Inverter and heat dissipation structure thereof

Abstract

Disclosed in the present application are an inverter and a heat dissipation structure thereof. The heat dissipation structure of an inverter comprises: a first cabinet, a second cabinet, a liquid-cooling radiator and a first liquid-cooling heat exchanger, wherein the first cabinet comprises an electronic cavity; the liquid-cooling radiator is configured to perform heat dissipation on a power module of an inverter power module part, and a cooling liquid channel of the liquid-cooling radiator is in communication with a cooling liquid channel of the first liquid-cooling heat exchanger; the heat dissipation structure of an inverter is provided with a heat dissipation cavity, which is configured to allow air to flow through, so as to cool a cooling liquid in the first liquid-cooling heat exchanger; and the second cabinet comprises a direct-current power distribution cavity, an alternating-current power distribution cavity and a filtering reactance cavity, at least one of the direct-current power distribution cavity, the alternating-current power distribution cavity and the filtering reactance cavity forming a circulation air duct together with the electronic cavity. The heat dissipation structure of an inverter improves the heat dissipation efficiency, reduces heat dissipation costs, and further improves the protection performance of the entire inverter.

Description

Inverter and heat dissipation structure thereof

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 16, 2023, with application number 202323132153.5 and invention name “A inverter and its heat dissipation structure”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of photovoltaic power generation, and more specifically, to an inverter and a heat dissipation structure thereof. Background Art

[0003] In a grid-connected photovoltaic power generation system, the inverter is the interface device that connects the photovoltaic power station to the power grid. The higher the inverter power, the lower the cost per watt, which is more conducive to the photovoltaic power station's grid parity.

[0004] To increase the power of the inverter, the inverter components are modularized to form multiple modular components. These multiple modular components are independent of each other, and typically each modular component dissipates heat independently, resulting in high heat dissipation costs for the entire inverter.

[0005] In summary, how to design the heat dissipation of modular components in an inverter to reduce the heat dissipation cost of the inverter is an urgent problem to be solved by those skilled in the art.

[0006] Summary of the Invention

[0007] In view of this, an object of the present application is to provide an inverter and a heat dissipation structure thereof, so as to reduce the heat dissipation cost of the inverter.

[0008] In order to achieve the above objectives, this application provides the following technical solutions:

[0009] A heat dissipation structure of an inverter comprises: a first cabinet, a second cabinet, a liquid-cooled radiator, and a first liquid-cooled heat exchanger;

[0010] Wherein, the first cabinet includes an electronic cavity, and the electronic cavity is used to set the inverter power module part;

[0011] The liquid-cooled radiator is used to dissipate heat for the power module of the inverter power module part, and the cooling liquid channel of the liquid-cooled radiator is connected to the cooling liquid channel of the first liquid-cooled heat exchanger;

[0012] The heat dissipation structure of the inverter is provided with a heat dissipation cavity, and the heat dissipation cavity is used for allowing air to flow through to cool the coolant in the first liquid-cooled heat exchanger;

[0013] The second cabinet includes a DC distribution cavity, an AC distribution cavity and a filter reactor cavity. The DC distribution cavity is used to set the DC distribution part, the AC distribution cavity is used to set the AC distribution part, and the filter reactor cavity is used to set the reactor. At least one of the DC distribution cavity, the AC distribution cavity and the filter reactor cavity forms a circulating air duct with the electronic cavity.

[0014] Optionally, a second liquid-cooled heat exchanger for cooling the air is provided in the circulating air duct.

[0015] Optionally, the cooling liquid channel of the second liquid-cooled heat exchanger is connected to the cooling liquid channel of the first liquid-cooled heat exchanger.

[0016] Optionally, the DC power distribution cavity, the AC power distribution cavity, the filter reactance cavity and the electronic cavity form the circulating air duct;

[0017] Wherein, in the circulating air duct, the DC distribution cavity, the AC distribution cavity and the electronic cavity are connected in series, and one of the DC distribution cavity and the AC distribution cavity is connected in parallel with the filter reactance cavity.

[0018] Optionally, the second liquid-cooled heat exchanger is located in the electronic cavity; and / or, the second liquid-cooled heat exchanger is located in the filter reactor cavity, and in one of the DC distribution cavity and the AC distribution cavity connected in parallel with the filter reactor cavity.

[0019] Optionally, the DC power distribution cavity, the AC power distribution cavity, the filter reactance cavity and the electronic cavity form the circulating air duct;

[0020] Wherein, in the circulating air duct, the DC distribution cavity, the AC distribution cavity and the electronic cavity are all connected in series with the filter reactance cavity, and the DC distribution cavity and the AC distribution cavity are connected in parallel.

[0021] Optionally, the second liquid-cooled heat exchanger is located in the electronic cavity, and / or the second liquid-cooled heat exchanger is located in the filter reactor cavity.

[0022] Optionally, the second liquid-cooled heat exchanger is located between the device in the electronic cavity and the reactor;

[0023] And / or, the first liquid-cooled heat exchanger and the second liquid-cooled heat exchanger are both arranged in the first cabinet;

[0024] And / or, the first liquid-cooled heat exchanger and the second liquid-cooled heat exchanger are both arranged in the second cabinet.

[0025] Optionally, the DC power distribution cavity, the AC power distribution cavity and the electronic cavity form the circulating air duct;

[0026] The filter reactor cavity and the electronic cavity are not connected, and a third liquid-cooled heat exchanger is provided in the filter reactor cavity, and the third liquid-cooled heat exchanger is used to cool the air in the filter reactor cavity.

[0027] Optionally, the cooling liquid channel of the third liquid-cooled heat exchanger is connected to the cooling liquid channel of the first liquid-cooled heat exchanger.

[0028] Optionally, one of the DC power distribution cavity and the AC power distribution cavity forms the circulating air duct with the electronic cavity, the other is not connected to the electronic cavity, and the filter reactance cavity is not connected to the electronic cavity;

[0029] A third liquid-cooled heat exchanger is provided in the filter reactor cavity, and the third liquid-cooled heat exchanger is used to cool the air in the filter reactor cavity;

[0030] The one of the DC power distribution cavity and the AC power distribution cavity that is not in communication with the electronic cavity is provided with a fourth liquid-cooled heat exchanger for cooling the air inside the cavity.

[0031] Optionally, the cooling liquid channel of the third liquid-cooled heat exchanger is connected to the cooling liquid channel of the first liquid-cooled heat exchanger, and the cooling liquid channel of the fourth liquid-cooled heat exchanger is connected to the cooling liquid channel of the first liquid-cooled heat exchanger.

[0032] Optionally, the first cabinet and the second cabinet are distributed sequentially along the vertical direction;

[0033] And / or, the DC power distribution cavity and the AC power distribution cavity are respectively located on two opposite sides of the filter reactance cavity;

[0034] And / or, the heat dissipation cavity is provided in the first cabinet;

[0035] And / or, the electronic cavity is also used to set a control circuit part.

[0036] Based on the heat dissipation structure of the inverter provided above, the present application further provides an inverter, which includes the heat dissipation structure of the inverter described in any one of the above items.

[0037] Optionally, the inverter includes at least two inverter units;

[0038] Wherein, each of the inverter units includes the heat dissipation structure of the inverter described in any one of the above items; or, each of the inverter units includes: the first cabinet, the second cabinet and the liquid-cooled radiator, and at least two of the inverter units share the first liquid-cooled heat exchanger and the heat dissipation cavity.

