An electrical cabinet

Abstract

The present invention discloses an electrical cabinet, comprising a cabinet body, high-protection components, electrical components, and a heat exchange device; an air passage cavity is provided on the top of the cabinet body, and a heat dissipation cavity is provided on the bottom of the cabinet body, wherein a relatively closed and independent protection cavity is provided between the air passage cavity and the heat dissipation cavity; the high-protection components are placed in the protection cavity; the electrical components are placed in the heat dissipation cavity; the heat exchange device comprises a liquid cooling unit placed in the air passage cavity and a radiator placed in the protection cavity for dissipating heat for the high-protection components, the radiator being provided with a coolant flow channel, and the liquid supply end and liquid return end of the liquid cooling unit being both connected to the coolant flow channel. In the electrical cabinet of the present invention, the protection cavity in the cabinet body has good protection, and the high-protection components in the protection cavity have high heat dissipation efficiency, and the heat island effect is not obvious.

Description

Technical Field

[0001] The present invention relates to the field of electrical technology, and in particular to an electrical cabinet. Background Art

[0002] Photovoltaic inverters, energy storage converter cabinets and other electrical cabinets usually include IGBT power modules and capacitor modules. IGBT power modules and capacitor modules have high heat dissipation and protection requirements. In particular, IGBT generates a large amount of heat. The existing technology, such as patent CN111465289A, see Figure 1 The second air duct 25 is set up to run through the high-heat area 22 from top to bottom, and is mainly used to independently dissipate heat for the inverter module 5 with high protection requirements and high heat generation. On the one hand, the inverter module 5 dissipates heat through the second air duct 25, and on the other hand, it can be assisted by the heat exchanger 4 to ensure that the inverter module 5 with high heat generation can effectively dissipate heat. At the same time, the heat exchanger 4, as an auxiliary heat dissipation device, can further enhance the heat dissipation effect inside the entire main protection area 2 on the basis of independent heat dissipation of the first air duct 24 and the second air duct 25. Capacitor busbar module 6 ( Figure 1 The right side of the cabinet (numbered 6) dissipates heat through the heat exchanger 4 and the turbulent fan 10. The air outlet of the turbulent fan 10 is located directly opposite the capacitor busbar module 6. The air from the turbulent fan 10 passes through the capacitor busbar module 6 and can be circulated and dissipated through the heat exchanger 4. The reactor module 8 is placed at the bottom of the cabinet and directly below the air inlet of the first air duct 24. The cold air flows through the reactor module 8 to remove heat and is then discharged from the cabinet 1 through the first air duct 24. In this solution, both the inverter module and the capacitor module are cooled by air cooling, which has poor protection. In addition, the second air duct 25 occupies the cold air of the heat exchanger 4, causing the cold air blown to the main protection area 2 to increase in temperature after passing through the second air duct, which is not conducive to the heat dissipation of other components in the main protection area 2. The first air duct 24, which dissipates heat from the reactor module 8, extends into the primary protection zone. Because the walls of the first air duct 24 can be made of sheet metal with good thermal conductivity, the sealing level is poor, resulting in air leakage and radiating heat from the reactor 8 through the walls of the first air duct 24 into the primary protection zone, raising the temperature of the primary protection zone 2. Furthermore, due to the vertical extension of the first and second air ducts 24 and 25, the air outlets of the entire cabinet must be located on the sides to prevent water ingress. In actual applications, multiple power cabinets are often spaced apart in the front-to-back direction. As a result, airflow between the cabinets interferes with each other. For example, hot air from an upstream power cabinet can enter the cold air inlet of a downstream power cabinet. For example, the hot air from two power cabinets blows against each other, disrupting the airflow and causing mutual interference. These factors often result in a "heat island" effect, increased equipment temperature rise, and ultimately equipment derating. Existing solutions often increase the distance between power cabinets and change their layout. However, increasing the spacing between power cabinets increases the floor space required, and even with increased spacing, thermal turbulence still has an impact. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology and provide an electrical cabinet, wherein the protective cavity inside the cabinet has good protection, the high-protection components in the protective cavity have high heat dissipation efficiency, and the heat island effect is not obvious.

[0004] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Technical solution 1, an electrical cabinet, including a cabinet body, a wind cavity provided on the top, a heat dissipation cavity provided on the bottom, a relatively closed and independent protective cavity provided between the wind cavity and the heat dissipation cavity; a high-protection component placed in the protective cavity; an electrical component placed in the heat dissipation cavity; and a heat exchange device, including a liquid cooling unit placed in the wind cavity and a radiator placed in the protective cavity for dissipating heat for at least part of the high-protection component, the radiator being provided with a coolant flow channel, and the liquid supply end and the liquid return end of the liquid cooling unit being connected to the coolant flow channel.

[0006] Based on Technical Solution One, Technical Solution Two is also provided. Technical Solution Two also includes an air heat exchanger, which is provided with a cold air outlet for delivering cold air to the protective cavity and a hot air outlet for recovering hot air from the protective cavity; the high-protection component includes a high-heating component and a low-heating component, and the radiator is a liquid cooling plate and is used to dissipate heat for the high-heating component.

[0007] Based on technical solution 2, technical solution 3 is also provided. In technical solution 3, the hot air outlet is higher than the cold air outlet, and the high heating element is close to the hot air outlet and lower than the hot air outlet.

[0008] Based on technical solution three, there is also a technical solution four. In technical solution four, the cabinet is provided with a first side wall and a second side wall parallel to and opposite to each other along a first direction; the air cavity is provided with a main air inlet on the first side wall, and an air outlet close to the second side wall is provided on the top of the cabinet; the cabinet is provided with an air inlet connecting the air cavity and the protective cavity; the liquid cooling unit includes an air-liquid heat exchanger and an air flow drive module, and the liquid supply end and the liquid return end of the air-liquid heat exchanger are connected to the coolant flow channel of the radiator; the air flow drive module is used to drive The wind flows to the exhaust port through the air-liquid heat exchanger; the protective cavity is provided with a third air inlet on the second side wall, and the air heat exchanger is installed on the inner surface of the second side wall; the air heat exchanger is provided with a first air flow channel and a second air flow channel, the first air flow channel connects the third air inlet and the air outlet, and the second air flow channel is provided with the cold air outlet and the hot air outlet; the air flow driving module also drives the wind to flow from the third air inlet through the air outlet to the exhaust port; the first air flow channel and the second air flow channel exchange heat with each other to take away the heat of the second air flow channel.

[0009] Based on Technical Solution 4, Technical Solution 5 is also provided. In Technical Solution 5, the low-heat-generating component includes a DC electrical component, an AC electrical component and a capacitor module. The DC electrical component is close to the first side wall, and the AC electrical component is placed at the bottom of the protective cavity and close to the cold air outlet of the air heat exchanger; the capacitor module is located between the DC electrical component and the AC electrical component and below the high-heat-generating component.

