Dry-type transformer for photovoltaic power generation inversion

Abstract

The invention relates to the technical field of transformer cooling, in particular to a dry-type transformer for photovoltaic power generation inversion, which comprises a mounting frame, a fan, a lower iron yoke, an iron core, an upper iron yoke, a low-voltage winding, a high-voltage winding, a ventilation slot, a driving assembly, a fixing assembly and a pressing assembly. The driving assembly is connected with the upper iron yoke, so that the working frequency of the driving assembly can change along with the change of the load of the upper iron yoke, and meanwhile, the load change of the transformer can influence the temperature, so that the working frequency of the driving assembly can be changed along with the change of the temperature of the transformer; therefore, the temperature between the low-voltage winding and the high-voltage winding and the temperature between the two adjacent windings can be maintained in a relatively reasonable range, and the problems of short circuit and the like caused by damage to the insulativity of equipment due to temperature rise are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of transformer cooling, in particular to a dry-type transformer used for photovoltaic power generation inversion. Background Art

[0002] In photovoltaic power generation systems, since solar panels generate direct current, it needs to be converted into alternating current before being transmitted to a dry-type transformer. The inverter is the key equipment to achieve this process. Its main function is to convert the direct current generated by solar panels into alternating current. Before the generated alternating current is used in home or commercial facilities, it needs to be adjusted to a suitable voltage through a transformer.

[0003] The most common transformers are dry-type transformers. In simple terms, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil. The cooling methods can be divided into natural convection heat exchange and forced convection heat exchange. Natural convection heat exchange is that the temperature of the core and windings increases, which causes the temperature of the surrounding air to increase, causing the air to begin to convect naturally, and the hot air gradually floats up and flows to the top, and flows out from the top, and then cold air enters from the bottom to achieve cooling; while forced convection heat exchange is achieved by installing a fan at the bottom of the winding. When the temperature reaches a certain level, the fan starts to speed up the flow rate of the air in the winding, thereby assisting the transformer in cooling down; however, the dry-type transformers in photovoltaic power stations are usually set outdoors, and the temperature of the external environment is relatively high. The air cooling effect of traditional equipment is not ideal. In order to avoid damage to the equipment caused by natural phenomena such as rain, a protective box is usually installed outside the transformer, which will further reduce the heat dissipation effect of the transformer.

[0004] In view of the above problems, a solution has been proposed in the prior art. For example, a dry-type transformer for photovoltaic power generation inverter is disclosed in CN110660562A. In the prior art, a heat dissipation mechanism is arranged at the bottom and both sides of the dry-type transformer, a blower mechanism is arranged at the top of the heat dissipation mechanism, a cooling cavity is arranged in the middle of the heat dissipation mechanism, and an air outlet is arranged at the bottom of the heat dissipation mechanism. During use, the cooling cavity cools the air blown out by the blower and then passes it into the bottom of the transformer. Although the prior art enhances the heat dissipation effect of the transformer to a certain extent, the areas suitable for photovoltaic power generation usually have relatively high At high altitudes, especially in plateau areas, the sunshine hours are longer and the solar energy resources are very rich; however, high altitudes will also change meteorological parameters such as atmospheric pressure, air density, humidity and temperature. The reduction in atmospheric pressure and air density will make the cooling effect of the air medium worse, thereby affecting the cooling effect of the transformer; and due to the influence of gas viscosity and wall roughness, the air flow rate near the winding wall will decrease rapidly, forming an extremely thin velocity boundary layer and temperature boundary layer. As the winding height increases, the velocity boundary layer and temperature boundary layer gradually become thicker, resulting in a decrease in convective heat transfer and heat conduction effects.

