Air duct heat dissipation structure, power converter and cabinet

Abstract

The utility model discloses an air duct heat dissipation structure, a power converter and a cabinet, the air duct heat dissipation structure comprises a first air duct, a second air duct and at least one fan, and the first air duct and the second air duct are stacked in a first direction; the side wall of the first air duct comprises at least two first ventilation openings, the at least two first ventilation openings are arranged in the second direction, and each first ventilation opening is used for arranging one power module; the second direction is perpendicular to the first direction; the second air duct comprises at least one second ventilation opening, the fan is arranged at the second ventilation opening, and the fan drives air to flow in the area between the first ventilation opening and the second ventilation opening in the operation process. As the at least two power modules are both located in the air flowing area between the first ventilation opening and the second ventilation opening, the air duct heat dissipation structure can achieve centralized heat dissipation of the at least two power modules, a fan is fully utilized, the demand for the fan is reduced, and therefore the heat dissipation cost of the power modules is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, and particularly relates to an air duct heat dissipation structure, a power converter and a cabinet machine. BACKGROUND

[0002] At present, in the power converter, the heat dissipation of the power module in which the capacitor and the power module (IGBT) are concentrated together is relatively dispersed, and the number of fans used is relatively large and the heat dissipation cost is high.

[0003] Therefore, how to reduce the heat dissipation cost of the power module has become a technical problem to be solved by the person skilled in the art. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an air duct heat dissipation structure, a power converter and a cabinet machine to reduce the heat dissipation cost of the power module.

[0005] In order to achieve the above-mentioned purpose, the present application discloses the following technical solutions:

[0006] In a first aspect, the present application provides an air duct heat dissipation structure for heat dissipation of a power module, the air duct heat dissipation structure comprising a first air duct, a second air duct and at least one fan,

[0007] The first air duct and the second air duct are arranged in a stack in a first direction and are in communication;

[0008] The side wall of the first air duct comprises at least two first air vents, the at least two first air vents are arranged in a second direction, each first air vent is used to arrange one power module; and the second direction is perpendicular to the first direction.

[0009] The second air duct comprises at least one second air vent, the fan is arranged at the second air vent, and in the running process of the fan, the fan drives air to flow in the area between the first air vent and the second air vent.

[0010] In some embodiments, both side walls of the first air duct are provided with at least two first air vents.

[0011] In some embodiments, the first air duct is located at the top wall of the second air duct.

[0012] In some embodiments, the top wall of the first air duct has a third air vent.

[0013] In some embodiments, the first air duct and the second air duct are both cuboid structures.

[0014] In some embodiments, the width of the second air duct is greater than the width of the first air duct.

[0015] In some embodiments, the air duct heat dissipation structure further comprises a heat exchanger, the heat exchanger is arranged at the air inlet side of the fan or the air outlet side of the fan.

[0016] In a second aspect, the present application provides a power converter, comprising at least two power modules and the air duct heat dissipation structure according to any one of the above, the power modules are arranged one by one corresponding to the first air vents of the air duct heat dissipation structure.

[0017] In some embodiments, the first air duct heat dissipation structure is arranged with the first air vents on both sides, the first air vents on both sides are symmetrically arranged on both sides of the first air duct; the power modules are symmetrically arranged on both sides of the first air duct.

[0018] In some embodiments, the top wall of the first air duct has a third air vent, and the DC bus of the power converter is arranged at the third air vent.

[0019] In some embodiments, the power module comprises a box, at least two capacitors, at least two power modules and a module bus, the at least two capacitors are concentrated on one side of the inside of the box, and the at least two power modules are concentrated on the other side of the inside of the box; the two side walls opposite to the capacitors of the box are respectively provided with an air inlet and an air outlet, the air outlet corresponds to the first air vent; the module bus is led out of the box and connected to the DC bus.

[0020] In a third aspect, the present application provides a cabinet air conditioner, comprising a cabinet and the air duct heat dissipation structure according to any one of the above, during the operation of the fan of the air duct heat dissipation structure, the area between the cabinet and the air duct heat dissipation structure forms a circulating air path.