[0010] Based on technical solution five, there is also a technical solution six. In technical solution six, the lower surface of the capacitor module is provided with a heat dissipation surface parallel to the horizontal direction, and the upper surface of the capacitor module is opposite to the radiator part and forms a wind gap.

[0011] Based on technical solution five or six, there is also a technical solution seven. In technical solution seven, the electrical component includes an inductor extending in a vertical direction; the heat dissipation cavity is respectively provided with a first air inlet and a first air outlet at the upper end of the first side wall and the lower end of the second side wall, the first air outlet is away from the third air inlet, and the first air inlet and the first air outlet are connected to form a first air duct; the inductor is placed in the first air duct.

[0012] Based on Technical Solution Seven, Technical Solution Eight is also provided, which further includes a cover body; the cabinet body is provided with a partition plate, and the upper and lower surfaces of the partition plate form the cavity walls of the protective cavity and the heat dissipation cavity respectively; the cover body is arranged outside the reactor and connects the first air inlet and the first air outlet to form the first air duct; there is an insulating gap between the cover body and the partition plate.

[0013] Based on Technical Solution Eight, Technical Solution Nine is also provided. In Technical Solution Nine, the partition plate enables the heat dissipation cavity to form a first zone and a second zone connected along the air inlet direction, the first zone is higher than the second zone, and the reactor is placed in the first zone; the partition plate also enables the protective cavity to form a third zone and a fourth zone connected along the air inlet direction, the third zone and the fourth zone are respectively located above the first zone and the second zone, and the high-heat-generating component is located above the fourth zone; the DC electrical component is placed in the third zone, the AC electrical component is placed in the fourth zone, and the capacitor module spans the third zone and the fourth zone and is located between the AC electrical component and the high-heat-generating component.

[0014] Based on technical solution eight or nine, there is also a technical solution ten. In technical solution ten, the electrical component also includes a fuse, a first connector and a second connector. The fuse is placed in the first area and is suitable for connecting DC electrical components. The first connector is located in the first area and placed below the fuse; the second connector is located in the second area and placed below the AC electrical components; the heat dissipation cavity is also provided with a second air inlet and a second air outlet, the second air inlet and the second air outlet are connected to form a second air duct, the first air duct is at least partially located in the second air duct, and the fuse, the first connector and the second connector are placed in the second air duct.

[0015] From the above description of the present invention and its preferred embodiments, it can be seen that compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0016] After continuous observation, experimentation and research, the applicant has learned that the reason why the technical problem of "poor protection of the main protection area and low heat dissipation efficiency" in the existing technical solution is that the layout of devices in the main protection area is unreasonable and air cooling is used for heat dissipation.

[0017] In Technical Solution 1, "high-protection components" refer to components with relatively high protection requirements. A relatively independent and sealed protective cavity indicates a high level of protection (waterproof and dustproof). This also means that the interior of the protective cavity structurally does not encroach upon other cavities (the airflow cavity and the heat dissipation cavity), such as where the heat dissipation cavity's air duct extends into the protective cavity. This leaves ample space within the protective cavity for the installation of high-protection components, making them less susceptible to heat radiation from electrical components and creating a layout that is optimal for heat dissipation, thereby improving the heat dissipation efficiency of the high-protection components.

[0018] The airflow cavity houses a liquid cooling unit, which may be at risk of leakage. A protective chamber is located between the airflow cavity and the heat dissipation cavity. Because the protective chamber is relatively independent and airtight, it completely separates the airflow cavity from the heat dissipation cavity. This relatively airtight protective chamber not only enhances its own protection, preventing leakage from the airflow cavity into the protective chamber, but also serves as a barrier to prevent leakage into the heat dissipation cavity, thereby preventing damage to electrical components. Leakage issues in the piping between the liquid cooling unit and the radiator can be addressed by improving the protective properties of the connecting pipes. This is beyond the scope of this application. The liquid cooling unit leakage issues discussed in this application primarily focus on leakage within the portion of the liquid cooling unit within the airflow cavity.

[0019] Among them, the high protection components in the protection cavity can dissipate heat at least partially through liquid cooling. On the one hand, the liquid cooling method is easier to control and has high heat dissipation efficiency than the air cooling method. On the other hand, a relatively closed structure can be formed in the protection cavity, thereby improving the protection of the protection cavity. Among them, the liquid cooling unit of the heat exchange device is placed in the air cavity at the top. Therefore, when the liquid cooling unit dissipates heat by air cooling, the air inlet of the air cavity is also located at the top. The air inlet is far away from the ground and has a lower air inlet temperature, which makes the heat dissipation efficiency of the liquid cooling unit high, thereby ensuring that the high protection components have high heat dissipation efficiency; due to the liquid cooling unit There is no concern about water ingress, so the air outlet does not have to be opened on the side of the cabinet, but can be opened on the top of the cabinet, so that it is not easy to cause heat flow disturbance to the downstream electrical cabinet when multiple electrical cabinets are used in parallel, and even if the heat flow flows out from the side of the top of the cabinet, it is not easy to affect the downstream electrical cabinet due to the low density of hot air; since the liquid cooling unit is placed on the top, the side of the cabinet is not occupied, which is convenient for parallel operation of multiple electrical cabinets or side by side in the horizontal direction; when the liquid cooling unit dissipates heat by air conditioning or other means, similarly, the air inlet and hot air outlet of the air conditioner are also located on the top of the cabinet, which has the same effect.

[0020] In Technical Solution 2, the high-protection components within the protective cavity dissipate heat primarily through liquid cooling and air cooling. High-heat-generating components dissipate heat through liquid cooling, which has high heat dissipation efficiency, while low-heat-generating components dissipate heat through air cooling, which also has high heat dissipation efficiency. Furthermore, since both the air heat exchanger and the heat exchange device dissipate heat through external circulation, the protective properties of the protective cavity can be significantly improved. It can be seen that in this technical solution, the combined heat dissipation method of liquid cooling and air cooling maximizes the heat dissipation efficiency of the high-protection components within the protective cavity, providing excellent protective properties. This also facilitates the paralleling or horizontal side-by-side use of electrical cabinets, and also facilitates reducing the spacing between power cabinets.

[0021] In technical solution three, since the hot air outlet is higher than the cold air outlet, the cold air of the air heat exchanger can gradually take away the heat of the high-protection components in the protective cavity during the upward flow in the protective cavity, and the air circulation is good; the high-heating component is close to the hot air outlet of the air heat exchanger, so the cold air flow flowing out of the cold air outlet of the air heat exchanger can first take away the heat of the low-heating component in the protective cavity, and then take away the heat of the high-heating component, thereby ensuring the heat dissipation efficiency of the low-heating component; the high-heating component is lower than the hot air outlet, so the resistance is small when the hot air flows back, and since the density of hot air in the windflow is less than that of air, the cold air is below and the hot air is above when passing through the high-heating component during the return flow, so that the air heat exchanger can dissipate heat for the low-heating component while also dissipating heat for the high-heating component.

