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 heat exchanger, a mounting base plate, a first electrical component and a flow guide fan. The cabinet body has a closed cavity; the heat exchanger is arranged on the side plate of the cabinet body and has an internal circulation air outlet and an internal circulation air return port; the mounting base plate is arranged in the closed cavity and faces the heat exchanger in a first direction; the first electrical component is located on the leeward side of the mounting base plate; and the air inlet end of the flow guide fan faces the internal circulation air outlet, and the air outlet end is aligned with the first electrical component. The electrical cabinet provided by the application can make part of the cold air directly pass to the first electrical component for heat dissipation under the guidance of the flow guide fan, so as to take away the heat of the first electrical component, solve the problem that the first electrical component deviating from the heat exchanger cannot dissipate heat, avoid the problem of local hot spots, and improve the overall heat dissipation effect of the electrical cabinet.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electrical equipment, and more particularly to an electrical cabinet. BACKGROUND

[0002] The electrical cabinet, such as a photovoltaic inverter and an energy storage converter, usually includes electrical components such as an inverter module, a reactance module and a capacitor busbar module. Since such an electrical cabinet is usually applied in a harsh environment with high temperature, high humidity and high dust, in order to protect the electrical components inside, the electrical cabinet is required to have high sealing performance and high protection grade, and therefore can only adopt a closed heat dissipation.

[0003] In the prior art, in order to dissipate heat for the electrical components inside the closed cabinet body, an air-to-air heat exchanger is arranged on the door panel of the electrical cabinet, heat conduction is formed by using the air-to-air heat exchanger, and the air flow inside the cabinet body is formed to circulate to take away the heat inside the electrical cabinet.

[0004] Since a plurality of electrical components are usually arranged inside the electrical cabinet, in order to meet the electrical connection and layout optimization requirements between the electrical components, the setting position of some electrical components deviates from the air outlet of the heat exchanger, so that the electrical components cannot dissipate heat, and there is a hot spot problem, resulting in poor overall heat dissipation effect of the electrical cabinet. SUMMARY

[0005] The purpose of the present application is to provide an electrical cabinet, which aims to solve the technical problems of the prior art that the electrical components deviating from the heat exchanger cannot dissipate heat and the electrical cabinet has a hot spot.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is to provide an electrical cabinet, comprising:

[0007] a cabinet body having a closed cavity; the cabinet body is defined to have a first direction, a second direction and a third direction, and the first direction, the second direction and the third direction are orthogonal to each other;

[0008] a heat exchanger arranged on the side plate of the cabinet body; the heat exchanger has an internal circulation air outlet and an internal circulation air return opening respectively facing the closed cavity; the internal circulation air outlet and the internal circulation air return opening are arranged in the third direction;

[0009] a mounting base plate arranged in the closed cavity and opposite to the heat exchanger in the first direction;

[0010] a first electrical component arranged in the closed cavity and located on the leeward side of the mounting base plate; and

[0011] a flow guide fan arranged in the closed cavity, with an air inlet end facing the internal circulation air outlet and an air outlet end aligned with the first electrical component;

[0012] Part of the cold air outputted by the inner circulation air outlet is guided to the first component by the air guide fan, and the air flow passing through the first component enters the heat exchanger from the inner circulation return air outlet.

[0013] In a possible implementation, the closed cavity is provided with a flow passage between the heat exchanger and the mounting base plate, and the flow passage extends along the first direction; the inner circulation air outlet is directed to an air inlet end of the flow passage, and the air inlet end of the air guide fan is directed to an air outlet end of the flow passage.

[0014] In some embodiments, in the third direction, the flow passage has a first end portion and a second end portion, the first end portion extends outward relative to the first component; the inner circulation air outlet is inclined to an air inlet end of the first end portion; and the air guide fan is located at an air outlet end of the first end portion.

[0015] In some embodiments, an end surface of the first end portion is blocked by a blocking plate.

[0016] In a possible implementation, in the third direction, an end of the mounting base plate close to the inner circulation return air outlet extends outward relative to the first component, and a through hole is arranged at the extended position; and the through hole is directed to the inner circulation return air outlet.

[0017] In the third direction, the flow passage has a first end portion and a second end portion, and the second end portion does not protrude from the extended end of the mounting base plate; and the through hole is in communication with the second end portion.

