Heat exchanger and power conversion device
Patent Information
- Application Number
- CN202522006884.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-17
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-09-17
AI Technical Summary
然而，这两种降低腔温的方式存在两个重要缺陷，一来换热器件同时占用了两个腔体空间，影响腔内器件布局安装，二来散热能力有限，由于体积较大，不便于沿机箱宽度方向铺排布局，只能借用少数外部散热腔的风扇吹风散热，制约了其降低腔温的能力
本申请的换热器，通过在一个集气盒的腔体中设置集气腔，集气腔与外部所设置的中空的换热翅片间气路连通，当有热风或者冷风通入集气腔上的进风口后，风经一个集气腔进入到换热翅片中，通过换热翅片交换热量后再次进入到另一集气腔中，然后再从出风口排出，或者再经历一次或以上的由换热翅片到下一集气腔的循环后再由出风口排出，此时从出风口排出的即为冷风或者热风，据此结构的换热器可将内部热气流与外部进行热交换散热，也可将外部冷气流导入内部以对内部进行降温，如此即可快速实现散热，且这一换热器尤其适用封闭环境下的散热需求。
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Figure CN224790950U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat dissipation technology, and in particular to a heat exchanger and power conversion device. Background Technology
[0002] With the booming development of photovoltaic energy storage and other fields, core grid-connected components such as inverters or energy storage converters are increasingly showing a trend of high power density and miniaturization, which also puts forward higher and higher requirements for their heat dissipation devices such as radiators and heat exchangers.
[0003] Currently, power modules often employ surface-mount heat pipes with spade-shaped fins or profile heat sinks combined with interface materials to conduct heat to the fins, which are then cooled by fans. Common methods for reducing the cavity temperature of power converters include adding extended surfaces between the two cavities, such as between the power cavity and the heat dissipation cavity, such as profile fins at both ends, to achieve internal and external heat exchange; or using microchannel heat exchangers to connect the two ends of the power cavity and the heat dissipation cavity for heat dissipation. However, these two methods have two significant drawbacks: firstly, the heat exchange devices occupy space in both cavities, affecting the layout and installation of components within the cavities; secondly, their heat dissipation capacity is limited. Due to their large size, they are not convenient to be laid out along the width of the chassis, and can only rely on the fans of a few external heat dissipation cavities for cooling, thus limiting their ability to reduce cavity temperature. Utility Model Content
[0004] One of the main objectives of this invention is to overcome at least one of the above-mentioned defects and to provide a heat exchanger and power conversion device with good heat exchange effect, especially suitable for heat dissipation of enclosed cavities in power conversion devices, without occupying too much cavity space and avoiding affecting the device layout.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a heat exchanger, which includes a gas collection box and a plurality of heat exchange fins arranged along a first direction on a first side of the gas collection box. An air outlet and an air inlet are opened on a second side of the gas collection box along the first direction. The first side and the second side are two opposite sides. Each heat exchange fin is provided with an internal circulation channel. The gas collection box has a cavity inside, and the internal circulation channel is connected to the cavity of the gas collection box. A first partition is arranged in the cavity along the first direction, and the first partition divides the cavity into two gas collection chambers: a first gas collection chamber and a second gas collection chamber. The air duct inside the heat exchanger from the air inlet to the air outlet circulates between the two gas collection chambers and the internal circulation channel in each heat exchange fin.
[0006] According to one embodiment of the present invention, each heat exchange fin is open at one end of the cavity of the gas collection box, while the remaining geometric surfaces are closed, in order to form the internal circulation channel with one open end.
[0007] According to one embodiment of the present invention, the first side of the cavity of the gas collecting box that contacts the fins is provided with a through hole for connecting the cavity and the inner circulation channel.
[0008] According to one embodiment of the present invention, one of the air outlet and the air inlet is connected to the first air collection chamber, and the other is connected to the second air collection chamber.
