A photovoltaic inverter

Abstract

The utility model discloses a photovoltaic inverter, including casing, baffle, internal baffle and heat exchanger, the baffle set up in casing, the baffle will casing divide into internal cavity and external cavity, the internal baffle set up in internal cavity, the internal baffle will internal cavity divide into lower cavity and upper cavity, the heat exchanger passes through the baffle, and the both ends of heat exchanger are located in internal cavity and external cavity respectively. Will casing inside portion for two relative independent temperature circulation space up and down, and form relatively independent circulating air duct, increase the air flow rate, improve the heat dissipation capacity.

Description

Technical Field

[0001] This utility model belongs to the field of inverters and relates to a photovoltaic inverter. Background Technology

[0002] String inverters are important power electronic devices widely used in solar photovoltaic power generation systems. Compared with traditional centralized inverters, string inverters offer more flexible design, higher reliability, and better power generation efficiency.

[0003] As the power output of individual string inverters increases, the heat generated by the circuit boards and components inside the inverter chassis also increases. Simultaneously, many temperature-sensitive components, such as capacitors, reside within the chassis, and the internal temperature ultimately determines their performance. Currently, heat dissipation in low-power string inverters primarily relies on natural convection between the chassis and the external environment, along with limited radiation, or simply adding an internal heat exchanger in available space to meet cooling requirements.

[0004] However, this method becomes increasingly limited as inverter power increases. The heat generated inside the cavity can no longer be completely dissipated through the casing or simply by adding a heat exchanger. This will cause the temperature inside the casing to be too high, affecting the lifespan and reliability of internal components, and ultimately affecting the lifespan and reliability of the entire inverter. In more serious cases, it can cause serious problems such as inverter explosion. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a photovoltaic inverter that divides the interior of the casing into two relatively independent temperature circulation spaces, forming relatively independent circulation air ducts, thereby increasing the air circulation rate and improving heat dissipation capacity.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A photovoltaic inverter includes a housing, a partition, an internal partition, and a heat exchanger; The aforementioned partition is disposed within the aforementioned housing, and the aforementioned partition divides the aforementioned housing into an internal cavity and an external cavity; The aforementioned internal partition is disposed within the aforementioned internal cavity, dividing the aforementioned internal cavity into a lower cavity and an upper cavity; a power board is disposed in the aforementioned lower cavity, and an auxiliary power board is disposed in the aforementioned upper cavity; The heat exchanger passes through the partition plate, and its two ends are located in the internal cavity and the external cavity, respectively.

[0007] Optionally, the heat exchanger includes inner cavity fins, outer cavity fins, and heat pipes; the inner cavity fins are disposed in the inner cavity, the outer cavity fins are disposed in the outer cavity, the heat pipes pass through the partition, and the two ends of the heat pipes are respectively connected to the inner cavity fins and the outer cavity fins.

[0008] Optionally, it also includes an internal turbulence fan, which is disposed in the internal cavity, and the airflow blown by the internal turbulence fan flows through the fins of the internal cavity.

[0009] Optionally, the aforementioned internal turbulence fan includes a first internal turbulence fan and a second internal turbulence fan disposed in the lower cavity, and a third internal turbulence fan and a fourth internal turbulence fan disposed in the upper cavity.

[0010] Optionally, it also includes a flow guide shroud disposed in the lower cavity, the flow guide shroud being disposed at the air outlet of the heat exchanger; the first internal turbulence fan and the second internal turbulence fan being disposed on the flow guide shroud.

[0011] Optionally, the first internal turbulence fan and the second internal turbulence fan are symmetrically arranged in the lower cavity, and the air outlet direction of the first internal turbulence fan and the second internal turbulence fan is a counter-blowing arrangement.

[0012] Optionally, the aforementioned external cavity is provided with an air inlet and an air outlet, and an external fan is provided in the aforementioned external cavity.

[0013] Optionally, the third internal turbulence fan and the fourth internal turbulence fan are arranged side by side in the upper cavity.

