Electrical cabinet

Abstract

The utility model discloses an electrical cabinet, which comprises a cabinet body, a heat dissipation fan, a reactor and a power module, a first air duct, a second air duct and a third air duct are formed in the cabinet body, and the second air duct and the third air duct are both communicated with the first air duct. The first air duct, the second air duct and the third air duct are respectively provided with an air inlet, a first air outlet and a second air outlet which are communicated with the outside; the cooling fan is used for driving air to flow to the first air outlet and the second air outlet from the air inlet. The electric reactor is arranged in the second air duct; the power module is attached to the air duct outer wall of the third air duct. The reactor and the power module have high heat dissipation efficiency, the overall space of the cabinet body can be smaller, the cost is lower, and the number of installation procedures is smaller.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, specifically to an electrical cabinet. Background Technology

[0002] Electrical cabinets such as photovoltaic inverters and energy storage converters typically include IGBT power modules and reactors. IGBT power modules and reactors generate a lot of heat, so there are high requirements for heat dissipation.

[0003] In the existing technology, the reactor and the IGBT power module share the same air duct. The airflow passes through the reactor first and then through the IGBT power module, resulting in poor heat dissipation efficiency of the IGBT power module.

[0004] The second prior art is described in patent CN111465289A, see [link / reference]. Figure 1 The second air duct 25 is vertically integrated within the high-heat area 22, primarily used for independent heat dissipation of the inverter module 5 (IGBT power module) with high protection requirements and high heat generation. The inverter module 5 receives heat dissipation through the second air duct 25 and also receives auxiliary heat dissipation through the heat exchanger 4, ensuring effective heat dissipation for the high-heat inverter module 5. The reactor module 8 is located at the bottom of the cabinet, directly below the air inlet of the first air duct 24. Cool air flows through the reactor module 8, carrying away heat, and then exits the cabinet 1 through the first air duct 24. The air inlets of both the first air duct 24 and the second air duct 25 are connected to the secondary protection area at the bottom of the cabinet 1, and the air outlets of both the first air duct 24 and the second air duct 25 are connected to the top area of ​​the cabinet 1, allowing for bottom-to-top exhaust cooling within the cabinet 1. A first fan 91 and a second fan 92 are respectively installed at the positions of the air outlets of the first air duct 24 and the second air duct 25. The first fan 91 is mainly used to exhaust and cool the first cabinet 11 on the side where the first air duct 24 is located, and the second fan 92 is mainly used to exhaust and cool the second cabinet 12 on the side where the second air duct 25 is located. When the first fan 91 and the second fan 92 are operating normally, cold air enters the cabinet 1 through the air inlet louvers, flows upward from the bottom of the cabinet 1, and reaches the top area of ​​the cabinet 1 through the first air duct 24 and the second air duct 25 respectively, and is then discharged from the left and right air outlet louvers on the top of the cabinet 1 respectively.

[0005] The solution has the following drawbacks: First, the air inlet of the second air duct 25 is connected to the secondary protection area inside the cabinet 1, occupying the space of the secondary protection area. Meanwhile, the first air duct 24, which is used to dissipate heat from the reactor module 8, extends into the main protection area, occupying the space of the main protection area. This not only requires a larger space for the electrical cabinet as a whole, resulting in a larger space occupation, but also may cause the airflow protected by the secondary protection area to enter the main protection area, leading to a decrease in the protection level of the main protection area. Second, the first air duct 24 and the second air duct 25 are two independent air ducts with longer air paths and more air duct components. This requires more air inlets, more fans, and more air duct plates, resulting in higher costs and more installation procedures. Utility Model Content

[0006] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background technology and provide an electrical cabinet that, compared with the prior art, has higher heat dissipation efficiency for both the reactor and the power module, and compared with the prior art, has a smaller overall cabinet space, lower cost and fewer installation steps.

[0007] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0008] Technical solution one and its related embodiments provide an electrical cabinet, including a cabinet body, in which a first air duct, a second air duct and a third air duct are formed, the second air duct and the third air duct are both connected to the first air duct, the first air duct, the second air duct and the third air duct are respectively provided with an air inlet, a first air outlet and a second air outlet connected to the outside; a cooling fan, which drives air to flow from the air inlet to the first air outlet and the second air outlet respectively; a reactor, which is placed in the second air duct; and a power module, which is attached to the outer wall of the third air duct.

[0009] Based on technical solution one, there is also technical solution two. In technical solution two and its related embodiments, the air inlet is located in the middle of the cabinet height direction, and the first air outlet and the second air outlet are located at the bottom and top of the cabinet, respectively.