[0039] In the heat dissipation structure of the inverter provided in the present application, a heat dissipation cavity is used to dissipate heat for the first liquid-cooled heat exchanger, which can realize forced liquid cooling of the power module, effectively improve the heat dissipation efficiency, facilitate the protection requirements of the components in the electronic cavity, and provide a premise for the heat dissipation coupling of the electronic cavity and other cavities; at the same time, the second cabinet includes a DC distribution cavity, an AC distribution cavity and a filter reactor cavity, and at least one of the DC distribution cavity, the AC distribution cavity and the filter reactor cavity forms a circulating air duct with the electronic cavity, so that the heat dissipation of at least one of the DC distribution part, the AC distribution part and the reactor is coupled with the heat dissipation of the components in the electronic cavity. Compared with the prior art in which the first cabinet and the second cabinet dissipate heat separately (each modular component dissipates heat independently), the heat dissipation cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0041] FIG1 is a schematic structural diagram of a heat dissipation structure of an inverter provided in a first embodiment of the present application;

[0042] FIG2 is a side view of the structure shown in FIG1 ;

[0043] FIG3 is another schematic structural diagram of the heat dissipation structure of the inverter provided in Example 1 of the present application;

[0044] FIG4 is a side view of the structure shown in FIG3 ;

[0045] FIG5 is a schematic diagram of a gas flow in a heat dissipation cavity of a heat dissipation structure of an inverter provided in Example 1 of the present application;

[0046] FIG6 is a schematic diagram of another gas flow direction in the heat dissipation cavity of the heat dissipation structure of the inverter provided in Example 1 of the present application;

[0047] FIG7 is a schematic diagram of another gas flow direction in the heat dissipation cavity of the heat dissipation structure of the inverter provided in Example 1 of the present application;

[0048] FIG8 is a schematic diagram of another gas flow direction in the heat dissipation cavity of the heat dissipation structure of the inverter provided in Example 1 of the present application;

[0049] FIG9 is a schematic diagram of another gas flow direction in the heat dissipation cavity of the heat dissipation structure of the inverter provided in Example 1 of the present application;

[0050] FIG10 is a schematic diagram of another gas flow direction in the heat dissipation cavity of the heat dissipation structure of the inverter provided in Example 1 of the present application;

[0051] FIG11 is a schematic diagram of an air inlet of a heat dissipation cavity in a heat dissipation structure of an inverter provided in Example 1 of the present application;

[0052] FIG12 is another schematic diagram of gas flow in the circulating air duct in the structure shown in FIG1 ;

[0053] FIG13 is another schematic structural diagram of the heat dissipation structure of the inverter provided in Example 1 of the present application;

[0054] FIG14 is another schematic structural diagram of the heat dissipation structure of the inverter provided in Example 1 of the present application;

[0055] FIG15 is a schematic structural diagram of a heat dissipation structure of an inverter provided in Example 2 of the present application;

[0056] FIG16 is another schematic diagram of gas flow in the circulating air duct in the structure shown in FIG15 ;

[0057] FIG17 is another schematic structural diagram of the heat dissipation structure of the inverter provided in the second embodiment of the present application;

[0058] FIG18 is another schematic structural diagram of the heat dissipation structure of the inverter provided in the second embodiment of the present application;

[0059] FIG19 is a schematic structural diagram of the heat dissipation structure of the inverter provided in Example 3 of the present application.

[0060] Description of reference numerals:

[0061] 100 is the first cabinet, 200 is the second cabinet; 101 is the heat dissipation cavity, 102 is the electronic cavity; 201 is the DC distribution cavity, 202 is the AC distribution cavity, 203 is the filter reactor cavity; 1 is the first liquid-cooled heat exchanger, 2 is the first fan, 3 is the circulation pump, 4 is the storage box, 5 is the liquid-cooled radiator, 6 is the DC distribution part, 7 is the AC distribution part, 8 is the reactor, 9 is the connecting channel, 10 is the second liquid-cooled heat exchanger, 11 is the second fan, 12 is the third fan, 13 is the partition, 14 is the fourth fan, and 15 is the third liquid-cooled heat exchanger. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0063] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the embodiments of the present application, "one or more" refers to one, two or more; "and / or" describes the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0064] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0065] The "multiple" involved in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the words "first" and "second" are only used for the purpose of distinguishing the description and cannot be understood as indicating or implying relative importance or order.

[0066] The inverter mainly includes DC distribution part, inverter power module part, AC filter part, AC distribution part, and control circuit part.

[0067] In an inverter, the inverter power module and control circuitry can be considered part of the first modular assembly, while the DC power distribution, AC filtering, and AC power distribution components can be considered part of the second modular assembly. The first modular assembly is typically housed in a first cabinet, while the second modular assembly is housed in a second cabinet. The first and second cabinets are relatively independent.

[0068] It should be noted that the first modular assembly and the second modular assembly can both be used independently and interchangeably between different inverters, and can also be used outdoors when necessary. The inverter can also include other modular assemblies, not limited to the first and second modular assemblies described above.

[0069] The first cabinet and the second cabinet dissipate heat independently, that is, the first modular component and the second modular component dissipate heat independently, resulting in a high heat dissipation cost for the entire inverter.

[0070] In addition, the cavity where the reactor of the AC filter part is located is connected to the outside of the inverter, that is, the reactor is in direct contact with the air outside the inverter, resulting in a low protection level of the cavity where the reactor is located.

[0071] Based on the above problems, embodiments of the present application provide an inverter and a heat dissipation structure thereof to reduce the heat dissipation cost of the inverter.

[0072] Based on the functions, dimensions, heat generation characteristics, and inherent protection levels of each inverter component (DC power distribution, inverter power module, AC filter, AC power distribution, and control circuit), the inverter's heat dissipation structure is rationally designed and optimized. The following four examples specifically illustrate the heat dissipation structure of the inverter provided in the embodiments of this application.

[0073] Example 1

[0074] As shown in FIG1 and FIG2 , the heat dissipation structure of the inverter provided in the first embodiment includes: a first cabinet 100 , a second cabinet 200 , a liquid-cooling radiator, and a first liquid-cooling heat exchanger.

[0075] In this embodiment, the first cabinet 100 is located on top of the second cabinet 200. It is understood that the second cabinet 200 and the first cabinet 100 are arranged in sequence from bottom to top along the vertical direction. In actual practice, the first cabinet 100 and the second cabinet 200 can also be arranged in other ways, for example, the second cabinet 200 and the first cabinet 100 are arranged in sequence from top to bottom along the vertical direction, or the second cabinet 200 and the first cabinet 100 are arranged in sequence along a direction other than the vertical direction. This embodiment is not limited to this.

[0076] The first cabinet 100 includes a heat dissipation cavity 101 and an electronic cavity 102. The distribution of the heat dissipation cavity 101 and the electronic cavity 102 is selected according to actual conditions and is not limited in this embodiment.

[0077] The electronic chamber 102 is used to house components such as the inverter power module and the control circuit. It is understood that the inverter power module includes an inverter module. It should be noted that Figures 1 and 2 do not show the components within the electronic chamber 102. The control circuit can also be housed in the second cabinet 200 and is not limited to the electronic chamber 102.

[0078] The power modules in the inverter power module section generate a large amount of heat, and the heat is relatively concentrated. To meet the heat dissipation requirements of the power modules, a liquid-cooled radiator 5 dissipates heat from the power modules. It will be appreciated that the liquid-cooled radiator 5 contains a coolant that dissipates heat from the power modules. The coolant can be water or another liquid, and this embodiment is not limited thereto.

[0079] The power module is mounted on a liquid-cooled radiator 5. As the power module dissipates heat, the coolant in the radiator 5 heats up, requiring cooling. To this end, the coolant channels of the first liquid-cooled heat exchanger 1 and the coolant channels of the liquid-cooled radiator 5 are connected.