[0022] In technical solution four, the liquid cooling unit dissipates heat through air cooling, which is low-cost; the air heat exchanger and the air-liquid heat exchanger share the airflow drive module, and thus share the exhaust port, so that the hot air generated in the protective cavity is discharged from the exhaust port on the top of the cabinet, so that when multiple electrical cabinets are used side by side in the first direction, the hot air from the exhaust port of the upstream electrical cabinet will not affect the main air inlet of the downstream electrical cabinet; wherein, the air heat exchanger is mounted on the inner surface of the second side wall, which is more beautiful than being mounted on the outer surface of the second side wall. If the air heat exchanger is mounted on the outer surface of the second side wall, the hot air from the first air duct will easily flow into the main air inlet of the downstream cabinet.

[0023] In technical solution five, among the low-heat-generating components, the capacitor module has the largest heat generation. The capacitor module is located between the DC electrical components and the AC electrical components along the first direction and below the high-heat-generating components, which is convenient for wiring. The cold air from the air heat exchanger passes through the AC electrical components, the capacitor module, and the DC electrical components, and then flows through the high-heat-generating components and is recovered to the hot air outlet. Since the AC electrical components have a low heat generation, the temperature of the cold air is still relatively low after passing through the AC electrical components, which can effectively take away the heat from the capacitor module. Since the DC electrical components are close to the first side wall, the heat of the DC electrical components can be radiated outward through the first side wall, making the heat dissipation efficiency of the low-heat-generating components high.

[0024] In Technical Solution 6, the lower surface of the capacitor module is provided with a heat dissipation surface parallel to the horizontal direction, which is beneficial to the electrical coupling between the capacitor module and the high-heat-generating component, and also allows the cold air to better dissipate heat for the capacitor module. A wind gap is formed between the radiator and the upper surface of the capacitor module. The wind speed in the wind gap is the fastest, so that the cold air can simultaneously carry away the heat of the capacitor module and the high-heat-generating component. It can be seen that the capacitor module is basically set horizontally, so the wind flow can flow around the entire capacitor module, the heat dissipation efficiency of the capacitor module is relatively high, and the capacitor module can also guide the wind flow to the DC electrical components away from the cold air outlet of the air heat exchanger, thereby improving the heat dissipation efficiency of the DC electrical components.

[0025] In the seventh technical solution, the electrical components include a reactor, which is placed in the first air duct of the heat dissipation cavity. On the one hand, because the reactor is heavy, it is placed at the bottom of the cabinet for better load-bearing performance. On the other hand, the first air inlet is kept away from the ground and the first air outlet is closer to the ground, thereby preventing the airflow entering the first air duct from being hot air when the ground temperature is high, and ensuring that the airflow entering the first air duct is cold air away from the ground. The heat dissipation efficiency of the reactor is high. At the same time, since the first air outlet is low, the hot air from the first air outlet moves upward after coming out in a basically parabolic trajectory, thereby avoiding heat The wind entering the third air inlet affects the heat dissipation of the protective cavity, and also makes it difficult to affect the air inlet of the downstream adjacent power cabinet when multiple power cabinets are used side by side along the horizontal first direction. Since the reactor is placed in an independent first air duct, the heat is more concentrated, so that the cold air entering the first air duct from the first air inlet can pass through the reactor completely from top to bottom, thereby quickly taking away the heat of the reactor. The heat dissipation efficiency of the reactor is high. After such an arrangement, the hot air of the entire electrical cabinet is discharged from the exhaust port on the top and the first air outlet at the bottom, which is not easy to cause turbulence to the air inlet of the downstream electrical cabinet.

[0026] In Technical Solution 8, there is an insulating gap between the cover and the partition plate. The insulating gap reduces the heat conduction efficiency between the cover and the partition plate, thereby preventing the heat of the reactor from dissipating into the protective cavity by radiation, and improving the heat dissipation efficiency of the entire cabinet.

[0027] In Technical Solution Nine, high-heat generating components are placed in the fourth zone, and the reactor is placed in the first zone, and they are basically arranged diagonally with the reactor, so that the two electrical components with high heat generation are kept as far away as possible, further improving the heat dissipation efficiency; and the DC electrical components are placed in the third zone, and the AC electrical components are placed in the fourth zone. The capacitor module spans the third and fourth zones and is located between the AC electrical components and the high-heat generating components, which is also conducive to wiring and the stratified flow of airflow in the protective cavity, and has high heat dissipation efficiency.

[0028] In Technical Solution 9, the fuse is placed in the first zone and is suitable for connecting to DC electrical components. The first connector is located in the first zone and below the fuse, and the second connector is located in the second zone and below the AC electrical components, facilitating wiring operations. The fuse, first connector, and second connector are placed in the second air duct, improving the heat dissipation efficiency of these electrical components. Because the fuse, first connector, and second connector generate relatively low heat, the first air duct, at least partially located within the second air duct, can also remove heat from the first air duct during the heat dissipation process, further improving the heat dissipation efficiency of the first heat-generating component. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural diagram of the prior art;

[0031] Figure 2 Schematic diagram of an electrical cabinet according to an embodiment of the present invention Figure 1 ;

[0032] Figure 3 Schematic diagram of an electrical cabinet according to an embodiment of the present invention Figure 2 ;

[0033] Figure 4 This is a top view of the electrical cabinet after the cabinet top plate is hidden according to an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the interior of an electrical cabinet according to an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the interior of the hidden portion of the cover of the electrical cabinet according to an embodiment of the present invention.

[0036] Description of main reference numerals:

[0037] Cabinet 10; air passage 10A; air outlet 101; protective cavity 10B; heat dissipation cavity 10C; upper air outlet chamber 10D; lower air outlet chamber 10F; first air duct 01; second air duct 02; first side wall 11; main air inlet 111; first air inlet 112; second air inlet 113; second side wall 12; first air outlet 121; second air outlet 122; third air inlet 123; first abutting wall 13; first air inlet 131; third air outlet 132; second abutting wall 14; second air inlet 141; fourth air outlet 142; support plate 15; air passage 151; Partition plate 16; air guide surface 161; inner partition 17; air flow outlet 171; cover body 18; fan module 19; first fan 191; second fan 192; thermal insulation gap 03; heat exchange device 20; air-liquid heat exchanger 21; heat exchange plate 211; radiator 22; air flow drive module 30; high-heat generating component 40; low-heat generating component 50; DC electrical component 51; capacitor module 52; heat dissipation surface 521; AC electrical component 53; air heat exchanger 60; cold air outlet 61; hot air outlet 62; reactor 70; electrical connector 80; fuse 81; first connector 82; second connector 83. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] In the claims, description and drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" is for the purpose of distinguishing different objects rather than for describing a specific order.

