Electrical cabinet heat dissipation structure and electrical cabinet

Abstract

The utility model provides an electrical cabinet heat radiation structure and an electrical cabinet, which belong to the technical field of electrical equipment and comprise a cabinet body, a heat exchanger, a first fan and a second fan. The cabinet body is provided with a closed cavity; the heat exchanger is arranged at the upper half part of the rear side plate of the cabinet body; the heat exchanger is provided with an internal circulation air outlet and an internal circulation air return port, the internal circulation air outlet and the internal circulation air return port both face the front side plate of the cabinet body, and the internal circulation air outlet is located below the internal circulation air return port; the first fan is arranged at the front lower part of the internal circulation air outlet, and the air outlet end faces the lower side plate of the cabinet body; the second fan is arranged at the front lower corner point of the closed cavity, and the air inlet end faces the rear side plate of the cabinet body. According to the utility model, the first fan is matched with the second fan, so that cold air output by the heat exchanger can circularly flow in the closed cavity, an airflow flowing path is enlarged, and the heat of an area far away from the heat exchanger in the closed cavity can be dissipated, so that the problem of local hot spots is avoided, and the overall heat dissipation effect of the electrical cabinet is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electrical equipment technical field, more specifically, relate to a kind of electrical cabinet heat dissipation structure and electrical cabinet. BACKGROUND

[0002] Certain electrical cabinet can be applied in high temperature, high humidity, high dust and other harsh environment, in order to protect the internal electrical device, require that electrical cabinet has high sealing performance and high protection level, therefore only to the electrical cabinet closed heat dissipation is used.

[0003] In prior art, in order to dissipate heat for electrical device inside closed cabinet, air-to-air heat exchanger is arranged on the door panel of electrical cabinet, and heat conduction is formed by using air-to-air heat exchanger to take away the heat inside electrical cabinet. However, for high-power electrical cabinet, multiple electrical devices are usually arranged inside, including high-heat devices with large heat and low-heat devices with small heat, so that the internal space is large, and especially the area far away from air-to-air heat exchanger will have local hot spot problem, resulting in poor overall heat dissipation effect of electrical cabinet. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of electrical cabinet heat dissipation structure and electrical cabinet, to solve the technical problems of local hot spot in high-power electrical cabinet inside and poor heat dissipation effect in prior art.

[0005] To achieve the above-mentioned purpose, in the first aspect, the utility model embodiment provides a kind of electrical cabinet heat dissipation structure, comprising:

[0006] Cabinet body, with closed cavity;

[0007] Heat exchanger, arranged in the upper half of the back panel of the cabinet body; the heat exchanger has internal circulation air outlet and internal circulation air return, and the internal circulation air outlet and the internal circulation air return are both towards the front panel of the cabinet body, and the internal circulation air outlet is below the internal circulation air return;

[0008] First fan, arranged below the internal circulation air outlet, and the air outlet end is towards the lower panel of the cabinet body; and

[0009] Second fan, arranged at the front lower corner point of the closed cavity, and the air inlet end is towards the back panel of the cabinet body.

[0010] In a possible implementation manner, the inner side of the front panel of the cabinet body is provided with a sealing plate, and the sealing plate and the front panel of the cabinet body form a vertical channel;

[0011] The air inlet end of the vertical channel is communicated with the air outlet end of the second fan; and the air outlet end of the vertical channel is above the air inlet end of the vertical channel;

[0012] The hot air flowing through the vertical channel can exchange heat through the front side plate of the cabinet body.

[0013] In some embodiments, the electrical cabinet heat dissipation structure further comprises:

[0014] A third fan is arranged in the closed cavity and located above the second fan, and the air outlet end is directed towards the internal circulation air return port.

[0015] In some embodiments, the air inlet end of the third fan is aligned with the air outlet end of the vertical channel.

[0016] With reference to the first aspect, in a possible implementation manner, the first fan is a speed-regulated fan.

[0017] With reference to the first aspect, in a possible implementation manner, a fourth fan is connected at the internal circulation air outlet port, and the air outlet end of the fourth fan is inclined downward.

