Air-cooled radiator and photovoltaic inverter

Abstract

The utility model discloses an air-cooled radiator and a photovoltaic inverter, and relates to the technical field of thermal design. The air cooling radiator comprises a cold air source, a main air duct shell and an outer air duct plate, a main air duct is arranged in the main air duct shell in a penetrating mode, airflow in the main air duct is used for cooling a heating device, the outer air duct plate is externally arranged and connected to the main air duct shell, a flow dividing air duct is formed between the outer air duct plate and the main air duct shell, and the tail end of the flow dividing air duct is sealed through a sealing plate. An air inducing hole is formed in the main air duct shell and is communicated with the shunting air duct and the main air duct; the cold air source can provide airflow for the main air duct and the flow dividing air ducts respectively. According to the air-cooled radiator, the shunting air channel is additionally arranged in the air-cooled radiator, cold air in the shunting air channel can enter the main air channel through the air inducing hole so as to cool air flow heated by the heating device in the area near the air inducing hole in the main air channel, and the temperature difference between the air flow in the area in the main air channel and the heating device is increased; the overall cooling capacity of air flow in the main air duct in the whole main air duct can be improved, and the cooling effect of a heating device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal design, in particular to an air-cooled radiator and a photovoltaic inverter. Background Art

[0002] In current air-cooled photovoltaic inverters and other equipment, the heating device is arranged outside the air duct shell, and an air duct is arranged in the air duct shell, so that the heat released by the heating device into the air duct is taken away by the cold air in the air duct. In the air flow direction of the air duct, the heating device has multiple heating elements, and in the air duct, as the heating device is continuously cooled, the air flow continues to heat up during the flow in the air duct, and the closer the heating element in the heating device is to the end of the air duct, the worse the heat dissipation effect.

[0003] Therefore, how to improve the cooling effect of the heating device is a technical problem that technicians in this field currently need to solve. Utility Model Content

[0004] In view of this, an object of the present invention is to provide an air-cooled radiator and a photovoltaic inverter, which can improve the cooling effect of heating components.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A wind-cooled radiator comprises a cold air source, a main air duct shell and an outer air duct plate, wherein a main air duct is arranged through the main air duct shell, and the air flow in the main air duct is used to cool a heating device, the outer air duct plate is externally arranged and connected to the main air duct shell, and a bypass air duct is formed between the outer air duct plate and the main air duct shell, and the end of the bypass air duct is sealed by a sealing plate; an air ducting hole is arranged on the main air duct shell, and the air ducting hole connects the bypass air duct with the main air duct; the cold air source can provide air flow to the main air duct and the bypass air duct respectively.

[0007] Preferably, the air induction holes include terminal air induction holes; in the airflow direction in the diversion air duct, the terminal end of the terminal air induction hole is butted against the sealing plate.

[0008] Preferably, the sealing plate is arranged to be inclined relative to the airflow direction in the diverter air duct, and along the airflow direction in the diverter air duct, the sealing plate gradually deviates toward the main air duct shell.

[0009] Preferably, the air induction holes include middle air induction holes; in the direction of airflow in the diversion air duct, the middle air induction holes are connected to the middle of the diversion air duct.

[0010] Preferably, the diversion air duct also includes an air guide plate corresponding to the central air inlet hole; a gap is provided between the end of the air guide plate away from the main air duct and the outer air duct plate for air flow to pass through; the air guide plate is connected to the main air duct shell, and the connection point is located at the end of the corresponding central air inlet hole in the air flow direction of the diversion air duct; the air guide plate is inclined relative to the air flow direction in the diversion air duct, and along the air flow direction in the diversion air duct, the air guide plate gradually deviates toward the main air duct shell.

[0011] Preferably, the plurality of middle air inlet holes and the air guide plates respectively corresponding to the middle air inlet holes are arranged in sequence along the air flow direction of the diversion air duct, and in the air flow direction of the diversion air duct, the distance between the end of each air guide plate away from the main air duct and the outer air duct plate gradually decreases.

[0012] Preferably, the airflow direction in the main air duct is the same as the airflow direction in the branch air duct.

[0013] Preferably, it also includes a heating device externally arranged in the main air duct, the heating device and the external air duct plate are respectively arranged on two opposite sides outside the main air duct shell, and the heating device includes a plurality of heating bodies arranged in sequence along the air flow direction of the main air duct.

