A power cabinet with balanced heat dissipation

Abstract

The application discloses a power cabinet with balanced heat dissipation, which comprises a cabinet body and a protection assembly. The cabinet body is provided with a first side wall and a second side wall parallel to each other and opposite to each other along the X-axis direction. A protection cavity is arranged between the first side wall and the second side wall. The top of the protection cavity is provided with a cold air outlet and a hot air return air outlet along the X-axis direction. The hot air return air outlet is close to the second side wall. The protection cavity close to the first side wall is provided with a partition plate extending along the vertical direction. The partition plate separates the protection cavity along the X-axis direction into a wind passing cavity close to the first side wall and used only for passing wind and a containing cavity close to the second side wall. The wind passing cavity and the containing cavity are respectively communicated with the cold air outlet and the hot air return air outlet. A plurality of wind passing openings are arranged on the partition plate along the vertical direction, and at least part of the wind passing openings are located at the bottom of the partition plate. The protection assembly is arranged in the containing cavity and is suitable for circulating air flow from the wind passing opening to the hot air return air outlet for heat dissipation. The application can balance the heat dissipation of the protection assembly and does not need to separately arrange a turbulence fan.

Description

TECHNICAL FIELD

[0001] The present application relates to the electrical technical field, in particular to a power cabinet with balanced heat dissipation. BACKGROUND

[0002] The power cabinet such as photovoltaic inverter, energy storage converter cabinet, etc. usually includes IGBT power module, capacitor module, and the IGBT power module and capacitor module have high heat dissipation and protection requirements, among which the heat generation of IGBT is relatively large. In the prior art, a relatively independent and sealed protection cavity is usually arranged to accommodate the high-protection components such as IGBT power module and capacitor module, and a liquid cooling unit and an air-cooled heat exchanger are used to dissipate heat of the high-protection components. In addition to the IGBT power module and the capacitor module, other electrical components are also arranged in the protection cavity. These electrical components are usually cooled by the air flow of the air-cooled heat exchanger. However, due to the layout in the protection cavity, some electrical components are often in the air flow blind area, resulting in high temperature. In the prior art, a spoiler fan is usually placed in the protection cavity to avoid the air flow blind area. However, the spoiler fan is not convenient to maintain and occupies the space in the protection cavity. SUMMARY

[0003] The present application aims to overcome the above-mentioned defects or problems in the background art, and provide a power cabinet with balanced heat dissipation, which balances the heat dissipation of the protection components and does not need to separately arrange a spoiler fan.

[0004] To achieve the above-mentioned purpose, the present application and its related embodiments adopt the following technical solutions, but are not limited to the following solutions:

[0005] The first technical solution and its related embodiments relate to a power cabinet with balanced heat dissipation, which includes a cabinet body, a first side wall and a second side wall parallel to each other and opposite to each other are arranged along the X-axis direction of the cabinet body, a protection cavity is arranged between the first side wall and the second side wall, a cold air outlet and a hot air return are arranged at the top of the protection cavity along the X-axis direction, the hot air return is close to the second side wall, a partition plate extending in the vertical direction is arranged close to the first side wall of the protection cavity, the partition plate separates the protection cavity into a wind passing cavity close to the first side wall and used only for air passing and a containing cavity close to the second side wall along the X-axis direction, the wind passing cavity and the containing cavity are respectively communicated with the cold air outlet and the hot air return; a plurality of wind passing openings are arranged on the partition plate in the vertical direction, and at least part of the wind passing openings are located at the bottom of the partition plate; and a protection component is arranged in the containing cavity and is adapted to be cooled by the circulating air flow from the wind passing opening to the hot air return.

[0006] The second technical solution is based on the first technical solution, and is a preferred embodiment of the first technical solution, wherein the air guide member is further included; the hot air return air outlet and the cold air outlet are both above the accommodating cavity; the air guide member extends along the X-axis direction, the upper end of the air guide member is communicated with the cold air outlet, the end of the air guide member close to the hot air return air outlet is provided with a first air outlet for downward air outlet to deliver cold air to the accommodating cavity, and the end of the air guide member away from the hot air return air outlet is provided with a second air outlet for air outlet to the air passing cavity; and the protection assembly is further adapted to dissipate heat by circulating air flow from the first air outlet to the hot air return air outlet.

[0007] The third technical solution is based on the second technical solution, and is a preferred embodiment of the second technical solution, wherein the air guide member is provided with a first centrifugal fan, the first centrifugal fan is adapted to drive the air flow of the hot air return air outlet to the cold air outlet, and the air volume of the second air outlet is greater than that of the first air outlet.

[0008] The fourth technical solution is based on the second technical solution, and is a preferred embodiment of the third technical solution, wherein the protection assembly is provided with a first electrical component and a second electrical component spaced apart along the X-axis direction close to the first air outlet, and an air passing channel corresponding to the first air outlet is formed between the first electrical component and the second electrical component.

[0009] The fifth technical solution is based on the fourth technical solution, and is a preferred embodiment of the fourth technical solution, wherein a second centrifugal fan is further included; the cabinet body is further provided with a cover body, the second centrifugal fan is arranged in the cover body, the cover body is arranged at the bottom of the accommodating cavity and forms an independent heat dissipation air channel, the cover body is provided with an air guide surface inclined relative to the vertical direction and the X-axis direction corresponding to the air passing channel to make the air flow of the air passing channel adapted to flow downwardly; and the protection assembly includes an electric reactor arranged in the heat dissipation air channel.

[0010] The sixth technical solution is based on the fifth technical solution, and is a preferred embodiment of the fifth technical solution, wherein the cover body includes a vertical section and two horizontal sections extending along the X-axis direction, and the two horizontal sections are respectively located at the two ends of the vertical section in the Y-axis direction; the electric reactor is arranged in the vertical section, the second centrifugal fan is arranged in the horizontal section and is adapted to guide the air flow of the vertical section to the X-axis direction; and the projection of the vertical section and the air passing outlet located at the bottom along the X-axis direction are staggered along the Y-axis direction.

[0011] The seventh technical solution is based on the sixth technical solution, and is a preferred embodiment of the sixth technical solution, wherein the first electrical component is close to the partition plate, the protection assembly further includes a third electrical component, the third electrical component is close to the partition plate and located below the first electrical component, and the air passing outlet is at least partially located between the first electrical component and the third electrical component.