[0080] To achieve the recycling of the coolant, the coolant circulates between the first liquid-cooled heat exchanger 1 and the liquid-cooled radiator. Based on this, the heat dissipation structure of the inverter further includes a circulation pump 3 that drives the coolant to circulate between the first liquid-cooled heat exchanger 1 and the liquid-cooled radiator 5.

[0081] To facilitate coolant replenishment, the inverter's heat dissipation structure also includes a storage tank 4 for storing coolant. In this case, the circulating pump 3 is also used to connect the storage tank 4 and the first liquid-cooled heat exchanger 1. This means that the circulating pump 3 is also used to drive the coolant to flow between the storage tank 4 and the first liquid-cooled heat exchanger 1.

[0082] The heat dissipation cavity 101 is used to allow air to flow through to cool the first liquid-cooled heat exchanger 1. That is, the heat dissipation cavity 101 is used to allow air to flow through to cool the coolant in the first liquid-cooled heat exchanger 1. It is understood that the air entering the heat dissipation cavity 101 can be air outside the heat dissipation cavity 101, for example, air outside the entire inverter or air in other cavities in the inverter other than the heat dissipation cavity 101, as long as the cooling effect is achieved.

[0083] In FIG1 , the dotted arrow in the heat dissipation cavity 101 indicates the air flow direction in the heat dissipation cavity 101 . The direction indicated by the dotted arrow is only an approximate direction and is only schematic, and is not absolute.

[0084] The first liquid-cooled heat exchanger 1 is located in the heat dissipation cavity 101 , or the cavity where the first liquid-cooled heat exchanger 1 is located is connected to the heat dissipation cavity 101 .

[0085] The heat dissipation cavity 101 is disposed within the first cabinet 100. To improve the protection level of the electronic cavity 102, the heat dissipation cavity 101 and the electronic cavity 102 can be relatively isolated so that the protection levels of the heat dissipation cavity 101 and the electronic cavity 102 are different, and the protection level of the electronic cavity 102 is higher than that of the heat dissipation cavity 101. The heat dissipation cavity 101 can be referred to as a low-protection cavity, and the electronic cavity 102 can be referred to as a high-protection cavity.

[0086] In actual situations, the heat dissipation cavity 101 may be set outside the first cabinet 100, or inside the second cabinet 200, or outside the second cabinet 200, or in other cabinets of the inverter. This embodiment does not limit this.

[0087] The liquid-cooled radiator 5 is disposed in the first cabinet 100 , for example, in the electronic cavity 102 or the heat dissipation cavity 101 . To ensure that the air flowing through the heat dissipation cavity 101 cools the coolant in the first liquid-cooled heat exchanger 1 , the first liquid-cooled heat exchanger 1 of the liquid cooling system is disposed in the heat dissipation cavity 101 . Air flowing through the heat dissipation cavity 101 flows through the first liquid-cooled heat exchanger 1 to cool the coolant in the first liquid-cooled heat exchanger 1 , thereby cooling the coolant in the power module radiator, i.e., cooling the liquid-cooled radiator 5 ; this also improves the protective performance of the electronic cavity 102 .

[0088] Of course, the first liquid-cooled heat exchanger 1 can also be set in other locations, such as in the electronic cavity 102, and is not limited to the above embodiment. It is understandable that the first liquid-cooled heat exchanger 1 and the heat dissipation cavity 101 are located in the same cabinet (the first cabinet 100 or the second cabinet 200).

[0089] To improve the protection performance of the electronic cavity 102, the circulation pump 3 and the storage tank 4 are both disposed in the heat dissipation cavity 101. Of course, the circulation pump 3 and the storage tank 4 can also be disposed in other locations of the inverter, for example, both the circulation pump 3 and the storage tank 4 are disposed in the electronic cavity 102, and this embodiment is not limited to this.

[0090] To facilitate maintenance of the first liquid-cooled heat exchanger 1, the circulating pump 3, and the storage tank 4, the first liquid-cooled heat exchanger 1, the circulating pump 3, and the storage tank 4 can all be arranged on the top side of the heat dissipation cavity 101, that is, the first liquid-cooled heat exchanger 1, the circulating pump 3, and the storage tank 4 are all located on the top side of the first cabinet 100. Of course, the first liquid-cooled heat exchanger 1, the circulating pump 3, and the storage tank 4 can also be arranged at other locations in the first cabinet 100, and this embodiment is not limited to this.

[0091] In the above structure, the heat dissipation cavity 101 is used to dissipate heat for the first liquid-cooled heat exchanger 1, which can realize forced liquid cooling of the power module, effectively improve the heat dissipation efficiency, and facilitate the protection requirements of the components in the electronic cavity 102. It also provides a prerequisite for the heat dissipation coupling of the electronic cavity 102 and other cavities (DC distribution cavity 201, AC distribution cavity 202 and filter reactor cavity 203).

[0092] To facilitate air flow through the heat dissipation cavity 101, a first fan 2 is provided within the heat dissipation cavity 101. To facilitate air flow through the heat dissipation cavity 101 and through the first liquid-cooled heat exchanger 1, the first fan 2 can be positioned on the air inlet or outlet side of the first liquid-cooled heat exchanger 1. Of course, the first fan 2 can also be positioned elsewhere, and this is not limited to this in the first embodiment.

[0093] For easy maintenance, the first fan 2 can be located on the top side of the heat dissipation cavity 101, that is, the first fan 2 is located on the top side of the first cabinet 100. Of course, the first fan 2 can also be located at other positions, which is not limited in this embodiment.

[0094] As shown in Figures 3 and 4, when the first liquid-cooled heat exchanger 1, the circulation pump 3 and the storage box 4 are all located on the top side of the first cabinet 100, and the first fan 2 is located on the top side of the first cabinet 100, the first fan 2 can be selected to be located on the top of the first liquid-cooled heat exchanger 1. This makes it easier to maintain the first fan 2 and avoids damage to the first fan 2 due to leakage of the first liquid-cooled heat exchanger 1.

[0095] In this embodiment, the heat dissipation cavity 101 has an air inlet and an air outlet. There are many ways to distribute the air inlet and the air outlet, which are described in detail below.

[0096] On the one hand, as shown in Figure 1, the air inlet of the heat dissipation cavity 101 is located on the left side (which can be called the front side) of the first cabinet 100, and the air outlet of the heat dissipation cavity 101 is set on the top side of the first cabinet 100. In this case, the IP protection level requirement for the first fan 2 is higher.

[0097] On the other hand, as shown in Figure 3, at least one air inlet of the heat dissipation cavity 101 is located on the left side of the first cabinet 100, at least one air outlet of the heat dissipation cavity 101 is located on the top side of the first cabinet 100 and close to the right side, at least one air outlet of the heat dissipation cavity 101 is located on the right side of the first cabinet 100, and the air outlet of the heat dissipation cavity 101 is higher than the air inlet of the heat dissipation cavity 101.

[0098] In FIG3 , the positions of the air inlet and the air outlet of the heat dissipation cavity 101 can be interchanged, and the structure after the interchange is shown in FIG5 .

[0099] It should be noted that, when the air inlet or outlet of the heat dissipation cavity 101 is distributed on the top side of the first cabinet 100 , the IP protection level requirement for the first fan 2 is relatively high.

[0100] On the other hand, as shown in FIG6 , the air outlet of the heat dissipation cavity 101 is disposed only on the top side of the first cabinet 100. For example, the air outlet of the heat dissipation cavity 101 is located in the middle of the top side of the first cabinet 100. In this case, the air inlet of the heat dissipation cavity 101 is disposed on the front and / or rear side of the first cabinet 100.

[0101] It should be noted that the front and rear sides of the first cabinet 100 are opposite to each other, and cabinet doors are provided on both the front and rear sides of the first cabinet 100. The front and rear sides of the first cabinet 100 are respectively two sides of the first cabinet 100 in its transverse direction.