[0018] The electrical cabinet heat dissipation structure has the following beneficial effects compared with the prior art: the heat exchanger is arranged on the upper half of the rear side plate of the cabinet body, the first fan is arranged below the internal circulation air outlet port of the heat exchanger and has an air outlet end directed towards the lower side plate of the cabinet body, the second fan is arranged at the front lower corner point of the closed cavity and has an air inlet end directed towards the rear side plate of the cabinet body, the first fan cooperates with the second fan to enable the cold air output by the heat exchanger to flow through the rear lower half, the front lower half and the front upper half of the closed cavity in sequence, increase the airflow flow path, and dissipate heat from the front lower area of the closed cavity away from the heat exchanger, thereby avoiding the problem of local hot spots and improving the overall heat dissipation effect of the electrical cabinet.

[0019] Secondly, the utility model embodiment further provides an electrical cabinet, which comprises:

[0020] The electrical cabinet heat dissipation structure described above; and

[0021] A low heat generating device group is arranged on the air conveying path of the first fan and the second fan.

[0022] With reference to the second aspect, in a possible implementation manner, the low heat generating device group comprises:

[0023] A first low heat generating device is located at the rear lower half of the closed cavity and aligned with the air outlet end of the first fan;

[0024] A second low heat generating device is located at the front lower half of the closed cavity and aligned with the air inlet end of the second fan; and

[0025] A third low heat generating device is located at the front upper half of the closed cavity and located above the second fan.

[0026] With the second aspect, in a possible implementation manner, the electrical cabinet further includes:

[0027] The multi-phase high heat generating device is arranged in the closed cavity along the left-right direction of the cabinet body and is located in front of the heat exchanger, and a radiator is connected to each phase of the high heat generating device;

[0028] The closed cavity is further provided with a plurality of groups of heat dissipation air ducts corresponding to the radiators, and the radiators are located in the corresponding heat dissipation air ducts; a flow passage is formed between each adjacent two groups of heat dissipation air ducts; the inner circulation air outlet faces each flow passage; and the first fan is arranged at the lower end of the plurality of flow passages and communicates with each flow passage.

[0029] In some embodiments, the lower end of each flow passage is further blocked by a blocking plate.

[0030] The electrical cabinet provided by the utility model has the advantages that compared with the prior art, the electrical cabinet heat dissipation structure of the utility model has the advantages that the cold air output by the heat exchanger can form a circulating flow in the closed cavity, heat can be dissipated from the area far away from the heat exchanger in the closed cavity, local hot spot problems can be avoided, and the overall heat dissipation effect of the electrical cabinet is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0032] Figure 1 The structure diagram of the energy storage inverter cabinet provided by the utility model embodiment Figure 1 (the left side plate of the cabinet body is not shown in the figure);

[0033] Figure 2 The structure diagram of the energy storage inverter cabinet provided by the utility model embodiment Figure 2 (the left side plate of the cabinet body is not shown in the figure);

[0034] Figure 3 The structure diagram of the energy storage inverter cabinet provided by the utility model embodiment Figure 3 (the left side plate of the cabinet body is not shown in the figure).

[0035] In the figure:

[0036] 1, cabinet; 11, closed cavity; 12, closing plate; 13, vertical channel; 14, heat dissipation air duct; 15, baffle;

[0037] 2, heat exchanger; 21, inner circulation air outlet; 22, inner circulation air return; 23, outer circulation air inlet; 24, outer circulation air outlet;

[0038] 31, first fan; 32, second fan; 33, third fan; 34, fourth fan;

[0039] 41, first low heat generating device; 42, second low heat generating device; 43, third low heat generating device; 44, high heat generating device. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical schemes and beneficial effects of the utility model clearer and more apparent, the utility model 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 utility model and do not limit the utility model.

[0041] Please refer to Figure 1 and Figure 2 , the electrical cabinet heat dissipation structure provided by the utility model will be described. The electrical cabinet heat dissipation structure comprises a cabinet 1, a heat exchanger 2, a first fan 31 and a second fan 32. The cabinet 1 has a closed cavity 11; the heat exchanger 2 is arranged on the upper half of the rear panel of the cabinet 1; the heat exchanger 2 has an inner circulation air outlet 21 and an inner circulation air return 22, both of which are directed towards the front panel of the cabinet 1, and the inner circulation air outlet 21 is located below the inner circulation air return 22; the first fan 31 is arranged below the front of the inner circulation air outlet 21, and the air outlet end is directed towards the lower panel of the cabinet 1; the second fan 32 is arranged at the front lower corner of the closed cavity 11, and the air inlet end is directed towards the rear panel of the cabinet 1.

