Frequency converter structure

Abstract

According to the embodiment of the utility model, the frequency converter structure is provided, a cavity is enclosed by a shell, the cavity comprises a cavity first end and a cavity second end which are opposite to each other, and a heating element is installed in the cavity; the frequency converter structure further comprises a first radiator and a second radiator, and the first radiator is arranged on one side close to the first end of the cavity so as to suck cold air outside the frequency converter into the cavity. The second radiator is arranged on one side close to the second end of the cavity and is close to the heating element so as to radiate heat of the heating element, and at least one part of the second radiator is of a multi-layer structure, the height of the level, close to the first heat sink, in the multi-level structure is lower than the height of the level, away from the first heat sink, in the multi-level structure. Through the arrangement, part of cold air can directly enter the second radiator far away from the first radiator, the cooling effect is improved, and the heat dissipation weight and cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the heat dissipation field of power device, more specifically, a frequency converter structure. BACKGROUND

[0002] The commonly used heating elements in the frequency converter, due to their different powers, will also have different heat generation, and the design of the heat sink for these commonly used heating elements in the prior art usually adopts a unified specification, such as a unified heat sink fin height, which results in low heat dissipation efficiency of the frequency converter.

[0003] In addition, in the design of the frequency converter, due to the limitation of product space arrangement, uneven temperature problems may occur between some heating elements due to different distances from the fan, and the design of the existing uniform height heat sink makes it impossible to efficiently and specifically dissipate heat for these heating elements. SUMMARY

[0004] Therefore, the utility model provides a new frequency converter structure to at least solve all or part of the above problems.

[0005] A frequency converter structure, which comprises a cavity surrounded by a shell, the cavity comprising opposite first and second ends, and a heating element installed in the cavity; the frequency converter structure further comprises:

[0006] A first heat sink arranged near the first end of the cavity to suck cold air from outside the frequency converter into the cavity;

[0007] A second heat sink arranged near the second end of the cavity and close to the heating element to dissipate heat from the heating element, at least a part of the second heat sink being a multi-level structure, wherein the height of the level close to the first heat sink is lower than the height of the level away from the first heat sink.

[0008] Further, the heating element comprises a plurality of IGBT modules arranged in sequence from the first end to the second end of the cavity, and the second heat sink comprises a first heat sink unit close to the IGBT modules to dissipate heat therefrom, the first heat sink unit comprising different levels, wherein the level close to the first end of the cavity corresponds to the IGBT module close to the first end of the cavity.

[0009] Further, the frequency converter structure further comprises a first air baffle arranged at the at least one level, the first air baffle comprising a first bottom plate and a first side plate, the first bottom plate being arranged on top of the first heat dissipation unit corresponding to the level, and the first side plate extending upward along an edge of the first bottom plate close to the first heat sink.

[0010] Further, the first side plate forms a first included angle with the top of the first heat dissipation unit.

[0011] Further, the IGBT module comprises a first IGBT module, a second IGBT module, a third IGBT module, a fourth IGBT module, a fifth IGBT module and a sixth IGBT module arranged in sequence from the first end of the cavity to the second end of the cavity, and the second heat sink comprises a first level corresponding to the first IGBT module and the second IGBT module, a second level corresponding to the third IGBT module and the fourth IGBT module, and a third level corresponding to the fifth IGBT module and the sixth IGBT module.

[0012] Further, the heat generating element further comprises a reactor, and the second heat sink further comprises a second heat dissipation unit for dissipating heat of the reactor.

[0013] Further, the height of the second heat dissipation unit is lower than the height of the highest level of the first heat dissipation unit.

[0014] Further, the frequency converter structure further comprises a second air baffle, the second air baffle comprising a second bottom plate and a second side plate, the second bottom plate being arranged on top of the second heat dissipation unit, and the second side plate extending upward along an edge of the second bottom plate close to the first heat sink.