[0018] In some embodiments, the electrical cabinet further comprises:

[0019] A second component is opposite to the second end portion in the second direction; and the through hole is directed to the second component.

[0020] In some embodiments, a flow guide is arranged around the second component in the closed cavity, and the flow guide is used to guide part of the cold air outputted by the inner circulation air outlet to flow around the second component.

[0021] In some embodiments, the second component comprises an upper sub-component and a lower sub-component which are spaced apart along the third direction; the through hole is directed to the upper sub-component; and the upper sub-component has a greater heat generation than the lower sub-component.

[0022] In some embodiments, the second component is spaced apart into multiple phases along the second direction, and each phase of the second component is connected with a heat sink.

[0023] A plurality of groups of heat dissipation air ducts corresponding to the heat sinks are arranged in the closed cavity, and the heat sinks are arranged in the corresponding heat dissipation air ducts.

[0024] In a possible implementation, the third direction is a height direction of the cabinet body, and the inner circulation air outlet is located below the inner circulation air return port; and the first direction is a length direction of the cabinet body.

[0025] The electrical cabinet provided by the application has the advantages that, compared with the prior art, the closed cavity can meet the use requirements of high sealing performance and high protection level of the cabinet; the heat exchanger is used to absorb hot air in the closed cavity and output cold air into the closed cavity; although the first component is arranged on the leeward side of the mounting base and is away from the heat exchanger, the air inlet end of the air guide fan faces the inner circulation air outlet, and the air outlet end is aligned with the first component, so that part of the cold air can directly flow to the first component for heat dissipation under the guidance of the air guide fan, thereby removing the heat of the first component, avoiding the problem of local hot spots, and improving the overall heat dissipation effect of the electrical cabinet. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0027] Figure 1 Structure diagram of the electrical cabinet provided by the embodiment of the present application Figure 1 (the left side plate of the cabinet body is not shown in the figure);

[0028] Figure 2 Structure diagram of the electrical cabinet provided by the embodiment of the present application Figure 2 (the left side plate of the cabinet body is not shown in the figure);

[0029] Figure 3 Structure diagram of the electrical cabinet provided by the embodiment of the present application Figure 3 (the left side plate of the cabinet body is not shown in the figure);

[0030] Figure 4 Structure diagram of the electrical cabinet provided by the embodiment of the present application Figure 4 (the left side plate of the cabinet body is not shown in the figure);

[0031] Figure 5 Structure diagram of the second component of the electrical cabinet provided by the embodiment of the present application.

[0032] Fig.:

[0033] 1, cabinet; 11, closed cavity; 12, heat dissipation air duct; 13, overflow passage; 14, baffle;

[0034] 2, heat exchanger; 21, inner circulation air outlet; 22, inner circulation return air inlet; 23, outer circulation air inlet; 24, outer circulation air outlet; 25, air outlet fan;

[0035] 3, mounting base plate; 31, air passing hole;

[0036] 4, first component;

[0037] 5, flow guide fan;

[0038] 6, second component; 61, upper sub-component; 62, lower sub-component;

[0039] 7, air flow guide; 71, partition plate; 72, air guide plate. DETAILED DESCRIPTION

[0040] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly understood, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0041] In order to solve the above problems, please refer to Figures 1 to 4 , the electrical cabinet provided by the present application will be described. The electrical cabinet comprises a cabinet 1, a heat exchanger 2, a mounting base plate 3, a first component 4 and a flow guide fan. The cabinet 1 has a closed cavity 11; the cabinet 1 is defined to have a first direction, a second direction and a third direction, which are orthogonal to each other; the heat exchanger 2 is arranged on the side plate of the cabinet 1; the heat exchanger 2 has an inner circulation air outlet 21 and an inner circulation return air inlet 22 facing the closed cavity 11 respectively; the inner circulation air outlet 21 and the inner circulation return air inlet 22 are arranged along the third direction; the mounting base plate 3 is arranged in the closed cavity 11 and opposite to the heat exchanger 2 in the first direction; the first component 4 is arranged in the closed cavity 11 and located on the leeward side of the mounting base plate 3; the flow guide fan 5 is arranged in the closed cavity 11, the air inlet end faces the inner circulation air outlet 21, and the air outlet end is aligned with the first component 4;

[0042] Among them, part of the cold air output by the inner circulation air outlet 21 is guided to the first component 4 by the flow guide fan 5, and the air flow passing through the first component 4 enters the heat exchanger 2 from the inner circulation return air inlet 22 to exchange heat.

