Photovoltaic transformer structure

Abstract

The invention relates to the technical field of photovoltaic transformers, in particular to a photovoltaic transformer structure which comprises a transformer body and a heat dissipation oil pipe, a plurality of heat dissipation fins are arranged on the heat dissipation oil pipe, the photovoltaic transformer structure further comprises a shell, a reciprocating screw rod is arranged in the shell, a motor is arranged on the outer side of the shell, and a sliding block is connected to the reciprocating screw rod. A cooling fan is arranged at the bottom of the sliding block, an air inlet and an air outlet are formed in the top and the bottom of the shell respectively, a frame is connected to the air outlet of the shell, a plurality of louvre blades capable of swinging are arranged in the frame, the swinging direction of the louvre blades is between the inner sides and the outer sides of the cooling fins, and a transmission mechanism is arranged on one side in the shell. Through the integrated design that a motor drives a reciprocating lead screw, a sliding block drives a fan to move, and a transmission mechanism is in linkage with louver blades to swing, full-area sweeping coverage is formed by combining a directional airflow channel and cooling air, the airflow blind area of fin gaps is thoroughly eliminated, and photovoltaic high-temperature and high-load scenes can be effectively dealt with.

Description

Technical Field

[0001] This invention application relates to the field of photovoltaic transformer technology, specifically to a photovoltaic transformer structure. Background Technology

[0002] Photovoltaic transformers are the core power conversion equipment in photovoltaic power plants. They operate outdoors in high temperature and strong radiation environments for extended periods. Furthermore, photovoltaic systems exhibit intermittent load characteristics, such as power fluctuations caused by cloud cover and changes in sunlight intensity. This results in transformers having a "dynamic fluctuation" characteristic in heat generation.

[0003] Chinese Patent Publication No. CN214705658U discloses a highly stable photovoltaic transformer with good heat dissipation performance. The transformer includes a photovoltaic transformer body, multiple heat dissipation fins, terminals, a first heat dissipation mechanism, a second heat dissipation mechanism, and a positioning mechanism. The multiple heat dissipation fins are evenly arranged and installed on the side wall of the photovoltaic transformer body. The terminals are located at the top of the photovoltaic transformer body, and a base is provided at the bottom of the photovoltaic transformer body. A mounting seat is connected to the bottom of the base, and the first heat dissipation mechanism is located at the upper end of the base. This invention, by setting up the first and second heat dissipation mechanisms, allows for continuous heat dissipation using the first heat dissipation mechanism. When the heat inside the photovoltaic transformer body continuously rises and reaches a set value, the second heat dissipation mechanism is activated. At this time, the first and second heat dissipation mechanisms can work simultaneously to ensure good heat dissipation effect.

[0004] However, the aforementioned patent only dissipates heat from the oil pipes through heat dissipation fins, resulting in poor heat dissipation. Existing technologies include installing cooling fans on the heat dissipation fins, but the position of the cooling fans is fixed, and they can only blow air onto local fins. The gaps between adjacent fins are prone to forming airflow dead zones, leading to uneven heat dissipation. During high-temperature periods, local fins accumulate severe heat, affecting cooling efficiency. Summary of the Invention

[0005] To address the aforementioned issues, a photovoltaic transformer structure is provided. Through an integrated design of "motor-driven reciprocating screw + slider-driven fan movement + transmission mechanism-linked louver oscillation", combined with directional airflow channels, cooling air forms a full-area sweeping coverage, completely eliminating airflow blind spots between fins, and can effectively cope with high-temperature and high-load photovoltaic scenarios.

[0006] To address the problems of existing technologies, this invention provides a photovoltaic transformer structure, including a transformer body and a cooling oil pipe disposed on one side of the transformer body. A plurality of cooling fins are equidistantly arranged on the cooling oil pipe for cooling the transformer oil inside the pipe. The structure also includes a housing disposed on one side of the transformer body, located directly above the cooling fins and extending along the distribution direction of the cooling fins. A reciprocating screw is rotatably disposed inside the housing, its axis aligned with the arrangement direction of the cooling fins. A motor is disposed on the outside of the housing, its output end being connected to one end of the reciprocating screw. A slider is connected to the reciprocating screw, which reciprocates with the screw. The rod rotates and moves back and forth along the direction of the heat dissipation fins. A cooling fan is installed at the bottom of the slider, with its air outlet facing the heat dissipation fins. An air inlet and an air outlet are respectively installed at the top and bottom of the housing. A frame is connected to the air outlet of the housing, and several swingable louvers are installed inside the frame. The swing direction is between the inner and outer sides of the heat dissipation fins. A transmission mechanism is installed on one side of the housing, which is connected to the reciprocating screw and several louvers. When the reciprocating screw rotates, it drives the slider to move back and forth, and at the same time, it drives all the louvers to swing synchronously through the transmission mechanism, so that the cooling air covers the entire area of ​​the heat dissipation fins in a swinging manner.