[0015] Further, a third air baffle is arranged between the first heat sink and the second heat sink, the third air baffle comprising a first end plate and a second end plate, one end of the first end plate being fixed to one side of the first heat sink and having a first slope, the other end of the first end plate being connected to the second end plate, and one end of the second end plate away from the first end plate being fixed to one side of the second heat sink.

[0016] Further, the first heat sink comprises three fans arranged side by side.

[0017] From the above technical scheme can be seen, according to the frequency converter structure of the utility model embodiment, a cavity is surrounded by the shell, the cavity includes opposite cavity first end and cavity second end, first radiator is installed on the side close to the cavity first end, the heating element is installed in the cavity, second radiator is installed on the side close to the cavity second end, second radiator carries out heat dissipation to the heating element, and at least a part of second radiator is multilevel structure, and the level height of the multilevel structure close to first radiator is lower than the level height away from first radiator.Such, first radiator will cold air outside the frequency converter be sucked into the cavity, a part of cold air directly enters the level most close to first radiator in second radiator, another part of cold air can also not be heated by the front part of second radiator and directly enter the rear level of second radiator from the space between the level and the rear relatively higher level, which realizes better cooling effect.

[0018] In addition, based on the different heat generation of the reactor and the IGBT module, the height of the heat dissipation fins of each part of the radiator is optimized, the weight of the radiator is reduced, and the material cost of the radiator is reduced.

[0019] In addition, the air deflector is arranged to split the cooling air, thereby improving the splitting effect.

[0020] Further, the air deflector is arranged to be bent at a certain angle, thereby increasing the air pressure on the higher level part at the rear side, and facilitating temperature balance. BRIEF DESCRIPTION OF DRAWINGS

[0021] The preferred embodiments of the utility model will be described in detail below with reference to the drawings, so that the above and other features and advantages of the utility model can be more clearly understood by those skilled in the art, and the drawings are as follows:

[0022] Figure 1 It is a whole structure schematic view of the frequency converter structure according to an embodiment of the utility model;

[0023] Figure 2 It is a partial structure schematic view of the frequency converter structure according to an embodiment of the utility model;

[0024] Figure 3 It is a view of the frequency converter structure according to an embodiment of the utility model; Figure 1 It is a schematic view of the frequency converter structure and the air path after the view is turned upside down.

[0025] Among them, the signs are as follows:

[0026] 1 shell 2 first radiator 10 first heat dissipation unit (11, 12) first air deflector (21, 22) first side plate 41 first IGBT module 42 second IGBT module 43 third IGBT module

[0027] 44 fourth IGBT module 45 fifth IGBT module 46 sixth IGBT module 51 first level

[0028] 52 second level 53 third level 60 electric reactor 70 second heat dissipation unit

[0029] 71 second air deflector 75 second side plate 81 third air deflector DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following embodiments are used to further explain the utility model in detail.

[0031] Figure 1 It is a whole structure schematic view of the frequency converter structure according to an embodiment of the utility model; Figure 2 It is a partial structure schematic view of the frequency converter structure according to an embodiment of the utility model; Figure 3 It is a frequency converter structure schematic view and air path schematic view after the view upside-down. Figure 1 It is a frequency converter structure schematic view and air path schematic view after the view upside-down.

[0032] As shown in Figure 1 and Figure 2 , the frequency converter structure according to the embodiment of the utility model is surrounded by a shell 1 to form a cavity, the cavity includes opposite cavity first end and cavity second end, the cavity is installed with a heating element; the frequency converter structure further includes a first radiator 2 and a second radiator, the first radiator 2 is arranged on the side close to the cavity first end to draw cold air outside the frequency converter into the cavity; the second radiator is arranged on the side close to the cavity second end and close to the heating element to dissipate heat for the heating element, at least a part of the second radiator is a multi-level structure, wherein the height of the level close to the first radiator 2 in the multi-level structure is lower than the height of the level far away from the first radiator 2.

