Power conversion device and heat dissipation assembly

Abstract

The application discloses a power conversion device and a heat dissipation assembly, and belongs to the electronic technical field. The power conversion device comprises a heating element, an evaporator with an evaporation cavity, a condenser with a condensation cavity, and a liquid return assembly. The condensation cavity is communicated with the evaporation cavity, and the condensation cavity has a flow convergence part. The liquid return assembly comprises a working medium pump, a liquid collecting part with a liquid collecting cavity, and a liquid return pipe with a first end and a second end. The first end is connected with the liquid collecting part, the second end is arranged in the evaporation cavity and is higher than the heating element, and the second end is arranged on a heat-conducting inner wall surface of the evaporator away from the heating element. In the case that the working medium pump normally works, the working medium pump delivers the liquid working medium in the flow convergence part to the evaporation cavity for heat exchange. In the case that the working medium pump stops working, the liquid working medium flowing out of the liquid return pipe flows and spreads on the heat-conducting inner wall surface, exchanges heat with the heating element, so that dry burning is avoided, and the stability of the heat dissipation system is maintained.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a power conversion device and a heat dissipation component. Background Technology

[0002] In existing power conversion equipment, power devices use thermosiphon radiators for heat dissipation. The heat generated by the power devices during operation is transferred to the cooling medium in the evaporator. The cooling medium absorbs heat, boils, and forms a gaseous state. The gaseous cooling medium is transferred to the condenser, where it releases heat and condenses. The liquid cooling medium in the condenser then flows back to the evaporator. This two-phase circulation of the cooling medium dissipates heat from the power devices.

[0003] To improve the heat exchange efficiency of thermosiphon radiators, related technologies add a drive pump to the existing radiator structure to transport the liquid working fluid in the condenser to the evaporator. However, the stability of the heat dissipation system is difficult to maintain during long-term operation of pump-driven radiators. Utility Model Content

[0004] This application provides a power conversion device to solve the technical problem that the stability of the heat dissipation system is difficult to maintain during long-term operation of pump-driven radiators; another objective of this application is to provide a heat dissipation component.

[0005] To achieve the above objectives, according to a first aspect of this application, a power conversion device is provided, comprising:

[0006] Heating element;

[0007] An evaporator, thermally connected to the heating element, and having an evaporation chamber;

[0008] A condenser has a condensation chamber connected to an evaporation chamber, so that the gaseous working fluid in the evaporation chamber can enter the condensation chamber for condensation, and the condensation chamber has a confluence section;

[0009] The liquid return assembly includes a working fluid pump, which drives the liquid working fluid in the manifold to flow to the evaporation chamber;

[0010] The liquid collecting section has a liquid collecting cavity, and the liquid collecting cavity is connected to the condensation cavity;

[0011] The return pipe includes a first end and a second end. The first end is connected to the liquid collection part, and the second end is disposed in the evaporation chamber and is higher than the heating element in a first direction. The second end is disposed towards the heat-conducting inner wall surface of the evaporator away from the heating element, so that the liquid working fluid in the liquid collection chamber can flow to the heat-conducting inner wall surface and cover the orthogonal projection area of ​​the heating element on the heat-conducting inner wall surface along a second direction, the second direction intersecting the first direction.

[0012] Optionally, the condenser includes a first shell and a second shell, the first shell and the second shell are hollow structures and are interconnected, the internal spaces of the first shell and the second shell together form the condensation chamber, and the flow-collecting section is formed inside the second shell.

[0013] Optionally, the liquid collection section is disposed between the first housing and the second housing, and the liquid collection cavity is connected to the internal spaces of the first housing and the second housing respectively.

[0014] Optionally, the condenser further includes a plurality of condenser tubes, which are respectively disposed on both sides of the liquid collection section, and the liquid collection section is connected to the first housing and the second housing respectively through the condenser tubes.

[0015] Optionally, the liquid collection section is disposed in the first housing or the second housing.

[0016] Optionally, the first housing and the second housing are arranged at intervals along the first direction.

[0017] Optionally, the liquid return assembly further includes a delivery pipe, which is connected to the evaporator and the condenser respectively, and the working fluid pump is disposed on the delivery pipe.

[0018] Optionally, the liquid outlet end of the delivery pipe is higher than the heating element and is positioned close to the heat-conducting inner wall surface.