[0014] Optionally, a heat sink and an inductor are provided in the aforementioned external cavity.

[0015] Optionally, the aforementioned external fan and the cooling fan of the aforementioned radiator are placed side by side.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention employs a double-layer circuit board layout, placing the power board and auxiliary power board in the lower and upper cavities of the inverter respectively. This improves the heat dissipation performance of the power equipment, thereby enhancing its reliability. The layered design divides the interior of the casing into two relatively independent temperature circulation spaces, connected by a heat exchanger to form relatively independent airflow channels. This allows for zoned arrangement and heat exchange of components with different protection levels, increasing airflow rate and improving heat dissipation capacity.

[0017] Furthermore, by using heat pipes as the heat exchange core, the high thermal conductivity of heat pipes can efficiently and quickly transfer heat from the internal cavity to the external cavity, thus improving heat exchange efficiency.

[0018] Furthermore, a turbulence fan is added to the internal cavity to force air to flow through the internal cavity fins, which enhances the convective heat transfer of the internal cavity and significantly improves the internal heat dissipation efficiency.

[0019] Furthermore, turbulence fans are installed in the upper and lower cavities respectively, enabling targeted heat dissipation of heat-generating components in different areas and forming independent circulating air ducts, making heat dissipation more uniform and efficient.

[0020] Furthermore, the addition of a guide shroud can effectively guide the airflow generated by the lower cavity fan to the heat exchanger, allowing for more thorough heat exchange between the hot air and the heat exchanger, thus improving heat exchange efficiency.

[0021] Furthermore, the two fans in the lower cavity are arranged in a counter-flow pattern, which can create stronger internal turbulence, shorten the air path, accelerate the air circulation rate, and allow the heat in the lower cavity to be carried away more quickly.

[0022] Furthermore, air inlets and outlets and an external fan are installed in the external cavity to form a forced air cooling channel, which can efficiently exhaust the heat transferred from the heat exchanger to the outside of the inverter, ensuring the continuous and efficient operation of the overall heat dissipation system.

[0023] Furthermore, by arranging high-heat-generating power boards and temperature-sensitive auxiliary power boards in different cavities, heat source isolation is achieved, heat concentration is avoided, and the reliability and lifespan of components are improved.

[0024] Furthermore, heat-generating components with lower protection requirements, such as heat sinks and inductors, are placed in a ventilated external cavity, where they are directly cooled by the airflow from an external fan. This design is simple and provides good heat dissipation.

[0025] Furthermore, by placing the external fan and the radiator's cooling fan side by side, they can share the air duct, optimizing the spatial layout of the external cavity, making the structure more compact, and providing cooling airflow for both the heat exchanger and the radiator simultaneously. Attached Figure Description

[0026] Figure 1 This is a bottom-view cross-sectional view of the photovoltaic inverter according to an embodiment of the present invention; Figure 2 This is a rear view of the hidden rear cover of the photovoltaic inverter according to an embodiment of the present utility model; Figure 3 This is a right-side sectional view of the photovoltaic inverter according to an embodiment of the present utility model; Figure 4The main view of the photovoltaic inverter of this utility model embodiment without the cover plate is shown below. Figure 5 The main view of the photovoltaic inverter of this embodiment of the present invention with the cover plate removed; Reference numerals: 100, Photovoltaic inverter; 110, Housing; 111, Partition; 112, Internal partition; 113, Rear cover; 114, Internal cavity; 1141, Lower cavity; 1142, Upper cavity; 115, External cavity; 1151, Air inlet; 1152, Air outlet; 1101, First side wall; 1102, Second side wall; 1103, Third side wall; 1104, Fourth side wall; 1105, Fifth side wall; 1106, Sixth side wall; 120, Heat exchanger; 121, Outer cavity fins; 122, Inner cavity fins; 123, Heat exchanger middle partition; 124, Heat pipe; 131, Guide plate; 132, Guide. 1321, Left baffle; 1322, Right baffle; 1323, Fan cover; 141, First external fan; 142, Second external fan; 143, Third external fan; 144, Fourth external fan; 145, Fifth external fan; 146, Sixth external fan; 147, Seventh external fan; 151, First internal turbulence fan; 152, Second internal turbulence fan; 153, Third internal turbulence fan; 154, Fourth internal turbulence fan; 161, Power board; 162, Auxiliary power board; 163, Capacitor board; 171, Boost inductor; 172, Inverter inductor; 181, Heat sink; 191, IGBT. Detailed Implementation

[0027] The present patent will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present patent can be combined with each other.

