Air-cooled power unit

Abstract

The utility model discloses an air-cooled power unit, which comprises a shell, a rectification unit and an inversion unit positioned above the rectification unit are arranged in the shell, the rectification unit comprises a rectification shell and a first laminated busbar, and the first laminated busbar divides the rectification shell into a first air duct cavity and a second air duct cavity. The first laminated busbar is provided with at least one first bus capacitor and a diode module which are located in the first air duct cavity, and the first laminated busbar is provided with a rectification radiator located in the second air duct cavity; the inversion unit comprises an inversion shell and a second laminated busbar, the second laminated busbar divides the inversion shell into a third air duct cavity and a fourth air duct cavity, an inversion radiator located in the third air duct cavity is installed on the second laminated busbar, at least one second bus capacitor located in the fourth air duct cavity and an I-GBT module are installed on the second laminated busbar, and the I-GBT module is connected with the inversion shell. An absorption capacitor is integrated on the IGBT module; a heat dissipation air channel is optimized, the element arrangement mode is improved, and thermal coupling is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage inverters, and particularly relates to an air-cooled power unit. Background Art

[0002] High-voltage inverters play a key role in multiple industries such as power, chemical industry, petroleum, and metallurgy. Especially in scenarios where precise control of high-power motor speed and energy efficiency improvement are required, as the core of the high-voltage inverter, the design and heat dissipation solution of the power unit directly affect the performance and reliability of the entire system.

[0003] Air cooling is an economical and easy-to-maintain heat dissipation method. It drives air to flow through the heat sink on the surface of the power module to take away heat. This method has low cost and simple installation, and is suitable for occasions with moderate ambient temperature and not particularly high power density. When using air cooling for heat dissipation in the power unit, since there are heat-generating components such as IGBT modules, diode modules, bus capacitors, and resistors in the components, it is easy to generate thermal coupling according to the conventional air flow to achieve heat dissipation, that is, the temperature of heat dissipation of one component moves towards another component, resulting in poor heat dissipation effect of the component located behind the heat dissipation flow path.

[0004] Therefore, when considering using air cooling for heat dissipation of the power unit, it is necessary to optimize the heat dissipation air duct and improve the component layout method to eliminate the thermal coupling phenomenon. Summary of the Utility Model

[0005] (1) Technical Problem

[0006] The purpose of the utility model is to provide an air-cooled power unit to solve the problem of optimizing the heat dissipation air duct and improving the component layout method to eliminate thermal coupling under air-cooled heat dissipation.

[0007] (2) Technical Solution

[0008] To achieve the above purpose, the utility model provides the following technical solution:

[0009] An air-cooled power unit includes a housing. A rectifying unit and an inverter unit located above the rectifying unit are installed inside the housing. A connecting stack is provided between the rectifying unit and the inverter unit. The rectifying unit includes a rectifying housing and a first laminated busbar disposed inside the rectifying housing. The first laminated busbar divides the rectifying housing into a longitudinally arranged first air duct cavity and a second air duct cavity located below the first air duct cavity. At least one first bus capacitor and a diode module located in the first air duct cavity are installed on the first laminated busbar. A rectifying radiator located in the second air duct cavity is installed on the first laminated busbar. The inverter unit includes an inverter housing and a second laminated busbar disposed inside the inverter housing. The second laminated busbar divides the inverter housing into a longitudinally arranged third air duct cavity and a fourth air duct cavity located below the third air duct cavity. An inverter radiator located in the third air duct cavity is installed on the second laminated busbar. At least one second bus capacitor and an IGBT module located in the fourth air duct cavity are installed on the second laminated busbar. An absorption capacitor is integrated on the IGBT module.

[0010] Preferably, a wind shield partition is installed on the housing. The wind shield partition is provided with a first air inlet communicating with the first air duct cavity, a second air inlet communicating with the second air duct cavity, a third air inlet communicating with the third air duct cavity, and a fourth air inlet communicating with the fourth air duct cavity.

[0011] Preferably, the first air inlet and the fourth air inlet include a plurality of round holes arranged in an array.

[0012] Preferably, the opening ratio of the round holes is 3%-5%.

[0013] Preferably, the second air inlet is a plurality of first strip holes arranged in an array, and the third air inlet is a plurality of second strip holes arranged in an array.

