Electrical cabinet

Abstract

The invention provides an electrical cabinet, which belongs to the technical field of electrical equipment and comprises a cabinet body, a first heat exchange structure, a second heat exchange structure and a component group. The cabinet body is provided with a closed cavity; the first heat exchange structure is arranged at the upper half part of the rear side plate of the cabinet body; the first heat exchange structure is provided with a first inner circulation air outlet and a first inner circulation air return opening. The second heat exchange structure is arranged at the lower half part of the front side plate of the cabinet body; the component group comprises a high heating device, a first low heating device and a second low heating device; the high-heating device is located at the upper half part of the closed cavity, the first low-heating device is located at the rear lower half part of the closed cavity, and the second low-heating device is located at the front lower half part of the closed cavity. According to the electrical cabinet provided by the invention, the first heat exchange structure and the second heat exchange structure are arranged in an up-down staggered manner, and hot air flowing through the first low-heating device and the second low-heating device can enter the second heat exchange structure for heat exchange, so that the problem of local hot spots is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical equipment, and more specifically, relates to an electrical cabinet. Background Art

[0002] Photovoltaic inverters, energy storage converters and other electrical cabinets usually include inverter modules, reactor modules and capacitor busbar modules and other power devices. Since such electrical cabinets are usually used in harsh environments such as high temperature, high humidity and high dust, in order to protect the power devices inside, the electrical cabinets are required to have high sealing performance and high protection level, so only closed heat dissipation can be used for the electrical cabinets.

[0003] Since the inner cavity of the electrical cabinet is a closed space, the heat dissipation effect is poor, especially for electrical cabinets with larger spaces, there will also be local hot spots. Summary of the invention

[0004] The object of the present invention is to provide an electrical cabinet and an electrical cabinet, aiming to solve the problems of poor heat dissipation and local hot spots of closed electrical cabinets in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide an electrical cabinet, comprising: A cabinet having a closed cavity; A first heat exchange structure is arranged at the upper half of the rear side plate 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 closed cavity respectively; the first internal circulation air outlet is located below the first internal circulation air return outlet; A second heat exchange structure is arranged at the lower half of the front side plate of the cabinet; A component group, including 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 closed cavity, the first low-heat-generating device is located in the rear lower half of the closed cavity, and the second low-heat-generating device is located in the front lower half of the closed cavity; Part of the cold air output from the first internal circulation air outlet flows forward through the high-heat-generating device and flows back to the first internal circulation return air outlet for heat exchange, and part of the cold air flows downward through the first low-heat-generating device and the second low-heat-generating device in turn, and enters the second heat exchange structure for heat exchange.

[0006] In a possible implementation, the first heat exchange structure is a first heat exchanger, and the second heat exchange structure is a second heat exchanger; The second heat exchanger has a second internal circulation air outlet and a second internal circulation air return outlet facing the closed cavity respectively; the second internal circulation air outlet is located below the second internal circulation air return outlet; Among them, part of the cold air output from the first internal circulation air outlet flows forward through the high-heat generating device and flows back to the first internal circulation return air outlet, and part of the cold air flows downward through the first low-heat generating device and flows to the second internal circulation return air outlet; the cold air output from the second internal circulation air outlet flows through the second low-heat generating device and flows back to the second internal circulation return air outlet for heat exchange.

[0007] In some embodiments, a first fan is provided at the first internal circulation air outlet, and the air outlet side of the first fan faces the front side plate of the cabinet; a second fan is provided at the second internal circulation air outlet, and the second fan faces the lower side plate of the cabinet; The first heat exchanger has a first heat exchange core, and the second heat exchanger has a second heat exchange core. The heat exchange volume of the first heat exchange core is greater than the heat exchange volume of the second heat exchange core.

[0008] In a possible implementation, the first heat exchange structure is a first heat exchanger; a sealing plate is provided on the inner side of the front side plate of the cabinet, and the second heat exchange structure is a vertical channel surrounded by the sealing plate and the front side plate of the cabinet; The air inlet of the vertical channel faces the second low-heat-generating device, and the air outlet faces the front upper half of the closed cavity; a fifth fan is provided at the air inlet of the vertical channel; Part of the cold air output from the first internal circulation air outlet flows downward through the first low-heat generating device and the second low-heat generating device in sequence, enters the vertical channel, and exchanges heat through the front side panel of the cabinet.

