Power conversion equipment and heat dissipation unit

Abstract

The invention discloses a power conversion device and a heat dissipation unit, the heat dissipation unit comprises a heat dissipation device, the heat dissipation device comprises an evaporator and a condenser, the evaporator is provided with an evaporation cavity, the condenser is provided with a condensation cavity, and the evaporation cavity is communicated with the condensation cavity; the heat exchange device comprises a heat exchange pipe, a first air inlet and a first air outlet are formed in the two ends of the heat exchange pipe respectively, and at least part of the heat exchange pipe is configured to conduct heat exchange with a heat exchange working medium in the condenser. According to the scheme, part of the heat exchange pipe can exchange heat with the heat exchange working medium in the condenser, the heat dissipation effect of air in the heat exchange pipe can be improved, and the use requirement can be better met.

Description

Technical Field

[0001] This application relates to the field of power conversion equipment technology, specifically to a heat dissipation unit and a power conversion device. Background Technology

[0002] Power conversion equipment generates a significant amount of heat during normal operation, thus requiring a heat dissipation unit. However, current heat dissipation units generally have relatively poor cooling performance, making them insufficient for most applications.

[0003] Therefore, how to provide a solution to overcome or alleviate the above-mentioned defects remains a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In a first aspect, this application provides a heat dissipation unit, comprising: a heat dissipation device, the heat dissipation device including an evaporator and a condenser, the evaporator having an evaporation chamber, the condenser having a condensation chamber, the evaporation chamber and the condensation chamber being connected; and a heat exchange device, the heat exchange device including a heat exchange tube, the two ends of the heat exchange tube forming a first air inlet and a first air outlet respectively, at least a portion of the heat exchange tube being configured to exchange heat with a heat exchange working fluid in the condenser.

[0005] In the above scheme, heat exchange can occur between the heat dissipation device and the heat exchange device. Specifically, at least part of the heat exchange tube can be in contact with the heat exchange medium in the condenser for heat exchange, so that heat exchange can occur between the heat exchange tube and the heat exchange medium. The heat exchange tube can use the existing heat exchange medium in the condenser for liquid cooling, which can greatly improve the heat dissipation effect of the air in the heat exchange tube, so as to better meet the requirements of use.

[0006] In some embodiments, the condenser includes a first manifold and a plurality of condenser tubes. The first manifold has a first manifold cavity. Each of the condenser tubes is arranged along a first direction. One end of each condenser tube is connected to the evaporation cavity, and the other end of each condenser tube is connected to the first manifold cavity. At least a portion of each heat exchange tube is located in the first manifold cavity and exchanges heat with the heat exchange medium in the first manifold cavity.

[0007] In some embodiments, the heat exchange tube includes a first tube segment extending along a first direction; the first manifold includes two first end plates disposed opposite each other along the first direction, the first end plates being provided with a first connection port, and the first tube segment being sealed and inserted into the first connection port.

[0008] In some embodiments, the first air inlet and the first air outlet are located on opposite sides of the evaporator along the first direction.

[0009] In some embodiments, the heat exchange tube includes a first tube segment extending along a second direction, the second direction forming an angle with the first direction; the first manifold includes a second end plate disposed at an angle with the second direction, the second end plate being provided with a second connection port, and the first tube segment being sealed and inserted into the second connection port.

[0010] In some embodiments, there are two second end plates, which are arranged opposite to each other along the second direction, and the first pipe segment is sealed and inserted into the two second end plates.

[0011] In some embodiments, the first manifold component further includes a manifold base plate connected to the condenser tube, the manifold base plate being provided with a third connection port, and the heat exchange tube further including a pipe section sealed and inserted into the third connection port.

[0012] In some embodiments, the first air inlet and the first air outlet are located on the same side of the evaporator along the first direction.

[0013] In some embodiments, the number of condensers is at least two, and each condenser is arranged at intervals along the second direction, with the first pipe segment inserted into the first manifold of each condenser.

[0014] In some embodiments, the heat exchange tube further includes a second tube segment and a third tube segment, one end of the second tube segment being connected to the first tube segment, the other end of the second tube segment forming the first air inlet, one end of the third tube segment being connected to the first tube segment, and the other end of the third tube segment forming the first air outlet.

[0015] In some embodiments, the heat exchange device further includes a first adapter, wherein the first pipe segment and the second pipe segment are both connected to the first adapter, and the first pipe segment and the second pipe segment are connected through the first adapter; and / or, the heat exchange device further includes a second adapter, wherein the third pipe segment and the first pipe segment are both connected to the second adapter, and the third pipe segment and the first pipe segment are connected through the second adapter.

[0016] In some embodiments, the condenser includes a first manifold and a plurality of condenser tubes. The first manifold has a first manifold cavity. Each of the condenser tubes is arranged along a first direction. One end of each condenser tube is connected to the evaporation cavity, and the other end of each condenser tube is connected to the first manifold cavity. A heat exchange tube is sealed and inserted into at least a portion of the condenser tubes and contacts the heat exchange medium inside the condenser tubes for heat exchange. The heat exchange tube includes a first tube segment extending along the first direction. The condenser tube is provided with a through hole extending along the first direction, and the first tube segment is sealed and inserted into the through hole.

[0017] In some embodiments, the condenser includes a first manifold, a second manifold, and a plurality of condenser tubes; the first manifold has a first manifold cavity, and the second manifold has a second manifold cavity; each of the condenser tubes is arranged along a first direction, one end of each condenser tube is connected to the first manifold cavity, and the other end of each condenser tube is connected to the second manifold cavity, the second manifold cavity is also connected to the evaporation cavity, and at least a portion of each heat exchange tube is located in the second manifold cavity and contacts the heat exchange medium in the second manifold cavity for heat exchange.

[0018] In some embodiments, the heat exchange tube is located outside the condenser, and at least a portion of the heat exchange tube is in contact with the outer wall surface of the condenser.

[0019] In some embodiments, the condenser includes a first manifold and a plurality of condenser tubes, the first manifold having a first manifold cavity, each of the condenser tubes being arranged along a first direction, one end of each condenser tube being connected to the evaporation cavity, and the other end of each condenser tube being connected to the first manifold cavity; at least a portion of the heat exchange tubes are in contact with the outer wall surface of the first manifold; and / or, at least a portion of the heat exchange tubes are in contact with the outer wall surface of the condenser tubes.

[0020] In some embodiments, the heat dissipation unit further includes a base frame, the evaporator is mounted on the base frame, the base frame is provided with an installation opening, and the first air inlet and the first air outlet are both connected to the installation opening.

[0021] In some embodiments, the base frame includes a frame and a mounting plate located on the frame, the mounting opening is provided on the mounting plate, and the evaporator is connected to the mounting plate.

[0022] Secondly, this application also provides a power conversion device, including a chassis, a heating unit, and a heat dissipation unit; a partition is provided inside the chassis, the partition dividing the chassis into a first chamber and a second chamber that are isolated from each other; the heating unit includes a first heating device, the first heating device being located in the first chamber; the heat dissipation unit is the heat dissipation unit involved in the first aspect or any of the embodiments of the first aspect, the heat dissipation unit is installed on the partition, the evaporator and the first heating device are in thermally conductive contact, the condenser and the heat exchange tube are both located in the second chamber, and the first air inlet and the first air outlet are both connected to the first chamber.

[0023] In some embodiments, the partition is provided with an air inlet window and an air outlet window, the first air inlet is connected to the air outlet window, and the first air outlet is connected to the air inlet window.

[0024] In some embodiments, the partition extends along the height direction of the chassis, the chassis including a top plate and a bottom plate, and the shortest distance in the height direction between the air outlet and the bottom plate is greater than the shortest distance in the height direction between the air outlet and the top plate.

[0025] In some embodiments, the partition extends along the height direction of the chassis, the air inlet window and the air outlet window are arranged along a first direction, the first direction is perpendicular to the normal of the partition, and the first direction forms an angle with the height direction; the heating unit further includes a circuit board and a second heating device, the first heating device and the second heating device are respectively located on both sides of the normal of the circuit board; the projection of the second heating device along the first direction and the projection of the air inlet window along the first direction overlap at least partially; and / or, the projection of the second heating device along the first direction and the projection of the air outlet window along the first direction overlap at least partially.

[0026] In some embodiments, the partition extends along the height direction of the chassis, and the air inlet window and the air outlet window are arranged along the height direction of the chassis; the projection of the line connecting the highest point of the upper one of the air inlet window and the lowest point of the lower one of the air inlet window and the air outlet window along the first direction is a first projection; the projection of the heating unit along the first direction is a second projection, and the first projection and the second projection at least partially overlap.

[0027] In some embodiments, the power conversion device further includes an air collecting shroud having a first opening and a second opening, the first opening being connected to the air inlet window or the air outlet window, and the second opening being oriented toward at least a portion of the heating unit.

[0028] In some embodiments, the power conversion device further includes a first fan, which is installed at the second opening.

[0029] In some embodiments, the power conversion device further includes a second fan disposed in the second chamber, and the number of condensers is at least two, with each condenser arranged at intervals, and the second fan located between two adjacent condensers.