[0005] Therefore, a dry-type transformer for photovoltaic power generation inverter is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a dry-type transformer for photovoltaic power generation inversion, which solves the problem of poor heat dissipation of the transformer caused by poor cooling effect of the air medium in a low-pressure environment and low natural air flow rate. By arranging a drive component and a pressing component, the air flow between the low-voltage winding and the high-voltage winding is accelerated. At the same time, the operating frequency of the drive component is combined with the deformation frequency of the upper iron yoke, so that the drive component can adaptively adjust the operating frequency of the pressing component according to the load and heating conditions of the upper iron yoke.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A dry-type transformer for photovoltaic power generation inversion comprises a mounting frame, a fan, a lower iron yoke, an iron core, an upper iron yoke, a low-voltage winding, a high-voltage winding and a ventilation slot, wherein the fan is connected to the lower side of the mounting frame, the lower iron yoke, the iron core and the upper iron yoke are all connected to the mounting frame, the low-voltage winding and the high-voltage winding are sleeved on the outer side of the iron core in order from the inside to the outside, the ventilation slot is provided on the low-voltage winding and the high-voltage winding, and further comprises a driving component, a fixing component and a pressing component, wherein the driving component is connected to the mounting frame and is located below the upper iron yoke, the fixing component is connected to the mounting frame and the driving component, the pressing component is connected to the fixing component, the driving component, the fixing component and the pressing component are all arranged between the low-voltage winding and the high-voltage winding, the deformation of the upper iron yoke drives the driving component to move up and down cyclically on the fixing component, thereby pushing the pressing component to squeeze the low-voltage winding and the high-voltage winding at a specified frequency, and the moving frequency of the driving component changes with the change of the transformer load.

[0009] The iron core of the dry-type transformer is made of silicon steel sheets and is an important bridge for the dry-type transformer to perform electromagnetic conversion. When the transformer is working, the iron core will undergo a magnetostrictive effect. From the performance point of view, the iron core will produce a certain degree of deformation and vibration, and this deformation is continuously cyclical, and the size and frequency of the deformation are related to the load of the transformer. When the load of the transformer increases, the amplitude of the iron core deformation will also increase accordingly. Through the above scheme, the drive component is connected to the upper iron yoke. When the upper iron yoke is continuously deformed under the action of the magnetostrictive effect, the drive component will move up and down in a cycle with its frequency, and then drive the pressing component to squeeze the low-voltage winding and the high-voltage winding, thereby accelerating the air flow rate between the low-voltage winding and the high-voltage winding and between the two adjacent windings, thereby enhancing the cooling effect of the transformer.

[0010] Preferably, the driving assembly includes an upper fixed block, a mounting groove, an upper fixed plate, a return spring, a transmission plate, a connecting frame, a driving plate and a through groove, the upper fixed block is connected to the mounting frame, the mounting groove is opened on the upper fixed block, the upper fixed plate is slidably connected in the mounting groove, the return spring is arranged in the mounting groove, and the two ends of the return spring are respectively connected to the mounting groove and the upper fixed plate, the transmission plate is connected above the upper fixed plate, the length of the transmission plate is the same as the width of the upper iron yoke, and the top of the transmission plate is a flexible material, the connecting frame is connected below the upper fixed plate, the driving plate is connected between the two connecting frames, and the through groove is opened on the driving plate.

[0011] Through the above scheme, by setting a transmission plate under the upper iron yoke, when the upper iron yoke undergoes cyclic displacement in the vertical direction, it will push the transmission plate to move, and then transmit the power provided by the upper iron yoke downward and drive the pressing component to work, so that the working frequency of the driving component can be adaptively adjusted according to the frequency of the upper iron yoke. Therefore, when the load of the transformer increases, the heat it generates will also increase, and the working frequency of the pressing component will also increase, thereby enhancing the heat dissipation effect of the transformer; on the other hand, the deformation of the upper iron yoke will also cause the equipment to vibrate, thereby generating noise, and in this scheme, the upper part of the transmission plate is set to a flexible material, so that the transmission plate can play a buffering and shock-absorbing effect to a certain extent, thereby ensuring the service life of the upper iron yoke.

[0012] Preferably, an air induction block is provided on the connecting frame, and the air induction block is in the shape of a right triangle with the inclined surface facing downward.

[0013] Through the above scheme, when the connecting frame moves downward, the air flow will flow upward quickly along the inclined surface of the air induction block. After flowing through the inclined surface, it will flow in the direction close to the connecting frame and briefly stay in the plane area on the upper side of the air induction block. Then, when the connecting frame moves upward, the plane area above the air induction block will rely on its larger surface area to push the air flow to continue to move upward. Combined with the principle of rising hot air flow, it can drive the air flow faster and make it flow out from above the low-voltage winding and the high-voltage winding, thereby enhancing the heat dissipation effect of the transformer.

[0014] Preferably, the fixing assembly includes a lower fixing block, a lower fixing plate, a connecting plate and a mounting plate, the lower fixing block is connected to the mounting frame, the lower fixing plate is connected to the lower fixing block, the connecting plate is connected to the lower fixing plate, the mounting plate is connected to the connecting plate, and the connecting plate is arranged in a through groove.