[0021] As can be seen from the above technical solutions, when the fan is running, the inside of the first air duct and the second air duct forms a negative pressure, air can enter the inside of the first air duct and the second air duct through the first air vent, and flow out of the outside through the second air vent, and the outside air flows to the first air vent. Since the at least two first air vents are arranged along the second direction, and the first air duct and the second air duct are arranged in the first direction, under the premise of arranging the power modules at the at least two first air vents, the at least two power modules are arranged in the second direction, which is equivalent to that the at least two power modules are located in the air flow area, and the concentrated heat dissipation of the at least two power modules can be realized by using the air duct heat dissipation structure, and the fan is fully utilized, so that the demand for the fan is reduced, thereby reducing the heat dissipation cost of the power module. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise stated, the same reference numbers in the drawings represent the same structure or operation.

[0023] Figures 1 to 3 A perspective view of a wind channel heat dissipation structure in three angles provided by the embodiment of the present application;

[0024] Figure 4 And Figure 5 An air circulation schematic view of a wind channel heat dissipation structure provided by the embodiment of the present application;

[0025] Figure 6 A schematic view of a cabinet machine provided by the embodiment of the present application;

[0026] Figure 7 A perspective view of a power converter provided by the embodiment of the present application;

[0027] Figure 8 A perspective view of a wind channel heat dissipation structure and a power module combined together provided by the embodiment of the present application;

[0028] Figure 9 A Figure 8 enlarged view of part A in FIG. 6;

[0029] Figure 10 A perspective view of a power module provided by the embodiment of the present application;

[0030] Figure 11 A Figure 10 enlarged view of part B in FIG. 7;

[0031] Figure 12 A perspective view of a power module with hidden busbar provided by the embodiment of the present application;

[0032] Figure 13 An air circulation schematic view of a wind channel heat dissipation structure in a power converter provided by the embodiment of the present application;

[0033] In the drawings: 100-wind channel heat dissipation structure; 200-power module; 300-direct current busbar; 400-cabinet body;

[0034] 110-first wind channel; 120-second wind channel; 130-fan; 140-heat exchanger;

[0035] 111 - first air vent; 112 - third air vent; 113 - mounting; 110a - top wall; 110c - first side wall; 110d second side wall; 110e - third side wall; 110e - fourth side wall; 113a - mounting hole;

[0036] 121 - second air vent; 120a - top wall; 120b - bottom wall; 120c - first side wall; 120d second side wall; 120e - third side wall; 120e - fourth side wall;

[0037] 210 - box; 220 - capacitor; 230 - power module; 240 - module bus; 250 - handle; 260 - connecting piece;

[0038] 211 - air inlet; 212 - air outlet; 213 - first connecting column; 214 - second connecting column; 210a - first side plate; 210b - second side plate; 210c - third side plate; 210d - third side plate;

[0039] 221 - first capacitor electrode; 222 - second capacitor electrode;

[0040] 231 - first power electrode; 222 - second power electrode;

[0041] 241 - first module bus; 242 - second module bus; 243 - third module bus; 244 - first connecting part; 245 - second connecting part; 241a - first capacitor wiring hole; 241b - second capacitor wiring hole; 242a - first power wiring hole; 242b - second power wiring hole; 243a - first DC bus wiring hole; 243b - second DC bus wiring hole;

[0042] 240a - first module bus layer; 240b - second module bus layer; 240c - first module insulation layer; 240d - second module insulation layer; 300a - first DC bus layer; 241b - second DC bus layer; 241c - DC insulation layer;

[0043] 261 - connecting hole;

[0044] 410 - longitudinal beam; 420 - cross beam; 430 - connecting beam. DETAILED DESCRIPTION

[0045] The application will be described in further detail below with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the scope of the application. The embodiments described are only a part of the embodiments of the application and are not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.

[0046] In order to reduce the heat dissipation cost of the power module, the application specifically introduces the structure of the air duct heat dissipation structure in combination with the drawings:

[0047] Referring to Figures 1 to 4 In order to achieve the above purpose, the application discloses the following technical solutions:

[0048] An air duct heat dissipation structure 100 for heat dissipation of a power module 200, the air duct heat dissipation structure 100 comprising a first air duct 110, a second air duct 120 and at least one fan 130, the first air duct 110 and the second air duct 120 being arranged in a stack in a first direction and being in communication; a side wall of the first air duct 110 comprising at least two first air vents 111, the at least two first air vents 111 being arranged in a second direction, each first air vent 111 being used to arrange one power module 200; the second direction being perpendicular to the first direction; the second air duct 120 comprising at least one second air vent 121, the fan 130 being arranged at the second air vent 121, and the fan 130 driving air to flow in the area between the first air vent 111 and the second air vent 121 during operation.

