Heat dissipation device and power conversion apparatus

Abstract

Disclosed in the present application is a heat dissipation device, comprising an evaporation cavity, heat dissipation fins and a connecting portion, wherein the evaporation cavity is of a cavity structure which is provided with a butt-joint port; several heat dissipation fins are provided at intervals, and each heat dissipation fin is internally provided with a first cavity having an opening in at least one side; the connecting portion is arranged between the evaporation cavity and the heat dissipation fins, and two sides of the connecting portion are respectively butt-joined to the butt-joint port and the openings of the first cavities in a sealed manner; and the evaporation cavity is in communication with each first cavity, and the evaporation cavity and the first cavities are partially filled with a phase-change working medium. In the present application, the two sides of the connecting portion are in communication with and are butt-joined to the evaporation cavity and the plurality of heat dissipation fins, thereby meeting a heat dissipation requirement. Further disclosed in the present application is a power conversion apparatus.

Description

A heat dissipation device and power conversion equipment

[0001] This application claims priority to Chinese Patent Application No. 2024230728680, filed on December 11, 2024, entitled "A Heat Dissipation Device and Power Conversion Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of heat dissipation technology for power equipment, and in particular to a heat dissipation device and a power conversion device. Background Technology

[0003] Power conversion equipment is used to convert electrical signals. It typically has a sealed cavity, and as the load demands of these equipment increase, the number of power and magnetic components inside also grows. However, most power conversion equipment still uses traditional heat conduction for heat dissipation, lacking new heat dissipation structures adapted to these devices. With the continuous development of internal components, the existing heat dissipation structures struggle to meet the cooling requirements of these power and magnetic components. Furthermore, existing heat dissipation devices suffer from technical problems related to insufficient reliability in the connection between the evaporation chamber and the heat sink fins.

[0004] Application content

[0005] The purpose of this application is to provide a heat dissipation device with higher reliability in the connection between the evaporation chamber and the heat dissipation fins. The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0006] Another objective of this application is to provide a power conversion device that includes the above-mentioned heat dissipation device.

[0007] A heat dissipation device includes an evaporation chamber, heat dissipation fins, and a connecting part. The evaporation chamber is a cavity structure with an interface. Several heat dissipation fins are spaced apart. A first cavity is provided inside the heat dissipation fins. A working fluid flow channel is provided inside the connecting part. The interface is connected to the first cavity through the working fluid flow channel. A portion of the evaporation chamber and the first cavity are filled with a phase change working fluid.

[0008] Optionally, in the above-mentioned heat dissipation device, the connecting part includes a plate and a plurality of protrusions disposed on the plate, the protrusions extending in a direction away from the evaporation chamber; the working fluid flow channel passes through the plate and the protrusions; one end of the first cavity opening of the heat dissipation fin is inserted into the protrusion.

[0009] Optionally, in the above-mentioned heat dissipation device, a cover plate is also provided at the interface of the evaporation chamber. The cover plate covers the interface and is provided with several connecting holes. The connecting part is stacked with the cover plate, and the first cavity is connected to the evaporation chamber through the working fluid flow channel and the connecting holes.

[0010] Optionally, in the above heat dissipation device, a connecting groove is provided in the side wall surrounding the protrusion, the opening of the connecting groove is disposed away from the evaporation cavity, and the side wall at one end of the opening of the first cavity of the heat dissipation fin is inserted into the connecting groove.

[0011] Alternatively, one end of the opening of the first cavity of the heat sink fins can be inserted into the working fluid flow channel.

[0012] Alternatively, the end of the protrusion facing away from the evaporation cavity can be inserted into the first cavity opening of the heat dissipation fins.

[0013] Optionally, in the above-mentioned heat dissipation device, the protrusion is an annular protrusion structure formed by four plates.

[0014] Alternatively, the protrusion can be a groove-shaped protrusion structure formed by two plates spaced apart.

[0015] Optionally, in the above-mentioned heat dissipation device, the heat dissipation fins are connected to the connecting surface.

[0016] Optionally, the above-mentioned heat dissipation device further includes a manifold, in which a second cavity is provided, and the second cavity is connected to the interface through the first cavity and the connecting part on the manifold.