[0007] Preferably, at least two reciprocating lead screws are provided, and a connecting shaft is provided between the two reciprocating lead screws along the axial direction. The two ends of the connecting shaft are respectively fixed coaxially with the two reciprocating lead screws. The end of one of the reciprocating lead screws away from the connecting shaft is connected to the output end of the motor for transmission. The number of cooling fans is the same as that of the reciprocating lead screws and they correspond one-to-one. Each cooling fan is threadedly connected to the corresponding reciprocating lead screw through a corresponding slider.

[0008] Preferably, grooves are provided on both sides of the inner side of the housing along the arrangement direction of the heat dissipation fins, and protrusions are provided on both sides of the cooling fan. The protrusions are slidably adapted to the grooves. When the slider drives the cooling fan to move back and forth, the protrusions slide along the grooves.

[0009] Preferably, the inner cross-section of the housing is funnel-shaped, with the larger diameter end of the funnel-shaped cross-section facing the air outlet and the smaller diameter end facing the air inlet.

[0010] Preferably, the transmission mechanism includes a turntable and an inverted T-shaped rod; The turntable is coaxially fixed at the end of the reciprocating screw away from the motor, and a push pin is fixed at the edge of the turntable; The inverted T-shaped bar includes a vertical section and a horizontal section. A slot is provided at the top of the vertical section, and the actuating pin passes through the slot and can slide along the slot. The transverse section of the inverted T-shaped rod is equipped with a rotating shaft corresponding to each louver blade. One end of the connecting shaft is fixedly connected to the top side of the corresponding louver blade. When the turntable rotates with the reciprocating screw, the actuating pin slides up and down along the strip groove, causing the inverted T-shaped rod to move laterally. In turn, the rotating shaft and the connecting shaft drive all the louvers to swing left and right synchronously.

[0011] Preferably, a dustproof screen is provided at the air inlet of the housing to cover the air inlet. The dustproof screen is a metal filter screen, and the edge of the dustproof screen is detachably connected to the top of the housing by screws.

[0012] Preferably, the heat dissipation fins are S-shaped, with the concave surface of the S-shaped heat dissipation fins facing the heat dissipation oil pipe, and the heat dissipation oil pipe passes through the concave area of ​​the S-shaped heat dissipation fins to increase the contact area between the heat dissipation fins and the heat dissipation oil pipe.

[0013] Preferably, the surface of the heat dissipation fins is coated with a high-radiation heat dissipation coating, which is a metal oxide composite coating.

[0014] Preferably, a rain shield is provided on the top of the housing outside the air inlet, with a gap between the rain shield and the dustproof net. The rain shield extends horizontally away from the heat dissipation fins, and the projected area of ​​the rain shield completely covers the air inlet and the dustproof net to prevent rainwater from splashing into the dustproof net and the housing.

[0015] Preferably, the bottom of the frame is provided with a downward-extending guide channel.

[0016] The advantages of this invention compared to the prior art are: 1. This invention adopts an integrated design of "motor-driven reciprocating screw + slider-driven fan movement + transmission mechanism linkage louver swing", combined with directional airflow channel, the cooling air forms a full area sweep coverage, completely eliminates the airflow blind zone between fins, and can effectively cope with photovoltaic high temperature and high load scenarios.

[0017] 2. This invention uses a multi-fan synchronous transmission design, which eliminates the need for an additional motor, simplifies the drive structure, reduces energy consumption, and increases the cooling air coverage area and blowing intensity.

[0018] 3. The heat dissipation fins of the present invention are designed in an "S" shape, with their concave surface facing the heat dissipation oil pipe. The heat dissipation oil pipe passes through the concave area, changing the contact method between the fins and the oil pipe from the traditional "line contact" to "surface contact", which greatly increases the contact area. At the same time, the "S" shaped structure can form a guiding path for cold air and accelerate the heat dissipation effect. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a photovoltaic transformer structure according to the present invention.

