An electrical cabinet

Abstract

The application provides an electrical cabinet, and belongs to the technical field of electrical equipment, which comprises a cabinet body, a first heat exchange structure, a second heat exchange structure and a component group. The cabinet body has a closed cavity; the first heat exchange structure is arranged on the upper half of the back side plate of the cabinet body; the first heat exchange structure has a first internal circulation air outlet and a first internal circulation air return port; the second heat exchange structure is arranged on the lower half of the front side plate of the cabinet body; the component group comprises a high heat generating component, a first low heat generating component and a second low heat generating component; the high heat generating component is located in the upper half of the closed cavity, the first low heat generating component is located in the lower back half of the closed cavity, and the second low heat generating component is located in the lower front half of the closed cavity. The electrical cabinet provided by the application is characterized in that the first heat exchange structure and the second heat exchange structure are arranged in an up-and-down staggered mode, and the hot air flowing through the first low heat generating component and the second low heat generating component can also enter the second heat exchange structure for heat exchange, thereby solving the problem of local hot spots.

Description

Technical Field

[0001] This invention belongs to the field of electrical equipment technology, and more specifically, relates to an electrical cabinet. Background Technology

[0002] Electrical cabinets for photovoltaic inverters, energy storage converters, and similar devices typically contain power components such as inverter modules, reactor modules, and capacitor busbar modules. Because these electrical cabinets are often used in harsh environments with high temperatures, high humidity, and high dust levels, they require high sealing performance and a high protection rating to protect the internal power components. Therefore, enclosed heat dissipation is the only option for these cabinets.

[0003] Because the interior of the electrical cabinet is a closed space, the heat dissipation effect is poor, especially for electrical cabinets with large spaces, which may also cause local hot spots. Summary of the Invention

[0004] The purpose of this invention is to provide an electrical cabinet and an electrical cabinet that solves the problems of poor heat dissipation and local hot spots in the existing enclosed electrical cabinets.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide an electrical cabinet, comprising:

[0006] The cabinet has a closed cavity;

[0007] A first heat exchange structure is disposed on the upper half of the rear side panel of the cabinet; the first heat exchange structure has a first internal circulation air outlet and a first internal circulation air return outlet facing the enclosed cavity respectively; the first internal circulation air outlet is located below the first internal circulation air return outlet.

[0008] The second heat exchange structure is located in the lower half of the front panel of the cabinet;

[0009] The component group includes a high-heat-generating device, a first low-heat-generating device, and a second low-heat-generating device; the high-heat-generating device is located in the upper half of the enclosed cavity, the first low-heat-generating device is located in the lower rear half of the enclosed cavity, and the second low-heat-generating device is located in the lower front half of the enclosed cavity;

[0010] In this process, a portion of the cold air output from the first internal circulation air outlet flows forward through the high-heat-generating device and returns to the first internal circulation return air outlet for heat exchange, while a portion of the cold air flows downward sequentially through the first low-heat-generating device and the second low-heat-generating device, and then enters the second heat exchange structure for heat exchange.

[0011] In one possible implementation, the first heat exchange structure is a first heat exchanger, and the second heat exchange structure is a second heat exchanger;

[0012] The second heat exchanger has a second internal circulation air outlet and a second internal circulation air return outlet facing the enclosed cavity respectively; the second internal circulation air outlet is located below the second internal circulation air return outlet;

[0013] In this process, a portion of the cold air output from the first internal circulation outlet flows forward through the high-heat-generating device and returns to the first internal circulation return air inlet, while a portion of the cold air flows downward through the first low-heat-generating device and flows to the second internal circulation return air inlet; the cold air output from the second internal circulation outlet flows through the second low-heat-generating device and returns to the second internal circulation return air inlet for heat exchange.

[0014] In some embodiments, a first fan is provided at the first internal circulation air outlet, with the air outlet side of the first fan facing the front panel of the cabinet; a second fan is provided at the second internal circulation air outlet, with the second fan facing the lower panel of the cabinet;

[0015] The first heat exchanger has a first heat exchange core, and the second heat exchanger has a second heat exchange core, wherein the heat exchange volume of the first heat exchange core is greater than the heat exchange volume of the second heat exchange core.

[0016] In one possible implementation, the first heat exchange structure is a first heat exchanger; the inner side of the front panel of the cabinet is provided with a sealing plate, and the second heat exchange structure is a vertical channel formed by the sealing plate and the front panel of the cabinet;

[0017] The air inlet of the vertical channel faces the second low-heat device, and the air outlet faces the upper front half of the enclosed cavity; a fifth fan is provided at the air inlet of the vertical channel;

[0018] A portion of the cold air output from the first internal circulation air outlet flows downwards sequentially through the first low-heating device and the second low-heating device, and enters the vertical channel, where it exchanges heat through the front panel of the cabinet.

[0019] In one possible implementation, the lower half of the enclosed cavity is provided with a first ventilation duct, which is located between the first low-heating device and the second low-heating device; the component group also includes a low-protection module disposed in the first ventilation duct.

[0020] The air inlet of the first ventilation duct is located on the lower side panel of the cabinet, and the air outlet of the first ventilation duct is located on the front side panel of the cabinet; the second heat exchange structure is located below the air outlet of the first ventilation duct.