[0012] The eighth technical solution is based on the seventh technical solution, and is a preferred embodiment of the seventh technical solution. The protection assembly further comprises a fourth electrical component, which is arranged at the bottom of the accommodating cavity close to the second side wall. The vertical section of the cover body is provided with two air guide surfaces gradually away from each other from top to bottom along the X-axis direction. The third electrical component is located downstream of the air flow guided by one of the air guide surfaces, and the fourth electrical component is also located downstream of the air flow guided by the other air guide surface. The second electrical component is a capacitor module. The capacitor module comprises an electrical plate member in a plate-shaped structure and adapted to carry a plurality of electrical units. The electrical plate member extends along the vertical direction and forms the air passage with the first electrical component. The first electrical component is a direct-current electrical component. The third electrical component is a fuse. The fourth electrical component is an alternating-current electrical component.

[0013] The ninth technical solution is based on the eighth technical solution, and is a preferred embodiment of the eighth technical solution. The cabinet body is provided with a first movable door at the first end along the X-axis direction. The first movable door forms the first side wall when fixed. The partition plate is close to the first end.

[0014] The tenth technical solution is based on the ninth technical solution, and is a preferred embodiment of the ninth technical solution. The heat exchange device and the air-cooled heat exchanger are further included. The heat exchange device comprises a liquid cooling unit and a radiator in communication with the cooling flow channel of the liquid cooling unit. The protection assembly further comprises a fifth electrical component and a sixth electrical component. The fifth electrical component is arranged at the bottom of the accommodating cavity close to the hot air return air outlet. The sixth electrical component is arranged at the bottom of the accommodating cavity close to the air passage. The radiator is arranged in the accommodating cavity and used for dissipating heat for the fifth electrical component. The cabinet body is further provided with a first ventilation cavity and a second ventilation cavity. The liquid cooling unit is arranged in the first ventilation cavity and used for delivering cold liquid to the radiator and recovering hot liquid from the radiator. The air-cooled heat exchanger is arranged in the second ventilation cavity and in communication with the hot air return air outlet and the cold air outlet, so as to cool the hot air of the hot air return air outlet into the cold air of the cold air outlet.

[0015] From the above description of the present application and its specific embodiments, compared with the prior art, the technical solution of the present application and its related embodiments have the following beneficial effects due to the use of the following technical means:

[0016] In the first technical solution and related embodiments, the over-wind cavity is only used for over-wind, that is, the over-wind cavity is not used for placing the protection assembly, so in actual operation, the length of the over-wind cavity along the X-axis direction can be reduced as much as possible and the length of the containing cavity along the X-axis direction can be increased, which is conducive to increasing the wind pressure and flow rate of the wind flow in the over-wind cavity, facilitating the outflow of the over-wind port and the rapid flow of the wind flow in the containing cavity, thereby creating conditions for improving the heat dissipation efficiency of the protection assembly and increasing the space of the containing cavity; the arrangement of the over-wind cavity and the over-wind port enables the cold air of the cold air outlet port to flow into the containing cavity with relatively low pressure through the over-wind port after flowing into the over-wind cavity, and in actual application, the over-wind port can be opened on the partition plate for places in the containing cavity that are not easy to over-wind, thereby avoiding the formation of a wind flow blind area in the containing cavity; in the technical solution, at least part of the over-wind port is located at the bottom of the partition plate, and since the hot air return port is close to the second side wall, the cold air flowing out of the over-wind port can flow through the bottom of the containing cavity and then flow upward, thereby avoiding the formation of a wind flow blind area at the bottom of the containing cavity and avoiding the formation of a wind flow blind area on one side of the second side wall; since the over-wind ports on the partition plate are arranged in the vertical direction, multiple layers of cold air flow can be formed in the vertical direction, and the multiple layers of cold air flow can simultaneously carry away the heat of the protection assembly during the flow to the hot air return port, thereby improving the heat dissipation efficiency of the protection assembly and enabling the turbulence fan to be distributed throughout the containing cavity without the need for maintenance.

[0017] In the second technical solution and related embodiments, the arrangement of the air guide member enables the distance between the cold air outlet port and the hot air return port to be relatively short, which is conducive to the arrangement of the air-cooled heat exchanger in the tenth technical solution, of course, in addition to the air-cooled heat exchanger, other heat exchange methods such as liquid cooling units or air conditioners can also be used, but the cost of the air-cooled heat exchanger is relatively low. The hot air return port and the cold air outlet port are both above the containing cavity, the air flow of the cold air outlet port is guided by the air guide member into the over-wind cavity in a direction away from the hot air return port, the length of the over-wind cavity along the X-axis direction can be reduced as much as possible, thereby enabling the air flow to accelerate and pressurize in the over-wind cavity when flowing into the over-wind cavity from the second air outlet port, and then accelerating again when flowing out through the over-wind port, thereby quickly carrying away the heat of the protection assembly; the protection assembly is also suitable for heat dissipation by the circulating air flow from the first air outlet port to the hot air return port, thereby forming multiple clusters of cold air flow in different directions in the containing cavity, further avoiding wind flow blind areas and improving the heat dissipation efficiency; in actual application, the part of the protection assembly that generates relatively low heat can be placed at the first air outlet port to ensure balanced heat dissipation of the protection assembly.

[0018] In the third technical solution and the related embodiments, the first centrifugal fan is arranged in the air guide member, the centrifugal fan has a smaller footprint than the axial fan, and the reversing of the air flow can be realized, the air volume of the second air outlet is greater than that of the first air outlet, and most of the cold air is ensured to flow into the air passing cavity, so that the balanced heat dissipation of the protection assembly is ensured.

[0019] In the fourth technical solution and the related embodiments, the air passing channel corresponding to the first air outlet is formed between the first electrical component and the second electrical component, the structure of the first electrical component and the second electrical component and the layout of the protection assembly are fully utilized, the air flow of the first air outlet is beneficial to flow downward, and the heat of the first electrical component and the second electrical component can be taken away synchronously in the process of flowing downward.

[0020] In the fifth technical solution and the related embodiments, the reactor is arranged in the heat dissipation air channel, the independent heat dissipation air channel is used for dissipating heat of the reactor, and the heat dissipation efficiency of the reactor is high; the air guide surface is further arranged on the cover body, so that the air flow of the air passing channel is adapted to flow downward in an inclined manner, and the cold air can further flow to the air flow blind area or the area with a smaller air volume, so that the heat dissipation efficiency of the protection assembly as a whole is improved. Therefore, the structure of the cover body and the layout of the reactor in the containing cavity are fully utilized to form the air channel, and the structure is ingenious.