[0030] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a power conversion device according to an embodiment of this application; Figure 2 for Figure 1An end view showing the chassis and heating unit; Figure 3 This is a schematic diagram of the adjusted second air inlet of the power conversion device. Figure 4 This is a schematic diagram of the structure of the first heat dissipation unit in the embodiments of this application; Figure 5 for Figure 4 A structural diagram from another perspective; Figure 6 for Figure 4 A schematic diagram of a cross-section perpendicular to the second direction; Figure 7 for Figure 4 A schematic diagram of the decomposition process; Figure 8 A schematic diagram of a heat exchange unit equipped with a reflux pipe; Figure 9 This is a schematic diagram of the base frame structure; Figure 10 For installation Figure 4 A schematic diagram of the power conversion device of the heat dissipation unit. The chassis has been partially removed to show the internal structure of the second chamber. Figure 11 For installation Figure 4 A cross-sectional view of the power conversion device of the heat dissipation unit perpendicular to the first direction; Figure 12 For installation Figure 4 A schematic diagram of the internal structure of the first chamber of the power conversion device in the heat dissipation unit; Figure 13 For installation Figure 4 A cross-sectional view of the power conversion device of the heat dissipation unit perpendicular to the second direction, omitting the condenser tube and condenser; Figure 14 A schematic diagram of a distribution structure for air intake windows, air exhaust windows, and heat dissipation windows; Figure 15 This is a schematic diagram of a power conversion device with two condensers for heat dissipation. The chassis has been partially removed in the diagram to show the internal structure of the second chamber. Figure 16 for Figure 15 A cross-sectional view perpendicular to the first direction; Figure 17 for Figure 15 A schematic diagram of a modified design; Figure 18 for Figure 15 A structural diagram from another perspective, in which the chassis has been partially removed to illustrate the internal structure of the first chamber; Figure 19 for Figure 18 A schematic diagram of the structure after the first and second air collection hoods are installed; Figure 20 for Figure 4 A schematic diagram of a modified design; Figure 21 for Figure 20 A cross-sectional view perpendicular to the first direction; Figure 22 This is a schematic diagram of the structure of the second type of heat dissipation unit in the embodiments of this application; Figure 23 for Figure 22 A schematic diagram of a cross-section perpendicular to the second direction; Figure 24 For installation Figure 22 A schematic diagram of the power conversion device of the heat dissipation unit. The chassis has been partially removed to show the internal structure of the second chamber. Figure 25 This is a schematic diagram of the structure of the third type of heat dissipation unit in the embodiments of this application; Figure 26 for Figure 25 A structural diagram from another perspective; Figure 27 for Figure 25 A cross-sectional view perpendicular to the first direction; Figure 28 For installation Figure 25 A schematic diagram of the power conversion device of the heat dissipation unit. The chassis has been partially removed to show the internal structure of the second chamber. Figure 29 For installation Figure 25 A projection view of the first chamber of the power conversion device of the heat dissipation unit along a third direction; Figure 30 This is a schematic diagram of a power conversion device that shares a heat exchange unit with two first busbar components. The chassis has been partially removed in the diagram to show the internal structure of the second chamber. Figure 31 for Figure 30 A cross-sectional view perpendicular to the first direction; Figure 32 for Figure 30 Schematic diagram of the internal structure of the first chamber; Figure 33 This is a schematic diagram of the structure of the fourth type of heat dissipation unit in the embodiments of this application; Figure 34 This is a schematic diagram of the structure of the fifth type of heat dissipation unit in the embodiments of this application; Figure 35 for Figure 34A cross-sectional view perpendicular to the second direction; Figure 36 This is a structural diagram of the sixth implementation method in the embodiments of this application; Figure 37 The figure shows a structural schematic diagram of the seventh implementation method in the embodiments of this application.

[0032] The annotations in the attached figures are explained as follows: 100A power conversion equipment; 100A fan cover; 1000 Chassis; 1100 First Chamber; 1110 Top Panel; 1120 Bottom Panel; 1200 Second Chamber; 1300 Partition; 1310 Air Inlet Window; 1320 Air Outlet Window; 1330 Heat Dissipation Window; 1400 Second Air Inlet; 1500 Second Air Outlet; 2000 Heating unit; 2100 First heating element; 2200 Circuit board; 2300 Second heating element; 2400 Magnetic element; 3000 Heat dissipation unit; 3100 Heat dissipation device; 3110 Evaporator; 3111 Evaporation chamber; 3120 Condenser; 3120A Condensation chamber; 3121 First manifold component; 3121A First manifold chamber; 3121B First end plate; 3121B1 First connection port; 3121C Second end plate; 3121C1 Second connection port; 3121D Manifold base plate; 3121D1 Pipe interface; 3121D2 Third connection port; 3122 Condenser tube; 3122A Connecting pipe; 3122B Through hole; 3123 Second manifold component; 3123A Second manifold chamber; 3123B Third end plate; 3123B1 Fourth connection port; 3124 Return pipe; 3200 Heat exchanger; 3210 Heat exchange tube; 3210A First air inlet; 3210B First air outlet; 3211 First pipe section; 3212 Second pipe section; 3213 Third pipe section; 3220 First adapter component; 3221 First adapter cavity; 3222 First adapter base plate; 3222A First adapter interface; 3230 Second adapter component; 3231 Second adapter cavity; 3232 Second adapter base plate; 3232A Second adapter interface; 3300 Base frame; 3310 Frame; 3320 Mounting plate; 3321 Mounting opening; 3330 Air inlet channel; 3340 Air outlet channel; 4000 First Wind Turbine; 5000 Episode 1 Windshield; 6000 Episode 2 Windshield; 7000 heat sink fins; 8000 Second Fan. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] In the description of the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature.

[0035] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, "linking" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0036] The directional terms mentioned in the embodiments of this application, such as "inner" and "outer", are only for reference to the direction of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0037] In the description of embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0038] In the description of the embodiments in this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0039] Please refer to Figures 1-3 , Figure 1 This is a schematic diagram of the structure of a power conversion device according to an embodiment of this application; Figure 2 for Figure 1 An end view showing the chassis and heating unit; Figure 3 This is a schematic diagram of the adjusted second air inlet of the power conversion device.

[0040] like Figures 1-3As shown, this application embodiment provides a power conversion device 100, which may be, for example, a converter, an inverter, a motor controller, etc., and includes a chassis 1000 and a heating unit 2000.

[0041] The chassis 1000 is the external structure of the power conversion device 100. Within the power conversion device 100, components such as the heating unit 2000 can be directly or indirectly mounted within the chassis 1000 for integrated assembly. Furthermore, the chassis 1000 protects the heating unit 2000 from external moisture, dust, and other contaminants. The chassis 1000 also largely determines the external shape of the power conversion device 100. In this embodiment, the external shape of the chassis 1000 is not explicitly limited. In practical applications, those skilled in the art can choose the shape according to specific needs, as long as it meets the requirements. For example, the chassis 1000 can be a hexahedron, such as a cuboid.

[0042] The chassis 1000 is provided with a partition 1300, which divides the chassis 1000 into a first chamber 1100 and a second chamber 1200 that are isolated from each other.

[0043] The first chamber 1100 is a sealed chamber, not directly connected to the outside, to provide relatively high waterproof and dustproof performance. The second chamber 1200 is a heat dissipation chamber. In the chassis 1000, the wall forming the second chamber 1200 is provided with a second air inlet 1400 and a second air outlet 1500. Outside air can enter the second chamber 1200 through the second air inlet 1400, and the air in the second chamber 1200 can be discharged from the second chamber 1200 through the second air outlet 1500. In this way, air convection can be formed within the second chamber 1200 to better dissipate heat from the components inside the second chamber 1200.

[0044] The heating unit 2000 may include a first heating device 2100, a circuit board 2200, and a second heating device 2300.

[0045] The first heating element 2100, the circuit board 2200, and the second heating element 2300 can all be disposed within the first chamber 1100 to achieve a relatively good protective effect. Both the first heating element 2100 and the second heating element 2300 can be mounted on the circuit board 2200 for integrated configuration; furthermore, the first heating element 2100 and the second heating element 2300 can be located on opposite sides of the circuit board 2200. The heat generated by the first heating element 2100 is greater than that of the second heating element 2300; for example, the first heating element 2100 can be a high-power device such as an Insulated-Gate Bipolar Transistor (IGBT), while the second heating element 2300 can be a capacitor, inductor, resistor, etc.

[0046] For ease of description, embodiments of this application can define a first direction X, a second direction Y, and a third direction Z. The third direction Z is the normal direction of the partition 1300, that is, the direction in which the first chamber 1100 and the second chamber 1200 are spaced apart. Both the first direction X and the second direction Y can be perpendicular to the second direction Z, and the first direction X and the second direction Y can form an angle, such as 90 degrees. In some scenarios, combined with... Figure 1 The second direction Y can be the height direction of the chassis 1000, that is, the second direction Y can be the up and down direction.

[0047] In some implementations, such as Figure 2 As shown, the second air inlet 1400 and the second air outlet 1500 can be respectively disposed on two opposite walls of the chassis 1000 along the second direction Y. Alternatively, in some other implementations, such as Figure 3 As shown, the second air inlet 1400 can be disposed on the wall of the chassis 1000 opposite to the partition 1300, while the second air outlet 1500 can be disposed on two opposite walls of the chassis 1000 along the second direction Y. That is to say, the embodiments of this application do not actually limit the placement of the second air inlet 1400 and the second air outlet 1500. In practical applications, those skilled in the art can select them according to specific needs, as long as the requirements of use are met.