[0028] The following detailed descriptions are exemplary and intended to provide further detailed explanation of this patent. Unless otherwise specified, all technical terms used in this patent have the same meaning as commonly understood by one of ordinary skill in the art to which this patent pertains. The terminology used in this patent is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this patent.

[0029] like Figures 1-5 As shown, this embodiment of the photovoltaic inverter includes a housing 110 and a heat dissipation structure.

[0030] The housing 110 is provided with a partition 111, which divides the housing 110 into an internal cavity 114 and an external cavity 115; the internal partition 112 divides the internal cavity 114 into a lower cavity 1141 and an upper cavity 1142.

[0031] The heat dissipation structure includes a heat exchanger 120, an air inlet 1151, and an air outlet 1152. The air inlet 1151 is located at one end of the external cavity 115 along the first direction, and the air outlet 1152 is located at the other end of the external cavity 115 along the first direction. The air inlet 1151 and the air outlet 1152 are positioned opposite each other, thereby enabling the external cavity 115 to achieve ventilation.

[0032] The internal cavity 114 has a high protection level and can accommodate devices with high requirements for protection against water, dust, or corrosion. The internal cavity 114 is a sealed cavity. The external cavity 115 has a lower protection level and can accommodate devices with lower requirements for protection against water, dust, or corrosion. The external cavity 115 is a ventilated cavity. The internal cavity 114 houses a power board 161, an auxiliary power board 162, a capacitor board 163, and an IGBT 191. The external cavity 115 houses a heatsink 181 for dissipating heat from the IGBT 191 and an inductor with a heatsink housing.

[0033] The housing 110 has a cuboid structure and includes: a first sidewall 1101, a second sidewall 1102, a third sidewall 1103, a fourth sidewall 1104, a fifth sidewall 1105, and a sixth sidewall 1106. The first sidewall 1101 and the second sidewall 1102 are oriented opposite each other along a first direction; the third sidewall 1103 and the fourth sidewall 1104 are oriented opposite each other along a second direction; and the fifth sidewall 1105 and the sixth sidewall 1106 are oriented opposite each other along a third direction. The minimum included angle between the first and second directions is greater than 0° and less than or equal to 90°, the minimum included angle between the second and third directions is greater than 0° and less than or equal to 90°, and the minimum included angle between the first and third directions is greater than 0° and less than or equal to 90°.

[0034] In some implementations, the first sidewall 1101 is the top wall of the photovoltaic inverter, the second sidewall 1102 is the bottom wall of the photovoltaic inverter, the fifth sidewall 1105 is the front sidewall of the photovoltaic inverter, and the sixth sidewall 1106 is the rear sidewall of the photovoltaic inverter, i.e., the rear cover 113. In this case, the first direction, the second direction, and the third direction are the height direction, width direction, and length direction of the photovoltaic inverter, respectively, and these three directions are perpendicular to each other. Along the first direction, the two ends of the partition 111 are connected to the first sidewall 1101 and the second sidewall 1102, respectively, forming an internal cavity 114 and an external cavity 115 arranged sequentially along the third direction. The internal partition 112 divides the housing 114 into a lower cavity 1141 and an upper cavity 1142, which are also arranged sequentially along the third direction. An air inlet 1151 and an air outlet 1152 are respectively provided on the first side wall 1101 and the second side wall 1102 at positions corresponding to the external cavity 115. The air inlet 1151 and the air outlet 1152 are positioned opposite each other, so that the external cavity 115 can realize the ventilation function.

