Power conversion device

Abstract

This application discloses a power conversion device, belonging to the field of electrical equipment heat dissipation technology. The power conversion device includes: a chassis with multiple internal cavities; and a heat exchange assembly disposed in one of the internal cavities. The heat exchange assembly includes a heat pipe, a substrate, and a first enclosure. The heat pipe passes through the substrate, with its evaporation section and condensation section located on opposite sides of the substrate along a first direction, corresponding to the thickness direction of the substrate. The first enclosure is disposed on one side of the substrate along the first direction, forming an air cavity and an opening communicating with the air cavity. One of the evaporation section and the condensation section is disposed in the air cavity, and the opening communicates with at least one other internal cavity. The heat pipe has high thermal conductivity, enabling rapid heat exchange between the evaporation section and the air in their respective internal cavities. This allows the ambient temperature of the internal cavity after heat exchange with the evaporation section to decrease in a short time, thus improving the heat dissipation effect of the device.

Description

Technical Field

[0001] This application relates to the field of heat dissipation technology for electrical equipment, and more particularly to a power conversion device. Background Technology

[0002] Power converters are an important component of power electronics technology, widely used in various electronic devices, power equipment, and power systems. With increasing power demands on power converters, the need for heat dissipation is also growing more stringent. Therefore, improving the heat dissipation performance of these devices has become a pressing issue. Utility Model Content

[0003] This application provides a power conversion device aimed at solving the technical problem of how to improve the heat dissipation effect of the device.

[0004] This application provides a power conversion device, including: The chassis has multiple internal cavities; A heat exchange assembly is disposed in one of the inner cavities. The heat exchange assembly includes a heat pipe, a substrate, and a first enclosure portion. The heat pipe passes through the substrate, and the evaporation section and the condensation section of the heat pipe are respectively located on both sides of the substrate along a first direction, which corresponds to the thickness direction of the substrate. The first enclosure portion is disposed on one side of the substrate along the first direction, and together with the substrate, forms an air cavity and an opening communicating with the air cavity. One of the evaporation section and the condensation section is disposed in the air cavity, and the opening is connected to at least one of the inner cavities.

[0005] In some embodiments, the power conversion device further includes a first fan, which is disposed in the inner cavity communicating with the opening and is disposed opposite to the opening.

[0006] In some embodiments, the heat exchange assembly further includes a flow divider plate disposed within the air cavity and connected to the first enclosure portion. The flow divider plate divides the air cavity into a first region and a second region, and a connecting port connecting the first region and the second region. The first region and the second region are arranged along the first direction, and the connecting port is located on the side of the flow divider plate away from the opening. One of the evaporation section and the condensation section is disposed in the first region. In the second direction, the first fan is disposed opposite to the portion of the opening corresponding to the first region, or the first fan is disposed opposite to the portion of the opening corresponding to the second region. The second direction intersects with the first direction.

[0007] In some embodiments, the heat exchange assembly further includes a second enclosure portion disposed on the side of the substrate away from the first enclosure portion, and together with the substrate forming a heat exchange cavity and an exchange port communicating with the heat exchange cavity. One of the evaporation section and the condensation section is disposed in the air cavity, and the other is disposed in the heat exchange cavity, and exchanges heat with the air in the cavity through the exchange port.

[0008] In some embodiments, the number of exchange ports is provided to be multiple, and the multiple exchange ports are respectively provided on both sides of the second enclosure portion along the second direction.

[0009] In some embodiments, the power conversion device further includes a second fan, which is disposed opposite to the exchange port.

[0010] In some embodiments, the first direction is parallel to the horizontal direction or the direction of gravity; The heat pipe is arranged along the first direction, or the heat pipe is arranged at an angle to the first direction, and the height of the condensing section is higher than the height of the evaporating section.

[0011] In some embodiments, the power conversion device further includes electrical components disposed within the cavity.

[0012] In some embodiments, the chassis is provided with an exhaust vent, which is connected to the inner cavity that exchanges heat with the condenser section.

[0013] In some embodiments, the chassis is provided with a ventilation opening, the internal cavity which exchanges heat with the condensing section is connected to the ventilation opening, and the ventilation opening is disposed opposite to the condensing section.

[0014] In the power conversion device of this application embodiment, the heat pipe has high thermal conductivity, enabling rapid heat exchange between the evaporation section and the condensation section and the air in their respective inner cavities. This allows the ambient temperature of the inner cavity after heat exchange with the evaporation section to decrease in a short time, thus improving the heat dissipation effect of the device. The evaporation section and the condensation section are separated by a baffle, and the inner cavities that exchange heat with the evaporation section and the condensation section are independent of each other, reducing mutual thermal interference.