[0048] Please refer to Figures 4-14 , Figure 4 This is a schematic diagram of the structure of the first heat dissipation unit in the embodiments of this application; Figure 5 for Figure 4 A structural diagram from another perspective; Figure 6 for Figure 4 A schematic diagram of a cross-section perpendicular to the second direction; Figure 7 for Figure 4 A schematic diagram of the decomposition process; Figure 8A schematic diagram of a heat exchange unit equipped with a reflux pipe; Figure 9 This is a schematic diagram of the base frame structure; Figure 10 For installation Figure 4 A schematic diagram of the power conversion device of the heat dissipation unit. The chassis has been partially removed to show the internal structure of the second chamber. Figure 11 For installation Figure 4 A cross-sectional view of the power conversion device of the heat dissipation unit perpendicular to the first direction; Figure 12 For installation Figure 4 A schematic diagram of the internal structure of the first chamber of the power conversion device in the heat dissipation unit; Figure 13 For installation Figure 4 A cross-sectional view of the power conversion device of the heat dissipation unit perpendicular to the second direction, omitting the condenser tube and condenser; Figure 13 for Figure 12 A partially enlarged schematic diagram, with the addition of a drainage tube; Figure 14 A schematic diagram of a distribution structure for air intake windows, air exhaust windows, and heat dissipation windows.

[0049] like Figures 4-7 As shown in the figure, this application embodiment also provides a heat dissipation unit 3000, which includes a heat dissipation device 3100 and a heat exchange device 3200.

[0050] The heat dissipation device 3100 includes an evaporator 3110 and a condenser 3120. The evaporator 3110 has an evaporation chamber 3111, and the condenser 3120 has a condensation chamber 3120A. The evaporation chamber 3111 and the condensation chamber 3120A are connected. Figure 11 and Figure 13 The condenser 3120 is located in the second chamber 1200, and the evaporator 3110 and the first heating element 2100 are in thermal contact.

[0051] The heat dissipation device 3100 is also filled with a heat exchange medium, which can be, for example, water or fluoride. This heat exchange medium can be a two-phase medium, including a gaseous medium and a liquid medium. In the evaporation chamber 3111, the heat exchange medium is primarily a liquid medium. During the operation of the power conversion device 100, the heat generated by the first heating element 2100 can be conducted to the evaporator 3110, causing the liquid working medium in the evaporation chamber 3111 to undergo a phase change to form a gaseous working medium. The gaseous working medium can enter the condensation chamber 3120A of the condenser 3120 and can be condensed and liquefied in the condenser 3120 to reform the liquid working medium, which can then flow back into the evaporation chamber 3111. Thus, through the two-phase change of the heat exchange working medium and the transfer of the heat exchange working medium between the evaporator 3110 and the condenser 3120, the evaporative cooling of the first heating element 2100 can be achieved, thereby enabling better temperature control of the first heating element 2100.

[0052] The heat exchange device 3200 includes a heat exchange tube 3210, the interior of which forms a heat dissipation air duct. A first air inlet 3210A and a first air outlet 3210B are formed at both ends of the heat exchange tube 3210, respectively. Figure 11 and Figure 13 The heat exchange tube 3210 is located in the second chamber 1200, and both the first air inlet 3210A and the second air inlet 3210B are connected to the first chamber 1100. During operation, the relatively warm air in the first chamber 1100 flows into the heat dissipation duct of the heat exchange tube 3210 through the first air inlet 3210A. The relatively cool air formed after heat dissipation within the heat exchange tube 3210 can then flow back into the first chamber 1100 through the first air outlet 3210B, thereby achieving cooling of the components inside the first chamber 1100. In other words, the heat exchange air provided by the heat exchange device 3200 can cool both the first heating element 2100 and the second heating element 2300.

[0053] More importantly, at least a portion of the heat exchange tubes 3210 can be in close contact with the heat exchange medium inside the condenser 3120 for heat exchange, allowing heat exchange between the heat exchange tubes 3210 and the heat exchange medium. This results in relatively better heat dissipation for the air inside the heat exchange tubes 3210. In other words, in this embodiment, the air inside the heat exchange device 3200 can undergo two heat exchange methods: first, heat exchange via air convection within the second chamber 1200; and second, heat exchange via contact with the heat exchange medium inside the condenser 3120, which yields even better heat exchange results.

[0054] In some implementations, such as Figure 6As shown, the condenser 3120 may include a first manifold 3121 and a plurality of condenser tubes 3122.

[0055] The first manifold 3121 and the evaporator 3110 are spaced apart along a third direction Z. The first manifold 3121 has a first manifold cavity 3121A. The wall plate of the first manifold 3121 facing the evaporator 3110 is a manifold base plate 3121D, and the manifold base plate 3121D is provided with a pipe interface 3121D1. Each condenser tube 3122 extends along a third direction Z, and the condenser tubes 3122 are arranged at intervals along a first direction X. A connecting pipe 3122A is provided inside the condenser tube 3122. The number of connecting pipes 3122A can be one or more, which is not limited here. One end of the condenser tube 3122 is connected to the evaporator cavity 3111; the other end of the condenser tube 3122 is connected to the pipe interface 3121D1 to connect to the first manifold cavity 3121A.

[0056] In practical operation, the liquid working fluid in the evaporator 3110 absorbs heat and evaporates to form a gaseous working fluid. The gaseous working fluid can enter the connecting pipe 3122B of the condenser 3122, and then enter the condensation chamber 3120A of the condenser 3120. During this process, the gaseous working fluid can condense and liquefy to form a liquid working fluid. The condensation and liquefaction can occur in the condenser 3122 or in the first manifold 3121. Afterward, the formed liquid working fluid can flow back to the evaporator 3111 through the condenser 3122 to complete the circulation of the heat exchange working fluid. Alternatively, in some other implementations of this application, such as... Figure 8 As shown, the condenser 3100 may also include a return pipe 3124, which may connect the first manifold 3121 and the evaporator 3110. The liquid working fluid formed by condensation and liquefaction in the first manifold 3121 may also be returned to the evaporation chamber 3111 through the return pipe 3130 to realize the circulation of the heat exchange working fluid.

[0057] In some schemes, such as Figure 7 As shown, heat dissipation fins 7000 can also be provided on the outer side of the condenser tube 3122 to increase the heat exchange area and improve the condensation heat exchange efficiency. Here, the embodiments of this application do not limit the specific structural form and installation method of the heat dissipation fins 7000. In practical applications, those skilled in the art can select according to specific needs, as long as the requirements of use can be met; for example, the heat dissipation fins 7000 can be installed and fixed by welding or other methods.

[0058] Furthermore, at least a portion of the heat exchange tube 3210 may be located within the first manifold cavity 3121A of the first manifold component 3121, allowing the heat exchange tube 3210 and the heat exchange medium within the first manifold cavity 3121A to come into contact, enabling direct contact and heat exchange between the heat exchange tube 3210 and the heat exchange medium. With this configuration, the only barrier between the air within the heat exchange tube 3210 and the heat exchange medium is the tube wall of the heat exchange tube 3210, resulting in relatively low thermal resistance and improved heat exchange performance.

[0059] Furthermore, by housing at least a portion of the heat exchange tube 3210 within the first busbar component 3121, the heat exchange device 3200 and the condenser 3120 can be integrated, thereby improving the structural compactness and integration of the heat dissipation unit 3000. Moreover, since at least a portion of the heat exchange tube 3210 is located within the first busbar component 3121, the space occupied by the heat dissipation unit 3000 can be reduced, allowing for a relatively smaller volume and consequently, a smaller installation space requirement. Thus, without changing the size of the power conversion device 100, the reduction in the installation space required for the heat dissipation unit 3000 means that there can be more spare space inside the power conversion device 100 to install other devices, such as power devices, which is also beneficial to improving the power density of the power conversion device 100. Furthermore, without changing the number of components inside the power conversion device 100 and with the gaps between the components remaining basically unchanged, the reduction in the installation space required for the heat dissipation unit 3000 also means that the size of the power conversion device 100 can be reduced, which will help to achieve the miniaturization design of the power conversion device 100.

[0060] Specifically, the heat exchange tube 3210 may include a first tube segment 3211 extending along the first direction X. (In conjunction with...) Figure 6 The first busbar component 3121 may include two first end plates 3121B arranged opposite to each other along the first direction X. The first end plates 3121B may be provided with first connection ports 3121B1. The two ends of the first pipe segment 3211 are respectively sealed and inserted into the first connection ports 3121B1 of the two first end plates 3121B to realize the installation and fixation of the first pipe segment 3211 in the first busbar component 3121.

[0061] The number of first pipe segments 3211 can be one. Alternatively, the number of first pipe segments 3211 can also be multiple. In this case, the first pipe segments 3211 can be arranged at intervals, for example, they can be arranged at intervals along a third direction Z. There can be one flow pipe or multiple flow pipes in the first pipe segment 3211, which is not limited here.

[0062] Here, the embodiments of this application do not limit the sealing insertion method between the first pipe segment 3211 and the first end plate 3121B. In practical applications, those skilled in the art can configure it according to specific needs, as long as it meets the requirements of use. For example, the first pipe segment 3211 and the first end plate 3121B can be fixed by welding or bonding, so as to achieve a seal by filling with solder or adhesive. As another example, the first pipe segment 3211 and the first end plate 3121B can also be sealed by adding a sealing ring.

[0063] In some implementations, such as Figure 4 , Figure 6 and Figure 7 As shown, the heat exchange tube 3210 may also include a second tube section 3212 and a third tube section 3213, both of which may extend along a third direction Z.

[0064] The second pipe segment 3212 and the third pipe segment 3213 are located on both sides of the first pipe segment 3211 along the first direction X. One end of the second pipe segment 3212 can be connected to one end of the first pipe segment 3211, and the other end of the second pipe segment 3212 can form a first air inlet 3210A; one end of the third pipe segment 3213 can be connected to one end of the first pipe segment 3211, and the other end of the third pipe segment 3213 can form a first air outlet 3210B.