[0042] The cabinet 1 is a rectangular structure composed of a front panel, a rear panel, a left panel, a rear panel, an upper panel, a lower panel and a support frame connecting and supporting the above-mentioned panels. The cabinet 1 has a closed cavity 11, which can be understood as the above-mentioned six panels of the cabinet 1 can form a closed cavity 11, or the above-mentioned six panels of the cabinet 1 cooperate with other closing plates 12 in the cabinet 1 to form a closed cavity 11. The closed cavity 11 is not connected with the outside, so that the closed cavity 11 has high sealing performance and high protection level, which can make the electrical cabinet be applied in harsh environments such as high temperature, high humidity and high dust, and meet the use requirements of power device group.

[0043] The heat exchanger 2 is preferably an air-to-air heat exchanger 2, having a heat exchange core, and the heat exchanger 2 can introduce external cold air and can also recover hot air in the closed cavity 11; the external cold air passes through the heat exchange core and takes away the heat of the hot air in the closed cavity 11 passing through the heat exchange core, thereby reducing the temperature of the hot air. It should be noted that the external cold air and the hot air flowing in the closed cavity 11 are separated and will not collide.

[0044] The first fan 31 cooperates with the second fan 32 to make the air flow pass through the heat exchanger 2 and form a circulating flow in the closed cavity 11. In order to increase the path of the circulating flow and reasonably distribute the layout position of the electrical devices in the closed cavity 11, the circulating flow is generally in the length direction and the up-down direction of the closed cavity 11.

[0045] In order to cooperate with the circulating flow of the air, the heat exchanger 2 is arranged on the side plate parallel to the width direction. The heat exchanger 2 has only one internal circulating air outlet 21 and one internal circulating air return port 22, and the air flow in the closed cavity 11 enters the heat exchanger 2 through the internal circulating air return port 22, and after being cooled by the heat exchange core, it enters the closed cavity 11 from the internal circulating air outlet 21.

[0046] The heat exchanger 2 is arranged on the rear side plate of the cabinet 1. It should be noted that the above-mentioned front-rear-left-right direction is defined with the front door panel of the cabinet 1 as the reference basis after the cabinet 1 is installed. Generally, the cabinet 1 is provided with a front door panel (i.e. a front side plate), which can be opened to maintain the electrical devices. The front door panel is also provided with an operation panel.

[0047] Since the heat exchanger 2 is preferably arranged on the side plate parallel to the width direction, it can be understood that the panel surface of the rear side plate is perpendicular to the length direction of the cabinet 1, and the panel surfaces of the left and right side plates are perpendicular to the width direction of the cabinet 1.

[0048] It should be noted that the heat exchanger 2 also has an external circulating air inlet 23 and an external circulating air outlet 24 respectively facing the outside, and the external circulating air inlet 23 is located below the external circulating air outlet 24.

[0049] Specifically, the circulating air flow in the closed cavity 11 enters the heat exchanger 2 through the internal circulating air return port 22, is cooled by the core, and then enters the closed cavity 11 from the internal circulating air outlet 21. The external air flow enters the heat exchanger 2 from the external circulating air inlet 23, takes away heat after passing through the core to reduce the temperature of the core, and then flows out of the heat exchanger 2 from the external circulating air outlet 24.

[0050] The internal circulating air return port 22 is located above the internal circulating air outlet 21, which conforms to the flow trend of the natural sinking of cold air. The external circulating air inlet 23 is located below the external circulating air outlet 24, which conforms to the flow trend of the natural rising of hot air.

[0051] The first fan 31 is arranged below the front of the inner circulation air outlet 21 and has an air outlet end facing the lower side plate of the cabinet 1, and is used for guiding the cold air output by the inner circulation air outlet 21 to the rear lower half of the cabinet 1; the second fan 32 is arranged at the front lower corner point of the closed cavity 11 and has an air inlet end facing the rear side plate of the cabinet 1, and is used for absorbing the cold air in the rear lower half of the cabinet 1 to the front lower half of the cabinet 1; according to the principle of air dynamics that hot air flows upward and cold air flows downward, the air current absorbing the heat of the electrical device flows upward from the front lower half of the cabinet 1 to the front upper half of the cabinet 1, and is affected by the heat exchanger 2 and then flows back to the inner circulation air return port 22, so as to form a flow track of downward, forward, upward and rearward.