[0043] The cabinet body 1 is a cuboid structure, which is composed of a front side plate, a rear side plate, a left side plate, a rear side plate, an upper side plate, a lower side plate, and a support frame connecting and supporting the above-mentioned plates. The cabinet body 1 has a closed cavity 11, which can be understood as the above-mentioned six plates of the cabinet body 1 can surround the closed cavity 11, or the above-mentioned six plates of the cabinet body 1 cooperate with other sealing plates in the cabinet body 1 to surround the closed cavity 11. The closed cavity 11 is not communicated with the outside, so that the closed cavity 11 has high sealing performance and high protection level, can be applied in harsh environments such as high temperature, high humidity and high dust, and meets the use requirements of the power device group.

[0044] It should be noted that, Figures 1 to 4 The arrow A represents the first direction, the arrow B represents the second direction, and the arrow C represents the third direction.

[0045] Since the airflow forms a circulating flow in the closed cavity 11, and the airflow needs to pass through the heat exchanger 2 for heat exchange, in order to increase the path of the circulating flow of the airflow and reasonably distribute the layout position of the electrical element group, the sequential flow is generally in the length direction and the up-down direction of the closed cavity 11.

[0046] The heat exchanger 2 is preferably an air-to-air heat exchanger 2, which has a heat exchange core body. The heat exchanger 2 can introduce external cold air and also can recover hot air in the closed cavity 11. After the external cold air passes through the heat exchange core body, the heat of the hot air in the closed cavity 11 passing through the heat exchange core body is taken away, so as to reduce the temperature of the hot air. It should be noted that the external cold air and the hot air in the closed cavity 11 are separated, and they will not collide.

[0047] Specifically, the heat exchanger 2 has only one internal circulation air outlet 21 and one internal circulation air return port 22, and the internal circulation air outlet 21 and the internal circulation air return port 22 are both directed to the first direction, or slightly inclined relative to the first direction. The airflow passing through the first electrical element 4 enters the heat exchanger 2 from the internal circulation air return port 22, is cooled by the core body, and then enters the closed cavity 11 from the internal circulation air outlet 21. The heat exchanger 2 also has an external circulation air inlet 23 and an external circulation air outlet 24 directed to the outside. The external airflow enters the heat exchanger 2 from the external circulation air inlet 23, takes away the heat after passing through the core body to reduce the temperature of the core body, and then flows out of the heat exchanger 2 from the external circulation air outlet 24.

[0048] The mounting substrate 3 is used to assemble the first electrical element 4. The setting positions of the mounting substrate 3 and the first electrical element 4 are determined according to the positions of other electrical elements in the electrical cabinet. In order to meet the electrical connection requirements with other electrical elements, optimize the cable layout, and reasonably utilize the space of the closed cavity 11, in the first direction, the mounting substrate 3 is arranged on one side of the heat exchanger 2, and the first electrical element 4 is arranged on the leeward side of the mounting substrate 3. The side of the first electrical element 4 away from the mounting substrate 3 is electrically connected with other electrical elements through copper bars or wire harnesses.

[0049] Because the first energy component 4 is located on the leeward side of the mounting base 3, the cold air output from the internal circulation air outlet 21 is blocked by the mounting base 3 and cannot directly pass through the first energy component 4, resulting in a problem of heat dissipation from the first energy component 4. To address this layout issue, a guide fan 5 is arranged within the enclosed cavity 11, with the air inlet end of the guide fan 5 facing the internal circulation air outlet 21 and the air outlet end aligned with the first energy component 4.

[0050] The guide fan 5 is used to guide some of the cold air output from the internal circulation air outlet 21. Since the outlet of the guide fan 5 is oriented toward the first energy element 4, it can direct some of the cold air directly to the first energy element 4, removing the heat generated there. Furthermore, due to the inherent structural constraints of the heat exchanger 2, the airflow passing through the first energy element 4 can flow back to the internal circulation return air outlet 22, ultimately entering the heat exchanger 2 for heat exchange.