[0014] Preferably, a heat dissipation hole is provided on the main air duct shell, a radiator substrate and radiator fins fixed to the radiator substrate are arranged in the main air duct shell, the radiator substrate is attached to the inner wall of the main air duct shell and covers the heat dissipation hole, the heating device contacts the radiator substrate through the heat dissipation hole, and the heating device can dissipate heat into the main air duct through the radiator substrate.

[0015] A photovoltaic inverter comprises a box body, wherein a accommodating cavity and a cooling cavity are separated by a partition inside the box body, the accommodating cavity is used to install a heating device, and the cooling cavity is provided with an air-cooled radiator as described above; an air inlet and an air outlet are provided on the part of the box body located outside the cooling cavity, and a first air duct plate and a second air duct plate are sequentially arranged in the cooling cavity along a direction close to the partition, the first air duct plate is fitted and fixed to the box body, the second air duct plate, the partition and the part of the box body located between the second air duct plate and the partition are connected to form the main air duct shell, and the first air duct plate and the part of the box body located between the first air duct plate and the second air duct plate are connected to form the outer air duct plate.

[0016] The utility model provides an air-cooled radiator, comprising a cold air source, a main air duct shell and an outer air duct plate. The main air duct shell is provided with a main air duct running through it, and the air flow in the main air duct is used to cool the heating device. The outer air duct plate is externally arranged and connected to the main air duct shell, and a branch air duct is formed between the outer air duct plate and the main air duct shell, and the end of the branch air duct is sealed by a sealing plate. The main air duct shell is provided with air duct holes, which connect the branch air duct and the main air duct. The cold air source can provide air flow to the main air duct and the branch air duct respectively.

[0017] The transfer of heat requires a temperature difference, and is carried out from a high-temperature object to a low-temperature object. In general, the greater the temperature difference, the more conducive it is to heat transfer, and the smaller the temperature difference, the less conducive it is to heat transfer. A diverter duct is added to the air-cooled radiator, and the cooling airflow of the cold air source is provided to the main duct and the diverter duct respectively. Since the end of the diverter duct is sealed by a sealing plate, the cold air in the diverter duct can enter the main duct through the air duct hole to cool the airflow in the main duct near the air duct hole that is heated by the heating device, thereby increasing the temperature difference between the airflow in this area of ​​the main duct and the heating device, which can improve the overall cooling capacity of the airflow in the main duct in the entire main duct and improve the cooling effect of the heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 A cross-sectional view of a specific embodiment 1 of an air-cooled heat sink applied to a photovoltaic inverter provided by the utility model;

[0020] Figure 2 It is a cross-sectional view of a specific embodiment 2 of the air-cooled heat sink applied to a photovoltaic inverter provided by the utility model;

[0021] Figure 3 for Figure 2 AA cross-section diagram;

[0022] Figure 4 It is a cross-sectional view of a third specific embodiment of the air-cooled heat sink provided by the utility model and applied to a photovoltaic inverter.

[0023] Reference numerals:

[0024] 1-box, 101-accommodating chamber, 102-cooling chamber, 1021-air inlet, 1022-air outlet;

[0025] 2-main air duct shell, 201-main air duct, 202-second air duct plate;

[0026] 3-partition, 301-heat dissipation hole;

[0027] 4- Circuit board;

[0028] 5-heating device, 501-heating element No. 1, 502-heating element No. 2, 503-heating element No. 3, 504-heating element No. 4;

[0029] 6- Power devices;

[0030] 7-cold air source, 701-main airflow, 702-interlayer airflow, 7021-first induced airflow, 7022-second induced airflow;

[0031] 8-external air duct plate, 801-first air duct plate, 802-air guide plate, 803-sealing plate, 804-dividing air duct, 805-middle air induction hole, 806-end air induction hole, 807-air induction hole;

[0032] 9- radiator base plate, 901- radiator fins. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The core of the utility model is to provide an air-cooled radiator and a photovoltaic inverter, which can improve the cooling effect of heating components.

[0035] The air-cooled radiator provided by the utility model is as follows: Figures 1 to 4 The illustrated embodiment can be applied to the photovoltaic industry, and the air-cooled radiator can specifically be an air-cooled radiator in a photovoltaic inverter. Of course, it can also be applied to other fields or equipment. For example, the air-cooled radiator can also be used as an air-cooled radiator for a server.

