Heat exchanger and power conversion device

Abstract

The utility model discloses a heat exchanger and power conversion device, including along the first direction setting's multiple fins and along the second direction opposite setting in each the fin both ends's first gas collection cavity and second gas collection cavity, wherein, the fin is structured as both ends communication's flow guide piece, the first gas collection cavity with the second gas collection cavity passes through the fin and keeps communication, and the first gas collection cavity along the both ends of first direction respectively is provided with the air inlet and the air outlet for with target cavity communication. This heat exchanger greatly improved the overall heat dissipation capacity of power conversion device, especially the ability of reducing cavity temperature, its installation setting is more flexible, can be arranged in single cavity alone, need not simultaneously occupy two cavity space, is favorable to device layout.

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, the core grid-connecting components such as inverters or energy storage converters are increasingly showing a trend of high power density and miniaturization, which puts forward increasingly 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 a fan. Alternatively, extended surface heat exchangers can be added on both sides between two chambers, such as between the power chamber and the heat dissipation chamber (see...). Figure 1 Alternatively, the power cavity and the heat dissipation cavity can be connected at both ends for heat dissipation via a microchannel heat exchanger (see...). Figure 2 ).

[0004] However, the above method has two major drawbacks. First, it occupies the space of two cavities at the same time, which affects the layout and installation of the components inside the cavity. Second, the heat dissipation capacity is limited. Due to its large size, it is not convenient to lay out the components along the width of the chassis. It can only rely on a few external fans to blow air for heat dissipation, which restricts its ability to reduce the cavity temperature. Utility Model Content

[0005] The purpose of this invention is to provide a heat exchanger and a power conversion device. By optimizing the heat exchanger structure, the overall heat dissipation capacity of the power conversion device is greatly improved, especially the ability to reduce the cavity temperature, without affecting the layout of the internal components.

[0006] The objective of this utility model is achieved through the following technical solution: A heat exchanger includes a plurality of fins arranged along a first direction, and a first gas collecting chamber and a second gas collecting chamber arranged opposite to each of the fins along a second direction. The fins are configured as flow guides with both ends connected. The first air collection chamber and the second air collection chamber are kept connected by the fins. The first air collection chamber is provided with an air inlet and an air outlet at both ends along the first direction for communicating with the target chamber.

[0007] In an optional embodiment, the first air collecting chamber has an air inlet and an air outlet on the side facing the target chamber, and the first air collecting chamber has at least one first hole on the side away from the target chamber to communicate with the end of each fin facing the target chamber. The second gas collecting chamber has at least one second hole on the side facing the target cavity to communicate with the end of each fin away from the target cavity.

[0008] In an alternative embodiment, at least one first baffle is provided inside the first gas collecting chamber.

[0009] In one alternative embodiment, at least one second partition is provided in the second gas collection chamber, and the second partition and the first partition are arranged alternately along a first direction.

[0010] In one alternative, the heat exchanger may be made of materials including, but not limited to, ternary aluminum.

[0011] A power conversion device includes a cavity, wherein a cavity partition is disposed within the cavity to divide it into a first cavity and a second cavity, and the cavity partition is provided with a first opening and a second opening that connect the first cavity and the second cavity. It also includes the heat exchanger described above, which is disposed in the first or second cavity, with its air inlet and air outlet respectively connected to the first opening and the second opening.

[0012] In one alternative embodiment, a first fan is disposed in the first cavity, and / or a second fan is disposed in the second cavity.

[0013] In one alternative embodiment, one of the first cavity and the second cavity is a power cavity, and the other is 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. The heat exchanger is installed inside the heat dissipation cavity.

[0014] In one alternative embodiment, a second heating device is disposed within the heat dissipation cavity, and / or a heat sink for dissipating heat from the first heating device is disposed within the heat dissipation cavity.

[0015] In one alternative scheme, the angle between the first direction and the third direction is greater than or equal to 0° and less than or equal to 90°.

[0016] Compared with the prior art, the beneficial effects of this utility model include at least the following: 1. This heat exchanger greatly improves the overall heat dissipation capacity of the power conversion device, especially its ability to reduce cavity temperature.

[0017] 2. The heat exchanger installation is more flexible and can be arranged in a single cavity without occupying the space of two cavities at the same time, which is beneficial to the layout of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a power conversion device using a heat exchanger with extended surfaces on both sides in the prior art.

[0019] Figure 2 This is a schematic diagram of a power conversion device using a microchannel heat exchanger in the prior art.

[0020] Figure 3 This is a three-dimensional structural diagram of the heat exchanger of this utility model.

[0021] Figure 4 This is a schematic diagram of the connection between the heat exchanger and the target cavity of this utility model.

[0022] Figure 5 This is a schematic diagram of the connection between the heat exchanger and the target cavity after adding a second partition.