[0009] In a possible implementation, a first ventilation duct is provided at the lower half of the closed cavity, and the first ventilation duct is located between the first low-heat generating device and the second low-heat generating device; the component group further includes a low-protection module arranged in the first ventilation duct; The air inlet of the first ventilation duct is opened on the lower side plate of the cabinet, and the air outlet of the first ventilation duct is opened on the front side plate of the cabinet; the second heat exchange structure is located below the air outlet of the first ventilation duct.

[0010] In a possible implementation, a flow channel is provided in the upper half of the closed cavity, and the flow channel has an air inlet end facing the first internal circulation air outlet, a first air outlet end facing the lower side panel of the cabinet, and a second air outlet end facing the front side panel of the cabinet.

[0011] 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 devices is closely connected to a heat sink; The closed cavity is also provided with a plurality of groups of second ventilation ducts corresponding to the radiators one by one, and the radiators are located in the corresponding second ventilation ducts; the flow passage is formed between each two adjacent groups of the second ventilation ducts; The lower end of the second ventilation duct extends to below the high heat generating device, and the extended end of the second ventilation duct forms the first air outlet end and the second air outlet end.

[0012] In some embodiments, a main air inlet duct is also provided in the closed cavity, and the main air inlet duct 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; and the first heat exchange structure is located above the air inlet of the main air inlet duct.

[0013] In some embodiments, the component group further includes a third low heat generating device and a fourth low heat generating device disposed in the upper half of the closed cavity, the third low heat generating device is attached to the front end surface of the high heat generating device, and the fourth low heat generating device is located in front of the third low heat generating device; A third fan is provided in the closed cavity behind the second air outlet end. The third fan is located at the rear and lower part of the third low-heat-generating device, with its air inlet side facing the second air outlet end and its air outlet side facing the third low-heat-generating device and the fourth low-heat-generating device.

[0014] In some embodiments, a fourth fan is further provided above the third low-heat-generating device in the closed cavity, and an air outlet side of the fourth fan faces the first internal circulation return air outlet; The fourth fan is used to extract the hot air that has passed through the third low-heat-generating device and the fourth low-heat-generating device and transport it to the first internal circulation return air outlet.

[0015] The beneficial effects of the electrical cabinet provided by the present invention are: compared with the prior art, it has the following effects: Placing the component group in a closed cavity can meet the requirements of high sealing performance and high protection level of the cabinet; The high heat generating device is arranged in the upper half of the closed cavity, and the first low heat generating device and the second low heat generating device are arranged in the lower half of the closed cavity, which optimizes the spatial layout of the closed cavity, facilitates electrical connection of the component group, and optimizes the cable layout; The first heat exchange structure corresponds to the front and back of the high-heat-generating device. The cold air output from the first internal circulation air outlet can flow through the high-heat-generating device to dissipate heat therefrom, and can also flow through the first low-heat-generating device and the second low-heat-generating device to dissipate heat therefrom, thereby improving the heat dissipation effect of the closed cavity. Moreover, the first heat exchange structure and the second heat exchange structure are alternately arranged up and down, and 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of an electrical cabinet provided in an embodiment of the present invention Figure 1 (The left side panel of the cabinet is not shown in the figure); Figure 2 for Figure 1 Rear view of the cabinet (the right side panel of the cabinet is not shown in the figure, and the arrows indicate the direction of air circulation in the closed cavity); Figure 3 for Figure 1 Schematic diagram of the structure of the electrical cabinet provided Figure 2 (The left side panel of the cabinet is not shown in the figure); Figure 4 for Figure 1 Schematic diagram of the structure of the electrical cabinet provided Figure 3 (The left side panel of the cabinet and the left side panel of the second air duct are not shown in the figure); Figure 5 A schematic structural diagram 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 arrow indicates the direction of air circulation in the closed cavity).

[0018] In the figure: 1. Cabinet; 11. Closed cavity; 12. First ventilation duct; 13. Second ventilation duct; 14. Flow passage; 141. First air outlet; 142. Second air outlet; 15. Main air inlet; 16. Air guide cover; 17. Closing plate; 18. Vertical passage; 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; 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; 41. High heat generation device; 42. First low heat generation device; 43. Second low heat generation device; 44. Third low heat generation device; 45. Fourth low heat generation device; 46. Low protection module; 51. The first fan; 53. The third fan; 54. The fourth fan; 55. The fifth fan. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] Please also read Figures 1 to 5 , the electrical cabinet provided by the present invention is now described. The electrical cabinet includes a cabinet body 1, a first heat exchange structure 2, a second heat exchange structure 3 and a component group. The cabinet body 1 has a closed cavity 11; the first heat exchange structure 2 is arranged in the upper half of the rear side plate of the cabinet body 1; the first heat exchange structure 2 has a first internal circulation air outlet 21 and a first internal circulation return air outlet 22 facing the closed cavity 11 respectively; the first internal circulation air outlet 21 is located below the first internal circulation return air outlet 22; the second heat exchange structure 3 is arranged in the lower half of the front side plate of the cabinet body 1; 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 closed cavity 11, the first low-heat-generating device 42 is located in the rear lower half of the closed cavity 11, and the second low-heat-generating device 43 is located in the front lower half of the closed cavity 11.