[0021] In one possible implementation, the upper half of the enclosed cavity is provided with a flow channel, the flow channel having an air inlet facing the first internal circulation air outlet, a first air outlet facing the lower side panel of the cabinet, and a second air outlet facing the front side panel of the cabinet.

[0022] In some embodiments, the high-heat-generating devices are distributed in multiple phases at intervals along the left-right direction of the cabinet, and each phase of the high-heat-generating device is attached to a heat sink.

[0023] The enclosed cavity is also provided with multiple sets of second ventilation ducts that correspond one-to-one with the radiator, and the radiator is located in the corresponding second ventilation duct; the flow passage is formed between each pair of adjacent sets of second ventilation ducts.

[0024] The lower end of the second ventilation duct extends below the high-heat-generating device, and the extended end of the second ventilation duct forms the first air outlet and the second air outlet.

[0025] In some embodiments, the enclosed cavity is further provided with a main air inlet duct, which is connected to the air inlets of each of the second ventilation ducts; the air inlet of the main air inlet duct is opened on the rear side panel of the cabinet; the first heat exchange structure is located above the air inlet of the main air inlet duct.

[0026] In some embodiments, the component group further includes a third low-heating device and a fourth low-heating device disposed in the upper half of the enclosed cavity, wherein the third low-heating device is in contact with the front end face of the high-heating device, and the fourth low-heating device is located in front of the third low-heating device.

[0027] A third fan is provided behind the second air outlet in the enclosed cavity. The third fan is located below and behind the third low-heat device, with its air inlet side facing the second air outlet and its air outlet side facing the third low-heat device and the fourth low-heat device.

[0028] In some embodiments, a fourth fan is provided above the third low-heat device inside the enclosed cavity, and the air outlet side of the fourth fan faces the first internal circulation return air port.

[0029] The fourth fan is used to draw hot air that has passed through the third and fourth low-heat devices and deliver it to the first internal circulation return air inlet.

[0030] The electrical cabinet provided by this invention has the following advantages compared with the prior art:

[0031] Placing the component assembly in a closed cavity can meet the requirements of high sealing performance and high protection level of the cabinet.

[0032] The high-heat-generating device is located in the upper half of the enclosed cavity, while the first low-heat-generating device and the second low-heat-generating device are located in the lower half of the enclosed cavity. This optimizes the spatial layout of the enclosed cavity, making it easier to achieve electrical connection of the component group and optimize the cable layout.

[0033] The first heat exchange structure corresponds to the high-heat-generating device. The cold air output from the first internal circulation outlet can flow through the high-heat-generating device to dissipate heat, and it can also flow through the first low-heat-generating device and the second low-heat-generating device to dissipate heat from both of them, thereby improving the heat dissipation effect of the closed cavity. Moreover, the first heat exchange structure and the second heat exchange structure are arranged in an alternating manner, so that the hot air flowing through the first low-heat-generating device and the second low-heat-generating device can also enter the second heat exchange structure for heat exchange, thereby avoiding the high temperature in the front half of the closed cavity and solving the problem of local hot spots. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic diagram of the structure of an electrical cabinet provided in one embodiment of the present invention. Figure 1 (The left side panel of the cabinet is not shown in the picture);

[0036] Figure 2 for Figure 1 Rear view (the right side panel of the cabinet is not shown in the figure; the arrows indicate the direction of airflow circulation within the enclosed cavity).

[0037] Figure 3 for Figure 1 The provided electrical cabinet structural diagram Figure 2 (The left side panel of the cabinet is not shown in the picture);

[0038] Figure 4 for Figure 1 The provided electrical cabinet structural diagram Figure 3 (The left side panel of the cabinet and the left side panel of the second air duct are not shown in the picture.)

[0039] Figure 5 A schematic diagram of the structure of an electrical cabinet provided for another embodiment of the present invention (the right side panel of the cabinet is not shown in the figure, and the arrows indicate the direction of airflow circulation within the enclosed cavity).

[0040] In the picture:

[0041] 1. Cabinet; 11. Enclosed cavity; 12. First ventilation duct; 13. Second ventilation duct; 14. Flow channel; 141. First air outlet; 142. Second air outlet; 15. Main air inlet duct; 16. Air guide hood; 17. Sealing plate; 18. Vertical channel;

[0042] 2. First heat exchange structure; 21. First internal circulation air outlet; 22. First internal circulation air return outlet; 23. First external circulation air inlet; 24. First external circulation air outlet;

[0043] 3. Second heat exchange structure; 31. Second internal circulation air outlet; 32. Second internal circulation air return outlet; 33. Second external circulation air inlet; 34. Second external circulation air outlet;

[0044] 41. High-heat-generating device; 42. First low-heat-generating device; 43. Second low-heat-generating device; 44. Third low-heat-generating device; 45. Fourth low-heat-generating device; 46. Low-protection module;

[0045] 51. First fan; 53. Third fan; 54. Fourth fan; 55. Fifth fan. Detailed Implementation

[0046] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0047] Please refer to the following: Figures 1 to 5 The electrical cabinet provided by the present invention will now be described. The electrical cabinet includes a cabinet body 1, a first heat exchange structure 2, a second heat exchange structure 3, and a component assembly. The cabinet body 1 has a closed cavity 11; the first heat exchange structure 2 is disposed in the upper half of the rear side panel of the cabinet body 1; the first heat exchange structure 2 has a first internal circulation air outlet 21 and a first internal circulation air return outlet 22 facing the closed cavity 11 respectively; the first internal circulation air outlet 21 is located below the first internal circulation air return outlet 22; the second heat exchange structure 3 is disposed in the lower half of the front side panel of the cabinet body 1; the component assembly includes a high-heat-generating device 41, a first low-heat-generating device 42, and a second low-heat-generating device 43; the high-heat-generating device 41 is located in the upper half of the closed cavity 11, the first low-heat-generating device 42 is located in the lower rear half of the closed cavity 11, and the second low-heat-generating device 43 is located in the lower front half of the closed cavity 11.