[0033] Generally, when installing the structure into the frequency converter cabinet, Figure 1 the structure in needs to be counterclockwise turned 90 to be installed vertically, that is, Figure 1 the top of the structure in faces the cabinet door, the bottom faces the cabinet back plate, the cavity first end is below the cabinet, and the cavity second end is above the cavity first end. The first radiator 2 is fixed on the shell 1 through, for example, mounting bracket and fastener, and the second radiator can be fixedly installed together with the surface of the heating element through the base to dissipate heat for the heating element.

[0034] Based on the above embodiment, by setting the first heat sink 2 to suck the external cold air into the cavity, and passing through the multi-level structure of the second heat sink, the multi-level structure of the second heat sink is in a step-up state along the direction from the first heat sink 2 to the second heat sink, so that part of the cold air from the first heat sink 2 enters the lowest level closest to the first heat sink 2, and part of the other part of the cold air enters the relatively rear level, so that the first heat sink 2 in the rear level can enter the unheated cooling air, so that the corresponding heating element of the level can obtain better heat dissipation effect.

[0035] In a possible implementation, the first heat sink 2 includes three fans arranged side by side.

[0036] In a possible implementation, the second heat sink is a toothed heat sink. Since the pure aluminum toothed heat sink has high thermal conductivity and good heat dissipation performance, the pure aluminum toothed heat sink can be used to improve the heat dissipation efficiency.

[0037] The IGBT module is a commonly used power component in the frequency converter, which acts as a power switch and is used to control the on-off of the current to achieve precise control. A large amount of heat is generated during the operation of the IGBT module.

[0038] In a possible implementation, the heating element includes a plurality of IGBT modules arranged in sequence along the direction from the first end of the cavity to the second end of the cavity, and the second heat sink includes a first heat dissipation unit 10 close to the IGBT modules to dissipate heat for the IGBT modules. The first heat dissipation unit 10 includes different levels, wherein the level relatively close to the first end of the cavity corresponds to the IGBT module relatively close to the first end of the cavity.

[0039] Based on the embodiment, the IGBT module is cooled by the second heat sink, and the heat dissipation efficiency of the IGBT module is improved.

[0040] In a possible implementation, the frequency converter structure further includes a guide vane arranged at at least one level of the first heat dissipation unit 10. The first guide vane (11, 12) includes a first bottom plate and a first side plate (21, 22). The first bottom plate is arranged on the top of the first heat dissipation unit 10 corresponding to the level. The first side plate (21, 22) extends upward along the edge of the first bottom plate close to the first heat sink 2.

[0041] Specifically, as Figure 1As shown, the first air deflector (11, 12) comprises a first bottom plate and a first side plate (21, 22) extending upward along the edge of the bottom plate close to the first heat sink 2, so that the cold air is better divided under the joint action of the bottom plate and the first side plate (21, 22). Optionally, a first fixed plate extending upward along the other edge of the first bottom plate is further included, and the first fixed plate is fixed to the housing 1 or other components adjacent thereto by fasteners to realize the installation of the first air deflector (11, 12).

[0042] Based on the above embodiment, in another possible implementation, the first side plate (21, 22) forms a first included angle with the top of the first heat dissipation unit 10. By arranging the first side plate (21, 22) in the form of an included angle with the top of the first heat dissipation unit 10, the air pressure of the rear level can be increased, which is beneficial to temperature balance.

[0043] As shown in the figure, Figure 3 As shown, the IGBT module comprises a first IGBT module 41, a second IGBT module 41, a third IGBT module 41, a fourth IGBT module 41, a fifth IGBT module 41, and a sixth IGBT module 41 arranged in sequence from the first end of the cavity to the second end of the cavity, and the second heat sink comprises a first level 51 corresponding to the first IGBT module 41 and the second IGBT module 42, a second level 52 corresponding to the third IGBT module 43 and the fourth IGBT module 44, and a third level 53 corresponding to the fifth IGBT module 45 and the sixth IGBT module 46.