[0015] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0017] Figure 1 This is a schematic diagram of the power conversion device provided in the embodiments of this application; Figure 2 This is a schematic diagram showing the location of the first fan provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the diverter provided in the embodiments of this application; Figure 4 This is a structural schematic diagram showing the heat pipe installation direction provided in an embodiment of this application; Figure 5 Schematic diagrams of the first and second enclosure portions provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the heat exchange cavity and exchange port provided in the embodiments of this application; Figure 7 This is another structural schematic diagram of the power conversion device provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 1. Chassis; 10. Inner cavity; 11. First inner cavity; 12. Second inner cavity; 13. Exhaust vent; 14. Window structure; 16. Ventilation opening; 17. First enclosure; 18. Second enclosure; 2. Electrical components; 3. Heat exchange assembly; 31. Heat pipe; 311. Evaporation section; 312. Condensation section; 32. Substrate; 33. First enclosure; 330. Air cavity; 3303. First area; 3304. Second area; 3305. Connecting port; 331. Opening; 3311. Air inlet; 3312. Air outlet; 34. Diverter plate; 35. Heat sink; 36. Second enclosure; 360. Heat exchange chamber; 361. Exchange port; 4. First fan; 5. Second fan; X, First direction; Y, Second direction. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0020] In the description of this application, it should be understood that the terms "height," "thickness," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, and "at least one" can mean one, two, or more, unless otherwise expressly specified.

[0021] It should also be noted that in the accompanying drawings of the embodiments of this application, the arrow marked with X represents the first direction X, and the arrow marked with Y represents the second direction Y. The introduction of the first direction X and the second direction Y is to more clearly illustrate the structure and relative positional relationship of each component in the power conversion device. In practical applications, the first direction X and the second direction Y may change depending on the placement of the power conversion device.

[0022] This application provides a power conversion device; please refer to [link / reference]. Figure 1 and Figure 2 The power conversion device includes a chassis 1 and a heat exchange assembly 3. The chassis 1 has multiple cavities 10, which are independent of each other and are not interconnected. The cavities 10 are used to house electrical components.

[0023] A heat exchange assembly 3 is disposed in one of the inner cavities 10. The heat exchange assembly 3 includes a heat pipe 31, a substrate 32, and a first enclosure portion 33. The heat pipe 31 has an evaporation section 311 and a condensation section 312. The heat pipe 31 passes through the substrate 32. The evaporation section 311 and the condensation section 312 are respectively located on both sides of the substrate 32 along a first direction X, which corresponds to the thickness direction of the substrate 32. The first enclosure portion 33 is disposed on one side of the substrate 32 along the first direction X and forms an air cavity 330 and an opening 331 communicating with the air cavity 330 together with the substrate 32. One of the evaporation section 311 and the condensation section 312 is disposed in the air cavity 330. The opening 331 communicates with at least one other inner cavity 10, and air enters and exits the air cavity 330 through the opening 331. One of the evaporation section 311 and the condensation section 312 can directly exchange heat with the air in the inner cavity 10 where they are located, while the other exchanges heat with the air in another inner cavity 10 through the air cavity 330. For example, the evaporation section 311 is exposed in the inner cavity 10 where the heat exchange component 3 is located, the condensation section 312 is located in the air cavity 330, and the air in the other inner cavity 10 can flow to the air cavity 330 and contact the condensation section 312 for heat exchange. Alternatively, the condensation section 312 is exposed in the inner cavity 10 where the heat exchange component 3 is located, the evaporation section 311 is located in the air cavity 330, and the air in the other inner cavity 10 can flow to the air cavity 330 and contact the evaporation section 311 for heat exchange. For easy distinction, in the inner cavity 10 where the heat exchange component 3 is located and the inner cavity 10 that communicates with the opening 331, the inner cavity 10 in which the internal air can contact and exchange heat with the evaporation section 311 is the first inner cavity 11, and the inner cavity 10 in which the internal air can contact and exchange heat with the condensation section 312 is the second inner cavity 12. The second inner cavity 12 can be connected to the external environment of the chassis 1.