[0049] Under the driving of the fan 130, the air inside the first air duct 110 and the second air duct 120 can flow from the first air vent 111 to the second air vent 121, and the air outside the first air duct 110 and the second air duct 120 can flow from the second air vent 121 to the first air vent 111; under the driving of the fan 130, the air inside the first air duct 110 and the second air duct 120 can flow from the second air vent 121 to the first air vent 111, and the air outside the first air duct 110 and the second air duct 120 can flow from the first air vent 111 to the second air vent 121. The above can be adjusted by selecting the type of the fan 130 to adjust the air inlet side and the air outlet side of the fan 130.

[0050] Taking the first mode as an example, when the fan 130 operates, the inside of the first air duct 110 and the second air duct 120 forms a negative pressure, air enters the inside of the first air duct 110 and the second air duct 120 from the first air vent 111, and flows out of the outside from the second air vent 121, and the outside air flows to the first air vent 111 again. Since the at least two first air vents 111 are arranged along the second direction, and the first air duct 110 and the second air duct 120 are arranged along the first direction, and under the premise that the at least two power modules 200 are arranged at the at least two first air vents 111, the at least two power modules 200 are arranged along the second direction, which is equivalent to that the at least two power modules 200 are located in the air flow area, and the concentrated heat dissipation of the at least two power modules 200 can be realized by using the air duct heat dissipation structure 100, and the fan 130 is fully utilized, so that the demand for the fan 130 is reduced, thereby reducing the heat dissipation cost of the power module 200.

[0051] Herein, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features.

[0052] It should be noted that the first air duct 110 and the second air duct 120 are independent and sealed air duct structures, and since the power module 200 is arranged in the flow area between the first air vent 111 and the second air vent 121, the power module 200 can be precisely heat-dissipated, and the reliability is higher, thereby reducing the heat dissipation cost from another aspect.

[0053] In addition, the amount of air entering the first air duct 110 and the second air duct 120 can be adjusted to adjust the heat dissipation amount of the power module 200, for example, by increasing the number of fans 130, adjusting the power of the fan 130, and the like.

[0054] The air duct heat dissipation structure 100 has a length direction, a width direction and a height direction, which correspond to the length, the width and the height of the air duct heat dissipation structure 100 in sequence. Therefore, the first direction can be understood as the height direction, and the second direction can be the length direction or the width direction; the first direction can also be understood as the length direction, and the second direction can be the width direction or the height direction; the first direction can also be understood as the width direction, and the second direction can be the length direction or the height direction.

[0055] The first direction is taken as the height direction, and the second direction is taken as the length direction as an example for introduction, and other modes can be referred to this mode.

[0056] The first air duct 110 is mainly used for arranging the power module 200, and the second air duct 120 is mainly used for arranging the fan 130. In order to facilitate the arrangement of the above structure, the first air duct 110 and the second air duct 120 are both cuboid structures

[0057] Specifically, the first air duct 110 includes a top wall 110a, a bottom wall, and four side walls, which are a first side wall 110c, a second side wall 110d, a third side wall 110e, and a fourth side wall 110f. The first side wall 110c is arranged opposite to the second side wall 110d, and the third side wall 110e is arranged opposite to the fourth side wall 110f. The top wall 110a is located at the top end of the first side wall 110c, the second side wall 110d, the third side wall 110e, and the fourth side wall 110f, and the bottom wall is located at the bottom end of the first side wall 110c, the second side wall 110d, the third side wall 110e, and the fourth side wall 110f. In the illustration, the first side wall 110c and the second side wall 110d are arranged opposite in the width direction, and the third side wall 110e and the fourth side wall 110f are arranged opposite in the length direction. In another example, the first side wall 110c and the second side wall 110d are arranged opposite in the length direction, and the third side wall 110e and the fourth side wall 110f are arranged opposite in the width direction. The first air vent 111 can be arranged on any of the above side walls (the first side wall 110c, the second side wall 110d, the third side wall 110e, and the fourth side wall 110f).