[0065] Both the second pipe section 3212 and the third pipe section 3213 can be located outside the first manifold 3121 for heat exchange via air convection. The number of both the second pipe section 3212 and the third pipe section 3213 can be one, or at least one of them can be multiple; this is not limited here. Furthermore, the number of flow pipes installed inside both the second pipe section 3212 and the third pipe section 3213 can be one, or at least one of them can be multiple; this is also not limited here. It should be understood that when multiple flow pipes are installed inside the second pipe section 3212, the number of first air inlets 3210A configured in one second pipe section 3212 can also be multiple; similarly, when multiple flow pipes are installed inside the third pipe section 3213, the number of first air outlets 3210B configured in one third pipe section 3213 can also be multiple.

[0066] In practical applications, at least one of the second pipe section 3212 and the third pipe section 3213 may also be provided with heat dissipation fins 7000 on its outer wall surface to increase the heat exchange area and improve the heat exchange effect. The structure, quantity and installation method of the heat dissipation fins 7000 are not limited here.

[0067] In some designs, the second pipe section 3212 and the third pipe section 3213 can be directly connected to the first pipe section 3211. This design will be explained in detail later.

[0068] In other schemes, the second pipe segment 3212 and the third pipe segment 3213 may also be indirectly connected to the first pipe segment 3211.

[0069] like Figures 4-7 As shown, the heat exchange device 3200 may further include a first transition component 3220 and a second transition component 3230. The first transition component 3220 and the second transition component 3230 may be located on opposite sides of the first manifold 3121 along the first direction X. The first transition component 3220 has a first transition cavity 3221, and the second transition component 3230 has a second transition cavity 3231. Both the first pipe segment 3211 and the second pipe segment 3212 can communicate with the first transition cavity 3221 for indirect connection. Both the first pipe segment 3211 and the third pipe segment 3213 can communicate with the second transition cavity 3231 for indirect connection.

[0070] In the above scheme, the first pipe section 3211 is indirectly connected to the second pipe section 3212 via the first adapter 3220, and the first pipe section 3211 is indirectly connected to the third pipe section 3213 via the second adapter 3230. This reduces pipe bends, allowing all three pipe sections (3211, 3212, and 3213) to be straight pipes, facilitating fabrication and reducing potential leakage risks at bends. Furthermore, the adapters 3220 and 3230 provide better flexibility in adapting to mismatches in quantity, size, or model among the three pipe sections, allowing for greater design and installation flexibility.

[0071] Combination Figure 7The first adapter component 3220 has a wall panel facing the evaporator 3110 that serves as a first adapter base plate 3222. The first adapter base plate 3222 is provided with a first adapter interface 3222A. The second pipe segment 3212 is connected to this first adapter interface 3222A to achieve conductivity between the second pipe segment 3212 and the first adapter cavity 3221. The second adapter component 3230 has a wall panel facing the evaporator 3110 that serves as a second adapter base plate 3232. The second adapter base plate 3232 is provided with a second adapter interface 3232A. The third pipe segment 3213 is connected to this second adapter interface 3232A to achieve conductivity between the third pipe segment 3213 and the second adapter cavity 3231. Here, this embodiment does not limit the connection method between the second pipe segment 3212 and the first adapter base plate 3222, nor the connection method between the third pipe segment 3213 and the second adapter base plate 3232. In practical applications, those skilled in the art can select the appropriate method according to actual needs. For example, the connection method can be welding, bonding, etc., to ensure sealing while connecting. Another example is flange connection, in which case sealing rings can be added to guarantee the sealing performance at the connection point.

[0072] In specific manufacturing, at least one of the first adapter component 3220 and the second adapter component 3230 and the first busbar component 3121 can be an integral structure to facilitate processing and fabrication. Taking the integral structure of the first adapter component 3220 and the first busbar component 3121 as an example, in this case, the first busbar cavity 3121A and the first adapter cavity 3221 are different chambers within the same shell-shaped component. The first adapter component 3220 and the first busbar component 3121 can share a first end plate 3121B, which can separate the first busbar cavity 3121A and the first adapter cavity 3221.

[0073] Alternatively, at least one of the first adapter component 3220 and the second adapter component 3230, along with the first busbar component 3121, can be fabricated separately and then assembled using welding, screw connections, or other connection methods. Taking the separate fabrication of the first adapter component 3220 and the first busbar component 3121 as an example, the wall plate of the first adapter component 3220 facing the first busbar component 3121 along the first direction X can be provided with a connection hole for the first pipe section 3211 to pass through and connect with the first adapter cavity 3221.

[0074] It should be understood that in some other implementations of the embodiments of this application, only one of the first adapter component 3220 and the second adapter component 3230 may be provided. For example, only the first adapter component 3220 may be provided, in which case the first pipe segment 3211 and the third pipe segment 3213 may be directly connected; in some solutions, the first pipe segment 3211 and the third pipe segment 3213 may be different segments of the same pipe, that is, the first pipe segment 3211 and the third pipe segment 3213 may be an integrally formed structure, and the first pipe segment 3211 and the third pipe segment 3213 may be combined to form a bent pipe; in other solutions, the first pipe segment 3211 and the third pipe segment 3213 may also be prepared separately, and then connected by welding, joint connection or other connection methods. For example, only the second adapter component 3230 can be provided. In this case, the second pipe segment 3212 and the first pipe segment 3211 can be directly connected. In some solutions, the second pipe segment 3212 and the first pipe segment 3211 can be different segments of the same pipe, that is, the second pipe segment 3212 and the first pipe segment 3211 can be an integrally formed structure, and the first pipe segment 3211 and the second pipe segment 3212 can be combined to form a bent pipe. In other solutions, the second pipe segment 3212 and the first pipe segment 3211 can also be prepared separately and then connected by welding, joint connection or other connection methods.

[0075] In some implementations, the first air inlet 3210A and the first air outlet 3210B may be located on both sides of the evaporator 3110 along the first direction X, and correspondingly, the second pipe section 3212 and the third pipe section 3213 may also be located on both sides of the evaporator 3110 along the first direction X, so as to adapt to the structural arrangement of the first pipe section 3211 passing through the first manifold 3121 along the first direction X.

[0076] In addition, in some other implementations of the embodiments of this application, the first air inlet 3210A and the first air outlet 3210B may have other positional relationships. For example, the first air inlet 3210A and the first air outlet 3210B may be respectively disposed on both sides of the evaporator 3110 along the second direction Y. In this case, the second pipe segment 3212 and the third pipe segment 3213 may also be respectively located on both sides of the evaporator 3110 along the second direction Y, and the first pipe segment 3211 may pass through the first manifold 3121 along the second direction Y. As another example, of the first air inlet 3210A and the first air outlet 3210B, one may be located on one side of the evaporator 3110 along the first direction X, and the other may be located on one side of the evaporator 3110 along the second direction Y.

[0077] In some implementations, such as Figure 4 , Figure 7 and Figure 9As shown, the heat dissipation unit 3000 may also include a base frame 3300. The evaporator 3110 can be mounted on the base frame 3300, and the specific mounting method may be, for example, welding.

[0078] Furthermore, the base frame 3300 is provided with an installation opening 3321, and the aforementioned first air inlet 3210A and first air outlet 3210B can be connected to the installation opening 3321. That is, the second pipe section 3212 and the third pipe section 3213 can be connected to the installation opening 3321. The specific connection method can also be welding, etc.

[0079] With this configuration, both the heat dissipation device 3100 and the heat exchange device 3200 are connected to the base frame 3300 for integrated assembly, which greatly improves the structural compactness and integration of the heat dissipation unit 3000. Furthermore, the base frame 3300 increases the structural connection between the heat dissipation device 3100 and the heat exchange device 3200, thereby increasing the mechanical properties and structural stability of the heat dissipation unit 3000 and reducing the possibility of damage during installation and use. In addition, the base frame 3300 also improves the ease of installation of the heat dissipation unit 3000; during installation, the base frame 3300 and the partition plate 1300 can be directly connected, making the connection operation more convenient and easier to implement.

[0080] Detailed explanation, such as Figure 9 As shown, the base frame 3300 may include a frame 3310 and a mounting plate 3320 located on the frame 3310. The mounting plate 3320 may be provided with the aforementioned mounting opening 3321. This mounting opening 3321 can be used not only to connect to the second pipe section 3212 and the third pipe section 3213, but also to connect to the condenser pipe 3122. Specific connection methods may include welding, bonding, flange connection, etc., which are not limited here. The evaporator 3110 is connected to the mounting plate 3320, and the evaporation chamber 3110 can communicate with a portion of the mounting openings 3321 to connect with the condenser pipes 3122 connected to these mounting openings 3321.

[0081] like Figure 6 As shown, the base frame 3300 can be equipped with an air inlet channel 3330 and an air outlet channel 3340.

[0082] The air inlet duct 3330 can be connected to the first air inlet 3210A of each second pipe section 3212, and can be used to distribute air within the first chamber 1100 to different first air inlets 3210A. The air outlet duct 3340 can be connected to the first air outlet 3210B of each third pipe section 3213, and can be used to collect the air discharged from each first air outlet 3210B before sending it into the first chamber 1100. Figure 6In this embodiment, the air inlet channel 3330 and the air outlet channel 3340 can be located on both sides of the evaporator 3110 along the first direction X, respectively, to accommodate the connection of the second pipe section 3212 and the third pipe section 3213. In addition, in some other implementations of this application, the air inlet channel 3330 and the air outlet channel 3340 can also be located in other positions, which will be explained in subsequent related descriptions.

