooling fan 21 increases, the flow rate and flow rate of the air flow generated by it increase. The air flow baffle 25 swings along the spring hinge 24 under the action of the impact force of the air flow, so that the angle between the air flow baffle 25 and the horizontal plane becomes larger. As the swing angle of the air flow baffle 25 becomes larger and larger, it is difficult for the air flow baffles 25 to approach each other end to form the air flow guide plate 3 and the guide channel 4. The air flow will be divided into several small air flows by the air flow baffle 25. These small air flows can also form vortices by colliding with each other. The corresponding principle has been fully explained in the previous article, and this situation will not be repeated here.

[0041] As a third preferred embodiment of the present invention, Figure 7-10 As shown, the air flow baffles 25 between adjacent baffle support rods 23 are successively closed and close to form a plurality of air flow guide plates 3, and the angle between the air flow baffle 25 and the horizontal plane is b, wherein 45°≤b≤70°; the angle b between the air flow baffle 25 and the horizontal plane is preferably 60°. At this time, the air flow baffle 25 is at the maximum swing amplitude along the spring hinge 24, and the plurality of air flow baffles 25 are re-formed into a plurality of air flow guide plates 3 by approaching each other end to end, and the number of air flow guide plates 3 formed is twice that when the angle is a. At the same time, the cooling fan 21 is at a higher or highest motion power, and the air flow direction is shown in the attached figure. Figure 10 In the direction of the middle arrow, the path and time of the airflow along the guide channel 4 are both short. In this case, the cooling mechanism 2 is suitable for cooling and dissipating the transformer winding group 11 with a relatively high internal temperature. As can be seen, the airflow baffles 25 at different angles enable the cooling mechanism 2 to produce different cooling effects on the transformer body 1, achieving multi-stage cooling and dissipation when the transformer winding group 11 is at different temperatures, so that the airflow can always remove the heat in the transformer winding group 11 with high efficiency.

[0042] As one of the preferred embodiments of the present application, one end of the spring hinge 24 extends towards the axis of the transformer winding group 11, and the other end extends obliquely downward. The spring hinge 24 with this structure makes the air baffle 25 obliquely upward at one end of the width direction, and the air flow generated by the cooling fan 21 can move obliquely towards the surface of the transformer winding group 11 after contacting the air baffle 25, which is beneficial to better form a cyclone, and can reduce the flow of air flow escaping from the cooling mechanism 2, thereby improving the cooling efficiency of the cooling mechanism 2 on the transformer body 1.

[0043] As one of the preferred embodiments of the present application, as shown in Figure 1 , two cooling fans 21 are arranged below each transformer winding group 11, and the cooling fans 21 extend from one side to the other side of the transformer winding group 11. The shell shape of the cooling fan 21 is semicircular, and the cooling fan 21 extends along the bottom edge of the transformer winding group 11. The two cooling fans 21 arranged below the transformer winding group 11 can better generate air flow that completely wraps the surface of the transformer winding group 11, which is beneficial to improve the cooling effect of the cooling mechanism 2 on the transformer body.

[0044] As a fourth preferred embodiment of the present application, as shown in Figure 11 , a support bracket 5 is arranged outside the transformer body 1, a low-voltage transformer 12 is arranged at the low-voltage end of the transformer body 1 and fixedly connected with the support bracket 5, and a high-voltage transformer 13 is arranged at the high-voltage end of the transformer body 1 and fixedly connected with the support bracket 5. The support bracket 5 is mainly used for supporting and fixing the components such as the transformer winding group 11, the cooling fan 21, the low-voltage transformer 12, and the high-voltage transformer 13. The low-voltage transformer 12 is preferably a low-voltage current transformer, and the high-voltage transformer 13 is preferably a high-voltage current transformer. The current transformer can measure the current size of the low-voltage end or the high-voltage end of the transformer body 1, and can also accurately measure and monitor the current. Potential faults in the power system can be found in time, and important data for monitoring and dispatching of the power system can be provided. When the transformer is overloaded or short-circuited, the current transformer can quickly sense the current anomaly and trigger the protection device to cut off the fault current, thereby protecting the transformer body 1 from damage. The current transformer provides current protection for the transformer by accurately measuring and monitoring the current, which is beneficial to improve the stability of the power system.

[0045] The above is only a preferred embodiment of the present application, and it should be pointed out that those skilled in the art can make some improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the scope of protection of the present application.

Claims

1. A dry-type transformer that dissipates heat through multi-stage cooling, comprising a transformer body (1) and a cooling mechanism (2), characterized in that: The transformer body (1) is composed of a plurality of transformer winding groups (11); the cooling mechanism (2) is sleeved on the outer surface of the transformer body (1); the cooling mechanism (2) is composed of the following structures: a cooling fan (21) is arranged below the transformer winding group (11); the cooling fan (21) extends along the bottom edge of the transformer winding group (11); an air flow outlet (22) is provided on the top of the cooling fan (21); a baffle support rod (23) extending upward along the surface of the transformer winding group (11) is provided on the top of the cooling fan (21); the baffle support rod (23) is hinged with a plurality of air flow baffles (25) extending upward in a longitudinal direction by a spring hinge (24); one end of the air flow baffle (25) in a width direction is movably connected to the spring hinge (24); the positions of the air flow baffles (25) between adjacent baffle support rods (23) are staggered in the vertical direction; The extended end of the airflow baffle (25) is close to the spring hinge (24) of another adjacent airflow baffle (25), and a plurality of airflow baffles (25) with two ends close to each other jointly form an airflow guide plate (3), and a guide channel (4) is jointly formed between two adjacent airflow guide plates (3); The baffle support rod (23) is composed of a first support rod (231) and a second support rod (232), and the first support rod (231) and the second support rod (232) are alternately arranged along the extension direction of the cooling fan (21), and the air flow baffles (25) between adjacent first support rods (231) are successively closed together and form a plurality of air flow guide plates (3), and the air flow baffles (25) between adjacent second support rods (232) are successively closed together and form a plurality of air flow guide plates (3).

2. The dry-type transformer with multi-stage cooling according to claim 1, characterized in that: The plurality of airflow guide plates (3) formed by the first support rod (231) and the plurality of airflow guide plates (3) formed by the second support rod (232) are arranged alternately.

3. The dry-type transformer with multi-stage cooling according to claim 1, characterized in that: The included angles between the airflow baffles (25) in the first support rod (231) and the second support rod (232) and the horizontal plane are both a, where 20°≤a≤45°.

4. The dry-type transformer with multi-stage cooling according to claim 1, characterized in that: The airflow baffles (25) between adjacent baffle support rods (23) are successively closed and close to form a plurality of airflow guide plates (3), and the angle between the airflow baffles (25) and the horizontal plane is b, wherein 45°≤b≤70°.

5. The dry-type transformer with multi-stage cooling according to claim 1, characterized in that: One end of the spring hinge (24) extends toward the axis of the transformer wire group (11), and the other end extends obliquely downward.

6. The dry-type transformer with multi-stage cooling according to claim 1, characterized in that: Two cooling fans (21) are provided below each transformer winding group (11), and the cooling fans (21) extend from one side of the transformer winding group (11) to the other side.

7. The dry-type transformer with multi-stage cooling according to claim 1, characterized in that: A support bracket (5) is provided on the outside of the transformer body (1), a low-voltage transformer (12) fixedly connected to the support bracket (5) is provided at the low-voltage end of the transformer body (1), and a high-voltage transformer (13) fixedly connected to the support bracket (5) is provided at the high-voltage end of the transformer body (1).

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