[0021] Among them, part of the cold air output from the first internal circulation air outlet 21 flows forward through the high-heating device 41 and flows back to the first internal circulation return air outlet 22 for heat exchange, and part of the cold air flows downward through the first low-heating device 42 and the second low-heating device 43 in turn, and enters the second heat exchange structure 3 for heat exchange.

[0022] The cabinet 1 is a rectangular parallelepiped structure, and is composed of a front side panel, a rear side panel, a left side panel, a rear side panel, an upper side panel, a lower side panel, and a support frame connecting and supporting the above panels. The cabinet 1 has a closed cavity 11, which can be understood as the above six panels of the cabinet 1 can enclose the closed cavity 11, or the above six panels of the cabinet 1 cooperate with other panels in the cabinet 1 to enclose the closed cavity 11. The closed cavity 11 is not connected to the outside world, so that the closed cavity 11 has high sealing performance and high protection level, which can enable the electrical cabinet to be used in harsh environments such as high temperature, high humidity, and high dust, and meet the use requirements of the component group.

[0023] Since part of the cold air output from the first internal circulation air outlet 21 will flow forward through the high heat generating device 41, and part of the cold air will flow downward and forward through the first low heat generating device 42 and the second low heat generating device 43 in sequence, in order to increase the airflow path and reasonably allocate the layout positions of the component groups, the front and rear directions of the cabinet 1 are the length directions of the cabinet 1, and the front side panels and the rear side panels of the cabinet 1 are perpendicular to the length directions, that is, the first heat exchange structure 2 and the second heat exchange structure 3 are respectively arranged on two side panels perpendicular to the length directions of the cabinet 1.

[0024] In addition, the above-mentioned limitations on the front, back, left, right, up and down directions are based on the front door panel of the cabinet 1 after installation. Generally, the cabinet 1 is provided with a front door panel (i.e., a front side panel), which can be opened to maintain components. An operation panel is also provided on the front door panel.

[0025] The component group is generally an electrical device with a high protection level, which will emit heat when working. Specifically, the high heat generation device 41 has a large heat generation, so the high heat generation device 41 is arranged in the upper half of the closed cavity 11, corresponding to the front and back of the first heat exchange structure 2. The first low heat generation device 42 and the second low heat generation device 43 have a small heat generation. According to the aerodynamic principle of the natural sinking of cold air, the first low heat generation device 42 and the second low heat generation device 43 are arranged in the lower half of the closed cavity 11. The high heat generation device 41, the first low heat generation device 42 and the second low heat generation device 43 are electrically connected in sequence.

[0026] Since the inner cavity of the cabinet 1 is a closed cavity 11 and the heat generated by the component group is large, the heat cannot be completely dissipated by heat conduction of the cabinet 1 itself. Therefore, a heat exchange structure needs to be set on the cabinet 1, and the heat of the component group is taken away by air flow and exchanged through the heat exchange structure.

[0027] 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 port 22. The airflow in the closed cavity 11 enters the heat exchanger through the first internal circulation air return port 22 for heat exchange and cooling, and then enters the closed cavity 11 from the first internal circulation air outlet 21. The second heat exchange structure 3 can take in and out air.

[0028] Since the first heat exchange structure 2 is arranged at the upper half of the rear side plate of the cabinet 1, and the second heat exchange structure 3 is arranged at the lower half of the front side plate of the cabinet 1, the first heat exchange structure 2 and the second heat exchange structure 3 are staggered in an up-and-down manner. 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 back upward to the first internal circulation return air outlet 22 to dissipate heat, thereby dissipating the high-heat-generating device 41, and 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 turn, and enter the second heat exchange structure 3 for heat exchange, thereby dissipating the heat of the first low-heat-generating device 42 and the second low-heat-generating device 43; cold air flows through all component groups, thereby avoiding the problem of hot spots inside the cabinet 1.