[0083] It should be understood that in some other implementations of the embodiments of this application, the base frame 3300 may not be provided. In this case, the second pipe section 3212, the third pipe section 3213 and the evaporator 3110 may all be directly connected to the partition plate 1300.

[0084] In some implementations, such as Figure 12 and Figure 14 As shown, the partition 1300 may also be provided with an air inlet window 1310, an air outlet window 1320, and a heat dissipation window 1330.

[0085] The air outlet vent 1320 is connected to the first air inlet 3210A, allowing air in the first chamber 1100 to flow into the heat exchange tube 3210 for heat exchange. The air inlet vent 1310 is connected to the first air outlet 3210B, allowing air in the heat exchange tube 3210 to flow into the first chamber 1100 through the first air outlet 3210B and the air inlet vent 1310, so that the relatively cooler air obtained after heat exchange can flow back into the first chamber 1100.

[0086] The evaporator 3110 can seal the heat dissipation window 1330. Through this heat dissipation window 1330, the evaporator 3110 and the first heating element 2100 can directly contact each other. Alternatively, a thermal interface material (TIM) can be provided between the evaporator 3110 and the first heating element 2100, allowing them to indirectly contact each other through the TIM. In short, there is no need for a partition 1300 between the evaporator 3110 and the first heating element 2100, which can significantly reduce the contact thermal resistance between them and improve the heat exchange efficiency.

[0087] At least one of the aforementioned air outlet window 1320 and air inlet window 1310 can be connected to the heat dissipation window 1330. This allows for a relatively smaller number of windows to be installed on the partition 1300. For example, if the air outlet window 1320, air inlet window 1310, and heat dissipation window 1330 are all connected, see [reference needed]. Figure 14At this time, the partition 1300 only needs to be set with one window. The evaporator 3110 can partially block the window. The unblocked part of the window can form an air inlet window 1310 and an air outlet window 1320.

[0088] It should be understood that in some other implementations of the embodiments of this application, the air inlet window 1310, the air outlet window 1320, and the heat dissipation window 1330 can also be independent of each other, which does not affect the implementation and application of the embodiments of this application.

[0089] In addition, in some other implementations of the embodiments of this application, the partition 1300 may not be provided with heat dissipation window 1330. In this case, there may still be a partition 1300 between the evaporator 3110 and the first heating device 2100, so as to achieve indirect thermal contact between the evaporator 3110 and the first heating device 2100 through the partition 1300.

[0090] In some implementations, such as Figure 14 As shown, the second direction Y can be the height direction of the chassis 1000.

[0091] The chassis 1000 includes a top plate 1110 and a bottom plate 1120, which are arranged along a second direction Y. Along the second direction Y, the shortest distance L1 between the air outlet 1320 and the top plate 1110 is less than the shortest distance L2 between the air outlet 1320 and the bottom plate 1120. That is, the air outlet 1320 can be positioned in the partition 1300 relatively close to the top plate 1110. Since hot air typically rises, positioning the air outlet 1320 relatively close to the top plate 1110 is more conducive to venting the hot air in the first chamber 1100 to the heat exchanger 3200 through the air outlet 1320.

[0092] As for the air inlet window 1310, its location on the partition 1300 is not limited.

[0093] In some implementations, such as Figure 12 and Figure 13 As shown, the power conversion device 100 may also include a first fan 4000.

[0094] The first fan 4000 can be installed inside the first chamber 1100. The first fan 4000 is used to send the air in the first chamber 1100 to the heat exchange device 3200 through the air outlet 1320, and the first fan 4000 is also used to introduce the air in the heat exchange device 3200 into the first chamber 1100 through the air inlet 1310. That is to say, the first fan 4000 can provide power for the air circulation between the first chamber 1100 and the heat exchange device 3200.

[0095] The first fan 4000 can be located on the side of the second heating element 2300 facing the air inlet window 1310. Alternatively, the first fan 4000 can also be located on the side of the second heating element 2300 facing the air outlet window 1320. Alternatively, when there are multiple second heating elements 2300, the first fan 4000 can be disposed among these second heating elements 2300. In other words, the embodiments of this application do not limit the placement of the first fan 4000. In practical applications, those skilled in the art can select the location according to specific needs, as long as it meets the requirements of use.

[0096] The number of first 4000 fans can be one, or the number of first 4000 fans can be multiple, and there is no limitation here.

[0097] In some implementations, such as Figure 12 As shown, the air inlet window 1310 and the air outlet window 1320 are arranged along the first direction X.

[0098] In this implementation, at least one of the air inlet window 1310 and the air outlet window 1320 has at least partial overlap in projection along the first direction X with the projection of the second heating device 2300 along the first direction X. Thus, the air flowing in through the air inlet window 1310 or flowing out through the air outlet window 1320 can directly blow on at least a portion of the second heating device 2300, achieving more efficient air cooling of the heating unit 2000.

[0099] In some implementations, such as Figure 10 and Figure 11 As shown, the power conversion device 100 may also include a second fan 8000.

[0100] The second fan 8000 can be installed in the second chamber 1200 to provide forced convection cooling for the heat dissipation unit 3000, thereby improving the heat dissipation effect of the heat dissipation unit 3000.

[0101] In the implementation shown in the attached drawings, the second air inlet 1400 and the second air outlet 1500 are respectively disposed on two opposing walls of the second chamber 1200 along the second direction Y, and the second fan 8000 is disposed on the side of the heat dissipation unit 3000 facing the second air inlet 1400. Alternatively, in some other implementations of this application, the second fan 8000 may also be disposed on the side of the heat dissipation unit 3000 facing the second air outlet 1500.

[0102] The number of second fans 8000 can be one, or the number of second fans 8000 can be multiple, without limitation. In addition, when there are multiple second fans 8000, the distribution positions of each second fan 8000 in the second chamber 1200 can be different; for example, some of the second fans 8000 can be set on the side of the heat dissipation unit 3000 facing the second air inlet 1400, while other second fans 8000 can be set on the side of the heat dissipation unit 3000 facing the second air outlet 1500.

[0103] It should be understood that in some other implementations of the embodiments of this application, the second fan 8000 may not be provided. In this case, the second chamber 1200 will be cooled by natural convection, which is also feasible.

[0104] In some implementations, such as Figure 9 and Figure 10 As shown, the heating unit 2000 may also include a magnetic device 2400.

[0105] The magnetic device 2400 can be, for example, a reactance or an inductor. The magnetic device 2400 can be disposed in the second chamber 1200 to utilize air convection within the second chamber 1200 for heat dissipation. In the embodiment shown in the attached figure, the magnetic device 2400 can be disposed on the side of the heat dissipation unit 3000 facing the second air outlet 1500, so that the cooling airflow can first dissipate heat from the heat dissipation unit 3000 and then flow to the magnetic device 2400 for further cooling.

[0106] In addition, in some other implementations of the embodiments of this application, the magnetic device 2400 may be disposed on the side of the heat dissipation unit 3000 facing the second air inlet 1400. In this case, the heat dissipation airflow may first dissipate heat on the magnetic device 2400 and then flow to the heat dissipation unit 3000 for heat dissipation. Alternatively, the magnetic device 2400 may be disposed in the first chamber 1100 for heat dissipation within the first chamber 1100, which is also feasible.

[0107] Please refer to Figures 15-19 , Figure 15 This is a schematic diagram of a power conversion device with two condensers for heat dissipation. The chassis has been partially removed in the diagram to show the internal structure of the second chamber. Figure 16 for Figure 15 A cross-sectional view perpendicular to the first direction; Figure 17 for Figure 15 A schematic diagram of a modified design; Figure 18 for Figure 15 A structural diagram from another perspective, in which the chassis has been partially removed to illustrate the internal structure of the first chamber.

[0108] In some implementations, such as Figure 15 and Figure 16 As shown, in the heat dissipation device 3100, there can be two condensers 3120, and the two condensers 3120 can be arranged at intervals along the second direction Y.

[0109] Two condensers 3120 can share the same evaporator 3110, which may have only one evaporation chamber 3111; in this case, the structure of the evaporator 3110 can be relatively simple. Alternatively, the evaporator 3110 may have two evaporation chambers 3111, which can be used in conjunction with the two condensers 3120 respectively. This type of evaporator 3110 may be formed by splicing two evaporation plates, or it may be formed by opening two cavities on one evaporation plate to serve as two evaporation chambers 3111 respectively.

[0110] In this implementation, the two condensers 3120 can each be configured with two independent heat exchange devices 3200. In this case, the partition 1300 can be provided with two independent air inlet windows 1310 and two independent air outlet windows 1320 to supply and exhaust air to the two heat exchange devices 3200 respectively. Of course, it is also possible for the two heat exchange devices 3200 to share the same air inlet window 1310 and the same air outlet window 1320.

[0111] It should be understood that the above description of the specific structure of the heat dissipation unit 3000 is only a combination of embodiments of this application. Figure 15 and Figure 16 This is an exemplary description and should not be construed as limiting the scope of the power conversion device 100 provided in this application. In some other implementations of this application, the heat dissipation unit 3000 may also have other structures. For example, the number of condensers 3120 may be greater than or equal to three, in which case at least two condensers 3120 may share one evaporator 3110. Alternatively, the number of condensers 3120 may be greater than or equal to two, and each condenser 3120 may be configured with an independent evaporator 3110, which is also feasible.

[0112] For cases where there are at least two condensers 3120, the second fan 8000 can be integrally located on one side of each condenser 3120 along the second direction Y, for example... Figure 15 and Figure 16 As shown. Alternatively, the second fan 8000 can also be positioned between two adjacent condensers 3120 along the second direction Y, for example... Figure 17 As shown.