[0102] The positions of the air inlet and the air outlet of the heat dissipation cavity 101 in FIG6 can be interchanged, and the structure after the interchange is shown in FIG7 .

[0103] On the other hand, as shown in FIG8 , at least one air inlet of the heat dissipation cavity 101 is located on the front side of the first cabinet 100, and at least one air inlet of the heat dissipation cavity 101 is located on the rear side of the first cabinet 100. At least two air outlets of the heat dissipation cavity 101 are located on the top side of the first cabinet 100, with at least one air outlet located on the top side of the first cabinet 100 near the front, and at least one air outlet located on the top side of the first cabinet 100 near the rear. This increases the number of air inlets and outlets of the heat dissipation cavity 101, effectively improving the ventilation volume of the heat dissipation cavity 101 and facilitating improved heat dissipation effect and efficiency.

[0104] It should be noted that, in the above embodiment, the number of air inlets and air outlets of the heat dissipation cavity 101 can be adjusted according to actual conditions.

[0105] The positions of the air inlet and the air outlet of the heat dissipation cavity 101 in FIG8 can be interchanged, and the structure after the interchange is shown in FIG9 .

[0106] As shown in FIG10 , based on the structure shown in FIG8 , at least one air outlet is added, and the added air outlet is located at the rear side of the first cabinet 100 .

[0107] It should be noted that the positions of the air inlet and the air outlet of the heat dissipation cavity 101 in FIG10 can be interchanged.

[0108] The air inlet and outlet of the heat dissipation cavity 101 can also be set in other locations, not limited to the left, right, and top positions mentioned above. As shown in Figure 11, at least one air inlet of the heat dissipation cavity 101 is located on the first side of the first cabinet 100, and at least one air inlet of the heat dissipation cavity 101 is located on the second side of the first cabinet 100. It is understood that the first and second sides of the first cabinet 100 are located between the front and rear sides of the first cabinet 100. This effectively increases the air intake of the heat dissipation cavity 101, which is conducive to improving the heat dissipation effect and efficiency.

[0109] The air inlet shown in FIG. 11 may also be provided only on the first side or the second side of the first cabinet 100 , and is not limited to the air inlet arrangement shown in FIG. 11 .

[0110] Of course, at least one air outlet of the heat dissipation cavity 101 may also be located on the first side and / or the second side of the first cabinet 100. In this way, the air volume of the heat dissipation cavity 101 is effectively increased, which is conducive to improving the heat dissipation effect and heat dissipation efficiency.

[0111] It should be noted that the position of the second air outlet is the same as the position of the air inlet in FIG11 .

[0112] In actual situations, the air inlet of the heat dissipation cavity 101 may be only arranged on the first side and / or the second side of the first cabinet 100 , or the air outlet of the heat dissipation cavity 101 may be only arranged on the first side and / or the second side of the first cabinet 100 .

[0113] In some embodiments, to prevent the air inlet and air outlet of the heat dissipation cavity 101 from interfering with each other, the air inlet and air outlet of the heat dissipation cavity 101 can be located on different sides of the first cabinet 100. For example, the air inlet and air outlet of the heat dissipation cavity 101 can be located on opposite sides of the heat dissipation cavity 101. Of course, the air inlet and air outlet of the heat dissipation cavity 101 can also be located on the same side of the first cabinet 100, and the arrangement is not limited to the above.

[0114] The number of air inlets and air outlets of the heat dissipation cavity 101 is selected according to actual conditions, and this embodiment 1 does not limit this.

[0115] The second cabinet 200 includes a DC distribution cavity 201, an AC distribution cavity 202, and a filter reactor cavity 203. The DC distribution cavity 201 is used to accommodate the DC distribution part 6, the AC distribution cavity 202 is used to accommodate the AC distribution part 7, and the filter reactor cavity 203 is used to accommodate the reactor 8.

[0116] The DC distribution cavity 201 and the AC distribution cavity 202 are respectively located on both sides of the filter reactor cavity 203, that is, the filter reactor cavity 203 is located between the DC distribution cavity 201 and the AC distribution cavity 202. In this way, the copper busbar connection path of the entire inverter is shorter and the cost is more optimized.

[0117] It should be noted that the positions of the DC power distribution cavity 201 and the AC power distribution cavity 202 can be interchanged.

[0118] Of course, the DC distribution cavity 201 and the AC distribution cavity 202 can be located on the same side of the filter reactor cavity 203. For example, in Figure 1, the DC distribution cavity 201 and the AC distribution cavity 202 are both located on the left side of the filter reactor cavity 203. The DC distribution cavity 201 and the AC distribution cavity 202 can be distributed sequentially along the horizontal direction or along the vertical direction. The horizontal direction and the vertical direction are perpendicular, and both are perpendicular to the vertical direction. The vertical direction is the height direction of the second cabinet 200.

[0119] Since the protection level of the components (power module and control circuit part, etc.) in the DC distribution part 6, the AC distribution part 7 and the electronic cavity 102 is relatively low, it is possible to connect the top of the DC distribution cavity 201 to the electronic cavity 102, the top of the AC distribution cavity 202 to the electronic cavity 102, the top of the filter reactor cavity 203 to the electronic cavity 102, and the bottoms of any two of the DC distribution cavity 201, the filter reactor cavity 203 and the AC distribution cavity 202. In this way, the DC distribution cavity 201, the AC distribution cavity 202, the filter reactor cavity 203 and the electronic cavity 102 form a circulating air duct. The solid arrow in Figure 1 indicates the direction of air flow in the circulating air duct. The direction shown by the solid arrow is only an approximate direction and is only schematic, not absolute.

[0120] In order to improve the protection performance and heat dissipation effect, the above-mentioned circulation air duct can be selected as a closed air duct, which is not connected to the external environment. In actual practice, the circulation air duct can also be selected to be connected to the external environment, as long as the air in the circulation air duct is guaranteed to flow in the set direction.

[0121] In the above structure, the heat dissipation of the DC distribution part 6 is coupled with the heat dissipation of the components within the electronic cavity 102, the heat dissipation of the AC distribution part 7 is coupled with the heat dissipation of the components within the electronic cavity 102, and the heat dissipation of the reactor 8 is coupled with the heat dissipation of the components within the electronic cavity 102. Compared with the prior art in which the first cabinet and the second cabinet are heat-dissipated separately (each modular component is heat-dissipated independently), the heat dissipation cost is reduced. Moreover, the components within the electronic cavity 102, the DC distribution part 6, the AC distribution part 7, and the reactor 8 are all located in a closed circulating air duct. It can be understood that the DC distribution cavity 201, the AC distribution cavity 202, the filter reactor cavity 203, and the electronic cavity 102 are all high-protection cavities, ensuring the protection requirements of the components within the electronic cavity 102, the DC distribution part 6, the AC distribution part 7, and the reactor 8, thereby improving the protection reliability of the entire inverter. It should be noted that the heat dissipation cavity 101 can be called a low-protection cavity.

[0122] Moreover, in the above structure, the power module can be cooled by the air in the circulating air duct, and the power module can also be cooled by the air in the heat dissipation cavity 101, realizing dual heat dissipation of the power module and effectively improving the heat dissipation efficiency and heat dissipation effect of the power module.

[0123] As shown in Figure 1, to facilitate the formation of a circulating air duct between the DC distribution cavity 201, the AC distribution cavity 202, the filter reactor cavity 203, and the electronic cavity 102, the tops of the filter reactor cavity 203 and the AC distribution cavity 202 are each provided with an air outlet, and the top of the DC distribution cavity 201 is provided with an air inlet. The air outlets of the filter reactor cavity 203 and the AC distribution cavity 202 are both connected to the air inlet of the electronic cavity 102, and the air outlet of the electronic cavity 102 is connected to the air inlet of the DC distribution cavity 201. It will be understood that the air inlet and outlet of the electronic cavity 102 are both located at the bottom of the electronic cavity 102.

