Photovoltaic coupling box

Abstract

The utility model relates to the technical field of power distribution equipment, in particular to a photovoltaic coupling box. The photovoltaic coupling box comprises a machine shell, a cooling fan and an electric appliance box. The electric appliance box comprises a shell, a partition plate is arranged in the shell and divides the interior of the shell into a first cavity located on the lower portion and a second cavity located on the upper portion, the heating value of a first electric appliance assembly in the first cavity is smaller than that of a DC-DC converter in the second cavity, and a second air inlet is formed in the bottom of the first cavity. The first air inlet is formed in one side of the first cavity, the second air outlet is formed in one side of the second cavity, a ventilation opening communicating the first cavity with the second cavity is formed in the partition plate, and the ventilation opening and the second air inlet are formed in the two ends of the body diagonal line of the first cavity respectively. After the hot air flow is formed in the second cavity, the hot air flow is quickly discharged from the top of the machine shell, a smooth heat exchange channel is formed, the heat dissipation efficiency is improved, and the temperature in the machine shell is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power distribution equipment, and particularly relates to a photovoltaic coupling box. BACKGROUND

[0002] Solar energy is an important clean energy, which is renewable and almost emission-free, and can significantly reduce the carbon emissions of household appliances and reduce the dependence on traditional energy.

[0003] Solar energy is converted into electric energy through a photovoltaic system, and the photovoltaic coupling box realizes the integration of electrical appliances, energy distribution and safety protection between the photovoltaic system and household appliances, and provides stable and reliable power supply for household appliances.

[0004] The existing photovoltaic coupling box has unreasonable internal electronic device layout, especially the high-heat electronic devices in the electrical appliance box are not in the heat dissipation channel, so that the airflow cannot effectively cool the high-heat electronic devices, causing overheating in the local area and affecting the stability and service life of the electronic devices. SUMMARY

[0005] The present application provides a photovoltaic coupling box, which has relatively reasonable internal electronic device layout, and the cooling airflow can effectively cool the high-heat devices.

[0006] A photovoltaic coupling box comprises:

[0007] A cabinet comprising a cabinet air inlet and a cabinet air outlet, the cabinet air inlet is arranged at the lower part of the cabinet, and the cabinet air outlet is arranged at the top of the cabinet;

[0008] A cooling fan arranged inside the cabinet, the cooling fan is arranged close to the cabinet air outlet;

[0009] An electrical appliance box arranged inside the cabinet, the electrical appliance box comprises:

[0010] A shell, a partition plate is arranged inside the shell, the partition plate divides the shell into two chambers, the lower chamber is a first chamber, and the upper chamber is a second chamber;

[0011] A first electrical component arranged in the first chamber;

[0012] A DC-DC converter arranged in the second chamber, the DC-DC converter is used for converting the direct-current voltage output by the photovoltaic system into a direct-current voltage suitable for the inverter, and the heat dissipation of the DC-DC converter is greater than that of the first electrical component;

[0013] A second air inlet arranged at the bottom of the first chamber;

[0014] A second air outlet arranged at one side of the second chamber;

[0015] The ventilation opening is arranged on the partition plate, and the ventilation opening is communicated with the first chamber and the second chamber, and the ventilation opening and the second air inlet are arranged at two ends of a body diagonal line of the first chamber respectively;

[0016] The third air inlet is arranged at one end of the DC-DC converter close to the ventilation opening;

[0017] The third air outlet is arranged at one end of the DC-DC converter close to the second air outlet;

[0018] Through the operation of the cooling fan, a negative pressure environment is formed in the shell, external air is introduced into the shell through the shell air inlet, the air in the shell enters the first chamber through the second air inlet, the airflow can be forced to penetrate through the three-dimensional space of the first chamber, and the airflow after cooling the first electrical component forms an airflow with a temperature lower than the heat dissipation temperature of the second electrical component. The airflow enters the second chamber from the ventilation opening, enters the DC-DC converter through the third air inlet, and forms a hot airflow after cooling all components in the DC-DC converter. The hot airflow flows out from the third air outlet and is discharged to the outside of the shell in sequence through the second air outlet and the shell air outlet under the action of the top cooling fan.

[0019] The application sets the second air outlet of the electrical appliance box at the top by arranging the cooling fan at the top of the shell, rearranges the electrical components in the electrical appliance box according to the heat dissipation amount, and quickly discharges the hot airflow from the top of the shell after the formation of the second chamber, so that a smooth heat exchange channel is formed, the heat dissipation efficiency is improved, and the temperature in the shell is effectively reduced.

[0020] In some embodiments, a wind guide is arranged on the DC-DC converter, the wind guide forms a wind guide channel, the wind guide is arranged close to the third air outlet, and the wind guide guides the hot airflow flowing out from the third air outlet to the second air outlet through the wind guide channel.

[0021] In some embodiments, a wind blocking part is arranged between the wind guide and the shell, the wind blocking part is used for blocking the gap between the outer circumferential side of the converter and the shell, and preventing the hot air flowing out from the third air outlet from flowing back to the ventilation opening, thereby affecting the heat dissipation effect of the first electrical component in the first chamber.

[0022] In some embodiments, a water blocking strip is arranged below the second air outlet, the water blocking strip is used for blocking the water vapor in the air flowing upwards along the shell, and preventing the water vapor from entering the second chamber through the second air outlet.

[0023] In some embodiments, an opening part is arranged on the front side of the shell, the opening part is arranged away from the shell air inlet, a door body is arranged on the opening part, the door body is rotatably connected to the opening of the shell, and the door body is used for opening and closing the opening part.