[0021] In the sixth technical solution and the related embodiments, the cover body includes a vertical section and two horizontal sections, the two horizontal sections are respectively located at two ends of the vertical section in the Y-axis direction, and the outer wall of the horizontal section can guide the air flow of the air passing opening to the second side wall, so that the air flow blind area in the containing cavity is further avoided, the inner wall of the two horizontal sections is more beneficial to the air pressure balance in the vertical section, and the air flow is more beneficial to the air outlet heat dissipation. In addition, the structure of the cover body makes the air flow in the vertical section more easily enter the second centrifugal fan, and the air outlet is more smooth. The reactor is arranged in the vertical section of the cover body, which is beneficial to the installation of the reactor with a relatively heavy weight, the second centrifugal fan is arranged in the horizontal section, which is beneficial to the reversing of the air flow and reduces the footprint compared with the axial fan; the projection of the vertical section and the air passing opening located at the bottom along the X-axis direction along the Y-axis direction are staggered with each other, so that the air flow of the air passing opening is avoided to be blocked by the cover body.

[0022] In the seventh technical solution and the related embodiments, the air passing opening is at least partially located between the first electrical component and the third electrical component, so that the first electrical component and the second electrical component can be cooled by the cold air discharged from the first air outlet, and the third electrical component can be cooled by the cold air discharged from the air passing opening, and the heat dissipation efficiency is high.

[0023] In the eighth technical solution and related embodiments, the air guide surface of the cover body can guide the air flow of the first air outlet to the third electrical component and the fourth electrical component respectively, thereby improving the heat dissipation efficiency of the third electrical component and the fourth electrical component, and the two air guide surfaces are conducive to the rotation of the air flow in the vertical section, thereby facilitating the air outlet in the horizontal section. The second electrical component is a capacitor module, and the air passage is formed between the electrical plate of the capacitor module and the first electrical component, thereby fully utilizing the structure of the capacitor module to form the air passage. The first electrical component is a direct-current electrical component. The third electrical component is a fuse. The fourth electrical component is an alternating-current electrical component, which not only facilitates the wiring of each electrical component of the protection assembly, but also enables each electrical component to have high heat dissipation efficiency.

[0024] In the ninth technical solution and related embodiments, the first movable door forms a first side wall when it is fixed, and the partition plate is close to the first end. In actual application, in order to ensure the protection and electrical safety, a sealing plate is arranged when the first movable door is opened to avoid direct exposure of the protection assembly. In order to improve the protection, a sealing strip is usually arranged around the first movable door, and there is a gap between the sealing plate and the first movable door when they are fixed. Therefore, the technical solution fully utilizes the structure of the cabinet body to form an air passage, that is, the partition plate can exist as a sealing plate of the protection assembly, or can cooperate with the movable door to form an air passage, thereby maximizing the space of the power cabinet along the X-axis direction, and the structure is ingenious and the cost is low.

[0025] In the tenth technical solution and related embodiments, the protection assembly in the accommodation cavity is mainly cooled by liquid cooling and air cooling. The liquid cooling has high heat dissipation efficiency, and since the air cooling heat exchanger and the liquid cooling unit are cooled by external circulation, the protection of the accommodation cavity can be improved. The fifth electrical component is cooled by the heat sink, so that the overall temperature of the fifth electrical component is low. Placing the fifth electrical component close to the hot air return air outlet is conducive to the temperature balance of each electrical component. The sixth electrical component is placed at the bottom of the accommodation cavity, so that the bottom air passage can quickly remove the heat of the sixth electrical component and then dissipate the heat of other electrical components. In actual application, the sixth electrical component generates less heat, thereby ensuring the balanced heat dissipation of each electrical component.

[0026] It can be seen that, in the technical solution, the combination of liquid cooling and air cooling can maximize the heat dissipation efficiency of the protection assembly in the protection cavity, and the protection cavity has good protection. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1Schematic diagram of power cabinet of the embodiment of the present application Figure 1 ;

[0029] Figure 2 Schematic diagram of power cabinet of the embodiment of the present application Figure 2 ;

[0030] Figure 3 Schematic diagram of the inside of the power cabinet of the embodiment of the present application Figure 1 ;

[0031] Figure 4 Schematic diagram of the inside of the power cabinet of the embodiment of the present application Figure 2 , wherein the cover hides a horizontal section

[0032] Figure 5 Schematic diagram of the wind direction flow of Figure 4 ;

[0033] Figure 6 Schematic diagram of the cover of the embodiment of the present application

[0034] Figure 7 Schematic diagram of the second side wall of the embodiment of the present application

[0035] Figure 8 Schematic diagram of the waterproof structure of the embodiment of the present application

[0036] Figure 9 Schematic diagram of the first side wall of the hidden part of the embodiment of the present application

[0037] Figure 10 Schematic diagram of the air guide of the embodiment of the present application Figure 1 ;

[0038] Figure 11 Schematic diagram of the air guide of the embodiment of the present application Figure 2 .

[0039] Explanation of main reference signs:

[0040] Cabinet 10; first side wall 11; first air inlet 111; second air inlet 112; second side wall 12; first air outlet 121; third air outlet 122; first abutting wall 13; second abutting wall 14; second air outlet 15; cover body 16; vertical section 161; air guide surface 1611; air guide surface 1612; horizontal section 162; third air inlet 17; supporting plate 18; hot air return air outlet 181; cold air air outlet 182; partition plate 19; air passage 191; protection cavity 01; first ventilation cavity 02; second ventilation cavity 03; accommodating cavity 04; air passage cavity 05; air-cooled heat exchanger 20; heat exchange device 30; liquid cooling unit 31; radiator 32; air guide piece 40; first air outlet 41; second air outlet 42; protection assembly 50; first electrical component 51; second electrical component 52; electrical plate component 521; third electrical component 53; fourth electrical component 54; electric reactor 55; fifth electrical component 56; sixth electrical component 57; waterproof structure 60; frame body 61; blade 62; first guide plate 63; second guide plate 64. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as exclusion of other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] In the claims, specification, and above drawings of the present application, unless otherwise expressly defined, the terms such as "first", "second", or "third" are used only to distinguish different objects, and are not used to describe a specific sequence.

[0043] In the claims, specification, and above drawings of the present application, unless otherwise expressly defined, the terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "back", "left", "right", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation and position relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present application.