[0024] Heat pipe 31 utilizes phase change for heat transfer, exhibiting high thermal conductivity. It enables rapid heat exchange between the evaporation section 311 and the condensation section 312 and the air in their respective inner cavities 10. This allows the ambient temperature of the inner cavity 10 to decrease quickly after heat exchange with the evaporation section 311, improving the device's heat dissipation. The heat exchange assembly 3 is integrated within the chassis 1, saving overall space. The evaporation section 311 and the condensation section 312 are separated by the first enclosure 33, and the inner cavities 10 that exchange heat with the evaporation section 311 and the condensation section 312 are independent, reducing mutual thermal interference. Furthermore, the first enclosure 33 covers a portion of the heat pipe 31, allowing airflow to enter and exit the air chamber 330 through the opening 331. This limits the airflow path and concentrates the airflow through the heat pipe 31, enhancing the heat exchange efficiency with it.

[0025] Please see Figure 1 and Figure 2 In some embodiments, the first enclosure 33 includes a plurality of plates arranged around the outer periphery of the corresponding heat pipe 31 segment to cover the segment.

[0026] Please see Figure 1 and Figure 2 In some embodiments, the power conversion device further includes a first fan 4, which is disposed in the inner cavity 10 communicating with the opening 331, and is disposed opposite to the opening 331. The first fan 4 can be disposed opposite to the opening 331 on the air inlet side or the air outlet side. The first fan 4 plays the role of forcibly pulling airflow, which can enhance the heat exchange between the air and the evaporation section 311 or the condensation section 312 in the air cavity 330, and improve the heat exchange efficiency.

[0027] Please see Figure 3 In some embodiments, the heat exchange assembly 3 further includes a flow divider 34, which is disposed in the air cavity 330 and connected to the first enclosure portion 33. The flow divider 34 divides the air cavity 330 into a first region 3303 and a second region 3304, and a connecting port 3305 connecting the first region 3303 and the second region 3304. The first region 3303 and the second region 3304 are arranged along the first direction X. The connecting port 3305 is located on the side of the flow divider 34 away from the opening 331. That is, the inner side of the first enclosure portion 33 facing the opening 331 forms the connecting port 3305 with the flow divider 34 at intervals.

[0028] One of the evaporation section 311 and the condensation section 312 is located in the first region 3303. In the second direction Y, the first fan 4 is positioned opposite to the portion of the opening 331 corresponding to the first region 3303, or the first fan 4 is positioned opposite to the portion of the opening 331 corresponding to the second region 3304. The second direction Y intersects with the first direction X.

[0029] Specifically, the diverter 34 divides the opening 331 into an air inlet 3311 and an air outlet 3312. The air inlet 3311 communicates with one of the first region 3303 and the second region 3304, and the air outlet 3312 communicates with the other. The diverter 34 has an orthographic projection along the second direction Y, and this orthographic projection falls within the opening 331. Using the orthographic projection of the diverter 34 as a dividing reference, the opening 331 is divided into the air inlet 3311 and the air outlet 3312. The evaporation section 311 is disposed in the first region 3303, or the condensation section 312 is disposed in the first region 3303.

[0030] Please see Figure 1 and Figure 3 In one implementation, the air inlet 3311 is connected to the first region 3303, the air outlet 3312 is connected to the second region 3304, and the air outlet side of the first fan 4 faces the air inlet 3311.

[0031] Please see Figure 5 and Figure 6In another implementation, the air inlet 3311 is connected to the second region 3304, the air outlet 3312 is connected to the first region 3303, and the air inlet side of the first fan 4 faces the air outlet 3312.

[0032] The splitter plate 34 separates the air cavity 330, which limits the flow path of the airflow, reduces the mixing and interference between the inlet and outlet air, and facilitates the orderly flow of air.

[0033] Please see Figure 4 and Figure 5 In some embodiments, the heat exchange assembly 3 further includes a second enclosure portion 36, which is disposed on the side of the substrate 32 opposite to the first enclosure portion 33, and together with the substrate 32, forms a heat exchange cavity 360 and an exchange port 361 communicating with the heat exchange cavity 360. One of the evaporation section 311 and the condensation section 312 is disposed in the air cavity 330, and the other is disposed in the heat exchange cavity 360, and exchanges heat with the air in the inner cavity 10 through the exchange port 361. The heat pipe 31 is surrounded by the first enclosure portion 33 and the second enclosure portion 36, which on the one hand requires the air to exchange heat with the evaporation section 311 or the condensation section 312 inside the heat exchange cavity 360 through the exchange port 361, and the airflow path is limited to facilitate the planning of the airflow path. On the other hand, it can also protect the entire heat pipe 31.