[0051] Compared with the prior art, the electrical cabinet provided by the present invention has a closed cavity 11 that can meet the use requirements of high sealing performance and high protection level of the cabinet; the heat exchanger 2 is used to absorb hot air in the closed cavity 11 and output cold air to the closed cavity 11; although the first energy component 4 is arranged on the leeward side of the mounting base plate 3, away from the heat exchanger 2, the air inlet end of the guide fan 5 faces the internal circulation air outlet 21, and the air outlet end is aimed at the first energy component 4. Under the guidance of the guide fan 5, part of the cold air can directly flow to the first energy component 4 for heat dissipation to take away the heat of the first energy component 4, thereby solving the problem that the first energy component 4 away from the heat exchanger 2 cannot dissipate heat, avoiding local hot spots, and improving the overall heat dissipation effect of the electrical cabinet.

[0052] There is a space between the mounting base 3 and the heat exchanger 2 to allow the cold air output from the internal circulation air outlet 21 to flow into the closed cavity 11. Since the guide fan 5 needs to guide part of the cold air to the first energy component 4, in order to accumulate the cold air and avoid the loss of cold energy, in some embodiments, the above-mentioned electrical cabinet can also adopt Figure 3 The structure shown, see Figure 3 A flow channel 13 is provided in the closed cavity 11, the flow channel 13 is located between the heat exchanger 2 and the mounting substrate 3, and the flow channel 13 extends along the first direction; the internal circulation air outlet 21 faces the air inlet end of the flow channel 13, and the air inlet end of the guide fan 5 faces the air outlet end of the flow channel 13.

[0053] The flow channel 13 extends along the first direction, and its air inlet end is completely aligned with the internal circulation air outlet 21. Most of the cold air output from the internal circulation air outlet 21 can be accumulated in the flow channel, thereby avoiding the air flow from being output from the internal circulation air outlet 21 and diffusing into the closed cavity 11 in a dispersed manner, causing cold loss.

[0054] The air inlet end of the air guide fan 5 is directed to the air outlet end of the flow passage 13, that is, the air inlet end of the air guide fan 5 is directed to the inner circulation air outlet 21 through the flow passage 13.

[0055] Preferably, in order to improve the air collection amount and air flow speed of the flow passage 13, the flow passage 13 can be spaced apart at least two along the second direction.

[0056] It should be noted that the flow passage 13 is a spatial structure, which can be enclosed by a plurality of partitions arranged in the closed cavity 11, or can be formed by means of the ventilation air duct or heat dissipation air duct 12 in the closed cavity 11. The specific structure of the flow passage 13 is not limited in the embodiment, as long as the flow passage 13 extends along the first direction and can accumulate cold air.

[0057] In some embodiments, in the third direction, the flow passage 13 has a first end portion and a second end portion, the first end portion extends outward relative to the first component 4; the inner circulation air outlet 21 is inclined to the air inlet end of the first end portion; and the air guide fan 5 is located at the air outlet end of the first end portion.

[0058] The inner circulation air outlet 21 is arranged to be inclined to the first end portion, and the cold air is output to be inclined to the first direction, so that part of the cold air is concentrated to pass through the first end portion. The air inlet end of the air guide fan 5 is directed to the air outlet end of the first end portion (that is, the air inlet end of the air guide fan 5 is directed to the inner circulation air outlet 21 through the first end portion). The air guide fan 5 just absorbs the cold air of the first end portion and directly blows to the first component 4 to dissipate heat for the first component 4.

[0059] It should be noted that the first end portion extends outward relative to the first component 4, which only means that it extends outward in the third direction. For example, the flow passage 13 is arranged along the up-down direction of the cabinet 1, that is, the third direction is the up-down direction of the cabinet 1, and then the lower end of the flow passage 13 extends downward relative to the first component 4.

[0060] In addition, the mounting base 3 not only provides a support base for the first component 4, but also is arranged to be attached to the first component 4. The lower end of the mounting base 3 is aligned with the lower end of the first component 4, and the mounting base 3 corresponds to the first end portion in the first direction. Therefore, part of the cold air passing through the first end portion will directly impact on the upper end of the mounting base 3, and the mounting base 3 can also absorb part of the cold air. Therefore, the mounting base 3 can act as a heat dissipation plate for the first component 4 to exchange heat with the first component 4, so as to increase the heat dissipation mode of the first component 4 and improve the heat dissipation efficiency of the first component 4.