[0009] According to one embodiment of the present invention, at least one second partition is provided in the first air collecting chamber, the second partition being arranged along a first direction to divide the interior of the chamber into at least three chambers, and both the air outlet and the air inlet are provided on the first air collecting chamber; or, at least one third partition is provided in the second air collecting chamber, the third partition being arranged along a first direction to divide the interior of the chamber into at least three chambers, and both the air outlet and the air inlet are provided on the second air collecting chamber; or, at least one second partition is provided in the first air collecting chamber, and at least one third partition is provided in the second air collecting chamber, the second partition and the third partition being arranged alternately along the first direction to divide the interior of the chamber into at least four chambers, with the air outlet and the air inlet provided on the same air collecting chamber, or the air outlet and the air inlet being provided on different air collecting chambers; the air duct from the air inlet to the air outlet circulates between the at least three chambers and the internal circulation channels in each heat exchange fin.
[0010] In particular, this application also provides a power conversion device, including a housing, the housing being divided into at least two cavities by a partition, the at least two cavities including a first cavity and a second cavity, the partition having a first opening and a second opening communicating with the first cavity and the second cavity, the power conversion device including a heat exchanger as described above, the heat exchanger being disposed in the first cavity or the second cavity, one of the first opening and the second opening communicating with an air inlet, and the other communicating with an air outlet.
[0011] According to one embodiment of the present invention, the angle between the first direction and the third direction is greater than or equal to 0° and less than or equal to 90°.
[0012] According to one embodiment of the present invention, a first fan is provided in the first cavity, and / or a second fan is provided in the second cavity.
[0013] According to one embodiment of the present invention, one of the first cavity and the second cavity is a power cavity and the other is a heat dissipation cavity; wherein, the power cavity is a sealed cavity and a first heating device is disposed inside it, the heat dissipation cavity is provided with a heat dissipation port communicating with the external environment, and a heat exchanger is disposed inside the heat dissipation cavity.
[0014] According to one embodiment of the present invention, a second heating device is provided in the heat dissipation cavity, and / or a heat sink for dissipating heat from the first heating device is provided in the heat dissipation cavity.
[0015] Compared with the prior art, the advantages and beneficial effects of the heat exchanger and power conversion device of this utility model patent application are as follows: The heat exchanger of this application has an air collection chamber set in the cavity of an air collection box. The air collection chamber is connected to the hollow heat exchange fins set on the outside through an air passage. When hot or cold air is introduced into the air inlet on the air collection chamber, the air enters the heat exchange fins through one air collection chamber, exchanges heat through the heat exchange fins, and then enters another air collection chamber before being discharged from the air outlet. Alternatively, it may undergo one or more cycles from the heat exchange fins to the next air collection chamber before being discharged from the air outlet. At this time, the air discharged from the air outlet is cold or hot air. The heat exchanger with this structure can exchange heat between the internal hot airflow and the outside to dissipate heat, and can also introduce external cold airflow into the interior to cool the interior. In this way, heat dissipation can be achieved quickly, and this heat exchanger is particularly suitable for heat dissipation needs in closed environments.
[0016] The heat exchanger described in this application is low in cost and has high reliability during long-term operation. This heat exchanger can be processed using common aluminum materials such as tri-series aluminum, and can achieve good heat exchange capacity without the need for other reactive metals such as copper, thus avoiding the galvanic corrosion problem caused by using different reactive metals simultaneously.
[0017] The power conversion device of this application has one of its first and second cavities as a relatively closed cavity, such as a power cavity, used to house electronic devices with high protection requirements, and the other as a cavity connected to the external environment, such as a heat dissipation cavity. Electronic devices such as power modules and circuit boards (PCB boards, PCBA boards, etc.) generate heat during operation. By using the heat exchanger mentioned above, the heat exchanger can act as a bridge to realize the inter-wall heat exchange between the internal circulating hot air in the closed cavity and the external circulating cold air, thereby reducing the cavity temperature of the closed cavity and dissipating heat for the electronic devices. In other words, heat exchange and heat dissipation can be achieved directly through internal circulation. While improving the heat dissipation effect, the sealing of the power cavity is not affected, so that the protection requirements of the electronic devices can be met, ensuring the overall reliability and safety of the equipment.
[0018] In addition, the heat exchanger is more flexible in its installation in the power conversion device, and can be arranged in a single cavity without occupying the space of two cavities at the same time, thus affecting the device layout. Attached Figure Description
[0019] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic diagram of the heat exchanger according to Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the heat exchanger according to Embodiment 2 of this utility model; Figure 3 This is a schematic diagram of the heat exchanger according to Embodiment 3 of this utility model; Figure 4 This is a side view of the power conversion device according to Embodiment 4 of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the power conversion device according to Embodiment 4 of the present invention; Figure 6 This is a schematic diagram of the gas flow channel in the heat dissipation cavity of the power conversion device according to Embodiment 4 of this utility model.