[0124] In order to ensure the formation of a circulating air duct, a partition 13 is provided in the electronic cavity 102, which separates the air inlet and the air outlet of the electronic cavity 102. In this way, short circuit of the air duct in the electronic cavity 102 is avoided, thereby ensuring the formation of a circulating air duct.

[0125] In the above structure, the bottom of the DC distribution cavity 201, the bottom of the filter reactor cavity 203, and the bottom of the AC distribution cavity 202 are sequentially connected through the connecting channel 9. It can be understood that the connecting channel 9 is located at the bottom end of the second cabinet 200, the connecting channel 9 is located in the filter reactor cavity 203, or the connecting channel 9 is located in the filter reactor cavity 203 and the AC distribution cavity 202; the connecting channel 9 is part of the circulating air duct.

[0126] In the above-mentioned circulating air duct, the air flowing out of the DC distribution cavity 201 is divided into two parts, one part enters the filter reactor cavity 203, and the other part enters the AC distribution cavity 202; the air flowing out of the filter reactor cavity 203 and the air flowing out of the AC distribution cavity 202 converge in the electronic cavity 102, and enter the DC distribution cavity 201 after flowing through the electronic cavity 102.

[0127] It should be noted that in the above-mentioned circulating air duct, the AC distribution cavity 202 and the filter reactor cavity 203 are arranged in parallel, and the DC distribution cavity 201, the AC distribution cavity 202, and the electronic cavity 102 are connected in series. This can be understood as follows: in the circulating air duct, the air duct of the AC distribution cavity 202 and the air duct of the filter reactor cavity 203 are arranged in parallel, and the air duct of the DC distribution cavity 201, the air duct of the AC distribution cavity 202, and the air duct of the electronic cavity 102 are connected in series. In actual situations, the air duct position of the AC distribution cavity 202 and the air duct position of the DC distribution cavity 201 can be swapped, that is, the air duct of the DC distribution cavity 201 and the air duct of the filter reactor cavity 203 are arranged in parallel, and the air duct of the DC distribution cavity 201, the air duct of the AC distribution cavity 202, and the air duct of the electronic cavity 102 are connected in series. In this way, the air flowing out of the AC distribution cavity 202 is divided into two parts, one part enters the filter reactor cavity 203, and the other part enters the DC distribution cavity 201; the air flowing out of the filter reactor cavity 203 and the air flowing out of the DC distribution cavity 201 converge in the electronic cavity 102, and enter the AC distribution cavity 202 after flowing through the electronic cavity 102.

[0128] Because the DC power distribution cavity 201, AC power distribution cavity 202, filter reactor cavity 203, and electronic cavity 102 form a circulating air duct, the air within the circulating air duct gradually heats up. To ensure the normal operation of the components within the circulating air duct, the air within the circulating air duct needs to be cooled. To this end, a second liquid-cooled heat exchanger 10 is installed within the first cabinet 100 to cool the air within the circulating air duct. The second liquid-cooled heat exchanger 10 is located between the components within the electronic cavity 102 and the reactor 8.

[0129] As shown in FIG1 , the second liquid-cooled heat exchanger 10 can be disposed at the air inlet of the electronic cavity 102. Thus, the air flowing out of the filter reactor cavity 203 and the AC power distribution cavity 202 is cooled by the second liquid-cooled heat exchanger 10 before flowing through the electronic cavity 102. This allows the cold air to preferentially dissipate heat from the components within the electronic cavity 102, improving the heat dissipation effect and efficiency of the components within the electronic cavity 102. This is particularly suitable for situations where the components within the electronic cavity 102 generate a large amount of heat or are resistant to low temperatures.

[0130] When the heat generated by the reactor 8 is high or the reactor 8 is resistant to low temperatures, cold air can be selected to preferentially dissipate heat from the reactor 8. Based on this, the air flow direction within the circulating air duct can be adjusted. As shown in Figure 12 , the air flow direction within the circulating air duct is selected to be completely opposite to the air flow direction shown in Figure 1 . In this way, the air flowing out of the electronic cavity 102 is cooled by the second liquid-cooled heat exchanger 10 and then flows through the filter reactor cavity 203 and the AC distribution cavity 202. This allows the cold air to preferentially dissipate heat from the reactor 8 and the AC distribution unit 7, improving the heat dissipation effect and efficiency of the reactor 8 and the AC distribution unit 7.

[0131] In this first embodiment, the second liquid-cooled heat exchanger 10 can also be installed in other locations. As shown in Figure 13, the second liquid-cooled heat exchanger 10 can also be installed in the second cabinet 200. That is, the second cabinet 200 is equipped with the second liquid-cooled heat exchanger 10, and the second liquid-cooled heat exchanger 10 is located in the AC power distribution cavity 202 and the filter reactor cavity 203. This can reduce the number of devices in the first cabinet 100, thereby reducing the weight of the first cabinet 100, facilitating the transportation of the first cabinet 100, and further facilitating the maintenance of the components in the first cabinet 100.

[0132] In the above structure, in order to facilitate the arrangement of the second liquid-cooled heat exchanger 10 , the second liquid-cooled heat exchanger 10 may be located on top of the reactor 8 and the AC power distribution part 7 .

[0133] As shown in Figure 14, both the first cabinet 100 and the second cabinet 200 are equipped with a second liquid-cooled heat exchanger 10. The second liquid-cooled heat exchanger 10 in the second cabinet 200 is located in the AC power distribution cavity 202 and the filter reactor cavity 203, and is located on top of the reactor 8 and the AC power distribution section 7. The second liquid-cooled heat exchanger 10 in the first cabinet 100 is located in the electronic cavity 102 and is located at the bottom of the components within the electronic cavity 102. This increases the heat exchange area and improves the heat dissipation efficiency and effect of the components within the circulating air duct. Based on this, this structure is particularly suitable for situations where the components within the electronic cavity 102 need to dissipate a large amount of heat.

[0134] In order to facilitate the flow of air in the circulating air duct and to facilitate the adjustment of the air flow direction in the circulating air duct, a fan is provided in the circulating air duct. The number and distribution of the fans are selected according to actual conditions. For example, a second fan 11, a third fan 12 and a fourth fan 14 are provided in the circulating air duct, wherein the second fan 11 is provided in the electronic cavity 102 and is located at the air outlet of the electronic cavity 102, and the second fan 11 is opposite to the air outlet of the AC distribution cavity 202; the third fan 12 is provided in the electronic cavity 102 and is located at the air outlet of the electronic cavity 102, and the third fan 12 is opposite to the air outlet of the filter reactor cavity 203; the fourth fan 14 is provided in the DC distribution cavity 201 and is located at the air outlet of the DC distribution cavity 201, and the fourth fan 14 is opposite to the air outlet of the electronic cavity 102; the second fan 11 and the third fan 12 are both located on the air inlet side or the air outlet side of the second liquid-cooled heat exchanger 10.

[0135] Since the first liquid-cooled heat exchanger 1 is provided in the heat dissipation cavity 101, and the air flowing through the heat dissipation cavity 101 cools the coolant in the first liquid-cooled heat exchanger 1, in order to reduce heat dissipation costs, the coolant channel of the first liquid-cooled heat exchanger 1 can be connected to the coolant channel of the second liquid-cooled heat exchanger 10. In this case, the circulating pump 3 is also used to drive the coolant to circulate between the first liquid-cooled heat exchanger 1 and the second liquid-cooled heat exchanger 10. The coolant channel of the second liquid-cooled heat exchanger 10 and the coolant channel of the liquid-cooled radiator 5 can be arranged in parallel or in series, depending on the actual situation, and this embodiment does not limit this.