[0014] Preferably, the opening ratio of the first strip holes is 47%-50%, and the opening ratio of the second strip holes is 74%-80%.

[0015] Preferably, the first air duct cavity communicates with the second air duct cavity.

[0016] Preferably, a wind shield partition is provided on the housing. The wind shield partition is provided with a fifth air inlet communicating with the first air duct cavity and the second air duct cavity.

[0017] Preferably, the fifth air inlet is a plurality of third strip holes arranged in an array.

[0018] Preferably, the opening ratio of the third strip holes is 47%-50%.

[0019] (III) Beneficial effects

[0020] The rectifying unit and the inverting unit are independently and longitudinally isolated and installed by means of a housing, and are conductively connected by connecting stacked rows, and the heat dissipation processes of the rectifying unit and the inverting unit are isolated; specifically, in the rectifying unit, the rectifying housing is separated by a first laminated busbar to form an isolated first air duct cavity and a second air duct cavity, and the heat generated by the diodes is independently dissipated through the rectifying radiator arranged in the second air duct cavity, while the first bus capacitor and the diode module that generate heat are arranged in the first air duct cavity for independent heat dissipation, without the occurrence of thermal coupling;

[0021] Meanwhile, in the inverting unit, the inverting housing is separated by a second laminated busbar into an isolated third air duct cavity and a fourth air duct cavity. An inverting radiator is arranged in the third air duct cavity to conduct heat to the IGBT module with a large amount of heat generated and achieve independent heat dissipation. A second bus capacitor, an IGBT module, and an absorption capacitor are arranged in the fourth air duct cavity, also achieving independent heat dissipation. Thus, the generated heat is dispersed. Since the heat dissipation of the components in the inverting unit is relatively large, the components with less heat generation are arranged at the front end of the air duct cavity, and the components with more heat are arranged at the rear end. Moreover, the inverting radiator with the largest amount of heat is independently isolated to avoid the situation of heat dissipation thermal coupling;

[0022] Thus, on the basis of separately dissipating heat from the rectifying unit and the inverting unit, the heat dissipation of the components constituting the rectifying unit and the inverting unit is further separated, improving the heat dissipation efficiency and avoiding the phenomenon of thermal coupling. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model;

[0024] Figure 2 It is a schematic cross-sectional structural diagram of the rectifying unit in an embodiment of the present utility model;

[0025] Figure 3 It is a schematic cross-sectional structural diagram of the inverting unit in an embodiment of the present utility model;

[0026] Figure 4 It is a schematic diagram of the first air duct arrangement mode in an embodiment of the present utility model;

[0027] Figure 5 It is Figure 4 a schematic diagram of the air inlet structure of

[0028] Figure 6 It is a schematic diagram of the second air duct arrangement mode in an embodiment of the present utility model;

[0029] Figure 7 It is Figure 6 a schematic diagram of the air inlet structure of

[0030] In Figures 1 to 7 the component names or the correspondence between the lines and the drawing numbers is as follows:

[0031] housing 1, rectifying unit 2, rectifying housing 21, first laminated busbar 22, first air duct cavity 23, second air duct cavity 24, first bus capacitor 25, diode module 26, rectifying radiator 27, inverter unit 3, inverter housing 31, second laminated busbar 32, third air duct cavity 33, fourth air duct cavity 34, inverter radiator 35, second bus capacitor 36, IGBT module 37, absorption capacitor 38, connecting laminated row 4, wind baffle 5, first air inlet 51, second air inlet 52, third air inlet 53, fourth air inlet 54, fifth air inlet 55. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0033] Refer to Figures 1 - 3 As shown, in the embodiment of the present invention, an air-cooled power unit is proposed, which is applied to a high-voltage frequency converter. The specific circuit principle and the components can all adopt mature technologies. The main purpose of this embodiment is to improve the heat dissipation efficiency of the entire power unit by using the air-cooled method, and to optimize to avoid the occurrence of thermal coupling phenomenon, so that the power unit can be reliably cooled by using a low-cost air-cooled heat dissipation method.

[0034] Specifically, the air-cooled power unit includes a housing 1. A rectifying unit 2 and an inverter unit 3 located above the rectifying unit 2 are installed in the housing 1. A connecting laminated row 4 is provided between the rectifying unit 2 and the inverter unit 3. The entire structure is encapsulated by the housing 1, and the rectifying unit 2 and the inverter unit 3 are isolated to form independent heat dissipation without mutual interference. The electrical connection between the rectifying unit 2 and the inverter unit 3 is realized through the connecting laminated row 4.