[0020] The attached figures are labeled as follows: 1. Gas collection box; 11. First gas collection chamber; 111. First chamber; 112. Second chamber; 12. Second gas collection chamber; 121. Third chamber; 122. Fourth chamber; 2. Heat exchange fins; 21. Internal circulation channel; 31. Air inlet; 32. Air outlet; 41. First partition; 42. Second partition; 43. Third partition; 5. Housing; 51. Power cavity; 52. Heat dissipation cavity; 6. Partition; 61. First opening; 62. Second opening; 71. First fan; 72. Second fan; 81. Power module; 82. Circuit board; 83. Heat sink in heat dissipation cavity; 84. High-power device. Detailed Implementation
[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0022] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0023] Example 1: This embodiment describes a heat exchanger, such as Figure 1 As shown, the device includes a gas collection box 1 and several heat exchange fins 2 arranged along a first direction on a first side of the gas collection box 1. An air outlet 32 and an air inlet 31 are formed along the first direction on a second side of the gas collection box 1. The first and second sides of the gas collection box 1 are two opposite sides, and the remaining geometric surfaces of the gas collection box 1 are closed. In this embodiment, the first direction is the length direction of the gas collection box 1, but it can also be other directions, such as the width direction of the gas collection box. Any direction can be set as needed, and all such directions should be included in the protection scope of this application.
[0024] Each heat exchange fin 2 is provided with an internal circulation channel 21. Each heat exchange fin 2 is open at one end facing the cavity of the gas collection box 1, and the remaining geometric surfaces are closed, forming the internal circulation channel 21 with one open end. The gas collection box 1 has a cavity inside, and the first side of the cavity of the gas collection box 1 that contacts the fins is provided with a through hole for connecting the cavity and the internal circulation channel 21, so that the internal circulation channel 21 is connected to the cavity of the gas collection box 1.
[0025] A first partition 41 is disposed within the cavity, and the first partition 41 is also disposed along the first direction within the cavity. The first partition 41 divides the cavity into two gas collecting chambers, referred to as the first gas collecting chamber 11 and the second gas collecting chamber 12. The plurality of heat exchange fins 2 are arranged in an array along the first direction, and the internal circulation channel 21 of each heat exchange fin 2 is connected to both the first gas collecting chamber 11 and the second gas collecting chamber 12.
[0026] Regarding a single heat exchange fin 2 among the plurality of heat exchange fins 2, its opening side is in contact with the first side of the gas collection box 1.
[0027] In this embodiment, the air inlet 31 is connected to the first air collection chamber 11, and the air outlet 32 is connected to the second air collection chamber 12.
[0028] In this embodiment, the air duct inside the heat exchanger, from the air inlet 31 to the air outlet 32, is as follows: air enters through the air inlet 31, then flows into the upper first air collecting chamber 11, then through the through-hole connecting the first air collecting chamber 11 and the inner circulation channel 21 into the inner circulation channel 21 within the heat exchange fins 2, then through the inner circulation channel 21 through the through-hole on the second air collecting chamber 12 into the second air collecting chamber 12, and finally exits through the air outlet 32. This reciprocating process allows for sufficient heat exchange between the internal and external airflows through the heat exchange fins 2, improving the heat exchanger's heat exchange capacity.
[0029] Example 2: This embodiment describes a heat exchanger, such as Figure 2 As shown, its main structure is basically the same as the heat exchanger described in Example 1, but there are still differences, the difference being the structure of the cavity inside the gas collection box 1.
[0030] The specific difference lies in the following: a second partition 42 is provided in the first gas collecting chamber 11, and a third partition 43 is provided in the second gas collecting chamber 12. The second partition 42 and the third partition are staggered along the first direction. It can be seen that the second partition 42 divides the first gas collecting chamber 11 into two parts (referred to as the first chamber 111 and the second chamber 112 for convenience in the following description), and the third partition 43 divides the second gas collecting chamber 12 into two parts (referred to as the third chamber 121 and the fourth chamber 122 for convenience in the following description). In summary, the interior of the chamber is divided into four chambers.