[0034] Please see Figure 6 In some embodiments, multiple exchange ports 361 are provided, and the multiple exchange ports 361 are respectively provided on both sides of the second enclosure portion 36 along the second direction Y. Two exchange ports 361 allow airflow to flow unidirectionally from one exchange port 361 to the other exchange port 361, simplifying the airflow path and helping to reduce wind resistance.

[0035] Please see Figure 4 and Figure 5 In some embodiments, the power conversion device further includes a second fan 5, which is disposed opposite to the exchange port 361. The second fan 5 is disposed in the inner cavity 10 where the heat exchange component 3 is located. It can be disposed with the air inlet side facing the exchange port 361 or the air outlet side facing the air inlet 3311. The second fan 5 accelerates the heat exchange rate between the heat pipe 31 and the air inside the heat exchange cavity 360 by enhancing airflow.

[0036] When multiple exchange ports 361 are respectively set on both sides of the second enclosure 36 along the second direction Y, the second fan 5 can be set to correspond to one of the exchange ports 361, or each exchange port 361 can correspond to one second fan 5.

[0037] Please see Figure 3 and Figure 4In some embodiments, the first direction X is parallel to the horizontal direction or the direction of gravity, and the heat pipe 31 is arranged along the first direction X; or, the heat pipe 31 is arranged at an angle to the first direction X, and the height of the condensing section 312 is higher than the height of the evaporating section 311. That is, the heat pipe 31 is arranged along the direction of gravity, or the heat pipe 31 is arranged horizontally, or the heat pipe 31 is arranged at an angle to the horizontal direction or the direction of gravity, and the condensing section 312 is higher than the evaporating section 311. The different directions in which the heat pipe 31 is arranged can be selected based on factors such as the flow rate of the working fluid inside the heat pipe 31, the space required for the heat exchange components 3, and the overall installation direction of the equipment, so as to improve the flexibility of the equipment and its adaptability to different operating conditions.

[0038] Please see Figure 2 In some embodiments, the power conversion device further includes an electrical component 2, which is disposed in the inner cavity 10. In this embodiment, the electrical component 2 includes a circuit board, a power module, a controller, a transformer, a rectifier, and a capacitor. The circuit board, power module, and controller can be disposed in the first inner cavity 11, while the transformer, rectifier, and capacitor can be disposed in the second inner cavity 12. On the one hand, by transferring the heat in the first inner cavity 11 to the external environment of the chassis 1, the operational stability and reliability of the electrical component 2 are improved. On the other hand, the heat exchange assembly 3 utilizes the existing electrical space of the chassis 1, eliminating the need for additional space for heat dissipation of the condenser section 312, thus improving the utilization rate of space resources.

[0039] Please see Figure 1 In some embodiments, the chassis 1 is provided with an exhaust vent 13, which is connected to the inner cavity 10 that exchanges heat with the condenser section 312. That is, the exhaust vent 13 is connected to the second inner cavity 12. The exhaust vent 13 is connected to the external space of the chassis 1, so that the air in the second inner cavity 12 can flow and exchange with the external space through the exhaust vent 13.

[0040] In some other embodiments, the chassis 1 may be provided with a heat sink, such as an air-cooled heat sink or a cold plate, on the side wall corresponding to the second inner cavity 12. The heat sink transfers the heat in the second inner cavity 12 to the outside, so that the second inner cavity 12 acts as a closed chamber, thereby improving the safety level.

[0041] Please see Figure 5 In some embodiments, the chassis 1 is provided with a vent 16, which is connected to the inner cavity 10 that exchanges heat with the condenser section 312, and the vent 16 is positioned opposite to the condenser section 312. The inner cavity 10 that exchanges heat with the condenser section 312 is a second inner cavity 12, meaning that the second inner cavity 12 is connected to the vent 16. External air can flow in through the vent 16 and exchange heat with the condenser section 312. Since the air temperature in the external environment is lower than the ambient temperature of the second inner cavity 12, the heat dissipation effect on the condenser section 312 is enhanced.