[0019] Optionally, the evaporator and the condenser are connected, and a mounting hole is provided at the connection point, with the working fluid pump disposed in the mounting hole.

[0020] Optionally, the return pipe is equipped with a control valve.

[0021] According to a second aspect of this application, a heat dissipation component is provided, comprising:

[0022] An evaporator for thermally connecting to a heating element, the evaporator having an evaporation chamber;

[0023] A condenser has a condensation chamber connected to an evaporation chamber, so that the gaseous working fluid in the evaporation chamber can enter the condensation chamber for condensation, and the condensation chamber has a confluence section;

[0024] The liquid return assembly includes a working fluid pump, which drives the liquid working fluid in the manifold to flow to the evaporation chamber;

[0025] The liquid collecting section has a liquid collecting cavity, and the liquid collecting cavity is connected to the condensation cavity;

[0026] The return pipe includes a first end and a second end. The first end is connected to the liquid collection part, and the second end is disposed in the evaporation chamber and is disposed opposite to the heat-conducting inner wall surface of the evaporator so that the liquid working fluid in the liquid collection chamber can flow to the heat-conducting inner wall surface. The second end is configured to be higher than the heating element.

[0027] In the power conversion device of this application embodiment, the liquid collecting chamber contains a portion of condensed liquid working fluid, which flows through the liquid collecting pipe to the heat-conducting inner wall surface. When the working fluid pump is operating normally, it delivers the liquid working fluid from the manifold to the evaporation chamber for heat exchange. During this process, the liquid working fluid flowing out from the return pipe also flows into the evaporation chamber; the combination of these two processes improves heat exchange efficiency. When the working fluid pump stops operating, the liquid working fluid flowing out from the return pipe spreads and spreads on the heat-conducting inner wall surface, exchanging heat with the heating element to prevent dry burning and maintain the stability of the heat dissipation system.

[0028] The liquid working fluid flowing out of the return pipe flows along the inner wall of the heat-conducting tube, increasing the coverage area of ​​the liquid working fluid. The return pipe is higher than the heating element, which ensures that the position where the heating element is in direct contact with the evaporator can exchange heat with the liquid working fluid, reducing the amount of working fluid required.

[0029] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0032] Figure 1 This is a schematic diagram of the power conversion device provided in the embodiments of this application;

[0033] Figure 2This is a schematic diagram showing the location of the working fluid pump provided in an embodiment of this application;

[0034] Figure 3 A schematic diagram of the structure of the first housing, the second housing, and the evaporator provided in the embodiments of this application;

[0035] Figure 4 A schematic diagram showing the distribution of the first housing, the liquid collection section, and the second housing provided for embodiments of this application;

[0036] Figure 5 Another structural schematic diagram of the first housing, the second housing, and the evaporator provided in the embodiments of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Heating element; 2. Evaporator; 20. Evaporation chamber; 21. Heat-conducting inner wall surface; 22. Mounting hole; 23. Connecting hole; 3. Condenser; 30. Condensation chamber; 301. Manifold; 31. First housing; 32. Second housing; 4. Liquid return assembly; 41. Working fluid pump; 42. Delivery pipe; 421. Liquid outlet; 5. Liquid collection section; 50. Liquid collection chamber; 6. Liquid return pipe; 61. First end; 62. Second end; 63. Control valve; 7. Condensing tube; 71. Heat sink; 8. Gas pipe; X, First direction; Y, Second direction. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0040] In the description of this application, it should be understood that the terms "height," "thickness," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, and "at least one" can mean one, two, or more, unless otherwise expressly specified.

[0041] It should also be noted that in the accompanying drawings of the embodiments of this application, the arrow marked with X represents the first direction X, and the arrow marked with Y represents the second direction Y. The introduction of the first direction X and the second direction Y is to more clearly illustrate the structure and relative positional relationship of each component in the power conversion device. In practical applications, the first direction X and the second direction Y may change depending on the placement of the power conversion device.