[0036] like Figure 1As shown, in a specific embodiment 1, the air-cooled radiator specifically includes a cold air source 7, a main air duct shell 2 and an outer air duct plate 8. A main air duct 201 is provided through the main air duct shell 2, and the air flow in the main air duct 201 is used to cool the heating device 5. The outer air duct plate 8 is externally arranged and connected to the main air duct shell 2, and a shunt air duct 804 is formed between the outer air duct plate 8 and the main air duct shell 2, and the end of the shunt air duct 804 is sealed by a sealing plate 803. An air induction hole 807 is provided on the main air duct shell 2, and the air induction hole 807 connects the shunt air duct 804 with the main air duct 201. The cold air source 7 can provide airflow to the main air duct 201 and the shunt air duct 804 respectively, and the cold air source 7 is specifically a fan. Optionally, the heating device 5 and the outer air duct plate 8 have a certain interval and are not in direct contact, ensuring that the airflow in the shunt air duct 804 is not used to directly cool the heating device 5, and a relatively low temperature can be maintained.

[0037] Specifically, the airflow direction in the main air duct 201 is the same as the airflow direction in the branch air duct 804. Figure 1 As shown, these two directions are parallel straight line directions, and in other embodiments, they may also be arc directions. In other embodiments, the flow direction of the local airflow in the main air duct 201 and the flow direction of the local airflow in the branch air duct 804 may also have an angle. It should be noted that the flow direction of the airflow is its forward direction, that is, the airflow flows forward from the rear along the corresponding flow direction.

[0038] Specifically, the cross-section of the diversion air duct 804 perpendicular to the direction of the air flow therein can be smaller than the cross-section of the main air duct 201 perpendicular to the direction of the air flow therein, so that most of the airflow from the cold air source 7 enters the main air duct 201 to play a major cooling role, and a small part enters the diversion air duct 804 to play an auxiliary role.

[0039] Since the airflow in the main air duct 201 keeps flowing in the main air duct 201 and keeps absorbing the heat from the heating element 5, the temperature of the airflow in the main air duct 201 keeps increasing along the airflow direction in the main air duct 201. However, the split air duct 804 does not participate in the heat exchange with the heating element 5, so the temperature of the airflow in the split air duct 804 is always low.

[0040] By mixing the airflow in the low-temperature shunt air duct 804 with the airflow in the high-temperature main air duct 201 through the air induction holes 807, the heat accumulation effect of the airflow in the main air duct 201 along its flow direction can be weakened, so as to achieve the purpose of reducing the airflow temperature at the rear position in the main air duct 201. Considering that the transfer of heat requires a sufficient temperature difference, the greater the temperature difference between two objects, the more conducive to heat transfer, and the smaller the temperature difference, the less conducive to heat transfer. By adding the shunt air duct 804 and the air induction holes 807, the overall cooling capacity of the airflow in the main air duct 201 in the entire main air duct 201 can be improved, and the cooling effect of the heat-generating device 5 can be improved.

[0041] Regarding the arrangement of the air inlet 807, Figure 1 As shown, the air inlet 807 includes a terminal air inlet 806. In the airflow direction of the split air duct 804, the terminal end of the terminal air inlet 806 is connected to the sealing plate 803. Figure 1 In the right direction, the end of the terminal air inlet 806 in this direction corresponds to Figure 1 The right end of the middle terminal air inlet 806 may be a straight or curved edge or an end point, depending on the shape of the terminal air inlet 806, which is connected to the sealing plate 803. In the split air duct 804, after the airflow flows to the sealing plate 803, it can all flow into the main air duct 201 through the terminal air inlet 806. Compared with the embodiment in which the terminal air inlet 807 in this direction is staggered with the sealing plate 803, the utilization efficiency of the airflow in the split air duct 804 can be improved.

[0042] Among them, Figure 1 As shown, the sealing plate 803 is inclined relative to the air flow direction in the diversion air duct 804, and along the air flow direction in the diversion air duct 804, the sealing plate 803 gradually leans toward the main air duct shell 2. Compared with the sealing plate 803 being perpendicular to the air flow direction in the diversion air duct 804, this inclined setting has a better drainage effect.

[0043] The number and position of the air inlet holes 807 can be set according to actual needs. Figure 1 , with only one terminal air inlet 806. However, in other embodiments, the number of air inlet 807 can be multiple, and the position can also be set in other ways, for details, refer to Figure 2 and Figure 3 The second embodiment shown and Figure 4 In the third embodiment shown, the air inlet holes 807 include, in addition to the terminal air inlet holes 806, a middle air inlet hole 805. Specifically, in the direction of air flow in the diversion air duct 804, the middle air inlet hole 805 is connected to the middle of the diversion air duct 804 to improve the cooling capacity of the air flow near the middle air inlet hole 805 in the main air duct 201.