[0015] Through the above scheme, the upper fixing block and the lower fixing block are respectively located on the upper and lower sides of the low-voltage winding and the high-voltage winding, and are respectively connected to the mounting frame, so that they can assume the role of the original gasket in the transformer. At the same time, the connecting plate is staggeredly connected with the driving plate through the through groove, which can enhance the stability of both.

[0016] Preferably, the upper portion of the upper fixing block is made of metal, and the lower portion of the upper fixing block is epoxy resin; the lower portion of the lower fixing block is made of metal, and the upper portion of the lower fixing block is epoxy resin.

[0017] Through the above scheme, by setting the part of the fixing block close to the mounting frame to metal material, it can be conveniently fixed to the mounting frame, thereby preventing its position from shifting during operation, thereby affecting normal operation; and the side in contact with the low-voltage winding and the high-voltage winding is made of epoxy resin material, which is the same as the casting material of the low-voltage winding and the high-voltage winding, and can act as a pad between the winding and the mounting frame, thereby protecting the low-voltage winding and the high-voltage winding.

[0018] Preferably, a driving block is connected to the driving plate, and the cross-sectional shape of the driving block is semicircular; the pressing assembly includes an extrusion block and a transmission block, the extrusion block is slidably connected to the mounting plate, the transmission block is connected to the extrusion block, and two adjacent groups of transmission blocks and driving blocks are arranged in opposite directions with the same shape.

[0019] Through the above scheme, multiple driving blocks and transmission blocks are arranged on the same driving plate and extrusion block, and the driving blocks and transmission blocks are both arc-shaped, so that they move more smoothly when they are squeezed against each other. During specific operation, the driving block squeezes the transmission block, and then pushes the extrusion block to move in the direction close to the low-voltage winding or the high-voltage winding, thereby squeezing and releasing the winding, and accelerating the gas flow by changing the size of the gap between the low-voltage winding and the high-voltage winding, thereby enhancing the heat dissipation effect of the transformer.

[0020] Preferably, the cross section of the extrusion block is semicircular, and the side with the arc surface is arranged close to the ventilation slot.

[0021] Through the above scheme, the contact surface between the extrusion block and the winding is set to an arc surface, thereby avoiding damage to the winding surface when the extrusion block extrudes the winding. At the same time, the pressure on the winding can be increased by reducing the contact area, thereby increasing the deformation of the winding surface, thereby increasing the amplitude of the gap change between the low-voltage winding and the high-voltage winding, thereby enhancing the air flow between the low-voltage winding and the high-voltage winding and between two adjacent groups of windings, thereby enhancing the ventilation and heat dissipation effect.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. A dry-type transformer for photovoltaic power generation inversion of the present invention connects a driving component to an upper iron yoke so that the operating frequency of the driving component can change with the change of the load of the upper iron yoke. At the same time, the load change of the transformer will also affect the temperature, so that the driving component can change the operating frequency as the temperature of the transformer changes, and the temperature of the low-voltage winding and the high-voltage winding and between two adjacent windings can be maintained within a relatively reasonable range, thereby avoiding the occurrence of problems such as short circuit caused by the damage to the insulation of the equipment caused by the temperature increase.

[0024] 2. A dry-type transformer for photovoltaic power generation inversion of the present invention is provided with a driving component and a pressing component, so that the pressing component can squeeze the low-voltage winding and the high-voltage winding, thereby continuously changing the size of the gap between the low-voltage winding and the high-voltage winding, thereby playing a role similar to that of a blower, accelerating the air flow rate between the low-voltage winding and the high-voltage winding, thereby enhancing the heat dissipation effect of the transformer. In addition, the driving component can buffer the vibration of the upper iron yoke to a certain extent, thereby reducing the noise generated when the transformer is working.

[0025] 3. A dry-type transformer for photovoltaic power generation inversion of the present invention sets the air induction block into a triangular shape with the inclined surface facing downward, so that the air flow can be guided to move upward quickly during the downward movement. When the air induction block moves upward, it will push more air flow upward through the plane area above, so that the air can flow quickly, thereby enhancing the air flow rate between the low-voltage winding and the high-voltage winding, thereby enhancing the heat dissipation effect of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention without installing low-voltage winding and high-voltage winding;

[0027] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the installation positions of the drive assembly and the fixed assembly and the low-voltage winding and the high-voltage winding of the present invention;

[0029] Figure 4 It is a schematic diagram of the installation structure of the driving component, the fixing component and the pressing component of the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the driving assembly of the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of the fixing assembly of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the pressing assembly of the present invention;

[0033] Figure 8 This is a state diagram of the air flow direction driven by the air induced block of the present invention.