[0042] As a prelude to the embodiments of this application, existing thermosiphon radiators mainly rely on gravity to achieve the gas-liquid two-phase conversion of the cooling medium. Furthermore, the liquid level of the cooling medium in the evaporator cannot be lower than the heating element to prevent localized overheating of the heating element. Therefore, this type of radiator requires a relatively large amount of cooling medium. In contrast, pump-driven thermosiphon radiators use a pump to deliver the liquid medium from the condenser to the evaporator for heat exchange. Due to the driving force of the pump, a small amount of cooling medium can be injected into the radiator to maintain the liquid level in the evaporator above the heating element. During long-term operation, the pump is prone to jamming, stalling, cavitation damage, and wear failure due to continuous operation. When the pump stops, the entire circulation loop of the cooling medium is cut off, causing the entire heat dissipation system to malfunction.

[0043] This application provides a power conversion device; please refer to [link / reference]. Figure 1 and Figure 2 The power conversion device includes a heating element 1, an evaporator 2, a condenser 3, a liquid return assembly 4, a liquid collection section 5, and a liquid return pipe 6. The heating element 1 can be a power module, chip, circuit board, or other device. It generates a lot of heat during the operation of the device, so it needs to be cooled to maintain the stable operation of the device.

[0044] Evaporator 2 has an evaporation chamber 20. Evaporator 2 is thermally connected to heating element 1. This thermal connection can be achieved by the heating element 1 being in contact with the outer wall of evaporator 2, or by a thermally conductive medium, such as thermal grease, thermal pads, or thermal adhesive, existing between the heating element 1 and the outer wall of evaporator 2. Condenser 3 has a condensation chamber 30. Condensation chamber 30 and evaporation chamber 20 are used to contain the working fluid for gas-liquid two-phase conversion. Condensation chamber 30 and evaporation chamber 20 are interconnected, allowing the gaseous working fluid in evaporation chamber 20 to enter condensation chamber 30 for condensation. Condensation chamber 30 has a confluence section 301, which is a region where liquid working fluid accumulates under gravity within condensation chamber 30. The evaporator 2 has a heat-conducting outer wall surface and a heat-conducting inner wall surface 21 arranged relative to its wall thickness. The heat-conducting outer wall surface is used for thermal connection with the heating element 1, and the heat-conducting inner wall surface 21 is in contact with the liquid working fluid. The heat from the heating element 1 is transferred from the heat-conducting outer wall surface to the heat-conducting inner wall surface 21. The liquid working fluid absorbs the heat and evaporates, thereby dissipating heat from the heating element 1. The gaseous working fluid enters the condensation chamber 30 and exchanges heat with the external environment. The condensed droplets fall to the confluence section 301 under the action of gravity.

[0045] The liquid return assembly 4 includes a working fluid pump 41, which drives the liquid working fluid in the manifold 301 to flow to the evaporation chamber 20 to form a pump-driven circulation of the liquid working fluid. The working fluid pump 41 can be located outside the evaporator 2 and the condenser 3, or it can be located inside at least one of the evaporator 2 and the condenser 3.

[0046] The liquid collecting section 5 has a liquid collecting chamber 50, which is connected to the condensing chamber 30. That is, some of the gaseous working fluid in the condensing chamber 30 can also enter the liquid collecting chamber 50 for condensation, or some of the working fluid condensed in the condensing chamber 30 can flow into the liquid collecting chamber 50. The return pipe 6 includes a first end 61 and a second end 62. The first end 61 is connected to the liquid collecting section 5, and at least a portion of the first end 61 is lower than the liquid level of the liquid working fluid in the liquid collecting chamber 50. The second end 62 is disposed in the evaporation chamber 20 and is higher than the heating element 1 in the first direction X. The second end 62 is disposed towards the heat-conducting inner wall surface 21 of the evaporator 2 away from the heating element 1, so that the liquid working fluid in the liquid collecting chamber 50 can flow onto the heat-conducting inner wall surface 21 and cover the orthogonal projection area of ​​the heating element 1 on the heat-conducting inner wall surface 21 along the second direction Y. The first direction X corresponds to the height direction of the evaporator 2, and the second direction Y corresponds to the width direction of the evaporator 2. The first direction X and the second direction Y intersect. In one implementation, the heating element 1 and the return pipe 6 have orthographic projections on the same projection plane along the first direction X, and the orthographic projection of the return pipe 6 at the corresponding second end 62 can overlap with the orthographic projection of the heating element 1 along the second direction Y. The second end 62 is close to the heat-conducting inner wall surface 21, and the opening of the second end 62 faces the heat-conducting inner wall surface 21. The liquid working fluid flowing out from the second end 62 falls on the heat-conducting inner wall surface 21, spreads on the heat-conducting inner wall surface 21, and flows downward under the action of gravity. The spread liquid working fluid can at least cover the orthographic projection area of ​​the heating element 1 along the second direction Y on the heat-conducting inner wall surface 21. In another implementation, the opening of the second end 62 is set as a flat opening, and the length of the flat opening is greater than the length of the heating element 1. By increasing the width of the liquid working fluid flowing out from the second end 62, it is ensured that the liquid working fluid flowing down along the heat-conducting inner wall surface 21 can cover the orthographic projection area of ​​the heating element 1 along the second direction Y on the heat-conducting inner wall surface 21.

