Power converter

Abstract

Provided in the present application is a power converter. The power converter comprises a chassis. The chassis is divided into a first chamber and a second chamber by a partition plate. A heat-generating device is provided in the first chamber. The second chamber is provided with an air inlet on a front face, and two air outlets on side faces, the two air outlets being located on different sides. A fan and a heat sink are provided inside the second chamber. An air intake side of the fan faces the air inlet. The heat sink comprises an evaporation cavity and a condenser. The partition plate is provided with an opening, the evaporation cavity covers the opening and is connected to the partition plate, and a cooling medium is provided inside the evaporation cavity. The condenser is located on the side of the evaporation cavity facing the air inlet and is in communication with the evaporation cavity. The condenser is located between the air inlet and either of the air outlets. During heat dissipation, the power converter intakes air from the front face and outputs air from two different side faces, so as to discharge heat from two different air passages, thereby shortening the length of a heat dissipation path, reducing the accumulation of heat in the air passages, and further improving the heat dissipation capability of the power converter.

Description

A power converter

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202422367448.9, filed on September 26, 2024, and entitled “A power converter”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of electronic technology, and in particular to a power converter. BACKGROUND

[0004] In the transmission and use of electric energy, the voltage or current parameters of electric energy need to be converted or regulated. For example, in a photovoltaic power generation system, direct current generated by a solar panel needs to be converted into alternating current and then output externally, which can be achieved by an inverter. In the inverter, a chip, an inductive component and other electronic components generate a large amount of heat during operation, which needs to be dissipated to the external environment in time through a heat dissipation device to avoid failure of the electronic components due to overheating.

[0005] With the increasing power of the inverter, the heat generated by the power components in the inverter also increases, and the heat dissipation capacity of the inverter is required to be higher. At present, a fan is arranged inside the inverter. An air outlet is formed at the top of the inverter, and an air inlet is formed at the bottom of the inverter. When the inverter is dissipating heat, gas enters the inverter from the air inlet at the bottom and flows out from the air outlet at the top. Inside the inverter, the gas flows through the heat generating components from bottom to top. However, since the gas has exchanged heat with the heat generating components at the bottom and has been heated, when the gas passes through the heat generating components at the top, the heat exchange effect between the heat generating components at the top and the gas is much smaller than that between the heat generating components at the bottom and the gas, thereby causing a heat cascade phenomenon. Moreover, the entire heat dissipation path inside the inverter is long, which causes large air resistance and reduces the flow rate of the gas inside the inverter, which greatly affects the heat dissipation effect of the inverter. Therefore, how to improve the heat dissipation effect of the power components of the inverter has become a technical problem to be solved at present. SUMMARY

[0006] The present application provides a power converter to shorten the heat dissipation path inside the power converter, thereby improving the heat dissipation efficiency of the power converter.

[0007] In a first aspect, the present application provides a power converter. The power converter comprises a cabinet. An inner space of the cabinet is provided with a partition plate, which separates the inner space of the cabinet into a first chamber and a second chamber. Specifically, at least one heat generating device is arranged in the first chamber. The second chamber comprises a top plate arranged opposite to the partition plate, and a plurality of side plates connected in sequence. The side plates are located between the partition plate and the top plate, and the side plates, the partition plate and the top plate enclose the second chamber. In the second chamber, the top plate is provided with an air inlet, the plurality of side plates comprise a first side plate and a second side plate, the first side plate is provided with a first air outlet, and the second side plate is provided with a second air outlet. The second chamber is provided with a first fan and at least one heat sink. The first fan is arranged at the air inlet. The partition plate is provided with an opening corresponding to the at least one heat sink. Each of the at least one heat sink comprises an evaporation chamber and a condenser. The evaporation chamber covers the corresponding opening and is fixedly connected to the partition plate, and the at least one heat generating device is attached to the evaporation chamber. The evaporation chamber is provided with a cooling working medium. The condenser is fixedly connected to a side surface of the evaporation chamber facing the top plate, and the condenser is in communication with the evaporation chamber to enable the cooling working medium to flow between the evaporation chamber and the condenser. The condenser is located between the air inlet and the first air outlet or between the air inlet and the second air outlet.

[0008] In the power converter of the present application, the inner space of the cabinet is divided into two chambers. The first chamber is used to accommodate various components of the power converter, and the second chamber is used as a heat dissipation chamber of the power converter. By means of the opening of the partition plate, the heat generating device in the first chamber can be attached to the evaporation chamber, so as to transfer the heat of the heat generating device to the heat sink. The liquid cooling working medium in the evaporation chamber is heated and vaporized into gaseous cooling working medium, so that the gaseous cooling working medium can flow in the condenser, thereby transferring heat to the second chamber. During heat dissipation, the front of the heat dissipation shell is air inlet, and air outlet is from two different sides, so as to form two air ducts in the second chamber, and the length of the two air ducts is less than the height or width of the second chamber, so as to shorten the heat dissipation path, reduce the accumulation of heat in the air duct, and thus improve the heat dissipation capacity of the power converter.

[0009] The power converter described above can be in a hanging state in use, i.e. the first chamber and the second chamber are arranged side by side in a horizontal direction. In the use state of the power converter, the first side plate can be located at the top of the power converter in the direction of gravity, and the second side plate can be located at the bottom of the power converter in the direction of gravity. Therefore, the first side plate and the second side plate are arranged opposite to each other, and the two air outlets are located at the top and the bottom of the power converter respectively, so as to form a heat dissipation path with air inlet at the front, air outlet at the top and air outlet at the bottom.