[0058] The second air duct 120 includes a top wall 120a, a bottom wall 120b, and four side walls, which are a first side wall 120c, a second side wall 120d, a third side wall 120e, and a fourth side wall 120f. The first side wall 120c is arranged opposite to the second side wall 120d, and the third side wall 120e is arranged opposite to the fourth side wall 120f. The top wall 120a is located at the top end of the first side wall 120c, the second side wall 120d, the third side wall 120e, and the fourth side wall 120f, and the bottom wall 120b is located at the bottom end of the first side wall 120c, the second side wall 120d, the third side wall 120e, and the fourth side wall 120f. In the illustration, the first side wall 120c and the second side wall 120d are arranged opposite in the width direction, and the third side wall 120e and the fourth side wall 120f are arranged opposite in the length direction. In another example, the first side wall 120c and the second side wall 120d are arranged opposite in the length direction, and the third side wall 120e and the fourth side wall 120f are arranged opposite in the width direction. The second air vent 121 can be arranged on any of the above side walls (the first side wall 120c, the second side wall 120d, the third side wall 120e, and the fourth side wall 120f), the top wall 120a, and the bottom wall 120b.

[0059] In an example, in the height direction, the first air duct 110 is located above the second air duct 120, the first air duct 110 is located on the top wall 120a of the second air duct 120, and at this time the first air duct 110 can omit the bottom wall; in another example, in the height direction, the first air duct 110 is located below the second air duct 120, the first air duct 110 is located on the bottom wall 120b of the second air duct 120, and at this time the first air duct 110 can omit the top wall 110a.

[0060] In order to improve the space utilization of the above-mentioned air duct heat dissipation structure 100 of the present application, at least two first air vents 111 are arranged on each of the two side walls of the first air duct 110. Specifically, the two side walls are opposite two side walls, and air flow is formed on both sides of the first air duct 110.

[0061] In the illustration, eight first air vents 111 are arranged on the two side walls of the first air duct 110 in the length direction, and eight air flows are formed on one side of the first air duct 110 in the length direction, and eight air flows are formed on the other side of the first air duct 110 in the length direction. Eight power modules 200 are arranged on one side of the first air duct 110, and eight power modules 200 are arranged on the other side of the first air duct 110. It should be noted that the number, size, shape, etc. of the first air vents 111 can be changed according to the number of power modules 200.

[0062] The DC bus 300 for connecting the power modules 200 is connected from the top to the power modules 200, and considering the heat dissipation of the DC bus 300, in some examples of the present application, the top wall 110a of the first air duct 110 has a third air vent 112, and the third air vent 112 is used to arrange the DC bus 300 to dissipate heat for the DC bus 300. The number, shape and relative position of the third air vent 112 can be designed according to the actual needs to meet the heat dissipation needs of the DC bus 300. The third air vent 112→the second air vent 121→the third air vent 112 forms another air flow. The flow direction of the air flow in the first air duct 110 and the second air duct 120 is consistent with that of the first air vent 111→the second air vent 121→the first air vent 111, which can reduce the generation of turbulence and reduce resistance, thereby improving the heat dissipation efficiency, as shown in Figure 5 .

[0063] Since the fan 130 is arranged on the second air duct 120, the pressure of the air entering the first air duct 110 and the second air duct 120 on the second air vent 121 is reduced. In the present application, the cross-sectional area of the second air duct 120 in the height direction is greater than the cross-sectional area of the first air duct 110 in the height direction. In particular, the length of the first air duct 110 is equal to the length of the second air duct 120, and the width of the second air duct 120 is greater than the width of the first air duct 110. The air entering the first air duct 110 can be temporarily buffered in the second air duct 120. In addition, the width of the second air duct 120 is greater than the width of the first air duct 110, which can also support the power module 200 and improve the connection strength of the power module 200.

[0064] In addition, in the above-mentioned air duct heat dissipation structure 100, the first air duct 110 is arranged on both sides of the first air duct 110, and the first air vent 111 on both sides is symmetrically arranged on both sides of the first air duct 110. The power module 200 is symmetrically arranged on both sides of the first air duct 110. In other words, the structure composed of the first air duct 110 and the second air duct 120 is a symmetrical structure.