[0048] In this process, a portion of the cold air output from the first internal circulation outlet 21 flows forward through the high-heat-generating device 41 and then flows back to the first internal circulation return air outlet 22 for heat exchange, while a portion of the cold air flows downward sequentially through the first low-heat-generating device 42 and the second low-heat-generating device 43, and then enters the second heat exchange structure 3 for heat exchange.

[0049] Cabinet 1 has a rectangular parallelepiped structure, consisting of a front panel, a rear panel, a left side panel, a top panel, a bottom panel, and a supporting frame connecting and supporting these panels. Cabinet 1 has a closed cavity 11, which can be understood as the six panels of cabinet 1 forming a closed cavity 11, or the six panels of cabinet 1 cooperating with other panels within cabinet 1 to form a closed cavity 11. The closed cavity 11 is not connected to the outside, thus giving it high sealing performance and a high protection level, enabling the electrical cabinet to be used in harsh environments such as high temperature, high humidity, and high dust, and meeting the usage requirements of the component assembly.

[0050] Since some of the cold air output from the first internal circulation outlet 21 flows forward through the high-heat-generating device 41, and some of the cold air flows downward and forward sequentially through the first low-heat-generating device 42 and the second low-heat-generating device 43, in order to increase the airflow path and to rationally allocate the placement of the component groups, the front-to-back direction of the cabinet 1 is the same as the length direction of the cabinet 1. The front and rear side panels of the cabinet 1 are perpendicular to the length direction. That is to say, the first heat exchange structure 2 and the second heat exchange structure 3 are respectively set on the two side panels perpendicular to the length direction of the cabinet 1.

[0051] In addition, the aforementioned limitations in the front, back, left, right, up, and down directions are based on the front door panel of cabinet 1 after installation. Generally, cabinet 1 is equipped with a front door panel (i.e., front side panel), which can be opened to allow maintenance of components. An operation panel is also installed on the front door panel.

[0052] The component assembly typically consists of high-protection-level electrical components that generate heat during operation. Specifically, the high-heat-generating component 41 generates a large amount of heat, therefore it is positioned in the upper half of the enclosed cavity 11, corresponding to the first heat exchange structure 2. The first low-heat-generating component 42 and the second low-heat-generating component 43 generate less heat, and based on the aerodynamic principle of cold air naturally sinking, they are positioned in the lower half of the enclosed cavity 11. The high-heat-generating component 41, the first low-heat-generating component 42, and the second low-heat-generating component 43 are electrically connected sequentially.

[0053] Since the inner cavity of cabinet 1 is a closed cavity 11 and the heat generated by the component group is large, the heat conduction of cabinet 1 itself cannot completely dissipate the heat. Therefore, a heat exchange structure needs to be set on cabinet 1, and the heat of the component group is carried away by airflow and exchanged through the heat exchange structure.

[0054] Specifically, the heat exchange structure includes a first heat exchange structure 2 and a second heat exchange structure 3. The first heat exchange structure 2 has only one first internal circulation air outlet 21 and one first internal circulation air return outlet 22. The airflow in the closed cavity 11 enters the heat exchanger through the first internal circulation air return outlet 22 for heat exchange and cooling, and then enters the closed cavity 11 through the first internal circulation air outlet 21. The second heat exchange structure 3 can both intake and exhaust air.

[0055] Since the first heat exchange structure 2 is located in the upper half of the rear panel of the cabinet 1 and the second heat exchange structure 3 is located in the lower half of the front panel of the cabinet 1, the first heat exchange structure 2 and the second heat exchange structure 3 are arranged alternately. According to the aerodynamic principle that hot air rises naturally and cold air sinks naturally, part of the cold air output from the first internal circulation air outlet 21 can flow forward through the high-heat-generating device 41 and flow upward back to the first internal circulation return air outlet 22 for heat dissipation, thereby dissipating heat from the high-heat-generating device 41. Part of the cold air can flow downward through the first low-heat-generating device 42 and the second low-heat-generating device 43 in sequence, and enter the second heat exchange structure 3 for heat exchange, thereby dissipating heat from the first low-heat-generating device 42 and the second low-heat-generating device 43. Cold air flows through all the component groups, thereby avoiding the problem of hot spots inside the cabinet 1.

[0056] Compared with the prior art, the electrical cabinet provided by the present invention places the component group in the closed cavity 11, which can meet the requirements of high sealing performance and high protection level of the cabinet.

[0057] The high-heat-generating device 41 is disposed in the upper half of the enclosed cavity 11, and the first low-heat-generating device 42 and the second low-heat-generating device 43 are disposed in the lower half of the enclosed cavity 11. This optimizes the spatial layout of the enclosed cavity 11, making it easier to achieve electrical connection of the component group and optimize the cable layout.

