An electrical cabinet

Abstract

The application discloses an electrical cabinet, comprising: a cabinet body having a first chamber; a power assembly located in the first chamber and comprising a capacitor busbar and a power module; the capacitor busbar and the power module correspond to parallel extension planes; the capacitor busbar is provided with a first end, and the power module is provided with a second end, which form external connection ends of the power module; a first electrical component is provided with a third end for connecting with the first end; a second electrical component is provided with a fourth end for connecting with the second end; and a first heat exchanger has a cold air inlet and a hot air outlet communicating with the first chamber, and the cold air inlet and the hot air outlet are located on both sides of the capacitor busbar respectively; the first end, the second end, the third end and the fourth end are all in the form of a lead wire row, and the extension directions of the four are all perpendicular to a first direction, and the four are connected through the lead wire row; and the first direction is parallel to the extension plane of the capacitor busbar. The electrical cabinet can improve the contradiction between the miniaturization of the overall volume of the electrical cabinet and the high heat dissipation efficiency.

Description

Technical Field

[0001] This invention relates to the field of electrical cabinets, and more specifically to an electrical cabinet. Background Technology

[0002] Converters are widely used in power systems, rail transportation, military industry, petroleum machinery, new energy vehicles, wind power generation, solar photovoltaic and other fields. They connect the battery system to the power grid to realize bidirectional conversion of electrical energy, control the charging and discharging process of the battery, and perform AC-DC conversion. In the absence of a power grid, they can directly supply power to AC loads. At the same time, NPC (Neutral Point Clamp) or ANPC (Active Neutral Point Clamp) three-level topologies can use IGBT devices with low blocking voltage to increase the DC bus voltage, thereby increasing the AC output voltage and expanding the system power level. Therefore, they are widely used in converters.

[0003] Converters typically form power distribution networks in the form of electrical cabinets, working in conjunction with other electrical equipment. Their internal power components, DC electrical components, and AC electrical components all require high levels of heat dissipation and protection. The power components, in particular, as the main circuit structure of the converter, contain a large number of IGBTs and capacitors, generating significant heat during operation. Furthermore, their wiring to the DC and AC electrical components is complex, requiring sufficient space for this wiring. In current technology, converter electrical cabinets generally employ air cooling. However, to achieve high heat dissipation efficiency with the high heat generation of the power components, the size and power of the air cooling components must be increased. This, coupled with the need for sufficient space for the power component wiring, further hinders the miniaturization of the overall electrical cabinet, creating a contradiction between miniaturization and high heat dissipation efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the aforementioned defects or problems in the prior art and to provide an electrical device that can resolve the contradiction between miniaturization of the overall size of the electrical cabinet and high heat dissipation efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions, but the implementation methods are not limited to the following solutions:

[0006] Technical Solution 1: An electrical cabinet, comprising: a cabinet having a first chamber; a power component located in the first chamber, including a capacitor busbar and a power module; the extension planes corresponding to the capacitor busbar and the power module are parallel; the capacitor busbar has a first end, and the power module has a second end, which respectively form the external wiring terminals of the power module; a first electrical component having a third end for connecting to the first end; a second electrical component having a fourth end for connecting to the second end; and a first heat exchanger having a cold air inlet and a hot air inlet communicating with the first chamber, the cold air inlet and the hot air inlet being located on both sides of the capacitor busbar; the first end, the second end, the third end, and the fourth end are all in the form of lead busbars, and the extension directions of the four are all perpendicular to a first direction, and they are connected to each other through a terminal block; the first direction is parallel to the extension plane of the capacitor busbar.

[0007] Technical Solution 2 based on Technical Solution 1: The first end is located on one side of the power component along the second direction, and the second end is located on the other side of the power component along the second direction; the second direction is parallel to the extension plane of the capacitor busbar and forms an angle with the first direction.

[0008] Technical Solution 3 based on Technical Solution 2: The first end extends forward along the second direction corresponding to its position relative to the power component; the second end extends backward along the second direction corresponding to its position relative to the power component; the third end of the first electrical component is located in front of the first end, and the fourth end of the second electrical component is located between the first end and the second end or behind the second end.

[0009] Technical solution four based on technical solution three: the first end, the second end, the third end and the fourth end each extend only in the same direction, and each of their extension directions is parallel to the extension plane of the capacitor busbar.

[0010] Technical Solution 5 based on Technical Solution 4: The power component further includes a DC capacitor bank; the power module and the DC capacitor bank are located on two opposite sides of the capacitor busbar, and the side where the DC capacitor bank is located corresponds to the cold air inlet of the first heat exchanger, and the side where the power module is located corresponds to the hot air inlet of the first heat exchanger; the DC capacitor bank includes two capacitor arrays separated from each other along a second direction, each capacitor array including several capacitors arranged at intervals, and a flow splitting channel is formed between the two capacitor arrays; the cold air inlet of the first heat exchanger is adapted to guide the airflow toward the flow splitting channel.