[0017] Optionally, in the above-mentioned heat dissipation device, a plurality of turbulence columns are provided at intervals inside the first cavity, and the turbulence columns are fixedly connected to at least one inner wall of the first cavity.

[0018] And / or, the inner wall of the first cavity is provided with a capillary layer;

[0019] And / or, the outer walls of adjacent heat dissipation fins are connected by corrugated teeth.

[0020] Optionally, in the above-mentioned heat dissipation device, the evaporation chamber is provided with a connection interface on each of the opposite sides, the heat dissipation fins are arranged opposite each other on both sides of the evaporation chamber, and each connection interface is sealed and connected to the first cavity of the heat dissipation fins through a connecting part.

[0021] A power conversion device includes a housing, the housing being divided into a third cavity and a fourth cavity by a first wall, a plurality of power devices being disposed in the third cavity, the power devices being disposed on the evaporation cavity of the heat dissipation device provided in any of the above specific embodiments.

[0022] Optionally, in the above power conversion device, some or all of the heat dissipation fins are located in the fourth cavity; the third cavity and the fourth cavity are arranged along the first direction, or the third cavity and the fourth cavity are arranged along the second direction;

[0023] The fourth cavity has an air vent and several air supply devices.

[0024] The heat dissipation device provided in this application includes an independently configured evaporation chamber, heat dissipation fins, and a connecting part, which are assembled to form a sealed cavity structure and filled with a phase change working fluid to achieve heat exchange. The connecting part ensures that the evaporation chamber and the heat dissipation fins do not directly contact each other, but are indirectly connected through a working fluid flow channel within the connecting part. This structural form allows the evaporation chamber and the heat dissipation fins to be designed independently, meaning that the assembly connection does not need to be considered. The connecting part in this application ensures the reliability of the connection between the evaporation chamber and the heat dissipation fins.

[0025] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some specific embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 is a schematic diagram of the heat dissipation device structure provided in a specific embodiment of this application;

[0028] Figure 2 is an assembly drawing of Figure 1;

[0029] Figure 3a is a schematic diagram of the AA cross-sectional structure in Figure 1;

[0030] Figure 3b is a schematic diagram of the contact structure between the protrusion and the inner wall of the heat sink fins;

[0031] Figure 4 is a schematic diagram of the BB cross-sectional structure in Figure 1;

[0032] Figure 5a is a schematic diagram of the structure with a connecting groove on the protrusion;

[0033] Figure 5b is a detailed structural diagram of the connecting groove;

[0034] Figure 6a is a schematic diagram of another configuration of the heat dissipation device;

[0035] Figure 6b is a schematic diagram of another structural form that distinguishes the protrusion from Figure 6a;

[0036] Figure 7a is a schematic diagram of a heat dissipation device with a cover plate installed in the evaporation chamber;

[0037] Figure 7b is a detailed structural diagram of a single protrusion in Figure 7a;

[0038] Figure 8 is a schematic diagram of a heat dissipation device including a convergence zone;

[0039] Figure 9 is a schematic diagram of the AA cross-sectional structure in Figure 8;

[0040] Figure 10 is a schematic diagram of the BB cross-sectional structure in Figure 8;

[0041] Figure 11 is a schematic diagram of the internal structure of the heat sink fins with turbulence-dissipating columns;

[0042] Figure 12 is a schematic diagram of a heat sink fin structure with corrugated teeth;

[0043] Figure 13 is a schematic diagram of the capillary layer inside the heat sink fins;

[0044] Figure 14 is a schematic diagram of the capillary layer inside the first cavity;

[0045] Figure 15 is a schematic diagram of the structure with heat dissipation fins on both sides of the evaporation chamber;

[0046] Figure 16 is a schematic diagram of the power conversion device;

[0047] Figure 17 is a schematic diagram of another power conversion device;

[0048] Figure 18 is a right-side view of Figure 16.