[0010] The at least one heating device includes a first heating device and a second heating device. The partition plate is provided with a first opening and a second opening. The at least one heat sink includes a first heat sink and a second heat sink. Specifically, the first heat sink includes a first evaporation cavity and a first condenser. The first evaporation cavity covers the first opening and is fixedly connected to the partition plate. The first heating device is attached to the first evaporation cavity. The first condenser is located between the air inlet and the first air outlet. The second heat sink includes a second evaporation cavity and a second condenser. The second evaporation cavity covers the second opening and is fixedly connected to the partition plate. The second heating device is attached to the second evaporation cavity. The second condenser is located between the air inlet and the second air outlet. In this scheme, the two heat sinks respectively dissipate heat from the heating devices in the first chamber, and the two heat sinks are respectively located in independent air ducts. In this way, the airflow carries away the heat transferred to the heating devices through the two air ducts, which can reduce the length of the air ducts, thereby improving the heat dissipation efficiency and improving the heat cascade phenomenon.

[0011] The second chamber can also be provided with a second fan to accelerate the gas flow rate in the second chamber to improve the heat dissipation efficiency. Specifically, the air outlet direction of the first fan is arranged towards the first condenser. The air outlet direction of the first fan is arranged at a first included angle with the plane of the top plate, and the first included angle is less than 90 degrees. The air outlet direction of the second fan is arranged towards the second condenser. The air outlet direction of the second fan is arranged at a second included angle with the plane of the top plate, and the second included angle is less than 90 degrees. In this way, the first fan can directly blow air to the first condenser, and the second fan can directly blow air to the second condenser, while shortening the distance between the fan and the condenser to shorten the entire heat dissipation path length. Further, the fan can adopt an axial fan or a centrifugal fan to increase the air volume of the fan.

[0012] In the power converter of the present application, the air outlet direction of the first fan can be perpendicular to the partition plate. In this way, the airflow blown out from the first fan spreads to the surroundings of the second chamber in the process of flowing towards the partition plate, thereby carrying away the surface heat of the partition plate.

[0013] The heat sink is a two-phase heat sink, and specifically, the condenser includes a plurality of parallel arranged condensing flat tubes. In the plurality of condensing flat tubes, the gap between two adjacent condensing flat tubes is arranged towards the first air outlet or the second air outlet. The plurality of condensing flat tubes are in communication with the evaporation cavity to enable the cooling working medium to flow between the evaporation cavity and the condensing flat tubes. When the cooling working medium in the evaporation cavity is heated, the cooling working medium vaporizes and flows towards the condensing flat tubes, thereby transferring heat to the condensing flat tubes. The airflow passes through the gap between the plurality of condensing flat tubes, which can carry away the surface heat of the condensing flat tubes. Such a structure design can increase the contact area between the heat sink and the airflow, thereby improving the heat dissipation efficiency.

[0014] The condenser has a plurality of flat tube fins arranged in parallel between two adjacent flat condensing tubes. In the plurality of flat tube fins, the gap between two adjacent flat tube fins is oriented in the same direction as the gap between two adjacent flat condensing tubes. When the first fan rotates, the external airflow enters from the air inlet, and part of the external airflow flows out from the first air outlet or the second air outlet after passing through the gap between two adjacent flat tube fins. In this scheme, the plurality of flat tube fins are connected to the flat condensing tubes, so that the heat of the flat condensing tubes can be transferred to the flat tube fins. When the airflow passes through the gap between two adjacent flat condensing tubes, it also passes through the gap between two adjacent flat tube fins, thereby increasing the contact area of the condenser with the airflow and further improving the heat dissipation efficiency.

[0015] The heat sink can further include a plurality of heat dissipation fins. The heat dissipation fins are fixedly connected to the side surface of the evaporation cavity facing the top plate, and the heat dissipation fins are arranged adjacent to the condenser. In the plurality of heat dissipation fins, the gap between two adjacent heat dissipation fins is oriented in the same direction as the gap between two adjacent flat condensing tubes. In this scheme, the arrangement of the heat dissipation fins can increase the heat dissipation area of the heat sink and reduce the surface temperature of the second chamber and the condenser, thereby improving the heat dissipation efficiency of the heat sink.

[0016] The first chamber can be provided with a first heat exchanger, and the partition plate is provided with a third opening opposite to the first fan. The first heat exchanger covers the third opening, and the first heat exchanger is fixedly connected to the partition plate. When the heat generating device causes the temperature in the first chamber to rise, the first heat exchanger can be used to dissipate heat from the inside of the first chamber. When the first fan is working, part of the airflow in the second chamber enters the first heat exchanger through the third opening, and the first heat exchanger can be heat exchanged. In this way, the first heat exchanger can increase the heat exchange area in the first chamber to improve the heat dissipation efficiency of the power converter.

[0017] The second chamber can further be provided with a second heat exchanger. The second heat exchanger is located on the side of the at least one heat sink facing the first air outlet or the second air outlet. The second heat exchanger can increase the heat exchange area in the second chamber to improve the heat dissipation efficiency of the power converter.

[0018] The at least one heat sink has a third heat exchanger on the side facing away from the first chamber. The third heat exchanger can increase the heat exchange area in the second chamber to improve the heat dissipation efficiency of the power converter.

[0019] In one possible implementation, the case further has a third fan. The third fan can be placed at any position in the first chamber to maintain the uniformity of the internal temperature of the first chamber and avoid local overheating that affects the operation of electronic components.

[0020] In a possible implementation, the cabinet further has a circuit board, and the circuit board is opposite to the partition plate. The at least one heat generating component is located between the circuit board and the partition plate, and the heat generating component is connected to the circuit board. The second chamber further has a magnetic component arranged close to the first air outlet or the second air outlet, and the magnetic component is fixedly connected to the partition plate. The partition plate is provided with a fourth opening, and the magnetic component passes through the fourth opening and is connected to the circuit board. When the gas in the second chamber flows, the gas flowing in from the air inlet can directly take away the heat of the magnetic component, or the gas flowing in from the air inlet can take away the heat of the magnetic component after passing through the condenser.