[0040] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise expressly defined, directional words such as the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific scope of protection of the present invention.

[0041] In the claims, description and above-mentioned drawings of the present invention, unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two parties, that is, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0042] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0043] See also Figure 2-6 , Figure 2-6 An electrical cabinet is shown, comprising a cabinet body 10 , a heat exchange device 20 , an air heat exchanger 60 , a reactor 70 and an electrical connector 80 .

[0044] See also Figure 2-4 The cabinet 10 is in the shape of a rectangular parallelepiped. The cabinet 10 is provided with a first side wall 11 and a second side wall 12 parallel to and opposite to each other along a first direction. The cabinet 10 is provided with a first abutting wall 13 and a second abutting wall 14 parallel to and opposite to each other along a second direction perpendicular to the first direction. Figure 4 The middle direction is up and down, the second direction is Figure 4 The middle represents the left and right directions.

[0045] In this embodiment, the cabinet 10 is provided with a support plate 15 and a partition plate 16. Figure 5-6 The support plate 15 divides the cabinet 10 into an upper area and a lower area. The upper area forms an airflow cavity 10A. The partition plate 16 divides the lower area into a middle area and a bottom area. The middle area forms a protective cavity 10B, and the bottom area forms a heat dissipation cavity 10C. Specifically, the cabinet 10 has an airflow cavity 10A at the top and a heat dissipation cavity 10C at the bottom. The cabinet 10 has a protective cavity 10B between the airflow cavity 10A and the heat dissipation cavity 10C. The support plate 15 extends horizontally, and the partition plate 16 is Z-shaped overall. The partition plate 16 is formed by two horizontal segments and a vertical segment. The vertical segment connects the two horizontal segments to form the Z-shaped partition plate.

[0046] In this embodiment, since the projection of the partition plate 16 along the second direction is Z-shaped, the partition plate 16 forms a first area ( Figure 6 Middle left) and the second zone ( Figure 6 The first zone is higher than the second zone, and the partition plate 16 also forms a third zone ( Figure 6 Center left) and the fourth zone ( Figure 6 The third and fourth zones are located above the first and second zones, respectively, so that the bottom surface of the third zone is higher than the bottom surface of the fourth zone. It should be understood that the support plate 15 and the partition plate 16 should be sealed and connected to the side plates of the cabinet, so that the protective cavity 10B is relatively independent and sealed. The relative independence and sealing of the protective cavity 10B means that the protective cavity 10B has a higher level of protection (waterproof and dustproof), and also means that the interior of the protective cavity 10B does not structurally encroach on other chambers (the air passage chamber and the heat dissipation chamber), such as the air duct of the heat dissipation chamber 10C extending into the protective cavity. Therefore, there is enough space in the protective cavity 10B for the installation of the high-protection components described below, so that the high-protection components are not easily affected by the heat radiation of the electrical components, and can also form a layout that is most conducive to heat dissipation, thereby improving the heat dissipation efficiency of the high-protection components.

[0047] See also Figure 2-3 The air passage cavity 10A is provided with a main air inlet 111 along the first direction on the first side wall 11, and an air outlet 101 is provided on the top, and the air outlet 101 is close to the second side wall 12; the air passage cavity 10A is also provided with a first air inlet 131 and a second air inlet 141 on the first abutting wall 13 and the second abutting wall 14 respectively, that is, the side of the air passage cavity 10A is also provided with a relative first air inlet 131 and a second air inlet 141 along the second direction.

[0048] See also Figure 3 The protective cavity 10B is provided with a third air inlet 123 on the second side wall 12. Figure 5-6The cabinet 10 is further provided with an air outlet 151 connecting the protective cavity 10B and the air outlet cavity 10A. The air outlet 151 is away from the main air inlet 111 and close to the second side wall 12. In this embodiment, the air outlet 151 is opened on the support plate 15.

[0049] See also Figure 6 The heat dissipation cavity 10C is provided with a first air inlet 112 and a second air inlet 113 on the first side wall 11, and a first air outlet 121 and a second air outlet 122 on the second side wall 12; the first air inlet 112 and the first air outlet 121 are connected to form a first air duct 01, and the second air inlet 113 and the second air outlet 122 are connected to form a second air duct 02.

[0050] Specifically, see Figure 5-6 An inner partition 17 is provided within the heat dissipation chamber 10C between the first air outlet 121 and the second air outlet 122 to divide the heat dissipation chamber 10C into an upper air outlet chamber 10D corresponding to the first air inlet 112, the second air inlet 113, and the second air outlet 122, and a lower air outlet chamber 10F corresponding to the first air outlet 121. An air flow port 171 is provided on the inner partition 17 to connect the first air inlet 112 and the first air outlet 121. A portion of the first air duct 01 is formed between the first air inlet 112 and the air flow port 171, and another portion of the first air duct 01 is formed between the air flow port 171 and the first air outlet 121. The portion of the upper air outlet chamber 10D outside the first air duct 01 forms the second air duct 02. Therefore, a portion of the first air duct 01 is located within the second air duct 02. Figure 2-3 The lower air outlet chamber 10F further forms a third air outlet 132 and a fourth air outlet 142 on the first abutting wall 13 and the second abutting wall 14 , which are communicated with the air flow port 171 .

[0051] In this embodiment, the cabinet 10 is provided with a cover 18, one end of which is connected to the first air inlet 112 and the other end is connected to the air outlet 171 to form a part of the first air duct 01. The projection of the cover 18 along the second direction is L-shaped and has a horizontal section and a vertical section.

[0052] In a preferred embodiment, cover 18 is located in the first zone of heat dissipation cavity 10C, forming a wind clearance between cover 18 and first abutting wall 13 and second abutting wall 14. The inner surface of heat dissipation cavity 10C, facing away from second sidewall 12, is provided with a wind guide surface 161, facing cover 18 and parallel to first sidewall 11. Wind guide surface 161 forms a wind clearance with cover 18 and is vertically spaced from inner partition 17. A thermal insulation gap 03 exists between the top surface of cover 18 and the wall of heat dissipation cavity 10C. The wind clearance between cover 18 and wind guide surface 161 also serves as a thermal insulation function, also serving as the thermal insulation gap 03. In this embodiment, the vertical section of partition plate 16, facing first sidewall 11, forms wind guide surface 161.

[0053] Still see Figure 6 The first air inlet 112 and the first air outlet 121 are respectively located at the upper end and the lower end of the heat dissipation cavity 10C, the second air inlet 113 and the second air outlet 122 are both located between the first air inlet 112 and the first air outlet 121, and the second air inlet 113 is higher than the second air outlet 122.