[0044] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0045] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0046] In the claims and the description other than the embodiments, the terms "X-axis direction," "Y-axis direction," and "Z-axis direction" only refer to a feature having one of the aforementioned directions being perpendicular to a feature having another direction, and do not require that they be implemented according to the "X-axis direction," "Y-axis direction," and "Z-axis direction" described in the embodiments. In the embodiments, the X-axis direction is perpendicular to both the Y-axis direction and the Z-axis direction. The X-axis direction can be divided into left and right, the Y-axis direction into front and back, and the Z-axis direction into up and down.

[0047] See Figures 1-11 , Figures 1-11 A power cabinet is shown, including a cabinet 10, an air-cooled heat exchanger 20, a heat exchange device 30, an air guide 40, a protective assembly 50, and a second centrifugal fan (not shown in the figure).

[0048] See Figures 1-2 The cabinet 10 is rectangular in shape. The cabinet 10 has a first side wall 11 and a second side wall 12 that are opposite to each other and extend vertically along the X-axis. The cabinet 10 has a first abutting wall 13 and a second abutting wall 14 that are opposite to each other and extend vertically along the Y-axis.

[0049] See Figures 3-4 The cabinet 10 is provided with a relatively sealed protective cavity 01 and a first ventilation cavity 02 and a second ventilation cavity 03 located above the protective cavity 01. The projection of the protective cavity 01 in the vertical direction overlaps at least partially with the projections of the first ventilation cavity 02 and the second ventilation cavity 03 in the vertical direction. In this embodiment, the second ventilation cavity 03, the first ventilation cavity 02 and the protective cavity 01 are arranged sequentially from top to bottom, and the projection of the protective cavity 01 in the vertical direction covers the first ventilation cavity 02 and the second ventilation cavity 03. Figures 3-4 In the middle, the lengths of the protective cavity 01, the first ventilation cavity 02 and the second ventilation cavity 03 along the X-axis and Y-axis directions are all close to the same.

[0050] The first side wall 11 is provided with a first air inlet 111 corresponding to the first ventilation cavity 02 and a second air inlet 112 corresponding to the second ventilation cavity 03; the second side wall 12 is provided with a first air outlet 121 corresponding to the first ventilation cavity 02, and the top of the second ventilation cavity 03 is provided with a second air outlet 15. The first air outlet 121 is adapted to upward air outlet, and in actual application, an upper air baffle can be installed at the first air outlet 121. The upper air baffle belongs to the prior art, and will not be described in detail in this embodiment.

[0051] The cabinet body 10 is further provided with a cover body 16 which is at least partially located in the protection cavity 01 or below the protection cavity 01 and forms an independent heat dissipation air duct. Figures 3-4 In this embodiment, the cover body 16 is completely located in the protection cavity 01, and the cover body 16 is arranged at the bottom of the protection cavity 01. The cover body 16 includes a vertical section 161 and two horizontal sections 162 extending along the X-axis direction, and the two horizontal sections 162 are respectively located at the two ends of the vertical section 161 in the Y-axis direction. The bottom of the cabinet body 10 is provided with a third air inlet 17 communicating with the bottom end of the vertical section 161, and the vertical section 161 is substantially located at the middle of the protection cavity 01 along the X-axis direction and the Y-axis direction. The two horizontal sections 162 are respectively close to the first abutting wall 13 and the second abutting wall 14, see Figure 4 and Figure 6 The top of the vertical section 161 is provided with a wind guiding surface 1611 parallel to the X-axis and the Y-axis and two wind guiding surfaces 1612 located at the two ends of the wind guiding surface 1611 along the X-axis direction. The two wind guiding surfaces 1612 are arranged along the X-axis direction and gradually away from each other from top to bottom in an eight-shaped manner.

[0052] In this embodiment, the third air inlet 17 of the heat dissipation air duct is formed on the first side wall 11, the second side wall 12, the first abutting wall 13 and the second abutting wall 14. The second side wall 12 is provided with a third air outlet 122 communicating with the two horizontal sections 162 and adapted to upward air outlet, that is, the third air outlet 122 of the heat dissipation air duct is formed on the second side wall 12. A second centrifugal fan (not shown in the figure) is arranged in the horizontal section 162 and adapted to guide the airflow of the vertical section 161 along the X-axis direction to the third air outlet 122.

[0053] The waterproof structure 60 can be installed at the third air outlet 122. See Figures 7-8 The waterproof structure 60 includes a frame 61 arranged on the second side wall 12 and a plurality of blades 62. The frame 61 is fixedly connected with the second side wall 12, and the blades 62 are arranged in the frame 61 in a vertical direction and extend along the Y-axis direction. Each blade 62 includes a first guide plate 63 inclined outward from top to bottom and a second guide plate 64 arranged on the upper surface of the first guide plate 63 and inclined inward from top to bottom.

[0054] Still referring to Figures 3-4The protection cavity 01 and the first ventilation cavity 02 are separated by the support plate 18, and the support plate 18 is provided with a hot air return port 181 and a cold air outlet 182 along the X-axis direction, wherein the hot air return port 181 is close to the second side wall 12.

[0055] In the embodiment, the protection cavity 01 close to the first side wall 11 is provided with a partition plate 19 extending along the vertical direction, and the partition plate 19 separates the protection cavity 01 into a through-cavity 05 close to the first side wall 11 and only used for air passing and a containing cavity 04 close to the second side wall 12, the through-cavity 05 is only used for air passing, which means that the through-cavity 05 is not used for placing the protection assembly; the through-cavity 05 and the containing cavity 04 are respectively communicated with the cold air outlet 182 and the hot air return port 181, Figures 3-4 In the embodiment, the cold air outlet 182 and the hot air return port 181 are both above the containing cavity 04. Referring to Figure 9 The partition plate 19 is provided with a plurality of air passing ports 191 along the vertical direction, and at least part of the air passing ports 191 are located at the bottom of the partition plate 19; wherein the vertical section 161 of the cover body 16 and the projection of the air passing port 191 located at the bottom along the X-axis direction are staggered along the Y-axis direction. Figure 9 In the embodiment, the air passing port 191 at the bottom is two, and the two air passing ports 191 correspond to the gap between the vertical section 161 of the cover body 16 and the first abutting wall 13 and the gap between the vertical section 161 of the cover body 16 and the second abutting wall 14 respectively.