[0065] In order to improve the heat dissipation efficiency of the air duct heat dissipation structure 100, the air duct heat dissipation structure 100 further comprises a heat exchanger 140, which is arranged on the air inlet side of the fan 130 or the air outlet side of the fan 130. It should be noted that the air inlet side of the fan 130 is arranged close to the second air vent 121, and the air outlet side of the fan 130 is coaxially arranged with the air inlet side, i.e. the fan 130 is an axial flow fan 130. The use of an axial flow fan 130 can reduce the occupied volume of the fan 130.

[0066] The number of fans 130 in the diagram is three, and the three fans 130 are arranged along the length direction. The number of the above-mentioned fans 130 can also be one, two, four, etc.

[0067] In order to realize the installation of the air duct heat dissipation structure 100 and the cabinet 400, the air duct heat dissipation structure 100 can comprise a mounting hole 113a and / or a mounting member 113 for mounting on the cabinet 400. The mounting hole 113a and / or the mounting member 113 can be provided on the first air duct 110 and / or the second air duct 120.

[0068] Referring to Figure 6 The present application also discloses a cabinet machine comprising a cabinet 400 and the above-mentioned air duct heat dissipation structure 100. During the operation of the fan 130 of the air duct heat dissipation structure 100, the area between the cabinet 400 and the air duct heat dissipation structure 100 forms a circulating air path. Since the above-mentioned air duct heat dissipation structure 100 has the above-mentioned beneficial effects, the cabinet machine comprising the air duct heat dissipation structure 100 has corresponding effects, which will not be described here.

[0069] It should be noted that the cabinet machine can be applied to power converters, switch devices and other electrical equipment.

[0070] Taking the cabinet machine applied to the power converter as an example, referring to Figure 7 and Figure 8 The application provides a power converter, which comprises at least two power modules 200 and the air duct heat dissipation structure 100 according to any one of the above, and the power modules 200 are arranged one by one corresponding to the first air vents 111 of the air duct heat dissipation structure 100. The air duct heat dissipation structure 100 according to any one of the above. Since the air duct heat dissipation structure 100 has the above beneficial effects, the power converter comprising the air duct heat dissipation structure 100 has corresponding effects, which will not be described here.

[0071] The air duct heat dissipation structure 100 integrated with the power module 200 is arranged on the cabinet body 400 of the power converter through the connecting beam 430, and the cabinet body 400 can comprise a plurality of longitudinal beams 410 and transverse beams 420, the longitudinal beams 410 and the transverse beams 420 are arranged vertically to form a support frame of the cabinet body 400. The connecting beam 430 can be arranged on the opposite longitudinal beams 410 or the opposite transverse beams 420 to realize the connection between the air duct heat dissipation structure 100 and the cabinet body 400, which will not be described here.

[0072] It should be noted that the power module 200 is a module in which the capacitor 220 and the power module (IGBT) 230 are combined together. Referring to Figures 9 to 12 The application discloses a structure of the power module 200, which comprises a box body 210, at least two capacitors 220, at least two power modules 230 and a module bus 240, the at least two capacitors 220 are concentrated on one side of the inside of the box body 210, and the at least two power modules 230 are concentrated on the other side in the box body 210; the two side walls of the box body 210 opposite to the capacitors 220 are respectively provided with air inlets 211 and air outlets 212, and the air outlet 212 corresponds to the first air vent 111; the module bus 240 is led out of the box body 210 and connected to the direct-current bus 300 correspondingly.

[0073] The box 210 is used to support the capacitors 220, the power modules 230, etc., and comprises a first side plate 210a, a second side plate 210b, a third side plate 210c and a fourth side plate 210d, wherein the first side plate 210a and the second side plate 210b are oppositely arranged, and the third side plate 210c and the fourth side plate 210d are oppositely arranged. In the illustration, the first side plate 210a and the second side plate 210b are oppositely arranged in the width direction, and the third side plate 210c and the fourth side plate 210d are oppositely arranged in the height direction. In order to facilitate the installation of the power module 200, in some examples, the box 210 further comprises a handle 250, which can be arranged on any side plate (the first side plate 210a, the second side plate 210b, the third side plate 210c and the fourth side plate 210d).