[0021] In a possible implementation, the top plate is provided with a wind deflector on a side surface facing the condenser, and the wind deflector is opposite to the condenser. The wind deflector can shorten the gap between the condenser and the top plate, and can guide the airflow to the condenser, thereby improving the heat dissipation performance. BRIEF DESCRIPTION OF DRAWINGS

[0022] FIG. 1 is a schematic diagram of an application scenario of a photovoltaic system according to an embodiment of the present application;

[0023] FIG. 2 is a side sectional view of an inverter according to an embodiment of the present application in a hanging state;

[0024] FIG. 3 is a side sectional view of an inverter according to an embodiment of the present application;

[0025] FIG. 4 is a top sectional view of an inverter according to an embodiment of the present application;

[0026] FIG. 5 is a structural diagram of a heat dissipating device and a heat generating component of the inverter in FIG. 2;

[0027] FIG. 6 is a side sectional view of the heat dissipating device and the heat generating component in FIG. 5;

[0028] FIG. 7 is another side sectional view of an inverter according to an embodiment of the present application;

[0029] FIG. 8 is another side sectional view of an inverter according to an embodiment of the present application;

[0030] FIG. 9 is a structural diagram of a heat dissipating device and a heat generating component of the inverter in FIG. 8;

[0031] FIG. 10 is a side sectional view of the heat dissipating device and the heat generating component in FIG. 9;

[0032] FIG. 11 is another side sectional view of an inverter according to an embodiment of the present application;

[0033] FIG. 12 is another side sectional view of an inverter according to an embodiment of the present application;

[0034] FIG. 13 is another side sectional view of an inverter according to an embodiment of the present application;

[0035] Fig. 14 is another side sectional view of the inverter provided by the embodiments of the present application;

[0036] Fig. 15 is another side sectional view of the inverter provided by the embodiments of the present application;

[0037] Fig. 16 is another side sectional view of the inverter provided by the embodiments of the present application;

[0038] Fig. 17 is another side sectional view of the inverter provided by the embodiments of the present application;

[0039] Fig. 18 is another side sectional view of the inverter provided by the embodiments of the present application;

[0040] Fig. 19 is another side sectional view of the inverter provided by the embodiments of the present application;

[0041] Fig. 20 is another side sectional view of the inverter provided by the embodiments of the present application;

[0042] Fig. 21 is another side sectional view of the inverter provided by the embodiments of the present application;

[0043] Fig. 22 is another side sectional view of the inverter provided by the embodiments of the present application;

[0044] Fig. 23 is a schematic view of the second heat exchanger and the third heat exchanger provided by the embodiments of the present application.

[0045] Reference signs: 1-photovoltaic system 2-photovoltaic assembly 3-power grid 4-load 5-wall 10-power converter 20-inverter 21-first chamber 22-second chamber 23-baffle 24-top plate 25-first side plate 26-second side plate 27-air inlet 28-first air outlet 29-second air outlet 31-heating device 32-fan 33-radiator 34-evaporation chamber 35-condenser 36-condenser flat tube 37-flat tube fin 38-cooling working medium 39-radiation fin 40-circuit board 41-magnetic device 42-first heat exchanger 43-second heat exchanger 44-third fan 45-shield 46-third heat exchanger 47-bracket 48-opening 321-first fan 322-second fan 331-first radiator 332-second radiator 333-first evaporation chamber 334-first condenser 335-second evaporation chamber 336-second condenser DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be described in further detail below with reference to the drawings.

[0047] It should be noted that the terms "comprises", "comprising", "includes", "including", "has", "having" and the like are used in the detailed description and in the claims of this application to mean that the mentioned features, integers, steps and / or components are present, but not excluding the presence of one or more additional features, integers, steps, components and / or groups thereof. The term "a" or "an" entity refers to one or more of that entity. The terms "plurality" and "a plurality" as used herein refer to two or more than two.

[0048] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" or "in a various embodiment" or "in at least one embodiment" in various places throughout this specification are not necessarily referring to the same embodiment, unless otherwise specified. The terms "including", "comprising", "having" and the like are meant to be interpreted broadly to encompass the inclusion of one or more features, integers, steps, components, or groups thereof. The term "consisting of" means "including and limited to".

[0049] In this application, the terms "first", "second", etc. are used only to describe different instances of the same thing, and are not used to denote or imply relative importance or a number of the indicated technical features. Thus, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality" is two or more, unless otherwise specified.

[0050] In addition, in this document, the terms "top", "bottom", "up", "down", and the like are defined with respect to the orientation of the structure shown in the drawings, and it should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the orientation of the structure placed.

[0051] In order to facilitate the understanding of the power converter provided in the embodiments of the present application, the application scenarios thereof are described below. The power converter of the present application can be applied in power supply systems and power generation systems. Taking a photovoltaic system as an example, the photovoltaic system can be used in two application scenarios of household power stations and industrial photovoltaic power stations, and the photovoltaic system includes a power converter. An inverter can convert solar energy into electric energy to supply a power grid or a load. FIG. 1 is a schematic diagram of an application scenario of a photovoltaic system provided in an embodiment of the present application. As shown in FIG. 1, the photovoltaic system 1 is applied in a household power station. Specifically, a photovoltaic component 2 is used to convert light energy into electric energy. The power converter 10 includes an inverter. An input end of the inverter is connected with the photovoltaic component 2 as a direct-current power supply. An output end of the inverter is connected with a power grid 3 / load 4 through a power line. The inverter is used to convert direct-current electric energy from the photovoltaic component 2 into alternating-current electric energy, and deliver the alternating-current electric energy to the power grid 3 / load 4. Of course, the inverter can also be connected with an energy storage device. The alternating-current electric energy converted by the inverter can also be delivered to the energy storage device for energy storage.