[0042] Please see Figure 1 and Figure 2 In some embodiments, the heat exchange assembly 3 is disposed in the first inner cavity 11, the evaporation section 311 is directly exposed in the first inner cavity 11, and the condensation section 312 is housed in the air cavity 330. The power conversion device also includes a turbulence fan disposed in the first inner cavity 11 and opposite to the evaporation section 311, and a first fan 4 disposed in the second inner cavity 12 and located between the opening 331 and the vent 16. The turbulence fan is spaced between the electrical component 2 and the evaporation section 311, with the air inlet side of the turbulence fan facing the evaporation section 311 and the air outlet side facing the electrical component 2. The air outlet side of the first fan 4 faces the opening 331. When the equipment is operating, the electrical component 2 generates heat, causing the ambient temperature of the first inner cavity 11 to rise. The turbulence fan draws airflow through the first inner cavity 11, which flows through the evaporation section 311. The cooling medium inside the evaporation section 311 is heated, turns into a gas, and moves to the condensation section 312. After heat exchange with the evaporation section 311, the air temperature decreases, and the cold air is blown towards the electrical component 2 by the turbulence fan, cooling the electrical component 2 and simultaneously lowering the ambient temperature of the first inner cavity 11. The airflow drawn by the first fan 4 blows through the opening 331 towards the condensation section 312, dissipating heat and causing the cooling medium inside the condensation section 312 to turn into a liquid, which then flows back to the evaporation section 311. The air that has exchanged heat with the condensation section 312 flows into the second inner cavity 12 through the opening 331 and is discharged outside the casing 1 through the exhaust port 13.

[0043] The heat exchange assembly 3 is located in the first inner cavity 11, which can shorten the flow distance of cold air to the electrical component 2 and simplify the flow path, thereby improving the heat dissipation speed. The first enclosure 33 blocks the direct impact of the heat from the condensation section 312 on the electrical component 2, which helps to maintain the operating ambient temperature of the first inner cavity 11.

[0044] Please see Figure 4 In some embodiments, the heat exchange assembly 3 is disposed in the first inner cavity 11, the evaporation section 311 is housed in the heat exchange chamber 360, and the condensation section 312 is housed in the air chamber 330. A first fan 4 is disposed in the second inner cavity 12, located between the opening 331 and the vent 16, with the outlet side of the first fan 4 facing the opening 331 and the inlet side facing the vent 16. A second fan 5 is disposed in the first inner cavity 11, located between the exchange port 361 and the electrical component 2, with the inlet side of the second fan 5 facing the exchange port 361 and the outlet side facing the electrical component 2.

[0045] Please see Figure 5 and Figure 6In some embodiments, the heat exchange assembly 3 is disposed in the second inner cavity 12, the evaporation section 311 is housed in the air cavity 330, the condensation section 312 is housed in the heat exchange cavity 360, the first fan 4 is disposed in the first inner cavity 11, and the air inlet side of the first fan 4 is arranged facing the opening 331. The second fan 5 is disposed in the second inner cavity 12, and the second enclosure 36 is provided with exchange ports 361 on both sides. One exchange port 361 is located on the side of the second enclosure 36 closer to the first inner cavity 11, and the other exchange port 361 is located on the side of the second enclosure 36 away from the first inner cavity 11 and is arranged opposite to the vent 16. The second fan 5 is disposed between the vent 16 and the exchange port 361 close to it.

[0046] After exchanging heat with the evaporation section 311, the cooled air is blown into the first inner cavity 11 by the first fan 4 for cooling. The airflow drawn by the second fan 5 is blown into the heat exchange chamber 360 to dissipate heat from the condensation section 312. Since the evaporation section 311 is located in the second inner cavity 12, the ambient temperature in the second inner cavity 12 is relatively higher than that in the first inner cavity 11. Therefore, the first enclosure 33 surrounds the evaporation section 311, reducing the impact of heat from the second inner cavity 12 on the evaporation section 311, reducing temperature fluctuations, and thus improving the heat dissipation effect on the electrical component 2. In addition, the placement of the heat exchange assembly 3 in the second inner cavity 12 increases the flexibility of actual installation, making full use of the existing and available space inside the equipment and reducing interference with surrounding structural components.

[0047] Please see Figure 1 In some embodiments, the heat exchange assembly 3 further includes heat sinks 35, and the number of heat sinks 35 is set to multiple, with the heat sinks 35 disposed on the heat pipe 31. The heat sinks 35 increase the heat exchange surface area of ​​the heat pipe 31, thereby improving the heat exchange efficiency of the heat pipe 31.

[0048] Please see Figure 1 In some embodiments, the chassis 1 includes a first housing 17 and a second housing 18. The first housing 17 forms a first inner cavity 11, and the second housing 18 forms a second inner cavity 12 and is connected to the outer wall of the first housing 17. The first housing 17 is provided with a window structure 14, through which an opening 331 communicates with the corresponding inner cavity 10. Multiple exhaust vents 13 are provided, and are respectively located on two opposite outer sides of the second housing 18. The heat exchange assembly 3 can be connected to the housing it is located in, thereby fixing the heat exchange assembly 3.