[0011] Technical Solution Six based on Technical Solution Five: The power component divides the first chamber into a first air zone and a second air zone, and forms a first channel with the front end of the first end of the power component along the second direction and the cavity wall of the first chamber, and forms a second channel with the rear end of the second end along the second direction and the cavity wall of the first chamber; the first heat exchanger is located on the rear side of the power component along the second direction, and its cold air outlet is located in the first air zone and its hot air outlet is located in the second air zone; the cold air outlet of the first heat exchanger is adapted to guide the airflow to tilt towards the diversion channel, and the tilting direction is from the side where the second channel is located to the side where the first channel is located; the capacitor busbar is adapted to guide the airflow through the diversion channel and then divert one airflow through the first channel and the second air zone to reach the hot air outlet, and allow the other airflow to reach the hot air outlet through the second channel.

[0012] Technical solution seven based on technical solution six: The power module includes an electrical connector, a power transistor, a mounting plate, and a terminal block; the power transistor is mounted on the mounting plate and connected to the capacitor busbar through the electrical connector; the terminal block is connected to the power transistor and is used to form the second end; the mounting plate is arranged parallel to the capacitor busbar and forms a third channel between the mounting plate and the capacitor busbar, and after the airflow reaches the second air zone from the first channel, part of it passes through the third channel to reach the hot air outlet of the first heat exchanger.

[0013] Technical solution eight, based on technical solution seven, also includes a second heat exchanger; the mounting plate is a liquid-cooled radiator, which is connected to the second heat exchanger through a liquid-cooled pipe.

[0014] Based on technical solution eight, technical solution nine: the cabinet also has a second chamber, the second chamber is connected to the first chamber through a fourth channel, and is provided with an exhaust vent; the first heat exchanger delivers the heat-exchanged hot air to the second chamber through the fourth channel; the second heat exchanger delivers the heat-exchanged hot air to the second chamber; the exhaust vent is used to send the hot air in the second chamber out.

[0015] Technical solution ten based on technical solution nine: Relative to the cabinet, the first direction is the left-right direction, the second direction is the front-back direction, the power module is located above the capacitor busbar, the DC capacitor bank is located below the capacitor busbar, the second chamber is located above the first chamber, the first electrical component is a DC electrical component and is located in front of the capacitor busbar, and the second electrical component is an AC electrical component and is located below the capacitor busbar.

[0016] As can be seen from the above description of the present invention, compared with the prior art, the technical solution of the present invention has the following beneficial effects due to the adoption of the following technical means:

[0017] In technical solution one, the capacitor busbar in the power component has a first end, the power module has a second end, and the first and second electrical components each have a third and a fourth end, respectively. The first end can be connected to the third end via a terminal block, and the second end can be connected to the fourth end via a terminal block. The extension directions of the first, second, third, and fourth ends are all perpendicular to a first direction, and all four ends are in the form of lead busbars. Therefore, when connecting via terminal busbars, the terminal busbars do not need to be twisted or have their direction changed by other accessories; they can be connected directly. This convenience in wiring is partly due to the lead busbar configuration of the power component's terminals and the terminals of the first and second electrical components, and the special design of the extension directions of these lead busbars. One reason is the parallel design of the extension planes corresponding to the capacitor busbar and the power module in the power assembly. Since the first direction is parallel to the extension plane of the capacitor busbar, the first and second ends can extend outwards perpendicular to the first direction without twisting or adding other accessories, based on the extension planes of the capacitor busbar and the power module. This reduces the space occupied by the wiring structure and has a better effect in terms of wiring indirectness, smoothness and convenience. At the same time, the capacitor busbar also separates the cold air inlet and hot air inlet of the first heat exchanger, so that the first chamber is divided into two relatively separated spaces by the capacitor busbar. The separation of these two spaces creates an air duct from the cold air inlet to the hot air inlet in the first chamber. The cold air can flow along the preset path, further improving the heat exchange efficiency of the first heat exchanger.

[0018] In the second technical solution, the first end and the second end of the power component are respectively set on both sides along the second direction. The second direction is parallel to the extension plane of the capacitor busbar and forms an angle with the first direction. Thus, the positions of the first end and the second end are far apart from each other, and when connected to the first electrical component and the second electrical component, interference between the first end and the second end during wiring can be avoided.