[0029] 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 use requirements of the cabinet with high sealing performance and high protection level; The high heat generating device 41 is arranged in the upper part of the closed cavity 11, and the first low heat generating device 42 and the second low heat generating device 43 are arranged in the lower part of the closed cavity 11, which optimizes the spatial layout of the closed cavity 11, facilitates the electrical connection of the component group, and optimizes the cable layout; The first heat exchange structure 2 corresponds to the high heat generating device 41 front and back, and the cold air output from the first internal circulation air outlet 21 can flow through the high heat generating device 41 to dissipate heat to it, and can also flow through the first low heat generating device 42 and the second low heat generating device 43 to dissipate heat to both, thereby improving the heat dissipation effect of the closed cavity 11; and the first heat exchange structure 2 and the second heat exchange structure 3 are arranged alternately up and down, and 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 of the front lower half of the closed cavity 11 and solving the problem of local hot spots.

[0030] In some embodiments, the first heat exchange structure 2 and the second heat exchange structure 3 may be formed as follows: Figures 1 to 4 The structure shown, see 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; Among them, part of the cold air output from the first internal circulation air outlet 21 flows forward through the high-heating 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-heating 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-heating device 43 and flows back to the second internal circulation return air outlet 32 ​​for heat exchange.

[0031] The first heat exchanger is preferably an air-to-air heat exchanger having a first heat exchange core, which can introduce cold air from the outside and can also recover hot air from the closed cavity 11; the cold air from the outside passes through the first heat exchange core and takes away the heat of the hot air in the closed cavity 11 passing through the first heat exchange core, 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 the two will not offset each other.

[0032] The first heat exchanger further has a first external circulation air inlet 23 and a first external circulation air outlet 24 facing the outside respectively, and the first external circulation air inlet 23 is located below the first external circulation air outlet 24 .

[0033] Specifically, the circulating airflow in the closed cavity 11 enters the first heat exchanger through the first internal circulation return air port 22, and after heat exchange and cooling in the first core, enters the closed cavity 11 from the first internal circulation air outlet 21. The external airflow enters the first heat exchanger from the first external circulation air inlet 23, takes away heat after passing through the first heat exchange core to reduce the temperature of the first heat exchange core, and then flows out of the first heat exchanger from the first external circulation air outlet 24.

[0034] The first internal circulation return air vent 22 is located above the first internal circulation air outlet 21, which is in line with 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, which is in line with the natural upward flow trend of hot air.

[0035] The structure of the second heat exchanger is similar to that of the first heat exchanger, and 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 port 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 repeated here.

[0036] The first heat exchanger is used in conjunction with the second heat exchanger. For specific airflow patterns, please refer to Figure 2 According to the air flow trend of cold air naturally sinking and hot air naturally rising, part of the cold air output from the first internal circulation air outlet 21 flows forward through the high-heating device 41 and flows 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-heating 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 backward through the second low-heating device 43 and flows upward and forward to the second internal circulation return air outlet 32 ​​for heat exchange.

[0037] Since the second heat exchanger not only has a heat exchange effect, but can also output cold air to the lower half of the closed cavity 11 to dissipate heat for the second low-heat-generating device 43, cold air directly passes through the second low-heat-generating device 43, thereby improving the heat dissipation effect thereof, further avoiding the high temperature of the front lower half of the closed cavity 11, and solving the problem of local hot spots.

[0038] Since the second heat exchanger is mainly used to dissipate heat for the second low-heat-generating device 43, and the first heat exchanger needs to dissipate heat for all the component groups, the heat exchange efficiency of the first heat exchanger is greater than that of the second heat exchanger. In order to increase the heat exchange efficiency of the first heat exchanger, on the basis of the above-mentioned embodiment, 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 plate of the cabinet 1, such as 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 plate of the cabinet 1; in addition, the first heat exchanger has a first heat exchange core, and 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.

[0039] The air outlet side of the first fan 51 faces the front side panel of the cabinet 1, that is, 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 outputted from the first internal circulation air outlet 21 to the closed cavity 11, so that part of the cold air directly flows to the high heat generating device 41, and part of the cold air flows to the first low heat generating device 42 according to the natural downward flow trend of the cold air.

[0040] The air outlet side of the second fan is toward the lower side plate of the cabinet 1, not toward the second low heat generating device 43. Therefore, the cold air output from the second internal circulation air outlet 31 first flows downward and then is rebounded to flow backward through the second low heat generating device 43. The airflow rebound can correspondingly slow down the flow speed of the cold air toward the second low heat generating device 43 to avoid colliding with the airflow passing through the first low heat generating device 42 and flowing forward.