[0024] In some embodiments, a water blocking assembly is arranged in the shell and arranged at the second air inlet to block water vapor entering from the second air inlet.

[0025] In some embodiments, the height of the machine case air inlet is lower than the height of the second air inlet, so that the air flow entering the machine case from the machine case air inlet is located at the bottom of the shell, and the air flow entering the shell from the second air inlet sequentially cools the first electrical component and the DC-DC converter when flowing upwards under the action of the top cooling fan.

[0026] In some embodiments, the machine case air inlet is an array of ventilation holes or a louver structure, which can ensure smooth air intake and prevent rodents such as mice from invading, thereby improving the synergy of heat dissipation and protection of the machine case.

[0027] In some embodiments, a removable access panel is arranged on the machine case, the access panel is arranged opposite to the machine case air inlet, and the access panel is used to open or close the machine case to facilitate the maintenance of the internal equipment.

[0028] The application also provides a photovoltaic coupling box, comprising:

[0029] A machine case comprising a machine case air inlet and a machine case air outlet, the machine case air inlet is arranged below the machine case, and the machine case air outlet is arranged at the top of the machine case;

[0030] A cooling fan arranged inside the machine case, the cooling fan is arranged close to the machine case air outlet;

[0031] An electrical box arranged inside the machine case, the bottom of the electrical box is provided with a second air outlet, and the top of the electrical box is provided with a second air outlet;

[0032] The electrical box comprises:

[0033] A shell, the inside of the shell is provided with a partition plate, the partition plate divides the inside of the shell into a first chamber and a second chamber which are in communication with each other;

[0034] A first electrical component arranged in the first chamber;

[0035] A DC-DC converter arranged in the second chamber, the DC-DC converter is used to convert the direct current voltage output by the photovoltaic system into a direct current voltage suitable for the inverter, and the heat dissipation of the DC-DC converter is greater than that of the first electrical component;

[0036] The machine case air inlet, the second air inlet, the first chamber, the second chamber, the second air outlet, and the machine case air outlet form a heat dissipation channel of the electrical box;

[0037] The first chamber is located in front of the heat dissipation channel of the electric appliance box, and the second chamber is located behind the heat dissipation channel of the electric appliance box. Air enters the first chamber through the second air inlet, forms an air flow with a temperature lower than the heat dissipation temperature of the second electric appliance component, and then enters the second chamber to form hot air after passing through the DC-DC converter. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 A schematic diagram of a photovoltaic coupling box according to some embodiments is shown;

[0039] Figure 2 A schematic diagram of a photovoltaic coupling box according to some embodiments is shown;

[0040] Figure 3 A schematic diagram of the structure inside the casing according to some embodiments is shown;

[0041] Figure 4 A schematic diagram of the structure inside the casing according to some embodiments is shown;

[0042] Figure 5 A schematic diagram of the internal structure of the electric appliance box and the air flow path according to some embodiments is shown;

[0043] Figure 6 A schematic diagram of the structure of the bracket according to some embodiments is shown;

[0044] Figure 7 A schematic diagram of the positional relationship between the DC-DC converter and the partition according to some embodiments is shown;

[0045] Figure 8 A schematic diagram of the positional relationship between the DC-DC converter and the partition according to some embodiments is shown;

[0046] Figure 9 A schematic diagram of the structure of the air guide according to some embodiments is shown;

[0047] Figure 10 A schematic diagram of the positional relationship between the electric appliance box and the inverter according to some embodiments is shown;

[0048] Figure 11 A schematic diagram of the structure of the inverter according to some embodiments is shown;

[0049] Figure 12 A schematic diagram of the position of the water blocking assembly in the casing according to some embodiments is shown;

[0050] Figure 13 A schematic diagram of the structure of the water blocking assembly according to some embodiments is shown;

[0051] Figure 14A structural schematic diagram showing another perspective of the water blocking assembly according to some embodiments is shown.

[0052] Figure 15 A structural schematic diagram showing the dust cover according to some embodiments is shown.

[0053] Figure 16 A structural schematic diagram showing the access panel when disassembled according to some embodiments is shown. DETAILED DESCRIPTION

[0054] For the purpose of clarity and a thorough understanding of the application, the application will be described in greater detail with reference to the drawings, in which:

[0055] In the description of the application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0056] The terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, unless otherwise specified, "a plurality of" means two or more.

[0057] In the description of the application, it needs to be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0058] In the present application, the photovoltaic coupling box is coupled between the photovoltaic system and the household appliance. In the present embodiment, the photovoltaic coupling box coupled between the photovoltaic system and the multi-connected air conditioning unit is taken as an example to explain its function. The photovoltaic coupling box can identify the air conditioning system connected to the photovoltaic system in the multi-connected air conditioning unit, collect the electric energy converted by the photovoltaic system, and distribute the electric energy converted by the photovoltaic system to the air conditioning system connected to the photovoltaic system according to the power demand of the multi-connected air conditioning unit.

[0059] A photovoltaic system converts solar energy into electric energy, the photovoltaic system includes a plurality of photovoltaic panels, and the photovoltaic system outputs direct current.