[0054] Specifically, in this embodiment, the cabinet 10 includes a fan module 19 corresponding to the heat dissipation cavity 10C. The fan module 19 is mounted on the first sidewall 11 and is used to supply air to the first air inlet 112 and the second air inlet 113. The air volume supplied to the first air inlet 112 is greater than that supplied to the second air inlet 113. In this embodiment, the fan module 19 includes a first fan 191 opposite the first air inlet 112 and a second fan 192 opposite the second air inlet 113. Both the first fan 191 and the second fan 192 are air supply fans, and the power of the first fan 191 is greater than that of the second fan 192. Mounting the fan module 19 on the first sidewall 11 reduces the temperature of the fan module 19 compared to mounting it on the second sidewall 12, thus making it less susceptible to damage.

[0055] See also Figure 3-6 The heat exchange device 20 includes a liquid cooling unit positioned within the air passage 10A and a radiator 22 positioned within the protective chamber 10B for dissipating heat from at least a portion of the high-protection components. The radiator 22 is provided with a coolant flow channel, with both the liquid supply and return ports of the liquid cooling unit connected to the coolant flow channel. In this embodiment, the liquid cooling unit includes an air-to-liquid heat exchanger 21 positioned within the air passage 10A and supported by a support plate 15, and an airflow drive module 30. In this embodiment, the radiator 22 is a liquid cooling plate. The air-to-liquid heat exchanger 21 is connected to the liquid inlet and outlet of the radiator 22, thereby supplying cold liquid to the radiator 22 and recovering hot liquid from the radiator 22, thereby achieving a liquid cooling cycle. The air-to-liquid heat exchanger 21 can utilize existing technology and will not be further described here. The airflow drive module 30 is positioned at the exhaust port 101 to drive airflow from the main air inlet 111 through the air duct to the exhaust port 101. It should be understood that in this embodiment, the airflow drive module 30 should have a high level of protection. The air-liquid heat exchanger 21 dissipates heat through the main air inlet 111, the first air inlet 131, the second air inlet 141, the airflow drive module 30, and the exhaust port 101, with high heat exchange efficiency. The side walls of the cabinet 10 other than the first side wall 11 and the second side wall 12, namely the first abutting wall 13 and the second abutting wall 14, do not require air intake and exhaust, and do not require maintenance. Therefore, these side walls can be used to connect with other cabinets 10 without affecting the operation, heat dissipation, and maintenance of the electrical cabinet itself. When multiple electrical cabinets are connected in parallel along the second direction, only the outermost first air inlet 131 and the second air inlet 141 can take in air. Due to the limitation of wind pressure, the air passage 10A of the electrical cabinet in the middle does not allow air to enter the first air inlet 131 and the second air inlet 141.

[0056] Still see Figure 5-6 , the high-protection component is placed in the protective cavity 10B and includes a high-heating component 40 and a low-heating component 50; the high-protection component means that the protection requirement of the component is relatively high; the high-heating component 40 is dissipated by the radiator 22, and the high-heating component 40 is an inverter module in this embodiment, so the water pipe of the air-liquid heat exchanger 21 also passes through the support plate 15 and is connected to the radiator 22; the low-heating component 50 includes a DC electrical component 51, an AC electrical component 53 and a capacitor module 52, the DC electrical component 51 is close to the first side wall 11, and the AC electrical component 53 is close to the second side wall 12 and is placed at the bottom of the protective cavity 10B and close to the cold air outlet 61 of the air heat exchanger 60; the capacitor module 52 is located between the DC electrical component 51 and the AC electrical component 53 along the first direction and is located below the high-heating component 40. In this embodiment, the capacitor module 52 includes a capacitor mounting plate, a plastic busbar, multiple capacitors, and a protective plate. One end of each capacitor is mounted on the capacitor mounting plate and limited by the protective plate, and the other end is electrically connected to the plastic busbar. The protective plate surrounds the outside of each capacitor and forms a rectangular parallelepiped structure with the capacitor mounting plate and the plastic busbar. In this embodiment, the capacitor mounting plate and the plastic busbar are parallel to the horizontal direction. A number of heat dissipation holes are provided on the capacitor mounting plate and the protective plate. Therefore, the heat of each capacitor is mainly dissipated through the capacitor mounting plate and the protective plate, but mainly through the capacitor mounting plate. In this embodiment, the capacitor mounting plate is parallel to the horizontal direction. The side of the capacitor mounting plate facing away from the plastic busbar forms a heat dissipation surface 521. That is, the lower surface of the capacitor module 52 is provided with a heat dissipation surface 521 parallel to the horizontal direction. The upper surface of the capacitor module 52 is partially opposite to the radiator 22 and forms a wind clearance.

[0057] The high-heat generating component 40 is located above the fourth zone. The DC electrical component 51 is placed in the third zone, and the AC electrical component 53 is placed in the fourth zone. The capacitor module 52 spans the third and fourth zones and is vertically located between the AC electrical component 53 and the high-heat generating component 40. The electrical connections within the protective cavity 10B are as follows: the DC electrical component 51 is connected to the capacitor module 52, the capacitor module 52 is connected to the high-heat generating component 40, and the high-heat generating component 40 is connected to the AC electrical component 53.

[0058] In this embodiment, the air-liquid heat exchanger 21 of the heat exchange device 20 is placed in the air cavity 10A at the top, so the air inlet of the heat exchange device 20 is also located at the top. The air inlet is far away from the ground and therefore has a lower air inlet temperature, so that the heat dissipation efficiency of the air-liquid heat exchanger 21 is high, thereby ensuring that the high heat dissipation efficiency of the high-heating element 40 is high; since the air-liquid heat exchanger 21 has no concerns about water ingress, the air outlet can be opened at the top of the cabinet 10, so that it is not easy to generate heat flow disturbance to the downstream electrical cabinet when multiple electrical cabinets are used in parallel; since the air-liquid heat exchanger 21 is placed at the top, the side of the cabinet 10 is not occupied, which is convenient for paralleling multiple electrical cabinets or using them side by side in the horizontal direction.

[0059] The air heat exchanger 60 is installed on the inner surface of the second side wall 12; the air heat exchanger 60 is provided with a cold air outlet 61 for delivering cold air to the protective cavity 10B and a hot air outlet 62 for recovering hot air from the protective cavity 10B; wherein, the hot air outlet 62 and the cold air outlet 61 are both facing the first side wall 11, and the hot air outlet 62 is higher than the cold air outlet 61. In actual application, an exhaust fan is also installed at the hot air outlet 62, and the axis of the exhaust fan is parallel to the first direction. The air heat exchanger 60 is provided with a first air flow channel and a second air flow channel, the first air flow channel connects the third air inlet 123 and the air outlet 151, and the second air flow channel connects the cold air outlet 61 and the hot air outlet 62; the airflow driving module 30 also drives the wind from the third air inlet 123 through the air outlet 151 to the exhaust outlet 101; the first air flow channel and the second air flow channel exchange heat with each other to take away the heat of the second air flow channel. The hot air vent 62 is higher than the cold air vent 61. As the cold air from the air heat exchanger 60 flows upward through the protective cavity 10B, it gradually removes heat from the high-protection components within the protective cavity 10B, improving air circulation. Attaching the air heat exchanger 60 to the inner surface of the second sidewall 12 provides a more aesthetically pleasing design than attaching it to the outer surface. Attaching the air heat exchanger 60 to the outer surface of the second sidewall 12 also allows the hot air from the first airflow path to flow more easily into the main air inlet 111 of the cabinet 10 downstream.