[0056] The air-cooled heat exchanger 20 is placed in the first ventilation cavity 02 and supported on the support plate 18, and is communicated with the hot air return port 181 and the cold air outlet 182 to cool the hot air of the hot air return port 181 into the cold air of the cold air outlet 182; in actual application, the outer circulation air duct of the air-cooled heat exchanger 20 is communicated with the first air inlet 111 and the first air outlet 121, the inner circulation air duct of the air-cooled heat exchanger 20 is communicated with the hot air return port 181 and the cold air outlet 182, and the outer circulation air duct and the inner circulation air duct are heat exchanged with each other to cool the hot air of the hot air return port 181 into the cold air of the cold air outlet 182.

[0057] The heat exchange device 30 includes a liquid cooling unit 31 placed in the second ventilation cavity 03 and a heat sink 32 placed in the protection cavity 01 and communicated with the cooling flow channel of the liquid cooling unit 31, and the heat sink 32 is a liquid cooling plate in the embodiment, and the cooling flow channel of the liquid cooling unit 31 is heat exchanged with the circulating air flow of the second air inlet 112 to the second air outlet 15 to realize cooling. The liquid cooling unit 31 belongs to the prior art, and details are not repeated in the embodiment.

[0058] Referring to Figures 3-4 and Figures 10-11The air guide 40 extends along the X-axis direction and is arranged in the protection cavity 01. An upper end of the air guide 40 is connected to the cold air outlet 182. One end of the air guide 40 close to the hot air return port 181 is provided with a first air outlet 41 for downward air outlet to deliver cold air to the containing cavity 04. The other end of the air guide 40 away from the hot air return port 181 is provided with a second air outlet 42 for air outlet to the air passing cavity 05. The air guide 40 is provided with a first centrifugal fan (not shown in the figure). The first centrifugal fan is adapted to drive the air flow of the hot air return port 181 to the cold air outlet 182 and make the air volume of the second air outlet 42 greater than that of the first air outlet 41. Figures 10-11 In the embodiment, the first air outlet 41 and the second air outlet 42 are both two. The two first air outlets 41 are arranged along the X-axis direction and extend along the Y-axis direction. The two second air outlets 42 are arranged along the Y-axis direction and are adapted to air outlet along the X-axis direction. Of course, in other embodiments, the second air outlet 42 can also be inclined to air outlet downward. Figures 3-4 In the embodiment, the second air outlet 42 and the hot air return port 181 are away from each other along the X-axis direction. The bottom air passing port 191 and the hot air return port 181 are respectively located at two most distant corners of the containing cavity 04.

[0059] The protection assembly 50 is arranged in the containing cavity 04 in the protection cavity 01. The protection assembly 50 includes an electric reactor 55 arranged in the heat dissipation air duct and an electrical assembly arranged outside the heat dissipation air duct and in the containing cavity 04. The electric reactor 55 is arranged in the vertical section 161 of the cover body 16. The electrical assembly is at least partially cooled by the heat sink 32 and at least partially cooled by the cold air delivered by the air-cooled heat exchanger 20. In the embodiment, the electrical assembly is at least partially cooled by the circulating air flow from the air passing port 191 to the hot air return port 181 and at least partially cooled by the circulating air flow from the first air outlet 41 to the hot air return port 181.

[0060] In the embodiment, the projection of the protection cavity 01 along the vertical direction covers the first ventilation cavity 02 and the second ventilation cavity 03. The power cabinet as a whole occupies a small space along the X-axis direction, which is beneficial to reduce the required floor area of multiple power cabinets when the power cabinets are combined. When multiple power cabinets are used side by side along the X-axis direction or the Y-axis direction, the required floor area of the multiple power cabinets used side by side can be reduced as a whole. In addition, since the first ventilation cavity 02 and the second ventilation cavity 03 are located above the protection cavity 01, the air inlets of the first ventilation cavity 02 and the second ventilation cavity 03 are necessarily away from the ground. Therefore, the air inlet temperature of the air-cooled heat exchanger 20 is relatively low, which ensures that the air flow of the cold air outlet 182 always has a low temperature and makes the heat dissipation efficiency of the liquid cooling unit 31 high.

[0061] In the embodiment, the cabinet 10 forms an air inlet surface and an air outlet surface on two sides along the X-axis direction. In actual application, the first air inlet 111 and the first air outlet 121 of the first ventilation cavity 02 are in communication with the outer circulating air duct of the air-cooled heat exchanger 20, and the second air inlet 112 and the second air outlet 15 of the second ventilation cavity 03 are in communication with the outer circulating air duct of the liquid-cooled unit 31. Therefore, the above arrangement avoids the short circuit of hot air flow caused by the backflow of hot air from the first air outlet 121 to the first air inlet 111, and also avoids the inflow of hot air from the second air outlet 15 into the second air inlet 112 or the air inlet of the power cabinet downstream, thereby improving the heat dissipation efficiency of the protection assembly 50. Since the air inlet surface and the air outlet surface are located on two sides of the cabinet 10 along the X-axis direction, the above arrangement also creates conditions for the power cabinet to be stacked along the Y-axis direction.

[0062] In the embodiment, the first air outlet 121, the second air outlet 15 and the third air outlet 122 are adapted to discharge air upward, so that the power cabinet forms a structure for discharging air upward. Since hot air has a lower density, the hot air discharged from the first air outlet 121, the second air outlet 15 and the third air outlet 122 is not easy to flow downward into the power cabinet downstream, so that when multiple power cabinets are used side by side along the X-axis direction, the hot air from the air outlet of the upstream power cabinet will not affect the air inlet of the power cabinet downstream. In addition, the water inlet surface that may exist in the protection cavity 01 is reduced. In the embodiment, the water inlet surface is mainly formed on the upper cavity wall of the protection cavity 01. Compared with the technical solution in which the liquid-cooled unit 31 is located above the protection cavity 01 and the air-cooled heat exchanger 20 is located beside the protection cavity 01, the part of the protection cavity 01 connected with the outer circulating heat dissipation is reduced. As known by those skilled in the art, the part of the outer circulation needs to be waterproofed, so that the above arrangement reduces the water inlet surface that may exist in the protection cavity 01, improves the protection of the protection cavity 01 and reduces the protection cost.