[0058] The first heat exchange structure 2 corresponds to the high-heat-generating device 41. The cold air output from the first internal circulation outlet 21 can flow through the high-heat-generating device 41 to dissipate heat, and can also flow through the first low-heat-generating device 42 and the second low-heat-generating device 43 to dissipate heat from both, thereby improving the heat dissipation effect of the closed cavity 11. Moreover, the first heat exchange structure 2 and the second heat exchange structure 3 are arranged in an alternating manner, so that the hot air flowing through the first low-heat-generating device 42 and the second low-heat-generating device 43 can also enter the second heat exchange structure 3 for heat exchange, thereby avoiding the high temperature in the lower front half of the closed cavity 11 and solving the problem of local hot spots.

[0059] In some embodiments, the first heat exchange structure 2 and the second heat exchange structure 3 described above can be adopted as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The first heat exchange structure 2 is a first heat exchanger, and the second heat exchange structure 3 is a second heat exchanger; the second heat exchanger has a second internal circulation air outlet 31 and a second internal circulation air return outlet 32 ​​facing the closed cavity 11 respectively; the second internal circulation air outlet 31 is located below the second internal circulation air return outlet 32.

[0060] Among them, part of the cold air output from the first internal circulation air outlet 21 flows forward through the high-heat-generating device 41 and flows back to the first internal circulation return air outlet 22, and part of the cold air flows downward through the first low-heat-generating device 42 and flows to the second internal circulation return air outlet 32; the cold air output from the second internal circulation air outlet 31 flows through the second low-heat-generating device 43 and flows back to the second internal circulation return air outlet 32 ​​for heat exchange.

[0061] The first heat exchanger is preferably an air-to-air heat exchanger, which has a first heat exchange core. It can introduce cold air from the outside and also recover hot air from the closed cavity 11. After passing through the first heat exchange core, the cold air from the outside carries away the heat from the hot air in the closed cavity 11, thereby reducing the temperature of the hot air. It should be noted that the cold air from the outside and the hot air circulating in the closed cavity 11 are separated and will not clash.

[0062] The first heat exchanger also has a first external circulation air inlet 23 and a first external circulation air outlet 24 facing the outside, with the first external circulation air inlet 23 located below the first external circulation air outlet 24.

[0063] Specifically, the circulating airflow within the enclosed cavity 11 enters the first heat exchanger through the first internal circulation return air inlet 22, and after being cooled by heat exchange in the first core, it enters the enclosed cavity 11 again through the first internal circulation outlet 21. The external airflow enters the first heat exchanger through the first external circulation inlet 23, carries away heat after passing through the first heat exchange core to lower the temperature of the first heat exchange core, and then flows out of the first heat exchanger through the first external circulation outlet 24.

[0064] The first internal circulation return air inlet 22 is located above the first internal circulation air outlet 21, conforming to the natural downward flow trend of cold air. The first external circulation air inlet 23 is located below the first external circulation air outlet 24, conforming to the natural upward flow trend of hot air.

[0065] The structure of the second heat exchanger is similar to that of the first heat exchanger, and it is also an air-to-air heat exchanger. The second heat exchanger has a second heat exchange core, a second internal circulation air outlet 31 and a second internal circulation air return outlet 32 ​​facing the closed cavity 11, and a second external circulation air inlet 33 and a second external circulation air outlet 34 facing the outside. The heat exchange principle of the second heat exchanger is the same as that of the first heat exchanger, and will not be described again here.

[0066] The first heat exchanger is used in conjunction with the second heat exchanger. For specific airflow patterns, please refer to [reference needed]. Figure 2According to the airflow trend of cold air naturally sinking and hot air naturally rising, part of the cold air output from the first internal circulation outlet 21 flows forward through the high-heat-generating device 41 and flows back upward and backward to the first internal circulation return air outlet 22, and part of the cold air flows downward and forward through the first low-heat-generating device 42 and flows to the second internal circulation return air outlet 32; the cold air output from the second internal circulation outlet 31 flows backward through the second low-heat-generating device 43 and flows back upward and forward to the second internal circulation return air outlet 32 ​​for heat exchange.

[0067] Since the second heat exchanger not only has a heat exchange effect, it can also output cold air to the lower half of the closed cavity 11 to dissipate heat from the second low-heat device 43. The second low-heat device 43 has cold air passing through it directly, thereby improving the heat dissipation effect and further avoiding high temperature in the lower front half of the closed cavity 11, thus solving the problem of local hot spots.

[0068] Since the second heat exchanger is mainly used to dissipate heat from the second low-heat-generating device 43, while the first heat exchanger needs to dissipate heat from the entire component assembly, the heat exchange efficiency of the first heat exchanger must be greater than that of the second heat exchanger. To increase the heat exchange efficiency of the first heat exchanger, based on the above implementation method, a first fan 51 is provided at the first internal circulation air outlet 21. The air outlet side of the first fan 51 faces the front panel of the cabinet 1. Figures 2 to 5 As shown; a second fan is provided at the second internal circulation air outlet 31, and the second fan faces the lower side panel of the cabinet 1; in addition, the first heat exchanger has a first heat exchange core, the second heat exchanger has a second heat exchange core, and the heat exchange volume of the first heat exchange core is greater than the heat exchange volume of the second heat exchange core.