[0010] Based on technical solution two, there is also technical solution three. In technical solution three and its related embodiments, the cabinet is provided with a first side wall and a second side wall that are arranged along the X-axis and extend vertically opposite each other. The air inlet is opened on the first side wall, and the first air outlet and the second air outlet are both opened on the second side wall.

[0011] Based on technical solution three, there is also technical solution four. In technical solution four and its related embodiments, there is also a protective cover; the protective cover is installed at the air inlet and fixed to the first side wall, and the bottom end of the protective cover is provided with an air inlet.

[0012] Based on technical solution four, there is also technical solution five. In technical solution five and its related embodiments, a filter element is provided inside the protective cover near the air inlet, extending obliquely from bottom to top away from the first side wall, and the filter element is provided with filter cotton.

[0013] Based on any one of technical solutions three to five, a technical solution six is ​​also provided. In technical solution six and its related embodiments, the cooling fan is placed inside the first air duct; the power module extends in a vertical direction; the third air duct includes a cooling air duct extending in a vertical direction, and the power module is attached to the outer wall of the cooling air duct.

[0014] Based on technical solution six, technical solution seven is also provided. In technical solution seven and its related embodiments, the power module includes a plurality of power units that are spaced apart along the Y-axis, extend vertically, and are parallel to the X-axis; the heat dissipation duct includes heat dissipation sub-ducts that are equal in number to and correspond one-to-one with the power units, each heat dissipation sub-duct is arranged along the Y-axis and connected to the first duct in the vertical direction; each power unit is respectively attached to the outer wall of the duct of each heat dissipation sub-duct.

[0015] Based on technical solution seven, there is also technical solution eight. In related embodiments of technical solution eight, the first side of the heat dissipation sub-channel along the Y-axis direction is provided with a heat dissipation wall perpendicular to the Y-axis direction, and the power unit is attached to and fixed to the outer surface of the heat dissipation wall; the heat dissipation sub-channel is provided with a plurality of heat dissipation fins spaced apart along the X-axis direction and extending vertically; the heat dissipation fins protrude from the inner surface of the heat dissipation wall.

[0016] Based on technical solution seven, technical solution nine is also provided. In technical solution nine and its related embodiments, the first air duct is provided with a number of first sub-air ducts that are equal to and correspond one-to-one with each heat dissipation sub-air duct, and an air inlet duct that connects each first sub-air duct and the air inlet. The upper surface of the first sub-air duct is provided with a first air outlet that connects to the corresponding heat dissipation sub-air duct, and the lower surface of the first sub-air duct is provided with a second air outlet that connects to the second air duct. The air passage area of ​​the second air outlet is smaller than the air passage area of ​​the first air outlet.

[0017] Based on technical solution seven, technical solution ten is also provided. In technical solution ten and its related embodiments, the third air duct is further provided with a third sub-air duct extending along the X-axis direction and connected to each heat dissipation sub-air duct in the vertical direction. The third sub-air duct is provided with a guide wall that extends obliquely from top to bottom towards the bottom of the second air outlet.

[0018] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0019] In the first technical solution and its preferred embodiment, since the reactor is placed inside the second air duct and the power module is attached to the outer wall of the third air duct, both the reactor and the power module are cooled by independent air ducts, resulting in higher heat dissipation efficiency compared to the power module in the prior art. Because the second and third air ducts share a single first air duct, the overall space occupied by each air duct is smaller than that in the prior art, allowing for a smaller cabinet. Furthermore, the shared first air duct results in a shorter air path, requiring only one air inlet on the cabinet, which is more conducive to manufacturing and requires fewer air duct panels, leading to lower costs. The power module's attachment to the outer wall of the third air duct allows for indirect cooling through the third air duct, while also ensuring the power module's protection.

[0020] In the second technical solution and its preferred embodiment, the air inlet is located in the middle of the cabinet height direction, that is, the first air inlet is far from the ground. The airflow entering through the first air inlet has a low inlet temperature, resulting in high heat dissipation efficiency for the reactor and power module. The first air outlet and the second air outlet are located at the bottom and top of the cabinet, respectively. Combined with the air inlet being located in the middle of the cabinet height direction, on the one hand, it is beneficial for the second and third air ducts to be far apart from each other and not interfere with each other, avoiding heat accumulation caused by heat radiation when they are close together. On the other hand, it is beneficial for the reactor and power module to be located at the top and bottom of the cabinet, respectively. This allows for a high protection area to be set at the top of the cabinet and a low protection area to be set at the bottom of the cabinet, reducing the possibility of a decrease in protection level due to sealing failure. It also allows the reactor to be located at the bottom of the cabinet. Since the reactor is generally a large and heavy module, placing the reactor at the bottom of the cabinet can make reasonable use of the load-bearing structure of the entire cabinet and increase the stability of the reactor inside the electrical cabinet.