[0113] In some implementations, such as Figure 18 and Figure 19 As shown, the power conversion device 100 also includes a wind collector shroud 100A.

[0114] The air collector shroud 100A has a first opening and a second opening. The first opening is connected to either the air inlet window 1310 or the air outlet window 1320, and the second opening faces at least a portion of the heat-generating unit 2000. The air collector shroud 100A has a rectifying function; by setting the second opening of the air collector shroud 100A to face at least a portion of the heat-generating unit 2000, the air can be directly blown onto that portion of the heat-generating unit 2000, thereby improving the heat dissipation effect.

[0115] For ease of description, in this embodiment, the air collecting hood 100A connected to the air inlet window 1310 can be referred to as the first air collecting hood 5000, and the air collecting hood 100A connected to the air outlet window 1320 can be referred to as the second air collecting hood 6000. In practical applications, both the first air collecting hood 5000 and the second air collecting hood 6000 can be provided, or one of them can be provided; no specific limitation is made here.

[0116] For either the first air hood 5000 or the second air hood 6000, the number of the first opening and the number of the second opening are not limited here. In practical applications, those skilled in the art can determine the number of air inlet windows 1310 and air outlet windows 1320, as well as the distribution of each heating element in the heating unit 2000.

[0117] In some implementations, the first fan 4000 can be located at the second opening of the air collection hood 100A (i.e., the first air collection hood 5000 and the second air collection hood 6000).

[0118] For the first air collector hood 5000, the first fan 4000 is positioned at the second opening of the first air collector hood 5000, so that the suction force generated by the first fan 4000 can directly act on the air inlet window 1310, which helps to improve the air intake circulation efficiency. For the second air collector hood 6000, the first fan 4000 is positioned at the second opening of the second air collector hood 6000, so that the air drawn by the first fan 4000 can be directly introduced into the air outlet window 1320, which can better achieve air outlet at the air outlet window 1320, which helps to improve the air outlet circulation efficiency.

[0119] It should be understood that in some other implementations of the embodiments of this application, the above-mentioned air collecting hood 100A may not be provided, for example... Figure 18 As shown, this is also feasible.

[0120] Please refer to Figure 20 and Figure 21 , Figure 20 for Figure 4 A schematic diagram of a modified design; Figure 21 for Figure 20 A cross-sectional view perpendicular to the first direction.

[0121] like Figure 20 and Figure 21 As shown, the evaporator 3110 can be a cold plate, and the condenser tube 3122 can be located on the normal (i.e., the third direction Z) side of the cold plate. At least one connecting pipe 3122A can be provided inside the condenser tube 3122.

[0122] With the cold plate perpendicular to both its normal and vertical directions, the connecting pipe 3122A can gradually tilt upwards from the direction away from the cold plate. In this way, the liquid working fluid formed by condensation within the condenser pipe 3122 and the first manifold 3121 can better flow back to the evaporator 3110 along the condenser pipe 3122 under the influence of gravity, thereby increasing the circulation rate of the heat exchange working fluid and thus improving the heat dissipation efficiency of the heat dissipation unit 3000 in this embodiment.

[0123] Here, the embodiments of this application do not limit the specific structural form of the connecting pipe 3122A. In practical applications, those skilled in the art can choose according to specific needs, as long as it can meet the requirements of use. For example, the extension direction of the connecting pipe 3122A can be a straight line. As another example, the extension direction of the connecting pipe 3122A can also be an arc direction, a broken line direction, or other complex linear directions.

[0124] In this implementation, the arrangement of the first busbar component 3121 and the first pipe segment 3211 is not limited. In practical applications, those skilled in the art can refer to... Figure 21 You can design it, or you can adjust it as needed.

[0125] Please refer to Figures 22-24 , Figure 22 This is a schematic diagram of the structure of the second type of heat dissipation unit in the embodiments of this application; Figure 23 for Figure 22 A schematic diagram of a cross-section perpendicular to the second direction; Figure 24 For installation Figure 22 A schematic diagram of the power conversion device of the heat dissipation unit is shown in the figure. The chassis has been partially removed to show the internal structure of the second chamber.

[0126] In some implementations, such as Figure 22 and Figure 23 As shown, the heat exchange tube 3210 may also consist of only the first tube section 3211, the second tube section 3212, and the third tube section 3213.

[0127] In this implementation, the first pipe segment 3211 can be located only partially in the first manifold 3121A, and the two ends of the first pipe segment 3211 can be directly connected to the second pipe segment 3212 and the third pipe segment 3213, respectively. The number of the first pipe segment 3211, the second pipe segment 3212 and the third pipe segment 3213 can be exactly the same.

[0128] The first pipe segment 3211, the second pipe segment 3212, and the third pipe segment 3213, which are connected, can be a single-piece structure. In this case, the first pipe segment 3211, the second pipe segment 3212, and the third pipe segment 3213 can be different segments of the same pipe, and the heat exchange tube 3210 formed is a bent pipe as a whole. Alternatively, at least one of the connected first pipe segments 3211, the second pipe segment 3212, and the third pipe segment 3213 can be manufactured separately and then assembled with other pipe segments through welding, joint connection, or other connection methods. This is also feasible.

[0129] like Figure 24 As shown, in this implementation, the magnetic device 2400 can still be placed in the second chamber 1200 for air cooling by the second fan 8000.

[0130] Please refer to Figures 25-29 , Figure 25 This is a schematic diagram of the structure of the third type of heat dissipation unit in the embodiments of this application; Figure 26 for Figure 25 A structural diagram from another perspective; Figure 27 for Figure 25 A cross-sectional view perpendicular to the first direction; Figure 28 For installation Figure 25 A schematic diagram of the power conversion device of the heat dissipation unit. The chassis has been partially removed to show the internal structure of the second chamber. Figure 29 For installation Figure 25 A projection view of the first chamber of the power conversion device of the heat dissipation unit along a third direction.

[0131] In some implementations, such as Figures 25-28 As shown, the first pipe segment 3211 may extend along the second direction Y.

[0132] The first busbar component 3121 may include two second end plates 3121C arranged opposite each other along the second direction Y. The second end plates 3121C may be provided with second connection ports 3121C1. The two ends of the first pipe segment 3211 are respectively sealed and inserted into the second connection ports 3121C1 of the two second end plates 3121C to realize the installation and fixation of the first pipe segment 3211 in the first busbar component 3121.

[0133] The connection method between the first pipe section 3211 and the second end plate 3121C can be referred to the above description of the connection method between the first pipe section 3211 and the first end plate 3121B, and will not be repeated here.

[0134] In this embodiment of the application, the second pipe segment 3212 and the third pipe segment 3213 may be located on both sides of the first busbar component 3121 along the second direction Y.

[0135] In this implementation, such as Figure 26 As shown, the first air inlet 3310A and the first air outlet 3310B are both located on the same side of the evaporator 3110 along the first direction X. Correspondingly, the air inlet channel 3330 and the air outlet channel 3340 can also be located on the same side of the evaporator 3110 along the first direction X. Furthermore, the air inlet channel 3330 and the air outlet channel 3340 are directly connected, that is, there is no obstruction between them. Thus, the processing and fabrication of the air inlet channel 3330 and the air outlet channel 3340 in the base frame 3300 can be relatively simple.

[0136] In addition, in some other implementations of this application, the air inlet channel 3330 and the air outlet channel 3340 can be isolated from each other, which can largely prevent cross-contamination between the air inlet channel 3330 and the air outlet channel 3340. For example, the evaporator 3110 can be placed between the air inlet channel 3330 and the air outlet channel 3340, thereby blocking the air inlet channel 3330 and the air outlet channel 3340. In this case, the air inlet channel 3330 and the air outlet channel 3340 can be located on both sides of the evaporator 3110 along the second direction Y. As another example, a partition component can be provided in the base frame 3300 to separate the air inlet channel 3330 and the air outlet channel 3340.

[0137] like Figure 29 As shown, when the second direction Y is the height direction of the chassis 1000, in this implementation, the air inlet window 1310 and the air outlet window 1320 are arranged along the height direction of the chassis 1000. The air inlet window 1310 can be located above the air outlet window 1320, or it can be located below the air outlet window 1320.

[0138] The projection of the line connecting the highest point of the upper air inlet window 1310 and the lowest point of the lower air outlet window 1320 along the first direction X is the first projection. The projection of the heating unit 2000 along the first direction X is the second projection. The first and second projections may overlap at least partially. In this way, by adjusting the position of the heating unit 2000 relative to the air inlet window 1310 and the air outlet window 1320, the air flowing in through the air inlet window 1310 or the air flowing out through the air outlet window 1320 can directly blow onto at least part of the heating unit 2000, thereby better achieving the cooling effect of the heat exchanger 3200 on the heating unit 2000.

[0139] exist Figure 29 In this embodiment, the air inlet window 1310 and the air outlet window 1320 are connected, meaning there is no obstruction between them. Alternatively, in some other implementations of this application, a partition plate or similar separating component can be added to separate the air inlet window 1310 and the air outlet window 1320. This largely prevents the air intake of the air inlet window 1310 from being directly discharged through the air outlet window 1320.

[0140] Please refer to Figures 30-32 , Figure 30 This is a schematic diagram of a power conversion device that shares a heat exchange unit with two first busbar components. The chassis has been partially removed in the diagram to show the internal structure of the second chamber. Figure 31 for Figure 30 A cross-sectional view perpendicular to the first direction; Figure 32 for Figure 30 A schematic diagram of the internal structure of the first chamber.