[0020] Figure 2This is a partial cross-sectional view of a photovoltaic transformer structure according to the present invention application. Figure 1 .

[0021] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0022] Figure 4 This is a partial three-dimensional structural cross-sectional view of a photovoltaic transformer structure according to the present invention application.

[0023] Figure 5 This is a partial cross-sectional view of a photovoltaic transformer structure according to the present invention application. Figure 2 .

[0024] Figure 6 yes Figure 5 Enlarged view of section B in the middle.

[0025] Figure 7 This is a partial cross-sectional view of a photovoltaic transformer structure according to the present invention application. Figure 3 .

[0026] Figure 8 This is a three-dimensional structural diagram of the housing, louvers, and rain shield of a photovoltaic transformer structure according to this invention application.

[0027] Figure 9 This is an exploded view of the housing and dustproof mesh of a photovoltaic transformer structure according to this invention application.

[0028] Figure 10 This is a three-dimensional structural diagram of the reciprocating lead screw, cooling fan, transmission mechanism, and louvers of a photovoltaic transformer structure according to this invention application.

[0029] Figure 11 This is a three-dimensional structural diagram of the transmission mechanism of a photovoltaic transformer structure according to the present invention.

[0030] The diagram is labeled as follows: 1. Transformer body; 2. Cooling oil pipe; 3. Cooling fins; 4. Housing; 41. Reciprocating lead screw; 411. Slider; 412. Connecting shaft; 42. Motor; 43. Cooling fan; 431. Protrusion; 44. Air inlet; 441. Dustproof net; 45. Air outlet; 46. Groove; 47. Rain guard; 5. Frame; 51. Louver; 52. Guide channel; 6. Transmission mechanism; 61. Turntable; 611. Actuating pin; 62. Inverted T-shaped rod; 621. Vertical section; 6211. Strip groove; 622. Horizontal section; 6221. Rotating shaft. Detailed Implementation

[0031] To further understand the features, technical means, and specific objectives and functions achieved by this invention application, the invention application will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figures 1 to 7 The diagram shows a photovoltaic transformer structure, including a transformer body 1 and a cooling oil pipe 2 disposed on one side of the transformer body 1. A plurality of cooling fins 3 are equidistantly arranged on the cooling oil pipe 2 for cooling the transformer oil inside the pipe. The structure also includes a housing 4 disposed on one side of the transformer body 1, located directly above the cooling fins 3 and extending along the distribution direction of the cooling fins 3. A reciprocating screw 41 is rotatably disposed inside the housing 4, its axis aligned with the arrangement direction of the cooling fins 3. A motor 42 is disposed on the outside of the housing 4, its output end being connected to one end of the reciprocating screw 41. A slider 411 is connected to the reciprocating screw 41, which rotates along the arrangement of the cooling fins 3 as the reciprocating screw 41 rotates. The slider 411 moves back and forth, and a cooling fan 43 is provided at the bottom of the slider 411. Its air outlet faces the heat dissipation fins 3. An air inlet 44 and an air outlet 45 are provided at the top and bottom of the housing 4, respectively. A frame 5 is connected to the air outlet 45 of the housing 4. Several swingable louvers 51 are provided in the frame 5. The swing direction is between the inner and outer sides of the heat dissipation fins 3. A transmission mechanism 6 is provided on one side of the inside of the housing 4, which is connected to the reciprocating screw 41 and several louvers 51. When the reciprocating screw 41 rotates, it drives the slider 411 to drive the cooling fan 43 to move back and forth. At the same time, the transmission mechanism 6 drives all the louvers 51 to swing in a synchronous manner, so that the cooling air covers the entire area of ​​the heat dissipation fins 3 in a swinging manner.

[0033] Traditional photovoltaic transformers typically employ a fixed cooling fan 43 paired with heat dissipation fins 3 for heat dissipation. With the cooling fan 43 in a fixed position, it can only blow air onto local fins. The gaps between adjacent fins can easily create dead airflow angles, resulting in uneven heat dissipation. During high-temperature periods, some fins accumulate severe heat, affecting cooling efficiency.