[0044] Specifically, Figure 2 As shown, the split air duct 804 also includes an air guide plate 802 corresponding to the middle air induction hole 805. There is a gap between the end of the air guide plate 802 away from the main air duct 201 and the outer air duct plate 8 for air flow to pass through, wherein the size of the gap can be set as needed, for example, in the direction perpendicular to the air flow of the split air duct 804, the size of the gap occupies half of the distance between the specific position of the corresponding middle air induction hole 805 and the air guide plate 802, refer to Figure 2 The height of the split air duct 804 in the up and down directions of the illustrated viewing angle is the same at all locations, and the height of the air guide plate 802 is approximately half of the height of the sealing plate 803.

[0045] At the same time, the air guide plate 802 is connected to the air duct shell 2, and the connection point is located at the end of the corresponding middle air induction hole 805 in the air flow direction of the split air duct 804. The air guide plate 802 is inclined relative to the air flow direction in the split air duct 804, and along the air flow direction in the split air duct 804, the air guide plate 802 gradually deviates toward the main air duct shell 2.

[0046] By adding the air guide plate 802 , the airflow in the split air duct 804 can be prevented from directly bypassing the middle air inlet hole 805 and flowing forward, and at least part of the airflow can be blocked to flow into the corresponding middle air inlet hole 805 .

[0047] In addition, Figure 2 and Figure 3 In the second embodiment shown, only one central air inlet hole 805 is provided. Figure 4 In the embodiment shown, a plurality of middle air inlet holes 805 are provided. Figure 4 In the illustrated embodiment, in order to ensure that each central air inlet hole 805 can direct air to the main air duct 201, a plurality of central air inlet holes 805 and air guide plates 802 corresponding to each central air inlet hole 805 are arranged in sequence along the air flow direction of the diversion air duct 804, and in the air flow direction of the diversion air duct 804, the distance between the end of each air guide plate 802 away from the main air duct 201 and the outer air duct plate 8 gradually decreases. Usually, the distance between the end of the air guide plate 802 away from the main air duct 201 and the outer air duct plate 8 refers to the distance in a direction perpendicular to the air flow direction of the diversion air duct 804.

[0048] Regarding the arrangement of the heating element 5, Figure 1 As shown, the air-cooled radiator further includes a heating device 5 externally disposed in the main air duct 201, the heating device 5 and the outer air duct plate 8 are respectively disposed on two opposite sides of the main air duct shell 2, and the heating device 5 includes a plurality of heating elements sequentially arranged along the air flow direction of the main air duct 201, such as Figure 1 The first heating element 501, the second heating element 502, the third heating element 503 and the fourth heating element 504 are arranged in this way, so that the air flow temperature at the starting position and the vicinity of the split air duct 804 can be prevented from being affected by the heating element 5, and the low temperature of the air flow in the split air duct 804 can be guaranteed as much as possible.

[0049] Among them, the position of the air vent 807 can be adaptively set in combination with the position of the heating element. For example, in the direction perpendicular to the airflow direction in the main air duct 201, each heating element located in the middle and rear part, such as the No. 3 heating element 503 and the No. 4 heating element 504, can be respectively provided with an air vent 807. Alternatively, when the airflow in the main air duct 201 is difficult to meet the cooling effect required by a certain heating element, an air vent 807 is set at or near the corresponding position in the direction perpendicular to the airflow direction in the main air duct 201.

[0050] In a specific arrangement of the air inlet 807, assuming that among the four heating elements, the heating power of the third heating element 503 is much higher than that of the other heating elements, only one air inlet 807 can be opened, wherein the air flows forward. Figure 1 In the middle position, the left side of the split air duct 804 and the main air duct 201 is the rear side, and the right side is the front side, and the cold airflow in the split air duct 804 with low temperature is completely introduced to the rear of the third heating element 503 (that is, Figure 1 The gap between the radiator fins 901 on the left side of the third heating element 503 in the middle is mixed with the high-temperature airflow in the main air duct 201 at this position to reduce the airflow in the main air duct 201 to the rear of the third heating element 503 (i.e., Figure 1 The temperature of the airflow on the left side of the No. 3 heating element 503 is reduced, and the airflow with reduced temperature flows forward through the No. 3 heating element 503, thereby finally achieving the effect of improving the temperature of the No. 3 heating element 503 itself.