[0019] In technical solution three, the first end extends forward along the second direction, and the second end extends backward along the second direction. At the same time, the third end of the first electrical component is located in front of the first end, and the fourth end of the second electrical component is located between the first end and the second end or behind the second end. Thus, the first electrical component can be placed in front of the power component, and the second electrical component can be placed below or behind the power component. The positions of the first electrical component and the second electrical component are far apart from each other, which facilitates the wiring between the power component and the first electrical component and the second electrical component, and also improves the heat dissipation efficiency of the first heat exchanger.

[0020] In technical solution four, the first, second, third and fourth ends each extend only in the same direction, that is, the four lead rows do not form bends and are extended in a completely flat manner, which can reduce the wiring length and reduce manufacturing costs.

[0021] In technical solution five, the power component also includes a DC capacitor bank. A shunt channel is formed between the two capacitor arrays of the DC capacitor bank. The first heat exchanger can blow cold air into this shunt channel, thereby distributing the cold air to the two capacitor arrays separately, improving the heat dissipation effect on the DC capacitor bank. Furthermore, the DC capacitor bank in the power component is divided into two separate parts, each with fewer capacitors, thus reducing the total heat generated by each part. The originally high heat generated by the DC capacitor bank is dispersed to two different locations, significantly reducing the heat dissipation pressure on the DC capacitor bank. In addition, the emitted cold air is blocked by the capacitor busbar, splitting it into two streams. The two airflows dissipate heat from the capacitors in two separate locations. Compared to clustering the capacitors in one place, the smaller number of capacitors in each section results in a lower temperature rise when the cold air reaches the capacitors at the rear of the airflow direction. Simultaneously, the energy loss due to capacitor obstruction is also lower. Under the same temperature and flow rate, this further improves the heat dissipation efficiency of the DC capacitor bank. Furthermore, the capacitor busbar acts as a barrier, forcing the cold air to flow only along its extension direction. This allows the cold air to flow close to the capacitor busbar, resulting in longer contact time, better contact effect, and improved heat dissipation for the capacitor busbar.

[0022] In technical solution six, the cold air is divided into two streams by the diversion channel. One stream passes through the first air duct from the first air zone to the second air zone and then to the hot air outlet. The other stream passes through the second air duct from the first air zone directly to the hot air outlet. The cold air is blown at an angle towards the capacitor busbar. Therefore, the first stream of cold air has a larger flow rate and can travel a longer path, providing better heat dissipation. The second stream of cold air has a smaller flow rate and can specifically dissipate heat for the corresponding capacitor array. The combination of the two further improves the overall heat dissipation efficiency.

[0023] In technical solution seven, a third channel is formed between the mounting plate and the capacitor busbar in the power module. The flow rate of the cold air increases when passing through the third channel, which can improve the heat dissipation efficiency of the power module.

[0024] In technical solution eight, a second heat exchanger is set up, and the power module can be liquid-cooled for heat dissipation, which has higher heat dissipation efficiency and allows the power module to be made smaller.

[0025] In technical solution nine, a second chamber is set up. The first and second chambers are connected by a fourth channel and separated from the first chamber. This can improve the protection level of the first chamber and prevent external pollutants from affecting the devices in the first chamber. At the same time, the hot air after heat exchange between the first and second heat exchangers is sent out through the exhaust port of the second chamber, so that the first and second heat exchangers can work normally.

[0026] In technical solution ten, the power components are placed horizontally, with the power module located above the capacitor busbar and the DC capacitor bank located below the capacitor busbar. This facilitates the installation of the power module and the DC capacitor bank with the capacitor busbar and improves the stability after installation. At the same time, the second chamber is located above the first chamber, which facilitates the second heat exchanger to dissipate heat from the mounting plate in the power module. The first electrical component is located in front of the capacitor busbar, and the second electrical component is located below the capacitor busbar, which can improve the overall space utilization of the cabinet. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of an electrical cabinet provided in an embodiment of the present invention;

[0029] Figure 2 This is a partial structural diagram of an electrical cabinet provided in an embodiment of the present invention;

[0030] Figure 3 for Figure 1 A schematic diagram of the airflow in the electrical cabinet.

[0031] Explanation of key figure labels:

[0032] Cabinet 10; First Chamber 11; First Air Zone 111; Second Air Zone 112; First Channel 113; Second Channel 114; Third Channel 115; Fourth Channel 116; Second Chamber 12; Exhaust Vent 13; First Baffle 14; Second Baffle 15; Third Baffle 16; Third Chamber 17; First Air Inlet 171; Second Air Inlet 172; First Air Outlet 173; Second Air Outlet 174; Fourth Baffle 18; Power Components 20; Capacitor Busbar 21; First terminal 211; Power module 22; Electrical connector 221; Power transistor 222; Mounting plate 223; Terminal block 224; DC capacitor bank 23; Capacitor array 231; Shunt channel 232; Protective shell 233; First electrical component 30; Third terminal 31; Second electrical component 40; Fourth terminal 41; Reactor 42; AC switch 43; First heat exchanger 50; Cold air outlet 51; Hot air outlet 52; Second heat exchanger 60; Liquid cooling pipe 61. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0035] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0036] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0037] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0038] Example

[0039] This embodiment provides an electrical cabinet, which mainly includes a cabinet body 10, and a power component 20, a first electrical component 30, a second electrical component 40, a first heat exchanger 50 and a second heat exchanger 60 located inside the cabinet body 10.