[0049] Wherein, 10-evaporation chamber; 110-interface; 120-cover plate; 1210-connecting hole; 20-heat dissipation fins; 210-first cavity; 220-corrugated teeth; 30-connecting part; 310-plate; 320-protrusion; 330-connecting groove; 340-working fluid flow channel; 40-combining cavity; 410-second cavity; 50-turbulence column; 60-capillary layer; 70-shell; 710-first wall surface; 720-third cavity; 730-fourth cavity; 740-second wall surface; 750-fifth cavity; 760-sixth cavity; 770-power device; 780-air supply device; 790-magnetic device. Detailed Implementation

[0050] The core of this application is to disclose a heat dissipation device with high heat dissipation efficiency that can be adapted to power conversion equipment.

[0051] Another key aspect of this application is to provide a power conversion device that includes the aforementioned heat dissipation device.

[0052] To enable those skilled in the art to better understand the present application, specific embodiments of the present application will be described below with reference to the accompanying drawings. Furthermore, the specific embodiments shown below do not limit the scope of the application as described in the claims. Additionally, the entirety of the configurations represented in the following specific embodiments is not limited to those necessary for the solution described in the claims.

[0053] As shown in Figures 1-16, the heat dissipation device provided in this specific embodiment mainly includes an evaporation chamber 10, heat dissipation fins 20, and a connecting part 30 to form a sealed cavity structure. A phase change working fluid is added inside to enable the heat dissipation device to have heat exchange capability. Specifically, the evaporation chamber 10 is a cavity structure with a connecting interface 110. It should be noted that the evaporation chamber 10 can be formed by splicing multiple plates or it can be a one-piece molded structure. Except for the area where the connecting interface 110 is opened, the other parts of the cavity structure of the evaporation chamber 10 are in a sealed state. The connecting interface 110 is connected to other cavity structures. The connecting interface 110 is preferably a regular opening structure to facilitate connection and docking. Here, the regular opening structure specifically refers to the connecting interface 110 being a rectangle, parallelogram, or circle, etc., which makes the connecting interface 110 easy to process and also facilitates tight docking of the surrounding structures, thus maintaining the sealing effect of the cavity structure.

[0054] Based on this, several heat dissipation fins 20 are spaced apart, where "several" means that at least one heat dissipation fin 20 is provided. It should be noted that each heat dissipation fin 20 has a first cavity 210 inside, and at least one side of the first cavity 210 is open to allow other structural components to communicate with its interior. Correspondingly, the connecting part 30 is used to connect the evaporation chamber 10 and each heat dissipation fin 20, and to seal the cavity structure of the evaporation chamber 10 and the first cavity 210 on the heat dissipation fin 20, so that the phase change working fluid can move smoothly between the evaporation chamber 10 and the heat dissipation fin 20. Specifically, the connecting part 30 has a working fluid flow channel 340 inside, which opens on both sides to connect the interface 110 of the evaporation chamber 10 with the opening of the first cavity 210. One side opening of the working fluid flow channel 340 matches the configuration of the interface 110 so that the connecting part 30 can fit snugly against the interface 110 and be fixedly connected to the evaporation chamber 10. Here, "snugly" specifically means that after the connecting part 30 is connected to the interface 110, the recessed interface 110 on the wall of the evaporation chamber 10 is filled and completed, so that the side of the evaporation chamber 10 can maintain a flat and continuous structure. The other side of the connecting part 30 is used to seal and connect with the opening of the first cavity 210 on the heat sink fin 20 to achieve communication between the evaporation chamber 10 and each first cavity 210.

[0055] It should be noted that the connection part 30 ensures that the evaporation chamber 10 and the heat dissipation fins 20 do not come into direct contact, but are indirectly connected through the working fluid flow channel 340 on the connection part 30. This structural form optimizes the structural design of the evaporation chamber 10 and the heat dissipation fins 20, meaning that the two do not need to consider the assembly connection structure, thereby ensuring the heat dissipation effect of the evaporation chamber and the heat dissipation fins, and thus ensuring the overall heat dissipation efficiency of the heat dissipation device. Specifically, for the connection part 30, it only needs to be provided with regular mating interfaces 110 on the cavity structure to ensure a sealed connection with the connection part 30; while the heat dissipation fins 20 are relatively independent structures, and the connection part 30 can also first mate with each heat dissipation fin 20, and after checking the airtightness of the connection part 30 and the first cavity 210, it can then be sealed with the mating interfaces 110. The connection part 30 is provided so that each heat dissipation fin 20 is independent of the structure of the evaporation chamber 10, and the connection part 30 can be provided with a modular assembly connection structure with each heat dissipation fin 20 to facilitate inspection and replacement and improve the maintenance efficiency of the equipment.