[0034] In the figure: 1, mounting frame; 2, fan; 3, lower iron yoke; 4, iron core; 5, upper iron yoke; 6, low-voltage winding; 7, high-voltage winding; 8, ventilation slot; 9, drive assembly; 901, upper fixing block; 902, mounting slot; 903, upper fixing plate; 904, return spring; 905, transmission plate; 906, connecting frame; 907, driving plate; 9071, driving block; 908, through slot; 909, induced draft block; 10, fixing assembly; 1001, lower fixing block; 1002, lower fixing plate; 1003, connecting plate; 1004, mounting plate; 11, pressing assembly; 1101, extrusion block; 1102, transmission block. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 8 The present invention provides a dry-type transformer for photovoltaic power generation inversion, and the technical solution is as follows:

[0037] For details, please refer to Figure 1 to Figure 2 A dry-type transformer for photovoltaic power generation inversion includes a mounting frame 1, a fan 2, a lower iron yoke 3, an iron core 4, an upper iron yoke 5, a low-voltage winding 6, a high-voltage winding 7 and a ventilation slot 8. The mounting frame 1 is made of steel to ensure the stability of the equipment. The fan 2 is connected to the lower side of the mounting frame 1. When the temperature of the transformer reaches a specified temperature, the fan 2 will automatically start and then blow air from the bottom to the top, so that the wind flows between the low-voltage winding 6 and the high-voltage winding 7 and into the ventilation slot 8, thereby taking away the heat between the low-voltage winding 6 and the high-voltage winding 7, and avoiding excessive heat from affecting the insulation performance of the insulating material. The lower iron yoke 3, The iron core 4 and the upper iron yoke 5 are connected to the mounting frame 1. The lower iron yoke 3, the iron core 4 and the upper iron yoke 5 are all composed of silicon steel sheets. When the transformer is working, the iron core 4 will have a magnetostrictive effect, causing the iron core 4 to deform and vibrate to a certain extent. When the load of the transformer increases, the amplitude of the deformation of the iron core 4 will also increase accordingly. The low-voltage winding 6 and the high-voltage winding 7 are sleeved on the outside of the iron core 4 in order from the inside to the outside, and a gap is left between the low-voltage winding 6 and the high-voltage winding 7. The ventilation slots 8 are opened on the low-voltage winding 6 and the high-voltage winding 7, thereby enhancing the air's ability to absorb the heat generated by the low-voltage winding 6 and the high-voltage winding 7;

[0038] It also includes a driving component 9, a fixing component 10 and a pressing component 11. The driving component 9 is connected to the mounting frame 1 and is located below the upper iron yoke 5. The fixing component 10 is connected to the mounting frame 1 and the driving component 9. The pressing component 11 is connected to the fixing component 10. The driving component 9, the fixing component 10 and the pressing component 11 are all arranged between the low-voltage winding 6 and the high-voltage winding 7. When the upper iron yoke 5 is continuously deformed under the action of the magnetostrictive effect, the driving component 9 will move up and down in a cycle with its frequency, thereby pushing the pressing component 11 to squeeze the low-voltage winding 6 and the high-voltage winding 7 at a specified frequency, thereby accelerating the air flow rate between the low-voltage winding 6 and the high-voltage winding 7 and between two adjacent groups of windings, thereby enhancing the cooling effect of the transformer, and the moving frequency of the driving component 9 changes with the change of the transformer load.