[0069] The air outlet side of the first fan 51 faces the front panel of the cabinet 1. That is to say, the air outlet side of the first fan 51 faces the high-heat-generating device 41. The first fan 51 can increase the air outlet speed and air volume output from the first internal circulation air outlet 21 to the closed cavity 11, so that some cold air is directly directed to the high-heat-generating device 41, and some cold air is directed to the first low-heat-generating device 42 according to the natural downward flow trend of cold air.

[0070] The air outlet of the second fan faces the lower side panel of the cabinet 1, not the second low-heating device 43. The cold air output from the second internal circulation outlet 31 flows downward first and then is bounced back and flows backward through the second low-heating device 43. The airflow bounce can correspondingly slow down the flow speed of the cold air towards the second low-heating device 43, so as to avoid colliding with the airflow that passes through the first low-heating device 42 and flows forward.

[0071] Moreover, since the heat exchange volume of the first heat exchange core is larger than that of the second heat exchange core, the heat exchange efficiency of the first heat exchange core is greater than that of the second heat exchange core, thereby increasing the cold air output of the first heat exchanger.

[0072] In some embodiments, the first heat exchange structure 2 and the second heat exchange structure 3 described above may also employ, for example... Figure 5 The structure shown is described in the following document. Figure 5 The first heat exchange structure 2 is the first heat exchanger; the inner side of the front panel of the cabinet 1 is provided with a sealing plate 17, and the second heat exchange structure 3 is a vertical channel 18 formed by the sealing plate 17 and the front panel of the cabinet 1; the air inlet of the vertical channel 18 faces the second low-heating device 43, and the air outlet faces the upper front half of the closed cavity 11; a fifth fan 55 is provided at the air inlet of the vertical channel 18; part of the cold air output from the first internal circulation air outlet 21 flows downward through the first low-heating device 42 and the second low-heating device 43 in sequence, and enters the vertical channel 18, and exchanges heat through the front panel of the cabinet 1.

[0073] The sealing plate 17 is located behind the front side panel of the cabinet 1. With the help of the sealing plate 17 and the front side panel of the cabinet 1, a vertical channel 18 can be formed. The vertical channel 18 has air intake at the bottom and air outlet at the top, which conforms to the natural trend of hot air flowing upward.

[0074] Preferably, the fifth fan 55 is an exhaust fan. The fifth fan 55 exhausts air, creating a negative pressure in the lower half of the enclosed cavity 11 to increase the forward flow speed of the airflow. Moreover, the fifth fan 55 can also send part of the heated airflow into the vertical channel 18. Since the front panel of the cabinet 1 faces the outside directly, the airflow can transfer heat to the outside through the front panel when passing through the vertical channel 18, thereby improving the heat exchange efficiency and reducing the temperature of the lower front half of the enclosed cavity 11.

[0075] In addition, after the airflow is cooled by the vertical channel 18, it re-enters the enclosed cavity 11 from the air outlet of the vertical channel 18 and flows back to the first internal circulation return air inlet 22. Since the air outlet of the vertical channel 18 is located above the air inlet of the vertical channel 18, by reasonably determining the height of the air outlet of the vertical channel 18, the return air path can be changed, thereby allowing for reasonable heat dissipation based on the heat generation requirements of the electrical components in the upper part of the enclosed cavity 11.

[0076] In some embodiments, the above-mentioned electrical cabinet may also employ, for example... Figure 1 , Figure 3 and Figure 4 The structure shown is described in the following document. Figure 1 , Figure 3 and Figure 4 The lower half of the enclosed cavity 11 is provided with a first ventilation duct 12, which is located between the first low-heating device 42 and the second low-heating device 43; the component group also includes a low-protection module 46 disposed in the first ventilation duct 12.

[0077] The low protection module 46 is generally a large and heavy component that generates a lot of heat, but its protection requirements are not high. Therefore, it is not necessary to put the low protection module 46 into the closed cavity 11. Instead, the low protection module 46 is placed at the bottom of the cabinet 1 and covered with the first ventilation duct 12 to optimize the component layout in the lower half of the closed cavity 11 and make reasonable use of the load-bearing structure of the entire cabinet 1 to increase the stability of the low protection module 46 inside the cabinet 1.

[0078] Specifically, the air inlet of the first ventilation duct 12 is located on the lower side panel of the cabinet 1, and the air outlet of the first ventilation duct 12 is located on the front side panel of the cabinet 1; the second heat exchange structure 3 is located below the air outlet of the first ventilation duct 12.

[0079] The first ventilation duct 12 has air intake at the bottom and air outlet at the top, which conforms to the natural upward flow trend of hot air. In addition, the air outlet of the first ventilation duct 12 is located on the front side panel of the cabinet 1, and its upper horizontal part is far away from the high-heat-generating device 41 and the first low-heat-generating device 42, so as not to affect the electrical connection between the two, thus optimizing the spatial layout of the enclosed cavity 11.

[0080] In some embodiments, the aforementioned enclosed cavity 11 may also employ, for example... Figure 1 and Figure 3 The structure shown is described in the following document. Figure 1 and Figure 3 The upper half of the enclosed cavity 11 is provided with a flow channel 14. The flow channel 14 has an air inlet facing the first internal circulation air outlet 21, a first air outlet 141 facing the lower side panel of the cabinet 1, and a second air outlet 142 facing the front side panel of the cabinet 1.

