Heat dissipation device of power conversion equipment

Abstract

The utility model belongs to the technical field of power supply system equipment, and particularly relates to a heat dissipation device of power conversion equipment, which comprises an equipment cavity, a heat exchange cavity, a heat dissipation cavity, an output wiring cavity and a connection relation thereof. According to the utility model, the heat exchange cavity is arranged and exchanges heat with the interior of the equipment cavity, so that the heat dissipation of the internal environment of the equipment cavity is facilitated; the device with high heat productivity is mounted outside the equipment cavity, the internal and external spaces of the equipment are reasonably utilized, and the device with high heat productivity is quickly cooled through the heat dissipation cavity, so that the temperature of the device is reduced, and the service life of the whole machine is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply system equipment, in particular to a heat dissipation device for power conversion equipment. Background Art

[0002] New energy sources such as photovoltaics or chemical energy storage convert direct current into alternating current through string power conversion equipment to achieve power access to the grid. The outer wall of the existing outdoor new energy power conversion equipment chassis only dissipates heat from the equipment through natural heat dissipation to meet the life requirements of internal components. However, as the conversion power becomes higher and higher, such as equipment above 350KW, it is necessary to take into account both sealing and size requirements. The existing technology cannot effectively utilize the internal space and the optimal heat exchange capacity, which may cause the temperature inside the equipment chassis to be too high, thus affecting the normal operation of the equipment. Utility Model Content

[0003] The purpose of the utility model is to solve the technical problems existing in the background technology, and for this purpose, a heat dissipation device for power conversion equipment is provided.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A heat dissipation device for a power conversion device, comprising a device cavity and a heat exchange cavity;

[0006] A first internal heat exchange fan, a second internal heat exchange fan and a first group of heat dissipation components are installed in the device cavity, a first opening and a second opening are respectively opened at the bottom and the top of one side wall of the device cavity, an air flow channel is formed in the device cavity along the first opening, the first internal heat exchange fan, the second internal heat exchange fan and the second opening, and the first group of heat dissipation components are installed and distributed along the air flow channel;

[0007] A heat exchanger and an external heat exchange fan are installed in the heat exchange cavity, and the heat exchanger includes a first air collecting cavity and a second air collecting cavity; the first air collecting cavity and the second air collecting cavity are respectively located at two ends of the heat exchanger and the two are connected through a heat exchange pipe;

[0008] The first air collecting cavity is communicated with the first opening, and the second air collecting cavity is communicated with the second opening.

[0009] The following is a technical solution further defined by the present utility model, which also includes a heat dissipation cavity, wherein the heat exchange cavity and the equipment cavity are fixedly connected, the heat dissipation cavity and the equipment cavity are fixedly connected, the heat exchange cavity and the heat dissipation cavity are fixedly connected and are separated by a partition.

[0010] The following is a technical solution further defined by the present utility model: a group of heat exchange fins are welded to the outer wall of the heat exchange tube.

[0011] The following is a technical solution further defined by the present utility model, wherein the heat exchange cavity comprises a heat exchange wall structure, and a first heat exchange air inlet and a second heat exchange air inlet are respectively provided at the bottom and the side of the heat exchange wall structure, and the external heat exchange fan is installed on the heat exchange wall structure at a position away from the first heat exchange air inlet and the second heat exchange air inlet.

[0012] The following is a technical solution further defined by the utility model, wherein a radiator fin, a cooling fan and a second group of heat dissipation components are installed in the heat dissipation cavity, a heat dissipation air inlet is opened in the middle of one side wall of the heat dissipation cavity, a first heat dissipation air outlet is opened at the top of the other side wall of the heat dissipation cavity, a second heat dissipation air outlet is opened on the bottom wall of the heat dissipation cavity, and the heat dissipation fan is installed near the heat dissipation air inlet;

[0013] The second group of heat dissipation components in the device cavity are connected to the heat sink fins via the interface material.

[0014] The following is a technical solution further defined by the present utility model, wherein the heat dissipation cavity includes a heat dissipation wall structure, the heat dissipation air inlet is arranged in the middle of the heat dissipation wall structure, the first heat dissipation air outlet is arranged at the top of the heat dissipation wall structure, and the second heat dissipation air outlet is arranged at the bottom of the heat dissipation wall structure.