[0060] The photovoltaic coupling box includes a current collection system, a main control board and an air conditioner shunt system. The air conditioner shunt system includes a first switch, a second switch, an nth switch and a signal detection unit. The signal detection unit is configured to detect whether the air conditioning system in the multi-connected air conditioning unit is connected to the photovoltaic system. For example, when the detection value of the signal detection unit is 0, it indicates that the air conditioning system is not connected to the photovoltaic system, and when the detection value of the signal detection unit is not 0, it indicates that the air conditioning system is connected to the photovoltaic system. The signal detection unit 214 may be, for example, a current sensor.

[0061] The photovoltaic coupling box is coupled between the photovoltaic system and the multi-connected air conditioning unit. The output end of the current collection system is coupled to the input end of the air conditioner shunt system through a busbar. The output end of the air conditioner shunt system is coupled to the input end of the multi-connected air conditioning unit. The power grid is coupled to at least the main control board and the multi-connected air conditioning unit. The multi-connected air conditioning unit includes air conditioning system 1, air conditioning system 2, air conditioning system 3, a first switch, a second switch, and an nth switch. Wherein, n represents the number of air conditioning systems in the multi-connected air conditioning unit, and n is an integer greater than or equal to 2.

[0062] The current collection system collects direct current generated by the photovoltaic system.

[0063] The main control board identifies the air conditioning system connected to the photovoltaic system in the multi-connected air conditioning unit and obtains the power demand of each air conditioning system connected to the photovoltaic system. According to the relationship between the photovoltaic power of the photovoltaic system and the power demand of each air conditioning system, the power supply mode of the air conditioning system connected to the photovoltaic system is determined. The power supply mode includes direct current power supply from the photovoltaic system to the air conditioning system and alternating current power supply from the power grid to the air conditioning system. The power grid supplies power to the multi-connected air conditioning unit.

[0064] There are many electronic devices in the photovoltaic coupling box, and the heat dissipation amounts are different. If the high-heat electronic devices are not in the heat dissipation channel, the air flow entering the photovoltaic coupling box from the outside cannot effectively cool them, causing the temperature in the local area to be too high, affecting the stability and service life of the electronic devices.

[0065] To solve the above problems, some embodiments of the present application provide a photovoltaic coupling box.

[0066] Referring to Figure 1 As shown in the figure, the photovoltaic coupling box includes a casing 10 for forming the overall appearance of the photovoltaic coupling box. The casing 10 is provided with a casing air inlet 11 and a casing air outlet 12. The casing air inlet 11 is located below the casing 10 and communicates with the outside space.

[0067] The top opening of the housing 10 is the housing air outlet 12. The housing air inlet 11 and the housing air outlet 12 are connected to the internal space enclosed by the housing. External air enters the housing 10 from the housing air inlet 11, cools the electrical equipment inside the housing, and is then discharged from the top housing air outlet 12.

[0068] A cooling fan 20 is installed on the top of the casing 10. The cooling fan 20 is located near the air outlet 12 of the casing and can quickly exhaust the hot airflow discharged from the air outlet 12 of the casing.

[0069] In this application, the housing 10 has its rear side facing the air outlet 12, and the front side facing the air outlet 12. Figures 1-2 As shown.

[0070] In some embodiments, an inverter 30 is disposed inside the casing 10. The inverter 30 is used to convert the direct current output by the photovoltaic system into alternating current and store it. The stored alternating current is used to supply power to the multi-split air conditioning unit, such as... Figures 3-4 As shown, the inverter 30 has a first air inlet 31 at its bottom and a first air outlet 32 ​​at its top.

[0071] An electrical box 40 is also housed inside the casing 10, and the electrical box 40 is arranged adjacent to the inverter 30. For example... Figure 5 As shown, the electrical box 40 includes a first chamber 41 and a second chamber 42. The first chamber 41 is located below the second chamber 42. A second air inlet 411 is provided at the bottom of the first chamber 41, and a second air outlet 421 is provided on one side of the second chamber 42. The first chamber 41 and the second chamber 42 are connected.

[0072] The first electrical component is installed in the first chamber 41, and the second electrical component is installed in the second chamber 42. The heat generation of the first electrical component is less than that of the second electrical component. The first electrical component is a low-heat-generating component, and the second electrical component is a high-heat-generating component. Air enters the first chamber 41 from the second air inlet 411 to cool the first electrical component. The temperature change of the air is not significant. Then it enters the second chamber 42 and can still cool the second electrical component. The air flows out of the electrical box 40 from the second air outlet 421.

[0073] When the cooling fan 20 is running, a negative pressure environment is formed inside the casing 10, which draws outside air into the casing 10 through the casing air inlet 11. Some of the air inside the casing 10 enters the inverter 30 through the first air inlet 31, and then is discharged to the outside of the casing 10 through the first air outlet 32 ​​and the casing air outlet 12.

[0074] A portion of the air inside the casing 10 enters the first chamber 41 of the electrical box 40 through the second air inlet 411. After passing through the first electrical component, it forms an airflow with a temperature lower than the heat dissipation temperature of the second electrical component. The airflow in the first chamber 41 enters the second chamber 42, cools the second electrical component, and forms a hot airflow. The hot airflow in the second chamber 42 is discharged to the outside of the casing 10 through the second air outlet 421 and the casing air outlet 12.

[0075] By installing a cooling fan 20 on the top of the housing 10, and placing the air outlets of the inverter 30 and the electrical box 40 at the top, the electrical components inside the electrical box 40 are rearranged according to the amount of heat dissipation. The hot airflow is quickly discharged from the top of the housing 10, forming a smooth heat exchange channel, which improves the heat dissipation efficiency and effectively reduces the temperature inside the housing 10.