[0047] When the working fluid pump 41 is working normally, it delivers the liquid working fluid in the manifold 301 to the evaporation chamber 20 for heat exchange. The liquid level in the evaporation chamber 20 is higher than that of the heating element 1. The liquid working fluid flowing out from the return pipe 6 merges into the liquid working fluid in the evaporation chamber 20. The combination of the two can improve the heat exchange efficiency. When the working fluid pump 41 stops working, for example, if the working fluid pump 41 fails due to long-term operation, the liquid working fluid flowing out from the return pipe 6 flows and spreads on the heat-conducting inner wall surface 21 and exchanges heat with the heating element 1 to prevent dry burning and maintain the stability of the heat dissipation system.

[0048] The liquid working fluid flowing out from the second end 62 flows along the heat-conducting inner wall surface 21, increasing the coverage area of ​​this liquid working fluid. The return pipe 6 is higher than the heating element 1, which ensures that the part of the heating element 1 that is in direct contact with the evaporator 2 can exchange heat with the liquid working fluid. This achieves basic heat dissipation of the heating element 1 under limited working fluid flow, which helps to improve the stability and reliability of the heat dissipation system.

[0049] Please see Figure 1 In some embodiments, the condenser 3 includes a first housing 31 and a second housing 32. The first housing 31 and the second housing 32 are hollow structures and are interconnected. The internal spaces of the first housing 31 and the second housing 32 together form a condensation chamber 30, and a manifold 301 is formed inside the second housing 32. The first housing 31 and the second housing 32 are hollow structures, meaning that both have internal cavities. The internal cavities of the first housing 31 and the second housing 32 are interconnected, and the two internal cavities together form the condensation chamber 30. The internal capacity of both the first housing 31 and the second housing 32 is greater than the capacity of the liquid collection chamber 50, so as to ensure that the condenser 3 has a larger heat dissipation surface area than the liquid collection chamber 5, thereby providing the manifold 301 with sufficient working fluid for the continuous delivery of the working fluid pump 41.

[0050] The first housing 31 and the second housing 32 can be spaced apart or connected together. They can be connected by a pipe to allow the two inner cavities to communicate with each other. Alternatively, if the first housing 31 and the second housing 32 are connected, a perforated structure at the connection point can be used to connect the two inner cavities. The first housing 31 and the second housing 32 can form different structural shapes, such as L-shapes or T-shapes, to expand the overall heat dissipation surface area through different combinations, or to avoid interference with surrounding structural components, or to adapt to the installation space, thus meeting different assembly requirements. Furthermore, the first housing 31 and the second housing 32 can be arranged with the liquid collection section 5 in different forms, such as a straight line arrangement or a triangular arrangement, to form different working fluid flow paths.

[0051] In addition, the gaseous working fluid in the evaporation chamber 20 flows from the first shell 31 to the second shell 32. The first shell 31 can be used to receive the gaseous working fluid from the evaporation chamber 20 and withstand the main pressure fluctuations. The second shell 32 can be mainly used to contain the liquid working fluid formed by condensation, realizing segmented condensation and functional division.

[0052] Please see Figure 1 In some embodiments, the liquid collecting part 5 is disposed between the first housing 31 and the second housing 32, and the liquid collecting cavity 50 communicates with the internal spaces of the first housing 31 and the second housing 32 respectively. In one implementation, the liquid collecting part 5 is connected to the first housing 31 and the second housing 32 respectively through external pipes, so that the liquid collecting cavity 50 communicates with the internal spaces of the first housing 31 and the second housing 32 through the pipes. In another implementation, the outer wall of the liquid collecting part 5 is connected to the outer walls of the first housing 31 and the second housing 32, and a hole structure is provided at the connection point to achieve mutual conduction.