[0081] The flow channel 14 extends along the front and rear direction of the cabinet 1, and its air inlet is completely aligned with the first internal circulation air outlet 21. All the cold air output from the first internal circulation air outlet 21 is collected in the flow channel 14, thereby preventing the airflow from being dispersed into the closed cavity 11 after being output from the first internal circulation air outlet 21, thus avoiding the loss of cold air.

[0082] The first air outlet 141 faces the lower side panel of the cabinet 1, that is, towards the first low-heating device 42. Some of the cold air accumulated in the airflow duct can be quickly dissipated to the first low-heating device 42 through the first air outlet 141. The second air outlet 142 faces the front side panel of the cabinet 1, that is, towards the top of the second low-heating device 43. Some of the cold air accumulated in the airflow duct can also be quickly dissipated to the second low-heating device 43 through the second air outlet 142.

[0083] Preferably, in order to increase the air volume and air velocity of the flow channel 14, at least two flow channels 14 can be distributed at intervals along the left and right directions of the cabinet 1.

[0084] It should be noted that the flow channel 14 is a spatial structure, which can be formed by multiple partitions set in the closed cavity 11, or by the ventilation duct or the second ventilation duct 13 in the closed cavity 11. This embodiment does not limit the specific structure of the flow channel 14, as long as the flow channel 14 extends along the front and rear direction of the cabinet 1 and can accumulate cold air.

[0085] In some embodiments, the high-heat-generating device 41 described above can be employed as follows: Figure 1 , Figure 3 and Figure 4 The structure shown is described in the following document. Figure 1 , Figure 3 and Figure 4 The high-heat-generating devices 41 are distributed in multiple phases along the left and right directions of the cabinet 1, and each phase of the high-heat-generating device 41 is attached to a heat sink; the enclosed cavity 11 is also provided with multiple sets of second ventilation ducts 13 corresponding to the heat sinks, and the heat sinks are located in the corresponding second ventilation ducts 13; the above-mentioned flow passage 14 is formed between each two adjacent sets of second ventilation ducts 13.

[0086] The lower end of the second ventilation duct 13 extends below the high-heat-generating device 41, and the extended end of the second ventilation duct 13 forms a first air outlet 141 and a second air outlet 142.

[0087] The high-heat-generating device 41 is the main power device for realizing the function of the electrical cabinet. It is multi-phase, which can increase the output power of the electrical cabinet. The multi-phase high-heat-generating devices 41 are distributed at intervals along the left and right directions of the cabinet body 1, and the main heat-generating outer surface of each phase high-heat-generating device 41 is parallel to the front and back directions of the cabinet body 1.

[0088] Since the multiphase high-heat-generating devices 41 are distributed at intervals, a flow channel 14 can be formed between each two adjacent second ventilation ducts 13. In addition, there is also a ventilation gap between the outermost high-heat-generating device 41 and the left side panel of the cabinet 1. Each flow channel 14 is connected to the first internal circulation air outlet 21 and the first internal circulation air return outlet 22 respectively. Part of the cold air output from the first internal circulation air outlet 21 blows the heat-generating outer surface of each phase high-heat-generating device 41 through each flow channel 14 and the ventilation gap, carrying away heat and ensuring uniform heat dissipation for each phase high-heat-generating device 41.

[0089] Since the high-heat-generating device 41 is the main power device and generates a lot of heat, in order to further improve its heat dissipation efficiency, the high-heat-generating device 41 is equipped with a separate heat sink. The heat sink is attached to the high-heat-generating device 41 and can remove the heat generated by the high-heat-generating device 41.

[0090] Specifically, the heat sink includes multiple spaced-apart heat dissipation fins. The heat sink is generally a low-protection-level device and does not need to be housed within the enclosed cavity 11. Furthermore, the heat sink requires a continuous flow of cool air to absorb heat; therefore, it is housed within the second ventilation duct 13, which is also located within the enclosed cavity 11 but is connected to the outside. Outside cool air flows into the second ventilation duct 13 and blows directly onto the heat sink to remove heat from the high-heat-generating device 41. It should be noted that because the heat sink is hidden within the second ventilation duct 13, its specific structure and location are not shown in the figure.

[0091] The lower end of the second ventilation duct 13 extends to the bottom of the high-heat-generating device 41. Therefore, the lower ends of each flow channel 14 also extend to the bottom of the high-heat-generating device 41. The lower extension of the flow channel 14 can directly accumulate the cold air output from the first internal circulation outlet 21 and quickly disperse it to the first low-heat-generating device 42 and the second low-heat-generating device 43 through the first air outlet 141 and the second air outlet 142.

[0092] This embodiment makes reasonable use of the heat dissipation structure of the high-heat-generating device 41, so that multiple spaced second ventilation ducts 13 form multiple flow channels 14, without the need to add other baffles to form flow channels 14, simplifying the layout of components inside the cabinet and avoiding interference with components.

[0093] In some embodiments, the aforementioned enclosed cavity 11 may also employ, for example... Figure 3 and Figure 4 The structure shown is described in the following document. Figure 3 and Figure 4 The enclosed cavity 11 is also provided with a main air inlet duct 15, which is connected to the air inlets of each of the second ventilation ducts 13; the air inlet of the main air inlet duct 15 is opened on the rear side panel of the cabinet 1; the first heat exchange structure 2 is located above the air inlet of the main air inlet duct 15.