[0035] Heat exchanger 120 includes fins, a heat exchanger partition 123, heat pipes 124, a guide plate 131, a guide shroud 132, an external fan, and an internal turbulence fan; the fins include outer cavity fins 121 and inner cavity fins 122, the inner cavity fins 122 and the internal turbulence fan are disposed in the inner cavity 114, the outer cavity fins 121 and the external fan are disposed in the outer cavity 115, and the outer cavity fins 121 and the inner cavity fins 122 are arranged parallel to the heat exchanger partition 123; heat exchange... Heat exchanger 120 is mounted on partition 111 of shell 110 via partition 123 in the heat exchanger middle partition 111. Heat exchanger 120 passes through partition 111. The two ends of heat pipe 124 are located in the inner cavity 114 and the outer cavity 115 respectively. Heat pipe 124 is arranged perpendicular to the fins. Air guide shroud 132 is arranged at the air outlet of heat exchanger 120. The inner cavity fins 122 are connected to air guide shroud 132. One end of guide plate 131 is connected to heat exchanger 120, and the other end is connected to external fan.

[0036] The internal turbulence fans include a first internal turbulence fan 151, a second internal turbulence fan 152, a third internal turbulence fan 153, and a fourth internal turbulence fan 154. All four internal turbulence fans are housed within the internal cavity 114. The first internal turbulence fan 151 and the second internal turbulence fan 152 are housed within the lower internal cavity 1141. Both are mounted on the air guide shroud 132 and connected to the air outlet of the heat exchanger 120, enhancing the heat exchange airflow through the inner cavity of the heat exchanger 120. The first internal turbulence fan 151 and the second internal turbulence fan 152 are symmetrically arranged along a second direction within the lower internal cavity 1141 of the inverter, with the air outlets of the two fans arranged in a counter-current configuration. This shortens the airflow path length, accelerates the circulation rate, increases the heat exchange capacity, and helps reduce the internal temperature of the inverter. The third internal turbulence fan 153 and the fourth internal turbulence fan 154 are arranged side by side in the upper cavity 1142 inside the inverter along the first direction, and the airflow direction is uniformly along the second direction to the right side of the inverter, forming a clockwise turbulence circulation in the upper cavity 1142 inside the inverter, thereby uniformly distributing the internal temperature in 1142.

[0037] The external fans include a first external fan 141, a second external fan 142, a third external fan 143, a fourth external fan 144, a fifth external fan 145, a sixth external fan 146, and a seventh external fan 147. The first external fan 141, the second external fan 142, the third external fan 143, the fourth external fan 144, the fifth external fan 145, the sixth external fan 146, and the seventh external fan 147 are all disposed in the external cavity 115 and arranged sequentially along the second direction.

[0038] The high-temperature hot air in the internal cavity is drawn by an internal turbulence fan and fully exchanged with the inner cavity fins 122 in the air guide shroud 132. After cooling, the air circulates in the lower internal cavity 1141. The heat is transferred through the inner cavity fins 122 to the inner cavity of the heat pipe 124. Due to the high thermal conductivity of the heat pipe 124, the heat is quickly transferred to the outer cavity of the heat pipe 124. Then, the heat is transferred to the outer cavity fins 121 by heat conduction. The external fan carries the heat away from above through the guide plate 131, thereby achieving heat dissipation inside the internal cavity 114.

[0039] The design can meet the relevant protection requirements of photovoltaic inverters and further dissipate heat from the air in the internal cavity 114, thereby effectively improving the heat dissipation effect of the internal cavity 114, reducing the risk of failure of internal components in the internal cavity 114, and improving the reliability of photovoltaic inverters.

[0040] In some embodiments, the thickness, spacing, and number of the inner cavity fins 122 and the outer cavity fins 121 can differ. In this embodiment, the inner cavity fins 122 and the outer cavity fins 121 have the same thickness and spacing, but the number of inner cavity fins 122 is greater, meaning the heat dissipation structure 120 has a longer length in the third direction of the internal cavity 112. This arrangement is mainly to reduce internal flow resistance and minimize the impact on internal turbulent airflow.