[0052] Compared with the prior art, the heat exchanger 2 is arranged on the upper half of the rear side plate of the cabinet 1, the first fan 31 is arranged below the front of the inner circulation air outlet 21 of the heat exchanger 2 and has an air outlet end facing the lower side plate of the cabinet 1, the second fan 32 is arranged at the front lower corner point of the closed cavity 11 and has an air inlet end facing the rear side plate of the cabinet 1, and the first fan 31 cooperates with the second fan 32, so that the cold air output by the heat exchanger 2 flows through the rear lower half, the front lower half and the front upper half of the closed cavity 11 in sequence, the air flow path is increased, the front lower area of the closed cavity 11 far away from the heat exchanger 2 can be cooled, so that the problem of local hot spots is avoided, and the overall heat dissipation effect of the electrical cabinet is improved.

[0053] In some embodiments, the electrical cabinet heat dissipation structure can also adopt a structure as shown in Figure 3 , referring to Figure 3 , the inner side of the front side plate of the cabinet 1 is provided with an enclosing plate 12, the enclosing plate 12 and the front side plate of the cabinet 1 form a vertical channel 13, the air inlet end of the vertical channel 13 is communicated with the air outlet end of the second fan 32, the air outlet end of the vertical channel 13 is located above the air inlet end of the vertical channel 13, and the hot air flowing through the vertical channel 13 can be heat-exchanged through the front side plate of the cabinet 1.

[0054] The enclosing plate 12 is located behind the front side plate of the cabinet 1, and the enclosing plate 12 and the front side plate of the cabinet 1 can form the vertical channel 13, the air inlet end of the vertical channel 13 is below the air outlet end, and the vertical channel 13 conforms to the natural tendency of hot air flowing upward.

[0055] Due to the air suction of the first air suction fan, a negative pressure is formed in the lower space of the cabinet 1, so that the air current in the lower half flows forward, and the first air suction fan can also send part of the heated air current into the vertical channel 13, since the front side plate of the cabinet 1 directly faces the outside, the air current can transfer heat to the outside through the front side plate when passing through the vertical channel 13, so as to reduce the temperature of the air current backflow and improve the heat exchange efficiency.

[0056] The air flow is cooled by the vertical passage 13, and then flows back to the inner circulation return air outlet 22. Since the air outlet end of the vertical passage 13 is located above the air inlet end of the vertical passage 13, the height position of the air outlet end of the vertical passage 13 can be reasonably determined to change the return air path of the air flow circulation, so that the heat dissipation can be reasonably performed according to the heat generation requirement of the electrical device in the upper half of the closed cavity 11.

[0057] In some embodiments, the above-mentioned electrical cabinet heat dissipation structure further comprises a third fan 33, which is arranged in the closed cavity 11 and located above the second fan 32, and the air outlet end is directed to the inner circulation return air outlet 22. The third fan 33 is used to extract the air flow flowing through the front lower half of the closed cavity 11 upward, and send the air to the heat exchanger 2. The third fan 33 is arranged above the second fan 32, which is used to accelerate the air flow speed and improve the heat dissipation efficiency of the air flow circulation.

[0058] Preferably, referring to Figs. 1 and 2, Figure 1 and Figure 3 , the air inlet end of the third fan 33 is aligned with the air outlet end of the vertical passage 13.

[0059] Specifically, the circulating air flow in the closed cavity 11 can be divided into two groups. In the first circulation, the second fan 32 extracts air to form a negative pressure in the lower half of the closed cavity 11, so that the air flow flows downward and forward, and part of the heated air flows upward and is guided to the heat exchanger 2 under the disturbance of the third fan 33.

[0060] In the second circulation, the second fan 32 extracts air to form a negative pressure in the lower half of the closed cavity 11, so that the air flow flows downward and forward, and the second fan 32 sends part of the heated air to the vertical passage 13. After the air flow passes through the vertical passage 13, it is guided to the heat exchanger 2 under the extraction of the third fan 33.

[0061] Aligning the air inlet end of the third fan 33 with the air outlet end of the vertical passage 13 can further accelerate the air flow speed and flow rate in the vertical passage 13, and improve the heat exchange efficiency.