[0141] In some implementations, such as Figure 30 As shown, there can be two first manifold components 3121, and the two first manifold components 3121 can be arranged along the second direction Y. There can be one heat exchange device 3200, and the first pipe section 3211 of the heat exchange tube 3210 can extend along the second direction Y and be sealed and inserted into the two first manifold components 3121 along the second direction Y.

[0142] With this configuration, the number of heat exchange devices 3200 can be relatively small, simplifying the specific structure of the heat dissipation unit 3000 in this embodiment. Furthermore, the heat exchange device 3200 can simultaneously exchange heat with two first confluence components 3121, which also helps improve the cooling and heat exchange effect of the air inside the heat exchange device 3200.

[0143] It should be understood that the above description of the specific structure of the heat dissipation unit 3000 is only a combination of embodiments of this application. Figure 30 and Figure 31 This is an exemplary description and should not be construed as limiting the scope of the power conversion device 100 provided in this application. In some other implementations of this application, the heat dissipation unit 3000 may also have other structures. For example, the number of first busbar components 3121 may be greater than or equal to three, while the number of heat exchange devices 3200 may be less than the number of first busbar components 3121. In this case, at least one heat exchange device 3200 may be simultaneously inserted into at least two first busbar components 3121 to exchange heat with multiple first busbar components 3121. Alternatively, the number of first busbar components 3121 may be at least two, and the number of heat exchange devices 3200 may also be at least two, with the number of first busbar components 3121 and the number of heat exchange devices 3200 being the same. In this case, each heat exchange device 3200 and each first busbar component 3121 may be configured in a one-to-one correspondence, meaning that each heat exchange device 3200 may be inserted into one first busbar component 3121.

[0144] Taking a heat exchanger 3200 as an example, and the first busbar component 3121 as an example, Figure 31 As shown, the first manifold 3121 may include a second end plate 3121C and a return bottom plate 3121D. The second end plate 3121C forms an angle with the second direction Y, and the return bottom plate 3121D is the wall plate of the first manifold 3121 facing the evaporator 3110. The second end plate 3121C is provided with a second connection port 3121C1, and the return bottom plate 3121D is provided with a third connection port 3121D1. The first pipe section 3211 is sealed and inserted into the second connection port 3121C1, and the other pipe sections of the heat exchange tube 3210 (the second pipe section 3212 or the third pipe section 3213) are sealed and inserted into the third connection port 3121D1 to realize the installation and fixation between the heat exchange tube 3210 and the first manifold 3121. The specific sealing and insertion method is as described above and will not be repeated here. In this implementation, more of the heat exchange tube 3210 can be located in the first busbar component 3121, which has a relatively positive effect on improving the heat exchange effect of the air inside the heat exchange tube 3210.

[0145] In some implementations, such as Figure 32 As shown, the magnetic device 2400 can also be disposed in the first chamber 1100, and the magnetic device 2400 can be in thermal contact with the evaporator 3110 so as to dissipate heat using the evaporator 3110.

[0146] In addition, in some other implementations of the embodiments of this application, the magnetic device 2400 may simply be disposed in the first chamber 1100 but not in thermal contact with the evaporator 3110. In this case, the magnetic device 2400 may be cooled by the cooling air provided by the first fan 4000.

[0147] Please refer to Figure 33 , Figure 33 This is a schematic diagram of the structure of the fourth type of heat dissipation unit in the embodiments of this application.

[0148] In some implementations, such as Figure 33 As shown, the heat exchange tube 3210 can also be sealed and inserted into at least part of the condenser tube 3122 and make contact with the heat exchange medium inside the condenser tube 3122 for heat exchange. In this way, direct contact heat exchange between the heat exchange tube 3210 and the heat exchange medium can also be achieved.

[0149] Specifically, the heat exchange tube 3210 may include a first tube segment 3211 extending along the first direction X, and the condenser tube 3122 may be provided with a through hole 3122B extending along the first direction X. The through hole 3122B may be connected to the connecting pipe 3122A inside the condenser tube 3122. The first tube segment 3211 may be sealed and inserted into the through hole 3122B. In this way, the heat exchange medium in the connecting pipe 3122A may come into contact with the first tube segment 3211.

[0150] The sealing insertion method of the first pipe section 3211 and the through hole 3122B can be consistent with the sealing insertion method of the first pipe section 3211 and the first connection port 3121B1 mentioned above, and will not be repeated here.

[0151] In this implementation, the heat exchange tube 3210 may further include a second tube segment 3212 and a third tube segment 3213. The second tube segment 3212 and the third tube segment 3213 may be located on both sides of the first tube segment 3211 along the first direction X. The first tube segment 3211 may be directly or indirectly connected to either the second tube segment 3212 or the third tube segment 3213.

[0152] Please refer to Figure 34 and Figure 35 , Figure 34 This is a schematic diagram of the structure of the fifth type of heat dissipation unit in the embodiments of this application; Figure 35 for Figure 34 A cross-sectional view perpendicular to the second direction.

[0153] In some implementations, such as Figure 34 and Figure 35As shown, the condenser 3120 not only has the aforementioned first manifold 3121 and condenser tube 3122, but also includes a second manifold 3123.

[0154] Each condenser tube 3122 is arranged along the first direction X. One end of each condenser tube 3122 is connected to the first manifold 3121, and the other end is connected to the second manifold 3123 and communicates with the second manifold cavity 3123A. The second manifold cavity 3123A is also connected to the evaporation cavity 3111. With this configuration, after the liquid working fluid in the evaporator 3110 evaporates to form a gaseous working fluid, the gaseous working fluid can first enter the second manifold cavity 3123A, and then flow to the first manifold cavity 3121A through the condenser tubes 3122. During this process, the gaseous working fluid can condense and liquefy at any location, such as the second manifold 3123, the condenser tubes 3122, or the first manifold 3121. The resulting liquid working fluid can flow back into the evaporation cavity 3111 to complete the circulation of the heat exchange working fluid. At least a portion of the heat exchange tube 3210 is located within the second manifold 3123A and can exchange heat with the heat exchange medium within the second manifold 3123A. This also enables direct contact heat exchange between the heat exchange tube 3210 and the heat exchange medium.

[0155] Specifically, the second busbar component 3123 may include two third end plates 3123B arranged opposite to each other along the first direction X. The third end plates 3123B may be provided with a fourth connection port 3123B1. The first pipe segment 3211 may be sealed and inserted into the fourth connection port 3123B1 to realize the installation and fixation of the first pipe segment 3211 in the second busbar component 3123.

[0156] The sealing insertion method of the first pipe section 3211 and the fourth connection port 3123B1 can be consistent with the sealing insertion method of the first pipe section 3211 and the first connection port 3121B1 mentioned above, and will not be repeated here.

[0157] In this implementation, the heat exchange tube 3210 may further include a second tube segment 3212 and a third tube segment 3213. The second tube segment 3212 and the third tube segment 3213 may be located on both sides of the first tube segment 3211 along the first direction X. The first tube segment 3211 may be directly or indirectly connected to either the second tube segment 3212 or the third tube segment 3213.

[0158] like Figure 34 and Figure 35As shown, both the second pipe segment 3212 and the third pipe segment 3213 can be located outside the second manifold 3123; that is, in the heat exchange pipe 3210, only the first pipe segment 3211 may be located in the second manifold 3123A. In addition, in some other implementations of this application, at least one of the second pipe segment 3212 and the third pipe segment 3213 may also be located in the second manifold 3123A, which is also feasible.

[0159] Please refer to Figure 36 and Figure 37 , Figure 36 This is a structural diagram of the sixth implementation method in the embodiments of this application; Figure 37 The figure shows a structural schematic diagram of the seventh implementation method in the embodiments of this application.

[0160] In some implementations, the heat exchange tube 3210 may be located outside the condenser 3120, and at least part of the heat exchange tube 3210 may be in contact with the outer wall of the condenser 3120 to indirectly exchange heat with the heat exchange medium in the condenser 3120. This can also improve the heat exchange effect of the air inside the heat exchange tube 3210.

[0161] In one scheme, such as Figure 36 As shown, the heat exchange tube 3210 can be located outside the first manifold 3121, and the heat exchange tube 3210 can be in contact with the outer wall surface of the first manifold 3121 to indirectly exchange heat with the heat exchange medium inside the first manifold 3121. In another embodiment, as shown... Figure 37 As shown, the heat exchange tube 3210 can be located outside the condenser tube 3122, and the heat exchange tube 3210 can be in contact with the outer wall surface of the condenser tube 3122 to indirectly exchange heat with the heat exchange medium inside the condenser tube 3122. In another embodiment, referring to the aforementioned Figure 34 When the condenser 3120 includes the second manifold 3123, the heat exchange tube 3210 can also be attached to the outer wall of the second manifold 3123 to indirectly exchange heat with the heat exchange medium in the second manifold 3123.

[0162] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A heat dissipation unit, characterized in that, include: A heat dissipation device (3100) includes an evaporator (3110) and a condenser (3120). The evaporator (3110) has an evaporation chamber (3111), and the condenser (3120) has a condensation chamber (3120A). The evaporation chamber (3111) and the condensation chamber (3120A) are connected to each other. A heat exchange device (3200) includes a heat exchange tube (3210), the two ends of which form a first air inlet (3210A) and a first air outlet (3210B), and at least a portion of the heat exchange tube (3210) is configured to exchange heat with the heat exchange medium in the condenser (3120).