[0039] As an embodiment of the present invention, refer to Figures 2 to 5 The drive assembly 9 includes an upper fixed block 901, a mounting groove 902, an upper fixed plate 903, a reset spring 904, a transmission plate 905, a connecting frame 906, a drive plate 907 and a through groove 908. The upper fixed block 901 is fixedly connected to the mounting frame 1. The upper part of the upper fixed block 901 is made of metal material, so that it can be easily fixed to the mounting frame 1, thereby avoiding its position from shifting during operation, thereby affecting normal operation. The lower part of the upper fixed block 901 is epoxy resin, which is the same material as the casting material of the low-voltage winding 6 and the high-voltage winding 7, and can act as a pad between the winding and the mounting frame 1, thereby protecting the low-voltage winding 6 and the high-voltage winding 7, and at the same time, it can play a vibration buffering role for the low-voltage winding 6 and the high-voltage winding 7;

[0040] The mounting groove 902 is provided on the upper fixed block 901, and the upper fixed block 901 is provided with two and respectively arranged at two ends of the upper fixed plate 903, and the upper fixed plate 903 is slidably connected in the mounting groove 902, and the return spring 904 is arranged in the mounting groove 902, and the two ends of the return spring 904 are respectively connected to the mounting groove 902 and the upper fixed plate 903, and the transmission plate 905 is connected above the upper fixed plate 903. When the upper iron yoke 5 undergoes cyclic displacement in the vertical direction, it will push the transmission plate 905 to move, thereby transmitting the power provided by the upper iron yoke 5 downward and driving the pressing component 11 to work, so that the working frequency of the driving component 9 can be adaptively adjusted according to the frequency of the upper iron yoke 5. The length of the transmission plate 905 is the same as the width of the upper iron yoke 5, so that the transmission plate 905 can more effectively receive the power of the upper iron yoke 5, and the upper part of the transmission plate 905 is a flexible material, which can play a buffering and shock-absorbing effect to a certain extent while receiving power, thereby ensuring the service life of the upper iron yoke 5;

[0041] The connecting frame 906 is fixedly connected to the bottom of the upper fixed plate 903, and an air induced draft block 909 is provided on the connecting frame 906. The air induced draft block 909 is in the shape of a right triangle, and the inclined surface is set downward. When the connecting frame 906 moves downward, the air flow will quickly flow upward along the inclined surface of the air induced draft block 909 and stay in the plane area on the upper side of the air induced draft block 909. When the connecting frame 906 moves upward, the plane area above the air induced draft block 909 will push the air flow to continue to move upward, thereby being able to drive the air flow faster and make it flow out from above the low-voltage winding 6 and the high-voltage winding 7, thereby enhancing the heat dissipation effect of the transformer. The driving plate 907 is fixedly connected between the two connecting frames 906, and the through slot 908 is opened on the driving plate 907, and is used in conjunction with the connecting plate 1003 through the through slot 908.

[0042] As an embodiment of the present invention, refer to Figure 2 , Figure 3 and Figure 6 The fixing assembly 10 includes a lower fixing block 1001, a lower fixing plate 1002, a connecting plate 1003 and a mounting plate 1004. The lower end of the lower fixing block 1001 is fixedly connected to the mounting frame 1. The lower fixing block 1001 is provided with two pieces, which have the same installation position as the upper fixing block 901, so that it can assume the original role of the gasket in the transformer. The lower fixing plate 1002 is fixedly connected between the two lower fixing blocks 1001, the connecting plate 1003 is fixedly connected to the lower fixing plate 1002, and the mounting plate 1004 is fixedly connected to the connecting plate 1003. A pressing assembly 11 is installed between each two mounting plates 1004 for pressing the low voltage winding 6 and the high voltage winding 6. The surface of the pressure winding 7 is extruded, and the connecting plate 1003 is arranged in the through groove 908, thereby enhancing the stability of the two during operation; the lower part of the lower fixed block 1001 is made of metal material, so that it can be conveniently fixed to the mounting frame 1, thereby avoiding its position from shifting during operation, thereby affecting normal work; the upper part of the lower fixed block 1001 is epoxy resin, which is the same material as the casting material of the low-voltage winding 6 and the high-voltage winding 7, and can act as a pad between the winding and the mounting frame 1, thereby protecting the low-voltage winding 6 and the high-voltage winding 7, and at the same time can play a vibration buffering role for the low-voltage winding 6 and the high-voltage winding 7.