[0061] In some embodiments, the flow passage 13 can also adopt a structure as shown in Figure 3 , which is described in detail in the following. Figure 3 In the third direction, the end face of the first end portion is blocked by the blocking plate 14.

[0062] Specifically, one end of the first end portion towards the heat exchanger 2 is an air inlet end, and the other end away from the heat exchanger 2 is an air outlet end. The airflow preferably flows along the air inlet end to the air outlet end of the first end portion when flowing through the first end portion.

[0063] By blocking the end face of the first end portion with the blocking plate 14, the flow passage 13 is blocked in the third direction, so that the cold air can only flow to the air outlet end of the flow passage 13, thereby avoiding the cold air flowing away from other parts of the first end portion and causing a loss of cold energy.

[0064] In some embodiments, the mounting base 3 described above can also adopt a structure as shown in Figure 4 , referring to Figure 4 , one end of the mounting base 3 close to the inner circulating air return port 22 extends outward relative to the first component 4, and the extended part is provided with an air passing hole 31; the air passing hole 31 faces the inner circulating air return port 22; in the third direction, the flow passage 13 has a first end portion and a second end portion, the second end portion does not protrude from the extended end of the mounting base 3; the air passing hole 31 communicates with the second end portion.

[0065] It should be noted that the above-mentioned one end of the mounting base 3 extending outward relative to the first component 4 only means extending outward in the third direction, for example, if the first component 4 is arranged along the up-down direction of the cabinet 1, then the upper end of the mounting base 3 extends upward relative to the first component 4.

[0066] The air passing hole 31 is provided at the extended part of the mounting base 3 to allow the airflow passing through the first component 4 and then return to the inner circulating air return port 22 through the second end portion. By using the above arrangement, the airflow path through the first component 4 can be optimized to ensure that the airflow can circulate around the heat exchanger 2. In addition, the accumulation of the airflow in the second end portion during the return process can also prevent the hot airflow from spreading into the closed cavity 11 and affecting the heat dissipation of other components.

[0067] In some embodiments, the electrical cabinet described above can also adopt a structure as shown in Figures 1 to 4 , referring to Figures 1 to 4 , the electrical cabinet further comprises a second component 6, the second component 6 corresponds to the second end portion in the second direction; the air passing hole 31 faces the second component 6. In the second direction, both ends of the mounting base 3 extend to the periphery of the second component 6.

[0068] The second component 6 corresponds to the second end portion in the second direction, which means that the second component 6 is arranged on the windward side of the mounting base 3, and the second component 6 corresponds to the heat exchanger 2 in the first direction. Part of the cold air output by the inner circulating air outlet 21 can directly pass to the second end portion and blow through the surface of the second component 6 to dissipate heat from the second component.

[0069] Moreover, the mounting substrate 3 is arranged between the second heat-generating component 6 and the first heat-generating component 4. The air flow passing through the second heat-generating component 6 hits the mounting substrate 3 and then flows back to the inner circulation air return port 22. On one hand, the mounting substrate 3 can block the air flow passing through the second heat-generating component 6 from passing through the first heat-generating component 4. On the other hand, the mounting substrate 3 can also reduce the distance between the first heat-generating component 4 and the second heat-generating component 6, so that the two components are more concentrated. In this way, the space of the closed cavity 11 can be fully utilized, and the electrical connection between the second heat-generating component 6 and the first heat-generating component 4 can be facilitated, and the cable layout can be optimized.

[0070] It should be noted that although the inner circulation air outlet 21 is inclined towards the first end portion, not all of the cold air can pass through the first end portion. The cold air is diffused, part of which flows towards the first end portion and part of which flows towards the second end portion. The cold air flowing towards the first end portion is directly blown to the first heat-generating component 4 under the action of the flow guide fan 5 to carry away the heat of the first heat-generating component 4. The cold air flowing towards the second end portion is directly blown to the second heat-generating component 6 to carry away the heat of the second heat-generating component 6. Therefore, the air flow passing through the second heat-generating component 6 and the air flow passing through the first heat-generating component 4 do not interfere with each other. Moreover, due to the structure of the heat exchanger 2, the air flow passing through the second heat-generating component 6 can flow back to the inner circulation air return port 22, and the air flow passing through the first heat-generating component 4 can also flow back to the inner circulation air return port 22. The two air flows finally enter the heat exchanger 2 for heat exchange.