[0056] In some specific embodiments of this application, the connecting portion 30 includes a plate 310 and a plurality of protrusions 320 disposed on the plate 310. The protrusions 320 extend in a direction away from the evaporation chamber 10; the working fluid flow channel 340 is disposed through the plate 310 and the protrusions 320, and one end of the opening of the first cavity 210 of the heat dissipation fin 20 is inserted into the protrusions 320.

[0057] Preferably, each protrusion 320 has the same structure. It should be noted that the protrusion 320 corresponds to the heat dissipation fins 20 and is sealed to the opening of the first cavity 210. The protrusion 320 accurately identifies the installation position of the heat dissipation fins 20, reducing the difficulty of installing the heat dissipation fins 20. Simultaneously, the protrusion 320 provides a more convenient sealing connection structure for the heat dissipation fins 20. In some preferred embodiments of this application, each protrusion 320 has a working fluid flow channel 340. The working fluid flow channel is a through-hole structure that passes through the protrusion 320 and the plate 310 along the direction from the evaporation chamber 10 toward the first cavity 210. The working fluid flow channel 340 connects the evaporation chamber 10 and the first cavity 210. Based on this, when the heat dissipation fins 20 are assembled with the connecting part 30, as shown in Figure 3a, the heat dissipation fins 20 can be inserted into the working fluid flow channel 340 within the protrusion 320. At this time, the inner wall of the working fluid flow channel 340 contacts the outer wall of the heat dissipation fins 20, achieving surface contact. Then, the two contacting walls can be welded to achieve a larger contact area and improve the connection stability of the heat dissipation device. As shown in Figure 3a, in order to reduce the flow resistance caused by the stepped structure between the heat dissipation fins 20 and the inner wall of the working fluid flow channel 340 during the working fluid flow process, the depth to which the heat dissipation fins 20 are inserted into the working fluid flow channel 340 is equal to the length of the working fluid flow channel 340 in the direction along the evaporation chamber 10 toward the first cavity 210. The structure of the heat dissipation fins 20 being connected by inserting them into grooves not only provides stable support points for the heat dissipation fins 20 through the protrusions 320, but also ensures that each sidewall of the opening end of a single first cavity 210 is fitted with two opposing inner walls within the grooves on the protrusions 320, achieving a seal over a relatively long fitting distance. This improves the sealing effect after the first cavity 210 is connected to the connecting part 30. It should be noted that the grooves for inserting the heat dissipation fins 20 into the protrusions 320 of the connecting part 30 can be machined using methods such as die casting or drawing.

[0058] Similarly, as shown in Figure 3b, the protrusion 320 can be passed through the opening of the heat dissipation fin 20 and then inserted into the first cavity 210 of the heat dissipation fin 20. At this time, the outer wall of the protrusion 320 contacts the inner wall of the heat dissipation fin 20, achieving surface contact. Then, the two contacting walls can be welded to achieve a larger contact area, so that the opening of the first cavity 210 is connected to the groove structure of the protrusion 320.

[0059] In another connection method, as shown in Figure 5, the connecting part 30 protrudes on the surface facing away from the evaporation chamber 10 to form a protrusion 320, which is formed by multiple plate segments surrounding the sidewall of the protrusion 320. The overall shape of the protrusion 320 can be a rectangular cylindrical structure with a certain wall thickness. Of course, in practical applications, the shape of the protrusion 320 can be designed according to the shape of the heat dissipation fins 20. A groove-like structure is formed on the sidewall of the protrusion 320. This groove-like structure is a blind groove, forming a connecting groove 330. The connecting groove 330 has a certain depth in the direction along the heat dissipation fins 20 toward the evaporation chamber 10, which allows the heat dissipation fins 20 and the connecting part 30 to form a surface contact. Correspondingly, the open end of the heat dissipation fin 20 is inserted into the connecting groove 330 to complete the assembly of the heat dissipation fin 20 and enable the first cavity 210 to communicate with the evaporation cavity 10. The slot connection structure facilitates the docking assembly of the heat dissipation fin 20. Similarly, the protruding structure of the connecting groove 330 allows the two side walls of the open area in the heat dissipation fin 20 to be embedded in the connecting groove 330 and connected with the two opposing inner walls of the connecting groove 330, thereby improving the connection strength between the open end of the heat dissipation fin 20 and the protrusion 320, and also improving the sealing effect of the heat dissipation device.