[0015] The following is a technical solution further defined by the present utility model: the equipment cavity includes an equipment wall structure, and the first opening and the second opening are respectively arranged at the bottom and the top of the equipment wall structure.

[0016] The following is a technical solution further defined by the present utility model, wherein the first group of heat components to be cooled includes a first internal heat component to be cooled, a second internal heat component to be cooled and a third internal heat component to be cooled; the first internal heat component to be cooled, the second internal heat component to be cooled and the third internal heat component to be cooled are installed in sequence along the airflow direction generated by the first opening, the first internal heat exchange fan, the second internal heat exchange fan and the second opening.

[0017] The following is a technical solution further defined by the present utility model, wherein the second group of heat dissipation components includes a first external heat dissipation component, a second external heat dissipation component and a third external heat dissipation component, wherein the third external heat dissipation component is located in the device cavity, and the third external heat dissipation component is connected to the radiator fins through an interface material, and the first external heat dissipation component and the second external heat dissipation component are respectively installed at the top and bottom of the heat dissipation cavity.

[0018] The following is a technical solution further defined by the present utility model: the outer side wall of the equipment cavity is fixedly connected to the output wiring cavity, and an input MPPT wiring module is fixedly installed in the equipment cavity.

[0019] Compared with the prior art, the utility model has the following technical effects:

[0020] The utility model is provided with a heat exchange cavity, which exchanges heat with the inside of the equipment cavity, helping to promote the heat dissipation of the internal environment of the equipment cavity; devices with large heat generation are installed outside the equipment cavity, rationally utilizing the space inside and outside the equipment, and then the heat dissipation cavity is used to quickly dissipate the heat of the devices with large heat generation, thereby reducing the temperature of the equipment devices and increasing the service life of the entire machine.

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure of the heat exchange cavity and the heat dissipation cavity in the utility model and the direction of the airflow generated therein;

[0024] Figure 2 It is a schematic diagram of the main structure of the device cavity in the utility model and the direction of the airflow it generates;

[0025] Figure 3 It is a schematic diagram of the side view structure of the equipment cavity in the utility model and the direction of the airflow it generates;

[0026] Figure 4 It is a schematic diagram of the external structure of the heat exchange cavity and the heat dissipation cavity in the utility model and the flow direction of the airflow generated therein;

[0027] Figure 5 It is a schematic diagram of the top view structure of the equipment cavity, heat exchange cavity and heat dissipation cavity in the utility model and the direction of the airflow generated therein;

[0028] Figure 6 It is a structural schematic diagram of an embodiment of the utility model in which the airflow direction of the heat exchange cavity changes;

[0029] Figure 7 It is a structural schematic diagram of another embodiment of the utility model in which the airflow direction of the heat exchange cavity changes.

[0030] Reference numerals:

[0031] 10. heat exchange cavity; 11. heat exchanger; 111. first air collection cavity; 112. second air collection cavity; 113. heat exchange tube; 114. heat exchange fin; 12. external heat exchange fan; 13. heat exchange wall structure; 131. first heat exchange air inlet; 132. second heat exchange air inlet;

[0032] 20. heat dissipation cavity; 21. radiator fins; 22. heat dissipation fan; 23. first external heat dissipation component to be dissipated; 24. second external heat dissipation component to be dissipated; 25. third external heat dissipation component to be dissipated; 26. heat dissipation wall structure; 261. first heat dissipation air outlet; 262. second heat dissipation air outlet; 263. partition; 264. heat dissipation air inlet;

[0033] 30. Equipment cavity; 301. First opening; 302. Second opening; 31. Equipment wall structure; 311. Cabinet wall; 32. First internal heat exchange fan; 33. Second internal heat exchange fan; 34. First group of heat dissipation components; 341. First internal heat dissipation component; 342. Second internal heat dissipation component; 343. Third internal heat dissipation component; 35. Input MPPT wiring module;

[0034] 40. Output wiring cavity. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0039] It should be noted that in Figure 2 and 3 In the figure, the first direction is the width direction of the device cavity 30; the second direction is the height direction of the device cavity 30; and the third direction is the thickness direction of the device cavity 30.