[0040] Among them, reference Figure 1 Cabinet 10 can be considered as a vertical cuboid cabinet, defined by a first direction and a second direction. Figure 1 The left-right direction shown is the first direction, and the front-back direction is the second direction. Correspondingly, there is also a top-bottom direction. All six sides of the cabinet 10 are shielded by side walls to create a relatively enclosed space within the cabinet 10. Figure 1 This is a view of the cabinet 10 with the right side wall removed, showing the internal structure of the cabinet 10 and the arrangement of various electrical components.

[0041] Specifically, the cabinet 10 has a first chamber 11, a second chamber 12, and a third chamber 17. These three chambers are relatively independent but can be connected by creating passageways or other means. (Refer to...) Figure 1 In addition to the six side walls, the cabinet 10 has several partitions inside, mainly including a first partition 14, a second partition 15, a third partition 16, and a fourth partition 18. The first partition 14, second partition 15, and third partition 16 are connected sequentially from back to front, while the fourth partition 18 extends from back to front, dividing the interior of the cabinet 10 into three chambers. The third chamber 17 is located below the first partitions 14, second partition 15, and third partition 16; the first chamber 11 is located above the first partitions 14, second partition 15, and third partition 16 and below the fourth partition 18; and the second chamber 12 is located above the fourth partition 18. The first partition 14 extends in the front-to-back direction, the second partition 15 extends in the vertical direction, and the third partition 16 extends in the front-to-back direction. Viewed from the left-right direction, the first partition 14, second partition 15, and third partition 16 form a Z-shaped structure.

[0042] The power assembly 20 and the first electrical component 30 are fixedly installed in the first chamber 11. The second electrical component 40 is partially located in the first chamber 11 and partially located in the third chamber 17. The first heat exchanger 50 is connected to the first chamber 11, and the second heat exchanger 60 is located in the second chamber 12.

[0043] The first chamber 11 and its internal electrical and other components are described below.

[0044] Reference Figure 1 and Figure 2 The power assembly 20 is located in the first chamber 11 and includes a capacitor busbar 21, a power module 22, and a DC capacitor bank 23. The extension planes of the capacitor busbar 21 and the power module 22 are parallel. The capacitor busbar 21 has a first end 211, and the power module 22 has a second end, forming the external connection terminals of the power module 22. Both the first end 211 and the second end are in the form of lead busbars, and their extension direction is perpendicular to a first direction, i.e., perpendicular to the left-right direction. Correspondingly, the first electrical component 30 has a third end 31 for connecting to the first end 211, and the second electrical component 40 has a fourth end 41 for connecting to the second end. The first end 211, the second end, the third end 31, and the fourth end 41 are all in the form of lead busbars, and their extension directions are all perpendicular to the first direction. They are connected to each other via terminal blocks. The first direction is parallel to the extension plane of the capacitor busbar 21.

[0045] The first end 211 is located on one side of the power component 20 along the second direction, and the second end is located on the other side of the power component 20 along the second direction. The second direction is parallel to the extension plane of the capacitor busbar 21 and forms an angle with the first direction. Furthermore, the first end 211 extends along the front end of the second direction corresponding to its position relative to the power component 20, and the second end extends along the rear end of the second direction corresponding to its position relative to the power component 20. The third end 31 of the first electrical component 30 is located in front of the first end 211, and the fourth end 41 of the second electrical component 40 is located between the first end 211 and the second end or behind the second end.

[0046] Furthermore, the first end 211, the second end, the third end 31 and the fourth end 41 each extend only in the same direction, and their respective extension directions are parallel to the extension plane of the capacitor busbar 21.

[0047] Specifically, refer to Figure 2 The capacitor busbar 21 is a plate-shaped component comprising three plates corresponding to the positive, negative, and neutral terminals, respectively. These three plates are stacked and each leads to a terminal, which is the first terminal 211 of the power assembly 20, used for connection to DC electrical devices. Since the capacitor busbar 21 is plate-shaped, it defines an extending plane, which extends horizontally in this embodiment, effectively placing the capacitor busbar 21 horizontally within the first chamber 11. Viewed from top to bottom, the capacitor busbar 21 can be considered rectangular, with its long side extending along the front-to-back direction and its short side extending along the left-to-right direction. The first terminal 211 is a lead busbar, meaning it is a busbar used to lead out terminals. It has a certain width and a specific extension direction, which can be considered the direction the busbar points relative to the main body of the capacitor busbar 21, and this extension direction is perpendicular to the width direction of the busbar. In other words, since the busbar is a row-shaped component with a certain width, its extension direction can only be perpendicular to its width direction, provided that the busbar does not twist. In this embodiment, the width direction of the busbar is parallel to the left-right direction.