[0043] As an embodiment of the present invention, refer to Figures 5 to 7, the driving plate 907 is connected with a driving block 9071, and the cross-sectional shape of the driving block 9071 is semicircular; the pressing component 11 includes an extrusion block 1101 and a transmission block 1102, and the cross-sectional shape of the transmission block 1102 is also semicircular. The transmission block 1102 is connected to the extrusion block 1101, and two adjacent groups of the transmission blocks 1102 are arranged in the same shape and opposite directions as the driving block 9071. When the driving block 9071 extrudes the transmission block 1102, the extrusion block 1101 is pushed to move toward the direction close to the low-voltage winding 6 or the high-voltage winding 7, thereby extruding and loosening the winding, and the low-voltage winding 6 and the high-voltage winding 7 are changed. The size of the gap is used to accelerate the gas flow, thereby enhancing the heat dissipation effect of the transformer; the extrusion block 1101 is slidably connected to the mounting plate 1004, the cross-section of the extrusion block 1101 is semicircular, and the side with the arc surface is arranged close to the ventilation slot 8, which can avoid damage to the winding surface when the extrusion block 1101 squeezes the winding. At the same time, it can also increase the pressure on the winding by reducing the contact area, thereby increasing the deformation amplitude of the winding surface, and thereby enhancing the amplitude of the gap change between the low-voltage winding 6 and the high-voltage winding 7, thereby enhancing the air flow between the low-voltage winding 6 and the high-voltage winding 7 and between the two adjacent groups of windings, thereby enhancing the ventilation and heat dissipation effect.

[0044] The specific working principle is: in order to increase the air flow rate in the gap between the low-voltage winding 6 and the high-voltage winding 7, the present scheme is provided with a pressing component 11, and the pressing component 11 is arranged between the low-voltage winding 6 and the high-voltage winding 7, and by squeezing the surface of the low-voltage winding 6 and the high-voltage winding 7 according to a certain rule and frequency, the air gap between the low-voltage winding 6 and the high-voltage winding 7 is continuously changed in size, thereby forming a structure similar to the principle of a manual blower, so that the exchange speed of air between the low-voltage winding 6 and the high-voltage winding 7 and the outside air is accelerated, thereby strengthening the air flow rate between the low-voltage winding 6 and the high-voltage winding 7, and thereby enhancing the heat dissipation effect of the transformer.

[0045] Specifically, when the transformer is working, the load on the upper iron yoke 5 gradually increases. At this time, under the action of the magnetostrictive effect, the upper iron yoke 5 is deformed and then displaced in the vertical direction, thereby pushing the transmission plate 905 to move back and forth in the vertical direction. The transmission plate 905 is fixedly connected to the upper fixed plate 903, so it will drive the upper fixed plate 903 to move. At this time, the upper fixed plate 903 drives the driving block 9071 on the driving plate 907 through the connecting frame 906 to squeeze the transmission block 1102. Since the driving block 9071 and the transmission block 1102 are provided with multiple blocks, the stability of the moving direction of the extrusion block 1101 can be well maintained, so that the extrusion block 1101 can move toward the direction close to the low-voltage winding 6 or the high-voltage winding 7. Move in the direction of the low-voltage winding 6 and the high-voltage winding 7, so that the extrusion block 1101 can squeeze the surface of the low-voltage winding 6 and the high-voltage winding 7, and use the resilience of the low-voltage winding 6 and the high-voltage winding 7 to push back the extrusion block 1101, and repeat this cycle, thereby continuously changing the size of the gap between the low-voltage winding 6 and the high-voltage winding 7, thereby forming a structure similar to the principle of a manual blower to accelerate the gas flow rate between the low-voltage winding 6 and the high-voltage winding 7, and then cool the air between the low-voltage winding 6 and the high-voltage winding 7, thereby ensuring the heat dissipation effect of the transformer; in addition, when the extrusion block 1101 pushes the high-voltage winding 7, it will change the distance between the two adjacent high-voltage windings 7, thereby accelerating the air flow rate between the two groups of high-voltage windings 7, and further improving the heat dissipation effect;