[0062] In some embodiments, the above-mentioned inner circulation air outlet 21 can adopt the structure as shown in Figs. 1 and 2, Figure 1 and Figure 2 , referring to Figs. 1 and 2, Figure 1 and Figure 2 , a fourth fan 34 is connected at the inner circulation air outlet 21, and the air outlet end of the fourth fan 34 is inclined downward.

[0063] The fourth fan 34 is used to increase the air outlet speed and air outlet volume of the inner circulation air outlet 21. The air outlet end of the fourth fan 34 is inclined downward, and part of the cold air can directly pass to the upper half of the closed cavity 11 to directly cool the electrical devices in the upper half of the closed cavity 11; and part of the cold air can pass to the rear lower half of the closed cavity 11 under the action of the first fan 31, and pass to the inner circulation air return port 22 for heat exchange under the cooperation of the second fan 32 and the third fan 33.

[0064] It should be noted that a flow guide structure can be additionally arranged in the rear upper half of the closed cavity 11, and the flow guide structure can enable the air flow to form independent circulation flow in the rear upper half and not interfere with the air flow passing through the first fan 31.

[0065] In some embodiments, the first fan 31 is a speed-regulating fan. The speed-regulating fan is electrically connected to the electrical control system of the electrical cabinet, and the air suction volume of the speed-regulating fan can be controlled according to the temperature of different regions in the closed cavity 11.

[0066] Specifically, temperature sensors are arranged in the rear lower half, the front lower half, the rear upper half and the front upper half of the closed cavity 11 respectively, for monitoring the temperature of each region of the closed cavity 11 and transmitting the monitoring data to the control system of the electrical cabinet; and the control system controls the air suction speed of the first fan 31 according to the temperature monitoring value.

[0067] If the monitored temperature value of the rear upper half is higher than the preset value of the rear upper half, the control system controls the air suction speed of the first fan 31 to decrease, and correspondingly, the air volume output by the inner circulation air outlet 21 to the front upper half increases; if the monitored temperature of the front lower half and / or the rear lower half is higher than the preset value of the front lower half and / or the rear lower half, the control system controls the air suction speed of the first fan 31 to increase, and correspondingly, the air volume output by the inner circulation air outlet 21 to the rear lower half increases.

[0068] Based on the same inventive concept, the embodiments of the present application also provide an electrical cabinet comprising the above-mentioned electrical cabinet heat dissipation structure and low-heat-emission device group. The low-heat-emission device group is arranged on the air conveying path of the first fan 31 and the second fan 32.

[0069] Compared with the prior art, the electrical cabinet heat dissipation structure of the present application can enable the cold air output by the heat exchanger 2 to form circulation flow in the closed cavity 11 under the cooperation of the first fan 31 and the second fan 32, can dissipate heat from the regions in the closed cavity 11 far away from the heat exchanger 2, thereby avoiding the problem of local hot spots and improving the overall heat dissipation effect of the electrical cabinet.

[0070] In some embodiments, the above-mentioned low-heat-emission device group can adopt the structure as shown in Figure 1 and Figure 3 The low-heat-emission device group can adopt the structure as shown in Figure 1and Figure 3 The low-heating device group includes a first low-heating device 41, a second low-heating device 42, and a third low-heating device 43. The first low-heating device 41 is located in the lower rear half of the enclosed cavity 11 and is aligned with the air outlet of the first fan 31; the second low-heating device 42 is located in the lower front half of the enclosed cavity 11 and is aligned with the air inlet of the second fan 32; the third low-heating device 43 is located in the upper front half of the enclosed cavity 11 and is located above the second fan 32.

[0071] Since the first low-heat-generating device 41 is located upstream of the second low-heat-generating device 42, the heat generated by the first low-heat-generating device 41 is less than that generated by the second low-heat-generating device 42. As for the third low-heat-generating device 43, although it is located upstream of the second low-heat-generating device 42, it is also close to the air outlet of the vertical channel 13. The third low-heat-generating device 43 can dissipate heat through the airflow after heat exchange via the vertical channel 13; therefore, the heat generated by the third low-heat-generating device 43 can be less than that generated by the second low-heat-generating device 42.

[0072] The first low-heating device 41 is directly opposite the air outlet of the first fan 31, and cold air can be directly directed to the first low-heating device 41. Since the heat generation of the first low-heating device 41 is relatively small, the temperature rise range after the cold air passes through it is small; the second low-heating device 42 is directly opposite the air inlet of the second fan 32, and the second low-heating device 42 can also receive cold air with a relatively low temperature.