[0044] In this embodiment, for each phase, two IGBT modules are included, and a total of three phases are arranged in sequence from the first heat sink 2 to the second heat sink. The second heat sink is divided into three levels of different heights, the level closest to the first heat sink 2 has the lowest height, and the surface of the two IGBT modules closest to the first heat sink 2 is close to the surface of the two IGBT modules closest to the first heat sink 2, so as to dissipate heat from the two IGBT modules. The level of intermediate height is close to the surface of the two IGBT modules in the middle, so as to dissipate heat from the two IGBT modules. The highest level is close to the surface of the two IGBT modules farthest from the first heat sink 2, so as to dissipate heat from the two IGBT modules. Since the farther the position from the first heat sink, the worse the heat dissipation effect, the level of the first heat dissipation unit corresponding to the IGBT module farthest from the first heat sink is set to the highest, so that the heat dissipation efficiency is maximized, and the cooling air blown by the first heat sink can directly enter the level through the height space between the front level, so as to improve the heat dissipation effect and achieve heat dissipation balance as much as possible.

[0045] Based on the embodiment, the first wind deflector (11, 12) is arranged at the first level 51, the second level 52 and the third level 53, so that the guiding effect is optimal.

[0046] In a possible implementation, the heat generating element further comprises an electric reactor 60, and the second heat sink further comprises a second heat dissipation unit 70 for dissipating heat of the electric reactor 60. Specifically, the top of the second heat sink is connected to the electric reactor 60 through a base to dissipate heat of the electric reactor 60.

[0047] Based on the embodiment, in another possible implementation, the first heat dissipation unit 10 and the second heat dissipation unit 70 are integrally formed.

[0048] In a possible implementation, the height of the second heat dissipation unit 70 is lower than the height of the highest level of the first heat dissipation unit 10.

[0049] In this way, since the electric reactor 60 and the IGBT module have different heat generation amounts, the height of the fins of the first heat dissipation unit 10 and the height of the fins of each level of the second heat dissipation unit 70 are adaptively set, so that the optimal heat dissipation effect is met, and the weight of the heat sink and the material cost of the heat sink are reduced.

[0050] Based on the above embodiment, in another possible implementation, the frequency converter structure further comprises a second wind deflector 71, the second wind deflector 71 comprises a second bottom plate and a second side plate 75, the second bottom plate is arranged on the top of the second heat dissipation unit 70, and the second side plate 75 extends upward along the edge of the second bottom plate close to the first heat sink 2. In this way, the cooling air is better divided on one side of the second heat dissipation unit 70.

[0051] Optionally, the second wind deflector 71 further comprises a second fixing plate extending upward along the other edge of the bottom plate, and the second fixing plate is fixed to the shell 1 or other components adjacent thereto through fasteners to realize installation of the second wind deflector 71.

[0052] Based on the above structure, in another possible implementation, the second side plate 75 is an "L" type plate to realize better division effect.

[0053] In another possible implementation, a third air deflector 81 is arranged between the first heat sink 2 and the second heat sink, the third air deflector 81 comprising a first end plate and a second end plate, one end of the first end plate being fixed to one side of the first heat sink 2 and having a first slope, the other end of the first end plate being connected with the second end plate, and one end of the second end plate away from the first end plate being fixed to one side of the second heat sink. Through the structure, the cold air of the first heat sink 2 can be more efficiently guided to the second heat sink.

[0054] The following will be described in combination with Figure 3 the air duct, Figure 3 The cold air enters the cavity via the first heat sink 2 by I, a part of the cold air directly enters the first level 51 of the first heat sink unit 10 and the second heat sink unit 70 by A, another part of the cold air passes through B, a part of the cold air passing through B directly passes through C and then enters the second level 52 of the first heat sink unit 10, another part of the cold air enters D and then enters the third level 53 by D, and the hot air passing through the first level 51, the second level 52 and the third level 53 of the first heat sink unit 10 and the hot air passing through the second heat sink unit 70 are discharged to the outside of the cavity via the O channel, so as to realize the cooling of the heat generating element.