[0040] like Figure 1-7 As shown, a heat dissipation device for a power conversion device is provided, which helps to promote heat dissipation inside and outside the chassis, reasonably utilize the space inside and outside the equipment, reduce the temperature of equipment components and increase the operating life of the entire machine.

[0041] The heat dissipation device of this embodiment includes a device cavity 30, a heat exchange cavity 10, a heat dissipation cavity 20 and an output wiring cavity 40. There are a large number of components that generate heat due to the execution of electronic functions inside the device cavity 30. The heat exchange cavity 10 provides heat exchange function for the heat-generating components inside the device cavity 30 to reduce the ambient temperature inside the device cavity 30. The heat dissipation cavity 20 performs thermal management on power devices with high heat generation to reduce the operating temperature of the devices. The output wiring cavity 40 is used to install output cables to output the fixed-frequency current produced by the device to the external power grid. Figure 5 As shown, the outer wall of the heat exchange cavity 10 and the equipment cavity 30 are fixedly connected; the heat dissipation cavity 20 and the outer wall of the equipment cavity 30 are fixedly connected; the output wiring cavity 40 and the outer wall of the equipment cavity 30 are fixedly connected; the heat exchange cavity 10 and the heat dissipation cavity 20 are fixedly connected and separated by a partition 263.

[0042] like Figure 1 and 4As shown, the heat exchange cavity 10 provides an independent heat exchange space for the heat exchange of the heat exchanger 11. The heat exchange cavity 10 includes the heat exchanger 11, the external heat exchange fan 12 and the heat exchange wall structure 13 arranged to form an independent flow channel. The heat exchanger 11 includes a first air collecting cavity 111, a second air collecting cavity 112, a heat exchange tube 113 and a heat exchange fin 114. The heat exchange tube 113 is an internal hollow thin-walled metal tube arranged in a certain manner; the heat exchange fin 114 is a parallel arranged thin-walled metal fin, and is welded to the heat exchange tube 113. The first air collecting cavity 111 and the second air collecting cavity 112 are respectively located at the two ends of the heat exchanger 11 and the two are connected through the heat exchange tube 113. The two air collecting cavities are provided with openings corresponding to the heat exchange tube 113 to realize the circulation of air between the two air collecting cavities.

[0043] The bottom and side of the heat exchange wall structure 13 are respectively provided with a first heat exchange air inlet 131 and a second heat exchange air inlet 132. The external heat exchange fan 12 is fixedly installed on the heat exchange wall structure 13 at a position away from the first heat exchange air inlet 131 and the second heat exchange air inlet 132. The external environment cold air enters the heat exchange cavity 10 from the first heat exchange air inlet 131 and the second heat exchange air inlet 132, and the cold air is heated to hot air after convection heat exchange with the heat exchange tube 113 and the heat exchange fin 114, and is drawn out of the heat exchange cavity 10 through the heat exchange fan.

[0044] The heat dissipation cavity 20 is an independent heat dissipation space provided for the heat dissipation of the second group of heat dissipation components. The heat dissipation cavity 20 includes a radiator fin 21, a heat dissipation fan 22, a first external heat dissipation component 23, a second external heat dissipation component 24, and a third external heat dissipation component 25, and a heat dissipation wall structure 26 provided to form an independent flow channel. The heat dissipation fan 22 is installed near the heat dissipation air inlet 264. The top, bottom, and middle of the heat dissipation wall structure 26 are respectively provided with a first heat dissipation air outlet 261, a second heat dissipation air outlet 262, and a heat dissipation air inlet 264. The third external heat dissipation component 25 to be cooled in the equipment cavity 30 is indirectly contacted with the radiator fin 21 through the interface material for heat conduction. It should be noted that the interface material in this embodiment is a material with high thermal conductivity, which is a prior art and is not within the protection scope of the present utility model. Therefore, this embodiment does not describe the interface material in detail.