[0073] By rationally arranging the low-heat-generating device group according to the positions of the first fan 31, the second fan 32, and the vertical channel 13, the heat dissipation efficiency of the low-heat-generating device group is improved, and local hot spots are avoided.

[0074] In some embodiments, the above-mentioned electrical cabinet may also employ, for example... Figure 1 , Figure 2 and Figure 3 The structure shown is described in the following document. Figure 1 , Figure 2 and Figure 3 The electrical cabinet also includes multiphase high-heat-generating devices 44; the multiphase high-heat-generating devices 44 are arranged at intervals in the closed cavity 11 along the left and right directions of the cabinet 1 and are located directly in front of the heat exchanger 2; each phase high-heat-generating device 44 is attached to a radiator.

[0075] The enclosed cavity 11 is also provided with multiple sets of heat dissipation air ducts 14 corresponding to the heat sinks, and the heat sinks are located in the corresponding heat dissipation air ducts 14; a flow passage is formed between each pair of adjacent sets of heat dissipation air ducts 14; the internal circulation air outlet 21 faces each flow passage; the first fan 31 is set at the lower end of the multiple flow passages and is connected to each flow passage.

[0076] The high heat generating device 44 is a 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 high heat generating device 44 is distributed along the left-right direction of the cabinet body 1, and the main heat generating outer surface of each phase of the high heat generating device 44 is parallel to the front-rear direction of the cabinet body 1.

[0077] Since the multiple-phase high heat generating device 44 is distributed at intervals, a flow passage is formed between each adjacent two heat dissipation air ducts 14, and a ventilation space is also present between the leftmost high heat generating device 44 and the left side plate of the cabinet body 1. Each flow passage is in communication with the internal circulation air outlet 21 and the internal circulation air return 22, respectively. Part of the cold air output by the internal circulation air outlet 21 blows against the heat generating outer surface of each phase of the high heat generating device 44 through each flow passage and the ventilation space, thereby taking away the heat and ensuring uniform heat dissipation for each phase of the high heat generating device 44.

[0078] It should be noted that a flow guide structure can be arranged at the upper rear half of the closed cavity 11, which can make the air flow circulate around the multiple-phase high heat generating module in the upper rear half to form an independent circulation flow, without interfering with the air flow returned by the first fan 31. The flow guide structure is used to guide the air flow to circulate around the surface of each phase of the high heat generating device 44. The flow guide structure can be in the form of a fan combination, or in the form of a baffle combination to isolate an air guide passage, or in the form of a fan combination plus a baffle combination.

[0079] Since the high heat generating device 44 is a main power device, it generates a large amount of heat. In order to further improve the heat dissipation efficiency, the high heat generating device 44 is provided with a separate heat sink, which is arranged in close contact with the high heat generating device 44. The heat sink can take away the heat generated by the high heat generating device 44.

[0080] Specifically, the heat sink includes a plurality of heat dissipation fins arranged at intervals. The heat sink is generally a low protection grade device, and does not need to be arranged in the closed cavity 11. Moreover, the heat sink needs to be constantly supplied with cold air to absorb heat. Therefore, the heat sink is arranged in the heat dissipation air duct 14, which 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 14 are arranged on the side plates of the cabinet body 1). The outside cold air is directly blown to the heat sink in the heat dissipation air duct 14 to take away the heat of the high heat generating device 44. It should be noted that since the heat sink is hidden in the heat dissipation air duct 14, the specific structure and position of the heat sink are not shown in the figure.

[0081] Preferably, the air inlet of the heat dissipation air duct 14 is arranged on the rear side plate of the cabinet body 1, and the air outlet is arranged on the top plate and / or the front side plate of the cabinet body 1. Moreover, the air inlet of the heat dissipation air duct 14 is located below the heat exchanger 2.

[0082] The inner circulation air outlet 21 is directed to each flow passage, the flow passage plays a role of collecting air flow, and avoids air flow from the inner circulation air outlet 21 to be dispersedly diffused into the closed cavity 11 after being output, thereby causing cold loss; the first fan 31 is arranged directly below the plurality of flow passages, and directly extracts part of cold air in each flow passage.