[0094] Although each of the second ventilation ducts 13 is set independently and distributed in parallel, each of the second ventilation ducts 13 is connected to the main air intake duct 15, and the air intake of the main air intake duct 15 is opened on the rear side panel of the cabinet 1. In this way, only one main air intake is opened on the side panel of the cabinet 1, so as to reduce the number of openings and reduce the interference of other external electrical equipment on the air intake of the second ventilation ducts 13.

[0095] The main air intake duct 15 is located below the radiator and heat exchanger. The second ventilation duct 13 adopts a bottom air intake and top air outlet airflow mode. The height difference can prevent rainwater, dust and other impurities from entering the interior of the second ventilation duct 13, thereby avoiding external impurities from contaminating the radiator fins.

[0096] An air guide shroud 16 is provided at the air inlet of the main air inlet duct 15. The lower end face and the side end face of the air guide shroud 16 are provided with openings. The openings are located below the air inlet of the main air inlet duct 15 and are connected to the main air inlet duct 15.

[0097] The air guide shroud 16 protects the outer perimeter of the air inlet of the main air inlet duct 15. The top surface of the air guide shroud 16 is not open, so rainwater, dust and other impurities can fall onto the top surface of the air guide shroud 16 and flow downward along the air guide shroud 16 to avoid entering the main air inlet duct 15. The air guide shroud 16 further isolates rainwater, dust and other impurities.

[0098] The lower and side surfaces of the air guide shroud 16 are provided with openings, and multiple openings are connected to the main air intake duct 15, which can increase the air intake volume and guide the outside cold air to quickly enter the main air intake duct 15.

[0099] In addition, a main air outlet duct is provided within the enclosed cavity 11, connecting to the air outlets of each of the second ventilation ducts 13. The main air outlet duct extends along the front-to-back direction of the cabinet 1 and is located at the top of the cabinet 1. An exhaust fan is installed within the main air outlet duct, directed at the air outlets of each of the second ventilation ducts 13 to increase the air velocity and volume, allowing cool air to pass quickly through the radiator. The air outlets of the main air outlet duct are located on the front and / or rear side panels of the cabinet 1.

[0100] In some embodiments, the above-mentioned component group may also employ, for example... Figures 1 to 5 The structure shown is described in the following document. Figures 1 to 5 The component group also includes a third low-heating device 44 and a fourth low-heating device 45 disposed in the upper half of the enclosed cavity 11. The third low-heating device 44 is attached to the front end face of the high-heating device 41, and the fourth low-heating device 45 is located in front of the third low-heating device 44.

[0101] A third fan 53 is provided inside the enclosed cavity 11 behind the second air outlet 142. The third fan 53 is located below and behind the third low-heating device 44, with its air inlet side facing the second air outlet 142 and its air outlet side facing the third low-heating device 44 and the fourth low-heating device 45.

[0102] Preferably, the high-heat-generating device 41 is located in the upper rear half of the cavity of the sealing plate 17, and the third low-heat-generating device 44 is attached to the high-heat-generating device 41 and located on the leeward side of the high-heat-generating device 41. The fourth low-heat-generating device 45 is located in the upper front half of the sealed cavity 11. The high-heat-generating device 41 corresponds vertically to the first low-heat-generating device 42, and the fourth low-heat-generating device 45 corresponds vertically to the second low-heat-generating device 43. The fourth low-heat-generating device 45 and the second low-heat-generating device 43 are electrically connected. The third low-heat-generating device 44, the high-heat-generating device 41, and the first low-heat-generating device 42 are electrically connected in sequence, thereby optimizing the device layout and cable layout in the AC cavity.

[0103] Although the third low-heating device 44 is located on the leeward side of the high-heating device 41 and cannot dissipate heat through the airflow passing through the high-heating device 41, the air inlet side of the third fan 53 is aligned with the second air outlet 142, thereby drawing in cool air to quickly dissipate heat to the third low-heating device 44 and the fourth low-heating device 45.

[0104] In addition, the third low-heating device 44 is located on the leeward side of the high-heating device 41. The third low-heating device 44 is equivalent to a windproof structure. Part of the cold air output from the first internal circulation outlet 21 enters each flow channel 14 and passes through the heating surface of the high-heating device 41. After hitting the back plate of the third low-heating device 44, it turns back and flows upward and backward again through the outer surface of the high-heating device 41, and finally enters the first internal circulation return air outlet 22 for heat dissipation.

[0105] In some embodiments, a fourth fan 54 is further provided above the third low-heat-generating device 44 within the aforementioned enclosed cavity 11, with the outlet side of the fourth fan 54 facing the first internal circulation return air inlet 22, such as... Figures 2 to 5 As shown; the fourth fan 54 is used to draw hot air that has passed through the third low-heating device 44 and the fourth low-heating device 45 and deliver it to the first internal circulation return air port 22.