[0060] The small contact area between the heat dissipation fins 20 and the evaporation chamber 10 can lead to insufficient welding strength. In this application, the heat dissipation fins 20 are inserted into the connecting part 30, or the connecting part 30 is inserted into the heat dissipation fins 20, so that the surface connection between the two can be achieved. When the connecting part is connected to the heat dissipation fins, the welding area on the heat dissipation fins can be increased, thereby improving the welding strength of the heat dissipation fins; thus improving the connection reliability between the heat dissipation fins and the evaporation chamber.

[0061] It should be noted that, as shown in Figure 6a, the protrusion 320 can be formed by a four-sided enclosed plate with an opening only on the side facing the heat dissipation fins 20. When the first cavity 210 of the heat dissipation fins 20 communicates with the protrusion 320, the first cavity 210 has four walls that contact the protrusion 320 and are connected by plugging. At the same time, as shown in Figure 6b, the protrusion 320 can also be formed by only two plate structures. In this case, the heat dissipation fins 20 can be connected to the protrusion 320 by plugging or sliding. After the protrusion 320 is connected to the heat dissipation fins 20, the two walls of the heat dissipation fins 20 are exposed on both sides of the protrusion 320, which can also achieve communication between the protrusion 320 and the first cavity 210. This simplifies the structure of the protrusion 320, resulting in lower processing difficulty and lower production cost.

[0062] In the heat dissipation device provided in the specific embodiments of this application, as shown in FIG7, the evaporation chamber 10 further includes a cover plate 120. The cover plate 120 is a plate structure with openings. Specifically, the cover plate 120 is assembled and connected to the interface 110 on the evaporation chamber 10 to cover the opening area of ​​the interface 110. At the same time, the cover plate 120 is also provided with a connecting hole 1210 corresponding to the heat dissipation fins 20. Here, "corresponding" specifically means that a first cavity 210 of one heat dissipation fin 20 can be sealed and connected to a single connecting hole 1210, or a first cavity 210 of multiple heat dissipation fins 20 can be sealed and connected. In one specific embodiment of this application, the connecting holes 1210 can be correspondingly arranged one-to-one with the heat dissipation fins 20. Based on this, the connecting portion 30 is stacked with the cover plate 120. Simultaneously, in the heat dissipation fins 20, the opening ends of the first cavities 210 are correspondingly connected to the connecting holes 1210. It should be noted that the opening area of ​​a single connecting hole 1210 is preferably larger than the opening area of ​​a single first cavity 210. Specifically, the corresponding connection between the opening ends of the first cavities 210 and the connecting holes 1210 means that after the heat dissipation fins 20 are assembled, the projected areas of the opening ends of a single first cavity 210 and its corresponding connecting holes 1210 on the cover plate 120 overlap. Furthermore, the connecting portion 30 and the cover plate 120 are surface-connected, improving the connection strength between them.

[0063] It should be emphasized that, as shown in Figure 7b, the cover plate 120 can also be used as the upper cover of the evaporation chamber 10, or it can be an integral structure with the evaporation chamber 10.

[0064] The cover plate 120 not only adapts to the structure of the interface 110 for installation, but also provides a larger corresponding communication area for the opening end of the first cavity 210 after the heat dissipation fins 20 and the connecting part 30 are installed, thus allowing for a certain range of installation error and reducing the assembly difficulty of the heat dissipation fins 20 and the evaporation cavity 10. Furthermore, to optimize the above technical solution, the connecting part 30 is designed as an integral structure to reduce installation difficulty.