[0041] The lower internal cavity is equipped with a first internal turbulence fan 151 and a second internal turbulence fan 152. The two fans can achieve sufficient turbulence inside, so that the power board 161, the main component to be cooled in the middle, can be fully cooled.

[0042] The upper cavity is equipped with a third internal turbulence fan 153 and a fourth internal turbulence fan 154. The two fans can achieve sufficient turbulence inside, so that the main heat dissipation components, the auxiliary power board 162 and the capacitor board 163, in the upper cavity can be fully cooled.

[0043] In some implementations, the heat pipe 124 is placed horizontally or at a certain angle to the horizontal direction, with the angle being greater than 0° and less than 90°; the number of heat pipes 124 can be single or multiple. When the heat pipe 124 is placed horizontally, an anti-gravity heat pipe, such as a sintered heat pipe, can be used. When the heat pipe 124 is placed at an angle of 5° to 10°, the overall heat exchange installation does not occupy space, and the thermal conductivity can be enhanced by gravity; in this case, a gravity heat pipe can be used. In this embodiment, the heat pipe is arranged at a 5° angle to the horizontal plane, increasing the effect of gravity to enhance the thermal conductivity of the heat pipe 124. Because the heat pipe 124 is arranged at an angle, it is either a gravity heat pipe (such as a grooved heat pipe) or an anti-gravity heat pipe.

[0044] Regardless of whether the heat pipe 124 is horizontal or at a certain angle, the fins of the inner and outer cavities of the heat exchanger 120 are parallel to the partition plate 123 in the heat exchanger, that is, parallel to the airflow direction inside and outside.

[0045] The heat pipe 124 is connected to the heat exchanger partition 123 via an interference fit and then sealed with silicone sealant, or via brazing. The heat pipe 124 is connected to the inner cavity fins 122 and the outer cavity fins 121 via an interference fit or via brazing. The inner cavity fins 122 and the outer cavity fins 121 are independent fins that are welded separately, or they are crimped together into a single unit and then welded together. The heat exchanger 120 is fixed to the partition 111 via the heat exchanger partition 123; a sealing strip can be added during the fixing process for sealing.

[0046] There can be multiple heat pipes 124 and multiple fins. The thickness of the heat exchanger in the first direction is related to the size of the casing. It can be flexibly configured with matching external fans and internal turbulence fans.

[0047] In this embodiment, other heat exchange components to be cooled can still be connected in series before and after the heat exchanger 120 in the external cavity 115, such as inductors with heat dissipation shells. The inductors with heat dissipation shells include inverter inductors 172 and boost inductors 171. Inverter inductors 172 are arranged sequentially in the second direction and installed near the first sidewall 1101. Boost inductors 171 are arranged sequentially in the second direction and installed near the second sidewall 1102. The portion of the heat exchanger 120 near the sixth sidewall 1106 is placed side by side with the radiator 181 for cooling the IGBT 191 in the second direction. In some embodiments, the number of radiators 181 and external fans can be varied.

[0048] In this embodiment, the airflow guide shroud 132 includes a left baffle 1321, a right baffle 1322, and a top shroud 1323. To enhance internal heat exchange, the airflow guide shroud 132 can be integrated into the heat exchanger 120 or manufactured as a separate structural component. The first internal turbulence fan 151 and the second internal turbulence fan 152 are mounted on the shroud 1323.

[0049] The heat exchanger baffle 123 is generally vertical during inverter operation, but may be slightly tilted due to the suspension or placement of the housing.

[0050] The inner cavity of the heat exchanger 120 is the evaporation end. The hot air in the inner cavity undergoes an internal turbulence circulation process through an internal turbulence fan, achieving heat exchange with the inner cavity fins 122 and heat pipes 124. The heat is then transferred to the outer cavity 113 through the heat pipes 124, and the outer cavity fins 121 and heat pipes 124 exchange heat again through the external fan.