[0136] In the above structure, the liquid-cooled radiator 5 and the second liquid-cooled heat exchanger 10 share the heat dissipation cavity 101 and the first liquid-cooled heat exchanger 1. If the inverter's heat dissipation structure includes a circulating pump 3 and a storage tank 4, the liquid-cooled radiator 5 and the second liquid-cooled heat exchanger 10 also share the circulating pump 3 and the storage tank 4. This allows all cavities in the entire inverter to be within the same liquid-cooled heat dissipation system, reducing the number of devices required to cool the coolant and effectively lowering heat dissipation costs. It also minimizes space usage, facilitating a reduction in the volume of the first cabinet 100 and the second cabinet 200. Compared to air cooling, it effectively improves heat dissipation effectiveness and efficiency.

[0137] Of course, another device may be selected to cool the coolant in the second liquid-cooled heat exchanger 10 and is not limited to the above embodiment.

[0138] In this embodiment, the liquid-cooled radiator 5, the first liquid-cooled heat exchanger 1, and the second liquid-cooled heat exchanger 10 are all gas-liquid heat exchangers, each having a coolant channel and an air channel for heat exchange. The coolant channel is for coolant to flow through, and the air channel is for air-cooled liquid to flow through.

[0139] In other embodiments, the gas-liquid heat exchanger may only have a coolant channel for the coolant to flow through, and the outer surface of the gas-liquid heat exchanger can exchange heat with the coolant channel, so that air flows directly through the outer surface of the gas-liquid heat exchanger, thereby cooling the coolant in the above-mentioned coolant channel.

[0140] In the first embodiment, there is at least one first liquid-cooled heat exchanger 1 and at least one second liquid-cooled heat exchanger 10. The number and distribution of the first liquid-cooled heat exchanger 1 and the second liquid-cooled heat exchanger 10 are selected according to actual conditions and are not limited in the first embodiment.

[0141] Example 2

[0142] The heat dissipation structure of the inverter provided in the second embodiment differs from that in the first embodiment mainly in that the circulating air duct is different and the position of the second liquid-cooled heat exchanger 10 is different.

[0143] As shown in Figure 15 , in this second embodiment, the air outlet of the filter reactor cavity 203 is connected to the air inlet of the electronic cavity 102. The air inlet of the DC distribution cavity 201 and the air inlet of the AC distribution cavity 202 are both connected to the air outlet of the electronic cavity 102. The air outlet of the DC distribution cavity 201 and the air outlet of the AC distribution cavity 202 are both connected to the air inlet of the filter reactor cavity 203 via a connecting channel 9. A partition 13 is provided in the electronic cavity to separate the air inlet and outlet of the electronic cavity 102 to ensure the formation of a circulating air duct.

[0144] It should be noted that in the circulating air duct, the DC distribution cavity 201, the AC distribution cavity 202, and the electronic cavity 102 are all connected in series with the filter reactor cavity 203, while the DC distribution cavity 201 and the AC distribution cavity 202 are connected in parallel. This can be understood as follows: in the circulating air duct, the air ducts of the DC distribution cavity 201, the air ducts of the AC distribution cavity 202, and the air ducts of the electronic cavity 102 are all connected in series with the air duct of the filter reactor cavity 203, while the air ducts of the DC distribution cavity 201 and the air ducts of the AC distribution cavity 202 are connected in parallel.

[0145] In the second embodiment, the second liquid-cooled heat exchanger 10 is provided in the first cabinet 100 , and the second liquid-cooled heat exchanger 10 is located between the components in the electronic cavity 102 and the reactor 8 .

[0146] In the above structure, the second liquid-cooled heat exchanger 10 is located at the air inlet of the electronic cavity 102 and at the bottom of the components within the electronic cavity 102. Thus, the air flowing out of the filter reactor cavity 203 is cooled by the second liquid-cooled heat exchanger 10 and then enters the electronic cavity 102. There, it is divided into two parts: one part enters the DC distribution cavity 201, and the other part enters the AC distribution cavity 202. The air flowing out of the DC distribution cavity 201 and the air flowing out of the AC distribution cavity 202 both enter the connecting channel 9 and merge, and then enter the filter reactor cavity 203 through the connecting channel 9. In this way, the air cooled by the second liquid-cooled heat exchanger 10 first cools the components within the electronic cavity 102, which is particularly suitable for situations where the components within the electronic cavity 102 generate a large amount of heat or are resistant to low temperatures.

[0147] When the heat generated by the reactor 8 is high or the reactor 8 is resistant to low temperatures, cold air can be selected to preferentially dissipate heat from the reactor 8. Based on this, the air flow direction within the circulating air duct can be adjusted. As shown in Figure 16 , the air flow direction within the circulating air duct is selected to be completely opposite to the air flow direction shown in Figure 15 . In this way, the air flowing out of the electronic cavity 102 is cooled by the second liquid-cooled heat exchanger 10 and then flows through the filter reactor cavity 203. This allows the cold air to preferentially dissipate heat from the reactor 8, improving the heat dissipation effect and efficiency of the reactor 8.

[0148] In the second embodiment, the second liquid-cooled heat exchanger 10 can also be installed in other locations. As shown in Figure 17, the second liquid-cooled heat exchanger 10 is installed in the second cabinet 200 and is located in the filter reactor cavity 203. This can reduce the number of devices in the first cabinet 100, thereby reducing the weight of the first cabinet 100, facilitating the transportation of the first cabinet 100, and further facilitating the maintenance of the components in the first cabinet 100.

[0149] In the above structure, in order to facilitate the arrangement of the second liquid-cooled heat exchanger 10 , the second liquid-cooled heat exchanger 10 may be located on the top of the reactor 8 .

[0150] As shown in Figure 18, both the first cabinet 100 and the second cabinet 200 are equipped with a second liquid-cooled heat exchanger 10. The second liquid-cooled heat exchanger 10 in the second cabinet 200 is located in the filter reactor cavity 203 and on top of the reactor 8. The second liquid-cooled heat exchanger 10 in the first cabinet 100 is located in the electronic cavity 102 and at the bottom of the components within the electronic cavity 102. This increases the heat exchange area and improves the heat dissipation efficiency and effect of the components within the circulating air duct. Based on this, this structure is particularly suitable for situations where the components within the electronic cavity 102 need to dissipate a large amount of heat.

[0151] In order to facilitate the flow of air in the circulating air duct and to facilitate the adjustment of the air flow direction in the circulating air duct, a fan is provided in the circulating air duct. The number and distribution of the fans are selected according to actual conditions. For example, a second fan 11, a third fan 12 and a fourth fan 14 are provided in the circulating air duct, wherein the second fan 11 is provided in the AC distribution cavity 202 and is located at the air outlet of the AC distribution cavity 202, and the second fan 11 is opposite to the air outlet of the electronic cavity 102; the third fan 12 is provided in the electronic cavity 102 and is located at the air outlet of the electronic cavity 102, and the third fan 12 is opposite to the air outlet of the filter reactor cavity 203; the fourth fan 14 is provided in the DC distribution cavity 201 and is located at the air outlet of the DC distribution cavity 201, and the fourth fan 14 is opposite to the air outlet of the electronic cavity 102; the third fan 12 is located on the air inlet side or the air outlet side of the second liquid-cooled heat exchanger 10.

[0152] For other structures of the heat dissipation structure of the inverter in the second embodiment, reference may be made to the first embodiment, and no further details will be given here.