[0065] To improve the heat transfer uniformity during the phase change heat dissipation process, in some specific embodiments of this application, a manifold 40 is also provided. The manifold 40 has a similar structure to the evaporation chamber 10. Specifically, a second cavity 410 is provided inside the manifold 40. The second cavity 410 also has an opening and is oriented towards the interface 110 of the evaporation chamber 10. It should be noted that, preferably, the storage volume of the second cavity 410 is larger than that of a single first cavity 210. Correspondingly, the first cavity 210 of the heat dissipation fins 20 has a structure with openings at both ends. The two ends of a single first cavity 210 are respectively connected to the second cavity 410 and the evaporation chamber 10, so that the first cavity 210, the second cavity 410, and the evaporation chamber 10 can form a closed cavity structure. Taking a specific embodiment of this application as an example, a phase change working fluid is added to the sealed cavity. The phase change working fluid vaporizes in the evaporation cavity 10 and sequentially passes through the connecting part 30 and the first cavity 210 of the heat dissipation fins 20 to reach the second cavity 410 of the confluence cavity 40. During the flow of the gaseous working fluid, it exchanges heat with the heat dissipation fins 20 and the confluence cavity 40 and liquefies. The liquefied phase change working fluid flows back to the evaporation cavity 10. Under some operating conditions, the first cavity 210 of the heat dissipation fins 20 may be blocked by gas or liquid, and a smooth return channel cannot be formed. At this time, the liquefied phase change working fluid can flow to the second cavity 410, and then flow back to the evaporation cavity 10 through other heat dissipation fins 20 connected to the second cavity 410. In addition, the second cavity 410 can also balance the gas pressure in each of the first cavities 210, thereby improving the heat dissipation efficiency of the heat dissipation fins 20. The inclusion of the manifold 40 increases the volume of the sealed cavity, allowing for the addition of a larger amount of phase change working fluid to the heat dissipation device. Simultaneously, its uniform effect on the gaseous phase change working fluid enables the heat dissipation fins 20 to complement each other during operation, thereby improving the uniformity of the heat exchange process, increasing heat dissipation efficiency, and extending the heat dissipation limit of the heat dissipation device. Furthermore, to enhance the uniformity of heat exchange during the heat dissipation process, this embodiment also includes turbulence columns 50. Specifically, several turbulence columns 50 are spaced apart within each first cavity 210. These turbulence columns 50 can be arranged in a uniform array or irregularly. The turbulence columns 50 are fixedly connected to at least one inner wall of the first cavity 210 to enhance the structural strength of the heat dissipation fins 20 and extend to provide a larger heat exchange area within the first cavity 210. Moreover, during the movement of the gaseous phase change working fluid within the first cavity 210, the presence of the turbulence columns 50 prolongs its residence time within the first cavity 210, resulting in heat exchange. Furthermore, based on the above structure, a turbulence column 50 structure can also be provided in the evaporation chamber 10 to increase the heat exchange area in the evaporation chamber 10 and to block and divert the phase change working fluid in different states.

[0066] In a specific embodiment where multiple heat dissipation fins 20 are provided, the outer walls of adjacent heat dissipation fins 20 are connected by corrugated teeth 220. Heat is transferred between the corrugated teeth 220 and the heat dissipation fins 20 on both sides through thermal conduction, and the large specific surface area of ​​the corrugated teeth 220 facilitates rapid heat dissipation. The corrugated teeth 220 can be flat or corrugated. Simultaneously, a capillary layer 60 can be provided on the inner wall of the first cavity 210. The capillary layer 60 significantly increases the surface area of ​​the first cavity 210 in contact with the phase change medium, allowing the area where the capillary layer 60 is provided to quickly exchange heat with the phase change working medium, thereby improving heat exchange efficiency.

[0067] In practical applications, one or more of the three elements—corrugated teeth 220, capillary layer 60, and turbulence column 50—can be applied to some specific embodiments of this application. The more types and numbers of specific applications, the better the heat dissipation effect.

[0068] In some specific embodiments of this application, the evaporation chamber 10 has connection interfaces 110 on its opposite sides. Correspondingly, heat dissipation fins 20 are arranged opposite each other on both sides of the evaporation chamber 10. At the same time, each connection interface 110 is sealed and connected to the first cavity 210 in the heat dissipation fin 20 through a connecting part 30. The above structure allows the heat dissipation fins 20 on one side of the evaporation chamber 10 to be close to the heat-generating area, so that heat can be absorbed through the heat dissipation fins 20 on that side. At the same time, by means of the change in the state of the working fluid, the heat dissipation fins 20 away from the heat-generating area can dissipate heat, realizing the circulation of the working fluid. The heat absorption and heat dissipation of the heat dissipation device are both achieved through the fin structure, which has a large contact area and can improve the heat absorption and heat dissipation efficiency of the heat dissipation device.