[0048] In this embodiment, the first end 211 is located at the front end of the main body of the capacitor busbar 21, and its extension direction points to the front side of the capacitor busbar 21. As a busbar, the first end 211 does not bend upwards or downwards during its extension process; its extension direction is always forward. It should be noted that in other embodiments, the first end 211 may extend forward and then bend downwards or upwards. In this case, its extension direction is still perpendicular to the left-right direction.

[0049] Reference Figure 2The power module 22 is located above the capacitor busbar 21 and includes an electrical connector 221, a power transistor 222, a mounting plate 223, and a terminal block 224. The power transistor 222 is mounted on the mounting plate 223 and connected to the capacitor busbar 21 via the electrical connector 221. The terminal block 224 is connected to the power transistor 222 and forms a second terminal. The mounting plate 223 is a liquid-cooled heat sink, which can dissipate heat from the power transistor 222 mounted on it through liquid cooling.

[0050] Mounting plate 223 is a cuboid plate-shaped component that defines an extended plane. Since power transistors 222 and terminal blocks 224 are both mounted on mounting plate 223, the extended plane corresponding to mounting plate 223 can be considered the extended plane of power module 22. In this embodiment, mounting plate 223 is horizontally positioned above capacitor busbar 21, therefore the overall extended plane of power module 22 is parallel to the extended plane of capacitor busbar 21. Power transistors 222 are attached to the upper and lower surfaces of the mounting portion and connected to the various plates of capacitor busbar 21 via electrical connectors 221, thereby forming an NPC or ANPC three-level topology circuit to achieve DC-AC conversion. Terminal blocks 224 are connected to power transistors 222 and serve as terminals for connecting power module 22 to external electrical devices, forming the second end of power assembly 20. In this embodiment, terminal block 224 is also a busbar, similar to the first end 211 on capacitor busbar 21. The difference is that the second end extends in the direction of the rear side of capacitor busbar 21 and is located at the rear end of power component 20.

[0051] Of course, in other embodiments, the second end may also bend downward or upward after extending backward, so as to better connect with external electrical devices. Such morphological changes caused by bending are improvements that can be made by those skilled in the art according to actual needs.

[0052] As described above regarding the capacitor busbar 21 and power module 22 in the power assembly 20, the power assembly 20 has two sets of terminals: a first terminal 211 and a second terminal. The first terminal 211 is located on the capacitor busbar 21 and is used to connect DC electrical devices, while the second terminal is located on the power module 22 and is used to connect AC electrical devices. Both the first terminal 211 and the second terminal extend only horizontally without bending or twisting, and the first terminal 211 and the second terminal are located at the front and rear ends of the power assembly 20, respectively.

[0053] Furthermore, a DC capacitor bank 23 is provided below the capacitor busbar 21. The power module 22 and the DC capacitor bank 23 are located on two opposite sides of the capacitor busbar 21. The side where the DC capacitor bank 23 is located corresponds to the cold air outlet 51 of the first heat exchanger 50, and the side where the power module 22 is located corresponds to the hot air outlet 52 of the first heat exchanger 50. The DC capacitor bank 23 includes two capacitor arrays 231 that are separated from each other along a second direction. Each capacitor array 231 includes a number of capacitors arranged at intervals, and a shunt channel 232 is formed between the two capacitor arrays 231.

[0054] Specifically, refer to Figure 1 and Figure 2 The DC capacitor bank 23 includes multiple capacitors, which are divided into two capacitor arrays 231 based on their location. Each of these arrays 231 includes a number of capacitors arranged at intervals, and the two arrays 231 are separated in the front-to-back direction to form a shunt channel 232 between them. In each capacitor array 231, the capacitors are arranged in a rectangular shape to match the shape of the capacitor busbar 21, and the number of capacitors arranged in the front-to-back direction in each array 231 is less than the number of capacitors arranged in the left-to-right direction, thereby shortening the size of each array 231 in the front-to-back direction. In addition, a protective shell 233 can be provided around the capacitor array 231. This protective shell 233 is positioned by cooperating with the capacitor busbar 21 and can surround the capacitor array 231 to protect the internal capacitors from adverse conditions such as external impacts.