[0023] Figure 6 This is a schematic diagram of a power conversion device in which the heat exchanger is installed inside the heat dissipation cavity.

[0024] Figure 7 yes Figure 6 A schematic diagram of the three-dimensional structure.

[0025] Figure 8 This is a schematic diagram of a power conversion device in which a heat exchanger is installed inside a power chamber.

[0026] In the diagram: 1. Heat exchanger; 11. Fins; 12. First air collection chamber; 13. Second air collection chamber; 14. Air inlet; 15. Air outlet; 16. First baffle; 17. Second baffle; 2. Cavity; 21. First cavity; 22. Second cavity; 221. Heat dissipation vent; 23. Cavity partition; 231. First opening; 232. Second opening; 4. First fan; 5. Second fan; 6. First heating element; 7. Second heating element; 8. Radiator; Detailed Implementation Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0027] The terms used to describe position and direction in this utility model are illustrated with the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this utility model.

[0028] by Figure 7For example, the first, second, and third directions involved in this utility model can be the width direction, length direction, and height direction of the power conversion device, respectively. In this case, the heat exchanger is placed horizontally along the width direction of the power conversion device. However, this is only an example and is not specifically limited. Each direction can be adjusted as needed.

[0029] This utility model discloses a heat exchanger 1, which is designed for cooling the cavity of a power conversion device, such as cooling the power cavity, and can also be used for cooling other similar cavity / chamber structures, without any specific limitations.

[0030] See Figure 3 and Figure 4 As shown, the heat exchanger 1 includes a plurality of fins 11 arranged in an array along a first direction, and a first gas collecting chamber 12 and a second gas collecting chamber 13 arranged opposite to each other at both ends of each fin 11 along a second direction.

[0031] The fin 11 is configured as a flow guide with both ends connected, and the first air collection chamber 12 and the second air collection chamber 13 are kept in communication through the fin 11. Furthermore, the first air collection chamber 12 is provided with an air inlet 14 and an air outlet 15 at both ends along the first direction for communicating with a target chamber (e.g., the power chamber of a power conversion device).

[0032] Specifically, the first air collecting chamber 12 has an air inlet 14 and an air outlet 15 on the side facing the target chamber, and at least one first hole (hidden, not shown) on the side facing away from the target chamber to communicate with the end of each fin 11 facing the target chamber. The remaining sides of the first air collecting chamber 12 are closed. The second air collecting chamber 13 has at least one second hole (hidden, not shown) on the side facing the target chamber to communicate with the end of each fin 11 facing away from the target chamber. The remaining sides of the second air collecting chamber 13 are closed. During heat exchange, the fluid (such as hot air) in the target chamber enters the first air collecting chamber 12, fins 11, and second air collecting chamber 13 through the air inlet 14, and cools down after heat exchange with the fluid in the external environment (such as cold air from the external environment) through the fins 11. It then returns to the target chamber through the air outlet 15, thus circulating and reducing the chamber temperature.

[0033] It is understandable that, in some alternative options, the second air chamber 13 may be provided with an air inlet 14 and an air outlet 15 at both ends along the first direction, which will not be elaborated here.

[0034] In some embodiments, at least one first baffle 16 is provided in the first air collection chamber 12. The first baffle 16 is used to prevent the fluid in the target chamber, such as hot air, from flowing directly and rapidly to the air outlet 15. By blocking the flow, the hot air is forced to change its diffusion direction, thereby making full contact with the fins 11 to achieve a uniform flow effect and improving the heat exchange efficiency and capacity of the heat exchanger 1.

[0035] As an example, from Figure 4As can be seen, a first baffle 16 is provided in the middle of the first air collecting chamber 12. Its presence prevents the fluid in the target chamber, such as hot air, from directly diffusing towards the air outlet 15 after entering the first air collecting chamber 12 from the air inlet 14. Instead, it can only directly diffuse through the inner channel of the fin 11 or towards the first baffle 16 and then enter the second air collecting chamber 13 through the inner channel of the fin 11. The hot air in the second air collecting chamber 13 will again directly diffuse through the inner channel of the fin 11 or diffuse away from the first baffle 16 and then return to the first air collecting chamber 12 through the inner channel of the fin 11. During this process, the hot air undergoes indirect heat exchange with the cold air in the external environment within the fin 11, reducing its temperature. Finally, it returns to the target chamber through the air outlet 15, thus achieving the function of reducing the chamber temperature.

[0036] Furthermore, at least one second baffle 17 is provided in the second air collection chamber 13, and the second baffle 17 and the first baffle 16 are arranged alternately along the first direction. By setting multiple baffles, the flow path of hot air and the heat exchange time are extended, thereby further improving the heat exchange efficiency and capacity of the heat exchanger 1.