[0053] The first housing 31, the liquid collecting section 5, and the second housing 32 are arranged sequentially, which facilitates assembly and saves space. The liquid collecting section 5 is located on the flow path of the gaseous working medium from the first housing 31 to the second housing 32, which ensures that the gaseous working medium flows into the liquid collecting chamber 50 for condensation, and that the droplets formed by condensation in the first housing 31 flow into the liquid collecting chamber 50 first, so that a certain amount of liquid working medium is maintained in the liquid collecting chamber 50.

[0054] Please see Figure 1 In some embodiments, the condenser 3 further includes multiple condenser tubes 7, which are respectively disposed on both sides of the liquid collection section 5, with the condenser tubes 7 on either side arranged at intervals. The liquid collection section 5 is connected to the first housing 31 and the second housing 32 respectively through the condenser tubes 7, so that the liquid collection chamber 50 is connected to the inner cavities of the first housing 31 and the second housing 32 respectively through the condenser tubes 7. In addition to connecting the liquid collection chamber 50 and the inner cavities, the condenser tubes 7 also increase the heat exchange area between the gaseous working fluid and the external environment, which is beneficial to improving the overall condensation efficiency.

[0055] Please see Figure 1 In some embodiments, a heat sink 71 is provided between two adjacent condenser tubes 7. The heat sink 71 is used to increase the contact area between the condenser tube 7 and the outside air, thereby improving the condensation efficiency of the condenser tube 7.

[0056] In some embodiments, the liquid collecting part 5 is disposed on one of the first housing 31 and the second housing 32. That is, the liquid collecting part 5 can be disposed on the first housing 31, or the liquid collecting part 5 can be disposed on the second housing 32, and the liquid collecting part 5 is higher than the confluence part 301. The liquid collecting part 5 can be directly connected to either the first housing 31 or the second housing 32 to achieve different combination structures and increase the flexibility of the structure.

[0057] Please see Figure 1 In some embodiments, the return pipe 6 is equipped with a control valve 63. The control valve 63 is used to connect or disconnect the return pipe 6, and can be selected according to the actual working conditions to keep the return pipe 6 in a normally open state or to connect the return pipe 6 when the working fluid pump 41 stops working, so as to meet different usage requirements.

[0058] In some embodiments, a drive pump is provided on the return pipe 6 to pump out the liquid working fluid in the collection chamber 50. The collection section 5 and the condenser 3 can have different relative positions, which will change the height of the collection section 5. The return pipe 6, in conjunction with the drive pump, can ensure that the liquid working fluid in the collection chamber 50 can be transported to the heat-conducting inner wall surface 21.

[0059] Please see Figure 1 In some embodiments, the first housing 31 and the second housing 32 are arranged at intervals along a first direction X. The first direction X may be parallel to the direction of gravity, so that after the gaseous working fluid condenses into droplets, it can fall naturally under gravity, which helps to increase the collection speed of the liquid working fluid in the second housing 32 and reduces the need for additional driving structures.

[0060] In conjunction with the aforementioned embodiment, the liquid collecting part 5 is disposed between the first housing 31 and the second housing 32, and the first housing 31 and the second housing 32 are respectively connected to the liquid collecting part 5 through the condenser pipe 7. The top of the condenser pipe 7 located below is higher than the inner bottom surface of the liquid collecting part 5, so that the liquid working fluid in the liquid collecting chamber 50 overflows into the condenser pipe 7 and then flows into the second housing 32, so that the liquid collecting chamber 50 can store a certain amount of liquid working fluid for delivery by the return liquid pipe 6.

[0061] Please see Figure 4 In some other embodiments, the first housing 31 and the second housing 32 may also be arranged at intervals along the second direction Y, or the arrangement direction of the first housing 31 and the second housing 32 may be set at an angle to the second direction Y, and the second housing 32 may be lower than the first housing 31.

[0062] Please see Figure 1 In some embodiments, the liquid return assembly 4 further includes a delivery pipe 42, which is connected to the evaporator 2 and the condenser 3 respectively, and the working fluid pump 41 is disposed on the delivery pipe 42. The delivery pipe 42 is an external pipe for the evaporator 2 and the condenser 3, with a simple structure and convenient assembly.