[0034] To address the aforementioned issues, this application proceeds through the following process: When the transformer body 1 is running, the heat generated by the internal iron core and windings is transferred to the transformer oil. The hot oil flows into the heat dissipation oil pipe 2 on one side, and the heat is conducted to the heat dissipation fins 3 that are set at equal intervals through the pipe wall. The heat is initially cooled by the natural convection and thermal radiation of the fins and air. The cooled transformer oil then flows back to the body for circulation and heat dissipation.

[0035] The photovoltaic transformer structure also includes a controller and a temperature sensor. The temperature sensor detects the temperature of the heat sink fins 3 and the heat dissipation oil pipe 2 in real time. When the detected temperature reaches a preset threshold, the controller sends a control signal to start the motor 42 on the outside of the housing 4 and the cooling fan 43 at the bottom of the slider 411. The motor 42 is a geared motor 42, which drives the cooling fan 43 and several louvers 51 to move slowly.

[0036] The output of motor 42 drives the reciprocating screw 41 inside housing 4 to rotate. At the same time, external cold air enters housing 4 through the air inlet 44 at the top of housing 4, forming a directional airflow of "upward in and downward out" to avoid airflow turbulence. After being accelerated by cooling fan 43, the airflow flows to the air outlet 45 at the bottom of housing 4. When the reciprocating screw 41 rotates, on the one hand, it drives the slider 411 on the screw to move back and forth along the fin arrangement direction, and simultaneously drives the bottom cooling fan 43 to move laterally, so as to achieve full coverage of air blowing in the lateral area of ​​all cooling fins 3; on the other hand, the reciprocating screw 41 drives several louvers 51 in the air outlet 45 frame 5 to swing back and forth between the inner and outer sides of the fins through the transmission mechanism 6 inside the housing 4, so that the cooling air forms a sweeping airflow of "lateral movement + longitudinal swing", which penetrates into the fin gap and fully covers the inner and outer surfaces of the fins. The sweeping coordinated airflow quickly removes heat from the fin surface, accelerating the cooling efficiency of the transformer oil in the heat dissipation oil pipe 2. The hot air is naturally discharged from the gap between the fins, forming a continuous convection with the cold air in the shell 4. When the temperature sensor detects that the temperature of the heat dissipation fins 3 and the heat dissipation oil pipe 2 has dropped to the preset lower limit threshold, the controller controls the motor 42 and the cooling fan 43 to stop, returning to the natural heat dissipation state, achieving dynamic and efficient heat dissipation.

[0037] Through the integrated design of "motor 42 driving reciprocating screw 41 + slider 411 driving fan movement + transmission mechanism 6 linking louver 51 swinging", combined with directional airflow channel, cooling air forms a full-area sweeping coverage, completely eliminating the airflow blind zone between fins, which can effectively cope with high temperature and high load photovoltaic scenarios.

[0038] Reference Figure 7 and Figure 10 As shown: There are at least two reciprocating lead screws 41. A connecting shaft 412 is provided between the two reciprocating lead screws 41 along the axial direction. The two ends of the connecting shaft 412 are respectively fixed coaxially with the two reciprocating lead screws 41. One end of one of the reciprocating lead screws 41 away from the connecting shaft 412 is connected to the output end of the motor 42 for transmission. The number of cooling fans 43 is the same as that of the reciprocating lead screws 41 and they correspond one-to-one. Each cooling fan 43 is threadedly connected to the corresponding reciprocating lead screw 41 through the corresponding slider 411.

[0039] At least two reciprocating lead screws 41 are provided, which are coaxially fixed and rotate synchronously through an axial connecting shaft 412. Only one motor 42 is needed to drive all the reciprocating lead screws 41. Each reciprocating lead screw 41 corresponds to a cooling fan 43. The fan is threadedly connected to the lead screw through a slider 411 and moves synchronously back and forth with the rotation of the lead screw. Multiple fans work in parallel to expand the coverage and blowing intensity of the cooling air.

[0040] The multi-fan synchronous drive design eliminates the need for an additional motor, simplifies the drive structure, reduces energy consumption, and increases the cooling air coverage area and airflow intensity.

[0041] Reference Figure 4 and Figure 6 As shown: The inner sides of the housing 4 are provided with grooves 46 along the arrangement direction of the heat dissipation fins 3. The two side walls of the cooling fan 43 are provided with protrusions 431. The protrusions 431 are slidably adapted to the grooves 46. When the slider 411 drives the cooling fan 43 to move back and forth, the protrusions 431 slide along the grooves 46.