[0076] In some embodiments, the side plate opposite to the inverter 30 of the housing 10 is a first side plate 13. The housing air inlet 11 is provided below the first side plate 13. At least part of the housing air inlet 11 is at a height lower than the first air inlet 31 and the second air inlet 411, so that the airflow entering the housing from the housing air inlet 11 can enter the bottom of the inverter and the electrical box. The airflow flows upward under the action of the cooling fan 20 at the top, and enters the inverter 30 and the electrical box 40 from the first air inlet 31 and the second air inlet 411 respectively for cooling.

[0077] In some embodiments, a bracket 14 is provided inside the housing 10. The bracket 14 is used to support and fix the electrical box 40 and the inverter 30, such as Figure 6 As shown, the bracket 14 includes multiple horizontal fixing rods 141 and vertical fixing rods 142. The multiple horizontal fixing rods 141 are parallel to each other and coplanar, and their plane is a horizontal plane. The multiple vertical fixing rods 142 are parallel to each other and coplanar, and their plane is perpendicular to the horizontal plane. The vertical fixing rods 142 are fixed in the middle position of the horizontal fixing rods 141, dividing the horizontal fixing rods 141 into front and rear parts.

[0078] The electrical box 40 and the inverter 30 are placed one in front of the other, with the electrical box 40 in front and the inverter 30 behind the electrical box 40. The bottom of the electrical box 40 is fixed to the front half of multiple horizontal fixing rods 141, and its back is fixed to the front side of the vertical fixing rod 142. The bottom of the inverter 30 is fixed to the rear half of multiple horizontal fixing rods 141, and the front of the inverter 30 is fixed to the rear side of the vertical fixing rod 142.

[0079] The horizontal fixing rod can evenly disperse the equipment weight of the inverter 30 and the electrical box 40, and the vertical support rod can provide vertical stability and reduce the risk of deviation of the inverter 30 and the electrical box 40 due to gravity or vibration; the bottom of the inverter 30 and the electrical box 40 is fixed on the horizontal fixing rod 142, and the bottom of the two devices is at the same height, so that the air temperature entering the electrical box 40 is the same as the air temperature entering the inverter after the external air enters the casing 10, thereby reducing the mutual influence of the two devices.

[0080] In some embodiments, the bracket 14 is further provided with a first limiting rod 143 between the front end of the horizontal fixing rod 141 and the vertical fixing rod 142, the first limiting rod 143 is an inclined straight rod, and the first limiting rod is located on both sides of the electrical box 40 to prevent the electrical box from moving left and right due to vibration.

[0081] In some embodiments, the bracket 14 is further provided with a second limiting rod 144 between the rear end of the horizontal fixing rod 141 and the vertical fixing rod 142, the second limiting rod 144 is an inclined straight rod, and the second limiting rod is located on both sides of the inverter 30 to prevent the inverter 30 from moving left and right due to vibration.

[0082] Meanwhile, the first limiting rod 143, the horizontal fixing rod 141 and the vertical fixing rod 142 form a right-angled triangle, and the second limiting rod 144, the horizontal fixing rod 141 and the vertical fixing rod 142 also form a right-angled triangle, thereby improving the structural stability of the bracket 14 and further improving the support stability of the electrical box 40 and the inverter 30.

[0083] In some embodiments, the height of the upper edge of the casing air inlet 11 is lower than the height of the fixing rod 141, so that the air entering from the casing air inlet 11 can enter the first air inlet 31 and the second air inlet 411 as much as possible to cool the inside of the inverter 30 and the electrical box 40.

[0084] In some embodiments, the electrical box 40 includes a shell 43, and the shell 43 is internally provided with a partition plate 44, the partition plate 44 divides the shell 43 into two chambers, i.e., a first chamber 41 located below and a second chamber 42 located above the first chamber 41; the first chamber 41 and the second chamber 42 are separated by the partition plate, so that the hot air in the second chamber 42 cannot flow downward to affect the first electrical components in the first chamber 41.

[0085] As Figure 5As shown, the partition 44 is provided with a ventilation opening 441, which communicates the first chamber 41 and the second chamber 42, and the ventilation opening 441 is respectively arranged at two ends of the body diagonal of the first chamber 41. After the air enters the first chamber 41 from the second air inlet 411, the air flow can be forced to pass through the three-dimensional space of the first chamber 41, so as to realize the maximum heat conduction path, and then enter the second chamber 42 from the ventilation opening 441 at the other end of the body diagonal, so as to effectively cool the first electrical component in the first chamber 41, and form the air flow with a temperature lower than the heat dissipation temperature of the first electrical component.

[0086] In some embodiments, the first electrical component includes a coupling control board, a wiring terminal, an air switch and the like, and the heat dissipation amount thereof is far lower than that of the second electrical component. After the air flow passes through the first electrical component, the temperature thereof will not be obviously increased, and the temperature can also cool the second electrical component, so as to optimize the overall heat dissipation path of the electrical box 40.

[0087] In some embodiments, the second electrical component includes a DC-DC converter 45, which is used to convert the direct-current voltage output by the photovoltaic system into a direct-current voltage suitable for the inverter 30.

[0088] The DC-DC converter 45 is fixed at one end of the partition 44, and the DC-DC converter 45 is arranged close to the second air outlet 421 of the electrical box 40, so as to facilitate the hot air flow from the DC-DC converter 45 to quickly pass through the second air outlet 421 and be discharged.