[0045] In this embodiment, the first external heat dissipation component 23 to be cooled can be an inverter inductor, and the second external heat dissipation component 24 to be cooled can be a boost inductor, both of which are devices with relatively large heat generation, and are respectively installed at the top and bottom of the heat dissipation cavity 20. The heat dissipation fan 22 is placed on the back of the heat dissipation cavity 20, that is, installed on the sheet metal on the back of the heat dissipation wall structure 26. The sheet metal installation position is provided with a mesh opening, which serves as a heat dissipation air inlet 264 for the heat dissipation fan 22. The air from the external environment enters the heat dissipation cavity 20 from the heat dissipation air inlet 264, and the heat dissipation fan 22 works on the air and blows it toward the radiator fins 21, taking away the heat generated by the third external heat dissipation component 25 installed in the equipment cavity 30. One path of air continues to flow upward to cool the first external heat dissipation component 23, and the other path of air continues to flow downward to cool the second external heat dissipation component 24, and the heated hot air flows out to the external environment. Among them, the third external heat dissipation component 25 to be cooled can be a power device on a power board.

[0046] It should be noted that the second group of heat dissipation components are components with relatively large heat generation, and the components are commonly used in power conversion equipment. Therefore, the second group of heat dissipation components are not described in detail in this embodiment.

[0047] It should be noted that the above-mentioned heat exchange fan and heat dissipation fan 22 can be one or more.

[0048] The equipment cavity 30 includes a power board, an output board, a filter board, a capacitor board, a power supply board, a control board, a communication board, etc. or a printed circuit board integrating the aforementioned different functional boards, components placed on the aforementioned printed circuit board, an internal heat exchange fan and connecting wires, etc. This embodiment will not be described in detail.

[0049] like Figure 2 and 3 As shown, the equipment cavity 30 specifically includes an equipment wall structure 31, a first internal heat exchange fan 32, a second internal heat exchange fan 33, a first internal heat dissipation component 341, a second internal heat dissipation component 342, a third internal heat dissipation component 343 and an input MPPT wiring module 35. The equipment wall structure 31 encloses the equipment into a space and seals the equipment through an outer cover plate.

[0050] The equipment cavity 30 is separated from the heat exchange cavity 10 and the heat dissipation cavity 20 by a cabinet wall 311 , and the cabinet wall 311 is provided with a first opening 301 , a second opening 302 , and an opening for heat dissipation of a third external heat dissipating element 25 .

[0051] An airflow channel is formed in the equipment cavity 30 along the first opening 301, the first internal heat exchange fan 32, the second internal heat exchange fan 33 and the second opening 302, and the first group of heat dissipation components 34 are installed and distributed along the airflow channel. Specifically, the first internal heat exchange fan 32 is installed near the first opening 301, and the second internal heat exchange fan 33 is installed away from the first opening 301 and the second opening 302. The first internal heat dissipation component 341, the second internal heat dissipation component 342 and the third internal heat dissipation component 343 are installed in sequence along the airflow channel. It should be noted that the first group of heat dissipation components 34 are components with relatively low heat generation, and the components are commonly used components in power conversion equipment. Therefore, the first group of heat dissipation components 34 are not described in detail in this embodiment.

[0052] The heat exchange cavity 10 is located on one side of the heat dissipation cavity 20 , and each has an independent air duct without interfering with each other.

[0053] The first air collecting cavity 111 and the second air collecting cavity 112 on the heat exchanger 11 are respectively connected to the first opening 301 and the second opening 302 to achieve the circulation of air between the equipment cavity 30 and the air inside the heat exchanger 11 .

[0054] like Figure 2 As shown, the first opening 301 and the second opening 302 are respectively located at the lower right part and the upper right part of the cabinet wall 311. A first internal heat exchange fan 32 is provided at the first opening 301 as a flow guide mechanism. The first opening 301 is an air inlet from the first air collection cavity 111 of the heat exchanger 11 to the equipment cavity 30; correspondingly, the second opening 302 is an air inlet from the equipment cavity 30 to the second air collection cavity 112 of the heat exchanger 11; the second internal heat exchange fan 33 can change the flow guide direction and guide the airflow to the second opening 302 more quickly.

[0055] The first internal heat dissipation component 341 and the third internal heat dissipation component 343 are placed parallel to the cabinet wall 311, and the printed circuit board of the second internal heat dissipation component 342 is perpendicular to the cabinet wall 311. The second internal heat dissipation component 342 is an electrolytic capacitor board or an integrated board of electrolytic capacitors and other functional boards that is more sensitive to temperature. Among them, the first internal heat dissipation component 341 can be a device on a power board, and the third internal heat dissipation component 343 can be a device on an output board.