[0060] In this embodiment, the air heat exchanger 60 and the air-liquid heat exchanger 21 share the airflow drive module 30, and thus share the exhaust port 101, so that the hot air generated by the protective cavity 10B is discharged from the exhaust port 101 at the top of the cabinet body 10. Therefore, when multiple electrical cabinets are used side by side along the first direction, the hot air from the exhaust port 101 of the upstream electrical cabinet will not affect the main air inlet 111 of the downstream electrical cabinet.

[0061] The high-heat-generating element 40 is located near the hot air outlet 62 of the air heat exchanger 60. Therefore, the cold air flow from the cold air outlet 61 of the air heat exchanger 60 can first remove heat from the low-heat-generating element 50 in the protective cavity 10B, and then remove heat from the high-heat-generating element 40, thereby ensuring the heat dissipation efficiency of the low-heat-generating element 50. The high-heat-generating element 40 is lower than the hot air outlet 62, so the resistance to the hot air return is small. Moreover, because the density of hot air in the airflow is lower than that of air, the cold air flows downward while the hot air flows upward when passing through the high-heat-generating element 40 during the return flow. This allows the air heat exchanger 60 to dissipate heat for the high-heat-generating element 40 while simultaneously dissipating heat for the low-heat-generating element 50.

[0062] The capacitor module 52 in the low-heating component 50 generates the most heat. The capacitor module 52 is located between the DC electrical component 51 and the AC electrical component 53 and below the high-heating component 40, facilitating wiring. The cold air from the air heat exchanger 60 passes through the AC electrical component 53, the capacitor module 52, and the DC electrical component 51, then flows through the high-heating component 40 and is recovered to the hot air outlet 62. Since the AC electrical component 53 generates less heat, the cold air remains relatively cool after passing through the AC electrical component 53, effectively removing heat from the capacitor module 52. The lower surface of the capacitor module 52 is provided with a heat dissipation surface 521 parallel to the horizontal direction, which facilitates electrical coupling between the upper surface of the capacitor module 52 and the high-heating component 40 and allows the cold air to better dissipate heat from the capacitor module 52. A wind gap is formed between the radiator 22 and the upper surface of the capacitor module 52. The wind velocity in the wind gap is the fastest, allowing the cold air to simultaneously remove heat from both the capacitor module 52 and the high-heating component 40. It can be seen that the capacitor module 52 is basically arranged horizontally, so the airflow can flow around the entire capacitor module 52, the heat dissipation efficiency of the capacitor module 52 is relatively high, and the capacitor module 52 can also guide the airflow to the DC electrical component 51 away from the cold air outlet 61 of the air heat exchanger 60, thereby improving the heat dissipation efficiency of the DC electrical component 51.

[0063] In this embodiment, the electrical components in the protective cavity 10B mainly dissipate heat through liquid cooling and air cooling. Among them, the high-heat-generating component 40 dissipates heat through liquid cooling, which has high heat dissipation efficiency. The low-heat-generating component 50 dissipates heat through air cooling. Since the air heat exchanger 60 and the air-liquid heat exchanger 21 both dissipate heat through external circulation, the protection of the protective cavity 10B can be well improved. It can be seen that in this embodiment, the combined heat dissipation method of liquid cooling and air cooling can maximize the heat dissipation efficiency of the high-protection components in the protective cavity 10B, and the protective cavity 10B has good protection. It is also convenient for the parallel connection of electrical cabinets or the side-by-side use in the horizontal direction, and it is also convenient to reduce the distance between power cabinets.

[0064] See also Figure 6The electrical components, including the reactor 70 and electrical connector 80, are placed within the heat dissipation cavity 10C. The reactor 70 extends vertically and is placed within the first air duct 01. The reactor 70 is located in the upper air outlet chamber 10D, primarily within the vertical section of the housing 18. A wind clearance is formed between the reactor 70 and the vertical section of the housing 18. This "wind clearance" should be understood as being solely for wind flow, and no other heating components should be placed within it. The horizontal section of the housing 18 is solely for wind flow. In other words, the reactor 70 is placed in the first zone. The reactor 70 is placed in the first air duct 01 of the heat dissipation cavity 10C. This is because the reactor 70 is relatively heavy and, therefore, is placed at the bottom of the cabinet 10 for better load-bearing properties. Furthermore, this allows the hot air discharged from the first air outlet 121 of the first air duct 01 to be as far away from the third air inlet 123 as possible. The hot air from the first air outlet 121 has a parabolic trajectory, thus preventing the hot air generated by the reactor 70 from disrupting the cold air from the third air inlet 123. The reactor 70 is located in the upper air outlet chamber 10D, separating it from the ground via the lower air outlet chamber 10F, thus protecting it from thermal radiation from the ground.

[0065] Since a wind gap is formed between the cover body 18 and the first abutment wall 13 and the second abutment wall 14, it is beneficial for the cold air flow from the second air inlet 113 to pass through the outside of the cover body 18, so that the air flow velocity increases. After the cold air flow flows to the air guide surface 161, it collides with the air guide surface 161, and the flow velocity further increases. The air flow colliding with the air guide surface 161 flows downward along the outside of the cover body 18, thereby taking away the heat radiated from the inductor 70 to the cover body 18, further improving the heat dissipation efficiency of the inductor 70; since the air guide surface 161 is spaced apart from the inner partition 17 in the vertical direction, the air flow that has not collided with the air guide surface 161 continues to flow to the second air outlet 122.

[0066] Because there is a thermal insulation gap 03 between the top surface of the cover 18 and the wall of the heat dissipation cavity 10C, this thermal insulation gap 03 cooperates with the airflow gap between the cover 18 and the air guide surface 161 to reduce the heat conduction efficiency between the cover 18 and the partition plate 16, thereby preventing the heat of the reactor 70 from radiating into the protective cavity 10B, further preventing the impact on the electrical components in the protective cavity 10B. This improves the heat dissipation efficiency of the entire cabinet 10, making it difficult for the heat of the reactor 70 to be transferred upward through thermal radiation.