[0021] In the third technical solution and its preferred embodiment, the air inlet is located on the first side wall, and both the first and second air outlets are located on the second side wall. This keeps the air inlet away from the first and second air outlets, making it difficult for hot air to flow into the air inlet and preventing short-circuiting of the hot airflow. Furthermore, this positions the air inlet and outlet surfaces of the cabinet on opposite sides of the cabinet along the X-axis, which is beneficial for merging cabinets along the Y-axis.

[0022] In the fourth technical solution and its preferred embodiment, the protective cover is installed at the air inlet and fixed to the first side wall. The bottom of the protective cover is provided with an air inlet. Compared with the side or top of the protective cover being provided with an air inlet, it is more effective in preventing wind, sand, rain and snow from entering the first air duct through the air inlet, thus improving the protection.

[0023] In the fifth technical solution and its preferred embodiment, a filter element extending obliquely from bottom to top away from the first sidewall is also provided inside the protective cover near the air inlet. The filter element contains filter cotton, which is more conducive to preventing impurities such as wind, sand, rain, and snow from entering the air inlet. The oblique setting of the filter element can increase the area of ​​the filter element and the area of ​​the filter cotton, resulting in better filtration and protection effects. Compared with the filter element being obliquely from top to bottom away from the first sidewall, the oblique direction of the filter element is more conducive to increasing the area of ​​the separator when the height of the protective cover and the air inlet is constant, thereby increasing the area of ​​the filter cotton and further improving the filtration and protection effects. In addition, the filter cotton can also absorb the noise transmitted by the cooling fan through the air inlet, which plays a certain role in noise reduction and provides a better user experience.

[0024] In the sixth technical solution and its preferred embodiment, the cooling fan is placed in the first air duct. Compared with setting cooling fans separately in the second and third air ducts, it is more conducive to reducing the number of cooling fans and reducing costs. The power module extends vertically, and the third air duct includes a cooling air duct that extends vertically. The power module is attached to the outer wall of the cooling air duct. The cooling air duct has low wind resistance, high heat dissipation efficiency, and is more conducive to the power module and the second air duct avoiding other electrical components in the electrical cabinet.

[0025] In the seventh technical solution and its preferred embodiment, the power module includes a plurality of power units arranged at intervals along the Y-axis, extending vertically and parallel to the X-axis. The heat dissipation duct includes heat dissipation sub-ducts equal in number and corresponding one-to-one with the power units. Each heat dissipation sub-duct is arranged along the Y-axis and connected to the first duct in the vertical direction. Each power unit is attached to the outer wall of the heat dissipation sub-duct. Compared with the arrangement of each power unit and each heat dissipation sub-duct along the X-axis, this arrangement is more conducive to ensuring that the air volume of each heat dissipation sub-duct is similar, thereby making the heat dissipation of each power unit balanced. Furthermore, gaps are formed between adjacent heat dissipation sub-ducts, and between power units and adjacent heat dissipation sub-ducts, avoiding heat concentration. Each power unit is attached to the outer wall of the heat dissipation sub-duct, resulting in high heat dissipation efficiency for each power unit. This design ensures that the power module and heat dissipation duct mainly occupy space in the Y-axis direction, and at least one side of the power module along the X-axis direction can be used to place other electrical components, which is more conducive to the layout of electrical components in the electrical cabinet.

[0026] In the eighth technical solution and its preferred embodiment, a heat dissipation wall perpendicular to the Y-axis is provided on the first side of the heat dissipation sub-duct along the Y-axis direction, and the power unit is attached to and fixed to the outer surface of the heat dissipation wall; the heat dissipation sub-duct is provided with a number of heat dissipation fins spaced apart along the X-axis direction and extending vertically; the heat dissipation fins protrude from the inner surface of the heat dissipation wall, which on the one hand facilitates the transfer of heat from the power unit to the heat dissipation fins through the heat dissipation wall, increases the heat exchange area and thus improves the heat dissipation efficiency of the power unit; on the other hand, the structure of the heat dissipation wall and the heat dissipation fins is in the form of a radiator, and in the actual installation process, the power unit can be fixed to the heat dissipation wall, and then the heat dissipation wall and the duct plate can be installed to form the heat dissipation sub-duct, which makes the installation more convenient.