[0056] The second internal heat exchange fan 33 is located at the upper middle side of the left side of the equipment cavity 30, and between the first internal heat dissipation component 341 and the second internal heat dissipation component 342; the first internal heat exchange fan 32 is located at the first opening 301, that is, the first internal heat exchange fan 32 is located at the lower right side of the equipment cavity 30.

[0057] like Figure 2 and 3As shown, the air in the first opening 301 is the cold air cooled by the heat exchanger 11, the first internal heat exchange fan 32 extracts the cold air from the first air collecting cavity 111 of the heat exchanger 11 from the third direction, and blows it to the equipment cavity 30 from the right side to the left side in the first direction, and the second internal heat exchange fan 33 blows air to the first internal heat element to be cooled 341 from the left side to the right side in the first direction. In this case, the left side of the second internal heat exchange fan 33 is in a negative pressure zone due to the fan exhaust, and the left side of the first internal heat exchange fan 32 is in a positive pressure zone due to its fan blowing, so a large amount of cold air blown out by the first internal heat exchange fan 32 will gradually tilt upward to flow to the lower part of the second internal heat element to be cooled 342 for heat exchange, and then the air flows to the left side of the second internal heat exchange fan 33, and the air is blown to the first internal heat element to be cooled 341 through the second internal heat exchange fan 33, taking away a large amount of heat generated thereon, and heating the air to high-temperature air. Since the second opening 302 is the air inlet from the equipment cavity 30 to the heat exchange cavity 10, the area around the opening is a negative pressure zone. Therefore, the high-temperature air that absorbs a large amount of heat and is blown out by the second internal heat exchange fan 33 flows to the negative pressure area near the second opening 302, enters the second air collecting cavity 112 of the heat exchanger 11, and exchanges heat with the external circulating air through the heat exchange tube 113 and the heat exchange fins 114. After being cooled into cold air, it continues to flow back to the first air collecting cavity 111, and then returns to the equipment cavity 30 through the first opening 301 and the first internal heat exchange fan 32, completing an internal circulation.

[0058] For the heat exchanger 11 with external circulation, the external heat exchange fan 12 draws air into the heat exchange cavity 10, resulting in a negative pressure environment in the cavity. The external environment cold air enters the heat exchange cavity 10 from the first heat exchange air inlet 131 and the second heat exchange air inlet 132, and performs convection heat exchange with the heat exchange tube 113 and the heat exchange fin 114 of the heat exchanger 11, taking away the heat of the internal circulation hot air, thereby achieving the purpose of reducing the temperature of the ambient air inside the equipment cavity 30.

[0059] This embodiment can achieve high-efficiency heat exchange performance of internal and external circulating air without occupying internal space and increasing the size of the entire machine.

[0060] like Figure 6 As shown, the external heat exchange fan 12 blows air into the heat exchange cavity 10, and the cold air is discharged from the back after exchanging heat with the heat exchanger 11.

[0061] like Figure 7 As shown, the external heat exchange fan 12 is installed at the bottom of the heat exchange cavity 10 to draw air out from the inside of the heat exchange cavity 10 , and the cavity air inlet is located on the side of the heat exchange cavity 10 .

[0062] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the above disclosed methods and technical contents without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, all equivalent changes made according to the shape, structure and principle of the utility model without departing from the content of the technical solution of the utility model should be included in the protection scope of the utility model.

Claims

1. A heat dissipation device for a power conversion device, characterized in that: It comprises an equipment cavity (30) and a heat exchange cavity (10); A first internal heat exchange fan (32), a second internal heat exchange fan (33) and a first group of heat dissipation components (34) are installed in the equipment cavity (30); a first opening (301) and a second opening (302) are respectively provided at the bottom and the top of one side wall of the equipment cavity (30); an air flow channel is formed in the equipment cavity (30) along the first opening (301), the first internal heat exchange fan (32), the second internal heat exchange fan (33) and the second opening (302); and components of the first group of heat dissipation components (34) are installed and distributed along the air flow channel; A heat exchanger (11) and an external heat exchange fan (12) are installed in the heat exchange cavity (10); the heat exchanger (11) comprises a first air collecting cavity (111) and a second air collecting cavity (112); the first air collecting cavity (111) and the second air collecting cavity (112) are respectively located at two ends of the heat exchanger (11) and the two are connected via a heat exchange pipe (113); The first air collecting cavity (111) is in communication with the first opening (301), and the second air collecting cavity (112) is in communication with the second opening (302).