[0055] Furthermore, the third end 31 of the first electrical component 30 is located in front of the first end 211, and the fourth end 41 of the second electrical component 40 is located between the first end 211 and the second end or behind the second end. In this embodiment, the first electrical component 30 is a DC electrical component and is located in front of the capacitor busbar 21, and the second electrical component 40 is an AC electrical component and is located below the capacitor busbar 21.

[0056] Specifically, refer to Figure 2The first electrical component 30 is a DC switch connected to a DC power supply. A third terminal 31, corresponding in number to the first terminal 211, extends outwards from its rear side. The third terminal 31 is also a lead busbar, extending only horizontally. The first terminal 211 and the third terminal 31 are connected by a terminal block, which is a row-shaped component with the same shape as the first and second terminals. It can be directly attached to the first terminal 211 and the third terminal 31 and then secured together with bolts or other fasteners. Connecting the first terminal 211 and the third terminal 31 via the terminal block, and due to the limitation of the extension direction of the first terminal 211 and the third terminal 31, none of the first terminal 211, the terminal block, or the third terminal 31 needs to be twisted. This achieves good results in terms of wiring distance and the convenience and smoothness of wiring.

[0057] At the same time, refer to Figure 2 The second electrical component 40 includes a reactor 42 and an AC switch 43. The second end of the power component 20 can be directly connected to the AC switch 43, or it can be connected to the reactor 42 first, and then the reactor 42 can be connected to the AC switch 43. In this embodiment, the second end of the power component 20 is connected to the reactor 42, so the fourth end 41 of the second electrical component 40 is located on the reactor 42. Similar to the third end 31 on the first electrical component 30, the fourth end 41 is also in the form of a lead bus, which extends only in the horizontal direction. The second end and the fourth end 41 are connected by a terminal block, which is a row-shaped component with the same shape as the second end and the fourth end 41. It can be directly attached to the second end and the fourth end 41 and then fixed together by bolts or other fasteners. By connecting the second end and the fourth end 41 through the terminal block, and because the extension direction of the second end and the fourth end 41 is limited, the second end, the terminal block, and the fourth end 41 do not need to be twisted, which achieves good results in terms of wiring distance and the convenience and smoothness of wiring. Among them, reference Figure 1 The reactor 42 in the second electrical component 40 is located in the third chamber 17, and the AC switch 43 is located in the first chamber 11.

[0058] As can be seen from the above, when connecting the various terminals via the terminal blocks, the terminal blocks do not need to be twisted or changed direction by other accessories to be connected together. This convenience in wiring is partly due to the fact that the terminals of the power component 20 and the terminals of the first electrical component 30 and the second electrical component 40 are set in the form of lead busbars, and the special setting of the extension direction of these lead busbars. Another reason is the parallel design of the extension planes corresponding to the capacitor busbar 21 and the power module 22 in the power component 20. Since the first direction is parallel to the extension plane of the capacitor busbar 21, the first end 211 and the second end can be based on the extension plane of the capacitor busbar 21 and the power module 22, without twisting or adding other accessories, and can extend outward in a form perpendicular to the first direction, thereby reducing the space occupied by the wiring structure and having a better effect in terms of the indirectness, smoothness and convenience of wiring.

[0059] The following describes the heat dissipation system of the cabinet 10.

[0060] Reference Figure 1 The first heat exchanger 50 has a cold air inlet 51 and a heat seal 52 communicating with the first chamber 11. The cold air inlet 51 and the hot air inlet 52 are located on both sides of the capacitor busbar 21, respectively. In this embodiment, the capacitor busbar 21 is horizontally placed inside the cabinet 10, so the two air inlets of the first heat exchanger 50 are arranged vertically, with the heat seal 51 located on the upper side and the cold air inlet 51 located on the lower side. (Refer to...) Figure 3 The cold air outlet 51 of the first heat exchanger 50 is also adapted to guide the airflow toward the branch channel 232 on the power component 20.

[0061] Reference Figure 3 The power assembly 20 divides the first chamber 11 into a first air zone 111 and a second air zone 112 arranged vertically. At the first end 211 of the power assembly 20, a first channel 113 is formed with the front end of the first chamber 11 along the second direction, and a second channel 114 is formed with the rear end of the second direction. The first heat exchanger 50 is located on the rear side of the power assembly 20 along the second direction, and its cold air outlet 51 is located in the first air zone 111, and its hot air outlet 52 is located in the second air zone 112. The cold air outlet 51 of the first heat exchanger 50 is adapted to guide the airflow to tilt towards the diversion channel 232, and the tilt direction is from the side where the second channel 114 is located to the side where the first channel 113 is located. The capacitor busbar 21 is adapted to guide the airflow through the diversion channel 232, so that one airflow passes through the first channel 113 and the second air zone 112 to reach the hot air outlet 52, and the other airflow passes through the second channel 114 to reach the hot air outlet 52.