[0063] Please see Figure 2In some embodiments, the liquid outlet 421 of the delivery pipe 42 is higher than the heating element 1 and is positioned close to the heat-conducting inner wall surface 21, so that the liquid working fluid discharged from the liquid outlet 421 can contact the heat-conducting inner wall surface 21 and cover the orthogonal projection area of ​​the heating element 1 along the second direction Y on the heat-conducting inner wall surface 21. After contacting the heat-conducting inner wall surface 21, the liquid working fluid discharged from the liquid outlet 421 can diffuse downwards, thereby increasing the coverage area of ​​the liquid working fluid. On the one hand, this allows the heating element 1 to continuously exchange heat with the liquid working fluid, and on the other hand, it can further reduce the total amount of working fluid required, thereby reducing the load on the working fluid pump 41 and the need for precise flow control.

[0064] Please see Figure 1 and Figure 2 In some embodiments, when the working fluid pump 41 is connected to the evaporator 2 and the condenser 3 through the delivery pipe 42, the working fluid pump 41 can be located above the evaporator 2 and the condenser 3 along the first direction X, or it can be located below the evaporator 2 and the condenser 3 along the first direction X. The specific location can be selected according to factors such as actual working conditions, pipeline layout and installation space.

[0065] Please see Figure 3 In some embodiments, the evaporator 2 and the condenser 3 are connected, and a mounting hole 22 is provided at the connection point. The working fluid pump 41 is disposed in the mounting hole 22. Specifically, the second housing 32 is connected to the evaporator 2, and a mounting hole 22 is provided at the connection point. The working fluid pump 41 is integrated into the evaporator 2 and the condenser 3, which not only reduces the space required by the pump itself, but also reduces the space occupied by the pump, thus facilitating the miniaturization design of the equipment.

[0066] Please see Figure 1 , Figure 3 and Figure 5In some embodiments, at least one of the first housing 31 and the second housing 32 is connected to or spaced apart from the evaporator 2. Specifically, the first housing 31 and the second housing 32 may be spaced apart from the evaporator 2 in the second direction Y; or, the first housing 31 and the second housing 32 may be connected to the evaporator 2; or, the first housing 31 is connected to the evaporator 2, and the second housing 32 is spaced apart from the evaporator 2 in the second direction Y; or, the first housing 31 is spaced apart from the evaporator 2 in the second direction Y, and the second housing 32 is connected to the evaporator 2. When the first housing 31 is connected to the evaporator 2, a connecting hole 23 is formed at the connection point, through which the evaporation chamber 20 communicates with the condensation chamber 30. When the first housing 31 is spaced apart from the evaporator 2, the first housing 31 is connected to the evaporator 2 via a gas pipe 8, so that the evaporation chamber 20 communicates with the condensation chamber 30 via the gas pipe 8. When the second housing 32 is connected to the evaporator 2, the working fluid pump 41 can be installed at the connection point, or it can be connected to the second housing 32 and the evaporator 2 separately via the delivery pipe 42. When the second housing 32 and the evaporator 2 are spaced apart, the working fluid pump 41 is connected to the second housing 32 and the evaporator 2 separately via the delivery pipe 42.

[0067] According to a second aspect of this disclosure, a heat dissipation assembly is provided, including an evaporator 2, a condenser 3, a liquid return assembly 4, a liquid collection section 5, and a liquid return pipe 6. The evaporator 2 is thermally connected to a heating element 1 and has an evaporation chamber 20. The condenser 3 has a condensation chamber 30, which is interconnected with the evaporation chamber 20 to allow gaseous working fluid in the evaporation chamber 20 to enter the condensation chamber 30 for condensation. The condensation chamber 30 has a manifold 301. The liquid return assembly 4 includes a working fluid pump 41, which drives the liquid working fluid in the manifold 301 to flow towards the evaporation chamber 20. The liquid collection section 5 has a liquid collection chamber 50, which is connected to the condensation chamber 30. The return pipe 6 includes a first end 61 and a second end 62. The first end 61 is connected to the liquid collection part 5, and the second end 62 is disposed in the evaporation chamber 20 and is disposed opposite to the heat-conducting inner wall surface 21 of the evaporator 2, so that the liquid working fluid in the liquid collection chamber 50 can flow to the heat-conducting inner wall surface 21. The second end 62 is configured to be higher than the heating element 1.