[0089] In some embodiments, as shown, Figures 7-8 The DC-DC converter 45 is arranged at one end close to the ventilation opening 441, and the DC-DC converter 45 is arranged at the other end away from the ventilation opening 441. The third air outlet 452 is arranged adjacent to the second air outlet 421, so as to shorten the flow path of the hot air flow in the casing and improve the heat dissipation efficiency.

[0090] The air flow in the first chamber 41 enters the second chamber 42 through the ventilation opening 441, and then forms a hot air flow after being cooled by the internal equipment of the DC-DC converter 45 through the third air inlet 451. The hot air flow is discharged from the third air outlet 452 of the DC-DC converter 45, and under the strong suction of the top heat dissipation fan 20, the hot air flow is quickly discharged through the second air outlet 421 and the casing air outlet 12, so as to shorten the flow distance of the hot air flow and further improve the heat dissipation efficiency.

[0091] In some embodiments, the second air inlet 411 and the air vent 441 are located at the body diagonal ends of the first chamber 41, the third air outlet 451 and the second air outlet 421 are arranged on the same side of the air vent 441, the second air inlet 411, the first chamber, the air vent 441, the second chamber, the third air outlet 451, and the second air outlet 421 form a heat dissipation air path of the electrical appliance box 40, the first chamber is located at the front end of the heat dissipation air path, the airflow temperature rises not high, the DC-DC converter 45 with high heat is located at the end of the heat dissipation air path, the airflow forms a hot airflow after passing through the DC-DC converter 45, and the hot airflow is quickly discharged from the second chamber 42, the heat dissipation air path is smooth, there is no hot air accumulation phenomenon, and the heat dissipation efficiency is high.

[0092] In some embodiments, as shown in Figure 9 , the DC-DC converter 45 is provided with a wind guide 46, the wind guide 46 forms a wind guide channel 461, the wind guide 46 is arranged close to the third air outlet 452, and the wind guide 46 guides the hot airflow flowing out of the third air outlet 452 to the second air outlet 421 through the wind guide channel 461.

[0093] In some embodiments, the wind guide 46 is a long rectangular structure with two open ends formed by bending a plate, a part of the structure of the wind guide is sleeved on the outer circumferential side of the DC-DC converter 45 close to the third air outlet 452, and another part of the structure is located between the third air outlet 452 and the second air outlet 421, the wind guide 46 located between the third air outlet 452 and the second air outlet 421 forms the wind guide channel 461, so that the hot airflow flowing out of the third air outlet 452 flows along the wind guide channel to the second air outlet 421.

[0094] In some embodiments, a wind blocking part 462 is arranged between the wind guide 46 and the shell 43, the wind blocking part is used for blocking the gap between the outer circumferential side of the DC-DC converter 45 and the shell 43, preventing the hot air flowing out of the third air outlet 452 from flowing back to the air vent 441, and affecting the heat dissipation effect of the first electrical component in the first chamber 41.

[0095] In some embodiments, the wind blocking part 462 is arranged at both ends of the wind guide 46, four wind blocking parts 462 are arranged at each end, the gaps between the wind guide 46 and the upper shell 43, the wind guide 46 and the partition plate 44, the wind guide 46 and the front shell, and the wind guide and the rear shell are blocked, the hot airflow is prevented from flowing back to the air vent 441 from the above-mentioned gaps or gathering at the third air outlet 421, and the heat dissipation effect of the DC-DC converter 45 is affected, if the heat dissipation effect of the DC-DC converter 45 is not good, heat is transferred to the first chamber 41 through the partition plate 44, and the first electrical component is affected.

[0096] In some embodiments, the wind blocking part 462 is bent outwards from each of the four edges of the air guide 46, and the air blocking cotton is arranged between the wind blocking parts 462 at the two ends of the air guide 46, further preventing the backflow of hot air. When the hot air flows through the air guide channel 461, it will inevitably exchange heat with the air guide 46, causing the temperature of the air guide 46 to rise. The arrangement of the air blocking cotton can prevent the heat of the air guide 46 from being transferred from the shell of the DC-DC converter 45 to the third air inlet 451, affecting the heat dissipation effect of the DC-DC converter.

[0097] In some embodiments, a water blocking strip 431 is arranged below the second air outlet 421 on the outer side of the shell 43. The water blocking strip 431 is used to block the water vapor in the air flowing upwards along the shell, preventing the water vapor from condensing into water and entering the second air outlet 421 along the outer wall of the shell, then entering the second chamber 42, and affecting the service life of the DC-DC converter 45. Because the power of the top heat dissipation fan 20 is large enough, a large amount of external air will be sucked into the air inlet 11 of the shell. When the water vapor in the external air is sufficient, water flow will be easily generated. If the water flow enters the DC-DC converter along the shell 43, it will affect the performance of the DC-DC conversion and reduce the service life.

[0098] In some embodiments, as shown in Figure 10 The front side of the shell 43 is provided with an opening part 432, which is arranged away from the air inlet 11 of the shell. The opening part 432 is provided with a door body 433, which is a double-leaf door and is rotatably connected to the opening part 432. The door body 433 is used to open and close the opening part 432, and a handle is arranged on the door body to facilitate the opening and closing of the door body 433, and facilitate the subsequent maintenance of the internal equipment of the electric appliance box.

[0099] In some embodiments, an inverter 30 is further arranged in the shell. The inverter 30 is provided with a first heat dissipation chamber 33 on one side close to the electric appliance box 40. A first heat dissipation fan is arranged in the first heat dissipation chamber 33, which is used to dissipate heat and cool the inside of the inverter.