[0052] With the increasing power of the inverter, the heat generated by the circuit board assembly inside the inverter cabinet also increases, which leads to the increase of the temperature inside the cabinet, which is very unfavorable to the heat generating components arranged inside the cabinet. Especially for some power modules with high heat consumption density, the failure risk of the power modules is significantly increased under the influence of continuous high temperature.

[0053] In the prior art, when the inverter is hung on a wall, air enters the inverter from the bottom of the inverter and is discharged from the top of the inverter, forming an air duct from bottom to top. When the gas flows in the air duct, the flowing gas will sequentially take away the heat of the heat generating components. However, this heat dissipation path will cause the heat dissipation of the heat generating components located upstream of the air duct (i.e., the area close to the air inlet) to be faster, and the heat dissipation of the heat dissipation components located downstream of the air duct (i.e., the area close to the air outlet) to be slower, and the heat may accumulate downstream of the air duct, so that the internal cabinet of the inverter cannot be effectively cooled, and thus the service life and reliability of various components inside the cabinet cannot be guaranteed, which will affect the service life of the inverter as a whole.

[0054] In view of the above problems, the embodiments of the present application can realize effective heat dissipation of the inverter, reduce the failure risk of the power modules inside the inverter, improve the use reliability of the inverter, and thus improve the service life of the inverter by improving the heat dissipation mode of the inverter and the layout of the heat generating components.

[0055] Fig. 2 is a side view of the inverter in a hanging state according to an embodiment of the present application, and Fig. 3 is a side view of the inverter according to an embodiment of the present application. As shown in Figs. 2 and 3, the inverter 20 can be installed on a wall surface 5. Specifically, the inverter 20 can be hung on the wall surface 5 by a hanging bracket. The wall surface 5 can be a wall, a device housing, or an auxiliary installation surface. The inverter 20 according to the present application can be installed on the wall alone, or two inverters 20 can be installed back to back through the auxiliary installation surface.

[0056] Please continue to refer to Figs. 2 and 3, the inverter 20 includes a cabinet and a plurality of devices located in the cabinet. Specifically, the inside of the cabinet is provided with a partition plate 23, and the partition plate 23 divides the cabinet into a first chamber 21 and a second chamber 22 arranged adjacent to each other. The second chamber 22 includes a top plate 24 and a plurality of side plates, wherein the top plate 24 is arranged opposite to the partition plate 23, and the plurality of side plates are connected in sequence and between the top plate 24 and the partition plate 23, so that the top plate 24, the partition plate 23 and the plurality of side plates enclose the second chamber 22. At least one heat generating device 31 is arranged in the first chamber 21.

[0057] As shown in Fig. 3, in the second chamber 22, the top plate 24 is provided with an air inlet 27. The plurality of side plates include a first side plate 25 and a second side plate 26, the first side plate 25 is provided with a first air outlet 28, and the second side plate 26 is provided with a second air outlet 29. Therefore, the second chamber 22 has two air ducts, i.e., a first air duct formed between the air inlet 27 and the first air outlet 28, and a second air duct formed between the air inlet 27 and the second air outlet 29. When the inverter 20 is hung, along the direction of gravity (e.g., the vertical direction in Fig. 2), the first air outlet 28 can be located at the top of the inverter 20, and the second air outlet 29 can be located at the bottom of the inverter 20. Alternatively, along the direction of gravity, the first air outlet 28 can be located at the right side of the inverter 20, and the second air outlet 29 can be located at the left side of the inverter 20. Alternatively, along the direction of gravity, the first air outlet 28 can be located at the top of the inverter 20, and the second air outlet 29 can be located at the left side of the inverter 20. Alternatively, along the direction of gravity, the first air outlet 28 can be located at the right side of the inverter 20, and the second air outlet 29 can be located at the bottom of the inverter 20. That is, the inverter 20 takes in air from the back (i.e., the outer surface of the top plate 24) and discharges air from the side plates, as shown by the dashed lines in Fig. 3. For ease of description, the following description will be given by taking the first air outlet 28 located at the top of the inverter 20 and the second air outlet 29 located at the bottom of the inverter 20 as an example.

[0058] Figure 4 is a top view of the inverter according to an embodiment of the present application. As shown in Figures 3 and 4, in the inverter 20 according to the present application, the second chamber 22 is provided with at least one fan 32 and at least one heat sink 33. The at least one fan 32 is installed in the second chamber 22 and is arranged close to the air inlet 27. The air inlet side of the fan 32 faces the air inlet 27. Figure 5 is a schematic view of the heat sink and the heat generating device of the inverter shown in Figure 2. As shown in Figure 5, the heat sink 33 specifically includes an evaporation cavity 34 and a condenser 35. The partition plate 23 is provided with an opening, and the evaporation cavity 34 covers the opening and is fixedly connected to the partition plate 23, so that the first chamber 21 forms a chamber with a high protection level. The heat generating device 31 is attached to the evaporation cavity 34. The evaporation cavity 34 is provided with a cooling medium. The condenser 35 is fixedly connected to a side surface of the evaporation cavity 34 facing the top plate 24 and is in communication with the evaporation cavity 34, so that the cooling medium in the evaporation cavity 34 can flow in the condenser 35 after vaporization. The condenser 35 can be located between the air inlet 27 and the first air outlet 28, or the condenser 35 can be located between the air inlet 27 and the second air outlet 29. It should be noted that, in order to facilitate the illustration of the positional relationship between the heat generating device 31 and the heat sink 33, the partition plate is omitted in Figure 5.

[0059] In the above embodiment, the heat generating device 31 in the first chamber 21 can be in direct contact with the evaporation cavity 34, so as to directly transfer the heat of the heat generating device 31 to the evaporation cavity 34. The cooling medium in the evaporation cavity 34 is heated and vaporized into a gaseous state, so that the gaseous cooling medium can flow in the condenser 35, thereby transferring heat to the second chamber 22. The provision of the fan 32 can increase the gas flow rate in the second chamber 22, thereby improving the heat dissipation capacity of the inverter 20. The air outlet direction of the fan 32 can be perpendicular to the partition plate 23, so that the air flow blown out of the fan 32 spreads to the periphery of the second chamber 22 in the process of flowing toward the partition plate 23, thereby removing the surface heat of the partition plate 23.