[0071] Since the cold air directly flows through the second heat-generating component 6 and the first heat-generating component 4, the problem of local hot spots can be avoided, and the overall heat dissipation effect of the electrical cabinet can be improved.

[0072] By optimizing the positions of the heat dissipation air duct 12, the second heat-generating component 6, the inner circulation air outlet 21 and the flow guide fan 5, and based on the corresponding arrangement of the heat exchanger 2, the second heat-generating component 6, the mounting substrate 3 and the first heat-generating component 4 along the first direction, the cold air output by the inner circulation air outlet 21 can be naturally divided into two streams without interfering with each other, and the heat dissipation requirements of the first heat-generating component 4 and the second heat-generating component 6 can be met.

[0073] It should be noted that the heat generation of the second heat-generating component 6 is greater than that of the first heat-generating component 4. The air flow passing through the first heat-generating component 4 also enters the second end portion through the air flow hole 31 and blows through the second heat-generating component 6, further dissipating heat from the second heat-generating component 6.

[0074] Preferably, a flow guide 7 is arranged around the second heat-generating component 6 in the closed cavity 11. The flow guide 7 is used to guide part of the cold air output by the inner circulation air outlet 21 to flow around the second heat-generating component 6.

[0075] In order to ensure the air flow efficiency, the air flow guide 7 can be arranged at the periphery of the second air component 6, for guiding the air flow to form independent circulation flow around the second air component 6, without interfering with the air flow passing through the air guide fan 5. The air flow guide 7 can be in the form of fan combination, in the form of baffle combination for isolating the air guide channel, or in the form of fan combination plus baffle combination.

[0076] Specifically, the air flow guide 7 can be a plate body structure arranged in the flow passage 13, having a structure including a partition plate 71 and an air guide plate 72, as shown in Figure 5 The partition plate 71 is horizontally arranged in the gap between the first end and the heat exchanger 2, for partitioning the inner circulation air outlet 21 and the inner circulation air return port 22; the air guide plate 72 is connected with the partition plate 71 and horizontally arranged in the flow passage 12.

[0077] The partition plate 71 and the plurality of air guide plates 72 are in an integrated structure, and the plate surfaces of the partition plate 71 and the air guide plate 72 are perpendicular to the flow direction of the air flow output from the inner circulation air outlet 21. The partition plate 71 is used for partitioning the inner circulation air outlet 21 and the inner circulation air return port 22, to ensure that the air flow directly returns to the circuit, and can only flow to the second air component 6 after passing through the inner circulation air outlet 21. The air guide plate 72 is horizontally arranged in the flow passage 12, for partitioning the flow passage 12, so that the air flow can form circulation in the air guide channel, increase the air flow path, and improve the heat dissipation efficiency of the second air component 6.

[0078] In some embodiments, the above-mentioned second air component 6 can adopt the structure as shown in Figure 1 and Figure 4 , referring to Figure 1 and Figure 4 , the second air component 6 includes an upper sub-air component 61 and a lower sub-air component 62 which are spaced apart along a third direction; the air flow passage 31 is directed towards the upper sub-air component 61; the heat generation of the upper sub-air component 61 is greater than that of the lower sub-air component 62.

[0079] For the second air component 6, the air flow circulating flow passing through the flow passage 13 blows against the entire heat generating outer surface thereof, and the air flow passing through the air flow passage 31 blows against part of the surface thereof, so the amount of air received by the part of the second air component 6 corresponding to the air flow passage 31 is greater than that received by other parts. In order to reasonably utilize the air flow in different spaces, the second air component 6 is divided into the upper sub-air component 61 and the lower sub-air component 62 in this embodiment, and the upper sub-air component 61 with greater heat generation is corresponded to the front and back of the air flow passage 31. Then, the upper sub-air component 61 can receive the air flow of the two air flow circulating flows, although the heat generation of the upper sub-air component 61 is large, the amount of air received thereby is also large, thereby ensuring the uniform heat dissipation of the second air component 6 as a whole.