[0069] As shown in Figures 16-18, a specific embodiment of this application also provides a power conversion device. In some specific embodiments of this application, the power conversion device includes a housing 70 for enclosing the interior, and the interior of the housing 70 is divided into two contacting cavity structures, a third cavity 720 and a fourth cavity 730, by a first wall 710. The third cavity 720 houses multiple power devices 770 that primarily generate heat during operation, while the fourth cavity 730 houses the heat dissipation device provided in any of the above embodiments. Specifically, the evaporation chamber 10 of the heat dissipation device is disposed close to the first wall 710, and the power devices 770 are also disposed close to the first wall 710, so that most of the heat generated by the power devices 770 can be directly absorbed by the evaporation chamber 10, ensuring the heat dissipation effect of the heat dissipation device.

[0070] In the above specific embodiment, as shown in FIG16, the first wall 710 can be divided in the vertical direction to divide the housing 70 into a third cavity 720 and a fourth cavity 730 arranged along the first direction, where the first direction is the horizontal direction, and the arrangement means that the third cavity 720 and the fourth cavity 730 are arranged sequentially in the horizontal direction; so that the power conversion device has a specific regular structural placement effect.

[0071] Based on the above specific embodiments, the fourth cavity 730 is further provided with several air supply devices 780. These air supply devices 780 can be fans or blowers to drive airflow rapidly through the heat dissipation fins 20 structure in the heat dissipation device, quickly removing heat from the heat dissipation fins 20. Simultaneously, air vents are respectively opened on opposite sides of the fourth cavity 730 to allow external airflow to flow into and out of the fourth cavity 730 under the action of the air supply devices 780. Preferably, the air supply direction of the air supply devices 780 is parallel to the heat dissipation fins 20, so that the airflow is not obstructed and is accelerated, improving heat dissipation efficiency. Furthermore, the air supply range of the air supply devices 780 covers the entire area where the heat dissipation fins 20 are installed, so as to dissipate heat from the outer wall of each heat dissipation fin 20 by blowing air.

[0072] In addition, it should be noted that the power conversion device also includes a magnetic device 790, which is disposed in the fourth cavity 730. At the same time, the magnetic device 790 is located within the air supply range of the air supply device 780, so as to share the air supply of the air supply device 780 with the heat dissipation fins 20 to achieve heat dissipation.

[0073] It should also be noted that, as shown in Figure 18, in some other specific embodiments of this application, the power conversion device includes a housing 70 for enclosing the interior, and the interior of the housing 70 is divided into two contacting cavity structures, a fifth cavity 750 and a sixth cavity 760, by a second wall 740, as shown in Figure 17. The second wall 740 is arranged in a horizontal direction, so that the fifth cavity 750 and the sixth cavity 760 are arranged in a second direction, i.e., a vertical direction. It should also be noted that the sixth cavity 760 is located on top of the fifth cavity 750, so that the phase change working fluid after exothermic liquefaction in the heat dissipation fins 20 can flow back to the evaporation chamber 10 under the action of gravity.

[0074] Meanwhile, in the above specific embodiments, the fifth cavity 750 is provided with a plurality of power devices 770 that mainly generate heat during operation, while the sixth cavity 760 is provided with a heat dissipation device with heat dissipation fins 20 on both sides, as provided in the aforementioned specific embodiments. Specifically, the heat dissipation fins 20 on one side of the evaporation chamber 10 of the heat dissipation device are disposed close to the second wall surface 740, and the power devices 770 can be disposed close to or attached to the second wall surface 740, so that most of the heat generated by the power devices 770 can be directly absorbed by the heat dissipation fins 20 close to the second wall surface 740, thereby ensuring the heat dissipation effect of the heat dissipation device. The terms "first," "second," "third," "fourth," "fifth," "left side," and "right side," etc., in the specification, claims, and the above-mentioned drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may include steps or units not listed, but may include steps or units not listed.