[0060] In the inverter 20 according to the present application, the second chamber 22 has two air ducts. During heat dissipation, the front of the second chamber 22 is air-inlet, and air is outlet from different two sides, so as to discharge the heat in the second chamber 22 from the different two air ducts. The provision of the air ducts can shorten the length of the air ducts, thereby reducing the accumulation of heat in the air ducts, and further improving the heat dissipation capacity of the power converter 10.

[0061] Fig. 6 is a side view of the heat sink and the heat generating device of Fig. 5. As shown in Figs. 5 and 6, the condenser 35 includes a plurality of condensing flat tubes 36 arranged in parallel. The condensing flat tubes 36 are in communication with the evaporation cavity 34, so that the cooling medium 38 can flow between the evaporation cavity 34 and the condensing flat tubes 36. A plurality of flat tube fins 37 are arranged between two adjacent condensing flat tubes 36. When the plurality of condensing flat tubes 36 are arranged, the gap between two adjacent condensing flat tubes is arranged towards the first air outlet 28 or the second air outlet 29. In order to facilitate the arrangement, the arrangement direction of the plurality of condensing flat tubes 36 is the first direction, which can be parallel to the partition plate 23. The arrangement direction of the plurality of flat tube fins 37 can also be the second direction, which can be perpendicular to the partition plate 23. That is, if the first air outlet 28 is located at the top of the inverter 20 and the second air outlet 29 is located at the bottom of the inverter 20 along the direction of gravity (e.g., the vertical direction in Fig. 2), the arrangement direction of the plurality of condensing flat tubes 36 can be the second direction. Alternatively, the first air outlet 28 can be located at the right side of the inverter 20 and the second air outlet 29 can be located at the left side of the inverter 20 along the direction of gravity, and the arrangement direction of the plurality of condensing flat tubes 36 can be the first direction. In addition, the condensing flat tubes 36 and the flat tube fins 37 can be arranged perpendicularly, and the gap between two adjacent condensing flat tubes 36 and the gap between two adjacent flat tube fins 37 are arranged towards the same direction.

[0062] When the cooling medium 38 in the evaporation cavity 34 is heated and vaporized, the vaporized cooling medium 38 can flow in the condensing flat tubes 36, so as to transfer the heat of the partition plate 23 to the condensing flat tubes 36. The vaporized cooling medium 38 transfers the heat to the flat tube fins 37 in the condensing flat tubes 36. When the fan 32 is working, the gas in the air duct flows from the side of the condensing flat tubes close to the air inlet 27 to the side close to the air outlet through the gaps between the flat tube fins 37, so as to take away the heat of the flat tube fins 37, thereby achieving heat dissipation. Then, the cooling medium 38 is cooled and condensed into liquid, and the liquid cooling medium 38 can flow from the condensing flat tubes 36 back to the evaporation cavity 34, thereby forming a heat dissipation circulation path.

[0063] Please continue to refer to FIG. 5 and FIG. 6, in this embodiment, the heat sink 33 further comprises a plurality of heat dissipation fins 39. The heat dissipation fins 39 are arranged in parallel along a direction parallel to the partition plate 23. The heat dissipation fins 39 are fixedly connected to a side surface of the evaporation cavity 34 facing the top plate 24, and the heat dissipation fins 39 are arranged adjacent to the condenser 35. The gap between two adjacent heat dissipation fins 39 is oriented in the same direction as the gap between two adjacent condenser flat tubes 36. Further, the arrangement direction of the heat dissipation fins 39 is the same as the arrangement direction of the condenser flat tubes 36, and the gap between the heat dissipation fins 39 is through the gap between two adjacent condenser flat tubes 36, thereby increasing the gas flow through the gap between the condenser flat tubes 36. The arrangement of the heat dissipation fins 39 can increase the heat dissipation area of the heat sink 33, and reduce the surface temperature of the second cavity 22 and the condenser 35, thereby improving the heat dissipation efficiency of the heat sink 33. When the inverter 20 is in the hanging state, the cooling working medium 38 accumulates at the bottom of the evaporation cavity 34 due to the action of gravity. Therefore, in order to improve the heat dissipation efficiency of the cooling working medium 38, the heat dissipation fins 39 can be arranged close to the bottom of the evaporation cavity 34. In the second cavity 22, the heat dissipation fins 39 can be arranged close to the condenser 35 near the air inlet 27, and the heat dissipation fins 39 are arranged opposite to the fan 32. That is, the heat sink 33 is located above the fan 32. Alternatively, the heat dissipation fins 39 can also be arranged away from the air inlet 27 of the condenser 35, that is, the heat sink 33 is located below the fan 32.

[0064] FIG. 7 is another side view of the inverter according to an embodiment of the present application. As shown in FIG. 7, the first cavity 21 further comprises a circuit board 40, which is arranged opposite to the partition plate 23. The heat generating device 31 is located between the circuit board 40 and the partition plate 23, and the heat generating device 31 is connected to the circuit board. The heat generating device 31 can include power modules, specifically including chips, resistors, capacitors, transformers and various power devices. These power devices can be connected in a certain functional combination to achieve a specific function. Among them, the chip can include insulated gate bipolar transistor (IGBT), metal-oxide-semiconductor field-effect transistor (MOSFET) or power transistor, etc. In addition, the side of the circuit board 40 away from the partition plate 23 can be provided with a surface mount resistor and a surface mount capacitor.