[0080] In some embodiments, the above-mentioned second air component 6 can also adopt the structure as shown in Figure 3 andFigure 5 As shown in the structure, refer to Figure 3 and Figure 5 The second electrical component 6 is spaced along the second direction and has multiple phases, and each phase of the second electrical component 6 is attached with a radiator; the closed cavity 11 is also provided with multiple groups of heat dissipation air ducts 12 corresponding to the radiators, and the radiators are located in the corresponding heat dissipation air ducts 12; a flow passage 13 is formed between each adjacent two groups of heat dissipation air ducts 12.

[0081] The second electrical component 6 is the main power device for realizing the function of the electrical cabinet, and is provided with multiple phases to increase the output power of the electrical cabinet. The multiple-phase second electrical component 6 is spaced along the second direction, and the main heat-emitting outer surface of each phase of the second electrical component 6 is parallel to the first direction.

[0082] Since the multiple-phase second electrical component 6 is spaced, a flow passage 13 can be formed between each adjacent two heat dissipation air ducts 12, and there is also a ventilation gap between the outermost second electrical component 6 and the side plate of the cabinet 1. Each flow passage 13 is in communication with the internal circulation air outlet 21 and the internal circulation air return 22. Part of the cold air output by the internal circulation air outlet 21 blows against the heat-emitting outer surface of each phase of the second electrical component 6 through each flow passage 13 and the ventilation gap, carries away the heat, and ensures uniform heat dissipation of each phase of the second electrical component 6.

[0083] Since the second electrical component 6 is the main power device, it generates a large amount of heat. In order to further improve the heat dissipation efficiency, the second electrical component 6 is equipped with a separate radiator. The radiator is attached to the second electrical component 6, and the radiator can carry away the heat generated by the second electrical component 6.

[0084] Specifically, the radiator includes multiple spaced heat dissipation fins. The radiator is generally a low-protection-grade device and does not need to be arranged in the closed cavity 11. In addition, the radiator needs to be continuously supplied with cold air to absorb heat. Therefore, the radiator is arranged in the heat dissipation air duct 12, and the heat dissipation air duct 12 is also located in the closed cavity 11 but is in communication with the outside (the air inlet and air outlet of the heat dissipation air duct 12 are arranged on the side plate of the cabinet 1). The outside cold air is directly blown to the radiator in the heat dissipation air duct 12 to carry away the heat of the second electrical component 6. It should be noted that since the radiator is hidden in the heat dissipation air duct 12, the specific structure and position of the radiator are not shown in the figure.

[0085] This embodiment reasonably utilizes the self-structure of the heat dissipation of the second electrical component 6, so that multiple spaced heat dissipation air ducts 12 form multiple flow passages 13, without the need for additional baffles to form flow passages 13, which simplifies the layout of the electrical components inside the cabinet and avoids interference with the electrical components.

[0086] In some embodiments, the cabinet 1 described above can adopt the structure as shown in Figures 1 to 4 , refer toFigure 1 and Figure 4 The third direction is the height direction of the cabinet 1, and the inner circulation air outlet 21 is located below the inner circulation air return 22; the first direction is the length direction of the cabinet 1, and the second direction is the width direction of the cabinet 1.

[0087] Since the air flow needs to form a circulation flow in the closed cavity 11 and needs to pass through the heat exchanger 2 for heat exchange, in order to increase the path of the circulation flow, the circulation flow is generally in the length direction and the up-down direction of the closed cavity 11. Then, in order to adapt to the structure of the closed cavity 11 and the path of the circulation flow, the heat exchanger 2, the second air component 6 and the first air component 4 are distributed along the length direction of the cabinet 1, the heat exchanger 2 is arranged on the side plate perpendicular to the width direction of the cabinet 1, and the heat exchanger 2 is arranged along the height direction of the cabinet 1.

[0088] It should be noted that, Figures 1 to 4 The arrow A represents the first direction, the arrow B represents the second direction, and the arrow C represents the third direction.

[0089] Specifically, the heat exchanger 2 in the embodiment is arranged on the rear side plate of the cabinet 1, can be blocked by the cabinet 1, and the outer circulation air inlet 23 and the outer circulation air outlet 24 are both towards the rear of the cabinet 1, and will not affect the operation of the front control panel of the cabinet 1.

[0090] The inner circulation air outlet 21 and the inner circulation air return 22 are both towards the front side plate of the cabinet 1, and the inner circulation air return 22 is only one, and the inner circulation air outlet 21 is also only one.