[0063] In addition, the above arrangement also makes the electrical components in the protection cavity 01 mainly dissipate heat through liquid cooling and air cooling. The liquid cooling has high heat dissipation efficiency, and since the air-cooled heat exchanger 20 and the liquid-cooled unit 31 both dissipate heat through outer circulation, the protection of the protection cavity 01 can be improved. The liquid cooling and air cooling cooperatively maximize the heat dissipation efficiency of the protection assembly 50 in the protection cavity 01, and the protection of the protection cavity 01 is good. The reactor 55 is located in a separate heat dissipation air duct, and has high heat dissipation efficiency.

[0064] The cover body 16 is located in the protection cavity 01, so that the protection assembly 50 is basically located in the protection cavity 01, and the protection is high; since the cover body 16 is located in the protection cavity 01, the waterproof requirement of the cover body 16 is higher, in the embodiment, the waterproof structure 60 is arranged at the third air outlet 122, the first guide plate 63 and the second guide plate 64 are arranged on the blade 62, the first guide plate 63 is inclined outward from top to bottom, when rain hits the first guide plate 63, the water flow will flow downward along the first guide plate 63, thereby achieving the purpose of waterproofing, at the same time, the second guide plate 64 is inclined inward from top to bottom, and when the air flow is sent out from the louver, the air flow is sent out in an oblique upward direction, thereby avoiding that the hot air is accumulated at the lower side of the power cabinet; at the same time, the second guide plate 64 can also prevent rain from entering the louver when the rain splashes upward from the ground, thereby avoiding water entering the heat dissipation air duct, and improving the protection of the protection cavity 01.

[0065] In the embodiment, since the air passing cavity 05 is only used for air passing, in actual operation, the length of the air passing cavity 05 along the X-axis direction can be reduced as much as possible, and the length of the containing cavity 04 along the X-axis direction is increased, so that the air pressure and flow rate of the air flow in the air passing cavity 05 are increased, the air flow of the air passing opening 191 is facilitated, and the rapid flow of the air flow in the containing cavity 04 is facilitated, thereby creating conditions for improving the heat dissipation efficiency of the protection assembly 50, and the containing cavity 04 has a large space; the cold air of the cold air outlet 182 can flow into the relatively low-pressure containing cavity 04 through the air passing opening 191 after flowing into the air passing cavity 05, in actual application, the air passing opening 191 can be arranged on the partition plate 19 for places in the containing cavity 04 that are not easy to pass air, thereby avoiding the formation of an air flow blind area in the containing cavity 04, in the embodiment, at least part of the air passing opening 191 is located at the bottom of the partition plate 19, since the hot air return opening 181 is close to the second side wall 12, the cold air flowing out of the air passing opening 191 can flow through the bottom of the containing cavity 04 and then flow upward, thereby avoiding the formation of an air flow blind area at the bottom of the containing cavity 04, and avoiding the formation of an air flow blind area on one side of the second side wall 12, since the air passing opening 191 on the partition plate 19 is arranged in the vertical direction, multiple layers of cold air flow can be formed in the vertical direction, and the multiple layers of cold air flow can simultaneously carry away the heat of the protection assembly 50 in the process of flowing toward the hot air return opening 181, thereby improving the heat dissipation efficiency of the protection assembly 50, and without the need of the turbulent fan, the air flow can be distributed everywhere in the containing cavity 04, thereby facilitating later maintenance.

[0066] In the embodiment, the air-cooled heat exchanger 20 has a specific specification, and the distance between the cold air outlet 182 and the hot air return outlet 181 corresponding to the internal circulation air duct cannot be too far. The air guide member 40 is arranged to shorten the distance between the cold air outlet 182 and the hot air return outlet 181, thereby facilitating the arrangement of the air-cooled heat exchanger 20. The hot air return outlet 181 and the cold air outlet 182 are both located above the accommodation cavity 04. The air flow of the cold air outlet 182 is guided by the air guide member 40 to the air passing cavity 05 in a direction away from the hot air return outlet 181, so that the length of the air passing cavity 05 in the X-axis direction can be reduced as much as possible, thereby accelerating and pressurizing the air flow flowing into the air passing cavity 05 from the second air outlet 42, and then accelerating the air flow flowing out through the air passing opening 191, so that the heat of the protection assembly 50 can be quickly taken away. The protection assembly 50 is also adapted to dissipate heat by the circulation air flow from the first air outlet 41 to the hot air return outlet 181, so that multiple clusters of cold air flow in different directions can be formed in the accommodation cavity 04, further avoiding the air flow blind area and improving the heat dissipation efficiency. In actual application, the part of the protection assembly 50 with relatively low heat generation can be placed at the first air outlet 41 to ensure balanced heat dissipation of the protection assembly 50. The air guide member 40 is provided with a first centrifugal fan. Compared with an axial flow fan, the centrifugal fan has a smaller footprint and can realize air flow reversing. The air volume of the second air outlet 42 is greater than that of the first air outlet 41, which ensures that most of the cold air flows into the air passing cavity 05 and ensures balanced heat dissipation of the protection assembly 50.

[0067] In the embodiment, the cover body 16 includes a vertical section 161 and two horizontal sections 162. The two horizontal sections 162 are respectively located at both ends of the vertical section 161 in the Y-axis direction. The outer wall of the horizontal section 162 can guide the air flow of the air passing opening 191 to the second side wall 12, further avoiding the air flow blind area in the accommodation cavity 04. The inner wall of the two horizontal sections 162 is more conducive to the air pressure balance in the vertical section 161, thereby being more conducive to air outlet heat dissipation. In addition, the structure of the cover body 16 makes the air flow in the vertical section 161 more easily enter the second centrifugal fan, and the air outlet is smoother. The reactor 55 is arranged in the vertical section 161 of the cover body 16, which is conducive to the installation of the heavy reactor 55. The second centrifugal fan is arranged in the horizontal section 162, which is conducive to realizing air flow reversing and reducing the footprint compared with an axial flow fan. The projection of the vertical section 161 and the air passing opening 191 located at the bottom along the X-axis direction is staggered along the Y-axis direction, thereby avoiding the cover body 16 blocking the air flow of the air passing opening 191.

[0068] In specific implementation, the electrical assembly includes a first electrical component 51, a second electrical component 52, a third electrical component 53, a fourth electrical component 54, a fifth electrical component 56, and a sixth electrical component 57.

[0069] Specifically, the first electrical component 51 is a direct current electrical component close to the partition 19, the second electrical component 52 is a capacitor module, the first electrical component 51 and the second electrical component 52 are arranged along the X-axis direction and close to the first air outlet 41, the capacitor module includes an electrical plate 521 in a plate structure and adapted to carry a plurality of electrical units, the electrical plate 521 extends along the vertical direction and forms an air passage with the first electrical component 51.