[0051] The external fan of heat exchanger 120 and the cooling fan of radiator 181 are placed side by side, and other inductors with heat dissipation shells to be cooled can be connected in series in the front and rear air paths.

[0052] Furthermore, the heat exchanger 120 has air intake at the bottom of its outer cavity and air outlet at the top or side, with the top outlet having higher heat exchange efficiency.

[0053] A flow guide duct can be installed between the inner cavity of the heat exchanger 120 and the internal turbulence fan support located below the inner cavity to improve the heat exchange efficiency of the heat exchanger 120. At the same time, the influence of the flow area and the fin spacing on the internal turbulence airflow can be minimized by adjusting the flow area.

[0054] The heat exchange mechanism inside heat exchanger 120 is as follows: hot air flows through the device from the top and is cooled and discharged from the bottom through the air duct and internal turbulence fan. The heat exchange mechanism outside heat exchanger 120 is as follows: cold air is drawn in from the bottom and passes through heat exchanger 120, while hot air is discharged from the top. This counter-current arrangement helps improve the heat exchange efficiency of heat exchanger 120.

[0055] In some possible implementations, the first internal turbulence fan 151 is arranged at the angle between the sixth side wall 1106 and the second side wall 1102, and the second internal turbulence fan 152 is arranged at the angle between the fifth side wall 1105 and the first side wall 1101. The second internal turbulence fan serves as the heat exchange fan for the inner cavity of the heat exchanger 120. Baffles are located on both sides of the inner cavity of the heat exchanger 120, restricting the airflow of the second internal turbulence fan 152 to pass only through the heat exchanger 120, and then passing through a guide duct below, allowing the vertically flowing air to exit horizontally or at an angle of 0~180° from the vertical. Furthermore, a guide vane 131 can be added to the air outlet side of the heat exchanger 120 to adjust the airflow direction. This layout ensures that the air flowing through the heat exchanger 120 for heat exchange is from the hotter areas of the inner cavity, improving heat exchange efficiency.

[0056] In some possible implementations, the thickness of the inner cavity of the heat exchanger 120 is greater in the first direction than in other directions. This is because the inner depth of the photovoltaic inverter is greater, and it is matched with a low-head, high-volume internal turbulence fan. This helps with airflow within the chassis, and due to the large flow area inside, the wind resistance is small, minimizing the impact on the turbulence airflow within the photovoltaic inverter. The thickness of the outer cavity of the heat exchanger is less in the first direction than in other directions. This is because the height of the IGBT191 heat sink 181 and the inductor with its heat sink casing is typically low. To fully ensure miniaturization and weight reduction, the thickness of the outer cavity of the heat exchanger 120 in the first direction is chosen to be as small as possible to match the thickness of other external heat dissipation components in the first direction. Simultaneously, an external fan with a smaller airflow but a higher pressure head is selected to improve heat dissipation.

[0057] In this embodiment, an internal turbulence fan draws high-temperature hot air from the internal cavity 114 through a flow guide shroud 132, where it undergoes thorough heat exchange with the inner cavity fins 122. After cooling, the air circulates within the internal cavity 114. The heat is then transferred through the inner cavity fins 122 to the inner cavity of the heat pipe 124. Due to the high thermal conductivity of the heat pipe 124, the heat is rapidly transferred to its outer cavity, and then further conducted to the outer cavity fins 121. Finally, an external fan, passing through the flow guide plate 131, carries the heat away from above, thus achieving heat dissipation for the internal cavity 114. This effectively improves the heat dissipation of the internal cavity 114, thereby reducing the risk of internal component failure and enhancing the reliability of the photovoltaic inverter.