[0062] Furthermore, since the mounting plate 223 is arranged parallel to the capacitor busbar 21, a third channel 115 is formed between the mounting plate 223 and the capacitor busbar 21. After the airflow reaches the second air zone 112 from the first channel 113, part of it passes through the third channel 115 to reach the hot air outlet 52 of the first heat exchanger 50. The flow velocity of the cold air increases when passing through the third channel 115, which can improve the heat dissipation efficiency of the power module 22.

[0063] Specifically, the first heat exchanger 50 is an air-to-air heat exchanger, which has a heat exchange duct communicating with the outside and a cooling duct communicating with the first chamber 11. The two ends of the cooling duct are a cold air inlet 51 and a hot air inlet 52, respectively. During operation, the first heat exchanger 50 draws in external cold air, converts it into hot air after heat exchange, and then sends it out. Simultaneously, the cooling duct draws in hot air, converts it into cold air after heat exchange, and then sends it out. The second chamber 12 is connected to the first chamber 11 via a fourth channel 116 and is equipped with an exhaust port 13. The first heat exchanger 50 delivers the converted hot air to the second chamber 12 through the fourth channel 116 and then sends it out through the exhaust port 13. Furthermore, fans can be installed at the hot air inlet 52 and the exhaust port 13 to improve heat exchange efficiency.

[0064] The second heat exchanger 60 is an air-liquid heat exchanger, with a structure similar to the first heat exchanger 50. The difference is that it is connected to the mounting plate 223 in the power assembly 20 via a liquid-cooled pipe 61. It can transport the cooled liquid to the mounting plate 223, and then allow the liquid that has absorbed heat to flow back into the mounting plate, where it is re-formed into cooled liquid after heat exchange. The second heat exchanger 60 also supplies the heated air to the second chamber 12, and the exhaust port 13 can exhaust all the heated air in the second chamber 12 to the outside.

[0065] In addition, the third chamber 17 is also equipped with a cooling air duct, but the third chamber 17 uses natural air cooling. A first air inlet 171 and a second air inlet 172 are provided on the front side wall of the third chamber 17, and a first air outlet 173 and a second air outlet 174 are provided on its rear side wall. Simultaneously, two air ducts are separated inside the third chamber 17 by the arrangement of electrical components. Fans are installed at the first air inlet 171 and the second air inlet 172, which draw in cool air from the outside into the third chamber 17, allowing it to flow along the two air ducts until it reaches the rear of the third chamber 17, and then exit through the first air outlet 173 and the second air outlet 174 respectively.

[0066] This embodiment provides an electrical cabinet in which the capacitor busbar 21 of the power assembly 20 has a first end 211, the power module 22 has a second end, and the first electrical component 30 and the second electrical component 40 have a third end 31 and a fourth end 41, respectively. The first end 211 can be connected to the third end 31 via a terminal block, and the second end can be connected to the fourth end 41 via a terminal block. The extension directions of the first end 211, the second end, the third end 31, and the fourth end 41 are all perpendicular to a first direction, and the first end 211, the second end, the third end 31, and the fourth end 41 are all perpendicular to a first direction. All 41 are in the form of lead busbars. Therefore, when connecting them through the corresponding lead busbars, the lead busbars do not need to be twisted or changed in direction by other accessories, and they can be connected together. At the same time, the capacitor busbar 21 also separates the cold air inlet 51 and the hot air inlet 52 of the first heat exchanger 50, so that the first chamber 11 is divided into two relatively separate spaces by the capacitor busbar 21. The separation of these two spaces forms an air duct from the cold air inlet 51 to the hot air inlet 52 in the first chamber 11. The cold air can flow along the preset path, further improving the heat exchange efficiency of the first heat exchanger 50.