[0041] Moreover, the heat exchange volume of the first heat exchange core is greater than that of the second heat exchange core, so 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.

[0042] In some embodiments, the first heat exchange structure 2 and the second heat exchange structure 3 may also be configured as follows: Figure 5 The structure shown, see Figure 5The first heat exchange structure 2 is the first heat exchanger; a sealing plate 17 is provided on the inner side of the front side plate of the cabinet 1, and the second heat exchange structure 3 is a vertical channel 18 surrounded by the sealing plate 17 and the front side plate of the cabinet 1; the air inlet of the vertical channel 18 faces the second low heat generating device 43, and the air outlet faces the front upper 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 heat generating device 42 and the second low heat generating device 43 in turn, and enters the vertical channel 18, and exchanges heat through the front side plate of the cabinet 1.

[0043] The sealing plate 17 is located behind the front side plate of the cabinet 1. A vertical channel 18 can be formed by means of the sealing plate 17 and the front side plate of the cabinet 1. The vertical channel 18 has air intake at the bottom and air outlet at the top, which conforms to the natural tendency of hot air to flow upward.

[0044] Preferably, the fifth fan 55 is an exhaust fan. The fifth fan 55 draws air to form a negative pressure in the lower half of the closed cavity 11 to increase the speed of the airflow flowing forward. Moreover, the fifth fan 55 can also send part of the heated airflow into the vertical channel 18. Since the front side panel of the cabinet 1 directly faces the outside, the airflow can transfer heat to the outside through the front side panel when passing through the vertical channel 18, so as to improve the heat exchange efficiency and reduce the temperature of the front lower half of the closed cavity 11.

[0045] In addition, after the airflow is cooled down through the vertical channel 18, it re-enters the closed cavity 11 from the air outlet of the vertical channel 18 and flows back to the first internal circulation return air outlet 22. Since the air outlet of the vertical channel 18 is located above the air inlet of the vertical channel 18, the return air path of the airflow can be changed by reasonably determining the height position of the air outlet of the vertical channel 18, so that the heat can be reasonably dissipated according to the heating requirements of the electrical components in the upper part of the closed cavity 11.

[0046] In some embodiments, the electrical cabinet may also be used as follows Figure 1 , Figure 3 and Figure 4 The structure shown, see Figure 1 , Figure 3 and Figure 4 A first ventilation duct 12 is provided in the lower half of the closed cavity 11 , and the first ventilation duct 12 is located between the first low-heat generating device 42 and the second low-heat generating device 43 ; the component group also includes a low-protection module 46 arranged in the first ventilation duct 12 .

[0047] The low protection module 46 is generally a component with a large volume and a heavy weight. It usually generates a lot of heat, but the protection requirements are not high. There is no need to put the low protection module 46 into the closed cavity 11. The low protection module 46 is placed at the bottom of the cabinet 1 and a first ventilation duct 12 is provided on the outside to optimize the layout of components in the lower half of the closed cavity 11, and reasonably utilize the load-bearing structure of the entire cabinet 1 to increase the stability of the low protection module 46 inside the cabinet 1.

[0048] Specifically, the air inlet of the first ventilation duct 12 is opened on the lower side panel of the cabinet 1 , and the air outlet of the first ventilation duct 12 is opened 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 .

[0049] 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 the hot air flow. In addition, the air outlet of the first ventilation duct 12 is provided on the front side panel of the cabinet 1, and the upper lateral part thereof is far away from the high heat generating device 41 and the first low heat generating device 42, which does not affect the electrical connection between the two, thereby optimizing the spatial layout of the closed cavity 11.

[0050] In some embodiments, the closed cavity 11 may also be formed as follows: Figure 1 and Figure 3 The structure shown, see Figure 1 and Figure 3 A flow passage 14 is provided in the upper half of the closed cavity 11, and the flow passage 14 has an air inlet end facing the first internal circulation air outlet 21, a first air outlet end 141 facing the lower side panel of the cabinet 1, and a second air outlet end 142 facing the front side panel of the cabinet 1.

[0051] The flow channel 14 extends along the front-to-back direction of the cabinet 1, and its air inlet end is completely aligned with the first internal circulation air outlet 21. All the cold air output from the first internal circulation air outlet 21 accumulates in the flow channel 14, thereby preventing the airflow from being dispersed and diffused into the closed cavity 11 after being output from the first internal circulation air outlet 21, causing cold loss.