[0058] In this embodiment, the heat exchanger 120 uses a heat pipe 124, which offers high heat exchange efficiency and is simpler and more reliable. Only the partition plate 123 of the heat exchanger through the heat pipe 124 needs to be sealed, requiring fewer gaskets or welds, thus reducing the risk of leakage and providing higher long-term reliability compared to integral brazing. The heat pipe heat exchanger 120 can be manufactured using an interference fit process, eliminating the need for welding and simplifying the manufacturing process. The heat pipe heat exchanger 120 also has low internal flow resistance, which is more conducive to turbulence within the internal cavity 114.

[0059] In this embodiment, the internal cavity 114 of the inverter adopts a double-layer circuit board layout, dividing the inverter interior into a lower cavity 1141 and an upper cavity 1142. The power board and auxiliary power board of the inverter are respectively placed in the lower cavity and the upper cavity to improve the heat dissipation performance of the power equipment, thereby improving the reliability of the power equipment. By setting up the upper and lower layers, the interior of the housing 110 is divided into two relatively independent temperature circulation spaces, forming relatively independent circulation air ducts, thereby increasing the air flow rate and improving the heat dissipation capacity.

[0060] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0061] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0062] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0063] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0064] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

[0065] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed utility model subject matter.

Claims

1. A photovoltaic inverter, characterized in that, It includes a shell (110), a partition (111), an internal partition (112), and a heat exchanger (120). The partition (111) is disposed inside the housing (110), and the partition (111) divides the housing (110) into an inner cavity (114) and an outer cavity (115). The internal partition (112) is disposed within the internal cavity (114), and the internal partition (112) divides the internal cavity (114) into a lower cavity (1141) and an upper cavity (1142); a power board (161) is disposed in the lower cavity (1141), and an auxiliary power board (162) is disposed in the upper cavity (1142). The heat exchanger (120) passes through the partition (111), and the two ends of the heat exchanger (120) are located in the inner cavity (114) and the outer cavity (115), respectively.

2. The photovoltaic inverter according to claim 1, characterized in that, The heat exchanger (120) includes an inner cavity fin (122), an outer cavity fin (121), and a heat pipe (124); the inner cavity fin (122) is disposed in the inner cavity (114), the outer cavity fin (121) is disposed in the outer cavity (115), the heat pipe (124) passes through the partition (111), and the two ends of the heat pipe (124) are respectively connected to the inner cavity fin (122) and the outer cavity fin (121).

3. The photovoltaic inverter according to claim 2, characterized in that, It also includes an internal turbulence fan, which is disposed in the internal cavity (114), and the airflow blown out by the internal turbulence fan flows through the internal cavity fins (122).

4. The photovoltaic inverter according to claim 3, characterized in that, The internal turbulence fans include a first internal turbulence fan (151) and a second internal turbulence fan (152) disposed in the lower cavity (1141), and a third internal turbulence fan (153) and a fourth internal turbulence fan (154) disposed in the upper cavity (1142).

5. The photovoltaic inverter according to claim 4, characterized in that, It also includes a flow guide hood (132) disposed in the lower cavity (1141), the flow guide hood (132) being disposed at the air outlet of the heat exchanger (120); the first internal turbulence fan (151) and the second internal turbulence fan (152) being disposed on the flow guide hood (132).

6. The photovoltaic inverter according to claim 5, characterized in that, The first internal turbulence fan (151) and the second internal turbulence fan (152) are symmetrically arranged in the lower cavity (1141), and the air outlet direction of the first internal turbulence fan (151) and the second internal turbulence fan (152) is a counter-blowing arrangement.

7. The photovoltaic inverter according to claim 4, characterized in that, The third internal turbulence fan (153) and the fourth internal turbulence fan (154) are arranged side by side in the upper cavity (1142).

8. The photovoltaic inverter according to claim 1, characterized in that, The external cavity (115) is provided with an air inlet (1151) and an air outlet (1152), and an external fan is provided in the external cavity (115).

9. The photovoltaic inverter according to claim 8, characterized in that, The external cavity (115) is provided with a heat sink (181) and an inductor.

10. The photovoltaic inverter according to claim 9, characterized in that, The external fan is placed side by side with the cooling fan of the radiator (181).

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