[0070] The third electrical component 53 is a fuse, the third electrical component 53 is close to the partition 19 and located below the first electrical component 51, and the air passage 191 is at least partially located between the first electrical component 51 and the third electrical component 53.

[0071] The fourth electrical component 54 is an alternating current electrical component, which is arranged on the bottom of the accommodating cavity 04 close to the second side wall 12, Figures 3-4 In particular, the fourth electrical component 54 is spaced apart from the bottom of the accommodating cavity 04, the third electrical component 53 is located downstream of the air flow guided by one of the air guiding faces 1612, and the fourth electrical component 54 is located downstream of the air flow guided by the other air guiding face 1612.

[0072] The fifth electrical component 56 is an IGBT power module, which is close to the hot air return air outlet 181 and located above the fourth electrical component 54, which is cooled by the heat sink 32, and the second electrical component 52 is higher than the cover 16 and forms an air guiding passage extending along the X-axis direction between the air guiding face 1611 to guide the air flow to the fifth electrical component 56.

[0073] The sixth electrical component 57 is an auxiliary transformer, which is arranged on the bottom of the accommodating cavity 04 close to the air passage 191 of the bottom, and has a relatively low heat dissipation, which is used to supply power to electrical components such as the first centrifugal fan, the second centrifugal fan, the controller, etc.

[0074] In particular, the electrical connection relationship of the protection assembly 50 is that the direct current electrical component is connected with the capacitor module, the capacitor module is connected with the IGBT power module, and the IGBT power module is connected with the alternating current electrical component through the reactor.

[0075] Referring to Figures 4-5The air flow direction of the protection cavity 01 is that the air flow from the cold air outlet 182 flows out through the first air outlet 41 and the second air outlet 42, the cold air flowing out through the first air outlet 41 passes through the air passage and takes away the heat of the first electrical component 51 and the second electrical component 52, then is guided by the air guide surface 1612 to flow obliquely downward to take away the heat of the third electrical component 53 and the fourth electrical component 54, then flows to the second side wall 12 under the guidance of the horizontal section 162 of the cover body 16, then flows upward and flows into the hot air return air outlet 181 after passing through the fifth electrical component 56, and part of the cold air flows to the fifth electrical component 56 through the air guide passage to take away the heat of the fifth electrical component 56, then flows upward into the hot air return air outlet 181; the cold air flowing out through the second air outlet 42 flows into the air passage 05, the flow rate is accelerated in the air passage 05 and a larger air pressure is formed, then flows out through the air passage 191, part of the cold air passes through the third electrical component 53 to take away the heat of the third electrical component 53, part of the cold air flows out from the bottom air passage 191, passes through the sixth electrical component 57 to take away the heat of the sixth electrical component 57, then flows to the fourth electrical component 54 through the gap between the vertical section 161 of the cover body 16 and the first abutting wall 13 and the second abutting wall 14 to take away the heat of the fourth electrical component 54, then flows upward through the fifth electrical component 56 to take away the heat of the fifth electrical component 56 and then flows into the hot air return air outlet 181.

[0076] It can be known that the above arrangement fully utilizes the structure of the first electrical component 51 and the second electrical component 52 and the layout of the protection assembly 50 to form the air passage, which is beneficial to the downward flow of the air flow of the first air outlet 41 and can take away the heat of the first electrical component 51 and the second electrical component 52 synchronously in the process of downward flow. The structure of the cover body 16 (the air guide surface 1611 and the air guide surface 1612) and the layout of the electrical reactor 55 are combined to form the air passage in the accommodating cavity 04, which is combined with the arrangement of the air passage 191 and is beneficial to taking away the heat of the third electrical component 53 and the fourth electrical component 54. The two air guide surfaces 1612 are beneficial to the rotation of the air flow in the vertical section 161, thereby being beneficial to the air outlet. The fifth electrical component 56 is cooled by the heat sink 32, so that the temperature of the fifth electrical component 56 as a whole is not high. The fifth electrical component 56 is placed close to the hot air return air outlet 181 and the heat thereof is taken away through the air guide passage, thereby avoiding the local temperature of the fifth electrical component 56 from being too high. The sixth electrical component 57 generates a small amount of heat, and the sixth electrical component 57 is close to the bottom air passage 191. The temperature of the sixth electrical component 57 will not be too high after the cold air passes through the sixth electrical component 57, thereby ensuring the balanced heat dissipation of other electrical components. Therefore, the above arrangement also makes the wiring of the first to sixth electrical components convenient and makes each electrical component have a higher heat dissipation efficiency and balanced overall heat dissipation.

[0077] In the embodiment, the first end and the second end of the cabinet 10 along the X-axis direction are respectively provided with a first movable door and a second movable door, the first movable door and the second movable door are fixed to form a first side wall 11 and a second side wall 12 respectively, and the baffle 19 is close to the first end; the second side wall 12 is adapted to be sealingly connected with the two horizontal sections 162 of the cover body 16 to make the horizontal sections 162 communicate with the third air outlet 122.

[0078] The first movable door is fixed to form the first side wall 11, and the baffle 19 is close to the first end. In actual application, in order to ensure the protection and the safety of electricity use, a sealing plate is arranged when the first movable door is opened to avoid the direct exposure of the protection assembly 50, and in order to improve the protection, a sealing strip is usually arranged around the first movable door, and the sealing plate and the first movable door have a spacing when being fixed. Therefore, the above-mentioned arrangement fully utilizes the structure of the cabinet 10 itself to form the air passing cavity 05, that is, the baffle 19 can exist as the sealing plate of the protection assembly 50, and can also cooperate with the first movable door to form the air passing cavity 05, so as to maximize the reduction of the space of the power cabinet along the X-axis direction, the structure is ingenious, and the cost is low. The second movable door is fixed to form the second side wall 12, and the second side wall 12 is adapted to be sealingly connected with the two horizontal sections 162 of the cover body 16 to make the horizontal sections 162 communicate with the third air outlet 122, the air resistance is small, the air outlet is smooth, and the maintenance of the protection cavity 01 is facilitated.