[0065] Please continue to refer to FIG. 7, the second chamber 22 can also be provided with at least one magnetic device 41. In the aforementioned at least one magnetic device 41, each magnetic device 41 is arranged close to the first air outlet 28 or the second air outlet 29. The magnetic device 41 is fixedly connected to the partition plate 23, the partition plate 23 is provided with a fourth opening, and the magnetic device 41 passes through the fourth opening to be connected with the circuit board 40. The magnetic device 41 is located in the first air duct or the second air duct, when the gas in the second chamber 22 flows, the gas flow entering from the air inlet 27 can directly take away the heat of the magnetic device 41, or the gas flow entering from the air inlet 27 can take away the heat of the magnetic device 41 after passing through the condenser 35. In this embodiment, the magnetic device 41 can be a direct current boost inductor component or an inverter inductor component.

[0066] Fig. 8 is another side sectional view of the inverter according to an embodiment of the present application, Fig. 9 is a structural schematic view of the heat sink and the heat generating device in Fig. 8, and Fig. 10 is a side sectional view of the heat sink and the heat generating device in Fig. 9. As shown in Figs. 8, 9 and 10, in one embodiment, the at least one heat generating device 31 includes a plurality of heat generating devices 31, and the plurality of heat generating devices 31 can be arranged in two groups. The at least one heat sink 33 can include a first heat sink 331 and a second heat sink 332. The first heat sink 331 includes a first evaporation cavity 333 and a first condenser 334, and the second heat sink 332 includes a second evaporation cavity 335 and a second condenser 336. The partition plate 23 is provided with a first opening and a second opening, the first evaporation cavity 333 covers the first opening, the second evaporation cavity 335 covers the second opening, and the first evaporation cavity 333 and the second evaporation cavity 335 are fixedly connected to the partition plate 23 respectively. The first evaporation cavity 333 and the second evaporation cavity 335 can be arranged side by side in the second chamber 22. The first condenser 334 is located between the air inlet 27 and the first air outlet 28, the second condenser 336 is located between the air inlet 27 and the second air outlet 29, and the fan 32 is located between the first condenser 334 and the second condenser 336. That is, the first condenser 334 is located in the first air duct, and the second condenser 336 is located in the second air duct. One of the two groups of heat generating devices 31 is in contact with the first evaporation cavity 333, and the other group of heat generating devices 31 is in contact with the second evaporation cavity 335. That is, one of the two groups of heat generating devices 31 is cooled by the first heat sink 331, and the other group of heat generating devices 31 is cooled by the second heat sink 332. During cooling, the fan 32 blows the gas outside the inverter 20 from the air inlet 27 between the first heat sink 331 and the second heat sink 332. Among the gas entering the second chamber 22, part of the gas passes through the first condenser 334 in the first air duct, thereby taking away the heat transferred from one of the two groups of heat generating devices 31 to the first heat sink 331; and the other part of the gas passes through the second condenser 336 in the second air duct, thereby taking away the heat transferred from the other group of heat generating devices 31 to the second heat sink 332. In this embodiment, two heat sinks 33 are used to cool the heat generating devices 31 respectively, and the two heat sinks 33 are located in separate air ducts. In this way, the airflow passing through the two air ducts takes away the heat transferred into the second chamber 22, which can reduce the heat dissipation path, thereby improving the heat dissipation efficiency and improving the heat cascade phenomenon.

[0067] Fig. 11 is another side view of the inverter according to an embodiment of the present application. As shown in Fig. 11, in the above embodiment, the at least one fan 32 includes a first fan 321 and a second fan 322 arranged adjacently. The first fan 321 and the second fan 322 are arranged side by side at the air inlet 27 and share the air inlet 27. The air outlet side of the first fan 321 can face the first condenser 334, and the air outlet side of the second fan 322 can face the second condenser 336. In this way, the first fan 321 can cool the first heat sink 331, and the second fan 322 can cool the second heat sink 332, thereby accelerating the flow rate of the gas in the second chamber 22 to improve the cooling efficiency.

[0068] In addition, the air outlet direction of the fan 32 can be arranged at an acute angle with respect to the plane of the top plate 24. For example, in an embodiment, the air outlet direction of the first fan 321 can be arranged at a first included angle with respect to the plane of the top plate 24, and the first included angle is less than 90 degrees. The air outlet direction of the second fan 322 can be arranged at a second included angle with respect to the plane of the top plate 24, and the second included angle is less than 90 degrees. In this way, the first fan 321 can directly blow the gas flow to the first condenser 334, and the second fan 322 can directly blow the gas flow to the second condenser 336, while shortening the distance between the fan 32 and the condenser 35 to shorten the entire cooling path. Further, the fan 32 can be an axial fan to increase the air volume of the fan 32.

[0069] Further, in order to accelerate the cooling of the heat generating device 31, a first heat exchanger 42 can also be arranged in the first chamber 21. Fig. 12 is another side view of the inverter according to an embodiment of the present application. As shown in Fig. 12, the first heat exchanger 42 can be fixedly connected to the partition plate 23. The partition plate 23 is provided with a third opening, the third opening is arranged opposite to the fan 32, and the first heat exchanger 42 covers the third opening and is fixedly connected to the partition plate 23. That is, when the heat generating device 31 causes the temperature in the first chamber 21 to rise, the first heat exchanger 42 can be used to cool the inside of the first chamber 21. When the fan 32 is working, a part of the gas flow enters the first heat exchanger 42 through the opening, which can cool the first heat exchanger 42. In this way, the first heat exchanger 42 can increase the heat exchange area in the first chamber 21 to improve the cooling efficiency.