[0106] The third fan 53 and the fourth fan 54 work together to make the airflow form a forward-upward-backward-downward circulating flow, so that the airflow continuously enters the first heat exchange structure 2 for cooling, thereby reducing the ambient temperature of the closed cavity 11 and improving the heat dissipation efficiency.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electrical cabinet, characterized in that, include: Cabinet (1), with a closed cavity (11); The first heat exchange structure (2) is disposed on the upper half of the rear side panel of the cabinet (1); the first heat exchange structure (2) has a first internal circulation air outlet (21) and a first internal circulation air return outlet (22) facing the closed cavity (11) respectively; the first internal circulation air outlet (21) is located below the first internal circulation air return outlet (22); The second heat exchange structure (3) is disposed in the lower half of the front side panel of the cabinet (1); the second heat exchange structure (3) has a second internal circulation air outlet (31) and a second internal circulation air return outlet (32) facing the closed cavity (11); the second internal circulation air outlet (31) is located below the second internal circulation air return outlet (32); The component group includes a high-heat-generating device (41), a first low-heat-generating device (42), and a second low-heat-generating device (43); the high-heat-generating device (41) is located in the upper half of the enclosed cavity (11), the first low-heat-generating device (42) is located in the lower rear half of the enclosed cavity (11), and the second low-heat-generating device (43) is located in the lower front half of the enclosed cavity (11); Among them, part of the cold air output from the first internal circulation air outlet (21) flows forward through the high-heat-generating device (41) and flows back to the first internal circulation return air outlet (22), and part of the cold air flows downward through the first low-heat-generating device (42) and flows to the second internal circulation return air outlet (32); the cold air output from the second internal circulation air outlet (31) flows through the second low-heat-generating device (43) and flows back to the second internal circulation return air outlet (32) for heat exchange.

2. The electrical cabinet as described in claim 1, characterized in that, The first heat exchange structure (2) is the first heat exchanger, and the second heat exchange structure (3) is the second heat exchanger.

3. The electrical cabinet as described in claim 2, characterized in that, A first fan (51) is provided at the first internal circulation air outlet (21), and the air outlet side of the first fan (51) faces the front side panel of the cabinet (1); a second fan is provided at the second internal circulation air outlet (31), and the second fan faces the lower side panel of the cabinet (1). The first heat exchanger has a first heat exchange core, and the second heat exchanger has a second heat exchange core, wherein the heat exchange volume of the first heat exchange core is greater than the heat exchange volume of the second heat exchange core.

4. The electrical cabinet as described in claim 1, characterized in that, The first heat exchange structure (2) is the first heat exchanger; the inner side of the front panel of the cabinet (1) is provided with a sealing plate (17), and the second heat exchange structure (3) is the vertical channel (18) formed by the sealing plate (17) and the front panel of the cabinet (1). The air inlet of the vertical channel (18) faces the second low-heat device (43), and the air outlet faces the upper front part of the enclosed cavity (11); a fifth fan (55) is provided at the air inlet of the vertical channel (18). The cold air output from the first internal circulation air outlet (21) flows downward through the first low heat generation device (42) and the second low heat generation device (43) in sequence, and enters the vertical channel (18) for heat exchange through the front panel of the cabinet (1).

5. The electrical cabinet as described in claim 1, characterized in that, The lower half of the enclosed cavity (11) is provided with a first ventilation duct (12), which is located between the first low-heat device (42) and the second low-heat device (43); the component group also includes a low protection module (46) disposed in the first ventilation duct (12). The air inlet of the first ventilation duct (12) is located on the lower side panel of the cabinet (1), and the air outlet of the first ventilation duct (12) is located on the front side panel of the cabinet (1); the second heat exchange structure (3) is located below the air outlet of the first ventilation duct (12).

6. The electrical cabinet as described in claim 1, characterized in that, The upper half of the enclosed cavity (11) is provided with a flow channel (14), the flow channel (14) having an air inlet facing the first internal circulation air outlet (21), a first air outlet (141) facing the lower side panel of the cabinet (1), and a second air outlet (142) facing the front side panel of the cabinet (1).

7. The electrical cabinet as described in claim 6, characterized in that, The high-heat-generating device (41) is distributed in multiple phases along the left and right directions of the cabinet (1), and each phase of the high-heat-generating device (41) is attached to a heat sink. The enclosed cavity (11) is also provided with multiple sets of second ventilation ducts (13) corresponding to the radiator, and the radiator is located in the corresponding second ventilation duct (13); the flow passage (14) is formed between each two adjacent sets of second ventilation ducts (13). The lower end of the second ventilation duct (13) extends below the high-heat device (41), and the extended end of the second ventilation duct (13) forms the first air outlet (141) and the second air outlet (142).

8. The electrical cabinet as described in claim 7, characterized in that, The enclosed cavity (11) is also provided with a main air inlet duct (15), which is connected to the air inlet of each of the second ventilation ducts (13); the air inlet of the main air inlet duct (15) is opened on the rear side panel of the cabinet (1); the first heat exchange structure (2) is located above the air inlet of the main air inlet duct (15).

9. The electrical cabinet as described in claim 6, characterized in that, The component group also includes a third low-heating device (44) and a fourth low-heating device (45) disposed in the upper half of the closed cavity (11). The third low-heating device (44) is attached to the front end face of the high-heating device (41), and the fourth low-heating device (45) is located in front of the third low-heating device (44). A third fan (53) is provided in front of the second air outlet (142) inside the enclosed cavity (11). The third fan (53) is located behind and below the third low-heat device (44), with the air inlet side facing the second air outlet (142) and the air outlet side facing the third low-heat device (44) and the fourth low-heat device (45).

10. The electrical cabinet as described in claim 9, characterized in that, A fourth fan (54) is also provided above the third low-heat device (44) in the enclosed cavity (11), and the air outlet side of the fourth fan (54) faces the first internal circulation return air port (22). The fourth fan (54) is used to draw hot air that has passed through the third low-heat device (44) and the fourth low-heat device (45) and deliver it to the first internal circulation return air port (22).

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