[0067] The electrical connector 80 is at least partially located within the second air duct 02. It includes a fuse 81, a first connector 82, and a second connector 83. The fuse 81 is used to electrically couple with the DC electrical component 51, the first connector 82 is a DC connector, and the second connector 83 is an AC connector for the AC electrical component 53. Because the fuse 81 generates more heat than the first and second connectors 82, 83, it has lower temperature resistance than the first and second connectors 82, 83. The fuse 81 and first connector 82 are located on one side of the reactor 70 along the second direction, closer to the first sidewall 11. The second connector 83 is located on the other side of the reactor 70 along the second direction, closer to the second sidewall 12. This facilitates wiring between the first connector 82 and the DC electrical component 51, and between the second connector 83 and the AC electrical component 53, as well as the fuse 81, first connector 82, and second connector 83. The fuse 81 is located near the second air inlet 113, with the first connector 82 located below it. The first and second connectors 82, 83 extend through the inner partition 17 into the lower air outlet chamber 10F to improve heat dissipation efficiency. Accordingly, a cable hole for the DC electrical components 51 can be provided at the bottom end of the first side wall 11, and a cable hole for the AC electrical components 53 can also be provided at the bottom end of the second side wall 12.

[0068] In this embodiment, the reactor 70 is placed in the first air duct 01, and the electrical connector 80 is at least partially located in the second air duct 02. Since the first air inlet 112 and the first air outlet 121 of the first air duct 01 are respectively located at the upper end and the lower end of the heat dissipation cavity 10C, the second air inlet 113 and the second air outlet 122 are both located between the first air inlet 112 and the first air outlet 121, and the second air inlet 113 is higher than the second air outlet 122. Therefore, the first air inlet 112 is farther away from the ground than the second air inlet 113, and the air inlet temperature of the first air inlet 112 is lower than the temperature of the second air inlet 113, so that the cooler air flow can dissipate heat for the reactor 70, and the heat generated by the reactor 70 is greater than the heat generated by the electrical connector 80. Therefore, the temperature of the first air outlet 121 is higher than the temperature of the second air outlet 122. Since the first air outlet 121 is located at the lower end of the heat dissipation cavity 10C, When multiple electrical cabinets are used side by side along the first direction, the hot air from the first air outlet 121 moves upward after coming out, and its movement trajectory is basically parabolic, which is not easy to affect the first air inlet 112 and the second air inlet 113 of the downstream adjacent electrical cabinet; at the same time, the inductor 70 is placed in a separate first air duct 01, and the airflow in the first air duct 01 is greater than the airflow in the second air duct 02, so that the heat of the inductor 70 is more concentrated and can be quickly taken away, with high heat dissipation efficiency, and the heat radiation to the electrical connector 80 is small, so the heat dissipation efficiency of the electrical connector 80 is also high; wherein, the electrical connector 80 is at least partially located in the second air duct 02, and the electrical connector 80 can dissipate heat through the second air duct 02, with high heat dissipation efficiency. Since the heat generation of the electrical connector 80 is relatively low, during the heat dissipation process, the second air duct 02 can also take away the heat from the first air duct 01, thereby further improving the heat dissipation efficiency of the inductor 70. Furthermore, the reactor 70 and electrical connector 80 are located in a separate heat dissipation cavity 10C. Hot air flowing through the reactor 70 and electrical connector 80 is directly exhausted without interfering with other electrical components. Because the hot air from the first air outlet 121 is hotter and has a greater volume than the hot air from the second air outlet 122, the hot air from the second air outlet 122 can carry the hot air from the first air outlet 121 upward, further preventing any impact on downstream cabinets. It can be seen that in this embodiment, the electrical cabinets are convenient for being combined or used side by side in the horizontal direction. The reactor 70 and the electrical connector 80 are respectively arranged in the first air duct 01 and the second air duct 02. By arranging the first air inlet 112 and the first air outlet 121 at the upper and lower ends of the heat dissipation cavity 10C, the cold air temperature of the reactor 70 is low and the heat dissipation efficiency is high. At the same time, the hot air of the reactor 70, that is, the hot air from the first air outlet 121, is made as close to the ground as possible to avoid affecting the downstream electrical cabinets. In combination with the independent first air duct 01 of the reactor 70, the heat dissipation efficiency of the reactor 70 is greatly improved. The electrical connector 80 that generates less heat is placed in the second air duct 02 with a small air volume, which meets the heat dissipation requirements of the electrical connector 80 and can also assist in heat dissipation of the reactor 70.

[0069] In this embodiment, the lower air outlet chamber 10F also forms a third air outlet 132 and a fourth air outlet 142 on the first abutting wall 13 and the second abutting wall 14, which are connected to the air outlet 151 and the air flow outlet 171, so that the hot air flowing through the reactor 70 can not only flow out through the first air outlet 121, but also flow out through the third air outlet 132 and the fourth air outlet 142, thereby reducing the amount of hot air at the first air outlet 121 and not easily interfering with the first air inlet 112 and the second air inlet 113 of the downstream electrical cabinet; it should be understood that the first abutting wall 13 and the second abutting wall 14 are both suitable for use when assembling with other electrical cabinets. When multiple electrical cabinets are assembled in the second direction to form a power group, only the third air outlet 132 and the fourth air outlet 142 located on the outermost side will discharge air, and the third air outlet 132 and the fourth air outlet 142 of the electrical cabinet located in the middle will not blow air outward due to the higher wind pressure of the adjacent electrical cabinets.

[0070] After such arrangement, the hot air of the entire electrical cabinet is discharged from the top exhaust port 101 and the bottom first air outlet 121, which is not likely to cause turbulence to the air intake of the downstream electrical cabinet. In this embodiment, the high-heat generating component 40 is placed in the fourth zone, and the reactor 70 is placed in the first zone, and is arranged substantially diagonally with the reactor 70, so that the two electrical components with high heat generation are as far away as possible, further improving the heat dissipation efficiency. A liquid cooling unit is placed in the air passage cavity 10A. The liquid cooling unit may have the risk of liquid leakage. The protective cavity 10B is arranged between the air passage cavity 10A and the heat dissipation cavity 10C. Since the protective cavity 10B is relatively independent and sealed, the protective cavity 10B completely separates the air passage cavity 10A and the heat dissipation cavity 10C. Therefore, the relatively sealed protective cavity 10B improves its own protection on the one hand, preventing liquid leakage in the air passage cavity 10A from leaking into the protective cavity 10B, and on the other hand, it also acts as a partition cavity to prevent liquid leakage from leaking into the heat dissipation cavity 10C, thereby avoiding damage to electrical components. As for the leakage problem of the liquid cooling unit and the radiator 22 pipeline, it can be solved by making protective improvements to the connecting pipes. This is not within the scope of discussion in this application. The leakage problem of the liquid cooling unit discussed in this application is mainly aimed at the leakage problem of the part of the liquid cooling unit in the air chamber 10A.