[0153] Example 3

[0154] The heat dissipation structure of the inverter provided in the third embodiment differs from that in the first embodiment mainly in the different circulating air ducts.

[0155] Since the reactor 8 generates a lot of heat, if the reactor 8 is placed in the circulating air duct together with capacitors, AC / DC switches and other devices, the heat generated by the reactor 8 may affect the temperature rise of capacitors, AC / DC switches and other devices. The highest temperature resistance value that the reactor 8 can withstand is much greater than that of capacitors, AC / DC switches and other devices. Therefore, it is necessary to dissipate heat from the reactor 8 separately. Based on this, as shown in Figure 19, the filter reactor cavity 203 and the electronic cavity 102 are not connected, that is, the filter reactor cavity 203 and the circulating air duct are not connected. For example, the DC distribution cavity 201, the AC distribution cavity 202 and the electronic cavity 102 are not connected to the filter reactor cavity 203. Based on this, the filter reactor cavity 203 can be selected as a closed cavity.

[0156] In the third embodiment, a third liquid-cooled heat exchanger 15 is provided in the filter reactor cavity 203 . The specific structure of the third liquid-cooled heat exchanger 15 may refer to the structure of the gas-liquid heat exchanger in the first embodiment.

[0157] The air flow within the filter reactor cavity 203 is turbulent, and the coolant within the third liquid-cooled heat exchanger 15 cools the air flowing through the third liquid-cooled heat exchanger 15, thereby dissipating heat from the reactor 8. The thick solid arrows in Figure 19 indicate the direction of the air flow turbulence within the filter reactor cavity 203. The directions indicated by the thick solid arrows are only approximate and schematic, and are not absolute.

[0158] The specific position of the third liquid-cooled heat exchanger 15 in the filter reactor cavity 203 is selected according to actual conditions and is not limited in this embodiment.

[0159] In order to facilitate the turbulence of the air in the filter reactor cavity 203, the filter reactor cavity 203 is provided with a third fan 12. The number and position of the third fans 12 are selected according to actual conditions and are not limited in this embodiment.

[0160] In the third embodiment, since the filter reactor cavity 203 is not connected to the circulating air duct, the reactor 8 is prevented from affecting the heat dissipation of the components in the circulating air duct; moreover, the heat dissipation of the reactor 8 is performed separately, which is beneficial to improving the heat dissipation effect and heat dissipation efficiency of the reactor 8.

[0161] In the third embodiment, since the filter reactor cavity 203 is not connected to the circulating air duct, the DC distribution cavity 201, the AC distribution cavity 202 and the electronic cavity 102 form a circulating air duct. As shown in Figure 19, the DC distribution cavity 201, the AC distribution cavity 202 and the electronic cavity 102 are connected end to end in sequence to form a circulating air duct. Among them, the top of the DC distribution cavity 201 and the top of the AC distribution cavity 202 are both connected to the bottom of the electronic cavity 102, and the bottom of the DC distribution cavity 201 and the bottom of the AC distribution cavity 202 are connected through a connecting channel 9. It can be understood that the connecting channel 9 is provided in the filter reactor cavity 203, that is, the connecting channel 9 is provided in the second cabinet 200.

[0162] The thin solid arrows in FIG19 indicate the direction of air flow in the circulating air duct. The direction indicated by the thin solid arrows is only an approximate direction and is only schematic, and is not absolute.

[0163] A copper busbar can be installed in the AC power distribution cavity 202 to connect to the low-voltage side of the transformer. To facilitate installation and heat dissipation, the busbar is located at the bottom of the AC power distribution cavity 202. This allows air flowing out of the connection channel 9 to flow through the busbar, dissipating heat.

[0164] The number and position of the second liquid-cooled heat exchangers 10 in the circulating air duct, as well as the number and position of the fans in the circulating air duct, can be designed with reference to the foregoing and in combination with actual conditions, and this embodiment does not limit this.

[0165] The second liquid-cooled heat exchanger 10 and / or the third liquid-cooled heat exchanger 15 can share the heat dissipation cavity 101 with the first liquid-cooled heat exchanger 1. This means that the coolant channel of the second liquid-cooled heat exchanger 10 is connected to the coolant channel of the first liquid-cooled heat exchanger 1, and / or the coolant channel of the third liquid-cooled heat exchanger 15 is connected to the coolant channel of the first liquid-cooled heat exchanger 1. That is, the coolant in the second liquid-cooled heat exchanger 10 and / or the third liquid-cooled heat exchanger 15 is cooled by the heat dissipation cavity 101 and the first liquid-cooled heat exchanger 1. This reduces the number of components, lowers the cost of the inverter, and helps reduce the size of the inverter, especially when the second liquid-cooled heat exchanger 10 and the third liquid-cooled heat exchanger 15 share the heat dissipation cavity 101 with the first liquid-cooled heat exchanger 1.

[0166] The cooling liquid channel for the coolant to flow through in the second liquid-cooled heat exchanger 10 and the cooling liquid channel for the coolant to flow through in the third liquid-cooled heat exchanger 15 can be arranged in parallel or in series, depending on the actual situation, and this embodiment does not limit this.

[0167] Of course, the second liquid-cooled heat exchanger 10 and the third liquid-cooled heat exchanger 15 may also be provided with matching devices to cool the above-mentioned coolant, and are not limited to the above-mentioned embodiment.

[0168] For other structures of the heat dissipation structure of the inverter in the third embodiment, reference may be made to the first embodiment, and will not be repeated here.

[0169] Example 4

[0170] The heat dissipation structure of the inverter provided in the fourth embodiment differs from that in the third embodiment mainly in the different circulating air ducts.

[0171] In the fourth embodiment, one of the DC distribution cavity 201 and the AC distribution cavity 202 forms a circulating air duct with the electronic cavity 102, while the other is not connected to the electronic cavity 102. It is understandable that the one of the DC distribution cavity 201 and the AC distribution cavity 202 that is not connected to the electronic cavity 102 is also not connected to the circulating air duct.

[0172] In the DC distribution cavity 201 and the AC distribution cavity 202, the one that is not connected to the electronic cavity 102 is provided with a fourth liquid-cooled heat exchanger and a fan. The air in the one that is not connected to the electronic cavity 102 is turbulent through the fan, and the fourth liquid-cooled heat exchanger cools the air in the one that is not connected to the electronic cavity 102, thereby cooling the devices in the one that is not connected to the electronic cavity 102.

[0173] The specific structure of the fourth liquid-cooled heat exchanger can refer to the structure of the gas-liquid heat exchanger in Example 1. The cooling of the coolant in the fourth liquid-cooled heat exchanger can refer to the third liquid-cooled heat exchanger, and will not be repeated in this fourth embodiment.

[0174] When the cooling liquid channel of the third liquid-cooled heat exchanger 15 is connected to the cooling liquid channel of the first liquid-cooled heat exchanger 1, and the cooling liquid channel of the fourth liquid-cooled heat exchanger is connected to the cooling liquid channel of the first liquid-cooled heat exchanger 1, the cooling liquid channel of the third liquid-cooled heat exchanger 15 and the cooling liquid channel of the fourth liquid-cooled heat exchanger can be connected in parallel or in series.

[0175] For other structures of the heat dissipation structure of the inverter in the fourth embodiment, reference may be made to the foregoing text and will not be repeated here.

[0176] Based on the heat dissipation structure of the inverter provided in the above embodiment, an embodiment of the present application further provides an inverter, which includes the heat dissipation structure of the inverter provided in the above embodiment.

[0177] Since the heat dissipation structure of the inverter provided in the above embodiment has the above technical effects, the above inverter includes the heat dissipation structure of the inverter provided in the above embodiment, and the above inverter also has the corresponding technical effects, which will not be described in detail herein.