[0037] As an example, from Figure 5 As can be seen, the first air collecting chamber 12 is provided with two first baffles 16 spaced apart along the first direction, and the second air collecting chamber 13 is provided with a second baffle 17 at the middle position, with the second baffle 17 located between the two first baffles 16. This arrangement allows the fluid in the target chamber, such as hot air, to form a serpentine flow and / or diffusion path between the first air collecting chamber 12 and the second air collecting chamber 13 after entering from the air inlet 14, thereby fully exchanging heat with the cold air in the external environment and further enhancing the heat exchange efficiency and capacity of the heat exchanger 1.

[0038] In some embodiments, the heat exchanger 1 is preferably made of tri-series aluminum, which is inexpensive and can achieve good heat exchange capacity without the use of other reactive metals such as copper. This avoids the galvanic corrosion problem that occurs when different reactive metals are used together, thus improving long-term reliability. Alternatively, the heat exchanger 1 can also be made of copper, silver, or their alloys; there are no specific limitations.

[0039] Furthermore, this utility model also discloses a power conversion device, including a cavity 2, within which a cavity partition 23 is provided to divide it into a first cavity 21 and a second cavity 22, and the cavity partition 23 is provided with a first opening 231 and a second opening 232 connecting the first cavity 21 and the second cavity 22. Additionally, the device also includes the aforementioned heat exchanger 1, which is disposed within the first cavity 21 or the second cavity 22, with its air inlet 14 and air outlet 15 correspondingly connected to the first opening 231 and the second opening 232, respectively. In this application, the heat exchanger 1 is preferably arranged along the width direction of the device to reduce the space occupied by the heat dissipation area, thereby reducing the size of the device.

[0040] Furthermore, a first fan 4 is provided in the first cavity 21, and / or a second fan 5 is provided in the second cavity 22. The fans accelerate the flow of fluid inside and / or outside the heat exchanger 1, thereby improving the heat exchange efficiency and capacity of the heat exchanger 1.

[0041] See Figure 6 and Figure 7 As shown, in a specific embodiment, the target cavity is the first cavity 21, which can be a power cavity, and a first heating device 6 and a first fan 4 are disposed inside it. The second cavity 22 can be a heat dissipation cavity, which is provided with a heat dissipation port 221, and a heat exchanger 1 and a second fan 5 are disposed inside it. In this application, the power cavity is preferably a sealed cavity to accommodate heating devices with high protection requirements, such as power modules, but it is not limited to this, and the power cavity may not be a sealed cavity. The first heating device 6 may include a power module, and may also include a circuit board. The first fan 4 is an internal circulation fan, used to realize air circulation in the first cavity 21, thereby achieving the purpose of uniform flow and cooling. The second fan 5 is an external cooling fan, used to draw in cold air from the outside environment to exchange heat with the heat exchanger 1.

[0042] During operation, the first heating element 6 generates heat within the first cavity 21. The first fan 4 draws the hot air from the first cavity 21 into the heat exchanger 1 through the first opening 231 and the air inlet 14. Simultaneously, the second fan 5 draws in cool air from the outside environment and applies it to the heat exchanger 1, causing indirect heat exchange between the hot air and the cool air from the outside environment. The cool air from the outside environment carries away the heat from the heat exchanger 1 and is discharged to the outside through the heat dissipation port 221. The cooled hot air returns to the first cavity 21 through the air outlet 15 and the second opening 232. This cycle continues to cool the first cavity 21, ensuring that the airflow within the sealed power cavity does not need to directly contact the external environment. Cooling within the cavity can be achieved solely through internal circulation, ensuring effective heat dissipation while meeting the corresponding high protection level requirements.

[0043] Furthermore, a second heating device 7 is disposed within the heat dissipation cavity, and / or a heat sink 8 is disposed within the heat dissipation cavity for dissipating heat from the first heating device 6. In this application, the second heating device 7 may be a device with a heat generation greater than that of the power module and / or a protection level requirement lower than that of the power module, such as a power inductor, while the heat sink 8 may be a power module heat sink. By placing the second heating device 7 externally within the heat dissipation cavity, and / or by using the heat sink 8 to conduct some of the heat from the first heating device 6 to the heat dissipation cavity, the accumulation of heat in the power cavity, i.e., the first cavity 21, is further reduced, which helps to dissipate heat and cool down the first cavity 21.

[0044] In a preferred example, the second fan 5, heat exchanger 1, radiator 8, and second heating element 7 are arranged sequentially from bottom to top along a third direction in the heat dissipation cavity. The second fan 5 draws in cool air from the outside environment, which first acts on the heat exchanger 1. After exchanging heat with the heat exchanger 1, it continues to dissipate heat from the radiator 8. Although the air temperature rises, it can still meet the cooling requirements of the second heating element 7, resulting in a better overall heat dissipation effect for the device.