[0027] In the ninth technical solution and its preferred embodiment, the arrangement of multiple first sub-air ducts, compared to merging multiple first sub-air ducts into a single sub-first air duct, reduces the air resistance from the air inlet to each heat dissipation sub-air duct and from the air inlet to the second air duct. This facilitates the direct entry of airflow from the air inlet into the heat dissipation sub-air duct and the second air duct, thereby further improving heat dissipation efficiency. The first and second air passages are located on the upper and lower surfaces of the first sub-air ducts, respectively. Compared to having both the first and second air passages located on the sides of each first sub-air duct, this reduces the space occupied by each air duct within the cabinet and is also more convenient for installation. Since the reactor has better heat resistance than the power unit, the air passage area of ​​the second air passage is smaller than that of the first air passage, which is more conducive to extending the lifespan of the power unit.

[0028] In the tenth technical solution and its preferred embodiment, the setting of the air guide wall helps to reduce wind resistance, thereby making it easier for hot air to be discharged from the second air outlet. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of prior art 2;

[0031] Figure 2 This is a schematic diagram of the electrical cabinet in an embodiment of this application. Figure 1 ;

[0032] Figure 3 This is a schematic diagram of the electrical cabinet in an embodiment of this application. Figure 2 ;

[0033] Figure 4 This is a front view of the electrical cabinet according to an embodiment of this application;

[0034] Figure 5 for Figure 4 Sectional view along the AA direction;

[0035] Figure 6 This is a side view of an embodiment of this application;

[0036] Figure 7 for Figure 6 Sectional view in the BB direction;

[0037] Figure 8 This is a schematic diagram of the first air duct, the second air duct, and the third air duct in an embodiment of this application;

[0038] Figure 9 This is a schematic diagram of the first sub-duct of this application embodiment. Figure 1 ;

[0039] Figure 10 This is a schematic diagram of the first sub-duct of this application embodiment. Figure 2 .

[0040] Explanation of key figure labels:

[0041] Cabinet 10; First side wall 11; Air inlet 111; Second side wall 12; First air outlet 121; Second air outlet 122; First air duct 13; First sub-air duct 131; First air passage 1311; Second air passage 1312; Air inlet duct 132; Second air duct 14; Third air duct 15; Heat dissipation air duct 151; Heat dissipation sub-air duct 1511; Heat dissipation wall 1512; Heat sink 1513; First wall 1514; Third sub-air duct 152; Air guide wall 1521; Heat dissipation fan 20; Protective cover 30; Filter 31; Air inlet 32; Reactor 40; Power module 50; Power unit 51; Air-cooled heat exchanger 60. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0043] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0044] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0045] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall 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 through other devices or components.

[0046] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0047] In the claims and the description other than the embodiments, the terms "X-axis direction," "Y-axis direction," and "vertical 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 "vertical direction" described in the embodiments. In the embodiments, the X-axis direction is perpendicular to both the Y-axis direction and the vertical direction. Exemplarily, the X-axis direction can be divided into left and right, the Y-axis direction can be divided into front and back, and the vertical direction can be divided into up and down.

[0048] See Figure 2-7 , Figure 2-7 An electrical cabinet is shown, including a cabinet body 10, a cooling fan 20, a protective cover 30, a reactor 40, a power module 50, and an air-cooled heat exchanger 60. In practical applications, the electrical cabinet may also include other electrical components such as capacitor modules, DC electrical components, and AC electrical components.

[0049] See Figure 2-3 , Figure 2 and Figure 3 The three-dimensional views of the electrical cabinet from different perspectives are shown respectively. The cabinet 10 is in the shape of a cuboid, with its length direction in the X-axis direction, its width direction in the Y-axis direction, and its height direction in the Z-axis direction. 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 direction.

[0050] See Figure 4-5 , Figure 4 A front view of the electrical cabinet is shown. Figure 5 A cross-sectional view of the electrical cabinet is shown. The cabinet body 10 contains a first air duct 13, a second air duct 14, and a third air duct 15. Both the second air duct 14 and the third air duct 15 are connected to the first air duct 13. The first air duct 13, the second air duct 14, and the third air duct 15 are respectively provided with an air inlet 111, a first air outlet 121, and a second air outlet 122 that communicate with the outside. The air inlet 111 is located on the first side wall 11, and the first air outlet 121 and the second air outlet 122 are both located on the second side wall 12. Preferably, in this embodiment, the air inlet 111 is located in the middle of the cabinet body 10 in the height direction, and the first air outlet 121 and the second air outlet 122 are located at the bottom and top of the cabinet body 10, respectively. It should be understood that the air inlet 111, the first air outlet 121, and the second air outlet 122 may also have other positional relationships. For example, the air inlet 111 is located at the top of the cabinet 10 in the height direction, and the first air outlet 121 and the second air outlet 122 are located at the bottom and top of the cabinet 10, respectively. Alternatively, the air inlet 111 is located in the middle of the cabinet 10 in the height direction, and the first air outlet 121 and the second air outlet 122 are located at the bottom and middle of the cabinet 10, respectively.