[0051] To further improve the heat dissipation effect, Figure 1 As shown, a heat dissipation hole 301 is opened on the main air duct shell 2, a radiator substrate 9 and a radiator fin 901 fixed to the radiator substrate 9 are arranged in the main air duct shell 2, the radiator substrate 9 is attached to the inner wall of the main air duct shell 2 and covers the heat dissipation hole 301, the heating device 5 contacts the radiator substrate 9 through the heat dissipation hole 301, and the heating device 5 can dissipate heat into the main air duct 201 through the radiator substrate 9.

[0052] In addition to the above-mentioned air-cooled radiator, the utility model further provides a photovoltaic inverter, which includes the air-cooled radiator in any of the above-mentioned embodiments, and the beneficial effects can be referred to the above-mentioned embodiments accordingly.

[0053] Among them, Figure 2 As shown, the housing 1 is divided into a receiving chamber 101 and a cooling chamber 102 by a partition 3. The receiving chamber 101 is used to install the heating device 5. An air-cooled radiator is arranged in the cooling chamber 102, and an air inlet 1021 and an air outlet 1022 are provided on the housing 1 at the periphery of the cooling chamber 102. Specifically, the air inlet 1021 is provided with an air inlet grille, and the air outlet 1022 is provided with an air outlet grille.

[0054] The first air duct plate 801 and the second air duct plate 202 are sequentially arranged in the cooling cavity 102 along the direction close to the partition 3. The second air duct plate 202, the partition 3 and the part of the box body 1 located between the second air duct plate 202 and the partition 3 are connected to form the main air duct shell 2, and the internal space is used as the main air duct 201. Specifically, the radiator substrate 9 can be attached to the partition 3, and the heat dissipation hole 301 is also opened on the partition 3. In addition, the accommodating cavity 101 is provided with a circuit board 4 and a power device 6, and the heating device 5 is fixed on the circuit board 4, and the other side is in contact with the radiator substrate 9.

[0055] The first air duct plate 801 and the portion of the box body 1 between the first air duct plate 801 and the second air duct plate 202 are connected to form an outer air duct plate 8. In the box body 1, the interlayer space defined by the first air duct plate 801 and the second air duct plate 202 serves as a diversion air duct 804, and the second air duct plate 202 is close to the top of the radiator fin 901 in the main air duct.

[0056] The photovoltaic inverter in this embodiment is applied Figures 2 to 3 The air-cooled radiator explains the air-cooling principle:

[0057] When the machine is running, the heat of the heating element is transferred to the radiator fins 901 through the radiator substrate 9 in contact with it. The air outside the box 1 enters the cooling chamber 102 driven by the cold air source 7. The air blown out by the cold air source 7 is divided into two parts, most of which enters the gap between the radiator fins 901 in the main air duct 201 and directly absorbs the heat on the radiator fins 901. This part is the main airflow 701; a small part enters the diversion air duct 804 in the interlayer of the air duct plate, which is the interlayer airflow 702. The middle air induction hole 805 and the terminal air induction hole 806 introduce the interlayer airflow 702 into the gap between the radiator fins 901 twice and mix it with the main airflow 701. Specifically, the interlayer airflow 702 entering the split air duct 804 flows along the airflow direction, and a part of the air in the split air duct 804 is introduced into the gap between the radiator fins 901 along the corresponding air guide plate 802 through the middle air induction hole 805 as the first air induction airflow 7021, and mixed with the main airflow 701. The air in the split air duct 804 that has not entered the middle air induction hole 805 continues to flow forward, and when it reaches the terminal air induction hole 806, this part of the air enters the gap between the radiator fins 901 as the second air induction airflow 7022 along the sealing plate 803, and is mixed with the main airflow 701 for cooling.

[0058] Based on the application of this air-cooled radiator, the temperature of the main air flow 701 located at the rear of the main air duct 201 can be reduced, and the heat transfer condition of the rear half of the radiator can be improved. Through the heat transfer path of heating element-heat sink substrate 9-heat sink fin 901-air in the main air duct 201, the temperature of the heating elements such as heating element No. 3 503 and heating element No. 4 504 located at the rear position along the air flow in the main air duct 201 can be finally improved, thereby improving the heat dissipation and cooling effect of the heating device 5.

[0059] It should be noted that when an element is referred to as "fixed" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element in the middle at the same time. In addition, in the description of the present utility model, unless otherwise specified, "multiple", "multiple roots", and "multiple groups" mean two or more.