[0079] The above description and embodiment of the application are used to explain the protection scope of the application, but do not constitute the limitation of the protection scope of the application. Through the inspiration of the application or the above-mentioned embodiment, the modification, equivalent replacement or other improvement of the embodiment of the application or one part of the technical features can be obtained by the ordinary skilled in the art combining with the common knowledge, the ordinary technical knowledge and / or the prior art in the field, through the logical analysis, reasoning or limited test, and should be included in the protection scope of the application.

Claims

1. A power cabinet with balanced heat dissipation, characterized in that, include The cabinet (10) has a first sidewall (11) and a second sidewall (12) arranged parallel to each other along the X-axis. A protective cavity (01) is provided between the first sidewall (11) and the second sidewall (12). A cold air outlet (182) and a hot air return outlet (181) are arranged along the X-axis on the top of the protective cavity (01). The hot air return outlet (181) is close to the second sidewall (12). A partition (19) extending vertically is provided in the protective cavity (01) near the first sidewall (11). The partition (19) divides the protective cavity (01) into two sections. The partition (19) is divided along the X-axis into an air passage cavity (05) near the first sidewall (11) and used only for air passage, and a receiving cavity (04) near the second sidewall (12). The air passage cavity (05) and the receiving cavity (04) are respectively connected to the cold air outlet (182) and the hot air return outlet (181). A plurality of air passages (191) are arranged vertically on the partition (19), and at least some of the air passages (191) are located at the bottom of the partition (19). The hot air return outlet (181) and the cold air outlet (182) are both located above the receiving cavity (04). A protective component (50) is placed in the accommodating cavity (04) and is adapted to dissipate heat from the circulating airflow from the air inlet (191) to the hot air return inlet (181).

2. The power cabinet with balanced heat dissipation as described in claim 1, characterized in that, It also includes air guide components (40); The air guide (40) extends along the X-axis direction, and its upper end is connected to the cold air outlet (182). The end of the guide near the hot air return outlet (181) is provided with a first air outlet (41) that discharges downward to deliver cold air to the accommodating cavity (04). The end of the guide away from the hot air return outlet (181) is provided with a second air outlet (42) that discharges air to the air passage cavity (05). The protective component (50) is also adapted to dissipate heat from the circulating airflow from the first exhaust port (41) to the hot air return port (181).

3. A power cabinet with balanced heat dissipation as described in claim 2, characterized in that, The air guide (40) is equipped with a first centrifugal fan, which is adapted to drive the airflow of the hot air return port (181) to the cold air outlet (182), and make the air volume of the second exhaust port (42) greater than the air volume of the first exhaust port (41).

4. A power cabinet with balanced heat dissipation as described in claim 3, characterized in that, The protective component (50) is provided with a first electrical component (51) and a second electrical component (52) arranged at intervals along the X-axis near the first exhaust port (41), and an air passage corresponding to the first exhaust port (41) is formed between the first electrical component (51) and the second electrical component (52).

5. A power cabinet with balanced heat dissipation as described in claim 4, characterized in that, It also includes a second centrifugal fan; the cabinet (10) is also provided with a cover (16), the second centrifugal fan is placed inside the cover (16), the cover (16) is placed at the bottom of the accommodating cavity (04) and forms an independent heat dissipation air duct, the cover (16) is provided with an air guide surface (1612) that is inclined relative to the vertical direction and the X-axis direction to make the airflow of the air duct suitable for inclined downward flow; the protective component (50) includes a reactor (55) placed inside the heat dissipation air duct.

6. A power cabinet with balanced heat dissipation as described in claim 5, characterized in that, The enclosure (16) includes a vertical section (161) and two horizontal sections (162) extending along the X-axis direction, the two horizontal sections (162) being located at the two ends of the top of the vertical section (161) along the Y-axis direction; the reactor (55) is placed inside the vertical section (161), and the second centrifugal fan is placed in the horizontal section (162) and adapted to guide the airflow of the vertical section (161) along the X-axis direction; the projection of the vertical section (161) and the air outlet (191) located at the bottom along the X-axis direction are offset from each other along the Y-axis direction.

7. A power cabinet with balanced heat dissipation as described in claim 6, characterized in that, The first electrical component (51) is close to the partition (19), and the protective assembly (50) further includes a third electrical component (53) which is close to the partition (19) and located below the first electrical component (51). The air vent (191) is at least partially located between the first electrical component (51) and the third electrical component (53).

8. A power cabinet with balanced heat dissipation as described in claim 7, characterized in that, The protective assembly (50) also includes a fourth electrical component (54), which is located near the second sidewall (12) at the bottom of the accommodating cavity (04). The vertical section (161) of the cover (16) is provided with two air guide surfaces (1612) that gradually move away from each other from top to bottom along the X-axis. The third electrical component (53) is located downstream of the airflow guided by one of the air guide surfaces (1612), and the fourth electrical component (54) is located downstream of the airflow guided by the other air guide surface (1612). The second electrical component (52) is a capacitor module, which includes an electrical board (521) with a plate-like structure and adapted to carry a plurality of electrical units. The electrical board (521) extends vertically and forms the air passage between itself and the first electrical component (51). The first electrical component (51) is a DC electrical component. The third electrical component (53) is a fuse. The fourth electrical component (54) is an AC electrical component.

9. A power cabinet with balanced heat dissipation as described in claim 1, characterized in that, The cabinet (10) has a first movable door at its first end along the X-axis direction, and the first movable door forms the first side wall (11) when it is fixed; the partition (19) is close to the first end.

10. A power cabinet with balanced heat dissipation as described in claim 1, characterized in that, It also includes a heat exchange device (30) and an air-cooled heat exchanger (20); the heat exchange device (30) includes a liquid-cooled unit (31) and a radiator (32) connected to the cooling channel of the liquid-cooled unit (31); the protective assembly (50) also includes a fifth electrical component (56) and a sixth electrical component (57), the fifth electrical component (56) being near the hot air return vent (181); the sixth electrical component (57) being near the bottom air vent (191) and located at the bottom of the receiving cavity (04); the radiator (32) is located in the receiving cavity (04). The cabinet (10) is also provided with a first ventilation chamber (02) and a second ventilation chamber (03); the liquid cooling unit (31) is placed in the first ventilation chamber (02) and is used to deliver cool liquid to the radiator (32) and recover hot liquid from the radiator (32); the air-cooled heat exchanger (20) is placed in the second ventilation chamber (03) and is connected to the hot air return port (181) and the cold air outlet (182) to cool the hot air at the hot air return port (181) into the cold air at the cold air outlet (182).

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