[0042] The protrusions 431 on both sides of the cooling fan 43 are embedded in the grooves 46 on both sides of the housing 4. When the slider 411 drives the fan to move back and forth along the reciprocating screw 41, the protrusions 431 slide synchronously along the grooves 46 to form a guiding constraint, so as to avoid the fan from deviating, jamming or shaking when it moves, and to ensure that the fan moves smoothly and accurately, and avoids the air blowing misalignment caused by deviation.

[0043] Reference Figure 3 and Figure 6 As shown: the inner cross-section of the housing 4 is funnel-shaped, with the large diameter end of the funnel-shaped cross-section facing the air outlet 45 and the small diameter end facing the air inlet 44.

[0044] The inner cross-section of the housing 4 is funnel-shaped, with the small diameter end facing the air inlet 44 and the large diameter end facing the air outlet 45. After the external cold air is gathered through the small diameter air inlet 44, it forms a concentrated airflow that flows to the cooling fan 43 and then diffuses to the louver 51 area through the large diameter air outlet 45, thereby improving the airflow speed and distribution uniformity.

[0045] Reference Figure 5 , Figure 6 , Figure 7 and Figure 10 As shown: The transmission mechanism 6 includes a turntable 61 and an inverted T-shaped rod 62; The turntable 61 is coaxially fixed at the end of the reciprocating screw 41 away from the motor 42, and a toggle pin 611 is fixed at the edge of the turntable 61. The inverted T-shaped rod 62 includes a vertical section 621 and a horizontal section 622. The top of the vertical section 621 is provided with a strip groove 6211, and the actuating pin 611 passes through the strip groove 6211 and can slide along the strip groove 6211. The transverse section 622 of the inverted T-shaped rod 62 is rotatably provided with a rotating shaft 6221 corresponding to each louver 51. One end of the connecting shaft 412 is fixedly connected to the top side of the corresponding louver 51. When the turntable 61 rotates with the reciprocating screw 41, the actuating pin 611 slides up and down along the strip groove 6211, driving the inverted T-shaped rod 62 to move laterally, and then driving all the louvers 51 to swing left and right synchronously through the rotating shaft 6221 and the connecting shaft 412.

[0046] Motor 42 drives reciprocating screw 41 to rotate. Since turntable 61 is coaxially fixed with reciprocating screw 41, turntable 61 moves in a circular motion synchronously with reciprocating screw 41, which drives the edge actuating pin 611 to move in a circular motion synchronously. When the actuating pin 611 moves in a circular motion with the turntable 61, its trajectory is circular. Since the actuating pin 611 passes through the strip groove 6211 of the vertical section 621 of the inverted T-shaped rod 62, and the strip groove 6211 only extends vertically, the circular motion of the actuating pin 611 is restricted to "sliding up and down along the strip groove 6211". At the same time, during the sliding process, the actuating pin 611 generates a lateral thrust on the side wall of the strip groove 6211, which drives the inverted T-shaped rod 62 as a whole to make reciprocating motion up, down and left and right.

[0047] The horizontal section 622 of the inverted T-shaped rod 62 moves synchronously up, down, left, and right with the vertical section 621, driving all the rotating shafts 6221 installed on the horizontal section 622 to move synchronously. Since the rotating shaft 6221 is rotatably set on the horizontal section 622, one end of which is fixedly connected to the louver 51, and the middle and lower section of the louver 51 is provided with a rotating rod that is rotatably connected to the frame 5, the horizontal movement of the rotating shaft 6221 is converted into a torque that drives the louver 51 to rotate around its own rotating rod, ultimately realizing that all the louvers 51 swing synchronously left and right, realizing the synchronous linkage between the louvers 51 and the cooling fan 43, ensuring the coordination between the swing of the cooling air and the movement of the cooling fan 43, forming an efficient sweeping airflow.

[0048] Reference Figure 3 and Figure 9 As shown: A dustproof net 441 is provided at the air inlet 44 of the housing 4 to cover the air inlet 44. The dustproof net 441 is a metal filter. The edge of the dustproof net 441 is detachably connected to the top of the housing 4 by screws.

[0049] The metal dustproof mesh 441 at the air inlet 44 of the housing 4 completely covers the air inlet 44. When cold air enters the housing 4, the dustproof mesh 441 filters the sand and dust and debris in the air, preventing them from entering the housing 4 and contaminating the transmission mechanism 6, the fan, or clogging the fin gaps. The dustproof mesh 441 is detachably connected by screws, which is convenient for regular disassembly, cleaning, or replacement.