[0067] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. An electrical cabinet, comprising: a cabinet body (10) having a first chamber (11); a power assembly (20) located in the first chamber (11) and comprising a capacitor busbar (21) and a power module (22); the capacitor busbar (21) and the power module (22) are parallel to each other in extension; the capacitor busbar (21) is provided with a first end (211), and the power module (22) is provided with a second end, which form external connection ends of the power assembly (20), respectively; a first electrical component (30) provided with a third end (31) for connecting to the first end (211); a second electrical component (40) provided with a fourth end (41) for connecting to the second end; and a first heat exchanger (50) having a cold air outlet (51) and a hot air outlet (52) communicating with the first chamber (11), and the cold air outlet (51) and the hot air outlet (52) are located on two sides of the capacitor busbar (21), respectively; the first end (211), the second end, the third end (31) and the fourth end (41) are in the form of a lead bar, and the extension directions of the four are perpendicular to a first direction and connected to each other by lead bars; the first direction is parallel to the extension plane of the capacitor busbar (21); the power assembly (20) further comprises a direct current capacitor bank (23); the power module (22) and the direct current capacitor bank (23) are located on two sides of the capacitor busbar (21) away from each other, and the side where the direct current capacitor bank (23) is located corresponds to the cold air outlet (51) of the first heat exchanger (50), and the side where the power module (22) is located corresponds to the hot air outlet (52) of the first heat exchanger (50); the direct current capacitor bank (23) comprises two capacitor arrays (231) separated from each other in a second direction, each capacitor array (231) comprises a plurality of capacitors arranged at intervals, and a shunt passage (232) is formed between the two capacitor arrays (231); the cold air outlet (51) of the first heat exchanger (50) is adapted to direct the airflow to the shunt passage (232); the second direction is parallel to the extension plane of the capacitor busbar (21) and forms an included angle with the first direction. ​ ​ ​ ​ ​ ​ ​ ​ The power assembly (20) separates the first chamber (11) into a first air zone (111) and a second air zone (112), and forms a first passage (113) with the chamber wall of the first chamber (11) at the first end (211) of the power assembly (20) in the front end of the second direction, and forms a second passage (114) with the chamber wall of the first chamber (11) at the second end in the rear end of the second direction; the first heat exchanger (50) is located at the rear side of the power assembly (20) in the second direction, and the cold air outlet (51) thereof is located in the first air zone (111), and the hot air outlet (52) thereof is located in the second air zone (112); the cold air outlet (51) of the first heat exchanger (50) is adapted to guide the air flow to be inclined to the shunt passage (232), and the inclination direction is from the side where the second passage (114) is located to the side where the first passage (113) is located; the capacitor busbar (21) is adapted to guide the air flow to pass through the shunt passage (232) after being shunted, so that one air flow passes through the first passage (113), the second air zone (112) and reaches the hot air outlet (52), and the other air flow passes through the second passage (114) and reaches the hot air outlet (52).

2. An electrical cabinet as claimed in claim 1, characterised in that The first end (211) is located at one side of the power assembly (20) in the second direction, and the second end is located at the other side of the power assembly (20) in the second direction.

3. An electrical cabinet as claimed in claim 2, characterised in that, The first end (211) extends in the front end of the second direction corresponding to its position relative to the power assembly (20); the second end extends in the rear end of the second direction corresponding to its position relative to the power assembly (20); the third end (31) of the first electrical component (30) is located in front of the first end (211), and the fourth end (41) of the second electrical component (40) is located between the first end (211) and the second end or behind the second end.

4. An electrical cabinet as claimed in claim 3, characterised in that, The first end (211), the second end, the third end (31) and the fourth end (41) each extend only in the same direction, and the extension direction of each is parallel to the extension plane of the capacitor busbar (21).

5. An electrical cabinet as claimed in claim 4, characterised in that, The power module (22) comprises an electrical connector (221), a power tube (222), a mounting plate (223) and a terminal row (224); the power tube (222) is mounted on the mounting plate (223) and connected to the capacitor busbar (21) through the electrical connector (221); the terminal row (224) is connected to the power tube (222) and used to form the second end; the mounting plate (223) is arranged parallel to the capacitor busbar (21) and forms a third passage (115) with the capacitor busbar (21), and part of the air flow reaching the second air zone (112) from the first passage (113) passes through the third passage (115) to reach the hot air outlet (52) of the first heat exchanger (50).

6. An electrical cabinet as claimed in claim 5, characterised in that Further comprising a second heat exchanger (60); the mounting plate (223) is a liquid cooling radiator, which is communicated with the second heat exchanger (60) through a liquid cooling pipeline (61).

7. An electrical cabinet as claimed in claim 6, characterised in that The cabinet body (10) further has a second chamber (12) in communication with the first chamber (11) through a fourth channel (116) and provided with an air outlet (13); the first heat exchanger (50) delivers the heat-exchanged hot air to the second chamber (12) through the fourth channel (116); the second heat exchanger (60) delivers the heat-exchanged hot air to the second chamber (12); and the air outlet (13) is used for sending out the hot air in the second chamber (12).

8. An electrical cabinet as claimed in claim 7, characterised in that, With respect to the cabinet body (10), the first direction is the left-right direction, the second direction is the front-rear direction, the power module (22) is located above the capacitor busbar (21), the direct-current capacitor cell (23) is located below the capacitor busbar (21), the second chamber (12) is located above the first chamber (11), the first electrical component (30) is a direct-current electrical component and is located in front of the capacitor busbar (21), and the second electrical component (40) is an alternating-current electrical component and is located below the capacitor busbar (21).

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