[0068] The heat dissipation component has all the aforementioned beneficial effects, which will not be elaborated further in this disclosure.

[0069] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0070] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0071] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A power conversion device, characterized in that, include: Heating element (1); An evaporator (2) is thermally connected to the heating element (1) and has an evaporation chamber (20); The condenser (3) has a condensation chamber (30) connected to the evaporation chamber (20) so that the gaseous working fluid in the evaporation chamber (20) can enter the condensation chamber (30) for condensation. The condensation chamber (30) has a confluence section (301). The liquid return assembly (4) includes a working fluid pump (41) for driving the liquid working fluid in the manifold (301) to flow to the evaporation chamber (20); The liquid collection section (5) has a liquid collection chamber (50), and the liquid collection chamber (50) is connected to the condensation chamber (30); The return pipe (6) includes a first end (61) and a second end (62). The first end (61) is connected to the liquid collection part (5). The second end (62) is disposed in the evaporation chamber (20) and is higher than the heating element (1) in the first direction (X). The second end (62) is disposed facing the evaporator (2) away from the heat-conducting inner wall surface (21) of the heating element (1) so that the liquid working fluid in the liquid collection chamber (50) can flow to the heat-conducting inner wall surface (21) and cover the orthogonal projection area of ​​the heating element (1) on the heat-conducting inner wall surface (21) along the second direction (Y). The second direction (Y) intersects with the first direction (X).

2. The power conversion device according to claim 1, characterized in that, The condenser (3) includes a first shell (31) and a second shell (32). The first shell (31) and the second shell (32) are hollow structures and are interconnected. The internal spaces of the first shell (31) and the second shell (32) together form the condensation chamber (30). The confluence section (301) is formed inside the second shell (32).

3. The power conversion device according to claim 2, characterized in that, The liquid collection part (5) is disposed between the first housing (31) and the second housing (32), and the liquid collection cavity (50) is connected to the internal space of the first housing (31) and the second housing (32).

4. The power conversion device according to claim 3, characterized in that, The condenser (3) also includes a plurality of condenser tubes (7), which are respectively disposed on both sides of the liquid collection part (5). The liquid collection part (5) is connected to the first housing (31) and the second housing (32) respectively through the condenser tubes (7).

5. The power conversion device according to claim 2, characterized in that, The liquid collection part (5) is disposed in the first housing (31) or the second housing (32).

6. The power conversion device according to claim 2, characterized in that, The first housing (31) and the second housing (32) are arranged at intervals along the first direction (X).

7. The power conversion device according to claim 1, characterized in that, The liquid return assembly (4) also includes a delivery pipe (42), which is connected to the evaporator (2) and the condenser (3) respectively, and the working fluid pump (41) is disposed on the delivery pipe (42).

8. The power conversion device according to claim 7, characterized in that, The liquid outlet (421) of the delivery pipe (42) is higher than the heating element (1) and is positioned close to the heat-conducting inner wall surface (21).

9. The power conversion device according to claim 1, characterized in that, The evaporator (2) and the condenser (3) are connected and a mounting hole (22) is provided at the connection. The working fluid pump (41) is provided in the mounting hole (22).

10. The power conversion device according to claim 1, characterized in that, The return pipe (6) is equipped with a control valve (63).

11. A heat dissipation component, characterized in that, include: An evaporator (2) is used for thermally connecting with a heating element (1), the evaporator (2) having an evaporation chamber (20); The condenser (3) has a condensation chamber (30) connected to the evaporation chamber (20) so that the gaseous working fluid in the evaporation chamber (20) can enter the condensation chamber (30) for condensation. The condensation chamber (30) has a confluence section (301). The liquid return assembly (4) includes a working fluid pump (41) for driving the liquid working fluid in the manifold (301) to flow to the evaporation chamber (20); The liquid collection section (5) has a liquid collection chamber (50), and the liquid collection chamber (50) is connected to the condensation chamber (30); The return pipe (6) includes a first end (61) and a second end (62). The first end (61) is connected to the liquid collection part (5). The second end (62) is disposed in the evaporation chamber (20) and is disposed opposite to the heat-conducting inner wall surface (21) of the evaporator (2) so that the liquid working fluid in the liquid collection chamber (50) can flow to the heat-conducting inner wall surface (21). The second end (62) is configured to be higher than the heating element (1).

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