[0031] Depending on the partition arrangement in the first air collecting chamber 11 and the second air collecting chamber 12, the air outlet and the air inlet can be set on the same air collecting chamber, or the air outlet and the air inlet can be set on different air collecting chambers, so that the air duct from the air inlet to the air outlet can circulate between the internal circulation channels in the formed several chambers and each heat exchange fin. Specifically, the first air collecting chamber 11 is provided with at least one second partition 42, which is arranged along a first direction to divide the interior of the chamber into at least three chambers, and the air outlet 32 and the air inlet 31 are both provided on the first air collecting chamber 11; or, the second air collecting chamber 12 is provided with at least one third partition 43, which is arranged along a first direction to divide the interior of the chamber into at least three chambers, and the air outlet 32 and the air inlet 31 are both provided on the second air collecting chamber 12; or, the first air collecting chamber 11 is provided with at least one second partition 42, and the second air collecting chamber 12 is provided with at least one third partition 43, which are arranged alternately along a first direction to divide the interior of the chamber into at least four chambers, and the air outlet 32 and the air inlet 31 are provided on the same air collecting chamber, or the air outlet 32 and the air inlet 31 are provided on different air collecting chambers. The relationship between the chambers and the heat exchange fins 2 in the air collection box 1 is to limit the air duct from the air inlet 31 to the air outlet 32 to circulate between the internal circulation channels in at least three chambers and each heat exchange fin 2.
[0032] The air inlet 31 is connected to the first chamber 111 of the first air collecting chamber 11, and the air outlet 32 is connected to the fourth chamber 122 of the second air collecting chamber 12. The air outlet 32 is used to configure the air duct between the air inlet 31 and the air outlet 32 to circulate between the four chambers and the internal circulation channels 21 in each heat exchange fin 2. Specifically, the air duct inside the heat exchanger from the air inlet 31 to the air outlet 32 is as follows: air enters through the air inlet 31, then flows into the first chamber 111, then through the through hole in the first chamber 111 into the internal circulation channel 21 inside the heat exchange fins 2, then through the through hole on the first side of the third chamber 121 into the third chamber 121 of the second air collection chamber 12, then from the third chamber 121 into another part of the internal circulation channel 21 of the heat exchange fins 2, then through the corresponding part of the internal circulation channel 21 of the heat exchange fins 2 into the second chamber 112, then through the last part of the internal circulation channel 21 of the heat exchange fins 2 connected to the second chamber 112 into the fourth chamber 122, and finally is discharged from the air outlet 32 connected to the fourth chamber 122. In this reciprocating process, the airflow can enter each heat exchange fin 2 more evenly, so that the internal airflow and the external airflow can exchange heat more fully through the heat exchange fin 2, thereby further improving the heat exchange capacity of the heat exchanger.
[0033] Example 3: This embodiment describes a heat exchanger, such as Figure 3 As shown, its main structure is basically the same as the heat exchanger described in Example 1, but there are still differences, the difference being the structure of the cavity inside the gas collection box 1.
[0034] The specific difference is that a second partition 42 is provided in the first gas collecting cavity 11. The second partition 42 is arranged along the first direction and divides the first gas collecting cavity 11 into two parts, which are referred to as the first chamber 111 and the second chamber 112 for ease of description below. In summary, the cavity is divided into three chambers.
[0035] The air inlet 31 is connected to the first chamber 111 of the first air collecting chamber 11, and the air outlet 32 is connected to the second chamber 112 of the first air collecting chamber 11. The air outlet 32 is used to configure the air duct between the air inlet 31 and the air outlet 32 to circulate between the three chambers and the internal circulation channels 21 in each heat exchange fin 2.
[0036] Specifically, the airflow path inside the heat exchanger from the air inlet 31 to the air outlet 32 is as follows: air enters through the air inlet 31, then flows into the first chamber 111, then through the through-holes in the first chamber 111 into the internal circulation channel 21 within the heat exchange fins 2, then through the internal circulation channel 21 into the second air collection chamber 12 through the through-holes on the first side of the second air collection chamber 12, then through the through-holes on the first side of the second air collection chamber 12 again into the internal circulation channel 21 of another part of the heat exchange fins 2, then through the corresponding part of the internal circulation channel 21 into the second chamber 112, and finally exits through the air outlet 32 connected to the second chamber 112. This reciprocating process allows the airflow to enter each fin 2 more evenly, enabling more thorough heat exchange between the internal and external airflows through the heat exchange fins 2, thus improving the heat exchanger's heat exchange capacity.