[0070] FIG. 13 is another side view of the inverter according to an embodiment of the present application. As shown in FIG. 13, the second chamber 22 can also be provided with a second heat exchanger 43, which can be used to dissipate heat from the second chamber 22. As shown in FIG. 13, in one embodiment, the second heat exchanger 43 and the condenser 35 can be located on both sides of the air inlet 27. For example, the condenser 35 can be located in the first air duct, and the second heat exchanger 43 can be located in the second air duct. In this way, part of the air flow entering the air inlet 27 is discharged from the first air outlet 28 after passing through the condenser 35 in the first air duct, thereby taking away the heat of the heat sink 33; another part of the air flow is discharged from the second air outlet 29 after passing through the second heat exchanger 43 in the second air duct, thereby taking away the heat of the second heat exchanger 43. FIG. 14 is another side view of the inverter according to an embodiment of the present application. As shown in FIG. 14, in another embodiment, the second heat exchanger 43 can also be located on the side of the condenser 35 away from the air inlet 27. For example, when the condenser 35 is located in the second air duct, the second heat exchanger 43 can be located between the condenser 35 and the second air outlet 29. In this way, the air flow can also take away the heat of the second heat exchanger 43 after passing through the condenser 35. Therefore, the second heat exchanger 43 can increase the heat exchange area in the second chamber 22 to improve the heat dissipation efficiency.

[0071] In addition, when the first heat sink 331 and the second heat sink 332 are provided in the second chamber 22, the second heat exchanger 43 can be located in the first air duct together with the first heat sink 331. Specifically, the second heat exchanger 43 can be located on the side of the first heat sink 331 close to the air inlet 27, or the second heat exchanger 43 can be located on the side of the first heat sink 331 close to the first air outlet 28. Alternatively, the second heat exchanger 43 can also be located in the second air duct together with the second heat sink 332. Specifically, the second heat exchanger 43 can be located on the side of the second heat sink 332 close to the air inlet 27, or the second heat exchanger 43 can be located on the side of the second heat sink 332 close to the second air outlet 29.

[0072] In the above embodiment, the second heat exchanger 43 and the heat sink 33 are arranged in the vertical direction to form a two-stage heat dissipation in cascade. The second heat exchanger 43 not only simplifies the layout of the devices inside the inverter 20, but also increases the heat exchange area in the second chamber 22 without increasing the size of the inverter 20 in the horizontal direction (i.e., in the direction perpendicular to the partition plate 23).

[0073] In some other embodiments, the second heat exchanger 43 can also be arranged horizontally with the heat sink 33 to form a double-stage heat dissipation in parallel. FIG. 15 is another side view of the inverter according to an embodiment of the present application, and FIG. 16 is another side view of the inverter according to an embodiment of the present application. As shown in FIG. 15 and FIG. 16, the second heat exchanger 43 can also be arranged on the side of the heat sink 33 facing away from the first chamber 21, and the second heat exchanger 43 is arranged between the heat sink 33 and the inner wall of the second chamber 22 in a direction perpendicular to the partition 23. In this embodiment, the air flow blown from the air outlet side of the fan 32 can pass through both the second heat exchanger 43 and the heat sink 33, which can increase the heat exchange area in the second chamber 22 without increasing the length of the air duct, and further improve the heat cascade phenomenon.

[0074] FIG. 17 is another side view of the inverter according to an embodiment of the present application. As shown in FIG. 17, a third fan 44 can also be arranged in the first chamber 21. The third fan 44 can be placed at any position in the first chamber 21 to improve the uniformity of the internal temperature of the first chamber 21 and avoid local overheating that affects the operation of the electronic components.

[0075] FIG. 18 is another side view of the inverter according to an embodiment of the present application. As shown in FIG. 18, in the present application, in order to make the air flow blown by the fan 32 pass through the heat sink 33 as much as possible, the side surface of the top plate 24 facing the condenser 35 can be provided with a wind shield 45, and the wind shield 45 is arranged opposite to the condenser 35. The wind shield 45 can shorten the gap between the condenser 35 and the top plate 24, and the side of the wind shield 45 close to the air inlet 27 can be arranged as an inclined surface to guide the air flow to the condenser 35.

[0076] FIG. 19 is another side view of the inverter according to an embodiment of the present application. As shown in FIG. 19, in some embodiments, when the at least one heat sink 33 includes a first heat sink 331 and a second heat sink 332, a second heat exchanger 43 can be arranged in the second chamber 22. The second heat exchanger 43 can be arranged on the side of the second condenser 336 close to the second air outlet 29, and the second heat exchanger 43 is arranged in parallel with the heat dissipation fins 39 of the second heat sink 332 in a direction perpendicular to the partition 23.

[0077] FIG. 20 is another side view of the inverter according to an embodiment of the present application. As shown in FIG. 20, in some other embodiments, the second heat exchanger 43 can be arranged on the side of the heat dissipation fins 39 of the second heat sink 332 close to the second air outlet 29.

[0078] FIG. 21 is another side view of the inverter according to an embodiment of the present application. As shown in FIG. 21, in some other embodiments, the second heat exchanger 43 can be located on the side of the first heat sink 331 close to the first air outlet 28. Further, the second heat exchanger 43 can be located between the magnetic device 41 and the first heat sink 331.

[0079] FIG. 22 is another side view of the inverter according to an embodiment of the present application. As shown in FIG. 22, when the at least one heat sink 33 includes the first heat sink 331 and the second heat sink 332, the second heat exchanger 43 and the third heat exchanger 46 can be arranged in the second chamber 22. The second heat exchanger 43 is arranged on the side of the first heat sink 331 away from the first chamber 21, and the second heat exchanger 43 is located between the first heat sink 331 and the inner wall of the second chamber 22. The third heat exchanger 46 is arranged on the side of the second heat sink 332 away from the first chamber 21, and the third heat exchanger 46 is located between the second heat sink 332 and the inner wall of the second chamber 22.

[0080] In some embodiments, the second heat exchanger 43 and the third heat exchanger 46 can be independent of each other, and each is a U-shaped heat exchanger. That is, a portion of the second heat exchanger 43 is located between the first heat sink 331 and the inner wall of the second chamber 22, and the opposite sides of the second heat exchanger 43 extend towards the first heat sink 331 in a direction perpendicular to the partition 23 and pass through the partition 23 to communicate with the first chamber 21. Similarly, a portion of the third heat exchanger 46 is located between the second heat sink 332 and the inner wall of the second chamber 22, and the opposite sides of the third heat exchanger 46 extend towards the second heat sink 332 in a direction perpendicular to the partition 23 and pass through the partition 23 to communicate with the first chamber 21.