[0035] Among them, the rectifying unit 2 includes a rectifying housing 21 and a first laminated busbar 22 disposed inside the rectifying housing 21. The first laminated busbar 22 divides the rectifying housing 21 into a first air duct cavity 23 arranged longitudinally and a second air duct cavity 24 located below the first air duct cavity 23. At least one first bus capacitor 25 and a diode module 26 located in the first air duct cavity 23 are installed on the first laminated busbar 22. A rectifying radiator 27 located in the second air duct cavity 24 is installed on the first laminated busbar 22. By using the first laminated busbar 22 as a common conductive end and separating the interior of the rectifying housing 21 to form independent first and second air duct cavities 23 and 24, the diode module 26 that generates more heat is independently arranged in the second air duct cavity 24 after being thermally conducted through the rectifying radiator 27 to achieve independent heat dissipation. At the same time, the first bus capacitor 25 and the diode module 26 are arranged in the first air duct cavity 23, and cold air enters the first and second air duct cavities 23 and 24 respectively for independent heat dissipation, without heat intersection, thus avoiding the phenomenon of thermal coupling.

[0036] Meanwhile, the inverter unit 3 includes an inverter housing 31 and a second laminated busbar 32 disposed inside the inverter housing 31. The second laminated busbar 32 divides the inverter housing 31 into a third air duct cavity 33 arranged longitudinally and a fourth air duct cavity 34 located below the third air duct cavity 33. An inverter radiator 35 located in the third air duct cavity 33 is installed on the second laminated busbar 32. At least one second bus capacitor 36 and an IGBT module 37 located in the fourth air duct cavity 34 are installed on the second laminated busbar 32. An absorption capacitor 38 is integrated on the IGBT module 37; similarly, by using the second laminated busbar 32 to divide the interior of the inverter housing 31 into isolated third and fourth air duct cavities 33 and 34, since the inverter radiator 35 is mainly used to conduct heat for the IGBT module 37 that generates more heat and is independently arranged in the third air duct cavity 33 to achieve independent heat dissipation, and in the fourth air duct cavity 34, components with less heat generation are arranged at the front end, while the IGBT module 37 and the absorption capacitor 38 with more heat generation are arranged at the rear end, no thermal coupling will occur during heat dissipation in the fourth air duct cavity 34. Specifically, the third and fourth air duct cavities 33 and 34 are isolated and independently cooled to avoid the phenomenon of thermal coupling.

[0037] Thus, by separating the rectifying unit 2 and the inverter unit 3, and then separating the devices constituting the rectifying unit 2 and the inverter unit 3 in different heat dissipation cavities for heat dissipation, independent and isolated heat dissipation is achieved, avoiding the phenomenon of heat coupling.

[0038] Among them, the first stacked busbar 22 and the second stacked busbar 32 are electrically connected to the connecting stacked busbar 4, serving as the electrical connection end of the internal integrated device. Wiring can be carried out on the connecting stacked busbar 4 from the outside.

[0039] At the air inlet of the housing 1, the cooling air entering different air duct cavities is shunted to ensure the air intake volume. As Figure 4 , Figure 5 shown, specifically, a wind baffle 5 is installed on the housing 1. The wind baffle 5 is provided with a first air inlet 51 communicating with the first air duct cavity 23, a second air inlet 52 communicating with the second air duct cavity 24, a third air inlet 53 communicating with the third air duct cavity 33, and a fourth air inlet 54 communicating with the fourth air duct cavity 34. After the air inlets are separated by the wind baffle 5, it can be ensured that the air volumes entering the first air duct cavity 23, the second air duct cavity 24, the third air duct cavity 33, and the fourth air duct cavity 34 can be independently controlled and effectively shunted to ensure the cooling air volume requirement.

[0040] In one embodiment, as Figure 6 , Figure 7 shown, the first air inlet 51 and the fourth air inlet 54 include a number of round holes arranged in an array, and the opening ratio of the round holes is 3%-5%. The components in the first air duct cavity 23 and the second air duct cavity 24 generate less heat, and the cooling air can circulate to meet the cooling requirement.