[0100] The first air inlet 31 is located at the bottom of the first heat dissipation chamber 33, and the first air outlet 32 is located at the top of the first heat dissipation chamber 33. Through the operation of the first heat dissipation fan, part of the air entering the air inlet 11 of the shell passes through the first air inlet 31 into the first heat dissipation chamber 33, and then flows upwards as hot air. After the hot air flows out of the first heat dissipation chamber 33 through the first air outlet 32 at the top, the hot air is discharged to the outside of the shell 10 under the action of the top heat dissipation fan 20, as shown in Figure 11

[0101] ​The first air inlet 31, the first heat dissipation cavity 33, and the first air outlet 32 form a heat dissipation channel of the inverter 30. The heat dissipation channel is a vertical channel, which is consistent with the characteristic of hot air rising. Meanwhile, the strong suction of the top heat dissipation fan 20 can also make the hot air smoothly and quickly discharged from the first air outlet 32, without gathering in the first heat dissipation cavity 33, thereby improving the heat dissipation efficiency of the inverter 30 and realizing efficient heat dissipation.

[0102] In some embodiments, the electrical cavity 34 of the inverter 30 is arranged behind the first heat dissipation cavity 33. The electrical cavity 34 is a sealed cavity, which internally contains sensitive electronic elements such as control circuits, filters, sensors, etc., which need to be in a completely sealed state to prevent external dust, moisture, and corrosive gases from invading to cause circuit short circuit, oxidation, or signal interference. The electrical cavity needs to reach an IP65 or above protection level, which is isolated from solid foreign matter and liquid invasion by means of sealing glue, mechanical sealing, etc.

[0103] The first heat dissipation cavity 33 and the electrical cavity 34 have clear division of labor. The heat dissipation airflow is discharged through the independent first heat dissipation cavity 33, and the first heat dissipation cavity 33 is not communicated with the electrical cavity, so as to avoid the heat dissipation airflow carrying pollutants such as water vapor or dust into the electrical cavity 34.

[0104] In some embodiments, as shown in Figures 12-14 , a water blocking assembly 47 is arranged in the shell 43, and the water blocking assembly 47 is arranged at the second air inlet 411 to block liquid water, water vapor, and dust entering from the second air inlet 411;

[0105] The physical protection mechanism balances the needs of waterproofing and ventilation, avoids the entry of external liquid water, water vapor, and dust into the inside of the electrical box 40, avoids the internal circuit from being damp or short-circuited, and prolongs the service life of the internal equipment of the electrical box.

[0106] In some embodiments, as shown in Figure 13 , the water blocking assembly 47 is a double-layer waterproof cover plate structure, which includes a first water blocking part 471 and a second water blocking part 472. The first water blocking part 471 allows airflow to flow only to the rear, and the second water blocking part 472 allows airflow to flow only to the front. Part of the structure of the second water blocking part 472 is located in the first water blocking part 471, and the first water blocking part 471 and the second water blocking part 472 form a semi-closed cover body.

[0107] After the airflow enters from the second air inlet 411, it first contacts the second water blocking part 472, which blocks most of the liquid water. Even if a small amount of water droplets break through the second water blocking part 472, they will still be blocked by the first water blocking part 471, significantly reducing the risk of liquid water backflow. The airflow flows to the rear to cool the first cavity 411.

[0108] In some embodiments, as shown in Figure 14As shown, the first water blocking member 471 includes a first horizontal water blocking plate 4711 and three first vertical water blocking plates 4712, which are respectively used to block the air flow from spreading to the front and the left and right sides. The first horizontal water blocking plate 4711 is located at the top of the three first vertical water blocking plates 4712 and blocks the air flow from spreading upwards at the rear of the upper blocking part of the second air inlet 411. The first water blocking member 471 allows the air flow to only flow to the rear.

[0109] The second water blocking member 472 includes a second horizontal water blocking plate 4721 and three second vertical water blocking plates 4722, which are respectively used to block the air flow from spreading to the rear and the left and right sides. The second horizontal water blocking plate 4721 is located at the top of the three second vertical water blocking plates 4722 and blocks the air flow from spreading upwards at the front of the upper blocking part of the second air inlet 411. The second water blocking member 472 allows the air flow to only flow to the front.

[0110] After the air flow enters the second air inlet 411, it first contacts the second water blocking member 472, which blocks most of the liquid water. The water vapor and dust also adhere to the second horizontal water blocking plate 4721 and the three second vertical water blocking plates 4722. A small amount of water droplets, water vapor, and dust that break through the second water blocking member 472 are still blocked by the first horizontal water blocking plate 4711 and the three first vertical water blocking plates 4712 of the first water blocking member 471, significantly reducing the risk of liquid water backflow. At the same time, the water vapor and dust adhering to the inner walls of the first water blocking member 471 and the second water blocking member 472 will also fall under the action of gravity after a certain period of accumulation.

[0111] In some embodiments, the machine shell air inlet 11 is arranged as an array of ventilation holes or a louver structure, which can ensure smooth air intake and prevent rodents and other rodents from invading, thereby improving the synergistic ability of heat dissipation and protection of the machine shell.

[0112] Since the suction of the top heat dissipation fan 20 is large enough, the air flow entering from the array of ventilation holes can also flow upwards into the electrical box 40 and the inverter 30 for cooling.