[0049] Please see Figure 7In some embodiments, heat exchange components 3 can be respectively disposed in the first inner cavity 11 and the second inner cavity 12. In the heat exchange component 3 disposed in the first inner cavity 11, the evaporation section 311 is exposed in the first inner cavity 11, and the condensation section 312 is disposed in the air cavity 330. The opening 331 communicates with the second inner cavity 12 through the window structure 14. In the heat exchange component 3 disposed in the second inner cavity 12, the evaporation section 311 is housed in the air cavity 330, and the condensation section 312 is housed in the heat exchange cavity 360. A flow divider 34 is disposed in the air cavity 330, and the opening 331 corresponding to the evaporation section 311 communicates with the first inner cavity 11 through the window structure 14. The cooling effect on the electrical component 2 is enhanced by using two heat exchange components 3.

[0050] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0051] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0052] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A power conversion device, characterized in that, include: The chassis (1) has multiple cavities (10); A heat exchange assembly (3) is disposed in one of the inner cavities (10). The heat exchange assembly (3) includes a heat pipe (31), a substrate (32), and a first enclosure portion (33). The heat pipe (31) passes through the substrate (32), and the evaporation section (311) and the condensation section (312) of the heat pipe (31) are respectively located on both sides of the substrate (32) along a first direction (X). The first direction (X) corresponds to the thickness direction of the substrate (32). The first enclosure (33) is disposed on one side of the substrate (32) along the first direction (X) and forms an air cavity (330) and an opening (331) communicating with the air cavity (330) together with the substrate (32). One of the evaporation section (311) and the condensation section (312) is disposed in the air cavity (330). The opening (331) is connected to at least one other inner cavity (10).

2. The power conversion device according to claim 1, characterized in that, The power conversion device further includes a first fan (4), which is disposed in the inner cavity (10) connected to the opening (331) and is disposed opposite to the opening (331).

3. The power conversion device according to claim 2, characterized in that, The heat exchange assembly (3) further includes a flow divider (34), which is disposed in the air cavity (330) and connected to the first enclosure (33). The flow divider (34) divides the air cavity (330) into a first region (3303) and a second region (3304) and a connecting port (3305) connecting the first region (3303) and the second region (3304). The first region (3303) and the second region (3304) are arranged along the first direction (X). The connecting port (3305) is located on the side of the flow divider (34) away from the opening (331). One of the evaporation section (311) and the condensation section (312) is disposed in the first region (3303). In the second direction (Y), the first fan (4) is disposed opposite to the portion of the opening (331) corresponding to the first region (3303), or the first fan (4) is disposed opposite to the portion of the opening (331) corresponding to the second region (3304). The second direction (Y) intersects the first direction (X).

4. The power conversion device according to any one of claims 1-3, characterized in that, The heat exchange assembly (3) further includes a second enclosure (36), which is disposed on the side of the substrate (32) away from the first enclosure (33) and forms a heat exchange cavity (360) and an exchange port (361) communicating with the heat exchange cavity (360) together with the substrate (32). One of the evaporation section (311) and the condensation section (312) is disposed in the air cavity (330) and the other is disposed in the heat exchange cavity (360), and exchanges heat with the air in the inner cavity (10) through the exchange port (361).

5. The power conversion device according to claim 4, characterized in that, The number of exchange ports (361) is provided in multiples, and the multiple exchange ports (361) are respectively provided on both sides of the second enclosure part (36) along the second direction (Y).

6. The power conversion device according to claim 4, characterized in that, The power conversion device further includes a second fan (5), which is arranged opposite to the exchange port (361).

7. The power conversion device according to claim 1, characterized in that, The first direction (X) is parallel to the horizontal direction or the direction of gravity; The heat pipe (31) is arranged along the first direction (X), or the heat pipe (31) is arranged at an angle to the first direction (X), and the height of the condensing section (312) is higher than the height of the evaporating section (311).

8. The power conversion device according to claim 1, characterized in that, The power conversion device further includes an electrical component (2), which is disposed in the inner cavity (10).

9. The power conversion device according to claim 1, characterized in that, The chassis (1) is provided with an exhaust port (13), and the inner cavity (10) that exchanges heat with the condenser section (312) is connected to the exhaust port (13).

10. The power conversion device according to claim 1, characterized in that, The chassis (1) is provided with a vent (16), and the inner cavity (10) that exchanges heat with the condensing section (312) is connected to the vent (16), and the vent (16) is arranged opposite to the condensing section (312).

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