[0091] The inner circulation air return 22 is located above the inner circulation air outlet 21, which conforms to the flow trend of the natural sinking of cold air. The outer circulation air inlet 23 is located below the outer circulation air outlet 24, which conforms to the flow trend of the natural rising of hot air.

[0092] Preferably, in order to ensure the air outlet efficiency, an air outlet fan 25 is arranged at the inner circulation air outlet 21.

[0093] The above only describes the preferred embodiments of the present application and should not be used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electrical cabinet, characterized in that The electrical cabinet comprises: a cabinet body (1) having a closed cavity (11); the cabinet body (1) is defined to have a first direction, a second direction and a third direction, and the first direction, the second direction and the third direction are orthogonal to each other; a heat exchanger (2) arranged on a side plate of the cabinet body (1); the heat exchanger (2) has an inner circulation air outlet (21) and an inner circulation air return port (22) respectively facing the closed cavity (11); the inner circulation air outlet (21) and the inner circulation air return port (22) are arranged in the third direction; a mounting base plate (3) arranged in the closed cavity (11) and opposite to the heat exchanger (2) in the first direction; a first component (4) arranged in the closed cavity (11) and located on the leeward side of the mounting base plate (3); a flow guide fan (5) arranged in the closed cavity (11), the air inlet end of the flow guide fan (5) faces the inner circulation air outlet (21), and the air outlet end of the flow guide fan (5) is aligned with the first component (4); wherein part of the cold air output by the inner circulation air outlet (21) is guided to the first component (4) through the flow guide fan (5), and the air flow passing through the first component (4) enters the heat exchanger (2) for heat exchange through the inner circulation air return port (22). The closed cavity (11) is provided with an overflow passage (13) between the heat exchanger (2) and the mounting base plate (3), and the overflow passage (13) extends in the first direction; the inner circulation air outlet (21) faces the air inlet end of the overflow passage (13), and the air inlet end of the flow guide fan (5) faces the air outlet end of the overflow passage (13).

2. The electrical cabinet of claim 1, wherein, In the third direction, the overflow passage (13) has a first end and a second end, the first end extends outward relative to the first component (4); the inner circulation air outlet (21) is inclined to the air inlet end of the first end; the flow guide fan (5) is located at the air outlet end of the first end.

3. The electrical cabinet of claim 2, wherein, The end face of the first end is blocked by a blocking plate (14).

4. The electrical cabinet of claim 3, wherein, In the third direction, one end of the mounting base plate (3) close to the inner circulation air return port (22) extends outward relative to the first component (4), and an air passing hole (31) is arranged at the extending position; the air passing hole (31) faces the inner circulation air return port (22); 5. The electrical cabinet of claim 2, wherein, In the third direction, the overflow passage (13) has a first end and a second end, and the second end does not protrude from the extending end of the mounting base plate (3); the air passing hole (31) communicates with the second end. The electrical cabinet further comprises:

6. The electrical cabinet of claim 5, wherein, a second component (6) opposite to the second end in the second direction; the air passing hole (31) faces the second component (6). A flow guide member (7) is arranged around the second component (6) in the closed cavity (11), and the flow guide member (7) is used for guiding part of the cold air output by the inner circulation air outlet (21) to flow around the second component (6).

7. The electrical cabinet of claim 6, wherein, ​ 8. The electrical cabinet of claim 7, wherein, The second component (6) comprises upper and lower sub-components (61, 62) spaced apart along the third direction; the air passing hole (31) faces the upper sub-component (61); the upper sub-component (61) generates more heat than the lower sub-component (62).

9. The electrical cabinet of claim 6, wherein, The second component (6) is spaced apart along the second direction and has multiple phases, and each phase of the second component (6) is connected with a radiator. The closed cavity (11) is further provided with multiple groups of heat dissipation air ducts (12) corresponding to the radiators, and the radiators are located in the corresponding heat dissipation air ducts (12); each adjacent two groups of heat dissipation air ducts (12) form the flow passing channel (13).

10. The electrical cabinet of claim 1, wherein, The third direction is the height direction of the cabinet (1), and the inner circulation air outlet (21) is located below the inner circulation air return port (22); the first direction is the length direction of the cabinet (1).

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