[0050] Reference Figure 2 , Figure 4 , Figure 5 and Figure 7 As shown: The heat dissipation fin 3 is S-shaped, and the concave surface of the S-shaped heat dissipation fin 3 faces the heat dissipation oil pipe 2. The heat dissipation oil pipe 2 passes through the concave area of ​​the S-shaped heat dissipation fin 3 to increase the contact area between the heat dissipation fin 3 and the heat dissipation oil pipe 2.

[0051] The heat dissipation fins 3 are designed in an "S" shape, with their concave surface facing the heat dissipation oil pipe 2. The heat dissipation oil pipe 2 passes through the concave area, changing the contact method between the fins and the oil pipe from the traditional "line contact" to "surface contact", which greatly increases the contact area. At the same time, the "S" shaped structure can form a guiding path for cold air and accelerate the heat dissipation effect.

[0052] Reference Figures 1 to 7 As shown: The surface of the heat dissipation fin 3 is coated with a high-radiation heat dissipation coating, which is a metal oxide composite coating.

[0053] The metal oxide composite high-emissivity heat dissipation coating on the surface of heat dissipation fin 3 has high emissivity characteristics, which can quickly dissipate the heat absorbed by the fins to the surrounding environment in the form of thermal radiation. Especially at night or in low wind speed scenarios, it enhances the radiative heat dissipation effect and makes up for the inadequacy of natural convection heat dissipation.

[0054] Reference Figures 1 to 7 As shown: A rain shield 47 is provided on the top of the housing 4 outside the air inlet 44. There is a gap between the rain shield 47 and the dustproof net 441. The rain shield 47 extends horizontally away from the heat dissipation fins 3. The projected area of ​​the rain shield 47 completely covers the air inlet 44 and the dustproof net 441, which is used to prevent rainwater from splashing into the dustproof net 441 and the housing 4.

[0055] The rain shield 47 on the outer side of the air inlet 44 at the top of the housing 4 extends horizontally away from the heat dissipation fins 3. Its projected area completely covers the air inlet 44 and the dustproof net 441, which can prevent rainwater from splashing directly onto the surface of the dustproof net 441 and the inside of the housing 4. A gap is reserved between the rain shield 47 and the dustproof net 441 to ensure that cold air can enter the housing 4 smoothly and avoid blocking the air intake channel.

[0056] Reference Figure 3 , Figure 7 and Figure 8 As shown: The bottom of frame 5 is provided with a downward-extending guide channel 52.

[0057] The guide channel 52 extending downward from the bottom of the frame 5 gathers and guides the cooling air after the louvers 51 swing, so that the airflow is concentrated and blown towards the gap area of ​​the heat dissipation fins 3, avoiding the diffusion and loss of cooling air, ensuring that the airflow can penetrate into the gap between the fins and make full contact with the surface of the heat dissipation fins 3.

[0058] The above embodiments only illustrate one or more implementation methods of this invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this invention, and these all fall within the protection scope of this invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A photovoltaic transformer structure, comprising a transformer body (1) and a heat dissipation oil pipe (2) arranged on one side of the transformer body (1), a plurality of heat dissipation fins (3) being arranged equidistantly on the heat dissipation oil pipe (2) and used for cooling transformer oil in the heat dissipation oil pipe (2), characterized in that, It also includes a housing (4) located on one side of the transformer body (1), the housing (4) being directly above the heat dissipation fins (3), the housing (4) extending along the distribution direction of the heat dissipation fins (3), a reciprocating screw (41) being rotatably installed inside the housing (4), the axis of which is consistent with the arrangement direction of the heat dissipation fins (3), a motor (42) being installed on the outside of the housing (4), the output end of which is connected to one end of the reciprocating screw (41), a slider (411) being connected to the reciprocating screw (41), which can reciprocate along the arrangement direction of the heat dissipation fins (3) as the reciprocating screw (41) rotates, a cooling fan (43) being installed at the bottom of the slider (411), the air outlet of which faces the heat dissipation fins (3), the housing ( 4) has an air inlet (44) and an air outlet (45) at its top and bottom respectively. A frame (5) is connected to the air outlet (45) of the housing (4). Several swingable louvers (51) are provided inside the frame (5). The swing direction is between the inner and outer sides of the heat dissipation fins (3). A transmission mechanism (6) is provided on one side of the inside of the housing (4) and is connected to the reciprocating screw (41) and several louvers (51) respectively. When the reciprocating screw (41) rotates, the drive slider (411) drives the heat dissipation fan (43) to move back and forth. At the same time, the transmission mechanism (6) drives all the louvers (51) to swing, so that the cooling air covers the entire area of ​​the heat dissipation fins (3) in a swinging manner.