[0051] See also Figure 6-8 , Figure 6 A front view of the electrical cabinet is shown. Figure 7 A cross-sectional view of the electrical cabinet is shown. Figure 8 A three-dimensional schematic diagram of each air duct is shown. The first air duct 13 has several first sub-air ducts 131 arranged along the Y-axis and an air inlet duct 132 connecting each first sub-air duct 131 and the air inlet 111. In this embodiment, the first sub-air duct 131 is cuboid in shape. See [reference needed] Figure 9-10 , Figure 9 and Figure 10 The diagram shows perspective views of each of the first sub-air ducts 131 from different angles. The upper and lower surfaces of each first sub-air duct 131 are respectively provided with a first air passage 1311 and a second air passage 1312. In this embodiment, the air passage area of ​​the second air passage 1312 is smaller than that of the first air passage 1311. The first air passage 1311 can be used to connect to the corresponding heat dissipation sub-air duct 1511 (described below), while the second air passage 1312 is used to connect to the second air duct 14. The airflow of the second air duct 14 and the third air duct 15 can be adjusted by adjusting the areas of the first air passage 1311 and the second air passage 1312. (See also...) Figure 5A cooling fan 20 is placed inside the first air duct 13 and is used to drive air from the air inlet 111 to the first air outlet 121 and the second air outlet 122 respectively. In this embodiment, the cooling fan 20 is installed at the air inlet 111 and located inside the air inlet duct 132. It should be understood that in other embodiments, a cooling fan 20 may also be installed in the second air duct 14 and the third air duct 15 respectively. To improve protection, a protective cover 30 is installed at the air inlet 111 and fixed to the first side wall 11. The bottom end of the protective cover 30 is provided with an air inlet 32. Inside the protective cover 30, near the air inlet 32, there is also a filter element 31 that extends obliquely from bottom to top away from the first side wall 11. The filter element 31 is provided with filter cotton.

[0052] See Figure 5 In this embodiment, the second air duct 14 is partly in the form of a cover for the reactor 40. The second air duct 14 is located below the first air duct 13, and its top end is connected to the second air outlet 1312. The reactor 40 is placed inside the second air duct 14. The second air duct 14 is also partially formed between the sealing plates at the bottom of the cabinet 10.

[0053] The third air duct 15 is used for heat dissipation of the power module 50. The power module 50 is attached to the outer wall of the third air duct 15. The arrangement of the third air duct 15 is related to the layout of the power module 50. The structure of the power module 50 is described below. Figure 7 The power module 50 extends vertically; the third air duct 15 includes a heat dissipation air duct 151 extending vertically, and the power module 50 abuts against the outer wall of the heat dissipation air duct 151. Specifically, the power module 50 includes a plurality of power units 51 arranged at intervals along the Y-axis, extending vertically and parallel to the X-axis. For example, the power unit 51 is an inverter IGBT power module; see also Figure 5 The heat dissipation duct 151 includes heat dissipation sub-ducts 1511, which are equal in number and correspond one-to-one with the power units 51, and a third sub-duct 152 extending along the X-axis direction and connected to each heat dissipation sub-duct 1511 in the vertical direction. Each heat dissipation sub-duct 1511 is arranged along the Y-axis direction and connected to the first duct 13 in the vertical direction. In this embodiment, the heat dissipation sub-duct 1511 is in the form of a cuboid. Each heat dissipation sub-duct 1511 is equal in number and connected to each first sub-duct 131. That is, the first duct 13 is provided with first sub-ducts 131, which are equal in number and correspond one-to-one with each heat dissipation sub-duct 1511. The upper surface of the first sub-duct 131 is provided with a first air outlet 1311 that is connected to the corresponding heat dissipation sub-duct 1511. Figure 7In this design, the heat dissipation sub-duct 1511 has a heat dissipation wall 1512 perpendicular to the Y-axis on its first side and a first wall 1514 perpendicular to the Y-axis on its second side. Power units 51 are attached to and fixed to the outer surface of the heat dissipation wall 1512; that is, each power unit 51 is attached to the outer wall of its respective heat dissipation sub-duct 1511. (See also...) Figure 5 and Figure 7 The heat dissipation sub-duct 1511 is provided with a number of heat dissipation fins 1513 arranged at intervals along the X-axis and extending vertically; the heat dissipation fins 1513 protrude from the inner surface of the heat dissipation wall 1512. The third sub-duct 152 is provided with a guide wall 1521 that extends obliquely from top to bottom toward the bottom end of the second air outlet 122.