[0081] In some other embodiments, the second heat exchanger 43 and the third heat exchanger 46 can be fixedly connected. FIG. 23 is a schematic view of the second heat exchanger and the third heat exchanger according to an embodiment of the present application. As shown in FIG. 23, the second heat exchanger 43 and the third heat exchanger 46 are fixedly connected by two brackets 47 arranged opposite to each other and located on the two sides of the second heat exchanger 43 and the third heat exchanger 46. Each bracket 47 is provided with an opening 48 passing through the partition 23 and communicating with the first chamber 21.

[0082] The above merely describes some embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A power converter, characterized by, The application relates to a power converter, which comprises a cabinet, a partition plate arranged in the cabinet, a first chamber and a second chamber formed by the partition plate, at least one heating device arranged in the first chamber, a top plate arranged opposite to the partition plate in the second chamber, a plurality of side plates connected in sequence between the partition plate and the top plate, an air inlet arranged on the top plate, a first side plate and a second side plate, a first air outlet arranged on the first side plate, a second air outlet arranged on the second side plate, a first fan arranged in the air inlet, at least one radiator, a first evaporating cavity and a first condenser of each of the at least one radiator, a cooling medium arranged in the first evaporating cavity, the first condenser fixedly connected to a side surface of the first evaporating cavity and communicating with the first evaporating cavity, the first condenser arranged between the air inlet and the first air outlet or between the air inlet and the second air outlet, a second fan arranged in the air inlet, the air outlet direction of the first fan being arranged towards the first condenser and being arranged at a first angle smaller than 90 degrees with the plane of the top plate, the air outlet direction of the second fan being arranged towards the second condenser and being arranged at a second angle smaller than 90 degrees with the plane of the top plate, and the air outlet direction of the first fan being perpendicular to the partition plate. In the use state of the power converter, the first side plate is arranged at the top of the power converter along the direction of gravity, and the second side plate is arranged at the bottom of the power converter along the direction of gravity. The at least one heating device comprises a first heating device and a second heating device, the partition plate is provided with a first opening and a second opening, the at least one radiator comprises a first radiator and a second radiator, the first radiator comprises a first evaporating cavity and a first condenser, the first evaporating cavity covers the first opening and is fixedly connected to the partition plate, the first heating device is attached to the first evaporating cavity, and the first condenser is arranged between the air inlet and the first air outlet, the second radiator comprises a second evaporating cavity and a second condenser, the second evaporating cavity covers the second opening and is fixedly connected to the partition plate, the second heating device is attached to the second evaporating cavity, and the second condenser is arranged between the air inlet and the second air outlet. The second chamber is further provided with a second fan, and the second fan is arranged in the air inlet.

2. The power converter of claim 1, wherein, The air outlet direction of the first fan is arranged towards the first condenser and is arranged at a first angle smaller than 90 degrees with the plane of the top plate, the air outlet direction of the second fan is arranged towards the second condenser and is arranged at a second angle smaller than 90 degrees with the plane of the top plate, and the air outlet direction of the first fan is perpendicular to the partition plate.

3. The power converter of claim 2, wherein, ​ ​ ​ 4. The power converter of claim 3, wherein, ​ ​ ​ 5. The power converter of any one of claims 1 to 3, wherein, ​ 6. The power converter of any one of claims 1 to 5, wherein, The condenser comprises a plurality of parallel arranged condensing flat tubes; in the plurality of condensing flat tubes, the gap between two adjacent condensing flat tubes is arranged towards the first air outlet or the second air outlet; The plurality of condensing flat tubes are in communication with the evaporation cavity, so that the cooling working medium flows between the evaporation cavity and the condensing flat tubes.

7. The power converter of claim 6, wherein, A plurality of flat tube fins are arranged between the two adjacent condensing flat tubes; in the plurality of flat tube fins, the gap between two adjacent flat tube fins is arranged towards the same direction as the gap between the two adjacent condensing flat tubes.

8. The power converter of claim 7, wherein, The heat sink further comprises a plurality of heat dissipation fins, which are respectively fixedly connected to the side surface of the evaporation cavity towards the top plate, and the plurality of heat dissipation fins are arranged adjacent to the condenser; in the plurality of heat dissipation fins, the gap between two adjacent heat dissipation fins is arranged towards the same direction as the gap between the two adjacent condensing flat tubes.

9. The power converter of any one of claims 1 to 8, wherein, The partition plate is provided with a third opening, which is arranged opposite to the first fan; The first chamber is provided with a first heat exchanger, which covers the third opening and is fixedly connected to the partition plate.

10. The power converter of any one of claims 1 to 9, wherein, The second chamber is provided with a second heat exchanger, which is located on the side of the at least one heat sink towards the first air outlet or the second air outlet.

11. The power converter of any one of claims 1 to 9, wherein, The at least one heat sink is provided with a third heat exchanger on the side away from the first chamber.

12. The power converter of any one of claims 1 to 11, wherein, The first chamber is further provided with a circuit board, which is arranged opposite to the partition plate; the at least one heat generating device is located between the circuit board and the partition plate, and the first heat generating device is connected to the circuit board; The second chamber is further provided with a magnetic device arranged close to the first air outlet or the second air outlet, which is fixedly connected to the partition plate; the partition plate is provided with a fourth opening, and the magnetic device is connected to the circuit board through the fourth opening.

13. The power converter of any one of claims 1 to 12, wherein, The side surface of the top plate towards the condenser is provided with a wind shield, which is arranged opposite to the condenser.

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