[0083] In some embodiments, the flow passage can also adopt a structure as shown in Figure 2 , and the lower end of each flow passage is further blocked by a blocking plate 15. Figure 2

[0084] Specifically, one end (i.e. rear end) of the flow passage directed to the heat exchanger 2 is an air inlet end, and the other end (i.e. front end) of the flow passage directed away from the heat exchanger 2 is an air outlet end, and the air flow preferably flows along the air inlet end to the air outlet end of the flow passage when flowing through the surface of the high heat generating device 44.

[0085] By blocking the blocking plate 15 at the lower end of each flow passage, the blocking plate 15 and the first fan 31 are combined to jointly block the flow passage, part of the cold air can only be extracted downward by the first fan 31, and part of the cold air can only flow to the air outlet end of the flow passage, thereby avoiding the cold air from flowing away from the lower end of the flow passage, and causing cold loss.

[0086] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.​

Claims

1. An electric cabinet heat dissipation structure, characterized in that, The application relates to an electrical cabinet heat dissipation structure. The cabinet body (1) has a closed cavity (11); a heat exchanger (2) is arranged at the upper half of the rear side plate of the cabinet body (1); the heat exchanger (2) has an inner circulation air outlet (21) and an inner circulation air return (22), both of which are directed towards the front side plate of the cabinet body (1), and the inner circulation air outlet (21) is located below the inner circulation air return (22); a first fan (31) is arranged below the front of the inner circulation air outlet (21) and has an air outlet end directed towards the lower side plate of the cabinet body (1); and a second fan (32) is arranged at the front lower corner of the closed cavity (11) and has an air inlet end directed towards the rear side plate of the cabinet body (1). The inner side of the front side plate of the cabinet body (1) is provided with a sealing plate (12) which, together with the front side plate of the cabinet body (1), forms a vertical channel (13); the air inlet end of the vertical channel (13) is communicated with the air outlet end of the second fan (32); the air outlet end of the vertical channel (13) is located above the air inlet end of the vertical channel (13); and the hot air flowing through the vertical channel (13) can be heat-exchanged through the front side plate of the cabinet body (1). The electrical cabinet heat dissipation structure further comprises a third fan (33) arranged in the closed cavity (11) and located above the second fan (32) and having an air outlet end directed towards the inner circulation air return (22). The air inlet end of the third fan (33) is aligned with the air outlet end of the vertical channel (13). The first fan (31) is a speed-adjustable fan.

2. The electrical cabinet heat dissipation structure of claim 1, wherein, A fourth fan (34) is connected at the inner circulation air outlet (21) and has an air outlet end inclined downward. The application relates to an electrical cabinet heat dissipation structure. The low-heat-emission device group comprises a first low-heat-emission device (41) located at the rear lower half of the closed cavity (11) and aligned with the air outlet end of the first fan (31); a second low-heat-emission device (42) located at the front lower half of the closed cavity (11) and aligned with the air inlet end of the second fan (32); and a third low-heat-emission device (43) located at the front upper half of the closed cavity (11) and located above the second fan (32).

3. The electrical cabinet heat dissipation structure of claim 2, wherein, The electrical cabinet further comprises a multi-phase high-heat-emission device (44) arranged in the closed cavity (11) along the left-right direction of the cabinet body (1) and located in front of the heat exchanger (2); and a radiator is connected to each of the high-heat-emission devices (44). ​ 4. The electrical cabinet heat dissipation structure of claim 3, wherein, ​ 5. The electrical cabinet heat dissipation structure of claim 1, wherein, ​ 6. The electrical cabinet heat sink structure of claim 1, wherein, ​ 7. An electrical cabinet, characterized in that ​ ​ ​ 8. The electrical cabinet of claim 7, wherein, ​ ​ ​ ​ 9. The electrical cabinet of claim 7, wherein, ​ ​ The closed cavity (11) is further provided with a plurality of groups of heat dissipation air ducts (14) corresponding to the heat sinks, and the heat sinks are located in the corresponding heat dissipation air ducts (14); each adjacent two groups of heat dissipation air ducts (14) form a flow passage; the inner circulation air outlet (21) faces each flow passage; and the first fan (31) is arranged at the lower end of the plurality of flow passages and communicates with each flow passage.

10. The electrical cabinet of claim 9, wherein, The lower end of each flow passage is further blocked by a blocking plate (15).

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