[0054] See Figure 5 The air-cooled heat exchanger 60 is installed on the first side wall 11. It has an internal circulation air duct and an external circulation air duct for heat exchange between each other. The external circulation air duct is connected to the outside of the cabinet 10. The internal circulation air duct has an air supply port and an air return port. The air supply port faces the power module 50.

[0055] When the electrical cabinet is working normally, the heat from the power unit 51 is transferred through the heat dissipation wall 1512 to the heat sink 1513 in the heat dissipation sub-duct 1511. The cooling fan 20 drives the air from the protective cover 30 and the air inlet duct 132 into each of the first sub-ducts 131, and then through the first air outlet 1311 into the corresponding heat dissipation sub-duct 1511 to remove the heat transferred by the power unit 51. Then the hot air from each of the heat dissipation sub-ducts 1511 converges into the third sub-duct 152 and is discharged through the second air outlet 122 under the guidance of the air guide wall 1521. The cooling fan 20 also drives the air from the protective cover 30 and the air inlet duct 132 into each of the first sub-ducts 131 and then through the second air outlet 1312 into the second air duct 14 to remove the heat from the reactor 40. The hot air is discharged through the first air outlet 121 at the bottom. In addition, the cold air in the internal circulation duct of the air-cooled heat exchanger 60 also circulates inside the cabinet 10 to prevent the internal temperature of the electrical cabinet from getting too high.

[0056] In this embodiment, since the reactor 40 is placed inside the first air duct 13 and the power module 50 is attached to the outer wall of the second air duct 14, both the reactor 40 and the power module 50 are cooled by independent air ducts, resulting in higher heat dissipation efficiency compared to the power module 50 in the prior art. Because the second air duct 14 and the third air duct 15 share a single first air duct 13, the overall space occupied by each air duct is smaller than that in the prior art, allowing for a smaller cabinet 10. Furthermore, the shared first air duct 13 results in a shorter air path, requiring only one air inlet 111 on the cabinet 10, which is more conducive to manufacturing and requires fewer air duct plates, leading to lower costs. The power module 50 is attached to the outer wall of the third air duct 15, allowing it to be indirectly cooled by airflow through the third air duct 15, while also ensuring the protection of the power module 50.

[0057] In this embodiment, the air inlet 111 is located in the middle of the cabinet 10 in the height direction, that is, the first air inlet 111 is far from the ground. The airflow entering the first air inlet 111 has a low inlet temperature, and the heat dissipation efficiency of the reactor 40 and the power module 50 is high. The first air outlet 121 and the second air outlet 122 are located at the bottom and top of the cabinet 10, respectively. Combined with the fact that the air inlet 111 is located in the middle of the cabinet 10 in the height direction, on the one hand, it is beneficial for the second air duct 14 and the third air duct 15 to be far away from each other and not interfere with each other, avoiding heat radiation caused by close proximity. On the one hand, the concentration of energy is beneficial to the placement of the reactor 40 and the power module 50 above and below the cabinet 10, respectively. This allows for the setting of a high protection area above the cabinet 10 and a low protection area below the cabinet 10, reducing the possibility of a decrease in protection level due to seal failure. It also allows the reactor 40 to be located at the bottom of the cabinet 10. Since the reactor 40 is generally a large and heavy module, placing the reactor 40 at the bottom of the cabinet 10 can make reasonable use of the load-bearing structure of the entire cabinet 10 and increase the stability of the reactor 40 inside the electrical cabinet.

[0058] In this embodiment, the air inlet 111 is located on the first side wall 11, and the first air outlet 121 and the second air outlet 122 are both located on the second side wall 12. This arrangement keeps the air inlet 111 away from the first air outlet 121 and the second air outlet 122, making it difficult for hot air to flow into the air inlet 111 and preventing short-circuiting of the hot airflow. Furthermore, this arrangement positions the air inlet and outlet surfaces of the cabinet 10 on opposite sides along the X-axis, which is beneficial for merging the cabinets along the Y-axis.

[0059] In this embodiment, the protective cover 30 is installed at the air inlet 111 and fixed to the first side wall 11. The bottom end of the protective cover 30 is provided with an air inlet 32. Compared with the side or top of the protective cover 30 being provided with an air inlet 32, it is more effective in preventing wind, sand, rain and snow from entering the first air duct 13 through the air inlet 111, thus improving the protection.