[0046] At the same time, when the connecting frame 906 moves back and forth in the vertical direction, the air induction block 909 on the connecting frame 906 can drive the air flow between the low-voltage winding 6 and the high-voltage winding 7, thereby enhancing the heat dissipation effect. Figure 8 As shown, during specific operation, the connecting frame 906 moves downward, causing the air flow to quickly flow upward along the inclined surface of the air induced block 909, and then stay in the plane area on the upper side of the air induced block 909 as the air induced block 909 briefly pauses. Then, when the connecting frame 906 moves upward, the plane area above the air induced block 909 will rely on its larger surface area to push the air flow to continue to move upward, thereby driving the air flow, thereby accelerating the air flow rate between the low-voltage winding 6 and the high-voltage winding 7, and thereby enhancing the heat dissipation effect of the transformer.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry-type transformer for photovoltaic power generation inversion, comprising a mounting frame (1), a fan (2), a lower iron yoke (3), an iron core (4), an upper iron yoke (5), a low-voltage winding (6), a high-voltage winding (7) and a ventilation slot (8), wherein the fan (2) is connected to the lower side of the mounting frame (1), the lower iron yoke (3), the iron core (4) and the upper iron yoke (5) are all connected to the mounting frame (1), the low-voltage winding (6) and the high-voltage winding (7) are sleeved on the outer side of the iron core (4) in order from inside to outside, and the ventilation slot (8) is opened on the low-voltage winding (6) and the high-voltage winding (7), characterized in that: The invention also comprises a driving component (9), a fixing component (10) and a pressing component (11); the driving component (9) is connected to the mounting frame (1) and is located below the upper iron yoke (5); the fixing component (10) is connected to the mounting frame (1) and the driving component (9); the pressing component (11) is connected to the fixing component (10); the driving component (9), the fixing component (10) and the pressing component (11) are all arranged between the low-voltage winding (6) and the high-voltage winding (7); the upper iron yoke (5) is deformed to drive the driving component (9) to move up and down on the fixing component (10) in a cycle, thereby pushing the pressing component (11) to squeeze the low-voltage winding (6) and the high-voltage winding (7) at a specified frequency; and the movement frequency of the driving component (9) changes with the change of the transformer load.

2. A dry-type transformer for photovoltaic power generation inversion according to claim 1, characterized in that: The driving assembly (9) comprises an upper fixing block (901), a mounting groove (902), an upper fixing plate (903), a return spring (904), a transmission plate (905), a connecting frame (906), a driving plate (907) and a through groove (908); the upper fixing block (901) is connected to the mounting frame (1); the mounting groove (902) is provided on the upper fixing block (901); the upper fixing plate (903) is slidably connected in the mounting groove (902); The return spring (904) is arranged in the installation groove (902), and the two ends of the return spring (904) are respectively connected to the installation groove (902) and the upper fixed plate (903), the transmission plate (905) is connected to the upper part of the upper fixed plate (903), the connecting frame (906) is connected to the lower part of the upper fixed plate (903), the driving plate (907) is connected between the two connecting frames (906), and the through groove (908) is opened on the driving plate (907).

3. A dry-type transformer for photovoltaic power generation inversion according to claim 2, characterized in that: The upper portion of the upper fixing block (901) is made of metal, and the lower portion of the upper fixing block (901) is made of epoxy resin.

4. A dry-type transformer for photovoltaic power generation inversion according to claim 2, characterized in that: The length of the transmission plate (905) is the same as the width of the upper iron yoke (5), and the upper part of the transmission plate (905) is made of flexible material.

5. A dry-type transformer for photovoltaic power generation inversion according to claim 2, characterized in that: The connecting frame (906) is provided with an air induction block (909), and the air induction block (909) is in the shape of a right triangle with the inclined surface facing downward.

6. A dry-type transformer for photovoltaic power generation inversion according to claim 2, characterized in that: The fixing assembly (10) comprises a lower fixing block (1001), a lower fixing plate (1002), a connecting plate (1003) and a mounting plate (1004); the lower fixing block (1001) is connected to the mounting frame (1); the lower fixing plate (1002) is connected to the lower fixing block (1001); the connecting plate (1003) is connected to the lower fixing plate (1002); the mounting plate (1004) is connected to the connecting plate (1003); and the connecting plate (1003) is arranged in a through groove (908).

7. A dry-type transformer for photovoltaic power generation inversion according to claim 6, characterized in that: The lower portion of the lower fixing block (1001) is made of metal, and the upper portion of the lower fixing block (1001) is made of epoxy resin.

8. The dry-type transformer for photovoltaic power generation inversion according to claim 6, characterized in that: The driving plate (907) is connected to a driving block (9071), and the cross-sectional shape of the driving block (9071) is semicircular; the pressing assembly (11) comprises an extrusion block (1101) and a transmission block (1102), the extrusion block (1101) is slidably connected to the mounting plate (1004), and the transmission block (1102) is connected to the extrusion block (1101), and two adjacent groups of the transmission blocks (1102) and the driving blocks (9071) have the same shape and are arranged in opposite directions.

9. A dry-type transformer for photovoltaic power generation inversion according to claim 8, characterized in that: The cross section of the extrusion block (1101) is semicircular, and the side with the curved surface is arranged close to the ventilation slot (8).

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