[0037] Example 4: This embodiment describes a power conversion device, such as... Figure 4 and Figure 5 As shown, the device includes a housing 5, which is divided into at least two cavities by a partition 6. The at least two cavities include a first cavity and a second cavity. The partition has a first opening and a second opening that connect the first cavity and the second cavity. The power conversion device includes a heat exchanger as described in Embodiment 1. The heat exchanger is disposed in the first cavity or the second cavity. One of the first opening and the second opening is connected to an air inlet, and the other is connected to an air outlet.
[0038] In this embodiment, the first cavity can be a power cavity 51, and the second cavity can be a heat dissipation cavity 52. The power cavity 51 can be a sealed cavity, typically used to house devices with high protection requirements, such as first heat-generating devices (e.g., power modules, circuit boards, etc.). The power cavity 51 may not be a sealed cavity; specific configurations are optional and not limited here. The following description uses a sealed power cavity 51 as an example, but it does not constitute a limitation. The heat dissipation cavity 52 has a heat dissipation port communicating with the external environment. In this embodiment, the heat exchanger is disposed within the heat dissipation cavity. The angle between the first direction and a third direction is greater than or equal to 0° and less than or equal to 90°. In this embodiment, the third direction can be the height direction of the power conversion device. Correspondingly, the heat exchanger can be placed horizontally, vertically, or at any angle between horizontal and vertical relative to the power conversion device.
[0039] In the power cavity 51, the heat generated by the device is generally concentrated on the power module 81 or other impedance devices (such as circuit board 82). In this embodiment, a heat exchanger is used to conduct the heat in the power cavity 51 to the heat dissipation cavity 52 to exchange heat with the external environment for heat dissipation, thereby achieving efficient heat dissipation while ensuring the protection level requirements of the devices in the power cavity 51. In addition, in some devices, a second heat-generating device with a protection level requirement lower than that of the first heat-generating device and / or a heat generation greater than that of the first heat-generating device, such as a high-power device 84 (such as an inductor), is placed in the heat dissipation cavity 52, and / or a heat sink 83 is added to the heat dissipation cavity 52 to cool the power module 81, thereby helping to dissipate some of the heat in the power cavity 51, and further improving the cooling effect of the power cavity temperature.
[0040] The power conversion device of this embodiment includes a first fan 71 and a heat exchanger as described in Embodiment 1, wherein the heat exchanger is disposed in the heat dissipation cavity 52. The second side of the heat exchanger is attached to the partition 6, and a plurality of heat exchange fins 2 are located inside the heat dissipation cavity 52; the partition 6 has a first opening 61 and a second opening 62, the first opening 61 being connected to the air inlet 31, and the second opening 62 being connected to the air outlet 32; the first fan 71 is disposed in the power cavity 51 to accelerate the internal air circulation of the power cavity 51.
[0041] With the heat exchanger described above, placed inside the heat dissipation cavity 52, the hot airflow entering the heat exchanger is from the power cavity 51. This hot airflow undergoes heat exchange with the cold airflow in the heat dissipation cavity 52 via the heat exchange fins 2, resulting in cooling. The hot air then returns to the power cavity 51 for further cooling. This internal circulation mode allows for direct heat exchange and heat dissipation, improving heat dissipation while maintaining overall equipment reliability and safety. Simulation results show that, using the same type and number of fans, under certain power conditions (e.g., 300+ kW), with an external ambient temperature of 40°C, the temperature at the heat exchanger's internal circulation outlet 32 is approximately 50°C. This significantly meets the requirement that power devices generally have ambient temperatures below 85°C, greatly improving the overall heat dissipation capacity of the power conversion device, especially its ability to reduce the temperature of the power cavity 51.