[0060] In this embodiment, a filter element 31 extending obliquely from bottom to top away from the first sidewall 11 is also provided inside the protective cover 30 near the air inlet 32. The filter element 31 contains filter cotton, which is more conducive to preventing impurities such as wind, sand, rain and snow from entering the air inlet 111. The oblique setting of the filter element 31 can increase the area of ​​the filter element 31 and the area of ​​the filter cotton, resulting in better filtration and protection effects. Compared with the filter element 31 being oblique from top to bottom away from the first sidewall 11, the oblique direction of the filter element 31 is more conducive to increasing the area of ​​the filter element 31 under the condition that the height of the protective cover 30 and the air inlet 111 is constant, thereby increasing the area of ​​the filter cotton and further improving the filtration and protection effects. In addition, the filter cotton can also absorb the noise transmitted by the cooling fan 20 through the air inlet 111, which plays a certain role in noise reduction and provides a better user experience.

[0061] In this embodiment, the cooling fan 20 is placed inside the first air duct 13. Compared with setting the cooling fan 20 separately in the second air duct 14 and the third air duct 15, it is more conducive to reducing the number of cooling fans 20 and reducing costs. The power module 50 extends in the vertical direction. The third air duct 15 includes a cooling air duct 151 extending in the vertical direction. The power module 50 is attached to the outer wall of the cooling air duct 151. The cooling air duct 151 has low wind resistance, high heat dissipation efficiency, and is more conducive to the power module 50 and the second air duct 14 avoiding other electrical components in the electrical cabinet.

[0062] In this embodiment, the power module 50 includes a plurality of power units 51 arranged at intervals along the Y-axis, extending vertically and parallel to the X-axis. The heat dissipation duct 151 includes heat dissipation sub-ducts 1511, which are equal in number and correspond one-to-one with the power units 51. Each heat dissipation sub-duct 1511 is arranged along the Y-axis and communicates with the air inlet duct 132 in the vertical direction. Each power unit 51 is respectively attached to the outer wall of the heat dissipation sub-duct 1511. Compared with the arrangement of each power unit 51 and each heat dissipation sub-duct 1511 along the X-axis, this arrangement is more conducive to ensuring the heat dissipation sub-duct 1511 is properly positioned. With similar airflow, the heat dissipation of each power unit 51 is balanced, and gaps are formed between adjacent heat dissipation sub-ducts 1511, thus avoiding heat concentration. Each power unit 51 is attached to the outer wall of the heat dissipation sub-duct 1511, and each power unit 51 has high heat dissipation efficiency. This design ensures that the power module 50 and the heat dissipation duct 151 mainly occupy space in the Y-axis direction, and at least one side of the power module 50 along the X-axis direction can be used to place other electrical components, which is more conducive to the layout of electrical components in the electrical cabinet.

[0063] In this embodiment, the heat dissipation sub-duct 1511 has a heat dissipation wall 1512 perpendicular to the Y-axis on its first side along the Y-axis direction. The power unit 51 is attached to and fixed to the outer surface of the heat dissipation wall 1512. The heat dissipation sub-duct 1511 is provided with a plurality of heat dissipation fins 1513 spaced apart along the X-axis direction and extending vertically. The heat dissipation fins 1513 protrude from the inner surface of the heat dissipation wall 1512. On the one hand, this facilitates the transfer of heat from the power unit 51 to the heat dissipation fins 1513 through the heat dissipation wall 1512, increasing the heat exchange area and thus improving the heat dissipation efficiency of the power unit 51. On the other hand, the structure of the heat dissipation wall 1512 and the heat dissipation fins 1513 is in the form of a radiator. In actual installation, the power unit 51 can be fixed to the heat dissipation wall 1512, and then the heat dissipation wall 1512 and the duct plate can be installed to form the heat dissipation sub-duct 1511, making the installation more convenient.

[0064] In this embodiment, the arrangement of multiple first sub-air ducts 131, compared to merging multiple first sub-air ducts 131 into a single sub-first air duct 13, reduces the air resistance from the air inlet 111 to each heat dissipation sub-air duct 1511 and from the air inlet 111 to the second air duct 14. This facilitates the direct entry of airflow from the air inlet 111 into the heat dissipation sub-air duct 1511 and the second air duct 14, thereby further improving heat dissipation efficiency. The first air outlet 1311 and the second air outlet 1312 are located on the upper and lower surfaces of the first sub-air duct 131, respectively. Compared to having both the first air outlet 1311 and the second air outlet 1312 located on the sides of each first sub-air duct 131, this arrangement is more conducive to reducing the space occupied by each air duct within the cabinet 10 and is also more convenient for installation. Since the reactor 40 has better heat resistance than the power unit 51, the air passage area of ​​the second air passage 1312 is smaller than that of the first air passage 1311, which is more conducive to extending the life of the power unit 51.