[0113] In some embodiments, a dust cover 50 is arranged below the heat dissipation fan 20, and the dust cover 50 is located above the inverter 30 and the electrical box 40. The dust cover 50 is uniformly distributed with ventilation holes 51. The dust cover 51 prevents dust from entering the inverter 30 or the electrical box 40, thereby avoiding uneven heat dissipation or damage to electronic components caused by dust accumulation.

[0114] In some embodiments, as shown in FIG. 6, the dust cover 50 is arranged on the top of the heat dissipation fan 20, and the dust cover 50 is located above the inverter 30 and the electrical box 40. Figure 15As shown, the dust cover 50 includes a top plate 52 located above the electrical box 40, the top plate 52 includes two parts, the part of the top plate 52 located above the electrical box 40 is a horizontal plate 521, and the part of the top plate 52 located above the inverter 30 is an inclined plate 521, the inclined direction of the inclined plate 521 is downwardly inclined from the top of the electrical box 40 to the top of the inverter 30;

[0115] The second air outlet 421 of the electrical box 40 is located on one side of the electrical box 40, and the top of the electrical box 40 is not provided with an air outlet, so that the horizontal plate of the top plate is not provided with a ventilation hole 51, and is a closed plate, which has good dustproof effect;

[0116] The first air outlet 32 of the inverter 30 is located on the top of the inverter 30, the heat dissipation airflow for cooling the inverter 30 flows out from the top of the inverter 30, the ventilation holes 51 are uniformly distributed on the inclined plate 521, and the inverter 30 is effectively dustproofed without affecting the heat dissipation effect of the inverter 30;

[0117] In some embodiments, the dust cover 50 is also provided with two side plates 53, the side plates 53 are located on both side edges of the top plate 521 and the inclined plate 522, the side plates 53 are in a right trapezoidal structure, and the ventilation holes 51 are uniformly distributed on the side plates 53, so that the hot air in the electrical box 40 can flow out from the second air outlet 421 on the side, and then rapidly flow out upwardly through the ventilation holes 51 of the side plates 53 under the strong suction of the heat dissipation fan 20.

[0118] In some embodiments, the lower edges of the side plates 53 of the dust cover 50 are fixed on the top ends of the vertical support rods 142 of the support 14 through bolts, so that the dust cover is convenient to install and disassemble.

[0119] In some embodiments, as shown, Figure 16 As shown, the shell 10 is provided with a detachable access panel 15, the access panel 15 is used for opening or closing the shell 10, the access panel 15 is arranged opposite to the air inlet 11 of the shell and adjacent to the door body 433 of the electrical box 40, and the door body 433 of the electrical box 40 can be seen by opening the access panel 15, so that the electrical box 40 is convenient to overhaul.

[0120] In some embodiments, the access panel 15 includes a first access panel 151, a second access panel 152 and a third access panel 153 which can be separately disassembled, the first access panel 151 is located on the left side and has a height consistent with the height of the shell 10, the second access panel 152 and the third access panel 153 are located on the right side of the first access panel 151 and arranged in an up-down manner, the second access panel 152 is above, the third access panel 153 is below, and the width of the first access panel 151 is less than the width of the second access panel 152;

[0121] The maintenance plate 15 is divided into three independent parts, which can quickly locate the problem area, and only needs to remove the corresponding maintenance plate of the area to view, without the need to remove the whole structure, avoiding affecting other areas and reducing the risk of chain reaction.

[0122] In some embodiments, the bottom of the casing 10 is also provided with a waterproof support seat 60, which lifts the bottom of the casing 10 to form a height difference with the ground, effectively blocking the direct contact of the casing bottom with surface accumulated water and rainwater.

[0123] In the above-mentioned photovoltaic coupling box, for the inverter, the casing air inlet 11, the first air inlet 31, the first heat dissipation cavity 33, the first air outlet 32, the casing air outlet 12 form a heat dissipation channel of the inverter 30, and the heat dissipation channel of the inverter 30 is smooth and unobstructed in the vertical direction. Due to the strong suction of the top heat dissipation fan, the air flow flowing out of the first heat dissipation cavity 33 can be quickly discharged to the outside of the casing, improving the heat dissipation efficiency of the inverter 30.

[0124] For the electrical appliance box, the casing air inlet 11, the second air inlet 411, the first chamber 41, the air vent 441, the third air inlet 451 of the DC-DC converter 45, the third air outlet 452 of the DC-DC converter 45, the air guide piece 46, the second air outlet 421, and the casing air outlet 12 form a heat dissipation channel of the electrical appliance box 40.

[0125] The electrical appliance box 40 includes a first chamber 41 and a second chamber 42, the first chamber 41 is provided with a first electrical component with a first heat dissipation amount, and the second chamber 42 is provided with a DC-DC converter 45 with a high heat dissipation amount, the heat dissipation amount of the first electrical component is less than that of the DC-DC converter 45, the first chamber 41 is located in front of the heat dissipation channel of the electrical appliance box, and the second chamber 42 is located behind the heat dissipation channel of the electrical appliance box. Air enters the first chamber 41 through the second air inlet 411 to form an air flow with a temperature lower than the heat dissipation temperature of the DC-DC converter 45, and then enters the second chamber 42 to form a hot air flow after passing through the DC-DC converter 45. The hot air flow is guided to the second air outlet 421 through the air guide piece 46 and the third air outlet 452, and the hot air flow flows out through the casing air outlet 12.