[0075] The above description of the specific embodiments disclosed enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the specific embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat dissipation device, comprising an evaporation chamber (10), heat dissipation fins (20), and a connecting part (30), wherein the evaporation chamber (10) is a cavity structure with a connecting interface (110), the heat dissipation fins (20) are spaced apart and a first cavity (210) is provided inside the heat dissipation fins (20), the connecting part (30) is provided with a working fluid flow channel (340), the connecting interface (110) is connected to the first cavity (210) through the working fluid flow channel (340), and a portion of the evaporation chamber (10) and the first cavity (210) are filled with a phase change working fluid.

2. The heat dissipation device as described in claim 1, wherein, The connecting part (30) includes a plate (310) and a plurality of protrusions (320) disposed on the plate (310). The protrusions (320) extend in a direction away from the evaporation chamber (10). The working fluid flow channel (340) passes through the plate (310) and the protrusions (320). One end of the opening of the first cavity (210) of the heat dissipation fin (20) is connected to the protrusions (320).

3. The heat dissipation device as described in claim 2, wherein, The evaporation chamber (10) is also provided with a cover plate (120) at the interface (110). The cover plate (120) covers the interface (110) and is provided with a plurality of connecting holes (1210). The connecting part (30) is stacked with the cover plate (120). The first cavity (210) is connected to the evaporation chamber (10) through the working fluid flow channel (340) and the connecting holes (1210).

4. The heat dissipation device as described in claim 2 or 3, wherein, A connecting groove (330) is provided in the side wall surrounding the protrusion (320). The opening of the connecting groove (330) is located away from the evaporation cavity (10). The side wall of the first cavity (210) opening of the heat dissipation fin (20) is inserted into the connecting groove (330). Alternatively, one end of the opening of the first cavity (210) of the heat dissipation fins (20) is inserted into the working fluid flow channel (340); Alternatively, the end of the protrusion (320) facing away from the evaporation cavity (10) can be inserted into the opening of the first cavity (210) of the heat dissipation fins (20).

5. The heat dissipation device as described in claim 2, wherein, The protrusion (320) is an annular protrusion structure formed by four plates. Alternatively, the protrusion (320) may be a groove-shaped protrusion structure formed by two plates spaced apart.

6. The heat dissipation device according to any one of claims 1-3, wherein, The heat dissipation fins (20) are connected to the connecting portion (30).

7. The heat dissipation device as claimed in claim 1, wherein, It also includes a manifold (40), in which a second cavity (410) is provided, and the second cavity (410) is connected to the interface (110) through the first cavity (210) and the connecting part (30) on the manifold (40).

8. The heat dissipation device as claimed in claim 1, wherein, The first cavity (210) is provided with a plurality of turbulence-disrupting columns (50) spaced apart, and the turbulence-disrupting columns (50) are fixedly connected to at least one inner wall of the first cavity (210). And / or, the inner wall of the first cavity (210) is provided with a capillary layer (60); And / or, the outer walls of adjacent heat dissipation fins (20) are connected by corrugated teeth (220).

9. The heat dissipation device as claimed in claim 1, wherein, The evaporation cavity (10) has the interface (110) respectively opened on opposite sides. The heat dissipation fins (20) are arranged opposite to each other on both sides of the evaporation cavity (10), and each interface (110) is sealed and connected to the first cavity (210) of the heat dissipation fin (20) through a connecting part (30).

10. A power conversion device, comprising a housing (70), wherein the housing (70) is divided into a third cavity (720) and a fourth cavity (730) by a first wall (710), wherein a plurality of power devices (770) are disposed in the third cavity (720), and the power devices (770) are disposed on the evaporation cavity (10) of the heat dissipation device as described in any one of claims 1-9.

11. The power conversion device as claimed in claim 10, wherein, Some or all of the heat dissipation fins (20) are located within the fourth cavity (730); the third cavity (720) and the fourth cavity (730) are arranged along a first direction, or the third cavity (720) and the fourth cavity (730) are arranged along a second direction; The fourth cavity (730) is provided with an air vent and several air supply devices (780).

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