2. The heat dissipation unit according to claim 1, characterized in that, The condenser (3120) includes a first manifold (3121) and a plurality of condenser tubes (3122). The first manifold (3121) has a first manifold cavity (3121A). Each of the condenser tubes (3122) is arranged along a first direction. One end of each condenser tube (3122) is connected to the evaporation cavity (3111), and the other end of each condenser tube (3122) is connected to the first manifold cavity (3121A). At least a portion of the heat exchange tube (3210) is located in the first manifold cavity (3121A) and exchanges heat with the heat exchange medium in the first manifold cavity (3121A).

3. The heat dissipation unit according to claim 2, characterized in that, The heat exchange tube (3210) includes a first tube segment (3211) extending along a first direction; the first manifold (3121) includes two first end plates (3121B) arranged opposite to each other along the first direction, the first end plate (3121B) is provided with a first connection port (3121B1), and the first tube segment (3211) is sealed and inserted into the first connection port (3121B1).

4. The heat dissipation unit according to claim 3, characterized in that, The first air inlet (3210A) and the first air outlet (3210B) are located on both sides of the evaporator (3110) along the first direction.

5. The heat dissipation unit according to claim 2, characterized in that, The heat exchange tube (3210) includes a first tube segment (3211) extending along a second direction, the second direction and the first direction forming an angle; the first manifold (3121) includes a second end plate (3121C) arranged at an angle to the second direction, the second end plate (3121C) is provided with a second connection port (3121C1), and the first tube segment (3211) is sealed and inserted into the second connection port (3121C1).

6. The heat dissipation unit according to claim 5, characterized in that, There are two second end plates (3121C), and the two second end plates (3121C) are arranged opposite each other along the second direction. The first pipe section (3211) is sealed and inserted into the two second end plates (3121C).

7. The heat dissipation unit according to claim 5, characterized in that, The first manifold component (3121) also includes a manifold base plate (3121D), which is connected to the condenser tube (3122). The manifold base plate (3121D) is provided with a third connection port (3121D2), and the heat exchange tube (3210) also includes a tube section that is sealed and inserted into the third connection port (3121D2).

8. The heat dissipation unit according to claim 5, characterized in that, The first air inlet (3210A) and the first air outlet (3210B) are located on the same side of the evaporator (3110) along the first direction.

9. The heat dissipation unit according to claim 5, characterized in that, The number of condensers (3120) is at least two, and each condenser (3120) is arranged at intervals along the second direction. The first pipe section (3211) is inserted into the first manifold (3121A) of each condenser (3120).

10. The heat dissipation unit according to any one of claims 3-9, characterized in that, The heat exchange tube (3210) further includes a second tube section (3212) and a third tube section (3213). One end of the second tube section (3212) is connected to the first tube section (3211), and the other end of the second tube section (3212) forms the first air inlet (3210A). One end of the third tube section (3213) is connected to the first tube section (3211), and the other end of the third tube section (3213) forms the first air outlet (3210B).

11. The heat dissipation unit according to claim 10, characterized in that, The heat exchange device (3200) further includes a first adapter (3220), to which both the first pipe section (3211) and the second pipe section (3212) are connected, and the first pipe section (3211) and the second pipe section (3212) are connected through the first adapter (3220); and / or, The heat exchange device (3200) further includes a second adapter (3230), and the third pipe section (3213) and the first pipe section (3211) are both connected to the second adapter (3230). The third pipe section (3213) and the first pipe section (3211) are connected through the second adapter (3230).

12. The heat dissipation unit according to claim 1, characterized in that, The condenser (3120) includes a first manifold (3121) and a plurality of condenser tubes (3122). The first manifold (3121) has a first manifold cavity (3121A). Each of the condenser tubes (3122) is arranged along a first direction. One end of each condenser tube (3122) is connected to the evaporation cavity (3111), and the other end of each condenser tube (3122) is connected to the first manifold cavity (3121A). The heat exchange tube (3210) is sealed and inserted into at least a portion of the condenser tubes (3122) and exchanges heat with the heat exchange medium inside the condenser tubes (3122). The heat exchange tube (3210) includes a first tube segment (3211) extending in a first direction, and the condenser tube (3122) is provided with a through hole (3122B) extending in the first direction. The first tube segment (3211) is sealed and inserted into the through hole (3122B).

13. The heat dissipation unit according to claim 1, characterized in that, The condenser (3120) includes a first manifold (3121), a second manifold (3123), and a plurality of condenser tubes (3122); the first manifold (3121) has a first manifold cavity (3121A), and the second manifold (3123) has a second manifold cavity (3123A); each of the condenser tubes (3122) is arranged along a first direction, one end of the condenser tube (3122) is connected to the first manifold cavity (3121A), and the other end of the condenser tube (3122) is connected to the second manifold cavity (3123A). The second manifold cavity (3123A) is also connected to the evaporation cavity (3111). At least a portion of the heat exchange tube (3210) is located in the second manifold cavity (3123A) and exchanges heat with the heat exchange medium in the second manifold cavity (3123A).

14. The heat dissipation unit according to claim 1, characterized in that, The heat exchange tube (3210) is located outside the condenser (3120), and at least part of the heat exchange tube (3210) is in contact with the outer wall surface of the condenser (3120).

15. The heat dissipation unit according to claim 14, characterized in that, The condenser (3120) includes a first manifold (3121) and a plurality of condenser tubes (3122). The first manifold (3121) has a first manifold cavity (3121A). Each of the condenser tubes (3122) is arranged along a first direction. One end of each condenser tube (3122) is connected to the evaporation cavity (3111), and the other end of each condenser tube (3122) is connected to the first manifold cavity (3121A). At least a portion of the heat exchange tube (3210) and the outer wall surface of the first manifold (3121) are in contact; and / or, at least a portion of the heat exchange tube (3210) and the outer wall surface of the condenser tube (3122) are in contact.

16. The heat dissipation unit according to any one of claims 1-15, characterized in that, The heat dissipation unit (3000) also includes a base frame (3300), the evaporator (3110) is mounted on the base frame (3300), the base frame (3300) is provided with an installation opening (3321), and the first air inlet (3210A) and the first air outlet (3210B) are both connected to the installation opening (3321).

17. The heat dissipation unit according to claim 16, characterized in that, The base frame (3300) includes a frame (3310) and a mounting plate (3320) located on the frame (3310), the mounting opening (3321) is provided on the mounting plate (3320), and the evaporator (3110) is connected to the mounting plate (3320).

18. A power conversion device, characterized in that, The device includes a chassis (1000), a heating unit (2000), and a heat dissipation unit (3000); the chassis (1000) is provided with a partition (1300), which divides the chassis (1000) into a first chamber (1100) and a second chamber (1200) that are isolated from each other; the heating unit (2000) includes a first heating element (2100), which is located in the first chamber (1100); The heat dissipation unit (3000) is the heat dissipation unit according to any one of claims 1-17. The heat dissipation unit (3000) is installed on the partition (1300). The evaporator (3110) and the first heating device (2100) are in thermal contact. The condenser (3120) and the heat exchange tube (3210) are both located in the second chamber (1200). The first air inlet (3210A) and the first air outlet (3210B) are both connected to the first chamber (1100).

19. The power conversion device according to claim 18, characterized in that, The partition (1300) is provided with an air inlet window (1310) and an air outlet window (1320). The first air inlet (3210A) and the air outlet window (1320) are connected, and the first air outlet (3210B) and the air inlet window (1310) are connected.

20. The power conversion device according to claim 19, characterized in that, The partition (1300) extends along the height direction of the chassis (1000), which includes a top plate (1110) and a bottom plate (1120). The shortest distance between the air outlet window (1320) and the bottom plate (1120) in the height direction is greater than the shortest distance between the air outlet window (1320) and the top plate (1110) in the height direction.

21. The power conversion device according to claim 19, characterized in that, The partition (1300) extends along the height direction of the chassis (1000), the air inlet window (1310) and the air outlet window (1320) are arranged along a first direction, the first direction is perpendicular to the normal of the partition (1300), and the first direction forms an angle with the height direction; The heating unit (2000) further includes a circuit board (2200) and a second heating device (2300), wherein the first heating device (2100) and the second heating device (2300) are located on opposite sides of the circuit board (2200) in the normal direction. The projection of the second heating device (2300) along the first direction and the projection of the air inlet window (1310) along the first direction overlap at least partially; and / or, the projection of the second heating device (2300) along the first direction and the projection of the air outlet window (1320) along the first direction overlap at least partially.

22. The power conversion device according to claim 19, characterized in that, The partition (1300) extends along the height direction of the chassis (1000), and the air inlet window (1310) and the air outlet window (1320) are arranged along the height direction of the chassis (1000); The projection of the line connecting the highest point of the upper air inlet window (1310) and the lowest point of the lower air outlet window (1320) along the first direction is the first projection; the projection of the heating unit (2000) along the first direction is the second projection, and the first projection and the second projection at least partially overlap.

23. The power conversion device according to claim 19, characterized in that, The power conversion device (100) further includes an air collecting hood (100A), which has a first opening and a second opening. The first opening is connected to the air inlet window (1310) or the air outlet window (1320), and the second opening faces at least part of the heating unit (2000).

24. The power conversion device according to claim 23, characterized in that, The power conversion device (100) further includes a first fan (4000) which is installed at the second opening.

25. The power conversion device according to any one of claims 18-24, characterized in that, The power conversion device (100) further includes a second fan (8000), which is disposed in the second chamber (1200). The number of condensers (3120) is at least two, and the condensers (3120) are arranged at intervals. The second fan (8000) is located between two adjacent condensers (3120).

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