[0042] In another embodiment, the heat exchanger can be placed inside the power cavity 51. In this case, the cold airflow entering the heat exchanger is from the heat dissipation cavity 52. The cold airflow undergoes indirect heat exchange with the hot airflow in the power cavity 51 through the heat exchange fins 2, thereby cooling the power cavity 51. The heated cold airflow then returns to the heat dissipation cavity and is discharged through the heat dissipation port. It can be seen that the installation and arrangement of the heat exchanger in the power conversion device is more flexible. It can be arranged in a single cavity without occupying the space of two cavities simultaneously, thus avoiding affecting the device layout.
[0043] In a preferred embodiment, the power conversion device further includes a second fan 72, which is used to drive the external air circulation of the heat exchange fins 2 of the heat exchanger. For example... Figure 6 As shown, the second fan 72 is preferably positioned below the heat exchange fins 2 of the heat exchanger, blowing air upwards to drive the external air to circulate rapidly, carrying away the heat on the heat exchange fins 2, and at the same time cooling the radiator 83 and high-power device 84 set above.
[0044] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.
Claims
1. A heat exchanger, characterized in that, The device includes a gas collection box and several heat exchange fins arranged along a first direction on a first side of the gas collection box. An air outlet and an air inlet are opened on a second side of the gas collection box along the first direction. The first side and the second side are two opposite sides. Each heat exchange fin is provided with an internal circulation channel. The gas collection box has a cavity inside. The internal circulation channel is connected to the cavity of the gas collection box. A first partition is arranged in the cavity along the first direction. The first partition divides the cavity into two gas collection chambers: a first gas collection chamber and a second gas collection chamber. The air duct inside the heat exchanger from the air inlet to the air outlet circulates between the two gas collection chambers and the internal circulation channels in each heat exchange fin.
2. The heat exchanger according to claim 1, characterized in that, Each heat exchange fin is open at one end of the cavity of the gas collection box, while the other geometric surfaces are closed, forming the internal circulation channel with one open end.
3. The heat exchanger according to claim 2, characterized in that, The first side of the cavity of the gas collection box that contacts the fins is provided with a through hole for connecting the cavity and the internal circulation channel.
4. The heat exchanger according to claim 1, characterized in that, One of the air outlet and the air inlet is connected to the first air collection chamber, and the other is connected to the second air collection chamber.
5. The heat exchanger according to claim 1, characterized in that, The first air collecting chamber is provided with at least one second partition, which is arranged along a first direction to divide the interior of the chamber into at least three chambers. The air outlet and air inlet are both located on the first air collecting chamber. Alternatively, the second air collecting chamber is provided with at least one third partition, which is arranged along a first direction to divide the interior of the chamber into at least three chambers. The air outlet and air inlet are both located on the second air collecting chamber. Alternatively, the first air collecting chamber is provided with at least one second partition, and the second air collecting chamber is provided with at least one third partition. The second and third partitions are arranged alternately along the first direction to divide the interior of the chamber into at least four chambers. The air outlet and air inlet are located on the same air collecting chamber, or the air outlet and air inlet are located on different air collecting chambers. The air duct from the air inlet to the air outlet circulates between the at least three chambers and the internal circulation channels in each heat exchange fin.
6. A power conversion device, comprising a housing, the housing being divided into at least two cavities by a partition, the at least two cavities including a first cavity and a second cavity, characterized in that, The partition has a first opening and a second opening that connect the first cavity and the second cavity. The power conversion device includes a heat exchanger as described in any one of claims 1 to 5. The heat exchanger is disposed in the first cavity or the second cavity. One of the first opening and the second opening is connected to the air inlet, and the other is connected to the air outlet.
7. The power conversion device according to claim 6, characterized in that, The angle between the first direction and the third direction is greater than or equal to 0° and less than or equal to 90°.
8. The power conversion device according to claim 6, characterized in that, A first fan is provided in the first cavity, and / or a second fan is provided in the second cavity.
9. The power conversion device according to claim 6 or 8, characterized in that, The first cavity and the second cavity are respectively a power cavity and a heat dissipation cavity. The power cavity is a sealed cavity and a first heating device is installed inside it. The heat dissipation cavity is provided with a heat dissipation port that communicates with the external environment, and a heat exchanger is installed inside the heat dissipation cavity.
10. The power conversion device according to claim 9, characterized in that, A second heating element is provided inside the heat dissipation cavity, and / or a heat sink for dissipating heat from the first heating element is provided inside the heat dissipation cavity.