[0074] Under the premise that the first air duct 110 is arranged above the second air duct 120, at least two capacitors 220 are arranged on the upper side inside the box 210, at least two power modules 230 are arranged on the lower side inside the box 210, the module bus 240 of the power module 200 is led out from the upper side of the box 210, and the drive bus of the power module 200 is led out from the lower side of the box 210.

[0075] In some examples, the air inlet 211 is arranged on the first side plate 210a, the air outlet 212 is arranged on the second side plate 210b, and the air inlet 211 and the air outlet 212 correspond to the capacitors 220. In other examples, the air inlet 211 is arranged on the third side plate 210c, and the air outlet 212 is arranged on the fourth side plate 210d.

[0076] In order to facilitate the connection of the power module 200 and the cabinet 400, the power module 200 further comprises a connecting piece 260, which can be detachably connected with the side plate of the box 210, or can be non-detachably connected, and the connecting piece 260 comprises a connecting hole 261, through which the power module 200 is connected with the cabinet 400 (the cross beam 420, the longitudinal beam 410 and the connecting beam 430).

[0077] The module bus 240 can be divided into a first module bus 241, a second module bus 242 and a third module bus 243 according to different connected components, wherein the first module bus 241 is used for connecting with the capacitor 220, the second module bus 242 is used for connecting with the power module 230, and the third module bus 243 is used for connecting with the DC bus 300. The module bus 240 can be divided into a first module bus layer 240a and a second module bus layer 240b according to the positive and negative poles connected, the first module bus 241 and the second module bus layer 240b are arranged in a stack, and the two are insulated by a first module insulation layer 240c, and the two are insulated from the cabinet 210 by a second module insulation layer 240d, the first module bus layer 240a is used for connecting the positive pole, and the second module bus layer 240b is used for connecting the negative pole.

[0078] In order to realize the positioning between the module bus 240 and the cabinet 210, the cabinet 210 can include a first positioning column 213 and a second positioning column 214, and correspondingly, the module bus 240 includes a first connecting part 244 and a second connecting part 245, the first connecting part 244 is connected with the first positioning column 213 by a fastener, and the second connecting part 245 is connected with the second positioning column 214 by a fastener, in order to improve the uniformity of stress at the connection between the module bus 240 and the cabinet 210, the first positioning column 213 is located at the position where the capacitor 220 is arranged in the cabinet 210, and the second positioning column 214 is located at the position where the power module 230 is arranged.

[0079] The capacitor 220 includes a positive pole and a negative pole, wherein one of the positive pole and the negative pole is defined as a first capacitor electrode 221, and the other is defined as a second capacitor electrode 222. The first module bus 241 includes at least two first capacitor wiring holes 241a and second capacitor wiring holes 241b, wherein the first capacitor wiring holes 241a realize electrical connection with the first capacitor electrode 221, and the second capacitor wiring holes 241b realize electrical connection with the second capacitor electrode 222.

[0080] The power module 230 includes a gate, an emitter and a collector, wherein one of the emitter and the collector is defined as a first power electrode 231, and the other is defined as a second power electrode 232. The second module bus 242 includes at least two first power wiring holes 242a and at least two second power wiring holes 242b, wherein the first power wiring holes 242a realize electrical connection with the first power electrode 231, and the second power wiring holes 242b realize electrical connection with the second power electrode 232.

[0081] The DC bus 300 can realize the electrical connection of the plurality of power modules 200, specifically, the power modules 200 connected on both sides of the first air duct 110. The DC bus 300 includes a first DC bus layer 300a and a second DC bus layer 300b, the first DC bus layer 300a and the second DC bus layer 300b are arranged in a stack, and are insulated from each other by a DC insulation layer 300c. The third module bus 243 includes at least two first DC bus connection holes 243a and second DC bus connection holes 243b, wherein the first DC bus connection holes 243a realize the electrical connection with the first DC bus layer 300a, and the second DC bus connection holes 243b realize the electrical connection with the second DC bus layer 300b, as shown in Figure 9 and Figure 11 .

[0082] When the air duct cooling structure 100 includes the third air vent 112, the DC bus 300 of the power converter is arranged at the third air vent 112.