[0052] The first air outlet end 141 is toward the lower side plate of the cabinet 1, that is, toward the first low heat generating device 42. Some of the cold air accumulated in the flow duct can be quickly dispersed to the first low heat generating device 42 through the first air outlet end 141. The second air outlet end 142 is toward the front side plate of the cabinet 1, that is, toward the top of the second low heat generating device 43. Some of the cold air accumulated in the flow duct can also be quickly dispersed to the second low heat generating device 43 through the second air outlet end 142.

[0053] Preferably, in order to increase the air collection volume and air flow speed of the flow passage 14 , at least two flow passages 14 may be spaced apart and distributed along the left-right direction of the cabinet 1 .

[0054] It should be noted that the flow channel 14 is a spatial structure, which can be formed by enclosing multiple partitions arranged in the closed cavity 11, or by means of 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 directions of the cabinet 1 and can accumulate cold air.

[0055] In some embodiments, the high heat generation device 41 may be implemented as follows: Figure 1 , Figure 3 and Figure 4 The structure shown, see Figure 1 , Figure 3 and Figure 4 The high-heat-generating devices 41 are distributed in multiple phases at intervals along the left and right directions of the cabinet 1, and each phase of the high-heat-generating device 41 is closely connected to a radiator; a plurality of groups of second ventilation ducts 13 corresponding to the radiators are also provided in the closed cavity 11, and the radiators are located in the corresponding second ventilation ducts 13; the above-mentioned flow passage 14 is formed between each two adjacent groups of second ventilation ducts 13.

[0056] The lower end of the second ventilation duct 13 extends to below the high heat generating device 41 , and the extended end of the second ventilation duct 13 forms a first air outlet end 141 and a second air outlet end 142 .

[0057] The high-heat-generating device 41 is the main power device for realizing the function of the electrical cabinet. It is provided with multiple phases to 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 1, and the main heat-generating outer surface of each phase high-heat-generating device 41 is parallel to the front and rear directions of the cabinet 1.

[0058] Since the multi-phase high-heat-generating devices 41 are distributed at intervals, a flow channel 14 can be formed between every two adjacent second ventilation ducts 13. In addition, there is a ventilation gap between the high-heat-generating device 41 located on the outermost side and the left side panel of the cabinet 1. Each flow channel 14 is respectively connected to the first internal circulation air outlet 21 and the first internal circulation return air outlet 22. Part of the cold air output from the first internal circulation air outlet 21 blows on the heating outer surface of each phase high-heat-generating device 41 through each flow channel 14 and the ventilation gap to take away the heat and ensure uniform heat dissipation of each phase high-heat-generating device 41.

[0059] Since the high heat generation device 41 is a main power device, it generates a large amount of heat. In order to further improve its heat dissipation efficiency, the high heat generation device 41 is equipped with a separate radiator. The radiator is fitted to the high heat generation device 41 and can take away the heat generated by the high heat generation device 41.

[0060] Specifically, the radiator includes a plurality of heat dissipation fins arranged at intervals. The radiator is generally a low protection level device and does not need to be arranged in the closed cavity 11. Moreover, the radiator needs to continuously pass cold air to absorb heat. Therefore, the radiator is arranged in the second ventilation duct 13. The second ventilation duct 13 is also located in the closed cavity 11, but is connected to the outside world. The cold air from the outside enters the second ventilation duct 13 and blows directly to the radiator to take away the heat of the high-heat-generating device 41. It should be noted that since the radiator is hidden in the second ventilation duct 13, the specific structure and position of the radiator are not shown in the figure.

[0061] The lower end of the second ventilation duct 13 extends to the bottom of the high heat generating device 41, so the lower end of each flow channel 14 also extends to the bottom of the high heat generating device 41. The lower end extension portion of the flow channel 14 can directly accumulate the cold air output by the first internal circulation air 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 end 141 and the second air outlet end 142.

[0062] This embodiment rationally utilizes the heat dissipation structure of the high-heat-generating device 41, so that a plurality of spaced-apart second ventilation ducts 13 form a plurality of flow channels 14. No additional baffles are required to form the flow channels 14, which simplifies the layout of components inside the cabinet and avoids interference with components.

[0063] In some embodiments, the closed cavity 11 may also be formed as follows: Figure 3 and Figure 4 The structure shown, see Figure 3 and Figure 4 A main air inlet duct 15 is also provided in the closed cavity 11, and the main air inlet duct 15 is connected to the air inlets of each second ventilation duct 13; the air inlet of the main air inlet duct 15 is opened on the rear side plate of the cabinet 1; the first heat exchange structure 2 is located above the air inlet of the main air inlet duct 15.