[0178] In some embodiments, the inverter includes at least one inverter unit.

[0179] In the case where the inverter includes one inverter unit:

[0180] On the one hand, the inverter unit may include the heat dissipation structure of the inverter provided in the above embodiment.

[0181] Alternatively, the inverter unit may include the first cabinet 100, the second cabinet 200, and the liquid-cooled radiator 5, but not the first liquid-cooled heat exchanger 1 and the heat dissipation cavity 101. In this case, the first liquid-cooled heat exchanger 1 and the heat dissipation cavity 101 are provided as independent units. This simplifies the structure of the inverter unit, reducing its size and cost; it also simplifies the structure of the entire inverter, reducing its size and cost.

[0182] In the case where the inverter includes at least two inverter units:

[0183] On the one hand, the heat dissipation structure of the inverter provided in the above embodiment can be selected for each inverter unit.

[0184] Alternatively, each inverter unit can include: a first cabinet 100, a second cabinet 200, and a liquid-cooled radiator 5, with at least two inverter units sharing the first liquid-cooled heat exchanger 1 and the heat dissipation cavity 101. It is understood that the inverter unit does not include the first liquid-cooled heat exchanger 1 and the heat dissipation cavity 101. This simplifies the structure of the inverter unit, reducing its size and cost; it also simplifies the structure of the entire inverter, reducing its size and cost.

[0185] It should be noted that when a second liquid-cooled heat exchanger 10 is provided in the circulating air duct, the inverter unit also includes the second liquid-cooled heat exchanger 10. When a third liquid-cooled heat exchanger 15 is provided in the filter reactor cavity 203, the inverter unit also includes the third liquid-cooled heat exchanger 15. When a fourth liquid-cooled heat exchanger is provided in either the DC power distribution cavity 201 or the AC power distribution cavity 202 that is not connected to the electronic cavity 102, the inverter unit also includes the fourth liquid-cooled heat exchanger.

[0186] The type of the above-mentioned inverter is selected according to actual conditions. For example, the inverter is a photovoltaic grid-connected inverter, which is not limited in the embodiments of the present application.

[0187] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat dissipation structure of an inverter, characterized in that: include: A first cabinet, a second cabinet, a liquid-cooled radiator, and a first liquid-cooled heat exchanger; Wherein, the first cabinet includes an electronic cavity, and the electronic cavity is used to set the inverter power module part; The liquid cooling radiator is used to dissipate heat for the power module of the inverter power module part, and the cooling liquid channel of the liquid cooling radiator is connected with the cooling liquid channel of the first liquid cooling heat exchanger; The heat dissipation structure of the inverter is provided with a heat dissipation cavity, and the heat dissipation cavity is used for air to flow through to cool the coolant in the first liquid-cooled heat exchanger; The second cabinet includes a DC distribution cavity, an AC distribution cavity and a filter reactor cavity. The DC distribution cavity is used to set up a DC distribution part, the AC distribution cavity is used to set up an AC distribution part, and the filter reactor cavity is used to set up a reactor. At least one of the DC distribution cavity, the AC distribution cavity and the filter reactor cavity forms a circulating air duct with the electronic cavity.

2. The heat dissipation structure of the inverter according to claim 1, characterized in that: A second liquid-cooled heat exchanger for cooling air is arranged in the circulating air duct.

3. The heat dissipation structure of the inverter according to claim 2, characterized in that: The coolant channel of the second liquid-cooled heat exchanger is in communication with the coolant channel of the first liquid-cooled heat exchanger.

4. The heat dissipation structure of the inverter according to claim 2, characterized in that: The DC power distribution cavity, the AC power distribution cavity, the filter reactance cavity and the electronic cavity form the circulation air duct; Wherein, in the circulating air duct, the DC distribution cavity, the AC distribution cavity and the electronic cavity are connected in series, and one of the DC distribution cavity and the AC distribution cavity is connected in parallel with the filter reactance cavity.

5. The heat dissipation structure of the inverter according to claim 4, characterized in that: The second liquid-cooled heat exchanger is located in the electronic cavity; and / or the second liquid-cooled heat exchanger is located in the filter reactor cavity, and in one of the DC distribution cavity and the AC distribution cavity connected in parallel with the filter reactor cavity.

6. The heat dissipation structure of the inverter according to claim 2, characterized in that: The DC power distribution cavity, the AC power distribution cavity, the filter reactance cavity and the electronic cavity form the circulation air duct; Wherein, in the circulating air duct, the DC distribution cavity, the AC distribution cavity and the electronic cavity are all connected in series with the filter reactance cavity, and the DC distribution cavity and the AC distribution cavity are connected in parallel.

7. The heat dissipation structure of the inverter according to claim 6, characterized in that: The second liquid-cooled heat exchanger is located in the electronic cavity, and / or the second liquid-cooled heat exchanger is located in the filter reactor cavity.

8. The heat dissipation structure of the inverter according to any one of claims 2 to 7, characterized in that: The second liquid-cooled heat exchanger is located between the device in the electronic cavity and the reactor; And / or, the first liquid-cooled heat exchanger and the second liquid-cooled heat exchanger are both arranged in the first cabinet; And / or, the first liquid-cooled heat exchanger and the second liquid-cooled heat exchanger are both arranged in the second cabinet.

9. The heat dissipation structure of the inverter according to claim 1, characterized in that: The DC power distribution cavity, the AC power distribution cavity and the electronic cavity form the circulating air duct; The filter reactor cavity is not connected to the electronic cavity, and a third liquid-cooled heat exchanger is arranged in the filter reactor cavity, and the third liquid-cooled heat exchanger is used to cool the air in the filter reactor cavity.

10. The heat dissipation structure of the inverter according to claim 9, characterized in that: The coolant channel of the third liquid-cooled heat exchanger is in communication with the coolant channel of the first liquid-cooled heat exchanger.

11. The heat dissipation structure of the inverter according to claim 1, characterized in that: One of the DC power distribution cavity and the AC power distribution cavity forms the circulating air duct with the electronic cavity, the other is not connected with the electronic cavity, and the filter reactance cavity is not connected with the electronic cavity; A third liquid-cooled heat exchanger is provided in the filter reactor cavity, and the third liquid-cooled heat exchanger is used to cool the air in the filter reactor cavity; The one of the DC power distribution cavity and the AC power distribution cavity that is not connected to the electronic cavity is provided with a fourth liquid-cooled heat exchanger for cooling the air inside the cavity.

12. The heat dissipation structure of the inverter according to claim 11, characterized in that: The cooling liquid channel of the third liquid-cooled heat exchanger is in communication with the cooling liquid channel of the first liquid-cooled heat exchanger, and the cooling liquid channel of the fourth liquid-cooled heat exchanger is in communication with the cooling liquid channel of the first liquid-cooled heat exchanger.

13. The heat dissipation structure of the inverter according to any one of claims 1 to 12, characterized in that: The first cabinet and the second cabinet are distributed in sequence along the vertical direction; And / or, the DC power distribution cavity and the AC power distribution cavity are respectively located on two opposite sides of the filter reactance cavity; And / or, the heat dissipation cavity is arranged in the first cabinet; And / or, the electronic cavity is also used to set a control circuit part.

14. An inverter, characterized in that: The invention comprises a heat dissipation structure of an inverter as claimed in any one of claims 1 to 13.

15. The inverter according to claim 14, characterized in that: comprising at least two inverter units; Wherein, each of the inverter units includes the heat dissipation structure of the inverter according to any one of claims 1 to 13; or, each of the inverter units includes: the first cabinet, the second cabinet and the liquid-cooled radiator, and at least two of the inverter units share the first liquid-cooled heat exchanger and the heat dissipation cavity.

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