[0060] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0062] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] The air-cooled radiator and photovoltaic inverter provided by the utility model are introduced in detail above. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An air-cooled radiator, characterized in that: The invention comprises a cold air source (7), a main air duct shell (2) and an outer air duct plate (8), wherein a main air duct (201) is provided through the main air duct shell (2), and the air flow in the main air duct (201) is used to cool a heating device (5); the outer air duct plate (8) is externally arranged and connected to the main air duct shell (2), and a bypass air duct (804) is formed between the outer air duct plate (8) and the main air duct shell (2), and the end of the bypass air duct (804) is sealed by a sealing plate (803); an air induction hole (807) is provided on the main air duct shell (2), and the air induction hole (807) connects the bypass air duct (804) with the main air duct (201); the cold air source (7) can provide air flow to the main air duct (201) and the bypass air duct (804) respectively.

2. The air-cooled radiator according to claim 1, characterized in that: The air induction holes (807) include terminal air induction holes (806); in the direction of airflow in the diversion air duct (804), the terminal end of the terminal air induction hole (806) is butted against the sealing plate (803).

3. The air-cooled heat sink according to claim 1, characterized in that: The sealing plate (803) is arranged to be inclined relative to the flow direction of the airflow in the diverter air duct (804), and along the flow direction of the airflow in the diverter air duct (804), the sealing plate (803) gradually deviates toward the main air duct shell (2).

4. The air-cooled heat sink according to claim 1, characterized in that: The air induction holes (807) include a middle air induction hole (805); in the direction of airflow in the diversion air duct (804), the middle air induction hole (805) is connected to the middle of the diversion air duct (804).

5. The air-cooled radiator according to claim 4, characterized in that: The diversion air duct (804) also includes an air guide plate (802) corresponding to the central air inlet hole (805); a gap is provided between the end of the air guide plate (802) away from the main air duct (201) and the outer air duct plate (8) for air flow to pass through; the air guide plate (802) is connected to the main air duct shell (2), and the connection point is located at the end of the corresponding central air inlet hole (805) in the air flow direction of the diversion air duct (804); the air guide plate (802) is inclined relative to the air flow direction in the diversion air duct (804), and along the air flow direction in the diversion air duct (804), the air guide plate (802) gradually deviates toward the main air duct shell (2).

6. The air-cooled heat sink according to claim 5, characterized in that: The plurality of middle air inlet holes (805) and the air guide plates (802) corresponding to each of the middle air inlet holes (805) are arranged in sequence along the air flow direction of the diversion air duct (804), and in the air flow direction of the diversion air duct (804), the distance between one end of each of the air guide plates (802) away from the main air duct (201) and the outer air duct plate (8) gradually decreases.

7. The air-cooled heat sink according to claim 1, characterized in that: The airflow direction in the main air duct (201) is the same as the airflow direction in the branch air duct (804).

8. The air-cooled radiator according to any one of claims 1 to 7, characterized in that: It also includes a heating device (5) externally arranged on the main air duct (201), wherein the heating device (5) and the external air duct plate (8) are respectively arranged on two opposite sides outside the main air duct shell (2), and the heating device (5) includes a plurality of heating elements arranged in sequence along the air flow direction of the main air duct (201).

9. The air-cooled heat sink according to claim 8, characterized in that: The main air duct shell (2) is provided with a heat dissipation hole (301), a radiator substrate (9) and a radiator fin (901) fixed to the radiator substrate (9) are arranged inside the main air duct shell (2), the radiator substrate (9) is attached to the inner wall of the main air duct shell (2) and covers the heat dissipation hole (301), the heating device (5) contacts the radiator substrate (9) through the heat dissipation hole (301), and the heating device (5) can dissipate heat into the main air duct (201) through the radiator substrate (9).

10. A photovoltaic inverter, characterized in that: The invention comprises a housing (1), wherein a accommodating chamber (101) and a cooling chamber (102) are separated by a partition (3) in the housing (1), wherein the accommodating chamber (101) is used to install a heating device (5), and an air-cooled radiator according to any one of claims 1 to 9 is arranged in the cooling chamber (102); an air inlet (1021) and an air outlet (1022) are provided in a portion of the housing (1) located outside the cooling chamber (102), and a first air duct plate (1021) and an air outlet (1022) are arranged in sequence in the cooling chamber (102) along a direction close to the partition (3). The first air duct plate (801) is fitted and fixed to the housing (1); the second air duct plate (202), the partition plate (3) and the portion of the housing (1) between the second air duct plate (202) and the partition plate (3) constitute the main air duct shell (2); the first air duct plate (801) and the portion of the housing (1) between the first air duct plate (801) and the second air duct plate (202) constitute the outer air duct plate (8).

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