[0126] According to the size of the heat dissipation amount, the electrical components in the electrical appliance box 40 are rearranged, the low-heat-dissipation components are in front of the heat dissipation channel of the electrical appliance box, and the high-heat-dissipation components are behind the heat dissipation channel. The finally formed hot air flow is quickly discharged at the top of the casing, a smooth heat exchange channel is formed in the electrical appliance box 40, the heat dissipation efficiency is improved, and the temperature in the casing is effectively reduced.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0128] The foregoing description has been presented for the purpose of illustration and description. It is not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. Modifications and variations are possible in light of the above teachings or can be acquired from practice of the embodiments. The described embodiments were chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best use the application in various embodiments and with various modifications as are suited to the particular use contemplated.

Claims

1. A photovoltaic coupling box, characterized in that, include: The housing includes a housing air inlet and a housing air outlet, wherein the housing air inlet is located at the bottom of the housing and the housing air outlet is located at the top of the housing. A cooling fan is disposed inside the housing, and the cooling fan is located near the air outlet of the housing; An electrical box, disposed inside the housing, comprises: The housing has an internal partition that divides the interior of the housing into two chambers, the lower chamber being the first chamber and the upper chamber being the second chamber. A first electrical component is disposed within the first cavity; A DC-DC converter is disposed in the second chamber. The DC-DC converter is used to convert the DC voltage output by the photovoltaic system into a DC voltage suitable for the inverter. The heat generation of the DC-DC converter is greater than that of the first electrical component. The second air inlet is located at the bottom of the first chamber; The second air outlet is located on one side of the second chamber; A ventilation opening is provided on the partition plate, the ventilation opening connects the first chamber and the second chamber, and the ventilation opening and the second air inlet are respectively located at opposite ends of the body diagonal of the first chamber; The third air inlet is located at one end of the DC-DC converter near the vent. The third air outlet is located at the end of the DC-DC converter near the second air outlet; As the cooling fan operates, a negative pressure environment is created inside the casing, drawing outside air in through the casing air inlet. The air inside the casing then enters the first chamber through the second air inlet. The airflow is forced to penetrate the three-dimensional space of the first chamber, cooling the first electrical component and forming an airflow with a temperature lower than the heat dissipation temperature of the second electrical component. The airflow then enters the second chamber through the vent, passes through the third air inlet, and enters the DC-DC converter. After cooling the inside of the DC-DC converter, the airflow forms a hot airflow, which flows out through the third air outlet. Under the action of the top cooling fan, the hot airflow is rapidly discharged to the outside of the casing through the second air outlet and the casing air outlet.

2. The photovoltaic coupling box according to claim 1, characterized in that, An air guide is provided between the DC-DC converter and the housing, forming an air guide channel. The air guide is located near the third air outlet, and the air guide leads the hot air flowing from the third air outlet to the second air outlet through the air guide channel.

3. The photovoltaic coupling box according to claim 2, characterized in that, The air guide is provided with a windproof part, which is used to block the gap between the outer periphery of the DC-DC converter and the housing.

4. The photovoltaic coupling box according to claim 1, characterized in that, A water baffle is provided below the second air outlet, which is used to block water vapor in the air flowing upward along the housing.

5. The photovoltaic coupling box according to claim 1, characterized in that, An opening is provided on the front side of the housing, the opening being located away from the air inlet of the housing, and a door is provided on the opening. The door is rotatably connected to the opening of the housing and is used to open and close the opening.

6. The photovoltaic coupling box according to claim 1, characterized in that, A water-blocking component is provided inside the housing. The water-blocking component is located at the second air inlet and is used to block water vapor from entering from the second air inlet.

7. The photovoltaic coupling box according to claim 1, characterized in that, At least part of the housing air inlet is located at a height lower than the second air inlet, so that the airflow entering the housing from the housing air inlet is located at the bottom of the housing. When the airflow flows upward under the action of the cooling fan at the top, it enters the housing from the second air inlet and cools the first electrical component and the DC-DC converter in sequence.

8. The photovoltaic coupling box according to claim 1, characterized in that, The air inlet of the casing is an array of ventilation holes or a louver structure.

9. The photovoltaic coupling box according to claim 1, characterized in that, The housing is provided with a detachable inspection plate, which is positioned opposite to the air inlet of the housing. The inspection plate is used to open or close the housing.

10. A photovoltaic coupling box, characterized in that, include: The housing includes a housing air inlet and a housing air outlet, wherein the housing air inlet is located at the bottom of the housing and the housing air outlet is located at the top of the housing. A cooling fan is disposed inside the housing, and the cooling fan is located near the air outlet of the housing; An electrical box is disposed inside the housing. A second air outlet is provided at the bottom of the electrical box and a second air outlet is provided at the top of the electrical box. The electrical box includes: A housing, wherein a partition is provided inside the housing, the partition separating the first chamber and the second chamber inside the housing; A first electrical component is disposed within the first cavity; A DC-DC converter is disposed in the second chamber. The DC-DC converter is used to convert the DC voltage output by the photovoltaic system into a DC voltage suitable for the inverter. The heat generation of the DC-DC converter is greater than that of the first electrical component. The air inlet of the casing, the second air inlet, the first cavity, the second cavity, the second air outlet, and the air outlet of the casing form a heat dissipation channel for the electrical box; The first chamber is located in front of the heat dissipation channel of the electrical box, and the second chamber is located behind the heat dissipation channel of the electrical box. Air first enters the first chamber through the second air inlet, forming an airflow with a temperature lower than the heat dissipation temperature of the second electrical component, and then enters the second chamber, forming a hot airflow after passing through the DC-DC converter.

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