[0071] The above description and embodiments are intended to explain the scope of protection of the present invention, but do not constitute a limitation thereto. Modifications, equivalent substitutions, or other improvements to the embodiments of the present invention or portions thereof that can be obtained by a person of ordinary skill in the art through logical analysis, reasoning, or limited experimentation based on the teachings of the present invention or the above embodiments, combined with common knowledge, ordinary technical knowledge in the field, and / or prior art, should all be included within the scope of protection of the present invention.

Claims

1. An electrical cabinet, comprising: The cabinet (10) is provided with an air passage cavity (10A) at its top and a heat dissipation cavity (10C) at its bottom, and a relatively closed and independent protective cavity (10B) is provided between the air passage cavity (10A) and the heat dissipation cavity (10C); the cabinet (10) is provided with a support plate (15) and a partition plate (16); the support plate (15) divides the cabinet (10) into an upper area and a lower area, the upper area forming the air passage cavity (10A); the partition plate (16) divides the lower area into a middle area and a bottom area, the middle area forming the protective cavity (10B), and the bottom area forming the heat dissipation cavity (10C); the support plate (15) extends in a horizontal direction; A high protection component is placed in the protection cavity (10B); an electrical component disposed within the heat dissipation cavity (10C); and A heat exchange device (20) includes a liquid cooling unit placed in an air passage cavity (10A) and a radiator (22) placed in a protective cavity (10B) for dissipating heat for at least part of a high-protection component. The radiator (22) is provided with a cooling liquid flow channel, and a liquid supply end and a liquid return end of the liquid cooling unit are both connected to the cooling liquid flow channel.

2. An electrical cabinet as claimed in claim 1, characterized in that: It also includes an air heat exchanger (60), the air heat exchanger (60) is provided with a cold air outlet (61) for conveying cold air to the protective cavity (10B) and a hot air outlet (62) for recovering hot air from the protective cavity (10B); the high protection component includes a high-heating element (40) and a low-heating element (50), and the radiator (22) is a liquid cooling plate and is used to dissipate heat for the high-heating element (40).

3. An electrical cabinet as claimed in claim 2, characterized in that: The hot air outlet (62) is higher than the cold air outlet (61), and the high-heat-generating element (40) is close to the hot air outlet (62) and lower than the hot air outlet (62).

4. An electrical cabinet as claimed in claim 3, characterized in that: The cabinet (10) is provided with a first side wall (11) and a second side wall (12) parallel to and opposite to each other along a first direction; the air passage cavity (10A) is provided with a main air inlet (111) on the first side wall (11), and an air outlet (101) close to the second side wall (12) is provided on the top of the cabinet (10); the cabinet (10) is provided with an air passage (151) connecting the air passage cavity (10A) and the protective cavity (10B); The liquid cooling unit comprises an air-liquid heat exchanger (21) and an air flow driving module (30), wherein the liquid supply end and the liquid return end of the air-liquid heat exchanger (21) are in communication with the cooling liquid flow channel of the radiator (22); The wind flow driving module (30) is used to drive wind to flow through the air-liquid heat exchanger (21) to the exhaust port (101); The protective cavity (10B) is provided with a third air inlet (123) on the second side wall (12), and the air heat exchanger (60) is installed on the inner surface of the second side wall (12); the air heat exchanger (60) is provided with a first air flow channel and a second air flow channel, the first air flow channel is connected to the third air inlet (123) and the air outlet (151), and the second air flow channel is provided with the cold air outlet (61) and the hot air outlet (62); the wind flow driving module (30) also drives the wind from the third air inlet (123) through the air outlet (151) to the exhaust port (101); the first air flow channel and the second air flow channel exchange heat with each other to take away the heat of the second air flow channel.

5. An electrical cabinet as claimed in claim 4, characterized in that: The low-heat-generating component (50) comprises a DC electrical component (51), an AC electrical component (53) and a capacitor module (52); the DC electrical component (51) is close to the first side wall (11); the AC electrical component (53) is placed at the bottom of the protective cavity (10B) and close to the cold air outlet (61) of the air heat exchanger (60); and the capacitor module (52) is located between the DC electrical component (51) and the AC electrical component (53) along a first direction and below the high-heat-generating component (40).

6. An electrical cabinet as claimed in claim 5, characterized in that: The lower surface of the capacitor module (52) is provided with a heat dissipation surface (521) parallel to the horizontal direction, and the upper surface of the capacitor module (52) is partially opposite to the radiator (22) and forms a wind clearance.

7. An electrical cabinet according to claim 5 or 6, characterized in that: The electrical component comprises a reactor (70) extending in a vertical direction; the upper end of the heat dissipation cavity (10C) is provided with a first air inlet (112) on a first side wall (11); the lower end of the heat dissipation cavity (10C) is provided with a first air outlet (121) on a second side wall (12); the first air outlet (121) is away from a third air inlet (123); the first air inlet (112) and the first air outlet (121) are connected to form a first air duct (01); and the reactor (70) is placed in the first air duct (01).

8. An electrical cabinet as claimed in claim 7, characterized in that: It also includes a cover (18); the cabinet (10) is provided with a partition plate (16), and the upper surface and lower surface of the partition plate (16) respectively form the cavity walls of the protection cavity (10B) and the heat dissipation cavity (10C); The cover (18) is arranged outside the reactor (70) and is connected to the first air inlet (112) and the first air outlet (121) to form the first air duct (01); a heat insulation gap (03) is present between the cover (18) and the partition plate (16).

9. An electrical cabinet as claimed in claim 8, characterized in that: The partition plate (16) enables the heat dissipation cavity (10C) to form a first zone and a second zone that are connected along the air inlet direction, the first zone being higher than the second zone, and the reactor (70) being placed in the first zone; The partition plate (16) further enables the protective cavity (10B) to form a third zone and a fourth zone that are connected along the air inlet direction, wherein the third zone and the fourth zone are respectively located above the first zone and the second zone, and the high-heat-generating component (40) is located above the fourth zone; the DC electrical component (51) is placed in the third zone, the AC electrical component (53) is placed in the fourth zone, and the capacitor module (52) spans the third zone and the fourth zone and is located between the AC electrical component (53) and the high-heat-generating component (40).

10. An electrical cabinet according to claim 8 or 9, characterized in that: The electrical component further comprises a fuse (81), a first connector (82) and a second connector (83); the fuse (81) is placed in the first area and is suitable for connecting a DC electrical component (51); the first connector (82) is located in the first area and is placed below the fuse (81); the second connector (83) is located in the second area and is placed below the AC electrical component (53); the heat dissipation cavity (10C) is further provided with a second air inlet (113) and a second air outlet (122); the second air inlet (113) and the second air outlet (122) are connected to form a second air duct (02); the first air duct (01) is at least partially located in the second air duct (02); the fuse (81), the first connector (82) and the second connector (83) are placed in the second air duct (02).

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