[0041] The second air inlet 52 is a number of first strip-shaped holes arranged in an array, and the third air inlet 53 is a number of second strip-shaped holes arranged in an array. The opening ratio of the first strip-shaped holes is 47%-50%, and the opening ratio of the second strip-shaped holes is 74%-80%. Among them, the heat generated by the rectifier radiator 27 is less than that of the inverter radiator 35. The corresponding opening ratio is adjusted according to the cooling requirement. Thus, it can be ensured that the cooling air entering different air duct cavities is shunted and flows corresponding to the cooling requirement, improving the cooling efficiency.

[0042] In another embodiment, since the heat generated by the entire rectifier unit 2 is controllable, the first air duct cavity 23 is communicated with the second air duct cavity 24, and the cooling air is shunted internally, and the heat dissipation of devices with different heats is still separated.

[0043] In this embodiment, the inverter unit 3 still adopts the existing separate air inlet mode. A wind baffle 5 is provided on the housing 1. The wind baffle 5 is provided with a fifth air inlet 55 communicating with the first air duct cavity 23 and the second air duct cavity 24. The fifth air inlet 55 replaces the round hole mode. Specifically, the fifth air inlet 55 is a number of third strip-shaped holes arranged in an array, and the opening ratio of the third strip-shaped holes is 47%-50%.

[0044] Specifically, when considering the heat dissipation effect, the first air duct cavity 23 and the second air duct cavity 24 in the rectifying unit 2 can be independently introduced with cooling air, or it can also be considered to integrate the unified air intake and then perform flow splitting inside the internal cavity to achieve heat dissipation. In both cases, good heat dissipation effects can be obtained, and no thermal coupling phenomenon will occur.

[0045] In the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0047] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. An air-cooled power unit, characterized in that: It includes a housing, a rectifying unit is installed inside the housing, and an inverter unit is located above the rectifying unit. A connecting stack is provided between the rectifying unit and the inverter unit; The rectifying unit includes a rectifying housing and a first stacked busbar arranged inside the rectifying housing. The first stacked busbar divides the rectifying housing into a first air duct cavity arranged longitudinally and a second air duct cavity located below the first air duct cavity. At least one first bus capacitor and a diode module located in the first air duct cavity are installed on the first stacked busbar. A rectifying radiator located in the second air duct cavity is installed on the first stacked busbar; The inverter unit includes an inverter housing and a second stacked busbar arranged inside the inverter housing. The second stacked busbar divides the inverter housing into a third air duct cavity arranged longitudinally and a fourth air duct cavity located below the third air duct cavity. An inverter radiator located in the third air duct cavity is installed on the second stacked busbar. At least one second bus capacitor and an IGBT module located in the fourth air duct cavity are installed on the second stacked busbar. An absorption capacitor is integrated on the IGBT module; 2. The air-cooled power unit according to claim 1, characterized in that: A wind baffle is installed on the housing. The wind baffle is provided with a first air inlet communicating with the first air duct cavity, a second air inlet communicating with the second air duct cavity, a third air inlet communicating with the third air duct cavity, and a fourth air inlet communicating with the fourth air duct cavity; 3. The air-cooled power unit according to claim 2, characterized in that: The first air inlet and the fourth air inlet include a number of round holes arranged in an array; 4. The air-cooled power unit according to claim 3, characterized in that: The opening ratio of the round holes is 3%-5%; 5. The air-cooled power unit according to claim 2, wherein: The second air inlet is a number of first strip holes arranged in an array, and the third air inlet is a number of second strip holes arranged in an array; 6. The air-cooled power unit according to claim 5, characterized in that: The opening ratio of the first strip holes is 47%-50%, and the opening ratio of the second strip holes is 74%-80%; 7. The air-cooled power unit according to claim 1, wherein: The first air duct cavity communicates with the second air duct cavity; 8. The air-cooled power unit according to claim 7, wherein: A wind baffle is provided on the housing. The wind baffle is provided with a fifth air inlet communicating with the first air duct cavity and the second air duct cavity; 9. The air-cooled power unit according to claim 8, characterized in that: The fifth air inlet is a number of third strip holes arranged in an array; 10. The air-cooled power unit according to claim 9, characterized in that: The opening ratio of the third strip holes is 47%-50%.

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