[0064] Although each second ventilation duct 13 is independently arranged and distributed in parallel, each second ventilation duct 13 is connected to the main air inlet duct 15, and the air inlet of the main air inlet duct 15 is opened on the rear side panel of the cabinet 1. In this way, only one main air inlet is required to be opened on the side panel of the cabinet 1, so as to reduce the number of openings, that is, to reduce the interference of other external electrical equipment on the air inlet of the second ventilation duct 13.

[0065] The main air inlet duct 15 is located below the radiator and the heat exchanger, so the second ventilation duct 13 adopts a gas flow mode of lower air inlet and upper air outlet. The height difference can prevent impurities such as rain and dust from entering the interior of the second ventilation duct 13, thereby avoiding external impurities from contaminating the fins of the radiator.

[0066] An air guide cover 16 is provided at the air inlet of the main air inlet duct 15 . The lower end surface and the side end surface of the air guide cover 16 are both 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 .

[0067] The wind guide cover 16 protects the periphery of the air inlet of the main air inlet duct 15. The top surface of the wind guide cover 16 is not open. Impurities such as rainwater and dust can fall to the top surface of the wind guide cover 16 and flow downward along the wind guide cover 16 to avoid entering the main air inlet duct 15. The wind guide cover 16 plays a role in further isolating impurities such as rainwater and dust.

[0068] The lower end surface and the side end surface of the air guide cover 16 are both provided with openings, and the multiple openings are respectively connected to the main air inlet duct 15, which can increase the air intake volume and guide the external cold air to quickly enter the main air inlet duct 15.

[0069] In addition, a main air outlet is also provided in the closed cavity 11, and the main air outlet is connected to the air outlet end of each second ventilation air duct 13. The main air outlet extends along the front-to-back direction of the cabinet 1 and is arranged at the top of the cabinet 1. An exhaust fan is provided in the main air outlet, and the exhaust fan is aligned with the air outlet of each second ventilation air duct 13 to increase the wind speed and air volume so that the cold air passes through the radiator quickly. The air outlet of the main air outlet is arranged on the front side panel and / or the rear side panel of the cabinet 1.

[0070] In some embodiments, the above component group can also be used as follows Figures 1 to 5 The structure shown, see Figures 1 to 5 The component group also includes a third low heat generating device 44 and a fourth low heat generating device 45 which are arranged in the upper half of the closed cavity 11 . The third low heat generating device 44 is attached to the front end surface of the high heat generating device 41 , and the fourth low heat generating device 45 is located in front of the third low heat generating device 44 .

[0071] A third fan 53 is provided in the closed cavity 11 behind the second air outlet end 142 . The third fan 53 is located at the rear and lower part of the third low heat generating device 44 , with its air inlet side facing the second air outlet end 142 and its air outlet side facing the third low heat generating device 44 and the fourth low heat generating device 45 .

[0072] Preferably, the high heat generating device 41 is located in the rear upper 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 is located on the leeward side of the high heat generating device 41. The fourth low heat generating device 45 is located in the front upper half of the closed cavity 11. The high heat generating device 41 corresponds to the first low heat generating device 42 up and down, the fourth low heat generating device 45 corresponds to the second low heat generating device 43 up and down, and the fourth low heat generating device 45 is electrically connected to the second low heat generating device 43, and 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.

[0073] Although the third low heat generating device 44 is located on the leeward side of the high heat generating device 41, it cannot dissipate heat through the airflow passing through the high heat generating device 41. However, the air inlet side of the third fan 53 is aligned with the second air outlet end 142, so that cold air can be drawn to quickly dissipate heat to the third low heat generating device 44 and the fourth low heat generating device 45, so as to dissipate heat to the third low heat generating device 44 and the fourth low heat generating device 45.

[0074] In addition, the third low heat generating device 44 is located on the leeward side of the high heat generating device 41. The third low heat generating device 44 is equivalent to a wind shielding structure. Part of the cold air outputted from the first internal circulation air outlet 21 enters each flow channel 14 and passes through the heating surface of the high heat generating device 41. After hitting the back plate of the third low heat generating device 44, it turns back, and then flows upward and backward through the outer surface of the high heat generating device 41 again, and finally enters the first internal circulation return air outlet 22 for heat dissipation.

[0075] In some embodiments, a fourth fan 54 is further provided above the third low-heat-generating device 44 in the closed cavity 11, and the air outlet side of the fourth fan 54 faces the first internal circulation return air outlet 22. Figures 2 to 5 As shown; the fourth fan 54 is used to extract the hot air passing through the third low-heating device 44 and the fourth low-heating device 45 and transport it to the first internal circulation return air outlet 22.