[0065] In this embodiment, the wind guide wall 1521 helps to reduce wind resistance, thereby making it easier for hot air to be discharged from the second air outlet 122.

[0066] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. An electrical cabinet, characterized in that include The cabinet (10) forms a first air duct (13), a second air duct (14) and a third air duct (15) inside. The second air duct (14) and the third air duct (15) are both connected to the first air duct (13). The first air duct (13), the second air duct (14) and the third air duct (15) are respectively provided with an air inlet (111), a first air outlet (121) and a second air outlet (122) connected to the outside. A cooling fan (20) is used to drive air from the air inlet (111) to the first air outlet (121) and the second air outlet (122); The reactor (40) is placed inside the second air duct (14); and The power module (50) is attached to the outer wall of the third air duct (15).

2. An electrical cabinet as claimed in claim 1, characterised in that The air inlet (111) is located in the middle of the cabinet (10) in the height direction, and the first air outlet (121) and the second air outlet (122) are located at the bottom and top of the cabinet (10) respectively.

3. An electrical cabinet as claimed in claim 2, characterised in that, The cabinet (10) is provided with a first side wall (11) and a second side wall (12) that are arranged along the X-axis and extend vertically opposite each other. The air inlet (111) is opened on the first side wall (11), and the first air outlet (121) and the second air outlet (122) are both opened on the second side wall (12).

4. An electrical cabinet as described in claim 3, characterized in that, It also includes a protective cover (30); the protective cover (30) is installed at the air inlet (111) and fixed to the first side wall (11), and the bottom end of the protective cover (30) is provided with an air inlet (32).

5. An electrical cabinet as described in claim 4, characterized in that, Inside the protective cover (30), near the air inlet (32), there is a filter element (31) that extends obliquely from bottom to top away from the first side wall (11), and the filter element (31) is provided with filter cotton.

6. An electrical cabinet as described in any one of claims 3-5, characterized in that, The cooling fan (20) is placed inside the first air duct (13); the power module (50) extends in the vertical direction; the third air duct (15) includes a cooling air duct (151) extending in the vertical direction, and the power module (50) is attached to the outer wall of the cooling air duct (151).

7. An electrical cabinet as described in claim 6, characterized in that, The power module (50) includes several power units (51) that are spaced apart along the Y-axis, extend vertically, and are parallel to the X-axis. The heat dissipation duct (151) includes heat dissipation sub-ducts (1511) that are equal in number to and correspond one-to-one with the power units (51). Each heat dissipation sub-duct (1511) is arranged along the Y-axis and connected to the first duct (13) in the vertical direction. Each power unit (51) is attached to the outer wall of the duct of each heat dissipation sub-duct (1511).

8. An electrical cabinet as described in claim 7, characterized in that, The heat dissipation sub-duct (1511) has a heat dissipation wall (1512) perpendicular to the Y-axis on its first side along the Y-axis direction. The power unit (51) is attached to and fixed to the outer surface of the heat dissipation wall (1512). The heat dissipation sub-duct (1511) is provided with a plurality of heat dissipation fins (1513) spaced apart along the X-axis direction and extending vertically. The heat dissipation fins (1513) protrude from the inner surface of the heat dissipation wall (1512).

9. An electrical cabinet as described in claim 7, characterized in that, The first air duct (13) is provided with a number of first sub-air ducts (131) that are equal to and correspond one-to-one with each heat dissipation sub-air duct (1511) and an air inlet duct (132) that connects each first sub-air duct (131) and an air inlet (111). The upper surface of the first sub-air duct (131) is provided with a first air outlet (1311) that connects to the corresponding heat dissipation sub-air duct (1511). The lower surface of the first sub-air duct (131) is provided with a second air outlet (1312) that connects to the second air duct (14). The air passage area of ​​the second air outlet (1312) is smaller than the air passage area of ​​the first air outlet (1311).

10. An electrical cabinet as described in claim 7, characterized in that, The third air duct (15) is also provided with a third sub-air duct (152) that is vertically connected to each heat dissipation sub-air duct (1511) and extends along the X-axis. The third sub-air duct (152) is provided with a guide wall (1521) that extends obliquely from top to bottom toward the bottom of the second air outlet (122).

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