2. A photovoltaic transformer structure according to claim 1, wherein, At least two reciprocating lead screws (41) are provided. A connecting shaft (412) is provided between the two reciprocating lead screws (41) along the axial direction. The two ends of the connecting shaft (412) are coaxially fixed with the two reciprocating lead screws (41). One end of one of the reciprocating lead screws (41) away from the connecting shaft (412) is connected to the output end of the motor (42) for transmission. The number of cooling fans (43) is the same as that of the reciprocating lead screws (41) and they correspond one-to-one. Each cooling fan (43) is threadedly connected to the corresponding reciprocating lead screw (41) through the corresponding slider (411).

3. A photovoltaic transformer structure according to claim 1, wherein, The inner sides of the housing (4) are provided with grooves (46) along the arrangement direction of the heat dissipation fins (3), and the two side walls of the cooling fan (43) are provided with protrusions (431). The protrusions (431) and the grooves (46) are slidably matched. When the slider (411) drives the cooling fan (43) to move back and forth, the protrusions (431) slide along the grooves (46).

4. A photovoltaic transformer structure according to claim 1, wherein, The inner cross section of the shell (4) is trumpet-shaped, with the large diameter end of the trumpet-shaped cross section facing the air outlet (45) and the small diameter end facing the air inlet (44).

5. A photovoltaic transformer structure according to claim 1, wherein, The transmission mechanism (6) includes a turntable (61) and an inverted T-shaped rod (62); The turntable (61) is coaxially fixed at the end of the reciprocating screw (41) away from the motor (42), and a toggle pin (611) is fixed at the edge of the turntable (61). The inverted T-shaped rod (62) includes a vertical section (621) and a horizontal section (622). The top of the vertical section (621) is provided with a strip groove (6211). The actuating pin (611) passes through the strip groove (6211) and can slide along the strip groove (6211). The transverse section (622) of the inverted T-shaped rod (62) is rotatably equipped with a rotating shaft (6221) corresponding to each louver (51). One end of the connecting shaft (412) is fixedly connected to the top side of the corresponding louver (51). When the turntable (61) rotates with the reciprocating screw (41), the actuating pin (611) slides up and down along the strip groove (6211), driving the inverted T-shaped rod (62) to move laterally, and then driving all the louvers (51) to swing left and right synchronously through the rotating shaft (6221) and the connecting shaft (412).

6. A photovoltaic transformer structure according to claim 1, wherein, A dustproof net (441) covering the air inlet (44) of the housing (4) is provided. The dustproof net (441) is a metal filter. The edge of the dustproof net (441) is detachably connected to the top of the housing (4) by screws.

7. A photovoltaic transformer structure according to claim 1, wherein The heat dissipation fins (3) are S-shaped, and the concave surface of the S-shaped heat dissipation fins (3) faces the heat dissipation oil pipe (2). The heat dissipation oil pipe (2) passes through the concave area of ​​the S-shaped heat dissipation fins (3) to increase the contact area between the heat dissipation fins (3) and the heat dissipation oil pipe (2).

8. A photovoltaic transformer structure according to claim 1, wherein, The surface of the heat dissipation fins (3) is coated with a high-radiation heat dissipation coating, which is a metal oxide composite coating.

9. A photovoltaic transformer structure according to claim 1, wherein, The top of the housing (4) is provided with a rain shield (47) outside the air inlet (44). There is a gap between the rain shield (47) and the dustproof net (441). The rain shield (47) extends horizontally away from the heat dissipation fins (3). The projected area of ​​the rain shield (47) completely covers the air inlet (44) and the dustproof net (441) to prevent rainwater from splashing into the dustproof net (441) and the housing (4).

10. A photovoltaic transformer structure according to claim 1, wherein, The bottom of the frame (5) is provided with a downward-extending guide channel (52).

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