[0083] Referring to Figure 13 , when the fan 130 is running, the inside of the first air duct 110 and the second air duct 120 forms a negative pressure, a part of the air enters the inside of the first air duct 110 and the second air duct 120 through the first air vent 111, and another part of the air enters the inside of the first air duct 110 and the second air duct 120 through the third air vent 112 and flows out of the outside through the second air vent 121. A part of the outside air flows through the capacitor 220 through the air inlet 211, and flows to the first air vent 111 again through the air outlet 212 and the first air vent 111, thereby realizing the air cooling of the capacitor 220; a part of the outside air flows through the DC bus 300, and flows to the first air vent 111 again through the third air vent 112, thereby realizing the air cooling of the DC bus 300. Since the at least two first air vents 111 are arranged in the second direction, and the first air duct 110 and the second air duct 120 are arranged in the first direction, under the premise that the power modules 200 are arranged at the at least two first air vents 111, the at least two power modules 200 are arranged in the second direction, which is equivalent to that the at least two power modules 200 are located on the circulating air path, and the air duct cooling structure 100 can realize the concentrated cooling of the at least two power modules 200, and the fan 130 is fully utilized, thereby reducing the demand for the fan 130, thereby reducing the cooling cost of the power module 200.

[0084] The above description is only the preferred embodiment of the present application and the explanation of the technical principles of the application, and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. The application scope involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by the combinations of the above technical features or their equivalent features without departing from the above application concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the present application (but not limited to) with similar functions.

Claims

1. A wind channel heat dissipation structure for heat dissipation of a power module, characterized in that, The air duct heat dissipation structure comprises a first air duct, a second air duct and at least one fan, The first air duct and the second air duct are arranged in a stack in a first direction and are in communication; The side walls of the first air duct comprise at least two first air vents, and the at least two first air vents are arranged in a second direction, and each first air vent is used for arranging one power module; The second direction is perpendicular to the first direction; The second air duct comprises at least one second air vent, the fan is arranged at the second air vent, and the fan drives air to flow in the area between the first air vent and the second air vent during operation.

2. The air duct heat dissipation structure according to claim 1, wherein Both side walls of the first air duct are provided with at least two first air vents.

3. The air duct heat dissipation structure according to claim 1, wherein The first air duct is located at the top wall of the second air duct.

4. The air duct heat dissipation structure according to claim 3, wherein The top wall of the first air duct has a third air vent.

5. The air duct heat dissipation structure according to claim 1, wherein The first air duct and the second air duct are both cuboid structures.

6. The air duct heat dissipation structure according to claim 5, wherein The width of the second air duct is greater than the width of the first air duct.

7. The air duct heat dissipation structure according to any one of claims 1 to 6, wherein The air duct heat dissipation structure further comprises a heat exchanger, and the heat exchanger is arranged at the air inlet side of the fan or the air outlet side of the fan.

8. A power converter, characterized by, The air duct heat dissipation structure comprises at least two power modules and the air duct heat dissipation structure according to any one of claims 1 to 3 and 5 to 7, and the power modules are arranged in one-to-one correspondence with the first air vents of the air duct heat dissipation structure.

9. The power converter of claim 8, wherein, The first air duct of the air duct heat dissipation structure is provided with first air vents on both sides, and the first air vents on both sides are symmetrically arranged on both sides of the first air duct; and the power modules are symmetrically arranged on both sides of the first air duct.

10. The power converter of claim 9, wherein, The top wall of the first air duct has a third air vent, and a DC bus of the power converter is arranged at the third air vent.

11. The power converter of claim 10, wherein, The power module comprises a box body, at least two capacitors, at least two power modules and a module bus, the at least two capacitors are concentrated on one side of the inside of the box body, and the at least two power modules are concentrated on the other side of the inside of the box body; the two side walls of the box body opposite to the capacitors are respectively provided with an air inlet and an air outlet, the air outlet corresponds to the first air vent; the module bus is led out of the box body and connected to the DC bus in correspondence.

12. A cabinet machine characterized by, The air duct heat dissipation structure comprises a cabinet body and the air duct heat dissipation structure according to any one of claims 1 to 7, and an area between the cabinet body and the air duct heat dissipation structure forms a circulating air path during operation of the fan of the air duct heat dissipation structure.

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