2. A heat dissipation device for a power conversion device as claimed in claim 1, characterized in that: It also includes a heat dissipation cavity (20), the heat exchange cavity (10) and the equipment cavity (30) are fixedly connected, the heat dissipation cavity (20) and the equipment cavity (30) are fixedly connected, the heat exchange cavity (10) and the heat dissipation cavity (20) are fixedly connected and are separated by a partition (263).

3. A heat dissipation device for a power conversion device as claimed in claim 2, characterized in that: A group of heat exchange fins (114) is welded to the outer wall of the heat exchange tube (113).

4. A heat dissipation device for a power conversion device as claimed in claim 2, characterized in that: The heat exchange cavity (10) comprises a heat exchange wall structure (13), the bottom and side of the heat exchange wall structure (13) are respectively provided with a first heat exchange air inlet (131) and a second heat exchange air inlet (132), and the external heat exchange fan (12) is installed on the heat exchange wall structure (13) at a position away from the first heat exchange air inlet (131) and the second heat exchange air inlet (132).

5. A heat dissipation device for a power conversion device as claimed in claim 2, characterized in that: The heat dissipation cavity (20) is installed with heat sink fins (21), a heat dissipation fan (22) and a second group of heat dissipation components; a heat dissipation air inlet (264) is provided in the middle of one side wall of the heat dissipation cavity (20); a first heat dissipation air outlet (261) is provided at the top of the other side wall of the heat dissipation cavity (20); a second heat dissipation air outlet (262) is provided at the bottom wall of the heat dissipation cavity (20); and the heat dissipation fan (22) is installed near the heat dissipation air inlet (264); The second group of heat dissipating components in the equipment cavity (30) are connected to the heat sink fins (21) via the interface material.

6. A heat dissipation device for power conversion equipment as claimed in claim 5, characterized in that: The heat dissipation cavity (20) comprises a heat dissipation wall structure (26), the heat dissipation air inlet (264) is arranged at the middle of the heat dissipation wall structure (26), the first heat dissipation air outlet (261) is arranged at the top of the heat dissipation wall structure (26), and the second heat dissipation air outlet (262) is arranged at the bottom of the heat dissipation wall structure (26).

7. A heat dissipation device for a power conversion device as claimed in claim 1, characterized in that: The equipment cavity (30) comprises an equipment wall structure (31), and the first opening (301) and the second opening (302) are respectively arranged at the bottom and the top of the equipment wall structure (31).

8. The heat dissipation device of a power conversion device according to claim 1, characterized in that: The first group of heat dissipation components (34) includes a first internal heat dissipation component (341), a second internal heat dissipation component (342) and a third internal heat dissipation component (343); the first internal heat dissipation component (341), the second internal heat dissipation component (342) and the third internal heat dissipation component (343) are installed in sequence along the airflow direction generated by the first opening (301), the first internal heat exchange fan (32), the second internal heat exchange fan (33) and the second opening (302).

9. A heat dissipation device for power conversion equipment as claimed in claim 5, characterized in that: The second group of heat dissipation components includes a first external heat dissipation component (23), a second external heat dissipation component (24) and a third external heat dissipation component (25). The third external heat dissipation component (25) is located in the device cavity (30). The third external heat dissipation component (25) is connected to the heat sink fins (21) via an interface material. The first external heat dissipation component (23) and the second external heat dissipation component (24) are respectively installed at the top and bottom of the heat dissipation cavity (20).

10. The heat dissipation device of a power conversion device according to claim 1, characterized in that: The outer side wall of the equipment cavity (30) is fixedly connected to the output wiring cavity (40), and an input MPPT wiring module (35) is fixedly installed in the equipment cavity (30).

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