[0055] It should be noted that the height of the level referred to in the above embodiment is based on the view in Figure 1 , not based on the state after being installed into the cabinet; the height of the level referred to in the above embodiment is also based on the view in the above embodiment. The first side plate (21, 22) and the second side plate 75 extend upward along the edge of the first bottom plate and the second bottom plate close to the first heat sink 2 are based on the view in Figure 1 , not the upward direction in the state of being installed into the cabinet.

[0056] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A frequency converter structure, characterized in that A cavity is formed by a shell (1), the cavity includes opposite first cavity end and second cavity end, a heating element is installed in the cavity; the frequency converter structure further includes: A first heat sink (2) is arranged near the first cavity end to suck cold air outside the frequency converter into the cavity; A second heat sink is arranged near the second cavity end and near the heating element to dissipate heat from the heating element, at least part of the second heat sink is a multi-level structure, wherein the height of the level near the first heat sink (2) is lower than the height of the level away from the first heat sink (2).

2. The frequency converter structure of claim 1, characterized in that The heating element includes a plurality of IGBT modules arranged in sequence from the first cavity end to the second cavity end, the second heat sink includes a first heat dissipation unit (10) near the IGBT module to dissipate heat from the IGBT module, the first heat dissipation unit (10) includes different levels, wherein the level relatively close to the first cavity end corresponds to the IGBT module relatively close to the first cavity end.

3. The frequency converter structure of claim 2, characterized in that The frequency converter structure further includes a first air baffle (11, 12) arranged at least one of the levels, the first air baffle (11, 12) includes a first bottom plate and a first side plate (21, 22), the first bottom plate is arranged on top of the first heat dissipation unit (10) corresponding to the level, the first side plate (21, 22) extends upward along the edge of the first bottom plate close to the first heat sink (2).

4. The frequency converter structure of claim 3, characterized in that The first side plate (21, 22) forms a first included angle with the top of the first heat dissipation unit (10).

5. The frequency converter structure of claim 4, characterized in that The IGBT module includes a first IGBT module (41), a second IGBT module (42), a third IGBT module (43), a fourth IGBT module (44), a fifth IGBT module (45), and a sixth IGBT module (46) arranged in sequence from the first cavity end to the second cavity end, the second heat sink includes a first level (51) corresponding to the first IGBT module (41) and the second IGBT module (42), a second level (52) corresponding to the third IGBT module (43) and the fourth IGBT module (44), and a third level (53) corresponding to the fifth IGBT module (45) and the sixth IGBT module (46).

6. A frequency converter structure according to any one of claims 2 to 5, characterized in that The heating element further includes a reactor (60), and the second heat sink further includes a second heat dissipation unit (70) for dissipating heat from the reactor (60).

7. The frequency converter structure of claim 6, characterized in that The height of the second heat dissipation unit (70) is lower than the height of the highest level of the first heat dissipation unit (10).

8. The frequency converter structure of claim 7, characterized in that The frequency converter structure further comprises a second air deflector (71), which comprises a second bottom plate and a second side plate (75), the second bottom plate is arranged on the top of the second heat dissipation unit (70), and the second side plate (75) extends upward along the edge of the second bottom plate close to the first radiator (2).

9. The frequency converter structure of claim 1, wherein, A third air deflector (81) is arranged between the first radiator (2) and the second radiator, the third air deflector (81) comprises a first end plate and a second end plate, one end of the first end plate is fixed on one side of the first radiator (2) and has a first slope, the other end of the first end plate is connected with the second end plate, and one end of the second end plate away from the first end plate is fixed on one side of the second radiator.

10. The frequency converter structure of claim 1, wherein, The first radiator (2) comprises three fans arranged side by side.

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