[0076] The third fan 53 and the fourth fan 54 cooperate to form a forward-upward-backward-downward circulation flow of the airflow, 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.

[0077] 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 in the protection scope of the present invention.

Claims

1. An electrical cabinet, characterized in that: include: A cabinet (1) having a closed cavity (11); A first heat exchange structure (2) is arranged at the upper half of the rear side plate 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); A second heat exchange structure (3) is arranged on the lower half of the front side plate of the cabinet (1); A component group, comprising 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 rear lower half of the closed cavity (11), and the second low-heat-generating device (43) is located in the front lower half of the closed cavity (11); 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 air return outlet (22) for heat exchange, and part of the cold air flows downward through the first low-heat-generating device (42) and the second low-heat-generating device (43) in sequence and enters the second heat exchange structure (3) for heat exchange.

2. The electrical cabinet according to claim 1, characterized in that: 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); 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.

3. The electrical cabinet according to 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 plate 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 plate 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. 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 according to claim 1, characterized in that: The first heat exchange structure (2) is a first heat exchanger; a sealing plate (17) is provided on the inner side of the front side plate of the cabinet (1); and the second heat exchange structure (3) is a vertical channel (18) enclosed by the sealing plate (17) and the front side plate of the cabinet (1); The air inlet of the vertical channel (18) faces the second low-heat-generating device (43), and the air outlet faces the front upper 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 downwards through the first low-heat generating device (42) and the second low-heat generating device (43) in sequence, and enters the vertical channel (18) to exchange heat through the front side panel of the cabinet (1).

5. The electrical cabinet according to claim 1, characterized in that: A first ventilation duct (12) is provided at the lower half of the closed cavity (11), and the first ventilation duct (12) is located between the first low-heat generating device (42) and the second low-heat generating device (43); the component group further comprises a low-protection module (46) arranged in the first ventilation duct (12); The air inlet of the first ventilation duct (12) is arranged on the lower side panel of the cabinet (1), and the air outlet of the first ventilation duct (12) is arranged 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 according to claim 1, characterized in that: The upper half of the closed cavity (11) is provided with a flow passage (14), the flow passage (14) having an air inlet end facing the first internal circulation air outlet (21), a first air outlet end (141) facing the lower side plate of the cabinet (1), and a second air outlet end (142) facing the front side plate of the cabinet (1).

7. The electrical cabinet according to claim 6, characterized in that: The high-heat generating devices (41) are distributed in multiple phases at intervals along the left-right direction of the cabinet (1), and each phase of the high-heat generating device (41) is fitted and connected to a heat sink; The closed cavity (11) is further provided with a plurality of groups of second ventilation ducts (13) corresponding one to one with the radiators, and the radiators are located in the corresponding second ventilation ducts (13); the flow passage (14) is formed between each two adjacent groups of the second ventilation ducts (13); The lower end of the second ventilation duct (13) extends to below the high-heat-generating device (41), and the extended end of the second ventilation duct (13) forms the first air outlet end (141) and the second air outlet end (142).

8. The electrical cabinet according to claim 7, characterized in that: A main air inlet duct (15) is also provided in the closed cavity (11), and the main air inlet duct (15) 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 plate of the cabinet (1); and the first heat exchange structure (2) is located above the air inlet of the main air inlet duct (15).

9. The electrical cabinet according to claim 6, characterized in that: The component group further comprises a third low-heat-generating device (44) and a fourth low-heat-generating device (45) arranged in the upper half of the closed cavity (11); the third low-heat-generating device (44) is bonded to the front end surface of the high-heat-generating device (41), and the fourth low-heat-generating device (45) is located in front of the third low-heat-generating device (44); A third fan (53) is provided in the closed cavity (11) at the rear of the second air outlet end (142); the third fan (53) is located at the rear and lower part of the third low-heat-generating device (44), with its air inlet side facing the second air outlet end (142) and its air outlet side facing the third low-heat-generating device (44) and the fourth low-heat-generating device (45).

10. The electrical cabinet according to claim 9, characterized in that A fourth fan (54) is further provided above the third low-heat-generating device (44) in the closed cavity (11), and an air outlet side of the fourth fan (54) faces the first internal circulation air return port (22); The fourth fan (54) is used to extract hot air that has passed through the third low-heat-generating device (44) and the fourth low-heat-generating device (45) and transport it to the first internal circulation return air outlet (22).

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