[0045] See Figure 8 As shown, in another specific embodiment, the first cavity 21 is a power cavity, and a first heating device 6, a first fan 4, and a heat exchanger 1 are disposed inside it. The second cavity 22 is a heat dissipation cavity, and a heat dissipation port 221 is provided on the heat dissipation cavity, and a second fan 5 is disposed inside it.

[0046] It is understood that, unlike the power conversion device described above, in this example, the target cavity is the second cavity, i.e., the heat dissipation cavity. The air input into the heat exchanger 1 is no longer the hot air in the first cavity 21, but the cool air from the outside environment in the second cavity 22. Specifically, the second fan 5 (the position and angle can be adjusted according to actual needs) can input the cool air from the outside environment into the heat exchanger 1 through the first opening 231 and the air inlet 14. After undergoing heat exchange with the hot air in the first cavity 21, the cool air carries away the heat from the first cavity 21. The heated cool air from the outside environment returns to the second cavity 22 through the air outlet 15 and the second opening 232 and is discharged outwards. This cycle continues to cool the first cavity 21.

[0047] In some embodiments, the angle between the first direction and the third direction is greater than or equal to 0° and less than or equal to 90°, which allows the heat exchanger 1 to be placed vertically, horizontally, or at an angle between the two in the power conversion device. In this application, the angle between the first direction and the third direction is preferably 90°.

[0048] by Figure 7 Taking the power conversion device as an example, simulation evaluation shows that, using the same type and number of fans, under the condition of the device's overall power (e.g., 300+KW), with an external ambient temperature of 40℃, the temperature at the internal circulation outlet 15 of the heat exchanger is approximately 50℃. This greatly meets the requirement that the ambient temperature of the power module is generally below 85℃, significantly improving the overall heat dissipation capacity of the device, especially its ability to reduce the temperature of the power cavity. Furthermore, placing the heat exchanger 1 separately in the heat dissipation cavity eliminates the need to occupy the space of two cavities 2 simultaneously, which is more conducive to device layout.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A heat exchanger, characterized in that, It includes a plurality of fins (11) arranged along a first direction, and a first gas collecting chamber (12) and a second gas collecting chamber (13) arranged opposite to each of the fins (11) along a second direction; The fin (11) is configured as a flow guide with both ends connected. The first air collection chamber (12) and the second air collection chamber (13) are connected by the fin (11). The first air collection chamber (12) is provided with an air inlet (14) and an air outlet (15) for communicating with the target chamber at both ends along the first direction.

2. The heat exchanger according to claim 1, characterized in that, The first air collecting chamber (12) has an air inlet (14) and an air outlet (15) on the side facing the target cavity. The first air collecting chamber (12) has at least one first hole on the side away from the target cavity to communicate with the end of each fin (11) facing the target cavity. The second gas collection chamber (13) has at least one second hole on the side facing the target cavity to communicate with the end of each fin (11) away from the target cavity.

3. The heat exchanger according to claim 1 or 2, characterized in that, At least one first baffle (16) is provided inside the first gas collecting chamber (12).

4. The heat exchanger according to claim 3, characterized in that, The second gas collection chamber (13) is provided with at least one second partition (17), and the second partition (17) and the first partition (16) are arranged alternately along the first direction.

5. The heat exchanger according to claim 1 or 2, characterized in that, The heat exchanger (1) is made of materials including but not limited to tri-series aluminum.

6. A power conversion device, characterized in that, Includes a cavity (2), wherein a cavity partition (23) is provided inside the cavity (2) to divide it into a first cavity (21) and a second cavity (22), and the cavity partition (23) is provided with a first opening (231) and a second opening (232) connecting the first cavity (21) and the second cavity (22); It also includes a heat exchanger (1) as described in any one of claims 1-5, wherein the heat exchanger (1) is disposed in a first cavity (21) or a second cavity (22), and its air inlet (14) and air outlet (15) are respectively connected to the first opening (231) and the second opening (232).

7. The power conversion device according to claim 6, characterized in that, A first fan (4) is provided in the first cavity (21), and / or a second fan (5) is provided in the second cavity (22).

8. The power conversion device according to claim 6 or 7, characterized in that, One of the first cavity (21) and the second cavity (22) is a power cavity, and the other is a heat dissipation cavity; The power cavity is a sealed cavity and a first heating device (6) is provided inside it. The heat dissipation cavity is provided with a heat dissipation port (221) that communicates with the external environment. The heat exchanger (1) is located inside the heat dissipation cavity.

9. The power conversion device according to claim 8, characterized in that, The heat dissipation cavity is provided with a second heating device (7), and / or the heat dissipation cavity is provided with a heat sink (8) for dissipating heat from the first heating device (6).

10. 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°.

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